| 摘要 |
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.
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