Optical Unit Shake Correction Rolling Magnetic Drive
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Solution Overview
Problem
Existing optical units for portable terminals and mobile devices face issues with backlash and breakage due to the lack of sufficient support and pressure in rotary bearings, especially when subjected to impacts, which affect image stability during rotation.
Innovation Solution
The optical unit employs a dual rotary bearing support system with both subject-side and image-side rotary bearing parts to prevent tilting and backlash, incorporating a swinging magnetic-drive mechanism and a rolling magnetic-drive mechanism to stabilize the optical module around the optical axis, while reducing the risk of breakage by distributing loads evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rotary bearing part is used to support the optical module, then the device complexity is reduced, but the optical module becomes a cantilever state causing tilting and backlash during rotation
Solution Approach 1:
The rotary bearing support is segmented into two separate parts: a subject-side rotary bearing part and an image-side rotary bearing part. This segmentation eliminates the cantilever state by providing support at both ends of the optical module, preventing tilting and backlash during rotation while maintaining operational stability.
2Manufacturing precision
If a ball bearing is used as the rotary bearing, then the manufacturing precision is improved, but the reliability decreases due to easy breakage by drop impact and insufficient pressure application
Solution Approach 1:
The patent introduces a cushioning mechanism that applies predetermined pressure to the ball bearing before impact occurs. This pre-compression ensures the ball bearing is already under optimal pressure, preventing loosening during operation and providing resistance against drop impacts by maintaining continuous contact and load distribution.
Solution Approach 2:
The patent changes the pressure parameter applied to the ball bearing by introducing a biasing force (such as a spring or elastic element) that maintains continuous compression on the bearing. This parameter change from zero or variable pressure to constant predetermined pressure improves both precision and reliability by eliminating backlash and preventing impact-induced failure.
3Device complexity
If the optical module is supported by a cantilever structure, then the device complexity is reduced, but backlash occurs during rotation around the optical axis
Solution Approach 1:
The support structure is segmented into two rotary bearing parts positioned at opposite ends of the optical module along the optical axis. This dual-point support eliminates the cantilever configuration, providing bilateral restraint that prevents backlash during rotation while keeping the overall structure relatively simple.
Solution Approach 2:
The patent transitions from single-point support to two-point support along the optical axis dimension. By adding support in this dimension, the system eliminates the harmful backlash effect without significantly increasing complexity, as the additional bearing is positioned linearly along the existing axis.
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 reduces backlash and the risk of breakage by ensuring even load distribution and maintaining image stability during rotation, enhancing the durability and performance of the optical unit.
Implementation Method 1
a swinging magnetic-drive mechanism that swings the optical module around an axis intersecting an optical axis
Implementation Method 2
a rolling magnetic-drive mechanism that rotates the optical module around the optical axis
Data Source
AI summary
An optical unit includes a subject-side rotary bearing part located on a subject side of an optical module and an image-side rotary bearing part located on an image side of the optical module. The two rotary bearing parts disposed on both the subject side and the image side of the optical module make it possible to restrain the tilt of the optical module and restrain backlash during a rotation of the optical module around an optical axis. This prevents the optical module from becoming a cantilever state and a twisting load from being applied due to an impact. Thus, it is possible to reduce the possibility of breakage of the rotary bearing parts due to an impact. A movable body includes a rotary bearing holder which swingably supports the optical module. A rolling magnetic-drive mechanism is disposed between the rotary bearing holder and a fixed body.