Electronic device

• US 7,864,535 B2
• Filed: 08/15/2008
• Issued: 01/04/2011
• Est. Priority Date: 09/10/2007
• Status: Active Grant

• Current Assignee: Toshiba Client Solutions CO., Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Tanaka, Makoto
• Primary Examiner(s): CHERVINSKY, BORIS LEO
• Application Number:
  US12/192,852
• Publication Number:
  US 20090067134A1
• Time in Patent Office: 872 Days
• Field of Search: None
• US Class Current: 361/719
• CPC Class Codes: G06F 1/183 Internal mounting support structures, e.g. for printed circuit boards, internal connecting means for buses G06F13/409
• CPC Class Codes: G06F 1/20 Cooling means
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 2201/066 Heatsink mounted on the surface of the PCB heatsink inserted in the PCB H05K2201/10416
• CPC Class Codes: H05K 2201/09063 Holes or slots in insulating substrate not used for electrical connections
• CPC Class Codes: H05K 2201/10409 Screws

Abstract

According to one embodiment, a heat sink includes an extended end screwed to a printed circuit board. The extended end includes a screw hole and an engagement projection. A notch is formed by cutting the side of the printed circuit board to a position at which the notch does not interfere with signal lines. The notch is engaged with an engagement projection extending from the extended end, thereby preventing the heat sink from rotating when the heat sink is screwed to the printed circuit board.

Claims

1. An electronic device incorporating a printed circuit board which is contained in a casing and provided with a heat-generating electronic component,

the printed circuit board comprising:

a signal layer including a signal line which extends along a side of the printed circuit board;

a ground layer having conductive foil grounded and superposed on the signal line via an insulating layer;

a screw hole for screwing, to the printed circuit board, a heat dissipation member in a state in which the heat dissipation member is kept in contact with the electronic component; and

a notch formed by cutting the side to a position at which the notch does not interfere with the signal line, and configured to receive an engagement projection extending from the heat dissipation member, to prevent the heat dissipation member from rotating when the heat dissipation member is screwed to the printed circuit board.

2. The electronic device of claim 1, wherein the screw hole includes a screw hole formed in the printed circuit board between the side and the signal line at a position at which the screw hole does not interfere with the signal line.

3. The electronic device of claim 2, wherein the conductive foil is provided at a certain distance to an edge of the notch, and at a certain distance to an edge of the screw hole formed adjacent to the notch.

4. The electronic device of claim 1, wherein the notch is formed in a slim slit extending substantially perpendicular to the side, and receives the engagement projection extending from the heat dissipation member and formed like a plate, to prevent the engagement projection from moving along the side.

5. The electronic device of claim 1, wherein the notch includes an engagement edge extending substantially parallel to the side and engaged with the engagement projection to prevent the engagement projection from moving substantially perpendicularly along the side.

6. The electronic device of claim 5, further comprising a second notch formed in a slim slit and extending substantially perpendicular to the engagement edge, the second notch receiving a second engagement projection, different from the engagement projection, extending from the heat dissipation member to prevent the second engagement projection from moving along the side.