JPH0855586A - Color cathode-ray tube device - Google Patents

Abstract

PURPOSE:To make the voltage about 1/2 the conventional voltage and provide an inexpensive color cathode-ray tube device by setting opposite phases for the dynamic voltages of two voltage application means which produce a non- axisymmetric lens field between the two auxiliary electrodes. CONSTITUTION:Cathodes 3a, 3b, 3c, a control grid electrode 4, an accelerating electrode 5, a focusing electrode 6, a first auxiliary electrode 7, a second auxiliary electrode 8, and a final accelerating electrode 9 are arranged in that order. A first voltage application means 14, and second and third voltage application means 15, 16 are provided to produce a first non-axisymmetric lens field that converges horizontally and diverges vertically, between the opposite end faces of the electrodes 7, 8. The means 15, 16 are made to produce dynamic voltages of opposite phases, so that even if their voltages are reduced to about 1/2 of conventional dynamic voltage, a non-axisymmetric lens field can be produced between the electrodes 7, 8. Therefore, a low-voltage, inexpensive drive circuit can be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube device used for televisions and displays.

[0002]

2. Description of the Related Art A conventional color cathode ray tube device is provided in order to obtain high resolution in the peripheral portion of the phosphor screen surface.
A cathode, a control grid electrode, an accelerating electrode, a first auxiliary electrode, a second auxiliary electrode, and a final accelerating electrode are sequentially arranged, and one of the facing end faces of the first auxiliary electrode and the second auxiliary electrode is provided. A constant focusing voltage is applied, and a dynamic voltage gradually decreasing or rising from the constant focusing voltage is applied to the other auxiliary electrode as the beam deflection amount increases.
An electron beam passage hole is formed in at least one of the auxiliary electrode and the second auxiliary electrode in an axially asymmetric shape (Japanese Patent Laid-Open No. 192252/1983).

[0003]

However, in such a conventional color cathode ray tube device, at least one of the first auxiliary electrode and the second auxiliary electrode has an electron beam passage hole having an axially asymmetrical shape and is of a focusing type. Since the axially asymmetric lens electric field is generated, there is a problem that a dynamic voltage becomes high, an inexpensive semiconductor having a low voltage cannot be used, and a driving circuit becomes expensive.

The present invention provides a dynamic voltage of about 1
It is intended to provide an inexpensive color cathode ray tube device that is reduced to 1/2.

[0005]

A color cathode ray tube device of the present invention comprises a cathode, a control grid electrode, an accelerating electrode, a focusing electrode, a first auxiliary electrode, a second auxiliary electrode and a final accelerating electrode, which are arranged in this order. The first auxiliary electrode and the second auxiliary electrode are provided with first axially asymmetric lens electric field generating means, which are horizontally converging type and vertically diverging type, on opposite end faces of the first auxiliary electrode and the second auxiliary electrode. First voltage applying means for applying a constant focusing voltage to the second auxiliary electrode is provided, and the first voltage applying means descends between the first auxiliary electrode and the first voltage applying means in response to an increase in the deflection angle of the electron beam. And a second voltage applying means for applying a dynamic voltage to the second auxiliary electrode and the first auxiliary electrode.
A third voltage applying means for applying a dynamic voltage that rises in response to an increase in the deflection angle of the electron beam is provided between the third voltage applying means and the voltage applying means.

[0006]

With this structure, the second voltage applying means and the third voltage applying means
Since the dynamic voltage of the second voltage applying means and that of the third voltage applying means are opposite to those of the first voltage applying means, the respective voltages of the second voltage applying means and the third voltage applying means are set to about ½ of the conventional dynamic voltage. Between the auxiliary electrode and the second auxiliary electrode,
An axially asymmetric lens electric field can be generated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

In the color cathode ray tube device of the present invention, as shown in FIGS. 1 and 2, in the neck portion 2 which constitutes one end of the glass bulb 1, the cathodes 3 are arranged inline in the horizontal direction.
It has an electron gun 10 in which a, 3b, 3c, a control grid electrode 4, an acceleration electrode 5, a focusing electrode 6, a first auxiliary electrode 7, a second auxiliary electrode 8 and a final acceleration electrode 9 are sequentially arranged. A face 11 facing the electron gun 10 is provided with a phosphor screen 12 in which red, blue, and green phosphors are separately arranged, and a shadow having a large number of beam apertures near the phosphor screen surface 12. A mask 13 is arranged to face the phosphor screen surface 12.

As shown in FIG. 3, the first auxiliary electrode 7 includes:
Circular electron beam passage holes 7a, 7 are formed in the end surface on the focusing electrode 6 side.
b and 7c are provided with vertically elongated electron beam passage holes 7d, 7e and 7f respectively on the end face on the second auxiliary electrode 8 side. The second auxiliary electrode 8 is provided with horizontally elongated electron beam passage holes 8a, 8b, 8c on the end surface on the first auxiliary electrode 7 side.

A first voltage applying means 14 for applying a constant focusing voltage (Vfoc) to the first auxiliary electrode 7 and the second auxiliary electrode 8 is provided as the first auxiliary electrode 7 and the first voltage applying means 14. Between the second auxiliary electrode 8 and the first voltage applying means 14, a second voltage applying means 15 for applying a dynamic voltage that drops corresponding to an increase in the deflection angle of the electron beam is applied between the second auxiliary electrode 8 and the first voltage applying means 14. Third voltage applying means 16 for applying a dynamic voltage that rises corresponding to an increase in the deflection angle is provided.

The above-mentioned respective voltages are applied to the first auxiliary electrode 7 and the second auxiliary electrode 8 by the first voltage applying means 14, the second voltage applying means 15 and the third voltage applying means 16. Then, a first axially asymmetric lens electric field of horizontal focusing type and vertical diverging type is generated at the end faces of the first auxiliary electrode 7 and the second auxiliary electrode 8 which face each other. The three electron beams passing through the electron beam passage holes 7d, 7e, 7f, 8a, 8b and 8c are focused by the first axial asymmetric lens electric field, and then the second auxiliary electrode 8 and the final accelerating electrode 9 are formed. Since it is focused by the focusing action of the electric field of the main lens formed between them, a beam spot of optimum focus can be obtained over the entire area of the phosphor screen surface 12.

Further, since the second voltage applying means 15 and the third voltage applying means 16 are made to have dynamic voltages of opposite phases, each of the second voltage applying means 15 and the third voltage applying means 16 is provided. Even if the voltage is reduced to about 1/2 of the conventional dynamic voltage, an axial asymmetric lens electric field can be generated between the first auxiliary electrode and the second auxiliary electrode.

Therefore, the voltages of the second voltage applying means 15 and the third voltage applying means 16 are reduced to about 1/2 of the conventional dynamic voltage so that the color of high resolution can be obtained over the entire area of the phosphor screen surface 12. Images can be obtained.

Next, description will be given of an experimental example confirming the effect of the present invention. The color cathode ray tube device of the present invention having the configuration shown in FIGS. 1 to 3 is a 51 cm tube having a 90 degree deflection angle, an electron beam passage hole 7d of the first auxiliary electrode 7,
7e and 7f are vertically long rectangles of 4.5 × 3.6 mm,
The electron beam passage holes 8a, 8b, 8c of the second auxiliary electrode 8 are each a horizontally long rectangle of 3.6 × 4.5 mm, and the gap between the facing surfaces of the first auxiliary electrode 7 and the second auxiliary electrode 8 is 0.7 mm. The voltage of the first voltage applying means 14 was 7600 V, and the voltages of the second voltage applying means 15 and the third voltage applying means 16 were 100 V to 1 KV, which were the same voltage.

To compare with this, the voltage of the second voltage applying means 15 is set to 0V, the voltage of the third voltage applying means 16 is 100V to 1KV, and the conventional color cathode ray tube device of the same specifications is used. Also made.

In the entire area of the phosphor screen surface 12,
When the voltage at which the beam spot with the optimum focus is obtained is examined, the voltage of the second voltage applying means 15 and the voltage of the third voltage applying means 16 are about 350 V in the present invention.
With the conventional product, the third voltage applying means 16 is about 700V.
Then, a stable and optimally focused beam spot was obtained.

Therefore, in the color cathode ray tube device of the present invention, the voltage of the second voltage applying means 15 and the third voltage applying means 16 can be set to about 350 V, so that an inexpensive semiconductor of low voltage can be used and driven. The cost of the circuit can be reduced.

FIGS. 4 and 5 show the second and third aspects of the present invention.
An example of is shown. This embodiment is different from the first embodiment in that the third voltage applying means 16 is a capacitor 16a or a coil 16b, one end of the capacitor 16a or coil 16b is connected to the second auxiliary electrode 8, and the other end is the first Auxiliary electrode 7
And the second voltage applying means 15 are connected.

According to this embodiment, by connecting the capacitor 16a or the coil 16b as described above,
Since the dynamic voltage of the opposite phase similar to that of the first embodiment can be applied between the first auxiliary electrode 7 and the second auxiliary electrode 8, the same effect as that of the first embodiment can be obtained, and further the capacitor 16a or Since the coil 16b is used, the cost of the third voltage applying means 16 can be reduced.

FIGS. 6 and 7 show the fourth and fifth aspects of the present invention.
An example of is shown. In this embodiment, the second voltage applying means 15 is a capacitor 15a or a coil 15b, the one end of the capacitor 15a or the coil 15b is connected to the first auxiliary electrode 7, and the other end is the second Auxiliary electrode 8
And the third voltage applying means 16 are connected.

According to this embodiment, by connecting the capacitor 15a or the coil 15b as described above,
Since the dynamic voltage of the opposite phase similar to that of the first embodiment can be applied between the first auxiliary electrode 7 and the second auxiliary electrode 8, the same effect as that of the first embodiment can be obtained, and the capacitor 15a or Since the coil 15b is used, the second voltage applying means 15 can be inexpensive.

8 and 9 show a sixth embodiment of the present invention. This embodiment is different from the first embodiment in that the focusing electrode 6
A third auxiliary electrode 17 is provided between the second auxiliary electrode 8 and the first auxiliary electrode 7, and the third auxiliary electrode 17 is connected to the second auxiliary electrode 8 to have the same potential,
Further, vertically elongated electron beam passage holes 17a, 17b, 17c are formed in the third auxiliary electrode 17, and a horizontally elongated electron beam passage hole 7a 'is formed in the end face of the first auxiliary electrode 7 on the side of the focusing electrode 6. , 7b ', 7c' are provided respectively.

Then, when a voltage of the same potential is applied to the third auxiliary electrode 17 and the second auxiliary electrode 8, the third auxiliary electrode 17 and the first auxiliary electrode 7 are horizontally divergent to the opposite end faces. A vertically focusing second axially asymmetric lens electric field is generated. Electron beam passage holes 17a, 17b, 17c, 7
The three electron beams passing through a ', 7b', 7c 'are
Since the second axially asymmetric lens electric field causes the focusing action, a beam spot having a small diameter which is further narrowed down into a perfect circle can be obtained over the entire phosphor screen surface 12 as compared with the first embodiment. As a result, a color image having a higher resolution can be obtained over the entire area of the phosphor screen surface 12.

[0024]

As described above, the present invention provides a cathode,
A control grid electrode, an accelerating electrode, a focusing electrode, a first auxiliary electrode, a second auxiliary electrode, and a final accelerating electrode are sequentially arranged, and are horizontally arranged on opposite end faces of the first auxiliary electrode and the second auxiliary electrode. A first axially asymmetric lens electric field generating means of focusing type and vertically diverging type is provided, and first voltage applying means for applying a constant focusing voltage to the first auxiliary electrode and the second auxiliary electrode is provided. Second voltage applying means for applying a dynamic voltage that decreases in response to an increase in the deflection angle of the electron beam is provided between the first auxiliary electrode and the first voltage applying means, and the second auxiliary electrode The third voltage applying means for applying a dynamic voltage that rises in response to an increase in the deflection angle of the electron beam is provided between the first voltage applying means and the first voltage applying means. That of the third voltage applying means Dynamic voltage Les can reduced to about 1/2 of the conventional dynamic voltage, in which inexpensive color cathode-ray tube apparatus is obtained.

[Brief description of drawings]

FIG. 1 is a front view of a color cathode ray tube device according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view of an electron gun of the color cathode ray tube device.

FIG. 3 is an enlarged structural diagram of each electrode of the electron gun.

FIG. 4 is an enlarged front view of the second embodiment of the electron gun.

FIG. 5 is an enlarged front view of the third embodiment of the electron gun.

FIG. 6 is an enlarged front view of the fourth embodiment of the electron gun.

FIG. 7 is an enlarged front view of the fifth embodiment of the electron gun.

FIG. 8 is an enlarged front view of a sixth embodiment of the electron gun.

FIG. 9 is an enlarged structural diagram of each electrode of the electron gun.

[Explanation of symbols]

 3a, 3b, 3c cathode 4 control grid electrode 5 acceleration electrode 6 focusing electrode 7 first auxiliary electrode 8 second auxiliary electrode 9 final acceleration electrode 14 first voltage applying means 15 second voltage applying means 16 third voltage applying means

Claims (4)

[Claims] 1. A cathode, a control grid electrode, an accelerating electrode, a focusing electrode, a first auxiliary electrode, a second auxiliary electrode, and a final accelerating electrode are sequentially arranged, and the first auxiliary electrode and the second auxiliary electrode are connected. A first axially asymmetric lens electric field generating means of horizontally converging type and vertically diverging type is provided on the opposite end faces, and a constant focusing voltage is applied to the first auxiliary electrode and the second auxiliary electrode; A second voltage applying means is provided between the first auxiliary electrode and the first voltage applying means for applying a dynamic voltage that drops in accordance with an increase in the deflection angle of the electron beam. A third voltage applying unit is provided between the second auxiliary electrode and the first voltage applying unit for applying a dynamic voltage that rises corresponding to an increase in the deflection angle of the electron beam. Color cathode ray tube device. 2. A third auxiliary electrode is provided between the focusing electrode and the first auxiliary electrode, and the third auxiliary electrode and the first auxiliary electrode are horizontally divergent and vertically oriented on opposite end faces of the third auxiliary electrode and the first auxiliary electrode. 2. The color cathode ray tube device according to claim 1, further comprising a focusing type second axially asymmetric lens electric field generating means, wherein the third auxiliary electrode has the same potential as that of the second auxiliary electrode. 3. The first axially asymmetric lens electric field generating means comprises:
The long hole is provided in the vertical direction on the end surface of the first auxiliary electrode on the second auxiliary electrode side, and the long hole is provided in the horizontal direction on the end surface of the second auxiliary electrode of the first auxiliary electrode. Color cathode ray tube device. 4. The second axially asymmetric lens electric field generating means comprises:
3. The color cathode ray tube device according to claim 2, wherein a long hole is provided in the horizontal direction of the third auxiliary electrode surface, and a long hole is provided in the vertical direction on the end surface of the first auxiliary electrode on the third auxiliary electrode side.