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1. 发明授权

US4763314A Linear actuator for an optical disk storage apparatus 失效
标题翻译：用于光盘存储装置的线性致动器
公开(公告)号：US4763314A
公开(公告)日：1988-08-09
申请号：US896392
申请日：1986-08-13
申请人： Martin J. McCaslin , John C. Kolar
发明人： Martin J. McCaslin , John C. Kolar
IPC分类号： G11B7/085 , H02K41/035 , G11B17/00
CPC分类号： H02K41/0356 , G11B7/08582
摘要： A linear actuator for controlling access to a track element belonging to a plurality of adjacent track elements arranged in a reference surface of an optical disk rotatable about a spindle. The linear actuator includes an objective lens for projecting a light spot for interaction with a selected one of the track elements. A first moving mechanism is provided for supporting the objective lens for movement along a first direction substantially perpendicular to the reference surface for controlling the focusing of the light spot. A second moving mechanism in the linear actuator supports the objective lens for movement along a second direction substantially parallel to the reference surface and generally transverse to the track elements for controlling the access thereto. The second moving mechanism includes a pair of spaced apart, parallel rods which extend generally transverse to the track elements. The rods have a round cross-section and are made of a ferromagnetic material. The objective lens is supported by a carriage which is engaged with the rods for movement along the same. A pair of round actuator coils are connected to the carriage and surround corresponding ones of the rods for linear movement along the same. Each rod is partially surrounded by a generally C-shaped radially polarized permanent magnet so as not to obstruct movement of the carriage along the rod. A return flux path is provided adjacent each of the magnets.
摘要翻译：线性致动器，用于控制对属于布置在可围绕主轴旋转的光盘的参考表面中的多个相邻轨道元件的轨道元件的接近。线性致动器包括用于投射光斑以与所选轨道元件相互作用的物镜。提供第一移动机构，用于支撑物镜沿着基本上垂直于参考表面的第一方向移动，以控制光点的聚焦。线性致动器中的第二移动机构支撑物镜沿着基本上平行于参考表面的第二方向运动，并且大致横向于轨道元件以控制对其的访问。第二移动机构包括大致横向于轨道元件延伸的一对间隔开的平行杆。杆具有圆形横截面并且由铁磁材料制成。物镜由与该杆接合的托架支撑，以便沿其移动。一对圆形致动器线圈连接到滑架并且围绕相应的一个杆，用于沿着它们的线性运动。每个杆部分被大致C形的径向极化永磁体包围，以便不妨碍滑架沿着杆的移动。在每个磁体附近提供返回磁通路径。

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