Electromagnetically driven oscillating mirror
AssigneeCarl-Zeiss-Stiftung
InventorsManfred Grupp, Horst Stacklies
Life of this patent
Estimating the term…
Abstract
An electromagnetic drive system drives the oscillating secondary mirror or wobble mirror of a reflecting telescope. The driving force of the drive system is directly proportional to the current and the drive system is digitally controllable. By incorporating a tachometer generator and a contactless operating position measuring unit, it is possible to select such function curves for the leading and trailing edges of the wobble function which will permit a jolt-free drive of the mirror.
Claims4
An electromagnetic drive system for a wobble mirror of a reflecting telescope, the wobble mirror being mounted for oscillatory movement with respect to a base and along a path in a predetermined direction about at least one rotational axis, the electromagnetic drive system comprising:
- a permanent magnet attached to said wobble mirror for moving back and forth along said path and for developing a magnetic field having an N-S polarity directed transversely to said path;
- a field coil assembly for coacting with said permanent magnet for driving said wobble mirror, the field coil assembly including:
- two magnetic iron cores fixedly mounted on said base and a arranged on respective sides of said path so as to be directly adjacent each other, said iron cores being shaped so as to be adapted to said path;
- two field coils mounted on respective ones of said iron cores;
- and current supply means for supplying current to said field coils for coacting with said field of said permanent magnet to generate a force for rotating said wobble mirror about said axis;
- control means for driving said field coil assembly;
- position measuring means for detecting the instantaneous actual position of said mirror and supplying a signal indicative of said position to said control means;
- and,
- tachometer-generator means for detecting the velocity of said mirror and supplying a signal indicative of said velocity to said control means.
An electromagnetic drive system for imparting oscillatory movement to a wobble mirror of a reflecting telescope, the system comprising:
- a base;
- rotational joint means for mounting said wobble mirror for rotational movement with respect to said base about at least one axis and along a path in a predetermined direction;
- a permanent magnet mounted on said wobble mirror for movement along said path and for developing a magnetic field having an N-S polarity directed transversely to said path;
- field coil means defining an air gap and being adapted to said path for accommodating said permanent magnet in said air gap;
- current supply means for supplying current to said field coil means for coacting with said field of said permanent magnet to generate a force for rotating said wobble mirror about said axis;
- control means for driving said field coil means;
- position measuring means for detecting the instantaneous actual position of said mirror and supplying a signal indicative of said position to said control means;
- and,
- tachometer-generator means for detecting the velocity of said mirror and supplying a signal indicative of said velocity to said control means.
Dependencies are inferred from the claim text.