Cooling fan start-up control device for liquid crystal...

Details Cooling fan start-up control device for liquid crystal... Cooling fan start-up control device for liquid crystal...

2006-03-07

2006-03-07

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Temperature control

Blower

C349S005000

Reexamination Certificate

active

07008061

ABSTRACT:
A liquid crystal projector comprises a detector for detecting whether a cooling fan is stopped or is being rotated, a first controller for gradually raising a voltage to be applied to the cooling fan when the cooling fan is started, and a second controller for setting the voltage to be applied to the cooling fan to a predetermined normal operating voltage when the detector detects that the cooling fan is rotated in the process of gradually raising the voltage to be applied to the cooling fan by the first controller.

REFERENCES:
patent: 5621159 (1997-04-01), Brown et al.
patent: 6550920 (2003-04-01), Hosoda et al.
patent: 6776489 (2004-08-01), Suzuki
patent: 2002/0196606 (2002-12-01), Hirao et al.
Patent Abstracts of Japan, vol. 2002, No. 11, Nov. 6, 2002, & JP 2002 209393, Jul. 26, 2002.
European Search Report dated Aug. 3, 2004.

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