JPS6326500B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection yoke suitable for application to a deflection yoke for an in-line beam type color cathode ray tube.

Some deflection yokes used in in-line beam type color cathode ray tubes such as Trinitron (registered trademark) have a horizontal deflection coil wound in a saddle shape and a vertical deflection coil wound in a toroidal manner.

In such a deflection yoke, in order to correct left-right pink-tension type raster distortion, the distribution of the vertical deflection magnetic field formed by the vertical deflection coil is changed to a pink-tension type magnetic field on the panel side of the cathode ray tube, as shown in Figure 1. In addition, it is well known that a barrel-shaped magnetic field can be used on the network side.

Therefore, various deflection yokes that can obtain a vertical deflection magnetic field with such a magnetic field distribution have been proposed. Therefore, these conventional deflection yokes will be explained below.

The deflection yoke shown in FIG. 2 is obtained by winding a vertical deflection coil 2 around a core 1 in an inclined toroidal manner so that the gap is large on the neck side and small on the panel side as shown. The deflection yoke shown in FIG. 2 has the following drawbacks compared to a normal flat-wound deflection yoke. Requires special winding machine. There are large variations in the winding distribution. Coil winding can easily occur.
Since the length of the conductor wire (copper wire) per turn of the coil becomes large, the vertical deflection efficiency becomes low.

The deflection yoke shown in FIG. 3 has four auxiliary magnetic bodies 4 arranged around the deflection yoke on the panel side as shown. Note that 3 indicates a horizontal deflection coil wound inside the core 1 in a saddle shape, and a vertical deflection coil (not shown) is wound flat around the core 1 in a toroidal manner. The deflection yoke shown in Fig. 3 has the advantage that the vertical deflection efficiency is improved by reducing the effective magnetic resistance, but the disadvantage is that the degree of freedom of the vertical deflection magnetic field is small and the deflection yoke is large. There is.

On the other hand, the deflection yoke shown in Fig. 4 has the following effects: horizontal misconvergence on the horizontal central axis (X-axis) of the panel surface of the cathode ray tube, horizontal misconvergence on the vertical central axis (Y-axis), and vertical misconvergence at the corner. In order to correct all misconvergence, a vertical deflection coil 2 is toroidally wound around a core 1 whose neck end is shorter than a normal one, and a saddle-shaped horizontal deflection coil 3 is exposed to the outside. This is how it was done. In this case, the length L between the neck side ends of the vertical and horizontal deflection coils 2 and 3 is selected to be sufficiently large to reduce the attenuation on the neck side of the deflection magnetic field due to the toroidal winding coil (vertical deflection coil). The strength on the Z-axis of each deflection magnetic field of the saddle-wound coil (horizontal deflection coil) (the degree of attenuation on the neck side of the saddle-wound deflection field is usually large) I try to make them almost equal.

By the way, if the technique of the deflection yoke shown in FIG. 2 or 3 is applied to the deflection yoke shown in FIG. 4, it becomes difficult to correct the three types of misconvergence mentioned above. Further, in this case, it is necessary to select the length L to be larger than the case shown in FIG. 4, but if this is done, the horizontal deflection magnetic field on the neck side will also be weakened, and the significance of increasing L will be diminished. Furthermore, the horizontal deflection efficiency also decreases.

In view of these points, the present invention solves the problems shown in FIGS. 2 and 3 described above in a deflection yoke in which the horizontal deflection coil is wound in a saddle shape and the vertical deflection coil is wound in a toroidal manner. The purpose is to propose something that can correct raster distortion.

With reference to Figures 5, 6 and 7 below,
One embodiment of the deflection yoke according to the present invention will be described in detail, with the same reference numerals being given to parts corresponding to those in FIGS. 2 to 4 described above. In these figures, the horizontal and vertical central axes of the panel surface of the cathode ray tube are respectively the X-X' axis and the Y-X' axis, the tube axis is the Z axis,
Let O be the origin of these three axes. Water, Figure 7 is 5th
FIG. 7 is a cross-sectional view on the X-X' axis and the Y-Y' axis in FIG. This deflection yoke is constructed by winding a saddle-shaped horizontal deflection coil 3 and a toroidal-shaped vertical deflection coil 2 around a core 1. and,
This core 1 has a substantially truncated conical cylinder whose end on the neck side is aligned with the vertical center axis (Y-Y' axis) of the panel surface of the cathode ray tube.
The upper and lower notches 7, 7 are symmetrical to the horizontal center axis (X-X') of the panel surface at a predetermined angle and a predetermined length in the tube axis direction (Z-axis) of the cathode ray tube.
is formed, and vertical deflection coils 2 are wound in the upper and lower notches 7, 7, respectively, with a magnetic field distribution that forms a pink tension type magnetic field. The horizontal central axis (X-
Upper and lower auxiliary cores 6 arranged symmetrically with respect to the
It consists of 6. The notches 7, 7 have a substantially rectangular shape with a length l ₄ in the Z-axis direction and an angle θ ₂ +2θ ₃ . Therefore, the main core 5 has a predetermined angle θ ₁ {=180° − θ ₂ − 2θ ₃ } and a predetermined length l ₄ in the tube axis (Z-axis) direction of the cathode ray tube, the left and right substantially rectangular protrusions 8, 8 are symmetrical about the vertical central axis (Y-Y' axis) of the panel surface. has. The auxiliary cores 6, 6 have a substantially rectangular shape with a length l ₂ in the Z-axis direction and an angle θ ₂ . The auxiliary cores 6, 6 have a gap of width l ₃ in the Z-axis direction between the auxiliary cores 6, 6 and the notches 7, 7.
Further, the ends of the auxiliary cores 6, 6 on the neck side are provided with protrusions 8, 8.
It protrudes a length l ₁ from the end of the net toward the net. Incidentally, L is the length of the interval between the respective neck ends of the vertical and horizontal deflection coils 2 and 3.

The main core 5 can also be made by polishing sintered ferrite, but this increases the cost. In order to avoid this, as shown in FIG. 8, the protrusion 8 shown in FIG. Alternatively, it may be bonded. Further, when ferrite powder and resin powder are mixed and molded to form the main core 5 shown in FIG. 6 using a molded core, high costs can be similarly avoided.

By adjusting the above-mentioned L, l ₁ to _{l 4} and θ ₁ to _{θ 3} , the degree of the pink tension type and barrel type magnetic field of the vertical deflection magnetic field can be adjusted, and the range of the pink tension type and barrel type magnetic field in the Z-axis direction can be adjusted. , the relative strengths of the vertical and horizontal deflection fields on the neck side, and the three misconvergence correction adjustments as described with respect to FIG. 4, respectively.

According to the above-described deflection yoke of the present invention, the vertical deflection coil 2 is wound around the main core 5 so as to form a pink-tension type magnetic field, so the vertical deflection magnetic field becomes a pink-tension type magnetic field on the panel side.
On the neck side, due to the presence of the protrusions 8, the influence of the winding distribution is ignored, resulting in a barrel-shaped magnetic field as shown by the broken line in FIG.

Thus, according to the deflection yoke of the present invention, it is possible to correct left and right pink union type raster distortion. Further, according to the deflection yoke of the present invention, there is no need for a special winding machine as in the deflection yoke shown in FIG. There is no risk of the deflection yoke becoming large as in the deflection yoke shown in FIG.

Furthermore, according to the deflection yoke of the present invention, the degree of the pincushion type and barrel type magnetic field of the vertical deflection magnetic field,
The range in the Z-axis direction and the relative strength of the horizontal deflection magnetic field on the neck side can be easily adjusted.

Further, according to the present invention, the presence of the auxiliary core makes it possible to emphasize the extent of the barrel-shaped magnetic field on the neck side of the vertical deflection magnetic field, thereby increasing the difference from the extent of the pincussion-type magnetic field on the panel side.

Furthermore, as in the embodiment of the present invention described above, by providing a distance of an appropriate length L between the neck side end of the main core 5 and the neck side end of the horizontal deflection coil 3, the length of the cathode ray tube can be improved. Horizontal central axis of the panel surface (X-
Horizontal misconvergence on the vertical axis (X' axis), horizontal misconvergence on the vertical center axis (Y-Y' axis), and vertical misconvergence at corners are all corrected with a large degree of freedom. can do.

Furthermore, as in the embodiment of the present invention described above, the auxiliary core 6,
By protruding the neck side end of 6 by l ₁ , the effect of correcting the above-mentioned misconvergence is enhanced and the horizontal deflection efficiency is improved.

[Brief explanation of the drawing]

Figure 1 is a characteristic curve diagram showing the distribution of the vertical deflection magnetic field; Figures 2, 3 and 4 are side views, front views and side views of different conventional deflection yokes; Figures 5 and 6 are Different side views of one embodiment of the present invention, FIG. 7 shows the X-X′ axis and Y-axis of FIGS.
A sectional view along the Y' axis, and FIG. 8 is a side view of another embodiment of the present invention. 1 is a yoke, 2 is a vertical deflection coil, 3 is a horizontal deflection coil, 5 is a main core, 6, 6 is an auxiliary core, 7,
7 is a notch, and 8, 8 are protrusions.

Claims (1)

[Claims] 1. In a deflection yoke in which a saddle-shaped horizontal deflection coil and a toroidal-shaped vertical deflection coil are wound around a core, the core has a substantially truncated conical cylinder whose neck end is connected to a cathode ray tube panel. Upper and lower notches are formed symmetrically with respect to the horizontal central axis of the panel surface at a predetermined angle and a predetermined length in the tube axis direction of the cathode ray tube, and the upper and lower notches are symmetrical with respect to the horizontal central axis of the panel surface. The vertical deflection coils each have a main core wound with a winding distribution such as to form a pink tension magnetic field, and a main core located in the upper and lower notches, with a predetermined gap between them and the edges of the upper and lower notches. A deflection yoke comprising upper and lower auxiliary cores arranged symmetrically with respect to the horizontal central axis.