Electrophotographic image forming apparatus including air conditioning means for removing harmful substances

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• exposing means disposed in said image forming unit for forming a latent image on said photoconductive element;
• and
• a pair of seal members positioned at opposite ends of said opening in a direction of length adapted to seal clearances between said opening and said photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form the latent image on said photoconductive element;
• a transparent member covering said slit;
• a path configured such that air outside of said image forming unit is allowed into said image forming unit and then discharged to the outside, wherein said air conditioning means is positioned at an inlet side of said path;
• and
• non-contact type developing means facing and out of contact with said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element, wherein an outlet side of said path coincides with a development gap formed by said non-contact type developing means.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form the latent image on said photoconductive element;
• a transparent member covering said slit;
• exposing means disposed in said image forming unit for forming a latent image on said photoconductive element;
• a path configured such that air outside said image forming unit flows into said image forming unit and then flows out to the outside, wherein said air conditioning means is positioned at an inlet side of said path;
• and
• non-contact type developing means facing, and out of contact with said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element, wherein an outlet side of said path coincides with a development gap formed by said non-contact type developing means.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form the latent image on said photoconductive element;
• a transparent member covering said slit;
• and
• a pair of seal members positioned at opposite ends of said opening in a direction of length adapted to seal clearances between said opening and said photoconductive element.

An image forming comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form the latent image on said photoconductive element;
• and
• a transparent member covering said slit,
• wherein said air conditioning means is disposed in said image forming unit.

An image forming comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form the latent image on said photoconductive element;
• and
• a transparent member covering said slit,
• wherein said air conditioning means accommodates an optical catalyst thereinside.

An image forming comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form the latent image on said photoconductive element;
• and
• a transparent member covering said slit,
• wherein said air conditioning means accommodates dehumidifying means thereinside.

An image forming comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form the latent image on said photoconductive element;
• and
• a transparent member covering said slit,
• wherein said air conditioning means accommodates an ion adsorbing material thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form a latent image on said photoconductive element;
• closing means for closing said slit with a transparent member when said image forming unit is mounted to said casing;
• a path configured such that air outside of said image forming unit is allowed into said image forming unit and then discharged to the outside, wherein said air conditioning means is positioned at an inlet side of said path;
• and
• non-contact type developing means facing and out of contact with said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element, wherein an outlet side of said path coincides with a development gap formed by said non-contact type developing means.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form a latent image on said photoconductive element;
• closing means for closing said slit with a transparent member when said image forming unit is mounted to said casing;
• exposing means disposed in said image forming unit for forming a latent image on said photoconductive element;
• a path configured such that air outside said image forming unit flows into said image forming unit and then flows out to the outside, wherein said air conditioning means is positioned at an inlet side of said path;
• and
• non-contact type developing means facing and out of contact with said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element, wherein an outlet side of said path coincides with a development gap formed by said non-contact type developing means.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form a latent image on said photoconductive element;
• closing means for closing said slit with a transparent member when said image forming unit is mounted to said casing;
• and
• a pair of seal members positioned at opposite ends of said opening in a direction of length configured to seal clearances between said opening and said photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form a latent image on said photoconductive element;
• and
• closing means for closing said slit with a transparent member when said image forming unit is mounted to said casing,
• wherein said air conditioning means is disposed in said image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form a latent image on said photoconductive element;
• and
• closing means for closing said slit with a transparent member when said image forming unit is mounted to said casing,
• wherein said air conditioning means accommodates an optical catalyst thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form a latent image on said photoconductive element;
• and
• closing means for closing said slit with a transparent member when said image forming unit is mounted to said casing,
• wherein said air conditioning means accommodates dehumidifying means thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a slit formed in said case of said image forming unit configured to pass a light beam to form a latent image on said photoconductive element;
• and
• closing means for closing said slit with a transparent member when said image forming unit is mounted to said casing,
• wherein said air conditioning means accommodates an ion adsorbing material thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a path configured such that air outside said image forming unit flows into said image forming unit and then flows out to the outside, wherein said air conditioning means is positioned at an inlet side of said path;
• and
• a pair of seal members positioned at opposite ends of said opening in a direction of length configured to seal clearances between said opening and said photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• a circulation path configured such that air inside said image forming unit is discharged from said image forming unit and again introduced into said image forming unit, wherein said air conditioning means is positioned on said circulation path and
• a pair of seal members positioned at opposite ends of said opening in a direction of length configured to seal clearances between said opening and said photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• contact type developing means contacting said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element;
• and
• a pair of seal members positioned at opposite ends of said opening in a direction of length configured to seal clearances between said opening and said photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• and
• contact type developing means contacting said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element,
• wherein said air conditioning means is disposed in said image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• and
• contact type developing means contacting said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element,
• wherein said air conditioning means accommodates an optical catalyst thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• and
• contact type developing means contacting said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element,
• wherein said air conditioning means accommodates dehumidifying means thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• and
• contact type developing means contacting said photoconductive element at an upstream side of said opening in a direction of rotation of said photoconductive element,
• wherein said air conditioning means accommodates an ion adsorbing material thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• contact type cleaning means contacting said photoconductive element at a downstream side of said opening in a direction of rotation of said photoconductive element;
• and
• a pair of seal members positioned at opposite ends of said opening in a direction of length configured to seal clearances between said opening and said photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• and
• contact type cleaning means contacting said photoconductive element at a downstream side of said opening in a direction of rotation of said photoconductive element,
• wherein said air conditioning means is disposed in said image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside;
• and
• a pair of seal members positioned at opposite ends of said opening in a direction of length configured to seal clearances between said opening and said photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• and
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside,
• wherein said air conditioning means is disposed in said image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which said photoconductive element is partly exposed to an outside, wherein said opening is an only opening allowing substances harmful to image formation into said case when said image forming unit is mounted to said casing;
• and
• air conditioning means for removing the harmful substances flowing into said image forming unit from the outside,
• wherein said air conditioning means is disposed in said image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case and a photoconductive element disposed in an opening of the case;
• an air conditioning device configured to remove harmful substances flowing into the image forming unit from outside of the case;
• and
• a seal member disposed around the opening of the case, the seal member configured to prevent a flow of air between an interior of the case and the outside of the case.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• an exposing device disposed in the image forming unit configured to form a latent image on the photoconductive element;
• and
• a pair of seal members positioned at opposite ends of the opening in a direction of length adapted to seal clearances between the opening and the photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming unit configured to pass a light beam to form the latent image on the photoconductive element;
• a transparent member covering the slit;
• a path configured such that air outside of the image forming unit is allowed into the image forming unit and then discharged to the outside, wherein the air conditioning device is positioned at an inlet side of the path;
• and
• a non-contact type developing device facing and out of contact with the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element, wherein an outlet side of the path coincides with a development gap formed by the non-contact type developing device.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming unit configured to pass a light beam to form the latent image on the photoconductive element;
• a transparent member covering the slit;
• an exposing device disposed in the image forming unit configured to form a latent image on the photoconductive element;
• a path configured such that air outside the image forming unit flows into the image forming unit and then flows out to the outside, wherein the air conditioning device is positioned at an inlet side of the path;
• and
• a non-contact type developing device facing and out of contact with the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element, wherein an outlet side of the path coincides with a development gap formed by the non-contact type developing device.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming unit configured to pass a light beam to form the latent image on the photoconductive element;
• a transparent member covering the slit;
• and
• a pair of seal members positioned at opposite ends of the opening in a direction of length adapted to seal clearances between the opening and the photoconductive element.

An image forming comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming unit configured to pass a light beam to form the latent image on the photoconductive element;
• and
• a transparent member covering the slit,
• wherein the air conditioning device is disposed in the image forming unit.

An image forming comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming unit configured to pass a light beam to form the latent image on the photoconductive element;
• and
• a transparent member covering the slit,
• wherein the air conditioning device accommodates an optical catalyst thereinside.

An image forming comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming unit configured to pass a light beam to form the latent image on the photoconductive element;
• and
• a transparent member covering the slit,
• wherein the air conditioning device accommodates a dehumidifying device thereinside.

An image forming comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming unit configured to pass a light beam to form the latent image on the photoconductive element;
• and
• a transparent member covering the slit,
• wherein the air conditioning device accommodates an ion adsorbing material thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming device configured to pass a light beam to form a latent image on the photoconductive element;
• a closing device configured to close the slit with a transparent member when the image forming unit is mounted to the casing;
• a path configured such that air outside of the image forming unit is allowed into the image forming unit and then discharged to the outside, wherein the air conditioning device is positioned at an inlet side of the path;
• and
• a non-contact type developing device facing and out of contact with the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element, wherein an outlet side of the path coincides with a development gap formed by the non-contact type developing device.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming unit configured to pass a light beam to form a latent image on the photoconductive element;
• a closing device configured to close the slit with a transparent member when the image forming unit is mounted to the casing;
• an exposing device disposed in the image forming unit configured to form a latent image on the photoconductive element;
• a path configured such that air outside the image forming unit flows into the image forming unit and then flows out to the outside, wherein the air conditioning device is positioned at an inlet side of the path;
• and
• a non-contact type developing device facing and out of contact with the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element, wherein an outlet side of the path coincides with a development gap formed by the non-contact type developing device.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming device configured to pass a light beam to form a latent image on the photoconductive element;
• a closing device configured to close the slit with a transparent member when the image forming unit is mounted to the casing;
• and
• a pair of seal members positioned at opposite ends of the opening in a direction of length configured to seal clearances between the opening and the photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming device configured to pass a light beam to form a latent image on the photoconductive element;
• and
• a closing device configured to close the slit with a transparent member when the image forming unit is mounted to the casing,
• wherein the air conditioning device is disposed in the image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming device configured to pass a light beam to form a latent image on the photoconductive element;
• and
• a closing device configured to close the slit with a transparent member when the image forming unit is mounted to the casing,
• wherein the air conditioning device accommodates an optical catalyst thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming device configured to pass a light beam to form a latent image on the photoconductive element;
• and
• a closing device configured to close the slit with a transparent member when the image forming unit is mounted to the casing,
• wherein the air conditioning device accommodates dehumidifying device thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a slit formed in the case of the image forming device configured to pass a light beam to form a latent image on the photoconductive element;
• and
• a closing device configured to close the slit with a transparent member when the image forming unit is mounted to the casing,
• wherein the air conditioning device accommodates an ion adsorbing material thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a path configured such that air outside the image forming unit flows into the image forming unit and then flows out to the outside, wherein the air conditioning device is positioned at an inlet side of the path;
• and
• a pair of seal members positioned at opposite ends of the opening in a direction of length configured to seal clearances between the opening and the photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a circulation path configured such that air inside the image forming unit is discharged from the image forming unit and again introduced into the image forming unit, wherein the air conditioning device is positioned on the circulation path;
• and
• a pair of seal members positioned at opposite ends of the opening in a direction of length configured to seal clearances between the opening and the photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a contact type developing device contacting the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element;
• and
• a pair of seal members positioned at opposite ends of the opening in a direction of length configured to seal clearances between the opening and the photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• and
• a contact type developing device contacting the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element,
• wherein the air conditioning device is disposed in the image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• and
• a contact type developing device contacting the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element,
• wherein the air conditioning device accommodates an optical catalyst thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• and
• a contact type developing device contacting the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element,
• wherein the air conditioning device accommodates dehumidifying device thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• and
• a contact type developing device contacting the photoconductive element at an upstream side of the opening in a direction of rotation of the photoconductive element,
• wherein the air conditioning device accommodates an ion adsorbing material thereinside.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• a contact type cleaning device contacting the photoconductive element at a downstream side of the opening in a direction of rotation of the photoconductive element;
• and
• a pair of seal members positioned at opposite ends of the opening in a direction of length configured to seal clearances between the opening and the photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• and
• a contact type cleaning device contacting the photoconductive element at a downstream side of the opening in a direction of rotation of the photoconductive element,
• wherein the air conditioning device is disposed in the image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside;
• and
• a pair of seal members positioned at opposite ends of the opening in a direction of length configured to seal clearances between the opening and the photoconductive element.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• and
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside,
• wherein the air conditioning device is disposed in the image forming unit.

An image forming apparatus comprising:

• a casing;
• an image forming unit comprising a case accommodating at least a photoconductive element therein and formed with an opening for image transfer via which the photoconductive element is partly exposed to an outside, wherein the opening is an only opening allowing substances harmful to image formation into the case when the image forming unit is mounted to the casing;
• and
• an air conditioning device configured to remove the harmful substances flowing into the image forming unit from the outside,
• wherein the air conditioning device is disposed in the image forming unit.