Lens for facsimile or laser printer

Details Lens for facsimile or laser printer Lens for facsimile or laser printer

1986-11-06

1988-07-05

Corbin, John K.

350 61, 350 68, G02B 960, G02B 2608

Patent

active

047550309

ABSTRACT:
An f.multidot..theta. lens system for use in an apparatus such as a facsimile, machine laser printer, and the like for scanning and recording by a laser beam. The lens system minimizes the amount of image distorted in the sagittal direction and provides equal angular scanning velocity, high brightness and high resolution. The lens system comprises five serially disposed lenses the first of which is a positive meniscus lens whose concave surface is directed toward the incident side of a laser beam, the second lens is a negative meniscus lens whose concave surface is directed toward the incident side of the laser beam, and the third to fifth lenses a positive meniscus lenses whose concave surfaces are directed toward the beam incident side, wherein these lenses satisfy particular conditions relating to the radii of curvatures of their surfaces, lens thickness, refractive indices and lens-to-lens distances.

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