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:
Dec. 02, 2014
Filed:
Mar. 15, 2011
Akihiko Tateiwa, Nagano, JP;
Masahiro Kyozuka, Nagano, JP;
Fumimasa Katagiri, Tempe, AZ (US);
Shinko Electric Industries Co., Ltd., Nagano-Shi, JP;
Abstract
A wiring board has a structure where multiple wiring layers are stacked one on top of another with insulating layers interposed therebetween. A sheet-shaped member is buried in an outermost insulating layer located on a side of the structure opposite to a side on which a semiconductor element is to be mounted. The sheet-shaped member has a modulus of elasticity and a coefficient of thermal expansion which are similar to a modulus of elasticity and a coefficient of thermal expansion of the semiconductor element. The sheet-shaped member is made of a material having a modulus of elasticity and a coefficient of thermal expansion which are enough to bring respective distributions thereof into a substantially symmetric form in a direction orthogonal to a surface of the wiring board in the case where the semiconductor element is mounted.