Halbach Array Coil Ratio for Optical Module Actuation
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Solution Overview
Problem
Current projectors face challenges in achieving high image resolution while minimizing device volume, as traditional magnetic driving assemblies are inefficient in generating the necessary magnetic force for optical element movement, and laser speckle issues arise from uneven projection surfaces.
Innovation Solution
The use of a Halbach array magnet structure in conjunction with a coil, where the ratio of the magnet structure's width to the coil's width is between 0.7 and 2, enhances the magnetic force, allowing for efficient movement of optical elements without increasing device volume, and the arrangement of multiple magnets on a permeable plate improves magnetic field strength and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a traditional magnetic driving assembly is used to drive the optical element, then the device volume can be kept small, but the magnetic force generated is insufficient for efficient optical element movement
Solution Approach 1:
The patent applies parameter changes by optimizing the width ratio between the Halbach array magnet structure and the coil to be between 0.7 and 2. This specific parameter range maximizes the magnetic force generation efficiency, allowing the driving assembly to produce sufficient magnetic force for efficient optical element movement while maintaining a compact device volume.
Solution Approach 2:
The patent uses a composite structure combining the Halbach array magnet structure with the coil in the driving assembly. This composite configuration leverages the advantageous magnetic field distribution of the Halbach array to enhance the magnetic force output without proportionally increasing the assembly's volume, thereby resolving the contradiction between force generation and device size.
2Measurement precision
If a high-resolution light valve is applied to increase image resolution, then the image resolution is improved, but the cost of the projection apparatus increases
Solution Approach 1:
The patent employs mechanical vibration by driving the optical element to reciprocally swing using the magnetic force from the driving assembly. This vibration technique enhances the effective resolution of the projected image without requiring a high-resolution light valve, thereby improving image quality while avoiding the high costs associated with high-resolution light valves.
3Object-affected harmful factors
If the optical element is driven to reciprocally translate to reduce laser speckle, then the laser speckle is reduced, but the device complexity increases
Solution Approach 1:
The driving assembly with the optimized Halbach array magnet structure and coil serves multiple functions: it generates sufficient magnetic force for efficient optical element movement, enables reciprocating swing to enhance resolution, and drives reciprocating translation to reduce laser speckle. This multi-functional design achieves speckle reduction and resolution enhancement without adding separate mechanisms, thereby avoiding increased device 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
This configuration enables a small-volume driving assembly to produce a sufficient magnetic force for smooth optical element movement, enhancing image resolution and reducing laser speckle, thus providing good projection quality without excessive device enlargement.
Implementation Method 1
The first frame is configured to move relative to the base by a magnetic force generated by the at least one driving assembly
Implementation Method 2
Each of the at least one driving assembly includes a coil and a Halbach array magnet structure, the coil and the Halbach array magnet structure face each other along a first direction
Data Source
AI summary
An optical module and a projection apparatus using the optical module are provided. The optical module includes a base, a first frame, an optical element and at least one driving assembly. The first frame is disposed in the base. The optical element is disposed in the first frame. The at least one driving assembly is disposed between the base and the first frame. The first frame is configured to move relative to the base by a magnetic force generated by the at least one driving assembly. Each of the at least one driving assembly includes a coil and a Halbach array magnet structure, the coil and the Halbach array magnet structure face each other along a first direction, a width of the Halbach array magnet structure in the first direction is W1, and a width of the coil in the first direction is W2, and 0.7≤W1/W2≤2.