IP Library › Granted Patent US 7,524,781
Granted Patent B2
US 7,524,781 · App. 11/311,559 · Granted Apr 28, 2009

Non-lead optical glass and optical fiber

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Quick Facts
Patent No.
US 7,524,781
App. No.
11/311,559
Granted
Apr 28, 2009
Kind
B2
Abstract

A non-lead optical glass consisting essentially of, as represented by mol %, from 45 to 75% of Bi 2 O 3 , from 12 to 45% of B 2 O 3 , from 1 to 20% of Ga 2 O 3 , from 1 to 20% of In 2 O 3 , from 0 to 20% of ZnO, from 0 to 15% of BaO, from 0 to 15% of SiO 2 +Al 2 O 3 +GeO 2 , from 0 to 15% of MgO+CaO+SrO, from 0 to 10% of SnO 2 +TeO 2 +TiO 2 +ZrO 2 +Ta 2 O 3 +Y 2 O 3 +WO 3 and from 0 to 5% of CeO 2 , wherein Ga 2 O 3 +In 2 O 3 +ZnO≧5%. An optical fiber comprising the above non-lead optical glass as a core.

Claims (5)

1. A non-lead optical glass having a refractive index of at least 2.10 at a wavelength of 1,550 nm, consisting essentially of, as represented by mol % based on the following oxides, from 45 to 75% of Bi 2 O 3 , from 12 to 45% of B 2 O 3 , from 1 to 20% of Ga 2 O 3 , from 1 to 20% of In 2 O 3 , from 0 to 20% of ZnO, from 0 to 15% of BaO, from 0 to 2.99% of SiO 2 +Al 2 O 3 +GeO 2 , from 0 to 15% of MgO+CaO+SrO, from 0 to 10% of SnO 2 +TeO 2 +TiO 2 +ZrO 2 +Ta 2 O 3 +Y 2 O 3 +WO 3 and from 0 to 5% of CeO 2 , wherein Ga 2 O 3 +In 2 O 3 +ZnO is at least 5%.

2. The non-lead optical glass according to claim 1 , wherein Bi 2 O 3 is from 45 to 55%, BaO is from 0 to 10%, MgO+CaO+SrO is from 0 to 10%, and CeO 2 is from 0.1 to 3%.

3. The non-lead optical glass according to claim 1 , wherein Bi 2 O 3 is more than 55% and not more than 75%, B 2 O 3 is from 12 to 20%, Ga 2 O 3 is from 3 to 18%, In 2 O 3 is from 2 to 13%, ZnO is from 0 to 13%, BaO is from 0 to 3%, SiO 2 +Al 2 O 3 +GeO 2 is from 0 to 2.99%, MgO+CaO+SrO is from 0 to 10%, SnO 2 +TeO 2 +TiO 2 +ZrO 2 +Ta 2 O 3 +Y 2 O 3 +WO 3 is from 0 to 5%, and CeO 2 is from 0.1 to 1%.

4. The non-lead optical glass according to claim 1 , wherein Bi 2 O 3 is more than 55% and not more than 75%, B 2 O 3 is more than 20% and not more than 45%, In 2 O 3 is from 2 to 13%, ZnO is from 0 to 18%, BaO is from 0 to 6%, SiO 2 +Al 2 O 3 +GeO 2 is from 0 to 1.0%, MgO+CaO+SrO is from 0 to 10%, SnO 2 +TeO 2 +TiO 2 +ZrO 2 +Ta 2 O 3 +Y 2 O 3 +WO 3 is from 0 to 5%, and CeO 2 is from 0.1 to 3%.

5. An optical fiber having a core and a cladding, wherein the core is made of the non-lead optical glass as defined in claim 1 .

Assignments (2)
CHANGE OF NAME Recorded Aug 7, 2018
From: ASAHI GLASS COMPANY, LIMITED
To: AGC INC.
Reel/Frame 046730/0786 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 20, 2005
From: NAGASHIMA, TATSUO; SUGIMOTO, NAOKI; OHARA, SEIKI; HASEGAWA, TOMOHARU
To: ASAHI GLASS COMPANY, LIMITED
Reel/Frame 017395/0855 →