The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 18, 2012
Filed:
Jun. 09, 2010
Takeshi Katayama, Yokohama, JP;
Miyuki Ikeda, Yokohama, JP;
Hirotoshi Kemi, Fujisawa, JP;
Hideharu Saito, Yokohama, JP;
Takeshi Katayama, Yokohama, JP;
Miyuki Ikeda, Yokohama, JP;
Hirotoshi Kemi, Fujisawa, JP;
Hideharu Saito, Yokohama, JP;
Hitachi Consumer Electronics Co., Ltd., Tokyo, JP;
Abstract
A projection display device includes: a dustproof filter that removes dust and a foreign material from drawn air; an air guide path that guides, to a liquid crystal panel, the cooling air blown by a suction fan; an air velocity detector that is arranged in the air guide path and detects the velocity of the cooling air that flows in the air guide path; and a CPU that determines, on the basis of the value detected by the air velocity detector, whether or not the dustproof filter is clogged. The air velocity detector detects the velocity of the cooling air by measuring the temperature of the air in the vicinity of the heat generating element that will be increased due to heat transfer generated by the heat generating element. This configuration improves accuracy in determining whether or not the dustproof filter is clogged.