JPH04359487A - Printed wiring board - Google Patents

Abstract

PURPOSE:To prevent a plating layer from remaining at a perforation on a main body side when a disposable printed wiring board is cut off by providing an idle hole which is paired with the perforation at the disposable printed wiring board, fitting separation auxiliary parts which interlock both holes of the perfo rated and the idle hole which oppose each other, and then soldering the fitted portion into each hole. CONSTITUTION:A jumper wire 8 is fitted into a perforation 3 and an idle hole 4 which are paired each other and both are soldered for mounting. Then, a main body side printed wiring board 1 and a disposable printed wiring board 2 are separated. In this caee, since the soldering and copper-plating layer within the perforation 3 has a stronger fixing strength to a jumper wire 8 than that to the main body side printed wiring board 1, it is separated from the main body side printed wiring board 1 along with the disposable printed wiring board 2 and the jumper wire 8, thus preventing a solder and copper-plated layer from remaining within the main body side perforation 9. Therefore, the copper-plated layer and solder of the main body side perforation can positively be removed to the disposable printed wiring board side by utilizing auxiliary parts for separation without increasing the number of processes.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to printed wiring boards.

0002

2. Description of the Related Art Conventionally, holes for positioning are generally provided in a printed wiring board not only when manufacturing a printed wiring board but also when mounting electronic components on the manufactured printed wiring board using an automatic machine. ing. The portion having the positioning hole will eventually become unnecessary, and will be separated from the main body side substrate by the perforation hole and discarded. However, when perforations are formed on the printed wiring board, especially a composite double-sided through-hole board, and plating is applied to the through-hole holes for establishing electrical continuity between the wiring patterns on both sides, the perforations are The plating layer also adheres,
When a disposable board with a positioning hole is separated from the main body, a plating layer may remain attached to the cut-off end face of the main body, that is, any part of the broken perforation, and due to the remaining plating layer, It is predicted that the insulation properties of the printed wiring board itself will deteriorate and other undesirable situations will occur.

[0003] Conventionally, therefore, a manufacturing method has been adopted in which a plating layer is not provided at the perforation at the time when the sacrificial substrate is separated from the main body by the perforation.

0004

[Problems to be Solved by the Invention] However, in the above manufacturing method, after plating the holes for through holes, etc., secondary processing is performed to form perforations, and as a result, The number of man-hours increased, leading to higher costs.

The present invention has been made to solve the above-mentioned problems, and utilizes the widely used printing method as it is in printed wiring boards in which through-hole holes are plated. To provide a printed wiring board that can reliably prevent a plating layer from remaining in perforations on the main body side when a waste board is separated from the main body without increasing the number of steps.

[0006]

[Means for Solving the Problems] In order to achieve this object, the present invention targets a printed wiring board in which perforations for separation are provided between a main body side board and a disposable board, and particularly, A second hole is provided in the substrate to form a pair with the perforation hole, and a separation auxiliary part for connecting the two holes is inserted into the perforation hole and the second hole which are opposite to each other, and the separation auxiliary part is Each fitting portion is soldered into each hole.

[0007]

[Function] In the printed wiring board of the present invention having the above configuration, when separating, the solder in the perforation hole and the copper plating on the inner wall of the perforation hole are firmly fixed to the legs of the separation auxiliary part. All the copper plating and solder from the main body side board to be used, along with the separation auxiliary parts, will adhere to the discarded board side.
It will not remain in the perforations of the main body side board to be used.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to the drawings.

FIG. 1 shows a printed wiring board embodying the present invention, in which perforations 3 and slits 9 for separation are provided between a main body side board 1 and a disposable board 2. There is. A sacrificial hole 4 is provided in the sacrificial substrate 2, one for each perforation hole 3. The component mounting hole 5, the perforation hole 3, and the sacrificial hole 4 are all through holes having a copper plating layer. The component mounting hole 5 is used to insert the electronic component 7 when mounting the component, and the holes 3 and 4 are connected to each of the perforations 3 and the sacrificial hole 4 facing them. A jumper wire 8 (constituting an auxiliary part for separation) is inserted.

Next, a method for manufacturing a printed wiring board will be described, particularly the main parts of the present invention.

As shown in FIG. 2, the electronic component 7 is inserted into the component mounting hole 5 of the main body side board 1, and the separation auxiliary component is inserted into the perforation hole 3 and the waste hole 4, which are paired with each other. A certain jumper wire 8 is inserted and both are soldered and mounted. Thereafter, the main body side substrate 1 and the disposable substrate 2 are separated. FIG. 3 shows the process of separating the disposable board 2. The solder and copper plating layer in the perforation hole 3 have a stronger fixing strength to the jumper wire 8 than the fixing strength to the main body side board 1, so It is separated from the main body side substrate 1 together with the substrate 2 and jumper wires 8. Therefore, as shown in FIG. 4, no solder or copper plating layer remains within the perforations 9 on the main body side.

0012

Effects of the Invention As is clear from the above explanation, according to the printed wiring board of the present invention, the copper plating layer and solder in the perforations on the main body side can be removed as an auxiliary material for separation without increasing costs such as secondary processing. You can use the parts to reliably remove them to the disposal board.

[Brief explanation of the drawing]

FIG. 1 shows a printed wiring board of a first embodiment.

FIG. 2 is a diagram in which electronic components and jumper wires, which are separation auxiliary components, are fixed to the printed wiring board.

FIG. 3 is a diagram showing a process of separating a waste substrate.

FIG. 4 is a diagram after the waste substrate is separated.

[Explanation of symbols]

1 Main body side board 2 Discarded board 3 Perforation hole 4. Disposable hole 8 Jumper wire (separation auxiliary part)

Claims (1)

[Claims] 1. A printed wiring board in which a perforation for separation is provided between a main body side board and a sacrificial board, wherein the sacrificial board is provided with a sacrificial hole that pairs with the perforation,
A separation auxiliary part for connecting the two holes is fitted into the perforation hole and the waste hole which are opposed to each other, and each fitted part of the separation auxiliary part is soldered into each of the holes. Printed wiring board.