JPS62246236A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain a deflection expanding lens with a wider effective aperture and a larger intensity, and to realize a CRT with a high sensitivity and a shorter full length, by furnishing a pair of tongues and applying a voltage same as the voltage applied to the screen, to the second cylindrical electrode. CONSTITUTION:A deflection expanding lens 12 has a pair of tongues 25 and 26, and the pair of tongues 25 and 26 have a pair of brims extending straight in the direction to the z axis. Moreover, the deflection expanding lens 12 consists of the first and the second cylinrical electrodes 18 and 19, and the first cylindrical electrode 18 is connected to the ground while the second cylindrical electrode 19 is connected to the latter phase acceleration electrode 17 by a lead wire 20. The voltage 0 V (ground potential) is applied to the first cylindrical electrode 18, while the voltage +14 V equal to the voltage of the latter phase acceleration electrode 17 is applied to the second cylindrical electrode 19. As a result, an intense electron lens with a low distortion is formed in the opposing space of the tongues 25 and 26, and a CRT of a high sensitivity and a shorter full length can be acquired.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to cathode ray tubes (CRTI) for use in oscilloscopes, storage oscilloscopes, etc., and more specifically relates to a deflection magnifying electron lens for cathode ray tubes. [Problem] It is possible to arrange a cylindrical deflection magnifying electron lens between the deflection system and the screen.
No. 4,302,704. The deflection-magnifying electron lens first disclosed in Japanese Patent Laid-Open No. 59-13453 includes two cylindrical electrodes constituting a quadrupole lens, and further has a slot lens at the entrance of the quadrupole lens and an aperture lens at the exit. Therefore. The structure of this deflection-magnifying electron lens is very complicated. The deflection and magnification electron lens disclosed in the latter US patent includes a quadrupole lens consisting of electrodes with a rectangular cross section, and has a relatively simple construction. However, there is no disclosure of a specific method for producing an electron lens that is highly sensitive and has a short overall length (?RT).Therefore, an object of the present invention is to create an electron lens with a relatively simple configuration. We provide wide and strong polarization magnifying lenses,
The objective is to provide a CRT with high sensitivity and short overall length. [Means for Solving the Problems] The present invention, which is intended to achieve the above objects, includes an electron gun and an electron beam emitted from the electron gun. a first deflection system that deflects the electron beam in a first direction; and a second deflection system that deflects the electron beam in the first direction.
a second deflection system that deflects in the direction of;
a screen for impacting the electron beam emitted from the electron gun; It comprises at least a deflection magnification electron lens disposed between the deflection means and the screen, and the deflection magnification electron lens includes first and second cylindrical electrodes (It) (II) disposed coaxially. The first cylindrical electrode α&
are arranged symmetrically about the x-z plane, where the first direction is the y-axis, the second direction is the y-axis, and the traveling direction of the electron beam when not deflected is the two axes. The first pair of faces (2
D (company) and a second pair of surfaces 123104 arranged symmetrically about the yz plane. The second cylindrical electrode has a third pair of surfaces @■ arranged symmetrically about the x-z plane, and a fourth pair of surfaces @■ arranged symmetrically about the y-z plane. and a pair of tongue-shaped portions protruding in the screen direction or the electronic needle direction on at least one of the pair of surfaces (2nca and the fourth pair of surfaces 3!1 (to)). provided, the pair of tongues having a pair of e portions extending parallel to the z-axis, K on the tongues, and having a pair of e portions extending parallel to the z-axis;
'The first and second cylindrical electrodes (18) Q9 are arranged so that the fourth pair of surfaces (2!1c!) are located on both sides of the first pair of opposing spaces. A plate Oυ having an mK percha (4Q) is arranged on the side of the second cylindrical electrode α9, and the voltage applied to the second cylindrical electrode α is equal to or close to the voltage applied to the screen. A quadrupole lens is provided with means for applying a voltage, and is configured to direct the traveling direction of the electron beam deflected in the first direction by the first deflection system to the first and second cylindrical electrodes 081. the first and second beams so as to cause the electron beam to be inverted and deflected and expanded by the second deflection system, and to cause the quadrupole lens to deflect and expand the electron beam swung in the second direction by the second deflection system. The present invention relates to a cathode ray tube characterized in that the potential of the cylindrical electrode -0 of No. 2 is determined.
This pair of tongue-shaped portions has a pair of green portions extending in a T[M shape in two axial directions. The second cylindrical electrode a9 is applied with a voltage that is the same as or even equal to the voltage applied to the screen (later acceleration voltage).As a result, the pair of tongues (251@) are A strong electron lens with low distortion is formed, making it possible to provide a CRT with high sensitivity and short overall length.By changing the shape of the tips of the pair of tongues,
Although the analogy of emission lines parallel to the surface is favorable, the distortion based on this can be corrected by the aperture (4) on the screen side. Based on the potential difference between the shaped electrode α& and the second cylindrical electrode a9, a concave lens is formed in both the y-direction and the y-direction. [First Embodiment] Next, a first embodiment of the present invention The CRT of the related oscilloscope will be explained.The CRT shown in the first factor has 55! gun (51
including. The path of the electron beam emitted from the electron gun (5) includes an aberration correction electron lens (61), first and second quadrupole lenses (71 (81), vertical deflection system (91, third quadrupole lens αα, Horizontal side similar type αD1 Polarized magnifying lens (121 are arranged in sequence) according to the present invention. Image light screen 03
1 is. It is constructed by applying a light material (15) to the face plate and providing a conductive layer (06) thereon. A rear acceleration electrode OD is provided on the inner wall of the funnel f49 (1a) of the tube body (11), and this rear acceleration electrode aη is connected to the conductive layer αe of the light regulating screen α3. Consisting of first and jg2 cylindrical electrodes a and α, the first cylindrical electrode 0 seconds is connected to the ground, and the second cylindrical electrode α is connected to the rear acceleration electrode αη.
It is arranged so that it is slightly surrounded by , and is connected to the subsequent accelerating electrode aη by a conducting wire . This CRT canard (2) is an example)'! -2kV
DC voltage, control grid (3) has cand (2)
0 to] 00 V as low as 2.
y kV, 7/- field (4) has OV (ground potential), aberration correction electron lens, ((351 +2-50 to +50 V, j kUta 2 quadrupole lens (7
1 (positive and negative voltages of 0 to 400V for 81, 0 to -4oQv for a pair of voltages ft!! of the third quadrupole lens αω,
The remaining pair of electrodes has OV (ground potential), the second accelerating electrode α has +14 kV, the first cylindrical electrode (181 has OV (ground potential), the second The cylindrical electrode a9 has a rear acceleration electrode α.
Apply +14 kV, which is the same as η. The structure and operation of the CRT other than the deflection and magnification electron lens az are the same as those of known CRTs, and the amount of electron beam emitted from the cando (2) is controlled by the control grid (3), and then the electron beam is sent to the anode ( 4) and aberration correction electronic lens (6)
1 and enters the first quadrupole lens (7). For the quadrupole lens (7) of . The electron beam is focused in the X-Z plane and diverged in the y-z plane. The second quadrupole lens (8) causes the electron beam to diverge in the X-Z plane and converge in the Y-Z plane. The 30th quadrupole lens aα focuses the electron beam on the X-Z plane and diverges it on the y-z plane. Vertical deflection system (91 deflects the beam in the vertical (y) direction in response to the vertical deflection signal (observation signal) supplied here, and horizontal deflection system 0υ responds to the sacroclinal voltage supplied from the sweep circuit. The beam is deflected in the horizontal (X) direction.The deflection magnifying electron lens α2 according to the present invention focuses the electron beam in the y-z plane and diverges it in the y-Z plane. An electron beam incident with a deflection angle in the y and y directions is deflected and expanded in both the y and y directions. 'I/1 polar beam accelerates the electrons and reduces the brightness of the image on the screen.The beam that is vertically deflected and enters the deflection magnifying electron lens 02 is subjected to a strong focusing action, and its The direction of movement is reversed.Next, the deflection magnifying electron lens (121) according to the first embodiment of the invention will be explained in more detail with reference to FIGS. 2 to 9.
Ajru. As is clear from FIG. 3, the cylindrical electrode α group 1231 (2
(b), and are formed symmetrically around the x-z plane and the y-z plane, respectively. The length of the second pair of surfaces (231G!41 is significantly shorter than the first pair of surfaces (2+1
A pair of tongue-like parts (251t261) protrude in the direction of the screen from a cylindrical part with a substantially square cross-sectional shape. Two linearly extending IIR parts L) 5a) (25b) (2f'1a)
(26h). The tip IFIs (25c) (26c) of the pair of tongue-shaped W15 (25@) are curved appropriately to correct the pattern design.As is clear from Fig. 4, they protrude in an arch shape toward the screen side. Second pair of surfaces (c) M part on the screen side of Q7

The curves [23a and 24a) are also formed into appropriate curves to correct pattern distortion, and as is clear from FIG. 5, they curve in an arch shape toward the cand side. As is clear from FIGS. 2, 3, and 7, the first and second pairs of surfaces 011 @@041 are arranged in order to obtain a field that approximates the ideal hyperbolic equipotential field. It is formed as a convex quadratic curved surface (hyperbolic surface) toward the tube axis.The first pair of surfaces Qυ are arranged along the x-z plane, and the second pair of surfaces 031 The second cylindrical electrode α9 is arranged along the y-z plane. As is clear from FIGS. 2 and 7, the second cylindrical electrode α9 , the fourth pair @J@(
The first cylindrical 1! It is arranged so as to surround at least one pair of tongue-like parts (C)■ of the poles α&. The third pair of surfaces (271@) are arranged along the y-z plane, the fourth pair of surfaces (to) are arranged along the y-z plane, and both surfaces are arranged along the y-z plane. It is formed into a quadratic curved surface (hyperbolic surface) convex toward the axis.
1) The width W1 of (2) is the width W1 of the second pair of surfaces (231 (24)
The width W of the third pair of surfaces @ the width W of the third pair is somewhat narrower than the width W of
3 is somewhat narrower than the width W4 of the fourth pair of surfaces (to) (2). The width W of the second pair of surfaces I231I241 is approximately equal to the width W3 of the third pair of surfaces @(to). Therefore, the first pair of surfaces at 8 on the X-axis in FIG. The opposing spacing of @ (to) is almost equal.In order to obtain an ideal hyperbolic equipotential field as shown by equipotential g! , W, -0,2W2≦W3<w, +0.2
It has been confirmed that if W, , W3 are determined so as to satisfy W2, a near-ideal quadrupole lens field can be obtained. Considering the electrical discharge between the first cylindrical electrode a& and the second cylindrical electrode α9, W4-W? ≧fimm. It is necessary to satisfy W, −W, ≧ fi mm. In the example, W+= ] Fi mm, W2= 2
0 mm, %, = 24 mm, W4 = 28 mm
is set to il. Each side 1211■(c)c! ooze (5)
Is the curve of Qe (to) a rectangular hyperbola x2-y? It is determined that an equipotential field of =a2 is obtained in the space of the tongue (c). Second cylindrical 1! A plate having an aperture frame is arranged at the end of the pole a9 on the screen side. Completed parcha (4)
As is clear from Fig. 6, the center of G coincides with the tube axis.
The first pair of sides (40a) (40h) are formed so that the mutual distance in the y-axis direction is closest at the center and gradually increases as it goes to both sides. has a second pair of sides (40C) (4(ld)) formed such that the mutual spacing in the y-axis direction is widest at the center and gradually narrows toward both sides. A pair of tongue-shaped sides. The shape of the tips *(25c) and (26c) of part (c)■ is related to the pattern φ, and if there is a concave shape on the cand side, the bright line parallel to the Y-Z plane will be distorted by the barrel. -If it protrudes in an arch shape toward the screen as in this embodiment, it will tend to be a bottle cushion.The shape of the tips [25c] (26C) is Y
- Although it slightly affects the emission line parallel to the Z plane, this effect is due to the opposite side of ta2 (c) (241 end (23a) (24
It is extremely small compared to the shape in a). It is desirable that the second pair of surfaces (ends (23a) and (24a) on the side of the square I+ of 231C241 (23a) and (24a) be recessed in a 7-ch shape toward the cand side.
The shape of 4a) is a pattern distortion of the emission line parallel to the y-2 plane, which affects the deflection straightness in the y direction and the y direction. The depth of the edges C23a) and (24a) is made constant,
When the curve of this depression is varied into a parabola, hyperbola, y-curve, etc., and the curvature at the center of the depression is increased, the shape of the emission line parallel to the y-z plane changes in the barrel direction, and Directional deflection straightness extends. In addition, if the depth of the curve is increased without depending on the type of curve of the end portions (23a) (24a), the bright line parallel to the yz plane curves toward the barrel, and the X The deflection rate in the direction and the X direction @ kneadability increases. The distance in the axial direction from the center of the tip (?5cH?6c) of the tongue (c) (b) to the center 1 of the ends 1 (23a) (24a) of the second pair of surfaces @@, and the tongue The linearly extending edge (?5a) (25h) (2Fia) (
The length of 2Rb) is 8 times the strength of the quadrupole lens, and as it becomes longer, the concave lens effect in the y direction is y
The convex lens effect in both directions becomes stronger, and the deflection sensitivity improves. However, the length Ll affects the deflection straightness in the X direction. As L becomes shorter, the directness of deflection in the X direction increases, and as it becomes longer, it contracts, so it must be set at an appropriate value. According to experiments, from the center of the tip of the tongue-shaped portion c25) (26) to the end of the second pair of surfaces t23c241 (
23a) It is recognized that if the distance on the y-axis at the center part 1 of (24a) is preferably within the range of W, ±0.2W, the linearity of the deflection rate in the Y direction will be improved. ing. As is clear from the above, in this deflection magnifying lens, the length of the tongue I25I must be used to deflect the deflection FIg in the y direction.
The linearity changes, and the tongue-shaped part @ (A) protrusion part (25c) (
If the shape of 26e) is changed to 'lzr:yR, the shape of the emission line parallel to the x-z plane and the polarization straightness in the ) (24a)
If the shape of is changed, the shape of the emission line parallel to the yz plane changes. Note that due to the shape change of the end portions (23a) (24a),
The deflection straightness in the direction also changes -r, but this is extremely small compared to the change in the deflection straightness in the X direction due to changes in the tongues (c) and (a). Further, a change in the directness of deflection in the X direction due to a change in the shape of the end portions (23a) (24a) can be corrected by using the length LL of the tongue (a). Therefore, if the shape of the emission line parallel to the x-z plane and the deflection rate in the X direction can be changed by -1 without significantly affecting the other, then The shape of the emission line parallel to the y-z plane and the polarization straightness in the y and y directions can all be optimally set. With the polarizing magnifying lens of this example, W! / As Wl increases, the shape of the emission line parallel to the X-2 plane does not change significantly. Since the deflection rate in the X direction is reduced, the above-mentioned best setting can be implemented with W2/Wl. In addition, the pair of tongue-shaped parts (to) - wo long comb, and this tip (
25c) (By protruding 26υ in an arch shape toward the screen direction, the emission lines parallel to the j + Length ff1.l of the second cylindrical electrode a9 from the tip of the first pair of tongues (25c) (2fic) to the second cylindrical electrode α
As the distance at the end (27a)C28a)1 on the clean side of the field becomes longer, the shapes of the emission line parallel to x-zffiI and the emission line parallel to the y-z plane both change in the barrel direction, and y and a deflection in the X direction of 1! - Linearity increases together. Furthermore, when the shape of the screen-side end (27aH28a) of the third pair of surfaces @ of the second cylindrical electrode α9 is an arch-like curve protruding toward the screen, the x-z plane and the y- The shape of each emission line parallel to the two surfaces changes in the barrel direction, and the deflection straightness in the X direction and the X direction increases. Furthermore, if the ends (27a) and (28a) are formed into an arch shape that is tapered in the direction of the screen, the characteristics will be opposite to those in the case where the ends (27a) and (28a) protrude in the direction of the screen. In this example, the second accelerating electrode α and the second cylindrical electrode ? The voltage at the pole α is set to 14 kV (16 to 1 for the cand, but as this voltage is increased, the lens action becomes stronger and the deflection sensitivity in the y and x directions improves. At this time, the deflection straightness in the y and x directions shrinks,
In addition, the emission line parallel to the X-Z plane changes in the barrel direction, and the y-
The emission lines parallel to the z-plane change in the pincushion direction. As shown in FIG. 8, the beam 02 is deflected in the horizontal direction (X direction) and is incident on the first cylindrical electrode 081. Due to the concave lens action determined by the distribution of equipotential lines in the X-Z plane, the beam is deflected and expanded in the horizontal direction. As shown in the ninth factor, the first
cylindrical electrode (fill incident beam C34a) or (
34b) or (34C) is focused by the convex V lens action determined by the equipotential #(t)no distribution in the y-z plane, and its traveling direction is reversed to cross the X-Z plane and deflected and expanded. Ru. With this polarizing magnifying lens, you can use Hee! (3
4a), (34b), and (34) intersect with the X-Z plane within the space in which the pair of tongue-shaped portions wm face each other. Such a lens effect can be obtained by increasing the length of the tongue portions (C) and (C). Beam (x- of 34aJ (34bH34c)
If the intersection with the z plane is within the opposing space of the tongue,
Even after crossing, there is a focusing effect. This focusing effect increases as the amount of deflection in the X direction increases. This has the effect of reducing the directness of deflection in the y direction. Therefore, by adjusting the length of the tongue part @■, it is possible to improve the directness of the deflection in the X direction. The opposing space inside the tongue (c) is as shown in FIG. A pair of tongues of QV (2 kV vs. cando) @
@ and +] 4 kV (Kan-FK pair (, 16 kV)
The second pair of faces C? ! It is surrounded by Jω. and. The mutual distance between the pair of tongues (C) and (B) on the y-axis. On the X axis? The mutual spacing (7) of the pair of surfaces is equal. Therefore, a conceptual quadrupole lens field is formed as shown by 1 equipotential #Gυ. Therefore, the effective utilization area, that is, the pore diameter ratio increases. In this example, the ratio W, /W of the lens effective area W in the y-axis direction and W2 is 0.85. The ratio Wx/W1 of the x-axis direction lens effective area WX and Wl is 0.5
, each of which is significantly larger than a conventional polarizing magnifying lens. Or, for example, change the deflection sensitivity in both y and y directions to CR'1', which has the same overall length as the conventional one,
7 V/cm, which can be as large as 2.3 V/cm in the x direction. Therefore, the total length of CI (T) can be shortened. Embodiment] Next, a deflection magnifying lens (12a) according to a second embodiment of the present invention shown in FIGS. 10 to 13 will be described. However,
In this example and other examples described below, the first
Components that are substantially the same as those in FIGS. The first cylindrical electrode (IFQ) of the deflection magnifying lens (12a) shown in FIG. 10 has substantially the same configuration as that shown in FIGS. 842 and 3, and has the same function. The second cylindrical electrode (a) is shown with the same reference numeral in FIG. It has a pair of tongue-shaped portions 06)0η and is arranged in series with the cylindrical electrode α&. That is, the first cylindrical electrode a& and the second cylindrical electrode α9 are arranged to face each other with a gap interposed therebetween. The second tongue-like portion ■0η is connected to the first cylindrical electrode (1
81 second pair of surfaces t23 (located on the extension plane of 2a, and the second pair of surfaces I23+ (24+ notches) produced by forming the first pair of tongues I251. Therefore, four spaces are created by the first pair of tongues (c) and (a) and the second pair of tongues scxi C37+ as shown in FIG. This deflection magnifying lens (12aJ) is formed symmetrically around the X-Z plane and the y-z plane, and W, , ¥v, , W, and W4 in FIGS. 11 and 12 are set equal, respectively. Therefore, the second pair of tongues I26
The electric field field in the space surrounded by 1 (to) and (b) is the 6th
As shown in the figure, the first quadrupole lens field is ideal.
The same effects as in the embodiment can be obtained. [Third Embodiment] FIGS. 14 and 15 show a deflection magnifying lens (1)b) according to a third embodiment of the present invention. The deflection magnifying lens (1) b) shown here is composed of each cylindrical electrode (181 (In) of each surface CD@
(c) C4 (5) This is a flat surface of Ni-no-kan. Even if the surface is flat like this, if the dimensions of each part are set almost the same as in the first embodiment, the space surrounded by the pair of tongues h and the pair of curls will be close to ideal. A quadrupole lens field can be obtained, and almost the same effects as in the first embodiment can be obtained. [Fourth Embodiment] FIG. 16 shows a deflection magnifying lens (1) according to a fourth embodiment of the present invention.
2c) is shown. This deflection magnifying lens (12c). Each surface of the deflection magnifying lens (12a) in FIG.
, and each surface of the second cylindrical electrode +271 +21 (the (to) of + is a plane. Other A are 10th-0)
Since it is the same as the embodiment, almost the same effect can be obtained. [Fifth Embodiment] The cathode ray tube of the fifth embodiment shown in FIG. !
a) Make the yk cand into a protruding arch shape. Also, the end (27a) on the cand side of the third pair of surfaces @ (to)
<28a) is shaped like an arch concave toward the screen. Even with this configuration, the same effects as in the second embodiment can be obtained. [Modifications] The present invention is not limited to the above-described embodiments. For example, the following variations are possible. (a+ If necessary, the first pair of tongues (251@
The tips IR+ (25c) (26c) may be arched in the direction of the cand. (b+ The quadrupole lens (71+81) shown in Figure 1 can also be applied to a CRT having a configuration in which part or all of Il is omitted. , the configuration may be such that a voltage close to this is applied. (dl In FIG. 2- and FIG.
It is also possible to provide a curvature only in the vicinity of the central portion that intersects the y-2 plane and the X-Z plane, and to make the vicinity of the corners a flat surface. Also, each electrode 0
The angle of &a9 may be rounded. Also. The cross-sectional shape of each surface may be a curve such as a circle, an ellipse, or a parabola. le+ Screen (can also be applied to an accumulation tube targeting 13I. Therefore, the present invention includes 3. The screen shall also include the target.) Tongue (25+ (for 26+ opposing spacing,
First and second cylindrical electrodes (l) 0 (19) with a rectangular cross section that has a sufficiently large distance between the opposing faces of the fourth pair of surfaces (to) are used. The present invention can also be applied to the case of one lens. [Effects of the Invention] As is clear from the above, the present invention provides a deflection magnifying lens that is strong and has a large usable effective diameter with a relatively simple structure. Therefore, C with high sensitivity and short overall length can be used.
RT can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a CRT according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the deflection magnifying lens of the first embodiment. FIG. 3 is a perspective view showing the first cylindrical electrode of FIG. 2. FIG. 4 is a plan view of the deflection magnifying lens shown in FIG. 2. FIG. 5 is a first side view of the deflection magnifying lens shown in FIG. 2. FIG. 6 is a front view of the magnifying lens shown in FIG. 2. FIG. 7 is a sectional view taken along line η-■ of the fourth core. FIG. 8 is a diagram showing the single-double line cross section and beam locus of FIG. 5. FIG. 9 is a diagram showing a cross section taken along line IX-IX in FIG. 4 and a beam locus. No. 109 is a perspective view showing the deflection magnifying lens of the second embodiment. FIG. 11 is a plan view of the deflection magnifying lens shown in FIG. 10. The 12th prisoner is a side view of the deflection magnifying lens shown in Fig. 10. The 13th core is a sectional view taken along the line XOI-Xnl in FIG. FIG. 14 is a perspective view showing a deflection magnifying lens of the third embodiment. The 15th center is a cross-sectional view of the deflection magnifying lens shown in FIG. 14. FIG. 16 is a perspective view showing the deflection magnifying lens of the fourth embodiment. FIG. 17 is a perspective view of the deflection magnifying lens of the fifth embodiment. (I81...first cylindrical 'wL pole, 01...second
Cylindrical electrode, Qυ (company)...first pair of surfaces, (c) 2
41...Second pair of surfaces, ■(A)...Language portion, @kaku...Third pair of surfaces, Q...Fourth pair of surfaces. Agent Norihiro Takano Shida 4 Figure N5 Figure 1 J Z:ja Clear taste Figure 8 Zb Figure 9 Section C-- Drop! ↑! ■− Taste

Claims (11)

[Claims] (1) 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. 2, a screen for impacting the electron beam emitted from the electron gun, and a deflection magnifying electron lens disposed between the deflection means and the screen; The deflection magnifying electron lens consists of first and second cylindrical electrodes (18) and (19) arranged coaxially, and the first and second cylindrical electrodes (18) and (19)
The cylindrical electrode (18) has an x-z plane when the first direction is the y-axis, the second direction is the x-axis, and the traveling direction of the electron beam when not deflected is the z-axis. It has a first pair of surfaces (21) (22) arranged symmetrically about the center and a second pair of surfaces (23) (24) arranged symmetrically about the y-z plane, The second cylindrical electrode (19) has a third pair of surfaces (27) and (28) arranged symmetrically about the x-z plane, and a fourth pair of planes arranged symmetrically about the y-z plane. Opposite side (29) (30)
and the first pair of surfaces (21) (22) and the fourth
A pair of tongues protruding toward the screen or the electron gun are provided on at least one of the pair of surfaces (29) and (30), and the pair of tongues are provided with a pair of tongues extending parallel to the z-axis. an edge, in the tongue, the first pair of surfaces (21) (22);
) The fourth pair of surfaces (29) (30
) are located in the first and second cylindrical electrodes (18
) (19) is arranged, a plate (41) having an aperture (40) is arranged at the screen side end of the second cylindrical electrode (19), Means for applying a voltage equal to or close to the voltage applied to the screen is provided, and the traveling direction of the electron beam swung in the first direction by the first deflection system is directed between the first and second cylindrical electrodes ( 18)(
19) The quadrupole lens constituted by the quadrupole lens produces an effect of inverting and expanding the deflection, and the electron beam deflected in the second direction by the second deflection system is deflected by the quadrupole lens. A cathode ray tube characterized in that the potentials of the first and second cylindrical electrodes (18) and (19) are determined so as to produce an effect of expanding deflection. (2) The pair of tongues are connected to the first pair of surfaces (21) (2).
2) is a pair of tongue-shaped parts (25) and (26) provided so as to protrude toward the screen side, and the second cylindrical electrode (19) is connected to the first cylindrical electrode (1).
8) The cathode ray tube according to claim 1, wherein the cathode ray tube is arranged so as to surround at least one pair of tongues (25, 26) of the cathode ray tube. (3) The first pair of surfaces (21
) (22), a first pair of tongue-shaped portions (25) (26) provided so as to protrude toward the screen, and a fourth pair of tongue-like portions (29) (30) provided to protrude toward the electron gun side. a second pair of tongues (36, 37) provided in such a manner that the second pair of tongues (36, 37) are provided on both sides of a space facing the first pair of tongues (25, 26); Cathode ray tube according to claim 1, characterized in that tongues (36, 37) are arranged. (4) The tongue-shaped portion is arranged on the fourth pair of surfaces (29) (30
) is provided with one tongue-shaped portion (3) protruding toward the electron gun.
6) (37), wherein the first cylindrical electrode (18) is arranged to surround at least the tongue-shaped portions (36) (37) of the fourth pair of surfaces (29) (30). A cathode ray tube according to claim 1, characterized in that: (5) The tongue-shaped portion (2) of the first pair of surfaces (21) and (22)
5) Screen side ends (25c) (26c) of (26)
) protrudes in an arch shape toward the screen, and the screen-side end (23a) of the second pair of surfaces (23, 24)
The cathode ray tube according to claim 2 or 3, wherein (24a) is concave in an arch shape toward the electron gun. (6) The electron gun side ends (36a, 37a) of the tongue-shaped portions (36, 37) of the fourth pair of surfaces protrude in an arch shape toward the electron gun, and the third pair of surfaces ( 27) A cathode ray tube according to claim 4, wherein the ends (27a) and (28a) of the ends (27a) and (28a) on the electron gun side are recessed toward the screen. (7) The aperture has a first pair of sides formed such that the mutual spacing in the y-axis direction is closest at the center and becomes larger toward both sides, and the mutual spacing in the x-axis direction is at the center. Claim 1 or 2 or 3, characterized in that the second pair of sides is formed such that it is widest in the section and narrows as it goes toward both sides. Or the cathode ray tube according to item 4 or 5. (8) The first, second, third and fourth pairs of surfaces (21) (22) (
23) (24) (27) (28) (29) (30) each has an arch-shaped concave portion in the z-axis direction; The cathode ray tube according to item 3 or 4 or 5 or 6 or 7. (9) The first, second, third and fourth pairs of surfaces (21) (22) of the first and second cylindrical electrodes (18) (19)
) (23) (24) (27) (28) (29) (30)
8. The cathode ray tube according to claim 1, wherein each of the cathode ray tubes is a flat surface. (10) A patent claim characterized in that the mutual spacing between the first pair of surfaces (21 and 22) is set smaller than the mutual spacing between the fourth pair of surfaces (29 and 30). The cathode ray tube according to item 2. (11) The tongue-like portions of the first pair of surfaces (21) and (22) (
25) and (26) have a length that is 80% or more of the mutual distance on the y-axis of the pair of tongue-shaped portions (25) and (26), according to claim 1 or 2. cathode ray tube.