JPS6226775A - Electronic circuit structural body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a compact two-sided electronic circuit structure.

[Prior art and its problems]

A typical electronic circuit is formed by mounting necessary electronic components on a printed circuit board having a predetermined circuit pattern. In order to increase the mounting density of electronic components in such electronic circuits and make the whole circuit compact, it is effective to form circuit patterns on both sides of the printed circuit board and mount electronic components on both sides of the printed circuit board. .

However, mounting electronic components on both sides of a printed circuit board is much more troublesome than mounting electronic components on one side because components are likely to fall off. Also, if parts are mounted on both sides,
Although the overall area is approximately halved, the thickness including the parts is approximately twice that of a single-sided case, and the problem is how to reduce the thickness.

[Means for solving problems and their effects]

The present invention provides a two-sided electronic circuit structure that solves the problems of the prior art as described above. electronic components are mounted on the circuit pattern, and connection electrodes are formed at opposing positions on each of the circuit patterns, and between the connection electrodes, there is conductivity in the thickness direction but conductivity in the width direction. The present invention is characterized in that the upper case and the lower case are connected with a directional connecting piece having no properties sandwiched therebetween.

BACKGROUND OF THE INVENTION Electronic circuits in which electronic components are mounted on printed circuit boards are usually used while being housed in a suitable protective case. Therefore, in the present invention, a protective case is used instead of the circuit board, and a circuit pattern is formed on the inner surfaces of the upper case and the lower case. However, if this is done, the circuit will be separated into the upper case side and the lower case side, so a directional connecting piece is used as a means to easily connect these.

As the directional connection piece, a silicone rubber sheet in which a large number of thin metal wires are embedded in the thickness direction, or a silicone rubber sheet in which conductive rubber layers and insulating rubber layers are alternately laminated in the width direction can be used.

〔Example〕

1 to 5 show one embodiment of the present invention.

In the figure, 11 is an upper case, 12 is a lower case, and circuit patterns 13 and 14 are fixed to the inner surfaces of both cases, respectively. Circuit pattern 1 on the inner surface of case 11-12
Appropriate methods for fixing 3 and 14 include pasting a pre-manufactured flexible printed circuit onto the inner surface of the case, or transferring a circuit pattern formed on a transfer sheet onto the inner surface of the case. Necessary electronic components 15 are mounted on the circuit patterns 13 and 14, respectively. Mounting of the electronic component 15 is easy because it can be done on one side.

The upper and lower circuit patterns 13 and 14 have connection electrodes 16 and 17 formed at opposing positions, respectively, to connect to the other party.
The connection electrodes 16 and 17 are housed in recesses 18 and 19 formed in the upper case 11 and lower case 12, respectively. Further, a directional connecting piece 20 that is conductive in the thickness direction but not in the width direction is fitted into the recesses 18 and 19. For example, as shown in FIG. 5, the directional connecting piece 20 is made of a silicone rubber sheet 21 with a large number of thin metal wires 22 embedded in the thickness direction, and has rubber elasticity.

Therefore, when the upper case 11 and the lower case 12 are tightened and connected with the bolts and nuts 23, the directional connecting piece 20 is sandwiched between the connecting electrodes 16 and 17, compressive strain is applied, and the repulsive force presses the directional connecting piece 20 against the connecting electrodes 16 and 17. and connection electrodes 16 and 17
It will provide continuity between the two. In addition, since the directional connecting piece 20 is fitted into the recesses 18 and 19 and the periphery is restrained,
There is no stress relaxation due to flow, and a stable connection can be maintained over a long period of time.

6 and 7 show other embodiments of the invention. In this embodiment, the upper case 11 has a flat plate shape, and the lower case 1
Only 2 is box-shaped. This embodiment is the same as the above embodiment in that the circuit patterns 13 and 14 are fixed to the upper case If and the lower case 12, but the recess 19 is provided only in the lower case 12. The bottom surface of the recess 19 is a flat surface continuous with the inner bottom surface of the lower case 12, as shown in FIG. Therefore, since the circuit patterns 13 and 14 need only be fixed on a flat surface, the fixing work is easy.

The recess 19 is formed by attaching the partition wall 24 after the circuit pattern 14 is fixed to the lower case 12.

A directional connection piece 20 is fitted into this recess 19, and when the upper case 11 and lower case 12 are combined, it is sandwiched between the connection electrodes 16 and 17, and the circuit patterns 13 and 14 are sandwiched between the connection electrodes 16 and 17.
This is the same as in the above embodiment in that conduction is obtained.

〔Effect of the invention〕

As explained above, according to the present invention, circuit patterns are fixed on the inner surfaces of the upper case and the lower case, and electronic components are mounted thereon, so that electronic components can be mounted on two surfaces. This is effective in making the entire structure more compact. Furthermore, since the circuit pattern is separated into the upper case side and the lower case side, components can be mounted using a single-sided surface mounting method, resulting in extremely good assembly workability. In addition, when connecting the upper case and lower case, the circuit patterns that are separated into two can be connected by simply inserting the directional connecting piece between the connecting wires and tightening them, so a separate process for connecting the circuit patterns is required. This is not necessary, and from this point of view as well, the assembly workability is good. Furthermore, since electronic components are mounted on circuit patterns that face each other, the overall thickness can be made thinner than with double-sided mounting by making the mounting positions of tall components different between both circuit patterns. There is also.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the electronic circuit structure according to the present invention, Fig. 2 is an enlarged sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an upper case of the electronic circuit structure. FIG. 4 is an internal view of the lower case side, FIG. 5 is a cross-sectional view of a directional connecting piece used in the electronic circuit structure, and FIG. 6 is an internal view of the electronic circuit structure according to the present invention. FIG. 7 is a cross-sectional view of a main part showing another embodiment, and FIG. 7 is an inner view of the lower case side. 11~Upper case, 12~Lower case, 13/14~Circuit pattern, 15~Electronic component, 16/17~Connection electrode, 18
- 19 - recess, 20 - directional connection piece, 24 - partition wall. Figure 6 Figure 7

Claims (4)

[Claims] (1) A circuit pattern is fixed to the inner surface of the upper case and a lower case, and electronic components are mounted thereon, and connection electrodes are formed on each of the circuit patterns at opposing positions to the other, and the connection is made. An electronic device characterized in that the upper case and the lower case are combined with a directional connecting piece having conductivity in the thickness direction but not in the width direction being sandwiched between the electrodes. circuit structure. (2) An electronic circuit structure according to claim 1,
At least one of the upper case and the lower case is formed with a recess that accommodates the connection electrode portion of the circuit pattern, and a directional connection piece is fitted into the recess. (3) An electronic circuit structure according to claim 2,
The directional connection piece has rubber elasticity, and compressive strain is applied by tightening the upper and lower cases. (4) An electronic circuit structure according to claim 2,
The bottom of the recess is a flat surface that is continuous with the internal bottom of the case.
The recess is formed by attaching a partition wall to the case from above the circuit pattern fixed to the plane.