Multiharmonic Oscillator for Linear Laser Scanning
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Solution Overview
Problem
Existing scanning mechanisms in electronic printers face challenges in achieving linear motion of a light beam due to intrinsic non-linear motion of mirror surfaces and changing distances, which complicates the design and compromises other performance factors like spot size and uniformity.
Innovation Solution
A multiharmonic oscillator with connected oscillating sections, each with a resonant frequency, is used to control the light beam's motion, allowing for independent shaping of the scan pattern through drive electronics that move the sections according to a mathematical series function, enabling the light beam to scan the imaging surface with a desired motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If compensating lenses or reflectors are used to achieve linearity in the scanning motion, then the scanning motion becomes linear, but the design complexity increases and other performance factors such as spot size and uniformity are compromised
Solution Approach 1:
The patent extracts the linearity compensation function from the optical system (lenses/reflectors) and relocates it to the mechanical drive system. By using a multiharmonic oscillator driven at multiple resonant frequencies, the scan pattern is shaped independently of optical elements, eliminating the need for compensating lenses while maintaining linear scanning motion.
Solution Approach 2:
The patent replaces optical compensation mechanisms (lenses and reflectors) with a mechanical solution. The multiharmonic oscillator uses multiple oscillating sections driven at different resonant frequencies to create the desired linear scan pattern mechanically, substituting the optical path manipulation with direct mechanical motion control.
2Manufacturing precision
If compensating lenses or reflectors are used to achieve linearity in the scanning motion, then the scanning motion becomes linear, but the spot size and uniformity performance is compromised
Solution Approach 1:
The patent segments the oscillating system into multiple independent oscillating sections, each capable of being driven at its own resonant frequency. This segmentation allows the scan pattern to be shaped by the combined motion of individual sections, enabling independent optimization of linearity and spot uniformity without compromise.
Solution Approach 2:
The patent changes the drive parameters by simultaneously exciting multiple resonant frequencies in the oscillating sections. By adjusting the amplitude and phase of each harmonic component, the system can independently control the scan pattern linearity and the spot characteristics, achieving both goals without the trade-off imposed by single-frequency driving.
3Device complexity
If a single resonant frequency is used to drive the oscillating section, then the system is simple, but the scan pattern cannot be independently shaped from the optical elements
Solution Approach 1:
The patent introduces dynamic multi-frequency driving to the oscillating sections. Instead of a single fixed frequency, the system dynamically combines multiple resonant frequencies with adjustable amplitudes and phases, enabling real-time shaping of the scan pattern while maintaining the simplicity of resonant-driven oscillation.
Solution Approach 2:
The patent exploits mechanical vibration at multiple resonant frequencies simultaneously. Each oscillating section vibrates at its natural resonant frequency, and the combination of these vibrations creates the desired complex scan pattern. This approach maintains the simplicity of resonant vibration while achieving versatile scan pattern shaping through multi-frequency excitation.
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
This approach allows for efficient and linear scanning motion, increasing scan efficiency, reducing system size, and eliminating the need for compensating lenses, thereby enhancing print speed and spot uniformity while maintaining performance goals.
Implementation Method 1
Each oscillating section has a resonant frequency, and at least one oscillating section comprises a reflector positioned to intercept the light beam and reflect the light beam from the reflector as a scan pattern. Drive electronics are configured to move at least one oscillating section at substantially the at least one oscillating section's resonant frequency
Implementation Method 2
at least one oscillating section comprises a reflector positioned to intercept the light beam and reflect the light beam from the reflector as a scan pattern
Data Source
AI summary
A scanning apparatus for a printer or similar instrument. A multiharmonic oscillator is used to provide a composite motion of a laser beam or other light beam to scan an imaging surface. The multiharmonic oscillator may have multiple sections each having a different resonant frequency. One section includes a reflector that intercepts the light beam, and drive electronics move the reflector so the light beam scans the imaging surface. Linear and complex non-linear motions of the light beam may be achieved. Microelectromechanical systems (MEMS) technology may be used to fabricate the oscillator.