Lens Driving Apparatus Leaf Spring Biasing
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Solution Overview
Problem
Existing lens driving apparatuses with piezoelectric driving parts biased by coil springs have complex structures, making it desirable to simplify the biasing mechanism.
Innovation Solution
A lens driving apparatus with a piezoelectric driving part biased by a leaf spring member, which includes a fixed part, a supporting part, and an elastic deformation part, allowing for simpler structure and effective biasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coil springs are used to bias the piezoelectric driving part, then the biasing function is achieved, but the structure becomes complicated
Solution Approach 1:
The patent combines the biasing function and support function into a single leaf spring member. The leaf spring member integrates the role of providing biasing force (replacing multiple coil springs) and supporting the piezoelectric driving part, thereby simplifying the overall structure while maintaining the necessary biasing function.
Solution Approach 2:
The patent changes the physical state and mechanical properties of the biasing element from coiled spring geometry to a flat leaf spring geometry. This parameter change in the structural form allows the biasing function to be achieved with a simpler, more integrated component that also provides support functionality.
2Device complexity
If the piezoelectric driving part is simplified, then the structure becomes simpler, but the reliability of biasing may be compromised
Solution Approach 1:
The leaf spring member is designed to perform multiple functions simultaneously: it provides the biasing force to press the piezoelectric driving part against the receiving member, and also serves as a support structure for the piezoelectric driving part. This multi-functionality ensures that simplification does not compromise reliability, as the single component fulfills both critical roles.
Solution Approach 2:
The leaf spring member is constructed from elastic material that combines structural support capability with biasing force generation. The material properties are selected to ensure both the mechanical strength needed for support and the elasticity required for reliable biasing, thereby maintaining reliability while achieving structural simplification.
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 simplified structure enables efficient biasing of the piezoelectric driving part, allowing for reliable movement of the lens holding member relative to the fixed member, thus achieving effective lens focusing mechanisms.
Implementation Method 1
a piezoelectric driving part including a piezoelectric element is biased to the lens holding member direction by a plurality of coil springs and pressed against an axial guide part
Implementation Method 2
a lens driving unit (lens driving apparatus) that can move a lens carrier (lens holding member) in an optical axis direction relative to a module base (base member) by friction drive using bending vibration of a piezoelectric element
Implementation Method 3
an elastic deformation part that is capable of elastically deforming and provided between the fixed part and the supporting part
Data Source
AI summary
A lens driving apparatus includes a fixed member, a lens holding member, a piezoelectric driving part having a piezoelectric element extending in a direction perpendicular to an optical axis direction, a receiving member, and a biasing member, the lens holding member moves relative to the fixed member by movement of the piezoelectric element, the biasing member is composed of a leaf spring member, the piezoelectric driving part includes a contact member and a flexible printed circuit, the piezoelectric element and the contact member are fixed with one adhesive, the flexible printed circuit and the supporting part are fixed with another adhesive, and the Young's modulus of the other adhesive is smaller than the Young's modulus of the one adhesive.