JPH0946719A - Deflection yoke, and color cathode-ray tube device and display device using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct the complicated erroneous convergence of a vertical line by changing a current made to flow to first and second auxiliary coils for vertical deflection corresponding to the direction and size of a vertical deflection current. SOLUTION: The first and second auxiliary coils 7a and 7b for the vertical deflection provided on the electron gun side of this deflection yoke and serially connected to a vertical deflection coil 3 are provided and the two kinds of diode circuits 18a and 18b of different forward direction conductive timings are anti-parallelly respectively connected to a first resistor 14a serially connected to the first auxiliary coil 7a and a second resistor 14b serially connected to the second auxiliary coil 7b. Then, the first and second resistors 14a and 14b are bypassed and the current made to flow to the first and second auxiliary coils is changed corresponding to the direction and size of the vertical deflection current. Thus, the correction direction of the erroneous convergence of the vertical line by the first and second auxiliary coils 7a and 7b is inversed and the erroneous convergence is made correctable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection cathode mounted on a color cathode ray tube for forming a multi-electron beam in an in-line arrangement, a color cathode ray tube device and a display device using the deflection yoke, and more specifically, Relates to convergence correction means.

[0002]

2. Description of the Related Art Deflection yokes equipped with convergence correction means are disclosed in, for example, Japanese Patent Laid-Open Nos. 3-247093 and 3-82290. These convergence correction means connect a pair of diodes to the upper side correction coil and the lower side correction coil in opposite directions to each other, and connect an impedance element between the respective diodes, so that a simple vertical line is formed. This is to correct the bow-shaped misconvergence.

[0003]

These convergence correction means have a pattern in which the vertical line misconvergence amount simply increases in an arc shape as the vertical position changes from the vertical center of the screen. It is to make a correction. Therefore, it is not possible to perform correction for the one including a complicated misconvergence in which the correction directions are reversed in the vicinity of the central portion of the screen and the regions above and below the central portion.

It is an object of the present invention to provide a deflection yoke capable of correcting a complicated misconvergence of a vertical line in which the correction directions are opposite in the area near the center of the screen and in the areas at the upper and lower ends. It is in.

[0005]

SUMMARY OF THE INVENTION The present invention is a deflection yoke attached to a color cathode ray tube having a horizontal deflection coil and a vertical deflection coil, and an electron gun for generating multiple electron beams in an in-line arrangement. A first auxiliary coil and a second auxiliary coil for vertical deflection, which are provided on the electron gun side and are connected in series with the vertical deflection coil.
A first resistor and a second resistor connected in series with the auxiliary coil of
To the second resistor connected in series with the auxiliary coil, and two diode circuits having different forward conduction timings are respectively connected in anti-parallel relation, and the first and second resistors are bypassed to bypass the first resistor. The current flowing through the first and second auxiliary coils is changed according to the direction and magnitude of the vertical deflection current.

Specifically, the diode circuit increases the current flowing through the first auxiliary coil in the region where the vertical deflection current in one direction is small and increases the current flowing through the second auxiliary coil in the region where the vertical deflection current is large. The current flowing through the second auxiliary coil is increased in the region where the vertical deflection current in the other direction is small, and the current flowing through the first auxiliary coil is increased in the region where the vertical deflection current is large.

[0007]

According to the direction and magnitude of the vertical deflection current, the current flowing through the first and second auxiliary coils bypasses the resistor and flows into the diode circuit to increase, thereby increasing the first and second auxiliary coils. Reverses the direction of vertical line misconvergence correction by the coil. Therefore, it is possible to correct the misconvergence of vertical lines whose directions are opposite to each other in the central portion and the upper and lower end portions of the screen.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a side view showing a color cathode ray tube device having a deflection yoke according to the present invention, and FIG. 3 is a rear view of the deflection yoke as seen from the back. In the figure, 1 is a deflection yoke according to the present invention, 2 is a horizontal deflection coil, 3 is a vertical deflection coil, 4 is a main core, 5 is a separator, 6a and 6b are sub-cores, and 7a and 7b are vertical deflection upper and lower sides. Auxiliary coil,
8 is a terminal cover, 9 is an electron gun, 10 is a static convergence magnet, 11 is a color cathode ray tube, 1
2 is a fluorescent screen.

The deflection yoke 1 is attached to the neck portion of the color cathode ray tube 11, and controls deflection of the in-line array of multiple electron beams generated by the electron gun 9 provided at the tip portion of the neck portion. The main core 4 made of a magnetic material is arranged around the horizontal deflection coil 2 and the vertical deflection coil 3. The U-shaped sub-cores 6a and 6b made of a magnetic material are arranged on the electron gun 9 side of the deflection yoke 1 so as to face each other vertically with the neck portion of the color cathode ray tube 11 interposed therebetween, and are wound vertically. Upper auxiliary coil (hereinafter referred to as upper coil) 7a and vertical deflection lower auxiliary coil (hereinafter referred to as lower coil) 7b
A vertical deflection magnetic field is generated by being energized by a vertical deflection current flowing in the.

FIG. 4 shows the relationship between the vertical deflection magnetic field generated by the sub-cores 6a and 6b, the upper coil 7a and the lower coil 7b and the deflection force acting on the electron beam. In this figure, 19B, 19G and 19R are electron beams and 2
Reference numeral 0 indicates a vertical deflection magnetic field, and 21B, 21G, and 21R indicate deflection forces acting on each electron beam.

5A to 5E show convergence patterns. In the figure, 12 is a phosphor screen (screen), 24B is a blue vertical line, and 24R is a red vertical line.

FIGS. 5A and 5B are convergence patterns to be corrected by the present invention. As shown in the figure, a blue vertical line 24B and a red vertical line 24R intersect in an intermediate region from the center of the screen 12 in the vertical direction to the upper and lower ends. When the vertical line correction circuit for correcting the vertical line that changes in a bow shape is used to correct FIG. 5A so that the upper and lower end portions of the screen 12 coincide with each other, the result is as shown in FIG. 5C. There is a problem that B-shaped vertical line misconvergence occurs. Similarly, when FIG. 5B is corrected by the conventional vertical line correction circuit, there is a problem that a B-shaped vertical line misconvergence as shown in FIG. 5D occurs.

A first embodiment of the present invention capable of correctly correcting a pattern as shown in FIGS. 5A and 5B will be described with reference to the drawings. The same constituents as those of the conventional apparatus described above are designated by the same reference numerals to omit redundant description or omit illustration.

FIG. 1 is an electric circuit diagram showing a first embodiment of the present invention. In the figure, 3 is a vertical deflection coil, 7
a is an upper coil, 7b is a lower coil, 14a and 14b are fixed resistors, 15a is a variable resistor, and 18a to 18d are diodes.

The upper coil 7a and the fixed resistor 14a are connected in series, the lower coil 7b and the fixed resistor 14b are connected in series, and both series circuits are connected in parallel.
The common connection point of the fixed resistors 14a and 14b is connected to the vertical deflection coil 3 in series. A first diode series circuit in which the diodes 18a and 18b are connected in series in the same direction is used as a connection point between the upper coil 7a and the fixed resistor 14a and a connection point between the lower coil 7b and the fixed resistor 14b. Connected between. Similarly, the second diode series circuit in which the diodes 18c and 18d are connected in series in the same direction is replaced by the diodes 18a and 18b.
Is connected between the connection points in the opposite direction to the series circuit.

Diodes 18a, 18b and diode 1
Diodes having different forward conduction voltage characteristics are used as 8c and 18d. For example, Schottky diodes having a low forward conduction voltage are used as the diodes 18a and 18b, and the diodes 18c and 18d are the diodes 18a and 1b.
A diode with a high forward conduction voltage is used for 8b.

The series connection point of the diodes 18a and 18b in the first diode series circuit is connected to the connection point between the fixed resistors 14a and 14b and the vertical deflection coil 3 via the variable resistor 15a, and the second diode series circuit is connected. The series connection point of the diodes 18c and 18d in is directly connected to the connection point of the fixed resistors 14a and 14b and the vertical deflection coil 3.

In this way, in the first half of the vertical deflection cycle, the vertical deflection current Iv flowing through the vertical deflection coil 3 flows in the direction of the arrow and is divided into the fixed resistors 14a and 14b and the current Ia flowing through the upper coil 7a. It becomes the current Ib flowing through the lower coil 7b. The fixed resistors 14a and 14b work so as to generate a potential difference for making the diodes 18a to 18d conductive.

In the region where the vertical deflection current Iv is small, only the diode 18a having a low forward conduction voltage conducts because the voltage drop (potential difference) generated in the fixed resistors 14a and 14b is small. In this state, since the variable resistor 15a is connected in parallel to the fixed resistor 14a and the bypass current flows, the current Ia flowing through the upper coil 7a becomes larger than the current Ib flowing through the lower coil 7b. As a result, the vertical deflection magnetic field 20 has a shape as shown in FIG. 4A, and the blue electron beam 19B has a deflection force 21B inclined to the right, and the red electron beam 19R has a deflection inclined to the left. The force 21R acts. As a result, as shown in FIG. 5A, the vertical lines 24B, 2 near the center of the screen 12 are displayed.
A correction action occurs in the direction of matching the 4Rs.

Then, in the region where the vertical deflection current Iv is large, the voltage drop (potential difference) generated in the fixed resistors 14a and 14b becomes large, and in addition to the diode 18a having a low forward conduction voltage, the diode having a high forward conduction voltage. 18d also conducts. When the diode 18d becomes conductive, the current Ib flowing through the lower coil 7b bypasses the fixed resistor 14b and flows through the diode 18d, so that the current Ib increases to be larger than the current Ia flowing through the upper coil 7a. . As a result, the vertical deflection magnetic field 20 is
The blue electron beam 19 has a shape as shown in FIG.
B has a deflection force 21B tilted to the left and a red electron beam 1
The deflection force 21R inclined rightward acts on 9R. As a result, a correction action occurs in the direction in which the vertical lines 24B and 24R at the upper end portion in the upper area of the screen 12 shown in FIG.

In the lower region of the screen 12, the direction of the vertical deflection current Iv is opposite to that of the arrow, so that the diode 1
8b and the diode 18c operate in the same manner and the upper coil 7
By changing the current flowing in a and the lower coil 7b,
A correction action occurs in the lower area of the screen 12 in FIG.

The variable resistor 15a limits the current flowing through the diode 18a and the diode 18b, and the vertical line 24B, 2
Adjust the amount of convergence correction between 4R. Further, although illustration is omitted, the variable resistors are connected to the diodes 18c, 18
It is also possible to connect to the d side and adjust the convergence correction amount between the vertical lines 24B and 24R.

Further, as shown in FIG.
When correcting the misconvergence of the vertical lines 24B and 24R in the pattern opposite to that of (a), the diode 18 is used.
The forward conduction voltage may be low for c and 18d, and the forward conduction voltage may be high for the diodes 18a and 18b. As a result, the operating state is opposite to that described above, so that the pattern shown in FIG. 5B can be corrected.

FIG. 6 is an electric circuit diagram showing a second embodiment of the present invention. The parts corresponding to those of the embodiment shown in FIG. 1 are designated by the same reference numerals, and duplicated description will be omitted.

In this embodiment, diodes having the same forward conduction voltage characteristic are used to obtain the same effects as the above-mentioned embodiments. In order to make the operating voltage (forward conduction voltage characteristic) of the diode have a characteristic corresponding to that of the diode 18c described above, the diode 18c
-1, diode 18c-2 are connected in series, and in order to have characteristics corresponding to diode 18d, diode 1
8d-1 and diode 18d-2 are connected in series.
The series circuit of these two diodes is diode 18
It is equivalent to one diode operating at a forward voltage twice as high as the forward conduction voltage of a and 18b. It is also possible to adjust the operating voltage by connecting three or more diodes in series in order to obtain the optimum operating point.

This electric circuit can also realize the misconvergence correction by performing the same current control as that of the electric circuit described above.

FIG. 7 is an electric circuit diagram showing a third embodiment of the present invention. The parts corresponding to those in the above-described embodiment are designated by the same reference numerals, and overlapping description will be omitted.

In this embodiment, all the diodes 18a-18
The forward conduction voltage characteristics of d are the same, and a fixed resistor 14c for making the operating point of the diode different is connected between the connection points of the vertical deflection coil 3 and the fixed resistors 14a, 14b.

In this electric circuit, the diodes 18a, 1
The voltage applied to 8b is higher than the voltage applied to the diodes 18c and 18d by the voltage drop generated in the fixed resistor 14c. Therefore, the diode 18
The diodes a and 18b operate faster than the diodes 18c and 18d, and even if diodes having the same forward conduction voltage are used, the same correction action as that of the first embodiment can be obtained.

In this embodiment, the diodes 18a and 18b are
Since the voltage applied to the diodes 18c and 18d is different, the voltage is not limited to the illustrated circuit configuration, and the voltage generated in the fixed resistors 14a and 14b is divided and applied to the diodes 18c and 18d. However, the same correction can be performed.

FIG. 8 is an electric circuit diagram showing a fourth embodiment of the present invention. The parts corresponding to those in the above-described embodiment are designated by the same reference numerals, and overlapping description will be omitted.

Vertical deflection coil 3 and fixed resistors 14a, 1
Fixed resistors 14d, 14 connected between the connection points of 4b
The series-parallel circuit composed of e and the thermistor 16 is configured such that the combined resistance value thereof has a negative temperature coefficient by the action of the thermistor 16. The diode (semiconductor element) has a property that the forward conduction voltage characteristic changes with temperature change. The series-parallel circuit including the thermistor 16 changes the voltage applied to the diodes 18a to 18d according to the vertical deflection current Iv when the forward conduction voltage characteristics of the diodes 18a to 18d change due to temperature change. , It acts to keep the correction characteristic constant. The variable resistor 15b simply adjusts the current Ia flowing through the upper coil 7a and the current Ib flowing through the lower coil 7b into an unbalanced state, and corrects the cross-shaped vertical lines 24B and 24R shown in FIG. 5 (e). To be able to do.
The fixed resistors 14f and 14g are connected to the diodes 18
By limiting the current flowing through a to 18d, the vertical line 2
It is a resistor for optimizing the correction amounts of 4B and 24R.

FIG. 9 is an electric circuit diagram showing a fifth embodiment of the present invention. In addition, the same reference numerals are attached to the portions corresponding to the above-described embodiments, and the duplicated description will be omitted. In this embodiment, the diodes 18a and 18b are separated from each other, and the series circuit in which the diode 18a is connected in series with the variable resistor 15c is connected in parallel with the fixed resistor 14a, and the diode 18b is connected in series with the variable resistor 15d. The series circuit connected to is connected in parallel with the fixed resistor 14b.

As a result, the variable resistor 15c is displayed on the screen 12
The current flowing in the diode 18a operating in the region where the vertical deflection current Iv in the upper region of the
Since it can be controlled by c, the amount of convergence correction between the vertical lines 24B and 24R can be adjusted in the upper area of the screen 12 shown in FIG. Similarly, in the lower region of the screen 12, since the current flowing through the diode 18b can be controlled by the variable resistor 15d, between the vertical lines 24B and 24R in the lower region of the screen 12 shown in FIG. 5A. The amount of convergence correction can be adjusted. That is, the vertical lines 24B and 24 are independently formed in the upper and lower areas of the screen 12.
The amount of convergence correction between R can be adjusted.

Although not shown in the drawings, an electric circuit formed by replacing the diodes 18a and 18c and the diodes 18b and 18d with each other also changes the range of the upper and lower portions of the screen 12 where the convergence can be adjusted, but similarly. The convergence correction amount between the vertical lines 24B and 24R can be adjusted independently in the upper area and the lower area of the screen 12. Further, the connection point between the vertical deflection coil 3 and the resistor 14a and all the diodes 18a to 18d.
Variable resistors may be connected between the two, respectively. By doing so, finer convergence adjustment can be performed.

FIG. 10 is an electric circuit diagram showing a sixth embodiment of the present invention. The parts corresponding to the above-mentioned embodiments are designated by the same reference numerals and their duplicate description will be omitted.

This embodiment is largely different from the embodiment shown in FIG. 1 in that a first series circuit in which an upper coil 7a and a fixed resistor 14j are connected in series and a lower coil 7b and a fixed resistor 14i are connected in series. The second series circuit is connected in series.

Accordingly, the first series circuit and the second series circuit are connected.
And a diode bridge circuit composed of the diodes 18a to 18d is connected in parallel with the series circuit in which the series circuit is connected in series, and one of the output terminals of the diode bridge circuit,
The variable resistor 15 is provided between the connection points of the fixed resistors 14i and 14j.
e is connected, and the other output terminal of the diode bridge circuit and the connection point of the fixed resistors 14i and 14j are directly connected. Diodes 18a, 18b and diode 18
c and 18d are diodes having different forward conduction voltages. For example, the diodes 18a and 18b are the Schottky diodes having a low forward conduction voltage, the diodes 18c,
18d is a diode having a high forward conduction voltage with respect to the diodes 18a and 18b.

In this way, in the first half of the vertical deflection cycle, the vertical deflection current Iv flowing through the vertical deflection coil 3 flows in the direction of the arrow, the current Ia flows through the upper coil 7a, and the current Ib flows through the lower coil 7b. . In addition, the fixed resistor 14
i and 14j act so as to generate a voltage drop (potential difference) for conducting the diodes 18a to 18d.

In a region where the vertical deflection current Iv is small, the voltage drop generated in the fixed resistors 14i and 14j is small and only the diode 18a having a low forward conduction voltage is conductive.
Therefore, in this region, the current Ia flowing through the upper coil 7a
Is larger than the current Ib flowing through the lower coil 7b.
As a result, the vertical deflection magnetic field 20 has a shape as shown in FIG. 4A, and the blue electron beam 19B has a deflection force 21B inclined to the right, and the red electron beam 19R has a deflection inclined to the left. The force 21R acts. As a result, FIG.
A vertical line 24 near the center of the screen 12 shown in FIG.
B and 24R can be corrected in the same direction.

In a region where the vertical deflection current Iv is large, the voltage drop generated in the fixed resistors 14i and 14j becomes large, and the diode 18a having a low forward conduction voltage and the diode 18d having a high forward conduction voltage are also conducted. In this state, the current flowing through the diode 18d is
By setting it so as to be larger than the current flowing through 8a, the current Ib flowing through the lower coil 7b becomes larger than the current Ia flowing through the upper coil 7a. As a result, the vertical deflection magnetic field 20 has a shape as shown in FIG. 4B, and the blue electron beam 19B has a deflection force 21B that is inclined to the left, and the red electron beam 19R has a deflection that is inclined to the right. The force 21R acts. This makes it possible to correct the vertical lines 24B and 24R at the upper end portion of the screen 12 shown in FIG.

Similarly, in the lower area of the screen 12, since the vertical drive current Iv is in the opposite direction, the diodes 18b and 18c operate and the upper coil 7a and the lower coil 7 operate.
The lower area of the screen 12 in FIG. 5A can be corrected by changing the current flowing in b. Further, the variable resistor 15e can limit the current flowing through the diodes 18a and 18b and adjust the convergence correction amount between the vertical lines 24B and 24R.

Although illustration is omitted, the diode 18a and the diode 18c and the diode 18b and the diode 18d may be replaced with each other. In this case, the range of the upper and lower portions of the screen 12 where the convergence can be adjusted is changed. Similarly, the amount of convergence correction between the vertical lines 24B and 24R can be adjusted.

FIG. 11 is an electric circuit diagram showing a seventh embodiment of the present invention. The parts corresponding to those in the above-described embodiment are designated by the same reference numerals, and overlapping description will be omitted.

The diode 18a is connected to the connection point between the fixed resistor 14j and the upper coil 7a via the variable resistor 15g, and the diode 18b is connected to the connection point between the upper coil 7b and the fixed resistor 14i via the variable resistor 15f. Connected. Since the current flowing in the diode 18a operating in the upper area of the screen 12 can be controlled by the variable resistor 15g, the current flowing through the diode 18a in FIG.
Vertical lines 24B and 24R in the upper area of the screen 12 shown in (a)
It is possible to adjust the amount of convergence correction between them. Similarly, in the upper region of the screen 12, since the current flowing through the diode 18b can be controlled by the variable resistor 15f, the vertical line 24 in the lower region of the screen 12 shown in FIG.
The amount of convergence correction between B and 24R can be adjusted. That is, the convergence correction amount between the vertical lines 24B and 24R can be independently adjusted in the upper area and the lower area of the screen.

Although not illustrated, the diode 18
Even if the variable resistors 15f and 15g are connected to the c and 18d sides, independent adjustment can be similarly performed in the upper and lower regions of the screen 12.

The diodes 18a to 18d use diodes having the same forward conduction voltage. However,
The diodes 18a and 18b include two fixed resistors 14
Since the voltage drops generated in i and 14j act in addition, the voltage drops generated in one fixed resistor 14i and 14j conduct faster than the independently acting diodes 18c and 18d, so that different operating points are obtained. Becomes

In each of the embodiments described above, the sub-core 6a,
The shape of 6b is U-shaped, but any sub-core capable of generating four magnetic poles as shown in FIG. 4 (a) may be round, left-right E-shape, upper-lower E-shape or the like. , A convergence correction effect equivalent to that of the U-shaped sub core can be obtained.

FIG. 12 is a block diagram of a display device using the color cathode ray tube 11 to which the deflection yoke 1 as in the above-mentioned embodiment is attached. This display device includes a video circuit 30, a horizontal deflection circuit 31, a vertical deflection circuit 32, and a high voltage circuit 33.

The video circuit 30 has a video signal input terminal 27.
Control the electron gun 9 according to the video signal input from
The horizontal deflection circuit 31 generates a horizontal deflection current I _H generated according to the horizontal synchronization signal input from the horizontal synchronization signal input terminal 28.
Is supplied to the horizontal deflection coil 2, and the vertical deflection circuit 32 generates a vertical deflection current I _V generated according to the vertical synchronization signal input from the vertical synchronization signal input terminal 29.
And the auxiliary coils 7a and 7b, and the high voltage circuit 33 uses the high voltage generated by utilizing the horizontal synchronizing signal to generate color cathode ray tube 1
1 to control the electron beam generated in the color cathode ray tube 11.

The display device thus constructed has less misconvergence.

[0053]

According to the present invention, it is possible to reduce the residual misconvergence by correcting vertical line misconvergence in opposite directions at both ends of the central area and the upper and lower areas of the screen.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a side view showing a color cathode ray tube having a deflection yoke according to the present invention.

FIG. 3 is a rear view of the deflection yoke according to the present invention as viewed from the rear side.

FIG. 4 is a diagram showing a vertical deflection magnetic field by a vertical deflection auxiliary coil of the deflection yoke according to the present invention.

FIG. 5 is a diagram showing a convergence pattern for explaining the operation of the deflection yoke according to the present invention.

FIG. 6 is an electric circuit diagram showing a second embodiment of the present invention.

FIG. 7 is an electric circuit diagram showing a third embodiment of the present invention.

FIG. 8 is an electric circuit diagram showing a fourth embodiment of the present invention.

FIG. 9 is an electric circuit diagram showing a fifth embodiment of the present invention.

FIG. 10 is an electric circuit diagram showing a sixth embodiment of the present invention.

FIG. 11 is an electric circuit diagram showing a seventh embodiment of the present invention.

FIG. 12 is a block diagram of a display device including a deflection yoke according to the present invention.

[Explanation of symbols]

1 ... Deflection yoke, 2 ... Horizontal deflection coil, 3 ... Vertical deflection coil, 4 ... Main core, 6a, 6b ... Sub core, 7a ... Vertical deflection upper auxiliary coil (upper coil), 7b ... Vertical deflection lower auxiliary coil ( Lower coil), 9 ... Electron gun, 14a, 14
b ... Fixed resistor, 15a ... Variable resistor, 18a-18d
…diode.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noritaka Okuyama 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Multimedia system development headquarters (72) Inventor Soichi Sakurai Yoshida, Totsuka-ku, Yokohama, Kanagawa 292, Machi, Ltd. Hitachi, Ltd., Multimedia Systems Development Division (72) Inventor, Hiroshi Yoshioka, 3300 Hayano, Mobara, Chiba Prefecture, Ltd., Electronic Devices Division, Hitachi, Ltd. (72), Atsushi Takeyama, Masazawa, Mizusawa, Iwate Prefecture Kitano No. 1 Hitachi Media Electronics Co., Ltd.

Claims (11)

[Claims] 1. A horizontal deflection coil and a vertical deflection coil are provided,
In a deflection yoke attached to a color cathode ray tube equipped with an electron gun for generating an in-line array of multiple electron beams, a vertical auxiliary coil provided on the electron gun side of the deflection yoke and connected in series with the vertical deflection coil is provided. The vertical auxiliary coil includes a first auxiliary coil in which a first resistor is connected in series and a second auxiliary coil in which a second resistor is connected in series.
Auxiliary coil, and two kinds of diode circuits having different forward conduction voltage characteristics are respectively connected to the first and second resistors in an anti-parallel relationship, and the first and second resistors are bypassed. The deflection yoke is characterized in that the current flowing through the first and second auxiliary coils is changed according to the direction and magnitude of the vertical deflection current. 2. The diode circuit according to claim 1, wherein the diode circuit increases the current flowing through the first auxiliary coil in a region where the vertical deflection current in one direction is small and also increases the current flowing through the second auxiliary coil in a large region. The deflection yoke is characterized in that the current flowing through the second auxiliary coil is increased in a region where the vertical deflection current in the other direction is small and the current flowing through the first auxiliary coil is increased in a region where the vertical deflection current is large. . 3. A horizontal deflection coil and a vertical deflection coil are provided,
A deflection yoke attached to a color cathode ray tube having an electron gun for generating an in-line array of multiple electron beams, comprising a vertical auxiliary coil provided on the electron gun side of the deflection yoke and connected in series with the vertical deflection coil. The vertical auxiliary coil includes a first auxiliary coil in which a first resistor is connected in series and a second auxiliary coil in which a second resistor is connected in series.
An auxiliary coil for the first resistor, and the first resistor is brought into conduction with a relatively small voltage drop due to a vertical deflection current in one direction and a relatively large voltage drop due to a vertical deflection current in the other direction. A second diode, which is in a conductive state, is connected in parallel, and a third diode, which is in a conductive state with a relatively small voltage drop due to a vertical deflection current in the other direction, is connected to the second resistor in a vertical drive in one direction. A deflection yoke characterized in that a fourth diode, which is rendered conductive by a relatively large voltage drop due to a current, is connected in parallel, and the current flowing through each diode increases the current flowing through the auxiliary coil. 4. A deflection yoke according to claim 3, wherein variable resistors are connected in series to said first and third diodes. 5. The deflection yoke according to claim 4, wherein the variable resistor is commonly connected to the first and third diodes. 6. The deflection yoke according to claim 4, wherein the variable resistor is provided so as to be separately and independently connected to the first and second diodes. 7. A horizontal deflection coil and a vertical deflection coil are provided,
A deflection yoke attached to a color cathode ray tube having an electron gun for generating an in-line array of multiple electron beams, comprising a vertical auxiliary coil provided on the electron gun side of the deflection yoke and connected in series with the vertical deflection coil. The vertical auxiliary coil includes a first auxiliary coil in which a first resistor is connected in series and a second auxiliary coil in which a second resistor is connected in series.
And an auxiliary coil for connecting the diode circuit so as to establish an antiparallel relationship with the first and second resistors and to apply a different voltage to the vertical deflection current, and bypass the first and second resistors. The deflection yoke is characterized in that the current flowing through the first and second auxiliary coils is changed according to the direction and magnitude of the vertical deflection current. 8. The diode circuit according to claim 7, wherein the diode circuit increases the current flowing through the first auxiliary coil in a region where the vertical deflection current in one direction is small, and flows through the second auxiliary coil in a region where the vertical deflection current is large. The current is also increased, and the current flowing through the second auxiliary coil is increased in the region where the vertical deflection current in the other direction is small and the current flowing through the first auxiliary coil is increased in the region where the vertical deflection current is large. And deflection yoke. 9. The first auxiliary coil having the first resistor connected in series and the second auxiliary coil having the second resistor connected in series are connected in series. A deflection yoke characterized in that it is connected in a relationship. 10. A color cathode ray tube device for generating a multi-electron beam in an in-line arrangement, comprising the deflection coil according to claim 1. 11. A display device comprising the color cathode ray tube device according to claim 10.