VR光学模组镜片粘接用UV胶的选型研究  

Research on the selection of UV adhesive for VR optical module lens bonding

作　　者：李柯 宋浛瑜 刘美艳 陈文 刘朝红 饶轶 杨春 李吉印 Li Ke;Song Hanyu;Liu Meiyan;Chen Wen;Liu Chaohong;Rao Yi;Yang Chun;Li Jiyin(Goertek Optical Technology Co.,Ltd.,Weifang 261031,Shandong,China;Goertek Inc.,Weifang 261031,Shandong,China)

机构地区：[1]歌尔光学科技有限公司,山东潍坊261031 [2]歌尔股份有限公司,山东潍坊261031

出　　处：《中国胶粘剂》2024年第11期41-47,共7页China Adhesives

摘　　要：环烯烃共聚物(COC)常应用于VR产品镜片,具有低吸水率、超低应力的特点,然而COC材料的粘接难度高,对此类粘接问题的研究较少。为了更好地研究VR光学模组中UV胶选型的关键因子,本研究针对VR光学模组结构与Pancake镜片COC材质的特点,通过模拟VR光学模组的应用环境,在实验室设计了高温高湿、温度冲击两个关键条件。选取30款(G1~G30)市售不同厂家的UV胶水,检测了不同热膨胀系数、玻璃化转变温度(Tg)、韧性、低温下储能模量的胶水组装的模组在这些模拟条件下的耐久性能,并通过分析UV胶常温断裂伸长率、Tg等相关参数探究其与最终粘接效果的关系,以期为COC材质的镜片粘接胶水的实际选型和应用提供参考。研究结果表明:通过探究UV胶热膨胀系数、Tg点、韧性、低温下储能模量等4个关键因子,发现G2和G3含有零上和零下两个Tg点、低温下储能模量低(小于1000×10^(6) Pa),并具有较好的韧性(断裂伸长率大于400%,杨氏模量小于60×10^(6) Pa),可以抵抗冷热温度冲击,推力与光学性能表现良好。G2和G3可维持VR模组光学成像的稳定,并解决VR模组温冲试验中胶水开裂问题。本文为COC材质粘接的胶水提供一种可行的选型依据,在实际生产中有一定的指导意义。Cycloolefin copolymer(COC)is commonly used in VR product lenses,with the characteristics of low water absorption and ultra-low stress.However,the bonding difficulty of COC materials is high,and there is relatively little research on such bonding problems.In order to better study the key factors of UV adhesive selection in VR optical module,the characteristics of VR optical module structure and Pancake lens COC material were focused in this study.By simulating the application environment of VR optical modules,two key conditions of high temperature and humidity,and temperature shock were designed in the laboratory.30 kinds of UV adhesive(G1-G30)from different manufacturers were selected and tested for the durability of modules assembled with adhesive with different thermal expansion coefficients,glass transition temperature(Tg),toughness,and storage modulus at low temperature under these simulated conditions.And by analyzing the relevant parameters such as the elongation at break and Tg of UV adhesive at room temperature,the relationship between them and the final bonding effect were explored,in order to provide reference for the practical selection and application of COC material lens bonding adhesive.The research results showed that by exploring four key factors of UV adhesive,including thermal expansion coefficient,Tg point,toughness,and storage modulus at low temperature,it was found that G2 and G3 had two Tg points above and below zero,low storage modulus at low temperature(less than 1000×10^(6) Pa),and good toughness(elongation at break greater than 400%,Young's modulus less than 60×10^(6) Pa),which could resist cold and hot temperature impacts,and exhibited good thrust and optical performance.G2 and G3 could maintain the stability of VR module optical imaging and solve the problem of adhesive cracking in VR module temperature shock testing.A feasible selection basis for the adhesive of COC material bonding was provided in this article,which had certain guiding significance in practical production.

关 键 词：UV胶 VR模组 玻璃化转变温度 温度冲击 环烯烃共聚物 

分 类 号：TQ436[化学工程]