Torsion Oscillator Driver with Dual Polarity Pulse Control
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Solution Overview
Problem
Torsion oscillators in bidirectional scanning and imaging devices face challenges in maintaining consistent scan path symmetry and stability due to imbalances, structural variances, and external disturbances, affecting the precision of imaging windows in devices like laser printers.
Innovation Solution
A system for driving torsion oscillators using frequency, amplitude, and offset control signals, where a pulse width modulator generates output pulses with controlled durations to drive the oscillator with alternating polarities, ensuring precise control over the oscillation and maintaining a constant imaging window time interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torsion oscillator is used in bidirectional scanning devices, then the scanning function is achieved, but the scan interval consistency and offset stability deteriorate due to imbalances and structural variances
Solution Approach 1:
The patent implements feedback control by sensing the light beam position at predetermined locations in the scan path and using this information to adjust drive parameters. Sensors detect the actual scan position, and the system modifies the drive voltage characteristics to maintain consistent scan intervals and stable offset despite mechanical imbalances and structural variances in the torsion oscillator.
Solution Approach 2:
The patent dynamically changes drive parameters including voltage amplitude, pulse width, and duty cycle to compensate for oscillator imbalances. By adjusting these electrical parameters in real-time based on feedback, the system maintains reliable scan interval consistency and offset stability without requiring perfect mechanical symmetry in the torsion oscillator.
2Measurement precision
If feedback control is implemented to stabilize scan parameters, then scan precision is improved, but system complexity increases
Solution Approach 1:
The patent uses sensors to detect light beam position and feeds this information back to the control system, which adjusts drive parameters to maintain precise scan positioning. This feedback mechanism improves measurement precision by continuously monitoring and correcting scan deviations while managing complexity through practical implementation choices.
Solution Approach 2:
The patent employs a multi-functional control system that simultaneously manages amplitude, frequency, and offset stabilization using integrated feedback processing. The control circuit performs multiple functions including sensing scan position, calculating required corrections, and generating adjusted drive signals, thereby improving precision while avoiding the need for separate dedicated systems for each control function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively stabilizes the torsion oscillator's motion, maintaining a consistent scan path and imaging window, even under disturbances, by employing feedback controllers to adjust pulse durations and polarities, thus enhancing the precision and reliability of bidirectional imaging.
Implementation Method 1
A pulse width modulator subsystem is provided for generating output pulses having controlled pulse durations alternately to each of two channels
Implementation Method 2
A driver circuit is provided for driving the torsion oscillator with a voltage of one polarity during a pulse output to the one of the two channels, and with a voltage of opposite polarity during a pulse output to the other of the two channels
Implementation Method 3
The mirror angle changes sinusoidally with respect to time at a certain amount of sweep or scan angle
Implementation Method 4
Torsion oscillators which include an oscillating mirror may be employed in bidirectional scanning and imaging devices
Implementation Method 5
feedback from sensors which sense the light beam at predetermined positions in the scan path
Data Source
AI summary
A system for driving a torsion based on frequency, amplitude and offset control signals includes a pulse width modulator subsystem configured to generate output pulses having controlled pulse durations alternately to each of two channels, the output pulses encoding the frequency, amplitude and offset control signals. A driver circuit is configured for driving the torsion oscillator with a voltage of one polarity during a pulse output to the one of the channels, and a voltage of opposite polarity during a pulse output to the other of the channels.