US5484012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic apparatus having cooling system
Assignee: Fujitsu Ltd
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Filing: 1994-12-15
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Granted: 1996-01-16
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Expires: 2014-12-15
Abstract
Abstract An electronic apparatus having a housing in which at least a heat source is housed, the housing being provided with an intake port and an exhaust port, the electronic apparatus comprising a cooling fan mounted in the exhaust port, an auxiliary cooling fan placed near the heat source, a first control portion for controlling a revolving speed of the cooling fan in accordance with a temperature of intake air, and a second control portion for controlling a revolving speed of the auxiliary cooling fan in a first mode when the revolving speed of the cooling fan is less than a reference speed and in a second mode when the revolving speed of the cooling fan is greater than the reference speed, the revolving speed of the auxiliary cooling fan controlled in the first mode being greater than the revolving speed of the auxiliary cooling fan controlled in the second mode.
Inventors
- 👤 Yoshiaki Hiratsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:04
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/20009; H05K7/20136; F; F04; F04D; F04D25/00; F04D25/16; F04D25/166; F04D27/00; F04D27/004; G; G11; G11B; G11B33/00; G11B33/14; G11B33/1406; G11B33/1413; G11B33/142; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
146 words
An electronic apparatus having a housing in which at least a heat source is housed, said housing being provided with an intake port and an exhaust port, the electronic apparatus comprising: a first cooling fan mounted in the exhaust port; a second cooling fan placed near said heat source; a first control means for controlling a revolving speed of said first cooling fan; and a second control means for controlling a revolving speed of said second cooling fan in a first mode when the revolving speed of said first cooling fan is less than a reference speed and in a second mode when the revolving speed of said first cooling fan is greater than the reference speed, the revolving speed of said second cooling fan controlled in the first mode being greater than the revolving speed of said second cooling fan controlled in the second mode.
Claim 2
Dependent Claim
146 words
An electronic apparatus having a housing in which at least a heat source is housed, said housing being provided with an intake port and an exhaust port, the electronic apparatus comprising: a first cooling fan mounted in the exhaust port; a second cooling fan placed near said heat source; a first control means for controlling a revolving speed of said first cooling fan; and a second control means for controlling a revolving speed of said second cooling fan in a first mode when the revolving speed of said first cooling fan is less than a reference speed and in a second mode when the revolving speed of said first cooling fan is greater than the reference speed, the revolving speed of said second cooling fan controlled in the first mode being greater than the revolving speed of said second cooling fan controlled in the second mode.
Claim 3
Dependent Claim
54 words
The electronic apparatus as claimed in claim 1, wherein said second control means has means for controlling the revolving speed of said second cooling fan at a first speed in the first mode and means for controlling the revolving speed of said second cooling fan at a second speed less than the first speed.
Claim 4
Dependent Claim
19 words
The electronic apparatus as claimed in claim 2, wherein the first speed and the second speed are constant values.
Claim 5
Dependent Claim
33 words
The electronic apparatus as claimed in claim 2, wherein the first speed is a variable value which is increased in accordance with a decrease of the revolving speed of said first cooling fan.
Claim 6
Dependent Claim
26 words
The electronic apparatus as claimed in claim 2, wherein the second speed is zero so that the second cooling fan is stopped in the second mode.
Claim 7
Dependent Claim
150 words
The electronic apparatus as claimed in claim 1, wherein said second control means has: first signal generating means for generating a first control signal; second signal generating means for generating a second control signal; determination means for determining whether the revolving speed of the first cooling fan is less or greater than the reference speed; means for driving said second cooling fan at a first revolving speed based on the first control signal from said first signal generating means when said determination means determines that the revolving speed of said first cooling fan is less than the reference speed; and means for driving said second cooling fan at a second revolving speed less than the first revolving speed based on the second control signal from said second signal generating means when said determination means determines that the revolving speed of said first cooling fan is greater than the reference speed.
Claim 8
Dependent Claim
47 words
The electronic apparatus as claimed in claim 6, wherein the first speed at which said second cooling fan is driven based on the first control signal and the second speed at which said second cooling fan is driven based on the second control signal are constant values.
Claim 9
Dependent Claim
22 words
The electronic apparatus as claimed in claim 7, wherein the second speed is zero so that said second cooling fan is stopped.
Claim 10
Dependent Claim
45 words
The electronic apparatus as claimed in claim 6, wherein the first speed at which said second cooling fan is drive based on the first control signal is a variable value increased in accordance with a decrease of the revolving speed of said first cooling fan.
Claim 11
Dependent Claim
151 words
The electronic apparatus as claimed in claim 1, wherein said first control means controls the revolving speed of said first cooling fan so that the revolving speed of said first cooling fan is increased in accordance with an increase of a temperature of intake air taken into said housing through the intake port, and wherein said second control means has: determination means for determining whether the temperature of the intake air is less or greater than a reference temperature corresponding to the reference speed; means for controlling the revolving speed of said second cooling fan in the first mode when said determination means determines that the temperature of the intake air is less than the reference temperature; and means for controlling the revolving speed of said second cooling fan in the second mode when said determination means determines that the temperature of the intake air is greater than the reference temperature.
Claim 12
Dependent Claim
39 words
The electronic apparatus as claimed in claim 10, wherein the revolving speed of said second cooling fan controlled in the first mode and the revolving speed of said second cooling fan controlled in the second mode are constant values.
Claim 13
Dependent Claim
32 words
The electronic apparatus as claimed in claim 11, wherein the revolving speed of said second cooling fan controlled in the second mode is zero so that said second cooling fan is stopped.
Claim 14
Dependent Claim
41 words
The electronic apparatus as claimed in claim 10, wherein the revolving speed of the second cooling fan controlled in the first mode is a variable value which is increased in accordance with a decrease of the temperature of the intake air.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-15 | 1999-07-17 | 2000-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-15 | 2003-07-17 | 2004-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-15 | 2007-07-17 | 2008-01-16 | $7700.00 | Window Closed / Lapsed |