International Journal of Precision Engineering and Manufacturing

Korean Society for Precision Engineering (한국정밀공학회)
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A Study on the Mirror Grinding for Mold of a Small Aspherical Lens

  • Lee, Joo-Sang (School of Automotive and Mechanical Engineering, Nambu Univesity, Gwangju) ;
  • Masaru Saeki (Olympus Optical Co., Ltd., Tokyo) ;
  • Tsunemoto Kuriyagawa (Department of Mechatronics and Precision Enginering, Tohoky University, Sendai) ;
  • Katsuo Syoji (Department of Mechatronics and Precision Enginering, Tohoky University, Sendai)
  • Published : 2003.05.01
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Abstract

This paper deals with mirror grinding of a small-sized aspherical lens by a resin bonded diamond spherical wheel. Up to now, a spherical lens has been used for the lens of the optical communication optical part. However, recently, aspherical optical parts are mainly used in order to attempt the improvement in image quality and miniaturization of the optical device. It is possible to manufacture the aspherical lens which is presently being used in optical instrument through ultra-precision machining technology. Also, to realize compactness, efforts are being made to produce a micro aspherical lens, fur which the development of a high-precision, micro molding die is inevitable. Therefore, extensive research is being done on methods of producing a micro aspherical surface by high-precision grinding. In this paper, the spherical wheel was trued by cup-shaped truer and tool path was calculated by the radius of curvature of the wheel after truing and dressing. Then in the aspherical grinding experiment, WC material which is used as a melding die for the small-sized aspherical lens was ground. The results showed that a form accuracy of 0.1918 $\mu\textrm{m}$ P-V and a surface roughness of 0.064 $\mu\textrm{m}$ Rmax could be achieved.

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References

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