公开(公告)号：US5195074A

公开(公告)日：1993-03-16

申请号：US740379

申请日：1991-08-05

申请人： Katsushide Tanoshima ,  Minoru Ohtsuka ,  Shizuo Nagata ,  Masahiro Takahashi ,  Yasuo Shimizu

发明人： Katsushide Tanoshima ,  Minoru Ohtsuka ,  Shizuo Nagata ,  Masahiro Takahashi ,  Yasuo Shimizu

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/12

CPC分类号： G11B7/12 ,  G11B7/08582 ,  G11B7/09

摘要： In an optical head apparatus for recording or reproducing information onto or from an optical disc, a carriage is movable along a guide shaft extending in a direction parallel with the radial direction of the optical disc, and an armature is mounted on the carriage so that it can rotate about a pivotal axis perpendicular to the surface of the optical disc. An objective lens is fixed to the armature and positioned to traverse the tracks on the optical disc when the armature rotates. Guide yokes extend in parallel with the guide shaft. Tracking and carriage-servo coils are fixed to the armature and have a hollow through which the guide yokes loosely extend. A magnetic field means creates magnetic lines of force perpendicular to the longitudinal direction of the guide yokes and parallel with the surface of the optical disc. A drive circuit supplies currents to the tracking and carriage-servo coils in such directions as to produce electromagnetic forces in parallel with each other thereby driving the armature along the guide yokes or in such directions as to produce electromagnetic forces in antiparallel with each other to rotate the armature about the pivotal axis.

摘要翻译： 在用于在光盘上记录或再现信息的光学头装置中，滑架可沿着与光盘的径向平行的方向延伸的引导轴移动，并且电枢安装在滑架上，使得它 可围绕垂直于光盘表面的枢转轴旋转。 当电枢旋转时，物镜固定到电枢并定位成横过光盘上的轨道。 引导轭与引导轴平行延伸。 跟踪和托架伺服线圈固定在电枢上，并具有中空的引导线松动地延伸通过该中空。 磁场意味着产生垂直于引导轭的纵向方向的磁力线并与光盘的表面平行。 驱动电路将电流提供给跟踪和托架伺服线圈，以便产生彼此平行的电磁力，从而沿着引导轭驱动电枢，或沿着这样的方向驱动电枢，以产生彼此反平行的电磁力，以使其旋转 电枢围绕枢转轴线。