US3913042A - Deflection coil system for colour television - Google Patents

Deflection coil system for colour television Download PDF

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Publication number
US3913042A
US3913042A US432304A US43230474A US3913042A US 3913042 A US3913042 A US 3913042A US 432304 A US432304 A US 432304A US 43230474 A US43230474 A US 43230474A US 3913042 A US3913042 A US 3913042A
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US
United States
Prior art keywords
deflection
coil system
plane
ring core
deflection coil
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
US432304A
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English (en)
Inventor
Tjitte Talsma
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US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3913042A publication Critical patent/US3913042A/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
    • 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
    • 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
    • H01J2229/7031—Cores for field producing elements, e.g. ferrite

Definitions

  • the invention relates to a deflection coil system for a colour television display tube having a partly flared outer surface, the said tube comprising means for generating three electron beams which are situated substantially in one plane, the said deflection coil system comprising a first pair of saddle-like deflection coils which are adapted to the flared shape and which are arranged on both sides of a first deflection plane which, after the mounting of the deflection coilsystem on the display tube, substantially coincides with the plane of the electron beams, a second pair of saddle-like deflection coils which are adapted to the flared shape" and which are arranged on both sides of a second-deflection plane which is perpendicular to the first deflection plane, and a flared ferromagnetic ring core which encloses both coil pairs and which is divided into four quarters by the two deflection planes.
  • Colour television display tubes which are adapted to generate three electron beams which are situated in one plane offer the advantage that the three beams can be converged using simpler means than in the case of display tubes in which the three beams are regularly distributed over the circumference of a circle. There fore, the deflection fields generated by the two deflection coil pairs must satisfy given requirements.
  • the invention has for its object to provide a deflection coil system in which this defect is substantially reduced.
  • the invention is characterized in that the ring core is provided with a recess in each of the four quarters at the area where its diameter is largest.
  • the field of the vertical deflection coils is substantially attenuated at the area where the vertical component of the field strength is the largest, with the result that the raster distortion is substantially reduced.
  • the shape, the size and the location of the four recesses are preferably chosen such that the ring core is symmetrical with respect to the two deflection planes.
  • FIG. 1 is a diagrammatic longitudinal sectional view of a colour television display tube provided with a deflection coil system
  • FIG. 2 is a front view of a display screen of the tube shown in FIG. 1 so as to illustrate the raster distortion
  • FIG. 3 is a diagrammatic view of the vertical deflection field in the foremost part of the deflection coil system shown in FIG. 1,
  • FIG. 4 is a perspective view of a ring core of a deflection coil system according to the invention.
  • FIG. 5 is a front view of the ring core shown in FIG. 4.
  • FIG. 1 is a diagrammatic longitudinal sectional view of a display tube 1 for colour television.
  • This tube consists of a cylindrical neck portion 3 and an adjoining flared portion 5 which is closed on the front side (at the right in FIG. 1) by a display screen 7.
  • Arranged in the neck portion 3 are three electron guns 9 which are situated in a plane perpendicular to the plane of the drawing and which are capable of generating electron beams which are emitted in this plane.
  • a deflection coil system 11 which coaxially encloses the tube and which consists of a first pair ofsaddle-like deflection coils 13 for deflection of the electron beamsin the horizontal direction, a second pair of saddle-like deflection coils 15 for deflection of the electron beams in. the vertical direction, and a ring core 17 which encloses both coil pairs.
  • the shape of the deflection coils l3 and 15 is adapted to the flared shape of the display tube 1.
  • the horizontal deflection coils 13 are situated on both sides of a horizontal deflection plane which coincides with the said planein which the three electron beams are emitted.
  • the vertical deflection coils 15 are situated on both sides of a vertical deflection plane which is perpendicular to the horizontal deflection plane and which, consequently, coincides with the plane of the drawing.
  • the ring core 17 is made of a ferromagnetic material, preferably ferrite. It is flared .in the forward direction so that it fits aboutthe deflection coil pairs 13, 15 with little play. I
  • FIG. 2 shows a front view of a display screen 7 with a part of such a raster, i.e., the central horizontal line 19, a horizontal line 21 which is situated near the top of the display screen, and a horizontal line 23 which is situated near the bottom of the screen.
  • the other lines of the raster have been omitted for the sake of clarity.
  • the central line 19 extends substantially horizontally over its entire length, whilst the upper line 21 and the lower line 23 are bent towards the centre of the display screen 7 near their ends. The ends of these lines have shifted towards the centre over a distance d.
  • Measurements performed on display tubes having a display screen dimensioned 52 X 39 cm revealed a value of 12 mm for d. This value is so high, that it is very difficult to correct the defect completely by adaptation of the deflection currents in the deflection coils 13, 15. Complex and expensive circuits would be required for this purpose.
  • FIG. 3 shows a section of the ring core 17 which is taken along the line III-III in FIG. 1, a number of lines of force 25 of the magnetic 29, with the result that at this area a substantially purely vertical deflection of the electron beams takes place.
  • FIG. 5 diagrammatically shows which parameters are of importance in this respect.
  • FIG. 5 is a diagrammatic front view of a ring core 17 comprising four recesses, the largest width of which is b and the largest depth h.
  • the connecting line between the axis of the ring core 17 and the centre of the recess encloses an angle a with the horizontal deflection plane. It was found that the best results are obtained if the values of h, b and a are the same for all four recesses 31, which means that the ring core 17 with the recesses 31 is symmetrical with respect to the two deflection planes.
  • recesses were provided which were dimensioned as follows: a 35, b 50 mm and h 15 mm. The value of d, originally 12 mm, was thus reduced to 4 mm, which can be further corrected using known and comparatively simple means for influencing the deflection current.
  • the recesses 31 can be filled with a suitable, non-ferromagnetic material, for example, epoxy resin.
  • a deflection coil system for a colour television display tube having a partly flared outer surface and means for generating three electron beams which are situated substantially in one plane comprising a first pair of saddle-like deflection coils which are adapted to the flared shape and which are arranged on both sides of a first deflection plane which, after mounting of the deflection coil system on the display tube, substantially coincides with the plane of the electron beams, a second pair of saddle-like deflection coils which are adapted to the flared shape and which are arranged on both sides of a second deflection plane which is perpendicular to the first de-' flection plane, a flared ferromagnetic ring core which encloses both coil pairs and which is divided into four quarters by the two deflection planes, and means for correcting raster distortion comprising the ring core provided with a recess in each of the four quarters at the area where its diameter is largest.

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US432304A 1973-02-19 1974-01-10 Deflection coil system for colour television Expired - Lifetime US3913042A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7302257A NL7302257A (xx) 1973-02-19 1973-02-19

Publications (1)

Publication Number Publication Date
US3913042A true US3913042A (en) 1975-10-14

Family

ID=19818257

Family Applications (1)

Application Number Title Priority Date Filing Date
US432304A Expired - Lifetime US3913042A (en) 1973-02-19 1974-01-10 Deflection coil system for colour television

Country Status (9)

Country Link
US (1) US3913042A (xx)
BR (1) BR7401108D0 (xx)
DE (1) DE2405531C3 (xx)
ES (1) ES423336A1 (xx)
FR (1) FR2220870B1 (xx)
GB (1) GB1461121A (xx)
IT (1) IT1002943B (xx)
NL (1) NL7302257A (xx)
SE (1) SE384596B (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034324A (en) * 1974-09-20 1977-07-05 Tokyo Shibaura Electric Co., Ltd. Deflection device for use in color television receiver
US4431979A (en) * 1980-07-22 1984-02-14 U.S. Philips Corporation Synthetic resin-bonded electromagnetic component and method of manufacturing same
US4823100A (en) * 1985-07-31 1989-04-18 Rca Licensing Corporation Deflection distortion correction device
EP0701267A3 (en) * 1994-09-05 1996-11-27 Matsushita Electronics Corp Deflection coil and color cathode ray tube with deflection coil
CN1068974C (zh) * 1995-11-30 2001-07-25 Lg电子株式会社 布老恩管偏转系统的附加线圈
CN1069784C (zh) * 1995-10-26 2001-08-15 Lg电子株式会社 阴极射线管偏转系统的铁氧体磁芯
EP1162643A1 (en) * 1999-03-15 2001-12-12 TDK Corporation Core for deflection yoke and its production method
US6373180B1 (en) 1997-07-28 2002-04-16 Thomson Licensing S.A. Deflection yoke for a cathode-ray tube with both improved geometry and convergence
EP1282149A2 (en) * 2001-08-01 2003-02-05 Matsushita Electric Industrial Co., Ltd. Deflection york and CRT device using the deflection york
US20220396395A1 (en) * 2021-06-11 2022-12-15 Fujifilm Business Innovation Corp. Support tool and carrying tool

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2506268C2 (de) * 1975-02-14 1977-01-20 Standard Elektrik Lorenz Ag Ablenksystem fuer farbfernsehbildroehren
DE4208484C2 (de) * 1992-03-14 1998-09-17 Ald Vacuum Techn Gmbh Magnetisches Ablenksystem für einen Hochleistungs-Elektronenstrahl

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821671A (en) * 1953-03-18 1958-01-28 Rca Corp Deflection yoke
US3731241A (en) * 1969-09-18 1973-05-01 Science Res Council Electrical coils for generating magnetic fields

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821671A (en) * 1953-03-18 1958-01-28 Rca Corp Deflection yoke
US3731241A (en) * 1969-09-18 1973-05-01 Science Res Council Electrical coils for generating magnetic fields

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034324A (en) * 1974-09-20 1977-07-05 Tokyo Shibaura Electric Co., Ltd. Deflection device for use in color television receiver
US4431979A (en) * 1980-07-22 1984-02-14 U.S. Philips Corporation Synthetic resin-bonded electromagnetic component and method of manufacturing same
US4823100A (en) * 1985-07-31 1989-04-18 Rca Licensing Corporation Deflection distortion correction device
EP0936657A3 (en) * 1994-09-05 2000-03-15 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with the deflection yoke
US5932959A (en) * 1994-09-05 1999-08-03 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with deflection yoke
EP0936657A2 (en) * 1994-09-05 1999-08-18 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with the deflection yoke
EP0936656A2 (en) * 1994-09-05 1999-08-18 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with the deflection yoke
EP0701267A3 (en) * 1994-09-05 1996-11-27 Matsushita Electronics Corp Deflection coil and color cathode ray tube with deflection coil
EP0936656A3 (en) * 1994-09-05 2000-03-15 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with the deflection yoke
US5783901A (en) * 1994-09-05 1998-07-21 Matsushita Electronics Corporation Deflection yoke with a core having a higher magnetic reluctance at the top and bottom portions than the sides
CN1069784C (zh) * 1995-10-26 2001-08-15 Lg电子株式会社 阴极射线管偏转系统的铁氧体磁芯
CN1068974C (zh) * 1995-11-30 2001-07-25 Lg电子株式会社 布老恩管偏转系统的附加线圈
US6373180B1 (en) 1997-07-28 2002-04-16 Thomson Licensing S.A. Deflection yoke for a cathode-ray tube with both improved geometry and convergence
EP1162643A1 (en) * 1999-03-15 2001-12-12 TDK Corporation Core for deflection yoke and its production method
EP1162643A4 (en) * 1999-03-15 2006-12-06 Tdk Corp BONDING NECK CORE AND CORRESPONDING PRODUCTION PROCESS
EP1282149A2 (en) * 2001-08-01 2003-02-05 Matsushita Electric Industrial Co., Ltd. Deflection york and CRT device using the deflection york
EP1282149A3 (en) * 2001-08-01 2003-03-12 Matsushita Electric Industrial Co., Ltd. Deflection york and CRT device using the deflection york
US20220396395A1 (en) * 2021-06-11 2022-12-15 Fujifilm Business Innovation Corp. Support tool and carrying tool

Also Published As

Publication number Publication date
NL7302257A (xx) 1974-08-21
AU6560074A (en) 1975-08-14
BR7401108D0 (pt) 1974-09-10
IT1002943B (it) 1976-05-20
FR2220870B1 (xx) 1978-04-21
DE2405531C3 (de) 1978-09-21
DE2405531B2 (de) 1978-01-12
GB1461121A (en) 1977-01-13
ES423336A1 (es) 1976-04-16
SE384596B (sv) 1976-05-10
DE2405531A1 (de) 1974-08-22
FR2220870A1 (xx) 1974-10-04

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