Digital control servo system
First Claim
1. A galvanometer optical scanning system comprising:
- a galvanometer scanner adapted for directing an energy beam to at least one location within a field of view;
a digital controlled servo system adapted for controlling motion of the galvanometer scanner in accordance with a servo command waveform said command waveform including at least a first portion and a second portion; and
a digital processor for providing a first set of closed-loop control parameters for use during the first portion of said command waveform in conformance with which said first portion of said command waveform will be employed to control motion of the galvanometer, and for providing a second set of closed-loop control parameters for use during the second portion of said command waveform in conformance with which said second portion of said command waveform will be employed to control motion of the galvanometer.
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Accused Products
Abstract
An improved servo system for galvanometers, scanners and similar devices which uses digital processing to increase the dynamic range and provide greater effective resolution. The system provides digital control of a reference point that directly influences the excitation, which in turn directly influences the gain of the circuit. A high and low resolution switching path is provided to optimize dynamic range. Wide angle torque compensation improves uniformity of response at large angular deflections from zero. Improved thermal protection allows safe operation near system thermal limits. A graphical user interface allows adjustments and changes response on the fly for tuning due to input conditions or user control.
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Citations
49 Claims
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1. A galvanometer optical scanning system comprising:
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a galvanometer scanner adapted for directing an energy beam to at least one location within a field of view; a digital controlled servo system adapted for controlling motion of the galvanometer scanner in accordance with a servo command waveform said command waveform including at least a first portion and a second portion; and a digital processor for providing a first set of closed-loop control parameters for use during the first portion of said command waveform in conformance with which said first portion of said command waveform will be employed to control motion of the galvanometer, and for providing a second set of closed-loop control parameters for use during the second portion of said command waveform in conformance with which said second portion of said command waveform will be employed to control motion of the galvanometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for laser marking using an optical scanning system including a servo controller, the method comprising the steps of:
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providing a first bandwidth closed-loop control parameter for use during a first scan period of a marking application; and providing a second bandwidth closed-loop control parameter for use during a second scan period of the marking application; wherein each bandwidth closed-loop control parameter includes servo closed-loop control parameters that can be adjusted using a graphical user interface, and the servo operates in accordance with a servo command waveform and execution of the servo command waveform in accordance with the first closed-loop control parameter during the first scan period and in accordance with the second closed-loop control parameter during the second scan period. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A laser marking system comprising:
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a galvanometer optical scanning subsystem including a digital controlled servo adapted for controlling a galvanometer scanner; and a means for defining a first bandwidth closed-loop control parameter for use during a first scan period of a marking application and for defining a second bandwidth closed-loop control parameter for use during a second scan period of the marking application; wherein each of said first and second bandwidth closed-loop control parameters can be adjusted using a graphical user interface, and the servo operates in accordance with a servo command waveform and the first bandwidth closed-loop control parameter during the first scan period and operates in accordance with the servo command waveform and the second bandwidth closed-loop control parameter during the second scan period. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification