Piezo Lens Vibration Device Bending Mode Water Removal
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Solution Overview
Problem
Existing vibration devices for camera lenses, such as those using piezoelectric vibrators and ultrasonic transducers, face challenges in achieving large amplitude vibrations without separating at joint interfaces, which can lead to ineffective removal of water droplets from the lens surface.
Innovation Solution
A vibration device with a cylindrical vibration body and a light-transparent body portion that vibrates in a bending mode, utilizing a piezoelectric vibrator to displace the cylindrical member in the Z direction, and alternating between first and second bending modes to ensure nodes of vibration are within the joint interface, thereby increasing amplitude and reducing separation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large vibration amplitude is generated in the piezoelectric vibrator to remove water droplets, then water droplet removal effectiveness is improved, but separation at the joint interface between the light-transparent body portion and cylindrical member occurs
Solution Approach 1:
The patent applies local quality by creating a thinned-wall portion at a specific location (first end portion) of the cylindrical member, while maintaining normal wall thickness at other portions. This localized structural modification allows the thinned-wall portion to vibrate with larger amplitude for effective water droplet removal, while other portions maintain structural integrity to prevent joint interface separation.
Solution Approach 2:
The patent utilizes dynamics by operating the piezoelectric vibrator at resonant frequencies that excite bending modes in the light-transparent body portion. By carefully selecting vibration modes where nodes occur at the joint interface, the system achieves large amplitude vibration for water droplet removal while the nodal points provide natural stabilization at the joint interface, preventing separation.
2Speed
If the light-transparent body portion is made thinner to reduce weight and improve vibration response, then vibration amplitude is improved, but strength and resistance to separation are reduced
Solution Approach 1:
The patent applies local quality by creating a thinned-wall portion at a specific location (first end portion) of the cylindrical member, while maintaining normal wall thickness at other portions. This localized structural modification allows the thinned-wall portion to vibrate with larger amplitude for effective water droplet removal, while other portions maintain structural integrity to prevent joint interface separation.
Solution Approach 2:
The patent applies segmentation by dividing the cylindrical member into portions with different wall thicknesses - a thinned-wall portion at the first end and a normal-thickness portion at the second end. This segmentation allows different regions to serve different functions: the thinned portion for vibration and the thicker portion for structural support and joint stability.
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 separation at joint interfaces, allowing for larger amplitude vibrations and certain removal of water droplets from the lens surface, ensuring clear field of view even in rainy conditions.
Implementation Method 1
a piezoelectric vibrator, and a light-transparent body portion... The light-transparent body portion is structured to vibrate in a bending mode by vibration of the cylindrical vibration body portion
Implementation Method 2
The light-transparent body portion is structured to vibrate in a bending mode by vibration of the cylindrical vibration body portion. The bending mode includes a first mode in which a center portion of the light-transparent body portion that is displaced to the largest extent when the light-transparent body portion vibrates in the bending mode and the outer peripheral portion of the light-transparent body portion that is connected to the end surface are displaced in the same or substantially the same direction
Data Source
AI summary
A vibration device includes a cylindrical vibration body portion including a cylindrical member and a piezoelectric vibrator fixed to the cylindrical member, and a light-transparent body portion that includes an outer peripheral portion connected to an end surface of the cylindrical member and a light-transparent portion positioned in front of a lens. The light-transparent body portion vibrates in a bending mode by vibration of the cylindrical vibration body portion. The bending mode includes a first bending mode in which a center-maximum-displacement portion of the light-transparent body portion and the outer peripheral portion of the light-transparent body portion connected to the end surface are displaced in the same direction and a second bending mode in which the center-maximum-displacement portion of the light-transparent body portion and the outer peripheral portion of the light-transparent body portion are displaced in opposite directions.