JPS58169849A - Color picture tube - Google Patents

Abstract

PURPOSE:To eliminate the color shifting and color fringing of a picture image in random direction, by making the magnetic field quite uniform in the beam pass region when a color picture tube is arranged to East or West thereby reducing the beam landing sufficiently. CONSTITUTION:A magnetic shield has an electron beam pass opening 55 opened to the neck side of a color picture tube where said opening 15 is formed of a triangular notch 16 made in the short side wall and a long side while openings 17 and 18 extending in Z-direction are made in the long side wall symmetrically against y and z axis. Said opening 17 is an acute triangle having a bottom at the screen side. While the opening 18 is a slit having uniform width extending in the direction of a funnel and arranged while inclining along the deflecting locus of the electron beam. Consequently the shift of beam landing can be minimized when the color picture tube is arranged to North or South.

Description

[Detailed description of the invention] % light technology packaging The present invention relates to a color receiver tube.

Technical Background and Distinctive Points of the Invention As shown in Fig. 1, a two-color picture tube consists of an envelope consisting of a glass face 5 (1), a funnel part (2), and a neck part, and a 7-piece part (1). ) is formed in III].

A striped phosphor screen (81) of three colors green and blue, a color sorting device (4) having a large number of electron beam passing holes arranged oppositely near the screen (81), and Electron gun (6) that emits and focuses a beam
). DillM the large number of small holes in the color sorting device (God)
The phosphor screen (8) and the color sorter (4) are arranged in close proximity to each other so that the emitted electron beams land exactly on the corresponding phosphor stripes.

However, the color axis 1 of the reproduced image deteriorates when it is affected by an external magnetic field such as a nose-blowing field. For this reason, conventionally, a sharpening coil body (6) made of a ferromagnetic metal plate has been used which is directly or indirectly latched to the color selection electrode at one end and whose other end extends in the direction of the funnel (2). ing.

Figures 2 to 5 show conventional magnetic J shields (7), (8),
Figure 2 shows an integrally molded quadrangular pyramid-shaped funnel-shaped magnetic bell body (7), which is the basic shape of the magnetic field in the electron beam passage area, and is generally S2 good. However, when using a strong iron board with a fi thickness of 0.1 to 0.3-a, which is mainly composed of iron, 2. In order to ensure a good beam landing (the 2nd is the current non-luminous part). If you urge the spider to fight back, m + > make it fall into the electron beam orbit, or move in a direction that does not affect the beam landing. It is necessary to convert the field component C2 into two.To explain the modulation of a magnetic conductive body, we will first consider two components i of the magnetic field that influence the beam 2nd-2.The most general I
: Since the currently implemented color picture tube uses a striped phosphor screen that is continuous in the 11-plane lateral direction, beam deviation occurs in the vertical direction [7.
No deterioration of dichroic purity occurs. i [111 horizontal axis - 2
．． If the tube axis is 2, then the magnetic field component FiBy+Bs is 1 at the beam landing. Generally, the force exerted on charged particles is called the Lorentz force, which is divided by p:')IJXIB. here? is the electric charge, age is the velocity, and IB is the magnetic flux density. When using electrons like a color picture tube? = −e change × [F] Here, e is an electron'wL bamboo. As mentioned above, a shift in one direction gives two shadows in the beam landing C, so '! Fx = -e(17Bz -'5B7), that is, B
)lb, Bsn each 1. This causes beam landing to shift.

FIG. 6(a) shows the beam shift due to B2. practical 1
The second problem is the beam shift caused by the earth-to-air horizontal component B when the color picture tube is installed facing north, and the directional velocity component of the electron beam due to the deflection of the light beam. Turtle 6 (b)
indicates beam shift due to Byl-.

This is a beam shift caused by the direct magnetic field component Bv in the northern hemisphere and the direct magnetic field component v1 of the electron beam directed from the electron beast to the screen.

The above-mentioned conventional example with two cylindrical shells 11s will be explained.

This is the moth described in No. 3 Public Patent Publication No. 53-15061. This magnetic j11 bush body (8 n has a V-shaped notch on the short side @ (o) i4 L, tee ha 1:1 jl1855
- In Publication No. 36928, the upper and lower ends of the color picture tube screen S
There have been some examples in which a magnetic shield is provided as a courtesy.

In these magnetic bushes, the bidirectional magnetic lines of force that were conventionally absorbed by the short sides are suppressed in the long side direction, and the Bv acid component increases more than before. Looking to the left +
On the other hand, -By increases in Oka.

As is clear from this conclusion in FIG. 6(b), the beam is shifted to the right at the top of the screen and to the left at the bottom of the screen, resulting in the effect of stone rolling. This IIi Fig. 5 (a
) to reduce the beam shift in the basic left rotation direction.
1llI]i[I greatly improves color purity when I is set facing north or south.

When a 1-color picture tube is installed facing east or west, the geomagnetic horizontal component B easily passes through the Kameko beam passing region vI inside the 3m shield f8+. The magnetic flux field in the electron beam passing area ia inside this side sulfur air shield (8) increases and the field shape becomes more barrel-shaped, so that the screen corner C- The closer the distance, the more the Bv component increases, resulting in a trapezoidal beam landing shift.

Figure 4 1m, the cicada ventilation bush shown is 13253 years old
- This was proposed in the kj publication. This magnetic stray body is provided with a high resistance part (6) on the vertical axis, i.e., the l axis, and a specific example thereof is as shown in figure m4, where the notch part is placed on the v axis. .

In such a magnetic flux shield, due to the effect C of the magnetoresistive part (b), the i field B in the x-axis direction is concentrated on the long side I, and the overall shape is a trapezoidal bowl shape @ barrel shape along the wall. Shape: magnetic rod ≦ double-shaped. However, in such a magnetic shielding body, as shown in FIG. 8, since a high magnetic resistance S (b) exists near the core axis, the shaping of the uniaxial magnetic field Bx is localized, and the electron beam is currently passing through the area as shown in the figure. ] The magnetic field distribution will have harmonic components. This means that the beam shift 1 of the color receiver g1w also has the following influence.

That is, for the beam 1 near the corner of the circle, the effect of the upper magnetic resistance S (b) is small and the same beam shift as shown in Fig. 7 occurs, while near the ν axis, that is, from the magnetic resistance t1gl2. In the near portion, beam deviation occurs in the opposite direction to that shown in FIG.

In this way, the landing of the color picture tube becomes localized, and this causes deterioration in workability when adjusting the landing afi4 using the deflection yoke C2, including variations in the landing of a certain root plate due to other causes12. .

In addition, the effect of the above-mentioned j1b plow air resistance section (b) has another drawback since it is not sufficiently smooth or gapful to have any influence on the beam reaching the one side south effect.

This is the effect of shaping the two-axis force rotation field B2 when the IjijM plane is directed north or south C and converting it into B and components.
Disadvantage that the local S: #< is near the magnetoresistive part (b), and the deviation from the ν axis in the direction of north or dF@ becomes large.
□ becomes 1. Again, the beam shift is local.

The magnetic shield (2) shown in Fig.
This was proposed in Publication No. 7, but the structure has 40 to 50 openings in the surface area of the magnetic retardant as the king, and 62 magnetic resistances are used to control the path through which the degaussing coil magnetic field passes. The effect is to reduce the power consumption and promote the heat dissipation effect of the shadow mask, which is different from the purpose of preventing beam shift.

As explained above, in the conventional magnetic shielding body, it is not possible to sufficiently reduce the beam shift relative to the earth's magnetic field C1 over the entire screen. , iI
! 1 IFj IJ is designed to sufficiently reduce the beam landing deviation over the entire IJ and to improve the color blurring and single color unevenness. At least two or more openings with a length of 20 minutes in the beam traveling direction C are distributed in a predetermined relationship on the long side am of the magnetic a thick body made of a plate, and each hole is determined by the +P axis. Quadrant and C: Open hole center or center of gravity is the long side - 6-way F in the wall
i1 center ≦ 2 equal or the upper symmetrical center direction number of the long side - 09 indicates that the direction is deviated By making the beam landing deviation evenly uniform within the area (-), the beam landing deviation is reduced to a light component, and the beam landing deviation is reduced to a fraction of a beam.
The present invention provides a color picture tube with good color unevenness, and further improves the usability of the color picture tube in areas with different geomagnetic fields.

Examples of snake ming The present invention will be explained in detail in Example I.

The structure of the collar tube of the present invention except for the magnetic field is the same as that shown in Figure 1, so the static axis gauge is omitted here. Figure 9 (dissection, (b), (c) tri FIG. 1 is a perspective view, a front view, and a long-side side sound of an embodiment of the magnetic shield according to FIG. 1 of the present invention; FIG.

The decorative body has an opening for passing the electron beam which is opened in the neck of the color picture tube.
It is formed by the provided Daiken triangular notch (to) and the long side 52, and the long side 1111 and 62 are zIIll.
! 1 direction i 2 long opening hole and (to) ν axis and i
They are symmetrical +: 'fikl-, respectively, about the axes.

This opening u? ) is a Daiken soft-angled triangle with a base of 1 on the screen. On the other hand, the hole (2) is in the form of a slit extending in the direction of Yoshiichi Daiken's funnel residence, and is slit in a #4 diagonal pattern along the direction of the deflection trajectory of the Daigon electron beam. The ``+ restraint'' of the air ventilation shield vehicle is 2W, and the hole is open (
17) The central position fl of j (g) is the Daiken l axis or W
2W et al. are located at 3' and 3', respectively.

Further, the length of the hole U7J is about 3 times that of the paper feed 42, and the length of the cut hole (G) is about 15 to 20 times that of the ring.

Next, the effects of this embodiment will be explained.

Chibe @ Wrinkle triangular notch (to) I: Effect Fi As mentioned above, two directions e that were conventionally shaped in the short side wall direction
& Pestle B, by forcing the part of the long side @ in the swing direction to increase the B) component and minimize the beam landing deviation when the color picture tube is installed facing north or inward.

On the other hand, the effects of the long sides of the electric interlocking body CL @ the openings (5) and (g) on the wall are described in detail below.No. 101 describes the effect of the magnetic shield according to the present invention. It is a nostalgic surface drawing. If the color picture tube is placed in the direction of 1 p'' to the east, the earth-air/water half components will be directed toward 10,000 [j2]. It takes BJ for a long time to take magnetic S material■≦2. In the case of the one-piece irradiation shield, the magnetic field distribution in the beam passing region is as follows from the broken line in Fig. 10: 5. Shape beam deviation occurs.

10,000 Komei C2 perforation (b), if a field is installed on the long side wall, this aperture part ll! 1 counter near 1
It is clear that the zero energy magnetic field that generates the zero energy magnetic field (-9) is very strong and has a wide range C2 when the radius L is large. To the book! AFi makes use of this effect to make the magnetic field in the beam 281 area as uniform as possible.

Compared to the radius of the IIIFi aperture (G) of the aperture I, the average diameter has a size of about 5 to 6 @. Was it Mokushi who said it was average? This is because, in lJ, the openings (2) are 12 in the shape of a Daiken triangle as shown in FIG. 9C2.

As a result, the aperture (5) generates a strong and wide-ranging magnetic field (2).
)V is generated, and the aperture (to) generates a relatively weak magnetic increase in a narrow range. (to these waxy magnetic fields)
.

(Conversion) 1 naturally exerts an indirect effect due to the effective field of view (2) it is necessary not to act substitutively on the arriving electron beam.

The magnetic field Can, as described above, is the aperture qη,
(G) There is an effect of trying to move the barrel-shaped magnetic field (4) closer to the axle (2) when the arm is not present.For this reason, the barrel-shaped magnetic field (α-), which conventionally had a large arm bend, is now more straight. It becomes a shape.

■ In this case, as shown in No. 8, only the hole C2 on the toothless shaft is opened α
It is necessary to carefully consider the generation of the harmonic magnetic field share that occurs when a magnetic field exists. That is, as mentioned above, when an aperture is provided in a magnetic shield made of a strong metal structure plate, a local magnetic field is inevitably generated in the vicinity of the aperture, and the generation of harmonic components is unavoidable. hard.

Therefore, even in the case of making the magnetic field uniform, the meaning of making it uniform is to make it uniform within the region of the electron beam aSS where the screen of the color picture tube ≦2 reaches, and by no means applies to the entire Buddhist realm. Furthermore, although this essentially means considering the area that provides the beam landing g and two shadows of the color picture tube, this is sufficient.

Based on the above considerations, the mutual positions and widths of the openings (b) and - are determined.

First, by moving the aperture (5) which exerts a positive influence from the vertical axis toward the diagonal and adding -1 to the beam deviation l-, a beam deviation characteristic as shown in FIG. 11 is obtained.

Here, B and 0 are the positions on the screen shown in FIG. 12(a), C is the corner of the first plane, and B is the intermediate position between the corner of the Ilkl plane and the ν axis. As is clear from Fig. 11, point C, that is, I
[lll11[At the I corner, the movement type decreases as the aperture (5) moves away from the y-axis〇On the other hand, at the intermediate point B, it initially moves in the opposite direction to the movement direction of the corner (lower percentage diagram @
) suddenly increases the amount of movement and becomes the same direction as the corner. It is clear from this characteristic that the optimal position of the aperture m1 is located at a degree below the #ip axis.

In addition, I2 aperture (4 is for making the uniformity of the magnetic field even better, and beam deviation % C2 is for further reducing the deviation of a part of the corner, but the effect of aperture (18I) is If the gap is too large, the entire tri value distribution will change, which is undesirable.Therefore, care must be taken to provide fewer young fruits than open holes.

As explained above using the embodiments, the present invention is characterized by distributing the apertures in a predetermined relationship between the long sides and the corners. This is to suppress and make the beam uniform, and to reduce the beam deviation by a large width and to reduce the color deviation of the color tube by 9 colors.

Another advantage of the effects of the present invention is that in the above-described embodiments, the openings can be made as follows.
The point is that the beam shift C2 at the time of mourning has almost no effect when the beam is installed with the surface facing north or south. The reason for this is thought to be that, as in Example 1 and 2 above, 1: an aperture with a length of g in the beam traveling direction is used. In the conventional example, the east-west beam deviation percentage and the north-south beam deviation percentage show contradictory directions, but the present invention overcomes this difficulty and makes the beam landing deviation extremely small. The resulting color picture tube's color shift and unevenness in one color were greatly improved in any flesh color.

Figures 12(b) and 12(c) compare the amount of beam deviation in the east direction and the north direction of PIi with the conventional example, and show that the loquat cutting pattern and uniformity of the beams have been greatly improved.

Here, B, O indicates the screen position shown in Figure 2 (-), and (←) in the graph is the present invention 1: the above-mentioned embodiment, (b) is the conventional example shown in Heat 3, (f) indicates that the magnetic shield is based on the conventional example 12 shown in Fig. 4.

413 (s) and (b) show another implementation ψIJ according to the present invention.

In FIG. 13(a), the slit-like openings extending i2 in the beam traveling direction are densely distributed in the vicinity of the central axis, and are distributed in an @112 distribution closer to the corners.

FIG. 13(b) shows an example in which only two Daiken triangular openings are disposed on the long sides l and ll-, and a color picture tube with small wrinkles has such a configuration. It can be implemented. In addition, in the above explanation, regarding the triangular opening t
Although I have omitted the detailed explanation, this was done in consideration of the beam trajectory because the Dentsu Ayu body itself has a trapezoidal conical shape, and it is also possible to make the openings near the corners have an inclination angle. This is due to the same reason.

As is clear from the detailed description of the effects of the invention,62 According to the present invention^
It is not only a scale that can greatly improve the color shift and color unevenness of color picture tubes that require high quality, but also has the effect of further improving compatibility with regions with different geomagnetism, and has a very large industrial value.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the configuration of a color picture tube, Figs. 2 to 5 show a conventional magnetic shield, and Figs. 2 and 3 are perspective views. Figure 5 is a side 1 diagram, Figures 6 (a) and (b) are schematic diagrams for calculating mq of beam deviation due to earth spider S2, Figures 7 and 8 are Fi magnetic elevation. Schematic diagram for explaining distribution. wJ9 Figures (a), (b) and (cJ tilt Schematic perspective view, front view and @ side view showing the embodiment of the present invention, 1st
Diagram O is a schematic diagram to explain the distribution of Buddha's realm in Figure 9, and Figure 11 is a characteristic diagram showing the beam shift cover.
Figure 12(a). (b) and (c) Schematic diagrams and characteristic diagrams comparing the east-west and north-south beam shift covers for Fi, respectively, Figure 813 (-
) and (Shun is Honkabuto) is a schematic bacterial diagram showing other examples. (1)...Face 5 (24...Funnel part (8)
1...I1 party body screen (4)...Basashi separate electrode (5shi・electronic!k)...magnetic spear body,
(G)...Open hole (7a17) Agent Patent attorney lit Ken Chika
Yu (#fd-14) Figure 1
Fig. 2 Fig. 51 Fig. 9 <(1,) Fig. 1O Fig. 12 (6z, n (b) Fig. 11 C)

Claims (1)

[Scope of Claims] 1) An electroluminescent screen formed on the inner surface of the front face portion of the outer ring consisting of a face portion, a seven-flange portion, and a neck portion, and an IF arrangement arranged within the neck portion, and the fluorescent material an electron gun structure that emits an electron beam of Ik number to excite the screen to emit light; and a substantially rectangular shape having a large number of electron beam passage holes, which are disposed in close opposition to the electron beam of the phosphor screen described in iii. Color sorting electrode and this color sorting electrode:
Color image receiving with a magnetic overpass body extending directly or directly along the 77 channel 5FF3 surface-2 along the electron gun @1! At the same time, the magnetic shield is made of a substantially rectangular ferromagnetic metal whose end on the side to be secured is symmetrical along the horizontal and self-cord C including the tube axis. The horizontally mounted upper and lower 52 corresponding long sides @ 6; respectively the electron beam observance direction I: 1/3 of the length of the tube axis and the ring extending in the angle direction. At least 2 that are:
more than 1 m2)lli pores, the pores are symmetrically distributed within the 4 quadrants divided by the horizontal and radial lines, and the pore centers or electric cores within the 24 quadrants of the wound
A force 2-picture tube whose % image is that the center of the long side or the center of gravity C in the recording quadrant is equal to or located in the direction of the symmetry center C of the long side. 2) Color image reception described in the special tlF visit category H, characterized in that the width of the first pongee hole in the direction perpendicular to the tube axis is as large as the one close to the phosphor screen.3) 4) A color picture tube according to the dry curve first product of the %1ffl portrait, characterized in that the distribution on the long side of the aperture or the closer to the v#J end of the long side, the more the distribution is distributed. A color picture tube as claimed in claim, characterized in that the width of the aperture in the direction perpendicular to the tube axis is larger than t, which is close to the two-phosphor screen.5) k[Iin! direction in which the aperture extends. has a predetermined angle with respect to the tube axis {2, and the direction g that is the projection of the electron beam trajectory onto the long side of the magnetic overshield ≤2 !ti @ Section 1 Nomushi Section 4 I will receive one color in either case.