PRINTED WIRING BOARD, MANUFACTURING METHOD OF PRINTED WIRING BOARD, AND ELECTRONIC DEVICE

PROBLEM TO BE SOLVED: To prevent a product from warping and twisting due to difference of thermal expansion coefficients.SOLUTION: A printed wiring board includes: a wiring through-hole part 5 that includes a wiring through hole 5A formed across the thickness of a surface part 2A of a base material...

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Bibliographische Detailangaben
Hauptverfasser:	IIDA KENJI, MAEHARA YASUTOMO, YOSHIMURA HIDEAKI
Format:	Patent
Sprache:	eng
Schlagworte:	CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS PRINTED CIRCUITS TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prevent a product from warping and twisting due to difference of thermal expansion coefficients.SOLUTION: A printed wiring board includes: a wiring through-hole part 5 that includes a wiring through hole 5A formed across the thickness of a surface part 2A of a base material 2 and that uses an insulation material 6B having a thermal expansion coefficient different from the thermal expansion coefficient of the base material 2; and a heat expansion adjustment part 6 that includes a lower hole 6A formed in the surface part 2A of the base material 2 and that is formed by filling the lower hole 6A with the insulation material 6B. The heat expansion adjustment part 6 is arranged in cells 20, which are defined in the surface part 2A of the base material 2, in accordance with an arrangement location of the wiring through-hole part 5 in the cells 20 so that a difference of thermal expansion coefficients in vertical and horizontal directions in the cell 20 is minimum.