Vibrating Actuator Assembly for Lens Positioning
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Solution Overview
Problem
Conventional optical systems with piezoelectric devices for lens movement suffer from complex structures, high power consumption, noise, vibration, and inaccurate position control due to the use of gears and cams, which increase volume and generate stepping errors.
Innovation Solution
A vibrating actuator assembly that includes a diaphragm, a vibrator, a vibration shaft, a rotor, and an elastic presser, where the diaphragm vibrates when an electric signal is applied, transferring vibration to the rotor for precise position control through a compact structure, reducing noise and vibration by eliminating the need for complex mechanical elements like gears and cams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If gears and cams are used to convert rotation to rectilinear motion, then driving power is generated, but device complexity and volume increase
Solution Approach 1:
The patent extracts and eliminates the complex mechanical transmission elements (gears and cams) from the system. Instead of using traditional mechanical conversion mechanisms, the invention directly couples the piezoelectric actuator to the lens through a simplified support structure, removing unnecessary components while maintaining the essential function of converting motor rotation to lens movement.
Solution Approach 2:
The patent replaces the mechanical gear-cam system with a direct mechanical coupling approach. The piezoelectric actuator's rod directly pushes or pulls the lens support, eliminating the need for mechanical transmission elements. This substitution simplifies the structure while preserving the driving power function.
2Power
If gears and cams are used for motion conversion, then driving power is achieved, but volume increases
Solution Approach 1:
By extracting the bulky gear and cam mechanisms from the system, the patent achieves compact dimensions. The direct coupling of the piezoelectric actuator to the lens support eliminates the space required for complex transmission mechanisms, resulting in a more compact overall device volume.
Solution Approach 2:
The patent merges the functions of multiple components into a simplified structure. The support structure directly performs both the guidance and power transmission functions that were previously separated into distinct gear and cam components, reducing the overall volume required for these functions.
3Measurement precision
If stepping motor with reduction gear is used, then position control is achieved, but stepping errors occur
Solution Approach 1:
The patent removes the reduction gear mechanism that causes stepping errors. By using a direct drive approach with the piezoelectric actuator, the system eliminates the intermediate transmission stages where positioning errors accumulate, achieving more accurate and reliable lens positioning.
Solution Approach 2:
The patent replaces the stepping motor with reduction gear system with a piezoelectric actuator that provides direct mechanical coupling. This substitution eliminates the backlash and stepping errors inherent in gear-based systems, improving position accuracy and reliability.
4Speed
If conventional piezoelectric device with gears is used, then lens movement is achieved, but structure becomes complex
Solution Approach 1:
The patent extracts the gear and cam components from the piezoelectric lens drive system, retaining only the essential elements needed for lens movement. The simplified structure maintains the ability to move lenses for zooming and focusing while eliminating the complexity of mechanical transmission mechanisms.
Solution Approach 2:
The patent combines the guidance and actuation functions into an integrated support structure. The support structure directly guides the lens while being actuated by the piezoelectric device, merging multiple functions into a single simplified component rather than using separate mechanisms for each function.
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 enables strong driving power with precise position control and reduced noise and vibration, achieving a simpler structure that minimizes errors between components, allowing for compact design and improved performance in optical systems.
Implementation Method 1
at least one vibrator at the diaphragm and that vibrates when an electric signal is applied thereto
Implementation Method 2
an elastic presser at another end of the vibration shaft and that elastically presses the rotor toward the diaphragm
Implementation Method 3
a moving unit that contacts an outer surface of the rotor and moves along the rotor according to a frictional force generated between the rotor and the moving unit
Data Source
AI summary
A vibrating actuator assembly includes a diaphragm, at least one vibrator at the diaphragm and that vibrates when an electric signal is applied thereto, a vibration shaft having one end connected to the diaphragm, a rotor on an outer side of the vibration shaft to contact an outer surface of the vibration shaft and that moves by vibration of the vibration shaft, and an elastic presser at another end of the vibration shaft and that elastically presses the rotor toward the diaphragm.