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:
Oct. 11, 2011
Filed:
Sep. 25, 2007
Takao Endo, Tokyo, JP;
Yuzo Nakano, Tokyo, JP;
Takeshi Utakoji, Tokyo, JP;
Yasuharu Koyata, Tokyo, JP;
Takao Endo, Tokyo, JP;
Yuzo Nakano, Tokyo, JP;
Takeshi Utakoji, Tokyo, JP;
Yasuharu Koyata, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
Not only abnormality of a light output to an exterior but also overturning, vibration, disassembly, deformation, or breakage of a display apparatus including a case and a screen are reliably and promptly detected. A projection display apparatus includes a light source () for generating illumination light, which is provided in a case () having a light-shielding function, a movable aperture () for adjusting the amount of illumination light from the light source (), a light valve () for adjusting the amount of light based on an image signal to generate image light for forming an image from the illumination light, a projection optical system () for enlarging the image light from the light valve (), and a transmission-type screen () for displaying the image, which is provided to a window of the case (). The projection display apparatus further includes first to ninth detectors (to) for detecting the abnormality of the light output of the light source () to the exterior and the abnormality of the case () or the transmission-type screen (), a warning and alarm unit () for notifying the abnormality by sound or light, and a control unit () for controlling an internal operation when the abnormality is detected.