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US 6,472,828 B1Granted
Control for projector lamp heat dissipation
AssigneeInFocus Corporation
InventorsHenry Frazier Pruett, Fred Parker, Roger Yaffe, Jeff Gohman, Cathy Biber
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AssigneeInFocus Corporation
InventorsHenry Frazier Pruett, Fred Parker, Roger Yaffe, Jeff Gohman, Cathy Biber
Estimating the term…
A portable image projector is provided with a fan having a control system for cooling a metal-halide arc lamp. The arc lamp cooling system of the present invention includes a fan having a fan control to operate the fan at an initially reduced level during lamp start-up to allow the temperature of the arc lamp to increase to its full operating temperature. The fan control includes a microcontroller to operate the fan at a reduced voltage over a period of time after which the voltage is increased to operate the fan at full capacity. Power to the fan may be increased in incremental time steps or linearly over a period of time as determined by the microcontroller.
An image projection system for a display device including a light source enclosed within a housing, the light source including an arc lamp for producing a high intensity illumination beam, wherein the arc lamp draws reduced power during ignition after which the arc lamp draws increased power until at completion of an initial start-up period the arc lamp reaches a full operating intensity, comprising:
In an image projection system for a display device including a light source enclosed within a housing, the light source including an arc lamp for producing a high intensity illumination beam, wherein the arc lamp draws reduced power during ignition after which the arc lamp draws increased power until at completion of an initial start-up period the arc lamp reaches a full operating intensity, a method of cooling the arc lamp, comprising:
Dependencies are inferred from the claim text.