Zoom apparatus for a camera having count generating means and co

Details Zoom apparatus for a camera having count generating means and co Zoom apparatus for a camera having count generating means and co

1994-10-20

1997-05-27

Metjahic, Safet

Photography

Having variable focal length of camera objective

Power zoom

396 87, G03B 1318

Patent

active

056341482

ABSTRACT:
The present invention is directed to a zoom encoder for detecting an amount of angular movement and a direction of angular movement of a cam ring which is angularly moved about an optical axis of a photographing optical system to change a focal length of the photographing optical system. The zoom encoder is characterized by comprising a pulse generator of non-contact type for generating pulse signals in accordance with the angular movement of the cam ring that serves as a drive for changing the focal length of the photographing optical system, a counter for selectively adding or subtracting the pulse signals in accordance with the direction of angular movement of the cam ring, a position detector for detecting a predetermined position signal at least in the vicinity of a wide angle end and in the vicinity of a telephoto end of the focal length, a count-value modifier for modifying the count value of the counter to a predetermined value in accordance with a change in an output from the position detector, and a zoom-information detector for producing zoom information on the basis of the output from the counter.

REFERENCES:
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 4857951 (1989-08-01), Nakajima et al.
patent: 5036348 (1991-07-01), Kusaka
patent: 5077571 (1991-12-01), Takayama et al.
patent: 5122822 (1992-06-01), Morisawa et al.
patent: 5142314 (1992-08-01), Ogawa

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