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:
Aug. 20, 2019
Filed:
Jul. 11, 2018
Applicant:
Hoya Candeo Optronics Corporation, Toda-shi, Saitama, JP;
Inventor:
Yasuo Kogure, Toda, JP;
Assignee:
HOYA CANDEO OPTRONICS CORPORATION, Toda-Shi, Saitama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/12 (2006.01); G02B 27/01 (2006.01); F21V 8/00 (2006.01); C03C 3/066 (2006.01);
U.S. Cl.
CPC ...
G02B 27/0172 (2013.01); C03C 3/066 (2013.01); G02B 6/005 (2013.01); G02B 6/0026 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0136 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01);
Abstract
Provided is a light guide plate for an image display device which uses lead-free glass, has excellent color reproducibility and a light weight, and may obtain a wide viewing angle. A light guide plate for an image display device, which guides image light inputted from an image display element and outputs the image light toward a user's pupil, is configured to be made of lead-free glass having a refractive index of 1.8 or more with respect to a wavelength of the image light, and to have internal transmittance of 0.6 or more with respect to a wavelength of 400 nm when a plate thickness is 10 mm.