Dual-Axis Camera Reflection Module with Differential Position Sensors
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Solution Overview
Problem
Camera modules in portable electronic devices face challenges in miniaturization due to the addition of features like automatic focus adjustment and optical image stabilizing, which increase the size and thickness of the device, and require accurate detection of a reflective member's position to maintain optical image stabilizing performance.
Innovation Solution
A camera module design incorporating a reflection module with a reflective member rotatable on two axes, featuring different sensitivity position sensors and driving portions to accurately position the reflective member, allowing for reduced device thickness while maintaining optical image stabilizing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functions such as automatic focus adjustment and optical image stabilizing are added to camera modules, then performance is improved, but the size and thickness of the camera module increase
Solution Approach 1:
The patent transitions from a single-axis rotation system to a dual-axis rotation system for the reflective member. By adding rotation capability around a second axis perpendicular to the first axis, the system achieves optical image stabilizing functionality without increasing the thickness of the camera module, as the additional degree of freedom is achieved through spatial reconfiguration rather than axial extension.
Solution Approach 2:
The patent employs a movable reflective member that can rotate around two axes to dynamically adjust the optical path. This dynamic configuration allows the system to compensate for image shake and achieve optical image stabilizing performance while maintaining a compact thickness, as the reflective member's position and orientation can be continuously adjusted within the existing spatial constraints.
2Reliability
If the reflective member is rotated to correct shake, then optical image stabilizing is achieved, but the reflection angle deviates from the required angle, deteriorating optical image stabilizing performance
Solution Approach 1:
The patent incorporates position sensors that detect the position of the reflective member and feed this information back to the control system. Based on the detected position, the system adjusts the rotation of the reflective member to maintain the correct reflection angle, thereby achieving accurate optical image stabilizing performance while compensating for any deviations caused by rotation.
Solution Approach 2:
The patent replaces purely mechanical position detection with sensor-based detection systems. By using position sensors to detect the reflective member's position and incorporating this information into the control mechanism, the system achieves more precise control of the reflection angle and improves optical image stabilizing performance beyond what mechanical alone could achieve.
3Measurement precision
If position sensors with different sensitivities are used to detect reflective member position, then accurate positioning is achieved, but device complexity increases
Solution Approach 1:
The patent employs position sensors with different sensitivities tailored to detect specific components of the reflective member's position. By assigning different sensitivity characteristics to sensors based on their specific detection requirements, the system achieves accurate positioning while avoiding the need for uniformly high-sensitivity sensors throughout, thereby managing overall system complexity.
Solution Approach 2:
The patent divides the position detection function into separate sensor systems, each responsible for detecting position changes along specific axes or with specific sensitivity requirements. This segmentation allows each sensor to be optimized for its specific task rather than requiring all sensors to meet the highest sensitivity requirements, thereby reducing overall device complexity while maintaining accurate positioning.
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 the miniaturization of camera modules by accurately positioning the reflective member, reducing device thickness, and enhancing optical image stabilizing performance through precise control of the reflection module's rotation.
Implementation Method 1
The first position sensor may be a Hall sensor
Implementation Method 2
The second position sensor may be a tunnel magnetoresistance (TMR) sensor
Implementation Method 3
The first driving portion may include a first magnet disposed on the reflection module and a first coil opposing the first magnet
Implementation Method 4
The second driving portion may include a second magnet disposed on the reflection module and a second coil opposing the second magnet
Data Source
AI summary
A camera module includes: a lens module including a plurality of lenses disposed along an optical axis; a housing accommodating the lens module; and a reflection module disposed in front of the lens module, and including a reflective member configured to change an optical path, and a holder in which the reflective member is mounted. The reflection module is rotatably disposed on a first axis and a second axis perpendicular to the optical axis. A first position sensor configured to sense a position change of the reflection module with respect to the first axis is disposed in the housing. A second position sensor configured to sense a position change of the reflection module with respect to the second axis is disposed in the housing. A sensitivity of the first position sensor is different from a sensitivity of the second position sensor.