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. 20, 2016
Filed:
Jul. 03, 2014
Applicant:
Casio Computer Co., Ltd., Tokyo, JP;
Inventors:
Kei Hanzawa, Akishima, JP;
Eiji Yamakawa, Tama, JP;
Assignee:
CASIO COMPUTER CO., LTD., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01K 1/06 (2006.01); G04B 19/30 (2006.01); G04B 19/32 (2006.01); F21V 8/00 (2006.01);
U.S. Cl.
CPC ...
G04B 19/30 (2013.01); G02B 6/0055 (2013.01); G02B 6/0061 (2013.01); G04B 19/32 (2013.01); G02B 6/0018 (2013.01); G02B 6/0036 (2013.01); G02B 6/0068 (2013.01);
Abstract
There is provided an illumination device including: a light guide plate in which a light diffusion pattern of diffusing incident light is formed to have density that is coarse on one side and gets denser toward the other side; a first light source which is provided on a side corresponding to the one side of the light diffusion pattern in the light guide plate; and a second light source which is provided on a side corresponding to the other side of the light diffusion pattern in the light guide plate.