JPH0785819A - Deflection yoke - Google Patents

Abstract

PURPOSE:To simplify the winding process of a screen rotation preventing coil and to freely choose coils of various types as required with regard to a deflection yoke to be adopted for a computer display device, etc. CONSTITUTION:An arm 16 is extended from the display screen side and the front end part 2 of a deflection yoke 1 to the periphery. A screen rotation preventing coil holding mechanism 17 and a displacement preventing mechanism 21 are formed on the arm 16.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1 to 5) Action (FIGS. 1 to 5) Example (1) Configuration of Example (FIG. 1 to FIG. 1) (FIG. 6) (2) Effect of the embodiment (3) Other embodiment Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke, and can be applied to, for example, a computer display device.

[0003]

2. Description of the Related Art Conventionally, in a monitor device such as a computer display device, a cathode ray tube can be driven to form a high quality raster image.

That is, in this type of monitor, a deflection yoke is arranged in the neck of the cathode ray tube, and a deflection magnetic field is formed by the deflection yoke so as to traverse the tube axis of the cathode ray tube vertically and horizontally. As a result, this type of monitor device is configured to electromagnetically deflect the electron beam of the cathode ray tube with this deflection magnetic field,
As a result, the electron beam is raster-scanned to form a display image.

In this cathode ray tube, when a magnetic field is applied in the tube axis direction of the cathode ray tube in addition to the magnetic field that traverses the tube axis of the cathode ray tube vertically and horizontally, the trajectory of the electron beam changes so as to draw a spiral trajectory. Therefore, in this type of cathode ray tube,
When the intensity of the magnetic field in the tube axis direction of the cathode ray tube changes, the entire display image is tilted and displayed.

On the other hand, geomagnetism is decomposed into a vertical component and a horizontal component, and the monitor device changes the magnetic field strength in the tube axis direction depending on the installation direction due to the horizontal component of the geomagnetism. As a result, this type of monitor device is characterized in that the entire display image is displayed in a tilted manner depending on the installation direction.

Therefore, in this type of monitor device, an image rotation preventing coil is directly attached to the cathode ray tube and is wound around a deflection yoke to form an image rotation preventing coil. The cancel magnetic field is formed so as to cancel the geomagnetic component, and thereby the tilt of the displayed image can be prevented.

[0008]

By the way, when the image rotation preventing coil is directly attached to the cathode ray tube as described above, it is necessary to sufficiently insulate the image rotation preventing coil, and there is a disadvantage that the structure becomes complicated accordingly. The characteristics such as beam landing may change.

On the other hand, when the image-rotation preventing coil is formed by winding directly on the deflection yoke, it has a characteristic that it can be formed by relatively simple insulation. However, for example, the winding distribution of the horizontal deflection coil is set to a predetermined value. In a complicated deflection yoke to be set (that is, with a section-wound deflection yoke),
There is a problem that the winding process of the image rotation prevention coil becomes complicated.
Further, in this type of deflection yoke, by holding the upper and lower pin distortion correction magnets that correct the upper and lower pin distortions, and the substrate of the correction circuit that corrects the deflection magnetic field, etc. In the case of forming, the shape of the deflection yoke becomes complicated and the winding process becomes complicated.

In addition, the intensity of the tube axis direction component of the geomagnetism which is canceled by the image rotation prevention coil varies depending not only on the installation direction of the monitor device but also on the latitude, so that it depends on the destination of the monitor device. It is also necessary to change the number of turns of the cancel coil. Therefore, when forming the image rotation prevention coil by directly winding on the deflection yoke in this way, it is necessary to wind different image rotation prevention coils of different specifications on the common deflection yoke, and the deflection yoke's It is inevitable that product management will become complicated.

Further, it may be desired to attach the image rotation preventing coil to the deflection yoke where the image rotation preventing coil cannot be wound. In this case, the deflection yoke is designed so that the image rotation preventing coil can be wound again. It needs to be fixed and re-produced.

The present invention has been made in consideration of the above points, and an object of the present invention is to propose a deflection yoke which can solve these problems at once.

[0013]

In order to solve such a problem, in the present invention, the horizontal deflection coil and the vertical deflection coil are held on the coil bobbins 2 and 4, and the deflection magnetic field of the cathode ray tube is generated by the horizontal deflection coil and the vertical deflection coil. In the deflection yoke 1 to be formed, the coil bobbins 2 and 4 are provided with arms 16 that extend from the front end face of the cathode ray tube toward the display screen toward the periphery.
An image rotation prevention coil holding mechanism 17 formed on the arm 16 for holding the image rotation prevention coil 3;
The image rotation prevention coil 3 has a position deviation prevention mechanism 21 for preventing the image rotation prevention coil 3 from being displaced, and the image rotation prevention coil holding mechanism 17 holds the image rotation prevention coil 3 separately wound.

Further, in the second invention, the coil bobbins 2 and 4 include a bobbin main body 4 which holds a horizontal deflection coil and a vertical deflection coil, and a front cover 2 which covers the display screen side.
The arm 16 is formed on the front cover 2, and the image rotation prevention coil holding mechanism 17 is formed by the pair of claws 1 formed on the arm 16.
7, the image rotation prevention coil 3 is provided between the pair of claws 17.
And holds the image rotation prevention coil 3, and the position deviation prevention mechanism 21 is arranged close to the pair of claws 17, and when the image rotation prevention coil 3 is inserted between the pair of claws 17, image rotation is prevented. It is formed by ribs 21 that deform the prevention coil 3 to prevent displacement.

Further, in the third invention, the front cover 2
Has a rib 22 which is separated from the arm 16 and protrudes toward the image rotation prevention coil 3 side, and the rib 22 prevents deformation of the image rotation prevention coil 3.

[0016]

The arm 16 extending toward the periphery from the front end portion of the cathode ray tube on the display screen is formed on the coil bobbins 2 and 4, and the arm 16 is provided with an image rotation prevention coil holding mechanism 17 for holding the image rotation prevention coil 3. By forming the position shift prevention mechanism 21 for preventing the position shift of the image rotation prevention coil 3, the image rotation prevention coil 3 wound separately can be held as necessary.

At this time, the arm 16 is formed on the front cover 2, the image rotation prevention coil holding mechanism 17 is formed by the pair of claws 17 formed on the arm 16, and the image rotation prevention coil 3 is formed between the pair of claws 17. If the position deviation prevention mechanism 21 is formed by the ribs 21 that prevent the position deviation by deforming the image rotation prevention coil 3 when inserting the image rotation prevention coil 3, the image rotation prevention coil 3 can be held with a simple configuration.

Further, ribs 22 are formed apart from the arm 16 and project toward the image rotation prevention coil 3, and the ribs 22 prevent the image rotation prevention coil 3 from being deformed. Can be mounted to effectively avoid deformation.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Configuration of the Embodiment In FIGS. 1 and 2, reference numeral 1 denotes a deflection yoke as a whole, which holds an image-rotation preventing coil 3 wound separately using a holding mechanism formed on the front cover 2. To do.

That is, the deflection yoke 1 holds a pair of horizontal deflection coils inside a separator 4 forming a coil bobbin after winding a horizontal deflection coil in a saddle shape using a predetermined die. Further, in the deflection yoke 1, after winding a vertical deflection coil around the core 5, the core 5 is arranged outside the separator 4 by the clamper 6, and then the core 5 is formed by the thermosetting resin 7.
To position.

As a result, the deflection yoke 1 holds the horizontal deflection coil and the vertical deflection coil on the coil bobbin 4, and subsequently holds the front cover 2 and the rear cover 8 on the front end surface and the rear end surface of the coil bobbin 4. The rear cover 8 includes a terminal plate 10 that holds the lead wires 9 of the deflection yoke 1, a correction magnet 11 that corrects the convergence, and an adjustment magnet 1 that adjusts the utility and the like.
2. The band 13 for fixing the deflection yoke 1 to the neck of the cathode ray tube is held.

On the other hand, as shown in FIGS. 3 and 4,
The front cover 2 is formed by molding a predetermined resin, and forms a wall surface around a ring-shaped plate member. As a result, the front cover 2 covers the front end surface of the deflection yoke 1 so that the deflection coil is not exposed.

Further, the front cover 2 has a magnet holding portion 14 formed so as to face each other.
The upper and lower pin distortion correction magnets 15 are held at 4 to correct the pin distortion. Furthermore, the front cover 2 is
An arm 16 is formed so as to extend from the center to the periphery, and an image rotation prevention coil fixing claw 17 is formed at the tip of this arm 16.

As a result, the deflection yoke 1 can hold the image-rotation preventing coil 3 separately formed by the image-rotation preventing coil fixing claw 17. That is, as shown in FIG. 6, the image rotation prevention coil 3 is wound into an elliptical shape a predetermined number of times using a predetermined winding die (in this case, has a circular shape), and then a lead to which the connector 19 is connected is connected. Line 20
Are connected. Further, the image-rotation preventing coil 3 is removed from the winding form after that, and is formed by winding tape around the circumference without leakage, whereby the cross-sectional shape is formed into a circular shape.

On the other hand, the image rotation prevention coil fixing claw 17
Are formed so as to face the arm 16 toward the electron gun side of the cathode ray tube, and each of the tips is formed to be bent inward. Thereby, the deflection yoke 1 can hold the image rotation prevention coil 3 by sandwiching the image rotation prevention coil 3 between the image rotation prevention coil fixing claws 17.

As a result, the deflection yoke 1 is simply assembled by winding it separately with the winding machine to form the image rotation prevention coil 3 and then inserting it between the image rotation prevention coil fixing claws 17 as needed. The desired image rotation prevention coil 3 can be held by the work, and thus the winding work of the image rotation prevention coil 3 can be simplified. Further, it can be freely combined with the image rotation prevention coil 3 wound by a desired number of windings according to the size of the geomagnetism of the destination, and can be used as the deflection yoke 1 alone if necessary. As a result, the usability of the deflection yoke 1 can be improved.

Further, the arm 16 has ribs 21 projecting toward both sides of the image rotation preventing coil fixing claw 17 and toward the image rotation preventing coil fixing claw 17 in the direction in which the image rotation preventing coil 3 extends.
When the image rotation prevention coil 3 is sandwiched between the image rotation prevention coil fixing claws 17, the image rotation prevention coil 3 having a circular cross section is deformed into an elliptical shape and held.
As a result, the deflection yoke 1 prevents the image rotation prevention coil 3 from being displaced when the image rotation prevention coil 3 is held by the image rotation prevention coil fixing claws 17 formed on the four arms 16.

That is, if the image rotation prevention coil 3 held by the deflection yoke 1 is displaced with respect to the deflection yoke 1 as described above, the lead wire 20 or the like may be broken, and the image rotation prevention coil 3 itself may be disconnected. There is a possibility that the image may be deformed and the predetermined image rotation prevention effect may not be exhibited. As a result, the deflection yoke 1 comes close to the image rotation prevention coil fixing claw 17 and the rib 2
The image rotation prevention coil 3 can be prevented from being displaced and the reliability of the deflection yoke 1 can be improved with a simple configuration in which only 1 is formed.

Further, in this embodiment, the front cover 2
Is formed by projecting four ribs 22 away from the arm 16 in a direction in which the image rotation prevention coil 3 is held, and when the elliptical image rotation prevention coil 3 is held, the ribs 2 are formed.
The inside of 2 is held so that the image rotation prevention coil 3 runs.
As a result, the deflection yoke 1 holds the image rotation prevention coil 3 so that the major axis of the image rotation prevention coil 3 having an elliptical shape is in the longitudinal direction of the display screen, and further effectively prevents the image rotation prevention coil 3 from being deformed. It is done like this. That is, there are cathode ray tubes having a deflection yoke of this type with an aspect ratio of 4: 3 and 16: 9. In a horizontally long cathode ray tube with an aspect ratio of 16: 9, the horizontal direction is The image rotation can be effectively avoided by using the image rotation prevention coil 3 deformed into an elliptical shape.

On the other hand, in the cathode ray tube having the aspect ratio of 4: 3, as shown in FIG. 6, it is possible to effectively avoid the inclination of the image by using the image rotation preventing coil 3 wound in a circular shape. it can. Therefore, in the deflection yoke 1 of this type, it is not enough to simply prevent the image rotation prevention coil 3 from being displaced, and it is necessary to prevent the image rotation prevention coil 3 from being deformed.

As a result, the deflection yoke 1 has the rib 22.
Thus, the deformation of the image rotation preventing coil 3 is effectively avoided, and when the image rotation preventing coil wound in a circular shape is attached, the outside of the rib 22 is held so that the image rotation preventing coil runs. be able to. As a result, the deflection yoke 1 can be selectively attached with an elliptical or circular image-rotation preventing coil as required, thereby improving usability.

(2) Effects of the Embodiments According to the above configuration, the arm is extended from the front cover of the deflection yoke to form the image rotation prevention coil fixing claw,
This claw can be used to hold the image rotation prevention coil that is wound separately from the deflection yoke, which makes it possible to assemble the image rotation prevention coil in a simple winding process, and to freely combine it with the deflection yoke as necessary. The anti-rotation coil may be used as a coil to improve the usability of the deflection yoke.

(3) Other Embodiments In the above-mentioned embodiments, the case where the claw 17 is formed toward the electron gun side of the cathode ray tube is described, but the present invention is not limited to this, and the display of the cathode ray tube is described. You may form toward the screen side.

Further, in the above-mentioned embodiment, the case where the arm is formed on the front cover has been described, but the present invention is not limited to this, and when the front cover is integrally formed with the separator made of the coil bobbin, this case is not necessary. The arm may be formed directly on the separator.

Further, in the above-mentioned embodiment, the case where the present invention is applied to a so-called saddle toroidal type deflection yoke has been described, but the present invention is not limited to this, and various deflection yokes such as a saddle saddle type deflection yoke. Can be widely applied to.

[0037]

As described above, according to the present invention, the arm is extended from the front end of the deflection yoke to the display screen side, and the arm is provided with the image rotation prevention coil holding mechanism and the position deviation prevention mechanism. By this, the image rotation prevention coil wound separately from the deflection yoke can be held, and the position deviation can be prevented, so that the image rotation prevention coil can be assembled in a simple winding process, and the image rotation prevention coil can be assembled as necessary. It is possible to obtain a deflection yoke that can be used in any combination with the anti-rotation coil.

[Brief description of drawings]

FIG. 1 is a front view showing a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a side view showing the front cover.

FIG. 4 is a front view thereof.

FIG. 5 is a cross-sectional view showing a method of fixing the image rotation prevention coil.

FIG. 6 is a front view showing an image rotation prevention coil.

[Explanation of symbols]

1 ... Deflection yoke, 2 ... Front cover, 3 ... Image rotation prevention coil, 4 ... Bobbin base, 5 ... Core, 16 ...
Arm, 17 …… Image rotation prevention coil fixing claw, 21, 22 ……
rib.

Claims (3)

[Claims] 1. A deflection yoke in which a horizontal deflection coil and a vertical deflection coil are held in a coil bobbin, and the horizontal deflection coil and the vertical deflection coil form a deflection magnetic field of a cathode ray tube, wherein the coil bobbin is a display screen of the cathode ray tube. Side, the arm extending toward the periphery from the front end portion, the image rotation prevention coil holding mechanism formed on the arm and holding the image rotation prevention coil, and the position deviation of the image rotation prevention coil formed on the arm. A deflection yoke having a position deviation prevention mechanism for preventing the image rotation prevention coil which is separately wound by the image rotation prevention coil holding mechanism. 2. The coil bobbin is formed of a bobbin main body holding the horizontal deflection coil and the vertical deflection coil, and a front cover for covering the display screen side, and the arm is formed on the front cover. The anti-rotation coil holding mechanism is formed of a pair of claws formed on the arm, and the image anti-rotation coil is inserted between the pair of claws to hold the image anti-rotation coil. Is formed by a rib that is disposed close to the pair of claws and that deforms the image rotation prevention coil to prevent positional displacement when the image rotation prevention coil is inserted between the pair of claws. Claim 1 characterized by the above.
The deflection yoke described in. 3. The front cover has a rib which is spaced apart from the arm and protrudes toward the image rotation preventing coil side, and the rib prevents deformation of the image rotation preventing coil. The deflection yoke according to item 2.