Light emitting diode device

• US 8,614,451 B2
• Filed: 09/20/2005
• Issued: 12/24/2013
• Est. Priority Date: 09/24/2004
• Status: Active Grant

• Current Assignee: Stanley Electric Company Limited
• Original Assignee: Stanley Electric Company Limited
• Inventors: Hanya, Akihiko
• Primary Examiner(s): Parekh, Nitin
• Application Number:
  US11/229,536
• Publication Number:
  US 20060065957A1
• Time in Patent Office: 3,017 Days
• Field of Search: 257 98-100, 257/676, 257432-436, 257/E23.066, 257/E25.032
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 2924/1815 Shape
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A plurality of separate lead frames can be insert-molded in a reflector composed of a white resin having a high reflectivity to form a package for an LED device. A cavity is formed in the reflector. The cavity can have an inner circumferential surface that opens wider in an upward direction. Cups can be located in the cavity. Each cup has an outer wall that can be in the form of a cylinder with the bottom formed of each of two separate lead frames. A red LED chip and a green LED chip can be adhesively fixed to the lead frames located on the bottoms of the respective cups. The LED chips can have lower electrodes, which are electrically brought into conduction with the lead frames one by one. The LED chips can also have upper electrodes, which are electrically brought into conduction with the lead frames one by one via bonding wires. A light transmissive resin can be filled in the cavity.

Claims

1. An LED device, comprising:

a reflector made of a particular material, the reflector including

a cavity formed in the reflector,

a plurality of cups formed in the cavity, and each having an outer wall integral with the reflector and a bottom, molded integrally with the reflector, and

a lead frame located adjacent the cavity and made of a material different from the particular material;

a plurality of LED chips, at least one of the plurality of LED chips located in at least one of the plurality of cups; and

a light transmissive resin located in the cavity to seal the at least one of the plurality of LED chips and the at least one of the plurality of cups.

2. The LED device according to claim 1, wherein the at least one of the plurality of cups is shaped substantially cylindrical.

3. The LED device according to claim 2, wherein the particular material includes a white resin having a high reflectivity.

4. The LED device according to claim 2, wherein the LED chips include a combination of LED chips of two or more types having different light source colors.

5. The LED device according to claim 2, further comprising:

convex lenses, wherein the plurality of LED chips each have an optical axis, and each of the convex lenses is located above a respective one of the LED chips, and each of the convex lenses has an optical axis that is substantially coincident with the optical axis of the respective one of the LED chips.

6. The LED device according to claim 1, wherein the particular material includes a white resin having a high reflectivity.

7. The LED device according to claim 6, wherein the LED chips include a combination of LED chips of two or more types having different light source colors.

8. The LED device according to claim 6, further comprising:

convex lenses, wherein the plurality of LED chips each have an optical axis, and each of the convex lenses is located above a respective one of the LED chips, and each of the convex lenses has an optical axis that is substantially coincident with the optical axis of the respective one of the LED chips.

9. The LED device according to claim 1, wherein the LED chips include a combination of LED chips of two or more types having different light source colors.

10. The LED device according to claim 9, further comprising:

convex lenses, wherein the plurality of LED chips each have an optical axis, and each of the convex lenses is located above a respective one of the LED chips, and each of the convex lenses has an optical axis that is substantially coincident with the optical axis of the respective one of the LED chips.

11. The LED device according to claim 1, further comprising:

convex lenses, wherein the plurality of LED chips each have an optical axis, and each of the convex lenses is located above a respective one of the LED chips, and each of the convex lenses has an optical axis that is substantially coincident with the optical axis of the respective one of the LED chips.

12. The LED device according to claim 1, wherein the reflector is molded from a resinous material.

13. The LED device according to claim 1, wherein the particular material is a resinous material.

14. The LED device according to claim 1, wherein the cups are located within the cavity.

15. The LED device according to claim 1, wherein the lead frame is insert-molded with the cavity.

16. The LED device according to claim 1, wherein the outer wall of the at least one of the plurality of cups is made of the particular material.

17. The LED device according to claim 1, wherein the reflector has an inner circumferential surface that is open wider at an upward location.

18. An LED device, comprising:

a reflector body made of a first material, the reflector body including a cavity and having a light emitting direction;

a plurality of cups formed in the cavity of the reflector body, and each having an outer wall integral with the reflector body and a bottom, molded integrally with the reflector, and made of the first material;

a lead frame located adjacent the cavity and made of a material different from the first material and extending continuously in a single plane from a first end of the cavity to a diametrically opposed second end of the cavity;

a plurality of LED chips, at least one of the plurality of LED chips located in at least one of the plurality of cups and located, with respect to the light emitting direction, above the single plane formed by the lead frame; and

a light transmissive resin located in the cavity to seal the at least one of the plurality of LED chips and the at least one of the plurality of cups in the cavity.

19. The LED device according to claim 18, wherein the at least one of the plurality of cups is shaped substantially cylindrical.

20. The LED device according to claim 18, wherein the reflector body is made of the first material, and the first material includes a white resin having a high reflectivity.

21. An LED device, comprising:

a reflector body made of a first material, the reflector body including a cavity and having a light emitting direction;

a plurality of cups formed in the cavity of the reflector body, and each having an outer wall integral with the reflector body and a bottom, molded integrally with the reflector body, and made of the first material;

a lead frame located adjacent the cavity and made of a material different from the first material;

a plurality of LED chips each having a bottom surface and a top surface separated by a side surface, the bottom surface being connected to the lead frame, and at least one of the plurality of LED chips being located in at least one of the plurality of cups; and

a light transmissive resin located in the cavity to seal the at least one of the plurality of LED chips and the at least one of the plurality of cups in the cavity such that the resin extends continuously and linearly from the side surface of the at least one of the LED chips to the at least one of the cups.

22. The LED device according to claim 21, wherein the at least one of the plurality of cups is shaped substantially cylindrical and the first material includes a white resin having a high reflectivity.