JPH0714543U - Deflection yoke for monochrome display monitor - Google Patents

Abstract

(57) [Summary] [Objective] With the widening of the deflection of the cathode ray tube display and the flattening of the screen, the pincushion distortion (so-called inner pincushion distortion) remaining near the center of the screen that could not be corrected by the conventional deflection yoke. ) Can be corrected by a simple means, and a deflection yoke for a monochrome display monitor capable of obtaining a high-quality image with high accuracy is provided. [Structure] Deflection yoke 9 mounted on a single electron gun cathode ray tube
In the upper and lower parts of the expanded opening on the funnel side of the cathode ray tube of
A parabolic wave current synchronized with the vertical deflection period generates a magnetic flux that corrects the inner pincushion distortion remaining near the central portion of the screen, and at least a pair of electromagnetic magnets, or an upper and lower bobbin that is a combination of the electromagnetic magnet and a permanent magnet. Distortion correcting means 1 and 2 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a deflection yoke for a black-and-white display monitor, and in particular, a pincushion distortion (a so-called inner pincushion) generated near the central portion on the display screen of the cathode ray tube due to the enlargement of the cathode ray tube, the wide angle deflection and the flattening of the screen. The present invention relates to a deflection yoke for a monochrome display monitor capable of correcting distortion.

[0002]

[Prior art]

 Conventionally, a deflection yoke having a structure as shown in FIG. 4 has been widely used as a deflection yoke for a monochrome display monitor mounted and used in a single electron gun cathode ray tube. In the figure, 10 is a coil separator, and 11 is a horizontal deflection coil mounted on the inner peripheral surface of the coil separator. Numerals 1A, 1B, 3 and 4 are bar magnets composed of permanent magnets as deflection distortion correcting means which are arranged on the upper and lower sides and on the left and right sides of the deflection yoke 9 on the enlarged opening side. These bar-shaped magnets 1A, 1B, 3 and 4 have upper and lower pincushion distortions and left and right pincushion distortions that remain on the screen of the cathode ray tube as shown by the broken line in FIG. 3 in the deflection yoke without the deflection distortion correction means. Generates a correction magnetic flux for correction. The magnets 1A, 1B, 3 and 4 are integrally formed on the coil separator 10 in advance so as to slidably hold the distortion correcting means 1A, 1B, 3 and 4, respectively. It is attached to the deflection yoke via (not shown) or the like. Then, by adjusting the mounting positions of the respective distortion correcting means 1A, 1B, 3, 4, and by changing the length of the rod-shaped magnet to adjust the magnetic flux density of the magnetic flux generated by the distortion correcting means, the upper, lower, left and right bobbins are wound. After the distortion is corrected and the respective pincushion distortions are corrected, the respective distortion correcting means 1A, 1B, 3 and 4 are adhered and fixed to the coil separator 10.

[0003]

[Problems to be solved by the device]

 By the way, recently, the accuracy of the monochrome display monitor device has been improved, and the horizontal deflection frequency has been increased accordingly. In addition, cathode ray tubes have become larger, have a wider angle of deflection, and have a flat screen. Along with that, high-precision correction has been required for vertical and horizontal pincushion distortion.

By the way, when the vertical and horizontal pincushion distortions are corrected by the deflection yoke having only the conventional distortion correction means, the left and right pincushion distortions are corrected by the conventional distortion correction means alone. There was no problem. To correct the upper and lower pincushion distortion, combine the rod magnets or use a trapezoidal magnet to change the magnetic flux density of the magnetic flux generated by the distortion correction means, making the outer peripheral side of the upper and lower parts of the screen linear. It was possible to correct it. However, in this case, there is a problem that a pincushion distortion (so-called inner pincushion distortion) remains in the vicinity of the central portion on the screen, as shown by a chain line in FIG. Moreover, it is extremely difficult to correct this inner pincushion distortion only with a rod-shaped magnet or a trapezoidal magnet, and since adjustment work requires skill, there is a major difficulty in adjustment workability.

An object of the present invention is to provide a deflection yoke for a high-accuracy black-and-white display monitor that solves the above-mentioned problems, can correct inner pincushion distortion by a simple means, and can obtain a high-quality screen.

[0006]

[Means for Solving the Problems]

 A black-and-white display monitor deflection yoke comprising a pair of horizontal deflection coils, a pair of vertical deflection coils, the horizontal deflection coil on the inner peripheral surface, and the vertical deflection coil and a magnetic core on the outer peripheral surface. The upper and lower sides of the deflection yoke enlargement opening, which is the cathode ray tube funnel side when the deflection yoke is attached to a single electron gun cathode ray tube, corrects the upper and lower pincushion distortions by the parabolic wave current synchronized with the vertical deflection period. The deflection yoke is configured by disposing at least a pair of electromagnetic magnets that generate a magnetic flux, or upper and lower pincushion distortion correcting means that is a combination of the electromagnetic magnets and a pair of permanent magnets. Further, it is preferable to use a rod-shaped or trapezoidal magnet for the permanent magnet.

[0007]

[Operation] Since the parabola wave-shaped current synchronized with the vertical deflection period flows through the electromagnetic magnet, the magnetic flux density of the magnetic flux generated from the electromagnetic magnet or the magnetic flux density of the combined magnetic flux generated by the electromagnetic magnet and the magnetic flux generated by the rod magnet is , The lowest when the electron beam is deflected to the upper and lower parts of the screen, and the highest when it is deflected to the center part of the screen. Therefore, assuming that the distortion at the top and bottom of the screen is corrected to a straight line with the lowest magnetic flux density as described above, the inner pincushion distortion becomes a problem to the middle part of each of the upper half or the lower half of the screen. The magnetic flux density when the electron beam is deflected becomes higher than the magnetic flux density when the electron beam is deflected to the outermost periphery above and below the screen, so that the inner pincushion distortion is corrected.

[0008]

【Example】

 The present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing the structure of a deflection yoke according to the present invention. In the figure, 1 and 2 are a pair of upper and lower pincushion distortion correcting means. The distortion correcting means 1 and 2 are constructed by winding magnet wires around the magnetic cores, and from these correcting means 1 and 2, the terminal lead wires 5, 6 of the correcting means 1 and 2 and Terminal leads 7, 8 have been derived. The distortion correction means 1 and 2 are further combined with a rod-shaped magnet or a trapezoidal magnet. Further, each of these distortion correcting means 1, 2, 3, 4 is slidably attached to a distortion correcting means attaching piece (not shown) or the like which is integrally molded in advance with the coil separator 10 and the like. The position and the size of the magnet are adjusted to correct the pincushion distortion, and then fixed to the coil separator 10 with an adhesive. The terminal lead wires 5, 6 and 7, 8 of the distortion correcting means 1 and 2 are connected to a terminal plate (not shown) arranged on the coil separator 10 and provided on the circuit side. As shown in FIG. 2 (b), the parabolic wave current supplied from the parabolic wave current generation circuit and synchronized with the vertical deflection period is supplied to the distortion correction means 1 and 2.

In the black and white display monitor in which the deflection yoke configured as described above is attached to the single electron gun cathode ray tube, the left and right pincushion distortions are corrected by the distortion correction means 3 and 4 composed of rod-shaped magnets as in the conventional case. The magnetic flux density of the correction magnetic flux can be adjusted by adjusting the mounting position or the length of the magnet.

Further, the upper and lower pincushion distortions are corrected by adjusting the mounting positions of the distortion correcting means 1 and 2 supplied with the parabolic wave-shaped current synchronized with the vertical deflection period as shown in FIG. 2B. Distortion correction means 1 and 2 which are configured by combining these distortion correction means 1 and 2 and the magnetic flux generated by the distortion correction means 1 and 2 and a rod magnet or a trapezoidal magnet that forms a composite magnetic flux are generated. It can be performed by changing the magnetic flux density.

When the vertical and horizontal pincushion distortions have been corrected, these distortion correction means 1, 2 and 3, 4 are fixed to the coil separator 10 with an adhesive.

As a result, it is possible to correct the inner pincushion distortion in the vicinity of the central portion of the screen, which could not be corrected only by the conventional distortion correction means using a magnet, and to provide a deflection yoke for a black-and-white display monitor that can obtain high image quality. .

[0013]

[Effect of device]

 According to the present invention, the deflection yoke using only the conventional pincushion distortion correction means is a single-electron gun cathode wire with a wide angle deflection and a flatness, which is used in a black-and-white display monitor device with high accuracy and high frequency. Inner pincushion distortion remaining near the center of the screen is corrected by a simple means, and a deflection yoke for a monochrome display monitor that can obtain a high-quality image can be provided, and its practical effect is great.

[Brief description of drawings]

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

FIG. 2 is a waveform diagram of a vertical deflection current and a parabolic wave current synchronized with a vertical deflection period.

FIG. 3 is an explanatory diagram of vertical and horizontal pincushion distortion.

FIG. 4 is an explanatory diagram showing a configuration of a conventional deflection yoke.

[Explanation of symbols]

 1, 2 Upper and lower pincushion distortion correcting means 1A, 1B, 3, 4 Rod magnets 5, 6, 7, 8 Terminal lead wire 9 Deflection yoke 10 Coil separator

Claims (2)

[Scope of utility model registration request] 1. A black and white display monitor deflection yoke comprising a pair of horizontal deflection coils, a pair of vertical deflection coils, and an inner peripheral surface on which the horizontal deflection coil is mounted, and an outer peripheral surface on which the vertical deflection coil and a magnetic core are mounted. In the upper and lower parts of the deflection yoke enlargement opening side, which is the cathode ray tube funnel side when the deflection yoke is attached to the single electron gun cathode ray tube,
At least a pair of electromagnetic magnets that generate a magnetic flux that corrects the upper and lower pincushion distortion by a parabolic wave current synchronized with the vertical deflection period, or upper and lower pincushion distortion correction means that is a combination of the electromagnetic magnet and a pair of permanent magnets is provided. A deflection yoke for a black and white display monitor. 2. The deflection yoke for a monochrome display monitor according to claim 1, wherein the permanent magnet is a rod-shaped or trapezoidal magnet.