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US 2008/0185747 A1Published application
Injection mold and partial compression molding method
AssigneeCanon Kabushiki Kaisha
InventorsTeruaki Uezaki, Takashi Arai, Yoshihiro Iitsuka
Life of this patent
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Abstract
In an injection mold, a compression pin is placed at a cavity surface by the pressing force of a biasing member, and is moved rearward by the pressure of filled resin so as to form a compression boss. After the completion of filling, the compression boss is compressed by the compression pin.
Claims6
An injection mold comprising:
- a stationary mold section;
- a movable mold section that forms a cavity between the movable mold section and the stationary mold section;
- a compression pin extending through the movable mold section and having a front end face that forms a part of a cavity surface;
- a biasing member provided in the compression pin so that the front end face of the compression pin is caused to retreat from the cavity by the pressure of resin;
- and
- a driving unit configured to advance the retreating front end face of the compression pin toward the cavity.
3 more elements
A partial compression molding method comprising the steps of:
- forming a surface of a cavity by a stationary mold section, a movable mold section, and a front end face of a compression pin;
- filling the cavity with molten resin;
- forming a compression boss by causing the front end face of the compression pin to retreat from the cavity surface by the pressure of the filled resin;
- and
- moving the resin in the compression boss into the cavity by advancing the compression pin toward the cavity after filling of the resin is completed.
2 more elements
Dependencies are inferred from the claim text.