US3119039A - Tuning indicator tube - Google Patents

Tuning indicator tube Download PDF

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Publication number
US3119039A
US3119039A US41359A US4135960A US3119039A US 3119039 A US3119039 A US 3119039A US 41359 A US41359 A US 41359A US 4135960 A US4135960 A US 4135960A US 3119039 A US3119039 A US 3119039A
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US
United States
Prior art keywords
cathode
deflector
strip
electrodes
electrode
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
US41359A
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English (en)
Inventor
Elvers Ernst Gunter
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
North American Philips Co Inc
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 US3119039A publication Critical patent/US3119039A/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
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/14—Magic-eye or analogous tuning indicators

Definitions

  • This invention relates to a tuning indicator tube to indicate several measured values.
  • Such tubes generally have a separate electrode system, in which the electron beams emitted from a cathode are deflected by deflector electrodes and impinge on a fluorescent screen.
  • the fluorescent screen has the shape of a strip.
  • the strip of the fluorescent screen is illuminated from its ends by the impinging electrons.
  • the deflector electrodes of these tubes are shaped as rods which are arranged one behind the other in the direction of the electron beam; they render the indication of only one measured value possible.
  • the object of the invention is to provide a tube of simple structure giving a conspicuous and at the same time quiet indication.
  • deflector electrodes In a tuning indicator tube according to the invention for the indication of several measured values, deflector electrodes, separated from one another in a conductive manner with an insulation layer, therebetween, are pro vided in parallel and close beside one another in the electron path between an emission system and the fluorescent screen and are combined into one set.
  • the central plane of the set of electrodes consisting of the deflector electrodes and the insulation layer is provided in a plane extending at right anglesto the fluorescent screen and-through the center of the cathode.
  • the indication is effected, as is the case with the known tuning indicator tubes having a strip-shaped fluorescent screen and only one deflector electrode system, by reducing the dark zone between the strip ends.
  • the illuminated zones widen independently of one another, since the illuminated zone extending from the one strip end is controlled by the one deflector electrode and the illuminated zone extending from the other strip end is controlled by the other deflector electrode.
  • the bright-dark boundaries invariably extend at right angles to the strip axis.
  • FIG. 1 is a diagrammatic sectional view through the electrode system according to the invention
  • FIG. 2 is the elevation A as shown in FIG. 1 of the fluorescent screen
  • FIG. 3 is a sectional View of the arrangement of the deflector electrodes through the line B-C shown in FIG. 1.
  • the cathode 1 shown in FIG. 1 of a tuning indicator tube is surrounded by a reflection grid 2, the support rods '3 of which are both provided on one side of the cathode.
  • a light screen 6 is provided on the tube wall 5, on which electron beams 7, 8 emerging from the cathode 1 and the grid 2 impinge.
  • deflector plates 9, 10 are provided closely engaging one another at equal distance from the emission system with the interposition of an insulation layer 11, for example of mica.
  • Both the cathode 1 and the grid 2, and also the anode 4 and the deflector plates 9 and 10 are in known manner provided with and held by slices of insulation material 12.
  • the deflection voltages supplied to the deflector plates may be produced either in a separate double triode or in two 'triodes likewise provided in the envelope of the tube.
  • the electron beams 7 and 8 first impinge in two beams on the ends of the fluorescent screen 6 constituted by the strip (FIG. 2). lit the potential at the one deflector plate 9 is increased. the electron beam 7, which is opposite to this deflector plate 9, is dispersed in the direction of the plate 9. The electron beam 8 opposite to the other plate 19 is only slightly influenced by the potential variation. Only if the potential of the other plate 10 is changed, the electron beam 8 also situated opposite to this plate experiences a change. Both beams 7 and 8 are consequently controlled independently from one another. This independent control is noticeable on the fluorescent screen 6 because the illuminated zones 14 starting at the strip ends cover different distances towards the center of the strip (FIG. 2).
  • the tags 15 are connected to voltage supply conductors not shown.
  • An electron discharge device for indicating several measured values comprising an evacuated envelope, a
  • cathode within said envelope, a grid electrode spaced from said cathode, a target electrode spaced from the cathode, an anode electrode, and a pair of deflector electrodes positioned between the grid electrode and the target electrode perpendicular to the path of an electron beam generated by die cathode, said deflector electrodes being positioned in parallel to and in close adjacency to one another and being separated from one another by a layer of insulation therehetween whereby no electrons can pass between said deflector electrodes.
  • a tuning indicator tube as claimed in claim 1 in which the deflector plates project beyond the insulating layer and are bent over one side of said layer.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US41359A 1959-07-15 1960-07-07 Tuning indicator tube Expired - Lifetime US3119039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP23174A DE1216443B (de) 1959-07-15 1959-07-15 Abstimmanzeigeroehre zur Anzeige von zwei Messwerten

Publications (1)

Publication Number Publication Date
US3119039A true US3119039A (en) 1964-01-21

Family

ID=7369087

Family Applications (1)

Application Number Title Priority Date Filing Date
US41359A Expired - Lifetime US3119039A (en) 1959-07-15 1960-07-07 Tuning indicator tube

Country Status (6)

Country Link
US (1) US3119039A (en))
CH (1) CH392708A (en))
DE (1) DE1216443B (en))
FR (1) FR1269375A (en))
GB (1) GB960410A (en))
NL (1) NL112950C (en))

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2829294A (en) * 1952-04-26 1958-04-01 Philips Corp Cathode ray tuning indicator tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513908A (en) * 1940-07-23 1950-07-04 Gen Electric Electric discharge device of the indicator type
GB725373A (en) * 1952-05-02 1955-03-02 Philips Electrical Ind Ltd Improvements in or relating to measuring or indicating instruments

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2829294A (en) * 1952-04-26 1958-04-01 Philips Corp Cathode ray tuning indicator tube

Also Published As

Publication number Publication date
GB960410A (en) 1964-06-10
CH392708A (de) 1965-05-31
DE1216443B (de) 1966-05-12
NL112950C (en)) 1966-05-18
FR1269375A (fr) 1961-08-11

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