Hocheol Lee/Junguk Kim/Hyunhyung Kang
The Journal of Mechanical Science and Technology, vol. 24, no. 1, pp.153-158, 2010

Abstract : This paper presents a novel airbag tool polishing technique for small aspherical glass lens molds. For a mold material such as tungstencarbide, an ultra-precise grinding technique is used to generate the aspherical surface. However, the residual tool marks of the spiral pattern and scratch unavoidably develop on the mold surface. Therefore, post-polishing is required to obtain the optical surface. Footprinting by the superposition method without trajectory control was applied to polish the finely ground aspherical lens mold. A white light interferometer confirmed the tool mark removal effect. The final surface roughness was Ra 2nm. Microscopic observation also showed a cleaner surface without scratches.

Keyword : Airbag tool; Aspherical lens; Footprint; Polishing; Tool mark