Load-control system responsive to operating condition of produce

Details Load-control system responsive to operating condition of produce Load-control system responsive to operating condition of produce

1973-03-07

1976-01-13

Safourek, Benedict V.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

178DIG15, 315150, 315159, 325394, H04B 900

Patent

active

039327426

ABSTRACT:
The operating condition of a producer of intermittent radiation, such as a motion-picture projector or a television receiver, is monitored by a detector circuit including a photoelectric transducer followed by a filter with a pass band centered on the interruption frequency. The detector output is used to control the lighting of a lamp or the drawing of a curtain in a room where ambient illumination is to be suppressed or reduced during operation of the monitored apparatus. In one embodiment, the band-pass filter is inserted in a negative-feedback loop which suppresses the frequencies falling within its pass band. A band-stop filter may be connected in cascade with the band-pass filter to block the passage of signals due to other radiation such as ambient artificial light.

REFERENCES:
patent: 2992412 (1961-07-01), Spindler
patent: 3444544 (1969-05-01), Pearson et al.
patent: 3475092 (1969-10-01), Harvey
patent: 3534351 (1970-10-01), Harnden et al.
patent: 3573463 (1971-04-01), Goodwin
patent: 3639841 (1972-02-01), Richardson
patent: 3727061 (1973-04-01), Dworkin
patent: 3748591 (1973-07-01), Visioli, Jr. et al.
"Transistor Physics and Circuits" (pp. 288-293) by Riddle & Ristenbatt, 1958.

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