A blade of an exposure control such as an iris control device or a shutter control device is provided for use in cameras. A sheet of a resin or metallic material configured as desired into the final blade form is placed in an injection molding machine which has a pin-forming cavity on one side of the sheet. The sheet is broken and penetrated at its portions where pins are to be formed and fixed, such that portions of the material of the sheet are deformed to project into the cavity. A molten resin is injected through a sprue formed on the opposite side of the sheet to the cavity so that the injected resin fills the cavity to form a pin in such a manner that the deformed and projected portion of the material of the sheet is embedded in the pin-forming resin. Another pin is formed on the other side of the sheet simultaneously with the first-mentioned pin in the same manner in the same die apparatus.
申请公布号
US4956139(A)
申请公布日期
1990.09.11
申请号
US19870105017
申请日期
1987.10.06
申请人
CANON DENSHI KABUSHIKI KAISHA
发明人
KOIZUMI, HIROSHI;KAWATA, HIDEAKI;ARAI, KATSUMI;MIYAMOTO, KOJI;ICHIKAWA, TADAAKI;OGATA, KOJI