JPH0452927Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a dynamic convergence correction device for a three-electron gun in-line color cathode ray tube.

<Prior art> As is well known, in three-electron gun in-line color cathode ray tubes, various misconvergence occurs due to tolerance of each component during manufacturing, so the horizontal deflection magnetic field of the deflection yoke By using a pincushion type magnetic field and a barrel type magnetic field for the vertical deflection magnetic field, misconvergence is reduced. However, it is very difficult to eliminate misconvergence by controlling and adjusting the deflection magnetic field alone, so recently, dynamic convergence correction coils are connected to the horizontal and vertical deflection coils, respectively, and the impedance of the deflection yoke is A device that suppresses the occurrence of misconvergence as much as possible by controlling this has been proposed and put into practical use.

A conventional dynamic convergence correction device of this kind, for example, as shown in FIG. A pair of controlled coils 54 and 55 are connected to a pair of cores 51 and 52, and one controlled coil 54 is connected to a pair of cores 51 and 52.
2, the other controlled coil 55 is dividedly wound around the right side winding portion of the cores 51 and 52, and the coil bobbin 56 is wound so as to surround the pair of controlled coils 54 and 55. Control coil 57 through
The outer flange portion 51 of the pair of cores 51 and 52 is wound.
It was constructed by attaching magnets 58 and 59 magnetized in the thickness direction to the outer surfaces of the magnets a, 51b, 52a and 52b. In this case, the coil bobbin 56, as shown in FIG.
A substantially elliptical space 56c is formed on the inner surface of the
A pair of cores 51 and 52 are housed in a space 56c together with a spacer 53, while a magnet 5
8 and 59 are located at both ends of the coil bobbin 56, and fixing means (not shown) such as spring pieces or adhesive are attached.
It was attached via a.

The dynamic convergence correction device having the above configuration is, for example, as shown in FIG.
It is electrically connected to each deflection coil of the deflection yoke. That is, the control coil 57 is connected in series with a pair of vertical deflection coils 60, and is supplied with a vertical deflection current _IV from a vertical deflection circuit 61. On the other hand, the controlled coils 54 and 55 are connected in series with one horizontal deflection coil 62, with one coil 54 disposed at the top of the deflection yoke, and the other coil 55 disposed at the bottom of the deflection yoke. The horizontal deflection coil 63 is connected in series with the horizontal deflection coil 63, and a horizontal deflection current _IH is supplied from a horizontal deflection circuit 64.

It is well known that misconvergence can be corrected by the dynamic convergence correction device having the above configuration, and although the explanation of its operation will be omitted here, it is in an effective operating state (stable characteristics) as a dynamic convergence correction device.
In order to obtain this, the pair of cores 51 and 52 must be securely fixed on the inner surface of the coil bobbin (inside the space 56c formed on the inner surface of the cylindrical portion 56a) with a predetermined distance apart from each other without any positional movement. be. Furthermore, in order to improve work efficiency and increase productivity, the overall structure of the device needs to be simple and the assembly work needs to be easy.

<Problems to be solved by the invention> However, in the conventional dynamic convergence correction device described above, it is difficult to control the position of the pair of cores within the coil bobbin (inside the space) due to the shape, and the cores may move. There was a problem in that it was not possible to obtain a characteristically stable state. In addition, in order to separate the pair of cores by a predetermined distance, the cores must be housed in the coil bobbin with a spacer sandwiched between the cores, which complicates the configuration and increases the number of parts, increasing costs and assembling work. There was also the problem that the process became complicated, reducing work efficiency and productivity.
In addition, it requires a fixing means to attach the magnet to the outer surface of the outer flange of the core, which also raises the problem of increasing costs, lowering work efficiency, and deteriorating workability. It was hot.

<Means for Solving the Problems> In order to solve the above problems, the dynamic convergence correction device of the present invention has a pair of roughly “king”-shaped cores arranged in parallel, and a pair of controlled coils. Each of the control coils was divided and wound around a pair of cores, and the control coil was wound via a coil bobbin so as to surround the outside of the pair of controlled coils, and the outer surfaces of the outer flanges of the pair of cores were magnetized in the thickness direction. In a dynamic convergence correction device equipped with a magnet, the coil bobbin is composed of a substantially elliptical cylindrical portion and enlarged portions formed at both ends of the cylindrical portion, and a control coil is wound around the outer surface of the cylindrical portion. A substantially "8"-shaped space having a partition extending axially opposite to each other is provided in the inner surface of the cylindrical part, and a pair of cores are housed and arranged in the space while being separated from each other by the partition. In addition, the magnet is housed within the enlarged portion.

<Embodiment> Hereinafter, one embodiment of the dynamic convergence correction device of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numerals 1 and 2 denote a pair of approximately "king"-shaped cores, and a pair of controlled coils 3 and 4 are connected to the cores 1 and 2, with one controlled coil 3 extending over the cores 1 and 2. is dividedly wound around the left side windings of the cores 1 and 2, and the other controlled coil 4 is dividedly wound around the right side windings of the cores 1 and 2. 5 is a coil bobbin,
As shown in FIGS. 2 to 4, a substantially elliptical cylindrical portion 5a and enlarged portions 5 formed at both ends of the cylindrical portion 5a.
A control coil 6 is wound around the outside of the controlled coils 3 and 4 on the outer surface of the cylindrical portion 5a. In addition, the cylindrical portion 5a of the coil bobbin 5
A substantially "8" shaped space 5d is provided on the inner surface of the holder. The space portion 5d has partition portions 5e and 5e extending axially opposite each other approximately in the middle, and the pair of cores 1 and 2 are arranged in the space with the controlled coils 3 and 4 wound thereon. It is inserted into the section 5d. At this time, the cores 1 and 2 are arranged parallel to each other via the space 5d and separated by a predetermined distance S by the partitions 5e and 5e. Further, enlarged portions 5b and 5c formed at both ends of the coil bobbin 5 include magnets 7 and 8 that are magnetized in the thickness direction and are attached to the outer surfaces of the outer flanges 1a, 1b, 2a and 2b of the cores 1 and 2. are stored and arranged. Here, the enlarged part 5
A protrusion 5f for position regulation is provided on the inner surface of magnets b and 5c, and the magnets 7 and 8 are positionally regulated by the protrusion 5f and housed in the enlarged parts 5b and 5c. Then, the enlarged portions 5b and 5c of the coil bobbin 5
A diagonally protruding locking piece 5g is formed on the outer surface of the holder. 9 and 10 are enlarged portions 5b of the coil bobbin 5;
As shown in FIG. 5, a pressing means 11 consisting of a protrusion or the like is formed with a spring property near the center of the inner surface of the bottom, and a coil bobbin 5 is attached to the outer periphery of the cover. A locking hole 12 is bored corresponding to the position of the locking piece 5g, and an approximately "L"-shaped engaging claw engages with a plate piece (not shown) such as a printed circuit board. 13 are provided.

In the dynamic convergence correction device having such a configuration, the cores 1 and 2 are provided in an approximately "8" shaped space 5 on the inner surface of the cylindrical portion 5a of the coil bobbin 5.
Insert into d. At this time, the cores 1 and 2 are arranged parallel to each other in accordance with the shape of the space 5d, and
They are arranged in the space 5d with a predetermined distance S separated by the partitions 5e, 5e in the space 5d. next,
The magnets 7 and 8 are connected to the outer flanges 1a of the cores 1 and 2,
The covers 9, 10 are housed inside the enlarged parts 5b, 5c of the coil bobbin 5 while being in contact with the outer surfaces of the coil bobbin 5, and the covers 9, 10 are placed in contact with the outer surfaces of the coil bobbin 5.
are attached and fixed by engaging the locking pieces 5g provided on the enlarged portions 5b, 5c with the locking holes 12 provided on the covers 9, 10. By attaching the covers 9 and 10, the pressing means 11 provided on the covers 9 and 10 presses the magnets 7 and 8 in the direction of the cores 1 and 2, thereby ensuring that the magnets 7 and 8 are fixed to the cores 1 and 2. It is something that is done.

The embodiment of the dynamic convergence correction device of the present invention described above is merely an example of the present invention, and the coil bobbin, cover, etc. may be modified or changed as necessary, except for the essential parts of the present invention. Of course, this is possible.

<Effects of the Invention> The dynamic convergence correction device of the present invention has been described in detail above, and produces the following effects. In other words, an approximately "8"-shaped space having partitions extending axially in opposition to each other is provided at approximately the middle of the inner surface of the approximately elliptical tube, and enlarged portions are provided at both ends of the tube. By simply using a coil bobbin, a pair of cores can be securely and firmly attached and fixed apart from each other without using a spacer, and the magnet attached to the outer surface of the outer flange of the core can also be installed separately. It can be fixed securely and firmly without using any fixing means, and a dynamic convergence correction device can be obtained with a simple and simple configuration and assembly work.
It is advantageous in terms of cost and workability, and is highly suitable for mass production. Also, in terms of characteristics, since the positions of the core and magnet are reliably defined via the coil bobbin, extremely stable characteristics can be obtained over time.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional schematic plan view of a dynamic convergence correction device according to an embodiment of the present invention, FIG. 2 is a front view of the coil bobbin, and FIG.
The figure is also a top view of the coil bobbin, and Figure 4 is the 3rd
5 is a front view of a cover in an embodiment of the present invention, FIG. 6 is a partial cross-sectional schematic plan view of a conventional dynamic convergence correction device, and FIG. Similarly, partially exploded perspective view, No. 8
The figure is a circuit connection diagram of a deflection yoke device using a dynamic convergence correction device. 1, 2... substantially "king"-shaped core, 3, 4... controlled coil, 5... coil bobbin, 5a... cylindrical portion,
5b, 5c... Enlarged part, 5d... Space part, 5e,
5e... Partition section, 6... Control coil, 7, 8...
Magnet.

Claims (1)

[Scope of utility model registration request] A pair of substantially "king"-shaped cores are arranged in parallel, a pair of controlled coils are respectively wound in sections over the pair of cores, and a coil bobbin is wound so as to surround the outside of the pair of controlled coils. In the dynamic convergence correction device, a control coil is wound around the coil bobbin, and a magnet magnetized in the thickness direction is attached to the outer surface of the outer flange portion of the pair of cores, the coil bobbin is formed of a substantially elliptical cylindrical portion;
and enlarged parts formed at both ends of the cylindrical part,
The control coil is wound around the outer surface of the cylindrical portion, and the inner surface of the cylindrical portion is provided with an approximately “8”-shaped space portion having a partition portion extending axially oppositely at an approximately intermediate portion;
The dynamic convergence correction device is characterized in that the pair of cores are housed in the space part so as to be separated from each other by the partition part, and the magnet is housed in the enlarged part.