JPS63166127A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To facilitate exact correction of horizontal misconvergence by applying voltages independently to respective convergence plates for deflecting beams disposed on both sides of a central beam. CONSTITUTION:Convergence voltages are applied independently to respective external convergence plates 8c and 8d for deflecting beams 9R and 9B which are positioned on both sides of a central beam 9G. Hence, even if there are errors on assembling an electron gun 6, scatterings on mounting the electron gun 6, errors on assembling a deflection yoke, and scattered errors on mounting the deflection yoke, then deflecting states for R beams 9R and B beams 9B are regulated independently, so that exact correction of horizontal misconvergence can be performed at central and peripheral parts of a screen.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode ray tube equipped with an electron gun having a convergence plate.

[Summary of the invention]

The present invention makes it possible to satisfactorily 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.

[Conventional technology]

The electron gun of the Trinitron (registered trademark) type cathode ray tube 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 and then disperse. , these three electron beams are again converged (concentrated) on the screen by a convergence means. Specifically, this convergence means is composed of four convergence plates each consisting of a pair of inner convergence plates and an outer convergence plate.
11 An anode voltage HV is applied to the convergence plate by a voltage supply means provided on the tube wall of the funnel portion of the cathode ray tube, and a convergence voltage C■ of the same potential lower than the anode voltage is applied to the paired outer convergence plate. do. And the convergence adjustment is
This is done by changing the DC voltage C2 supplied to the outer convergence plate to change the way in which the R (red) beam and B (blue) beam located on both sides of the G (green) beam are bent.

[Problem that the invention seeks to solve]

As mentioned above, convergence is adjusted by changing the voltage C 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 ,G
When the beam and the R beam are concentrated, the B beam may deviate from the focal point, which is so-called horizontal misconvergence. Conventionally, as shown in FIG. 5, this horizontal misconvergence is corrected using six-electrode magnets (61a) to (
61f), but even if convergence is obtained, as shown in Figure 6, the beam spots (62R) and (62G) are distorted due to the influence of the magnetic field.

(62B) There was a problem that the shape was distorted. This problem has become more prominent as the resolution of cathode ray tubes has increased.

Furthermore, as shown in Fig. 3, convergence is also achieved around the screen using a deflection yoke (DY), but in reality, assembly errors of the deflection yoke,
Due to variations in the packaging of the electron gun in the neck portion, variations in the attachment of the deflection yoke, etc., asymmetric misconvergence may occur in which the B beam shifts in the horizontal direction when the R and G beams are combined. 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 parabolic 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 that can solve the above problems.

[Means for solving problems]

The present invention provides an electron gun (6) having a convergence plate consisting of inner convergence plates (8a), (8b) to which an anode voltage of 11 V is applied and outer convergence plates (8c), (8d) to which a convergence voltage C is applied. ) equipped with a cathode ray tube (1
1, the convergence voltage Cv is supplied independently to the outer convergence plates (8c) and (8d) for deflecting the beams (9R) and (9B) located on both sides of the central beam (9G). It is characterized by the following.

Note that the actual deflection is determined by the inner convergence plate (8a
), (8b) and outer convergence plate (8b)
c) and (8d), but the above deflecting convergence plate refers in particular to the outer convergence plate (8c) and (8d).

[Effect]

According to the invention, the outer convergence plate (8c)
, (8d) to supply voltage independently,
Even if there are assembly errors of the electron gun (6), variations when mounting the electron gun (6), assembly errors of the deflection yoke, etc., the R beam (9R) and B beam (9B) By independently adjusting the deflection state of , it becomes possible to accurately correct misconvergence in the horizontal direction at the center of the screen and at the periphery of the screen. Also,
Since there is no need to correct horizontal misconvergence using a six-electrode magnet or the like, there is no possibility that the spot shape will be distorted as in the prior art.

〔Example〕

The present invention will be described in detail with reference to the drawings.

1 and 2 show a Trinitron (registered trademark) type cathode ray tube (1) according to this embodiment. This cathode ray tube (1)
The pipe body (2) has a panel part (3) and a funnel part (4).
and a neck part (5), and an electron gun (6) is mounted inside the neck part (5). On the stem side of this electron gun (6), there are three cathodes (7R), (7G), (7) corresponding to red (R), edge (G), and blue (B).
B) are arranged in-line, and with respect to these cathodes, a first grid G1, a common second grid G2, a third grid G], a fourth grid G4 and a fifth grid G5 are sequentially arranged coaxially; Convergence means (8) is arranged at the rear stage of the fifth grid G5. The convergence means (8) includes inner convergence sprays arranged vertically opposite each other across the axis (8a),
(8b), and an outer convergence plate (8a) and an outer convergence plate (8b) arranged on the outside of these inner convergence plates (8a) and (8b) so as to face each other across the axis.
c) and (8d). The inner convergence plates (8a) and (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 electron beams (9
A through hole is bored through which R), (9G), and (9B) pass. The third, fourth, and fifth grids G3, G4, and G5 constitute a main electron lens,
Each electron beam (9R).

After (9G) and (9B) intersect at approximately the center of the main electron lens, the R (red) beam (9R) and B (blue) beam (9B) located on both sides of the central beam (9G) diverge. . The central G (fi) beam (9G) is connected to the inner convergence plate (8a), (8b) f,
lwoJE passes directly, but the R beam (9R) and B beam on both sides
The beam (9B) is deflected between inner convergence plates (8a), (8b) and outer convergence sprays (8c), (8d), which are opposed to each other, and is again focused uniformly on the fluorescent surface. It turns out. For this deflection, the inner convergence plates (8a), (8b) have a fifth grid G
Since the free end of the conductive elastic contact piece (10) attached to the inner conductive film (11) is in contact with the inner conductive film (11), the
An anode voltage HV is supplied via a topotan (12). In contrast, the outer convergence spray) (8
c) and (8d) are connected to each plate (8c) by the convergence voltage supply means of the present invention.

(8d) independently supplies voltage. f! II. For this purpose, as shown in FIGS. 7 and 8, as an anode button, Dura glass (barium glass containing alumina powder) ( A pin (15a) made of a conductor for supplying an independent voltage to each of the outer convergence plates (8c) and (8d) by insulating them with 14).
, (15b) are provided in parallel to form an anode button (12). Also, Figure 9 and 1O
As shown in the figure, a first pin (15a) made of a conductor is insulated with Dura glass (14) inside a shell (13) made of a conductor and is used to supply voltage to one convergence plate (8C). and then this pin (
An anode button (12) is formed by forming a second pin (15b) made of a conductor for supplying voltage to the other convergence plate (8d) and insulated with Dura glass (14) inside the convergence plate (15a). can be used. Alternatively, as shown in Figure 11, a conventional anode button (12) with a single conductor pin insulated with Sierra glass inside the shell is used, and the outer convergence plate (8c), (ad) is used. It is also possible to consider a configuration in which two are provided on the left and right sides of the funnel part (4) in order to supply voltage to each of them. However, with this configuration, it is necessary to change the structure of the conventional funnel part (4), and a long high-voltage lead wire is placed around the shadow tube, resulting in electrical leakage. There is a risk. Therefore, in practice, the anode button (
12) is more suitable.

In addition, the shell (13), pin (15a), (1
For example, 426 alloy is used as the material for 5b), and the surface is treated with an oxide film (.

and 74 from this anode button (12) to each outer convergence spray) (8c), (8d).
The pressure is supplied as follows.

First, in the case of the anode button (12) shown in FIGS. 7 and 8, there are two pins (15a) formed in parallel.

(15b) and lead wires (16a), (16b
), the connector (17) has two pins (15a),
Each pin (15a), (15b) is attached to a ceramic substrate (18) provided with a through hole corresponding to (15b).
) is formed with a bent part (19) that can hold the metal piece (
20a) and (20b) are fixed with a pressing member (21).

And each outer convergence plate (8c
), (8d) lead wire (16
a) (16b) to each metal piece (20a), (20
b), and this metal piece (20a), (2
0b) through the lead wires (16a), (16
b) and the bottles (15a) and (15b). Next, in the case of the anode button (12) shown in Figure 9 and Figure 1O, two bottles (15a) and (15b) and a lead wire (16a) are coaxially formed.
).

(16b), the connector (17) is provided with a through hole (22) with sufficient clearance so as not to contact the central bin (15b), as shown in FIGS. 14 and 15. A lower metal piece (24) whose ends (23a) and (23b) are bent so as to contact the sides of the outer bin (15a), and a central pin (15b) on top of this.
The upper metal piece (27) has a bent part (19) that can hold the central pin (15b), which is fixed via a ceramic plate (26) with a through hole (25) through which the metal piece (27) can be inserted.
). Lead wires (16a) and (16b) to supply voltage to the respective outer convergence plates (8c) and (8d) are welded to the upper metal piece (27) and the lower metal piece (24), and these
The lead wire (
1(ia).

(16b) and bottle (15a), (15b)
Make an electrical connection with the In addition, when using this connector (17), the lead wires (16a) and (16b
) are connected vertically, so the funnel part (4
) must be twisted 90° in the middle so that it follows the inner surface of the

This twisted part (28) is a bottle (15a),
It is preferable to provide it within 25 mm from (15b).

Then, as shown in FIGS. 1, 2, 16, and 17, the anode button (12
) and the shield body (29) to cover the connector (17).
will be established. This shield body (29) consists of an upper member (30) and a lower member (31) that fit together, and includes a lead wire (16).
Since the twisted portion (28) when connecting a) and (16b) in the vertical direction is also placed inside this shield body (29), the lead wires (30) and (31) of both members (30) and (31) are
The protrusions (30a) in the directions (16a) and (16b)
) and (31b) are formed in advance. This shield body (29) is provided especially to prevent short circuits from occurring due to the getter material during gettering.

Then, connect both lead wires (16a) and (16b) connected to the anode button (12) to the funnel part (4).
) along the inside of the neck (5), where each outer convergence plate (8c) is
.

Connect to (8d). In addition, the lead wire (16a).

(16b) is covered with an insulating material (32), and these lead wires (16a) and (16b) are covered with an insulating material (32).
32) as well as conductive pipes (33a) and (33b)
) is inserted inside. Lead wire (16a),
(16b) each outer convergence plate (8a
), (8b) the connection means (34) shown in FIG.
As shown in FIG. 2 and FIGS. 18 to 21, the tips (35a) of the conductive pipes (33a) and (33b)
) and (35b) into a V-shape to form an electron gun (
6) so that the bead glass (36) does not hit the connecting means (34) (this V-shaped tip (35a)).

(35b) is small (also bead glass (36)
(for example, about 12 mm)
Conductive elastic contact pieces (37a), (37b) are integrally formed on the respective lead wires (16a), (16b) led out from the tip portions (35a), (35b). ),
(38b) is constructed by welding. (43)
is an insulated pipe. Then, two conductive pipes (33
7-character part (39) consisting of a) and (33b)
A support spring (41) having a bilaterally symmetrical shape is provided along which a base (40) is welded. This support spring (4
1), the lead wire (IGa), (1
6b) is provided to support and prevent its movement.

In addition, a conductive pipe (33a) is connected through the internal conductive film (11) and the support spring (41).

By applying the anode voltage HV to (33b),
Lead wire (16a) to which convergence voltage Cv is applied
) and (16b) are arranged in the funnel portion (4), it is possible to avoid disturbance of the electric field.

This support spring (41) has a conductive thin plate as its base (41).
0) can be made by punching them so that they are connected. In addition, as shown in FIG. 22, the support spring (41) is connected to each lead wire (1
It can also be formed by explosively welding a linear conductive elastic material to each of the conductive pipes (33a) and (33b) corresponding to 6a) and (16b), respectively. According to the support spring (41) according to the above-mentioned configuration, the deflection=
This has the effect that eddy currents due to the single magnetic field are less likely to occur.

〔Effect of the invention〕

According to the present invention, it is possible to independently adjust the voltage applied to each outer convergence plate in the convergence plate of the electron gun, thereby making it possible to eliminate horizontal misconvergence at the center of the screen and at the periphery of the screen. As a result, the deflection yoke only needs to consider vertical misconvergence, increasing the degree of freedom in designing the deflection yoke, and making it possible to design a deflection yoke with less spot distortion due to magnetic fields.It also corrects horizontal misconvergence. Since there is no need to use a 6-positive electrode magnet, etc., the conventional problem of deterioration of the spot shape can be solved.

[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. Figure 7 is a perspective view of the anode button, Figure 8 is a sectional view of the anode button,
9 is a perspective view of another anode button, FIG. 10 is a sectional view of another anode button, FIG. 11 is a diagram for explaining another anode button, FIG. 12 is a plan view of the connector, and FIG.
Figure 3 is a side view of the connector, Figure 14 is a side view of another connector, Figure 15 is a perspective view of another connector, Figure 16 is a side view of the shield body, and Figure 17 is an exploded perspective view of the shield body. , 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, FIG. 21 is a perspective view of the connecting means, and FIG. 22 is a view of other connecting means. FIG. (11 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) and (8b) are inside Convergence plate, (8c) and (8d) are outer convergence plates, (11) is internal conductive film,
(12) is an anode button, (15a), (1
5b) is a pin, (16a). (16b) is the lead wire, (29) is the shield body, (34
) is the connecting means, (35a), (35b) are the tips, (37a) and (37b) are the elastic contact pieces, (38a)
) and (38b) are elastic materials.

Claims (1)

[Claims] In a cathode ray tube equipped with an electron gun having convergence plates, voltages are independently supplied to the convergence plates located on both sides of a central beam for deflecting beams. A cathode ray tube characterized by: