Illumination device, document reading device, adjusting device, and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsYasuo Sakurai, Masashi Kohchi
Life of this patent
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Abstract
An illumination device for a reading device which irradiates light over a predetermined illumination width including a reading area having a predetermined reading width extending in a main scanning direction of a document and reads the light reflected from the document using a reading element has a point light source, and a light-guiding member having an incident surface opposed to a light-emitting surface of the point light source and a light-emitting surface opposed to the reading area. An illumination area generated by the light has a high distribution range of a substantially constant illuminance, and the high distribution range coincides substantially with the reading area.
Claims20
An illumination device, which is used in a document-reading device configured to irradiate light over at least a predetermined illumination width including a reading area having a predetermined reading width extending in a main scanning direction of a document and to read the light reflected from the document using an image-reading element, the illumination device comprising:
- a point light source;
- a light-guiding member having an incident surface opposed to a light-emitting surface of the point light source and a light-emitting surface opposed to the reading area;
- a carriage configured to shift an illumination area in a sub-scanning direction;
- and
- a support base configured to support and hold the point light source and the light-guiding member together as a unit, and to be attached to the carriage adjustably in the sub-scanning direction,
- wherein an illumination area generated by the light irradiated from the point light source has a high illuminance distribution range of a substantially constant illuminance, and the high illuminance distribution range coincides substantially with the reading area.
An illumination device, which is used in a document-reading device configured to irradiate light over at least a predetermined illumination width including a reading area having a predetermined reading width extending in a main scanning direction of a document and to read the light reflected from the document using an image-reading element, the illumination device comprising:
- a plurality of point light sources;
- a point light source substrate including the plurality of point light sources aligned in the main scanning direction;
- a light-guiding member having an incident surface opposed to a light-emitting surface of the point light source substrate and a light-emitting surface opposed to the reading area;
- a carriage configured to shift an illumination area in a sub-scanning direction;
- and
- a support base configured to hold the point light source substrate and the light-guiding member, and to be attached to the carriage adjustably in the sub-scanning direction.
An illumination device, which is used in a document-reading device configured to irradiate light over at least a predetermined illumination width including a reading area having a predetermined reading width extending in a main scanning direction of a document and to read the light reflected from the document using an image- reading element, the illumination device comprising:
- a point light source;
- a light-guiding member having an incident surface opposed to a light-emitting surface of the point light source and a light-emitting surface opposed to the reading area;
- a carriage configured to shift an illumination area in a sub-scanning direction;
- and
- a support base configured to support and hold the point light source and the light-guiding member together as a unit, and to be attached to the carriage adjustably in the sub-scanning direction.
Dependencies are inferred from the claim text.