Method and apparatus for an anti-melt projection lens cap

Details Method and apparatus for an anti-melt projection lens cap Method and apparatus for an anti-melt projection lens cap

2007-09-25

2007-09-25

Fuller, Rodney (Department: 2851)

Optics: image projectors

Temperature control

C353S097000

Reexamination Certificate

active

11030118

ABSTRACT:
A method and apparatus for an anti-melt projection lens cap includes a sensor that detects whether the projection lens cap covers the projection lens and transmits a detected signal to the control unit including two control modes. The first one is projecting a dark image immediately, as the projection lens cap covers the projection lens for longer than a first set time, the control unit switches to a power-saving mode, when it lasts longer than a second set time, the lamp and the system power supply are turned off, then, a fan cools the lamp, the control unit switches to a standby mode. The second one is switching to the power-saving mode directly, when it lasts longer than a second set time, the lamp and the system power supply are turned off, and a fan cools the lamp, then, the control unit switches to the standby mode.

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