Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-11-19
1983-11-22
Britton, Howard
Facsimile and static presentation processing
Facsimile
Recording apparatus
350429, 358210, 358225, H04N 104
Patent
active
044172818
ABSTRACT:
An image magnification control mechanism for a facsimile zoom lens is provided in which a position detecting section is directly coupled to a drive member for moving the optical system of the zoom lens. The positions of the lens groups are controlled by a servo mechanism controlled by a pulse signal from the detecting section which also controls the speed of the zoom lens. An address instruction detecting section is used to achieve the positioning operation quickly and accurately. In the preferred embodiment, the invention is comprised of a stationary detection slit and a rotary member having only a finite number of slits corresponding to different magnification ratios. Speed control slits are provided on either side of either the stationary or movable slits to provide signals for stepwise increasing or decreasing the zooming speed. Address slits and corresponding detectors are provided for determining which of the magnification ratios is presently being used.
REFERENCES:
patent: 3435136 (1969-03-01), Bachmann
patent: 4161756 (1979-07-01), Thomas
patent: 4345276 (1982-08-01), Colomb
Asahi Kogaku Kogyo Kabushiki Kaisha
Britton Howard
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