JPH054191Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cathode ray tube equipped with an electron gun having a convergence plate.

[Summary of the idea]

The present invention is a cathode ray tube that can effectively correct horizontal misconvergence in the center and periphery of the screen by independently supplying voltage to the outer convergence plate that constitutes the convergence plate of the electron gun. For this configuration, the tips of the two lead wires led from the anode button are spread out to prevent the lead wires from coming into contact with the beat glass.

[Prior Art] The Trinitron (registered trademark) cathode ray tube electron gun is a so-called one-gun, three-beam single electron gun, in which three electron beams emitted from three cathodes intersect at the center of the main lens. After that, these three electron beams are dispersed, but the feature is that these three electron beams converge (concentrate) again on the screen by a convergence means. Specifically, this convergence means is composed of four convergence plates, each consisting of an inner convergence plate and an outer convergence plate, each of which forms a pair. An anode voltage HV is applied by the means, and a convergence voltage CV having the same potential lower than the anode voltage is applied to the pair of outer convergence plates. Then, convergence adjustment is performed by changing the DC voltage CV supplied to the outer convergence plate to connect the R (red) beam located on both sides of the G (green) beam.
This is done by changing the way the beam and B (blue) beam bend.

[Problem that the invention attempts to solve]

As mentioned above, convergence is adjusted by changing the voltage CV supplied to the convergence plate, but as shown in Figure 4, due to assembly errors of the electron gun, even if convergence is adjusted, the center of the screen In this case, when the G beam and the R beam are concentrated, the B beam may deviate from the concentration point, so-called horizontal misconvergence. Conventionally, as shown in FIG. 5, this horizontal misconvergence is corrected using hexapole magnets 61a~
According to this method, even if convergence is obtained, the beam spots 62R, 62G, and 62B are distorted due to the influence of the magnetic field, as shown in Figure 6.
There was a problem that the shape was distorted. This problem,
This has become more noticeable as the resolution of cathode ray tubes has increased.

In addition, as shown in Figure 3, convergence is achieved even around the screen by the deflection yoke DY, but in reality, there are errors in the assembly of the deflection yoke, and when the electron gun is enclosed in the neck part. When the R and G beams are combined, an asymmetrical misconvergence may occur in which the B beam is shifted in the horizontal direction due to variations in the deflection yokes, mounting variations in the deflection yoke, and the like. Conventionally, when the B beam is symmetrically shifted from the R beam with the G beam as the center, this has been done by dynamically applying a voltage with a common disjoint waveform to the outer convergence plate. However, it has not been possible to correct horizontally asymmetrical misconvergence at both ends of the screen on the X-axis and at the four corners of the drawing using the prior art.

The present invention provides a cathode ray tube capable of solving the above-mentioned misconvergence problem, and particularly a convergence voltage supply means therefor.

[Means for solving problems]

This invention consists of an inner convergence plate to which the anode voltage HV is applied and a convergence voltage
Electron gun 6 having a convergence plate consisting of an outer convergence plate to which CV is applied
In the cathode ray tube 1 equipped with
Outer convergence plates 8c, 8d for deflecting beams 9R, 9B located on both sides of G
The two lead wires 16a, 1 led from the anode button 12 for supplying the convergence voltage CV to the outer convergence plates 8c, 8d independently.
At least the bead glass 36
It should be widened by the width of .

Note that the actual deflection is determined by the inner convergence plates 8a, 8b and the outer convergence plate 8.
The convergence plate for deflection mentioned above particularly refers to the outer convergence plate 8c, 8d.

[Effect]

According to the present invention, two lead wires 16a, which are led from the anode button 12 to independently supply voltage to the outer convergence plates 8c, 8d,
The tip portions 35a, 35b of the conductive pipes 33a, 33b on which the conductive pipes 16b are disposed are at least made of bead glass 3.
Since the beet glass 36 is widened by the width of
It is possible to solve the so-called push-up problem caused by contact with a and 35b. Note that if the conductive pipes 33a, 33b are pushed up by the bead glass 36, the conductive pipes 33a, 33
b may bend upward and become an obstacle to the electron beam.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a Trinitron (registered trademark) type cathode ray tube 1 according to this embodiment. The tube body 2 of this cathode ray tube 1 includes a panel portion 3, a funnel portion 4
and a neck part 5, and an electron gun 6 is mounted inside the neck part 5. On the stem side of the electron gun 6, three cathodes 7R, 7G, and 7B corresponding to red (R), green (G), and blue (B) are arranged in-line.
For these cathodes, a first grid G ₁ , a common second grid G ₂ , a third grid G ₃ , a fourth grid G ₄ and a fifth grid G ₅ are sequentially arranged coaxially, and the fifth grid G A convergence means 8 is arranged after the convergence means ₅ . The convergence means 8 includes inner convergence plates 8a and 8b arranged vertically opposite each other across the axis, and these inner convergence plates 8a and 8.
It consists of outer convergence plates 8c and 8d arranged on the outside of b so as to face each other across the axis. Inner convergence plates 8a, 8b
are electrically and mechanically connected to the fifth grid _G5 , respectively. The first grid _G1, the _second grid G2, and the third grid _G3 have through holes through which electron beams 9R, 9G, and 9B corresponding to red, green, and blue taken out from the respective cathodes 7R, 7G, and 7B pass. is drilled. And the third and fourth
A main electron lens is constituted by the fifth grid G ₃ , G ₄ , G ₅ , and each electron beam 9R, 9G, 9B
After crossing approximately at the center of the main electron lens, the central beam 9G and the R (red) beam 9 located on both sides
R and B (blue) beams 9B diverge. center G
(Green) Beam 9G passes straight between the inner convergence plates 8a and 8b, but
The beams 9R and B beams 9B are deflected between the inner convergence plates 8a, 8b and the outer convergence plates 8c, 8d, which face each other, and are again focused on the fluorescent screen. For this deflection, the inner convergence plates 8a, 8b have a fifth grid.
Since the free end of the conductive elastic contact piece 10 attached to G ₅ is in contact with the internal conductive film 11 , an anode voltage HV is supplied via the anode button 12 . On the other hand, the outer convergence plates 8c and 8d are supplied with the convergence voltage supply means of the present invention, respectively.
A voltage is independently supplied to d. That is, for this purpose, as shown in FIGS. 7 and 8, the anode button is insulated with Jura glass (barium glass containing alumina powder) 14 in the center of a shell 13 made of a conductor for supplying the anode voltage HV. Pin 1 made of a conductor for supplying independent voltage to each of the outer convergence plates 8c and 8d
An anode button 12 is used which is constructed by providing two parallel pieces 5a and 15b. Also, Figures 9 and 10
As shown in the figure, first a first pin 15a made of a conductor for supplying voltage to one of the convergence plates 8c is formed inside a shell 13 made of a conductor, insulated with Jura glass 14, and then this pin 15a is It is possible to use an anode button 12 constructed by forming a second pin 15b made of a conductor for supplying voltage to the other convergence plate 8d and insulated with a Jura glass 14 inside the convergence plate 8d. Alternatively, as shown in FIG. 11, a conventional anode button 12 having one conductor pin insulated with Jura glass inside the shell is used to supply voltage to each of the outer convergence plates 8c and 8d. Therefore, a configuration in which two funnel portions 4 are provided on the left and right sides may be considered.
However, with this configuration, it is necessary to change the structure of the conventional funnel section 4, and a long high-voltage lead wire is disposed around the cathode ray tube, which may cause electrical leakage. Therefore, in practice, the anode button 12 according to the above two configurations is
is more suitable.

The shell 13 and the pins 15a, 15b are made of, for example, 426 alloy, and their surfaces are treated with an oxide film.

The voltage is supplied from this anode button 12 to each outer convergence plate 8c, 8d in the following manner.

First, the anode button 1 shown in FIGS. 7 and 8
2, two pins 15a formed in parallel,
As shown in FIGS. 12 and 13, the connector 17 for connecting the lead wires 15b and the lead wires 16a, 16b is mounted on a ceramic substrate 18 having through holes corresponding to the two pins 15a, 15b. pin 15
It is constructed by fixing metal pieces 20a and 20b with a holding member 21, each having a bent portion 19 that can hold the metal pieces 20a and 15b. Then, the lead wires 16a and 16b which are to supply voltage to the respective outer convergence plates 8c and 8d are connected to the respective metal pieces 20a and 16b.
20b, and connect the lead wires 16a, 16b and pins 15a, 15 via the metal pieces 20a, 20b.
Make an electrical connection with b. Next, in the case of the anode button 12 shown in FIGS. 9 and 10, two coaxial pins 15a and 15b and a lead wire 16
The connector 17 for connecting a and 16b is
As shown in FIGS. 14 and 15, the central pin 15
A through hole 22 with sufficient margin is provided so as not to contact the outer pin 15, and both ends 23a and 23b are connected to the outer pin 15.
The central pin 15b can be held between the lower metal piece 24 which is bent so as to contact the side surface of a, and the ceramic plate 26 which is provided with a through hole 25 through which the central pin 15b can pass. It has an upper metal piece 27 on which a bent portion 19 is formed. Lead wires 1 to supply voltage to the respective outer convergence plates 8c and 8d
6a and 16b to the upper metal piece 27 and the lower metal piece 24
The lead wires 16a, 16b and the pins 15a, 15b are electrically connected via these metal pieces 27, 24. In addition, when this connector 17 is used, since the lead wires 16a and 16b are connected in the vertical direction, it is necessary to twist them at 90 degrees midway along the inner surface of the funnel portion 4. This twisted portion 28 is preferably provided within 25 mm from the pins 15a, 15b.

1, 2, 16 and 17.
As shown in the figure, a shield body 29 is provided to cover the anode button 12 and connector 17 within the funnel portion 4. This shield body 29 consists of an upper member 30 and a lower member 31 that fit together, and the lead wire 1
Since the twisted portion 28 when connecting the members 6a and 16b in the vertical direction is also included in the shield body 29, protrusions 30a and 31b are formed in the direction of the lead wires 16a and 16b of both members 30 and 31. This shield body 29 is provided especially to prevent short circuits from occurring due to the getter material during gettering.

Both lead wires 16a and 16b connected to the anode button 12 are guided along the inside of the funnel section 4 to the neck section 5, where they are connected to the respective outer convergence plates 8c and 8d by the following means. Note that the lead wires 16a, 16b are covered with an insulating material 32, and the lead wires 16a, 16b are covered with an insulating material 32.
16b is the insulating material 32 and the conductive pipes 33a, 3
It is inserted in 3b. Lead wires 16a, 16
As shown in FIGS. 1, 2, and 18 to 21, the connection means 34 to each outer convergence plate 8c, 8d of b is a conductive pipe 33a, 3, as shown in FIGS.
Expand the tips 35a and 35b of 3b into a V shape,
Make sure that the bead glass 36 of the electron gun 6 does not hit the connecting means 34 (this V-shaped tip 35a,
35b is set to have at least the width of the bead glass 36, for example, about 12 mm)
A conductive elastic contact piece 37a,
37b is integrally formed with a thin plate-like elastic material 38
It is constructed by welding a and 38b. 43
is an insulated pipe. A support spring 41 having a bilaterally symmetrical shape and having a base 40 welded is provided along a V-shaped portion 39 made up of two conductive pipes 33a and 33b. This support spring 41 is provided to support the lead wires 16a, 16b and prevent their movement by contacting the internal conductive film 11 of the neck portion 5. In addition, the internal conductive film 1
1 and the conductive pipe 33 through the support spring 41.
By applying the anode voltage HV to a, 33b, it is possible to avoid disturbance of the electric field caused by the lead wires 16a, 16b, to which the convergence voltage CV is applied, being disposed within the funnel portion 4.
This support spring 41 has a conductive thin plate at the base 4.
It can be made by punching so that the 0's are connected. Moreover, as shown in FIG.
It can also be formed by welding linear conductive elastic material to each of a and 33b. According to the support spring 41 having the above-described structure, it is possible to obtain an effect that eddy currents due to the electric field of the deflection yoke are less likely to occur, compared to support springs having a conventional structure.

[Effect of idea]

The present invention provides a convergence voltage supply means having an optimal structure in a cathode ray tube for correcting misconvergence in the horizontal direction.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of the embodiment, FIGS. 3 and 4 are views showing misconvergence, FIG. 5 is a view showing the correction state, and FIG. 6 is a view showing distortion of spot shape. Fig. 7 is a perspective view of the anode button, Fig. 8 is a sectional view of the anode button, Fig. 9 is a perspective view of another anode button, Fig. 10 is a sectional view of another anode button, and Fig. 11 is a sectional view of another anode button. 12 is a plan view of the connector; FIG. 13 is a side view of the connector; FIG. 14 is a side view of another connector; FIG. 15 is a perspective view of another connector; 17 is an exploded perspective view of the shield, FIG. 18 is a front view of the connecting means, FIG. 19 is a plan view of the connecting means, FIG. 20 is a side view of the connecting means, and FIG. FIG. 21 is a perspective view of the connecting means, and FIG. 22 is a perspective view of another connecting means. 1 is a cathode ray tube, 3 is a panel part, 4 is a funnel part, 5 is a neck part, 6 is an electron gun, 8 is a convergence means, 8a, 8b are inner convergence plates, 8c, 8d are outer convergence plates, 11 is an internal conductor membrane, 12 is an anode button,
15a, 15b are pins, 16a, 16b are lead wires, 29 is a shield body, 34 is a connecting means, 35
A and 35b are tip portions, 37a and 37b are elastic contact pieces, and 38a and 38b are elastic members.

Claims (1)

[Claims for Utility Model Registration] In a cathode ray tube equipped with an electron gun having convergence plates, for the convergence plates for deflecting beams located on both sides of the central beam,
Voltage is supplied independently to each of the convergence plates, and the tips of the plurality of lead wires led from the anode button for supplying voltage to the convergence plate are widened by at least the width of the bead glass. cathode ray tube.