Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-01-31
1998-11-17
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
359212, 359216, H01J 314
Patent
active
058380019
ABSTRACT:
A scanning optical device that includes a light source for emitting a light flux; a polygon mirror including a plurality of reflecting surfaces for deflecting the light flux to form a scanning beam spot on an image surface; a polygon mirror cover that covers the polygon mirror; and an optical sensor. The polygon mirror is provided with a mark on the top surface thereof that is eccentric from a rotation axis of the polygon mirror. Also, the polygon mirror cover includes a cylindrical rib formed on an inner surface of the top wall projecting toward the polygon mirror in a space between the top wall and the polygon mirror. The optical sensor is provided for detecting the mark and projects toward the polygon mirror from the inner surface of the top wall, through the cylindrical rib, such that the optical sensor forms a part of the cylindrical rib.
REFERENCES:
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patent: 4826271 (1989-05-01), Takahashi et al.
patent: 4967076 (1990-10-01), Schuhmacher et al.
patent: 5089081 (1992-02-01), Bedzyk
patent: 5179271 (1993-01-01), Lindacher et al.
patent: 5671081 (1997-09-01), Hisa
patent: 5675431 (1997-10-01), Bock
Iima Mitsunori
Kanazawa Hiroshi
Minakuchi Tadashi
Oono Masahiro
Allen Stephone B.
Asahi Kogaku Kogyo Kabushiki Kaisha
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