JP2000260322A - Manufacture of electricity guide for lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently hold a lead bar in a tilting function material by pressurizing, molding, and sintering a powder laminate where mixtures having different contents of conductive inorganic components are sequentially charged into a molding die holding the lead bar. SOLUTION: An insulating inorganic powder is charged around a lead bar 13 in a molding die 10 to form a layer, and a plurality of mixing powders, where conductive inorganic powders and insulating inorganic powders are mixed at a different ratio and contents of the conductive inorganic powders are different, are charged and pressurized in the order from the lowest content of the conductive inorganic powders to provide a layered powder laminate 14. This is pressurized with upper and lower pressurizing members 16, 11 to become the layered powder laminate 14. The powder laminate 14, in which a part of the lead bar 13 is buried, is removed from the molding die 10, is heated under non-oxidizing gas atmosphere to be a temporarily sintered body, and is fully sintered in non-oxidizing gas or reduced pressure atmosphere at temperature higher than that during the temporary sintering process to become a tilting function material. Thus, the lead bar 13 is air-tightly joined with shrinkage fitting and is integrally fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a lamp electric introducer for sealing a vessel of a lamp such as a discharge lamp or an incandescent lamp.

[0002]

2. Description of the Related Art A functionally graded material is composed of, for example, a mixed sintered body of a conductive inorganic material component composed of a metal and an insulating inorganic material component composed of a metal oxide. The conductive portion having a high content of the conductive inorganic material component and the insulating content having a low content ratio of the conductive inorganic material component of zero or a low content ratio due to a gradient or stepwise change in the content ratio of the material component. The portion is an integral solid material located at different locations and is suitably used, for example, in a configuration of a seal portion of a lamp as an electric introducing body forming a current supply path.

Conventionally, as a method for producing such a functionally gradient material, a so-called dry method has been advantageously used. In this dry method, for example, by mixing a conductive inorganic material powder made of, for example, molybdenum and an insulating inorganic material powder made of, for example, silica at different ratios, a plurality of mixed powders having different conductive inorganic material powder content ratios Is prepared, and usually, first, only the insulating inorganic material powder not containing the conductive inorganic material powder is filled using gravity to form an insulating inorganic material layer in the molding die. To
The mixed powder having the lowest content ratio of the conductive inorganic material powder is filled in layers in order, thereby forming a plurality of mixed powder layers to form a powder laminate. The powder laminate obtained in this manner is subjected to pressure molding, and the resulting molded laminate is heated and fired to form an integral sintered body, whereby the content ratio of the conductive inorganic material powder is uniform in each case. A functionally graded material is manufactured by laminating a plurality of constituent layers having the following structure so that the content ratio of the conductive inorganic substance powder gradually increases stepwise from bottom to top.

[0004] In order to use such a functionally graded material as an electric conductor for a lamp, it is necessary to connect a lead bar to the functionally graded material in a state of being hermetically bonded. In order to achieve this, conventionally, as shown in FIG. 7, a temporary sintered body 40 obtained by temporarily sintering a powder laminate is provided with one end face having a conductive inorganic substance component content of zero or small. (A lower end face in the figure) an internal lead rod insertion hole 41 extending from 40A in the stacking direction (upward in the figure);
External lead rod insertion holes 42 extending in the stacking direction from the other end surface 40B having a large content ratio of the conductive inorganic material component are formed, for example, by cutting, and as shown in FIG. 8, these insertion holes 41, 42 are formed. The base ends of the internal lead rod 43 and the external lead rod 44 are inserted into the inside, and the composite obtained here is subjected to the main sintering process. A method has been used for producing a lamp electric introducer that protrudes from a functionally gradient material 46 made of a sintered body obtained from the above and whose respective base ends are air-tightly fixed and held integrally. Reference numeral 48 denotes an electrode coil provided at the tip of the internal lead rod 43. This lamp electric introducer is used for manufacturing a discharge lamp.

[0005] However, the above-mentioned method is considerably disadvantageous in production in that a cutting step for forming a hole in the pre-sintered body is required. Therefore, inside the molding die for forming the powder laminate, a rod-shaped molding auxiliary member for forming a hole is provided in advance, and the material powder is pressure-molded using the mold, A method for producing a molded laminate having a lead rod insertion hole has been proposed.

However, in the lamp electric lead body obtained by such a method, a step of inserting a lead rod into a molded laminate having a lead rod insertion hole is required, and impurities are contained in the lead rod insertion hole. May get in,
Further, in the present sintering process, the lead rod cannot always be sufficiently joined to the functionally gradient material in a gas-tight manner, and the lead rod has insufficient holding force in the sealing member made of the functionally graded material, so that the lead rod is not sufficiently bonded. May fall off.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made based on the above circumstances, and its object is to provide:
Provided is a method for manufacturing a lamp electric guide body in which a lead rod is held by a functionally graded material made of a sintered body with a sufficient holding force, whereby a lamp electric guide body can be advantageously manufactured by a very simple process. Is to do.

[0008]

According to the present invention, there is provided a method for manufacturing a lamp electric lead body, comprising: a step of forming a conductive inorganic substance component and an insulating inorganic substance in a molding die holding a lead rod so as to protrude inside; Prepared by mixing the components at a predetermined ratio, by sequentially filling a plurality of mixtures having a different content ratio of the conductive inorganic material component, the content ratio of the conductive inorganic material component in one direction. By pressing and molding a powder laminate obtained by laminating a plurality of changing mixture layers, and sintering the obtained molded laminate in which a part of the lead rod is embedded, the lead rod is formed. The invention is characterized in that a lamp electric introducing body is hermetically fixed to a functionally gradient material made of a sintered body and held integrally.

[0009] In the above, the lead rod may have a deformed portion formed of a concave portion or a convex portion formed on the outer peripheral surface of the portion located in the molded laminate.

Further, according to the method of the present invention for producing a lamp electric guide, the molding die has a lower pressing member in which a lead rod is held so as to protrude upward, and the lead rod penetrates vertically. It is carried out in a mode in which a powder laminate is formed, or, the molding die, while one lead rod is held so as to protrude upward in the lower pressing member,
The upper pressing member holds the other lead rod so as to protrude downward, and is carried out in a mode in which a molded laminate is formed in a state in which the upper end of one lead rod and the lower end of the other lead rod are buried. You.

[0011]

According to the manufacturing method of the lamp electric guide of the present invention, in the pressure forming step for manufacturing the functionally graded material, the formed laminate to be formed is a state in which a part of the lead rod is buried. By sintering this,
An electric lead body for a lamp is obtained in which the lead rod is air-tightly fixed to the functionally graded material made of a sintered body and held integrally, so that it is not necessary to perform cutting work on the pre-sintered body and insert the lead rod. There is no need to insert a lead rod into the hole.

Further, there is no step of fixing the lead rod using the hole formed in the pre-sintered body which is a precursor of the functionally graded material, and the lead rod is buried from the time of forming the powder laminate. Therefore, the shape of the embedded portion of the lead rod does not need to be linear, and therefore, a deformed portion can be formed in advance on the outer peripheral surface of the lead rod, and the deformed portion can be embedded. As a result, the lead rod can be held by the functionally graded material with a sufficient holding force due to the deformed portion, and a lamp electricity introducing body having high airtightness and a sufficient electrical connection state is manufactured. be able to.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory cross-sectional view showing an embodiment of the method for producing a lamp electric introducer of the present invention. In this example, reference numeral 10 denotes a molding die having a cylindrical molding space, and a lower pressurizing member 11 which is a bottom element of the molding die 10 has a gap extending upward from a central portion of the upper surface thereof. The forming sleeve member 12 is formed integrally. The upper end portion of the sleeve member 12 is pointed. A lead rod 13 made of, for example, a tungsten rod having a relatively large length is inserted into the hole of the sleeve member 12, whereby the lead rod 13 is disposed so as to protrude upward into the molding space.

The above-mentioned molding die 10 is filled with an insulating inorganic material powder made of, for example, silica from the upper opening to form an insulating inorganic material powder layer, and then a conductive material made of, for example, molybdenum is formed. Prepared by mixing the conductive inorganic material powder and the insulating inorganic material powder made of, for example, silica at different ratios, a plurality of mixed powders having different content ratios of the conductive inorganic material powder, containing the conductive inorganic material powder The mixed powder in which the content ratio of the conductive inorganic material powder increases upward as the mixed powder is filled into the molding die 10 in the form of a layer in the order from the smallest ratio and is pressed as necessary to form a layered body. A powder laminate 14 formed by laminating a plurality of powder layers is formed.

The powder laminate 14 in this state has its lower end portion defined by the upper surface of the lower pressurizing member 11, the outer peripheral surface of the sleeve member 12, and the inner peripheral surface of the molding die 10. The region above the upper end of 12 is defined by the outer peripheral surface of the lead rod 13 and the inner peripheral surface of the molding die 10. The lead rod 13 in this example has a large length, and its upper end protrudes further upward from the upper surface of the powder laminate 14. 14
It is in a more protruding state. Therefore, the lead rod 13
Is a state in which the conductive layer has a high content of the conductive inorganic substance powder with respect to the powder laminate 14.

In such a state, the lead rod 13 relatively enters the upper pressurizing member 16 into the through hole 15 having a diameter compatible with the outer diameter of the lead rod 13 formed so as to extend vertically. Then, the lower surface is brought into contact with the upper surface of the powder laminate 14, and the lower pressurizing member 11 and the upper pressurizing member 16 are pressed in the approaching direction to pressurize the powder laminate 14. Thus, a molded laminate is formed.

The molded laminate in which a part of the lead rod 13 is buried is thus obtained.
After being taken out of the substrate, it is subjected to a sintered body forming step. In this sintered body forming step, first, the molded laminate is temporarily sintered. That is, the molded laminate is subjected to a heat treatment at a maximum heating temperature of, for example, 1000 to 1200 ° C. in, for example, a non-oxidizing gas atmosphere to be a temporary sintered body. Next, the electric induction body material obtained here is heated at a temperature higher than the temperature in the above-mentioned temporary sintering step, so that the main sintering is performed. This main sintering process is performed, for example, in a non-oxidizing gas atmosphere or a reduced pressure atmosphere of, for example, 10 ⁻³ Pa or less, and the heating is performed, for example, under the condition that the maximum temperature is, for example, 1500 to 2000 ° C.

As a result, the pre-sintered body of the electroinductor material is finally made into a functionally gradient material made of a sintered body,
As shown in FIG. 2, the lead member 13 is hermetically bonded to the sealing member 21 made of the functionally graded material by a so-called shrink fit, and is integrally fixed, thereby producing the lamp electricity introducing body 20. Is done. The lamp electricity introducing body 20 is of a lead-rod penetrating type in which the lead rod 13 passes through the sealing member 21.

In the lamp electric introducing body 20,
The sealing member 21 is in a state where the content ratio of the conductive inorganic substance powder increases in a graded or stepwise manner in one specific direction (upward in the figure). In this example, the valve welding region A where the content ratio of the conductive inorganic material powder is zero or low is located at the bottom of the figure, and the content ratio of the conductive inorganic material powder increases upward, and the intermediate regions B and An airtight junction region C having high conductivity is formed.

In an area other than the hermetic joint area C of the sealing member 21, the outer peripheral surface of the lead rod 13 is not in direct contact with the sealing member 21, but corresponds to the shape of the sleeve member 12 between them. A gap S is formed. The formation of such a gap S prevents occurrence of cracks in the sealing member 21 due to a difference in thermal expansion coefficient with the lead rod 13. Then, in the hermetic joining region C of the sealing member 21, the outer peripheral surface of the lead rod 13 is joined to the sealing member 21 in an airtight manner.
Are fixed to and held by the sealing member 21.

Here, in the hermetic joint region C of the sealing member 21, the portion where the lead rod 13 penetrates has a conductive inorganic material component content of 75% by weight or more, It is preferable that the difference in the expansion coefficient is 1.0 × 10 ⁻⁷ [/ K] or less, whereby the sealing member 2
In 1, the occurrence of cracks due to the difference in the coefficient of thermal expansion can be prevented.

Specific examples of materials suitably used as the insulating inorganic substance powder include silica glass, quartz (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₂ ), and magnesia (MgO). , Silicon carbide (SiC), titanium carbide (TiC), silicon nitride (Si ₃ N ₄ ), aluminum oxynitride (AlON), and the like. Further, specific examples of the material suitably used as the conductive inorganic material powder include, for example, molybdenum,
Examples include nickel, tungsten, tantalum, chromium, platinum, and zinc. The above-mentioned conductive inorganic substance powder and insulating inorganic substance powder need to have high purity, and for example, those having a purity of 99.9% or more are preferably used. The average particle size of the conductive inorganic material powder and the insulating inorganic material powder is 0.01 to 10.0 μm,
In particular, the thickness is preferably 0.1 to 5.0 μm.

FIG. 3 is a cross-sectional view for explaining another embodiment of the method of manufacturing the lamp electric guide of the present invention. In this example, the lamp electrical introducer is suitably used for producing a discharge lamp such as a mercury lamp and a metal halide lamp.

In this example, a lower pressure member 11 of a molding die 10 having a cylindrical molding space is formed with a lead rod holding hole 11a so as to open on the upper surface. Then, one end of the lead rod 13 on which the sleeve-shaped metal member 24 is mounted in advance on the outer periphery is connected to the lead rod holding hole 11a.
The lead rod 13 projects upward in the molding space by being inserted into the
Are held on the lower pressing member 11.

Then, a powder laminate 14 is formed in the same manner as in the example of FIG. 1, pressed and molded, and then subjected to a sintering process, as shown in FIG. The lead rod 13 is hermetically joined by so-called shrink fitting in the hermetic joining area C of the stop member 21, and is fixed and integrally joined. In the valve welding area A and the intermediate area B of the sealing member 21, the lead rod 13 is provided. Thus, a lamp electric introducing body 25 having a configuration in which a sleeve-shaped metal member 24 is interposed between the lamp 13 and the lamp 13 is manufactured. Then, an electrode coil (not shown) made of, for example, a tungsten wire is provided at a tip of a portion of the lead bar 13 protruding, for example, on the side of the valve welding region A of the sealing member 21 to form a discharge electrode. .

In the above description, the material of the sleeve-shaped metal member 24 is preferably a high-melting-point metal material which is more malleable or ductile than the metal (for example, tungsten) forming the lead rod 13. It is preferable to use molybdenum or an alloy of molybdenum such as a molybdenum-palladium alloy or a molybdenum-platinum alloy. The sleeve-shaped metal member 24 may be mounted by simply press-fitting the lead bar 13, but may be spot-welded after the lead bar 13 is inserted into the sleeve-shaped metal member 24, for example.

In the lamp electrical lead-in body 25 manufactured in this example, the sleeve-shaped metal member 24 is interposed between the sealing member 21 and the lead rod 13 so that
In the intermediate region B and the valve welding region A in the sealing member 21, the occurrence of cracks due to the difference in the coefficient of thermal expansion with the lead rod 13 is prevented. Further, the lamp electricity introducing body 25 has an advantage that in a discharge lamp manufactured using the same, the phenomenon in which the enclosed mercury enters the gap along the outer peripheral surface of the lead rod 13 and is condensed is prevented. Is obtained.

FIG. 5 is an explanatory sectional view showing still another embodiment of the method of manufacturing a lamp electric introduction body according to the present invention. In this example, the lower pressing member 11 of the molding die 10 is used.
1, a sleeve member 12 similar to that in the example of FIG. 1 is provided. In this sleeve member 12, an internal lead rod 28A having a relatively small length is inserted and arranged. Then, in the same manner as in the above example, the powder laminate 14
Forming the sleeve member 12 of the inner lead rod 28A.
The upper end portion protruding from is completely buried in the powder laminate 14.

On the other hand, the upper pressing member 16, which is an upper element of the molding die 10, is provided with an external lead rod insertion hole 16a which is opened at the center of the lower surface thereof. By inserting one end of an external lead rod 28B made of, for example, tungsten into the hole 16a, the external lead rod 28B is inserted into the upper pressing member 16A.
It is held in a state of protruding downward.

The upper pressing member 16 is lowered until the lower surface of the upper pressing member 16 contacts the upper surface of the powder laminate 14, whereby the lower end portion of the external lead rod 28 B protrudes into the uppermost portion of the powder laminate 14. Let it. Then, the lower pressing member 11 and the upper pressing member 16 are further pressed in the approaching direction to press the powder laminate 14, thereby forming a molded laminate.

The thus obtained molded laminate in which the external lead rod 28B protruding from the upper end face and the internal lead rod 28A protruding from the lower end side are combined is subjected to a sintering process. Thereby, the base ends of the inner lead bar 28A and the outer lead bar 28B are integrally fixed and joined to the sealing member made of the functionally graded material in the hermetic joining region of the sealing member. A lamp electrical introducer is manufactured. In this lamp electric lead body, the inner lead rod 28A and the outer lead rod 28B are not continuous with each other, but are electrically connected to each other because the portion of the sealing member where their ends are located is conductive. It is in the state of being connected.

According to the above manufacturing method, the inner lead rod 2
8A and the external lead rod 28B can both be combined with the powder laminate 14 in the same pressing step, so that a lead rod non-penetrating lamp electrical introducer can be manufactured in a very simple process. .

In each of the above examples, the lead rod, the inner lead rod, and the outer lead rod connected to the sealing member have been described as being made of ordinary metal rods having a single outer diameter. However, in the present invention, the lead rod is not limited to such a normal metal rod.

FIG. 6 is an explanatory cross-sectional view showing a method of manufacturing a lamp electricity guide according to the present invention when a lead rod having a deformed portion on the outer peripheral surface is used. In the lead rod 31 in this example, a plurality (three in the example in the figure) of annular grooves 32 are formed on the outer peripheral surface thereof by, for example, cutting so as to be spaced apart in the length direction, thereby forming a deformed portion 33. Have been.

The lead rod 31 is placed in the molding die 10 with the deformed portion 33 located above the sleeve member 12, and in the formed powder laminate 34,
At the level of the deformed portion 33 of the lead rod 31, the mixture layer has a conductive inorganic substance powder content of 75% by weight or more. Except for the above, FIG.
The powder laminate 34 is formed in exactly the same manner as in the above example, and the molded laminate obtained by pressure molding is subjected to a sintering process. The lamp electrical lead body is hermetically joined to the hermetically joined area C at the portion 33, and is fixed and integrally connected.

In this lamp sealing body, the content ratio of the conductive inorganic substance powder in the mixed powder layer where the deformed portion 33 of the lead rod 31 is located is 75% by weight or more, so that the lead rod It is possible to prevent the occurrence of cracks due to the difference in the coefficient of thermal expansion from the thermal expansion coefficient 31.

According to the above-described method of manufacturing the electric power guide for a lamp, even when the lead rod 31 having the deformed portion 33 formed on the outer peripheral surface is used, the lead rod 31 has no particular problem. Can be manufactured with the deformed portion 33 embedded therein and connected to the sealing member. According to such a lamp electricity introducing body, since the lead bar 31 has the deformed portion 33, the lead bar 31 is held with a sufficient holding force by the sealing member, so that large mechanical strength is obtained. . Also, deformed part 3
In No. 3, since the creepage distance in the length direction on the contact surface with the functionally graded material is increased, the airtightness, which is likely to be a problem in the lead-through-type lamp electric introducer, can be made sufficiently high. .

On the other hand, in a lead rod non-penetrating type lamp electric lead body as in the example of FIG. 5, airtightness is usually sufficient, but joining of the inner lead rod 28A and the outer lead rod 28B to the sealing member is performed. Since it is difficult to obtain a sufficient length, there is a great possibility that the holding thereof will be insufficient, and since the contact area is small, a sufficient electrical connection state may not be obtained. However, according to the manufacturing method of the present invention, the internal lead rod 28 in the example of FIG.
A portion buried in one or both of the sealing members of the A and the external lead rod 28B may be formed with a deformed portion, for example, by an annular groove. And at the same time, a sufficient electrical connection state can be reliably obtained.

According to the lamp electric introduction body obtained by the method of the present invention, the cylindrical portions at both ends of the tubular body made of, for example, silica glass constituting the lamp vessel are connected to the bulb welding region A of the lamp electric introduction body. By being hermetically welded to the outer peripheral surface of the above, a hermetically sealed lamp vessel is obtained. A discharge electrode is provided at the tip of a lead rod or an internal lead rod located in the lamp to form a discharge lamp, or a light emitting filament coil is connected to form an incandescent lamp.

Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above examples, and various changes can be made. For example,
In order to form a gap between the lead rod and the valve welding region of the sealing member, for example, in the example shown in FIG. 3, a gap formed of an organic polymer material instead of the sleeve-like metal member 24 is formed. For example, a means for evaporating and eliminating the gap forming member by a heat treatment in the preliminary sintering step may be used. In this case, as a specific example of the organic polymer substance, for example, a synthetic resin such as an acrylic resin, polypropylene, or polystyrene can be used.

Further, in the method of the present invention, the specific material, composition and structure of the functionally graded material constituting the sealing member, the material and dimensions of the lead rod, and the specific material in forming the powder laminate or the molded laminate. The specific conditions of the preliminary sintering process and the main sintering process, including the conditions and the presence or absence of the preliminary sintering process, can be appropriately selected depending on the characteristics and scale of the target electric power guide for a lamp.

[0042]

According to the manufacturing method of the lamp electric guide of the present invention, in the pressure forming step for manufacturing the functionally graded material, the formed laminated body in which a part of the lead rod is embedded is formed. By performing a sintering process, a lead electrode is hermetically fixed to a functionally graded material made of a sintered body, and an electric lead body for a lamp is integrally held. Therefore, there is no need to perform cutting work on the pre-sintered body, and there is no need for a step of inserting the lead rod into the lead rod insertion hole. can do.

Further, the lead rod is not fixed using the hole formed in the pre-sintered body which is the precursor of the functionally graded material, but the lead rod is buried from the point of forming the powder laminate. Therefore, the shape of the embedded portion of the lead rod does not need to be linear. Therefore, a deformed portion can be formed on the outer peripheral surface of the lead rod in advance, and the deformed portion can be embedded. As a result, the lead rod can be held by the functionally graded material with a sufficient holding force due to the deformed portion, and a lamp electricity introducing body having high airtightness and a sufficient electrical connection state is manufactured. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing one embodiment of a method of manufacturing a lamp electric introducer of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a lamp electric introducer obtained by the method of FIG.

FIG. 3 is an explanatory cross-sectional view showing another embodiment of the method of manufacturing the lamp electric introduction body of the present invention.

FIG. 4 is an explanatory cross-sectional view showing a lamp electric introducer obtained by the method of FIG. 3;

FIG. 5 is an explanatory cross-sectional view showing still another embodiment of the method for producing a lamp electric introduction body of the present invention.

FIG. 6 is an explanatory cross-sectional view showing a method for manufacturing a lamp electricity introducing body of the present invention when a lead rod having a deformed portion on an outer peripheral surface is used.

FIG. 7 is an explanatory cross-sectional view showing a form of a pre-sintered body in a conventional method for manufacturing a lamp electric introduction body.

FIG. 8 is an explanatory cross-sectional view showing a form of an electric introduction body for a discharge lamp obtained by the provisional sintered body of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Molding die 11 Lower press member 11a Lead rod holding hole 12 Sleeve member 13 Lead rod 14 Powder laminated body 15 Through hole 16 Upper press member 16a External lead rod insertion hole 20 Lamp electric introducing body 21 Sealing Member A Bulb welding area B Intermediate area C Hermetic bonding area S Gap 24 Sleeve-shaped metal member 25 Lamp electrical introducer 28A Internal lead rod 28B External lead rod 31 Lead rod 32 Annular groove 33 Deformed part 34 Powder laminate 40 Formed body 40A One end face 40B Other end face 41 Internal lead rod insertion hole 42 External lead rod insertion hole 43 Internal lead rod 44 External lead rod 46 Functionally graded material 48 Electrode coil

Claims (4)

[Claims] 1. A conductive material prepared by mixing a conductive inorganic material component and an insulating inorganic material component at a predetermined ratio in a molding die in which a lead bar is held so as to protrude inside. By sequentially filling a plurality of mixtures having different content ratios of the inorganic substance components, a powder laminate formed by laminating a plurality of mixture layers in which the content ratios of the conductive inorganic material components change in one direction is pressed. By molding and sintering the molded laminate obtained with a part of the lead rod embedded therein, the lead rod is air-tightly fixed to the functionally graded material made of the sintered body and held together. A method for producing a lamp electric introducer, characterized by producing a lamp electric introducer obtained as described above. 2. The lamp according to claim 1, wherein the lead rod has a deformed portion formed of a concave portion or a convex portion formed on an outer peripheral surface of a portion located in the molded laminate. A method for manufacturing an electric induction body. 3. The molding die is characterized in that a lead rod is held by a lower pressurizing member so as to protrude upward, and a powder laminate is formed in a state where the lead rod penetrates up and down. A method of manufacturing the lamp electrical lead-in body according to claim 1. 4. A molding die has one lead rod held by a lower pressurizing member so as to protrude upward,
The upper pressurizing member holds the other lead rod so as to project downward, and the molded laminate is formed in a state where the upper end of one lead rod and the lower end of the other lead rod are buried. 3. The method for producing a lamp electrical lead-in body according to claim 1 or claim 2.