Light measuring device

Details Light measuring device Light measuring device

1989-12-05

1991-02-19

Perkey, W. B.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354465, 3541271, 356215, 356218, G03B 1502, G01J 144

Patent

active

049948458

ABSTRACT:
An improved light measuring device for measuring flash light is provided, and includes a sensor for measuring the quantity of flash light to produce a flash measuring signal. A starting signal is produced upon a detection of the start of the flash emission to enable the sensor for measuring the quantity of flash light. The light measuring device is kept in an operative condition for a predetermined time period after it is manually turned on so that it is available to detect the start of any flash emission during that time period. A counter can be utilized to set the predetermined time period, and the counter can be reset in response to any light measuring operation.

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patent: 4227808 (1980-10-01), Yuasa
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patent: 4367932 (1985-01-01), Ishikawa et al.
patent: 4373793 (1983-02-01), Taniguchi et al.
patent: 4460263 (1984-07-01), Gfeller et al.
patent: 4637721 (1987-01-01), Naurse et al.
patent: 4644165 (1987-02-01), Ross et al.
patent: 4717934 (1988-01-01), Kobayashi et al.
patent: 4884094 (1989-11-01), Kitaura et al.

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