EP1190432B1 - Deflection device for cathode ray tube - Google Patents

Deflection device for cathode ray tube Download PDF

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Publication number
EP1190432B1
EP1190432B1 EP00944153A EP00944153A EP1190432B1 EP 1190432 B1 EP1190432 B1 EP 1190432B1 EP 00944153 A EP00944153 A EP 00944153A EP 00944153 A EP00944153 A EP 00944153A EP 1190432 B1 EP1190432 B1 EP 1190432B1
Authority
EP
European Patent Office
Prior art keywords
separator
tube
rear part
exhibits
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
EP00944153A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1190432A1 (en
Inventor
Pascal Fourrier
Christian Carette
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.)
Thomson Tubes and Displays SA
Original Assignee
Thomson Tubes and Displays SA
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 Thomson Tubes and Displays SA filed Critical Thomson Tubes and Displays SA
Publication of EP1190432A1 publication Critical patent/EP1190432A1/en
Application granted granted Critical
Publication of EP1190432B1 publication Critical patent/EP1190432B1/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
    • 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
    • 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
    • H01J29/823—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements around the neck of the tube
    • H01J29/826—Deflection arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/70—Electron beam control outside the vessel
    • H01J2229/703—Electron beam control outside the vessel by magnetic fields
    • H01J2229/7038—Coil separators and formers

Definitions

  • the invention relates to a system for deflecting the electron beams for a cathode ray tube, also referred to as a deflector, and more particularly to the device ensuring both the support of the deflection coils, the mechanical rigidity of the system, the positioning and the fixing of the deflector on the neck of the cathode ray tube.
  • Such a deflection system generally consists of a pair of vertical deflection coils, of a pair of horizontal deflection coils and of a substantially frustoconical ring made of a magnetic material intended to concentrate the flux created by the coils.
  • the two pairs of deflection coils are electrically insulated by a separator, generally made of plastic, which furthermore makes it possible to improve the mechanical rigidity of the deflection device, to fix the coils with respect to one another and to fit the assembly to the neck of the tube.
  • the separator consists of a main body, in one or more parts, substantially funnel-shaped, and of a flexible rear part hugging the neck of the tube and intended for fixing the position of the deflection system along the longitudinal axis of said tube; this fixing is generally effected by virtue of a clamping collar disposed above the flexible rear part.
  • the adjusting of the deflector on the neck of the tube is performed in two steps:
  • the position of the auxiliary coils with respect to the horizontal deflection coils must be adjusted so as to optimize their effect on the electron beams.
  • Patent Application WO 00/79563 discloses a deflection yoke whose separator is oval in section at the location of the front side of the deflection yoke.
  • the auxiliary coils To increase the effect of the auxiliary coils, the latter must be placed as close as possible to the electron beams, this implying, if they are supported by the rear part of the separator, that the cross section of said part be as small as possible.
  • the substantially cylindrical rear part of the separator must possess a transverse cross section of minimum thickness so as to allow the separator to be made in a simple manner by injecting plastic into a mold, too small a thickness not guaranteeing correct filling of the mold during the making of the component.
  • the internal surface of the substantially cylindrical rear part must allow the tilt movements of the front part, thus preventing said internal surface from coming as close as possible to the surface of the tube, and forcing a gap to be left between the internal surface of the separator and the neck of the tube.
  • the deflection systems according to the prior art comprising auxiliary coils disposed over the periphery of the rear part of the separator, whose large thickness leads to the auxiliary coils being driven with very large currents owing to the low sensitivity of said coils, this low sensitivity stemming from the fact that these coils are situated at too great a distance from the beams.
  • the deflector according to the invention incorporates a separator which makes it possible to reduce to the maximum the distance between the auxiliary coils and the beams, while being easy to make and ensuring good mechanical durability.
  • the deflector according to the invention comprises a pair of horizontal deflection coils and a pair of vertical deflection coils, a separator insulating the two pairs from one another and comprising means for supporting said deflector on the surface of the tube, the separator having a flared front part and a rear part in the shape of a substantially cylindrical ring, and extending along a longitudinal axis Z while surrounding the neck of the tube, the device further comprising auxiliary coils disposed over the periphery of the rear part of said separator, wherein the rear part exhibits a zone whose cross section in a plane perpendicular to the Z axis is such that the value of the radius of curvature of the internal periphery exhibits a minimum at at least two points of said internal periphery.
  • Figure 1 represents a system 2 for deflecting the electron beams issuing from an electron gun disposed in a conventional manner at the rear of a cathode ray tube 1.
  • Said system also referred to as a deflector, comprises two pairs of coils 3 intended for the horizontal and vertical deflection of the beams, the two pairs being insulated from one another by a separator 12, generally made of plastic injected into a mold.
  • the separator comprises an annular front part 12, a flared intermediate part 11, and a substantially cylindrical shaped rear part 8 joined to the flared part 10.
  • the deflector after adjusting its position on the neck 6 of the tube, is held in position with the aid of adjustable feet 13 at the front and of a locking ring 9 at the rear.
  • an auxiliary coil 5 for example intended for modulating the horizontal scan rate, is disposed on the neck of the tube behind the deflector 2.
  • This arrangement has several drawbacks, such as for example the lengthening of the neck of the tube so as to allow the installation of the auxiliary coil as well as the awkward manipulation of the deflector once this auxiliary coil has been installed.
  • auxiliary coil 5 is here disposed on the external surface of the rear part of the separator 12 which is substantially cylindrical 8 and of constant thickness 21. This arrangement makes it possible to associate the auxiliary coils and the main deflection coils before installation on the neck of the tube but it impairs the sensitivity of the auxiliary coil 5 owing to its increased distance from the electron beam or beams on which it is intended to act.
  • This distance is increased by the value of the thickness 21 of the rear part 8 of the separator, plus the space 20 which must be provided between the part 8 of the separator and the neck 6 of the tube so as to allow the "tilt" movements of the front 7 of the separator when adjusting the deflector on the neck of the tube.
  • the value of the thickness 21 is chosen in such a way as to allow the rear part 8 of the separator to be made easily by vacuum injection of plastic.
  • Figures 4 and 5 represent a first embodiment of the invention.
  • the final adjustment of the deflector on the neck of the tube requires a tilting movement of the front 7 of the deflector according to just one axis, for example about the horizontal axis X.
  • the rear part 8 of the separator is divided into two zones 30 and 31.
  • the zone 30 is the zone to which the collar 9 will be clamped on the neck of the tube.
  • the zone 31 supports the auxiliary coils 5 and terminates at 10 at the spot where the separator tends to be flared. Since the zone 30 is clamped on the neck of the tube, the tilting movements of the front part of the separator affect only the zone 31 of the rear part 8.
  • the thickness of the part 8 is reduced in favored directions.
  • the directions of the intersections of the separator with the vertical plane YZ allow the tilting movements about the horizontal axis.
  • the thickness 21 along the horizontal axis is smaller than the thickness 22 along the direction of the vertical axis.
  • Illustrated in Figures 4 are the relative positions of the separator and of the neck of the tube, said neck being represented in its extreme positions 23 and 24 in a transverse sectional view at the level of the zone 10 of joining with the flared part 10 of said separator.
  • the point O represents the center of the neck of the tube when the deflection system undergoes no tilting movement of the front part 7
  • the points O' and O" represent the relative positions of the center of the neck of the tube in the separator in the extreme positions of tilting of the front part 7.
  • the value of the offset ⁇ relative to the center of the neck of the tube at the level of the join 10, is calculated by taking into account the maximum allowable angle of tilt and the length of the part 31.
  • the thickness 22 decreases as one proceeds away from the zone 30 supporting the collar, toward the zone 10 of joining to the flared part of the separator.
  • the external surface 26 of the separator in the rear zone remains, in a transverse cross-sectional plane, substantially circular while its internal surface has a variable radius of curvature, with a minimum value, at the level of the two zones of minimum thickness, corresponding to the points of intersection with the YZ plane, and a maximum value, at the level of the two zones of maximum thickness, corresponding to the points of intersection with the XZ plane.
  • the resulting structure of the zone 31 would be identical to that described earlier, the zones of maximum and minimum thickness being simply radially offset by 90° about the longitudinal axis Z.
  • the second embodiment illustrated by Figures 5 results from a further constraint relating to the tilting movements of the front part, which, here, must be performed both about a vertical axis and about a horizontal axis.
  • the extreme positions which may be occupied by the center of the external circular surface 40 of the neck of the tube are displaced according to the points O1 to O8.
  • the neck of the tube comes into contact with the internal surface 25 of the separator.
  • the gaps of value ⁇ representing the relative displacement of the center of the circular surface 40 with respect to the internal surface 25 of the separator along the horizontal and vertical directions, are calculated as before on the basis of the length of the part 31 and of the maximum angle of tilt.
  • the corresponding external surface 26 being circular so as to receive the auxiliary coils, the thickness of the rear part 31 of the separator exhibits in a transverse cross section four zones at the level of the points A, B, C, D of lesser thickness than the thickness of the other four zones at the level of the points E, F, G, H.
  • the diameter of the outside surface 26 is chosen at a minimum so as to satisfy the mechanical strength constraints and plastic injection molding constraints.
  • the minimum thickness to obtain good injection of plastic into the mold leads to the choice of a thickness of around 0.9 mm in the join zone 10.
  • the advantage of the invention is that it makes it possible to choose a smaller outside diameter than in the prior art where the thickness was constant: this is because, within the framework of the invention, choosing a very small thickness about the points A, B, C, D does not compromise the injection of plastic into these zones since the plastic can penetrate laterally through the zones of greater thickness, at E, F, G, H for example.
  • the minimum thickness which can be obtained in the join zone can drop here and there to 0.79 mm, i.e. a thickness reduction of around 12%.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP00944153A 1999-06-18 2000-06-14 Deflection device for cathode ray tube Expired - Lifetime EP1190432B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9907710A FR2795231B1 (fr) 1999-06-18 1999-06-18 Dispositif de deflexion pour tube a rayons cathodiques
FR9907710 1999-06-18
PCT/IB2000/001015 WO2000079563A1 (en) 1999-06-18 2000-06-14 Deflection device for cathode ray tube

Publications (2)

Publication Number Publication Date
EP1190432A1 EP1190432A1 (en) 2002-03-27
EP1190432B1 true EP1190432B1 (en) 2007-05-02

Family

ID=9546954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00944153A Expired - Lifetime EP1190432B1 (en) 1999-06-18 2000-06-14 Deflection device for cathode ray tube

Country Status (12)

Country Link
EP (1) EP1190432B1 (zh)
JP (1) JP2003502821A (zh)
KR (1) KR20020012000A (zh)
CN (1) CN1355928A (zh)
AU (1) AU5838500A (zh)
DE (1) DE60034675T2 (zh)
FR (1) FR2795231B1 (zh)
MX (1) MXPA01013216A (zh)
MY (1) MY128207A (zh)
TR (1) TR200103625T2 (zh)
TW (1) TW464905B (zh)
WO (1) WO2000079563A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100796679B1 (ko) * 2002-04-22 2008-01-21 삼성에스디아이 주식회사 음극선관용 편향요크

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69414698T2 (de) * 1994-07-01 1999-04-08 Thomson Tubes & Displays Elektronenstrahl-Ablenksystem für Kathodenstrahlröhren
ATE157814T1 (de) * 1994-07-01 1997-09-15 Thomson Tubes & Displays Elektronenstrahl-ablenksystem für kathodenstrahlröhren
JP3737191B2 (ja) * 1996-04-26 2006-01-18 株式会社東芝 陰極線管用偏向ヨークおよび陰極線管装置
EP0996960A1 (en) * 1997-07-09 2000-05-03 Koninklijke Philips Electronics N.V. Cathode ray tube having a deflection unit
FR2771216A1 (fr) * 1997-11-18 1999-05-21 Thomson Tubes & Displays Separateur articule pour systeme de deviation de faisceaux electroniques de tube a rayons cathodiques

Also Published As

Publication number Publication date
FR2795231B1 (fr) 2001-08-17
WO2000079563A1 (en) 2000-12-28
AU5838500A (en) 2001-01-09
DE60034675T2 (de) 2008-01-17
TR200103625T2 (tr) 2002-03-21
EP1190432A1 (en) 2002-03-27
CN1355928A (zh) 2002-06-26
JP2003502821A (ja) 2003-01-21
MXPA01013216A (es) 2002-06-21
MY128207A (en) 2007-01-31
KR20020012000A (ko) 2002-02-09
FR2795231A1 (fr) 2000-12-22
TW464905B (en) 2001-11-21
DE60034675D1 (de) 2007-06-14

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