Optical glass

Patent metadata

Field	Value
Publication number	US-10294144-B2
Application number	US-201815979793-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	Nov 20, 2015
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

There is provided an optical glass having high infrared transmittance and being useful as an on-vehicle infrared sensor and the like. An optical glass including, in expression of atomic %: Ge+Ga; 6% to 30%; S+Se+Te; 50% to 85%; and Ti; 0.001% to 0.5%, wherein a wavelength (λ T10% ) at a long-wavelength side end in which infrared transmittance in a glass plate of the optical glass converted to a thickness of 1 mm becomes 10% is 12 μm or more.

First claim

What is claimed is:

1. An optical glass comprising, in expression of atomic %: Ge+Ga; 6% to 30%; S+Se+Te; 50% to 85%; and Ti; 0.001% to 0.5%,
wherein a wavelength (λ T10% ) at a long-wavelength side end which infrared transmittance through a glass plate converted to a thickness of 1 mm based on the optical glass becomes 10% is 12 μm or more.

2. The optical glass according to claim 1 , substantially not comprising As.

3. The optical glass according to claim 1 , comprising, in expression of atomic %:
Ge+Ga; 7% to 25%;
Sb; 0% to 35%;
Bi; 0% to 20%;
Zn; 0% to 20%;
Sn; 0% to 20%;
Si; 0% to 20%;
La; 0% to 20%;
S+Se+Te; 55% to 80%;
Ti; 0.005% to 0.3%;
Li+Na+K+Cs; 0% to 20%; and
F+Cl+Br+I; 0% to 20%, wherein
a glass transition point (Tg) of the optical glass is 140° C. to 550° C.

4. The optical glass according to claim 1 , comprising, in expression of atomic %:
Ge+Ga; 7% to 25%;
Sb; 0% to 35%;
Bi; 0% to 20%;
In; 0% to 20%;
Zn; 0% to 20%;
Sn; 0% to 20%;
Si; 0% to 20%;
La; 0% to 20%;
Y; 0% to 10%;
Gd; 0% to 10%;
Ca; 0% to 20%;
Sr; 0% to 20%;
Ba; 0% to 20%;
S+Se+Te; 55% to 80%;
Ti; 0.005% to 0.3%;
Li+Na+K+Cs; 0% to 20%; and
F+Cl+Br+I; 0% to 20%, wherein
a glass transition point (Tg) of the optical glass is 140° C. to 550° C.

5. The optical glass according to claim 1 , substantially not comprising Se.

6. The optical glass according to claim 1 , comprising, in expression of atomic %:
Ge+Ga; 8% to 23%;
Sb; 2% to 32%;
Bi; 0% to 10%;
In; 0% to 10%;
Zn; 0% to 15%;
Sn; 0% to 15%;
Si; 0% to 15%;
La; 0% to 15%;
Y; 0% to 8%;
Gd; 0% to 8%;
Ca; 0% to 15%;
Sr; 0% to 15%;
Ba; 0% to 15%;
S; 55% to 75%;
Te; 0% to 20%;
S+Te; 55% to 75%;
Ti; 0.01% to 0.2%;
Li+Na+K+Cs; 0% to 10%; and
F+Cl+Br+I; 0% to 10%, and comprising
C; 0.001% to 0.2%.

7. An optical device using the optical glass according to claim 1 .

8. An infrared sensor having the optical device according to claim 7 .

Assignees

• Agc Inc

Inventors

• Nagashima Tatsuo
• Miyazawa Hiroyasu
• Kitaoka Kenji

Classifications

• C03C3/323 Primary

  containing halogen, e.g. chalcohalide glasses · CPC title

• G02B1/00

  Optical elements characterised by the material of which they are made; Optical coatings for optical elements · CPC title

• C03C4/10

  for infrared transmitting glass · CPC title

• C03C3/321

  Chalcogenide glasses, e.g. containing S, Se, Te · CPC title

• C03C3/32

  Non-oxide glass compositions, e.g. binary or ternary halides, sulfides or nitrides of germanium, selenium or tellurium · CPC title