Gyro Sensor Damping via Non-Woven Fabric in Lens Apparatus
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Solution Overview
Problem
Existing interchangeable lens systems with image stabilizers face malfunctions due to vibration interference between gyro sensors and vibration wave motors, particularly at low temperatures where materials with viscoelasticity, such as rubber or urethane, lose damping performance and fail to adequately suppress vibration transmission.
Innovation Solution
A lens apparatus incorporating a gyro sensor mounted on a flexible printed substrate, with a non-woven fabric made of randomly intertwined polyester and polyurethane fibers acting as a damping medium, and optionally a mass addition member to enhance damping, effectively reducing vibration transmission to the gyro sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a material having viscoelasticity (rubber or urethane) is used to hold the gyro sensor, then vibration transmission from the vibration wave motor to the gyro sensor is suppressed, but the damping performance deteriorates in low temperature environments
Solution Approach 1:
The invention changes the material parameter from viscoelastic materials (rubber, urethane) to fiber materials with high internal friction. This parameter change maintains effective damping performance across various temperature environments, including low temperature conditions where conventional viscoelastic materials fail.
Solution Approach 2:
The invention uses a fiber material that replicates the vibration suppression function of viscoelastic materials but with superior temperature stability. The fiber material copying the damping function through a different physical mechanism (internal friction) achieves reliable performance across temperature ranges.
2Device complexity
If the gyro sensor is installed directly on the lens barrel, then the structure is simple, but vibration from the vibration wave motor interferes with the gyro sensor detection
Solution Approach 1:
The invention introduces a fiber material as an intermediary between the lens barrel and the gyro sensor. This intermediary material absorbs vibration energy through internal friction, preventing vibration transmission to the gyro sensor while maintaining a relatively simple mounting structure.
Solution Approach 2:
The fiber material is placed beforehand between the vibration source and the gyro sensor to provide vibration cushioning. This prior cushioning prevents vibration interference before it reaches the sensitive detection element.
3Loss of energy
If conventional materials like rubber or urethane are used for vibration damping, then the damping effect is good at room temperature, but the material becomes hard and damping performance deteriorates at low temperatures
Solution Approach 1:
The invention changes the material parameter from viscoelastic materials to fiber materials with high internal friction characteristics. This parameter change results in a material that maintains consistent damping performance across temperature variations, unlike conventional materials that harden at low temperatures.
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 non-woven fabric maintains effective damping performance across various temperature environments, significantly reducing vibration transmission and preventing gyro sensor malfunctions, outperforming conventional materials like rubber and urethane.
Implementation Method 1
a fiber assembly via which the holder holds the detector... significantly reducing vibration transmission
Data Source
AI summary
A lens apparatus includes a detector configured to detect a camera shake, a correction unit configured to correct an image shake caused by the camera shake based on the detected camera shake, a driving device configured to move the correction unit, a holder holding the detector, and a fiber assembly via which the holder holds the detector.