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:
Jul. 01, 2003
Filed:
Dec. 02, 1999
Ryo Enomoto, Gihu, JP;
Yasuji Hiramatsu, Gihu, JP;
Ibiden Co., Ltd., , JP;
Abstract
Holes ( ) are formed with a laser beam through an insulating substrate ( ) on which a metallic layer ( ) if formed. After the holes ( A) are formed, via holes ( ) are formed by filling up the holes ( ) with a metal ( ) and a conductor circuit ( ) is formed by etching the metallic layer ( ). Then, a single-sided circuit board ( A) is formed by forming projecting conductors ( ) on the surfaces of the via holes ( ). The projecting conductors ( ) of the circuit board ( A) are put on the conductor circuit ( ) of another single-sided circuit board ( B) with adhesive layers ( ) composed of an uncured resin in between and heated and pressed against the circuit ( ). The projecting conductors ( ) get in the uncured resin by pushing aside the resin and are electrically connected to the circuit ( ). Since single-sided circuit boards ( A, B, C, and D) can be inspected for defective parts before the boards ( A, B, C, and D) are laminated upon another, only defectless single-sided circuit boards can be used in the step of lamination.