Integrated multi-surface system measurement and evaluation method

A comprehensive measurement, multi-surface technology, applied in the field of optical measurement, can solve problems such as high price and lack of versatility

Active Publication Date: 2017-08-25
FUDAN UNIV
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  • Description
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Problems solved by technology

At present, the measurement technology focuses on the measurement and quality evaluation of a single surface, including surface shape error, surface finish, etc.; although there are also optical equipment that can realize some parameters, such as lens center thickness, eccentricity and other parameters, but

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  • Integrated multi-surface system measurement and evaluation method
  • Integrated multi-surface system measurement and evaluation method

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Embodiment Construction

[0041]Taking a progressive lens as an example, the present invention will be further described in detail below. The front surface is a spherical surface, the back surface is a free-form surface, and the material is optical resin (PMMA). The front and back of the lens are measured in a unified coordinate frame by a three-coordinate measuring machine (CMM) to obtain surface data, such as Figure 5 shown. Using the developed algorithm, the process of systematic error analysis for progressive lenses is as follows: Figure 6 shown. First, the measurement data and design data of the front and back of the lens are imported into the algorithm ( Figure 6 (a)), and then perform translation matching adjustment based on space rigid body transformation ( Figure 6 (b)) and spherical-based exact data matching ( Figure 6 (c)), and the exact data matching adjustment based on the freeform surface, including the initial position adjustment ( Figure 6 (d)) and optimized adjustments ( F...

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Abstract

The invention belongs to the optical measurement technology field and particularly relates to an integrated multi-surface system measurement and evaluation method. The method comprises steps that firstly, surface three-dimensional coordinate data measurement of a multi-surface system under a unified coordinate framework is carried out, in combination with a multi-surface system design model, surface geometric characteristic calculation is carried out; secondly, surface geometric characteristic selection is then carried out, and optimum surface system matching is then carried out; lastly, surface system quality evaluation is carried out, including evaluation on a relative error of each surface, integral deviation, a single surface or a certain interests of surface. The method is advantaged in that multi-surface systems comprise progressive eyeglasses and free curved surface prisms, analysis evaluation on system errors and surface type errors of various complex curved surface and combined surface systems can be realized, and a series of parameter evaluations based on a thickness parameter are included.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, and in particular relates to a comprehensive measurement and evaluation method of a multi-surface system. Background technique [0002] A multi-surface system refers to a surface system composed of more than one surface. For example, a commonly used optical lens is composed of a front surface, a rear surface and a side surface; a prism used in a VR / AR system consists of three working surfaces and two positioning surfaces. face composition. Such as figure 1 shown. The final functional effect of various parts formed by multi-surface systems is closely related to the quality of these surfaces and the positional relationship between each surface. For example, the performance of an optical lens is not only related to the quality of a single surface, but also the relative position of the front and back, including thickness, eccentricity, tilt, distortion (non-rotating lens), etc., will a...

Claims

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Application Information

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IPC IPC(8): G01B21/04G01M11/02
CPCG01B21/04G01M11/025
Inventor 孔令豹
Owner FUDAN UNIV
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