Optical Unit Gimbal Mechanism Dual-Axis Displacement
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Solution Overview
Problem
Conventional optical units face difficulties in displacing a movable body with a reflection portion greatly relative to a fixed body, as reducing the strength of supporting components like plate springs leads to oscillation and resonance issues, while configurations allowing single-axis movement limit displacement.
Innovation Solution
The optical unit employs a gimbal mechanism that supports the movable body swingably about a first axis and a bearing mechanism that supports the gimbal mechanism swingably about a second axis, intersecting the first axis, allowing for dual-axis movement, along with a magnetic drive system and a preload generating member like a plate spring to enhance mobility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the strength of the plate spring is reduced to allow great displacement of the movable body, then the displacement capability is improved, but the movable body easily oscillates and resonance frequency approximates the drive frequency
Solution Approach 1:
The patent transitions from single-axis movement to dual-axis movement by introducing a gimbal mechanism with a first axis and a second axis. This dimensional expansion allows the movable body to achieve greater displacement capability while maintaining stability through the intersecting axis configuration, resolving the contradiction between displacement and oscillation.
2Ease of operation
If a plate spring configuration is used to support the movable body, then the structure is simple, but it is difficult to greatly displace the movable body relative to the fixed body
Solution Approach 1:
The patent introduces dynamic movement capability along two intersecting axes through the gimbal mechanism, transforming the static or single-degree-of-freedom plate spring structure into a dynamic dual-axis system. This enables great displacement of the movable body while managing the increased structural complexity through functional integration.
3Reliability
If the movable body is displaced greatly relative to the fixed body for effective camera shake correction, then the camera shake cancellation is improved, but the structural integrity and stability are compromised
Solution Approach 1:
By implementing dual-axis movement capability, the system can effectively correct camera shake in multiple directions while maintaining structural stability. The intersecting axis configuration of the gimbal mechanism provides the necessary degrees of freedom for comprehensive shake correction without compromising structural integrity.
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 enables significant displacement of the movable body relative to the fixed body, effectively canceling camera shake while maintaining structural integrity and preventing oscillation, even in thin optical unit designs.
Implementation Method 1
a movable mechanism which allows the movable body to move relative to the fixed body; the movable mechanism may be configured to include a magnet provided on the movable body, and a coil provided at a position opposed to the magnet on the fixed body
Implementation Method 2
a gimbal mechanism provided with a first support portion which supports the movable body swingably about a first axis
Implementation Method 3
a bearing mechanism which supports the gimbal mechanism swingably relative to the fixed body about a second axis intersecting a direction of the first axis
Implementation Method 4
a preload generating member which generates a preload in the bearing mechanism; the preload generating member may be configured to be an elastic member
Data Source
AI summary
An optical unit according to one embodiment including: a reflection portion which reflects an incident light flux, which is made incident from outside, in a reflection direction toward an imaging element from an incident direction; a movable body provided with the reflection portion; a fixed body; a movable mechanism which allows the movable body to move relative to the fixed body; a gimbal mechanism provided with a first support portion which supports the movable body swingably about a first axis; and a bearing mechanism which supports the gimbal mechanism swingably relative to the fixed body about a second axis intersecting the first axis direction.