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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.:

US 10197895 B1

PDFFull Text
Date of Patent:
Feb. 05, 2019

Filed:

Mar. 02, 2016

Projection display device

Applicant:

Hamamatsu Photonics K.k., Hamamatsu-shi, Shizuoka, JP;

Inventors:

Naoto Sakurai, Hamamatsu, JP;

Akihiro Oguri, Hamamatsu, JP;

Assignee:

HAMAMATSU PHOTONICS K.K., Hamamatsu-shi, Shizuoka, JP;

Attorney:

Drinker Biddle & Reath LLP

Primary Examiner:

Douglas W Owens

Assistant Examiner:

Syed M Kaiser

Int. Cl.
CPC ...
G02B 21/00 (2006.01); G03B 21/20 (2006.01); B60K 35/00 (2006.01); G02B 26/10 (2006.01); H04N 5/74 (2006.01); G02F 1/1333 (2006.01); G09G 3/00 (2006.01); G09G 3/02 (2006.01); G09G 3/34 (2006.01); H04N 9/31 (2006.01); G02B 5/02 (2006.01); G03B 21/26 (2006.01);
U.S. Cl.
CPC ...
G03B 21/2033 (2013.01); B60K 35/00 (2013.01); G02B 5/0215 (2013.01); G02B 5/0278 (2013.01); G02B 26/10 (2013.01); G02B 26/101 (2013.01); G02F 1/1333 (2013.01); G03B 21/2053 (2013.01); G03B 21/2086 (2013.01); G03B 21/26 (2013.01); G09G 3/006 (2013.01); G09G 3/02 (2013.01); G09G 3/34 (2013.01); H04N 5/74 (2013.01); H04N 9/3129 (2013.01); H04N 9/3155 (2013.01); B60K 2350/2021 (2013.01); B60K 2350/2047 (2013.01); B60K 2350/2052 (2013.01); B60K 2350/2078 (2013.01); B60K 2350/352 (2013.01);
Abstract

A projection display device includes: a light source that emits a first and a second laser lights; a scanning drive mirror that reflects the first and the second laser lights, and uses the first and the second laser lights in scanning; a light diffusion unit that includes a predetermined region that allows the first laser light to be transmitted therethrough, and diffuses the first laser light; a light detection unit that detects the second laser light that passed the predetermined region; and a control unit that executes a process to detect the second laser light, and determines a state of the predetermined region on the basis of a detection value of the light detection unit. In a case where the control unit determines that a defect occurs in the predetermined region as the state, the control unit executes a process to stop displaying the projection.

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