JPH09306381A - Deflection yoke device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make deflection sensitivity equal to that of a horizontal deflection coil, and reduce miss convergence of a cathode-ray tube having a large image screen and a wide deflection angle by elongating an electron gun side part of a vertical deflection coil, and forming a diametrically contracted elongated small diameter part on the inside diameter side. SOLUTION: A deflection yoke A is constituted by symmetrically arranging a horizontal delection coil 5h, a vertical deflection coil 5v and a conical core 6 from inside to the Z axis 20 connecting the center of an electron gun and the center of a fluorescent screen. In the circular arc-shaped vertical deflection coil 5v, the electron gun side in the lengthwise direction is brought near by one stage to the Z axis 20 similarly to the horizontal deflection coil 5h by forming an elongated small diameter part 11 in a part close to the Z axis 20 side. Vertical deflection sensitivity is improved by this elongated small diameter part 11, and is set to deflection sensitivity corresponding to deflection sensitivity of the horizontal deflection coil by adjusting its length, and a magnetic filed component in the diagonal direction is put in a tendency of a pin cushion magnetic field. Therefore, a deflection characteristic coincident even with a cathode-ray tube having a large image screen and a wide deflection angle can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device to be combined with a cathode ray tube used for displays such as television receivers, personal computers and word processors.

[0002]

2. Description of the Related Art In recent years, cathode ray tube devices have been widely used for displays of television receivers, personal computers and word processors. Hereinafter, the cathode ray tube device will be described in detail with reference to the half-cut side view of FIG.

Generally, a cathode ray tube B used in a cathode ray tube device has a funnel shape, and has an electron gun 1 at its base and a fluorescent screen 2 at its maximum diameter portion.

A deflection yoke device A is installed on the cathode ray tube B. The deflection yoke device A is composed of an inner horizontal deflection coil 5h, an outer vertical deflection coil 5v, and a conical core 6 on the outer side thereof.

The electron beam 3 emitted from the electron gun 1 is deflected by the deflection magnetic field generated by the deflection yoke device A.
That is, the horizontal deflection coil 5h located inside is deflected in the left-right direction, the vertical deflection coil 5v located outside is deflected in the up-down direction, and the electron beam 3 is directed to the phosphor screen 2 through a shadow mask (not shown). The image is projected by the scanning locus of the electron beam 3 on the phosphor screen 2 when it is reached. A conventional example of the deflection yoke device A which is used in this way will be described below.

A conventional deflection yoke device to be combined with a cathode ray tube is disclosed in Japanese Patent Application Laid-Open No. 6-60825. A semi-cut side view of the deflection yoke device A is shown in FIG.

Here, 5h is a horizontal deflection coil, 5v is a vertical deflection coil, and 6 is a conical core.

As shown in FIG. 9, in the deflection yoke device A, the vertical deflection coil 5v is provided outside the horizontal deflection coil 5h.
And the conical core 6 is arranged outside thereof. The vertical deflection coil 5v is the horizontal deflection coil 5h.
The vertical deflection coil 5v is located within the length range of the horizontal deflection coil 5h.

[0009]

Generally, when an electron beam is to be deflected by a deflection magnetic field, the fact that the deflection coil, which is the mother body of the deflection magnetic field, should be closer to the electron beam is more efficient, for example, Biot Savart. Are known for their laws.

However, in the deflection yoke device A configured as described above, since the vertical deflection coil 5v is located outside the horizontal deflection coil 5h at any position, the deflection sensitivity of the vertical deflection coil 5v is horizontal deflection. It is lower than the deflection sensitivity of the coil 5h.

As described above, since the vertical deflection coil 5v has a lower deflection sensitivity than the horizontal deflection coil 5h, as the cathode ray tube has a large screen and a wide deflection angle, the misconvergence which influences the screen quality of the cathode ray tube. The amount increases.

For example, in the cathode ray tube screen 7 of FIG. 10, a locus 8 of a horizontal red electron beam called PQv.
And the degree of separation of the locus 9 of the Blue electron beam (when this amount is small, the color shift is small and the image quality is easy to see), the misconvergence amount is 0.2 mm or less in a 16-inch 90-degree deflection cathode ray tube screen. In contrast,
In a 29-inch 110 ° -deflected cathode ray tube screen, the amount of misconvergence increases to 6.4 mm.

It is an object of the present invention to solve the above-mentioned conventional problems and to provide a deflection yoke device capable of obtaining desired characteristics even if the cathode ray tube has a large screen and a wide deflection angle. I am trying.

[0014]

In a deflection yoke device according to the present invention, a vertical deflection coil is arranged outside a horizontal deflection coil, and an electron gun side portion of the vertical deflection coil is extended to the electron gun side. It is characterized in that it is formed in a small expanded diameter portion that is reduced in diameter on the inner diameter side. Since the vertical deflection coil is brought closer to the inner side at the part where the extension diameter is small, the deflection sensitivity of the vertical deflection coil can be made comparable to that of the horizontal deflection coil (in some cases, it can be made larger), and the large screen The amount of misconvergence of the cathode ray tube at a wide deflection angle can be reduced, and the sensitivity difference between the deflection sensitivity of the vertical deflection coil and that of the horizontal deflection coil can be adjusted to match the target cathode ray tube device. The characteristics of the deflection yoke device described above can be obtained.

[0015]

A deflection yoke device according to a first aspect of the present invention is a deflection device including a horizontal deflection coil mounted outside a cathode ray tube and a vertical deflection coil disposed outside the horizontal deflection coil. The yoke device is characterized in that an electron gun side portion of the vertical deflection coil is formed in a small extension diameter portion extended to the electron gun side and reduced in diameter to the inner diameter side. Since the vertical deflection coil is brought closer to the inner side at the part where the extension diameter is small, the deflection sensitivity of the vertical deflection coil can be made comparable to that of the horizontal deflection coil (in some cases, it can be made larger), and the large screen The amount of misconvergence of the cathode ray tube at a wide deflection angle can be reduced. Further, by adjusting the sensitivity difference between the deflection sensitivity of the vertical deflection coil and the deflection sensitivity of the horizontal deflection coil, it is possible to obtain the characteristic of the deflection yoke device that matches the target cathode ray tube device.

A deflection yoke device according to a second aspect of the present invention is the deflection yoke device according to the first aspect, wherein the fluorescent screen side end portion of at least one of the vertical deflection coil and the horizontal deflection coil is located with respect to the axis. It is characterized in that it is formed in a vertical rising portion that rises vertically outwards. Even if manufacturing variations occur, the length on the phosphor screen side can be regulated to a certain length, and the length of each deflection coil can be surely suppressed, so that the deflection sensitivity is closely related to the length of the deflection coil. Can be kept within a certain range,
The deflection sensitivity of the horizontal deflection coil or the vertical deflection coil can be adjusted to obtain the characteristics of the deflection yoke device that match the target cathode ray tube device.

A deflection yoke device according to a third aspect of the present invention is the deflection yoke device according to the first or second aspect, further comprising a core arranged outside the horizontal deflection coil and further outside the vertical deflection coil. It is characterized in that it is divided into a conical core corresponding to the main body portion of the vertical deflection coil and a cylindrical core corresponding to the small extension diameter portion. The ferrite used for the core is a type of ceramics product, and if the shape is complicated, variations in manufacturing will increase, but since the core is divided into two as described above, both the conical core and the cylindrical core have the same shape. Is simplified, variations in manufacturing thereof are reduced, and a deflection yoke device having uniform characteristics can be manufactured.

Embodiments of a deflection yoke device according to the present invention will be described below with reference to the drawings. The same components as those described in the above-mentioned conventional example are designated by the same reference numerals, and the description thereof will be omitted.

(Embodiment 1) FIG. 1 is an external view of a vertical deflection coil 5v of a deflection yoke device A according to Embodiment 1 of the present invention. In FIG. 1, 11 is a vertical deflection coil 5v.
Is a small extension diameter portion which is extended to the cathode ray tube electron gun side with respect to the horizontal deflection coil 5h and has a reduced diameter. In the vertical deflection coil 5v, a portion other than the extension small diameter portion 11 is a main body portion 12.

That is, the vertical deflection coil 5v supplies a deflection current to generate a deflection magnetic field, and the portions of the deflection magnetic field that contribute to the deflection of the electron beam are two longitudinal portions 13a and 13b facing each other. . This longitudinal portion 13
a and 13b are the large diameter side (phosphor side) and the crossover part 1
4a, and a crossover portion 14b on the small diameter side (electron gun side). The outer diameter of the portion near the crossover portion 14b on the small diameter portion side is generally reduced to form the extended small diameter portion 11.

The shape of the deflection yoke device according to the first embodiment will be described in detail below. First, regarding the shape on the electron gun side, this portion is the longitudinal portion 13 of the main body portion 12.
It is formed one size smaller than a and 13b, but this portion is formed at one location of the electron gun side connecting wire portion 14b and the longitudinal portion 13.
a ₁ and 13 b ₁ , and the longitudinal portion 13 a
₁ , 13b ₁ are formed substantially parallel to each other. Further, the portions connecting the longitudinal portions 13a ₁ and 13b ₁ and the electron gun side connecting wire portion 14b are formed substantially at right angles. This portion is the above-mentioned small extension diameter portion 11 which is a feature of the present invention.

A continuous connecting portion 15 is provided which is connected to the small extension diameter portion 11 and is connected to the longitudinal portions 13a and 13b of the main body portion 12 extending in the outer diameter direction. The longitudinal direction portions 13a and 13b of the main body portion 12 are connected in series from the maximum diameter portion of the connection portion 15. Also, the longitudinal portion 1 of the body portion 12
A phosphor screen side connecting line portion 14a is continuously provided from the maximum diameter portion of 3a and 13b.

Regarding the continuous portion 15 for connecting the small extension diameter portion 11 and the main body portion 12 in the vertical deflection coil 5v,
Additional description will be given with reference to the front view of FIG. As shown in the figure, the vertical deflection coil 5v is constituted by two identical deflection coils 5v ₁ disposed on the left and right.

The inner diameter of the extended diameter small portion 11 is approximately 0.5 mm to approximately the maximum outer diameter of the glass along the outer diameter of the glass of the cathode ray tube neck portion 16 in consideration of manufacturing variations.
It is formed to be slightly larger than 1 mm. The outer diameter is determined in consideration of the body cross-sectional area of the vertical deflection coil 5v (approximately 32 mm ^{2 to} 48 mm ² ). In this way, the small inner diameter portion is formed, and the connecting portion 1 for connecting with the main body portion 12 is formed.
No. 5 is provided, the structure of this portion is such that the inside is formed so that the window portion 17 which is a portion where the electric wire of the small inner diameter portion is not wound and the window portion 18 of the main body portion 12 are connected by a straight line, A portion called a surface 19 is formed on the same surface as the small inner diameter portion and the main body portion 12. Windows 17, 18 and press surface 19
The wire is wound almost radially between and and the vertical deflection coil 5
construct v.

Next, the arrangement of the vertical deflection coil 5v thus constructed will be described with reference to FIG. FIG. 3 is a sectional view of a deflection yoke device A using the vertical deflection coil 5v. As shown in this figure, each deflection coil of the deflection yoke device A of the first embodiment is arranged symmetrically with respect to the Z axis 20 which is a straight line connecting the center of the electron gun of the cathode ray tube and the center of the fluorescent screen, and The horizontal deflection coil 5h is arranged first from the inner side close to the Z-axis 20, the vertical deflection coil 5v is arranged on the outer side, and the conical core 6 is arranged on the outer side. In the deflection yoke device A thus arranged and arranged, the vertical deflection coil 5v of the first embodiment will be described in detail below.

That is, the vertical deflection coil 5v of the first embodiment has an arc shape centered on the Z axis 20 and has longitudinal portions 13a and 13b and crossover portions 14a and 14b. The electron gun side longitudinal portions 13a ₁ and 13b _{1 of the} portions 13a and 13b are the other longitudinal portions 13a ₁ and 13b ₁ , respectively.
A small extension diameter portion 11 is formed as a portion closer to the Z axis 20 side than the a and 13b. The small extension diameter portion 11 is formed in an arc having substantially the same radius as the inner diameter of the horizontal deflection coil 5h. That is, the small extension diameter portion 11 of the vertical deflection coil 5 v is the horizontal deflection coil 5 with respect to the Z axis 20.
It can be seen that they are located sufficiently close to each other as with h. The small extension diameter portion 11 serves to improve the deflection sensitivity of the vertical deflection coil 5v. The convergence characteristic of the deflection yoke device A for the cathode ray tube is the horizontal deflection coil 5h.
And the vertical deflection coil 5v.

Generally, in a cathode ray tube equipped with a so-called in-line gun in which electron guns for horizontally emitting electron beams are arranged in a row, the magnetic field component of the horizontal deflection magnetic field generated by the horizontal deflection coil 5h is a pin cushion as shown in FIG. A magnetic field (that is, the magnetic field line 21 shown by a broken line is a pincushion type),
The magnetic field component of the vertical deflection magnetic field generated by the vertical deflection coil 5v is a barrel magnetic field as shown in FIG. 5 (that is, the magnetic field line 22 shown by the broken line is barrel-shaped).

The deflection magnetic field used for the in-line gun is
What is the desired magnetic field in the diagonal direction. Generally, a barrel magnetic field is required as the screen becomes smaller and the deflection angle becomes smaller, and a pincushion magnetic field becomes necessary as the screen becomes wider and the deflection angle becomes wider.

As for the relationship between the deflection sensitivity and the magnetic field component generated in the diagonal direction, if the deflection sensitivity is good, the magnetic field component of that portion will be weak, and conversely, if it is poor, the magnetic field component of that portion will be strong. In other words, when the deflection sensitivity of the horizontal deflection coil 5h is improved, the pincushion magnetic field is weakened in the diagonal magnetic field component, and when the deflection sensitivity of the vertical deflection coil 5v is improved, the barrel magnetic field is weakened in the diagonal magnetic field component.

That is, by adjusting the length of the small extension diameter portion 11 located on the electron gun side of the vertical deflection coil 5v of the first embodiment, the deflection sensitivity of the vertical deflection coil 5v is improved. This means that the magnetic field component in the diagonal direction can be made to have a pincushion magnetic field tendency. In the conventional example, since the diagonal direction requires a pincushion magnetic field component, it is not possible to cope with a large screen and a wide deflection angle. The cathode ray tube device, which was possible, is now fully compatible.

Table 1 shows the amount of change in the length of the small extension diameter portion 11 and the misconvergence PQv of the cathode ray tube device on a 110 ° / 24 inch screen.

[0032]

[Table 1]

(Second Embodiment) FIG. 6 is a sectional view showing a deflection yoke device A according to a second embodiment. In this figure, the fluorescent screen side connecting line portion 23a of the horizontal deflection coil 5h and the fluorescent screen crossover line portion 14a of the vertical deflection coil 5v have their fluorescent screen side portions perpendicular to the Z axis 20 (90 °).
It is formed on the vertical rising portions 23a and 14c which stand.

In the deflection coil constructed as described above, the length on the phosphor screen side can be regulated to a certain length even if manufacturing variations occur, and the length of each deflection coil can be reliably suppressed. Therefore, the deflection sensitivity, which is closely related to the length of the deflection coil, can be suppressed to a certain range, and the magnitude of the deflection sensitivity of the horizontal deflection coil 5h and the vertical deflection coil 5v is established through this. It will be.

That is, the value of the PQv of the misconvergence amount of the screen of the cathode ray tube can be fixed once the setting is determined, so that the optimum setting and mass production are possible.

The external appearance of the vertical deflection coil 5v thus constructed is as shown in FIG.

(Third Embodiment) FIG. 7 is a perspective view showing the appearance of a core according to the third embodiment. As shown in this figure, the core 6 made of magnetic material such as ferrite is divided into two,
One is a conical core 6a which is formed in a substantially conical shape so as to cover the deflection yoke main body portion, and the other is a cylindrical core 6b which is formed in a substantially cylindrical shape so as to cover the extension small diameter portion 11. Has been done. The conical core 6a and the cylindrical core 6b are shown in FIGS.

In general, the function of the core is to cause the magnetic field lines, which do not contribute to the deflection of the electron beam emitted from the electron gun of the cathode ray tube, of the deflection magnetic field diverged from the deflection coil, to be applied to the inside of the core, which is a magnetic body, and the magnetic field lines thereof. To strengthen the deflection magnetic field. For that purpose, the inner diameter of the core should be as small as possible so as to come close to the deflection coil.

Generally, the ferrite used for the core is a kind of ceramic product, and if the shape is complicated, the variation in manufacturing becomes large. Therefore, by dividing the core into two as in the third embodiment, the shapes of the conical core 6a and the cylindrical core 6b can be simplified, the manufacturing variations can be reduced, and the deflection yoke having uniform characteristics can be obtained. The device can be produced.

In the third embodiment, the core is divided into two parts to suppress manufacturing variations. However, when the core is used as a deflection yoke device, the divided conical core 6a is divided into two parts. The cylindrical core 6b and the cylindrical core 6b may be integrally fixed with an adhesive or the like for use.

[0041]

According to the deflection yoke device of the present invention,
Since the vertical deflection coil is brought closer to the inner side at the part where the extension diameter is small, the deflection sensitivity of the vertical deflection coil can be made comparable to that of the horizontal deflection coil (in some cases, it can be made larger), and the large screen The amount of misconvergence of the cathode ray tube at a wide deflection angle can be reduced, and the sensitivity difference between the deflection sensitivity of the vertical deflection coil and the deflection sensitivity of the horizontal deflection coil can be adjusted to match the target cathode ray tube device. The characteristics of the deflection yoke device can be obtained. Further, since the end of the deflection coil on the phosphor screen side is formed in the vertical rising portion, the length on the phosphor screen side can be regulated to a certain length even if manufacturing variations occur. Since the deflection sensitivity, which is closely related to the deflection coil length, can be suppressed within a certain range by reliably suppressing the length of the deflection coil, the deflection sensitivity of the horizontal deflection coil or the vertical deflection coil can be adjusted to It is possible to obtain the characteristic of the deflection yoke device that matches the cathode ray tube device. Further, since the outer core of the vertical deflection coil is separated into a conical core corresponding to the main body of the vertical deflection coil and a cylindrical core corresponding to the small extension diameter portion, it is more convenient to manufacture than a single core. Of the deflection yoke device with uniform characteristics can be produced.

[Brief description of drawings]

FIG. 1 is an external view of a vertical deflection coil of a deflection yoke device according to a first embodiment of the present invention.

FIG. 2 is a front view of a combination state of a pair of vertical deflection coils viewed from the electron gun side in the first embodiment.

FIG. 3 is a sectional view showing a deflection yoke device using the vertical deflection coil in the first embodiment.

FIG. 4 is a diagram showing a pincushion magnetic field component of a horizontal deflection coil.

FIG. 5 is a diagram showing barrel magnetic field components of a vertical deflection coil.

FIG. 6 is a sectional view showing a deflection yoke device according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a two-divided core of a deflection yoke device according to a third embodiment of the present invention.

FIG. 8 is a half-cut side view of a conventional cathode ray tube device.

FIG. 9 is a half-cut side view of a conventional deflection yoke device.

FIG. 10 is a display state diagram showing misconvergence that occurs on a cathode ray tube screen in the related art.

[Explanation of symbols]

 A ... Deflection yoke device B ... Cathode ray tube 1 ... Electron gun 2 ... Phosphor screen 3 ... Electron beam 5h ... Horizontal deflection coil 5v ... Vertical deflection coil 6 ... Conical core 6a ... Conical core 6b ... Cylinder -Shaped core 11 ... small extension diameter portion 12 ... main body portion 13a, 13b ... longitudinal direction portion 14a, 14b ... crossover portion 14c ... vertical rising portion 15 ... main body portion and small extension diameter portion are continuously provided Consecutive part 16 …… Negative part of cathode ray tube 17 …… Window part 18 …… Window part 19 …… Press surface 23a …… Vertical rising part

Claims (3)

[Claims] 1. A deflection yoke device comprising a horizontal deflection coil mounted on the outside of a cathode ray tube and a vertical deflection coil arranged outside of the horizontal deflection coil, wherein an electron gun side portion of the vertical deflection coil. Is formed in a small extension diameter portion which is extended to the electron gun side and is reduced in diameter to the inner diameter side. 2. A fluorescent screen side end of at least one of the vertical deflection coil and the horizontal deflection coil is formed in a vertical rising portion that rises vertically outward with respect to the axis. The deflection yoke device according to claim 1, wherein: 3. A core disposed outside the horizontal deflection coil and further outside the vertical deflection coil, the core corresponding to the conical core corresponding to the main body portion of the vertical deflection coil and the small extension diameter portion. The deflection yoke device according to claim 1 or 2, wherein the deflection yoke device is separated into a cylindrical core.