US2225479A - Electric discharge tube - Google Patents

Electric discharge tube Download PDF

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Publication number
US2225479A
US2225479A US233362A US23336238A US2225479A US 2225479 A US2225479 A US 2225479A US 233362 A US233362 A US 233362A US 23336238 A US23336238 A US 23336238A US 2225479 A US2225479 A US 2225479A
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US
United States
Prior art keywords
electrode
screen
electrodes
aperture
cathode
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
US233362A
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English (en)
Inventor
Jonker Johan Lodewijk Hendrik
Moubis Gerard Charles An Marie
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.)
RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
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Publication of US2225479A publication Critical patent/US2225479A/en
Anticipated expiration legal-status Critical
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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

  • PatentedDec. 17; 1940 an-electric discharge t'ube for indicatin'g'voltages' hereinafter termed tuning indicator,
  • the electrode 6 has formed init a star- 45 shaped aperture and the divergent beam formed v by the electrodes 4 and 5 passes for a small part through this aperture and then falls on to a fluorescent screen 9 arranged at'the end of the tube 1 thereby forming an enlarged replica of the aper- 60 ture, on the fluorescent screen.
  • the electrode 4 of the lens is connected to the point whose voltage is to be reproduced optically; In the circuit shown this is a point of a wireless receiving circuit in which the tube l indicates the tuning of a 88 "I'he diaphragm-may be internally connected to r set.
  • the circuit comprises a diode which detects the high-frequency alternating voltage and thus sets up a potential difiference across the resistances I l and [2.
  • the point A is thus given a positive voltage which is supplied to the electrode 4 through an electric filter formed by a resistance I5 and condensers l3 and M.
  • the said electrode 4 is given a negative bias relatively to the cathode 2 since the latter is connected to a tap.
  • this electrode 4 is established so that the image on the fluorescent screen has minimum di--' mensions. If the negative voltage of the electrode 4 is decreased due to the fact that the point A is given a positive voltage, the dimensions of the fluorescent image are increased. The point A is most positive when the set is tuned completely and the correct tuning is therefore found by adjusting to the maximum size of the image on the fluorescent screen. As an alternative, the electrode 4 may be given a positive bias and in this case the negative voltage is tapped off, for example, the point B. Thus the size of the fluorescent image decreases on the set approaching its tuning. In the circuit shown the resistances H and [2 form a potentiometer the point C' of which is earthed.
  • the electrode 4 may have supplied to it anyvoltage to be measured and the invention is not limited to the use of tuning indicators in wireless receiving sets.
  • An electronic tuning indicator tube having an electrode structure consisting of an electron source to generate an electron beam, an electron responsive target oppositely disposed from said electron source, a pair of electrically connected apertured electrodes with their apertures axially aligned between said electron source and said target and the electrode of said pair nearer the said target being the electrode most adjacent said target, an intermediate apertured electrode between said pair of electrodes, electrode means between said two electrodes and said electron source to control the divergence of the electron beam through the aperture of said intermediate electrode to electronically image the aperture in said intermediate electrode over continuallydiverging paths on said target.
  • An electronic tuning indicator tube comprising an evacuated envelope enclosing a source of electrons and electrode structure consisting of an oppositely disposed target adapted to become luminescent when bombarded with electrons from said source, means comprising an apertured anode to maintain the emission from said source substantially constant, three axially aligned apertured electrodes between said anode and said target, the aperture of the intermediate electrode 0 0f said three electrodes being non-circular and one of said three electrodes being wholly exposed to said target and being the nearest to said target ping of the potentiometer 8.
  • An electronic indicator tube having an evacuated envelope enclosing a fluorescent screen, a cathode oppositely disposed from said screen, a pair of electrically connected apertured electrodes between said cathode and said screen, one of said pair of electrodes being closer said screen than any other electrode in said tube, an electrode having a noncircular aperture, said electrode being positioned between said pair of electrodes, and
  • An electronic tuning indicator tube having an evacuated envelope, a fluorescent screen within said envelope, and electrode structure within said envelope comprising a cathode oppositely disposed from said screen, a system of three-apertured electrodes between said cathode and said screen, the electrode of said system nearest said screen being the closest electrode to said screen of all the electrodes within said envelope to cause electrons emitted from said cathode to follow paths toward said'screen which continuously diverge over the distance separating said system of electrodes from said screen, and means including an apertured electrode between said three electrodes and said cathode to maintain the diameter of the beam impinging on the intermediate electrode of' said system of three electrodes greater than the aperture in said intermediate'electrode to image said aperture on said screen.
  • An electronic indicator tube having an envelope enclosing an electron source to emit a beam of electrons, an anode adjacent said source to accelerate the beam of electrons, a fluorescent screen oppositely disposed from said source to receive electrons from said source, a noncircular electrode having an aperture axially aligned with said cathode and anode between said anode and said screen, the noncircular electrode on each side of said electrode having an aperture, and electrode means between said electron source and the next adjacent electrode in the direction from said source to said screen to direct upon said screen a beam of electrons having a constantly increasing diameter throughout thespace from said electrode having the aperture to said screen to image an enlarged replica of said noncircular aperture on said anode.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US233362A 1937-10-13 1938-10-05 Electric discharge tube Expired - Lifetime US2225479A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL205234X 1937-10-13

Publications (1)

Publication Number Publication Date
US2225479A true US2225479A (en) 1940-12-17

Family

ID=19778514

Family Applications (1)

Application Number Title Priority Date Filing Date
US233362A Expired - Lifetime US2225479A (en) 1937-10-13 1938-10-05 Electric discharge tube

Country Status (5)

Country Link
US (1) US2225479A (enrdf_load_html_response)
CH (1) CH205234A (enrdf_load_html_response)
FR (1) FR844672A (enrdf_load_html_response)
GB (1) GB519263A (enrdf_load_html_response)
NL (1) NL50269C (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568112A (en) * 1946-12-24 1951-09-18 Csf Voltage divider for variable magnification electron microscopes
US2632115A (en) * 1947-06-21 1953-03-17 Csf Focusing device for electron microscopes
US2859378A (en) * 1956-05-21 1958-11-04 Gen Electric Electrode system for cathode ray tubes
US2922073A (en) * 1955-03-22 1960-01-19 Kendon Electronics Inc Color reproduction systems of the cathode ray tube type
US3619706A (en) * 1966-09-28 1971-11-09 Rank Organisation Ltd Cathode-ray tube in which screening electrodes are provided at the electron gun to produce a beam of uniform density over its cross section along its path to the display screen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1089485B (de) * 1952-07-16 1960-09-22 Standard Elektrik Lorenz Ag Spannungs- und Spannungsvergleichs-anzeigeroehre

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568112A (en) * 1946-12-24 1951-09-18 Csf Voltage divider for variable magnification electron microscopes
US2632115A (en) * 1947-06-21 1953-03-17 Csf Focusing device for electron microscopes
US2922073A (en) * 1955-03-22 1960-01-19 Kendon Electronics Inc Color reproduction systems of the cathode ray tube type
US2859378A (en) * 1956-05-21 1958-11-04 Gen Electric Electrode system for cathode ray tubes
US3619706A (en) * 1966-09-28 1971-11-09 Rank Organisation Ltd Cathode-ray tube in which screening electrodes are provided at the electron gun to produce a beam of uniform density over its cross section along its path to the display screen

Also Published As

Publication number Publication date
NL50269C (enrdf_load_html_response)
CH205234A (de) 1939-06-15
FR844672A (fr) 1939-07-31
GB519263A (en) 1940-03-20

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