KR20020009753A - Multi-neck type cathode ray tube - Google Patents

Abstract

PURPOSE: A multi-neck cathode ray tube is provided, which can prevent an electron beam path change due to a terrestrial magnetic field and a screen quality degradation by shielding the electron beam from each electron gun uniformly from the terrestrial magnetic field. CONSTITUTION: The multi-neck cathode ray tube constitutes a vacuum bulb(8) by combining a face panel(2) and a funnel(4) and a number of neck parts(6) in a body, and a fluorescent film screen(10) having a number of R,G,B fluorescent films in the inside of the face panel is formed. And a number of electron guns(12) and deflection yokes(14) are installed at the inner circumference of the neck part and at the outer circumference of a cone part(4a) of the funnel facing with each neck part. If three electron beams are emitted from the electron guns, the emitted electron beams are deflected by a magnetic field generated by the corresponding deflection yoke and form raster at a corresponding region of the fluorescent film screen, and are separated into corresponding R,G,B fluorescent films in the fluorescent film screen through a shadow mask(16) where a number of apertures are formed to express exact colors.

Description

Multi-neck type cathode ray tube

The present invention relates to a multi-neck cathode ray tube having a plurality of electron guns, and more particularly, to minimize the magnetic field interference between the external magnetic field and the plurality of deflection yokes affecting the electron beam path. The present invention relates to a multi-neck cathode ray tube capable of improving quality.

In general, a multi-neck cathode ray tube is a cathode ray tube having a plurality of electron guns and a deflection yoke on a single screen in order to overcome the problems of widening of the depth and wide angle deflection caused by the enlargement of the screen. It is possible to easily implement a large screen with a reduced overall length by dividing into regions, and US Patent Nos. 5,498,921 and 5,584,738 disclose configurations of multi-neck cathode ray tubes.

The known configuration of the multi-neck cathode ray tube is shown in Fig. 7, a fluorescent screen 3 is formed on the inner surface of the face panel 1, a plurality of necks 5 behind the face panel (1) And a funnel 7 connected to each other, and an electron gun 9 for electron beam emission is mounted on the inner circumferential surface of each neck portion 5. And a deflection yoke 11 for generating a deflection magnetic field is mounted on the outer circumferential surface of the funnel 7 facing each electron gun 9, and the shadow mask 13 is fixed so as to face the fluorescent screen 3, and the electron beam path An inner shield 15 that shields from an external geomagnetic field is provided.

As a result, when each electron gun 9 emits a three-stem electron beam corresponding to the R, G, and B fluorescent films, the electron beams are deflected by the magnetic field in which the deflection yoke 11 is generated, and thus on the corresponding small region of the fluorescent film screen 3. A raster is formed and separated into the corresponding fluorescent film by the shadow mask 13, which is a color-selective electrode, to implement a predetermined screen.

As described above, the multi-neck cathode ray tube is provided with a plurality of electron guns 9 to separate and scan a single screen into several small areas, so that a large screen can be easily implemented and effective in reducing the electric field. However, the inner shield 15 shown in FIG. ) Has a weak earth magnetic shielding effect, it is difficult to shield the electron beam from the leakage magnetic field of the plurality of deflection yoke (11).

8 is a perspective view of the inner shield, in which the inner shield 15 forms an opening 15a toward the rear of the cathode ray tube while surrounding the electron beam path, and is integrally formed with the mask frame 17 supporting the shadow mask 13. It is fixed and mounted inside the cathode ray tube, and is made of magnetic material having high permeability to shield the electron beam path from the geomagnetic field.

However, the inner shield 15 having the above-described configuration forms a common opening 15a toward the rear of the cathode ray tube and surrounds all of the electron beams emitted from the plurality of electron guns 9. As a result, the inner shield 15 applied to the multi-neck cathode ray tube increases in the number of the electron guns 9 and the width between the electron guns 9 increases so that its width and the width of the opening 15a are increased.

Therefore, as the width of the inner shield 15 increases, the geomagnetic shielding effect inside the inner shield 15 decreases, so that the geomagnetic shielding effect is remarkable for the portion between each electron gun 9 and the electron gun portion disposed corresponding to the center of the screen. Decreases. In addition, magnetic fields leaking from each deflection yoke 11 may interfere with each other and affect adjacent electron beam paths. As described above, the inner shield 15 having its own width and the width of the opening 15a may be enlarged. (11) The magnetic field interference cannot be blocked.

As a result, the electron beam emitted from each electron gun 9 is affected by the geomagnetic field and the magnetic field leaked from the adjacent deflection yoke at the same time, and as the traveling path changes, the purity characteristics decrease, the raster position changes, and the convergence ( convergence deteriorates all screen characteristics affected by electron beam path movement, such as deterioration of the characteristic of the three-beam electron beam in the beam passing aperture 13a of the shadow mask 13.

In particular, since the multi-neck cathode ray tube divides the entire image into a plurality of small regions, when a quality deterioration occurs in a screen implemented by each small region, the display quality of the entire image is seriously deteriorated.

Therefore, the present invention has been devised to solve the above problems, and an object of the present invention is to uniformly shield the electron beam emitted from each electron gun from the geomagnetic field, thereby preventing the electron beam path change caused by the geomagnetic field and thus degrading the screen quality. To provide a multi-neck cathode ray tube that can be.

Another object of the present invention is to provide a multi-neck cathode ray tube which can minimize the magnetic interference between a plurality of deflection yokes and prevent electron beam path changes due to leakage magnetic fields of adjacent deflection yokes and thereby deteriorate screen quality.

It is still another object of the present invention to provide a multi-neck cathode ray tube that can improve the screen quality of an entire image by improving the quality of a screen implemented by several small regions.

1 is a perspective view of a multi-neck cathode ray tube according to the present invention;

2 is a cross-sectional view taken along the line A-A of FIG.

3 is an exploded perspective view of the inner shield assembly and the mask frame.

4 is a cross-sectional view taken along the line B-B in the engaged state of FIG.

5 is an exploded perspective view of an inner shield and a mask frame according to another embodiment;

6 is a partially enlarged view of FIG. 5;

7 is a cross-sectional view of a multi-neck cathode ray tube according to the prior art.

8 is a perspective view of a combination of the inner shield and the mask frame according to the prior art.

In order to achieve the above object, the present invention,

A face panel forming a fluorescent screen on the inner surface, a funnel connecting the face panel and the plurality of neck portions, a plurality of electron guns mounted on the inner circumferential surface of each neck portion to emit an electron beam toward the fluorescent screen, and each electron gun A plurality of deflection yokes for generating a corresponding deflection magnetic field to separate and scan the electron beam to a specific small region of the fluorescent screen, and an inner shield for shielding the electron beam path from the geomagnetic field,

The inner shield provides a multi-neck cathode ray tube, which forms a plurality of openings facing each electron gun to individually protect the electron beam path emitted from the plurality of electron guns.

As a result, the present invention has a uniform geomagnetic shielding effect for each electron beam path, and can effectively block the leakage magnetic field generated in the adjacent deflection yoke, thereby preventing the electron beam path change caused by the geomagnetic field and the leakage magnetic field and resulting deterioration of image quality. Has the advantage.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a perspective view of a multi-neck cathode ray tube according to the present embodiment, Figure 2 is a cross-sectional view showing the AA line of Figure 1, the multi-neck cathode ray tube is a face panel (2) and funnel (4) and multiple The four neck portions 6 are integrally combined to form a vacuum bulb 8, and a fluorescent screen 10 having a plurality of R, G, and B fluorescent films is formed on the inner surface of the face panel 2. A plurality of electron guns 12 and a deflection yoke 14 are mounted on the inner circumferential surface of the portion 6 and the outer circumferential surface of the cone portion 4a of the funnel 4 facing the neck portion 6, respectively.

Thus, when three electron beams are emitted from the plurality of electron guns 12, the emitted electron beams are deflected by the magnetic field generated by the deflection yoke 14 to form rasters in the corresponding small region of the fluorescent film screen 10. Through the shadow mask 16 in which the beam passing apertures 16a are formed, the R, G, and B fluorescent films in the fluorescent film screen 10 are separated to express accurate colors.

As the multi-neck cathode ray tube individually scans the electron beam into small areas divided by the number of electron guns 12, the entire screen composed of the combination of these images is characterized by image quality characteristics in each small area, and in particular, electron beam deflection. Is greatly influenced by whether or not the raster is formed correctly at the designated position. That is, if the raster is not formed at the designated position, image distortion occurs at the boundary of the images implemented by each small region, which significantly affects the overall screen quality.

Therefore, the present embodiment is provided with a plurality of openings facing each electron gun 12 to block each of the electron beam paths, in order to provide an accurate electron beam path by blocking external factors affecting the electron beam path. An individually enclosing inner shield assembly 20 is provided.

3 is an exploded perspective view of an inner shield assembly and a mask frame provided in this embodiment, and FIG. 4 is a cross-sectional view illustrating the BB line of FIG. 3 in a coupled state, and as shown, the inner shield assembly 20 is individually A plurality of small inner shields 18 corresponding to the electron gun 12 are integrally combined, and each small inner shield 18 has a shadow mask 16 common to the electron gun 12. Top openings 18a and bottom openings 18b are formed, respectively.

The individual small inner shields 18 gradually enlarge their width from the top opening 18a toward the bottom opening 18b to maximize the close proximity to the electron beam path emitted from the electron gun 12, respectively. Will be surrounded by. As such, the electron beam emitted from each electron gun 12 passes through the inner inner shield 18 and then passes through the shadow mask 16 to the fluorescent screen 10.

As described above, the inner shield assembly 20 having the plurality of small inner shields 18 corresponding to the respective electron guns 12 is made of ferromagnetic metal or paramagnetic metal having a high permeability, and when the magnetic field is applied from the outside (that is, When placed under the influence of the earth's magnetic field, it forms a magnetic field in a direction opposite to that of the magnetic field, and has a magnetic shielding effect therein.

At this time, since the inner shield assembly 20 individually surrounds the electron beam paths emitted from each of the electron guns 12, the inner shield assembly 20 has the magnetic field paths of the individual electron beam paths regardless of the position of the electron gun 12. Since shielding can be made uniformly, the electron beam path by a geomagnetic field can be suppressed more effectively. At the same time, the electron beam path change caused by the leakage magnetic field can be minimized by shielding the individual electron beam paths from the leakage magnetic field generated in the adjacent deflection yoke 14.

As such, the inner shield assembly 20 having a plurality of small inner shields 18 to protect the electron beam from the leakage magnetic field of the geomagnetic field and the adjacent deflection yoke 14 is mounted to the inside of the cathode ray tube, so that the mask frame 22 can be mounted. A fixed end 24 having a predetermined width so as to face one end of the inner side, and coupling holes 24a and 22a formed on at least two sides of the fixed end 24 and the mask frame 22 to form an inner shield having a known configuration. The fastening clip 26 may be integrally fixed to the mask frame 22.

On the other hand, the inner shield assembly 20 as another embodiment, it is possible to individually mount the individual small inner shield 18 to the rear of the mask frame 22 facing the electron gun 12, for this purpose, the mask frame 22 A support member 28 for mounting the small inner shield 18 to the opening 22b is provided.

5 is an exploded perspective view of an inner shield-mask frame assembly according to another embodiment of the present invention, and FIG. 6 is a partially enlarged view of FIG. 5, and as shown, the mask frame 22 has an opening 22b for passing an electron beam. Is provided with a plurality of support members 28 which traverse the opening 22b in the horizontal and vertical directions so that?) Can be divided into small regions corresponding to the respective electron guns 12.

In addition, a plurality of small inner shields 18 having a size corresponding to each small region are fixed to the supporting member 28. For this purpose, a fixing corresponding to the supporting member 28 is formed around the individual small inner shield 18. The end 30 is formed, and coupling holes 30a and 28a are formed in at least two sides of the fixed end 30 and the support member 28, respectively, through the inner shield fastening clip 26 of a known configuration. Small inner shield (18) can be fixed to the support member (28).

At this time, the support member 28 is formed with a minimum width so that the electron beam passing through the inside of the small inner shield 18 does not cause a collision while securing an appropriate width that can be combined with the small inner shield 18. It is desirable to prevent shadows caused by blocking from occurring on the screen.

Thus, the present embodiment in which a plurality of small inner shields 18 are separately attached to the mask frame 22 prevents shaking of the entire inner shield by dispersing the applied external force even when an external force such as vibration is applied from the outside. By distributing and supporting the load of the inner shield 18, the inner shield 18 has an advantage of preventing the deflection due to the load and the positional change caused by the load.

In other words, the inner shield is very sensitive to height, shape, opening width, and positional characteristics in addition to material characteristics. Therefore, when the inner shield is changed due to external vibration or its own load, it significantly affects the magnetic shielding characteristics. . Therefore, when the individual small inner shields 18 are separately attached to the mask frame 22 as described above, problems caused by the positional change of the inner shield can be prevented.

As such, the present embodiment provides uniform inner magnetic field shielding effect for each electron beam path by providing an inner shield assembly 20 or a plurality of small inner shields 18 having a plurality of openings corresponding to each electron gun 12. It has the advantage that it can effectively block the leakage magnetic field generated in the adjacent deflection yoke (14).

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, the present invention includes an inner shield having a plurality of openings corresponding to each electron gun, so that the electron beam path can be shielded from the leakage magnetic field generated in the adjacent deflection yoke while providing a uniform magnetic field shielding effect on each electron beam path. . Therefore, by preventing the electron beam path change caused by the geomagnetic field and the leakage magnetic field, the electron beam emitted from each electron gun can be accurately moved to the designated path so that the image quality of each small area and the combination of many images can effectively reduce the screen quality. Can be improved.

Claims (7)

A face panel forming a fluorescent screen on the inner surface, a funnel connecting the face panel and the plurality of neck portions, a plurality of electron guns mounted on the inner circumferential surface of each neck portion to emit an electron beam toward the fluorescent screen, and each electron gun A plurality of deflection yokes for generating a corresponding deflection magnetic field to separate and scan the electron beam to a specific small area of the fluorescent film screen, and an inner shield for shielding the electron beam path from the geomagnetic field; And the inner shield forms a plurality of openings facing each electron gun to individually protect the electron beam paths emitted from the plurality of electron guns. The method of claim 1, The inner shield is a multi-neck cathode ray tube comprising an inner shield assembly in which a plurality of small inner shields corresponding to each electron gun are integrally coupled. The method of claim 2, The inner shield assembly has a fixed end having a predetermined width facing one end of the mask frame, and has a coupling hole in at least two sides of the fixed end and the mask frame to be integrally fixed to the mask frame through an inner shield fastening clip. Multi-neck cathode ray tube. The method of claim 1, The inner shield is a multi-neck cathode ray tube, the plurality of small inner shields corresponding to each electron gun are individually coupled to the rear of the mask frame. The method of claim 4, wherein And the mask frame includes a plurality of support members that traverse the openings through which the electron beam passes in horizontal and vertical directions to fix the plurality of small inner shields. The method of claim 5, Each small inner shield forms a fixed end corresponding to the support member at its periphery, and forms a coupling hole in at least two sides of the fixed end and the support member to fix the small shield to the support member through an inner shield fastening clip. Multi-neck cathode ray tube. The method of claim 5, The support member has a coupling hole for coupling with the small inner shield is formed, the multi-neck cathode ray tube is formed with a minimum width so that the electron beam passing through the small inner shield does not cause a collision.