Projection lamp control arrangement

Details Projection lamp control arrangement Projection lamp control arrangement

1979-06-13

1981-08-11

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With load device temperature modifier

Automatic control of the temperature modifier

315307, 353 57, H05B 4136, H01J 6152

Patent

active

042836581

ABSTRACT:
A control circuit is provided in projection apparatus to control the operating characteristics of the projection lamp. The projection lamp control circuit maintains a constant illumination output and color temperature of the projection lamp to provide improved operation and increased lamp operating life. The desired operating point of the projection lamp is accurately maintained by sensing the operating point of the projection lamp and utilizing the sensed deviation from the desired operating point to vary the output of a blower that provides cooling of the lamp. Thus, the operating point and color temperature of the projection lamp is accurately maintained in a closed loop arrangement by sensing the operating point of the lamp and controlling the blower output. The control arrangement provides a first predetermined blower output during the projection lamp-off mode, a second predetermined blower output (off in a specific arrangement) during the projection lamp ignition and start-up mode and a variable output in a closed loop arrangement during normal projection lamp operation.

REFERENCES:
patent: 2315919 (1943-04-01), Babcock
patent: 4146819 (1979-03-01), Hunter

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