JP2000268742A - Heater structure, cathode structure, electron gun structure and manufacture of the cathode structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To place a heater structure in a proper position in respect to a cathode substrate by a simple constitution and an operation means. SOLUTION: A heater structure 21 is provided with a heater 22 with a pair of legs, a heater tab 24 fixed to each leg, and a heater connector 25 which is supported by given support members 6 and to which the heater tabs 24 are fixed, and has a structure such that engaging members for positioning 26, 27 are formed on the heater tab 24 and the heater connector 25 respectively and the engaging members 26, 27 are engaged each other to position the heater 22. A cathode structure 1 is provided with the heater structure 21, a cathode substrate 1, a cathode sleeve 11 and the support members 6 supporting the heater connector 25 of the heater structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heater assembly, a cathode assembly using the heater assembly, an electron gun assembly using the cathode assembly, and a method of manufacturing a cathode assembly.

[0002]

2. Description of the Related Art A conventional electron gun assembly used for a cathode ray tube will be described with reference to FIGS. This description is for a single electron gun assembly. FIG. 6 shows a cathode assembly of the electron gun assembly, and FIG. 7 shows a heater assembly provided on the cathode assembly.

In FIG. 6, reference numeral 1 denotes a cathode structure, 2 denotes a cup-shaped first grid, 3 denotes a second grid, and 4 denotes a holding structure. These components are arranged inside an insulating glass body 5. The cathode structure 1 is held and fixed to the insulating glass body 5 by the holding structure 4, and the grids 2 and 3 are directly fixed to the insulating glass body 5.

The holding structure 4 is formed by integrally fixing a cylindrical outer holding member 4a made of an Fe--Ni alloy and a cylindrical inner holding member 4b made of an Fe--Co--Ni alloy with glass ceramics 4c. Then, both these members 4a
A pair of heater connector support members 6 located in the middle of 4b are integrally fixed. A heater connector 7 is fixed to the tip of the support member 6 by laser welding. The holding structure 4 is fitted and fixed inside the first grit 3.

For example, an impregnated type cathode structure is used. In FIG. 7, reference numeral 11 denotes a cathode sleeve made of tantalum and having both open ends, for example, having an outer diameter of 1.3 mm, a thickness of 20 microns, and a length of 5.0 mm. Cathode sleep 1
A cup 13 having a cathode base 12 made of tantalum is fitted to one end of the opening 1. The cathode substrate 12 is made of a porous tungsten having a porosity of about 20% in which an emitter composed of BaO, CaO and Al ₂ O ₃ at a molar ratio of 4: 1: 1 is melt-impregnated in a high-temperature hydrogen atmosphere or in a vacuum. And 1 r, Os-Ru
And the like.

The heater assembly 1 is provided inside the cathode sleeve 11.
5 are provided. The heater assembly 15 has a heater 16, a heater tab 18, and a heater connector 19. The heater 16 is a wire made of a rhenium-tungsten alloy formed in a coil shape. The surface of the heater 16 excluding its legs has a two-layer structure mainly composed of alumina formed by electrophoresis or spraying. A heat-resistant insulating coating layer 17 is formed. This heat-resistant insulating coating layer 17
Is formed by coating the surface of the heater 16 and then sintering in a high-temperature hydrogen furnace. The heater tab 18 is made of a pressed stainless steel plate, has a substantially rectangular frame shape, and has one surface fixed to a leg of the heater 16 by laser welding. In the figure, a indicates this welded portion. 10. Combined length of heater tab 18 and heater 16
5 mm. The cathode sleeve 11 is coaxially arranged inside a holding tube 14 made of an Fe—Co—Ni alloy, and fixed to the cathode sleeve 11 and the holding tube 14 by performing laser welding on three strip-shaped straps 7 made of tantalum. It is supported by The total length of the cathode assembly 1 including the cathode sleeve 11 and the holding cylinder 14 is about 5.5 mm.

The cathode assembly 1 is arranged so that one end of the cathode sleeve 11 is located on the inner holding member 4 b of the holding assembly 4, and passes through an electron beam passage hole provided in the first grit 3, using an air micro method, electrostatic capacity. The distance between the cathode base 12 and the first grit 2 is accurately set by a method such as a method, a laser method, or the like, and the inner holding member 4b of the holding structure 4
Is fixed by laser welding.

A method for incorporating the heater assembly 15 inside the cathode sleeve 11 will be described. After slowly inserting the heater assembly 15 from the open end of the other end of the cathode sleeve 11 and confirming that the tip of the heater 16 has contacted the cathode base holding cup 13 provided at the open end of the cathode sleeve 11, the heater connector The heater connector 19 attached to the supporting member 6 is fixed by performing laser welding. Thereafter, as shown in FIG. 7, the wafer is cut by a laser or a cutter along the line YY.

Although the above description has been given of the case of the impregnated cathode structure, the assembly of the heater structure is performed in exactly the same manner in the case of the oxide cathode structure.

[0010] The heater tab 18 used in this cathode assembly
The heater assembly 15 provided with the heater tub 15 can prevent the insulating coating layer 17 covering the surface of the heater 16 from being damaged.
The accuracy of the distance between the welding position of the heater 8 and the welding position of the leg of the heater 16 can be relatively easily obtained, so that the resistance of the heater 16 is stabilized, and as a result, the variation in the current flowing through the heater 16 can be reduced. There has been a lot of use for many years.

[0011]

However, the cathode structure thus constructed has the following problems.

That is, it is necessary to heat the cathode base 12 at a required operating temperature by the heater 16 in order to cause the cathode base 12 to emit necessary electrons. It is desirable to make light contact with the cup 13 fitted with. Therefore, when the heater 16 is inserted into the inside of the cathode sleeve 11 and the heater tab 18 is attached to the heater connector 19, the heater 16 is inserted at an appropriate position where the tip of the heater 16 comes into contact with the cup 13 provided on the cathode sleeve 11 without difficulty. It is necessary to arrange.

By the way, the power consumption of recent cathode ray tubes has been advanced, and the cathode structure 1 has been inevitably reduced in size. As a result, the inside diameter of the cathode sleeve 11 in the cathode assembly 1 is reduced, and the heater 16 inserted therein is also designed to have high thermal efficiency. In order to increase the thermal efficiency of the heater 16, the length of the coil portion (secondary coil portion) is shortened so that the coil portion (primary coil portion) of the heater 16 is concentrated on the upper end portion of the cathode sleeve 11, and the outer diameter is reduced. Designed to be large. Further, in the case of the impregnated type cathode structure, since the operating temperature is high, it is necessary to consider the withstand voltage characteristics between the heater 16 and the cathode base 12.
Becomes thicker. For these reasons, the space between the inner peripheral surface of the cathode sleeve 11 and the outer peripheral surface of the coil of the heater 16 becomes narrow, and it becomes difficult to insert the heater 16 into the inside of the cathode sleeve 11.

Further, the heater 16 employs a three-stage variable pitch type coil structure in order to concentrate more coil portions on the end of the cathode sleeve 11 provided with the cathode base. When the heater 16 is connected, since the parallel connection is used because the heat loss to the heater legs is smaller than that in the series connection, the wire diameter of the heater 16 must be reduced. For these reasons, the mechanical strength of the straight portion of the leg of the coil decreases.

For this reason, the heater 16 is connected to the cathode sleeve 11.
When the leg of the heater 16 collides with the cup 13 in an attempt to fully insert the heater into the inside of the heater, excessive force is applied to the linear portion of the heater leg, and the leg of the heater 16 is bent or the heater 1 is bent.
The insulating coating layer 17 of No. 6 causes a problem such as peeling. On the other hand, if the length of inserting the heater 16 into the cathode sleeve 11 is adjusted so that the tip of the heater 16 does not contact the cup 13,
A problem arises in that the operating temperature of the cathode substrate is lowered and the expected characteristics of the cathode ray tube cannot be obtained. Particularly in the case of an impregnated cathode assembly, since a slight excess or deficiency of the heater insertion size significantly affects the cathode operating temperature, careful management is required.

As described above, in the conventional heater structure, sufficient consideration has not been given to the structure used for the power saving type cathode structure. Therefore, it has been demanded that the heater assembly and the cathode assembly be arranged at a suitable position with respect to the cathode base by a simple configuration and operation means.

The present invention has been made in view of the above circumstances, and provides a heater assembly which can dispose a heater assembly at an appropriate position with respect to a cathode base by a simple configuration and operation means, and solves the conventional demand. The purpose is to do.

An object of the present invention is to provide a cathode structure provided with the heater structure.

An object of the present invention is to provide an electron gun assembly provided with the heater assembly.

An object of the present invention is to provide a manufacturing method for manufacturing the cathode assembly.

[0021]

According to a first aspect of the present invention, there is provided a heater assembly having a heater having a pair of legs, a heater tab fixed to each leg of the heater, and a predetermined support member. A heater connector that is supported and to which the heater tab is fixed; a heater positioning engagement portion is formed on each of the heater tab and the heater connector, and the engagement portions are engaged with each other. .

According to the structure of the present invention, the positioning engagement portions formed on the heater tab and the heater connector are engaged with each other and fixed to each other, so that the heater can be inserted into the cathode sleeve with respect to the cathode base when the heater is inserted into the cathode sleeve. The positioning can be easily and reliably performed so as to be located at an appropriate position, and it is possible to suppress the occurrence of troubles when the heater is excessively inserted into the cathode sleeve and when the heater is insufficiently inserted into the cathode sleeve. it can.

According to a second aspect of the present invention, in the heater structure according to the first aspect, the engaging portion formed on the heater tab is a concave portion, and the engaging portion formed on the heater connector is engaged with the concave portion. It is characterized by being a protruding portion.

According to a third aspect of the present invention, in the heater structure according to the first aspect, the engaging portion formed on the heater tab is a protrusion, and the engaging portion formed on the heater connector is formed on the protrusion. It is characterized by a concave portion to be engaged.

According to the second and third aspects of the invention,
The positioning engagement portions formed on the heater tab and the heater connector can be provided in a specific and appropriate form.

A cathode structure according to a fourth aspect of the present invention comprises a cathode base, a cathode sleeve having both ends opened and the cathode base fixed to one end opening part, and the heater being inserted from the other end opening part of the cathode sleeve into the inside thereof. 4. A heater assembly according to claim 1, wherein the heater assembly is inserted and a tip of the heater is provided in contact with the cathode base, and a support member for supporting the heater connector of the heater assembly. It is characterized by.

According to the structure of the present invention, there is provided a cathode assembly provided with a heater assembly which suppresses the occurrence of problems when the heater is excessively inserted into the cathode sleeve and when the heater is insufficiently inserted into the cathode sleeve. it can.

According to the fifth aspect of the present invention, there is provided an electron gun assembly.
And a grid.

According to the configuration of the present invention, an electron gun assembly having a heater assembly which suppresses the occurrence of a problem when the heater is excessively inserted into the cathode sleeve and when the heater is insufficiently inserted into the cathode sleeve is suppressed. Can be provided.

According to a sixth aspect of the present invention, in the electron gun assembly of the fifth aspect, the heater connector supporting member provided on the cathode assembly holds the heater assembly on an insulating glass body surrounding the electron gun assembly. It is characterized by being fixed to a structure.

According to a seventh aspect of the present invention, in the electron gun assembly according to the fifth aspect, the heater connector support member provided on the cathode assembly is fixed to an insulating glass body surrounding the electron gun assembly. Characterized in that:

According to the sixth and seventh aspects of the invention,
A structure for holding the heater connector support member provided on the cathode assembly can be provided in an appropriate and specific form.

[0033] The method for manufacturing a cathode structure according to claim 8 is as follows.
A cathode sleeve having a cathode base fixed to one end open portion is arranged, and a heater connector having a heater positioning engagement portion is positioned and fixed to a predetermined support member, and then a heater having a pair of legs and The heater in a structure consisting of a heater tab fixed to each leg of the heater and forming a heater positioning engagement portion is inserted into the cathode sleeve from the other end opening portion of the cathode sleeve, and the heater tab is used for positioning the heater tab. An engaging portion is engaged with a heater positioning engaging portion of the heater connector, and thereafter, the heater tab and the heater connector are fixed to each other.

According to the structure of the present invention, the cathode structure of the fourth aspect can be manufactured by an appropriate method.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing an electron gun structure of this embodiment, FIG. 2 is a front view showing a cathode structure, and FIG. 3 is a cross-sectional view taken along line ZZ in FIG. 2 showing an engagement portion between a heater tab and a heater connector. FIG.

The other components of the electron gun assembly of this embodiment except for the heater assembly are the same as those of the conventional electron gun assembly shown in FIG. 6 and described above. That is, in the figure, 1 is a cathode structure, 2 and 3 are grids, 4 is a holding structure, 5 is an insulating glass body, 6 is a supporting member, and 7 is a strap for holding a cathode sleeve. 11 is a cathode sleeve, 12 is a cathode base, 13 is a cup, and 14 is a holding cylinder.

The heater structure of the present invention will be described with reference to FIG. In FIG. 2, reference numeral 21 denotes a heater structure. The heater structure 21 includes a heater 22 having an insulating coating layer 23,
It has a heater tab 24 and a heater connector 25. The heater 22 forms a wire (fast coil) of a wire of rhenium and a tungsten alloy, and further forms the coil with a central coil portion 22a and a pair of intermediate portions sandwiching the coil portion 22a as shown in FIG. 22b
And a leg 22c in a straight line at both ends continuous with the intermediate portion 22b, and a pair of the intermediate portion 22b and the legs 22c at both ends are bent around the coil portion 22a so as to overlap each other. ing.

The center coil portion 22a and the intermediate portion 22b of the heater 22 are provided with an insulating coating layer 2 having heat resistance.
3 are coated. This insulating coating layer 23 is
2 is a heat-resistant inner insulating coating layer mainly composed of alumina and directly covers the surface of the second insulating layer, and a heat-resistant outer insulating layer is formed by adding a heat-resistant metal powder of alumina formed on the outer surface of the inner insulating coating layer. It consists of two coating layers.

The heater tab 24 is formed in a rectangular frame made of, for example, a stainless steel plate, and a predetermined side portion is formed with a slit 24a extending outside and inside. On one surface of the heater tab 24, both ends 22c of the heater 22 are in contact at a pair of edge portions sandwiching the slit 24a,
Laser welding is performed on the other surface of the heater 22 opposite to the contact surface with the heater leg to fix both ends 22 c of the heater 22. In the figure, a indicates this welded portion. here,
This is one form of a heater positioning engagement portion at a location near the weld fixing portion of the heater tab 24 to the both ends 22 c of the heater 22, specifically, at a pair of edge portions sandwiching the slit 24 a in the heater tab 24. Engagement groove 26
(Engagement concave portions) are respectively formed.

The pair of engagement grooves 26 are formed in the heater tab 2.
4 penetrates between one surface and the other surface, and has a rectangular shape formed along a direction perpendicular to the heater length direction and opened by the slit 24a. When the heater 22 is inserted into the inside of the cathode sleeve 11 and the heater tab 24 is fixed to the heater connector 25 as will be described later, the engagement groove 26 is provided in the cup 13 with the tip of the heater 23 provided in the cathode sleeve 11. Is positioned so that it can be inserted and arranged at an appropriate position with respect to. The combined length of the heater 22 and the heater tub 24 is 7.7 mm
It is.

The heater connector 25 is formed of, for example, a stainless steel plate. The heater connector 25 is disposed at a position overlapping with the heater tab 24 in the heater structure 15, abuts on the distal ends (lower ends) of the pair of support members 6 attached to the holding structure 4, and is formed by laser welding. It is stuck to. As shown in FIGS. 2 and 3, a pair of engagement grooves 2 formed on the heater tab 24 is formed on a surface of the heater connector 25 that contacts the heater tab 24.
An engagement protrusion 27, which is one form of the heater positioning engagement portion, is formed at a position opposing the heater protrusion 6 respectively.

The pair of engaging projections 27 are
And has the same size as the engagement groove 26 and the same height as the plate thickness of the heater tab 24. When the heater 22 is inserted into the inside of the cathode sleeve 11 and the heater tab 24 is fixed to the heater connector 25, the engagement protrusion 27 is used to connect the heater 22 to the cup 13 having the tip provided on the cathode sleeve 11. It is positioned so that it can be inserted and arranged at an appropriate position.

The heater 22 is inserted and disposed inside the cathode sleeve 11 with the coil portion 22a as a tip, and both end legs 22c protrude from the other end opening of the cathode sleeve 11 to the outside. The side of the heater tab 24 where the slit 24 a is formed is in contact with the heater connector 25, and a pair of engagement grooves 26 formed in the heater tab 24 and the engagement protrusion 2 formed in the heater connector 25.
7 are engaged with each other. Therefore, the heater tub 24
Is fixed, the tip of which is the cathode sleeve 11
Is positioned at an appropriate position for lightly contacting the cup 13 provided at the position (appropriate position for the cathode base 12 supported by the cup 13).

The heater tab 24 and the heater connector 2
The parts 5 that are in contact with each other are fixed by laser welding. Thus, the heater 22 is held by the insulating glass body 5 via the heater tab 24, the heater connector 25, the support member 6, and the holding structure 4. That is, the heater 22 is positioned at an appropriate position where the cathode base 12 can be heated at a predetermined operating temperature, and is held by the insulating glass body 5.

A method for manufacturing the heater assembly 21 will be described. The heater 22 is manufactured as described below. Using a primary coil as a core wire, a mandrel wire made of molybdenum is used so that a portion to be the coil portion 22a is in a fine pitch, a portion to be the intermediate portion 22b is a coarse bitch, and a portion to be the leg portion 22c is an intermediate bitch. And coiling. In this case, the bitch ratio is set to 22a: 22b: 22c = 100: 3.
0:60 and a three-stage variable bitch. A secondary coil, which is the heater 22, is formed using the primary coil. Next, a heat-resistant internal insulating coating layer containing alumina as a main component is formed on the whole of the formed heater 22 except for a welded portion of the leg portion 22c by a spray method, and a heat-resistant metal powder is applied to alumina on the surface of the insulating image. The added heat-resistant outer insulating coating layer is formed to obtain a double-layered insulating layer 23. The inner insulating coating layer has a thickness of 0.10 mm, and the outer insulating coating layer has a thickness of 0.02 mm. After forming the heat-resistant insulating coating layer, sintering is performed in a high-temperature hydrogen furnace. Further, the mandrel wire of the primary coil in the heater 22 is removed by dissolving with a mixed acid.
Next, the heater tab 24 formed by pressing is fixed to the leg 22c of the heater 22 by laser welding. At this time, the position between the tip of the coil portion 22a of the heater 22 and the welding point is set so as to obtain a predetermined resistance.

A method for incorporating the heater 22 into the cathode sleeve 11 will be described. Heater 22 to cathode sleeve 11
Of the heater tab 2
4 is inserted until the engagement groove 26 formed on the support member 6 engages with the engagement protrusion 27 of the heater connector 25 attached to the support member 6. When the engagement groove 26 of the heater tab 24 engages with the engagement protrusion 27 of the heater connector 25, the insertion operation of the heater 22 is stopped, and the tip of the coil portion 22a of the heater 22 is provided at one end opening of the cathode sleeve 11. The cathode base 12 is lightly contacted with the cup 13 and is held at an appropriate position where the cathode base 12 can be heated at a predetermined operating temperature. Further, the heater tab 24 and the heater connector 25 are fixed by laser welding. Finally, the heater tub 22 is cut by a laser along the line YY in FIG. The combined length of the heater 22 and the heater tab 24 after cutting is set to be 7.7 mm or less.

Then, the cathode sleeve 11 and the cathode base 1
2, a heater assembly 21 including a heater 22, a heater tab 24, and a heater connector 25;
And the cathode structure 1 are configured.
An electron gun assembly is configured by combining the cathode assembly 1, the grids 2, 3, the holding assembly 4, and the insulating glass body 5.

By the way, it is necessary to heat the cathode base 12 at a required operating temperature by the heater 22 in order to cause the cathode base 12 to emit necessary electrons. Is required to be positioned at an appropriate position with respect to the cup 13 fitted. In this embodiment, when the heater 22 is inserted into the inside of the cathode sleeve 11, the engagement groove 26 of the heater tab 24 and the engagement protrusion 27 of the heater connector 25 are engaged, and the heater 2
The heater 22 can be held at an appropriate position where the tip of the base member 2 can lightly contact the cup 13 provided on the cathode sleeve 11 to heat the cathode base 12 at a predetermined operating temperature.

For this reason, the heater 22 is connected to the cathode sleeve 11.
When the heater 22 is inserted into the cup 22, it is possible to suppress the occurrence of a problem that the leg 22c of the heater 22 is bent or the insulating coating layer 23 is peeled off from the heater 22 due to excessive force being applied by the heater 22 strongly against the cup 13. In addition, it is possible to suppress the occurrence of problems such as a decrease in the cathode operating temperature caused by insufficient insertion of the heater 22 into the cathode sleeve 22 and the accompanying deterioration of the electron emission characteristics. Therefore, by using the heater assembly and the cathode assembly, a cathode ray tube having high reliability and excellent mass productivity can be obtained.

Further, since the combined length of the heater tab 24 and the heater 22 is reduced to 7.7 mm, the capacitance between the cathode base 12 and the heater 22 can be reduced by 30% as compared with the conventional case. This reduction in capacitance has made it possible to mount the electron gun structure on a high-definition cathode ray tube that can handle ultra-high frequencies.

The present invention is not limited to the above-described embodiment, but can be implemented with various modifications. For example, the engaging portion formed on the heater tab 24 and the engaging portion formed on the heater connector 25 are not reduced to the embodiment. FIG.
Formed an engaging projection 28 on the contact surface of the heater tab 24 with the heater connector 25, and formed an engaging recess 29 on the contact surface of the heater connector 25 with the heater tab 24 to engage with the engaging projection 28. Things. Also in this configuration, the heater 22 can be positioned at an appropriate position. 4, the same parts as those in FIG. 3 are denoted by the same reference numerals. Further, the shape of the engaging portion is not specified.

Further, in the above-described embodiment, the support member 6 for supporting the heater connector 25 is attached to the holding structure 4, but the structure for attaching the support member 6 is not limited to this mode. For example, as shown in FIG. It is also possible to attach the support member 6 to the insulating glass body 5. With this configuration, the heater connector 25 can be supported via the support member 6. 5, the same parts as those in FIG. 1 are denoted by the same reference numerals.

In the above-described embodiment, the cathode structure using the impregnated cathode base has been described. However, the present invention is not limited to this, and a cathode structure using an oxide cathode base can also be used. Further, the present invention can be applied not only to a single electron gun structure but also to a case where a plurality of electron gun structures are provided.

[0054]

According to the heater structure of the first aspect of the present invention,
By engaging the heater positioning engagement portions formed on the heater tab and the heater connector and fixing them together, the heater can be easily and appropriately positioned with respect to the cathode base when the heater is inserted into the cathode sleeve. Positioning can be performed reliably, and therefore, when the heater is excessively inserted into the cathode sleeve, a problem such as bending of the heater leg or peeling of the insulating coating layer in the heater occurs, and when the heater is insufficiently inserted into the cathode sleeve. In this case, it is possible to suppress the occurrence of a problem that the operating temperature of the cathode substrate is lowered.

According to the second and third aspects of the present invention,
In the heater assembly according to the first aspect, the heater positioning engagement portions formed on the heater tab and the heater connector can be provided in a specific and appropriate form.

According to the cathode structure of the fourth aspect of the present invention,
Heater assembly that can easily and surely be positioned so as to be positioned at an appropriate position with respect to the cathode base when inserting the heater into the cathode sleeve, and suppresses the occurrence of problems due to excessive insertion and insufficient insertion of the heater into the cathode sleeve. Can be obtained.

According to the electron gun assembly of the fifth aspect, when the heater is inserted into the cathode sleeve, the heater can be easily and reliably positioned so as to be located at an appropriate position with respect to the cathode base. It is possible to obtain an electron gun assembly including a heater assembly in which the occurrence of problems due to excessive insertion and insufficient insertion of the heater into the sleeve is suppressed.

According to the sixth and seventh aspects of the invention,
In the electron gun assembly according to the fifth aspect, a structure for holding the heater connector support member provided on the cathode assembly can be obtained in an appropriate and specific form.

According to the method for manufacturing a cathode structure according to the eighth aspect, the cathode structure according to the fourth aspect can be manufactured by an appropriate method.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electron gun assembly including a heater assembly and a cathode assembly according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a heater assembly and a cathode assembly according to the embodiment;

FIG. 3 is an enlarged cross-sectional view showing a fixing portion between the heater tab and the heater connector in the heater structure according to the embodiment;

FIG. 4 is an enlarged sectional view showing a fixing portion between a heater tab and a heater connector in a heater assembly according to a second embodiment;

FIG. 5 is a sectional view showing an electron gun assembly according to a third embodiment.

FIG. 6 is a cross-sectional view showing an electron gun structure according to a conventional mode.

FIG. 7 is a cross-sectional view showing a heater assembly and a cathode assembly provided in the electron gun assembly in the conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cathode structure, 2 ... Grid, 3 ... Grid, 4 ... Holding structure, 5 ... Insulating glass body, 6 ... Support member, 11 ... Sleeve, 12 ... Cathode base, 13 ... Cup, 14 ... Holding cylinder, 21 ... Heater Structure: 22: heater, 23: insulating coating layer, 24: heater tab, 25: heater connector, 26: engagement hole (engagement part), 27: engagement projection (engagement part), 28: engagement projection Part (engaging part), 29 ... engaging concave part (engaging part).

Continued on the front page (72) Inventor Eiichiro Uda 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture F-term in Toshiba Yokohama Office (reference) 3K092 PP20 QA04 QB02 QB27 QC42 QC43 QC44 QC54 QC63 VV02 5C027 DD13 5C031 DD05 DD19 DD19 5C041 AB02 AB03 AC48

Claims (8)

[Claims] 1. A heater having a pair of legs, a heater tab fixed to each leg of the heater, and a heater connector positioned and supported on a predetermined support member and to which the heater tab is fixed. A heater assembly, wherein a heater positioning engaging portion is formed on each of the heater tab and the heater connector, and the engaging portions are engaged with each other. 2. An engaging portion formed on the heater tab is a concave portion, and an engaging portion formed on the heater connector is a protrusion engaging with the concave portion.
4. The heater structure according to claim 1. 3. An engagement portion formed on the heater tab is a projection, and an engagement portion formed on the heater connector is a concave portion engaged with the projection.
4. The heater structure according to claim 1. 4. A cathode base, a cathode sleeve having both ends opened and a cathode base fixed to one end opening part, and the heater inserted into the cathode sleeve from the other end opening part so that a tip of the heater is formed. The heater structure according to any one of claims 1 to 3, which is provided in contact with the cathode base,
And a supporting member for supporting the heater connector of the heater assembly. 5. An electron gun assembly comprising: the cathode assembly according to claim 4; and a grid. 6. The heater connector supporting member provided on the cathode assembly is fixed to a holding assembly for holding the heater assembly on an insulating glass body surrounding the electron gun assembly. 3. The electron gun assembly according to claim 1. 7. The electron gun according to claim 5, wherein the heater connector support member provided on the cathode assembly fixes the heater assembly to an insulating glass body surrounding the electron gun assembly. Structure. 8. A cathode sleeve having a cathode base fixed to one end open portion, a heater connector having a heater positioning engagement portion positioned and fixed to a predetermined support member, and then a pair of leg portions The heater in a structure comprising a heater having a heater tab and a heater tab fixed to each leg of the heater and forming a heater positioning engaging portion, is inserted into the cathode sleeve from the other end opening portion thereof, A method for manufacturing a cathode assembly, comprising: engaging a heater positioning engagement portion of a heater tab with a heater positioning engagement portion of the heater connector; and thereafter fixing the heater tab and the heater connector to each other.