ISSN:
1013-9826
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:
Remarkable progress had been made in both technology and production of opticalelements including aspheric lens. Especially, requirements for machining glass materials have beenincreasing in terms of limitation on using environment, flexibility of material selection and surfaceaccuracy. In the past, precision optical glass lenses were produced through multiple processes suchas grinding and polishing, but mass production of aspheric lenses requiring high accuracy andhaving complex profile was rather difficult. Against such a background, the high-precision opticalGMP process was developed with an eye on mass production of precision optical glass pasts bymolding press. This GMP process can produce with precision and good repeatability special formlenses such as for cameras, video cameras, aspheric lenses for laser pickup, f-θ lens for laser printerand prism, and fine glass parts including diffraction grating and V-grooved base. Generally, GMPprocess can be classified into batch and progressive type. In these types, because progressive typehas many merits in that productivity is higher and repair/retouch of mold is easier than batch type,progressive GMP process is mainly used to produce aspheric glass lenses these days. In this paper,as a fundamental study to develop the multi-cavity mold for higher productivity of progressiveGMP process used in fabrication of aspheric glass lens, compression tests for K-PBK40, which isthe material of aspheric glass lens, were conducted at high temperature. As a result, flowcharacteristics of K-PBK40 were obtained for aspheric glass lens press simulation
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.476.pdf
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