Patent
1978-07-28
1980-03-18
Hix, L. T.
354289, G03B 1505, G03B 1718
Patent
active
041936779
ABSTRACT:
A warning circuit in an auto-controlled flashlight device comprises a first circuit for generating a voltage corresponding to the guide number determined by film sensitivity, aperture value and object distance, a second circuit for generating a maximum voltage corresponding to the maximum value of the quantity of light emitted by the auto-controlled speed light and a minimum voltage corresponding to the minimum value of the quantity of light emitted by the auto-controlled speed light, comparator means for comparing the output voltage of said first circuit with said maximum voltage and said minimum voltage and generating a high-level signal when the output voltage is in the range of said maximum voltage value and said minimum voltage value but generating a low-level signal when the output voltage is beyond the range, and a light emitting display element turned on in response to the high-level signal from the comparator means.
REFERENCES:
patent: 3499375 (1970-03-01), Kubayashi et al.
patent: 3696721 (1972-10-01), Wagner
patent: 4051491 (1977-09-01), Toyoda
patent: 4096498 (1978-06-01), Okuno et al.
patent: 4122465 (1978-10-01), Hasigawa et al.
Hasegawa Hiroshi
Nakano Kunihiro
Hix L. T,.
Nippon Kogaku K.K.
Perkey William B.
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