Optical scanning device, method of adjusting optical scanning device, and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsMitsuo SUZUKI, Kohji SAKAI
Life of this patent
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Abstract
An optical scanning device includes: a light source that emits a laser beam modulated and driven according to an image forming signal; a scanning optical system that includes a polygon mirror to scan a surface of a photoconductor with the laser beam from the light source; a surface identifying unit that associates a sub-scanning position by the polygon mirror with each surface of the polygon mirror; and a light-amount adjusting unit that adjusts a light amount of the light source according to the sub-scanning position, for each surface of the polygon mirror.
Claims9
An optical scanning device comprising:
- a light source that emits a laser beam modulated and driven according to an image forming signal;
- a scanning optical system that includes a polygon mirror to scan a surface of a photoconductor with the laser beam from the light source;
- a surface identifying unit that associates a sub-scanning position by the polygon mirror with each surface of the polygon mirror;
- and
- a light-amount adjusting unit that adjusts a light amount of the light source according to the sub-scanning position, for each surface of the polygon mirror.
A light-amount adjusting method of an optical scanning device that includes a light source emitting a laser beam modulated and driven according to an image forming signal, and a scanning optical system including a polygon mirror to scan a surface of a photoconductor with a laser beam from the light source, the method comprising:
- associating a sub-scanning position by the polygon mirror with each surface of the polygon mirror;
- and
- adjusting a light amount of the light source according to the sub-scanning position for each surface of the polygon mirror.
A light-amount adjusting method of an optical scanning device that includes a light source emitting a laser beam modulated and driven according to an image forming signal, and a scanning optical system including a polygon mirror to scan a surface of a photoconductor with a laser beam from the light source, the method comprising:
- detecting a sub-scanning position by the polygon mirror;
- associating the sub-scanning position detected at the detecting with a surface of the polygon mirror;
- storing sub-scanning positions of a surface of the polygon mirror by grouping in a predetermined range, as a sub-scanning position group;
- and
- adjusting a light amount of the light source for each surface of the polygon mirror according to the sub-scanning position group.
Dependencies are inferred from the claim text.