Light emitting device, illumination apparatus including the same, and mounting substrate

• US 9,488,345 B2
• Filed: 12/18/2014
• Issued: 11/08/2016
• Est. Priority Date: 12/20/2013
• Status: Expired due to Fees

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Abe, Masumi, Ogata, Toshifumi, Ishimori, Atsuyoshi, Sugiura, Kenji, Wada, Yasufumi
• Primary Examiner(s): Truong, Bao Q
• Application Number:
  US14/574,952
• Publication Number:
  US 20150176820A1
• Time in Patent Office: 691 Days
• US Class Current: 1/1
• CPC Class Codes: F21V 19/002 the fastening means engaging the encapsulation or the packaging of the semiconductor device
• CPC Class Codes: F21V 19/0025 the fastening means engaging the conductors of the light source, i.e. providing simultaneous fastening of the light sources and their electric connections
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• 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 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/181 Encapsulation
• 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
• CPC Class Codes: H05K 1/0274 Optical details, e.g. printed circuits comprising integral optical means H05K1/0269 takes precedence; coupling light guides with opto-electronic components G02B6/42
• CPC Class Codes: H05K 1/029 having a programmable lay-out, i.e. adapted for choosing between a few possibilities
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10287 Metal wires as connectors or conductors
• CPC Class Codes: H05K 2201/2054 Light-reflecting surface, e.g. conductors, substrates, coatings, dielectrics
• CPC Class Codes: H05K 3/222 Completing of printed circuits by adding non-printed jumper connections printed jumper connections H05K3/4685
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence

Abstract

A light emitting device includes: a substrate; a plurality of light emitting elements mounted in a light emitting area of the substrate, and an intermediate line for electrically connecting a plurality of light emitting elements in parallel or series selectively, the intermediate line being disposed in the light emitting area.

Claims

1. A light emitting device comprising:

a substrate;

a plurality of first light emitting elements connected in series and mounted on the substrate;

a plurality of second light emitting elements connected in series and mounted on the substrate;

an intermediate line disposed above the substrate and for electrically connecting the plurality of first and second light emitting elements in parallel or series selectively;

a pair of supply terminals disposed above the substrate;

a first supply line electrically connected to a supply terminal of the pair of supply terminals and disposed above the substrate; and

a second supply line electrically connected to the other supply terminal of the pair of supply terminals and disposed above the substrate, wherein;

at least two of the plurality of first light emitting elements are linearly configured to form a first element string;

at least two of the plurality of second light emitting elements are linearly configured to form a second element string; and

the intermediate line has;

an end connectable to one of the first light emitting elements at a leading end or a tail end of the first element string; and

another end connectable to one of the second light emitting elements at a tail end or a leading end of the second element string.

2. The light emitting device according to claim 1, further comprising a plurality of sealing members linearly disposed above the substrate, wherein the plurality of first light emitting elements in the first element string are collectively sealed by one of the plurality of sealing members, and the plurality of second light emitting elements in the second element string are collectively sealed by a different one of the plurality of sealing members.

3. The light emitting device according to claim 2, wherein the plurality of sealing members are disposed in parallel to the straight portion.

4. The light emitting device according to claim 3, wherein the plurality of sealing members each have a lateral side portion covering a lateral side portion of the straight portion.

5. The light emitting device according to claim 2, wherein the straight portion is covered with an insulating film.

6. The light emitting device according to claim 2, wherein the plurality of sealing members each include a wavelength conversion material.

7. The light emitting device according to claim 1, wherein the intermediate line includes, at each of the end and the another end, a first connection pad to which a wire is connected, the first supply line and the second supply line each include, at an end, a second connection pad to which a wire is connected, the first connection pad at the end of the intermediate line is disposed between the second connection pad of the first supply line and the one of the second light emitting elements at the leading end or the tail end of the second element string, and the first connection pad at the another end of the intermediate line is disposed between the second connection pad of the second supply line and the one of the first light emitting elements at the tail end or the leading end of the first element string.

8. The light emitting device according to claim 1, wherein the intermediate line includes, at an end, a first connection pad which is connected to one of the first light emitting elements or one of the second light emitting elements via a wire, and the first connection pad is disposed between an adjacent pair of the first light emitting elements or between an adjacent pair of the second light emitting elements.

9. The light emitting device according to claim 1, wherein an adjacent pair of the plurality of first light emitting elements is connected via a wire, and an adjacent pair of the plurality of second light emitting elements is connected via a wire.

10. The light emitting device according to claim 1, wherein the plurality of first light emitting elements and the plurality of second light emitting elements are disposed in a same orientation in top view.

11. The light emitting device according to claim 1, wherein a common power supply provides power to the plurality of first light emitting elements and the plurality of second light emitting elements.

12. An illumination apparatus comprising:

the light emitting device according to claim 1; and

a base to which the light emitting device is attached.

14. The light emitting device according to claim 1, wherein the first and second plurality of light emitting elements are mounted in a light emitting area of the substrate, and the intermediate line is disposed in the light emitting area.

13. A mounting substrate comprising:

a substrate upon which a plurality of first light emitting elements connected in series and a plurality of second light emitting elements connected in series are mounted;

an intermediate line, above the substrate, for electrically connecting the first and second plurality of light emitting elements in parallel or series selectively;

a pair of supply terminals disposed above the substrate;

a first supply line electrically connected to one supply terminal of the pair of supply terminals and disposed above the substrate; and

a second supply line electrically connected to the other supply terminal of the pair of supply terminals and disposed above the substrate, wherein;

at least two of the plurality of first light emitting elements are linearly configured to form a first element string;

at least two of the plurality of second light emitting elements are linearly configured to form a second element string; and

the intermediate line has a straight portion linearly disposed between the first element string and the second element string, and has;

an end connectable to one of the first light emitting elements at a leading end or a tail end of the first element string; and

the other end connectable to one of the second light emitting elements at a tail end or a leading end of the second element string.

15. The mounting substrate to claim 13, wherein the first and second plurality of light emitting elements are mounted in a light emitting area of the substrate, and the intermediate line is disposed in the light emitting area.