The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2021
Filed:
Aug. 06, 2018
Sumitomo Electric Industries, Ltd., Osaka, JP;
Sumitomo Electric Printed Circuits, Inc., Shiga, JP;
Kenji Takahashi, Osaka, JP;
Koji Nitta, Osaka, JP;
Shoichiro Sakai, Osaka, JP;
Junichi Okaue, Shiga, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
SUMITOMO ELECTRIC PRINTED CIRCUITS, INC., Shiga, JP;
Abstract
A printed circuit board according to one aspect of the present invention includes an insulating layer having a through-hole, a conductive layer laminated on an inner circumferential surface of the through-hole, and metal plating layers laminated on a surface of the conductive layer facing opposite the insulating layer and laminated on both surfaces of the insulating layer, wherein an average thickness of the insulating layer is greater than or equal to 5 μm and less than or equal to 50 μm, wherein an average thickness of the metal plating layers is greater than or equal to 3 μm and less than or equal to 50 μm, wherein a hole diameter of the through-hole gradually increases from a first end of the through-hole at one surface of the insulating layer to a second end of the through-hole at another surface of the insulating layer, wherein the hole diameter of the through-hole at the first end is greater than or equal to 1.5 times, and less than or equal to 2.5 times, the average thickness of the metal plating layers, and wherein the hole diameter of the through-hole at the second end is greater than or equal to 1.1 times, and less than or equal to 2 times, the hole diameter of the through-hole at the first end thereof.