KR19980042445A - Color cathode ray tube with improved beam convergence - Google Patents

Abstract

The color cathode ray tube includes a vacuum envelope formed of a panel portion containing a fluorescent surface on the inner surface, a neck portion, a funnel portion connecting the panel portion and the neck portion, a three beams embedded in the neck portion generating one center electron beam and two side electron beams, Mounted in-line electron gun, deflector, adjuster field generator mounted on the neck to move the two side electron beams in opposite directions, and mounted on the neck portion to generate the fixed magnetic field and move the two side electron beams in opposite directions Self-structure.

Description

Color cathode ray tube with improved beam convergence

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and more particularly to a color cathode ray tube having a convergence adjusting device.

The cathode ray tube is constructed by deflecting and irradiating an electron beam from an electron gun onto a fluorescent surface serving as the display surface, thereby forming an image corresponding to the intensity of the electron beam on the fluorescent surface. Therefore, when the electron beam is deflected correctly, it is possible to form a high fidelity image. However, as a premise, the electron beam must be accurately irradiated to the intended location of the fluorescent surface.

In particular, in a configuration in which three electron beams emitted from three electron guns must be irradiated to each of three adjacent phosphors emitting different colors, as in the case of a color display cathode ray tube, precise adjustment of the electron beam is further required. .

If even one of the electron beams from one electron gun therein is not irradiated with the intended phosphor, color deviation occurs in one pixel constituted by adjacent three-color phosphors emitting three different colors.

Accordingly, the color cathode ray tube is provided with a convergence adjusting device at the outer periphery of the neck portion containing the electron gun of the vacuum envelope. This convergence adjusting device has a different number of magnetic poles in a pair of magnetic plates having the same number of magnetic poles that can rotate around the neck portion independently (for example, for dipole field generation and quadrupole field generation). , Three pairs for six-pole field generation each have a plurality of pairs). By rotating each magnetic plate, the trajectory of each electron beam from each electron gun can be adjusted so that the electron beam is finely adjusted and accurately irradiated to a predetermined point on the surface of the phosphor.

However, the cathode ray tube constructed as described above has a bright red color (R) emitted by the red phosphor layer by the red electron beam when the display surface is small (for example, the diagonal dimension of the effective display surface is 41 cm or 46 cm). Spots, bright green (G) spots emitting from the green phosphor layer by the green electron beam, and bright blue (B) spots emitting from the blue phosphor layer by the blue electron beam sometimes appear too close to each other. Sometimes it is recognized as a point. For this reason, in the convergence adjustment of such a cathode ray tube, the adjustment range is very small, and thus accurate adjustment cannot be made.

Moreover, even when the display surface is relatively large, bright red (R) spots emitted by the red electron beam, bright green (G) spots generated by the green electron beam, and bright blue (B) emitted by the blue electron beam Since each of the spots is separated by a relatively large distance, they can be recognized as three separate spots with the naked eye. However, in the case of the convergence adjustment, the one that is separated by the large distance may be easier to adjust.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a color cathode ray tube in which convergence adjustment can be easily performed. In order to achieve the above object, according to the first embodiment of the present invention, a color cathode ray tube includes a panel portion including a fluorescent surface on an inner surface thereof, a neck portion, and a vacuum envelope comprising a panel portion and a funnel portion connecting the panel portion and the neck portion. Three beams built into the neck, an inline electron gun, a deflector mounted near the change region between the funnel and the neck, and two side electron beams that generate one center electron beam and two side electron beams A first regulating magnetic field generating device mounted on the neck part, a second regulating magnetic field generating device mounted on the neck part moving the two side electron beams in the same direction, and a fixed magnetic field to generate two side electron beams. At least a magnetic structure mounted to the neck portion moving in opposite directions to each other. The color cathode ray tube constructed in this way can rotate the newly installed one magnetic pole plate for four pole magnetic fields, for example, so that the gap between the red and blue electron beams located on both sides of the green electron beam can be adjusted. Modify the trajectory of the red and blue electron beams by making them larger or smaller. Bright red (R) spots emitting from the red phosphor layer by the red electron beam, bright green (G) spots emitting from the green phosphor layer by the green electron beam, and bright blue (B) emitting from the blue phosphor layer by the blue electron beam Since the spots appear to be far apart from each other, the width of the electron beam convergence composition is increased. Therefore, it is possible to provide a color cathode ray tube which can adjust the convergence accurately.

1 is a side view showing an embodiment of the convergence adjusting means provided in the cathode ray tube according to the present invention;

2 is a partial cutaway side view showing an embodiment of a cathode ray tube according to the present invention;

3 is an exploded perspective view showing one embodiment of the convergence adjusting means provided in the cathode ray tube according to the present invention;

4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

5 is a plan view showing an embodiment of a magnetic plate for two poles provided in the convergence adjusting means;

6 is a plan view showing an embodiment of a four-pole magnetic plate provided in the convergence adjusting means according to the present invention;

7 is a plan view showing one embodiment of a six-pole magnetic plate provided in the convergence adjusting means;

8A and 8B are explanatory views showing the effect of the color cathode ray tube according to the present invention;

Fig. 9 is a plan view showing another embodiment of the four-pole magnetic plate used in the convergence adjusting means according to the present invention.

Fig. 10 is a plan view showing another embodiment of the six-pole magnetic plate used in the convergence adjusting means.

* Description of the symbols for the main parts of the drawings *

One; Vacuum envelope 1A: Panel part

1B: Neck 1C: Funnel

2: electron gun structure 3: three electron beams

4: phosphor layer 5: shadow mask

6: deflection yoke 7: convergence adjusting means

11: holder 11A: flange

11B: side wall portion of the holder 11C: matching portion of the holder

11D: Clamp mount 12: Magnetic plate

12A: Magnetic plate for generating 2-pole field 12B: Magnetic plate for generating 2-pole field

12C: Magnetic pole for magnetic pole generation 12X: Magnetic pole for magnetic pole generation

12P: Tab of magnetic plate 13: Spacer ring

14: spacer ring 15: locking ring

20: metal clamp 30: magnet

4 (B), 4 (G), 4 (R): blue, green, red beam spot on phosphor

Fig. 2 is an overall schematic view showing an embodiment of a cathode ray tube according to the present invention. The vacuum envelope 1 of the cathode ray tube is made of glass. The envelope 1 includes a panel portion 1A serving as a display portion of the cathode ray tube, a neck portion 1B containing an electron gun structure, and the panel. It consists of the funnel part 1C which connects part 1A and the neck part 1B smoothly. The panel portion 1A has a diagonal size of the effective display surface, for example, 41 cm or 46 cm.

The electron gun structure 2 disposed inside the neck portion 1B has a configuration in which three electron guns are integrally arranged in the X-axis direction in the drawing, and from each electron gun, red (R) light emitting and green ( G) Three electron beams 3 for light emission and blue (B) light emission are directed toward the panel portion 1A.

In addition, the phosphor layer 4 is formed on the inner wall surface of the panel portion 1A over its entire area, and red (R) light emitting and green (G) are emitted in the region corresponding to one pixel of the phosphor layer 4. The three-color phosphors for light emission and blue (B) light emission are formed adjacent to each other. The electron gun structure 2 has three electron beams 3 emitted from the electron gun structure 2 for red (R) light emission, green (G) light emission, and blue (B) light, which constitute one pixel for color display. It is configured to be irradiated with each phosphor for light emission.

In this case, the shadow mask 5 is disposed adjacent to the inner wall surface on which the phosphor response 4 of the panel portion 1A is formed, and the shadow mask 5 is formed with an electron beam penetrating sphere, and one electron beam penetrating sphere is colored. Corresponds to one pixel for display.

The electron gun structure 2 is configured such that the three electron beams 3 emitted from the electron gun structure 2 can pass through the same electron beam penetrating aperture on the shadow mask 5, thereby providing a shadow mask 5. Each of the phosphors for color emission forming one pixel arranged in correspondence with the electron beam transmission sphere on the back side is configured to be irradiated.

On the other hand, the deflection yoke 6 is provided in the part adjacent to the neck part B of the funnel part 1C in the outer side of the vacuum crisis 1. By the action of the deflection yoke 6, the three electron beams 3 emitted from the electron gun structure 2 are deflected in the horizontal direction or in the vertical direction, so that all of the pixels of the phosphor layer 4 are fully covered, for example. Scanning is performed from the upper left to the lower right.

A convergence adjusting means 7 is provided outside the neck portion 1B on the outside of the vacuum envelope 1. The convergence adjusting means 7 causes the non-deflected electron beam 3 emitted from the electron gun structure 2 to be irradiated to the center of the phosphor layer 4, so that some of the three non-deflected electron beams of the phosphor layer 4 When irradiated to a position deviated from the center, the convergence adjusting means 7 is configured to adjust the trajectory of the electron beam so that three non-deflected beams are irradiated to the center of the phosphor layer.

1 is a side view showing the convergence adjusting means 7 in detail. Denoted at 11 is a holder mounted around the neck 1B of the vacuum envelope 1 of the cathode ray tube. The holder 11 is not shown in detail in FIG. 1, but as shown in FIG. 3, which is an exploded perspective view of the convergence adjusting means 7, the holder 11 is a circular plate inserted around the neck portion 1B. A flange 11A formed at one end thereof, a side wall portion 11B extending from the flange 11A over the other end of the holder, a locking ring 15 to be described later; It consists of 11 C of matching threaded parts, and 11 C of clamp mounting parts for fixing a circular plate around the neck part 1B by the metal clamp 20. As shown in FIG.

As shown in Fig. 3, the holder 11 has a pair of magnetic poles for generating a pair of magnetic poles 12A, a magnetic pole for generating four poles for a magnetic pole 12X, and a pair of magnetic poles for generating a pair of four poles. The clamp mounting portion is interposed between the magnetic plate 12B, a pair of six pole magnetic field generating magnetic plates 12C, and a pair of magnetic plates 12A and one magnetic plate 12X. It is inserted sequentially from the (11D) side.

Each of the magnetic plates has a ring shape that can rotate around the holder 11 independently. The detailed structure is demonstrated later.

The spacer ring 13 has a ring shape with a structure in which the holder 11 is inserted, and a protrusion is not shown in FIG.

When the holder 11 is inserted into the spacer ring 13, the protrusion is engaged with a groove (not shown) formed in the Z direction on the outer circumferential surface of the holder 11, so that the spacer ring 13 Suppress the rotation of That is, when the magnetic plate rotates, the spacer ring 13 prevents the rotation of other adjacent magnetic plates 12.

Thus, the locking ring 15 is attached to the holder 11 in which a plurality of magnetic plates are mounted via the spacer ring 13 via the spacer ring 14 having substantially the same shape as the spacer ring 13. The spacer ring 14 is interposed between the magnetic plate and the locking ring 15. The locking ring 15 is configured to be mounted in conformity with the holder 11, and a mating portion is formed on an inner wall surface into which the holder 11 is inserted, and the mating portion of the locking ring is a mating portion of the holder 11. To conform to (11C).

After the convergence adjustment is completed by each rotation of each magnetic plate, the magnetic plates whose one end is held by the flange 11A are tightly tightened by the locking ring 15, and the rotation of the magnetic plate is prevented. . At this time, the spacer ring 14 functions to prevent the rotation of the locking ring 15 from being transmitted to the magnetic plates 12A, 12X, 12B, and 12C.

Each of the dipole magnetic field generating magnetic plates 12A has a tap 12P as shown in FIG. 4, which is a cross-sectional view taken along line IV-IV of FIG. 3. In the convergence adjustment, the magnetic plate 12A can be rotated by rotating the tab 12P in the arrow direction shown in FIG. The tab 12P is located in each of the four magnetic pole plates 12X for one pole, the pair of magnetic poles 12B for the four pole magnetic fields, and the pair of magnetic poles 12C for the six pole magnetic fields, respectively. The magnetic plates 12A, 12B, 12X, and 12C are made by partially magnetizing those magnetic plates 12 or by inserting small magnet pieces into a plurality of positions of a plurality of nonmagnetic materials. The number of magnetized positions or arrangement of magnetized positions in the magnetic plate depends on the type of magnetic plate.

In the bipolar magnetic field generating magnetic plate 12A, as shown in Fig. 5, two poles each magnetized with different polarities are located at substantially the same interval width along the circumferential direction. In the four pole magnetic field generating magnetic plates 12B and 12X, as shown in Fig. 6, four poles each magnetized with different polarities are alternately positioned along the circumferential direction at substantially equal interval widths. In the six-pole magnetic field generating plate 12C, six poles each magnetized with different polarities are alternately positioned along the circumferential direction at substantially the same interval widths. A method of adjusting convergence using magnetic plates for two-pole, four-pole, and six-pole magnetic fields is described in detail in U.S. Pat. No. 3,725,831.

As shown in FIG. 9 instead of the quadrupole magnetic plate 12B or 12X magnetized at four places as the magnetic plate for the four-pole magnetic field, a magnet in which two magnet pieces 30 are arranged in two places. As the magnetic plate for six-pole magnetic field or a magnetic plate for six-pole magnetic field, instead of the six-pole magnetic plate 12C magnetized at six places, as shown in FIG. 10, three magnet pieces 30 are arranged in three places. It is also possible to use a magnetic plate.

The operation principle of the quadrupole and six-pole magnets shown in FIG. 10 is described in detail in US Patent No. 3,808,570.

As described above, each of the magnetic pole plates 12A, 12B, 12X, and 12C independently and arbitrarily circumscribes around the side wall portion 11B surface of the holder 11 by the respective tabs 12P. It is arranged to rotate. Therefore, the arrangement state of each magnetic pole plate is changed, whereby the magnetic field distribution of the electron beam transmitting portion in the neck portion 1B is changed.

Therefore, when the non-deflected electron beam 3 is irradiated to a position deviated from the center of the fluorescent surface, the electron beam can be adjusted to be irradiated to the center of the fluorescent surface by changing the magnetic field described above.

The convergence adjusting means 7 is made of an insulating material such as synthetic resin, except for the metal fixing part 11D and the magnet fitted to the magnetic pole plate 12.

In this embodiment, one quadrupole magnetic pole generating plate 12X is added to the convergence adjusting means of the prior art. This added four-pole magnetic plate 12X has a pair of two-pole magnetic plates 12A and a pair of four-pole magnetic plates 12B in FIGS. 1 and 3. It is arrange | positioned through the spacer ring 13 between and. However, the scope of the present invention is not limited to this, and between the flange 11A and the pair of dipole magnetic plates 12A or the quadrupole magnetic plates 12B and the six pole magnetic fields It may be arranged between the magnetic plate 12C or between the magnetic plate 12C for the six-pole field and the locking ring 15.

The four-pole magnetic plate 12X described above is operated independently of the other magnetic plates, and the four-pole magnetic plate 12X is appropriately rotated around the neck portion 1B, so that the red electron beam and It is possible to enlarge or approach each distance of the blue electron beam with respect to the green electron beam located therebetween.

In the above-described embodiment, the quadrupole magnetic plate 12X is additionally installed, but instead of such a configuration, it is possible to magnetize or insert a magnet into either the spacer ring 13 or the spacer ring 14. The magnetic field may be formed so that the tab 12P may be provided to rotate around the neck portion 1B.

Thereby, on the display surface, the bright beam spot 4 (R) on the red phosphor emitted by the red electron beam, the bright beam spot 4 (G) on the green phosphor emitted by the green electron beam, and The positional relationship of the bright beam spots 4 (B) on the blue phosphor emitted by the blue electron beam is as shown in Fig. 8B from the state in which the spots are too close to each other as shown in Fig. 8A. Can be converted to a state.

In the state of FIG. 8A, three beam spots may be recognized as one point with the naked eye. In the state of FIG. 8B, three bright beam spots may be recognized as three separate beam spots.

In this embodiment, when the red beam spot 4 (R) and the blue beam spot 4 (B) appear too close to the green beam spot 4 (G), they are dropped from the green beam spot to an appropriate position. In the present invention, when the red beam spot 4 (R) and the blue beam spot 4 (B) are too far from the green beam spot 4 (G), they are the green beam spot 4 (G). ) Can also be used to bring them closer to the proper position. In this case, the magnetic pole plate 12X may be rotated 90 degrees.

The electron gun of the color cathode ray tube was designed to perform the convergence of three electron beams at the center of the fluorescent surface. It is desirable to use one electron gun within the size and composition of the tube for cost savings. When using electron guns designed for cathode ray tubes with special tube sizes or configurations for cathode ray tubes with different tube sizes and configurations, three beam spots may not be placed at the proper distance at the center of the fluorescent surface. . However, such a problem is solved by the present invention.

According to the present invention, when the convergence adjustment is performed by observing the display surface, the width of the adjustment can be sufficiently adjusted, and accurate convergence can be performed.

In the above embodiment, the convergence adjusting means 7 is provided with a pair of magnetic pole plates for two-pole magnetic field, one pair of magnetic pole plates for four-pole magnetic field, and one pair of magnetic pole plates for six-pole magnetic field, but It is not limited to what provided all these, Moreover, what provided with the magnetic plate of another pole may also be sufficient.

As is apparent from the above description, the cathode ray tube according to the present invention enables accurate convergence adjustment.

Claims (19)

A vacuum envelope including a panel portion having a fluorescent surface on an inner surface, a neck portion, and a panel portion connecting the panel portion and the neck portion, A three-beam, in-line electron gun embedded in the neck portion generating one center electron beam and two side electron beams, In the color cathode ray tube having at least a deflection device mounted near the change region between the funnel portion and the neck portion, A first regulating magnetic field generating device mounted to the neck portion for moving the two side electron beams in opposite directions; A second regulating magnetic field generating device mounted to the neck portion for moving the two side electron beams in the same direction; And a magnetic structure mounted on the neck portion for generating a stator field to move the two side electron beams in opposite directions. The color cathode ray tube according to claim 1, wherein the first regulating magnetic field generating device generates a four-pole pattern. The color cathode ray tube according to claim 1, wherein said first regulating magnetic field generating device has a pair of four-pole magnetic field rings capable of rotating independently. The color cathode ray tube according to claim 1, wherein the first regulating magnetic field generating device has a pair of rings each of which four magnetized around the neck portion are arranged in alternating polarity at 90 ° intervals. The magnetic field generating device of claim 1, wherein the first regulating magnetic field generating device has a pair of rings each having two identical pole magnets arranged so that the opposing magnets in the neck are radially directed toward the neck. Color cathode ray tube made with. The magnetized 4 according to claim 1, wherein the magnetic structure has four magnetized positions arranged at intervals of 90 ° around the neck portion, and magnetized four having alternately arranged polarities of ends closest to the four magnetized portions of the neck portion. A color cathode ray tube comprising a point. The color cathode ray tube according to claim 6, wherein the first regulating magnetic field generating device generates a four-pole pattern. 7. The color cathode ray tube according to claim 6, wherein said first regulating magnetic field generating device has a pair of four-pole magnetic field rings capable of rotating independently. The color cathode ray tube according to claim 6, wherein the first regulating magnetic field generating device has a pair of rings each of which four magnetized around the circumference of the neck portion are arranged alternately in polarity at 90 ° intervals. 7. The magnetic field generating device of claim 6, wherein the first regulating magnetic field generating device has a pair of rings each having two identical pole magnets arranged so that the opposing magnets in the neck are radially directed toward the neck. Color cathode ray tube made with. 2. The color cathode ray tube according to claim 1, wherein said magnetic structure comprises two magnets of the same pole arranged on opposite sides of said neck so as to face radially toward said neck. The color cathode ray tube according to claim 11, wherein the first regulating magnetic field generating device generates a four-pole pattern. 12. The color cathode ray tube according to claim 11, wherein the first regulating magnetic field generating device has a pair of four-pole magnetic field rings capable of rotating independently. 12. The color cathode ray tube according to claim 11, wherein the first regulating magnetic field generating device has a pair of rings each of which four magnetized around the circumference of the neck portion are arranged alternately in polarity at 90 ° intervals. 12. The magnetic field generating device of claim 11, wherein the first regulating magnetic field generating device has a pair of rings each having two identical pole magnets arranged on opposite sides of the neck so that the magnets are radially directed toward the neck. Color cathode ray tube to say. The color cathode ray tube according to claim 1, wherein the magnetic structure generates a quadrupole magnetic field pattern. The color cathode ray tube according to claim 1, wherein the first regulating magnetic field generating device generates a four-pole magnetic field pattern and the second regulating magnetic field generating device generates a six-pole magnetic field pattern. The color cathode ray tube according to claim 1, wherein the cathode ray tube further includes a pair of dipole magnetic rings each magnetized across a diameter. In the color cathode ray tube provided with the electron beam convergence adjusting device which adjusts the trajectory of the electron beam from the electron gun built in the neck part of a vacuum envelope, A plurality of pairs of magnetic plates having the same number of magnetic poles and adapted to rotate the neck portion independently, the electron beam convergence adjusting device having the number of magnetic poles according to the pair; And a fixed quadrupole magnetic field generating magnetic plate arranged so that all of the centers of the plurality of pairs of magnetic plates coincide with each other.