Abstract
The phenomenon of residual stress in optical lens injection molding affects the quality of optical devices, with the refractive errors that are caused by geometric errors being the most serious, followed by the reduced accuracy and function of optical components; it is very important to ensure that the lens geometry remains intact and that the refractive index is reduced. This paper uses a photoelastic stress compensation method for measurement verification along with fuzzy theory to reorganize a set of processes that can be used to evaluate the residual stress of a product, whereby the use of corresponding theoretical formulas can effectively quantify and measure the residual stress of the product. A mold flow simulation is used to analyze the molded optical components and determine the feasibility of evaluating the quality of the lens. Through the measurement of the refractive stress value of the optical components, the molding quality of the lens can be improved, and its force distribution effects can be investigated. Geometric analysis and shear stress affect the performance of optical components, and these errors may also cause irreparable problems during secondary processing. Therefore, it is crucial to reduce the residual stress of optical components. When the stress distribution is uniform and the internal melting pressure is reasonably configured, the product’s shrinkage rate can be controlled; the method for determining the residual stress is the core theme of this research.
Highlights
Common optical components of optical lenses can be divided into two types: optical glass and optical lenses
In 1998, Yoneyama and Takashi [3] proposed a new two-dimensional photoelastic analysis method for determining the fringe order and the main direction of birefringence from a single image combined with elliptically polarized white light and color image processing
This paper considers the determination of membrane residual stress in a glass plate through automatic digital photoelasticity (RGB photoelasticity) under white light
Summary
Common optical components of optical lenses can be divided into two types: optical glass and optical lenses. Process optimization is the key factor to accurately control the quality of the injected polymer, such as the accuracy of the size and the material’s mechanical properties. This research mainly discusses injection molding plastic processing to form optical lenses. Injection molding is a one-time forming technology that is low cost, high speed, has a stable yield, and high production efficiency. The injection of polymer material optical products has the same shrinkage and warpage deformation problems as general injection molded components, with the additional issues of optical refraction, including the relationships between the radius of curvature, the residual flow stress, birefringence, mold temperature, injection temperature, and injection speed, all of which must be improved to reach a better accuracy and yield. A method to effectively determine the residual birefringence in the injection molded part is the core goal of this article
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