Light Deflection Device Counter Swing Member Vibration Suppression
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Solution Overview
Problem
The existing light deflecting devices face issues with vibration transmission to the fixed unit, leading to noise generation in the housing due to close resonance frequencies between the light deflecting unit and the fixed unit, which existing technologies fail to adequately suppress.
Innovation Solution
A light deflecting device with a counter swing member that operates in reverse phases to the light deflecting unit, offsetting the exciting forces acting on the fixed unit, and utilizing a mass regulating unit to stabilize resonance frequencies, ensuring efficient vibration suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light deflecting unit is swingably fixed to the fixed unit through beams, then the light deflecting device achieves compact structure and simple manufacturing, but vibration is transmitted to the housing causing noise
Solution Approach 1:
The patent introduces a counter swing member with counter weight that oscillates in opposite phase to the light deflecting unit. This counter weight generates counteracting vibrations that cancel out the vibrations transmitted to the fixed unit and housing, thereby suppressing noise while maintaining the compact beam-supported structure
Solution Approach 2:
The patent utilizes mechanical vibration principles by introducing a counter swing member that oscillates at the same frequency but in opposite phase to the light deflecting unit. This creates destructive interference of vibrations, canceling out the harmful vibrations transmitted to the housing and reducing noise
2Measurement precision
If the light deflecting unit oscillates at resonance frequency, then positioning precision is improved, but vibration transmission to the housing increases causing noise
Solution Approach 1:
The counter swing member with counter weight is designed to oscillate in opposite phase to the light deflecting unit during resonant operation. This counteracts the vibration transmission to the housing, allowing the system to operate at resonance frequency for high positioning precision without generating excessive noise
Solution Approach 2:
The patent converts the harmful vibration energy generated during resonant operation into a beneficial effect by using the counter swing member to generate counteracting vibrations. The vibration that would normally cause noise is instead used to drive the counter swing member, which then cancels out the harmful vibrations transmitted to the housing
3Reliability
If temperature fluctuates, then resonance frequency changes affecting controllability, but the patent maintains stable amplitude control
Solution Approach 1:
The patent employs feedback control mechanisms that monitor the oscillation amplitude and adjust the driving force accordingly. This feedback system compensates for resonance frequency shifts caused by temperature fluctuations, maintaining stable amplitude control and reliable operation across varying temperature conditions
Solution Approach 2:
The patent adjusts operating parameters such as driving frequency and amplitude in response to temperature changes. By dynamically changing these parameters, the system compensates for resonance frequency drift and maintains stable controllability despite temperature fluctuations
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 solution effectively prevents noise generation by offsetting vibrations and maintaining stable amplitude control despite temperature fluctuations, enhancing the controllability and reducing noise in the housing.
Implementation Method 1
an electromagnetic force generated by a current flowing to the coil and a magnetic field formed by the magnetic field forming unit
Implementation Method 2
the light deflecting unit is swingably fixed to the fixed unit having the magnetic field forming unit through the beams, and serving to swing the movable unit with the beams set as torsional rotation axes
Implementation Method 3
A light deflecting device with a counter swing member that operates in reverse phases to the light deflecting unit, offsetting the exciting forces acting on the fixed unit
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
Provided is a light deflecting device which suppresses a vibration caused by swing of a light deflecting unit and transmitted to a fixed unit and prevents a noise from being made on a housing to which the fixed unit is attached. A light deflecting device includes a light deflecting unit 5 having paired beams 4 provided on both sides of a movable unit 3 having a light reflecting unit and a coil, and a fixed unit to which the light deflecting unit 5 is swingably fixed through the beams 4 and which includes a magnetic field forming unit, swings the movable unit 3 with the beams 4 as torsional rotation axes by an electromagnetic force generated by a driving current flowing to the coil and a magnetic field formed by the magnetic field forming unit, and a counter swing member 15 to be swung in a reverse phase to a swing phase of the light deflecting unit 5 is provided in the fixed unit 2 so as to be opposed to the light deflecting unit 5.