JP2005125650A - Method for inspecting appearance of copper-clad laminate and end plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an appearance inspection method which enables the easy and sure detection of a minute resin deposit adhering to a copper foil surface of a copper-clad laminate and an end plate surface, and which can greatly enhance the quality of the appearance of the copper foil surface of the copper-clad laminate. <P>SOLUTION: A single-sided or double-sided copper-clad laminate which is composed of copper foil and a prepreg obtained by impregnating a base material for a laminate with a resin and drying it, and a shield plate or a multi-layer board, which is composed of a prepreg, an inner-layer circuit board and copper foil, are sandwiched between mold plates (end plates), laminated together in required numbers and hot-press-molded in the state of being sandwiched between press heating platens, so that the single-sided copper-clad laminate and the double-sided copper-clad laminate, the shield plate and the multilayer board can be manufactured. The appearances of the copper foil surfaces of the single-sided copper-clad laminate and the double-sided copper-clad laminate, the shield plate and the multilayer board are inspected by means of an ultraviolet lamp, and an organic deposit such as the resin, which can be hardly detected by a visual inspection and which is produced from the prepreg, is surely detected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a single-sided copper-clad laminate, a double-sided copper-clad laminate, a shield plate, a copper foil surface of a multilayer board (hereinafter abbreviated as a copper-clad laminate), and a deposit on the appearance inspection of a mirror plate used as a printed circuit board. It is related with the external appearance inspection method which can provide a clean copper clad laminated board and a mirror board easily and reliably.

  With the increase in the density of printed boards for industrial equipment and electronic equipment, the quality requirements for the copper foil surface appearance of the copper-clad laminate used as this board have become increasingly severe. Among the problems of printed circuit boards, circuit defects such as shorts and disconnections due to deposits and dents on the copper foil surface are particularly serious problems that affect quality. The copper clad laminate has a problem that it is easily soiled due to adhesion of resin powder generated from the prepreg to the copper foil surface and the mirror plate surface, adhesion of the resin that has flowed out during pressing, and the like when the material structure of the copper foil, the prepreg, the mirror plate, and the like. Visual and automatic inspections are performed to improve the appearance quality of copper clad laminates and mirror plates, but the inspection time is enormous because the deposits are minute and transparent. Since it is difficult to reliably detect deposits, it is necessary to polish and remove the suspicious part of the copper foil surface of the copper-clad laminate. However, it has been difficult to visually check whether or not it has been removed after polishing, and it has been necessary to set the polishing and water washing stronger when cleaning the end plate.

  However, the conventional visual inspection method has a problem that it cannot completely detect all of the visual inspection even if the visual inspection takes a long time. In addition, when the copper foil surface and the surface of the mirror plate were strongly polished, the appearance of the copper clad laminate and the quality of the plate thickness surface were deteriorated due to the occurrence of unevenness, rust, thickness variation, etc. due to the polishing marks. Establishing an appearance inspection method that can solve these problems has been an issue.

  In view of the actual situation, the present invention can easily and reliably detect minute resin deposits attached to the copper clad laminate copper foil surface and the mirror plate surface, and greatly improve the copper foil surface appearance quality of the copper clad laminate. The present invention provides an appearance inspection method that can be improved.

  As a result of studying to achieve the above object, the present inventor can irradiate the copper clad laminate copper foil surface and the mirror plate surface with an ultraviolet lamp and reliably detect organic deposits such as resin powder that cannot be detected by visual inspection. As a result, the present invention has been completed.

  That is, the present invention is a prepreg obtained by impregnating and drying a resin for a laminate substrate, a single-sided or double-sided copper-clad laminate comprising a copper foil, a prepreg, an inner circuit board, and a shield comprising a copper foil. A single-sided copper-clad laminate, a double-sided copper-clad laminate, a shield plate, and a multilayer plate produced by sandwiching a plate or multilayer plate in a mold plate (mirror plate) The copper foil surface is inspected with an ultraviolet lamp, and the appearance of the copper-clad laminate copper foil is characterized by reliably detecting organic deposits such as resin generated from the prepreg, which is difficult to detect by visual inspection. Regarding the method.

  In addition, the present invention provides a copper clad laminate characterized by performing an appearance inspection on the single-sided copper clad laminate, the double-sided copper clad laminate, the shield plate, and the mirror plate used for the multilayer plate in the same manner as described above. The present invention relates to a method for inspecting an end plate.

  According to the present invention, it is possible to shorten the appearance inspection time of the copper clad laminate copper foil surface and the end plate surface, and since it is not necessary to grind it unnecessarily, the appearance quality is improved and circuit defects can be reduced. The end plate need not be polished more than necessary, and the life can be extended.

  Since this invention only irradiates a copper clad laminated board copper foil surface and a mirror-plate surface with an ultraviolet lamp, it does not ask | require an installation method and a place to a production line, and an offline inspection. The appearance inspection method according to the present invention can be easily detected visually by shining in blue even if it is an organic substance by ultraviolet lamp irradiation. The illuminance, wavelength, distance to the observation object, etc. of the UV lamp are not specified. The illuminance at the inspection location is not specified, although it is easier to see in the dark. By this method, the appearance inspection of the copper clad laminate and the end plate can be easily performed without breaking.

Hereinafter, the present invention will be described based on examples. The present invention is not limited to this.
Example 1

The appearance of both sides of 10 SUS end plates (thickness 2 mm, size 1050 mm × 1050 mm) after pressing the copper clad laminate was examined in a dark room using a hand-held ultraviolet lamp. The conditions at this time were a wavelength of 365 nm, and the distance from the mirror plate surface to the ultraviolet lamp was about 100 mm. As a result of observation, a total of 350 spots that shine blue in a dot shape were detected. As a result of marking these parts and magnifying and observing them at 100 times with an optical microscope, they were resin deposits. The time required for the inspection was 1 hr.
Comparative Example 1

  As a result of conducting a conventional visual inspection before the appearance inspection with the ultraviolet lamp on the same 10 end plates, only 34 resin deposits could be detected, and the required time was 20 hours. It was confirmed that the conventional method had a detection capability of 1/10 or less even when the required time 20 times that of the example was taken.

It is explanatory drawing which shows the outline of this invention.

Explanation of symbols

1 End plate 2 Ultraviolet lamp 3 Eye of inspector 4 Resin deposit

Claims (2)

A prepreg obtained by impregnating and drying a substrate for a laminated board, a single-sided or double-sided copper-clad laminated board made of copper foil, a prepreg, an inner circuit board, a shield board or multilayer board made of copper foil Copper foil of single-sided copper-clad laminate, double-sided copper-clad laminate, shield plate, and multilayer board produced by hot-press molding by sandwiching the required number of mold plates (hereinafter referred to as end plates) and sandwiching them between press hot plates A method for inspecting a copper clad laminate copper foil surface, wherein the surface is inspected with an ultraviolet lamp and organic deposits such as resin generated from a prepreg, which is difficult to detect by visual inspection, are reliably detected. Appearance inspection is performed by the same method as in claim 1 for the end plate used for the single-sided copper-clad laminate, double-sided copper-clad laminate, shield plate, and multilayer plate. Inspection method.

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