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

사출압축성형을 적용한 고해상도 폰 카메라용 플라스틱 렌즈 개발

  • Received : 2012.07.19
  • Accepted : 2012.08.27
  • Published : 2013.01.01

Abstract

This study aims to develop a plastic aspheric lens for a 13-megapixel mobile phone camera by injection-compression 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.

Keywords

Lens;Weldline;Phase Difference;Birefringence;Injection Molding;Injection-Compression Molding;Mold

Acknowledgement

Supported by : 한국교통대학교, 한국연구재단

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