Computer Controlled Optical Surfacing With Orbital Tool Motion

Robert A. Jones

doi:10.1117/12.948856

28 October 1985 Computer Controlled Optical Surfacing With Orbital Tool Motion

Robert A. Jones

Proceedings Volume 0550, Sensor Design Using Computer Tools II; (1985) https://doi.org/10.1117/12.948856
Event: 1985 Technical Symposium East, 1985, Arlington, United States

Abstract

Asymmetric aspheric optical surfaces are very difficult to fabricate using classical techniques and laps the same size as the workpiece. Opticians can produce such surfaces by grinding and polishing, using small laps with orbital tool motion. However, hand correction is a time consuming process unsuitable for large optical elements. Itek has developed Computer Controlled Optical Surfacing (CCOS) for fabricating such aspheric optics. Automated equipment moves a nonrotating orbiting tool slowly over the workpiece surface. The process corrects low frequency surface errors by figuring. The velocity of the tool assembly over the workpiece surface is purposely varied. Since the amount of material removal is proportional to the polishing or grinding time, accurate control over material removal is achieved. The removal of middle and high frequency surface errors is accomplished by pad smoothing. For a soft pad material, the pad will compress to fit the workpiece surface producing greater pressure and more removal at the surface high areas. A harder pad will ride on only the high regions resulting in removal only for those locations.

Citation Download Citation

Robert A. Jones "Computer Controlled Optical Surfacing With Orbital Tool Motion", Proc. SPIE 0550, Sensor Design Using Computer Tools II, (28 October 1985); https://doi.org/10.1117/12.948856

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KEYWORDS

Surface finishing

Polishing

Diamond

Computer simulations

Aspheric lenses

Mirrors

Sensors

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