Lens Wavefront Measurement Without Second-Face Inversion
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Solution Overview
Problem
Existing lens measurement methods require measuring the shape of both faces of a lens sequentially, which prolongs the measurement time due to the need to invert the lens after measuring the first face.
Innovation Solution
A method and device that utilize a shape measurement unit to determine the center position of a lens's first face, position it in a transmission wavefront measurement unit based on a relative position, and measure the transmission wavefront to obtain optical characteristics, eliminating the need to measure the second face separately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the shape of both faces of the lens is measured sequentially, then the measurement completeness is improved, but the measurement time is prolonged
Solution Approach 1:
The patent extracts the measurement of the second face from the mandatory measurement sequence. By using the transmission wavefront measurement to obtain optical characteristics without directly measuring the second face shape, the patent removes the time-consuming inversion and remeasurement steps while still achieving complete optical characterization of the lens
Solution Approach 2:
The transmission wavefront measurement unit serves multiple functions: it characterizes the optical performance of the lens and indirectly provides information about both faces' combined effect. This multi-functional approach replaces the need for separate shape measurements of both faces, reducing measurement time while maintaining measurement completeness
2Measurement precision
If the lens is inverted to measure the second face, then the measurement accuracy is improved, but the operation complexity increases
Solution Approach 1:
The patent removes the lens inversion operation from the measurement process. By using transmission wavefront measurement, the system obtains optical characteristics without requiring the lens to be physically inverted, thereby eliminating the operational complexity of repositioning and re-fixing the lens
Solution Approach 2:
The transmission wavefront measurement acts as an intermediary method that bridges the gap between measuring both faces and obtaining complete optical characterization. Instead of directly measuring the second face shape through inversion, the wavefront measurement indirectly captures the optical effect of both faces, simplifying the operation
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
This approach significantly reduces measurement time by integrating shape and wavefront measurements, allowing for high-accuracy optical characteristic determination without inverting the lens, thus shortening the overall measurement process.
Implementation Method 1
Optical probe 102 measures a displacement amount by a triangulation method, and laser light emitted from sensor unit 106 is incident on objective lens 108 via reflection mirror 107 and applied to a surface of lens to be inspected 103
Implementation Method 2
a transmission wavefront measurement unit that measures a transmission wavefront of the lens
Data Source
AI summary
A surface shape of first face (8a) of lens (8) is measured with shape measurement unit (2) to determine a center position of first face (8a) of lens (8) from a measurement result, lens (8) is positioned in transmission wavefront measurement unit (3) based on the center position of first face (8a) of lens (8) and a relative position between shape measurement unit (2) and transmission wavefront measurement unit (3), a transmission wavefront of lens (8) is measured with transmission wavefront measurement unit (3), and an optical characteristic of lens (8) is obtained from the transmission wavefront.