Illumination mode switching circuit for automatic electronic fla

Details Illumination mode switching circuit for automatic electronic fla Illumination mode switching circuit for automatic electronic fla

1982-06-16

1983-07-26

Adams, Russell E.

354 60F, 354145, G03B 716

Patent

active

043951007

ABSTRACT:
An illumination mode switching circuit for an automatic electronic flash includes an illumination mode selecting, changeover switch having a first terminal which is utilized to establish an automatic illumination control level, a second terminal which provides a manual illumination control, and a third terminal which enables a full emission of flashlight from a flash discharge tube. An isolation diode is connected between the second and the third terminal. In this manner, any one of the three modes can be selected by operating the changeover switch.

REFERENCES:
patent: 4078242 (1978-03-01), Uchiyama et al.
patent: 4187019 (1980-02-01), Uchiyama et al.
patent: 4280760 (1981-07-01), Iwata et al.
"Photographic Industries", p. 97, Nov. 1, 1978.

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