JPH01276547A - Color cathode-ray tube device - Google Patents

Abstract

PURPOSE:To displace deflection centers of magnetic fields from each other and improve the convergence of three electron beams on the whole face of a fluorescent screen by constituting a horizontal deflecting device or a vertical deflecting device with deflecting coils forming the barrel type magnetic field and the pin cushion type magnetic field and driving them with different deflection currents. CONSTITUTION:A vertical deflecting coil 15 is constituted of a toroidal coil wound on a ferrite core 18, a horizontal deflecting coil is constituted of two pairs of saddle type coils 16 and 17 wound on the inside of the toroidal coil and having different magnetic field distribution in the tube axis direction respectively. The first and second saddle type deflecting coils 16 and 17 have the characteristic with no convergence drift on the horizontal axis by combining the pin cushion type magnetic field and the barrel type magnetic field. Different currents are applied to the first saddle coil 16 and the second saddle coil 17 to operate this deflecting device. The good convergence characteristic can be obtained over the whole face of a color cathode-ray tube.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a color picture tube device, and more particularly to a color picture tube device with good concentration characteristics of a 37tt daughter beam on a screen. It is something.

(Prior Art) Currently, the mainstream color picture tube of the shadow mask type is one equipped with an in-line type electron gun and a Sloso 1~ type shadow mask. This will be explained based on FIG.

As shown in Figure 2, such a so-called shadow mask or in-line type color picture tube has a phosphor layer formed regularly in dots or bands on its inner surface, which emits light in R, G, and B colors when an electron beam strikes it. A face plate (]) on which fluorescent screens ■ arranged in
) A large number of openings (
12) with a perforated shadow mask ■, an inner shield (14) provided as necessary, and a side wall part (1-
The color picture tube main body is connected to the neck (9) which houses the electron gun (lO) through the funnel ■ in 1), and the funnel ■ is fixed to the outer wall of the neck 0) by the support part (8-1). In such a color picture tube, which is composed of a deflection device (8) attached to the outer wall via a wedge (8-2) and an adjustment magnet (11) attached to the neck 0 outer wall, The electron beam (13) emitted from the electron gun (10) causes a predetermined fluorescent layer of the fluorescent screen (1) to emit light through the opening (13).

``The electron gun (10) normally forms 83 R, G, and 83 electron beams that cause the phosphor layers that emit R, G, and B to emit light, respectively. Among these color picture tubes, which are generally called three-beam shadow mask tubes, currently the mainstream electron gun is an in-line electron gun, in which three electron guns are arranged in a row in the horizontal direction. In a color picture tube using such an in-line electron gun, the electron beams that cause the R, G, and B color phosphor layers to emit light are transmitted through the focusing electrode of the electron gun (lO) during non-deflection when the deflection yoke (8) is not operated. Due to its dimensions, it is designed to concentrate on one point on the fluorescent screen.

In addition, in an in-line electron gun, by appropriately designing the magnetic field of the deflection yoke (8), R, G, and B
It is possible for three beams to pass through one point of the shadow mask (2) at the same time.

Such a magnetic field is well known as shown in Japanese Unexamined Patent Publication No. 57-1857, and is generally employed. That is,
By using a pincushion type magnetic field for the horizontal deflection magnetic field as shown in Figure 3(a) and a barrel type magnetic field for the vertical deflection magnetic field as shown in Figure 3(b), it is possible to eliminate the need for a special correction device. Good convergence characteristics of the three electron beams (hereinafter referred to as convergence characteristics) can be obtained over the entire screen. However, the deflection angle of the color picture tube is 100@, 11
When the value becomes large, such as 0'', the following convergence error becomes noticeable. This is generally called the horizontal line cross characteristic, and cannot be corrected by changing the characteristics of the pincushion and barrel magnetic fields of the horizontal and vertical magnetic fields. This is explained in the document "SST deflection yoke for in-line high-definition color tubes" (
This is shown in Iwasaki et al.'s Technical Report of the Television Society [ED619]. That is, in the commonly used saddle-toroidal deflection yoke, a positive cross pattern (positive anisotropic astigmatism) occurs, and in the saddle-saddle deflection yoke, a negative cross pattern (negative anisotropic astigmatism) occurs. This phenomenon is mainly due to the difference in the position of the deflection center between the horizontal deflection coil and the vertical deflection coil, and generally a saddle toroidal deflection yoke is used for horizontal deflection. The position of the saddle coil is optimized by shifting the position of the toroidal coil in the direction of the deflection yoke axis. This will be explained based on FIG. If the deflection center of the toroidal coil that generates the vertical magnetic field and the deflection center of the saddle coil that generates the horizontal magnetic field are almost the same, the fourth
As shown in Figure (a), a convergence error generally called a positive cross pattern occurs. In order to correct this positive cross pattern, the deflection center of the horizontal deflection saddle coil is shifted toward the electron gun, as shown in FIG.
The cross pattern is modified as shown in C).

When the horizontal deflection saddle coil is further shifted toward the electron gun, a negative cross pattern appears as shown in FIG. 4(b). Therefore, - in general, the relative position I of the horizontal and vertical deflection coils! By properly assembling 1, the cross pattern can be corrected.

However, with this method, the cross pattern can be corrected only at one diagonal point, for example, and a loss pattern as shown in FIG. 5 occurs at other points. Such reversal of the cross pattern between the middle part and the outermost diagonal becomes more noticeable as the deflection angle and screen size increase. Therefore, in the past, a method has been adopted to reduce the outermost cross pattern by attaching a magnetic plate or the like to the deflection yoke, but this method has resulted in insufficient characteristics.

The inventors previously applied for a method in which the deflection centers of two sets of deflection coils are shifted from each other, and the horizontal deflection signal and the vertical deflection signal are deflected in synchronized and different deflections: 11 flows. Although the system of the above-mentioned application has an effect, if the deflection centers of the two sets of deflection coils are shifted to sufficiently eliminate loss-miss convergence, the amount of movement of the deflection centers becomes large.
It turned out that manufacturing the deflection yoke was difficult due to mechanical dimensional constraints.

(Problems to be Solved by the Invention) The problem with the above technology is that the difference in the deflection centers of the two sets of deflection coils is particularly large.

SUMMARY OF THE INVENTION The purpose of the present invention is to solve the above-mentioned problems by dynamically changing the magnetic field into a pincushion or barrel field in order to correct the convergence cross pattern, depending on the deflection bearing. The deflection coil is provided with a pincushion magnetic field, and the other set of deflection coils are provided with a barrel magnetic field, and each is driven with a different deflection current in synchronization with a deflection signal.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a vacuum envelope, a phosphor screen disposed within the vacuum envelope, and an in-line electron gun that irradiates three electron beams toward the phosphor screen. and a color picture tube device comprising a horizontal deflection device that deflects the electron beam in the horizontal direction so that the electron beam impinges on a predetermined area of the phosphor screen, and a vertical deflection device that deflects the electron beam in the vertical direction. The device or at least one of the vertical deflection devices comprises a deflection coil forming a barrel-shaped magnetic field and a deflection coil forming a pincushion-shaped magnetic field, and the deflection coils are driven by different deflection currents, thereby causing each coil to This color picture tube device is characterized in that the deflection centers of the generated magnetic fields are shifted from each other to improve the concentration of three electron beams on the entire surface of the phosphor screen.

The present invention also provides a vacuum envelope, a phosphor screen disposed within the vacuum envelope, and an in-line electron gun that irradiates three electron beams toward the phosphor screen.

A color picture tube device comprising a horizontal deflection device that deflects the electron beam in the horizontal direction and a vertical deflection device that deflects the electron beam in the vertical direction so that the electron beam impinges on a predetermined area of the phosphor screen, the horizontal deflection device or At least one of the vertical deflection devices includes a deflection coil that forms a barrel-shaped magnetic field and a deflection coil that forms a pincushion-shaped magnetic field, and by moving these deflection coils by 1ψ using different deflection currents, three This is a color picture tube device characterized by improving the concentration of electron beams.6 (Function) According to the present invention, it is possible to easily improve the cross pattern by shifting the deflection center of the color picture tube. It is.

The operation of the present invention will be explained below.

First, assume that the vertical toroidal coil is the A coil, and the horizontal saddle coils are the B coil and the C coil. If the convergence characteristic of the deflection device that combines the A coil and the B coil is shown in Fig. 4 (a), the relationship between the deflection center of the horizontal deflection coil and the deflection center of the vertical deflection coil is shown in Fig. 6.
The result will be as shown in Figure (a). In such a case, a combination of all three sets of deflection coils is shown in FIG. It is best to configure it so that it has cross-convergence characteristics. At this time, for example, when deflecting as shown in FIG.
When deflecting to point P1 in the figure, if the deflection current of the B coil is made larger than the deflection current of the C coil, good cross-convergence characteristics can be obtained over the entire color picture tube as shown in FIG.

At this time, if the C coil is formed by a barrel magnetic field and the B coil is formed by a pincushion magnetic field, the correction effect of the positive cross-mistake convergence at 28 points and the negative cross-mistake convergence at 21 points becomes large, and the amount of modulation given to the deflection amount dε can be reduced. . In order to obtain the bending characteristic, it is sufficient to supply current to the horizontal deflection B coil and C coil at a current ratio depending on the amount of deflection. That is, a current as shown in FIG. 8 may be supplied. This deflection current can be obtained by modulating the output current of the deflection circuit with a direct deflection current as shown in FIG. Further, the deflection coils used in the present invention can be easily manufactured by using a structure as shown in FIG. 9, in which the vertical deflection coil is a 1-loidal coil and the horizontal deflection coil is a saddle coil.

In FIG. 9, the deflection device is composed of a vertical deflection 1 to loidal coil (15) wound around a ferrite core (18) and two sets of horizontal deflection saddle coils (16, 17).

(Example) The present invention will be explained in detail based on the drawings.

FIG. 1 is a diagram showing a preferred embodiment of the present invention.

An electron gun (1o) is enclosed within the neck part (9) of the vacuum envelope, and emits an RTV-R-beam (not shown) toward a fluorescent screen (not shown) inside the vacuum envelope. irradiate.

In this embodiment, the deflection device is composed of a saddle-toroidal structure, the vertical deflection coil (15) is preferably composed of a toroidal coil wound around a ferrite core (18), and the horizontal deflection coil is arranged inside the toroidal coil. It is composed of two sets of saddle-shaped coils (16, 17) each having a different magnetic field distribution in the tube axis direction. The two sets of saddle-shaped coils (16, 17) of the horizontal deflection coils are composed of a first saddle-shaped coil (16) and a second saddle-shaped coil (17), and the first saddle-shaped coil (16) is a vertical deflection coil. When combined with the deflection toroidal coil (15), it has a pressure cross convergence characteristic, and the first saddle type coil is configured to form a barrel magnetic field, and the cross convergence shown in FIG. 4(a) Convergence characteristics can be obtained.

When the second saddle-shaped coil (17) is combined with the vertical deflection 1 to loidal-type coil (15), it has a negative cross-convergence characteristic, and the second saddle-shaped coil forms a pincushion-shaped magnetic field. Therefore, the cross-convergence characteristic shown in FIG. 4(b) can be obtained. When three sets of deflection coils are combined: a vertically deflected toroidal coil (15), a horizontally deflected first saddle-shaped coil, and a second saddle-shaped coil, the first saddle-shaped coil and the second saddle-shaped coil are combined. The configuration is such that when the same deflection current is applied to the mold coils, the cross convergence characteristic shown in FIG. 5 is obtained. It is relatively easy to obtain a cross-convergence characteristic that is difficult to obtain.

In the case of such a deflection yoke, it is preferable that the first and second saddle-type deflection coils have a characteristic on the horizontal axis that combines a pincushion-type magnetic field and a barrel magnetic field to have a characteristic without convergence deviation. be. When operating such a deflection device, a current indicated by IC 8 is applied to the first saddle coil, and a current I, I, and the like are applied to the second saddle coil.
By applying a current of 0.001 to 0.05, it is possible to obtain good convergence characteristics over the entire color picture tube.

In this embodiment, the first saddle-shaped coil and the second saddle-shaped coil cover almost the entire surface of the first saddle-shaped coil in the tube axis direction of the color picture tube, and overlap each other as shown in FIG. In this way, the first saddle-shaped coil or the second saddle-shaped coil may form a deflection magnetic field only in a portion of the coil. Further, the vertical deflection coil may also be a saddle type coil instead of a toroidal type coil.

A second preferred embodiment will be explained based on FIG.

In this embodiment, the horizontal deflection coil and the vertical deflection coil are comprised of three sets, all of which are saddle-type coils. In this embodiment, the vertical deflection coil is the first saddle-shaped coil (2
0) and a second saddle-shaped coil (21). The first saddle-shaped coil (2o) and the second saddle-shaped coil have different deflection centers. Here, the first vertical deflection saddle type (2o) coil and the horizontal deflection coil (1
9) preferably exhibits the positive cross-convergence characteristic shown in FIG.
FIG. 13 shows an example of a deflection circuit using a saturable reactor. In this embodiment, a saturable reactor modulated by a vertical deflection current is provided in the middle of two sets of horizontal deflection coils connected in parallel, and the vertical deflection II of the color picture tube is
(Ii' flow characteristics of the water i11 deflection coil 1 and the horizontal deflection coil 2 are respectively configured to be changed according to the water i11 deflection coil 1 and the horizontal deflection coil 2. Also, each saturable reactor is configured to be biased by a permanent magnet, and the color Cross-convergence characteristics across the entire picture tube can be adjusted.

Further, in this embodiment, the saturable reactor is modulated by the vertical deflection current, but it is also possible to modulate by the leakage magnetic flux of the vertical deflection coil. In addition to this example, various circuits using saturable reactors are possible.

It is sufficient that the deflection coils (20, 21) have different magnetic field distributions,
Various shapes are possible.

Further, the two types of current may be applied by two series of outputs from respective deflection circuits, or a structure may be adopted in which the reactance is modulated using a saturable reactor or the like.

In addition, although the deflection magnetic field of the present invention changes the deflection center and the magnetic 71 distribution, the deflection center of the deflection magnetic field is precisely based on the beam trajectory of the color picture tube, but it is defined by the center of gravity of the coil. It may also be defined by the position of the maximum value of the deflection magnetic field, and if these values are different, the deflection center will also be different, so in normal cases, these positions can be used instead.

When they are combined, it is preferable to configure them so that they have negative cross convergence characteristics as shown in FIG. 4(b). In addition, when the first and second vertical deflection saddle type coils and the horizontal deflection coil (19) are combined and the same deflection current is applied to the first and second vertical deflection saddle coils, the cross convergence characteristics shown in Fig. 5 are obtained. It is preferable to configure it so that it has.

In this embodiment, it is preferable that the first vertical deflection coil has a barrel-shaped magnetic field and the second vertical deflection coil has a pincushion-shaped magnetic field.

In the case of this embodiment, it is preferable to apply the deflection amount dε shown in FIG. 12. That is, it is a positive cross pattern. When the amount of vertical deflection is small, if the current IB applied to the first vertical deflection saddle coil (20) is larger than the current A applied to the second vertical deflection saddle coil (21), a positive cross pattern is generated. Correct.

It becomes a negative cross pattern. If the amount of vertical deflection is human, the current applied to the second vertical deflection saddle coil (21) ■A
is larger than the current I11 applied to the first vertical deflection saddle coil (20) and corrects the negative cross pattern.

Therefore, good convergence characteristics can be obtained over the entire screen.

In this embodiment as well, the first and second vertical FIGS. 14A and 14B show an example of a deflection circuit using a diode, which is used in the present invention. This embodiment is suitable for obtaining current characteristics as shown in FIG. In this embodiment, a desired current is applied to each vertical deflection coil using the nonlinear current-voltage characteristic of the diode, and the current value of each vertical deflection coil is R,, It, , R,.

Deflection is easily possible by adjusting the value of R4.

In the actual IAp example shown below, only two sets of coils with different magnetic field distributions and deflection center differences are shown, but even if only the magnetic field distribution is changed, the effect will decrease, but it can be used sufficiently as a cross misconvergence correction effect. It is possible.

〔Effect of the invention〕

According to the present invention, an image with good convergence characteristics can be obtained over the entire screen of a color picture tube, and has great industrial utility value.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention, FIG. 2 is a sectional view illustrating a conventional color picture tube device, and FIG.
The figure is a diagram for explaining the deflection magnetic field used in a conventional color picture tube device. Figures 4 and 5 are diagrams for explaining the cross-convergence characteristics of a conventional color picture tube. FIG. 7 is a diagram showing the deflection magnetic field distribution of the present invention, FIG. 7 is a diagram showing convergence according to the present invention, FIG. 8 is an explanatory diagram of the current flowing in the example, and FIGS. 9 and 10 are schematic diagrams of the deflection device of the present invention. FIG. 1... Face plate 2... Fluorescent screen 3...
Shadow mask 4...Mask frame 51. Panel pin 6...Spring 7...Funnel
8...Deflection yoke 9...Neck IO...
- Electron gun 11... Adjustment magnet 12... Opening 13... Electron beam 14... Inner shield 15... Toroidal coil 16... First horizontal deflection saddle coil 17... No. 2
Horizontal deflection saddle coil 18...Ferrite core agent Patent attorney Nori Chika Ken Yudo Take Hana g Hisao Suo 2 3 Fig.7 Continued Supplementary IF (self-prompted), Showa, Month 11

Claims (2)

[Claims] (1) A vacuum envelope, a phosphor screen disposed within the vacuum envelope, an in-line electron gun that irradiates three electron beams toward the phosphor screen, and an in-line electron gun that irradiates three electron beams toward the phosphor screen. In a color picture tube device equipped with a horizontal deflection device that deflects an electron beam in the horizontal direction so as to strike a predetermined region of the electron beam, and a vertical deflection device that deflects the electron beam in the vertical direction, at least one of the horizontal deflection device and the vertical deflection device , consists of a deflection coil that forms a barrel-shaped magnetic field and a deflection coil that forms a pincushion-shaped magnetic field, and by driving these deflection coils with different deflection currents, the deflection centers of the magnetic fields formed by each coil are mutually aligned. A color picture tube device characterized in that the three electron beams are shifted to improve the concentration of three electron beams on the entire surface of a phosphor screen. (2) A vacuum envelope, a phosphor screen disposed within the vacuum envelope, an in-line electron gun that irradiates three electron beams toward the phosphor screen, and an in-line electron gun that irradiates three electron beams toward the phosphor screen; In a color picture tube device equipped with a horizontal deflection device that deflects an electron beam in the horizontal direction so as to strike a predetermined region of the electron beam, and a vertical deflection device that deflects the electron beam in the vertical direction, at least one of the horizontal deflection device and the vertical deflection device , consists of a deflection coil that forms a barrel-shaped magnetic field and a deflection coil that forms a pincushion-shaped magnetic field, and by driving these deflection coils with different deflection currents, the three electron beams can be well concentrated on the entire surface of the phosphor screen. A color picture tube device characterized by: