JP2000208070A - Convergence correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct a device with a simple structure even if it has miss- convergence of a specified pattern by interposing a thin and flat spiral coil between a neck and a deflection yoke. SOLUTION: A thin and flat spiral air-core coil 6 is interposed in a side of an inner peripheral surface of a deflection yoke 5, that is, between a neck 2 and the deflection yoke 5, miss-convergence is corrected with the thin coil 6. The thin coil preferred is a loop coil short-circuited with a curled inner end and a outer end, and is a coil composed so that current is supplied to the thin coil. Moreover, the thin coil preferred is a coil affixed at a desired position between the neck and the deflection yoke, and is a coil interposed between the neck and the deflection yoke in a state affixed on one end side of an sheet shaped insulating member. A magnetic field strength with the deflection yoke is weakened, and a degree of strong and weak of the magnetic field strength is adjusted to correct, so that a correcting device, which can correspond to a partial miss-convergence, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence correction apparatus for correcting misconvergence of a cathode ray tube (hereinafter referred to as "misconversion") used for a television receiver or a display monitor.

[0002]

2. Description of the Related Art Generally, misconversions that occur in a cathode ray tube are roughly classified into those that cause a convergence deviation of a specific pattern on a display screen of the cathode ray tube (hereinafter referred to as "specific pattern misconversion") and those on the display screen. There are two types, one in which convergence deviation occurs only in the upper part (hereinafter, referred to as “partial misconvergence”).

Conventionally, misconversion of a specific pattern has been performed by the following convergence correction device.
The correction has been made. For example, VCR (Vertical C
In the case of a misconversion of a specific pattern called enterRaster, the convergence deviation is corrected by a convergence correction device including a saturable reactor and a dynamic correction coil (quadrupole coil). In addition, the correction method differs depending on the pattern to be corrected. However, for a misconversion of a specific pattern, a saturable reactor is usually used to correct the convergence deviation.

On the other hand, partial misconversion has been conventionally corrected by a convergence correction device provided with a magnetic piece made of a soft magnetic material (for example, a sheet formed by mixing ferrite particles in permalloy or rubber). Has been done. That is, a magnetic piece made of a soft magnetic material is inserted between the deflection yoke and the neck portion of the cathode ray tube, and the convergence deviation is corrected by increasing the magnetic field strength of the deflection yoke in a portion where misconversion occurs. You.

[0005]

However, among the above-mentioned conventional convergence correction devices, in the convergence correction device for correcting a misconversion of a specific pattern, if the VCR correction is performed, for example, four horizontal convergence correction devices are used. Coil and one vertical coil, and also 2
It is necessary to provide a saturable reactor having two magnetic bias magnets as components, a quadrupole coil using a pair of coils each having a U-shaped core wound with two coils, and the like. In other words, a convergence correction device that corrects a misconversion of a specific pattern requires a complicated configuration for the misconversion correction, resulting in an increase in the size and cost of the device. In addition, there is a possibility that a magnetic bias magnet may be affected by mislanding or the like.

On the other hand, a convergence correction device for correcting partial misconversion does not require a complicated configuration for misconversion correction, but only copes with a case where it is necessary to increase the magnetic field strength by the deflection yoke. Can not do it. In other words, a magnetic piece made of a soft magnetic material is inserted between the deflection yoke and the neck portion to increase the magnetic field strength by the deflection yoke and correct the convergence. Convergence correction cannot be performed by adjusting the degree of the convergence. Therefore, in this convergence correction device,
It is difficult to realize a flexible response to various types of partial mistakes.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a convergence correction device capable of correcting a mis-con of a specific pattern with a simple configuration. Furthermore, the present invention provides a convergence correction device that can flexibly cope with partial misconversion by weakening the magnetic field intensity by the deflection yoke or by adjusting the degree of the strength to correct the intensity. With the goal.

[0008]

SUMMARY OF THE INVENTION The present invention provides a convergence correction device devised to achieve the above object,
An electron beam emitted by an electron gun is used in a cathode ray tube configured to deflect an electron beam by a deflection yoke provided on an outer periphery of a neck portion in which the electron gun is inserted. A thin coil wound spirally and in a flat plate shape is interposed between the deflection yoke.

According to the convergence correction device having the above structure, since the thin coil is interposed between the neck of the cathode ray tube and the deflection yoke, for example, the magnetic force generated by the deflection yoke is converted into electric energy by the thin coil. By converting or applying a current to the thin coil to generate a magnetic field different from that of the deflection yoke, it is possible to weaken the strength of the magnetic field by the deflection yoke or to adjust the degree of the strength. Also, depending on the waveform of the current applied to the thin coil,
Not only the strength of the magnetic field intensity due to the deflection yoke but also the component of the magnetic field can be partially corrected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A convergence correction device according to the present invention will be described below with reference to the drawings.

[First Embodiment] Here, a convergence correction device according to the first, second, fourth and fifth aspects of the present invention will be described. FIG. 1 is an explanatory diagram illustrating an outline of an example of a convergence correction device according to the present embodiment, and FIG. 2 is a schematic configuration diagram illustrating an example of a cathode ray tube using the convergence correction device.

Here, prior to the description of the convergence correction device of the present embodiment, a cathode ray tube using the convergence correction device will be described. As shown in FIG. 2, a cathode ray tube using the convergence correction device includes an electron gun 1 that emits an electron beam, a neck portion 2 into which the electron gun 1 is inserted, and an electron beam from the electron gun 1. A fluorescent screen 3 to be illuminated, a funnel 4 connecting the fluorescent screen 3 to the neck 2, and a deflection yoke 5 provided on the outer periphery of the neck 2 are provided. The electron beam emitted from the electron gun 1 is deflected up, down, left, and right by a magnetic field generated by the deflection yoke 5, so that the electron beam irradiates the entire phosphor screen 3.

As shown in FIG. 1, the convergence correction device used in such a cathode ray tube has an air-core spiral shape on the inner peripheral surface side of the deflection yoke 5, that is, between the neck portion 2 and the deflection yoke 5. In addition, a thin coil 6 wound in a plate shape is interposed, and misconversion is corrected by the thin coil 6.

Here, the thin coil 6 will be described in detail. FIG. 3 is an explanatory diagram showing the thin coil 6 in the present embodiment.

As shown in FIG. 3 (a), this thin coil 6 constitutes a loop coil in which a spiral inner end and an outer end are connected and short-circuited. However, the thin coil 6 may be affixed to one end of a sheet-shaped insulating member 7 as shown in FIG.

Such a spiral thin coil 6 may be formed by, for example, the following method. A spiral coil is wound with a copper wire or the like whose surface is covered with a resin material that melts by heating and solidifies and adheres when cooled, and the coil is heated by energizing this coil to melt the resin material once. Then, the thin coil 6 is formed by being cooled and solidified in a spiral shape. By creating a spiral pattern on the flexible printed circuit board by etching and using this as a coil,
The thin coil 6 is formed. A spiral coil is wound with a copper wire or the like using a mold, and the thin coil 6 is molded in accordance with the mounting position. An extremely thin bobbin is manufactured, and a thin coil 6 is formed by directly winding a bobbin with a copper wire or the like.

In other words, the thin coil 6 may be formed by any of the above-mentioned methods as long as it is formed as thin as possible in relation to its mounting position.

The thin coil 6 thus formed is disposed so as to be interposed between the neck 2 and the deflection yoke 5. More specifically, for example, a partial misconduct occurs due to the design reason of the deflection yoke 5, and if a position where the magnetic field of the deflection yoke 5 should be weakened is known in advance, the position (predetermined position) is set. The thin coil 6 is attached. At this time, the thin coil 6 may be mechanically attached using a hook, a protrusion, a dent, or the like provided on the deflection yoke 5 side, or may be attached to the neck portion 2 or a double-sided tape or an adhesive using an adhesive or the like. It may be directly attached to the deflection yoke 5. When the thin coil 6 is attached to a predetermined position, the configuration can be easily simplified.

On the other hand, if the position where the magnetic field of the deflection yoke 5 should be weakened is not known, the thin coil 6 and the insulating member 7 shown in FIG. To intervene. That is, at the time of adjusting the convergence of the cathode ray tube, the thin coil 6 and the insulating member 7 are inserted into the gap between the neck portion 2 and the deflection yoke 5, and an operator or the like confirms an effective position for correcting partial misconversion. While fixing them in the best position. In this case, versatility of the arrangement position of the thin coil 6 can be secured.

Here, as described above, using the thin coil 6 disposed so as to be interposed between the neck portion 2 and the deflection yoke 5, the mis-conversion generated when the deflection yoke 5 deflects the electron beam. Will be described, that is, misconversion correction performed by the convergence correction device of the present embodiment will be described. This convergence correction device is suitable for use in correcting partial misconversion.

When the deflection yoke 5 generates a magnetic field to deflect the electron beam with the thin coil 6 interposed between the neck portion 2 and the deflection yoke 5, the thin coil 6
Electric energy is generated by the influence of the magnetic field. That is, the thin coil 6 converts the magnetic force received from the magnetic field into electric energy such as current. However, since the thin coil 6 forms a loop coil, the electric energy generated by the thin coil 6 is converted into other energy such as heat or vibration and diverged. Therefore, the deflection yoke 5
Generates a magnetic field, at a position near the thin coil 6,
The magnetic field is weakened by the energy conversion in the thin coil 6.

From this, the thin coil 6 can be used to obtain the effect of weakening the magnetic field in the local part of the deflection yoke 5. That is, since the magnetic field behavior is opposite to that of the magnetic piece in the related art described above, it is possible to weaken the magnetic field strength by the deflection yoke. for that reason,
It is also possible to correct a type of miscon which could not be corrected by a conventional magnetic piece.

Further, since the thin coil 6 constituting the loop coil is used, wiring or the like to the thin coil 6 is unnecessary, and the arrangement between the neck portion 2 and the deflection yoke 5 is very easy. In addition, there is no complication of the device configuration.

The size of the coil itself and the number of turns in the thin coil 6 may be determined according to the size and the degree of weakening of the magnetic field. For example,
Thin coils 6 of several sizes and number of windings are prepared in advance, and selected as needed, and the neck 2 and the deflection yoke 5 are selected.
And fine adjustment for partial correction of misconduct is also possible.

[Second Embodiment] Next, a convergence correction apparatus according to the third aspect of the present invention will be described. However, here, only the differences from the above-described first embodiment will be described.

The convergence correction device of this embodiment differs from the first embodiment in the thin coil. FIG. 4 is an explanatory diagram illustrating the thin coil 6a according to the present embodiment.

As shown in FIG. 4A, this thin coil 6a does not constitute a loop coil as in the case of the first embodiment, and the spiral inner end and outer end are respectively formed. They can be separately connected to an external circuit (not shown) (for example, a current supply circuit provided in a television receiver or the like). That is, the thin coil 6a is configured to be capable of supplying an external current to the thin coil 6a. As in the case of the first embodiment, the thin coil 6a may be attached to one end of a sheet-shaped insulating member 7a, as shown in FIG. 4B.

Here, a description will be given of the misconversion correction using the thin coil 6a configured as described above, that is, the misconversion correction by the convergence correction device of the present embodiment. This convergence correction device is also suitable for use in correcting partial misconversion, as in the first embodiment.

In the thin coil 6a, for example, when a direct current is supplied from an external circuit, a magnetic field is generated by the current. The direction of the magnetic field generated at this time, the strength and the like thereof vary depending on the polarity and magnitude of the current applied to the thin coil 6a.

Therefore, the thin coil 6a is
When an external circuit supplies a current to the thin coil 6a while the deflection yoke 5 is interposed between the deflection yoke 5 and the deflection yoke 5 generating a magnetic field for deflecting the electron beam, the deflection yoke 5 The magnetic field is offset or enhanced by the magnetic field generated by the thin coil 6a separately, and as a result is weakened or strengthened. Moreover, the degree of the strength changes according to the polarity and magnitude of the current applied to the thin coil 6a.

From this, the thin coil 6a can be used to obtain the effect of controlling the strength of the magnetic field at the local portion of the deflection yoke 5, and the like. That is, it is possible to flexibly cope with various types of partial mis-cons that could not be corrected by the conventional magnetic piece.

Moreover, in the thin coil 6a, the magnetic field of the deflection yoke 5 can be increased or decreased depending on the polarity and magnitude of the applied current, so that the coil has only one size and the number of turns. However, if the function of adjusting the polarity and magnitude of the current is provided, it is possible to easily cope with various types of mis-correction.

Even when the thin coil 6a is used, as described in the first embodiment, if several types of coils are prepared in advance and can be selected as needed, Needless to say, even if there is no function of adjusting the polarity and magnitude of the current, it is possible to flexibly cope with miscons.

[Third Embodiment] Next, a convergence correction apparatus according to the sixth and seventh aspects of the present invention will be described. Here, however, only the differences from the above-described first and second embodiments will be described.

In the convergence correction device of the present embodiment, similarly to the second embodiment, the thin coil 6a capable of supplying an external current is interposed by the insulating member 7a having one end attached thereto. Thereby, it is located between the neck part 2 and the deflection yoke 5.

However, in this embodiment, the arrangement position of the thin coil 6a is different from that of the second embodiment. FIG. 5 is an explanatory diagram showing an arrangement position of the thin coil 6a in the present embodiment.

In the present embodiment, a plurality (for example, four) of thin coils 6a and insulating members 7a are arranged, and all of them are, as shown in FIG. The deflection yoke 5 is arranged along the axial direction (x, y) when the deflection yoke 5 is viewed from the funnel section 4 side. Alternatively, for example, as shown in FIG. 5 (b), all of them are at a predetermined angle (for example, approximately 45
°), that is, with a predetermined angle of inclination from the axial direction (x, y).

Further, in this embodiment, unlike the second embodiment, an external circuit supplies a correction waveform current to each thin coil 6a. Here, the corrected waveform current refers to a current having a waveform suitable for the pattern of the misconduct to be corrected, and specifically, a current obtained by modulating a parabolic current waveform, a sawtooth current waveform, or the like with a vertical or horizontal deflection current. That is, it means a current having the same waveform as that in the case where the correction is performed using the saturable reactor, the quadrupole coil, or the like described in the section of the related art. Therefore, for example, when the misconduct to be corrected is a VCR, a current waveform obtained by modulating a horizontal period parabolic current waveform with a vertical deflection current is selected, and this current is replaced with a dynamic correction coil (quadrupole coil) instead of each thin type. It will be supplied to the coil 6a. The details of the correction waveform current (waveform modulation method, circuits necessary for the modulation, and the like) are based on well-known techniques, and thus detailed description thereof is omitted here.

Here, a description will be given of the misconversion correction using the thin coils 6a arranged as described above, that is, the misconversion correction by the convergence correction apparatus of the present embodiment. This convergence correction device is suitable for use in correcting a misconversion of a specific pattern.

In a state where each thin coil 6a is interposed between the neck portion 2 and the deflection yoke 5 and the deflection yoke 5 generates a magnetic field for deflecting the electron beam, an external circuit is used for the thin coil 6a. When the correction waveform current is supplied to the thin coil 6a, the magnetic field generated by the deflection yoke 5 is partially corrected because the correction waveform current is supplied to each thin coil 6a. For example, when each thin coil 6a is arranged along the axial direction (x, y) of the deflection yoke 5 (see FIG. 5A), vertical correction can be performed. Further, for example, when each thin coil 6a is arranged with an inclination of approximately 45 ° with respect to the axial direction (x, y) of the deflection yoke 5 (see FIG. 5B), it is possible to correct in the horizontal direction. Become.

Thus, the neck 2 and the deflection yoke 5
A plurality of thin coils 6a interposed therebetween can be used to correct miscons of a specific pattern appearing on the display screen of the cathode ray tube. That is, it is possible to correct a mis-connection of a specific pattern with a simple configuration without requiring a complicated configuration such as a conventional saturable reactor or a quadrupole coil. Therefore, it is easier to suppress an increase in the size and cost of the apparatus as compared with the related art. Moreover, since it is not necessary to use a magnet for a magnetic bias, there is no influence of mislanding or the like as a result of misconduct correction.

In the present embodiment, in order to enable the correction in the horizontal direction, an example is shown in which the thin coils 6a are arranged at an inclination of about 45 ° with respect to the axial direction (x, y) of the deflection yoke 5. However, the present invention is not limited to this. That is, it is conceivable to change the angle at which each thin coil 6a is arranged in accordance with the pattern of the misconduct to be corrected.

The position of each thin coil 6a is on the inner peripheral surface side of the deflection yoke 5, that is, between the neck portion 2 and the deflection yoke 5, and between the opening of the deflection yoke 5 on the neck portion 2 side and the funnel portion. If it is between the four side openings, it may be arranged at an arbitrary position according to the pattern of the misconduct to be corrected.

[0044]

As described above, according to the convergence correction device of the present invention, for example, the magnetic force generated by the deflection yoke is converted into electric energy by the thin coil by the thin coil interposed between the neck portion and the deflection yoke. By converting or applying a current to the thin coil to generate a magnetic field different from that of the deflection yoke, the strength of the magnetic field by the deflection yoke can be reduced or the degree of the strength can be adjusted. Also, depending on the waveform of the current applied to the thin coil,
Not only the strength of the magnetic field intensity due to the deflection yoke but also the component of the magnetic field can be partially corrected. Therefore, if this convergence correction device is used, there is no need for a complicated configuration for misconversion correction,
It becomes possible to correct miscons of a specific pattern, and as a result, it is possible to suppress an increase in the size and cost of the apparatus, and the correction does not affect the mislanding. Furthermore, if this convergence correction device is used, it is possible to flexibly cope with partial misconversion by weakening the magnetic field intensity by the deflection yoke or by adjusting the degree of the strength to make correction possible. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of an example of an embodiment of a convergence correction device according to the present invention.

FIG. 2 is a schematic configuration diagram illustrating an example of a cathode ray tube using the convergence correction device according to the present invention.

FIG. 3 shows a first example of the convergence correction device according to the present invention.
It is an explanatory view showing a thin coil in the embodiment,
(A) is a figure which shows a coil itself, (b) is a figure which shows an example of the supported state.

FIG. 4 shows a second example of the convergence correction device according to the present invention.
It is an explanatory view showing a thin coil in the embodiment,
(A) is a figure which shows a coil itself, (b) is a figure which shows an example of the supported state.

FIG. 5 shows a third example of the convergence correction apparatus according to the present invention.
It is explanatory drawing which shows the arrangement | positioning state of the thin coil in embodiment, (a) is a figure which shows an example, (b) is a figure which shows another example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electron gun, 2 ... Neck part, 4 ... Funnel part, 5 ... Deflection yoke, 6, 6a ... Thin coil, 7, 7a ... Insulating member

Claims (7)

[Claims] 1. A convergence correction device used in a cathode ray tube configured to deflect an electron beam emitted by an electron gun by a deflection yoke provided on an outer periphery of a neck portion into which the electron gun is inserted. Between the neck portion and the deflection yoke, in a spiral shape,
A convergence correction device comprising a thin coil wound in a plate shape. 2. The convergence correction device according to claim 1, wherein the thin coil is a loop coil in which a spiral inner end and an outer end are connected and short-circuited. 3. The convergence correction device according to claim 1, wherein the thin coil is configured to be able to supply a current to the thin coil. 4. The convergence correction device according to claim 1, wherein the thin coil is affixed to a predetermined position between the neck and the deflection yoke. 5. The thin coil is interposed between the neck and the deflection yoke while being attached to one end of a sheet-shaped insulating member. Convergence correction device. 6. A device comprising a plurality of said thin coils,
2. The convergence correction device according to claim 1, wherein each of the thin coils is disposed along a vertical direction and a horizontal direction when viewed from a radiation direction of the electron beam. 7. A device comprising a plurality of said thin coils,
2. The convergence correction device according to claim 1, wherein each of the thin coils is disposed at a predetermined angle from a vertical direction or a horizontal direction when viewed from a radiation direction of the electron beam.