Edge light for panel display

• US 5,664,862 A
• Filed: 08/09/1996
• Issued: 09/09/1997
• Est. Priority Date: 11/29/1994
• Status: Expired due to Fees

• Current Assignee: Credit Managers Association Of California
• Original Assignee: Precision Lamp, Inc. (Lumen Technologies, Inc.)
• Inventors: Qiao, Yong, Dunah, Richard Edward, Redmond, William Franklin
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US08/694,833
• Time in Patent Office: 396 Days
• Field of Search: 362/31, 362/32, 362/293, 362/255, 362/369, 362/390, 362/800, 385/31, 385/88, 385/901
• US Class Current: 362/625
• CPC Class Codes: F24C 15/008 Illumination for oven cavities
• CPC Class Codes: G02B 6/001 the light being emitted along at least a portion of the lateral surface of the fibre
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/4298 coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

An edge light for projecting light into a lighting panel through an end surface of the lighting panel. The edge light includes a thin transparent optical guide member having an elongate portion and at least one end portion extending from the elongate portion. The elongate portion has a planar surface and a shaped surface generally parallel to the planar surface and configured for reflecting light within the guide member through one of the planar surface and the shaped surface. Either the planar surface or the shaped surface is positioned adjacent the end surface of the lighting panel when the edge light is used to illuminate the panel. The edge light also includes a light source positioned at the end portion for projecting light into the elongate portion of the optical guide member.

Claims

1. An edge light for projecting light into a lighting panel through an end surface of said lighting panel, said edge light comprising:

a thin transparent optical guide member having an elongate portion and at least one end portion extending from said elongate portion, said elongate portion having a planar surface and a shaped surface parallel to said planar surface, said shaped surface being configured to selectively extract light striking said shaped surface from said guide member through one of said planar surface and said shaped surface and transmit light striking said shaped surface along said light guide to provide a substantially uniform distribution of light across said one of said planar surface and said shaped surface of said elongate portion, said end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein,

a light source positioned in said opening of said end portion for projecting light into said elongate portion of said guide member,

said shaped surface including a plurality of transversely extending first and second facets formed therein, said first facets facing said end portion and said second facets facing away from said end portion, said shaped surface including a plurality of transversely extending grooves defined by adjacent ones of said first facets and said second facets and a plurality of planar portions extending between said grooves for reflecting light within said guide member along said elongate portion, said first facets being oriented at an angle relative to a plane substantially parallel to said shaped surface to transmit substantially all the light striking said first facets through said first facets and across said grooves toward the adjacent one of said second facets, said second facets being oriented at an angle relative to a plane substantially parallel to said shaped surface to reflect the transmitted light striking said second facet away from said shaped surface.

2. The edge light of claim 1 which further comprises a second end portion extending from said elongate portion opposite said at least one end portion, said second end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein, and a second light source positioned in said opening of said second end portion for projecting light-into said elongate portion of said guide member.

3. The edge light of claim 1 in which said light source is an optical fiber which transmits light from a remote light source and emits light into said optical guide.

6. The edge light of claim 1 in which at least one of said flared surfaces is inclined at an angle of 15°

to 30°

relative to the one of said planar surface and said shaped surface joined to said at least one of said flared surfaces.

7. The edge light of claim 1 in which said elongate portion has an upper surface and a lower surface joining said planar surface and said shaped surface, and which further comprises a reflector adjacent each of said shaped surface, said upper surface, and said lower surface for reflecting light back into said guide member.

8. The edge light of claim 1 in which said facets are inclined at an angle of 45°

to 67.5°

relative to a plane substantially parallel to said shaped surface for reflecting light through said shaped surface.

9. The edge light of claim 8 which further comprises a reflector adjacent said shaped surface for reflecting the emitted light back into said guide member and through said planar surface.

4. An edge light for projecting light into a lighting panel through an end surface of said lighting panel, said edge light comprising:

a thin transparent optical guide member having an elongate portion and at least one end portion extending from said elongate portion, said elongate portion having a planar surface and a shaped surface parallel to said planar surface, said shaped surface being configured for reflecting light within said guide member through one of said planar surface and said shaped surface, said end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein, and

a light source positioned in said opening of said end portion for projecting light into said elongate portion of said guide member, and

a resilient material filling said opening around said light source and coupling said light source to said end portion.

5. The edge light of claim 4 in which said resilient material is tinted to provide colored light.

10. An edge light for projecting light into a lighting panel through an end surface of said lighting panel, said edge light comprising:

a thin transparent optical guide member having an elongate portion and at least one end portion extending from said elongate portion, said elongate portion having a planar surface and a shaped surface parallel to said planar surface, said shaped surface being configured to selectively extract light striking said shaped surface from said guide member through one of said planar surface and said shaped surface and transmit light striking said shaped surface along said light guide to provide a substantially uniform distribution of light across said one of said planar surface and said shaped surface of said elongate portion, said end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein,

a light source positioned in said opening of said end portion for projecting light into said elongate portion of said guide member,

said shaped surface including a plurality of first facets facing said end portion and inclined at an angle for reflecting light through said planar surface of said elongate portion and a plurality of second facets joining adjacent ones of said first facets for transmitting light along said elongate portion.

11. The edge light of claim 10 which further comprises a second end portion extending from said elongate portion opposite said at least one end portion, said second end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein, and a second light source positioned in said opening of said second end portion for projecting light into said elongate portion of said guide member.

12. The edge light of claim 10 in which said light source is an optical fiber which transmits light from a remote light source and emits light into said optical guide.

13. The edge light of claim 10 in which at least one of said flared surfaces inclined at an angle of 15°

to 30°

relative to the one of said planar surface and said shaped surface joined to said at least one of said flared surfaces.

14. The edge light of claim 10 in which said elongate portion has an upper surface and a lower surface joining said planar surface and said shaped surface, and which further comprises a reflector adjacent each of said shaped surface, said upper surface, and said lower surface for reflecting light back into said guide member.

15. The edge light of claim 10 in which said first facets are oriented at an angle of 35°

to 45°

relative to a plane substantially parallel to said shaped surface.

16. An edge light for projecting light into a lighting panel through an end surface of said lighting panel, said edge light comprising:

a thin transparent optical guide member having an elongate portion and at least one end portion extending from said elongate portion, said elongate portion having a planar surface and a shaped surface parallel to said planar surface, said shaped surface being configured to selectively extract light striking said shaped surface from said guide member through one of said planar surface and said shaped surface and transmit light striking said shaped surface along said light guide to provide a substantially uniform distribution of light across said one of said planar surface and said shaped surface of said elongate portion, said end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein,

a light source positioned in said opening of said end portion for projecting light into said elongate portion of said guide member,

said shaped surface including a plurality of transversely extending first and second facets formed therein, said first facets facing said end portion and said second facets facing away from said end portion, said shaped surface including a plurality of transversely extending grooves defined by adjacent ones of said first facets and said second facets and a plurality of planar portions extending between said grooves for reflecting light within said guide member along said elongate portion, said facets being oriented at an angle relative to a plane substantially parallel to said shaped surface to internally reflect substantially all the light striking said facets toward said planar surface at a first angle of incidence for emission from said planar surface, said planar portions being configured for internally reflecting a substantial portion of light striking said planar portion toward said planar surface at a second angle of incidence for internal reflection by said planar surface along said guide member.

17. The edge light of claim 16 which further comprises a second end portion extending from said elongate portion opposite said at least one end portion, said second end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein, and a second light source positioned in said opening of said second end portion for projecting light into said elongate portion of said guide member.

18. The edge light of claim 16 in which said light source is an optical fiber which transmits light from a remote light source and emits light into said optical guide.

19. The edge light of claim 16 in which at least one of said flared surfaces is inclined at an angle of 15°

to 30°

relative to the one of said planar surface and said shaped surface joined to said at least one of said flared surfaces.

20. The edge light of claim 16 in which said elongate portion has an upper surface and a lower surface joining said planar surface and said shaped surface, and which further comprises a reflector adjacent each of said shaped surface, said upper surface, and said lower surface for reflecting light back into said guide member.

21. The edge light of claim 16 in which said facets are inclined at an angle of 35°

to 45°

relative to the plane defined by said shaped surface for reflecting light through said planar surface of said elongate portion.

22. An edge light for projecting light into a lighting panel through an end surface of said lighting panel, said edge light comprising:

a thin transparent optical guide member having an elongate portion and at least one end portion extending from said elongate portion, said elongate portion having a planar surface and a shaped surface parallel to said planar surface, said shaped surface being configured to selectively extract light striking said shaped surface from said guide member through one of said planar surface and said shaped surface and transmit light striking said shaped surface along said light guide to provide a substantially uniform distribution of light across said one of said planar surface and said shaped surface of said elongate portion, said end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein,

a light source positioned in said opening of said end portion for projecting light into said elongate portion of said guide member,

said shaped surface including a plurality of first facets facing said end portion and inclined at an angle of 1°

to 15°

relative to a plane defined by said shaped surface for reflecting light along said light guide and a plurality of second facets facing away from said end portion and inclined at an angle of 35°

to 55°

relative to the plane defined by said shaped surface for reflecting light through said planar surface of said elongate portion.

23. The edge light of claim 22 which further comprises a second end portion extending from said elongate portion opposite said at least one end portion, said second end portion having flared surfaces inclined outwardly relative to said planar surface and said shaped surface and an opening formed therein, and a second light source positioned in said opening of said second end portion for projecting light into said elongate portion of said guide member.

24. The edge light of claim 22 in which said light source is an optical fiber which transmits light from a remote light source and emits light into said optical guide.

25. The edge light of claim 22 in which at least one of said flared surfaces is inclined at an angle of 15°

to 30°

relative to the one of said planar surface and said shaped surface joined to said at least one of said flared surfaces.

26. The edge light of claim 22 in which said elongate portion has an upper surface and a lower surface joining said planar surface and said shaped surface, and which further comprises a reflector adjacent each of said shaped surface, said upper surface, and said lower surface for reflecting light back into said guide member.