Reflector with negative focal length

• US 7,217,010 B2
• Filed: 03/25/2005
• Issued: 05/15/2007
• Est. Priority Date: 12/29/2004
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Hsu, Hsiu-Chen, Lin, Jian-Shian, Hsieh, Min-Lung
• Primary Examiner(s): Luebke; Renee
• Assistant Examiner(s): APENTENG, JESSICA MCMILLAN
• Application Number:
  US11/088,792
• Publication Number:
  US 20060139933A1
• Time in Patent Office: 781 Days
• Field of Search: 362/297, 362/300, 362/305, 362/346, 362/347
• US Class Current: 362/300
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21V 7/09 with a combination of different curvatures
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A luminaire with reflector of negative focal length is disclosed, which comprises a light source and a luminaire screen having a reflector of negative focal length, a side screen and a plate; wherein the reflector of negative focal length is capable of reflecting the upward-incident rays emitted from the light source; and the side screen is capable of reflecting the sideward-incident rays emitted from the light source and the reflected rays of the reflector; and the plate being disposed at the lower portion of the luminaire screen beneath the light source has a plurality of micro-structures arranged thereon and is capable of accepting the rays of the downward incident area along with both the reflected rays of the reflector and the side screen so as to diffuse the same for discharging. By the luminaire screen of the invention, the rays emitting from the light source of the luminaire are reflected and directed to a preferred discharging area so as to enable the rays to be discharged out of the luminaire by large angles for reducing glare.

Claims

1. A luminaire with reflector of negative focal length, comprising:

a light source and a luminaire screen having a reflector of negative focal length, and a side screen, wherein the reflector of negative focal length is capable of reflecting the upward-incident rays emitting from the light source, and the side screen is capable of accepting the sideward-incident rays emitting from the light source and the reflected rays of the reflector for reflecting the same, wherein the luminaire is configured to evenly emit light directly from the side screen.

2. The luminaire of claim 1, wherein the overall shape of the luminaire is selected from the group consisting of a symmetric shape and an asymmetric shape with respect to the characteristics of the light source, and a metal reflective surface with reflective index ranged between 0 and 1 is attached onto the surfaces of both the reflector and the side screen.

3. The luminaire of claim 1, wherein the reflector of negative focal length is made of a negative lens selected from a group consisting of a symmetric lens and an asymmetric lens.

4. The luminaire of claim 1, wherein the reflector of negative focal length is selected from the group consisting of a reflector of multiple focal points and a reflector of single focal point.

5. The luminaire of claim 1, wherein the side screen further comprises a plurality of microstructures arranged on the surface thereof, each microstructure being a diffuse point of a shape selected from the group consisting of diamond, sphere, column, and irregular shapes.

6. The luminaire of claim 1, wherein the light source is a lighting means selected from the group consisting of a means of single light source, a means of multiple light sources;

and the light source is selected from the group consisting of point light sources and bar light sources, the point light source being selected from the group consisting of high intensity discharge (HID) lamps and light emitting diodes (LED) the bar light source being selected from the group consisting of cold cathode fluorescent lamps (CCFL) and fluorescent lamps.

7. The luminaire of claim 1, wherein the reflector is a curved reflector.

8. The luminaire of claim 1, further comprising a plate with a plurality of microstructures disposed thereon, being disposed at the lower portion of the luminaire screen beneath the light source, capable of accepting the downward-incident rays emitting from the light source along with both the reflected rays of the reflector and the side screen so as to diffuse the same for discharging.

9. The luminaire of claim 8, wherein the microstructures on the surface of the side screen are disposed by a manner selected from the group consisting of apart from one another by an equal interval and apart from one another by different intervals, so as to regulate the amount of rays discharging from the side screen.

10. The luminaire of claim 8, wherein the plural microstructures disposed on the surface of the plate are formed by a manner selected from the group consisting of integrally formed with the plate and doped the plate with micro particles.

11. The luminaire of claim 8, wherein the plural microstructures are disposed on the plate at a position selected from the group consisting of the top surface of the plate, the bottom surface of the plate, and both.

12. The luminaire of claim 8, wherein the plate is made of a material selected from the group consisting of Polycarbonate (PC), Polymethylmethacrylate (PMMA), and Polyethylene Terephthalate (PET).

13. The luminaire of claim 8, wherein each microstructure of the plate is a diffuse point of a shape selected from the group consisting of diamond, sphere, column, and irregular shapes.

14. The luminaire of claim 8, wherein the microstructures on the surface of the plate are disposed by a manner selected from the group consisting of apart from one another by an equal interval and apart from one another by different intervals, so as to regulate the amount of rays discharging from the plate.

15. The luminaire of claim 8, wherein the plate is a Fresnel lens for diffusing the incident rays thereon.

16. The luminaire of claim 8, wherein the reflector is a planar reflector.