Patent
1983-02-08
1985-03-05
Perkey, William B.
354410, G03B 7091, G03B 1505
Patent
active
045027757
ABSTRACT:
A camera flash photographing control device having a signal conversion element which generates step wave voltage for which a signal level is gradually varied as time passes, by the operation of a counter which receives a pulse signal. A signal conversion element is operated as an A-D converter in which digital signal output which corresponds to a required signal level is obtained by converting both analogue signals of luminance information of an object and iris information of a photographing lens into said required signal level at the time of light measurement before shutter release. A signal conversion element is operated as a digital-analogue converter in which analogue signal output which corresponds to a pulse signal is obtained by converting the digital signal input of film sensitivity information into a required pulse signal at the time of shutter control after shutter release. Digital signal output from a signal conversion element is stored in memory as camera photographing information at the time of shutter control and analogue signal output from a signal conversion element is sent as information on the degree of flash light emission at the time of shutter control.
REFERENCES:
patent: 3988069 (1976-10-01), Kitaura
patent: 4162839 (1979-07-01), Mashimo et al.
patent: 4297011 (1981-10-01), Adams, Jr.
patent: 4297012 (1981-10-01), Nakai
Asahi Kogaku Kabushiki Kaisha
Perkey William B.
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