Image Blur Correction Mechanism with Sheet Metal Rolling Surfaces
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Solution Overview
Problem
Existing image blur correction devices using resin for the movable member lack sufficient strength and are prone to thermal stress and deformation due to temperature changes, affecting the reliability and performance of the image capture device.
Innovation Solution
The device integrates a sheet metal member with a resin part to form the movable member, ensuring strong rolling surfaces and reducing thermal stress by using a resin part with a linear expansion coefficient closer to that of the image capture device, and utilizing magnetic attraction for urging, thereby enhancing the movable member's strength and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the movable member is formed of resin, then the ease of manufacture is improved, but the strength is insufficient
Solution Approach 1:
The movable member is constructed as a composite structure combining a resin base material with a sheet metal member having a rolling surface. This composite design allows the resin to provide ease of manufacture and damping properties while the sheet metal member provides the necessary strength and durability for the rolling surface that contacts the rolling member during image blur correction operations.
2Manufacturing precision
If the rolling surfaces are formed by affixing a roll reception member, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The sheet metal member having the rolling surface is integrated with the movable member as a unified structure. The rolling surface is formed directly on the sheet metal member that is attached to the movable member, eliminating the need for separate roll reception members and reducing assembly steps while maintaining the precision required for proper rolling member contact.
3Ease of manufacture
If the movable member is molded integrally with a ball receiving sheet metal, then the ease of manufacture is improved, but the strength of the movable member is not ensured
Solution Approach 1:
The movable member is constructed as a composite structure combining a resin base material with a sheet metal member having a rolling surface. This composite design allows the resin to provide ease of manufacture and damping properties while the sheet metal member provides the necessary strength and durability for the rolling surface that contacts the rolling member during image blur correction operations.
4Reliability
If a spring is used to urge the movable member, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The mechanical spring urging mechanism is replaced with a magnetic urging mechanism. Magnets are disposed in the fixed member to generate magnetic attractive force that acts on the movable member, providing the necessary urging force without requiring physical contact or mechanical components. This substitution reduces device complexity while maintaining or improving reliability through contactless operation.
5Reliability
If the resin part has a linear expansion coefficient closer to the image capture device, then the reliability is improved, but the material selection becomes more restricted
Solution Approach 1:
The linear expansion coefficient of the resin part is specifically controlled and matched to be close to that of the image capture device. This parameter matching reduces thermal stress and deformation during temperature changes, improving reliability. The patent addresses the material selection restriction by carefully selecting resin materials that meet both the expansion coefficient requirement and other necessary properties for the application.
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 provides a strong and reliable image blur correction mechanism that withstands impacts and temperature changes, maintaining image quality by reducing deformation and thermal stress, and minimizing magnetic noise.
Implementation Method 1
a movable member that includes a sheet metal member and a resin part molded integrally with the sheet metal member
Implementation Method 2
part of the movable member, where the sheet metal member is exposed from the resin part, forms a rolling surface on which the rolling member rolls
Implementation Method 3
a method of arranging magnets and a magnetic component (object to be attracted) in one and the other of the movable member and the fixed member, respectively, thereby causing the movable member and the fixed member to magnetically attract each other
Implementation Method 4
using a resin part with a linear expansion coefficient closer to that of the image capture device, and utilizing magnetic attraction for urging, thereby enhancing the movable member's strength and reliability
Data Source
AI summary
An image blur correction device that forms a strong rolling surface on a movable member having a resin part and is improved in strength of the movable member. The image blur correction device includes a fixed member, rolling balls, and the movable member that includes a sheet metal member and the resin part molded integrally with the sheet metal member, holds an image capture device, and is movable in a direction orthogonal to an optical axis of the image capture device, relative to the fixed member. Part of the movable member, where the sheet metal member is exposed from the resin part, forms the rolling surfaces on which the rolling members roll, and the sheet metal member is formed into a shape surrounding the image capture device, as viewed from the optical axis direction.