Light emitting device

• US 8,523,384 B2
• Filed: 07/07/2010
• Issued: 09/03/2013
• Est. Priority Date: 02/20/2006
• Status: Expired due to Fees

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Nishi, Masami, Yamamoto, Atsushi
• Primary Examiner(s): GRAMLING, SEAN P
• Application Number:
  US12/831,741
• Publication Number:
  US 20100270906A1
• Time in Patent Office: 1,154 Days
• Field of Search: 362/231, 362/249.02, 362/329, 257 98-100
• US Class Current: 362/231
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48111 the wire connector extending above another semiconductor or solid-state body
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/49109 outside the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/49113 the connectors connecting different bonding areas on the semiconductor or solid-state body to a common bonding area outside the body, e.g. converging wires
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/181 Encapsulation
• CPC Class Codes: H01L 2924/1815 Shape
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A light emitting device having a simple structure and high decorating characteristics is provided.

The light emitting device comprises an emission source for outputting lights having different colors from different emission parts; and a transmitting resin having a conically shaped reflection surface for reflecting lights output from each of the emission parts, and covering the light emitting source, wherein the emission source is provided so that one or more of the emission parts are located away from a central axis of the conical shape.

Claims

1. A light emitting device comprising:

at least two electrical leads, each provided with an end portion;

an emission source, including a plurality of light emitting elements supported on an end portion of one of the electrical leads, each of the light emitting elements emitting light of a color that is different from the color of light emitted by the others of the plurality of light emitting elements; and

a transmitting resin for transmitting at least parts of individual lights output from each of the plurality of light emitting elements without blending with lights output from the others of the plurality of light emitting elements, the emission source being potted into the transmitting resin together with the end portions, the transmitting resin having a conically shaped reflection surface for reflecting the lights output from the plurality of light emitting elements, at least one of the light emitting elements being located away from a central axis of the conically shaped reflection surface;

whereby

different colors of lights reflected from the reflection surface can be discerned from different viewing directions;

wherein

at least one of the light emitting elements is supported on a surface that is angularly disposed with respect to a surface on which another of the light emitting elements is supported; and

wherein

the end portion that supports the light emitting elements includes stepped surfaces, and each of the stepped surfaces supports a different one of the plurality of light emitting elements.

2. The light emitting device according to claim 1, wherein each of the plurality of light emitting elements is supported in a position that is different from the position of the others of the plurality of light emitting elements.

3. The light emitting device according to claim 1, wherein the conical shape of the reflection surface is a polygonal cone.

4. The light emitting device according to claim 1, wherein the conical shape of the reflection surface is a circular cone.

5. The light emitting device according to claim 1, wherein an outer shape of the transmitting resin is a polygonal prism shape and a central axis of an outer shape of the transmitting resin is generally coincident with a central axis of the conical shape of the reflection surface.

6. The light emitting device according to claim 1, wherein an outer shape of the transmitting resin is a cylindrical column shape and a central axis of the cylindrical column is generally coincident with a central axis of the conical shape of the reflection surface.

7. The light emitting device according to claim 1, wherein a reflection-enhancing member is formed on the reflection surface.

8. The light emitting device according to claim 1, wherein the end portion that supports the light emitting elements is cup-shaped defining a recess formed therein.

9. A light emitting device comprising:

at least two electrical leads, each provided with an end portion;

an emission source, including a plurality of light emitting elements supported on an end portion of one of the electrical leads, each of the light emitting elements emitting light of a color that is different from the color of light emitted by the others of the plurality of light emitting elements; and

a transmitting resin for transmitting at least parts of individual lights output from each of the plurality of light emitting elements without blending with lights output from the others of the plurality of light emitting elements, the emission source being potted into the transmitting resin together with the end portions, the transmitting resin having a conically shaped reflection surface for reflecting the lights output from the plurality of light emitting elements, at least one of the light emitting elements being located away from a central axis of the conically shaped reflection surface;

whereby

different colors of lights reflected from the reflection surface can be discerned from different viewing directions; and

wherein

the conical shape of the reflection surface is a polygonal cone.

10. The light emitting device according to claim 9, wherein each of the plurality of light emitting elements is supported in a position that is different from the position of the others of the plurality of light emitting elements.

11. The light emitting device according to claim 9, wherein

each of the plurality of light emitting elements is supported on an end portion of a single electrical lead, and at least one of the light emitting elements is supported on a surface that is angularly disposed with respect to a surface on which another of the light emitting elements is supported, and

the end portion that supports the light emitting elements includes stepped surfaces, and each of the stepped surfaces supports a different one of the plurality of light emitting elements.

12. The light emitting device according to claim 9, wherein an outer shape of the transmitting resin is a cylindrical column shape and a central axis of the cylindrical column is generally coincident with a central axis of the conical shape of the reflection surface.

13. The light emitting device according to claim 9, wherein a reflection-enhancing member is formed on the reflection surface.

14. The light emitting device according to claim 9, wherein the end portion that supports the light emitting elements is cup-shaped defining a recess formed therein.

15. A light emitting device comprising:

at least two electrical leads, each provided with an end portion;

an emission source, including a plurality of light emitting elements supported on an end portion of one of the electrical leads, each of the light emitting elements emitting light of a color that is different from the color of light emitted by the others of the plurality of light emitting elements; and

a transmitting resin for transmitting at least parts of individual lights output from each of the plurality of light emitting elements without blending with lights output from the others of the plurality of light emitting elements, the emission source being potted into the transmitting resin together with the end portions, the transmitting resin having a conically shaped reflection surface for reflecting the lights output from the plurality of light emitting elements, at least one of the light emitting elements being located away from a central axis of the conically shaped reflection surface;

whereby

different colors of lights reflected from the reflection surface can be discerned from different viewing directions; and

wherein

an outer shape of the transmitting resin is a polygonal prism shape and a central axis of an outer shape of the transmitting resin is generally coincident with a central axis of the conical shape of the reflection surface.

16. The light emitting device according to claim 15, wherein each of the plurality of light emitting elements is supported in a position that is different from the position of the others of the plurality of light emitting elements.

17. The light emitting device according to claim 15, wherein

each of the plurality of light emitting elements is supported on an end portion of a single electrical lead, and at least one of the light emitting elements is supported on a surface that is angularly disposed with respect to a surface on which another of the light emitting elements is supported, and

the end portion that supports the light emitting elements includes stepped surfaces, and each of the stepped surfaces supports a different one of the plurality of light emitting elements.

18. The light emitting device according to claim 15, wherein an outer shape of the transmitting resin is a cylindrical column shape and a central axis of the cylindrical column is generally coincident with a central axis of the conical shape of the reflection surface.

19. The light emitting device according to claim 15, wherein a reflection-enhancing member is formed on the reflection surface.

20. The light emitting device according to claim 15, wherein the end portion that supports the light emitting elements is cup-shaped defining a recess formed therein.