US3891951A - Device for the display of colour television images - Google Patents

Device for the display of colour television images Download PDF

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Publication number
US3891951A
US3891951A US445909A US44590974A US3891951A US 3891951 A US3891951 A US 3891951A US 445909 A US445909 A US 445909A US 44590974 A US44590974 A US 44590974A US 3891951 A US3891951 A US 3891951A
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US
United States
Prior art keywords
deflection
plane
recesses
electron beams
situated
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
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US445909A
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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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    • 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

  • ABSTRACT A display device for colour television images, comprising a cathode-ray tube having three electron beams arranged in one plane and a deflection system comprising a ring core. On the rear of the ring core two recesses are provided at the extremities of a diameter of the ring core which is situated in the said plane.
  • the invention relates to a device for the display of colour television images, comprising a cathode-ray tube of the shadow mask type having a rearmost cylindrical part in which one or more electron guns are arranged for generating a number of electron beams which are situated substantially in one plane. and a foremost flared part.
  • the said device furthermore comprising a deflection system which is coaxially arranged about the tube near the transition between the two parts of the tube and which essentially consists of an annular ferromagnetic core.
  • a first deflection coil system for deflecting the electron beams in a first deflection perpendicular to the tube axis and in the said plane
  • a second deflection coil system for deflecting the electron beams in a second deflectin direction perpendicular to the tube axis and to the said plane
  • the said deflection system being adapted such that the second deflection coil system generates a magnetic field which has a cushion-like shape near the rear of the deflection system and a barrel-like shape near the front.
  • the second deflection coil system then serves for the deflection of these beams in the vertical direction (referred to as the y-direction hereinafter), for which purpose it generates a magnetic field which extends mainly in the x-direction which is perpendicular to the deflection direction. It was found in practice that the field strength is location-dependent and that it contains a y-component H in addition to an x-component H,, For a given value of z (the third coordinate. the value of which increases from the electron guns in the forward direction). the field strength of the vertical deflection field can be represented as:
  • the said Patent Specification also describes how the requirements imposed as regards the deflection field can be satisfied by a suitable choice of the shape and the distribution of turns of the deflection coils.
  • a suitable choice of the shape and the distribution of turns of the deflection coils it was found in practice that the winding of such coils in large numbers with the desired accuracy is difficult.
  • this shape of the coil gives rise to raster distortion which must be corrected by adaptation of the deflection current.
  • the invention has for its object to provide a device of the kind set forth in which the desired shape of the deflection field for the second deflection direction is achieved without the said drawbacks occurring.
  • the device according to the invention is characterized in that on the rear of the ring core recesses are provided in two diametrically situated locations. the connecting line between the recesses being substantially situated in the plane of the electron beams.
  • FIG. I is a diagrammatic longitudinal sectional view of an embodiment of a device according to the invention.
  • FIGS. 2a-c show the vertical deflection field at three locations in the device shown in FIG. 1,
  • FIG. 3 is a side elevation of a ring core used in the device of FIG. I.
  • FIG. 4 is a rear view of the ring core shown in FIG. 3.
  • the device for the display of colour television images which is shown in FIG. I comprises a cathode-ray tube of the known shadow mask type. comprising a rearmost cylindrical portion 1 and a foremost flared portion 3 which has a colour selection electrode (shadow mask) and a display screen (not shown) arranged on its widest end.
  • a deflection system 7 is coaxially arranged about the tube at the area of the transition between the rearmost tube part 1 and the foremost tube part 3.
  • the deflection system 7 comprises an annular ferromagnetic core 9, the shape of which is adapted to the flared shape of the tube.
  • a first deflection coil system 11 for deflecting the electron beams in the horizontal direction (perpendicular to the plane of the drawing). and a second deflection coil system 13 for deflecting the electron beams in the vertical direction.
  • Each of the deflection coil systems 1], l3 consists of a pair of diametrically arranged saddle-like deflection coils, the shape of which is also adapted to the flared shape of the tube.
  • the magnetic fields generated by these deflection coil systems satisfy the requirements imposed in the said Netherlands Pat. No. l l0,569.
  • FIG. 2a shows the field lines on the rear of the deflection system 7, that is to say in a cross-section at the area of the line (1-0 in FIG. 1. It is clearly shown that the shape of the field is cushionlike at this area. On the front of the deflection system. at the area of the line cc. however, the field has a barrel-like shape (see FIG. 20). whilst somewhere between these two extremes there is a section (h-b) where the field is homogeneous. For the sake of clarity, the diameters of the diagrams of FIGS. Za-c are shown to be equal, even though the corresponding sections are ob viously of different diameter.
  • the variation of the vertical deflection field shown in FIG. 2 appears in that the coils constituting the second deflection coil system are wound such that they can be comparatively readily manufactured and produce little raster distortion whilst use is also made, so as to satisfy also the convergence requirements, of a ring core 9 which is shaped as shown in a side elevation in FIG. 3 and in a rear view in H0. 4, and which determines the desired cushionlike distortion of the field on the rear of the deflection system.
  • the ring core 9 is provided on its rear with two recesses which are situated such that their connecting line is situated in the horizontal plane.
  • the shape and the dimensions of the recesses 15 determine the field in the rearmost part of the deflection system. It was found that.
  • the boundary of the recess 15 should preferably be a smooth line.
  • the largest width of the recess 15, denoted by a in FIGS. 3 and 4. deter mines the degree of curvature of the lines of force in the diagram shown in FIG. 2av In a deflection system comprising saddle-like deflection coils, like in the embodiment shown, it was found that this dimension should be between one third and nine tenths of the outer diameter d of the rearmost part of the ring core 9.
  • the depth 11 of the recess 15 is dependent of the size of the display screen of the tube. As the dimensions of this display screen are smaller, it appears that the value of 11 must be higher.
  • a device for the display of colour television images comprising a cathode-ray tube of the shadow mask type having a rearmost cylindrical part in which a plurality of electron guns are arranged for generating a plurality of electron beams which are situated substantially in one plane. and a foremost flared part, the said device furthermore comprising a deflection system which is coaxially arranged about the tube near the transition between the two parts of the tube and which essentially comprises an annular ferromagnetic core having a cylindrical rear section.
  • first deflection coil system for deflecting the electron beams in a first deflection direction perpendicular to the tube axis and in the said plane
  • second deflection coil system for deflecting the electron beams in a second deflection direction perpendicular to the tube axis and to the said plane
  • said deflection system being adapted such that the second deflection coil system generates a magnetic field which has a cushion-like shape near the rear of the deflection system and a barrel-like shape near the front.
  • the rear of the ring core has recesses in two diametrically situated locations, the connecting line between the recesses being substantially situated in the plane of the electron beams, said recesses having a depth at least equal to half the length of the rear section.
  • a device as claimed in claim 1. characterized in that the boundary of the recesses is a smooth line.
  • each of the deflection coil systems comprises a pair of saddle-like, diametrically arranged deflection coils.
  • the largest width of each of the recesses amounting to at least to one third of the outer diameter of the rearmost part of the ring core and at the most to nine tenths of said diameter.
  • a deflection device for coaxial disposition about the transition between two parts of a cathode-ray tube having a rearmost cylindrical part in which a plurality of electron guns are arranged for generating a plurality of electron beams which are situated substantially in one plane.
  • said device comprising an annular ferromagnetic core having a cylindrical rear section, a first deflection coil system means disposed on said core for deflecting the electron beams in a first deflection direction perpendicular to the tube axis and in said plane, and a second deflection coil sys tem means disposed on said core for deflecting the electron beams in a second deflection direction perpendicular to the tube axis and to said plane and for generating a magnetic field which has a cushion-like shape near the rear of the deflection device and a barrel-like shape near the front.
  • the rear of the ring core having recesses disposed in two diametrically situated locations, the recesses defining a plane substantially situated in the plane of the electron beams, said recesses having a depth at least equal to half the length of the rear section.
  • each of the recesses comprises a smooth line boundary.
  • each of the deflection coil systems comprises a pair of saddle-like diametrically arranged deflection coils, each of the recess having a largest width at least equal to one third of the outer diameter of the rearmost part of the ring core and at the most equal to nine tenths of said diameter.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US445909A 1973-03-19 1974-02-25 Device for the display of colour television images Expired - Lifetime US3891951A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7303773.A NL160676C (nl) 1973-03-19 1973-03-19 Inrichting voor het weergeven van kleurentelevisiebeelden.

Publications (1)

Publication Number Publication Date
US3891951A true US3891951A (en) 1975-06-24

Family

ID=19818456

Family Applications (1)

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US445909A Expired - Lifetime US3891951A (en) 1973-03-19 1974-02-25 Device for the display of colour television images

Country Status (13)

Country Link
US (1) US3891951A (it)
JP (2) JPS49128624A (it)
AR (1) AR200179A1 (it)
BE (1) BE812458A (it)
BR (1) BR7402077D0 (it)
CA (1) CA987723A (it)
ES (1) ES424348A1 (it)
FR (1) FR2222749B1 (it)
GB (1) GB1467825A (it)
IT (1) IT1009308B (it)
NL (1) NL160676C (it)
SE (1) SE384597B (it)
ZA (1) ZA741497B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701267A3 (en) * 1994-09-05 1996-11-27 Matsushita Electronics Corp Deflection coil and color cathode ray tube with deflection coil

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5933153Y2 (ja) * 1976-07-21 1984-09-17 株式会社日立製作所 偏向ヨ−ク
JPS5927012Y2 (ja) * 1979-03-31 1984-08-06 株式会社東芝 偏向ヨ−ク
JPS62140342A (ja) * 1985-12-13 1987-06-23 Matsushita Electronics Corp カラ−受像管装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3246192A (en) * 1962-06-19 1966-04-12 Muter Company Deflection yoke core having non-cylindrical winding bearing surface
US3310763A (en) * 1965-02-04 1967-03-21 Rca Corp Deflection yoke coil
US3321724A (en) * 1965-02-04 1967-05-23 Rca Corp Deflection yoke core slotted for vertical toroidal coils
US3430169A (en) * 1965-10-23 1969-02-25 Sanders Associates Inc Deflection yoke

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7003587A (it) * 1970-03-13 1971-09-15

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3246192A (en) * 1962-06-19 1966-04-12 Muter Company Deflection yoke core having non-cylindrical winding bearing surface
US3310763A (en) * 1965-02-04 1967-03-21 Rca Corp Deflection yoke coil
US3321724A (en) * 1965-02-04 1967-05-23 Rca Corp Deflection yoke core slotted for vertical toroidal coils
US3430169A (en) * 1965-10-23 1969-02-25 Sanders Associates Inc Deflection yoke

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701267A3 (en) * 1994-09-05 1996-11-27 Matsushita Electronics Corp Deflection coil and color cathode ray tube with deflection coil
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
US5932959A (en) * 1994-09-05 1999-08-03 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with deflection yoke
EP0936656A2 (en) * 1994-09-05 1999-08-18 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with the deflection yoke
EP0936657A2 (en) * 1994-09-05 1999-08-18 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with the deflection yoke
EP0936656A3 (en) * 1994-09-05 2000-03-15 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with the deflection yoke
EP0936657A3 (en) * 1994-09-05 2000-03-15 Matsushita Electronics Corporation Deflection yoke and color cathode ray tube with the deflection yoke

Also Published As

Publication number Publication date
NL160676B (nl) 1979-06-15
ZA741497B (en) 1975-10-29
BE812458A (fr) 1974-09-18
FR2222749A1 (it) 1974-10-18
NL7303773A (it) 1974-09-23
JPS54183224U (it) 1979-12-26
GB1467825A (en) 1977-03-23
NL160676C (nl) 1979-11-15
IT1009308B (it) 1976-12-10
JPS5546993Y2 (it) 1980-11-05
ES424348A1 (es) 1976-06-16
SE384597B (sv) 1976-05-10
AR200179A1 (es) 1974-10-24
CA987723A (en) 1976-04-20
BR7402077D0 (pt) 1974-12-03
DE2411084B2 (de) 1977-02-10
JPS49128624A (it) 1974-12-10
DE2411084A1 (de) 1974-10-03
AU6678174A (en) 1975-09-18
FR2222749B1 (it) 1978-02-10

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