Cooling structure of electronic appliance

Details Cooling structure of electronic appliance Cooling structure of electronic appliance

2000-05-11

2001-05-01

Picard, Leo P. (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C361S679090, C361S689000, C361S816000, C361S818000, C174S034000, C211S041300, C165S121000

Reexamination Certificate

active

06226182

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a cooling structure of an electronic appliance.
BACKGROUND OF THE INVENTION
An electronic appliance accommodating printed wiring boards on which various electronic components are mounted has been hitherto cooled by an exhaust fan installed in the housing, heat pipes, or other heat exchangers. Or by forcing out the heat by natural convection, the box-shaped electronic appliance has been cooled.
However, when the fan is directly mounted on the housing, the housing radiant noise increases due to fan rotation noise and wind sound. Therefore, if the electronic appliance for general household use has such fan, noise is generated, and therefore the electronic appliance having such fan is not suited as an electronic household appliance. On the other hand, in the structure incorporating the fan inside of the housing, molded parts must be newly added for exhausting the heat outside of the housing or taking in air. As a result, the manufacturing cost is higher. The electronic appliance having heat pipes or other heat exchangers, expensive heat countermeasure parts are needed. Therefore, because of high product cost, electronic appliances having such heat exchangers are not suited as electronic household appliances.
SUMMARY OF THE INVENTION
A cooling structure of an electronic appliance having heat generating parts of the invention comprises a housing having a top panel, side panels, and a bottom panel, a case disposed in the housing, a circuit board disposed in the case, and a frame disposed in the space between the top panel and case, in which the circuit board has heat generating parts, the space enclosed by the top panel, case and frame forms a wind tunnel, the space enclosed by the circuit board and the case forms an inner space, and the heat generated in the heat generating parts is exhausted outside of the housing by the air passing through the wind tunnel.
Preferably, the cooling structure further comprises a fan disposed in the case. The case and the circuit board have the circuit board disposed in the housing, and a shield case disposed to cover the circuit board. The frame has an elastic member. At least one of the top panel and the bottom panel has a cooling hole. The case has a first ventilation hole. The circuit board has a second ventilation hole.
In this configuration, the heat generated from the circuit board is easily exhausted outside of the housing. Accordingly, accumulation of heat in the electronic appliance is prevented. As a result, the electronic appliance is cooled efficiently. Since the wind tunnel functions as duct, other molded part as duct is not needed. Therefore, the cost is reduced. Since the ran rotates inside of the housing, leak of rotation noise generated by fan rotation to outside of the housing is prevented. As a result, the noise level is lowered.


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