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Proceedings Paper

Novel automated process for aspheric surfaces
Author(s): Richard G. Bingham; David D. Walker; Do-Hyung Kim; David Brooks; Richard Freeman; Darren Riley
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Paper Abstract

We report on the development of a novel industrial process, embodied in a new robotic polishing machine, for automatically grinding an polishing aspheric optics. The machine is targeted at meeting the growing demand for inexpensive axially symmetric but aspherical lenses and mirrors for industry and science, non-axisymmetric and conformal optics of many kinds, the planarization of silicon wafers and associated devices, and for controlling form and texture in other artifacts including prosthetic joints. We describe both the physics and the implementation of the process. It is based on an innovative pressurized tool of variable effective size, spun to give high removal rate. The tool traverse and orientation are orchestrated in a unique (and patented) way to avoid completely the characteristic fast peripheral-velocity and center-zero left by conventional spinning tools. The pressurized tooling supports loose abrasive grinding and polishing, plus a new bound-abrasive grinding process, providing for a wide range of work from coarse profiling to fine polishing and figuring. Finally we discuss the critical control, data handling and software challenges in the implementation of the process, contrast the approach with alternative technologies, and present preliminary results of polishing trials.

Paper Details

Date Published: 24 October 2000
PDF: 6 pages
Proc. SPIE 4093, Current Developments in Lens Design and Optical Systems Engineering, (24 October 2000); doi: 10.1117/12.405237
Show Author Affiliations
Richard G. Bingham, Univ. College London (United Kingdom)
David D. Walker, Univ. College London and Zeeko Ltd. (United Kingdom)
Do-Hyung Kim, Univ. College London (United Kingdom)
David Brooks, Univ. College London (United Kingdom)
Richard Freeman, Zeeko Ltd. (United Kingdom)
Darren Riley, Zeeko Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 4093:
Current Developments in Lens Design and Optical Systems Engineering
Robert E. Fischer; Robert E. Fischer; R. Barry Johnson; Warren J. Smith; Warren J. Smith; William H. Swantner, Editor(s)

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