US2829294A - Cathode ray tuning indicator tube - Google Patents

Cathode ray tuning indicator tube Download PDF

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Publication number
US2829294A
US2829294A US335146A US33514653A US2829294A US 2829294 A US2829294 A US 2829294A US 335146 A US335146 A US 335146A US 33514653 A US33514653 A US 33514653A US 2829294 A US2829294 A US 2829294A
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US
United States
Prior art keywords
cathode
indication
tuning
luminous
indicator tube
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
US335146A
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English (en)
Inventor
Bitter Franz Hermann
Bisterfeld Karl August
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 US2829294A publication Critical patent/US2829294A/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

  • cathode-ray tubes may be used for the substantially powerless indication of voltages, more particularly in the form of zero-voltage indicators or the'like. As an alternative, they may serve for the indication of tuning in amplitude-modulated and frequency-modulated receivers in such manner as to permit indication of tuning either for the two kinds of modulation or in frequency-modulated receivers only.
  • Cathode-ray tubes for voltage indication comprising two cathode-ray beams are known per se.
  • the use thereof involves the disadvantage that the zero-point of the indication is dependent upon influences which can diflicultly be controlled, for example electric or magnetic fields. Marking of the zero position on the luminescent screen thus always involves a certain insecurity.
  • the present invention avoids the above-mentioned disadvantages and is characterised by two cathode-ray beams emanating from the same cathode and directed substantially diametrically, which beams are each subject, independently of one another, to the action of a pair of deflection means, producing two different luminous indications relatively comparablev and independent of one another, on a luminescent screen which exhibits anode potential and which is arranged at an angle with the direction of the ray.
  • a cathode-ray tube for the tuning indication according to the invention may alternatively be so constructed that one pair of deflection means with the associated cathode-ray beam serves for the indication of amplitudemodulated oscillations and the other pair of deflection means with the associated beam serves for the indication of frequency-modulated oscillations.
  • such a cathode-ray tube which comprises two approximately diametric cathode-ray beams and a luminescent screen having anode potential and being approximately in the form of an obtuse cone or part of an obtuse cone, a cathode which may axially'extend through this screen, and four deflection means between cathode and luminescent screen which are provided substantially parallel to the cathode, may be characterised in that three deflection means are connected together and, if desired, to the anode of one amplifying system and the fourth may be connected to the anode of the other amplifying system.
  • a tuning indicator tube may furthermore comprise a luminescent screen having anode potential and being approximately in the form of an obtuse cone or part of an obtuse cone, a cathode which may axially extend through this screen, and four deflection means between cathode and luminescent screen which areprovided substantially parallel to thecathode,
  • Fig. 1 shows the indicator system of a tube according to the invention and Figs. 2, 3 and 4 show some indication images whichv are obtainable therewith.
  • Fig. 1 shows an indicator system according to the invention, which is partly cut open to show the details.
  • a helical grid 2 is provided above a cathode 1 of the conventional type in a manner known per se, four control rods 3 being arranged to be evenly divided around the cathode 1.
  • the assembly is surrounded by a funnellike luminescent screen 4, which is internally coated with fluorescent material, an insulating plate 5 of mica or similar material serving as a support for the whole system.
  • the electrons emanated by the cathode strike the luminescent screen 4, bringing about in known manner luminous sectors which are separated by sector-shaped shadow ranges.
  • the shadow sectors are produced by the control rods 3 in accordance with the potential applied thereto.
  • the helical grid 2 serves in known manner to obtain a virtual cathode having an electron density which is evenly divided over the surface thereof.
  • an indication image is obtained such as shown diagrammatically in Fig. 2.
  • the upper half of the luminescent screen serves for the frequency-modulation indication and the lower half serves for the amplitude-modulation indication.
  • the rods 3 may in pairs be interconnected in a crosswise manner and acquire rela- Patented-Apr.- 1, 1958* macaw;
  • a tuning indication ensues such as shown in Fig. 3.
  • the indication is constituted by two narrow luminous sectors which are in diametrical opposition, the width of the sectors being dependent upon the high frequency-amplitude and hence constant
  • the image shown in the middle is obtained, in which the luminous sectors are positioned vertically, and with tuning to one side-band or the other the luminous rod, constituted by the .two sectors and moving transversely over the luminescent screen, deflects about the centre thereof in one direction of. rotation or the other according to the direction of the variation in tuning.
  • This is clarified by the two positions shown at the right and at the left in Fig. 3.
  • this arrangement atl'ords the advantage that the luminous rod is longer than the luminous index in the known devices, so that a clear indication is obtained.
  • the indicator tube is required to comprise a mark either indicating the vertical position of the luminous rod or permitting an indication of correct tuning.
  • This disadvantage may be obviated if each two adjacent control rods are interconnected and thus united to form one group. An indication thus ensues such as shown in Fig. 4. In this case also the luminous sectors with correct tuning are positioned vertically, that is to say exactly in diametrical opposition.
  • both the upper and the lower luminous sectors are deflected to the left or to the right, so that the luminous rod is apparently kinked at its centre. Correct tuning may in this case readily be ascertained without the use of a mark due to the luminous rod appearing straight instead of kinked.
  • a cathode-ray tuning indicator device comprising a comically-shaped anode having a fluorescent screen on the interior thereof, a cathode member positioned concentrically within said anode and producing a pair of substantially diametrically directed beams, and four control rods symmetrically surrounding said cathode within said anode, and located at the corners of a square defined thereby, three of said control rods being connected together and insulated from the fourth control rod.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US335146A 1952-04-26 1953-02-04 Cathode ray tuning indicator tube Expired - Lifetime US2829294A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE315725X 1952-04-26

Publications (1)

Publication Number Publication Date
US2829294A true US2829294A (en) 1958-04-01

Family

ID=6150269

Family Applications (1)

Application Number Title Priority Date Filing Date
US335146A Expired - Lifetime US2829294A (en) 1952-04-26 1953-02-04 Cathode ray tuning indicator tube

Country Status (5)

Country Link
US (1) US2829294A (es)
BE (1) BE519456A (es)
CH (1) CH315725A (es)
FR (1) FR1076440A (es)
GB (1) GB743268A (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119039A (en) * 1959-07-15 1964-01-21 Philips Corp Tuning indicator tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144575B (en) * 1983-08-05 1988-04-20 English Electric Valve Co Ltd Cathedolumanescent display arrangements

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2051188A (en) * 1935-06-27 1936-08-18 Rca Corp Tuning indicator tube
US2105818A (en) * 1937-06-22 1938-01-18 Rogers Radio Tubes Ltd Voltage indicating electron discharge tube
US2122268A (en) * 1937-09-29 1938-06-28 Rca Corp Tuning indicator tube
FR853504A (fr) * 1938-04-28 1940-03-21 Fides Gmbh Perfectionnements aux lampes indicatrices électriques
US2219506A (en) * 1936-10-08 1940-10-29 Telefunken Gmbh Tuning indicator circuit
GB721599A (en) * 1950-12-27 1955-01-12 Standard Telephones Cables Ltd Amplifying or controlling tube section for the voltages under comparison in voltage-comparing indicator tubes
US2701319A (en) * 1950-11-20 1955-02-01 Radiation Res Corp Electrometer amplifier tube
US2712612A (en) * 1940-07-23 1955-07-05 Lorenz C Ag Voltage reference indicating valve

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2051188A (en) * 1935-06-27 1936-08-18 Rca Corp Tuning indicator tube
US2219506A (en) * 1936-10-08 1940-10-29 Telefunken Gmbh Tuning indicator circuit
US2105818A (en) * 1937-06-22 1938-01-18 Rogers Radio Tubes Ltd Voltage indicating electron discharge tube
US2122268A (en) * 1937-09-29 1938-06-28 Rca Corp Tuning indicator tube
FR853504A (fr) * 1938-04-28 1940-03-21 Fides Gmbh Perfectionnements aux lampes indicatrices électriques
US2712612A (en) * 1940-07-23 1955-07-05 Lorenz C Ag Voltage reference indicating valve
US2701319A (en) * 1950-11-20 1955-02-01 Radiation Res Corp Electrometer amplifier tube
GB721599A (en) * 1950-12-27 1955-01-12 Standard Telephones Cables Ltd Amplifying or controlling tube section for the voltages under comparison in voltage-comparing indicator tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119039A (en) * 1959-07-15 1964-01-21 Philips Corp Tuning indicator tube

Also Published As

Publication number Publication date
FR1076440A (fr) 1954-10-26
BE519456A (es)
CH315725A (de) 1956-08-31
GB743268A (en) 1956-01-11

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