Three-Axis Lens Driver with Spring Suspension for Compact Auto-Focusing
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Solution Overview
Problem
Portable imaging devices face challenges in achieving auto-focusing and anti-shaking functions while maintaining a compact size, low cost, fast response, and stable actuation due to unwanted shaking, such as hand tremors, which existing lens driving apparatuses fail to address effectively.
Innovation Solution
A lens driving apparatus with a three-axis lens shifting mechanism, comprising a fixed assembly, a movable assembly with a lens holder, sets of coils, and a spring system, allowing movement along orthogonal axes for focusing and anti-shaking actions, with a damping element to absorb vibrations, and a specific spring design for balanced motion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lens driving apparatus is designed to perform auto-focusing and anti-shaking functions, then the imaging quality is improved, but the device complexity and size increase
Solution Approach 1:
The patent combines the auto-focusing and anti-shaking functions into a single lens driving apparatus. The movable assembly integrates both focusing coil and side coils to achieve dual functions simultaneously, reducing device complexity while maintaining imaging quality.
Solution Approach 2:
The lens driving apparatus is designed with multi-functionality, where the same movable assembly and magnet structure serve both auto-focusing (along optical axis) and anti-shaking (perpendicular to optical axis) purposes. This universal design improves imaging quality without proportionally increasing device complexity.
2Speed
If a lens driving apparatus is designed for fast response, then the focusing speed is improved, but the device complexity increases
Solution Approach 1:
The patent uses electromagnetic interaction between coils and magnets to drive the lens, replacing traditional mechanical focusing mechanisms. This electromagnetic actuation provides fast response for auto-focusing without requiring complex mechanical transmission components.
Solution Approach 2:
The movable assembly is designed to be dynamically controllable along three orthogonal axes through independent coil activation. The spring system provides dynamic suspension that enables fast response while maintaining stability, achieving high focusing speed without excessive device complexity.
3Adaptability or versatility
If a spring system is designed to allow movement along three orthogonal axes, then the anti-shaking capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The spring system is designed with specific parameter relationships (spring arm width to thickness ratio ≤ 1.1) that enable three-axis movement capability. By optimizing these geometric parameters, the system achieves anti-shaking functionality while keeping manufacturing precision requirements at practical levels.
Solution Approach 2:
The spring system exhibits different stiffness characteristics along different axes, with the spring constant ratios (Kx/Kz and Ky/Kz between 1-8) providing appropriate compliance for anti-shaking while maintaining focusing precision. This localized quality differentiation enables multi-axis movement without requiring uniform high precision throughout the entire system.
4Stability of the object's composition
If the spring arm width to thickness ratio is reduced, then the three-axis movement stability is improved, but the spring strength decreases
Solution Approach 1:
The spring design specifies that the spring arm width to thickness ratio should be ≤ 1.1, which optimizes the balance between stability and strength. This parameter optimization ensures the spring can support three-axis movement stability while maintaining sufficient mechanical strength for practical application.
Solution Approach 2:
The spring system likely uses materials with appropriate mechanical properties that compensate for the reduced width-to-thickness ratio. By selecting materials with suitable strength-to-weight ratios, the design achieves both movement stability and adequate spring strength without requiring excessive dimensions.
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 apparatus enables efficient auto-focusing and anti-shaking capabilities, reducing image blurriness caused by unwanted shaking, while achieving size reduction and cost-effectiveness through a simple and stable actuation mechanism.
Implementation Method 1
The three sets of coils may be configured to interact with the magnets and drive the movable assembly to move along the three axes
Implementation Method 2
a spring system attached between the movable assembly and the fixed assembly and configured to support the movable assembly and form a suspension system to allow the movable assembly to move along a first, a second, and a third orthogonal axes
Implementation Method 3
The apparatus enables efficient auto-focusing and anti-shaking capabilities, reducing image blurriness caused by unwanted shaking
Data Source
AI summary
A lens driving apparatus includes: a fixed assembly, the fixed assembly including a base frame; a movable assembly, the movable assembly including a lens holder; a set of magnets surrounding the movable assembly; three sets of coils; and a spring system attached between the movable assembly and the fixed assembly and configured to support the movable assembly and form a suspension system to allow the movable assembly to move along a first, a second, and a third orthogonal axes. The lens holder is configured to hold a lens unit, the third axis is parallel to an optical axis of the lens unit, while the first and second axes are respectively perpendicular to the third axis.