Lens Driving Device Shock Point for Handshake Reliability
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Solution Overview
Problem
Existing lens driving devices with handshake correction functions suffer from deformation of support members due to external shocks, leading to improper implementation of handshake correction and misalignment of the optical system, which disables correct image obtainment.
Innovation Solution
A lens driving device is designed with a base, a holder member mounted with a magnet, elastic support members, and stoppers to minimize deformation during external shocks. The device includes a circuit board with a pattern coil unit and a shock point formed between the bottom stopper and the base, which can include a shock absorber, to maintain reliability and proper assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lens driving device with handshake correction function is used, then image stabilization capability is improved, but support member deformation occurs under external shock
Solution Approach 1:
A shock point structure is provided between the holder member and base, positioned to contact during downward shock. This shock point absorbs impact energy before it reaches the support members, preventing deformation while maintaining the handshake correction function's reliability under external shock conditions.
2Volume of moving object
If the holder member is positioned closer to the base for compact design, then device size is reduced, but shock impact increases causing deformation
Solution Approach 1:
The shock point is strategically positioned to provide cushioning before shock reaches the support members. This allows compact positioning of the holder member near the base while the shock point absorbs impact energy, preventing support member deformation even in compact configurations.
3Ease of manufacture
If asymmetric shock protection is provided only at corners, then manufacturing complexity is reduced, but lateral surface shock causes deformation
Solution Approach 1:
The shock point is designed with universal applicability to handle shocks from any direction (corner or lateral surface). By positioning the shock point to contact the base during downward movement regardless of shock origin, a single structure provides comprehensive protection against asymmetric shocks from multiple directions, maintaining manufacturing simplicity while improving overall shock resistance.
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 improved lens driving device effectively minimizes deformation of support members during external shocks, ensuring reliable operation and proper alignment of the optical system for correct image acquisition.
Implementation Method 1
a plurality of support members configured to elastically support the holder member relative to the base
Implementation Method 2
The shock point formed between the bottom stopper and the base may include a shock absorber including any one of a urethane or foam cushioning and a damper
Data Source
AI summary
A lens driving device including a first lens driving unit for auto focusing, and a second lens driving unit for handshake correction is proposed, the lens driving device including a base, a holder member mounted with a magnet and positioned at an upper side of the base by being spaced apart from the base at a predetermined distance, a plurality of support members configured to elastically support the holder member relative to the base, an upper stopper protrusively formed at an upper surface of the holder member, and a bottom stopper protrusively formed at a bottom surface of the holder member to form a shock point between the base and the holder member when there is generated a shock.