Optical scanning device used in a tandem system color image forming apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorToshihito Tanaka
Life of this patent
Estimating the term…
Abstract
The optical scanning device includes a deflector 22 for deflecting plural laser beams in batch, first and second fθ lenses 24, 25 for converting the laser beams from the deflector 22 into uniform speed linear motion, reflection mirrors 23a to 23g for reflecting the laser beams from the first and second fθ lenses 24, 25, photoreceptor drums 2a, 2b, 2c, 2d on which latent images are formed by laser beams, and third fθ lenses 26a to 26d for focusing the laser beams reflected by the reflection mirrors 23a to 23g and guiding onto the photoreceptor drums 2a, 2b, 2c, 2d. The laser beam 9a reflected by the reflection mirror 23 remotest from the deflector 23 is the laser beam for forming a yellow image.
Claims10
An optical scanning device comprising:
- a deflector for deflecting in batch a plurality of laser beams entered as being arrayed in a vertical direction to the plane of deflection;
- a converting optical unit for converting equiangular speed motion of the plurality of laser beams deflected by the deflector in batch into uniform speed linear motion;
- a plurality of reflection mirrors for reflecting the plurality of laser beams converted by said converting optical unit;
- a plurality of focusing optical units for focusing the plural laser beams reflected by said plurality of reflection mirrors;
- and
- a plurality of photoreceptors for forming an electrostatic latent image by the plurality of laser beams focused by said plurality of focusing optical units, each of said plurality of photoreceptors being arranged in a sub scanning direction to each of the plurality of laser beams from said plurality of focusing optical units,
- wherein interval of the plurality of laser beams deflected from said deflector is an uneven pitch, and interval ratio corresponds to layout distance ratio of said plurality of reflection mirrors.
An optical scanning device comprising:
- a deflector for deflecting in batch a plurality of laser beams entered as being arrayed in a vertical direction to the plane of deflection;
- a converting optical unit for converting equiangular speed motion of the plurality of laser beams deflected by the deflector in batch into uniform speed linear motion;
- a plurality of reflection mirrors for reflecting the plurality of laser beams converted by said converting optical unit;
- a plurality of focusing optical units for focusing the plural laser beams reflected by said plurality of reflection mirrors;
- and
- a plurality of photoreceptors for forming an electrostatic latent image by the plurality of laser beams focused by said plurality of focusing optical units, each of said plurality of photoreceptors being arranged in a sub scanning direction to each of the plurality of laser beams from said plurality of focusing optical units,
- wherein a yellow image is formed by a laser beam reflected by a remotest reflection mirror from said deflector, among said plurality of reflection mirrors,
- wherein beam diameter of a laser beam emitted to a photoreceptor at the remotest position from said deflector is larger than beam diameter of other laser beams, of the plurality of laser beams focused by said plurality of focusing optical units.
Dependencies are inferred from the claim text.