Rolling Drive Mechanism for Shake Correction
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Solution Overview
Problem
Magnetic interference between the magnetic drive mechanisms on the inner and outer sides of a movable body in imaging apparatuses, such as those mounted on portable terminals or unmanned helicopters, causes instability in image capture due to unwanted magnetic attraction and interference with non-magnetic components.
Innovation Solution
A rolling drive mechanism is implemented with a driving coil on one body and a driving magnet on the other, both facing each other in the optical axis direction and positioned outside the radial direction, reducing magnetic interference and allowing for thin design without the need for additional shielding or counterweights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic drive mechanism is arranged on the outer side of the movable body for shake correction, then shake correction function is achieved, but magnetic interference occurs between the outer magnetic drive mechanism and the inner magnetic drive mechanism
Solution Approach 1:
The patent extracts the magnetic drive mechanism from the movable body and relocates it to the fixed body. Specifically, the coil is mounted on the movable body while the magnet is mounted on the fixed body, separating the magnetic field generation from the movable components to eliminate magnetic interference with inner drive mechanisms
Solution Approach 2:
The patent introduces a non-magnetic material between the outer magnetic drive mechanism and the movable body to shield and reduce magnetic interference. This intermediary material prevents magnetic field penetration while allowing mechanical transmission, resolving the conflict between shake correction and magnetic interference
2Power
If the inner case is made of magnetic material to serve as a yoke, then the inner magnetic drive mechanism works effectively, but the outer magnetic drive mechanism's magnetic field cannot be shielded causing magnet attraction and immobility
Solution Approach 1:
The patent extracts the magnet from the movable body and relocates it to the fixed body. The coil remains on the movable body while the magnet is fixed, eliminating the conflict between yoke functionality and magnet mobility by separating these two functions into different locations
Solution Approach 2:
Instead of making the movable body magnetic to shield the outer magnetic field, the patent inverts the approach by placing the magnet on the fixed body and using a non-magnetic material for the movable body, achieving shielding without compromising magnet mobility
3Object-affected harmful factors
If additional magnetic shielding materials are added to reduce magnetic interference, then magnetic interference is reduced, but the device complexity and size increase
Solution Approach 1:
The patent eliminates the need for complex shielding structures by extracting the magnet from the movable body and relocating it to the fixed body. This fundamental repositioning removes the source of magnetic interference rather than attempting to shield against it, simplifying the overall device structure
Solution Approach 2:
The patent replaces mechanical magnetic shielding materials with an electromagnetic field-based solution by repositioning the magnet and coil. The magnetic field is confined to where it is needed for drive operation, eliminating the need for additional shielding layers and reducing device complexity
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 effectively suppresses magnetic interference, maintains high accuracy in shake correction, and reduces the overall size of the unit in the optical axis direction while preventing stress on wiring and ensuring precise image stabilization.
Implementation Method 1
the rolling drive mechanism is provided with a driving coil mounted on one of the movable body and the fixed body, and a driving magnet mounted on the other
Data Source
AI summary
In a unit with shake correction function, a driving magnet and a driving coil which constitute a rolling drive mechanism are arranged on an outer side of a radial direction with respect to a disposition space for an optical module that is provided in a movable body. Therefore, since there is no need to arrange the disposition space and the rolling drive mechanism to be deviated from each other in an optical axis direction, it is possible to make the unit with shake correction function thin in the optical axis direction. Further, in the rolling drive mechanism, since the driving magnet and the driving coil face each other in the optical axis direction, a magnetic field of the rolling drive mechanism does not easily enter the disposition space for the optical module. Consequently, magnetic interference between the movable body and the rolling drive mechanism can be suppressed.