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US 5,492,233 AGranted
Manufacturing method for lead frame
AssigneeFujitsu Limited
InventorToshihiro Kusagaya
Life of this patent
Estimating the term…
Abstract
Disclosed herein is a manufacturing method for a lead frame, including the steps of forming a lead element, forming masks on a first surface and a second surface of the lead element, etching the lead element, and removing the masks. According to this method, the lead frame can be manufactured at low costs without the necessity of machining of the lead element.
Claims5
A manufacturing method for a lead frame, comprising:
- the first step of forming an elongated lead element having a first surface and a second surface parallel to each other;
- the second step of forming a first mask on said first surface so that said first mask extends from a first end of said lead element toward a second end of said lead element and terminates at a mid position between said first end and said second end, and forming a second mask on said second surface so that said second mask extends from said second end toward said first end and terminates at a mid position between said second end and said first end;
- the third step of etching said first surface and said second surface of said lead element;
- and
- the fourth step of removing said first mask and said second mask.
2 more elements
Dependencies are inferred from the claim text.