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:
Dec. 31, 2024
Filed:
Jul. 19, 2021
Yoshifumi Sudoh, Kanagawa, JP;
Naoki Nakamura, Saitama, JP;
Masahiro Itoh, Kanagawa, JP;
Susumu Momma, Kanagawa, JP;
Shun Okazaki, Kanagawa, JP;
Shigenobu Hirano, Kanagawa, JP;
Yasuo Katano, Kanagawa, JP;
Kenji Kameyama, Kanagawa, JP;
Norikazu Igarashi, Kanagawa, JP;
Aino Hasegawa, Kanagawa, JP;
Takashi Maki, Kanagawa, JP;
Masamichi Yamada, Kanagawa, JP;
Takemasa Tsutsui, Kanagawa, JP;
Yoshifumi Sudoh, Kanagawa, JP;
Naoki Nakamura, Saitama, JP;
Masahiro Itoh, Kanagawa, JP;
Susumu Momma, Kanagawa, JP;
Shun Okazaki, Kanagawa, JP;
Shigenobu Hirano, Kanagawa, JP;
Yasuo Katano, Kanagawa, JP;
Kenji Kameyama, Kanagawa, JP;
Norikazu Igarashi, Kanagawa, JP;
Aino Hasegawa, Kanagawa, JP;
Takashi Maki, Kanagawa, JP;
Masamichi Yamada, Kanagawa, JP;
Takemasa Tsutsui, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A propagation optical system includes: a first optical system; an intermediate optical element; and a second optical system. The first optical system, the intermediate optical element, and the second optical system being sequentially arranged in a direction from the image display element toward the light guide member along an optical axis. The intermediate optical element has a non-rotationally symmetric curved surface, of which shape is non-rotationally symmetric about the optical axis. A cross-sectional shape, of the non-rotationally symmetric curved surface, in a first plane including the optical axis is non-arc shape. The first plane is a plane in which the non-rotationally symmetric surface has a strongest positive power among planes including the optical axis. The propagation optical system is configured to form, between the first optical system and the second optical system, an intermediate image corresponding to an image displayed on the image display element.