US3195716A - Mixed getter devices, with evaporated and not evaporated gettering material, for maintaining the vacuum in electronic tubes - Google Patents

Mixed getter devices, with evaporated and not evaporated gettering material, for maintaining the vacuum in electronic tubes Download PDF

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US3195716A
US3195716A US102754A US10275461A US3195716A US 3195716 A US3195716 A US 3195716A US 102754 A US102754 A US 102754A US 10275461 A US10275461 A US 10275461A US 3195716 A US3195716 A US 3195716A
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evaporable
gettering material
evaporated
groove
maintaining
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Porta Paolo Della
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
    • H01J7/186—Getter supports

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  • FIG. 2 DELLA PORTA MIXED GETTER DEVICES, WITH EVAPORATED AND NOT EVAPORA'I'ED GETTERING MATERIAL, FOR MAINTAINING THE VACUUM IN ELECTRONIC TUBES Filed April 13. 1961 FIG. 2
  • This invention relates to an improvement in getter devices for maintaining the vacuum in electronic tubes, and more particularly, in getter devices of the mixed type having a closed form, such as circular, ring or disc like, containing a portion of evaporable, and a portion of nonevaporable gettering material. Examples of this type of mixed getter device are described and illustrated in FlG- URES 9 and 10 of Italian patent application No. 9,283 of December 29, 1960.
  • One of the problems of the utilisation of non-evaporable gettering material is the necessity of activating it at high temperatures.
  • the invention of the aforesaid application No. 9,283 relates to the problem of maintaining the non-evaporable getter at the necessary operating temperature after the activation.
  • This invention relates, on the contrary, to the problem of activating the non-evaporable getter. While operating temperatures between room temperature and 800 C. are required for non-evaporable getters, the temperatures required for activating these non-evaporable getters range between 660 and 1500 C.
  • This invention therefore, consists of an improvement to a mixed getter device of closed form with a portion of evaporable gettering material disposed within a peripheral groove of a getter device of the already known type, and with a portion of non-evaporable gettering material disposed within a second circular groove, disposed either interiorly or exteriorly concentric of the said first groove and in proximity of the same. in this way, the HP.
  • the positioning of the second groove, more or less near the peripheral groove containing the evaporable portion, provides the means to accordingly control the temperature of the nonevaporable gettering material contained Within said second groove.
  • FiGURE l rows a disc shaped getter device with an external peripheral upset portion defining an upwardly open groove containing an evaporable gettering material 1, and with a second upset portion defining a downwardly open groove, internally concentric with respect to the first one, and containing a non-evaporable gettering material 2;
  • FEGURE 2 also shows a disclilre getter device similar to that of FlGURE 1, wherein instead of the second groove, a circular aperture is foreseen within which a body of non-evaporable gettering material 2, in the form of a fiat ring, is pressed; in this manner both the upper and lower fiat surfaces of the ring 2., as shown, of nonevaporable gettering material are exposed;
  • FIGURE 3 is an annular getter device with a peripheral upwardly open groove containing an evaporable gettering material it, and a second downwardly open groove, internally concentric with respect to the first one, containing a non-evaporable gettering material 2;
  • FIGURES 4, S, 6 and 7 represent additional embodiments of annular getter devices with directing ribs for the vapors of the evaporable gettering material 1, directed inwardly of the ring, wherein the second groove containing the non-evaporable gettering material 2 is located internally concentric with respect to said ring, and is constituted by bending the internal directing rib so as to form said second groove;
  • FIGURES 8 and 9 represent further forms of annular getters with directing flanges tor the vapors of the evaporable gettering material 1, directed inwardly of the ring, wherein the second groove containing the non-evaporable gettering material 2 is located externally of the ring, and is constituted by bending the external directing flange so as to form said second groove.
  • the position of the second groove containing the non-evaporable gettering material 2 will be provided in accordance with the requirements dictated by the geometry for positioning the device within the electronic tube, within the spirit and purpose of this invention, which lies in the utilisation of HF. currents for both the evaporation of the evaporable gettering material, and simultaneously for activating the non-evaporable gettering material of a getter device of the mixed type.
  • the spacing between the respective grooves containing the getter materials determines the relative heating of the two materials, since the high frequency induced currents tend to flow along the outermost peripheral portions of the getter containers.
  • a getter container means having a shape defining a closed peripheral path for the purpose of carrying induced high frequency heating currents, a first upset portion on said container coextensive with said peripheral path defining a first groove, said first groove containing an evaporable gcttering material, and a second upset portion on said container coextensive with said first upset portion and selectively spaced therefrom defining a second groove, said second groove containing a non-evaporable gettering maerial, whereby said high frequency currents in said closed peripheral path simultaneously evaporate and activate, respectively, said evaporable and non-evaporable getterin g materials.
  • said second upset portion is formed FOREIGN PATENTS by upsetting one of said directing flanges. 736,475 9 /55 Great Britain 830,319 3/60 Great Britain.

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Description

July 20, 1965 P. DELLA PORTA MIXED GETTER DEVICES, WITH EVAPORATED AND NOT EVAPORA'I'ED GETTERING MATERIAL, FOR MAINTAINING THE VACUUM IN ELECTRONIC TUBES Filed April 13. 1961 FIG. 2
FIG.3
United States Patent 3,195,716 ll/llXEB GETTER DEVIQES, WITH EVALIURA'EED AND N61 EVAPQRATED GET'EERING MATE- RIAL, FOR MAlNKAlP-ZEJG TEE VACUUM EN ELECTRGNEC EUEES Paolo Della Berta, Via Gallarate 2155, Milan, Italy Filed Apr. 13, 19251, Ser. No. 102,754 6 Claims. (53!. 2tl-.4)
This invention relates to an improvement in getter devices for maintaining the vacuum in electronic tubes, and more particularly, in getter devices of the mixed type having a closed form, such as circular, ring or disc like, containing a portion of evaporable, and a portion of nonevaporable gettering material. Examples of this type of mixed getter device are described and illustrated in FlG- URES 9 and 10 of Italian patent application No. 9,283 of December 29, 1960. One of the problems of the utilisation of non-evaporable gettering material is the necessity of activating it at high temperatures. The invention of the aforesaid application No. 9,283 relates to the problem of maintaining the non-evaporable getter at the necessary operating temperature after the activation. This invention relates, on the contrary, to the problem of activating the non-evaporable getter. While operating temperatures between room temperature and 800 C. are required for non-evaporable getters, the temperatures required for activating these non-evaporable getters range between 660 and 1500 C.
These last mentioned temperatures can be obtained by HE. (high frequency) induced currents that travel on the closed loop provided by the external periphery of getter devices of closed form, such as ringlilre or disclilce. This invention, therefore, consists of an improvement to a mixed getter device of closed form with a portion of evaporable gettering material disposed within a peripheral groove of a getter device of the already known type, and with a portion of non-evaporable gettering material disposed within a second circular groove, disposed either interiorly or exteriorly concentric of the said first groove and in proximity of the same. in this way, the HP. currents, used for the evaporation of the evaporable portion of the getter, are used in the same time for activating the non-evaporable portion of the getter. The positioning of the second groove, more or less near the peripheral groove containing the evaporable portion, provides the means to accordingly control the temperature of the nonevaporable gettering material contained Within said second groove.
In the attached figures there are illustrated several embodiments of the invention. In said drawing:
FiGURE l s rows a disc shaped getter device with an external peripheral upset portion defining an upwardly open groove containing an evaporable gettering material 1, and with a second upset portion defining a downwardly open groove, internally concentric with respect to the first one, and containing a non-evaporable gettering material 2;
FEGURE 2 also shows a disclilre getter device similar to that of FlGURE 1, wherein instead of the second groove, a circular aperture is foreseen within which a body of non-evaporable gettering material 2, in the form of a fiat ring, is pressed; in this manner both the upper and lower fiat surfaces of the ring 2., as shown, of nonevaporable gettering material are exposed;
FIGURE 3 is an annular getter device with a peripheral upwardly open groove containing an evaporable gettering material it, and a second downwardly open groove, internally concentric with respect to the first one, containing a non-evaporable gettering material 2;
FIGURES 4, S, 6 and 7 represent additional embodiments of annular getter devices with directing ribs for the vapors of the evaporable gettering material 1, directed inwardly of the ring, wherein the second groove containing the non-evaporable gettering material 2 is located internally concentric with respect to said ring, and is constituted by bending the internal directing rib so as to form said second groove;
FIGURES 8 and 9 represent further forms of annular getters with directing flanges tor the vapors of the evaporable gettering material 1, directed inwardly of the ring, wherein the second groove containing the non-evaporable gettering material 2 is located externally of the ring, and is constituted by bending the external directing flange so as to form said second groove.
Of course, the position of the second groove containing the non-evaporable gettering material 2 will be provided in accordance with the requirements dictated by the geometry for positioning the device within the electronic tube, within the spirit and purpose of this invention, which lies in the utilisation of HF. currents for both the evaporation of the evaporable gettering material, and simultaneously for activating the non-evaporable gettering material of a getter device of the mixed type. The spacing between the respective grooves containing the getter materials determines the relative heating of the two materials, since the high frequency induced currents tend to flow along the outermost peripheral portions of the getter containers.
What I claim is:
1. In a mixed getter device for maintaining a vacuum in electronic tubes including an evaporable gettering rnaterial and non-evaporable gettering material, a getter container means having a shape defining a closed peripheral path for the purpose of carrying induced high frequency heating currents, a first upset portion on said container coextensive with said peripheral path defining a first groove, said first groove containing an evaporable gcttering material, and a second upset portion on said container coextensive with said first upset portion and selectively spaced therefrom defining a second groove, said second groove containing a non-evaporable gettering maerial, whereby said high frequency currents in said closed peripheral path simultaneously evaporate and activate, respectively, said evaporable and non-evaporable getterin g materials.
2. The invention defined in claim 1, wherein the spacing between said first and second upset portions is selected dependent upon the vaporization and activating temperatures, respectively, of said evaporable and nonevaporable gettering materials.
3. The invention defined in claim ll, wherein said container comprises a circular disc.
4. The invention defined in claim 1, wherein s id second upset portion is perforated to provide an aperture therein and wherein said non-evaporable gettering material is mounted in said aperture.
5. The invention defined in claim l wherein said second upset portion is formed by further upsetting a part of said first upset portion.
6. The invention defined in claim 1, wherein said first upset portion includes peripheral directing flanges for the vapors from said evaporable gettering material therein,
0 0:9 4' and further wherein said second upset portion is formed FOREIGN PATENTS by upsetting one of said directing flanges. 736,475 9 /55 Great Britain 830,319 3/60 Great Britain.
References Cited by the Examiner 1:079746 4/60 Germany UNITED STATES PATENTS 5 2,167,852 8/39 "R THERON E. CONDON, Primary Examiner.
,883 3/62 Meisen Q 20 6-0.4 ARTHUR GAUSS, Examiner.

Claims (1)

1. IN A MIXED GETTER DEVICE FOR MAINTAINING A VACUUM IN ELECTRONIC TUBES INCLUDING AN EVAPORABLE GETTERING MATERIAL AND NON-EVAPORABLE GETTERING MATERIAL, A GETTER CONTAINER MEANS HAVING A SHAPE DEFINING A CLOSED PERIPHERAL PATH FOR THE PURPOSE OF CARRYING INDUCED HIGH FREQUENCY HEATING CURRENTS, A FIRST UPSET PORTION ON SAID CONTAINER COEXTENSIVE WITH SAID PERIPHERAL PATH DEFINING A FIRST GROOVE, SAID FIRST GROOVE CONTAINING AN EVAPORABLE GETTERING MATERIAL, AND A SECOND UPSET PORTION ON SAID CONTAINER COEXTENSIVE WITH SAID FIRST UPSET PORTION AND SELECTIVELY SPACED THEREFROM DEFINING A SECOND GROOVE, SAID SECOND GROOVE CONTAINING A NON-EVAPORABLE GETTERING MATERIAL, WHEREBY SAID HIGH FREQUENCY CURRENTS IN SAID CLOSED PERIPHERAL PATH SIMULTANEOUSLY EVAPORATE AND ACTIVATE, RESPECTIVELY, SAID EVAPORABLE AND NON-EVAPORABLE GETTERING MATERIALS.
US102754A 1961-02-04 1961-04-13 Mixed getter devices, with evaporated and not evaporated gettering material, for maintaining the vacuum in electronic tubes Expired - Lifetime US3195716A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385420A (en) * 1966-04-28 1968-05-28 Getters Spa Getter devices
US4029987A (en) * 1974-04-16 1977-06-14 S.A.E.S. Getters S.P.A. Wide channel getter device
US4297082A (en) * 1979-11-21 1981-10-27 Hughes Aircraft Company Vacuum gettering arrangement
EP0040450A1 (en) * 1980-05-16 1981-11-25 Koninklijke Philips Electronics N.V. Gettering device and picture display tube having such a gettering device
US4481441A (en) * 1981-03-24 1984-11-06 U.S. Philips Corporation Method of manufacturing a picture display tube having a gas-absorbing layer; picture display tube thus manufactured, and gettering device suitable for such a method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2167852A (en) * 1935-10-22 1939-08-01 Rca Corp Electron discharge device
GB736475A (en) * 1952-09-27 1955-09-07 Apparechi Elettrici E Scient S Improvements in getter containers and a method of manufacturing such containers
GB830319A (en) * 1957-04-11 1960-03-16 Siemens Ag Improvements in or relating to velocity-modulated tubes
US3023883A (en) * 1959-03-05 1962-03-06 Philips Corp Getter holder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2167852A (en) * 1935-10-22 1939-08-01 Rca Corp Electron discharge device
GB736475A (en) * 1952-09-27 1955-09-07 Apparechi Elettrici E Scient S Improvements in getter containers and a method of manufacturing such containers
DE1079746B (en) * 1952-09-27 1960-04-14 E S Societa Apparacchi Elettri Getter container
GB830319A (en) * 1957-04-11 1960-03-16 Siemens Ag Improvements in or relating to velocity-modulated tubes
US3023883A (en) * 1959-03-05 1962-03-06 Philips Corp Getter holder

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385420A (en) * 1966-04-28 1968-05-28 Getters Spa Getter devices
US4029987A (en) * 1974-04-16 1977-06-14 S.A.E.S. Getters S.P.A. Wide channel getter device
US4297082A (en) * 1979-11-21 1981-10-27 Hughes Aircraft Company Vacuum gettering arrangement
EP0040450A1 (en) * 1980-05-16 1981-11-25 Koninklijke Philips Electronics N.V. Gettering device and picture display tube having such a gettering device
US4407657A (en) * 1980-05-16 1983-10-04 U.S. Philips Corporation Gettering device and method
US4481441A (en) * 1981-03-24 1984-11-06 U.S. Philips Corporation Method of manufacturing a picture display tube having a gas-absorbing layer; picture display tube thus manufactured, and gettering device suitable for such a method

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