Ultrasonic Lens Drive Structure for Stable Thrust Transmission
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Solution Overview
Problem
Ultrasonic-motor type driving units in camera modules experience instability due to varying positional relationships between active and passive elements during contact, affecting the driving performance.
Innovation Solution
A driving unit incorporating a piezoelectric element and resonant portion, with a contacting part biased towards the resonant portion to stabilize the thrust transmission to a movable part, enhancing the ultrasonic motor's stability by using a supporting portion and biasing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the positional relationship between the active element and passive element is displaced, then the contact position between elements varies, but the driving performance stability deteriorates
Solution Approach 1:
The contacting part is designed to move dynamically in accordance with the resonance of the resonant portion, allowing the contact position to vary while maintaining stable driving performance. The biasing portion enables the contacting part to flexibly adjust its position while ensuring consistent thrust transmission.
Solution Approach 2:
The invention changes the physical state of the contacting part by introducing a biasing mechanism that allows it to move in accordance with resonance. This parameter change enables the contact position to vary dynamically while maintaining stable driving performance through the resonant vibration.
2Reliability
If the contacting part is made to move in accordance with resonance, then the thrust transmission is stabilized, but the device complexity increases
Solution Approach 1:
The biasing portion is integrated with the supporting portion to form a unified structure that provides both support and biasing functions. This merging reduces the number of separate components while achieving the desired thrust transmission stability.
Solution Approach 2:
The supporting portion serves multiple functions: it supports the contacting part, provides the biasing force through the integrated biasing portion, and transmits the thrust to the movable part. This multi-functionality reduces overall device complexity while maintaining performance.
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 improves the stability of the ultrasonic motor's driving performance by ensuring consistent thrust transmission and reducing positional displacement issues between active and passive elements.
Implementation Method 1
an ultrasonic motor that includes a piezoelectric element and a resonant portion and is configured to convert a vibration of the piezoelectric element into a linear motion, the piezoelectric element generating the vibration
Implementation Method 2
the resonant portion resonating with the vibration of the piezoelectric element; the contacting part moves in accordance with resonance of the resonant portion and transmits the thrust to the movable part
Data Source
AI summary
This drive unit comprises: an ultrasonic motor that converts the oscillation of a piezoelectric element to linear movement; a contact part that contacts a resonating part; a support part that is connected to a moveable part and supports the contact part; and an impelling part which is coupled to the contact part and which impels the contact part toward the resonating part so that the contact part moves in accordance with the resonance of the resonating part and transmits impelling force to the moveable part via the support part.