Illuminated line of light using point light source

• US 5,590,945 A
• Filed: 07/26/1995
• Issued: 01/07/1997
• Est. Priority Date: 07/26/1995
• Status: Expired due to Term

• Current Assignee: Tall Tower Led, LLC
• Original Assignee: Industrial Devices, Inc.
• Inventors: Simms, Norman
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): Sember, Thomas M.
• Application Number:
  US08/507,121
• Time in Patent Office: 531 Days
• Field of Search: 0/26, 0/27, 0/31, 0/32, 0/347, 0/339, 0/348, 0/337, 0/338, 0/335, 0/336, 0/308, 0/800, 0/235, 0/80, 0/299, 0/300, 0/301, 40/544, 40/546
• US Class Current: 362/623
• CPC Class Codes: B60Q 3/20 for lighting specific fittings of passenger or driving compartments; mounted on specific fittings of passenger or driving compartments lighting for dashboards B60Q3/10
• CPC Class Codes: B60Q 3/283 Steering wheels; Gear levers
• CPC Class Codes: B60Q 3/64 for a single lighting device
• CPC Class Codes: B60Q 3/78 for generating luminous strips, e.g. for marking trim component edges
• CPC Class Codes: F21S 43/237 rod-shaped
• CPC Class Codes: F21S 43/245 emitting light from one or more of its major surfaces
• CPC Class Codes: F21S 43/249 with two or more light sources being coupled into the light guide
• CPC Class Codes: G02B 6/002 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
• 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 6/0038 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 6/0068 Arrangements of plural sources, e.g. multi-colour light sources

Abstract

A long, thin illuminated line of light is provided for highlighting components in an automotive dashboard or interior such as a cup holder or gearshift console. A point light source such as a surface mounted LED or incandescent lamp is located at one end of a light guide. An arcuate rear reflecting surface of the light guide causes total internal reflection of the light from the point light source and produces a uniform light display at a front viewing surface. The line of light can fit into deep recesses of a plastic molded console with minimal spacing (e.g., of only about 0.10 inches) between walls. The line of light can also be used for aesthetic or functional displays such as for consumer electronic equipment and industrial controls.

Claims

1. A light display device, comprising:

a light guide defining an elongated optical cavity;

said light guide having a first end and a second end;

said light guide having opposing front viewing and rear reflecting surfaces;

said rear reflecting surface being curved over at least a substantial portion of said light guide;

a plurality of reflecting ridges disposed on said rear reflecting surface;

said ridges being substantially uniformly distributed along said substantial portion of said light guide;

at least one of said reflecting ridges extending across a width of said rear reflecting surface;

means adjacent to said first end of said light guide for introducing light into said light guide;

wherein said reflecting ridges of said rear reflecting surface reflect light introduced via said introducing means toward said front viewing surface to create a light display thereon.

2. The light display device of claim 1 wherein said light introducing means are adapted to receive said light from point light source.

3. The light display device of claim 1 wherein said light introducing means are adapted to receive said light from a plurality of point light sources adjacent to said first end of said light guide and extending sequentially along a height of said light guide, said height being the distance from said rear reflecting surface to said front viewing surface, and said rear reflecting surface is adapted to reflect light from said point light sources toward said front viewing surface to provide a light display thereon.

4. The light display device of claim 1 wherein said front viewing surface is substantially planar.

5. The light display device of claim 1 wherein said front viewing surface is structured to produce a nonuniform light display.

6. The light display device of claim 1 wherein said reflecting ridges have a triangular cross-section.

7. The light display device of claim 6 wherein said rear reflecting surface is arcuate according to an inverse square law to achieve a substantially uniform light display on said front viewing surface.

8. The light display device of claim 6, wherein said ridges are substantially contiguously distributed along said rear reflecting surface.

9. The light display device of claim 6, wherein said ridges are substantially uniform in size.

10. The light display device of claim 1 further comprising means adjacent to said second end of said light guide for introducing light into said light guide for reflection by said rear reflecting surface toward said front viewing surface.

11. The light display of claim 10 wherein said means adjacent said second end are adapted to receive light from at least one point light source.

12. The light display of claim 8 wherein:

at least one of said means for introducing light comprise opposing first and second parabolic reflectors for reflecting received light into said light guide;

said opposing first and second parabolic reflectors define a receiving port therebetween, said receiving port extending substantially parallel to a longitudinal axis of said light guide from a terminus which is proximate to said first end to an opening which is distal from said first end; and

a light source for producing said light is receivable in said receiving port via said opening.

13. The light display device of claim 10 wherein said rear reflecting surface comprises a first arc for reflecting light introduced at said first end toward said front viewing surface and a second arc for reflecting light introduced at said second end toward said front viewing surface, said first and second arcs forming a V shape.

14. The light display device of claim 3 wherein said first and second arcs are arcuate according to an inverse square law to achieve a substantially uniform light display on said front viewing surface.

15. The light display device of claim 14 wherein said front viewing surface is shaped to provide a thin line of light.

16. The light display device of claim 15 wherein said light guide has a substantially rectangular cross section.

17. The light display of claim 13 wherein said rear reflecting surface is symmetrical about a central region of said V shape.

18. The light display device of claim 1 wherein said front viewing surface is shaped to provide a thin line of light.

19. The light display device of claim 1 wherein:

said means for introducing light comprise opposing first and second parabolic reflectors for reflecting received light into said light guide;

said opposing first and second parabolic reflectors define a receiving port therebetween, said receiving port extending substantially parallel to a longitudinal axis of said light guide from a terminus which is proximate to said first end to an opening which is distal from said first end; and

a light source for producing said light is receivable in said receiving port via said opening.

20. The light display device of claim 1 wherein said light guide is flexible.

21. The light display device of claim 1 further comprising a first point light source for introducing light at said first end and a second point light source for introducing light at said second end, said rear reflecting surface being symmetrical to provide a substantially uniform illumination across said front viewing surface.

22. A light display device, comprising:

a light guide defining an elongated optical cavity;

said light guide having a first end and a second end;

said light guide having opposing front viewing and rear reflecting surfaces;

said rear reflecting surface being curved over at least a substantial portion of said light guide according to an inverse square law to achieve a substantially uniform light display on said front viewing surface;

a plurality of reflecting ridges disposed on said rear reflecting surface;

at least one of said reflecting ridges extending across a width of said rear reflecting surface;

means adjacent to said first end of said light guide for introducing light into said light guide;

wherein said reflecting ridges of said rear reflecting surface reflect light introduced via said introducing means toward said front viewing surface to create a light display thereon.

23. The light display device of claim 22, wherein said ridges are substantially uniformly distributed along said rear reflecting surface.