Lens Support Guide Structure for Impact-Resistant Smooth Motion
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Solution Overview
Problem
Existing small-sized camera lens driving devices face issues with smooth movement due to impact from external forces, leading to potential damage such as dents or cracks in the ball hitting parts, as the attraction force between magnets and magnetic members is insufficient to prevent separation of the lens support from the balls.
Innovation Solution
The lens driving device employs a support mechanism with first and second moving member plates, featuring support protrusions and guide recesses that allow for orthogonal movement, ensuring contact at multiple points to distribute forces and maintain smooth movement, while magnets and magnetic members provide additional driving and attraction forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If balls are used to support the lens support for free movement, then the lens support can move freely relative to the frame member, but the lens support may separate from the balls under external force and cause impact damage
Solution Approach 1:
The support mechanism is divided into multiple independent support protrusions (first and second support protrusions) that contact the guide recess at multiple points. This segmentation distributes the load and maintains stability while allowing free movement, preventing the lens support from separating under external force.
Solution Approach 2:
The guide recess is designed with side surfaces that expand along the optical axis direction, creating a three-dimensional contact interface rather than simple point contact. This dimensional expansion ensures continuous contact between the support protrusion and guide recess, maintaining reliability while enabling smooth movement.
2Reliability
If the lens support is held firmly to prevent separation, then stability is improved, but smooth movement is restricted
Solution Approach 1:
The support mechanism uses a dynamic contact interface where the support protrusion moves within the guide recess. The guide recess's side surfaces expanding along the optical axis allow the protrusion to maintain contact while moving freely, achieving both stability and smooth movement through dynamic adaptation.
Solution Approach 2:
The guide recess acts as an intermediary structure between the support protrusion and the lens support. It mediates the interaction by providing a constrained path that allows movement while preventing separation, balancing stability and mobility requirements.
3Device complexity
If point contact is used between the frame member and balls, then the structure is simple, but impact forces concentrate and cause dents or cracks
Solution Approach 1:
The contact interface is segmented into multiple support protrusions and guide recesses distributed around the lens support periphery. This segmentation distributes impact forces across multiple contact points rather than concentrating them at a single point, preventing dents and cracks while maintaining structural simplicity.
Solution Approach 2:
The contact interface is transformed from point contact to line or surface contact by designing the guide recess with side surfaces that expand along the optical axis. This dimensional change increases the contact area, distributing impact forces and improving resistance to damage.
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 ensures reduced impact on the lens support and frame member, preventing damage and ensuring smooth movement by distributing forces and maintaining contact through the support mechanisms, even under external impacts.
Implementation Method 1
An attraction force generated between the magnet and the magnetic member causes the balls to be sandwiched between the lens support and the frame member
Data Source
AI summary
A lens driving device includes a lens support, a first moving member plate and a second moving member plate that surround around a periphery of the lens support, wherein the first moving, member plate is supported so as to be freely movable relative to the second moving member plate by a first support mechanism that includes a first support protrusion and a first guide recess into which the first support protrusion is fitted, the lens support is supported so as to be freely movable relative to the first moving member plate by a second support mechanism that includes a second support protrusion and a second guide recess into which the second support protrusion is fitted.