Illuminating device and lighting fixture

Patent metadata

Field	Value
Publication number	US-2016146431-A1
Application number	US-201514951747-A
Country	US
Kind code	A1
Filing date	Nov 25, 2015
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

An illuminating device can include an LED element and possess the same light distribution characteristics as those of a common bulb having a coiled filament as a light emission source, and accordingly, can be used in place of such a common bulb. The illuminating device can include the LED and a mirror reflecting surface in front of the LED. The mirror reflecting surface can include a second reflecting surface formed in a substantially conical face shape with an apex at an intersection between an optical axis of the LED and the mirror reflecting surface and a conical side wall bulged inward, and a first reflecting surface formed as a concave reflecting surface recessed forward and having a first focal point disposed at or near the light emitting element and a second focal point disposed on the optical axis between the first focal point and the intersection.

First claim

What is claimed is:

1 . An illuminating device comprising:
a light emitting element having an optical axis; and a reflecting member disposed in front of the light emitting element, wherein the reflecting member is configured to include a first reflecting surface being a concave reflecting surface recessed forward, the first reflecting surface is configured to include a first focal point disposed at or near the light emitting element and a second focal point disposed on the optical axis of the light emitting element and between the first focal point and the reflecting member, and the illuminating device is configured such that light rays emitted from the light emitting element are reflected by the first reflecting surface to be converged to the second focal point and then be diffused to travel rearward.

2 . The illuminating device according to claim 1 , wherein
the reflecting member is configured to include a second reflecting surface having a substantially conical face shape with an apex at an intersection between the optical axis and the reflecting member and a conical side wall with an increased diameter as the conical side wall extends toward the light emitting element, the second reflecting surface is configured to be a convex reflecting surface projected rearward, and the first reflecting surface is formed outside of the second reflecting surface.

3 . The illuminating device according to claim 2 , wherein
the reflecting member is configured to include a third reflecting surface having a substantially inverted conical face shape inclined in the illumination direction of the light emitting element and linearly away from the optical axis, and the third reflecting surface is formed on the outer side in a radial direction than the first reflecting surface.

4 . The illuminating device according to claim 3 , further comprising a light-shielding member configured to surround the light emitting element in a region from its sideward area to its obliquely sideward area.

5 . The illuminating device according to claim 4 , wherein
the first reflecting surface is formed in a first region corresponding to a first solid angle where approximately 30% of the light rays emitted from the light emitting element can pass, the second reflecting surface can be formed in a second region corresponding to a second solid angle where approximately 10% of the light rays emitted from the light emitting element can pass, and the third reflecting surface can be formed in a third region corresponding to a third solid angle where approximately 20% of the light rays emitted from the light emitting element can pass.

6 . A lighting fixture comprising:
a housing configured to include a complex reflecting surface constituted by a plurality of reflecting surfaces; and an illuminating device disposed within the housing and including a light emitting element having an optical axis and a reflecting member disposed in front of the light emitting element, wherein the reflecting member is configured to include a first reflecting surface being a concave reflecting surface recessed forward, the first reflecting surface is configured to include a first focal point disposed at or near the light emitting element and a second focal point disposed on the optical axis of the light emitting element and between the first focal point and the reflecting member, the illuminating device is configured such that light rays emitted from the light emitting element are reflected by the first reflecting surface to be converged to the second focal point and then be diffused to travel rearward, and the diffused light rays travelling rearward are reflected by the plurality of reflecting surfaces of the complex reflecting surface of the housing forward.

7 . The lighting fixture according to claim 6 , wherein
the reflecting member is configured to include a second reflecting surface having a substantially conical face shape with an apex at an intersection between the optical axis and the reflecting member and a conical side wall with an increased diameter as the conical side wall extends toward the light emitting element, the second reflecting surface is configured to be a convex reflecting surface projected rearward,
the first reflecting surface is formed outside of the second reflecting surface, and
the light rays reflected by the second reflecting surface and travelling obliquely rearward are reflected by the plurality of reflecting surfaces of the complex reflecting surface of the housing forward.

8 . The lighting fixture according to claim 7 , wherein
the reflecting member is configured to include a third reflecting surface having a substantially inverted conical face shape inclined in the illumination direction of the light emitting element and linearly away from the optical axis, the third reflecting surface is formed on the outer side in a radial direction than the first reflecting surface, and the light rays reflected by the third reflecting surface and travelling sideward and obliquely forward are reflected by the plurality of reflecting surfaces of the complex reflecting surface of the housing forward.

9 . The lighting fixture according to claim 8 , wherein the illuminating device further includes a light-shielding member configured to surround the light emitting element in a region from its sideward area to its obliquely sideward area.

10 . The lighting fixture device according to claim 9 , wherein
the first reflecting surface is formed in a first region corresponding to a first solid angle where approximately 30% of the light rays emitted from the light emitting element can pass, the second reflecting surface can be formed in a second region corresponding to a second solid angle where approximately 10% of the light rays emitted from the light emitting element can pass, and the third reflecting surface can be formed in a third region corresponding to a third solid angle where approximately 20% of the light rays emitted from the light emitting element can pass.

Assignees

• Stanley Electric Co Ltd

Inventors

• Koizumi Shinji

Classifications

• F21K9/232 Primary

  specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb · CPC title

• F21V7/0008

  providing for indirect lighting · CPC title

• F21V7/048

  with facets structure · CPC title

• F21V7/09

  with a combination of different curvatures · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title