IJAT Vol.8 No.1 pp. 34-42
doi: 10.20965/ijat.2014.p0034


Development of On-Machine Measurement Unit for Correction Processing of Aspheric Lens Mold with High Numerical Aperture

Tomohiro Hirose*,**, Yoshihiro Kami*, Tatsuhito Shimizu*,
Makoto Yabuya*, and Yoshitaka Morimoto**

*Nachi-Fujikoshi Corp., 1-1-1 Fujikoshi-Honmachi, Toyama 930-8511, Japan

**Kanazawa Institute of Technology, 7-1 Ohgigaoka Nonoichi, Ishikawa 921-8501, Japan

July 10, 2013
November 21, 2013
January 5, 2014
ultra-precision machine tool, lens mold, onmachine measurement unit, pick-up lens, high numerical aperture, correction processing

Most ultra-precision machine tools for fabricating optical lenses and lens molds have on-machine measurement units that can be used for form measurement with the workpiece held on the main spindle. However, for lenses with high numerical apertures, such as pick-up lenses for Blu-ray discs and their molds, the form measurement needs to be made even at a large angle of inclination, which is not feasible with a conventional on-machinemeasurement unit. In this study, an on-machine measurement unit with a measurement angle range±75 degrees is developed. Its performance assessment shows that it has high measurement reproducibility. Ultra-precision cutting are then made to verify the effectiveness of the on-machine measurement unit in the correction processing. It is also reported that, in grinding process, high-form-accuracy workpieces can be made through the correction processing by repeatedly using the on-machine measurement unit to make time-series measurements of the grinding wheel wear and by predicting the wear.

Cite this article as:
Tomohiro Hirose, Yoshihiro Kami, Tatsuhito Shimizu,
Makoto Yabuya, and Yoshitaka Morimoto, “Development of On-Machine Measurement Unit for Correction Processing of Aspheric Lens Mold with High Numerical Aperture,” Int. J. Automation Technol., Vol.8, No.1, pp. 34-42, 2014.
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Last updated on Jan. 15, 2021