JPS6010799A - Electronic circuit device - 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 Field of Industrial Application The present invention is applicable to video tape recorders and television receivers.
The present invention relates to electronic circuit devices used in a wide range of electronic devices such as electronic devices.

Conventional configurations and their problems In recent years, the demand for electronic devices to be smaller and to reduce the amount of wattage has been increasing, and along with this, electronic circuit devices (circuit boards equipped with electronic components, etc.) are becoming smaller, denser, and thinner. The implementation technology for this is becoming an important issue.

Conventionally, various measures have been taken to increase the density of electronic circuit devices in many electronic devices, and one of the representative methods is to create functional blocks of circuits. and create a functional block circuit,
Various forms of circuit blocks (integrated circuit components) are constructed by high-density integration using the small circuit elements that make up each component, and these circuit blocks are mounted on a mother printed circuit board to create electronic circuit devices. There is a mounting method for achieving smaller size and higher density. The applicant of the present invention has already filed an invention in Japanese Patent Application No. 74689/1989 as a mounting technology based on the idea of such functional blocks and lock notifications. The invention of Japanese Patent Application No. 56-74689 relates to the structure of a circuit block body formed into a functional block and its attachment to a mother printed circuit board, and relates to an electronic circuit device in which this circuit block body is attached to a mother printed circuit board. 1st
This will be explained using figures.

This electronic circuit device includes a small circuit element 3a of a planar connection type on a flexible wiring board in which a wiring circuit conductor 2 is formed on one side of a flexible insulating substrate 1.

3b are connected by solder 4, and a circuit block body (integrated circuit component) having a structure in which a pair of hard support plates 5 are bonded to a part of the back surface of the flexible wiring board is bent so that the central part of the flexible wiring board can be bent. In this state, the external connection terminal is inserted into a slit hole 7 provided in the mother printed circuit board 6, and connected to a connection terminal 8 made of a copper foil pattern on the mother printed circuit board 6 by solder 9. Therefore, the characteristics of this electronic circuit device are -
3- Since the external connection terminals of the circuit block body are directly connected to the mother printed circuit board 6 without using lead wires,
It is useful for reducing the volume of the entire electronic circuit device, and small circuit elements 3a, 3t) for configuring a block circuit are mounted on one side of the flexible wiring board, and small circuit elements 3a, 3t) are mounted on both sides when attached to the mother printed circuit board 6. The structure in which the elements 3a and 3b are arranged also helps in downsizing the electronic circuit device.

However, in such conventional electronic circuit devices, as is clear from FIG. Because the flexible wiring board is locally bent with a small radius of curvature,
In order to maintain the mechanical strength of the circuit pattern at the folded portion (the bending strength of the copper foil pattern), special considerations may need to be made in the pattern design section and the construction of the circuit block body. 1. Purpose of the Invention - 4 = The present invention solves the above-mentioned conventional drawbacks, and is an electronic device that can reduce the load on mechanical bending of copper foil patterns, and also enables higher density arrangement of circuit elements attached to flexible wiring boards. The purpose is to provide a circuit device.

Structure of the Invention In order to achieve the above object, an electronic circuit device of the present invention includes predetermined wiring circuit conductors formed on both sides of a flexible insulating substrate, and these wiring circuit conductors on both sides being connected to each other via through holes. A circuit block body having a connected flexible wiring board and a plurality of planar connection type circuit elements fixed to both sides of the flexible wiring board and electrically connected to the wiring circuit conductor; A mother print having a slit hole into which both end portions are inserted while being bent into a substantially U-shape from the center portion, and a connecting terminal conductor is formed on at least one surface in the vicinity of the slit hole. The circuit board is configured to include a board, and a solder that electrically and mechanically connects the connection terminal conductor of the mother printed board and the connection terminal constituting a part of the wiring circuit conductor of the circuit block body. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a cross-sectional view of a circuit block body for configuring an electronic circuit device, in which 10 is a flexible insulating substrate;
Na, 11b is a wiring circuit conductor, 12 is a through hole, 138 to 13d are planar connection type small circuit elements, 1
4 is solder, 19 is the wiring circuit conductor 11a, 11
This is an external connection terminal that constitutes a part of b. FIG. 3 is a cross-sectional view of the electronic circuit device, and 15 is a mother printed board;
16 is a slit hole provided in the mother printed board 15, 17 is a connecting terminal conductor formed in the mother printed board 15, and 18 is solder.

To explain the manufacturing procedure of the above-mentioned electronic circuit device, first, a polyimide film is used as the insulating substrate 10 having excellent heat resistance and flexibility, and desired wiring circuit conductors 11a and 11b are coated with 35 μm thick copper foil on both the front and back surfaces of the film.
A wiring circuit is formed by forming holes passing through the wiring circuit conductors 11a and 11b, and filling the walls of the holes with plating or a conductive paste such as silver or copper. Conductor 11a.

A through hole 12 is formed to electrically connect between the wiring circuit conductors 11a on the front and back surfaces of the so-called flexible double-sided wiring board.

As the planar connection type small circuit elements 13a to 13d necessary for configuring the block circuit on the 11b surface, for example, passive elements such as leadless type chip resistors and chip capacitors, mini-molded type transistors, diodes, and IC1LSIs. By mounting active elements such as on a high-density matrix using micro-soldering technology,
A circuit block body as shown in FIG. 1 is constructed. Then, this circuit block body is used as a mounted small circuit element 13
An external connection terminal consisting of a copper foil pattern formed on the outer surface side of both ends of the flexible wiring board by bending the parts a to 13d so that they do not touch each other so that the cross section is approximately U-shaped from the center part. 19 facing each other via the insulating substrate 10, insert it into one elongated slit hole 1G machined in the mother pudding mill substrate 15 made of a large plate (paper-Funi 7-nor substrate or glass epoxy). , an external connection terminal 1 forming a part of the wiring circuit conductor 11a and Ilb of the circuit block body.
9 and a connection terminal conductor 17 made of a copper foil formed on the mother printed circuit board 15 are directly connected by solder 18.

In the electronic circuit device thus obtained, the flexible wiring board is bent into a substantially U-shape, so the bending resistance of the copper foil pattern at the bent portion is relaxed, and disconnection defects can be reduced. Also, when the flexible wiring board is bent into a substantially U-shape, the small circuit elements 13a to 13d forming the circuit block
Since the flexible wiring boards are placed in a 4w4 arrangement, high density electronic circuit devices can be achieved.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, as described in detail, a circuit block body in which planar connection type circuit elements are densely mounted on the front and back surfaces of a flexible double-sided wiring board is bent so that the cross section is approximately U-shaped. In this state, the mother 8-1 was connected through the slit hole of the printed circuit board, so that the following effect can be obtained.

(2) Since the flexible wiring board is bent into a substantially U-shape, the bending resistance of the copper foil pattern at the bent portion is relaxed, and disconnection defects can be reduced.

■ When the flexible wiring board is bent into a U-shape,
Since the circuit elements constituting the circuit block are arranged in four layers with flexible wiring boards in between, it is possible to realize high density electronic circuit devices.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a conventional electronic circuit device, FIG. 2 is a cross-sectional view of a circuit block body used in an electronic circuit device according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a circuit block body used in an electronic circuit device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the main parts of the electronic circuit device. DESCRIPTION OF SYMBOLS 10... Insulating substrate, 11a, 11b... Wiring circuit conductor, 12... Through hole, 13a-13d...
・Small circuit element (circuit element), 15...Mother printed circuit board, 16...Slit hole, 17...Connecting terminal conductor, 18...Solder, 19...External-9- Connection terminal agent Yoshihiro Moriki-10- Figure 1 Figure 2 Figure 3 π 1d 4 ,, tz tb ] q iq

Claims (1)

[Claims] 1. A flexible wiring board in which predetermined wiring circuit conductors are formed on both sides of a flexible insulating substrate, and the wiring circuit conductors on both sides are connected to each other via through holes, and this flexible wiring. A circuit block body having a plurality of planar connection type circuit elements fixed to both sides of a board and electrically connected to the wiring circuit conductor, and the circuit block body being bent into a substantially U-shape from the center thereof. A mother printed circuit board having a slit hole into which both free ends are inserted in a state in which the mother printed circuit board is connected to a mother printed circuit board having a connecting terminal conductor formed on at least one surface near the slit hole; An electronic circuit device comprising: a solder that electrically and mechanically connects a terminal conductor and an external connection terminal forming a part of a wiring circuit conductor of the circuit block body. -1-