Imaging Camera Module Tilt Detection Using Magnetic Lens Sensing
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Solution Overview
Problem
Conventional methods for determining lens unit tilt in imaging systems suffer from inaccuracies, leading to poor peripheral image quality due to focus shift when the lens unit tilts, which can result in misjudgment and blurry images.
Innovation Solution
An imaging camera driving module with a lens unit, a driving mechanism, and a sensing mechanism that includes sensing magnets and elements to detect the tilt of the optical axis relative to the image surface, allowing for precise adjustment and correction of lens unit tilt, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image contrast examination is performed to obtain lens unit tilt, then peripheral image quality can be improved, but measurement precision deteriorates due to larger errors and misjudgment
Solution Approach 1:
The patent replaces the optical-based image contrast examination method with a magnetic field-based sensing mechanism. The sensing magnets and sensing elements directly measure the physical position and tilt of the lens unit through magnetic interaction, substituting the indirect optical measurement with a direct mechanical/magnetic measurement system that provides higher precision and eliminates the errors associated with image analysis.
2Loss of information
If lens unit tilt is detected through image analysis, then tilt information can be obtained, but device complexity increases due to the need for additional processing and examination systems
Solution Approach 1:
The patent extracts the tilt detection function from the complex image processing system and implements it as a separate, dedicated sensing mechanism using magnets and sensing elements. This isolated magnetic sensing system directly measures lens unit position and tilt without requiring image capture, processing, or analysis, thereby reducing overall system complexity while maintaining accurate tilt information acquisition.
3Measurement precision
If sensing magnets are positioned close to driving mechanism, then sensing precision is improved, but magnetic interference between sensing and driving mechanisms increases
Solution Approach 1:
The patent introduces the lens unit barrel as a magnetic shielding intermediary structure. The barrel is positioned between the sensing magnets (attached to the lens unit) and the driving mechanism, acting as a magnetic shield that blocks or attenuates the magnetic field lines. This allows the sensing magnets to be positioned close to the driving mechanism for high precision sensing while the barrel intermediary prevents harmful magnetic interference between the sensing and driving magnetic fields.
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 accurately detects lens unit tilt, enabling precise adjustments to enhance image quality by optimizing the capturing area and reducing assembly errors, resulting in clearer peripheral images.
Implementation Method 1
The sensing elements are disposed on an image side of the imaging lens assembly. Each of the sensing elements is disposed corresponding to one of the sensing magnets, and each of the sensing elements is configured to detect a relative position of the sensing magnet corresponding thereto.
Data Source
AI summary
An imaging camera driving module includes a lens unit, a driving mechanism, a sensing mechanism and an image surface. At least a part of the driving mechanism is coupled to the lens unit to drive the lens unit to move in a direction parallel to the optical axis. The sensing mechanism includes sensing magnets fixed to the lens unit and sensing elements not facing the driving mechanism. The sensing elements are disposed on an image side of the imaging lens assembly of the lens unit and corresponding to the sensing magnets. The sensing elements are configured to detect a relative position of the sensing magnets. The image surface is disposed on the image side of the imaging lens assembly, and the optical axis passes through the image surface. The sensing mechanism is configured to detect a tilt of the optical axis with respect to the central axis.