Optical scanning device

Details Optical scanning device Optical scanning device

1991-03-22

1992-05-19

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359197, 359668, 359742, G02B 2608, G02B 1308, G02B 308

Patent

active

051153343

ABSTRACT:
An optical scanning device comprising a light source which emits a luminous flux for irradiating a scanning surface and comprises a semiconductor laser element and an anamorphic ellipsoidal Fresnel lens. The device further comprises a rotary polygon mirror having reflection surfaces for deflecting the luminous flux emitted from the light source. The device further comprises an image forming optical system disposed between the polygon mirror and the scanning surface for forming an optical spot image from the luminous flux on the scanning surface. The optical spot is arranged to scan the scanning surface in a horizontal scanning direction and a vertical scanning direction. The optical system is so arranged that the reflection surface and the scanning surface are positioned at conjugate points with respect to each other for the luminous flux with regard to the vertical scanning direction.

REFERENCES:
patent: 4563056 (1986-01-01), Tagawa et al.
patent: 4915484 (1990-04-01), Yamamoto

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