JPS6359840B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for processing printed wiring boards used in electronic equipment.

2. Description of the Related Art Conventionally, in the manufacture of electronic equipment, a printed wiring board is often divided into a plurality of pieces due to the design of the cabinet and space limitations, and these pieces are appropriately arranged at predetermined positions within the cabinet. To do this, it is necessary to use automatic soldering equipment to connect multiple printed circuit boards (printed wiring boards with electronic components mounted on them) after mounting electronic components, taking into consideration the efficiency of the soldering process. A continuous perforation-like parting line was previously provided on the printed wiring board so that it could be divided. However, as electronic devices have become increasingly smaller and lighter in recent years, printed wiring boards are also required to have high-density wiring, and an increasing number of printed wiring boards do not have enough space to make conventional perforations. Furthermore, perforated parting lines can be used for printed wiring boards made of paper-based laminates and the like that can be easily punched, but it has been difficult to use them for glass-based laminates and the like.

As a method to eliminate the above-mentioned drawbacks, for example, Jikosho
As shown in Publication No. 55-42453, a method often used is to provide a V-shaped groove in a straight line from one end to the other on corresponding both sides of a printed wiring board and use it as a dividing line (also called a V-cut). has been done.

Problems to be Solved by the Invention In the conventional printed wiring board dividing line processing method, the end surface of the printed wiring board is usually used as a reference.
V-cut processing is performed so that the dividing line is at a predetermined position a certain distance from the end face. The end faces of printed wiring boards for mass production are often processed by punching or shearing, and there are many unevenness, and the V-cut processing machine itself has processing variations, so it is difficult to accurately form parting lines at predetermined positions from the end face. It cannot be done and there is a large variation. Therefore, when electronic components are mounted on a printed circuit board, the dimensions of the printed circuit board do not match when assembled into the cabinet of an electronic device after cutting the printed circuit board along parting lines. It was necessary to measure all dimensions from the end face to the V-cut.

Furthermore, as printed wiring boards are produced in large quantities, some are produced that do not have the V-cut process, and if such defects are not discovered and electronic components are mounted on the printed wiring board and then soldered. If the problem is discovered after installation, there is a problem in that there will be a lot of waste in parts material costs and man-hours.

The present invention is intended to solve the above-mentioned problems, and is intended to easily check the positional dimensions of V-cut machining, U-cut machining, etc., and easily detect forgetting of machining.

Means for Solving the Problem In order to solve this problem, the present invention provides that, when performing linear dividing groove processing for dividing the printed circuit board into a plurality of printed circuit boards, the edges of the printed circuit board are At the same time, a notched V-shaped groove is formed at a location corresponding to the dividing groove, and a minute scale for checking deviation is formed near the V-shaped groove.

According to this configuration, the position of the dividing groove in V-cut processing, U-cut processing, etc. is determined by adjusting the position of the dividing groove between the protrusion of the notch of the V-shaped groove provided at the edge of the printed wiring board and the dividing groove. By checking, you can visually determine how much the deviation is. Further, by inspecting the cutout portion of the cross-shaped groove at the edge of the printed wiring board, it is possible to easily detect visually any omissions in processing such as V-cut processing or U-cut processing.

Embodiment An embodiment of the present invention will be described below based on the accompanying drawings.

In FIGS. 1, 2, and 3, 1 is a printed wiring board, 2 is a dividing groove formed by V-cut processing,
3 is a notch of a V-shaped groove, and 4 is a microscale for checking misalignment, and is a schematic diagram showing a method of processing a printed wiring board according to the present invention.

Here, printed wiring boards include paper phenol laminates, paper epoxy laminates, paper polyester laminates,
A conductive circuit pattern such as a copper foil circuit or a circuit printed with a conductive paste of silver, copper, carbon, etc. is formed on an insulating substrate such as a glass epoxy laminate, a composite type laminate, or a ceramic substrate.

A method of processing a printed wiring board according to the present invention will be described using a paper phenol copper-clad laminate as an example.

Etching resist is screen printed on the paper phenol copper clad laminate, unnecessary portions of the copper foil are removed using an etching solution, and a conductive circuit pattern is formed using the copper foil. Next, if necessary, screen print a solder resistor on the entire surface except for the parts to be soldered and the terminal parts.

Next, a road map or service map to show the layout of electronic components is screen printed. At the same time, minute scales are cut in the V-shaped grooves so that they are perpendicular to the dividing line of the V-cut or U-cut. Place the notch near the location where you plan to make the notch. For example, the thickness of the scale line is 0.10mm,
The distance between the scale lines is 0.10mm. This minute scale is used when etching the copper foil mentioned above.
A pattern of minute scales made of copper foil can also be provided. Next, punching is performed using a mold to form the external shape of the workpiece to the size used in the electronic component assembly process, and at the same time, through-holes for inserting electronic components are also provided to create multiple A printed wiring board 1 (four printed wiring boards in FIG. 2) is obtained. Here, during the punching process, V-shaped groove notches are provided at both end edges of the printed wiring board at positions corresponding to dividing grooves 2 for dividing the printed circuit board after electronic components are mounted.

Next, the dividing grooves 2 are set so as to pass through the protrusions of the V-shaped grooves provided at both end edges of the printed wiring board 1, and the dividing grooves 2 are processed.

By processing the printed wiring board in this manner, alignment during V-cut processing or U-cut processing is easier and more accurate than when using the end face of the printed wiring board as a reference. Furthermore, if the dividing line 4 or 5 deviates from the predetermined position as shown in FIG.
Since the protrusion of the notch 3 of the V-shaped groove is exposed, misalignment can be easily detected visually. Furthermore, since the magnitude of the deviation can be measured as a numerical value from the position of the dividing line that intersects with the minute scale near the V-shaped groove, it is easy to distinguish between defective and non-defective products by comparing it with the numerical value used as the standard for determining pass/fail. Can be sorted. In addition, by inspecting the notch 3 of the V-shaped groove at the edge of the printed wiring board, it is possible to easily determine whether dividing line processing has been performed or not. Even if there is forgetfulness, it can be easily detected.

Effects of the Invention As described above, according to the present invention, a notch in the form of a V-shaped groove is provided at the edge of the printed wiring board, and a fine scale for checking deviation is provided. Since dividing grooves are provided to divide the printed circuit board, the positional accuracy of the dividing grooves is high, and it is also possible to easily visually detect defective positioning of the dividing grooves or forgetting to process the dividing grooves, which has great industrial value. It is a great thing.

[Brief explanation of drawings]

Fig. 1 is a partially enlarged plan view of a printed wiring board showing an embodiment of the present invention, Fig. 2 is a plan view of a printed wiring board showing an embodiment of the invention, and Fig. 3 is a side view thereof. FIG. 4 is a plan view of a printed wiring board showing misalignment of dividing grooves when explaining an embodiment of the present invention. 1...Printed wiring board, 2...Dividing groove, 3...
V-shaped groove notch, 4...microscale.

Claims (1)

[Claims] 1. When creating linear dividing grooves for dividing into multiple printed circuit boards, a cutout V-shaped groove is provided in advance at the edge of the printed wiring board at a location corresponding to the dividing groove. A method for processing a printed wiring board, characterized in that a minute scale for checking deviation is formed near the V-shaped groove.