# US 10,246,368 B2 · Optical glass, optical element and optical device using optical glass

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- Number: US 10,246,368 B2
- Document ID: US10246368B2
- Status: Granted
- Kind: B2
- Application number: 15/954,069
- Filed: 2018-04-16
- Published: 2018-08-23
- Granted: 2019-04-02
- Earliest claimed: 2015-11-30
- Assignees: Nikon Corporation
- Applicants: Nikon Corporation
- Inventors: Tatsunori Kawashima; Hiroshi Yamamoto; Kohei Yoshimoto
- Web page: https://patentgrep.com/patent/US10246368B2

## CPC

- 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
- G02B 21/06: Means for illuminating specimens
- G02B 21/16: adapted for ultraviolet illumination {; Fluorescence microscopes (G02B21/0076 takes precedence)}
- G02B 27/0062: {by controlling the dispersion of a lens material, e.g. adapting the relative partial dispersion}
- G03B 17/14: interchangeably
- G03B 42/00: Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- 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
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

To provide an optical glass which has a unique combination of anomalous dispersibility in a visible range with that in a near-infrared range. Provided is an optical glass containing respective components of SiO2 from 14 to 26% by mass, B2O3 from 9 to 16% by mass, and La2O3 from 10 to 42% by mass as essential components, and containing respective components of ZnO, Y2O3, ZrO2, Ta2O5, Li2O, and Na2O as optional components, and satisfying respective relationships of SiO2+B2O3 from 28 to 36% by mass, ZrO2+Ta2O5 from 6 to 16% by mass, La2O3+Y2O3+ZnO from 43 to 59% by mass, and Li2O+Na2O from 2 to 14% by mass.

## Claims

### Claim 1

An optical glass containing respective components of
SiO2 from 14 to 26% by mass,
B2O3 from 9 to 16% by mass, and
La2O3 from 10 to 42% by mass
as essential components, and
containing respective components of ZnO, Y2O3, ZrO2, Ta2O5, Li2O, and Na2O as optional components, and
satisfying respective relationships of
SiO2+B2O3 from 28 to 36% by mass,
ZrO2+Ta2O5 from 6 to 16% by mass,
La2O3+Y2O3+ZnO from 43 to 59% by mass, and
Li2O+Na2O from 2 to 14% by mass.

### Claim 2 (depends on 1)

The optical glass according to claim 1, further containing respective components of
ZnO from 0% by mass to 45% by mass,
Y2O3 from 0% by mass to 20% by mass,
ZrO2 from 0% by mass to 7% by mass,
Ta2O5 from 0% by mass to 15% by mass,
Li2O from 0% by mass to 8% by mass,
Na2O from 0% by mass to 13% by mass, and
Sb2O3 from 0% by mass to 1% by mass.

### Claim 3 (depends on 2)

The optical glass according to claim 2, containing a component of
Y2O3 from 0% by mass to 5% by mass.

### Claim 4 (depends on 1)

The optical glass according to claim 1, wherein the optical glass has a refractive index (nd) from 1.68 to 1.75, and Abbe number (νd) from 43 to 50.

### Claim 5 (depends on 1)

The optical glass according to claim 1, wherein a value (ΔPc,t) indicating anomalous dispersibility in a near-infrared range is 0.0100 or less.

### Claim 6 (depends on 1)

The optical glass according to claim 1, wherein a value (ΔPg,F) indicating anomalous dispersibility in a short wavelength visible range is −0.0075 or less.

### Claim 7 (depends on 1)

The optical glass according to claim 1, wherein
a value (ΔPc,t) indicating anomalous dispersibility in a near-infrared range and a value (ΔPg,F) indicating anomalous dispersibility in a visible range
satisfy a relational expression represented by
ΔPc,t≤−5·(ΔPg,F+0.0075).

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 8)

An optical device comprising the optical element according to claim 8.