JP2000036265A - Deflection yoke and cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose a deflection yoke and a cathode-ray tube device in which change of a magnetic field distribution or turbulence of a convergence characteristic or the like is prevented by preventing loosening of saddle-shaped deflection coils. SOLUTION: Concerning a deflection yoke 19 mounted on the outside of a cathode-ray tube, a projection part 24 for fixing electron gun side end parts of deflection coils 20H, 20V is installed on a mold 21 for supporting the deflection coils 20H, 20V, and the projection part 24 is formed so as to have the height higher than the thickness of the electron gun side end parts of the deflection coils 20H, 20V. Hereby, even if the deflection coils 20H, 20V have a formation having little deflection sensitivity, disentanglement of the coils can be prevented by fixation by the projection part 24, and change of a magnetic field distribution caused by the loosening of the coils can be prevented. Besides, by applying to a color image receiving tube, turbulence of the convergence characteristic or the like can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke and a cathode ray tube device, and more particularly to a deflection yoke and a cathode ray tube device in which a rear portion of a saddle type deflection coil is prevented from loosening.

[0002]

2. Description of the Related Art Generally, in a cathode ray tube device, a deflection yoke is mounted outside a funnel-shaped funnel constituting an envelope of the cathode ray tube, and a horizontal and vertical deflection magnetic field generated by the deflection yoke causes the inside of the funnel neck. A structure for displaying an image by deflecting an electron beam emitted from an arranged electron gun and horizontally and vertically scanning a phosphor screen provided on an inner surface of a panel constituting an envelope together with the funnel. Is formed.

The deflection yoke includes a horizontal deflection coil for horizontally deflecting the electron beam emitted from the electron gun,
It comprises a vertical deflection coil that deflects in the vertical direction, a mold that supports these horizontal and vertical deflection coils, and a trapezoidal cylindrical core. As such a deflection yoke, a saddle / saddle type deflection yoke in which the horizontal and vertical deflection coils are both saddle type, and a semi-toroidal type deflection yoke in which the horizontal deflection coil is a saddle type and the vertical deflection coil is a toroidal type are often used. ing.

Conventionally, as the saddle type deflection coil,
As shown in FIG. 3, a mold winding deflection coil 2a formed by winding a self-fusing wire 1a into a gap of a mold called a winding form, and as shown in FIG. A slot winding deflection coil 2b formed by winding the wire rod 1b into the slot portion 4 of the corresponding funnel-shaped coil bobbin 3.
There is. Usually, each of these saddle type deflection coils has a bend portion (not shown) rising from the parallel line portion 5 at the front portion and the rear portion.

[0005] Of the two types of deflection coils 2a and 2b having different winding methods, the slot winding deflection coil 2b has less variation in coil winding distribution and emits a plurality of beams as compared with the mold winding deflection coil 2a. By applying the present invention to a deflection yoke of a color picture tube, it is possible to reduce convergence disturbance and the like, and to easily obtain a desired winding distribution of the coil.

However, the horizontal deflection coil consumes more power than the vertical deflection coil, and is usually arranged inside the mold to save power. In the case of the slot winding deflection coil 2b, however, it is arranged inside the mold. Also, since the wire rod 1b is wound inside the slot portion 4, a gap is formed between the slot 1 and the outer surface of the funnel, and the distance from the trajectory of the electron beam becomes longer. )Become. On the other hand, the mold-winding deflection coil 2a does not have the slot portion 4 like the slot-winding deflection coil 2b and can be arranged close to the trajectory of the electron beam. Can be reduced). That is, in terms of power consumption, the mold-winding deflection coil 2a is more powerful than the slot-winding deflection coil 2b.
Is better.

On the other hand, in order to reduce the horizontal deflection sensitivity of the horizontal deflection coil, the rear bend portion is tilted, and the rear crossover portion 7 is positioned substantially on the same plane as the parallel line portion 5 as shown in FIG. There is a bendless winding type deflection coil 2c. In the case of such a bendless winding form, in the case of the deflection coil having the above-described bend portion, the deflection sensitivity needs to be increased because the deflection center is located at the front portion where the coil is located away from the trajectory of the electron beam. In the case of a bendless winding type, the deflection sensitivity can be reduced by moving the deflection center behind the coil approaching the trajectory of the electron beam, and the power consumption can be reduced.

[0008]

As described above, conventionally,
The saddle-type horizontal deflection coil of the deflection yoke attached to the cathode ray tube has a mold winding deflection coil formed by winding a self-fusing wire into the gap between the molds, and a funnel corresponding to the outer shape of the funnel. There is a slot-winding deflection coil formed by winding a wire into a slot portion of a coil bobbin having a shape.

The mold-wound deflection coil has the advantage that the power required for horizontal deflection can be reduced as compared with the slot-wound deflection coil, but the coil winding distribution has a greater variation than the slot-wound deflection coil. In addition, when applied to a deflection yoke of a color picture tube that emits a plurality of beams due to the coil being easily loosened, convergence is likely to be disturbed. On the other hand, slot-winding deflection coils can reduce the variation in coil winding distribution compared to mold-winding deflection coils, and can be applied to the deflection yoke of a color picture tube that emits multiple beams to reduce convergence disturbances. In addition, the winding distribution of the coil can be easily set to a predetermined distribution. However, since the wire is wound inside the slot portion and the distance from the trajectory of the electron beam increases, the power required for horizontal deflection increases.

For this reason, when importance is placed on the horizontal deflection sensitivity, a mold-wound deflection coil is advantageous, and the rear bend portion is defeated so that the rear crossover portion is positioned substantially on the same plane as the parallel line portion. In this case, it is preferable to use a bendless winding type in which the deflection center can be moved rearward of the deflection coil having the rear bend.

However, if the horizontal deflection coil is wound by a mold and a bendless winding, when the deflection yoke is mounted on the cathode ray tube, the tape wound around the rear end of the tape to protect the stem pin and the neck at the end of the neck. And the coil is loosened, and a desired magnetic field distribution cannot be obtained. Further, in the case of a color picture tube, there is a problem that convergence characteristics may be disturbed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a deflection yoke and a cathode ray tube device which make it difficult for a saddle type deflection coil to be loosened and for disturbances such as changes in magnetic field distribution and convergence characteristics to occur. It is intended to constitute.

[0013]

A deflection yoke which has a saddle type deflection coil for deflecting an electron beam emitted from an electron gun of a cathode ray tube and a mold for supporting the deflection coil, and which is mounted outside the cathode ray tube. In the above, the mold was provided with a projection for locking the electron gun side end of the deflection coil, and the projection was formed at a height higher than the thickness of the electron gun side end of the deflection coil.

The deflection coil is a coil manufactured by winding a metal mold.

Furthermore, a saddle type tube having a cathode ray tube having an electron gun disposed in the neck of the funnel and a deflection yoke mounted outside the funnel, wherein the deflection yoke deflects an electron beam emitted from the electron gun. In a cathode ray tube device having a deflection coil and a mold supporting the deflection coil, a projection for locking an end of the deflection coil on the electron gun side is provided on a mold of the deflection yoke, and the projection is disposed on the electron gun side of the deflection coil. It was formed at a height not less than the thickness of the end.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a color picture tube device which is one embodiment of the present invention. This color picture tube device has an envelope composed of a panel 10 and a funnel 11 having a funnel shape, and a phosphor screen 12 composed of a three-color phosphor layer emitting blue, green and red light is provided on the inner surface of the panel 10. And a shadow mask 1 inside the phosphor screen 12.
3 are arranged. On the other hand, the neck 1 of the funnel 11
An electron gun 16 that emits three electron beams 15B, 15G, and 15R is disposed in 4. A deflection yoke 19 described below is mounted from the large diameter portion 17 of the funnel 11 to the portion adjacent to the neck 14. The three electron beams 15B, 15G, and 15R emitted from the electron gun 16 are deflected by the magnetic field generated by the deflection yoke 19, and the phosphor screen 12 is horizontally and vertically scanned through the shadow mask 13, thereby providing color. It is formed in a structure for displaying an image.

The deflection yoke 19 comprises a pair of saddle type horizontal deflection coils 20H for generating a magnetic field for horizontally deflecting the three electron beams 15B, 15G, 15R emitted from the electron gun 16, and a magnetic field for vertically deflecting. And a pair of saddle type vertical deflection coils 20V for generating
9, a mold 21 which is formed in a cylindrical shape corresponding to the outer shape of the large diameter portion 17 of the funnel 11 to the portion adjacent to the neck 14 and supports the horizontal and vertical deflection coils 20H and 20V, and a pair of vertical deflection coils. And a trapezoidal tubular core 22 disposed outside the 20V parallel line portion. The horizontal deflection coil 20H is supported inside the mold 21, and the vertical deflection coil 20V is supported outside.

Particularly, in this embodiment, the pair of horizontal deflection coils 20H are formed in a bendless winding type in which a rear crossover portion located on the electron gun 16 side is located substantially on the same plane as the parallel line portion. The rear crossover portion is formed in a U-shape.

Further, a pair of protrusions 24 are formed on the inner side of the rear portion of the mold 21 so as to project toward the central axis of the mold 21. As shown in FIG.
Each horizontal deflection coil 20 formed in the bendless winding form
H is formed to have a height h equal to or greater than the thickness of the U-shaped rear crossover portion 25 and is locked to the rear crossover portion 25.

When the projection 24 is provided inside the rear portion of the mold 21 as described above, the horizontal deflection coil 20H is formed into a bendless winding type and is wound around a mold so that the horizontal deflection coil 20H can be locked even if the horizontal deflection sensitivity is reduced. Thus, it is possible to prevent the coil from loosening, and it is possible to eliminate the change in the magnetic field distribution due to the coil loosening and the disturbance of the convergence characteristic of the color picture tube.

That is, generally, a mold winding deflection coil is
When the deflection yoke 19 is mounted on the color picture tube, the stem pin 27 (see FIG. 1) and the neck 14 are protected when the deflection yoke 19 is mounted on the color picture tube. Although the rear connecting wire portion is caught on the tape wound around the coil, the coil is easily loosened. However, when the projection 24 is provided and the rear connecting wire portion is locked as in this embodiment, it is difficult for the rear connecting wire portion to be loosened. Therefore, it is possible to eliminate a change in the magnetic field distribution due to the loosening of the coil and a disturbance in the convergence characteristics of the color picture tube.

In the above embodiment, one projection is provided for each pair of saddle-type horizontal deflection coils. However, one projection is provided for each pair of horizontal deflection coils. The above may be provided. In addition, the formation position is not limited to the U-shaped portion of the rear crossover portion of the bendless-wound horizontal deflection coil, but is provided at a position where the winding distribution of the coil is optimally retained and is locked to the coil. Is also good.
By forming the protrusions in this manner, it is possible to provide a deflection yoke that makes it difficult for the rear crossover portion to be loosened and that maintains an optimum magnetic field distribution.

Further, in the above-described embodiment, the projection is provided for the bendless winding type deflection coil. However, this projection can be applied to deflection coils other than the bendless winding type.

In the above embodiment, the deflection yoke and the color picture tube device mounted on the color picture tube have been described. However, the present invention is directed to a deflection yoke and a cathode ray tube mounted on a cathode ray tube other than the color picture tube device. It can also be applied to pipe devices.

[0026]

As described above, the mold for supporting the deflection coil is provided with the projection for locking the end of the deflection coil on the electron gun side, and this projection is larger than the thickness of the electron gun side end of the deflection coil. When the deflecting coil is formed at a height of even if the deflecting coil has a structure with a low deflection sensitivity, it is possible to prevent the coil from being loosened by the locking of the projections, and to prevent a change in the magnetic field distribution due to the coil being loosened. Further, by applying the present invention to a color picture tube, it is possible to eliminate the disturbance of the convergence characteristic.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a color picture tube device according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing a relationship between a horizontal deflection coil of a deflection yoke mounted on the color picture tube device and a projection; FIG.

FIG. 3 is an explanatory view of a conventional mold-winding deflection coil.

FIG. 4 is an explanatory view of a conventional slot winding deflection coil.

FIG. 5 is a diagram showing a configuration of a conventional bendless winding deflection coil.

[Explanation of symbols]

 15B, 15G, 15R ... 3 electron beams 16 ... electron gun 19 ... deflection yoke 20H ... horizontal deflection coil 20V ... vertical deflection coil 21 ... mold 24 ... projection 25 ... rear crossover part

Claims (3)

[Claims] 1. A deflection yoke which has a saddle type deflection coil for deflecting an electron beam emitted from an electron gun of a cathode ray tube and a mold for supporting the deflection coil, and is mounted outside the cathode ray tube, The mold is provided with a projection for locking the electron gun side end of the deflection coil, and the projection is formed at a height equal to or greater than the thickness of the electron gun side end of the deflection coil. Deflection yoke. 2. The deflection yoke according to claim 1, wherein the deflection coil is a coil manufactured by winding a die. 3. A cathode ray tube having an electron gun disposed in a neck of a funnel and a deflection yoke mounted outside the funnel, and the deflection yoke deflects an electron beam emitted from the electron gun. In a cathode ray tube device having a saddle type deflection coil and a mold for supporting the deflection coil, a projection for locking an electron gun side end of the deflection coil is provided on the deflection yoke mold, and the projection is formed as described above. A cathode ray tube device, wherein the height of the deflection coil is equal to or greater than the thickness of the electron gun side end.