JPH062540U - Electron beam adjuster - Google Patents

Abstract

(57) [Abstract] [Purpose] An electron beam adjusting device in which magnets of the same pole can be easily selected and combined at the time of assembling work of the electron beam adjusting device, and the assembly inspection in the assembled state is also easy. The present invention also provides an electron beam adjusting device that can use a common mold for forming each pole magnet and does not require marking application. An electron beam adjusting device in which the surface color of each pole magnet is made different by changing the color of the resin magnet raw material itself.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electron beam adjusting device mounted on a neck portion of a color picture tube and a CRT display picture tube.

[0002]

[Prior art]

 Conventionally, an in-line type in which an electron gun is arranged in the same plane is often used in a color CRT. In this type of color CRT, three electron beams emitted from an inline integrated electron gun sealed at the neck of the cathode ray tube are concentrated at one point in the center of the fluorescent surface coated on the front surface of the cathode ray tube. In order to make the electron beam collide with the entire surface of the fluorescent surface, the deflection yoke deflects the electron beam so that the three electron beams collide with the corresponding phosphor pixels. However, in reality, the three electron beams are not concentrated at one point on the fluorescent screen due to variations in the manufacturing of the electron gun and the deviation between the electron gun and the tube axis, and the phosphor image that each electron beam corresponds to. They may collide with each other without being separated from each other, resulting in deterioration of convergence characteristics and purity characteristics. In order to correct these variations, as shown in FIG. 5, a so-called electronic device is formed by arranging a pair of two-pole magnets P for purity adjustment, four-pole magnets C4 for convergence adjustment, and six-pole magnets C6 for convergence adjustment. The beam adjusting device a is attached to the cathode-ray tube neck portion b to correct the deviation amount.

Usually, the above magnets are magnetized to have two poles, four poles, and six poles in a ring state, and two magnets are superposed so that the magnetic poles come in opposite directions, and the magnets are attached to the outer circumference of the neck portion b. I am wearing it. The adjustment of each pole magnet is performed by the following procedure. The adjustment of the two-pole magnet is called so-called purity adjustment. The procedure is to adjust the opening angle while the magnetic poles of the two ring bodies facing each other are completely overlapped, and the opening angle is adjusted. By rotating both magnets integrally while holding them constant, each electron beam is caused to accurately hit a predetermined fluorescent substance dot to cause the fluorescent substance dot to emit light. The quadrupole magnet has a function that, by rotating it, it is possible to give the same amount of change in opposite directions to those on both sides without affecting the central one of the three electron beams. This allows the electron beams on both sides to overlap at the center of the fluorescent surface. Furthermore, the 6-pole magnet can also give the same amount of change to both sides without affecting the central electron beam, thereby superimposing the electron beams on both sides at the center of the fluorescent surface. .

Further, in a display CRT or a landscape TV, there is a phenomenon called beam rotation in which both side beams are separated at both ends in the horizontal direction of the screen, and in order to correct the phenomenon, as shown in FIG. In addition to the pole magnet C4, a second pair of 4-pole magnets B (beam rotation correction 4-pole magnets B) is newly provided.

As described above, the electron beam adjusting device is provided with ring-shaped magnets having different numbers of magnetic poles and different functions. However, since each ring-shaped magnet is used as a set of two magnets, magnets having the same poles are used. It is essential to combine them. Therefore, in the assembly work of the electron beam adjustment device, it is important to select magnets of the same pole without error, and to assemble them by selecting them quickly, and after the assembly, whether or not magnet bodies of the same pole are assembled together. It is also important to inspect.

Conventionally, in order to meet such a demand, the length of the knob portion d is set as shown in the assembly drawings of FIGS. 5 and 6 and the component drawings of the pole magnets of FIGS. 7 to 10. The shape of each pole magnet is changed by changing it for each pole magnet or by marking the knob portion d with a mark e indicating the number of poles. Furthermore, the assembly drawing of FIG. 11 and each pole magnet body of FIGS. As shown in the part drawing, the shape of each pole magnet is not changed and different paint is applied to the knob part d. For example, the purity adjusting 2-pole magnet P has a yellow marking coating section YM and a beam rotation correcting 4-pole. The white marking application part HM is for B, the green marking application part GM is for the convergence adjustment 4-pole magnet C4, and the blue marking is for the convergence adjustment 6-pole magnet C6. This is dealt with by forming the coating part BM.

[0007]

[Problems to be solved by the device]

 However, in the method of changing the shape for each pole magnet, a molding die is required for each pole magnet and there is a problem that the investment amount increases. In addition, although the shape is changed, this change in shape is simply different only in the length of the knob portion and the marking, and such a change in shape is not enough to completely eliminate a mistake in assembly during assembly work. In addition, it was found that it is not enough to identify the shape change in the assembled state, and the assembly inspection is not easy.

In addition, the method of marking differently colored knob portions without changing the shape of each pole magnet not only increases the amount of work, but also increases the amount of work, as shown in FIG. Bleeding m may enter the gap between adjacent magnets. As a result, the surface characteristics of the magnets change and appear as a change in the magnet's rotational torque, and each pole magnet is adjusted by driving the motor. It had been a cause of complaints when running.

The present invention has been made in view of the current situation, and it is possible to easily select and combine magnets of the same polarity during the assembling work of the electron beam adjusting apparatus, and to assemble them in the assembled state. The purpose of the present invention is to provide an electron beam adjustment device that can be easily inspected. In addition, an electron beam adjustment device that can use a common mold for each pole magnet and does not require marking application It will be provided.

[0010]

[Means for Solving the Problems]

 As a result of intensive studies, the present invention has conceived that, in order to solve the above-mentioned problems, the color of the resin magnet raw material itself should be changed and each pole magnet should be molded using this different color resin magnet raw material.

The first invention made based on such an idea is that the neck portion of the cathode ray tube has two poles for purity adjustment, four poles for convergence adjustment, six poles for convergence adjustment, and a beam made of a raw material of a resin magnet. In an electron beam adjustment device that is configured by mounting a pair of rotation-correction 4-pole ring-shaped magnets, by changing the color of the resin magnet raw material itself, a purity adjustment 2-pole magnet and a convergence adjustment 4-pole magnet are obtained. The feature is that the surface color of each of the 6 poles for convergence adjustment and the 4 poles for beam rotation correction is changed.

Since the gist of the present invention is to make the surface color of each pole magnet body different by changing the color of the resin magnet raw material itself, the present invention is an electronic type that does not have four poles for beam rotation correction. It can also be applied to a beam adjusting device. The second invention completed with such a purpose is an electron beam adjusting apparatus configured by mounting a pair of two pole magnets for purity adjustment, four poles for convergence adjustment and six pole magnets for convergence adjustment, respectively By changing the color of the magnet material itself, the surface color of each of the two pole magnets for purity adjustment, the four poles for convergence adjustment, and the six pole magnet for convergence adjustment is changed.

Further, instead of making all the pole magnets different colors, the convergence adjustment 4-pole magnet and the convergence adjustment 6-pole magnet are made the same color, and these two magnets are distinguished from each other by changing the shape of the knob portion or It may be performed by a conventionally known means such as marking. A third invention made based on such an idea is a ring shape having two poles for purity adjustment, four poles for convergence adjustment and six poles for convergence adjustment, which are made of resin magnet raw material, in the neck portion of the brown tube. In an electron beam adjustment device that is configured by mounting a pair of magnets each, by changing the color of the resin magnet raw material itself, the surface color of the 2-pole magnet for purity adjustment and the convergence adjustment that is the same color It is characterized by changing the surface color of the 4-pole magnet and the 6-pole magnet for convergence adjustment.

Various methods can be considered for coloring the resin magnet raw material itself. For example, the resin magnet raw material itself can be colored by dispersing an inorganic pigment that also serves as an inorganic filler, or the individual magnets of each pole can be colored. It is adopted that the surface color of each pole magnet is made different by selecting the magnetic powder suitable for the function and reflecting the color of the magnetic powder itself on the color of the resin magnet raw material.

By the way, when observing in detail the 2-pole magnet for purity adjustment, 4-pole, 6-pole magnet for convergence adjustment, and 4-pole magnet for beam rotation correction, the amount of beam movement by the 2-pole magnet is 4, 6-pole for convergence adjustment. It can be seen that there are several times the number of magnets and beam rotation correction 4-pole magnets. This is because the two-pole magnet is used to match each color beam from the electron gun with the tube axis of the picture tube. In addition, the beam movement amount is 9 mm in radius considering the variations in the production of the picture tube and the influence of geomagnetism. The 4 and 6 pole magnets for adjusting the convergence are used for the purpose of concentrating each color beam in the central part of the picture tube, whereas the concentration of each color beam is mostly determined by the design of the electron gun itself. Therefore, the beam moving amount may be small, and the beam moving amount is set to be around 3 mm in radius. Since the amount of beam movement is proportional to the magnetized amount of the magnet, the magnetized amount of the 4- and 6-pole magnets for convergence adjustment and the 4-pole magnet for beam rotation correction is larger than that of the 2-pole magnet. It can be seen that not only a low value is sufficient, but also a low magnetic force is preferable. In consideration of such circumstances, the conventional ferrite bond magnet will be used for the 2-pole magnet that requires high magnetic force, and other 4-pole and 6-pole magnets for convergence adjustment and 4-pole for beam rotation correction will be used. It is judged preferable to use a resin magnet raw material having a low magnetic powder content. In addition, the purity adjustment 2-pole magnet uses the color of the ferrite bond magnet itself as it is, and the surface color is made brown, and other 4 and 6-pole magnets for convergence adjustment and 4-pole magnet for beam rotation correction are used. It is considered to change the surface color of the magnet body by using a resin magnet raw material in which an inexpensive inorganic filler that also serves as a coloring pigment is dispersed together with magnetic powder. In this case, the 4 and 6 pole magnets for convergence adjustment and the 4 pole magnets for beam rotation correction, which are compounded with an inorganic filler, have a low magnetic powder content, so that it is possible to reduce variations in magnetization during low magnetic force magnetization. it can.

Instead of changing the surface color of the magnet body by blending an inorganic filler that also serves as a coloring pigment, a specific one is selected as the magnetic powder of each pole magnet, and the unique color of the magnetic powder itself is selected. The color of the resin magnet raw material can be changed by using it as it is. For example, since a strong magnetic force is required for the purity adjustment 2-pole magnet, a ferrite bond magnet is used to make it brown, and a convergence adjustment 4-pole magnet is made of an alnico metal bond magnet with little thermal demagnetization. It can be used to make it silver, and the 6-pole magnet for convergence adjustment to make it red by using a magnetic powder type bond magnet in which ferrite and iron oxide are mixed.

Further, it is not necessary to make all the respective pole magnets different in color. For example, the 4-pole magnet for convergence adjustment and the 6-pole magnet for convergence adjustment are not the same color, and the surface color of the 2-pole magnet for purity adjustment is as described above. It may be different from the 4 and 6 pole magnets for convergence adjustment. In this case, as a means for distinguishing between the 4-pole magnet for convergence adjustment and the 6-pole magnet for convergence adjustment, conventionally known methods such as changing the length of the knob portion, marking the number of poles, and further applying a marking are known. It is also possible to appropriately use the above method in combination.

[0018]

[Action]

 When assembling such an electron beam adjusting device, the difference in each pole magnet is recognized according to the surface color, and magnet bodies of the same color are selected and combined. For each pole magnet body, the resin magnet raw material itself is colored, and the entire surface of the molded ring-shaped magnet body is colored, so it is easy to select the corresponding magnet body, and if a different color magnet body is used, If they are combined, the error can be found immediately, and the inspection after assembly is easy. The electronic beam adjusting device thus assembled adjusts the purity, convergence and the like by operating the ring-shaped magnet of each magnetic pole as in the conventional case.

[0019]

【Example】

 Next, the details of the present invention will be described based on the illustrated embodiment. FIG. 1 shows an embodiment of the first invention. The electron beam adjusting device a includes a pair of beam rotation correction four-pole magnets B and B, a pair of purity adjustment two-pole magnets P and P, a pair of convergence adjustment six-pole magnets C6 and C6, and a pair of them on a cylindrical holder. The four pole magnets C4 and C4 for convergence adjustment are assembled by inserting a ring-shaped spacer therebetween. It goes without saying that the example shown in the figure is an example of the combination order of the pole magnets, and the combination permutation of the pole magnets is not limited to that shown in the figure. FIG. 2 shows an embodiment of the second invention, showing an electron beam adjusting device which does not have a quadrupole magnet for beam rotation correction.

The present invention is characterized in that the surface color of each pole magnet is changed by changing the color of the resin magnet raw material itself in the electron beam adjusting apparatus having such a configuration. The beam rotation correction 4-pole magnet B, the purity adjustment 2-pole magnet P, the convergence adjustment 6-pole magnet C6, and the convergence adjustment 4-pole magnet C4 are all formed in the same shape using a common mold, and each pole is formed. The magnets are colored differently. Coloring may be performed so long as each pole magnet body can be easily distinguished, and the specific color is not particularly limited.

The resin magnet raw material itself may be colored by dispersing an inorganic pigment for the purpose of coloring only, but it is more preferable to disperse the inorganic pigment also serving as an inorganic filler. As the inorganic pigment, one having good dispersibility and excellent heat resistance is used. For example, in the case of 4-pole magnets for adjusting convergence, 6-pole magnets, 4-pole magnets for correcting beam rotation, etc., iron oxide, Al and ₂ 0 _3, but the SiO _2, the inorganic filler such as CaCO ₃ be appropriate amount has been conventionally performed, if colored by utilizing a unique color each pole magnet body the inorganic filler's It is preferable because no separate pigment is required.

FIG. 3 shows an embodiment of the third invention. In the above-described embodiment, the surface colors of the respective pole magnets are all different colors, but in the third invention, both the 4-pole magnet C4 for convergence adjustment and the 6-pole magnet C6 for convergence adjustment are not the same color, and the purity is set to these. The adjusting two-pole magnet P has a different color. In the example shown in the figure, the length of the knob portion d is changed in order to distinguish between the four-pole magnet C4 for convergence adjustment and the six-pole magnet C6 for convergence adjustment, which have the same color, but instead of changing the length of the knob portion d A conventionally known method such as marking with the number of poles or marking application can be appropriately used in combination. In this case, multiple molding dies are required and the problems associated with marking application cannot be solved, but other measures are taken to facilitate the selection of magnets during assembly work and the assembly inspection in the assembled state. Similar to the example.

As described above, for coloring each pole magnet, a method of simply adding a coloring agent and a method of serving as both an inorganic filler and a coloring agent used for the purpose of achieving a low magnetic powder content can be adopted. It is also possible to make the surface color of each pole magnet different by selecting a specific magnetic powder in consideration of the magnetic characteristics required for the pole magnet and reflecting the unique color of these magnetic powders in the color of the resin magnet raw material. it can. For example, a ferrite-based bond magnet may be used for the purity adjusting two-pole magnet P that requires a strong magnetic force so that the surface color is brown, while the magnetic force is weaker than that of the purity adjusting two-pole magnet P. It is possible to use a magnetic powder-based bond magnet in which ferrite and iron oxide are mixed for both the preferred convergence adjusting 4-pole magnet C4 and the convergence adjusting 6-pole magnet C6 to make them red.

FIG. 4 shows a further preferred embodiment, in which each pole magnet is molded using the same mold, and a ferrite-based bond magnet is used as the purity adjusting two-pole magnet P as in the above embodiment. The surface color is brown and the 6 pole magnet for convergence adjustment C6 uses a magnetic powder type bond magnet that is a mixture of ferrite and iron oxide to make it red, while the 4 pole magnet for convergence adjustment has less thermal demagnetization. This is the case where the surface color is changed to silver by using the metal color of the alnico metal using an alnico metal-based bond magnet. In this embodiment, in addition to the basic effect that each pole magnet body can be distinguished by its surface color, the heat demagnetization of the 4-pole magnet for convergence adjustment can be reduced, so an electron beam suitable for a high-definition display with a large amount of heat generation An adjusting device can be provided, and the 6-pole magnet for convergence adjustment has a low magnetic powder content and can ensure a stable magnetized state.

[0025]

[Effect of device]

 In the electron beam adjusting device of the present invention, the entire surface of each pole magnet body is colored by changing the color of the resin magnet raw material itself, so it is extremely easy to select the corresponding magnet body during assembly work. If there is a magnet body with a different color, the error can be found immediately, so the inspection after assembly is simple. Further, since the present invention distinguishes each pole magnet body by coloring the entire surface of each pole magnet body, it is not necessary to change the outer shape of each pole magnet body as in the conventional case. The same mold can be used to mold each pole magnet body. Further, since the color of the resin magnet raw material itself is changed, it is not necessary to apply marking.

When a method of dispersing an inorganic pigment that also serves as an inorganic filler is adopted as a method of coloring the resin magnet raw material itself, each pole magnet can be made to have a different color, and a convergence adjustment 4-pole or 6-pole magnet can be obtained. Can be made to have a low magnetic powder content, and a stable magnetized state can be realized even in the case of magnetizing with a low magnetic force.

In addition, when magnetic powder that matches the function of each pole magnet is selected and the color of the magnetic powder itself is reflected in the color of the resin magnet raw material to make the surface color of each pole magnet different, In addition to the basic effect that each pole magnet can be easily distinguished, the magnetic characteristics of each pole can also be in a favorable state. For example, by using an alnico metal-based bond magnet for a four pole magnet for convergence adjustment, When the surface color is silver due to the metallic color of the aluminum alloy, the thermal demagnetization of the four-pole magnet for convergence adjustment can be reduced, so an electron beam adjustment device suitable for high-definition displays with a large amount of heat generation can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the first invention.

FIG. 2 is an explanatory view showing an embodiment of the second invention.

FIG. 3 is an explanatory view showing an embodiment of the third invention.

FIG. 4 is an explanatory view showing another embodiment of the present invention.

FIG. 5 is an explanatory view showing a state in which a conventional electron beam adjusting device is attached to a neck portion of a cathode ray tube.

FIG. 6 is an explanatory view showing a state in which a conventional electron beam adjusting device having a quadrupole magnet for beam rotation correction is attached to a neck portion of a cathode ray tube.

FIG. 7 is a front view showing a conventional purity adjusting two-pole magnet.

FIG. 8 is a front view showing a conventional 4-pole magnet for beam rotation correction.

FIG. 9 is a front view showing a conventional 4-pole magnet for convergence adjustment.

FIG. 10 is a front view showing a conventional 6-pole magnet for convergence adjustment.

FIG. 11 is an explanatory view showing a conventional electron beam adjustment device in which the knob portion is marked and painted.

FIG. 12 is a front view showing a conventional two-pole magnet for purity adjustment with marking coating on the knob portion.

FIG. 13 is a front view showing a conventional 4-pole magnet for beam rotation correction, which is marking-painted on the knob portion.

FIG. 14 is a front view showing a conventional four-pole convergence adjusting magnet with marking coating on the knob portion.

FIG. 15 is a front view showing a conventional 6-pole convergence adjusting magnet with marking coating on the knob portion.

[Explanation of symbols]

 a Electron beam adjustment device b CRT neck portion B Beam rotation correction 4-pole magnet P Purity adjustment 2-pole magnet C4 Convergence adjustment 4-pole magnet C6 Convergence adjustment 6-pole magnet HM White marking application BM Yellow marking application BM Blue marking application GM Green marking application d Knob part e Engraved m Marking bleed

Claims (5)

[Scope of utility model registration request] 1. A ring magnet having two poles for adjusting the purity, four poles for adjusting the convergence, six poles for adjusting the convergence and four poles for correcting the beam rotation, each of which is made of a resin magnet raw material, is provided at the neck portion of the cathode ray tube. In the electron beam adjusting device configured to be mounted, by changing the color of the resin magnet raw material itself, the two pole magnets for purity adjustment, four poles for convergence adjustment, six poles for convergence adjustment and four pole magnets for beam rotation correction are provided. An electron beam adjustment device characterized by changing the surface color of each. 2. An electron constituted by mounting a pair of ring magnets each of which has two poles for purity adjustment, four poles for convergence adjustment and six poles for convergence adjustment, each of which is made of a resin magnet raw material, is attached to the neck portion of the cathode ray tube. In the beam adjusting device, by changing the color of the resin magnet raw material itself, a 2-pole magnet for purity adjustment, a 4-pole for convergence adjustment, and a 6-pole for convergence adjustment
An electron beam adjusting device characterized by changing the surface color of each of the polar magnets. 3. An electron configured by mounting a pair of ring-shaped magnets each of which has two poles for purity adjustment, four poles for convergence adjustment and six poles for convergence adjustment, each of which is made of a resin magnet raw material, on the neck portion of the cathode ray tube. In the beam adjustment device, by changing the color of the resin magnet raw material itself, the surface color of the two-pole magnet for purity adjustment and the surface color of the four-pole magnet for convergence adjustment and the six-pole magnet for convergence adjustment that have the same color are changed. An electron beam adjusting device characterized in that 4. The electron beam adjusting apparatus according to claim 1, wherein the resin magnet raw material itself is colored by dispersing an inorganic filler also serving as a coloring pigment in the resin magnet raw material. 5. The two-pole magnet for purity adjustment comprises:
The surface color is brown with a ferrite bond magnet, and the surface color is silver with an alnico metal bond magnet for the convergence adjustment 4-pole magnet.
The electron beam adjusting apparatus according to claim 1 or 2, wherein a magnetic powder type bond magnet in which ferrite and iron oxide are mixed is used for the convergence adjusting 6-pole magnet, and the surface color is red.