US2986668A - Cathode ray tube optical system - Google Patents

Cathode ray tube optical system Download PDF

Info

Publication number
US2986668A
US2986668A US704577A US70457757A US2986668A US 2986668 A US2986668 A US 2986668A US 704577 A US704577 A US 704577A US 70457757 A US70457757 A US 70457757A US 2986668 A US2986668 A US 2986668A
Authority
US
United States
Prior art keywords
screen
lens
cathode ray
electron
ray 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
US704577A
Inventor
Dan J Haflinger
Charles R Corpew
Howard A Gutzmer
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.)
General Dynamics Corp
Original Assignee
General Dynamics 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 General Dynamics Corp filed Critical General Dynamics Corp
Priority to US704577A priority Critical patent/US2986668A/en
Application granted granted Critical
Publication of US2986668A publication Critical patent/US2986668A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement

Definitions

  • the present invention relates to a cathode ray tube optical system and more particularly, to a cathode ray tube optical system which utilizes electron optical components in a cathode ray tube in a manner giving a high resolution and uniform shaped spot over the entire face of a cathode ray tube screen.
  • the number of electrons comprising the cross sectional area of the beam at any point in its path become fewer as the distance from the center of the beam increases. This follows from the fact that the like charges of the electrons create repelling forces which tend to scatter the electrons in the beam.
  • the spot will always have a tendency to become less definite on its outer edges. This fuzziness at the edge of the spot,
  • Patented May 30, 1961 due to the fewer number of electrons around the edge of the beam creates a condition that is compounded by the distortion generally incurred in deflection of the beam to a particular spot on the screen.
  • the deflecting of the beam adds distortion to the beams image on the screen, because of the non-uniformity of electrostatic or electromagnetic deflecting fields and further because the beam, after being partially deflected by the forward part of the deflecting field, then must cross the lines of force of the latter part of the deflecting field at an angle that varies from
  • the electron beam is normally deflected at a point when it has considerable cross sectional area inasmuch as the beam only reaches its smallest cross sectional area at its point of contact with the screen of a cathode ray tube. This deflection of the beam at a point when it has considerable cross sectional area emphasizes the distortion effect of the deflection means, makes the circular spot out of roun as well as causing greater dispersion of the individual
  • the present invention utilizes an electron gun capable of genera-ting a beam having its individual electron paths directed along the longitudinal axis of the tube.
  • a beam shaping aperture in the form of a true circle, cuts out the center section of the beam, thereby pasing only the concentrated center element of electrons onto the screen.
  • the electrons are traveling in parallel paths so that a subsequent electronic lens sees them as coming from infinity and crosses them over at a distance equal to the focal length of the lens.
  • the electronic lens is capable of focusing the received circular electron beam onto the cathode ray tube screen substantially free from distortion, as in a manner well known in the electronic lens art.
  • the beams cross section is at a minimum.
  • the center of the deflection system is located so that the deflection of the beam is accomplished where the beams cross sectional area is at a minimum. This permits the beam to be deflected at a point where distortion resulting therefrom will be minimized.
  • the dual purpose of the lens is to image the beam shaping member on the screen of the tube and to cross over the beam at the center of the deflection system.
  • Curved deflection plates are used, which creates a field between the plates whose lines of potential are curved. This permits the deflecting beam to penetrate the potential lines between the plates at substantially a right angle, regardless of the degree of deflection incurred when passing between the plates. Further, in the curved plates, the field between the plates is the most intense at its narrowest spacing becoming less intense as the plates diverge. Therefore, the beam passes between the plates with its smallest cross section contacting that portion of the field which is the strongest, and when its cross sectional area has increased, contacts that part where the field is less intense. The beam thus receives its greatest deflection at the point where it has the smallest cross sec-, tional area. Accordingly, the use of the curved plates as disclosed herein, reduces considerably, distortion resulting from deflection of the beam.
  • An object of the present invention is the provision of a cathode ray tube optical system capable of providing a spot on a cathode ray tube screen having an improved resolution.
  • Another object of the invention is to provide a spot on the screen of a cathode ray tube having uniformity in size over the entire face of the screen.
  • Still another object of the invention is to deflect the beam at its point of smallest cross section.
  • a further object of the invention is to provide for substantially distortion-free deflection of an electron beam.
  • FIG. 1 is a perspective representation in accordance with the principles of the invention
  • Figure 2 is a sectional view of a cathode ray tube illustrating the arrangement of the electro-optical system
  • Figure 3 is a perspective view illustrating the manner in which the circular bundle of shaped electron streams are produced from the electron beam by the beam shaping member;
  • Figure 4 illustrates schematically, the effect the curved lines of potential between the curved plates has on an electron beam passing therebetween.
  • the cathode ray tube is shown as at 9 and mounted therein is an electron source 11, a control grid 12, an accelerating electrode 13 and an anode 14 all of which comprise a beam generating means.
  • a beam of electrons is admitted from the source 11 and directed through the control grid 12 enroute to the target or screen 10.
  • Control grid 12 is spaced from source 11 and may be in the form of a cylinder having an aperture therein through which the electron beam may pass, as is well known to those skilled in the art.
  • the anode 1'4 focuses the beam so that the individual paths of the electrons are parallel with the longitudinal axis of the tube.
  • the parallel electron beam, as focused by lens 14 and as shown as 18, is intercepted by shaping member 15.
  • Shaping member 15 has a circular aperture therein. The axis of the aperture being on the longitudinal axis of the tube. Shaping member 15 functions to pass only the center portion of the electron beam. Thus, only a dense circular portion of the center of the electron beam is passed in a parallel path to the electron convergence lens 16.
  • Figure 3 illustrates pictorially how the shaping plate 15 cuts out the center portion of the electron beam 18.
  • Plate 15 is capable of stopping all portions of the beam other than that striking its aperture 20, passing there through only the shaped beam 19.
  • FIG. 4 the curved plates 27 and 28 are illustrated in schematic form.
  • Potential distribu tion lines 21 passing between the plates represent the electrostatic field. As shown, the field is more intense at point e, the narrowest space between the curved plates, and becomes less dense at the widest point of divergence 1.
  • Lines 19 represent the path of the electron beam through the curved plates and its angle of deflection. It is readily apparent from an inspection of Figure 4 that as electron beam passes between the plates, regardless of its deflection, it will always contact the lines of potential between the plates at substantially a right angle. Further, at its point of smallest cross sectional area, it receives its greatest degree of deflection inasmuch as the intensity of the field is greater at its point of entry 6 to the plates. This arrangement considerably reduces 4 the distortion occurring in beam 19 as it passes through the deflection means.
  • the distance a represents the object distance, with distance b representing the focal length and distance 0 representing the image distance.
  • the ratio of a to 0 determines the magnification capable of being exhibited by lens 16 whereas distance b is the focal length of the lens, permitting focusing of the image by lens 16 onto screen 10.
  • the beam generating means generates and projects an electron beam 18 having individual paths parallel to the longitudinal axis of the tube. Electron beam 18 is intercepted by shaping member 15 in its movement towards the cathode ray tube screen. Shaping member 15 cuts out the intensified center portion of beam 18, passing on a shaped circular beam 19. The paths of the individual electrons in shaped beam 19 are still parallel with the longitudinal axis of the tube. Accordingly, electronic lens 16 sees shaped beam 19 as coming from infinity and crosses over the beam, focusing the shaped spot onto the screen.
  • the deflection system is so positioned that it deflects the beam to the desired spot on the screen at the point of cross over of the beam and thus, at its point of smallest cross section.
  • the curved deflection plates create a deflection field capable of reducing the distortion normally incurred in deflecting a beam and thus, permits the spot to be focused on the screen with reduced distortion.
  • a cathode ray tube having a collimated stream of electrons
  • the combination com-prising: a mask having an aperture positioned in the path of said streamwhereby a portion of said collimated electron stream traverses said aperture; an electron lens positioned to be traversed by the portion of said stream that traverses said aperture; means, comprising said lens, for causing the stream of electrons emerging from said aperture to converge in the focal plane of said lens; and a deflection system positioned in said focal plane.
  • a cathode ray tube comprising: means for producing a collimated stream of electrons; an electron optical system; a mask, having an electron stream shaping aperture, positioned in the path of said stream between said collimating means and said electron optical system; means, comprising said electron optical system, for causing the stream of electrons emerging from said aperture to cross over at the focal point of said optical system; a deflection system positioned to straddle said crossover point; and a viewing screen positioned to display the image of said aperture.
  • a cathode ray tube comprising: means for producing an electron beam and directing it along the axis of said tube; means for collimating said electron beam; an electron lens; a mask, having a limiting aperture, positioned in the path of said stream between said collimating means and said lens; means for causing said aperture to become the object of said electron lens; means for causing the electrons emerging from said aperture to traverse said lens-whereby said emergent stream is converged and caused to cross over at the focal point of said lens; a deflection system positioned at said crossover point-whereby said deflection system operates of the smallest cross section of said electron stream; and a viewing screen positioned in the image plane of said lens-whereby the image of said aperture appears on said viewing screen.

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Description

y 30, 1961 D. J. HAFLINGER ETAL 2,986,668
CATHODE RAY TUBE OPTICAL SYSTEM Filed Dec. 25, 1957 CONTROL UN T INVENTORS. CHARLES R. COQPEW W W H A H I m D CATHODE RAY TUBE OPTICAL SYSTEM Dan J. Haflinger, Rancho Santa Fe, and Charles R. Corpew and Howard A. Gutzmer, San Diego, Calif., assignors to General Dynamics Corporation, Rochester, N.Y., a corporation of Delaware Filed Dec. 23, 1957, Ser. No. 704,577
4 Claims. (Cl. 313-85) The present invention relates to a cathode ray tube optical system and more particularly, to a cathode ray tube optical system which utilizes electron optical components in a cathode ray tube in a manner giving a high resolution and uniform shaped spot over the entire face of a cathode ray tube screen.
In the past to obtain a spot on the screen of a cathode ray tube, the general procedure has been to generate a beam, pass it through a convergence lens to reduce its cross sectional area, and hinge this small cross sectional area on the screen of the tube. Somewhere along the path of the beam, the beam is deflected to a desired position on the screen. This prior art method has the disadvantage of being unable to provide a high resolution spot on the screen. The electron beam after leaving the grid of the tube generally passes through two or more cylindrical anode focusing plates which converges the individual paths of the electrons into a narrow beam. However, even though the electron paths are converged into a narrow beam, the number of electrons comprising the cross sectional area of the beam at any point in its path become fewer as the distance from the center of the beam increases. This follows from the fact that the like charges of the electrons create repelling forces which tend to scatter the electrons in the beam.
When the individual electrons leave the grid of the tube they do so in many devirgent paths due to the mutual repulsion of their like charges. Thus, when they reach the convergence lens, it is obviously quite diflicult for the lens to orientate all of the divergent paths of the electrons into the desired convergent path. While the electrons traveling in the center area of the beam can be directed in a composite beam with a good degree of concentration, the electrons which move on the outer edge of the path from their initially leaving the cathode can seldom be concentrated together, because the lens action of the convergent lens only concentrates the beam in a spot at the point of imaging on the screen. Thus, throughout the travel of the outer electrons toward the screen, their path is attempted to be converged into a concentrated w-hole. While this converging action is occurring, the
.repulsive force of like charges is causing the beam to diverge. Thus, this clashing of forces occurs throughout the travel of the electron beam to the screen. Accelerating the electrons to a very high speed, may tend to reduce defocusing of the beam by this scattering action. Nevertheless, the mutual repulsion between the electrons determines the sharpness at which a beam may be focused on the screen.
Thus, in any electron beam directed on the screen in the manner generally known in the art, the spot will always have a tendency to become less definite on its outer edges. This fuzziness at the edge of the spot,
Patented May 30, 1961 due to the fewer number of electrons around the edge of the beam creates a condition that is compounded by the distortion generally incurred in deflection of the beam to a particular spot on the screen. The deflecting of the beam adds distortion to the beams image on the screen, because of the non-uniformity of electrostatic or electromagnetic deflecting fields and further because the beam, after being partially deflected by the forward part of the deflecting field, then must cross the lines of force of the latter part of the deflecting field at an angle that varies from Also, in prior art devices, the electron beam is normally deflected at a point when it has considerable cross sectional area inasmuch as the beam only reaches its smallest cross sectional area at its point of contact with the screen of a cathode ray tube. This deflection of the beam at a point when it has considerable cross sectional area emphasizes the distortion effect of the deflection means, makes the circular spot out of roun as well as causing greater dispersion of the individual electron components of the beam.
The present invention utilizes an electron gun capable of genera-ting a beam having its individual electron paths directed along the longitudinal axis of the tube. A beam shaping aperture in the form of a true circle, cuts out the center section of the beam, thereby pasing only the concentrated center element of electrons onto the screen. As the beam passes through the shaping aperture, the electrons are traveling in parallel paths so that a subsequent electronic lens sees them as coming from infinity and crosses them over at a distance equal to the focal length of the lens. The electronic lens is capable of focusing the received circular electron beam onto the cathode ray tube screen substantially free from distortion, as in a manner well known in the electronic lens art. At the point of cross over of the electron beam traveling to the screen, the beams cross section is at a minimum. At this point the center of the deflection system is located so that the deflection of the beam is accomplished where the beams cross sectional area is at a minimum. This permits the beam to be deflected at a point where distortion resulting therefrom will be minimized. Thus, the dual purpose of the lens is to image the beam shaping member on the screen of the tube and to cross over the beam at the center of the deflection system.
Curved deflection plates are used, which creates a field between the plates whose lines of potential are curved. This permits the deflecting beam to penetrate the potential lines between the plates at substantially a right angle, regardless of the degree of deflection incurred when passing between the plates. Further, in the curved plates, the field between the plates is the most intense at its narrowest spacing becoming less intense as the plates diverge. Therefore, the beam passes between the plates with its smallest cross section contacting that portion of the field which is the strongest, and when its cross sectional area has increased, contacts that part where the field is less intense. The beam thus receives its greatest deflection at the point where it has the smallest cross sec-, tional area. Accordingly, the use of the curved plates as disclosed herein, reduces considerably, distortion resulting from deflection of the beam.
An object of the present invention is the provision of a cathode ray tube optical system capable of providing a spot on a cathode ray tube screen having an improved resolution.
Another object of the invention is to provide a spot on the screen of a cathode ray tube having uniformity in size over the entire face of the screen.
Still another object of the invention is to deflect the beam at its point of smallest cross section.
A further object of the invention is to provide for substantially distortion-free deflection of an electron beam.
Other objects and features of the invention will become apparent to those skilled in the art as the disclosure is made in the following detaileddescription of a preferred embodiment of the invention as illustrated in the accompanying sheet of drawing, in which:
Figure 1 is a perspective representation in accordance with the principles of the invention;
Figure 2 is a sectional view of a cathode ray tube illustrating the arrangement of the electro-optical system;
Figure 3 is a perspective view illustrating the manner in which the circular bundle of shaped electron streams are produced from the electron beam by the beam shaping member;
Figure 4 illustrates schematically, the effect the curved lines of potential between the curved plates has on an electron beam passing therebetween.
Referring to Figures 1 and 2, the cathode ray tube is shown as at 9 and mounted therein is an electron source 11, a control grid 12, an accelerating electrode 13 and an anode 14 all of which comprise a beam generating means. In operation, a beam of electrons is admitted from the source 11 and directed through the control grid 12 enroute to the target or screen 10. Control grid 12 is spaced from source 11 and may be in the form of a cylinder having an aperture therein through which the electron beam may pass, as is well known to those skilled in the art. The anode 1'4 focuses the beam so that the individual paths of the electrons are parallel with the longitudinal axis of the tube. The parallel electron beam, as focused by lens 14 and as shown as 18, is intercepted by shaping member 15. Shaping member 15 has a circular aperture therein. The axis of the aperture being on the longitudinal axis of the tube. Shaping member 15 functions to pass only the center portion of the electron beam. Thus, only a dense circular portion of the center of the electron beam is passed in a parallel path to the electron convergence lens 16.
Figure 3 illustrates pictorially how the shaping plate 15 cuts out the center portion of the electron beam 18. Plate 15 is capable of stopping all portions of the beam other than that striking its aperture 20, passing there through only the shaped beam 19.
At this point, the electrons are traveling in substantially parallel paths, so the lens 16 sees the spot image received as coming from infinity. Electronic lens 16, which may be a convergence lens, crosses over the electron beam at a distance equal to the focal length of the lens. This cross over point 23 (see Figure 2) is the point at which the cross sectional area of the beam is at a minimum. Point 23 is also the established center point of the deflection system 17. Thus, deflection system 17 deflects the beam to the screen at its point of smallest cross section in response to predetermined signals from the control unit.
With reference to Figure 4, the curved plates 27 and 28 are illustrated in schematic form. Potential distribu tion lines 21 passing between the plates represent the electrostatic field. As shown, the field is more intense at point e, the narrowest space between the curved plates, and becomes less dense at the widest point of divergence 1. Lines 19 represent the path of the electron beam through the curved plates and its angle of deflection. It is readily apparent from an inspection of Figure 4 that as electron beam passes between the plates, regardless of its deflection, it will always contact the lines of potential between the plates at substantially a right angle. Further, at its point of smallest cross sectional area, it receives its greatest degree of deflection inasmuch as the intensity of the field is greater at its point of entry 6 to the plates. This arrangement considerably reduces 4 the distortion occurring in beam 19 as it passes through the deflection means.
With reference again to Figure 2, the distance a represents the object distance, with distance b representing the focal length and distance 0 representing the image distance. The ratio of a to 0 determines the magnification capable of being exhibited by lens 16 whereas distance b is the focal length of the lens, permitting focusing of the image by lens 16 onto screen 10.
In summary, the beam generating means generates and projects an electron beam 18 having individual paths parallel to the longitudinal axis of the tube. Electron beam 18 is intercepted by shaping member 15 in its movement towards the cathode ray tube screen. Shaping member 15 cuts out the intensified center portion of beam 18, passing on a shaped circular beam 19. The paths of the individual electrons in shaped beam 19 are still parallel with the longitudinal axis of the tube. Accordingly, electronic lens 16 sees shaped beam 19 as coming from infinity and crosses over the beam, focusing the shaped spot onto the screen. The deflection system is so positioned that it deflects the beam to the desired spot on the screen at the point of cross over of the beam and thus, at its point of smallest cross section. The curved deflection plates create a deflection field capable of reducing the distortion normally incurred in deflecting a beam and thus, permits the spot to be focused on the screen with reduced distortion.
It is to be understood that while the specific embodiment focuses the image of the spot on the screen, it is also possible to have the screen intercept the electron beam at a point varying from, but near the imaging point. While the latter arrangement does not give as clear a spot on the screen as is obtained by focusing, the latter arrangement is still considered to be a part of this invention.
We claim:
1. In a cathode ray tube having a collimated stream of electrons, the combination com-prising: a mask having an aperture positioned in the path of said streamwhereby a portion of said collimated electron stream traverses said aperture; an electron lens positioned to be traversed by the portion of said stream that traverses said aperture; means, comprising said lens, for causing the stream of electrons emerging from said aperture to converge in the focal plane of said lens; and a deflection system positioned in said focal plane.
2. A cathode ray tube comprising: means for producing a collimated stream of electrons; an electron optical system; a mask, having an electron stream shaping aperture, positioned in the path of said stream between said collimating means and said electron optical system; means, comprising said electron optical system, for causing the stream of electrons emerging from said aperture to cross over at the focal point of said optical system; a deflection system positioned to straddle said crossover point; and a viewing screen positioned to display the image of said aperture.
3. A cathode ray tube comprising: means for producing an electron beam and directing it along the axis of said tube; means for collimating said electron beam; an electron lens; a mask, having a limiting aperture, positioned in the path of said stream between said collimating means and said lens; means for causing said aperture to become the object of said electron lens; means for causing the electrons emerging from said aperture to traverse said lens-whereby said emergent stream is converged and caused to cross over at the focal point of said lens; a deflection system positioned at said crossover point-whereby said deflection system operates of the smallest cross section of said electron stream; and a viewing screen positioned in the image plane of said lens-whereby the image of said aperture appears on said viewing screen.
4. The combination of claim 3 wherein said deflecion system comprises deflection plates.
References Cited in the file of this patent UNITED STATES PATENTS 5 Orth Nov. 23, 1937 McGee Oct. 24, 1939 Gray Oct. 28, 1941 Rose Sept. 17, 1946 10 Glyptis Nov. 18, 1947 6 Diemer Mar. 15, 1949 Tolson Oct. 10, 1950 I Roth -2 Dec. 23, 1952 McNaney Sept. 4, 1956 Koda Oct. 30, 1956 Gundert May 13, 1958 Beam May 26, 1959 FOREIGN PATENTS Great Britain Mar. 27, 1957 SEA L) Attest:
ERNEST W. SWIDER DAVID L. LADD Attesting Officer Commissioner of Patents UNITED STATES PATENT OFFICE J OERTIFICATE OF CORRECTION Patent N0 2, 986 668 May 30 1961 Dan Ja vHaflinger et. al.,
It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.
Column 1, line 24, for "hinge" read image Signed and sealed this 26th day of December 1961.
USCOMM-DC- UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N0, 2,986,668 May 30, 1961 Dan J. .Haflinger et a1.
It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent, should read as corrected below.
Column 1, line 24, for "hinge" read image Signed and sealed this 26th day of December 1961.
' (SEA L) Attest:
ERNEST W. SWIDER DAVID L. LADD Attesting Officer Commissioner of Patents USCOMM-DO
US704577A 1957-12-23 1957-12-23 Cathode ray tube optical system Expired - Lifetime US2986668A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US704577A US2986668A (en) 1957-12-23 1957-12-23 Cathode ray tube optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US704577A US2986668A (en) 1957-12-23 1957-12-23 Cathode ray tube optical system

Publications (1)

Publication Number Publication Date
US2986668A true US2986668A (en) 1961-05-30

Family

ID=24830086

Family Applications (1)

Application Number Title Priority Date Filing Date
US704577A Expired - Lifetime US2986668A (en) 1957-12-23 1957-12-23 Cathode ray tube optical system

Country Status (1)

Country Link
US (1) US2986668A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189784A (en) * 1961-07-31 1965-06-15 Litton Prec Products Inc Very high intensity light source using a cathode ray tube
US3223871A (en) * 1961-08-22 1965-12-14 Gen Electric Electron optical system
US3270234A (en) * 1959-07-30 1966-08-30 Telefunken Ag Cathode ray tube having spiral acceleration anode
US3349269A (en) * 1963-11-29 1967-10-24 Stromberg Carlson Corp Astigmatic lens arrangement for cathode ray tubes
US3646335A (en) * 1969-02-11 1972-02-29 Us Army Recorder correlator using scanning recorder devices
US4075533A (en) * 1976-09-07 1978-02-21 Tektronix, Inc. Electron beam forming structure utilizing an ion trap
US10529537B1 (en) * 2018-02-12 2020-01-07 Facebook Technologies, Llc Electron flood lithography

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2099749A (en) * 1933-05-30 1937-11-23 Rca Corp Electron tube
US2176974A (en) * 1934-03-19 1939-10-24 Emi Ltd Cathode ray tube
US2260313A (en) * 1939-02-08 1941-10-28 Bell Telephone Labor Inc Cathode ray tube
US2407905A (en) * 1942-04-11 1946-09-17 Rca Corp Television transmitting apparatus and method of operation
US2431113A (en) * 1946-07-23 1947-11-18 Rauland Corp Ion filter
US2464562A (en) * 1945-10-06 1949-03-15 Hartford Nat Bank & Trust Co Discharge tube
US2525737A (en) * 1948-04-14 1950-10-10 Rca Corp Plate support
US2623190A (en) * 1950-02-13 1952-12-23 Solo S Roth Color television system
US2761988A (en) * 1954-03-08 1956-09-04 Gen Dynamics Corp Cathode ray apparatus
US2769116A (en) * 1954-12-02 1956-10-30 Hughes Aircraft Co Deflection system for cathode-ray type storage tubes
GB771066A (en) * 1953-07-10 1957-03-27 Visseaux S A J Improvements in or relating to deflection means for cathode ray tubes
US2834902A (en) * 1953-07-18 1958-05-13 Telefunken Gmbh Deflection system for cathode ray tubes
US2888606A (en) * 1956-08-27 1959-05-26 Rca Corp Modulation control for cathode ray tubes

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2099749A (en) * 1933-05-30 1937-11-23 Rca Corp Electron tube
US2176974A (en) * 1934-03-19 1939-10-24 Emi Ltd Cathode ray tube
US2260313A (en) * 1939-02-08 1941-10-28 Bell Telephone Labor Inc Cathode ray tube
US2407905A (en) * 1942-04-11 1946-09-17 Rca Corp Television transmitting apparatus and method of operation
US2464562A (en) * 1945-10-06 1949-03-15 Hartford Nat Bank & Trust Co Discharge tube
US2431113A (en) * 1946-07-23 1947-11-18 Rauland Corp Ion filter
US2525737A (en) * 1948-04-14 1950-10-10 Rca Corp Plate support
US2623190A (en) * 1950-02-13 1952-12-23 Solo S Roth Color television system
GB771066A (en) * 1953-07-10 1957-03-27 Visseaux S A J Improvements in or relating to deflection means for cathode ray tubes
US2834902A (en) * 1953-07-18 1958-05-13 Telefunken Gmbh Deflection system for cathode ray tubes
US2761988A (en) * 1954-03-08 1956-09-04 Gen Dynamics Corp Cathode ray apparatus
US2769116A (en) * 1954-12-02 1956-10-30 Hughes Aircraft Co Deflection system for cathode-ray type storage tubes
US2888606A (en) * 1956-08-27 1959-05-26 Rca Corp Modulation control for cathode ray tubes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270234A (en) * 1959-07-30 1966-08-30 Telefunken Ag Cathode ray tube having spiral acceleration anode
US3189784A (en) * 1961-07-31 1965-06-15 Litton Prec Products Inc Very high intensity light source using a cathode ray tube
US3223871A (en) * 1961-08-22 1965-12-14 Gen Electric Electron optical system
US3349269A (en) * 1963-11-29 1967-10-24 Stromberg Carlson Corp Astigmatic lens arrangement for cathode ray tubes
US3646335A (en) * 1969-02-11 1972-02-29 Us Army Recorder correlator using scanning recorder devices
US4075533A (en) * 1976-09-07 1978-02-21 Tektronix, Inc. Electron beam forming structure utilizing an ion trap
US10529537B1 (en) * 2018-02-12 2020-01-07 Facebook Technologies, Llc Electron flood lithography

Similar Documents

Publication Publication Date Title
US2777958A (en) Magnetic electron lens
USRE25091E (en) Cathode-ray tubes of the lenticular grill variety
US2274586A (en) Cathode ray tube
US3417199A (en) Cathode ray device
US2986668A (en) Cathode ray tube optical system
US3023336A (en) Cathode ray tube having post acceleration
US3331985A (en) Character generating system utilizing a cathode ray tube in which a portion of a plurality of electron beams are selectively defocussed to form the character
US2223908A (en) Cathode ray tube
US2598919A (en) Barrier grid storage tube
US2909688A (en) Magnetic means for deflecting electron beams
US3900760A (en) Electron beam tube having post deflection lens
US3896331A (en) Electron optical system
US3042832A (en) High-sensitivity cathode-ray tube
US2921212A (en) Gun system comprising an ion trap
GB1226886A (en)
US3619686A (en) Color cathode-ray tube with in-line plural electron sources and central section of common grid protruding toward central source
US3883771A (en) Collinear electron gun system including accelerating grid having greater effective thickness for off axis beams
US4205254A (en) Electron gun for a cathode ray tube
US3873878A (en) Electron gun with auxilliary anode nearer to grid than to normal anode
US3217200A (en) Internal magnetic lens for electron beams
US2172728A (en) Electron discharge device
US3678329A (en) Cathode ray tube
GB1278235A (en) Cathode ray tube
US2890379A (en) Distortion correction in cathode-ray tubes
US2835837A (en) Electron gun for producing an electron beam