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. 30, 2022
Filed:
Nov. 22, 2018
Hitachi-lg Data Storage, Inc., Tokyo, JP;
Takeru Utsugi, Tokyo, JP;
Ryuji Ukai, Tokyo, JP;
HITACHI-LG DATA STORAGE, INC., Tokyo, JP;
Abstract
The present invention provides a light-guiding plate which is applicable to incident rays over a wide ray angular range and wide wavelength rage, and is able to suppress a decrease in optical efficiency. A light-guiding platehaving a light diffracting portionfor diffracting incident light by a multiple-recorded hologram is configured such that, in the light diffracting portion, when lightof a single wavelength having a certain angular range is incident, at least two or more outgoing raysare discretely emitted with a first angular space θs, and the emitted rays each have a second angular range θa, and the first angular space θs is equal to or larger than the second angular range θa.