JPH0338936Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a deflection distortion correction device applied to a high-resolution deflection yoke used in character display devices and the like.

<Prior Art> The main factor that deteriorates the resolution of a display screen such as a character display device is that the beam spot is distorted into an ellipse when the electron beam passes through a distorted magnetic field. To prevent this phenomenon from occurring, the windings of the horizontal and vertical deflection coils are designed to provide a uniform magnetic field, but when an electron beam is passed through this uniform magnetic field,
Raster deflection distortion appears as pincushion distortion both vertically and horizontally on the cathode ray tube surface. In order to correct each of these pincushion distortions, cylindrical magnets magnetized with two poles in the diametrical direction are installed at the four corners of the front enlarged part of the deflection yoke, which has a relatively small beam diameter and has a relatively small influence on the beam from external magnetic fields. A deflection distortion correction device has been put into practical use, which is rotatably attached to an annular magnetic holder and adjusts the strength and direction of the correction magnetic field according to the deflection distortion to obtain a distortion-free screen. Figures 6 and 7 show a magnetic yoke used in a conventional deflection distortion correction device.
A pole-magnetized cylindrical magnet 9 holds a pair of metal magnets consisting of a magnet holding part 4 and a leg part 5 having an optional elongated hole 12 at one end in a shape that follows the outer circumferential surface of the annular magnet holder 1. A magnet yoke 15 is formed by being held by a tool 2, and a magnet holder 4 is integrally held from the outer periphery of the magnet holder 4 by a magnet cover 8. This magnetic yoke 15 is attached along the outer peripheral surface of the annular magnetic holder 1, and is inserted into the elongated hole 12 provided in the magnetic yoke 15.
Insert the screw 13 into the annular magnet holder 1.
Fixed. Then, by loosening the screw 13, shifting the mounting position of the magnetic yoke 15, and rotating the cylindrical magnet 9, the strength of the correction magnetic field generated via the metal magnet holder 2 is adjusted, and the final distortion is adjusted. I was getting no screen.

<Problems to be Solved by the Invention> In the conventional deflection distortion correction device, when attaching the magnetic yoke 15 to the annular magnetic holder 1, the elongated hole provided in the leg portion 5 of the magnetic yoke 15 is Since the screws 13 are inserted into the screws 12 and fixed by screwing, it takes time to attach and fix them, and the attachment positions tend to vary. Furthermore, when adjusting the deflection distortion, it is necessary to repeatedly adjust the mounting position of the magnetic yoke 15 by tightening and loosening the screw 13, resulting in a drawback that the number of man-hours required for the distortion correction adjustment is large. The present invention was devised in view of the above-mentioned drawbacks, and it is possible to easily attach the magnetic yoke 15 to the annular magnet holder 1, eliminate variations in the mounting position, and reduce the number of man-hours required for adjusting deflection distortion. The present invention aims to provide a correction device.

<Means and actions for solving the problems> Figures 1 to 5 are explanatory diagrams of the deflection distortion correction device of the present invention, and Figure 1 is a front view of the deflection yoke equipped with the device of the present invention. Figure 2 is a front view of the device of the present invention;
Figures 3 and 4 are front and plan views of the same main parts;
FIG. 5 is a sectional view taken along the line AA in FIG. 4. In the figure, reference numeral 1 denotes an annular magnet holder attached to the front enlarged part side of the deflection yoke separator, and the annular magnet holder includes a magnet yoke 1.
5 are arranged symmetrically in four places. The magnetic yoke 15 has a cylindrical magnet 9 magnetized into two poles in the diametrical direction, a pair of metal magnet holders 2 having a holding part 4 for holding the magnet, and extending leg parts 5, and the above-mentioned. It is comprised of a semi-cylindrical cover 8 that tightens and holds the outer periphery of the magnet holding part 4. On the other hand, in the annular magnet holder 1, a groove 3 for slidably attaching the leg part 5 of the magnetic yoke 15 is provided along the circumference of the periphery, and a groove 3 is provided on the outer circumferential side of the groove 3. is 4 in symmetrical position
Cuts 11 are provided at several locations, and a protrusion 14 is provided at the tip of the elastic piece 6 formed by the cuts 11 in the direction of the inner peripheral surface of the annular magnet holder. An elastic tongue piece 16 having a notch 10 is formed in the elastic piece 6, and a locking claw 7 for locking the attached magnetic yoke 15 is provided at the tip of the tongue piece 16.
is provided. With this configuration, the cylindrical magnet 9 held by the magnetic yoke 15 is aligned with the cut 11 of the annular magnet holder 1, and the leg portion 5 of the magnetic yoke 15 is aligned with the groove 3.
By mounting the cylindrical magnet 9 on the magnet yoke 15, the initial position of the cylindrical magnet 9 held by the magnet yoke 15 by the protrusion 14 provided on the elastic piece 6 is accurately determined. Correction of deflection distortion caused by variations in the manufacture of cathode ray tubes and deflection yokes can be adjusted by freely sliding the position of the magnet yoke 15 along the groove 3 of the annular magnet holder 1. In this case, the magnetic yoke 15
At least one of the leg portions 5 pushes up the protrusion 14 in the outer circumferential direction, so that the leg portion 5 is not only pressed by the contact with the protrusion 14 but also is given an appropriate sliding torque by the pressure of the elastic piece 6, so that the magnet Fine adjustment is possible without excessive movement of the yoke 15. Furthermore, if the deflection distortion is finally corrected and a good quality screen is obtained, it may be fixed with paint or the like.

<Effects of the invention> By forming a groove along the circumference on the peripheral edge of the annular magnet holder, and providing four cuts at symmetrical positions on the outer peripheral surface of this groove, the annular magnet holder The magnetic yoke can be easily attached to the magnet, and since the magnetic yoke can freely slide along the groove of the annular magnet holder, assembly work efficiency is greatly improved compared to the conventional installation work using screws. The efficiency of distortion correction work has also improved. Furthermore, due to the protrusions provided at both ends of the cut on the outer circumferential surface side, the mounting position of the cylindrical magnet when the magnet yoke is mounted is fixed, so that variations in deflection distortion are reduced.

[Brief explanation of the drawing]

Figure 1 is a front view of a deflection yoke equipped with the deflection distortion correction device of the present invention, Figure 2 is a front view of the deflection distortion correction device of the present invention, and Figures 3 and 4 are enlarged views of the same essential parts. Front view and plan view, Figure 5 is Figure 4A-
It is an A sectional view. FIG. 6 is a perspective view of a magnetic yoke of a conventional deflection distortion correction device, and FIG. 7 is a front view showing the state in which the magnetic yoke is attached to an annular magnet holder. DESCRIPTION OF SYMBOLS 1... Annular magnet holder, 2... Magnet holder, 3... Groove, 4... Magnet holding part, 5... Leg part, 6... Elastic piece, 7... Locking claw,
8...Cover, 9...Cylindrical magnet, 10...
...Notch, 11...Slit, 12...Elongated hole, 1
3...Screw, 14...Protrusion, 15...Magnetic yoke, 16...Elastic tongue piece.

Claims (1)

[Scope of utility model registration request] A cylindrical magnet 9 magnetized into two poles in the diametrical direction, a pair of metal magnet holders 2 having a holder 4 for holding the magnet and extending leg portions 5, and an outer periphery of the magnet holder 4. It consists of a magnetic yoke 15 consisting of a semi-cylindrical cover 8 for tightening and holding, and an annular magnetic holder 1. A deflection distortion correction device installed on the front enlarged portion side of the separator, the device being
Grooves 3 for slidably mounting the legs of the magnetic holder 1 are formed along the circumference at the peripheral edge of the magnetic holder 1, and grooves 3 are formed symmetrically on the outer peripheral surface side of the grooves 3 of the magnetic holder 1. The elastic piece 6 formed by the cuts 11 is provided with protrusions 14 in the direction of the inner circumferential surface of the annular magnet holder, and the elastic pieces 6 near both sides of the cuts 11 are provided with protrusions 14 at the tips of the elastic pieces 6 formed by the cuts 11. A deflection distortion correction device characterized in that an elastic tongue piece 16 is formed by providing a notch 10 in the elastic tongue piece 16, and a locking claw 7 for locking the attached magnetic yoke 15 is provided at the tip of the tongue piece 16. Device.