JPH07272639A - Electron beam driven magnetic field generation device, and electron beam velocity modulation device, and horizontal and vertical deflection devices using the generation device - Google Patents

Abstract

PURPOSE:To provide a magnetic field generation device eliminating the need of a large-scale circuit via the use of an IC as well as saving manpower by providing a plurality of output circuits for outputting drive current having the same waveform, and a plurality of independently actuated drive magnetic field generation coils. CONSTITUTION:In the electron beam velocity modulation device shown in the block diagram, the inductance of each of divided velocity modulation coils 5a to 5n is small and allows the easy flow of the high frequency components of drive current, thereby improving high frequency characteristics. Also, voltage-current converters 3a to 3n may have small output capacity and, therefore, may be formed out of ICs, thereby allowing cost reduction. Also, the inductance of the coils 5a to 5n may be differently set, and the output capacity of the converters 3a to 3n may be pertinently set, so as to correspond thereto. In this vertical deflection device, vertical deflection current having the same waveform is fed to a plurality of vertical deflection coils from a plurality of vertical output coils receiving the same vertical deflection signals. Thus, the inductance of each vertical deflection coil can be made small.

Description

Detailed Description of the Invention

[0001]

This invention relates to a cathode ray tube (hereinafter referred to as
A device for generating a magnetic field that acts on an electron beam of a "CRT", specifically, an electron beam velocity modulation device, a horizontal deflection device, and a vertical deflection device.

[0002]

2. Description of the Related Art FIG. 7 is a block circuit diagram of a conventional electron beam velocity modulation device, 1 is an electron beam velocity modulation circuit, 2 is a differentiation circuit, 3 is a voltage / current converter for converting a voltage signal into a current signal, Reference numeral 4 is a CRT, 5 is a neck portion of the CRT 4, and a velocity modulation coil that generates an electron beam velocity modulation magnetic field that modulates the velocity of the electron beam, 6 is a horizontal deflection coil,
Reference numeral 7 is a horizontal deflection circuit, 8 is a vertical deflection coil, and 9 is a vertical deflection circuit.

Next, the operation of the conventional example will be described with reference to the waveform chart of FIG. The luminance signal having the waveform shown in FIG. 8A input to the differentiating circuit 2 is first-differentiated into a voltage signal having the waveform shown in FIG. 8B, and the voltage / current converter 3 outputs the current signal having the same waveform. And is supplied to the velocity modulation coil 5 to modulate the horizontal deflection magnetic field as shown in FIG. As a result, the horizontal deflection speed of the electron beam changes as shown in FIG.

On the other hand, the brightness signal is amplified by an amplifier (not shown) and applied to the first grid or cathode of the CRT 4 to modulate the brightness of the electron beam.
Portion A with a high horizontal deflection speed of the electron beam shown in (d)
Then the scanning speed of the electron beam becomes faster and the brightness decreases,
In the portion B where the horizontal deflection speed is slow, the scanning speed becomes slow and the brightness increases. As a result, as shown in FIG. 8E, contour correction is performed to enhance the brightness of the edge portion of the image, and the image quality is improved.

[0005]

In order to generate a velocity-modulating magnetic field of sufficient strength in a monitor for high-definition television or a personal computer used at a high horizontal deflection frequency using a conventional electron beam velocity modulator, a high frequency wave is required. It is necessary to reduce the inductance of the speed modulation coil 5 and increase the speed modulation current in order to pass the component, but this is not practical because there is a limit on the capacity of the driving element. Such a situation also applies to the relationship between the horizontal deflection coil and the horizontal deflection current of the horizontal deflection device.

Also in the vertical deflection device, when the vertical deflection amount is variable in order to switch to a cinemascope size or the like, the vertical deflection circuit is often composed of an IC circuit, but a large deflection output current is generated. It is difficult to obtain, and when the horizontal deflection frequency becomes higher, the vertical deflection retrace period also needs to be shortened, so that the high frequency component of the vertical deflection current increases, and when the vertical deflection coil with a large inductance is used, the high frequency component is increased. Has the same problem that it becomes difficult to pass through.

When the vertical deflection circuit is composed of a discrete circuit, such a problem is solved, but there is a problem that it is a little troublesome to switch the vertical deflection amount and the circuit scale becomes large. .

The present invention has been made for the purpose of solving the above-mentioned problems, and provides an electron beam drive magnetic field generator capable of achieving power saving without increasing the circuit scale by using an IC. With the goal.

[0009]

An electron beam driving magnetic field generator according to the present invention includes a plurality of output circuits for receiving the same driving signal and outputting driving currents having the same waveform, and an electron beam passing path for the electron beam. It is provided with a plurality of drive magnetic field generating coils which are respectively arranged and driven by output currents of the plurality of output circuits.

Further, the power supply control means for turning on / off the power supply to the plurality of drive magnetic field generating coils separately is provided.

Further, the electron beam velocity modulator according to the present invention comprises a differentiating circuit for differentiating the luminance signal, a plurality of voltage / current converters for receiving the differentiated voltage signal and outputting a driving current having the same waveform, It is provided with a plurality of electron beam velocity modulation coils arranged on the electron beam passage path and driven separately by the output currents of the plurality of voltage / current converters.

Further, the power supply control means for turning on / off the power supply to the plurality of speed modulation coils separately is provided.

Further, the horizontal deflection apparatus according to the present invention is arranged on a passage path of an electron beam, and a plurality of horizontal output circuits which receive horizontal deflection signals of the same waveform and output horizontal deflection currents of the same waveform. It is provided with a plurality of horizontal deflection coils which are individually driven by a plurality of horizontal output circuits.

Further, a power supply control means for turning on / off the power supply to the plurality of horizontal deflection coils separately is provided.

In the vertical deflection apparatus according to the present invention, a plurality of vertical output circuits for inputting vertical deflection signals having the same waveform and outputting vertical deflection currents having the same waveform are arranged on the electron beam passage path. It is provided with a plurality of vertical deflection coils which are individually driven by a plurality of vertical output circuits.

Further, a power supply control means for turning on / off the power supply to the plurality of vertical deflection coils separately is provided.

[0017]

The plurality of output circuits of the electron beam drive magnetic field generator according to the present invention are supplied with the same drive signal and output drive currents having the same waveform to the plurality of drive magnetic field generation coils. The magnetic fields generated by these driving magnetic field generating coils are combined to form an electron beam driving magnetic field.

Further, the plurality of power feeding control means turn on / off the power feeding to each driving magnetic field generating coil individually to change the strength of the generated driving magnetic field.

In the plurality of voltage / current converters of the electron beam velocity modulation magnetic field generating device according to the present invention, the voltage signal obtained by differentiating the luminance signal from the differentiating circuit is input, and the driving current having the same waveform is divided into a plurality of speeds. Output to the modulation coil. The magnetic fields generated by these velocity modulation coils are combined to form an electron beam velocity modulation magnetic field.

Further, the plurality of power supply control means turn on / off the power supply to the plurality of speed modulation coils individually to change the strength of the generated speed modulation magnetic field.

The plurality of horizontal output circuits of the horizontal deflection apparatus according to the present invention are supplied with horizontal deflection signals of the same waveform and output horizontal deflection currents of the same waveform to the plurality of horizontal deflection coils. The magnetic fields generated by these horizontal deflection coils are combined to form a horizontal deflection magnetic field.

Further, the plurality of power supply control means individually turn on and off the power supply to the plurality of horizontal deflection coils to change the strength of the generated horizontal deflection magnetic field.

Further, the plurality of vertical output circuits of the vertical deflection apparatus according to the present invention are supplied with vertical deflection signals of the same waveform, and output vertical deflection currents of the same waveform to the plurality of vertical deflection coils. The magnetic fields generated by these vertical deflection coils are combined to form a vertical deflection magnetic field.

Further, the plurality of power supply control means individually turn on and off the power supply to the plurality of vertical deflection coils to change the strength of the generated vertical deflection magnetic field.

[0025]

【Example】

Example 1. 1 is a block circuit diagram of an embodiment of an electron beam velocity modulator according to the present invention, and the same reference numerals as those in FIG. 7 denote the same or corresponding portions. In the figure,
Reference numerals 3a to 3n are voltage / current converters each having a small output capacity, to which the same differential voltage signal is input from the differentiating circuit 2 and which outputs 1 / n of the speed modulation current required for the maximum intensity speed modulation.

Reference numerals 5a to 5n are divided speed modulation coils divided into n pieces, each of which is constituted by a coil having a small inductance, and one corresponding voltage / current converter 3 is provided.
A velocity modulation current is supplied from a to 3n to generate a velocity modulation magnetic field, and these velocity modulation magnetic fields are combined to form a velocity modulation magnetic field having a predetermined strength.

According to the first embodiment, the inductance of each of the divided velocity modulation coils 5a to 5n is small, and the high frequency component of the drive current easily passes therethrough, so that the high frequency characteristics are improved. Moreover, since the output capacitance of the voltage / current converters 3a to 3n may be small, the voltage / current converters 3a to 3n can be configured by an IC, and the cost can be reduced.

The divided speed modulation coils 5a to 5n may be set to have different inductances.
The output capacity of the current converter may also be set to an appropriate capacity accordingly.

Example 2. 2 is a block circuit diagram of a second embodiment of the present invention, in which the same reference numerals as in FIG. 1 denote the same parts, 10a to 10n are mute circuits, 11 is a speed modulation control circuit, and 12 is a microcomputer.

Next, since the same components as those of the first embodiment operate in the same manner, the description thereof will be omitted, and the operations of different portions will be described. When the microcomputer 12 receives a speed modulation current amount command from a control system (not shown), it gives the speed modulation control circuit 11 the number of mute circuits 10 to be turned on in accordance with the current amount.

The speed modulation control circuit 11 gives an ON signal to the commanded number of mute circuits 10 and also gives an OFF signal to the other mute circuits 10. As a result, a driving current is supplied to the number of velocity modulation coils 5 commanded by the microcomputer 12, and a velocity modulation current of an amount commanded by a control system (not shown) is fed to the velocity modulation magnetic field of a predetermined strength. To form.

According to the second embodiment, the strength of the velocity modulation magnetic field can be adjusted by changing the number of mute circuits to be turned on, and the current amount of each voltage / current converter is adjusted. Therefore, it is possible to adjust the strength of the velocity modulation magnetic field in a wide range by using a voltage / current converter having a small dynamic range.

Example 3. FIG. 3 is a block circuit diagram of an embodiment of the horizontal deflection apparatus according to the present invention, and the same reference numerals as those in FIG. 7 denote the same or corresponding portions. In the figure, 6a to 6n are divided horizontal deflection coils divided into n pieces, 13 is a horizontal oscillation circuit, 14 is a horizontal drive circuit, and 1 is a horizontal drive circuit.
Reference numerals 5a to 15n denote horizontal output circuits each having a small output capacity, to which the same horizontal deflection signal is input from the horizontal drive circuit 14, and the horizontal deflection current required for horizontal deflection of maximum strength is 1 / n.
Output n.

Each of the divided horizontal deflection coils 6a to 6n is composed of a coil having a small inductance, and a horizontal deflection current is supplied from one corresponding horizontal output circuit 15a to 15n to generate a horizontal deflection magnetic field. The magnetic fields are combined to form a horizontal deflection magnetic field of predetermined strength.

According to the third embodiment, the inductance of each of the divided horizontal deflection coils 6a to 6n is small and the high frequency component of the drive current easily passes therethrough, so that the high frequency characteristics are improved. Further, since the horizontal output circuits 15a to 15n may have a small output capacity, they can be configured by an IC, and the cost can be reduced.

The inductances of the divided horizontal deflection coils 6a to 6n may be set to different sizes, and the output capacitance of the horizontal output circuit may be set to an appropriate capacitance accordingly.

Example 4. 4 is a block circuit diagram of a fourth embodiment of the present invention. The same reference numerals as those in FIG. 3 denote the same parts, 16a to 16n are mute circuits, 17 is a horizontal deflection control circuit, and 18 is a microcomputer.

Since the same components as those of the third embodiment operate in the same manner, the description thereof will be omitted and the operations of different portions will be described. When the microcomputer 18 receives a horizontal deflection current amount command from a control system (not shown), it gives the horizontal deflection control circuit 17 the number of mute circuits 16 to be turned on according to the current amount.

The horizontal deflection control circuit 17 gives an ON signal to the instructed number of mute circuits 16 and an OFF signal to the other mute circuits 16. As a result, a driving current is supplied to the horizontal deflection coils 6 in the number instructed by the microcomputer 18, and a horizontal deflection current in an amount instructed by a control system (not shown) is supplied to the horizontal deflection coils 6 having a predetermined strength. To form.

According to the fourth embodiment, the strength of the horizontal deflection magnetic field can be adjusted by changing the number of mute circuits to be turned on, and it is necessary to adjust the current amount of each horizontal output circuit. Therefore, a horizontal output circuit having a small dynamic range can be used to adjust the strength of the horizontal deflection magnetic field in a wide range.

Example 5. FIG. 5 is a block circuit diagram of an embodiment of the vertical deflection apparatus according to the present invention, and the same reference numerals as those in FIG. 7 denote the same or corresponding portions. In the figure, 8a to 8n are divided vertical deflection coils divided into n pieces, 19 is a vertical oscillation circuit, 20 is a vertical drive circuit, and 2 is a vertical drive circuit.
Vertical output circuits 1a to 21n each have a small output capacity. The same vertical deflection signal is input from the vertical drive circuit 20, and 1/21 of the vertical deflection current required for the vertical deflection with the maximum strength is input.
n is shared and output.

Each of the divided vertical deflection coils 8a to 8n is constituted by a coil having a small inductance, and a vertical deflection current is supplied from a corresponding one of the vertical output circuits 21a to 21n to generate a vertical deflection magnetic field. The magnetic fields are combined to form a vertical deflection magnetic field of predetermined strength.

According to the fifth embodiment, the inductance of each of the divided vertical deflection coils 8a to 8n is small and the high frequency component of the drive current easily passes therethrough, so that the high frequency characteristics are improved. Further, since the vertical output circuits 21a to 21n may have a small output capacitance, they can be configured by an IC, and the cost can be reduced.

The inductances of the divided vertical deflection coils 8a to 8n may be set to different values, and the output capacitance of the vertical output circuit may be set to an appropriate capacitance accordingly.

Example 6. 6 is a block circuit diagram of a sixth embodiment of the present invention, in which the same reference numerals as in FIG. 7 denote the same parts, 22a to 22n are mute circuits, 23 is a vertical deflection control circuit, and 24 is a microcomputer.

Next, since the same components as in the fifth embodiment operate in the same manner, the description thereof will be omitted, and the operations of different portions will be described. When the microcomputer 24 receives a vertical deflection current amount command from a control system (not shown), it gives the vertical deflection control circuit 23 the number of mute circuits 22 to be turned on in accordance with the current amount.

The vertical deflection control circuit 23 gives an ON signal to the instructed number of mute circuits 22 and an OFF signal to the other mute circuits 22. As a result, a driving current is supplied to the vertical deflection coils 8 in the number instructed by the microcomputer 24, and a vertical deflection current in an amount instructed by a control system (not shown) is supplied to the vertical deflection coils 8 of a desired strength. To form.

According to the sixth embodiment, the strength of the vertical deflection magnetic field can be adjusted by changing the number of mute circuits to be turned on, and it is necessary to adjust the current amount of each vertical output circuit. Therefore, a vertical output circuit having a small dynamic range can be used to adjust the strength of the vertical deflection magnetic field in a wide range.

The inductances of the divided vertical deflection coils 8a to 8n may be set to different values, and the output capacitance of the vertical output circuit may be set to an appropriate capacitance accordingly.

[0050]

Since the present invention is constructed as described above, the following effects can be obtained.

In the electron beam drive magnetic field generator according to the present invention, the drive currents having the same waveform are supplied to the drive magnetic field generation coils from the plurality of output circuits to which the same drive signal is input. The inductance of can be reduced. For this reason, the high frequency component of the drive current is easily passed, so that the high frequency characteristics can be improved. Further, since the output capacitance of the output circuit can be reduced, the output circuit can be configured by an IC, and the cost can be reduced.

Since the strength of the electron beam driving magnetic field is adjusted by switching the number of driving magnetic field generating coils to be fed by the feeding control means, the electron beam driving is performed over a wide range by using the output circuit having a small dynamic range. The strength of the magnetic field can be adjusted.

In the electron beam velocity modulator according to the present invention, a plurality of voltages / differential signals of the same luminance signal are input.
Since the drive current having the same waveform is supplied from the current converter to the plurality of velocity modulation magnetic field generating coils, the inductance of each velocity modulation magnetic field generating coil can be reduced. For this reason, the high frequency component of the drive current is easily passed, so that the high frequency characteristics can be improved. Further, since the output capacity of the voltage / current converter can be made small, it can be constituted by an IC, and the cost can be reduced.

Further, since the strength of the electron beam velocity modulation magnetic field is adjusted by switching the number of velocity modulation coils to be fed by the feeding control means, the voltage / current converter having a small dynamic range can be used to cover a wide range. The strength of the electron beam velocity modulation magnetic field can be adjusted.

In the horizontal deflection apparatus according to the present invention, the horizontal deflection currents of the same waveform are supplied to the horizontal deflection coils from the plurality of horizontal output circuits to which the same horizontal deflection signal is input, so that the inductance of each horizontal deflection coil is increased. Can be made smaller. For this reason, the high-frequency component of the horizontal deflection current easily passes through, so that the high-frequency characteristics are improved. In addition, since the horizontal output circuit can have a small output capacity, it can be configured by an IC, and the cost can be reduced.

Further, since the strength of the horizontal deflection magnetic field is adjusted by switching the number of horizontal deflection coils to be fed by the feeding control means, the horizontal deflection magnetic field can be spread over a wide range by using the horizontal output circuit having a small dynamic range. Strength adjustment can be performed.

In the vertical deflection apparatus according to the present invention, since the vertical deflection currents of the same waveform are supplied to the vertical deflection coils from the plurality of vertical output circuits to which the same vertical deflection signal is input, the inductance of each vertical deflection coil is increased. Can be made smaller. For this reason, the high frequency component of the vertical deflection current easily passes through, so that the high frequency characteristics are improved. Further, since the vertical output circuit can have a small output capacity, it can be configured by an IC, and the cost can be reduced.

Further, since the strength of the vertical deflection magnetic field is adjusted by switching the number of vertical deflection coils to be fed by the feeding control means, the vertical deflection magnetic field can be applied over a wide range by using the vertical output circuit having a small dynamic range. Strength adjustment can be performed.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of an electron beam velocity modulator according to a first embodiment of the present invention.

FIG. 2 is a block circuit diagram of an electron beam velocity modulator according to a second embodiment of the present invention.

FIG. 3 is a block circuit diagram of a horizontal deflection device according to a third embodiment of the present invention.

FIG. 4 is a block circuit diagram of a horizontal deflection device according to a fourth embodiment of the present invention.

FIG. 5 is a block circuit diagram of a vertical deflection device according to a fifth embodiment of the present invention.

FIG. 6 is a block circuit diagram of a vertical deflection device according to a sixth embodiment of the present invention.

FIG. 7 is a block circuit diagram of a conventional electron beam velocity modulator.

FIG. 8 is a signal waveform diagram for explaining the operation of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electron beam velocity modulation circuit 2 Differentiation circuit 3 Voltage / current conversion circuit 4 Cathode ray tube (CRT) 5 Velocity modulation coil 5a-5n Divided velocity modulation coil 6 Horizontal deflection coil 6a-6n Divided horizontal deflection coil 7 Horizontal deflection circuit 8 Vertical deflection Coil 8a-8n Split vertical deflection coil 9 Vertical deflection circuit 10 Mute circuit 11 Speed modulation control circuit 12 Microcomputer 13 Horizontal oscillation circuit 14 Horizontal drive circuit 15 Horizontal output circuit 16 Mute circuit 17 Horizontal deflection control circuit 18 Microcomputer 19 Vertical oscillation circuit 20 vertical drive circuit 21 vertical output circuit 22 mute circuit 23 vertical deflection control circuit 24 microcomputer

Claims (8)

[Claims] 1. A plurality of output circuits which receive a drive signal and output a drive current having the same waveform, and a plurality of drive magnetic fields which are arranged on an electron beam passage path and are individually driven by the plurality of output circuits. An electron beam drive magnetic field generator equipped with a coil. 2. The electron beam drive magnetic field generation device according to claim 1, further comprising a power supply control means for turning on / off power supply to each of the plurality of drive magnetic field generation coils. 3. A differentiating circuit for differentiating a luminance signal, a plurality of voltage / current converters that receive the differentiated voltage signal and output a driving current having the same waveform, and a differentiating circuit arranged on the electron beam passage path. An electron beam velocity modulation device comprising a plurality of electron beam velocity modulation coils that are individually driven by output currents of a plurality of voltage / current converters. 4. An electron beam velocity modulator according to claim 3, further comprising a feed control means for turning on and off the feed to the plurality of velocity modulation coils separately. 5. A plurality of horizontal output circuits that receive horizontal deflection signals of the same waveform and output horizontal deflection currents of the same waveform, and are individually driven by the plurality of horizontal output circuits that are arranged on the passage path of the electron beam. Deflection apparatus having a plurality of horizontal deflection coils. 6. The high-frequency compatible horizontal deflection apparatus according to claim 5, further comprising power supply control means for turning on and off power supply to the plurality of horizontal deflection coils separately. 7. A plurality of vertical output circuits that receive a vertical deflection signal of the same waveform and output a vertical deflection current of the same waveform, and a plurality of vertical output circuits that are arranged on the electron beam passage path and are individually driven by the plurality of vertical output circuits. Vertical deflection device having a plurality of vertical deflection coils. 8. The vertical deflection apparatus according to claim 7, further comprising power supply control means for turning on / off the power supply to the plurality of vertical deflection coils separately.