Lens Driving Device Spring Necking Stress Absorption
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Solution Overview
Problem
Existing lens driving devices experience inclination issues when the lens support moves due to the deformation and twisting of spring components, leading to unstable lens positioning and optical axis misalignment.
Innovation Solution
The introduction of necking parts on the spring component, which absorb stress and prevent twisting, allows for balanced preloading of wrist parts, reducing inclination by forming serpentine or straight line-shaped necking parts and using liquid sealing materials for fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If offset force is applied to the outer side retaining part of the spring component during assembly, then the lens support can be stably retained at the backmost position, but the spring component deforms and twists causing inclination when the lens support moves
Solution Approach 1:
The patent applies offset force to the spring component during assembly as a preliminary action to pre-load and stabilize the lens support at the backmost position. This preliminary positioning ensures stable retention while allowing the spring to accommodate subsequent movement without excessive deformation or twisting.
2Ease of operation
If the spring component is used to suspend the lens support, then the lens support can move in the Z axis direction, but the wrist parts deform and twist causing optical axis misalignment
Solution Approach 1:
The patent modifies the physical parameters of the spring component by adding necking parts with specific geometric features (narrower width, serpentine or straight line shape). These parameter changes allow the spring to move the lens support smoothly while maintaining wrist part alignment and preventing optical axis misalignment through controlled deformation patterns.
3Reliability
If offset force is applied to the outer side retaining part, then the lens support position is restricted at the backmost position, but inclination occurs when the lens support begins to move
Solution Approach 1:
The offset force applied during assembly serves as a preliminary action to properly position and pre-load the spring component. This preliminary positioning ensures that when the lens support moves, the wrist parts maintain proper alignment and the necking parts accommodate movement without causing inclination, thus maintaining both position restriction reliability and movement stability.
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 effectively reduces lens support inclination, ensuring stable movement and accurate alignment of the optical axis by distributing stress and maintaining preloading across all wrist parts.
Implementation Method 1
the coil 54 for driving the lens generates a Lorentz force in a direction towards the object to be shot (hereinafter, also called in front of the Z axis, in the +Z direction or on the +Z side)
Implementation Method 2
By utilizing the deformation of the necking parts, the lens driving device provided by the present invention is capable of absorbing the stress generated by the bending and deformation of the retaining part of the spring component along the directions of the X and Y plane
Implementation Method 3
an electromagnetic driving mechanism, which is used for driving the lens support in the Z axis direction
Data Source
AI summary
The present invention provides a lens driving device includes at least two spring components each of which includes an inner side retaining part, an outer side retaining part, a plurality of wrist parts configured between the inner and outer side retaining parts and prolonged along the circumference direction, inner side connecting parts for connecting one ends of the wrist parts with the inner side connecting part, and outer side connecting parts for connecting the other ends of the wrist parts with the outer side retaining part. Moreover, serpentine necking parts are formed at the roots of the connecting part of the inner side retaining part, straight line-shaped necking parts are formed at the roots of the connecting part of the outer side retaining part, so that stresses acting on the inner side connecting parts and the outer side connecting parts during assembling are absorbed.