Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1983-12-14
1984-10-02
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 57, G03B 2734
Patent
active
044744625
ABSTRACT:
In an optical copier having a zoom lens, the first and second lens groups are positive and negative, respectively, to provide sufficient movement range for the half-speed mirrors.
REFERENCES:
patent: 3880498 (1975-04-01), Liu et al.
patent: 4172635 (1979-10-01), Ogino
patent: 4304466 (1981-12-01), Betensky
patent: 4333711 (1982-06-01), Itoh et al.
The Focal Encyclopedia of Photography, The Macmillan Company, New York, 1960, pp. 1247-1248.
Arai Yasunori
Ogawa Ryota
Asahi Kogaku Kogyo Kabushiki Kaisha
Hayes Monroe H.
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