DE1918877B2 - COLOR IMAGE PLAYBACK EARS - Google Patents

Description

The invention is based on the object of lying in a plane which is essentially perpendicular to the axis

Color picture tube of the type described at the beginning of the length of the electron gun. The ray-generating

took to ensure that the surfaces described above are arranged along a straight line so that

Compensate for convergence errors. the rays emitted by them Br, Bg and ob in

The object is achieved according to the invention in that 5 a substantially horizontal or sonsiwie ge

that due to the influence of the magnetic field of the magnet common, the axis of the electron gun

Jochanorüaung on the first pair of plates protruding plane, the Mitteilstrahl Ba

called convergence errors are corrected by coinciding with this axis. A first grid G ₁

that the distance between adjacent ones is at a distance from the beam generating surfaces of the

Plates of the first and the second pair of plates below io cathodes Kr, Kg and Kb and has openings g _x n,

is chosen differently and / or that the two plates g _x a and g _lB , which are in alignment with the grid in the grid. Trains-

of the second pair of plates have a different length of the cathode beam generating surfaces,

to have. In a usual grid G ₂ , which is spaced apart by

The first alternative ensures that the first grid G _{1 is} arranged, there are openings

electric field between the two next to each n i ₅ g, "g-ic and g. _lB provided with the associated

mutually lying plates of the two plate pairs, openings of the grid G _{1 are} aligned. In the axial direction

is of different strength, whereby the two are separated from the usual grid G, tubular

_{grids or electrodes C 3} or G ₄ or G ₅ that emerge diverging from the focusing lens

See the bundle of rays correspondingly deflected at a lower rate, with the cathodes Kr, Kg and Kb, the

will. ₃₀ grids G ₁ and G ₂ and the electrodes G ₃ , G ₄ and G ₅

The second alternative ensures that those in the arrangement shown are not shown with

mounts made of insulating material are mounted diverging from the focusing lens.

Beam bundles an electric field of different lengths For the operation of the electron gun nacb

must go through, whereby their distraction also- F i g. 1 are the grids G ₁ and G ₂ and the

if is different. _a5 electrodes G ₃ , G ₄ and G ₅ matching voltages

With one and / or both alternatives of the invention. So z. B. the grid G ₁ a voltage

According to the solution it is possible to use the three between 0 and -400 V, the grid G ₂ 0 to 500 V,

Beam bundle despite the undesired deflection of the electrode G ₃ and the electrode G ₆ a voltage

middle beam in the plane of the beam between 13 and 20 kV and the electrode G ₄ a

Bring selector to convergence. ₃₀ voltage from 0 to 400 V, with all voltages on

The solution according to the invention even makes it possible to use the cathode voltage as a reference variable

to design a color picture tube so that the converters are. Accordingly, the stress distributions

genz deflection device and the Magnetjochanord- between the respective electrodes and cathodes

tion over each other in the direction of the tube axis and their lengths and diameters essentially

rag. As a result, the color according to the invention can be the same as for a single-potential single-jet

Bild-Viedergaberöhre especially short built are electron gun, which consists of a single cathode and

the. a first and a second grid with a single

In the following, the invention is based on gene opening.

Embodiments explained in more detail. With the voltage distribution given above,

F i g. 1 is a schematic section in a 40 there is an electron lens field between the grid G ₂

horizontal plane passing through the axis of a with and the electrode G ₃ and forms a dashed a

a single electron gun equipped multi-drawn auxiliary lens L ', and around the axis of

ray-color picture tube runs; Electrode G ₄ is made up of electrodes G ₃ , G ₄ and G ₅

F i g. 2 is a partial section made through the same plane an electron lens field, which has a main

As shown in FIG. 1, in which the structure of a part 45 forms a converging lens L , which is also shown in dashed lines.

such a Rönre is shown, the piston neck is drawn. In a typical application of a

length should be reduced; Electron gun A are biases from

F 1 g. 3 depicts a cross section along line 3-3, 100V, 0V, 300V, 20kV, and 200V, respectively

in Fig. 2 represents; or 20 V to the cathodes / Oj or Ka or K _n

F i g. 4 and 5 are partial sections showing the assembly 50 and the first grid G _x and the second grid G _{2, respectively}

of the convergence baffles in a tube according to or the electrodes G ₃ and G ₄ b ^ w. G ₅ laid.

F i g. 2 and 3 represent and two execution To the electron gun according to Fig.! belong

Forms of the invention for eliminating convergence further auxiliary devices F for converging from

show errors. directing electron beams; these facilities

1 shows a multi-beam color picture tube (10) equipped with a single electron 55 comprising a first pair of shielding plates P and P ', cannon, which is shown at a distance on both sides of the axis of the electrons in which the principles of the invention are applied, and sin second pair can be in; the tube has a (not shown - axial direction extending deflection plates Q and Q ', neten) glass bulb as a neck part and one of which, as can be seen from the drawing, the neck part to the fluorescent screen S extending cone part 60 shield plates P and P' on their outsides opposite one another; on the luminescent screen 5 are the UbIi- protrude. In the drawing, these plates are straight arrangements of color phosphors Sr, Sg and linear, but the deflection plates Q Sb as well as a radiation separating pinhole and Q ', as known per se, can also be arranged in a slightly curved manner or shadow mask Gp. Inside or outwards be curved.
The neck portion is the single electron 65 The shielding plates P and P 'are the same loaded cannon A to the cathodes Kr, Kg, and Kb, which are each arranged and similar, so that the average is formed from a beam generation source whose electron beam Be substantially undeflected between As can be seen, jet generating surfaces in one of the shielding plates P and P ' passes through; the

Deflection plates β and Q ', on the other hand, are negatively charged to the plates P on a flange 11 at the adjacent end of one and P' opposite, so that the respective tube extensions of the electrode G ₅ sit, the electron beams Bb and Br affected in turn are converted into the tube neck N through Insulating washers 24 and 25 are yawingly deflected, as is supported in the drawing, between which getter rings 22 and 23 are attached to the corresponding locations in the area between the 5 at a suitable location. The front panels P and Q and P ' and Q' respectively are indicated. In the ends of the plates P and P 'are at their sides by individual can to the two shielding plates P and between them running Klammerelcmente 21 comparable P', a voltage Vo to be set corresponding to the to the inhibited. The voltage VP is equal to the voltage applied to the plates P and P ' electrode G ₅ , and one supplied by a contact spring 18, which is from a voltage Vq, which is about 200 to 300 V lower io of the clamp elements 21 to a conductive layer 17 as Vp, can lead to the associated baffles Q , which are placed on the inside of the cone part C des and Q ' ; so that the shielding tube piston is attached and is at the same potential in the adjacent plates P and P ' , and runs between the bare neck part. The voltage Vp arrives at the plates P ' and Q' and the plates P and Q. The layer 17 is deflected or convergent voltages via an anode (not shown), and the 15 button in the cone part C and on the electrode G, deflection - Or convergence voltage VC generates electrical fields from the plates P and P ' via the elbows 12, which provide the necessary deflection for and 13. From the electrode G ₅ , the voltage can bring about the convergence of Bb and Bn. Vp by means of a conductor, not shown, to the elec-

When the tube is in operation, the electron electrodes G _{3 are} transferred. The layer 17 brings rays B _n , B ₀ and Bb, which also emanate the voltage V _P as anode voltage on the surfaces Kr, K ₀ and K _{B of} the cathode from the beam ends, the shadow mask G _P.

through the associated grid openings ^ _{1 R} , g _lG and pins 14 extend from the plates P and P '

g, B and are light-controlled with red, green and outward and carry at their outer ends glass-blue light control signals that are held between the cathedrals 15 by which the plates Q and Q ' and the and the first grid Gj are supplied. The 35 'are isolated, respective electron beams then pass through the the voltage Vq is represented by a conductor 20 of common auxiliary lens L' at the same time against the plates P and P and overlap in one button 19 in gybed *! / V emanates from the plate at the center of the main lens L, from where they are transmitted as rays and the distance from which continues through a conductor 16 which diverges between the plates Q Br and Bb in relation to the beam B ₀ and runs Q '. The middle electron beam B ₀ holds plates P and P ' on the plate 3'. then runs practically undeflected between the ab- To the neck part N of the tubular piston as possible

shield plates P and P ' further, because keeping these two short is the convergence deflector plates have the same potential. The one located between the F close to the main deflection yoke D ; The electron beam Bb, which passes through the plates P ' and Q' , and both devices, like ir as well as the electron beam Bb passing through between the plates P and Q , can even meet one another. 2, overlap in the axial direction Br electron beam to be removed to the convergence However, when the convergence deflector F ir deflected due to the existing between these plates this manner is disposed, it is within de; Convergence deflection voltage, and that shown in FIG. 1 magnetic field, the vertical field line of which is shown, should be designed in such a way that those generated by the main deflection yoke D , so that electron beams Bb-Bg and Bh, if desired, 4 ° the rays converge horizontally across the screen or at a common point can feel. The plate P, the bracket intersect, which lies in an opening of the shadow mask Gp elements 21, plate ', angle parts 12, 13 and which diverge from there and _{fall onto the respective electrode G 5} together forming a closed color phosphor of a fluorescent screen arrangement 5. The colored fluorescent screen S consists of a large magnetic field of the yoke D allow a current to flow in the number of groups of vertically running red and green circles; the induced current generates and blue fluorescent strips or spots Sr, Sg and in turn a magnetic field between the plates P unc Sb, each group of color phosphors being a color P ' which represents a picture element on the central beam Bg in one direction. The common convergence effect, which corresponds to the horizontal scanning movement dei point of the rays, is opposite to one of the resulting 5 ° rays. As on the other NEN color picture elements. Rays Br and Bb that from the induced current

The electron beam scanning of the surface of the resulting magnetic field between the plates P and fluorescent screen is effected by horizontal and P 'has no influence, suffers during a horizontal vertical deflection yokes D , the horizontal and valley scanning movement at every moment de; receive vertical sweep signals, creating a color point at which the beam B _{G forms} the shadow mask Gj on the color screen. Since with this up, there is a delay compared to the point up construction of each electron beam for focusing through the shadow mask, at which the two beams Bi, the center of the main lens L of the electron gun ^ and B _B converge; this results in defective! are guided by the convergence of the rays.

on the luminescent screen 5 resulting beam spots 60. This defective convergence is practically free of coma and / or astigmatism according to the invention avoided or corrected that di <errors of the main lens, resulting in a better color convergence deflection plates Q and Q ' different! image resolution is achievable. Geometric position compared to the assigned Ab

In the F i g. 2 and 3 is a possibility for the screen panels P and P ' obtained so that the electrical assembly of the in F i g. 1 shows schematically drawn fields between the plates P and Q and the tube shown; The plates P and P ' can have plates P' and Q 'with different deflecting effects, and then the beams Bb b? w _{at their closest to the electrode G 5.} Exercise B _R , whereby the beam ends are held by elbows 12 and 13, len reaches the shadow mask in the same point

can like the ray Bc. despite the fact that the beams Br and Bn are not exposed during the horizontal scan to the magnetic field which acts on the central beam Bc between i> n plates P and P '.

4 shows how the different geometrical relationships between the plates Q, Q ' and the plates P, P' can be expressed by the distances that the plates Q and P or Q ' and P' have from one another. According to FIG. 4, the distance d between the plates P and Q is greater than the distance d ' between the plates P' and Q ', it follows that the strength of the electric field between the plates P' and Q ' and therefore that on the beam Br acting deflecting force is greater than the field strength between the plates P and Q and thus the strength of the deflecting force acting on the beam Bb. The convergence deflection of the beam Br will therefore be greater than the convergence deflection of the beam Bb, so that the beams Br and Bb converge together with the beam Ba at a common point of the shadow mask.

F i g. 5 shows that the geometrically different relationships mentioned on the plates Q. Q ' and P, P' can also relate to the lengths over which the plates P. P ' and Q. Q' extend. According to FIG. 5, the plate Q has a length / in the direction of the tube axis. which is less than the corresponding length extension / 'of the plate Q'. Correspondingly , the beam Bn runs a longer distance within the electric field between the plates P and Q

ίο as the beam Br when this penetrates the electric field between the plates P ' and Q'. Again, therefore, the convergence deflection of the beam B _{n is} greater than the convergence deflection of the beam B _fi , so that precise convergence of the three beams Br, Bg and Bb is reached at a common point on the shadow mask.

Of course, the measures according to the invention, which are individually shown in FIGS. 4 and 5 are shown, can be combined, for. B. the plate Q in

»0 can be placed at a greater distance from the plate P than the plate Q 'has from the plate P' , and the plate Q can be kept shorter than the plate Q '.

1 sheet of drawings

209 508 /

Claims (2)

i 918 ι patent claims- The invention relates to a color image reproduction H 'tube with an electron gun, which at least 1. Color picture display tube with an electric three beam generated, with a screen that nenkanon, which has at least three beams with a variety of color phosphor combinations generated, with a screen that is occupied with a lot 5, with one arranged in front of the screen number of color phosphor combinations occupied color selector, which with a variety is, with a arranged in front of the screen of the individual color phosphor combinations to color selection device, which is provided with a multi-ordered passage opening for the number of bundles of rays from the individual color phosphor combinations, with one between the color selection associated passage openings for the io device and the electron gun Beam bundle is provided, with one between the electrostatic focusing lens, through which all Color selection device and the electron beam are passed through, one of the Gun arranged electrostatic focusing beam along the axis of the focusing lens lens through which all the bundles of rays pass and the other bundles of rays that run along the are guided, with one of the beam bundles running along the axis in a common runs along the axis of the focusing lens and the points in the lens field of the focusing lens cross the other Beams that art along the axis that the other beams of the focusing lens running ray bundles in a common diverging leave, with one between the fo point cross in the lens field of the focusing lens, kussierlense and the color selection device indicated, that the other bundles of rays the »o arranged convergence deflector, which The focusing lens is left diverging, with a first and a second pair of plates, between the focusing lens and the coloring, the two plates of the first pair of plates with Selector arranged convergence a mutual distance on opposite one another Deflection device, which are arranged from a first side of the focusing lens axis, see above and a second pair of plates, the as being that the bundle of rays running along the axis two plates of the first pair of plates with one between the two plates of the first pair of plates mutual spacing on opposite passes, the two plates of the second Sides of the focusing lens axis are arranged, plate pair with a mutual distance that so that the beam running along the aisle is greater than the distance between the two plates of the bundle between the two plates of the first 30 pair of plates, also on opposite sides Plate pair passes through, wherein the two sides of the focusing lens axis are arranged, and Plates of the second pair of plates with one opposite one on each of the focussing lens axis Distance which is greater than the distance to the facing side of a corresponding plate of the first of the two plates of the first pair of plates, flat plate pair, such that between two if on opposite sides of the focussing plates of the two plate lens axes lying next to one another are arranged, in each case on pairs one diverging from the focusing lens from the the side facing away from the focussing lens axis passes through, the two a corresponding plate of the first plate of the first plate pair electrically to one another pair, in such a way that each connected between two adjacent and applied with a first voltage lying plates of the two plate pairs 40 and wherein the two plates of the second plate diverging from the focusing lens exit pair electrically connected to each other and with a of the beam passes, the two second voltages differing from the first Plates of the first pair of plates are electrically energized, and with one next to the connected to each other and arranged with a first voltage convergence deflector are acted upon and the two plates of the 45 sit second to the tube neck of the color picture display tube Pair of plates electrically connected to one another by the magnet yoke arrangement for deflecting the beam bundles and with a second, from the first bundle. Voltage different voltage applied. Such a color picture display tube is and with a device next to the convergence deflection (earlier patent application P 16 3 ") 464.2) arranged, hit on the tube neck 50. If the convergence deflection plates are located far away from the magnetic fields of the main deflection yoke, characterized by the fact that the convergence deflection plates are far away from the main deflection yoke, the neck portion of the tube piston becomes undesirable for the influence of the magnetic field of the magnetic yoke long and therefore requires a greater housing depth of the arrangement (D) on the first pair of plates (P, P ') 55 television receiver in order to accommodate the tube to correct convergence errors caused thereby. If, on the other hand, the neck part of the tube is yawed that the distance between the adjacent ones is shortened, with the result that the converging plates (P, Q; P ', Q') of the first deflector plates in the vicinity of the magnetic yoke arrangement and the second pair of plates come to lie differently, a magnetic field that is selected and / or that the two plates (Q, Q) 60 magnet yoke arrangement induces a current flow in the second pair of plates a different closed conductor circuit, which is of the length at their ends (/, /') to have. interconnected first plates is formed, 2. Color picture display tube according to claim 1, between which the central beam passes. This is characterized in that the convergence current flow in turn generates a magnetic field, the deflection device (F) and the Magnetjochanord '65 especially the projection (D) running along the lens axis in the direction of the tube axis deflects beam bundles so that an exact convergence overlap . with the other two bundles of rays does not come about comes.