Optical Unit Shake Correction Turning Axis
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Solution Overview
Problem
In optical units with shake correction functions, the inclination of the movable body with respect to the fixed body occurs due to gaps between the support shaft and the shaft passing hole, leading to potential misalignment and instability during image stabilization.
Innovation Solution
The optical unit incorporates a turning axis part with spherical balls and an urging member to prevent inclination, ensuring precise alignment and stability by using a first ball fixed to the urging member and a second ball fixed to the fixed body, with receiving parts and a connecting plate to maintain dimensional accuracy and resist wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a support shaft with a shaft passing hole is used to enable the movable body to turn, then the shake correction function is achieved, but a gap space forms between the support shaft and shaft passing hole causing the movable body to incline
Solution Approach 1:
A ball is introduced as an intermediary element between the support shaft and the movable body. The ball fits in the shaft passing hole and contacts the support shaft, eliminating the gap space while preserving the turning capability. This intermediary component transfers forces and maintains precise alignment without requiring a tight fit between the shaft and hole.
Solution Approach 2:
The ball's spherical shape allows it to rotate smoothly within the shaft passing hole while maintaining constant contact with the support shaft. This curvature enables the movable body to turn freely in all directions while the ball prevents inclination by distributing contact forces uniformly.
2Reliability
If the movable body is turned with respect to the fixed body, then image stabilization is achieved, but the movable body may be inclined due to gap space between support shaft and shaft passing hole
Solution Approach 1:
The ball serves as a mediator that maintains precise alignment during the turning operation. By fitting into the shaft passing hole and contacting the support shaft, the ball ensures that the movable body rotates accurately without developing inclination, thereby maintaining both image stabilization reliability and manufacturing precision.
3Device complexity
If a traditional support shaft structure is used, then the device complexity is low, but the movable body inclines due to gap space formation
Solution Approach 1:
The ball is a simple intermediary component that can be easily integrated into the existing support shaft structure. It adds minimal complexity while significantly improving positional stability by eliminating the gap space between the support shaft and shaft passing hole, preventing the movable body from inclining.
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 the inclination of the movable body with respect to the fixed body, ensuring accurate image stabilization and resilience against impacts, such as those from dropping, by maintaining the positional integrity of the balls and reducing wear on the receiving parts.
Implementation Method 1
an urging member which urges the first ball toward the second ball
Implementation Method 2
maintaining the positional integrity of the balls and reducing wear on the receiving parts
Data Source
AI summary
An optical unit with a shake correction function includes a reflection member reflecting light entering from the outside, a movable body turnably holding the reflection member, a fixed body turnably holding the movable body, a drive mechanism structured to turn the reflection member with respect to the movable body and turn the movable body with respect to the fixed body, and a turning axis part structuring a turning center of the movable body with respect to the fixed body. The movable body is capable of turning with respect to the fixed body with a first direction as an axial direction of turning, and the turning axis part includes a first ball disposed on one side of the movable body, a second ball disposed on the other side of the movable body and contacted with the fixed body, and an urging member which urges the first ball toward the second ball.