Nippon Sheet Glass Company, Limited

Yoshikazu Kaite

Yoshirou Ikeda

Shigeo Kittaka

Minoru Toyama

Takashi Yamagishi

Hiroshi Koshi

Noboru Akazawa

Toshiro Ikuma

This invention relates to a method of performing an ion exchange of optical glass to produce an axial gradient index material having a good linear distributiion by bringing a glass body containing a monovalent cation component into contact with a medium containing a monovalent cation component and exchanging these cation components under a predetermined condition.

Method of performing an ion exchange of optical glass

The essential surface of the glass body to undergo the ion exchange processing is coated with the porous layer, which is formed by drying and sintering inorganic fluid, containing clay for more than 3 weight %, so as to have the ion exchange carried out through the above porous layer.

Ion exchange processing method of glass

This invention provides a light-transmitting glass having superior weatherability which has the following composition in % by weight:

Optical glass fiber having cover glass of sodium zinc alumino

A step-type light-transmitting body having excellent water resistance, said light-transmitting body comprising a core material of a glass having the following composition in % by weight: (1) SiO.sub.2 15-40, (2) ZrO.sub.2 8-17, (3) B.sub.2 O.sub.3 5-15, (4) BaO 30-45, (5) Na.sub.2 O 3-15, as essential ingredients, and (6) GeO.sub.2 0-30, TiO.sub.2 0-3, Al.sub.2 O.sub.3 0-5, La.sub.2 O.sub.3 0-5, MgO 0-5, CaO 0-7, ZnO 0-7, SrO 0-5, Li.sub.2 O 0-8, K.sub.2 O 0-10, Rb.sub.2 O 0-5, and Cs.sub.2 O 0-8, as additional ingredients; provided that SiO.sub.2 +GeO.sub.2 15-50, ZrO.sub.2 +BaO 38-55, Na.sub.2 O+Li.sub.2 O+K.sub.2 O+Rb.sub.2 O+Cs.sub.2 O 5-15, and MgO+CaO+ZnO+SrO+TiO.sub.2 +Al.sub.2 O.sub.3 +La.sub.2 O.sub.3 0-12. In the above composition, the amounts of (2) ZrO.sub.2, (3) B.sub.2 O.sub.3, (5) Na.sub.2 O and ZrO.sub.2 + BaO may be changed to 8-15, 7-12, 5-12, and 38-50, respectively.

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Hyogo, Japan

Yoshikazu Kaite