US2217409A - Cathode ray control apparatus - Google Patents

Cathode ray control apparatus Download PDF

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Publication number
US2217409A
US2217409A US175369A US17536937A US2217409A US 2217409 A US2217409 A US 2217409A US 175369 A US175369 A US 175369A US 17536937 A US17536937 A US 17536937A US 2217409 A US2217409 A US 2217409A
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US
United States
Prior art keywords
coils
sheath
windings
cathode ray
control apparatus
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
US175369A
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English (en)
Inventor
Hepp Gerard
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.)
RCA Corp
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RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
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Publication of US2217409A publication Critical patent/US2217409A/en
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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
    • H01J29/70—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

Definitions

  • This invention relates to a deflection coil system for cathode ray tubes in which one or more deflection windings are surrounded by a sheath of conductive material.
  • Such a sheath may form part of the magnetic circuit in which case it is made from magnetic material and surrounds the whole of the coil system formed by one or more windings or it may constitute an electrostatic screen between the 19 windings of a coil system formed by at least two windings in which case it avoids undesirable couplings between the windings.
  • a disadvantage concomitant to such a sheath is that eddy currents occur in the sheath and bring about a substantial loss of energy.
  • the sheath which surrounds one or more deflection coils shouldbe built up from a wire wound 20 to surround this winding or these windings.
  • FIG. 1 is a cross sectional view of one form of construction of a deflection coil system according to the invention
  • Fig. 2 is a perspective view of a magnetic sheath surrounding the deflection coil system shown in Fig. 1.
  • the deflection coil system shown in. Fig. 1 comprises a vertical deflection coil which, when used a television system, is intended to deflect the 1 cathode ray beam in a direction perpendicular to the scanning lines and is formed by two diametrically opposed deflection coils i and 2.
  • Each l, 2 comprises a number of concentrically wound windings or groups of windings and each group of windings comprises preferably a number of windings.
  • a horizontal deflection coil which is constituted by coils H and i2 and which, when used in a television system, may serve to cause the deflecib' tin of the cathode ray beam in a direction pa: iiel to the scanning lines.
  • the coil system shown in Fig. 1 contains two coaxially arranged cylinders 3 and 4 made of inlating material, for example fibre.
  • the Vertideflection coils I and 2 are supported by the din" the horizontal deflection coils I! E21 by the cylinder 3.
  • the cylinder 3 or 4 ectively is provided with two right-angled or G respectively which have the function of maintaining the coils H and 12 or I and 2 respectively at the correct relative spacing.
  • the whole of the coil system is surrounded by a sheath 1 from magnetic material which closes the lines of force and is co-axial with the cylin- 5 ders 3 and 4.
  • the sheath l is made from a wire Wound to surround the coil system, as is shown in Fig. 2, which is a perspective View of the sheath '1.
  • the wire is preferably wound to surround the cylinder 8 of insulating material which 10 surrounds the coils l and 2 and is co-axial with the cylinders 3 and 4.
  • the cylinder 8 serves not only to support the wire winding but also to avoid a short-circuit of the windings of the coils I and 2.
  • the sheath 1 is constituted by an insulated winding of magnetic material.
  • the construction shown in Fig. 1 comprises in addition an electrostatic screen 9 arranged between the vertical and the horizontal deflecting coils, said screen avoiding any undesired coupling between the two windings.
  • this screen is made from a wire wound to surround the coils II and I2 of the horizontal deflection winding and made from conductive non-magnetic material.
  • the losses occurring in the screen 9 are consequently reduced to a minimum.
  • the section of the wires by means of which the screen 9 and .the sheath 1 are wound may have any shape desired.
  • the inner deflection coil may also have arranged on its inside an electrostatic screen made from wire of conductive non-magnetic material.
  • an electrostatic screen made from wire of conductive non-magnetic material.
  • Such a screen has the function of avoiding electrostatic influence on the electron beam controlled by the coil system, if the tube inside which the electron beam is produced is not provided with a screening layer.
  • the ends of the above-described cylindrical coil system are preferably closed by plates of insulating material, for example fibre, which have also secured to them the connecting termi- 4'3 nals for the two deflection windings.
  • plates of insulating material for example fibre
  • These plates are, however, not shown in the drawing since they are not necessary for correct understanding of the invention, which consists in the construction of the sheath 1 and the screen 9.
  • a coil system for deflecting electronic beams comprising at least a pair of separate coils, an electrostatic sheath interposed between said coils comprising a wire of non-magnetic material Wound so as to electrostatically separate said coils, and a magnetic sheath surrounding said coils comprising a wire of magnetic material continuously Wound to embrace substantially all of the external magnetic field of said coils.
  • Apparatus for deflecting an electron beam in two co-ordinates comprising elctromagnetic means for deflecting the beam in one co-ordinate, a substantially cylindrical form for supporting said electromagnetic means, a second electromagnetic means for deflecting the beam in a direction at right angles to the direction in which it is deflected by said first electromagnetic means, a substantially cylindrical form for supporting said second electromagnetic means, said forms being coaxial, an electrostatic sheath comprising a wire of non-magnetic material wound and positioned between one of said electromagnetic deflecting means and the other of said electromagnetic deflecting means and immediately adjacent one of said supporting forms, and an electromagnetic shield substantially embracing the external magnetic field of said coils comprising a wire of magnetic material wound externally to all of said electromagnetic deflecting means.

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  • Details Of Television Scanning (AREA)
US175369A 1937-04-26 1937-11-19 Cathode ray control apparatus Expired - Lifetime US2217409A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2217409X 1937-04-26

Publications (1)

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US2217409A true US2217409A (en) 1940-10-08

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US175369A Expired - Lifetime US2217409A (en) 1937-04-26 1937-11-19 Cathode ray control apparatus

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US (1) US2217409A (de)
BE (1) BE427739A (de)
FR (1) FR837105A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428947A (en) * 1945-01-31 1947-10-14 Rca Corp Deflection device for cathode-ray tubes
US2463720A (en) * 1947-02-19 1949-03-08 Rca Corp Electron beam influencing apparatus
US2562395A (en) * 1949-02-23 1951-07-31 Motorola Inc Anastigmatic deflection yoke
US2763805A (en) * 1954-06-29 1956-09-18 Rca Corp Electromagnetic focus coil for cathode ray tube
US3824515A (en) * 1970-02-18 1974-07-16 B Holman Screening cage
US4145678A (en) * 1977-05-09 1979-03-20 Hitachi, Ltd. Pickup tube structure with an improved magnetic shield
US4251728A (en) * 1979-07-30 1981-02-17 International Business Machines Corporation Compensated magnetic deflection coil for electron beam lithography system
US4290038A (en) * 1978-08-18 1981-09-15 Tokyo Shibaura Denki Kabushiki Kaisha Scanning-area rotation device for an image pickup tube
US4392083A (en) * 1981-11-20 1983-07-05 Teletype Corporation Radiation shield for a cathode ray tube
US4806894A (en) * 1986-12-09 1989-02-21 Mitsubishi Denki Kabushiki Kaisha Apparatus for cancelling leakage magnetic field
US5032764A (en) * 1988-03-29 1991-07-16 General Electric Cgr Sa Coil, a method of construction of said coil and an imaging device equipped with a coil of this type

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE895916C (de) * 1940-07-06 1953-11-09 Fernseh Gmbh Magnetisches Ablenksystem fuer Bildfaengerroehren mit Vorabbildung

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428947A (en) * 1945-01-31 1947-10-14 Rca Corp Deflection device for cathode-ray tubes
US2463720A (en) * 1947-02-19 1949-03-08 Rca Corp Electron beam influencing apparatus
US2490731A (en) * 1947-02-19 1949-12-06 Rca Corp Electron beam control apparatus
US2562395A (en) * 1949-02-23 1951-07-31 Motorola Inc Anastigmatic deflection yoke
US2763805A (en) * 1954-06-29 1956-09-18 Rca Corp Electromagnetic focus coil for cathode ray tube
US3824515A (en) * 1970-02-18 1974-07-16 B Holman Screening cage
US4145678A (en) * 1977-05-09 1979-03-20 Hitachi, Ltd. Pickup tube structure with an improved magnetic shield
US4290038A (en) * 1978-08-18 1981-09-15 Tokyo Shibaura Denki Kabushiki Kaisha Scanning-area rotation device for an image pickup tube
US4251728A (en) * 1979-07-30 1981-02-17 International Business Machines Corporation Compensated magnetic deflection coil for electron beam lithography system
US4392083A (en) * 1981-11-20 1983-07-05 Teletype Corporation Radiation shield for a cathode ray tube
US4806894A (en) * 1986-12-09 1989-02-21 Mitsubishi Denki Kabushiki Kaisha Apparatus for cancelling leakage magnetic field
US5032764A (en) * 1988-03-29 1991-07-16 General Electric Cgr Sa Coil, a method of construction of said coil and an imaging device equipped with a coil of this type

Also Published As

Publication number Publication date
FR837105A (fr) 1939-02-02
BE427739A (de)

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