KR20020036585A - Beam index type cathode ray tube - Google Patents

Abstract

PURPOSE: A cathode ray tube using a beam index is provided to enhance correction efficiency of an electron beam and reduce a current value required to correct the size of the electron beam. CONSTITUTION: A cathode ray tube comprises a vacuum tube(20), a screen(22), an electron gun(24), a deflector(26), a focusing part(28), a correcting element, and an enhancement element. The vacuum tube(20) is formed by a panel(20a), a funnel(20b) and a neck(20c). The screen(22) is formed on the inner surface of the panel(20a) with fluorescent material, black matrix, aluminum metal back, and index fluorescent material. The electron gun(24) includes a cathode(24a) and many grid electrodes(24b-24e). The deflector(26) is mounted on the outer boundary of the funnel(20b). The focusing part(28) detects light from the index fluorescent material. The correcting element is formed by quadruple magnetic poles for restricting the size of the electron beam on other area than the center of the screen(22). The enhancement element is formed by pure Fe, ferrite or permalloy for focusing magnetic flux to a center of an electron beam passage hole.

Description

Cathode ray tube of beam index method {BEAM INDEX TYPE CATHODE RAY TUBE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube of a beam index type, and more particularly to a beam index type cathode ray provided with a magnetic quadrupole to correct a landing state of an electron beam scanned into a peripheral portion of a screen portion. It's about the coffin.

The cathode ray tube of the beam index method is a cathode ray tube designed to compensate for the problems of the ordinary cathode ray tube. The cathode ray tube drives the electron gun unit by synchronizing the index signal sensed by the electron beam with a color signal provided from the outside of the cathode ray tube. The electron beam generated by the electron gun has a mechanism capable of realizing a predetermined image by always landing on the phosphor at a desired position.

As an advantage of the beam index type cathode ray tube, the shadow mask, which is a color sorting means, is not employed. Therefore, the miss landing of the electron beam due to the shadowing of the shadow mask can be prevented, and a color image can be realized with a single electron beam. Therefore, in the conventional cathode ray tube, it is possible to prevent misconvergence caused by misalignment of R, G, and B electron beams.

On the other hand, in the beam index type cathode ray tube, it is important to adjust the size of the electron beam to an optimal state so that the electron beam does not strike the phosphor of one color when it strikes the phosphor of one color.

However, in the cathode ray tube, the ground structure of the cathode ray tube is landed out of the center of the screen unit 1, as shown in FIG. 7 due to the spherical aberration resulting from the electron gun and the spherical aberration derived from the deflector. The electron beam 3 increases the size of the horizontal component and the vertical component compared to the electron beam 5 landing at the center of the screen portion 3. In this case, when the size of the horizontal component of the electron beam is increased, this causes a decrease in color purity of the screen portion, and an increase in the size of the vertical component causes a decrease in the vertical resolution of the screen portion. The larger the size of and the flatter the windshield, the more appears.

In order to prevent the above phenomenon, conventionally, when the electron beam is finally landed on the screen, the electron beam is subjected to the influence of the magnetic field formed from the magnetic quadrupole, which is any magnetic field generating device, before passing through the magnetic field region generated in the deflection device. It can be landed in good condition.

That is, as shown in FIG. 8, a magnetic field generator consisting of solenoids 9, 11, 13, and 15 is provided on the neck 7 of the cathode ray tube, and the electron beam generated by the electron gun and scanned into the corner of the screen portion ( Before the 17) enters the deflecting device, the shape is deformed under the influence of the magnetic field generated by the solenoids 9, 11, 13 and 15 (see the line of magnetic force indicated by the dotted line in the drawing). Conventionally, the solenoids 9, 11, 13, and 15 were formed by winding a coil around a ferrite core mainly made of a paramagnetic body.

For reference, in the case of a beam index type cathode ray tube having a diameter of 29.1 mm, the core is formed of pure iron having good transmittance, and the coil is wound about 200 times to form the above magnetic quadrupole.

However, in the cathode index tube of the beam index method using the magnetic quadrupole, the amount of current consumed through the magnetic quadrupole is not small, resulting in a large power consumption. Substantially, in the above-described beam index type cathode ray tube, it is known that the electron beam can be corrected to some extent only by using a high current of about 1 A for each solenoid constituting the magnetic quadrupole.

In addition, the magnetic quadrupole should be mounted so that the centers of the solenoids arranged in all directions of the electron beam are exactly centered with respect to the electron beam according to their structural relationship. For example, when the solenoid arrangement is not centered and shows a small amount of error, it is impossible to accurately correct the electron beam, but rather forms an unnecessary magnetic field so that when the electron beam is scanned to the sine part, it is not a desired phosphor. By hitting the phosphors, there is a problem of rapidly deteriorating the screen quality.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a beam index type cathode ray tube for correcting the size of an electron beam using a magnetic quadrupole made of a solenoid. It is to provide a cathode ray tube of the beam index method to improve the.

In addition, another object of the present invention is to provide a cathode ray tube of the beam index method to reduce the power consumption by lowering the current value required to correct the size correction of the electron beam.

1 is a side cross-sectional view showing a cathode ray tube of the beam index method according to an embodiment of the present invention,

2 is a cross-sectional view illustrating an important part of a beam index type cathode ray tube according to an embodiment of the present invention;

3 is a perspective view showing a reinforcing member according to an embodiment of the present invention,

4 is a view for explaining the operation of the correction means according to an embodiment of the present invention,

5 and 6 are perspective views showing a reinforcing member according to another embodiment of the present invention,

FIG. 7 is a view illustrating a state of an electron beam landing on each screen portion of a conventional beam index cathode ray tube,

8 is a cross-sectional view showing a conventional magnetic quadrupole mounted on a beam index cathode ray tube.

Accordingly, the present invention to realize the above object,

A tube in which the inside is kept in a vacuum state; A screen unit including a phosphor stripe, a black matrix, an aluminum film, and an index stripe formed on one side of the inner surface of the tube; An electron gun section provided on the tube so as to face the screen section; A deflection portion installed in the tube to deflect an electron beam scanned from the electron gun portion to the screen portion; A light collecting part installed on the tube to sense light emitted from the index stripe; Correction means for correcting the size of the electron beam provided at a portion of the tube where the electron gun is installed at a predetermined angle with respect to a horizontal axis passing through the tube axis of the tube and a vertical axis disposed orthogonally to the horizontal axis; And at least one or more reinforcing means disposed at a position corresponding to the correcting means, the reinforcing means for reinforcing size correction of the electron beam.

In the beam index type cathode ray tube, the correction means is preferably formed by opposing magnetic poles having the same polarity on the same center line, and the reinforcement means is made of high permeability material such as pure iron, ferrite permalloy, etc. It is preferably provided on the electrode electron beam through hole forming surface of the electron gun portion.

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

1 is a side cross-sectional view showing a cathode ray tube of the beam index method according to an embodiment of the present invention.

As shown in the drawing, the cathode ray tube is shaped as a tube 20 which maintains an internal atmosphere in a vacuum state, and the tube 20 is largely formed of a panel 20a and a panel 20a forming a front glass. It includes a funnel 20b connected to the rear and a neck 20c extending to the rear of the funnel 20b.

In the tube 20, a screen portion 22 including R, G and B phosphors is formed on an inner surface of the panel 20a, and in addition to the R, G and B phosphors, the screen portion 22 is formed. A black matrix formed between the R, G and B phosphors, an aluminum metal bag formed over the R, G and B phosphors and the black matrix, and an index phosphor formed over the aluminum metal bag are further included.

In addition, the inside of the neck 20c includes a cathode 24a and a plurality of (first to fourth) grid electrodes 24b, 24c, 24d, and 24e to scan a single electron beam into the screen unit 22. The electron gun 24 is provided, and a deflecting portion 26 for deflecting the electron beam and a light collecting portion for detecting light emitted from the index phosphor of the screen portion 22 on the outer circumference of the funnel 20b. 28 is installed.

In addition, an electron beam formed in the electron gun portion 24 is deflected by the deflection portion 26 on a portion of the tube 20 where the electron gun portion 24 is installed, that is, on the outer circumference of the neck 20c. As a means for preventing the electron beam from being enlarged in the horizontal and vertical components when scanned to other portions except the central portion of the section 22, the following correction means is provided.

That is, the correction means has the same center at a predetermined angle (θ) with respect to the horizontal axis (H) passing through the tube axis (Z) of the tube (20) and the vertical axis (V) orthogonal to the horizontal axis (H). The magnetic poles having the same polarity on the line are disposed to face each other, and the above-described action can be achieved by the influence of the magnetic field formed by the magnetic poles.

As shown, the correction means first consists of a quadrupole pole, wherein the pole consists of solenoids 30, 32, 34 and 36. The solenoids 30 and 34 disposed on one center line L1 are formed to form magnetic poles of the N pole, and the solenoids 32 and 36 disposed on the other center line L2 are magnetic poles of the S pole. Is made to form. The plurality of solenoids 30, 32, 34, and 36 are electrically connected to the size correction circuitry 40 of the electron beam to receive current therefrom. For reference, the current supplied from the correction circuit unit 40 changes in response to the deflection operation of the electron beam.

On the other hand, in the present invention, when correcting the size of the electron beam by the action of the correction means as described above, the solenoids (30, 32, 34, 36) are not exactly disposed on the center line (L1, L2) does not affect the electron beam In case the magnetic field formation cannot be formed satisfactorily, the following reinforcing means are provided.

The reinforcing means is disposed at least one or more positions at positions corresponding to the solenoids 30, 32, 34, and 36 to enhance the correction of the size of the electron beam. In the electrode of 24, it is provided in the 3rd grid electrode 24d. Specifically, the reinforcing means is provided with a high permeability material (for example, pure iron, ferrite, permalloy, etc.), that is, the center of the electrode of the electron gun 24, that is, the electron beam passing hole 240d through which the electron beam passes. Consists of a reinforcing member 42 for concentrating the magnetic flux to the center, it is installed on the surface 242d formed with the electron beam through hole 240d of the third grid electrode 24d.

As shown in FIG. 3, the reinforcing member 42 of the present embodiment is selected from any one of the above materials and is provided in a thin plate shape, and is directed toward one side end, that is, the electron beam passing hole 240d for enhancing its function (Fig. Arrow direction) can be formed sharply on one side.

In the present embodiment, as shown in FIG. 2, all of the reinforcing members 42 are provided at four positions of the third grid electrode 24d around the electron beam through hole 240d.

Accordingly, the beam index cathode ray tube having the reinforcing member 42 scans an electron beam from the electron gun portion 24 to the screen portion 22 in accordance with a color signal synchronized with the index signal. In an implementation, the four solenoids 30, 32, 34, 36 are first applied to the electron beam scanned to a portion other than the center portion of the screen portion 22 before the electron beam passes through the deflection portion 26. To receive the force of the forming magnetic field.

FIG. 4 is a diagram showing the direction and magnitude of the force received by the electron beam by the magnetic field formed by the solenoids 30, 32, 34, and 36. The arrow direction shown by the solid line in the drawing is represented by the magnetic field. The arrow direction shown by the dotted line showing the direction of the magnetic force line formed shows the direction of the force which an electron beam receives.

As shown in the drawing, the electron beam is corrected in such a way that the electron beam is formed longer in the vertical direction when viewed as a whole by receiving more force in the vertical direction than in the horizontal direction by the solenoid forming the magnetic field.

When the solenoid 30, 32, 34, 36 is acting, the reinforcing member 42 serves to collect magnetic force lines formed at the solenoids 30, 32, 34, and 36 toward the electron beam. . That is, as shown in FIG. 2, the reinforcing member 42 induces the magnetic force lines formed in the solenoids 30, 32, 34, and 36 to the electron beam to have a high magnetic flux density, thereby increasing the size of the electron beam. Strengthen the degree of correction.

In this embodiment, the magnetic field is applied to the electron beam by applying the reinforcing member 42 to a 29-inch beam index cathode ray tube having a diameter of 29.1 mm in the neck 20c. As a result of the test of the strength of the coil, it can be seen that the conventional coil has the same effect as the number of windings of the coils constituting the solenoids 30, 32, 34 and 36 and the amount of current supplied thereto. have.

For example, when the solenoids 30, 32, 34 and 36 are conventionally configured, when the number of coils wound around the core of the solenoid is 200 turns and the amount of current supplied thereto is 1.0 A, the size of the electron beam Although the correction could be achieved with a predetermined result, in the present invention, the number of turns of the coil is 20 times (in this case, the core is made of ferrite) and the size of the electron beam is corrected to the same extent as before even when the current amount is 0.1A. Could achieve.

Further, even if the number of windings of the coil and the amount of current flowing through the coil were reduced according to the material of the reinforcing member 42, the strength of the magnetic field applied to the electron beam could be made the same as before. If the coil 42 is made of pure iron, the number of windings and the current amount of the coil is 1/100 of the conventional value, and when the reinforcing member 42 is made of ferrite or permalloy, it is 1/120 to 1/130 of the conventional value. Could be lowered.

As described above, in the present invention, when the size of the electron beam is corrected by the quadrupole method consisting of the solenoids 30, 32, 34, and 36, the current value and the coil winding degree required by the reinforcing member 42 can be lowered than before. Will be.

5 and 6 is a perspective view showing a reinforcing member according to another embodiment of the present invention, the reinforcing member 44 shown in Figure 5 has the same overall shape as the reinforcing member 42 of the above-described example, the inside In the longitudinal direction, a plurality of recesses 44a are formed. In other words, the reinforcing member 44 generates heat through the recess 44a when heat is generated due to an eddy current or a skin effect in the process of inducing the magnetic force line during the above-described action. It was configured to reduce the degree.

In addition, the reinforcing member 46 shown in FIG. 6 has a recessed portion 46a similarly to the reinforcing member 44 of the above-described example, as well as a width of the reinforcing member 46 at one end thereof. A cover portion 46b having a width Wl larger than Ws is formed. When the reinforcing member 46 induces a magnetic force line from the solenoids 30, 32, 34, and 36, the magnetic force line can be induced in a wider range through the cover portion 46b, thereby improving efficiency. It can be increased even more.

On the other hand, in the above example, it can be seen that the shape of the reinforcing member installed in all directions of the third grid electrode has the same shape as in FIG. 2, but this is not necessarily the case. For the optimization of the material, the material, shape, and other sizes may be made separately. In addition, the magnetic pole may be provided as a permanent magnet instead of a solenoid.

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 beam index type cathode ray tube according to the present invention more effectively corrects the size of the electron beam landing on the corner of the screen in a quadrupole manner due to the reinforcement member made of a high permeability material installed in the electrode of the electron gun. It can be achieved.

Furthermore, even if the magnetic pole of the quadrupole is not accurately opposed to the electron beam at the center, the magnetic field formed by the solenoid of the quadrupole through the reinforcing member effectively affects the electron beam. (The increase in the size of the electron beam due to the unbalanced magnetic field, the separate provision of the centering deflection device to correct this, etc.) can be eliminated.

Claims (11)

A tube in which the inside is kept in a vacuum state; A screen unit including a phosphor stripe, a black matrix, an aluminum film, and an index stripe formed on one side of the inner surface of the tube; An electron gun section provided on the tube so as to face the screen section; A deflection portion installed in the tube to deflect an electron beam scanned from the electron gun portion to the screen portion; A light collecting part installed on the tube to sense light emitted from the index stripe; Correction means for correcting the size of the electron beam provided at a portion of the tube where the electron gun is installed at a predetermined angle with respect to a horizontal axis passing through the tube axis of the tube and a vertical axis disposed orthogonally to the horizontal axis; And Reinforcing means disposed at least in a position corresponding to the correcting means to enhance the correction of the size of the electron beam; Cathode ray tube of the beam index method comprising a. The method of claim 1, A cathode ray tube of a beam index type, wherein the correction means is arranged so that magnetic poles having the same polarity are disposed on the same center line. The method of claim 2, The cathode ray tube of the beam index method wherein the magnetic pole is made of a solenoid. The method of claim 2, The cathode ray tube of the beam index method wherein the magnetic pole is made of a permanent magnet. The method of claim 1, The cathode ray tube of the beam index method, wherein the reinforcing means is installed on the electrode of the electron gun section. The method of claim 5, The cathode ray tube of the beam index method, wherein the reinforcing means is provided on the electron beam through hole forming surface of the electrode. The method according to claim 1 or 5 or 6, The reinforcement means is provided with a high permeability material beam index type cathode ray tube made of a reinforcing member for concentrating the magnetic flux to the electrode center of the electron gun. The method of claim 7, wherein One side end portion of the reinforcing member sharply formed cathode ray tube of the beam index method. The method of claim 7, wherein Beam reinforcing cathode ray tube of the reinforcing member is made of any one of pure iron, ferrite or permalloy. The method of claim 7, wherein The cathode ray tube of the beam index type formed with a plurality of recesses for reducing heat generation in the reinforcing member. The method of claim 7, wherein When the width in the unidirectional direction of the reinforcing member is Ws, a beam index type cathode ray tube having a cover portion having a width (Wl) greater than the width (Ws) on one side end of the reinforcing member.