Forming Or Treating Mask Used For Its Nonetching Function (e.g., Shadow Mask, X-ray Mask, Etc.) Patents (Class 216/12)
  • Lead frame and manufacturing method therefor
    Patent number: 5437764
    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.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: August 1, 1995
    Assignee: Sony Corporation
    Inventors: Kenji Ohsawa, Makoto Ito, Mutsumi Nagano