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    • 5. 发明授权
    • Plastic lens
    • 塑料镜片
    • US06219191B1
    • 2001-04-17
    • US09604927
    • 2000-06-28
    • Makoto IwakiHaruyuki Ohashi
    • Makoto IwakiHaruyuki Ohashi
    • G02B702
    • B29D11/00932G11B7/1374G11B7/22
    • A plastic lens which can be positioned correctly during lens mounting. The plastic lens is used as a pickup lens on an optical head for an optical disk and it has a lens portion in the center with an annular rim formed on the periphery. The rim has two opposed surfaces, one of which provides a reference plane to effect positioning for fixing the plastic lens in a lens holder. The rim has a gate portion which remains to project from the periphery after a molten plastic material was injected through the corresponding channel during molding. The gate portion is cut off by a pair of cutting blades which are moved to come closer to each other in a direction substantially parallel to the optical axis of the lens portion. As the result of the cutting operation, a bur occurs at a distal end of the gate portion and it projects in a direction parallel to a plane orthogonal to the optical axis.
    • 镜头安装时可以正确放置的塑料透镜。 塑料透镜用作光盘用光学头上的拾取透镜,并且其中心具有形成在周边上的环形边缘的透镜部分。 边缘具有两个相对的表面,其中一个相对的表面提供参考平面以实现将塑料透镜固定在透镜保持器中的定位。 在模制期间,熔融塑性材料通过相应的通道注入后,边缘具有保留从周边突出的浇口部分。 门部分被一对切割刀片切断,所述一对切割刀片沿着基本上平行于透镜部分的光轴的方向彼此靠近移动。 作为切割操作的结果,在门部的远端处产生毛刺,并且在与光轴正交的平面平行的方向上突出。