US3610995A - Gas discharge tube comprising a number of electrodes which are united to form a group and are in the form of characters - Google Patents

Gas discharge tube comprising a number of electrodes which are united to form a group and are in the form of characters Download PDF

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Publication number
US3610995A
US3610995A US874570A US3610995DA US3610995A US 3610995 A US3610995 A US 3610995A US 874570 A US874570 A US 874570A US 3610995D A US3610995D A US 3610995DA US 3610995 A US3610995 A US 3610995A
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United States
Prior art keywords
electrodes
gas discharge
discharge tube
envelope
insulating
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Expired - Lifetime
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US874570A
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English (en)
Inventor
Andrianus Anthonius M Hendriks
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US Philips Corp
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US Philips Corp
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    • 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
    • H01J17/491—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with electrodes arranged side by side and substantially in the same plane, e.g. for displaying alphanumeric characters

Definitions

  • the drawback is that a large number of separate tubes have to be provided, so that the mutual distance of the characters which are produced by the tubes is comparatively large, which impedes the reading. Moreover, the use of a number of separate tubes is expensive.
  • the assembly is slid into one envelope having an elongate cross section, which envelope may be provided at both ends with a pinch or a disk-shaped bottom portion through which the current supply wires for the various electrodes are passed in a vacuum-tight manner.
  • the false light dots are formed in that anodes which are situated beside each other can influence each other through the apertures of a gauze electrode which is common for all the groups when characters of adjacent groups light up, so that a light dot can be formed in one or more gauze apertures.
  • this disturbance can be suppressed by providing two gauze electrodes at some distance over each other.
  • FIG. I shows a tube according to the invention
  • FIG. 2 shows an insulating strip for securing the anodes.
  • FIGS. 3 and 4 show an anode
  • FIG. 5 shows an insulating intermediate strip and FIG. 6 shows a strip with a character 2, while,
  • FIG. 7 is a longitudinal cross-sectional view and FIG. 8 is a partial longitudinal cross-sectional view at right angles to the view shown in FIG. 7, ofa tube according to the invention
  • FIG. 9 and 10 show two embodiments of gauze electrodes
  • FIGS. Ila and Ilb are an elevation and a cross-sectional view, respectively, of still another embodiment of a gauze electrode according to the invention.
  • the tube shown in FIG. I comprises a cylindrical glass envelope l which is closed at either end by a bottom part 2.
  • Each bottom part comprises a large number of current supply pins 3 which number depends upon the number of character groups in the tube. Instead of the 10 character groups of the tube as shown, this number may be chosen to be arbitrary.
  • each group of characters is surrounded by an U-shaped anode 7 (FIG. 3), which anodes are supported by means of an insulating strip 4 (FIG. 2).
  • each upright edge of an anode 7 comprises bent sides 8, while the central portion is provided with upright edges 9 which are bent so that they bear on the mica strip 4 with a flat strip I0.
  • the strip 10 comprises a lug 11 the portion II of which can be bent in the recess 5 of the insulating strip 4, so that said strip 4 is rigidly clamped. Since near the comers I3 of each anode two layers of metal overlap each other to in the corners, namely the ends of the bent edges 8 and 9, such a seal is obtained that no ions can travel along the comers to an adjacent anode.
  • the lugs I] and the strips 10 are covered by a mica strip 16 which is provided with recesses l7 which correspond to he recesses 6 of strip 4.
  • Digit strips I8, as is shown in FIG. 6 for the digit 2 are then stacked alternately with insulating strips I6, in which the digit characters 0-9 become situated in the U-shaped anodes 7 (FIGS. 7 and 8).
  • the gauze electrode 22 is laid on the widened upper edges 15 of the plates 14.
  • a second gauze electrode 23 is provided at some distance from the gauze electrode 22, which gauze electrodes are separated from each other by a spacing strip 20 which may be insulating or noninsulating.
  • an insulating plate 2 is provided to which a strip 24 comprising lugs, is secured, which lugs may serve as decimal characters as described in the prior patent application.
  • this strip may also be provided on the upper side.
  • the whole system may be clamped in a metal sheath having a U-shaped cross section (not shown), after which it is inserted into the envelope 1.
  • the envelope may be provided on its inner side with a transparent conductive layer, for example, tin oxide, so as to avoid charging of the glass wall.
  • a transparent conductive layer for example, tin oxide
  • the gauze electrodes are preferably made equal and arranged one behind the other in such manner that the wires of both electrodes lie in each others shade. (FIG. 9). However, it is alternatively possible to use gauze having larger apertures and to provide said electrodes while shifted relative to each other as is shown in FIG. [0.
  • a grid-shaped electrode wound around a com ductive or insulating strip 20 may be used, as is shown in FIGS. Ila and llb, so that the parts of the wire situated in the one plane constitute the electrode 22 and the parts of the wire situated in the other plane constitute the electrode 23, It will be necessary for said electrodes always to have the same potentials so that the strip 20 can consist of metal.
  • a filter may be provided on the glass of the wall of the tube, for example, a red filter, by including silver ions in the glass, as is used for example, for infrared rays.
  • a gas discharge tube comprising an elongate envelope, a plurality of stacks of character-shaped electrodes united to form a group. an anode surrounding each stack. said electrode stacks being arranged beside each other in said envelope with corresponding electrodes of all the groups lying in one plane and the corresponding electrodes of all the groups being at the same time connected together in the form of a strip, the elec trodes located in different planes being stacked one on the other with the interposition of correspondingly shaped strips of insulating material, and means to suppress the mutual in fluence of the stacks, said means comprising a plurality of spaced perforated electrodes between each stack and surrounding anode and the envelope.
  • a gas discharge tube as claimed in claim 1, wherein the means comprises two gauze electrodes which are common for all the groups and are situated at some distance behind each other.
  • a gas discharge tube as claimed in claim 4. wherein insulating partitions which are provided between upright surfaces of adjacent anodes engage in recesses of the insulating strips and comprise a widened upper portion on which one of said gauze electrodes bears.

Landscapes

  • Gas-Filled Discharge Tubes (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US874570A 1968-11-13 1969-11-06 Gas discharge tube comprising a number of electrodes which are united to form a group and are in the form of characters Expired - Lifetime US3610995A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6816125A NL6816125A (de) 1968-11-13 1968-11-13

Publications (1)

Publication Number Publication Date
US3610995A true US3610995A (en) 1971-10-05

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ID=19805132

Family Applications (1)

Application Number Title Priority Date Filing Date
US874570A Expired - Lifetime US3610995A (en) 1968-11-13 1969-11-06 Gas discharge tube comprising a number of electrodes which are united to form a group and are in the form of characters

Country Status (8)

Country Link
US (1) US3610995A (de)
AT (1) AT292137B (de)
BE (1) BE741596A (de)
DE (1) DE1953698A1 (de)
ES (1) ES373405A1 (de)
FR (1) FR2024850A1 (de)
GB (1) GB1223670A (de)
NL (1) NL6816125A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106128910A (zh) * 2016-07-13 2016-11-16 深圳市槟城电子有限公司 一种薄型贴片气体放电管

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106128910A (zh) * 2016-07-13 2016-11-16 深圳市槟城电子有限公司 一种薄型贴片气体放电管

Also Published As

Publication number Publication date
BE741596A (de) 1970-05-12
FR2024850A1 (de) 1970-09-04
ES373405A1 (es) 1972-02-01
GB1223670A (en) 1971-03-03
DE1953698A1 (de) 1970-06-11
NL6816125A (de) 1970-05-15
AT292137B (de) 1971-08-10

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