US2617059A - Cathode-ray tube - Google Patents

Cathode-ray tube Download PDF

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Publication number
US2617059A
US2617059A US199697A US19969750A US2617059A US 2617059 A US2617059 A US 2617059A US 199697 A US199697 A US 199697A US 19969750 A US19969750 A US 19969750A US 2617059 A US2617059 A US 2617059A
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US
United States
Prior art keywords
tube
coil
electron beam
cathode
angle
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
US199697A
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English (en)
Inventor
Neeteson Pieter Adrianus
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust 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
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2617059A publication Critical patent/US2617059A/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
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H01J29/762—Deflecting by magnetic fields only using saddle coils or printed windings

Definitions

  • This invention relates to a magnetic deflection system for a cathode-ray tube.
  • rasher distortion is proportional to a the astigmatism to 41 17 and the coma tolab where a represents the angle of deflection of the electron beam and b the diameter or the opening angle of the beam. In accordance with the nature of the tube and the value of the desired angle of deflection of the electron beam, one or more of these errors will be more manifest.
  • the object of the present invention is to provide a deflection system which is free or substantially free from distortion and astigmatism.
  • the deflection system comprises two arcuate coils symmetrically disposed to each other with respect to a plane passing through a longitudinal axis of the oathode-ray tube and surrounding the said axis.
  • the ends of the coils nearest the screen of the tube are separated by an angle which is greater than 120 while the ends of the coils furthest removed from the screen are separated by an angle which is less than 120.
  • Fig. 1 shows diagrammatically a cathode-ray tube comprising a deflection system according to one embodiment of the invention
  • Fig. 2 shows a view of one coil half as shown in Fig. 1 developed on a plane and;
  • Fig. 3 shows a second embodiment of the coil 2. system which has been developed into'a plane.
  • the cathode-ray tube 1 shown diagrammatically in Fig. 1 comprises a cylindrical portion- 2 and a luminescent screen 3. andmay, forexampl'e, be used in a television reproducing device-of the type projecting the image-ontothe screen 3 in an enlarged manner by means of a projection device.
  • the cylindrical part 2 of the tube is surrounded by a deflection system consisting of two coil halves 4 and 5.
  • the two coil halves have the same shape, are arranged diametrically opposite to each other, are curved about the cylindrical wall of the tube or a cylindrical former surrounding it and may consist of one or more turns.
  • the ends 6 and 1 of conductors 8 and 9 extending substantially in a longitudinal direction along the tube embrace an angle 01 of more than viewed from the axis of the tube.
  • the ends H] and H remotest from the screen 3 enclose an angle 02 smaller than 120.
  • Fig. 2 shows, partly in broken lines, the coil half as shown in Fig. 1, developed into a plane.
  • This trapezoidal shape is usually to be preferred to the shape of the coil shown in Fig. 3, since the shape of the latter is more diilicult to reduce to practice.
  • Fig. 3 shows one coil of a coil system developed into a plane, in which raster distortion and astigmatism are eliminated.
  • the conductors extending in a longitudinal direction of the tube consist of two parts l2, l3 and I 2', l3 respectively.
  • these parts extend substantially parallel to the axis of the tube, but the parts [2, l3 and 12', I3 are displaced in a tangential direction with respect to each other.
  • These offset parts are interconnected through parts [4, and [4' respectively extending substantially at right angles to the axis of the tube.
  • the parts l5 and [6 of the coil half are smaller and larger respectively than /3 of the circumference of the cylindrical wall surrounded by them.
  • the cylindrical part of the tube may be surrounded by two deflection systems of the aforesaid nature.
  • a magnetic deflecting system for a cathoderay tube having means directing an electron beam along a longitudinal axis and having an electron beam receiving means at one end thereof comprising two arcuate deflecting coils surrounding the axis, each coil being symmetrical to the other with respect to a plane through said axis, and each coil having a, first end portion closer to said electron beam receiving means and a second end portion remoter from said electron beam receiving means, said first end portions each encompassing an are having an angle of more than 120 and said second end portions each encompassing an are having an angle of less than 120.
  • a magnetic deflecting system for a cathoderay tube having means directing an electron beam along a longitudinal axis and having an electron beam receiving means at one end thereof comprising two arcuate deflecting coils each having a substantially trapezoidal shape when developed into a plane surrounding the axis, each coil being symmetrical to the other with respect to a plane through said axis, and each coil having a first end portion closer to said electron beam end end portions each encompassing an arc having an angle of less than 120.
  • a magnetic deflecting system for a cathoderay tube having means directing an electron beam along a longitudinal axis and having an electron beam receiving means at one end thereof comprising two arcuate deflecting coils surrounding the axis, each coil being symmetrical to the other with respect to a plane through said axis, each coil having a conductor extending substantially parallel to said longitudinal axis, said conductor comprising two portions which are displaced tangentially from one another and are interconnected through a conductor extending substantially perpendicular to the said axis, and each coil having a first end portion closer to said electron beam receiving means and a second end portion remoter from said electron beam receiving means, said first end portions encompassing an are having an angle of more than 120 and said second end portions encompassing an are having an angle of less than 120.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US199697A 1949-12-02 1950-11-17 Cathode-ray tube Expired - Lifetime US2617059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL672624X 1949-12-02

Publications (1)

Publication Number Publication Date
US2617059A true US2617059A (en) 1952-11-04

Family

ID=19802183

Family Applications (1)

Application Number Title Priority Date Filing Date
US199697A Expired - Lifetime US2617059A (en) 1949-12-02 1950-11-17 Cathode-ray tube

Country Status (4)

Country Link
US (1) US2617059A (fr)
DE (1) DE857420C (fr)
FR (1) FR1028655A (fr)
GB (1) GB672624A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2793311A (en) * 1951-04-18 1957-05-21 Du Mont Allen B Lab Inc Deflection yoke
US2850678A (en) * 1955-05-03 1958-09-02 Motorola Inc Color television receiver
US2866125A (en) * 1954-02-09 1958-12-23 Philips Corp Cathode-ray tube
US3115544A (en) * 1956-04-25 1963-12-24 Hazeltine Research Inc Color-television receivers and deflection yokes
US3849749A (en) * 1972-02-16 1974-11-19 Matsushita Electric Ind Co Ltd Deflection coils producing pincushion and barrel deflection fields
US4039987A (en) * 1976-01-16 1977-08-02 U.S. Philips Corporation Color television display device
US4096462A (en) * 1976-04-09 1978-06-20 Hitachi, Ltd. Deflection yoke device for use in color television receiver sets
US4518898A (en) * 1983-02-22 1985-05-21 Image Graphics, Incorporated Method and apparatus for correcting image distortions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE537872A (fr) * 1954-05-05

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455171A (en) * 1943-09-08 1948-11-30 Hartford Nat Bank & Trust Co System for magnetic deflection in cathode-ray tubes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455171A (en) * 1943-09-08 1948-11-30 Hartford Nat Bank & Trust Co System for magnetic deflection in cathode-ray tubes

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2793311A (en) * 1951-04-18 1957-05-21 Du Mont Allen B Lab Inc Deflection yoke
US2866125A (en) * 1954-02-09 1958-12-23 Philips Corp Cathode-ray tube
US2850678A (en) * 1955-05-03 1958-09-02 Motorola Inc Color television receiver
US3115544A (en) * 1956-04-25 1963-12-24 Hazeltine Research Inc Color-television receivers and deflection yokes
US3849749A (en) * 1972-02-16 1974-11-19 Matsushita Electric Ind Co Ltd Deflection coils producing pincushion and barrel deflection fields
US4039987A (en) * 1976-01-16 1977-08-02 U.S. Philips Corporation Color television display device
US4096462A (en) * 1976-04-09 1978-06-20 Hitachi, Ltd. Deflection yoke device for use in color television receiver sets
US4518898A (en) * 1983-02-22 1985-05-21 Image Graphics, Incorporated Method and apparatus for correcting image distortions

Also Published As

Publication number Publication date
FR1028655A (fr) 1953-05-27
GB672624A (en) 1952-05-21
DE857420C (de) 1952-11-27

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