JPH0728786Y2 - Deflection-yoke device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a deflection yoke device mounted on a cathode ray tube such as a television receiver or a CRT display device.

[Prior art]

In general, the deflection yoke device is of a type in which a saddle-shaped horizontal deflection coil is provided on the inner surface side of the core via a coil bobbin, and a toroidal vertical deflection coil wound in a toroidal shape is provided on the core, and an inner surface side of the core. A type in which a saddle-shaped horizontal deflection coil and a saddle-shaped vertical deflection coil are provided via a coil bobbin is known, and in any of the forms, a horizontal deflection coil and a vertical deflection coil are provided along the longitudinal direction of the core. Is provided to generate a horizontal deflection magnetic field and a vertical deflection magnetic field in the orthogonal direction.

A deflection yoke device mounted on a color cathode ray tube having three electron beams in an in-line arrangement to deflect the electron beam is configured such that the horizontal deflection coil as a whole serves as a pincushion magnetic field and the vertical deflection coil serves as a barrel magnetic field. By doing so, theoretically, the misconvergence can be brought close to zero. However, in reality, it is difficult to obtain theoretical characteristics from the structure of the cathode ray tube and the structure of the deflection yoke device, and in reality, various modes of misconvergence occur.

Therefore, in the conventional technique, a magnetic piece is attached and adhered to the coil bobbin that constitutes the deflection yoke device, and the deflection magnetic field is partially made into a barrel magnetic field or a pincushion magnetic field, thereby preventing misconvergence on the screen. A method of fine-tuning at a specific place is adopted.

As described above, the method of partially or locally correcting the misconvergence using the magnetic piece is advantageous in that it is a simple method and can be applied to various correction modes.

[Problems to be solved by the invention]

However, since the magnetic piece is used as described above, it is possible to locally bend the magnetic field, but it is not possible to gradually create the magnetic field. In particular, it is not possible to make the magnetic field in the middle part of the coil a barrel magnetic field. It was difficult.

The present invention has been made in view of the above-mentioned problems of the prior art. By using a magnetic field distribution, which cannot be achieved only by a horizontal deflection coil that generates a pincushion magnetic field, by using a toroidally wound correction coil in combination, An object of the present invention is to provide a deflection yoke device capable of surely correcting misconvergence at a desired place.

[Means for solving problems]

In order to solve the above problems, the deflection yoke device of the present invention is provided with a core, a pair of paddle-shaped horizontal deflection coils provided along the longitudinal direction of the core, and the longitudinal direction of the core. In a deflection yoke device comprising a pair of toroidal type or saddle type vertical deflection coils, the core has a portion where left and right winding parts are close to the winding direction of the horizontal deflection coil and the vertical deflection coil. A correction coil wound so that a part or the whole thereof has a V-shape having a portion spaced apart from each other is provided, and the correction coil is connected in series with the horizontal deflection coil.

[Action]

With the above configuration, the correction coil flows with respect to the winding direction of the horizontal deflection coil with respect to the direction in which a part or all of the correction coil is wound in a V shape and the horizontal deflection current flowing through the horizontal deflection coil. Depending on the direction of the horizontal deflection current, the characteristics of the horizontal deflection magnetic field can be partially or locally changed to the barrel magnetic field or the pincushion magnetic field. Then, by appropriately setting the inclination direction when the correction coil is wound, and the direction in which the horizontal deflection current flows in the correction coil, the magnetic field distribution of the horizontal deflection coil is adjusted to a barrel magnetic field or a pincushion magnetic field, The screen characteristics can be corrected.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 7 show a first embodiment of the present invention.

In the drawing, reference numeral 1 denotes a core formed by joining a pair of semi-annular core members, and a pair of paddle-shaped horizontal deflection coils 2 and 3 are arranged on the inner surface side of the core 1 along the front-rear direction. Toroidal vertical deflection coils 4 and 5 are wound around the core 1 along the front-rear direction. Reference numeral 6 is a coil bobbin disposed on the inner surface side of the core 1, and the coil bobbin 6 holds the horizontal deflection coils 2 and 3 and secures insulation between the horizontal deflection coils 2 and 3 and the vertical deflection coils 4 and 5. is doing.

Further, 7 is an upper correction coil which is located on the outer circumference of the vertical deflection coil 4 and is wound around the core 1 in a toroidal manner, and 8 is located on the outer circumference of the vertical deflection coil 5, which is a lower side which is wound around the core 1 in a toroidal manner. A correction coil is shown, and in the present embodiment, the upper correction coil 7 and the lower correction coil 8 are wound in the same state, but these correction coils 7 and 8 are wound on the left winding portion 7A, respectively. It is composed of 8A and right winding parts 7B and 8B.

Then, the upper side correction coil 7 has the left and right winding parts 7A, 7A.
The left and right windings are arranged so that B is located in the peripheral portion of the vertical deflection coil 4 on the front end side (screen side), and on the apex of the vertical deflection coil 4 on the rear end side (neck portion side). Part 7
All of A and 7B are wound so as to be inclined in a "H" shape so as to have a portion close to each other and a portion separated from each other, and intersect with the winding directions of the horizontal deflection coil 2 and the vertical deflection coil 4 as a whole. As described above, they are in a non-parallel state, that is, in a state of approaching and separating in the left and right directions. Similarly, the lower correction coil 8 is also wound so that all of the winding portions 8A and 8B are tilted in a “C” shape so that the winding portions 8A and 8B are close to and away from each other, and the horizontal deflection coil 3 and the vertical deflection coil 5 are wound as a whole. It is in a non-parallel state so as to intersect with the line direction, that is, in a state of approaching and separating in the left and right directions.

In addition, an insulating copper wire or a coated copper wire having a predetermined wire diameter is used as each of the correction coils 7 and 8, and each winding portion 7A, 7B, 8A, 8B is wound by a predetermined number of turns (for example, 3 to 10 turns). ing.

Furthermore, the horizontal deflection coils 2 and 3 and the correction coils 7 and 8 are
As shown in FIG. 7 (a), they are connected in series so as to pass horizontal deflection currents in the same direction, or as shown in FIG. 7 (b), they are connected in series in opposite directions so as to pass horizontal deflection currents. As will be described later, it is selected according to the distribution of the horizontal deflection magnetic field. The correction coils 7 and 8 may be connected in parallel as shown, or may be connected in series.

The present embodiment is configured in this way, and its operation will be described next.

First, since the correction coils 7 and 8 are toroidally wound around the core 1 like the vertical deflection coils 4 and 5, the correction coils 7 and 8 change the characteristics of the horizontal deflection magnetic field H _B. .

This situation will be examined below.

First, a coil toroidally wound around the core 1 (this coil is not a coil having a “C” shape like the correction coils 7 and 8, but a horizontal deflection coil 2 and a vertical deflection coil 4 and 5). It is better to think of it as a coil wound in parallel to the line direction, but for the sake of convenience, this coil will be described below as the correction coils 7 and 8) and the horizontal deflection coils 2 and 3 are shown in FIG. It is assumed that horizontal deflection currents in the directions shown, that is, horizontal deflection currents in the same direction, flow in the horizontal deflection coils 2 and 3 and the core inner coil portions of the correction coils 7 and 8.

In this case, the characteristics of the horizontal deflection magnetic field H _B are as shown in FIG. 4 depending on the positions of the correction coils 7 and 8. That is, FIG. 4 shows the characteristics of the horizontal deflection magnetic field when the correction coils 7 and 8 are moved around the core 1. The pincushion magnetic field P is generated in the range of the predetermined angle θ ₁ from the X axis, and Similarly, the pincushion magnetic field P is obtained in the range of the predetermined angle θ ₃ from the Y axis, the barrel magnetic field B is obtained in the range of the predetermined angle θ ₂ located between these angles θ ₁ and θ ₃ , and the barrel magnetic field B is obtained at a certain angle position. Reaches the peak value and the angle θ ₁ from the X-axis
It was found that the positions 9 and 9 and the positions 10 and 10 at the angle θ ₃ from the Y-axis are the balance positions where the pincushion magnetic field P and the barrel magnetic field B compete with each other. It has been confirmed by experiments that the angle θ ₁ is 15 to 20 degrees and the angle θ ₃ is 10 to 15 degrees.

On the other hand, the correction coils 7 and 8 and the horizontal deflection coils 2 and 3 have horizontal deflection currents in the directions shown in FIG.
It is assumed that the horizontal deflection current in the opposite direction has flown between 3 and the coil inside coil of the correction coils 7 and 8. In this case, the correction coil
As shown in FIG. 6, the characteristic of the horizontal deflection magnetic field H _B due to 7, 8 is that the barrel magnetic field B and the pincushion magnetic field P have exactly the opposite relationship as compared with the characteristic of FIG.

Thus, in the case where the correction coils 7 and 8 according to the present embodiment are formed in the "C" shape shown in FIG. 1 and the horizontal deflection current in the direction shown in FIG. The horizontal deflection magnetic field H _B of the horizontal deflection coils 2 and 3 becomes a weak pincushion magnetic field P or a weak or medium barrel magnetic field B at the rear end side of the correction coils 7 and 8, and becomes a strong barrel magnetic field B at the intermediate portion. The weak pincushion magnetic field P or the weak barrel magnetic field B is generated on the front end side.

When a horizontal deflection current in the direction shown in FIG. 5 is passed through the correction coils 7 and 8, the horizontal deflection magnetic field H _B is
A weak barrel magnetic field B or a weak or medium pincushion magnetic field P is formed on the rear end side of the 8, a strong pincushion magnetic field P is formed on the intermediate part, and a weak barrel magnetic field B or a weak pincushion magnetic field P is formed on the front end side.

As described above, in the present embodiment, the correction coils 7 and 8 are wound in a “C” shape that spreads toward the front end side,
The horizontal deflection magnetic field having the above-mentioned characteristics can be obtained according to the direction of the horizontal deflection current, and the magnetic field distribution of the horizontal deflection coils 2 and 3 is assisted, and the horizontal deflection coils 2 and 3 cannot be used for correction. Misconvergence can be partially or locally corrected.

Next, FIGS. 8 to 10 show second to fourth embodiments of the present invention, in which the same components as those of the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

However, in the second embodiment shown in FIG. 8, the correction coils 17 and 18 are wound while being inclined in a "H" shape that widens toward the front end side, contrary to the first embodiment. .

With this structure, when a horizontal deflection current is applied to the correction coils 17 and 18 in the direction shown in FIG.
H _B becomes a weak pincushion magnetic field P or a weak barrel magnetic field B on the rear end side of the correction coils 17 and 18, a strong barrel magnetic field B on the middle part, and a weak pincushion magnetic field P or a weak or medium barrel on the front end side. It becomes the magnetic field B.

When a horizontal deflection current is passed through the correction coils 17 and 18 in the direction shown in FIG. 5, the horizontal deflection magnetic field H _B becomes a weak barrel magnetic field B or a weak pincushion magnetic field P on the rear end side of the correction coils 17 and 18. , The intermediate portion has a strong pincushion magnetic field P, and the front end side has a weak barrel magnetic field B or a weak or intermediate pincushion magnetic field P.

Thus, also in this embodiment, the misconvergence can be partially or locally corrected as in the first embodiment.

The third embodiment shown in FIG. 9 is characterized in that the correction coil
Each of the winding portions 27A (28A) and 27B (28B) of 27 and 28 is wound so that the front side and the rear side are formed in a "C" shape, respectively, and the winding portions 27A (28A) and 27B (28B). In the middle part of each of the correction coils 27 and 28, the windings 27A (28A) and 27B of the correction coils 27 and 28 are wound while being inclined so as to be bent in the shape of a dogleg.
(28B) is formed in an "X" shape as a whole so as to have a portion close to and a portion separated from each other.

With this configuration, when a horizontal deflection current in the direction shown in FIG.
H _B has a weak pincushion magnetic field P or a weak barrel magnetic field B on the rear end side and the front end side, and has a weak pincushion magnetic field P or a weak or middle barrel magnetic field B on the intermediate part.
Furthermore, about 1/4 forward from the rear end side and 1 rearward from the front end side
A strong barrel magnetic field B is obtained at about / 4. When a horizontal deflection current in the direction shown in FIG. 5 is passed through the correction coils 27 and 28, the reverse of the above is performed.

Thus, also in this embodiment, the misconvergence can be partially or locally corrected as in the first embodiment.

Further, the feature of the fourth embodiment shown in FIG. 10 is that the winding parts 37A (38A) and 37B (38B) of the correction coils 37 and 38 are wound so that a part thereof is formed into a "C" shape. Each of the winding parts 37
In the middle part of A (38A) and 37B (38B), the coils are wound while being inclined so as to be bent in a "V" shape to the peripheral side, and the winding parts 37A (38A), 37B of the correction coils 37, 38 are wound. (38
B) is formed in a rhombic shape as a whole so as to have a close portion and a spaced portion.

Even with such a configuration, misconvergence can be corrected as in each embodiment.

Although each correction coil is described as using a copper wire in the embodiments, a covered wire (lead wire) insulated by vinyl or the like may be used, and a flexible printed board printed on a flexible resin plate may be used. The substrate may be attached, or the vertical deflection coils 4 and 5 or the auxiliary bobbin fitted to the core 1 may be used.

Further, by causing a horizontal deflection current to flow in the correction coil in the direction as shown in FIG. 5, the coil portion located outside the core also serves as a cancel coil for removing so-called unnecessary radiation that causes the horizontal deflection magnetic field to leak to the outside. Can be operated.

Further, although the toroidal type deflection coil is exemplified as the vertical deflection coils 4 and 5 in the embodiment, a saddle type vertical deflection coil may be used. In this case, the saddle type deflection coil is arranged inside the core 1. Therefore, the correction coil may be wound directly on the core 1.

[Effect of device]

The deflection yoke device according to the present invention is as described above in detail, and the core has a portion where the winding portions on the left and right sides in the winding direction of the horizontal deflection coil and the winding portion of the vertical deflection coil are close to each other. Since the correction coil is wound so as to form a part or the whole of a V-shape, and the correction coil is connected in series with the horizontal deflection coil, the winding position of the correction coil with respect to the horizontal deflection coil, The characteristics of the horizontal deflection magnetic field can be partially or locally changed to the barrel magnetic field or the pincushion magnetic field according to the direction of the horizontal deflection current flowing through the correction coil with respect to the horizontal deflection coil. As a result, the screen characteristics can be reliably corrected by appropriately setting and adjusting the tilt direction and the horizontal deflection current direction when the correction coil is partially or wholly wound in a V shape. it can. Moreover, since the correction coil uses only a toroidally wound winding, automation and standardization are possible,
It can be an inexpensive misconvergence correction device.

[Brief description of drawings]

1 to 7 relate to a first embodiment of the present invention, FIG. 1 is an external view of a deflection yoke device according to the present embodiment, and FIG. 2 is a cross section taken along the line II--II in FIG. FIG. 3 is a cross sectional view showing a state in which the directions of the horizontal deflection currents flowing through the inner coil portions of the horizontal deflection coil and the correction coil are the same, and FIG. 4 shows the horizontal deflection current state shown in FIG. FIG. 6 is an explanatory view showing a characteristic change of the horizontal deflection magnetic field due to movement of the correction coil, and FIG. 5 is a cross-sectional explanatory view showing a state in which the directions of the horizontal deflection currents flowing through the horizontal deflection coil and the coil inside the correction coil are reversed, FIG. 7 is an explanatory view showing a characteristic change of the horizontal deflection magnetic field due to the movement of the correction coil in the state of the horizontal deflection current shown in FIG. 5,
Fig. 7 is a circuit diagram showing the connection of the horizontal deflection coil and the correction coil. Fig. 7 (a) is a circuit diagram when the same direction connection is made.
FIG. 7 (b) is a circuit diagram in the case of reverse connection, and FIGS. 8 to 10 are external views similar to FIG. 1 showing second to fourth embodiments of the present invention, respectively. 1 ... Core, 2, 3 ... Horizontal deflection coil, 4,5 ... Vertical deflection coil, 6 ... Bobbin, 7,17,27,37 ... Upper correction coil, 8,18,2
8,38… Lower correction coil

Claims (1)

[Scope of utility model registration request] 1. A core, a pair of saddle-shaped horizontal deflection coils provided along the longitudinal direction of the core, and a pair of toroidal or saddle-shaped vertical deflection coils provided along the longitudinal direction of the core. In the deflection yoke device, the core has a part in which the left and right winding parts of the horizontal deflection coil and the vertical deflection coil are close to each other in the winding direction and a part in which the winding part is separated from the core. A deflection yoke device characterized in that a correction coil wound so as to form an overall V shape is provided, and the correction coil is connected in series with the horizontal deflection coil.