CA1051041A - Glass for cathode-ray tubes for displaying television pictures - Google Patents
Glass for cathode-ray tubes for displaying television picturesInfo
- Publication number
- CA1051041A CA1051041A CA249,705A CA249705A CA1051041A CA 1051041 A CA1051041 A CA 1051041A CA 249705 A CA249705 A CA 249705A CA 1051041 A CA1051041 A CA 1051041A
- Authority
- CA
- Canada
- Prior art keywords
- glass
- cathode
- ray tubes
- displaying television
- television pictures
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/078—Glass compositions containing silica with 40% to 90% silica, by weight containing an oxide of a divalent metal, e.g. an oxide of zinc
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
- C03C3/105—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/863—Vessels or containers characterised by the material thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
ABSTRACT:
Glass for cathode-ray tubes for television display having a considerably cheaper mixture. The mix-ture is free of lithium compounds and contains less potassium. The glass is characterized by having a com-position between the limits in weight %:
Glass for cathode-ray tubes for television display having a considerably cheaper mixture. The mix-ture is free of lithium compounds and contains less potassium. The glass is characterized by having a com-position between the limits in weight %:
Description
-p~
; LO~P~ 3 29 . J . 19 ~ o 1~)5 "Glass for cathode-ray tubes for displaying tele~ision pictures".
:: -: - .
The ~n~ention relates to glass for cathode-r~y tubes for displaying television pictures, particularly : :
black-and-white p.ictures~ and for the faceplate of che ~-tube as well as for its coneO
Tbis glass must s~atisfy certain requirements as rega~ds the number of physical prop,rtles which are - associated with the shaping and sealing technique o~ the tube parts- The tube parts, i. 2 the faceplate and the cone .
are p~oduced by pressing and~or spinning, whilst the par~s 10 . are sealed to~ether under the application of heat by means of a flame with electrical~auxiliary heating th~ou&h : the glass which has been rendèred properly~canducli~e b~
means of heating. When gas~es are removed by firing ~he ~ ~`
~:i tube on the exhaust line at elevated temperature, the 15 ~ tube must not be deformed.
: ~
: The~above results in the fact that the ~isco-sity cur~e of the glass is rather accurately establi~h- :. .;
~d. The softening point, i.~.:the tempeIature a~t ~-hich .:~`
~ tha ~iscosity Or the glass amounts to 107' poi~ses must be approximately 670 ~ 15C and~`the so-called "~-arm len~th~
i.e. the difference Oetween~the workin tempera~ure at : wh~ch the ~iscosity of the glass is 10 poises and lihe ~ :
29 .3 . 7G
~05~
softening point mui~t be approximately 350 + 15C.
Another important magnitude is the electrical resistivity at an el~ated temperature. As a measure for this a temperature has been chosen at which the resis~
tivity is equal to 100~0hm.cm = 10 Ohm. cm:TK 10 Usually this temperature ha3 a value of 290 + 10C.
A glass ,which has been customary so~ar for bulbs for black-and-white television display is the fol-lowing (in weight%)~
SiO2 6~.7 BaO13.6 ;
Na20 8-5 . Al232.5 K 0 6.6 Sb230.6.
Li20 ' O . 5 ' . .; `
In the last few years the prices of a number of raw materials have risen drastically. Among the moSt expensiYe raw materials for composing the mtxture for ~.
: the abo~e glass are lepidolite,~petalite or spodumene :~
which furnish the Li2Q and the~ potassium which is tlle . raw material for the K20. It was an object of this in~
vention to provide a glass which requires a cheaper mix-ture~ but which would not impair~the properties of the bulb for a black-and-white television display tube~and the display:~tube itself and which would not impede pro- : `
du c t i on of the glass.
: ~ : , , ~ - ~ , :
It has now appeared that no disadvantages are experienced if for the T~ = 100 a ~alue was chosen:which i~ 400C lower than the value which`has been usual sofar, ;~:
.
;, ~ , .
, PH~ 7987 -' ~ 29.3.76 .
:
~(15~
:
i.e. at least 2400C instead of at least 280C.
. If the Li20 is omitted from the ~bo~e glass ~nd ;
by ~hifting the ratio Na20/K20 in favour of the Na20, ~:
a glass was obtained ~lich has a TX = 100 which is up to 4QoC lower but whose above viscous properti.es ha~e remained substantially unchanged; `~
The glass composition according to the inven~lon ~: .
is ~Eee of Li20 and is characterized in that it is situat~
ed between the following limits in weight %:
SiO2 ` .62-69 `~ `
.
Na20 ~ K20 1~-17 1.4< Na20/K20 ~ 2.2 : ....... BaO ~-14 ~:
SrO . 0-2 - :
PbO 0 A123 ;~
` - Sb23 ~ As23 0-0.8 : F 0-~-5 ~ Zr2 ~ 2 20 By way of example some compositions in weigh~
~ are given below which are within the scope of the in-`~ ~ention and which are obtain~ed by melting a correspond~
; ing mixture, together with thé Tx 100~ the softening point Tso~ (~ = 107-6 poises)~, the working tempera~ure TW~r (~ = 104 poises) and the ratio YazO/KzO. :~
.
.
.: , ~
- . - ` ~ ~
' PH~ 7g~7 3 29.3.76 :J 05~
5~2 67.6 67.9 7.3 6~ 6 .8 I Na20 9.0 9,4 9.8 9-3 9.2 :l K20 6.ll 5-9 5:6 500 5-9 ., , Li20 ~ _ _ _ _ l BaO 13.7 13.2 13.7 l3.3 13.7 i, ~ Zr2 O 0.2 ~ ~ _ _ SrO Q.2 0.2 0.2 0.2 0.2 pbO _ _ _ 3-7 _~
23 2.5 2.6 2.7 3.4 3.~
i ~ o.6 o.6 0.7 0.7 0.7 ~ t% of total) _ _ ~ _ 0.35 , ~ ~ ~ '` ~' ~ .:-- -1 ~ K - lQO(~ C) ~Z65 255 255 260 260 T90f (C) 6681 677 677 671 681 wor ( C) 1020 1027 1027 1Q28 1028 ~-zO/~O 1.l~0 1.6 1.7S 1.86 1.S9 ~ ." ' . ' .
:
, . ' ' ~ :
.:
: . :
: ' : ' : , :
~ -S1~34~
Till now screen glasses for colour TY-display were subject to requirements different from those for screen glasses for black-and-white display. The colour glass had to be "harder" than the black-and-white glasses, i.e. the temperatures at which the glass possesses a definite value of ~he viscosity, as the strain point (~ = 1014 6 poises), the annealing temperature ~ = 10 poises) and the softening point (~=107-65 poises) should be about 20-30 C
higher for the former glasses than for the latter ones. The reason for selec-ting harder glasses for colour display is related to the fact, that upon manufacture of a cathode ray tube for ~elevision display such high temperatures are needed for sealing of the screen to the cone and for evacuating the tube, that there is a risk of deformation,upon use of softer glasses.
In the last few years, ho~ever, the sealing temperatures and the evacuation temperatures could be lowered considerably.
Thus it is possible to use the Li20-free glass of the invention for colour TV-display.
An important advantage of this kind of glasses as compared with glasses for colour TV, which were till now in use, is that upon polishing less glass has to be removed; e.g. 0.08 mm of glass instead of 0;35 mm. The reason for it is, that the glass is softer and that the shear-mark is much less deep.
- 5a -
; LO~P~ 3 29 . J . 19 ~ o 1~)5 "Glass for cathode-ray tubes for displaying tele~ision pictures".
:: -: - .
The ~n~ention relates to glass for cathode-r~y tubes for displaying television pictures, particularly : :
black-and-white p.ictures~ and for the faceplate of che ~-tube as well as for its coneO
Tbis glass must s~atisfy certain requirements as rega~ds the number of physical prop,rtles which are - associated with the shaping and sealing technique o~ the tube parts- The tube parts, i. 2 the faceplate and the cone .
are p~oduced by pressing and~or spinning, whilst the par~s 10 . are sealed to~ether under the application of heat by means of a flame with electrical~auxiliary heating th~ou&h : the glass which has been rendèred properly~canducli~e b~
means of heating. When gas~es are removed by firing ~he ~ ~`
~:i tube on the exhaust line at elevated temperature, the 15 ~ tube must not be deformed.
: ~
: The~above results in the fact that the ~isco-sity cur~e of the glass is rather accurately establi~h- :. .;
~d. The softening point, i.~.:the tempeIature a~t ~-hich .:~`
~ tha ~iscosity Or the glass amounts to 107' poi~ses must be approximately 670 ~ 15C and~`the so-called "~-arm len~th~
i.e. the difference Oetween~the workin tempera~ure at : wh~ch the ~iscosity of the glass is 10 poises and lihe ~ :
29 .3 . 7G
~05~
softening point mui~t be approximately 350 + 15C.
Another important magnitude is the electrical resistivity at an el~ated temperature. As a measure for this a temperature has been chosen at which the resis~
tivity is equal to 100~0hm.cm = 10 Ohm. cm:TK 10 Usually this temperature ha3 a value of 290 + 10C.
A glass ,which has been customary so~ar for bulbs for black-and-white television display is the fol-lowing (in weight%)~
SiO2 6~.7 BaO13.6 ;
Na20 8-5 . Al232.5 K 0 6.6 Sb230.6.
Li20 ' O . 5 ' . .; `
In the last few years the prices of a number of raw materials have risen drastically. Among the moSt expensiYe raw materials for composing the mtxture for ~.
: the abo~e glass are lepidolite,~petalite or spodumene :~
which furnish the Li2Q and the~ potassium which is tlle . raw material for the K20. It was an object of this in~
vention to provide a glass which requires a cheaper mix-ture~ but which would not impair~the properties of the bulb for a black-and-white television display tube~and the display:~tube itself and which would not impede pro- : `
du c t i on of the glass.
: ~ : , , ~ - ~ , :
It has now appeared that no disadvantages are experienced if for the T~ = 100 a ~alue was chosen:which i~ 400C lower than the value which`has been usual sofar, ;~:
.
;, ~ , .
, PH~ 7987 -' ~ 29.3.76 .
:
~(15~
:
i.e. at least 2400C instead of at least 280C.
. If the Li20 is omitted from the ~bo~e glass ~nd ;
by ~hifting the ratio Na20/K20 in favour of the Na20, ~:
a glass was obtained ~lich has a TX = 100 which is up to 4QoC lower but whose above viscous properti.es ha~e remained substantially unchanged; `~
The glass composition according to the inven~lon ~: .
is ~Eee of Li20 and is characterized in that it is situat~
ed between the following limits in weight %:
SiO2 ` .62-69 `~ `
.
Na20 ~ K20 1~-17 1.4< Na20/K20 ~ 2.2 : ....... BaO ~-14 ~:
SrO . 0-2 - :
PbO 0 A123 ;~
` - Sb23 ~ As23 0-0.8 : F 0-~-5 ~ Zr2 ~ 2 20 By way of example some compositions in weigh~
~ are given below which are within the scope of the in-`~ ~ention and which are obtain~ed by melting a correspond~
; ing mixture, together with thé Tx 100~ the softening point Tso~ (~ = 107-6 poises)~, the working tempera~ure TW~r (~ = 104 poises) and the ratio YazO/KzO. :~
.
.
.: , ~
- . - ` ~ ~
' PH~ 7g~7 3 29.3.76 :J 05~
5~2 67.6 67.9 7.3 6~ 6 .8 I Na20 9.0 9,4 9.8 9-3 9.2 :l K20 6.ll 5-9 5:6 500 5-9 ., , Li20 ~ _ _ _ _ l BaO 13.7 13.2 13.7 l3.3 13.7 i, ~ Zr2 O 0.2 ~ ~ _ _ SrO Q.2 0.2 0.2 0.2 0.2 pbO _ _ _ 3-7 _~
23 2.5 2.6 2.7 3.4 3.~
i ~ o.6 o.6 0.7 0.7 0.7 ~ t% of total) _ _ ~ _ 0.35 , ~ ~ ~ '` ~' ~ .:-- -1 ~ K - lQO(~ C) ~Z65 255 255 260 260 T90f (C) 6681 677 677 671 681 wor ( C) 1020 1027 1027 1Q28 1028 ~-zO/~O 1.l~0 1.6 1.7S 1.86 1.S9 ~ ." ' . ' .
:
, . ' ' ~ :
.:
: . :
: ' : ' : , :
~ -S1~34~
Till now screen glasses for colour TY-display were subject to requirements different from those for screen glasses for black-and-white display. The colour glass had to be "harder" than the black-and-white glasses, i.e. the temperatures at which the glass possesses a definite value of ~he viscosity, as the strain point (~ = 1014 6 poises), the annealing temperature ~ = 10 poises) and the softening point (~=107-65 poises) should be about 20-30 C
higher for the former glasses than for the latter ones. The reason for selec-ting harder glasses for colour display is related to the fact, that upon manufacture of a cathode ray tube for ~elevision display such high temperatures are needed for sealing of the screen to the cone and for evacuating the tube, that there is a risk of deformation,upon use of softer glasses.
In the last few years, ho~ever, the sealing temperatures and the evacuation temperatures could be lowered considerably.
Thus it is possible to use the Li20-free glass of the invention for colour TV-display.
An important advantage of this kind of glasses as compared with glasses for colour TV, which were till now in use, is that upon polishing less glass has to be removed; e.g. 0.08 mm of glass instead of 0;35 mm. The reason for it is, that the glass is softer and that the shear-mark is much less deep.
- 5a -
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS
1. A glass for cathode-ray tubes for displaying television pictures, black-and-white pictures in par-ticular, characterized in that it is free of Li2O and that it has a composition between the following limits in weight %.
2. An electron-beam tube of which at least a part consists of glass as claimed in Claim 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7504202A NL7504202A (en) | 1975-04-09 | 1975-04-09 | GLASS FOR CATHOD BEAM TUBES FOR DISPLAY OF TELEVISION IMAGES. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1051041A true CA1051041A (en) | 1979-03-20 |
Family
ID=19823533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA249,705A Expired CA1051041A (en) | 1975-04-09 | 1976-04-06 | Glass for cathode-ray tubes for displaying television pictures |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS51123209A (en) |
| AT (1) | AT345905B (en) |
| AU (1) | AU498819B2 (en) |
| BE (1) | BE840488A (en) |
| BR (1) | BR7602162A (en) |
| CA (1) | CA1051041A (en) |
| DE (1) | DE2613124C2 (en) |
| ES (1) | ES446781A1 (en) |
| FR (1) | FR2306948A1 (en) |
| GB (1) | GB1518875A (en) |
| IT (1) | IT1058778B (en) |
| NL (1) | NL7504202A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7705731A (en) * | 1977-05-25 | 1978-11-28 | Philips Nv | CATHOD BEAM TUBE. |
| FR2560870B1 (en) * | 1984-03-09 | 1991-06-21 | Corning Glass Works | LOW LEAD OXIDE GLASSES USEFUL FOR THE PRODUCTION OF ELECTRICAL COMPONENTS |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6907309A (en) * | 1969-05-13 | 1970-11-17 | ||
| BE757012A (en) * | 1969-10-03 | 1971-04-02 | Philips Nv | GLASS FOR CATHODIC RAY TUBES USED FOR THE REPRODUCTION OF TELEVISION IMAGES |
| DE2142491B2 (en) * | 1971-08-25 | 1975-05-28 | Fried. Krupp Gmbh, 4300 Essen | Cooling tower |
| NL7203860A (en) * | 1972-03-23 | 1973-09-25 |
-
1975
- 1975-04-09 NL NL7504202A patent/NL7504202A/en not_active Application Discontinuation
-
1976
- 1976-03-27 DE DE19762613124 patent/DE2613124C2/en not_active Expired
- 1976-04-06 IT IT6779776A patent/IT1058778B/en active
- 1976-04-06 AT AT246376A patent/AT345905B/en not_active IP Right Cessation
- 1976-04-06 GB GB1386476A patent/GB1518875A/en not_active Expired
- 1976-04-06 CA CA249,705A patent/CA1051041A/en not_active Expired
- 1976-04-07 ES ES446781A patent/ES446781A1/en not_active Expired
- 1976-04-07 BE BE165934A patent/BE840488A/en unknown
- 1976-04-07 JP JP3833076A patent/JPS51123209A/en active Granted
- 1976-04-08 BR BR7602162A patent/BR7602162A/en unknown
- 1976-04-09 AU AU12849/76A patent/AU498819B2/en not_active Expired
- 1976-04-09 FR FR7610462A patent/FR2306948A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| NL7504202A (en) | 1976-10-12 |
| FR2306948A1 (en) | 1976-11-05 |
| JPS51123209A (en) | 1976-10-27 |
| ATA246376A (en) | 1978-02-15 |
| ES446781A1 (en) | 1977-10-01 |
| DE2613124C2 (en) | 1983-01-27 |
| BE840488A (en) | 1976-10-07 |
| BR7602162A (en) | 1976-10-05 |
| GB1518875A (en) | 1978-07-26 |
| AT345905B (en) | 1978-10-10 |
| IT1058778B (en) | 1982-05-10 |
| AU498819B2 (en) | 1979-03-29 |
| DE2613124A1 (en) | 1976-10-14 |
| JPS5435213B2 (en) | 1979-11-01 |
| AU1284976A (en) | 1977-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4012263A (en) | Alkali-free glasses | |
| US3653933A (en) | Anomalous dispersion optical glass having a good weather proof characteristic | |
| US4238705A (en) | Incandescent lamp seal means | |
| US3794502A (en) | Glass for cathode-ray tubes for television display | |
| US2901366A (en) | Glass composition | |
| CA1051041A (en) | Glass for cathode-ray tubes for displaying television pictures | |
| US3454408A (en) | Solder glass compositions and method of sealing metal therewith | |
| EP0360965B1 (en) | Glass for projection cathode ray tube faceplate | |
| US2429432A (en) | Glass composition | |
| US4174490A (en) | Cathode-ray tube | |
| US3420683A (en) | Low melting glass | |
| US2564950A (en) | Glass-to-metal seal and composition thereof | |
| US2937100A (en) | Glass compositions and glass-to-metal seals | |
| KR101484634B1 (en) | Led color conversion materials with excellent color conversion efficiency and light extraction efficiency and method of manufacturing the same | |
| US2018817A (en) | Soft glass composition of high electrical resistance | |
| US3663246A (en) | Glass for television display cathode-ray tubes | |
| US2388866A (en) | Lead glass composition | |
| US2025099A (en) | X-ray absorption glass | |
| US3627549A (en) | Barium silicate glass for television display cathode-ray tubes | |
| CA1043095A (en) | Glass for television display cathode-ray tubes | |
| US2199856A (en) | Refractory glass | |
| FR2385652A1 (en) | LOW TEMPERATURE DEVITRIFIABLE SEALING COMPOSITION | |
| US3100714A (en) | Optical crown glasses | |
| US2469867A (en) | Glasses having a low coefficient of expansion | |
| US2562292A (en) | Glass composition |