Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-06-19
1982-05-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250214R, G01D 534
Patent
active
043318673
ABSTRACT:
The invention is directed to an instrument control apparatus capable of regulating the flow of electric current by detecting relative movement between an indicator and a control zone. A light source is positioned close to the control zone so that illumination from the control zone will change responsive to movement of the indicator. Illumination from the control zone is sensed and electrical resistance is varied in response to relative movement between the indicator and control zone for varying an output voltage. A first predetermined reference voltage is generated and the output and reference voltages are compared and a first predetermined output current is generated when one of the voltages is greater than the other one. A first circuit supplies electric current to the instrument. The first circuit is regulated by closing the first circuit and allowing electric current to flow through the first circuit when one of the conditions of an output current either above or below the first predetermined output current is created, the circuit opening and interrupting the flow of current when the other of the conditions occurs. A lamp circuit supplies electric current to the light source, the light source generating an output voltage when it is on. A second predetermined reference voltage is generated which is lower than the light source output voltage. The light source output and second reference voltages are compared and a second output current is generated when the light source output voltage is greater than the second reference voltage. The first circuit is opened for interrupting the flow of current to the instrument when the second output current is below a predetermined level and closed when the second output current is above the predetermined level.
REFERENCES:
patent: 4107661 (1978-08-01), Crosby
Chromaco, Inc.
Hostetter Darwin R.
Nelms David C.
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