Dual-Pole Electromagnetic Focusing System for Micromotor Interference Reduction
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Solution Overview
Problem
Existing micromotor systems for mobile phone cameras face accuracy and stability issues due to electromagnetic interference between driving magnets, sensing magnets, and detection elements, leading to inaccurate focusing and shake prevention, especially when the camera lens is tilted, and they are bulky due to the need for multiple magnets.
Innovation Solution
A dual-pole electromagnetically-driven focusing system with dual-pole magnets and coils arranged in a U-shaped structure, distant from the sensing magnet and detection elements, reduces noise interference and maintains driving force, eliminating the need for additional magnets and yokes, thus improving accuracy and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If four driving magnets are arranged around the coil to provide driving force in all directions, then the micromotor can achieve focusing and shake prevention functions, but the driving magnets generate magnetic forces that interfere with each other and with the sensing magnet, causing detection accuracy to deteriorate
Solution Approach 1:
The patent extracts the sensing magnet from the coil assembly and places it on the movable base instead. This separation removes the source of magnetic interference from the detection zone, allowing the four driving magnets to provide full-directional driving force without interfering with the detection element's accuracy.
Solution Approach 2:
The patent introduces a flexible circuit board as an intermediary carrier for the sensing magnet and detection element. This allows the sensing magnet to be positioned on the movable base while maintaining electrical connections, effectively mediating between the driving magnets and the detection system to prevent magnetic interference.
2Volume of moving object
If the detection element and sensing magnet are positioned at the corner of the coil to save space, then the micromotor structure is compact, but the magnetic attraction between driving magnets and sensing magnet causes interference with the slidable base movement
Solution Approach 1:
The sensing magnet is extracted from the corner position of the coil and relocated to the movable base. This extraction eliminates the magnetic attraction interference between the driving magnets and sensing magnet, preventing unwanted forces on the slidable base while maintaining compact overall structure.
Solution Approach 2:
The sensing magnet is moved from a two-dimensional plane (corner of the coil) to a different spatial location (on the movable base). This dimensional relocation separates the sensing function from the driving function in space, eliminating magnetic interference while preserving compact design.
3Measurement precision
If multiple sensing magnets are used to improve detection accuracy, then position detection precision is enhanced, but the weight of the micromotor structure increases
Solution Approach 1:
The patent combines multiple functions (sensing, detection, and positioning) into a single integrated assembly on the movable base. By merging the sensing magnet with the detection element and mounting them together on the flexible circuit board, the system achieves accurate position detection without the weight penalty of multiple separate magnets.
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
This configuration enhances focusing accuracy and shake prevention by minimizing signal variation caused by posture changes and reduces the overall size and weight of the system, maintaining sufficient driving force while minimizing electromagnetic interference.
Implementation Method 1
When the coil 80 is fed with an electrical current, interaction with the driving magnets 81, 82, 83, 84 on the four sides to generate a Lorentz force
Implementation Method 2
a detection element 91, which allows for mutual detection with respect to a sensing magnet 92 arranged at an inner side of the coil 80
Data Source
AI summary
A dual pole electromagnetically-driven focusing system of a micromotor includes a movable base having an elastic support system on upper and lower sides thereof and an outside configuration in a parallelepiped form having four side surfaces. Two loop coils are respectively fixed to two opposite side surfaces of the slidable base. Two dual-pole magnets are respectively arranged beside the two loop coils in a manner of being opposite to each other in respect of magnetism so that the two loop coils, upon energized, generate acting forces in opposite direction with respect to the two dual-pole magnets. A circuit device is arranged on one side surfaces of the movable base between the two loop coils. Three successive side surfaces of the movable base that are respectively provided with a combination of loop coil and dual-pole magnet, the circuit device, another combination of loop coil and dual-pole magnet, form a U-shaped structure.