Camera having a through-the-lens automatic light adjustment cont

Details Camera having a through-the-lens automatic light adjustment cont Camera having a through-the-lens automatic light adjustment cont

1995-09-01

1997-07-29

Metjahic, Safet

Photography

With object illumination for exposure

Having preexposure illumination

G03B 700

Patent

active

056529295

ABSTRACT:
A low cost, compact multi-light through-the-lens adjustment unit for use in a camera which incorporates a built-in flash allowing an increase in the speed of a shutter release operation of the camera. A charged voltage of a charge accumulation unit is measured prior to a light pre-emission. The light pre-emission is initiated and thereafter terminated based on a quantity of reflected light detected. The time difference between the initiation of the light pre-emission and the termination of the light pre-emission is measured by a time difference measurement unit. The amount of light pre-emission light of the light emission unit is calculated based on the measured charged voltage and the time difference measurement. Alternatively, the charged voltage prior to light pre-emission is measured by a first voltage measurement unit and the charging voltage after light pre-emission is measured by a second voltage measurement unit. The amount of light pre-emission is calculated based on the difference between charged voltage prior to the light pre-emission and charging voltage after the light pre-emission.

REFERENCES:
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patent: 4998128 (1991-03-01), Coltman et al.
patent: 5164759 (1992-11-01), Yasukawa
patent: 5168300 (1992-12-01), Yasukawa
patent: 5221941 (1993-06-01), Matsui et al.
patent: 5227836 (1993-07-01), Yasukawa et al.
patent: 5268730 (1993-12-01), Takagi
patent: 5309193 (1994-05-01), Takagi
patent: 5371568 (1994-12-01), Takagi et al.
patent: 5422702 (1995-06-01), Yasukawa

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