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:
Jan. 06, 2026
Filed:
Oct. 05, 2023
Yoshifumi Sudoh, Kanagawa, JP;
Takemasa Tsutsui, Kanagawa, JP;
Yoshifumi Sudoh, Kanagawa, JP;
Takemasa Tsutsui, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
An optical system includes: a light guide to guide image light; a partial reflector; and a reflector. The partial reflector transmits a first image light guided in a first direction from a first side of the partial reflector in a light guide; and reflects second image light to exit outside from a light emission surface of the light guide, the second image light being guided in the light guide in a second direction opposite to the first direction from a second side of the partial reflector. The reflector at the second side of the partial reflector reflects the first image light back to the partial reflector as the second image light in the second direction. A dimension of the light guide in a thickness direction is longer than a beam diameter of the image light guided in the light guide. The light emission surface has a negative power.