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:
Mar. 26, 2019
Filed:
Dec. 29, 2016
Naoki Nakamura, Saitama, JP;
Toshiaki Tokita, Kanagawa, JP;
Shiori Ohsugi, Kanagawa, JP;
Takashi Kubota, Tokyo, JP;
Naoki Nakamura, Saitama, JP;
Toshiaki Tokita, Kanagawa, JP;
Shiori Ohsugi, Kanagawa, JP;
Takashi Kubota, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A light guide includes a light-guide member including an incidence portion through which image light emitted from an image display element enters the light-guide member; an exit portion through which the image light exits the light-guide member to an outside of the light-guide member; a retroreflection portion to reverse a direction of travel of the image light guided through the light-guide member; and an extraction portion to guide the image light reversed by the retroreflection portion to the exit portion. The retroreflection portion has a plurality of surfaces.