Lens Test Device Multi-Distance Evaluation
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Solution Overview
Problem
Conventional lens testing devices can only test for either finite or infinite object distances without comprehensive consideration of a plurality of working distances, which is inadequate for lenses used in various mobile devices that require testing across multiple distances.
Innovation Solution
A lens testing method and device that calculates simulated characteristic values for different object distances using correction data, allowing for the determination of a lens's grade across multiple object distances by obtaining testing characteristic values for a first object distance and applying correction data to simulate values for a second object distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional lens testing device tests for only one object distance (finite or infinite), then the testing process is simple, but the lens quality assessment is incomplete for multi-distance applications
Solution Approach 1:
The patent changes the testing parameter from fixed object distance to variable object distances by using a movable test chart that can be positioned at different distances. The system measures lens characteristics at multiple object distances (finite and infinite) by adjusting the test chart position, thereby achieving comprehensive multi-distance lens assessment without requiring multiple separate testing systems
Solution Approach 2:
The patent creates a universal lens testing device that can test lenses for both finite and infinite object distances using a single integrated system. The movable test chart mechanism allows the same device to perform multiple testing functions (different object distances) that previously required separate dedicated testing devices
2Reliability
If separate testing devices are used for finite and infinite object distances, then comprehensive lens testing is achieved, but testing time and resource consumption increase
Solution Approach 1:
The patent merges the functionality of separate finite-distance and infinite-distance testing devices into a single integrated system. By combining the test chart, positioning mechanism, and measurement system into one device that can operate at multiple object distances, the patent eliminates the need for separate testing processes, thereby reducing testing time while maintaining comprehensive assessment reliability
Solution Approach 2:
The patent introduces dynamic positioning capability where the test chart can be moved between different object distances during the testing process. This dynamic adjustment allows the system to transition between finite and infinite distance testing modes within a single testing session, eliminating the need for separate static testing devices and reducing overall testing time
Data Source
AI summary
A lens testing method is disclosed which comprises the following three steps. First, test a lens under test to obtain a testing characteristic value of the lens under test for a first object distance. Second, provide a correction datum. Third, calculate a simulated characteristic value for a second object distance according to the testing characteristic value and the correction datum.