CA1043095A - Glass for television display cathode-ray tubes - Google Patents
Glass for television display cathode-ray tubesInfo
- Publication number
- CA1043095A CA1043095A CA219,736A CA219736A CA1043095A CA 1043095 A CA1043095 A CA 1043095A CA 219736 A CA219736 A CA 219736A CA 1043095 A CA1043095 A CA 1043095A
- Authority
- CA
- Canada
- Prior art keywords
- glass
- ray tubes
- television display
- oxide
- display cathode
- 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
- C03C3/105—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing aluminium
-
- 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
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
-
- 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
-
- 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
Abstract
ABSTRACT
Glass for face-plates of TV display tubes, having a composition in % by weight limited as follows:
Glass for face-plates of TV display tubes, having a composition in % by weight limited as follows:
Description
I'IIN 73.J~
~ O/Yi~rl3/~;L~L~I
17--12-1971~
~(943~
~Glass for te1e~is:ioll di5pla~ catllo~o~ray tubes".
_____.
The in~ention re1~tes to glass ~or a catllode-ray tube env~1opo ~Ol' displa~rin~ colour te1evision ~:ictures, p~r-tiou1ar1y glass ~or the ;race-p1a~e of tho tuba~
Such a series of specia1 glasses i5 knowll I`rom the 5 UK Patent Specification 1,290,608, ~ ose.composition in ~ by weight lies Wit}lill tlle ran~e 1imited as ~o110~rs, ~ tll tlle associatcd additional conditions:
SiO2 5l~69 Na20 6 10) t Na O ~ K O combi~ed 14-2 .10. K 0 5-1oJ 2 2 - CaO 0-4 MgO 0-2.5 A123 o_6 1 zro2 o-6~ r2 ~ A12o3 ~ 6 ~ ~aO 8~ BaO ~ 2ZrO2 ~ ZnO ~ IISb203 > 20 ZnO 0~5 J zro2 ~ ZnO ~ Sb203 ~ 3 ~2 -5~93 Sb203 o_3 .
~203 ` As203 + Sb203 ~ -3 The~e series o~ g1asses was found to sat1s~y the ~or~
- . .
stringent requirements relati~o to X-ray transmission~ This stringent requirement states that the intensity o~ tlle trans-mitted X-ray radiation must be not more -tl-a~ 0.5 mi1lirontge~
per hou~ (mr/h)~ mea~llred at 5 om~ ~rom tlle screen at an acceleration voltage o~ 35 kV and an anode current Or 3 x 100 : -2 ' ~ . ' .
:E'IIN 73~
17~ 7 l1 ~6~43~95 in a television display tubc.
Starting from a minimum thicl~ness of 11 n~n of tho screcn gla~.s~ the above-ment-io}l-~d r~n~e of glass~s amply c;at:is-fies this requirement; a nwllber of gla35es locatcd witl-Lin t]liS
ran~e o~ compositions remains ~ithin ~he impos~ r-~quircm~nt, even at an acceleratlon volta~e of l~o ~
Thesc glasses were a satisfactol~y comproltl~sc rela~ e to the othcr roquire~ nts to be imposed on glas~es :for tllis use ~ to wit:
a) the temperature difference be~-~eell the so~teni.n~ point, i.e the temperaturo at which the vi.scosity of the glass is 107 ~
poises, and the alLnealing point, i . e~ the temperatule at W31iCn the viscosity of the glass is 10 34 poises9 must be at lca~t 1 ~)0C .
b) the annelaîng point must bo not less than 4850C~
c~ the thermal coe~ficient of expallsion must De ap~ro~il~teL-y-100 x 10 7/oc in the range of 30-300C~
d~ the glasses must not show any.trace o~ devitrification phenomena~ ~
~e) when re-usingr rejected screons on which the ~luor0scent coatin~r is.~removod and which are cleaned by meuns of a .~hydrofluoric acid-containing solution, thore may be no trace o~ selocti~e attack~ and f) the ~alue of T ~ ~i.e. the temp0raturc at which e = 10 5 . Ohm~cm) must be not less than 3600C.
The tendency of still further increaslng the safety margin rolati~e to X~ray radiation emitted by television displcLy tubes has continuod.
Accordin~r to this more strin~ent requirement a dis~lay tube operated at an acceleration volt-a~re o~ ~0 kV and an anO~
: ~3 ~ .
l"rN 7~5 17-12~1~7 30g5 curront of 3 x 100 /uA ~nc~ mit not more tl~an 0.5 Ill~/h of X-ray radiat:ion, me;lsured~lt a distance of 5 cnl from the screen.
Tllis more stringent requirelllent can easily bc satis-~ied by il~creasing th.e sllare o~ o~ es o~ hcavy ~let~ in glass of the above-mentioned type, bl.lt the probl~l i.. s that at tlle sas,~e time the other propertie.s stated l-ereinbcfore must not ~eviate.
The invention provides a range o~ ~la9se~ wi-th which this com~lex Or proporties is realised and sollle o~ th~m yield an X-ray radiation within the abo~re~mentio~d In~rgln at an acceleration voltage o~ up to 45 kV. Su*pris:ingl~ , the ZrO2 content relati~e to the above~ entione~ knowll glasses could ev0n ~urther be increased ~ithout devit-i~ication phcnonlana occurrin~O Generally~ ZrO2 considerably irlcreases tll~ crystalli-sation tendency of glassos; ZrO2 is ~requentl~r used as a . nuclai-forming agent in the-manu~acture Or ~lass ceramics.
- The~lasses according t~ the inven tion are character-ized in that-~ their composition lios within the ~ollol-ring ~ange limited in ~ by lre:ight: i .
; . . . SiV2 58 66 .
~ Na20 7_~o K~O 6-11 cnmbined 1~-20 L- 0 0-2 . . -CaO 0-4 MgO -0-2.5
~ O/Yi~rl3/~;L~L~I
17--12-1971~
~(943~
~Glass for te1e~is:ioll di5pla~ catllo~o~ray tubes".
_____.
The in~ention re1~tes to glass ~or a catllode-ray tube env~1opo ~Ol' displa~rin~ colour te1evision ~:ictures, p~r-tiou1ar1y glass ~or the ;race-p1a~e of tho tuba~
Such a series of specia1 glasses i5 knowll I`rom the 5 UK Patent Specification 1,290,608, ~ ose.composition in ~ by weight lies Wit}lill tlle ran~e 1imited as ~o110~rs, ~ tll tlle associatcd additional conditions:
SiO2 5l~69 Na20 6 10) t Na O ~ K O combi~ed 14-2 .10. K 0 5-1oJ 2 2 - CaO 0-4 MgO 0-2.5 A123 o_6 1 zro2 o-6~ r2 ~ A12o3 ~ 6 ~ ~aO 8~ BaO ~ 2ZrO2 ~ ZnO ~ IISb203 > 20 ZnO 0~5 J zro2 ~ ZnO ~ Sb203 ~ 3 ~2 -5~93 Sb203 o_3 .
~203 ` As203 + Sb203 ~ -3 The~e series o~ g1asses was found to sat1s~y the ~or~
- . .
stringent requirements relati~o to X-ray transmission~ This stringent requirement states that the intensity o~ tlle trans-mitted X-ray radiation must be not more -tl-a~ 0.5 mi1lirontge~
per hou~ (mr/h)~ mea~llred at 5 om~ ~rom tlle screen at an acceleration voltage o~ 35 kV and an anode current Or 3 x 100 : -2 ' ~ . ' .
:E'IIN 73~
17~ 7 l1 ~6~43~95 in a television display tubc.
Starting from a minimum thicl~ness of 11 n~n of tho screcn gla~.s~ the above-ment-io}l-~d r~n~e of glass~s amply c;at:is-fies this requirement; a nwllber of gla35es locatcd witl-Lin t]liS
ran~e o~ compositions remains ~ithin ~he impos~ r-~quircm~nt, even at an acceleratlon volta~e of l~o ~
Thesc glasses were a satisfactol~y comproltl~sc rela~ e to the othcr roquire~ nts to be imposed on glas~es :for tllis use ~ to wit:
a) the temperature difference be~-~eell the so~teni.n~ point, i.e the temperaturo at which the vi.scosity of the glass is 107 ~
poises, and the alLnealing point, i . e~ the temperatule at W31iCn the viscosity of the glass is 10 34 poises9 must be at lca~t 1 ~)0C .
b) the annelaîng point must bo not less than 4850C~
c~ the thermal coe~ficient of expallsion must De ap~ro~il~teL-y-100 x 10 7/oc in the range of 30-300C~
d~ the glasses must not show any.trace o~ devitrification phenomena~ ~
~e) when re-usingr rejected screons on which the ~luor0scent coatin~r is.~removod and which are cleaned by meuns of a .~hydrofluoric acid-containing solution, thore may be no trace o~ selocti~e attack~ and f) the ~alue of T ~ ~i.e. the temp0raturc at which e = 10 5 . Ohm~cm) must be not less than 3600C.
The tendency of still further increaslng the safety margin rolati~e to X~ray radiation emitted by television displcLy tubes has continuod.
Accordin~r to this more strin~ent requirement a dis~lay tube operated at an acceleration volt-a~re o~ ~0 kV and an anO~
: ~3 ~ .
l"rN 7~5 17-12~1~7 30g5 curront of 3 x 100 /uA ~nc~ mit not more tl~an 0.5 Ill~/h of X-ray radiat:ion, me;lsured~lt a distance of 5 cnl from the screen.
Tllis more stringent requirelllent can easily bc satis-~ied by il~creasing th.e sllare o~ o~ es o~ hcavy ~let~ in glass of the above-mentioned type, bl.lt the probl~l i.. s that at tlle sas,~e time the other propertie.s stated l-ereinbcfore must not ~eviate.
The invention provides a range o~ ~la9se~ wi-th which this com~lex Or proporties is realised and sollle o~ th~m yield an X-ray radiation within the abo~re~mentio~d In~rgln at an acceleration voltage o~ up to 45 kV. Su*pris:ingl~ , the ZrO2 content relati~e to the above~ entione~ knowll glasses could ev0n ~urther be increased ~ithout devit-i~ication phcnonlana occurrin~O Generally~ ZrO2 considerably irlcreases tll~ crystalli-sation tendency of glassos; ZrO2 is ~requentl~r used as a . nuclai-forming agent in the-manu~acture Or ~lass ceramics.
- The~lasses according t~ the inven tion are character-ized in that-~ their composition lios within the ~ollol-ring ~ange limited in ~ by lre:ight: i .
; . . . SiV2 58 66 .
~ Na20 7_~o K~O 6-11 cnmbined 1~-20 L- 0 0-2 . . -CaO 0-4 MgO -0-2.5
2 3 0-2 Zr2 6-10 l BaO 4-18 ~ BaO ~ 2ZrO2 ~ 3.1PbO ~ 28 - P~o o_l~
:
~ .
I'lIN 7~5 1 7- 1 2~ '7 4 ~ 9 ~
~2 ~5 - ~3 Sb23 ~ ~523 -3 ~ -7 ~ 0.2--2 Tho glasses ~ithi~ t~le follo~Yin~ limi.ts in ~ by w~ig~t are proforred, because their omitted X-ra~ radiatio~ ramai.~s within the above-mentio.ncd mar~in, e~on at an acc~leratio~
~olta~e of up to 2~5 k~r SiO2 . 5~-66 Na 0 7-10 K20 6-10 combincd 14-20 L~20 0-2 - CaO 0-4 MgO ow~,5 .15 ~123 0-D.5 Z~2 ~ 7~9 ) ~aO 8-18 ~ BaO ~ 2ZrO2 ~ 3.1PbO ~ 28 PbO 0-2'J
- CeO2 -5-~-3 . Sb23 + AS23 -3'~7 - F 0.2-2 Sevcral glasses according to the in~ention will now .be mentioned b~ way o~ example with their important physical val~e~. They ara obtainod in the conventional~glass--technological manner by melting a mi~ture o~ sand~ potassium carbollate~ sodium car~onate, dolomite) cerium oxide, barium carbonate, zirconium silicate~ antimony oxide and sodium silicofluoride, and if ~vccssary, ~olspar, magnesium oxi~e, calcium carbonate, peta~ite, ' , `
- - -- T ~
lll~ 7~$
~, 17~l2 19'74 \
_ .
minium, sodi~n nitrato and arsellous trioxid~.
The relQvant mi~tures a~e intro~ucecl into a platinum crucibl~ in a ~as-fir~d furn.~o~ at 1400C wi~h ~.n air excess Or 1:2.5~ ~ft~r n~lti~g l~ tcmperature in th~ furnac~ i.3 mai.n-tainod at 1/150C for 2~ hour.s, cooled to 1200C alld t~len 1;lle ~lass~s are pour~d ou~.
~aea//~g . l'h~ U'~ ,, poi.nt and the soft~ning p~in-t ar~-denoted b~r ~he ~bbreviations an.p. and sr~p, r2spec~i~elyO
." . Thc coef~ici~nt Or e~pansion o~ -t~le gl~ss~s lies betw2en 98 and 102 x lG 7/oc, measured ~et~ n 30 and 300C.
C omp o ~s ~ t i OIl ~, _ 1 1 2 1 3 . 4 ~r SiO2 61 .6 60.6 6002 60006 Na2~ 8~8 .9-3 8~5 8~7 K20 8.1 8~ 1 .8-1 10~6 BaO 13.6 13.6 16.3 10.7 Zr2 6.o ;7.5 6.o 9.o .
PbO 1.0 : - . .
23 0.1 0.1 0.1 0.14 2 3 o.6 oO6 0~6 o~6 CeO~ I 0.2 0.2 0.2 0,2 to ~hich is . : . .
added in ~ ~ 0 . 8 : 1. 5 0 ~ 8 0 ~ 8 .
__~ ~ , , . _ an.p 490 490 4~8 497 ~-P I 680 ~88 691 713 T ¦ 366 360 377 3~0 :
- ' .
'' -~ . ' ' . ' .
~ 6_ .
:
~ .
I'lIN 7~5 1 7- 1 2~ '7 4 ~ 9 ~
~2 ~5 - ~3 Sb23 ~ ~523 -3 ~ -7 ~ 0.2--2 Tho glasses ~ithi~ t~le follo~Yin~ limi.ts in ~ by w~ig~t are proforred, because their omitted X-ra~ radiatio~ ramai.~s within the above-mentio.ncd mar~in, e~on at an acc~leratio~
~olta~e of up to 2~5 k~r SiO2 . 5~-66 Na 0 7-10 K20 6-10 combincd 14-20 L~20 0-2 - CaO 0-4 MgO ow~,5 .15 ~123 0-D.5 Z~2 ~ 7~9 ) ~aO 8-18 ~ BaO ~ 2ZrO2 ~ 3.1PbO ~ 28 PbO 0-2'J
- CeO2 -5-~-3 . Sb23 + AS23 -3'~7 - F 0.2-2 Sevcral glasses according to the in~ention will now .be mentioned b~ way o~ example with their important physical val~e~. They ara obtainod in the conventional~glass--technological manner by melting a mi~ture o~ sand~ potassium carbollate~ sodium car~onate, dolomite) cerium oxide, barium carbonate, zirconium silicate~ antimony oxide and sodium silicofluoride, and if ~vccssary, ~olspar, magnesium oxi~e, calcium carbonate, peta~ite, ' , `
- - -- T ~
lll~ 7~$
~, 17~l2 19'74 \
_ .
minium, sodi~n nitrato and arsellous trioxid~.
The relQvant mi~tures a~e intro~ucecl into a platinum crucibl~ in a ~as-fir~d furn.~o~ at 1400C wi~h ~.n air excess Or 1:2.5~ ~ft~r n~lti~g l~ tcmperature in th~ furnac~ i.3 mai.n-tainod at 1/150C for 2~ hour.s, cooled to 1200C alld t~len 1;lle ~lass~s are pour~d ou~.
~aea//~g . l'h~ U'~ ,, poi.nt and the soft~ning p~in-t ar~-denoted b~r ~he ~bbreviations an.p. and sr~p, r2spec~i~elyO
." . Thc coef~ici~nt Or e~pansion o~ -t~le gl~ss~s lies betw2en 98 and 102 x lG 7/oc, measured ~et~ n 30 and 300C.
C omp o ~s ~ t i OIl ~, _ 1 1 2 1 3 . 4 ~r SiO2 61 .6 60.6 6002 60006 Na2~ 8~8 .9-3 8~5 8~7 K20 8.1 8~ 1 .8-1 10~6 BaO 13.6 13.6 16.3 10.7 Zr2 6.o ;7.5 6.o 9.o .
PbO 1.0 : - . .
23 0.1 0.1 0.1 0.14 2 3 o.6 oO6 0~6 o~6 CeO~ I 0.2 0.2 0.2 0,2 to ~hich is . : . .
added in ~ ~ 0 . 8 : 1. 5 0 ~ 8 0 ~ 8 .
__~ ~ , , . _ an.p 490 490 4~8 497 ~-P I 680 ~88 691 713 T ¦ 366 360 377 3~0 :
- ' .
'' -~ . ' ' . ' .
~ 6_ .
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Glass for envelopes of television display cathode-ray tubes, particularly intended for the face-plate of the tube, comprising SiO2, alkali oxide, barium oxide, zirconium oxide, cerium oxide and arsenous and/or antimony oxide, characterized in that tho composition in % by weight lies within the range limited as follows:
2. Glass as claimed in Claim 1, characterized in that it has a composition within the following limits in % by weight
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7401936A NL7401936A (en) | 1974-02-13 | 1974-02-13 | GLASS FOR CATHODE RAY TUBES FOR TELEVISION AVE. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1043095A true CA1043095A (en) | 1978-11-28 |
Family
ID=19820736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA219,736A Expired CA1043095A (en) | 1974-02-13 | 1975-02-10 | Glass for television display cathode-ray tubes |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS50114417A (en) |
| AR (1) | AR204124A1 (en) |
| BE (1) | BE825461A (en) |
| BR (1) | BR7500799A (en) |
| CA (1) | CA1043095A (en) |
| DE (1) | DE2504153A1 (en) |
| DK (1) | DK48075A (en) |
| ES (1) | ES434624A1 (en) |
| FR (1) | FR2260543A1 (en) |
| GB (1) | GB1472390A (en) |
| IT (1) | IT1031590B (en) |
| NL (1) | NL7401936A (en) |
| SE (1) | SE393975B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7613412A (en) * | 1976-12-02 | 1978-06-06 | Philips Nv | ELECTRIC DISCHARGE TUBE. |
| US4336480A (en) * | 1979-03-24 | 1982-06-22 | Mitsubishi Denki Kabushiki Kaisha | Cathode ray tube |
| NL7909332A (en) * | 1979-12-28 | 1981-07-16 | Philips Nv | LAMP FITTED WITH A GLASS LAMP VESSEL AND GLASS SUITABLE FOR IT. |
| JPS575251A (en) * | 1980-06-12 | 1982-01-12 | Nippon Electric Glass Co Ltd | Cathode ray tube glass |
| US4804885A (en) * | 1982-02-04 | 1989-02-14 | Tektronix, Inc. | X-ray attenuating ceramic materials |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4832113A (en) * | 1971-08-30 | 1973-04-27 | ||
| NL7203860A (en) * | 1972-03-23 | 1973-09-25 | ||
| JPS5433189B2 (en) * | 1972-09-08 | 1979-10-18 |
-
1974
- 1974-02-13 NL NL7401936A patent/NL7401936A/en unknown
-
1975
- 1975-01-01 AR AR257593A patent/AR204124A1/en active
- 1975-02-01 DE DE19752504153 patent/DE2504153A1/en not_active Withdrawn
- 1975-02-07 BR BR799/75A patent/BR7500799A/en unknown
- 1975-02-10 DK DK48075*#A patent/DK48075A/da unknown
- 1975-02-10 SE SE7501450A patent/SE393975B/en unknown
- 1975-02-10 GB GB548875A patent/GB1472390A/en not_active Expired
- 1975-02-10 CA CA219,736A patent/CA1043095A/en not_active Expired
- 1975-02-10 JP JP50016352A patent/JPS50114417A/ja active Pending
- 1975-02-10 IT IT20099/75A patent/IT1031590B/en active
- 1975-02-11 ES ES434624A patent/ES434624A1/en not_active Expired
- 1975-02-12 BE BE153300A patent/BE825461A/en unknown
- 1975-02-13 FR FR7504506A patent/FR2260543A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| AR204124A1 (en) | 1975-11-20 |
| SE393975B (en) | 1977-05-31 |
| GB1472390A (en) | 1977-05-04 |
| SE7501450L (en) | 1975-08-14 |
| IT1031590B (en) | 1979-05-10 |
| DK48075A (en) | 1975-10-06 |
| BE825461A (en) | 1975-08-12 |
| JPS50114417A (en) | 1975-09-08 |
| FR2260543A1 (en) | 1975-09-05 |
| BR7500799A (en) | 1975-11-25 |
| DE2504153A1 (en) | 1975-08-14 |
| ES434624A1 (en) | 1977-01-16 |
| AU7802975A (en) | 1976-08-12 |
| NL7401936A (en) | 1975-08-15 |
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