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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 10928716 B1

PDFFull Text
Date of Patent:
Feb. 23, 2021

Filed:

Mar. 02, 2016

Projection display device

Applicant:

Hamamatsu Photonics K.k., Hamamatsu, JP;

Inventors:

Naoto Sakurai, Hamamatsu, JP;

Akihiro Oguri, Hamamatsu, JP;

Assignee:

HAMAMATSU PHOTONICS K.K., Hamamatsu, JP;

Attorney:

Faegre Drinker Biddle & Reath LLP

Primary Examiner:

Christina A Riddle

Assistant Examiner:

Christopher A Lamb, II

Int. Cl.
CPC ...
G03B 21/20 (2006.01); H04N 5/74 (2006.01); G02B 5/26 (2006.01); G02B 5/20 (2006.01); G02B 26/10 (2006.01); G02B 5/02 (2006.01); G02B 27/09 (2006.01); G03B 21/28 (2006.01); B60K 35/00 (2006.01); G02B 27/01 (2006.01);
U.S. Cl.
CPC ...
G03B 21/2033 (2013.01); B60K 35/00 (2013.01); G02B 5/0278 (2013.01); G02B 5/208 (2013.01); G02B 5/26 (2013.01); G02B 26/10 (2013.01); G02B 26/101 (2013.01); G02B 27/0101 (2013.01); G02B 27/0977 (2013.01); G03B 21/28 (2013.01); H04N 5/74 (2013.01); B60K 2370/1529 (2019.05); B60K 2370/23 (2019.05); B60K 2370/27 (2019.05); B60K 2370/333 (2019.05); B60K 2370/334 (2019.05); B60K 2370/52 (2019.05);
Abstract

A projection display device includes: a light source that emits a first laser light for displaying a projection and a second laser light for inspection; a scanning drive mirror that reflects the first laser light and the second laser light emitted from the light source, and uses the first laser light and the second laser light in scanning; a light diffusion unit that allows the first laser light used in the scanning by the scanning drive mirror to be transmitted through the light diffusion unit and diffuses the first laser light; a light selection unit that allows the first laser light to be transmitted through the light selection unit and reflects the second laser light at a position on an emission surface of the light diffusion unit; and a light detection unit that detects the second laser light reflected by the light selection unit.

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