US2954499A - Electron-optical system and method - Google Patents

Electron-optical system and method Download PDF

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Publication number
US2954499A
US2954499A US724147A US72414758A US2954499A US 2954499 A US2954499 A US 2954499A US 724147 A US724147 A US 724147A US 72414758 A US72414758 A US 72414758A US 2954499 A US2954499 A US 2954499A
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US
United States
Prior art keywords
deflection
lens
electron
screen
plane
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
US724147A
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English (en)
Inventor
Gundert Eberhard
Vibrans Gerwig
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2954499A publication Critical patent/US2954499A/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
    • 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
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching

Definitions

  • the invention relates to an electron-optical system for cathode ray tubes employing after-acceleration of the deflected beam.
  • this after-acceleration takes place between the deflection means closest to the screen and the screen itself.
  • convergent after-acceleration occurs primarily only in the plane of deflection caused by the last mentioned deflecting means.
  • an intermediate image is produced between the screen and the deflection means which is closest to the cathode, whereby this intermediate image appears reversed on the screen only in one of the deflection planes.
  • the main image on the screen is derived from said intermediate image by after-acceleration.
  • Fig. 3a illustrates schematically a side view of an electron-optical system according to the invention.
  • Fig. 4 illustrates schematically a side view of a cathode ray tube incorporating an electron-optical system according to the present invention.
  • y denotes the potential along a center axis Z of an axially symmetrical electronoptical system showing that the after-acceleration potential gradient follows the curve a or b.
  • the portion a of the curve a is bent upwardly, thereby causing a converging effect in the electron beam.
  • the portion a" of the curve a is bent downwardly, thus causing a diverging effect in the beam.
  • the curve b is bent upwardly over its entire length, causing a converging effect on the beam over the entire length of the field.
  • a cathode 1 emits electrons l intersecting at a point 2 due to the concavity of the emitting surface of this cathode.
  • the system includes a main focusing lens 3.
  • a deflecting field 4 is set up, said field acting in the plane of the drawing.
  • the after-acceleration lens 5 produces an image of the center point 7 of deflection at 8, i.e., at the point where the beam intersects the axis Z.
  • This point 8 ordinarily has such a distance from the screen 6 that the overall or total deflection 20 of the beam is sufli- -Theimageof point 2 in plane 21 has to be sutficiently 5 small in order to obtain a sharply focused spot 9 on the screen 6.
  • I can be obtained by determining a minimum beam angle 8 at the screen and preventing the diameter of the beam in the after-acceleration lens 5 from becoming too small.
  • the main converging lens 5 has to 10 be positioned as close as possible to the plane 21 in order to avoid an unnecessarily large diameter of the beam within this lens 5.
  • An acceleration field can be produced for example by a helical coating at the inner surface of the bulb.
  • a helical coating is schematically shown in the Figs. 3a and 3b by the dotted lines 17.
  • 10 denotes an after-acceleration field component having a curve particularly useful for the invention. This component 10 of the after-acceleration field is convergent only in the plane of the drawingof Fig. 3a, while a component 15 of this field is effective divergently only in the plane of the drawing of Fig. 3b.
  • the field component 111' is, for example, cooperative witht-the deflection plates 11 (Fig. 3a) which are the deflection means nearest the screen, while the component 15 is, for example, cooperative with the deflection plates 14 (Fig. 3b) which are the deflection means disposed nearest the cathode.
  • the beam is bent towards the axis Z in the deflection plane of Fig. 3a only if the after-acceleration is sufficiently great.
  • the intermediate image of the electron spot now appears at point. 12 in the plane of Fig. 3a.
  • the image appears on line 12' in'Fig. 3b.
  • a lens 13 provided for proper adjustment of the image 12,12f is positioned between the deflection plates 14, 14' and the plates 11, 11'.
  • the main converging lens 16 may be axially symmetrical, cylindrical or t-oric.
  • FIG 4 is a schematic representation of a cathode ray tube incorporating an electron-optical system according to the present invention.
  • the cathode 101 emits an electron beam passing through the main converging lens 116 which may, as stated above, be axially symmetrical, cylindrical or toric, whereafter the beam is deflected by a set of plates only one of which is shown at 114.
  • the beam then passes through a lens 113 which is shown as being composed of two successive slotted field stops, after which the beam passes between two deflecting plates 111 and 111' to reach the screen 106.
  • the helical coating on the inside of the tube is shown at 117.
  • An electron-optical system for a cathode ray tube having a cathode for emitting a beam and a screen comprising: first deflection means nearest the cathode; second deflection means nearest the screen, said first and second deflection means being arranged one behind the other symmetrically about the axis of the beam and respectively deflecting the beam transversely of the axis in mutually perpendicular planes; after accelerating means arranged between said second deflection means and the screen for providing a field having a gradient along the beam axis substantially only in the deflection plane of said second deflection means; and lens means arranged between said first and second deflection means for producing an intermediate image only in said de flection plane of said second deflection means and substantially intermediate said lens means and said screen, said after accelerating means converging the beam to cross said beam axis and to reproduce said image on said screen.

Landscapes

  • Transforming Electric Information Into Light Information (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US724147A 1957-03-27 1958-03-26 Electron-optical system and method Expired - Lifetime US2954499A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET13423A DE1098627B (de) 1957-03-27 1957-03-27 Elektronenoptische Elektrodenanordnung fuer Kathodenstrahlroehren

Publications (1)

Publication Number Publication Date
US2954499A true US2954499A (en) 1960-09-27

Family

ID=7547331

Family Applications (1)

Application Number Title Priority Date Filing Date
US724147A Expired - Lifetime US2954499A (en) 1957-03-27 1958-03-26 Electron-optical system and method

Country Status (6)

Country Link
US (1) US2954499A (enrdf_load_stackoverflow)
CH (1) CH360442A (enrdf_load_stackoverflow)
DE (1) DE1098627B (enrdf_load_stackoverflow)
FR (1) FR1191289A (enrdf_load_stackoverflow)
GB (1) GB884300A (enrdf_load_stackoverflow)
NL (1) NL226053A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449624A (en) * 1965-09-25 1969-06-10 Emi Ltd Focusing and deflecting system for a cathode ray tube
US3496406A (en) * 1965-09-03 1970-02-17 Csf Cathode ray tubes with electron beam deflection amplification
US3936693A (en) * 1972-10-02 1976-02-03 General Electric Company Two-aperture immersion lens
US4044282A (en) * 1974-10-17 1977-08-23 Balandin Genrikh D Cathode-ray tube with variable energy of beam electrons
US4142133A (en) * 1976-10-20 1979-02-27 Balandin Genrikh D Cathode-ray tube with variable energy of beam electrons
US5339003A (en) * 1992-06-22 1994-08-16 Principia Optics, Inc. Laser screen for a cathode-ray tube

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB473675A (en) * 1935-04-19 1937-10-18 Vladislas Zeitline Improvements in or relating to cathode ray tubes
US2114572A (en) * 1936-06-01 1938-04-19 Radio Inventions Inc Cathode ray ture system
US2212640A (en) * 1934-07-07 1940-08-27 Radio Inventions Inc Cathode ray system
GB553466A (en) * 1940-03-13 1943-05-24 Philips Nv Improvements in or relating to cathode-ray tubes
US2572858A (en) * 1947-06-03 1951-10-30 Sylvania Electric Prod Electron optical system
US2861209A (en) * 1953-12-14 1958-11-18 Hazeltine Research Inc Cathode-ray-tube beam-deflection system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2111231A (en) * 1934-06-27 1938-03-15 Radio Patents Corp Recording device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212640A (en) * 1934-07-07 1940-08-27 Radio Inventions Inc Cathode ray system
GB473675A (en) * 1935-04-19 1937-10-18 Vladislas Zeitline Improvements in or relating to cathode ray tubes
US2114572A (en) * 1936-06-01 1938-04-19 Radio Inventions Inc Cathode ray ture system
GB553466A (en) * 1940-03-13 1943-05-24 Philips Nv Improvements in or relating to cathode-ray tubes
US2572858A (en) * 1947-06-03 1951-10-30 Sylvania Electric Prod Electron optical system
US2861209A (en) * 1953-12-14 1958-11-18 Hazeltine Research Inc Cathode-ray-tube beam-deflection system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3496406A (en) * 1965-09-03 1970-02-17 Csf Cathode ray tubes with electron beam deflection amplification
US3449624A (en) * 1965-09-25 1969-06-10 Emi Ltd Focusing and deflecting system for a cathode ray tube
US3936693A (en) * 1972-10-02 1976-02-03 General Electric Company Two-aperture immersion lens
US4044282A (en) * 1974-10-17 1977-08-23 Balandin Genrikh D Cathode-ray tube with variable energy of beam electrons
US4142133A (en) * 1976-10-20 1979-02-27 Balandin Genrikh D Cathode-ray tube with variable energy of beam electrons
US5339003A (en) * 1992-06-22 1994-08-16 Principia Optics, Inc. Laser screen for a cathode-ray tube

Also Published As

Publication number Publication date
GB884300A (en) 1961-12-13
NL226053A (enrdf_load_stackoverflow)
CH360442A (de) 1962-02-28
FR1191289A (fr) 1959-10-19
DE1098627B (de) 1961-02-02

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