Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-01-04
1991-11-05
Bovernick, Rodney B.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359217, 359218, 359710, 359711, 359662, G02B 2608, G02B 304
Patent
active
050626795
ABSTRACT:
In an optical scanner, a light beam from a light source is formed as a line image extending in a main scanning corresponding direction and is deflected at an equal angular velocity by a rotary polygon mirror having a reflecting face in the vicinity of an image forming position of the line image and is then formed by an image forming lens system in the shape of a spot on a scanned face to optically scan the scanned face. An f.theta. lens system focuses and forms the light beam deflected by the rotary polygon mirror as an image on the scanned face. The f.theta. lens system comprises a functional device having a function for connecting a reflecting position of the rotary polygon mirror and the scanned face in an approximately conjugate relation with respect to a secondary scanning direction and an f.theta. function with respect to a main scanning direction; and two groups of first and second lenses are sequentially arranged from the side of the rotary polygon mirror toward the scanned face side. The lenses have first to fourth lens faces providedr from the side of the rotary polygon mirror and have shapes on a deflecting plane sequentially composed of an arc, a straight line, a straight line and an arc from the first to fourth lens faces. The first and second lenses respectively have negative and positive refracting powers on a plane parallel to the deflecting plane.
REFERENCES:
patent: 4836630 (1989-06-01), Takanashi
patent: 4846539 (1989-07-01), Takahashi
patent: 4919502 (1990-04-01), Yamakawa
Bovernick Rodney B.
Phan James
Ricoh & Company, Ltd.
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