A device for measuring the yellowness of spectacle lenses

Abstract

The invention discloses a device for measuring the yellowness of spectacle lenses. The device can realize the real-time online detection of the yellowness of the spectacle lenses on the assembly line, and real-time screening of unqualified products. The device uses a detector to collect a wide spectrum at one time, which greatly shortens the detection time. The device adopts two methods of transmission and reflection to measure the yellowness of the spectacle lens, which increases the reliability and accuracy of the device. The lighting source of the device uses a homogenizer for uniform light, and at the same time adopts a pulsed lighting method, which is beneficial to the improvement of measurement accuracy. This device can realize the automatic screening of unqualified products, which greatly saves manpower. At the same time, if there are many unqualified products in the production line, an alarm will be issued in time to warn that the qualified rate of this batch of products is low, and it is necessary to check the quality of raw materials or optimize the processing parameters in time.

Description

Technical field [0001] The present invention relates to the field of spectacle lens detection, specifically to a device for measuring the yellowness of spectacle lenses. Background [0002] China is known as the "Kingdom of Glasses" in the world. According to a study by the World Health Organization, China's myopic population has exceeded 600 million, accounting for nearly half of the Chinese population. The myopia rate of high school students and college students has exceeded 70%, and the myopia rate of primary school students is close to 50%. China currently has one of the highest incidence of myopia in the world. [0003] The quality of the glasses directly affects the health of vision, so the national quality supervision department lists measuring equipment such as focal meters, refractive lenses and optometry machines as mandatory measuring instruments. The state has also issued a series of national standards to guide and regulate the production and processing of glasses. ...

AI Technical Summary

Problems solved by technology

These devices are difficult to detect transparent ophthalmic lenses with certain concave and convex surfaces

[0009] (2) The traditional detection process requires steps such as spectrometry, and the measurement time for a single sample is long, which cannot adapt to the modern assembly line production mode of ophthalmic lenses

[0010] (3) Due to the characteristics of the spectacle lens itself and the influence of the production environment, the influence of stray light in the background of the measurement of yellowness is particularly obvious, while the traditional detection cannot adapt to the real-time online detection application scene, and the reliability and accuracy are greatly reduced

[0011] (4) Traditional testing cannot screen unqualified products in real time, requiring a lot of manpower and material resources, which is time-consuming and laborious, which is not conducive to the modern production process

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