JPH10173349A - Case for wiring board and electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing cost of molding die by extrusion molding the die including a case body, having two opposite open end faces with rail parts for clamping a wiring board projecting from the inner surface of the opposite side walls of the case body. SOLUTION: A case body 10 is extrusion molded with each corner part being curved and rail parts 11 for clamping a wiring board comprising two rail-like protrusions are projected from the inner surface of opposite, side walls thereof. A wiring board is inserted into the rail parts 11 for clamping a wiring board and secured in place. Opposite open faces of the case body 10 are covered with a panel 15 fixed to panel fixing holes 13 through screw holes 16 by means of screws. A length between two open faces of the case body 10 can be set freely, and different kinds of case body 10 can be formed using one molding die, depending on the number, length, and the like of wiring boards to be contained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring board storage case and an electronic device, and more particularly, to a wiring board storage case for storing a wiring board on which electronic components are mounted, and the wiring board storage case. The present invention relates to an electronic device in which the wiring board and the like are stored in a case.

[0002]

2. Description of the Related Art In recent years, in many electronic devices, electronic components such as capacitors, resistors, and semiconductor element mounting components are mounted, and a printed wiring board having a predetermined function is assembled as one unit. In such cases, cases in which one or a plurality of wiring boards are incorporated are installed in several places inside the vehicle, and electronic devices (ECUs) configured with the wiring boards housed in the cases are provided. Various controls are performed.

A case for housing the wiring board has conductivity so that the housed wiring board is not subjected to electrostatic or electromagnetic interference from other circuits and the like arranged around the wiring board. A metal case is used, and the metal case is usually formed by, for example, press molding, die casting, impact molding, or the like.

FIG. 5A is a partially cutaway perspective view schematically showing a conventional wiring board storage case (case body) and a wiring board described in Japanese Utility Model Laid-Open No. 4-18478. (B) is a sectional view taken along line BB in (a).

A rectangular parallelepiped case body 50 having an opening on the right front side has wiring board sandwiching rails 51 formed of two rail-like projections projecting from the inner surfaces of the opposing side walls in parallel with the bottom surface. I have. Then, by inserting the wiring board 52 having the conductor layer 52a formed in the vicinity of the side portion into the wiring board holding rail portion 51,
The wiring board 52 is fixed, and the wiring board 52 is fixed.
The connection between the conductor layer 52a and the case body 50 is achieved, and the circuit formed on the wiring board 52 is grounded.

Accordingly, the wiring board 52 on which electronic components are mounted is housed in the case body 50, and a panel (not shown) serving as a lid is fixed to the open end face.
Electronic devices can be relatively easily assembled.

[0007]

The case body 50
Is usually formed by die casting or impact molding using aluminum or the like. Die-casting is a method that uses a precision mold and automatically or manually pours it into this mold and applies pressure to cast it. Etc. means a method of forging by applying pressure from the mold to the block.

However, in these molding methods, a mold is used, so that only one case body (case for storing a wiring board) 50 having one dimension can be manufactured by one mold. There is a problem that a mold is required and the cost for manufacturing the mold is high.

In the conventional case for storing a wiring board,
A bracket or the like is required to attach the wiring board storage case to another member, and there is a problem that it takes time to attach the case.

Further, since the thickness of the conductor layer 52a formed on the wiring board 52 is usually small,
It has been difficult to precisely set the distance between the two rail-shaped protrusions constituting the wiring board sandwiching rail portion 51 so that the 2a reliably contacts the case body 50 side. In addition, the thickness may be slightly different depending on the type of the wiring board 52,
In this case, there is a problem that it is difficult to satisfactorily perform grounding.

The present invention has been made in view of the above-mentioned problems, and it is possible to manufacture various lengths by using one mold, so that the manufacturing cost can be reduced.
It is an object of the present invention to provide a wiring board housing case in which a screw groove for attaching a panel (lid) and a groove for attaching to a different member are also formed.

According to the present invention, there is provided an electronic apparatus having a connection structure between a wiring board and a wiring board holding portion, wherein the circuit on the wiring board housed in the wiring board housing case can be easily and reliably grounded. It is intended to provide.

[0013]

In order to achieve the above object, a case (1) for accommodating a wiring board according to the present invention comprises a case body formed by extrusion and having two opposing end faces opened. It is characterized in that a wiring board holding rail portion is formed so as to protrude from the inner surface of the opposite side wall of the case body.

According to the wiring board housing case (1), since the case body is formed by extrusion molding, one mold is used to manufacture case bodies (wiring board housing cases) having different lengths. It is possible to adjust the length of the wiring board storage case according to the number and length of the wiring boards to be stored. Therefore, by manufacturing different types of case bodies with one mold, the manufacturing cost can be reduced, and an inexpensive wiring board housing case can be provided. Further, the wiring board can be fixed by inserting the wiring board into the wiring board holding rail portion, and the circuit on the wiring board can be grounded.

The case (2) for storing a wiring board according to the present invention is the same as the case (1) for storing a wiring board,
A panel fixing hole having a circular shape in a sectional view is formed at a corner of the case body.

According to the wiring board storage case (2), since the case main body is formed by the extrusion molding method, the panel fixing hole, particularly a part thereof is cut out to form a groove shape. The panel (lid) can be easily fixed with screws or rivets by using the panel fixing holes.

The case (3) for storing a wiring board according to the present invention is the same as the case (2) for storing a wiring board,
A part of the panel fixing hole is cut out so as to open outward.

According to the wiring board storage case (3), since a part of the panel fixing hole is cut out so as to open outward, when the panel is fixed, the metal generated by the fixing work is removed. Debris can be prevented from falling into the wiring board storage case.

The wiring board housing case (4) according to the present invention is the same as any one of the wiring board housing cases (1) to (3), except that it has an outwardly open fitting for fixing to another member. A groove is formed in the case body.

According to the wiring board storage case (4), a rail having a shape to be fitted into the fitting groove is formed on another member, for example, the vehicle body side, and the rail is fitted into the fitting groove. This makes it possible to easily fix the wiring board storage case to another member. Also, usually
Brackets, bolts, and the like required when fixing the wiring board storage case are not required.

In the electronic device according to the present invention, a land or a penetrating portion may be provided at a portion of the wiring board housed in any of the wiring board housing cases (1) to (4), which comes into contact with the wiring board holding rail. A hole is formed, a solder layer is formed on the land or inside and around the through hole, and a circuit on the wiring board is grounded via the solder layer and the rail portion for holding the wiring board. Features.

According to the electronic device, since the solder layer is formed on a portion of the wiring board which comes into contact with the wiring board holding rail, the wiring board is inserted into the wiring board holding rail. If the wiring board is press-fitted, the connection between the wiring board holding rail portion and the solder layer can be reliably performed, and the arrangement of the ground terminal and the screw of the ground terminal as in the conventional case can be performed. Stopping work becomes unnecessary.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a wiring board storage case and electronic equipment according to the present invention will be described below with reference to the drawings. FIG. 1A is a perspective view schematically showing a case body constituting the wiring board storage case according to the embodiment (1), and FIG. 1B is used as a lid of the wiring board storage case. FIG. 2 is a front view schematically showing a panel to be used.

As shown in FIG. 1A, the case body 1
In No. 0, each corner is formed by a curved surface so that extrusion molding is easy, and the front side and the back side are open for extrusion molding. Further, a wiring board holding rail portion 11 composed of two rail-shaped projections is formed so as to protrude from the inner surface of the opposite side wall of the case body 10, and a part of which forms a panel fixing hole 13 at each corner. Is formed so as to open inward.

The facing opening surfaces of the case body 10 are
The lid is made by the panel 15 shown in FIG.
In that case, the panel fixing hole 13 can be used and fixed by screws or rivets through the screw holes 16 of the panel 15. In addition, when using rivets, the use of blind rivets facilitates the panel 15.
Can be fixed to the case main body 10, but if a blind rivet is used, the panel 15 is completely fixed to the case main body 10. Therefore, it is preferable that at least one surface is screwed so that the panel 15 can be removed.

The case main body 10 is formed by extrusion molding using a mold. A cylindrical body corresponding to several cases of the case main body 10 is formed, and the cylindrical body is cut to form a case. Since the main body 10 can be manufactured, a distance (length) between two opening surfaces of the case main body 10 is provided.
Can be set freely. That is, different types of case bodies 10 can be manufactured by using one mold according to the number and length of the wiring boards to be stored, so that the manufacturing cost of the wiring board storage case can be reduced as a result. it can. Further, by inserting the wiring board into the wiring board holding rail portion 11, the wiring board can be fixed, and the circuit on the wiring board can be grounded.

In the above embodiment (1), the panel fixing hole 13 is cut out so as to partially open to the inside, but the panel fixing hole is circular in cross section and a part thereof is open. It does not have to be notched so that

FIG. 2 is a perspective view schematically showing a case body constituting the case for storing a wiring board according to the embodiment (2).

The case main body 20 has the same configuration as the case main body 10 shown in FIG. 1 except that a fitting groove 21 which is opened outward is formed at the center of the upper surface. The fitting groove portion 21 is formed to be fixed to another member (vehicle body side) constituting a vehicle or the like, and is fitted to a member at a place where the wiring board storage case including the case body 20 is arranged. By forming a rail having a shape that fits with the fitting groove 21 and fitting the fitting groove 21 to the rail, the wiring board housing case can be easily fixed to the vehicle body. Therefore, brackets, bolts, and the like, which are usually required when fixing the wiring board storage case, are not required. If the rail for fitting in the fitting groove 21 is slightly tapered, the fitting can be performed more smoothly, and the wiring board storage case can be firmly fixed.

FIG. 3 is a perspective view schematically showing a case body constituting the case for storing a wiring board according to the embodiment (3).

The case main body 30 is configured in the same manner as the case main body 20 shown in FIG. 2, except that a groove 32 which is open outward at a corner is formed. Since the panel fixing holes 33 are formed by the groove portions 32, the panel 15 (FIG. 1) can be fixed by screws or rivets using the panel fixing holes 33.

Further, since the panel fixing holes 33 are opened outward, when fixing the panel 15 with screws or the like, metal dust generated by the fixing work is placed inside the case body (wiring board storage case) 30. Falling can be prevented.

FIG. 4A is a sectional view schematically showing an electronic device according to the embodiment (4), and FIG. 4B is a partially enlarged plan view showing a wiring board constituting the electronic device. is there.

A wiring board 18 on which electronic components (not shown) are mounted is housed in a wiring board housing case 40 including the case body 10 and the panel 15.
8 in contact with the wiring board holding rail 11
A land 19 or a through hole (not shown) is formed, and a solder layer 19a is formed on the land 19 or inside and around the through hole, and wiring is performed via the solder layer 19a and the wiring board holding rail portion 11. The circuit on the substrate 18 is grounded.

The connection with the wiring board holding rail portion 11 via the solder layer 19a formed on the land 19 and the like as described above is based on the following reason. That is, a land 19 is formed in a portion of the wiring board 18 that comes into contact with the wiring board holding rail section 11, and the land 19 can be brought into contact with the wiring board holding rail section 11 to achieve grounding. Since the thickness of the land 19 is small, it is difficult to appropriately set the distance between the two rail-shaped protrusions that constitute the wiring board holding rail portion 11 so that the land 19 is securely contacted. Further, the thickness may be slightly different depending on the type of the wiring board 18, and in this case, it is difficult to establish a good grounding state.

Therefore, a solder layer 19a is formed on the land 19, and the total thickness of the conductor layer is increased. in this case,
Since the thickness of the solder layer 19a can be adjusted to some extent, the adjustment width of the thickness of the entire conductor layer becomes large. Further, since the solder layer 19a itself is soft, the thickness of the portion where the solder layer 19a is formed is set to be slightly thicker than the interval between the rail-shaped protrusions, and the wiring board 18 is connected to the wiring board clamping rail portion 1.
When the wiring board 18 is press-fitted into the wiring board 1, the connection between the wiring board holding rail portion 11 and the solder layer 19a can be reliably performed. This eliminates the necessity of arranging the grounding terminal and screwing the grounding terminal as in the conventional case.

The solder layer 19a can be formed by immersing the wiring board 18 in a solder bath, and the thickness of the solder layer 19a can be controlled to some extent by adjusting the temperature of the solder bath.

[Brief description of the drawings]

FIG. 1A is a perspective view schematically showing a case body constituting a case for storing a wiring board according to Embodiment (1) of the present invention, and FIG. 1B is a perspective view showing the case for storing the wiring board. It is the front view which showed typically the panel used as a lid of a case.

FIG. 2 is a perspective view schematically showing a case main body constituting a case for storing a wiring board according to Embodiment (2).

FIG. 3 is a perspective view schematically showing a case body constituting a case for storing a wiring board according to Embodiment (3).

FIG. 4A is a cross-sectional view schematically illustrating an electronic device according to Embodiment (4), and FIG. 4B is a partially enlarged plan view illustrating a wiring board included in the electronic device. .

FIG. 5A is a partially cutaway perspective view schematically showing a conventional wiring board storage case (case main body) and a wiring board, and FIG. 5B is a BB line in FIG. It is sectional drawing.

[Explanation of symbols]

 10, 20, 30 Case body 11 Wiring board holding rail 13, 33 Panel fixing hole 15 Panel 18 Wiring board 19 Land 19a Solder layer 21 Fitting groove 40 Wiring board storage case

Claims (5)

[Claims] 1. A semiconductor device comprising: a case body formed by extrusion molding and having two opposing end surfaces opened; and a wiring board sandwiching rail portion protruding from an inner surface of a side wall of the case body opposite to the case body. Characteristic wiring board storage case. 2. A panel fixing hole having a circular shape in a sectional view at a corner of a case body.
The printed circuit board storage case described. 3. The panel fixing hole according to claim 2, wherein a part of the panel fixing hole is cut out so as to open outward.
The printed circuit board storage case described. 4. The wiring board storage device according to claim 1, wherein an externally-fitting groove for fixing to another member is formed in the case body. Case. 5. A land or through hole is formed in a portion of the wiring board housed in the wiring board housing case according to claim 1 which is in contact with the wiring board holding rail. An electronic device, wherein a solder layer is formed on a land or inside and in a through hole and a circuit on the wiring board is grounded via the solder layer and the rail for holding the wiring board.