Reflective Device With Embedded Coil And Fixed Magnet
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Solution Overview
Problem
Scanning MEMS mirror devices face challenges with increased size and mass when a magnet is placed on the movable element, leading to higher power requirements and reduced oscillation frequency, while placing the coil on the movable element results in reduced reflective surface area and manufacturing difficulties.
Innovation Solution
A reflective device with a magnetic element secured to a fixed part and electrically conductive means completely embedded in the movable element, allowing the whole surface to be used for reflection and enabling oscillation without additional spacers, thus maximizing light reflection area and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the magnet is placed on the movable element, then the magnetic field interaction is achieved, but the size and mass of the movable element increase, leading to higher power requirements and reduced oscillation frequency
Solution Approach 1:
The patent inverts the conventional arrangement by placing the magnet on the fixed holder element instead of the movable element, and placing the coil on the movable element. This inversion transfers the magnetic field source to the stationary component, allowing the movable element to respond to the magnetic field without carrying the magnet's mass, thereby reducing oscillation mass and power requirements while maintaining the electromagnetic actuation function
Solution Approach 2:
The patent utilizes the third dimension by embedding the coil within the movable element's structure rather than placing it on the surface. This embedded configuration allows the magnetic field interaction to occur volumetrically throughout the movable element, maximizing the interaction area between the coil and magnetic field while minimizing the surface area occupied by magnetic components
2Speed
If the magnet is placed on the movable element, then the magnetic field interaction is achieved, but the inertia of the movable element increases, making it more difficult to oscillate at high frequency
Solution Approach 1:
The patent inverts the conventional arrangement by placing the magnet on the fixed holder element instead of the movable element, and placing the coil on the movable element. This inversion transfers the magnetic field source to the stationary component, allowing the movable element to respond to the magnetic field without carrying the magnet's mass, thereby reducing oscillation mass and power requirements while maintaining the electromagnetic actuation function
Solution Approach 2:
The patent changes the physical configuration parameters by embedding the coil within the movable element's structure and adjusting its position and dimensions. This parameter optimization allows for enhanced magnetic field interaction efficiency, enabling higher oscillation frequencies with reduced mass, as the embedded coil creates a more concentrated and effective magnetic field interaction zone
3Area of moving object
If the coil is placed on the movable element, then the electromagnetic actuation is achieved, but the reflective surface area is reduced
Solution Approach 1:
The patent utilizes the third dimension by embedding the coil within the movable element's structure rather than placing it on the surface. This embedded configuration allows the magnetic field interaction to occur volumetrically throughout the movable element, maximizing the interaction area between the coil and magnetic field while minimizing the surface area occupied by magnetic components
Solution Approach 2:
The patent applies the nesting principle by integrating the coil structure within the movable element's body, similar to placing one object inside another. The coil is embedded within the movable element's substrate, allowing the reflective surface to extend over the entire external surface while the coil resides within the internal structure, thus maintaining maximum reflective area while enabling electromagnetic actuation
4Area of moving object
If the magnet is placed on the fixed part and coil on the movable element, then the reflective surface area is maximized, but manufacturing constraints prevent uniform coil provision
Solution Approach 1:
The patent changes the physical configuration parameters by embedding the coil within the movable element's structure rather than placing it on the surface. This parameter optimization allows for enhanced magnetic field interaction efficiency, enabling higher oscillation frequencies with reduced mass, as the embedded coil creates a more concentrated and effective magnetic field interaction zone
Solution Approach 2:
The patent utilizes the third dimension by embedding the coil within the movable element's structure rather than placing it on the surface. This embedded configuration allows the magnetic field interaction to occur volumetrically throughout the movable element, maximizing the interaction area between the coil and magnetic field while minimizing the surface area occupied by magnetic components
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 the brightness of projected images by maximizing light reflection and allowing higher oscillation frequencies with reduced power, while maintaining a smaller device size and minimizing mechanical stress.
Implementation Method 1
a magnetic element which is secured to a fixed part of the reflective device; one or more electrically conductive means positioned on the movable element so that one or more electrically conductive means can operatively co-operate with a magnetic field provided by the magnetic element to effect oscillation of the moveable element
Data Source
AI summary
A reflective device comprising, a comprising, a movable element which comprises a reflective surface, wherein the movable element can oscillate about at least one oscillation axis to scan light; one or more holder elements which co-operate with the movable element to hold the movable element in a manner which will allow the movable element to oscillate about the at least one oscillation axis to scan light, wherein the one or more holder elements are configured to define a region which can receive at least a portion of the movable element as the movable element oscillates when the reflective device is mounted on a surface; a magnetic element which is secured to a fixed part of the reflective device; one or more electrically conductive means positioned on the movable element so that one or more electrically conductive means can operatively co-operate with a magnetic field provided by the magnetic element to effect oscillation of the moveable element, wherein the one or more electrically conductive means are completely embedded in the movable element. There is further provided a projection device having such a reflective device and a corresponding method of manufacturing a reflective device.