|
KMID : 1011420210260040275
|
|
Journal of Korean Ophthalmic Optics Society
2021 Volume.26 No. 4 p.275 ~ p.279
|
|
|
Newton Ring Tolerance Conversion Program
|
|
Kim Jeong-Mee
|
|
|
Abstract
|
|
|
Purpose: To develop a program that converts the Newton ring tolerance used in lens fabrication into the numerical tolerance of the radius of curvature and diopter tolerance.
Methods: Using the formula of the Newton ring interferometer and the program language of RAD Studio 11, a program was developed to convert the Newton ring tolerance used for lens surface manufacturing process into the numerical tolerance of the radius of curvature and diopter tolerance.
Results: This program was applied to the fabrication tolerance in the lens drawing for the diamond turning machine (DTM) processing of a general lens and the measurement tolerance of the contact lens mold. When the radius value of curvature, value of effective diameter, number of allowed Newton rings, and the refractive index of the lens were input, it was confirmed that a numerical tolerance range, a % range of numerical tolerance, and a diopter tolerance range were output, which could greatly help lens makers' tolerance-analysis-work.
Conclusions: Since the program of this paper describes how many Newton ring tolerances are equal to the fabrication tolerance of the DTM and the measurement tolerance of the 3D non-contact measuring device in the quality control (QC) of the contact lens mold, it is judged to be a very helpful program for the tolerance analysis work of lens makers who judge the degree of tolerance by the number of Newton ring interference fringes.
|
|
|
KEYWORD
|
|
|
Tolerance of Newton ring, Tolerance of radius of curvature, Diopter tolerance, Numerical tolerance, Contact lens mold
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|