Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1990-03-16
1992-03-17
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 57, 355 61, 355235, G03B 2770
Patent
active
050972901
ABSTRACT:
A copying machine has an optical unit for forming a latent image on a photosensitive drum which corresponds to an original document supported for copying on a glass table of the copying machine. The copying machine is operable in two copying modes, in which the document is positioned at either a left reference mark on the glass table or at a right reference mark. The optical unit includes four (4) mirrors for scanning the original document and a lens, which are supported for movement on a plurality of carriages. In the left reference mode, a document to be copied is positioned at the left side of the glass table. The first carriage, which supports a first mirror, is moved to scan the document to be copied. A second carriage, which supports a second and third mirror, is also moved during the scanning operation but at one-half the speed of the first carriage. In the right reference mode, a document to be copied is set at the right side of the glass table. In this mode, before the start of the scanning operation, the first carriage is first moved to a maximum copyable position in the left reference mode. Then, the first carriage is moved further beyond the maximum copyable position. At the same time, either the second, third and fourth carriages are moved, or only the fourth carriage is moved so that length of the optical path from the document to the lens is equal to the length of the optical path from the lens to the surface of the photosensitive drum.
REFERENCES:
patent: 4256400 (1981-03-01), Komori
patent: 4334762 (1982-06-01), Landa
patent: 4561770 (1985-12-01), Yamaguchi et al.
patent: 4650317 (1987-03-01), Oushiden et al.
patent: 4666288 (1987-05-01), Watanabe
patent: 4739372 (1988-04-01), Watanabe
patent: 4740811 (1988-04-01), Watanabe
Hayes Monroe H.
Kabushiki Kaisha Toshiba
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