Exposing device, controlling method thereof, and storage medium storing program for controller of exposing device

An exposing device comprising:

• a light emitting head having a plurality of chips arranged in a main scanning direction, the plurality of chips including a first chip and a second chip closest to the first chip, each of the plurality of chips having a plurality of light emitting elements arranged in the main scanning direction, the plurality of light emitting elements emitting light to a photosensitive surface, each of the plurality of chips having an end region and a middle region, the end region being a region having at least one of the plurality of light emitting elements close to an adjacent chip, the middle region being a region having the plurality of light emitting elements other than the at least one of the plurality of light emitting elements in the end region;
• and
• a controller connected to the light emitting head,
• wherein:
• the controller is configured to operate the light emitting head to form a halftone electrostatic latent image on the photosensitive surface by emitting light from the plurality of light emitting elements, the halftone electrostatic latent image being an image made by hatching having oblique lines inclined relative to the main scanning direction;
• and
• when an interval between the first chip and the second chip in the main scanning direction is smaller than a second particular value, the controller is configured to control the plurality of light emitting elements to emit light such that a light amount of a first light emitting element and a light amount of a second light emitting element are smaller than light amounts of light emitting elements in the middle region and that the light amount of the second light emitting element is larger than the light amount of the first light emitting element, the first light emitting element being a light emitting element provided on the first chip and closest to the second chip, the second light emitting element being a light emitting element provided on the second chip and closest to the first chip, the first light emitting element being in the end region of the first chip, the second light emitting element being in the end region of the second chip.

A method of controlling an exposing device including a light emitting head having a plurality of chips arranged in a main scanning direction, the plurality of chips including a first chip and a second chip closest to the first chip, each of the plurality of chips having a plurality of light emitting elements arranged in the main scanning direction, the plurality of light emitting elements emitting light to a photosensitive surface, each of the plurality of chips having an end region and a middle region, the end region being a region having at least one of the plurality of light emitting elements close to an adjacent chip, the middle region being a region having the plurality of light emitting elements other than the at least one of the plurality of light emitting elements in the end region, the method comprising:

• operating the light emitting head to form a halftone electrostatic latent image on the photosensitive surface by emitting light from the plurality of light emitting elements, the halftone electrostatic latent image being an image made by hatching having oblique lines inclined relative to the main scanning direction, the operating the light emitting head comprising:
• when an interval between the first chip and the second chip in the main scanning direction is larger than a first particular value, controlling the plurality of light emitting elements to emit light such that a light amount of a first light emitting element and a light amount of a second light emitting element are larger than light amounts of light emitting elements in the middle region and that the light amount of the second light emitting element is smaller than the light amount of the first light emitting element, the first light emitting element being a light emitting element provided on the first chip and closest to the second chip, the second light emitting element being a light emitting element provided on the second chip and closest to the first chip, the first light emitting element being in the end region of the first chip, the second light emitting element being in the end region of the second chip.

A non-transitory computer-readable storage medium storing instructions executable by a controller of an exposing device, the exposing device including a light emitting head having a plurality of chips arranged in a main scanning direction, the plurality of chips including a first chip and a second chip closest to the first chip, each of the plurality of chips having a plurality of light emitting elements arranged in the main scanning direction, the plurality of light emitting elements emitting light to a photosensitive surface, each of the plurality of chips having an end region and a middle region, the end region being a region having at least one of the plurality of light emitting elements close to an adjacent chip, the middle region being a region having the plurality of light emitting elements other than the at least one of the plurality of light emitting elements in the end region, the instructions, when executed by the controller, causing the exposing device to perform:

• operating the light emitting head to form a halftone electrostatic latent image on the photosensitive surface by emitting light from the plurality of light emitting elements, the halftone electrostatic latent image being an image made by hatching having oblique lines inclined relative to the main scanning direction, the operating the light emitting head comprising:
• when an interval between the first chip and the second chip in the main scanning direction is larger than a first particular value, controlling the plurality of light emitting elements to emit light such that a light amount of a first light emitting element and a light amount of a second light emitting element are larger than light amounts of light emitting elements in the middle region and that the light amount of the second light emitting element is smaller than the light amount of the first light emitting element, the first light emitting element being a light emitting element provided on the first chip and closest to the second chip, the second light emitting element being a light emitting element provided on the second chip and closest to the first chip, the first light emitting element being in the end region of the first chip, the second light emitting element being in the end region of the second chip.