Device for illuminating display unit in viewfinder

Details Device for illuminating display unit in viewfinder Device for illuminating display unit in viewfinder

1985-01-07

1985-11-26

Lazarus, Ira S.

Illumination

Supported by vehicle structure

Condition responsive

362 5, 362 29, 362 30, G03B 1718, G03B 1720

Patent

active

045551707

ABSTRACT:
A device for controlling a light source in a viewfinder of a camera, such as may be used for illuminating a liquid crystal display unit, having a simple operation and which is saving of power. An operating switch is provided for operating the light source. A timer is initiated when the operating switch is turned off. The light source is maintained turned on while the operating switch is turned on and while the timer is operating, and the light source is turned off when the operating switch is turned on during the operation of the timer.

REFERENCES:
patent: 4074292 (1978-02-01), Nakamoto et al.
patent: 4118712 (1978-10-01), Kawasaki
patent: 4149795 (1979-04-01), Sakurada et al.
patent: 4302086 (1981-11-01), Suzuki et al.
patent: 4313657 (1982-02-01), Tokutomi et al.
patent: 4334220 (1982-06-01), Suzuki et al.
patent: 4396263 (1983-08-01), Yamada
patent: 4450506 (1984-05-01), Hasegawa
patent: 4457612 (1984-07-01), Suzuki et al.
patent: 4461560 (1984-07-01), Yoshino et al.

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