JPH0661603A - Printed wiring board and production thereof - Google Patents

Abstract

PURPOSE:To eliminate trouble in conduction test caused by limited circuit width and pitch of a printed wiring board to fit a connector having pitch as short as 0.5mm. CONSTITUTION:A wide circuit part 3 for facilitating contact of a contact pin at the time of conduction test is provided on a part of a completed printed wiring board 1 which is eventually removed through punching thus facilitating conduction test.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board, and more particularly to a printed wiring board of a type used by being integrated with a narrow-pitch connector such as 0.5 mm pitch and a method for manufacturing the same.

[0002]

2. Description of the Related Art A printed wiring board is generally manufactured as follows. That is, on the copper foil surface of the copper-clad substrate,
A circuit is formed by performing exposure, pattern formation, etching, and the like. Next, the copper foil is left exposed at the parts where component mounting or wiring or connection with a connector is exposed, the other parts are covered with a cover lay, and finally punched as a product of a predetermined shape. In this manufacturing, in the case of a printed wiring board to be fitted with a narrow pitch connector of 0.5 mm pitch, the circuit at the end has a circuit width of 0.35 mm (+ 0.03,-
0.04) as a standard.

[0003]

The above-mentioned circuit width of 0.35
If a contact pin is used to conduct a continuity test of a plurality of circuits with a pitch of 0.5 mm and a pitch of 0.50 mm, it is necessary to have very high accuracy in mounting the contact pins and mounting the printed wiring board in the circuit inspection machine. Even if one product needs to be inspected many times to inspect it, or even if the inspection results in poor continuity, there is a defective continuity in the circuit of the product. There may be cases where it is difficult to judge whether there was any.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a circuit pattern capable of easily conducting a continuity test even in such a narrow printed circuit board having a narrow circuit width and a narrow circuit width. That is, when the printed wiring board is a finished product, a wide circuit portion that allows the contact pins of the continuity test to easily contact is provided in a portion that is to be removed by punching or the like to facilitate the inspection. It is characterized by doing.

[0005]

EXAMPLE An example will be described with reference to FIG. In FIG. 1, reference numeral 1 represents an end portion of a product portion of a printed wiring board, and reference numeral 4 represents a circuit thereof with a width of 0.35 mm and 0.5 mm.
Formed at a pitch of. 2 is a portion to be removed later by punching or the like at A to A ', but as in B, a bulged portion 3 is provided in the circuit in a staggered arrangement with a maximum width of about 0.6 to 0.7 mm. In the continuity test, by applying the contact pin to this bulged part, there is no problem in the inspection even if the mounting accuracy of the contact pin and the mounting accuracy of setting the printed wiring board on the circuit inspection machine are relaxed. As a result, it helped speed up the inspection and improve the reliability of the inspection.

[0006]

As described in the embodiments, according to the present invention, the circuit width of the product is narrow and the pitch of the circuit is small, such as a printed wiring board of a type in which a connector having a narrow pitch of 0.5 mm is fitted. In the continuity test of the Mosei printed wiring board, speed up the continuity test,
Moreover, the reliability of the inspection could be improved.

[Brief description of drawings]

FIG. 1 shows an example of a circuit pattern of a printed wiring board according to the present invention.

FIG. 2 shows an example of a conventional circuit pattern.

[Explanation of symbols]

1: The end of the product part of the printed wiring board 2: The part to be removed by punching after the inspection 3: The part where the circuit width is enlarged to make it easier to touch the contact pin of the continuity test 4: The circuit at the end of the product 5: Conventional continuity test The part where the contact pin was touched by

Claims (2)

[Claims] 1. A printed wiring board, characterized in that a circuit portion having a width wider than the width of the circuit at the end portion of the finished product is provided for continuity inspection in a portion to be removed by punching or the like in the finished product. 2. A printed wiring characterized in that a contact pin is brought into contact with the wide circuit portion according to claim 1 to conduct a continuity test, and the wide circuit portion for inspection is removed in a finished product. Method of manufacturing a plate.