Light-emitting device and lighting apparatus incorporating same

• US 8,400,051 B2
• Filed: 01/13/2009
• Issued: 03/19/2013
• Est. Priority Date: 01/18/2008
• Status: Active Grant

• Current Assignee: Ushio Denki Kabushiki Kaisha (Ushio Incorporated)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation), Ushio Denki Kabushiki Kaisha (Ushio Incorporated)
• Inventors: Hakata, Kunihiko, Matsuoka, Tomomi
• Primary Examiner(s): Patel, Nimeshkumar
• Assistant Examiner(s): Hollweg, Thomas A
• Application Number:
  US12/352,721
• Publication Number:
  US 20090184618A1
• Time in Patent Office: 1,526 Days
• Field of Search: 313/499, 313/501, 313/502, 313/506, 313/512, 313/110, 313/318.02, 313/318.05, 313/503, 313/504
• US Class Current: 313/110
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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 2924/00 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 2924/3025 Electromagnetic shielding
• CPC Class Codes: H01L 33/52 Encapsulations
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin

Abstract

A light-emitting device is provided that can extract light in all directions and that has wide directivity. This light-emitting device includes: an elongated bar-shaped package extending sideways, the package being formed such that a plurality of leads are formed integrally with a first resin with part of the leads exposed; a light-emitting element that is fixed onto at least one of the leads and that is electrically connected to at least one of the leads; and a second resin sealing the light-emitting element. In the light-emitting device, the first resin and the second resin are formed of optically transparent resin, and the leads have outer lead portions used for external connection and protruding sideways from both left and right ends of the package.

Claims

1. A light-emitting device comprising:

an elongated bar-shaped package with left and right ends, the package being formed such that a plurality of leads are formed integrally with a first resin with part of the leads exposed;

a light-emitting element that is fixed onto at least one of the leads and that is electrically connected to at least one of the leads; and

a second resin sealing the light-emitting element,

wherein the leads are formed of metal,

an entire bottom surface of the light-emitting element is covered with at least one of the leads,

an entire bottom surface of the package is covered with the first resin,

the first resin has a side wall that is integrally formed with a portion covering the bottom surface of the package and that is higher than upper surfaces of the leads,

the first resin and the second resin are formed of optically transparent resin,

the second resin that is filled to a to of the side wall of the first resin and that includes a fluorescent material having a larger specific gravity than that of the second resin,

the leads have outer lead portions that are used for external connection and that protrude in a longitudinal direction of the package from the left and right ends

wherein the fluorescent material is arranged to concentrate near the light emitting element, and is excited by part of light emitted by the light-emitting element so as to emit a color different from a color of the light emitted by the light-emitting element, and

the side wall transmits part of light that is emitted by the light-emitting element and that enters the side wall and part of light emitted from the fluorescent material to the portion covering the bottom surface of the package.

2. A lighting apparatus comprising:

a plurality of light-emitting devices that are provided as the light-emitting device of claim 1;

a filament including the light-emitting devices; and

power supply leads electrically connected to the filament,

wherein the filament is so configured that adjacent ones of outer lead portions are firmly attached and connected in series such that adjacent ones of the light-emitting devices are V-shaped, and both ends of the outer lead portions connected in series are firmly attached to the power supply leads.

3. The lighting apparatus of claim 2,

wherein, in at least one of the plurality of light-emitting devices,

the fluorescent material is excited by part of light emitted by the light-emitting element so as to emit a color different from a color of the light emitted by the light-emitting element, and

the side wall transmits part of light that is emitted by the light-emitting element and that enters the side wall and part of light emitted from the fluorescent material to the portion covering the bottom surface of the package.

4. The lighting apparatus of claim 3,

wherein at least one of the plurality of light-emitting devices comprises:

a plurality of the light-emitting elements; and

a pair of the side walls, and

the plurality of the light-emitting elements are fixed, in positions away from each other, onto at least one of the leads, between the pair of the side walls, in the longitudinal direction of the package.

5. The light-emitting device of claim 1, further comprising:

a plurality of the light-emitting elements; and

a pair of the side walls,

wherein the plurality of the light-emitting elements are fixed, in positions away from each other, onto at least one of the leads, between the pair of the side walls, in the longitudinal direction of the package.