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:
Aug. 09, 2011
Filed:
Oct. 29, 2007
Akihiro Yamada, Tokyo, JP;
Motoo Takahashi, Tokyo, JP;
Akira Daijogo, Tokyo, JP;
Tomohiro Bessho, Tokyo, JP;
Kenji Samejima, Tokyo, JP;
Akihiro Yamada, Tokyo, JP;
Motoo Takahashi, Tokyo, JP;
Akira Daijogo, Tokyo, JP;
Tomohiro Bessho, Tokyo, JP;
Kenji Samejima, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A projection display apparatusin which the light quantity adjusting means has a simple and readily interchangeable structure, and which can improve image quality by adjusting the quantity of light received by a light valve continuously, without causing illuminance irregularities, and without having unwanted light radiated onto the screen, the light quantity adjusting meanshaving light blocking membersL,R for blocking light in transit to a second lens array, and rotational axesLA,RA for turnably supporting each of the light blocking members on an xy plane, the light blocking membersL,R and rotational axesLA,RA being positioned so that the rotational axesLA,RA are disposed in positions symmetric with respect to the optical axis AX on the xy plane, and the turning range from the light blocking initiation position at which the light blocking membersL,R, by being turned, start to block light in transit toward the second lens arrayto the maximum light blocking position at which the light blocking membersL,R block a maximum quantity of the light in transit toward the second lens arrayis equal to or less than ninety degrees.