JPH0121477Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection yoke device most suitable for mounting on an in-line color picture tube.

Generally, in a deflection yoke device mounted on a color picture tube, the magnetic field generated by the deflection coil has a barrel-shaped magnetic field distribution at its front and rear ends, that is, the screen side and the neck side. When the magnetic field in front of the vertical deflection coil (on the screen side) tends to be barrel-shaped, side pink tension distortion occurs on the screen.

To correct this side pink tension distortion,
Conventionally, improvements were made by installing a correction circuit and changing the deflection current, but recently a toroidal vertical deflection coil is divided into two parts and wound around the core, and the winding distribution of the deflection coil is adjusted to the front and rear ends of the core. A side pinless type deflection yoke device has been developed that corrects side pink tension distortion by changing the side pin tension.

However, with the above-mentioned side pinless type deflection yoke device, the toroidal coil wound around the core must be divided and the winding distribution changed at the front and rear ends of the core, which complicates the winding work. It has the disadvantage of being inefficient.

Therefore, by attaching a magnetic field correction means having a magnetic field receiving part and a magnetic field forming part to the front part (screen side) of the deflection yoke device, the deflection yoke can be used without making the winding distribution of the vertical deflection coil special. A so-called arm-type deflection yoke device, which corrects side pink coupling distortion by making the magnetic field distribution uniform at the front of the device, has recently been developed and is being put into practical use.

1 to 4 show a conventional arm-type deflection yoke device provided by the present applicant. In the figure,
1 shows the deflection yoke device as a whole, and 2 is a coil bobbin in which a pair of horizontal deflection coils (not shown) are arranged inside, which are wound in a saddle shape around enlarged parts 2a and 2b formed at the front and rear ends of the coil bobbin. The flange portion of the horizontal deflection coil is housed therein. A core 3 is arranged on the outer surface of the coil bobbin 2 and held in a predetermined position by a core presser 2c provided on the outer periphery of the bobbin 2, and a vertical deflection coil 4 is toroidally wound on the outer surface of the core 3. . A pair of magnetic field correction means 5 made of a magnetic material are attached to the front side of the deflection yoke device 1, that is, near the head side of the core 3 and the vertical deflection coil 4, symmetrically with respect to the vertical deflection axis Y-Y'.
The magnetic field correction means 5 is made of a material with high magnetic permeability and good hysteresis characteristics, such as a silicon steel plate, and as shown in detail in FIG. It has a forming part 5b. The magnetic field receiving portion 5a of the magnetic field correction means 5 has the function of receiving and inducing the leakage magnetic field from the vertical deflection coil 4 and the core 3. For this reason, the magnetic field receiving portion 5a of the magnetic field correction means 5 has the function of receiving and inducing the leakage magnetic field from the vertical deflection coil 4 and the core 3. Moreover, it is arranged as a magnetic plate that curves and extends in the circumferential direction of the core 3. Further, the foot-shaped magnetic field forming portion 5b functions to form a correction magnetic field at a predetermined position by the magnetic field accepted and induced by the magnetic field receiving portion 5a, and is directed in the core circumferential direction of the magnetic field receiving portion 5a. They are provided as magnetic pieces projecting forward of the deflection yoke device from both ends, and the deflection yoke device as a whole is formed in pairs at symmetrical positions with respect to the horizontal deflection axis X-X'. As described above, the magnetic field correcting means 5 are arranged in pairs facing each other, and a correction magnetic field synchronized with the vertical deflection magnetic field is formed between the opposing magnetic field forming portions 5b. Therefore, the deflection magnetic field is substantially strengthened in the portion where the correction magnetic field is formed, making it possible to control the magnetic field distribution. In order to function, the magnetic field correction means 5 needs to accurately regulate its mounting position.

Therefore, in the above deflection yoke device, the magnetic field receiving portion 5a of the magnetic field correcting means 5 is
A mounting tongue piece 5c is formed through a notch S in a direction substantially perpendicular to a, and a portion corresponding to the tongue piece 5c of the coil bobbin 2 (front end enlarged portion 2a
A fitting accommodation portion 2 that fits and accommodates the tongue piece 5c on the side surface of the
After the tongue piece 5c is fitted and accommodated in the fitting accommodation portion 2e and accurately attached to a predetermined position, it is fixed using an adhesive. As shown in detail in FIG. 4, the fitting accommodation portion 2e has clamping portions 20e, 20e that clamp at least both sides of the tongue piece 5c. Further, the magnetic field correcting means 5 is usually made of an elastic material, and claws 5d, 5d are formed at the ends of the magnetic field forming part 5b of the magnetic field correcting means 5, so that when it is attached to the bobbin 2, The guide portions 2f, 2f formed on the bobbin 2 are fitted and locked to hold the magnetic field correction means 5 in a predetermined shape. Furthermore, position regulating plates 2g, 2g are also formed on the side surfaces of the front end enlarged portion 2a of the bobbin 2, and are configured to engage with the end face of the magnetic field correction means 5 to regulate and maintain its position.

Conventional deflection yoke device 1 configured as described above
is attached to the neck of the picture tube (not shown),
After being adjusted to the optimum position, the coil bobbin 2 is fixed by tightening the tightening portion 2d of the coil bobbin 2 with a tightening means (not shown) such as a tightening screw.

However, in the deflection yoke device having such a configuration, the tongue piece 5c formed on the magnetic field correction means 5 is fitted into the fitting housing part 2e formed on the coil bobbin 2, and after being accurately attached to a predetermined position, adhesive is applied. Since the magnetic field correcting means 5 is fixed by using the magnetic field correction means 5, the structure is complicated and the workability when attaching and fixing the magnetic field correction means 5 is poor. In addition, the fixation of the magnetic field correction means 5 was unstable, and there was a risk that the magnetic field correction means 5 would be displaced.

The present invention was devised to eliminate the drawbacks of the conventional devices described above, and provides a deflection yoke device that has a simple structure and can reliably fix the magnetic field correction means to the coil bobbin.

An embodiment of the deflection yoke device of the present invention will be described in detail below with reference to the drawings. Here, parts that are the same as those in the prior art are given the same numbers and their explanations will be omitted. FIG. 5 shows a rear view of the deflection yoke device of the present invention.
At the position corresponding to c (side surface of the front end enlarged part 2a),
A fitting portion 6 is formed that fits and accommodates the tongue piece 5c and fixes it therein. The fitting part 6 is the enlarged front end part 2 of the coil bobbin 2.
It has a space K between it and the side a, and as shown in detail in FIGS. 6 and 7, it is composed of a pair of forked fixing parts 6a, 6a facing each other at a predetermined distance.
The tip of each forked fixing part 6a is divided into two parts, the inner piece 60a has spring properties in the circumferential direction (in the direction of arrow A in the figure), and a protrusion protrudes on the inside of the inner piece 60a, that is, on the side opposite to the divided part. It has a locking portion 61a shaped like this.

In the deflection yoke device having such a configuration, the tongue piece 5c of the magnetic field correction means 5 is inserted into the space K of the fitting part 6 provided on the coil bobbin 2, and both sides of the tongue piece 5c are inserted into the two prongs of the fitting part 6. Fitted and fixed to the shaped fixing part 6a,
At the same time, the claws 5d, 5d provided on the magnetic field correcting means 5 are fitted and locked into the guide parts 2f, 2f formed on the coil bobbin 2, and the position regulating plate 2 of the coil bobbin 2 is
g, 2g with the end face of the magnetic field correction means 5,
The magnetic field correction means 5 is attached and fixed at a predetermined position on the coil bobbin 2. At this time, as shown in FIG. 8, the forked fixing part 6a is fitted into the notch S of the magnetic field receiving part 5a of the magnetic field correcting means 5, and the inner edge S1 of the notch S becomes bifurcated. Inner piece 6 of fixed part 6a
0a in the direction of the divided part, and the inner edge S1 engages with the locking part 61a formed inside the inner piece 60a, so that the magnetic field correction means 5 locks the forked fixing part 6 of the fitting part 6.
The position is regulated by a and can be firmly attached and fixed.

In the deflection yoke device of the present invention, each of the magnetic field forming portions 5b of the magnetic field correction means 5 is divided into several pieces as shown in FIG.
1 may be connected to each other, and when using the magnetic field correction means 5 having such a structure, the magnetic field forming section 5b
Since the correction magnetic field generated by The shape of the forming portion 5b also has the advantage that there is no risk of deformation due to the reinforcing piece 5b1, a predetermined shape can be maintained, and a stable correction magnetic field can always be obtained.

As described above, according to the deflection yoke device of the present invention, a pair of claws are formed at the end of the magnetic field correction means, a guide part is provided at a position corresponding to the claws of the coil bobbin, and the claws are connected to the guide part. At the same time as locking, a tongue piece is formed on the magnetic field receiving part of the magnetic field correction means,
At a position corresponding to the tongue piece of the coil bobbin, a fitting part consisting of a pair of forked fixing parts whose tip is divided into two, the inner piece has a spring property, and a locking part inside the inner piece is formed, and the tongue Both sides of the piece are fitted and fixed to the forked fixing part, a part of the magnetic field receiving part is engaged with the locking part of the inner piece of the forked fixing part, and the magnetic field correction means is attached and fixed to the coil bobbin. The structure is extremely simplified, and work efficiency during installation and fixing is significantly improved. In addition, a part of the magnetic field receiving part of the magnetic field correcting means is engaged with the locking part of the inner piece of the forked fixing part, so that the magnetic field correcting means is completely and firmly fixed without shifting or falling off. It has the effect of Therefore, the side pink friction distortion is corrected by the magnetic field correction means. It has great practical value when applied to a so-called arm-type deflection yoke device.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a conventional deflection yoke device, Fig. 2 is a rear view of Fig. 1, and Fig. 3 is a side view of an example of a conventional deflection yoke device.
, a perspective view of the magnetic field correction means used in the deflection yoke device shown in FIG. A rear view of an embodiment of the deflection yoke device of the present invention, FIG. 6 is an enlarged perspective view of the main part of the coil bobbin, FIG. 7 is a plan view of FIG. 6,
FIG. 8 is an enlarged schematic perspective view showing a state in which the magnetic field correction means is attached to the coil bobbin of FIG. 6, and FIG. 9 is a perspective view of another embodiment of the magnetic field correction means. 1... Deflection yoke device, 2... Coil bobbin,
3... Core, 4... Vertical deflection coil, 5... Magnetic field correction means, 5C... Tongue piece of magnetic field correction means, 6...
Coil bobbin fitting part, 6a... bifurcated fixing part,
60a... Inner piece of the forked fixing part, 61a... Locking part of the inner piece of the forked fixing part.

Claims (1)

[Scope of utility model registration request] It includes a saddle-shaped horizontal deflection coil, a coil bobbin in which the horizontal deflection coil is disposed, a core disposed on the outer surface of the coil bobbin, and a vertical deflection coil wound around the core, the core and the vertical deflection coil being wound around the core. A magnetic field receiving part made of a magnetic material arranged near the head side of the coil and extending in a curved manner in the circumferential direction of the core; and a magnetic field receiving part formed so as to protrude forward from the longitudinal direction of the both end sides of the coil bobbin. A deflection yoke device configured of a magnetic field correction means having a magnetic field forming section, wherein a pair of claws are formed at a longitudinal end of the magnetic field correction means, and a guide section is provided at a position corresponding to the claws of the coil bobbin. established,
The claw portion is locked to the guide portion, and a tongue piece is formed on the magnetic field receiving portion of the magnetic field correction means, and the tip of the coil bobbin is divided into two at a position corresponding to the tongue piece, and the inner piece has a spring property. A deflection yoke characterized in that a fitting part is formed with a pair of forked fixing parts having a locking part on the inside of the inner piece, and the tongue piece is locked in the fitting part. Device.