Patent ID: 6188191
Filing Date: 2001-02-13
Classification: G11B

Abstract:
A servo system for operating in a region of ambient temperature, said system comprising:a first member;a second member positionable relative to said first member;a control loop comprising circuitry for producing a broadband frequency signal coupled to said second member, for further causing said second member to be positioned to a desired location relative to said first member;said second member having a natural resonant frequency f, which is a function of said ambient temperature and varies between f1 and f2 with temperature, where f1<f2;said servo system including means for measuring said ambient temperature and providing an output signal indicative thereof; andsaid control loop including means responsive to said output signal for attenuating in said broadband frequency signal only a narrow band of frequencies that lie within said frequency range f1-f2, said narrow band including said frequency f.