KR800000937B1 - Deflection yoke with non-radial conductors - Google Patents

Abstract

A deflection yoke includes a core having front and rear grooved end caps for securing conductor turns at the front and rear of the yoke. A third set of conductor grooves is disposed on the inside of the core at a position between the front and rear end caps for securing conductor turns at that position for forming precision-disposed non-radial active turns. The coils formed by the conductor turns maybe toroidals or saddle, depending on the return conductor disposition.

Description

Deflection yoke with non-radial winding

1 is a partial cross-sectional view of a television imaging tube and deflection yoke according to the present invention.

2 is a front view of the deflection yoke shown in FIG.

3 is a perspective view of the deflection yoke shown in FIGS. 1 and 2;

4 is a perspective view of a conical deflection yoke according to the invention.

5 is a winding distribution obtainable as a deflection yoke according to the present invention.

The present invention relates to a precise deflection yoke having windings arranged non-radially with respect to the central longitudinal axis of the yoke.

It can be seen that the composite beam color television cinemas have a wider deflection angle, so that the effect of the nonclinical deflection yoke and raster's tune is greater. This situation arises due to the in-line and dela forms of the electron gun structure in the image tube. The characteristics of the deflection yoke upset the desired convergence state of the beam or curve the raster scanned on the screen of the imaging tube. In the prior art it is known that these characteristics can be controlled so that the deflection yoke itself can be used to help the beam convergence and the formation of satisfactory rasters. For this purpose, agglomerated active side windings in a saddle-type deflection coil have a cross-sectional distribution that changes from front to back and the shape of the coil window changes. However, the precision of the windings of the saddle-shaped coil was not achieved because each of the windings was placed in an arbitrary position when the coil was wound.

Therefore, Saddle coils have been used in relatively complex devices in addition to yokes to establish satisfactory convergence and raster conditions. In contrast to the saddle type coils, coils wound in a toroidal shape with a very precise position of each conductor have been developed so as to maintain the conductor in the groove by using a flared ring at the front end and the rear end. These leads are placed in a plane determined by the grooves holding the leads at the front and rear ends of the yoke, respectively. By properly separating the conductors, forming and interleaving the conductors, the yoke can be produced with a good production repeatability and satisfactory operation. However, in most cases it is necessary to use the same ancillary convergence and raster correctors as these exact cones. Preferred is a precision winding deflection yoke that gives the yoke designer more freedom in designing the yoke, which reduces or eliminates any convergence or raster correction device used with the yoke.

According to the invention, the deflection yoke comprises a core having first and second sets of grooves provided in the front and rear of the core for securing the windings in front and rear of the core. The third set of grooves is arranged inside the core between the front and rear portions to secure the windings in the middle of the core along the longitudinal axis of the core to form a precisely arranged non-radial winding.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

In FIG. 1, the glass envelope 12 of the color television imaging tube 11 includes a glass face plate portion 13 covering the front surface of the imaging tube forming the screen. Hole masks 16 comprising a plurality of holes 16 are separated by a relatively narrow gap behind the face plate in the glass envelope, through which the electron beam passes through a plurality of holes 16, red, blue and green arranged on the inner surface of the face plate 13. Collide with phosphor. At the other end of the image tube 11, the neck surrounds the electron gun component 17. Static convergence and purity components 18 are installed around the outside of the neck. The deflection yoke 19 according to the present invention is installed around the funnel and neck of the imaging tube 11. Deflection yoke 19 has a number of horizontal and vertical deflection coils which, when properly activated by the scanning current, cause the electron beam emitted by the electron gun component 17 to scan the raster on the inner side of the faceplate 13. An annular ferrite core member 22 comprising a winding 20.

Winding 20 forms a return active magnetic field winding on the inner surface of the deflection yoke. In other words, the return winding is made in the saddle coil type method and is the winding 21 shown in FIG. The active winding 20 is held at the inlet region position of the deflection yoke by the groove in the annular ring member 23. The groove in the annular ring member 24 at the outlet of the core 22 holds the winding 20 at the end of the core.

The third annular ring member 26 is installed between the inlet and the outlet of the core at one point around the inner circumference of the core 22, and the grooves in the ring member fix the position of each winding 20 at the intermediate intersection surface of the ferrite core 22. .

FIG. 2 is a front view of the deflection yoke shown in FIG. 1 showing the active winding 20. FIG. The front ring member 24 includes a plurality of separating grooves 24a on the outer diameter of the ring and includes a plurality of separating grooves 24b extending along the inner diameter of the ring 24. The annular ring member 24, including the grooves 24a and 24b, may be made of a suitable material, such as plastic, which may be cast to be secured around the outlet of the core 22. The annular ring member 24 is of a standard capable of firmly holding the core and the members associated with each other by sufficiently applying a suitable pressure to the ring member on the core 22. Optionally, the ring member 24 may be firmly held at the inlet of the core 22 by a suitable adhesive such as epoxy.

2 also shows an intermediate ring member 25 comprising a plurality of grooves 25a. The ring member 25 is firmly held in a predetermined position adjacent the core 22 by a suitable adhesive.

3 shows an annular ring member 23 including a rear ring member 23b that forms a channel to include a plurality of grooves 23a and a return lead portion 21. This ring member, similar to the front ring member 24, is firmly mounted to the rear part of the core 22. In FIG. 3, the rear ring portion 24c is cast to the ring member 24 to form a channel to include the feedback lead. 2 and 3 show the active magnetic field winding 20 between the front and rear portions along the inner surface of the core 22. FIGS.

As used herein, the "radial" winding is in the plane containing the central longitudinal axis of the ferrite core and the "non-radial" winding is not in this plane.

It can be seen that the winding 20 follows the non-radial passage between the core and the deflection yoke 19, ie between the outlet and the inlet. The winding is led to a predetermined groove 23a at the midpoint along the inside of the core 22 to determine the first non-radial path of the winding from the given position behind the yoke as determined by the winding held by the given 23a. The winding is then led from a particular groove 25a to a predetermined groove 24b in front of the deflection yoke 19, i.e., the outlet, to form a second segment of the active winding passage. The second segment extends along a different direction than the first portion of the passageway and is also non-radial. As will be discussed below, many of the windings 20 of the vertical and horizontal deflection coils are located and held along these dual non-radial paths necessary to generate the desired pure deflection magnetic field. Some windings may be radially arranged, such as in conventional deflection yokes, or segments extending between annular members 25 and 24 may be emergency, and portions such as between slide members 23 and 25 may be radial.

In FIGS. 1 and 3, the return windings are returned in the saddle-type deflection coil arrangement, which forms a crossing group of winding 21 at the exit end of the deflection yoke and similar traversal at the inlet of the deflection yoke. Form a winding. As shown in Figures 2 and 3, the groove arrangement may take the form of a relatively close groove 24b that provides a circumferential position of the winding that increases slightly at the outlet of the yoke. From the outlet or groove 24b, the windings become a return winding, so that multiple windings from each separation groove 24b can all pass through a single groove 24a to be convenient for forming the return winding portion of the deflection coil. It can be seen that instead of having the separating groove 24a, the groove 24b can extend the full width of the annular member 24. Importantly, the groove 24b is provided for the precise positioning and maintenance of each copper winding 20.

4 is a perspective view of a toroidal deflection yoke embodying the present invention. The deflection yoke of FIG. 4 is that the return winding 21 is returned by the toroidal method, that is, the return ring from the front ring member 2 to the rear ring member 23 for each active winding 20 of FIGS. It is different from. It can be seen that the rear members 23b and 24c cast in the toroidal yoke implementation are not used due to the different return winding arrangements.

Active winding 20 can form the same winding distribution that the toroidal described in FIG. 4 or the saddle type was used. The formation of the return winding used is important in determining the type of coil winding device that can be used to most effectively wind the desired winding distribution and the effect of the ambient magnetic field generated by the return winding. In some cases, a toroidal winding device may be used more effectively, which can be programmed to rotate the toroidal deflection yoke core 22 in angular motion since the winding is being wound. This provides automatic winding of non-radial turns and lies in the grooves of the front, middle and rear ring portions as each turn is wound.

5 shows in detail the winding distribution obtained by the deflection yoke according to the present invention. As described above, this winding distribution or other preferred winding distribution may use a saddle coil type winding or a toroidal winding. The first upper limit of FIG. 5 shows nine windings shown at the rear, middle and front portions, indicated by C, B and A, respectively, on the inner surface of the core 22. FIG. The outermost conductive line at the rear of the yoke with respect to the X-deflection axis is the angle θ ₂ V. The same conductor as this at the midpoint is angle θ ₂ V and the same conductor in front of the deflection yoke is angle θ ₁ V. Since all angles are different, the lead forms a two segment non-radial path between the front and rear portions of the deflection yoke. To illustrate the adaptability of this arrangement, the conductors at the rear of the core 22 are shown in double layers with one portion and not with the second layer adjacent to the first and second layers. This group of leads then engages a groove in the intermediate ring member to form a continuous adjacent single layer of leads.

A similar arrangement is shown in the large front of the core 22. Obviously, the angle selected for the conductors in the particular distribution arrangement and the third groove set can be determined by the designer of the special deflection yoke to be used for the particular sound line.

In FIG. 5, at the second upper limit, a group of ten horizontal coil windings is firmly attached to the C position at the rear of the yoke, the B position at the middle of the yoke, and at the front of the yoke, i.e., the A position at the exit. You can see that it is maintained. These horizontal leads form three different angles, θ ₁ H, θ ₂ H and θ ₃ H at different locations on the core. In addition, the particular lead distribution can be determined by the needs of a particular design for a given display system.

As can be seen in Figures 2, 3 and 4, the groups of conductors overlap at different angles. For example, it is preferable to wind the conductors forming the vertical deflection coils at different angles rather than the conductors forming the horizontal deflection coils. The grooves in the annular ring member can be formed deep enough to maintain a number of turns allowing for this type of winding distribution.

The apparatus of the present invention provides a position with independent angles with respect to the horizontal and vertical deflection axes of each winding at the back, middle and front of the core. Therefore, the pincushion, astigmatism, and coma of the deflection yoke, which have better adaptation than the conventional arrangements described above, for the winding distribution of the special deflection yoke and the separate vertical and horizontal deflection coils forming the yoke. It can be easily wound up to control its properties. For example, it can be seen that replacing the winding distribution at the front of the deflection yoke has the greatest effect on pincushion correction.

Replacing the winding distribution in the center region of the deflection yoke provides the greatest effect on the replacement of the astigmatism characteristics of the deflection yoke, which can be used to provide a magnetic convergence effect on the electron beam of the cathode ray tube. . In addition, replacing the conductor distribution at the rear of the deflection yoke, that is, the small diameter part, provides the greatest effect on the deflection yoke and coma replacement. This characteristic is because a raster formed by one beam is formed by two different beams. Controls whether it is larger or smaller than the raster. This particular compromise made between pincushion, astigmatism and coma characteristics depends on the different specifications and types of cathode ray tube. However, the deflection yoke according to the present invention provides the desired winding distribution capability for most desirable deflection magnetic fields.

Claims (1)

As described herein and shown in the figures, an annular core, each of the cores comprises a set of first and second grooves spaced around the inlet and outlet, and comprises a non-radial passage in relation to the central longitudinal axis of the deflection yoke. In a deflection yoke having conductors arranged along, in particular, a third set of grooves separated circumferentially with respect to the inner surface of the core at a position between the inlet and the outlet of the core, and a set of first and second grooves. The inner surface of the core engaging at least some windings with respective grooves of the respective first, second and third groovesets in order to maintain the windings along each non-radial passage in relation to the axis between them. A deflection yoke having non-radial windings for tapping conductors wound in a plurality of turns relative to the core to form a horizontal and vertical deflection coil portion extending along.

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