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:
Aug. 23, 2011
Filed:
Jul. 22, 2009
Go Takahashi, Ebina, JP;
Eiichi Hayashi, Atsugi, JP;
Kan Aoki, Yamato, JP;
Masafumi Furusawa, Atsugi, JP;
Takamichi Ohhashi, Yokohama, JP;
Go Takahashi, Ebina, JP;
Eiichi Hayashi, Atsugi, JP;
Kan Aoki, Yamato, JP;
Masafumi Furusawa, Atsugi, JP;
Takamichi Ohhashi, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A plastic optical element for guiding a scanned light beam in a main scanning direction and a sub-scanning direction, which is prepared by a molding method using a die. The element includes: a main body including at least two optically functional surfaces, which are transfer surfaces formed by contacted with transfer surfaces of the die and through which the light beam passes; and at least two ribs located on surfaces of the main body other than the optically functional surfaces and extending in parallel in the main scanning direction. A recessed portion is present on a surface of at least one of the ribs, and the recessed portion has a side transfer surface and a bottom surface, which is a non-transfer surface, and the distance between the optically functional surfaces is less than the length of the main body in the sub-scanning direction.