WO2002027750A1

WO2002027750A1 - Electron gun and method for manufacturing electrode of electron gun

Info

Publication number: WO2002027750A1
Application number: PCT/JP2001/002817
Authority: WO
Inventors: Yasunobu Amano; Masahiko Mizuki; Koichi Tahara; Noritaka Hamaya; Masamichi Senami
Original assignee: Sony Corporation
Priority date: 2000-09-26
Filing date: 2001-03-30
Publication date: 2002-04-04

Abstract

An electron gun of a cathode-ray tube and a method for manufacturing the electrode of an electron gun. The electrode of an electron gun is formed into a thin plate (7) where a metallic part (N) formed from one side of a metallic material (1) by shaving is continuous with the metallic material. The thin plate may be formed by coining. In such a way a thin plate part can be formed by a single machining regardless of the thickness of the metallic material. When a hole for passing an electron beam is made in the thin plate part of such an electrode, a highly precise electron gun having a micro hole for passing an electron beam can be produced while maintaining the mechanical strength of the electrode.

Description

Specification

Electron gun and method for manufacturing electron gun electrode

Technical field

The present invention relates to an electron gun for a cathode ray tube and an electrode component thereof, that is, a method for manufacturing an electron gun electrode.

Background art

In recent years, there has been an increasing demand for higher definition for a color cathode ray tube for a display, for example. Therefore, in the electron gun used for such a cathode ray tube, the diameter of the beam transmission hole of the grid electrode constituting the electron gun is reduced in order to reduce the diameter of the electron beam spot due to the demand for high definition. Increasingly smaller.

For example, looking at the electron guns in chronological order, the first grid electrode G! The diameter of the beam transmission hole of

Φ 0.43 111 111 equivalent → $ ¾ 0.32 mm equivalent 0 0.30 mm equivalent

In order. In order to drive the electron gun, which changes in this way, at the same circuit voltage as before, the power source K and the first grid electrode G! The distance d between them must be reduced, and the plate thickness of the first Darriedd electrode must inevitably be reduced. Therefore, for each of the electron guns described above, the plate thickness of the first grid electrode G1 around the beam transmission hole is determined according to the beam transmission hole diameter.

0 .06 mm → 0 .05 mm → 0 .0 5 mm

It becomes thinner in this order.

Here, the conventional first grid electrode Gi is manufactured using coining technology. Coining technology is a technology that taps a metal base plate to make it thinner.

FIG. 13 shows an example of a first shaped first grid electrode Gi using a coining technique. Here, the metal material is gradually reduced in thickness. Coining is carried out several times to move the car.

In the first grid electrode G 1, the original plate thickness T of the metal material is obtained at the coupling cross section 80 passing through the beam transmitting hole 83. The desired thickness around the plate thickness t. In order to perform the coining process up to the thickness of the sheet around the coining part Τ. 'Must be thinned by coining. In conventional multiple coining, the flesh escapes in the direction of the center hole and the flesh escapes in the radially outward direction.Therefore, the circular rib 82 is used as an escape. Must be provided. 8 1 indicates the edge of the coining part.

On the other hand, as one of the drilling methods, a cutting (punching) processing technique is known. Fig. 15 shows the concept of this shaving process. ·

As shown in Fig. 15 (5), the material base plate 70 has a diameter a (for example, 0. A shaving preparation hole (so-called lower hole) 73 is formed, and this material base plate 70 is placed on a shaving die 72 having an opening 7 4 having a diameter b. And fix it.

Next, as shown in FIG. 15B, the inner wall portion 75 of the machining preparation hole 73 of the base material plate 0 is cut at the tip of the punching die 71.

Then, as shown in Fig. 15C, the tip of the punching die 71 reaches the back 70b of the base material plate 70, and the cut-out portion of the inner wall of the material (so-called meat portion) 75切り. As a result, a through hole 76 of a final shape having a hole diameter b is formed in the base material plate 70.

In the shaving process, there is also known a technique of sequentially increasing the hole diameter while repeating the process of FIG. 15 to finally form a through hole having a desired hole diameter.

By the way, the coining technology used in the manufacture of electron gun electrodes, as described above, is a technology of hitting the base plate of a metal material to make it thinner. However, depending on the thickness of the material, it was limited to, for example, about 1/4 of the original material thickness.

Regarding this, the approach of using a thin plate as the material metal plate has been attempted by the previously reported “Structure support for the power source of the cathode ray tube electron gun” (Japanese Patent Application No. 10-304703). On the other hand, the electrode parts of the electron gun must maintain strength so that they are not deformed by pressure during assembly, etc., so use a thin plate as the material to reduce the beam transmission hole. Also had limitations. In other words, when manufacturing an electron gun electrode having a beam transmitting hole, for example, the first Darling electrode using coining processing technology, it is difficult to form a finer beam transmitting hole while maintaining strength. .

On the other hand, in the conventional coining process, since the thickness is gradually reduced, the cross-sectional shape after the coining process is changed from the raw material 86 before the coining process shown in Fig. 14 due to multiple coining processes. As can be seen from 8 9, although the machining preparation hole 8 8 for coining is formed, the edge 8 1 of the coining part is formed as a rising slope, so the measurement accuracy and measurement depend on the observation conditions at the time of dimension measurement. Poor reproducibility made it difficult to maintain and maintain the relative positional accuracy of the coining part. In FIG. 14, reference numeral 90 denotes a remaining hole of the preparation hole 88 after coining.

Further, control of the coining portion of the edge portion 8 a first meat of upsurge in 1 grid electrode G and the second grid distance between de electrode G ₂ di ₂ is unavoidably difficult .

Disclosure of the invention

An object of the present invention is to provide a method of manufacturing an electron gun electrode which can form a thin plate on which a fine electron beam transmitting hole is to be partially formed in a thick material.

The present invention includes, for example, a high-precision An object of the present invention is to provide a highly reliable electron gun suitable for a fine cathode ray tube. The electron gun of the cathode ray tube according to the present invention has a metal part cut by shaving from one surface of a metal material. An electrode formed by forming an electron beam transmitting hole in a portion of the thin plate.

In the electron gun of the cathode ray tube according to the present invention, the metal portion cut by shaving from one surface of the metal material is formed in a thin plate continuous with the metal material, and the portion of the thin plate formed by coining is further formed. And an electrode in which an electron beam transmitting hole is formed.

In the method for manufacturing an electron gun electrode according to the present invention, in the step of forming a part of a thick metal material into a thin plate, a metal part cut by sieving from one surface of the metal material is formed by a metal material. Form into a continuous thin plate.

In the method for manufacturing an electron gun electrode according to the present invention, in the step of forming a part of a thick metal material into a thin plate, a metal part cut by sieving from one surface of the metal material is formed by a metal material. Then, it is formed into a continuous thin plate, and the thin plate is thinned by coining.

In the method for manufacturing an electron gun electrode according to the present invention, the direction in which the processing reference hole is punched and the direction in which the metal material is cut are reversed with respect to the thickness direction of the metal material. Thereafter, the processes shown in the above-mentioned respective manufacturing methods are performed.

In the method for manufacturing an electron gun electrode according to the present invention, a metal material in which a periphery of a processing preparation hole is raised from another portion is formed, and a metal portion cut by shaving from one side of the metal material is formed into a metal material. It is formed into a 'continuous thin plate'. After being formed into a thin plate, a portion of the thin plate may be coined. In the above-mentioned shaving, all the raised portions may be shaved, or A part of the part may be shaved.

In the above, after forming a thin plate, an electron beam transmitting hole is formed in the thin plate portion. Alternatively, when coining is further performed, an electron beam transmitting hole is formed in the coining molded portion.

The working preparation hole formed in advance in the metal material is preferably a working reference hole having a diameter of 80% or more of the diameter of the thin plate to be subsequently formed. After forming such a processing reference hole, the processing shown in the above-described manufacturing method is performed.

The basic processing technology of the electron gun electrode of the present invention is based on the following method.

That is, the metal part is left in a connected state without being completely cut off, and the remaining cut metal part is pressed and formed into a thin plate shape as if it were a coining shape. Hereinafter, this processing technique will be referred to as shaving coin processing or, for short, shaving coin processing.

As a modification of the shaving-coin processing technology of the present invention, it is also possible to cut a metal meat portion to be cut from a metal material and then process it into a thin plate shape connected to the metal material.

According to the electron gun of the present invention, the desired electrode is formed by shaping a metal portion cut by shaving from one surface of the metal material into a thin plate continuous with the metal material, and transmitting the electron beam through the thin plate portion. Since the electrodes are formed with holes, the mechanical strength of the electrodes is maintained, and minute electron beam transmission holes are obtained. Therefore, a highly accurate electron gun with no dimensional change can be obtained.

Further, when the above thin plate is coined and an electron beam transmitting hole is formed in the coined formed thin plate portion, a finer electron beam transmitting hole can be obtained while maintaining the mechanical strength of the electrode. The accuracy of the electron gun can be further improved. According to the method for manufacturing an electron gun electrode of the present invention, the method includes a step of forming a metal portion cut by sieving from one surface of a metal material of a predetermined thickness into a thin plate continuous with the metal material. Regardless of the thickness of the metal material, a thin part with a small thickness can be formed in one process.

Therefore, it is possible to produce an electrode having high mechanical strength that is not easily deformed even by pressurization at the time of assembling the electron gun, and to assemble an electron gun having no dimensional change.

In addition, in the processing according to the present invention, the thickness of the thin plate portion can be reduced regardless of the thickness of the metal material (original plate material). improves. In addition, an electrode having smaller electron beam transmission holes and high mechanical strength can be manufactured.

During operation of the cathode ray tube, the edge of the thick plate around the thin plate forms an electric field lens, but in the present invention, this edge is formed with high relative position accuracy without swelling unlike conventional coining. it can. Therefore, not only the case where the so-called shaving coin portion is not required in characteristics but also the use as an electron lens is possible. In any case, the beam spot characteristics can be improved as compared with the conventional case.

When a thin plate is formed by shaving coin processing and then coining is performed on the thin plate, a thinner thin plate portion can be formed. Therefore, finer electron beam transmission holes can be formed.

When forming a working preparation hole having a diameter of 80% or more of the diameter of a thin plate to be subsequently formed as a working preparation hole, a thin plate having a desired thickness can be accurately formed, and a target electron can be formed. Gun electrodes can be manufactured. The direction in which the preparation hole is punched and the direction in which the metal material is cut by shaving are reversed with respect to the thickness direction of the metal material. Can be transferred to the inner surface of the remaining hole after forming the thin plate as a fracture mark. Therefore, it is possible to completely remove the fractured surface in the processing preparation hole by forming the electron beam transmitting hole thereafter, and it is possible to manufacture an electron gun electrode with high dimensional accuracy.

A protruding part is formed in advance on the surface of the metal material, a processing preparation hole is formed in this protruding part, and then, the cutting hole is processed to reduce the remaining hole diameter of the thin plate regardless of the original plate thickness of the metal material. It is possible to form a reduced shaving cone portion, and it is possible to manufacture an electron gun electrode having an extremely small electron beam transmitting hole.

Since the original thickness of the metal material can be reduced, the supporting piece formed integrally with the electron gun electrode can be made as thin as desired, and the electron gun electrode can be stably supported on the bead glass. it can.

When leaving the thick plate around the shaving coil, the shaving coil can be reinforced.

Since the electron gun according to the present invention is constructed by assembling the electron gun electrodes manufactured by the above-described method according to the present invention, a highly reliable electron gun can be provided. In particular, the present invention can be suitably applied to an electron gun for a high-definition cathode ray tube.

BRIEF DESCRIPTION OF THE FIGURES

1A to 1 () are manufacturing process diagrams (No. 1) showing a method for manufacturing an electron gun electrode according to the first embodiment of the present invention.

2D to 2E are manufacturing process diagrams (part 2) illustrating the method for manufacturing the electron gun electrode according to the first embodiment of the present invention.

3A to 3D are manufacturing process diagrams showing a method for manufacturing an electron gun electrode according to the second embodiment of the present invention. 4A to 4C are manufacturing process diagrams illustrating a method for manufacturing an electron gun electrode according to the third embodiment of the present invention.

5A and 5B are manufacturing process diagrams (part 1) illustrating a method for manufacturing an electron gun electrode according to the fourth embodiment of the present invention.

6C to 6D are manufacturing process diagrams (No. 2) illustrating the method for manufacturing the electron gun electrode according to the fourth embodiment of the present invention.

7E to 7F are manufacturing process diagrams (part 3) illustrating a method for manufacturing an electron gun electrode according to the fourth embodiment of the present invention.

8A and 8B are manufacturing process diagrams illustrating a method for manufacturing an electron gun electrode according to a fifth embodiment of the present invention.

9A and 9B are manufacturing process diagrams (part 1) illustrating a method for manufacturing an electron gun electrode according to the sixth embodiment of the present invention.

FIGS. 10C to 10E are manufacturing process diagrams (part 2) illustrating a method for manufacturing an electron gun electrode according to the sixth embodiment of the present invention.

11A and 11B are manufacturing process diagrams showing a method for manufacturing an electron gun electrode according to a seventh embodiment of the present invention.

FIGS. 12A and 12B are explanatory views showing another example of the shaving coin processing of the present invention.

Fig. 13 shows the first grid electrode G! Using conventional coining. FIG.

FIG. 14 is an explanatory diagram of ordinary coining processing.

FIGS. 15A to 15C are manufacturing process diagrams showing the concept of the shaving process.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show an embodiment of a method for manufacturing an electron gun electrode of the present invention and an electron gun electrode manufactured by the method.

In the present embodiment, as shown in FIG. That is, a metal material (for example, SUS material, other electrode material, etc.) 1 having a predetermined plate thickness is prepared, and the metal material 1 is provided with a processing hole for a shaving coin having a desired hole diameter a X (a so-called processing hole). A pilot hole 2 is formed. The hole diameter ai of the working preparation hole 2 is set to be at least 80% and less than 100% of the diameter bi of the sieving / coining die 3. The metal material 1 provided with the processing preparation hole 2 is placed and fixed on a die 4 for a single fin. As the die 4 for a shaving coin, a die having no opening or a die having an opening 5 having a hole diameter C sufficiently smaller than the hole diameter for preparation as shown in the drawing can be used.

Next, as shown in FIG. 1B, the inner wall of the working preparation hole 2 is cut by a die for the cutting and coining. That is, cut portions 6 corresponding to the difference between the processing ready pore size _a i and the diameter i of the die 3.

Next, as shown in FIG. 1C, while being cut by the mold 3, the cut portion, the so-called metal part 6, is not cut off, and the die 4 and the mold 3 are connected with the material 1. To form a thin plate 7 having a thickness ti smaller than the thickness T 1 of the metal material 1 and a diameter 13 ₁ equivalent to the diameter of the mold 3 so as to have a coining shape. In the center of the thin plate 7, a remaining hole 2 'having a diameter di is formed. Here, the remaining hole 2 must be smaller than the diameter fi (see FIG. 2E) of the final electron beam transmitting hole to be formed later.

Next, as shown in FIG. 2D, if necessary, the thin plate 7 is subjected to coining with a smaller diameter 6 to form a thinner thin plate portion 8 if necessary. .

And finally, as shown in Fig. 2E, the hole diameter f! The electron beam transmission hole 9 is formed by punching with a fine punch. Thus, the electrode 101 of the electron gun is manufactured.

In addition, a specific numerical example is shown below. The diameter 3 of 3 is, for example, 1 mm, the hole diameter a of the processing preparation hole 2 for the moving coin is, for example, 0.85 mm, the opening diameter of the die 4 for the moving coin is, for example, 0.2 mm, and the remaining hole. For example, the hole diameter of 2 ′ can be 0.37 mm, the diameter ei of coining molding can be 0.9 mm, for example, and the hole diameter f of the electron beam transmitting hole 9 can be 0.4 mm, for example.

In the shaving coin machining method, as shown in FIG. 1B, after the volume of the portion M shown by the broken line before the inner wall of the machining preparation hole 2 is shaved, it is moved to the portion. And press bottom dead center figure 1. In, the part Ν before being cut finally moves to the part N '. Here, the thickness of thin plate 7! And the hole diameter d of the remaining hole 2 '! Are calculated from the thickness of the metal material 1, the diameter of the shaving coin portion, and the hole diameter a i of the preparation hole 2, respectively. For example, it can be expressed by Equation 1.

Number 1

t! (mm) = 13.2 + 16.2Ti (mm)

+ 18.8 b! (mm)

-0.9 ai (mm)

d i (mm) = 1 4 3-1 3 6 O T t (mm)

-167 0 b i (mm) + 2 570 a L (mm) The coefficient of each term is a constant depending on the equipment conditions and environment.

In the above-mentioned shaving coin processing, in principle, the inner wall of the processing preparation hole 2 of the metal material 1 is cut off, so that the metal material 1 is thin enough to form a coining shape in one step from the state where the plate thickness T i remains large. A thin plate having a thickness t 1 can be formed. As a result,

As shown in FIG. 1C, the peripheral portion of the thin plate 7 has the thickness T of the conventional peripheral portion of the coining in FIG. 13 described above. '' It is possible to realize a thin plate 7 with a small thickness t while maintaining mechanical strength with a thicker original material plate thickness. it can.

Also, as described above, in conventional multiple coining processing, there is a so-called escape of the flesh portion in the outward direction accompanying the thinning, and therefore, the circular rib 8 2 (see FIG. 13), but in the shaving-coin processing used in the present embodiment, there is no escape of the flesh toward the outside. Therefore, there is no need to provide the circular rib 82 as in the related art, so that higher mechanical strength can be maintained.

In shaving coin machining, an edge portion is formed by one cutting process. Therefore, as shown in FIG. 1C, an edge portion of the shaving coin portion end, that is, an end of the thin plate 7 of the metal material 1 is formed. The edge portion 11 is clearly formed, positioning can be performed with high accuracy, and accuracy management is also facilitated.

The surface of the metal material 1 after the shaving coin processing has no raised portion as in the conventional coining processing, and is kept flat. In the embodiment described above, after the step of forming the thin plate by the shaving coining process of FIG. 1C, as shown in FIG. 2D, a normal coining process is performed on the thin plate 7. However, the processing in FIG. 2D may be omitted.

FIG. 3 shows another embodiment of the present invention showing this example. Fig. 3 A

Steps C to C are the same as those in the above-described steps of FIGS. 1A to 1C.

In the present embodiment, shaving coin processing is performed on the metal material 1 having a thickness to form a thin plate 7 having a desired thickness ti shown in FIG. As shown, an electron beam transmitting hole 9 having a hole diameter f 2 is formed directly in the thin plate 7 by punching to manufacture a target electron gun electrode 102.

In Fig. 2D, further normal coining is applied to A thin plate 8 having a thin plate thickness t ₂ can be formed.

Method of manufacturing an electron gun electrode of the present invention is applied to the production of the first grid electrode G t, a second glycidyl Tsu cathode electrode G _2, or other grid electrodes constituting an electron gun. According to the present invention, a plurality of electrodes are arranged so as to include the electrode grid manufactured as described above, and integrated to constitute an electron gun for a cathode ray tube.

According to the above-described embodiment, the thin plate 成形 is formed by shaving the inner wall of the preparation hole 2 of the metal material 1 while cutting the cut portion 6 without cutting off the inner wall and connecting the material 1 to the material 1. However, by using so-called shibbing coin processing, it is not necessary to reduce the thickness of the periphery of the thin plate 7, that is, the so-called shibbing coin, that is, to increase the thickness of the metal material 1 as it is. Can be. Therefore, it is possible to manufacture a grid electrode that is strong against deformation due to pressure during assembly of the electron gun, and to assemble an electron gun with no dimensional change.

According to the production method of the present invention, for example, the first grid electrode G i or the first grid electrode G! And the can and the second for producing the grid electrode G _2, first grid electrode G! Since the end face of the electron beam transmitting hole 9 is formed side are formed flat, during electron gun assembly, the distance control d _{1 2} between the first grid electrode and the second grid electrode G ₂ It is easy and reliable, and the distance d ₁₂ can be set to a desired distance with high accuracy. '

Metal material 1 thickness T! Regardless of the thickness, the thickness ti of the thin plate 7 can be made extremely thin, and a fine hole diameter f _{2 in} this thin plate 7 or further coining is formed to form an electron beam transmitting hole 9 with a small hole diameter f in the thin plate 8. it can. When a thinner sheet 8 is formed by coining, an electron beam transmitting hole 9 having a smaller hole diameter f can be formed.

80% of the diameter 13 i of the thin plate 7 to be formed beforehand on the metal material 1 By forming the preparation hole 2 having a hole diameter ai of less than 100% as described above, a thin plate 7 having a desired plate thickness tt can be formed with high accuracy.

Thus, in the cutting coin machining, according to the above equation (1), regardless of the sheet thickness T i of the metal material 1 which is the original sheet material, the sheet 7 of the sheet 7 which is the cutting coin portion is formed. Since the thickness ti can be reduced, the degree of freedom in designing an electron gun in the direction of reducing the electrode plate thickness is improved.

By the shaving coin processing, the shaving coin edge portion 11 of the electrode can be formed with high relative position accuracy. Therefore, the shaving cone portion can be used as an electronic lens as well as when it is not necessary in terms of characteristics, and in any case, the beam spot characteristics can be improved as compared with the conventional case.

Therefore, according to the present invention, an electron gun having good dimensional accuracy and a small electron beam spot diameter can be formed, and this electron gun is particularly suitable for application to a high-definition cathode ray tube.

FIG. 4 shows another embodiment of the present invention.

In the shaving coin processing, the processing preparation hole 2 shown in, for example, FIG. 1A or FIG. 3A is formed, and then the shaving coin processing in FIG. 1C or FIG. 3C is performed. Finally, the electron beam transmitting holes 9 shown in FIG. 2E or FIG. 3D are punched out by fine punching. Since the preparation hole 2 is subjected to normal punching, the inner wall of the punched metal material 1 has a smooth shear surface 2 2 and a rough fracture surface 23 with irregularities as shown in FIG. 4A. . It is difficult to control the size and shape of the fractured surface 23, and there is a possibility that the fractured surface 23 will be displaced in the subsequent shaving coin process and remain as a fractured surface mark. Figure 4 shows an improvement in this point.

In the present embodiment, as shown in FIG. 4A, when forming the shaving-coin processing preparation hole 2 in the metal material 1, the fractured surface 23 is formed on the upper surface side where the shaving-coin is performed. Indicated by arrow 2 1 The blank 1 is punched from the back side to the top side of the blank 1 to form a working preparation hole 2.

Next, as shown in FIG. 4B, the sheet is subjected to sieve coining in a direction opposite to the direction in which the processing preparation hole 2 is punched, that is, from the upper surface side to the lower surface side of the material 1 indicated by an arrow 25. Form 7 This

However, the fracture surface mark 24 moves to the inner surface of the remaining hole 2 ′ of the thin plate 7.

Next, as shown in FIG. 4C, an electron beam transmitting hole 9 is formed by punching to remove the remaining fracture surface mark 24, thereby manufacturing a target electrode 103.

It should be noted that, as shown in FIG. 2D, the thin plate 7 is subjected to a normal coining process to form a thin plate 8 after the shaving coining process shown in FIG. 4B, and then the thin plate 8 is broken. The target electrode may be manufactured by forming the electron beam transmitting hole 9 so as to remove the cross-sectional mark 24.

According to the embodiment of FIG. 4, the processing preparation hole 2 is formed by punching from the surface opposite to the surface to be subjected to the shaving coin processing, and the fracture surface 23 is left above the processing preparation hole 2. As a result, the fracture surface 23 of the preparation hole 2 and therefore the trace 24 of the fracture surface in the remaining hole 2 ′ can be completely removed by the next shaving coin process and the punching process of the electron beam transmission hole. . Therefore, an electron gun electrode with good dimensional accuracy can be manufactured.

Also, if a fracture surface remains on a different part of the electrode, distortion or the like may occur in an electric field lens formed between the electrodes when configured as an electron gun. In the present embodiment, such a distortion of the electric field lens does not occur, and a highly reliable electron gun can be configured. .

By the way, in the shaving coin machining method, as shown in Equation 1 above, the desired sheet thickness tt and the desired thickness after the shaving coin are obtained. The conditions that determine the remaining hole diameter of the preparatory hole are the base thickness of the metal material T! There is. However, if the thickness of the part where the sieving coin is to be applied and the thickness of other parts can be changed independently from the material cost and the convenience of molding the parts other than the electron beam transmission hole, the design is free. The degree will increase.

In the above-described embodiment, the original plate thickness of the metal material (the so-called material plate thickness) is selected and determined depending on the shaving coin processing. In other words, depending on the material thickness, the remaining hole diameter after the cutting coin machining d! Therefore, in order to further reduce the size of the electron beam transmission hole with a small diameter, the degree of freedom in selecting the thickness of the material becomes necessary. Next, an embodiment of a manufacturing method will be described in which the remaining hole diameter after the shaving coin processing is selected to a desired hole diameter without selecting the original plate thickness of the metal material, and the electron beam can be further reduced in diameter.

In the present embodiment, before forming the processing preparation hole of the shaving cone, a bulging portion is formed in advance on the material 'base plate, and the plate thickness of the portion forming the processing preparation hole is made smaller than the material base plate thickness. Place it thickly and give it a sieve-coining process.

FIG. 5 shows another embodiment of the present invention using this method. In this embodiment, as shown in FIG. 5A, an electrode member, that is, a metal material having a predetermined thickness T ₂ (not shown) (a so-called material base plate, for example, a SUS material, An electrode material, etc.) 31 is prepared, and a raised portion, in this example, a convex coining portion 32 is formed on one surface of the metal material 31. For this purpose, the metal material 3 1 is placed on the pre-working coining die 3 4, fixed, and processed by the pre-processing coining mold 3 3 at the portion where the preparation hole for the metal material 3 1 should be formed. forming a convex coining portion 3 2 having a pore size a ₃ larger diameter g ₃ of the preparation hole. This coining, increasing the thickness of the portion to be shell one Bingukoi down process until the desired thickness T ₃ I do. At this time, another portion, especially One to a portion near the shaving coin unit information, plate thickness T ₄ is thinner than the material source thickness T _2.

Next, as shown in FIG. 5 金属, a metal material 31 having a convex coining part 32 is placed and fixed on a die 37 for a preparation hole, and the metal material 31 is prepared by a punching die 36 for the preparation.め Hole for preparation for processing one bing coin 3

Form 8. In here, the processing preparation hole 3 8 is smaller rather Mr than the pore size of a ₃ convex shape Koiningu 3 2 diameter g ₃ a (a ₃ rather g _3), convex Koi-learning around the hole diameter a ₃ It is formed so that the thick plate portion 35 by the portion remains. The diameter a ₃ of the machining preparation hole 3 8, in the same way as described above sheet We - are set so that Bingukoi emissions strike die 4 1 0 below 0% in the first diameter b ₃ of 80% or more.

Next, the same blanking processing as described above is performed on the metal material 31. That is, as shown in FIG. 6C, the metal material 31 having the processing preparation hole 38 formed thereon is placed and fixed on the die 42 for the cutting coin. Shi We one Bingukoi down die 4 2, those openings are not, or can be used with the machining preparation opening 4 3 having a pore size of a ₃ than a sufficiently small pore size c ₃ as shown in FIG.

Next, as shown in FIG. 6D, a cutting die 41 having a diameter b ₃ is cut so as to cut the entire thick plate portion 35 around the preparation hole 38. . That is, cutting the portion 3 9 (including thick plate portion 35) corresponding to the difference between the processing quasi備孔diameter a and diameter b ₃ of the mold 4 1.

In this shaving-coin machining, after the volume of the portion P indicated by the broken line before the inner wall of the machining preparation hole 3.8 was cut, the volume moved to the portion P ', and the cut portion 39 was removed. A thin plate 45 having a thickness t is formed continuously from the metal material 31 without being cut off (see FIG. 7E).

At this time, comparing the volume of the meat portion P in FIG. 6D with the volume of the meat portion M in FIG. 1B described above, Metal content of part M Metal content of part P

Becomes

Due to the difference in the amount of metal in the moving meat portion, as shown in FIG. 7E, the hole diameter d ₃ of the remaining hole 3 8 ′ of the formed thin plate 45 becomes the diameter 0 ₁ of the remaining hole 2 of FIG. 1C. It is processed to a smaller diameter (d ₃ <d!).

In here, coining die diameter g ₃ and the machining preparation hole diameter a ₃ and shell - size of the relationship between Bingukoi down strike die diameter b ₃ of becomes a ₃ <g <b.

Finally, as shown in FIG. 7F, an electron beam transmitting hole 46 having a hole diameter f is formed in the thin plate 45 by punching with a fine punch to manufacture an electrode 104 of the electron gun.

FIG. 8 shows another embodiment. This embodiment, after the aforementioned FIG 7 E step, as shown in FIG. 8 A, further subjected to Koiningu processing of smaller diameter 6 ₄ than the diameter b relative to the thin plate 4 5, the thin plate portions and thinner Form 4 7 The hole diameter of the remaining hole 38 ^f is d ₄ .

Then, as shown in FIG. 8 B, the electron beam transmitting hole 4 8 a pore diameter f ₄ is formed by punching hitting by fine punching in a thin plate portion 4 7, to produce the electrodes 1 0 5 of electron guns.

As shown in FIGS. 5 to 7 and 8, according to the present embodiment, before forming the processing preparation hole 38, the thickness of the portion where the processing preparation hole 38 is formed is increased in advance. The convex coining part 32 is formed, and then a processing preparation hole 38 is formed so as to leave the thick plate part 35 around it. By shaving coining, the remaining hole 3 of the thin sheet 45 after processing is formed. 8 ′ can be formed even smaller, and electron gun electrodes 104 and 105 having smaller electron beam transmission holes 46 or 48 can be manufactured.

That is, in the present embodiment, the metal material 3 1 having the predetermined base plate thickness T ₂ is used regardless of the base plate thickness of the metal base material (that is, without selecting the base plate thickness). From this, a desired small-diameter shaving-coin remaining hole 38 'can be formed, and compared with the shaving-coin technology shown in FIG. 1 to FIG. 2 or FIG. Beam transmission holes 46 or 4.8 can be realized.

Further, in the present embodiment, since the electron gun electrode can be formed of the desired thickness of the metal material 31 without increasing the thickness of the base material of the metal material, the support pieces embedded in the bead glass which is the support member of the electron gun That is, pins and tabs can be provided integrally with the electron gun electrode. By the way, if the base plate thickness for the single coining process is too thick, the pins and tabs formed integrally with the base plate will also be thick, and the embedded support in the bead glass will be unstable. However, in the present embodiment, the pins and tabs can be formed thin, and the electron gun electrodes can be stably supported on the bead glass.

9 and 10 show still another embodiment of the present invention. In this example, when shaving coin processing is performed, a thick plate portion is left around the shaving coin part.

In the present embodiment, as shown in FIG. 9A, an electrode member, that is, a metal material having a predetermined plate thickness T ₂ (not shown) (a so-called raw material plate, for example, a SUS material, An electrode material 31 is prepared, and a raised portion, in this example, a convex coining portion 32 is formed on one surface of the metal material 31. For this reason, the metal material 31 is placed and fixed on the pre-working coining die 34 in the same manner as described above, and the part where the pre-working hole of the metal material 31 is to be formed by the pre-working die 33 is used. Then, a convex coining portion 32 having a diameter より大きい₅ larger than the hole diameter _a5 of the processing preparation hole is formed. By this coining, the thickness of the portion to be subjected to shaving coin processing is increased to a desired thickness T5. At this time, the thickness T 6 of the other portion, particularly the portion around the moving coin portion, becomes smaller than the original thickness T _{2 of the} material. Next, as shown in FIG. 9B, a metal material 31 having a convex coining portion 32 is placed and fixed on a die 37 for a preparation hole, and the metal material 31 is prepared by a punching die 36 for the preparation.加工 Form a processing preparation hole 38 for one bing coin. In here, the processing preparation hole 3 8, the hole diameter a 5 Mr rather smaller than convex shaped coining portion 3 2 diameter _{_{_{g 5 (a 5 <g 5}}} ), convex Koi-learning around the hole diameter a ₅ It is formed so that the thick plate portion 35 by the portion remains. Diameter a ₅ in the machining preparation hole 3 8 also, in the same way as described above shell - is set to be 1 0 less than 0% by Bingukoi emission beating mold 5 1 8 of diameter _50% or more.

Next, the metal material 31 is subjected to a sieve coining process. That is, as shown in FIG. 1 0 C, in the same manner as described above, the metal material 3 1 formed with the machining preparation hole 3 8 is placed fixed on Shiwebingukoi down die 5 2, rather large from the machining preparation hole diameter a ₅ and in sheet chromatography Bing coin striking mold 5 1 having a diameter g ₅ smaller than the diameter d ₅ of the coining portion 3 2 performs a shaving coin processing continuously, as shown in FIG. 1 0 D, the metal material 3 1 The thin plate 4 5 to be formed is formed.

The shaving coin processing is performed so that the thick plate portion 35 by the convex-shaped coining remains around the shaving coin portion. As described above, the thickness of the formed thin plate 4 5 is t ₅ ,

The hole diameter of the remaining hole 38 of ₅ was d5.

Here, the magnitude of the relationship between the diameter 13 ₅ machining preparation hole diameter a ₅ and shell one Bingukoi down strike die to the diameter _{§ 5} of coining mold becomes a ₅ rather b 5 <g 5.

Finally, as shown in FIG. 1 0 E, the electron beam transmission hole 4 6 with a pore diameter f ₅ is formed by punching by small punch sheet 4 5, to produce the electrode 1 0 6 of the electron gun.

FIG. 11 shows another embodiment. This embodiment is based on the above-mentioned figure. 1 0 After D step, as shown in FIG. 1 1 A, form a thin plate portion 4 7 subjected to coining was rather more thin small diameter 6 ₅ than further in diameter 13 ₅ with respect to the thin plate 4 5 I do. The pore size of the remaining holes becomes d _6. Next, as shown in FIG. 11B, an electron beam transmitting hole 48 having a hole diameter fs is formed in the thin plate portion 47 by punching with a fine punch to manufacture an electrode 107 of an electron gun.

Also in the present embodiment shown in FIGS. 9 to 10 and 11 ′, after forming the convex coining portion 32 in advance in the same manner as described above, processing is performed so that the thick plate portion 35 is left around. By forming the preparation hole 38 and performing the shaving coin processing, the remaining hole 38 of the processed thin plate 45 can be formed even smaller, and the smaller electron beam transmission hole 46 or Electron gun electrodes 106 and 107 having 48 can be manufactured. In addition, a support piece integrated with the electrode, that is, a pin, a tab, or the like can be formed on the electrode, and stable beading can be performed.

Further, in the present embodiment, even after the electron gun electrodes 106 and 107 are completed, the thick plate portion 35 remains around the shaving coin portion, so that the shaving coin portion is further reinforced. Thus, the mechanical strength of the electron gun electrode can be increased.

In the examples of FIGS. 5 and 9, the convex coining part 32 is formed on one surface (front surface) of the metal material.

Or it is also possible to form convex coining parts on both front and back. O

In each of the above-described embodiments, as the cutting coin processing, the metal meat portion to be cut is processed into a thin plate shape connected to the metal material before cutting from the metal material. It is also possible to cut the metal part to be cut from the metal material and then add it to a thin plate shape connected to the metal material.

That is, the shaved-coin mold is used to make the cut meat Immediately after cutting, the die cut into the cutting hole immediately from the die for the cutting coil and the cutting part cut in co-operation with the die for the cutting coil are re-formed into the metal material. To form a thin plate at the same time. Thus, for example, as shown in FIG. 12A, a flush plate 63 can be integrally formed on the back surface of the metal material 62, and as shown in FIG. The thin plate 62 in the middle of the hole can be integrally formed.

As described above, according to the method for manufacturing an electron gun electrode according to the present invention, a metal portion cut by sieving from one surface of a metal material having a predetermined thickness is formed into a thin plate continuous with the metal material. By using the shaping and coining method, it is not necessary to reduce the thickness of the periphery of the thin plate. That is, it is possible to form a thin sheet portion with a single processing while maintaining the state of a thick metal material. Therefore, it is possible to produce an electrode having high mechanical strength, which is not easily deformed even by pressurization at the time of assembling the electron gun, and to assemble an electron gun having no dimensional change.

Further, according to the present invention, the thinning portion can be formed thin irrespective of the thickness of the metal material (original plate material) by the above equation (1). ! The degree of freedom in designing electron guns in the direction of thinning is improved. Further, an electrode having finer electron beam transmission holes and having high mechanical strength can be manufactured.

During operation of the cathode ray tube, the edge of the thick plate around the thin plate forms an electric field lens, but in the present invention, this edge is formed with high relative position accuracy without swelling unlike conventional coining. it can. Therefore, it is possible not only to use a so-called shaving coin portion in terms of characteristics but also to use it as an electronic lens, and to improve the beam spot characteristics as compared with the conventional case. it can.

When a thin plate is formed by shaving coin processing and then coining-formed on the thin plate, a thinner thin plate portion can be formed. Therefore, finer electron beam transmission holes can be formed.

When forming a working preparation hole having a diameter of 80% or more of the diameter of the thin plate to be subsequently formed as a working preparation hole, a thin plate having a desired thickness can be accurately formed, and Electron gun electrodes can be manufactured.

The direction in which the preparation hole is punched and the direction in which the metal material is cut by shaving are reversed with respect to the thickness direction of the metal material. The resulting fracture surface can be transferred as a fracture surface mark to the inner surface of the remaining hole after forming the thin plate. Therefore, it is possible to completely remove the fractured surface in the processing preparation hole by forming the electron beam transmitting hole thereafter, and it is possible to manufacture an electron gun electrode with high dimensional accuracy.

A raised portion is formed on the surface of the metal material in advance, a working preparation hole is formed in this raised portion, and then a shaving coin process is performed to increase the remaining hole diameter of the thin plate regardless of the original plate thickness of the metal material. It is possible to form a reduced shaving coil part,

-An electron gun electrode having a film transmission hole can be manufactured.

When leaving the thick plate around the shaving coin, the shaving coin can be reinforced.

Since the electron gun according to the present invention is constructed by assembling the electron gun electrodes manufactured by the above-described manufacturing method according to the present invention, a highly reliable electron gun is provided. Can be In particular, the present invention can be suitably applied to an electron gun for a high-definition cathode ray tube.

Claims

The scope of the claims

1. A metal portion cut by sieving from one surface of a metal material is formed into a thin plate continuous with the metal material, and the thin plate portion has an electrode in which an electron beam transmission hole is formed. An electron gun characterized by consisting of:

2. A metal part cut by sieving from one surface of the metal material is formed into a thin sheet continuous with the metal material, and an electron beam transmission hole is formed in the thinned part of the thinned sheet. An electron gun comprising an electrode formed.

3. In the step of forming a part of the thick metal material into a thin plate, the metal part cut by shaving from one surface of the metal material is formed into a thin plate continuous with the metal material. A method for producing an electron gun electrode, comprising:

4. In the step of forming a part of the thick metal material into a thin plate, the metal part cut by shaving from one surface of the metal material is formed into a thin plate continuous with the metal material. A method for producing an electron gun electrode, which comprises coining a part.

5. The method for manufacturing an electron gun electrode according to claim 3, wherein a processing preparation hole having a diameter of 80% or more of a diameter of the thin plate to be subsequently formed is formed in the metal material. .

6. The method for manufacturing an electron gun electrode according to claim 4, wherein a processing preparation hole having a diameter of 80% or more of a diameter of the thin plate to be formed thereafter is formed in the metal material. .

7. The method is characterized in that the direction of punching a preparation hole and the direction of cutting the metal material by shaving are opposite to each other with respect to the thickness direction of the metal material. 3. The method for manufacturing an electron gun electrode according to item 3 of the scope.

8. In the thickness direction of the metal material 5. The method for manufacturing an electron gun electrode according to claim 4, wherein the metal material is processed in a direction opposite to the direction in which the metal material is cut by shaving.

9. The method according to claim 5, wherein the direction of punching a working preparation hole and the direction of cutting the metal material by shaving are opposite to each other with respect to the thickness direction of the metal material. The method for manufacturing an electron gun electrode described in the item.

10. The method according to claim 1, wherein a direction of punching a working preparation hole and a direction of cutting the metal material by sieving are opposite to each other with respect to a thickness direction of the metal material. Item 6. The method for manufacturing an electron gun electrode described in Item 6.

11. The method for manufacturing an electron gun electrode according to claim 3, wherein an electron beam transmitting hole is formed in said thin plate.

12. The method for manufacturing an electron gun electrode according to claim 4, wherein an electron beam transmitting hole is formed in the coining molded part.

13. Forming a metal material in which the periphery of the processing preparation hole is raised from the other part, and forming a metal part cut from one side of the metal material by sieving into a thin plate continuous with the metal material. A method for manufacturing an electron gun electrode characterized by the following.

14. The method for manufacturing an electron gun electrode according to claim 13, wherein all of the raised portions are sieved.

15. The method for manufacturing an electron gun electrode according to claim 13, wherein a part of the raised portion is shaved.

16. The method for manufacturing an electron gun electrode according to claim 13, wherein after forming the thin plate, coining is performed on a portion of the thin plate.

17. The method for manufacturing an electron gun electrode according to claim 13, wherein the thin plate is provided with an electron beam transmitting hole.

18. The method for manufacturing an electron gun electrode according to claim 16, wherein an electron beam transmitting hole is formed in said coining molded part.