Flash lighting apparatus

Details Flash lighting apparatus Flash lighting apparatus

1993-09-03

1995-06-13

Adams, Russell E.

Illumination

Supported by vehicle structure

Condition responsive

3542271, 3541491, 354126, 362 18, G03B 1505

Patent

active

054247977

ABSTRACT:
A flash lighting apparatus effects proper lighting for different portions of an object field by the use of a light control device disposed on an optical path between a flash light emitter and the object field. In one embodiment, the flash light control device has a plurality of main control portions and at least one sub-control portion adjacent to main control portions. An adjusting circuit adjusts the quantity of light projected by the control portions so that the quantity of light projected by a sub-control portion may be between the quantities of light projected by the adjacent main control portions. In one embodiment, a single booster circuit provides boosted voltage for use in a light emission control circuit that causes flash light emission and also for use in a control circuit for a light control device. In one embodiment, a photometering circuit photometers areas of an object field, and the number of light control portions is greater than the number of photometered areas.

REFERENCES:
patent: 4085316 (1978-04-01), Quinn
patent: 4501481 (1985-02-01), Kataoka et al.
patent: 4816854 (1989-03-01), Tsuji et al.
patent: 4847680 (1989-07-01), Okino
patent: 4941009 (1990-07-01), Yoshida
patent: 5164759 (1992-11-01), Yasukawa

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