JP3326348B2 - Deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke mounted on a color picture tube having an in-line type electron gun, and more particularly to a self-convergence type deflection yoke.

[0002]

2. Description of the Related Art Conventionally, in a color picture tube for a monitor, both a horizontal deflection coil and a vertical deflection coil of a deflection yoke are wound in a saddle shape. As a winding method of the saddle coil, after winding a copper wire into a gap portion of a mold, a copper wire is pressed into a gap portion by a jig and molded to obtain a predetermined shape. There is known a slit winding method in which a copper wire is wound around a formed groove (slit) to obtain a predetermined shape.

According to the mold winding method, since the shape of the coil is determined by the mold, the inner surface of the coil can be formed so as to be along the outer peripheral surface of the picture tube without any gap. And a design that minimizes the outer diameter of the vertical deflection coils, as well as the ferrite cores placed around these coils. As a result, the electron beam can be deflected with relatively small power, and the deflection power is reduced.

On the other hand, according to the slit winding method, a copper wire is wound around a groove of a bobbin, so that the copper wire is not disturbed in a winding process and a predetermined winding distribution can be accurately realized. . As a result, a predetermined magnetic field is formed when the electron beam is deflected, and high-quality image is obtained.

[0005]

In the case of a color picture tube for a monitor in particular, since the demand for image quality is severe, it is desirable to employ a slit winding method for the deflection yoke. However, in the slit winding method, the copper wire does not move between the adjacent winding grooves,
Since it is necessary to form partition walls of sufficient height on both sides of the winding groove, the outer diameter of the bobbin increases accordingly, and the ferrite core increases in diameter, increasing the deflection power. was there. Also, self-convergence,
Without the use of other auxiliary devices, the deflection yoke itself allows the three electron beams to be applied to all areas on the screen in one.
In order to focus on a point, the horizontal deflection coil must be wound over as large an angular range as possible, and as a result, the horizontal deflection coil and the vertical deflection coil are partially overlapped in the circumferential direction. (Japanese Utility Model Application Laid-Open No. 59-5867,
No. 225045). Due to this overlapping portion, the outer diameter of the deflection yoke is increased, and the deflection power is increased.

A deflection yoke in which a horizontal deflection coil and a vertical deflection coil are arranged at substantially the same radial position from the tube axis has been proposed (Japanese Utility Model Laid-Open No. 62-144053). Because the range of winding angle is limited, when equipped on a color picture tube equipped with an in-line type electron gun,
Self-convergence cannot be realized.

It is an object of the present invention to suppress an increase in deflection power, which is a drawback of slit winding, in a self-convergence type deflection yoke employing slit winding.

[0008]

The deflection yoke according to the present invention comprises a horizontal deflection coil (3) for generating a horizontal deflection magnetic field and a vertical deflection coil (4) for generating a vertical deflection magnetic field.
The bobbin (1) on which the horizontal deflection coil (3) is to be wound has upper and lower inner winding areas close to the horizontal plane and outer left and right winding areas far from the horizontal plane, respectively, above and below a horizontal plane including the tube axis. The first coil portion (L1, L1) is provided by winding around the left inner winding region and the right outer winding region.
L3) is formed, and the second coil portion (L2, L4) is formed by winding around the left outer winding region and the right inner winding region. The first coil unit (L1, L3) and the second coil unit (L2, L4) are connected in parallel with each other, and both coil units have currents for differentially changing the current flowing in both coil units. Control means is connected.

More specifically, the current control means winds a coil around each of a pair of cores to which a magnetic bias is applied, and in these coils, the magnetic direction of one of the coils matches the magnetic bias direction of the core. A saturable reactor connected in series such that the magnetic direction of the other coil is opposite to the magnetic bias direction of the core, and the first coil portions (L1, L3) and the Two coil portions (L2, L4) are connected, and a lead wire for current input / output extends from a connection point between the two coils.

In the deflection yoke according to the present invention, for example, when the electron beam is deflected to the left of the screen,
By the operation of the current control means, the first coil section (L1, L1
3), the current flowing through the second coil portion (L
2, L4) increases. Here, since the second coil portion (L2, L4) is wound around the left outer winding region and the right inner winding region, the winding of the left outer winding region and the right inner winding region is performed. A magnetic field equivalent to the case where the number of windings is increased from the actual number of windings will be formed.
The range of the winding angle of the horizontal deflection coil is enlarged, and a convergence equal to or better than the deflection yoke partially overlapping the vertical deflection coil can be obtained.

Conversely, when deflecting the electron beam to the right of the screen, the current flowing in the first coil units (L1, L3) increases and the second coil units (L2, L4) ) Reduces the current flowing through it. Here, since the first coil portions (L1, L3) are wound around the left inner winding region and the right outer winding region, the first coil portion (L1, L3) is wound around the left inner winding region and the right outer winding region. A magnetic field equivalent to the case where the number of wires is larger than the actual number of windings is formed, thereby expanding the winding angle range of the horizontal deflection coil and increasing the deflection yoke partially overlapping the vertical deflection coil. Equal or better convergence can be obtained.

Therefore, in the deflection yoke of the present invention, even when the horizontal deflection coil (3) and the vertical deflection coil (4) are arranged at the same or substantially the same radial position without overlapping each other in the circumferential direction. The self-convergence described above is realized, and this arrangement can reduce the diameter of the entire deflection yoke. As a result, the deflection power is reduced.

A first coil part (L1) and a second coil part (L2) arranged on the horizontal plane, and a first coil part (L3) and a second coil part arranged on the horizontal plane. (L
If it is necessary to adjust the convergence by changing the ratio of the current flowing through 4), these coil sections are connected as follows. That is, the first coil part (L1) and the second coil part (L2) arranged on the horizontal plane are connected in parallel with each other, and the first current control means is connected to both coil parts, The first coil section (L
3) and the second coil unit (L4) are connected in parallel with each other,
Second current control means is connected to both coil portions. Then, a balance coil is connected to the input / output terminals of the first current control means and the second current control means.

On the other hand, when the convergence adjustment by the balance coil is unnecessary, the pair of first coil portions (L1, L3) arranged above and below the horizontal plane are connected in series with each other, and A pair of second coil units (L2, L4) arranged above and below the horizontal plane are connected in series with each other, and the first coil unit (L1, L3) and the second coil unit
One current control means is connected to (L2, L4).

[0015]

In the deflection yoke according to the present invention, the four coil portions (L1 to L4) of the horizontal deflection coil are wound asymmetrically left and right and the currents flowing through these coil portions are changed differentially. Thereby, self-convergence is realized, so that the horizontal deflection coil and the vertical deflection coil can be arranged at the same or substantially the same radial position without overlapping each other in the circumferential direction. Thus, the diameter of the entire deflection yoke can be reduced, and the deflection power can be reduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. As shown in FIG. 1, the deflection yoke according to the present invention has a horizontal deflection coil (3) on the left and right and a vertical deflection coil (4) on the upper and lower sides with respect to the tube axis (Z axis) of the electron gun. The horizontal deflection coil (3) is wound around a winding groove (not shown) of the horizontal deflection coil bobbin (1), and the vertical deflection coil (4) is wound around a winding groove (not shown) of the vertical deflection coil bobbin (2). ), And each is formed in a saddle shape. A ferrite core (6) is disposed around the horizontal deflection coil bobbin (1) and the vertical deflection coil bobbin (2). Here, the horizontal deflection coil (3) and the vertical deflection coil (4) are arranged at positions where the radial distances from the Z axis are substantially the same, without overlapping each other, and are provided with a collar having an in-line type electron gun. When mounted on a picture tube (not shown), the inner peripheral surfaces of both coils (3) and (4) are installed as close as possible to the outer peripheral surface of the picture tube.

The horizontal deflection coil (3) is vertically symmetrical with respect to the X axis extending horizontally, but is asymmetrically wound with respect to the Y axis extending vertically.
It is composed of The first coil portion L1 is disposed on the left side of the Z-axis and is close to the X-axis.
Outer first winding disposed to the right of the axis and remote from the X axis
(31). The second coil portion L2 is disposed on the left side of the Z axis and is remote from the X axis with an outer second winding (34).
Inner second winding disposed to the right of the Z axis and close to the X axis
(33). The first coil portion L3 is disposed on the left side of the Z-axis and is close to the X-axis.
Outer third winding located to the right of the axis and remote from the X axis
(35). The second coil portion L4 is disposed on the left side of the Z-axis and is farthest from the X-axis.
Inner fourth winding arranged to the right of the Z axis and close to the X axis
(37).

Outer first winding constituting first coil portion L1
(31) and the inner first winding (32) start winding from the lead wire (51) at the end of the outer first winding (31) far from the X axis, and
The winding is advanced in the direction of the arrow in the figure while circulating through the three winding regions, and the winding is terminated at the lead wire (53) at the end of the inner first winding (32) far from the X axis. I have. The inner second winding (33) and the outer second winding (34) constituting the second coil portion L2 are wound from a lead wire (52) at an end of the inner second winding (33) near the X axis. The wire is started and the winding is advanced in the direction of the arrow in the figure while circulating through the two winding areas, and the lead wire (54) at the end of the outer second winding (34) near the X axis is drawn. Ends the winding. Further, an outer third winding (35) constituting the first coil portion L3.
And the inner third winding (36) starts winding from a lead wire (56) at an end far from the X-axis of the outer third winding (35), while circulating through two winding regions, The winding is advanced in the direction of the arrow in the figure, and the winding ends at the lead wire (58) at the end of the inner third winding (36) far from the X axis. The inner fourth winding (37) and the outer fourth winding (38) constituting the second coil portion L4 are wound from a lead wire (55) at the end of the inner fourth winding (37) near the X axis. The wire is started and the winding is advanced in the direction of the arrow in the figure while circulating through the two winding areas, and the lead wire (57) at the end of the outer fourth winding (38) near the X axis is drawn. Ends the winding.

As shown in FIG. 2, one current input / output terminal
Four coil portions L1 to L4 are connected in parallel to (5), and the first coil portion L1 and the second coil portion L2 arranged on the X axis are connected to the first saturable reactor (71). A first coil portion L3 connected to both ends and arranged below the X-axis;
And the second coil unit L4 are connected to both ends of the second saturable reactor (72). Also, both saturable reactors (71) (7
The midpoint of 2) is connected to both ends of the balance coil 8, and the midpoint of the balance coil 8 is connected to the other current input / output terminal 50.

The two saturable reactors (71) and (72) are respectively
It has a well-known configuration for differentially changing the current flowing through the two connected coil units (see FIG. 59-5867,
61-70353), for example, the first saturable reactor (71)
Is a ferrite core composed of two core portions (70a) and (70b) magnetically biased in one direction as shown in FIG.
(L5, L6). Saturable reactor
(72) has the same configuration.

For example, when a magnetic bias in the direction shown by arrow B is applied to the two cores (70a) (70b),
In order to deflect the electron beam in one direction (leftward or rightward), a current flows through the coils (L5, L6) in the directions of the arrows, and the currents form magnetic fields opposite to each other as shown by the arrows C1, C2. If one of the cores (70
In (a), the two magnetic fields B and C1 are superimposed to increase the magnetic force, whereas in the other core portion (70b), the two magnetic fields B and C2 cancel each other and the magnetic force decreases. . here,
Since the saturable reactor (71) is used in the region A in which the magnetic permeability μapp has a gradient with respect to the bias magnetic force as shown in FIG. 5, the magnetic permeability μapp decreases in the one core portion (70a). On the other hand, the other core portion (70b) has a magnetic permeability μapp
Will increase. Even if the number of turns of the coil is the same, when the magnetic permeability increases, the inductance also increases. Therefore, the inductance of the one core portion (70a) decreases and the inductance of the other core portion (70b) increases. As a result, the current I1 flowing through the first coil unit L1 and the current I2 flowing through the second coil unit L2 change differentially, and in the case of the above example, the current I1 flowing through the first coil unit L1 increases and The current I2 flowing through the second coil unit L2 decreases.

On the other hand, when deflecting the electron beam in the opposite direction (rightward or leftward), the coils (L5, L5
In 6), a current flows in the opposite direction to the arrow, so that in one core (70a), the two magnetic fields cancel each other and the magnetic force decreases, whereas in the other core (70b), the two magnetic fields decrease. Are superimposed and the magnetic force increases. As a result, the current I1 flowing through the first coil unit L1 and the current I2 flowing through the second coil unit L2 change differentially, and the current I1 flowing through the first coil unit L1 decreases. The flowing current I2 increases.

With respect to the first coil portion L3 and the second coil portion L4 disposed below the X axis, the current flowing through the first coil portion L3 and the second coil portion L2 are also controlled by the same current control action of the saturable reactor (72). The current flowing through the coil section L4 changes differentially.

For example, as shown in FIG. 6, when the electron beam is deflected to the left, the current flowing through the second coil portions L2 and L4 increases and the current flowing through the first coil portions L1 and L3 decreases. . Here, the electron beam B for blue located at the left end is close to the inner first winding (32) and the inner third winding (36), so that the acting force in the X-axis direction received from these windings. Is relatively large, but the outer second winding (34)
And the acting force in the X-axis direction received from the outer fourth winding (38) is
The angle is relatively small due to the large angle between the X axis and the magnetic attraction force Fb2. On the other hand, for the red electron beam R located at the right end, the inner first winding (32) and the inner
Since they are far from the windings (36), the acting force in the X-axis direction received from these windings is relatively small, but the acting force in the X-axis direction received from the outer second winding (34) and the outer fourth winding (38) is small. The angle formed by the X axis and the magnetic attractive force Fr2 is small, and the current flowing through the outer second winding (34) and the outer fourth winding (38) increases differentially as described above. Therefore, the acting force in the X-axis direction becomes relatively large.

The outer first winding disposed on the right side of the Y axis
(31), the deflection force received from the inner second winding (33), the inner fourth winding (37) and the outer third winding (35) is also determined by the inner second winding.
(33) and the current flowing through the inner fourth winding (37) increase differentially, so that the red electron beam R
Larger deflection force acts on

As a result, the deflecting force acting on the electron beam B for blue located at the left end and the deflecting force acting on the electron beam R for red located at the right end are balanced, and good convergence is obtained. . When deflecting the electron beam to the right, the current flowing through the first coil units L1 and L3 increases and the current flowing through the second coil units L2 and L4 decreases. As a result, a force in the opposite direction acts on the electron beam B for blue and the electron beam R for red,
The deflection forces acting on both electron beams are balanced, and good convergence is obtained.

In FIG. 2, the balance coil (8)
Are a first coil unit L1 and a second coil unit L2 arranged above the X axis, and a first coil unit L3 arranged below the X axis.
In order to adjust the convergence by changing the ratio of the currents flowing through the second coil portion L4 and the second coil portion L4, when this convergence adjustment is not necessary, a pair of upper and lower X-axes are arranged as shown in FIG. The first coil portions L1 and L3 are connected in series with each other, and a pair of second coil portions L2 and L4 arranged above and below the X axis are connected in series with each other.
It is possible to adopt a configuration in which the coil units L1, L3 and the second coil units L2, L4 are connected to both ends of the saturable reactor (7).

FIGS. 7 to 11 show specific shapes of the horizontal deflection coil bobbin (1) and the vertical deflection coil bobbin (2) which constitute the deflection yoke of the present invention. As shown in FIG. 7, a bobbin (2) for a vertical deflection coil is arranged around a bobbin (1) for a horizontal deflection coil, and a ferrite core (6) is further installed around a bobbin (2) for a vertical deflection coil. I have.

As shown in FIGS. 8 and 9, the horizontal deflection coil bobbin (1) is provided with a flange piece (1) at the small-diameter end of the bobbin main body (11).
2) is attached to the bobbin main body (11), and a large-diameter crossover groove (17) is formed at the large-diameter end of the bobbin body (11), and a small-diameter crossover groove (18) is formed at the small-diameter flange piece (12). I have. The bobbin main body (11) is formed with a pair of recesses (19) (19) corresponding to the positions of the vertical deflection coils, and the vertical deflection coil bobbin (2) is engaged with the recesses. As shown in FIG. 11, an outer first winding (31), an inner first winding (32), and an inner first winding constituting the horizontal deflection coil (3) are provided on the inner peripheral surface of the bobbin body (11). A plurality of winding grooves for applying the second winding (33) and the outer second winding (34), i.e., an outer first groove region (2) including two winding grooves (13a) and (13b). 1
3) The inner first groove region (1) consisting of two winding grooves (14a) (14b)
4) The inner second groove area (1) consisting of two winding grooves (15a) (15b)
5), and an outer second groove region (16) composed of two winding grooves (16a) (16b) are formed symmetrically above and below the X axis.

As shown in FIGS. 9 and 10, a bobbin (2) for a vertical deflection coil is provided at a small-diameter end of a bobbin body (21) with a flange piece.
(22) is attached to the bobbin body (21), a large-diameter side crossover portion (24) is formed at the large-diameter side end, and a small-diameter side crossover portion (25) is formed at the small-diameter side flange piece (22). ing. The bobbin body (21) has a pair of windows (26) (26) corresponding to the positions of the horizontal deflection coils. Also, on the inner peripheral surface of the bobbin main body (21), FIG.
As shown in the figure, a groove area including a plurality of winding grooves (23a) (23b) (23c) (23d) for winding the above-described vertical deflection coil (4).
(23) and (23) are formed symmetrically above and below the Z axis. In the winding step of the horizontal deflection coil (3), winding is applied to the outer first groove region (13) and the inner first groove region (14) to form the first coil portions L1 and L3, and Second groove area (15)
And winding the outer second groove region (16) to form a second coil portion L
2, L4 is formed.

More specifically, the first coil portion L1 of the horizontal deflection coil (3) is formed by firstly forming the winding groove (13a) of the first groove region (13) from the smaller diameter side of the horizontal deflection coil bobbin (1). After winding to the inside first groove area (1) via the large diameter side crossover groove (17)
4) Winding in the winding groove (14a), then through the small diameter side bridging groove (18), winding in the winding groove (13b) in the outer first groove area (13), It is formed by winding through the winding groove (14b) of the inner first groove region (14) via the large-diameter crossover groove (17). The second coil portion L2 of the horizontal deflection coil (3) is first wound in the winding groove (15a) of the inner second groove region (15) from the small diameter side of the horizontal deflection coil bobbin (1), Large diameter crossover groove
(17), the wire is wound in the winding groove (16a) in the outer second groove area (16), and then the inner second groove area (18) through the smaller diameter bridging groove (18).
The winding groove (16b) of the outer second groove region (16) is wound through the winding groove (15b) of the groove region (15), and further through the large diameter side crossover groove (17).
Formed by winding the wire. Vertical deflection coil
The winding path of (4) is the same as the conventional one.

According to the deflection yoke, the horizontal deflection coil
Since good convergence can be obtained by winding (3) asymmetrically about the Y axis and equipping a saturable reactor, as shown in FIG. 1, a horizontal deflection coil (3) and a vertical deflection coil (4) are obtained. Can be formed in a minimum winding angle range that does not overlap each other, and both coils can be arranged at the same radial position. Therefore, it is possible to design such that the outer diameter of the horizontal deflection coil and the vertical deflection coil and the outer diameter of the ferrite core disposed around these coils are minimized. As a result, the electron beam can be deflected with relatively small power, and the deflection power is reduced.

The description of the above embodiments is for the purpose of explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof.
In addition, the configuration of each part of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims. For example, an auxiliary coil (not shown) for fine adjustment of deflection characteristics can be wound around the small-diameter flange piece (12) of the horizontal deflection coil bobbin (1) as necessary. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a deflection yoke according to the present invention.

FIG. 2 is a circuit diagram showing a connection state of the deflection yoke and a connection state of a saturable reactor.

FIG. 3 is a circuit diagram illustrating another connection example according to the first embodiment;

FIG. 4 is a diagram illustrating the operation of a saturable reactor.

FIG. 5 is a graph showing a change in magnetic permeability in a saturable reactor.

FIG. 6 is a diagram for explaining the acting force on an electron beam of a horizontal deflection coil.

FIG. 7 is a side view showing an assembled state of a deflection yoke from which coils are omitted.

FIG. 8 is a diagram illustrating the shape of the end surface on the small diameter side of the bobbin for a horizontal deflection coil.

FIG. 9 is a side view showing a disassembled state of the deflection yoke from which coils are omitted.

FIG. 10 is a side view showing a disassembled state of a bobbin for a vertical deflection coil and a ferrite core.

FIG. 11 is an enlarged view showing a plurality of winding grooves on a small-diameter side end face of the bobbin for the horizontal deflection coil and the bobbin for the vertical deflection coil.

[Explanation of symbols]

 (1) bobbin for horizontal deflection coil (2) bobbin for vertical deflection coil (3) horizontal deflection coil (31) outer first winding (32) inner first winding (33) inner second winding (34) outer Second winding (4) Vertical deflection coil (6) Ferrite core (7) Saturable reactor (71) Saturable reactor (72) Saturable reactor

Claims (5)

(57) [Claims] 1. A deflection yoke mounted on a color picture tube having an in-line type electron gun, comprising: a horizontal deflection coil (3) for generating a horizontal deflection magnetic field; and a vertical deflection coil (4) for generating a vertical deflection magnetic field. And the bobbin (1) on which the horizontal deflection coil (3) is to be wound, respectively, above and below a horizontal plane including the tube axis.
The left and right inner winding areas close to the horizontal plane, and the left and right outer winding areas far from the horizontal plane are provided, and the left inner winding area and the right outer winding area are circulated to perform winding. The first coil portions (L1, L3) are formed, and the second coil portions (L2, L4) are formed by winding around the left outer winding region and the right inner winding region. ,
First coil part (L1, L3) and second coil part (L2, L4)
Are connected in parallel with each other, and current control means for differentially changing the current flowing through both coil portions is connected to both coil portions. 2. A horizontal deflection coil (3) and a vertical deflection coil.
The deflection yoke according to claim 1, wherein (4) is arranged at the same or substantially the same radial position without overlapping each other in the circumferential direction. 3. The current control means winds a coil around each of a pair of cores to which a magnetic bias is applied, and when the magnetic direction of one of the coils coincides with the magnetic bias direction of the core. A saturable reactor connected in series so that the magnetic direction of the other coil is opposite to the magnetic bias direction of the core, and a first coil section (L1, L3) and a second coil section at both ends of both coils. (L
The deflection yoke according to claim 1 or 2, wherein a lead wire for inputting / outputting a current extends from a connection point between the two coils. 4. A first coil section (L1) and a second coil section (L2) arranged on the horizontal plane are connected in parallel with each other, and a first current control means is connected to both coil sections. The first coil part (L3) and the second coil part (L4) arranged below the horizontal plane are connected in parallel with each other, and the second current control means is connected to both coil parts. The deflection yoke according to claim 1. 5. A pair of first coil units (L1, L3) arranged above and below the horizontal plane are connected in series with each other, and a pair of second coil units arranged above and below the horizontal plane.
(L2, L4) are connected in series with each other, and the first coil unit
The deflection yoke according to any one of claims 1 to 3, wherein one current control means is connected to (L1, L3) and the second coil part (L2, L4).