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US3581138A - Gas discharge tube with cold cathode suitable for the simultaneous reproduction of two legible characters - Google Patents

Gas discharge tube with cold cathode suitable for the simultaneous reproduction of two legible characters Download PDF

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Publication number
US3581138A
US3581138A US789773A US3581138DA US3581138A US 3581138 A US3581138 A US 3581138A US 789773 A US789773 A US 789773A US 3581138D A US3581138D A US 3581138DA US 3581138 A US3581138 A US 3581138A
Authority
US
United States
Prior art keywords
characters
groups
frames
discharge tube
gas discharge
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
US789773A
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English (en)
Inventor
Adrianus Anthonius Ma Hendriks
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.)
US Philips Corp
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3581138A publication Critical patent/US3581138A/en
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
    • 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

  • Trifari ABSTRACT A gas discharge tube for reproducing two independently switchable legible characters which adjoin each other and constitute two groups, the characters being secured to annular frames of equal dimensions but having dimensions which are smaller than the frame and the groups being surrounded by a partially perforated anode.
  • the two groups of characters are associated with a single electrode set. Since the characters are smaller than the associated frame, two characters associated with different groups can be reproduced.
  • the present invention relates to a gas discharge tube with a cold cathode, particularly a tube for the simultaneous reproduction of two adjacent, independently switchable legible characters.
  • Such discharge tubes are known but the characters which are located above or beside each other constituted two grouped which were associated with separate electrode sets. Each of the characters was secured in an annular frame which had approximately the same size as the character secured therein, so that in the area of each frame only one character could be reproduced.
  • the two groups of characters are associated with one single electrode set, while the dimensions of the characters are so much smaller than those of the associated frame that within a surface area of a frame two characters associated with different groups can be reproduced.
  • the frames preferably have an elongated rectangular shape in which the characters of one group are secured near one short side, those of the other group being secured near the oppositely located short side of the rectangle of the associated frame. If the groups of characters have to be located above each other, the frames are placed vertically with their long sides. The long sides of the frames will generally be placed parallel to the longitudinal axis of the discharge tube.
  • FIGS. 1, 2, 3 and 4 show frames with letter characters and FIG. 5 shows an insulating member of a given embodiment of the invention.
  • FIGS. 6 and 7 show another embodiment of the invention
  • FIG. 8 shows a gas discharge tube of the embodiment shown in FIGS. 1 to 5.
  • reference numeral 1 denotes a metal frame which is in this case has a substantially elongated shape.
  • the frame may alternatively be, for example, in the form of a circle.
  • the frame 1 comprises apertures 2 to enable the threading on an insulated pin.
  • a character in the form of the letter M is secured on the upper short side of the frame 1.
  • the height of the character is slightly smaller than half of the height of the frame 1.
  • the letter V As shown in FIG. 2, the letter V, referred to by reference numeral 4, is secured in the same manner to the lowest short side of the frame 5, so that within the surface area of the frame two characters can be reproduced which are associated with different groups.
  • the frames 1, 5, l0 and 12 are threaded on pins 15 which are covered with insulating material, separated by insulating plates 6 as shown in FIG. 5. Finally the set obtained is placed in a boxlike anode 16 which consists partly of a wire gauze 17.
  • the tube as shown in FIG. 8 can represent above each other, the letters MV, MA, KV or KA. by providing the characters in the frames while rotated through said characters can also be represented beside each other.
  • the uppermost group will generally furthermore comprise the characters m, n and p and the lower group also the characters 0, F, H and S.
  • the frames 1, 5, l0 and 12 and the insulating plates 6 may be stacked in a U-shaped anode-part 7 as shown in FIGS. 6 and 7 and, by providing a cover 13 which is capable of sliding, in the art 7 they may be secured therein by clamping FIG 6 an 7).
  • the cover 13 may be secured to the side walls of the anode part 7 by welding.
  • the cover 13 is provided with an aperture which is covered by wire gauze 14.
  • insulating strips oran insulating layer 8 are provided against the sidewalls of the U-shaped anode 7.
  • the anode may alternatively be manufactured from aluminum or an alloy hereof and said sidewalls may be covered with an insulating aluminum-oxide layer by electrolytic oxidation.
  • the characters may be constituted by an other symbol.
  • the characters and the associated frames may form one assembly an be punched or etched form a plate but alternatively they may consist of wire and be welded to the associated frame or be obtained by metal deposition.
  • a gas discharge tube for reproducing two independently switchable legible characters which adjoin each other and constitute two groups, the characters each being secured to separate annular frames each of which have the same dimensions and given surface area, the groups being surrounded by an anode gauze between said groups and the viewing wall of said table, comprising the two groups of characters being associated with one single electrode set, each character having dimensions smaller than those of the frame to which it is secured all of said frames being stacked on a pair of insulated pins with adjacent character-supporting frames separated by insulating platelike frames, the characters in adjacent frames being supported at opposite sides of said adjacent frames in nonoverlapping relationship whereby two characters associated with different groups can be reproduced within said surface area.
  • each frame has the form of an elongated rectangle and supports one character which is secured at one side having the shorter dimension.

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  • Gas-Filled Discharge Tubes (AREA)
  • Discharge Lamp (AREA)
US789773A 1968-01-12 1969-01-08 Gas discharge tube with cold cathode suitable for the simultaneous reproduction of two legible characters Expired - Lifetime US3581138A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6800473A NL6800473A (fr) 1968-01-12 1968-01-12

Publications (1)

Publication Number Publication Date
US3581138A true US3581138A (en) 1971-05-25

Family

ID=19802495

Family Applications (1)

Application Number Title Priority Date Filing Date
US789773A Expired - Lifetime US3581138A (en) 1968-01-12 1969-01-08 Gas discharge tube with cold cathode suitable for the simultaneous reproduction of two legible characters

Country Status (8)

Country Link
US (1) US3581138A (fr)
AT (1) AT284975B (fr)
BE (1) BE726770A (fr)
CH (1) CH489113A (fr)
DE (1) DE1816021A1 (fr)
FR (1) FR1599425A (fr)
GB (1) GB1179544A (fr)
NL (1) NL6800473A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006969A (en) * 1974-12-09 1977-02-08 Kabushiki Kaisha Suwa Seikosha Electro-chromic display device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248589A (en) * 1962-12-21 1966-04-26 Csf Multi-cathode display tube
CA779997A (en) * 1968-03-05 P. Stenning George Cold cathode gas discharge tubes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA779997A (en) * 1968-03-05 P. Stenning George Cold cathode gas discharge tubes
US3248589A (en) * 1962-12-21 1966-04-26 Csf Multi-cathode display tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006969A (en) * 1974-12-09 1977-02-08 Kabushiki Kaisha Suwa Seikosha Electro-chromic display device

Also Published As

Publication number Publication date
AT284975B (de) 1970-10-12
GB1179544A (en) 1970-01-28
BE726770A (fr) 1969-07-10
NL6800473A (fr) 1969-07-15
DE1816021A1 (de) 1969-07-31
FR1599425A (fr) 1970-07-15
CH489113A (de) 1970-04-15

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