Image forming apparatus including a plural laser beam scanning a

Details Image forming apparatus including a plural laser beam scanning a Image forming apparatus including a plural laser beam scanning a

1992-12-18

1997-03-11

Fuller, Benjamin R.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347243, 347244, 359204, 359216, G03G 1304, B41J 2435, G02B 2610

Patent

active

056106475

ABSTRACT:
An image forming apparatus including an image bearing member, a charging unit, a laser beam scanning apparatus and a developing unit. The laser beam scanning apparatus includes a semiconductor laser array for emitting laser beams, a collimator lens for collimating the beams, a rotating polygon mirror for deflecting the beams collimated by the lens, and an aperture stop between the laser array and the mirror. The following relations between the aforementioned elements of the apparatus are satisfied: ##EQU1## where f is a focal length of the collimator lens; s is a distance between a focal point on a mirror side of the collimator lens and the aperture stop; t is a distance between one of the light emitting portions that is spaced farthest, relative to others of the light emitting portions, from the optical axis; D is a diameter of the aperture stop, and d is a diameter of each of the laser beams collimated by the collimator lens.

REFERENCES:
patent: 4253102 (1981-02-01), Kataoka et al.
patent: 4800401 (1989-01-01), Sato et al.
patent: 4999648 (1991-03-01), Debesis
patent: 5182757 (1993-01-01), Mori et al.
patent: 5264869 (1993-11-01), Appel et al.

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