Lens Driving Device Floating Rotational Connection
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Solution Overview
Problem
The existing lens driving devices experience significant size changes in the height direction during rotation due to their rotational connection structure, leading to an increased overall height, which is undesirable.
Innovation Solution
A lens driving device with a floating rotational connection using double-layer nested rolling balls and shape memory wires, where the fixing bracket, first support frame, and second support frame are connected through V-shaped sliding grooves and rolling balls, allowing for rotation around perpendicular directions while minimizing height changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rotation shafts are used to connect the fixing bracket with support frames, then the rotational connection is achieved, but the size change in the height direction increases
Solution Approach 1:
The patent replaces the traditional rotation shaft mechanical connection system with a rolling ball-based rotational connection system. The rolling balls are disposed in sliding grooves that guide rotational movement while maintaining compact dimensions, thereby eliminating the need for lengthy rotation shafts and reducing height direction size changes during lens module rotation.
Solution Approach 2:
The patent transitions from a conventional rotational connection approach to a multi-dimensional constraint system using rolling balls in sliding grooves. This dimensional change allows rotational movement to be achieved through a combination of rotational and translational components, enabling compact height while maintaining operational rotational capability.
2Ease of operation
If rotation shafts are used to connect support frames, then the rotational connection is achieved, but the overall height of the lens driving device increases
Solution Approach 1:
The patent replaces the traditional rotation shaft mechanical connection system with a rolling ball-based rotational connection system. The rolling balls are disposed in sliding grooves that guide rotational movement while maintaining compact dimensions, thereby eliminating the need for lengthy rotation shafts and reducing height direction size changes during lens module rotation.
Solution Approach 2:
The patent employs a nested structural arrangement where the first support frame is positioned within the second support frame, and the rolling balls are nested within sliding grooves formed by these frames. This nesting configuration maximizes space utilization and minimizes the overall height of the lens driving device while maintaining rotational functionality.
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 design reduces the size change in the height direction during rotation, thereby minimizing the overall height of the lens driving device and enhancing its structural compactness.
Implementation Method 1
a driving assembly including at least two shape memory wires; One of the at least two shape memory wires is connected between the second support frame and the fixing bracket, and is configured to drive the fixing bracket to rotate relative to the first support frame and the second support frame about the first direction. Another one of the at least two shape memory wires is connected between the second support frame and the first support frame, and is configured to drive the first support frame to rotate relative to the second support frame about the second direction.
Implementation Method 2
at least one first elastic support component configured to elastically connect the fixing bracket with the first support frame and providing a rotation restoring force for the fixing bracket to rotate relative to the first support frame about a first direction; and at least one second elastic support component configured to elastically connect the first support frame with the second support frame and providing a rotation restoring force for the first support frame to rotate relative to the second support frame about a second direction.
Data Source
AI summary
A lens driving device includes a fixing bracket; first and second support frames; a rotation assembly including first and second rolling balls so that the fixing bracket and the first support frame are spaced apart from each other and form a rotational connection about a first direction, and the first and second support frames are spaced apart from each other and form a rotational connection about a second direction; a driving assembly for driving the fixing bracket to rotate relative to the first and second support frames about the first direction and for driving the first support frame to rotate relative to the second support frame about the second direction; a flexible circuit board; and first and second elastic support components. The lens driving device reduces the height of the overall structure, and effectively reduces the height of the lens driving device.