LED light source device

Patent metadata

Field	Value
Publication number	US-9863602-B2
Application number	US-201514858859-A
Country	US
Kind code	B2
Filing date	Sep 18, 2015
Priority date	Sep 25, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

An LED light source device having an LED including an LED element as a light emission source and capable of possessing the same light distribution characteristics and luminance distribution as those of a common bulb having a coiled filament as a light emission source is provided. The LED light source device is also capable of providing the same light distribution pattern when it is used for a lighting fixture that utilizes a bulb as a light source, in place of a bulb. LEDs are disposed with respect to first light reflecting surfaces of paired hyperbolic cylindrical surfaces with a common focal line while LED elements of the LEDs are disposed at or near respective positions on the focal lines of the other hyperbolic cylindrical surfaces corresponding to the paired hyperbolic cylindrical surfaces.

First claim

What is claimed is:

1. An LED light source device comprising:
an LED including an LED element as a light emission source; and
a light reflecting body configured to include a light reflecting surface configured to reflect light emitted from the LED in a predetermined direction, wherein
the light reflecting surface is configured to include at least a first light reflecting surface composed of a first hyperbolic cylindrical surface,
the first hyperbolic cylindrical surface is configured to have an inner focal line inside the light reflecting body and be obtained by moving part of a hyperbolic line in a perpendicular direction to a plane including the hyperbolic line, the hyperbolic line having an outer focal point at or near a position at which the LED element is located,
the first light reflecting surface is configured to further include a second hyperbolic cylindrical surface, and
the second hyperbolic cylindrical surface is configured to have an inner focal line located at the inner focal line of the first hyperbolic cylindrical surface and be obtained by moving part of a hyperbolic line in a perpendicular direction to a plane including the hyperbolic line, the hyperbolic line having an outer focal point at a position different from the outer focal point of the hyperbolic line of the first hyperbolic cylindrical surface.

2. The LED light source device according to claim 1 , wherein
the LED comprises at least a first LED and a second LED; and
the first LED is located at or near an outer focal line obtained by moving the outer focal point of the hyperbolic line of the first hyperbolic cylindrical surface and the second LED element is located at or near an outer focal line obtained by moving the outer focal point of the hyperbolic line of the second hyperbolic cylindrical surface.

3. The LED light source device according to claim 1 , wherein:
the light reflecting surface is configured to further include a second light reflecting surface;
the second light reflecting surface is configured by a free curved surface provided so as to protrude in a direction substantially perpendicular to an optical axis of the LED element and away from the LED farther than the first light reflecting surface;
light rays emitted from the LED element within a predetermined emission angular range around the optical axis are incident on the first light reflecting surface; and
light rays emitted from the LED element by a larger angle than the predetermined emission angular range are incident on the second light reflecting surface.

4. The LED light source device according to claim 2 , wherein:
the light reflecting surface is configured to further include a second light reflecting surface;
the second light reflecting surface is configured by a free curved surface provided so as to protrude in a direction substantially perpendicular to an optical axis of the LED element and away from the LED farther than the first light reflecting surface;
light rays emitted from the LED element within a predetermined emission angular range around the optical axis are incident on the first light reflecting surface; and
light rays emitted from the LED element by a larger angle than the predetermined emission angular range are incident on the second light reflecting surface.

5. The LED light source device according to claim 1 , wherein
the LED is produced by resin-sealing an LED element with a translucent resin so as to have an aspheric light emission surface; and
the light rays emitted from the LED element to enter the translucent resin are refracted by the light emission surface of the translucent resin by means of lens effects to be bent toward an optical axis of the LED element when exiting the translucent resin.

6. The LED light source device according to claim 2 , wherein
the LED is produced by resin-sealing an LED element with a translucent resin so as to have an aspheric light emission surface; and
the light rays emitted from the LED element to enter the translucent resin are refracted by the light emission surface of the translucent resin by means of lens effects to be bent toward an optical axis of the LED element when exiting the translucent resin.

7. The LED light source device according to claim 3 , wherein
the LED is produced by resin-sealing an LED element with a translucent resin so as to have an aspheric light emission surface; and
the light rays emitted from the LED element to enter the translucent resin are refracted by the light emission surface of the translucent resin by means of lens effects to be bent toward the optical axis of the LED element when exiting the translucent resin.

8. The LED light source device according to claim 4 , wherein
the LED is produced by resin-sealing an LED element with a translucent resin so as to have an aspheric light emission surface; and
the light rays emitted from the LED element to enter the translucent resin are refracted by the light emission surface of the translucent resin by means of lens effects to be bent toward the optical axis of the LED element when exiting the translucent resin.

9. A lighting fixture comprising:
a reflector having a lighting chamber; an outer lens made of a transparent resin and configured to cover the reflector to define the lighting chamber; and
an LED light source device disposed in the lighting chamber and including: an LED including an LED element as a light emission source; and a light reflecting body configured to include a light reflecting surface configured to reflect light emitted from the LED in a predetermined direction, wherein
the light reflecting surface is configured to include at least a first light reflecting surface composed of a first hyperbolic cylindrical surface,
the first hyperbolic cylindrical surface is configured to have an inner focal line inside the light reflecting body and be obtained by moving part of a hyperbolic line in a perpendicular direction to a plane including the hyperbolic line, the hyperbolic line having an outer focal point at or near a position at which the LED element is located,
the first light reflecting surface is configured to further include a second hyperbolic cylindrical surface, and
the second hyperbolic cylindrical surface is configured to have an inner focal line located at the inner focal line of the first hyperbolic cylindrical surface and be obtained by moving part of a hyperbolic line in a perpendicular direction to a plane including the hyperbolic line, the hyperbolic line having an outer focal point at a position different from the outer focal point of the hyperbolic line of the first hyperbolic cylindrical surface.

10. The lighting fixture according to claim 9 , wherein
the LED comprises at least a first LED and a second LED; and
the first LED is located at or near an outer focal line obtained by moving the outer focal point of the hyperbolic line of the first hyperbolic cylindrical surface and the second LED element is located at or near an outer focal line obtained by moving the outer focal point of the hyperbolic line of the second hyperbolic cylindrical surface.

11. The lighting fixture according to claim 9 , wherein
the light reflecting surface is configured to further include a second light reflecting surface;
the second light reflecting surface is configured by a free curved surface provided so as to protrude in a direction substantially perpendicular to an optical axis of the LED element and away from the LED farther than the first light reflecting surface;
light rays emitted from the LED element within a predetermined emission angular range around the optical axis are incident on the first light reflecting surface; and
light rays emitted from the L

Assignees

• Stanley Electric Co Ltd

Inventors

• Hiki Satoru

Classifications

• F21K9/232

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

• F21S43/31

  Optical layout thereof · CPC title

• F21V7/0033

  with successive reflections from one reflector to the next or following · CPC title

• F21S43/20

  characterised by refractors, transparent cover plates, light guides or filters · CPC title

• F21V7/0008

  providing for indirect lighting · CPC title