Magnetic Focus Actuator With Inductive Braking for Vibration Stability
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Solution Overview
Problem
Existing focusing devices struggle to quickly reach and maintain the desired focusing position, especially under conditions of knocks or vibrations, often requiring complex electronic driving systems that can lead to undesired resonance phenomena.
Innovation Solution
A focusing device featuring a magnetic actuator with a permanent magnet and electrical windings, where a second winding is short-circuited to generate a braking force opposing movement, allowing quick stabilization and maintaining focus without the need for electronic feedback, thus avoiding resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic feedback control is used to adjust focusing position, then focusing precision is improved, but device complexity increases and resonance phenomena occur
Solution Approach 1:
The patent removes the electronic feedback control system from the focusing mechanism. Instead of using complex electronic driving with feedback loops that cause resonance, the invention extracts only the essential function of position adjustment by using a simple motor-driven mechanism with mechanical stop positions, thereby eliminating resonance while maintaining focusing capability.
Solution Approach 2:
The system uses the motor's own characteristics and mechanical positioning elements (stops, detents) to achieve precise focusing without external feedback control. The motor unit works autonomously with mechanical constraints to maintain focus position, eliminating the need for complex electronic feedback systems.
2Adaptability or versatility
If motor unit is added to adjust focusing distance, then focusing adaptability is improved, but device complexity and resonance risk increase
Solution Approach 1:
The motor unit serves multiple functions: it adjusts the optical assembly position for focusing, and through the magnetic actuator mechanism, it also stabilizes the optical image against vibrations. This multi-functionality reduces the need for separate stabilization mechanisms, simplifying the overall system while maintaining adaptability.
Solution Approach 2:
The system dynamically adjusts the optical assembly position along the optical axis using the motor unit, enabling continuous focusing distance adjustment. The magnetic actuator provides dynamic stabilization by counteracting vibrations, allowing the system to adapt to different focusing distances and environmental conditions without increasing complexity.
3Stability of the object's composition
If optical assembly is stabilized against vibrations, then image stability is improved, but device complexity increases
Solution Approach 1:
The patent combines the focusing adjustment function and the vibration stabilization function into a single integrated magnetic actuator system. The motor unit that adjusts focusing distance also provides stabilization through magnetic fields, merging two functions into one mechanism and reducing overall system complexity while improving image stability.
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
Enables rapid and stable focusing with reduced complexity, preventing unwanted vibrations and resonance, by using electromagnetic induction to control the optical assembly's position effectively.
Implementation Method 1
at least one second electrical winding integrally associated with the other one of the optical assembly and the support structure and configured to be short-circuited so as to generate, due to the electromagnetic induction generated by the relative motion between said at least one permanent magnet and said at least one second electrical winding, a braking force that opposes the movement of the optical assembly along said moving direction
Implementation Method 2
at least one first electrical winding integrally associated with the other one of the optical assembly and the support structure and configured to cause flowing of an electric current within it, wherein the electrical current interacts with said at least one permanent magnet and causes the movement of the optical assembly along said moving direction
Data Source
AI summary
A device for focusing a light beam comprises a optical assembly comprising at least one focusing lens and/or mirror, a support structure which supports the optical assembly, a magnetic actuator configured to move the optical assembly with respect to the support structure along a moving direction substantially parallel to an optical axis (X) of the optical assembly and at least one position sensor configured to provide an indication of the position of the optical assembly with respect to the support structure. The magnetic actuator comprises at least one permanent magnet integrally associated with the optical assembly and at least one first electrical winding integrally associated with the support structure and configured to cause flowing of an electric current within it, wherein the electrical current interacts with said at least one permanent magnet and causes the movement of the optical assembly along said moving direction until the optical assembly is brought to a desired focusing position. The focusing device comprises at least one second electrical winding integrally associated with the support structure and configured to be short-circuited so as to generate, due to the electromagnetic induction generated by the relative motion between said at least one permanent magnet and said at least one second electrical winding, a braking force that opposes the movement of the optical assembly along said moving direction.