Lamp comprising automatically actuated louver system

Details Lamp comprising automatically actuated louver system Lamp comprising automatically actuated louver system

1983-07-01

1985-04-23

Walsh, Donald P.

Illumination

Light source and modifier

Condition responsive

362279, 362290, 362324, 362325, F21V 1702

Patent

active

045133581

ABSTRACT:
A lamp such as a fog lamp for a vehicle is provided with a housing which serves to mount an array of parallel louvers. The louvers are controlled by a heat driven actuator. Such as one which incorporates a shape memory metal actuator element. This actuator element is heated either by resistive heating or by direct heat of the light bulb when the lamp is activated. When heated, the actuator serves to pivot the louvers into an open position. Once the lamp is deactivated, heating of the actuator is terminated, and the louvers are automatically closed to protect the lens by a spring as the actuator cools.

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