JP2006093429A - Electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively cool a heat generator in electronic equipment wherein a printed substrate with the heat generator is provided to the inside of a housing 5. <P>SOLUTION: An exhaust fan 7 sucks air from an inlet 8 into the housing 5 and cools electronic elements A, B on the printed substrate 4 inside the housing. A front panel 3 connected to the printed substrate 4 is also provided with an inlet 9, and the inlet guides air to the area between the heat generators A, B on the substrate via a duct 10 on the substrate 4. If air is not supplied from the duct 10, the electronic element B in a downstream of an air flow suffers from heat generation of the electronic element A. However, cooling effect of the electronic element B is improved by air from the duct 10, and both the electronic elements A, B are cooled with equivalent efficiency. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic device configured such that a plug-in unit including a printed board on which a heating element such as an electronic element is mounted can be freely inserted into and removed from a casing, and more particularly, the heating element on the printed board. The present invention relates to an electronic device having excellent cooling efficiency.

In an electronic apparatus in which a printed circuit board on which a heating element such as an electronic element is mounted is provided in a casing, there is a case where a structure as described in Patent Document 1 below is provided for cooling the heating element. . In other words, an exhaust fan is provided in a part of the casing to cool the heating element, and an intake port is provided in another part of the casing away from the exhaust fan. Is sucked into the casing from the air inlet, and the air is circulated along the surface of the printed circuit board in the casing to cool the heating element, and then discharged to the outside by the exhaust fan. In particular, in Patent Document 1, an air guide plate is provided on a printed circuit board, so that air circulating in the housing is blown to a specific heating element at a predetermined position on the printed circuit board so that cooling is performed efficiently. It has become.
JP-A-6-120386

  In the invention described in Patent Document 1, the air flow direction in the housing by the exhaust fan and the air intake port is fixed, and the manner of mounting the printed circuit board to the housing is also fixed. In the housing, the cooling air always flows in a certain direction with respect to the heating element on the printed circuit board. Therefore, the air guide plate provided on the printed circuit board is optimally arranged and shaped in a predetermined direction in which air flows in the housing in order to efficiently guide a large amount of air to the heating element.

  However, some electronic devices proposed by the applicant of the present application are assumed to be used in common by exchanging a printed circuit board on which an electronic element as a heating element is mounted between a plurality of cases. For example, in the network measuring instrument proposed by the applicant of the present application, as shown in FIGS. 8 and 9, a printed circuit board 101 on which electronic elements A and B as heating elements are mounted is one measuring unit (plug-in unit 102). The plug-in unit 102 is used by being inserted into a case 200 of a handy-type measuring instrument in which a relatively small number of plug-in units 102 are set as shown in FIG. At the same time, it can be used by being inserted into a housing 300 of a large measuring instrument in which a relatively large number of plug-in units 102 are installed in the installation type as shown in FIG.

  Here, in both the handy type and the installation type measuring instruments, the casings 200 and 300 are provided with the exhaust fan 105 and the air ports 106 and 106 ′ as described in Patent Document 1, The flow direction of the air in the bodies 200 and 300 is constant. Specifically, in both cases, air is sucked from the suction ports 106, 106 ′ on the bottom side or the front side of the casings 200, 300, and the air is exhausted by the exhaust fan 105 on the back side of the casings 200, 300. Discharge outside 200,300.

  The handy-type measuring instrument shown in FIG. 8 is used by connecting to Ethernet (registered trademark) or the like as necessary. Since the number of installed plug-in units 102 is relatively small, the plug-in unit 102 The printed circuit board 101 is inserted through the opening on the side surface of the housing 200 in such a manner that the printed circuit board 101 is horizontal, and is installed in the housing 200 in a vertically overlapping direction.

  Further, the installation type measuring instrument shown in FIG. 9 is for always connecting to a network for monitoring. Since the number of installed plug-in units 102 is relatively large, the plug-in unit 102 has a vertical printed circuit board 101. In such a manner, it is inserted through the opening on the front surface of the housing 300 and is installed in the housing 300 in a direction to be arranged side by side.

  As described above, in the handy type measuring device and the installation type measuring device, the insertion direction / mode of the plug-in unit 102 (or the printed circuit board 101) with respect to the housings 200, 300 is different. Even if the exhaust structure is substantially the same, the direction of the air flow with respect to the plug-in unit 102 inserted in the housings 200 and 300 may not be the same.

  That is, in the example of FIG. 8 and FIG. 9, two electronic elements A and B serving as heating elements are mounted side by side on the printed circuit board 101 of the plug-in unit 102, but in the case of the handy type shown in FIG. Then, as shown by the arrows in the figure, the air sucked from the air inlet 106 flows in the order of the electronic elements A and B along the printed circuit board 101, so that the downstream electronic element B receives the heat generated by the electronic element A. Thus, it is exposed to more severe conditions than the electronic element A.

  On the other hand, in the case of the installation type shown in FIG. 9, although it is the same plug-in unit 102, the air sucked from the air inlet 106 ′ along the printed circuit board 101 as shown by the arrow in the figure is the electronic element B, Since the electronic element A flows in the order of A, the downstream electronic element A is subjected to the heat generated by the electronic element B and is exposed to more severe thermal conditions than the electronic element B.

  As described above, when the same plug-in unit 102 is shared between a plurality of types of casings 200 and 300, the air flow direction in each casing 200 and 300 may not be shared. However, there is a problem that the cooling state of the heating element provided in the plug-in unit 102 cannot be made constant and a constant heat radiation effect cannot be obtained. Also in the case of the printed circuit board provided with the air guide plate described in Patent Document 1 described above, the structure of the air guide plate is constant. It is the same that the cooling state is not constant and a predetermined heat dissipation effect cannot be obtained.

  The present invention solves the above-described problems, and in an electronic device in which a plug-in unit including a printed board on which a heating element such as an electronic element is mounted is inserted into a housing, the heating element is cooled. The first purpose is to be able to perform efficiently, and even when a plug-in unit is inserted into another casing in which the air circulation state in the casing is reversed, a plurality of lines arranged in the air circulation direction Another purpose is to make the cooling state of the heating element equal.

An electronic apparatus 1, 1 ′ described in claim 1 includes a front panel 3, a printed circuit board 4 connected to the front panel 3, and a heating element (electronic element A or B) fixed to the printed circuit board 4. Including plug-in unit 2;
Housings 5 and 5 having openings 6 and 6 'for inserting the plug-in unit 2 and having an exhaust fan 7 on one wall surface and first intake ports 8 and 8' on the other wall surface. In the electronic device 1, 1 with “
A second air inlet 9 provided in the front panel 3;
Ducts 10, 10a, 10b, 10c, 10d that are provided on the printed circuit board 4 and guide the outside air introduced from the second air inlet 9 to the heating element (electronic element A or B) or the vicinity thereof. It is characterized by having.

  The electronic device 1, 1 ′ described in claim 2 is characterized in that, in the electronic device 1, 1 ′ described in claim 1, the ducts 10, 10 a, 10 b, 10 c, 10 d are cylindrical.

  The electronic device 1, 1 ′ according to claim 3 is the electronic device 1, 1 ′ according to claim 2, wherein a part of a wall surface constituting the duct 10, 10a, 10b, 10c, 10d is the printed circuit board. 4 is a feature.

  The electronic device 1, 1 ′ described in claim 4 is the electronic device 1, 1 ′ according to claim 3, wherein the opposite side of the duct 10, 10 a, 10 b, 10 c, 10 d to the printed circuit board 4 is opened. The duct member 10, 10a, 10b, 10c, 10d is formed into a cylindrical shape by mounting the plate member 11 on the surface of the printed circuit board 4 on which the ducts 10, 10a, 10b, 10c, 10d are provided. It is characterized by having.

  The electronic device 1, 1 ′ described in claim 5 is the electronic device 1, 1 ′ according to claim 1, wherein the ducts 10, 10 a, 10 b, 10 c, 10 d are heat sinks 12 a, 12 b, 12 c and heat. It is characterized by being connected.

The electronic device 1, 1 ′ described in claim 6 includes a front panel 3, a printed circuit board 4 connected to the front panel 3, and a plurality of electronic devices provided on the printed circuit board 4 along a predetermined parallel direction. A plug-in unit 2 including a heating element (electronic elements A and B),
It has openings 6 and 6 ′ for inserting the plug-in unit 2 in a replaceable manner, has an exhaust fan 7 on one wall surface, and first intake ports 8 and 8 ′ on the other wall surface, A housing 5, 5 ′ configured to allow air to flow in a constant direction along the parallel arrangement direction of the heating elements (electronic elements A, B) of the inserted plug-in unit 2;
Parallel arrangement of heating elements (electronic elements A and B) of the plug-in unit 2 inserted into the casings 5 and 5 ′ by selecting the casings 5 and 5 ′ into which the plug-in unit 2 is inserted In the electronic device 1, 1 ′ configured so that the direction of air flow in the casing 5, 5 ′ is opposite to the direction,
A second air inlet 9 provided in the front panel 3;
A duct 10 provided on the printed circuit board 4 for guiding outside air introduced from the second air inlet 9 in the vicinity of an intermediate position between the plurality of heating elements (electronic elements A and B) arranged in parallel. , 10a, 10b, 10c, and 10d.

  According to the electronic apparatus 1, 1 ′ described in claim 1, when the plug-in unit 2 is inserted into the casings 5, 5 ′, the first of the casings 5, 5 ′ is generated by the suction force of the exhaust fan 7. The air sucked from one intake port 8, 8 ′ flows through the inside of the casings 5, 5 ′ and is discharged out of the casings 5, 5 ′ by the exhaust fan 7. Since air is also sucked in from the second air inlet 9 provided on the front panel 3, and is guided by the ducts 10, 10a, 10b, 10c, 10d, and supplied to the vicinity of the heating element (electronic element A or B). The cooling of the heating element (electronic element A or B) is performed efficiently.

  According to the electronic device 1, 1 ′ described in claim 2, in addition to the effect of the electronic device 1, 1 ′ described in claim 1, the ducts 10, 10 a, 10 b, 10 c, 10 d are second because they are cylindrical. The entire amount of air sucked from the air inlet 9 can be reliably supplied to the heating element (electronic element A or B) for cooling.

  According to the electronic device 1, 1 ′ described in claim 3, in addition to the effect of the electronic device 1, 1 ′ described in claim 2, one of the wall surfaces constituting the ducts 10, 10 a, 10 b, 10 c, 10 d. Since the printed circuit board 4 also serves as a part, it is not necessary to prepare a cylindrical dedicated part as the ducts 10, 10a, 10b, 10c, and 10d.

  According to the electronic device 1, 1 ′ described in claim 4, in addition to the effect of the electronic device 1, 1 ′ described in claim 3, the space between the first and second printed circuit boards 4, 11 facing each other is blocked. The tubular duct 10 can be configured by the members.

  According to the electronic device 1, 1 ′ described in claim 5, in addition to the effects in the electronic device 1, 1 ′ described in claim 1 to 4, the ducts 10, 10 a, 10 b, 10 c, 10 d are connected to the heat sink 12 a, The cooling effect can be further enhanced by thermally connecting to 12b and 12c.

  According to the electronic device 1, 1 ′ described in claim 6, with respect to the casings 5, 5 ′ in which the flow direction of the air by the exhaust fan 7 and the first intake ports 8, 8 ′ is different. Even when the plug-in unit 2 in which a plurality of heating elements (electronic elements A and B) are arranged on the printed circuit board 4 is replaced, in addition to the air from the first intake ports 8 and 8 ′, Since the air guided by the second air inlet 9 and the ducts 10, 10a, 10b, 10c, 10d is supplied in the vicinity of the intermediate position between the plurality of heating elements (electronic elements A, B) arranged in parallel, The cooling effect on the heating elements (electronic elements A and B) is constant, and high efficiency is maintained.

Next, the best embodiment in the present application will be described.
FIG. 1 is a partially cutaway perspective view of a first example of the electronic apparatus 1 of the present example, FIG. 2 is a partially cutaway perspective view of a second example of the electronic apparatus 1 ′ of the present example, and FIG. FIG. 4 is an enlarged perspective view showing the plug-in unit 2 of the electronic device 1, 1 ′ with different viewpoints, and FIG. 4 is a modification showing the plug-in unit 2 of the electronic device 1, 1 ′ with the viewpoint changed. 5 is an enlarged perspective view of an example, FIG. 5 is an enlarged perspective view of another modified example in which the viewpoint of the plug-in unit 2 of the electronic device 1, 1 ′ of the example is changed, and FIGS. It is sectional drawing which shows the specific structural example and modification of the duct 10 in an example.

The basic structure of the electronic apparatus of this example will be described with reference to FIGS.
The electronic device with the structure of this example assumes that a printed circuit board on which an electronic element as a heating element is mounted is used in common by exchanging it between a plurality of different cases, and is applied to, for example, a network measuring instrument. it can. In a network measuring instrument, a printed circuit board on which an electronic element as a heating element is mounted is used as one measuring unit (plug-in unit). This plug-in unit is portable and relatively small in number, for example, as shown in FIG. A plurality of plug-in units 2 are used by being inserted into a case 5 of a handy-type measuring instrument in which a set of plug-in units 2 is set. Can be used by being inserted into a housing 5 'of a large-sized measuring instrument.

  As shown in FIGS. 1 and 2, the plug-in unit 2 is inserted into the casings 5 and 5 ′ of the casings 5 and 5 ′ and installed in the casings 5 and 5 ′. A front panel 3 constituting a wall for closing 'openings 6 and 6', a printed circuit board 4 connected to the front panel 3, and a predetermined parallel arrangement direction on the printed circuit board 4 It includes electronic elements A and B (for example, CPU, FPGA, etc.) that are a plurality of heating elements. In this example, there are two electronic elements A and B, which are arranged side by side along a predetermined direction on the printed circuit board 4.

  In the plug-in unit 2 of this example shown in FIGS. 1 and 2, the front panel 3 is referred to as an intake port 9 (second intake port relative to intake ports 8 and 8 ′ of casings 5 and 5 ′ described later). ), And a duct 10 having a cylindrical shape (in the figure, a rectangular tube shape) whose one end communicates with the intake port 9 is provided on the printed board 4. The other end of the duct 10 serving as an outlet for the sucked air is opened to a gap between the two electronic elements A and B arranged side by side.

  As shown in FIG. 1, the first housing 5 (for a handy type network measuring instrument) has an opening 6 for removably inserting the plug-in unit 2 on a side surface which is a part of the wall. The connector part 15 into which the terminal part of the plug-in unit 2 is inserted is provided in the back of the opening part 6. The first housing 5 includes an exhaust fan 7 on the back surface, which is one wall surface, and a first intake port 8 on the front side of the bottom surface, which is another wall surface. Air that has entered the housing 5 from the first air inlet 8 by the exhaust fan 7 flows as indicated by arrows in the figure, and the housing is formed on the surface of the printed circuit board 4 of the plug-in unit 2 that is vertically stacked in a horizontal posture. The electronic elements A and B flow in this order from the front of 5 toward the back, and are discharged out of the housing 5 by the exhaust fan 7.

  As shown in FIG. 2, the second housing 5 ′ (for the installation type network measuring device) has an opening 6 for removably inserting the plug-in unit 2 into the front surface which is a part of the wall. A connector portion 15 into which a terminal portion of the plug-in unit 2 is inserted is provided at the back of the opening 6 ′. The second housing 5 ′ includes an exhaust fan 7 on the back surface, which is one wall surface, and a first intake port 8 ′ on the lower front portion, which is another wall surface. The air that has entered the housing 5 ′ from the first air inlet 8 ′ by the exhaust fan 7 flows as indicated by the arrow in the figure, and on the surface of the printed circuit board 4 of the plug-in unit 2 that is arranged horizontally in a vertical posture. The electronic elements B and A flow in this order from bottom to top and are discharged out of the housing 5 ′ by the exhaust fan 7.

  Since the plug-in unit 2 of the present example has the second air inlet 9 and the duct 10, as shown in FIGS. 1 and 2, the suction of the exhaust fan 7 in any of the casings 5 and 5 ′. As a result, air outside the casings 5 and 5 'is sucked from the second air inlet 9, and the air is guided to the duct 10 and supplied to the gap between the electronic elements A and B. Therefore, for example, in FIG. 1, if there is no air supply from the duct 10, the electronic element B downstream of the air flow receives the heat generated by the electronic element A. In this example, however, the air from the duct 10 Thus, the cooling effect of the electronic element B is improved, and both the electronic elements A and B are cooled with the same efficiency. The same applies to FIG. 2. If there is no air supply from the duct 10, the electronic element A downstream of the air flow receives the heat generated by the electronic element B, but in this example, the air from the duct 10. As a result, the cooling effect of the electronic element A is improved, and both the electronic elements A and B are cooled with the same efficiency.

3 to 5 show an example in which the heat sink 12 (12a to 12b) is thermally connected to the duct 10 in the basic structure of this example described with reference to FIGS.
However, in FIGS. 3 to 5, the electronic elements A and B are not parallel to the air flow direction in the housings 5 and 5 ′ by the exhaust fan 7 and the first air ports 8 and 8 ′, but in a direction orthogonal to each other. Are lined up. In this case, a cooling effect by the air from the duct 10 is additionally obtained regardless of the direction of air flow in the housing.

  As shown in FIG. 3, the duct 10 communicating with the air inlet 9 of the front panel 3 has a rectangular cross-sectional shape with an open upper surface in the figure, but this is for the convenience of illustration clearly showing the internal structure, Actually, the open upper surface is closed by a plate-like wall body, and has a rectangular tube shape as a whole. On the printed circuit board 4, two electronic elements A and B, which are heating elements, are arranged at a predetermined interval along the direction of air introduction by the duct 10. The heat sink 12a connected to the duct 10 is disposed on the two electronic elements A and B and thermally coupled thereto, and a central passage 13a along the air guiding direction by the duct 10 and air A number of rectangular convex shapes respectively provided on both sides of the passage 13a perpendicular to the guide direction (parallel to the air flow direction in the housing 5 by the exhaust fan 7 and the first air ports 8 and 8 '). It has a heat radiating part provided with fins 14a.

  According to this example, the air sucked from the air inlet 9 is guided to the duct 10 and guided to the heat sink 12a, and further passes through the passage 13a and the fin 14a of the heat radiating portion, and the heat from the electronic elements A and B is transferred. The accumulated heat of the heat radiating portion can be efficiently dissipated.

  The heat sink 12b of the modification shown in FIG. 4 has a triangular passage 13b as a whole whose width becomes narrower toward the back in the air introduction direction, and the lengths of a large number of rectangular convex fins 14b are also adjusted accordingly. It becomes longer as it goes to the back, and one continuous fin 14b closes the passage 13b in the innermost part. Other configurations are the same as those in the example of FIG.

  According to this example, efficient heat dissipation is possible as in the example of FIG. 3, and the width of the central passage 13b of the heat sink 12b is adjusted, so that electrons on the side close to the front panel 3 or the duct 10 are adjusted. The heat generated by the element B can be further radiated and cooled.

  In the modification shown in FIG. 5, two electronic elements A and B are arranged on the printed circuit board 4 in the same manner as in FIG. 3, but the housing 5 by the exhaust fan 7 and the first air ports 8 and 8 ′. Since there are some obstacles C and C (other electronic elements) at positions before and after the air flow direction in the interior, cooling by the exhaust fan 7 and the first air ports 8 and 8 ′ cannot be expected. In this case, the cooling depends only on the air from the duct 10 of this example. In the present modification, the heat sink 12c disposed on the electronic elements A and B includes an enlarged passage 13c that communicates with the duct 10 and whose width expands in the air supply direction, and a heat radiating portion adjacent to the enlarged passage 13c. . In the heat dissipating section of this example, a large number of rectangular convex fins 14c parallel to the air supply direction are arranged vertically and horizontally in front of the enlarged passage 13c so as to receive air and escape the air in the same direction as the supply direction. It is configured.

  According to this example, since there is an obstacle C before and after the electronic elements A and B, which are heating elements, in the direction of the normal air flow in the casings 5 and 5 ', the electrons are exclusively taken from the air taken from the duct 10. It is suitable for cooling the elements A and B, and since the air introduction direction by the duct 10 and the longitudinal direction of the fins 14c coincide with each other, the cooling effect is further enhanced.

6 and 7 show a more specific structural example of the cylindrical duct 10 in the basic structure of the present example described with reference to FIGS. 1 and 2.
A duct 10a shown in FIG. 6 (a) has a cylindrical structure in which a grooved member having a flange is disposed on the upper surface of the printed circuit board 4 and the flange is fixed to the printed circuit board 4 by fastening means 16. That is, a part of the wall surface constituting the cylindrical duct 10 is shared by the printed circuit board 4.

  A duct 10b shown in FIG. 6 (b) is a groove having a U-shaped cross section without a flange, in which a part of the wall surface constituting the cylindrical duct 10 is also used as the printed board 4 as in FIG. 6 (a). The shape member is fixed on the upper surface of the printed circuit board 4 by soldering.

  A duct 10c shown in FIG. 7 (a) attaches a second printed circuit board 11 as a plate member in parallel to the printed circuit board 4 through a support column 17, and a pair of plate materials are spaced between the substrates 4 and 11 at a predetermined interval. Are arranged and fastened to the printed circuit board 4, and a cylindrical structure is partitioned by these structures.

In the duct 10d shown in FIG. 7 (b), the pair of facing wall surfaces constituting the cylindrical duct 10 are shared by the printed circuit board 4 and the second printed circuit board 11 as a plate member, as in FIG. 7 (a). A pair of plate materials that form a pair of side walls between the pair of printed circuit boards 4 and 11 are fixed to the upper surface of the printed circuit board 4 by soldering.
In addition, although the 2nd printed circuit board 11 provided with the electrical structure was employ | adopted as a board | plate material which is a structural member which comprises a part of duct, other than this, electrical wiring, such as a metal board | plate material and a plastic board | plate material It is also possible to use a plate material as a structural member that does not have any.

  In the example described above, the air drawn from the second air port 9 provided in the front panel 3 of the plug-in unit 2 and guided by the duct 10 is sent to the electronic elements A, In the case where there are a plurality of electronic elements A and B, which are heat generating elements, and these are arranged in parallel in the direction of air flow in the casings 5 and 5 ′. Has replaced the plug-in unit 2 with other casings 5 and 5 ′ in which the air flow direction is opposite by supplying the air guided by the duct 10 to the intermediate portions of the plurality of electronic elements A and B. In this case, the cooling state of each of the electronic elements A and B is made uniform, but in addition to this, a part other than the central part of the plurality of electronic elements arranged along a predetermined direction (for example, arranged in a row) The vicinity of the electronic element at the end of multiple telegraph elements, etc. Even if the air guided by the duct 10 is supplied to the air, at least the supplied part and the downstream part of the air flow in the casings 5 and 5 ′ are supplied through the duct 10. The cooling effect of minutes can be additionally expected.

  Further, the example described above shows a case where there are two electronic elements as heating elements to be cooled, and as described above, the present invention can also be applied to a case where there are three or more heating elements. However, it is needless to say that the present invention can achieve a considerable effect even when applied to a case where there is only one heating element. For example, in the embodiment described above, when the electronic device 1, 1 ′ has only a single electronic element A or electronic element B as a heating element, the air guided by the duct is used as the heating element. The air may be guided directly to the cooling body, or air may be led by a duct to the vicinity of the heating element (upstream of the heating element along the air flow in the casing), and the air flows along with the air flow in the casing. May be supplied.

FIG. 1 is a partially cutaway perspective view of a first example of the electronic apparatus of this example. FIG. 2 is a partially cutaway perspective view of a second example of the electronic apparatus of this example. FIG. 3 is an enlarged perspective view showing the plug-in unit of the electronic apparatus of this example with a different viewpoint. FIG. 4 is an enlarged perspective view of a modified example represented by changing the viewpoint of the plug-in unit of the electronic apparatus of this example. FIG. 5 is an enlarged perspective view of another modified example in which the viewpoint of the plug-in unit of the electronic apparatus of the present example is changed. FIG. 6 is a sectional view showing the structure of the duct in this example. FIG. 7 is a sectional view of a modification showing the structure of the duct in this example. FIG. 8 is a partially cutaway perspective view of a first example of a conventional electronic device. FIG. 2 is a partially cutaway perspective view of a second example of a conventional electronic device.

Explanation of symbols

1,1 'electronic equipment
2 Plug-in unit 3 Front panel 4 First printed circuit board 5, 5 ′ Case 6, 6 ′ Opening 7 Exhaust fan 8, 8 ′ First intake port 9 Second intake port 10, 10 a, 10 b, 10 c Duct 11 Second printed circuit board 12 as plate member 12, 12a, 12b, 12c Heat sink 13a, 13b, 13c Passage 14a, 14b, 14c Fin 15 Connector portion

Claims (6)

A plug-in unit (2) including a front panel (3), a printed circuit board (4) connected to the front panel, and a heating element (A or B) fixed to the printed circuit board;
It has an opening (6, 6 ') for inserting the plug-in unit, and has an exhaust fan (7) on one wall surface and a first air inlet (8, 8') on the other wall surface. In the electronic device (1, 1 ′) including the housing (5, 5 ′),
A second air inlet (9) provided in the front panel;
A duct (10, 10a, 10b, 10c, 10d) provided on the printed circuit board for guiding the outside air introduced from the second air inlet to the heating element or the vicinity thereof. Electronic equipment (1, 1 '). The electronic device (1, 1 ') according to claim 1, characterized in that the duct (10, 10a, 10b, 10c, 10d) is cylindrical. The electronic device (1, 1 ') according to claim 2, wherein a part of a wall surface constituting the duct (10, 10a, 10b, 10c, 10d) is constituted by the printed circuit board (4). . The opposite side of the duct (10, 10a, 10b, 10c, 10d) from the printed circuit board (4) is opened, and the plate member (11) is mounted on the surface of the printed circuit board on which the duct is provided. The electronic device (1, 1 ') according to claim 3, wherein the duct is formed in a cylindrical shape. The electronic device (1, 1 ') according to any one of claims 1 to 4, wherein the duct (10, 10a, 10b, 10c, 10d) is thermally connected to a heat sink (12a, 12b, 12c). . A plug-in unit including a front panel (3), a printed circuit board (4) connected to the front panel, and a plurality of heating elements (A, B) provided on the printed circuit board in a predetermined parallel arrangement direction (2) and
It has an opening (6, 6 ') for inserting the plug-in unit in a replaceable manner, has an exhaust fan (7) on one wall surface, and a first intake port (8, 8' on the other wall surface. And a housing (5, 5 ′) configured to allow air to flow in a constant direction along the direction in which the heating elements of the inserted plug-in unit are juxtaposed,
By selecting the casing into which the plug-in unit is inserted, the direction of air flow in the casing is reversed with respect to the juxtaposed direction of the heating elements of the plug-in unit inserted into the casing. In the configured electronic device (1, 1 ′),
A second air inlet (9) provided in the front panel;
Ducts (10, 10a, 10b, 10c, 10d) which are provided on the printed circuit board and lead outside air introduced from the second air intake port in the vicinity of an intermediate position between the plurality of heating elements arranged in parallel. And an electronic device.

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