JPS6023939A - meshless cathode ray tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a cathode ray tube (CRT) for use in oscilloscopes, storage oscilloscopes, etc., and more particularly to a meshless cathode ray tube having a structure in which mesh electrodes are removed.

Prior art In a conventional post-acceleration cathode ray tube, the electron beam emitted from an electron gun is deflected vertically or horizontally, and then accelerated by a post-acceleration electric field formed by a flat or curved mesh and a post-acceleration electrode on the inner wall of the bulb. By doing so, a spot of increased brightness is obtained on the fluorescent screen. However, this type of cathode ray tube has the disadvantage that the mesh deteriorates the spot resolution and electron gun efficiency, and that secondary electrons hitting the mesh cause halation on the screen surface.

To solve this kind of drawback, a box-shaped scanning magnifying lens disclosed in Japanese Patent Publication No. 57-25942 is known as a cathode ray tube that does not use a mesh. However, in this type of cathode ray tube, the lens has a total length of 10.6 ty.
n, width 6.3 c7'n, height 2.5 cm It is much thicker than the dome mesh type, so it has the disadvantage that conventional glass bulbs cannot be used, and when used in post-acceleration cathode ray tubes, the exit of the lens Since the electrode is electrically connected to the screen potential, it has the disadvantage that it is difficult to maintain voltage resistance with other electrodes.

Further, Japanese Patent Publication No. 58-8543 and Japanese Patent Application Laid-Open No. 55-53858, filed by the applicant of the present invention, disclose a box-shaped lens having a slit. This consists of a lens generated based on a box divided into three or two parts, and a lens generated based on a slit on the target side surface of this box,
The interaction between these two lenses enables display with less vertical blur. However, the three-division method has the disadvantage that it is difficult to improve the assembly accuracy between each electrode because the intermediate electrode of the three-divided box-shaped lens has a convex or concave shape in both the cathode and target directions. be. In addition, in both the 3-split and 2-split systems, it is necessary to surround the first lun with a shield electrode in order to prevent the subsequent accelerating electric field from entering the approximately 1 m gap provided between each electrode for insulation. Yes, it was inconvenient. Furthermore, the provision of slits made the configuration complicated.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a meshless cathode ray tube that has a simple structure and is easy to manufacture.

Structure of the Invention To achieve the above object, the present invention includes an electron gun, a first deflection system that deflects an electron beam emitted from the electron gun in a first direction, and a first deflection system that deflects the electron beam emitted from the electron gun in a first direction. a second deflection system that deflects in a second direction perpendicular to the second direction; and at least one rear-stage electrode provided after the second deflection system; and an electron beam emitted from the electron gun. It includes at least a target and an electron lens disposed near the rear electrode, the electron lens including a first
and a second cylindrical electrode arranged so as not to wrap the end of the first cylindrical electrode on the electron gun side, but to wrap at least the end of the first cylindrical electrode on the target side with a gap. cylindrical electrodes, the first and second cylindrical electrodes are arranged such that their respective centers coincide with the tube axis, and the first and second cylindrical electrodes
The cylindrical electrode has first, second, third, and fourth surfaces arranged to have a substantially rectangular cross-sectional shape, and a pair of long sides of the substantially rectangular cross-sectional shape are arranged in the second direction. The first and second cylindrical electrodes are arranged such that a pair of short sides of the substantially rectangular cross-sectional shape extend in the first direction, and The ends of the first and third surfaces on the target side are formed in a concave or convex shape, and the ends of the opposing second and fourth surfaces of the first cylindrical electrode on the target side are formed in the first cylindrical shape. The first and third surfaces of the electrode are formed in a convex or concave shape that is curved in the opposite direction to the concave or convex shape at the end on the target side, and are swung in the first direction by the first deflection system. The traveling direction of the electron beam is set to the first and second directions.
The electron beam is inverted and deflected in the second cylindrical electrode by a quadrupole lens constituted by a cylindrical electrode, and deflected in the second direction by the second deflection system. The quadrupole lens produces an effect of deflecting and expanding the electron beam within the second cylindrical electrode, and the target-side opening of the second cylindrical electrode and the rear electrode cause the electron beam to be directed near the opening. A meshless cathode ray characterized in that a potential applying means is provided for applying a potential to the first and second cylindrical electrodes and the latter electrode so as to cause a lens action to focus the ray in a first direction. It is related to pipes.

Effects of invention According to the above invention, the following effects can be obtained.

(a) If the deflection is expanded only by the quadrupole lens formed by the first cylindrical electrode and the second cylindrical electrode, the deflection straight line in the first direction will be poor. However, the deflection straightness is improved by a focusing lens (convex lens) effect caused by a high electric field based on the subsequent electrode entering the opening at the end of the second cylindrical electrode on the target side.

Therefore, it is possible to provide a cathode ray tube with good deflection straightness in the first direction, although it has a simple configuration in which the first and second cylindrical electrodes are combined.

(b) A special shield member for shielding the first cylindrical electrode from the electric field of the subsequent electrode becomes unnecessary.

(c) Compared to the cathode ray tube of the present applicant which has slits, the structure is simpler due to the lack of slits.

Embodiment Next, an onroscope CRT according to an embodiment of the present invention will be described with reference to the drawings. The CRT shown in Figure 1 is
On the tube axis within the vacuum outer wall (1), there is an electron gun ( 7), this electron gun (
A vertical deflection plate (8) as a first deflection system that deflects the electron beam emitted from the 7) in a first direction (vertical direction) and a second deflection plate (8) that deflects the electron beam in a second direction (horizontal direction). A deflection system (1) consisting of a horizontal deflection plate (9) as a deflection system of
0), and a cylindrical electron lens (11) for deflection and magnification, and further includes a rear acceleration electrode α made of a conductive coating provided on the inner surface of the outer wall (11), and a target Q31. The electron gun (7), the deflection system (101, the post-acceleration electrode (121, and the Targetera) (13) are known parts, and the cylindrical electron lens (11) is a new part related to the present invention. ) (13) is a phosphor screen consisting of a face plate circle, a phosphor layer (151), and a conductive layer (16) connected to the rear acceleration electrode α2.

The electron lens U according to the present invention has first and second cylindrical electrodes, and the electric field of the second accelerating electrode (12) acts on the end of the second cylindrical electrode (18) on the target side. It is arranged like this.

In order to operate the CRT configured as described above, for example, -2.5 kV is applied to the cathode (2) and the first grid (3
), -2600 to -2500V, 0V to the second grid (4), -300 to +300V to the second anode (6), 17.5kV to the second accelerating electrode α2, 17.5kV to the electron lens (111)
+900V is supplied to the cylindrical electrode surface of the second cylindrical electrode (-11300V per second).The electron beam emitted from the cathode (2) is controlled in beam quantity by the first grid (3). It is accelerated by the second grid (4), then focused by a unipotential lens composed of the second grid (4) and the first and second anodes (51 (6),
Sent to OI. When the electron beam is swung in the first direction (vertical direction) by the deflection system 00), the traveling direction of the beam is directed to the second cylindrical electrode (l□□□) of the electron lens (11).
The polarization is inverted in the first direction, and the deflection is expanded in the first direction.

Furthermore, when the electron beam is deflected in the second direction (horizontal direction) by the deflection system αU, the second cylindrical electrode (+8
1, a deflection expansion in the second direction is performed.

Figures 2 to 9 show details of the electron lens (11) in Figure 1.
As is clear from the figure, the first cylindrical electrode (17) has the first, second, third and fourth surfaces 1ω(20) (211C
27: Support plate C which is formed into a flat rectangular cross-sectional shape with r and has a beam population e3)! 4).

The second cylindrical electrode (+81 is the first, second, third, and fourth plane 5) is formed into a flat rectangular cross-sectional shape having 261t2η(28), and the electrons of the first cylindrical electrode aη are The end on the gun side is exposed, but the end on the target side is arranged so as to wrap it.The first and second cylindrical electrodes (lη(1
81 (1851 and the 30th surface (2) opposite thereto) (a pair of long sides of each rectangular cross section produced by 2n as shown in FIG. 7 is in the second direction (horizontal direction) , and the pair of short sides of each rectangular cross section created by the second surface (201F261 and the fourth surface (22) (28) opposite thereto) is in the first direction (vertical direction)
The first and second cylindrical electrodes α7) (1
8) is placed on the tube axis.

Opposing first and third surfaces (19
) (Each tip on the target side of 21J is shown in Figures 2 and 3.
As shown in the figure and FIG. 8, it is formed in a concave shape like a part of a circle, ellipse, or hyperbola, and is concave in an arch shape toward the electron gun. In addition, the opposing second and fourth surface ends (the two target side ends (30) are shown in FIGS. 2, 4, and 9).
As shown in the figure, it is formed in a convex shape like a part of a circle, ellipse, or hyperbola, and protrudes in an arch shape toward the target.

The opposing first and third surfaces of the second cylindrical electrode (18)
2!1) As is clear from FIGS. 2 and 3, the target side end C31) of the C2 force is formed in a convex shape like a part of a circle, ellipse, or hyperbola, and protrudes toward the target. Also, as is clear from Figures 2 and 4, Yasukuni on the target side of 26J (2g+) is
formed into a concave shape like part of a circle or ellipse or hyperbola,
In the direction of the electron gun (blank).

C with a display screen of 8 cm in height and 104,771 cm in width
First and second cylindrical electrodes (171 (18)
For example, the geometric dimensions of the first cylindrical electrode (the vertical height of the L force is about 10 mm, the horizontal width is about 24 mm)
.

The length from the beam entrance (2) to the apex of the end (29) is approximately 21 mm, the length from the beam entrance (23) to the apex of the end (30) is approximately 24 mm, and the radius of curvature of the end wire is approximately 208 mm. , the radius of curvature of the end (g) is about 6 fins, the height of the second cylindrical electrode 08) is about 146 mm, the width in the horizontal direction is about 36 fi,
The length from the left end to the apex of end C3υ is approximately 33M, the length from the left end to the end (3) is approximately 26 m, the radius of curvature of end Gll is approximately 46 fi, the radius of curvature of end 64 is approximately 1OTrr
In.

In addition, the first and third surfaces (1, 1 (
21) and the first and third surfaces of the second cylindrical electrode α mark (25
1G'O and the gap C31) is approximately 1.5fl each.
1 m, the second and fourth surfaces of the first cylindrical electrode (lη (20
) (The gap between the second and second cylindrical electrodes (181) is 5.5 mm, respectively. Note that each cylindrical electrode (17108+ has a thickness of 0 .5 rrar
Made of + non-magnetic stainless copper. Also, the first
The cylindrical electrode (In is arranged in a state of being electrically insulated and separated from the second cylindrical electrode 081, is fixed together with the electron gun deflection system, and has an independent potential potential as shown in FIG. 1). It is equipped with a lead member for feeding.

Next, referring to FIGS. 10 and 11, the electron lens (11
) to explain the trajectory of the electron beam. Now, for example, +900V (vs. cathode +3400V) is applied to the first cylindrical electrode Q71.
), if an electron lens is configured by applying, for example, -1300 cm (+1200 V to the cathode) to the second cylindrical electrode α mother and, for example, 17.5 kV to the post-acceleration 1i pole (I2), the first
As shown in Figure 0, the electron beam (33) swung in the vertical direction (first direction) or (13 the force does not advance as shown by the dotted line, but the first cylindrical electrode 07 as shown by the solid line). The traveling direction is reversed by the focusing lens action of the quadrupole lens (hereinafter referred to as the internal lens) composed of the second cylindrical electrode 081, and the target side opening (exit ) (hereinafter referred to as aperture lens)
Then, it is further subjected to the action of a convex lens and reaches step (131).As a result, the beam (g) or 04) deflected in the vertical direction is deflected and expanded by the electron lens Ql).

On the other hand, as shown in Fig. 11, the electron beam G5) or 06) swung in the horizontal direction (second direction) does not advance as shown by the dotted line, but due to the diverging lens action of the internal lens, it moves in the horizontal direction as shown by the solid line. The target (131
reach. Note that, based on the aperture lens, the beam (36) that is swung relatively widely is subjected to a weak convex lens effect and is slightly deflected and reduced, and the beam (39) with a small deflection angle is hardly affected by the convex lens effect at the aperture. , there is almost no deflection reduction.

By the way, the four surfaces (191 to 191) of the first cylindrical electrode Q71
(2 cylindrical electrodes (2 cylindrical electrodes) (4 sides of 1 second (29~(
The beam C331 (3
Even if the deflection is expanded to 41, good vertical deflection directness cannot be obtained. In other words, in the internal lens, as the vertical deflection angle increases, the deflection magnifying effect becomes stronger.
The positive tendency of deflection directness becomes large. However, in this embodiment, an electric field based on the second accelerating electrode 0 is applied to the exit of the second cylindrical electrode Q81, and as shown by the equipotential line 0D in FIG. Let the electric field enter,
A convex lens effect (aperture lens) is generated here, thereby improving the deflection straightness. That is, the beam C331G341 swung in the vertical direction is deflected and expanded by the action of reversing the traveling direction by the internal lens, and then the beam C331G341 is swung at the equipotential line (3η
The aperture lens shown in is also deflected and magnified. On this occasion. - Differences in the incident angle and position of the beam with respect to the aperture lens cause differences in the deflection amplification effect, and as the deflection angle increases, the deflection amplification effect by the aperture lens becomes smaller.

As a result, the deflection straightness in the vertical direction is improved.

The same can be said about the horizontal deflection straightness. That is, the horizontal deflection straightness based on the internal lens is
The positive trend becomes dog as the deflection angle increases. but,
As shown in FIG. 11, an aperture lens based on the equipotential line C mark is formed near the exit of the second cylindrical electrode αa, which has almost no effect on the beam C33) swung in the horizontal direction. The deflection of the thick beam (341) is reduced. At this time, the deflection becomes smaller as the horizontal deflection angle increases. As a result, the deflection straightness in the horizontal direction is improved.

The opening lens near the opening of section 0 of the second cylindrical electrode is
As shown in Figure 2, it also has a focus correction function.

As in this embodiment, if the design is designed to reverse the traveling direction of the beam swung in the vertical direction and increase the vertical deflection sensitivity, it is possible to ) Q3) changes depending on the amount of vertical deflection, and if there is no aperture lens at the exit of the second cylindrical electrode (181), then the distance to the dotted line (4 (
When focused at e, the beam spot becomes blurred in the vertical direction of the screen. However, in Fig. 12, since the aperture lens has a focusing effect that differs depending on the angle of incidence of the beam, it focuses on the unpolarized beam (41) and the vertically swung beam (all 4 are target 03). It is corrected as follows. That is, the unpolarized beam (41)
(Tagutsu) (With the same focus voltage as that used to focus on 131, the vertically swung and inverted beam +421 can also be imaged on the target Q3.

If the vertical focus and horizontal focus of the electron beam in this CRT are shown by optical analogy, FIG.
3). The lens (43 (44
1 is a lens composed of an electron gun (second grid (4) in force and first and second @poles f5J (6), (45I (461 is inside the cylindrical electron lens aD) (47) is the second lens.
It is a lens at the exit of the cylindrical electrode (181), and the beam spot (40 to 5 indicates the cross-sectional shape of the beam spot on the chain lines (53) to 6e.

Note that in FIG. 13, a pattern distortion correction lens constituted by a first cylindrical electrode (17) and a pair of horizontal deflection plates (9), which will be described later, is omitted.

End CI of the first cylindrical electrode αD! 9) 430) and the second cylindrical electrode (end 01 of l) are formed in a concave or convex shape to improve butter distortion. However, it is difficult to eliminate pattern distortion based only on the shape of the edges (291 to (32) of a single curvature. A simple curved shape with a radius is used, and the bottle cushion distortion caused by this is calculated as shown in Fig. 14.
Correction is made by a quadrupole lens configured based on the electron gun side end of the cylindrical electrode (171) and the target side end of a pair of horizontal deflection plates (9). In other words, the bottle cushion generated by the lens inside the mold Level distortion is generated in advance on both the top and bottom and left and right sides to correct the distortion. In this case,
There is some pattern distortion when applying deflection voltage, but it can be almost ignored.

Next, the relationship between the dimensions of each part and the lens action will be explained in more detail.

What is responsible for the characteristics of the lens at the exit of the second cylindrical electrode αa is the radius of curvature of the end C3υ field and the vertical and horizontal widths of the second cylindrical electrode 08). For example, the radius of curvature of the end (31) is
When reducing the wavelength from about 46+o+ in the first embodiment to about 4Q+nm, the overall horizontal sensitivity improves and the horizontal deflection straightness tends to be positive. For example, the radius of curvature of the end (32) is reduced to about Approximately 201111 from the key of 10
If it is increased to 1, the high electric field of the second accelerating electrode (12+) will be difficult to enter from both sides of the exit of the second electrode (181), so the horizontal sensitivity near both horizontal ends of the screen tube surface will be reduced. , and the deflection straightness tends to be negative.If the end Oυ is made extremely straight, the sensitivity in the horizontal direction deteriorates by Also, for example, the vertical width of the second electrode tta (
height) serves to correct the positive tendency of the vertical deflection directness of the internal lens by adjusting the vertical penetration of the high electric field into the second electrode (13).

Next, it will be explained how the nozzle on the screen tube surface caused by the internal lens is affected by the change in the radius of curvature of the end C29) of the first electrode.

For example, if the radius of curvature at the end of the first electrode η is reduced from about 6 m to about 5.5 m, the vertical emission line will move in the direction that causes barrel distortion, and the horizontal emission line will move in the opposite direction. For example, the radius of curvature of the edge (2 wells) tends to be distorted.
When decreasing from 0 mm to approximately 1711011, the vertical bright line tends to cause bottle cushion distortion, and the horizontal bright line tends to cause barrel distortion. Furthermore, it is clear that the direction in which the radius of curvature is made smaller is the direction in which the deflection ratio is improved both in the case of the end (29) and in the case of the end (29), since the inner lens is made stronger.

As is clear from the above, the total length of the cathode ray tube and the sensitivity are 1. Select the first electrode (1
Once the dimensions and radius of curvature of 71 are determined, the dimensions and radius of curvature of the second electrode α sand are determined correspondingly, and the desired horizontal and vertical deflection sensitivities and deflection directness are satisfied while at the same time pattern distortion remains. If there is, (mostly bottle cushion distortion) the first electrode (the cathode side entrance part of the ID and the exit part of the horizontal deflection plate (9) is corrected with a quadrupole lens. In other words, the first electrode (The geometrical dimensions between 171 and the second electrode 60 are interdependent.

As is clear from the above, this embodiment has the following advantages.

Although the configuration is simple, it is possible to obtain large deflection magnification, good horizontal and vertical deflection straightness, good focus state, and low pattern distortion state.

Since the first cylindrical electrode Qn (181) is surrounded by the second cylindrical electrode (181), it is shielded from the subsequent acceleration electrode (121).Therefore, no shield is required, and the configuration is simplified.

(C) The voltage of the first cylindrical electrode a'r is set to, for example, O~
Since the pattern distortion can be corrected by varying it within the range of 900 square meters in relation to the horizontal deflection plate (9), the pattern distortion can be easily corrected.

Modifications The present invention is not limited to the above-described embodiments, but can be modified, for example, as follows.

(a) First and second cylindrical electrodes (17) of the example (
The second and fourth aspects of Is+ (2)! 22+(c)(2)
may be deformed to widen toward the target as shown in FIG.

(b) The direction of the unevenness of the first and second cylindrical electrodes (171 (18) to 64 shown in FIGS. 1 to 9) is
It may also be reversed as shown in the figure. In this case, for example, -1200V to -1500V is applied to the first cylindrical electrode αD, and the second
For example, a voltage of OV to +900 cm is applied to the cylindrical electrode (181).

(c) It is also applicable to a CRT in which three sets of quadrupole lenses 157158169 are provided as focusing lenses in the electron gun portion as shown in FIG. Also, as shown in Figure 18 (,
It is also applicable to CRTs that include one quadrupole lens track between the vertical deflection plate (8) and the horizontal deflection plate (9).

(dl Instead of constructing a pattern distortion correction lens with the cathode side inlet portion of the first cylindrical electrode a force and a pair of horizontal deflection plates (9), as shown in FIG. ] υ as shown in FIG. For example, the first cylindrical electrode (In OV~90
0■, -1300■ may be applied to the second cylindrical electrode α8), and pattern distortion may be corrected using a quadrupole lens constituted by a correction electrode portion and a cylindrical electrode (1η cathode side inlet).

(e) Vertically long opening 03 as shown in Fig. 22
) and a second correction electrode (66) having an elongated opening in the horizontal direction are aligned with the tube axis to form a pair of horizontal deflections as shown in FIG. Board (
9) and the first cylindrical electrode (In), for example, OV for one electrode (64) and 0 to 90 for the other electrode (65).
0V, θ ~ 900V to the first cylindrical electrode (ID), -1300V to the second cylindrical electrode (I), and the first and second correction electrodes (64) (consisting of 651) Pattern distortion may be corrected with a quadrupole lens.

(f) As shown in Figures 23 and 24, the end (29)
〜A curve with the least pattern distortion, and a correction lens using the first cylindrical electrode αD and the horizontal deflection plate (9), or a lens or electrode using the electrode (641 (66)
The lens may be omitted. In this case, for example, OV is applied to the first cylindrical electrode a force, and -1300 V, for example, is applied to the second cylindrical electrode (18).

(g) In the embodiment and the modified example, the first and second cylindrical 't
Although K 4ffl (lη08) is a perfect rectangle, it is of course possible to use a substantially rectangular shape with smoothed curvature at the corners.

(h) When the width of the second cylindrical electrode 1810 is large, the end 62 may be made straight. Further, the horizontal sensitivity may be made straight (if it is not necessary, end C31).

(The same effect can be obtained even if an electric field is applied to the exit of the second cylindrical electrode (18) by an electrode other than the rear acceleration electrode Q21. Therefore, a CRT having a rear electrode other than the rear acceleration electrode α2 For example, it can also be applied to storage tubes that have a collimation electrode as a subsequent electrode.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a CRT according to an embodiment of the present invention;
2 is a perspective view schematically showing the electron lens of the CRT in FIG. 1, FIG. 3 is a plan view of the electron lens in FIG. 2, and FIG. 4 is a front view of the electron lens in FIG. 5 is a left side view of the electron lens in FIG. 3, FIG. 6 is a right side view of the electron lens in FIG. 9 is a front view of the first cylindrical electrode, FIG. 10 is a beam trajectory diagram showing the vertical action of the electron lens, and FIG. 11 is a horizontal view of the electron lens. A beam trajectory diagram showing the action, Figure 12 is a beam trajectory diagram showing the vertical focus of the electron lens, and Figure 13 is C in Figure 1.
A beam trajectory diagram showing the vertical and horizontal focus of the optical analogy of RT, Fig. 14 is a side view showing the Nokuturn distortion correction lens part as seen from the cathode side, and Figs. 15 and 16 show modified electron lenses. 17 and 18 are schematic perspective views, FIG. 17 and 18 are cross-sectional views showing modified CRTs, FIG. 19 is a cross-sectional view showing modified CRTs, and FIG.
A front view of the correction electrode of RT, FIG. 21 is a sectional view showing a modified CRT, FIG. 22 is a perspective view showing the correction positive electrode of the CRT of FIG. 21, and FIG. 23 is a plan view showing a modified electron lens. 24 is a front view of the lens of FIG. 23. (7)...electron gun, (10)...deflection system, (111
...Electronic lens, U...Late accelerating electrode, (13).
...Target, distributor...first cylindrical electrode, a81...
・Second cylindrical electrode, ■...first surface, (20)...
2nd surface, (21)...3rd surface, (221...th, 40th surface, 0■...1st surface, (26)...2nd surface, shin... ...3rd side, (c)...40th side, (2
9) to 63...edge. Agent Noriyuki Takano 1 and Figure 2 i01 Figure 13 T': IULJV Figure 15 Figure 16 Figure 17 G) Figure 19 Figure 23 O ■ Figure 24 Procedural amendment (voluntary) 11 (i September 22, 1982 141 Displays 1982 Patent Kenbu No. 132289 2 Name of the invention Metsuless cathode ray tube 3 Relationship with the person making the amendment 4 Applicant 4 Agent 11 Can be made after the applicant Kazuo Wakasugi, Commissioner of the Japan Patent Office, 1. Indication of the case 1982 Patent Kenbe No. 132289 2. Name of the invention: Metschless cathode ray tube 3. Relationship with the person making the amendment: Applicant 4, Agent 8. Amendment) Contents As shown in the attached sheet. il+ Add "small" after "horizontally" on page 26, line 13 of the specification. (2) Add "." after "let" on page 30, line 3 of the specification. Procedural Sleeve Letter (spontaneous) May 25, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office, 1981 Patent Kenbe 132289 Yumi 2 Title of the invention Menschless cathode ray tube 3 Relationship with the person making the amendment 1 Application Person 4 Agent 5 El of amendment order (4 Spontaneous 6 Number of inventions increased by amendment Figure 1

Claims (1)

[Claims] An il+ electron gun, a first deflection system that deflects the electron beam emitted from the electron gun in a first direction, and a second deflection system that deflects the electron beam in a first direction. a second deflection system that deflects the electron beam in a direction, at least one rear electrode provided after the second deflection system, a target for impacting the electron beam emitted from the electron gun, and a target for impacting the electron beam emitted from the electron gun; an electron lens disposed nearby, the electron lens does not cover the first cylindrical electrode and the end of the first cylindrical electrode on the electron gun side, but at least covers the first cylindrical electrode.
The end of the cylindrical electrode on the target side is composed of a second cylindrical electrode arranged to surround the cylindrical electrode with a gap, and the center of each of the first and second cylindrical electrodes coincides with the tube axis. the first and second cylindrical electrodes have first, second, third, and fourth surfaces respectively arranged to have a substantially rectangular cross-sectional shape, and the cross-sectional shape is substantially rectangular. The first and second cylindrical electrodes are arranged such that a pair of long sides of the substantially rectangular cross-sectional shape extend in the second direction, and a pair of short sides of the substantially rectangular cross-sectional shape extend in the first direction, and Target-side ends of the opposing first and third surfaces of the first cylindrical electrode are formed in a concave or convex shape, and the opposing second and fourth surfaces of the first cylindrical electrode are formed in a concave or convex shape. The Kugt side end is formed in a convex or concave shape that is curved in the opposite direction to the concave or convex shape of the target side ends of the first and third surfaces of the first cylindrical electrode, and the first deflection an action of reversing the traveling direction of the electron beam swung in the first direction in the system within the second cylindrical electrode by a quadrupole lens constituted by the first and second cylindrical electrodes, thereby deflecting and expanding the direction of the electron beam; and causes the electron beam deflected in the second direction by the second deflection system to be deflected and expanded within the second cylindrical electrode by the quadrupole lens, and The first and second cylindrical electrodes and the rear stage electrode are arranged so that the target side opening of the shaped electrode and the rear stage electrode produce a lens effect that focuses the electron beam in the first direction near the opening. A mesh-less cathode ray tube characterized in that it is provided with a potential applying means for applying a potential to the terminal. (2) The first and second cylindrical electrodes are formed to widen toward the target.
Metschless cathode ray tube as described in . (3) The meshless type according to claim 1 or 2, wherein the first and third surfaces of the second cylindrical electrode have target-side ends formed in a convex shape. cathode ray tube. (4) The second and fourth surfaces of the second cylindrical electrode are
A meshless cathode ray tube according to claim 1, wherein the cathode ray tube has a concave end on the target side. (5) The first cylindrical electrode is disposed at a position where a quadrupole lens effect for correcting knock-turn distortion occurs between its end on the electron gun side and the second deflection system, and the potential is Claim 1, 2, 3, or 4, wherein the applying means applies a potential to the first cylindrical electrode so that the quadrupole lens for correcting the no-turn distortion is generated. Metschless cathode ray tube. (6) The mesh-less cathode ray tube according to claim 1 or 2 or 3 or 4 or 5, wherein the rear electrode is a rear acceleration electrode, and the target is a fluorescent screen. . (7) an electron gun; a first deflection system that deflects the electron beam emitted from the electron gun in a first direction; and a first deflection system that deflects the electron beam in a second direction orthogonal to the first direction. Second
a deflection system, at least one rear electrode provided after the second deflection system, a target for impacting the electron beam emitted from the electron gun, and an electron disposed near the rear electrode. at least a lens;
The electron lens includes a first cylindrical electrode and an end of the first cylindrical electrode on the electron gun side. and a second cylindrical electrode arranged so as to surround the first and second cylindrical electrodes, the first and second cylindrical electrodes are arranged so as to coincide with their respective central Kerr tube axes, and the first and second cylindrical electrodes The cylindrical electrode has first, second, third, and fourth surfaces arranged to have a substantially rectangular cross-sectional shape, and a pair of long sides of the substantially rectangular cross-sectional shape are arranged in the second direction. and the first and second cylindrical electrodes are arranged such that a pair of short sides of the substantially rectangular cross-sectional shape extend in the first direction, The ends of the first and third surfaces on the target side are formed in a concave or convex shape, and the ends of the opposing second and fourth surfaces of the first cylindrical electrode on the target side are formed in the first cylindrical shape. The first and third surfaces of the electrode are formed in a convex or concave shape that bends in the opposite direction to the concave or convex shape at the end on the target side, and are swung in the first direction by the first deflection system. The traveling direction of the electron beam is reversed within the second cylindrical electrode by a quadrupole lens constituted by the first and second cylindrical electrodes, and the second cylindrical electrode is deflected and expanded. The electron beam deflected in the second direction by the deflection system is deflected and expanded within the second cylindrical electrode by the quadrupole lens, and the target (I' A potential is applied to the first and second cylindrical electrodes and the rear electrode so that the L1 opening and the rear electrode produce a lens effect that focuses the electron beam in the first direction near the opening. Further, a pattern correction electrode for correcting buttery distortion due to the electron lens is provided between the second deflection system and the first cylindrical electrode. A meshless cathode ray tube characterized in that: (8) The pattern correction electrode is one electrode having a longitudinal opening in the first direction.
Metschless cathode ray tube as described in . (9) The pattern correction electrode is composed of a combination of a first correction electrode having a longitudinal opening in the first direction and a second correction electrode having a longitudinal opening in the second direction. A meshless cathode ray tube according to claim 7.