JPH07212781A - Color cathode ray tube deflector - Google Patents

Abstract

(57) [Summary] [Object] To provide an inexpensive color cathode ray tube deflector having good convergence characteristics and deflection distortion characteristics by a simple means. A color cathode ray tube deflection device comprising: a color cathode ray tube having an in-line array electron gun; and an in-line type deflection yoke mounted on the color cathode ray tube to deflect an electron beam emitted from the electron gun. A plurality of deflection distortion correcting magnets 1 are arranged at predetermined positions on the outer surface of the funnel portion 4 between the tube surface 8 of No. 3 and the deflection yoke 2 to correct left and right pincushion distortion of the screen of the color cathode ray tube 3. To do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has good deflection distortion characteristics,
In addition, the present invention relates to a color cathode ray tube deflecting device having excellent convergence characteristics.

[0002]

2. Description of the Related Art As a deflection yoke mounted and used in a color cathode ray tube having an in-line array electron gun,
Conventionally, the horizontal and vertical deflection coils are wound so that the horizontal deflection magnetic field distribution is a pincushion type magnetic field distribution and the vertical deflection magnetic field distribution is a barrel type magnetic field distribution, and theoretically a self-convergence configuration is adopted to eliminate misconvergence. A deflection yoke is often used. However, if the electron beam is only deflected by using the self-convergence deflection yoke, pincushion-like distortion is generated in the vertical and horizontal directions of the cathode ray tube screen. It should be noted that, of the above-mentioned distortion, distortion of horizontal lines in the vertical direction of the screen (upper and lower pincushion distortion) can be corrected on the deflection yoke side by adjusting the winding distribution of the horizontal deflection coil. It was corrected by the side.

On the other hand, with respect to the distortion of vertical lines in the left-right direction of the cathode ray tube screen as shown in FIG.
Generally, the correction on the side of the deflection yoke is extremely difficult, and conventionally, a circuit for distortion correction is specially provided to perform the correction. However, due to the structure of the cathode ray tube, there is a difference in the curvature of the screen between the peripheral portion and the middle portion of the cathode ray tube screen,
For example, even if the distortion of the vertical line in the peripheral portion of the screen is completely corrected, a situation in which the correction amount is insufficient in the middle portion of the screen occurs, so that as shown in FIG. There was a problem that the distortion in the middle part of the screen remained. However, since the distortion level in the middle part of the screen is relatively small, the image quality characteristics have not been a serious problem in consumer color television receivers and the like.

[0004]

However, in recent years, computer aided design (CAD, CAM) using a cathode ray tube for an in-line type color display having an extremely flattened tube surface has rapidly become popular. In this computer-aided design, various design drawings and circuit diagrams are frequently displayed on the screen of the color cathode ray tube to proceed with the design, and as the drawing accuracy is required, they remain in the middle part of the screen described above. There was a big problem that the distortion significantly impairs the image quality.

Therefore, in order to correct the distortion remaining in the middle portion of the screen, conventionally, a means for disposing a magnet for correcting the deflection distortion on the front opening side of the deflection yoke has been adopted. However, when the distortion correcting magnet is arranged in the deflection yoke, the convergence characteristic is adversely affected, and the convergence quality is deteriorated.

The reason for this is that when the deflection distortion correcting magnet is arranged on the front opening side of the deflection yoke, the electron beams in the vicinity of the front opening of the deflection yoke are almost not converged. is there. That is, the difference in distance between each electron beam and the magnet is relatively large, and a difference occurs in the magnetic force of the correction magnetic field by the deflection distortion correcting magnet that acts on each electron beam. As a result, as shown in FIG. This is because misconvergence had occurred.

An object of the present invention is to provide a color cathode ray tube deflecting device which solves the above problems by a simple means, has good convergence characteristics and deflection distortion characteristics, and is inexpensive.

[0008]

A color cathode ray tube having an in-line array of electron guns and an in-line type deflection yoke mounted on the color cathode ray tube to deflect an electron beam emitted from the electron gun. In the color cathode ray tube deflecting device, a plurality of deflection distortion correcting magnets are arranged at predetermined positions on the outer surface of the funnel portion between the tube surface of the color cathode ray tube and the deflection yoke, and the left and right pincushion distortion on the screen of the color cathode ray tube is disposed. The magnet may be directly fixed and disposed by an adhesive or an adhesive tape.

Further, the magnet may be arranged by a magnet holder made of a non-magnetic material mounted on a funnel portion, and a magnet mounting arm made of a non-magnetic material provided on the deflection yoke so as to project from the deflection yoke. A magnet may be fixed to the tip side. Furthermore, the magnet mounting arm may be provided with a hinge mechanism.

[0010]

Since the deflection distortion correcting magnet is arranged on the outer surface of the funnel portion between the tube surface of the color cathode ray tube having the electron gun of the in-line arrangement and the deflection yoke, the correction magnetic field of the correcting magnet is changed by the electron beam. It is possible to act on each electron beam at a position where the distance is almost converged and there is almost no difference in the distance between the magnet and each electron beam. As a result, the difference in magnetic force due to the correction magnetic field acting on each electron beam becomes extremely small, and the convergence characteristic is not deteriorated, and the deflection distortion is adjusted.

The deflection distortion correction will be described in detail with reference to FIG. 4 (a view seen from the cathode ray tube surface 8 side). The electron beams (R, G, B) deflected to the peripheral portion which is a diagonal line on the screen are The correction magnetic field generated from the distortion correction magnet 1 receives a force F in the outward direction, and changes the lateral distortion of the peripheral portion of the screen in the pincushion direction. On the other hand, the middle part of the screen at this time is hardly affected by the correction magnetic field by the distortion correcting magnet 1, and the horizontal distortion of the middle part of the screen is hardly changed. Therefore, in this state, the correction amount of the known left / right distortion correction circuit can be increased to completely correct the left / right distortion in the screen peripheral portion and the screen middle portion.

[0012]

The present invention will be described below with reference to the drawings. Figure 1
FIG. 3 is an explanatory view showing the configuration of the essential parts of an embodiment of the deflecting device according to the present invention. In the figure, 1 is a deflection distortion correcting magnet, 2 is a deflection yoke, 3 is a color cathode ray tube having an in-line arrangement of electron guns, 4 is a color cathode ray tube funnel portion, 5 is a correction magnet mounting arm, 6 is a magnet holder, 7 is a double-sided adhesive tape, 8 is a color cathode ray tube surface, and 9 is a hinge mechanism provided on the magnet mounting arm 5. Further, C indicates an electron beam deflected to the peripheral portion of the screen of the color cathode ray tube.

First, in the embodiment shown in FIG. 1, the deflection distortion correcting magnets 1 (four magnets) are provided in a preset funnel portion 4 approximately at an intermediate portion between the tube surface 8 of the color cathode ray tube 3 and the deflection yoke 2. A color cathode ray tube deflecting device is constructed by fixing it to a predetermined portion on the outer surface of the device with a double-sided adhesive tape 7. In this embodiment, the deflection distortion correcting magnet 1 can be easily arranged at a predetermined position of the funnel portion 4.

Next, in the deflecting device of the embodiment shown in FIG. 2, the magnet mounting arm 5 having the hinge mechanism 9 made of a non-magnetic material such as an insulating resin projects toward the tube surface 8 side of the color cathode ray tube 3. In this way, the deflection yoke 2 is screwed and fixed to the coil separator, and the deflection distortion correcting magnet 1 is fixed to the tip of the magnet mounting arm 5 with a double-sided adhesive tape or an adhesive. Needless to say, the hinge mechanism 9 may not be provided on the magnet mounting arm 5, and the coil separator of the deflection yoke 2 and the mounting arm 5 may be integrally formed.

In the deflection apparatus of the embodiment shown in FIG. 3, a magnet holder 6 made of a non-magnetic material such as an insulating resin is fixed to the funnel portion 4 of the color cathode ray tube 3 with a double-sided adhesive tape 6 or the like. The correction magnet 1 is fixed at a predetermined position with a double-sided adhesive tape or an adhesive.

By configuring the color cathode ray tube deflecting device in this way, as shown in FIG. 1B, the center position of the correction magnetic field by the correction magnet 1 acting on each electron beam is the point A of the prior art. To the point B on the cathode ray tube surface 8 side. Then, each electron beam is subjected to the action of the correction magnetic field by the correction magnet 1 at a position where it is in a substantially converged state, as shown in FIG. As a result, there is almost no difference in the distance between the electron beam on the side close to the correction magnet 1 and the electron beam on the side far from the correction magnet 1 and the correction magnet 1. Therefore, the magnetic force of the correction magnetic field by the distortion correction magnet 1 acting on each electron beam is made uniform, the correction magnetic field of the correction magnet 1 does not affect the convergence characteristics, and the deflection distortion characteristics are adjusted. Is performed.

[0017]

According to the present invention, in a color cathode ray tube deflecting device having an in-line array electron gun, deflection distortion can be adjusted by a simple means of using a magnet without degrading convergence characteristics. Therefore, a color cathode ray tube deflecting device which is excellent in image quality and inexpensive can be obtained, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a main configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a main configuration of another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a main part configuration of still another embodiment of the present invention.

FIG. 4 is an explanatory view of a vertical line distortion correction action by a magnet.

5A and 5B show distortion in the horizontal direction of the screen, in which FIG. 5A is an explanatory diagram of vertical line distortion, and FIG. 5B is an explanatory diagram of distortion remaining in the middle portion.

FIG. 6 is an explanatory diagram showing misconvergence.

[Explanation of symbols]

 1 Deflection distortion correction magnet 2 Deflection yoke 3 In-line type color cathode ray tube 4 Funnel section 5 Magnet mounting arm 6 Magnet holder 7 Double-sided adhesive tape 8 Cathode ray tube surface 9 Hinge mechanism C Electron beam

Claims (5)

[Claims] 1. A color cathode ray tube deflection comprising: a color cathode ray tube having an in-line array of electron guns; and an in-line type deflection yoke mounted on the color cathode ray tube to deflect an electron beam emitted from the electron gun. In the device, a plurality of deflection distortion correction magnets are arranged at predetermined positions on the outer surface of the funnel portion between the tube surface of the color cathode ray tube and the deflection yoke so as to correct left and right pincushion distortion on the screen of the color cathode ray tube. A color cathode ray tube deflector characterized by being constructed. 2. The color cathode ray tube deflecting device according to claim 1, wherein the magnet is fixedly disposed by an adhesive or an adhesive tape. 3. The color cathode ray tube deflector according to claim 1, wherein the magnet is arranged by a magnet holder made of a non-magnetic material, which is attached to a funnel portion. 4. The collar according to claim 1, wherein the magnet is arranged so as to be fixed at a tip end side of a magnet mounting arm made of a non-magnetic material provided on the deflection yoke so as to project from the deflection yoke. Cathode ray tube deflector. 5. The color cathode ray tube deflector according to claim 4, wherein the magnet mounting arm is provided with a hinge mechanism.