Lens Driving Device Orthogonal Vibration Correction
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Solution Overview
Problem
Conventional lens driving devices in cameras and portable electronic apparatuses suffer from image vibration due to hand vibrations, leading to reduced image quality and insufficient optical correction, especially when the lens moves orthogonally to the optical axis.
Innovation Solution
A lens driving device with a case, lens module, support frames, electromagnetic driving mechanism, and a base for fixing a circuit board, where the electromagnetic driving device is positioned near the center of gravity of the lens module, and includes shaft pins, magnetic yokes, and leaf springs to allow orthogonal rotation and adjust the optical axis, thereby stabilizing the lens movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens driving device uses conventional coils and magnets with linear movement parallel to the optical axis, then the focusing function is achieved, but the lens cannot effectively correct hand vibration in the direction orthogonal to the optical axis
Solution Approach 1:
The patent transitions from linear movement parallel to the optical axis to rotational movement in a plane orthogonal to the optical axis. The lens module is enabled to rotate freely around an optical axis, allowing dynamic adjustment in multiple directions to counteract hand vibration effectively.
Solution Approach 2:
The driving mechanism changes the movement dimension from linear (parallel to optical axis) to rotational (in a plane orthogonal to optical axis). This dimensional change enables the lens to correct vibration in the orthogonal direction, which was previously insufficient with linear movement only.
2Ease of operation
If the lens driving device uses rotary movement with double metal suspensions and ball bearings, then the lens can rotate freely, but the structure becomes complex and requires a holding part located at a high position away from the driving circuit
Solution Approach 1:
The patent extracts the ball bearing component from the traditional rotary mechanism and replaces it with a magnetic suspension system. The magnetic force directly suspends the lens module, eliminating the need for mechanical ball bearings and complex support structures.
Solution Approach 2:
The patent replaces the mechanical ball bearing system with a magnetic suspension system. The magnetic force provides the suspension function, eliminating mechanical contact and reducing structural complexity while maintaining free rotation capability.
3Strength
If the lens driving device uses a holding part at a high position away from the driving circuit, then the lens can be supported, but the optical sensor cannot be effectively corrected when rigidity is required
Solution Approach 1:
The patent merges the holding function and the driving function into a single integrated structure. The magnetic suspension system simultaneously provides support and enables precise movement control, allowing the optical sensor to be effectively corrected while maintaining rigidity.
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 suppresses image vibration and improves image quality by allowing precise adjustment and stabilization of the lens movement, preventing unwanted rotation and enhancing the correction of hand-induced vibrations.
Implementation Method 1
When a current is applied to the coils, the coils drive the lens holder to move along an optical axis direction of the lens under an action of an electromagnetic force
Implementation Method 2
the electromagnetic driving device is arranged at the support frames and the base for fixing the circuit board, and is arranged adjacent to a level of a center of gravity of the lens module
Data Source
AI summary
The present invention provides a lens driving device, a camera, and an electronic apparatus with a small size, a large correction angle and an excellent hand vibration correction effect. The lens driving device includes a case having an accommodation space, which accommodates a lens module; support frames, support members, and an electromagnetic driving device, for freely rotating the lens module in a direction orthogonal to an optical axis direction; and a base for fixing a circuit board; the electromagnetic driving device is arranged at the support frames and at the base for fixing the circuit board, and is arranged adjacent to a level of a center of gravity of the lens module; and the support frames includes a first support frame and a second support frame, each of the first support frame and the second support frame has different movement axes in a plane and is rotatable freely relative to the base for fixing the circuit board.