OIS Camera Sensor Circuit for Magnetic Noise Filtering
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Solution Overview
Problem
Existing camera devices face challenges in miniaturization and noise interference from magnetic fields generated by OIS coils, affecting OIS control reliability and heat radiation efficiency.
Innovation Solution
A camera device design with a moving unit and stationary unit connected by a support board, incorporating capacitors connected to OIS position sensor terminals to reduce noise interference and improve heat radiation through heat radiating members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor is connected to the position sensor terminals, then noise from magnetic fields is reduced and OIS control reliability is improved, but device complexity increases
Solution Approach 1:
A capacitor is introduced as an intermediary component connected in parallel to the position sensor terminals. The capacitor acts as a mediator that filters out high-frequency noise from magnetic field interference while allowing the useful position signal to pass through, thereby improving OIS control reliability without fundamentally changing the sensor system architecture
Solution Approach 2:
The harmful magnetic field noise that interferes with position sensor measurement is converted into a beneficial filtering effect. By connecting a capacitor across the sensor terminals, the noise that would normally degrade performance is instead utilized to charge the capacitor, which then blocks this same noise from affecting the control system, transforming the harmful interference into a useful noise-filtering mechanism
2Volume of moving object
If the camera device is miniaturized, then portability is improved, but heat radiation efficiency deteriorates
Solution Approach 1:
Heat radiation is optimized at specific localized positions within the compact device structure. Heat radiating members are strategically positioned at locations where heat generation is highest (such as near the image sensor and processor), allowing efficient thermal dissipation from these critical hot spots while maintaining the overall miniaturized form factor of the camera device
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
Enhances OIS control reliability by reducing noise from magnetic fields and improves heat radiation efficiency, ensuring effective operation in miniaturized camera devices.
Implementation Method 1
remove noise included in an OIS position sensor output signal, which is attributable to a magnetic field generated by an OIS coil
Implementation Method 2
improve heat radiation efficiency and heat radiation performance
Data Source
AI summary
An Embodiment comprise: a moving unit comprising a first board and an image sensor disposed on the first board, a stationary unit including a second board which is spaced apart from the first board, a support board configured to support the moving unit such that the moving unit is movable in a direction perpendicular to an optical-axis direction relative to the stationary unit and to conductively connect the first board to the second board, a position sensor disposed on the first board so as to detect displacement of the moving unit, and a capacitor conductively connected to first and second output terminals of the position sensor.