Light-emitting device and process for producing thereof

• US 20050072981A1
• Filed: 02/19/2003
• Published: 04/07/2005
• Est. Priority Date: 02/19/2002
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Suenaga, Ryoma
• Granted Patent: US 6,924,514 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: H01L 2224/45015 being circular
• CPC Class Codes: H01L 2224/45124 Aluminium (Al) as principal constituent
• CPC Class Codes: H01L 2224/45139 Silver (Ag) as principal constituent
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• 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 2224/48465 the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/49111 the connectors connecting two common bonding areas, e.g. Litz or braid wires
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 24/45 of an individual wire connector
• 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 2924/00012 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 2924/12041 LED
• CPC Class Codes: H01L 2924/12042 LASER
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2924/207 Diameter ranges
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/52 : Encapsulations
• CPC Class Codes: H01L 33/54 : having a particular shape
• CPC Class Codes: H01L 33/58 : Optical field-shaping elements

Abstract

The light-emitting device includes a light-emitting element chip; a package having a first recessed portion thereon, in which the light-emitting chip is disposed; a transparent flexible member covering at least the recessed portion; and a transparent rigid member disposed on or above the transparent flexible member. The package has at least a first front surface extending at least outwardly above the first recessed portion; a second front surface extending outwardly above the first front surface; and a third surface as the outside of the package extending outwardly above the second front surface. The rigid member is disposed in the outline of the second front surface with at least three points of contact. The flexible member is continuously provided along the first front surface, the second front surface and the back surface of the rigid member. This light-emitting device is capable of improved reliability without deteriorating its optical characteristics.

Claims

1. A light-emitting device comprising:

a light-emitting element;

a transparent resin covering the light-emitting element chip; and

a transparent member having a back surface disposed toward the transparent resin, wherein the back surface projects toward the light-emitting element,

the transparent member has a flange portion at one side which extends outwardly, and

the side surface and a portion of a front surface of the flange portion is covered by the transparent resin.

2. The light-emitting device according to claim 1, wherein at least one portion of the back surface is proximate to the light-emitting element at one point.

3. The light-emitting device according to claim 1, wherein the back surface includes a curved surface.

4. The light-emitting device according to claim 1, wherein the back surface is formed in a convex shape.

26. The light-emitting device according to claim 1, wherein the transparent member includes a fluorescent material.

27. The light-emitting device according to claim 1, wherein the transparent resin has a laminated structure including at least two layers, and the fluorescent material is included in at least one of the at least two layers.

29. The light-emitting device according to claim 1, further comprising a package in which the light-emitting element is disposed, wherein the package has at least three truncated cone stands that support a back surface of the transparent member.

30. The light-emitting device according to claim 1, further comprising a package in which the light-emitting element is disposed, wherein the package has at least three hog-backed pillar stands having a shape similar to half of a cylinder that support a back surface of the transparent member.

5. (Cancelled)

6. A light-emitting device comprising a package having a recessed portion, in which the light-emitting element is disposed,

wherein the package has at least a first front surface extending at least outwardly above the recessed portion;

a second front surface extending outwardly above the first front surface; and

a third front surface as an outer surface of the package extending outwardly above the second front surface, and

the transparent resin is continuously provided along the first front surface, the second front surface, and a back surface of the transparent member,

the second front surface includes surfaces of at least three supporting base members provided above the first front surface and the back surface of the transparent member is in contact with the second front surface.

8. The light-emitting device according to claim 6, wherein the transparent member is disposed along the second front surface with at least three points of contact, and

the first front surface and the second front surface each have an exposed portion disposed outwardly from respective points of contact with the transparent member.

9. The light-emitting device according to claim 6, wherein the transparent member has a flange portion at a bottom end surface that extends outwardly, and

the side surface and the front surface of the flange portion contact the transparent resin.

10. The light-emitting device according to claim 9, wherein the back surface of the flange portion is parallel to and adjacent the second front surface.

11. The light-emitting device according to claim 8, wherein the outline of the second front surface is a polygonal shape with more vertexes than an outline of the transparent member.

12. The light-emitting device according to claim 11, wherein the outline of the transparent member is rounded at the points of contact.

13. The light-emitting device according to claim 6, wherein the exposed portion of the first front surface projects into a corner portion of the package.

14. The light-emitting device according to claim 8, wherein the exposed portion of the first front surface faces a corner of the second front surface.

15. The light-emitting device according to claim 8, wherein the exposed portion of the first front surface includes a portion having a rounded surface outline.

16. The light-emitting device according to claim 6, wherein:

the package is formed with a pair of lead terminals extending from a side surface, and

an inner portion of the lead terminal is disposed along the outline of the first front surface.

17. The light-emitting device according to claim 16, wherein the inner portion of the lead terminal extends in two directions inside the device.

18. The light-emitting device according to claim 16, wherein a portion of the back surface of the inner portion of the lead terminal is exposed to an opening disposed in the back surface side of the package.

19. The light-emitting device according to claim 6, wherein the package includes a metal base member having a back surface that is a mount surface,

the front surface of the metal base member is disposed in the recessed portion, and

the light-emitting element is disposed on the front surface of the metal base member.

20. The light-emitting device according to claim 19, wherein the metal base member includes lead terminals integrally attached thereto, and

an end of the metal base member projects from one side of the package.

21. The light-emitting device according to claim 19, wherein the metal base member has a first front surface exposed in the recessed portion, and a second front surface covered by the package.

22. The light-emitting device according to claim 19, wherein the metal base member has a first recessed portion provided on the front surface of the metal base member.

23. The light-emitting device according to claim 19, wherein one end portion of the pair of lead terminals are exposed from a side surface opposite to a side surface where a portion of the metal base member is exposed, and the lead terminals are parallel and spaced apart a predetermined distance.

24. The light-emitting device according to claim 19, wherein the back surface of the package has a notch portion opening at an edge facing the metal base member.

25. The light-emitting device according to claim 6, wherein:

the light-emitting element has a pair of positive and negative terminals on a first side,

the pair of terminals of the light-emitting element are connected with inner portions of the pair of the lead terminals by wires, and

the top points of the wires are positioned between the first front surface and the second front surface.

7. (Cancelled)

28. (Cancelled)

31. A light-emitting device, comprising:

a package having a recessed portion, in which a light-emitting element is disposed,

wherein the package has at least a first front surface extending at least outwardly above the recessed portion and a second front surface as an outer surface of the package extending outwardly above the first front surface, and

a transparent resin is continuously provided along the first front surface, and a back surface of the transparent member,

the first front surface includes surfaces of at least three supporting base members provided above the first front surface and the back surface of the transparent member is in contact with the first front surface.