Photography – With object illumination for exposure – Having artificial illumination termination control
Patent
1997-09-04
1999-03-09
Perkey, W. B.
Photography
With object illumination for exposure
Having artificial illumination termination control
396162, 396168, 396165, 396235, 396220, 396240, 396242, 396276, G03B 708, G03B 1505
Patent
active
058813268
ABSTRACT:
A shutter apparatus is provided wherein openings for defining a secondary aperture are formed in respective shutter blades, such that an amount of light transmitted through the secondary aperture is detected, and the drive force for driving the shutter blades is changed so that the amount of the received amount increases in the opening stroke according to a predetermined function. When the integrated quantity of the received light reaches a threshold value, the movement of the shutter blades is reversed, and the shutter speed is determined based on the integrated light quantity obtained upon completion of shifting to the closing stroke. Thus, variations in the exposure amount that occur upon reversal of the shutter blades are canceled in the closing stroke.
REFERENCES:
patent: 4255030 (1981-03-01), Johnson et al.
patent: 4427276 (1984-01-01), Feinerman et al.
Perkey W. B.
RIC Company Ltd.
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