JPH0750618B2 - Resin-sealed printed wiring board - Google Patents

Abstract

PURPOSE:To secure insulation distance between terminals so as to reduce the size of a printed wiring board by providing a cylindrical cover member consisting of insulating matter and with a bottom through which a terminal for external connection is inserted for covering the circumference of the terminal for external connection with a distance from it. CONSTITUTION:In a printed wiring board 1 is soldered a terminal 3 for external connection for electrically connecting an external power source with the board 1 at a solder 1a. The terminal 3 is covered with a cover member 7 of a cylindri cal from consisting of insulating matter covering the circumference of the termi nal 3 and having a bottom 9 through which the terminal 3 penetrates. The board 1 is contained in a case after members 7 are put to cover the terminals 3, and it is sealed by insulating resin 5. A relay terminal 6 with insulating cover is inserted into the terminal 3. If the pitch between the terminals 3 is small, therefore, insulation distance and surface distance can be sufficiently secured, and the terminal 6 can be inserted from the side of the resin 5 down, thereby a printed wiring board can be made more compact.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board in which electric parts are mounted, housed in a case, and sealed with an insulating resin.

[Conventional technology]

As shown in FIG. 5, a printed wiring board on which electric components are mounted generally has a printed wiring board 1 on which wiring has already been basically mounted, the electric components 2 are attached to complete wiring, and a case 4 is provided to protect the wiring. Store and use. However, the electric parts used in the electric circuit are generally miniaturized and have high performance, and along with this, the distance between the bare charging parts of the external connection terminals 3 such as terminals and lead wires is also reduced. However, there is a problem that the insulation distance of the bare charging part for each part is insufficient. Therefore, in order to increase the reliability, the printed wiring board 1 to which the electric component 2 is attached is housed in the case 4 as shown in FIG. 6 and then the insulating resin 5 in a flowing state is poured.
The resin 5 is solidified to insulate the electric parts.
In this way, it is highly resistant to moisture, and damage due to device vibration can be prevented.

[Problems to be solved by the invention]

Even in the printed wiring board thus sealed with the insulating resin, the external connection terminals, for example, the terminals for connecting the printed wiring board and the external power supply, cannot be sealed with the resin, and the external connection terminals are not provided. Since the terminal projects from the insulating resin, the insulation distance of the bare charging part of the external connection terminal is insufficient. In order to compensate for this, the insulation distance of the bare charging part of the external connection terminals becomes insufficient due to the tendency to reduce the pitch between the external connection terminals due to the downsizing and higher functionality of equipment that mounts the printed wiring board. If a commercially available connector is used, there is a drawback that miniaturization is limited and cost is increased. Also, since the relay terminal for external power supply is inserted into the external connection terminal protruding from the insulating resin, in order to strengthen the mechanical coupling with the relay terminal, the length of the external connection terminal protruding from the insulating resin Must be more than a predetermined size,
For this reason, there is a drawback in that downsizing of a device on which the printed wiring board is mounted is impaired.

Therefore, an object of the present invention is to eliminate the drawbacks of the conventional device, to make it possible to reduce the pitch between the external connection terminals, to secure the insulation distance between the external connection terminals, and to connect the relay terminals. It is therefore an object of the present invention to provide a resin-sealed printed wiring board that does not require the external connection terminals to protrude longer than the insulating resin for sealing.

[Means for solving problems]

According to the present invention, according to the present invention, in a printed wiring board in which electric parts are mounted, housed in a case, and sealed with an insulating resin, two external connection terminals having different polarities of the printed wiring board, This is achieved by providing a cylindrical cover member that is made of an insulating material and that surrounds each of the external connection terminals that penetrate the bottomed bottom portion with a space.

[Action]

According to the printed wiring board of the present invention, since the external connection terminals of the printed wiring board sealed with the insulating resin are covered with the cover member, respectively, even if the pitch between the external connection terminals is reduced, The insulation distance is secured securely, and since the insulating resin does not get into the periphery of the external connection terminal due to the cover member, the relay terminal to be inserted into the external connection terminal can be inserted to a position below the insulating resin surface, A strong mechanical connection between the external connection terminal and the relay terminal can be obtained without projecting the connection terminal longer than the insulating resin.

〔Example〕

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, in which the same parts as those in the conventional example shown in FIG. 5 are designated by the same reference numerals.

In FIG. 1, a printed wiring board 1 is shown again by 1, and the printed wiring board 1 is sealed with an insulating resin 5. An external connection terminal 3 for electrically coupling an external power source and the printed wiring board is soldered to the printed wiring board 1 with solder 1a. The external connection terminal 3 is covered with a cylindrical cover member 7 made of an insulating material and covering the periphery of the external connection terminal 3 and penetrating the bottom 9 of the external connection terminal 3. This printed wiring board 1 has terminals 3 for external connection.
After covering with a cover member 7, it is housed in a case (not shown) and sealed with an insulating resin 5. Reference numeral 6 is a relay terminal with an insulating cover that is inserted into the external connection terminal 3. Thus, by covering the external connection terminals 3 with the cover member 7, it is possible to sufficiently secure the insulation distance and the creepage distance even when the pitch between the external connection terminals 3 is made small, and the cover member 7 Since the encapsulating resin 5 does not enter, the relay terminal 6 can be inserted below the surface of the encapsulating resin 5. When the relay terminal 6 not having an insulator cover is used, the height of the cover member 7 can be increased to ensure a prescribed insulation distance.

FIG. 2 shows another embodiment of the present invention. In this embodiment, the cover member 7 is formed in a trumpet shape to facilitate the insertion of the relay terminal 6.

3 and 4 show different embodiments of the present invention, and in these embodiments, the cover member 7 is configured to be prevented from coming off. In the embodiment shown in FIG. 3, the cover member 7 is shown. The cover member 7 is prevented from coming off by providing a retaining seat 7b on the front side. In the embodiment shown in FIG. 4, adjacent cover members 7 are provided with fitting portions 7c which are fitted to each other. The cover member 7 is prevented from coming off by connecting the fitting portions 7c to each other.

〔The invention's effect〕

As described above, according to the present invention, in a printed wiring board housed in a case to which an electric component is attached and sealed with an insulating resin, two external connection terminals having different polarities of the pudding wiring board are provided. In addition, by providing a cylindrical cover member that is made of an insulating material and covers the periphery of each external connection terminal that penetrates the bottomed bottom portion with a gap, it is possible to reduce the pitch between the external connection terminals. Can secure a sufficient insulation distance between the external connection terminals and the cover member has a bottom so that the insulating resin does not enter into the cover member. Can be inserted below the surface of the insulative resin, and therefore, there is an advantage that a device mounted with the printed wiring board can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a printed wiring board showing an embodiment of the present invention, FIGS. 2 to 4 show different embodiments of the present invention, and FIG. 2 and FIG. Partial sectional view, FIG. 4 (a) is a main part sectional view, FIG. 4 (b) is a plan view seen from the upper surface of FIG. 4 (a), and FIG. 5 and FIG. 6 are exploded views showing a conventional device, respectively. It is a perspective view and a sectional view. 1: Printed wiring board, 3: External connection terminal, 5: Insulating resin, 7: Cover member.

Claims (4)

[Claims] 1. A printed wiring board in which electric parts are mounted, housed in a case, and sealed with an insulating resin. Two external connection terminals of different polarities of the printed wiring board are made of an insulating material, respectively. A resin-sealed printed wiring board, characterized in that a cylindrical cover member is provided to cover the periphery of each of the external connection terminals that penetrates the bottomed bottom portion with a gap. 2. The resin-sealed printed wiring board according to claim 1, wherein the cover member is formed in a shape that is divergent from the printed wiring board side. 3. The resin-sealed printed wiring board according to claim 1, wherein the cover member has a connecting portion which is connected to an adjacent cover member. 4. The resin-sealed printed wiring board according to claim 1, wherein the cover member has a retaining seat at a portion sealed with an insulating resin. substrate.