Light measuring device

Details Light measuring device Light measuring device

1979-11-20

1982-03-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250578, H01J 4014

Patent

active

043214622

ABSTRACT:
A number of photoreceptors are arranged in a matrix along X-lines and Y-lines. An X-direction multiplexer and a Y-direction multiplexer are connected with the X-lines and Y-lines, respectively. Log-conversion amplifiers are connected at the input of the Y-direction multiplexer to log-compress the output of the photoreceptor before it is inputted into the Y-direction multiplexer. All the circuitry including the photoreceptors, multiplexers and amplifiers are deposited on a single chip to make an IC element.

REFERENCES:
patent: 3902812 (1975-09-01), Honkawa
patent: 4099885 (1978-07-01), Kawasaki et al.
patent: 4182573 (1980-01-01), Yamada et al.

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