Camera using calibrated aperture settings for exposure control

Details Camera using calibrated aperture settings for exposure control Camera using calibrated aperture settings for exposure control

1996-06-28

1997-02-25

Perkey, W. B.

Photography

With object illumination for exposure

Having artificial illumination termination control

348362, 348371, 396236, G03B 700, G03B 1505

Patent

active

056063920

ABSTRACT:
A camera includes a mechanically-controlled aperture mechanism providing two or more aperture sizes for regulation of the intensity of image light gathered by the camera, a storage device for storing aperture calibration data corresponding to the measured transmissivity of each aperture size, and means for controlling camera exposure according to the value of one or more exposure parameters other than the aperture. The exposure errors caused by the aperture mechanism are thereupon compensated for with an exposure circuit that utilizes the stored aperture calibration data in order to establish the value of at least one of the exposure parameters other than the aperture. Such other exposure parameters include the shutter time and quench time for a flash, and in the case of an electronic camera the gain applied to the captured image signal.

REFERENCES:
patent: 4210394 (1980-07-01), Sato et al.
patent: 4400072 (1983-08-01), Suzuki et al.
patent: 4423934 (1984-01-01), Lambeth et al.
patent: 4737814 (1988-04-01), Nakajima
patent: 4881094 (1989-11-01), Terui et al.
patent: 4916477 (1990-04-01), Date
patent: 5371691 (1994-12-01), Seki et al.

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