Light beam scanning lens and light beam scanning device

Details Light beam scanning lens and light beam scanning device Light beam scanning lens and light beam scanning device

1988-12-02

1990-06-19

Laroche, Eugene R.

350 67, 350416, 350412, G02B 2610, G02B 300

Patent

active

049347721

ABSTRACT:
A light beam scanning device has a light source, a condenser optical system, a light beam deflector, and a light beam scanning lens. The light source radiates a light beam which is converted by the condenser optical system. The convergent light beam is then deflected at a constant angular velocity by the light beam deflector. The light beam scanning lens comprises a single lens, and the convergent light beam deflected by the light beam deflector is applied to the light beam scanning lens. The light beam scanning lens places the path of movement, caused by the light beam deflector, of a naturally focused spot where the convergent light beam converged by the condenser optical system is focused, and the scanned surface in substantially conjugate relationship. The light beam scanning lens also scans the scanned surface with the light beam at an approximately constant velocity. Between the light beam scanning lens and the scanned surface, there may be disposed a correcting optical system for correcting curvature of field in an auxiliary scanning direction, or a correcting optical system for correcting curvatures of field in main and auxiliary scanning directions.

REFERENCES:
patent: 4277128 (1981-07-01), Kawamura
patent: 4352541 (1982-10-01), Mihoura et al.
patent: 4496209 (1985-01-01), Itoh et al.
patent: 4571035 (1986-02-01), Sakuma
patent: 4789230 (1988-12-01), Ohta

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