US2100618A - Cathode ray apparatus - Google Patents

Cathode ray apparatus Download PDF

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Publication number
US2100618A
US2100618A US757436A US75743634A US2100618A US 2100618 A US2100618 A US 2100618A US 757436 A US757436 A US 757436A US 75743634 A US75743634 A US 75743634A US 2100618 A US2100618 A US 2100618A
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US
United States
Prior art keywords
cathode ray
coil
coils
winding
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
US757436A
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English (en)
Inventor
Urtel Rudolf
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 US2100618A publication Critical patent/US2100618A/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

Definitions

  • This invention relates particularly to means to insure coordinate deflection of the cathode ray beam developed within a cathode ray tube.
  • the invention is concerned with the magnetic deflection of cathode ray pencils in oscillograph and similar tubes, especially when the tubes are used for television work.
  • the means for deflection of the ray is adapted to produce magnetic deflection for the shifting of the spot in the direction of the picture lines.
  • an arrangement is presupposed which has constant scanning speed along picture lines, such as a perforated or Nipkow disk or a mirror wheel scanner, or where desired a cathode ray transmitter system such as Zworykin has described in many publications.
  • Fig, 1 is a graphical representation of a sawtooth current
  • Fig. 2 is a graphical representation of a distorted saw-tooth current
  • Fig. 3 shows one of the known forms of making deflecting coils
  • Fig. 4 shows one embodiment of my invention for winding deflection coils
  • Fig. 5 shows a modification of an embodiment of my invention.
  • Fig. 6 shows another modification of my invention.
  • Fig. 1 shows the ideal form of the current in which the return interval t should be as brief as possible in contrast with the line duration T. During period T the rise of the current should occur linearly in order that the movement of the receiving spot may remain congruent relative to the sending spot both as regards time and space.
  • the deformation of the grating may be diminished by reducing the coil inductance, for instance, by reducing the number of turns of the coil. If incidentally no loss of sensitiveness of the deflecting means is to happen, the coil must be placed at greater proximity to the cathode ray pencil. However, a final limitation is imposed upon such approach of the coil to the cathode ray pencil by the diameter of the neck of the tube unless, as has been suggested in the prior art, the coil is to be accommodated inside the tube.
  • S is a coil continuously wound or composed. of suitably assembled parts and tightly surrounding the neck of the tube in a way as shown for causing deflection in one coordinate direction.
  • the turns of the coil, as shown, should preferably be given a form oblong in axial direction of the tube, say, rectangular form in order that the electrons of the cathode ray pencil may be acted upon over a longer distance of their travel and path.
  • Deflection in the other coordinate sense is accomplishable by an ordinary pair of coils disposed at right angles to the direction of the field of the first coil and outside the latter. It is preferable in this connection to insure the coordinate deflection involving the greater period by the aid of the outer coils inasmuch as these, as a general rule, will involve the higher inductance.
  • S2 and S3 represent the pair of coils
  • R is the neck of the tube which is directly surrounded by the coil SI.
  • the assembly is short-circuited magnetically by an iron yoke J.
  • the outer coil may here be given a greater number of coils.
  • the efiectiveness of such a coil system may considerably increased also by the aid of an iron yoke.
  • a disposition of this kind when compared with the deflector system shown in Fig. 3 secures a reduction of inductance to ca at the same sensitiveness and greatest freedom from distortion.
  • the form of the winding shown in Fig. 6 substantially eliminates any magnetic field set up by the coils parallel to the axis of the tube, because the field set up by one of the semi-circular portions of a turn is neutralized by the field set up by the other semi-circular portionof another turn lying in the same plane as the first turn.
  • the fields set up perpendicular to the plane containing the two semicircular portions are of opposite sign and since a symmetrical array is provided, both of the fields are of equal magnitude. Having equal magnitude by opposite signs, they, therefore, neutralize each other.
  • the direction of the magnetic fields produced can be verified by the well known right-hand rule which is well known in the art of magnetics.
  • a cathode ray tube comprising an envelope, said envelope having a'cylindrical neck portion through which a developed electron beam passes, means for magnetically defiecting said electron beam, said means comprising a winding disposed upon said neck and adapted to produce the magnetic field at right angles to said electron beam, and said winding shaped so that every plane perpendicular to said produced magnetic field which passes through said cylindrical neck also passes through a portion of the winding serving to produce the magnetic field.
  • a cathode ray tube comprising an envelope, said envelope having a cylindrical neck portion through which a developed electron beam passes, means for magnetically deflecting said electron beam, said means comprising a winding disposed upon said neck and adapted to produce the magnetic field at 7 right angles to said electron beam, said winding tron beam passes, means for magnetically defiecting said electron beam, said deflecting means comprising a winding disposed about said neck so as to produce within the tube neck a magnetic field at right angles to said electron beam, said winding being so shaped that every plane perpendicular to said produced magnetic field which passes through said cylindrical neck also passes through a portion of the winding serving to pro cute the magnetic field, a second set of deflecting coils mounted at right angles to said first set of coils, and a magnetic core surrounding said deflecting coils to prevent leakage reaction between said coils.
  • a cathode ray tube comprising an envelope, said envelope having a cylindrical neck portion through which a developed electron beam passes, means for magnetically deflecting said electron beam, said means comprising a winding having one of its peripheries in a plane perpendicular to the axis of the tube and certain portions of the said Winding being in magnetic opposition to certain other portions of said Winding for neutralizing the magnetic fields set up in said portions during operation of said tube.

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  • Details Of Television Scanning (AREA)
US757436A 1933-12-07 1934-12-14 Cathode ray apparatus Expired - Lifetime US2100618A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET0043335 1933-12-07

Publications (1)

Publication Number Publication Date
US2100618A true US2100618A (en) 1937-11-30

Family

ID=7561473

Family Applications (1)

Application Number Title Priority Date Filing Date
US757436A Expired - Lifetime US2100618A (en) 1933-12-07 1934-12-14 Cathode ray apparatus

Country Status (5)

Country Link
US (1) US2100618A (en, 2012)
BE (1) BE406679A (en, 2012)
FR (1) FR782219A (en, 2012)
GB (1) GB433996A (en, 2012)
NL (1) NL39451C (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722621A (en) * 1949-10-04 1955-11-01 Hartford Nat Bank & Trust Co Device for deflecting the cathode-ray in cathode-ray tubes
US4538127A (en) * 1977-10-31 1985-08-27 Texas Instruments Incorporated Magnetic quadripole

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE739047C (de) * 1935-09-30 1943-09-09 Fernseh Gmbh Ablenkspulensystem fuer Elektronenstrahlroehren
USB385358I5 (en, 2012) * 1935-10-31
GB482195A (en) * 1936-09-21 1938-03-21 Alan Dower Blumlein Improvements in or relating to electromagnetic deflecting coils for cathode ray tubes
GB483650A (en) * 1936-10-20 1938-04-20 Alan Dower Blumlein Improvements in or relating to electromagnetic deflecting coils for cathode ray tubes
GB494586A (en) * 1937-04-27 1938-10-27 Baird Television Ltd Improvements in or relating to deflecting means for use with electron discharge devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722621A (en) * 1949-10-04 1955-11-01 Hartford Nat Bank & Trust Co Device for deflecting the cathode-ray in cathode-ray tubes
US4538127A (en) * 1977-10-31 1985-08-27 Texas Instruments Incorporated Magnetic quadripole

Also Published As

Publication number Publication date
NL39451C (en, 2012)
GB433996A (en) 1935-08-23
BE406679A (en, 2012)
FR782219A (fr) 1935-05-31

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