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:
Apr. 11, 2017
Filed:
Feb. 19, 2015
Yukimi Nishi, Tokyo, JP;
Naoyuki Ishikawa, Kanagawa, JP;
Satoshi Tsuchiya, Kanagawa, JP;
Akihisa Mikawa, Kanagawa, JP;
Hideo Kanai, Tokyo, JP;
Tetsuya Fujioka, Kanagawa, JP;
Masamichi Yamada, Kanagawa, JP;
Yasunari Mikutsu, Tokyo, JP;
Yoshio Kubo, Tokyo, JP;
Yukimi Nishi, Tokyo, JP;
Naoyuki Ishikawa, Kanagawa, JP;
Satoshi Tsuchiya, Kanagawa, JP;
Akihisa Mikawa, Kanagawa, JP;
Hideo Kanai, Tokyo, JP;
Tetsuya Fujioka, Kanagawa, JP;
Masamichi Yamada, Kanagawa, JP;
Yasunari Mikutsu, Tokyo, JP;
Yoshio Kubo, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image projection apparatus including a light source, a projection unit to project light from the light source, a dust-proof member to protect the projection unit from outside dust and through which light from the light source passes, a light detector provided at an end surface of the dust-proof member to detect reflected light of light projected from the projection unit, the reflected light being internally reflected light trapped within the dust-proof member, and a controller that executes a protective action when the amount of internally reflected light detected by the light detector meets or exceeds a predetermined threshold value.