Optical Unit Drive Magnet Single-Pole Orientation
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Solution Overview
Problem
Conventional optical units for portable devices, such as smartphones, face a decrease in drive force when the turning angle of the movable body with respect to the fixed body is increased, leading to a larger size and reduced miniaturization, and the manufacturing cost of two-pole magnetized drive magnets is high.
Innovation Solution
The optical unit incorporates a drive magnet magnetized in the optical axis direction with different magnetic poles on each face, and a drive coil with a small inner diameter, preventing opposite-directed electromagnetic forces and allowing for miniaturization while maintaining drive force, and using single-pole magnetization to reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a two-pole magnetized drive magnet is used, then the drive force is sufficient, but the manufacturing cost is high
Solution Approach 1:
The patent changes the magnetization parameter from two-pole to single-pole magnetization. The drive magnet is magnetized in a single direction (optical axis direction) with only one magnetic pole facing the drive coil, eliminating the need for complex two-pole magnetization patterns while still generating sufficient electromagnetic force for the gimbal mechanism.
2Adaptability or versatility
If the turning angle is increased, then the optical axis inclination is improved, but the drive force decreases
Solution Approach 1:
The patent employs a dynamic drive mechanism where the drive magnet and drive coil are positioned to optimize electromagnetic interaction across a wide range of motion. The single-pole magnetization configuration maintains effective magnetic flux linkage with the drive coil throughout the full turning angle range, ensuring consistent drive force from -60 degrees to +60 degrees of optical axis inclination without the force decay that plagues conventional designs.
3Force
If the drive coil inner diameter is large, then the drive force is maintained, but the device size increases
Solution Approach 1:
The patent changes the geometric parameters of the drive coil, specifically reducing the inner diameter while compensating for the reduced area through optimized positioning of the single-pole magnetized drive magnet. This parameter optimization allows the drive coil to be miniaturized without sacrificing drive force, as the concentrated magnetic flux from the single pole maintains effective electromagnetic interaction with the smaller coil area.
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 ensures a stable drive force even at large turning angles, miniaturizes the optical unit, and reduces manufacturing costs by simplifying the magnetization process.
Implementation Method 1
a drive mechanism for turning the movable body with respect to the fixed body so that an optical axis of the optical module is inclined. The drive mechanism includes a drive magnet which is attached to the movable body and a drive coil which is attached to the fixed body
Data Source
AI summary
An optical unit includes a movable body having an optical module, a fixed body which holds the movable body, and a drive mechanism for turning the movable body with respect to the fixed body so that an optical axis of the optical module is inclined. The drive mechanism includes a drive magnet attached to the movable body and a drive coil attached to the fixed body. The drive magnet and the drive coil face each other in a direction perpendicular to an optical axis direction of the optical module when the optical module is located at a predetermined reference position. The drive magnet is magnetized in the optical axis direction, and a magnetic pole of one face of the drive magnet in the optical axis direction and a magnetic pole of the other face of the drive magnet in the optical axis direction are different from each other.