Zooming control apparatus for a camera

Details Zooming control apparatus for a camera Zooming control apparatus for a camera

1991-05-23

1992-09-15

Adams, Russell E.

354400, G03B 118, G03B 300

Patent

active

051482010

ABSTRACT:
A zoom lens is zoomed selectively in either of two opposite directions by a motor which is rotated by a driver. First and second zoom switches cause the zoom lens to move at a higher speed. Third and fourth zoom switches cause the zoom lens to move at a lower speed for precisely stopping the zoom lens. A CPU connected to the four switches controls a zoom motor to rotate selectively at higher and lower speeds. The first and third zoom switches cause the zoom lens to move in the direction of telephotography, while the second and fourth zoom switches cause the zoom lens to move in the direction of wide-angle photography. In order to keep the speed of the zoom lens unchanged despite the difference in its direction, an electric current of a larger electric power is applied to the motor for rotation in the direction that requires more work.

REFERENCES:
patent: 4002405 (1977-01-01), Stahl
patent: 4046465 (1977-09-01), Toyama et al.
patent: 4896179 (1990-01-01), Watanabe et al.
patent: 4972215 (1990-11-01), Kitamura et al.

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