Reflection Drive Assembly With Integrated Magnetic Angle Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Camera modules with telephoto camera functions require a longer focal length, leading to increased length, necessitating a reflection module to fold the optical path, which requires closed-loop control of the reflection element's position.
Innovation Solution
A reflection drive assembly with a reflection base, carrier, and rotation magnets/coils for adjusting the reflection element's position, combined with sensing magnets/elements for precise angle detection, enabling closed-loop control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a reflection module is added to fold the optical path, then the camera module length is reduced, but the device complexity increases
Solution Approach 1:
The sensing part is integrated within the drive part structure. The first sensing magnet is positioned on the carrier adjacent to the second rotation magnet, and the first rotation sensing element is arranged to sense both magnets' fields. This nested integration allows the sensing function to be embedded within the existing drive structure, adding sensing capability without proportionally increasing overall device complexity.
Solution Approach 2:
The first rotation sensing element is designed to simultaneously sense the magnetic fields of both the first sensing magnet and the second rotation magnet. This multi-functional sensing capability allows a single sensing element to perform multiple detection functions, reducing the total number of sensing components needed and thereby managing device complexity while achieving comprehensive position sensing.
2Reliability
If closed-loop control is implemented for the reflection element, then the imaging function is improved, but the device complexity increases
Solution Approach 1:
The sensing part provides real-time position feedback of the reflection element through magnetic field detection. The first rotation sensing element detects the rotation angle by sensing the magnetic fields of the first sensing magnet and second rotation magnet, and this feedback information is used to achieve closed-loop control of the reflection module, improving imaging reliability while managing system complexity through intelligent control.
Solution Approach 2:
The patent replaces complex mechanical position detection mechanisms with a magnetic field-based sensing system. By using magnets and magnetic sensing elements, the system achieves precise position detection without complex mechanical linkages, encoders, or other traditional position sensing mechanisms, thereby reducing overall device complexity while enabling closed-loop control.
3Measurement precision
If multiple magnets are arranged for sensing and driving, then the position sensing precision is improved, but the device complexity increases
Solution Approach 1:
The first sensing magnet and second rotation magnet are positioned adjacent to each other on the carrier, forming a combined magnetic field source. The first rotation sensing element is arranged to simultaneously sense both magnets' fields, merging their magnetic field effects to improve position sensing precision. This combining approach allows dual-magnet precision sensing without requiring separate sensing systems for each magnet.
Solution Approach 2:
The first sensing magnet acts as an intermediary element that works together with the second rotation magnet to enhance the magnetic field signal for sensing. By introducing this additional magnet, the system improves the magnetic field distribution and signal strength for the sensing element, thereby improving position detection precision without requiring direct mechanical contact or complex sensing mechanisms.
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
Accurate sensing and control of the reflection element's position, allowing for compact camera module design and improved imaging functionality.
Implementation Method 1
a second rotation magnet and a second rotation coil arranged opposite to each other, wherein the second rotation magnet and the second rotation coil are arranged to cooperate to drive the carrier to rotate
Implementation Method 2
a first rotation sensing element arranged to simultaneously sense magnetic fields of the first sensing magnet and the second rotation magnet
Data Source
AI summary
A reflection drive assembly includes a reflection base, a carrier rotatably disposed on the reflection base for carrying a reflection element which is arranged to reflect light propagating in a direction parallel to a first axis to propagate in a direction parallel to a second axis; a reflection drive part including a second rotation magnet and a second rotation coil arranged opposite to each other for driving the carrier to rotate with respect to the reflection base around a third axis which is perpendicular to the first axis and the second axis; and a rotation position sensing part including a first sensing magnet and a first rotation sensing element arranged to detect a rotation angle of the carrier around the third axis, wherein the first rotation sensing element is arranged to simultaneously sense magnetic fields of the first sensing magnet and the second rotation magnet.