JP3097344B2 - CRT - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube,
In particular, the present invention relates to a device for deflecting and converging the trajectory of an electron beam.

[0002]

2. Description of the Related Art FIG.
Vol. 86, No. 89, page 19, "CRTs" is a configuration diagram showing a conventional cathode ray tube shown in Eiichi Yamazaki. In the figure, reference numeral 1 denotes an electron gun constituting a cathode ray tube, and 2 denotes a vacuum tube, which constitutes a beam trajectory of an electron beam emitted from the electron gun 1. A deflection yoke 3 is provided around the vacuum tube 2 and generates a magnetic field for deflecting the beam trajectory of the electron beam. Reference numeral 4 denotes a lens independently including a main lens and a quadrupole lens.

Next, the operation of this device will be described. Electron gun 1
The extracted electron beam is converged and accelerated by the lens 4. Thereafter, the electron beam enters the center of the deflection yoke 3. At this time, the deflection yoke 3 generates vertical and horizontal magnetic fields, and guides the electron beam to a predetermined position on the screen of the vacuum tube 2.

In a color cathode ray tube, there are three electron beams extracted from the electron gun 1, each of which hits a fluorescent screen on which a red, green and blue fluorescent paint is applied on a screen. As a result, three colors are generated, and various colors are created by appropriately selecting the intensity of each other.

In the above-described cathode ray tube, it is necessary to collect three electron beams at all points on the screen, and the magnetic field generated by the deflection yoke 3 is not a uniform magnetic field but nonlinear at the entrance and exit sides. It is necessary to generate a strong magnetic field. Further, the intensity of the generated magnetic field affects the deflection sensitivity of the electron beam, and it is desirable that the magnetic field generated by the deflection yoke 3 has a large intensity from the necessity of increasing the deflection angle.

Here, if the inner diameter of the deflection yoke 3 is reduced, it is possible to increase the intensity of the generated magnetic field in a portion where electrons pass. However, when attaching the deflection yoke 3,
Since the insertion is made by sliding from the electron gun 1 side, the inner diameter of the deflection yoke 3 cannot be smaller than the outer diameter of the vacuum tube 2 on the electron gun side, that is, the inner diameter of the deflection yoke 3 depends on the size of the electron gun 1. Was restricted. Particularly, in the case of using the large electron gun 1, the outer diameter of the vacuum tube 2 on the electron gun side is configured to be large, and the inner diameter of the deflection yoke 3 is determined by this outer diameter.

[0007]

As described above, in the conventional cathode ray tube, it is difficult to obtain a high-intensity magnetic field with the deflection yoke 3, and it is relatively difficult to generate a non-linear magnetic field. There was a point.

The present invention has been made in order to solve such a problem, and increases the magnetic field strength by the deflection yoke 3.
The bending angle of the electron beam trajectory can be increased
The purpose is to obtain a cathode ray tube.

[0009]

A cathode ray tube according to the present invention is provided with an electron gun, a vacuum tube constituting a beam trajectory of an electron beam emitted from the electron gun, and an electron beam provided around the vacuum tube. A deflection yoke for generating a magnetic field for deflecting the beam trajectory, wherein the deflection yoke has a plurality of cuts on the electron beam input side.
It is provided with two or more yoke members, each of which has a projection of a magnetic material attached to the cut portion and protrudes to the vacuum tube side and a coil for generating a magnetic field at the projection so as to face the vacuum tube. is there.

[0010]

[0011]

In the cathode ray tube constructed as described above, the beam trajectory is deflected by the deflection yoke and the yoke material.
The yoke material into the notch in the deflection yoke.
The magnetic field strength of the deflection yoke.
Can be Therefore, increase the bending angle of the beam orbit.
it can.

[0012]

【Example】

Embodiment 1 FIG. FIG. 1 is a configuration diagram showing a CRT according to Embodiment 1 of the present invention. In the figure, reference numerals 1 and 2 are the same as those of the conventional device, and the lens 4 is omitted. In the drawing, reference numeral 5 denotes a deflection yoke, and reference numeral 6 denotes a yaw of a magnetic body mounted for the purpose of saving a magnetic path after mounting the deflection yoke.
Reference numeral 7 denotes a multi-pole coil. In the figure, the arrow A indicates the insertion direction when the yoke 6 is inserted. FIG. 2 is a top view of an insertion portion when the yoke 6 is inserted, and FIG. 3 is a perspective view showing the yoke 6. 4 and 5 are explanatory diagrams showing the magnetic pole shape (a) of the magnetic material of the yoke material 6 and the magnetic field distribution (b) generated at that time. The deflection yoke 5 and the yoke material 6 are made of a magnetic material such as a ferrite core.

Next, the operation principle will be described. In this embodiment, the deflection yoke 5 and the yoke material 6 constitute a deflection yoke. The operations are deflection of the electron beam and convergence correction of the three beams. That is, the deflection yoke 5 and the yoke material 6 generate horizontal and vertical magnetic fields to deflect the trajectory of the electron beam. In this embodiment, as shown in FIG. 2, a cut is made at the end of the deflection yoke 5 on the electron beam input side so that the yoke material 6 as a magnetic pole can be inserted from the outside. The yoke member 6 has a magnetic material projection 6a projecting toward the vacuum tube 2 and a coil 6b for generating a magnetic field at the projection 6a. I have one.

By configuring the shape of the projection of the yoke material 6 as shown in the figure, other pole components can be easily generated, and the convergence characteristics are improved. For example, when the yoke member 6 is configured as shown in FIG. 4A, the magnetic field intensity B generated between the opposed yoke members 6 is as shown in FIG. 4B. FIG. 4 (b)
The horizontal axis indicates the distance x from the center P of the yoke material 6, and the vertical axis indicates the magnetic field strength B. In the case of this shape, the magnetic field intensity B generates a distribution that becomes smaller toward the outside.

Further, for example, FIG. 5 Yo as the (a) - click member 6
By configuring the opposing Yo - field strength generated between the click member 6 B is as shown in Figure 5 (b). 5 (b) is Yo horizontal axis - represents a distance x from the center P of the click member 6 shows the magnetic field strength B on the vertical axis. In the case of this shape, a magnetic field distribution is obtained in which the magnetic field strength B increases as going to the outside.

In the cathode ray tube configured as described above,
By adjusting the shape of the magnetic material of the yoke member 6, a desired magnetic field distribution can be obtained, and a magnetic field capable of efficiently collecting three beams can be generated. The deflection yoke 5 and the yoke member 6 are formed in a cylindrical shape. In particular, since the yoke material 6 is configured to be detachable from the deflection yoke 5 , the mounting is simple. Also, a notch is made at the end of the deflection yoke 5, and after the deflection yoke 5 is mounted, a projection 6a is formed at the notch.
, And adjusting the shape thereof, magnetic field distributions of various shapes can be generated, and the convergence of the electron beam can be improved.

The opposed yoke member 6 is arranged so as to surround the periphery of the vacuum tube 2.
In the case of individual pieces, it is desirable that the ends of the protruding portions 6a are separated by about 120 degrees. If there is an interval of about 120 degrees, 3
A magnetic field (a pin magnetic field and a barrel magnetic field) can be easily generated when one electron beam is used.

Embodiment 2 FIG. FIG. 6 is a configuration diagram showing a CRT according to Embodiment 2 of the present invention. In the figure, 1, 2,
Is the same as the conventional device, and the lens 4 is omitted. Reference numeral 5 denotes a deflection yoke disposed at a portion where the cathode ray tube opens in a trumpet shape, and reference numeral 8 denotes a yoke material disposed on the electron gun 1 side. The outer diameter of the vacuum tube 2 in this embodiment is uniform on the electron gun 1 side and the deflection yoke 5 side, as in the first embodiment. FIG. 7 shows V in FIG.
It is sectional drawing in the II-VII line. As shown in the figure, three electron beams (R, G,
B), the yoke member 8 has two or more magnetic material projections 8a protruding toward the vacuum tube 2 so as to face the vacuum tube 2, in this case four. Further, the protrusion 8a
Has a coil 8b for generating a magnetic field.

Next, the operation principle will be described. In this embodiment, as in the first embodiment, the deflection yoke 5 and the yoke member 8 constitute a deflection yoke. The operations are deflection of the electron beam and convergence correction of the three beams. That is, the deflection yoke 5 and the yoke member 8 generate horizontal and vertical magnetic fields to deflect the trajectory of the electron beam. The yoke member 8 on the side of the electron gun 1 generates horizontal and vertical magnetic fields to deflect the trajectory of the electron beam. The yoke member 8 is attached, for example, by attaching the yoke member 8 to the electron gun 1.
Insert from the side. Further, similarly to the first embodiment, a multipolar component can be generated by appropriately processing the end surface of the yoke member 8.

The deflection yoke 5 has a winding distribution that generates a magnetic field component (first-order magnetic field component) for deflecting the beam trajectory. This winding distribution is used for correcting the convergence and distortion of three beams, which are problems in the deflection yoke 5.

In the cathode ray tube configured as described above,
By adjusting the shape of the magnetic material of the yoke member 8, a desired magnetic field distribution can be obtained, and a magnetic field capable of efficiently collecting three beams can be generated. A portion of the function of the deflection yoke that deflects the beam trajectory is provided on the electron gun 1 side as a yoke member 8 cut off from the deflection yoke 5. As a result, deflection of the beam trajectory is achieved by a local magnetic field, and the amount of distortion and convergence on the screen can be reduced. That is, a magnetic field capable of efficiently collecting three beams can be generated.

Further, if the primary magnetic field is constituted by the yoke member 8, only the multipole magnetic field need be constituted by the deflection yoke 5, so that the number of windings can be reduced as compared with the case where a uniform magnetic field is obtained. There is also.

Embodiment 3 FIG. FIG. 8 is a configuration diagram showing a CRT according to Embodiment 3 of the present invention. In the figure, 1,
5 and 8 are the same as those in the second embodiment, and the lens 4 is omitted. As shown in FIG. 8, the outer diameter of the vacuum tube 2 in this embodiment from the portion of the electron gun 1 to the portion where the vacuum tube 2 opens like a trumpet is small.

Next, the operation principle of the third embodiment will be described. In this embodiment, as in the second embodiment, the deflection yoke is constituted by the deflection yoke 5 and the yoke member 8. The operations are deflection of the electron beam and convergence correction of the three beams. That is, the deflection yoke 5 and the yoke member 8 generate horizontal and vertical magnetic fields to deflect the trajectory of the electron beam.

The electron beam emitted from the electron gun 1 is R,
G and B exist, each having an interval of about 5 mm. Therefore, the width of the electron beam is 10 mm. Therefore, it is sufficient that the generated magnetic field region exists in this range. However, the electron gun 1 main body has a diameter of about 20 mm, and when the glass tube is formed to have a uniform thickness from the electron gun 1 to a portion where the tube opens like a conventional case,
The distance between the magnetic poles of the deflection yoke is about 20 mm, and the intensity of the generated magnetic field is reduced. Therefore, in the third embodiment, the electron gun 1
The outer diameter of the vacuum tube 2 from the portion to the portion where the vacuum tube 2 opens in a flared manner is reduced to a value restricted by the beam size.

In such a configuration, when attaching the deflection yoke 5 and the yoke member 8 from outside, the thickness of the vacuum tube 2 at the portion of the electron gun 1 becomes a problem. Therefore, in this embodiment, the yoke member 8 is divided into upper and lower parts. FIG. 9 shows I in FIG.
FIG. 3 is a cross-sectional view taken along the line X-IX, in which a yoke member 8 is constituted by two members as shown in the figure, and is attached so as to sandwich the vacuum tube 2 at the time of attachment; . In this way, when the yoke member 8 is attached to the vacuum tube 2 in a narrow portion between the portion of the electron gun 1 and the portion where the vacuum tube 2 opens in a trumpet shape, two yoke members 8 are attached.
Can be made closer to the electron beam, the magnetic field intensity generated by the deflection yoke can be improved, and the bending angle of the beam trajectory can be increased.

As in the first and second embodiments, by adjusting the shape of the magnetic material of the yoke member 8, a desired magnetic field distribution can be obtained, and a magnetic field capable of efficiently collecting three beams can be generated. it can. Further, of the function of the deflection yoke, a portion for deflecting the beam trajectory is provided as a yoke member 8 and cut off from the deflection yoke 5, so that the deflection of the beam trajectory is achieved by a local magnetic field. Therefore, the amount of distortion and convergence on the screen can be reduced. That is, a magnetic field capable of efficiently collecting three beams can be generated.

Further, if the primary magnetic field is constituted by the yoke member 8, only the multipole magnetic field may be constituted by the deflection yoke 5, and the number of windings can be reduced as compared with the case of obtaining a uniform magnetic field. There is also.

Embodiment 4 FIG. FIG. 10 is a configuration diagram showing a CRT according to Embodiment 4 of the present invention. In the figure, 1,
2, 5, 6, and 7 are the same as those in the first embodiment, and the lens 4 is omitted. Further, in the vacuum tube 2 of this embodiment, as in the third embodiment, the outer diameter of the vacuum tube 2 from the portion of the electron gun 1 to the portion where the vacuum tube 2 opens like a trumpet is reduced.

Next, the operation principle will be described. In this embodiment, the deflection yoke 5 and the yoke material 6 constitute a deflection yoke, as in the first embodiment. The operations are deflection of the electron beam and convergence correction of the three beams. That is, the deflection yoke 5 and the yoke material 6 generate horizontal and vertical magnetic fields to deflect the trajectory of the electron beam.

In the vacuum tube 2 of this embodiment, the outer diameter from the portion of the electron gun 1 to the portion where the vacuum tube 2 opens like the third embodiment is a value restricted by the beam size. To thin. In such a configuration, when attaching the deflection yoke 5 and the yoke material 6 from outside, the thickness of the vacuum tube 2 at the electron gun 1 becomes a problem. Therefore, in this embodiment, for example, two yoke members 6 are provided so as to face the vacuum tube 2, and the deflection yoke 5 is cut into the end. The inner radius of the basic shape of the deflection yoke 5 is larger than the outer radius of the electron gun 1 so that the portion of the electron gun 1 can be passed without difficulty. afterwards,
If the protrusion 6a of the yoke material 6 is slid and inserted,
The tip of the projection 6a can be brought closer to the electron beam, and large intensity deflection becomes possible.

Also in this embodiment, as in the second embodiment, by adjusting the shape of the magnetic material of the yoke member 8, a desired magnetic field distribution can be obtained, and a magnetic field capable of efficiently collecting three beams. Can be generated. Further, of the function of the deflection yoke, a portion for deflecting the beam trajectory is provided as a yoke material 6 cut off from the deflection yoke 5. As a result,
The deflection of the beam trajectory is achieved by a local magnetic field, and the amount of distortion and convergence on the screen can be reduced. That is, a magnetic field capable of efficiently collecting three beams can be generated.

When the primary magnetic field is constituted by the yoke member 8, only the multipole magnetic field need be constituted by the deflection yoke 5, and the number of windings can be reduced as compared with the case of obtaining a uniform magnetic field. There is also. In addition, by making a cut in the end of the deflection yoke and inserting the projection 6a into the cut after the deflection yoke is mounted and adjusting the shape, magnetic field distributions of various shapes can be generated, thereby converging the electron beam. Can be improved.

[0034]

As described above, according to the first aspect of the present invention,
A cathode ray tube comprising: an electron gun; a vacuum tube forming a beam trajectory of an electron beam emitted from the electron gun; and a deflection yoke provided around the vacuum tube and generating a magnetic field for deflecting the beam trajectory of the electron beam. Has a plurality of cutouts on the electron beam input side, and a yoke material attached to the cutouts and having a projection of a magnetic material protruding toward the vacuum tube side and a coil generating a magnetic field at this projection is attached to the vacuum tube. The strength of the magnetic field is increased by providing two or more
A CRT that can increase the bending angle of the beam orbit
There is an effect that can be.

[0035]

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a top view showing the relationship between the deflection yoke and the yoke material according to the first embodiment.

FIG. 3 is a perspective view illustrating a yoke material according to the first embodiment.

FIG. 4 is an explanatory diagram illustrating a shape and a magnetic field distribution of a yoke material according to the first embodiment.

FIG. 5 is an explanatory diagram showing a shape and a magnetic field distribution of the yoke material according to the first embodiment.

FIG. 6 is a configuration diagram showing a cathode ray tube according to a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII in FIG. 6;

FIG. 8 is a configuration diagram showing a CRT according to Embodiment 3 of the present invention.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a configuration diagram showing a cathode ray tube according to Embodiment 4 of the present invention.

FIG. 11 is a configuration diagram showing a conventional cathode ray tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electron gun 2 Vacuum tube 5 Deflection yoke 6 Yoke material 8 Yoke material

Claims (1)

(57) [Claims] 1. An electron gun, a vacuum tube forming a beam trajectory of an electron beam emitted from the electron gun, and a deflecting device provided around the vacuum tube for generating a magnetic field for deflecting the beam trajectory of the electron beam. In a cathode ray tube having a yoke, the deflection yoke has a plurality of cut portions on the electron beam input side , and
And two or more yoke members having a projection of a magnetic material protruding toward the vacuum tube and a coil generating a magnetic field at the projection are provided so as to face the vacuum tube. CRT .