|A differentiation changes the position into the velocity. And it goes just
If you choose "Step-Res", you can see how the pickup follows the "step" displacement. You see it has become faster!!
You may implement a focus servo having a function (Alpha+BetaS) to feedback the position. "Alpha" affect the spring constant and "Beta" does the oppressiveness. Both of them are independent each other!! The basis of feedback control is to support some mechanical factor by some artificial ways as we introduced above.
Actual servo implementation is more complicated than this class. For more useful technique, please wait until we make new classes!!
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