JPS5840754A - Magnetic-focusing-type cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain an excellent magnetic-focusing-type cathode-ray tube, which has a high reliability and in which concentration of three beams is performed with the magnetic-focusing device itself, by providing each of opposed magnetic yorks with at least independent three cylindrical parts, and making cylindrical parts to have openings which slope up to the side cylinders. CONSTITUTION:Central cylinders 53 and 53' have a simple cylindrical shape with a given height, while side cylinders 54 and 54' have slant openings. The side cylinders 54 of a magnetic york 52 on the negative electrode side have openings sloping up to the center of the york 52, while the side cylinders 54' of a magnetic york 52' on the screen side have openings sloping down to the center of the york 52'. Since the line of magnetic force travels so that magnetic resistance becomes the minimum, a magnetic field formed with the magnetic yorks 52 and 52' with such shapes turns its direction toward the minimum gap between the yorks 52 and 52'. As a result, a magnetic field formed between the yorks 52 and 52' has outward components on the axes of the side cylinders 54 and 54'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetically focused cathode ray tube device having a plurality of electron beams.

As electron beam focusing means, there are both an electrostatic focusing method and a magnetic focusing method, but the magnetic focusing method can obtain a higher solution of 11 degrees. In addition, the magnetic focusing method does not require the supply of a focusing voltage, and concomitant methods also do not require focusing power. This is an example. (1) is a glass envelope that keeps the inside odor-free, (2) is the envelope neck (3R), (3G)
), (3B) are the heater, Yintoku, and 1st . Electron gun structure consisting of a second electrode, (4) a fluorescent screen, (5)
(6), (6y are two opposing soft ferromagnetic magnetic yokes, (7R), (7G), (7B)
are electron gun structures (3R), (3G), and (3B), respectively.
(8) is the deflection yoke, (
9) is a three-electron beam concentrator. A permanent magnet (not shown) for generating a magnetic field is arranged inside the pipe a.

The electron beams (7R), (7G), (7B) emitted from the electron guns (3R), (3G), (31) are the tube axes formed between the opposing magnetic yokes (6), (6)1. The directional magnetic field (: receiving a focusing effect connects the smallest beam spot on the screen (4), making the beam (7) 1) more concentrated using a concentrator (9) to concentrate the electron beam.
, (71) in the direction of the center beam (7G) to perform three beam concentration. However, in such an electron beam concentration method, the electron beam spot on the screen (4) becomes vertically elongated, which is not preferable.

The present invention provides magnetic focusing 11 that performs self-focusing using a concentrated magnetic field.
4*Providing an @ line device 1. To facilitate the explanation of the present invention <Conventional Example 1> Two explanations will be given below. Figure 2 shows the arrangement of permanent magnets above and below the center beam. Figure 2 (al is the cross-sectional shape of the neck, (21!l), (21G), (21B) are 3 electron pins, 1gJ is a permanent magnet with two longitudinal directions, and the center beam The passage hole (21G) is placed at a predetermined position above and below [L-Fig. 2 (bl, lcl is $ 2
15! ! ! (This shows the Y-Y' and
Explain that there is a directional sea screen. Permanent magnet■
The end face in the 2+ direction is magnetized to the N pole and the end face in the 2+ direction is magnetized to the 8 pole value. lI cross section 2nd Z Tol +=N
l[i4: The emitted magnetic lines of force pass through the inside of the magnetic yoke and leak at the gap between the opposing magnetic yoke beams, form a 2+ direction focused magnetic field, are absorbed by the magnetic yoke W2, and return to the S pole. However, it is difficult to completely shape the magnetic field, and in reality there is a magnetic field that originates from the summer pole and goes in one direction to infinity, and a magnetic field that enters the south pole (: from 2 + infinity. li@
A similar situation also occurs for horizontal sections. That is, Fig. 2 (c
The main magnetic field focused at lc is a magnetic field (2), and a 2+ direction field is formed at the end of the magnetic yoke. exist. The tortoise button in Figure 2 shows the outline of the magnetic field distribution on the axis of the nid bee hole (21)I), and 14x is the component that provides the bee A4: deflection effect. ! J3 figure) has a permanent magnet CI of 4
11, and the night beam passing hole (32B), (321
1) Placed above and below the vicinity. This configuration is the second
The x component (described above), that is, the deflection magnetic field component is reduced compared to FIG. 1ml. Furthermore, as shown in Figure 3 (bl, (el), the common layer Wt surrounding the 1; 3 beams before and after the permanent magnet
- Predetermined length C: By setting the above-mentioned deflection component, the above-mentioned deflection component can be reduced to 0 or more, such as the shape of the magnetic yoke, the arrangement of the permanent magnet, etc. It is possible to create a magnetic field that does not exist.

The present invention further focuses the W3 beam in the magnetic focusing device C having almost no deflection magnetic field component as described above.

Hereinafter, the present invention will be explained in detail.

Figure 184 is the original luck diagram of the present invention. Electron tom (41R
), (41G), and (4111) pass through the insides of the magnetic yokes (42) and (43), which have almost no deflection components, and enter the magnetic uniformity gap (44). The main magnetic field in the magnetic yoke gap #(44)C is oriented in the Z+ (th/lean) direction as shown in the figure.
11) At the top, the external magnetic field component lx is made to meet at a predetermined angle θ with respect to the direction of travel. Although it is shocking, there is only a 2+ direction magnetic field on the electron beam (41G).

The force that the beam receives at this time is shown in Figure 4.
From the second (41M)! -To the same person (= (4To)!
+Receive a feeling of mountain orientation. Therefore, after passing through the magnetic yoke gap (44), the electron beam (41B) is in the Y-m direction, and the electron beam (41m) has a velocity component in the I-Yoyama direction. (Z-) and screen side (c+) 4alt = Place! −/ (42χ(
42) 'C' two have an asymmetrical shape, i.e. a pole II
! 1Ii-ri (42)! The screen has sufficient length in two directions to obtain a sufficiently uniform magnetic field, and the screen (42) has a predetermined length.
1 plane 6: The magnetic field is cooled, shaped and weak (the Nx component is even. Fig. 4(e) is an explanatory diagram of the force applied to the beam at the 1-B' cross section 1; as described above. The electron beam at this cross section (41 illusion is garlic and -4. On the other hand, the magnetic field has -By and -]Bx, so the force exerted on the beam is yX - ax (-1x), νy" ( -6)X(-1
x) and! One direction and! Receives force in the + direction. Therefore, the electron beam (411) is! Moderate in one direction! + Obtain direction velocity. ! The ten-directional velocity was received by the Mumu′ cross section! As a whole, it cancels out the unidirectional velocity component! The directional velocity component is zero, and the X unidirectional velocity component remains. Reverse position C: Same as -2 in a certain beam (411)! Both like 0 or more to get the + direction velocity component! The id beam will receive a concentration effect in the center beam direction g. FIG. 5 is a horizontal cross-sectional view of a magnetic sound reel according to an embodiment of the present invention. (
(52
), (52)' are opposed magnetic yokes according to the present invention, and (51) K square y side magnetic yoke is the present invention C.
The opposing magnetic actuators (52) and (52)' have two cylindrical parts (53λ(
54) and (53)-(54)'. This cylindrical part has a center cylinder (53λ), which is a simple cylinder with a predetermined height, but both side cylinders have an inclined opening. Sound-
It has an opening that is inclined so that the height increases as the center goes away, and the screen side magnetic opening (52)' (conversely, the magnetic sound opening goes towards the center; therefore, the height decreases). This is because the magnetic field shaped by the magnetic yoke (521 (52)') having such a shape, which has an inclined aperture, has 6 two lines of magnetic force so that the magnetic resistance is minimized.

Adjust the direction to the minimum direction of the gap between both magnetic 1-ri (52χ (52) 7. As a result, the magnetic sound-ri (52), (5
2) The magnetic field formed between the nide and cylinder (5G (5
4) ' has an outward component. As shocking as it sounds, if the polarity of a permanent magnet is reversed, the opposite will occur. Cathode side magnetic sound (
51) may be used as long as the internal magnetic field is sufficiently uniform and the beam is practically not deflected. (51) Any device may be used as long as it can control the deflection component of the rescreen side leakage magnetic field to a predetermined value depending on the height and shape of the hole.

As described above, C: Three beams of the magnetic yoke to which the present invention is applied C: The effect provided is as explained using FIG. 184, and detailed explanation will be omitted. C: The present invention can change the angle of the inclined aperture of both toids. Since the magnetic field inclination angle can be changed as appropriate, the 3-beam focusing effect can also be set appropriately, and its versatility is wide. It is also easy to manufacture.

Needless to say, the same effect can be obtained even if the cylindrical portion is formed inside the opposing magnetic yoke.

As described above 1: According to the present invention, the magnetic focusing device itself
Beam concentration is performed, the advantages of the magnetic focusing method are fully utilized, and a good and reliable magnetic focusing cathode ray device can be provided.

[Brief explanation of the drawing]

The first factor is a schematic configuration diagram showing an example of a magnetically focused cathode ray tube device, FIG. 2 (al) and FIG. Hen 1 (1
1 and IJ3 Figures 1'bs to (e) are also neck side m
4-1 to 4-1 (aS is a side view and cross-sectional view for explaining the present invention in detail, and FIG. 5 is a magnetic yoke according to an embodiment of the present invention. 1 is a schematic horizontal cross-sectional view showing parts (411), (41G), (41B)...electron beam (42χ(42)', (43χ(-)'...magnetic yoke (44)...・Magnetic yoke gap (51χ(51)'...common magnetic sound gap (52χ(5)
2)'... Opposite magnetic yoke (53χ(53)',
(541 (54)'... Cylindrical part (7317) agent
Patent Attorney Noriyuki Chika (and 1 other person) Figure 2 - Z
, 5°C
(d) Figure 4 (lL)

Claims (1)

[Claims] l) Glass outer H-ware and this outside 12! ! An electron gun is sealed in the neck portion of the device and emits three electron beams in an in-line arrangement, and is equipped with a control means, a fluorescent surface formed on the inner surface of the envelope panel, and a vicinity of the fluorescent surface. A cathode ray tube composed of a Nyadou mask as the main element,
In the magnetically focused cathode ray tube device, which is equipped with a permanent magnet for generating a magnetic field in the tube axis direction and a magnetic sounder for shaping the magnetic field as a focusing means for the electron beam, the magnetic yokes facing each other have at least three cylindrical shapes. The shape of the cylinders on both sides of the cylindrical part is such that the height of the cylinder side is higher than the height of the other side. 1. It has two inclined openings, and in the other magnetic sound hole, the height on the center cylinder side is lower than the height of the other one. 6. It has an inclined opening. Magnetic focusing m cathode ray tube device. 2) Region C where the pair of opposing magnetic sound links from the cathode that emits the electron beam: The radial magnetic field component on the Nydby five-axis is as small as possible, and the pair of opposing magnetic sound links are as small as possible. The magnetic focusing type according to claim 1, characterized in that the magnetic sound is made asymmetrical between the screens 6; so that a predetermined radial magnetic field component is formed on the axis of the ray beam. Cathode ray tube device.