KR100295452B1 - Deflection Yoke for Cathode-ray Tube - Google Patents

Abstract

The present invention is to improve the yield and deflection sensitivity of the cathode ray tube deflection yoke, in the deflection yoke of the deflection yoke mounting portion having a pyramidal shape around the tube axis from the neck side to the panel side, the plastic ferrite in the inner region of the deflection yoke Or by forming a first core having a rubber ferrite material, and forming a second core bonded to the first core and having a second core having a ferrite material in an area outside the horizontal and vertical axes about the tube axis of the first core. Due to the first core formed of a plastic or rubber-free ferrite and a second core formed of a ferrite material having excellent electrical and magnetic properties, the dimensional dispersion generated in the inner surface of the core during the process is eliminated, It provides deflection yoke for cathode ray tube which can improve the characteristics, yield and deflection sensitivity of products.

Description

Deflection Yoke for Cathode-ray Tube

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke for a cathode ray tube. In particular, in a core of a deflection yoke having a substantially rectangular cross section of a deflection yoke of a portion close to the panel side of the yoke mounting portion, the inner first core is a plastic ferrite core or a deflection yoke. It relates to a deflection yoke for cathode ray tubes which is formed of a rubber ferrite core, and formed of a second core made of ferrite material having excellent magnetic and electrical performance on the outside of the first core, thereby improving the yield and deflection sensitivity of the product. .

A typical cathode ray tube is a glass panel 1 having a substantially rectangular shape when viewed from the front, a funnel-shaped glass funnel 2 coupled to the panel 1, and a funnel 2, as shown in FIG. The cylindrical glass neck 3 provided in the edge part of which diameter is small is formed.

In the neck 3, an electron gun 6 which is arranged in a line on the same horizontal plane and scans the electron beam 5 of red (R), green (G) and blue (B) is enclosed, and the neck of the funnel 2 is enclosed. In the vicinity of the (3) side, a self-convergence deflection yoke 8 using a non-uniform magnetic field is mounted to deflect the electron beam 5 to the front surface of the phosphor screen 7.

Then, the deflection yoke 8 generates a pincushion type horizontal deflection magnetic field and a barrel type vertical deflection magnetic field, whereby the three electron beams 5 emitted from the electron gun 6 are wide-angled. It is deflected and landed on the phosphor screen 7 through the shadow mask 9, which is a color screening electrode, to display a color image.

As shown in the rear view of FIG. 2, the portion in which the deflection yoke 8 of the cathode ray tube is formed, that is, the yoke mounting portion is closer to the circular shape toward the neck 3 side, and is closer to the rectangular shape toward the panel 1 side. You can see that it is).

Looking at the structure of the deflection yoke 8 in more detail with reference to Figure 3 as follows.

The deflection yoke 8 basically includes a vertical deflection coil 10 for deflecting the electron beam 5 in the vertical direction, a horizontal deflection coil 11 for deflecting the electron beam 5 in the horizontal direction, and a vertical direction. Mechanisms, such as ferrite cores 12 and horizontal / vertical deflection coils 10 and 11 and ferrite cores 12, which are used to reduce magnetic force loss of the vertical deflection magnetic field generated by the deflection coil 10 to increase magnetic efficiency. It is composed of a holder 13 which serves to fix and couple mechanically while determining the relative position and insulates between the vertical deflection coil 10 and the horizontal deflection coil 11.

When the current having a frequency of 15.75 kHz or more is conducted to the horizontal deflection coil 11, the deflection yoke 8 configured as described above generates a pincushion type horizontal deflection magnetic field to deflect the electron beam 5 in the horizontal direction. When a current having a frequency of 60 Hz is normally conducted to the vertical deflection coil 10, a barrel-type vertical deflection magnetic field is generated to deflect the electron beam 5 in the vertical direction.

Then, a convergence coil 14 is installed on the neck 3 side of the holder 13 to improve coma aberration caused by the vertical barrel type magnetic field, and a ring band provided on the neck 3 side end of the holder 13. It is mechanically coupled to the funnel 2 by (15).

The magnet 16 is installed at the upper and lower circumferential surfaces of the holder 13, that is, at the upper and lower ends of the opening of the deflection yoke 8, so that raster distortion (hereinafter, referred to as 'distortion') on the screen is provided. ) Is corrected.

FIG. 4 is a front view showing the core cross-sections of the fin and fin portions of FIG. 3 (b), and FIG. 4 (a) shows the cross-sectional view of the fin portion of FIG. 4 (b). The cross section of the part is shown.

Since the exterior of the deflection yoke 8 is mounted in the shape of a pyramid as shown in Fig. 2, the first core 17 and the second core 19, which are circular toward the neck 3 side, are formed as shown in (a). As shown in (b), the first core 17 and the second core 19, which are substantially rectangular toward the panel 1 side, are formed, and the inner surface 17-1 and the first surface of the first core 17 are formed. The joining surface 18 of the 1st core 17 and the 2nd core 19, and the outer surface 19-1 of the 2nd core 19 are also formed in the same shape as the shape of a core.

In addition, the core has a shape symmetrical with each other in the horizontal axis (X) and the vertical axis (Y) direction about the tube axis (Z), the first core 17 and the second core 19 is electrically and magnetically performance This excellent ferrite material is used in the same manner.

As described above, in the case of the conventional deflection yoke 8 for the cathode ray tube, a ferrite core is mainly used. The ferrite cores 17 and 19 are transition metals for enhancing magnetic properties. At least one of Mg-Cu-Zn, Mg-Mn-Zn, Ni-Cu-Zn, and Mn-Zn is mixed with each other and the base material, ferric oxide (Fe ₂ O ₃ ), is preformed and then plasticized. After the micro grinding process, the molding process is performed. Subsequently, the ferrite material is produced through a complex process such as firing and processing at a high temperature of 1000 ° C. or higher.

In these processes, if the size of the core before firing is about 120%, it is reduced to a level of 100% after firing, which usually results in an error of 2% of dimensional dispersion.

As described above, when the deflection yoke 8 for cathode ray tubes is designed in a conventional manner, processing tolerances are limited due to limitations in the manufacturing process of the ferrite cores 17 and 19 which have a shrinkage ratio of usually 20%. In the case of the ferrite cores 17 and 19 used to make the deflection yoke 8 for high-definition deflection, which has reached the level of ± 2%, the grinding process is additionally performed to precisely dimension the inner surface. As a result, the unit cost rises as much as 30%.

In the case of a deflection yoke for televisions in which the absolute amount of misconvergence is much lower than that of the deflection yoke used in the monitor cathode ray tube managed by the production line, the inner surface of the cores 17 and 19 used and It is used in the state of accepting the overall dimensional dispersion, which causes the dispersion in the manufacturing process of the deflection yoke (8), that is, the dispersion of the characteristics due to the assembly dispersion of the cores 17 and 19 to be very large, In the process of attaching the deflection yoke, there is a problem in that it takes a lot of time to finish the characteristics due to the dispersion by the assembly of the deflection yoke described above.

In addition, in recent years, in order to improve the sensitivity of the deflection yoke 8, as shown in FIG. 4 (b), a technique for making the shape of the core inner surface 17-1 almost rectangular has been developed and applied. It is very difficult to grind the inner surface 17-1 of the cores 17 and 19, so it is difficult to manage precise dimensions. Accordingly, the production yield is reduced to a level of 50% compared to the existing circular inner cores. As a result, the unit price increase has a problem of increasing to 200% compared to the existing circular inner core.

In addition, in order to compensate for the shortcomings of the ferrite cores 17 and 19 due to the dimensional dispersion in manufacturing, a plastic material having excellent moldability is used as a binder, and a soft magnetic material is added thereto to perform plastic working. However, the plastic core made in this way acts as a limited technology to increase the magnetic properties compared to the existing ferrite cores. Inevitably, there was a problem that caused an increase in volume and manufacturing price.

Accordingly, an object of the present invention is to form a plastic ferrite molded core or a rubber ferrite molded core to the inside of the core so as to have mechanically precise dimensions, and to form a ferrite core having excellent magnetic and electrical performance to the outside of the core. By constructing the core in such a manner, it is to provide a deflection yoke for cathode ray tubes, which improves the yield, coarse dispersion and overall deflection sensitivity of the deflection yoke.

1 is a side view of a typical cathode ray tube,

FIG. 2 is a rear view illustrating the deflection yoke portion of FIG. 1;

3 is a view showing in detail the deflection yoke of Figure 1, Figure 3 (a) is a front view, Figure 3 (b) is a side view,

4 is a front view showing a cross-section of the ridge portion and the ridge portion of the deflection yoke in FIG. 3 (b),

5 to 6 are cross-sectional views showing the side and deflection yoke of the cathode ray tube to which the present invention is applied. FIG. 5 is an external side view of the cathode ray tube, and FIG. 6 is a front view of the core of the deflection yoke showing each cross section of FIG. 5. ,

7 is a front view showing a core cross section of the deflection yoke according to an embodiment of the present invention.

8 is a diagram illustrating the horizontal deflection magnetic field and the vertical deflection magnetic field generated by the horizontal deflection coil and the vertical deflection coil of the deflection yoke.

FIG. 9 is a front view illustrating a core cross section of a deflection yoke according to another embodiment of the present invention, and illustrates a cross section of an E-E ′ portion of FIG. 5.

FIG. 10 is a front view showing a core cross section of the deflection yoke according to another embodiment of the present invention, and shows a cross section of the portion 'E-E' of FIG.

Explanation of symbols on the main parts of the drawings

100: cathode ray tube 110: neck

130: deflection yoke 131: first core

131-1: Inner surface of first core 135: Bonding surface of first core and second core

139: second core 139-1: the outer surface of the second core

150: Funnel 170: Panel

Z: Tube axis X: Horizontal axis

Y: vertical axis

In the deflection yoke for the cathode ray tube of the present invention for achieving the above object, in the deflection yoke mounted to the deflection yoke mounting portion having a pyramidal shape around the tube axis from the neck side to the panel side:

(1) a first core having a plastic ferrite or rubber ferrite material in the inner region of the deflection yoke;

(2) It is joined to the said 1st core, It is characterized by including the 2nd core of a ferrite material formed in the outer area | region of the horizontal and vertical axis | shaft centering on the tube axis of a 1st core.

The core of the deflection yoke of the present invention formed as described above is composed of two cores of different materials to dramatically reduce the dispersion of characteristics due to mechanical tolerances that may occur when using a conventional single ferrite core. And, to apply the technique of the present invention to the rectangular cross-sectional deflection yoke having a pyramidal shape as shown in Figs.

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

5 to 6 are cross-sectional views showing the side and deflection yoke of the cathode ray tube to which the present invention is applied. FIG. 5 is an external side view of the cathode ray tube, and FIG. 6 is a front view of the core of the deflection yoke showing each cross section of FIG. 5. .

6 (a) to 6 (e) are cross-sectional views taken along cut lines AA ′ to EE ′ from the neck portion to the opening portion of FIG. 5, and the inner curvature of the deflection yoke 130 is generally at the neck portion. When viewed from the tube axis Z to the middle portion and the opening portion, the neck portion 110 set at the electron gun mounting portion of the cathode ray tube 100 is adapted to the shape of the funnel as shown in FIGS. 6A to 6B. It has a circular shape, and in the opening of the deflection yoke 130, as shown in FIG. 6 (e), it is almost rectangular, which is a shape for improving the deflection sensitivity, and in the case of the middle portion of the core located therein. As shown in 6 (c) to (d), it has an elliptical shape that gradually changes from circular to rectangular.

FIG. 7 is a front view illustrating a core cross section of the deflection yoke according to the exemplary embodiment of the present invention, and illustrates a cross section of the core of the opening of the deflection yoke 130, that is, the E-E ′ portion of FIG. 5.

The deflection yoke 130 core of the present invention is composed of a first core 131 and a second core 139, as shown in the figure, the inner surface (131-1) of the first core 131 is almost rectangular The joint surface 135 to which the first core 131 and the second core 139 are joined is formed in a circular shape, and the outer surface 139-1 of the second core 139 has a shape close to a rectangle. Consists of

The first core 131 and the second core 139 of the deflection yoke 130 are formed of different materials.

That is, to form the core to take advantage of the functions of the first core 131 and the second core 139, having a non-circular portion of the core that plays an important role in the shape of the horizontal and vertical deflection magnetic field The inner part of the core is formed of a plastic ferrite molded core or a rubber ferrite molded core having excellent mechanical properties to form the first core 131, and the part extending from the outside of the first core 131 to the outer surface of the core is electrically, The entire core is formed by applying the ferrite second core 139 having excellent magnetic properties.

The deflection yoke 130, which uses the cores 131 and 139 of two different materials according to the present invention, has the most sensitive influence on the shape of the horizontal deflection magnetic field and the vertical deflection magnetic field depending on the dimensions of the cathode ray tube. An inner region corresponding to 10% to 50% of the core thickness d, which is the region where the screen characteristics are most sensitively changed, is applied with a plastic ferrite molding core or a rubber ferrite molding core having almost no mechanical dimension distribution, and the plastic ferrite In the portion extending from the outside of the molding core or the rubber ferrite molding core to the core outer surface (corresponding to 50% to 90% of the core thickness d), a conventional ferrite core having excellent magnetic properties is applied.

In addition, when the joint surface 135 of the first core 131 and the second core 139 has a substantially circular shape with respect to the tube axis Z, the area of each core is an area of the first core 131. It has a thickness d of about 10% in a direction diagonal to the tube axis Z, a thickness d of about 50% in a direction perpendicular to the tube axis, and the region of the second core 139 is a tube axis Z. The deflection yoke 130 is formed with a thickness d of about 90% in the diagonal direction with respect to) and a thickness d of about 50% in the direction perpendicular to the tube axis Z.

However, the region of the first core 131 and the second core 139 is only a preferred embodiment and is not limited to the above-described embodiment, and the joint surface 135 of the first core 131 and the second core 139 is not limited thereto. ), The range of each region may vary.

In addition, the plastic or rubber ferrite of the first core 131 is produced by mixing the plastic or rubber material with the ferrite material through a molding process, plasticity, and a predetermined firing process.

As shown in FIG. 8, the horizontal deflection magnetic field and the vertical deflection magnetic field generated by the horizontal deflection coil 133 and the vertical deflection coil shown in FIG. 8 form a loop of the horizontal deflection magnetic field 137 and the vertical deflection magnetic field not shown through the core. . In this case, the horizontal and vertical deflection magnetic fields incident on the core and the horizontal and vertical deflection magnetic fields exiting through the core are looped at right angles to the inner surface of the core. If there is scatter, the magnetic field generated by the same horizontal and vertical deflection coils is changed by the core, which causes distortion and convergence characteristics of the screen of the cathode ray tube to be changed, resulting in poor screen characteristics.

Therefore, a plastic ferrite molded core or a rubber ferrite molded core having almost no mechanical dimension distribution is applied to the inner surface of the core, that is, the area of the first core 131 corresponding to the range of 10% to 50% of the total core thickness d. Excellent screen characteristics of the cathode ray tube including the lower surface distortion can be obtained.

FIG. 9 is a front sectional view showing a core of a deflection yoke according to another embodiment of the present invention, and illustrates a cross section of the core of the opening of the deflection yoke 130, that is, E-E 'of FIG. 5.

As shown, the core of the deflection yoke is composed of a first core 131 and a second core 139, and may be formed as if the first core 131 is a plastic ferrite or rubber ferrite molded core. The irregularities are formed at intervals and heights, and the joint surface 135 to which the first core 131 and the second core 139 are joined has a circular shape, and the outer surface of the second core 139 has a substantially rectangular shape. have.

The slot-shaped first core 131 has a smaller inner diameter than the conventional one due to the concave-convex shape, and the deflection coil is wound around the concave-convex groove so that the size of the concave-convex groove is deflected. This can be done by matching the height of the coil when the coil is wound.

10 is a front sectional view showing a core of a deflection yoke according to still another embodiment of the present invention, and shows a core cross section of an E-E 'portion of FIG. 5.

As illustrated, the core of the deflection yoke 130 including the first core 131 and the second core 139 is an inner surface 131-1 of the first core 131 formed of a plastic ferrite or rubber ferrite molding core. As shown in Fig. 2, the concave-convex shape is formed at an arbitrary height and size to form a rectangular surface contour, and the joint surface 135 to which the first core 131 and the second core 139 are joined is almost also formed. It has a rectangular shape, and the outer surface 139-1 of the second core 139 also has a shape close to a rectangle.

The slot-shaped first core 131 has a smaller inner diameter than the conventional one due to the concave-convex shape, and the deflection coil is wound around the groove of the concave-convex groove so that the groove size of the concave-convex coil is wound when the deflection coil is wound. Determine to match the height of.

The cores of FIGS. 9 and 10 are formed in a symmetrical structure with respect to the horizontal axis (X) and the vertical axis (Y) about the tube axis (Z).

Meanwhile, although a specific embodiment of the present invention is shown in FIGS. 7 to 10, the ferrite of plastic and rubber material applied to the first core of the deflection yoke is not limited to a material of a specific plastic and rubber material, and generally a cathode ray It is a combination of plastic and rubber resin and ferrite used in the pipe engineering field.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

Therefore, in the present invention by forming the core of the deflection yoke by attaching two cores made of different materials,

First, as described above, a plastic ferrite molded core or a rubber ferrite molded core having almost no mechanical dimensional dispersion is applied to the inner surface portion of the core, which is the area where the screen characteristics of the cathode ray tube including the distortion are most sensitively changed as described above. In addition, by forming the outer surface portion of the core using the existing ferrite core having excellent magnetic properties, not only the deflection sensitivity desired by the rectangular cross-sectional deflection yoke can be obtained, but also the existing plastic product ferrite core is made into a rectangle and applied. In this case, the mechanical dimension distribution of the core can be completely eliminated so that the characteristic deterioration of the core can be completely eliminated as the performance of the core is improved.

Second, productivity is improved by stabilizing cathode ray tube characteristics by dimensional stabilization, which includes unit cost increases due to reduced yield in the production of rectangular ferrite cores. It can be effective.

Third, the unit cost of the horizontal and vertical deflection coils increases due to the deterioration of the magnetic properties, which is a disadvantage of the conventional plastic molding cores, and the area is increased. It can be improved by applying only.

Finally, when the vertical deflection coil is wound directly on the core to realize the complicated magnetic field shape of the vertical deflection coil required in the deflection yoke for high-definition cathode ray tube, by applying the first core having excellent mechanical properties to the inner surface portion of the core. The dispersion of the vertically deflected magnetic field occurs due to the distribution of the inner dimension of the core. The present invention uses the first core having almost no mechanical dimension distribution as the inner surface of the core, thereby obtaining the characteristics of the high-definition deflection yoke.

Claims (9)

In the deflection yoke mounted on the deflection yoke mounting portion having a pyramidal shape around the tube axis from the neck side to the panel side: (1) a first core having a plastic ferrite or rubber ferrite material in the inner region of the deflection yoke; (2) A deflection yoke for a cathode ray tube bonded to the first core and including a second core of a ferrite material formed in an outer region of a horizontal and vertical axis about a tube axis of the first core. The method of claim 1, The joining surface where the first core and the second core abut each other, A deflection yoke for a cathode ray tube, characterized by a substantially circular shape around a tube axis. The method of claim 1, The joining surface where the first core and the second core abut each other, A deflection yoke for cathode ray tubes, characterized in that it is substantially rectangular in shape about a tube axis. The method of claim 1, When the joining surface of the first core and the second core has a substantially circular shape with respect to the tube axis, the first core is A deflection yoke for a cathode ray tube, characterized in that it is applied to an area ranging from 10% to 50% with respect to any one of a direction perpendicular to a tube axis and a direction diagonal to the tube axis. The method of claim 4, wherein The area of the first core, A deflection yoke for a cathode ray tube, characterized in that it has a thickness of about 10% in a direction diagonal to the tube axis and a thickness of about 50% in a direction perpendicular to the tube axis. The method of claim 1, When the joining surface of the first core and the second core has a substantially circular shape with respect to the tube axis, the second core, A deflection yoke for a cathode ray tube, characterized in that it is applied to an area ranging from 50% to 90% with respect to any one of a direction perpendicular to the tube axis and a direction diagonal to the tube axis. The method of claim 6, The area of the second core is, A deflection yoke for cathode ray tubes, characterized in that it has a thickness of about 50% in a direction perpendicular to the tube axis and a thickness of about 90% in a direction diagonal to the tube axis. The method of claim 1, The inner surface of the first core, A deflection yoke for cathode ray tubes, characterized in that slot-shaped unevenness is formed in the tube axis direction so as to be symmetrical to the horizontal axis and the vertical axis about the tube axis. The method of claim 1, The first core and the second core, Deflection yoke for a cathode ray tube, characterized in that the one-piece is produced integrally in the production.