GB2187883A - Deflection yoke apparatus with auxiliary coils for reducing unwanted radiation - Google Patents
Deflection yoke apparatus with auxiliary coils for reducing unwanted radiation Download PDFInfo
- Publication number
- GB2187883A GB2187883A GB08703659A GB8703659A GB2187883A GB 2187883 A GB2187883 A GB 2187883A GB 08703659 A GB08703659 A GB 08703659A GB 8703659 A GB8703659 A GB 8703659A GB 2187883 A GB2187883 A GB 2187883A
- Authority
- GB
- United Kingdom
- Prior art keywords
- deflection
- deflection yoke
- coils
- auxiliary
- magnetic field
- 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.)
- Granted
Links
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
- H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
- H01J2229/0015—Preventing or cancelling fields leaving the enclosure
Abstract
Unwanted radiation is reduced by supplying a pair of additional saddle coils (7)(8) (Figure 3, not shown) with current which varies in the same way as that to a pair of horizontal deflection coils (14, 15) (Figure 6, not shown). The horizontal deflection coils and a pair of vertical deflection coils 2, 3 are separated by a coil separator 4 having expanded end portions 5, 6 on which is mounted an auxiliary coil bobbin 10. The bobbin 10 defines grooves 11a, 11b for the saddle coils (7)(8). <IMAGE>
Description
SPECIFICATION
Deflection yoke apparatus with auxiliary coils for reducing unwanted radiation
BACKGROUND OF THE INVENTION
The present invention relates to a deflection yoke apparatus which is mounted on a cathode-ray tube to be used for television receivers, display units, etc., particularly a deflection yoke apparatus provided with auxiliary coil units for reducing an intensity of leaking magnetic field externally radiated from the deflection yoke.
As well known, in case of video equipment such as television receivers and display units which employ a cathode-ray tube, a deflection yoke is mounted on the neck part of the cathode-ray tube and pictures are obtained on the screen by deflecting electron beam(s) by a magnetic field generated when a deflection current is supplied to horizontal and vertical deflection coils.
In this case, a leaking magnetic field generated inside the deflection yoke contributes to deflection of electron beam(s). Leaking magnetic field which diverges out of the deflection yoke, that is, external leaking magnetic field hardly contributes to the function of the deflection yoke. Since the function of the deflection yoke utilizes the leaking magnetic field, the measures for reducing external leaking magnetic field are almost never taken.
Recently, personal computers have been widely used and accordingly the display units employing the cathode-ray tubes have also been widely used in an increasing number. In addition, the display units use a high frequency deflection current to display a number of characters. Therefore, of external leaking magnetic field of the deflection yoke which has not been a problem, a high frequency magnetic field generated from the horizontal deflection coil may act as a magnetic interference to other to cause electronic equipment to malfunction.
Conventionally, therefore, a magnetism shielding cylinder which surrounds the deflection yoke has been provided to reduce electromagnetic interference.
However, the provision of the magnetism shielding cylinder around the deflection yoke is disadvantageous in that a large space is required around the deflection yoke and a large housing is required for a display unit and in that the magnetism shielding cylinder results to form a path of external leaking magnetic field and a specified field distribution is formed inside the magnetism shielding cylinder to affect electron beam(s), thus resulting in mislanding or misconvergence.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a deflection yoke apparatus provided with auxiliary coil units for reducing external leaking magnetic field generated from a deflection yoke.
Another object of the present invention is to provide a deflection yoke apparatus provided with auxiliary coil units for reducing unwanted radiation diverged from a deflection yoke without adverse effect on landing, convergence, deflection distortion, etc. of a cathode-ray tube.
The deflection yoke apparatus in accordance with the present invention is provided with the deflection yoke which comprises a pair of horizontal deflection coils, a pair of vertical deflection coils and the coil separator between these pairs of deflection coils and the auxiliary coil units which are provided to surround the deflection yoke. Each auxiliary coil unit is provided with a front annular part, a rear annular part and a coupling part which couples these annular parts, and a pair of auxiliary coils are wound or fitted in the shape of saddle around the auxiliary coil bobbin having winding grooves on its annular parts and the coupling part along the winding grooves. The auxiliary coil bobbin is integrally formed in the shape of framework or made up to be a framework by combining a pair of half bobbins.
The front annular part of the auxiliary coil unit is arranged directly on or near the external surface or the side of the front expanded section of the deflection yoke, and the rear annular part is arranged directly on or near the external surface or the side of the rear expanded section of the deflection yoke. In addition, the coupling part is arranged on the surface of a pair of horizontal deflection coils combined. If a plurality of coupling parts are required, they are arranged in a circumferential direction surrounding the array of combined horizontal deflection coils, that is, the circumferential direction of the deflection yoke.The auxiliary coil is supplied with the horizontal deflection current or a current which varies in the cycle of horizontal deflection and generates a magnetic field which cancels a part of external leaking magnetic field diverged from the deflection yoke. In other words, the auxiliary coil parts positioned at the front and rear annular parts of the auxiliary coil unit cancel a part of external leaking magnetic field generated from the horizontal deflection coils positioned at the front and rear expanded sections of the deflection yoke, and the auxiliary coil part of the coupling part cancels a part of external leaking magnetic field generated from the horizontal deflection coil part positioned at the flared section of the deflection yoke.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a deflection yoke which is generally used,
Figure 2 is a perspective view of the auxiliary coil
bobbin in accordance with the present invention for winding or fitting the auxiliary coils as viewed from the rear,
Figure 3 is a side view showing an embodiment of the deflection yoke apparatus in accordance with the present invention,
Figure 4 is a rear view of the deflection yoke
apparatus shown in Figure 3,
Figure 5 is an example of connection of the
horizontal deflection coil and the auxiliary coil in the
deflection yoke apparatus of the present invention,
Figure 6 illustrates the outline of operation of the
deflection yoke apparatus of the present invention,
Figure 7 illustrates the method for measuring
unwanted radiation from the deflection yoke,
Figures 8 and 10 respectively show another embodiment of the auxiliary coil bobbin related to the present invention,
Figure 9 shows another embodiment of the deflection yoke apparatus of the present invention using the bobbin shown in Figure 8, and
Figures 11 and 12 respectively show another embodiment of the deflection yoke apparatus of the present invention using the bobbin shown in Figure 10.
DETAILED DESCRIPTION OF THE INVENTION
Referring to Figure 1, there is shown the deflection yoke which generally comprises a pair of horizontal deflection coils not shown, a pair of vertical deflection coils 2 and 3 which are toroidally wound around the annular ferrite deflection core 1 and the molded plastic coil separator for ensuring electrical insulation between horizontal deflection coils and vertical deflection coils. The coil separator is provided with the flared section 4 which surrounds the horizontal deflection coils, the front expanded section 5 which is radially expanded at the largest diameter opening end of the flared section 4 and the rear expanded section 6 which is radiaily expanded at the least diameter opening end of the flared section 4.The front expanded section 5 has the front side wall 5a which extends in the radial direction from the flared section 4 and the cylindrical edge 5b extends from the external periphery of the side wall 5a in a direction opposite to the deflection coils 2 and 3. The rear wall 6c is formed in parallel to the side wall 6a from the periphery 6b.
Referring to Figure 2, there is shown the auxiliary coil bobbin 10 of the auxiliary coil unit in accordance with the present invention. The coil bobbin 10 is provided with the front annular part 11 to be mounted on the cylindrical periphery 5b of the coil separator, the rear annular part 12 to be mounted on the square tubular periphery 6b of the coil separator and a pair of coupling parts 13, which couple these annular parts. The coupling parts 13, 13 are respectively provided with two parallel grooves 13a and 1 3b which communicate with the circumferential grooves 11a and 11b provided on the front annular part 11.The rear annular part 12 is formed by linear portions 121,121 which vertically extend from the ends of coupling parts 13, 13 and retracted portions 122, 122 which are continuously provided to communciate both ends of these linear portions. The retracted portions 122, 122 are respectively provided with the upwardly opened groove 122a and the downwardly opened groove 122b. The linear portions 121, 121 are provided with the guide parts 121 a and 121 b for winding the conductor from parallel grooves 13a and 13b of the coupling parts 13, 13 through the upwardly opened groove 122a and the downwardly opened groove 122b.
Figure 3 shows the side view of the deflection yoke apparatus in accordance with the present invention and Figure 4 shows the rear view of said apparatus. The deflection yoke apparatus is formed by mounting the auxiliary coil units on the deflection yoke shown in Figure 1 and thus electrically connecting the deflection coils and the auxiliary coils. The auxiliary coil units are made up by winding the auxiliary coils 7 and 8 around the coil bobbin 10 shown in Figure 2. Specifically, the auxiliary coil 7 is wound in the shape of saddle through grooves 1 la, 13a and 122a of the coil bobbin and similarly the auxiliary coil 8 is wound in the shape of saddle through grooves 11 b, 13b and 122b.In other words, the auxiliary coil can be wound directly around the coil bobbin or the auxiliary coil which are wound in the shape of saddle in advance can be fitted into the groove of the coil bobbin. The coil is made up by winding a strand of five 0.4 d mm copper wires in five turns.
The front annular part 11 of the auxiliary coil unit is mounted on the front expanded section 5 of the deflection yoke and similarly the rear annular part 12 is mounted on the rear expanded section 6 of the deflection yoke. In this case, the linear portion 121 of the rear annular part 12 contacts the rear wall 6a of the rear expanded section 6 and the retracted portion 122 of the rear annular part 12 contacts the rear wall portion 6e of the rear expanded section 6.
In this configuration, when the auxiliary coil units are to be mounted on the deflection yoke from the rear expanded section 6 of the deflection yoke, the auxiliary coil units are mounted in a previously specified arrangement and fixed with the bonding agent or the like. Auxiliary coils 7 and 8 are connected in parallel and, for example as shown in
Figure 5, in series to the horizontal deflection coils 14 and 15. This means that a current as same as the horizontal deflection current which flows through the horizontal deflection coils flows in the auxiliary coils. If the horizontal deflection current of a magnitude different from the current flowing through the horizontal deflection coils is to be supplied to the auxiliary coils, the auxiliary coils are connected to another power supply capable of supplying a horizontal deflection cycle current.
Figure 6 shows partly the deflection yoke apparatus as a cross sectional view to illustrate the operation of the auxiliary coils. For the horizontal deflection coils 7 and 8 of the deflection yoke, a high frequency current of approximately 15.75 kHz flows in general television receivers and a high frequency current of approximately 32 or 64 kHz flows in the character display units. If the magnetic field having one of these frequencies leaks outside the deflection yoke, other electronic equipment may be affected by electromagnetic interference. In other words, the magnetic field HD of the magnetic field HB generated from the horizontal deflection coils 7 and 8 contributes to deflection of electron beam(s) as the horizontal deflection magnetic field but the remaining magnetic field HR leaks outside the deflection yoke. The horizontal deflection current of the same direction as the horizontal deflection coil is supplied to the auxiliary coils to generate the cancel magnetic field HC. The cancel magnetic field HC acts in a direction opposite to the external leaking magnetic field HR to cancel a part of the external leaking magnetic field. In other words, the cancel magnetic field generated from the auxiliary coil parts located at the front and rear annular parts of the auxiliary coil units cancels a part of external leaking magnetic field generated from the horizontal deflection coils located at the front and rear expanded sections of the deflection yoke.The cancel magnetic field generated from the auxiliary coil part of the coupling part cancels a part of external leaking magnetic field generated from the horizontal deflection coil part located at the flared section of the deflection yoke.
According to the experiments, as shown in Figure 7, an antenna for measuring unwanted radiation was installed at a position 3 meters away from the center of the deflection yoke apparatus in a direction of the plane which horizontalily separates a pair of horizontal deflection coils 14 and 15, that is, in the horizontal direction in the figure. When the horizontal deflection current of 15.75 kHz is supplied to the horizontal deflection coils 14 and 15, unwanted radiation of 28dB, if there are provided no auxiliary coils, can be reduced to 20dB as much as approximately 30% by cancel magnetic field HC generated from the auxiliary coils 7 and 8.
Figure 8 shows another embodiment of the auxiliary coil bobbin 20 of the auxiliary coil unit. A major difference from the coil bobbin 10 shown in
Figure 2 is that two rows of coupling parts 24,25,26 and 27 are provided at upper and lower positions in addition to the coupling part 23 which communicates to the front annular part 21 and the rear annular part 22. Each of these coupling parts 23 to 27 is provided with parallel grooves 23a, 23b, 24a, 25a, 26a and 27a which continue to the circumferential groove 21a of the front annular part 21.
Figure 9 shows the deflection yoke apparatus formed by mounting the auxiliary coil unit using the coil bobbin 20 as shown in Figure 8 on the deflection yoke as shown in Figure 1. The auxiliary coils 28 and 29 are saddle-shaped using the grooves 21a, 23a, 24a, 26a, 222a and 21 23b, 25a, 27a, 222b of the coil bobbin. In this case, the auxiliary coils 28 and 29 are adapted so that the number of conductors is largest in the grooves 23a and 23b of the coupling part 23 as compared with other grooves 24a to 27a and smallest in the grooves 26a and 27a as compared with other grooves 23, 24a and 25a. This auxiliary coil reduces unwanted radiation of external leaking magnetic field from the deflection yoke as shown in Figure 3 but the effect of reduction is largerthan in Figure 3.
Figure 10 shows another embodiment of the auxiliary coil bobbin 30 to be employed in the auxiliary coil unit. The coil bobbin 30 comprises a pair of saddle type half bobbins 30a and 30b and each half bobbin is formed by front half annular parts 31 and 32, rear half annular parts 33 and 34 and coupling parts 35 and 36 which connect these annular parts. These half annular parts 31 to 34 and coupling parts 35 and 36 are respectivley provided with circumferential grooves 31 32a, 33a and 34a and the parallel grooves 35a and 36a, and these grooves are communicated each other in each half bobbin. The auxiliary coils are wound through these grooves 31a and 36a orthe previously wound auxiliary coils are fitted into the grooves 31a to 35a, thus being supported.
Figure 11 shows the deflection yoke apparatus provided with the auxiliary coil units using the coil bobbin 30 shown in Figure 10. The auxiliary coil unit is inserted between the front expanded section 5 and the rear expanded section 6 of the deflection yoke and the coupling parts 35 and 36 of half bobbins 30a and 30b are aligned and integrally fixed with, for example, a bonding agent. This configuration is advantageous in that the whole shape of the deflection yoke apparatus will not be large even if the auxiliary coil units are mounted on the deflection yoke.
Figure 12 shows a variation of the embodiment shown in Figure 11. In other words, the front half annular parts 31 and 32 of the coil bobbins of the auxiliary coil units are arranged on the front expanded section 5 of the deflection yoke. This configuration is advantageous in that the installing position of the auxiliary coil units need not be changed even when the vertical deflection coils are changed from the toroidal type to the saddle type.
In the embodiments shown in Figures 11 and 12, the auxiliary coil unit is fixed to the deflection yoke aftertheengaging part not shown has been provided on the coil separator. Provison of this engaging portion can easily be done by any design.
In these embodiments, the rear half annular parts 32a and 34a of the coil bobbin can be arranged on the rear expanded section 6 of the deflection yoke.
In other words, the configuration is satisfactory if the half annular parts 31 to 34 of the auxiliary coil units are arranged in the vicinity of the bent portions (which are extended at right angles to the axis of deflection) of the horizontal deflection coils 14 and 15. This can also apply to the variation of the embodiments of the deflection yoke apparatus as shown in Figures 3 and 9.
The present invention, as described above, provides an advantage to reduce the possibility of electromagnetic interference attributable to the deflection yoke, and the embodiments of the present invention can be varied in the scope of the objects of the invention. Specifically, the grooves provided on the coil bobbin of the auxiliary coil unit can be modified to a type of groove along which the auxiliary coil can easily be wound or a type of groove to which the auxiliary coil which has been previously wound in the saddle type can easily be fitted. For the vertical deflection coils, the saddle type coil can be used instead of being toroidally wound around the core. In addition, the diameter of a conductor, number of conductors to be wound at a time and the number of turns of the auxiliary coil are varied in accordance with the impedance of the horizontal deflection coil. For simultaneous winding of several conductors, they can be used as a stand our a bifilarcoil.
Claims (7)
1. A deflection yoke apparatus which is mounted on a neck of cathode-ray tube which produces at least one raster on its screen by scanning at least one electron beam and serves to deflect said electron beam, comprising
(a) a deflection yoke, said annular part being provided with a pair of horizontal deflection coils, a pair of vertical deflection coils, a coil separator which is provided between said both pairs of deflection coils to electrically separate these pairs of deflection coils and has a cylindrically flared section and front and rear expanded sections which are respectively formed at its open ends, and an annular deflection core which forms a path for a magnetic field generated when a deflection current is supplied to said horizontal and vertical deflection coils,
(b) an auxiliary coil bobbin to be provided on the outside of said deflection yoke, said auxiliary coil bobbin having front and rear profiled parts, said profiled parts being provided with a winding groove, respectively, and
(c) a pair of saddle type auxiliary coils which are supported utilizing said winding grooves of said coil bobbin, said pair of saddle type auxiliary coils being supplied with a current to generate a cancel magnetic field which cancels a magnetic field externally leaking from the deflection yoke which is contained in a magnetic field generated from the deflection coils.
2. A deflection yoke apparatus in accordance with
Claim 1, wherein said auxiliary coil bobbin is integrally formed.
3. A deflection yoke apparatus in accordance with
Claim 1,wherein said auxiliary coil bobbin is formed by a pair of half bobbins each of which is provided with said front and rear profiled parts and said coupling parts.
4. A deflection yoke apparatus in accordance with
Claim 1, wherein a plurality of coupling parts are provided between the front profiled part and the rear profiled part.
5. A deflection yoke apparatus in accordance with
Claim 1, wherein said front and rear profiled parts are arranged at the positions of the front and rear expanded sections, respectively.
6. A deflection yoke apparatus in accordance with
Claim 1, wherein said auxiliary coils are connected to said horizontal deflection coils to supply a horizontal deflection current.
7. A deflection yoke apparatus substantially as hereinbefore described with reference to and as illustrated in Figs. to 6, Figs. 8 and 9, Figs. 10 and 11 or Figs. 10 and 12 of the accompanying drawings.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3244186 | 1986-02-17 | ||
| JP3622586 | 1986-02-20 | ||
| JP5561486 | 1986-03-13 | ||
| JP6366086 | 1986-03-19 | ||
| JP8633686U JPS62198653U (en) | 1986-06-06 | 1986-06-06 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8703659D0 GB8703659D0 (en) | 1987-03-25 |
| GB2187883A true GB2187883A (en) | 1987-09-16 |
| GB2187883B GB2187883B (en) | 1990-04-11 |
Family
ID=27521414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8703659A Expired - Lifetime GB2187883B (en) | 1986-02-17 | 1987-02-17 | Deflection yoke apparatus with auxiliary coils for reducing unwanted radiation |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3704648C3 (en) |
| GB (1) | GB2187883B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2208034A (en) * | 1987-08-13 | 1989-02-15 | Ibm | Reducing magnetic radiation in front of a cathode ray tube screen |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0485559U (en) * | 1990-11-29 | 1992-07-24 | ||
| JP2575394Y2 (en) * | 1992-12-30 | 1998-06-25 | 株式会社村田製作所 | Deflection yoke device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR900001503B1 (en) * | 1985-09-13 | 1990-03-12 | 미쓰비시전기 주식회사 | Radiation suppression device |
-
1987
- 1987-02-14 DE DE19873704648 patent/DE3704648C3/en not_active Expired - Lifetime
- 1987-02-17 GB GB8703659A patent/GB2187883B/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2208034A (en) * | 1987-08-13 | 1989-02-15 | Ibm | Reducing magnetic radiation in front of a cathode ray tube screen |
| AU600158B2 (en) * | 1987-08-13 | 1990-08-02 | International Business Machines Corporation | Magnetic shunt for deflection yokes |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3704648A1 (en) | 1987-08-20 |
| GB8703659D0 (en) | 1987-03-25 |
| GB2187883B (en) | 1990-04-11 |
| DE3704648C2 (en) | 1992-09-03 |
| DE3704648C3 (en) | 1997-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| 732D | Request for correction of an error in the register (sect. 32(2)(d)/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 20070216 |