Flexible circuit board, electronic circuit device, and mobile communication terminal

• US 20060128346A1
• Filed: 12/13/2005
• Published: 06/15/2006
• Est. Priority Date: 12/13/2004
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Yasui, Kenichiro
• Granted Patent: US 7,551,449 B2
• Time in Patent Office: Days
• US Class Current: 455/333
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/2009 Reinforced areas, e.g. for a specific part of a flexible printed circuit
• CPC Class Codes: H05K 3/0058 Laminating printed circuit boards onto other substrates, e.g. metallic substrates H05K1/0281 takes precedence

Abstract

The flexible circuit board according to the present invention includes a plurality of mounting portions which are mounted with electronic circuits respectively, a connector portion that performs signal transmission between the electronic circuit mounted on each of the mounting portions and the electronic circuit device, and coupling portions that couple the respective mounting portions to the connector portion in different directions. The flexible circuit board is mounted on the electronic circuit device in a state of being folded at a predetermined part of one of the coupling portions.

Claims

1. A flexible circuit board mounted on an electronic circuit device, comprising:

a plurality of mounting portions which are mounted with electronic circuits, respectively;

a connector portion that performs signal transmission between the electronic circuit mounted on each of the mounting portions and the electronic circuit device; and

coupling portions that couple the respective mounting portions to the connector portion in different directions,

wherein the flexible circuit board is mounted on the electronic circuit device in a state of being folded at a predetermined part of one of the coupling portions.

2. The flexible circuit board according to claim 1, wherein the flexible circuit board is movable in a rotational direction thereof with the bent predetermined part as a starting point.

3. The flexible circuit board according to claim 1, wherein the bent predetermined part is provided with a notch or notches at one or both of end portions thereof.

4. The flexible circuit board according to claim 1, wherein the flexible circuit board is mounted on the electronic circuit device in a state in which the predetermined part is bent such that the electronic circuits are overlapped with each other in a two-dimensional manner.

5. The flexible circuit board according to claim 1, wherein the flexible circuit board is received in the electronic circuit device in a state in which the predetermined part is bent such that the electronic circuits are overlapped with each other in a three-dimensional manner.

6. The flexible circuit board according to claim 1, wherein reinforcing members is bonded to each of the mounting portions.

7. The flexible circuit board according to claim 1, wherein the electronic circuits are mounted only on one surface of the flexible circuit board.

9. An electronic circuit device mounted with electronic circuits using the flexible circuit board according to any one of claims 1 to 7.

10. A mobile communication terminal mounted with electronic circuits using the flexible circuit board according to any one of claims 1 to 7.

8. A method of mounting a flexible circuit board that includes:

a plurality of mounting portions which are mounted with electronic circuits respectively;

a connector portion that performs signal transmission between the electronic circuit mounted on each of the mounting portions and the electronic circuit device; and

coupling portions that couple the respective mounting portions to the connector portion in different directions, the method comprising the steps of;

folding the flexible circuit board at a predetermined part of one of the coupling portions; and

mounting the flexible circuit board on the electronic circuit device while moving the flexible circuit board in a rotational direction thereof with the predetermined part as a starting point.