LIGHT EMITTING DEVICE

• US 20080259598A1
• Filed: 04/11/2008
• Published: 10/23/2008
• Est. Priority Date: 04/17/2007
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: SUMITANI, Naofumi, MARUYAMA, Kiyomi
• Granted Patent: US 7,832,895 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• 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 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 2924/01322 Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
• CPC Class Codes: H01L 33/50 Wavelength conversion elements

Abstract

The device includes a blue light emitting region having a first light emitting part and a yellow light emitting region having a second light emitting part and a wavelength converting member arranged to absorb light from the second light emitting part and to convert the wavelength thereof to emit yellow light. The second light emitting part has a higher output than that of the first light emitting part. With this arrangement, output of the yellow light can be increased, so that the device can be used in an image reading apparatus with a high sensitivity.

Claims

1. A light emitting device comprising:

a blue light emitting region having a first light emitting part; and

a yellow light emitting region having a second light emitting part and a wavelength converting member arranged to absorb light from the second light emitting part and to convert the wavelength of the light from the second light emitting part to emit yellow light,

the second light emitting part having a higher output than that of the first light emitting part.

2. The light emitting device according to claim 1, wherein

the second light emitting part has a larger emitting area than the first light emitting part.

3. The light emitting device according to claim 2, wherein

the first light emitting part includes a first light emitting element, and

the second light emitting part includes a second light emitting element having a larger emitting area than the first light emitting element of the first light emitting part.

4. The light emitting device according to claim 1, wherein

the second light emitting part includes a plurality of light emitting elements.

5. The light emitting device according to claim 2, wherein

the second light emitting part includes a plurality of light emitting elements.

6. The light emitting device according to claim 1, wherein

the yellow light emitting region includes a plurality of light emitting regions spaced apart from each other with each of the light emitting regions including at least one light emitting element.

7. The light emitting device according to claim 2, wherein

the yellow light emitting region includes a plurality of light emitting regions spaced apart from each other with each of the light emitting regions including at least one light emitting element.

8. The light emitting device according to claim 4, wherein

the yellow light emitting region includes a plurality of light emitting regions spaced apart from each other with each of the light emitting regions including at least one of the light emitting elements.