Development of Plastic Lenses for High-Resolution Phone Camera by Injection-Compression Molding

Abstract

This study aims to develop a plastic aspheric lens for a 13-megapixel mobile phone camera by injectioncompression molding. A mold for injection-compression molding experiments was fabricated with a movable upper plate and four springs. During cavity filling for an aspheric lens with a thickness ratio of 2, a weldline was formed under conventional injection molding, whereas no weldline was formed under injection-compression molding with a compression stroke of 0.3 mm. The flow patterns were in good agreement with the simulation results. The birefringence decreased as the compression stroke increased, and the birefringence produced by injection-compression molding was very low and more uniform compared with that produced by injection molding. In addition, the bulk birefringence of an assembly composed of four plastic lenses was significantly affected by the orientation of the lenses to be mounted.

Microfluidic-Based Single-Cell Study: Current Status and Future Perspective

“…Then, the melting polymer is injected into the microstructured mold under relatively high pressure. In order to get better replication results, vacuum-assisted injection molding, injection compression molding, and many other kinds of injection molding methods were developed [ 130 , 131 ]. Fourthly, after the melting polymer is fully filled into the microstructured mold, it should be cooled below the solidification temperature of the polymer within mold for structure definition.…”

Design of Lens Central Thickness Measuring Optical System

“…光学镜头在诸多领域中都有广泛的应用， 如工业检测、 安防监控、 国防军事等 [1][2][3][4] ， 而透镜中心厚度是光 学 镜 头 的 一 个 重 要 参 数 ， 其 对 光 学 镜 头 的 焦 距 以 及 光 学 系 统 的 成 像 质 量 均 有 较 大 影 响 。 数 码 镜 头 、 航 空 摄 像 镜 头 等 均 对 透 镜 中 心 厚 度 有 严 格 的 要 求 [5] 。 透 镜 中 心 厚 度 的 加 工 是 否 满 足 要 求 ， 需 要 高 精 度 的 测 量 设 备 对其进行测量。 目 前 ， 透 镜 中 心 厚 度 测 量 方 法 可 分 为 接 触 式 与 非 接 触 式 [6][7] 。 接 触 式 测 量 一 方 面 容 易 损 害 透 镜 ， 另 一 方…”

A coaxial assembling method of dual optical path system based on optical centering assembling

“…As the widely used optical structure, coaxial optical system has become the critical component of many elaborate compound machines [1][2][3]. However, with the development of science and technology, aerospace and lithography technology has put forward higher requirements on the imaging quality of ultra-precision coaxial optical system [4][5][6]. The machining and assembling process of optical system are the key issues in the determination of the imaging capability about coaxial optical system, in which the optical axis consistency condition is particularly important for precision coaxial optical system.…”