Manufacture of lead frame

Abstract

Abstract PURPOSE:To contrive simplification of the forming process of protrusion to be used for outer terminal by a method wherein an etching is performed on a metal plate based on the negative plate arranged on one surface of the metal plate, and a half etching is performed on the metal plate based on the negative plate arranged on the other surface of the metal plate. CONSTITUTION:After photosensitive resin 2 has been applied on both sides of the metal plate 1 to be used for construction of a lead frame, a negative plate 3 having lead-frame-shaped pattern 3 is arranged on one surface, and a negative pattern 4 having a protrusion to be used for outer terminal is arranged on the other surface. Then, after the patterns on the negative plates 3 and 4 have been printed, a developing process is performed, and resist patterns 5a and 5b are obtained. Subsequently, an aperture part 6 is formed by performing an etching through the intermediary of resist pattern 5a and, at the same time, a half etching is performed through the intermediary of the resist pattern 5b, and a protruded part 8 to be used for outer terminal is formed.

Inventors

• 👤 Tomihiro Nakada
• 👤 中田　富紘
• 👤 Koji Ishida
• 👤 晃司 石田

Bibliographic Details