JPS5823148A - Color picture display unit - 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 to which the invention relates] The present invention generally relates to a color image display device, and more particularly, to a multi-beam color picture tube having a low aberration beam focusing lens with a compact deflection yoke to improve beam focusing performance. or to an apparatus for forming a novel self-concentrating display capable of low stored energy operation without compromising high voltage stability.

[Prior art]

When a shadow mask type multi-beam color image display was first used in a color image display, a dynamic concentration correction circuit was used to ensure that the beam was focused at every point of the scanning mask on the display screen. Since then, for example, U.S. Pat. No. 38001'76
A self-focusing display system, such as that described in that patent, was developed to eliminate the need for a dynamic concentration correction circuit. In the system of the above US patent □, the three in-line electron beams have negative horizontal isotropic aberration and positive vertical isotropic aberration so that they are substantially concentrated at all raster points. Pass through a deflection magnetic field.

When the system of the above US patent was first commercialized, the center-to-center distance (S spacing) of adjacent beams at the deflection plane was kept less than about 5.081ff to simplify the concentration conditions; When the interval is made small, a limit is placed on the diameter of the beam positioning aperture provided in the oblong element of the focusing electrode of the electron gun source for the scanned beam. Since the effective diameter of the focusing lens for each beam is determined by the diameter of this aperture, if the apertures are small, the problem of deformation of the beam spot will occur due to spherical aberration associated with the small diameter lens.

However, later it became possible to widen the beam spacing and increase the aperture diameter of the focusing electrode, which reduced the problem of spot deformation but increased the problem of concentration.

For example, in the next improvement of the self-focusing display method described in the paper by Yono et al. [Mini Neck Color Picture Tube] published in the March/April 1980 issue of the Toshiba Review, the outside diameter of the neck was usually used. What came (29, 11 battles and 36.51
111) A significantly smaller (22,5 mtpr) color picture tube is used with a relatively compact tube construction with an additional deflection yoke. According to this paper, reducing the diameter of the neck saves the induced power for horizontal deflection and improves the deflection sensitivity by 20 to 30 degrees compared to a conventional neck diameter of 29 degrees.

The dimensions of the neck region add to the difficulty of obtaining sufficient focusing voltage and high voltage stability (and thus reliability for discharge).

[Disclosure of the invention]

The present invention aims to provide a color image display device using a tube yoke structure in which deflection power saving, deflection sensitivity improvement, and yoke compactness, such as the above-mentioned "mini-neck" method, can be obtained by relying on a reduction in neck diameter. The method of the present invention uses a small S spacing (approximately 5.osxx) like the above-mentioned "mini-neck" method.
In this method, the effective focusing lens diameter is limited to be smaller than the center spacing of adjacent beams incident on the lens, whereas the focusing electrode structure forms an asymmetric main focusing lens whose major axis is three times or more larger than the center spacing of the beams. is used.

Because the neck diameter reduction of the "mini-neck" approach is not employed in this invention, focusing voltage levels comparable to those commonly used in the past can be applied without sacrificing high voltage stability, and the focusing electrode structure There is adequate clearance to maintain a suitable clearance between the inner wall and the inner wall. At this voltage level, significantly higher focusing performance than that obtained with the "mini-neck" approach described above is easily obtained. Also, some of the focusing performance may be sacrificed in order to relax the requirements of the focusing voltage source by operating at a reduced voltage level.

[Embodiment of the Invention] In an embodiment of the invention, the tube yoke structure has a normal neck outer diameter of 29. A llIIIM tube is used. This eliminates the handling problems associated with the fragility of 22.5 mm neck diameters, both in tube manufacture and image display assembly, and also reduces the evacuation time associated with evacuation of "mini-neck" tubes. It also solves long problems.

According to one embodiment of the invention using a 900 deflection angle, S
In a tube with a diameter of 29.1 lffff and a spacing of about 5.0811 rN, the inner diameter of the window of the horizontal deflection winding at the beam exit end is about ac+, 7 mm (i.e., O0'7 per l° of deflection angle).
The stored energy requirement for a compact 90° yoke horizontal deflection winding of semi-troid type (i.e. the vertical deflection winding is Troy) is only 1.85 mJ at an anode voltage of 25 KV operation.

Another embodiment of the invention using a 110° deflection angle provides a tube with a similar S spacing and neck diameter and an inner diameter of about 8.15 mm at the beam exit end of the window (i.e., again with a deflection angle of 1 A compact semi-troid type yoke (less than 0,1611 ff per degree) is provided to provide a self-focusing 19V image display. The stored energy requirement of the horizontal deflection winding of this compact 110° yoke is only 3.5 mJ at an anode voltage of 25 KV operation.

To understand the relative connectivity of the yokes in the embodiments described above, it is important to note that a comparable internal diameter of a 90° deflection yoke used for a long time in the past with the wide S-spacing tubes described above is, for example, about '1B, 2MM. On the other hand, the inner diameter of a 110° deflection yoke used for a long period with a tube with a wide S spacing is, for example, about 108.
All you need to know is that it is significantly larger than 76 fights).

In both of the above-mentioned embodiments, a high level of focusing performance is ensured by inserting a focusing electrode structure having the general shape disclosed in US Pat. In this shape, a part of the main focusing electrode at the beam exit end of the electron gun assembly is perpendicular to the long axis of the tube neck, and three circular holes are formed here through which each electron beam passes separately.

Adjacent portions of the main focusing electrode also extend longitudinally from the portion to form a common enclosure for the entire beam path. The surrounding walls of the main focusing electrode are juxtaposed to form a common focusing lens for the beam therebetween. The inner major axis of the common wall of the last focusing electrode is, for example, 17.65 mm, and the inner major axis of the common co-wall of the next focusing electrode after the last one is, for example, 18 mm.
．． It is 16ff.

With this dimension, the internal space of the neck portion with a diameter of 29.11 mm becomes wider (compared to the above-mentioned 1 mini neck), and a focusing lens whose major axis is at least 3.5 times the center distance of the apertures can be obtained. The required concentration effect on the beam emitted from the electron gun assembly is controlled by the difference between the long spans described above.

In one exemplary form of an electron gun assembly embodying the present invention, the inner periphery of the common surrounding wall of the next focusing electrode at the rearmost position has a racetrack shape, for example, as described in the above-mentioned US patent application. In contrast, the inner periphery of the common surrounding wall of the last focusing electrode has a dumbbell shape, for example, as described in US Patent Application No. 2B2228. Furthermore, there is a lens asymmetry in the beam forming region of the electron gun assembly of the type that reduces the vertical dimension of each beam cross section at the entrance of the main focusing lens relative to its horizontal dimension. This asymmetry is introduced, for example, by cooperating a perpendicularly elongated rectangular opening with each circular hole in the first grid (G1) of the electron gun assembly.

By appropriately selecting the dimensions of the above-mentioned "race track type" and "drink type" surrounding parts and the rectangular opening of Gl, the permissible shape of the light spot at the center and edge of the display raster is related to these elements. This is obtained by optimally balancing astigmatism.

FIG. 1 is a plan view of a picture tube yoke structure of a color image display system embodying the principles of the present invention, in which the color picture tube 11 has a cylindrical neck portion 11N (accommodating an in-line electron gun structure).
, has a vacuum envelope including a substantially rectangular screen section that accommodates a display surface (not shown to increase the size of the drawing) and a funnel section 11F (partially shown) that connects the two. The yoke mounting base of the deflection yoke structure 13 surrounds the adjacent portion of the neck portion 11N and the funnel portion 11F.

The yoke structure 13 includes a yoke mounting base 1'7 (made of insulating material).
It includes a vertical deflection winding 13V wound in a toroidal manner around a magnetic core 15 of magnetizable material surrounding the yoke structure 1, and a horizontal deflection winding 13H'ii which is not visible in FIG.
3, the horizontal deflection winding 13H is wound in a saddle shape, and the effective conductor extending in the longitudinal direction is connected to the yoke mounting base 17.
It is stuck inside the throat of the person.

The front end of the winding 13H is wound up and housed within the front edge 1'7F of the mounting base 17, and the rear end (not visible in FIGS. 1 and 2) is similarly housed within the rear edge of the base 17. It is housed within 1”R.

In FIG. 1, dimensional relationships suitable for one embodiment of the present invention are specified, and the compactness of the deflection yoke formed by the windings 13H and x3V (the deflection angle given by the yoke) is 1 degree. Approximately 0. Front inner diameter equivalent to less than Pro H
i”. As shown in FIG. 2, this inner diameter is measured at the front end of the active conductor of the saddle winding 13H (i.e., at the beam exit end of the window formed by the winding). The outer diameter of the neck portion 11N of the color picture tube 11 is the normal 29.11 mm.
It has become m.

The electrostatic beam focusing lens 18 (indicated by a dotted line lens) formed between the electrodes of the electron gun assembly in the neck part 13 is directed in the horizontal direction (that is, on the horizontal plane occupied by the three beam axes R1G and B). The width rfJ is 3.5 times or more the distance between adjacent beam axes rgJIJ, t, approximately 5.08 fl at the lens entrance.

FIG. 3 is a partially sectional side view of one embodiment of an electron gun assembly suitable for the neck portion 11N of the color picture tube 11 shown in FIG.

The electrodes of the electron gun assembly in FIG. 3 include three cathodes 21 (only one is visible in the side view of FIG. 3).

Control grid (Gl) 23, shielding grid (G2) 25
．． There is a first accelerating and focusing electrode (G3) 2'7 and a second accelerating and focusing electrode (G4) 29. The mounting base for these electron gun elements is provided by a pair of parallel glass columns 33a% 331) between which each electrode is supported.

Each cathode 21Fi()1% is aligned with each aperture in each electrode of G2, G3, and G4 so that electrons emitted from the aperture can reach the display surface of the picture tube. The electrons emitted from the cathode were held at different unidirectional potentials (e.g., O volts and +1100 volts, respectively) ()l
, are formed into three electron beams by each electrostatic beam forming lens set between opposing aperture areas of the G2 electrodes 23, 25. This beam is first focused on the display surface by G
3. Performed by the main electrostatic focusing lens (18 in FIG. 1) formed between the adjacent regions (21a, 29a) of the G4 electrode. For example, the G3 electrode is at the potential applied to the G4 electrode (e.g. +
25KV) 26-chi potential (e.g. +6aoov)
is maintained.

The G3 electrode 27 consists of two cup-shaped elements 2'7a and 2'7b whose open ends with seven flange abut each other, and the front view of the front element 2'7a is shown in FIG. 4, along the line a-- c'
A cross-sectional view along the line E-E' is shown in FIG. 8, a back view of the rear element 2'71) is shown in FIG.
This is shown in Figure O.

The G4 electrode 29 includes a cup-shaped element 29a and an electrostatic shielding cup 291 whose flanged open end and apertured closed end abut each other.
It consists of. A rear view of the element 29a is shown in FIG. 5, and a cross-sectional view taken along the line DD' is shown in FIG.

Three openings 44 are formed in a portion 40 perpendicular to the axis that corresponds to the bottom of the concave portion at the closed front end of the G3 element 27&.

The peripheral wall 42 of the concave portion, which forms a common surrounding wall for the three beams emitted from each of the apertures 44, has semicircular sides on both sides and a parallel straight line between them. Looks like a truck. The maximum horizontal inner diameter of the surrounding wall portion of 03 is on the plane of the beam axis, and is represented by f□ in FIG. Further, the maximum vertical inner diameter of the surrounding wall portion of G3 is determined by the interval between the parallel linear portions of the surrounding wall, and is represented by f2 in FIG. 4. This vertical inner diameter is f2 at any beam position.
be equivalent to.

Three openings 54 are also formed in a portion 50 perpendicular to the axis corresponding to the bottom of the concave portion at the closed rear end of the G4 element 29a.

The peripheral wall 52 of the concave portion forming a common surrounding wall for the three beams incident on the G4 electrode has a parallel straight line shape at the center, but at both ends there is an excess diameter larger than the parallel wall spacing at the center. It has a semicircular shape and looks like a "salmon" as shown in Figure 5. Because of this shape, the vertical inner diameter of the G4 enclosure at the axial position of the central aperture is smaller than that at the axial position of the bilateral apertures. The maximum horizontal inner diameter of the surrounding wall of G4 is in the plane of the beam axis and is indicated by f3 in FIG. Further, the maximum vertical inner diameter of the surrounding wall portion of G4 corresponds to the diameter of the semicircles at both ends, and is indicated by f4 in FIG.

The maximum outer width of each of the G3 and G4 electrodes is the same, and the f6
It is shown in The diameter of the apertures 44.54 is also the same and is indicated by d in FIGS. 8 and 9. The depths of the recesses of the G3 and G4 electrodes are also equal and are indicated by r in FIGS. 8 and 9. However, the depth of the hole in G3 is a)
and that of 04 (G2 in Figure 9) are not equal o d %
f engineering, f2, f3, f4, f5, f6, r1a engineering
For example, the value of FL2 is as follows. d=4.06J
ff.

fl=la+la RM, f2=8.0OII
IIl, f3= 1'7.65 jl'l,
f,=”1.24MIR,f5=6.86M11,f6
−22.22 MW%r = 2.9211111°a,
=0.861111%a2=1.14 fl, and the center spacing g between adjacent apertures of each focusing electrode is, for example, 5.08 ff, as described with respect to FIG. The axial length of each element 2'/a%29a is, for example, 12.451f113.
0.5jnl, the 03.04 spacing of the structure of FIG. 3 is, for example, x, 2'y tz.

The prominent main focusing lens formed between the elements 2ta and 29a has equipotential lines with relatively low curvature in the region that extends continuously between the opposing recessed wall surfaces and intersects the beam path, and has three equipotential lines. It appears as a large single lens that intersects all of the electron beam's path. In contrast, in conventional electron guns without recesses, a significant focusing effect is provided by a strong equipotential m with a relatively high curvature concentrated in each unrecessed aperture region of the focusing electrode. Since the elements 27a-129a of the illustrated embodiment have recesses, the relatively high curvature equipotential lines in the aperture region play only a minor role in determining the quality of the focusing performance;
Rather, it is determined by the dimensions of the large lens in relation to the invaginating wall.

This ensures that the level of undesirable spherical aberration effects is relatively independent of aperture diameter and is dominated primarily by the dimensions of the large lens formed by the recessed wall, resulting in a narrow beam even when limiting the aperture diameter. interval (e.g. 5,0811
1111) can be used.

Under the above conditions, the diameter of the neck is not a limiting factor in focusing performance.If the above-mentioned dimensions are used in the focusing method of the present invention, the diameter of the neck of the above-mentioned normal diameter (i.e., 2g, 11sm) (even at the worst glass tolerance) ) Very good focusing quality can be obtained with external dimensions of the focusing electrode such that it is easily applied with an acceptable spacing to the inner wall of the envelope that is compatible with good high voltage stability.

On the other hand, the neck of the 1-mini neck tube of Yono et al. mentioned above does not fit into the focusing electrode structure of the dimensions mentioned above.

On the convergent side of the main electrostatic beam focusing lens 1B, there is a concave portion of the element having a racetrack type peripheral wall as described above. A horizontal-to-vertical asymmetrical shape such as a star creates an astigmatism effect, resulting in a G
The vertical lines of the electron beam passing through the recesses of the three electrodes converge to a greater extent than the horizontal lines. If the concave portion of the G4 electrode existing alongside this is of the same race track shape, the divergent side of the main focusing lens also exhibits an astigmatism effect in the compensation direction. This compensating effect is inadequately sized to prevent the presence of net astigmatism and may interfere with forming a light spot of the desired shape on the display surface.

One way to make the necessary additions to compensate for this astigmatism is to
As described in the above-mentioned U.S. Patent Application No. 201692, a pair of metal bands are used to form a slot in an opening in a plate perpendicular to the axis on the contact surface of the elements 29a and 29b, and this method Examples of dimensions of each part are given in the US patent application.

Other methods of making the necessary additions to compensate for astigmatism are as described in the aforementioned US patent application Ser. No. 2,822,288.

The shape of the concave portion of the G4 electrode is changed to a "salmon-shaped" shape. For this purpose, the reduction in the vertical dimension of its dumbbell-shaped central region is selected to substantially completely compensate for the astigmatism of the diverging part of the main focusing lens itself, or
Select to replenish the compensation effect of the slot. Examples of the dimensions of each part obtained by this method are also described in that US application.

Here, G
Another astigmatism compensation method is used which combines the compensation effect obtained by introducing a suitable asymmetry in the beam-forming lens formed by the G2 electrodes 23.25.

In order to understand the nature of this compensation effect, it is appropriate to consider the structure of the Gl electrode 23 as shown in the rear view in FIG. 1 and in cross-section in FIGS. 7a and 1b.

There are three holes 64 (diameter d) in the center of the Gl electrode 23.
, which communicate with the recess 66 on the back and the recess 68 on the front of the electrode 23 at each aperture. The shape of the peripheral wall of each of the rear recesses 66 is circular, and its diameter is large enough to receive the front end of the cathode 71 (outline indicated by dotted lines in FIG. 7b) with an appropriate gap. Additionally, the peripheral wall of each front recess 68 is shaped like a rectangular slot whose vertical dimension V is much larger than its horizontal dimension. The center distance g between adjacent openings 64 is the same as that of the 03 and G4 electrodes described above. Examples of other dimensions of the G1 electrode 23 are as follows. d engineering=
0.615 ho, k = 3.0'15 ho, h, : O
, '711 ml, V = 2.134 mW, aperture 6
4 depth G3" 0.102 fin, slot depth a4 = 0.203 mm, depth of recess 66 a5 = 0.4
57 fights. When assembled with the cathode 21 and the G2 electrode 25,
The distance between the cathode 21 and the bottom of the recess 66 is, for example, O, 152f.
flll! For example, the interval between Gl and 02 is 0, 1+78
It's a fin.

In the assembled state shown in FIG. 3, the three circular holes 26 of the G2 electrode 25 are aligned one by one with the apertures 64 of the G1 electrode 23, and the slots 68 therebetween are aligned with the respective converging holes 26 of the G1-G2 beam forming electrodes. Introducing asymmetry on the sides. This moves the intersection of the vertical lines of each beam further along each beam path than the intersection of the horizontal lines, so that the cross-section of each beam entering the main focusing lens has a horizontal dimension larger than its vertical dimension. , the direction of this "pre-deformation" of the beam cross-sectional shape is the direction that compensates for the light point deformation effect of the astigmatism of the main focusing lens.

One of the advantages of "pre-deforming" the beam before it enters the main focusing lens, as described above, is that it promotes equalization of the focusing quality in the vertical and horizontal dimensions. The asymmetry of the main focusing lens is such that the vertical dimension of the lens region that intersects the beam path is significantly larger than the diameter of the focusing electrode aperture (which limited the size of the focusing lens in conventional electron guns discussed above), but the horizontal dimension of that region It is of a nature that it becomes smaller. Each beam's vertical lines therefore see a smaller lens than its horizontal lines see.

The "pre-deformation" described above limits the vertical divergence of each beam as it passes through the main focusing lens, so that the separation of the vertical boundaries of correctly centered beams passing through a small, low quality vertical lens is large and high quality. so that the separation of the horizontal boundaries of the beam passing through the horizontal lens is less than that of the horizontal lens.

Another advantage of "pre-deforming" the beam entering the main focusing lens described above is that the incidence of the beam on the main focusing lens in response to the fringe magnetic field of the toroidal vertical winding 13V generated behind the yoke structure 13 is The problem of vertical flare above and below the rask, which is related to unfavorable vertical shifts of points, is eliminated or reduced. Although efforts are made to magnetically shield the beam from this fringe field, particularly in the low velocity regions of the beam path, as discussed below, subsequent regions of the path are not substantially shielded from the fringe field. Due to the above-mentioned limitations on the vertical spread of each beam while passing through the main focusing lens,
The possibility that a shift of the point of incidence by the fringe magnetic field will push the boundary group out of the relatively aberration-free lens region is reduced.

Another advantage of adding "pre-deformation" to the beam entering the main focusing lens described above is to reduce the adverse effect of the main horizontal deflection magnetic field imparted by the saddle winding 13H to the light spot shape on both sides of the rask. . To produce the necessary self-focusing effect in the yoke structure, the horizontal deflection field is strongly pincushion-shaped over a significant portion of the axial length of the beam deflection region. An unfortunate consequence of this non-uniformity in the horizontal deflection field is that it tends to produce over-focusing of the vertical lines of each beam on both sides of the rask, but with the "pre-deformation" described above, the deflection The vertical dimension of each beam as it passes through the field is sufficiently compressed to reduce overfocusing effects on either side of the rask to within acceptable limits.

Reference is made to US Pat. No. 4,234,814 to explain the "pre-deformation" of the beams mentioned above. In the construction of this patent, a horizontally elongated rectangular slot is provided on the back surface of each circular aperture in aligned communication with each circular aperture of the 02 electrode, thereby introducing an asymmetry in the diverging portion of each beam-forming lens.
The vertical dimension of each beam passing through the main focusing lens is compressed relative to its horizontal dimension. 0 of the above-mentioned electron gun method
It can be seen that the advantage of introducing the above-mentioned asymmetry into one electrode is an improvement in the depth of focus in the vertical direction. The depth of focus obtained is determined by finely changing the focusing voltage (applied to the G3 electrode 27) over an appropriate range using a focusing voltage adjustment potentiometer normally provided in the display system, and adjusting the focusing voltage in the vertical direction. This allows optimization of horizontal focusing without significant disturbance.

As previously discussed, it is desirable to shield the low velocity region of each beam path from the backward fringing magnetic field of the deflection yoke. For this purpose, a cup-shaped magnetic shielding element 31 is fitted into the rear element 2'7b of the G3 electrode 27, and the closed ends of both are abutted and fixed as seen in the structure of FIG. As shown in FIGS. 6 and 10, three in-line holes 28 having circular peripheral walls are formed at the closed end of the cup-shaped element 27b, and at the closed end of the magnetic shielding fitting element 31. Three in-line apertures 32 are similarly formed with circular peripheral walls that align and communicate with apertures 2B when seated in place.

In the structure of FIG. 3, the opening 28 is the opening 26 of the G2 electrode 25.
are aligned with but axially separated. The dimensions of this part of the structure are, for example, as follows. Diameter of opening 26 =
0.615 MM, depth of opening 26 = 0.508
Diameter of hole 28 = 1,524 Depth of MM1 hole 28: 0.254, Diameter of hole 32 = 2.54,
Depth of aperture 32 = 0.254 mm, axial spacing of aligned apertures 26.28 = 0.838 mm, center spacing of each adjacent aperture (
g) -s, oem0 magnetic shielding fitting element 31 mentioned above
For example, the axial length of G3 elements 2'7b and 2'7a is 13.335 ff and 12.45 ff, respectively.
It is f. The length of this shielding element (less than the IA of the total length of the G3 electrode) allows two competing wishes: to shield the beam path in the front focal region and to eliminate the distortion of the magnetic field that disturbs the concentration at the four corners. It shows the compromises you can get. The shielding element 31 is made, for example, of a magnetizable material (for example, an iron-nickel alloy of 52 mm nickel and 48 mm iron) having a higher magnetic permeability than the material of the focusing electrode element (for example stainless steel).

The front element 29b of the G4 electrode 29 has a plurality of contact springs 30 around its front part, so as to contact the conventional carbon coating on the inner surface of the picture tube and transmit an anode potential (for example, 25 KV) to the G4 electrode. It has become. The closed end of the cup-shaped element 29b has three in-line apertures (with a center spacing of e.g. 5,08 ff1l+) through which each beam leaving the main focusing lens passes.
(not shown), and preferably a high permeability magnetic member for correcting coma aberration, as disclosed in US Pat. No. 3'/'72,554, is attached near the opening on the inner surface of the closed end.

The other electrodes (cathode, Gl, 'G2,
Application of the operating potential to G3) takes place from the base of the picture tube via a conventional conductor structure (not shown).

The main focusing lens formed between the 03 and G4 electrodes of the structure of Figure 3 has a net focusing effect on the three beams passing through it, so that the beams exit this lens with a tendency to concentrate, but element 2 The relative values of the horizontal dimensions of adjacent enclosures '7a, 29a influence the strength of this concentration effect. That is, this concentration effect increases as the size ratio approaches the width of the enclosure wall of 04, and decreases as the size ratio approaches the width of the enclosure wall of G3. In the embodiment whose dimensions are illustrated above, a reduction in concentration effect is desired, and the ratio of the wall widths of GfS and G4 is 17
It was found that 15/695 was appropriate.

When using the display system of FIG. 1, a conventional neck encircling device may be used to optimally adjust the concentration of the beam at the center of the raster. This device may be of the adjustable magnetic ring type as described in US Pat. No. 3'725831 or of the sheath type as described in US Pat. No. 41624'70, for example.

13 is a schematic illustration of a variation of the electron gun assembly of FIG. 3 that may be used in the apparatus of FIG. 1; FIG. In this variant, the shielding grid 25
A pair of auxiliary focusing electrodes 2' and 29' are provided between the main acceleration and focusing electrodes 27/ and 29/.

The main focusing lens is formed between the final electrodes, which in this case constitute the G5 and G6 electrodes. The auxiliary focusing electrode (G3 electrode 27/') through which the beam passes first is energized with the same potential as the G5 electrode 2 (e.g. +8 KV), but the other auxiliary focusing electrode (G4 electrode 29") energized at the same level (e.g. 25 KV) as the G6 electrode 29. As in the embodiment of FIG. Each beam forming lens forms a respective beam (from the electrons emitted from each cathode 21/).

To realize this second embodiment, the G5 and G6 electrodes 2 and 29 are shaped similarly to, for example, the 03 and G4 electrodes 2 and 29 of the structure shown in FIG. A surrounding wall having the above-mentioned dimensional order of "marine" and having recessed apertures with the above-mentioned center-to-center spacing of 5808 mm is juxtaposed at the bottom.

A "pre-deformation" of the beam of the type described above is also introduced by the asymmetry of each beam-forming lens. This is for example 01%
G2 electrode ""s 25"fr Said US Patent No. 4234
No. 814, a horizontal rectangular slot is provided on the back surface of the Gl electrode 23', and this is used as the GA.

It is interposed between three circular holes of G2 with a center spacing of 5.08H. For example, the interposed auxiliary focusing lenses 27", 29" formed by cup-shaped elements having three in-line circular holes with center spacing as described above are used to control the beam passing through the main focusing lens and the next deflection area. We introduce symmetrical G3-G4 and Ga-G5 lenses with the net effect of a symmetrical reduction in cross-sectional dimension. Although this size reduction may be desirable to reduce the overfocusing effect of the horizontal deflection field on the light spot shapes on both sides of the raster, the simpler two-potential focusing scheme shown in Figure 3 has a masking effect in the mu path region of 03. This is achieved by forming the electrode 27'' from a high magnetic permeability material.

In order to increase the sensitivity of the deflection yoke of the method shown in Fig. 1, the shape of the conical part of the deflection area of the funnel part 11F of the tube envelope is changed so that the effective conductor of the deflection winding 13H of the compact yoke is used to create the neck shadow (deflected beam). impact on the inner surface of the funnel)
It is preferable to choose the outermost beam path (toward the four corners of the raster) as close as possible (towards the four corners of the raster) while eliminating the The selected funnel shape is shown below.The formula representing this shape is as follows.

x =, C0-4-C1(Z)-4-c2(z2)+a
s(z")+ca(z')+05(Z5)+06(Z6
)+07(Z') where X is the radius of the cone measured from the longitudinal axis A of the tube toward the outer surface of the envelope, and 2 is the radius 1 in front of the joining line between the neck and funnel. ,2'7
It is the value expressed in fins of the distance measured in the direction of the display surface along the axis A from the plane 2 = 0 that intersects the axis A at the point ff111, in this case GO = 15.10490590, (!l
= -0,1582240210%C2=0.011
62553080, C3=8.880522990
X 10 , c4=-3,877228960X
10,C! 5 = '7.249226520 X1
0, C6: -6,'723851420 X
10, C) = 2.487i! 7761+
x lo lx, and this value is 9.35~52°0
Valid for a z value of 11nR.

FIG. 12 shows a funnel shape selected to be suitable for one embodiment of the system of FIG. 1 using a 110 DEG deflection angle.

The formula representing this shape is as follows.

X = C! O+C! 1(Z)+c! 2(Z2)+03
(Z3) + (34 (Z') + C3 (Z5) where X is the measuring tube 7'c cone radius tal from the longitudinal axis A to the outer surface of the envelope
The value expressed by l, 2 is the distance measured along axis A in the direction of the display surface from the plane 2 = 0 that intersects axis A at a point 1.4'7ff in front of the joining line of the neck part and funnel part. In this case, Co =14,5840702°C1=
0.312534174, 02=0.02
4218ri585, C3=-6,99'740898
XIO',C! 4= 1.64032142X 10
%05 == 1.17802606 X 10″
This value is valid for two values of 1.53 to 50 and Ofl.

For example, in the 1100 deflection angle 19 type embodiment of the method shown in FIG.
Envelope part 11F between 17, winding +5 on the outer surface of IIN
The active conductors of 1iIx3H are brought into close abutment. With the funnel shape of FIG. 12, the yoke of length y-y' can be retracted, for example, by 5-6n (for purity control) without the beam impinging on the corners of the envelope.

2o In Fig. 14a, the general form of the necessary non-uniformity function H2 of the horizontal deflection magnetic field required for the yoke of Fig. 2 to achieve self-focusing in the 110' deflection embodiment of the method shown in Fig. 1 is shown by the solid line HH2. has been done. Here, the horizontal axis indicates the position along the longitudinal axis of the tube (the position of the plane z=0 in FIG. 12 is shown for reference), and the vertical axis indicates the degree of deviation from the uniform magnetic field. In Fig. 14a, the upward displacement (in the direction of arrow P) of the curve HH2 from the 0 axis indicates a "pincushion" non-uniformity of the magnetic field, and the downward displacement (in the direction of arrow B) indicates a "barrel-shaped" non-uniformity. show.

A dotted curve HHo drawn with respect to the horizontal axis at the same position shows the H8 function of the horizontal deflection magnetic field representing the relative magnetic field strength distribution along the tube axis. The positive wave of curve HH2 indicates the location of the strong pincushion field region mentioned above as the cause of the spot shape problem on both sides of the raster.

In Figure 14b, the horizontal and vertical axes are the same as in Figure 1aa.
The general form of the necessary inhomogeneity function H2 of the vertical deflection magnetic field to obtain a self-concentration result for the horizontal deflection magnetic field of FIG. 1 is shown.

The accompanying dotted curve ■Ho shows the H8 function of the vertical deflection magnetic field, and represents the relative magnetic field strength differential distribution along the tube axis. The left end of the curve VH6 demonstrates the significant outflow of the vertical deflection field to the rear of the toroidal winding 13V, as discussed above regarding the benefits of "pre-deformation" of the beam.

For example, based on the shape of FIG. 12 and suggested by the curve of FIG. 14b, the main deflection effect of the system of FIG. Occurs in areas where it is possible.

Therefore, it can be seen that the absence of a reduction in the neck diameter relied on in the [-mini-neck] method is not so important in achieving deflection efficiency. On the other hand, since there is no reduction in this diameter, it is easy to obtain a focusing lens diameter that cannot be achieved with the "mini-neck" method.
High focusing quality is guaranteed consistent with high voltage stability performance.

In FIG. 12, the plane C%C' perpendicular to the axis represents the positions of the front and rear ends of the magnetic core 15 in the 1100 deflection type 19 embodiment of the system shown in FIG. As shown in the figure, the axial distance (y-y'
) is significantly larger (e.g. 1.4 times) than the axial distance (C-C') between the front and rear ends of the magnetic core 15, and is greater than l/a (e.g. 62.5%) of the extra conductor length behind the magnetic core 15. There is.

Distance between each plane (c-y), (y-y, (y'-c')
) H e.g. about 7.62fl, 50.81N1% respectively
It is 12.7n.

The feature of significantly extending the effective conductor of the horizontal winding behind the magnetic core is the storage energy of the system (i.e., 1/2
'IHLH') and facilitates moving the horizontal center of deflection rearward to substantially coincide with the vertical center of deflection. This restriction of the backward travel of the horizontal windings reduces the demand on the yoke under the required yoke retraction conditions. The relative position and axial distance ratio of the winding 13H and the magnetic core 15 in FIG. 14a and 14b, indicating an acceptable compromise between the competing demands created by the desire for acceptable concentration performance and a suitable yoke retraction range.
Figure volume! It is desirable that the relative positions of the magnetic core unit 131 and the magnetic core unit 5 substantially coincide with the axial positions of the peaks of the respective intensity distribution functions HHO and VHo.

[Brief explanation of the drawing]

1 is a plan view of a combination of a picture tube and a yoke according to one embodiment of the present invention, FIG. 2 is a front view of the yoke structure of the apparatus shown in FIG. 1, and FIG. 3 is a view of the picture tube of the apparatus shown in FIG. Partial cross-sectional side views of the electron gun assembly used in the neck part, FIGS. 4, 5, and 6
1 and 1 are end views of each element of the electron gun assembly in FIG. 3, FIG. Gun element line B-B'
8 is a cross-sectional view taken along line C-C of the electron gun element in FIG.
! 9 is a cross-sectional view taken along line D of the electron gun element in FIG.
1O is a sectional view along line B-D' of the electron gun element of FIG. 6; FIG. 11 is a picture tube suitable for an embodiment of the invention using a 90' deflection angle. FIG. 12 is a diagram showing a picture tube funnel shape suitable for an embodiment of the present invention using a deflection angle of 110°;
FIG. 13 is a schematic diagram showing a modification of the electron gun structure in FIG.
4a and 14b are diagrams illustrating non-uniformity functions that may preferably be associated with one embodiment of the yoke structure of FIG. 2. 11N... Neck part, IIF... Reannel yoke, 13... Yoke structure, 13H... Horizontal deflection winding,
13v... Vertical deflection winding, 18... Main focusing lens, 27.29... Main focusing electrode, 2'7a, 29a
... juxtaposed parts, 40.50... parts arranged perpendicular to the longitudinal axis, 42.52... adjacent parts,
44.54...Inline hole opening. Percentage Applicant R Cini Corporation Agent Tetsu Shimizu and 2 others 2 flashes 3rd mouth 4th closing 51st 6th off diagram o'fafa 8th diagram uv. Procedural Amendment (Spontaneous) September 6, 1980 `` Commissioner of the Japan Patent Office Kazuo Wakasugi1, Indication of Case Patent Application No. 119660/1982, Title of Invention Color Image Display Device 3, Person Making Amendment Case and Relationship Patent applicant address New York, United States 1002
05. The "Claims" and "Detailed Description of the Invention" columns of the specification to be amended. 6. Contents of amendment (1) The scope of claims is amended as shown in the attached sheet. (2) "Horizontal isotropic aberration and positive vertical isotropic aberration" on page 3, lines 19-20 of the specification is corrected to "horizontal axial aberration and positive vertical axial aberration." (3) "Less than" in line 4 of page 4 of the above is corrected to "less than". (4) Delete "guidance to" on page 5, line 4 of the same. (5) Same as above, page 7, “I” in the first line “s, oa,,”
Correct it to "less than 5.081111." (6) “8.15” on page 7, line 12 of the same as “al”
, correct it as J. (7) In the 1st line of page 8 of the same page, change “to that” to “
"Ashi, that again," he corrected. (8) In the same page, page 11, line 17, ``5.08+o+'' is corrected to ``15.08 period)''. (9) Correct "inner diameter" in line 10 of page 14 as above to "inner diameter f5". Attached documents Claims Claims (1) A vacuum envelope including a screen portion for housing a display screen, a cylindrical neck portion, and a funnel portion connecting the screen portion and the neck portion, and a vacuum envelope installed in the neck portion. a display raster surrounding three in-line military abutments to substantially concentrate the beam over the entire screen, with a predetermined deflection angle between the beam paths terminating at opposite diagonal corners of the raster; The device generates a deflection magnetic field to set the beam, and includes a saddle-shaped horizontal deflection winding and a toroid-shaped vertical deflection winding, each forming a window. and a compact deflection yoke structure for setting the deflection center. a portion having three in-line apertures through which each of the main beams passes, and an adjacent portion extending longitudinally therefrom to form a common enclosure in the path of all said beams, said juxtaposed and said three in-line apertures; The distance between the centers of adjacent ones of the apertures is approximately 5.0 Btr in a plane perpendicular to the axis through the deflection center.
an (200 mm) or less, and the shapes of the juxtaposed portions are such that the major axis perpendicular to the axis of the main focusing lens is set to be larger than three times the center-to-center distance between the adjacent apertures,
A color image display device characterized in that the diameter of the neck portion is sufficiently large so that the inner surface thereof is separated from the outer surface of the juxtaposed surrounding walls, and the compact yoke structure is formed.

Claims (1)

[Claims] (1) A vacuum envelope including a screen portion that accommodates a display screen, a cylindrical neck portion, and a funnel portion that connects the screen portion and the neck portion, and a vacuum envelope that is installed within the neck portion and emits three in-line electron beams. a beam path that surrounds the electron gun assembly and adjacent portions of the neck and funnel to draw a display raster while substantially concentrating the beam over the entire screen, terminating at both ends of the diagonal of the raster; The device generates a deflection magnetic field that sets a predetermined deflection angle between the enclosure areas of the envelope, and includes a saddle-shaped horizontal deflection winding and a toroid-shaped vertical deflection winding, each forming a window. and a compact deflection yoke structure for setting each deflection center of the beam within the electron gun structure. a section having three in-line apertures, each perpendicular to the longitudinal axis of the neck, through which each of the three beams passes, and an enclosure extending longitudinally therefrom and common to the path of all of the beams; and adjacent portions of each electrode are juxtaposed to form a common main focusing lens between which the beam departs in a converging manner. The center-to-center spacing of each of the three apertures is such that the center-to-center spacing of adjacent ones of the beams is less than about 5.0 Bfl (200 mils) in a plane perpendicular to the transverse axis through the deflection center. The shapes of the juxtaposed portions are such that the major axis perpendicular to the axis relative to the main focusing lens is significantly larger than three times the center-to-center distance between the adjacent apertures, and the diameter of the neck portion is The inner diameter of the compact yoke structure is sufficiently large so that its inner surface is spaced from the outer surface of the juxtaposed enclosure, and the inner diameter of the compact yoke structure is less than about 0.76 mtt (so mils) per centimeter of the deflection angle at the beam exit of the window. A color image display device characterized in that: