US 8,193,108 B2Granted

Clad glass composition and mother glass rod for gradient-index rod lens formed using the same, gradient-index rod lens and method of manufacturing the same, rod lens array, and image processor

AssigneeNippon Sheet Glass Co., Ltd.

InventorsTeruhide Inoue, Kunihiro Nomiyama, Koichi Sakaguchi

Life of this patent

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Abstract

A clad glass composition that is excellent in devitrification resistance and that prevents the whole mother glass rod from devitrifying by preventing a core glass composition from devitrifying in forming a mother glass rod using a concentric crucible drawing method, is provided. The clad glass composition forms a clad of a mother glass rod for a gradient-index rod lens having a core/clad structure.

Claims6

Dependent claims

A mother glass rod for a gradient index rod lens having a core/clad structure,

wherein a clad glass composition that forms a clad is a clad glass composition that comprises the following components, indicated by mol %:
45 to 65% SiO2;
0.5 to 10% TiO2;
0 to 15% B2O3;
0 to 7% Al2O3;
0.1 to 10% Bi2O3;
0 to 5% Li2O;
5 to 30% Na2O;
0 to 10% K2O;
0 to 15% MgO;
0 to 10% CaO;
0 to 10% SrO;
0.5 to 10% BaO;
0 to 10% Cs2O;
0 to 10% ZnO;
0 to 7% Y2O3;
0 to 7% Nb2O5;
0 to 7% In2O3;
0 to 7% La2O3;
0 to 10% Ta2O5;
0 to 7% ZrO2;
and
0 to 1% Sb2O3,
where the total of Li2O+Na2O+K2O is in a range of 5 to 35 mol %,
the total of MgO+CaO+SrO+BaO is in a range of 2 to 20 mol %,
the total of Li2O+Na2O+K2O+MgO+CaO+SrO+BaO is in a range of 7 to 50 mol %, and
the total of Cs2O+ZnO+Y2O3+Nb2O5+In2O3+La2O3+ZrO2+Ta2O5 is in a range of 0 to 15 mol %,
at least two molar ratios selected from the group consisting of:
MgO/(MgO+CaO+SrO+BaO);
CaO/(MgO+CaO+SrO+BaO);
SrO/(MgO+CaO+SrO+BaO);
and
BaO/(MgO+CaO+SrO+BaO)
are at least 0.1, and
the clad glass composition is substantially free from lead and has a refractive index in a range of 1.56 to 1.68, and
a core glass composition that forms a core has a different composition from the clad glass composition, and comprises the following components, indicated by mol %:
40 to 65% SiO2;
1 to 10% TiO2;
0 to 20% B2O3;
0 to 10% Al2O3;
5 to 12% Li2O;
5 to 15% Na2O;
0 to 16% MgO;
0 to 15% CaO;
0.1 to 12% SrO;
0.1 to 12% SrO;
0.1 to 12% BaO;
0 to 3% Cs2O;
0 to 8% ZnO;
0 to 5% Y2O3;
0 to 5% Nb2O5.;
0 to 5% In2O3;
0 to 5% La2O3;
0 to 5% Ta2O5;
0 to 1% SnO2;
0 to 1% Sb2O3;
and
0 to 1% As2O3,
where the total of SiO2+TiO2+B2O3+Al2O3 is in a range of 50 to 70 mol %,
the total of Li2O+Na2O is in a range of 10 to 27 mol %,
the molar ratio of Li2O/Na2O is in a range of 0.7 to 2, and
the total of MgO+CaO+SrO+BaO is in a range of 5 to 36 mol %,
at least two values selected from the contents by percentage of CaO, SrO, and BaO are in a range of 0.1 to 15 mol %,
at least two molar ratios selected from the group consisting of:
MgO/(MgO+CaO+SrO+BaO);
CaO/(MgO+CaO+SrO+BaO);
SrO/(MgO+CaO+SrO+BaO);
and
BaO/(MgO+CaO+SrO+BaO)
are at least 0.1, and
the core glass composition is substantially free from lead.

68 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/553,454Filed 3 Sep 2009 · division
Priority: JP 2004-21541723 Jul 2004
Published: US 2009/0323196 A131 Dec 2009
Granted: 5 Jun 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

C03C 3/097
With 40% to 90% silica, by weight: containing phosphorus, niobium or tantalum
C03C 3/078
With 40% to 90% silica, by weight: containing an oxide of a divalent metal, e.g. an oxide of zinc
C03C 3/085
Containing aluminium oxide or an iron compound: containing an oxide of a divalent metal
C03C 3/089
With 40% to 90% silica, by weight: containing boron

Family

Application11/185,123Parent of this division · filed 20 Jul 2005
US 2009/0323196 A1Pre-grant publication · published 31 Dec 2009
US 2006/0019815 A1Published application
US 8,193,108 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

A mother glass rod for a gradient index rod lens having a core/clad structure,

wherein a clad glass composition that forms a clad is a clad glass composition that comprises the following components, indicated by mol %:
45 to 65% SiO2;
0.5 to 10% TiO2;
0 to 15% B2O3;
0 to 7% Al2O3;
0.1 to 10% Bi2O3;
0 to 5% Li2O;
5 to 30% Na2O;
0 to 10% K2O;
0 to 15% MgO;
0 to 10% CaO;
0 to 10% SrO;
0.5 to 10% BaO;
0 to 10% Cs2O;
0 to 10% ZnO;
0 to 7% Y2O3;
0 to 7% Nb2O5;
0 to 7% In2O3;
0 to 7% La2O3;
0 to 10% Ta2O5;
0 to 7% ZrO2;
and
0 to 1% Sb2O3,
where the total of Li2O+Na2O+K2O is in a range of 5 to 35 mol %,
the total of MgO+CaO+SrO+BaO is in a range of 2 to 20 mol %,
the total of Li2O+Na2O+K2O+MgO+CaO+SrO+BaO is in a range of 7 to 50 mol %, and
the total of Cs2O+ZnO+Y2O3+Nb2O5+In2O3+La2O3+ZrO2+Ta2O5 is in a range of 0 to 15 mol %,
at least two molar ratios selected from the group consisting of:
MgO/(MgO+CaO+SrO+BaO);
CaO/(MgO+CaO+SrO+BaO);
SrO/(MgO+CaO+SrO+BaO);
and
BaO/(MgO+CaO+SrO+BaO)
are at least 0.1, and
the clad glass composition is substantially free from lead and has a refractive index in a range of 1.56 to 1.68, and
a core glass composition that forms a core has a different composition from the clad glass composition, and comprises the following components, indicated by mol %:
40 to 65% SiO2;
1 to 10% TiO2;
0 to 20% B2O3;
0 to 10% Al2O3;
5 to 12% Li2O;
5 to 15% Na2O;
0 to 16% MgO;
0 to 15% CaO;
0.1 to 12% SrO;
0.1 to 12% SrO;
0.1 to 12% BaO;
0 to 3% Cs2O;
0 to 8% ZnO;
0 to 5% Y2O3;
0 to 5% Nb2O5.;
0 to 5% In2O3;
0 to 5% La2O3;
0 to 5% Ta2O5;
0 to 1% SnO2;
0 to 1% Sb2O3;
and
0 to 1% As2O3,
where the total of SiO2+TiO2+B2O3+Al2O3 is in a range of 50 to 70 mol %,
the total of Li2O+Na2O is in a range of 10 to 27 mol %,
the molar ratio of Li2O/Na2O is in a range of 0.7 to 2, and
the total of MgO+CaO+SrO+BaO is in a range of 5 to 36 mol %,
at least two values selected from the contents by percentage of CaO, SrO, and BaO are in a range of 0.1 to 15 mol %,
at least two molar ratios selected from the group consisting of:
MgO/(MgO+CaO+SrO+BaO);
CaO/(MgO+CaO+SrO+BaO);
SrO/(MgO+CaO+SrO+BaO);
and
BaO/(MgO+CaO+SrO+BaO)
are at least 0.1, and
the core glass composition is substantially free from lead.

68 more elements

Facts

Application

12/553,454Filed 3 Sep 2009 · division

Priority

JP 2004-21541723 Jul 2004

Published

US 2009/0323196 A131 Dec 2009

Granted

5 Jun 2012

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

C03C 3/097
With 40% to 90% silica, by weight: containing phosphorus, niobium or tantalum
C03C 3/078
With 40% to 90% silica, by weight: containing an oxide of a divalent metal, e.g. an oxide of zinc
C03C 3/085
Containing aluminium oxide or an iron compound: containing an oxide of a divalent metal
C03C 3/089
With 40% to 90% silica, by weight: containing boron