Auto-Focus Magnet Holding Structure Corner Field Enhancement
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Solution Overview
Problem
Conventional miniature lens auto-focus modules with voice coil motors experience reduced driving efficiency due to wasted electromagnetic field at the corners of the outer frame, leading to increased power consumption.
Innovation Solution
Incorporating inverted L-shaped plates at the inner corners of the outer frame to enhance magnetic field efficiency between the magnets and the winding, allowing the electromagnetic field to effectively interact with the magnets, thereby increasing driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional auto-focus module design is used with magnets mounted on inner wall surfaces, then the structure is simple and easy to manufacture, but the electromagnetic field is wasted at the corners causing reduced driving efficiency
Solution Approach 1:
The patent introduces corner filling plates as intermediary components that fill the corner spaces between adjacent magnets. These plates serve as mediators to guide and concentrate the electromagnetic field lines, enabling the field to effectively interact with the magnets at corner regions that were previously wasted space, thereby improving driving efficiency without complicating the manufacturing process
2Loss of energy
If the electromagnetic field is allowed to reach corner spaces, then more magnetic interaction is achieved, but the magnetic field efficiency at corners is initially poor due to lack of magnetic material
Solution Approach 1:
The patent converts the previously harmful or wasted electromagnetic field at the corners into a beneficial force by introducing corner filling plates made of magnetic material. These plates capture the electromagnetic field lines that would otherwise be lost, converting the wasted field into useful magnetic interaction that drives the lens holder, thereby improving both energy utilization and field efficiency
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 magnetic field efficiency at the corners is enhanced by 1.95 times, resulting in increased driving force and power saving in the auto-focus module.
Implementation Method 1
When the winding 17 is excited by supplying electric current thereto, a magnetic field is produced for the winding 17 and the magnets 14 to magnetically repel or attract one another
Implementation Method 2
the electromagnetic field produced by the excited winding can have enhanced magnetic efficiency at the corners of the winding
Data Source
AI summary
A magnet holding structure of auto-focus module includes an outer frame for holding four magnets to four inner wall surfaces of the outer frame; a lens holder for holding a lens thereto and being assembled to the outer frame via at least one spring member; and a winding fitted around the lens holder for driving the lens holder to axially move forward or rearward to focus automatically. The outer frame is provided at each of four inner corners with an inverted L-shaped plate extending downward from a top of the outer frame to locate between the lens holder and the winding, so as to face toward four spaces respectively existing between two adjacent magnets outside the winding. With these arrangements, the electromagnetic field produced by the winding can have enhanced magnetic efficiency and increased driving force at the corners of the winding to achieve the purpose of power saving.