# US 2021/0276914 A1 · Optical glass, optical element, optical system, interchangeable lens, and optical device

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- Number: US 2021/0276914 A1
- Document ID: US20210276914A1
- Status: Published application
- Kind: A1
- Application number: 17/328,166
- Filed: 2021-05-24
- Published: 2021-09-09
- Earliest claimed: 2018-11-30
- Assignees: Hikari Glass Co., Ltd.
- Applicants: Hikari Glass Co., Ltd.
- Inventors: Noriaki IGUCHI; Miyuki ITO; Kazuma OHTAKA
- Web page: https://patentgrep.com/patent/US20210276914A1

## CPC

- C03C 3/21: containing titanium, zirconium, vanadium, tungsten or molybdenum
- C03C 3/064: containing boron
- C03C 3/066: containing zinc
- C03C 3/068: containing rare earths
- G02B 1/00: Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Provided is an optical glass including, by mass %, 24.5% to 41% of a P2O5 component, 6% to 17% of an Na2O component, 5% to 15% of a K2O component, over 0% to 7% or less of an Al2O3 component, 8% to 21% of a TiO2 component, and 5% to 38% of an Nb2O5 content, and the optical glass has a partial dispersion ratio (Pg, F) of 0.634 or less.

## Claims

### Claim 1

An optical glass comprising: by mass %,
24.5% to 41% of a P2O5 content;
6% to 17% of an Na2O content;
5% to 15% of a K2O content;
over 0% to 7% or less of an Al2O3 content;
8% to 21% of a TiO2 content; and
5% to 38% of an Nb2O5 content, wherein
the optical glass has a partial dispersion ratio (Pg, F) of 0.634 or less.

### Claim 2 (depends on 1)

The optical glass according to claim 1, further comprising: by mass %,
0% to 3.5% of an SiO2 content;
0% to 10% of a B2O3 content;
0% to 5% of a Bi2O3 content;
0% to 2% of an MgO content;
0% to 3.5% of an Li2O content;
0% to 9.5% of a CaO content;
0% to 9% of a BaO content;
0% to 1.5% of an SrO content;
0% to 5% of a ZnO content;
0% to 6% of a ZrO2 content;
0% to 1.5% of a Y2O3 content;
0% to 1.5% of an La2O3 content;
0% to 2% of a Gd2O3 content;
0% to 3% of a WO3 content; and
0% to 0.4% of an Sb2O3 content.

### Claim 3 (depends on 1)

The optical glass according to claim 1, wherein
total content rate of P2O5 and B2O3 (P2O5+B2O3) is from 28% to 43%.

### Claim 4 (depends on 1)

The optical glass according to claim 1, wherein
in a mass % basis, a ratio of the B2O3 content to the P2O5 content (B2O3/P2O5) is from 0 to 0.24.

### Claim 5 (depends on 1)

The optical glass according to claim 1, wherein
in a mass % basis, a ratio of the TiO2 content to the P2O5 content (TiO2/P2O5) is from 0.3 to 0.7.

### Claim 6 (depends on 1)

The optical glass according to claim 1, wherein
in a mass % basis, a ratio of the Nb2O5 content to the P2O5 content (Nb2O5/P2O5) is from 0.1 to 1.3.

### Claim 7 (depends on 1)

The optical glass according to claim 1, wherein
by mass %, a sum of contents including Li2O, Na2O, and K2O (Li2O+Na2O+K2O) is from 14% to 25% or less.

### Claim 8 (depends on 1)

The optical glass according to claim 1, wherein
a refractive index (nd) with respect to a d-line is within a range from 1.66 to 1.81, and
an abbe number (νd) is within a range from 22 to 32.

### Claim 9 (depends on 1)

The optical glass according to claim 1, wherein
specific gravity (Sg) is from 2.8 to 3.4.

### Claim 10 (depends on 1)

The optical glass according to claim 1, wherein
ΔPg, F is from 0.0190 to 0.0320.

### Claim 11 (depends on 1)

The optical glass according to claim 1, wherein
when 50 g of raw materials of the optical glass are heated at a temperature from 1,100 degrees Celsius to 1,250 degrees Celsius, a time period required for melting the raw materials is less than 15 minutes.

### Claim 12 (depends on 1)

An optical element using the optical glass according to claim 1.

### Claim 13 (depends on 12)

An optical system comprising the optical element according to claim 12.

### Claim 14 (depends on 13)

An interchangeable lens comprising the optical system according to claim 13.

### Claim 15 (depends on 13)

An optical device comprising the optical system according to claim 13.