Optical scanning apparatus with optical correction for scan mirr

Details Optical scanning apparatus with optical correction for scan mirr Optical scanning apparatus with optical correction for scan mirr

1988-04-08

1989-11-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 68, H01J 314

Patent

active

048824836

ABSTRACT:
In an optical scanning apparatus, a scanning lens is composed of three lens elements. The centrally located lens element of the scanning lens has a refractive power in the direction for correcting the surface tilt, that is, an inverted number of a focal length that is changed in accordance with the scanning view angle, whereby curvature of field is well corrected and RMS spot diameters on the scanning surface may be small. In addition, even if the view angle is increased, imaging characteristics may be kept at a high resolving power.

REFERENCES:
patent: 4756583 (1988-07-01), Morimoto
patent: 4756584 (1988-07-01), Takanashi

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