JP2005056660A - High-pressure discharge lamp and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of a crack in a metalized layer by thermal shock in jointing a tubular member to an electrode introduction body; to reduce a sinking amount of a metal halide into a space between the tubular member and the electrode introduction body; and to prevent color temperature from changing in an initial stage, and initial lamp efficiency and initial luminous flux from degrading. <P>SOLUTION: This high-pressure discharge lamp is equipped with: the tubular members 15 jointed to openings 13a of a ceramic vessel 14 through the metalized layers 16; and the electrode introduction bodies 17 each having an electrode part 19 at a tip and jointed to the tubular members 15. A narrowed part 22 is formed between the opening 13a and a joint part 18 with the tubular member 15 jointed to the introduction body 17. The distance D<SB>1</SB>from an end face of the opening 13a to the joint part 18 is 7.0 mm or more; the distance d<SB>1</SB>from a tip of the electrode part 19 to the narrowed part 22 is 16.5 mm or less; and the maximum distance D<SB>2</SB>of a space between the tubular member 15 and the introduction body 17 in the narrowed part 22 is 0.04 mm or less. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a high-pressure discharge lamp and a method for manufacturing the same.

  In general, in a high pressure discharge lamp, particularly a metal halide lamp (ceramic metal halide lamp) having an arc tube having a ceramic container in which a metal halide is enclosed as a luminescent substance, an electrode having an electrode portion at the tip is introduced. As a method for sealing a body in a container, a method is used in which an electrode introduction body is inserted into the container and then sealed with a glass frit poured into a gap between the electrode introduction body and the container.

  This glass frit is susceptible to erosion by chemically reacting with the metal halide, particularly at high temperatures. Therefore, in order to keep the position of the glass frit away from the discharge space that is in a high temperature state during lighting, the container is composed of a main tube portion and a thin tube portion extending outward from the main tube portion, Glass frit is poured only into the end opposite to the main pipe (see, for example, Patent Document 1).

  However, since a slight gap is formed between the narrow tube portion and the electrode introduction body, the metal halide (mainly liquid metal halide) that is an enclosure sinks into this gap, and the metal contributes to the discharge. There remains a problem that the halide temperature decreases, the color temperature changes in the initial stage, and the initial lamp efficiency and the initial luminous flux decrease.

  The term “sinking” as used herein means that the metal halide does not return to the main pipe portion again after entering the gap between the thin tube portion and the electrode introduction body, but remains in that place. Say to be in a state.

  On the other hand, in recent years, in a ceramic metal halide lamp, in order to improve hermeticity and corrosion resistance against metal halides, a molybdenum cylindrical member is hermetically bonded to the opening of the container via a metallized layer, and this cylinder There has been proposed a sealing method in which an electrode introduction body is inserted into a cylindrical member, and the end portions of these cylindrical members and the electrode introduction body are welded with a laser or the like to be airtightly joined (see, for example, Patent Document 2). .

Since this sealing method has high corrosion resistance to metal halides, the length of the cylindrical member is shortened to reduce the volume of the gap formed between the cylindrical member and the electrode introduction body. It was expected to significantly reduce the amount of subsidence.
JP 57-78763 A Japanese Patent Laid-Open No. 2001-100385

  However, when a cylindrical member having a short length is used and the end portion of the cylindrical member and the electrode introduction body are welded by laser, a crack is generated in the metallized layer due to the thermal shock at that time, and as a result, leakage occurs. Happened.

  Therefore, it has been found that the length of the cylindrical member has to be increased, and the amount of sinking of the metal halide cannot be sufficiently reduced.

  The present invention has been made to solve such problems, and can prevent the metallized layer from cracking due to thermal shock when the cylindrical member and the electrode introduction body are joined in an airtight manner. The amount of metal halide sinking into the gap between the cylindrical member and the electrode introduction body can be greatly reduced, the color temperature can change at the initial stage, the initial lamp efficiency and the initial luminous flux can be reduced. An object of the present invention is to provide a high-pressure discharge lamp capable of preventing the

  Another object of the present invention is to provide a method for manufacturing a high-pressure discharge lamp that can prevent cracks in the metallized layer due to thermal shock when the tubular member and the electrode introduction body are hermetically bonded. To do.

The high-pressure discharge lamp according to claim 1 of the present invention is sealed in a ceramic container having a light emitting substance enclosed therein and having an opening, and is hermetically bonded to the opening via a metallization layer, and a part thereof. A metallic cylindrical member led out from the opening, and an electrode portion at the tip, and inserted into the cylindrical member so that the electrode portion is located in the container, A luminous tube having a part of the cylindrical member and an electrode introduction body that is airtightly joined to the tubular member, and a portion between the opening and the joint portion where the cylindrical member and the electrode introduction body are airtightly joined. In addition, a narrowed portion in which a gap between the cylindrical member and the electrode introduction body is narrowed, or a close contact portion in which the cylindrical member and the electrode introduction body are in close contact with each other is formed, distance D ₁ of the from the end face of the opening to the junction than 7.0mm There, the is at a distance d ₁ from the tip of the electrode portion to the narrowed portion or the contact portion is 16.5mm or less, perpendicularly to the stenosis or the contact portion with respect to the longitudinal axis of the tubular member in cut cross section, the maximum distance D ₂ of the gap between the tubular member and the electrode introducer has a configuration is less than 0.04 mm.

  With this configuration, it is possible to secure a sufficient distance between the metallized layer and the joint portion where the tubular member and the electrode introduction body are airtightly joined, so that the tubular member and the electrode introduction body are hermetically sealed. It is possible to prevent the metallized layer from cracking due to the thermal shock during bonding, and the metal halide sinks into the gap between the cylindrical member and the electrode introduction body beyond the constriction or adhesion portion. Can be prevented by the constricted portion or the close contact portion, so that the amount of sinking of the metal halide into the gap can be greatly reduced, resulting in a decrease in the metal halide contributing to the discharge. It is possible to prevent the color temperature from changing in the initial stage and the initial lamp efficiency and the initial luminous flux from being lowered. In addition, since the position of the constriction part or the close contact part is brought close to the electrode part and the temperature of the part during lighting is increased, the position of the constriction part or the close contact part in the gap between the cylindrical member and the electrode introduction body The metal halide that has entered the portion up to can be evaporated during lighting and contribute to the discharge again.

The high-pressure discharge lamp according to claim 2 of the present invention is sealed in a ceramic container having a light-emitting substance enclosed therein and having an opening, and is hermetically bonded to the opening via a metallization layer, and a part thereof. A metallic cylindrical member led out from the opening, and an electrode portion at the tip, and inserted into the cylindrical member so that the electrode portion is located in the container, An arc tube having a part of the tubular member and an electrode introduction body airtightly joined to the tubular member, and the tubular member is airtightly joined to the electrode introduction body at a portion other than the end opposite to the container. The distance d ₂ from the tip of the electrode part to the joined part where the cylindrical member and the electrode introduction body are hermetically joined is 16.5 mm or less.

  With this configuration, first, heat at the time of airtightly joining the tubular member and the electrode introduction body can be diffused to a portion of the tubular member opposite to the container with respect to the joint portion. . Secondly, when the tubular member and the electrode introduction body are joined in an airtight manner, for example, an evacuation device can be attached to the end of the tubular member. As a result, in a state where the pressure inside the container is lower than the pressure outside the container, it is possible to heat and melt the part other than the end on the opposite side of the cylindrical member. At that time, since the melted portion of the cylindrical member contracts instantaneously due to the pressure difference between the inside and outside of the container, the cylindrical member and the electrode introduction body can be joined in an airtight manner in a short time. Therefore, the amount of heat transferred to the metallized layer can be reduced, and cracks can be prevented from being generated in the metallized layer due to thermal shock when the cylindrical member and the electrode introduction body are joined in an airtight manner. In addition, since the position of the joint is close to the electrode part and the temperature of that part is increased during lighting, the metal halide that has entered the gap between the cylindrical member and the electrode introduction body evaporates during lighting. Therefore, it is possible to prevent the color temperature from changing in the initial stage and the initial lamp efficiency and the initial luminous flux from being reduced due to the decrease in the metal halide contributing to the discharge. be able to.

  According to a third aspect of the present invention, there is provided a method for manufacturing a high-pressure discharge lamp, wherein a luminescent material is sealed inside and a ceramic container having an opening is hermetically bonded to the opening via a metallization layer, and A metallic cylindrical member partially led out from the opening and an electrode portion at the tip, and inserted into the cylindrical member so that the electrode portion is located in the container And an arc tube having a part of the cylindrical member hermetically joined to the cylindrical member, and the cylindrical member is connected to the electrode introducing body at a portion other than the end opposite to the container. A method for manufacturing an airtightly bonded high pressure discharge lamp, wherein after the cylindrical member is airtightly bonded to the opening via a metallization layer, the pressure inside the cylindrical member is changed to the outside of the cylindrical member. The container among the cylindrical members in a state lower than the pressure of Uses a method for joining portions other than the opposite end heating, to melt, the said tubular member which is melted with the electrode introduced body airtight.

  By this method, when the tubular member and the electrode introduction body are joined in an airtight manner, the molten tubular member contracts due to the external pressure, so that the tubular member and the electrode introduction body can be joined in an airtight manner in an extremely short time. As a result, the production efficiency can be increased and the amount of heat transferred to the metallized layer through the cylindrical member can be greatly reduced, so that the metallized layer is prevented from cracking due to the thermal shock during the joining. can do. Further, when the tubular member and the electrode introduction body are joined in an airtight manner, for example, an evacuation sealing device is attached to the end of the tubular member, and the pressure inside the tubular member is lower than the pressure outside the tubular member. In this state, the cylindrical member is heated and melted except for the end opposite to the container, so that the container is in a hermetically sealed state, so that no impurities are mixed into the container. Therefore, since it is not necessary to perform the joining process in a special facility, it is possible to simplify the facility, to save labor for maintenance of the facility, and to reduce the cost. .

Furthermore, in the method for manufacturing a high-pressure discharge lamp according to claim 4 of the present invention, the length L ₁ from the joining portion of the cylindrical member to the electrode introduction body to the end opposite to the container is 7 mm or more. Is used.

  By this method, it is possible to prevent, for example, a chuck portion of an evacuation apparatus attached to the end portion of the cylindrical member from being deteriorated by heat when forming the joint portion.

  The high-pressure discharge lamp of the present invention has the above-described configuration, and can prevent cracks in the metallized layer due to thermal shock when the cylindrical member and the electrode introduction body are hermetically bonded. The amount of metal halide sinking into the gap between the member and the electrode introduction body can be greatly reduced, preventing changes in color temperature, initial lamp efficiency, and initial luminous flux. It is possible to provide a high-pressure discharge lamp that can be used.

  Moreover, the manufacturing method of the high-pressure discharge lamp of the present invention can prevent the metallized layer from being cracked by the thermal shock when the cylindrical member and the electrode introduction body are hermetically bonded by using the above method. In addition, it is possible to increase production efficiency in the joining process, and it is not necessary to perform the joining process in a special facility, so that the facility can be simplified and the maintenance of the facility is required. It is possible to provide a method of manufacturing a high-pressure discharge lamp that can save time and cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 2, the ceramic metal halide lamp with a rated power of 150 W for general indoor lighting according to the first embodiment of the present invention is closed at one end and attached with an E-shaped base 1 at the other end. In the outer tube 2 made of quartz glass or hard glass, the arc tube 3, the sleeve 4 made of quartz glass for preventing damage to the outer tube 2 covering almost the entire arc tube 3, and the arc tube 3 Two stem wires that are connected to an external lead wire 5 that is led out to the outside to hold the arc tube 3 and are sealed to a stem 6 that is sealed to the other end of the outer tube 2 7 and two ring-shaped members 8 that are connected to one of the stem wires 7 and are respectively wound around both ends of the sleeve 4 to hold the sleeve 4 are accommodated.

  Nitrogen gas is sealed in the outer tube 2.

As shown in FIG. 1 or 3, the arc tube 3 includes a first tube portion 9 having an inner diameter r ₁ of 10.7 mm, and a second tube portion 11 formed on the first tube portion 9 via a taper portion 10. And an outer diameter R ₁ inserted into each second cylinder portion 11 and shrink-fitted is 3.4 mm, an inner diameter r ₂ is 1.3 mm, and a length L ₁ (second cylinder portion). 11 is provided with a container 14 made of translucent ceramic made of alumina, for example, having a narrow tube portion 13 having a projection length of 6.0 mm.

A region surrounded by each component of the container 14 forms a discharge space, in which a predetermined amount of a metal halide as a luminescent material, mercury as a buffer gas, and a rare gas as a starting aid are enclosed. ing. The tube wall load is 24 W / cm ² .

Further, in the opening portion of the container 14, that is, the opening portion 13a of each narrow tube portion 13, a metal cylindrical member 15 such as molybdenum or tungsten, a part of which is led out from the opening portion 13a, is a metallized layer. 16 is joined airtightly. The cylindrical member 15 has an outer diameter of 1.2 mm, a thickness of 0.1 mm, a protruding length L _m from the end surface of the opening 13a of the narrow tube portion 13, that is, a tube from the end surface of the opening 13a of the narrow tube portion 13. A distance D ₁ to the joint 18 between the electrode-like member 15 and the electrode introduction body 17 described later is 7.0 mm or more.

Incidentally, the protruding length L _m (distance D ₁₎ is measured the distance to the end opposite to the container 14 of the joint portion 18 of the electrode introducer 17 to be described later and tubular member 15 from the end face.

Metallization layer 16 is made of a metal sintered body of molybdenum having open pores, Dy ₂ to its open pore dysprosium oxide in (Dy ₂ O ₃₎ and aluminum oxide (Al ₂ O ₃₎ and composed mainly of It is impregnated with O ₃ —Al ₂ O ₃ glass and has a thickness of 50 μm to 100 μm. Also, metallization layer 16 in order to obtain a high airtightness, it is preferable that length L ₂ is formed for more than 3 mm.

  Further, as shown in FIG. 3, the arc tube 3 has an electrode portion 19 at the tip portion, and is inserted into the cylindrical member 15 so that the electrode portion 19 is located in the container 14. The portion includes a cylindrical member 15 and an electrode introduction body 17 airtightly joined.

  These electrode introduction bodies 17 have their longitudinal central axes located on substantially the same axis so that the electrode portions 19 face each other. The distance between the electrode parts 19 is 10.0 mm.

  The electrode introduction body 17 includes a tungsten electrode rod 20 having a diameter of 0.5 mm, and a tungsten coil portion 21 that is wound around one end of the electrode rod 20 to form the electrode portion 19. And a coil part 21 made of molybdenden with a wire diameter of 0.2 mm wound around a portion excluding both ends of the electrode rod 20, and the other end of the electrode rod 20 is led out from the cylindrical member 15 to the outside. ing.

  Although the coil portion 21 is in close contact with the electrode rod 20, it is not in close contact with the inner surface of the cylindrical member 15, and therefore the dimensional configuration of each member is also between the cylindrical member 15 and the coil portion 21. Considering this, a slight gap of 0.06 mm to 0.14 mm is formed. However, when the electrode introduction body 17 is inserted eccentrically into the cylindrical member 15, a part of the coil portion 21 may contact (adhere) the inner surface of the cylindrical member 15.

  Although not shown, an external lead wire 5 made of niobium, molybdenum or the like is connected to an end portion of the electrode introduction body 17 that is led out from the cylindrical member 15 to the outside.

  Further, in the electrode introduction body 17 described above, the case where the electrode rod 20 is made of a single tungsten rod has been described. However, this electrode rod is, for example, one in which a plurality of tungsten rods are joined or only at the end on the container 14 side. May be made of a tungsten rod, and the remainder may be made of, for example, a molybdenum rod or a conductive cermet rod bonded to the tungsten rod.

  The gap between the tubular member 15 and the electrode introduction body 17 is narrowed between the opening 13a of the thin tube portion 13 and the joint portion 18 where the tubular member 15 and the electrode introduction body 17 are airtightly joined. A narrowed portion 22 is formed.

The distance d ₁ from the tip of the electrode part 19 to the narrowed part 22 is 16.5 mm or less. Further, as shown in FIG. 4, the maximum distance of the gap between the cylindrical member 15 and the electrode introduction body 17 in a cross section obtained by cutting the narrowed portion 22 perpendicularly to the longitudinal axis of the cylindrical member 15. D ₂ is less than 0.04 mm (however, not including 0 mm).

Instead of the narrowed portion 22 described above, a close contact portion may be formed in which a part of them closely contacts so that there is no gap between the cylindrical member 15 and the electrode introduction body 17. At that time, the maximum distance D ₂ is 0 mm.

Further, when the coil portion 21 is wound roughly around the electrode rod 20, the maximum distance D ₂ of the gap between the tubular member 15 and the electrode introduction body 17 is substantially equal to the inner surface of the tubular member 15. This is the distance between the outer surface of the electrode rod 20.

  Next, an example of a method for manufacturing such a ceramic metal halide lamp will be described.

  First, the cylindrical member 15 is hermetically bonded to the opening of the container 14, that is, the opening 13 a of the thin tube portion 13 through the metallized layer 16, and two electrode introduction bodies 17 are prepared in advance.

  One electrode introduction body 17 is inserted into one cylindrical member 15 and held in a state where the electrode portion 19 is located in the container 14. After that, the end of one cylindrical member 15 is melted by applying a laser, and the molten cylindrical member 15 and the electrode introduction body 17 are joined to form one joined portion 18.

  Next, after the inside of the container 14 is evacuated from the other cylindrical member 15, an enclosure such as a luminescent substance is put into the container 14 from the other cylindrical member 15. Thereafter, another electrode introduction body 17 is inserted into the other cylindrical member 15 and held in a state where the electrode portion 19 is located in the container 14. Subsequently, the end of the other cylindrical member 15 is melted by applying a laser, and the molten cylindrical member 15 and the electrode introduction body 17 are joined to form the other joined portion 18.

  Then, for example, by applying a laser to the predetermined portion between the opening of the thin tube portion 13 and the joint portion 18 where the tubular member 15 and the electrode introduction body 17 are airtightly joined, the diameter is reduced. A narrowed portion 22 is formed in which the gap between the electrode member 15 and the electrode introduction body 17 is narrowed. At this time, a part of the inner surface of the cylindrical member 15 and a part of the coil portion 21 of the electrode introduction body 17 may be in contact with each other, and a gap between the cylindrical member 15 and the electrode introduction body 17 is formed. The contact portion may be formed by bringing the inner surface of the cylindrical member 15 and the coil portion 21 of the electrode introduction body 17 into close contact with each other so as to disappear.

  The case where the narrow member 22 or the close contact portion is formed by applying a laser to reduce the diameter of the cylindrical member 15 has been described. However, in addition to this, the narrow portion 22 or the narrow portion 22 or the close contact portion may be formed by mechanical processing such as caulking. A close contact portion may be formed.

  Next, the effects of the ceramic metal halide lamp (hereinafter referred to as “the product 1 of the present invention”) having a rated power of 150 W, which is the first embodiment of the present invention, were confirmed.

First, in the product 1 of the present invention, the distance D ₁ from the end surface of the opening 13a of the narrow tube portion 13 to the joint portion 18 is 12.5 mm (Example 1), 7.0 mm (Example 2), and 6.5 mm ( Comparative Example 1) and variously changed ones were prepared.

  Then, when the cylindrical member 15 and the electrode introduction body 17 were joined by laser in each of the produced lamps, it was confirmed whether or not a crack was generated in the metallized layer 16, and the results shown in Table 1 were obtained. It was.

In each example and comparative example, the distance d ₁ from the tip of the electrode portion 19 to the narrowed portion 22 was 13.0 mm, and the narrowed portion 22 was cut perpendicular to the longitudinal axis of the cylindrical member 15. in cross section, the maximum distance D ₂ of the gap between the tubular member 15 and the electrode transductant 17 was 0.02 mm.

  As is apparent from Table 1, in Examples 1 and 2, there was no crack in the metallized layer 16 when the tubular member 15 and the electrode introduction body 17 were joined by heating and melting. .

  On the other hand, in Comparative Example 1, cracks occurred in the metallized layer 16 when the tubular member 15 and the electrode introduction body 17 were heated, melted, and joined.

  The reason why such a result was obtained was examined.

  In the case of Example 1 and Example 2, since the distance between the part which joins the cylindrical member 15 and the electrode introducing body 17 and the metallization layer 16 is fully separated, the cylindrical member 15 and the electrode introduction Even when the body 17 is heated and melted and joined, the heat at that time is hardly transmitted to the metallized layer 16, and as a result, the thermal shock generated in the metallized layer 16 is considered to be small. On the other hand, in the case of the comparative example 1, since the distance between the part which joins the cylindrical member 15 and the electrode introducing body 17 and the metallization layer 16 is short, the cylindrical member 15 and the electrode introducing body 17 are heated. The thermal shock at the time of melting and joining is large, and as a result, it is considered that cracks occurred in the metallized layer 16 due to the thermal shock.

Therefore, in order to prevent the metallized layer 16 from being cracked by thermal shock when joining the cylindrical member 15 and the electrode introduction body 17, the distance D ₁ from the end face of the opening of the thin tube portion 13 to the joint portion 18. It was found that should be specified to be 7 mm or more.

Although the upper limit value of the distance D ₁ is not particularly defined, it is preferable that the distance D ₁ is as short as possible in consideration of the compactness of the lamp.

Next, in the product 1 of the present invention, the distance D ₁ from the end face of the opening of the narrow tube portion 13 to the joint portion 18 is 12.5 mm, and the position of the narrowed portion 22, that is, the tip of the electrode portion 19 to the narrowed portion 22 Five pieces with various changes of the distance d ₁ of 13.0 mm (Example 1), 16.5 mm (Example 3), and 17.0 mm (Comparative Example 2) were prepared.

  Each of the produced lamps was examined for color temperature variation, initial lamp efficiency (lm / W), and initial luminous flux (lm) after 100 hours of lighting, and the results shown in Table 2 were obtained.

  The “initial light beam” indicates a light beam after 100 hours of lighting. “Initial lamp efficiency” indicates the lamp efficiency after 100 hours of lighting.

Further, in each lamp, the maximum distance D ₂ of the gap between the cylindrical member 15 and the electrode introduction body 17 is 0 in a cross section in which the narrowed portion 22 is cut perpendicular to the longitudinal axis of the cylindrical member 15. 0.02 mm.

  Further, as an evaluation standard, “color temperature variation” is 3500K as a reference value, ± 200K or less as “good”, those exceeding ± 200K as “bad”, and initial lamp efficiency of 90 lm / W or more as “good”. “Good”, less than 90 lm / W is “bad”, and the initial luminous flux is 13500 lm or more is “good”, and less than 13500 lm is “bad”.

  As apparent from Table 2, in Example 1, the color temperature variation is ± 150K, the initial lamp efficiency is 93.3 lm / W, the initial luminous flux is 14000 lm, and in Example 3, the color temperature variation is ± 200 K. The initial lamp efficiency was 90.0 lm / W and the initial luminous flux was 13500 lm, and the above evaluation criteria were satisfied in any of the examples.

  On the other hand, in Comparative Example 2, the color temperature variation was ± 220 K, the initial lamp efficiency was 89.3 lm / W, and the initial luminous flux was 13400 lm, and none of the above evaluation criteria was satisfied.

  The reason why such a result was obtained was examined.

In both Example 1 and Example 3, the metal halide can be prevented from sinking into the gap between the tubular member 15 and the electrode introduction body 17 beyond the constriction 22 by the constriction 22 itself. In addition, since the distance d ₁ from the tip of the electrode part 19 to the constricted part 22 is short and the constricted part 22 is brought close to the electrode part 19 that becomes high temperature during lighting, the metal halide is in the cylindrical member 15 and the electrode introduction body 17. The metal halide can be evaporated during lighting even if it enters the portion up to the position of the constriction 22 in the gap between the cylindrical member 15 and the electrode introduction body 17. This is probably because the sinking amount of the metal halide into the gaps of the metal can be greatly reduced.

On the other hand, in Comparative Example 2, although it is possible to prevent the metal halide from entering the gap between the cylindrical member 15 and the electrode introduction body 17 beyond the constricted portion 22, the tip of the electrode portion 19 can be prevented. Since the distance d ₁ from the narrowed portion 22 to the narrowed portion 22 is long, a part of the metal halide that has entered the portion up to the narrowed portion 22 in the gap between the cylindrical member 15 and the electrode introduction body 17 is turned on. It is thought that it was because it stayed in the place without evaporating.

Next, in the product 1 of the present invention, the distance D ₁ from the end face of the opening of the thin tube portion 13 to the joint portion 18 is 12.5 mm, and the distance d ₁ from the tip of the electrode portion 19 to the constricted portion 22 is 13. In the case of 0 mm, the maximum distance D ₂ of the gap between the cylindrical member 15 and the electrode introduction body 17 in a cross section obtained by cutting the narrowed portion 22 perpendicularly to the longitudinal axis of the cylindrical member 15 is set to 0. Five pieces with various changes of 02 mm (Example 1), 0.04 mm (Example 4), and 0.05 mm (Comparative Example 3) were produced.

  Each of the produced lamps was examined for color temperature variation, initial lamp efficiency (lm / W), and initial luminous flux (lm) after 100 hours of lighting, and the results shown in Table 3 were obtained.

  As apparent from Table 3, in Example 1, the color temperature variation is ± 150K, the initial lamp efficiency is 93.3 lm / W, the initial luminous flux is 14000 lm, and in Example 4, the color temperature variation is ± 200 K. The initial lamp efficiency was 90.0 lm / W and the initial luminous flux was 13500 lm, and the above evaluation criteria were satisfied in any of the examples.

  On the other hand, in Comparative Example 3, the color temperature variation was ± 250 K, the initial lamp efficiency was 88.0 lm / W, and the initial luminous flux was 13200 lm, and none of the above evaluation criteria was satisfied.

  The reason why such a result was obtained was examined.

  In each of Example 1 and Example 4, the minimum area S of the void portion in the cross section obtained by cutting the constricted portion 22 perpendicularly to the longitudinal axis of the cylindrical member 15 is sufficiently small, so that the metal halide is constricted. This is considered to be because it was possible to sufficiently prevent the portion 22 from passing through the gap between the tubular member 15 and the electrode introduction body 17.

  On the other hand, in Comparative Example 3, although there is a narrowed portion, the minimum area S of the void portion in the cross section obtained by cutting the narrowed portion perpendicular to the longitudinal axis of the cylindrical member 15 is large, and the metal halide has the narrowed portion. It is thought that this is because it has passed and entered the gap between the cylindrical member 15 and the electrode introduction body 17.

Therefore, in order to prevent the metal halide from sinking into the gap between the cylindrical member 15 and the electrode introduction body 17, the distance d ₁ from the tip of the electrode portion 19 to the narrowed portion 22 is set to 16.5 mm or less, In addition, the maximum distance D ₂ of the gap between the cylindrical member 15 and the electrode introduction body 17 in a cross section obtained by cutting the narrowed portion 22 perpendicularly to the longitudinal axis of the cylindrical member 15 is defined to be 0.04 mm or less. I knew it should be.

The distance d ₁ is preferably as short as possible, and the maximum distance D ₂ is as small as possible. The lower limit value of the distance d ₁ is appropriately determined depending on the dimensions of the container 14 and the like.

  As described above, according to the configuration of the ceramic metal halide lamp according to the first embodiment of the present invention, the metallized layer 16 and the joint portion 18 in which the tubular member 15 and the electrode introduction body 17 are airtightly joined. Since a sufficient distance can be secured between the metallized layer 16 and the metallized layer 16 due to thermal shock when the cylindrical member 15 and the electrode introduction body 17 are hermetically bonded, Since the narrow portion 22 can prevent the halide from sinking into the gap between the cylindrical member 15 and the electrode introduction body 17 beyond the narrow portion 22, the sinking amount of the metal halide into the gap is prevented. As a result, the color temperature changes due to the decrease in metal halide contributing to the discharge, the initial lamp efficiency and the initial luminous flux decrease. That it can be prevented. Further, since the position of the constricted portion 22 is brought close to the electrode portion 19 and the temperature of the portion during lighting is increased, the gap between the cylindrical member 15 and the electrode introduction body 17 is reached to the position of the constricted portion 22. The metal halide that has entered this portion can be evaporated during lighting and contribute to the discharge again.

  In the first embodiment, the tubular member 15 and the electrode are provided between the opening 13a of the thin tube portion 13 and the joint 18 in which the tubular member 15 and the electrode introduction body 17 are airtightly joined. Although the case where the narrowed portion 22 having a narrow gap with the introduction body 17 is formed has been described, the cylindrical member 15 and the electrode introduction body 17 are in close contact with each other in place of the narrowed portion 22. Even when the portion is formed, the same effect as described above can be obtained.

Next, the ceramic metal halide lamp with a rated power of 150 W for general indoor lighting according to the second embodiment of the present invention does not have the narrowed portion 22 as shown in FIG. The position of the joint portion with the body 17 is different, that is, the tubular member 15 is airtightly joined to the electrode introduction body 17 at a portion other than the end portion on the side opposite to the container 14, and is tubular from the tip of the electrode portion 19. The first embodiment of the present invention is general except that the distance d ₂ to the joint 23 where the member 15 and the electrode introduction body 17 are hermetically joined is 16.5 mm or less, for example, 13.0 mm. It has the same configuration as a ceramic metal halide lamp with a rated power of 150 W for indoor lighting.

The distance d ₂ is preferably as short as possible, and the lower limit is appropriately determined depending on the dimensions of the container 14 and the like.

The length L ₃ from the end face of the opening 13a of the thin tube portion 13 to the joint portion 23 is 4.5 mm. Further, the protruding length L _m of the tubular member 15 from the end face of the opening 13a of the tube portion 13 is 15.0 mm.

  Next, an example of the manufacturing method of the ceramic metal halide lamp which is the 2nd Embodiment of this invention is shown.

  First, the cylindrical member 15 is hermetically bonded to the opening of the container 14, that is, the opening 13 a of the thin tube portion 13 through the metallized layer 16, and two electrode introduction bodies 17 are prepared in advance.

  One electrode introduction body 17 is inserted into one cylindrical member 15 and held in a state where the electrode portion 19 is located in the container 14. At this time, the end of the other cylindrical member 15 is closed, and the inside of the container 14 is evacuated from the opening of the one cylindrical member 15. Thereafter, in the argon atmosphere at atmospheric pressure, the cylindrical member 15 is melted by applying a laser at a position 4.5 mm from the end face of the opening 13a of the thin tube portion 13 and uses the pressure difference between the inside and outside of the cylindrical member 15. Then, the melted tubular member 15 is contracted and joined to the tubular member 15 and the electrode introduction body 17 to form one joining portion 23.

  Next, another electrode introduction body 17 is inserted into the other cylindrical member 15 and held in a state where the electrode portion 19 is located in the container 14. Further, a vacuum exhaust sealing device (not shown) is attached to the end portion of the other cylindrical member 15, and after the inside of the container 14 is evacuated, an inclusion such as a luminescent substance is put into the container 14 from the other cylindrical member 15. Is input. At this time, argon gas is introduced as a starting assisting rare gas so that the pressure in the container 14 is about 13 kPa. Next, in an argon atmosphere at atmospheric pressure, the cylindrical member 15 is melted by applying a laser at a position 4.5 mm from the end face of the opening 13a of the narrow tube portion 13 and uses the pressure difference between the inside and outside of the tubular member 15. The tubular member 15 thus melted is contracted to join the tubular member 15 and the electrode introduction body 17 to form the other joining portion 23.

  When the joining part 23 is formed by applying a laser to the cylindrical member 15, it is performed in an argon atmosphere to prevent each member from being oxidized.

In order to prevent the chuck portion (not shown) of the vacuum exhaust sealing device attached to the end of the cylindrical member 15 from being deteriorated by heat when forming the joint portion 23, an electrode is introduced in the cylindrical member 15. It is preferable that the length L ₄ from the part to be joined to the body 17 to the end opposite to the container 14 is 7 mm or more.

  According to the above configuration of the ceramic metal halide lamp according to the second embodiment of the present invention, the heat generated when the cylindrical member 15 and the electrode introduction body 17 are hermetically bonded is bonded to the cylindrical member 15. The portion 23 can be diffused to a portion opposite to the container 14. In addition, when the tubular member 15 and the electrode introduction body 17 are joined in an airtight manner, an evacuation device can be attached to the end of the tubular member 15, so that the pressure inside the container 14 is changed to the pressure outside the container 14. In the state where it is lowered, the portion of the cylindrical member 15 other than the end opposite to the container 14 can be heated and melted. In this case, the molten portion of the cylindrical member 15 is inside and outside the container 14. Therefore, the tubular member 15 and the electrode introduction body 17 can be joined in an airtight manner in a very short time. As a result, the amount of heat transmitted to the metallized layer 16 can be reduced, and the metallized layer 16 can be prevented from cracking due to thermal shock when the cylindrical member 15 and the electrode introduction body 17 are joined in an airtight manner. it can. In addition, since the position of the joint portion 23 is brought close to the electrode portion 19 and the temperature of the portion during lighting is increased, the metal halide that has entered the gap between the cylindrical member 15 and the electrode introduction body 17 is removed. Since it can be evaporated during lighting and contribute to the discharge again, it is possible to prevent the color temperature from changing and the initial lamp efficiency and the initial luminous flux from being reduced due to the decrease in metal halide contributing to the discharge. can do.

  Further, according to the method for manufacturing a ceramic metal halide lamp according to the second embodiment of the present invention, when the tubular member 15 and the electrode introduction body 17 are joined in an airtight manner, the molten tubular member 15 is contracted by an external pressure. Therefore, the cylindrical member 15 and the electrode introduction body 17 can be hermetically joined in an extremely short time, and as a result, the production efficiency can be increased, and the amount of heat transferred to the metallized layer 16 through the cylindrical member 15 can be increased. Since it can be greatly reduced, it is possible to prevent the metallized layer 16 from being cracked by the thermal shock during the joining. In addition, when the cylindrical member 15 and the electrode introduction body 17 are joined in an airtight manner, a vacuum exhaust sealing device is attached to the end of the cylindrical member 15, and the pressure inside the cylindrical member 15 is adjusted to the outside of the cylindrical member 15. Since the portion of the cylindrical member 15 other than the end opposite to the container 14 is heated and melted in a state lower than the pressure, impurities are not mixed into the container 14. Therefore, since it is not necessary to perform the joining process in a special facility, it is possible to simplify the facility, to save labor for maintenance of the facility, and to reduce the cost. .

  In each of the above-described embodiments, the container 14 having the main tube portion 12 and the two thin tube portions 13 including the first tube portion 9, the two tapered portions 10, and the two second tube portions 11 is described as an example. However, the present invention is not limited to the shape and dimensions of the container, and includes a container having at least one opening, such as a container having a spherical main tube part or a container not having the thin tube part 13. The present invention can also be applied to a high pressure discharge lamp. However, the effect is remarkably exhibited when applied to a high-pressure discharge lamp provided with a container having a thin tube portion 13.

  In each of the above embodiments, the case where the present invention is applied to a ceramic metal halide lamp with a rated power of 150 W has been described. However, the present invention is not limited to this, and a high pressure such as a ceramic metal halide lamp with a rated power of 20 W to 400 W or a high pressure sodium lamp is used. It can also be applied to a discharge lamp.

  The high-pressure discharge lamp of the present invention prevents the metallized layer from cracking due to thermal shock when the cylindrical member and the electrode introduction body are joined in an airtight manner, and to the gap between the cylindrical member and the electrode introduction body. For applications such as discharge lamps that significantly reduce the sinking amount of metal halides and prevent the color temperature from changing at the initial stage and preventing the initial lamp efficiency and initial luminous flux from decreasing. Can also be applied.

  In addition, the method for manufacturing a high-pressure discharge lamp according to the present invention is a method for manufacturing a discharge lamp in which it is necessary to prevent the metallized layer from cracking due to thermal shock when the cylindrical member and the electrode introduction body are joined in an airtight manner. It can also be applied to other uses.

Front sectional view of the arc tube of the ceramic metal halide lamp according to the first embodiment of the present invention Similarly, a partially cutaway front view of a ceramic metal halide lamp Similarly, an enlarged sectional view of the main part of a ceramic metal halide lamp Sectional view of the AA line of FIG. The principal part expanded sectional view of the ceramic metal halide lamp which is the 2nd Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Outer tube 3 Light emission tube 4 Sleeve 5 External lead wire 6 Stem 7 Stem wire 8 Ring-shaped member 9 1st cylinder part 10 Tapered part 11 2nd cylinder part 12 Main pipe part 13 Narrow tube part 13a Opening part 14 Container 15 Tube Shaped member 16 Metallized layer 17 Electrode introduction body 18, 23 Joint portion 19 Electrode portion 20 Electrode rod 21 Coil portion 22 Narrowed portion

Claims (4)

A ceramic container in which a luminescent material is enclosed and having an opening, and a metal cylinder that is hermetically bonded to the opening via a metallization layer and a part of which is led out from the opening A member and an electrode portion at a tip portion, and the electrode portion is inserted into the tubular member so as to be located in the container, and a part thereof is airtightly joined to the tubular member. An arc tube having an electrode introduction body,
A narrowed portion in which a gap between the tubular member and the electrode introduction body is narrowed between the opening and a joint portion where the tubular member and the electrode introduction body are airtightly joined, or A close contact portion is formed in which the cylindrical member and the electrode introduction body are in close contact with each other,
The distance D ₁ from the end face of the opening to the joint is 7.0 mm or more,
The distance d ₁ from the tip of the electrode part to the narrowed part or the close contact part is 16.5 mm or less,
In section cut perpendicular to the stenosis or the contact portion with respect to the longitudinal axis of the tubular member, the maximum distance D ₂ of the gap between the tubular member and the electrode introducer is 0.04mm A high-pressure discharge lamp characterized by: A ceramic container in which a luminescent material is enclosed and having an opening, and a metal cylinder that is hermetically bonded to the opening via a metallization layer and a part of which is led out from the opening A member and an electrode portion at a tip portion, and the electrode portion is inserted into the tubular member so as to be located in the container, and a part thereof is airtightly joined to the tubular member. An arc tube having an electrode introduction body,
The cylindrical member is airtightly joined to the electrode introduction body at a portion other than the end opposite to the container,
A high-pressure discharge lamp, wherein a distance d ₂ from a tip of the electrode part to a joint part where the tubular member and the electrode introduction body are airtightly joined is 16.5 mm or less. A ceramic container in which a luminescent material is enclosed and having an opening, and a metal cylinder that is hermetically bonded to the opening via a metallization layer and a part of which is led out from the opening A member and an electrode portion at a tip portion, and the electrode portion is inserted into the tubular member so as to be located in the container, and a part thereof is airtightly joined to the tubular member. An arc tube having an electrode introduction body, wherein the cylindrical member is a method for producing a high pressure discharge lamp hermetically bonded to the electrode introduction body at a portion other than the end opposite to the container,
After the cylindrical member is hermetically bonded to the opening through the metallization layer, the pressure in the cylindrical member is lower than the pressure outside the cylindrical member, A method for manufacturing a high-pressure discharge lamp, comprising heating and melting a portion other than the end opposite to the container, and hermetically joining the molten tubular member and the electrode introduction body. Method for manufacturing a high pressure discharge lamp according to claim 3, wherein the the said container from joint scheduled portion with the electrode introducer in said tubular member length L ₁ to the opposite end is 7mm or more .

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