US3558957A - Multiple cathode indicator tube having improved anode and mercury source - Google Patents

Multiple cathode indicator tube having improved anode and mercury source Download PDF

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Publication number
US3558957A
US3558957A US813257A US3558957DA US3558957A US 3558957 A US3558957 A US 3558957A US 813257 A US813257 A US 813257A US 3558957D A US3558957D A US 3558957DA US 3558957 A US3558957 A US 3558957A
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US
United States
Prior art keywords
capsule
anode plate
anode
tube
envelope
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 - Lifetime
Application number
US813257A
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English (en)
Inventor
Richard B Fehnel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unisys Corp
Original Assignee
Burroughs Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Burroughs Corp filed Critical Burroughs Corp
Application granted granted Critical
Publication of US3558957A publication Critical patent/US3558957A/en
Assigned to BURROUGHS CORPORATION reassignment BURROUGHS CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). DELAWARE EFFECTIVE MAY 30, 1982. Assignors: BURROUGHS CORPORATION A CORP OF MI (MERGED INTO), BURROUGHS DELAWARE INCORPORATED A DE CORP. (CHANGED TO)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/38—Cold-cathode tubes
    • H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/38—Cold-cathode tubes
    • H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
    • H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0069—Tubes for displaying characters

Definitions

  • ABSTRACT An indicator tube having a stack of cathodes 313/174, 313/177, 313/217 and a cylindrical anode enclosing the stack of cathodes.
  • the Int. Cl ..H01j 61/24, anode includes a rear plate and a front screen.
  • the rear anode HOlk 7/04 plate is provided with at least one projecting finger which ex- Field of Search 313/1095, tends toward the cathodes and facilitates cathode glow, and an 174, 177, 179, 205, 206, 210, 217, 251, 251.1, annular mercury capsule is secured to the rear surface of the 309, 356 anode plate by means of metal tabs.
  • the mercury capsule is one ofthese problem components.
  • the mercury, capsule is a metalgor glass container which is mounted in'the tube envelope and carries the.
  • FIG. I is a perspective view of a tubeembodying the invention
  • I 7' FIG. 2 is a side elevational view, partly in section, of a por-v tion of the tube of FIG. 1;
  • FIG. 3 is a plan view of a portion of the tube of FIG. 1;
  • FIG. 4 is a plan view of a modification of the anode electrode shown in FIG. 3; 5
  • FIG. 5 is a plan view of another modification of the anode electrode
  • FIG. 6 is an elevational view of a portion of the structure shown in FIG. 2;
  • FIG. 7 is a sectional view along the lines 7-7 in FIG. 6;
  • FIG. 8 isa sectional view showing a modification of the portion of the tube shown in FIG. 7,.
  • FIG. 9 is a sectional view showing anothermodification of the portion of the tube shown in FIG.;7.
  • An indicator tube 10 embodyingthe invention is shown as a, side viewtube and includes an envelope '20 having a flat dome 30, a viewing window 40,.tnd a stemSiO.
  • the envelope insuitably secured to the anode assembly tobe described.
  • the cathodes have lower tabs which are secured to tube pins 100.
  • the anode assembly in tube 10 comprises a rear anode plate and a frontanode screen 120, the screen and plate comprising a tubular anode which encloses the stack of cathodes.
  • the front screen and rear plate 110 are welded together at their side edges, and their lower ends rest on the stem.
  • the plate and screen are also secured to tube pinsfor mechanical support and to permit the application of voltages thereto.
  • the rear I anode plate may be curved (FIG. 3), or it may have curved side panels' and a flat rear panel 140, (FIG. 4), or it may have that side panels and a flat rear panel (FIG:
  • the panels 150 and 160 being at angles to each other.
  • the front screen may also be completely curved, or it may have fiat portions. 1 1
  • the inner surface of the anode plate is provided with one or more projecting-fingers whichcxtendtoward the lust cathode at the rear of the stack.
  • the projecting fingers may be formed by metallic tabs-or rods welded to the rear plate, or they may be formed by punching tabs out of the rear anode plate and bending them toward-the cathodes.
  • a series of fingers 170 are provided arranged in a vertical column and extending from top to bottom alongthe central vertical axis of the anode plate.
  • Thetube 10 also includes auxiliary cathode electrodes inthe form of decimal points, commas, or any other character.
  • Eachauxiliary electrode is secured to a tube pin and is suitably positioned in the tube with respect to the numeral cathodes.
  • a mercury capsule 200 which compfises a metallic ring having a suitable recess in which aquantity of mercury 20! in a suitable binder is carried
  • the capsule 200 is of relatively large diameter and small thickness and is'secured to the rear surface of the rear anode plate! I0 in any suitable fashion.
  • the-ring capsule-200 is held in place by tabs 210 which are welded to the anode'plate or are punched out ofthe anode plate and are bent over the ring to hold the ring against the anode plate. Two or more such tabs are provided.
  • annular depression 220 (FIG. 8) is formed in the rear surface of the anode plate, and the'ring is held in place in this depression by the tabs 210.
  • the depression may also'be shaped as shown in FIG. 7 so that it includes an annular trough 230 in which the ring fits and a central projection 240 which enters the central opening of thecapsule ring.
  • the anode plate 110 is provided with abutton 250 which rises above the rear surface of the anode plate andenters the central opening of the annular capsule.
  • mercury is released from the ring capsule 200'by heat generated therein, for example, by means of aradio frequency heating coil positioned adjacent to the capsule, as is well known in the art.
  • a multiple cathodegas-filled display tube comprising:
  • said envelope having'a dome at its upper end and a stem at its lower endand a viewing window between the dome and stem; 5
  • an electrode assembly in said envelope including a stack of cathode electrodes facing said viewing window and a cylindrical anode enclosing said stack of cathodes; saidvanode electrode including a rear anode plate and a front anode screen; and said rear anode plate having at least one projecting finger extendingtoward the last cathode at the rear of the stack of cathodes to facilitate the initiation of glow of said last cathode.
  • said rear anode plate includes a plurality of said projecting fingers extending toward said last cathode.
  • a multiple cathode gas-filled display tube comprising:
  • said envelope having a dome at its upper end and a stem at its lower end and a viewing window between the dome and stem;
  • an electrode assembly in said envelope including a stack of cathode electrodes facing said viewing window and a cylindrical anode enclosing said stack of cathodes;
  • said anode electrode including a rear anode plate and a front anode-screenjand vided with an annular depression in which said capsule is seated and secured.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
US813257A 1969-04-03 1969-04-03 Multiple cathode indicator tube having improved anode and mercury source Expired - Lifetime US3558957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81325769A 1969-04-03 1969-04-03

Publications (1)

Publication Number Publication Date
US3558957A true US3558957A (en) 1971-01-26

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US813257A Expired - Lifetime US3558957A (en) 1969-04-03 1969-04-03 Multiple cathode indicator tube having improved anode and mercury source

Country Status (5)

Country Link
US (1) US3558957A (enrdf_load_stackoverflow)
DE (3) DE2012776A1 (enrdf_load_stackoverflow)
FR (1) FR2042754A5 (enrdf_load_stackoverflow)
GB (1) GB1265272A (enrdf_load_stackoverflow)
NL (1) NL7004515A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784862A (en) * 1970-09-11 1974-01-08 Sony Corp Method and apparatus for electron tubes
US3944869A (en) * 1973-04-27 1976-03-16 Burroughs Corporation Display panel with expansible, metallic capsule containing mercury and method of making said capsule
USD624890S1 (en) * 2008-08-18 2010-10-05 Schadeck Matthew A Anode and cathode assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1817445A (en) * 1924-12-31 1931-08-04 Ass Elect Ind Vacuum tube and method of manufacture
US3230027A (en) * 1962-03-28 1966-01-18 Hivac Ltd Method of constructing cold cathode gas discharge tubes
US3244923A (en) * 1962-09-14 1966-04-05 Friden Inc Character representing glow discharge tube and system for selective excitation of the character representing electrodes thereof
US3318649A (en) * 1963-10-11 1967-05-09 King Lab Inc Charging electronic tubes with mercury

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1817445A (en) * 1924-12-31 1931-08-04 Ass Elect Ind Vacuum tube and method of manufacture
US3230027A (en) * 1962-03-28 1966-01-18 Hivac Ltd Method of constructing cold cathode gas discharge tubes
US3244923A (en) * 1962-09-14 1966-04-05 Friden Inc Character representing glow discharge tube and system for selective excitation of the character representing electrodes thereof
US3318649A (en) * 1963-10-11 1967-05-09 King Lab Inc Charging electronic tubes with mercury

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784862A (en) * 1970-09-11 1974-01-08 Sony Corp Method and apparatus for electron tubes
US3944869A (en) * 1973-04-27 1976-03-16 Burroughs Corporation Display panel with expansible, metallic capsule containing mercury and method of making said capsule
USD624890S1 (en) * 2008-08-18 2010-10-05 Schadeck Matthew A Anode and cathode assembly

Also Published As

Publication number Publication date
FR2042754A5 (enrdf_load_stackoverflow) 1971-02-12
NL7004515A (enrdf_load_stackoverflow) 1970-10-06
GB1265272A (enrdf_load_stackoverflow) 1972-03-01
DE7009910U (de) 1970-06-25
DE7009909U (de) 1970-06-25
DE2012776A1 (de) 1970-10-15

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AS Assignment

Owner name: BURROUGHS CORPORATION

Free format text: MERGER;ASSIGNORS:BURROUGHS CORPORATION A CORP OF MI (MERGED INTO);BURROUGHS DELAWARE INCORPORATEDA DE CORP. (CHANGED TO);REEL/FRAME:004312/0324

Effective date: 19840530