Camera Module Position Detection with Isolated Sensing Magnet
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Solution Overview
Problem
Camera modules with multiple driving units and magnets face poor detection reliability due to interference from magnetic fields, affecting focus adjustment and camera shake correction.
Innovation Solution
A camera module design featuring a movable body with distinct frames and driving units, utilizing ball bearings and strategically positioned sensing magnets and detection sensors to minimize interference and enhance position detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple driving units with magnets are disposed around the lens module to enable focus adjustment and camera shake correction, then the camera module achieves multi-directional movement capability, but the detection reliability of the lens module position deteriorates due to magnetic field interference
Solution Approach 1:
The patent extracts the sensing magnet from the driving units and places it separately on the movable body, while the detection sensor is placed on the housing. This separation removes the sensing function from the magnet-containing driving units, eliminating magnetic field interference from the detection system while preserving the driving units' multi-directional movement capability
Solution Approach 2:
The patent introduces a dedicated sensing magnet as an intermediary element that couples the movable body to the detection sensor. This sensing magnet serves as a mediator that transmits position information to the sensor without being part of the driving units, thereby isolating the detection system from magnetic field interference while enabling position detection
2Speed
If driving units are positioned close to the lens module to achieve precise control, then the responsiveness and speed of focus adjustment improve, but magnetic field interference increases and compromises detection accuracy
Solution Approach 1:
The patent segments the camera module into distinct functional zones: driving units with magnets for actuation, a separate sensing magnet for detection, and a detection sensor for measurement. This spatial segmentation allows driving units to operate close to the lens for fast response while the sensing magnet and detector are positioned to minimize magnetic interference
Solution Approach 2:
The sensing function is extracted from the driving units and implemented as a separate sensing magnet-detection sensor system. This extraction enables the driving units to be positioned optimally for fast focus adjustment without compromising detection accuracy, as the sensing system is magnetically isolated
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
Improves the reliability and speed of image stabilization and focus adjustment by effectively detecting the position of the lens barrel, reducing interference from driving magnets and enhancing overall camera performance.
Implementation Method 1
a first driving unit, disposed on a first surface of the movable body, and configured to generate a first driving force to move the movable body in the direction of the optical axis
Implementation Method 2
a second driving unit, disposed on a second surface and a third surface of the movable body, and configured to generate a second driving force to move the movable body in the direction perpendicular to the optical axis
Implementation Method 3
The detection sensor is configured to detect the position of the lens module through a change in the magnetic field according to the movement of the lens module
Data Source
AI summary
A camera module device is provided. The device includes a movable body configured to accommodate a lens barrel and configured to be moved in a direction of an optical axis and in a direction perpendicular to the optical axis, a housing configured to accommodate the movable body, a first driving unit, disposed on a first surface of the movable body, and configured to generate a first driving force to move the movable body in the direction of the optical axis, a second driving unit, disposed on a second surface and a third surface of the movable body, and configured to generate driving force to move the movable body in a direction perpendicular to the optical axis, and a first sensing unit, disposed on a fourth surface of the movable body, and configured to detect a position of the lens barrel moved in a direction perpendicular to the optical axis.