Camera apparatus

Details Camera apparatus Camera apparatus

1973-12-17

1978-08-15

Hix, L. T.

Illumination

Supported by vehicle structure

Condition responsive

354 33, 354 34, 354 35, 354 59, 354145, 354286, 362 4, G03B 708, G03B 1505, G03B 1100

Patent

active

041077067

ABSTRACT:
An exchangeable lens barrel for use in a photographic camera is provided with a light sensitive element which, when the exchangeable lens barrel has been exactly fitted to the camera, receives the light which is reflected from the light sensitive film surface after it is transmitted through the objective lens and the iris aperture of the exchangeable lens barrel. A control system for an electronic flash tube in the camera or an electronic flash device fitted to the camera comprises a lighting control circuit and includes a timing circuit which controls the lighting of the electronic flash tube. The timing circuit is connected with the light sensitive element to generate a current which is integrated by the timing circuit, and the electronic flash tube is extinguished when the integrated voltage reaches a certain predetermined level, thereby the opening of the iris aperture in the exchangeable lens barrel in transmitted to the control circuit.

REFERENCES:
patent: 3180218 (1965-04-01), Durst
patent: 3212419 (1965-10-01), Fischer
patent: 3286609 (1966-11-01), Kobayashi et al.
patent: 3463065 (1969-08-01), Kobayashi
patent: 3714872 (1973-02-01), Mashimo et al.
patent: 3726197 (1973-04-01), Hasegawa
patent: 3779141 (1973-12-01), Ueda et al.

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