JPS60170143A - Picture tube device - Google Patents

Abstract

PURPOSE:To improve a beam spot shape and improve the resolution of a screen by arranging a pair of winding sections extending in the vertical deflection direction of an auxiliary deflection coil so that the vertical deflection magnetic field near the tube axis from the cathode surface to the main lens surface of an electron gun can be made a specific value or less. CONSTITUTION:A picture tube is provided with a deflection unit constituted of a deflection yoke 24 having a toroidal-type vertical deflection coil 42 from a funnel 33 to a neck 35 and auxiliary deflection coils 16 connected synchronously with the vertical deflection coil 42 and generating the magnetic field in the opposite direction to that of the vertical deflection magnetic field. A pair of the said auxiliary deflection coils 16 are arranged on the right and left around the neck 35, they are made with an annular body having a pair of winding sections extending in the axial direction of the picture tube and a pair of winding sections extending in the vertical deflection direction, and the pair of winding sections extending in the vertical deflection direction are arranged so that the vertical deflection magnetic field near the tube axis from the cathode surface 21 to the main lens surface of the electron gun 34 can be made about 2 gausses or less.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a picture tube device, and more particularly, to a toroidal-type vertical deflection coil and a synchronously connected auxiliary deflection coil. A picture tube device comprising a coil.

[Technical background of the invention and its problems]

In a picture tube device, such as a color picture tube device, the deflection device includes a pair of horizontal deflection coils, a pair of vertical deflection coils, and an annular core.

These deflection coils include saddle-type coils and toroidal-type coils, and there are three types of combinations of these (two-dimensional and υ deflection devices). Among them, the currently mainstream one is a horizontal deflection coil. This is a semi-toroidal deflection device that uses a saddle-shaped coil and a toroidal coil as the vertical deflection coil.

Since the deflection device takes convergence (the two horizontal deflection magnetic fields become a bottle cushion magnetic field as a whole, and the vertical deflection magnetic field becomes a barrel magnetic field as a whole, in order to further correct raster distortion, on the phosphor screen side, the vertical deflection magnetic field and the horizontal deflection The magnetic field is also formed by a bottle cushion magnetic field (two.

In addition, a deflection device equipped with an auxiliary deflection coil synchronously connected to a vertical deflection coil or a horizontal deflection coil in order to form a barrel-shaped or bottle-cushioned magnetic field shape is also disclosed in Japanese Patent Laid-Open Nos. 48-86429 and 51-65524. , 5i
-65525, 55-43701 etc. have been proposed. The auxiliary deflection coil is disposed on the electron gun side or the phosphor screen side, and is designed to generate a magnetic field in the same or opposite direction to the main deflection coil.

Next, FIGS. 1 to 3 will explain a conventional semi-toroidal deflection device.

That is, a toroidal vertical deflection coil (2) is wound around an annular core (1), and a saddle shop's horizontal deflection coil (3) is arranged inside it.The vertical deflection of this deflection device The magnetic field (4) is a two-barrel magnetic field as shown by the solid arrow, the horizontal deflection magnetic field (5) is a bottle cushion magnetic field as shown by the dashed arrow, and the horizontal deflection magnetic field (5) is a two-barrel magnetic field as shown by the dashed arrow. ) outside (= does not necessarily leak force, but the leakage magnetic field (6) of the vertical deflection magnetic field (4) to the outside is large.

In addition, as shown in Figure 3 (the magnetic field distribution on the two tube axis (z) is also indicated by the broken line, the peak magnetic field of the horizontal deflection magnetic field (7) is large,
On the other hand, the vertical deflection magnetic field (8) shown by the solid line gradually spreads and becomes the electron gun (9).
) The magnetic field, that is, the leakage magnetic field (81) extends to the side.

By the way, the leakage magnetic field (8,
) affects the electron beam trajectory ζ2, deflects the magneton beam incident on the king lens of the electron gun (9), and causes the center of the electron beam to shift from the center of the main lens (2).

As a result, the electron beam is subjected to extra lens aberrations of the main lens, causing the beam spot shape to deteriorate on the phosphor screen surface of the picture tube. That is, the fourth
As shown in the figure (at the center <0> of the second screen, there is a high brightness core (
Only the IG appears (on the other hand, in the case of vertical deflection, the effect of the leakage magnetic field (8□) explained in Fig.
A vertically long one-low α force is generated in the direction of the center (0) of the screen (indicated by two diagonal lines), and a halo (11) and core (1'4) are generated.
There is a problem that the center of the screen is shifted and the resolution of the screen is degraded.

To give an example of the vertical deflection magnetic field pushing C2 on the electron gun (9) side, in a 90° deflection tube with a 14V 22.5mφ neck, the peak magnetic field is about 40 Gauss.
) has a magnetic field of 3 gauss on the cathode surface and 7 gauss on the main lens surface, which is quite high compared to the earth's magnetic field of 0.3 gauss.
This magnetism has a great influence on the beam spot shape 42. On the other hand, the horizontal deflection magnetic field has a peak magnetic field of about 54 gauss, 0.5 gauss on the cathode surface, and only about 2 gauss on the main lens surface, so that the influence on the beam spot shape C2 is small.

As a countermeasure to this problem, there is a proposal to use a ferromagnetic material such as permalloy for the electron gun material to shield the leakage magnetic field toward the electron gun side. In case, there are 2 magnets for beauty correction and 4 poles for quiet convergence correction attached to the outside of the neck/wall.

There are problems such as the magnetic field of the hexapole magnet is shielded by ferromagnetic material (= does not penetrate the electron beam trajectory (20 minutes), and it is difficult to correct the utility and convergence.

[Purpose of the invention]

The present invention has been developed in view of the above-mentioned problems (-), and it is possible to correct the deterioration of the beam spot shape on the screen when using a semi-toroidal deflection device, while also making it possible to correct the deterioration of the beam spot shape on the screen. The object is to provide a picture tube device with a deflection device that can be improved.

[Summary of the invention]

That is, the present invention provides a picture tube consisting of a panel on which a C2 phosphor screen is adhered on the inner surface, a neck connected to this panel via a funnel and housing an electron gun, and a neck ( : a deflection device consisting of a deflection yoke having at least a toroidal-type vertical deflection coil; and an auxiliary deflection coil connected synchronously with the vertical deflection coils ζ and generating a magnetic field in the opposite direction to the vertical deflection magnetic field. In a picture tube device (= in which two auxiliary deflection coils are arranged on the left and right sides of the outer periphery of the neck, two pairs of auxiliary deflection coils are arranged in the tube axis direction of the picture tube (two extended pairs of windings and a vertical deflection direction C and two pressed pairs). The vertical deflection magnetic field in the vicinity of the tube axis from the cathode surface of the electron gun to the main lens surface is approximately 2. This is a picture tube device characterized in that two tubes are arranged so that two Gaussian tubes can be used.

[Embodiments of the invention]

Next (2) An embodiment of the present invention will be explained from FIGS. 5 to 9 (2).

That is, the inner surface (=the panel (34) on which the phosphor screen 00 is adhered, and the neck (34) that houses the electron gun (B) connected to this panel C1''' through the funnel (C)).
The outer periphery of the picture tube consists of the funnel (C) to the neck (To) (2 is the annular core (4υ), with a nidroidal vertical deflection coil (4υ) wound around it, and a saddle inside it. The semi-toroidal type horizontal deflection coil (4-shaped semi-toroidal type deflection yoke) is installed, which is almost the same as in the conventional example. Deflection coils (43+-) are synchronously connected, and auxiliary deflection coils uI19, which generate a magnetic field in the opposite direction to the vertical deflection magnetic field formed by the vertical deflection coils (4), are attached to the left and right (two bowls) in contact with the outer periphery of the necks G. Sub-gun (two plane symmetrical positions (= mounting, deflection yoke (goods) and auxiliary deflection coil U6) (the two constitute a deflection device).

This auxiliary deflection coil tti is arranged in the tube axis (Z) direction (=extended pair of windings u1. Line surface.

It has a rectangular shape made of a u-barrel, and its surface is covered with a flexible insulating layer (not shown). Then, in the vertical deflection direction (one of the extended windings 0η is the electron gun t34), the cathode surface (21)i is at a position corresponding to ('''), the winding part a on the dovetail side is the tip of the electron gun. The part (2) is located slightly on the cathode surface (21) side (2).

In addition, 2-pole and 4-pole for purity/static convergence correction
The pole, hexapole magnet (14) is provided above the auxiliary deflection coil (== provided), and the deflection yoke is also attached to a part of the portion C23+ of the auxiliary deflection coil (= upper width of 1e).

The auxiliary deflection coil α0 is the vertical deflection coil (4) (
= connected in series, current flows synchronously between the vertical deflection coils (4 sides), and during vertical deflection, the vertical deflection coils (42
The direction of the current is in the direction of the arrows (27a) and (27b) in Figure 8 so as to generate a magnetic field (c) in the opposite direction to the magnetic field (a).
), (27c).

(27d).

Next, the effect of the auxiliary deflection coil uO will be explained.

In other words, as mentioned above (-), it is the leakage magnetic field of the vertical deflection coil (4) from the cathode surface t11 to the soil lens that causes the center of the electron beam to shift from the main lens. α(19≦2) Generating a magnetic field (from 2, the magnetic field on the cathode surface and υ on the Shao-oh lens surface decreases, and the amount of deflection of the electron beam before entering the earth lens decreases, The extra aberrations can be reduced.

Therefore, the shape of the beam spot on the phosphor screen G3+) can be improved, and the resolution of the screen can also be improved.

At this time, the effect is great if the leakage magnetic field is made to be about the same magnitude as the leakage magnetic field of the horizontal deflection magnetic field, that is, about 2 Gauss or less.

For example, in the same way as before, in a t=14 V 22.5Hφ90° deflection tube, the cathode surface I2 of 25 wisteria than the glass stem structure.
→ Arrange the winding part nearby, further (= 301 proverbial position (2 winding part α barrel is arranged, and the winding parts αe, t2G are spaced 20 meters apart (2) and (- auxiliary deflection coil When the number of turns of e is 43, the magnetic field of the electron gun (b) is approximately 0 at the cathode surface eυ.
．． 5 gauss, approximately 2 gauss at the main lens surface (decreased by 2, 9th
As shown in the figure (=), the beam spot shape on the double vertical axis (y) is such that the center of the core (to) and the center of the opening (c) almost coincide, and the vertical length of the -low (21) has also been improved by about 20%. Ta.

It should be noted here that if the picture tube is a color picture tube, a ferromagnetic element is attached to the tip Q of the electron gun (toward) to correct the coma aberration of the three Kameko beams. However, if the magnetic field in this area is too small, it will not be possible to correct the bicoma aberration.
In order not to reduce the magnetic field near 27J, the winding section U in the vertical deflection direction must be located at a position that does not interfere with the action of the ferromagnetic element for correcting coma aberration.

In the above embodiment, the shape of the auxiliary deflection coil is rectangular, but it is not necessarily rectangular and may be trapezoidal or semicircular.
Similar effects can be obtained if the vertical deflection direction (position of the extended winding portion) of the embodiment is satisfied.

Further, as the horizontal deflection coil, either a saddle type or a toroidal type may be used.

〔Effect of the invention〕

As mentioned above, according to the present invention (2), the magnetic field leakage of the vertical deflection coil of the toroid can be easily removed from the outside without affecting the purity/silence convergence correction magnet (2), especially from the cathode surface of the electron gun (2). It is possible to reduce the leakage magnetic field to the soil lens surface, improve the beam spot shape, and improve the screen resolution.

[Brief explanation of drawings]

Figure 1 shows the horizontal deflection magnetic field of a semi-toroidal deflection device.
An explanatory diagram showing the vertical deflection magnetic field. Figure 2 is a perspective view of a semi-toroidal deflection device. 1s3 diagram is a graph showing the magnetic field distribution on the tube axis of a semi-toroidal deflection device. Figure 4 is a diagram showing the magnetic field distribution during vertical deflection. Explanatory diagrams showing beam spots, Figures 5 to 9
The figures show one embodiment of the picture tube device of the present invention, FIG. 5 is a sectional view for explanation, FIG. 6 is an explanatory view of the main part of FIG. 5, and FIG. 7 is a vertical deflection coil and an auxiliary FIG. 8 is an explanatory diagram showing the magnetic field with the deflection coil, FIG. 8 is an explanatory diagram showing the direction of the current flowing through the auxiliary deflection coil and the direction of the magnetic field, and FIG. 9 is an explanatory diagram showing the beam spot during vertical deflection. 1.41... Annular core 2.42... Vertical deflection coil 3.43... Horizontal deflection coil 4, 8.26... Vertical deflection magnetic field 5.7... Horizontal deflection magnetic field 6.8 ...-Leakage magnetic field 9.34...Electron gun 10.12.28...Core 11.29...-1 row 16...Auxiliary deflection coil 21-...Cathode surface n...Electron gun Tip part -・
・Deflection yoke 5...Magnetic field of auxiliary deflection coil 31...
・Phosphor screen 32...Panel 33...Funnel Ah...Neck agent Patent attorney Inoue - Male Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure l Mi

Claims (1)

[Claims] A picture tube consisting of an inner surface (= a panel on which a phosphor screen is deposited) and a neck connected to this panel via a funnel and housing an electron gun; A picture tube comprising a deflection device comprising a deflection yoke having at least a toroidal vertical deflection coil, and an auxiliary deflection coil connected synchronously with the vertical deflection coil C and generating a magnetic field in the opposite direction to the vertical deflection magnetic field. In the apparatus, the auxiliary deflection coils are arranged in pairs on the left and right sides of the outer periphery of the neck, and in the tube axis direction of the picture tube (=the extended pair of windings and the vertical deflection direction (
an annular body having at least two elongated pairs of winding portions; In order to make the vertical deflection magnetic field in the vicinity less than about 2 Gauss (
A picture tube device characterized in that: