Temperature compensation circuit in a pickup tube device

Details Temperature compensation circuit in a pickup tube device Temperature compensation circuit in a pickup tube device

1982-09-10

1985-01-15

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 514

Patent

active

044941455

ABSTRACT:
A temperature compensation circuit in a pickup tube device comprising a pickup tube, a bias lighting device provided at the front surface of the pickup tube for irradiating a bias light, a circuit for generating a shading compensation signal, and a circuit for supplying a black gate pulse, comprises a temperature compensation signal generating circuit for generating a temperature compensation signal for cancelling variation in a signal current component from the pickup tube due to variation in the bias light obtained from the bias lighting device which is in accordance with temperature variation, a compensation signal obtaining circuit for obtaining a compensation signal by multiplexing the temperature compensation signal generated by the temperature compensation signal generating circuit with the shading compensation signal, and a mixing circuit for mixing the multiplexed compensation signal, the output signal of the pickup tube, and the black gate pulse.

REFERENCES:
patent: 4109279 (1978-08-01), Hirose et al.
patent: 4301472 (1981-11-01), Danos

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