JPH0452926Y2 - - 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 the 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. And in this case, "King"
As shown in FIG. 8, the shaped cores 51 and 52 are housed together with a spacer 53 in a substantially elliptical cylindrical hollow part 56a formed in the coil bobbin 56, and spring pieces and adhesives are attached to both ends of the coil bobbin. It was constructed by attaching magnets 58 and 59 via fixing means (not shown) such as adhesive.

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, it is necessary that the pair of cores 51 and 52 be reliably fixed without moving within the coil bobbin. It also improves work efficiency,
In order to increase productivity, the overall structure of the device must be simple and the assembly work must be easy.

<Problems to be solved by the invention> However, in the conventional dynamic convergence correction device described above, it is difficult to regulate the position of the pair of cores within the coil bobbin (inside the hollow part), and it is difficult to maintain a stable state due to characteristics. The problem was that I couldn't get it. In addition, the cores are housed in the coil bobbin with a spacer sandwiched between the pair of cores, and a fixing means is required to attach the magnet to the outer surface of the outer flange of the core. In addition to becoming more complex and increasing the number of parts, which leads to increased costs, assembly work becomes more complicated, reducing work efficiency and reducing productivity.
There was also a problem.

<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. The control coils are each wound separately over the pair of cores, and the control coils are 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 are magnetized in the thickness direction. In a dynamic convergence correction device in which a magnet is attached, a coil bobbin around which a control coil is wound is configured with an approximately "8" shaped space on the inner surface and enlarged portions on both ends toward the outside. The core is housed in the space of the coil bobbin, and the magnet is housed in the enlarged part of the coil bobbin. Each of the enlarged parts of the coil bobbin has a pressing means on its inner surface that comes into contact with the surface of the magnet, and an external circuit on its outer periphery. A cover having an engaging pawl that engages with a plate having a connecting means is attached and fixed thereto.

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

FIG. 1 is a partially sectional schematic plan view showing the structure of an embodiment of a dynamic convergence correction device according to the present invention. In FIG. 1, reference numerals 1 and 2 are a pair of approximately "king"-shaped cores, and a pair of controlled coils 3 and 4 are connected to the cores 1 and 2.
One of the controlled coils 3 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. A coil bobbin 5 is attached to surround the controlled coils 3 and 4, and a control coil 6 is wound around the outer surface of the coil bobbin 5 so as to surround the controlled coils 3 and 4. Magnets 7 and 8 are respectively magnetized in the thickness direction and are attached to the outer surfaces of the outer flanges 1a, 1b, 2a and 2b of the pair of cores 1 and 2. Reference numerals 9 and 10 denote lid-shaped covers, which are attached and fixed to both ends of the coil bobbin 5 so as to cover the opening surfaces of each end, and the dynamic convergence correction device DC is constituted as a whole. It is. As shown in FIGS. 2 to 4, the coil bobbin 5 forming a part of the dynamic convergence correction device DC has an approximately "8" shaped space 5a on its inner surface, and a pair of cores 1,
2 is inserted into the space 5a of the coil bobbin 5,
The cores 1 and 2 are arranged parallel to each other with a space 5a interposed therebetween and with a predetermined distance S between the cores 1 and 2 due to a partitioning protrusion T provided in the space 5a. Further, at both ends of the coil bobbin 5, enlarged portions 5b are provided in the outward direction.
5c is provided, and a jetty-like position regulating means 5d is formed on the inner surface of the enlarged parts 5b, 5c, and the magnets 7, 8 mentioned above are positioned by the position regulating means 5d, and the enlarged parts 5b , 5c. Then, the enlarged portion 5 of the coil bobbin 5
Locking pieces 5e are formed diagonally protruding from the outer surfaces of b and 5c. On the other hand, the covers 9 and 10 attached and fixed to both ends of the coil bobbin 5 are shown in FIGS.
As shown in the figure, the enlarged portion 5b of the coil bobbin 5,
It has a lid shape that approximately matches the shape of coil bobbin 5c, and on the inner surface of the bottom, a pressing means 11 consisting of a projection or the like is formed near the center with a spring property, and the tips of enlarged parts 5b and 5c of coil bobbin 5 are formed at both ends. A step-shaped stopper 12 is formed on the outer periphery, and on the outer periphery there is formed an abbreviated "L" which engages with a board piece (not shown) such as a printed circuit board having an external circuit connection means in a diagonal direction. ”-shaped engagement claw 13 is provided,
Similarly, at a position substantially orthogonal to the engaging claw 13 on the outer periphery,
A locking hole 14 is bored corresponding to the locking piece 5e formed on the enlarged portions 5b, 5c of the coil bobbin 5.

In the dynamic convergence correction device having such a configuration, the cores 1 and 2 around which the pair of controlled coils 3 and 4 are wound are inserted into the approximately "8" shaped space 5a provided on the inner surface of the coil bobbin 5. do. At this time, the cores 1 and 2 are arranged in the space 5a parallel to each other in accordance with the shape of the space 5a, with a predetermined distance S being formed between the cores 1 and 2. On the other hand, cores 1 and 2 (controlled coil 3,
A control coil 6 is wound around the outer periphery of the coil bobbin 5, and magnets 7 and 8 are housed in enlarged portions 5b and 5c provided at both ends of the coil bobbin 5. After that, the enlarged part 5 of the coil bobbin 5
The locking piece 5e provided on the outer surface of b, 5c and the cover 9,
By engaging the locking holes 14 provided in the coil bobbin 5 with each other, the enlarged portions 5b, 5 at both ends of the coil bobbin 5
A dynamic convergence correction device DC is constructed by attaching and fixing the covers 9 and 10 to the covers 9 and 10.
3 to a plate piece such as a printed circuit board having external circuit connection means fixed on the enlarged rear portion of the deflection yoke.
Here, by fixing the covers 9, 10 to the enlarged portions 5b, 5c of the coil bobbin 5, the pressing means 11 provided on the inner surface of the covers 9, 10 presses the surfaces of the magnets 7, 8 toward the core. As a result, the magnets 7 and 8 can be securely and firmly attached to the cores 1 and 2.

It should be noted that 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. can be modified and changed as necessary. Of course.

<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, by simply inserting a pair of cores into the approximately "8" shaped space provided on the inner surface of the coil bobbin, there is no need for separate parts such as spacers, and the position of the cores and the spacing between the cores can be accurately and reliably determined. This eliminates the possibility of the core changing position. In addition, the magnet attached to the outer surface (both ends) of the outer flange of the core is also pressed in the direction of the core by the pressing means provided on the cover attached and fixed to the enlarged portions at both ends of the coil bobbin, and the magnet is attached to the core. This can be done reliably and firmly without using any separate fixing means. As a result, it is easy to
A dynamic convergence correction device can be obtained with a simple assembly process, which is advantageous in terms of cost and workability. It is also highly suitable for mass production, and can be made compact. Since the position is reliably defined, extremely stable characteristics can be obtained over time. Further, a sufficient insulation distance between the controlled coil and the control coil can be ensured, which is advantageous in terms of dielectric strength.

[Brief explanation of drawings]

FIG. 1 is a partial 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 a coil bobbin, and FIG.
The figure is also a front view of the coil bobbin, and Figure 4 is the 3rd view of the coil bobbin.
5 is a front view of a cover according to an embodiment of the present invention, FIG. 6 is a perspective view of the cover, and FIG. 7 is a diagram of a conventional dynamic convergence correction device. Partial cross-sectional schematic plan view, No. 8
This figure is also a partially divided perspective view, and FIG. 9 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... substantially "8" shaped space section, 5b, 5c... expanding section, 6...
...Control coil, 7, 8...Magnet, 9,10
. . . Cover, 11 . . . Pressing means, 13 . . . Engaging claw.

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 control coil, and a magnet magnetized in the thickness direction is attached to the outer surface of the outer flanges of the pair of cores, the coil bobbin around which the control coil is wound,
A substantially "8" shaped space is provided on the inner surface, and enlarged parts are provided outwardly at both ends, the pair of cores are accommodated in the space of the coil bobbin, and the magnet is placed in the enlarged part of the coil bobbin. Each of the enlarged portions of the coil bobbin has an engaging claw that has a pressing means that contacts the surface of the magnet on the inner surface and engages with a plate piece that has an external circuit connecting means on the outer periphery. A dynamic convergence correction device characterized by a fixed cover.