JPH0677681A - Electronic circuit device - Google Patents

Abstract

PURPOSE:To obtain an electromagnetic shield structure which can rationalizes the process by connecting the ground side electrode for the capacitor for a filter to a pattern for shielding. CONSTITUTION:The title device is provided with a printed wiring board 14 with an internal region part 12 constituting an electronic circuit part 11 and an external connection part 13 with an external device, cases 15a and 15b for electromagnetically shielding the internal region part 12, a connector 16 which is packaged at the conductor pattern 14a of the external connection part 13, and a capacitor 17 for a filter where a terminal 17a is connected to the conductor patterns 14a and 14b so that it can be inserted into and connected between the connector 16 and the electronic circuit part 11 and which is laid out at the external connection part 13. A pattern 18 for shielding which is connected to the case 15b is provided at a part where the capacitor for the filter is laid out. Then, the ground side electrode of the capacitor 17 for the filter is connected to the pattern 18 for shielding by a solder 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit device.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional electronic circuit device. This device comprises a printed wiring board 4 which constitutes an electronic circuit portion 5, a case 1 which electromagnetically shields the electronic circuit portion 5 of the printed wiring board 4, and a filter capacitor 2 which connects the case 1 and an earth side electrode. A connector 3 connected to an external device; an electric wire 6 connecting the connector 3 to the filter capacitor 2; and an electric wire 6 connecting the filter capacitor 2 to the electronic circuit section 5 of the printed wiring board 4. ing.

[0003]

However, the above-mentioned conventional structure requires a step of connecting the connector and the filter capacitor with an electric wire and a step of connecting the filter capacitor and the electronic circuit portion of the printed wiring board with an electric wire. For,
There is a problem that the work becomes complicated and it is difficult to rationalize.

[0004]

In order to solve the above-mentioned problems, the present invention relates to a printed wiring board having an internal area portion forming an electronic circuit portion and an external connection portion to an external device, and the printed wiring board described above. A case for electromagnetically shielding the internal region, a connector mounted on the external connection part of the printed wiring board, and a filter capacitor inserted and connected between the connector and the electronic circuit part and arranged on the external connection part. And a shield pattern coupled to the case is provided in a portion of the printed wiring board where the filter capacitor is arranged, and the ground side electrode of the filter capacitor is connected to the shield pattern. .

[0005]

With the above structure, an electronic circuit device in which the electronic circuit section is electromagnetically shielded can be easily and inexpensively realized, and the process can be rationalized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an electronic circuit device according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 and 2 show an electronic circuit device according to a first embodiment of the present invention. In FIG. 1, there are shown an internal area portion 12 constituting an electronic circuit portion 11 and an external device. The printed wiring board 14 having the external connection portion 13, the cases 15a and 15b for electromagnetically shielding the inner area portion 12 of the printed wiring board 14, and the conductor pattern 14a of the external connection portion 13 of the printed wiring board 14 are mounted. A connector 16 and a filter capacitor 17 connected to the conductor patterns 14a and 14b so as to be inserted and connected between the connector 16 and the electronic circuit portion 11 and arranged in the external connection portion 13 are provided. Have. A shield pattern 18 coupled to the case 15b is provided in a portion of the printed wiring board 14 where the filter capacitor 17 is arranged. Then, the ground electrode of the filter capacitor 17 is connected to the shield pattern 18 by solder 19.
A window 20 is provided in a portion of the case 15a corresponding to the connector 16, and the connector 1 is provided through the window 20.
6 is exposed to the outside.

As described above, according to the present embodiment, the inner area portion 12 having the electronic circuit portion 11 has the electromagnetic shield boundary line 21.
Therefore, it is electromagnetically shielded so as not to be affected by an interfering signal from the outside.

Further, according to this embodiment, since the filter capacitor 17 and the connector 16 can be mounted on the printed wiring board 14, it is possible to carry out simultaneous soldering at the same time as other components of the electronic circuit portion, which results in a large number of steps. Streamlining becomes possible.

In this embodiment, the connector has three terminals, but it goes without saying that any number of terminals can be realized.

(Embodiment 2) FIG. 3 shows a second embodiment of the present invention. In this embodiment, a surface mount type connector 16 is used as the connector 16 and a filter capacitor 17 is provided in the conductor pattern 14a. It is configured to connect.

With this structure, the case structure can be further simplified. (Embodiment 3) FIG. 4 shows a third embodiment of the present invention. In this embodiment, a ground electrode of a filter capacitor 17 is connected to a case 15b, and the case 15b is connected to a printed wiring board. 14 is connected to the shield pattern 18.

With this configuration, the soldering process of the printed wiring board 14 can be performed once.

[0014]

As described above, according to the present invention, since the filter capacitor and the connector can be mounted on the printed wiring board, it is possible to perform simultaneous soldering at the same time as the other components of the electronic circuit section. It is possible to realize an electronic circuit device having an electromagnetic shield structure that can be significantly rationalized.

Further, by using the surface mount type connector, the case structure can be further simplified.

[Brief description of drawings]

FIG. 1 is a sectional view of an electronic circuit device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the electronic circuit device according to the embodiment.

FIG. 3 is a sectional view of an electronic circuit device according to a second embodiment of the present invention.

FIG. 4 is a sectional view of an electronic circuit device according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a conventional electronic circuit device.

[Explanation of symbols]

 11 Electronic Circuit Section 12 Internal Area Section 13 External Connection Section 14 Printed Wiring Board 15a, 15b Case 16 Connector 17 Filter Capacitor 18 Shield Pattern

Claims (1)

[Claims] 1. A printed wiring board having an internal area portion forming an electronic circuit portion and an external connection portion with an external device, a case for electromagnetically shielding the internal area portion of the printed wiring board, and a printed wiring board of the printed wiring board. A filter mounted on the external connection portion and a filter capacitor inserted and connected between the connector and the electronic circuit portion and arranged at the external connection portion are provided, and the filter capacitor of the printed wiring board is arranged. An electronic circuit device in which a shield pattern to be coupled to the case is provided in a portion to be connected, and the ground side electrode of the filter capacitor is connected to the shield pattern.