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DVD:The tracking and focus two-axis device

Posted on September 1, 2015 by admin Leave a comment

The tracking and focus two-axis device The objective lens is contained inside two separate coils: one for focus and the other for tracking control, placed at right angles to each other. The coils are placed inside a magnetic field produced by a permanent magnet as shown in Figure 20.17. This assembly, known as a ,u2-axis […]
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