JP7235455B2 - Electronic equipment and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electronic device having a casing having a vent and a manufacturing method thereof.

In an electronic device having a casing with a vent that protects against foreign solids, the vent is generally constructed as a separate member from the casing. For example, Japanese Unexamined Patent Application Publication No. 2002-100002 discloses an electronic device having a ventilation member that fits into an opening provided in a housing via a seal ring.

JP 2015-205420 A

If the ventilation section is made of a member separate from the casing, the number of parts increases, which poses problems in terms of manufacturing cost and management cost. In addition, since the ventilation member and the casing must be configured to be compatible with each other, there is a problem that the degree of freedom in design is reduced and the position and size of the ventilation portion cannot be designed freely.

SUMMARY OF THE INVENTION In view of the circumstances as described above, an object of the present invention is to provide an electronic device capable of improving the degree of freedom in designing a ventilation section while reducing the number of parts.

To achieve the above object, an electronic device according to one aspect of the present invention includes a synthetic resin casing and an electronic component.
The casing has a first case half and a second case half. The first case half has a first bottom wall portion including a ventilation portion and a first welding surface provided with welding ribs for ultrasonic welding . The second case half has a second bottom wall portion facing the first bottom wall portion, and a second welding surface joined to the first welding surface via the welding rib .
The electronic component is arranged inside the casing.
The ventilation part includes at least one ventilation hole penetrating the first bottom wall part, a first annular recess provided on the outer surface of the first bottom wall part and surrounding the ventilation hole, and a second circular recess provided on the inner surface and positioned at the center of the first annular recess and having an outer diameter smaller than the inner diameter of the first annular recess; and the first annular recess provided on the inner surface of the first bottom wall portion. a third circular recess having an outer diameter greater than the inner diameter of the first annular recess and less than the outer diameter of the first annular recess .

In the electronic device described above, since the ventilation section is formed integrally with the first bottom wall section, the position and size of the ventilation section can be arbitrarily set without adding parts. Furthermore, even when the ultrasonic welding method is used to join the first welding surface and the second welding surface, the vibration propagating to the ventilation hole is attenuated by the first annular concave portion of the ventilation portion, thereby preventing ultrasonic vibration from occurring. Damage to the vent can be avoided. Further, the second circular concave portion has a function of damping ultrasonic vibrations propagating along the inner surface of the first bottom wall portion toward the ventilation hole.

The ventilation part may further have a second annular recess provided on the inner surface of the first bottom wall part and surrounding the ventilation hole. In this case, the second annular recess has an inner diameter larger than the opening diameter of the air hole and an outer diameter smaller than the inner diameter of the first annular recess.

The ventilation portion may further include a first circular recess provided on the outer surface of the first bottom wall portion and positioned at the center of the first annular recess. In this case, the vent hole is provided in the center of the first circular recess, and the first circular recess has an outer diameter smaller than the inner diameter of the second annular recess.

The vent may include a plurality of holes provided in the bottom of the second circular recess.

The ventilation part may further include a ventilation hole arranged along the circumference of the second circular recess and a notch exposing the ventilation hole to the outside.

The vent may further comprise a filter material disposed in the third circular recess.

The first bottom wall portion may further have a frame-shaped contact surface configured to be in contact with the ultrasonic welding horn. In this case, the ventilation part is provided at a position offset from the center of the area surrounded by the contact surface.

The second case half may further have a peripheral surface portion having the second welding surface and an opening through which a portion of the electronic component penetrates.

The pore size of the vent is typically less than 1 mm.

A method of manufacturing an electronic device according to one aspect of the present invention includes housing the electronic component between the first half case and the second half case,
An ultrasonic welding horn is brought into contact with the outer surface of the first bottom wall portion to ultrasonically bond the first welding surface to the second welding surface.

As described above, according to the present invention, it is possible to improve the degree of freedom in designing the ventilation section while reducing the number of parts.

1 is an exploded perspective view schematically showing the configuration of an electronic device according to one embodiment of the present invention; FIG. It is a side view of the said electronic device. FIG. 4 is a plan view of the ventilation part seen from the inside of the first half case of the electronic device; It is a bottom view of the said ventilation part. 4 is an enlarged cross-sectional view taken along the line AA in FIG. 3; FIG. It is a schematic diagram explaining the welding process of the casing in the said electronic device. FIG. 8 is a configuration diagram of a ventilation section in an electronic device according to a second embodiment of the present invention, where (A) is a plan view of the ventilation section as seen from the inside of the first case half, and (B) is a view of the opposite side. A bottom view (C) is an enlarged cross-sectional view taken along the line BB in (A). FIG. 8 is a configuration diagram of a vent in an electronic device according to a third embodiment of the present invention, where (A) is a plan view of the vent viewed from the inside of the first case half, and A bottom view (C) is an enlarged cross-sectional view taken along the line BB in (A).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First embodiment>
FIG. 1 is an exploded perspective view schematically showing the configuration of an electronic device 100 according to one embodiment of the invention.
In the figure, the X-axis, Y-axis, and Z-axis indicate three mutually orthogonal directions: the X-axis is the front-rear direction (vertical direction), the Y-axis is the left-right direction (horizontal direction), and the Z-axis is the vertical direction (thickness direction). or height direction). In the following description, the arrow direction of the X-axis is also referred to as forward (the opposite side is backward), and the arrow direction of the Z-axis is also referred to as upward (the opposite side is downward).

An electronic device 100 of this embodiment includes a casing 1 and electronic components 3 housed in the casing 1 .

[casing]
The casing 1 is formed in a substantially rectangular parallelepiped shape elongated in the X-axis direction, and has an internal space S capable of accommodating the electronic component 3 . The casing 1 has a first case half 10 and a second case half 20, which are joined by ultrasonic welding.

Both the first case half 10 and the second case half 20 are made of injection molded synthetic resin material. The type of synthetic resin material is not particularly limited, and it is composed of an appropriate material that can be ultrasonically welded, and in this embodiment, PBT (polybutylene terephthalate) is used. The synthetic resin material may contain reinforcing fibers such as glass fibers, and the content thereof is, for example, about 30 wt %.

The first case half 10 has a first bottom wall portion 11 , a rear wall portion 12 and a pair of first side wall portions 13 . The rear wall portion 12 and the pair of side wall portions 13 constitute the peripheral surface portion of the first case half 10 .

The first bottom wall portion 11 is formed in a flat plate shape parallel to the XY plane and constitutes the bottom wall of the casing 1 . The rear wall portion 12 has a flat plate shape that is parallel to the YZ plane and erected on the first bottom wall portion 11 , and constitutes the rear wall of the casing 1 . The pair of first side wall portions 13 has a flat plate shape extending vertically from the first bottom wall portion 11 and parallel to the XZ plane, and constitutes part of the side wall of the casing 1 . The first side wall portion 13 has a shape in which the height along the Z-axis direction continuously increases toward the rear wall portion 12, and typically has a right-angled triangular shape when viewed from the Y-axis direction. formed into a shape. A plurality of reinforcing ribs 19 are provided on the inner surfaces of each of the rear wall portion 12 and the pair of first side wall portions 13 . The number and positions of the reinforcing ribs 19 are not particularly limited and can be set arbitrarily.

The second case half 20 has a second bottom wall portion 21 , a front wall portion 22 and a pair of second side wall portions 23 . The front wall portion 22 and the pair of second side wall portions 23 constitute the peripheral surface portion of the second case half 20 .

The second bottom wall portion 21 faces the first bottom wall portion 11 in the Z-axis direction and constitutes the upper wall of the casing 1 . The front wall portion 22 has a flat plate shape that is erected on the second bottom wall portion 21 and parallel to the XY plane, and constitutes a front wall of the casing 1 facing the rear wall portion 12 in the X-axis direction. An opening 27 through which a connector 32 (external connecting portion) of the electronic component 3 penetrates is provided in a substantially central portion of the front wall portion 22 .

The pair of second side wall portions 23 has a flat plate shape extending vertically from the second bottom wall portion 21 and parallel to the XZ plane, and constitutes part of the side wall of the casing 1 . The pair of second side wall portions 23 has a shape in which the height along the Z-axis direction continuously increases toward the front wall portion 22, and typically has a shape when viewed from the Y-axis direction. It is formed in the shape of a right triangle. A plurality of reinforcing ribs 29 are provided on the inner surfaces of each of the front wall portion 22 and the pair of second side wall portions 23 . The number and positions of the reinforcing ribs 29 are not particularly limited and can be set arbitrarily.

In the present embodiment, the second bottom wall portion 21 has a stepped shape in which two plane portions parallel to the XY plane and having different heights on the front side and the rear side are connected in the X-axis direction via a stepped portion. . The shape of the second bottom wall portion 21 is not limited to this, and may be formed in a flat plate shape similar to the first bottom wall portion 11, or may be formed in a dome shape, a cone shape, or a more complicated three-dimensional shape. may be

Note that the first bottom wall portion 11 is formed in a rectangular shape having an overall length larger than that of the second bottom wall portion 21 . At the four corners or near the corners of the first bottom wall portion 21, there are a plurality of mounting holes 17 (see FIG. 2) through which bolts or screws are inserted for fixing the electronic device 100 to an object to be mounted (not shown). is provided. Further, the first bottom wall portion 11 is provided with a ventilation portion 400 that communicates the internal space S with the outside air. The details of the ventilation part 400 will be described later.

The first case half 10 further has a frame-shaped first welding surface 14 . The first welding surface 14 is provided across the first bottom wall portion 11 , the rear wall portion 12 and the pair of first side wall portions 13 . More specifically, the first welding surfaces 14 are formed at the upper end of the rear wall portion 12, the upper end of the pair of first side walls 13, and the front end of the pair of first side walls 13. It is formed in a rectangular annular shape so as to be continuous with the inner surface of the first bottom wall portion 11 located therebetween.

A part of the first welding surface 14 provided on the first bottom wall portion 11 is formed on the inner surface of the first bottom wall portion 11 so as to connect the front side end portions of the pair of first side wall portions 13 . It is provided on the upper surface of the linear protrusion 15 parallel to the direction. The ridge 15 may be formed with a significant height so as to form part of the front wall of the casing 1 .

The first welding surface 14 is configured by a plane that is inclined with respect to the first bottom wall portion 11 . More specifically, the first welding surface 14 is a frame-shaped inclined surface formed along a diagonal line that slopes downward from the rear side to the front side of both side walls of the casing 1 or along a straight line that approximates the diagonal line. Configure. This inclined plane is typically a plane parallel to the XY plane inclined at a predetermined angle around the Y axis.

Similarly, the second case body 20 further has a frame-shaped second welding surface 24 . The second welding surface 24 is provided across the second bottom wall portion 21 , the front wall portion 22 and the pair of second side wall portions 23 . More specifically, the second welding surfaces 24 are formed on the lower end of the front wall portion 22, the lower end of the pair of second side walls 23, and the rear end of the pair of second side walls 23. It is formed in a rectangular annular shape so as to be continuous with the inner surface of the second bottom wall portion 21 located therebetween.

A part of the second welding surface 24 provided on the second bottom wall portion 21 is formed on the inner surface of the second bottom wall portion 21 so as to connect the rear side end portions of the pair of second side wall portions 23 to the Y axis. It is provided on the lower surface of the linear protrusion 25 (or the rear side wall portion) parallel to the direction. The ridge 25 may be formed with a significant height so as to form part of the rear wall of the casing 1 .

The second welding surface 24 is formed on a plane substantially parallel to the first welding surface 14 and has the same shape and size. The second welding surface 14 is joined to the first welding surface 14 via welding ribs 16 provided on the first welding surface 14 .

[Electronic parts]
As shown in FIG. 1, the electronic component 3 passes through a component body 31 arranged between the first half case 10 and the second half case 20 and the front wall portion 22 of the second half case 20. It has a connector 32 as an external connection part to connect.

The component body 31 is composed of a combination of a circuit board 33 and a shield case 34 covering both sides of the circuit board 33 , and is housed in the internal space S of the casing 1 . A plurality of electronic components such as an IC chip are mounted on the circuit board 33, and constitutes a control circuit for various devices. The shield case 34 is for protecting the circuit board 33 from electromagnetic noise, but may be omitted depending on the type and specifications of the electronic component 3 .

FIG. 2 is a side view of the electronic device 100. FIG. An internal space S (see FIG. 1) of the casing 1 is formed to have a size capable of accommodating the component body 31 of the electronic component 3 . The total length of the second case half 20 is formed shorter than the total length of the electronic component 3, and the connector 32 of the electronic component 3 penetrates the front wall portion 22 of the second case half 20 and protrudes to the outside. .

The connector 32 has a plurality of connection pins inside and is typically made up of waterproof connector parts. The connector 32 constitutes a protruding portion that penetrates the front wall portion 22 (opening 27 ) of the second case half 20 and protrudes outside the casing 1 . The connector 32 is mechanically and electrically connected to the front end of the circuit board 33 via the support 35 . The protrusions are not limited to external connection terminals such as the connector 32, but may be fuses, adjustment screws, switches, volume adjusters, and the like.

The support 35 has a seal ring 36 that is in close contact with the inner surface of the front wall portion 22 of the second case half 20 to prevent dust and droplets from entering the internal space S of the casing 1 through the opening 27 . The support 35 is fixed to the front wall portion 22 using a plurality of fasteners such as screws, although not shown.

The electronic component 3 is not particularly limited, and constitutes, for example, a control control unit (ECU) that controls various driving devices, or a communication terminal that detects the operating rate of the construction machine. Connector 32 is an interface connector. The electronic component 3 may be provided with other external connection terminals in addition to the connector 32 . Other external connection terminals are similarly provided on the circuit board 33 so as to protrude from the casing 1 through the front wall portion 22 . Another connection terminal may be, for example, an antenna unit for GPS, Cellular, or the like.

[Vent part]
Next, the details of the ventilation section 400 will be described. 3 is a plan view of the ventilation part 400 seen from the inside of the first case half 10, FIG. 4 is a bottom view of the opposite side, and FIG. 5 is an enlarged cross-sectional view taken along line AA in FIG.

The ventilation part 400 is formed integrally with the first bottom wall part 11 of the first case half 10, and is typically molded integrally with the first bottom wall part 11 by injection molding. In this embodiment, the vent 400 has a single vent 40 . The hole diameter d0 of the ventilation hole 40 is not particularly limited, but is preferably 1.0 mm or less so as to satisfy the dustproof specification IP4 (no foreign matter of φ1.0 mm intrusion).

The ventilation part 400 has an outer annular recess 41 (first annular recess). The outer annular recessed portion 41 is an annular recessed portion provided on the outer surface 11 b of the first bottom wall portion 11 so as to surround the vent hole 40 . The outer annular concave portion 41 has a function of suppressing vibrations directed toward the ventilation hole 40 along the outer surface 11b of the first bottom wall portion 11 during ultrasonic welding. The outer annular recessed portion 41 is formed concentrically with the vent hole 40 with a depth t1 smaller than the thickness t0 of the first bottom wall portion 11 . The size of the depth t1 is not particularly limited, and is set to an appropriate thickness that ensures the strength of the ventilation section 400 and provides a desired function of damping ultrasonic vibration.

The ventilation portion 400 further has an inner annular recess 42 (second annular recess), an outer circular recess 43 (first circular recess), and a filter mounting portion 44 (third circular recess).

The inner annular recessed portion 42 is an annular recessed portion provided on the inner surface 11 a of the first bottom wall portion 11 so as to surround the vent hole 40 . The inner annular concave portion 42 has a function of suppressing vibration toward the air hole 40 along the inner surface 11a of the first bottom wall portion 11 during ultrasonic welding. The inner annular recess 42 is formed concentrically with the vent hole 40 and has an inner diameter d3 larger than the opening diameter d0 of the vent hole 40 and an outer diameter d4 smaller than the inner diameter d1 of the outer annular recess 41. The depth t2 of the inner annular recess 42 is not particularly limited, and is the same as the depth t1 of the outer annular recess 41 in this embodiment. The inner annular recess 42 is formed at the bottom of the filter mounting portion 44 . The inner diameter d3, the outer diameter d4, and the depth t2 are not particularly limited, and are set to appropriate thicknesses that ensure the strength of the ventilation section 400 and obtain the desired ultrasonic vibration damping function.

The outer circular recess 43 is provided on the outer surface 11 b of the first bottom wall portion 11 and positioned at the center of the outer annular recess 41 . A vent hole 40 is provided in the center of an outer circular recess 43 . The outer circular recess 43 has the function of additionally damping ultrasonic vibrations propagating from the outer annular recess 41 towards the vent 40 . The outer circular recess 43 has an outer diameter d5 which is less than the inner diameter d3 of the inner annular recess 42. As shown in FIG. The depth of the outer circular recess 43 is not particularly limited, and is the same as the depth t1 of the outer annular recess 41 in this embodiment.

The filter mounting portion 44 is provided on the inner surface 11a of the first bottom wall portion 11 and is a circular recess having an outer diameter d6 that is larger than the inner diameter d1 of the outer annular recess 41 and smaller than the outer diameter d2 of the outer annular recess. . The depth of the filter mounting portion 44 is not particularly limited, and in the present embodiment, the filter mounting portion 44 is formed with a depth t3 that is smaller than the depth t2 of the inner annular recess 42 .

A filter material F for preventing dust and moisture from entering the internal space S from the outside of the casing 1 through the ventilation hole 40 is arranged on the filter mounting portion 44 . The filter material F constitutes a part of the ventilation part 400 and is joined to the filter mounting part 44 by adhesion or welding. The material and form of the filter material F are not particularly limited, and typically, a sheet material made of air-permeable and water-absorbing fibers, woven fabric, non-woven fabric, or the like is used. Note that the filter material F may be omitted as necessary.

The dimensions of each part of the ventilation part 400 are not particularly limited, and an example is as follows. d0 = 0.8 mm, d1 = 12.3 mm, d2 = 20.4 mm, d3 = 6.3 mm, d4 = 9.3 mm, d5 = 3.3 mm, d6 = 16.4 mm, t0 = 3 mm, t1 = t2 = 1 mm, t3 = 0.5 mm.

[Method for manufacturing electronic device]
Next, a method for manufacturing the electronic device 100 of this embodiment configured as described above will be described.

The method of manufacturing the electronic device 100 includes the steps of accommodating the electronic component 3 between the first half case 10 and the second half case 20, bringing the ultrasonic welding horn into contact with the first bottom wall portion 11, and ultrasonically bonding the first welding surface 14 to the second welding surface 24 .

In this embodiment, the casing 1 is divided into two by a first case half 10 and a second case half 20 along a diagonal line or a straight line approximating this (see FIG. 2). Therefore, in the step of housing the electronic component 3 between the first half case 10 and the second half case 20, the connector 32 of the electronic component 3 is passed through the front wall portion 22 of the second half case 20. Meanwhile, the component body 31 is accommodated inside the second case half 20 . As a result, the internal space of the second case half 20 can be kept to a minimum volume that can accommodate the component body 31 of the electronic component 3, so that the second case half 20 can be made smaller. can. In other words, the second case half 20 does not need to provide a space corresponding to the length L ₀ (see FIG. 2) of the connector 32 of the electronic component 3 protruding from the opening 27 . The total length can be made shorter than the total length of the electronic component 3 .

The electronic component 3 accommodated in the second case half 20 is mounted on the second case half 20 via a plurality of screws inserted through a plurality of mounting brackets (not shown) formed at appropriate positions around the component body 31 . is fixed to the inner surface side of the second bottom wall portion 21 of the .

The second case half 20 to which the electronic component 3 is attached is ultrasonically welded to the first case half 10 . FIG. 6 is a schematic diagram for explaining the welding process.

The second case half 20 is placed on the welding jig 81 with the second welding surface 24 facing upward. The welding jig 81 is configured to horizontally support the second bottom wall portion 21 of the second case half 20 . In this state, the first case half 10 faces the second welding surface 24 with the first welding surface 14 facing downward.

Subsequently, as shown in FIG. 6 , the ultrasonic welding horn 82 is brought into contact with the first bottom wall portion 11 of the first case half 10 to apply ultrasonic waves of a predetermined frequency to the first case half 10 . As a result, the welding rib 16 on the first welding surface 14 melts due to vibration friction with the second welding surface 24, and the welding rib 16 and the second welding surface 24 are welded to each other. Since reinforcing ribs 19 and 29 are provided on the inner surfaces of the peripheral surfaces of the first case half 10 and the second case half 20, respectively, the first welding surface 14 and the second welding surface 24 are opposed to each other during welding. Able to maintain stable relationships. As a result, the first case half 10 can be properly joined to the second case half 20 even when the plate thickness of the peripheral surface portions of the case halves 10 and 20 is relatively small.

The ultrasonic welding horn 82 abuts on a frame-shaped contact surface 11 t provided on the outer surface of the first bottom wall portion 11 . As shown in FIG. 4, the contact surface 11t is formed by a plane parallel to the XY plane, and the position where the first welding surface 14 is projected onto the first bottom wall portion 11 in the Z-axis direction (that is, the first welding surface 14 directly below). Thereby, the pressing force applied from the ultrasonic welding horn 82 to the contact surface 11 t in the Z-axis direction can be appropriately transmitted to the welding rib 16 on the first welding surface 14 .

According to this embodiment, since the ventilation part 400 is integrally formed with the first bottom wall part 11 of the first case half 10, a separate member (foreign object guard, etc.) for forming the ventilation part is required. Therefore, it is possible to reduce the size of the ventilation section 400 . This makes it possible to reduce the number of parts and manufacturing man-hours. Moreover, since the ventilation part 400 can be formed at an arbitrary position and size on the first bottom wall part 11, the degree of freedom in designing the ventilation part 400 can be improved.

In addition, since the ventilation part 400 has the outer annular recess 41, the ultrasonic vibration traveling from the contact surface 11t along the outer surface of the first bottom wall part 11 toward the ventilation hole 40 can be attenuated in the outer annular recess 41. can be done. Similarly, the inner annular recess 42 can attenuate the ultrasonic vibrations traveling from the contact surface 11 t along the inner surface of the first bottom wall portion 11 toward the ventilation hole 40 in the inner annular recess 42 . Furthermore, the outer circular recess 43 allows for additional damping of ultrasonic vibrations propagating from the outer annular recess 41 towards the vent 40 . As a result, it is possible to prevent the vent hole 40 from being damaged by the ultrasonic energy during welding and the bottom wall portion 11 from cracking starting from the vent hole. Furthermore, since the outer annular concave portion 41 serves as a path through which water flows when the first bottom wall portion 11 is installed vertically, it is difficult for water to enter the inside from the vent hole 40 .

The ventilation part 400 can be formed at any position of the first bottom wall part 11 . In this embodiment, the ventilation part 400 is provided at a position offset from the center 11c (see FIG. 4) of the area surrounded by the contact surface 11t (a position shifted by an arbitrary distance from the center 11c in the longitudinal direction of the first bottom wall). be done. Ultrasonic energy applied to the contact surface 11 tends to vibrate the area center 11c of the first bottom wall 11 as the point of maximum amplitude. By arranging the ventilation part 400 at a position offset from the center 11c, the amount of deformation of the ventilation part 400 during welding can be effectively reduced.

Furthermore, according to this embodiment, in the welding process, the second case half 20 containing the electronic component 3 is placed on the welding jig 81, and the ultrasonic welding horn 82 is brought into contact with the first case half 10. Therefore, it is possible to suppress the propagation of ultrasonic vibration energy to the electronic component 3 and prevent the electronic component 3 from being damaged by the vibration amplitude.

<Second embodiment>
7A to 7C are configuration diagrams of a ventilation portion 500 in an electronic device according to a second embodiment of the present invention, and FIG. 500 is a plan view, (B) is a bottom view of the opposite side, and (C) is an enlarged cross-sectional view taken along line BB in (A). Hereinafter, configurations different from those of the first embodiment will be mainly described, and configurations similar to those of the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted or simplified.

In this embodiment, the ventilation section 500 has a plurality of ventilation holes 40, an outer annular recess 41, a filter mounting section 44, and an inner circular recess 45 (second circular recess). In the drawing, illustration of the filter material F (see FIG. 5) is omitted.

The inner circular recess 45 is provided on the inner surface 11 a of the first bottom wall portion 11 and positioned at the center of the outer annular recess 41 . The inner circular concave portion 45 has a function of damping ultrasonic vibrations propagating along the inner surface 11 a of the first bottom wall portion 11 toward the ventilation hole 40 . The inner circular recess 45 has an outer diameter d7 that is less than the inner diameter d1 of the outer annular recess 41. As shown in FIG. The depth t4 of the inner circular recess 45 is not particularly limited, and is the same as the depth t1 of the outer annular recess 41 in this embodiment.

A plurality of vent holes 40 are provided at the bottom of the inner circular recess 45 and have the same opening diameter d0. In this embodiment, the plurality of vent holes 40 are composed of a total of four vent holes 40 provided at equal angular intervals at three locations around the center of the inner circular recess 45 and its periphery. The three vent holes 40 located around form an equilateral triangle with side length p1. The number and formation positions of the vent holes 40 are not limited to this, and they may be provided at appropriate positions of the inner circular concave portion 45 .

The dimensions of each part of the ventilation part 500 are not particularly limited, and examples thereof are as follows. d0 =0.8 mm, d1 =12.3 mm, d2 =20.4 mm, d6 =16.4 mm, d7 =9.3 mm, t0 =3 mm, t1 =t4 =1 mm, t3 =0.5 mm, p1 =4. 0 mm.

Also in the ventilation part 500 of this embodiment configured as described above, it is possible to obtain the same effects as those of the above-described first embodiment. According to this embodiment, since it has a plurality of ventilation holes 40, ventilation can be improved. As a result, it can be suitably used for electronic equipment, for example, for in-vehicle use, which undergoes significant temperature changes.

<Third Embodiment>
8A to 8C are configuration diagrams of the ventilation part 600 in the electronic device according to the third embodiment of the present invention, and FIG. 600 is a plan view, (B) is a bottom view of the opposite side, and (C) is an enlarged cross-sectional view taken along line BB in (A). Hereinafter, configurations different from those of the first embodiment will be mainly described, and configurations similar to those of the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted or simplified.

In this embodiment, the ventilation part 600 has a plurality of ventilation holes 40, an outer annular recess 41, a filter mounting part 44, and an inner circular recess 46 (second circular recess). In the drawing, illustration of the filter material F (see FIG. 5) is omitted.

The inner circular recess 46 is provided on the inner surface 11 a of the first bottom wall portion 11 and positioned at the center of the outer annular recess 41 . The inner circular recess 45 has an outer diameter d7 that is less than the inner diameter d1 of the outer annular recess 41. As shown in FIG. The depth t4 of the inner circular recess 46 is not particularly limited, and is set larger than the depth t1 of the outer annular recess 41 in this embodiment.

A plurality of vent holes 40 are provided at the bottom of the inner circular recess 46 . In this embodiment, the plurality of ventilation holes 40 are composed of a total of five ventilation holes 40 provided at equal angular intervals at four locations spaced apart by a distance p2 around and around the center of the inner circular recess 46 . The opening diameter of each vent hole 40 is not particularly limited, and in the present embodiment, the opening diameter d8 of the four vent holes 40 located on the periphery is set smaller than the opening diameter d0 of the central vent hole 40. there is The number and formation positions of the vent holes 40 are not limited to this, and they may be provided at appropriate positions of the inner circular concave portion 45 .

In the present embodiment, the inner peripheral portion of the outer annular recess 41 has four vent holes 40 arranged along the periphery of the inner circular recess among the plurality of vent holes 40 on the outer surface 11 b of the first bottom wall portion 11 . A plurality of cutouts 47 are provided for exposure to the .

The dimensions of each part of the ventilation part 600 are not particularly limited, and examples thereof are as follows. d0 =0.8 mm, d1 =11.2 mm, d2 =20.4 mm, d6 =16.4 mm, d7 =9.3 mm, d8 =0.7 mm, t0 =3 mm, t1 =1 mm, t4 =1.5 mm, t3 =0.5 mm, p2 =3.4 mm.

Also in the ventilation part 600 of this embodiment configured as described above, it is possible to obtain the same effects as those of the above-described first embodiment. According to this embodiment, since it has a plurality of ventilation holes 40, ventilation can be improved. As a result, it can be suitably used for electronic equipment, for example, for in-vehicle use, which undergoes significant temperature changes. Further, according to this embodiment, since the plurality of ventilation holes 40 provided around the inner circular concave portion 46 are opened through the notch portion 47, dust remaining inside can be discharged.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the above-described embodiments and can be modified in various ways.

For example, in the above embodiments, the vents 400, 500, 600 are provided in the first bottom wall portion 11 of the first case half 10, but the present invention is not limited to this, and the second bottom wall of the second case half 20 It may be provided in the section 21 .

Further, in the above embodiment, the connector 32 of the electronic component 3 is configured to pass through the front wall portion 22 of the second case half 20, but this is not the only option. It may be configured to pass through the portion 12 .

Furthermore, in the above embodiment, an example has been described in which the casing 1 is divided by the first case half 10 and the second case half 20 along the diagonal lines of the side wall portions or straight lines approximate thereto. It is not limited, and may be divided along a plane parallel to the first bottom wall portion 11 .

Reference Signs List 1 casing 3 electronic component 10 first case half 11 first bottom wall 14 first welding surface 16 welding rib 20 second case half 21 second bottom wall 22 front surface 24 ... second welding surface 32 ... connector 40 ... ventilation hole 41 ... outer annular recess (first annular recess)
42... Inner annular recess (second annular recess)
43... Outer circular recess (first circular recess)
44... Filter mounting portion (third circular concave portion)
45, 46... Inner circular recess (second circular recess)
82... Ultrasonic welding horn 100... Electronic device 400, 500, 600... Ventilation part F... Filter material

Claims (10)

a first case half having a first bottom wall portion including a ventilation portion and a first welding surface provided with welding ribs for ultrasonic welding; and a second bottom wall portion facing the first bottom wall portion. a second case half body having a second welding surface joined to the first welding surface via the welding rib; and a casing made of synthetic resin.
an electronic component disposed inside the casing;
The ventilation part includes at least one ventilation hole penetrating the first bottom wall part, a first annular recess provided on the outer surface of the first bottom wall part and surrounding the ventilation hole, and a second circular recess provided on the inner surface and positioned at the center of the first annular recess and having an outer diameter smaller than the inner diameter of the first annular recess; and the first annular recess provided on the inner surface of the first bottom wall portion. and a third circular recess having an outer diameter larger than the inner diameter of the first annular recess and smaller than the outer diameter of the first annular recess . a first case half having a first bottom wall portion including a ventilation portion and a first welding surface provided with welding ribs for ultrasonic welding; and a second bottom wall portion facing the first bottom wall portion. a second case half body having a second welding surface joined to the first welding surface via the welding rib; and a casing made of synthetic resin.
electronic components arranged inside the casing;
and
The ventilation part includes at least one ventilation hole penetrating the first bottom wall part, a first annular recess provided on the outer surface of the first bottom wall part and surrounding the ventilation hole, and a second annular recess provided on the inner surface and surrounding the vent,
The electronic device, wherein the second annular recess has an inner diameter larger than an opening diameter of the air hole and an outer diameter smaller than the inner diameter of the first annular recess. The electronic device according to claim 2,
The ventilation part further has a first circular recess provided on the outer surface of the first bottom wall part and positioned at the center of the first annular recess,
The vent hole is provided at the center of the first circular recess,
The electronic device, wherein the first circular recess has an outer diameter smaller than the inner diameter of the second annular recess. The electronic device according to claim 1 ,
The electronic device, wherein the vent includes a plurality of holes provided in the bottom of the second circular recess. The electronic device according to claim 1 ,
The electronic device, wherein the ventilation part further includes a ventilation hole arranged along the circumference of the second circular recess, and a notch part exposing the ventilation hole to the outside. The electronic device according to claim 1 ,
The electronic device , wherein the ventilation part further includes a filter material arranged in the third circular recess. The electronic device according to any one of claims 1 to 6 ,
The first bottom wall further has a frame-shaped contact surface configured to be able to contact with the ultrasonic welding horn,
The electronic device, wherein the ventilation part is provided at a position offset from the center of the area surrounded by the contact surface. The electronic device according to claim 7 ,
The electronic device, wherein the second case half further includes a peripheral surface portion having the second welding surface and an opening through which a portion of the electronic component penetrates. The electronic device according to any one of claims 1 to 8 ,
The electronic device, wherein the air hole has a hole diameter of less than 1 mm. A method for manufacturing an electronic device according to any one of claims 1 to 9 ,
housing the electronic component between the first half case and the second half case;
A method of manufacturing an electronic device, wherein an ultrasonic welding horn is brought into contact with an outer surface of the first bottom wall portion to ultrasonically bond the first welding surface to the second welding surface.

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