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:
Mar. 21, 2017
Filed:
Sep. 25, 2014
Applicant:
Alps Electric Co., Ltd., Tokyo, JP;
Inventor:
Toru Yoshida, Miyagi-Ken, JP;
Assignee:
ALPS ELECTRIC CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03H 1/22 (2006.01); G03H 1/00 (2006.01); G02B 27/01 (2006.01); G03H 1/32 (2006.01);
U.S. Cl.
CPC ...
G02B 27/0103 (2013.01); G02B 27/01 (2013.01); G03H 1/2286 (2013.01); G03H 1/2294 (2013.01); G02B 2027/0118 (2013.01); G03H 1/32 (2013.01); G03H 2001/2284 (2013.01); G03H 2222/18 (2013.01); G03H 2240/51 (2013.01);
Abstract
An image display apparatus includes at least one light source to emit coherent light, a holographic optical element to diffract the coherent light from the light source to produce image light, an optical mechanism to guide the image light from the holographic optical element, at least one detection unit to detect the intensity of the image light, and an adjustment unit to adjust the power of the light source based on the result of detection by the detection unit. An image based on the image light is observed by a viewer.