Process for producing rod glass having refractive index distribu

Details Process for producing rod glass having refractive index distribu Process for producing rod glass having refractive index distribu

1992-12-16

1993-11-16

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 181, 65 184, 65 64, 65102, C03B 37075

Patent

active

052619389

ABSTRACT:
A process for producing a rod glass having a refractive index distribution, which includes pressing a glass at a temperature below the glass transition temperature to form a glass having a density increased towards the surface layer thereof, or alternatively includes heating a glass at a temperature around the transition temperature at the lowest to prepare glass having a uniformly enhanced density and heating the treated glass under a pressure lower than the applied pressure at a temperature below the glass transition temperature of the glass to prepare a glass having a density increased towards the central portion.

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patent: 4778505 (1988-10-01), Hirota
Shand, Glass Engineering Handbook, 1959, pp. 106-109.
Hampton, Some Problems Relating to Optical Glasses, Sep. 1, 1942, vol. 54, part 5 The Proceedings of the Physical Society pp. 392-404.
J. Arndt et al, "Anomalous changes in some properties of silica glass densified at very high pressures", Physics and Chemistry of Glasses, vol. 10, pp. 117-124 (Jun. 1969).
H. Hummel et al., "Anomalous Optical Relaxation Behaviour of Densified SiO.sub.2 Glass", J. Non-Crystalline Solids, 109, pp. 40-46 (1989).
J. D. MacKenzie, "High-Pressure Effects on Oxide Glasses: I, Densification in Rigid State"; J. Amer. Ceramic Soc., 46, pp. 470-476 (Oct. 21,).
J. D. MacKenzie, "High-Pressure Effects on Oxide Glasses: II, Subsequent Heat Treatment", J. Amer. Ceramic Soc., 46 pp. 461-470 (Oct. 1963).

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