# US 4,391,915 A · Precision pressed optical components made of glass and glass suitable therefor

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- Number: US 4,391,915 A
- Document ID: US4391915A
- Status: Granted
- Kind: A
- Application number: 06/328,344
- Filed: 1981-12-07
- Granted: 1983-07-05
- Earliest claimed: 1981-10-22
- Assignees: U.S. Philips Corporation
- Inventors: Gertraud A. A. Meden-Piesslinger; Johannes H. P. Van de Heuvel
- Web page: https://patentgrep.com/patent/US4391915A

## CPC

- C03C 3/074: containing zinc
- C03C 3/062: with less than 40% silica by weight
- C03C 3/17: containing aluminium or beryllium
- C03C 3/19: containing boron
- Y10S 501/90: Optical glass, e.g. silent on refractive index and/or ABBE number
- 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
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Optical components can be pressed with such a precision that grinding and polishing of the formed components is not necessary, from glasses containing 45-55 wt. % P.sub.2 O.sub.5, 3.5-9 wt. % Al.sub.2 O.sub.3, 5-20 wt. % K.sub.2 O, 0-3 wt. % Li.sub.2 O, 8-15% BaO, 4.5-9 wt. % ZnO, 0-6 wt. % MgO, 0-18 wt. % PbO, 0-1 wt. % SiO.sub.2, 0-3 wt. % B.sub.2 O.sub.3, 0-2 wt. % TiO.sub.2.

## Claims

### Claim 1

Precision pressed optical components made of glass, which components are pressed from a glass containing phosphorus pentoxide (P.sub.2 O.sub.5), one or more alkali metal oxides and one or more alkaline earth oxides, characterized in that the glass consists of in a percentage by weight:
P.sub.2 O.sub.5 : 45-55
Al.sub.2 O.sub.3 : 3.5-9
K.sub.2 O: 5-20
Li.sub.2 O: 0-3
BaO: 8-15
ZnO: 4.5-9
MgO: 0-6
PbO: 0-18
SiO.sub.2 : 0-1
B.sub.2 O.sub.3 : 0-3
TiO.sub.2 : 0-2.

### Claim 2 (depends on 1)

Precision pressed glass optical components as claimed in claim 1, characterized in that the glass consists of in a percentage by weight:
P.sub.2 O.sub.5 : 51-53
Al.sub.2 O.sub.3 : 4.5-5.5
K.sub.2 O: 10.5-12
Li.sub.2 O: 1.5-2.5
BaO: 10-11.5
ZnO: 4.5-5.5
MgO: 1.5-2.5
PbO: 8-9.5
SiO.sub.2 : 0-1
B.sub.2 O.sub.3 : 2-3
TiO.sub.2 : 0-2.

### Claim 3

A glass containing phosphorus pentoxide, one or more alkali metal oxides and one or more alkaline earth oxides, characterized in that the glass consists of in a percentage by weight:
P.sub.2 O.sub.5 : 45-55
Al.sub.2 O.sub.3 : 3.5-9
K.sub.2 O: 5-20
Li.sub.2 O: 0-3
BaO: 8-15
ZnO: 4.5-9
MgO: 0-6
PbO: 0-18
SiO.sub.2 : 0-1
B.sub.2 O.sub.3 : 0-3
TiO.sub.2 : 0-2.

### Claim 4 (depends on 3)

A glass as claimed in claim 3, characterized in that the glass consists of in a percentage by weight:
P.sub.2 O.sub.5 : 51-53
Al.sub.2 O.sub.3 : 4.5-5.5
K.sub.2 O: 10.5-12
Li.sub.2 O: 1.5-2.5
BaO: 10-11.5
ZnO: 4.5-5.5
MgO: 1.5-2.5
PbO: 8-9.5
SiO.sub.2 : 0-1
B.sub.2 O.sub.3 : 2-3
TiO.sub.2 : 0-2.