Lens Drive Device With Deformable Elastic Member
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Solution Overview
Problem
Conventional lens drive devices for cameras mounted on portable devices like cellular phones suffer from shake issues during photography, requiring a solution to correct image displacement and enhance impact resistance.
Innovation Solution
A lens drive device with a first holding body movable in the optical axis direction, a second holding body movable perpendicular to the optical axis direction, and elastic members supported by wires, allowing for focus adjustment and shake correction while preventing wire buckling through a deformable part and abutting member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second holding body is supported by wires to enable movement perpendicular to the optical axis for shake correction, then the device can correct image displacement, but the wires may buckle under impact loads
Solution Approach 1:
The patent introduces a deformable part that can be elastically deformed in the optical axis direction to cushion impact loads before they reach the wires. This beforehand cushioning mechanism prevents wire buckling by absorbing shock energy through controlled deformation of the deformable part, allowing the wires to maintain their structural integrity while still enabling shake correction functionality.
Solution Approach 2:
The deformable part acts as an intermediary between the second holding body and the wires. It mediates the transmission of forces by providing a compliant interface that protects the wires from direct impact loads while allowing the necessary movement for shake correction. The abutting member further reinforces this intermediary function by providing additional mechanical support.
2Reliability
If the deformable part is made highly flexible to prevent wire buckling, then impact resistance improves, but the optical axis inclination may increase during shake correction
Solution Approach 1:
The patent carefully controls the deformation parameters of the deformable part by designing it to deform only within a force range smaller than the buckling load of the wires. This parameter change approach allows the deformable part to provide sufficient cushioning for impact protection while maintaining deformation within limits that prevent excessive optical axis inclination, thus balancing impact resistance with optical precision.
Solution Approach 2:
The patent employs a composite structure combining the deformable part with the rigid wire support system and abutting member. This composite design allows different components to have optimized properties: the deformable part provides flexibility for impact absorption, while the wire and abutting member structure maintains rigidity for optical axis stability, achieving both impact resistance and precision control.
3Adaptability or versatility
If multiple drive mechanisms are added to enable both focus adjustment and shake correction, then functional versatility improves, but device complexity increases
Solution Approach 1:
The patent segments the drive functions into distinct mechanisms: a first drive mechanism for focus adjustment (optical axis direction) and second/third drive mechanisms for shake correction (perpendicular directions). This segmentation allows each mechanism to be optimized for its specific function while maintaining overall system versatility, managing complexity through functional decomposition.
Solution Approach 2:
The second holding body serves multiple functions: it holds the first holding body for focus adjustment, enables shake correction through perpendicular movement, and provides a mounting platform for the deformable part and wires. This multi-functionality reduces the need for separate components, thereby managing device complexity while maintaining versatility.
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 device effectively corrects shake-induced image displacement and enhances impact resistance by allowing smooth movement of the lens and holding bodies while restraining optical axis inclination and preventing wire buckling.
Implementation Method 1
an elastic member having a fixed part which is fixed to the second holding body and a deformable part which is capable of being elastically deformed in the optical axis direction
Implementation Method 2
a drive coil is wound around an outer peripheral face of a cylindrical tube-like sleeve which structures the movable lens body. Further, in the lens drive device, four magnets are disposed so as to face an outer peripheral face of the drive coil
Data Source
AI summary
A lens drive device may include a first holding body, a second holding body, a fixed body which holds the second holding body, a first drive mechanism to drive the first holding body, a second drive mechanism to drive the second holding body, a third drive mechanism structured to drive the second holding body in a different direction than the second drive mechanism, an elastic member having a fixed part which is fixed to the second holding body and a deformable part, and plural wires in a substantially straight line shape with one end side fixed to the deformable part and the other end side fixed to the fixed body.