DE2262577A1 - Deflection yoke with windings in a bridge circuit - Google Patents

Description

Deflection yoke with windings in a bridge circuit

The invention relates to electromagnetic devices and in particular improved electromagnetic devices for deflecting electron beams in a cathode ray tube,

In order to create a screen image (screen display) on the screen of a cathode ray tube, it is necessary to have a device for deflecting an electron beam or several electron beams over the image area of the tube in a predeterminable manner Way to provide. Various means can be chosen to obtain this function and have been both electrostatic and electromagnetic means are used to achieve periodic beam deflection applied richly. In cathode ray tube systems for use in television receivers, however, predominantly

309827/0815

electromagnetic devices used.

A persistent problem for designers of deflection systems for television receivers has been non-linearity; the sawtooth-like Wave form which arises in the horizontal deflection winding as a result of the integration of the supplied square-wave voltages. Although an ideal inductor has a linear increase in current would result, the resistance inherent in practical inductor devices causes deterioration in performance of the deflection windings and causes the current rise to be non-linear.

An improved ratio of inductance to resistance or L-R ratio increases the efficiency and effectiveness of the

Deflection windings by reducing IR losses and this results in a device which operates considerably colder. The responsiveness of the device is also increased and this leads to better performance or better performance of the system. It can be seen that even when compensating means are used in the deflection winding circuit, the inherent LR ratio of the deflection yoke remains practically unaffected. From this it can be understood that it is desirable to have an improved deflector having better linearity characteristics and a wide range
the previously known facilities.

en arity characteristic and a far superior L-R ratio than

In summary, the foregoing objects are achieved in accordance with one aspect of the invention by providing a set of four auxiliary windings on a core assembly along with a first pair of windings which provide vertical deflection and a second pair of windings which deflect an electron beam horizontally. Any of the four auxiliary wicks? lungs is a "hybrid" winding formed from turns corresponding to the adjacent or overlapping turns of opposing horizontal and vertical deflection windings are. Each of the four auxiliary windings is arranged at a point on a yoke between a horizontal and a vertical winding. The four auxiliary windings are then in series

309827/0815

switched to obtain a closed four-sided loop, which is similar to 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 connected to one of the remaining opposing corners or nodes of the bridge tied together. Therefore, the currents flowing through both the horizontal and vertical deflection windings will flow therethrough all four windings of the bridge circuit and lead to either additive or subtractive currents there. The bridge circuit connected windings, which are inserted into the deflection circuits, can serve to reduce the effective inductance of these Maintain circuits while reducing the series resistance of each circuit so that the L-R ratios can be significantly improved. Alternatively, thinner wires can be used for the bridge windings. In this way the original L-R behavior can be maintained due to the increased resistance of the bridge windings, thereby creating a considerable savings in conductor material is given.

In another embodiment, a yoke winding is disclosed, which uses bridged windings in combination with vertical and horizontal windings, which determined Overlap the windings of the bridge. The distribution of the vertical and horizontal windings gives desirable properties for the beam deflection and at the same time promotes the accommodation of the individual turns on the core in a continuous progressive way.

In a further embodiment, there are each individual turns each bridge winding interchanged with corresponding turns of an adjacent bridge winding. The exchanged with each other Windings create additive magnetic flux for the deflection current to flow in a first direction and in opposite directions acting magnetic flux when the deflection current flows in the opposite direction.

Fig. 1 shows a schematic representation of a set of horizontal and vertical deflection coils, which so far '.

309827/0815

were used.

FIG. 2 is a section through a toroidal assembly of FIG Coil and core and shows the arrangement and position of various windings on the core according to the previously known To teach.

Figure 3 is a schematic representation of an improved circuit for the deflection winding as an embodiment of the invention.

Fig. 4 is a sectional view showing a development of a

Quadrant of a toroidal yoke core with the inside • distributed turns.

Fig. 5 is a distribution curve of the effective horizontal deflection winding according to Figure 4.

Fig. 6 is a distribution curve of the effective vertical deflection winding of Figure 4.

Fig. 7 shows a sectional view for another scheme of the arrangement of the turns with a development of the quadrant a toroidal deflection yoke.

7a shows part of the development of the quadrant of the figure with a modified arrangement of the windings.

Fig. 8 is a distribution curve of effective horizontal deflection windings of Figures 7 and 7a.

Fig. 9 is a distribution curve of the effective vertical deflection windings of Figures 7 and 7a.

Fig. 10 is a schematic representation of a modified deflection circuit with bridge circuit.

309827 / 081S

FIG. 1 shows, in simplified schematic form, a set of windings which are suitable for deflecting an electron beam from a cathode ray tube over the screen or the picture surface thereof. A pair of vertical windings V ₁ and V 2 are connected in series and coupled via a signal source (not shown), these signals supplying a periodic ramp or sawtooth current I to the windings. It will be understood by those skilled in the art that the windings V ₁ and V _{2 are} usually arranged together on a magnetic core which is arranged adjacent to the neck of a cathode ray tube. The current which flows through the vertical windings V ₁ and V ₂ generates a magnetic flux which is usually oriented horizontally in order to impart a vertical deflection to an electron beam penetrating this magnetic field. Similarly, horizontal windings H 1 and H _{2 are} connected across another source of periodic signals (not shown) to cause a sawtooth current I to flow through those windings. The horizontal windings IL · and H ₂ can advantageously be arranged with the vertical windings V- and V ₂ on a common core and at an angular distance of 90 ° from the latter in order to generate a vertical field for deflecting an electron beam in a substantially horizontal plane. The connection points of the pairs of horizontal and vertical windings can advantageously be connected to one another. The current is fed to the horizontal windings with the aid of a balanced source (push-pull output), for example through the secondary winding of a transformer via which the windings are coupled. The horizontal _{windings H 1} and H ₂ can therefore be "floating" with respect to earth or floating.

Figure 2 shows a simplified sectional view of a toroidal core 10 on the vertical and horizontal deflection coils in the ^- generally been commonly used ways are arranged. The vertical windings V ₁ and V ₃ . are mounted diametrically opposite one another on the upper and lower halves of the core 10, respectively. Similarly, the horizontal windings H ₁ and H ₂ are diametrically opposed and im

3098 27/0815

substantially offset by an angle of 90 with respect to the vertical windings on the core. FIG. 2 shows a measure often used for the structural design of such devices for accommodating the necessary number of individual turns of the vertical windings for a proper deflection of an electron beam. For this it was necessary to spread the turns of the horizontal windings H ₁ and H ₉ so that they overlap parts of the vertical windings V and V _2. In the idealized embodiment of Figure 2, this overlap creates two layers of windings at different points around the circumference of the core. In other cases, the desired magnetic operating characteristics can be achieved by adding nested turns of the windings in a single layer or layer, thereby increasing the effective lengths of the windings without the addition of a second overlapping layer of windings. In each case, however, the magnetic flux enclosed by two overlapping or adjacent turns is almost identical for different windings.

It has been found that these overlapping or adjacent turns can be viewed as unitary or unitary winding elements rather than viewing these turns as turns of intermingled horizontal and vertical windings. The overlapping or adjacent turns can therefore be electrically isolated and connected to one another to thereby form a new separate winding. In FIG. 2, the nested or overlapping turns of the windings V ^ and H _{2 are} denoted by the symbol W and the nested or overlapping turns of the windings V _? and H ₂ are denoted by W _b . Similarly, the nested or overlapping turns of windings V ₂ and H _{1 are} labeled W and the turns of windings V ₁ and H _{1 are} labeled W _d · If the sets labeled _{W a} , W _b , W _c and W _d of turns are removed from the core and replaced by four auxiliary windings, which are formed from a continuous piece of conductor, then this results in a

309827/0815

Set of four windings connected in series. After the connection At the opposite ends of the conductor, these four windings can be viewed as a bridge arrangement.

FIG. 3 shows a schematic representation of this new winding system obtained. The four new auxiliary windings are connected in series and form a closed loop. This is shown lying in the manner of a bridge as an essentially square shape. The now shortened deflection windings are used to connect the bridge windings via suitable sources for horizontal and vertical deflection currents. One end of the now shortened vertical deflection ^{winding is labeled V-, 1} and is coupled to a corner or a node point of the bridge at the intersection of two of the four new auxiliary windings. Similarly, one end of the other weakened vertical _{winding V 2} 'is connected to a node on the opposite side of the bridge at the intersection of the other two windings of these four new windings.

Each of the shortened horizontal deflection windings H ₁ ¹ and Hg * is connected to one of the other nodes of the bridge. The auxiliary winding connected in a bridge circuit, the ends of which are connected to the vertical winding V- ¹ and the horizontal winding H ₁ *, is denoted _{by B 11.} The winding which is coupled between the vertical winding V ₁ 'and the horizontal winding H ₁ ¹ is denoted _{by B 12.} Similarly, the bridge winding located between the windings V ₂ 'and H ₂ ¹ _{is labeled B 21} and the bridge winding between the windings V ₂ ' and IL ¹ is labeled B ₂₂ . All of the bridged windings are therefore in series with the vertical and horizontal deflection windings. Thus, each of the horizontal and vertical deflection windings has two parallel sets of windings in series, each set consisting of a pair of windings connected in series.

309827/0815

Below are the following sizes, based on the original Windings of the yoke, introduced:

X - number of turns in each of the original, horizontal turns H ₁ and H ,,

Y - number of turns in each of the original verticals

Windings V ₁ and V ₂

2Y - total number of vertical turns connected in series.

If N denotes the number of turns at the end of each winding, which are adjacent or overlapping turns of an adjacent winding, then result after removal of these Turns now have the following ratios for the yoke:

X - 2N turns for each new horizontal winding H ₁ ¹ and H "·

Y - 2N turns for each new vertical winding Vj * and V ₂ ¹ .

At each point at which overlapping or adjacent turns of different windings have been removed, a new one is created continuous winding is formed which has 2N turns. Since in this place N turns of each of the original windings are removed, the 2N turns of the new winding only replace the eliminated turns of the deflection winding.

A total of four new auxiliary windings are formed and they are connected together in a closed loop or bridge. By coupling opposing connection points or nodes, which are formed between the windings connected in a bridge circuit, in series with the horizontal windings H-, 'and H ₂ ¹ , a new circuit element is now inserted into the horizontal deflection circuit, which consists of 4N turns in parallel with 4N turns consists.

If the resistance multiplication factor is a constant R with of the dimension ohms per turn of the winding material is assumed, then one recognizes that the original horizontal

309827/0815

Steering windings had a resistance K. of 2RX and the original vertical windings had a resistance R ^ of 2RY _O composed of the resistance of the v-shortened deflection windings and the resistance present in the bridge windings. This results in the following relationships for the total resistance R ^ ^{8 of} the new horizontal deflection circuit

R (X-2N +. ^{- 1} + X-2N) ■

'1 / 4W + 3 / 4N

- R (X-2N + 2N + X> 2N)

■ or
2R (XN)

so that the Yfiderstand of the new horizontal deflection circuit is reduced by the size 2RN "Since furthermore the windings connected in the circuit now table the vertical deflection windings V ₁ 'and ¥""adds siffid _s it can be seen that the effective series resistance R ° der vertical deflection circuit now corresponds to the following description

R (Y-2M + ' ^x +. Y- 2E)

l / m + 1 / 4N -

- R (Y-? N + 2N4-Y-> 2N> -.. ■

or ^r

Dalier is the total resistance of the vertical has also been reduced by the

Although the resistance above the vertical «ad is also above the tsorlzontal Deflection circuit has been reduced, the remains

309827 / 08IS

Motor power of both circuits is the same. Since the magnetorotor Force F is directly proportional to the ampere-turns of a winding, the arrangement can be viewed as if the magnetomotive force F. of the horizontal deflection circuit is equal to the current I. through the circuit multiplied by the Number of turns is or equal

^F h - ^2I h ^X
for the original horizontal circuit,

On each horizontal winding of the arrangement according to the invention, 2N turns were removed. Since the bridge windings are connected between the shortened horizontal windings H, ¹ and H ₂ *, two parallel windings with 4N turns each have been added to the horizontal circuit. Assuming that the horizontal deflection current is divided I. uniformly parallel between both branches of the sale in a bridge circuit »-bound windings and joined at the opposite side of the bridge again and flows out again through the ulterior horizontal deflection winding may be the magnetomotive force F, 'the horizontal deflection circuit according to a ί

η. ■ j

Circuit arrangement according to FIG. 3 represented by the following relationship will:

I _h (X-2N) + I _h (4N) + I _h (4N) + I _h (X-2N)

'22
- I _h (X-2N + 2N + 2N + X-2N)

or

2I _h X

Hence the magnetomotive force and hence the inductance the new horizontal circuit, including the windings connected in a bridge circuit, is essentially the same size as in the original deflection windings alone. Furthermore, the spatial distribution of the magnetomotive force, which the

Magnetic flux generated around the windings , essentially the same as before. However, it can easily be shown that these above

309827 / 081S

Relationship also for the new vertical deflection circuit
Figure 3 applies, so that such the magnetic and inductive properties of the vertical deflection system are changed. From the
The standpoint of the magnetic properties of the deflection system is
the total number of effective turns in the inventive
horizontal deflection circuit still 2X and the total number
of the effective turns in the vertical circuit
still 2Y. Hence the total inductance of the horizontal and
the vertical deflection circuit has not been changed. It can be seen from this that using the same amount of conductor material as in a yoke winding according to the prior art
Technique the LR ratio of the horizontal deflection circuit
100 · n / X - N% has been increased and the LR ratio for
the vertical deflection circuit has been increased by 100. · N / Y - N%.

The various auxiliary windings connected in a bridge circuit conduct differential currents, "their" characteristics "or ". Properties depend on the relative phase and amplitude of the vertical and horizontal deflection currents I and I,. Un-.

vh,

assuming a current flow in the directions according to; Marking in Figure 3 it can be seen that the currents I, and; I _v in windings B ^ ₂ and B _? - are additive and the _Wick-: payments B ₁ - and B are ₂₂ subtractive. The thus _obtained: changing the ampere corresponds to that Verminde- '.- tion of the magnetic flux ", which is composed of opposite fließen- * the currents in the nested convolutions W and W; would result in that through the coils B ₁₁ and B ₂₂ replaced
will. Similarly, the increase in the number of ampere-turns due to the additive currents through the turns corresponds
B ₁₂ and B ₂₁ the increased flux which would result from the supply of the individual deflection currents to the separate nested horizontal and vertical windings W and W at corresponding points on the yoke, _ \

In series between the input terminals of the vertical winding
V ₁ ¹ and the horizontal winding H _? 'are damping devices, consisting of a capacitor 12 and a resistor 13,

309827/0815

switches. Similarly, the series connection of a capacitor 14 and a resistor 15 is connected between the output terminals of the vertical winding V ₂ 'and the horizontal winding H-'. The attenuators serve to minimize any ringing or vibration that may be induced in the vertical deflection windings due to the presence of high frequency signals in the horizontal deflection windings. Of course, another circuit can also be adapted for this purpose and the RC series circuits shown are for illustration purposes only. The bridge winding arrangement shown can, if necessary, be equipped with a wide variety of other damping devices.

Alternatively, instead of increasing the LRi ratios of the corresponding deflection circuits, the size of the conductor used for the windings connected in the bridge circuit can be reduced. A reduction in the conductor cross-section causes a corresponding increase in its resistance. This reduces the LR ratio; however, conductor material is saved. For example, if the 2N wire turns per bridge winding are made from a wire that has only half the cross-section of the wire used for windings V ₁ ¹ , V ₀ ¹ , H ₁ ¹ and H ₀ ¹ , then the inductance of the resulting deflection circuits be essentially the same size as the original circuits. However, since the resistance of the bridge circuit is doubled, the total series resistance of the horizontal and vertical deflection circuits becomes the same

'«III.

be as large as the original previously known design of the yoke winding.

It can thus be seen that it is advantageous to use as many bridged turns as is possible in a given design of deflection system . In an extreme case, it may be desirable to use only bridge connected windings and thereby

3 0 9827/0815

to reduce the number of individual horizontal and vertical winding turns to zero. In general, however, prohibit the necessary turn distributions the application of this Solution; sweges. ,

Figure 4 shows a winding '^ distribution, which for a toroidal; shaped yoke is considered optimal, which is used in connection with the cathode ray tubes of a color television receiver is, in which three electron beams are accommodated in a planar arrangement and over a maximum in-r can be deflected at a closed angle of 70 °. This embodiment gives an economic advantage in that it is through continuous winding of a conductor material on the core can be produced and at the same time nested and overlap of windings which contains the desired. Supply winding distribution.

Figure 4 shows a composite winding distribution on the; developed surface of a quadrant of an annular core, which contains one half of the horizontal winding H ₁ ', the j bridge winding B ₉₁ and one half of the vertical winding V ₁ ' ί. It is assumed that the turns on the

Core are applied by winding from the right to the left, WO \ and the end or the end coil are denoted by the letter F at the beginning of each winding by the letter S. !

Since the winding distributions on adjacent quadrants of the yoke are symmetrical, it can be seen from this that the main part of the winding H ^ ^{1 is arranged} in a continuous manner on about 22 slots "" on both sides of a point on the yoke core, which is denoted by 0 °, where a discontinuous group ■

of turns substantially around four grooves from each end of the- | same is offset. In a similar way, the auxiliary windings B ₀₁ and B _oo connected in the bridge circuit are symmetrical around the!

1 position O and extend in a continuous manner on both sides of the same over 35 grooves, then a gap of four grooves follows and then they extend essentially over a further 12 grooves.

309827/0815

The vertical deflection windings ν., ¹ and V _? * are arranged on the core around the spaces for 90 ° and 270 °. They are distributed starting from these points and therefore surround position 0 in a symmetrical manner. Figure 4 shows the right half of the vertical winding V ₁ *. Due to the symmetrical structure, it is not necessary to show the entire winding. The turns run in a continuous manner for about 14 slots around the position 90 ° and then in three separate sets of 8, 5 and 4 turns, which, starting from the ends of the central winding segment, are spaced essentially 5, 1.5 and 26 slots apart.

It can be seen that while the bridge windings are arranged in first and second layers, the bridge windings actually occupy only a single layer at any point on the surface of the core. Similarly, both the vertical and horizontal windings comprise simple layers and stay in, respectively

; a single location. This winding structure facilitates the manufacture, since the various windings are disposed on a yoke toroidf örmigen by progressively winding in a common direction around the toroid around without it being necessary for this purpose to return, in order to apply a second layer of windings. The vertical windings V .. ^f and Vp ¹ are applied first and then the various bridge windings are applied

j the core formed. Finally, the horizontal windings H- 'and H ₅ , ¹ "are then applied in a second layer over the bridge windings and the vertical deflection windings.

Of course, the possibility of arranging and accommodating the windings on a core is secondary to the correct distribution of the turns of the deflection winding. In this specification the term "winding distribution" means the overall magnetic effect produced by a group of interrelated windings rather than the individual position of the windings. When calculating the effective turn distribution, the turns of the winding connected in the bridge circuit are assigned a value which is half as large as for the turns in the exclusively horizontal or

309827/081 5

^ steer

vertical developments. As explained above, the arrangement considered that each bridge connected winding has one half of the horizontal deflection current and one half of the vertical deflection current conducts. ,

Figure 5 shows the effective winding distribution in the horizontal Overall circuit according to FIG. 4 including the attached windings connected in a bridge circuit., The vertical axis represents the percentage of the total number of turns which is furthest from the geometric center of the winding to the one outboard end thereof extends. The horizontal axis represents the angular position on the yoke. that the actual number of grooves or the winding layers is related to the conductor dimension and the diameter of the core device changes. The distribution according to FIG. 5 can therefore be used to determine its spatial or physical structure different windings to identify which similar magnetomotive Have characteristic curves, regardless of the actual number of turns or the diameter of the core direction.

Similarly, Figure 6 illustrates the effective vertical deflection winding distribution represent from the geometric center 'of the same to one end including one in a bridge circuit connected winding B «., which in the illustrated quadrant of the yoke and contributes to the total vertical winding distribution supplies. As already explained above, the winding distribution shown is used to represent the actual used placement of the turns according to Figure 4; however, it can be regarded as characteristic of the geometric winding type which has the desired characteristic or the Supplies curve for the magnetic flux.

Those skilled in the art will recognize that a two-dimensional spatial Design, such as a wave shape or a spatial distribution, such as the winding arrangement according to FIG. 4, viewed in this way can be as if it were one of an infinite series of

309827 / 081S

Sine functions built up, the frequencies of which are integral multiples are of a fundamental frequency. When the frequency multiplier is greater than 1, the function is said to be a harmonic function. Such a series, also known as a Fourier series, can be represented in the following form;

A sin 0 + B sin (30) + C sin (50) 4 D sin (70) + E sin (90) + F sin (110) + G sin (130) + .....

As a result of the symmetry relationship of the present winding distribution, there are even-numbered harmonics, i.e. harmonics with even-numbered ones Frequency multiplication factors not available. A Fourier analysis of the total horizontal deflection winding distribution including the turns of the bridge winding, those half the value ascribed to the turns of the horizontal winding reveals that the coefficient of the third Harmonic (B) is much larger than the coefficient of others Higher order harmonics. On a normalized or unitary scale, where the coefficient A of the fundamental frequency as a unit is determined, the following calculated coefficients result for the winding distribution

B. 0.0818 C. 0.0055 D. -0.0059 E. -0.0078 F. -0.0034 G -0.0061

The proportion of harmonics above the third order is therefore relatively small. The analysis shows that the contribution of the fifth and higher order terms is relatively insignificant and therefore the winding distribution shown in Figure 5 can essentially be reconstructed by combining a normalized fundamental frequency and the value given above for the third harmonic.

309827/081 5

The total vertical deflection winding distribution, which is the effective Represents the value of the bridge windings, generates a Fourier series, whose coefficients have absolute values that lead to a certain Degrees are similar to the values for the horizontal distribution, on a normalized scale the following result for the vertical winding distribution according to figure 5 calculated coefficients:

B. -0.0646 C. 0.0001 D. -0.0050 E. -0.0011 F. 0.0027 G 0.0078

Here, too, the third harmonic is much larger than the others Higher order harmonics. In this case, therefore, the analysis has also shown that the effective distribution according to the Figure 6 can be essentially reconstructed using the fundamental frequency and the third harmonic.

The winding distribution identified in this way generates not only the promotion of the arrangement of the various windings magnetic fields on a core which are very well adapted for the deflection of electron beams in a color cathode ray tube of the type in which three electron beams are arranged in one plane are. However, other equivalent combinations of housing the turns of the winding can also be used to produce the effective distribution shown.

Referring to Figure 7, there is shown a winding placement using bridged windings which is preferred for a toroidal yoke used in conjunction with a color cathode ray tube of the type in which three electron beams are mounted ^{in a triangular or delta configuration: and above} 'he has a maximum included angle

309827/08 1 5

be deflected by 90 °. As in the case of the arrangement according to FIG. 1, the symmetry of the toroidal winding allows the entire scheme for the spatial arrangement of the windings to be characterized in the form of a single quadrant. As before, the 0 ° position on the handling of the core corresponds to the midpoint of the right side of the idealized yoke according to FIG 2. Therefore, the horizontal deflection H 'based on this point is 0 ° as a center, and the center position for the vertical deflection winding V ₁ 'is given by the point 90 °.

Figures 8 and 9 show the cumulative or summed fraction of the total effective turns from the center of each winding to the outer end thereof including the associated bridged winding. The solid curve according to FIG. 8 represents the summation of the number of effective turns. Each turn of a winding connected in a bridge circuit is assigned half the value of one turn of the specific horizontal winding. The winding distribution shown in FIG. 8 therefore contains the effective number of turns of one half of the horizontal winding H- ¹ and the auxiliary winding B ₂₁ connected in a bridge circuit. It should be noted that the same bridge winding also contributes to the vertical winding distribution. It should also be noted that the effective horizontal turns actually extend around an area of the yoke of slightly less than 180 °. The dashed portions of the curve illustrate the characteristic of the modified winding distribution discussed below.

Just like in the case of the distribution of wraps with accommodation of the turns according to FIG. 4, this present horizontal winding distribution can be characterized by a Fourier series according to the equation:

A sin θ + B sin (3Θ) + C sin (5Θ) + D sin (7Θ) - * 'E sin (9Θ) + F sin (11Θ) + G sin (13Θ) + .....

309827/0815

On a normalized scale, the following are calculated Coefficients for the horizontal winding distribution according to FIG. 7

B. -0.0059 C. -0.0006 D. -0.0004 E. 0.0028 F. T-0.0064 G 0.0007

All harmonic components are therefore very small, based on the fundamental frequency. It can be shown that the effective horizontal The winding distribution according to FIG. 8 can essentially be reconstructed using the fundamental frequency alone, i.e., using a distribution substantially equivalent to a sinusoidal distribution.

Figure 9 is a graph for a preferred vertical winding distribution. In Figure 9, the vertical axis represents the proportion of Total number of effective turns from the center of the winding to the outer end thereof and the horizontal axis corresponds to the developed length of a quadrant of the inner surface an annular core on which the windings are arranged are. As already explained in connection with FIG. 8, the turns of the bridge windings, which are the here in question next vertical windings are assigned, each assigned a coefficient that is half as large as for one turn, which only belongs to one vertical winding. The reason for that is that the one taken over by the bridge windings vertical deflection current is only half that from the vertical deflection winding adopted deflection current. Although the above set of Fourier coefficients use the winding distribution describes a high degree of accuracy, it was found that one reconstructed from the fundamental frequency and the third and fifth harmonics Winding distribution essentially a duplication

309827/0815

of the desired effective distribution. Bs was found! that the winding distribution described has characteristics.] which are highly desirable for use in a toroidal-shaped yoke in connection with a cathode ray tube for color television, of the type in which three electron beams in a triangular or delta arrangement are attached and a maximum included angle of 90 ° be distracted.

FIG. 10 shows a further form of a winding connected in a bridge circuit, which generates different magnetic fluxes when similar horizontal and vertical currents are supplied. As before, the various horizontal and vertical deflection windings are connected to opposite corners of other auxiliary windings, which in turn are connected in a bridge circuit or bridge arrangement. In FIG. 10, however, certain turns of each bridge winding have been interchanged with corresponding turns of an adjacent winding. For example, the bridge winding B ₁₁ falls over a first segment or a first section P and a second segment ρ while the bridge _{winding B 21} , which also receives current from the horizontal winding H ₁ *, comprises a first and second segment Q and q, respectively. The bridge _{winding B 12} is connected to the horizontal winding H ₂ * and comprises a first segment S and a second segment β and the other bridge winding Boot, which is connected to the horizontal winding H « ^f , comprises a first and second segment T or respectively . t. For illustration, it is assumed, so that the turns of which the second segments \ form each winding bridge with which an adjacent bridge winding can be exchanged that all first segments of each bridge winding equal numbers of turns included, as well as all the second segments. Those turns which comprise the winding segment q are exchanged with those of the segment ρ and the turns of the segment β are exchanged with those which form the segment t. By _RICH: term connection of the exchanged winding segments, a circuit is obtained as 'is ..' shown schematically in Figure IO ^ ";:; - ■ ■ ■ · ..." ·

309827/0815

The direction of the vertical deflection current I is indicated by solid lines; Arrows indicated and the direction of the horizontal deflection stream; I, by dashed arrows. Assuming that all windings of all windings connected in the bridge circuit are wound on the core in a common direction, it follows that adjacent winding segments which carry a current running in the same direction also generate a magnetic flux running in the same direction. Similarly, winding segments in which the current flows in opposite directions also generate oppositely directed magnetic fluxes. For example, the vertical deflection current I in the first winding segment P of the bridge winding B _{11 is directed} in a manner similar to the current in the second winding segment q adjacent thereto. The horizontal deflection current I., the direction of which is indicated by the dashed arrows, however, flows through the first winding segment P in a direction opposite to its direction through the second winding segment q.

The magnetic one carried by the various bridge windings Flux is increased by additive currents in the first and second parts of the same, and decreased by subtractive or differeh- tial currents. In the present case, the vertical deflection properties and thus the effective vertical winding distribution remain unchanged txttz of the changed spatial design of the Bridge winding. In contrast to this, the horizontal winding distribution and therefore the deflection properties resulting therefrom are considerably modified. Each ver * bound winding can now be considered as if it existed from a first winding segment that is from the original Winding is derived and from a second winding segment that has been taken or borrowed from the next winding " Therefore, if in each of the second winding segments p, q, s and t; There are a number of Sn turns and a number of 2N Turns in each of the original bridge-connected auxiliary windings, so comprise the first winding segments in each case a number of 2 (N-n) turns »where one is flowing vertical current of 1 ^ / 2 in any of the bridges

909827/0816

- 22 - 2262677

The generated magnetomotive force I · N. On the other hand, the magnetic flux generated by the horizontal current 1/2 will be of the magnitude I _h (N-2n). Therefore, the inductance presented to the vertical deflection system will remain unchanged and, on the other hand, the inductance presented to the horizontal deflection system will be reduced. Therefore, the winding configuration shown in Figure to results in a modified distribution for one of the deflection winding circuits at the cost of a somewhat reduced LR ratio.

FIG. 7a shows part of the developed quadrant of the toroidal core of FIG. 7, the windings there being shown in section. FIG. 7a shows only those windings which are arranged on one side of the junction of the two quadrants which form the upper half of a toroidal yoke of the type according to FIG. The space for 0 ° is taken as the right end and the point for 90 ° as the upper center. The position 90 ° is arranged at the right end of the development view according to the figure. In the distribution according to FIG. 7, the bridge winding B ₃₁ begins at the slot 60 (at about 82 °) and is wound progressively clockwise to slot no. 3, which is located on the core at about 4 °. The starting point of the bridge winding is designated with SB ₂₁ and this is found with ₁ . The vertical winding V ₁ 'is in a second layer over

_{31 1}

of winding B ₂₁ for the first 42 ° of the winding connected in BrückeneehaItuilg. The vertical windings Sinti are attached between the points 82 ° and 90 ° in the unoccupied first position or in other words between the initial _{winding of the bridge winding B 31} up to the binding winding of the bridge winding B ₁₁ . However, in order to generate the necessary winding distribution, a single layer of vertical windings between the angular positions 82 ° and 98 ° (the slots 61 to 72) is not sufficient * For this reason, seven additional turns of the vertical winding are alternating or alternating in a second layer Housed in the layers, Bs can now be seen that there are a total of nine effective vertical turns, which lie in the grooves 67 to 72 of the second quadrant.

09Ö27 / 0S18

Figure 7a shows in developed form the right end of the yoke \. quadrants according to FIG. 7. In order to optimize the use of the bridge windings and to increase the LR ratio of the vertical windings, some of the windings of the vertical winding originally accommodated in the slots 61 to 66 have been removed and certain windings have been added to the winding with the bridge circuit. The position of the windings and their electrical connection result in an asymmetrical contribution to the magnetomotive force from the bridge windings and an effective winding distribution is thereby produced which is essentially identical to the distribution of FIG. 7 for the vertical windings and approximately the same as the distribution for the horizontal windings .

It will be recalled that the bridge windings as disclosed above are necessarily both horizontal as well as a vertical deflection current. Therefore, when introducing the above-described windings with a bridge circuit, it would be necessary to pass horizontal components of the magnetic flux over the Add the length of the entire winding connected in a bridge circuit. In some cases, however, this would be a disadvantage in terms of the deflection properties desired if such horizontal components appeared in the area around the 90 ° point of Joeh.

The distribution of the turns of the bridged windings according to FIG. 7a provides the advantages inherent in the bridge structure of the winding for the vertical deflection circuit without introducing an undesired magnetic flux resulting from the horizontal deflection signals. In the figure 7a, the bridge windings Bn ₁ and Bj are ₁ respectively extended by 6 turns in total, to replace the first layer of the verti- cal ■ deflection windings, which in the grooves 61 to 66: and is 67 to 72. Furthermore, three turns of the vertical winding are added to the second winding layer I. Dft every twist! the bridge winding has only half the effective coefficient of a corresponding turn of a vertical winding, ate gives six vertical turns and the six bridge turns the s

same result as nine effective vertical turns, i.e. the

30 9 8 277 0815

same number of turns as originally accommodated in grooves 60 to 66. Since the windings are symmetrically distributed around the square 90 °, the effect is the same for the turns of the windings B ₁₁ in the slots 67 to 72. However, as already stated above, horizontal components of the flux are still generated, if only Windings of the bridge winding are provided.

In order to cancel the effect of the horizontal current in certain turns of the bridge winding, the turn connection according to FIG. 10 is used. The first turn of each bridge winding B ₂₁ is accommodated in the slot 72 and the winding process proceeds clockwise around the core, which in this case corresponds to a direction to the left. A total of three turns of the bridge winding B _{21 are} exchanged with three turns of the adjacent bridge winding B ₁₁ . In the present illustrative representation, the turns of winding B ₂₁ 'which lie in slots 61, 62 and 66 are removed and the three turns thus removed are placed in slots 67, 71 and 72 and thus interleaved with turns the bridge winding B ₁₁ . The turns of the bridge winding B ₁₁ displaced in this way are now substituted in exchange for the _{turns removed from the winding B-1} in the slots 61, 62 and 66. Although the bridge windings shown are wound in a common direction, the exchanged windings carry a horizontal deflection current which flows in opposite directions.If a vertical deflection current is supplied to the bridge windings, then additive magnetic fluxes are generated in the same way as if the turns of the windings would never have been exchanged. Therefore, the effective vertical winding distribution remains unchanged in this way.

However, for the horizontal deflection current, each bridge winding Magnetic fluxes generated, which are counteracting the magnetic fluxes generated around the exchanged windings will. Therefore, the exchanged turns effectively cancel the neighboring original bridge turns to generate

309827/0815

a subtractive effect and thus make the horizontal deflection flow to zero in parts of the area shown. The turns of the winding Bp _1, which extend in the second quadrant in and alternately to turns of the coil B ₁ ^ are attached, corresponding to the second coil segment q of FIG 10. Similarly, corresponding to the turns of the coil B _11, which is in the first quadrant symmetrically to the segment q of the winding B ₂₁ , the segment ρ of FIG. 10.

In the example shown in FIG. 7, a total of 59 turns are provided in each of the vertical windings and there are 50 turns in each bridge winding. The horizontal windings each have a total of 64 turns. It is therefore understandable that for the supply system Inductance L presented for vertical deflection is due to 2 (59 + 50) or 218 turns.

On the other hand, the inductance L _h presented to the horizontal system can be traced back to 2 (64 + 50) or 228 turns. The resistance R of the entire vertical winding system is 2R (59 + 50/2) or 168 R ohms.

On the other hand, the horizontal © resistor is 2R ₁ (64 + 50/2) or 178 R ohms.

For the improved circuit according to FIG. 7a, the inductance is of the total of the effective vertical turns attributed to 2 (53 + 56) - 218 turns.

The horizontal inductance is due to its presence 2 (64 + 53 - 3) - 228 turns.

Although the inductance of the horizontal and the vertical effective If the winding distribution is essentially the same, the presence of additional turns of the bridge circuit is reduced connected winding the resistance of the entire vertical. Winding system on 2R (53 +56/2) or 162 R Ohm.

309827/0 815

The resistance of the horizontal system is now 2R (64 + 56/2) or 184 R ohms.

The illustrated modification of the position of the turns makes it possible to to reduce the turns of the vertical deflection winding to a single layer so that the turns can be wound in a continuous progressive manner without the Need to go back to apply a second layer of turns.

The effect of the modified arrangement of the turns according to FIG. 7a can be seen from the curve of the effective horizontal winding distribution according to FIG. 8. For the sake of clarity, the connection part of the curve is shown in an expanded or enlarged form. The dashed part of the curve, which extends over the last 8 ° of the quadrant (this is equivalent to 6 slots or winding spaces) represents the effect of the additional turns for the winding connected in the bridge circuit. The percentage, based on the effective winding and measured from the center of the horizontal winding, becomes longer for the slots 61, 62 and this reflects the presence of the windings which were inserted from the bridge winding. Then increases for the following three slots due to the presence of additional turns of the bridge winding B ″, in the slots 63 to 65 the percentage based on the total winding. The distribution then decreases by one notch due to the presence of the oppositely directed current in the last turn of the quadrant. The three additional turns of the bridge winding B ₂₁ have therefore been canceled out by the presence of the three oppositely wound turns taken from winding B * .. so that the total percentage of the windings starting from the center is not affected. As described above, nine effective turns are also present in the slots 61 to 66 for the vertical effective winding distribution, so that there is no detectable change in the effective vertical winding distribution, which is plotted as a curve in FIG.

309827/0815

From the above description it can be seen that certain Aspects of the invention are not limited to the specific details of the illustrated examples and can therefore be used without further other modifications or applications by those skilled in the art to be introduced. For example, the number of turns in a given bridge winding is not necessarily even The number and grouping of the nested turns of adjacent bridge windings can be changed to to meet a specific application.

309827/0815

Claims (1)

Claims 1J deflection device for deflecting an electron beam inside a cathode ray tube, characterized in that it comprises: a core (10), first, second, third and fourth windings (B ₁₁ , B ₁₂ , B _{31) arranged on the core (10)} , B ₂₂ ), which are connected in series to form a closed loop, a device for applying a first signal via the cutting tunnels or intermediate connection points of these first and second and third and fourth windings to generate a magnetic field to deflect the electron beam in one direction perpendicular to a given plane and means for applying a second signal across the interleaving points of the second and third and fourth and first windings to produce a different magnetic field for deflecting the electron beam in a direction substantially parallel to the given plane. 2. Deflector according to claim 1, characterized in that two of the windings are on the core (10) arranged symmetrically with the other two windings s in d. 3. deflection device according to claim 2, characterized in that that the core (10) is designed essentially in the shape of a circular ring. 4. deflection device according to claim 1, characterized in that the core (10) has substantially the shape of a circular ring, the first signaling _{device comprises a first pair of windings (H 1} ¹ , H ₂ ¹ ), the diametrically opposed points on the Core device are attached, the second signal _{device comprises a second pair of windings (V 1} ', V ₂ ') which are arranged around diametrically opposite points on the core device and the second points substantially at 90 ° on the core (10) opposite the first points are offset. 309827/08 15 5. deflection device according to claim 4, characterized in that one end of each of the first pair of windings (IL ', H') at alternating interfaces between windings from these four windings (B ₁₁ » ^B i2 ' ^B 21' ^B 22 ^ are coupled and one end of the second pair of windings (V. '. Vn ¹ ) are coupled to the other, alternating interfaces between the four windings. 6. deflection device according to claim 1, characterized in that that the cathode ray tube is a color television tube and an electron gun device possesses, which is set up to generate three electron beams which are arranged in a plane, with devices intended for the periodic deflection of the electron beams over a maximum included angle of about 70 ° and comprise: a first signaling device in the form . of windings which are arranged around a first pair of diametrically opposed points on the core and are each arranged around this first pair of points in a distribution which is characterized by a Fourier series which essentially has the form.sin 0 + 0.08 sin (30), where 0 represents the angular displacement with respect to the geometric center point of the winding, and second signaling devices are provided in the form of windings which are arranged around a second pair of diametrically opposed points on the core (10) which are substantially at 90 ° are offset from the first points and are arranged in a distribution around each of the points of this pair of points which is characterized by a Fourier series Bt which is essentially of the form sin 0-0.06 sin (3 0). 309827/0815 Deflection device according to Claim 6, characterized in that the first signal _{device comprises a first pair of windings (H 1} ', H « ¹ ) which are adapted to deflect the electron beams in a horizontal direction, the second signal device a second pair of windings (V ₁ ', V "'), which are adapted to deflect the electron beams in a vertical direction, the four windings (B ^, B-« » ^B oi» ^B 22 ^ are connected ^{in a} bridge circuit, with a first pair of opposite corners of the bridge are coupled in series with the first signals in the direction and the remaining pair of opposite corners of the bridge are coupled in series with the second signal means. 8. deflection device according to claim 7, characterized in that that the first pair of windings each comprises a second layer of turns in a first layer are attached to the core. 9. deflection device according to claim 8, characterized in that that the second pair of windings each comprises a single layer of turns in one second layer are arranged on the core. ' 10. deflection device according to claim 9, characterized in that that the four windings connected in a bridge circuit each have a single layer of turns which are arranged in first and second layers on the core. 11. deflection device according to claim 10, characterized in that the turns of the four in a bridge circuit connected windings lie in a second layer and coexist over a common part of the core with Turns of the first pair of windings are attached and in a first layer over a common part of the core are arranged with turns of the second pair of windings, 309827/0815