JPH05152724A - Manufacture of printed wiring board - Google Patents

Abstract

PURPOSE:To correct disconnection with high reliability and high working efficiency by applying air-blow to a disconnection correction part. CONSTITUTION:A metal foil clad multilayered board or the like can be used as a printed wiring board. For disconnection correction in an inspection process, all welded ribbons like a gold-plated Kovar wire and a copper alloy wire can be used, and correction apparatus also is not specially restricted. As a judgement method, the following are used; visual observation using a magnifier, optical pattern inspection by a fluorescence method or a reflection method, electric inspection, etc., wherein air-blow on the disconnection correction part is necessary. Thereby external force except the air blow is not applied for disconnection correction, so that the disconnection correction part is not damaged, reliability is improved, and inspection is facilitated. As a result, working efficiency can be improved. The pressure of air blow cam arbitrarily and is not restricted within a specified range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a printed wiring board used in electric equipment, electronic equipment, communication equipment, computing equipment and the like.

[0002]

2. Description of the Related Art In a conventional printed wiring board, a circuit pattern of an inner layer material or an outer layer material is repaired by connecting the disconnection repairing portion with a welding ribbon such as a Kovar wire with gold plating or a copper-silver alloy wire. In order to determine whether or not the wire is good or bad, external force is applied to the wire breakage correction section with tweezers or a scriber to observe the movement and resistance of the wire breakage correction section by visual inspection with a magnifying glass, but the reliability is poor and work efficiency is poor. That's it.

[0003]

As described in the prior art, the conventional wire breakage correction in the inspection process of a printed wiring board has the drawbacks of lacking reliability and poor work efficiency.
The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a method for manufacturing a printed wiring board that can perform disconnection correction with high reliability and high work efficiency.

[0004]

The present invention provides a method for manufacturing a printed wiring board, which is characterized in that in the inspection step of the printed wiring board, air is blown to the disconnection correcting portion. Therefore, the above object can be achieved. Now, the present invention will be described in detail.

As the printed wiring board used in the present invention,
Resin, phenol, epoxy, unsaturated polyester resin, polyimide, fluororesin, polyphenylene oxide, etc. alone, modified products, it is possible to use a mixture, the resin, inorganic fibers such as asbestos, polyester, polyamide, On the upper and / or lower surface of the required number of prepregs impregnated with a base material such as woven cloth, non-woven cloth, mat, and paper made of organic fibers such as polyacryl, polyvinyl alcohol, polyimide, and fluororesin, and natural fibers such as cotton. It is possible to use a metal foil-clad laminate obtained by disposing and forming a metal foil made of copper, aluminum, brass, nickel, iron or the like alone, an alloy, or a composite foil. For the disconnection correction in the inspection process, conventional welding ribbons in general can be used, such as Kovar wire with gold plating, copper-silver alloy wire, etc., and there is no particular limitation, and correction equipment is, for example, manufactured by Nippon Avionics Co., Ltd. MCW-550ELP
Etc. are used, but are not limited thereto. As the determination method, visual inspection with a magnifying glass, optical pattern inspection by a fluorescence method or reflection method, electrical inspection, or the like is used, but it is necessary to blow air to the disconnection correction portion. By doing so, since no external force other than air is applied to the disconnection correction portion, the disconnection correction portion is not damaged, reliability is improved, and inspection is facilitated, so that work efficiency can be improved. is there. The degree of air blow pressure is arbitrary and is not particularly limited.

The present invention will be described below based on examples.

[0007]

Example 1 A dry film with a protective film and a pattern film were overlaid on one side of a 1 mm thick double-sided copper-clad glass cloth substrate epoxy resin laminate, and exposed by an exposure machine to print a pattern. After performing the same treatment on the back side as well, an etching treatment was performed to obtain an inner layer material having circuits on both sides.
Since there is a disconnection part, the disconnection part was corrected with MCW-550ELP, Kovar wire welding ribbon with gold plating, manufactured by Japan Avionics Co., Ltd., and air was blown at 0.5 kg / cm ^{2 to} the disconnection correction part, and after confirmation of the disconnection correction part After arranging two epoxy resin glass prepregs each having a thickness of 0.1 mm above and below the inner layer material, a thickness of 0.035 mm is further provided on the outermost side thereof.
The laminated body on which the copper foil of
A four-layer printed wiring board was obtained by performing lamination molding at m ² and 170 ° C. for 120 minutes.

[0008]

Example 2 A four-layer printed wiring board was obtained in the same manner as in Example 1 except that the welding ribbon was a copper-silver alloy wire and the air blow pressure was 1.0 kg / cm ² .

[0009]

[Comparative Example] A four-layer printed wiring board was obtained in the same manner as in Example 1 except that air blowing was not performed.

The performance of the printed wiring boards of Examples 1 and 2 and Comparative Example is as shown in Table 1. Note: Productivity is the ratio when the conventional value is 100.

[0011]

The present invention is constructed as described above.
In the method for manufacturing a printed wiring board having the configuration described in the claims, there is an effect that circuit pattern reliability and productivity are improved.

Claims (1)

[Claims] 1. A method of manufacturing a printed wiring board, characterized in that in the step of inspecting the printed wiring board, air is blown to the disconnection correcting portion.