US2264567A - Deflecting device - Google Patents

Deflecting device Download PDF

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Publication number
US2264567A
US2264567A US305697A US30569739A US2264567A US 2264567 A US2264567 A US 2264567A US 305697 A US305697 A US 305697A US 30569739 A US30569739 A US 30569739A US 2264567 A US2264567 A US 2264567A
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US
United States
Prior art keywords
deflecting
yoke
coil
cathode ray
coils
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
US305697A
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English (en)
Inventor
Gunther Johannes
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh GmbH
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 Fernseh GmbH filed Critical Fernseh GmbH
Application granted granted Critical
Publication of US2264567A publication Critical patent/US2264567A/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D5/00—Burners in which liquid fuel evaporates in the combustion space, with or without chemical conversion of evaporated fuel

Definitions

  • This invention relates to magnetic deflecting devices for cathode ray tubes particularly for television purposes and it is especially concerned with suitable arrangements and constructions of the coils situated upon an iron yoke.
  • a further object is to provide a deflecting system which can be used in connection with a cathode ray tube of short length having a wide angle of deflection of the cathode ray in the order of 25 to 35 between the undeflected ray and the maximally deflected ray.
  • the stray field of a coil situated upon the yoke is made use of to compensate the geometrical distortions.
  • one or more energizing coils are arranged in such proximity to the space through which the cathode ray passes that the stray field of the coils assists in deflecting the cathode ray.
  • extensions on the arms of the yoke it can be preferable to use extensions on the arms of the yoke to produce a compensating field on the side opposite the coil. If I such extensions would be arranged on the side towards the coil they would short circuit a considerable part of the magnetic field. It is therefore a particular advantage to produce the compensation by the stray field of the energizing coil itself.
  • the coils on both sides of the yoke are arranged so closely to the cathode ray tube that the deflected ray passes on both sides through the stray field of these coils. It is preferable to wind the coils in such a manner that the windings are unevenly distributed over the length of the coil and a desired distribution of the lines of force is produced.
  • the arrangement has the advantage not only that a linear deflection is made possible over the entire scanned area but also that the deflecting device is made smaller and more compact because the arms of the yoke become considerably shorter.
  • the elflciency of the whole device is increased because the part of the field which does not partake in the deflecting efiect is made very small.
  • Fig. 3 a closed deflecting yoke with two coils while Fig. 4 shows a perspective view of a deflecting yoke having pole pieces.
  • Fig. 1 shows the cross section of a cathode ray tube lying between the arms 2 of a ferromagnetic yoke energized by coil 3.
  • the arms 2 of the yoke may be provided with pole pieces 4, but these pole pieces are not always essential.
  • the ends of the arms carry extensions 5 consisting of soft iron pieces which may be bent in any desired form.
  • the arms of the yoke are made so short that the stray field of coil 3 indicated by dotted lines extends within the tube so that the cathode ray passes through this stray field when it is maximally deflected.
  • the coil in such a manner that the stray lines of force extend into the deflecting space particularly at that point where the greatest distortion would be produced if the stray field were not present.
  • This effect can be increased by giving to the coils a particular cross section as for instance represented in Fig. 2 by coil 6.
  • This coil has a larger diameter in its central portion than at the sides thereof so that the stray field is concentrated in the central part where the maximal distortion occurs.
  • the coil 6 may however be so formed that the cross section in the central portion is smaller than at the edges if for instance a barrel shaped distortion shall be compensated.
  • the stray field may be suitably formed so that it has only an eflect at such places of the deflecting space where its influence is desired.
  • the effect of the stray field is further increased by the fact that the stray field does not only exist in a plane at right angles to the cathode ray but also in planes including a smaller angle with the cathode ray.
  • FIG. 3 Another embodiment of the invention is shown in Fig. 3.
  • the tube l is situated between pole shoes 8 forming a part of arms 1 of a closed yoke.
  • This yoke carries the energizing coils 6 while coils 9 are arranged on the poles for deflecting the cathode ray in a direction vertically to that produced by the coils 6.
  • the stray field of coils 6 enters the cathode ray tube from both sides so that distortions on both sides of the scanned area are compensated.
  • Fig. 4 shows a view of a deflecting system similar to that of Fig. 2.
  • the extensions 5 may be arranged in the plane of the yoke or as represented in Fig. 4 behind the yoke in the direction of thecathode ray.
  • the effect of these extensions 5 is similar to that of the additional coil 6 of Fig. 3.
  • the arrangement has the advantage that besides a correction of the shape of the scanned area an increase in deflection is obtained.
  • the extensions 5 are preferably so arranged that the end pieces lying opposite to one another are essentially normal to the plane of the screen and parallel to the upper limit of the scanned area. V
  • the deflecting device of the invention is pare ticularly suited for television transmission and receiving tubes. It is however not limited to the use in these particular types of tubes and can be used in all places where a cathode ray shall be defiected in two directions so that a particular geometric form of scanning patterns is produced.
  • a cathode ray deflecting device including an iron yoke having a central portion and two arms between which the main deflecting field exists, a cathode ray tube between said two arms, and an energizing coil, carried by said yoke, said coil having a central portion and two side portions of smaller diameter than the central portion and being so arranged that the cathode ray in its defiected position passes through the stray field of the central portion of said coil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Details Of Television Scanning (AREA)
US305697A 1938-11-24 1939-11-22 Deflecting device Expired - Lifetime US2264567A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEF4503D DE972332C (de) 1938-11-24 1938-11-24 Elektromagnetische Ablenkeinrichtung fuer Kathodenstrahlroehren, insbesondere fuer Fernsehgeraete
DEF85994D DE741901C (de) 1938-11-24 1938-12-01 Anordnung zur Ablenkung von Kathodenstrahlen
DE2297407X 1939-03-10

Publications (1)

Publication Number Publication Date
US2264567A true US2264567A (en) 1941-12-02

Family

ID=42830646

Family Applications (3)

Application Number Title Priority Date Filing Date
US305697A Expired - Lifetime US2264567A (en) 1938-11-24 1939-11-22 Deflecting device
US305698A Expired - Lifetime US2255039A (en) 1938-11-24 1939-11-22 Cathode ray deflecting device
US321629A Expired - Lifetime US2297407A (en) 1938-11-24 1940-03-01 Magnetic deflecting systems for cathode-ray tubes

Family Applications After (2)

Application Number Title Priority Date Filing Date
US305698A Expired - Lifetime US2255039A (en) 1938-11-24 1939-11-22 Cathode ray deflecting device
US321629A Expired - Lifetime US2297407A (en) 1938-11-24 1940-03-01 Magnetic deflecting systems for cathode-ray tubes

Country Status (4)

Country Link
US (3) US2264567A (fi)
BE (1) BE437088A (fi)
DE (2) DE972332C (fi)
FR (1) FR872306A (fi)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455977A (en) * 1946-12-31 1948-12-14 Philco Corp Magnetic lens for correcting scanning defects
US2459732A (en) * 1946-03-26 1949-01-18 Philco Corp Electrical system
US2460609A (en) * 1946-01-24 1949-02-01 Rca Corp Beam aligning apparatus
US2467009A (en) * 1945-07-28 1949-04-12 Emi Ltd Circuit arrangement embodying cathode-ray tubes
US2805351A (en) * 1952-09-10 1957-09-03 Philips Corp Magnet system for producing a magnetic field

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636999A (en) * 1953-04-28 x x x x i
US2425125A (en) * 1940-07-20 1947-08-05 Hartford Nat Bank & Trust Co Cathode-ray tube with magnetic compensating means
DE976695C (de) * 1943-09-08 1964-03-05 Philips Nv Ablenkspulenanordnung fuer Kathodenstrahlroehren
US2586463A (en) * 1950-07-07 1952-02-19 Rca Corp Electron beam deflection system
US2793311A (en) * 1951-04-18 1957-05-21 Du Mont Allen B Lab Inc Deflection yoke
DE975306C (de) * 1952-06-29 1961-11-02 Telefunken Patent Elektronenstrahlroehre mit einem Auffangschirm und einem elektrostatischen Ablenksystem
NL131432C (fi) * 1960-02-11

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1955320A (en) * 1929-11-16 1934-04-17 Westinghouse Electric & Mfg Co Television synchronization method
DE620173C (de) * 1932-10-29 1935-10-15 Rca Corp Einrichtung zum Ausgleich von Bildverzerrungen bei Fernsehkathodenstrahlroehren
GB462684A (en) * 1935-09-12 1937-03-12 Alfred Henry Gilbert Improvements in or relating to television and like apparatus
GB471103A (en) * 1935-11-27 1937-08-27 Michael Bowman Manifold Improvements in and relating to deflecting means for cathode ray tubes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467009A (en) * 1945-07-28 1949-04-12 Emi Ltd Circuit arrangement embodying cathode-ray tubes
US2460609A (en) * 1946-01-24 1949-02-01 Rca Corp Beam aligning apparatus
US2459732A (en) * 1946-03-26 1949-01-18 Philco Corp Electrical system
US2455977A (en) * 1946-12-31 1948-12-14 Philco Corp Magnetic lens for correcting scanning defects
US2805351A (en) * 1952-09-10 1957-09-03 Philips Corp Magnet system for producing a magnetic field

Also Published As

Publication number Publication date
US2255039A (en) 1941-09-09
FR872306A (fr) 1942-06-08
BE437088A (fi) 1939-12-30
US2297407A (en) 1942-09-29
DE972332C (de) 1959-07-02
DE741901C (de) 1943-11-18

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