Abstract: 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.

Abstract: A unit for suppressing knocking in a gasoline engine includes a knocking sensor for sensing knocking and outputting a signal indicative thereof, engine control means for controlling the operating condition of the engine, control variable correcting means responsive to the output from the knocking sensor for correcting a control variable in the engine control means in such a manner that knocking will be suppressed, an engine temperature sensor for sensing engine temperature and determining whether the engine is cold or hot, and correction amount modifying means which, if the engine is cold, modifies the extent to which the control variable is corrected to suppress knocking in such a manner that the amount of correction is made smaller than that which prevails when the engine is hot.