JPH0722032Y2 - Deflection yoke - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a deflection yoke used for a color cathode ray tube of a color television receiver or a color monitor, and more particularly to a horizontal deflection coil provided with a slit on a molding bobbin. The present invention relates to a deflection yoke in which an armature is wound in a saddle shape.

[Conventional technology]

As a deflection yoke used for a color cathode ray tube, a plurality of slits are provided along the tube axis on the inner surface of a mold bobbin, and a coil wire is arranged in these slits to wind a horizontal deflection coil in a staggered shape. A so-called slit winding deflection yoke is known. In such a deflection yoke, the accuracy of the horizontal deflection coil formed is also affected by the arrangement of these slits. Therefore, by increasing the accuracy of the arrangement of the slits, the conventional winding method using a winding die is adopted. In comparison, the accuracy of the horizontal deflection coil is improved.

On the other hand, in recent years, the tendency toward higher definition of the screen is remarkable, and it has become necessary to eliminate misconvergence due to a slight distortion of the horizontal deflection magnetic field distribution, which has not been a problem in the past. However, the accuracy of the horizontal deflection coil is also limited, and it is very difficult to remove a slight distortion caused by the horizontal deflection magnetic field distribution.

On the other hand, for the purpose of removing the misconvergence called S-ing as shown in FIG. 3 (a),
A horizontal auxiliary coil is provided on the inner surface of the mold bobbin, and this is connected in series to a horizontal deflection coil formed in a square shape so that the horizontal deflection coil distribution can be corrected by the magnetic field of this horizontal auxiliary coil. Deflection yokes are proposed (for example, Japanese Patent Publication No. 58-9541). The deflection yoke will be described below with reference to FIG.

This figure is a front view of the deflection yoke as viewed from the funnel surface side using the half bobbin 2 '. Inner surface 2b 'of bobbin 2'
Is provided with a plurality of slits 5'extending along the tube axis from the front end fringe 2a 'on the funnel surface side to the rear end fringe 2c' on the electron gun side, and the front end fringe 2a 'and the rear end fringe 2a' are provided. The horizontal deflection coil 3'is wound around the inner surface 2b 'of the bobbin 2'in a hook shape by passing the coil wire through the slit 5'while hooking it on the fringe 2c'.

Further, in a portion of the inner surface 2b 'of the bobbin 2'in which the slit 5'is not provided (hereinafter referred to as a window portion of the horizontal deflection coil),
Two auxiliary slits 6a ', 6b' extending along the pipe axis from the front end fringe 2a 'to the rear end fringe 2c' are provided, and the rear end fringe 2c 'passes through the slit 6a' and the front end fringe 2c '. A horizontal auxiliary coil 4'consisting of a coil wire hooked on 2a 'and passing through a slit 6b' is provided.
The horizontal auxiliary coil 4'is connected in series with the horizontal deflection coil 3 '.

Therefore, when a horizontal deflection current is applied to the horizontal deflection coil 3 ',
This also flows to the horizontal auxiliary coil 4 '. As a result, the magnetic field generated by the horizontal auxiliary coil 4'can be used to correct the distortion of the distribution of the horizontal deflection magnetic field generated by the horizontal deflection coil 3 '.

[Problems to be solved by the device]

However, according to such a conventional technique, since the horizontal auxiliary coil 4'is formed over the entire length from the front end fringe 2a 'to the rear end fringe 2c' along the tube axis, the horizontal auxiliary coil 4'is generated. Similarly, the correction magnetic field extends from the front end fringe 2a 'to the rear end fringe 2c' along the tube axis. In order to remove the distortion of the distribution of the horizontal deflection magnetic field due to the horizontal deflection coil 3 ', the distribution of the correction magnetic field generated from the horizontal correction coil 4'must correspond to this distortion. Changes only when the spacing between the slits 6a 'and 6b' changes. Moreover, even if the distance between the slits 6a 'and 6b' is changed,
The tendency of the intensity distribution of the correction magnetic field between the front end fringe 2a 'and the rear end fringe 2b' does not change.

On the other hand, as described above, the misconvergence that needs to be removed along with the increase in the definition of the screen is due to the local distortion rather than the overall distortion of the horizontal deflection magnetic field distribution. . Therefore, the above-described conventional technique that generates the correction magnetic field from the front edge fringe to the rear edge fringe cannot effectively correct the local distortion of the horizontal deflection magnetic field distribution.

Therefore, it is conceivable to provide a horizontal auxiliary coil for locally generating an auxiliary magnetic field between the front end fringe 2a 'and the rear end fringe 2c' in the window of the horizontal deflection coil on the inner surface 2b 'of the bobbin 2'. . However, in this method, it is indispensable to mount a horizontal auxiliary coil formed on the inside of the window of the horizontal deflection coil or to attach it to the horizontal deflection coil, which impairs the productivity of the deflection yoke and increases the cost. It will be.

SUMMARY OF THE INVENTION An object of the present invention is to provide a deflection yoke which can solve such problems, can locally correct the horizontal deflection magnetic field distribution, and can prevent a decrease in productivity.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a deflection yoke in which a horizontal tendency coil is wound around a mold bobbin formed in a funnel shape in a square shape, and the inside of the window of the horizontal deflection coil of the mold bobbin. Then, a one-turn auxiliary slit is provided in a part of the region along the tube axis in both ends of the mold bobbin, and a coil electric wire is arranged along the slit to form a horizontal auxiliary coil.

[Action]

Since the auxiliary slit can be provided with any shape at any position in the window of the horizontal deflection coil, the horizontal auxiliary coil formed along this auxiliary slit also has any shape at any position in the window of the horizontal deflection coil. Can be installed at
A magnetic field can be locally generated inside the mold bobbin by the horizontal auxiliary coil. Therefore, it becomes possible to locally correct the horizontal deflection magnetic field distribution.

Further, since the auxiliary slit is provided and the horizontal auxiliary coil is wound around the auxiliary slit, the horizontal auxiliary coil can be formed by the same method as that of the horizontal deflection coil in which the slit is similarly provided and wound. Since the coil and the horizontal auxiliary coil are installed at different locations on the inner surface of the mold bobbin, the horizontal auxiliary coil can be wound during the winding operation of the horizontal deflection coil. That is, the horizontal deflection coil and the horizontal auxiliary coil can be formed in the process of working the coil electric wire on the mold bobbin.

Further, since the mold bobbin formed in the funnel shape is used, the accuracy of the horizontal deflection coil is improved as compared with the conventional deflection yoke in which two half-cracked bobbins wound around the coil are coupled to each other. A highly accurate horizontal deflection magnetic field distribution can be obtained.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an embodiment of a deflection yoke according to the present invention as seen from the funnel surface side. 1 is a deflection yoke, 2 is a mold bobbin, 2a is a front end fringe, 2b is an inner surface, and 2c is a rear end. Fringe, 3 is a horizontal deflection coil, 4a and 4b are horizontal auxiliary coils, 5 is a slit, and 6a and 6b are auxiliary slits.

In the figure, the deflection yoke 1 is a slit winding deflection yoke using a mold bobbin 2 shaped like a funnel. On the inner surface 2b of the mold bobbin 2, symmetrically in the drawing,
A plurality of slits 5 extending along the tube axis from the front edge fringe 2a on the funnel surface side to the rear edge fringe 2c on the electron gun side are provided, and the front edge fringe 2a and the rear edge fringe are provided.
The horizontal deflection coil 3 is wound around the inner surface 2b in a saddle shape by passing coil electric wires through the slits 5 in a predetermined order while hooking the coil 2c.

Further, on the inner surface 2b of the mold bobbin 2, there are two windows of the horizontal deflection coil on which the horizontal deflection coil 3 is not wound in the upper and lower portions in the drawing, and auxiliary slits 6a and 6b are provided respectively. Each of these auxiliary slits 6a, 6b makes one or almost one turn inside the window of the horizontal deflection coil. A coil wire is arranged along each of these and the predetermined number of horizontal auxiliary coils 4a, 4b are wound. There is. These horizontal auxiliary coils 4a and 4b are connected in series with the horizontal deflection coil 3.

Therefore, when a horizontal deflection current is passed through the horizontal deflection coil 3, this also flows through the horizontal auxiliary coils 4a and 4b, and the horizontal deflection coil 3
A magnetic field (correction magnetic field) is generated by the horizontal auxiliary coils 4a and 4b in the horizontal deflection magnetic field due to. These correction magnetic fields can be in the same direction as the horizontal deflection magnetic field or in the opposite direction.

Here, the installation positions and shapes of the horizontal auxiliary coils 4a and 4b are determined by the installation positions and shapes of the auxiliary slits 6a and 6b, and by appropriately setting the installation positions and shapes of the auxiliary slits 6a and 6b, the mold bobbin 2 It is possible to locally generate a correction magnetic field having a desired magnetic field distribution inside the.

On the other hand, in the conventional deflection yoke using a half-split bobbin, two bobbins, each having a horizontal deflection coil wound in advance, are coupled to each other. In this case, a slit is formed with high accuracy on each bobbin, and the horizontal deflection coil is wound with high accuracy by this slit. However, when these two bobbins are joined, a slight deviation occurs between them. However, a positional deviation occurs between the horizontal deflection coils wound on these bobbins, which causes one of the distortions of the horizontal deflection magnetic field distribution. For this reason, high accuracy is required for coupling the two bobbins, but there is a limit to this, and distortion of the horizontal deflection magnetic field distribution cannot be avoided.

The same applies to the case where the horizontal auxiliary coils are provided on the respective half-split bobbins, and even if the horizontal auxiliary coils are provided on the respective bobbins with high accuracy, two horizontal auxiliary coils are provided when the two bobbins are joined. The relative positional relationship of the coils is displaced, and the distortion of the horizontal deflection magnetic field distribution cannot be corrected with high accuracy.

On the other hand, in this embodiment, the mold bobbin 2
Is formed into a funnel shape equivalent to one in which two half-split bobbins are joined together without any displacement, and slits 5 and auxiliary slits 6a and 6b are formed in this, and the horizontal deflection coil 3 and horizontal auxiliary coil 4a are formed. , 4b are wound, by accurately forming the slit 5 on this, the horizontal deflection coil 3 can be wound with high accuracy, and the distortion of the horizontal deflection magnetic field distribution can be greatly reduced. Further, by setting the shape and installation position of the auxiliary slits 6a and 6b with high accuracy, the horizontal auxiliary coil 4a that generates a correction magnetic field that can sufficiently reduce even a slight distortion of the horizontal deflection magnetic field distribution. , 4b can be provided.

As described above, even a slight distortion of the horizontal deflection magnetic field distribution can be sufficiently suppressed, so that an error called S-ing as shown in FIG. 3 (a) can be achieved without affecting other characteristics of the screen. Convergence and other image distortions such as misconvergence called G-doop shown in FIG. 3 (b) can be sufficiently corrected even if they are slight. Therefore, the high definition of the screen can be sufficiently dealt with, and the high quality screen can be realized.

Horizontal deflection coil 3 to mold bobbin 2 in FIG.
As a specific example of the winding method of the horizontal auxiliary coils 4a and 4b,
A funnel-shaped guide plate having the same shape as the inner surface 2b of the mold bobbin 2 is used. This guide plate is provided with guides corresponding to the slits 5 and guides corresponding to the auxiliary slits 6a and 6b. The guide plates are arranged so that these guides respectively correspond to the corresponding slits 5 and the auxiliary slits 6a and 6b. It is mounted on the inner surface of the mold bobbin 2. After that, an extremely thin nozzle from which the coil electric wire is drawn out from the tip is moved while being guided by the guide of the guide plate. As a result, as the nozzle moves, the coil electric wire is pulled out and fitted into the slit 5 and the auxiliary slits 6a and 6b. This nozzle may be operated manually or may be moved automatically.

As described above, the horizontal deflection coil 3 moves as the nozzle moves.
Since the horizontal auxiliary coils 4a and 4b are formed, the coil mounting work is simplified.

[Effect of device]

As described above, according to the present invention, the horizontal deflection coil can be formed with high accuracy, the distortion of the horizontal deflection magnetic field distribution can be significantly reduced, and the shape and arrangement of the horizontal auxiliary coil can be arbitrarily set. It is possible to sufficiently suppress the local distortion of the horizontal deflection magnetic field distribution, and to sufficiently suppress the image distortion such as a slight misconvergence which cannot be eliminated by the conventional technology, thereby significantly improving the image quality of the screen. You can Further, the horizontal auxiliary coil can be formed at the same time during the winding process of the horizontal deflection coil. Even if the horizontal auxiliary coil is provided, the assembly work is not complicated, and the productivity is reduced and the cost is prevented from increasing. be able to.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a deflection yoke according to the present invention, FIG. 2 is a front view showing an example of a conventional deflection yoke for a half-split bobbin, and FIGS. 3 (a) and 3 (b) are It is a figure which shows the example of the misconvergence which arises by horizontal deflection magnetic field distribution. 2 …… Mold bobbin, 2a …… Front end fringe, 2b ……
Inner surface, 2c ... Fringe on rear end, 3 ... Horizontal deflection coil,
4a, 4b …… Horizontal auxiliary coil, 5 …… Slit, 6a, 6b ……
Auxiliary slit.

Claims (1)

[Scope of utility model registration request] 1. A deflection yoke having a funnel-shaped mold bobbin provided with a paddle-shaped horizontal deflection coil on the inner surface thereof, wherein a horizontal auxiliary coil is provided on a partial region of the inner surface of the mold bobbin. A deflection yoke, wherein coil electric wires are arranged in a predetermined number of turns in a one-turn auxiliary slit formed in the partial area of the inner surface of the mold bobbin.