SU975617A1 - Optical glass - Google Patents

Description

C54) OPTICAL GLASS

The invention relates to compositions of optical glass intended for the manufacture of single and special bifocal spectacle lenses, as well as lenses and prisms of optical devices;

Known optical glass, including, wt.%:

SiOo40-61

BiO 512-36

AI OS3-6

NanO7-12

JTaO.1,5-4

CaO0,5-2

MgO0.1-0, "

BaO0,5-5, ZnO1

LU) Up to 2

Ti, DR 2

0.3-0.5

AinO

This glass has a refractive index of "1.5-1.53 11

The closest in technical essence and the achieved result to the invention is optical glass of the following composition, wt.%: SiO, 45-57; BOO, 2-8; Al-jO, 0-4; CaO 0-4; MgO 2-6; BaO 27-32; N

0-1.

Asjoj

0-2; K, O 2-6;

The refractive index of this glass is pc 1.61-1.63 {21.

To the disadvantages of these glasses, there is a high crystallization capacity and a high sintering temperature (630 ° C) with TC.

The purpose of the invention is to reduce the crystallization capacity of the crystal and the sintering temperature of the glass.

The goal is achieved by the fact that glass including SiOj, B, 0j, CaO, BaO, NajO, KjO, at least one about 15 of the group, additionally contains SrO, at least one oxide of the PHO, ZnO group, at least one oxide from the group T IQ, ZrOj, with the following ratio of components, wt.%:

SiO, 40-55

In O; 2-9

5-10

CaO 1-14,5

WAO

4-10

25

2.5-5

to „o

at least one oxide from the group

As-O ,, SbjOj0-3-1,

30SrO1-14

at least one oxide from the group

PYO, ZnO4-15

at least one oxide from the group

TiOj, ZrOj3-6

Optical glass with the aim of obtaining white color can contain at least one oxide from the group .FejC, MnjOj, CoO, NiOj In an amount of 0.01-0.03 wt.%.

The specific compositions of the glasses are given in Table 1, the properties of glasses are given in Table. 2

Glass was brewed in Kaarzev, platinum or fireclay crucibles at 1350-1450С.

It is possible to continuously cook glass in bathrooms with the development of blanks from liquid glass mass.

The glass has been tested with a positive result in the manufacture of bifaceous spectacle blanks. By offering

My glass has the required set of properties for the manufacture of bifocal glasses, low crystallization ability, high refractive index Pr 1.59-1.64,

sintering temperature, consistent with the sintering temperature of kronof glass, i.e. has a complex of necessary properties that provide bifocal spectacle lenses

required, dioptric sintering method.

The new glass makes it possible to manufacture sintered bifocal spectacle lenses of a new generation.

(WITH

a s h y

(" at

(N m

oh oh

oh oh

N 1

LTD

1L VO

9756178

table 2

Claims (1)

Claim Optical glass, including 5 I 0 ₂ , B <2 0 ₃ , C in 0, B 3 0, N a ₂ 0, K ₂ 0, at least one oxide from the group As ^ Oj, Sb ^ Oj, characterized in that, in order to reduce crystallization ability and sintering temperature, it additionally contains SrO, at least one oxide from the PbO group, ZnO, at least one oxide of the i-group T i, ZrO ₂ , in the following ratio of components, wt.%: 5 9 θ 3 ’ Sro 0.3-1.0 1-14 by at least one group oxide py PbO, ZnO 4-15 by at least one group oxide py T i 0 2, 2 g 0 _g 3-6 2. Glass by paragraph 1 I distinguish sh e e with me what, with the aim of semi- S 10 ₅ 40-55 B ₂ 0 ₃ 2-9. . CaO 5-10 Wow 1-14.5 4-10 2; 5-5 at least one oxide from the group 45 white ', it additionally contains at least one oxide from the group Fe ₂ 0 ₅ , Cu ₂ O, Μη ₂ 0 ₃ , CoO, NI0 _a 0.01-0.133. 50 Sources of information taken into account in the examination 1. USSR Copyright Certificate No. 185468, cl. S 03 S 3/08, 1965. 55 2. US patent No. 2551158, CL. 106-54, published. 1977 (prototype)