ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
This paper presents the processing flow and results of optical fabrication for an opticalcorrecting lens with a free-form surface, namely a free-form lens. Because a correcting lens has norotation axes of symmetry and its surface cannot be expressed by a continuity equation, itsprocessing technology is different with that of general aspheric lenses. The correcting lens wasfirstly formed from a glass workblank with flat face using diamond abrasion wheel with sphericalshape, and then loose abrasive lapped and polished with oblique axis spherical tools to decrease thesurface roughness and increase the surface accuracy based on the measuring result after forming. Atthe lapping and polishing stages, two processing methods are employed. One is to control theprocessing pressure, and the other is based on dwell time. Since high precision fabrication is closelyrelated with high precision measuring, this paper also presents a high precision non-contact opticalmeasuring method based on image transforming for correcting lenses. The effectiveness of theprocessing flow and technology is confirmed by an experiment in which a workblank is processedinto a satisfying correcting lens
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.24-25.117.pdf
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