Lens Focus Adjustment via Operation Time Lookup Table
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile devices experience decreased focusing accuracy due to increased temperature from prolonged use, which broadens the focus range and affects image quality.
Innovation Solution
A method and apparatus that utilize a processor, motor, and driver to adjust the distance between the lens and image sensor based on a calculated focus range derived from a relationship table, where the processor obtains operation time and sends the focus range to the driver to control the motor, ensuring precise focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the photographing device operates for a long time, then the processing capability is maintained, but the temperature increases and focusing accuracy deteriorates
Solution Approach 1:
The system pre-establishes a relationship table mapping operation time to focus range adjustments. Before temperature actually affects focusing, the processor proactively queries operation time, retrieves corresponding focus range data from the table, and pre-adjusts the focus range to compensate for anticipated thermal expansion effects, thereby maintaining focusing accuracy during prolonged operation
Solution Approach 2:
The system implements a feedback loop where the processor continuously monitors operation time, queries the relationship table for current focus range parameters, and adjusts the focus range dynamically. This closed-loop control compensates for temperature-induced focusing drift by continuously adapting the focus range based on accumulated operation time
2Reliability
If the focus range is adjusted to compensate for temperature, then focusing accuracy is maintained, but the device complexity increases
Solution Approach 1:
The relationship table between operation time and focus range is pre-computed and stored during device manufacturing or initial setup. This eliminates the need for complex real-time calculations during operation, as the processor simply queries pre-established data from the table, thereby maintaining focusing accuracy without adding significant computational complexity
Solution Approach 2:
The system replaces complex real-time thermal modeling and calculation mechanisms with a simple lookup table approach. Instead of implementing sophisticated algorithms to predict temperature effects, the system uses a straightforward time-to-focus-range mapping table that the processor queries directly, significantly reducing computational complexity while maintaining accuracy
Data Source
AI summary
Method and apparatus for enabling precise focusing are provided. The method includes obtaining an operation time of the photographing device in real time by a processor, searching a relationship table of preset times and focus range based on the obtained operation time to obtain a focus range corresponding to the obtained operation time; sending the obtained focus range to a driver by the processor, adjusting the distance between a lens and an image sensor based on the focus range by the driver, so that the lens may be located in the focus range, and to adjust the focus range in real time and improve the accuracy of focusing between the lens and the image sensor.