Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-05-25
1991-11-12
Bovernick, Rodney B.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359662, G02B 2608, G02B 304
Patent
active
050642618
ABSTRACT:
In an f.theta. lens system in an optical scanner, an approximately parallel light beam from a light source device is formed as a line image extending in a main scan-corresponding direction and is deflected at an equal angular velocity by a rotary polygon mirror having a reflecting face in the vicinity of the position of the formed line image. The deflected light beam is formed by an image forming lens system as an image in the shape of a spot on a scanned face to optically scan the scanned face at an approximately equal speed. The image forming lens system forms the light beam deflected by the rotary polygon mirror as an image on the scanned face. The f.theta. lens system includes a functional device having a function for setting a reflecting position of the rotary polygon mirror and the scanned face in an approximately conjugate relation in geometrical optics with respect to a cross 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 which are counted from the side of the rotary polygon mirror and respectively have shapes of an arc, an arc, a straight line and an arc on a deflecting plane sequentially from the first lens face toward the fourth lens face.
REFERENCES:
patent: 4836630 (1989-06-01), Takanashi
patent: 4846539 (1989-07-01), Takahashi
patent: 4859011 (1989-08-01), Takanashi
patent: 4919502 (1990-04-01), Yamakawa
patent: 5015050 (1991-05-01), Itabashi
Bovernick Rodney B.
Phan James
Ricoh & Company, Ltd.
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