Sensor-Shifting Camera Module Without Permanent Magnet Interference
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Solution Overview
Problem
Existing camera modules with optical image stabilization (OIS) face challenges in implementing effective OIS due to the magnetic fields generated by permanent magnets affecting neighboring electronic components, especially when multiple cameras are adjacent, complicating their disposition and operation.
Innovation Solution
A sensor shifting module utilizing a driving coil and a soft magnetic yoke for electromagnetic interaction to move the image sensor orthogonally, eliminating the need for permanent magnets and minimizing magnetic interference, with an elastic member providing restoring force and ball members for guided movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent magnet is used in the actuator for driving the image sensor, then excellent OIS compensation performance can be obtained, but the magnetic field of the permanent magnet affects neighboring electronic components and makes it difficult to dispose cameras adjacently
Solution Approach 1:
The patent extracts and removes the permanent magnet from the actuator system, replacing it with an electromagnetic actuator that uses a coil and magnetless magnetic circuit. This eliminates the source of magnetic field interference while preserving the OIS compensation function through electromagnetic force generation.
Solution Approach 2:
The patent replaces the permanent magnet-based magnetic system with an electromagnetic system using a coil and soft magnetic materials. This substitution eliminates the need for permanent magnets that generate harmful magnetic fields, while achieving the same mechanical movement of the image sensor through electromagnetic actuation.
2Adaptability or versatility
If multiple cameras are disposed adjacently to each other, then device integration is improved, but the permanent magnets in each camera negatively affect the operation of neighboring cameras
Solution Approach 1:
By removing the permanent magnet from the actuator design, the patent eliminates the harmful magnetic field source that would interfere with adjacent cameras. This enables multiple cameras to be disposed adjacently without magnetic interference, improving device integration and camera arrangement flexibility.
3Ease of operation
If a lens barrel is used for OIS, then a mechanical actuator can be implemented, but a relatively large amount of force is required to drive the lens barrel
Solution Approach 1:
The patent replaces the lens barrel-based OIS mechanism with an image sensor-driven OIS system using an electromagnetic actuator. This substitution reduces the driving force requirement because the image sensor is lighter than the lens barrel assembly, and the electromagnetic actuator can efficiently move the lighter sensor with minimal force.
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 effective optical image stabilization with reduced magnetic interference, allowing for efficient camera operation without affecting adjacent electronic components, thus improving camera module design and functionality.
Implementation Method 1
When current is applied to the driving coil, the first movable body is configured to move in the direction orthogonal to the first direction by electromagnetic interaction between the driving coil and the driving yoke
Implementation Method 2
an elastic member, disposed between the first movable body and the fixed body, configured to deform based on a movement of the first movable body with respect to the fixed body
Data Source
AI summary
A sensor shifting module includes a fixed body; a first movable body, movably disposed in the fixed body, comprising an image sensor having an imaging plane opposite to a first direction; and a driver, configured to move the first movable body in a direction orthogonal to the first direction with respect to the fixed body, comprising a driving coil coupled to one of the fixed body and the first movable body, and a driving yoke coupled to another of the fixed body and the first movable body. The driving yoke is disposed to oppose the driving coil in the direction orthogonal to the first direction. When current is applied to the driving coil, the first movable body is configured to move in the direction orthogonal to the first direction by electromagnetic interaction between the driving coil and the driving yoke.