Electronic apparatus having a heat dissipation member

[0002] This application is a divisional application of U.S. Ser. No. 08/848,728 filed May 22, 1997 now U.S. Pat. No. 6,226,180, now allowed.

[0003] 1. Field of the Invention

[0004] The invention relates to a heat dissipation structure for a notebook type computer, more specifically to a heat dissipation structure for a notebook type computer for radiating heat from a body portion beneath a hinge shaft of an openable/closable cover for a main body.

[0005] 2. Description of the Related Art

[0006] Recently, personal computers have gradually been miniaturized to a portable notebook size as shown in FIGS. 20A and 20B. This is constituted by a main body 1 having a housing 4 with a keyboard thereon (not shown) and accommodating therefor a CPU 2, a HDD 3, a PC card 4 and so on therein, a display device 6, and a hinge for coupling the display device 6 to the main body 1 so that the display device 6 forms an openable/closable cover for the housing 5. The keyboard has a plurality of keys having keytops arranged in a matrix manner with a small gap between adjacent keys. Information input from the keyboard is processed by CPU 2 in the main body and displayed on the display device 6.

[0007] The notebook type computer described above generates heat from high temperature elements built into the main body (for example, a CPU), which heat must be dissipated therefrom. In the prior art, a heat dissipation plate 7 made of aluminum or copper is attached to the high temperature element to radiate the heat in the interior of the computer. According to the prior art heat dissipation structure described above, it is possible to equalize the temperature in the interior of the computer, but the temperature may rise as a whole to exceed an allowable limit of other elements having a lower resistance to heat (such as an HDD, a PC card, an FDD, a CD-ROM or the like).

[0008] The present invention has been made to solve the above problem inherent in the prior art by providing a heat dissipation structure for a notebook type computer capable of effectively carrying out the heat dissipation from a high temperature element (such as a CPU).

[0009] Accordingly, an object of the present invention is to provide a heat dissipation structure for a notebook type computer which is capable of effectively dissipating heat from a high temperature element (such as a CPU).

[0010] To achieve the above object, the present invention provides a heat dissipation structure, for a notebook type computer, comprising: a main body including electrical elements in a housing; a display device; a hinge shaft for coupling the main body with the display device, said hinge shaft being arranged above the main body at a distance therefrom; and a heat dissipation device provided in the main body adjacent to the hinge shaft.

[0011] According to one aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate of a T or L-shape is provided in the main body. According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate is provided in the main body, and an opening is provided in a housing wall at a position above a heat dissipation section of the heat dissipation plate. Also, the opening may be provided in the housing wall at a position beneath at least one end of the heat dissipation section of the heat dissipation plate.

[0012] According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate having a plurality of fins in a heat dissipation section thereof is provided in the main body. According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate having a heat pipe in a heat dissipation section thereof is provided in the main body.

[0013] According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate of a T or L-shape is provided in the main body, and an opening is provided in a central zone of a heat dissipation section of the heat dissipation plate. According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate comprising a heat dissipation section having a channel-shaped cross-section is provided in the main body.

[0014] According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a duct-shaped tubular heat dissipation section is provided in the main body, wherein an inclined lower opening of the duct is used as an intake port for sucking air and an inclined upper opening of thereof is used as an exhaust port. An exhaust fan may be provided in the tubular heat dissipation section. Also, the duct-shaped tubular heat dissipation section may be cylindrical. A louver may be provided midway of the tubular heat dissipation section, for sucking part of the air in the housing and exhausting the same therefrom. A baffle may be provided for partitioning the interior of the tubular heat dissipation section into an outer air flow-in chamber and an inner air flow-in chamber. The tubular heat dissipation section may be of a T-shaped profile.

[0015] According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate partly formed of a metal piece is provided in the main body, and one end of the metal piece is connected to a second heat dissipation plate provided in a lower part of a display-mounting portion or a rear surface thereof. An outer surface of the metal piece may be covered with a resin. According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate is provided in the main body, and an opening is provided in a housing wall at a position above a heat dissipation section of the heat dissipation plate, and a duct is provided in a display-mounting part and connected to the opening via a flexible pipe. An exhaust fan may be provided in the duct. According to another aspect of the present invention, a heat dissipation structure for a notebook type computer is provided, comprising a main body, a display device and a hinge shaft for coupling the main body with the display device; said hinge shaft being arranged above the main body at a distance therefrom, a heat dissipation plate is provided in the main body, in which is formed a cavity wherein an operating liquid for transporting heat is sealed.

[0016] These and other objects of the present invention will become apparent from the following detailed description of the preferred embodiment of the invention, taken in connection with the accompanying drawings.

[0017] In the drawings:

[0018] FIG. 1A is a cross-sectional view, and FIG. 1B is a see-through view of a first embodiment of a heat dissipation structure for a notebook type computer according to the invention;

[0019] FIG. 2A is a perspective view of a first example, and FIG. 2B is a perspective view of a second example, of a heat radiation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0020] FIG. 3 is a cross-sectional view of a second embodiment of a heat dissipation structure for a notebook type computer according to the present invention;

[0021] FIG. 4A is a cross-sectional view, FIG. 4B is a perspective view, and FIG. 4C is a cross-sectional view, of a third embodiment of a heat dissipation structure for a notebook type computer according to the present invention;

[0022] FIG. 5A is a perspective view, and FIG. 5B is a cross-sectional view, of a third example of a heat radiation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0023] FIG. 6 is a perspective view of a fourth example of a heat radiation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0024] FIG. 7 is a perspective view of a fifth example of a heat radiation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0025] FIG. 8 is a cross-sectional perspective view of a sixth example of a heat radiation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0026] FIG. 9 is a cross-sectional view of a fourth embodiment of a heat dissipation structure for a notebook type computer according to the present invention;

[0027] FIG. 10 is a view of a seventh example of a heat radiation plate used in the fourth embodiment of a heat dissipation structure for a notebook type computer according to the present invention;

[0028] FIG. 11 is a view of a pipe used as the seventh example of the heat dissipation plate in the heat dissipation structure for a notebook type computer according to the present invention;

[0029] FIG. 12 is a view of an eighth example of a heat dissipation plate used in the heat dissipation structure for a notebook type computer according to the present invention described with reference to FIG. 10;

[0030] FIG. 13 is a view of a ninth example of a heat dissipation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0031] FIG. 14 is a view of a tenth example of a heat dissipation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0032] FIG. 15 is a view of an eleventh example of a heat dissipation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0033] FIG. 16 is a view of a twelfth example of a heat dissipation plate used in a heat dissipation structure for a notebook type computer according to the present invention;

[0034] FIG. 17A is a cross-sectional partial view, and FIG. 17B is a perspective view, of a fifth embodiment of a heat dissipation structure for a notebook type computer according to the present invention;

[0035] FIG. 18 is a cross-sectional view of a main part of a sixth embodiment of a heat dissipation structure for a notebook type computer according to the present invention;

[0036] FIG. 19A is a perspective view, and FIG. 19B is a cross-sectional view, of a thirteenth example of a heat dissipation plate used in a heat dissipation structure for a notebook type computer according to the present invention; and

[0037] FIG. 20A is a perspective view, and FIG. 20B is a cross-sectional view, of a prior art notebook type computer.

[0038] FIGS. 1A and 1B illustrate a heat dissipation structure for a notebook type computer according to a first embodiment of the present invention; wherein FIG. 1A is a cross-sectional view and FIG. 1B is a see-through view of a main body. In the drawings, reference numeral 10 denotes a main body of the notebook type computer; 11 a housing of the main body; and 12 a display device. A keyboard or other input device 10a′ (shown in phantom lines) is attached to the upper surface 10′ of the main body 10, and a HDD (hard disk drive) 13, a PC card 14, a CPU 16 mounted onto a circuit board 15 and so on are accommodated in the housing 11. A heat dissipation plate 17 made of a heat conductive metal such as aluminum or copper and having a heat receiving end, or portion, 17aand a heat dissipation end, or portion, 17b,is attached as a heat dissipation means to the upper surface of CPU 16, and the end 17bof the heat dissipation plate 17 is located in a side zone 11-2 in the interior of and along a perimeter side wall 11-3 of the housing 11 (and thus below a hinge shaft which supports and pivotally couples the display device 12 to the housing 11). More particularly, the display device 12 is connected by hinge shaft HS to a bracket 11aaffixed to the housing 11 and extending upwardly from the upper main surface 11-1.

[0039] The first embodiment of the heat dissipation structure for the notebook type computer thus structured conducts heat generated in high temperature elements such as CPU 16 via the heat dissipation plate 17 to the side zone 11-2 in the interior of the housing 11 and radiates the heat through the side wall 11-3 of the housing 11 to the exterior thereof. Accordingly, it is possible to radiate heat outside the housing 11 without increasing the temperature of other elements having a lower resistance to heat and mounted in a central area of the housing 11.

[0040] FIGS. 2A and 2B illustrate first and second examples of a heat dissipation plate 17 used in the first embodiment of the heat dissipation structure for a notebook type computer shown in FIGS. 1A and 1B, wherein the heat dissipation plate shown in FIG. 2A is of a T-shape, and that shown in FIG. 2B is of an L shape. In both the drawings, a heat reception section 17ais a hatched portion, which is to be in contact with a high temperature element such as a CPU or similar device, and a heat dissipation section 17bis an elongate portion, which is to be located in the vicinity of the side zone 11-2 at the inside of the wall 11-3 of the housing 11 for the purpose of heat dissipation, whereby a narrow space in the side zone 11-2 can be effectively used to increase the heat dissipation efficiency.

[0041] FIG. 3 is a cross-sectional view of a second embodiment of a heat dissipation structure for a notebook type computer according to the present invention. Similar to the preceding embodiment, reference numeral 10 denotes a main body; 11 a housing; and 12 a display device, and a HDD 13, a circuit board 15, a CPU 16, a heat dissipation plate 17 and so on are accommodated in the interior of the housing 11. A characteristic structure of this embodiment is that an opening 18 for air ventilation is provided at a position above the heat dissipation section 17bof the heat dissipation plate 17 extending to the side zone of the housing 11. This opening 18 may be either one or more, or a plurality of slits may be provided for this purpose.

[0042] According to the second embodiment of the heat dissipation structure for a notebook type computer, heat generated by a high temperature element such as CPU 16 is conducted to a side zone of the interior of the housing 11 by the heat dissipation plate 17 and then to the air via the heat dissipation section 17b.The air thus heated is exhausted from the opening 18 to the outside of the housing. Since the heat generated within the housing 11 and dwelling in the upper zone thereof is discharged from the housing in such a manner, the interior temperature of the housing is further lowered compared with the preceding embodiment.

[0043] FIGS. 4A, 4B, and 4C illustrate a third embodiment of a heat dissipation structure for a notebook type computer according to the present invention, wherein FIG. 4A is a cross-sectional view thereof, FIG. 4B is a perspective view of a main body and FIG. 4C is a cross-sectional view of the main body. This embodiment has a similar structure to those of the preceding embodiments, except that a ventilation opening 19 is provided in the bottom wall of a housing 11 at a position below a heat dissipation section 17bof a heat dissipation plate 17. Preferably, either one slit or more are formed as the opening 19 at a position beneath at least one end of the heat dissipation section 17bof the heat dissipation plate 17.

[0044] According to the third embodiment of the heat dissipation structure for a notebook type computer, fresh air is introduced in the arrowed direction from the opening 19 formed in the bottom wall 11-4 of the housing 11 in the vicinity of the heat dissipation section 17bof the heat dissipation plate 17, as shown in FIGS. 4B and 4C, and exhausted from an upper opening 18 in the upper main surface 11-1 after cooling the heat dissipation section 17b,whereby the cooling efficiency is further enhanced compared with the preceding embodiments.

[0045] FIGS. 5A and 5B illustrate a third example of a heat dissipation plate used in a heat dissipation structure for a notebook type computer according to the present invention, wherein FIG. 5A is a perspective view of the heat dissipation plate, and FIG. 5B is a cross-sectional view thereof when used in main body. A characteristic of this heat dissipation plate resides in a heat dissipation section 17b.The heat dissipation section 17bof the heat dissipation plate 17 comprises a plurality of fins 17carranged parallel to each other in the lengthwise direction while being fixed together by a pair of connecting members 17d,17e.The connecting member 17dconnected to a heat reception section 17ahas a larger height than the other connecting member 17eso that a height difference L is created when the fins are fixed together, as shown in FIG. 5B.

[0046] According to the third example of the heat dissipation plate used in the heat dissipation structure for a notebook type computer according to the present invention, since a larger heat dissipation area is obtainable by a large number of fins 17c,it is possible to further improve the heat dissipation efficiency compared with the first example.

[0047] FIG. 6 illustrates a perspective view of a fourth example of a heat dissipation plate 17 used in a heat a dissipation structure for a notebook type computer according to the present invention. This heat dissipation plate 17 is formed of a heat reception section 17aand a heat dissipation section 17bextending leftward and rightward from the heat reception section 17ato form a T-shape, and a heat pipe 20 is attached to the heat dissipation section 17bin the lengthwise direction.

[0048] According to the fourth example of the heat dissipation plate used in the heat dissipation structure for a notebook type computer according to the present invention, the heat reception section 17ais brought into contact with a high temperature element during use so that heat generated by the high temperature element is conducted to a central zone of the heat dissipation section 17b.Then, an operating fluid in the heat pipe 20 is evaporated to a vapor which flows in the heat pipe toward the opposite end portion of the heat dissipation section having a lower temperature and loses the heat to transform to a liquid which returns to a central zone of the heat pipe via a wick. The operating fluid transports heat from a central zone to opposite end portions of the heat dissipation section in such a manner. Thus, it is possible to effectively cool a high temperature element such as a CPU.

[0049] FIG. 7 illustrates a perspective view of a fifth example of a heat dissipation plate used in a heat dissipation structure for a notebook type computer according to the present invention. This heat dissipation plate 17 is formed of a heat reception section 17aand a heat dissipation section 17bextending leftward and rightward from the heat reception section 17ato form a T-shape, and an opening 17fis provided in a central zone of the heat dissipation plate 17bwhere a heat pool is liable to be formed. In this connection, although the opening is formed in the T-shaped heat dissipation plate in this drawing, it may be provided in a similar manner to an L-shaped heat dissipation plate.

[0050] The heat dissipation plate of the fifth example used in the heat dissipation structure for a notebook type computer according to the present invention is used while causing the heat reception section 17ato be in contact with a high temperature element. Heat generated in the high temperature element is radiated into air while being conducted by the heat dissipation section 17b,during which some of the air flowing along the heat dissipation section 17bpasses through the opening 17fto facilitate the air flow and improve the cooling efficiency.

[0051] FIG. 8 illustrates a cross-sectional perspective view of a sixth example of a heat dissipation plate used in a heat dissipation structure for a notebook type computer according to the present invention. A heat dissipation plate 17 is formed of a heat reception section 17aand an elongated heat dissipation section 17bextending leftward and rightward from the heat reception section 17a,wherein the heat dissipation section 17bhas a channel-like cross-section, as shown in the drawing. In the heat dissipation plate of the sixth example used in the heat dissipation structure for a notebook type computer according to the present invention, the surface area of the heat dissipation section 17bis made larger to enhance the cooling efficiency.

[0052] FIG. 9 illustrates a cross-sectional view of a fourth embodiment of a heat dissipation structure for a notebook type computer according to the present invention. A housing 11 and a heat dissipation plate 17 are solely shown in the drawing, and other parts are omitted. According to this embodiment, the heat dissipation plate 17 includes a heat reception section 17ato be mounted onto a high temperature element and an inclined pipe 21 attached to the heat reception section 17a.An intake opening 22 for air is provided in one side wall of the housing 11 at a lower position, while an exhaust opening 23 is provided in the other side wall at a higher position, so that opposite ends of the pipe 21 of the heat dissipation plate 17 are aligned therewith to form a duct structure.

[0053] According to the fourth embodiment of the heat dissipation structure for a notebook type computer according to the present invention, the heat reception section 17ais attached to the high temperature element so that heat generated in the high temperature section is conducted to the pipe 21 via the heat reception section 17a.When the temperature of the pipe becomes higher, air in the pipe 21 is heated and moves upwardly in the inclined pipe and is discharged outside the housing from the exhaust opening 23, while fresh air is introduced into the intake opening 22 to effectively cool the high temperature element via the heat reception section 17a.

[0054] FIG. 10 illustrates a seventh example of a heat dissipation plate used in the fourth embodiment of the heat dissipation structure for a notebook type computer according to the present invention. A difference between this heat dissipation plate 17 and that described with reference to FIG. 9 is that the pipe 21 is provided with a fan 24, while the remaining structure is the same as the latter.

[0055] According to the seventh example of the heat dissipation plate used in the fourth embodiment of the heat dissipation structure for a notebook type computer according to the present invention, since air heated in the pipe 21 is forcibly exhausted by the fan 24, the cooling efficiency is further enhanced compared with the preceding example shown in FIG. 9.

[0056] FIG. 11 illustrates an instance of the pipe 21 in the seventh example of the heat dissipation plate in the fourth embodiment of the heat dissipation structure used for a notebook type computer according to the present invention defined by claim 11, wherein the pipe 21 is cylindrical. This pipe has the same effect as that described with reference to FIG. 10.

[0057] FIG. 12 illustrates an eighth example of a heat dissipation plate used in the fourth embodiment of the heat dissipation structure for a notebook type computer according to the present invention. A difference between this example and that described with reference to FIG. 10 resides in that a louver 25 is provided midway in the pipe 21, while the remaining structure is the same as the latter.

[0058] According to this example, it is possible to cool the high temperature element via the heat reception section 17aand move part of air in the housing from the louver 25 into the pipe to discharge the same out of the housing.

[0059] FIG. 13 illustrates a ninth example of a heat dissipation plate used in the fourth embodiment of the heat dissipation structure for a notebook type computer according to the present invention. A difference between this example and the eighth example of the heat dissipation plate described with reference to FIG. 12 is that a baffle 26 is provided in the pipe 21 for partitioning the interior thereof into an outer air flow-in chamber and an inner air flow-in chamber, while the remaining structure is the same as the latter. According to this example, since the interior of the pipe is partitioned into the outer air flow-in chamber and the inner air flow-in chamber, the high temperature element can be more reliably cooled with the outer air, and part of air in the housing can be discharged.

[0060] FIG. 14 illustrates a tenth example of a heat dissipation plate used in the fourth embodiment of the heat dissipation structure for a notebook type computer according to the present invention. This heat dissipation plate is formed of a heat reception section 17aand a T-shaped pipe 21. According to this heat dissipation plate, it is possible to further effectively conduct heat from the heat dissipation section to the pipe due to an increase in the heat conductive area of the T-shaped pipe as well as to discharge air in the housing to the outside thereof.

[0061] FIG. 15 illustrates an eleventh example of a heat dissipation plate used in the first embodiment of the heat dissipation structure shown in FIGS. 1A and 1B for a notebook type computer according to the present invention. In this example, a metal piece 27 is provided on a heat dissipation section 17bof a T or L-shaped heat dissipation plate 17, and connected at one end thereof to a second heat dissipation plate provided in the lower portion or the rear surface of the display device 12, such as an LCD, and shown respectively at 27′ and 27″. If a flexible sheet is used as the metal piece 27, the opening/closing of the display device is not disturbed. Since the heat dissipation section extends outside the main body, it is possible to carry out effective heat dissipation.

[0062] According to this heat dissipation plate, heat generated in a high temperature element is radiated not only from the heat dissipation section 17abut also from the display device or the second heat dissipation plate through the metal piece 27, whereby the cooling efficiency is enhanced.

[0063] FIG. 16 illustrates a twelfth example of a heat dissipation plate used in the first embodiment of the heat dissipation structure shown in FIGS. 1A and 1B for, a notebook type computer according to the present invention. In this example, a metal piece 27 is provided on a heat dissipation section 17bof a T or L-shaped heat dissipation plate 17 and is coated with a resin 28 except for a part to be bonded to the display device 12 or the second heat dissipation plate.

[0064] The heat dissipation plate according to this example has the same effect as that of the eleventh example, and particularly prevents the heat from radiating around the metal piece 27 because the metal piece is coated with the resin.

[0065] FIGS. 17A and 17B illustrate a heat dissipation structure for a notebook type computer according to a fifth embodiment of the present invention; FIG. 17A is a cross-sectional view of a main part and FIG. 17B is a perspective view. In the heat dissipation structure of this embodiment, a ventilation opening 29 is provided in the upper wall of a housing 11 at a position opposite to part of a heat dissipation section 17bof a heat dissipation plate 17, and a duct 30 is provided on a cover carrying a display device 12 thereon. A lower end of the duct 30 and the opening 29 in the housing 11 are connected with each other by a flexible pipe 31 made, for example, of rubber or resin.

[0066] According to the fifth embodiment of the heat dissipation structure for a notebook type computer thus structured, heated air is introduced from the heat dissipation section 17bof the heat dissipation plate 17 into the duct 30, and discharged outside due to the chimney effect of the duct 30. Therefore, the convection is accelerated in the vicinity of the heat dissipation section 17bto enhance the cooling efficiency.

[0067] FIG. 18 illustrates a heat dissipation structure for a notebook type computer according to a sixth embodiment of the present invention. This embodiment is substantially the same as the fifth embodiment of the heat dissipation structure for a notebook computer already described with reference to FIGS. 17A and 17B, except that a fan 32 is provided in the duct 30 in this embodiment. According to this embodiment, it is possible to forcibly exhaust air in the duct 30 and improve the heat dissipation effect due to the heat diffusion caused by the fan 31. In addition, even if there is insufficient space for installing a fan in the display device 12, it is possible to mount the fan on the exterior thereof, as shown.

[0068] FIGS. 19A and 19B illustrate a thirteenth example of a heat dissipation plate used in the heat dissipation structure for a notebook type computer according to the present invention; FIG. 19A is a perspective view and FIG. 19B is a cross-sectional view thereof. A T or L-shaped heat dissipation plate 17 (in the drawing, a T-shaped plate is illustrated) has a cavity 33 having an inclined bottom wall, in which is sealed an operating fluid 34 for heat transportation (i.e., a heat exchange fluid).

[0069] According to this heat dissipation plate, heat in the heat reception section 17acauses the operating fluid 34 to evaporate. The vapor reaches the heat dissipation section 17bto radiate the heat and the cooled vapor is transformed back into a liquid phase. Thereafter, the operation fluid in the liquid phase returns to the heat reception section 17a.The above steps are repeated to effectively conduct heat from the heat reception section 17ato the heat dissipation section 17b.

[0070] According to the heat dissipation structure for a notebook type computer of the present invention, heat generated in a high temperature element such as a CPU is transported to a side zone of the computer housing so that the heat is dissipated in this limited space, whereby the heat dissipation is carried out without adversely affecting other elements having a lower resistance to heat mounted in a central zone of the computer.

[0071] It is to be understood that the invention is by no means limited to the specific embodiments illustrated and described herein, and that various modifications thereof may be made which come within the scope of the present invention as defined in the appended claims.