Aperture Module Closed-Loop Control for Lens Stabilization
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Solution Overview
Problem
Existing camera modules face challenges in accurately adjusting the aperture and lens position to compensate for changes in light conditions and image stabilization, leading to potential image quality degradation due to hand-shake and focus issues.
Innovation Solution
A camera module incorporating an aperture module with a magnet, coil, and position detector, driven by a driver that generates compensation signals to adjust the lens barrel and aperture based on feedback and input signals, utilizing closed-loop control and PID controllers for precise positioning and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an actuator is added for optical image stabilization, then image stabilization capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the aperture module and lens barrel into a single integrated assembly where the aperture is coupled to the lens barrel. This merging reduces overall device complexity while maintaining image stabilization capability through the integrated structure that moves together in response to hand-shake detection.
Solution Approach 2:
The lens barrel serves multiple functions: it houses the optical lenses for image capture and simultaneously acts as a stabilization element that moves in response to hand-shake. The aperture module also serves dual purposes by controlling light intake and being integrated into the stabilization mechanism, reducing the need for separate dedicated components.
2Measurement precision
If closed-loop control with position detector is implemented, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a closed-loop control system where the position detector continuously monitors the magnet's position and provides feedback to the driver. The driver compares the feedback signal with the input signal to calculate error and generate corrective driving signals, achieving high positioning precision through continuous feedback adjustment.
Solution Approach 2:
The system performs self-correction by automatically detecting position errors through the position detector and magnet arrangement, and the driver autonomously generates compensation signals to correct deviations without external intervention, maintaining precision while minimizing the need for additional control components.
3Manufacturing precision
If compensation signal generation is added to account for lens barrel position changes, then aperture control accuracy is improved, but device complexity increases
Solution Approach 1:
The driver receives feedback about the lens barrel's current position (either from the position detector detecting magnet position or from an actuator/gyro sensor) and generates compensation signals based on the deviation from the neutral position. This feedback mechanism ensures the aperture maintains accurate control despite lens barrel movement.
Solution Approach 2:
The system proactively generates compensation signals before aperture control errors become significant by continuously monitoring lens barrel position and preemptively adjusting the aperture position to counteract anticipated deviations, maintaining accuracy without requiring complex real-time correction 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
The solution enables precise control of the aperture and lens position, improving image quality by compensating for changes in light conditions and stabilizing images against hand-shake, thereby enhancing the overall performance of the camera module.
Implementation Method 1
a coil disposed opposite to the magnet
Implementation Method 2
a position detector detecting a position of the magnet to generate a feedback signal
Data Source
AI summary
A camera module includes a lens barrel; an actuator driving the lens barrel in a direction perpendicular to an optical axis; and an aperture module adjusting an amount of light incident in the lens barrel. The aperture module includes an aperture coupled to the lens barrel, a magnet provided on one side of the aperture, a coil disposed opposite to the magnet, a position detector detecting a position of the magnet to generate a feedback signal, and a driver comparing an input signal indicating a target position of the magnet with the feedback signal to calculate an error value and generating a driving signal according to the calculated error value. The driver compares a current position of the lens barrel with a neutral position of the lens barrel to generate a compensation signal and compensates for one of the input signal and the feedback signal based on the compensation signal.