Lamp

Patent metadata

Field	Value
Publication number	US-9279563-B2
Application number	US-201314060940-A
Country	US
Kind code	B2
Filing date	Oct 23, 2013
Priority date	Oct 30, 2012
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

Provided is a lamp configured to control an irradiation angle. The lamp includes a light emitting unit that is provided with an LED and a reflector having a reflecting surface that reflects light from the LED. The reflecting surface of the reflector is formed to have a parabolic shape in a cross-section perpendicular to an optical axis of the LED. The reflecting surface of the reflector is formed to have an elliptical shape in a cross-section parallel to the optical axis of the LED so as to condense and diffuse reflected light beams in a forward direction.

First claim

What is claimed is:

1. A lamp comprising:
a plurality of light emitting units each including a semiconductor light emitting element and a reflector having a reflecting surface that reflects light from a corresponding semiconductor light emitting element,
wherein the reflecting surface of the reflector is formed to have a parabolic shape in a cross-section perpendicular to an optical axis of the semiconductor light emitting element and to have a condensing-diffusing shape in a cross-section parallel to a plane including the optical axis of the semiconductor light emitting element and a symmetry axis of the parabolic shape so as to condense and diffuse reflected light beams in a forward direction.

2. The lamp of claim 1 , wherein two light emitting units are provided to be disposed in a substantially horizontal direction of the lamp, and
the two light emitting units are arranged such that the reflecting surfaces of respective reflectors face each other.

3. The lamp of claim 1 , wherein two light emitting units are provided to be disposed in a substantially horizontal direction of the lamp, and
the two light emitting units are arranged such that the reflecting surfaces of the reflectors are positioned back to back.

4. The lamp of claim 1 , wherein the plurality of light emitting units are provided to be disposed in a substantially vertical direction of the lamp.

5. The lamp of claim 2 , wherein the plurality of light emitting units are provided to be disposed in a substantially vertical direction of the lamp.

6. The lamp of claim 3 , wherein the plurality of light emitting units are provided to be disposed in a substantially vertical direction of the lamp.

7. The lamp of claim 1 , wherein the condensing-diffusing shape is an elliptical shape.

8. The lamp of claim 2 , wherein the condensing-diffusing shape is an elliptical shape.

9. The lamp of claim 3 , wherein the condensing-diffusing shape is an elliptical shape.

10. The lamp of claim 4 , wherein the condensing-diffusing shape is an elliptical shape.

Assignees

• Koito Mfg Co Ltd

Inventors

• Sawada Shigeo
• Shimizu Hiroto
• Nishihara Tomoya

Classifications

• F21S43/14

  Light emitting diodes [LED] · CPC title

• F21K9/60

  Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction · CPC title

• F21S43/19

  Attachment of light sources or lamp holders · CPC title

• F21K9/68

  Details of reflectors forming part of the light source · CPC title

• F21S45/48

  with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device · CPC title