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:
Sep. 18, 2018
Filed:
Jan. 19, 2017
Enplas Corporation, Saitama, JP;
Yuki Fujii, Saitama, JP;
ENPLAS CORPORATION, Tokyo, JP;
Abstract
A light flux controlling member includes an incidence surface, an emission surface, and an annular groove part. The annular groove part includes a first internal surface and a second internal surface. The second internal surface protrudes from a virtual line connecting an outer and inner end portions toward an opening side of the annular groove part; and, when an angle on the annular groove part side of two angles between a tangent to an arbitrary point of the second internal surface and the central axis is an inclination angle at the arbitrary point of the second internal surface in the cross section including the central axis, an inclination angle at the inner end portion is smaller than an inclination angle at the outer end portion, and an inclination angle of the second internal surface increases as a distance from the central axis increases.