US 9,803,829 B2Granted

Light distribution lens

AssigneesAsahi Rubber Inc., Nichia Corporation

InventorsTakayuki Motoyanagi, Munetomo Nakamura, Masutsugu Tasaki, Hiroki Oguro

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Abstract

A lens for light emitting lamps that use light emitting elements such as LEDs, etc., is provided. The lens has a specific surface shape for light-distribution control to achieve desired light distributions, as well as a light emitting device using said lens. On the lens surface of the light emitting side which has a double-peak shape to obtain a light distribution characteristic having long and short two axes, by possessing a straight-line part in the surface shape of the light emitting side viewed on the lens short-axis cross section, a desired smoothly-diffused light distribution having a longitudinal direction with a certain width is obtained. The lens may be designed to have a surface of the light emitting side comprising a collection of straight lines parallel to the lens short-axis cross section, or to have a continuous curved surface comprising a collection of straight lines parallel to the lens short axis.

Claims22

Dependent claims

A light distribution lens to be placed on a light emitting element, having a light incident side facing the light emitting element and a light emitting side opposite to the light incident side, wherein

a planar shape formed by the outline of the lens viewed from the light emitting side has a long axis on the light incident side of the lens and a short axis perpendicular to the long axis on the same plane, and wherein the lens central optical axis passing through the light source center of the light emitting element from the light incident side to the light emitting side is perpendicular to each of said long axis and short axis at their intersection, and
the lens surface of the light emitting side has the following three-dimensional surface shape:
in the lens long-axis cross section which is a lens's cross section taken along the plane including the long axis and the lens central optical axis, said shape is concave at and near the lens central optical axis, and is convex at both of its lateral sides, and in the lens short-axis cross section which is a lens's cross section taken along the plane including the short axis and the lens central optical axis, said shape has a straight-line part at and near the lens central optical axis and the length of the straight-line part is 5% or more relative to the length of the short axis, and is convex at both of its lateral sides.

Dependencies are inferred from the claim text.

Facts

Application: 14/672,061Filed 27 Mar 2015
Priority: JP 2014-06918628 Mar 2014
Published: US 2015/0276170 A11 Oct 2015
Granted: 31 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F21V 5/04
Refractors for light sources: of lens shape
G02B 19/0014
Having refractive surfaces only: at least one surface having optical power
G02B 19/0061
For use with a light source: the light source comprising a LED
F21Y 2115/10
Light-generating elements of semiconductor light sources: light-emitting diodes [LED]