US2888588A - Electron gun structure - Google Patents

Electron gun structure Download PDF

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Publication number
US2888588A
US2888588A US346674A US34667453A US2888588A US 2888588 A US2888588 A US 2888588A US 346674 A US346674 A US 346674A US 34667453 A US34667453 A US 34667453A US 2888588 A US2888588 A US 2888588A
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US
United States
Prior art keywords
grid
aperture
cathode
electrode
central portion
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
US346674A
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English (en)
Inventor
Dichter Channing
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 Electric Co
Original Assignee
General Electric Co
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
Priority to US2732511D priority Critical patent/US2732511A/en
Priority to BE527842D priority patent/BE527842A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US346674A priority patent/US2888588A/en
Priority to FR1098838D priority patent/FR1098838A/fr
Priority to GB9945/54A priority patent/GB747755A/en
Priority to GB9946/54A priority patent/GB747756A/en
Application granted granted Critical
Publication of US2888588A publication Critical patent/US2888588A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • 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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns

Definitions

  • 'Ihe-present'invention relatesto an improved electron gun structure :suitable for'use .in cathode ray tubes and particularly to an improved control grid structure for such tubes.
  • Cathode ray tubes for'use 'in television receivers are manufactured in large quantities.
  • thegrid-to-cathode and control grid-to-acceleratinggrid spacings are rather close with the result that vmany tubes are rejected because of variations from the desired spacings which in many cases result in a .short circuit between adjacent electrodes.
  • the wall thickness of the grid cylinder'of the grid may'be decreased but :in constructions provided in the'past this has not been practicable.
  • 'the'wall defining the grid aperture is of reduced thickness inth'e region immediately surrounding the aperture and is .structurally reinforced so that it remains stable as to position.
  • the 'surface' thereof is also shaped to improved the shape of the electrostatic field between it and the cathode so as to improve the quality of the spot particularly as the voltage of the control grid approaches zero, that is, is made less negative to increase the intensity of the beam.
  • the body of the grid cap is of the usual thickness to provide sufiicient rigidity for support and to Withstand the heating to which it is subjected during processing of the tube.
  • Fig. l is an elevational view of an electron gun structure embodying my invention.
  • Fig. 2 is an enlarged view in section of a portion of the gun structure of Fig. 1;
  • Fig. 3 is a sectional view taken along the line 33 of Fig. 2;
  • Fig. 4 is an enlarged sectional view of a grid embodying a modification of my invention.
  • the various electrodes which are to be insulated from one another aresupported by means of glass stalks 5 in which areembedded anumber ofstuds 6. These studs are spot welded to the various electrodes.
  • the entire assembly is supported from the stem or header 8 bymeans of conductors connected with the lead-in conductors .9.
  • the focusing structure 4 may to advantage bed the type described and claimed in my U.S..PatentNo. 2,732,- 511, issued January 24, 195.6, and assigned to the assignee of this application.
  • the grid cathode assembly lincludes a grid cup '10 having a grid aperture :11 in the center .of the closed end thereof.
  • Thespacing of the cathode assembly with respect toth'e end wall of the grid cup 10 as'well as supportfor :the end of the grid cup is provided by a flangedgspacer collar or'ring member 17, having one end engaging the end wall of the grid cup and the other end resting on ithe upper 'surface'of the cathode supporting disk 13.
  • the corrugation or rib 18 is annular and extends inwardly into'the ,grid cup 10 in the end wall or grid wall including the grid aperture 11. Additionally, “the corrugation -is of slightly larger diameter than the collar '17.
  • The'shape of'the outer-surface of the control member is such as to give a desired "electrostatic fieldin the gridcathode region and in the region'between the control grid and accelerating grid 2.
  • the surface of the control grid which faces the accelerating grid 2 is that of a portion of a sphere of very large diameter as compared with the diameter of the electrodes involved.
  • the central portion of the end Wall of the grid cup in which the aperture 11 is located and which defines the boundary of the spherical surface or depression corresponds generally in area to the active area of the cathode.
  • control grid 10' may be provided with a portion 19 surrounding the aperture 11 of reduced thickness connected with the body of the grid by a straight tapered portion 20. While this slope is not quite as desirable as that shown in Fig. 2 from the standpoint of the fields produced, it is satisfactory and easier to manufacture.
  • a control grid structure for a beam type electric discharge device comprising a diaphragm of sheet metal having a central portion with an aperture therein, the thickness of said diaphragm gradually increasing from the boundary of said aperture only to the boundary of said central portion, and an annular reinforcing rib surrounding said aperture intermediate said boundary of said central portion and the boundary of said diaphragm.
  • An electrode structure for a beam type electric discharge device comprising a cathode including an active surface, a control grid diaphragm of sheet metal supported adjacent said cathode, said diaphragm including a central portion corresponding generally in area to said active surface of said cathode and having an aperture therein, the thickness of said diaphragm being less than .005" at the boundary of said aperture and gradually increasing from said boundary of said aperture only to the boundary of said central portion, thereby to provide a depression about said aperture on the side of said diaphragm opposite said cathode, and a planar apertured accelerating electrode supported in closely spaced relation on the side of said diaphragm opposite said cathode.
  • An electrode structure for a beam type electric discharge device comprising a control grid diaphragm having an aperture therein, a cathode including an active surface, said cathode being supported on one side of said diaphragm, a planar apertured accelerating electrode supported on the opposite side of said diaphragm in closely spaced parallel relation to said diaphragm, the surface of said diaphragm on said opposite side of said diaphragm being substantially planar except for a central portion corresponding in area generally to said active surface of said cathode and surrounding said aperture, the side of said central portion facing said accelerating electrode gradually diverging with respect to the adjacent surface of said accelerating electrode to establish a desired electrostatic field pattern and provide a thinner wall at said aperture than the remainder of said diaphragm.
  • a control grid for a beam type electric discharge device comprising a cup-shaped sheet metal member having an end wall with an aperture therein and a substantially planar outer surface, a central portion surrounding said aperture the thickness of said central portion gradually decreasing from the boundary of said central portion on said outer surface of said wall toward the boundary of said aperture, and an annular reinforcing n'b struck in from the sheet metal end wall and surrounding said central portion.
  • a control grid structure comprising a sheet metal cup having a centrally located aperture in the end wall thereof, the wall surrounding the aperture being of reduced thickness as compared with the remaining wall of said cup, a transverse insulating member supported within said cup, a cathode sleeve supported from said insulating member with the end thereof positioned behind said aperture, a collar surrounding said cathode and interposed between said insulating member and said disk, an inwardly extending ridge on the end Wall of said cup surrounding said collar to reinforce said end wall and position said collar.
  • Anelectrode structure for a beam type electric discharge device comprising an apertured first electrode and an apertured second electrode including opposed substantially planar surfaces supported in closely spaced parallel relation, said second electrode including a central portion gradually decreasing in thickness from the surface of said second electrode adjacent said first electrode to the boundary of the aperture therein, and an annular reinforcing rib spaced in from the edge and surrounding said central portion of said second electrode, said rib extending away from said first electrode.
  • An electrode structure for a beam type electric discharge device comprising an apertured first electrode and an apertured second electrode including opposed substantially planar surfaces supported in closely spaced parallel relation, a central portion of said second electrode surrounding the aperture therein and facing said first electrode being dished thereby to establish a desired electrm static field pattern and to reduce the thickness of said second electrode only in the region immediately surrounding said aperture therein, and an annular rib provided in said second electrode outwardly of said central portion and extending away from said first electrode.

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  • Electron Sources, Ion Sources (AREA)
  • Particle Accelerators (AREA)
US346674A 1953-04-03 1953-04-03 Electron gun structure Expired - Lifetime US2888588A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US2732511D US2732511A (en) 1953-04-03 Dichter
BE527842D BE527842A (enrdf_load_stackoverflow) 1953-04-03
US346674A US2888588A (en) 1953-04-03 1953-04-03 Electron gun structure
FR1098838D FR1098838A (fr) 1953-04-03 1954-04-02 Perfectionnements aux tubes à rayons cathodiques
GB9945/54A GB747755A (en) 1953-04-03 1954-04-05 Improvements in electrode structures for beam discharge devices
GB9946/54A GB747756A (en) 1953-04-03 1954-04-05 Improvements in electrostatic lenses and electron guns therewith

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US346674A US2888588A (en) 1953-04-03 1953-04-03 Electron gun structure

Publications (1)

Publication Number Publication Date
US2888588A true US2888588A (en) 1959-05-26

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Application Number Title Priority Date Filing Date
US2732511D Expired - Lifetime US2732511A (en) 1953-04-03 Dichter
US346674A Expired - Lifetime US2888588A (en) 1953-04-03 1953-04-03 Electron gun structure

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Application Number Title Priority Date Filing Date
US2732511D Expired - Lifetime US2732511A (en) 1953-04-03 Dichter

Country Status (4)

Country Link
US (2) US2888588A (enrdf_load_stackoverflow)
BE (1) BE527842A (enrdf_load_stackoverflow)
FR (1) FR1098838A (enrdf_load_stackoverflow)
GB (2) GB747755A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971108A (en) * 1958-09-26 1961-02-07 Sylvania Electric Prod Electron discharge device
US3005123A (en) * 1959-07-16 1961-10-17 Griffiths Electronics Inc Electron gun construction
US3008064A (en) * 1957-10-28 1961-11-07 Rauland Corp Cathode-ray tube
US3128407A (en) * 1960-11-14 1964-04-07 Rca Corp Cathode-grid assembly for electron guns
US3254251A (en) * 1962-07-06 1966-05-31 Rca Corp Cathode ray tube gun having nested electrode assembly
US3255374A (en) * 1961-05-17 1966-06-07 Sylvania Electric Prod Electron discharge device with apertured grid electrode of spherical shape
JPS5021074B1 (enrdf_load_stackoverflow) * 1973-01-10 1975-07-19
US4049990A (en) * 1976-10-08 1977-09-20 Gte Sylvania Incorporated CRT in-line gun electrode having strengthening ribs
US4049991A (en) * 1976-10-08 1977-09-20 Gte Sylvania Incorporated Longitudinal rib embossment in tri-apertured, substantially planar electrode
US4319160A (en) * 1979-11-15 1982-03-09 North American Philips Consumer Electronics Corp. One piece astigmatic grid for color picture tube electron gun and method of making same
US4595858A (en) * 1984-12-03 1986-06-17 Rca Corporation Reinforcing means for a cup-shaped electron gun electrode
US4645469A (en) * 1980-08-04 1987-02-24 North American Philips Consumer Electronics Corp. Beam shaping CRT electrode and method of fabricating same
US4952840A (en) * 1989-03-20 1990-08-28 Rca Licensing Corp. Strengthening means for a sidewall of a cup-shaped member for an electron gun assembly of a CRT

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903612A (en) * 1954-09-16 1959-09-08 Rca Corp Positive ion trap gun
US2982878A (en) * 1954-11-23 1961-05-02 Rca Corp Electrode support
US2810851A (en) * 1955-07-01 1957-10-22 Johnson And Hoffman Mfg Corp Electrodes for electron gun units
US2939980A (en) * 1956-01-30 1960-06-07 Sylvania Electric Prod Image reproduction device structure
US2853639A (en) * 1956-02-27 1958-09-23 Westinghouse Electric Corp Cathode ray tube
US2840739A (en) * 1956-10-12 1958-06-24 Thomas Electronics Inc Cathode ray tube gun assembly
US2913612A (en) * 1956-10-29 1959-11-17 Gen Electric Cathode ray tube
US3205391A (en) * 1957-11-18 1965-09-07 Multi Tron Lab Inc Negative-lens type deflection magnifying means for electron beam in cathode ray tubes
US2935635A (en) * 1957-11-18 1960-05-03 Philco Corp Cathode ray tube display system
US2922072A (en) * 1957-12-05 1960-01-19 Sylvania Electric Prod Image reproduction device
US2942128A (en) * 1958-05-28 1960-06-21 Johnson And Hoffman Mfg Corp Electrodes for electron gun unit
US3027479A (en) * 1958-06-27 1962-03-27 Rca Corp Electron guns
US3020434A (en) * 1958-12-08 1962-02-06 Philco Corp Self shielding electron gun and cathode ray tube system including same
US3080500A (en) * 1959-06-22 1963-03-05 Philco Corp Cathode ray system
US3017531A (en) * 1959-12-16 1962-01-16 Gen Electric Electron gun electrode supports
US3200469A (en) * 1960-01-28 1965-08-17 Rca Corp Spherical grids and methods of making same
US3036238A (en) * 1960-04-29 1962-05-22 Sylvania Electric Prod High resolution c.r. tube
NL162243C (nl) * 1970-09-04 1980-04-15 Philips Nv Televisiecamerabuis.
US3870002A (en) * 1970-09-04 1975-03-11 Philips Corp Television camera tube with three electrode focusing lens
US3887830A (en) * 1973-09-07 1975-06-03 Raytheon Co Cathode ray tube with magnetic beam alignment means
US4604548A (en) * 1980-05-29 1986-08-05 Rca Corporation Electron gun with afterglow eliminator
US4370592A (en) * 1980-10-29 1983-01-25 Rca Corporation Color picture tube having an improved inline electron gun with an expanded focus lens

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2135941A (en) * 1935-04-09 1938-11-08 Rca Corp Electrode structure
US2173498A (en) * 1935-11-16 1939-09-19 Loewe Opta Gmbh Hot cathode arrangement for a cathode ray tube
GB521803A (en) * 1937-11-24 1940-05-31 Fernseh Ag Improvements in or relating to cathode ray tubes
US2391780A (en) * 1943-10-13 1945-12-25 Rca Corp Electron discharge device
US2436265A (en) * 1945-07-27 1948-02-17 Du Mont Allen B Lab Inc Cathode-ray tube
US2443916A (en) * 1947-06-27 1948-06-22 Rca Corp Cathode-grid assembly for cathode-ray tubes
US2540621A (en) * 1948-02-19 1951-02-06 Rca Corp Electron gun structure
US2581446A (en) * 1949-10-31 1952-01-08 Cons Eng Corp Supporting means for vacuum electrodes
US2582454A (en) * 1950-05-13 1952-01-15 Du Mont Allen B Lab Inc Cathode grid assembly
US2644906A (en) * 1951-08-11 1953-07-07 Gen Electric Electron beam discharge device
US2666162A (en) * 1949-10-21 1954-01-12 Commw Scient Ind Res Org Electronic counting device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB458746A (en) * 1935-03-19 1936-12-21 John Edgar Keyston Improvements in and relating to cathode ray tubes
US2217168A (en) * 1938-02-19 1940-10-08 Bell Telephone Labor Inc Electron discharge device
US2627047A (en) * 1951-07-03 1953-01-27 Rauland Corp Cathode-ray tube electrode
US2638559A (en) * 1952-01-19 1953-05-12 Nat Video Corp Electrostatic lens for cathode-ray tubes

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2135941A (en) * 1935-04-09 1938-11-08 Rca Corp Electrode structure
US2173498A (en) * 1935-11-16 1939-09-19 Loewe Opta Gmbh Hot cathode arrangement for a cathode ray tube
GB521803A (en) * 1937-11-24 1940-05-31 Fernseh Ag Improvements in or relating to cathode ray tubes
US2391780A (en) * 1943-10-13 1945-12-25 Rca Corp Electron discharge device
US2436265A (en) * 1945-07-27 1948-02-17 Du Mont Allen B Lab Inc Cathode-ray tube
US2443916A (en) * 1947-06-27 1948-06-22 Rca Corp Cathode-grid assembly for cathode-ray tubes
US2540621A (en) * 1948-02-19 1951-02-06 Rca Corp Electron gun structure
US2666162A (en) * 1949-10-21 1954-01-12 Commw Scient Ind Res Org Electronic counting device
US2581446A (en) * 1949-10-31 1952-01-08 Cons Eng Corp Supporting means for vacuum electrodes
US2582454A (en) * 1950-05-13 1952-01-15 Du Mont Allen B Lab Inc Cathode grid assembly
US2644906A (en) * 1951-08-11 1953-07-07 Gen Electric Electron beam discharge device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008064A (en) * 1957-10-28 1961-11-07 Rauland Corp Cathode-ray tube
US2971108A (en) * 1958-09-26 1961-02-07 Sylvania Electric Prod Electron discharge device
US3005123A (en) * 1959-07-16 1961-10-17 Griffiths Electronics Inc Electron gun construction
US3128407A (en) * 1960-11-14 1964-04-07 Rca Corp Cathode-grid assembly for electron guns
US3255374A (en) * 1961-05-17 1966-06-07 Sylvania Electric Prod Electron discharge device with apertured grid electrode of spherical shape
US3254251A (en) * 1962-07-06 1966-05-31 Rca Corp Cathode ray tube gun having nested electrode assembly
JPS5021074B1 (enrdf_load_stackoverflow) * 1973-01-10 1975-07-19
US4049990A (en) * 1976-10-08 1977-09-20 Gte Sylvania Incorporated CRT in-line gun electrode having strengthening ribs
US4049991A (en) * 1976-10-08 1977-09-20 Gte Sylvania Incorporated Longitudinal rib embossment in tri-apertured, substantially planar electrode
DE2745183A1 (de) * 1976-10-08 1978-04-13 Gte Sylvania Inc Elektrodenausbildung der elektronenkanonen einer inline-farbbildroehre
US4319160A (en) * 1979-11-15 1982-03-09 North American Philips Consumer Electronics Corp. One piece astigmatic grid for color picture tube electron gun and method of making same
US4645469A (en) * 1980-08-04 1987-02-24 North American Philips Consumer Electronics Corp. Beam shaping CRT electrode and method of fabricating same
US4595858A (en) * 1984-12-03 1986-06-17 Rca Corporation Reinforcing means for a cup-shaped electron gun electrode
US4952840A (en) * 1989-03-20 1990-08-28 Rca Licensing Corp. Strengthening means for a sidewall of a cup-shaped member for an electron gun assembly of a CRT

Also Published As

Publication number Publication date
GB747756A (en) 1956-04-11
US2732511A (en) 1956-01-24
GB747755A (en) 1956-04-11
FR1098838A (fr) 1955-08-22
BE527842A (enrdf_load_stackoverflow)

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