Light scanning device

Details Light scanning device Light scanning device

1988-06-16

1989-08-22

Arnold, Bruce Y.

G02B 2610

Patent

active

048590118

ABSTRACT:
A light scanning device includes a light source unit, a first focusing optical system for focusing a light beam from the light source unit as a linear image in a position, a rotating polygon having a reflecting surface near the position for deflecting the light beam at a constant angular velocity, and a second focusing optical system for focusing the light beam deflected by the rotating polygon as a spot on a surface being scanned. The second focusing optical system includes a lens having a toric surface and coupling the reflecting surface and the scanned surface in substantially conjugate relationship with respect to an auxiliary scanning direction. The axis of the deflected light beam and the optical axis of the second focusing optical system deviate by .DELTA. from each other in a light deflecting plane, where the deflected light beam is parallel to the optical axis of the second focusing optical system, with the second focusing optical system having a focal length fM in the light deflecting plane, the amount of deviation .DELTA. being in the range: 0.0066 fM<.DELTA.<0.0076 fM.

REFERENCES:
patent: 4269478 (1981-05-01), Maeda et al.
patent: 4707085 (1987-11-01), Takanashi et al.
patent: 4712884 (1987-12-01), Sakuma et al.
patent: 4756583 (1988-07-01), Morimoto
patent: 4756584 (1988-07-01), Takanashi
patent: 4770517 (1988-09-01), Sakuma

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