JP2006332399A - Fixing structure of cooling fan in electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure of a cooling fan that facilitates the mount of the cooling fan to an electronic apparatus even when there are limits in installation space of the cooling fan. <P>SOLUTION: A circuit board 4 is provided with a board side opening 30 and a board side bolt insertion holes 32, the cooling fan 33 is provided with fan side bolt insertion holes 35, a fixing means includes fixing bolts 44 and female thread members 42 provided to a duct 34, the cooling fan 33 and a duct 34 are arranged opposite to each other on front and rear sides of the circuit board 4 in a manner of sandwiching the board side opening 30, the fixing bolts 44 are inserted to the fan side bolt insertion holes 35 and the board side bolt insertion holes 32, and the fixing bolts 44 are respectively screwed to the female thread members 42 to fix the cooling fan 33 and the duct 34 to the circuit board 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooling fan fixing structure in an electrical apparatus such as a communication terminal apparatus that performs information communication using a telephone line or an IP line such as a telephone or a facsimile.

  In an electrical apparatus such as a communication terminal device that performs information communication using a telephone line, an IP line, etc., as shown in FIG. 72 and an L-shaped lower case 73 are housed and fixed, a display panel 75 is fixed to the front of the upper case 72, and a display LED 76 and the like are mounted on the circuit board 74. .

  In the electrical equipment described above, forced cooling means is provided to cool the circuit board 74 and the electronic components by lowering the temperature in the housing 70. This forced cooling means is usually performed by attaching a vertical-type cooling fan to the casing and driving the cooling fan. Here, the vertical installation type refers to a case where a high side of a cooling fan formed in a substantially rectangular parallelepiped is mounted upright with respect to the casing.

As a conventional cooling fan fixing structure in this type of electric apparatus, a bracket having a substantially U-shaped bracket in a top view, a locking piece having a substantially L-shape in a side view, and a top fixing plate is provided. Is fixed to the bottom plate of the housing with the open surface facing the outside of the housing, and the vertical cooling fan fitted to the bracket is locked on the open surface side of the bracket by the upright surface of the locking piece. As described above, there is one in which the vertical cooling fan is locked in the bracket by fixing the locking piece to the bottom plate of the housing and fixing the upper surface fixing plate to the upper surface side of the bracket ( Patent Document 1).
JP 2005-64046 A

  In the above-described cooling fan fixing structure in the conventional electric device, the vertical cooling fan is fixed to the bottom plate of the housing by a substantially U-shaped bracket and a locking piece. .

  Due to the downsizing of electronic devices, the housing has been reduced in size and thickness. For high-density mounting of electronic components, interface connectors (power supply and line connectors) are centrally installed on the back surface of the vertical wall of the housing, which is the mounting position of the cooling fan. For this reason, when the mounting space for the cooling fan is narrow and the cooling fan is a vertical type, there is a problem in that it becomes difficult to mount the cooling fan due to space limitations. It was happening.

  In addition, when a cooling fan is mounted on an electronic device, it may be possible to fix the cooling fan directly to the circuit board with a screw member. In this case, the cooling fan may be fixed with a uniform force. There was a problem that it was difficult.

  In addition, even when it is possible to apply a uniform force to the cooling fan, there is a problem that vibration due to the rotation of the cooling fan is transmitted to the circuit board and causes noise.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to easily mount a cooling fan on an electronic device even when the installation space of the cooling fan is limited. A cooling fan fixing structure is provided.

  In order to achieve the above object, the cooling fan fixing structure in the electrical apparatus according to the present invention cools the circuit board housed in the housing and the electronic components mounted on the circuit board in the housing. A cooling fan fixing structure in an electrical apparatus provided with a forced cooling means configured to have a cooling fan, wherein the forced cooling means is a horizontal type cooling in a direction in which a blowing direction intersects a surface portion of the circuit board And a duct for guiding cooling air discharged from the cooling fan in a direction substantially parallel to the circuit board, and the cooling fan and the duct are fixed to the circuit board. And

  With such a configuration, the cooling fan is mounted horizontally, and the cooling fan and duct are fixed to the circuit board, so that even if the cooling fan mounting space is limited, the cooling fan electronics Mounting on equipment becomes easy.

  In addition, for example, the cooling fan is provided on the rear side of the casing, and the intake port can be positioned on the front side of the casing, so that the air in the casing is agitated.

  Further, the cooling fan fixing structure in the electric device according to the present invention is the above-described cooling fan fixing structure in the electric device according to the present invention, in which the cooling fan and the duct are on the front and back of the circuit board. Each of the ducts and the cooling fan are fastened together with the circuit board interposed therebetween, and the circuit board is fixed to the circuit board.

  With this configuration, since the cooling fan and the duct are fixed to the circuit board by fastening together with fixing bolts, the horizontal cooling fan and the duct can be easily fixed to the circuit board. Even when the installation space for the cooling fan is limited, it is easy to mount the cooling fan on an electronic device.

  Further, the cooling fan fixing structure in the electric device according to the present invention is an elastic material made between the cooling fan and the circuit board in the cooling fan fixing structure in the electric device according to the present invention described above. One of the sheets is interposed.

  With this configuration, since the cooling fan is fixed between the circuit board and the cooling fan via the first sheet made of an elastic material, a uniform force can be applied to the cooling fan. In addition, the uniform fixing is further promoted more and more if it is carried out in pressure contact with one sheet over the entire end faces of the housing of the cooling fan.

  Further, by interposing one sheet between the circuit board and the cooling fan, vibration generated when the rotating part of the cooling fan rotates is absorbed by the one sheet and transmitted to the circuit board. Can be prevented.

  Further, the cooling fan fixing structure in the electric device according to the present invention is the above-described cooling fan fixing structure in the electric device according to the present invention, wherein the other of the elastic material is provided between the circuit board and the cooling fan. A sheet is interposed.

  With this configuration, since the cooling fan is fixed between the circuit board and the cooling fan via the other sheet, it is possible to apply a uniform force to the cooling fan. Further, uniform fixing is further promoted if the cooling fan is pressed against the other sheet over the entire end surface of the housing of the cooling fan.

  Further, by interposing the other sheet between the circuit board and the cooling fan, the vibration generated when the rotating part of the cooling fan rotates is absorbed by the other sheet and transmitted to the circuit board. Can be prevented.

  Further, the cooling fan fixing structure in the electric device according to the present invention is the above-described cooling fan fixing structure in the electric device according to the present invention, wherein the cooling fan is connected to the circuit via the cooling fan holding member. The cooling holding member is provided with a stopper portion having a substrate abutting portion, and the height of the stopper portion is determined by the cooling fan, the one sheet, and the other sheet. It is characterized in that it is set to be shorter than the dimension obtained by adding the thickness.

  With this configuration, the length of the stopper portion of the cooling fan holding member is shorter than the sum of the thicknesses of the cooling fan and one and the other sheets, so the other sheet is crushed. A force is applied, and the reaction force is applied to the cooling fan, so that the cooling fan can be fixed.

  According to the fixing structure of the cooling fan in the electrical apparatus according to the present invention, the horizontal mounting type of the cooling fan is used, and the cooling fan and the duct are fixed to the circuit board. Even when space is limited, it is easy to mount a cooling fan on an electronic device. In addition, for example, the cooling fan can be provided on the rear side of the casing, and the intake port can be positioned on the front side of the casing, so that the air in the casing is agitated.

  Further, according to the fixing structure of the cooling fan in the electrical apparatus according to the present invention, the cooling fan and the duct are fixed to the circuit board by being fastened together with fixing bolts. The cooling fan and the duct can be easily fixed to the circuit board, so that the cooling fan can be easily mounted on the electronic device even when the space for mounting the cooling fan is limited.

  Embodiments of a cooling fan fixing structure in an electrical apparatus according to the present invention will be described below with reference to the drawings.

(Embodiment 1)
Embodiment 1 of a cooling fan fixing structure in an electrical apparatus according to the present invention is shown in FIGS.

  FIG. 1 is a perspective view of an exploded state of an electrical apparatus provided with a cooling fan fixing structure (Embodiment 1) according to the present invention, FIG. 2 is a perspective view of an exploded state of a casing in the electrical apparatus, and FIG. FIG. 4 is a perspective view of a circuit board in the same electric device with the upper case removed. FIG. 5 is an exploded view of the cooling fan fixing structure (first embodiment) according to the present invention. It is a perspective view. In the drawings, for convenience of explanation, the vertical direction, the front-rear direction, and the left-right direction are set as illustrated.

  The electric device having the cooling fan fixing structure according to the present invention includes a synthetic resin upper case 1 as one case, a metal lower case 2 as the other case, two circuit boards 3, 4. The upper case 1 and the lower case 2 constitute a housing A.

  As shown in FIG. 2, the upper case 1 includes a case body 10 having an upper surface portion 1A, left and right side portions 1B and 1C, and a front surface portion 1D, and lacking a rear surface portion. An air intake hole (intake port) 11 is formed in the surface portion 1C, and upper printed circuit board holding portions 12 and 13 are disposed on the inner surface portions of the left and right side surface portions 1B and 1C in the front-rear direction, Side printed circuit board holders 14 and 15 are provided in the front-rear direction.

  These upper and lower printed circuit board holding portions 12, 13, 14, and 15 are configured by forming insertion groove portions 18 between a pair of upper and lower holding pieces 16 and 17. Further, lower case holding portions 19 are provided on the inner surface portions of the left and right side surface portions 1B and 1C. The lower case holding part 19 is fixed to the inner surface part of the left and right side parts 1B and 1C in the vertical direction formed in the rib 21 by the notch part 20 along the vertical direction formed in the lower printed circuit board holding part 12. A cut-out portion 21A along, a lower printed circuit board holding portion 14 as a hook hook portion, and an engaging portion 12B provided at the rear end portion of the inner surface of the upper surface portion 1A.

  As shown in FIG. 2, the lower case 2 is integrally formed with a conductor such as a sheet metal for the purpose of shielding static electricity or noise in electrical equipment, and has a bottom surface portion 2A and a rear surface portion 2B. Ribs 22A and 22B are formed on the left, right and front edge portions of the bottom surface portion 2A, and hooking hook portions 23 are formed on the front portion of the rib 22A. The bottom surface portion 2A is provided with a large number of air intake holes (inlet ports) 24 arranged in the left-right direction so as to be positioned on the front side thereof, and the rear surface portion 2B is moved to the right side with exhaust holes (exhaust ports). A plurality of 25 are formed.

  The circuit board 3 has a board body 3A, and a notch 3a is formed in the left half of the front edge of the board body 3A as shown in FIG. As shown, a plurality of connectors 26, 27, and 28 and a holder 29 having a screw hole 29a are provided on the rear edge of the substrate body 3A.

  As shown in FIG. 1, the circuit board 4 includes a board body 4A and a forced cooling mechanism K that is a forced cooling means attached to the board body 4A. As shown in FIG. 1, a notch 4a is formed in the left half thereof, and on the right side of the rear part of the substrate body 4A, as shown in FIG. A slit 31, a board side bolt insertion hole 32, and a positioning hole 31A are provided.

  As shown in FIG. 5, the forced cooling mechanism K includes a cooling fan 33 and a duct 34. The cooling fan 33 is an axial fan, and a rotating portion (not shown) is provided inside the housing 33A, and fan-side bolt insertion holes 35 are provided at four corners of the housing 33A.

  As shown in FIGS. 6 to 8, the duct 34 has a substantially rectangular top surface portion 34A, and side walls 36 and 37 are provided on both side portions of the top surface portion 34A in the left-right direction. A front end wall portion 39 is provided at the front end portion of the surface portion 34A, and the three directions of the left and right direction and the rear direction are closed, and the rear side is open. The side wall portions 36 and 37 are provided with a duct positioning rib portion 40 on the front end side thereof, and the side wall portions 36 and 37 are formed with substrate contact portions 41, which are Has a female screw member (nut) 42 fixed thereto. Further, a positioning projection 43 is provided on the edge of the front end wall 39.

  The duct 34 is positioned with respect to the board-side opening 30 by inserting the duct positioning rib portion 40 into the duct positioning slit 31 and the positioning projection 43 into the positioning hole 31A. The fixing bolts 44 are inserted into the two fan-side bolt insertion holes 35 at the opposite corners of the housing 33A of 33, and these fixing bolts 44 are passed through the board-side bolt insertion holes 32, so that the fixing bolts 44 are The cooling fan 33 is fixed to the board body 4 </ b> A of the circuit board 4 by being screwed into the female screw member 42.

  Therefore, as shown in FIG. 4, the air passage F having a closed cross section is formed by the substrate body 4 </ b> A and the duct 34. The discharge port 33B (see FIG. 5) of the cooling fan 33 communicates with the inlet side of the air passage F in the duct 34 through the substrate side opening 30, and the outlet F1 side of the air passage F is opened. ing.

  The case A is constituted by assembling the upper case 1 and the lower case 2. In this case, as shown in FIG. 2, the ribs 22 </ b> A on both sides of the bottom surface 2 </ b> A of the lower case 2 are connected to the notches 21 </ b> A of the ribs 21 of the upper case 1 and the notches 20 of the lower printed circuit board holding part 14. The hook part 23 for hooking the lower case 2 is hooked on the lower printed circuit board holding part 14 as a hook hook part. Further, the upper edge portion of the rear surface portion 2B of the lower case 2 is engaged with the engaging portion 21B of the upper case 1.

  A circuit board 3 and a circuit board 4 are accommodated in the housing A. That is, the circuit board 3 is held by the lower printed circuit board holders 14 and 15 by inserting both side edges of the board body 3A into the insertion grooves 18 of the lower printed circuit board holders 14 and 15. However, the circuit board 4 is held by the upper printed circuit board holding parts 12 and 13 by inserting both side edges of the board body 4A into the insertion groove parts 18 of the upper printed circuit board holding parts 12 and 13. .

  As described above, in a state where the circuit board 3 and the circuit board 4 are accommodated in the housing A, as shown in FIG. 3, the notch portion of the circuit board 3 is provided above the intake hole 24 provided in the lower case 2. 3a and the notch 4a of the circuit board 4 are arranged, and the outlet F1 side of the duct air passage F formed by the board body 4A and the duct 34 is close to the exhaust hole 25 provided in the lower case 2.

  The intake holes 11 formed in the right side surface portion 1C of the upper case 1 are a space K1 between the lower case 2 and the circuit board 3, a space K2 between the circuit board 3 and the circuit board 4, and the circuit board 4 and the upper case. 1 is opened in each of the spaces K3.

  For this purpose, the intake holes 11, 24, the space K1, the notch 3a, the space K2, the cooling fan 33, the duct air passage F, and the exhaust hole 25 form a forced cooling system, and the intake holes 11, the space K2, The cooling fan 33, the duct ventilation path F, and the exhaust hole 25 form a forced cooling system, and the intake hole 11, the space K2, the cooling fan 33, the duct ventilation path F, and the exhaust hole 25 form a forced cooling system.

  Therefore, by driving the cooling fan 33, the cooling air flows through each of the above-described forced cooling systems to cool the circuit board 3, the circuit board 4, and the electronic components mounted on these circuit boards 3, 4. .

  According to the first embodiment of the invention having such a configuration, the cooling fan 33 is horizontally installed, and the cooling fan 33 and the duct 34 are fixed to the circuit board 4. Even when the installation space is limited, the cooling fan 33 can be easily mounted on an electronic device. Here, the horizontal installation type refers to a case where the low side portion of the cooling fan 33 formed in a substantially rectangular parallelepiped is mounted upright with respect to the circuit board 4.

  In addition, by providing the cooling fan 33 on the rear side of the casing A and positioning the intake holes 24 on the front side of the casing A, the air in the casing A is agitated.

  Further, according to the first embodiment of the present invention, the cooling fan 33 and the duct 34 are fixed to the circuit board 4 by tightening together with fixing bolts 44. The duct 34 can be easily fixed to the circuit board 4, and even when the mounting space for the cooling fan 33 is limited, the cooling fan 33 can be easily mounted on an electronic device.

(Embodiment 2)
Embodiment 2 of the cooling fan fixing structure in the electric equipment according to the present invention is shown in FIGS.

  In the second embodiment of the cooling fan fixing structure in the electric apparatus according to the present invention, the cooling fan 47 and the duct 48 are arranged opposite to the front and back of the circuit board 4 with the board side opening 30 interposed therebetween, and the cooling fan is arranged. One sheet 57 is interposed between the holding member 50 and the cooling fan 47, and the other sheet 58 is interposed between the circuit board 4 and the cooling fan 47, and the cooling fan holding member 50 performs cooling. By holding the fan 33, the fixing bolt 61 is inserted into the member-side bolt insertion hole 56 and the board-side bolt insertion hole 32, and the fixing bolt 61 is screwed into the female screw member 42, thereby one and the other sheets 57. , 58 are compressed so that the substrate contact portions 51a, 52a of the stopper portions 51, 52 are in contact with the circuit board 4, and the cooling fan 47 and the duct 48 are fixed to the circuit board 4. Is

  On the right side of the rear portion of the board body 4A of the circuit board 4, the board side opening 30, the duct positioning slit 31, the board side bolt insertion hole 32, and the like, as in the case of the first embodiment of the present invention described above. The positioning hole 31A is provided, and the cooling fan 47 and the duct 48 have the same configuration as the cooling fan 33 and the duct 34 in the first embodiment of the present invention. A description thereof will be omitted.

  As shown in FIGS. 12 and 13, the cooling fan holding member 50 has a substantially box shape covering the cooling fan 47, and has a stopper portion 51 formed of a bent portion at the left and right edge portions of the top surface portion 50 </ b> A. , 52 are formed, bent portions 53 and 54 are formed at the front and rear edge portions of the top surface portion 50A, respectively, and substrate contact portions 51a and 52a are formed at the end portions of the stopper portions 51 and 52, respectively. It is formed. The lengths of the stopper portions 51 and 52 are set slightly shorter than the sum of the thicknesses of the one and other sheets 57 and 58 and the cooling fan 47. The top surface portion 50A is provided with a member-side opening 55 that matches a suction port (not shown) of the cooling fan 47, and a member-side bolt insertion hole 56 that is positioned on the left and right sides of the member-side opening 55. It is.

  The one and the other sheets 57 and 58 are made of an elastic material, and the sheets 57 and 58 are formed with an opening 59 corresponding to the suction port of the cooling fan 46. Bolt insertion notches 60 are formed at the left and right opposing positions.

  The duct 48 is inserted into the duct-positioning slit 31 and the positioning projection 43 (see FIG. 7) into the positioning hole 31A by inserting the duct-positioning rib portion 40 into the duct-positioning slit 31A. Positioned.

  One sheet 57 and the cooling fan 47 are accommodated in the cooling fan holding member 50 in a state of being overlaid. In this case, the opening 59 of one sheet 57 is matched with the member-side opening 55 of the cooling fan holding member 50, and the bolt insertion notch 60 of the one sheet 57 is matched with the board-side bolt insertion hole 56. It is allowed. The bolt insertion notches 60 are positioned outside the left and right side portions 47a and 47b of the cooling fan 47.

  The other sheet 58 is placed on the cooling fan 47, and the bolt insertion notch 60 of the other sheet 58 is located outside the left and right side surfaces 47 a and 47 b of the cooling fan 47. .

  The fixing bolt 61 is inserted into the pair of left and right member-side bolt insertion holes 56 of the cooling fan holding member 50, and the fixing bolt 61 is inserted into the bolt insertion notch portion 60 of one seat 57 and the bolt of the other seat 58. The fixing bolt 61 is screwed into the female screw member 42 and the one and the other sheets 57 and 58 are compressed by tightening the fixing bolt 61 so that the right and left sides of the cooling fan holding member 50 are The cooling fan 47 is fixed to the board body 4 </ b> A of the circuit board 4 by contacting the board contact parts 51 a and 52 a provided on the stopper parts 51 and 52 with the lower surface of the circuit board 4.

  The cooling system is the same as that of the first embodiment of the present invention described above. By driving the cooling fan 47, the cooling air flows through each of the forced cooling systems, and the circuit board 3 and the circuit board. 4 and the electronic components mounted on the circuit boards 3 and 4 are cooled.

  According to the second embodiment of the present invention, the cooling fan 47 is fixed between the circuit board 4 and the top surface portion 50A of the cooling fan holding member 50 via the one and the other sheets 57 and 58. In addition, since both end portions of the housing 33A of the cooling fan 47 are pressed against the one and other sheets 57, 58, it is possible to apply a uniform force to the cooling fan 47. Become.

  Further, according to the second embodiment of the present invention, one sheet 57 is provided between the cooling fan holding member 50 and the cooling fan 47, and the other sheet 58 is provided between the circuit board 4 and the cooling fan 47. By interposing it, it is possible to prevent the vibration generated when the rotating portion of the cooling fan 47 rotates from being absorbed by the one and other sheets 57 and 58 and transmitted to the circuit board 4.

  Further, according to the second embodiment of the present invention, the lengths of the left and right stopper portions 51 and 52 of the cooling fan holding member 50 are the same as those of the one sheet 57, the cooling fan 47, and the other sheet 58, respectively. Since the thickness is shorter than the added length, a force for crushing the other sheet 58 is applied, and the reaction force is applied to the cooling fan 47, so that the cooling fan 47 can be fixed.

  According to the fixing structure of the cooling fan in the electrical apparatus according to the present invention, the horizontal mounting type of the cooling fan is used, and the cooling fan and the duct are fixed to the circuit board. Even when space is limited, it is easy to mount a cooling fan on an electronic device. In addition, for example, a cooling fan can be provided on the rear side of the casing, and the intake port can be positioned on the front side of the casing, so that the air in the casing can be agitated. Since the duct is fixed to the circuit board by fastening with fixing bolts, the horizontal cooling fan and the duct can be easily fixed to the circuit board, and the cooling fan can be installed. Even when space is limited, it is easy to mount a cooling fan in electronic equipment. Therefore, electrical equipment such as a communication terminal device that performs information communication using a telephone line or an IP line such as a telephone or a facsimile is used. This is useful for fixing a cooling fan in equipment.

It is a perspective view of the decomposition | disassembly state of the electric equipment provided with the fixing structure (Embodiment 1) of the cooling fan which concerns on this invention. It is a perspective view of the decomposition | disassembly state of the housing | casing in the same electric equipment. It is a perspective view of the state which removed the upper case in the electric equipment. It is a perspective view of a circuit board in the electric equipment. It is a perspective view of the decomposition | disassembly state of the fixing structure (Embodiment 1) of the cooling fan which concerns on this invention. It is the perspective view seen from the rear surface side of the duct. It is the perspective view seen from the back side of the duct. It is the perspective view seen from the front side of the duct. It is a perspective view of the decomposition | disassembly state of the electric equipment provided with the fixing structure (Embodiment 2) of the cooling fan which concerns on this invention. It is a perspective view of a circuit board in the electric equipment. It is a perspective view of the decomposition | disassembly state of the fixing structure (Embodiment 2) of the cooling fan which concerns on this invention. It is the perspective view seen from the front side of the fan holding member for cooling. It is the perspective view seen from the back side of the fan holding member for cooling. It is a perspective view of the decomposition | disassembly state of a housing | casing.

Explanation of symbols

A Case K Forced cooling mechanism (forced cooling means)
1 Upper case (one case)
2 Lower case (the other case)
3 Circuit board 4 Circuit board 11 Air intake hole (intake port)
24 Intake holes
25 Exhaust hole (exhaust port)
30 Substrate side opening 32 Substrate side bolt insertion hole 33 Cooling fan 34 Duct 35 Fan side bolt insertion hole 42 Female screw member (nut)
44 Fixing bolt 47 Cooling fan 48 Duct 50 Cooling fan holding member 51a, 52a Substrate contact portion 57 One sheet 58 The other sheet 56 Member side bolt insertion hole 61 Fixing bolt

Claims (5)

A cooling fan fixing structure in an electrical apparatus provided with a forced cooling means comprising a circuit board housed in the housing and a cooling fan configured to cool electronic components mounted on the circuit board. There,
The forced cooling means includes a horizontally mounted cooling fan whose blowing direction intersects the surface portion of the circuit board, and a duct that guides cooling air discharged from the cooling fan in a direction substantially parallel to the circuit board. Have
A cooling fan fixing structure in an electric device, wherein the cooling fan and the duct are fixed to the circuit board. The cooling fan and the duct are arranged opposite to each other on the front and back of the circuit board, and fixed to the circuit board by fastening the duct and the cooling fan together with the circuit board interposed therebetween. The structure for fixing a cooling fan in an electrical apparatus according to claim 1. The structure for fixing a cooling fan in an electric device according to claim 1 or 2, wherein one sheet made of an elastic material is interposed between the cooling fan and the circuit board. The structure for fixing a cooling fan in an electric device according to any one of claims 1 to 3, wherein the other sheet made of an elastic material is interposed between the circuit board and the cooling fan. . The cooling fan is fixed to the circuit board via a cooling fan holding member, and the cooling holding member is provided with a stopper part having a board contact part, and the height of the stopper part 5. The fixing structure of the cooling fan in the electric device according to claim 4, wherein the cooling fan is set to be shorter than a dimension obtained by adding thicknesses of the cooling fan and the one sheet and the other sheet.

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