JP2000260395A - Electricity introducing body for lamp, and lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold a lead bar on a sealing member using a sufficient holding force and to provide enough air-tightness, by forming a deformation portion comprising a recessed part or a projecting part on an outer peripheral surface of the lead bar in an airtight joint region of the sealing member made of a tilting function material. SOLUTION: A lead bar 22 is a metal round-bar-shaped rod, and comprises an inner lead structure portion 24, a deformation portion 23, and an outer lead structure portion 25, and the deformation portion 23 is positioned in an air-tight joint region C. The rear end of the inner lead structure portion 24, the deformation portion 23, and the front end of the outer lead structure portion 25 are positioned and adhered to the air-tight joint region C of a sealing member 21, and are air-tightly joined with the lead bar 22 and a tilting function material for constituting the sealing member 21. In the deformation portion 23, a plurality of annular grooves 26 extending over the entire circumference of the outer peripheral surface of the lead bar 22 are formed in such a state that they are separated from each other longitudinally of the lead bar 22. These annular grooves are formed by cutting and machining the outer peripheral surface of the lead bar material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp electric introducer and a lamp for sealing a container 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.

FIG. 1A is a cross-sectional view for explaining an example of the configuration of a conventional lamp electric introducing body. A lamp electric introducing body 10a in this example has a cylindrical sealing material made of a functionally graded material. The sealing member 11a includes a stopper member 11a and a lead rod 12a that is inserted and held in a direction in which the content ratio of the conductive inorganic material component in the sealing member 11a changes (right and left direction in the figure). A valve welding region A in which the content ratio of the conductive inorganic substance component is zero or a low content ratio is an insulating portion, and an intermediate region B in which the content ratio of the conductive inorganic material component is higher than the valve welding region A. And an airtight junction region C which is a conductive portion having a higher content ratio of the conductive inorganic substance component than the intermediate region B.

[0004] Valve welding area A of this sealing member 11a
The end of a bulb material made of, for example, silica glass is welded to form a lamp container, and the lead rod 12
A discharge electrode or a light emitting filament is provided at the front end of a (the left end in the figure, but not shown) to constitute a lamp. In the above description, the material of the lead rod 12a is a metal such as tungsten or molybdenum, the insulating inorganic material component forming the sealing member 11a is, for example, silica, and the conductive inorganic material component is, for example, molybdenum.

In the sealing member 11a, the through hole 14 extends from the end face of the valve welding region A in the direction in which the content ratio of the conductive inorganic substance component increases (to the right in the figure).
Are formed, and the lead rod 12a is inserted into the through hole 14. The through hole 14 is a tapered portion 13 having a diameter larger than the outer diameter of the lead rod 12a in the valve welding region A, and having a smaller diameter as approaching the hermetic joint region C in the intermediate region B. ,
It is joined to the outer peripheral surface of the lead rod 12a in an airtight manner.

With the above configuration, the lead rod 12a is airtightly joined to the sealing member 11a in the airtight joining area C, and is fixed and held. In the valve welding region A and the intermediate region B, the lead rod 12
The gap S formed by the through hole 14 between the outer peripheral surface of the sealing member 11a and the sealing member 11a causes the sealing member 11a to be generated due to a difference in the coefficient of thermal expansion when both are in close contact. , Cracks are prevented from occurring.

However, in the lamp electric introducing body 10a having the above-described structure, the lead rod 12a is hermetically joined to the sealing member 11a in the hermetic joint region C. If is small,
Sufficient airtightness cannot be obtained, and the gas sealed in the lamp vessel may leak. On the other hand, if the length of the hermetic bonding region C is increased, sufficient airtightness can be obtained. However, in this case, there is a problem that the overall length of the lamp is increased.

FIG. 1 (b) is a cross-sectional view for explaining another example of the configuration of a conventional lamp electric introducing body. The lamp electric introducing body 10b of this embodiment has the same structure as described above. A sealing member 11b made of a functionally graded material and an internal lead rod 12b
And an external lead rod 17. The inner lead rod 12b is provided in the valve welding region A of the sealing member 11b.
Is inserted into the internal lead rod insertion hole 15 formed so as to extend beyond the intermediate region B from the end surface, and the rear end portion (right end portion in the figure) is fixed and held in a state of protruding into the hermetic joining region C. A discharge electrode or a light emitting filament is provided at the front end of the internal lead rod 12b. On the other hand, an external lead rod insertion hole 16 extending from the outer end surface thereof is formed in the hermetic joining region C of the sealing member 11b, and the external lead rod 17 has its front end inserted into the external lead rod insertion hole 16. The portion is fixed and held in a state where it protrudes.

In this lamp electricity introducing body 10b, the inner lead rod 12b and the outer lead rod 17 are not continuous, but both are connected to the hermetic joint area C of the sealing member 11b.
Are electrically connected due to the conductivity in.

However, in the lamp electric lead body 10b having the above-described structure, the length d of the rear end portion of the internal lead rod 12b that enters the hermetic joint region C of the sealing member 11b must be sufficiently large. Therefore, the internal lead rod 12b cannot be held with a sufficiently large holding force, and there is a possibility that the internal lead rod 12b may fall off, and the electrical connection cannot be made sufficient. There's a problem.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made based on the above circumstances, and its object is to provide:
It is an object of the present invention to provide an electric power guide for a lamp in which a lead member can be held by a sealing member made of a functionally graded material with a sufficient holding force and sufficiently high airtightness can be obtained.
It is another object of the present invention to provide a lamp electricity introducing body that can hold a lead bar with a sufficient holding force to a sealing member made of a functionally graded material and that can obtain a sufficient electrical connection state. It is in. Still another object of the present invention is to provide a lamp with high reliability.

[0012]

According to the present invention, there is provided a lamp electric guide comprising a sealing member made of a functionally graded material, and a lead rod fixedly inserted in the sealing member.
The sealing member is formed by stacking a plurality of mixture layers each including a mixture of a conductive inorganic material component and an insulating inorganic material component such that the content ratio of the conductive inorganic material component increases stepwise as going in one direction. In the hermetic joining region of the sealing member,
A deformed portion comprising a concave portion or a convex portion is formed on the outer peripheral surface of the lead rod.

[0013] In the above-described lamp electric guide, the deformed portion of the lead rod is located at a portion where the content of the conductive inorganic substance component of the functionally gradient material according to the sealing member is 75% by weight or more. Is preferred.

[0014] The electric power introducing body for a lamp according to the present invention comprises a sealing member made of a functionally graded material, and a lead rod fixed to the sealing member with one end protruding from the sealing member. Is formed by laminating a plurality of mixture layers each composed of a mixture of a conductive inorganic material component and an insulating inorganic material component, and each of the mixture layers has a step ratio of the conductive inorganic material component in one direction. And a deformed portion formed of a concave portion or a convex portion is formed on the outer peripheral surface of the lead rod in the hermetically bonded region of the sealing member.

[0015] In the above-described lamp electric guide, the deformed portion of the lead rod is located at a portion where the content of the conductive inorganic substance component of the functionally gradient material according to the sealing member is 55% by weight or more. Is preferred.

In the lamp electric lead body described above, the length of the linear length in the longitudinal direction of the deformed portion of the lead rod is L, and the length of the creepage distance in the longitudinal direction along the shape of the deformed portion is Ls.
In this case, the value of the ratio Ls / L is preferably 1.1 or more. It is preferable that the deformed portion of the lead rod is constituted by a plurality of annular grooves which are separated from each other in the longitudinal direction.

[0017] The lamp of the present invention is characterized in that a hermetic sealing structure is formed by the above-described lamp electrical introducer.

[0018]

In the electric power guide for a lamp according to the present invention, a deformed portion formed of a concave portion or a convex portion is formed on the outer peripheral surface of the lead rod in the hermetically bonded region of the sealing member made of the functionally gradient material. The lead rod can be held by the sealing member with a large holding force. Further, in the lead-through-type lamp electricity introducing body, the deformed portion is formed in the lead rod, so that the length of the creepage distance in the longitudinal direction of the lead rod along the surface in contact with the sealing member is large. Therefore, high airtightness is obtained, and therefore, leakage of the sealed gas in the lamp is prevented. Also,
In the lead rod non-penetrating type lamp electric introducer, since the contact area of the lead rod with the sealing member increases, it is possible to obtain a sufficient electrical connection state with the conductive portion of the sealing member. it can.

According to the lamp of the present invention, the hermetic sealing structure is formed by the above-mentioned electric conductor for the lamp, so that the lead rod is securely held, a large mechanical strength is obtained, and a sufficiently high airtightness is obtained. Is obtained, and there is no possibility that the sealed gas leaks, or a sufficient electrical connection state can be obtained, so that high reliability can be obtained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 2 is an explanatory cross-sectional view showing an example of the configuration of the lead-through-type lamp electricity introducing body of the present invention. The lamp electric introducing body 20 includes a sealing member 21 made of a functionally graded material, and a lead rod 22 fixedly inserted in the sealing member 21.

The functionally gradient material constituting the sealing member 21 is as follows:
An insulating inorganic material layer and a plurality of mixture layers each of which is a mixture of a conductive inorganic material component and an insulating inorganic material component. The conductive inorganic material is directed toward one specific direction (rightward in the figure). The layers are stacked in such a manner that the content ratio of the components increases in a graded or stepwise manner. A valve welding area A made of an insulating inorganic material layer is located at one end (the left end in the figure) of the figure, and the conductivity increases toward the right side of the area, and the conductive gas passes through the intermediate area B. A hermetic sealing formation region C is formed. Here, in the hermetic seal formation region C, the content ratio of the conductive inorganic substance component is 75% by weight.
This is the area described above.

Here, specific examples of the material suitably used as the insulating inorganic substance component include silica glass, quartz, alumina, zirconia, magnesia, silicon carbide, titanium carbide, silicon nitride, aluminum oxynitride and the like. Can be Further, specific examples of a material suitably used as the conductive inorganic substance component include, for example, molybdenum, nickel, tungsten, tantalum, chromium, platinum, zinc, and the like.

The lead rod 22 is formed of a round rod made of a metal such as tungsten or molybdenum, and has an internal lead component 24 extending leftward in the figure and a deformed portion 23 following the rear end of the internal lead component 24. And an external lead component 25 following the rear end of the deformed portion 23. The deformed portion 23 is located in the hermetic joint region C.

In the valve welding region A of the sealing member 21, a hole larger than the outer diameter of the lead rod 22 is formed, and a gap S is formed therebetween. This hole is airtight in the intermediate region B. The tapered portion 27 gradually decreases in diameter as it approaches the joining region C.

The rear end portion, the deformed portion 23, and the front end portion of the external lead component 25 of the lead bar 22 are positioned and fixed to the hermetic joint area C of the sealing member 21. As a result, the lead bar 22 and the functionally graded material constituting the sealing member 21 are airtightly joined to each other, and the front portion of the internal lead component 24 and the rear portion of the external lead component 25 are sealed with the sealing member 21. From the outside. At the front end of the internal lead component 24, for example, a discharge electrode or a light emitting filament is provided.

In the illustrated example, each of the deformed portions 23 is formed by forming a plurality of annular grooves 26 extending over the entire circumference on the outer peripheral surface of the lead rod 22 while being spaced apart in the length direction of the lead rod 22. In this example, three annular grooves 26 are formed, and as a result, two annular protrusions are formed. Such an annular groove, for example,
It can be formed by cutting the outer peripheral surface of the lead rod material.

The portion of the hermetic bonding region C where the deformed portion 23 is located is a portion where the content of the conductive inorganic substance component in the functionally gradient material is 75% by weight or more. When the content of the conductive inorganic substance component at the location is less than 75% by weight, the coefficient of thermal expansion does not become close to that of the lead rod 22. There is a possibility that cracks may occur in the first layer 21.

FIG. 3 is an explanatory cross-sectional view showing a pressurizing step in a manufacturing step of the above-described lamp electric introducer. As shown in this figure, a lead rod 22 in which an annular groove 26 has been formed in advance is produced, and this lead rod 22 is attached to a sleeve member 31 for forming a gap at the bottom of a cylindrical molding die 30.
Is held in an upright state on the lower pressurizing member 32 having an insulating inorganic material powder in a layered form in the molding die 30. Further, the conductive inorganic material powder and the insulating inorganic material are A plurality of mixed powders obtained by mixing powders with different contents are filled in layers in order from the mixed powder having the lowest content of the conductive inorganic substance powder to form a powder laminate 34. Here, at the level of the deformed portion 23 of the lead rod 22, the formed mixture layer has a conductive inorganic substance powder content of 75% by weight or more.

Thereafter, the upper pressing member 33 having a through hole 33A having an inner diameter adapted to the outer diameter of the lead rod 22 at the center.
Is brought into contact with the upper surface of the powder laminate 34 in a state where the external lead component 25 of the lead rod 22 relatively enters the through hole 33A, and both the upper pressing member 33 and the lower pressing member 32 Are pressed to approach each other, thereby forming a laminated molded body. By subjecting the laminated molded body to a heat treatment at a maximum heating temperature of 1000 to 1200 ° C. in, for example, a non-oxidizing gas atmosphere, an electrically conductive material as a temporary sintered body is obtained.

Thereafter, the pre-sintered body is heated at a temperature higher than the temperature in the pre-sintering step to perform the main sintering. This main sintering is performed, for example, in a non-oxidizing gas atmosphere or in a reduced pressure atmosphere of, for example, 10 ⁻³ Pa or less.
It is performed under the condition of 0 to 2000 ° C. As a result, a lamp electricity introducing body 20 is obtained in which the lead rod 22 is integrally fixed and connected to the sealing member 21 made of the functionally graded material by so-called shrink fitting.

For example, the sealing member 21 has a total number of 8 to 11 layers, and the outer end layer of the bulb welding region A is an insulating inorganic material containing no conductive inorganic material component. It is a material powder layer, and the outer end side layer of the hermetic bonding region C is preferably a mixture layer in which the content ratio of the conductive inorganic material component is 75 to 85% by weight. As an example of the dimensions of the sealing member 21, the outer diameter is 2.1 to 16 mm, and the valve welding region A
Is 3 to 12 mm, and the length of the intermediate region B is 3 to 20 m.
m, the length of the hermetic bonding region C is 5 to 10 mm. The lead rod 22 has, for example, an outer diameter of 0.6 to 6 mm, a length of the inner lead component 24 of 15 to 50 mm, and a different diameter portion 23.
Is 2.5 to 10 mm, the length of the external lead component 25 is 10 to 20 mm, and the width w of each of the annular grooves 26 is
Is 0.5 to 2 mm, and the spacing between the annular grooves 26 is 0.5 to 2
mm. The gap S between the sealing member 21 and the lead rod 22 in the bulb welding area A is 0.05 to 2 mm at the end face of the bulb welding area A.

In the above-described lamp electric introducing body 20, the length of the linear distance in the longitudinal direction of the deformed portion 23 is L, and the length of the creepage distance in the longitudinal direction along the surface of the deformed portion 23 is Ls. At this time, the ratio (Ls / L) is preferably 1.1 or more. In addition, this ratio (Ls
The value of (/ L) is preferably 1.3 or less from the viewpoint of the strength of the lead bar 22, and if it exceeds 1.3, the strength of the lead bar 22 may be insufficient.

The annular groove 26 forming the deformed portion 23
When the depth is h and the width in the length direction is w, the value of the ratio (h / w) is preferably 0.3 or less. When the value of this ratio exceeds 0.3, stress tends to concentrate on the edge portion 28 of the annular convex portion related to the annular groove 26 during pressure molding, and as a result, cracks are formed on the edge portion 28. This may result in insufficient airtightness.

According to the lamp electric introducing body 20 having the above-described structure, in the hermetic joining area C of the sealing member 21, the outer peripheral surface of the lead rod 22 is formed with a deformed portion formed of a concave portion or a convex portion by the plurality of annular grooves 26. By forming the deformed portion 23, the deformed portion 23 is securely fixed to the functionally graded material portion of the hermetically bonded region C in a state of being hermetically bonded, and thus the lead rod 22 is reliably sealed with a large holding force. Stop member 2
1 can be held. The length L of the creepage distance in contact with the sealing member 21 in the longitudinal direction of the lead rod 22
Since s can be made large, the airtightness between the material of the airtight joint region C and the lead rod 22 can be made sufficiently high. Therefore, in the lamp using the lamp electric introducing body 20, the sealed gas does not leak. And, from the above, the sealing member 21
The length required for the hermetic sealing formation region C may be small, and therefore, a small-sized sealing member 21 can be used.

FIG. 4 is an explanatory cross-sectional view showing an example of the configuration of a lead rod non-penetrating type lamp electric introducer of the present invention.
The lamp electricity introducing body 40 includes a cylindrical sealing member 41 made of the same functionally graded material as in the above example, and a deformed portion 4.
The inner lead rod 42 in which the rear end portion where the 5 is formed protrudes into the hermetic bonding region C of the sealing member 41 and is fixed, and the front end portion protrudes into the hermetic bonding region C of the sealing member 41 and is fixed. An external lead rod 43a is provided.

In this example, the deformed portion 45 at the rear end portion of the internal lead rod 42 is formed by forming two annular grooves similar to the annular groove 26 in the above-described example so as to be separated in the longitudinal direction. I have.

The portion of the hermetic bonding region C where the deformed portion 45 is located is a portion where the content of the conductive inorganic substance component in the functionally gradient material is 55% by weight or more. If the content of the conductive inorganic substance component at the location is less than 55% by weight, sufficient electrical connection may not be obtained due to insufficient conductivity at the location.

In this example, the external lead rod 43a is
The front end portion is fixed to the hermetic joining region C of the sealing member 41 in a state of protruding from the outer end surface. The external lead bar 43a is made of a metal such as tungsten or molybdenum.

According to the lamp electric introducing body 40 having the above structure, the outer peripheral surface of the base end portion protruding into the hermetic bonding region C of the inner lead rod 42 in the hermetic bonding region C of the sealing member 41 is deformed. Since the portion 45 is formed, the internal lead rod 42 is held by the sealing member 41 with a sufficiently large holding force, and the internal lead rod 42 is As the contact area increases,
Sufficient electrical connection to the conductive portion of the sealing member 41 can be obtained.

In the case of the lead rod non-penetrating type, FIG.
As shown in (1), it is possible to adopt a configuration in which an annular groove similar to that of the internal lead rod 42 is formed in the front end portion of the external lead rod 43b fixed to the sealing member 41 to provide a deformed portion 45b. In this case, the external lead rod 4
3b can be held by the sealing member 41 with a sufficient holding force, and a sufficient electrical connection state to the conductive portion of the sealing member 41 can be obtained.

FIG. 6 is an explanatory cross-sectional view showing an example of a configuration of an incandescent lamp using the lead rod penetrating type lamp electric introducing body 20 shown in FIG. A lamp vessel 51 constituting the incandescent lamp 50 has a straight tubular arc tube portion 52 made of, for example, silica glass, and sealing portions 53 integrally provided at both ends of the arc tube portion 52. , Lamp container 5
Each of the first sealing portions 53 is provided on the outer peripheral surface of the bulb welding region A of the lamp electric introducing body 20 disposed thereon, with the lamp vessel 5.
1 are formed by welding both ends.
A filament coil 54 extending in the length direction is arranged in the arc tube portion 52 of the lamp vessel 51 along the axial direction of the arc tube portion 52.
Are held at the distal end portions of the lead rods 22 of the lamp electricity introducing body 20.

According to the incandescent lamp having the above-described structure, the hermetic sealing structure is formed by the lamp electric introducing body 20, so that the lead rod 22 is securely held, the mechanical strength is large, and the sealed gas is reduced. Since there is no possibility of leakage, high reliability can be obtained.

FIG. 7 is an explanatory sectional view showing an example of the configuration of a discharge lamp using the lamp electric introducing member 40 shown in FIG. The lamp vessel 6 constituting the discharge lamp 60
Reference numeral 1 denotes a substantially elliptical sphere, which is formed by welding the cylindrical portions 62 at both ends to the outer peripheral surface of the bulb welding region A of the lamp electric introducing body 40. Reference numeral 65 denotes a discharge electrode provided with a coil. This discharge lamp 60
In the above, since the hermetic sealing structure is formed by the lamp electric introducing body 40, the internal lead rod 42 is securely held, the mechanical strength is large, and the sealed gas does not leak. Since electrical connection can be obtained, high reliability can be obtained.

Although the present invention has been described in detail, various changes can be made in the present invention. For example, the deformed portion of the lead rod does not need to be formed by a plurality of annular grooves, but may be a single annular groove. The same effect can be obtained by the direction groove.

Also, not the deformed portion obtained by cutting the outer peripheral surface of the lead rod to form a groove or a recess, but the deformation obtained by providing a convex portion projecting outward from the outer peripheral surface of the lead rod. It may be a part. Also in these cases, the value of the ratio of the length Ls of the creepage distance in the longitudinal direction along the shape of the deformed portion to the length L of the linear distance in the longitudinal direction of the deformed portion is 1.1 or more over the entire circumference. Is preferred.

Further, in the manufacture of the lamp electric lead body, a through hole for inserting a lead rod, or a hole for inserting an internal lead rod and an hole for inserting an external lead rod are formed in a functionally gradient material having a required shape. By forming a sealing member and inserting a lead bar having a deformed portion into the sealing member and performing a sintering process, it is also possible to manufacture a lamp electric introducer integrated by baking.

[0047]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. <Embodiment 1> In this embodiment, an electric power guide for a lamp having the structure shown in FIG. 2 is obtained. A lead rod (22) made of tungsten and having an outer diameter of 2 mm is machine-cut with a lathe to have a width (w) of 1.2 mm in a longitudinal direction and a depth (h).
Were formed so that each of the annular grooves (26) having a length of 0.1 mm had a separation distance in the length direction of 1.2 mm, and a deformed portion (23) extending 6.0 mm in the length direction was formed.

99.99 purity as a conductive inorganic substance component
%, A molybdenum powder having an average particle size of 1.0 μm, a purity of 99.99% as an insulating inorganic substance component, and an average particle size of 5.
Various mixed powders having different contents of molybdenum powder were prepared by using silica powder of 6 μm, adding 5.0% by weight of stearic acid as a lubricant and a binder to these material powders, and stirring.

A gap forming member (3) is provided at the bottom of a cylindrical molding die (30) having an internal space with an inner diameter of 8.2 mm.
The lower pressing member (32) having 1) is disposed, and the gap forming member (31) is held with the lead rod (22) standing upright. After the silica powder is filled, the mixed powder contains molybdenum. The powder laminate (34) is filled and laminated in ascending order of decreasing ratio so that the mixed powder layer around the deformed portion (23) of the lead rod (22) has a molybdenum content of about 80% by weight. Was formed. On the other hand, the outer diameter is 8.2 mm and the inner diameter is 2.0 mm from above the molding die (30).
mm upper cylindrical pressing member (33) was brought into contact with the upper surface of the powder laminate (34).

From this state, the powder laminate (34) is pressurized in a state where the final pressure becomes 4.0 MPa to form a laminate molded body, and this laminated molded body is heated to about 1200 ° C. in a hydrogen gas atmosphere. Tentative sintering, and then
By performing a sintering process at a maximum heating temperature of about 1700 ° C. in a vacuum of 10 ⁻³ Pa, the lead rod (22)
2 and a sealing member (21) made of a functionally graded material were integrally joined to produce a lead-through-type lamp electricity introducing body (20) having the configuration of FIG. 2. This lamp electric introducing body has an outer diameter of 7.0 mm and a bulb welding area (A).
The length of the airtight joint area (C) is 7 mm,
The total length is 23 mm.

A performance evaluation experiment was conducted on the obtained lamp electrical lead body to check the degree of air tightness of the joint between the lead rod and the sealing member based on the presence or absence of leakage. Specifically, the bulb welding region of the lamp electrical introducer is arranged in one end of a glass tube having an inner diameter of 8 mm, and the inner peripheral surface of the glass tube and the outer peripheral surface of the bulb welding region are bonded with an epoxy adhesive. When the inside of the glass tube is evacuated by a vacuum pump connected to the other end of the glass tube, and the degree of vacuum reached at this time is measured, and the value of the degree of vacuum is 2 × 10 ⁻³ Pa or less. Was determined as having no leak. Table 1 shows the results.

<Embodiment 2> The depth (h) of each annular groove constituting the deformed portion (23) of the lead rod (22) is 0.3.
Except for mm, a lamp electrical introducer was manufactured in the same manner as in Example 1, and a performance evaluation experiment was conducted to check for the presence or absence of leakage. Table 1 shows the results.

<Comparative Example 1> An electric conductor for a lamp (10a) was prepared in the same manner as in Example 1 except that a lead rod (12a) having no deformed portion was used, and a performance evaluation experiment was performed. Was. Table 1 shows the results.

<Reference Example 1 and Reference Example 2>
Except for changing the depth (h) of each of the annular grooves constituting the deformed portion (23) of 2), an electric power guide for a lamp was manufactured in the same manner as in Example 1 and the presence or absence of leakage was examined. A performance evaluation experiment was performed. Table 1 shows the results.

[0055]

[Table 1]

From the above results, basically, in the joint portion between the sealing member and the lead rod, the lamp electric guide having the deformed portion formed on the outer peripheral surface of the lead is a lamp having no deformed portion. The danger of the occurrence of leaks is reduced as compared with the electric introduction body for lamps. In particular, in the electric introduction body for lamps having a ratio (Ls / L) of 1.1 to 1.3,
It was confirmed that no leak was detected. Further, in the lamp electric guide of Reference Example 2, since the value of (h / w) was 0.33, stress was concentrated on the edge portion of the deformed portion during pressure molding, and cracks occurred. It is thought that it was done.

Further, a halogen incandescent lamp (50) was manufactured in accordance with the configuration shown in FIG. 6 by using the lamp electrical guide obtained in Example 1. In this halogen incandescent lamp (50), the lamp vessel (51) is made of silica glass, the outer diameter of the arc tube part (52) is 10 mm, the wall thickness is 1 mm, and the inner diameter of the sealing part (53) is 7. The arc tube (52) was filled with argon gas and an appropriate amount of bromide. The rated lamp power of the halogen incandescent lamp (50) is 2000W. The halogen lamp (50) thus manufactured was subjected to a continuous lighting test under rated lighting conditions. As a result, stable lamp characteristics were obtained even when the lighting time exceeded 3000 hours, and the lamp was highly reliable. It was confirmed that.

[0058]

According to the lamp electric guide of the present invention,
In the hermetic joining region of the sealing member made of the functionally graded material, a deformed portion made of a concave portion or a convex portion is formed on the outer peripheral surface of the lead bar, so that the lead bar is held by the sealing member with a large holding force. Can be.

Further, according to the lead-through-type lamp electricity introducing body, the deformed portion is formed on the lead bar, so that the creepage distance in the longitudinal direction of the lead bar along the surface in contact with the sealing member is reduced. Since the length is large, high airtightness is obtained, and thus, leakage of the sealed gas in the lamp is prevented. Further, according to the lamp rod non-penetrating type electricity introducing body, since the contact area of the lead rod with the sealing member increases, a sufficient electrical connection state between the lead rod and the conductive portion of the sealing member is established. Obtainable.

According to the lamp of the present invention, the hermetic sealing structure is formed by the above-mentioned electric power source for the lamp, so that the lead rod is securely held, sufficiently high airtightness is obtained, and the sealed gas is filled. There is no risk of leakage or a sufficient electrical connection state can be obtained, so that high reliability can be obtained.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view for explaining a conventional lead-through-type lamp electric introducer for a lamp, and FIG. 1B is a cross-sectional view for explaining a conventional lead-rod non-penetrating lamp electric introducer. .

FIG. 2 is an explanatory cross-sectional view showing an example of the configuration of the lead-through-type lamp electricity introducing body of the present invention.

FIG. 3 is a cross-sectional view for explaining a method of manufacturing the electric power guide for a lamp of FIG. 2;

FIG. 4 is an explanatory cross-sectional view showing an example of the configuration of a lead rod non-penetrating type lamp electricity guide of the present invention.

FIG. 5 is an explanatory sectional view showing a modification of the example of FIG. 4;

FIG. 6 is an explanatory cross-sectional view showing an example of a configuration of an incandescent lamp using the lamp electrical introducer of FIG. 2;

FIG. 7 is an explanatory cross-sectional view showing an example of a configuration of a discharge lamp using the lamp electrical introducer of FIG.

[Explanation of symbols]

 10a, 10b Lamp Electric Inductor 11a, 11b Sealing Member 12a Lead Rod 12b Internal Lead Rod 13 Tapered Portion 14 Through Hole 15 Internal Lead Rod Insertion Hole 16 External Lead Rod Insertion Hole 17 External Lead Rod A Valve welding area Reference Signs List B Intermediate Region C Hermetic Joint Region S Gap 20 Lamp Electric Inductor 21 Sealing Member 22 Lead Rod 23 Deformed Portion 24 Internal Lead Constituent Portion 25 External Lead Constituent Portion 26 Annular Groove 27 Taper Portion 28 Edge Portion 30 Molding Mold 31 Sleeve member 32 Lower pressing member 33 Upper pressing member 33A Through-hole 34 Powder laminate 40 Electric lead body for lamp 41 Sealing member 42 Internal lead rod 43a, 43b External lead rod 45 Deformed part 45b Deformed part 50 Halogen incandescent lamp 51 Lamp container 52 Arc tube 53 Sealing 54 filament coil 60 discharge lamp 61 the lamp vessel 62 both end cylindrical portions 65 discharge electrode

Claims (7)

[Claims] 1. A sealing member made of a functionally graded material, and a lead rod fixedly inserted in the sealing member, wherein the sealing member is composed of a conductive inorganic material component and an insulating inorganic material. A plurality of mixture layers composed of a mixture with a substance component are formed of a functionally graded material composed of a laminate laminated such that the content ratio of the conductive inorganic substance component increases stepwise as going in one direction, and a sealing member. Wherein a deformed portion comprising a concave portion or a convex portion is formed on the outer peripheral surface of the lead rod in the sealing portion forming region of (1). 2. The deformed portion of the lead bar is located at a portion where the content of the conductive inorganic substance component of the functionally graded material relating to the sealing member is 75% by weight or more. 3. The electric lead body for a lamp according to claim 1. 3. A sealing member made of a functionally graded material, and a lead rod fixed to the sealing member with one end thereof protruding, wherein the sealing member is insulated from a conductive inorganic material component. A plurality of mixture layers composed of a mixture with a conductive inorganic substance component are laminated, and each of the mixture layers has a gradient function including a laminate in which the content ratio of the conductive inorganic substance component increases stepwise in one direction. A lamp electricity introducing body, comprising a material, and a deformed portion formed of a concave portion or a convex portion is formed on an outer peripheral surface of a lead rod in a sealing portion forming region of a sealing member. 4. The lead rod according to claim 3, wherein the deformed portion is located in a portion where the content of the conductive inorganic substance component of the functionally gradient material according to the sealing member is 55% by weight or more. 3. The electric lead body for a lamp according to claim 1. 5. When the length of the linear distance in the longitudinal direction of the deformed portion of the lead rod is L, and the length of the creepage distance in the longitudinal direction along the shape of the deformed portion is Ls, the value of the ratio Ls / L is: 1.1
The electric power introducing body for a lamp according to any one of claims 1 to 4, characterized in that: 6. The lamp according to claim 1, wherein the deformed portion of the lead rod is constituted by a plurality of annular grooves spaced apart from each other in the length direction. body. 7. A lamp, wherein a hermetic sealing structure is formed by the electric power guide for a lamp according to any one of claims 1 to 6.