Light-guide type illumination device

• US 8,415,865 B2
• Filed: 11/08/2011
• Issued: 04/09/2013
• Est. Priority Date: 01/18/2011
• Status: Active Grant

• Current Assignee: Lite-On Electronics Company Limited (Lite-On Technology Corporation)
• Original Assignee: Lite-On Technology Corporation, Silitek Electronic Company Limited (Lite-On Technology Corporation)
• Inventors: Liang, Chun-Wei, LEE, CHUNG-EN
• Primary Examiner(s): Patel, Vip
• Application Number:
  US13/291,184
• Publication Number:
  US 20120182757A1
• Time in Patent Office: 518 Days
• Field of Search: 313/46, 313/493, 313/634, 313/635
• US Class Current: 313/46
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21V 19/0035 the fastening means being capable of simultaneously attaching of an other part, e.g. a housing portion or an optical component
• CPC Class Codes: F21V 19/0055 by screwing
• CPC Class Codes: F21V 29/767 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21Y 2103/37 U-shaped
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0006 Coupling light into the fibre in general G02B6/4298
• 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 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide

Abstract

A light-guide type illumination device includes a heat-dissipating unit, a conductive unit, a light-emitting unit and a light-guiding unit. The heat-dissipating unit includes a heat-dissipating body. The conductive unit and the light-emitting unit are respectively disposed on a first side and a second side of the heat-dissipating body. The light-emitting unit includes at least one light-emitting element electrically connected to the conductive unit for generating light beams. The light-guiding unit includes at least one light-guiding element disposed above the light-emitting unit. The light-guiding element has a light input surface formed on a bottom side thereof for receiving the light beams and an optical surface-treated layer formed on at least one lateral surface thereof. Hence, the instant disclosure can provide an annular 360-degree light-emitting range by matching the light-emitting unit and the light-guiding unit, thus any type of conventional energy-saving bulb can be replaced by the illumination device.

Claims

1. A light-guide type illumination device, comprising:

a heat-dissipating unit including a heat-dissipating body;

a conductive unit disposed on a first side of the heat-dissipating body;

a light-emitting unit disposed on a second side of the heat-dissipating body, wherein the light-emitting unit includes at least one light-emitting element electrically connected to the conductive unit for generating light beams; and

a light-guiding unit including at least one light-guiding element disposed above the light-emitting unit, wherein the at least one light-guiding element has a light input surface formed on a bottom side thereof for receiving the light beams and a surface-treated optical layer formed on at least one lateral surface thereof.

2. The light-guide type illumination device of claim 1, wherein the at least one light-emitting element is a LED package structure.

3. The light-guide type illumination device of claim 1, wherein the other lateral surfaces of the at least one light-guiding element are connected to one another sequentially to form a light output surface, and the surface-treated optical layer is a light-reflecting layer corresponding to the light output surface for reflecting the light beams.

4. The light-guide type illumination device of claim 3, wherein the light-reflecting layer is composed of a plurality of micro light-guiding structures, and each micro light-guiding structure is one of a convex body and a concave body.

5. The light-guide type illumination device of claim 1, wherein the other lateral surfaces of the at least one light-guiding element are connected to one another sequentially to form a light output surface, and the surface-treated optical layer is a light-scattering layer corresponding to the light output surface for uniformly scattering the light beams.

6. The light-guide type illumination device of claim 5, wherein the at least one light-guiding element has a recessed portion formed on the bottom side thereof, the light input surface is a refracting surface formed on an inner surface of the recessed portion, and the at least one light-guiding element has a surrounding total reflection inclined surface connected to the inner surface of the recessed portion and surrounding the recessed portion.

7. The light-guide type illumination device of claim 5, wherein the light-scattering layer is a white paint layer formed by coating white paints with high scattering material on the at least one lateral surface of the at least one light-guiding element.

8. The light-guide type illumination device of claim 1, wherein the at least one light-guiding element is a U-shaped solid light-guiding bar, and the at least one light-guiding element has two ends facing the at least one light-emitting element.

9. The light-guide type illumination device of claim 1, wherein the at least one light-guiding element is a U-shaped solid light-guiding bar having a cuspate top formed on the top portion thereof, and the at least one light-guiding element has two ends facing the at least one light-emitting element.

10. The light-guide type illumination device of claim 1, wherein the at least one light-guiding element is a hexagonal prism having a hexagonal cross-section, and the surface-treated optical layer faces an assembly axis of the light-guide type illumination device.

11. The light-guide type illumination device of claim 1, further comprising:

a positioning unit including a positioning body disposed on the light-emitting unit, at least one through hole passing through the positioning body and corresponding to the at least one light-emitting element, and at least one retaining groove corresponding to the at least one through hole.

12. The light-guide type illumination device of claim 11, wherein the at least one light-guiding element includes at least one retaining portion formed on the bottom side thereof and retained inside the at least one retaining groove for positioning the bottom side of the at least one light-guiding element to face the at least one light-emitting element.

13. The light-guide type illumination device of claim 1, further comprising:

a cover unit including a cover body mated with the heat-dissipating unit to enclose the light-emitting unit and an opening passing through the cover body, wherein the at least one light-guiding element passes through the opening of the cover unit.

14. A light-guiding unit for a LED light source device, comprising:

at least one U-shaped light-guiding element, wherein the at least one U-shaped light-guiding element has a light input surface formed on a bottom side thereof for receiving light beams generated by a LED light source of the LED light source device and a surface-treated optical layer formed on at least one lateral surface thereof.

15. The light-guiding unit of claim 14, wherein the other lateral surfaces of the at least one U-shaped light-guiding element are connected to one another sequentially to form a light output surface, and the surface-treated optical layer is a light-reflecting layer corresponding to the light output surface for reflecting the light beams.

16. The light-guiding unit of claim 15, wherein the light-reflecting layer is composed of a plurality of micro light-guiding structures, and each micro light-guiding structure is one of a convex body and a concave body.

17. The light-guiding unit of claim 14, wherein the other lateral surfaces of the at least one U-shaped light-guiding element are connected to one another sequentially to form a light output surface, and the surface-treated optical layer is a light-scattering layer corresponding to the light output surface for uniformly scattering the light beams.

18. The light-guiding unit of claim 17, wherein the at least one U-shaped light-guiding element has a recessed portion formed on the bottom side thereof, the light input surface is a refracting surface formed on an inner surface of the recessed portion, and the at least one U-shaped light-guiding element has a surrounding total reflection inclined surface connected to the inner surface of the recessed portion and surrounding the recessed portion.

19. The light-guiding unit of claim 17, wherein the light-scattering layer is a white paint layer formed by coating white paints with high scattering material on the at least one lateral surface of the at least one U-shaped light-guiding element.

20. The light-guiding unit of claim 14, wherein the at least one U-shaped light-guiding element has a cuspate top formed on the top portion thereof, and the at least one U-shaped light-guiding element has two ends facing the LED light source.

21. The light-guiding unit of claim 14, wherein the at least one U-shaped light-guiding element is a hexagonal prism having a hexagonal cross-section.

22. The light-guiding unit of claim 14, wherein the at least one U-shaped light-guiding element includes at least one retaining portion formed on the bottom side thereof.