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. 03, 2013
Filed:
Sep. 09, 2009
Shu Namba, Osaka, JP;
Shigekazu Yamagishi, Osaka, JP;
Yoshimasa Fushimi, Osaka, JP;
Naoko Yamashita, Hyogo, JP;
Shu Namba, Osaka, JP;
Shigekazu Yamagishi, Osaka, JP;
Yoshimasa Fushimi, Osaka, JP;
Naoko Yamashita, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A projection display device that includes: a light source unitthat includes a discharge lampas a light source; an image formation unit; a projection optical system; and a light source cooling unit that cools the light source unit. The light source unit is disposed so that a lamp axis that connects two discharge electrodes of the discharge lamp is orthogonal to a projecting direction of the projection optical system, and the light source unit includes: a concave mirror; and a transparent partthat covers an opening of the concave mirror. The light source cooling unit includes: a blowing fan that supplies cooling air; a plurality of air blowing portsanddisposed at the concave mirror or a connecting part that connects the concave mirror and the transparent part; an air ductthat connects the air blowing ports and the blowing fan; a branch switching valvethat is disposed in the air duct and switches between a plurality of branch flow paths so as to allow the cooling air to flow therethrough; and a control valve that is provided for each of the air blowing ports and rotated around a supporting axis by the action of gravity depending on a posture of the light source cooling unit, thereby controlling a wind direction so that the cooling air is blown from above the discharge lamp. The top of the light source lamp is cooled effectively regardless of the installation posture of the projection display device.