US2805352A - Cathode-ray tube for tuning indication - Google Patents

Cathode-ray tube for tuning indication Download PDF

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Publication number
US2805352A
US2805352A US329862A US32986253A US2805352A US 2805352 A US2805352 A US 2805352A US 329862 A US329862 A US 329862A US 32986253 A US32986253 A US 32986253A US 2805352 A US2805352 A US 2805352A
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US
United States
Prior art keywords
tuning
cathode
luminescent
cathodes
screen
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
US329862A
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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
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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
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Publication of US2805352A publication Critical patent/US2805352A/en
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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 cathode-ray indicator tube for the visible tuning of receivers for frequency-modulated or amplitude-modulated Waves, more particularly radio-receivers.
  • cathode-ray beams emanatmg from two separate cathodes to strike from both sides a luminescent screen centrally kinked in the form of a roof, in such manner as to produce two luminescent triangles having points extending into the cathodes and overlapplng base lines of different length, which length may be mfluenced by means for the control of indication, for example control rods, the tuning indication being effected m such manner until base lines are of equal length.
  • the invention relates to a cathoderay indicator tube suitable for the indication of both frec uency-modulated and amplitude-modulated waves, and it is characterized in that a plurality of cathode-ray beams, for example two, strike a luminescent screen with rounded by a control-electrode, preferably a metallic cylinder comprising a longitudinal slot, which is opposed by a fluorescent surface which is at an angle with the cathode surface, it being possible for the control electrodes to be used also as diode paths for the demodulation.
  • An advantageous embodiment of the invention consists in the fluorescent surface carrying a mark indicating correct tuning and being, for example, centrally kinked, slotted or provided with a streak.
  • the two halves of the luminescent screen located at the right and at the left of the middle may alternatively be coated with fluorescent masses of difierent colours.
  • a tuning indicator tube according to the invention may alternatively be constructed in such manner that one, or with each cathode one accelerating anode, approximately in the form of a slotted plate, is provided, in addition, parallel to or at a suitable angle with the cathodes in order to support the action exerted upon the electrons by the positive potential of the luminescent screen, which anode permits, if desired, an additional use of the single system as a triode or, if the luminescent screen consists of two parts, as a tetrode.
  • Fig. 1 is a sectional view of the upper portion of a tuning indicator tube according to the invention.
  • Figs. 2 to 4 are indicator images of the tuning indicator tube with waves modulated in frequency.
  • Fig. 5 to 7 show the same indicator images with waves modulated in amplitude.
  • Fig. 8 shows a modification of a tuning indicator tube according to the invention
  • Fig. 9 is a perspective view of a further embodiment of the indicator system.
  • a glass bulb 1 of a tuning indicator tube contains an inclined luminescent screen 2, the upper side of which carries a fluorescent layer 3.
  • two vertical cathodes 4 are provided, of which in the arrangement shown, one is completely covered by the other, so that one only is visible.
  • Each cathode 4 is surrounded by a metallic cylinder 5 as a control member, which is vertically slotted on the side facing the luminescent screen to allow the electrons to leave the interior.
  • a wedge-shaped electron beam thus ensues, which strikes the luminescent screen, producing thereon a luminescent figure which is likewise wedge-shaped.
  • the width of the wedge and hence the width of the luminescent figure are dependent upon the potential applied to the cylinder 5.
  • the two slots of the control electrodes 5 are provided in such manner that the two luminescent figures produced on the fluorescent screen by the wedge-shaped cathode-ray beams figuratively penetrate oneanother, i. e.,
  • the resultant wedge shape is wide, if the control cylinder exhibits cathode potential or is more positive, and it becomes more and more narrow with increasing negative bias of the cylinder.
  • the two control cylinders are each connected to one of the two circuits coupled with the demodulator. Due to the voltages set up at the circuits, the control cylinders, after rectification of these voltages, acquire different biasing potentials, so that the two luminescent figures exhibit wedges of difierent widths. Consequently,
  • the two electrode systems are indicated by two mately as shown in Fig. 3 is obtained.
  • the tuning means are rotated further, there is tuned to the other side-band and an indication approximately as shown in Fig. 4 is obtained.
  • the shadow triangle 8 which is located between the two luminescent wedges may be used as an index which points vertically upwards with correct tuning.
  • the luminescent screen may, for example, be centrally kinked, slotted, or provided with a streak.
  • the mark may also consist in that the two halves of the luminescent screen located at the right and at the left of the middle are coated with fluorescent masses of different colours.
  • Such a tuning indicator tube may be connected to any arbitrary demodulator, but may alternatively operate itself as a demodulator with suitable circuiting.
  • the two control-cylinders 5 are each connected in a suitable manner to a bandpass filter circuit.
  • the indication obtained with amplitude-modulated waves is similar to that described hereinbefore for frequency-modulated waves and shown in Figs. 2 to 4.
  • Such a circuit afiords the advantage of a very high sensivity of indication.
  • a further possibility of tuning indication of amplitudemodulated waves consists in connecting both control cylinders to the control voltage of the receiver.
  • an indicationof tuning is obtained as shown in Figs. 5 to 7.
  • Both control cylinders then have the same potentialand the two luminescent wedges are hence always identical.
  • a shadow triangle thus ensues, which has its maximum height upon tuning to the carrier wave and which becomes smaller upon change to one side-band or the other. Tuning isthus required to be efiected to the maximum height of theshadow triangle.
  • FIG. 8 is a view at right angles to the tube, thatis to say as viewed from the right.
  • the component parts of the. tube are provided with the same reference numerals as in Fig. 1, and it may be seen that the arrangement of the cathodes 4, the control cylinders 5 and the luminescent screen 2 substantially corresponds to that shown in Fig. 1, except thatthe whole arrangement is rotated by 90 relatively to the axis of the tube. .
  • This arrangement afiords the advantage that the surface of the luminescent screen 2 may make. a considerably larger angle with the plane passing through the cathodes 4. An indicator image is thus obtained, which is larger'and more clearly visible.
  • an accelerating anode may be provided parallel to the cathodesorata suitable angle therewith.
  • the accelerating anode may approximately have a the shape of a slotted metallic plate and be connected to the anode of the luminescent screen. It serves to support the action exerted upon-the electrons by the positive potential of the luminescent screen.
  • control cylinders 5 with longitudinal slots 9 are provided above the rod-shaped parallel cathodes 4.
  • An accelerating anode plate 10 is provided parallel to the plane assumed to pass through the cathodes 4, which plate It) is provided with two slots for the passage of the electrons and is connected to the luminescent screen 2. The latter is centrally provided with a mark 12 in the form of a streak extending in the length thereof.
  • the luminescent screen shown in Fig. 9 may alternatively be separated from the accelerating anode 10, so that voltages of difierent values may be applied to them.
  • the single systems each of which comprises the cathode 4, the control cylinder 5 and the accelerating anode 10, to be used as a triode system, if the accelerating anode 10, contrary to Fig. 9, is separated in the longitudinal direction and hence made in two parts.
  • the systems may alternatively be used as a tetrode if, furthermore, the luminescent screen is made in two parts.
  • a cathode-ray indicator tube for tuning frequencyand amplitude-modulated receivers comprising a substantially flat plate having a luminescent screen on .one surface thereof, means. located on the side of said plate facing said screen for producing a pair of separate electron beams whose axes are inclined toward each other and which impact a common portion of the luminescent screen, whereby the images produced thereby on the screen overlap, and means associated with said beam producing means for independently controlling each of the electron beams.
  • a cathode-ray indicator tube for tuning frequencyand amplitude-modulated radio receivers comprising a pair of adjacent elongated cathodes lying in substantially the same plane and having parallel longitudinal axes extending in said plane, a substantially flat plate having a luminescent screen on one surface thereof facing both of said cathodes, said plate being inclined with respect to said plane of said cathodes, and a pair of longitudinally slotted metallic cylinders each surrounding one of said cathodes, s'aid combined cathodes and cylinders producing a pair of separate electronbeams-which impact a corncating mark to indicate when'the receiver is properly tuned.
  • a cathode-ray indicator tube for tuning frequencyand amplitude-modulated radio receivers comprising a pair of parallel adjacentelongated cathodes having longitudinal axes lying in the same plane, a substantially flat luminescent screen facing both of said cathodes and having one end closer to.
  • a concentric longitudinally-slotted metallic cylinder surrounding each of said cathodes, said cathodes and cylinders producing a pair of separate electron beams which are inclined toward each other and which impart a common portion of the luminescent screen to produce overlapped images on theiluminescent screen,'and a slottedplate accelerating anode associated with each of said cathodes and being disposed between said screen and said cylinders, said metallic cylinders of said cathodes being insulated from one another, whereby they may be separately excited.
  • a cathode-ray indicator tube for tuning frequencya having a luminescent surface thereon, first means located.
  • first beam control means associated with said first beam producing means
  • second beam control means associated with said second beam producing means, said first and second beam control means being separately controllable.

Landscapes

  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
US329862A 1952-02-08 1953-01-06 Cathode-ray tube for tuning indication Expired - Lifetime US2805352A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE750304X 1952-02-08
DEP7078A DE959481C (de) 1952-02-08 1952-02-09 Elektronenstrahl-Abstimmanzeigeroehre

Publications (1)

Publication Number Publication Date
US2805352A true US2805352A (en) 1957-09-03

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ID=25947548

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Application Number Title Priority Date Filing Date
US329862A Expired - Lifetime US2805352A (en) 1952-02-08 1953-01-06 Cathode-ray tube for tuning indication

Country Status (7)

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US (1) US2805352A (en(2012))
BE (1) BE517504A (en(2012))
DE (1) DE959481C (en(2012))
FR (1) FR1070683A (en(2012))
GB (1) GB750304A (en(2012))
IT (1) IT500148A (en(2012))
NL (1) NL82773C (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161800A (en) * 1940-07-23 1964-12-15 Int Standard Electric Corp Indicator tube having two indication systems

Citations (5)

* 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
US2243408A (en) * 1938-05-12 1941-05-27 Rca Corp Visual tuning indicator
US2394857A (en) * 1940-07-23 1946-02-12 Rca Corp Electron ray indicating device
US2594025A (en) * 1949-09-09 1952-04-22 Siemens Ag Electron tube with luminescent shield, especially tuning tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL57947C (en(2012)) * 1935-06-27
GB687261A (en) * 1945-07-24 1953-02-11 Gen Electric Improvements relating to electric discharge devices

Patent Citations (5)

* 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
US2243408A (en) * 1938-05-12 1941-05-27 Rca Corp Visual tuning indicator
US2394857A (en) * 1940-07-23 1946-02-12 Rca Corp Electron ray indicating device
US2594025A (en) * 1949-09-09 1952-04-22 Siemens Ag Electron tube with luminescent shield, especially tuning tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161800A (en) * 1940-07-23 1964-12-15 Int Standard Electric Corp Indicator tube having two indication systems

Also Published As

Publication number Publication date
IT500148A (en(2012))
DE959481C (de) 1957-03-07
FR1070683A (fr) 1954-08-05
BE517504A (en(2012))
GB750304A (en) 1956-06-13
NL82773C (en(2012))

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