JPH0329242A - Core unit for deflection yoke - Google Patents

Abstract

PURPOSE:To obtain high dimensional-accuracy of a cylindrical core unit at lower cost by arranging and bonding coil insertion grooveforming members, separately prepared, respectively on the inner circumferential surface of the cylindrical core unit so as to be extendedly positioned in the axial direction of the inner circumferential surface at given intervals along the inner circumferential direction thereof. CONSTITUTION:Each of paired cores 2a, 2b has its inner circumferential surface 2c formed in smoothness. Plural coil insertion grooveforming members 9 made of ferrite are formed respectively in such a shape as to be coordinated along the common axial direction of the inner circumferential surfaces 2c of the cores 2a, 2b and yet positioned respectively at given intervals in the inner circumferential direction of a core unit to be fixed respectively via a bonding agent, for example. Positioning tappets 10 formed on the bonding surfaces of the coil insertion groove-forming members 9 are respectively fitted into their respective relevant positioning recessed portions 11 formed in given sites of the inner circumferential surfaces of the cores 2a, 2b so as to position these respective coil insertion groove-forming members 9 at their respective relevant sites.

Description

[Detailed Description of the Invention] [Field of Application in Industry A] This invention relates to a deflection yoke attached to a color cathode tube, and in particular a high permeability core (hereinafter referred to as core) around which a vertical deflection coil is wound. It is related to.

[Prior Art] FIG. 5 is a perspective view showing a conventional core for this type of deflection yoke;
FIG. 6 is an enlarged longitudinal sectional view.

5 and 6, (1), (1) are vertical deflection coils, and the core (2) is made of ferrite that can be divided into two in the radial direction. (2) are each wound in a toroidal shape. This vertical deflection coil (1)
．． Core (2) around which (1) is wound. (2) is different from the conventional method in that the horizontal deflection coil (3) is arranged around the outer periphery of the separator (4), which is wound in a saddle shape, as shown by the one-dot chain line (imaginary line) in Fig. 6. It is similar to a deflection yoke. (5) is a plurality of coil insertion grooves, and the above core (2)
, (2) at predetermined intervals in the circumferential direction, and are wound around the cores (2), (2), respectively. (1) is inserted. (6) is a core clip, which has a pair of clip grooves (8a) and (8b) provided near the abutting portion (7) of the cores (2) and (2), which are divided into two in the radial direction.
straddles and is elastically engaged with both cores (2).
, (2) are combined into one. FIG. 7 shows the cores (2) joined together by the core clip. A perspective view of only (2), and FIG. 8 is a perspective view of only two divided cores (2), (2).

[Problems to be Solved by the Invention] A "sawtooth current" for scanning flows through the horizontal deflection coil (3) and the vertical deflection coil (1) of a conventional deflection yoke of this type, and both coils (3) In (1), alternating current loss (copper loss, eddy current loss, and skin loss) occurs, and iron loss (hysteresis loss and eddy current loss) occurs in cores (2) and (2). In particular, in recent years, the frequency of the horizontal deflection coil (3) side has been increased in order to improve image resolution, so the above AC loss and iron loss are further increased, and abnormal temperature rises in various parts of the deflection yoke are caused. The disadvantage is that convergence changes occur due to deformation, resulting in color shifts on the screen. In order to suppress the temperature rise of the deflection yoke as described above, for example, both coils (3). (1) A core (
Measures have been taken to bring the inner circumferential surfaces of cores (2) and (2) as close as possible to the cathode ray tube, but in this case, vertical deflection coils ( 1)
By providing a plurality of coil accommodating grooves (5) for accommodating the cores (2
)． The inner surface (2a) of (2) is arranged to be close to the cathode ray tube.

In general, the above core (2). (2) is made by the ferrite firing process, but it is difficult to simultaneously form the coil accommodation groove (5) during press molding of the ferrite raw material, and the shrinkage rate of this press molded product during sintering is low. Due to its high cost, it is impossible to manufacture it with high precision as a core for a deflection yoke. Further, in the case where the coil housing groove (5) is formed by cutting or polishing on the flat inner circumferential surface of the core (2), (2) after sintering, this core (2). (2)
Because of its extremely high hardness, it is extremely difficult to process.
It is difficult to form the coil receiving groove (5) into a predetermined shape and requires a special processing machine, which has the drawback of increasing the cost of the deflection yoke.

[Means for Solving the Problems] A core for a deflection yoke according to the present invention includes a cylindrical core around which a vertical deflection coil is wound, and a cylindrical core arranged on the inner peripheral surface of the core at predetermined intervals in the circumferential direction, A plurality of protrusions extending in the axial direction of the core to form a plurality of coil accommodating grooves are also provided.

[Function] According to the present invention, a plurality of protrusions forming a plurality of coil accommodation grooves are provided at predetermined intervals in the circumferential direction on the inner peripheral surface of the cylindrical core around which the vertical deflection coil is wound. 7, it is possible to form a coil accommodating groove very easily on the inner circumferential surface of the core.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a perspective view showing a core for a deflection yoke according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1, and FIG. 3 is a perspective view showing a protrusion. Yes, first
In the figure, parts that are the same as or corresponding to those in the conventional system shown in FIG. 7 are given the same reference numerals, and detailed explanation thereof will be omitted. In FIG. 1, (9) is a plurality of protrusions made of ferrite, which are arranged at predetermined intervals in the circumferential direction of the inner peripheral surfaces of the cores (2), (2). 2) by extending in the axial direction of the core <2), for example by adhesive.
．． (2) is fixed at a predetermined position on the inner peripheral surface. As shown in Figure 3, each protrusion (9) of the Doki is attached to the core (2) above.
, (2) is made in a shape that extends in the axial direction of the inner circumferential surface and overlaps the entire length. Core (2)
)． (2) is provided in order to extend in the axial direction and form a plurality of coil accommodation grooves (5) on the inner circumferential surface.

(lO) is a plurality of protrusions for positioning formed on the overlapping surface of each of the protrusions (9), and each of these protrusions (10) is connected to the core (2), (2) as shown in FIG. ) to position each protrusion (9) at a predetermined position by fitting into a positioning recess (11) formed at a predetermined position on the inner peripheral surface of the protrusion (9).

In the above embodiment, a positioning protrusion (lO) is formed on the overlapping surface of each protrusion (9), and the core (2)
, (2) has been described in which a positioning recess (11) into which the protrusion (lO) fits is formed at a predetermined position on the inner circumferential surface of each protrusion (9). It goes without saying that the protrusion (9) can be positioned by providing a recess (l1) in the core and a protrusion (10) on the inner peripheral surface of the core (2).

[Effects of the Invention] According to the present invention, the vertical deflection coils are arranged at predetermined intervals in the circumferential direction on the inner peripheral surface of the cylindrical core around which the vertical deflection coil is wound,
In addition, since a plurality of protrusions extending in the axial direction of the core to form a plurality of coil accommodation grooves are provided, it is possible to form the coil accommodation grooves at the same time during press molding of the ferrite raw material and sinter it, as in the past. This deflection yoke is not only much easier to machine than a coil-accommodating groove that is machined into the flat inner circumferential surface of the core after sintering, but also has a highly precise coil-accommodating groove. It is possible to manufacture cores for Further, according to the present invention, since a special processing machine is not required, there is also an effect that the cost of the deflection yoke does not increase.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a core for a deflection yoke according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along the line II--II in FIG. 1, FIG. The figure is a perspective view showing the core in the middle of processing, Figure 5 is a perspective view showing a conventional deflection yoke core with a vertical deflection coil wound around it, Figure 6 is a vertical cross-sectional view, and Figure 7 is only the deflection yoke core. FIG. 8 is a perspective view showing a deflection yoke core divided into two parts. (1)... Vertical deflection coil, (2)... Core, (
3) ゛...Horizontal deflection coil, (4)...Severator, (5)...Coil accommodation groove, (9)...Protrusion. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 1 Figure 2 Figure 5 Figure 6 Figure 3 Figure 4 Figure 7

Claims (1)

[Claims] (1) A horizontal deflection coil provided on the inner circumference of the separator, a cylindrical core provided on the outer circumference of the separator and around which a vertical deflection coil is wound, and a predetermined interval in the circumferential direction on the inner circumference of the core. A core for a deflection yoke, comprising a plurality of protrusions that are spaced apart and extend in the axial direction of the core to form a plurality of coil receiving grooves.