Rotary mirror scanner unit having optical angular displacement s

Details Rotary mirror scanner unit having optical angular displacement s Rotary mirror scanner unit having optical angular displacement s

1995-06-15

1997-04-29

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023113, 250237G, 358482, 358497, H04N 104, G03B 300

Patent

active

056251831

ABSTRACT:
In a scanner unit for An overhead image scanner, a rotatably mounted mirror reflects light from a surface to be scanned off to a focusing lens to form an optical image of a scanned line on a linear image sensor. An extension arm is connected to the minor for rotation therewith. To one end of the arm is attached an electromagnetic drive system and to the other end a light reflecting member which is formed with a multiplicity of microscopically spaced apart tracks running parallel to the length of the extension arm. A laser beam spot is formed on the reflecting member and a photodiode array detects reflections therefrom to produce a plurality of output signals representative of the amounts of reflections incident on different areas of the array. The outputs of the photodiode array are processed to produce a tracking error pulse when the minor is rotated by a predetermined amount of arc and a control current is supplied to the electromagnetic drive system so that the mirror is driven at a substantially constant speed. The tracking error pulse is supplied to the linear image sensor to cause the optical image of the scanned line to be converted to an electrical signal.

REFERENCES:
patent: 3538333 (1970-11-01), Dorow
patent: 3538334 (1970-11-01), Shaffer, Jr.
patent: 4638156 (1987-01-01), Horikawa et al.
patent: 5159192 (1992-10-01), Nishimura et al.
patent: 5223710 (1993-06-01), Pavlak
patent: 5235177 (1993-08-01), Hutchinson et al.
patent: 5245172 (1993-09-01), Esslinger et al.
patent: 5247173 (1993-09-01), Benchetrit et al.

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