JPH0376394A - Color deflection yoke device - Google Patents

Abstract

PURPOSE:To highly precisely correct misconvergence by constituting a full wave rectifier circuit of inductance elements and a pair of diodes and changing an inductance division position. CONSTITUTION:When a correction current which the full wave rectification circuit 6 generates flows in correction coils 5a and 5b, a correction magnetic filed Bs from a top-side toward a bottom-side is generated on the beam-side of blue B. The beam of blue B moves to a left direction by the correction magnetic field, an the beam of red R moves to a right direction. Consequently, the beams of blue B and red R move to the direction of the pattern of an over type, and the misconvergence of an under type is corrected. The sizes of the inductances L1 and L2 are changed and the sizes of i1 and i2 can arbitrarily be adjusted by retrogressively adjusting the core of a differential coil 8. Consequently, the parabolic current waveform of an ideal waveform, which is bilaterally balanced, can be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color deflection yoke device equipped with means for correcting misconvergence in the horizontal direction on the X-axis of the screen of a cathode ray tube.

[Conventional technology]

In recent years, cathode ray tube screens (hereinafter referred to as television screens) in color television receivers and color display devices have become increasingly popular.
There is a trend toward higher resolution and larger size, and with this, the beam drive becomes wide-angle deflection, and in order to improve focus characteristics, there is a tendency to make the magnetic field distribution of the horizontal deflection coil more linear. However, if the magnetic field distribution of the horizontal deflection coil is made linear, color misalignment between the blue B beam and the red R beam on the
M appears, and it is desired to make this correction.

In order to correct this misconvergence XH,
In a cathode ray tube in which a blue B electron gun GIl, a green G electron gun Gc, and a red R electron gun GR are arranged in-line from left to right when viewed from the screen side, the blue B beam and the red R beam are vertically arranged. It is known that a pair of correction coils are connected to a horizontal deflection coil so that correction magnetic fields across the beam are generated in opposite directions, and a parabolic current synchronized with the horizontal deflection pulse is passed through the correction coil. ing.

Possible means for generating this parabolic current include one that utilizes the resonance of a resonant circuit, or one that connects four saturable coils to a bridge and uses this bridge circuit to generate the parabolic current.

However, the method that uses the resonance of the resonant circuit has the problem that an appropriate parabolic current cannot be obtained due to the distortion of both ends of the waveform, and the method that uses the bridge circuit of a saturable coil has a balance between the left and right sides. There are problems in that it is difficult to obtain a well-defined waveform, and in addition, the sensitivity of correction is generally poor.

To solve this problem, as shown in Fig. 7, a diode bridge circuit consisting of four diodes 1a-1d, a sensitivity adjustment coil 2, and a balance adjustment coil 3 generates a parabolic current. This circuit was proposed in Utility Application No. 1-31698. This proposed device generates a parabolic current by full-wave rectifying the horizontal deflection current from the horizontal deflection coil 4 using the diode bridge circuit, and this parabolic current is sent to the correction coil connected to the output end side of the diode bridge circuit. 5a and 5b to correct misconvergence Xll.

[Problem to be solved by the invention]

According to the proposed device, it is possible to create a current with an ideal parabolic waveform, and it is possible to perform a high degree of convergence correction using this parabolic current with an ideal waveform. Since this proposed device requires four diodes la to Id and coils 2 and 3,
It is desirable to develop a collar deflection yoke device that has a relatively large number of parts and has a simplified parabolic current generation means that has fewer parts.

The present invention has been made to solve the above-mentioned problems, and its object is to provide a collar deflection yoke device that has a smaller number of parts and is equipped with a simpler parabolic current generating means.

[Means to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention includes a full-wave rectifier circuit that is connected to the horizontal deflection coil of a color deflection yoke and generates a parabolic current by full-wave rectifying the horizontal deflection current; a correction coil that generates a four-pole correction magnetic field for correcting misconvergence in the horizontal direction; The correction coil includes a diode and an inductance element connected between the anodes of the pair of diodes, and one end of the correction coil is connected to the cathode of the pair of diodes, and the other end is connected to the inductance element. , and one anode side of the pair of diodes is connected to the horizontal deflection coil together with one end side of the inductance element.

[Effect]

In the present invention, when driving the collar deflection yoke, a horizontal deflection voltage is applied to the full-wave rectifier circuit, and on the positive side of this horizontal deflection voltage, that is, in the retrace period, the diode connected to the horizontal deflection coil side is is turned on, producing a downward-sloping current that has a peak value on the positive side at the start position of the scan period and becomes 0 at approximately the middle position of the scan period.On the other hand, the diode on the other side is in the forward direction during the scan period, 0 at the start position of the scanning period, and creates an upward-sloping current with a peak value on the positive side at the end position of the scanning period.The sum of the currents produced by these two diodes becomes the correction current. In this correction current, the peak value at the start position of the scanning period created by the diode connected to the horizontal deflection coil side and the peak value at the end point position of the scanning period created by other diodes are on the peak side, The parabolic current waveform has a valley side at the center between scans 11JI and 11JI.

In the present invention, by changing the inductance division position of the inductance element, the proportion of horizontal deflection current flowing through each diode changes, making it possible to adjust the peak value of the correction current at the starting point and ending point of the scanning period. . By adjusting this peak value, a correction current with an ideal parabolic waveform that is bilaterally symmetrical is created.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a circuit diagram of essential parts of a collar deflection yoke device according to the present invention. The collar deflection yoke has a saddle-shaped horizontal deflection coil and a saddle-shaped or toroidal-shaped vertical deflection coil.The structure of the collar deflection yoke, which combines the horizontal deflection coil and the vertical deflection coil, is well known, so we will discuss it here. Explanation will be omitted.

In FIG. 1, horizontal deflection coils 4 disposed on the top and bottom sides of the collar deflection yoke are connected in parallel, and a full-wave rectifier circuit 6 is connected to the output side of the horizontal deflection coils 4.

This full-wave rectifier circuit 6 includes a pair of diodes 7a.

7b, and a differential coil 8 as an inductance element. The anode side of the diode 7a and one end side of the differential coil 8 are commonly connected to the horizontal deflection coil 4,
The other end of the differential coil 8 is connected to the anode side of the diode 7b. The cathodes of the diodes 7a and 7b are connected to one end of the series connection body of the correction coils 5a and 5b. The other end of this series connection body is connected to the inductance dividing portion P of the differential coil 8, approximately at the center of the differential coil 8 in this embodiment.

As shown in FIG. 2, the correction coils 5a, 5b are constructed by winding wires around U-shaped cores 10a, 1Ob. They are arranged facing each other on the left and right sides.

In this embodiment, when a correction current flows through the correction coils 5a and 5b, a correction magnetic field B that crosses the blue B beam,
The polarity of the windings of the correction coils 5a and 5b is determined so that the correction magnetic field B, which crosses the red R beam, goes from the top side to the bottom side and goes from the bottom side to the top side.

The present embodiment is configured as described above, and its operation will be explained below. When the collar deflection yoke is in operation, a horizontal deflection voltage as shown in FIG. 3(a) is generated in the horizontal deflection coil 4, and this voltage is applied to the full-wave rectifier circuit 6. Then, as shown in FIG. 6B, the diode 7a is turned on at the starting point t on the positive side of the horizontal deflection voltage, that is, during the retrace period, and the diode 7a is turned on at the starting point t of the retrace period. becomes 0, and the wave height value becomes i at the end point position tl.
A current of □ flows. At the end position of this flyback period, the diode 7a is turned off, and by turning off the diode 7a, the correction coil 5a is turned off.

As a result of the current flowing through the correction coils 5a and 5b to maintain the current, that is, to prevent the current from decreasing, the current rises to O at approximately the midpoint of the scanning period from the peak value 11. A falling current is generated. That is, a current f+ having a waveform as shown in FIG. 3(b) flows from the diode 7a side to the correction coils 5a and 5b.

On the other hand, during the scanning period, the diode 7b side is in the forward direction, so the diode 7b is in the scanning period! It turns on at the starting position t8 during the scanning period, becomes 0 at the position t8, and reaches the peak value ixz at the end position t8 of the scanning period, as shown in FIG.
A current i flows, and this current i! is the correction coil 5a
, 5b.

In other words, during the scanning period, as shown in FIG. 3(d), the sum of the currents iI and 12 is
In other words, the diode 7a
, 7b, the horizontal deflection current changes from the horizontal deflection current to Fig. 3 (d
) is generated, and this correction current is applied to the correction coils 5a, 5b. Generally, when the terminal of the correction coil 5b is connected to the center of the differential coil 8, the peak value i□ tends to be larger than inz, as shown in FIG. 3(d). As described above, when the parabolic waveform of the correction current is unbalanced on the left and right sides, a problem arises in that misconvergence X and l cannot be corrected appropriately.

In order to correct such parabola and waveform imbalance, in this embodiment, a differential coil 8 is provided, and the inductance on the diode 7a side and the inductance L2 on the diode 7b side are set at the inductance division 1 part P as a boundary.
It is possible to change the value of . That is, if L is made smaller and L2 is made larger, i becomes smaller, and 12
becomes larger. Conversely, if we increase Ll and decrease L, then 11 will increase and i will decrease.0Usually, L,=
In the case of L2, i is larger than 12.

As mentioned above, for example, by adjusting the core of the differential coil 8 forward or backward, the magnitudes of the inductances L and L2 can be changed. and the magnitude of h, that is, the wave height value i□ and 11
It is now possible to arbitrarily adjust the magnitude of 4z, and this makes it possible to create an ideal parabolic current waveform with a well-balanced left and right waveform, as shown in Figure 3(e), where i□ and fHx are equal. becomes.

Next, misconvergence X using this parabolic current
Correction of H will be explained.

When the correction current generated by the full-wave rectifier circuit 6 flows through the correction coils 5a and 5b, a correction magnetic field B is generated on the blue B beam side from the top side to the bottom side, as shown in FIG. , a correction magnetic field B directed from the bottom side to the top side is generated on the red R beam side. Due to this correction magnetic field, the blue B beam receives a force to the left when viewed from the TV screen and moves in that direction, and the red R beam receives a force to the right and moves in that direction.As a result, the blue The B beam and the red R beam move in the direction of an over-type pattern (a method in which blue B and red R are shifted in the same direction as the color arrangement direction of the electron gun) shown in Fig. 6(a). , Figure 6 shows the opposite pattern (
Under type misconvergence X1 shown in b)
1 correction is performed.

In this case, if the polarities of the correction coils 5a and 5b are connected in opposite directions, the direction of the correction magnetic field Bs will be reversed, and the moving directions of the blue B beam and the red R beam will be opposite to the above case. Correction of overtype misconvergence X11 as shown in FIG. 6(a) is achieved.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various ways.

For example, in the above embodiment, the correction coils 5a and 5b are
As shown in the figure, the collar deflection yoke is arranged on the left and right sides of the neck part 11.
1 may be arranged in the vertical direction to generate a four-pole correction magnetic field B.

Further, in the above embodiment, the inductance element was constituted by the differential coil 8, but this could be replaced with, for example, a diode as shown in FIG. A coil 12a having an inductance L between the anodes a and 7b and an inductance L2
A series connection body with a coil 12b having a
) may be connected to the terminal of the correction coil 5b. In this case, by changing the values of the inductance L of the coil 12a and the inductance L2 of the coil 12b, the magnitude of the current il flowing through the diode 7a side and the current 12 flowing through the diode 7b side is similarly adjusted to #A and corrected. The peak values i□ and i of the current can be arbitrarily adjusted, thereby making it possible to generate a correction current with an ideal parabolic waveform that is well-balanced left and right. However, if the inductance element is constituted by the differential coil 8 as in this embodiment, the inductance between both ends of the differential coil 8 remains constant even when the values of inductance L and L2 are arbitrarily changed. This inductance L1 and L2
An excellent effect can be obtained in that the horizontal deflection amplitude does not change due to the adjustment.

Further, in the above embodiment, the correction coils 5a and 5b are connected in series, but they may be connected in parallel.

[Effects of the Invention] According to the present invention, since the full-wave rectifier circuit can be configured with an inductance element and a pair of diodes, it is possible to reduce the number of components in the full-wave rectifier circuit. Manufacturing becomes easier, and it becomes possible to significantly reduce device costs.

Furthermore, by adjusting the inductance on one diode side and the inductance on the other diode side using the inductance division part of the inductance element as a reference, it is possible to create a parabolic current with an ideal waveform that is balanced between the left and right sides. It becomes possible to correct the misconvergence Xll with high precision using the parabolic current with this ideal waveform.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the main parts of an embodiment of a collar deflection yoke device according to the present invention, FIG. 2 is a diagram showing the arrangement of correction coils in the same embodiment, and FIG. 3 is a full-wavelength diagram in the same embodiment. A waveform explanatory diagram showing the rectifying action of the rectifying circuit, FIG. 4 is an explanatory diagram showing another arrangement example of the correction coil, and FIG. 5 is another form of the full-wave rectifying circuit constituting the collar deflection yoke device according to the present invention. Circuit diagram showing an example, Figure 6 shows Misconvergence XH
Fig. 6(a) is a pattern diagram of overtype misconvergence X□, Fig. 6(b) is a pattern example of
7 is a pattern diagram of an under type of misconvergence Xll, and FIG. 7 is a circuit diagram of a proposed color deflection yoke device. Ia, Ib, lc, ld...-diode, 2...
・Sensitivity adjustment coil, 3...Balance adjustment coil, 4
...Horizontal deflection coil, 5a, 5b...Correction coil,
6... Full wave rectifier circuit, 7a, 7b... Diode,
8... Differential coil, lQa, 10b-core, 11 ・
...Neck part, 12a. 12b...Coil.

Claims (1)

[Claims] A full-wave rectifier circuit is connected to the horizontal deflection coil of the color deflection yoke and generates a parabolic current by full-wave rectifying the horizontal deflection current.
A collar deflection yoke device is provided with a correction coil that generates a four-pole correction magnetic field for correcting misconvergence in the horizontal direction on the axis, and the full-wave rectifier circuit is connected at its cathode side. The correction coil has a pair of diodes and an inductance element connected between the anodes of the pair of diodes, and one end of the correction coil is connected to the cathode of the pair of diodes, and the other end of the correction coil is connected to the cathode of the pair of diodes. A collar deflection yoke device is connected to an inductance dividing portion of an inductance element, and an anode side of one side of the pair of diodes is connected to a horizontal deflection coil together with one end side of the inductance element.