Patent
1989-10-02
1992-06-16
Hix, L. T.
3542711, G03B 118
Patent
active
051228220
ABSTRACT:
An apparatus for detecting an open F number in a zoom lens camera including a cam ring which rotates to vary the focal length of a zoom lens, a reflection plate which is secured to the outer periphery of the cam ring and which has light reflecting portions and non-reflecting portions alternately arranged, as viewed along the circumferential direction of the cam ring, a photoreflector which emits light onto the reflection plate and which detects light reflected by the reflection plate, and an arithmetic device which calculates an open F number of the zoom lens using the output of the photoreflector.
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Aoki Harumi
Mogamiya Makoto
Morisawa Tahei
Ogawa Kimiaki
Asahi Kogaku Kogyo Kabushiki Kaisha
Gray David M.
Hix L. T,.
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