Metal-based print board formed with radiators

• US 7,969,740 B2
• Filed: 03/10/2010
• Issued: 06/28/2011
• Est. Priority Date: 08/24/2007
• Status: Active Grant

• Current Assignee: Nakamura Seisakusho Kabushikigaisha
• Original Assignee: Nakamura Seisakusho Kabushikigaisha
• Inventors: Miyahara, Hideyuki
• Primary Examiner(s): Chervinsky; Boris L
• Application Number:
  US12/720,739
• Publication Number:
  US 20100202112A1
• Time in Patent Office: 475 Days
• Field of Search: None
• US Class Current: 361/704
• CPC Class Codes: B21J 5/068 Shaving, skiving or scarifying for forming lifted portions, e.g. slices or barbs, on the surface of the material
• CPC Class Codes: F28F 3/048 in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 1/056 the metal substrate being covered by an organic insulating layer
• CPC Class Codes: H05K 2201/0382 Continuously deformed conductors
• CPC Class Codes: H05K 2203/0195 Tool for a process not provided for in H05K3/00, e.g. tool for handling objects using suction, for deforming objects, for applying local pressure
• CPC Class Codes: H05K 2203/0323 Working metal substrate or core, e.g. by etching, deforming
• CPC Class Codes: H05K 3/44 Manufacturing insulated metal core circuits or other insulated electrically conductive core circuits H05K3/0058, H05K3/4608, and H05K3/4641 take precedence
• CPC Class Codes: Y10T 428/12493 Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]

Abstract

In a metal-based print board formed with radiators, a metal foil is affixed to a front surface of a metal plate having good thermal conductivity, an insulating adhesive layer interposed therebetween. A radiator is integrally provided on a reverse surface of the metal plate, the radiator having a plurality of thin radiating fins formed upright in a tabular shape due to having been dug out by an excavating tool. The radiating fins give the radiator a large area over which heat can be released. The thickness of a first metal plate portion formed between adjacent radiating fins is less than the original thickness of the metal plate. Heat generated by an electronic component or another component provided on a side of the front surface of the metal plate is rapidly transmitted from the reduced-thickness first metal plate portion of the metal plate to each of the radiating fins of the radiator on the reverse surface side, and efficiently released from each of the radiating fins, which have a large area over which heat is radiated.

Claims

1. A metal-based print board formed with radiators, comprising:

a thermally conductive metal plate having a prescribed plate thickness;

a metallic foil affixed to a first surface of the metal plate with an adhesive layer interposed therebetween; and

a radiator integrally formed on a second surface of the metal plate that is on an opposite side of the first surface, wherein

the radiator has a plurality of tabular radiating fins, formed upright on the second surface of the metal plate at prescribed intervals by using an excavating tool to dig into the second surface;

each of the radiating fins gradually decreases in thickness from a base end portion connected to the second surface towards a distal end, and curves from the base end portion to the distal end;

a spacing between adjacent radiating fins gradually increases from the base end portion towards the distal end; and

the metal plate is configured so that a thickness is smaller in a first metal plate portion between each of the radiating fins of the radiator than in a second metal plate portion of the metal plate excluding the radiator.

2. The metal-based print board with radiators according to claim 1, wherein the radiator is surrounded by the second metal plate portion.

3. The metal-based print board formed with radiators according to claim 1, which has at least a first radiator and a second radiator, wherein each of the first radiator and the second radiator is surrounded by the second metal plate portion.

4. The metal-based print board formed with radiators according to claim 1, which has at least a first radiator and a second radiator, wherein a third metal plate portion that is thinner than the second metal plate portion is formed between the first radiator and the second radiator.

5. The metal-based print board formed with radiators according to claim 4, wherein the third metal plate portion is formed from one end to the other end of the metal plate, and the third metal plate portion is of a thickness allowing bending or curving.

6. The metal-based print board formed with radiators according to claim 1, wherein the radiator is formed from one end to the other end of the metal plate in the widthwise direction of the radiating fin, and the first metal plate portion of the radiator is of a thickness allowing bending or curving.

7. The metal-based print board formed with radiators according to claim 1 or 2, wherein a mounting position relating to a heat-generating electronic component whose heat is to be released is defined on a surface of the metallic foil;

and the radiator is formed on a portion on the second surface facing the mounting position.

8. The metal-based print board formed with radiators according to any of claim 3, 4, or 5, wherein at least a first mounting position and a second mounting position relating to a heat-generating electronic component whose heat is to be released are defined on a surface of the metallic foil;

and each of the first radiator and the second radiator is formed on portions on the second surface facing the first mounting position and second mounting position, respectively.