SU753802A1 - Light beam control device - Google Patents

Description

The invention relates to glass compositions that regulate the matching of the light color fluxes and can be used to improve the spectral characteristics of light filters. Adjusting the ratio of blue and red light fluxes is necessary in order for the filter to have a color contrast coordinated with a spectrum of heated objects or melts having a color temperature of 1400–1900 ° K. This filter has an undoubted advantage from the point of view of visual radiation. The currently used absorption glass protection filters do not provide in many cases the optimal ratio of red and blue light fluxes necessary to create a color contrast consistent with the spectrum of the heated body. A known glass is known, from which it is possible to make a filter that regulates blue and edge light fluxes, including, in wt.%: 60-75 SiOj CaO 6-16 MgO 0-10 11 - 20 NajO CgO 0-10 0.001 - 0.02 CoO RvaOz 0.2 - 1 0.0005 - 0.02, Se 11 - 21 1. This MZO-K20 Odaako said composition does not provide for the transmission of visible light in the visible part of the spectrum necessary for a protective filter, and the required ratio of red and blue light fluxes, at least 0.8 The closest to the invention in the acceptable result is the composition, wt.%: SiOj60-78 A jOj0.3-18 CaO6-18 MgO0.9 NajO7 - 18 KjO0-5 LijO0-3

RjOCNaiO-KjO-LijO)

7 About About About

- 24 WAO

 with

Prius

- 0.5 TiOj 0.029 Se 0.00035

O - 0.05

Sulphides 0.001-0.25 2

Soo

However, this composition also does not provide the necessary ratio of red and blue light fluxes, greater than 0.8, with a total transmittance less than 3%.

The aim of the invention is to increase the ratio of red light to blue to a value greater than 0.8.

This goal is achieved by the fact that AgjO is additionally introduced into glass, including SiOj, CaO, MgO, NajO, KjO, APjOsi CoO, FejOa, with the following ratio of the indicated components, wt.%:

SiOj60

70 6 3

CaO3

MDO1.5

NajO12

15.5

KaO0.5 1.5 3 1

A ZOZ1,5

CoO 0.6

Resoz0,7

1,3

AdO1,5 14,

however, no more than 20% of AgjO can be in the form of reduced ;; silver. In addition, glass may contain an additional 0.10, 2% NiO to correct the spectral curve.

The presence in the glass composition of AgjO in the specified amount allows one to regulate the ratio of red and blue light fluxes in fairly wide limits from 0.8 to 7.

The reduced silver causes a sharp decrease in the transmission in the blue part of the spectrum with a maximum at 420 nm. In this connection, smooth adjustment of the ratio of blue and red light fluxes is difficult, both when the concentration of silver oxide is changed ™ and with the change in the thickness of the film obtained from glass. Thus restored

NO SOXIDE OXIDE should be as low as possible and not exceed 20% of the total content of silver oxide.

The ko6anbTa oxide is introduced mainly by absorbing green and yellow rays and adjusting the red and blue light fluxes, but to a small extent, since this ratio is usually not more than 0.7-0.8.

The presence of iron oxide in the glass composition in a specified amount creates absorption in the ultraviolet and infrared regions, sufficient to protect against these radiations, and also affects the ratio of red and blue light fluxes.

The light-regulating glass film can be obtained by ion-exchange treatment of a glass ribbon, the composition of which contains sodium and potassium oxides in an amount larger by an amount equivalent to the content of silver oxide in the specified composition.

The tape can be obtained by dividing the glass vertically down through a metal boat. Thickness is from 30 to 1000 microns

By processing this ribbon of glass in a melt of sodium nitrate and silver nitrate at a temperature of 340-380 ° C, as a result of the exchange of a part of Na and K ions for Hell, a glass film of this composition is obtained, which has light-regulating properties.

Such a light control layer can be gluchit directly on the glass filter.

The applied method for producing a glass film ensures that silver is present in the form of oxide in specified amounts, even in compositions containing up to 1% PbHO3.

When silver is introduced by burning (cementation) in an amount of more than 1.5% into glass containing 1% of Fe203, the glass becomes opalescent, i.e. it becomes opaque and thus unsuitable for the above purposes.

The specific compositions of the light control film and their effect on the ratio of red and blue light fluxes can be seen from the following table.

575

These films can be applied to improve the color contrast of some protective filters in the form of an additional filter or in the form of a film formed on the surface of an existing filter as a result of ion-exchange treatment.

The effect of the application of these films is double:

-improving the color contrast of the filter

based on the proposed glass film

it would be more accurate to distinguish the object, which will lead to a significant improvement in working conditions and more accurate management of technological processes (for example, open-hearth smelting of steel);

- the ability to obtain on one glass composition a sufficiently wide range of filters for controlling the thickness of the film or changing the concentration of silver to observe heated objects with a color temperature of 1400-1900.

Claims (2)

1. Glass for controlling light fluxes, including RLH, CaO, MDO, NajO, K2O, AtjOa, CoO, FejOj, characterized in that, in order to increase the ratio of red light to blue to a value greater than 0.8, it additionally contains AgjO in the following ratio of these components, wt.% SiOj60 - 70 CaO3-6 MDO1.5 - 3 NajO12 - 15.5 KjO0.5 - 1.5 AtjOj1,5 - 3,0 Soo0,6-1 FejOa0.7 - 1.3 AgjO1,5 - 14 2. The glass according to claim 1, characterized in that, in order to correct the spectral curve, it further comprises NiO in an amount of 0.1-0.2%. Sources of information taken into account in the examination 1. US patent N 3296604, cl. 340-174, 1967. 2. The patent of Great Britain N 1168769, cl. With 1 M, pub. 1966.