The challenges and focuses on plastic welding by picosecond laser in the field of camera module assembly

IF 4.6 2区物理与天体物理 Q1 OPTICS Optics and Laser Technology Pub Date : 2024-09-10 DOI:10.1016/j.optlastec.2024.111751

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Abstract

Polycarbonate (PC) and cyclic olefin copolymers (COC) are extensively employed in optical lenses due to their exceptional optical properties. However, mechanical clamping forces connecting lenses to each other and barrel within the camera module assembly (CMA) can lead to image quality degradation. Laser welding of plastics has emerged as an innovative technique for addressing this issue. Picosecond laser welding has successfully achieved joints between PC to PC, PC to COC, and COC to COC under optical contact (OC) and non-optical contact (NOC) conditions. Comprehensive analyses of weld zone morphology and mechanical properties have revealed diffusion bonding as the mechanism for joint formation and brittle fracture as the mechanism for fracture. By contrasting the requirements of camera module assembly with these plastic joints, the joint bonding strength is deemed adequate. However, numerous challenges and limitations hinder the advancement of laser plastic welding within the CMA field. Pertinent suggestions have been provided to address these obstacles, including the optimization of welding parameters, utilization of a high-NA focal system, and surface polishing of materials. The implementation of improved laser welding techniques is expected to significantly contribute to the future development of CMA.

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用皮秒激光进行塑料焊接在照相机模块组装领域的挑战和重点

聚碳酸酯（PC）和环烯烃共聚物（COC）因其优异的光学性能而被广泛应用于光学镜头中。然而，在相机模组组件（CMA）中，镜片与镜筒之间的机械夹紧力会导致图像质量下降。塑料激光焊接已成为解决这一问题的创新技术。在光学接触（OC）和非光学接触（NOC）条件下，皮秒激光焊接成功实现了 PC 与 PC、PC 与 COC 以及 COC 与 COC 之间的焊接。对焊接区形态和机械性能的综合分析表明，扩散接合是接头形成的机理，而脆性断裂则是接头断裂的机理。通过将摄像头模块组装的要求与这些塑料接头进行对比，我们认为接头的结合强度是足够的。然而，众多挑战和限制阻碍了激光塑料焊接在 CMA 领域的发展。针对这些障碍提出了相关建议，包括优化焊接参数、使用高 NA 聚焦系统和材料表面抛光。改良激光焊接技术的实施有望极大地促进 CMA 的未来发展。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems