Optical scanner having an image forming mirror and means for red

Details Optical scanner having an image forming mirror and means for red Optical scanner having an image forming mirror and means for red

1993-07-21

1995-04-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359208, G02B 2610

Patent

active

054080959

ABSTRACT:
In an optical scanner, a light source emits a light beam and a coupling lens changes this light beam to a convergent, divergent or parallel light beam. An optical deflector deflects the light beam from the coupling lens at an equal angular velocity. The deflected light beam is converged onto a scanned face by an image forming mirror and an elongated cylindrical optical element to perform an optical scanning operation at an equal speed. An optical path separating device separates an optical path of light reflected on the image forming mirror from an optical path of incident light from the light source to the image forming mirror. A reflecting face of the image forming mirror is constructed by a coaxial aspherical surface. The elongated cylindrical optical element has positive refracting power only in a direction perpendicular to a longitudinal direction thereof and is arranged between the image forming mirror and the scanned face in a state in which this longitudinal direction is parallel to a main scan-corresponding direction. In this optical scanner, a change in diameter of a light spot caused by field curvature is effectively reduced.

REFERENCES:
patent: 4984858 (1991-01-01), Kuroda
patent: 5157534 (1992-10-01), Endou et al.
patent: 5170278 (1992-12-01), Wada et al.
patent: 5220449 (1993-06-01), Kuroda
patent: 5233454 (1993-08-01), Sakuma et al.

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