Photocopying – Contact printing – Light boxes
Patent
1974-12-30
1976-08-10
Corbin, John K.
Photocopying
Contact printing
Light boxes
355 8, 250235, G02B 2717, G03G 1528
Patent
active
039738256
ABSTRACT:
A flat field scanning system is disclosed which has the following characteristics: (a) a stationary lens is located between a scanning mirror and a medium; (b) the mirror is moved linearly for scanning; (c) at the start of scan, a beam is directed from or received by the mirror substantially on axis of the lens; (d) the beam distance from the object plane of the lens to the lens and from the lens to the image plane of the lens always increases from the start of scan to the end of scan; and (e) during movement of the mirror, the mirror is pivoted to continue to reflect the beam through or receive the beam from the center of the lens. Linear movements are utilized in the scanning system eliminating the use of intricate cam surfaces.
In one embodiment, the medium is either a recording medium or a document to be read by scanning and is located at the image plane of the lens. The scanning mirror is located between the object plane of the lens and the lens and scans the beam to the medium. A polygon scanner scans a beam onto the medium via the scanning mirror in an "X" direction while the scanning mirror provides scanning of the beam in a "Y" direction. In a modification of the above embodiment, an oscillating mini-scan mirror is located between the scanning mirror and the object plane and scans the beam to the scanning mirror in the "Y" direction. The scanning mirror is stationary allowing the mini-scan mirror to "Y" scan only a portion of the medium, which is usually 20-32 "X" scan lines or one text line. The scanning mirror is moved one text line at a time to allow mini "Y" scanning of the whole medium.
In another embodiment, the medium is a document illuminated by flood lamps and is positioned on the object plane of the lens. The scanning mirror is located between the image plane of the lens and the lens. A recording medium is located at the image plane of the lens to receive the image on the document.
REFERENCES:
patent: 3360659 (1967-12-01), Young
patent: 3448458 (1969-06-01), Carlson et al.
patent: 3497298 (1970-02-01), Watanabe
patent: 3652156 (1972-03-01), Lahr et al.
patent: 3661456 (1972-05-01), Suzuki
patent: 3689145 (1972-09-01), Kawakubo et al.
Rabedeau, "Mechanical Scanner", IBM Tech. Dis. Bul., vol. 8, No. 2, July, 1965, pp. 276-277.
Davioge, "Document Scanning Mechanism", IBM Tech. Dis. Bul., vol. 15, No. 9, Feb., 1973, pp.2687-2688.
Corbin John K.
Henry Jon W.
Raizes Sheldon F.
Xerox Corporation
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