Camera Shutter Device Using Permanent Magnets for Vibration Stability
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Solution Overview
Problem
Existing shutter devices for camera modules rely solely on electromagnets to hold the shutter blade in position, which can lead to instability due to mechanical vibrations or oscillations when de-energized, causing the shutter blades to lift off and vibrate.
Innovation Solution
A shutter device design utilizing a frame with opposing supports and a linear sliding structure, where a displaceable permanent magnet is guided along the sliding structure, and rotatable permanent magnets connected to a rotary drive are used to securely hold the shutter blade in position through magnetic forces, even in a de-energized state, with the rotary drive limiting movement to 180° to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electromagnets are used to hold the shutter blade in position, then the shutter device can be operated with simple control, but the shutter blade becomes unstable due to mechanical vibrations or oscillations when de-energized
Solution Approach 1:
The patent replaces the purely electromagnetic holding mechanism with a hybrid system that uses permanent magnets to create a mechanically stable position. The permanent magnets on the shutter blade interact with the linear guide structure to provide passive stability, eliminating the vibrations and oscillations that occur when electromagnets are de-energized, while maintaining simple electromagnetic control for actuation.
Solution Approach 2:
The patent employs a composite approach by combining permanent magnets and electromagnets in the same system. The permanent magnets provide stable positional holding through their inherent magnetic field, while the electromagnets provide controllable actuation. This composite magnetic system resolves the contradiction between operational simplicity and stability.
2Reliability
If permanent magnets are added to the shutter blade, then stability against vibrations is improved, but the device complexity increases
Solution Approach 1:
The permanent magnets on the shutter blade serve multiple functions: they provide stable positional holding against vibrations, enable interaction with the linear guide's magnetic field for controlled movement, and work synergistically with the electromagnets. This multi-functionality justifies the addition of permanent magnets without proportionally increasing overall system complexity.
Solution Approach 2:
The patent merges the functions of permanent magnets and electromagnets into a unified actuation and holding system. The permanent magnets are integrated directly onto the shutter blade, combining their stabilizing function with the actuation mechanism, thereby reducing the need for separate components and minimizing overall complexity.
3Manufacturing precision
If the rotary drive limits movement to 180°, then the shutter blade positioning precision is improved, but the speed of operation decreases
Solution Approach 1:
The rotary drive operates in periodic cycles, rotating exactly 180° to positioned the shutter blade precisely in either the open or closed state. This limited periodic movement ensures accurate positioning while the rapid back-and-forth operation maintains high operational speed. The 180° limitation creates two stable equilibrium positions that ensure precise positioning.
Solution Approach 2:
The permanent magnets on the shutter blade provide self-service by maintaining stable positioning at the 180° limited positions without requiring additional active control. The magnetic interaction with the linear guide structure creates natural equilibrium points that hold the shutter blade precisely in position, eliminating the need for complex positioning mechanisms that would slow operation.
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 ensures the shutter blade remains securely in its positions without relying on electromagnet energy, preventing vibrations and maintaining stability, which is crucial for applications requiring precise temperature uniformity and image acquisition.
Implementation Method 1
guided by the action of magnetic forces along the linear sliding structure
Implementation Method 2
rotatable permanent magnets connected to a rotary drive are used to securely hold the shutter blade in position through magnetic forces
Data Source
AI summary
A camera shutter device having a shutter blade which moves abruptly between a first position, in which it covers a transmission zone present between the carriers, and a second position, in which it opens up the transmission zone. On the shutter blade, there is provided a slide body which includes a displaceable permanent magnet and which is guided on a linear guide, the ends of which are assigned a respective rotatable permanent magnet. By oppositely changing the polarization direction of the rotatable permanent magnets through 180°, the displaceable permanent magnet is pulled into the first or second position.