KR0139475B1 - Electromagnetic deflection yoke for color cathode ray tube - Google Patents

Abstract

Provided is an electron deflection yoke for a color cathode ray tube that can correct both coma aberration in a vertical direction and cross wrong convergence between an R and a B beam.

The upper and lower sides of the flange 3a of the rear side electron gun side of the constituent coil bobbin 3 The magnetic cores 4a and 4b are provided. Auxiliary coils 14a and 14b for generating magnetic flux in the same direction on the upper and lower sides of the cores 4a and 4b, and auxiliary coils 15a and 15b for generating magnetic flux in the reverse direction on the upper and lower sides. Wind One end of the auxiliary coils 15a and 15b is connected to the connection points of the auxiliary coils 14a and 14b and the other end is connected to a variable resistor connected in parallel to the auxiliary coils 14a and 14b. The correction amounts according to 15a) and 15b are adjusted.

Description

Electronic deflection yoke for colored cathode ray tubes

1 is a rear view showing one embodiment of the present invention.

2 is a diagram showing the configuration of an auxiliary magnetic field generating means used in the present invention.

3 is a wiring diagram of one embodiment of the present invention.

4 is an operation explanatory diagram of the present invention.

5 (a) and 5 (b) are explanatory diagrams of the operation of the present invention.

6 shows convergence characteristics according to the present invention.

7 (a) and 7 (b) are explanatory diagrams of the operation of the present invention.

8 shows convergence characteristics according to the present invention.

9 is a diagram for explaining coma aberration.

10 is a rear view showing a conventional example.

11 is a wiring diagram of a conventional example.

12 (a) and 12 (b) are diagrams for explaining problems of the conventional example.

* Description of the symbols for the main parts of the drawings *

1: Core 2: Vertical Deflection Coil

3: coil bobbin 3a: flange part

4a, 4b: Core (magnetic material) 6: Neck part

7: vertical deflection circuit 8, 9: variable resistance

10 to 13, 16: resistance 14a, 14b: first auxiliary coil

15a, 15b: second auxiliary coil

[Industrial use]

The present invention relates to an electronic deflection yoke used in an image display apparatus using an in-line color cathode ray tube such as a television receiver, a computer terminal device, and particularly, a color cathode ray which is suitably used in a high precision image display apparatus. For conventional electronic deflection yoke.

[Prior art]

It is well known that the deflection coils used in in-line color cathode ray tubes with three electron guns in an in-line array that emit one center beam and one pair of side beams generally use self-convergence. to be. This self-convergence method is inconsistent in the magnetic field generated by the horizontal and vertical deflection coils, i.e., the horizontal deflection coil is a pin cushion magnetic field distribution, and the vertical deflection coil is a barrel magnetic field distribution. It is trying to converge.

In this state, however, the convergence of the side beams is correct, but the convergence of the center beams is coma aberration HCR, VCR in the horizontal and vertical directions as shown in FIG. 9, and is not practical.

Therefore, coma aberrations HCR and VCR can be matched by providing a magnetic body called a field controller to a part of the electron gun of the cathode ray tube and defecting the magnetic flux caused by the magnetic body and the leakage magnetic flux of the deflection coil.

By the way, the demand for high-precision display has become strong in recent years with the spread of CaD / CaM. It is well known that high-precision display requires high-speed scanning (high horizontal deflection frequency), but in cathode ray tubes equipped with field controllers, high-frequency scans increase high-frequency loss and insufficient amount of correction of the field controller at the left end of the screen. There is a problem that quality cannot be obtained.

Thus, in order to solve this problem, a so-called coma presystem that controls the field controller from the cathode ray tube and corrects the coma aberration HCR and VCR by the deflection coil itself is provided for practical use. The Coma Free System corrects the horizontal coma aberration HCR by using the electron gun side of the horizontal deflection magnetic field and the strong pin cushion magnetic field on the screen side, and the vertical coma aberration VCR is not compensated by the vertical deflection magnetic field alone. In the up and down direction of the electron gun side By arranging a magnetic magnetic body (core), a secondary coil is wound around the magnetic body, and a vertical deflection current flows to correct the coma aberration VCR.

10 is an example of a conventional electron deflection coil for color cathode ray tubes by a coma free system, which will be described below.

As shown in FIG. 10, the conventional deflection coil has a core 1, a saddle-shaped vertical deflection coil 2 disposed on an inner surface of the core 1, and a conical coil bobbin on an inner surface of the vertical deflection coil 2. The saddle-shaped horizontal deflection coil (not shown) disposed through the coil bobbin (3) and the flange portion 3a on the electron gun side of the coil bobbin 3 are mounted on the neck portion 6 of the cathode ray tube. It is placed up and down and installed with three electron guns of R (Red), G (Green) and B (Blue). Shaped cores 4a and 4b, Auxiliary coils 5a and 5b wound around the central portions of the magnetic cores 4a and 4b are provided. These cores 4a, 4b and auxiliary coils 5a, 5b operate as auxiliary magnetic field generating means.

In addition, these vertical deflection coils 2, auxiliary coils 5a and 5b are connected as shown in FIG. That is, the vertical deflection coils 2, 2 are connected to the vertical deflection circuit 7 so that a vertical deflection current flows, and the connection points of the vertical deflection coils 2, 2 are vertical cathode ray tubes 2, ( The auxiliary coils 5a and 5b are connected to a vertical deflection circuit 7 connected in series with the vertical deflection coil 2 and connected to the variable resistor 8 connected in parallel with 2). The connection point of these auxiliary coils 5a and 5b is connected to the variable resistor 9. In Fig. 11, the resistors 10 and 11 connected in series with the variable resistor 8 and the resistors 12 and 13 connected in series with the variable resistor 9 are currents connected as necessary. It is a limiting resistor.

The variable resistor 8 is a regulator for optimally correcting a false convergence Yv in which the R and B beams are displaced with respect to the G beam shown in FIG. 12 (b), and the variable resistor 9 is shown in FIG. 12 (a). A regulator for optimally correcting the false convergence Vs intersected by the (R) beam and the (B) beam shown in Figs. 1 and 2 is mainly provided to absorb manufacturing unevenness of the cathode ray tube and the deflection coil.

[Problems to Solve Invention]

However, in the above-described conventional deflection yoke, if the wrong convergence Vs is adjusted by the variable resistor 9, the amount of correction of the coma aberration VCR in the vertical direction is lowered, and conversely, the problem of the coma aberration VCR is problematic. There was a problem that if the level was maintained at a level that was not maintained, sufficient correction amount of false convergence (Vs) could not be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an electron deflection yoke for a color cathode ray tube that can correct both coma aberration in a vertical direction and cross wrong convergence of an R beam and a B beam.

[Means for solving the problem]

The present invention relates to a rear electron gun side of the deflection yoke in an electron deflection yoke for a color cathode ray tube mounted on an in-line color cathode ray tube having three electron guns in an in-line array in order to solve the problems of the prior art described above. The upper and lower sides arranged perpendicularly to the arrangement direction of the A first magnetic coil connected in series and a first auxiliary coil connected in series with the upper and lower magnetic bodies and all or part of a vertical deflection current flows to generate magnetic flux in the same direction on the upper side and the lower side; A variable resistor having both ends connected in series to a second auxiliary coil connected in series to the magnetic body and having a portion of the vertical deflection current flowing therein to generate a reverse magnetic flux on the upper side and the lower side; And one end of the second auxiliary coil connected in series to the connection point of the first auxiliary coil connected in series, and the other end of the second auxiliary coil connected to the midpoint of the variable resistor. An electron deflection yoke for color cathode ray tubes is provided.

EXAMPLE

EMBODIMENT OF THE INVENTION Hereinafter, the electron deflection yoke for color cathode ray tubes of this invention is demonstrated with reference to an accompanying drawing. 1 is a rear view showing an embodiment of an electron deflection yoke for a color cathode ray tube of the present invention, and FIG. 2 is a view showing a configuration of an auxiliary magnetic field generating means used in the electron deflection yoke for a color cathode ray tube of the present invention. Fig. 4 is a wiring diagram of one embodiment of the electron deflection yoke for color cathode ray tube of the present invention, Figs. 4, 5, and 7 are explanatory views of operations of the electron deflection yoke for color cathode ray tube of the present invention. It is a figure which shows the convergence characteristic by the color cathode ray tube electron deflection yoke of. In Fig. 1, the same parts as in Fig. 10 are denoted by the same reference numerals.

First, the schematic structure of the deflection yoke of this invention is demonstrated. As shown in FIG. 1, the deflection yoke of the present invention has a core 1, a saddle-shaped vertical deflection coil 2 disposed on the inner surface of the core 1, and a conical coil on the inner surface of the vertical deflection coil 2. The saddle-shaped horizontal deflection coil (not shown) disposed through the bobbin 3 and the flange portion 3a on the electron gun side of the coil bobbin 3 are disposed above and below the neck portion 6 of the cathode ray tube ( R), (G), (B) three guns installed like The magnetic cores 4a and 4b are provided, and in the present invention, the first auxiliary coils 14a, 14b and the second auxiliary coils are disposed at approximately the center of the cores 4a and 4b. (15a) and (15b) are wound up.

These first and second auxiliary coils 14a, 14b, 15a, and 15b are wound around the cores 4a and 4b, for example, as shown in FIG. That is, the 2nd auxiliary coil 15a (15b) is wound around core 4a (4b), and the 1st auxiliary coil 14a (14b) is wound from it. Here, the first auxiliary coils 14a and 14b are wound up and down in the same direction, that is, the magnetic flux in the same direction is generated in the auxiliary coil 14a on the upper side and the auxiliary coil 14b on the lower side and the second auxiliary coil The coils 15a and 15b are wound upside down, i.e., reverse magnetic flux is generated around the auxiliary coil 15a on the upper side and the auxiliary coil 15b on the lower side. Of course, in addition to this embodiment, the second auxiliary coil 15a (15b) is wound from above the first auxiliary coil 14a (14b) or the first auxiliary coil 14a (14b) and the second auxiliary coil 15a (15b) are wound. You may wind in parallel from side to side.

Thus, these cores 4a, 4b and the first and second auxiliary coils 14a, 14b, 15a, and 15b operate as auxiliary magnetic field generating means.

In the present invention, the vertical deflection coils 2, the first and second auxiliary coils 14a, 14b, 15a, and 15b are connected as shown in FIG. That is, the vertical deflection coils 2, 2 are connected to the vertical deflection circuit 7 so that a vertical deflection current flows, and the connection points of the vertical deflection coils 2, 2 are vertical deflection coils 2, ( It is connected to the variable resistor 8 connected in parallel with 2). The first auxiliary coils 14a and 14b are connected in series with the vertical deflection coil 2 and connected to the vertical deflection circuit 7. Further, the connection points of the first auxiliary coils 14a and 14b are connected to the series circuits of the second auxiliary coils 15a and 15b via the resistor 16, and the second auxiliary coils 15a are connected. One end of is connected to the variable resistor 9 to form a bridge circuit. In addition, the resistors 10, 11 connected in series with the resistor 16, the variable resistor 8, and the resistors 12, 11 connected in series with the variable resistor 9 are connected as necessary. Resistance for current limiting.

Next, the operation of the deflection yoke of the present invention will be described.

As described above, since the first and second auxiliary coils 14a, 14b, 15a, and 15b are connected in series to the vertical deflection circuit 7, the first and second auxiliary coils 14a, 14b, 15a, and 15b are substantially the same as or part of the vertical deflection current. Current flows First, consider the case where the midpoint of the variable resistor 9 is always at the center. At this time, since the same amount of current flows through the first auxiliary coils 14a and 14b, and no current flows through the second auxiliary coils 15a and 15b, as shown in FIG. Vertical lines symmetrical magnetic lines Φ1 and Φ2 are generated by (14a) and (14b). This magnetic flux acts particularly strongly on the G beam, which is the center beam, and as a result, corrects only the screen aberration VCR in the vertical direction. In FIG. 4, the solid arrow indicates the magnetic flux when the electron beam is deflected downward from the center of the screen in the vertical direction. The solid arrow attached to the electron beams R, G, and B indicates that the electron beam is perpendicular to the screen. The dotted line arrow indicates the direction of the force received when the direction is deflected upward from the center, and the dotted line arrow indicates the direction of the force received when the electron beam is deflected downward from the vertical center of the screen.

When the midpoint of the variable resistor 9 is on the a side, the current flowing through the first auxiliary coils 14a and 14b becomes the current flowing through the current auxiliary coil 14b flowing through the auxiliary coil 14a. The magnetic flux generated by the second auxiliary coils 15a and 15b is shown in FIG. 5 (a), and the magnetic flux generated by the second auxiliary coils 15a and 15b is represented by As shown in Fig. 5 (a). Therefore, the magnetic flux generated by the auxiliary magnetic field generating means according to the present invention is a magnetic flux obtained by combining the magnetic flux shown in FIG. 5 (a) and the magnetic flux shown in FIG. 5 (b). In addition, in FIG. 5, the solid line volcano table indicates magnetic flux when the electron beam is deflected upward in the vertical direction of the screen, and the dotted arrow indicates the magnetic flux when the electron beam is deflected downward from the vertical direction of the screen. The solid arrows attached to the electron beams R, G, and B indicate the direction of the force received when the electron beam is deflected upward from the vertical center of the screen, and the dotted arrow indicates the electron beam downwards from the vertical center of the screen. The direction of the force received when deflecting is shown.

At this time, the R beam and the B beam are incorrect due to the magnetic flux obtained by combining the magnetic flux generated by the first auxiliary coils 14a and 14b with the magnetic flux generated by the second auxiliary coils 15a and 15b. The state of convergence is as shown in FIG.

When the midpoint of the variable resistor 9 is on the B side, the current flowing through the first auxiliary coils 14a and 14b becomes the current flowing through the current auxiliary coil 14b flowing through the auxiliary coil 14a. In the second auxiliary coils 15a and 15b, the reverse current flows when the midpoint of the variable resistor 9 is on the (a) side. As a result, the magnetic flux generated by the first auxiliary coils 14a and 14b is as shown in FIG. 7 (a), and the magnetic flux generated by the second auxiliary coils 15a and 15b is As shown in FIG. 7 (b). Therefore, the magnetic flux generated by the auxiliary magnetic field generating means according to the present invention is a magnetic flux obtained by combining the magnetic flux shown in Fig. 7 (a) and the magnetic flux shown in Fig. 7 (b). In addition, in Fig. 7, the solid line arrow indicates the magnetic flux when the electron beam is deflected upward from the center of the screen in the vertical direction, and the dotted line arrow indicates the magnetic flux when the electron beam is deflected upward from the center in the vertical direction of the screen. The dotted line arrow indicates the magnetic flux when the electron beam is deflected downward from the vertical center of the screen, and the solid arrows attached to the electron beams R, G, and B indicate that the electron beam is upward from the vertical center of the screen. The direction of the force received when deflecting to the side and the dotted line arrow indicates the direction of force received when the electron beam is deflected downward from the center of the vertical direction of the screen.

At this time, the R beam and the B beam are incorrect due to the magnetic flux obtained by combining the magnetic flux generated by the first auxiliary coils 14a and 14b and the magnetic flux generated by the second auxiliary coils 15a and 15b. The state of convergence is as shown in FIG.

Accordingly, in the deflection yoke of the present invention, the coma aberration VCR in the vertical direction can be corrected by the first auxiliary coils 14a and 14b, and the twelfth (a) is also adjusted by adjusting the variable resistance 9 at the same time. It is possible to adjust the wrong convergence Vs of the cross between the R beam and the B beam shown in the optimum state. Of course, at this time, even if the wrong convergence Vs is adjusted, the correction amount of the coma aberration VCR does not decrease, and both the coma aberration VCR and the wrong convergence VS can be corrected well.

In addition, in the deflection yoke of the present embodiment described above, the so-called saddle saddle deflection yoke, in which both the horizontal deflection coil and the vertical deflection coil 2 are saddle-shaped (saddle winding), has been described. It is good also as what is called a saddle-toroidal type deflection yoke which made the saddle winding and wound the vertical deflection coil 2 into a toroidal winding.

Moreover, although the 1st auxiliary coil 14a, 14b and the 2nd auxiliary coil 15a, 15b are wound on the same core 4a, 4b, even if a plurality of cores are provided and wound on another core, do.

The present invention is not limited to the present embodiment and can be modified in various ways without departing from the gist of the present invention.

[Effects of the Invention]

As described above in detail, the electron deflection yoke for the color cathode ray tube of the present invention Auxiliary magnetic field generating means by winding a first auxiliary coil connected in series to generate a reverse magnetic flux from the upper side and a lower side to a magnetic magnetic body and a second auxiliary coil connected in series to generate a reverse magnetic flux to the upper side and the lower side And one end of the second auxiliary coil to the connection point of the first auxiliary coil and the other end to the variable resistor to adjust the correction amount by the second auxiliary coil so that the R beam and the B beam and By adjusting the cross misconvergence of, the correction of the coma aberration does not degrade even if the cross misconvergence between the R and B beams is adjusted, and both the coma aberration and the cross wrong convergence of the cross can be corrected well. .

Claims (1)

In an electron deflection yoke for a color cathode ray tube mounted on an inline colored cathode ray tube with three electron guns in a one line arrangement, The upper side and the lower side of the deflection yoke are arranged in the vertical direction so as to be orthogonal to the rear direction of the electron gun. Shaped cores 4 and 4b, The first auxiliary coils 14a and 14b connected in series are wound around the upper and lower cores 4a and 4b so that all or part of the vertical deflection current flows to generate magnetic flux in the same direction to the upper and lower sides. and, A second auxiliary coil 15a, 15b connected in series, wound around the upper and lower cores 4a, 4b and having a portion of the vertical deflection current flowing to generate reverse magnetic flux in the upper side and the lower side; A variable resistor 9 connected at both ends in parallel to the first auxiliary coils 14a and 14b connected in series; While connecting one end of the second auxiliary coils 15a and 15b connected in series to the connection point of the first auxiliary coils 14a and 14b connected in series, An electronic deflection yoke for a color cathode ray tube, characterized in that the other end of the second auxiliary coils (15a, 15b) is connected to the midpoint of the variable bottom (8).