Lighting apparatus with enhanced capability of heat dissipation

• US 20030072153A1
• Filed: 09/17/2002
• Published: 04/17/2003
• Est. Priority Date: 09/18/2001
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nagai, Hideo, Matsui, Nobuyuki, Tamura, Tetsushi
• Granted Patent: US 6,857,767 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/3511 Warping
• CPC Class Codes: H01L 33/64 Heat extraction or cooling elements
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 1/0281 Reinforcement details thereof
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/2009 Reinforced areas, e.g. for a specific part of a flexible printed circuit
• CPC Class Codes: H05K 3/0061 onto a metallic substrate, e.g. a heat sink heat sinks for electric apparatus H05K7/20
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A plurality of groups of Light Emitting Diodes (LEDs), each group being made up of three LEDs with red, green, and blue luminous colors respectively, are mounted at positioning areas of a flexible substrate, on the wiring patterns formed on the top surface of the substrate. A plurality of heat dissipation boards are adhered to the bottom surface of the substrate using an adhesive so as to cover the areas corresponding to the positioning areas of the groups of LEDs.

Claims

1. A lighting apparatus comprising:

a substrate that is flexible;

light emitting elements mounted on a first main surface of the substrate;

heat dissipating members attached so as to be in intimate contact with a second main surface of the substrate, wherein

each of the heat dissipating members is at least as large as each of positioning areas of the light emitting elements on the substrate, and

each of the heat dissipating members is positioned so as to cover and reinforce one or more of areas of the second main surface that correspond to the positioning areas.

2. The lighting apparatus of claim 1, wherein

the light emitting elements form groups each made up of a predetermined number, and

the heat dissipating members are adhered at areas corresponding to the positioning areas of the groups.

3. The lighting apparatus of claim 2, wherein

each of the groups includes at least two light emitting elements that have mutually different luminous colors.

4. The lighting apparatus of claim 3, wherein

the groups of light emitting elements are positioned at intervals in two directions on the substrate.

5. The lighting apparatus of claim 4, wherein

the groups of light emitting elements are positioned substantially in a matrix formation.

6. The lighting apparatus of claim 5, wherein

the light emitting elements are LEDs.

7. The lighting apparatus of claim 6, wherein

each of the groups is made up of three LEDs with luminous colors of red, green, and blue respectively.

8. The lighting apparatus of claim 7, wherein

the three LEDs in each of the groups are positioned at each of vertexes of a substantially regular triangle.

9. A lighting apparatus comprising:

a substrate that is flexible;

light emitting elements mounted on a first main surface of the substrate;

one or more heat dissipating members attached so as to be in intimate contact with a second main surface of the substrate, wherein

each of the heat dissipating members is at least as large as each of positioning areas of the light emitting elements on the substrate, and

the heat dissipating members have at least one removal area being less stiff than other areas in an area that corresponds to a non-positioning area of the substrate in which no light emitting elements are mounted.

10. The lighting apparatus of claim 9, wherein

the light emitting elements form groups each made up of a predetermined number, and

the removal area is in an area that corresponds to the non-positioning area of each of the groups.

11. The lighting apparatus of claim 10, wherein

the groups of light emitting elements are positioned at substantially regular intervals in two directions on the substrate, and

the removal area is in an area that corresponds to an area between the positioning areas of the groups.

12. The lighting apparatus of claim 10, wherein

the groups of light emitting elements are positioned at substantially regular intervals in two directions on the substrate, and

the removal area is in an area that corresponds to an area inside a square whose vertexes are four of the positioning areas of the groups.

13. The lighting apparatus of claim 10, wherein

the heat dissipating members have one or more openings within the removal area.

14. The lighting apparatus of claim 10, wherein

each of the groups includes at least two LEDs that have mutually different luminous colors.

15. The lighting apparatus of claim 11, wherein

the groups of light emitting elements are positioned substantially in a matrix formation.

16. The lighting apparatus of claim 14, wherein

each of the groups is made up of three LEDs with luminous colors of red, green, and blue respectively.

17. The lighting apparatus of claim 16, wherein

the three LEDs in each of the groups are positioned at each of vertexes of a substantially regular triangle.