JP2986620B2 - Electronic circuit device - Google Patents

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. The apparatus includes a printed wiring board 4 constituting an electronic circuit section 5, a case 1 for electromagnetically shielding the electronic circuit section 5 of the printed wiring board 4, and a filter capacitor 2 connecting the case 1 and a ground electrode. A connector 3 for connecting to an external device; an electric wire 6 for connecting the connector 3 to the filter capacitor 2; and an electric wire 6 for 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 electric wires and a step of connecting the filter capacitor and the electronic circuit portion of the printed wiring board with electric wires. For,
There was a problem that the work became complicated and rationalization was difficult.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a printed wiring board having an internal area constituting an electronic circuit section and an external connection to an external device, and A case that electromagnetically shields the internal area, 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 disposed 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 electrode of the filter capacitor is connected to the shield pattern. .

[0005]

According to the above construction, 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 EMBODIMENTS 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. A printed wiring board 14 having an external connection portion 13, cases 15 a and 15 b for electromagnetically shielding the internal region 12 of the printed wiring board 14, and a conductor pattern 14 a of the external connection portion 13 of the printed wiring board 14. The terminal 16a is connected to the conductor patterns 14a and 14b so as to be inserted and connected between the connector 16 and the electronic circuit section 11, and the filter capacitor 17 disposed in the external connection section 13 is connected. 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 disposed. 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 15 a corresponding to the connector 16, and the connector 1 is inserted through the window 20.
6 is exposed to the outside.

As described above, according to the present embodiment, the internal region 12 having the electronic circuit portion 11 is separated from the electromagnetic shield boundary line 21.
Therefore, electromagnetic shielding is performed so as not to be affected by an external interference signal.

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 batch soldering simultaneously with other components of the electronic circuit portion, and the number of steps is greatly increased. Streamlining becomes possible.

Although the connector has three terminals in this embodiment, it is needless to say that any number of terminals of the connector can be realized.

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

With this configuration, the structure of the case 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. It is configured to be connected to fourteen shielding patterns 18.

With this configuration, the process of soldering 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 are configured to be mounted on the printed wiring board, the components can be collectively soldered simultaneously with other components of the electronic circuit portion. It is possible to realize an electronic circuit device having an electromagnetic shield structure capable of greatly simplifying the above.

By using a surface mount type connector, the structure of the case can be further simplified.

[Brief description of the 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]

 DESCRIPTION OF SYMBOLS 11 Electronic circuit part 12 Internal area part 13 External connection part 14 Printed wiring board 15a, 15b Case 16 Connector 17 Filter capacitor 18 Shielding pattern

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H05K 9/00

Claims (1)

(57) [Claims] A printed circuit board having an internal region constituting an electronic circuit portion and an external connection portion to an external device; a case for electromagnetically shielding the internal region of the printed circuit board; A connector mounted on the external connection portion, and a filter capacitor inserted and connected between the connector and the electronic circuit portion and disposed on the external connection portion, wherein the filter capacitor of the printed wiring board is disposed. An electronic circuit device, wherein a shielding pattern coupled to the case is provided at a portion of the electronic component, and a ground electrode of the filter capacitor is connected to the shielding pattern.