Adaptive resonant positioner having random access capability
OwnerJames G. Tisueinventor
Life of this patent
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Abstract
A positioning system including a sensor 52, a drive control 54 and an actuator 56. Sensor 52 senses a mirror 64 position and provides actual position signals to drive controller 54, which responsively adapts and applies drive currents to actuator 56. The actuator positions the mirror to reflect an optical beam 38 as desired. Preprogrammed sequences of mirror stopping positions can be synchronized with a laser 58 to tune pulses at very high rates and peak power.
Claims20
An adaptive resonant positioner means responsive to an actual position of a resonant armature and operative to adaptively learn and provide drive control information for driving an actuator means to position said resonant armature, comprising:
- sensing means for generating a resonant armature actual position signal;
- electronic data storage means for receiving and storing desired position information defining a pattern of desired positions to be sequentially occupied by said resonant armature, and also for receiving and storing drive control information defining a set of drive forces for sequentially moving, in substantially sinusoidal segments of the resonant armature motion, said resonant armature to stop at the desired positions;
- drive force current amplifier means for amplifying the drive control information to produce a drive force current on an output line;
- and
- error determining means responsive to said desired position information and to said actual position signal for determining differences between desired and actual positions of said resonant armature at a plurality of times related to a resonant frequency, and correction calculating means responsive to said differences for calculating corrected drive control information and storing the corrected information in said storage means, whereby the corrected information is available for use in a subsequent pattern in causing said actuator means to reposition said resonant armature to stop closer to successive ones of said desired positions.
A method of adaptively actuating a resonant armature means to cause the armature means to stop at desired positions in a sequence, comprising the steps of:
- providing drive control information for driving said armature means in substantially sinusoidal segments of the resonant armature motion through the sequence of desired positions;
- converting said drive control information into a plurality of drive forces;
- sequentially applying said drive forces to said armature means at a plurality of times related to a resonant armature resonant frequency;
- sensing an actual position of said armature means in response to application of each said drive force;
- comparing each said actual position to a corresponding desired position for said armature means;
- correcting said drive control information to enable later moving said armature means through a sequence of actual positions closer to said desired position;
- and
- compensating drive control information for a respective immediately succeeding desired position to later move said armature means from each corrected actual position towards a same succeeding desired position.
Dependencies are inferred from the claim text.