Heat exchange – Intermediate fluent heat exchange material receiving and... – Liquid fluent heat exchange material
Reexamination Certificate
2000-03-09
2001-06-26
Lazarus, Ira S. (Department: 3743)
Heat exchange
Intermediate fluent heat exchange material receiving and...
Liquid fluent heat exchange material
C165S080300, C361S689000, C361S700000
Reexamination Certificate
active
06250378
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the information processing apparatus and its heat spreading method, particularly relating to a mobile information processing apparatus that can readily release a heat generated to outside.
2. Background Arts
Conventionally, a technique relating to this field is disclosed in Japanese unexamined patent publication HEI 9-6481. The conventional mobile information processing apparatus mentioned in this publication as illustrated in
FIG. 47
comprises a lid
51
incorporating a heat pipe
3
and a heat spreading board
5
, and a main body
50
incorporating a heat generation unit
1
. The heat generated from the heat generation unit
1
is released from the heat spreading board
5
via a thermally conductive block
2
.
Another conventional techniques relating to this field are Japanese unexamined patent publications HEI 8-87354, HEI 8-204373 and HEI 8-261672.
FIG. 48
illustrates a side view of disintegrated lid
51
. Following components are installed in between a front panel
60
and an external chassis
12
: a liquid crystal display panel
7
; a back light
10
; a back light optical system
62
; and a inverter circuit board
95
for the back light.
FIG. 49
illustrates a temperature profile of the lid
51
and the main body
50
. Curved lines in the temperature profile illustrate isotherms. As can be seen from
FIG. 49
, a lot of heat is being generated from the CPU
1
, the back light
10
and the inverter circuit board
95
.
The conventional mobile information processing apparatus has difficulty in conducting heat, which is sent from the heat pipe
3
, throughout the heat spreading board due to an inadequate heat conduction to a direction of plane of the heat spreading board
5
. As a result of this, from within various positions of the heat spreading board
5
, only positions that are close to the heat pipe
3
were able to contribute in spreading the heat such that an effect of heat spreading in the conventional mobile information processing apparatus is therefore inadequate.
Also, the conventional mobile information processing apparatus has problems of noise and loss of energy, which are caused by a leakage current from the back light inverter circuit board
95
incorporated at an inner side of the lid
51
, flowing into the metallic chassis
12
, as shown in FIG.
21
.
SUMMARY OF THE INVENTION
The present invention aims to solve these problems by improving an efficiency of the heat spreading of the information processing apparatus. Also, the invention aims to control an influence of the leakage current that has on the information processing apparatus.
According to one aspect of the present invention, an information processing apparatus comprises a main body including a heat generation unit; a lid for covering the main body; and a thermo-siphon installed in the lid, for releasing a heat generated by the heat generation unit.
According to another aspect of the present invention, the information processing apparatus further comprises a heat spreading board attached to the thermo-siphon.
According to another aspect of the present invention, the lid of the information processing apparatus includes a chassis for covering the lid. The heat spreading board is at least a part of the chassis of the lid.
According to another aspect of the present invention, the information processing apparatus includes a heat conductor for conducting the heat generated at the heat generation unit from the heat generation unit to the thermo-siphon.
According to another aspect of the present invention, the heat conductor of the information processing apparatus includes a heat pipe which is placed in between the heat generation unit and the thermo-siphon, for transferring the heat generated at the heat generation unit to the thermo-siphon.
According to another aspect of the present invention, the thermo-siphon of the information processing apparatus includes a liquid reservoir for collecting the working fluid and a flow channel for circulating a working fluid in a. direction of a plane of the heat spreading board. The heat pipe is attached to the liquid reservoir of the thermo-siphon.
According to another aspect of the present invention, the heat conductor of the information processing apparatus includes a thermally conductive block having a hinge in between the heat generation unit and the heat pipe. The heat pipe is inserted in the hinge of the thermally conductive block.
According to another aspect of the present invention, the main body and the lid of the information processing apparatus include a connecting axis, and the thermo-siphon includes a first flow channel for circulating around a periphery of the heat spreading board, and a second flow channel for extending along to a direction perpendicular to the connecting axis of the main body and the lid, which joins with the first flow channel at both ends of the second flow channel.
According to another aspect of the present invention, the main body and the lid of the information processing apparatus include a connecting axis, and the thermo-siphon includes a third flow channel for extending along an edge of the heat spreading board in close proximity to the connecting axis of the main body and the lid, and a fourth flow channel for extending in a direction perpendicular to the connecting axis from the third flow channel.
According to another aspect of the present invention, the thermo-siphon of the information processing apparatus includes a liquid reservoir for collecting a working liquid and a flow channel for circulating a working fluid in a plane direction of the heat spreading board. One end of the heat pipe is inserted to the liquid reservoir of the thermo-siphon.
According to another aspect of the present invention, the main body and the lid of the information processing apparatus include a connecting axis, and one end of the heat pipe is extending along a direction of the connecting axis of the main body and the lid.
According to another aspect of the present invention, the information processing apparatus comprises a circulation pipe for introducing the working fluid accommodated in the thermo-siphon, and for heating the working fluid by the heat generated from the heat generating unit.
According to another aspect of the present invention, the information processing apparatus includes one end of the circulation pipe which is joined to the thermo-siphon and an other end is joined to the heat generating unit.
According to another aspect of the present invention, the circulation pipe of the information processing apparatus includes a partition wall which divides into a vapor channel for sending the working fluid vaporized by the heat from the heat generating unit to the thermo-siphon and a liquid flow back channel for returning the working fluid liquefied at the thermo-siphon.
According to another aspect of the present invention, the circulation pipe of the information processing apparatus includes an inner pipe for sending the working fluid vaporized by the heat from the heat generating unit to the thermo-siphon, and an outer pipe for returning the working fluid liquefied at the thermo-siphon.
According to another aspect of the present invention, the circulation pipe of the information processing apparatus installs a plurality of grooves at an inner wall of the circulation pipe.
According to another aspect of the present invention, the circulation pipe of the information processing apparatus installs a wick at an inner wall of the circulation pipe.
According to another aspect of the present invention, the main body and the lid of the information processing apparatus include a connecting axis, and the circulation pipe is coiled along the connecting axis of the main body and the lid.
According to another aspect of the present invention, the one end and the other end of the circulation pipe of the information processing apparatus is joined to the thermo-siphon, passing the heat generating unit in the middle for introducing the working fluid of the thermo-sip
Burns Doane , Swecker, Mathis LLP
Duong Tho
Lazarus Ira S.
Mitsubishi Denki & Kabushiki Kaisha
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