Micro Gimbal Camera Module Layout for Closed-Loop Focus Stability
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Solution Overview
Problem
Existing compact camera modules suffer from blurs and drifts due to external vibrations, particularly in intense vibrations or low-light scenarios, and magnetic fields from the gimbal and focusing magnets interfere with the stabilizing and focusing processes, preventing closed-loop control.
Innovation Solution
The MGS camera module includes a movable gimbal portion, static gimbal portion, gimbal drive assemblies, focusing drive assembly, and focusing feedback assembly, with controlled electromagnetic forces and positioning sensors to minimize magnetic interference, enabling closed-loop focusing and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic fields are generated by gimbal magnet and focusing magnet for stabilizing and focusing, then stabilizing and focusing functions are achieved, but magnetic interference occurs that prevents closed-loop control
Solution Approach 1:
The patent divides the camera module into separate functional components: gimbal stabilization system and focusing system. Each system has its own drive assembly with coils and magnets positioned independently. The gimbal drive assembly includes gimbal coils and gimbal magnets, while the focusing drive assembly includes focusing coils and focusing magnets, allowing independent control and reducing magnetic interference between systems.
Solution Approach 2:
The patent introduces magnetic shielding structures and positioning sensors as intermediaries between the magnetic field sources and sensitive components. Magnetic shielding materials are placed between magnets and coils to contain and direct magnetic fields, preventing interference. Positioning sensors detect the positions of magnets relative to coils without being affected by stray magnetic fields, enabling closed-loop control.
2Measurement precision
If magnetic shielding measures are implemented to reduce interference, then focusing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines magnetic shielding functions with existing structural components rather than adding separate shielding elements. The magnetic shielding is integrated into the housing and support structures that already exist in the camera module, thereby reducing focusing interference without significantly increasing device complexity.
Solution Approach 2:
The positioning sensors and control system automatically detect and compensate for magnetic field variations and positioning errors without requiring manual calibration or complex external equipment. The closed-loop control system continuously monitors magnet positions and adjusts coil currents to maintain accurate focusing, making the system self-correcting and reducing operational complexity.
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 achieves better focusing accuracy and stability by reducing magnetic interference, allowing for precise control of the focusing process and improved image quality.
Implementation Method 1
gimbal drive assemblies, where the gimbal drive assemblies are capable of driving the movable gimbal portion to rotate relative to the static gimbal portion, the gimbal drive assemblies each include a gimbal coil and a gimbal magnet that are opposite to each other
Implementation Method 2
focusing drive assembly, and a focusing drive assembly, where the focusing drive assembly is capable of driving the movable focusing portion to move relative to the static focusing portion along an optical axis direction, the focusing drive assembly includes a focusing coil and a focusing magnet that are opposite to each other
Implementation Method 3
focusing feedback assembly, where the focusing feedback assembly includes a focusing position sensor and a position magnet, the position magnet is provided on the movable focusing portion, and the focusing position sensor is provided on the static focusing portion
Data Source
AI summary
A micro gimbal stabilizer (MGS) camera module includes an MGS and a camera module, where the MGS includes gimbal drive assemblies, a movable gimbal portion, and a static gimbal portion movably connected to the movable gimbal portion; a gimbal magnet is provided on the movable gimbal portion; the camera module includes a movable focusing portion, a static focusing portion, a focusing drive assembly, and a focusing feedback assembly; the static focusing portion is relatively fixed with the movable gimbal portion; and a position magnet is provided on the static focusing portion. In response to a focusing process of the camera module, the focusing position sensor is relatively fixed with the gimbal magnet and the focusing magnet, which can effectively reduce influences of magnetic fields of the gimbal magnet and the focusing magnet on the focusing position sensor.