Optical Element Driving Apparatus Thermal Expansion Compensation
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Solution Overview
Problem
The optical element driving apparatus in existing technologies experiences optical axis deviation due to thermal expansion of elastic support members, leading to inadequate shake correction and decreased image-capturing accuracy.
Innovation Solution
The apparatus employs a plurality of elastic resin support members with movable-side and fixed-side connection parts alternately arranged around the optical axis, allowing for thermal expansion absorption and preventing optical axis deviation, while utilizing a voice coil motor system for auto-focusing and optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single elastic support member is used to support the movable part, then the device complexity is reduced, but the optical axis stability deteriorates due to thermal expansion
Solution Approach 1:
The single elastic support member is divided into multiple support members (first, second, third, and fourth support members) arranged circumferentially around the optical axis. Each support member has connection parts with alternating arrangements of movable-side and fixed-side connection parts. This segmentation allows thermal expansion to occur radially without causing optical axis deviation, as the alternating connection parts distribute the expansion forces evenly.
2Ease of manufacture
If elastic support members are used to support the movable part, then the ease of manufacture is improved, but the image-capturing accuracy deteriorates due to optical axis deviation from thermal expansion
Solution Approach 1:
The connection parts are designed with asymmetric functional differentiation: movable-side connection parts allow movement in one direction while fixed-side connection parts provide anchoring in alternating positions. This asymmetric arrangement within the symmetric overall structure enables the support members to accommodate thermal expansion while maintaining optical axis positioning precision, resolving the contradiction between ease of manufacture and manufacturing precision.
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
This configuration effectively prevents optical axis deviation, ensuring improved image-capturing accuracy and stability by utilizing the elastic resin support members' thermal expansion compensation and the voice coil motor system's precise movement control.
Implementation Method 1
since the movable part is supported, by the elastic support member, in a cantilever state with respect to the fixing part, the optical axis may deviate in a case where the elastic support member thermally expands
Implementation Method 2
utilizing a voice coil motor system for auto-focusing and optical image stabilization
Implementation Method 3
The plurality of support members is formed of an elastic resin material
Data Source
AI summary
The optical element driving apparatus includes: a fixing part; a movable part allowing an optical element to be held therein; a plurality of support members supporting the movable part with respect to the fixing part; and a driving part that moves the movable part in a direction of an optical axis. The plurality of support members is formed of an elastic resin material, and each of the plurality of support members includes a movable-side connection part, which is connected to the movable part, and a fixed-side connection part, which is connected to the fixing part. A plurality of the movable-side connection parts and a plurality of the fixed-side connection parts are alternately arranged in a circumferential direction around the optical axis.