TW442812B - Cathode structure and electron tube using the same - Google Patents

Abstract

A cathode structure (31) comprises a cylindrical sleeve (37) and a cathode pellet (41) made of a sintered material of nickel powder, electron emission agent powder, and rare earth metal oxide powder. The cathode pellet is inserted and fixed at one end of the sleeve. In the cathode structure, the sleeve has one end thereof sealed and also has at its sealed end face a recessed portion (39) of a diameter larger than the cathode pellet in which to insert and fix the cathode pellet. A predetermined space is provided between an outer circumferential surface of the recessed portion (39) arranged no the inner side of the sleeve and an inner circumferential surface of the one end of the sleeve (37). This space is used to accommodate a caulking jig.

Description

4428 彳 2 Case No. 88113923 V. Description of the invention (1) M · W 4 correction supplement [Background of the invention] 1. Field of the invention The present invention relates to a cathode structure, and more particularly to a type used in CRT. (Brian tube) and the cathode structure of the CDT (color display tube or ^ | display tube), and also about the combination of the cathode structure ^ | sub tube. *; 2. Description of the know-how: The cathode with the function of emitting electrons has traditionally been used as cathode ray tubes (CRT, CDT) such as Blaine tubes, and has undergone various improvements to increase the structure of the cathode. Efficiency, and perform the desired function with a tiny power supply. Japanese Laid-Open Publication (JP-A) No. Hei-9-231900 (hereinafter referred to as the conventional technology 1) discloses a preferred embodiment of a cathode structure that can be applied to industries in recent years. In the conventional art, the cathode structure basically includes a cathode sheet made of a sintered electron emitter powder material, a cap for containing and covering the cathode sheet, and a pass through the cap. In the sleeve of the heater that contains the heated cathode sheet, the three elements of the cathode sheet, cap and sleeve are gathered together to form a cathode structure. In a more specific part, the fabrication of the cathode is performed by inserting a cathode sheet into the cap, installing it in a tube, and performing resistance or laser welding around the tube, so that the cathode, The cap is firmly welded to the sleeve and comes together at the same time. < Niu Zheng's cathode structure makes the weight, cost, and power loss further i, low and more stable mass production, further thermal efficiency improvement, and finally

442812 V. Description of the invention (2) Precise assembly of the product is bigger. One step to reduce costs in cathodic construction is when it is difficult to explicitly gather an A in the case because of this. Before the above-mentioned casing reaches the β, the cathode, the shield and the casing glow joint are connected and welded. The heat transfer heating period results in electrical characteristics, and its ease is also expected. The pressure of cost reduction is higher than that in the conventional hood, or after the back, such as when there is only a gap in the less welded part, so it is achieved. Generates heat to a level high enough that it cannot be completed ^ In construction, it is completely in line with the description of the production period and the weight of the cathode. 0, the cathode structure has a rise, the need for a cap and increase-when in the tube, it is used to insert some When the component is in the dimensional accuracy cathode structure, when the cap and the cap's hot-hot stream will deteriorate, the sheet will be inserted between the cap gap and the tube. Examples may become gaps. The components will have degradation. The shortcomings of the heater sub-propellant addition, which will lead to a serious reduction in the size of adjacent components, and the need to maintain stable productivity are the disadvantages: when the three costs. In addition, when the cap is attached, the components are different. This action also warms the cathode of the bushing which is not fully welded, and welds the three components to the spring, and when the cathode is connected with a laser, the bushing is thick, which causes the cathode to be the cathode sheet in the above cathode structure. The temperature setting temperature predicts the failure of the cathode temperature. This will make use of electronics such as CRT

Hi 442 8 彳 2 V. Description of the invention (3) If it is not as serious as above, these problems will make it difficult for the cathode structure to be placed in the current production line of electronic tubes such as CRT, and at least the cathode structure cannot be used as having known characteristics Of components. Finally, as described above, even though various methods have been improved, the cathode structure having three components welded together may encounter difficulties in applying low cost, high precision, and high volume production. Therefore, it should be recognized that the structure of the cathode structure is not appropriate. The necessary and most important subject is to complete a structure that can be mass-produced with high accuracy and low cost, and to fully utilize the characteristics of the cathode structure. Regarding mass production models or methods to solve these problems, a practical solution is also needed. [Summary of the Invention] An object of the present invention is to provide a cathode structure which can be mass-produced with high precision and low cost by changing the structure of the cathode structure, and also provides a method for manufacturing the cathode structure. Another object of the present invention is to provide a cathode structure which can be mass-produced and finished stably in large quantities with accuracy and low cost .. Full_ 利 ... 里 _ 其 ·. Belongs to, and also provides a method of manufacturing the Method of cathode construction. Another object of the present invention is to provide a method for manufacturing a sleeve for a cathode structure. Another object of the present invention is to provide an electron tube using the cathode structure. A cathode structure manufactured according to a feature of the present invention includes a pillar

Page 9 442812 V. Description of the invention (4) Shaped sleeve and cathode sheet made of sintered nickel powder, electron emitter powder and rare earth gold oxide powder material. The cathode sheet is inserted and fixed to one end of the sleeve. "In the characteristics of the present invention, the sleeve has a recess with a diameter larger than the cathode month at the sealed end thereof, wherein the sealed end is formed by sealing one end of the sleeve It is formed and arranged to insert and fix the cathode sheet. The recess Ϊ ϋ Ϊ Ϊ ί The outer periphery of the recess inside the tube ^, which is-predetermined "opposite the inner peripheral surface of the end of the sleeve. According to another characteristic of the invention, the cathode structure includes a cylindrical sleeve And a cathode sheet made of sintered nickel powder, electron emitter powder, and rare earth metal oxide powder. The cathode sheet is inserted into and fixed to the end of the sleeve @ In the characteristics of the present invention, the sleeve has Also formed by sealing the end of the sleeve, the sealing end face also has a U-shaped cap. The υ-shaped cap has a bottom fixed to the sleeve to seal 嫂 # Η # 姑 π 署 w # ^, And the diameter is larger than that of the nickel nickel. ° Into the groove of the fixed cathode plate. The 帽 -shaped cap is another feature of the sleeve, which is provided with a fill-in-cylinder in the cylinder. When the cathode plate Inserted: in the gap: In the characteristics of the present invention = the gap filling fixture is provided to fix the cathode [. The = compound in the east # 魟 sintered nickel powder, electron emitter powder and rare earth metal part and can be moved to The center of the center = the jig contains a concentric circle around the inner concavity with a concentric circle. The points Loss of formula may be such that the inner periphery of the pawl recess is indeed in contact with the female portion of the pole piece and the recess filled simple sequence I disc. Which was used without damage to the female

442 8 1 2

According to another characteristic of the present invention, there is provided a method for manufacturing the cathode sheet, comprising the steps of uniformly mixing nickel powder, electron emitter powder and rare earth metal oxide powder 'the powder will be sintered by mixing-will ... Incorporating a cathode sheet into a cathode sheet and inserting and fixing the cathode sheet to one end of the sleeve β In the characteristics of the present invention, the sleeve has a sealed end ′ and also has a recess formed on the end face of the seal. The cathode sheet opened in the recess is inserted into the recess, and is mechanically fixed. According to another characteristic of the present invention, 'a method for manufacturing the cathode sheet is provided', which includes the steps of mixing nickel powder, electron emitter powder and rare earth metal oxide powder uniformly, and sintering the mixed powder to form a cathode. Sheet, inserting and fixing the cathode sheet into the recess of the U-shaped cap, and bonding and fixing the bottom of the cap to a sealed end surface of the sleeve. In the feature of the present invention, 'the sleeve is made of nickel and a cathode sheet having a diameter smaller than the opening of the recess is inserted and mechanically held and fixed in the recess. [Brief description of the formula] FIG. 1A is a half cross-sectional view showing the overall structure of the cathode structure according to the conventional technology 1. FIG. 1B is a partially cut perspective view of the cathode sheet of FIG. 丨 A; FIG. 1C FIG. 1D is a partially cutaway perspective view of the cap of FIG. A; FIG. 1D is a partially cutaway perspective view of the sleeve of FIG. 1a; and FIG. 2A is a front half of the first embodiment according to the present invention. Cross-section view; Figure 2B is a part of the cathode sheet of the cathode structure of circle 2A, cut away and erected

V. Description of the invention (6) Figure, Figure 2C is a partially cut perspective view of a sleeve of a cathode structure of circle 2A; Figure 3A is a plan view showing a cathode structure according to a first embodiment of the present invention; Figure 3B It is a front half-to-plane view of the cathode structure of FIG. 3A, FIG. 4 is a diagram showing the relationship between the temperature of the cathode and the number of electrons emitted; FIG. 5A and FIG. 5β are diagrams used in FIGS. 3A and 3B The embodiment of the casing is a plan view and a partially cut cross-sectional view; the example illustrates the representative shape and size of the casing of FIG. 5 as well as the male seal: '童 # 管 系 The groove of the present invention is at the front end; FIG. 7A is a plan view of a casing showing a root tube; FIG. 7A is a cathode structure according to a second embodiment of the present invention. FIG. 7B is a set of FIG. 8A Is a cross-section view of a cut-away Q-tube according to a third embodiment of the present invention; a sectional view; a circle 8B is a sleeve of FIG. 8A; FIG. 9A is a cut-out horizontal Sectional view, plan view; forging the cathode structure of the fourth embodiment of the present invention

FIG. 9B is a cross-section of FIG. 9A; ^ A FIG. 10A is a cross-sectional view showing a cut according to a tube; a horizontal cross-sectional view with a gap; Description of the Invention (7) FIG. 10B is a vertical cross-sectional view of FIG. 10A of a thread ABCD; FIG. 11A is a horizontal cross-sectional view of another gap filling jig according to a fifth embodiment of the present invention; 11B is a vertical cross-sectional view of FIG. 11A; FIG. 12 is a schematic cross-sectional view of a cathode structure according to a sixth embodiment of the present invention; FIG. 13 is a cap portion showing the cathode structure of FIG. 12 Fig. 14 is a drawing for explaining the manufacturing of the cap shown in Figs. 12 and 13; Fig. 15 is a drawing for explaining the manufacturing of the cathode sheet of Fig. 12; Fig. 16 is an example for illustration The shape of a cathode sheet manufactured by a conventional stamping method; and FIG. 17 is a cross-sectional view showing the principle of manufacturing the cathode sheet of FIG. 15. [Symbol description] 2 1 ~ cathode structure 2 3 ~ cathode sheet 2 5 ~ cap 27 ~ heater 29 ~ casing 3 1 ~ cathode structure 3 3 ~ cathode structure main body 3 5 ~ heater 37 ~ casing

Page 13 442 8 12 V. Description of the invention (8) 3 9 ~ Concave part 41 ~ Cathode sheet 4 3 ~ Ring flat part 45 ~ Large diameter part 4 7 ~ Conical part 49 ~ Opening 5 7 ~ Claw 61 ~ cathode structure 63 ~ welded part 65 ~ inner bottom surface of recessed portion 6 7 ~ cathode structure main body 69 ~ bottom outer peripheral surface of recessed portion 71 ~ gap filler 73 or 75 ~ external member 77 or 79 ~ inside Member 81 or 83 ~ Claw 9 1 ~ Cathode structure 93-Ni sleeve 9 5 ~ Cap 97 ~ Mold 99 ~ Convex hill 101 ~ Convex hill 1 0 3 ~ Groove 105 ~ Assembly

Page 14 V. Description of the invention (9) --- 107 ~ clamping member I 0 9 ~ dual structure die 111 ~ punch 113 ~ first die II 5 ~ second die [Description of the preferred embodiment] Ongoing Prior to the description of the preferred embodiment of the present invention, the cathode structure of the conventional technology will be described with reference to FIGS. 1A to 1C to improve understanding thereof. ^ As shown in FIG. 1A, a cathode structure 21 basically includes a cathode sheet 23 made of a sintered electron emitter powder material, a cap 25 for receiving and covering the cathode sheet 23, and a penetrating The cap 25 has a sleeve for accommodating a heater 27 for heating the cathode sheet 23 and a sleeve for accommodating the cathode structure 21. The cathode structure 21 is assembled by inserting a cathode sheet 23 into the cap, 25 Install it in the casing 29, insert the heater "and others into the casing 29, and perform resistance or laser welding around the casing 29 to make the cathode 23, cap 25 and casing 29 Welded and gathered together. The heater 27 can be inserted after welding. In the female structure 21, the weight, cost, and power loss are further reduced. More stable mass production, further thermal efficiency improvements, and precise assembly of the final product. Is easier than expected. The pressure to reduce costs is greater than ever

442 8 1 2

In the cathode structure 21, it fully meets the requirements by reducing the size of adjacent components: the weight and the point of maintaining stable productivity during mass production are. When the two difficulties are difficult to clarify, the cathode structure 2 has: Inadequately, when the various kinds of pieces are gathered together, a cap is needed to increase the size. In addition, when the cap 25 is inserted into the jig, the required degree of each component is different. This also increases the cathode temperature from the sleeve 29 to the cap 25 during welding in the cathode structure 21 described above. 'Into the sleeve 29' is used for fixing and 'because these components are precisely machined in size. 'When insufficient heat conduction between the cap 25 and the sleeve 29 will be deteriorated, resulting in the gap due to vibration or the spring on the back after the cathode sheet 23 is inserted into the cap 25 and before the three components are welded together. It acts between the cathode sheet 23, the cap 25 and the sleeve 29. For example, when only laser welding is used, the welded portion at the bottom of the sleeve 29 may become thicker than the unwelded portion, causing the cathode sheet 23 to float and form a gap. If there is a gap between the welded components, the heat conduction of the cathode structure 2 and the cathode sheet 23 described above will be deteriorated. Therefore, the expected temperature of the cathode sheet 23 cannot be achieved by the heater 27 during heating. Failure to produce a predetermined cathode temperature necessarily results in failure to heat the electron emitter to a sufficiently high temperature. This will cause a change in the characteristics of the cathode, making it impossible to fully utilize the characteristics of the electron tube such as CRT, which will cause serious defects. If it is not as serious as the above, these problems will make the cathode structure difficult to be placed in the current production lines of electron tubes such as CRT, and at least it will not be used.

Page 16 4428 1 2 V. Description of the invention (π) The cathode structure is a component with known characteristics. Finally, as mentioned above, even though various methods have been improved, the cathode structure with two redundant parts may encounter difficulties in applying low cost, high accuracy, and mass production. Therefore, it should be acknowledged that the structure of the cathode structure is not appropriate. The necessary and most important theme of θ is to complete a structure that can produce mass with high accuracy and low cost, and to fully utilize the characteristics of the cathode structure. Regarding mass production models or methods to solve these problems, a practical solution is also needed. -Now 'an embodiment of the present invention will be explained with reference to Figs. 2A and 2B to Fig. 17. For reference, 2A and 2B ', the cathode structure 31 according to the first embodiment has a cathode structure main body 33 in which a heater 35 is inserted. The cathode structure main body 33 has a set of tubes 37, and the sleeve has a cathode sheet 41 inserted into and fixed to a recess 39_ of one of the sealed ends of the sleeve 37. As shown in FIGS. 3A and 3B, the cathode structure main body 33 includes a sleeve 37 and a cathode moon 41. The sleeve 37 of the cathode structure main body 33 is made of nickel, similarly as described later with reference to FIGS. 5 to 9. The shape of the sleeve 37 is similar to a conventional sleeve and a cap combined together, and a sealed end portion is formed by the recess 39 and an annular flat portion 43 'wherein the annular flat portion connects the outer edge of the sleeve 37 The part is connected to the edge of the recess 39. The other end of the sleeve 37 is a large-diameter portion 'having an opening 49 and a tapered portion 47 at the inner end of the large-diameter portion 45. The cathode sheet 41 is formed by mixing nickel powder, electron emitter powder and vermiculite metal oxide powder uniformly, and sintering the mixture at a high temperature or

Η ^ 42 8 1 2

Pressurization and forming process < Therefore, the cathode sheet 41 can easily generate a south current density-so different-when electrons are stably applied to the grid holes placed in the electron emission direction of the cathode sheet ... There is no need for large diameter puncta. The cathode H41 is inserted and fixed to the recess 39 on the end face of the sleeve 37. »When the cathode sheet 41 is made of a sintered material of nickel powder, electron emitter powder, and rare earth metal oxide powder, the possibility of the sleeve 37 of the cathode structure body 33 is possible. The material usually contains nickel or a nickel-chromium alloy material. In the present invention, a nickel-chromium alloy material is used. "As shown by the line 51 in Fig. 4, this is because when the nickel material is used as the sleeve 37, the emission characteristics are significantly reduced. However, the use of nickel-chromium alloys will produce satisfactory emission characteristics, as shown by line 5-3. When the weight percentage of chromium is 80.20, the composition of the nickel-chromium alloy will produce an excellent emission characteristic. Through research by the inventors of the present invention, they have found that nickel-based alloys having 15-25 wt% chromium can produce comparable emission characteristics. When the composition has a chromium content of less than 15 wt% or more than 25 wt%, during a cathode start-up required to provide excellent cathode emission characteristics, program control for generating satisfactory emission characteristics becomes difficult . Therefore, the nickel-based alloy preferably has a chromium content of 15-25% by weight. In addition, because chromium is required for electrons to be emitted from the cathode sheet, nickel is required as a U-shaped cap. As shown in Figs. 5A and 5B, the supply of the recess 39 at the front end of the sleeve 37 means that when the cathode sheet 41 is installed and fixed to the recess 39, it is gap-fixed. That is, as described later, the cathode piece 41 inserted into the concave portion 39 of one end of the sleeve 37 can be fixed by filling the gap. It is used—the inner group installed in the sleeve 37.

Page 18 12 4428 V. Description of the invention (13) = J-An interstitial component formed by an external component installed outside the casing is inserted outside the recess ⑼ formed in the casing 37 3 = ^ 官 37 — The interval or gap between the inner peripheral surfaces of the ends. & = The assembly is inserted outside the sleeve 37. In this situation, therefore, the cathode structure main body 33 shown in Figs. 5A and 5B has a marginal structure. Caulking can be done even in the assembly of precision-manufactured components. This gap can stabilize the position of the cathode sheet 41 in the cathode structure main body 33 and allow it to be accurately and easily positioned. At the dense end of the sleeve 3, the second supply recess 39 enables it to meet the requirements for weight reduction and assembly reduction in recent years. Now, a method for manufacturing a cathode structure according to a first embodiment of the present invention will be described. Fig. 6 shows a representative shape and size of the sleeve 37 of the cathode structure main body of Figs. 5A and 5B with example dimensional tolerances. Dimensions are in millimeters (mm) ^ Shown here is an example of a sleeve 37 formed with a 39 ° sleeve at the end of the sleeve formed by the first embodiment of the present invention The tube 37 is manufactured by drawing a chrome-plated alloy sheet as a sleeve material. Unlike the conventional technique of forming a tube and a sleeve sealed at one end, for the first embodiment of the present invention, a recess 3 9 is formed at one end of the sleeve material, and the immediate processing does not need to be pulled close to the recess 3 9 The straight part. That is, the drawing should be performed so that the first reduction in the thickness of the sleeve-tube material is maintained within 7%. The reason is that a reduction in thickness of more than 10% will cause insufficient thickness and support when the recess 39 is formed. The end is not strong enough. Next, 'a predetermined punch is pressed against the sealing end surface of the sleeve material' while the tube is pulled and fixed by the mold to keep it still. In this situation, a crack-free recess 39 is formed by the depth 'obtained by a single press-fitting operation that maintains the desired depth of the recess 39 of 5-10%. If the degree of forming obtained by a pressing operation is greater than 15%, the thickness of the curved portion at the entrance of the recess 39 will become too thin, making the accuracy and strength unstable, which is a disadvantage to avoid the bottom of the recess 39. The strength of the peripheral part is not reduced by rapid forming. A punch is provided to make the recess 39, and two kinds of non-. FIG. 6 shows the dimensions of a sleeve with a recess 39 (hereinafter referred to as a grooved sleeve, which is manufactured by the above-mentioned process. In the illustrated example, the cathode sheet 41 has a diameter of 0.8ππη and a thickness of 0.22mm. The recesses 39 of 5A and 5B have a depth of 0.2 mm and an inner diameter of 0.8 mm. The degree of right angle of the recesses 39 to the periphery of the sleeve 37 is directly related to the characteristics of the CRT after the cathode structure is assembled. In the example shown, the The value system is in the precise range, which has a considerable impact on the direction and stability of the electron emission. When assembling the electronic grab, the air of the air micrometer is blown out of the grid hole to the cathode surface to measure the grid-cathode distance. Adjusted and fixed to a dimensional accuracy such as 120 ± 2 microns. This measurement method assumes that the cathode surface is not tilted, so as the tilt of the cathode surface increases, it becomes difficult to tell where the distance is measured, As a result, the accuracy of the grid-cathode distance will be reduced.

Page 20 4428 t 2 V. Description of the invention (15) (cut-of 〇 abnormal increase. This is not expected. In addition, when the cathode surface inclination increases, the distribution of the emission potential (should be axisymmetric) will change It is asymmetric, which deforms the electron beam and degrades the focus on the screen. Because the degraded focus cannot be corrected by cutting the abnormality, it can be adjusted to be more severe than the cutting abnormality. Next, one uses a grooved sleeve 37 The method of fixing the cathode sheet 41 in the cathode structure will be described in detail. In this case, the 'cathode sheet 41 is inserted and fixed in the recess 39 of the upwardly-opening sleeve 37. The inner surface of the recess 39 is repaired by stamping. Side, so there is no mechanical problem when fixing the cathode sheet 41. The use of a grooved sleeve 37 will support 1 side | rabbit 』41 phoenix hat leather. Because the cost of the grooved sleeve 37 is much lower than that of the cap and the sleeve The total cost of the tube, so the manufacturing cost can be reduced by reducing the manufacturing cost of the cap and reducing the assembly cost of inserting the cap into the sleeve. In addition, because the cap and the sleeve are gathered together, the two There is no incomplete heat conduction between species Possibility. When the cathode sheet 41 is laser welded due to the bottom section of the recess 39, fill in the gap before welding to prevent the cathode sheet 41 from floating on the recess system: When welding the part, a more specific sentence was used to indicate 'the sheet 41 at the front end of the sleeve 37.' It will be described in detail with reference to FIGS. 10 and 1], and the recess 3 9 is mechanically interstitial to fix It is also important that the cathode 41 is not misplaced or dropped during processing.

442812

5. Description of the invention (16) This 'interstitial' is also applied to the leading edge of the grooved sleeve 37 with a force of about 100 g. When the interstitial force is greater than 200 g, the cathode sheet may be broken 'cannot provide sufficient fixation with an interstitial force of about 500 g. It causes the inner surface of the cathode 39 in the recess 39 at the front end of the tube 37 to be tightly contacted and fixed to the ground, and resistance welding or laser welding can be performed. It is based on the third embodiment as a more specific and detailed example. Instructions. 4. When using a sleeve of the shape shown in Figures 3A and 3B, it is best to use _Welding. The closer the recess 39 is to the outer diameter of the front end of the sleeve 37, the more difficult it is to perform laser welding at the bottom of the recess 39. Therefore, in this state, 'resistance = two or spot welding can be performed by four to eight points (preferably six to twelve points) on the periphery of the front end of the recess 39 to completely fix the cathode sheet and the recess in a tight contact state. . The welding conditions are determined based on mass productivity, cost, and the like. The laser welding is performed through the bottom opening 49 of the grooved sleeve 37-the laser beam is on the back surface of the recess 39. In this case, the output condition is selected from a range of conditions that will not cause a hole to be melted in the grooved sleeve 37. The range of energy used for welding 'Cross section viewed after assembly, its cathode sheet 4] is completely fixed to the bottom of the sleeve 3 7 recess 39 in a tight contact state, the higher the energy value, the better the β part of the material is heated by The state where the cathode sheet 41 inserted into the recessed part 39 floats on the recessed part 39 can not exist. The combination of interstitial and resistance or laser welding at least H eliminates the possibility of the cathode sheet 4 floating in the recess 39. In addition, this will make the heat conduction from the grooved sleeve 37 to the cathode sheet 41 more reliable. In order for the cathode sheet 41 to be in close contact with the grooved sleeve 37 surely,

Page 22g V. Description of the invention (17) When the slot sleeve 37 is filled by its periphery, the inner rising shaft system provided with the recessed portion of the slot sleeve 37 that partially engages the fixture in the cathode sheet is quite effective. This is described with reference to FIGS. 7A and 7B. This is done by sharpening the front end of the interstitial fixture and protruding it into the cathode sheet during the interstitial process, and this method is completed during the interstitial process "& This means that the cathode sheet inserted in the recess 39 will Does not float. Especially when used in CRT (Brian tube), the obtained cathode structure can reduce cost and size, and mass-produce with high accuracy and stability. It also has the advantage that it can be assembled with high precision during the final assembly process, which can make the electron emitting agent easily reach a predetermined temperature range. From the above, it is understood that the cathode structure according to the present invention can be applied to CDTs used in personal computers and the like. Next, a second embodiment of the present invention will be explained. 7A and 7B, the sleeve 37 of the cathode structure main body according to the second embodiment is formed of the nickel-chromium alloy of the first embodiment, but the difference from the grooved sleeve 37 of the first embodiment is that Before the cathode sheet 41 is inserted and fixed to the sleeve 37, the sleeve 37 is formed with fixing water 57 'at four corners to fix the cathode sheet 41 to the inner surface of the recess 39 of the sleeve 37. That is, the second embodiment has a structure in which the nickel-chromium alloy protrusion enters the groove from the periphery of the inner surface of the recess when the cathode structure is polished from the upper surface of the cathode sheet. The fixed central claws 57 are preferably arranged symmetrically. The number of the fixing jaws 57 is not limited, and the only requirement is that two or more should be used. Actually ’any number of lost claws can be used, as long as it ’s formed without difficulty》

Page 23 442812 5 'Explanation of the invention (18) During the process of forming the sleeve 37 into a shape, protrusions of a size that can be recognized by the naked eye are formed on the inner surface of the recess 39. When the cathode sheet 41 is inserted and fixed, the fixed clamping claw 57 is in contact with the cathode sheet 41 and is partially engaged with the cathode sheet. By this method, the tightness provided by the fixing jaw 57 and the filling system is improved, and the reliability of the fixing obtained by welding with the rear ridge is improved. As shown in FIGS. 8A and 8B, the cathode structure 61 according to the third embodiment of the present invention has a structure in which the inner surface of the recess 39 at the front end of the sleeve 37 and the cathode sheet 41 are laser-welded and welded. The portion 63 is formed at its interface. The laser is projected from the bottom periphery of the recess 39, that is, from the bottom opening of the sleeve in Figs. 8A and 8B, so that the laser will not impact the periphery of the inner bottom surface 65 of the recess. _ In addition, before the cathode sheet is fixed by the above-mentioned process, one side of the cathode sheet 4m is in contact with the bottom of the recess, and nickel-plated with an ion-bonded film to a thickness of 0.02 ± 0.1 micron. This will produce a cathode structure 61 having an excellent level of cathode moon contact. As the thickness of the nickel film increases, the cost also increases and heat conduction to the cathode sheet 41 may be hindered. On the other hand, when the nickel film is smaller than 0.1 micron, the zinc film can be bismuth x each-into the field X silk film ^ ^ ^ M ^ 蜾 can not be completely deposited on the entire surface of the system Intricately cut: Therefore, the thickness of the deposited film is actually effective in the above-mentioned range of 0.2-0.1 microns. Referring to the tree 9A and FIG. 9β, the cathode structure main body 67 according to the four embodiments of the present invention uses resistance welding. The cathode of the embodiment is welded instead of the laser used in the third embodiment.知 接。 Know. In this case, when the upper surface of the cathode sheet 41 is fixed, it is introduced into the bottom opening of the sleeve of FIG. 7B and contacts the bottom outer peripheral surface 69 of the recess 39. Mu Ming At this time, because resistance welding is used,

Page 24 442812 Description of the 5 'invention (19) The cathode sheet 41 and the recess 3 9 bottom surface 65 must be in contact with each other, and more reliable preparation is required than using laser welding. In addition, 'If one side of the cathode sheet 41 is ion-coated with one of nickel, titanium, indium, nickel, copper, copper, niobium, and niobium to a thickness of about 0.02 ± 0.1 micron before welding, I can obtain And stable. Black country. Fixed cathode. The cathode plates inserted and fixed according to the first and second embodiments are in close contact with the recesses, and then connected to the fourth embodiment according to the third and fourth embodiments. In the fabrication of the negative plate I completed by this method, the negative electrode sheet 41 and the sleeve 37 are very closely spores, and will not be separated from each other after the subsequent assembly process. As is known in the art, a cathode structure having a recessed portion 39 at the front end of the casing (which is made of a metal having excellent formability) is based on, for example, Japanese New Patent Publication No. Hei 6-1 7095 (hereinafter referred to as conventional technology) 2) was proposed. In the cathode structure proposed by the conventional technology 2, the diameter of the recess 39 is almost equal to the diameter of the front end of the sleeve. Therefore, the outer peripheral surface of the recess on the inner side of the sleeve is in contact with the inner peripheral surface of the sleeve. That is, there is no gap or gap between the inner peripheral surface of the sleeve and the outer peripheral surface of the recess. Therefore, the cathode structure disclosed in the conventional technique 2 cannot provide a gap margin for inserting a gap fixture. Therefore, by using the known technology 2, it is necessary to lower the thickness of the fish by 1 m and fill it into the concave silver. "This means that, compared with the use of gaps to fix the cathode sheet to the casing, the agricultural production of the first" cathode structure soldier " There is a weaker _yin. Grip Fan J3 constant strength. In addition, in the cathode structure manufactured according to the present invention, the cathode sheet can only be moved by 0.6 degrees in the vertical direction, as shown in FIG. 6. Therefore, the height variation of the cathode sheet 41 (0.8 mm diameter) along the periphery of the electron tube can be maintained at 10%.

Page 25 4428 1 2 V. Description of the invention (20) Because the cathode sheet of the electron emitter is extremely tightly fixed within the micron, the heat from the heater can be conducted to the cathode sheet very efficiently, and the generated electron emission Will work efficiently in electronic tubes. Therefore, it should be understood that the temperature distribution is easy to uniform, and it makes an excellent contribution to power saving. Secondly, the caulking operation of the cathode structure according to the fifth embodiment of the present invention will be described with reference to FIGS. 0A, 10B, 11A, and 11B. In the examples shown in Fig. 10A, Fig. 10B, Fig. Ha and Fig. 11B, an interstitial jig system is shown. The caulking tool 71 has an outer member 7 3 or 75 which is inserted on the outside of the sleeve 37 and an inner member 7 7 or 7 9 which is inserted on the inside of the sleeve 37. At the front end of the inner member 77 or 79, a plurality of grippers 81 or 83 are provided to insert a space (ie, a gap) between the outer peripheral surface of the recess 39 on the inner side of the sleeve 37 and the inner peripheral surface of the sleeve 37. between. When the cathode sheet 41 is inserted into the recess 39 and fixed by a gap, these jaws 81 or 83 are effective for stably holding the sleeve and the straight shaft portion of the recess 39 on the inside of the sleeve. In FIGS. 10A and 10B, examples in which the gripper 81 is set at four positions are described. These jaws 81 are placed into a gap of about 0.3 mm thick which will form a gap margin at the front end of the sleeve and cover the recess 39 of the sleeve shown in Figs. 5A and 5B. These jaws 81 also serve as fixing brackets 'so that the gap is not exhausted and contacts the inner sleeve (the outer peripheral surface 69 of the recessed portion) which is longer than 2' 03 mm. With these jaws 81 inserted between the sleeve 37 and the recess 39, the gap-filling external member 73 is moved toward the center of the sleeve 37 to fix the external member 73 shown by the cathode sheet 41 β in the recess 39. Divided into four parts 85. For a more detailed description of the parts of the interstitial jig for direct application of force 8 5

Page 26 442812 Description of the invention (21) Push the outer periphery 87 located at the front end of the sleeve to the inside. This will tightly fix the cathode 41 to the recess by the rigidity of the sleeve material ^ At the same time, insert it into the sleeve and the rigidity is greater than „The cutting claw 8 composed of the material of the cutting camp 27 will be located at the periphery of the © part 39 of the front end of the sleeve 3J 8 7 gaps to securely fix the cathode sheet 41. In this way, the gaps are filled. During operation, it was found that without the need to excessively deform the outer periphery 87 of the front end of the tube, a sufficient fixing effect can be produced, that is, smooth assembly is ensured by suppressing the deformation of the front end of the cathode. It is also found that the gap is filled The internal components of the fixture 71 can be smoothly extracted after the filling operation. In addition, the gap will produce a fixed state in which the outer peripheral surface 6 9 almost maintains a slightly reduced diameter of the circular recess 39. Figures 11A and 11B show The number of clamping jaws 83 is increased to eight (concentric circle arrangement), which is an example of a device for performing a method that can produce less deformation than the peripheral portion of Fig. 10A and Circle 10B. In this example, the peripheral area 69 has an improved A fixed state with a circular shape and a slightly reduced diameter of the recess 39 was obtained. In this example, it was also found that the internal components of the caulking fixture 71 can be smoothly extracted. Next, reference will be made to the sixth embodiment of the present invention FIGS. 12 to 17 are said to be 12 and 13. According to the sixth embodiment of the present invention—Yinshanzao 91 has a smaller structure than the conventional technology, except that one of the nickel sleeve 93 is sealed and capped. The bottom of the cover 95 is specially processed. If the conventional technique is used, the cathode sheet 23 is attached to the bottom of the u-shaped cap 95 (on the heat transfer side) by laser welding to securely fix it. Get foot

Page 27 442 8 1 2 V. Description of the invention (22) However, when the cathode structure is assembled as shown in FIG. 12 (this structure is often used), the cathode structure There is a convexity or strain on the top, which will cause a gap between it and the cap 95, and the problem that the stable t characteristic may not be utilized. The U-shaped cap 95 shown in FIG. 13 is formed by drawing. As shown in FIG. 14, the mold 97 forming the bottom of the cap 95 has an appropriate hump 99, and the bottom of the hood 95 is tied to the groove 103 and recessed inwardly during the sleeve drawing process. 101 is raised, which reduces the plate pressure. Unlike nickel, it is found that nickel-chromium alloys (nickel: chromium = 80:20) are resistant to drawing operations and do not require heat forming. Therefore, after forming, the cathode sheet is adhered in the cap and held by the cap opening side under pressure, and the periphery of the cap is welded. This process has proven effective in flattening the bottom of the cathode sheet and bringing it into close contact with the cap. On the other hand, nickel cannot resist the deformation of R 3 located in the groove 103, and the micro-cracks (the extremely small gaps that cannot be recognized by the naked eye) are caused in the bulge portion of the bottom of the cap, so it cannot provide a reliable structure. In particular, the groove 103 is formed by pressing using a mold 97 provided with a convex portion of about R3. The U-shaped cap 95 formed in this way has a raised bottom portion of about 10 m ', as shown in FIG. 14, which provides a flat bottom of the cap having excellent returning force after the cathode sheet is installed. The welding of the periphery of the cap 95 shown in FIG. 13 needs to be directly completed from the outside with a welding spot diameter of 0.1 mm and an output of about 0.4J. This process provides a sufficient fixed state. The assembly shown in FIG. 13 composed of the cathode sheet 23 and the I] -shaped cap 95

Page 28 V. Description of the invention (23) ---- 105 has an extremely flat bottom and excellent operability. Therefore, when the assembly is connected and fixed to the nickel sleeve of FIG. 12, it can be fixed by welding or steel welding and has excellent mass productivity. In addition, if the cathode sheet 23 is produced by a shaving method as described later, the heat conduction becomes more stable. This is confirmed by the temperature change of the cathode 23 to ± 10 ec and to ± 5. The nickel-chromium alloy used is # NR20 made by Sumitomo Tokushu Kinzoku. This temperature variation is significantly reduced. The cathode sheet 23 may have a larger diameter, so it is important to confirm the flatness of the bottom having a diameter of about 1.3 to 1.5 mm. Next, the shavings of the cathode sheet 23 will be described with reference to Figs. Η to 17. The cathode is traditionally cut by a simple cutting method, so as shown in FIG. 16, the bottom 23a is larger than the cutting direction 101. If the cathode sheet is installed in the U-shaped cap 95 or the sleeve shown in FIG. 5A, FIG. 5B, FIG. 6, FIG. 7A, FIG. 7B, FIG. 8A and FIG. 8B, the large diameter side is Will be the bottom of the groove. Therefore, when the peripheral portion is fixed by caulking or pressing, the front end of the large-diameter portion or the bottom of the groove may collapse or rupture is not a concern. As shown in Fig. 15, a dual-structure mold 109 is used, which is composed of a first mold 113 and a second mold 115 which are stacked and held by a holding member 107. The second mold 5 is about 5 microns narrow. Generally, when cutting by the punch 111, the cathode sheet 23 has a scraped surface as shown in FIG. However, since the first mold 115 is set in the same mold 109 as shown in FIG. 15, the peripheral protruding portion at the bottom of the cathode sheet 23 is cut off by the front surface, because

Page 29 442812 V. Description of the invention (24) The trapezoidal cathode sheet shown in FIG. 17 can be avoided. However, if the reverse-cutting impact causes cracks inside the cathode sheet 23, not only these cracks cannot be detected, but also they have a negative effect on the emission characteristics. As a result of various tests conducted, it has been found that a cathode sheet having a bromine content of vol% or more will produce a stable output without cracking. When the second mold 115 of FIG. 17 is operated, the cathode sheet 23 is mainly affected by the shear force, and the existence of the cathode sheet 23 can prevent the brittleness of the cathode sheet 23 from accelerating. The cathode sheet 23 in this example has a diameter of 0.8 mm. With a larger diameter of 1.3 to 1.5 mm, the cathode sheet may have a larger thickness, and in this case, the shavings may significantly improve the cross-sectional shape of the cathode sheet. One such example is a cathode sheet 23 having 51% nickel powder, 48% electron emitter powder, and 1% rare earth metal oxide powder. A cross-sectional observation of the completed cathode structure shows that the fixed state is excellent, and the cathode output can produce stable characteristics in practical applications. Xinji also found that if the cathode sheet 23 contains 40 vol% or more nickel, it is resistant to shavings. In addition, in a cathode structure using a grooved sleeve 37, when the cathode sheet is shaved by shavings, During the cutting (as mentioned above), the temperature change of the cathode was improved to 5 ° C to stabilize its characteristics. The result is similar to the shape of a shavings ^ shaped cap. It has been found that the U cap shape The cathode structure (whose mass production is not traditionally important) can also be mass-produced with sufficient reliability. Another advantage of the cathode structure using this U-shaped cap is that although it is used in many cases The base material that generates the emission is 4 chrome alloy, but Wei can also be used in the camp 'because the long-term experience has proven to be easy.

P.30 442 8 1 2 V. Description of the invention (25) Use. This eliminates the possibility of sputters caused by chromium in the nickel-chromium alloy at startup when the sleeve is made entirely of nickel-chromium alloy. In addition, it should also be noted that, because the grooved sleeve 37 is a single piece member, it will simplify the manufacturing process, reduce the assembly cost, and easily ensure that the cathode sheet is fixed. As described in the above "by the present invention", it is possible to obtain a cathode structure that can be mass-produced with high accuracy and low cost. The present invention also provides a method of manufacturing the cathode sheet and a method of striking a sleeve for the cathode structure. In addition, the present invention can provide an electron using the cathode structure described above.

Claims (1)

4¾ 2 8 12 Case No. 88Π 齐 妁 Ά Amendment / 〇 "月 / IV 多 正 __ 5 1λ«-VI. Patent application scope 1. A cathode structure comprising: a cylindrical sleeve: and a cathode sheet, It is made of a sintered nickel powder, an electron emitting agent and a rare earth metal oxide powder material. The cathode sheet is fixed at one end of the sleeve. Yagu * where the? Tube has a recess at its sealed end, where the Dense = formed by one end of the sealing sleeve, the four parts are formed to insert and fix the cathode sheet and have a larger diameter than the cathode sheet, wherein the outer peripheral surface of the recess formed on the inner side of the sleeve is separated by a predetermined interval. The inner peripheral surface of the end of the sleeve is opposite. 07. 2. The cathode structure according to item i of the patent application range, wherein the sleeve has an annular plane formed between the edge of one end of the sleeve and the edge of the recess. 3. The cathode structure of item 1 in the scope of patent application, wherein the sleeve has an inflamed claw portion 'which is located on the inner peripheral surface of the recess to fix the cathode sheet β 4. The cathode of item 1 in the scope of patent application Structure, in which the cathode sheet is shaved by a chip 0 5. The cathode structure according to item 1 of the patent application scope, wherein the height of the cathode sheet along the periphery of the upper end surface of the cathode varies within 10 microns. sheet Page 32 ~ 8i2 The cathode structure according to item 1 of the scope of patent application, wherein the cathode sheet has, on its end face, a thickness made of one of Ni, Ti, cr, pt, pd, Ta, and Nb, which is 0.2 ± 0.1. Micron film. Modification ^ The cathode structure according to item i of the patent application, wherein after the cathode sheet is mechanically fixed in the recessed portion, the periphery of the recessed portion is gap-filled. ; ^ If the cathode structure of the scope of application for item J is a cathode structure, after the cathode sheet is mechanically fixed in the recess, the cathode sheet and the recess are welded together to fix it to form a welded portion. "As for the cathode structure in the scope of patent application item 8, wherein the welding is at least one of resistance welding and laser welding. • If the cathode structure of item 1 of the patent application scope, the sleeve is made of nickel-chrome 0 gold, which is drawn at a thickness reduction rate of 7% = at the straight main body portion of the sleeve near the recess; and Subsequent depth control is performed when the recess is formed so that the depth obtained by a single pressing operation is maintained at -10% of the recess depth to provide a recess with high accuracy and no cracks. 11. The cathode structure according to item 1 of the application of the kiss patent, wherein the predetermined interval is wide enough to insert a jig for filling the gap between the cathode sheet in the recess. 12. An electron tube, which is combined with a cathode structure, the cathode structure package j consists of burned, knotted powder, electron emitter powder and rare earth Page 33_ 4 42 8 12 Macro No. 8813923 Rev. If six, a cathode sheet made of materials at the end of the scope of patent application and a cylindrical tube inserted and fixed at the end of a cylindrical sleeve-a combination with the cathode structure An electron tube, wherein the sleeve has a recessed portion having a diameter larger than that of the cathode sheet at a sealed end thereof, wherein the sealed end is formed by sealing one end of the sleeve and is provided to insert and fix the cathode sheet, and the recessed portion is formed at The outer peripheral surface of the concave portion inside the sleeve is opposed to the inner peripheral surface of the end of the sleeve at a predetermined interval. 13.-A sleeve as used in the cathode structure in the scope of the patent application: Manufacturing method 'where the sleeve is made of chrome alloy, and a 7 The thickness reduction rate within% is drawn and the subsequent depth control is performed during the subsequent formation of the recesses, so that the depth obtained by the J-single press industry is maintained at 5_ 丨 0% of the recess depth to provide high accuracy And no cracks in the recess. 14. A cathode structure comprising: a cylindrical sleeve; and a thinner system made of a sintered nickel powder and an electron-emitting agent powder made of Naipur ΛΛ powder material, the cathode sheet is inserted and fixed to the sleeve One end of the tube is formed by ② a sealing end face and a U-shaped cap, which is formed by being fixed to the two ends, and the ， -shaped cap with a bottom is formed to select the sealing end face, and the The diameter is larger than that of the K part of the cathode sheet. The cathode plate is inserted and fixed, and the ϋ-shaped cap is made of nickel-chromium alloy mm Page 34 ϋϋ 4 4 2 8 " I 2 Once the article is positive ------- No. 8811: ^ 9¾__ Year 6, the scope of the patent application, such as the cathode structure of the scope of application for item 14, cathode structure, where the u-shaped cap 4 Has a round raised interior. 16. The cathode structure according to item 14 of the patent application, wherein the cathode sheet is 17. The cathode structure according to item 14 of the patent application, wherein the height of the cathode sheet along the periphery of the upper end surface of the cathode sheet varies by 1 Within 0 microns. 18. For example, the cathode structure of the scope of application for patent No. 14, wherein the cathode sheet has a thickness made of Ni, Ti, Cr, pt, pd, "and one of j" on the insertion side end face thereof. 2 ± 0.1 micron thin film Q. The cathode structure according to item 14 of the patent application scope, wherein after the cathode sheet is mechanically fixed in the recess, the periphery of the recess is filled with gaps. The cathode structure of item 14 of the patent scope, after the cathode | sheet is mechanically fixed in the recess, the cathode sheet and the recess are connected together | to fix it to form a welded part. Jii 21 · If the cathodic structure of the scope of the patent application No. 20 'where the welding is at least | one of resistance welding and laser welding. I 22. If the cathode structure of the scope of the patent application No. 14 where the sleeve is 442 8 1 2 '--- _ month, month, and month of article _I six' application for patent scope; made of nickel-chromium alloy, which is drawn at a thickness reduction rate of 7% near the straight line main body portion of the sleeve near the recess ; And subsequent depth control is performed when the recessed portion is formed so that the depth obtained by a single press industry is maintained at a recessed depth of 5-10% to provide a highly accurate and crack-free portion. 23. An electron tube combined with a cathode structure comprising a cathode sheet made of sintered nickel powder, an electron emitter powder and a rare earth metal oxide powder, and a material inserted into and fixed to a cylinder A cylindrical tube at the end of the tube-shaped tube, an electron tube combined with the cathode structure, wherein the tube has a sealed end surface formed by sealing one end of the tube and a U-shaped cap, which has a bottom-shaped cap The cover is fixed to the end face of the sleeve, and a recess having a diameter larger than that of the cathode sheet is formed to insert and fix the cathode sheet. The u-shaped cap is made of nickel-chromium alloy. 24 ·, an interstitial jig for fixing a cathode male at one end of a cylindrical sleeve, wherein the cathode sheet is made of a sintered nickel powder, an electron emitter powder, and an earth metal oxide powder material. When or after the cathode sheet is inserted into a recess on the sealing end face, the gap-filling jig for filling the cathode sheet with the recess at the end of the tube includes:, arranged in a circle around the recess and movable toward The center separate clip 2 昤 the separate gripper can make the inner peripheral surface of the concave part really engage with the concave part = the sheet, which is a simple gap filling method without damaging the female Page 36 442 8 1 2 Amend A method for manufacturing a cathode structure, comprising the steps of: uniformly mixing nickel powder, electron emitter powder and rare earth metal oxide powder; ~ sintering the mixed powder to form a cathode sheet; and inserting and fixing the cathode sheet At one end of the sleeve, the sleeve has a sealed end, and also has a recess formed on the end face of the seal, and a cathode sheet having a diameter smaller than the opening of the recess is inserted into the recess, and is mechanically maintained fixed. [26. The method according to the scope of application for patent No. 25, wherein after the cathode film machine is mechanically fixed in the recess, a part of the sleeve corresponding to the recess is filled from the outer periphery to the inner, to This cathode sheet was fixed to the recess. : 2 7 _ The method according to item 25 of the scope of patent application, wherein the height variation of the cathode sheet along the periphery of an i-end surface of the cathode sheet is within 10 microns. 1 I 28. The method according to item 25 of the patent application, wherein the recess is provided with a fixture to fix the cathode sheet on the inner peripheral surface. I * 29. The method according to item 25 of the patent application park, wherein the cathode sheet has a thickness made of one of Ni, Ti, Cr, Pt, Pd, Ta, and Nb on the end face of the insertion side of the cathode sheet | The film is 0.2 ± 0.1 micron. 3 0. The method according to item 25 of the scope of patent application, further comprising the step of welding the cathode sheet to the recess to fix them together. Page 37 442 8 Amend SE-ML13923 VI. Application for patent scope 3: If the method of applying for patent scope No. 30, "The welding includes resistance welding. 32. For the method of applying patent scope No. 30, its ten The welding includes laser splicing. 33.—A method for manufacturing a cathode structure, which includes the steps of: uniformly mixing a recording powder, an electron emitter powder, and a rare earth metal oxide powder; sintering the mixed powder to form a cathode Inserting and fixing the cathode sheet in the recess of the U-shaped cap; and bonding and fixing the bottom of the 5 cover I cover to a sealed end face of the sleeve, wherein the cap is made of nickel-chromium alloy and has a diameter smaller than that The cathode sheet opened in the concave part is inserted and mechanically maintained and fixed in the concave part. 34. The method according to item 33 of the patent application, wherein the 1] -shaped cap has a round convex part at the bottom, and the cathode The sheet is pressed under the pressure to form a cap and fixed by welding. 35. For example, the method of claim 33 in the scope of patent application, wherein the cathode sheet used is shaved in advance. method Wherein along the periphery of the end surface of a cathode of the cathode plate within months height mutation based 1〇 microns. 44 ^ 8ι 2 Amendment ^ S__88113923 VI. Application for patent scope 37. The method of applying for patent item No. 33, wherein the recess has a fixture '' to fix the cathode sheet on the inner peripheral surface. 38. The method according to item 33 of the patent application, wherein the cathode sheet has a thickness of 0.2 ± 〇 on one end face of the insertion side made of one of 'Ti, Cr, Pt, Pd, Ta, and Nb. . 1 micron film. The method of claim 33 includes the step of welding to the recess to fix the cymbals together. Resistance welding such as. The method of claim 30 in the patent scope, wherein the welding includes welding including laser 4: The method of claim 30 in the patent scope, wherein the welding.