Heat radiating apparatus and electronic apparatus

• US 20070131409A1
• Filed: 03/06/2006
• Published: 06/14/2007
• Est. Priority Date: 12/14/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Asahi, Kazutoshi
• Granted Patent: US 7,630,201 B2
• Time in Patent Office: Days
• US Class Current: 165/287
• CPC Class Codes: G05D 23/19 characterised by the use of electric means G05D23/1393 takes precedence
• CPC Class Codes: G06F 1/203 for portable computers, e.g. for laptops
• CPC Class Codes: G06F 1/206 comprising thermal management
• CPC Class Codes: H01L 23/467 by flowing gases, e.g. air H01L23/473 takes precedence
• 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

Abstract

While one of ventilation fans operates, the other ventilation fan is at rest. Air flows from the operating ventilation fan to the ventilation fan at rest. The airflow passes through an air passage defined in a heat radiating member located between the ventilation fans. Dust cumulates at the entrance of the air passage. The other ventilation fan is then driven to operate while the operating ventilation fan is brought to rest. Airflow is generated in the reverse direction. The airflow is inverted within the air passage. The inverted airflow serves to remove the dust from the entrance of the air passage. The cumulation of the dust can thus reliably be avoided. Accordingly, no dust filter is required in the path of airflow outside the air passage. Airflow of a sufficient amount can always be maintained in the air passage.

Claims

1. A heat radiating apparatus comprising:

at least a pair of ventilation fans;

a heat radiating member received on a heat generating object in a space between the ventilation fans, said heat radiating member defining an air passage extending between the ventilation fans; and

a controller circuit generating a control signal allowing an alternation of the ventilation fans.

2. The heat radiating apparatus according to claim 1, wherein the controller circuit times operation of the ventilation fans for generation of the control signal.

3. An electronic apparatus comprising:

an enclosure;

an electronic component disposed in the enclosure;

at least a pair of ventilation fans disposed in the enclosure;

a heat radiating member received on the electronic component in a space between the ventilation fans, said heat radiating member defining an air passage extending between the ventilation fans; and

a controller circuit generating a control signal allowing an alternation of the ventilation fans.