Patent
1993-10-12
1994-08-30
Perkey, W. B.
354419, 354421, 354422, G03B 1505, G03B 716
Patent
active
053432681
ABSTRACT:
A camera has a photomerry device to measure luminance of an object. The camera is provided with a strobe unit in which a strobe light is automatically emitted when the result of measurement by the photometry device is smaller than a predetermined luminance and an amount of light emission can be changed. The camera with the strobe unit includes a range finder to measure a distance of an object; a memory having a flashmatic calculation table in which F-number corresponding to the distance of the object are set according to a guide number which is used as a reference; a calculator in which a value of the guide number is changed according to a reference F-number in the flashmatic calculation table obtained by the measurement by the range finder and a desired F-number is found. The camera further includes a controller in which a strobe light is emitted by controlling the strobe unit by the desired F-number obtained by the calculation result of the calculator.
REFERENCES:
patent: 4724455 (1988-02-01), Suzuki et al.
patent: 4899191 (1990-02-01), Maruyama
patent: 5017955 (1991-05-01), Kotani
patent: 5255047 (1993-10-01), Ishimaru et al.
patent: 5257063 (1993-10-01), Ishimaru et al.
English language abstract of Japanese Patent Publication Open to Public Inspection No. 1-217443, Aug. 1989.
Konica Corporation
Perkey W. B.
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