Control circuit for an automatic electronic flash light device

Details Control circuit for an automatic electronic flash light device Control circuit for an automatic electronic flash light device

1979-02-09

1980-12-23

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

250214L, 354 33, 356223, H05B 4132

Patent

active

042412790

ABSTRACT:
In an automatic electronic flash light device, a light measuring circuit includes an operational amplifier, a photosensor connected between the positive and negative inputs of the operational amplifier and a diode for log-compression connected in a feedback circuit of the operational amplifier. The output of the light measuring circuit is thus log-compressed and the log-compressed output is applied to an operational circuit which gives an output for controlling exposure.

REFERENCES:
patent: 3779142 (1973-12-01), Ya ta et al.
patent: 4139289 (1979-02-01), Yamada et al.
patent: 4158492 (1979-06-01), Kitaura et al.

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