JPH0739164Y2 - 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 picture tube such as a television receiver and a display device, and includes a correction coil device for correcting misconvergence. And a deflection yoke device.

[Conventional technology]

In general, the deflection yoke device is provided with a cylindrical coil bobbin, a horizontal deflection coil which is provided on the coil bobbin and generates a horizontal deflection magnetic field as a pincushion magnetic field by supplying a horizontal deflection current, and a state in which the horizontal deflection coil is insulated from the horizontal deflection coil. And a vertical deflection coil that generates a vertical deflection magnetic field as a barrel magnetic field by supplying a vertical deflection current. The deflection yoke device is mounted on the neck portion of a color picture tube in which three electron guns for outputting red, green, and blue electron beams are arranged inline in the horizontal direction, and a horizontal deflection current is supplied to the horizontal deflection coil. In addition, a vertical deflection current is supplied to the vertical deflection coil, and the horizontal deflection magnetic field and the vertical deflection magnetic field generated from each coil are used to deflect the electron beam of each color from each electron gun. .

However, in the case of such a configuration, at the upper and lower points of the screen, the central green electron beam lacks sensitivity to the red and blue electron beams located on both sides, resulting in red and blue electron beams. On the other hand, there is a problem in that misconvergence that the green electron beam is displaced (this misconvergence is called vertical coma aberration, and correcting this coma aberration is called coma correction) occurs.

Therefore, correction coil devices for correcting the horizontal deflection magnetic field generated by the horizontal deflection coil and the vertical deflection magnetic field generated by the vertical deflection coil are provided above and below the enlarged rear end portion of the coil bobbin, and the deflection sensitivity of the central green electron beam is A deflection yoke device is known in which the above-mentioned misconvergence is corrected by increasing the deflection sensitivity of the red and blue electron beams located on both sides.

A deflection yoke device having a correction coil according to the prior art will be described with reference to FIGS. 7 to 11.

In the figure, reference numeral 1 is a deflection yoke device, and the deflection yoke device 1 has a coil bobbin 2 formed in a bosh shape by an insulating resin material, and the coil bobbin 2 is expanded in a bosh shape as shown in FIG. 2 described later. A peripheral body portion 2A, a front end enlarged portion 2B that expands in a collar shape on the front end side of the peripheral body portion 2A, a rear end enlarged portion 2C that expands in a collar shape on the rear end side of the peripheral body portion 2A, and the rear end enlarged portion. It is composed of a tightening portion 2D provided at the rear end of 2C. here,
A pair of saddle-type horizontal deflection coils (not shown) are provided on the inner peripheral side of the coil bobbin 2, and a pair of toroidal vertical deflection coils 4, 4 wound around the core 3 are provided on the outer peripheral side of the coil bobbin 2. Is provided. The deflection yoke device 1 is attached to the neck portion 5 of the picture tube in which the three electron guns of R, G, B are arranged in-line, and is fixed by tightening the tightening portion 2D with a tightening ring or the like. .

Reference numerals 6 and 6 denote correction coil devices attached to the rear surface side of the rear end enlarged portion 2C of the coil bobbin 2, and each of the correction coil devices 6 is R,
The G and B electron beams are vertically arranged so as to be positioned on both sides in the direction orthogonal to the in-line arrangement. here,
Each of the correction coil devices 6 has a U-shaped core 7 whose legs are arranged to face the neck portion 5 of the color picture tube,
A bobbin 8 provided at the center of the core 7, and the bobbin 8
The correction coil 9 is wound around.

Here, the core 7 of the correction coil device 6 will be described with reference to FIGS. 8 to 11. The core 7 is composed of L-shaped core forming members 10 and 11 made of a magnetic material such as ferrite. That is, the core 7 includes a right core forming member 10 including a leg portion 10A and a bobbin fitting portion 10B forming an arm portion substantially perpendicular to the leg portion 10A, and also the leg portion 11A and the leg portion 1A.
A left side core forming member 11 including a bobbin fitting portion 11B forming an arm portion substantially perpendicular to 1A, and the bobbin fitting portion
10B and 11B are partially overlapped and fitted in the bobbin 8 to form a U-shape.

In the correction coil device 6 thus configured, each correction coil 9 is connected in series with the vertical deflection coils 4 and 4 and a vertical deflection current is supplied to generate a correction magnetic field indicated by reference numeral 12 in FIG. Then, frame correction can be performed.

[Problems to be solved by the device]

Now, regarding the correction coil device 6 configured as described above, the core 7 is formed in a U shape by stacking the L-shaped core forming members 10 and 11, and each of the core members 10 and 11 is formed. Is merely an L-shaped flat plate. Therefore, the tips of the leg portions 10A, 11A of the core forming members 10, 11 have a small surface area which is a magnetic field generation portion only with these cross-sectional areas, and the correction magnetic field 12 given to the picture tube neck portion 5 is small, that is, There is a problem that the sensitivity of coma correction is not very good.

Further, in order to increase the correction magnetic field 12, the correction coil 9
It is possible to increase the number of turns of, but in this case,
The self-impedance of the correction coil 9 itself becomes large. Therefore, the vertical deflection current supplied from the vertical deflection circuit is taken by the correction coil 9, and the original current supplied to the vertical deflection coil 4 decreases, which may cause a problem such as a decrease in the vertical deflection magnetic field. .

The present invention has been made in view of the above problems of the conventional art, and an object of the present invention is to provide a deflection yoke device capable of surely correcting misconvergence.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the feature of the means adopted by the present invention is that the correction coil device comprises a U-shaped core, a leg portion, an arm portion substantially perpendicular to the leg portion, and a leg portion. It is formed by combining four core forming members, each of which is formed of an L-shaped left and right two pieces formed by a bent portion in which the tip of the portion is bent along the neck portion of the picture tube, the left, This is because the left and right magnetic field generating parts are configured by two bent parts by the core forming members for every two right parts.

[Action]

With the above-mentioned configuration, when four U-shaped core-forming members that are formed in an L shape by the leg portion and the arm portion are combined to form a U-shaped core by combining two pieces each on the left side and the right side, the two pieces positioned on the left and right Each of the core forming members constitutes a magnetic field generating part in which two bent parts form respective surface areas, so that the area of the magnetic field generating part at the tip of the core can be increased and the correction magnetic field is increased. be able to.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. It should be noted that the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 21 and 21 are the correction coil devices of the present embodiment (only one is shown), and each of the correction coil devices 21 is positioned on both sides of the R, G, and B electron beams in the orthogonal direction with the in-line arrangement, It is arranged in the vertical position. Here, the correction coil device
21 is a U-shaped core in which the legs are arranged so as to face the neck portion 5 of the color picture tube, as in the prior art 22
And a correction coil device 24 wound around the bobbin 23 and a bobbin 23 provided in the center of the core 22.

Therefore, the core 22 of this embodiment is formed by combining four core forming members 25, 26, 27 and 28 formed of a magnetic material such as ferrite. Here, each of the core forming members 25 to 28 includes leg portions 25A to 28A, bobbin fitting portions 25B to 28B forming arm portions substantially perpendicular to the leg portions 25A to 28A, and leg portions 25.
Formed by bending the tip of A ~ 28A, the leg 25
Bent portions 25C to 28C that are wider than the width of A to 28A and are curved along the tube surface of the neck portion 5 of the picture tube.
And core forming members 25 and 28, 26 and 27, respectively.
Have the same shape.

Here, the two core forming members 25 and 26 located on the right side and the two core forming members 27 and 28 located on the left side are combined to form the left bobbin fitting portions 25B and 26B and the right bobbin fitting portion. 27B, 28B
And U are partially overlapped with each other and fitted into the bobbin 23 to form the U-shaped core 22. At this time, the core forming member
The bent portions 25C and 26C of 25 and 26 become the magnetic field generating portion on the right side facing the neck portion 5 of the picture tube, and the core forming members 27 and 28 are also formed.
The bent portions 27C and 28C are the magnetic field generating portions on the left side.

Although the present embodiment is configured in this way, the operations of the deflection yoke device and the correction coil device 21 itself are the same as those of the prior art.

However, in the past, the magnetic field generation section was only the plate cross-sectional area of the tip of the leg, but in the magnetic field generation section of this embodiment, the bent section 25
The surface area is C to 28C, and the magnetic field generation part on the right side is the bent part 25.
The total surface area is C, 26C, and the left magnetic field generation area is the total surface area of the bent parts 27C, 28C. The magnetic field generation area is extremely wide, the correction magnetic field is increased, and the neck 5 of the picture tube can be secured. A correction magnetic field can be applied to.

As a result, it is possible to improve the correction sensitivity and
Frame correction can be reliably performed, and an image without distortion can be displayed on the picture tube. Further, in this embodiment, since the core forming members 25 to 28 are symmetrical with respect to the left and the right, the working and assembling work at the time of manufacturing the core forming member can be simplified. Furthermore, it is not necessary to increase the number of turns of the correction coil 24 as in the conventional technique, and conversely, the number of turns of the correction coil 24 can be reduced.

In the above embodiment, the bent portions of the core forming members 25 to 28 are
Although 25C to 28C are curved surfaces along the tube surface of the picture tube neck portion 5, each bent portion 25C 'is similar to the modified example according to FIG.
28C 'may be formed in a branch shape along the tube surface of the neck portion 5.

Further, in this embodiment, the core 22 is made up of four core forming members 25, 2
Although 8 are overlapped, they may be formed by butting.

Further, in each of the above-described embodiments, the correction coil device for frame correction is provided in the vertical direction of the coil bobbin. However, in the present invention, the misconvergence generated on the screen is suppressed by the upper and lower end portions on the Y axis of the screen. The correction coil device that corrects the horizontal misconvergence Y _H in FIG. 4 can also be applied to a correction coil device that is provided so as to face left and right on the Y axis.

[Effect of device]

As described above in detail, according to the present invention, the U-shaped core forming the correction coil device is provided with the leg portion, the arm portion substantially perpendicular to the leg portion, and the tip of the leg portion of the picture tube. Left and right 2 formed into an L shape by the bent part that is bent along the neck part
It is formed by combining four core forming members, and the left and right magnetic field generating parts are formed by the two bent portions formed by the left and right core forming members, respectively. ，
The surface area of the right magnetic field generation portion can be the total surface area of the two bent portions, and the correction magnetic field is increased by increasing the surface area of the magnetic field generation portion to surely generate the correction magnetic field.
While improving the correction sensitivity of misconvergence,
The correction can be surely performed.

[Brief description of drawings]

1 to 5 relate to an embodiment of the present invention. FIG. 1 is an enlarged view of a main part of a rear side of a coil bobbin, FIG. 2 is a bottom view of FIG. 1, and FIG. 3 shows an assembled state of a core. Front view, FIG. 4 is a bottom view of FIG. 3, FIG. 5 is a perspective view of a core forming member, FIG. 6 is a front view showing a core according to a modification, and FIGS.
FIG. 11 shows a conventional technique, FIG. 7 is an external view of a rear surface side of a deflection yoke device according to the conventional technique, FIG. 8 is an enlarged view of a main part of FIG. 7, and FIG. 9 is a front view showing an assembled state of a core. 10 is a bottom view of FIG. 9, and FIG. 11 is a perspective view of the core forming member. 1 ... Deflection yoke, 2 ... Coil bobbin, 2B ... Front end enlarged part, 2C ... Rear end enlarged part, 4 ... Vertical deflection coil, 21 ...
... correction coil device, 22 ... core, 23 ... bobbin, 24 ...
Correction coil device, 25, 26, 27, 28 ... Core forming member, 25A, 2
6A, 27A, 28A …… Legs, 25B, 26B, 27B, 28B …… Bobbin fitting part (arm), 25C, 26C, 27C, 28C, 27C ′, 28C ′ …… Bending part.

Claims (1)

[Scope of utility model registration request] 1. A coil bobbin having a front end enlarged portion and a rear end enlarged portion, which is mounted on a neck portion of a picture tube, and a horizontal deflection coil and a vertical deflection coil provided on the coil bobbin in a state of being insulated by the coil bobbin. A coil and a correction coil device provided on the side of the enlarged rear end of the coil bobbin and having a coil wound around a U-shaped core. The correction magnetic field generated by the correction coil device corrects misconvergence. In the deflection yoke device described above, the U-shaped core of the correction coil device includes a leg portion, an arm portion substantially perpendicular to the leg portion, and a tip of the leg portion bent along the neck portion of the picture tube. It is formed by combining four core forming members, each of which is a left and right two sheets formed in an L shape by the bent portion, and two pieces are formed by the core forming members of the left and right two sheets. Bent part A deflection yoke device characterized in that the left and right magnetic field generators are configured with the above.