Camera for daylight and flash photography

Details Camera for daylight and flash photography Camera for daylight and flash photography

1978-10-13

1980-04-29

Adams, Jr., Russell E.

354 23D, 354 60F, 354139, G03B 716

Patent

active

042003709

ABSTRACT:
An automatic exposure control system for cameras of flash photographic capabilities which is switched to either of the daylight or the mode depending upon whether or not a storage capacitor across which a flash tube is connected is sufficiently charged. The system comprises first and second computers for deriving daylight and flash exposure aperture values respectively, a diaphragm control circuit selectively receptive of the outputs of the computers through a first switch, first and second timing circuits for providing daylight and flash exposure times respectively, and a shutter control circuit selectively receptive of the outputs of the timing circuits through a second switch. The system is characterized in the use of a single mode selection actuator which is common to the first and second switches and which causes an automatic selection of the flash mode when the camera release occurs after the attainment of the voltage of the storage capacitor to the normal firing level. Thus, it is made possible to prevent occurrence of an event where the flash tube is actuated for firing with the simultaneous occurrence of selection of the flash exposure time, while the daylight exposure aperture remains effective, as the storage capacitor voltage reaches the normal firing level at a point in time during the daylight exposure operation.

REFERENCES:
patent: 3953864 (1976-04-01), Iwata et al.
patent: 4016575 (1977-04-01), Uchiyama et al.
patent: 4021824 (1977-05-01), Uchiyama et al.

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