Lens Driving Device Shape Memory Wire Spacing
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Solution Overview
Problem
The shape memory wires in existing SMA driving structures for lens driving devices interfere with each other during movement, affecting the image stabilization function.
Innovation Solution
A lens driving device with a three-layer support structure, where the fixed ends of shape memory wires are connected to an external second support frame, and the driving ends are connected to an internal fixing bracket and first support frame, allowing for increased spacing and preventing interference during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If shape memory wires are fixed between outer frame and inner frame in related art, then the structure is simple, but the wires interfere with each other during movement affecting image stabilization
Solution Approach 1:
The patent divides the support structure into multiple layers: an outer frame, an inner frame, and at least one intermediate frame positioned between them. This segmentation creates separate spatial zones for different components, allowing shape memory wires to be routed through different layers to avoid interference while maintaining structural integrity and image stabilization functionality.
Solution Approach 2:
The patent introduces an intermediate frame that adds a spatial dimension between the outer and inner frames. By routing shape memory wires through this intermediate layer, the system creates three-dimensional wire pathways that prevent planar interference, enabling wires to move independently without colliding while preserving the image stabilization function.
2Volume of moving object
If shape memory wires are closely spaced to save space, then the device size is reduced, but the wires cannot move freely causing interference
Solution Approach 1:
The patent implements a nested frame structure where the intermediate frame is positioned within the space between the outer and inner frames. This nesting arrangement efficiently utilizes available volume, creating wire routing pathways that provide sufficient movement freedom for shape memory wires while maintaining a compact overall device size.
Solution Approach 2:
By introducing the intermediate frame as an additional spatial layer, the patent creates three-dimensional wire routing paths. This dimensional addition allows wires to be spaced adequately for free movement without increasing the device's footprint, as the extra spacing is achieved in the depth dimension rather than expanding the planar dimensions.
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
The increased spacing between shape memory wires prevents interference, maintaining the image stabilization function of the lens driving device.
Implementation Method 1
the shape memory wires are energized by the printed circuit board so that the shape memory wires contract to generate a pulling force
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
Data Source
AI summary
A lens driving device includes fixing bracket, first support frame sleeved on the fixing bracket, second support frame sleeved on the first support frame, rotation assembly configured to make the fixing bracket rotate relative to the first support frame about a first direction and the first support frame rotate relative to the second support frame about a second direction, driving assembly for driving fixing bracket to rotate relative to first support frame about the first direction and driving the first support frame to rotate relative to the second support frame about the second direction, flexible printed circuit board, first elastic support components, and second elastic support components. The lens driving device increases spacing between adjacent two of crossing portions of the shape memory wires so that the shape memory wires have enough space for the movement, preventing the shape memory wires from being interfered with each other during the movement.