JPH0935665A - Cathode ray tube display - Google Patents

Abstract

(57) [Abstract] [Purpose] A convergence device is added without affecting the magnetic field of the deflection yoke to improve the performance of the standard cathode ray tube display device. [Structure] The electromagnetic coils of the convergence device 5 are air-core electromagnetic coils 22 to 26 without a ferromagnetic core, which are laminated on the inner peripheral surface of a cylindrical holder 10 made of a non-magnetic material and attached to the neck portion of a cathode ray tube. And a plurality of ring-shaped magnets 14 to 17 are arranged on the outer peripheral surface of the cylindrical holder. The magnetic field generated by the air-core electromagnetic coil is applied to the red, green, and blue electron beams to perform convergence adjustment and purity adjustment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device using a cathode ray tube, and more particularly to a cathode ray tube display device having a convergence device having an electromagnetic coil at a neck portion of the cathode ray tube.

[0002]

2. Description of the Related Art In a conventional cathode ray tube display device using an in-line array electron gun, a horizontal magnetic field of a deflection yoke is a pinion type, and a vertical magnetic field is a barrel type. It is possible to achieve convergence over a wide range, and it is used in many color image display tubes. Furthermore, in order to meet the specifications of high convergence performance, a correction magnetic field is generated by a plurality of electromagnetic coils provided at the neck end of the deflection yoke, and red, green, and
A convergence device that focuses the three blue electron beams is used.

[0003]

However, in order to obtain a high-performance cathode ray tube display device by designing and manufacturing the cathode ray tube display device having a configuration without a convergence device as standard specifications, the above-mentioned convergence is required. If an economical production system in which the basic configuration is shared by adding a device is adopted, a high-performance cathode ray tube display device has a problem that the performance of the deflection yoke is changed. That is, the magnetic field generated by the deflection yoke is distorted by the convergence device, and the performance of the deflection yoke changes. In particular, when the distance between the convergence device and the electron beam becomes long, the magnetic field generated by the electromagnetic coil must be strengthened, so that the influence on the magnetic field generated by the deflection yoke also becomes large, and the drive current must be further increased. There is a problem that the scale becomes large.

An object of the present invention is to provide a high-performance cathode ray tube display device economically without affecting the performance of the deflection yoke depending on the presence or absence of a convergence device.

[0005]

In order to achieve the above-mentioned object, the present invention provides an electromagnetic coil in a convergence device which is formed by laminating a non-magnetic insulator with a spiral coil conductor to form a cylindrical stack. A core electromagnetic coil is mounted on the outer periphery of the neck portion of the cathode ray tube separately from the deflection yoke, and the 4-pole magnetic field, 6-pole magnetic field and 2-pole magnetic field generated by the air-core electromagnetic coil are converted into red, green and blue electron beams. It was made to act and convergence adjustment and purity adjustment were made. Since the air-core electromagnetic coil provided on the outer periphery of the neck portion can approach the electron beam, the electron beam can be controlled by a weak magnetic field, and the influence on the magnetic field generated by the deflection yoke is small, so no convergence device is used. By using a standard configuration of a cathode ray tube display device as a basic structure and adding a convergence device thereto, a high performance cathode ray tube display device can be economically realized.

[0006]

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

FIG. 1 is a side view of a cathode ray tube display device showing a first embodiment of the present invention, FIG. 2 is an exploded perspective view of a convergence device which is the main part of this embodiment, and FIG. 3 is A in FIG. -A sectional view, Drawing 4 (a)-(e) is a top view which expanded and showed each air core electromagnetic coil side by side, Drawing 5 (a)-
(F) is a characteristic diagram showing the relationship between the magnetic field generated by the air-core electromagnetic coil and the force acting on the electron beam.

As shown in FIG. 1, a cathode ray tube glass container in a cathode ray tube display device is roughly divided into three parts, a panel portion 1 for displaying an image, a funnel-shaped funnel portion 2 and an electron gun (not shown). No.) is built in the neck portion 3. The panel unit 1 has a fluorescent surface (not shown) in which a red, green, and blue three-primary-color phosphor is applied to the inner surface of a transparent glass container, and three primary colors are emitted by irradiation of three electron beams emitted from an electron gun. The phosphor emits light. A deflection yoke 4 having a vertical coil and a horizontal coil is mounted between the neck portion 3 and the funnel portion 2 and deflects an electron beam (not shown) emitted from an electron gun vertically and horizontally. Further, a convergence device 5 is attached to the neck portion 3 separately from the deflection yoke 4.

As shown in FIGS. 2 and 3, the convergence device 5 is an air-core electromagnetic coil 22 that is attached in a laminated state to the inner peripheral surface of a non-magnetic cylindrical holder 10 made of resin to generate a quadrupole magnetic field. , 23 and an air-core electromagnetic coil 24, 25 for generating a 6-pole magnetic field, and two pairs of air-core electromagnetic coils 26 for generating a 2-pole magnetic field, and the innermost coil is substantially adhered to the outer periphery of the neck portion 3 or is made of resin. Is mounted so as to approach the electron beam via a support (not shown). Each of the air core electromagnetic coils has a plurality of coil conductors formed by shaping a magnet wire (wire material) into a spiral shape and arranged on a support member of a resin film.

Further, on the outer peripheral surface of the cylindrical holder 10, a two-pole magnet 14, a spacer 15, a four-pole magnet 16,
The spacer 15 and the 6-pole magnet 17 are arranged and fixed by the fixing plates 11 and 18 at both ends thereof. The 4-pole magnet 16 and the 6-pole magnet 17 are two magnet rings 16a, 16b and 17a, 1 installed side by side.
7b, the strength of the generated magnetic field is set by the respective relative opening angles, and the magnet rings 16a to 17b.
It is used for so-called static convergence (focusing of three electron beams) by setting the direction of each generated magnetic field by adjusting the absolute rotation angle of. The two-pole magnet 14 includes two magnet rings 17a and 1a.
The intensity of the generated magnetic field is set by the relative opening angle of 7b, and the direction of each generated magnetic field is set by the absolute rotation angle adjustment, which is used for the purity (color purity) adjustment. The arc piece 12 formed integrally with the end of the holder 10 is fastened to the outer peripheral surface of the neck portion 3 by a tightening band 19 and attached to the neck portion 3.

FIG. 4 shows each of the air core electromagnetic coils 22, 2 described above.
It is the top view which expanded and showed 3,24,25,26 side by side.

(A) and (b) show air-core electromagnetic coils 22 and 23 for a quadrupole magnetic field. Air core electromagnetic coil 22
Is a spiral coil of each rectangular shape such that the center thereof is located at the positions of θ = 0, 90, 180, and 270 degrees, which are obtained by dividing the outer circumference of the neck portion 3 into four equal parts with reference to θ = 0 degree (y-axis). Conductor 2
2a to 22d are arranged on a non-magnetic support film 22e made of resin, and further connection terminals 22f and 22g are led out. In the air-core electromagnetic coil 22, the coil conductors 22a and 22c generate magnetic fields having the same sign, and the coil conductors 22b and 22d generate magnetic fields having the same sign, which is shown in FIG. Such a quadrupole magnetic field is generated.

Similarly, the air-core electromagnetic coil 23 has a θ = 4
The rectangular spiral coil conductors 34, 35, 36, so that their centers are located at 5,135, 225,315 degrees.
37 is placed on the non-magnetic support film 23e made of resin,
Furthermore, the connection terminals 23f and 23g are led out. The air-core electromagnetic coil 23 has the coil conductor 2
3a and 23c generate magnetic fields having the same sign, and the coil conductor 23
b and 23d generate another magnetic field of the same sign,
A quadrupole magnetic field as shown in FIG. 5B is generated.

The white arrows in FIGS. 5A and 5B represent red (R), green (G), and blue (B) electron beams arranged in a line in the horizontal direction about the tube axis z. Indicates the force received from the quadrupole magnetic field. The quadrupole magnetic field generated by the air-core electromagnetic coil 22 moves the electron beams R and B on both sides in the vertical (y-axis) direction, and the quadrupole magnetic field generated by the air-core electromagnetic coil 23 changes the electron beams R and B on both sides. B is horizontal (x
The electron beams R and B are moved in the opposite directions.

FIGS. 4 (c) and 4 (d) show air-core electromagnetic coils 24 and 25 for a hexapole magnetic field. Air core electromagnetic coil 2
4 divides the outer circumference of the neck portion 3 into six equal parts, and θ = 0, 60, 1
Each of the spiral coil conductors 24a, 24 having a rectangular shape so that its center is located at 20, 180, 240, 300 degrees.
b, 24c, 24d, 24e, and 24f are arranged on a nonmagnetic support film 24g made of resin, and further, a connection terminal 24
It is constructed by deriving h and 24i. The air-core electromagnetic coil 24 includes coil conductors 24a, 24c, 24.
e generates a magnetic field having the same sign, and the coil conductors 24b, 24
Since d and 24f generate magnetic fields of the same sign,
A sextupole magnetic field as shown in FIG. 5C is generated.

Similarly, the air-core electromagnetic coil 25 has a θ = 3
Square spiral coil conductor 25 with its center located at 0, 90, 150, 210, 270, 330 degrees
a, 25b, 25c, 25d, 25e and 25f are arranged on a non-magnetic support film 25g made of resin, and further connection terminals 25h and 25i are led out. The air-core electromagnetic coil 25 includes coil conductors 25a, 2
5c and 25d generate magnetic fields having the same sign, and the coil conductor 25
b, 25d, and 25g generate magnetic fields having the same signs, thereby generating the sextupole magnetic field shown in FIG.

The white arrows in FIGS. 5 (c) and 5 (d) indicate the forces that the three electron beams receive from the sextupole magnetic field. The sextupole magnetic field generated by the air-core electromagnetic coil 24 moves the electron beams R and B on both sides in the horizontal (x-axis) direction, and the sextupole magnetic field generated by the air-core electromagnetic coil 25 causes the electron beams R and B on both sides. B is moved in the vertical (y-axis) direction, and the electron beams R and B are moved in the same direction.

These quadrupole magnetic field air core electromagnetic coils 22,
23 and the air-core electromagnetic coils 24 and 25 for the six-pole magnetic field, the correction current modulated in synchronization with the horizontal deflection or vertical deflection of the electron beam is applied to the connection terminals 22f, 22g, 23f and 23.
g, 24h, 24i, 25h, 25i to generate the magnetic fields of 4 poles and 6 poles as described above, and move the electron beams R and B on both sides to converge over the entire phosphor screen. It is possible to correct the deviation and reproduce a high-quality image.

FIG. 4 (e) shows an air-core electromagnetic coil 26 for a two-pole magnetic field. The air-core electromagnetic coil 26 divides the outer periphery of the neck portion 3 into two equal parts, and has a rectangular spiral coil conductor 26a, 2 such that its center is located at a position of θ = 0, 180 degrees.
6c is placed on the non-magnetic support film 26e made of resin,
A bipolar magnetic field as shown in FIG. 5 (e) is generated. Furthermore, θ
= 90,270 degrees coil conductor 26b,
26d generates a bipolar magnetic field as shown in FIG. 5 (f). The coil conductor 26a of the air-core electromagnetic coil 26,
The dipole magnetic field generated by 26c is generated by the three electron beams R,
All G and B are moved in the horizontal direction, and the coil conductors 26b, 2
The bipolar magnetic field generated by 6d has three electron beams R, G, B
Move all vertically. The air-core electromagnetic coil 26 for the two-pole magnetic field is supplied with a correction current via two sets of connection terminals 26f to 26i to generate a magnetic field. Move the three electron beams R, G, B by a predetermined amount by the bipolar magnetic field,
Purity over the entire phosphor screen is corrected and a high-quality reproduced image can be obtained. Further, the correction current of the air-core electromagnetic coil 26 can be adjusted from the outside, and when the force received from the geomagnetism of the electron beam is changed by moving the installation location of the image display apparatus, the air-core electromagnetic coil 26 is deteriorated. The correction current of the electromagnetic coil 26 is readjusted.

The convergence device 5 includes an air-core electromagnetic coil 2 for a quadrupole magnetic field for adjusting the x-direction and the y-direction.
Air core electromagnetic coils 24, 25, 2 for 2, 23 and 6 pole magnetic field
It is not necessary to mount all of the air-core electromagnetic coil 26 for the polar magnetic field, and a necessary correction coil may be provided according to the specifications.

FIG. 6 shows a second embodiment of the present invention. (A) is a plan view showing an expanded air-core electromagnetic coil for a quadrupole magnetic field, and (b) is this air-core. FIG. 6 is a perspective view of a holder on which an electromagnetic coil is mounted, and FIG. The same components as those in the first embodiment described above are designated by the same reference numerals, and duplicate description will be omitted.

The upper edge of the non-magnetic support film 22e of the air-core electromagnetic coil 22 for the quadrupole magnetic field (the edge on the side of the deflection yoke 4).
As shown in (a), θ = 60, 180, 300
Positioning notches 22h, 22i, 22j at angular degrees
Are formed. Then, on the inner peripheral surface of the holder 10,
Positioning pins 10a with which the positioning notches 22h to 22j engage at angular positions of θ = 60, 180, and 300 degrees,
10b and 10c are provided so as to extend in the axial direction. The positioning pins 10a to 10c are inserted at the angular positions of θ = 60, 180, and 300 degrees of the separator 4a of the deflection yoke 4 into which the positioning pins 10a to 10c of the holder 10 are inserted, as shown in (c). Insertion holes 4b, 4c, 4 for regulating the relative angle of the holder 10 with respect to the deflection yoke 4.
d is provided.

The convergence device 5 includes a holder 10
The positioning pin 10a when mounting the
Positioning is performed by pushing -10c into the insertion holes 4b-4d of the separator 4a. The non-magnetic support film 22e to which the coil conductors 22a to 22d of the air-core electromagnetic coil 22 for the quadrupole magnetic field are attached has positioning notches 22h, 22i and 22j formed on the upper edge of the non-magnetic support film 22e. The coil conductors 22a to 22d are arranged on the non-magnetic support film 22e in consideration of the relative angle because the coil conductors 22a to 22d are attached to the holder 10 so as to be engaged with the pins 10a to 10c and form a predetermined relative angle with the holder 10. By doing so, it becomes possible to perform accurate convergence adjustment. The same applies to the other air-core electromagnetic coils 23, 24, 25, 26.

The air-core electromagnetic coil 22 used in the present invention
No. 26 to No. 26 are not limited to the coil conductor formed by shaping the wire material, and for example, a print coil (conductor foil pattern) produced by a printing photographic technique or the like may be used.
Further, each of the electromagnetic coils can be efficiently configured by forming a coil conductor on a continuous film and winding the film into a plurality of layers.

[0025]

The cathode ray tube display device of the present invention is a cathode ray tube display device as an air-core electromagnetic coil formed by stacking the electromagnetic coils of the convergence device in a tubular shape by supporting a spiral coil conductor on a non-magnetic insulator. By attaching to the neck,
The distance from the electron beam is shortened, control is possible with a weak magnetic field, the influence on the magnetic field generated by the deflection yoke is small, and the scale of the drive circuit can be reduced. Therefore, by adding a convergence device by commonly using the standard specification cathode ray tube display device which is capable of performing the predetermined convergence adjustment and the purity adjustment by the deflection yoke without equipping the convergence device, a high performance can be obtained. A cathode ray tube display device can be economically obtained.

[Brief description of drawings]

FIG. 1 is a side view of a cathode ray tube display device showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the convergence device according to the first embodiment shown in FIG.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a plan view in which air-core electromagnetic coils for a quadrupole magnetic field, a sextupole magnetic field, and a dipole magnetic field in the first embodiment are developed and arranged side by side.

FIG. 5 is a characteristic diagram showing forces acting on a quadrupole magnetic field, a sextupole magnetic field, a dipole magnetic field, and an electron beam in the first embodiment.

FIG. 6 shows a convergence device according to a second embodiment of the present invention, a plan view (a) showing an expanded air-core electromagnetic coil for a quadrupole magnetic field, and a holder on which the air-core electromagnetic coil is mounted. (B), rear view of the deflection yoke (c)
It is.

[Explanation of symbols]

1 ... Panel part, 2 ... Funnel part, 3 ... Neck part, 4 ...
Deflection yoke, 4b to 4d ... Insertion hole, 5 ... Convergence device, 10 ... Cylindrical holder, 10a to 10c ... Positioning pin, 14 ... 2-pole magnet, 14a, 14b ... 2-pole magnet ring, 16 ... 4-pole magnet, 16a , 16
b ... 4-pole magnet ring, 17 ... 6-pole magnet, 1
7a, 17b ... 6-pole magnet ring, 22, 23 ... 4
Air-core electromagnetic coil for polar magnetic field, 22a to 22d, 23a to 2
3d ... Coil conductor, 22e, 23e ... Nonmagnetic support film, 22h-22j ... Positioning notch, 24, 25 ... 6
Air-core electromagnetic coil for polar magnetic field, 24a to 24f, 25a to 2
5f ... Coil conductor, 24g, 25g ... Non-magnetic support film, 26 ... Air core electromagnetic coil for 2 pole magnetic field, 26a-26d
... Coil conductor, 26e ... Non-magnetic support film,

Front Page Continuation (72) Inventor Hiroshi Yoshioka 3300, Hayano, Mobara, Chiba, Hitachi, Ltd., Electronic Devices Division (72) Inventor Yoshio Sato, 3300, Hayano, Mobara, Chiba, Hitachi, Ltd., Electronic Devices Division (72) ) Inventor Hiroshi Sasaki 3300 Hayano, Mobara-shi, Chiba Hitachi, Ltd. Electronic Device Division

Claims (13)

[Claims] 1. A convergence device having an air-core electromagnetic coil for generating one or more sets of 2n-pole magnetic fields (n is an integer of 1 or more), and being attached to a neck portion of a cathode ray tube separately from a deflection yoke. In the cathode ray tube display device, the air-core electromagnetic coil is mounted on the outer circumference of the neck portion by being formed by stacking a spiral coil conductor on a non-magnetic insulator to form a cylindrical stack. Cathode ray tube display device. 2. A cathode ray tube having an air-core electromagnetic coil for generating one or more sets of 2n-pole magnetic fields (n is an integer of 1 or more) and a plurality of ring-shaped magnets cooperating with the air-core electromagnetic coil. In a cathode ray tube display device having a convergence device mounted separately from the deflection yoke at the neck portion of the air-core electromagnetic coil, the air-core electromagnetic coil is fixed in a laminated state on the inner peripheral surface of a cylindrical holder of a non-magnetic material, and the ring A cathode ray tube display device, wherein the magnets are installed on the outer circumference of the cylindrical holder. 3. The cathode ray tube display device according to claim 1, wherein the convergence device includes an air-core electromagnetic coil that generates a 2-pole magnetic field, a 4-pole magnetic field and a 6-pole magnetic field. 4. The cathode ray tube display device according to claim 1, wherein the convergence device includes an air-core electromagnetic coil that generates a 4-pole magnetic field and a 6-pole magnetic field. 5. The cathode ray tube display device according to claim 1, wherein the convergence device includes an air-core electromagnetic coil that generates a two-pole magnetic field and a four-pole magnetic field. 6. The cathode ray tube display device according to claim 1, wherein the convergence device includes an air-core electromagnetic coil that generates a two-pole magnetic field and a six-pole magnetic field. 7. The cathode ray tube display device according to claim 1, wherein the convergence device includes an air-core electromagnetic coil that generates at least a bipolar magnetic field. 8. The cathode ray tube display device according to claim 1, wherein the convergence device includes an air-core electromagnetic coil that generates at least a quadrupole magnetic field. 9. The cathode ray tube display device according to claim 1, wherein the convergence device includes an air-core electromagnetic coil that generates at least a six-pole magnetic field. 10. The cathode ray tube display device according to claim 1, wherein the air-core electromagnetic coil is formed by shaping a magnet wire into a substantially spiral shape. 11. The cathode wire according to claim 1, wherein the air-core electromagnetic coil is formed by forming a spiral conductor foil pattern on a non-magnetic film made of an insulating resin. Tube display device. 12. The cathode ray tube display device according to claim 11, wherein the air-core electromagnetic coil is formed by winding a film in which a plurality of spiral conductor foil patterns are formed into a plurality of layers. 13. A cathode ray tube having an air-core electromagnetic coil for generating a magnetic field of 2n poles (n is an integer of 1 or more), and a convergence device mounted separately from the deflection yoke at the neck portion of the cathode ray tube. In the display device, the air-core electromagnetic coil is fixed to an inner peripheral surface of a cylindrical holder made of a non-magnetic material and provided on an outer peripheral surface of the neck portion, and the cylindrical holder has a relative positional relationship with the deflection yoke. A cathode ray tube display device comprising a positioning means for specifying the.