Collimated light beam scanning method including curvature of fie

Details Collimated light beam scanning method including curvature of fie Collimated light beam scanning method including curvature of fie

1988-06-24

1990-03-06

Arnold, Bruce Y.

350486, G02B 2610, G02B 2608

Patent

active

049060619

ABSTRACT:
A laser beam from a laser beam source is applied via a collimator lens to a rotating light deflector, deflected by the light deflector, and applied via an f.theta. lens to a surface to scan the same.
The f.theta. lens comprises a single-element lens with its f.theta. characteristics well corrected.
To correct the curvature of field by the f.theta. lens, the collimator lens is vibrated in simple harmonic motion along the optical axis thereof, or the laser beam source is vibrated in simple harmonic motion along the optical axis of the collimator lens, in synchronism with the scanning of the surface with the laser beam.

REFERENCES:
patent: 3720454 (1973-03-01), Inderhees
patent: 4707126 (1971-03-01), Ohshima et al.
patent: 4744071 (1988-05-01), Bricot et al.

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