JPH03225734A - Deflection yoke device for color picture tube - Google Patents

Abstract

PURPOSE:To surely correct misconvergence on both the left and right sides of a picture plane by facedly arranging a pair of correction coils at the upper and lower parts on the neck part side of a coil bobbin to electrify positive and negative horizontal deflection currents. CONSTITUTION:When a horizontal deflection current is positive and swung to the left side of a picture plane, a deflection current flows in first and second correction coils 7B and 8B via a diode. Consequently a correction magnetic field toward from top to bottom is generaged on the right side leg parts of E-shaped cores 7A and 7B, and that toward from bottom to top is generated on the middle leg part to deflect a blue beam B to the right side and a green beam G to the left side to conform electron beams R, G, and B in the left and right direction. Also when a horizontal deflection current is negative, similary the red beam R is deflected to the left side and the green beam G to the right side to conform the electron beams in the left and right direction. This permits sure correction of misconvergence on the left and right sides of a picture plane even a horizontal deflection magnetic field is made a barrel magnetic field over from a neck part to a belly part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deflection yoke device for a color picture tube, which is attached to a color picture tube of, for example, a color television receiver, a color display device, or the like.

[Conventional technology]

Generally, a color picture tube is equipped with a deflection yoke device in its neck, and includes blue (B), red (R), green (G)
) are deflected to focus them on one point on the screen. Therefore, this type of deflection yoke device consists of a coil bobbin attached to the neck of the color picture tube, and a horizontal deflection coil and a vertical deflection coil provided on the coil bobbin, and the horizontal deflection magnetic field due to the horizontal deflection coil is The misconvergence can theoretically be made zero by configuring the vertical deflection magnetic field by the vertical deflection coil to become a barrel magnetic field.

However, in reality, it is difficult to obtain the theoretical characteristics due to the structure of the color picture tube, the structure of the deflection yoke device, etc.
In reality, various types of misconvergence occur, and various measures have been taken to correct these miscomparisons.

In particular, compared to conventional deflection yoke devices, it is essential for a deflection yoke device used for high-definition, clear vision, etc. to have good focus in order to obtain a high-definition screen. For this reason, in the deflection yoke device used for Hi-Vigilon, Clear Vision, etc., the horizontal deflection magnetic field from the horizontal deflection coil is applied from the neck part to the abdominal part (middle part) of the horizontal deflection coil, weakening the binction magnetic field and making it tend to be a barrel magnetic field. This is the most commonly used countermeasure.

[Problems to be Solved by the Invention] In this way, by making the horizontal deflection magnetic field tend to be a barrel magnetic field from the neck to the abdomen, a screen with good focus as a whole can be obtained.
Horizontal misconvergence XM at the right measuring point
has an amplification tendency (amplification means that the red beam is closer to the left side of the screen than the blue beam), and the left on the X axis,
Horizontal misconvergence H between the center of blue (B)/red (R) and green (G) at the right measurement point
CR (Horizontal Center Ra5t
er) becomes wide. As a result, the overall screen characteristics are as shown in Figure 7, and the amplitudes of red (R), blue (B), and green (G) are as follows: R amplitude = B amplitude <G amplitude... There is an unresolved problem of (1).

The present invention was made in view of such unresolved problems in the prior art.When the horizontal deflection magnetic field has a barrel magnetic field tendency from the neck to the abdomen, xM is the amplifier, H
It is an object of the present invention to provide a deflection yoke device that can simultaneously correct misconvergence that would result in a wide CR.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a coil bobbin attached to the neck of a color picture tube, and a magnetic field provided on the coil bobbin to deflect an electron beam output from the neck of the color picture tube. In a deflection yoke device for a color picture tube comprising a horizontal deflection coil and a vertical deflection coil, a pair of correction coil devices are provided at upper and lower positions on the neck side of the coil bobbin, and each correction coil device is arranged at the upper and lower positions. The first one is arranged opposite to the other. Second E
a first E-shaped core, and a first E-shaped core wound around the first E-shaped core. a third correction coil; The second correction coil is wound around the second E-shaped core so as to face the third correction coil above and below.
a fourth correction coil; The second correction coil is connected to the horizontal deflection coil via a diode that allows only one of the positive and negative horizontal deflection currents to flow. The fourth correction coil is characterized in that it is connected to the horizontal deflection coil via a diode that allows only the flow of the other of the positive and negative horizontal deflection currents.

[Effect]

With this configuration, when the horizontal deflection current consisting of a sawtooth wave is either positive or negative, the opposing first . The second correction coil is energized to generate a correction magnetic field, correcting the misconvergence X, HCR so that the three electron beams R, G, and B coincide at the left and right measurement points on the X axis, and When the horizontal deflection current is in the other of positive and negative, the opposing third. A fourth correction coil is energized to generate a correction magnetic field to correct the three electron beams so that they coincide.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 6.

In the drawings, reference numeral 1 denotes a coil bobbin made of a resin material, and the coil bobbin 1 has an enlarged diameter portion IA having an enlarged diameter in the shape of a morning glory;
It is comprised of a front end enlarged part IB and a rear end enlarged part IC formed before and after the enlarged diameter part IA, and a tightening part ID extending axially rearward from the rear end enlarged part IC. The coil bobbin 1 is inserted into the neck portion of the color picture tube 2 and fixed to the neck portion 2A via a tightening band 3 provided at the tightening portion ID. Here, the color picture tube 2
An electron gun (not shown) that outputs red (R), green (G), and blue (B) electron beams is arranged in-line in the neck portion 2A.

4.4 is a pair of saddle-shaped horizontal deflection coils provided on the inner circumferential side of the coil bobbin 1, and the multi-horizontal deflection coils 4 include:
3. In order to deflect the electron beam in the horizontal direction, a horizontal deflection magnetic field is generated as a binkushing magnetic field having a barrel magnetic field tendency from the neck portion to the abdomen (axially intermediate portion). On the other hand, 5 is the enlarged diameter portion I of the coil bobbin 1.
An annular core attached to the outer periphery of A, 6, 6 are vertical deflection coils wound toroidally around the core 6, and each vertical deflection coil 6 has a vertical deflection coil in order to deflect three electron beams in the vertical direction. The magnetic field is generated as a barrel magnetic field.

Reference numeral 7.8 denotes a first and second correction coil device located on the back side of the enlarged rear end portion 1C of the coil bobbin l and disposed facing each other upwardly and downwardly. and a first wire wound around each winding portion of the E-shaped core 7A.
．． The second correction coil device 8 is also composed of third correction coils 7B and 7C, and the second correction coil device 8 includes a second E-shaped core 8A and a second correction coil device 8 wound around each winding portion of the E-shaped core 8A. It is composed of fourth correction coils 8B and 8C. When the correction coil devices 7.8 are disposed facing each other at the top and bottom, the first. The second correction coils 7B and 8B face each other upwardly and downwardly on the right side of the figure, and the third correction coil 7B and 8B face each other upwardly and downwardly on the right side of the figure. Fourth correction coils 7C and 8C are arranged to face each other upwardly and downwardly on the left side of the figure. In addition, each E-shaped core 7A,
8A is the core locking piece IE provided on the back of the rear end enlarged part IC.
.

It is installed in IE,...

Further, as shown in FIG. 4, the first correction coil 7B and the second correction coil 8B are connected in series with a diode 9 that allows only a positive horizontal deflection current to flow from the hot side to the cold side. The third correction coil 7C and the fourth correction coil 8C are connected in series with a diode 10 that allows only a negative horizontal deflection current to flow from the cold side to the hot side. These series connections are arranged in parallel between the connection points 11 and 12, with the connection point 11 being connected to the hot terminal via the horizontal deflection coil 4.4, and the connection point 12 being connected to the cold terminal.

The present embodiment is configured as described above, and next, the correction operation by the correction coil device 7.8 will be described.

First, as shown in FIG. 5(A) (when the horizontal deflection current is a positive deflection current 13 and swings to the left side of the screen, it is actually the first half A of the scanning period, and at this time the diode The horizontal deflection current 13 flows through the first and second correction coils 7B and 8B through the coils 9. As a result, as shown in FIG.
As shown in b), a correction magnetic field B directed from top to bottom is generated in the left leg between the E-shaped cores 7A and 7B between the correction coil devices 7 and 8, and the blue beam B is The green beam G is deflected to the left by a force indicated by F2, and a correction magnetic field B2 directed from bottom to top is generated in the central leg between the E-shaped cores 7A and 7B, causing the green beam G to be deflected to the right by a force indicated by F2.

As a result, the left side screen characteristics shown in FIG. 7 are as shown in FIG.
They now match in the right direction, and misconvergence where XM becomes an amplifier and HCR becomes wide can be corrected at the same time.

Next, as shown in FIG. 6(a), when the horizontal deflection current is a negative deflection current 13' and is swung to the right side of the screen, it is actually the second half B of the scanning period, and at this time are connected to the third and fourth correction coils 7C via the diode IO,
The horizontal deflection current 13' flows through 8C. This results in
As shown in FIG. 6(B), between the correction coil devices 7 and 8, the right leg of the E-shaped cores 7A and 7B has a direction (
A correction magnetic field B3 is generated to deflect the red beam R to the right side by the force shown in F3, and a correction magnetic field B4 directed from top to bottom is generated in the central leg between the E-shaped cores 7A and 7B.
The green beam G is deflected to the left by the force shown at F4. As a result, the right side screen characteristics shown in Fig. 7 are as shown in Fig. 6 (
As shown in c), each electron beam (R), (G), (B)
now match in the left and right directions, X2 is the amplifier, H
Misconvergence with wide CR can be corrected at the same time.

(Thus, in this embodiment, in order to improve the focus on the screen, if the horizontal deflection magnetic field is made to have a barrel magnetic field tendency from the neck to the abdomen,

However, by using the pair of correction coil devices 7.8 according to this embodiment, these two types of misconvergence can be corrected at the same time.

In the embodiment, the horizontal deflection current 13 which is positive in the first half A of the scanning period is used, and the horizontal deflection current 13' which is negative in the second half B of the scanning period is used. A horizontal deflection current in which the first half A is negative and the second half B is positive may be used; in this case, the diodes 9 and 10 may be installed in reverse.

Further, the E-shaped core 7A8A of the correction coil device 7.8 may be formed into an E-shape by combining U-shaped cores.

Furthermore, the first. Second correction coils 7B, 8B, third . Although the fourth correction coils 7C and 8C have been described as being connected in series, they may also be connected in parallel to the diode 9.degree. 10.

[Effects of the Invention] The deflection yoke device according to the present invention is as described in detail above, and includes a pair of correction coil devices disposed facing each other at the top and bottom on the neck side of the coil bobbin.

Due to the negative horizontal deflection current, in the first half and the second half of the scanning period on both the left and right sides of the screen, Even if the horizontal deflection magnetic field is made to have a barrel magnetic field tendency from the neck to the abdomen in order to correspond to the screen, misconvergence on both the left and right sides of the screen can be reliably corrected.

[Brief explanation of drawings]

1 to 6 relate to embodiments of the present invention, in which FIG. 1 is a side external view of the deflection yoke device, FIG. 2 is a right side view of FIG. 1, and FIG. -■ An enlarged cross-sectional view of the main part viewed from the direction of the arrow, Figure 4 is a circuit diagram showing the connection relationship between the correction coil and the horizontal deflection coil, Figure 5 shows the correction operation on the left side of the screen, and Figure 5 (A) is an explanatory diagram showing a positive horizontal deflection current, and FIG. An explanatory diagram showing the state in which the left side of the screen is corrected by the third correction coil, Fig. 5 (C) is an explanatory diagram showing the state after correction of the left side of the screen, and Fig. 6 shows the correction operation on the right side of the screen. 6(a) is an explanatory diagram showing a negative horizontal deflection current, and FIG. 6(b) is an explanatory diagram showing the negative horizontal deflection current. An explanatory diagram showing a state in which the right side of the screen is corrected by the fourth correction coil,
FIG. 6 (c) is an explanatory diagram showing the state of the right side of the screen after correction;
FIG. 7 is an explanatory diagram showing an aspect of misconvergence occurring in a conventional deflection yoke device. 1... Coil bobbin, 2... Color picture tube, 4...
・Horizontal deflection coil, 6...Vertical deflection coil, 7, 8・
...Correction coil device? A, 8A...E-shaped core, 7
B. 8B, 7G, 8C... 1st. Second. Third. Fourth correction coil, 9.10...diode.

Claims (1)

[Claims] A collar consisting of a coil bobbin that is attached to the neck of a color picture tube, and a horizontal deflection coil and a vertical deflection coil that are provided on the coil bobbin and generate a magnetic field that deflects an electron beam output from the neck of the color picture tube. In the deflection yoke device for a picture tube, a pair of correction coil devices are provided at upper and lower positions on the neck side of the coil bobbin, and each correction coil device has first and second correction coil devices disposed facing each other in the upper and lower positions. an E-shaped core, first and third correction coils wound around the first E-shaped core, and a second correction coil facing above and below the first and third correction coils. and second and fourth correction coils wound around the E-shaped core of the first correction coil.
, the second correction coil is connected to the horizontal deflection coil via a diode that allows only one of the positive and negative horizontal deflection currents to flow, and the third and fourth correction coils are connected to the horizontal deflection coil that allows only one of the positive and negative horizontal deflection currents to flow. A deflection yoke device for a color picture tube, characterized in that the deflection yoke device for a color picture tube is connected to the horizontal deflection coil via a diode that allows only the flow of the other horizontal deflection current.