KR920000940B1 - The color picture tube and the deflection yoke apparatus - Google Patents

Abstract

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Description

Collar receiving tube and deflection device

1 to 15 are explanatory diagrams of embodiments of the present invention.

1 is a configuration diagram of a line-type color water pipe of a self-convergence method according to the first embodiment.

2 is a perspective view showing the arrangement of the upper and lower pairs of permanent magnets at the electron barrel side end portions of the deflecting device.

3 is a perspective view showing the shape of a permanent magnet.

4A and 4B are views showing the configuration of the electron muzzle body of the color image tube described above, and an apparatus of the magnetic field control element, respectively.

5 is a diagram showing a configuration of an electron lens portion of the electron barrel.

6 is a view for explaining the effect of a pincushion type magnetic field formed by a pair of upper and lower permanent magnets on the spot of an electron beam.

7 is a view for explaining the static concentration action of the pincushion type magnetic field forming the same pair of upper and lower permanent magnets.

8 and 9 are views showing the configuration of the electron lens unit for obtaining the static concentration of the conventional electron muzzle body shown for comparison with the static concentration action of the pair of upper and lower permanent magnets, respectively.

10 is a view for explaining the function of the pin rotation symmetric lens of the pincushion type magnetic field to form a pair of upper and lower permanent magnets.

Fig. 11 is a perspective view showing the arrangement of a pair of permanent magnets each of the upper, lower, left, and right sides of the electron muzzle body side end portion of the deflecting device, which is the main portion of the second embodiment.

12 is a view for explaining a pincushion type magnetic field forming a pair of left and right permanent magnets.

FIG. 13 is a diagram for explaining a pincushion type magnetic field for forming a pair of permanent magnets each up, down, left and right.

14A and 14B are cross-sectional views showing the configuration of an electron gun body in which a pair of upper and lower permanent magnets are arranged, which is the configuration of the main part of the third embodiment, respectively, and a diagram showing the arrangement of the upper and lower pairs of permanent magnets and the magnetic field control element.

15A and 15B are cross-sectional views showing the configuration of an electron barrel in which a pair of permanent magnets are arranged up, down, left, and right, respectively, and a diagram showing the arrangement of each pair of the permanent magnets and the magnetic field control element.

16 is a block diagram of a conventional self-convergence inline color water tube.

17 is a perspective view showing a configuration of a deflection device mounted on a collar water pipe.

18 is an explanatory diagram of a spot shape of an electron beam deflected by a uniform magnetic field of the deflection apparatus.

19 is an explanatory diagram of a spot shape of an electron beam deflected by a nonuniform magnetic field of a deflection device.

20A and 20B are diagrams for explaining the action of a pincushioned horizontal deflection magnetic field and a barrel-type vertical deflection magnetic field on an electron beam, respectively.

* Explanation of symbols for the main parts of the drawings

5: fluorescent surface 20: electron gun sphere

21: deflection device 23: horizontal deflection coil

24 core 25 vertical deflection coil

27: electron barrel side end of deflection apparatus

28a, 28b: A pair of upper and lower permanent magnets

31: first grid 32: second grid

33: third grid 34: fourth grid

35: 5th grid 36: 6th grid

37: convergence cup 39a, 39b: hole through the center beam

40a, 40b: side beam through hole

41a, 41b: magnetic material 42: barrel-type vertical deflection magnetic field

43: Pincushion type magnetic field formed by a pair of upper and lower permanent magnets

50a, 50b: left and right pair of permanent magnets

51: pincushion type horizontal deflection magnetic field

52: pincushion type magnetic field formed by a pair of left and right permanent magnets

53: magnetic field formed between adjacent permanent magnets

B, R: pair of side beams G: center beam

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color receiver and a deflecting device for improving deflection aberration due to the deflection magnetic field of the deflecting device and improving focus characteristics. The color collar tube usually has an outer period 3 consisting of a panel 1 and a funnel 2, as shown in FIG. 16, and a shadow mask 4 having a plurality of electron beam through holes mounted inside the panel 1; On the inner surface of the panel 1, a phosphor screen 5 is formed, which is a three-color phosphor layer that emits blue, green, and red light. In the neck 6 of the funnel 2, an electron barrel 7 which emits three electron beams B, R and G is installed, and a three electron beam B which is emitted from the electron barrel 7 is provided. (G) is deflected in the horizontal and vertical directions by a deflecting device 9 mounted outside the boundary between the cone portion 8 and the neck 6 of the funnel 2 to scan the phosphor screen 5, thereby scanning the phosphor screen 5. It is a structure which displays a color image on (5). The deflection apparatus 9 has a pair of horizontal deflection coils 10 deflecting the three electron beams in the horizontal direction and a pair of vertical deflection coils 11 deflecting in the vertical direction as shown in FIG.

In order to display a correct image on the phosphor screen 5 in the color receiving tube, it is necessary to properly concentrate three electron beams B, R, and G over the entire phosphor screen 5. In particular, the in-line emits three electron beams (B) (R) (G) in a row arrangement through the same plane, which makes the electron muzzle 7 the center beam (G) and the pair of side beams (B) (R). By using the characteristic of the in-line electron muzzle as the type electron muzzle, the deflection magnetic field forming the deflecting device 9 is a specific non-uniform magnetic field so that the three electron beams (B) (R) ( There is a self-convergence inline color water tube that focuses G).

As a deflection magnetic field of this self-convergence in-line type color receiving tube, for example, a pincushion type horizontal deflection magnetic field is applied to a color receiving tube emitting three electron beams (B) (R) (G) arranged in a line through a common horizontal plane. And barrel-type horizontal deflection magnetic fields are known. By using such a magnetic field, three electron beams (B) (R) (G) arranged in a line through the same horizontal plane can be concentrated at one point on the phosphor screen 5. However, even when the magnetic field is constructed as described above, in-line color water pipes generate coma aberrations in which the convergence between the center beam G and the side beams B and R varies around the screen.

In order to correct this coma aberration, a magnetic body that is coupled to the rear leak magnetic field of the deflecting device is disposed in the electron gun barrel in Japanese Laid-Open Publication Nos. 51-26208 and 54-23208, and also the rear leak of such a deflecting apparatus. Japanese laboratories 57- have added an auxiliary coil which forms a strong pincushion type magnetic field by flowing a current synchronized with a deflection current flowing in a vertical deflection coil to the electromagnetic barrel side without using a magnetic body coupled with a magnetic field. See publication 45748.

However, even if the color receiving tube is constituted in this way, the spot of the electron beam on the phosphor screen is distorted due to the deflection.

That is, as shown in FIG. 18, the spot 13 of the electron beam deflected by the uniform magnetic field becomes approximately circular over the entire surface of the screen 14, but as shown in FIG. 19, the spot of the electron beam deflected by the nonuniform magnetic field ( 13), at the end of the horizontal axis (X axis) of the screen 14, the upper half of each of the electron beams B, R, and G is lowered and lowered by the pincushioned horizontal deflection magnetic field 15, as shown in FIG. 20A. Under the force of Lorenz, whose minute is pressed upward, it distorts the horizontal ellipse with its long axis as the major axis.

In addition, at the end of the vertical axis (Y axis) of the screen 14, the right half of each of the electron beams B, R, and G is in the right half by the barrel-type vertical deflection magnetic field 16 as shown in FIG. 20B. It is pressed to the left and receives Lorentz force and distorts it into a horizontal ellipse having the long axis as the long axis.

In particular, for a pair of side beams (B) (R), the magnitude of the force received from the left and right of the beam is different, and in the electron beam (B) on the left side of the screen and the electron beam (R) on the right side, the direction of the force is reversed. For this reason, the spots of the pair of side beams B and R at the vertical axis ends are inclined in the direction intersecting with each other as shown in FIG. 19 by "13B" and "13R". As a result, the focus characteristic at the periphery of the screen 14 is remarkably deteriorated by the deformation and bias of the beam spot caused by the horizontal or vertical deflection magnetic fields 15 and 16. In particular, the deterioration of the focus characteristic is a major factor that hinders the high performance of the electron barrel.

Therefore, in order to improve the focus at the periphery of the screen 14, it is necessary to sacrifice the focus at the center of the screen 14 so that the other design that emphasizes the uniformity of focus at the center and the periphery of the screen 14 must be made. .

In addition, the auxiliary coil of Japanese Unexamined Patent Application Publication No. 57-45748 uses the current synchronized with the deflection current flowing in the vertical deflection coil, and the following problem occurs. In other words, when the electron beam is deflected in the vertical axis direction, the magnetic beam is generated in the horizontal direction on the horizontal axis, and the electron beam is likely to collide with the neck wall of the funnel due to excessive deflection in the vertical axis direction from the electron barrel side of the deflection apparatus. On the screen, so-called neck shadows can be areas where the electron beam does not reach. In addition, this auxiliary coil has a structure in which a coil is wound around a magnetic material and a current is passed through the coil, which is expensive as a correction element and is difficult to reduce in price.

In addition, the deflection device is often used by varying the impedance according to the receiver of each set maker, and the current flowing through the deflection coil differs depending on the impedance difference. Therefore, in order to correct the action of the auxiliary coil for such a deflection device, it is necessary to change the shape of the auxiliary coil in accordance with the impedance of the deflection coil, which is bad for mass production.

As described above, the phosphor has a conventional inline electron muzzle which emits three electron beams in a row arranged through the same horizontal plane, and the three electron beams form a pincushion type horizontal deflection magnetic field and a barrel type vertical deflection magnetic field. There is a self-converging inline color water tube which focuses on the screen.

However, this color tube has a coma aberration in which the convergence between the center beam and a pair of side beams is changed around the screen.

In order to correct this coma aberration, a magnetic body coupled with the rear leak magnetic field of the deflecting device is disposed in the conventional electronic muzzle, and an auxiliary coil is provided on the electron muzzle side of the deflecting device to transmit a current synchronized with the vertical deflection current. Even in this configuration, the electron beam spot on the phosphor screen is distorted into a horizontal ellipse having the horizontal axis as the major axis at the horizontal axis end and the vertical axis end of the screen, and in particular, at the vertical axis end, the spots of the pair of side beams cross each other. Tilt to significantly deteriorate the focus characteristic at the periphery of the screen. Therefore, deterioration of the focus characteristic becomes a large factor that impedes the high performance of the electron barrel, and there is a problem such as inhibiting the improvement of the focus characteristic on the entire screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and reduces the distortion of the spot of the electron beam due to the deflection magnetic field of the deflection device, that is, the deflection aberration, thereby preventing deterioration of the focus characteristic at the periphery of the screen and providing good focus across the screen. It is an object to obtain a collar receiving tube having characteristics and a deflection device thereof.

A pincushioned deflection magnetic field that has an inline electron barrel that emits three electron beams in a row arranged through the same plane consisting of a center beam and a pair of side beams, and is emitted from this electron barrel. In the collar receiving tube and its deflecting device having a deflecting device having a first deflection coil for forming a second deflection coil for deflecting the above-described three electron beam in a direction orthogonal to the array direction, Compensating the deflection aberration due to the deflection magnetic field forming the second deflection coil on the path of the three electron beam between the deflecting device and the electron lens portion of the electron barrel to connect the aforementioned three electron beam on the phosphor screen, and A plurality of permanent magnets in which the strength and arrangement position of each generated magnetic field are set to generate a pincushion type magnetic field for static concentration of the electron beam. The established.

Also, in the color receiving tube and its deflecting device, a three-electron beam is arranged in the opposite direction in the axisymmetric with respect to the central axis of the deflecting device on the path of the three-electron beam between the deflecting device and the lens portion of the electron barrel. Each pair is arranged in the same direction as the arrangement direction and in the direction orthogonal to the arrangement direction of the three electron beams, and each generated magnetic field is generated to generate a pincushion-type deflection magnetic field that compensates for deflection aberration by the deflection magnetic field forming the second deflection coil. A plurality of permanent magnets, each of which has the strength and arrangement position, are installed. In addition, in addition to the permanent magnet, the coma aberration correction device, which is a magnetic material that is coupled to the rear leakage magnetic field of the deflection device, is installed in the collar receiving tube.

In addition, a pair of side gaps between the permanent magnets arranged in the direction orthogonal to the arrangement direction of the 3 electron beams among the permanent magnets arranged in the same direction as the arrangement direction of the 3 electron beams and the direction perpendicular to the arrangement direction of the 3 electron beams. It was smaller than the spacing of the beams in the array direction.

As described above, the pincushion type compensates the deflection aberration by the deflection magnetic field that forms the second deflection coil on the path of the three electron beams between the deflection apparatus and the electron lens portion of the electron barrel and performs static concentration of the three electron beams. When the permanent magnet is arranged to generate a magnetic field, the Lorentz force in the direction opposite to the Lorentz force of the barrel-type deflection magnetic field of the second deflection coil, which the pincushion type magnetic field forming the permanent magnet, affects the three electron beams, The ellipsing of the electron beam and the bias of the pair of side beams due to the barrel type deflection magnetic field of the second deflection coil can be corrected.

In addition, the deflection apparatus is generated with respect to the central axis of the deflection apparatus so as to generate a pincushion type magnetic field that compensates for deflection aberration by a deflection magnetic field forming a second deflection coil on the path of the three electron beams between the deflection apparatus and the electron lens portion of the electron barrel. When the pair of permanent magnets are arranged in the same direction as the arrangement direction of the 3 electron beams and in the direction orthogonal to the arrangement direction of the 3 electron beams with the polarity reversed in axial symmetry, they are arranged in the direction orthogonal to the arrangement direction of the 3 electron beams. In addition to the action of the pincushion type magnetic field forming the permanent magnet, the magnetic field affecting the pair of side beams by the Lorentz force opposite to the Lorentz force of the barrel-type deflection magnetic field of the second deflection coil between the pair of side beams between the magnetic poles of the adjacent permanent magnets. The pair of side beams can be corrected more effectively.

In any color water tube, when the above-mentioned permanent magnet and the magnetic field control element in which the rear leakage magnetic field of the deflection apparatus is combined are used together, the convergence of the front surface of the screen can be improved by the magnetic field control element in addition to the action of the above-mentioned permanent magnet. In addition, when the spacing between the magnetic poles of the permanent magnets arranged in the direction perpendicular to the arrangement direction of the three electron beams is smaller than the spacing between the pairs of side beams, an effective magnetic field can be formed in the electron beam passing region.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated based on an Example with reference to drawings.

Example 1

1 shows an embodiment of a self-convergence inline color water tube.

This collar water tube has an outer period 3 which is a panel 1 and a funnel 2 and faces a shadow mask 4 formed with a plurality of electron beam through holes mounted inside the panel 1. A phosphor screen 5 is formed on the inner surface of a three-color phosphor layer that emits blue, green, and red light. In the neck 6 of the funnel 2, an inline electron gun body 20 to be described later, which emits three electron beams B, G, and R in a row arranged in the same plane, is provided.

In addition, the three-electron beams (B) (G) (R) emitted from the above-described electron muzzle bodies 20 outside the boundary portion between the cone portion 8 and the neck 6 of the funnel 32 are deflected in the horizontal and vertical directions so that the phosphors A deflection device 21 for scanning the screen 5 is mounted. The deflection device 21 described above is a self-converging method in which the three electron beams (B) (G) (R) are concentrated on the phosphor screen 5 by a non-uniform magnetic field, for example, wound in a saddle shape and the separator 22. ) A pair of horizontal deflection coils 23 mounted upside down (Y-axis direction) symmetry, and a pair of vertical deflection coils 25 wound around the core 24 and mounted outside the separator 22, for example. Has The pair of horizontal deflection coils 23 of the deflecting device 21 form a pincushion type deflection magnetic field which deflects the three electron beams emitted from the above-described electron gun body 20 in the horizontal direction (X-axis direction), and a pair of vertical The deflection coil 25 forms a barrel-type deflection magnetic field that deflects three electron beams in a vertical direction (Y-axis direction) orthogonal to the arrangement direction thereof.

In addition, the pincushion type deflection magnetic field and barrel type deflection magnetic field here mean that they are pincushion type deflection magnetic field and barrel type deflection magnetic field collectively, respectively. In the collar water tube of the present example, as shown in FIG. 2, the center axis (Z axis) of the deflector 21 (generally mounted on the collar water tube) is attached to the electron barrel side end portion 27 of the deflector 21 described above. In one case, a pair of permanent magnets 28a and 28b are attached axially or vertically with respect to the tube axis.

The permanent magnets 28a and 28b are cubic oxide magnets, as shown in FIG. 3, and are formed with a gap (length) between the ends of the poles Sm = 6mm thickness Hm = 3mm width Dm = 3.5mm and the center portion of the poles. The surface magnetic flux density is about 1500 Gauss / cm 2, and the polarities are arranged in the reverse directions in the upper and lower permanent magnets 28a and 28b.

In addition, the electron barrel 20 of the color receiving tube of this example includes three independent cathodes 30 arranged in a horizontal direction as shown in FIG. 4, and first and second agents for controlling electron emission from the cathode 30. 3rd to 6th grid 33 which accelerates and concentrates the electron beam forming part which consists of 2 grids 31 and 32, and 3 electron beams (B) (G) (R) emitted from the electron beam forming part. It has an electron lens section of 36 and a convergence cup 37 is attached to the sixth grid 36.

38 is a heater for heating the cathode 30.

The first, second, and fourth grids 30, 32, 34 of the electron muzzle 20 are plate-like in an integral structure in which three electron beam through holes corresponding to three cathodes 30 are formed. The third, fifth, and sixth grids 33, 35, 36 are cylindrical electrodes having a unitary structure in which three electron beam through holes are formed. In particular, the electron beam through holes of each of the grids 33 to 36 constituting the electron lens portion have the arrangement of the pair of permanent magnets described above, as shown for the fifth and sixth grids 35 and 36 in FIG. Correspondingly, not only the center beam through holes 39a and 39b but also a pair of side beam through holes 40a, 40b, 40c and 40d are coaxial, so that the distance between the side beam through holes, i. The arrangement direction spacing Sg of the pair of side beams is about 6.6 mm with respect to the permanent magnet Sm = 6 mm of the size mentioned above.

In addition, around the side beam passage hole of the bottom of the convergence cup 39, a magnetic field control element for correcting coma aberration, which is a magnetic body 41a (41b) coupled with the rear leakage magnetic field of the deflection apparatus, is provided.

However, as described above, when a pair of permanent magnets 28a and 28b stimulating both ends are disposed above and below the electron barrel side end 27 of the deflecting device 21, the polarity is reversed. .

(1) The permanent magnets 28a, 28b, whose polarity is smaller than the pair of side beam arrangements and whose polarities are arranged in the reverse direction, correspond to the barrel-type vertical deflection magnetic field 42 of the vertical deflection coil as shown in FIG. Thus, a strong pincushion type magnetic field 43 is formed in the passage region of the three electron beams (B) (G) (R).

Therefore, in contrast to the Lorentz force received by the spot barrel-type vertical deflection magnetic field 42 of the three-electron beams (B) (G) (R) reaching the phosphor screen through the pincushion-type magnetic field 43, the vertical direction is the long axis. And a phenomenon in which an ellipsoid having a long axis in the horizontal direction of the beam spot based on the barrel-type vertical deflection magnetic field 42 is biased and a spot of a pair of side beams is biased.

The effect of correcting the beam spot by the pair of permanent magnets 28a and 28b is a current synchronized with the deflection current flowing in the vertical deflection coil toward the electron gun body of the deflection apparatus as shown in Japanese Laid-Open Publication No. 57-45748. Compared with the addition of the auxiliary coils for flowing, the compensator is simple and compact, and can be configured at low cost and the mass productivity is good.

In addition, in the case of the auxiliary coil, the magnetic field is changed by the deflection current flowing through the vertical deflection coil. Therefore, if the auxiliary coil is properly corrected for the beam spot shape near the vertical axis end of the screen, the magnetic field becomes too weak in the middle of the vertical axis. The beam spot shape cannot be corrected.

Conversely, attempting to properly correct the beam spot shape in the middle of the vertical axis requires a fairly strong magnetic field.

In this case, the beam spot shape near the vertical axis end is overcompensated for a strong magnetic field, and not only deteriorates, but also adversely affects convergence characteristics.

As a result, it is very difficult to properly correct the beam spot of the entire screen in the auxiliary coil, but since the pair of permanent magnets 28a and 28b normally generate magnetic fields, if the beam spot near the vertical axis end of the screen is optimally corrected, At the same time, the beam spot of the middle portion can be sufficiently corrected, and the shape of the beam spot of the entire screen can be made good.

② This color water tube can be corrected according to the deflection current of the deflecting device by the magnetic field correction element installed at the bottom of the convergence cup 37, and it is possible to correct the convergence of the periphery of the screen, that is, coma aberration, to provide good convergence throughout the entire screen. You can get it. Especially in the large color water tube with large screen size, the constant focus and convergence is required from the center of the screen to the periphery, which is more disadvantageous in the auxiliary coil, which is difficult to adjust the center of the screen and the periphery, but the permanent magnets 28a (28b) of the present example. ) Can be advantageously done.

③ The strong pincushion type magnetic field 43 by the pair of permanent magnets 28a and 28b causes them to be center beams in the pair of side beams B and R as shown by arrows 44 and 45 in FIG. Lorentz moves in the (G) direction.

Therefore, by appropriately setting the intensity of magnetization of the permanent magnets 28a and 28b, it is possible to give a static concentration function of concentrating the three electron beams B, G, and R to a point on the center of the phosphor screen.

The static concentration of the three electron beams (B) (G) (R) is one of the grids 35a for the two opposing grids 35a and 36a constituting the main lens as shown in FIG. 8 in the conventional electron gun barrel. An electrostatic lens formed between the opposing grids 35a and 36a by deviating the side beam through hole of the other grid 36a to the outside, i.e., away from the center beam through hole, with respect to the side beam through hole of 46 is asymmetrical, or as shown in FIG. 9, the electrostatic lens 46 formed between two opposing grids 34b and 35b is inclined with respect to the side beams B and R. The electron beams (B) (G) and (R) are concentrated at one point on the phosphor screen.

Therefore, such a conventional positive convergence method requires two kinds of electrodes having different shapes. However, when the pair of permanent magnets 28a and 28b are provided as described above, the electron beam concentration phenomenon of the permanent magnets 28a and 28b does not necessarily give a positive convergence function to the electron gun barrel. As shown in FIG. 4 and FIG. 5, the three beams B, G and R are formed on the phosphor screen by forming the side beam through holes of each of the grids 33 to 36 constituting the main lens on the same axis. The structure which does not concentrate on, for example, 3 electron beams (B) (G) (R) can be set as the structure which discharges in parallel.

Such an electron barrel can produce a grid at a lower cost than the conventional electron barrel which asymmetrically or inclined the electrostatic lens, and can increase the assembly degree of the electron barrel. In addition, the pair of permanent magnets 28a and 28b of the present embodiment are not limited to the three electron beams emitted from the electron barrel in parallel with each other by appropriately selecting the size, arrangement, and strength of the pair of permanent magnets 28a and 28b. The same may apply.

④ The strong pincushion type magnetic field 43 formed by the pair of permanent magnets 28a and 28b has a long axis perpendicular to the spot of the electron beam in the center of the screen as shown by arrows 47 and 48 in FIG. The Lorentz force exerts an elliptical distortion.

In the conventional electron gun barrel, the beam spot at the periphery of the screen is distorted into a horizontal ellipse having a long axis in the horizontal direction by the barrel-type vertical deflection magnetic field of the deflecting device. It was to become an oval. This is usually done by constructing a non-rotational symmetrical lens with different focusing strengths in the vertical and horizontal directions, but the structure of the non-rotational symmetrical lens is higher than that of a conventional electrode, and the processing accuracy is high. The cost of the electron gun barrel is increased.

However, the beam spot shape at the center of the screen by the permanent magnets 28a and 28b means that it itself has a non-rotating symmetric lens function, and it is not necessary to give the electron barrel to the non-rotating symmetric lens function as conventionally and thus the electron gun The electrode of the whole sphere can be comprised by the simple electrode which comprises a rotationally asymmetrical thing, can lower the electron muzzle body, and can raise reliability.

⑤ The auxiliary coil is difficult to arbitrarily change shape, size, etc. so as to form a required magnetic field due to its structure, and it is easy to enlarge the whole.

However, the permanent magnets 28a and 28b can easily change magnetic pole spacing, magnetization strength, shape, and the like, and can form the whole in a small size.

In addition, the arrangement position is also greater in freedom compared to the auxiliary coil. For example, the arrangement position can be arranged between the electron muzzle side end portion of the deflecting device and the core. In fact, the arrangement position is very good, and a very good correction effect can be obtained.

Example 2

The collar receiving tube of this example is a self-converging inline type collar receiving tube like the collar receiving tube of the first embodiment or the deflecting apparatus 21 at the electron barrel side end 27 of the deflecting apparatus 21 as shown in FIG. The pair of permanent magnets 28a, 28b, 50a and 50b are arranged vertically and horizontally so that the axis symmetry or the polarity thereof is in the reverse direction with respect to the central axis.

These permanent magnets 28a, 28b and 50a and 50b have a cubic oxide magnet similar to that of the permanent magnet of the first embodiment, or the surface magnetic flux density of the magnetic pole center portion of the permanent magnets 28a and 28b arranged up and down. The surface magnetic flux density of the magnetic pole center portion of the permanent magnets 50a and 50b disposed left and right with respect to 1500 Gauss / cm 2 is set smaller than that at 1500 Gauss / cm 2.

By the way, when a pair of permanent magnets 28a, 28b, 50a, 50b are arranged on the top, bottom, left and right sides of the electron barrel side end portion 27 of the deflecting device 21, the following effects are obtained.

That is, the pair of permanent magnets 28a and 28b arranged up and down has the same effect as in the above-described first embodiment.

As a result, the pair of permanent magnets 28a and 28b form a strong pincushion type magnetic field corresponding to the barrel type vertical deflection magnetic field of the vertical deflection coil 25, and have an electron beam with the Lorentz force received from the barrel type vertical deflection magnetic field. It has a Lorentz force that distorts the spot into an ellipse with a vertical axis as the major axis, and corrects an ellipse with the horizontal axis of the beam spot as the major axis based on the vertical deflection field and the bias of the spot of a pair of side beams. .

On the other hand, the pair of permanent magnets 50a and 50b arranged left and right form a pincushion type magnetic field 52 in the same direction as the pincushion type horizontal deflection magnetic field 51 as shown in FIG.

At the same time, since each of the permanent magnets 28a, 28b, 50a, 50b is arranged so that the polarities are reversed, as shown in FIG. 13, the pair of permanent magnets 50a, 50b are each adjacent permanent magnets 28a. The magnetic field 53 is also formed between the magnetic poles of 28b. The magnetic field 53 gives a pair of side beams (B) and (R) a Lorentz force opposite to the direction in which the spot is biased by the barrel-type vertical deflection magnetic field, and a pair of sides based on the barrel-type vertical deflection magnetic field. The bias of the spots of the beams B and R is more effectively corrected.

In order to effectively effect the action of the magnetic field 53 on the side beams B and R, the spacing Sm between the magnetic poles of the upper and lower pairs of permanent magnets 28a and 28b is set in the arrangement direction of the pair of side beams ( It is better to make smaller than Sg).

However, as described above, the pincushion type magnetic field 43 of the upper and lower permanent magnets 28a and 28b acts to bring the pair of side beams B and R to the center beam G, but the left and right permanent magnets Since the pincushion type magnetic field 52 formed by (50a) (50b) acts to move a pair of side beams (B) (R) away from the center beam (G), it is similar to the collar water tube of Example 1 mentioned above. It is difficult to combine with electron gun barrels that emit parallel beams, and it is better to combine the electron gun spheres with a pair of side beams facing the center of the phosphor screen.

In addition, coma aberration can be made into a color water tube without coma aberration by correcting the convergence of the periphery of the screen by a magnetic field control element provided in the electromagnetic barrel as in the color water tube of Example 1.

In addition, the color water pipe of the present example can easily form a required magnetic field by modifying the intervals, magnetization strengths, and shapes of magnetic poles of the permanent magnets 28a, 28b, 50a, 50b, and the whole is compact. can do.

Moreover, the arrangement position also has a large degree of freedom, and for example, it arrange | positions between the electron muzzle side side part of a deflection apparatus, and a core, and the very favorable correction effect is acquired.

Example 3

In Examples 1 and 2 described above, a pair of permanent magnets are arranged on the upper, lower, upper, lower, left, and right sides of the electron barrel side of the deflecting device, but the permanent magnet should be in the electron beam passing area on the electron barrel side with respect to the deflecting device. You may remove it and install it independently.

14 shows three independent cathodes 30 arranged in a line in the horizontal direction of the electron muzzle 20 and first and second grids 31 and 32 which control the emission of electrons from the cathode 30. A bipotential electron muzzle comprising an electron beam forming portion to be formed, and an electron lens portion consisting of third and fourth grids 33 and 34 for accelerating and focusing three electron beams emitted through the electron beam forming portion, At the same time, a magnetic field control element made of magnetic materials 41a and 41b is provided around the side beam passage hole at the bottom of the convergence cup 37 attached to the fourth grid 34 constituting the electron lens portion. A pair of permanent magnets 28a and 28b is placed on the inner side of the 37 so that the axisymmetry or the polarity thereof is reversed with respect to the central axis 55 of the electron muzzle body 20. The spacing between the magnetic poles of 28a) and 28b is smaller than the spacing of the pair of side beams passing through the electron lens section. All.

The configuration and arrangement of these permanent magnets 28a and 28b correspond to the arrangement of the permanent magnet of the first embodiment described above. FIG. 15 shows the center of the electron muzzle body 20 of the convergence cup 37 while providing a magnetic field control element to be the magnetic bodies 41a and 41b at the bottom of the convergence cup 37 for the electron muzzle body 20 having the same structure. The pair of permanent magnets 28a, 28b, 50a and 50b are arranged vertically and horizontally so that the axis symmetry or the polarity of the shaft 55 is reversed. In this case, the spacing between the magnetic poles of the permanent magnets 28a and 28b arranged up and down is smaller than the spacing between the pair of side beams passing through the electron lens portion.

The magnetic flux formed by the permanent magnets 50a and 50b disposed on the left and right sides is larger than the surface magnetic flux density of the permanent magnets 50a and 50b disposed on the left and right sides. It is configured to form a pincushion type magnetic field that is stronger than strength.

The configuration and arrangement of these permanent magnets 28a, 28b and 50a and 50b correspond to the arrangement of the permanent magnet of the second embodiment described above.

Thus, even if the permanent magnets 28a and 28b or the permanent magnets 28a and 28b and 50a and 50b are disposed in the electron muzzle body 20, the same effects as those of the above-described embodiments 1 and 2 can be obtained. I can do it with a color water pipe.

In addition, in Example 3 mentioned above, a pair of permanent magnets were arrange | positioned up, down, up, down, left, and right inside the convergence cup, but this permanent magnet can also be arrange | positioned in the grid which comprises the main lens part of an electron barrel, for example.

However, in this case, when the pincushion type magnetic field forming the permanent magnet acts on the main lens of the electron barrel, coma aberration occurs due to the side beam not passing through the center of the main lens. It is preferable to arrange at a position not falling short of.

The present invention is not limited to the electron muzzles shown in the above-described embodiments, but can also be applied to color receiving tubes having various other electron muzzles, and in particular, the case of disposing a permanent magnet in the electron muzzles.

In addition, the magnetic field control element is not limited to the coma aberration correcting element of each embodiment described above, but can be variously selected according to the size and system of the color receiving tube and the deflection device.

Position the three electron beams in a row arrangement through the same plane to the phosphor side with respect to the electron barrel side end portion of the deflection apparatus or the main lens portion of the electron barrel to form a deflection magnetic field deflecting in the direction perpendicular to the arrangement direction and the arrangement direction. When a pair of permanent magnets are arranged vertically or vertically or vertically to form a pincushion type magnetic field in the vicinity of an electrode, the permanent magnets form a pin.

By the cushion type magnetic field, the deflection aberration of the magnetic field of the deflecting device on the electron beam can be corrected and the focus characteristic can be improved in the periphery of the screen.

Claims (7)

Electron beam forming portions 30, 31 and 32 forming a three electron beam consisting of a center beam G and a pair of side beams R and B and an electron lens portion 33 focusing the three electron beams. ), (34), (35) and (36), in-line electron muzzle (20) emitting three electron beams in a row arranged through the same plane, and mainly pincushion deflecting the three electron beams in two array directions. A deflection device having a first deflection coil 23 for forming a type deflection magnetic field and a second deflection coil 25 for forming a mainly barrel-shaped deflection magnetic field which deflects the three electron beams in a direction orthogonal to the arrangement direction thereof; 21. In the color receiver having 21, the electron lens portions 33 and 34 of the deflecting device 21 and the electron muzzle 20 correspond to a deflection magnetic field formed by the second deflection coil 25. 35) deflection aberration due to the deflection magnetic field formed by the second deflection coil 25 on the path of the three electron beams between the 36 and 36 And the strength and arrangement position of each of the magnetic fields generated so as to generate a pincushion type magnetic field that performs the static concentration of the three electron beams symmetrically with respect to a central axis, having at least one pair of permanent magnets set to each other. Collar award-winning hall. Electron beam forming portions 30, 31 and 32 forming a three-beam beam consisting of a center beam G and a pair of side beams R and B, and an electron lens section 33 focusing the three electron beams. ) An inline electron muzzle 20 having 34, 35, 36 and emitting three electron beams in a row arranged through the same plane, and mainly for deflecting the aforementioned three electron beams in the arrangement direction. Deflection device 21 having a first deflection coil 23 for forming a pincushion-type deflection magnetic field and a second deflection coil 25 for forming a barrel-type deflection magnetic field which deflects three electron beams in a direction orthogonal to the arrangement direction thereof. In the color receiving tube having the magneto-optical tube, the magnetic lens units 33, 34, 35, 36 of the deflecting device 21 and the electron muzzle 20 correspond to the deflection magnetic field formed by the second deflection coil 25. The polarity is reversed in the axisymmetric direction with respect to the central axis of the deflecting device 21 on the path of the three electron beam between the Each pair is arranged in a direction orthogonal to the arrangement direction of the axial direction and the three electron beam, and each generated magnetic field is generated so as to generate a pincushion type magnetic field that compensates for deflection aberration caused by the deflection magnetic field formed by the second deflection coil 25. And at least one pair of permanent magnets whose strength and arrangement position are set to each other. The color water pipe according to claim 1 or 2, further comprising a coma aberration correcting device that is a magnetic material that engages with the rear exposed magnetic field of the deflection device. The number of colors according to claim 1 or 2, wherein the spacing between the magnetic poles of the pair of permanent magnets arranged in a direction orthogonal to the arrangement direction of the three electron beams is smaller than the spacing of the pair of side beams. relation. A three-electron beam emitted from the in-line electron muzzle is deflected on a phosphor screen, mounted on a color receiving tube for reproducing an image, and also forms a mainly pincushion-type deflection magnetic field that deflects the three electron beam in its array direction. In the deflecting device 21 having a first deflection coil 23 and a second deflection coil 25 which forms a mainly barrel-shaped deflection magnetic field which deflects the three electron beams in a direction orthogonal to the arrangement direction thereof. According to the deflection magnetic field formed by the second deflection coil 25, the deflection device 21 and the electron lens portions 33, 34, 35, 36 of the electron gun body 20 are in the path of the three electron beams. Compensated by the deflection aberration due to the deflection magnetic field formed by the second deflection coil 25, and to generate a pincushion type magnetic field that performs static concentration of the three electron beams in axisymmetric with respect to a central axis. Magnetic field strength and placement And at least one pair of permanent magnets whose positions are mutually set. A first deflection coil that is deflected and scanned on the phosphor screen of the three electron beams emitted from the inline electron muzzle, and is mounted on a color receiving tube for reproducing an image to form a pincushion deflection magnetic field that deflects the three electron beams in an arrangement direction 23. A deflection device 21 having a second deflection coil 25 that forms a barrel-shaped deflection magnetic field that deflects the three electron beams in a direction orthogonal to the arrangement direction thereof, wherein the second deflection coil 25 is described above. Corresponding to the deflection magnetic field formed by the deflection device 21 and the deflection device 21 on the path of the three-electron beam between the deflection device 21 and the electron lens sections 33, 34, 35, and 36 of the electron gun body 20. A pair of polarizations are arranged in the same direction as the arrangement direction of the three electron beams and in the direction orthogonal to the arrangement direction of the three electron beams, with the polarity reversed in the axial symmetry with respect to the central axis of the center axis. Compensation for deflection aberration due to deflection magnetic field The deflecting device, characterized in that each of the intensity and arrangement of the magnetic field generated position having a plurality of permanent magnets from each other is set to generate a pincushion type magnetic field. 7. The deflection apparatus according to claim 5 or 6, wherein the spacing between the magnetic poles of the pair of permanent magnets arranged in the direction orthogonal to the arrangement direction of the three electron beams is smaller than the spacing of the pair of side beams. .

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