A kind of laser cutting method of lens

Abstract

The invention discloses a laser cutting method for a lens. In the method, the lens is cut on a lens blank along a predetermined track by using laser light; the predetermined track comprises an internal cutting line of the lens defined on the lens blank and at least one external cutting line for further distinguishing scraps positioned at the periphery of the lens; one end of the external cutting line is connected with the internal cutting line, and the other end of the external cutting line extends out of the edge of the scraps; the depth of the predetermined track on the lens track is smaller than the thickness of the lens; and after cutting along the predetermined track is performed, the lens blank is cooled immediately and the scraps are cleared along the predetermined track. According to the method, expansion of the lens caused by heat absorption is released in the cutting process by using the external cutting line; the scraps are not cut, so that heat absorbed by the lens is not too high; and heat absorbed by the lens can be taken away in time in the cooling step, and the scraps can be cleared easily along the predetermined track.

Description

technical field [0001] The invention relates to the technical field of laser cutting, and more specifically, relates to a laser cutting method for lenses. Background technique [0002] The traditional way of cutting spectacle lenses is mainly mechanical hard contact processing, such as glass knife cutting, saw blade cutting, diamond cutting, etc. In the process of mechanical hard contact processing, the spectacle lens is prone to deformation due to relatively large mechanical stress. Especially for glass lenses, cracks may even occur during processing, causing the product to be scrapped. Since the mechanical processing method is difficult to realize automation, the processing speed is slow and the production efficiency is relatively low. [0003] The non-contact laser cutting process can make the spectacle lenses do not need to bear mechanical stress during the processing process. At the same time, the laser processing speed is fast, the precision is high, and the processi...

AI Technical Summary

Problems solved by technology

However, experiments have shown that when using laser cutting to process lenses, due to the unreasonable accumulation of heat during cutting and the restriction of the expansion of the lenses by the surrounding waste materials under the condition of heating, the probability of cracks in the lenses and the scrapping of the lenses is very high, which makes laser cutting spectacle lenses This option is directly ruled out by those skilled in the art

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