US3321724A - Deflection yoke core slotted for vertical toroidal coils - Google Patents
Deflection yoke core slotted for vertical toroidal coils Download PDFInfo
- Publication number
- US3321724A US3321724A US430416A US43041665A US3321724A US 3321724 A US3321724 A US 3321724A US 430416 A US430416 A US 430416A US 43041665 A US43041665 A US 43041665A US 3321724 A US3321724 A US 3321724A
- Authority
- US
- United States
- Prior art keywords
- core
- coils
- slots
- recesses
- yoke
- 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
Links
- 230000005294 ferromagnetic effect Effects 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 6
- 239000004020 conductor Substances 0.000 description 12
- 238000010894 electron beam technology Methods 0.000 description 9
- 238000004804 winding Methods 0.000 description 5
- 239000012212 insulator Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 230000003467 diminishing effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Images
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
- H01J29/766—Deflecting by magnetic fields only using a combination of saddle coils and toroidal windings
Definitions
- This invention relates to electromagnetic deflection yokes for cathode ray tube beams and particularly to the ferromagnetic cores used with such yokes.
- Electromagnetic beam deflection yokes usually 'are provided with ferromagnetic cores for the purpose of increasing the efliciency of these yokes in deflecting the electron beams of cathode ray tubes.
- the cores encircle the active conductors of the coils of the deflection yokes and provide low reluctance return paths for the flux genera-ted by the coils.
- the horizontal coils are of saddle form and the vertical coils are of toroidal form. Accurate positioning of each coil comprising a pair of horizontal or vertical coils relative to one another is required to minimize distortion of the raster scanned by the electron beam.
- each of the pair of horizontal coils must have its centerline at right angles to the centerline of each of the pair of vertical coils. must be accurately located 180 from one another in order to avoid the possibility of a trapezoidal or other undesired deformation of the scanned raster.
- deflection yokes Another requirement of deflection yokes, particularly those for deflecting electron beams through relatively large angles, is the avoidance of beam defocusing. Fringe fields at the rear end of such deflection yokes adjacent to the electron gun and focus electrode of the tube have been found to be one of the factors tending to cause beam defocusing.
- Another object of the invention is to provide a ferromagnetic core for a deflection yoke which is designed to reduce the fringe field at the rear of the yoke so as to minimize beam defocusing.
- Still another object of the invention is to provide a ferromagnetic core for a deflection yoke which is so constructed as to require no insulation between it and the toroidal coils wound upon it.
- the ferromagnetic core of a deflection yoke has a pair of diametrically opposed slots formed internally thereof and extending from the rear end to the front end thereof.
- the toroidal coils may be wound in the slots and thereby will be accurately positioned 180 from one another.
- the core also may have a pair of recesses formed in the rear end thereof in communication with the respective slots. When the toroidal coils are received in these recesses the undesired fringe field at the rear of the yoke is reduced.
- the front and rear ends of the core may be rounded, at least in the regions of the slots and recesses, so as to In particular, the toroidal vertical coilssubstantially avoid rupture of the insulation of the wire of the toroidal coils.
- FIGURE 1 is a perspective view of the yoke embodying a core in accordance with the invention.
- FIGURE 2 is a somewhat enlarged sectional view taken on the line 22 of FIGURE 1 showing the relationship of the saddle type horizontal coils, the toroidal type vertical coils and the insulation between these different coils;
- FIGURE 3 is a view taken on the line 3-3 of FIG- URE 2 and is a transverse section toward the rear, or electron gun, end of the yoke showing the interlocking relationship between the horizontal and vertical;
- FIGURE 4 is a top view of the core showing the recesses formed in the rear end thereof;
- FIGURE 5 is a front view of the core embodying the present invention showing its oval transverse configuration
- FIGURE 6 is a side view of the core.
- FIGURES l, 2 and 3 The general arrangement of a deflection yoke embodying the invention is shown in FIGURES l, 2 and 3 in which corresponding parts are identified by the same reference characters.
- the yoke comprises a pair of saddle type horizontal coils 11 and 12 which have active conductors 13 and 14, respectively, and which extend generally longitudinally of the cathode ray tube (not shown) with which the yoke may be used.
- the active conductors 13 on opposite sides of the yoke of the coil 11 are joined at the forward or screen end of the yoke by end turns 15 and at the rear or electron gun end by end turns 16.
- the coil 12' is provided with forward end turns 17 and rear end turns 18.
- a toroidal type vertical deflection coil 19 is disposed entirely within the window formed between the active conductors such as 13 of coil 11.
- a toroidal vertical coil 21 is mounted in the window space between the active conductors 14 of the horizontal coil 12.
- An in sulator 22 is placed on the undersides of the horizontal coils 11 and 12 so as to insulate these coils from a ferromagnetic core 23 which encircles the coils.
- the insulator 22 also, provides a small insulating barrier between the outer extremities of vertical coils 19 and 21 and the window edges of horizontal coils 11 and 12, respectively.
- the insulator which comprises two identical halves for ease of assembly, additionally protectively envelopes the end turns 16 and 18 of the horizontal coils 11 and 12 as shown in FIGURE 2.
- the core 23, in a direction longitudinally of the yoke, has a rear straight portion 24 and a forward flared portion 25.
- This configuration corresponds generally to the overall shape of the deflection yoke so that the relatively straight portion encircles the tubular neck section of the cathode ray tube and the flared portion encircles the bulb section of the tube.
- the insulator 22 also has inwardly extending ribs 26 and 27 to separate the active conductors such as 13 and 14, respectively, of the hor'montal coils 11 and 12 and to accurately position the coils in the yoke.
- each of the toroidal coils such as 21 is made up of a number of turns of wire around the core 23.
- This figure also shows the physical relationship between the vertical deflection ooil such as 21 and the horizontal coil such as 12. 7
- FIGURE 3 shows the oval configuration of the core 23 in which are indicated the major axis 28 and minor axis 29.
- the active conductors of the horizontal coils 11 and 12 are disposed generally at the extremities of the major axis 28 of the core and the vertical coils 19 and 21 are located generally at axis 29 of the core. It will be understood that, with the the extremities of the minor.
- the internal shape of the yoke is substantially circular so that it may fit snugly over the circular parts of the cathode ray tube with which it is to be used.
- FIGURES 4 and 6 Details of the ferromagnetic core in accordance with the invention are more clearly shown in FIGURES 4, and 6.
- the core 23 is oval shaped as previously described having a major axis 28 and a minor axis 29. Slots 31 and 32 are provided internally of the core 23 at opposite ends of the minor axis 29. These slots extend generally from the large forward end 33 of the core 23 to the relatively small rear end 34 of the core. These slots have their maximum depths at the rear of the core as indicated at points 35 and decrease in depth toward the front of the core, finally merging with the front end 33 as indicated at points 36. As indicated more clearly in FIGURES 4 and 6 the slots 31 and 32 terminate respectively in recesses 37 and 38 formed in the rear ends 34.
- the purpose of the slots 31 and 32 and recesses 37 and 38 is to receive the toroidally wound vertical coils of the deflection yoke.
- the toroidal coils may be placed on the core without any uneven building up of the coil at the front and rear ends of the yoke.
- These features also enable the accurate positioning of the vertical coils relative to one another and to the horizontal coils and thereby minimize distortions such as trapezoidal misshaping of the raster scanned by the electron beam.
- the inside dimensions of the core may be made smaller, thereby bringing the core closer to the electron beam of the cathode ray tube which significantly increases the deflection efliciency of the yoke.
- the recesses 37 and 38 at the rear end 34 of the core 23 enable the positioning of the conductors of the toroidal coils in such a way as to reduce the extent of the fringe field produced thereby at the back of the yoke and consequently minimize the amount of beam defocusing which otherwise might result from a fringe field reaching into the electron gun region of the cathode ray tube.
- the front and rear ends 33 and 34, respectively, of the core 23 are rounded as indicated at points 39 and 40 so that the toroidal vertical coils may be wound on the core at high speed under considerable tension without any insulation being provided between the wire and the core except for the enamel or other type of insulation provided on the wire itself.
- the core 23 is molded of suitable ferrite material in its final form such as shown in FIGURES 4, 5 and 6. It is then broken into two pieces approximately along lines 42 and 43 corresponding generally with the major axis 28, after which each part is placed in a winding machine for the placement thereon of the two toroidal coils. It has been found that, with a core such as that described and embodying the present invention having features such as the rounded front and rear ends indicated at points 38 and 39, the fabrication of such yokes may be materially facilitated without the provision of extra insulation which previously has been found necessary between the toroidal windings and the cores upon which they are wound. It is, however, advisable that the ferrite core be fabricated from a mixture, which after processing, has sufficient skin or surface resistance to provide the necessary electrical isolation of the vertical toroidal coils from the yoke without any additional insulation.
- a ferromagnetic core encircling said cathode ray tube and having an oval transverse cross-section with a minor axis in one of said orthogonal directions and a major axis in the other of said orthogonal directions.
- said core having a pair of slots formed internally thereof centered about the extremities of said minor axis and extending from the rear end to the front end of said core,
- said core also having a pair of recesses formed in said rear end in communication with said respective slots
- said front and rear ends of said core being rounded at least in the regions of said slots and recesses so that toroidal type coils may be supported by and in direct physical contact with said slots and recesses without rupture of the insulation of the wire of said coils.
- an electromagntic yoke including a pair of toroidal type coils for deflecting the electron beam of a cathode ray tube in one of two orthogonal directions, both of said coils having active conductors extending longitudinally of said cathode ray tube;
- a ferromagnetic core encircling said cathode ray tube and having an oval transverse cross-section with a minor axis in said one orthogonal direction and a major axis in the other of said orthogonal directions,
- said core being adapted to encompass the active conductors of said coils adjacent the extremities of said minor axis
- said core having a pair of slots formed internally thereof centered about the extremities of said minor axis and extending from the rear end to the front end of said core,
- said core also having a pair of recesses formed in said rear end in communication with said respective slots
- said front and rear ends of said core being rounded at least in the regions of said slots and recesses so that said toroidal type coils may be supported by and in direct physical contact with said slots and recesses without rupture of the insulation of the wire of said coils.
- a ferromagnetic core for said yoke encircling said cathode ray tube in the region of the junction of said neck and bulb sections
- said core longitudinally having a relatively small portion beginning at the rear end of said core and encircling said neck section and a relatively large portion ending at the front end of said core and encircling said bulb section,
- said core having a pair of slots formed internally thereof centered about the extremities of said minor axis and extending from said rear end to said front end, the depth of said slots diminishing from a maximum at said rear end to a merger with said front end,
- said core also having a pair of recesses formed in said rear end in communication with said respective slots
- said front and rear ends of said core being rounded at least in' the regions of said slots and recesses so that said toroidal type coils may be supported by 5 and in direct physical contact with said slots and recesses without rupture of the insulation of the wire of said coils.
- a ferromagnetic core for said yoke encircling said cathode ray tube in the region of the junction of said neck and bulb sections
- said core longitudinally having a relatively straight portion beginning at the rear end of said core and encircling said neck section and a flared portion ending at the front end of said core and encircling said bulb section,
- said core having a pair of slots formed internally thereof centered about the extremities of said minor axis and extending from said rear end to said front end, the depth of said slots diminishing from a maximum at said rear end to a merger with said front end,
- said core also having a pair of recesses formed in said rear end in communication with said respective slots
- said front and rear ends of said core being rounded at least in the regions of said slots and recesses so that said toroidal type coils may be supported by and in direct physical contact with said slots and recesses without rupture of the insulation of the wire of said coils.
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- Video Image Reproduction Devices For Color Tv Systems (AREA)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US430416A US3321724A (en) | 1965-02-04 | 1965-02-04 | Deflection yoke core slotted for vertical toroidal coils |
GB2747/66A GB1137104A (en) | 1965-02-04 | 1966-01-20 | Electromagnetic deflection yoke for cathode ray tubes |
AT52266A AT264607B (de) | 1965-02-04 | 1966-01-20 | Elektromagnetisches Joch zur Ablenkung des Elektronenstrahles einer Kathodenstrahlröhre |
ES0322522A ES322522A1 (es) | 1965-02-04 | 1966-02-02 | Un dispositivo de yugo electromagnetico para desviar el haz de electrones de un tubo de rayos catodicos en dos direcciones ortogonales. |
NL6601395A NL6601395A (US08197722-20120612-C00093.png) | 1965-02-04 | 1966-02-03 | |
SE1394/66A SE311702B (US08197722-20120612-C00093.png) | 1965-02-04 | 1966-02-03 | |
BE676105D BE676105A (US08197722-20120612-C00093.png) | 1965-02-04 | 1966-02-04 | |
FR48446A FR1467422A (fr) | 1965-02-04 | 1966-02-04 | Perfectionnements aux colliers de déviation électromagnétiques pour tubes à rayons cathodiques |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US430416A US3321724A (en) | 1965-02-04 | 1965-02-04 | Deflection yoke core slotted for vertical toroidal coils |
Publications (1)
Publication Number | Publication Date |
---|---|
US3321724A true US3321724A (en) | 1967-05-23 |
Family
ID=23707469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US430416A Expired - Lifetime US3321724A (en) | 1965-02-04 | 1965-02-04 | Deflection yoke core slotted for vertical toroidal coils |
Country Status (7)
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3728653A (en) * | 1971-01-25 | 1973-04-17 | Gte Sylvania Inc | Contoured core for toroidal yokes |
US3891951A (en) * | 1973-03-19 | 1975-06-24 | Philips Corp | Device for the display of colour television images |
US4038621A (en) * | 1976-03-16 | 1977-07-26 | Zenith Radio Corporation | Precision vertical deflection coil for a hybrid television yoke |
DE2826892A1 (de) * | 1977-08-24 | 1979-03-01 | Hitachi Ltd | Ablenkjoch |
US4368445A (en) * | 1981-01-08 | 1983-01-11 | Rca Corporation | Television deflection yoke |
EP1369894A2 (en) * | 2002-06-07 | 2003-12-10 | Matsushita Electric Industrial Co., Ltd. | Deflection yoke and CRT device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2692355A (en) * | 1951-06-29 | 1954-10-19 | Gen Instrument Corp | Cathode-ray tube deflection yoke |
US3035198A (en) * | 1957-03-13 | 1962-05-15 | Philips Corp | Deflection and focusing apparatus for cathode ray tubes |
US3246192A (en) * | 1962-06-19 | 1966-04-12 | Muter Company | Deflection yoke core having non-cylindrical winding bearing surface |
-
1965
- 1965-02-04 US US430416A patent/US3321724A/en not_active Expired - Lifetime
-
1966
- 1966-01-20 AT AT52266A patent/AT264607B/de active
- 1966-01-20 GB GB2747/66A patent/GB1137104A/en not_active Expired
- 1966-02-02 ES ES0322522A patent/ES322522A1/es not_active Expired
- 1966-02-03 NL NL6601395A patent/NL6601395A/xx unknown
- 1966-02-03 SE SE1394/66A patent/SE311702B/xx unknown
- 1966-02-04 BE BE676105D patent/BE676105A/xx unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2692355A (en) * | 1951-06-29 | 1954-10-19 | Gen Instrument Corp | Cathode-ray tube deflection yoke |
US3035198A (en) * | 1957-03-13 | 1962-05-15 | Philips Corp | Deflection and focusing apparatus for cathode ray tubes |
US3246192A (en) * | 1962-06-19 | 1966-04-12 | Muter Company | Deflection yoke core having non-cylindrical winding bearing surface |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3728653A (en) * | 1971-01-25 | 1973-04-17 | Gte Sylvania Inc | Contoured core for toroidal yokes |
US3891951A (en) * | 1973-03-19 | 1975-06-24 | Philips Corp | Device for the display of colour television images |
US4038621A (en) * | 1976-03-16 | 1977-07-26 | Zenith Radio Corporation | Precision vertical deflection coil for a hybrid television yoke |
DE2826892A1 (de) * | 1977-08-24 | 1979-03-01 | Hitachi Ltd | Ablenkjoch |
US4368445A (en) * | 1981-01-08 | 1983-01-11 | Rca Corporation | Television deflection yoke |
EP1369894A2 (en) * | 2002-06-07 | 2003-12-10 | Matsushita Electric Industrial Co., Ltd. | Deflection yoke and CRT device |
EP1369894A3 (en) * | 2002-06-07 | 2005-06-29 | Matsushita Electric Industrial Co., Ltd. | Deflection yoke and CRT device |
Also Published As
Publication number | Publication date |
---|---|
NL6601395A (US08197722-20120612-C00093.png) | 1966-08-05 |
GB1137104A (en) | 1968-12-18 |
ES322522A1 (es) | 1966-08-01 |
SE311702B (US08197722-20120612-C00093.png) | 1969-06-23 |
AT264607B (de) | 1968-09-10 |
BE676105A (US08197722-20120612-C00093.png) | 1966-06-16 |
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