Image-forming apparatus

An image forming apparatus including a photosensitive member, and a light-irradiation unit configured to form a latent image on the photosensitive member by scanning, with laser light, a plurality of sections in a main scanning direction at a non-constant scanning velocity, the image forming apparatus comprising:

• an image data changing unit configured to extract pixel piece smaller in size than one pixel from image data or insert the pixel piece into the image data according to which of the sections in the main scanning direction data corresponds to among image data for scanning with the laser light;
• and
• a brightness changing unit configured to change an emission brightness of the laser light according to which of the sections in the main scanning direction the laser light corresponds to,
• wherein, in a plurality of sections in the main scanning direction, the image data changing unit extracts or inserts the pixel piece from or into image data corresponding to the plurality of sections and the brightness changing unit changes an emission brightness of laser light corresponding to the plurality of sections.

An image forming apparatus including a photosensitive member, and a light-irradiation unit configured to form a latent image on the photosensitive member by scanning, with laser light, a plurality of sections in a main scanning direction without transmitting the laser light through a lens having an fθ characteristic, the image forming apparatus comprising:

• an image data changing unit configured to extract pixel piece smaller in size than one pixel from image data or insert the pixel piece into the image data according to which of the sections in the main scanning direction data corresponds to among image data for scanning with the laser light;
• and
• a brightness changing unit configured to change an emission brightness of the laser light according to which of the sections in the main scanning direction the laser light corresponds to,
• wherein, in a plurality of sections in the main scanning direction, the image data changing unit extracts or inserts the pixel piece from or into image data corresponding to the plurality of sections and the brightness changing unit changes an emission brightness of laser light corresponding to the plurality of sections.

An image forming apparatus including a photosensitive member, and a light-irradiation unit configured to form a latent image on the photosensitive member by scanning, with laser light, a plurality of sections in a main scanning direction at a non-constant scanning velocity according to image data indicating a density of an image, the image forming apparatus comprising:

• a pixel width correcting unit configured to extract a pixel piece smaller in size than one pixel from the image data or insert the pixel piece into the image data according to which of the sections in the main scanning direction data corresponds to among image data for scanning with the laser light;
• and
• a density correcting unit configured to change a density of the image data according to which of the sections in the main scanning direction data corresponds to among the image data,
• wherein, in a first section in the main scanning direction, a number of pixel pieces corresponding to the first section is changed to a first number and a density of image data corresponding to the first section is changed to a first density,
• wherein, in a second section, in which a scanning velocity is faster than a scanning velocity in the first section, in the main scanning direction, a number of pixel pieces corresponding to the second section is changed to a second number and a density of image data corresponding to the second section is changed to a second density, and
• wherein the second number is smaller than the first number, and the second density is higher than the first density.

An image forming apparatus including a photosensitive member, and a light-irradiation unit configured to form a latent image on the photosensitive member by scanning, with laser light, a plurality of positions in a main scanning direction at a non-constant scanning velocity according to image data indicating a density of an image, the image forming apparatus comprising:

• a pixel width correcting unit configured to extract a pixel piece smaller in size than one pixel from the image data or insert the pixel piece into the image data according to a position in the main scanning direction;
• and
• a density correcting unit configured to change image data to change a density according to which of the positions in the main scanning direction data corresponds to among the image data, and
• wherein, at a first position in the main scanning direction, a number of pixel pieces corresponding to the first position is changed to a first number and a density of image data corresponding to the first position is changed to a first density,
• wherein, at a second position, at which a scanning velocity is faster than a scanning velocity at the first position, in the main scanning direction, a number of pixel pieces corresponding to the second position is changed to a second number and a density of image data corresponding to the second position is changed to a second density, and
• wherein the second number is smaller than the first number, and the second density is higher than the first density.

An image forming apparatus including a photosensitive member, and a light-irradiation unit configured to form a latent image on the photosensitive member by scanning, with laser light, a plurality of positions in a main scanning direction at a non-constant scanning velocity according to image data indicating a density of an image, the image forming apparatus comprising:

• a pixel width correcting unit configured to extract a pixel piece smaller in size than one pixel from the image data or insert the pixel piece into the image data according to a position in the main scanning direction,
• wherein, in a case where a density of image data at a first position in the main scanning direction is a first density and a density of image data at a second position, at which a scanning velocity is faster than a scanning velocity at the first position, in the main scanning direction is a second density equal to the first density,
• at the first position, a number of pixel pieces corresponding to the first position is changed to a first number, and at the second position, a number of pixel pieces corresponding to the second position is changed to a second number, and
• wherein the second number is smaller than the first number, the first density becomes a third density, and the second density becomes a fourth density higher than the third density.

An image forming apparatus including a photosensitive member, and a light-irradiation unit configured to form a latent image on the photosensitive member by scanning, with laser light, a plurality of positions in a main scanning direction at a non-constant scanning velocity according to image data indicating an image density of an image, the image forming apparatus comprising:

• a pixel width correcting unit configured to extract a pixel piece smaller in size than one pixel from the image data or insert the pixel piece into the image data according to a position in the main scanning direction,
• wherein, in a case where image data at a first position in the main scanning direction has a first density and image data at a second position, in the main scanning direction, to be scanned at a scanning velocity higher than a scanning velocity at the first position has a second density equal to the first density,
• a number of pixel pieces of one pixel corresponding to the first position is changed to a first number at the first position, a number of pixel pieces of one pixel corresponding to the second position is changed to a second number at the second position, the second number is smaller than the first number, and
• a first exposure amount of the laser light emitted to the first position on the photosensitive member is equal to a second exposure amount of the laser light emitted to the second position on the photosensitive member.