Lens Holder Buffer Layer for Vibration Stress Relief
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Solution Overview
Problem
Existing vibration devices used in imaging systems, such as cameras, face damage due to stress applied during vibration, which can lead to reduced reliability over time.
Innovation Solution
A vibration device design featuring a cylindrical body with a buffer layer between the cylindrical body and the piezoelectric element, where the buffer layer has a thicker inner end portion than outer end portion, reducing stress on the bonding interface and preventing damage during vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piezoelectric element is used to vibrate the lens holder for removing water droplets, then the water droplet removal function is improved, but the lens holder may be damaged by continuous stress during vibration
Solution Approach 1:
A buffer layer is introduced as an intermediary component between the piezoelectric element and the lens holder. This buffer layer absorbs and distributes the stress generated during vibration, preventing direct transmission of harmful forces to the lens holder while maintaining the effectiveness of the water droplet removal function.
Solution Approach 2:
The buffer layer is positioned in advance between the piezoelectric element and lens holder to provide protective cushioning before damage can occur. This preventive measure ensures that stress is mitigated during vibration cycles, extending the durability of the lens holder without compromising the vibration-based water droplet removal capability.
2Productivity
If stress is applied to the lens holder during vibration to remove water droplets, then the cleaning effect is improved, but the lens holder may be damaged over time
Solution Approach 1:
The buffer layer serves as a mediator that allows effective stress application for water droplet removal while protecting the lens holder from damage. It transmits necessary vibrational forces to achieve cleaning productivity while filtering out harmful stress concentrations that would reduce reliability.
Solution Approach 2:
The buffer layer modifies the stress distribution parameters by distributing concentrated forces from the piezoelectric element across a broader area of the lens holder. This parameter change maintains the effectiveness of water droplet removal while reducing peak stresses that would compromise long-term reliability.
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 design effectively reduces stress on the bonding interface, preventing damage and improving the reliability of the vibration device while maintaining or increasing the displacement of the light-transmissive cover.
Implementation Method 1
a piezoelectric body directly or indirectly bonded to the cylindrical body
Implementation Method 2
a buffer layer between at least one of the cylindrical body and the piezoelectric body and the cylindrical body and the light-transmissive cover, in which when a direction connecting the first opening end surface and the second opening end surface of the cylindrical body is defined as an axial direction, the buffer layer includes an inner end portion on an inner side portion in a direction orthogonal or substantially orthogonal to the axial direction and an outer end portion on an outer side portion in a direction orthogonal or substantially orthogonal to the axial direction, and a thickness of the inner end portion is larger than a thickness of the outer end portion
Data Source
AI summary
A vibration device includes a cylindrical body including a cavity, a first opening end surface, and a second opening end surface, a light-transmissive cover directly or indirectly bonded to the first opening end surface of the cylindrical body so as to cover the cavity of the cylindrical body, a piezoelectric body directly or indirectly bonded to the cylindrical body, and a buffer layer provided between at least one of the cylindrical body and the piezoelectric body, and the cylindrical body and the light-transmissive cover. The buffer layer includes an inner end portion on an inner side portion in a direction orthogonal or substantially orthogonal to the axial direction and an outer end portion on an outer side portion in a direction orthogonal or substantially orthogonal to the axial direction. A thickness of the inner end portion is larger than a thickness of the outer end portion.