Scanning image-forming lens system and optical scanner

Details Scanning image-forming lens system and optical scanner Scanning image-forming lens system and optical scanner

1992-05-29

1993-06-22

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359218, G02B 2608

Patent

active

052219860

ABSTRACT:
A scanning image-forming lens system is constructed by two lens groups composed of first and second lenses sequentially arranged from the side of a rotary polygon mirror to the side of a scanned face and having toric faces. The scanning image-forming lens system has a function for approximately providing a conjugate relation in geometrical optics between positions of the scanned face and a deflecting reflecting face of the rotary polygon mirror with respect to a cross scan-corresponding direction, and has and f.theta. function with respect to a main scan-corresponding direction. The first and second lenses are arranged such that the first and second lenses are respectively shifted from a reference optical axis by distances .DELTA..sub.1 and .DELTA..sub.2 in the main scan-corresponding direction. The distances .DELTA..sub.1 and .DELTA..sub.2, and focal lengths f.sub.1 and f.sub.2 of the first and second lenses with respect to the main scan-corresponding direction satisfy the following conditions:

REFERENCES:
patent: 4859011 (1989-08-01), Takahashi
patent: 5015050 (1991-05-01), Itabashi
patent: 5029956 (1991-07-01), Takahashi et al.
patent: 5031979 (1991-07-01), Itabashi
patent: 5062679 (1991-11-01), Itabashi
patent: 5064261 (1991-11-01), Itabashi

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