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:
Nov. 10, 2020
Filed:
Jul. 10, 2018
Luminous flux control member, light emitting device, surface light source device, and display device
Enplas Corporation, Kawaguchi, JP;
Toshihiko Mochida, Saitama, JP;
ENPLAS CORPORATION, Saitama, JP;
Abstract
The present invention provides a lens for a light emitting element (a luminous flux control member) that can ensure sufficient spread of light even with a smaller number of light emitting elements. The luminous flux control member () of the present invention includes: a dome shaped aspherical lens body (). The lens body () includes: a base surface (); and a dome shaped curved surface (). The base surface () has a base concave portion () centered on a central axis, a concave surface of the base concave portion () has a light incident region for incident light emitted from a light emitting element, the dome shaped curved surface () has a light emitting region for emitting incident light from the light incident region to an outside, the light emitting region of the curved surface () has an elliptical shape as viewed from a central axis direction centered on the central axis, in which a length (X) of an X axis orthogonal to the central axis and a length (Y) of a Y axis orthogonal to the central axis and the X axis satisfy X<Y, the light emitting region of the curved surface has a pair of first concave portions () on both sides with the central axis interposed therebetween in a cross section including the X axis and the central axis, and the light emitting region of the curved surface has a second concave portion () on the central axis in a cross section including the Y axis and the central axis.