Flash exposure apparatus for avoiding red-eye effect

Details Flash exposure apparatus for avoiding red-eye effect Flash exposure apparatus for avoiding red-eye effect

1992-03-06

1992-10-06

Adams, Russell E.

354418, 354132, G03B 1505

Patent

active

051536323

ABSTRACT:
A flash exposure apparatus for eliminating red-eye effect employs first and second flash devices in conjunction with a camera. The camera outputs a first release signal prior to an exposure operation and a second release signal in synchronism with the exposure operation. A detecting device detects completion of preparation (charging) of flash light emission of the flash devices. When the completion of preparation of flash light emission of both flash devices is detected, the first and second flash devices are caused to emit light in response to the first and second release signals, respectively. When the completion of preparation of flash light emission of only one flash device is detected, only that flash device is caused to emit light in response to the second release signal. In another embodiment a main flash device emits light for illuminating an object, and an auxiliary flash device emits light, prior to emission by the main flash device, to decrease the pupil diameter of a human eye. A detecting device detects the focal length of a photo-taking lens, and the emission energy of the auxiliary flash device is increased as the detected focal length becomes longer.

REFERENCES:
patent: 4051494 (1977-09-01), Fujita et al.
patent: 4285588 (1981-08-01), Mir
patent: 4415247 (1983-11-01), Takematsu
Piper, Floyd G., "psa Journal," Jul. 1952, vol. 18, No. 7A, pp. 425, 426 & 444.

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