JP2003234067A - High pressure discharge lamp, method for manufacturing the same and lamp unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a high pressure discharge lamp which has a high pressure withstand strength. <P>SOLUTION: The manufacturing method for the high pressure discharge lamp has an arc tube and a sealing part, which comprises the steps of preparing a glass pipe 80 for the discharge lamp having an arc tube part 1' and a side tube 2' constituting the arc tube of the high pressure discharge lamp, inserting in the side tube 2' a glass member 70 composed of a second glass with a softening point lower than that of a first glass constituting the side tube 2', adhering the glass member 70 to the side tube 2' by heating the side tube 2', and then heating a part including at least the glass member 70 and the side tube 2' at a temperature higher than the strain-temperature of the second glass and lower than that of the first glass. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a high pressure discharge lamp, a high pressure discharge lamp and a lamp unit. In particular, the present invention relates to a method for manufacturing a high-pressure discharge lamp used for applications such as general lighting and a reflector in combination with a projector and a headlight of an automobile.

[0002]

2. Description of the Related Art In recent years, image projection devices such as liquid crystal projectors and DMD projectors have been widely used as a system for realizing a large-screen image. In such image projection devices, a high-pressure discharge lamp showing high brightness is generally used. Widely used. The structure of a conventional high pressure discharge lamp 1000 is schematically shown in FIG. The lamp 100 shown in FIG.
Reference numeral 0 is a so-called ultra-high pressure mercury lamp, which is disclosed in Patent Document 1, for example.

The lamp 1000 has an arc tube (bulb) 101 made of quartz glass, and a pair of sealing parts (seal parts) 102 extending from both ends of the arc tube 101. A light emitting substance (mercury) 106 is enclosed inside the discharge tube 101 (discharge space), and a pair of tungsten electrodes (W electrodes) 10 made of tungsten is used.
3 are arranged so as to face each other at regular intervals. One end of the W electrode 103 is welded to a molybdenum foil (Mo foil) 104 in the sealing portion 102,
And Mo foil 104 are electrically connected. Mo foil 1
An external lead (Mo rod) 105 made of molybdenum is electrically connected to one end of 04. In addition to mercury 106, argon (A
r) and a small amount of halogen are also encapsulated.

The operating principle of the lamp 1000 will be briefly described. W through the external lead 105 and the Mo foil 104.
When a starting voltage is applied between the electrodes 103, 103, discharge of argon (Ar) occurs, the temperature in the discharge space of the arc tube 101 rises due to this discharge, and the mercury 106 is heated and vaporized. Then, the W electrodes 103, 1
Mercury atoms are excited and emit light at the center of the arc between 03. The higher the mercury vapor pressure of the lamp 1000 is, the more the emitted light is. Therefore, the higher the mercury vapor pressure is, the more suitable it is as a light source of the image projection apparatus, but from the viewpoint of the physical pressure resistance of the arc tube 110, the pressure is 15 to 20 MPa (150 MPa). The lamp 1000 is used with mercury vapor pressures in the range of ~ 200 atmospheres).

As a related document, there is Patent Document 2 described later.

[0006]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2-148561

[Patent Document 2] Japanese Patent Laid-Open No. 2001-23570

[0007]

The conventional lamp 10 described above is used.
00 has a withstand pressure strength of about 20 MPa, but research and development have been conducted to further improve the withstand pressure strength in order to further improve the lamp characteristics (see, for example, Patent Document 2). In order to realize a higher performance image projection apparatus, a lamp with higher output and higher power is required today, and a lamp with higher pressure resistance is required to meet this requirement. Because.

To explain further, in the case of a high-power / high-power lamp, in order to suppress the evaporation of the electrode from accelerating with an increase in current, more mercury than usual is sealed in the lamp voltage. Need to be higher. If the amount of enclosed mercury is insufficient for the lamp power, the lamp voltage cannot be raised to the required level, and the lamp current will increase, resulting in rapid evaporation of the electrodes, making it a practical lamp. Can not. In other words, from the viewpoint of realizing a high-output lamp, it is sufficient to increase the lamp power and to make a short arc type lamp with an electrode distance that is even shorter than that of the conventional one. In order to manufacture a high-output / high-power lamp, it is necessary to improve the pressure resistance and increase the amount of enclosed mercury. And with today's technology, with extremely high compressive strength (for example, about 30 MPa or more),
A practical high-pressure discharge lamp has not yet been realized.

The present invention has been made in view of the above points, and a main object of the present invention is to provide a method of manufacturing a high pressure discharge lamp having higher pressure resistance strength than conventional high pressure discharge lamps.

[0010]

A first method for manufacturing a high pressure discharge lamp according to the present invention has a light emitting tube in which a light emitting material is enclosed, and a sealing portion for maintaining the airtightness of the light emitting tube. A method for manufacturing a high-pressure discharge lamp, the step of preparing a glass tube for a discharge lamp, comprising: an arc tube part which becomes an arc tube of the high-pressure discharge lamp; and a side tube part extending from the arc tube part; A glass member made of a second glass having a softening point lower than that of the first glass forming the tube is inserted into the side tube, and then the side tube is heated to heat the glass member and the side. After the step of bringing the tube portion into close contact and the step of bringing into close contact, the glass member and the above-mentioned glass member and the above-mentioned glass are at temperatures higher than the strain point temperature of the second glass and lower than the strain point temperature of the first glass. Step of heating a portion including at least a side tube portion Encompasses.

In a preferred embodiment, the glass
The material is 15% by weight or less of Al₂O₃ And 4% by weight or less
At least one of B and SiO₂Mo consisting of
It is a lath tube or a glass plate.

A second method for manufacturing a high pressure discharge lamp according to the present invention is a method for manufacturing a high pressure discharge lamp having a light emitting tube in which a light emitting material is enclosed, and a pair of sealing portions extending from both ends of the light emitting tube. A method of preparing a glass tube for a discharge lamp having an arc tube part to be an arc tube of a high pressure discharge lamp, and a pair of side tube parts extending from both ends of the arc tube part; On one side pipe part of the side pipe part,
A glass tube made of a second glass having a lower softening point than the first glass forming the side tube portion and an electrode structure including at least an electrode rod are inserted, and then the side tube portion is heated. Contracting to form one sealing part of the pair of sealing parts; and after forming the one sealing part, introducing a luminescent substance into the arc tube part; After introducing the luminescent substance, a glass tube composed of the second glass and an electrode structure including at least an electrode rod are inserted into the other side tube portion with respect to the one side, and then the side tube portion is inserted. The step of forming a light-emitting tube in which the other sealing portion and the light-emitting substance are sealed by heat-shrinking, and the completed lamp body in which both the sealing portion and the light-emitting tube are formed, Than the strain point temperature of the second glass In There temperatures encompassing, and, at the first temperature lower than the strain point temperature of the glass, and heating at least includes a portion of the glass tube and the side tube portion.

The heating step is preferably performed for 2 hours or more.

The heating step may be performed for 100 hours or more.

In a preferred embodiment, the heating causes the glass tube, a boundary portion between the glass tube and the side tube portion, a portion of the glass tube on the side of the side tube portion, and the side tube. A compressive stress of about 10 kgf / cm ² or more and about 50 kgf / cm ² or less is generated in a portion selected from the group consisting of the portion on the glass tube side of the portion in at least the longitudinal direction of the side tube portion.

In a preferred embodiment, the compressive stress is generated in each of the pair of sealing parts.

In a preferred embodiment, the heating is performed by placing the completed lamp in a furnace having a temperature higher than a strain point temperature of the second glass and lower than a strain point temperature of the first glass. It is executed by doing.

The inside of the furnace is preferably in a vacuum or reduced pressure state.

In a preferred embodiment, the first glass contains 99% by weight or more of SiO _2, and the second glass contains 15% by weight or less of Al ₂ O ₃ and 4% by weight or less of B. At least one of them and SiO ₂ is included.

In a preferred embodiment, the high-pressure discharge lamp is a high-pressure mercury lamp, and the mercury is used as the luminescent substance, and the amount of the mercury is 150 mg / min based on the inner volume of the arc tube.
Enclose at least cm ³ .

It is preferable that mercury is filled as the luminescent substance in an amount of 220 mg / cm ³ or more based on the internal volume of the arc tube.

Mercury may be enclosed as the luminescent substance in an amount of 300 mg / cm ³ or more based on the internal volume of the arc tube.

A third method for manufacturing a high-pressure discharge lamp according to the present invention is a method for manufacturing a high-pressure discharge lamp, which comprises an arc tube in which a light-emitting substance is enclosed, and a sealing portion for keeping the arc tube airtight. That is, a step of preparing a glass tube for a discharge lamp having an arc tube portion which becomes an arc tube of a high pressure discharge lamp and a side tube portion extending from the arc tube portion, and a glass tube in the side tube portion. Inserting, then heating the side tube portion to bring them into close contact, and inserting the electrode structure including at least an electrode rod into the glass tube that has been brought into close contact with the side tube portion, and then the side tube portion And heating the glass tube
After completing the step of contracting and sealing the electrode structure and the step of sealing the electrode structure to complete the sealing part of the high pressure discharge lamp, the strain point temperature of the glass tube Heating the sealing portion at a higher temperature for 2 hours or more.

In a fourth method for manufacturing a high pressure discharge lamp according to the present invention, a step of inserting an electrode structure including at least an electrode rod into a glass tube, a part of the glass tube, and at least one of the electrode structures. The step of bringing the parts into close contact with each other, the arc tube portion serving as the arc tube of the high pressure discharge lamp, and the side tube portion of the glass tube for discharge lamp having the side tube portion extending from the arc tube portion, the electrode structure A step of inserting the glass tube, at least a portion of which is in close contact, a step of sealing the electrode structure by heating and shrinking the side tube part and the glass tube, and a step of sealing the electrode structure. After completing the sealing part of the high-pressure discharge lamp by performing the step of, the step of heating the sealing part at a temperature higher than the strain point temperature of the glass tube for 2 hours or more. .

In a preferred embodiment, the electrode structure comprises the electrode rod, a metal foil connected to the electrode rod, and an external lead connected to the metal foil.

At least a part of the electrode rod is provided with Pt, I
It is preferable that a metal film composed of at least one metal selected from the group consisting of r, Rh, Ru, and Re is formed.

A coil having at least the surface of at least one metal selected from the group consisting of Pt, Ir, Rh, Ru and Re is preferably wound around at least a part of the electrode rod.

[0028] In a preferred embodiment, a small-diameter portion in which the inner diameter of the side tube portion is smaller than that of the other portion is provided around the boundary between the side tube portion and the arc tube portion in the discharge lamp glass pipe. Is provided.

In a preferred embodiment, the side tube portion is made of glass containing 99% by weight or more of SiO ₂ , and the glass tube has 15% by weight or less of Al ₂ O ₃ and 4% by weight or less. At least one of B and Si
It is composed of glass containing O ₂ and the heating step is performed at 1080 ° C. or lower.

A fifth method for manufacturing a high pressure discharge lamp according to the present invention is a method for manufacturing a high pressure discharge lamp having a light emitting tube in which a light emitting substance is enclosed, and a pair of sealing portions extending from both ends of the light emitting tube. A method of preparing a glass tube for a discharge lamp having an arc tube part to be an arc tube of a high pressure discharge lamp, and a pair of side tube parts extending from both ends of the arc tube part; On one side pipe part of the side pipe part,
A glass tube made of a second glass having a softening point lower than that of the first glass constituting the side tube portion, an electrode rod is connected to one end of the metal foil, and an external lead is provided at the other end of the metal foil. Inserting a connected electrode structure, and then heat-shrinking the side tube portion to form one sealing portion of the pair of sealing portions; and the one sealing After forming the part, the step of introducing a luminescent substance into the arc tube part, and after introducing the luminescent substance, the other side tube part to the one side, a glass tube composed of the second glass, The electrode structure in which the electrode rod is connected to one end of the metal foil and the external lead is connected to the other end of the metal foil is inserted, and then the side tube portion is heat-shrinked, thereby The sealing part and the light-emitting A step of forming a tube, and a temperature higher than a strain point temperature of the second glass and a strain of the first glass with respect to the completed lamp body in which both the sealing parts and the arc tube are formed. Heating at least a portion including the glass tube and the side tube portion at a temperature lower than the point temperature.

In a preferred embodiment, in the step of forming the one sealing portion and the step of forming the other sealing portion, the electrode structure is a connecting portion between the electrode rod and the metal foil. Is covered by the glass tube,
Further, the tip end of the electrode rod is inserted into the side tube portion so as to be located inside the arc tube portion.

In a preferred embodiment, in at least one of the step of forming the one sealing portion and the step of forming the other sealing portion, in the electrode structure, the entire metal foil is made of the glass. To be covered by a tube,
Further, the tip end of the electrode rod is inserted into the side tube portion so as to be located inside the arc tube portion.

In a preferred embodiment, a small diameter portion is formed at one end of the glass tube, and the glass tube is made of the metal so that the small diameter portion contacts a part of the metal foil. Cover the foil.

The wall thickness of the glass tube is 0.1 mm or more 1
It is preferably not more than mm.

The length of the glass tube in the longitudinal direction is 3 mm.
It is preferably 7 mm or less.

The length of the glass tube in the longitudinal direction is 3 mm.
It may be 5 mm or less.

A sixth method for manufacturing a high pressure discharge lamp according to the present invention is a method for manufacturing a high pressure discharge lamp having a light emitting tube in which a light emitting substance is enclosed, and a pair of sealing portions extending from both ends of the light emitting tube. A method of preparing a glass tube for a discharge lamp having an arc tube part to be an arc tube of a high pressure discharge lamp, and a pair of side tube parts extending from both ends of the arc tube part; On one side pipe part of the side pipe part,
A glass tube including a second glass having a softening point lower than that of the first glass forming the side tube portion, an electrode rod is connected to one end of the metal foil, and an external lead is connected to the other end of the metal foil. And a step of forming one sealing part of the pair of sealing parts by heat-shrinking the side tube part. After forming, a step of introducing a luminescent material into the arc tube portion; and after introducing the luminescent material, a glass tube containing the second glass in the other side tube portion with respect to the one and one end of a metal foil. An electrode structure in which an electrode rod is connected to the metal foil and an external lead is connected to the other end of the metal foil, and then the side tube portion is heat-shrinked to thereby seal the other side to the other side. And a process for forming an arc tube in which the luminescent material is enclosed. And a temperature higher than the strain point temperature of the second glass and lower than the strain point temperature of the first glass with respect to the completed lamp body on which both the sealing parts and the arc tube are formed. Heating at least a portion including the glass tube and the side tube portion at a temperature,
The glass tube inserted into at least one of the pair of side tube portions has at least a two-layer structure, and the layer of the glass tube located on the side facing the electrode structure is , The second glass, and the layer of the glass tube on the side facing the side tube portion is composed of the first glass.

In a preferred embodiment, the glass tube has a two-layer structure, and the inner layer of the glass tube is 1 layer.
It is composed of glass containing at least one of Al ₂ O ₃ of 5% by weight or less and B of 4% by weight or less and SiO _2, and the outer layer of the glass tube is made of SiO ₂ of 9% or less.
It is made of glass containing 9% by weight or more, and the glass tube is inserted into each of the pair of side tube portions.

In a preferred embodiment, the heating temperature is 1030 ° C. ± 40 ° C.

A seventh method for manufacturing a high-pressure discharge lamp according to the present invention is a method for manufacturing a high-pressure discharge lamp having an arc tube in which a luminescent material is enclosed, and a sealing portion for keeping the arc tube airtight. A step of preparing a glass tube for a discharge lamp having an arc tube portion which becomes an arc tube of a high pressure discharge lamp and a side tube portion extending from the arc tube portion; A glass member made of a second glass having a softening point lower than that of the first glass is inserted into the side tube portion, and then the side tube portion is heated to bring the glass member and the side tube portion into close contact with each other. And a temperature higher than the strain point temperature of the second glass, and
A step of holding a portion including at least the glass member and the side tube portion at a temperature lower than the strain point temperature of the glass, and a step of applying a pressure to the second glass portion during the holding step. Includes.

It is preferable that mercury is enclosed as the luminescent substance in an amount of 220 mg / cm ³ or more based on the internal volume of the arc tube.

The high pressure discharge lamp according to the present invention comprises a light emitting tube in which a light emitting substance is enclosed, and a pair of sealing portions for maintaining the airtightness of the light emitting tube. Each of the pair of sealing portions is provided. A first glass portion extending from the arc tube, and a second glass portion provided at least in a part of the inside of the first glass portion, and the pair of sealings Each of the parts has a part to which a compressive stress is applied, and the part to which the compressive stress is applied is the second glass part, the second glass part and the first glass part. A boundary portion, a portion of the second glass portion on the side of the first glass portion, and a portion of the first glass portion on the side of the second glass portion, The compressive stress at the portion where the stress is applied is about 10 kgf / m ² or more and about 50 kgf / cm ² or less, the the light emitting tube, a pair of electrode rods are arranged opposite to each other, each of the electrode rods of said pair of electrode rods is connected to the metal foil The metal foil is provided inside the sealing portion, and at least the connecting portion between the metal foil and the electrode rod is located inside the second glass portion.

In a preferred embodiment, all of the metal foil is located inside the second glass portion.

In a preferred embodiment, when the end of the second glass portion is located on the metal foil, the length of the second glass portion in the longitudinal direction is 3 mm or more and 5 mm or less.

In a preferred embodiment, the thickness of the portion of the second glass portion located on the metal foil is
It is 0.1 mm or more and 1 mm or less.

In one preferred embodiment, the high-pressure discharge lamp is a high-pressure mercury lamp, and mercury as the luminescent substance is 150 mg / mole based on the inner volume of the arc tube.
Enclosed in cm ³ or more.

It is preferable that mercury is contained as the luminescent substance in an amount of 220 mg / cm ³ or more based on the internal volume of the arc tube.

Mercury may be sealed as the luminescent substance in an amount of 300 mg / cm ³ or more based on the internal volume of the arc tube.

A lamp unit according to the present invention comprises the above high pressure discharge lamp and a reflecting mirror that reflects the light emitted from the high pressure discharge lamp.

In one embodiment, the high-pressure discharge lamp comprises a light emitting tube in which a light emitting substance is enclosed, and a sealing portion for maintaining the airtightness of the light emitting tube, wherein the sealing portion is the light emitting tube. A first glass portion extending from the first glass portion and a second glass portion provided on at least a part of the inside of the first glass portion, and the sealing portion has a compressive stress. It has an applied part.

The portion to which the compressive stress is applied is the second glass portion, the boundary portion between the second glass portion and the first glass portion, and the first glass portion of the second glass portion. Any portion selected from the group consisting of a portion on the glass portion side and a portion on the second glass portion side of the first glass portion may be used.

There may be a strained boundary region around the boundary between the first glass part and the second glass part, which is caused by the difference in compressive stress between the two.

It is preferable that a metal portion that is in contact with the second glass portion and that is for supplying electric power is provided in the sealing portion.

The compressive stress may be applied at least in the longitudinal direction of the sealing portion.

The first glass part contains 99% by weight or more of SiO _2, and the second glass part contains at least one of 15% by weight or less of Al ₂ O ₃ and 4% by weight or less of B. , SiO ₂ is preferable.

The softening point of the second glass portion is preferably lower than the softening point temperature of the first glass portion.

The second glass portion is preferably a glass portion formed of a glass tube.

The second glass portion is preferably not a glass portion formed by compressing glass powder and sintering it.

In one embodiment, a pair of the sealing portions extends from the arc tube, and each of the pair of sealing portions includes the first glass portion and the second glass portion. And has each of the pair of sealing portions,
It has a portion to which compressive stress is applied.

In one embodiment, the compressive stress at the portion to which the compressive stress is applied is about 10 kg.
It is not less than f / cm ^{2 and not} more than about 50 kgf / cm ² .

In one embodiment, the difference in compressive stress is about 10 kgf / cm ² or more and about 50 kgf / cm ² or less.

In one embodiment, a pair of electrode rods are arranged in the arc tube so as to face each other, and at least one electrode rod of the pair of electrode rods is connected to a metal foil. The metal foil is provided inside the sealing portion, and at least a part of the metal foil is located inside the second glass portion.

In one embodiment, at least mercury is sealed in the arc tube as the luminescent material,
The enclosed amount of mercury is 300 mg / cc or more.

In one embodiment, the high pressure discharge lamp is a high pressure mercury lamp having an average color rendering index Ra of more than 65.

The color temperature of the high-pressure mercury lamp is 8000.
It is preferably K or more.

The high pressure discharge lamp may be a metal halide lamp containing at least a metal halide as the light emitting substance.

In one embodiment, the high-pressure discharge lamp includes an arc tube in which a pair of electrode rods are arranged in the tube, and a pair of sealing portions extending from the arc tube and maintaining airtightness in the arc tube. A part of each of the electrode rods of the pair of electrode rods is embedded in each of the pair of sealing portions, and the sealing portion is a first electrode extending from the arc tube. It has a glass part and a second glass part provided on at least a part of the inside of the first glass part, and the at least one sealing part is a part to which a compressive stress is applied. The portion having the compressive stress is the second glass portion, the boundary portion between the second glass portion and the first glass portion, and the second glass portion of the second glass portion. 1 part of the glass part side, and the second of the first glass part Selected from the group consisting of parts on the lath side, compressive stress exists in at least the longitudinal direction of the sealing part in the second glass part, and is embedded in the at least one sealing part. On at least a part of the surface of the electrode rod in the portion, Pt, Ir, Rh,
A metal film made of at least one metal selected from the group consisting of Ru and Re is formed.

In one embodiment, an arc tube having a pair of electrode rods arranged in the tube and a pair of sealing portions extending from the arc tube for maintaining airtightness in the arc tube are provided. A part of each of the electrode rods is embedded in each of the pair of sealing portions, and at least one of the sealing portions is a first glass portion extending from the arc tube. And a second glass portion provided on at least a part of the inside of the first glass portion, and the at least one sealing portion has a portion to which compressive stress is applied. The portion to which the compressive stress is applied is the second glass portion, the boundary portion between the second glass portion and the first glass portion, and the first glass portion of the second glass portion. The part on the glass part side and the second glass part of the first glass part. Is selected from the group consisting of portions of the scan side, the at least a portion of the electrode rod in the implanted portion on at least one of the sealing portion, Pt, I
A coil having at least the surface of at least one metal selected from the group consisting of r, Rh, Ru, and Re is wound.

In one embodiment, each of the pair of electrode rods is connected to a metal foil provided inside each of the pair of sealing portions, and is provided in the at least one sealing portion. At least a part of the metal foil is located inside the second glass portion.

[0070] In one embodiment, the second glass portion contains SiO ₂ and at least one of 15% by weight or less of Al ₂ O ₃ and 4% or less of B.
The glass portion of which contains 99% by weight or more of SiO ₂ , the softening point of the second glass portion is lower than the softening point temperature of the first glass portion, and the second glass portion compresses the glass powder. It is not formed and sintered.

In one embodiment, the compressive stress at the portion to which the compressive stress is applied is about 10 kg.
It is not less than f / cm ^{2 and not} more than about 50 kgf / cm ² .

In one embodiment, in the arc tube,
At least mercury is enclosed as a luminescent substance, and the enclosed amount of the mercury is 300 mg / cc or more.

The high pressure discharge lamp may be a metal halide lamp containing at least a metal halide as the light emitting substance.

The high pressure discharge lamp in one embodiment comprises:
A translucent airtight container, a pair of electrodes provided in the airtight container, and a pair of sealing parts connected to the airtight container, at least one of the pair of sealing parts, the arc tube A first glass part extending from the first glass part and a second glass part provided on at least a part of the inner side of the first glass part, and the second glass part has the sealing material. There is a compressive stress in at least the longitudinal direction of the stopper, mercury is not substantially enclosed in the airtight container, and
At least a first halide, a second halide, and a rare gas are enclosed, the metal of the first halide is a luminescent substance, and the second halide is the first Has a higher vapor pressure as compared with the halide of, and compared with the metal of the first halide,
It is a halide of one or more kinds of metals that hardly emit light in the visible region.

The high pressure discharge lamp in one embodiment comprises:
A transparent airtight container, a pair of electrodes provided in the airtight container, and a pair of sealing portions extending from the airtight container, at least one of the pair of sealing portions, the arc tube A first glass part extending from the first glass part and a second glass part provided on at least a part of the inner side of the first glass part, and the second glass part has the sealing material. There is a compressive stress in at least the longitudinal direction of the stopper, mercury is not substantially enclosed in the airtight container, and
At least a first halide, a second halide, and a rare gas are enclosed, and the first halide is one selected from the group consisting of sodium, scandium, and a rare earth metal, or A plurality of types of halides, wherein the second halide has a relatively high vapor pressure, and is one type of a metal that is less likely to emit light in the visible region than the metal of the first halide, or Multiple types of halides.

In one embodiment, a method for manufacturing a high pressure discharge lamp is provided with a glass tube for a discharge lamp having an arc tube part which becomes an arc tube of the high pressure discharge lamp and a side tube part extending from the arc tube part. And a step of inserting a glass tube into the side tube portion, then heating the side tube portion to bring them into close contact, and an electrode including at least an electrode rod in the glass tube brought into close contact with the side tube portion. Inserting the structure, and then heating and shrinking the side tube portion and the glass tube to seal the electrode structure.

In one embodiment, the method for manufacturing a high pressure discharge lamp is the step of inserting an electrode structure including at least an electrode rod into a glass tube, a part of the glass tube, and at least a part of the electrode structure. And a step of closely contacting
At least a part of the electrode structure is in close contact with a side tube portion of a glass pipe for a discharge lamp having a light emitting tube portion which becomes a light emitting tube of a high pressure discharge lamp and a side tube portion extending from the light emitting tube portion. By inserting the glass tube and heating and shrinking the side tube portion and the glass tube,
Sealing the electrode structure.

In one embodiment, the side tube portion is S
The glass tube contains 99% by weight or more of iO ₂ , and at least one of 15% by weight or less of Al ₂ O ₃ and 4% or less of B, and SiO ₂ .

The softening point of the glass tube is preferably lower than the softening point temperature of the side tube portion.

In one embodiment, by performing the step of sealing the electrode structure, the glass tube, the boundary portion between the glass tube and the side tube portion, and the side tube portion of the glass tube. A compressive stress of about 10 kgf / cm ² or more and about 50 kgf / cm ² or less is applied to the side portion and a portion of the side tube portion selected from the group consisting of the glass tube side portion, Occurs at least in the longitudinal direction.

In one embodiment, after the step of sealing the electrode structure is performed to complete the sealing part of the high pressure discharge lamp, heat is applied to the sealing part to about 10 kgf / cm 2.
^More than about 50 kgf / cm ² or less of compressive stress causes a portion of the sealing portion.

After the step of sealing the electrode structure is performed to complete the sealing part of the high pressure discharge lamp, the sealing part is heated for 2 hours at a temperature higher than the strain point temperature of the glass tube. As described above, it is preferable to further perform the heating step.

In one embodiment, the electrode structure includes the electrode rod, a metal foil connected to the electrode rod,
It is composed of external leads connected to the metal foil.

In one embodiment, a metal film made of at least one metal selected from the group consisting of Pt, Ir, Rh, Ru and Re is formed on at least a part of the electrode rod.

In one embodiment, Pt, Ir, Rh, R
A coil having at least the surface of at least one metal selected from the group consisting of u and Re is wound around at least a part of the electrode rod.

In one embodiment, a small diameter portion in which the inner diameter of the side tube portion is smaller than that of the other portion is provided around the boundary between the side tube portion and the arc tube portion in the glass tube for discharge lamp. Has been.

The high-pressure discharge lamp in one embodiment comprises:
The glass tube is provided with a sealing portion formed by heating and closely contacting both a side tube portion extending from an arc tube portion serving as an arc tube of a high pressure discharge lamp and a glass tube inserted into the side tube portion. Of the glass constituting the side tube portion and higher than the strain point temperature thereof and lower than the strain point temperature of the glass forming the side tube portion.

The high pressure discharge lamp in one embodiment is
An arc tube in which a luminescent material is enclosed, and a sealing section for maintaining airtightness of the arc tube, wherein the sealing section includes a first glass section extending from the arc tube and the first glass section. 1 has a second glass portion provided on at least a part of the inside of the glass portion, and when performing strain measurement by a sensitive color plate method utilizing a photoelastic effect, among the sealing portions, The second
A compressive stress is observed in at least a part of the region corresponding to the glass portion of.

The strain is measured by SVP-200 manufactured by Toshiba.
The strain inspector may be used.

A light bulb according to an embodiment comprises a bulb in which a luminescent material is sealed in a tube, and a sealing portion for maintaining airtightness in the bulb, the sealing portion extending from the arc tube. It has a 1st glass part and a 2nd glass part provided in at least one part of the inside of the 1st glass part, and the above-mentioned sealing part is a site where compressive stress is applied. Have

In the present invention, a glass member made of the second glass having a lower softening point than the first glass forming the side tube portion is inserted into the side tube portion, and then the side tube portion is heated. After the glass member and the side tube portion are brought into close contact with each other, the glass member is at a temperature higher than the strain point temperature of the second glass and lower than the strain point temperature of the first glass. And heating a portion including at least the side tube portion. As a result, the sealing part has the first glass part extending from the arc tube and the second glass part provided on at least a part of the inside of the first glass part, and the sealing part is provided. The stopper can manufacture a high pressure discharge lamp having a portion to which compressive stress is applied. Due to the existence of the portion to which the compressive stress is applied, the pressure resistance of the high pressure discharge lamp can be improved.

Pt, on the surface of at least a part of the electrode rod in the portion embedded in at least one sealing portion,
When a metal film composed of at least one metal selected from the group consisting of Ir, Rh, Ru, and Re is formed, wetting between the surface of the electrode rod and the glass of the sealing portion. Since it is possible to deteriorate the property, the separation between the two becomes better during the lamp manufacturing process. As a result, it becomes possible to prevent the generation of minute cracks and further improve the pressure resistance of the lamp. A coil having at least one metal selected from the group consisting of Pt, Ir, Rh, Ru, and Re on at least the surface thereof is provided on at least a part of the electrode rod in the portion embedded in at least one sealing portion. Even when wound, it is possible to prevent the generation of fine cracks, and it is possible to further improve the pressure resistance of the lamp.

The present invention can be applied not only to high pressure mercury lamps but also to other high pressure discharge lamps such as metal halide lamps and xenon lamps, and also to mercury-free mercury-free metal halide lamps. Since the mercury-free metal halide lamp according to the present invention has high pressure resistance, it can be filled with a rare gas under high pressure, and as a result, efficiency can be easily improved and, in addition, lighting startability can be improved. The present invention can be applied not only to a high-pressure mercury lamp, but also to a light bulb (for example, a halogen light bulb), and as a result, it is possible to prevent rupture more than conventional ones.

[0094]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the drawings below,
For simplification of description, components having substantially the same function are designated by the same reference numeral. The present invention is not limited to the embodiments below. (Embodiment 1) FIGS. 1A and 1B schematically show the configuration of a lamp 100 according to this embodiment. The lamp 100 of the present embodiment is a high pressure discharge lamp including a light emitting tube 1 in which a light emitting substance (6) is sealed in the tube, and a sealing portion 2 extending from the light emitting tube 1, and is shown in FIG. The lamp is a high pressure mercury lamp. FIG. 1A shows a lamp 10
1 schematically shows the overall configuration of the sealing member 2 as viewed from the side of the arc tube 1 taken along the line bb in FIG. 1 (a). Shows.

The sealing portion 2 of the lamp 100 is a portion for maintaining the airtightness of the interior 10 of the arc tube 1, and the lamp 100
Is a double-end type lamp having two sealing parts 2. The sealing part 2 includes a first glass part (side tube part) 8 extending from the arc tube 1 and a second glass provided on at least a part of the inside (center side) of the first glass part 8. And the sealing portion 2 has a portion (7) to which compressive stress is applied. In the present embodiment, the portion to which compressive stress is applied is This is a portion corresponding to the second glass portion 7. As shown in FIG. 1B, the cross-sectional shape of the sealing portion 2 is substantially circular, and a metal portion (4) for supplying lamp power is provided inside the sealing portion 2. A part of this metal part (4) is in contact with the second glass part 7, and in the present embodiment, the metal part 4 is located at the center of the second glass 7. The second glass 7 is located at the center of the sealing portion 2, and the outer periphery of the second glass portion 7 is covered with the first glass portion 8.

When the lamp 100 of the present embodiment is subjected to strain measurement by the sensitive color plate method utilizing the photoelastic effect and the sealing portion 2 is observed, the portion corresponding to the second glass portion 7 is observed. It is confirmed that compressive stress is present. In the strain measurement by the sensitive color plate method, it is not possible to observe the strain (stress) in the cross section in which the sealing portion 2 is sliced while maintaining the shape of the lamp 100.
The fact that the compressive stress was observed in the portion corresponding to the glass portion 7 of the second glass portion 7 means that the compressive stress is applied to all or most of the second glass portion 7 as well as the second glass portion 7 and the first glass portion 7. When a compressive stress is applied to the boundary portion with the glass portion 8, a portion of the second glass portion 7 on the first glass portion 8 side or a second glass portion of the first glass portion 8 7
This means that the compressive stress is applied to a part of the sealing portion 2 either in the case where the compressive stress is applied to the side portion or in a form in which they are combined. Further, in this measurement, the stress (or strain) compressing in the longitudinal direction of the sealing portion 2
Is observed as an integral value.

The first glass portion 8 in the sealing portion 2 is S
It contains 99% by weight or more of iO ₂ , and is made of, for example, quartz glass. On the other hand, the second glass part 7
Is 15% by weight or less of Al ₂ O ₃ and 4% by weight or less of B
At least one of the above and SiO ₂ is included, and is made of, for example, Vycor glass. S
The addition of Al ₂ O ₃ or B to iO ₂ lowers the softening point of the glass, so the softening point of the second glass part 7 is lower than the softening point temperature of the first glass part 8. In addition, Vycor glass (trade name) is a glass in which an additive is mixed with quartz glass to lower the softening point, thereby improving workability as compared with quartz glass. For example, borosilicate glass is heat-treated. It can be produced by chemical treatment to bring it closer to the characteristics of quartz. The composition of Vycor glass is
For example, silica (SiO ₂ ) 96.5% by weight, alumina (Al ₂ O ₃ ) 0.5% by weight, and boron (B) 3% by weight. In the present embodiment, the second glass portion 7 is formed from a glass tube made of Vycor glass. Instead of the Vycor glass tube, SiO ₂ : 62% by weight,
A glass tube containing Al ₂ O ₃ : 13.8 wt% and CuO: 23.7 wt% may be used.

The compressive stress applied to a part of the sealing portion 2 may be substantially more than zero (that is, 0 kgf / cm ² ). The compressive stress is in a state where the lamp is not lit. Due to the presence of this compressive stress, the compressive strength can be improved as compared with the conventional structure. The compressive stress is preferably about 10 kgf / cm ² or more (about 9.8 × 10 ⁵ N / m ² or more). And about 50 kgf / cm ² or less (about 4.9 × 1
It is preferably 0 ⁶ N / m ² or less). 10 kgf /
If it is less than cm ² , the compressive strain is weak and the pressure resistance of the lamp may not be sufficiently increased in some cases. Further, there is no practical glass material for realizing the constitution in which the constitution exceeds 50 kgf / cm ² . However, even if the pressure is less than 10 kgf / cm ² , if the value exceeds substantially 0, the withstand voltage can be increased as compared with the conventional structure, and 50 kgf / cm ²
If a practical material that can realize a structure exceeding 100 kg / cm ² is developed, compressive stress exceeding 50 kg / cm 2
The glass part 7 may have.

Inferring from the result of observing the lamp 100 with a strain inspector, a strain boundary caused by a difference in compressive stress between the first glass portion 8 and the second glass portion 7 is estimated around the boundary. Region 20 appears to be present. This means that the compressive stress is exclusively applied to the second glass portion 7 (or
It exists in the vicinity of the outer periphery of the second glass portion 7), which means that the compressive stress of the second glass portion 7 is not so much (or almost) transmitted to the entire first glass portion 8. It is thought that The difference in compressive stress between the two (8, 7) is, for example, from about 10 kgf / cm ² to about 50 kgf.
It can be in the range of / cm ² .

The arc tube 1 of the lamp 100 has a substantially spherical shape and, like the first glass portion 8, is made of quartz glass. In order to realize a high-pressure mercury lamp (particularly, an ultra-high-pressure mercury lamp) that exhibits excellent characteristics such as a long life, the quartz glass forming the arc tube 1 has a low alkali metal impurity level (for example, 1 ppm or less). ) It is preferable to use high-purity quartz glass. Of course,
It is also possible to use quartz glass having an ordinary alkali metal impurity level. The outer diameter of the arc tube 1 is, for example, 5 mm to 2
The thickness of the arc tube 1 is, for example, 1 mm.
It is about 5 mm. The volume of the discharge space (10) in the arc tube 1 is, for example, about 0.01 to 1 cc (0.01 to 1 c
m ³ ). In this embodiment, the arc tube 1 having an outer diameter of about 9 mm, an inner diameter of about 4 mm, and a discharge space capacity of about 0.06 cc is used.

In the arc tube 1, a pair of electrode rods (electrodes) 3
Are arranged to face each other. The tip of the electrode rod 3 is
They are arranged in the arc tube 1 at intervals (arc length) D of about 0.2 to 5 mm (for example, 0.6 to 1.0 mm),
Each of the electrode rods 3 is made of tungsten (W). The tip of the electrode rod 3 has a coil 1 for the purpose of lowering the temperature of the electrode tip during lamp operation.
2 is wound. In this embodiment, a tungsten coil is used as the coil 12, but a thorium-tungsten coil may be used. Further, as the electrode rod 3, not only a tungsten rod but also a rod made of thorium-tungsten may be used.

In the arc tube 1, mercury 6 is used as a luminescent substance.
Is enclosed. Lamp 10 as an ultra-high pressure mercury lamp
When operating 0, mercury 6 is, for example, 200 mg /
cc or higher (220 mg / cc or higher or 230 mg / cc or higher, or 250 mg / cc or higher), preferably about 300 mg / cc or higher (for example, 300 mg / cc to 500 mg / cc) mercury, and 5- Noble gas of 30 kPa (eg, argon)
And, a small amount of halogen is enclosed in the arc tube 1 as needed.

The halogen sealed in the arc tube 1 is
The W (tungsten) evaporated from the electrode rod 3 during
It plays the role of the halogen cycle for returning to the electrode rod 3 again.
For example, bromine. The enclosed halogen is a single
Not only the form, but also the form of the halogen precursor (form of the compound
State), and in the present embodiment, halogen is CH.
₂Br₂Is introduced into the arc tube 10 in the form of. Also books
CH in the embodiment₂ Br₂The enclosed amount is 0.0017
~ 0.17 mg / cc, which is the lamp operation
When converted to the halogen atom density at that time, 0.01 to 1 μm
It corresponds to about ol / cc. The withstand voltage of the lamp 100
Strength (operating pressure) is 20 MPa or more (for example, 30 to
50 MPa or more)
It The tube wall load is, for example, 60 W / cm.²Less than
It is above, and no upper limit is set. Illustratively,
The tube wall load is, for example, 60 W / cm²3 or more
00W / cm²Range (preferably 80 to 200)
W / cm²Lamp) can be realized. cold
300 W / cm if a rejection means is provided²Negative wall wall
It is also possible to achieve a load. Note that the rated power is an example
For example, 150W (in that case, the wall load is about 130W /
cm²Is equivalent to).

The electrode rod 3 whose one end is located in the discharge space 10
Is connected to the metal foil 4 provided inside the sealing portion 2 by welding, and at least a part of the metal foil 4 is located inside the second glass portion 7. In the configuration shown in FIG. 1, the second glass portion 7 covers the portion including the connecting portion between the electrode rod 3 and the metal foil 4. Illustrating the dimensions of the second glass portion 7 in the configuration shown in FIG. 1, the sealing portion 2
2 to 20 mm (for example, 3 m
m, 5 mm, 7 mm), and the thickness of the second glass part 7 sandwiched between the first glass part 8 and the metal foil 4 is
It is about 0.01 to 2 mm (for example, 0.1 mm). The distance H from the end surface of the second glass portion 7 on the arc tube 1 side to the discharge space 10 of the arc tube 1 is about 0 mm to about 6 mm (for example, 0 mm to about 3 mm, or 1 mm to 6 mm). When it is not desired to expose the second glass portion 7 in the discharge space 10, the distance H is larger than 0 mm, for example, 1 mm or more. The distance B from the end face of the metal foil 4 on the side of the arc tube 1 to the discharge space 10 of the arc tube 1 (in other words, the length buried in the sealing portion 2 only by the electrode rod 3) is, for example, It is about 3 mm.

As described above, the cross-sectional shape of the sealing portion 2 is
It has a substantially circular shape, and the metal foil 4 is provided in the substantially central portion thereof. The metal foil 4 is, for example, a rectangular molybdenum foil (Mo
The width (length on the short side) of the metal foil 4 is, for example, about 1.0 mm to 2.5 mm (preferably 1.0 mm).
mm to about 1.5 mm). The thickness of the metal foil 4 is, for example, about 15 μm to 30 μm (preferably 15 μm).
Is about 20 μm). The ratio of thickness to width is about 1: 100. The length of the metal foil 4 (length on the long side) is, for example, about 5 mm to 50 mm.

An external lead 5 is provided by welding on the side opposite to the side where the electrode rod 3 is located. An external lead 5 is connected to a side of the metal foil 4 opposite to the side to which the electrode rod 3 is connected, and one end of the external lead 5 has a sealing portion 2
Extends to the outside. By electrically connecting the external lead 5 to a lighting circuit (not shown), the lighting circuit and the pair of electrode rods 3 are electrically connected. The sealing portion 2 plays a role of keeping the discharge space 10 in the arc tube 1 airtight by pressing the glass portions (7, 8) of the sealing portion and the metal foil 4 to each other. The sealing mechanism by the sealing portion 2 will be briefly described below.

Since the material forming the glass portion of the sealing portion 2 and the molybdenum forming the metal foil 4 have different coefficients of thermal expansion from each other, from the viewpoint of the coefficient of thermal expansion, they are in an integrated state. It doesn't. However, this configuration (foil sealing)
In the case of, the metal foil 4 is pressed by the pressure from the glass part of the sealing part.
Can plastically deform to fill the gap between the two. As a result, the glass portion of the sealing portion 2 and the metal foil 4 can be brought into a state in which they are pressed against each other, and the sealing portion 2 can seal the inside of the arc tube 1. That is, the sealing of the sealing portion 2 is performed by foil sealing by pressure bonding between the glass portion of the sealing portion 2 and the metal foil 4. In this embodiment, since the second glass portion 7 having a compressive strain is provided, the reliability of this seal structure is improved.

Next, the compressive strain in the sealing portion 2 will be described. 2A and 2B schematically show the distribution of compressive strain along the longitudinal direction (electrode axis direction) of the sealing portion 2, and FIG. 2A shows the second glass portion. In the case of the configuration of the lamp 100 provided with 7, on the other hand, FIG.
It shows a case of a configuration of a lamp 100 ′ without the second glass portion 7 (comparative example).

Of the sealing portion 2 shown in FIG. 2A, the second
The compressive stress (compressive strain) is present in the region corresponding to the glass portion 7 (hatched region), and the magnitude of the compressive stress at the portion of the first glass portion 8 (hatched region) is substantially zero. . On the other hand, as shown in FIG. 2B, the second glass portion 7
In the case of the sealing portion 2 without the above, there is no portion where the compressive strain locally exists, and the magnitude of the compressive stress of the first glass portion 8 is substantially zero.

The inventor of the present application actually quantitatively measured the strain of the lamp 100 and observed that the second glass portion 7 of the sealing portion 2 had a compressive stress. The measurement results are shown in FIGS. 3 and 4. The strain was quantified by using a sensitive color plate method utilizing the photoelastic effect. According to this method, the color of a portion having a strain (stress) appears to change, and the color can be compared with a strain standard device to quantify the magnitude of the strain. That is, the stress can be calculated by reading the optical path difference of the same color as the strain to be measured. The measuring instrument used for quantifying the strain is a strain inspector (Toshiba: SVP-200). When this strain inspecting instrument is used, the magnitude of the compressive strain of the sealing part 2 is It can be obtained as the average value of the stress applied to No. 2.

FIG. 3 (a) is a photograph showing the distribution of the compressive stress for the lamp 100 measured using the sensitive color plate method utilizing the photoelastic effect, while FIG. 3 (b) shows 2 is a photograph showing the distribution of the compressive stress for the lamp 100 ′ having no glass part 7 of No. 2. 4A and 4B are trace diagrams for FIGS. 3A and 3B, respectively.

As shown in FIGS. 3A and 4A, the second glass portion 7 of the sealing portion 2 of the lamp 100.
There is a part where the area is different from the surrounding (8) in color (light color), and it can be seen that the second glass portion 7 has compressive stress (compressive strain). On the other hand, as shown in FIG. 3B and FIG. 4B, there is no region of different color (light color) in the sealing portion 2 of the lamp 100 ′, and therefore, the sealing portion 2 (first It can be seen that the compressive stress does not exist in the specific portion of the glass portion 8).

Next, the principle of strain measurement by the sensitive color plate method utilizing the photoelastic effect will be briefly described with reference to FIG. FIGS. 5A and 5B schematically show a state in which linearly polarized light that is transmitted through a polarizing plate is incident on glass. Here, if u is the vibration direction of linearly polarized light, u
Can be regarded as a product of u1 and u2 combined.

As shown in FIG. 5 (a), when there is no distortion in the glass, u1 and u2 pass through the glass at the same speed, so a deviation occurs between the transmitted light u1 and u2. Absent.
On the other hand, as shown in FIG. 5B, the glass has a distortion,
When the stress F is working, since u1 and u2 do not pass through it at the same speed, a deviation occurs between the transmitted light u1 and u2. That is, one of u1 and u2 lags behind the other. This delayed distance is called the optical path difference.
Since the optical path difference R is proportional to the stress F and the passage distance L of the glass, if the proportional constant is C, it can be expressed by R = C · F · L. Here, the unit of each symbol is R (nm), F (kgf / cm ² ), L (cm),
It is C ({nm / cm} / {kgf / cm ² }). C
Is a material such as glass and is called a photoelastic constant. As can be seen from the above equation, if C is known, then L
By measuring and R, F can be determined.

The inventor of the present application measures the light transmission distance L in the sealing portion 2, that is, the outer diameter L of the sealing portion 2, and uses a strain standard to measure the sealing portion 2 at the time of measurement. The optical path difference R was read from the color. As the photoelastic constant C, the photoelastic constant 3.5 of quartz glass was used. Substituting these into the above equation, the results of the calculated stress values are shown in the bar graph of FIG.

As shown in FIG. 6, the stress is 0 [kgf / c
m ² ], the number of lamps was 0, and 10.2
The number of lamps that were [kgf / cm ² ] was 43, the number of lamps that were 20.4 [kgf / cm ² ] was 17, and 35.7 [kgf / c
m ² ], the number of lamps was 0. On the other hand, in the case of the lamp 100 ′ of the comparative example, the stress was 0 [kgf / cm ² ] for all the measured lamps. In addition, on the principle of measurement, the compressive stress of the sealing portion 2 was calculated from the average value of the stress applied to the sealing portion 2. However, by providing the second glass portion 7, a part of the sealing portion 2 is provided. It can be easily concluded from the results shown in FIGS. 3, 4 and 6 that the compressive stress is applied to. This is because, in the comparative lamp 100 ', no compressive stress was present in the sealing portion 2. Further, FIG. 6 shows discrete stress values, which is due to the fact that the optical path difference read from the strain standard device is discrete. Therefore, the discrete stress values are due to the principle of strain measurement by the sensitive color plate method. In practice, for example, 1
0.2 [kgf / cm ² ] and 20.4 [kgf / cm ² ]
There seems to be a stress value that indicates a value between and,
It does not change that a predetermined amount of compressive stress is present in the second glass portion 7 or the peripheral region of the second glass portion 7.

In this measurement, the stress was observed in the longitudinal direction of the sealing portion 2 (the direction in which the electrode shaft 3 extends), which means that there is no compressive stress in the other directions. Not something to do. In order to measure whether the compressive stress exists in the radial direction (center-outer circumferential direction) of the sealing portion 2 or in the circumferential direction of the sealing portion 2 (for example, in the clockwise direction), it is necessary to measure the arc tube 1 or the sealing tube. Although it is necessary to cut the stopper portion 2, the compressive stress of the second glass portion 7 is relieved as soon as such cutting is performed.
Therefore, what can be measured without cutting the lamp 100 is the compressive stress in the longitudinal direction of the sealing portion 2. Therefore, the inventor of the present application quantified at least the compressive stress in that direction. Of.

In the lamp 100 of this embodiment, the second glass portion 7 provided on at least a part of the inside of the first glass portion 8 has a compressive strain (at least a compressive strain in the longitudinal direction). Therefore, the pressure resistance of the high pressure discharge lamp can be improved. In other words, the lamp 100 of the present embodiment shown in FIGS. 1 and 2 (a) can have higher pressure resistance strength than the lamp 100 ′ of the comparative example shown in FIG. 2 (b). The lamp 100 of the present embodiment shown in FIG. 1 has a conventional maximum operating pressure of 2
It is possible to operate at an operating pressure of 30 MPa or more, which exceeds about 0 MPa.

Next, referring to FIG. 7, since the second glass portion 7 has a compressive strain, the lamp 100
The reason why the withstand pressure strength of is increased is explained. FIG. 7A is an enlarged view of a main part of the sealing portion 2 of the lamp 100, while FIG.
(B) is an enlarged view of a main part of the sealing part 2 of the lamp 100 'of the comparative example.

As for the mechanism of increasing the pressure resistance of the lamp 100, there are actually some unclear points.
The inventor of the present application reasoned about it as follows.

First, as a premise, the metal foil 4 in the sealing portion 2 is
Is heated and expanded during the operation of the lamp, the stress from the metal foil 4 is applied to the glass portion of the sealing portion 2. More specifically, in addition to the glass having a larger coefficient of thermal expansion than glass, the metal foil 4 which is thermally connected to the electrode rod 3 and through which an electric current passes has a sealing property. Since it is more easily heated than the glass portion of the stopper 2, stress is likely to be applied from the metal foil 4 to the glass portion (especially from the side surface of the foil having a small area).

Here, as shown in FIG. 7A, when compressive stress is applied in the longitudinal direction of the second glass portion 7, it is possible to suppress the generation of the stress 16 from the metal foil 4. Conceivable. In other words, it is considered that the compressive stress 15 of the second glass portion 7 can suppress the generation of the large stress 16. As a result, for example, a crack is generated in the glass portion of the sealing portion 2 or the occurrence of leakage between the glass portion of the sealing portion 2 and the metal foil 4 is reduced, and the strength of the sealing portion 2 is improved. Will be done.

On the other hand, as shown in FIG. 7B, in the case of the structure without the second glass portion 7, the stress 1 from the metal foil 4 is
7 is considered to be larger than in the case of the configuration shown in FIG. That is, since there is no region where a compressive stress is applied around the metal foil 4, the stress 17 from the metal foil 4 seems to be larger than the stress 16 shown in FIG. 7A. Therefore, it can be inferred that the structure shown in FIG. 7A can improve the withstand pressure strength more than the structure shown in FIG. 7B. This idea seems to be compatible with the general properties of glass in that glass is easily cracked when it is subjected to tensile strain (tensile stress), and it becomes difficult to break when it is subjected to compressive strain (compressive stress).

However, it cannot be inferred that the sealing portion 2 of the lamp 100 has a high compressive strength from the general property of glass that it becomes difficult to break when compressive stress is applied to the glass. Because even if the strength of the glass in the region containing the compressive strain increases,
This is because, when viewed as the entire sealing portion 2, a load is generated as compared with the case where there is no distortion, and therefore the idea that the overall strength of the sealing portion 2 is rather reduced can also be established. The result that the withstand pressure strength of the lamp 100 has been improved was found by the inventor of the present application only after trial manufacture and experiment of the lamp 100, and cannot be derived from the theory alone. If an unnecessarily large compressive stress remains in the second glass portion 7 (or the peripheral area thereof), the sealing portion 2 will actually be damaged when the lamp is lit, and the life of the lamp will be shortened. It may be shortened. Considering such a thing, the structure of the lamp 100 having the second glass portion 7 is
It is considered that it exhibits its high pressure resistance under an exquisite balance. When the part of the arc tube 1 is cut, the second
Inferring from the fact that the stress strain of the glass portion 7 is relaxed, the load due to the stress strain of the second glass portion 7 may be well accepted by the entire arc tube 1.

It is considered that the structure exhibiting the high compressive strength is provided by the strain boundary region 20 caused by the difference in compressive stress between the first glass portion 8 and the second glass portion 7. That is, substantially no compressive stress is applied to the first glass portion 8, and the area of only the second glass portion 7 (or the periphery of the outer periphery thereof) located closer to the center than the strain boundary area 20 is successfully processed. Since the compressive strain can be confined, it can be concluded that the excellent withstand voltage characteristic has been successfully achieved. Due to the principle of strain measurement by the sensitive color plate method, the stress values are discretely shown. As a result, in FIG.
Is clearly shown, even if the actual stress value is continuously shown, it is considered that the stress value changes sharply in the strain boundary region 20, and the region where the stress value changes sharply. On the contrary, it seems that the strain boundary region 20 can be defined conversely.

In the lamp 100 of this embodiment, as shown in FIG. 1, the second glass portion 7 is arranged so as to cover the welded portion of the electrode rod 3 and the metal foil 4, but the present invention is not limited to this. Instead, the configuration shown in FIG. 8 may be used. That is, as shown in FIG. 8, it is arranged so as to cover the entire portion of the electrode rod 3 embedded in the sealing portion 2 and a portion of the metal foil 4.
At this time, a part of the second glass portion 7 may be exposed in the discharge space 10 in the arc tube 1. That is, even if H = 0 in FIG. 1A and a part of the second glass portion 7 is exposed to the discharge space 10 in the arc tube 1, there is no particular problem from the viewpoint of improving the withstand voltage. However, when the lamp 100 is a high-pressure mercury lamp, it is also one idea to adopt a configuration in which the second glass portion 7 is not exposed to the discharge space 10 from the viewpoint of light color characteristics and life. The reason is the second
Since the glass portion 7 contains Al ₂ O ₃ and B in addition to SiO ₂ , if these additives come out in the discharge space 10, the characteristics of the lamp may be deteriorated. is there. As shown in FIGS. 1 and 8, the second glass portion 7 is arranged so as to cover the welded portion between the electrode rod 3 and the metal foil 4, because the damage / crack at this welded portion is relatively small. Since there are many, the strength of this part is increased.

The configuration shown in FIGS. 9 to 11 may be adopted. That is, as shown in FIG. 9, the second glass portion 7 may be arranged so that the second glass portion 7 covers the central portion of the metal foil 4, or as shown in FIG. The second glass portion 7 may be arranged so as to cover a welded portion between the outer lead 5 and the outer lead 5. In addition, as shown in FIG.
The second glass portion 7 may be arranged so as to cover the whole of the.

The pressure resistance of the lamp can be improved not only by the structure shown in FIG. 1 but also by the structures shown in FIGS. In other words, the lamp 100 'of the comparative example.
More mercury can be enclosed and the lamp can be lit at a high operating pressure.

In the structure shown in FIG. 1, the second glass portion 7 is provided in each of the pair of sealing portions 2, but the present invention is not limited to this, and only one sealing portion 2 is provided with the second glass portion 7. Even if the second glass portion 7 is provided, the pressure resistance strength can be improved as compared with the comparative lamp 100 ′. However, both sealing parts 2
It is preferable that the glass part 7 is provided and both the sealing parts 2 have a part to which a compressive stress is applied. This is because it is possible to achieve a higher withstand voltage when both sealing portions 2 have a portion to which compressive stress is applied than one sealing portion. , Probability of leak occurring in the sealing part when two sealing parts are provided, which has a part to which compressive stress is applied (that is, high breakdown voltage of a certain level). This is because it is possible to halve the probability of being unable to hold.

Further, in this embodiment, a high pressure mercury lamp (for example, an operating pressure of 20MP) in which the amount of mercury 6 enclosed is extremely large.
Ultra high pressure mercury lamps exceeding a) have been described, but the present invention can be suitably applied to high pressure mercury lamps having a mercury vapor pressure of about 1 MPa and not so high. The reason is that the stable operation even when the operating pressure is extremely high means that the lamp has high reliability.
That is, when the configuration of the present embodiment is applied to a lamp whose operating pressure is not so high (the operating pressure of the lamp is less than about 30 MPa, for example, about 20 MPa to about 1 MPa), the reliability of the lamp operating at the operating pressure is improved. This is because it can be improved. The configuration of this embodiment is
Since it suffices to introduce the member of the second glass part 7 as a new member into the sealing part 2, it is possible to obtain the effect of improving the pressure resistance with a small improvement. Therefore, it is very suitable for industrial use.

Next, referring to FIGS. 12 to 19,
A method of manufacturing the lamp 100 according to this embodiment will be described.

First, as shown in FIG. 12, the lamp 100
A glass tube 80 for a discharge lamp having an arc tube portion 1 ′ that becomes the arc tube (1) and a side tube portion 2 ′ extending from the arc tube portion 1 ′ is prepared. Glass pipe 80 of the present embodiment
Is a tube-shaped quartz glass having an outer diameter of 6 mm and an inner diameter of 2 mm, which is heated and expanded at a predetermined position to form a substantially spherical arc tube portion 1 '.

Further, as shown in FIG. 13, a glass tube 70 to be the second glass portion 7 is separately prepared. The glass tube 70 of the present embodiment has an outer diameter (D1) of 1.9 mm and an inner diameter (D1).
2) A Vycor glass tube having a length of 1.7 mm and a length (L) of 7 mm. The outer diameter D1 of the glass tube 70 is smaller than the inner diameter of the side tube portion 2'so that it can be inserted into the side tube portion 2'of the glass pipe 80.

Next, as shown in FIG. 14, the glass tube 70 is fixed to the side tube portion 2'of the glass pipe 80. In this fixing, after inserting the glass tube 70 into the side tube portion 2 ', the side tube portion 2'is heated to bring the two (2', 70) into close contact with each other. Hereinafter, this step will be described in more detail.

First, one glass tube 70 is inserted into the one side tube portion 2 '. Next, the glass pipe 80 is attached to both lathes. Here, the position of the glass tube 70 is finely adjusted using the cleaned tungsten rod. This fine adjustment work is convenient if a tungsten rod having a diameter smaller than the inner diameter of the side tube portion 2'is used. Of course, rods other than tungsten may be used.

Finally, the side tube portion 2'is heated by the burner to fix the outer wall of the glass tube 70 in close contact with the inner wall of the side tube portion 2 '. By this step, water (specifically, water in Vycor forming the glass tube 70) that is considered to adversely affect the lamp can be removed from the lamp, and as a result, the lamp can be highly purified. be able to. The same process is performed on the other side tube portion 2'to fix the glass tube 70 to the side tube portion 2 '. In this way, the structure as shown in FIG. 14 is obtained. Here, it is preferable to wash the inside of the tube once after the structure shown in FIG. 14 is manufactured. This is because impurities may have entered during the process of inserting and fixing the glass tube 70.

Next, as shown in FIG. 15, a separately manufactured electrode structure 50 is prepared and inserted into the side tube portion 2'to which the glass tube 70 is fixed. The electrode structure 50 includes an electrode rod 3, a metal foil 4 connected to the electrode rod 3, and an external lead 5 connected to the metal foil 4. Electrode rod 3
Is a tungsten electrode rod, and a tungsten coil 12 is wound around the tip thereof. Coil 12
May be made of thorium-tungsten.
Further, as the electrode rod 3, not only a tungsten rod but also a rod made of thorium-tungsten may be used.
A support member (metal clasp) 11 for fixing the electrode structure 50 to the inner surface of the side tube portion 2 ′ is provided at one end of the outer lead 5. Support member 1 shown in FIG.
Although 1 is a molybdenum tape (Mo tape) made of molybdenum, a ring-shaped spring made of molybdenum may be used instead. The width a of the Mo tape 11 is set to be slightly larger than the inner diameter 2 mm of the side tube portion 2 ', so that the electrode structure 50 can be fixed in the side tube portion 2'.

In this embodiment, the discharge lamp glass pipe 80 as shown in FIG. 12 is used, but instead of this, a glass pipe 80 as shown in FIG. 16 can be used. In the glass pipe 80 shown in FIG. 16,
Around the boundary between the side tube portion 2'and the arc tube portion 1 ', the side tube portion 2'
A small diameter portion 83 having an inner diameter smaller than that of the other portion is provided. The small diameter portion 83 is also called a leading. The inner diameter d of the small diameter portion 83 is set to a size such that the glass tube 70 stops, and is, for example, about 1.8 mm. The dimension of the region h in which the small diameter portion 83 is formed (the dimension in the longitudinal direction of the side tube portion 2 ′) is, for example, about 1 to 2 mm. The small diameter portion 83 is the glass pipe 80 shown in FIG.
It is formed by irradiating a predetermined portion (region h) with a laser to heat the portion. In this embodiment, the pipe 80 is depressurized (for example, the Ar pressure is 10 ⁻³ Pa).
Although the small diameter portion 83 is formed as described above, the small diameter portion 83 can be formed even under the atmospheric pressure as long as the area h can be shrunk. By providing the glass pipe 80 with the small diameter portion 83, the step of inserting the glass tube 70 is facilitated. That is, it becomes easy to fix the glass tube 70 at a predetermined position.

The electrode structure 50 can be inserted into the side tube portion 2'in the following manner. As shown in FIG.
The electrode structure 50 is passed through the one side tube portion 2'and the electrode rod 3
Position the tip 12 of the inside of the arc tube portion 1 '. At this time,
Since the Mo tape 11 comes into contact with the inner wall of the side tube portion 2 ′ and some resistance is required to pass through the electrode structure 50, the tungsten tape that has been thoroughly cleaned is used to move the electrode structure 50 to a predetermined position. Push in. When the electrode structure 50 is pushed in to a predetermined position, the Mo tape 11 fixes the electrode structure 50 at that position. FIG. 18 shows a cross-sectional structure taken along line cc of FIG.

Next, both ends of the glass pipe 80 after inserting the electrode structure 50 are attached to the rotatable chuck 82 while maintaining airtightness. The chuck 82 is connected to a vacuum system (not shown) and can depressurize the inside of the glass pipe 80. After evacuation of the glass pipe 80, 200to
A rare gas (Ar) of about rr (about 20 kPa) is introduced. After that, the glass pipe 80 is rotated in the direction of the arrow 81 with the electrode rod 3 as the rotation center axis.

Next, the side tube portion 2'and the glass tube 70 are heated and shrunk to seal the electrode structure 50, and as shown in FIG. Inside the glass part 8, the sealing part 2 provided with the second glass part 7 which was the glass tube 70 is formed. The sealing portion 2 is formed in order from the boundary portion between the arc tube portion 1 ′ and the side tube portion 2 ′ to near the middle of the outer lead 5 in order.
Then, the glass tube 70 is heated to shrink it. By this sealing portion forming step, the sealing portion 2 including the portion where the compressive stress is applied at least in the longitudinal direction (axial direction of the electrode rod 3) is obtained from the side tube portion 2 ′ and the glass tube 70. It should be noted that heating / shrinking may be performed from the outer lead 5 toward the arc tube portion 1 ′.
After that, a predetermined amount of mercury 6 is introduced from the open end of the side tube portion 2 '. At this time, halogen (for example, CH ₂ Br ₂ ) is also introduced, if necessary.

After the introduction of the mercury 6, the same process as above is performed for the other side tube portion 2 '. That is, after inserting the electrode structure 50 into the side tube portion 2 ′ which is not yet sealed, the inside of the glass pipe 80 is evacuated (preferably,
The pressure is reduced to about 10 ⁻⁴ Pa), the rare gas is sealed, and then heat sealing is performed. At this time, the heat sealing is preferably performed while cooling the arc tube portion 1 in order to prevent mercury from evaporating. In this way, by sealing both side tube portions 2 ', the lamp 100 shown in FIG. 1 is completed.

Next, with reference to FIGS. 20A and 20B, a mechanism in which a compressive stress is applied to the second glass portion 7 (or a peripheral portion thereof) in the sealing portion forming step will be described. . It should be noted that this mechanism has been inferred by the inventor of the present application, and it cannot be said that this mechanism is always used. However, as shown in FIG. 3A, for example, it is a fact that a compressive stress (compressive strain) exists in the second glass portion 7 (or the peripheral portion thereof), and the compressive stress is applied. It is a fact that the withstand voltage is improved by the sealing portion 2 including the broken portion.

FIG. 20 (a) shows that the second glass portion 7 in the state of the glass tube 70 is provided inside the first glass portion 8 in the state of the side tube portion 2 '.
20A schematically shows the cross-sectional structure at the time of inserting a, while FIG. 20B is a cross-sectional view at the time when the second glass portion 7a is softened into the molten state 7b in the structure of FIG. 20A. The configuration is schematically shown. In the present embodiment, the first glass portion 8 is made of quartz glass containing 99 wt% or more of SiO ₂ , and the second glass portion 7a is made of Vycor glass.

First, as a premise, the presence of compressive stress (compressive strain) often results in a difference in the coefficient of thermal expansion between materials in contact with each other. That is, it is generally considered that the reason why the compressive stress is applied to the second glass portion 7 provided in the sealing portion 2 is that there is a difference in thermal expansion coefficient between the two. But in this case, in fact,
It can be said that there is no big difference in the coefficient of thermal expansion between the two and they are almost equal. More specifically, the thermal expansion coefficients of the metals tungsten and molybdenum are about 46 ×, respectively.
Wherein 10 ⁻⁷ / ° C. and about 37 to 53 × 10 ⁻⁷ / ° C., the coefficient of thermal expansion of the quartz glass forming the first glass part 8 is about 5.5 × 10 ⁻⁷ / ° C., The thermal expansion coefficient of Vycor glass is about 7 × 10 ⁻⁷ / ° C., which can be regarded as the same level as the thermal expansion coefficient of quartz glass. The difference in coefficient of thermal expansion is about this much, and there is about 10k between them.
It is unlikely that a compressive stress of gf / cm ² or more will occur.
The difference in properties between the two lies in the softening point or strain point rather than the coefficient of thermal expansion, and it can be explained that compressive stress is applied by the following mechanism by focusing on this point. The softening point and strain point of quartz glass are 1650 ° C. and 1070 ° C., respectively (the annealing point is 1150 ° C.).
C.), while the softening and strain points of Vycor glass are 1530.degree. C. and 890.degree. C. (annealing point is 1020.degree. C.), respectively.

From the state shown in FIG. 20A, when the first glass portion 8 (side tube portion 2 ') is heated and shrunk from the outside, the gap 7c existing between the two is first filled,
Both touch. After shrinking, FIG. 20 (b)
As shown in, even when the first glass part 8 having a high softening point and a large area exposed to the outside air is released from the softened state first (that is, when it solidifies), The second glass portion 7b having a low softening point still remains softened (in a molten state). The second glass portion 7b at this time has fluidity as compared with the first glass portion 8, and the thermal expansion coefficients of both are almost the same during normal times (when not in a softened state). However, it is considered that the properties (for example, elastic modulus, viscosity, density, etc.) of both of them at this point are greatly different. Then, when further time passes, the second glass portion 7b having fluidity cools, and when the temperature of the second glass portion 7b also falls below the softening point, the second glass portion 7 also becomes It solidifies like the glass part 8. Here, if the softening points of the first glass portion 8 and the second glass portion 7 are the same, cooling is gradually performed from the outside so that no compressive strain remains,
Although both glass parts may harden, in the case of the configuration of the present embodiment, the outer glass part (8) hardens early, and after a while, the inner glass part (7) hardens.
It seems that the compressive strain remains in the second glass portion 7 on the inner side. Considering this, it may be said that the second glass portion 7 is in a state where a kind of pinching is indirectly performed.

If such a compressive strain remains, the contact state of both (7, 8) will usually end at a certain temperature due to the difference in thermal expansion coefficient between the two. In the case of the configuration of the present embodiment, since the thermal expansion coefficients of the two are almost the same, it is presumed that the close contact state of both (7, 8) can be maintained even if there is compressive strain.

Further, about 10 kgf is added to the second glass portion 7.
In order to give a compressive stress of not less than / cm ² to the lamp (lamp completed body) completed by the above-mentioned manufacturing method,
It was found necessary to heat at 1030 ° C. for 2 hours or more. Specifically, one completed lamp 100
It may be put in a furnace at 030 ° C. and annealed (for example, vacuum baking or reduced pressure baking). The temperature of 1030 ° C is an example, and the second glass portion (Vycor glass) is used.
The temperature may be higher than the strain point temperature of 7. That is,
The strain point temperature of Vycor may be higher than 890 ° C.
The preferred range is higher than the strain point temperature of Vycor of 890 ° C. and the strain point temperature (SiO 2) of the first glass portion (quartz glass).
₂ is lower than the strain point temperature of 1070 ° C), but 1
In some cases, the effect was obtained when the inventor of the present application conducted an experiment at a temperature of about 080 ° C or 1200 ° C.

For comparison, the high-pressure discharge lamp that was not annealed was measured by the sensitive color plate method. As a result, the high-pressure discharge lamp was provided with the second glass portion 7 in the sealing portion. However, a compressive stress of about 10 kgf / cm ² or more was not observed in the sealed portion.

The annealing (or vacuum baking) time is 2 hours or more, and there is no particular upper limit except the upper limit from the economical viewpoint. A suitable time may be set as appropriate within the range of 2 hours or more. Further, if the effect is exhibited even in less than 2 hours, heat treatment (annealing) in less than 2 hours may be performed. By this annealing step, the lamp may be highly purified, in other words, impurities may be reduced. This is because it is thought that by annealing the completed lamp body, it is possible to remove water (eg, water in Vycor) that is considered to adversely affect the lamp from the lamp. If annealing is performed for 100 hours or more, it is possible to almost completely remove the moisture in the vycor from the inside of the lamp.

In the above description, the second glass portion 7 is made of Vycor glass. However, SiO ₂ :
62% by weight, Al ₂ O ₃ : 13.8% by weight, CuO: 2
Glass containing 3.7% by weight (trade name: SCY2,
Made by SEMCOM. It was also found that even when the second glass part 7 was constructed from a strain point of 520 ° C., a compressive stress was applied at least in the longitudinal direction.

Next, FIG. 21 shows a mechanism that compressive stress is applied to the second glass portion 7 of the lamp when the completed lamp body is annealed at a predetermined temperature for a predetermined time or longer, which is inferred by the inventor of the present invention. It will be explained with reference to FIG.

First, as shown in FIG. 21A, a completed lamp body is prepared. The method for manufacturing the completed lamp is as described above.

Next, when the completed lamp is heated, mercury (Hg) 6 starts to evaporate, as a result, as shown in FIG. 21 (b), and as a result, the inside of the arc tube 1 and the second glass portion 7 are also heated. Pressure is applied. The arrow in the figure represents the pressure of the vapor of mercury 6 (for example, 100 atm or more). The reason why the vapor pressure of mercury 6 is applied not only to the inside of the arc tube 1 but also to the second glass portion 7 is that a gap 13 that is invisible to the eye is formed in the electrode rod 3.
This is because it is in the sealed portion of.

When the heating temperature is further raised and the heating is continued at a temperature exceeding the strain point of the second glass portion 7 (for example, 1030 ° C.), the second glass portion 7 is in a soft state and the vapor pressure of mercury is increased. Is applied to the second glass portion 7, a compressive stress is generated in the second glass portion 7. It is estimated that the time for the compressive stress to occur is, for example, about 4 hours when heated at the strain point and about 15 minutes when heated at the annealing point. This time is derived from the definitions of strain point and annealing point. That is, the strain point means the temperature at which the internal strain can be substantially removed by keeping this temperature for 4 hours, and the annealing point means
The above time is presumed because it means the temperature at which the internal stress can be substantially removed when kept at this temperature for 15 minutes.

Next, heating is stopped and the completed lamp is cooled. After the heating is stopped, as shown in FIG. 21 (c), since the mercury is still evaporated, the temperature of the second glass portion 7 becomes lower than the strain point while continuing to receive the pressure of the mercury vapor, and as a result, The compressive stress remains in the second glass portion 7.

Finally, when cooling proceeds to about room temperature, as shown in FIG.
As shown in FIG. 1 (d), a lamp 100 having a compressive stress of about 10 kgf / cm ² or more in the second glass portion 7 can be obtained. As shown in FIGS. 21 (b) and 21 (c), the vapor pressure of mercury exerts a pressure on both the second glass portions 7, and according to this method, about 10 kgf is applied to both the sealing portions 2.
A compressive stress of / cm ² or more can be reliably applied.

This heating profile is schematically shown in FIG. First, when heating is started (time O), then the second
Reaches the temperature of the strain point (T ₂ ) of the glass part 7 (time A). Next, at a temperature between the strain point of the second glass portion 7 (T ₂₎ and the strain point of the first glass portion 8 (T _1), holding the lamp a predetermined time. This temperature range can be basically regarded as a range in which only the second glass part 7 can be deformed.
During this holding, as shown in the schematic view of FIG. 23, a compressive stress is applied to the second glass portion 7 by the mercury vapor pressure (for example, 100 atm or more).

It should be noted that applying pressure to the second glass portion 7 by mercury vapor pressure seems to be the most effective method for utilizing the annealing treatment, but the lamp is used in the temperature range from T _{2 to} T ₁ in FIG. If you are holding a second
If some force can be applied to the glass portion 7 of the second glass portion 7, it is possible to apply a compressive stress to the second glass portion 7 not only by the mercury vapor pressure but also by the force (for example, by pushing the outer lead 5). I guess.

Next, when the heating is stopped, the lamp cools down, and after the time B, the temperature of the second glass portion 7 becomes the strain point (T
₂ ) below. Below the strain point (T ₂ ), the compressive stress of the second glass portion 7 remains. In this embodiment,
After holding at 1030 ℃ for 150 hours, cooling (natural cooling)
By doing so, the compressive stress of the second glass part 7 is applied and left.

Since the compressive stress is generated by the mercury vapor pressure by the mechanism as described above, the magnitude of the compressive stress is
It depends on the mercury vapor pressure (in other words, the amount of enclosed mercury). FIG. 24 shows the relationship between the amount of mercury in the arc tube 1 and the compressive stress.

It has a second glass portion 7 and has a mercury content of 19
0,220,230,240,270,290,330
The mg / cc lamps are respectively 7, 8, 8, 8,
We made 7, 8 and 6 lamps each and heated the lamps (annealed
To generate a compressive stress. Amount of mercury
Is 190 mg / cc, 5 out of 7 (7
1.4%) to 0 kgf / cm², And two (28.
6%) to 10.2 kgf / cm² The compressive stress of
It was When the amount of mercury is increased to 330 mg / cc
Is 10.2 kgf / cm in 3 out of 6 (50%)²,
And 20.4 kgf / c for the remaining three (50%)
m²The compressive stress was observed. In this way, the amount of mercury is high.
The compressive stress tends to increase as
It was

Generally, as the amount of mercury increases, the lamp is more likely to burst. However, when the sealing structure of the present embodiment is used, the compressive stress increases and the breakdown voltage improves as the amount of mercury increases. That is, according to the configuration of the present embodiment, a higher breakdown voltage structure can be realized as the amount of mercury increases, and thus stable lighting with an extremely high breakdown voltage, which cannot be realized by the current technology, is enabled. .

Further, the inventor of the present application has found that when the lamp finished body is vacuum baked (annealed) at 1080 ° C., which exceeds the strain point of Vycor glass, for 150 hours, the metal foil 4 is broken. . Alternatively, a phenomenon in which wrinkles were formed on the metal foil 4 was also observed. Therefore, the inventor of the present application conducted an experiment in order to investigate the conditions under which the metal foil 4 was broken. The results are shown in Table 1 below.

[0165]

[Table 1]

Explaining the terms in Table 1, "foil width" and "foil thickness" are the width and thickness of the metal foil 4, respectively, and "glass length" is the length of the second glass portion 7. The length of the direction. “Bake temperature” and “bake time” are the temperature and time during vacuum baking, respectively.

The breakage of the foil was observed under the conditions I and IX.
Met. From this result, when vacuum baking is performed at 1080 ° C., the glass length is preferably less than 7 mm (for example, 5 mm or less). Also, in the case of this experimental example,
No foil breaks were observed upon vacuum baking at 1030 ° C. Therefore, the vacuum bake is preferably performed at a temperature below 1080 ° C. (for example, 1030 ° C. ± 40 ° C.).

Next, referring to FIGS. 25 to 29,
Another method of manufacturing the lamp 100 according to this embodiment will be described.

First, as shown in FIG. 25, a glass tube 70 to be the second glass portion 7 is prepared. The glass tube 70 shown in FIG. 25 is a Vycor glass tube, and its dimensions are an outer diameter (D1) of 1.9 mm and an inner diameter (D2) of 1.7 m.
m, length (L) 100 mm. As shown in FIG. 26, the electrode structure 50 including the electrode rod 3 is inserted into the glass tube 70, and then both sides of the glass tube 70 are attached to a rotatable chuck 82 while maintaining airtightness. The structure of the electrode structure 50 is as described in FIG.
The chuck 82 is connected to a vacuum system (not shown),
The inside of the glass tube 70 can be evacuated.

After the inside of the glass tube 70 is evacuated, a reduced pressure rare gas (for example, 20 kPa) is filled. next,
After rotating the glass tube 70 about the electrode rod 3 as an axis, a portion 72 of the glass tube 70 corresponding to the external lead 5 is heated and shrunk to have a structure shown in FIG. Then, the glass tube 70 shown in FIG. 27 is cut along the lines a and b in the figure and processed as shown in FIG. The portion to be shrunk may be a part of the electrode rod 3 or a part of the metal foil 4, instead of a part of the external lead 5.

Next, as shown in FIG. 29, the glass tube 70
The attached electrode structure 50 is inserted into one side tube portion 2 ′ of the glass pipe 80. Specifically, using a cleaned tungsten rod, the electrode structure 50 is pushed to a predetermined position of the side tube portion 2'and fixed. When the clasp 11 of the electrode structure 50 having a width slightly larger than 2 mm is used, it can be easily fixed at a predetermined position of the side tube portion 2 '.

Next, both sides of the glass pipe 80 are attached to a rotatable chuck (not shown) while maintaining airtightness. Then, similarly to the manufacturing method of the above-described embodiment (see FIGS. 17 and 19), the inside of the pipe 80 is evacuated and a rare gas is filled therein, and then the glass pipe is drawn in the direction of the arrow 81 with the electrode rod 3 as the axis. Rotate 80, then arc tube section 1 '
From the vicinity of the boundary between the side tube portion 2 ′ and the side tube portion 2 ′ to the vicinity of the middle of the outer lead 5, heating is sequentially performed to shrink the outer lead 5.
In this way, the electrode structure 50 with the glass tube 70 is sealed. Then, from the side of the open side tube, a specified amount of mercury (for example, about 200 mg / cc or 300
Introduce about mg / cc or more). After the introduction of mercury, the electrode structure 50 with the glass tube 70 is inserted into the other side tube portion 2 ′ by the same method as described above. Then, after evacuation, a rare gas is sealed and heat sealed. As mentioned above, this heat-sealing prevents the evaporation of mercury.
It is preferable to perform it while cooling the arc tube portion 1. By this manufacturing method, the lamp 100 having the structure shown in FIG. 11 is obtained. Also in this embodiment, the compressive strain can be increased by sealing both the side tube portions 2 ′ and then heating at 1030 ° C. for 2 hours or more.

The manufacturing method described above is based on FIG.
You may perform like (d).

First, the Vycor glass tube 70 shown in FIG. 25 has a predetermined length (for example, about 20 mm or less, or
After cutting to about 17 mm to about 19 mm), FIG.
As shown in, one end of the glass tube 70 is heated by a heating means (for example, a burner or a laser) to shrink. The reason why the diameter of one end of the glass tube 70 is made small is to make it a fixed portion to the electrode structure (in particular, metal foil) to be inserted into the glass tube 70. Since it is difficult to attach a fixing means to the glass member, such a device is very useful,
Improve work efficiency.

Next, as shown in FIG. 30B, the electrode structure 50 is vertically inserted into the glass tube 70. Since the small diameter portion is formed in the glass tube 70, the electrode structure 5
0 and the glass tube 70 can be easily set at predetermined positions.

Next, as shown in FIG. 30C, a molybdenum tape (alias, ribbon) 11 is welded to one end of the electrode structure 50. Then, the electrode structure 50 with the glass tube 70 is inserted into the side tube portion 2 ′ of the glass pipe 80, and then a predetermined portion is sealed. By repeating the same for the other side tube portion 2 ', the lamp according to the embodiment of the present invention can be manufactured.

25 to 29 and FIG. 30 (a) to FIG.
Since the manufacturing method shown in (d) uses a longer Vycor glass tube than the short Vycor glass tube shown in FIG. 13, these manufacturing methods may be referred to as a long Vycor method. On the other hand, the manufacturing method using the short Vycor glass tube shown in FIGS. 12 to 19 may be called a short Vycor method.

Note that the Vycor glass tube 70 having the dimensions shown in FIG. 25 for use in the manufacturing method of this embodiment.
Is not commercially available and must be manufactured from a commercially available Vycor glass tube through predetermined steps. In this embodiment, rather than mechanically processing a commercially available Vycor glass tube by polishing or the like, heating (baking) a Vycor glass tube having a large diameter, pulling the tube, and pulling the tube from the original glass tube Vycor glass tube 7 with a small diameter
It is preferable to make 0. The reason is that since Vycor glass has hygroscopicity, the Vycor glass tube before processing contains water, and it is good to remove the water in the heating and drawing steps. To further explain, the water contained in the Vycor glass tube becomes an impurity, which causes deterioration of the lamp characteristics by deteriorating the compressive stress during the lamp manufacturing process or causing bubbles. Because you get it. Also,
There is also an advantage that when the Vycor glass is drawn while being baked, the glass composition tends to be uniform.

By the resizing process of the Vycor glass tube 70, the original tube having an outer diameter and an inner diameter of about 15 mm and about 13 mm respectively has an outer diameter and an inner diameter of about 1.6 to 2.0 mm and about 1.2 mm. ~ 1.5 mm. The thickness of the glass tube 70 after resizing is about 0.1 m
m.

Next, another manufacturing method will be described with reference to FIGS. 31 (a) to 31 (c). In the manufacturing method of the above embodiment, the glass tube made of Vycor was used,
Here, a lamp is manufactured using a glass plate made of Vycor.

First, as shown in FIG. 31A, two Vycor glass plates 72 and an electrode structure 50 are prepared. Next, as shown in FIG. 31B, the electrode structure 50
The metal foil 4 is placed so as to be sandwiched between the two glass plates 72. Then, as shown in FIG. 31C, the electrode structure 50 sandwiched between the two glass plates 72 is connected to the glass pipe 8
It is inserted in the side tube part 2 ′ of 0, and then a predetermined part is sealed. Even in this way, the lamp according to the embodiment of the present invention can be manufactured. This method may be called the Bicall board method.

Further, the manufacturing method as shown in FIGS. 32 (a) and 32 (b) can be adopted.

First, as shown in FIG. 32 (a), a Vycor glass tube (inner tube) 7 is placed in a quartz tube (outer tube) 74.
0 is placed, and the electrode structure 50 is placed in the Vycor glass tube 70.

Here, the area 76 around the metal foil 4 of the electrode structure 50 is heated to shrink the outer tube 74 and the inner tube 70, and a double tube as shown in FIG. 32 (b) is provided. The electrode structure 50 is produced. In the shrinking step, the outer tube 74 and the inner tube 70 may be heated in a vacuum, and then the glass tube may be cut into a predetermined size.

The electrode structure 50 with a double tube shown in FIG. 32 (b) is inserted into the side tube portion 2'of the glass pipe 80,
After that, if the predetermined portions are sealed, the lamp according to the embodiment of the present invention can be manufactured. This method may be called a triple shrink method because a triple tube structure lamp is finally obtained. The lamp manufactured by this method has the advantage that impurities can be prevented from seeping out from the Vycor glass while the lamp is lit because the Vycor glass is covered with quartz glass.

As a method of arranging the Vycor glass tube 70 in the side tube portion 2'of the glass pipe 80, in the above embodiment, the small diameter portion 83 as shown in FIG. 16 is used in the side tube portion 2 '.
Although the glass tube 70 is formed and fixed to the glass tube 70, the invention is not limited to this and another fixing method may be adopted. For example, the glass tube 70 may be baked and fixed to the inner surface of the side tube portion 2 ′, or the glass tube 70 may be attached to the inner surface of the side tube portion 2 ′ by an adhesive (for example, an organic binder, nitrocellulose, PEO (polyethylene). (Oxide) or the like). In addition, static electricity or magnetic force may be used. Even when the small diameter portion 83 is formed, in addition to the small diameter portion 83 at the position shown in FIG. 16, another small diameter portion can be fixed so that both the front and the rear of the Vicor pipe 70 can be stopped and fixed. May be formed. In addition, a small quartz tube is attached to the front of the Bicor tube 70 (on the side of the arc tube) in the side tube section 2 ', and the Vicor tube 70 is attached to the side tube section 2'by the quartz tube.
It is also possible to fix it inside. Such a quartz tube is
It may be fixed by reading, or a coil may be attached to a part of the electrode rod 3 and fixed by the coil.

Further, as a method of fixing the Vycor glass tube 70 to the electrode structure 50, in FIG. 28, one end of the glass tube 70 is shrunk so as to be in contact with the external lead (for example, molybdenum rod) 5 and fixed. However, the present invention is not limited to this, and other fixing means may be adopted. For example, as shown in FIG. 30B, one end of the shrinkable glass tube 70 may be hooked on the metal foil 4. Further, a small glass tube (beat tube) may be interposed and fixed between the shrinked one end and one end of the metal foil 4 (end portion on the external lead 5 side). Furthermore, the shrinkable portion of the glass tube 70 is easily caught on the metal foil 4, and the portion of the metal foil 4 near the external leads is formed in a wavy shape or a sawtooth shape so that it can be more stably fixed. Good.

In order to further improve the pressure resistance of the lamp 100 of this embodiment, as in the lamp 200 shown in FIG. 33, at least a part of the surface of the electrode rod 3 embedded in the sealing portion 2 has a surface. A metal film (for example, Pt film) 3
It is preferable to form 0. The metal film 30 is made of P
It may be composed of at least one metal selected from the group consisting of t, Ir, Rh, Ru and Re. From the viewpoint of adhesion, the lower layer is an Au layer and the upper layer is, for example, a Pt layer. It is preferable.

In the lamp 200, since the metal film 30 is formed on the surface of the electrode rod 3 which is embedded in the sealing portion 2, a minute crack is generated in the glass around the electrode rod 3. Can be prevented. That is, in the lamp 200, in addition to the effect obtained by the lamp 100, the effect of preventing the occurrence of cracks is also obtained, and thereby the pressure strength can be further improved. The crack generation preventing effect will be described below.

The metal film 3 is formed on the electrode rod 3 located in the sealing portion 2.
In the case of a lamp having no zero, after the glass of the sealing portion 2 and the electrode rod 3 are brought into close contact with each other once during the formation of the sealing portion in the lamp manufacturing process, both of them may be cooled at the time of cooling due to the difference in their thermal expansion coefficients. Will be separated. At this time, a crack is generated in the quartz glass around the electrode rod 3. Due to the existence of the cracks, the pressure resistance is lower than that of an ideal lamp having no cracks.

In the case of the lamp 200 shown in FIG. 33, since the metal film 30 having the Pt layer on the surface is formed on the surface of the electrode rod 3, the quartz glass of the sealing portion 2 and the surface of the electrode rod 3 ( The wettability with the Pt layer) is poor. In other words, the combination of platinum and quartz glass is better than the combination of tungsten and quartz glass.
Since the wettability between the metal and the quartz glass is deteriorated, the two are easily attached to each other without being stuck. As a result, due to the poor wettability between the electrode rod 3 and the quartz glass, the electrode rod 3 and the quartz glass are well separated from each other during cooling after heating, and it becomes possible to prevent the generation of fine cracks. The lamp 200 manufactured based on the technical idea of preventing the occurrence of cracks by utilizing such poor wettability is the lamp 10
It shows a pressure resistance higher than 0.

The lamp 200 shown in FIG. 33 may be replaced with a lamp 300 shown in FIG. In the lamp 300, in the configuration of the lamp 100 shown in FIG. 1, the coil 40 whose surface is covered with the metal film 30 is
It is wound around the surface of the electrode rod 3 which is embedded in the sealing portion 2. In other words, the lamp 300
The coil 40 having at least the surface of at least one metal selected from the group consisting of Pt, Ir, Rh, Ru and Re is wound around the base of the electrode rod 3. In the configuration shown in FIG. 34, the coil 40 is
It is wound even up to the portion of the electrode rod 3 located in the discharge space 10 of the arc tube 1. Also in the configuration of the lamp 300 shown in FIG. 34, the electrode rod 3 is formed by the metal film 30 on the surface of the coil 40.
The wettability with the quartz glass can be deteriorated, and as a result, generation of fine cracks can be prevented. The metal on the surface of the coil 40 may be formed by plating, for example. From the viewpoint of adhesiveness, it is preferable to first form the lower Au layer on the coil 40 and then to form the upper Pt layer, for example. However, even if the coil 40 is plated only with Pt instead of the two-layer structure of Pt (upper layer) / Au (lower layer) plating, sufficient practical adhesion can be secured.

In the case of a structure in which at least one metal selected from the group consisting of Pt, Ir, Rh, Ru and Re (also referred to as “Pt etc.”) is provided on the surface of the electrode rod 3 or the surface of the coil 40. In the above, as in the configuration of the embodiment of the present invention, the presence of the second glass portion 7 around the metal foil 4 is very significant. This will be explained further. Since metals such as Pt may evaporate to some extent due to heating during processing in the lamp manufacturing process (sealing process), if they diffuse to the metal foil 4, the adhesion between the metal foil and glass is weakened. This may result in lowering the breakdown voltage. However, if the second glass portion 7 is provided around the metal foil 4 and a compressive strain is present therein as in the configuration of the present embodiment, the poor wettability between Pt or the like and the glass is no longer present. Irrelevant, and as a result, Pt
It is possible to prevent a decrease in breakdown voltage caused by diffusion of the like.

Next, the lamps 100 and 2 of this embodiment will be described.
The compressive strength of No. 00 will be described. FIG. 35 schematically shows a lamp configuration when a pressure resistance test using hydrostatic pressure is performed on the lamp of the present embodiment. In the pressure resistance test using hydrostatic pressure, as shown in FIG.
It has the same configuration as the sealing portion 2 of the lamp 100 shown in FIG. 1 or the sealing portion 2 of the lamps 200 and 300 shown in FIGS. 33 and 34. The other sealing portion is left in the state of the side tube portion 2 ', and water is added from one end of the opened side tube portion 2'to apply water pressure to increase the pressure resistance of the lamp. taking measurement. More specifically, pure water is introduced from the opened side tube portion 2 ', a hydrostatic pressure is applied, and the pressure is gradually increased. The value of hydrostatic pressure when the lamp bursts is defined as the pressure resistance of the lamp (pressure resistance due to hydrostatic pressure).

Seven lamps 100 of the present embodiment,
Five lamps 200, a lamp of a comparative example (see FIG. 2)
FIG. 36 shows the result of performing a withstand voltage test on 9 pieces (see (b)). FIG. 36 is a Weibull plot showing the relationship between breakdown voltage and damage probability. In FIG. 36, the larger the value on the horizontal axis, the larger the breakdown voltage, and the larger the gradient (that is, the closer to the vertical), the smaller the variation in breakdown voltage.

As can be seen from FIG. 36, the damage probability is 50.
% Is 21 MPa in the comparative example, whereas
The lamp 100 has a pressure of 25.3 MPa, and the lamp 200
Then, it increased to 28.5 MPa. Lamp 100
The withstand voltage of 200 and 200 (withstand pressure by hydrostatic pressure) is a high withstand voltage that cannot be reached even by the conventional lamp having excellent withstand pressure. Further, even if the inclination is observed, the lamp 100 of the present embodiment is
It can be seen that and 200 are larger than those of the comparative example, and therefore there is less variation in breakdown voltage.

It is generally known that the lighting operation pressure is higher than the withstand voltage obtained by the withstand voltage test.
The reason why the lighting operation pressure is higher is as follows. When the lamp is lit and heated, the glass of the arc tube will thermally expand, but in reality, due to the structure of the lamp, the glass of the arc tube cannot freely expand, and as a result, A contracting force is applied to the arc tube. Due to the contracting force, that is, the force of returning, the lighting operation pressure becomes higher than the withstand voltage obtained by the withstand voltage test. When evaluated at the lighting operating pressure, the operating pressure of the lamp 100 can be set to 30 MPa or more, and the operating pressure of the lamp 200 can be set to 40 MPa or more. On the other hand, the operating pressure of the lamp of the comparative example is 30M.
If it is set to Pa, it will burst.

FIG. 37 shows the remaining rate with respect to the lighting time for the lamp of the comparative example (configuration shown in FIG. 49) and the lamp of the embodiment of the present invention (lamp of the present invention. For example, the configuration shown in FIG. 34). ing. 10 lamps of the comparative example and 13 lamps of the present invention were used for lighting operation pressure of 40 MPa,
When the lamp of Comparative Example was turned on at 120 W, 50% or more of the lamps of the comparative example were damaged within 100 hours of the lighting time. The residual rate was shown. This result is
Considering that the conventional lamp currently used at an operating pressure of 20 MPa has a residual rate of 50% for 2000 hours, it can be seen that the lamp of the present invention is very excellent.
In addition, the configuration of the present invention prevents the 30M
It also means that it is possible to provide a lamp that can be stably operated even at a very high operating pressure of Pa or higher.

FIG. 38 shows the relationship between the position of the second glass portion 7 and the burst rate during initial lighting (5 hours). Group a is a connecting portion (welding portion) between the electrode rod 3 and the metal foil 4.
The second glass portion 7 is arranged so as to cover the second glass portion 7 and the group b represents the other portion. In the upper lamp of the group a, the second glass portion 7 covers the connecting portion between the electrode rod 3 and the metal foil 4, and the end surface of the second glass portion 7 on the external lead 5 side is located on the metal foil 4. On the other hand, the lower lamp is
The second glass portion 7 is arranged so as to cover the entire metal foil 4.

When each lamp was initially turned on at an operating pressure of 350 atm for 5 hours, 56 lamps (n = 56) in group a and 21 lamps (n = 21 in group b) were initially lit. Was 0%, whereas the burst rate of the lamp of group b was 43%. Therefore, to cover the connecting portion (welding portion) between the electrode rod 3 and the metal foil 4,
It is preferable to arrange the second glass portion 7.

Since there has never been a high-pressure discharge lamp which operates at a lighting operating pressure of 30 MPa or more, it is very interesting to see what the spectral characteristics are when the operating pressure is extremely increased. It has been revealed that the average color rendering index Ra and the illuminance are significantly improved when the operating pressure is set to 30 MPa or more. The results will be described below.

FIG. 39 shows a spectral distribution when the lamp of this embodiment is operated at a lighting operation pressure of 40 MPa. And FIG. 40 shows the spectral distribution when the lamp of the present embodiment is operated at a lighting operation pressure of 19 MPa. On the other hand, FIG. 41 shows a conventional lamp (made by Philips).
Is shown as a reference for the spectral distribution when it is turned on at an operating pressure of 20 MPa and 120 W. The spectral distributions shown in FIGS. 39 to 41 are actual measurement data.

Looking at FIG. 39 in comparison with FIG. 40 and FIG. 41, in the case of a lamp having an operating pressure of 40 MPa, 405 n
It was found that the ratio of the bright lines near m, 436 nm, 546 nm, and 547 nm was small. Further, paying attention to the average color rendering index Ra, in the example shown in FIG. 39, Ra showed a very high value of 70.7. On the other hand, in the example shown in FIG. 40, Ra is 60.2, and
In the example shown in FIG. For reference, other characteristics of the examples shown in FIGS. 39 to 41 are as follows. R9 to R15 are special color rendering evaluation numbers.

The example shown in FIG. 39 (operating pressure 40 MPa, R
a = 70.7): chromaticity value (x, y) = (0.2935, 0.2967), Tc = 8370
K, D _UV = -3.4 R9 = -11.0, R10 = 34.4, R11 = 56.7, R12 = 58.6, R13 = 66.3, R14 = 84.1, R15 = 66.8 Example shown in FIG. 40 (operating pressure 19 MPa, Ra = 60.2) : Chromaticity value (x, y) = (0.2934, 0.3030), Tc = 8193
K, D _UV = 0.1 R9 = -53.3, R10 = 11.6, R11 = 42.0, R12 = 41.9, R13 = 54.0, R14 = 79.0, R15 = 52.4 Example shown in FIG. 41 (operating pressure 20 MPa, Ra = 59.4): Chromaticity value (x, y) = (0.2895, 0.3010), Tc = 8574
K, D _UV = 1.3 R9 = -53.2, R10 = 9.9, R11 = 40.9, R12 = 41.5, R13 = 52.8, R14 = 78.5, R15 = 50.8 Next, regarding the relationship between the average color rendering index Ra and the lighting operating pressure. explain. FIG. 42 is a graph showing the lighting operation pressure dependency of Ra.

As can be seen from FIG. 42, Ra increases as the lighting operation pressure increases. Operating pressure is 19M
Ra increased from Pa to 40 MPa, Ra increased by about 14%. Ra of conventional ultra-high pressure mercury lamp is at most 60
(65 in some cases) while Ra is 65
If it can be made larger, the versatility of the lamp will be greatly expanded. That is, where Ra of the fluorescent lamp is 61 and Ra of the fluorescent mercury lamp is 40 to 50, if Ra of the ultra-high pressure mercury lamp can be made larger than 65, a highly efficient metal halide lamp (for example, This is because it can be positively used for the purpose of Ra65 to 70). When the Ra of the ultra-high pressure mercury lamp is set to 70 or more, it can be used not only for industrial work but also for offices, so that the versatility of the lamp is greatly enhanced. Therefore,
The average color rendering index Ra of the lamp of this embodiment is, for example,
It is more preferable that the value is larger than 65, or 67 or more and 70 or more. The color temperature of this lamp (super high pressure mercury lamp) is 8000K or higher, and the color temperature is 80
Lamps with Ra of greater than 65 above 00K do not yet exist at this time. A metal halide lamp having a very high Ra has a relatively low color temperature, and a light bulb also has a relatively low color temperature. Color temperature of 8000K or higher, Ra of 65
The lamp of the present embodiment, which exceeds the above, can be an artificial solar light source (artificial solar device or artificial solar system), or close to it, and is a breakthrough that can generate new demand that does not yet exist today. It is a lamp.

Further, the lamps 100 and 200 of this embodiment can be combined with a reflecting mirror to form a lamp with a mirror or a lamp unit.

FIG. 43 schematically shows a cross section of a lamp 900 with a mirror provided with the lamp 100 of the present embodiment.

The lamp 900 with a mirror includes a lamp 100 having a substantially spherical arc tube 1 and a pair of sealing portions 2, and a reflecting mirror 60 for reflecting the light emitted from the lamp 100. Note that the lamp 100 is an example, and the lamp 200 may of course be used. Also, a lamp with mirror 900
May further include a lamp house that holds the reflecting mirror 60. Here, the structure provided with the lamp house is included in the lamp unit.

The reflecting mirror 60 is, for example, a parallel light flux, a condensed light flux that converges in a predetermined minute area, or a divergent light flux equivalent to that diverged from a predetermined minute area.
00 to reflect the emitted light. As the reflecting mirror 60, for example, a parabolic mirror or an ellipsoidal mirror can be used.

In the present embodiment, the cap 56 is attached to one sealing portion 2 of the lamp 100, and the sealing portion 2
The external lead (5) extending from the base and the base 56 are electrically connected. The sealing portion 2 and the reflecting mirror 60 are fixed and integrated with, for example, an inorganic adhesive (for example, cement). An extraction lead wire 65 is electrically connected to the external lead 5 of the sealing portion 2 located on the front opening side of the reflection mirror 60, and the extraction lead wire 65 extends from the lead wire 5 to the reflection mirror 60. It extends to the outside of the reflecting mirror 60 through the lead wire opening 62. A front glass can be attached to the front opening of the reflecting mirror 60, for example.

Such a lamp with a mirror or a lamp unit can be attached to an image projection device such as a projector using liquid crystal or DMD, and is used as a light source for the image projection device. In addition, such a lamp or lamp unit with a mirror and an image device (DM
An image projection apparatus can be configured by combining with an optical system including a D (Digital Micromirror Device) panel or a liquid crystal panel. For example, a projector using a DMD (digital light processing (D
LP) projector and liquid crystal projector (LCOS)
It also includes reflective projectors that employ a (Liquid Crystal on Silicon) structure. ) Can be provided. Furthermore, the lamp and the lamp or lamp unit with a mirror of this embodiment are used for a light source for an ultraviolet stepper, a light source for a competition stadium, a headlight of an automobile, a floodlight for illuminating a road sign, in addition to a light source for an image projection device. It can also be used as a light source.

Next, the relationship between the lighting operation pressure and the illuminance in the lamp of this embodiment will be described.

FIG. 44 is a graph showing the relationship between operating pressure (MPa) and average illuminance (lx). This illuminance was measured as follows. A lamp is installed in the reflecting mirror as shown in FIG. 43, and the screen is divided into nine surfaces of equal area while the screen is irradiated with light using an appropriate optical system, and the illuminance at the center of each surface. Was measured.
The average value of the nine illuminances was taken as the average illuminance of the lamp, which was used as an index of the illuminance of the lamp.

As can be seen from FIG. 44, the illuminance also increases as the operating pressure increases. Operating pressure is 19M
By increasing from Pa to 40MPa, the illuminance becomes about 14
% Improved. Therefore, if a 40 MPa lamp is used, a brighter image projection device than before can be realized. In recent years, there has been a strong demand for the brightness of the screen.
Being able to improve% also has the implication that it can be one of the breakthroughs of existing technologies. (Other Embodiments) In the above embodiment, a mercury lamp using mercury as a light emitting substance has been described as an example of a high pressure discharge lamp, but in the present invention, the airtightness of the arc tube is maintained by the sealing portion (sealing portion). It can be applied to any high-pressure discharge lamp having a configuration. For example, it can be applied to a metal halide lamp in which a metal halide is enclosed and a high pressure discharge lamp such as xenon. This is because the higher the breakdown voltage of the metal halide lamp and the like, the better. That is, it is possible to realize a highly reliable and long-life lamp by preventing leaks and cracks. Further, when the configuration of the above embodiment is applied to a metal halide lamp in which not only mercury but also a metal halide is enclosed, the following effects can be obtained. That is, by providing the second glass part 7, the adhesion of the metal foil 4 in the sealing part 2 can be improved, and the reaction between the metal foil 4 and the metal halide (or halogen and alkali metal). Can be suppressed, and as a result, the reliability of the structure of the sealing portion can be improved. In particular, when the second glass portion 7 is located in the portion of the metal rod 3 as in the configuration shown in FIG. 1, FIG. 8 or FIG. The second glass portion 7 can effectively reduce the intrusion of the metal halide that enters the small gap between them and reacts with the metal foil 4 and causes the embrittlement of the foil. As described above, the configuration of the above-described embodiment can be suitably applied to the metal halide lamp.

In recent years, a mercury-free metal halide lamp that does not contain mercury has been developed, but the technique of the above-described embodiment can be applied to such a mercury-free metal halide lamp. The details will be described below.

The mercury-free metal halide lamp to which the technique of the above embodiment is applied is shown in FIG.
In the structure shown in FIG. 2, the arc tube 1 is substantially free of mercury and at least the first halide, the second halide, and the rare gas are sealed. Can be mentioned. At this time, the metal of the first halide is a luminescent substance, and the metal of the second halide is the first.
Is a halide of one or more kinds of metals having a larger vapor pressure than the above-mentioned halide and less likely to emit light in the visible region as compared with the metal of the first halide. For example, the first halide is sodium,
It is one or more kinds of halides selected from the group consisting of scandium and rare earth metals. And
The second halide is one or more halides of a metal that has a relatively high vapor pressure and is less likely to emit light in the visible region than the metal of the first halide. Specific second halides include Mg and F
e, Co, Cr, Zn, Ni, Mn, Al, Sb, B
It is a halide of at least one metal selected from the group consisting of e, Re, Ga, Ti, Zr and Hf. A second halide containing at least a Zn halide is more preferable.

Another example of the combination is a translucent arc tube (airtight container) 1, a pair of electrodes 3 provided in the arc tube 1, and a pair of seals connected to the arc tube 1. Stop 2
In the arc tube 1 in mercury-free metal halide lamp with bets, ScI ₃ is a light-emitting substance (scandium iodide) and NaI (sodium iodide), InI ₃ (indium iodide) is a mercury alternative materials and TlI
(Thallium iodide) and a rare gas (for example, Xe gas of 1.4 MPa) as a starting auxiliary gas are enclosed. In this case, the first halide is ScI ₃
(Scandium iodide), NaI (sodium iodide)
And the second halide becomes InI ₃ (indium iodide) and TlI (thallium iodide). Since the second halide has a relatively high vapor pressure and plays a role of mercury instead of InI ₃ (indium iodide) or the like, for example, Zn iodide is used. May be.

The reason why the technique of Embodiment 1 can be preferably applied to such a mercury-free metal halide lamp will be described below.

First, in the case of a mercury-free metal halide lamp using a substitute for Hg (such as a halide of Zn),
Efficiency is reduced compared to mercury-containing lamps. To increase the efficiency, it is very advantageous to increase the lighting operation pressure. In the case of the lamp of the above-described embodiment, since the structure has an improved breakdown voltage, the rare gas can be charged at a high pressure, and the efficiency can be easily improved, so that a practical mercury-free metal halide lamp can be easily realized. be able to.
In this case, Xe, which has a low thermal conductivity, is preferable as the rare gas.

In the case of a mercury-free metal halide lamp, it is necessary to enclose a larger amount of halogen than a mercury-containing metal halide lamp because mercury is not enclosed. Therefore, the amount of halogen that reaches the metal foil 4 through the gap near the electrode rod 3 also increases, and the halogen reacts with the metal foil 4 (in some cases, the root portion of the electrode rod 3).
The structure of the sealing portion becomes weak and leaks easily occur. Figure 3
3 and FIG. 34, since the surface of the electrode rod 3 is covered with the metal film 30 (or the coil 40), the reaction between the electrode rod 3 and halogen can be effectively prevented. Further, as shown in FIG. 1, in the case where the second glass portion 7 is located around the electrode rod 3, the second glass portion 7 allows halide (for example, halide of Sc) to enter. It is possible to prevent the occurrence of leaks and thereby prevent the occurrence of leaks. Therefore, in the case of the mercury-free metal halide lamp having the structure of the above embodiment, higher efficiency and longer life can be achieved as compared with the conventional mercury-free metal halide lamp. This is generally true of lamps for general lighting. When it comes to lamps for vehicle headlights, there are the following additional advantages.

When used as a vehicle headlight, turn the switch off.
There is a demand to obtain 100% of light at the next moment. To meet this demand, rare gas (specifically, X gas
It is effective to encapsulate e) at high pressure. However, if Xe is sealed at a high pressure with a normal metal halide lamp, the possibility of bursting increases. This is not preferable as a lamp for a headlight that requires a higher degree of safety. That is, a failure of the headlight at night leads to a car accident. In the case of the mercury-free metal halide lamp having the structure of the above-described embodiment, the structure has an improved pressure resistance, and therefore, even when such high-pressure Xe is sealed, safety is ensured and the startability of lighting is improved. Can be improved. Further, since it has a long life, it can be more suitably applied as a headlight.

Further, in the above-described embodiment, the case where the mercury vapor pressure is about 20 MPa or about 30 MPa or more (so-called ultra-high pressure mercury lamp) has been described. However, as described above, high pressure mercury with a mercury vapor pressure of about 1 MPa is used. It does not preclude its application to lamps. That is,
It is applicable to all high-pressure discharge lamps including ultra-high pressure mercury lamps and high-pressure mercury lamps. The mercury vapor pressure of what is called today's ultra-high pressure mercury lamp is 15MP.
a or more (the amount of enclosed mercury is 150 mg / cc or more).

The fact that the lamp can be stably operated even when the operating pressure is extremely high means that the reliability of the lamp is high. Is less than about 30 MPa,
For example, when applied to about 20 MPa to about 1 MPa), the reliability of the lamp operating at the operating pressure can be improved.

The technical significance of the lamp capable of realizing high withstand pressure strength will be further described as follows. In recent years, in order to obtain a high-power and high-power high-pressure mercury lamp, a short arc type mercury lamp having a short arc length (distance between electrodes) (for example, an electrode distance of 2 mm or less) is being developed. In the case of the short arc type, it is necessary to enclose a larger amount of mercury than usual in order to prevent the evaporation of the electrode from accelerating as the current increases. As described above, in the conventional configuration, there is an upper limit in the pressure resistance strength, and therefore, there is an upper limit in the enclosed mercury amount (for example, about 200 mg / cc or less), and it is possible to realize a lamp that exhibits further excellent characteristics. There were restrictions. The lamp of the present embodiment can remove such a limitation in the related art, and can promote the development of a lamp exhibiting excellent characteristics that could not be realized in the related art. In the lamp of the present embodiment, the amount of enclosed mercury is 200 mg /
It is possible to realize a lamp of about 300 mg / cc or more, which exceeds about cc.

As mentioned above, the amount of enclosed mercury is 30.
A technology capable of realizing about 0 to 400 mg / cc or more (lighting operation pressure of 30 to 40 MPa) means that a lamp having a level exceeding a lighting operation pressure of 20 MPa (that is, a lighting operation pressure exceeding a lamp of today's 15 MPa to 20 MPa). Lamps having, for example, a lamp having a pressure of 23 MPa or more or 25 MPa or more) also has the significance of ensuring its safety and reliability. That is, when a large number of lamps are mass-produced, the characteristics of the lamps may inevitably vary. Therefore, even if the lamp has a lighting operating pressure of about 23 MPa, it is necessary to secure a withstand voltage with a margin in mind. The technology capable of achieving a withstand voltage of 30 MPa or more has a great advantage from the viewpoint of being able to actually supply a product even for a lamp of less than 30 MPa. Needless to say, if a lamp that can withstand a pressure of 23 MPa or less is manufactured using a technique capable of achieving a withstand voltage of 30 MPa or higher, safety and reliability can be improved.

Therefore, the structure of the present embodiment can improve the lamp characteristics in terms of reliability and the like. In addition, in the lamp of the above embodiment, the sealing portion 2
Was manufactured by the shrink method, but it may be manufactured by the pinching method. Although the double-end type high-pressure discharge lamp has been described, the technique of the above-described embodiment can be applied to a single-end type discharge lamp.
In addition, in the said embodiment, although the 2nd glass part 7 was formed from the glass tube (70) made from Vycor, for example, it does not necessarily need to form from a glass tube. The structure is not limited to the structure that covers the entire circumference of the metal foil 4, and the glass structure is not limited to a glass tube as long as it is a glass structure that can contact the metal foil 4 and cause compressive stress to exist in a part of the sealing portion 2. For example, glass tube 7
A glass structure having a "C" shape with a slit formed in a part of 0 is also used. For example, a carat (glass piece) made of Vycor is arranged so as to contact one side or both sides of the metal foil 4. Alternatively, for example, glass fibers made of Vycor may be arranged so as to cover the periphery of the metal foil 4. However, even if a glass powder, for example, a sintered glass body formed by compressing and sintering glass powder, is used instead of the glass structure, a compressive stress may exist in a part of the sealing portion 2. No glass powder is available because it cannot.

In addition, the interval (arc length) between the pair of electrodes 3 may be a short arc type or may be longer than that. The lamp according to the above-described embodiment can be used in either an AC lighting type or a DC lighting type of lighting method. Further, the configurations and modified examples shown in the above embodiment can be mutually adopted. Although the sealing portion structure including the metal foil 4 has been described, the configuration of the above embodiment can be applied to the foilless sealing portion structure. This is because it is important to increase the breakdown voltage and the reliability even in the case of a foil-free sealing portion structure. More specifically, the electrode structure 50
As one, one electrode rod (tungsten rod) 3 is used as an electrode structure without using the molybdenum foil 4. The second glass portion 7 is arranged on at least a part of the electrode rod 3, and
It is also possible to form the first glass portion 8 so as to cover the glass portion 7 and the electrode rod 3 and to construct the sealing portion structure. In the case of this configuration, the external lead 5 can also be configured by the electrode rod 3.

Although the discharge lamp has been described in the above-mentioned embodiments, the technique of the first embodiment is not limited to the discharge lamp, but may be any lamp having a structure in which the sealing portion (seal portion) maintains the airtightness of the arc tube. For example, it can be applied to a lamp (for example, a light bulb) other than the discharge lamp. Embodiment 1
45 and 46 show a light bulb to which the technique of FIG.

The light bulb 500 shown in FIG. 45 is a double-end type light bulb (for example, a halogen light bulb) in which the filament 9 is provided inside the arc tube 1 in the configuration shown in FIG. The filament 9 is connected to the inner lead (internal lead-in wire) 3a. An anchor may be provided in the arc tube 1.

The light bulb 600 shown in FIG. 46 is a single-end type light bulb, as can be seen from the figure. In this example, a single-ended halogen bulb is shown. The light bulb 600 includes, for example, a quartz glass bulb 1 and a sealing portion 2.
(First glass portion 8, second glass portion 7, molybdenum foil 4), filament 9, inner lead 31, anchor 32, outer lead (external lead-in wire) 5, insulator 51, and base 52. Even with such a halogen light bulb, the problem of bursting is an important issue, and the technical significance of being able to prevent the bursting by the technique of Embodiment 1 is great.

The preferred examples of the present invention have been described above, but the description is not a limitation and, of course, various modifications are possible.

The following are known techniques in which the structure of the sealing portion is devised. Figure 4
7 and 48 show a lamp 2000 disclosed in Japanese Patent Laid-Open No. 6-208831 (corresponding US Pat. No. 5,468,168). In the lamp 2000, the sealing and supporting means for the lead wire for accurately positioning the light emitting means of the lamp is devised.

The lamp 2000 shown in FIG. 47 comprises an envelope 201 made of quartz glass which surrounds the internal space 210 for light generation, and a conductive lead wire structure 250 protruding into the internal space 210. Figure 4
8 shows an enlarged view of the structure of the conductive lead wire structure 250.

The conductive lead wire structure 250 has a tip 212.
An electrode rod 203, a metal foil 204, and an external lead wire 205, which are surrounded by a main body 208 formed by compressing and sintering particles of a vitreous material, It is sealed. This main body 208
Extends through an opening in the envelope 201 that communicates with the interior space 210 such that a seal is formed in the interface region between the envelope 201 and the body, between the envelope 201 and the body. ing.

In this lamp 2000, inside the leg portion 202, the main body portion 208 formed by compressing and sintering the particles of the vitreous material is located, thereby sealing the opening portion of the envelope 201. However, unlike the lamp 100 of the present embodiment, the configuration is not provided with the sealing portion including the second glass portion 7 with compressive strain. Therefore, the two have different basic configurations.

More specifically, the lamp 2000
Then, the main body portion 208 is formed of fused silica powder and the leg portions 202 are formed of fused silica so that the thermal expansion coefficients of both are substantially the same. In this case, since the both have almost the same composition, no compressive strain is introduced into the main body portion 208. The publication also discloses a method of manufacturing the main body 208 from a porous base material made of a vitreous material such as Vycor glass sintered quartz, but a main body made from such a porous base material. Even if the portion 208 is provided in the leg portion 202, there is no reason why the compressive strain in the electrode axial direction remains in the main body portion 208, and in fact, the compressive strain remains in the main body portion 208 of the lamp 2000 disclosed in the publication. There is no mention or suggestion of what to do.

[0237] This publication teaches that the thermal expansion coefficients of the periphery and the main body 208 are made to match each other in order to obtain a highly reliable hermetically sealed seal.
It seems that it has been suggested that the composition of the and surroundings be as uniform as possible. Then, even if the particles of the vitreous material are compression-molded and sintered to dispose the glass portion on the center side and shrink the glass portion from the outside by the side tube portion 2'as in the present embodiment, the glass tube Unlike (70), in the sintered body in which the particles are formed by compression, the particles are dispersed, and instead of the residual compressive strain (compressive stress), the glass of the sintered body is added to the glass portion of the side tube portion 2 ′. This is because the powder is dispersed with a concentration gradient.

[0238]

According to the present invention, the first part constituting the side tube portion is formed.
Glass member made of a second glass having a lower softening point than that of the glass, is inserted into the side tube portion, and then the side tube portion is heated to bring the glass member and the side tube portion into close contact with each other. Two
Is higher than the strain point temperature of the glass of, and lower than the strain point temperature of the first glass, by performing a step of heating a portion including at least the glass member and the side tube portion, compressive stress It is possible to manufacture a high pressure discharge lamp including a sealing portion having a portion to which is applied.
In this high-pressure discharge lamp, a portion to which compressive stress is applied is formed, so that the pressure resistance is improved.

[Brief description of drawings]

1A and 1B are cross-sectional views schematically showing a configuration of a high pressure discharge lamp 100 according to an embodiment of the present invention.

2 (a) and 2 (b) are principal part enlarged views schematically showing the distribution of compressive strain along the longitudinal direction (electrode axis direction) of the sealing part 2. FIG.

3 (a) and 3 (b) are drawings-substituting photographs showing the distribution of the compressive strain of a lamp measured using a sensitive color plate method utilizing the photoelastic effect.

4 (a) and (b) are respectively FIG. 3 (a).
It is a trace diagram about and (b).

5A and 5B are diagrams for explaining the principle of strain measurement by the sensitive color plate method utilizing the photoelastic effect.

FIG. 6 is a graph showing the relationship between stress [kgf / cm ² ] and the number of lamps [pieces].

7 (a) and 7 (b) are enlarged views of relevant parts for explaining the reason that the compressive strength of the second glass part 7 increases the compressive strength of the lamp 100. FIG.

FIG. 8 is an enlarged view of a main part schematically showing a modified example of the lamp 100.

FIG. 9 is an enlarged view of a main part schematically showing a modified example of the lamp 100.

FIG. 10 is an enlarged view of a main part schematically showing a modified example of the lamp 100.

FIG. 11 is an enlarged view of a main part schematically showing a modified example of the lamp 100.

FIG. 12 is a cross-sectional view schematically showing the structure of a discharge lamp glass pipe 80.

FIG. 13 is a sectional view schematically showing the structure of a glass tube 70.

FIG. 14 shows the glass tube 7 on the side tube portion 2 ′ of the glass pipe 80.
FIG. 6 is a process cross-sectional view for explaining a process of fixing 0.

FIG. 15 is a diagram schematically showing a configuration of an electrode structure 50.

FIG. 16 is a cross-sectional view schematically showing the structure of a glass pipe 80 provided with a small diameter portion 83.

FIG. 17 is a process cross-sectional view illustrating the step of inserting the electrode structure 50.

18 is a cross-sectional view taken along the line cc in FIG.

FIG. 19 is a process sectional view for explaining a sealing portion forming process.

20 (a) and 20 (b) are cross-sectional views for explaining a mechanism in which a compressive strain is introduced into the second glass portion 7.

21A to 21D are cross-sectional views for explaining a mechanism in which a compressive stress is applied by annealing.

FIG. 22 is a graph schematically showing a profile of a heating process (annealing process).

FIG. 23 is a schematic diagram for explaining a mechanism in which a compressive stress is applied to the second glass portion 7 by the mercury vapor pressure.

FIG. 24 is a graph showing the relationship between the amount of mercury in the arc tube and the compressive stress.

FIG. 25 is a cross-sectional view schematically showing the structure of the glass tube 70.

FIG. 26 is a process sectional view for explaining a process of inserting the electrode structure 50 into the glass tube 70.

FIG. 27 is a process sectional view for explaining a process of shrinking the glass tube 70.

FIG. 28 is a cross-sectional view schematically showing the configuration of an electrode structure 50 with a glass tube 70.

29 is a process cross-sectional view for explaining a process of inserting the electrode structure 50 with the glass tube 70 into the side tube portion 2 ′ of the glass pipe 80. FIG.

30A to 30D are process cross-sectional views for explaining a manufacturing method according to another embodiment of the present invention.

31A to 31C are process cross-sectional views for explaining a manufacturing method according to another embodiment of the present invention.

32A and 32B are process cross-sectional views for explaining a manufacturing method according to another embodiment of the present invention.

FIG. 33 is a high pressure discharge lamp 2 according to an embodiment of the present invention.
It is sectional drawing which shows the structure of 00 typically.

FIG. 34 is a high-pressure discharge lamp 3 according to an embodiment of the present invention.
It is sectional drawing which shows the structure of 00 typically.

FIG. 35 is a cross-sectional view schematically showing the configuration of a lamp when performing a pressure resistance test using hydrostatic pressure.

FIG. 36 is a Weibull plot showing the relationship between breakdown voltage and damage probability.

FIG. 37 is a graph showing a remaining rate with respect to lighting time.

FIG. 38 shows the position of the second glass part 7 and the initial lighting (5
Time) burst rate.

FIG. 39 is a graph showing a spectral distribution when operated at a lighting operation pressure of 40 MPa.

FIG. 40 is a graph showing a spectral distribution when operated at a lighting operation pressure of 19 MPa.

FIG. 41 is a graph showing a spectral distribution of a conventional lamp.

FIG. 42 is a graph showing the relationship between the average color rendering index Ra and the lighting operation pressure.

FIG. 43 is a cross-sectional view schematically showing the configuration of a lamp with a mirror 900.

FIG. 44 is a graph showing the relationship between operating pressure (MPa) and average illuminance (lx).

FIG. 45 is a cross-sectional view schematically showing the configuration of the light bulb 500.

FIG. 46 is a perspective view schematically showing the configuration of a light bulb 600.

FIG. 47 is a sectional view schematically showing a configuration of a conventional lamp 2000.

48 is an enlarged view of a main part of the conductive lead wire structure 250. FIG.

FIG. 49 is a cross-sectional view schematically showing the configuration of a conventional high pressure mercury lamp.

[Explanation of symbols]

1 arc tube 1'arc tube 2 Sealing part 2'side tube 3 electrode rod 4 metal foil 5 External lead 6 Luminescent substance (mercury) 7 Second glass part 8 First glass part 9 filament 10 Discharge space (inside tube) 11 Support member 12 coils 20 Strain boundary area 50 electrode structure 56 mouthpiece 60 reflector 62 Lead wire opening 65 lead wire 70 glass tubes 80 Glass pipe for discharge lamp 82 Chuck 100, 200, 300 High-pressure discharge lamp 500,600 bulbs (halogen bulbs) 900 Lamp with mirror (lamp unit) 1000 super high pressure mercury lamp 2000 lamp

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01J 9/395 H01J 61/30 R 61/20 61/36 B 61/30 F21Y 101: 00 61/36 F21M 1/00 M // F21Y 101: 00 3/02 G (72) Inventor Yuriko Kaneko 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Makoto Horiuchi 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Makoto Kai 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Ichibankase Go 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72 ) Inventor Tomoyuki Seki 1006, Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F term (reference) 3K042 AA01 AA08 AC06 BB01 BB03 BB05 BE01 CA01 5C012 AA08 FF01 LL01 RR00 5C043 AA20 BB04 CC03 DD15 EC01

Claims (40)

[Claims] 1. An arc tube in which a luminescent material is enclosed,
A method for manufacturing a high-pressure discharge lamp, comprising: a sealing portion for maintaining the airtightness of the arc tube, comprising: an arc tube part which becomes the arc tube of the high-pressure discharge lamp; and a side tube part extending from the arc tube part. A step of preparing a glass pipe for a discharge lamp having, and inserting a glass member composed of a second glass having a lower softening point than the first glass forming the side tube into the side tube, A step of heating the side tube portion to bring the glass member and the side tube portion into close contact with each other; and, after the attaching step, higher than a strain point temperature of the second glass, and the first glass And a step of heating a portion including at least the glass member and the side tube portion at a temperature lower than the strain point temperature of 1. 2. The glass member comprises 15% by weight or less of A.
The method for producing a high pressure discharge lamp according to claim 1, wherein the glass tube or glass plate is made of SiO ₂ and at least one of 1 ₂ O ₃ and 4% by weight or less of B. 3. A luminous tube in which a luminous substance is enclosed,
A method of manufacturing a high-pressure discharge lamp having a pair of sealing parts extending from both ends of the arc tube, the arc tube being a light-emitting tube of the high-pressure discharge lamp, and a pair extending from both ends of the arc tube. And a step of preparing a glass tube for a discharge lamp having a side tube portion of one of the side tube portion of the pair of side tube portion of the softening point than the first glass constituting the side tube portion. One of the pair of sealing parts is inserted by inserting a glass tube composed of a low second glass and an electrode structure including at least an electrode rod, and then heat-shrinking the side tube part. A step of forming a sealing part, a step of forming the one sealing part, and then introducing a luminescent substance into the arc tube part, and a step of introducing the luminescent substance into the other side tube part with respect to the one A glass tube composed of the second glass,
Inserting an electrode structure including at least an electrode rod, and then heat-shrinking the side tube portion to form an arc tube in which the other sealing portion for the one side and the luminescent substance are encapsulated, At a temperature higher than the strain point temperature of the second glass and lower than the strain point temperature of the first glass with respect to the completed lamp body in which both the sealing parts and the arc tube are formed. And a step of heating a portion including at least the glass tube and the side tube portion, the method for manufacturing a high pressure discharge lamp. 4. The heating step is performed for 2 hours or more,
The method for manufacturing the high pressure discharge lamp according to claim 1. 5. The method for manufacturing a high pressure discharge lamp according to claim 4, wherein the heating step is performed for 100 hours or more. 6. By the heating, the glass tube, a boundary portion between the glass tube and the side tube portion, a portion of the glass tube on the side of the side tube portion, and the portion of the side tube portion. In the part selected from the group consisting of the part on the glass tube side,
A compressive stress of about 10 kgf / cm ² or more and about 50 kgf / cm ² or less occurs in at least the longitudinal direction of the side tube portion,
The method for manufacturing the high pressure discharge lamp according to claim 3. 7. For each of the pair of sealing portions,
The method for manufacturing a high pressure discharge lamp according to claim 6, wherein the compressive stress is generated. 8. The heating is carried out by placing the finished lamp in a furnace having a temperature above the strain point temperature of the second glass and below the strain point temperature of the first glass. The method for manufacturing a high pressure discharge lamp according to claim 3, wherein 9. The method for manufacturing a high pressure discharge lamp according to claim 8, wherein the inside of the furnace is in a vacuum or a reduced pressure state. 10. The first glass contains 99% SiO ₂ .
The second glass contains at least one of 15% by weight or less of Al ₂ O ₃ and 4% by weight or less of B, and SiO ₂
The method for manufacturing a high pressure discharge lamp according to claim 1, further comprising: 11. The high-pressure discharge lamp is a high-pressure mercury lamp, and mercury as the light-emitting substance is enclosed in an amount of 150 mg / cm ³ or more based on the internal volume of the arc tube.
0. The method for manufacturing a high pressure discharge lamp according to any one of 0. 12. The method for manufacturing a high pressure discharge lamp according to claim 11, wherein mercury is filled as the luminescent material in an amount of 220 mg / cm ³ or more based on the internal volume of the arc tube. 13. The method of manufacturing a high pressure discharge lamp according to claim 11, wherein mercury is filled as the light emitting substance in an amount of 300 mg / cm ³ or more based on the inner volume of the arc tube. 14. A method of manufacturing a high-pressure discharge lamp, comprising: a light-emitting tube in which a light-emitting substance is enclosed; and a sealing portion for maintaining the airtightness of the light-emitting tube, which is an arc tube of a high-pressure discharge lamp. A step of preparing a glass tube for a discharge lamp having an arc tube section and a side tube section extending from the arc tube section; inserting a glass tube into the side tube section; and then heating the side tube section. And a step of bringing them into close contact with each other, and inserting an electrode structure including at least an electrode rod into the glass tube in close contact with the side tube portion, and then heating and shrinking the side tube portion and the glass tube, After completing the step of sealing the electrode structure and the step of sealing the electrode structure, after completing the sealing part of the high-pressure discharge lamp, at a temperature higher than the strain point temperature of the glass tube. , Heating the sealed part for 2 hours or more It encompasses a degree, a manufacturing method of a high-pressure discharge lamp. 15. A step of inserting an electrode structure including at least an electrode rod into a glass tube; a step of bringing a part of the glass tube into close contact with at least a part of the electrode structure; Inserting the glass tube in which at least a part of the electrode structure is in close contact with the side tube portion of the glass tube for discharge lamp, which has a light emitting tube portion serving as an arc tube and a side tube portion extending from the light emitting tube portion The step of sealing the electrode structure by heating and shrinking the side tube portion and the glass tube, and the step of sealing the electrode structure A method of manufacturing a high-pressure discharge lamp, comprising the step of heating the sealing part at a temperature higher than the strain point temperature of the glass tube for 2 hours or more after the sealing part is completed. 16. The electrode structure according to claim 14, wherein the electrode structure includes the electrode rod, a metal foil connected to the electrode rod, and an external lead connected to the metal foil. Manufacturing method of high pressure discharge lamp of. 17. At least a part of the electrode rod is provided with P
The high pressure discharge lamp according to claim 14, wherein a metal film made of at least one metal selected from the group consisting of t, Ir, Rh, Ru, and Re is formed. Production method. 18. A coil having at least a surface of at least one metal selected from the group consisting of Pt, Ir, Rh, Ru and Re, wound around at least a part of the electrode rod. 17. The method for manufacturing a high pressure discharge lamp according to any one of 1 to 16. 19. A small-diameter portion in which the inner diameter of the side tube portion is smaller than that of the other portion is provided around the boundary between the side tube portion and the arc tube portion in the discharge lamp glass pipe. The method for manufacturing a high pressure discharge lamp according to any one of claims 14 to 18. 20. The side tube portion contains 99% by weight of SiO _2.
The glass tube is made of glass containing at least one of Al ₂ O ₃ of 15% by weight or less and B of 4% by weight or less, and SiO _2. The method of manufacturing a high pressure discharge lamp according to claim 14, wherein the heating step is performed at 1080 ° C. or lower. 21. A method of manufacturing a high pressure discharge lamp, comprising: an arc tube in which a luminescent material is enclosed; and a pair of sealing portions extending from both ends of the arc tube. And a step of preparing a glass tube for a discharge lamp having a pair of side tube portions extending from both ends of the arc tube portion, and one side tube portion of the pair of side tube portions. A glass tube made of a second glass having a softening point lower than that of the first glass forming the side tube portion, an electrode rod connected to one end of the metal foil, and an external lead connected to the other end of the metal foil. And an electrode structure formed by connecting the two, and then heat-shrinking the side tube portion to form one sealing portion of the pair of sealing portions, and the one sealing portion. A step of introducing a luminescent material into the arc tube portion after forming the stopper. After introducing the luminescent material, a glass tube made of the second glass in the other side tube portion with respect to the one,
Insert an electrode structure in which an electrode rod is connected to one end of the metal foil and an external lead is connected to the other end of the metal foil,
Next, a step of forming a light-emitting tube in which the other sealing portion for the one and the light-emitting substance are enclosed by heat-shrinking the side tube portion, and a lamp in which both the sealing portion and the light-emitting tube are formed A portion including at least the glass tube and the side tube portion at a temperature higher than the strain point temperature of the second glass and lower than the strain point temperature of the first glass with respect to the finished body. And a method of manufacturing a high-pressure discharge lamp, the method comprising: 22. In the step of forming the one sealing portion and the step of forming the other sealing portion, in the electrode structure, a connecting portion between the electrode rod and the metal foil is formed by the glass tube. 22. The method of manufacturing a high pressure discharge lamp according to claim 21, wherein the high pressure discharge lamp is inserted into the side tube portion so as to be covered and the tip of the electrode rod is located inside the arc tube portion. 23. In at least one of the step of forming the one sealing portion and the step of forming the other sealing portion, the metal foil of the electrode structure is entirely covered with the glass tube. 22. The method of manufacturing a high pressure discharge lamp according to claim 21, wherein the tip of the electrode rod is inserted into the side tube portion so as to be located inside the arc tube portion. 24. A small diameter portion is formed at one end of the glass tube, and the glass tube covers the metal foil so that the small diameter portion contacts a part of the metal foil. Item 23. A method for manufacturing a high pressure discharge lamp according to Item 23. 25. The method of manufacturing a high pressure discharge lamp according to claim 21, wherein the glass tube has a wall thickness of 0.1 mm or more and 1 mm or less. 26. The length in the longitudinal direction of the glass tube is 3
The method for manufacturing a high-pressure discharge lamp according to any one of claims 21 to 25, which has a size of at least mm and at most 7 mm. 27. The length in the longitudinal direction of the glass tube is 3
The method for manufacturing a high pressure discharge lamp according to any one of claims 21 to 25, which has a size of not less than 5 mm and not more than 5 mm. 28. A method of manufacturing a high pressure discharge lamp, comprising: an arc tube in which a luminescent material is enclosed; and a pair of sealing parts extending from both ends of the arc tube. And a step of preparing a glass tube for a discharge lamp having a pair of side tube portions extending from both ends of the arc tube portion, and one side tube portion of the pair of side tube portions. , A glass tube containing a second glass having a lower softening point than the first glass constituting the side tube portion, an electrode rod is connected to one end of the metal foil, and an external lead is connected to the other end of the metal foil. And a step of forming one sealing portion of the pair of sealing portions by heat-shrinking the side tube portion, and the one sealing portion. And then introducing a luminescent material into the arc tube portion, After introducing the optical substance, a glass tube containing the second glass is connected to the other side tube portion for the one side, an electrode rod is connected to one end of the metal foil, and an external lead is connected to the other end of the metal foil. And then insert the electrode structure,
A step of forming an arc tube in which the other sealing part for the one side and the light emitting material are sealed by heat-shrinking the side tube part, and a completed lamp body in which both the sealing parts and the arc tube are formed In contrast, at least a portion including the glass tube and the side tube portion is heated at a temperature higher than the strain point temperature of the second glass and lower than the strain point temperature of the first glass. Including the step of, the glass tube inserted into at least one side tube portion of the pair of side tube portions has at least a two-layer structure, and is located on the side facing the electrode structure. The high-pressure discharge in which the layer of the glass tube is made of the second glass, and the layer of the glass tube on the side facing the side tube portion is made of the first glass. Lamp manufacturing method. 29. The glass tube has a two-layer structure, and the inner layer of the glass tube is 15 wt% or less of Al ₂ O ₃
And at least one of B up to 4% by weight, and S
iO ₂ and glass, and the outer layer of the glass tube is composed of glass containing 99% by weight or more of SiO ₂ , and the glass tube is provided on each of the pair of side tube portions. 29. The method of manufacturing a high pressure discharge lamp according to claim 28, which is inserted. 30. The heating temperature is 1030 ° C. ± 40
The method for producing a high-pressure discharge lamp according to claim 21, wherein the high-pressure discharge lamp has a temperature of 0 ° C. 31. A method of manufacturing a high-pressure discharge lamp, comprising: a light-emitting tube in which a light-emitting substance is sealed in a tube; and a sealing portion for maintaining the airtightness of the light-emitting tube, which is an arc tube of a high-pressure discharge lamp. A step of preparing a glass pipe for a discharge lamp having an arc tube section and a side tube section extending from the arc tube section; and a second glass having a lower softening point than the first glass constituting the side tube section. A step of inserting a glass member made of glass into the side tube portion, then heating the side tube portion to bring the glass member and the side tube portion into close contact, and the second step after the close contact step Higher than the strain point temperature of the glass of, and at a temperature lower than the strain point temperature of the first glass, a step of holding a portion including at least the glass member and the side tube portion, of the holding step When applying pressure to the second glass part, Including bets, a manufacturing method of a high-pressure discharge lamp. 32. The method for manufacturing a high-pressure discharge lamp according to claim 21, wherein mercury is filled as the luminescent substance in an amount of 220 mg / cm ³ or more based on the internal volume of the arc tube. 33. An arc tube, in which a luminescent material is enclosed, and a pair of sealing parts for maintaining airtightness of the arc tube, wherein each of the pair of sealing parts extends from the arc tube. And a second glass part provided on at least a part of the inside of the first glass part, and each of the pair of sealing parts is compressed. There is a portion to which stress is applied, and the portion to which the compressive stress is applied is the second glass portion, the boundary portion between the second glass portion and the first glass portion, and the second glass portion. It is selected from the group consisting of a portion of the two glass portions on the side of the first glass portion and a portion of the first glass portion on the side of the second glass portion, and the compressive stress is applied. the compressive stress at the site is about 10 kgf / cm ² or more to about 50 kgf / m ² or less, the the light emitting tube, a pair of electrode rods are arranged opposite to each other, each of the electrode rods of said pair of electrode rods are connected to the metal foil, said metal foil A high-pressure discharge lamp provided in the sealing portion, and at least a connecting portion between the metal foil and the electrode rod is located in the second glass portion. 34. The high pressure discharge lamp according to claim 33, wherein all of the metal foil is located in the second glass portion. 35. The longitudinal length of the second glass portion is 3 mm or more and 5 mm or less when the end portion of the second glass portion is located on the metal foil. High pressure discharge lamp. 36. The high-voltage discharge according to claim 33, wherein a thickness of a portion of the second glass portion located on the metal foil is 0.1 mm or more and 1 mm or less. lamp. 37. The high-pressure discharge lamp is a high-pressure mercury lamp, and 150 mg / cm ³ or more of mercury is enclosed as the light-emitting substance based on the inner volume of the arc tube.
The high pressure discharge lamp according to any one of 3 to 36. 38. The high-pressure discharge lamp according to claim 37, wherein mercury as the luminescent substance is enclosed in 220 mg / cm ³ or more based on the internal volume of the arc tube. 39. The high-pressure discharge lamp according to claim 37, wherein mercury is filled as the luminescent substance in an amount of 300 mg / cm ³ or more based on the internal volume of the arc tube. 40. A lamp unit, comprising: the high pressure discharge lamp according to claim 33; and a reflecting mirror that reflects light emitted from the high pressure discharge lamp.