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. 20, 2011
Filed:
Feb. 28, 2008
Kensuke Masuda, Kodaira, JP;
Tomohiro Nakajima, Machida, JP;
Satoru Itoh, Yokohama, JP;
Daisuke Ichii, Kawasaki, JP;
Masahiro Soeda, Kawasaki, JP;
Yoshinori Hayashi, Kawasaki, JP;
Kensuke Masuda, Kodaira, JP;
Tomohiro Nakajima, Machida, JP;
Satoru Itoh, Yokohama, JP;
Daisuke Ichii, Kawasaki, JP;
Masahiro Soeda, Kawasaki, JP;
Yoshinori Hayashi, Kawasaki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A light-amount detecting device includes: a light source which emits a light beam; a branching optical element which divides the light beam emitted from the light source into a first light beam traveling in a predetermined direction and a second light beam traveling in a direction different to the predetermined direction; a light-condensing element which condenses the second light beam; a light-receiving element having a light-receiving surface which receives the second light beam condensed by the light-condensing element; and a detector which detects a light-amount of the second light beam received by the light-receiving element, and at least one of a direction of reflected light of the second light beam reflected from the light-receiving surface of the light-receiving element and spread of the reflected light of the second light beam reflected from the light-receiving surface of the light-receiving element is adjusted to control a light-amount of the reflected light of the second light beam returning to the light source.