A kind of lens stress detection method

Abstract

The invention discloses a lens stress detecting method. The method comprises the following steps: 1, a uniform surface light source, a first circular polarizer, a second circular polarizer, an imaging lens and an imaging photosensitive element, and the imaging photosensitive element is connected with the computer; 2, the center of a lens is arranged on an optical path between the first circular polarizer and the second circular polarizer, and a light source passes through the first circular polarizer to change into circularly polarized light; after the circularly polarized light passes through the lens, the circularly polarized light carries the polarization information of the lens to change into elliptical polarized light; after the elliptical polarized light passes through the second circular polarizer, the elliptical polarized light is received by the imaging lens and is converged onto the imaging photosensitive element; the imaging photosensitive element transmits the polarization information of the lens to a computer; the computer quantifies and analyzes the polarization information of the lens to obtain a stress distribution diagram for representing the size of stress influence on the lens. The size of the stress influence on each area of the lens is represented by analyzing the stress distribution diagram of the lens, and an important reference basis is provided for detection of the quality of lens.

Description

technical field [0001] The invention belongs to the field of lens testing, and in particular relates to a lens stress detection method. Background technique [0002] Most of the lens materials currently on the market are resin eyeglass lenses. If there is no stress, the resin lens is an isotropic medium, and it does not have the birefringence effect of light. However, if the resin lens is under the action of stress, it becomes an anisotropic medium, and the light passing through the resin lens will produce light birefringence. If the birefringence of light occurs in the spectacle lenses, the imaging quality will be affected, and long-term wearing will make the wearer's eyes easily tired, dizzy, and affect vision. [0003] The stress of the lens mentioned in the previous paragraph comes from three aspects: 1. The lens material itself has internal stress. 2. During the assembly process of glasses, due to the external stress generated by the extrusion force of the frame, the...

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a method for lens stress detection, which aims to solve the problem that the lens stress test process is not fast and the stress detection results cannot be quantified; The problem that it is impossible to judge the stress effect on the frequently used area of ​​the lens due to inconvenient partitioning

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