SMA Camera Motor Shielding Layout for Image Sensor Interference
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Solution Overview
Problem
Existing camera modules in mobile devices experience magnetic interference from electrical connection cables, affecting magnetic sensitive components like image sensors due to induced magnetic fields from low-frequency currents.
Innovation Solution
Incorporation of shape memory alloy (SMA) motors with magnetic isolation members, including multiple layers of magnetic isolation boards and edges, strategically positioned to minimize magnetic interference by creating a barrier between the SMA motor and image sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrical connection cables are used to connect the actuator to the control circuit, then the actuator can be driven by PWM signals, but the cables generate induced magnetic fields that interfere with magnetic sensitive components
Solution Approach 1:
The patent introduces magnetic isolation members (magnetic shielding plates) as intermediary elements between the actuator and the image sensor. These shielding plates are positioned strategically to block and redirect magnetic field lines, preventing the induced magnetic fields from the electrical cables from reaching the magnetic sensitive image sensor, thus resolving the contradiction between actuator driving capability and magnetic interference.
Solution Approach 2:
The patent extracts the magnetic isolation function from the overall structure by adding separate magnetic shielding plates. These dedicated components are specifically designed to handle the magnetic interference problem, separating the actuator driving function from the magnetic field management function, allowing each to be optimized independently.
2Object-affected harmful factors
If magnetic isolation members are added to reduce magnetic interference, then image sensor performance improves, but device complexity increases
Solution Approach 1:
The magnetic isolation members are designed to serve multiple functions: they provide magnetic shielding while also acting as structural support elements and maintaining precise positioning within the compact module. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving effective magnetic interference reduction.
Solution Approach 2:
The magnetic isolation members are nested within the existing compact module structure, utilizing the available space efficiently. The shielding plates are positioned between existing components (actuator and image sensor) without requiring significant expansion of the overall module size, thus minimizing the impact on device complexity.
3Object-affected harmful factors
If the first magnetic isolation member is placed closer to the image sensor, then magnetic interference is reduced, but light transmission path may be blocked
Solution Approach 1:
The first magnetic isolation member is designed with an asymmetric structure featuring a through-hole that is offset from the center. This asymmetric design allows the member to be positioned close to the image sensor for effective magnetic shielding while the through-hole ensures that the optical axis remains unobstructed, allowing light to reach the image sensor without being blocked by the magnetic isolation member.
Solution Approach 2:
The magnetic isolation member has different properties in different regions: the main body provides magnetic shielding, while the through-hole region allows light transmission. This local differentiation of properties (magnetic shielding in most areas, optical transparency in the through-hole area) enables the component to simultaneously address both magnetic interference reduction and light transmission requirements.
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
Significantly reduces magnetic interference to magnetic sensitive components, enhancing the performance and reliability of camera modules by maintaining image quality and reducing noise in captured images.
Implementation Method 1
a shape memory alloy SMA motor, where the SMA motor is accommodated in the camera housing, the SMA motor includes an SMA cable
Implementation Method 2
a first magnetic isolation member, where the first magnetic isolation member is disposed in parallel with the image sensor
Data Source
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AI summary
This application provides a camera compact module (200), a motor module (202), an SMA motor (205), and an electronic device (100). The camera compact module (200) includes: the SMA motor (205), a lens array (2022), a plurality of magnetic isolation members, and an image sensor (207). The SMA motor (205) is configured to move the lens array (2022); and the magnetic isolation member is located between the SMA motor (205) and the image sensor (207). Solutions provided in this application are conducive to reducing a degree of magnetic interference to a magnetic sensitive electronic component in the camera compact module (200).