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:
Jan. 19, 2021
Filed:
Jul. 30, 2018
Renesas Electronics Corporation, Tokyo, JP;
Shoji Hashizume, Gunma, JP;
Shinichi Nishimura, Gunma, JP;
RENESAS ELECTRONICS CORPORATION, Tokyo, JP;
Abstract
The method of the present invention improves quality and reliability of resin mold-type semiconductor devices. The method includes the steps of placing a lead frame such that cavities of a mold match with device formation regions of the lead frame, respectively, and forming encapsulation bodies that encapsulate semiconductor chips by flowing encapsulating resin into the cavities. The mold with an upper mold half and a lower mold half clamped together has a plurality of first gates that allow the cavities to communicate with a runner, and a dummy-cavity gate that allows a dummy cavity to communicate with the runner. During a resin molding process, from the time when the resin starts flowing into the mold to the time when the encapsulation bodies are formed, an orifice of each cavity gate is larger in size than an orifice of the dummy-cavity gate.