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. 18, 2011
Filed:
Aug. 13, 2007
Tomonori Kimura, Tokyo, JP;
Eiichi Hayashi, Kanagawa, JP;
Yasuo Yamanaka, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical element having an optical surface and at least three convex portions on a surface different from the optical surface, wherein, among the at least three convex portions, two convex portions a space between whose centers is a maximum and one convex portion a length of a perpendicular from whose center to a straight line connecting centers of the two convex portions is a maximum satisfy a relationship of tan(h/p)≦a first specification value, wherein h is a greater one of heights of the optical element at centers of the two convex portions with reference to a tangential plane of the optical element at a position of a foot of the perpendicular, and p is a length of the perpendicular.