US3708714A - Electrostatic deflection type cathode-ray tube with a plurality of electron guns - Google Patents

Electrostatic deflection type cathode-ray tube with a plurality of electron guns Download PDF

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Publication number
US3708714A
US3708714A US00055678A US3708714DA US3708714A US 3708714 A US3708714 A US 3708714A US 00055678 A US00055678 A US 00055678A US 3708714D A US3708714D A US 3708714DA US 3708714 A US3708714 A US 3708714A
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United States
Prior art keywords
ray tube
electron
electrostatic deflection
deflection type
type cathode
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Expired - Lifetime
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US00055678A
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English (en)
Inventor
M Kimura
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.)
Panasonic Holdings Corp
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Matsushita Electronics Corp
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Filing date
Publication date
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only

Definitions

  • This invention relates to an electrostatic deflection type cathode-ray tube provided with a plurality of electron guns.
  • the present invention has as its principal object eliminating such distortion as mentioned above, and in addition, providing the technical advantages of improving the intensity of traces and of facilitating the observation ofhigh-speed phenomena.
  • FIG. 1 is a side sectional view of a prior art cathoderay tube of the electrostatic deflection type
  • FIG. 2 is a front view of the prior art cathode-ray tube
  • FIG. 3 is a side sectional view of an electrostatic deflection type cathode-ray tube embodying the invention.
  • FIG. 4 is a side sectional view for illustrating the essential portions of the embodiment.
  • a first electron gun l and a second gun 2 juxtaposed thereto at an inclination of a are accommodated in the neck portion of a bulb 3.
  • a phosphor screen 4 is attached on the inner wall surface of the face panel of the bulb 3.
  • the inner wall surface of the funnel portion has first and second conductive films 5 and 6 applied thereon.
  • a post-acceleration electrode system formed by the conductive films 5 and 6 exerts an accelerating action upon electron beams 7 and 8 which are respectively emitted from the electron guns l and 2.
  • a convergent electron lens 9 formed by the electrode system imparts a deflecting action on the electron beams to the tube axis.
  • the electron beams 7 and 8 impinge upon the common phosphor screen 4, and produce their respective traces thereon.
  • the trace drawn by the first electron gun 1 and that depicted by the second gun 2 appear in regions represented by A and B in FIG. 2, respectively.
  • Y-axial sensitivity varies in the vertical direction on the face of the phosphor screen 4, and the Y traces become nonperpendicular on both extreme sides.
  • Such distortion will appear more conspicuously, as the VJV, ratio becomes larger between the voltages V, and V applied to the conductive films 5 and 6, respectively, which constitute the post-acceleration electrode system.
  • the mutual inclining angle [3 between the first electron gun I and the second gun 2 juxtaposed thereto is made larger than the aforementioned value (1, and further, a mesh electrode 10 is interposed between the electron guns 1, 2 and the phosphor screen 4'.
  • An angle fi/2; that is, the angle at which the first electron gun I or the second gun 2 is inclined with respect to the axis of the cathode-ray tube may be usually selected from a range of 2.5 to 7.5".
  • a lens-characteristics correcting annulus 11 is obliquely arranged in such a way as to surround the mesh electrode 10, and therewith, an internal conductive film 12 is deposited on the inner wall surface of the funnel portion of the bulb 3 in a manner to correspond to the mesh electrode 10.
  • a metal backing layer 13 is connected with the internal conductive film 12, while a metallic shielding cylinder 14 is connected with the mesh electrode 10 to support it.
  • the mesh electrode 10 has a voltage V of approximately 800 to 3,000V applied thereto, while the internal conductive film 12 is impressed with a voltage V two to ten times as high as the voltage V i.e., amounting usually to approximately 4,000 to 25,000V.
  • a voltage V applied to the lens-characteristics correcting annulus 11 is appropriately selected.
  • the electron lens 15 exerts a diverging action upon the electron beams 7 and 8 flowing respectively from the electron guns I and 2 which are disposed at the angle 5, and thereby the incident angles of the respective electron which strikes upon the phosphor screen 4 are made smaller than those in FIG. 1.
  • an electron beam emitted from one electron gun and subjected to a divergent type deflecting action with the electron lens is herein refracted at angles of 0 9 and 0 it being possible to establish, through the effect of the lenscharacteristics correcting annulus 11 and, if necessary, through the effect of curvation of the mesh 10, the condition of 6: 0 8
  • the geometry distortion of rastor may be reduced which is due to the inclined disposition of the electron guns with respect to the tube axis.
  • the reference numeral 16 designates one of the equipotential lines.
  • the configuration and arrangement of the conductive film 12 as well as the lens-characteristics correcting annulus 11 may be subject to suitable modifications. In addition, it is permitted to couple the lens-characteristics correcting annulus 11 with the mesh electrode or to form the former integrally with the latter. Also, in addition, the ring 11 may be dispensed with.
  • a mesh electrode is disposed between a phosphor screen and at least two electron guns are juxtaposed with their axes inclined with respect to the tube axis; a divergent electron lens is formed by the mesh electrode, an internal conductive film and, if necessary, a lens-characteristics correcting annulus; and electron beams emitted from the electron guns have their incident angles upon the screen made narrower.
  • An electrostatic deflection type cathode-ray tube wherein a mesh electrode is interposed between a phosphor screen and at least two electron guns juxtaposed with each of their axes inclined at Bl2 with respect to the axis of said cathode-ray tube, and wherein a post-accelerating electrode system for formation of a divergent electron lens is provided by means of an internal conductive film deposited on the inner wall surface of the funnel portion of the bulb of said cathode-ray tube and said mesh electrode.
  • An electrostatic deflection type cathode-ray tube according to claim 1, wherein said post-accelerating electrode system comprises an annular electrode for correcting the characteristics of said electron lens, which electrode is arranged to surround said mesh electrode.
  • An electrostatic deflection type cathode-ray tube according to claim 1, wherein the axes of said at least two electron guns intersect to each other before said phosphor screen.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US00055678A 1969-07-23 1970-07-17 Electrostatic deflection type cathode-ray tube with a plurality of electron guns Expired - Lifetime US3708714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44059562A JPS4819097B1 (fi) 1969-07-23 1969-07-23

Publications (1)

Publication Number Publication Date
US3708714A true US3708714A (en) 1973-01-02

Family

ID=13116790

Family Applications (1)

Application Number Title Priority Date Filing Date
US00055678A Expired - Lifetime US3708714A (en) 1969-07-23 1970-07-17 Electrostatic deflection type cathode-ray tube with a plurality of electron guns

Country Status (5)

Country Link
US (1) US3708714A (fi)
JP (1) JPS4819097B1 (fi)
DE (1) DE2036451C3 (fi)
FR (1) FR2055496A5 (fi)
GB (1) GB1256195A (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783326A (en) * 1972-09-18 1974-01-01 Rca Corp Magnetically-focussed cathode-ray tube comprising a tilted and skewed off-axis electron gun
US4196371A (en) * 1978-04-05 1980-04-01 Tektronix, Inc. Shock-absorbing means for mesh-carrying member of a cathode ray tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2804029A1 (de) * 1978-01-31 1979-08-02 Licentia Gmbh Kathodenstrahlroehre mit zweistrahl- elektrodensystemen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179916A (en) * 1935-01-31 1939-11-14 Philips Nv Electron tube
US2933640A (en) * 1958-04-30 1960-04-19 Bell Telephone Labor Inc Pulse coincidence detecting tube
US3497763A (en) * 1967-12-22 1970-02-24 Philips Corp Grid to compensate for astigmatic quadrupolar lens
US3537097A (en) * 1968-01-02 1970-10-27 Donald G Gumpertz System including a cathode ray display tube for providing a visual indication of a plurality of characters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179916A (en) * 1935-01-31 1939-11-14 Philips Nv Electron tube
US2933640A (en) * 1958-04-30 1960-04-19 Bell Telephone Labor Inc Pulse coincidence detecting tube
US3497763A (en) * 1967-12-22 1970-02-24 Philips Corp Grid to compensate for astigmatic quadrupolar lens
US3537097A (en) * 1968-01-02 1970-10-27 Donald G Gumpertz System including a cathode ray display tube for providing a visual indication of a plurality of characters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783326A (en) * 1972-09-18 1974-01-01 Rca Corp Magnetically-focussed cathode-ray tube comprising a tilted and skewed off-axis electron gun
US4196371A (en) * 1978-04-05 1980-04-01 Tektronix, Inc. Shock-absorbing means for mesh-carrying member of a cathode ray tube

Also Published As

Publication number Publication date
GB1256195A (en) 1971-12-08
DE2036451C3 (de) 1974-05-09
DE2036451B2 (de) 1973-10-18
DE2036451A1 (de) 1971-02-04
FR2055496A5 (fi) 1971-05-07
JPS4819097B1 (fi) 1973-06-11

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