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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 10721446 B1

PDFFull Text
Date of Patent:
Jul. 21, 2020

Filed:

Sep. 05, 2018

Wavelength conversion element, light source apparatus, and projector

Applicant:

Seiko Epson Corporation, Tokyo, JP;

Inventor:

Toshiaki Hashizume, Okaya, JP;

Assignee:

SEIKO EPSON CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Michelle M Iacoletti

Assistant Examiner:

Magda Cruz

Int. Cl.
CPC ...
G03B 21/20 (2006.01); H04N 9/31 (2006.01); G02B 27/09 (2006.01); G02B 5/02 (2006.01); G03B 21/00 (2006.01); G02B 27/14 (2006.01); G02B 27/10 (2006.01); H01S 5/06 (2006.01); C09K 11/77 (2006.01); C09K 11/02 (2006.01); G02B 26/00 (2006.01);
U.S. Cl.
CPC ...
H04N 9/3138 (2013.01); C09K 11/02 (2013.01); C09K 11/7774 (2013.01); G02B 5/0242 (2013.01); G02B 26/008 (2013.01); G02B 27/0972 (2013.01); G03B 21/204 (2013.01); H01S 5/0609 (2013.01); H04N 9/3105 (2013.01); H04N 9/3158 (2013.01); H04N 9/3161 (2013.01); H04N 9/3164 (2013.01); G02B 27/1006 (2013.01); G02B 27/141 (2013.01); G03B 21/006 (2013.01);
Abstract

A wavelength conversion element includes a wavelength conversion layer having a first surface on which excitation light is incident, a second surface located on the side opposite the first surface, a plurality of phosphor particles that convert the excitation light in terms of wavelength to produce fluorescence, and a binder that holds the plurality of phosphor particles. The plurality of phosphor particles have a particle diameter distribution, and the minimum particle diameter in the particle diameter distribution of a plurality of the phosphor particles contained in a first region located on the side facing the first surface is greater than the minimum particle diameter in the particle diameter distribution of a plurality of the phosphor particles contained in a second region located on the side facing the second surface.

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