Lens Driving Device Elastomer Hinge OIS Sensitivity
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Solution Overview
Problem
Conventional lens driving devices face challenges in increasing Optical Image Stabilization (OIS) sensitivity while maintaining reliability, as small suspension wires are prone to rupture and deflection, degrading tilt characteristics, and the AF driving part's complex structure requires intricate assembly.
Innovation Solution
A lens driving device with a shake-correcting and auto-focusing mechanism using elastomer-based biaxial hinge structures for the supporting parts, replacing suspension wires and leaf springs, to enhance OIS sensitivity and simplify assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diameter of the suspension wire is reduced to increase OIS sensitivity, then the OIS sensitivity is improved, but the reliability deteriorates due to high risk of rupture and deflection
Solution Approach 1:
The patent changes the material parameter from traditional suspension wire to elastomer material, which fundamentally alters the mechanical properties. The elastomer provides both high sensitivity (enabling small diameter equivalent performance) and high reliability (resistance to rupture and deflection) simultaneously, resolving the contradiction between OIS sensitivity and reliability
Solution Approach 2:
The patent employs elastomer material that combines the properties of flexibility and durability. This composite material approach allows the supporting part to achieve both the sensitivity required for precise OIS and the reliability needed to withstand impact and repeated use without rupture or deflection
2Measurement precision
If the diameter of the suspension wire is reduced to increase OIS sensitivity, then the OIS sensitivity is improved, but the tilt characteristics deteriorate due to deflection
Solution Approach 1:
By changing from suspension wire to elastomer material, the patent achieves a material with superior dimensional stability. The elastomer's resistance to deflection ensures that the OIS movable part maintains proper orientation and parallelism during operation, preserving tilt characteristics while achieving high sensitivity through optimized geometry rather than merely reducing diameter
3Reliability
If the AF driving part uses a complex structure with leaf springs, then the supporting function is improved, but the device complexity increases and assembly becomes difficult
Solution Approach 1:
The patent merges the supporting function previously distributed across multiple leaf springs into a single integrated elastomer component. This consolidation maintains all necessary supporting functions while eliminating the complexity of multiple separate parts, thereby simplifying the overall structure and assembly process
Solution Approach 2:
The elastomer supporting part serves multiple functions simultaneously: it supports the OIS movable part, provides elastic restoration, enables biaxial hinge movement, and withstands impact. This multi-functionality replaces the complex assembly of leaf springs and suspension wires with a single universal component, reducing device complexity while maintaining or improving reliability
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 solution significantly reduces the risk of damage from impacts, simplifies the structure, and increases OIS sensitivity, ensuring high reliability and improved tilt characteristics with reduced component complexity.
Implementation Method 1
The shake-correcting supporting part is made of an elastomer material, and has a biaxial hinge structure for supporting the shake-correcting movable part such that the shake-correcting movable part is movable in the plane orthogonal to the light axis direction
Implementation Method 2
performing shake correction by swaying the shake-correcting movable part with respect to the shake-correcting fixing part in a plane orthogonal to the light axis direction by use of a driving force of a voice coil motor including the shake-correcting coil part and the shake-correcting magnet part
Data Source
AI summary
A lens driving device, a camera module and a camera mounting device are provided, which are capable of ensuring a high reliability, improving the OIS sensitivity, and simplifying the assembly operation. The lens driving device includes an auto-focusing driving part and a shake-correcting driving part utilizing a voice coil motor. A shake-correcting magnet part of the shake-correcting driving part is comprised of two shake-correcting magnets disposed on two orthogonal sides of four sides that define a rectangle in a plane perpendicular to the light axis direction. An auto-focusing magnet part of the auto-focusing driving part is comprised of at least one of the shake-correcting magnets. An auto-focusing supporting part of the auto-focusing driving part is fixed on at least one side of the rectangle where the auto-focusing magnet part is not disposed, and elastically supports an auto-focusing movable part with respect to an auto-focusing fixing part in a cantilever fashion.