JP2000260394A - Lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce release of vaporizing material from a blocking body made of functionally gradient materials and prevent breakage of the blocking body. SOLUTION: The lamp has a bulb 10 having an arc tube part 11 and a sealing tube part 12 connected to the both ends of the arc tube part 11; and a column blocking body 20 arranged within a sealing tube part 12, the blocking body 20 is constituted with functionally gradient materials having an insulating part 21 on the inner end side and a conductive part 22 on the outer end side, the sealing tube part 12 is bonded to the insulating part 21 to form sealing structure, and a power feed member 35 extending in the axial direction from the outer end part of the blocking body 20 is installed, and a sleeve part 13 having the inner diameter larger than the outer diameter of the blocking body 20 is formed at each outer end of the sealing tube part 12 so as to extend outward along the axial direction, a displacement limiting member 40 having a through hole of the power supply member 35 is held on the inside of the sleeve, and a minute clearance is formed between the displacement limiting member 40 and the power supply member 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp and an incandescent lamp having an obstruction made of a functionally gradient material.

[0002]

2. Description of the Related Art Conventionally, as a structure of a sealing portion of a discharge lamp or an incandescent lamp, a foil seal type using a sealing metal foil is known. Recently, there has been proposed a means for forming a sealing portion by using a closing member made of a functionally graded material provided with an electrode member and sealing the closing tube portion of the valve to the closing member. ing.

FIG. 3 is an explanatory sectional view showing the structure of an example of a conventional discharge lamp having a closed body made of a functionally gradient material. In this discharge lamp, the bulb 10
Is made of, for example, silica glass, and is formed by integrally connecting sealing tube portions 12 extending in the axial direction to both ends of an elliptical spherical arc tube portion 11. A cylindrical closing body 20 made of a functionally graded material having an outer diameter compatible with the sealing tube 12 is arranged in the sealing tube 12 of the valve 10. The functionally gradient material constituting the closing body 20 is formed of a sintered body of a conductive inorganic material component and an insulating inorganic material component, and the concentration of the conductive inorganic material component changes in a gradient along the axial direction, As a result, an integrated material having both an insulating portion having a low concentration of the conductive inorganic substance component and having properties as an insulating material and an insulating section having a high concentration of the conductive inorganic substance component and having properties as a conductor It is. In the closing body 20, an insulating portion 21 is formed on the inner end side, and a conductive portion 22 is formed on the outer end side.
The sealing structure is formed by being welded to the zero insulating portion 21.

[0004] However, it has been found that such a discharge lamp has the following problems. (1) Since the temperature of the closing member 20 rises during the operation of the discharge lamp, a substance such as an insulating inorganic substance component or an oxide thereof in the functionally gradient material constituting the closing member 20 evaporates and is discharged to the outside. Is done. As a result, when the lamp device is constituted by the discharge lamp and the reflector, the reflector is contaminated by the evaporating substance from the closing body 20 of the discharge lamp.
There is a problem. (2) Since the functionally gradient material constituting the closing body 20 is fragile, there is a problem that the closing body 20 is broken when a large stress is applied to the closing body 20 directly or via the power supply member 35. Further, such a problem is not limited to a discharge lamp, but also occurs in a lamp such as a halogen lamp, an incandescent lamp, and a heater lamp which emits light by a filament.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made based on the above circumstances, and its object is to provide:
In a lamp having a closure made of a functionally gradient material,
An object of the present invention is to provide a lamp in which evaporative substances from the closing body are not discharged to the outside or reduced. Another object of the present invention is to provide a lamp that can prevent breakage of a closing body.

[0006]

According to the present invention, there is provided a lamp having a light emitting tube portion and a sealing tube portion connected to both ends of the light emitting tube portion, and a circle disposed in the sealing tube portion. A column-shaped closing body, the closing body is made of a functionally graded material having an insulating portion on the inner end side and a conductive portion on the outer end side, and the insulating portion of the closing body is In a lamp, a sealing structure is formed by welding a sealing tube portion of a bulb, and a power supply member extends in an axial direction from an outer end of the closing body. At each outer end, a sleeve portion having an inner diameter larger than the outer diameter of the closing body is formed so as to extend outward in the axial direction, and a displacement limiting member having a through hole for the power supply member is provided. It is held on the inner surface of the sleeve, and this Wherein the small clearance between the position restricting member and the feed member are formed.

[0007]

According to the lamp of the present invention, since the sleeve and the displacement limiting member are formed at the outer end of the sealing tube of the bulb, the evaporative substances from the closed body can be removed during the operation of the discharge lamp. As a result of adhering to the inner surface of the sleeve portion or the inner surface of the displacement limiting member, the emission of the evaporated substance to the outside is suppressed. Further, since the rod-shaped power supply member extending outward in the axial direction from the outer end portion of the closing body penetrates through the displacement limiting member held by the sleeve portion of the valve with a small gap, the structure is provided. In addition, the stress generated in the closing body during the manufacture of the lamp can be reduced. Furthermore, even after the manufacture of the lamp, undesired stress generated in the closed body can be reduced in various measurements and in the work of incorporating the lamp into the reflector.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the discharge lamp according to the present invention will be described. [First Embodiment] FIG. 1 is an explanatory sectional view showing a part of the configuration of a discharge lamp according to a first embodiment of the present invention, and the overall shape is substantially the same as that shown in FIG. Since the left half is the same as the right half, the description is omitted.
In this discharge lamp, the bulb 10 is made of, for example, silica glass, and a sealing tube portion 12 extending in the axial direction is integrally connected to both ends of an elliptical spherical arc tube portion 11. A sleeve portion 13 having an inner diameter larger than an outer diameter of a closing body 20 described later is provided at each outer end of the portion 12.
Are integrally formed so as to extend outward along the axial direction.

A cylindrical closing body 20 made of a functionally graded material having an outer diameter suitable for the sealing tube 12 is arranged in the sealing tube 12 and the sleeve 13 of the valve 10. . The functionally graded material constituting the closing body 20 is made of a sintered body of a conductive inorganic material component and an insulating inorganic material component, and the concentration of the conductive inorganic material component changes from one end to the other in a gradient, As a result, an integrated material having both a conductive portion having a high concentration of the conductive inorganic substance component and having properties as a conductor and an insulating section having a low concentration of the conductive inorganic substance component and having properties as an insulating material It is. In the present invention, the concentration of the conductive inorganic substance component in the closed body 20 increases from the inner end side to the outer end side, whereby the insulating portion 21 is formed on the inner end side of the closed body 20. A conductive portion 22 is formed on the outer end side of the closing body 20. The conductive inorganic substance component concentration at the inner end of the closing body 20 is substantially 0% by volume, and the conductive inorganic substance component concentration at the outer end of the closing body 20 is, for example, 50% by volume. Here, as the conductive inorganic substance component, for example, metals such as molybdenum, nickel, tungsten, tantalum, chromium, platinum, and zinc, molybdenum silicide, molybdenum carbide, and tantalum carbide can be used. As the insulating inorganic substance component, silica glass,
Quartz (SiO2), alumina (AlO3), titanium carbide, silicon nitride (Si3N), aluminum oxynitride (AlON), or the like can be used. The sealing tube 12 of the valve 10 is connected to the insulating portion 21 of the closing body 20.
To form a sealing structure.

The closed body 20 is formed with a bottomed hole extending in the axial direction from the inner end face thereof, into which the base end of an electrode rod 30 made of, for example, tungsten is inserted. The distal end of the electrode rod 30 is fixed in a state of being located in the arc tube part 11 of the bulb 10. Also,
At the outer end of the closing body 20, a bottomed hole extending in the axial direction from the end surface is formed, and a rod-shaped power supply member 35 extending outward is inserted into the bottomed hole and fixed. I have.

Here, the power supply member 35 extends outward through the disk-shaped displacement limiting member 40. Sleeve 13
Has a reduced diameter structure at the holding portion of the displacement limiting member 40, and the sleep 13 and the displacement limiting member 40 are in close contact with each other. If both are made of the same material, in this embodiment, quartz glass, they will be fused and fixed. The power supply member 35 is provided with the displacement limiting member 4.
0, but has a slight clearance at the through hole 41. Thus, when the sleeve is heated to reduce the diameter, the displacement limiting member 40 can move to some extent freely in the axial direction of the discharge lamp, and as a result, the stress generated in the closing body can be favorably prevented.

Here, in order to show the excellent effects of the present invention, a structure which does not belong to the technical scope of the present invention is shown in FIG. 4 and described in comparison with the present invention. The structure shown in FIG. 4 has a structure in which a support member 50 corresponding to a displacement limiting member is fixed to a power supply member. Specifically, a ring-shaped support member is attached to the power supply member 35. In such a structure, when the sleeve is shrunk by heating, stress is generated when the sleeve comes into contact with the support member,
Cracks and cracks occur in the closed body. Further, since the inner diameter of the quartz glass constituting the sleeve varies, and the outer diameter of the support member 50 also varies, it is difficult to avoid the occurrence of stress in consideration of the dimensions in advance. On the other hand, if the power supply member penetrates into the through hole provided at the stop of the displacement limiting member as in the present invention, a small clearance is generated, and such stress can be reduced favorably. Can be reduced.
Further, management of the outer diameter of the power supply member and the through-hole of the displacement limiting member can be extremely simplified.

An example of the specific specifications of the above-mentioned discharge lamp is as follows. [Bulb 10] Arc tube part 11: axial length 10.5 mm, maximum inner diameter 4.5 mm, sealing tube part 12: axial length 3 mm, inner diameter 3 mm, sleeve part 13: axial length 7mm, 3.4m inside diameter
m, [occluding body 20] 13 mm in axial length, 3 mm in diameter, [electrode 30] 13 mm in axial length (total length including a portion embedded in the closing body 20), 0.6 mm in diameter, [power supply Member 35] Length in the axial direction (total length including the portion embedded in the closing body 20) 10 mm, diameter 0.6 mm, [Displacement limiting member 40] outer diameter 2.55 mm, thickness in the axial direction 2.0 mm, Opening diameter of through-hole 0.45 mm [Lamp characteristics] Lamp voltage 65.5 V, lamp current 2.
29A In general, numerical examples of the displacement limiting member 40 include an outer diameter of 2.55 to 3.4 mm and a thickness of 2.0 to 5.0 in the axial direction.
The numerical value can be applied in the range of 0.45 to 0.6 mm in the opening diameter of the through hole.

[Second Embodiment] FIG. 2 is an explanatory sectional view showing the structure of a discharge lamp according to a second embodiment of the present invention. In this discharge lamp, the displacement limiting member 20 and the inner surface of the sleeve are held with an adhesive 45 interposed therebetween. In this case, a similar effect can be obtained if a small clearance is generated when the power supply member is passed through the through hole provided substantially at the center of the displacement limiting member 20. In this embodiment, since the displacement limiting member is held by the inner surface of the sleeve by the adhesive, the displacement limiting member does not need to be made of the same material as the sleeve, and the sleeve and the displacement limiting member can be fixed. As such an adhesive, for example, a heat-resistant inorganic adhesive (Aron Ceramic E) or the like can be used.

FIG. 5 is an explanatory sectional view showing the structure of a filament lamp according to a third embodiment of the present invention.
The filament lamp is a halogen lamp, a heater lamp, an incandescent lamp, or the like, and is a lamp using a filament as a light emitting body. Also in this filament lamp, the displacement limiting member 40 and the power supply member 35 have a minute clearance.

[0016]

As described above, according to the lamp of the present invention, since the sleeve portion and the displacement limiting member are formed at the outer end of the bulb sealing tube, the lamp is closed during the operation of the lamp. Even if components such as components or oxides thereof in the functionally gradient material constituting the body evaporate from the closed body,
As a result of a part of the sticking to the inner surface of the sleeve portion or the inner surface of the displacement limiting member, it is possible to suppress the evaporating substance from being released to the outside. Further, since the displacement limiting member through which the power supply member penetrates has a through-hole in which a minute clearance is generated between the power supply member and the power supply member, the manufacturing process of the lamp becomes extremely simple. No stress or the like is generated in the closed body during a measurement operation, an operation of incorporating the lamp into the reflecting mirror, or the like.

[Brief description of the drawings]

FIG. 1 shows a part of the configuration of a discharge lamp of the present invention.

FIG. 2 shows a part of the configuration of the discharge lamp of the present invention.

FIG. 3 shows a configuration of a conventional discharge lamp.

FIG. 4 shows a structure cited for the description of the invention.

FIG. 5 shows a part of the configuration of the filament lamp of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bulb 11 Arc tube part 12 Sealing tube part 13 Sleeve part 15 Filler 20 Closure body 30 Electrode rod 31 Electrode 40 Displacement restriction member 50 Support member

Claims (1)

[Claims] 1. A bulb having an arc tube portion and a sealing tube portion connected to both ends of the arc tube portion, and a cylindrical closing member disposed in the sealing tube portion. The closing body is made of a functionally graded material having an insulating portion on the inner end side and a conductive portion on the outer end side,
In a lamp, a sealing structure is formed by welding a sealing tube portion of the bulb to an insulating portion of the closing body, and a power supply member extends in an axial direction from an outer end of the closing body. A sleeve portion having an inner diameter larger than the outer diameter of the closing body is formed at each outer end of the sealing tube portion of the valve so as to extend outward in the axial direction. A displacement limiting member having a through hole is held on the inner surface of the sleeve portion, and a minute clearance is formed between the displacement limiting member and the power supply member.