Photometry device and camera with photometry device

Details Photometry device and camera with photometry device Photometry device and camera with photometry device

1995-11-22

1998-02-10

Metjahic, Safet

Photography

Exposure control circuit

Having plural photocells

396234, 396 93, G03B 300, G03B 708

Patent

active

057179654

ABSTRACT:
A device has a photometry unit for performing a photometry operation of an object field using an accumulation type photometry element, and an accumulation time determination unit for determining the accumulation time of the photometry element. The accumulation time determination unit determines the value of the accumulation time for the next photometry operation by calculating a weighted average of the accumulation times in previous photometry operations. Since the value of the accumulation time for the next photometry operation is determined by calculating a weighted average of the accumulation times in previous photometry operations, the influence of flickering of an illumination light source can be eliminated, and a photometered value can be output within a short period of time.

REFERENCES:
patent: 4041308 (1977-08-01), Fujita
patent: 5086314 (1992-02-01), Aoki et al.
patent: 5373340 (1994-12-01), Takagi
patent: 5515132 (1996-05-01), Iwasaki
patent: 5526088 (1996-06-01), Kusaka
patent: 5526092 (1996-06-01), Iwasaki

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