Servo system responsive to temperature changes

A method for operating a servo system in a region of ambient temperature, said system including a first member, a second member that is positionable relative to said first member, a control loop comprising circuitry for producing a broadband frequency signal coupled to said second member that causes said second member to be positioned to a desired location relative to said first member, said second member having a natural resonant frequency f that varies with temperature within a frequency range between f1 and f2, said method comprising the steps of:

• measuring said ambient temperature and providing an output signal indicative thereof;
• and
• responding to said output signal by attenuating in said broadband signal only a narrow band of frequencies that lie within said frequency range f1-f2, where f1<f2, said narrow band including said frequency f.

A method for controlling a disk servo system, said system including a disk for storing information content in tracks, a transducer structure positionable over any one of said tracks for reading said information content therefrom, said transducer structure having a natural frequency f which varies as a function of temperature of said transducer structure within a range between f1 and f2, a temperature sensor producing a signal representing the temperature of said transducer structure, and a control loop comprising circuitry coupled to said transducer structure for producing a broadband signal for application to said transducer structure to control movement thereof, said method comprising the steps of:

• a) determining through use of said temperature signal a value of said natural frequency for said transducer structure;
• and
• b) attenuating in said broadband frequency signal only a narrow band of frequencies that lie within said frequency range f1-f2, where f1<f2, said narrow band including said frequency f.

A memory media for operating a controller of a servo system in a region of ambient temperature, said system including a first member, a second member that is positionable relative to said first member, a control loop comprising circuitry for producing a broadband frequency signal coupled to said second member that causes said second member to be positioned to a desired location relative to said first member, said second member having a natural resonant frequency f that varies with temperature within a frequency range between f1 and f2, said memory media comprising:

• means for operating said controller to detect an ambient temperature signal;
• and
• means for operating said controller to respond to said ambient temperature signal by setting a filter to attenuate in said broadband signal only a narrow band of frequencies that lie within said frequency range f1-f2, where f1<f2 said narrow band including said frequency f.

A memory media operating a controller of a disk servo system, said system including a disk for storing information content in tracks, a transducer structure positionable over any one of said tracks for reading said information content therefrom, said transducer structure having a natural frequency f which varies as a function of temperature of said transducer structure within a range between f1 and f2, a temperature sensor producing a signal representing the temperature of said transducer structure, and a control loop comprising circuitry coupled to said transducer structure for producing a broadband signal for application to said transducer structure to control movement thereof, said memory media comprising:

• a) means for operating said controller to determine through use of said temperature signal a value of said natural frequency for said transducer structure;
• and
• b) means for operating said controller to attenuate in said broadband frequency signal only a narrow band of frequencies that lie within said frequency range f1-f2, where f1<f2, said narrow band including said frequency f.