US3792305A - Deflection yoke with bridge-connected windings - Google Patents

Deflection yoke with bridge-connected windings Download PDF

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US3792305A
US3792305A US00211341A US3792305DA US3792305A US 3792305 A US3792305 A US 3792305A US 00211341 A US00211341 A US 00211341A US 3792305D A US3792305D A US 3792305DA US 3792305 A US3792305 A US 3792305A
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windings
winding
horizontal
vertical
deflection
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J Lister
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RCA Licensing Corp
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General Electric Co
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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

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  • a yoke assembly having windings for producing magnetic fields to deflect an electron beam in a predetermined manner.
  • a first and a second set of windings are disposed upon a core for deflecting the electron beam in a vertical anda horizontal sense, respectively.
  • a set of four auxiliary windings is disposed upon the core about points where the horizontal and vertical deflection windings would ordinarily overlap. The auxiliary windings are then connected in series to form a closed, four-sided loop or bridge.
  • the bridge is connected in series with both the first and the second set of deflection windings such that the windings of the first set are coupled to opposing nodes of the bridge, and the windings of the second set are coupled to the other, remaining nodes.
  • the effective resistances across the newly-connected first and second sets of windings are substantially decreased while the inductances thereof are virtually unchanged so that the LR ratios thereof are substantially improved.
  • first and second sets of windings are distributed in patterns characterized by relatively low fifth-order and higher harmonics.
  • each auxiliary windings has turns of an additional adjacent auxiliary winding interposed intermediate its ends.
  • the present invention relates to electromagnetic devices and, more particularly to improved electromagnetic means for deflecting electron beams in a cathode ray tube.
  • L-R ratio increases the efficiency of deflection windings through reduced 1 R losses, which results in a substantially cooler-operating device.
  • the sensitivity of the device is also increased, resulting in better system performance. It will be appreciated that even when utilizing compensating means in circuit with the deflection windings, the inherent L-R ratio of the deflection yoke remains substantially unaffected. It will therefore be appreciated that it would be desirable to provide improved deflection means having better linearity characteristics and a superior L-R ratio than those previously known.
  • auxiliary windings upon a core assembly in conjunction with a first pair of windings which provide vertical deflection, and a second pair of windings which effect horizontal deflection, of an electron bearn.
  • Each of the four auxiliary windings is a hybird winding constituted by turns which correspond to what would otherwise be adjacent or overlapping turns of juxtaposed horizontal and vertical deflection windings.
  • Each of the four auxiliary windings is disposed about a point on a yoke between a horizontal and a vertical winding.
  • the four auxiliary windings are then connected in series to form a closed, four-sided loop which resembles a bridge.
  • Each of the vertical deflection windings is connected to an opposite corner of the bridge.
  • Each of the horizontal deflection windings is then coupled to one of the remaining, opposite corners or nodes of the bridge.
  • Currents flowing through both the horizontal and the vertical deflection windings thus traverse all four of the bridge-connected windings, re sulting in either additive or differential currents therein.
  • the bridge-connected windings interposed in the deflection circuits may serve to maintain the effective inductances thereof, while lowering the series resistance of each circuit so that the L-R ratios are markedly improved.
  • smaller wire may be used for the bridge windings. The increased resistance of the bridge windings may thus maintain the original L-R ratio, while affording a substantial saving in conductor material.
  • a yoke winding which utilizes bridge-wound turns in combination with vertical and horizontal windings which overlap certain of the bridge windings.
  • the distribution of the vertical and horizontal windings provides desirable beam deflection characteristics while facilitating the disposition of turns on the core in a continuous, progressive manner.
  • ones of the turns of each bridge winding are interchanged with corresponding turns of an adjacent bridge winding.
  • the interchanged turns produce additive magnetic flux for deflection current flowing in a first direction, and bucking magnetic flux for deflection current flowing in the opposite direction.
  • FIG. 1 is a schematic drawing of a set of horizontal and vertical deflection windings as utilized in the prior art
  • FIG. 2 is a sectional view of a toroidal coil and core assembly showing the disposition of various windings upon the core in accordance with the teachings of the prior art;
  • FIG. 3 is a schematic drawing of an improved deflection winding circuit constituting one embodiment of the present invention.
  • FIG. 4 is a cross-sectional diagram showing a developed quadrant of a toroidal yoke core having windings distributed therein;
  • FIG. 5 is a plot of the distribution of the effective horizontal deflection winding of FIG. 4;
  • FIG. 6 is a plot of the distribution of the effective vertical deflection winding of FIG. 4;
  • FIG. 7 is a cross-sectional diagram showing another turns placement scheme on a developed quadrant of a toroidal deflection yoke
  • FIG. 7a represents a portion of the developed quadrant of FIG. 7 showing a modified turn placement arrangement
  • FIG. 8 is a plot of the distribution of the effective horizontal deflection windings of FIG. 7 and 7a;
  • FIG. 9 is a plot of the distribution of the effective vertical deflection windings of FIG. 7 and 7a.
  • FIG. is a schematic diagram showing a modified bridge-connected deflection circuit.
  • FIG. 1 shows, in simplified schematic form, a set of windings suitable for deflecting the electron beam of a cathode ray tube over the viewing screen or face thereof.
  • a pair of vertical windings V, and V are connected in series and coupled across a source of signals (not shown) which apply a periodic ramp-like or "sawtooth" current 1,, to the windings.
  • windings V, and V are commonly disposed upon a magnetic core located adjacent the neck of a cathode ray tube.
  • Magnetic flux produced by current flowing through vertical windings V, and V is ordinarily oriented in a horizontal fashion in order to impart a vertical deflection to an electron beam passing therethrough.
  • horizontal windings H, and H are connected across another source of periodic signals (not shown) for causing a sawtooth current I, to flow therethrough.
  • Horizontal windings H, and H may advantageously be disposed upon a common core with vertical windings V, and V and displaced 90 therefrom in order to produce a vertical field for effecting the deflection of an electron beam in a substantially horizontal plane.
  • the junctions of the pairs of horizontal and vertical windings may advantageously be connected together. Current is applied to the horizontal windings by means of a balanced source, such as the secondary winding of a transformer across which the windings are coupled. Horizontal windings H, and H are thus allowed to float with respect to ground.
  • FIG. 2 there is shown a simplified cross section of a toroidal core 10 upon which vertical and horizontal deflection windings are disposed in a manner commonly practiced in the prior art.
  • Vertical windings V, and V are placed diametrically opposite one another on the upper and lower halves of core 10., respectively.
  • horizontal windings H, and H are disposed diametrically opposite one another upon the core and displaced substantially 90 from the vertical windings.
  • the overlapping or adjacent turns referred to may be treated as unitary winding elements rather than as separate but commingled horizontal and vertical winding turns. the overlapping or adjacent turns can therefore be electrically isolated and connected together so as to form a new, separate winding.
  • the interleaved or overlapping turns of windings V, and H are denominated W
  • the interleaved or overlapping turns of windings V, and H are denominated W
  • those of windings V, and H denominated W
  • the sets of turns denominated W,,, W,,, W and W are removed from the core and replaced with four auxiliary windings formed from a continuous length of conductor, a set of four series-connected windings result. After joining opposite ends of the conductor, the four windings may be considered to be in a bridge configuration.
  • FIG. 3 a schematic drawing of the newly-achieved winding system is shown.
  • the four new, auxiliary windings are series-connected to form a closed loop and depicted as lying in a substantially square configuration in the manner of a bridge.
  • the now-shortened deflection windings serve to connect the bridge windings across suitable sources of horizontal and vertical deflection currents.
  • One end of the now-shortened vertical deflection winding denominated V is coupled to one corner or node of the bridge at an intersection of two of the four new, auxiliary windings.
  • one end of the other attenuated vertical winding V is connected to a node at the opposite side of the bridge, at the intersection of the other two of the four new windings.
  • Each of the shortened horizontal deflection windings H, and H is connected to one of the remaining nodes of the bridge.
  • the bridge-connected auxiliary winding whose ends are coupled to vertical winding V, and
  • a total of four of the new or auxiliary windings are formed, and are connected in a closed loop or bridge. Now, by coupling opposite junctions or nodes formed between the bridge-connected windings in series with horizontal windings H and H a new circuit element composed of 4N turns connected in parallel with 4N turns is interposed in the horizontal deflection circuit.
  • magnetomotive force F is directly proportional to the ampere-turns of a winding it may be considered that the mmf of the horizontal deflection circuit F, is equal to the current 1,, through the circuit times the number of turns, or
  • Each of the horizontal windings of the inventive circuit has had 2N turns removed therefrom, and with the bridge windings connected between the shortened horizontal windings H and H there are two paralleled windings of 4N turns each added to the horizontal circuit.
  • horizontal deflection current 1 divides equally between both parallel branches of the bridge-connected windings, recombining at the opposite side of the bridge and flowing outwardly through the distal horizontal deflection winding
  • the mmf F,,' of the horizontal deflection circuit when connected as shown in FIG. 3 may be represented as v n g so that the mmf and therefore the inductance of the new horizontal circuit including the bridge-connected windings is substantially the same as that of the original deflection windings alone.
  • the spatial distri' bution of the mmf giving rise to the magnetic flux about the windings is substantially the same. It may easily be demonstrated that the above relationship also holds true for the new vertical deflection circuit shown in FIG. 3 so that the magnetic and inductive characteristics of the vertical deflection system are also unchanged. From the standpoint of the magnetic characteristics of the deflection system the total number of effective turns in the inventive horizontal deflection circuit is still 2X, and the total number of effective turns in the vertical circuit is still 2). Hence, the total inductance of both the horizontal and the vertical deflection circuits has not been changed.
  • the various bridge-connected auxiliary windings conduct differential currents whose characteristics depend upon the relative phase and magnitudes of vertical and horizontal deflection currents 1,, and l,,. Assuming current flow in the directions indicated in FIG. 3, it will be seen that currents 1,, and I, are additive in windings 8, and B and subtractive in windings B and B The change in ampere-turns thus achieved corresponds to the decrease in magnetic flux which would result from opposing current flows in the interspersed turns W and W which the windings B and B replace.
  • Damping means comprising capacitor 12 and resistor 13 are connected in series between the input terminals of vertical winding V, and horizontal winding H Similarly, the series combination of a capacitor 14 and resistor 15 are connected between the output terminals of vertical winding V and horizontal winding H,'.
  • the damping means serve to minimize ringing or oscillation which may be induced in the vertical deflection windings due to the presence of higher-frequency signals in the horizontal deflection windings.
  • the series R-C circuits are shown for purposes of illustration, the bridge winding arrangement shown being amenable to various other damping arrangements as required.
  • the size of the conductor used for the bridge-connected windings may be reduced.
  • a reduction in cross-sectional area of the conductor effects a corresponding increase in the resistance thereof, lowering the L-R ratio but saving conductor material.
  • Tifthe'fiV'turns'of wire per bridge winding are constructed of wire having onehalf the cross-sectional area of the wire used for winding's V V2, H1, and Hz.
  • the inductance of the resulting deflection circuits will be substantially the same as that of the original circuits; but since the resistivity of the bridge circuit is doubled the overall series resistance of the horizontal and vertical deflection circuits will match that of the original, prior-art yoke winding configuration.
  • FIG. 4 One winding distribution which is considered optimal for a toroidal yoke used in conjunction with color television receiver cathode ray tubes in which three electron beams disposed in a planar array are deflected over a maximum included angle of 70 is shown in FIG. 4.
  • This embodiment incorporates an economic advantage in that it may be constructed by continuous winding of conductor material about the core, while including an interleaving and overlapping of windings which provides the desired winding distribution.
  • FIG. 4 shows a composite winding distribution upon the developed surface of one quadrant of an annular core, which includes one half of horizontal winding H bridge winding B and one half of vertical winding V It is assumed that the turns are deposited on the core by winding from right to left, the start of each winding being denoted by S and the finish or final turn by F.
  • winding distributions on adjacent yoke quadrants being symmetrical, it will be understood that the major part of winding H, is disposed in a continuous fashion for approximately 22 slots on either side of a point denominated on the yoke core with a small, discontinuous group of turns displaced substantially four slots from either end thereof.
  • the bridgeconnected auxiliary windings B and B are oriented symmetrically about the 0 position and extend in a continuous manner on either side thereof for 35 slots, resuming after a hiatus of four slots and extending again for substantially 12 slots.
  • the vertical deflection windings V, and V are disposed about the 90 and 270 positions upon the core, respectively. They are distributed outwardly therefrom and so bracket the 0 position in a symmetrical fashion.
  • FIG. 4 shows the right-hand half of vertical winding V it being considered unnecessary to illustrate the entire winding due to its symmetrical nature.
  • the turns extend in a continuous fashion for approximately 14 slots about the 90 position, and then in three separate sets of eight, five, and four turns spaced outwardly from the ends of the central winding segment by substantially five, l5, and 26 slots respectively.
  • both the bridge-connected windings are disposed in both a first and a second tier, the bridge windings actually occupy only a single layer at any point upon the core surface.
  • both the vertical and the horizontal windings comprise single layers, each remaining in a single tier.
  • This winding configuration lends itself to ease of manufacture, since the various windings may be disposed upon a toroidal yoke by progressively winding in a common direction about the toroid, with no need of backing up" to deposit a second layer of windings.
  • Vertical windings V, and V are deposited first, and then the various bridge windings are formed on the core.
  • the horizontal windings H, and H are disposed in a second tier over the bridge windings and the vertical deflection windings.
  • winding distribution indicates the overall magnetic effect produced by a group of inter-related turns, rather than the discrete positioning of the turns thereof.
  • bridgeconnected winding turns are assigned a value one-half that of the turns within exclusively horizontal or vertical deflection windings. As explained above, it is considered that each bridge-connected winding conducts one-half of the horizontal deflection current and onehalf of the vertical deflection current.
  • FIG. 5 the effective winding distribution in the overall horizontal circuit of FIG. 4, including the bridge-connected windings appended thereto, is shown.
  • the vertical axis represents the precentage of the total turns extending from the geometric center of the winding to the distal end thereof.
  • the horizontal axis represents angular position on the yoke, it being recognized that the actual number of slots or turn positions varies with conductor size and the diameter of the core means.
  • the distribution of FIG. 5 thus may be used to characterize physically different windings which have similar magnetomotive characteristics, regardless of the actual number of turns or the diameter of the core means.
  • FIG. 6 represents the effective vertical deflection winding distribution from the geometric center to one extremity thereof, including bridge-connected winding B which lies in the illustrated yoke quadrant and contributes to the overall vertical winding distribution.
  • the winding distribution shown while illustrative of the actual turn placement set forth in FIG. 4, may be considered characteristic of the geometric winding type which produces the desired magnetic flux characteristic.
  • a two-dimensional configuration such as a waveform, or a spatial distribution such as the turns placement shown in FIG. 4, may be considered to be constituted by an infinite series of sinusoidal functions whose frequencies are integral multiples of a fundamental frequency. Where the frequency multiplier is greater than one, the function is termed a harmonic.
  • Such a series known as a Fourier series, may be represented in a form A sin 4; B sin (34 C sin (Sqb) D sin (7(1)) E Due to the symmetry of the present winding distribution even-numbered harmonics, i.e. those having evennumbered frequency multipliers, are not present.
  • the overall vertical deflection winding distribution which reflects the effectivevalue of the bridge windings, produces a Fourier series the coefficients of which have absolute values somewhat similar to those of the horizontal distribution.
  • the coefficients calculated for the vertical winding distribution of FIG. 4 are Cami-none;
  • the winding distribution thus characterized, in addition to facilitating the disposition of the various turns upon a core, produces magnetic fields well adapted for the deflection of electron beams in a color cathode ray tube of the type in which three electron beams are disposed in a planar array. It is contemplated that other, equivalent combinations of winding turn placements may be utilized to produce effective distribution shown.
  • a turns location arrangement utilizing bridgeconnected windings which is presently preferred for a toroidal yoke used in conjunction with a color cathode ray tube of a type in which three electron beams disposed in a triangular or delta array are deflected over a maximum included angle of 90 is shown in FIG. 7.
  • the symmetry of the toroidal winding allows the entire turns placement scheme to be characterized by one quadrant thereof.
  • the position on the developed core corresponds to the midpoint of the right-hand side of the idealized yoke represented in FIG. 2.
  • Horizontal deflection winding H is thus centered about the 0 position, while vertical deflection winding V, is centered about the 90 point.
  • FIGS. 8 and 9 show the cumulative percentage of the total effective turns from the center of each winding to the distal end thereof, including the associated bridgeconnected winding.
  • the solid curve of FIG. 8 represents the cumulative number of effective turns, assigning each turn of a bridge-connected winding one-half the value of a turn of the peculiarly horizontal winding.
  • the winding distribution shown in FIG. 8 therefore incorporates the effective turns of both one half of horizontal winding H and the bridgeconnected auxiliary winding B it being realized that the same bridge winding also contributes to the vertical winding distribution. It will be understood that the effective horizontal turns actually extend for somewhat less than 180 upon the yoke, the dotted portions of the curve which extend illustrating the characteristics of a modified winding distribution to be discussed below.
  • the present horizontal winding distribution may be characterized by a Fourier series of the form A sin 0 B sin (36) C sin (50) D sin (76) E sin ()+Fsin ()+G sin (I36)+. .Onanormalized scale, the coefficients calculated for the horizontal winding distribution of FIG. 7 are:
  • FIG. 9 is a plot of a preferred vertical winding distri bution.
  • the vertical axis represents the percentage of the total number of effective turns from the center of the winding to the outer end thereof, while the horizontal axis corresponds the developed length of a quadrant of the inner surface of an annular core upon which the windings are disposed.
  • turns of bridge windings associated with the vertical windings of interest are each assigned one-half the value of an exclusively vertical winding turn, since the vertical deflection current which is carried by the bridge windings is one-half that carried by the vertical deflection winding itself.'A Fourier analysis of the effective vertical winding distribution shows that, in contradistinction to the effective horizontal winding distribution of FIG.
  • the fifth harmonic coefficient (C) is not insignificant.
  • the distribution represented in FIG. 9 may therefore be approximated by a Fourier series of the type indicated above wherein the normalized coefficients are o-nmunw While the set of Fourier coefficients listed above describes the winding distribution to a high degree of accuracy, it has been found that a winding distribution reconstructed from the fundamental, third and fifth order harmonics substantially duplicates the desired effective distribution.
  • the described winding distribution has been found to have characteristics which are highly desirable for use in a toroidal yoke in conjunction with a color television cathode ray tube of the type wherein three electron beams disposed in a triangular or delta array are deflected through a maximum included angle of 90.
  • FIG. 10 there is shown still another form of bridge-connected winding, which produces different fluxes for similar horizontal and vertical currents applied thereto.
  • the various horizontal and vertical deflection windings are connected to opposing corners of other, auxiliary windings which in turn are connected in a bridge configuration.
  • certain turns of each bridge winding have been interchanged with corresponding turns from an adjacent winding.
  • Bridge winding B for instance, comprises a first segment P and a second segment p while bridge winding B which also receives current from horizontal winding H comprises first and second segments Q and q respectively.
  • Bridge winding B which is connected to horizontal winding H comprises a first segment S and a second segment 5 while the other bridge winding B connected to horizontal winding H comprises first and second segments T and 2, respectively.
  • first segments of each bridge winding contain like numbers of turns, as do all of the second segments so that the turns comprising the second segments of each bridge winding may be interchanged with those of an adjacent bridge winding.
  • the turns which comprise winding segment q are interchanged with those of segment p, and the turns of segment s are interchanged with those constituting segment t.
  • the direction of vertical deflection current I is indicated by solid arrows, and the direction of horizontal deflection current I, by dashed arrows.
  • the vertical deflection current 1 in first winding segment P of bridge winding B is directed in a manner similar to that of second winding segment q which is adjacent thereto.
  • horizontal deflection current I flows through the first winding segment P in a direction opposite to that through second winding segment q.
  • each bridge-connected winding may now be considered to consist of a first winding segment derived from the original winding and a second winding segment borrowed from its neighbor.
  • FIG. 7a there is shown a portion of the developed toroidal core quadrant represented in FIG. 7, with windings represented thereon in cross section.
  • FIG. 7a shows only ehe windings disposed at one side of the juncture of the two quadrants which form the upper half of a toroidal yoke of the type illustrated in FIG. 2, wherein the right-hand extremity is taken to be 0 and top dead center is The 90 position is located at the rightward end of the developed view shown in the Figure.
  • FIG. 7a shows only ehe windings disposed at one side of the juncture of the two quadrants which form the upper half of a toroidal yoke of the type illustrated in FIG. 2, wherein the right-hand extremity is taken to be 0 and top dead center is The 90 position is located at the rightward end of the developed view shown in the Figure.
  • bridge winding B begins at slot 60 (approximately 82) and is wound in a progressive clockwise fashion to slot 3 which is located at approximately 4 on the core, the initiation or starting point of the bridge winding being denominated S8 and the end or finish FB
  • Vertical winding V is disposed in a second tier over winding B for the first 42 of the bridge-connected winding.
  • the vertical windings are disposed in the unoccupied first tier between the 82 and 90 points or between the initial turn of bridge winding B to the final turn of bridge winding B
  • a single tier of vertical windings between 82 and 98? is inadequate.
  • seven additional vertical winding turns are disposed in a second tier in altemating positions. It will now be seen that there are a total of nine effective vertical turns lying in slots 67-72 of the second quadrant.
  • FIG. 7a shows in developed form the rightward end of the yoke quadrant shown in FIG. 7.
  • some of the vertical winding turns which had originally been disposed in slots 61-66 have been deleted and certain bridgeconnected winding turns have been added.
  • the turns placement and connection gives rise to an asymmetrical mmf contribution from the bridge windings to produce an effective winding distribution which is substantially identical to that of FIG. 7 for the vertical windings, and nearly so for the horizontal windings.
  • bridge windings as disclosed above necessarily carry both horizontal and vertical deflection current Therefore, in providing bridgeconnected winding turns of the type heretofore described it would be necessary to accept horizontal flux components over the length of the entire bridgeconnected winding. It would in some cases be detrimental to the deflection characteristics desired, however, if such horizontal components were to appear in the area about the 90 point of the yoke.
  • bridge winding B and B are each extended by a total of six turns to replace the first tier of vertical deflection windings lying in slots 61-66 and 67-72, respectively; and three vertical winding turns are added to the second winding tier. Since each bridge winding turn has only one half the effective value of a corresponding vertical winding turn, the six vertical turns and six bridge turns equalnine effective vertical turns, the same number as had originally been disposed in slots 60-66. Since the windings are symmetrically distributed about the 90 position, the effect is the same for turns of winding B in slots 67-72. The mere provision of bridge winding turns, however, will still support horizontal flux components, as set forth above.
  • the winding connection shown in FIG. is utilized.
  • the first turn of bridge winding B is placed in slot 72, the winding progressing in a clockwise fashion about the core, herein corresponding to a leftward direction.
  • a total of three turns of bridge winding B are interchanged with three turns of adjacent bridge winding B
  • turns of winding B lying in slots 61, 62, and 66 are removed, and the three turns thus eliminated are placed in slot 67, 71 and 72 and so are interspersed with turns of bridge winding B
  • the turns of bridge winding B thus displaced are now substituted for those deleted from winding B in slots 61, 62, and 66.
  • each bridge winding which buck those produced about the interchanged turns such that the interchanged turns effectively cancel the adjacent, original bridge windin turns to produce a subtractive effect and thus nullify the horizontal deflection flux in portions of the region illustrated.
  • turns of winding B which extend into the first quadrant symmetrically with segment q of winding B correspond to segment p of FIG. 10.
  • a total of 59' tur n s are provided in each of the vertical windings with 50 turns in each bridge winding.
  • the horizontal windings each have a total of 64 turns therein. It will be under stoo d thatthe induc mce L presented to the vertical deflection drive system is then due to 218 turns while the inductance L presented to the horizontal system is attributable to 228 turns
  • the resistance R of the overall vertical winding system is 2R (59 50/2) or 168 R ohms while the horizontal resistance R, is
  • the inductance of the aggregate effective vertical turns is due to 2(53 56) 218 turns while horizontal inductance is due to the presence of 2(64 53 3) 228 turns.
  • the illustrated modification in turns placement makes it possible to reduce the vertical deflection winding turns to a single layer so that the turns may be wound in a continuous, progressive manner without the need to back up to deposit a second layer of turns.
  • the effect of the modified turns placement shown in FIG. 7a may be seen in the plot of effective horizontal winding distribution of FIG. 3.
  • the terminal portion of the curve is shown in expanded form.
  • the dotted portion of the curve extending for the last 8 of the quadrant (here equivalent to six slots or turn positions) represents the effect of the additional bridgeconnected winding turns.
  • the percent of effective winding, measured from the center of the horizontal winding, decreases for slots 61-62, reflecting the presence of the turns interposed from bridge winding B
  • the percentage of total winding then increases for the following three slots due to the presence of the additional turns of bridge winding B in slots 63-65.
  • the distribution then decreases by one slot due to the presence of the oppositely-directed current in the final turn of the quadrant.
  • Means for effecting the periodic deflection of an electron beam within a cathode ray tube comprising:
  • core means adapted to be disposed about the neck of the cathode ray tube
  • first, second, third, and fourth windings disposed on said core means and connected in series relationship with one another to form a closed loop, said first and said second windings each having at least one turn disposed intermediate the ends of the other;
  • said third and said fourth windings each having at least one turn disposed intermediate the ends of the other;
  • a color television receiver including a cathode ray tube having electron gun means adapted to produce a plurality of electron beams, means for periodically deflecting the electron beams, comprising:
  • annular core means adapted to be disposed about the neck of the cathode ray tube
  • first, second, third, and fourth windings disposed on said core means connected in series relationship with one another to form a closed loop, each of said first, second, third, and fourth windings comprising a first and a second segment;
  • deflection apparatus for deflecting the electron beams of the cathode ray tube
  • said deflection apparatus including a core for receiving the neck portion of said cathode ray tube and horizontal and vertical windings wound on said core, wherein proper deflection of said electron beams requires sufiieient windings such that adjacent horizontal and vertical windings are ordinarily caused to overlap
  • the improvement comprising:
  • each of said auxiliary windings having turns proportional to the number of overlapped turns between adjacent horizontal and vertical windings
  • each auxiliary winding replacing the overlapped portion of each of adjacent horizontal and vertical windings such that shortened horizontal and vertical windings are utilized
  • auxiliary windings being serially interconnected to form a closed loop
  • one of said shortened horizontal windings being connected to the junction between the first and second auxiliary windings, the other of said shortened horizontal windings being connected to the junction between said third and fourth auxiliary windings, one of said shortened vertical windings being connected to the junction between said second and third auxiliary windings, the other of said shortened vertical windings being connected to the junction between said fourth and first auxiliary windings.
  • a television receiver deflection apparatus for deflecting the electron beams in the cathode ray tube comprising:
  • said horizontal windings connecting the junctions between said first and second and third and fourth auxiliary windings to a source of horizontal deflection signals to form a series connection between said horizontal windings, the source of horizontal signals and said auxiliary windings,
  • said vertical windings connecting the junctions between said second and third and fourth and first auxiliary windings to a source of vertical deflection signals to form a series connection between said vertical windings, the source of vertical signals and said auxiliary windings.
  • the first horizontal winding connecting the junction between said first and second auxiliary windings to the source of horizontal signals
  • the second horizontal winding connecting the junction between said third and fourth auxiliary windings to the source of horizontal signals
  • said vertical windings comprise first and secone windings
  • said horizontal windings and said auxiliary windings comprise a first set of windings disposed about a first pair of diametrically opposite points on said core and being arranged about each of said points to provide an effective winding distribution substantially characterized by sin 0.08 sin(3) where qb represents the angular displacement from the geometric center of the winding,
  • said vertical windings and said auxiliary windings comprise a second set of windings disposed about a second pair of diametrically opposite points on said core displaced substantially from the first points and being arranged about each of said second points to provide an effective winding distribution substantially characterized by Sind: 0.06 sin(3).
  • first pair of windings and said first, second, third and fourth windings comprise a first set of windings disposed about a first pair of diametrically opposite points on said core and being arranged about each of said points to provide an effective winding distribution of substantially sinusoidal form
  • said second pair of windings and said first, second, third and fourth windings comprise a second set of windings disposed about a second pair of diametrically opposite points on said core displaced substantially 90 from the first points and being arranged about each of said second points to provide an effective winding distribution substantially characterized by sin 0.04 sin(3) 0.016 sin(5) where 5 represents the angular displacement from the geometric center of the winding.

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US00211341A 1971-12-23 1971-12-23 Deflection yoke with bridge-connected windings Expired - Lifetime US3792305A (en)

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US (1) US3792305A (enExample)
JP (1) JPS4881421A (enExample)
BR (1) BR7209064D0 (enExample)
DE (1) DE2262577A1 (enExample)
FR (1) FR2164811A1 (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922626A (en) * 1974-11-07 1975-11-25 Gte Sylvania Inc Wide angle deflection yoke quadrupole windings
US4251728A (en) * 1979-07-30 1981-02-17 International Business Machines Corporation Compensated magnetic deflection coil for electron beam lithography system
GB2235818A (en) * 1989-07-31 1991-03-13 Matsushita Electronics Corp Deflection yoke for a cathode ray tube
US5192898A (en) * 1990-10-09 1993-03-09 Videocolor Deflection yoke with ringing suppression means
US6066913A (en) * 1996-12-30 2000-05-23 Orion Electric Company Method of arranging a conductive wire pattern of a film-type saddle deflection member for a CRT
US6172451B1 (en) * 1997-12-12 2001-01-09 Sony Corporation Deflection yoke with vertical pincushion distortion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB709827A (en) * 1951-09-11 1954-06-02 Standard Telephones Cables Ltd Improvements in or relating to deflection systems for cathode ray tubes
DE925002C (de) * 1953-03-14 1955-03-10 Telefunken Gmbh Ablenkspulenanordnung zur magnetischen Ablenkung des Elektronenstrahls in einer Kathodenstrahlroehre
US3688156A (en) * 1969-03-17 1972-08-29 Sony Corp Electron beam deflection system utilizing a yoke having a plurality of separate windings toroidally wound theron

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB709827A (en) * 1951-09-11 1954-06-02 Standard Telephones Cables Ltd Improvements in or relating to deflection systems for cathode ray tubes
DE925002C (de) * 1953-03-14 1955-03-10 Telefunken Gmbh Ablenkspulenanordnung zur magnetischen Ablenkung des Elektronenstrahls in einer Kathodenstrahlroehre
US3688156A (en) * 1969-03-17 1972-08-29 Sony Corp Electron beam deflection system utilizing a yoke having a plurality of separate windings toroidally wound theron

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922626A (en) * 1974-11-07 1975-11-25 Gte Sylvania Inc Wide angle deflection yoke quadrupole windings
US4251728A (en) * 1979-07-30 1981-02-17 International Business Machines Corporation Compensated magnetic deflection coil for electron beam lithography system
GB2235818A (en) * 1989-07-31 1991-03-13 Matsushita Electronics Corp Deflection yoke for a cathode ray tube
US5115170A (en) * 1989-07-31 1992-05-19 Matsushita Electronics Corporation Deflection yoke for use in color cathode ray tubes
GB2235818B (en) * 1989-07-31 1994-01-12 Matsushita Electronics Corp Deflection yoke for a cathode ray tube
USRE35183E (en) * 1989-07-31 1996-03-19 Matsushita Electronics Corporation Deflection yoke for use in color cathode ray tubes
US5192898A (en) * 1990-10-09 1993-03-09 Videocolor Deflection yoke with ringing suppression means
US6066913A (en) * 1996-12-30 2000-05-23 Orion Electric Company Method of arranging a conductive wire pattern of a film-type saddle deflection member for a CRT
US6172451B1 (en) * 1997-12-12 2001-01-09 Sony Corporation Deflection yoke with vertical pincushion distortion

Also Published As

Publication number Publication date
FR2164811A1 (enExample) 1973-08-03
DE2262577A1 (de) 1973-07-05
JPS4881421A (enExample) 1973-10-31
BR7209064D0 (pt) 1973-09-25

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