Linear light source for enhancing uniformity of beaming light within the beaming light's effective focal range

• US 7,267,467 B2
• Filed: 08/22/2005
• Issued: 09/11/2007
• Est. Priority Date: 06/02/2004
• Status: Active Grant

• Current Assignee: Pixon Technologies Corp.
• Original Assignee: Pixon Technologies Corp.
• Inventors: Wu, Rong Yaw, Yen, Chih-Ming, Chen, Shih-Che
• Primary Examiner(s): Assouad; Patrick
• Assistant Examiner(s): ALLEN, DANIELLE NICOLE
• Application Number:
  US11/207,836
• Publication Number:
  US 20050276064A1
• Time in Patent Office: 750 Days
• Field of Search: None
• US Class Current: 362/555
• CPC Class Codes: H04N 1/02815 Means for illuminating the original, not specific to a particular type of pick-up head
• CPC Class Codes: H04N 1/02825 in combination with at least one reflector which is fixed in relation to the light source H04N1/02835 and H04N1/0284 take precedence
• CPC Class Codes: H04N 1/02835 in combination with a light guide, e.g. optical fibre, glass plate light-guides per se G02B6/00
• CPC Class Codes: H04N 1/0284 in combination with a light integrating, concentrating or diffusing cavity
• CPC Class Codes: H04N 1/02885 Means for compensating spatially uneven illumination, e.g. an aperture arrangement
• CPC Class Codes: H04N 1/0289 Light diffusing elements, e.g. plates or filters optical diffusing elements per se G02B5/02

Abstract

A light guide assembly as a linear light source for enhancing the uniformity of beaming light within the beaming light'"'"'s effective focal range comprising a light guide bar connected to a light source assembly and a reflective housing encasing the light guide bar. One surface of the light guide bar is a light-scattering/light-emission surface, and other surfaces are all reflective. The emission plane has gradually changing indentations for adjusting the light refractive and reflecting indexes to ensure the light uniformity. The reflective housing covering the light guide bar is used for enhancing the light reflection and intensity. An opening is formed in the reflective housing corresponding to the emission plane of the light guide bar, and a reflecting flange is formed at one side of the opening. Combined with the sloping and notched emission plane, light with high intensity and uniformity can be obtained, and the uniformity of beaming light within the beaming light'"'"'s effective focal range can also be improved.

Claims

1. A light guide assembly for enhancing uniformity of beaming light, comprising:

a polygonal cylindrical light guide bar, wherein one surface of the light guide bar is a light-scattering/light-emission surface and other surfaces are a plurality of reflecting surfaces, and at least one end of the light guide bar is a light-receiving end, wherein the light-scattering/light-emission surface comprises an indented surface;

a light source assembly connecting to said light guide bar, wherein said light source assembly includes at least one light emitting diode; and

a reflective housing encasing said light guide bar, and an emission opening in reflective sleeve formed corresponding to the light-scattering/light-emission surface; and

an angle of said indented surface is gradually increased with an incline angle of 0.03 to 0.15 degrees.

2. The light guide assembly for enhancing uniformity of beaming light of claim 1, wherein the indented surface is a gradually indented surface formed on an outside surface of the light-scattering/light-emission surface.

3. The light guide assembly for enhancing uniformity of beaming light of claim 1, wherein an opening is formed in the light source assembly corresponding to a shape of the light guide bar for fastening the light guide bar to the light source assembly.

4. The light guide assembly for enhancing uniformity of beaming light of claim 1, wherein a reflecting flange is formed at one side of the emission opening.

5. The light guide assembly for enhancing uniformity of beaming light of claim 1, wherein the light emitting diode comprises at least one light emitting diode of any color within visible or near visible light spectrum.

6. The light guide assembly for enhancing uniformity of beaming light of claim 3, wherein the light emitting diode is placed at a distance of 1.12±

0.1 centimeters in diametrical range outward from a center of the opening.

7. The light guide assembly for enhancing uniformity of beaming light of claim 1, wherein the reflective housing further comprises an upper sleeve and a lower sleeve, the upper and lower sleeves can be combined together.

8. The light guide assembly for enhancing uniformity of beaming light of claim 1, wherein an angle between a reflecting flange and a vertical axis of the emission opening is 30 to 60 degrees.

9. The light guide assembly for enhancing uniformity of beaming light of claim 2, wherein the incline angle of the indented surface is gradually and segmentally increased.

10. The light guide assembly for enhancing uniformity of beaming light of claim 1, wherein a color of the reflective housing is selected from one of white, silvery-white and silver.

11. A light guide assembly for enhancing uniformity of beaming light, comprising:

a polygonal cylindrical light guide bar, wherein one surface of the light guide bar is a light-scattering/light-emission surface and other surfaces are a plurality of reflecting surfaces, and at least one end of the light guide bar is a light-receiving end, wherein the light-scattering/light-emission surface comprises an indented surface;

a light source assembly connecting to said light guide bar, wherein said light source assembly includes at least one light emitting diode; and

a reflective housing encasing said light guide bar, and an emission opening in reflective sleeve formed corresponding to the light-scattering/light-emission surface;

an opening is formed in the light source assembly corresponding to a shape of the light guide bar for fastening the light guide bar to the light source assembly; and

the at least one light emitting diode is placed at a distance of 1.12+0.1 centimeters in diametrical range outward from a center of the opening.

12. The light guide assembly for enhancing uniformity of beaming light of claim 11, wherein the indented surface is a gradually indented surface formed on an outside surface of the light-scattering/light-emission surface.

13. The light guide assembly for enhancing uniformity of beaming light of claim 11, wherein a reflecting flange is formed at one side of the emission opening.

14. The light guide assembly for enhancing uniformity of beaming light of claim 11, wherein the light emitting diode comprises at least one light emitting diode of any color within visible or near visible light spectrum.

15. The light guide assembly for enhancing uniformity of beaming light of claim 11, wherein the reflective housing further comprises an upper sleeve and a lower sleeve, the upper and lower sleeves can be combined together.

16. The light guide assembly for enhancing uniformity of beaming light of claim 11, wherein an angle between a reflecting flange and a vertical axis of the emission opening is 30 to 60 degrees.

17. The light guide assembly for enhancing uniformity of beaming light of claim 12, wherein an angle of said indented surface is gradually increased with an incline angle of 0.03 to 0.15 degrees.

18. The light guide assembly for enhancing uniformity of beaming light of claim 12, wherein the incline angle of the indented surface is gradually and segmentally increased.

19. The light guide assembly for enhancing uniformity of beaming light of claim 11, wherein a color of the reflective housing is selected from one of white, silvery-white and silver.