Focus Adjustment Device Adaptive Speed Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing focus adjustment devices face inefficiencies in focus detection time due to incorrect determination of focus adjustable ranges based on focal distances, leading to prolonged search driving times in certain lens barrels.
Innovation Solution
A focus adjustment device with a driver, focus detector, and controller that dynamically adjusts driving speeds and ranges by comparing maximum and first driving speeds, allowing for adaptive focus detection operations to efficiently detect focus positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the focus adjustable range is determined based on focal distance, then the search driving manner can be predetermined, but the focus detection time increases when the actual focus adjustable range differs from the predicted range
Solution Approach 1:
The patent applies dynamics by transitioning from a static, predetermined search driving manner based on focal distance to a dynamic, adaptive search driving manner. The controller dynamically adjusts the search driving parameters (speed, range) based on real-time feedback from the focus detector and evaluation of focus status, allowing the system to adapt to actual lens barrel characteristics rather than relying on fixed predictions.
Solution Approach 2:
The patent implements feedback by using the focus detector to continuously monitor focus evaluation values and feed this information back to the controller. The controller evaluates the focus status based on this feedback and adjusts the search driving manner accordingly. This closed-loop feedback mechanism enables the system to correct its search strategy based on actual performance, reducing focus detection time when the actual focus adjustable range differs from predictions.
2Speed
If the second search driving is performed for large focal distances, then the search speed increases, but the focus detection time increases when the focus adjustable range is actually narrow
Solution Approach 1:
The system dynamically adjusts search driving parameters based on real-time focus evaluation feedback. When the focus detector indicates that the focus evaluation values do not change significantly within a certain range, the controller determines that the focus adjustable range is narrow and adjusts the search driving manner accordingly, avoiding unnecessary high-speed search operations that would waste time.
Solution Approach 2:
The feedback mechanism allows the system to continuously monitor focus evaluation values and adjust search driving speed based on actual focus status. When feedback indicates that further high-speed searching is unnecessary (because the focus range is narrow), the controller reduces search driving speed or terminates the search early, thereby reducing focus detection time while maintaining adequate search speed when needed.
3Measurement precision
If the first search driving is performed with focus detectable speed, then the focus position can be detected, but the search driving time increases when the focus adjustable range is actually wide
Solution Approach 1:
The system dynamically adjusts search driving parameters based on real-time feedback. When the focus detector indicates that focus evaluation values change significantly within a certain range, the controller determines that the focus adjustable range is wide and increases the search driving speed accordingly. This dynamic adjustment allows the system to maintain focus detection accuracy while reducing overall search driving time when the focus range is wide.
Solution Approach 2:
The patent applies parameter changes by modifying search driving parameters (speed, range) based on the evaluated focus status. When the focus adjustable range is determined to be wide, the controller changes the search driving parameters to use higher speeds and broader ranges, thereby reducing the time required to scan through the entire focus range while maintaining adequate detection accuracy.
Data Source
AI summary
The focus adjustment device is characterized by comprising: a driver 231 that drives a focus adjustment optical system 213 to change a focus status; a focus detector 170 that detects evaluation values with respect to contrast of images to perform focus detection for a optical system; an obtaining unit 170 that obtains a maximum driving speed among speeds with which the focus adjustment optical system is able to be driven; and a controller 170 that causes the driver to perform a first driving operation in which the focus adjustment optical system is driven within a certain range and with a certain speed or to perform a second driving operation which is different from the first driving operation, wherein the controller compares the maximum driving speed and a first driving speed as a driving speed for the focus adjustment optical system during the first driving operation with each other when a peak of the evaluation values fails to be detected within the certain range as a result of performing the first driving operation, and determines based on obtained comparison result whether or not to cause the driver to perform the second driving operation subsequently to the first driving operation.