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:
Jan. 23, 2018
Filed:
Sep. 17, 2015
Applicant:
Takahiro Kado, Kanagawa, JP;
Inventor:
Takahiro Kado, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N 9/31 (2006.01); G02B 26/08 (2006.01); G09G 5/10 (2006.01); G02B 26/02 (2006.01); G09G 3/00 (2006.01); G09G 3/34 (2006.01);
U.S. Cl.
CPC ...
H04N 9/3182 (2013.01); G02B 26/0833 (2013.01); G09G 3/002 (2013.01); H04N 9/312 (2013.01); H04N 9/317 (2013.01); G02B 26/02 (2013.01); G09G 3/346 (2013.01); G09G 2320/0653 (2013.01); G09G 2320/0693 (2013.01);
Abstract
An image projection apparatus includes a light source to emit light, a light modulator to modulate intensity of the light emitted from the light source for generating a projection image, and an image luminance controller to control the light modulator to maintain brightness of the projection image projected on a projection face at a substantially constant level during a given time period of the image projection apparatus. The given time period is from one time point when power supply to the image projection apparatus is started to another time point when a power level for driving the light source is increased to a given power level.