DE2036451A1 - Cathode ray tubes with multiple electron guns with electrostatic deflection - Google Patents

Description

PATENT LAWYERS

dpi formerly Dr.D.Thomsen oipung. H. Tiedtke . G. Bühling _2036-5 ι

. W. Weinkauff

Answer requested at night Please reply toi

MUNICH VALLEY

TEL 0811/22 ε »295051

CABLES: THOP / Γ TELEX: FOLQT

FRANKFÜRT {UM., 50 FUCHSHOHL W TEL.M11 / 51 «A

8000 Munich 2 22 Jl) Ii 1970 T 3733 / case 22 Hi * 8 Elect]

2 2 Hi * 8 Electronics

Matsushita Electronics Corporation Osaka j Japan '

Cathode ray tube with multiple electron guns with electrostatic deflection

The invention relates to an electrostatic deflection cathode ray tube having a Number of electron guns is provided.

In the case of an electrostatic deflection cathode ray tube, a first electron gun has heretofore been put into practice and a second in the neck part of a piston so un-

009886/1609

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brought up that their respective axes are inclined with respect to the tube axis and that the electron beams emitted by the two electron guns are accelerated by a high acceleration electrode system which was formed by conductive films which rest on the inner wall surface of the funnel part of the piston, the corresponding tracks on one common phosphor screen surface appear.

In the vertical arrangement of two electron guns, ie one gun is higher and the other gun is lower, however, the Y (vertical) axial sensitivity changes in the vertical direction on the phosphor screen surface, and the Y tracks do not become perpendicular to either extreme -Sides * causing distortion and dimensional errors. Different distortions occur in the horizontal arrangement of the two electron guns. From the- ^:

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his reason, it is generally required by both the executive; i ™ films that make up the post-acceleration electrode system · * with a conductive spiral-shaped part to connect. It has been found, however, that the previously known cathode ray tube can practically no longer be used if the ratio V ₂ / V ₁ between the two voltages V ^ and V ₂ applied to the two conductive films exceeds the value 6 (six) »:

The invention is based on the object that vorr standing to eliminate modest distortion and moreover the

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Increase intensity of the tracks and the observation of

009886/1609

To facilitate high-speed phenomena.

The invention is explained in more detail below with reference to a schematic drawing. Show it:

Fig. 1 is a side sectional view of a known cathode ray tube with electrostatic deflection »

Fig. 2 is a front view of the known cathode ray tube,

Fig. 3 is a side sectional view of an invention » proper cathode ray tube with electrostatic deflection and

Fig. H is a side sectional view in which the essential Parts of the cathode ray tube according to the invention are shown.

In the cathode ray tube shown in FIG
A first electron gun 1 and a second electron gun 2 are housed adjacent to each other at an inclination of G ^ J * ( about 3 °) in the neck portion of a piston 3. On the inner wall surface of the front panel of the bulb 3 is a phosphor screen
attached. On the inner wall surface of the funnel part, first and second conductive films 5 and 6 are applied. A

009886/1609

Post-acceleration electrode system formed by the conductive films 5 and 6 exerts an accelerating effect on the electron beams 7 and 8 emitted from the electron guns 1 and 2, respectively. On the other hand, a convergent electron lens 9 formed by the electrode system exerts a deflecting effect on the electron beams to the stirring axis. The electron beams 7 and 7 strike the common phosphor screen 4 and generate their corresponding tracks thereon. In this case, however, the trace drawn by the first electron gun 1 and the trace drawn by the electron gun 2 appear in areas A and B in Fig. 2, respectively. As can be seen from the drawing, the Y axis sensitivity changes in the vertical direction on the surface of the phosphor screen 4, and the Y tracks do not become perpendicular on both extreme sides. . Such distortion will appear more conspicuous as the ratio ^V 2 ^V 1 ^{between the} voltages V 1 and V 1 applied to the conductive films 5 and 6, respectively, which constitute the post-acceleration electrode system, increases.

When in Fig. Embodiment of the cathode ray tube according to the invention with electrostatic Ab "steering shown in Figure 3 is the mutual inclination angle fJ ° between the first electron gun 1 and the second addition of this lying electron gun 2 is greater than the aforementioned value C \ j ° j is also a mesh electrode 10 placed between the electron guns 1, 2 and the phosphor screen 4. The angle

009886/1609

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can usually be selected in a range of 5-15. An annular body correcting lens properties is arranged obliquely so as to surround the mesh electrode 10 and an inner conductive film 12 rests on the inner wall surface of the funnel part of the piston 3 in such a way that it corresponds to the mesh electrode 10. * A metal support * ';'} layer 13 is bonded to the inner conductive film 12, while a metallic protective cylinder Ik is bonded to the mesh electrode 10 to support it.

In the structure described above, the _{mesh electrode 10 has a voltage V 3} of about 800V to 3,000V, while the inner conductive film 12 has a voltage V _{4 that} is two to ten times greater than the voltage V ₃ , a * h . usually to approximately 1,000V to 25,000V. In addition, a voltage Vg applied to the lens property correcting ring body 11 is appropriately selected. A divergent electron lens, denoted by reference numeral 15 in Figure 3, can then be formed. The electron lens IS exerts a divergent effect on the electron beams 7 and 8, which come respectively from the electron guns 1 and 2, which are arranged at the angle / Q °, whereby the angles of incidence of the corresponding electrons, - which hit the phosphor screen H , are made smaller than those according to FIG.

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the occurrence of geometric raster distortion is reduced, is due to the fact that both electron guns !! 1 and 2 are inclined with respect to the tube axis »

Is "As shown in FIG. H A from an electric" nenkanone emitted electron beam subjected $ by the electrons "lenses a divergent Ablenkwirkimg is" the angle Q ^ ^0, Q ₂ ° and Q ₃ ⁰ gebeugt1 it is possible to carry We - Correct the lens properties and, if necessary, create the following condition through the action of the diffraction of the ground electrode 10:

In this case, the

as a result of the opposite of the electron gun !! positive

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Furthermore, the configuration can - -

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Mesh electrode arranged between a phosphor screen and at least two electron guns which lie next to one another with their axes inclined with respect to the tube axis; a divergent electron lens is formed by the mesh electrode; an inner conductive film and, if necessary, a lens property correcting ring body are provided; the angles of incidence of electron beams emitted by electron guns on the screen are smaller. Thus, the invention provides various effects; the occurrence of the above-mentioned geometric raster distortion can be eliminated, the ratio V ₁₄ ZV ₃ can be selected over ten, the intensity of the track is increased, and the observation of high-speed phenomena is simplified.

Thus, a cathode ray tube of electrostatic deflection with the invention nit provided is arranged in a Masehenelektrode between a phosphorus Schirra and at least two electron guns, which rest with respect to the tube axis inclined axes, side by side, wherein a post-acceleration electrode system to form a divergent electron lens conductive by an inner Film which rests on the inner wall surface of the funnel part of the tube piston, and the mesh electrode is supplied, whereby the disadvantage of any occurrence of geometrical raster distortion due to the arrangement of the electron guns inclined with respect to the tube axis is eliminated.

009886/1609

Claims (1)

, '036451 Claims I 1J cathode ray tube with electrostatic deflection » characterized in that a hook electrode (10) between at least two with their axes opposite the tube axis around .the angle /) / 2 arranged side by side Electron guns (1,2) and a PhosphorsehiraCH) sits and that a post-acceleration electrode system to form a divergent Electron lens through one on the inner wall surface of the Funnel part of the piston of the cathode ray tube applied inner conductive FiImC12) and the mesh electrode is formed 2ν cathode ray tube according to claim 1, characterized in that the angle 3 ° / 2 in a range of 2 »5 ° up to 7.5 °. 3. Cathode ray tube according to claim i, characterized in that the post-acceleration electrode system is a Ring electrode (11) for correcting the properties of the electron lens and that this ring electrode is the mesh electrode 009886/1609 (10) surrounds. 4. Cathode ray tube according to claim 1, characterized in that that the axes of the at least two electron cannons (1,2) intersect each other in front of the phosphor screen (4). INSPECTED 009886/1609