Optical Shutter Blade Damping via Magnetic Friction
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Solution Overview
Problem
Conventional damping solutions for optical shutters with rotatable drive rings face issues such as material aging, uneven wear, and unwanted sticking, leading to reduced durability and increased costs due to complex designs.
Innovation Solution
An optical shutter apparatus utilizing a magnetic linkage member, an actuator, and a non-magnetic intermediate plate with a friction surface, where a magnet urges the linkage member against the friction surface to provide damping, reducing bounce and wear on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bumpers and springs are used for damping, then bounce is reduced, but material aging and uneven wear occur leading to reduced durability
Solution Approach 1:
The patent replaces conventional mechanical damping components (bumpers, springs) with a magnetic field-based damping mechanism. A magnet assembly generates a magnetic field that interacts with a conductive plate to produce eddy currents, which create a damping force opposing the motion of the drive ring. This substitution eliminates material aging and wear issues associated with mechanical contact components while maintaining effective bounce reduction.
Solution Approach 2:
The patent employs electromagnetic induction principles where the magnetic field interacts with the conductive plate to generate eddy currents. This electromagnetic damping mechanism provides contactless force transmission, eliminating wear and material degradation while maintaining reliable damping performance over extended periods.
2Reliability
If complex arrangements of springs and resilient members are used for damping, then bounce is corrected, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex mechanical damping components (springs, resilient members, bumpers) from the shutter system. Instead, it implements a simplified magnetic damping mechanism consisting of a magnet assembly and a conductive plate, significantly reducing the number of parts and simplifying the overall damping mechanism while maintaining effective bounce control.
Solution Approach 2:
The patent replaces the complex mechanical spring and bumper system with an electromagnetic damping system. The magnet assembly generates a magnetic field that interacts with the conductive plate to produce eddy currents, creating a damping force without mechanical contact. This substitution dramatically simplifies the damping mechanism structure while maintaining reliable bounce correction.
3Ease of operation
If high force transmission from a single solenoid is used to drive the rotatable drive ring, then blade synchronization is achieved, but wear on the ring and linkage components increases
Solution Approach 1:
The patent replaces the single high-force solenoid drive with a magnetic damping mechanism that works in conjunction with the drive system. The magnet assembly and conductive plate create eddy currents that provide damping force during blade synchronization, reducing impact forces and wear on the drive ring and linkage components while maintaining synchronized operation.
Solution Approach 2:
The patent implements a damping mechanism that provides cushioning force before impact occurs. The magnetic field continuously acts on the conductive plate during the drive ring's motion, creating a damping force that opposes and reduces impact forces on the linkage components, thereby reducing wear while maintaining synchronization capability.
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 effectively reduces or eliminates bounce in optical shutters, prolongs component lifespan, and simplifies design while maintaining high performance, making it cost-effective and suitable for both single and multi-blade shutter systems.
Implementation Method 1
a magnet positioned away from the friction surface of the intermediate plate and disposed to urge the linkage member against the friction surface of the intermediate plate
Implementation Method 2
an intermediate plate having a friction surface that comprises a non-magnetic material
Data Source
AI summary
An optical shutter apparatus has at least one shutter blade that is movable between a first position blocking at least a portion of an aperture and a second position spaced apart from the first position. A linkage member is coupled to the at least one shutter blade and has a magnetic material. An actuator is coupled to the linkage member and is energizable to translate the at least one shutter blade between the first and second positions. An intermediate plate has a friction surface of a non-magnetic material. A magnet positioned away from the friction surface of the intermediate plate is disposed to urge the linkage member against the friction surface of the intermediate plate.