Diaphragm Mechanism Control for Autofocus Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In imaging devices with a diaphragm mechanism, autofocus control accuracy decreases in dark environments due to insufficient light, leading to reduced distance measurement accuracy.
Innovation Solution
An imaging device with an autofocus control unit and a diaphragm mechanism control unit that adjusts the diaphragm mechanism based on the amplification factor of the distance measurement signal during autofocus operations, opening the diaphragm to maximum when the amplification factor exceeds a predetermined value to suppress noise and ensure sufficient light reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diaphragm mechanism maintains a diaphragm value according to imaging setting during autofocus control, then the imaging setting is preserved, but distance measurement accuracy decreases in dark environments due to insufficient light reception
Solution Approach 1:
The diaphragm mechanism dynamically adjusts its diaphragm value during autofocus control based on the amplification factor of the distance measurement signal. When the amplification factor exceeds a threshold indicating insufficient light, the diaphragm opens to a predetermined value to increase light reception. This dynamic adjustment resolves the contradiction by allowing the system to deviate from the fixed imaging setting when necessary for accurate autofocus.
Solution Approach 2:
The system changes the diaphragm value parameter during autofocus operation based on real-time evaluation of the amplification factor. By monitoring the signal characteristics and adjusting the diaphragm opening accordingly, the system optimizes light reception to ensure accurate distance measurement while maintaining control over the imaging parameters.
2Measurement precision
If the diaphragm mechanism opens to increase light reception in dark environments, then distance measurement accuracy improves, but noise components increase
Solution Approach 1:
The system uses feedback from the amplification factor of the distance measurement signal to control diaphragm adjustment. By monitoring the signal quality and only opening the diaphragm when the amplification factor exceeds a threshold, the system ensures that light reception is increased only when genuinely needed for accurate measurement, thereby minimizing unnecessary noise introduction.
Solution Approach 2:
The diaphragm value is adjusted based on the amplification factor parameter. When the amplification factor indicates insufficient light (exceeds threshold), the diaphragm opens to increase light reception and improve signal quality. When the amplification factor is within acceptable range, the diaphragm maintains its imaging setting value, avoiding unnecessary opening that would introduce noise.
3Manufacturing precision
If the diaphragm mechanism is controlled based on imaging setting, then the imaging quality is maintained, but autofocus control accuracy decreases when light reception is insufficient
Solution Approach 1:
The diaphragm control system operates in two dynamic modes: during normal operation, it maintains the imaging setting value to preserve image quality; during autofocus control, it dynamically adjusts based on the amplification factor to ensure accurate distance measurement. This dual-mode dynamic control resolves the contradiction by prioritizing different parameters at different operational stages.
Solution Approach 2:
The system performs preliminary evaluation of the amplification factor before executing autofocus control. By assessing the light reception condition in advance, the system can proactively adjust the diaphragm to ensure sufficient light for accurate distance measurement, preventing autofocus accuracy degradation before it occurs.
Data Source
AI summary
An object is to improve accuracy of autofocus control. Accordingly, an imaging device according to the present technology includes an autofocus control unit that performs operation of autofocus according to a predetermined manipulation, and a diaphragm mechanism control unit that performs opening and closing control of a diaphragm mechanism according to an amplification factor of a distance measurement signal during the operation of autofocus. Thus, during the operation of autofocus, control different from control of the diaphragm mechanism based on an imaging setting is performed, and accuracy of the autofocus control is improved.