Reflector Drive Control for Uniform Optical Scanning
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Solution Overview
Problem
Existing movable devices with reflectors face challenges in achieving uniform scanning motion due to fluctuations in deflection angles caused by elastic vibrations, leading to non-uniform image quality and brightness.
Innovation Solution
A control system that includes a movable device with paired movable portions and a detector to detect deflection angles, generating drive signals based on the symmetry and phase difference of the drive signals, extracting high-frequency components, and updating signals to maintain a constant deflection angle and uniform scanning motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the reflector is tilted by paired movable portions to enable optical scanning, then the optical deflection function is achieved, but high-frequency components from elastic vibrations cause nonuniformity in brightness and image distortion
Solution Approach 1:
The system uses a detector to detect the deflection angle of the reflector and feeds back this information to the control circuitry. The control circuitry then adjusts the drive signals based on this feedback to minimize high-frequency components and maintain constant moving speed, thereby resolving the contradiction between achieving optical scanning and maintaining image uniformity
Solution Approach 2:
The system changes the parameters of the drive signals (symmetry ratio and phase difference) to optimize the reflector's motion. By adjusting these parameters based on detected deflection angles, the system minimizes elastic vibrations and maintains constant moving speed, improving image uniformity while preserving scanning function
2Ease of operation
If drive signals are generated with specific symmetry and phase difference to control reflector motion, then optical scanning is achieved, but elastic vibrations produce high-frequency components that degrade image quality
Solution Approach 1:
The detector monitors the reflector's deflection angle and provides feedback to the control circuitry, which adjusts the drive signals in real-time to minimize high-frequency components generated during tilting operation
Solution Approach 2:
The system detects the high-frequency components generated by elastic vibrations and uses this information to adjust the drive signals, converting the harmful vibrations into controllable parameters that can be optimized to minimize image degradation
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 enhances the uniformity of scanning motion, reducing non-uniformity in brightness and improving image quality by controlling the high-frequency components associated with elastic vibrations.
Implementation Method 1
a detector to detect deflection angle of the reflector tilted by the paired movable portions
Implementation Method 2
paired movable portions to tilt the reflector; output drive signals to the paired movable portions, respectively, to cause the paired movable portions to individually tilt the reflector
Implementation Method 3
The movable device deflects the light emitted from the light source to form an image
Data Source
AI summary
A control system includes a movable device, memory, and circuitry. The movable device includes a reflector; paired movable portion; and a detector to detect deflection angle of the reflector. The circuitry outputs drive signals to the paired movable portions, respectively; generates the drive signals based on variables of a symmetry of each of the drive signals and a phase difference between the drive signals; detects, from the movable device, the deflection angle of the reflector by the detector; extract an amplitude of a high-frequency component from a detection signal; store, in the memory, information in which the amplitude of the high-frequency component is associated with values of the variables of the drive signals; select a combination of the values of the variables based on the high-frequency component and the information stored in the memory; and update the drive signals based on the combination of the values of the variables selected.