LED Lighting Fixture

• US 20080101063A1
• Filed: 10/26/2007
• Published: 05/01/2008
• Est. Priority Date: 10/27/2006
• Status: Active Grant

• Current Assignee: Stanley Electric Company Limited
• Original Assignee: Stanley Electric Company Limited
• Inventors: Owada, Ryotaro, Okada, Hidetaka, Koike, Teruo, Bamba, Shoichi
• Granted Patent: US 7,857,497 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21S 2/00 Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
• CPC Class Codes: F21S 8/088 with lighting device mounted on top of the standard, e.g. for pedestrian zones
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 31/00 Gas-tight or water-tight arrangements
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21W 2131/10 Outdoor lighting
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21W 2131/105 of arenas or the like
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED lighting fixture is provided which achieves effective use of light, uniformly illuminates a large area and, has a high degree of freedom in designing light distribution characteristics. Three types of LED optical modules are used each having different light distribution characteristics. Each LED optical module includes an LED light source and a light distribution controlling lens of a different shape which constitute an optical system. Three types of LED optical units having different light distribution characteristics can be used. Each LED optical unit includes a set of LED optical modules having the same light distribution characteristics. The LED lighting fixture is configured to have a combination of the LED optical units having different light distribution characteristics.

Claims

1. An LED lighting fixture comprising:

a set of LED optical units having different light distribution characteristics, respectively, and each of the LED optical units including at least one LED optical module configured to emit light forming a corresponding light distribution characteristic, the at least one LED optical module including an LED serving as a light source and at least one light distribution controlling lens located in an illumination direction of the LED light source, wherein

the at least one LED optical module includes at least one first LED optical module mounted to a first LED optical unit, the at least one first LED optical module configured to form a first light distribution characteristic, and the at least one LED optical module includes at least one second LED optical module mounted to a second LED optical unit, the at least one second LED optical module configured to form a second light distribution characteristic, wherein the first light distribution characteristic and the second light distribution characteristic are different from each other.

2. The LED lighting fixture according to claim 1, wherein the LED optical units are configured in such a manner that a portion of an area to be illuminated by the LED lighting fixture and located at a first position close to the LED lighting fixture is illuminated by at least one first LED optical unit having a wide light distribution characteristic when the lighting fixture is operated, and a portion of the area that is located at a second position further from the lighting fixture as compared to the first position is illuminated when the lighting fixture is operated by at least one second LED optical unit having a narrow light distribution characteristic as compared to the wide light distribution characteristic of the at least one first LED optical unit.

3. The LED lighting fixture according to claim 1, wherein the light distribution controlling lens includes an incident surface upon which light from the LED is incident and a light-emitting surface from which the light is emitted from the controlling lens to an area outside of the controlling lens, the incident surface and the light-emitting surface both being curved in the illumination direction relative to the LED to form a substantially convex profile;

the light distribution controlling lens has a focal point substantially at the LED; and

the light-emitting surface includes a plurality of continuous free curved surfaces differing in shape.

4. The LED lighting fixture according to claim 2, wherein the light distribution controlling lens includes an incident surface upon which light from the LED is incident and a light-emitting surface from which the light is emitted from the controlling lens to an area outside of the controlling lens, the incident surface and the light-emitting surface both being curved in the illumination direction relative to the LED to form a substantially convex profile;

the light distribution controlling lens has a focal point substantially at the LED; and

the light-emitting surface includes a plurality of continuous free curved surfaces differing in shape.

5. The LED lighting fixture according to claim 3, wherein the light-emitting surface of the light distribution controlling lens has a shape that refracts light in a designated direction in a continuous manner according to an incident angle of the light from the focal point of the light distribution controlling lens.

6. The LED lighting fixture according to claim 4, wherein the light-emitting surface of the light distribution controlling lens has a shape that refracts light in a designated direction in a continuous manner according to an incident angle of the light from the focal point of the light distribution controlling lens.

7. The LED lighting fixture according to claim 1, wherein the at least one controlling lens of the at least one first LED optical module includes a first light distribution controlling lens and a second light distribution controlling lens, and the first light distribution controlling lens is shaped differently from the second light distribution controlling lens.

8. An LED lighting fixture comprising:

at least one first LED optical unit including a first housing and at least one first LED optical module located in the first housing and configured to emit light forming a first light characteristic; and

at least one secondary LED optical unit including a secondary housing and at least one secondary LED optical module located in the secondary housing and configured to emit light forming a secondary light characteristic, the secondary light characteristic being different from the first light characteristic, wherein

the at least one first LED optical module includes a first LED serving as a first light source and includes a first light characteristic controlling lens located in an illumination direction of the first LED light source, and the at least one secondary LED optical module includes a secondary LED serving as a secondary light source and includes a secondary light characteristic controlling lens located in an illumination direction of the secondary LED light source, the secondary light characteristic controlling lens being shaped differently from the first light characteristic controlling lens.

9. The LED lighting fixture according to claim 8, wherein the at least one first LED optical module includes a plurality of first LED optical modules, and the at least one secondary LED optical module includes a plurality of secondary LED optical modules.

10. The LED lighting fixture according to claim 8, wherein the at least one first LED optical unit is configured to emit light having a wide light distribution characteristic towards a first area close to the LED light fixture, and the at least one secondary LED optical unit is configured to emit light having a narrow light distribution characteristic towards a secondary area located further from the LED light fixture than the first area.

11. The LED lighting fixture according to claim 8, wherein the first light characteristic controlling lens includes a first incident surface upon which light from the first LED is incident and a first light-emitting surface from which light is emitted from the first controlling lens to an area outside of the first controlling lens, the first light-emitting surface being curved in an illumination direction relative to the first LED to form a substantially convex surface facing away from the first LED.

12. The LED lighting fixture according to claim 11, wherein the first light characteristic controlling lens has a first focal point substantially at the first LED;

and

the first light-emitting surface includes a plurality of continuous free curved surfaces differing in shape.

13. The LED lighting fixture according to claim 11, wherein the secondary light characteristic controlling lens includes a secondary incident surface upon which light from the secondary LED is incident and a secondary light-emitting surface from which light is emitted from the secondary controlling lens to an area outside of the secondary controlling lens, the secondary light-emitting surface being curved in an illumination direction relative to the secondary LED to form a substantially convex surface facing away from the secondary LED.

14. The LED lighting fixture according to claim 13, wherein the secondary light characteristic controlling lens has a secondary focal point substantially at the secondary LED;

and

the secondary light-emitting surface includes a plurality of continuous free curved surfaces differing in shape.

15. The LED lighting fixture according to claim 12, wherein the first light-emitting surface of the first light characteristic controlling lens has a shape that refracts light in a designated direction in a continuous manner according to an incident angle of light from the first focal point of the first light characteristic controlling lens.

16. The LED lighting fixture according to claim 14, wherein the secondary light-emitting surface of the secondary light characteristic controlling lens has a secondary shape that refracts light in a secondary designated direction in a continuous manner according to an incident angle of light from the secondary focal point of the secondary light characteristic controlling lens.

17. The LED lighting fixture according to claim 8, wherein the first light characteristic is a first light distribution pattern and the secondary light characteristic is a secondary light distribution pattern.