JPH0680919B2 - Structure of electronic components - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of an electronic component such as a metal pack type hybrid integrated circuit device in which an arbitrary circuit is housed in a shield case and terminals are pulled out from the shield case. .

[Prior Art] Generally, in an electronic circuit that generates a large amount of high frequency noise such as a switching regulator, a metal pack type hybrid integrated circuit device that forms an independent circuit by accommodating the electronic circuit as a unit and housing it in a shield case The electronic component configured as is put to practical use. In such an electronic component, a strong shielding effect is obtained from the structure that is sealed by the shield case, and it does not adversely affect other adjacent electronic circuits and electronic devices.

[Problems to be Solved by the Invention]

By the way, in the case of being sealed by a shield case, it is necessary to install a terminal in order to achieve an electrical connection with an external circuit. The lead terminal is provided so as to protrude from the shield case. Such lead-out of the lead terminal is performed by a terminal hole provided in the shield case, and the terminal hole is formed to be considerably large in order to ensure sufficient electrical insulation from the lead terminal.

When mounting such an electronic component on the motherboard of another circuit device, soldering is performed after inserting the lead terminals into the motherboard. For this soldering, usually, an automatic soldering device is used to transfer the molten solder to the solder and apply the back surface of the motherboard. For this reason, there is a disadvantage that the flux in the solder passes through the mounting hole of the motherboard and enters the shield case through the terminal hole of the shield case.

Then, this invention aims at provision of the structure of the electronic component which prevented the invasion of the flux into the inside of a shield case.

[Means for Solving the Problems]

In the structure of the electronic component of the present invention, as illustrated in FIGS. 1 to 3, an arbitrary circuit is mounted and a plurality of lead terminals for connecting the circuit and an external circuit are mounted on the component mounting surface. Case in which a wiring board erected on the side and a board supporting portion for supporting a soldering surface of the wiring board are formed by molding a side wall surface, and a locking projection and a locking projection are formed at an opening edge portion. A main body and a plurality of terminal holes corresponding to the lead terminals protruding from the wiring board, which cover the opening of the case main body to form a shield case, pores through which the locking projections penetrate, The lid terminal is housed in a shield case formed with a locking hole into which the locking projection is inserted, and the lid case and the case body, and the lead terminal is pulled out from a through hole corresponding to the terminal hole. , The inner surface side of the shield case and the A first insulating sheet installed between the shield board and the wiring board to close the terminal hole and electrically insulate the shield case from the wiring board and the lead terminal; and an outer surface of the shield case. The shield case and the mounted member are electrically insulated from each other, and a second insulating sheet provided with an opening having a major axis that collectively penetrates the plurality of lead terminals is provided.

[Action]

According to this structure, the terminal holes of the shield case are closed by the first insulating sheet installed between the inner surface of the shield case and the wiring board, and as a result, the flux contained in the solder is blocked by the insulating sheet. The wiring board and circuit inside the shield case are protected from flux intrusion. Further, since the second insulating sheet is installed on the outer surface side of the shield case, that is, the mounted surface side, electrical insulation between the wiring pattern on the actual member side and the shield case is achieved.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

1 to 3 show an embodiment of the structure of the electronic component of the present invention.

The shield case 2 is installed as a shielding means for accommodating an electronic circuit having an arbitrary function for mechanical protection and electromagnetically shielding other external circuits. The shield case 2 has a circuit unit. As a housing portion for housing 4, a case body 2A having a rectangular parallelepiped shape and a lid portion 2B having a flat rectangular parallelepiped shape for closing the opening are provided. The case body 2A and the lid portion 2B are formed of a conductive metal plate such as an iron plate, for example.

On each side wall of the case body 2A, a protrusion 6 for locking the lid 2B is formed in the vicinity of the opening, and at the edge of the opening, a fixing means to a ground terminal or a wiring board as a mother board (not shown) or the like. A pair of locking projections 8 are formed by extending the side walls. In addition, at the corner portion on the bottom side of the case body 2A, the circuit unit 4 to be housed in the case body 2A is provided.
A plurality of board supporting portions 12 that support the wiring board 10 are formed. Each of the substrate supporting portions 12 is formed by projecting a part of the case body 2A from the outside to the inside.

Further, the lid 2B has an oval-shaped locking hole 14 formed on the side wall thereof so as to engage with the projection 6 of the case body 2A, and the locking projection 8 of the case body 2A is penetrated at the ceiling corner thereof. Pores 16 are formed, and a plurality of terminal holes 20 for drawing out a plurality of lead terminals 18 protruding from the wiring board 10 are formed on the ceiling surface thereof. A second insulating sheet 22 is attached to the outer surface of the lid portion 2B as an insulating means for electrically insulating the mounted member to be mounted, that is, the wiring conductor and the element on the wiring board side to be mounted. This insulation sheet 22 has
An opening 24 including a plurality of terminal holes 20 is formed, and a rectangular notch 28 corresponding to the pore 16 is formed.

The circuit unit 4 housed in the shield case 2 has, for example, a switching regulator as an arbitrary circuit, and in this embodiment, the wiring board 30 is installed together with the wiring board 10. A plurality of elements 32 and 34, which are separated according to size and function, are mounted on 30, and the wiring board 30 is arranged in a direction orthogonal to the wiring board 10.

The shield case 2 is provided with an insulating sheet 36 and a first insulating sheet 38 for electrically insulating the circuit unit 4. The insulating sheet 36 surrounds the bottom surface side and the side surface side of the circuit unit 4, and is installed on the case body 2A side in order to insulate the case body 2A and the circuit unit 4 from each other. In addition, the insulating sheet 38 is the shield case 2
The lead terminal 18 is provided in the through hole 40 which is provided to insulate the lid portion 2B from the circuit unit 4 and is formed corresponding to the lead terminal 18.

With the above configuration, the insulating sheet 36 is installed inside the case body 2A, and the insulating sheet 38 is installed on the lid portion 2B side, so that the shield case 2 and the circuit unit 4 are electrically insulated. Since the insulating sheet 38 is installed on the ceiling side of the circuit unit 4, the terminal hole 20 of the lid 2B is closed by the insulating sheet 38.

In addition, the case body 2A and the lid portion 2B are formed by aligning the engagement hole 14 of the lid portion 2B with the projection 6 of the case body 2A.
The lid 2B and the lid 2B are elastically bonded together.

As shown in FIG. 3, a wiring board 42 as a mother board to be mounted is provided with mounting holes 44 and mounting holes 46 corresponding to the lead terminals 18, and around the mounting holes 44 and mounting holes 46. A wiring pattern 48 is selectively formed on the. The lead terminal 18 is inserted into the mounting hole 44 of the wiring board 42.
When the locking projection 8 is inserted into the mounting hole 46 while inserting, the circuit unit 4 as an electronic component mounted on the shield case 2 is mounted on the wiring board 42.

In this case, since the insulating sheet 22 is attached to the outer surface of the lid portion 2B of the shield case 2, it is electrically insulated from the wiring pattern 50 formed on the surface of the wiring board 42.

Since the terminal hole 20 of the lid portion 2B of the shield case 2 is closed by the insulating sheet 38 housed therein, when the rear side of the wiring board 42 is immersed in the solder during automatic soldering. In addition, the flux contained in the solder is prevented from entering the shield case 2 through the terminal holes 20.

[Effects of the Invention] As described above, according to the present invention, the wiring board is supported inside the case body by the board supporting portion, and the lead terminals of the wiring board are connected through the terminal holes on the lid portion side that close the case body. Drawer, the case body and the lid can be engaged with the locking projection and the pore, the locking projection and the locking hole, and the locking projection can be fixed to a mounted member such as a motherboard. Since the terminal hole formed in the shield case is closed by the first insulating sheet installed therein, the flux can be prevented from entering due to soldering,
It is possible to prevent the chemical or thermal influence of the flux on the wiring board and the circuit housed in the shield case, and improve the reliability of the mounted circuit,
Further, the second insulating sheet installed on the outer surface side of the shield case can electrically insulate the wiring pattern and the like of the mounted member from the shield case, thereby providing a highly reliable electronic component. .

[Brief description of drawings]

1 is a perspective view showing an embodiment of the structure of the electronic component of the present invention, FIG. 2 is an exploded perspective view showing the structure of the electronic component shown in FIG. 1, and FIG. 3 is shown in FIG. It is a longitudinal cross-sectional view showing a mounting mode of an electronic component on a wiring board. 2 ... Shield case 2A ... Case body 2B ... Lid 4 ... Circuit unit 6 ... Projection 8 ... Locking projection 10 ... Wiring board 12 ... Board support 14 ... Locking hole 16 ...... Pore 18 ...... Lead terminal 20 ...... Terminal hole 22 ...... Second insulating sheet 24 ...... Aperture 38 ...... First insulating sheet 40 ...... Through hole

Claims (1)

[Claims] 1. A wiring board on which an arbitrary circuit is mounted and a plurality of lead terminals for connecting the circuit and an external circuit are erected on a component mounting surface side, and a soldering surface of the wiring board. A substrate supporting portion for supporting the case is formed by molding the side wall surface, and a case main body in which the locking projection and the locking projection are formed at the opening edge, and a shield case is formed by covering the opening of the case main body. And a lid having a plurality of terminal holes corresponding to the lead terminals protruding from the wiring board, pores through which the locking projections penetrate, and locking holes into which the locking projections are inserted. And a lead case is housed in a shield case composed of the lid part and the case body, the lead terminal is pulled out from a through hole corresponding to the terminal hole, and is installed between the inner surface side of the shield case and the wiring board. When the terminal hole is closed by A first insulating sheet that electrically insulates the shield case from the wiring board and the lead terminals; and electrically insulates the shield case and the mounted member from the outer surface of the shield case. And a second insulating sheet provided with an opening having a long diameter that allows the plurality of lead terminals to pass through at once, and a structure of the electronic component.