Plastic molding device for a semiconductor element
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMinoru Tanaka, Itaru Matsuo
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Abstract
A plastic molding device for a semiconductor element for plastic molding a semiconductor element on a lead frame, which comprises: an upper platen, a lower platen, and a movable platen movably provided at a tie bar which is provided between said two platens; an upper metal mold and a lower metal mold provided at the upper platen and the movable platen, respectively; a motor for applying a raising force for driving the movable platen; a driving force conversion mechanism for converting the rotation force of the motor into a reciprocal force; and a double toggle mechanism for giving the reciprocal force to the movable platen.
Claims8
A plastic molding device for plastic molding a semiconductor element on a lead frame, said molding device comprising:
- an upper platen, a lower platen and a movable platen which are all interconnected by at least one tie bar;
- an upper metal mold provided on said upper platen and a lower metal mold provided on said movable platen;
- power means for reciprocating said movable platen toward and away from said upper platen, said power means comprising:
- a single motor for outputting a rotation force for driving said movable platen;
- a driving force conversion mechanism for converting the rotation force of said motor into a reciprocation force, said force conversion mechanism including a plurality of clutches for varying the speed of said movable platen;
- and
- a double toggle mechanism for connecting a portion of said force conversion mechanism to said movable platen to permit reciprocation of said movable platen.
A plastic molding device for plastic molding a semiconductor element on a lead frame comprising:
- an upper platen, a lower platen, and a movable platen which are all interconnected by at least one tie bar;
- an upper metal mold and a lower metal mold provided on the upper platen and the movable platen, respectively;
- a single motor for outputting a torque sufficient to move said movable platen;
- two series of torque transmission systems for transmitting the torque of the motor to the movable platen having different reduction ratios;
- means for detecting the position of the movable platen;
- and
- means for switching between the two torque transmission systems to permit one of the two systems to transmit the torque from the motor to the movable platen, said means for switching being controlled in accordance with the position of the movable platen detected by the means for detecting.
Dependencies are inferred from the claim text.