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:
Aug. 01, 1995
Filed:
May. 24, 1994
Applicant:
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B44C / ; C23F / ;
U.S. Cl.
CPC ...
216 14 ; 257673 ; 437220 ; 216 12 ; 216 37 ; 216 41 ;
Abstract
An inner lead of a lead frame has an outer end portion extending so as to be connected with a side surface of an etching stop layer and with an upper surface of an outer lead. The outer lead is formed by etching both surfaces of a metal base, and the inner lead is formed by plating metal on the metal base with a resist layer used as a mask. The pitch of the outer lead can be made fine, and a bonding strength of the inner lead to the outer lead can be increased.