JP2021082697A - Electronic device - Google Patents

Abstract

To provide an electronic device which allows higher degree of freedom in fastening a fastening member to a first case part for the purpose of downsizing.SOLUTION: An electronic device 1 comprises a circuit board 2, a case 3, and a fastening member 4. The case 3 has: a first case part 3A in which the circuit board 2 is disposed; and a second case part 3B which is fitted to the first case part 3A via their mating surfaces 301 so as to house, together with the first case part 3A, the circuit board 2. The fastening member 4 is fastened to a fastening surface 341, which is formed on a lateral part 33 of the first case part 3A in a manner perpendicular to the mating surfaces 301, with a plurality of screws 44. The first case part 3A is provided with a plurality of protrusions 35 which protrude from the mating surface 301 of the first case part 3A to the second case part 3B side so as to form a portion of the fastening surface 341. The fastening member 4 is partially fastened to the portion of the fastening surface 341 formed by the protrusion 35.SELECTED DRAWING: Figure 2

Description

The present invention relates to an electronic device in which a circuit board is housed in a case.

An electronic device used as a power converter, a charger, or the like includes a circuit board on which an electronic circuit is formed, and a case including a pair of a first case portion and a second case portion for accommodating the circuit board. Further, a fastening member such as a connector that relays the wiring of the circuit board is fastened to the first case portion or the second case portion. The fastening member is often fastened to the side portion of the first case portion or the second case portion due to the limitation of the space for arranging the electronic device.

As an example of an electronic device, for example, in the photographing apparatus of Patent Document 1, a structure in which an electronic board is housed inside a case and a connector for relaying wiring of the electronic board is attached to a side portion of the case is described. There is.

Japanese Unexamined Patent Publication No. 2018-182625

For example, in an electronic device mounted on a vehicle, there is a demand to make the physique (outer shape) as small as possible due to space restrictions on a portion of the vehicle on which the electronic device is mounted. Specifically, in an electronic device in which a fastening member is fastened to a side portion of the first case portion that is parallel to the mating direction in which the first case portion and the second case portion meet, the direction of the overall mating direction of the electronic components There is a demand for smaller dimensions.

In particular, when the dimension of the fastening member in the mating direction is larger than the maximum dimension in the mating direction of the first case portion, the entire electronic device is aligned depending on the fastening position of the fastening member in the mating direction with respect to the first case portion. Directional dimensions may increase. Therefore, even in such a case, in order to keep the dimensions of the electronic device small, it is effective to increase the degree of freedom in how to fasten the fastening member to the first case portion. There is room for further improvement in the method of fastening the fastening member to the first case portion.

The present invention has been made in view of the above problems, and has been obtained in an attempt to provide an electronic device capable of increasing the degree of freedom in how to fasten a fastening member to the first case portion for the purpose of miniaturization. Is.

One aspect of the present invention is a circuit board (2) on which an electronic circuit is formed.
A second case portion that is fitted to the first case portion (3A) on which the circuit board is arranged and the first case portion by a mating surface (301) with each other to accommodate the circuit board together with the first case portion. Case with (3B) and
A fastening member (4) to be fastened by a plurality of screws (44) is provided on a fastening surface (341) formed on the side portion (33) of the first case portion orthogonal to the mating surface.
The first case portion is provided with one or a plurality of projecting portions (35) that project from the mating surface of the first case portion to the side of the second case portion and form a part of the fastening surface. Ori,
A part of the fastening member is in an electronic device (1) that is fastened to a portion of the fastening surface formed on the protruding portion.

In the electronic device, when the fastening member is fastened to the fastening surface on the side portion of the first case portion by a screw, the fastening position of the fastening member is devised.
Specifically, on the side portion of the first case portion, a protruding portion is formed so as to project from the mating surface of the first case portion and the second case portion to the side of the second case portion, and a part of the fastening surface. Is formed on the protrusion. Further, a part of the fastening member is fastened to a part of the fastening surface formed on the protruding portion, and is located on the side of the second case portion from the mating surface.

With these configurations, it is possible to adjust the fastening position in the matching direction of the fastening member with respect to the first case portion, and it is possible to increase the degree of freedom in the method of fastening the fastening member to the first case portion. Further, for example, when the maximum dimension in the mating direction of the fastening member is larger than the maximum dimension in the mating direction of the first case portion, by adopting these configurations, the dimension in the mating direction of the electronic device is kept small. can do.

Therefore, according to the electronic device, it is possible to increase the degree of freedom in how to fasten the fastening member to the first case portion for the purpose of miniaturization.

The reference numerals in parentheses of each component shown in one aspect of the present invention indicate the correspondence with the reference numerals in the drawings in the embodiment, but the respective components are not limited to the contents of the embodiment.

FIG. 1 is a perspective view showing an electronic device in a state in which the second case portion is removed according to the first embodiment. FIG. 2 is a cross-sectional view showing an electronic device according to the first embodiment. FIG. 3 is a plan view showing an electronic device in a state in which the second case portion is removed according to the first embodiment. FIG. 4 is a side view showing an electronic device according to the first embodiment, in which the fastening surface of the first case portion in a state where the fastening member is removed is viewed vertically. FIG. 5 is a side view showing an electronic device according to the first embodiment, in which the other fastening surface of the first case portion in a state where the fastening member is removed is viewed vertically. FIG. 6 is a cross-sectional view showing another electronic device according to the first embodiment. FIG. 7 is a cross-sectional view showing an electronic device according to a comparative form. FIG. 8 is a cross-sectional view showing an electronic device according to the second embodiment. FIG. 9 is a plan view showing an electronic device in a state in which the second case portion is removed according to the third embodiment. FIG. 10 is a plan view showing another electronic device according to the third embodiment in a state where the second case portion is removed.

A preferred embodiment of the electronic device described above will be described with reference to the drawings.
<Embodiment 1>
As shown in FIGS. 1 to 4, the electronic device 1 of this embodiment includes a circuit board 2, a case 3, and a fastening member 4. The circuit board 2 is formed with an electronic circuit in which semiconductor components and the like are arranged. The case 3 is a second case portion that is fitted to the first case portion 3A and the first case portion 3A on which the circuit board 2 is arranged by the mating surfaces 301 of each other, and accommodates the circuit board 2 together with the first case portion 3A. It has 3B and.

The fastening member 4 is fastened to the fastening surface 341 formed at the side portion 33 of the first case portion 3A at right angles to the mating surface 301 by a plurality of screws 44. The first case portion 3A is provided with a plurality of protruding portions 35 that protrude from the mating surface 301 of the first case portion 3A toward the second case portion 3B and form a part of the fastening surface 341. In other words, a part of the fastening surface 341 is formed on the protruding portion 35. A part of the fastening member 4 is fastened to a portion of the fastening surface 341 formed on the protruding portion 35.

The electronic device 1 of this embodiment will be described in detail below.
(Alignment direction H, etc.)
As shown in FIGS. 1 to 4, in the electronic device 1, the direction in which the first case portion 3A and the second case portion 3B meet (oppose) is referred to as a matching direction H. Further, in the alignment direction H, the side of the bottom portion 31 of the first case portion 3A is referred to as the bottom side H1, and the side of the opening portion 32 of the first case portion 3A is referred to as the opening side H2. Further, the direction in which the fastening member 4 is fastened to the first case portion 3A and which is orthogonal to the mating direction H is referred to as the fastening direction B. Further, the direction orthogonal to both the alignment direction H and the fastening direction B is referred to as the width direction W.

(Electronic device 1)
The electronic device 1 of the present embodiment constitutes an in-vehicle electronic device mounted on a vehicle and used. Further, the electronic device 1 constitutes a power conversion device that converts electric power by the electronic circuit of the circuit board 2. The power conversion device may be a converter that converts the DC voltage of the battery mounted on the vehicle into the DC voltage used for the battery mounted on the vehicle, low power equipment, and the like. Further, the power conversion device may be an inverter that converts the DC voltage of the battery mounted on the vehicle into an AC voltage for driving an AC motor, an AC motor generator, or the like.

The electronic device 1 may be a DC-DC converter as a power conversion device mounted on the lower part of the rear seat of the vehicle. Further, the electronic device 1 may be a DC-DC converter mounted below the center console arranged between the driver's seat and the passenger seat of the vehicle. Further, the electronic device 1 may be a DC-DC converter mounted in the lower part of the trunk room.

Since the in-vehicle electronic device is arranged in a limited space in the vehicle, the end surface 311 of the bottom side H1 in the alignment direction H of the first case portion 3A and the end surface 312 of the opening H2 in the alignment direction H of the second case portion 3B It is better that there are as few irregularities as possible such as protrusions. In the electronic device 1 of the present embodiment, the fastening member 4 is arranged within the range of the maximum dimension h1 in the alignment direction H of the case 3 of the first case portion 3A and the second case portion 3B. The fastening member 4 does not project outward from the end surface 311 of the bottom side H1 and the end surface 312 of the opening side H2 in the mating direction H of the case 3.

(Circuit board 2)
Although detailed illustration is omitted, the circuit board 2 is composed of a substrate portion and various electronic components provided on the substrate portion. A power conversion circuit as an electronic circuit is formed on the circuit board 2 by electronic components. Electronic components include switching elements such as IGBTs (insulated gate bipolar transistors) and MOS-FETs (MOS type field effect transistors).

(Case 3)
As shown in FIGS. 1 to 4, the first case portion 3A and the second case portion 3B constituting the case 3 are made of an aluminum material such as aluminum or an aluminum alloy. The case 3 is used to house and protect the circuit board 2 and the like inside. The mating surface 301 of the first case portion 3A and the mating surface 301 of the second case portion 3B face each other with the sealing material (sealing material) 30 sandwiched between them. The sealing material 30 is in close contact with the mating surface 301 of the first case portion 3A and the mating surface 301 of the second case portion 3B to seal these mating surfaces 301. As the sealing material 30, for example, a paste-like material such as a liquid gasket (FIPG) is used. The sealing material 30 may be a gasket made of rubber, resin or the like.

The mating surface 301 of the first case portion 3A is on the opening side of the surface 332 of the opening side H2 of the first case portion 3A in the mating direction H of the side portion 33 and the fastening side portion 34 on which the protruding portion 35 is formed. It is formed so as to project to H2. The mating surface 301 of the first case portion 3A is formed by cutting to make it a flat surface. The mating surface 301 of the first case portion 3A may be formed as a flat surface without cutting.

The first case portion 3A and the second case portion 3B are fastened by a plurality of bolts 362 with the sealing material 30 sandwiched between them. The plurality of bolts 362 are inserted into the insertion holes 361 formed in the second case portion 3B in a state parallel to the alignment direction H, and are tightened into the screw holes 331 provided in the first case portion 3A. The plurality of bolts 362 are arranged so as to penetrate the mating surfaces 301 of the first case portion 3A and the second case portion 3B.

In FIG. 2, in addition to showing the cross section of the portion of the fastening member 4 where the screw 44 is arranged, the cross section of the portion where the bolt 362 is arranged is also shown via the breaking line. A recess 36 is formed at a portion of the end surface 312 of the opening side H2 of the second case portion 3B in the alignment direction H where the head of the bolt 362 is arranged. Since the head of the bolt 362 is opposed to the recess 36, the head of the bolt 362 is housed inside the alignment direction H (bottom side H1) with respect to the end surface 312. In FIG. 3, the bolt 362 and the recess 36 are shown by an alternate long and short dash line.

The first case portion 3A is formed as a container in which a recess in which the circuit board 2 and the like are arranged is formed. The first case portion 3A has a bottom portion 31 in which the plate surfaces of the circuit board 2 are arranged so as to face each other, and a side portion 33 that stands up from the bottom portion 31 at the outer edge of the bottom portion 31. An opening 32 closed by the second case 3B is formed on the opposite side of the bottom 31 of the first case 3A.

The mating surface 301 of the first case portion 3A is formed in a ring shape along the side portion 33 of the first case portion 3A. In other words, the mating surface 301 of the first case portion 3A is formed in an annular shape on the opening side H2 of the side portion 33 in the mating direction H, which is the peripheral edge of the opening 32 of the first case portion 3A. The mating surface 301 of the second case portion 3B is formed at a position facing the mating surface 301 of the first case portion 3A.

The first case portion 3A and the second case portion 3B are formed in a rectangular shape when viewed from the alignment direction H. One of the four side portions 33 constituting the first case portion 3A is provided with a fastening surface 341, a protruding portion 35, and a fastening side portion 34 in which a screw hole 342 is formed. The fastening side portion 34 is formed as a portion for fastening the fastening member 4. The portion of the opening side H2 in the mating direction H of the fastening surface 341 is formed on the protruding portion 35.

The state in which the fastening surface 341 is orthogonal to the mating surface 301 includes not only a case where the fastening surface 341 is completely orthogonal to the mating surface 301 but also a case where the fastening surface 341 is orthogonal to the mating surface 301, for example, with an inclination angle of 5 ° or less. A cooling fin for cooling the electronic device 1 may be provided on the end surface 311 of the bottom side H1 of the first case portion 3A in the alignment direction H.

The second case portion 3B is formed as a lid member (cover) that covers the first case portion 3A as a container. The second case portion 3B is formed in a flat plate shape, and the thickness in the alignment direction H is reduced at the position of the recess 36 in which the head of the bolt 362 is arranged.

(Protruding part 35)
As shown in FIGS. 1 to 4, the protruding portion 35 is formed on the mating surface 301 of the first case portion 3A so that the portion where the screw 44 is tightened protrudes to the opening side H2 in the mating direction H. is there. The protruding portion 35 projects from the mating surface 301 of the first case portion 3A to the opening side H2 in the mating direction H as a part of the fastening side portion 34. In FIG. 4, the fastening surface 341 of the fastening side portion 34 in a state where the fastening member 4 is removed is shown, and the fastening member 4 is shown by a two-dot chain line.

In the protrusion 35 of the present embodiment, in the flange portion 41 of the fastening member 4, the portion of the fastening side portion 34 where the two screws 44 arranged on the opening side H2 in the alignment direction H are arranged is on the opening side in the alignment direction H. It is formed by bulging in a mountain shape in H2. The protruding portions 35 of this embodiment are formed at two locations in the width direction W of the fastening side portion 34. As shown in FIG. 5, the protruding portion 35 may be collectively formed at one location in the width direction W as a portion of the fastening side portion 34 in which the two screws 44 are arranged.

The protruding portion 35 is formed with a part of a screw hole 342 into which a screw 44 inserted into the insertion hole 411 of the flange portion 41 of the fastening member 4 is tightened. A plurality of screw holes 342 are formed in the fastening side portion 34 in accordance with the plurality of screws 44 inserted into the plurality of (four in this embodiment) insertion holes 411 of the flange portion 41. Each of the two screw holes 342 located on the opening side H2 in the alignment direction H is arranged in the two protruding portions 35.

The protrusion 35 may be arranged with more than half a circumference of the screw hole 342 in the radial direction, or the entire screw hole 342 may be arranged. As shown in FIG. 2, the screw hole 342 of this embodiment is formed from the fastening surface 341 of the fastening side portion 34 to an intermediate position in the fastening direction B of the fastening side portion 34. As shown in FIG. 6, the plurality of screw holes 342 may be formed so as to penetrate from the fastening surface 341 to the side surface 343 of the fastening side portion 34.

(Fastening member 4)
As shown in FIGS. 1 to 3, the fastening member 4 of the present embodiment constitutes a connector that relays the wiring connected to the circuit board 2. The connector has a housing 40 made of an insulating resin and a conductor pin 43 made of a conductive metal provided in the housing 40. The housing 40 of the fastening member 4 has a flange portion 41 to be fastened to the fastening surface 341 of the fastening side portion 34, and a tubular portion 42 in which the conductor pin 43 is arranged inside. The flange portion 41 is formed with a plurality of insertion holes 411 protruding around the end portion of the tubular portion 42 into which the screws 44 are inserted.

The tubular portion 42 is formed in a shape that fits with the mating connector, and the conductor pin 43 is conducted to the conductor portion of the mating connector. The flange portion 41 is formed in a plate shape. The flange portion 41 of this embodiment is formed in the shape of a quadrangular plate, and has insertion holes 411 at each of the four corner portions.

As shown in FIG. 2, a cylindrical collar 410 having an insertion hole 411 is provided in a portion of the flange portion 41 through which the screw 44 is inserted. The collar 410 is a portion where the head of the screw 44 is tightened, and is made of metal in order to increase the rigidity.

The fastening member 4 of this embodiment may be a connector provided in the output unit of the power conversion device as the electronic device 1. Further, the fastening member 4 may be a connector provided in the input portion of the power conversion device as the electronic device 1. Further, the fastening member 4 may be applied to both a connector provided in the input unit and a connector provided in the output unit of the power conversion device as the electronic device 1. Further, as shown in FIG. 1, another fastening member 4 is attached to another side portion 33 such as the side portion 33 located on the side opposite to the side where the fastening side portion 34 is provided in the first case portion 3A. Another fastening side portion to which is fastened may be formed.

(Arrangement relationship)
In the first case portion 3A of the present embodiment, when the dimension of the fitting direction H of the fastening member 4 is larger than the dimension of the mating direction H of the side portion 33 of the first case portion 3A, the entire electronic device 1 is aligned. It has a shape that is effective for reducing the dimension in the direction H. Specifically, as shown in FIG. 2, the fastening side portion 34 for fastening the fastening member 4 of the first case portion 3A is formed so as to be offset to the opening side H2 in the alignment direction H, and the fastening side portion is formed. The protruding portion 35 of the 34 is arranged at a position facing the fastening direction B with respect to the second case portion 3B.

As shown in FIG. 2, the maximum dimension h3 of the fastening side portion 34 of the first case portion 3A of the present embodiment in the mating direction H is the maximum of the mating direction H of the portion of the first case portion 3A excluding the fastening side portion 34. It is larger than the dimension h2. This dimensional relationship is referred to as the first dimensional relationship for convenience. The dimension of the mating direction H of the fastening side portion 34 is set according to the dimension of the mating direction H of the fastening member 4. The end surface 344 of the bottom side H1 in the alignment direction H of the fastening side portion 34 (the end surface located on the opposite side of the protrusion 35) and the end surface 413 of the bottom side H1 in the alignment direction H of the flange portion 41 (opposite side of the protrusion 35). The end face located at) is located inside the matching direction H (opening side H2) with respect to the end face 311 of the bottom side H1 of the portion of the first case portion 3A excluding the fastening side portion 34. With this configuration, even when the maximum dimension h3 in the alignment direction H of the fastening side portion 34 is large, the fastening side portion 34 does not protrude from the end surface 311 of the bottom side H1 of the first case portion 3A to the bottom side H1. It is possible to facilitate the installation of the electronic device 1 at the installation location such as.

Further, on the premise that the first dimensional relationship is satisfied, the maximum dimension h3 in the alignment direction H of the fastening side portion 34 and the maximum dimension h4 in the alignment direction H of the flange portion 41 of the fastening member 4 are the first case portion 3A and the maximum dimension h4. It is smaller than the maximum dimension h1 in the alignment direction H in which the second case portion 3B is combined. The maximum dimension h1 refers to the dimension including the sealing material 30.

As shown in FIG. 2, the end surface 345 of the opening side H2 in the alignment direction H of the fastening side portion 34 (the end surface located on the side of the protruding portion 35) and the end surface 414 of the opening side H2 in the alignment direction H of the flange portion 41 ( The end surface located on the side of the protruding portion 35) is located inside the alignment direction H (bottom side H1) of the end surface 312 of the opening side H2 in the alignment direction H of the second case portion 3B. With this configuration, the fastening side portion 34 and the fastening member 4 can be accommodated within the range of the outer shape of the case 3 in the alignment direction H of the electronic device 1. Then, the maximum outer shape of the electronic device 1 in the alignment direction H can be kept small.

Further, as shown in FIGS. 1 and 2, the entire fastening side portion 34 of the first case portion 3A and the entire flange portion 41 of the fastening member 4 are the entire case 3 of the first case portion 3A and the second case portion 3B. Is within the projection range when projected in the fastening direction B. In other words, when viewed from the fastening direction B, the entire outer shape of the fastening side portion 34 and the flange portion 41 in the mating direction H and the width direction W is the outer shape of the case 3 in the mating direction H and the width direction W. On the other hand, they overlap. With this configuration, the maximum outer shape of the electronic device 1 in the alignment direction H and the width direction W can be kept small.

(Action effect)
In the electronic device 1 of this embodiment, when the fastening member 4 is fastened to the fastening surface 341 of the fastening side portion 34 of the first case portion 3A by a screw 44, the fastening position of the fastening member 4 is devised. ..
Specifically, in the electronic device 1 of the present embodiment, on the side portion 33 of the first case portion 3A, from the mating surface 301 of the first case portion 3A and the second case portion 3B to the side of the second case portion 3B. A protruding portion 35 is formed, and a part of the fastening surface 341 is formed on the protruding portion 35. Further, a part of the fastening member 4 is fastened to a part of the fastening surface 341 formed on the protruding portion 35, and is located on the side of the second case portion 3B from the mating surface 301.

With these configurations, it is possible to adjust the fastening position of the fastening member 4 with respect to the first case portion 3A in the alignment direction H, and it is possible to increase the degree of freedom in the method of fastening the fastening member 4 to the first case portion 3. .. Further, in the electronic device 1 of the present embodiment, the entire fastening side portion 34 of the first case portion 3A and the entire flange portion 41 of the fastening member 4 are the entire case 3 of the first case portion 3A and the second case portion 3B. It is within the projection range when projected in the fastening direction B. In other words, the maximum dimension h4 of the flange portion 41 of the fastening member 4 in the mating direction H is larger than the maximum dimension h2 of the mating direction H of the portion of the first case portion 3A excluding the fastening side portion 34, and the flange. The maximum dimension h4 of the alignment direction H of the portion 41 is smaller than the maximum dimension h1 of the alignment direction H of the case 3. Then, the dimension of the alignment direction H of the electronic device 1 is the maximum dimension h1 of the alignment direction H of the case 3. As a result, the dimension of the electronic device 1 in the alignment direction H can be kept small.

Therefore, according to the electronic device 1 of the present embodiment, it is possible to increase the degree of freedom in how to fasten the fastening member 4 to the first case portion 3A for the purpose of miniaturization.

(Comparison form)
FIG. 7 shows an electronic device 9 as a comparative mode in which the arrangement relationship of the fastening side portion 94 and the fastening member 4 with respect to the first case portion 93A is different from that in the case of the first embodiment. Also in this electronic device 9, the maximum dimension h3 of the fastening side portion 94 of the first case portion 93A in the mating direction H is larger than the maximum dimension h2 of the portion of the first case portion 93A excluding the fastening side portion 94 in the mating direction H. Is also big. The structure of the fastening member 4 is the same as that of the first embodiment.

However, the fastening side portion 94 of the first case portion 93A of the electronic device 9 is formed with a protruding portion protruding from the mating surface of the first case portion 93A and the second case portion 93B toward the second case portion 93B. Not. Then, the end portion 941 of the bottom side H1 of the fastening side portion 94 in the mating direction H protrudes from the bottom portion 931 of the first case portion 93A toward the bottom side H1 in the mating direction H. The dimension of the alignment direction H of the electronic device 1 is larger than the maximum dimension of the alignment direction H of the case 3, and the alignment direction of the fastening member 4 is from the end surface 932 of the opening side H2 of the alignment direction H of the second case portion 3B. The dimension h5 up to the end face 413 of the bottom side H1 of H. Therefore, the maximum outer shape of the electronic device 1 in the alignment direction H becomes large. Further, since the end portion of the bottom side H1 of the fastening member 4 protrudes toward the bottom side H1 from the bottom portion 931 of the first case portion 3A, it becomes difficult to install the electronic device 9 at the installation location of a vehicle or the like.

<Embodiment 2>
In this embodiment, as shown in FIG. 8, instead of forming a plurality of screw holes 342 on the fastening side portion 34 of the first case portion 3A, a plurality of through holes 346 through which the screws 44 are inserted are formed. The electronic device 1 in the case is shown. In the fastening member 4 of the present embodiment, a plurality of screws 44 are inserted into the insertion holes 411 of the flange portion 41 and through the through holes 346 of the fastening side portion 34, and the fastening member 4 has a fastening surface 341. It is fastened to the nut 347 arranged on the side surface 343 located on the opposite side and fastened to the first case portion 3A.

The portion of the bottom side H1 of the fastening side portion 34 of the present embodiment in the alignment direction H is formed in a state of being separated from the first case portion 3A. All of the plurality of through holes 346 are formed so as to penetrate from the fastening surface 341 of the fastening side portion 34 to the side surface 343 opposite to the fastening surface 341. Further, two through holes 346 located on the opening side H2 in the alignment direction H are formed in the protruding portion 35 of the fastening side portion 34.

For example, the nut 347 located on the bottom side H1 in the alignment direction H can be arranged inside the first case portion 3A. Further, in the structure in which the fastening member 4 is fastened to the first case portion 3A, the portion where the screw hole 342 is formed in the first embodiment and the portion where the through hole 346 is formed in the second embodiment may be used in combination. it can.

Other configurations, actions, effects, and the like of the electronic device 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

<Embodiment 3>
In this embodiment, as shown in FIG. 9, the electrons are formed when the planar shape of the mating surface 301 of the first case portion 3A and the second case portion 3B is curved while avoiding the forming portion of the protruding portion 35. The device 1 is shown. In the mating surface 301 of the first case portion 3A of the present embodiment, the curved surface portion 303 curved inward in the fastening direction B so as to avoid the protruding portion 35 at the portion located on the side portion 33 on the side where the fastening surface 341 is formed. Is formed.

In other words, in the planar shape of the mating surface 301 of the first case portion 3A, the planar shape of the portion facing the inside of the fastening direction B with respect to the protruding portion 35 bulges inward of the fastening direction B. Further, the recess of the first case portion 3A is formed along the inner shape of the curved surface portion 303. Further, although not shown, the sealing material 30 is arranged along the shape of the mating surface 301 having the curved surface portion 303. The sealing material 30 is formed with a curved portion that follows the shape of the curved surface portion 303.

The curved surface portion 303 of the present embodiment is formed at two positions facing each of the two protruding portions 35 to which the two screws 44 located on the opening side H2 in the alignment direction H are tightened. In the portion of the mating surface 301 located on the side portion 33 on the side where the fastening surface 341 is formed, the portion between the curved surface portions 303 and the portion located outside the two curved surface portions 303 are in the fastening direction B. It is formed at a position overlapping the protruding portion 35.

By having the curved surface portion 303, the mating surface 301 of the first case portion 3A of the present embodiment is formed closer to the flange portion 41 of the fastening member 4 than in the case of the first embodiment. The mating surface 301 of the first case portion 3A is on the opening side of the surface 332 of the opening side H2 of the first case portion 3A in the mating direction H of the side portion 33 and the fastening side portion 34 on which the protruding portion 35 is formed. It protrudes to H2. In other words, the surface 332 located between the protruding portions 35 on the opening side H2 of the first case portion 3A in the mating direction H is formed as a recess recessed from the mating surface 301 to the bottom side H1 (FIG. See surface 332 of 1).

Even if the liquid gasket constituting the sealing material 30 arranged on the mating surface 301 of the first case portion 3A and the second case portion 3B leaks out, the liquid gasket may be used as a recess on the surface 332. Can be stored in. Then, the liquid gasket can be prevented from leaking until it comes into contact with the fastening member 4. Further, since the surface 332 as the recess is formed, the area for cutting the mating surface 301 of the first case portion 3A can be reduced, and the burden of cutting can be reduced.

As shown in FIG. 10, the curved surface portion 303 is provided on the side portion 33 of the mating surface 301 on the side where the fastening surface 341 is formed so as to avoid the entire forming portion of the two protruding portions 35 inside the fastening direction B. It may be formed in one place of the location.

The other configurations, actions, effects, and the like of the electronic device 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

In the first to third embodiments, the case where the first case portion 3A and the second case portion 3B are fastened by a plurality of bolts 362 is shown. Instead of being fastened by a plurality of bolts 362, the first case portion 3A and the second case portion 3B are prevented from coming off, for example, a fastening structure that receives pressing force from a spring member, a fastening structure that uses an adhesive, or the like. It may be fastened by various structures made of.

The present invention is not limited to each embodiment, and further different embodiments can be configured without departing from the gist thereof. The present invention also includes various modifications, modifications within an equal range, and the like. Further, the technical idea of the present invention also includes combinations, forms, etc. of various components assumed from the present invention.

1 Electronic equipment 2 Circuit board 3 Case 3A 1st case part 3B 2nd case part 301 Alignment surface 341 Fastening surface 35 Protruding part 4 Fastening member 44 Screw

Claims (7)

The circuit board (2) on which the electronic circuit is formed and
A second case portion that is fitted to the first case portion (3A) on which the circuit board is arranged and the first case portion by a mating surface (301) with each other to accommodate the circuit board together with the first case portion. Case with (3B) and
A fastening member (4) to be fastened by a plurality of screws (44) is provided on a fastening surface (341) formed on the side portion (33) of the first case portion orthogonal to the mating surface.
The first case portion is provided with one or a plurality of projecting portions (35) that project from the mating surface of the first case portion to the side of the second case portion and form a part of the fastening surface. Ori,
An electronic device (1) in which a part of the fastening member is fastened to a portion of the fastening surface formed on the protruding portion. The fastening member has a tubular portion (42) in which a conductor pin (43) is arranged inside, and an insertion hole (411) in which the screw is inserted so as to project around the end portion of the tubular portion. It has a plurality of formed flange portions (41), and has a plurality of formed flange portions (41).
The protrusion has at least a part of a screw hole (342) into which the screw inserted into the insertion hole is tightened, or at least one of a through hole (346) into which the screw inserted into the insertion hole is inserted. The electronic device according to claim 1, wherein a portion is formed. The side portion of the first case portion is provided with the fastening surface, the protruding portion, and the fastening side portion (34) in which the screw hole or the through hole is formed.
The maximum dimension (h3) of the fastening side portion in the alignment direction (H) at which the first case portion and the second case portion meet is the alignment of the portion of the first case portion excluding the fastening side portion. Larger than the maximum dimension (h2) in the direction,
In addition, the end face (344) of the fastening side portion located on the opposite side of the protruding portion in the mating direction and the end face (413) of the flange portion located on the opposite side of the protruding portion in the mating direction are The electronic device according to claim 2, wherein the first case portion is located inside the alignment direction with respect to an end surface (311) located on the opposite side of the protruding portion of the portion excluding the fastening side portion. The maximum dimension (h3) in the mating direction of the fastening side portion and the maximum dimension (h4) in the mating direction of the flange portion are the maximum dimensions in the mating direction in which the first case portion and the second case portion are combined. Smaller than (h1)
The end surface (345) of the fastening side portion located on the side of the protrusion in the alignment direction and the end surface (414) of the flange portion located on the side of the protrusion in the alignment direction are the second. The electronic device according to claim 3, wherein the case portion is located inside the mating direction with respect to the end surface (312) located on the side of the protruding portion in the mating direction. As for the entire fastening side portion and the flange portion, when the entire first case portion and the second case portion are projected in the fastening direction (B) in which the fastening member is fastened to the first case portion. The electronic device according to claim 3 or 4, which is within the projection range. The mating surface of the first case portion is formed in a ring shape along the side portion (33) of the first case portion.
The fastening direction (B) in which the fastening member is fastened to the first case portion at a portion of the mating surface of the first case portion located on the side portion (33) on the side where the fastening surface is formed. The electronic device according to any one of claims 1 to 5, wherein a curved surface portion (303) that is curved so as to avoid the protruding portion is formed inside the device. The electronic device constitutes a power conversion device that converts electric power by the electronic circuit on the circuit board.
The electronic device according to any one of claims 1 to 6, wherein the fastening member constitutes a connector that relays wiring connected to the circuit board.

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