Stress relief process for ultraprecise optical resin lens

Abstract

The invention relates to the technical field of lens processing, in particular to a stress relief process for an ultraprecise optical resin lens. The stress relief process includes the step A of placing the resin lens in a cleaning basket, the step B of wrapping the cleaning basket containing the resin lens with a high-temperature-resisting preservative film, the step C of placing the wrapped cleaning basket in a dust-free oven to be baked for 3-5 hours at the temperature of 75-95 DEG C, and the step D of naturally cooling the cleaning basket in air after baking. As the resin lens is kept baking for 3-5 hours at the temperature of 75-95 DEG C, resin molecules are recombined, and internal stress is eliminated to the most extent; the detection result of an assembled lens under the modulation transfer function (MTF) shows that the internal stress of the optical resin lens is greatly reduced, the lens resolution yield is greatly increased, and practicability is high.

Description

technical field [0001] The invention relates to the technical field of lens processing, in particular to an optical ultra-precision resin lens stress-relieving process. Background technique [0002] At present, resin lenses are in a priority position in the competition of the glasses market because of their light weight, high transparency, impact resistance, easy molding, and dyeability. However, the crystallization conditions of the resin material are relatively strict. When it is injection molded into a lens, the resin often has an amorphous structure, and the molecular side properties are large, and orientation and solution are difficult to obtain. The internal stress of the molded lens is relatively large. During the molding process, when the temperature of the mold is low, the surface of the molten material cools and condenses quickly after entering the mold control, and the hot material enters the mold control continuously under the action of pressure, forming a mold b...

AI Technical Summary

Problems solved by technology

However, the crystallization conditions of the resin material are relatively strict. When it is injection molded into a lens, the resin often has an amorphous structure, and the molecular side properties are large, and orientation and solution are difficult to obtain. The internal stress of the molded lens is relatively large. During the molding process, when the temperature of the mold is low, the surface of the molten material cools and condenses quickly after entering the mold control, and the hot material enters the mold control continuously under the action of pressure, forming a mold between the cold material and the hot material. Most of these stresses are retained in the product with the cooling of the melt, and the injection molding of the resin pot is too fast during the injection molding process, resulting in inconsistent molecular orientation and internal stress, and if the speed is faster If it is low, it will be difficult to overcome the melt flow resistance, so that the gradually cooled melt in the mold cavity will shrink due to lack of timely replenishment, resulting in product defects and internal stress

[0003] However, there is internal stress in the optical lens, which will seriously affect the optical and mechanical properties of the lens, such as birefringence and cracking of the lens.

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