Anisotropic conductive sheet, its manufacturing method, and inspection device for circuit board

Abstract

Disclosed herein are an anisotropically conductive sheet that can retain necessary conductivity over a long period of time upon its repeated use even when its thickness is small, and thus permits achieving high resolving power and long service life, a production process thereof, and an inspection apparatus for circuit boards equipped with this anisotropically conductive sheet. The anisotropically conductive sheet of the invention comprises a base material composed of an insulating elastic polymeric substance and a great number of conductive particles exhibiting magnetism, which are contained in the base material in a state oriented in a thickness-wise direction of the sheet to form chains, wherein an insulating reinforcing material formed of mesh is contained in the base material. The production process of the anisotropically conductive sheet of the invention comprises preparing a molding material with conductive particles exhibiting magnetism contained in a polymeric substance-forming material, which will become an elastic polymeric substance by being cured, forming a molding material layer containing a reinforcing material formed of mesh in a state immersed in the molding material, and subjecting the molding material layer to a curing treatment while applying or after an application of a magnetic field to the molding material layer in a thickness-wise direction thereof.

Description

technical field [0001] The present invention relates to an anisotropic conductive sheet preferably used as a connector in electrical connection between circuit devices such as electronic components or in inspection equipment for circuit boards such as printed circuit boards, and a manufacturing method thereof, and inspection equipment for circuit boards equipped with such anisotropic conductive sheets. Background technique [0002] An anisotropic conductive sheet is a thin sheet of a pressure-sensitive conductive conductor that exhibits conductivity only in its thickness direction or that exhibits conductivity only in its thickness direction when it is squeezed in its thickness direction Portion of flakes. Since the anisotropic conductive sheet has such characteristics that a dense electrical connection can be achieved without using any means such as welding or mechanical fitting, and a flexible connection that can absorb mechanical shock or stress is also possible, it is w...

AI Technical Summary

Problems solved by technology

[0012] However, an anisotropic conductive sheet having a small thickness is prone to permanent deformation by contact under pressure and deformation due to abrasion during repeated use

As a result, its conductivity deteriorates prematurely, so it is difficult for this anisotropic conductive sheet to have a long life

Therefore, the use of such an anisotropic conductive sheet in the inspection of a large number of circuit boards involves problems in that the inspection efficiency is low, and inspection costs are caused because the frequency of replacing the anisotropic conductive sheet with a new one is high. Increase

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