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. 22, 2000
Filed:
Jun. 12, 1997
Hiroshi Sugimoto, Ibaraki, JP;
Hiroki Tanaka, Ibaraki, JP;
Shigeo Hagiya, Ibaraki, JP;
Takaharu Yonemoto, Ibaraki, JP;
Hitachi Cable, Ltd., Tokyo, JP;
Abstract
A lead frame for semiconductor device comprises first inner leads 21-2, 21-3 and 21-4 each having a region 22-2, 22-3, 22-4 on which a predetermined quantity of adhesive is applied, and second inner leads 21-1 and 21-5 each having a region 22-1, 22-5 which is wider than those of the first inner leads. The first inner leads 21-2, 21-3 and 21-4 have a width W.sub.1, while the second inner leads 21-1 and 21-5 have a width W.sub.2 which is wider than W1. The second inner leads 21-1 and 21-5 are arranged at the positions where one successive application of varnish-like adhesive to the inner leads begins and ends, respectively. The ratio of W.sub.1 to W.sub.2 is preferably 1 to 1.3 (i.e., W.sub.1 :W.sub.2 =1:1.3) or more. Even if an excessive quantity of varnish-like adhesive is applied to the beginning inner lead 21-1 or the ending inner lead 21-5, it is spread over the region 22-1 or 22-5, then adhesive layers having uniform thickness are formed.