Crossed Flexure Scanner Resonant Rotational Oscillator
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Solution Overview
Problem
Resonant rotational oscillators used in scanners often have slow operation and limited deflection angles, leading to inefficient scanning processes and increased costs.
Innovation Solution
A high-performance crossed flexure scanner architecture is designed to achieve high resonant frequencies and large angular oscillation amplitudes by optimizing the moment of inertia, spring design, and motor placement, using torsion bars and crossed flat springs to maximize the product of frequency and maximum deflection angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional resonant rotational oscillator design is used, then the structure is simple, but the scanning speed is slow and deflection angle is limited
Solution Approach 1:
The oscillator is divided into separate functional modules: a resonant scanner mechanism with crossed flexures, a独立的 motor assembly, and a mirror mounting system. This segmentation allows each component to be optimized independently for speed while managing overall complexity.
Solution Approach 2:
The patent employs dynamic resonance operation where the oscillator is driven at its natural resonant frequency to achieve high-speed scanning. The crossed flexure design provides dynamic flexibility that enables large deflection angles at resonant frequencies, transforming the system from static to dynamic operation.
2Speed
If resonant frequency is increased, then scanning speed improves, but deflection angle decreases
Solution Approach 1:
The patent utilizes mechanical vibration at resonant frequency to achieve high-speed scanning. The crossed flexure design is specifically engineered to resonate at frequencies that provide both high speed and adequate deflection angle, leveraging the natural vibration characteristics of the mechanical structure.
Solution Approach 2:
The patent optimizes physical parameters including flexure thickness, length, and material properties to tune the resonant frequency and deflection angle. By changing these parameters, the system achieves a balance where high resonant frequency coexists with sufficient angular oscillation amplitude for effective scanning.
3Force
If motor size is increased to provide more torque, then oscillation amplitude improves, but moment of inertia increases reducing resonant frequency
Solution Approach 1:
The patent replaces a traditional large motor with a smaller motor coupled to a gear train or belt drive system. This substitution provides the necessary torque through mechanical advantage while keeping the rotating mass (moment of inertia) low, thereby maintaining high resonant frequency.
Solution Approach 2:
A gear train or belt drive acts as an intermediary between the motor and the scanner mechanism. This intermediary transmits torque from a small motor to the larger scanner assembly, providing force multiplication without requiring the motor itself to have high moment of inertia.
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 optimized design achieves higher frequencies and larger deflection angles, enhancing scanner performance, manufacturability, and reliability, with a performance metric of greater than 12500 HzDegrees, while minimizing the moment of inertia and maintaining low stress in the spring system.
Implementation Method 1
using torsion bars and crossed flat springs to maximize the product of frequency and maximum deflection angle
Implementation Method 2
A method and apparatus for resonant rotational oscillator... simultaneously achieves high resonant frequency and large angular oscillation amplitude
Implementation Method 3
a motor means to drive the oscillation
Data Source
AI summary
A method and apparatus for resonant rotational oscillator have been disclosed. In one version a moving coil is mounted on a rotating member. By using a magnetic assembly and the moving coil the rotating member is made to rotate.