Housing and electronic device

Abstract

This housing comprises: an outer shell member; a ventilation path that is formed in the main surface of the outer shell member and that is composed of a recess that reaches to the outer peripheral edge of the main surface; and a ventilation opening that is formed in a side surface of the recess. The ventilation path communicates with the interior of the housing via the ventilation opening and reaches to the outer peripheral edge of the main surface.

Description

Housing and Electronics

[0001] The present disclosure relates to a housing and an electronic device.

[0002] Japanese Patent Publication No. 6984182 discloses an electronic device having a waterproof housing with an internal ventilation fan. The waterproof housing is composed of a case and a cover that can be separated from each other. The cover is attached to the case so as to cover the ventilation fan attached to the wall of the case. The case has a ventilation hole that penetrates through the thickness of the case.

[0003] Recently, there has been a demand for maintaining good cooling performance.

[0004] The present invention aims to solve the above-mentioned problems.

[0005] A first aspect of the present disclosure is a housing equipped with a fan therein, comprising: an outer shell member; an air passage formed in a main surface of the outer shell member and constituted by a recess that reaches the outer peripheral edge of the main surface; and an air vent formed on a side surface of the recess, wherein the air passage communicates with the interior of the housing via the air vent and reaches the outer peripheral edge of the main surface.

[0006] A second aspect of the present disclosure is an electronic device comprising the housing according to the first aspect and the fan provided inside the housing.

[0007] FIG. 1 is an exploded perspective view of an electronic device according to a first embodiment. FIG. 2 is an exploded perspective view of a second housing member and a fan. FIG. 3 is a view showing a state in which the fan is attached. FIG. 4 is a cross-sectional view of the electronic device taken along line IV-IV in FIG. 1. FIG. 5 is an exploded perspective view of an electronic device according to a second embodiment. FIG. 6 is a cross-sectional view of the electronic device taken along line VI-VI in FIG. 5. FIG. 7 is a cross-sectional view of an electronic device according to a third embodiment. FIG. 8 is a cross-sectional view of an electronic device according to a fourth embodiment. FIG. 9 is a diagram of an electronic device according to a fifth embodiment. FIG. 10 is a diagram of an electronic device according to a sixth embodiment.

[0008] In order to make the housing thinner, a fan may be attached to the main surface (top or bottom) of the housing. A vent is formed in the housing to cool the interior of the housing with the fan. If the vent is blocked, the cooling performance of the fan for the interior of the housing is reduced. If the vent penetrates the main surface of the housing, good cooling performance cannot be maintained unless space is secured outside the vent. Therefore, if a vent is simply formed on the main surface of the housing, an object cannot be placed on the main surface of the housing. The present disclosure proposes a housing and an electronic device that can maintain good cooling performance even when a vent is formed on the main surface of the housing.

[0009] First Embodiment FIG. 1 is an exploded perspective view of an electronic device 10 according to a first embodiment. The electronic device 10 is a numerical control device, but is not limited to this. The electronic device 10 is installed in an industrial machine (not shown). The industrial machine may be a machining center, a lathe, an electric discharge machine, or the like. The electronic device 10 includes a housing 12, an electronic circuit board (heat generating element) 14, and a fan 16.

[0010] The housing 12 includes a first housing member (first outer shell member) 18 and a second housing member (second outer shell member) 20. The electronic circuit board 14 is fixed to the first housing member 18. The fan 16 is fixed to the second housing member 20. The first housing member 18 and the second housing member 20 are combinable. The housing 12 is configured by combining the first housing member 18 and the second housing member 20. When the first housing member 18 and the second housing member 20 are combined, the housing 12 is formed, for example, in a substantially rectangular parallelepiped shape. When the first housing member 18 and the second housing member 20 are combined, the fan 16 fixed to the second housing member 20 and the electronic circuit board 14 fixed to the first housing member 18 are electrically connected by wiring, connectors, etc. (not shown).

[0011] The first housing member 18 has a main surface (bottom surface, lower surface) 22, a first side surface 24, a second side surface 26, a third side surface 28, and a fourth side surface 30. The second side surface 26 and the third side surface 28 are each arranged along the short-side direction D1 of the housing 12. The second side surface 26 is located opposite the third side surface 28. The first side surface 24 and the fourth side surface 30 are each arranged along the long-side direction D2 of the housing 12. The fourth side surface 30 is located opposite the first side surface 24. A connector connection opening 32 for connecting connectors is formed in the fourth side surface 30. A plurality of external connection connectors 34 are located in the connector connection opening 32. An external device (not shown) can be connected to the external connection connectors 34 via a cable (not shown). In the example of FIG. 1 , four external connection connectors 34 are provided, but this is not limiting. Alternatively, the connector connection opening 32 may not be formed, and the external connection connectors 34 may not be provided.

[0012] The second housing member 20 has a main surface (top surface, upper surface) 36 and ventilation passages 38 (38A, 38B). In FIG. 1, two ventilation passages 38A, 38B are provided, but one of the two ventilation passages 38A, 38B may be omitted. In this case, there is only one ventilation passage 38. The ventilation passages 38A, 38B communicate with the interior of the housing 12 via ventilation openings 42A, 42B, respectively, and reach an outer peripheral edge 44 of the main surface 36. The ventilation passage 38 is defined by recesses 46 (46A, 46B).

[0013] The recess 46 is formed in the main surface 36. The recess 46 extends in a direction along the short-side direction D1 of the housing 12. One end of the recess 46A is connected to the vent 42A. The other end of the recess 46A reaches the outer peripheral edge 44 of the main surface 36. One end of the recess 46B is connected to the vent 42B. The other end of the recess 46B reaches the outer peripheral edge 44 of the main surface 36. A bottom surface 48 of the recess 46 is lower than an outer surface 50 of the main surface 36. The vent 42 is located between the bottom surface 48 of the recess 46 and the outer surface 50 of the main surface 36. The vent 42 is formed at the end of a side surface 52 of the recess 46 in the direction in which the recess 46 extends. The side surface 52 is aligned along the thickness direction D3 of the housing 12, but is not limited to this.

[0014] The electronic circuit board 14 is accommodated inside the housing 12 while being fixed to the first housing member 18. A plurality of electronic components are mounted on a main surface 54 of the electronic circuit board 14. The electronic components include an external connection connector 34, a fan connection connector 56, and a control circuit 58 for controlling the industrial machine.

[0015] As shown in Figure 2, the fan 16 is an axial flow fan. The fan 16 has a fan body 60, a fan frame 62, and a fan connector 64. The fan body 60 has a rotating shaft 66 and a plurality of fan blades 68. The fan blades 68 rotate in response to rotation of the rotating shaft 66. The fan frame 62 is provided to surround the sides of the plurality of fan blades 68. The fan connector 64 is connected to the fan body 60 via wiring 69. The fan connector 64 is formed to be able to fit into the fan connector 56 (Figure 1).

[0016] A plurality of insertion openings 70 are formed in the fan frame 62. Each of the plurality of insertion openings 70 extends in a direction along the rotation axis 66. In Fig. 2, the insertion openings 70 are through-holes that penetrate the fan frame 62, but the present invention is not limited to this. Also, in Fig. 2, the number of the plurality of insertion openings 70 is four, but the present invention is not limited to this.

[0017] The fan 16 is fixed to a fan mounting mechanism 72. The fan mounting mechanism 72 is provided in the second housing member 20. Specifically, the fan mounting mechanism 72 is provided in a fan mounting area AR on an inner surface 78 of the main surface 36.

[0018] The fan mounting area AR is an area where the fan 16 is mounted. The fan mounting area AR is formed in a shape corresponding to the shape of the fan 16. In FIG. 2, the fan mounting area AR is formed in a rectangular shape, but is not limited to this. The fan mounting area AR is disposed between the air vent 42A and the air vent 42B. Although not shown, if there is one air passage 38, the air vent 42 will be either the air vent 42A or the air vent 42B. In this case, the fan mounting area AR is disposed adjacent to one of the air vents 42.

[0019] The fan mounting mechanism 72 has multiple pillars 74 and a locking portion 76. The multiple pillars 74 protrude from an inner surface 78 of the main surface 36. The multiple pillars 74 correspond to the multiple insertion openings 70 formed in the fan frame 62. The multiple pillars 74 are inserted into the multiple insertion openings 70, respectively. The multiple pillars 74 include a pair of first pillars 74X and a pair of second pillars 74Y. The pair of first pillars 74X are arranged at diagonal corners (first diagonal) of the fan mounting area AR. The pair of second pillars 74Y are arranged at diagonal corners (second diagonal) of the fan mounting area AR. The dimension from the inner surface 78 to the protruding end of the first pillars 74X is greater than the dimension from the inner surface 78 to the protruding end of the second pillars 74Y.

[0020] The locking portion 76 protrudes from an inner surface 78 of the main surface 36. In FIG. 2, two locking portions 76 protrude from the inner surface 78. A first locking portion 76X, which is one of the two locking portions 76, and a second locking portion 76Y, which is the other of the two locking portions 76, are arranged facing each other. The number of locking portions 76 may be one, or may be three or more. For example, when there is one locking portion 76, the locking portion 76 is arranged to surround the fan mounting area AR.

[0021] An engagement claw 80 is formed on the locking portion 76 between the base end and the protruding end. As shown in FIG. 3 , when each of the multiple columnar portions 74 is inserted into the insertion port 70 for the fan 16, the engagement claw 80 engages with the fan 16. This allows the locking portion 76 to lock the fan 16, and the fan 16 is fixed to the main surface 36. The engagement claw 80 is formed on the locking portion 76 so as to engage with the fan 16 that is arranged without contacting the inner surface 78 of the main surface 36. In FIG. 3 , the engagement claw 80 engages with the end surface of the fan 16 in the direction in which the rotation shaft 66 extends, but this is not limiting. For example, the engagement claw 80 may engage with a recessed portion formed in the side surface of the fan frame 62.

[0022] 2 and 3, a spacer 82 is provided in the fan mounting area AR. The spacer 82 protrudes from the inner side surface 78 of the main surface 36. In FIG. 2, two spacers 82 are provided in the fan mounting area AR, but this is not limiting. Also, in FIG. 2, the spacer 82 is provided separately from the columnar portion 74, but it may be provided in contact with the columnar portion 74, for example.

[0023] 3 , the dimension from the inner surface 78 to the protruding end of the spacer 82 is smaller than the dimension from the inner surface 78 to the protruding end of the columnar portion 74. The fan 16 is fixed to the second housing member 20 in contact with the protruding end of the spacer 82. The spacer 82 forms a gap GP between the fan 16 fixed to the second housing member 20 and the inner surface 78 of the second housing member 20.

[0024] As shown in FIG. 2 , a standing wall portion 84 is provided in the fan mounting area AR. The standing wall portion 84 protrudes from the inner surface 78 of the main surface 36. The standing wall portion 84 is formed to surround the fan 16 except for the area between the fan 16 and the vent hole 42. In FIG. 2 , the vent hole 42A is disposed on the edge of a first side S1 of the rectangular fan mounting area AR that extends in the longitudinal direction D2 of the housing 12. The vent hole 42B is disposed on the edge of a second side S2 of the rectangular fan mounting area AR that is opposite the first side S1. Therefore, the standing wall portion 84 is formed to surround a third side S3 and a fourth side S4 of the rectangular fan mounting area AR that extend in the lateral direction D1 of the housing 12. Although not shown, when there is only one air passage 38, the single air passage 38 is disposed, for example, on the edge of the first side S1. In this case, the standing wall portion 84 is formed so as to surround the second side S2, the third side S3, and the fourth side S4.

[0025] 3 , the dimension from the inner surface 78 to the protruding end of the standing wall portion 84 is greater than the dimension from the inner surface 78 to the protruding end of the spacer 82. On the other hand, the dimension from the inner surface 78 to the protruding end of the standing wall portion 84 is smaller than the dimension from the inner surface 78 to the protruding end of the columnar portion 74.

[0026] Fig. 4 is a cross-sectional view of the electronic device 10 taken along line IV-IV in Fig. 1. In Fig. 4, the electronic device 10 is shown schematically, and the airflow when the fan 16 is driven is indicated by arrows.

[0027] When the fan 16 is driven, air inside the housing 12 is exhausted to the outside of the housing 12. That is, the fan 16 draws in air from a portion of the fan 16 facing the main surface 54 of the electronic circuit board 14 and exhausts the drawn-in air toward the inner surface 78 of the main surface 36. The air exhausted from the fan 16 flows through the air vent 42 and the air passage 38, and is released via the outer circumferential edge 44 of the main surface 36. Although not shown, the air intake and exhaust directions of the fan 16 may be reversed. In this case, the arrows indicating the airflow would be reversed.

[0028] As described above, in the housing 12 of this embodiment, the ventilation path 38 is defined by the recess 46 formed in the main surface 36. The ventilation path 38 reaches the outer peripheral edge 44 of the main surface 36 through the ventilation opening 42 formed in the side surface 52 of the recess 46. This positions the entire ventilation path 38 lower than the outer surface 50 of the main surface 36. Therefore, even if another housing 12X or the like is placed on the main surface 36, ventilation can be achieved between the inside and outside of the housing 12 via the ventilation path 38. As a result, good cooling performance can be maintained.

[0029] The housing 12 of this embodiment also includes a spacer 82 that protrudes from the inner surface 78 of the main surface 36. The fan 16 is fixed to the main surface 36 in contact with the protruding end of the spacer 82. This allows a gap GP (FIG. 3) to be formed between the fan 16 and the inner surface 78. This prevents a reduction in the amount of intake and exhaust air by the fan 16.

[0030] The housing 12 of this embodiment also includes a standing wall portion 84 that protrudes from the inner surface 78 of the main surface 36. The standing wall portion 84 is formed to surround the fan 16 except for the area between the fan 16 and the vent hole 42. This ensures that air is ventilated through the vent hole 42, ensuring good cooling performance.

[0031] Second Embodiment In a second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and a description of the second embodiment that overlaps with the above description will be omitted.

[0032] As shown in Fig. 5, the housing 12 of this embodiment has another ventilation hole 90 formed in addition to the ventilation hole 42. Although Fig. 5 shows a plurality of ventilation holes 90, this is not limiting. The ventilation hole 90 penetrates the main surface 36 along the thickness direction D3 of the housing 12. The ventilation hole 90 overlaps with the fan 16 in a plan view. The ventilation hole 90 is located within the fan mounting area AR (Fig. 2).

[0033] Fig. 6 is a cross-sectional view of the electronic device 10 taken along line VI-VI in Fig. 5. In Fig. 6, the electronic device 10 is shown schematically, and the airflow when the fan 16 is driven is indicated by arrows.

[0034] A portion of the air exhausted from the fan 16 is discharged to the outside of the housing 12 through the vent 90. Another portion of the air exhausted from the fan 16 flows through the air passage 38 via the vent 42 and is discharged to the outside of the housing 12 via the outer circumferential edge 44 of the main surface 36. Although not shown, the intake and exhaust of air by the fan 16 may be reversed. In this case, the direction of the arrows indicating the airflow would be reversed.

[0035] In this way, the housing 12 of this embodiment is provided with another ventilation hole 90 in addition to the ventilation hole 42. This makes it possible to increase the amount of ventilation between the inside of the housing 12 and the outside of the housing 12.

[0036] (Third Embodiment) In the third embodiment, components equivalent to those in the first embodiment are denoted by the same reference numerals as those used in the first embodiment. In the third embodiment, descriptions that overlap with those described above will be omitted. Fig. 7 is a cross-sectional view of an electronic device 10 according to the third embodiment. In Fig. 7, the electronic device 10 is schematically shown, and the arrows indicate the airflow when the fan 16 is driven.

[0037] As shown in FIG. 7 , the housing 12 of this embodiment has one air passage 38. The housing 12 of this embodiment also has a mounting portion 92 to which the fan 16 is attached. The mounting portion 92 corresponds to the spacer 82 described above, but has a different shape from the spacer 82 described above. The mounting portion 92 is formed so that the distance DT1 between the fan 16 and the main surface 36 increases toward the vent 42. As a result, the fan 16 is inclined away from the main surface 36 toward the vent 42. This improves the airflow between the fan 16 and the vent 42.

[0038] The fan 16 is fixed to the main surface 36 in a state in which it is inclined so as to move away from the main surface 36 as it approaches the vent 42. Therefore, in this embodiment, the plurality of columnar portions 74 ( FIG. 2 ) and the locking portion 76 ( FIG. 2 ) are arranged in a state in which they are inclined.

[0039] (Fourth Embodiment) In the fourth embodiment, components equivalent to those in the first embodiment are assigned the same reference numerals as those used in the first embodiment. In the fourth embodiment, descriptions that overlap with those described above will be omitted. Fig. 8 is a cross-sectional view of an electronic device 10 according to the fourth embodiment. In Fig. 8, the electronic device 10 is schematically shown, and the arrows indicate the airflow when the fan 16 is driven.

[0040] The housing 12 of this embodiment has one air passage 38. Furthermore, the housing 12 of this embodiment is provided with an airflow guide 94 on the inner side surface 78 of the main surface 36. The airflow guide 94 has a guide surface 96 that guides the airflow. The guide surface 96 is inclined with respect to the inner side surface 78. The distance DT2 between the guide surface 96 and the fan 16 increases toward the air vent 42. This improves the air permeability between the fan 16 and the air vent 42.

[0041] Fifth Embodiment In the fifth embodiment, components equivalent to those in the first embodiment are denoted by the same reference numerals as those used in the first embodiment. In the fifth embodiment, descriptions that overlap with those described above will be omitted. FIG. 9 is a diagram of an electronic device 10 according to the fifth embodiment. In FIG. 9, the electronic device 10 is schematically shown.

[0042] In the housing 12 of this embodiment, the connector connection opening 32 ( FIG. 1 ) is not formed in the fourth side surface 30. Furthermore, the housing 12 of this embodiment has only one ventilation path 38. The recess 46 reaches a first edge 44A of the outer peripheral edge 44 of the main surface 36 and a second edge 44B adjacent to the first edge 44A. In other words, the ventilation path 38 communicates with the interior of the housing 12 via the ventilation opening 42 and reaches the first edge 44A and the second edge 44B. This increases the amount of ventilation between the interior and exterior of the housing 12.

[0043] Sixth Embodiment In the sixth embodiment, components equivalent to those in the first embodiment are denoted by the same reference numerals as those used in the first embodiment. In the sixth embodiment, descriptions that overlap with those described above will be omitted. Fig. 10 is a diagram of an electronic device 10 according to the sixth embodiment. In Fig. 10, the electronic device 10 is schematically shown.

[0044] In the housing 12 of this embodiment, the connector connection opening 32 ( FIG. 1 ) is not formed in the fourth side surface 30. Furthermore, the housing 12 of this embodiment has only one air passage 38. The recess 46 extends in the direction along the longitudinal direction D2 of the housing 12. The housing 12 of this embodiment also provides the same effects as the first embodiment.

[0045] (Modification of the embodiment) In the above embodiment, the air passage 38 is formed on the main surface 36 of the second housing member 20, but it may be formed on the main surface 22 of the first housing member 18. In this case, although not shown, the electronic circuit board 14 may be disposed in a location excluding the fan mounting area AR.

[0046] Furthermore, in the above embodiment, the case where there is one electronic circuit board 14 has been described as an example, but a plurality of electronic circuit boards 14 may be provided.

[0047] Effect of the Embodiment As described above, in the housing 12 of the above embodiment, a recess 46 is formed in the main surface of the outer shell member (the main surface 36 of the second housing member 20 or the main surface 22 of the first housing member 18). This recess 46 defines the ventilation path 38. The ventilation path 38 reaches the outer peripheral edge 44 of the main surface 36 via the ventilation opening 42 formed in the side surface 52 of the recess 46. As a result, even if an object is placed close to the main surface of the outer shell member, the ventilation path 38 is not blocked by the object, and the inside and outside of the housing 12 can communicate via the ventilation path 38. As a result, good cooling performance can be maintained.

[0048] The following additional notes are further disclosed regarding the above embodiment.

[0049] (Supplementary Note 1) The housing (12) of the present disclosure is a housing equipped with a fan (16) therein, and comprises outer shell members (18, 20), an air passage (38) constituted by a recess (46) formed in a main surface (22, 36) of the outer shell member and reaching an outer peripheral edge (44) of the main surface, and an air vent (42) formed in a side surface (52) of the recess, and the air passage communicates with the interior of the housing via the air vent and reaches the outer peripheral edge of the main surface.

[0050] [Correction under Rule 91 10.04.2025] (Appendix 2) The housing as described in Appendix 1 may also comprise a fan mounting mechanism (72) provided on the inner surface (78) of the main surface, which engages the fan without the fan contacting the inner surface of the main surface.

[0051] [Correction based on Rule 91 10.04.2025] (Appendix 3) In the housing described in Appendix 2, the fan mounting mechanism may comprise a plurality of pillar portions (74) and a locking portion (76), and when the plurality of pillar portions are inserted into the fan, an engaging claw (80) formed on the locking portion may engage with the fan.

[0052] (Supplementary Note 4) The housing according to Supplementary Note 1 may further include a spacer (82) protruding from an inner surface of the main surface, and the fan may be fixed to the main surface in a state of contact with a protruding end of the spacer.

[0053] (Supplementary Note 5) The housing according to Supplementary Note 1 may further include a standing wall portion (84) formed to surround the fan in a region other than between the fan and the vent and protruding from an inner surface of the main surface.

[0054] (Supplementary Note 6) In the housing according to Supplementary Note 1, another vent (90) that overlaps with the fan in a plan view may be formed in the main surface.

[0055] (Supplementary Note 7) The housing according to Supplementary Note 1 may be provided with a mounting portion (92) on the inner surface of the main surface to which the fan is attached, and the mounting portion may be formed so that a distance (DT1) between the fan and the main surface increases toward the ventilation opening.

[0056] (Supplementary Note 8) In the housing described in Supplementary Note 1, an airflow guide (94) having a guide surface (96) for guiding the airflow is provided on the inner surface of the main surface, and a distance (DT2) between the guide surface and the fan may increase toward the air vent.

[0057] (Appendix 9) In the housing described in Appendix 1, the recess may reach a first edge (44A) of the outer circumferential edge and a second edge (44B) adjacent to the first edge, and the ventilation path may communicate with the interior of the housing via the ventilation opening and reach the first edge and the second edge.

[0058] (Supplementary Note 10) An electronic device (10) of the present disclosure includes the housing according to any one of Supplementary Notes 1 to 9, and the fan provided inside the housing.

[0059] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values ​​or mathematical expressions are used in the description of the above-described embodiments.

[0060] DESCRIPTION OF SYMBOLS 10...Electronic device 12...Housing 14...Electronic circuit board 16...Fan 18...First housing member (outer shell member) 20...Second housing member (outer shell member) 22...Main surface (bottom surface) 36...Main surface (top surface) 38...Ventilation path 42, 90...Ventilation opening 44...Outer rim 46...Recess 50...Outer surface 52...Side surface 72...Fan mounting mechanism 74...Column-shaped portion 76...Latching portion 78...Inner surface 80...Engaging claw 82...Spacer 84...Upright wall portion 92...Mounting portion 94...Ventilation guide 96...Guide surface

Claims

1. A housing equipped with a fan therein, comprising: an outer shell member; an air passage formed in a main surface of the outer shell member and constituted by a recess that reaches the outer peripheral edge of the main surface; and an air vent formed in a side surface of the recess, wherein the air passage communicates with the interior of the housing via the air vent and reaches the outer peripheral edge of the main surface.

2. A housing according to claim 1, comprising a fan mounting mechanism provided on the inner surface of said main surface, for engaging said fan without said fan contacting the inner surface of said main surface.

3. A housing as claimed in claim 2, wherein the fan mounting mechanism comprises a plurality of pillars and a locking portion, and when the plurality of pillars are inserted into the fan, an engagement claw formed on the locking portion engages with the fan.

4. A housing according to claim 1, comprising a spacer protruding from the inner surface of said main surface, said fan being fixed to said main surface in a state of contact with the protruding end of said spacer.

5. A housing according to claim 1, comprising a standing wall portion formed to surround the fan in a region other than the region between the fan and the vent and protruding from the inner surface of the main surface.

6. A housing according to claim 1, wherein another vent hole overlapping the fan in a plan view is formed in the main surface.

7. A housing as claimed in claim 1, wherein the inner surface of the main surface is provided with a mounting portion to which the fan is attached, and the mounting portion is formed so that the distance between the fan and the main surface increases towards the ventilation opening.

8. A housing according to claim 1, wherein the inner surface of the main surface is provided with a ventilation guide having a guide surface for guiding the airflow, and the distance between the guide surface and the fan increases toward the ventilation opening.

9. A housing as claimed in claim 1, wherein the recess reaches a first edge of the outer periphery and a second edge adjacent to the first edge, and the ventilation path communicates with the interior of the housing via the ventilation opening and reaches the first edge and the second edge.

10. An electronic device comprising: a housing according to any one of claims 1 to 9; and a fan provided inside the housing.

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