JPH0528917B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric circuit wiring board on which electronic components such as IC chips are mounted.

[Conventional technology]

Conventionally, printed wiring boards made of copper laminates have been widely used to construct electronic circuit packages, but in recent years, methods of manufacturing plastic wiring boards using injection molding technology have been developed. The component terminal mounting portion of such a wiring board is usually made by plating through-holes in the same manner as conventional printed wiring boards, or by providing a through-hole made of conductive plastic and a land using the cut end of the through-hole as a seat. They are made by heavy molding, and connections are made by press-fitting component terminals into through-holes (solderless press-fit connection) or by soldering after insertion.

[Problem that the invention seeks to solve]

Normally, when electronic devices are driven at high speed, high density and miniaturization are essential conditions in order to shorten the electrical length. However, when mounting an IC chip on a printed circuit board, the actual situation is that it is mounted via an IC case and an IC socket.
The cases are connected by wire bonding, and the IC
The case and IC socket were connected by pressure welding, and the IC socket and PWB were connected by soldering. Such a mounting structure delays the drive speed of the electronic device and increases the number of work steps, resulting in major problems in terms of performance, quality, and cost.

The purpose of the present invention is to eliminate the above-mentioned problems, reduce the number of installation steps by forming a part of the conductor layer of an electric circuit wiring board into a cantilever shape, and directly connecting chip-shaped component terminals. An object of the present invention is to provide an electric circuit wiring board that allows highly reliable connections.

[Means for solving problems]

The electric circuit wiring board of the present invention includes a substrate made of an insulator, a conductive wiring pattern constituting an electric circuit pattern, and an electronic component that is projected onto the substrate and is mounted continuously from the wiring pattern. and a beam-shaped portion including an electrical connection portion to be connected to the terminal.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Referring to FIGS. 1 and 2, the first embodiment of the present invention
The example is shown with electronic components attached. Components that are the same in FIG. 1 and FIG. 2 are designated by the same reference numerals. A substrate body 1 made of insulating plastic, and a wiring pattern 3 made of conductive plastic, for example, plastic containing metal powder.
and the substrate body 1 connected to this wiring pattern 3.
It has a connecting terminal 2 projecting in a cantilever shape on the surface thereof. The substrate body 1 and the wiring pattern 3 are formed by double molding. A chip-shaped electronic component 10 is mounted on the plurality of connection terminals 2, and a clamp 4 protrudes from the substrate body 1 in a hook shape.
Due to the elasticity of the connecting terminal 2 and the elasticity of the connecting terminal 2,
Each terminal 11 of this electronic component 10 and the corresponding connection terminal 2 are in close contact with each other.

Referring to FIGS. 3 and 4, the second embodiment of the present invention
In this embodiment, the substrate body 1 is made of insulating plastic.
, a wiring pattern 3 made of insulating plastic, for example, carbon powder-containing plastic, and a connecting terminal 2 connected to the wiring pattern 3 and protruding in the form of a cantilever on the surface of the substrate 1. The substrate body 1 and the wiring pattern 3 are double molded. A chip-shaped electronic component 20 is clamped between a plurality of connecting terminals 2 arranged in two rows, and the elasticity of the connecting terminals 2 protruding like a beam allows the terminals of the electronic component 20 to connect with the corresponding connecting terminals 2. are in close contact.
Note that the tip of the connecting terminal 2 may be covered with a metal thin film that is compatible with solder by plating or the like, and the terminals 11 and 21 of the electronic components 10 and 20 may be fixed with solder.

Further, referring to FIGS. 5 and 6, in the third and fourth embodiments of the present invention, a beam-like portion 5 of insulating plastic protrudes above the substrate body 1.
and connection terminals formed by conductor layers 6 and 7 extending from the wiring pattern 3 to positions corresponding to the terminals 31 and 41 of the electronic components 30 and 40 of the beam-shaped portion 5. This conductor layer 6 is formed by printing. Therefore, it is not limited to insulating plastics. The conductor layer 7 is formed by double molding.

In the above embodiments, the substrate 1 is not limited to insulating plastic. However, since it is made of plastic, its elasticity absorbs the deformation of the electric circuit wiring board itself and the mounted electronic components due to temperature changes, etc.
High connection reliability can be obtained. Furthermore, since the clamp 4 shown in FIG. 1 can also be formed integrally, the effect of constructing the substrate 1 from insulating plastic is great.

〔Effect of the invention〕

As explained above, the present invention provides an electric circuit wiring board that combines an insulating substrate and a conductive wiring pattern, by providing a beam-shaped portion including a protruding connection terminal on the substrate. It is possible to easily and directly mount various types of electronic components, reducing the number of connection steps and achieving high connection reliability.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a plan sectional view, respectively, showing a first embodiment of the present invention, and FIGS. 3 and 4 are a perspective view and a plan sectional view, respectively, showing a second embodiment of the invention, FIGS. 5 and 6 are plan sectional views showing third and fourth embodiments of the present invention, respectively. DESCRIPTION OF SYMBOLS 1... Board body, 2... Connection terminal, 3... Wiring terminal, 4... Clamp, 5... Beam-like part, 6, 7...
Conductor layer, 10, 20, 30, 40...electronic component,
11, 21, 31, 41... terminal.

Claims (1)

[Claims] 1. In an electric circuit wiring board consisting of a substrate made of an insulator and a conductive wiring pattern constituting an electric circuit pattern, at least one of the substrate and the wiring pattern is made of plastic; An electric circuit wiring board characterized in that a body protrudes in a cantilever shape above a substrate body to form a connecting terminal portion that is elastically connected to a terminal of an electronic component mounted on the substrate body.