Lens Driving Device Vibration Correction via Center of Gravity Actuation
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Solution Overview
Problem
Conventional lens driving devices in cameras and portable electronic apparatuses suffer from image vibration due to hand vibration, leading to reduced image quality and increased power consumption, with insufficient rigidity and noise issues in vibration correction.
Innovation Solution
A lens driving device with a support frame and shaft pins allowing free rotation orthogonal to the optical axis, featuring electromagnetic driving components positioned near the center of gravity, and repulsive force magnets to stabilize the lens module, reducing vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens driving device allows free rotation orthogonal to the optical axis to correct hand vibration, then image vibration correction performance is improved, but device complexity increases
Solution Approach 1:
The lens driving device is divided into independent functional modules: the lens module with lens holder, the support frame with shaft pins, the electromagnetic driving device, and the base for fixing the circuit board. This segmentation allows each module to perform its specific function (rotation, positioning, driving, control) independently, achieving effective vibration correction while maintaining manageable device complexity through modular design.
Solution Approach 2:
The lens holder serves multiple functions: it holds the lens, enables rotation orthogonal to the optical axis for vibration correction, and positions the electromagnetic driving device. The support frame with shaft pins simultaneously provides rotation support and maintains structural rigidity. This multi-functionality reduces the need for additional components, resolving the contradiction between performance and complexity.
2Reliability
If the electromagnetic driving device is positioned near the center of gravity of the lens module, then vibration is reduced and image quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The electromagnetic driving device is positioned at a specific location near the center of gravity of the lens module, as indicated in the patent. This localized precise positioning optimizes vibration reduction and image quality by balancing the rotational movement. The support frame with shaft pins provides a structured framework that guides and constrains the lens holder's rotation, making the precise positioning achievable and maintaining manufacturing feasibility.
3Reliability
If the lens holder is allowed to rotate freely orthogonal to the optical axis, then hand vibration correction is improved, but stability of the lens module decreases
Solution Approach 1:
The lens holder is designed to rotate freely orthogonal to the optical axis, enabling dynamic response to hand vibrations. The support frame with shaft pins provides a controlled rotation mechanism that allows movement in the necessary directions for vibration correction while maintaining structural integrity. This dynamic design enables the system to adapt to vibration conditions while preserving overall stability.
Solution Approach 2:
The support frame acts as an intermediary between the base and the lens holder, providing a structured connection that enables controlled rotation. The shaft pins serve as intermediaries that guide the rotation movement, ensuring it occurs in the correct directions for vibration correction while maintaining stability. This intermediary structure resolves the contradiction by mediating between free rotation and stability requirements.
4Device complexity
If a conventional coil and magnet configuration is used for focusing, then the structure is simple, but driving noise is generated towards the shooting sensor
Solution Approach 1:
The electromagnetic driving device is extracted from the conventional coil-and-magnet configuration and repositioned adjacent to the center of gravity of the lens module, as specified in the patent. This extraction and repositioning separates the driving function from the traditional location, reducing the generation of driving noise towards the shooting sensor while maintaining the simple electromagnetic driving structure.
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 effectively adjusts the lens movement to prevent vibration, enhancing image quality and reducing power consumption by stabilizing the lens module relative to the base, thereby improving image capture.
Implementation Method 1
When a current is applied to the coil, the coil drives the lens holder to move along an optical axis direction of the lens under an action of an electromagnetic force
Implementation Method 2
second repulsive force magnets that attract in a supporting direction and are limited in position, and the lens module is provided with first repulsive force magnets arranged in a direction orthogonal to an optical axis
Data Source
AI summary
The present invention provides a lens driving device, a camera and an electronic apparatus with a small size and an excellent effect in hand vibration correction. The lens driving device includes a case having an accommodation space, in which a lens module is provided. The lens module includes a lens, a lens holder receiving the lens, a support frame for freely rotating the lens holder in a direction orthogonal to an optical axis direction, support members, an electromagnetic driving device, and a base for fixing a circuit board; the electromagnetic driving device is arranged on the lens holder and the base for fixing the circuit board, and is provided adjacent to a level of a center of gravity of the lens module; and the lens module have different movement axes in a plane and is rotatable freely relative to the base for fixing the circuit board.