Substrate for mounting light emitting element, light emitting module and lighting apparatus

• US 7,982,230 B2
• Filed: 12/10/2007
• Issued: 07/19/2011
• Est. Priority Date: 06/13/2005
• Status: Expired due to Fees

• Current Assignee: Fujikura Limited
• Original Assignee: Fujikura Limited
• Inventors: Masuko, Koichiro
• Primary Examiner(s): Gebremariam; Samuel A
• Application Number:
  US11/953,522
• Publication Number:
  US 20080258169A1
• Time in Patent Office: 1,317 Days
• Field of Search: 257 98-100, 257/E29.072, 257/E33.008
• US Class Current: 257/98
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• 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 33/64 Heat extraction or cooling elements
• CPC Class Codes: H05K 1/053 the metal substrate being covered by an inorganic insulating layer
• CPC Class Codes: H05K 1/117 Pads along the edge of rigid circuit boards, e.g. for pluggable connectors
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]

Abstract

A substrate for mounting light emitting elements having two or more conductive layers and an insulating layer provided between each conductive layer, which are formed on the outside of an enameled substrate, the enameled substrate being an enamel layer covering the surface of a core metal. The conductive layer provided on the enamel layer side links one end of enameled substrate to the other end, and feeds power to a plurality of light emitting elements mounted in the longitudinal direction of the conductive layer. Furthermore, the conductive layer on the surface of a protruding section provided at both ends of the enameled substrate extends and forms a connection with another substrate. A light emitting module is formed by mounting light emitting elements on the substrate.

Claims

1. A substrate for mounting light emitting elements, comprising:

an enameled substrate in which a surface of a core metal is covered with an enamel layer;

two or more conductive layers formed on an outer surface of the enameled substrate; and

an insulating layer provided between every two of the conductive layers, wherein the conductive layers extend along a longitudinal direction of the enameled substrate from a first end to a second end such that the conductive layers feed power to a plurality of light emitting elements mounted along the longitudinal direction of the enameled substrate, and such that the conductive layers form a laminate structure together with the insulating layer sandwiched therebetween;

wherein the first and second end of the enameled substrate have at least one protruding section, wherein a first one of the conductive layers extends on a surface of a respective protruding section provided at each of the first and second ends of the enameled substrate to connect with another substrate, wherein a first portion of a second one of the conductive layers, on which the light emitting elements are mounted, is directly formed on the enamel layer which covers the surface of the core metal, and wherein a second portion of the second one of the conductive layers is mounted on top of the first one of the conductive layers via the insulating layer.

2. The substrate for mounting light emitting elements as recited in claim 1, wherein a groove is provided in the enameled substrate, and the first portion of the second one of the conductive layers extends within the groove such that the position for mounting the light emitting element is within the groove.

3. A light emitting module comprising light emitting elements which are mounted on the substrate for mounting light emitting elements as recited in claim 1.

4. A lighting apparatus comprising the light emitting module as recited in claim 3.

5. The substrate for mounting light emitting elements as recited in claim 1, wherein the second one of the conductive layers is Z-shaped in top view.