Prism Module Magnetic Field Detection for Slim OIS
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Solution Overview
Problem
Existing camera technologies face challenges in accurately detecting and compensating for hand tremble-induced vibrations, particularly in mobile devices, which affects the optical image stabilization (OIS) function and camera design, leading to reduced image quality and increased device thickness.
Innovation Solution
A prism apparatus with a dual prism module system, including a first and second prism module, each equipped with a sensor magnet supporter and hall sensor, that uses magnetic field detection to compensate for hand tremble by adjusting the angle of the prisms, allowing for precise optical image stabilization and a slim camera design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional camera module is used, then the basic photography function is achieved, but the device thickness increases and magnetic field detection precision is insufficient for effective OIS
Solution Approach 1:
The patent positions the sensor magnet on the yoke structure that extends perpendicular to the prism holder, creating a three-dimensional arrangement where the magnetic field detection occurs in a different spatial dimension. This allows the hall sensor to detect magnetic field changes caused by prism rotation without increasing the overall thickness of the camera module in the optical path direction.
Solution Approach 2:
The sensor magnet is integrated into the yoke structure, which itself is attached to the prism holder. The hall sensor is positioned within the magnetic field range of the sensor magnet, creating a nested arrangement where components are embedded within each other rather than being separately mounted, thereby reducing overall device thickness while maintaining detection precision.
2Area of stationary object
If the distance between sensor magnet and hall sensor is increased, then the detection range is improved, but the magnetic field detection precision decreases
Solution Approach 1:
The yoke structure is designed with specific geometric characteristics (width and height dimensions) that concentrate and guide the magnetic field lines from the sensor magnet toward the hall sensor. This creates a localized enhancement of magnetic field strength in the detection region, allowing for precise detection even when the sensor magnet and hall sensor are positioned at an optimal distance for adequate detection range.
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 effectively improves the accuracy of optical image stabilization and reduces device thickness by enabling precise angle compensation of the prisms, regardless of optical zoom, while maintaining image quality and enabling a slim camera form factor.
Implementation Method 1
a sensor magnet disposed above the yoke, a hall sensor spaced apart from the sensor magnet
Data Source
AI summary
A present disclosure relates to a prism apparatus, a camera apparatus and an image display apparatus including same. The prism apparatus according to one embodiment of the present disclosure includes a prism holder for fixing a prism to a first surface; a yoke of which a first surface is attached to a second surface of the prism holder which is rear surface of the first surface of the prism holder; a drive magnet attached to a second surface of the yoke which is rear surface of the first surface of the yoke; a sensor magnet disposed above the yoke; a hall sensor spaced apart from the sensor magnet; and a sensor magnet supporter to which the sensor magnet is attached. Accordingly, the magnetic field is detected accurately.