Lens Reference Surfaces for Accurate Surface Tilt Detection
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Solution Overview
Problem
Existing shape measurement methods for optical elements fail to accurately detect tilts in surfaces when measuring three-dimensional shapes, particularly when the surfaces are opposed in the thickness direction of the optical element.
Innovation Solution
A lens design with a common design axis for both surfaces, featuring a flange part with outer circumferential parts and reference surfaces that allow for precise measurement of surface tilts by using imaginary planes perpendicular to the design axis, enabling accurate detection of surface shapes and tilts through a measurement jig and three-dimensional scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional shape measurement methods are used for optical elements, then the measurement process can be performed, but the tilt in surfaces cannot be accurately detected
Solution Approach 1:
The optical element is segmented into multiple reference surfaces (first reference surface and second reference surface) located at different positions. By dividing the measurement reference system into multiple discrete surfaces, the patent enables independent tilt detection for each surface, thereby achieving accurate measurement of surface tilts that cannot be detected by conventional single-reference methods.
Solution Approach 2:
The patent introduces reference surfaces as intermediary elements between the measurement probe and the optical element surfaces. These reference surfaces serve as mediators that facilitate the detection of surface tilts by providing stable, known geometric references that the probe can measure, thereby enabling indirect but accurate tilt detection.
2Measurement precision
If multiple reference surfaces are provided at different positions, then surface tilt detection accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The reference surfaces are designed to serve multiple functions: they provide reference points for position measurement, reference planes for tilt detection, and geometric constraints for orientation determination. By making the reference surfaces multi-functional, the patent reduces the need for additional separate measurement features, thereby managing device complexity while maintaining high measurement precision.
Solution Approach 2:
The patent transitions from two-dimensional surface measurement to three-dimensional spatial measurement by introducing reference surfaces at different positions along the optical axis. This dimensional extension allows the measurement system to capture tilt information in multiple directions simultaneously, improving measurement precision without proportionally increasing structural complexity.
Data Source
AI summary
A lens includes a first surface, a second surface opposed to the first surface, a first outer circumferential part disposed at an outer circumferential side of the first surface, a second outer circumferential part disposed at an outer circumferential side of the second surface, three or more first reference parts provided to the first outer circumferential part, three or more second reference parts provided to the second outer circumferential part, and a first reference surface disposed at an outer circumferential side of the first outer circumferential part and the second outer circumferential part. The first surface and the second surface have a common design axis. A first imaginary plane including the first reference parts and a second imaginary plane including the second reference parts are perpendicular to the design axis respectively. The first reference surface extends in parallel to the design axis.