Wireless Mechanical Shutter Using Stationary Coil and Magnetic Damping
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Solution Overview
Problem
Existing high-speed electro-mechanical shutters suffer from wire fatigue due to repeated flexure of coil attachment wires, limiting their lifetime and requiring electrical attachment, which makes them less reliable and more expensive to build.
Innovation Solution
A design featuring a moving payload of magnets with no attached wires, utilizing a stationary coil and permanent magnets for propulsion, along with copper damping for oscillatory control, eliminating the need for electrical attachment and reducing wire fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a moving coil with electrical attachment is used, then the shutter can achieve fast movement and control, but the wire fatigue from repeated flexure limits the lifetime and reliability
Solution Approach 1:
The patent extracts and removes the electrical attachment wires from the moving coil assembly, leaving only the stationary coil structure. This eliminates the wire fatigue problem caused by repeated flexure during shutter operation, thereby improving reliability and lifetime while maintaining fast shutter speed through the stationary coil's magnetic field control
Solution Approach 2:
The patent replaces the traditional moving coil mechanical system with a stationary coil system that uses magnetic field interaction to achieve shutter movement. This substitution eliminates the mechanical wear and wire fatigue associated with moving electrical connections, improving reliability while maintaining the electro-mechanical actuation capability
2Ease of operation
If a moving coil with electrical attachment is used, then the shutter can be actuated, but the electrical attachment increases device complexity and cost
Solution Approach 1:
The patent extracts and removes the complex electrical attachment wiring from the moving assembly, simplifying the device structure. The stationary coil configuration reduces the number of electrical connections and mechanical attachment points, thereby reducing device complexity and manufacturing cost while preserving full actuation capability through magnetic field control
3Ease of operation
If a moving coil with electrical attachment is used, then the shutter can be controlled, but the wire fatigue reduces reliability
Solution Approach 1:
The patent extracts and removes the vulnerable wire attachment components from the moving assembly. The stationary coil design eliminates repeated wire flexure during shutter operation, thereby improving reliability while maintaining precise control capability through the magnetic field generated by the stationary coil
Solution Approach 2:
The patent employs a design where the stationary coil structure serves as a durable, long-lasting component without vulnerable wire attachments that would require replacement. This eliminates the need for periodic maintenance or replacement of fatigue-prone wire connections, improving reliability while maintaining control functionality
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 achieves desired performance specifications, including fast shutter speed and long lifetime, while being physically smaller, cheaper, and more reliable, with improved cleanliness and reduced risk of particle generation.
Implementation Method 1
a moving payload consisting of magnets with no wires attached... utilize a permanent magnet for the upward propulsion of the payload
Implementation Method 2
Eddy current damping provided by copper interacting with the payload magnets is included to damp the oscillatory transient response of the payload
Data Source
AI summary
An electro-mechanical device includes a payload of a magnet affixed to a mirror, and a coil assembly. The coil assembly has a body with wound electrically conducting wires and a payload aperture through which the payload travels. When voltage is applied to the coil assembly, current through the coil assembly generates a magnetic field resulting in a net upward force on the magnet that accelerates the payload to travel upward through the payload aperture for the mirror to block an optical pulse. As the magnet travels through the payload aperture, due to a magnetization direction of the magnet and a magnetic field in an upper portion of the coil assembly, the magnet experiences a net deceleration force that arrests the payload.