JP2007214069A - High-pressure discharge lamp, lamp unit, image display device, and manufacturing method of high-pressure discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp whereby a small lamp unit having high luminance can be manufactured. <P>SOLUTION: This high-pressure discharge lamp is equipped with a discharge vessel 2 composed of a body part 4 having a discharge space 6 in its inside and a sealing part 5 connectively provided at one spot of the body part 4, a pair of electrodes 8 one side ends of which are disposed in the discharge space 6 and the other end parts of which are sealed by the sealing part 5, a pair of metal foils 9 connected to the other end parts of the electrodes 8 respectively and sealed by the sealing part 5 with their main faces 12 almost facing each other, and a pair of external lead wires 10 connected to the metal foils 9 respectively and one end part side of which is derived to the outside of the sealing part 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-pressure discharge lamp such as a high-pressure mercury lamp, a lamp unit and an image display device including the high-pressure discharge lamp, and a method for manufacturing the high-pressure discharge lamp.

  In recent years, lamp units using high-pressure mercury lamps have been reduced in size and brightness. A so-called duffle-end high-pressure mercury lamp 200 shown in FIG. 16 (hereinafter referred to as “high-pressure mercury lamp 200 of conventional example 1”) includes a main body portion 201 and a pair of sealing portions connected to both sides of the main body portion 201. 202a and 202b, and a pair of sealing portions 202a and 202b is sealed with one electrode assembly 207 consisting of an electrode 204, a metal foil 205 and an external lead wire 206 one by one. Yes. For example, the high-pressure mercury lamp 200 is attached to a reflecting mirror 210 having a reflecting surface 211 and a lamp mounting hole 212 so that one sealing portion 202a is inserted into the lamp mounting hole 212, and used as the lamp unit 220. Is done. Such a lamp unit 220 has a longer overall length (dimension in the light emission direction) W2 because the other sealing portion 202b of the high-pressure mercury lamp 200 is positioned on the light emission direction side of the main body 201, and thus the lamp unit 220 is long. Is large.

  As a high-pressure mercury lamp that addresses such a problem, Patent Document 1 discloses a so-called single-ended high-pressure mercury lamp 300 (hereinafter referred to as “high-pressure mercury lamp 300 of Conventional Example 2”) as shown in FIG. It is disclosed. A high-pressure mercury lamp 300 according to Conventional Example 2 includes a discharge vessel 303 including a main body 301 and a sealing portion 302 that is continuously provided at one location of the main body 301, and the sealing portion 302 includes an electrode 304. The two electrode assemblies 307 including the metal foil 305 and the external lead wire 306 are sealed together.

In the high-pressure mercury lamp 300 of Conventional Example 2, when the lamp unit 320 is assembled so that the sealing portion 302 is inserted into the lamp mounting hole 312 of the reflecting mirror 310, the sealing portion is located on the light emission side from the main body portion 301. There is nothing. Therefore, the total length W3 of the lamp unit 320 according to the conventional example 2 is shorter than the total length W2 of the lamp unit 220 according to the conventional example 1, and the lamp unit 320 according to the conventional example 2 is smaller than that of the conventional example 1.
JP 2002-100433 A

By the way, the discharge vessel 203 of the high-pressure mercury lamp 200 of Conventional Example 1 is manufactured using a glass tube 230 whose outer diameter and inner diameter are indicated by a two-dot chain line in FIG. The inner diameter of the glass tube 230 is slightly larger than the width of the metal foil 205.
On the other hand, the discharge vessel 303 of the high-pressure mercury lamp 300 of Conventional Example 2 is manufactured using a glass tube 330 whose outer diameter and inner diameter are indicated by a two-dot chain line in FIG. The inner diameter of the glass tube 330 is such a size that the two electrode assemblies 307 can be inserted in a posture in which they are arranged in parallel so that one main surface of the metal foil 305 is included in substantially one plane. .

  Since the glass tube 330 according to Conventional Example 2 has a larger diameter than that of Conventional Example 1, the sealing portion 302 formed by heating and shrinking the glass tube 330 is also larger than that of Conventional Example 1. That is, the width D5 of the sealing portion 302 according to Conventional Example 2 shown in FIG. 19 is larger than the width D4 of the sealing portion 202a according to Conventional Example 1 shown in FIG. In addition, since the thickness of the glass tube suitable for producing the discharge vessel is determined to some extent, when the inner diameter of the glass tube is increased, the glass tube inevitably becomes larger.

When the sealing portion 302 is large in this way, the lamp mounting hole 312 provided in the center of the reflecting surface 311 has to be enlarged correspondingly, and accordingly, the area of the reflecting surface 311 is reduced, and the lamp unit. The brightness of 320 decreases.
In view of the above-described problems, the present invention provides a high-pressure discharge lamp capable of producing a small and high-luminance lamp unit, a lamp unit and an image display device including the high-pressure discharge lamp, and a method for manufacturing the high-pressure discharge lamp. The purpose is to provide.

  In order to achieve the above object, a high-pressure discharge lamp according to the present invention comprises a discharge vessel comprising a main body having a discharge space therein, a sealing portion continuously provided at one place of the main body, and one end. A portion is disposed in the discharge space, the other end is connected to the pair of electrodes sealed by the sealing portion, and the other end of the electrodes, and the main surfaces are substantially opposed to each other. It has a configuration comprising a pair of metal foils sealed in the sealing part and a pair of external lead wires connected to the metal foils and having one end portion led out of the sealing part.

  Since the high-pressure discharge lamp according to the present invention is a so-called single-end type high-pressure discharge lamp, when the lamp unit is manufactured by being attached to a reflecting mirror, the light emission of the main body is made like a so-called double-end type high-pressure discharge lamp. The sealing part is not positioned on the direction side. Therefore, the overall length of the lamp unit can be shortened, and the lamp unit can be made smaller. Further, since the pair of metal foils sealed in the sealing portion are arranged in a state where their main surfaces are substantially opposed to each other, the main surfaces are arranged in a state where the main surfaces are included in substantially one plane. Compared to the conventional single-ended high-pressure discharge lamp, the sealing portion is small. Therefore, the lamp mounting hole for inserting the sealing portion can be made small, and a wide reflecting surface can be secured by pulling, so that a lamp unit with high brightness can be manufactured.

Here, the pair of metal foils can be configured such that the distance D1 between the main surfaces facing each other is substantially constant over substantially the entire region between the main surfaces. With this configuration, since the sealing portion can be made smaller, a lamp unit with higher luminance can be manufactured.
Here, it can be set as the structure by which the heat retention film | membrane is formed in the said sealing part side in the outer surface of the said main-body part. With this configuration, the temperature of the coldest spot generated in the main body of the discharge vessel can be increased, and a high-pressure discharge lamp with higher luminance can be obtained.

  Each of the pair of electrodes has a proximity portion whose distance is reduced between a root portion and the one end portion of the portion protruding into the discharge space, and the distance between the proximity portions. L1 can be configured to be shorter than the distance L2 between the root portions and longer than the distance L3 between the one end portions. According to this configuration, since the discharge can be generated between the adjacent portions at the time of starting the lamp, the starting of the lamp can be facilitated.

  Further, the pair of external lead wires can be configured such that at least the sealing portion side in the portion led out of the sealing portion is covered with an electrically insulating coating. With this configuration, since the electrical insulation between the external lead wires is ensured, there is no possibility of short-circuiting and the safety is high, and the voltage does not leak and the lamp does not become pointless. Further, the pair of external lead wires can be arranged closer to each other, and the electrode assembly including the external lead wire can be arranged closer to each other, so that the sealing portion can be made smaller.

  Further, when the shortest distance between portions of the pair of external lead wires led out of the sealing portion is D2 [mm] and the starting pulse voltage of the combined lighting circuit is V [kV], D2 [mm ] ≧ 0.4 × V [kV]. With this configuration, it is possible to prevent a short circuit and a defect without performing an electrical insulation process on the external lead wire.

A lamp unit according to the present invention includes the high-pressure discharge lamp and a reflecting mirror having a reflecting surface that reflects light emitted from the high-pressure discharge lamp. Therefore, it can be set as a small and high-intensity lamp unit.
The image display apparatus according to the present invention has a configuration including the high-pressure discharge lamp. Therefore, it is possible to provide a small and high-luminance image display device.

  A method of manufacturing a high-pressure discharge lamp according to the present invention includes a main body having a discharge space therein, a discharge vessel including a sealing portion continuously provided at one place of the main body, and one end of the discharge vessel A pair of electrodes disposed in the space, a pair of metal foils connected to the other end side of the electrodes, and a pair of external lead wires respectively connected to the pair of metal foils. A method for manufacturing a high-pressure discharge lamp comprising a pair of electrode assemblies sealed to a stop portion, the body portion forming planned portion serving as the body portion, and the sealing portion forming schedule serving as the sealing portion A first step of preparing a glass tube having a portion, and inserting the pair of electrode assemblies into the sealing portion formation scheduled portion so that the principal surfaces of the pair of metal foils are substantially opposed to each other Heating and shrinking the second step to be performed and the sealing portion formation scheduled portion Characterized in that it comprises a third step of sealing the electrode assembly was. Therefore, a small and high-intensity high-pressure discharge lamp can be manufactured.

  Further, in the second step, a glass partition plate between the portions embedded in the sealing portion of the pair of electrode assemblies in a state where the electrode assembly is inserted into the sealing portion formation scheduled portion. Can be interposed. Thereby, contact between electrode assemblies can be reliably prevented. In addition, the metal foil is not easily crushed at the time of sealing, and can be sealed with a shrink sealing method, which could not be sealed without a pinch seal method in the past, and can be sealed with higher pressure resistance. .

In the second step, in a state where the electrode assembly is inserted into the sealing portion formation scheduled portion, a portion embedded in the sealing portion of at least one of the electrode assemblies is made of a glass tube. Can be accommodated. Thereby, contact between electrode assemblies can be reliably prevented.
In the second step, the outer surfaces of the portions embedded in the sealing portion of the pair of electrode assemblies are respectively covered with glass, and the glass is connected to each other, and then the pair of electrode assemblies Can be inserted into the sealing portion formation scheduled portion. Thereby, contact between electrode assemblies can be reliably prevented. Further, the positioning of the tips of the pair of electrodes is easy.

Hereinafter, a high-pressure discharge lamp, a lamp unit, an image display device, and a method for manufacturing a high-pressure discharge lamp according to the present invention will be described with reference to the drawings.
<About high-pressure discharge lamps>
(1) First Embodiment FIG. 1 is a plan view showing a high-pressure discharge lamp according to the first embodiment, and FIG. 2 is a transverse section of a sealing portion of the high-pressure discharge lamp according to the first embodiment. FIG.

As shown in FIG. 1, the high-pressure discharge lamp according to the first embodiment is a so-called single-ended high-pressure mercury lamp 1 and includes a discharge vessel 2 made of quartz glass and a pair of electrode assemblies 3. .
The discharge vessel 2 includes a main body part 4 and a single sealing part 5 provided continuously at one place of the main body part 4. The main body 4 has a substantially spherical shape with an outer diameter of about 9 mm, and has a discharge space 6 inside. The discharge space 6 is filled with mercury 7 as a luminescent material, a rare gas (not shown) such as argon as a starting aid, and a halogen material (not shown) such as bromine. The sealing portion 5 has a substantially cylindrical shape with an outer diameter D3 of about 5 mm and a length of about 20 mm, and the pair of electrode assemblies 3 are sealed.

Each electrode assembly 3 includes an electrode 8, a metal foil 9, and an external lead wire 10.
Each electrode 8 is made of, for example, tungsten, and has a coil 11 at one end portion (hereinafter referred to as “tip portion”). The pair of electrodes 8 are arranged so that the tip portions thereof are substantially opposed to each other in the discharge space 6. The pair of electrodes 8 is embedded in the sealing portion 5 on the opposite side to the tip portion, and a metal foil 9 is connected to the end portion on the opposite side to the tip portion by welding or the like.

  Each metal foil 9 is made of, for example, molybdenum, and has a strip shape with a width of about 1.5 mm, a length of about 17 mm, and a wall thickness of about 15 μm. An external lead wire 10 made of, for example, a molybdenum wire is connected to the end of each metal foil 9 opposite to the electrode 8 by welding or the like. The entirety of each metal foil 9 and the metal foil 8 side of each external lead wire 10 are respectively embedded in the sealing portion 5. On the other hand, the opposite side of each external lead wire 10 to the metal foil 8 side is led out of the sealing portion 5. In addition, airtightness is ensured by sealing the metal foil 9 in the sealing part 5.

  The pair of metal foils 9 are sealed in the sealing portion 5 in a state in which one main surfaces are substantially opposed to each other. More specifically, the pair of metal foils 9 are arranged such that the distance D1 between the main surfaces facing each other is substantially constant over substantially the entire area between the main surfaces. That is, as shown in FIG. 2, on the cut surface obtained by cutting the metal foil 9 along the short direction of the metal foil 9, the main surfaces 12 of the metal foil 9 that are substantially opposite to each other are arranged so as to be substantially parallel. ing. Further, the pair of metal foils 9 are arranged so that the outlines of the pair of metal foils 9 substantially overlap when the metal foils 9 are viewed from the direction A orthogonal to the main surface. Here, “substantially” in the case where the main surfaces of the metal foil 9 are substantially opposed to each other means that the metal foil 9 is slightly twisted or waved when the metal foil 9 is sealed to the sealing portion 5. It also means that you are hitting.

  A two-dot chain line in FIG. 2 is a glass tube 30 having an inner diameter into which a pair of metal foils 9 can be inserted in the above arrangement, and the inner diameter is about 2 mm, the outer diameter is about 6 mm, and the wall thickness is about 2 mm. The said glass tube 30 is the same type as the glass tube 230 which concerns on the prior art example 1 shown with a dashed-two dotted line in FIG. That is, the high-pressure mercury lamp 1 uses the same glass tube 30 as the glass tube 230 used in the double-ended high-pressure mercury lamp 200, although it is a single-ended high-pressure mercury lamp. Therefore, the outer diameter D3 of the sealing portion 5 of the high-pressure mercury lamp 1 is substantially the same as the outer diameter D4 of the double-end sealing portion 205 shown in FIG.

  In addition, arrangement | positioning of a pair of metal foil 9 is not limited to the said arrangement | positioning, What is necessary is just the state which the main surfaces 12 of a pair of metal foil 9 mutually oppose. FIG. 3 is a cross-sectional view of a sealing portion of a high-pressure discharge lamp according to a modification. For example, as shown in FIG. 3 (a), main surfaces 12a of the metal foil 9a that are substantially opposite to each other are substantially parallel to each other on a cut surface obtained by cutting the metal foil 9a along the short direction of the metal foil 9a. It may be inclined and may be arranged so that angle B may be made. However, in order to reduce the size of the sealing portion 5a, the angle B is preferably 45 ° or less.

Further, as shown in FIG. 3 (b), when the pair of metal foils 9b are viewed from the direction A ′ orthogonal to the main surface, the contours of the pair of metal foils 9b are completely They may be arranged so as not to overlap with each other. In addition, in order to make the sealing part 5b small, it is preferable that deviation | shift is small.
The external lead wire 10 is covered with an electrically insulating coating 13 on the outer surface of the portion led out of the sealing portion 5. As a material of the electrical insulating coating 13, an organic material such as low melting glass, alumina, silica-based ceramic material or resin can be considered. For example, when the electrical insulating coating 13 is made of low melting point glass, the external lead wire 10 and a lamp connector (not shown) are connected, and then the low melting point glass is coated and dried to form on the outer surface of the external lead wire 10. .

  Note that the electrical insulating coating 13 does not necessarily have to be formed so as to cover the entire portion led out of the sealing portion 5 of the external lead wire 10, and it is necessary to ensure electrical insulation. It suffices if it is formed only on the part that does not become. Therefore, the electrical insulating coating 13 is only in the portion where the distance between the pair of external lead wires 10 is close among the portions led out of the sealing portion 5, for example, in the vicinity of the root of the portion led out of the sealing portion 5. In some cases, it is sufficient.

Further, the electrical insulating coating 13 may be formed so as to cover the portion embedded in the sealing portion 5 of the external lead wire 10. With such a configuration, an electrical insulating material 13 can be formed on the external lead wire 10 in advance before sealing the electrode assembly 3 to the sealing portion 5, and the electrical insulating coating 13 can be formed. Can be easily formed.
The electrical insulation of the pair of external lead wires 10 may be ensured by a method other than the formation of the electrical insulation coating 13. For example, electrical insulation can be ensured by setting the shortest distance D2 [mm] between the portions led out of the sealing portion 5 of the external lead wire 10 shown in FIG. 1 to a predetermined distance or more. Here, when the starting pulse voltage of the lighting circuit combined with the high-pressure mercury lamp 1 is V [kV], the shortest distance D2 [mm] is D2 [mm] ≧ 0.4 × V [kV]. It is necessary to satisfy.

(2) Second Embodiment Next, a high-pressure discharge lamp according to a second embodiment will be described. The high pressure discharge lamp according to the second embodiment basically has the same configuration as that of the high pressure discharge lamp according to the first embodiment except that a heat insulating film is formed on the discharge vessel. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The description will focus on the heat insulating film.

FIG. 4 is a plan view showing a high-pressure discharge lamp according to the second embodiment. As shown in FIG. 4, a high-pressure mercury lamp 40 as a high-pressure discharge lamp according to the second embodiment includes a discharge vessel 2 composed of a main body portion 4 and a sealing portion 5, an electrode 8, a metal foil 9, and an external lead wire. And an electrode assembly 3 having 10.
The heat insulating film 41 is formed on the sealing portion 5 side on the outer surface of the main body portion 4 and on the main body portion 4 side on the outer surface of the sealing portion 5. Specifically, the heat insulating film 41 is about 1 mm from the boundary 42 between the main body portion 4 and the sealing portion 5 toward the main body portion 4 side, and about 2 mm from the boundary 42 toward the sealing portion 5 side. The width is formed.

  The heat insulating film 41 may be formed by, for example, applying silicon oxide, titanium oxide, aluminum oxide, graphite, boron nitride or the like to the discharge vessel 2 by suspending it in a solvent, and drying and baking. It is also conceivable to form the heat insulating film 41 by subjecting the outer surface of the discharge vessel 2 to sandblasting or etching. Further, the heat retaining film 41 may be formed as a heat reflecting film made of a heat reflecting material.

  In general, in the discharge vessel 2 of the high-pressure discharge lamp 40, the temperature of the sealing portion 5 that seals the electrode assembly 3 tends to be low. In particular, in the single-ended high-pressure discharge lamp 40, since the two electrode assemblies 3 are sealed in one sealing portion 5, the temperature of the sealing portion 5 tends to be low. For this reason, the temperature of the portion close to the sealing portion 5 of the main body portion 4 is likely to be low, and the coldest point is likely to be generated in the portion close to the sealing portion 5.

On the other hand, the high pressure mercury lamp 40 has the heat retaining film 41 formed in a portion where the coldest spot is likely to be generated, so that the temperature of the coldest spot can be raised. Thereby, the fall of vapor pressure, such as the mercury 7 enclosed in the discharge space 6, can be suppressed, and the improvement of the luminous efficiency and the color rendering property of the high pressure mercury lamp 40 can be aimed at.
Note that the position and range for forming the heat insulating film 41 and the method for forming the protective film 41 are not limited to the above, and can be appropriately changed according to the size and application of the high-pressure mercury lamp 40. However, it is effective to form at least the sealing portion side of the main body portion where the coldest spot is likely to occur.

(3) Third Embodiment Next, a high-pressure discharge lamp according to a third embodiment will be described. The high pressure discharge lamp according to the third embodiment basically has the same configuration as that of the high pressure discharge lamp according to the first embodiment except that the shape of the electrodes is different. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The description will focus on the shape of the electrodes.

  FIG. 5 is an enlarged view showing the vicinity of the tip of the electrode of the high-pressure discharge lamp according to the third embodiment. As shown in FIG. 5, the pair of electrodes 50 a and 50 b of the high-pressure discharge lamp according to the third embodiment is between the base portions 51 a and 51 b and the tip portions 52 a and 52 b of the portion protruding into the discharge space 6. , Each has a proximity portion (a portion indicated by shading in the drawing) 53a, 53b whose distance is reduced. A distance L1 between the proximity portions 53a and 53b of the pair of electrodes 50a and 50b is shorter than a distance L2 between the root portions 51a and 51b and longer than a distance L3 between the tip portions 52a and 52b.

  The shape of the pair of electrodes 50a and 50b will be described in detail. The portions of the pair of electrodes 50a and 50b that protrude into the discharge space 6 are reduced in two steps. The pair of electrodes 50a and 50b first extend toward the center of the discharge space 6 while maintaining the distance L2 between the pair of base portions 51a and 51b, and the distance between the pair of adjacent portions 53a and 53b is set to the distance L1. Further, it is formed so as to reach the center of the discharge space 6 while keeping the distance at the distance L1, and the distance between the pair of tip portions 52a, 52b is the distance L3. A discharge path is formed between the tip portions 52a and 52b of the electrodes 50a and 50b in a direction substantially orthogonal to the longitudinal direction of the electrode assembly 3.

  A distance L1 between the proximity portions 53a and 53b is about 2 mm, and is a distance at which discharge occurs when the lamp is started. In the high-pressure discharge lamp according to the third embodiment, discharge can occur not only between the tip portions 52a and 52b but also between the adjacent portions 53a and 53b when starting the lamp. Thus, since the area | region which can generate discharge is wide, discharge tends to occur at the time of lamp start, and lamp start is easy. The discharge generated between the proximity portions 53a and 53b moves between the tip portions 52a and 52b having a shorter discharge distance.

  The distance L3 between the tips 52a and 52b of the electrodes 50a and 50b is preferably 0.5 mm to 3.0 mm in order to bring the lamp closer to the point light source. In addition, the distance L2 between the root portions 51a and 51b is preferably 3 mm to 4 mm in order to suppress root discharge that occurs between the root portions 51a and 51b. Therefore, the distance L1 between the proximity portions 53a and 53b is preferably designed to be 2 mm or more and 3 mm or less which is shorter than L2 and longer than L3.

The proximity portions 53a and 53b are formed by bending a portion of the electrodes 50a and 50b protruding into the discharge space 51. The electrodes 50a and 50b having the proximity portions 53a and 53b can be formed by a method such as welding, punching, or integral molding.
The shape of the electrode of the high-pressure discharge lamp according to the third embodiment is not limited to the above shape, and the pair of electrodes each have a proximity portion, and the distance L1 between the proximity portions is the distance L2 between the root portions. Shorter than the distance L3 between the tip portions. Therefore, for example, a high-pressure mercury lamp provided with an electrode having a shape as shown in FIG.

  FIG. 6 is an enlarged view showing the vicinity of the tip of the electrode of the high-pressure discharge lamp according to the third embodiment. The pair of electrodes 60 a and 60 b shown in FIG. 6 are different from each other in the shape of the portion protruding into the discharge space 6. Specifically, first, the gap extends from the pair of root portions 61a and 61b toward the center of the discharge space 6 while keeping the distance L2, and one of the adjacent portions (the portions indicated by shading in the drawing) 63a and 63b When the electrode 60a approaches the other electrode 60b, the distance between them is reduced to the distance L1, and one electrode 60a extends toward the center of the discharge space 6, and the other electrode 60b is opposite to the one electrode 60a by detour. It is formed so that it approaches the center from the side, and the distance between the pair of tip portions 62a, 62b is the distance L3 at the center. A discharge path is formed between the tip portions 62a and 62b of the electrodes 60a and 60b in a direction substantially parallel to the longitudinal direction of the electrode assembly 3.

(4) Fourth Embodiment Next, a high pressure discharge lamp according to a fourth embodiment will be described. The high-pressure discharge lamp according to the fourth embodiment is basically the same as the high-pressure discharge lamp according to the first embodiment except that a mercury retaining member is provided at the base of the portion protruding into the discharge space of the electrode. It has the same configuration. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted, and description will be made focusing on the mercury retaining member.

  FIG. 7 is a plan view showing a high-pressure discharge lamp according to the fourth embodiment. As shown in FIG. 7, the high-pressure discharge lamp 70 according to the fourth embodiment is provided with a coil 71 as an example of a mercury retaining member at the root of the portion of the electrode 8 protruding into the discharge space 6. The coil 71 is wound about 0.5 mm between the sealing portion 5 by winding a wire made of tungsten directly around the electrode 8 or by welding the wire to the electrode 8 after forming the wire into a coil shape. Is provided at a position where there is a gap.

  The electrode assembly 3 is made of a material having good thermal conductivity, and has one end connected to the outside, and thus has good heat dissipation. Therefore, in the discharge space 6 after the lamp is extinguished, the temperature of the base portion of the electrode 8 tends to be the lowest, and mercury tends to collect at the base portion. By providing the coil 71 at such a root portion where mercury easily collects, mercury that collects in the vicinity of the root can be retained in the coil 71. Thereby, when the temperature of the base part of the electrode 8 rises by the base discharge at the time of starting the lamp lighting, the mercury retained at the base part can be vaporized at an early stage.

The mercury retention member is not limited to the coil 71, and may be a member combined with a plurality of rings, or a bottomed or bottomless cylindrical member, and these may be attached to the electrode by welding or caulking. It is conceivable to provide it.
As described above, the high-pressure discharge lamp according to the present invention has been specifically described based on the embodiment, but the high-pressure discharge lamp according to the present invention is not limited to the above configuration.

<About the lamp unit>
FIG. 8 is a cross-sectional view showing the lamp unit according to the embodiment. As shown in FIG. 8, a lamp unit 80 according to the present embodiment includes a high-pressure mercury lamp 1 according to the first embodiment and a reflecting mirror 82 having a reflecting surface 81 that reflects the light emitted from the high-pressure discharge lamp 1. With. The high-pressure discharge lamp used in the lamp unit according to the present invention is not limited to the high-pressure mercury lamp 1 according to the first embodiment, and is the high-pressure mercury lamp according to the second to fourth embodiments. good.

  The reflecting mirror 82 is, for example, a funnel-shaped dichroic reflecting mirror, and a lamp mounting hole 83 for inserting the sealing portion 5 of the high-pressure mercury lamp 1 is formed on the side having a small opening diameter, that is, substantially at the center of the reflecting surface 81. Has been. The high-pressure mercury lamp 1 is fixed to the reflecting mirror 82 with cement 84 after the sealing portion 5 is inserted into the lamp mounting hole 83 and positioned so that the tip of the pair of electrodes 8 is disposed at a predetermined position.

The high-pressure mercury lamp 1 is ideally positioned with respect to the first focal point on the design of the reflector and the optical center (point located at the center between the tip portions of the pair of electrodes 8) P1 on the design of the high-pressure mercury lamp 1 It is ideal that the two substantially match. Actually, the high-pressure mercury lamp 1 is slid left, right, up, down, and front and back toward the paper surface of FIG. 8 and positioned at a position where the illuminance in front of the reflecting mirror 82 becomes maximum.
By the way, in the high pressure mercury lamp 300 of the conventional example 2 as shown in FIG. 17, the emitted light emitted from the optical center P3 is not condensed with high accuracy on the second focal point P4 of the reflecting mirror 310. That is, since the high pressure mercury lamp 300 of the conventional example 2 has to use the large diameter glass tube 330 for producing the discharge vessel 303 as described above, in order to shorten the width of the high pressure mercury lamp 300 in the light emission direction. In this case, the main body 301 must be formed in an oval shape. As described above, when the main body 301 is elliptical, a part of the light emitted from the optical center P3 is focused on, for example, P5 without being irradiated on the position where the reflecting surface 311 is planned.

  On the other hand, since the high-pressure mercury lamp 1 can use a small-diameter glass tube 30 for producing the discharge vessel 2, the main body 2 can be removed even if the width of the high-pressure mercury lamp 1 is shortened. It can be formed into a substantially spherical shape. The lamp unit 80 including the high-pressure mercury lamp 1 having the substantially spherical body 2 as described above reflects the emitted light emitted from the optical center P1 by the reflecting surface 81, and the second focal point P2 of the reflecting mirror 82. Can be condensed with high accuracy.

The reflecting surface 81 of the reflecting mirror 82 is not limited to a curved surface that reflects the outgoing light from the high-pressure mercury lamp 1 and collects it at a single point, but has a curved surface that reflects the outgoing light to become parallel light. It may be.
Since the lamp unit 80 includes the high-pressure mercury lamp 1 according to the first embodiment, the overall length W1 of the lamp unit, that is, the dimension in the light emission direction (direction connecting P1 and P2) is shown in FIG. This is equivalent to the total length W3 of the high-pressure mercury lamp 300 of Example 2. Moreover, since the sealing portion 5 of the high-pressure mercury lamp 1 according to the first embodiment has a smaller outer diameter D3 than the sealing portion 305 of the high-pressure mercury lamp 300 of Conventional Example 2, the lamp mounting hole 83 of the reflecting mirror 82 is used. Is smaller, and thus the reflecting surface 81 is wider, so that the brightness is higher than that of the high pressure mercury lamp 300 of the conventional example 2.

Although the lamp unit according to the present invention has been specifically described above based on the embodiment, the lamp unit according to the present invention is not limited to the above configuration.
<Image display device>
(1) First Embodiment FIG. 9 is a partially broken perspective view showing an image display device according to a first embodiment. As shown in FIG. 9, a front projector 90 as an example of an image display device according to the first embodiment is a projection type image display device that projects an image toward a screen (not shown) installed in front. FIG. 9 shows the front projector 90 with the top plate of the housing 91 removed.

  The front projector 90 is a projector that adopts the DLP (registered trademark) system, and includes a lamp unit 80 having a high-pressure mercury lamp 1 as a light source in a casing 91, DMD (registered trademark), and three color filters. An optical unit 92 having a color wheel (not shown), a control unit 93 for driving and controlling the DMD, a projection lens 94, a cooling fan unit 95, and power supplied from a commercial power source The power supply unit 96 and the like that are converted into power suitable for the lamp unit 80 and supplied are stored.

  When the front projector 90 is installed on a horizontal plane, the high-pressure mercury lamp 1 is attached so that the pair of electrodes 8 are arranged horizontally and the light emission direction C of the high-pressure mercury lamp 1 is oriented in the horizontal direction. Further, the front projector 90 is designed so that the light emitting direction D of the front projector 90 is oriented in the horizontal direction when the front projector 90 is installed on a horizontal plane.

(2) Second Embodiment FIG. 10 is a perspective view showing an image display apparatus according to a second embodiment. As shown in FIG. 10, a rear projector 100 as another example of the image display apparatus according to the second embodiment is a projection type image display apparatus.
The rear projector 100 has a configuration in which a lamp unit 80 as a light source, an optical unit, a projection lens, a mirror (all not shown) and the like are housed in a housing 101, and is projected from the projection lens and the mirror. The image reflected at is projected from the back side of the transmissive screen 102 and displayed as an image.

The image display device according to the present invention has been specifically described above based on the embodiments, but the image display device according to the present invention is not limited to the above configuration.
<Method for manufacturing high-pressure discharge lamp>
(1) 1st Embodiment Next, the manufacturing method which concerns on 1st Embodiment is demonstrated. The manufacturing method according to the first embodiment includes a glass tube forming step as a first step, an electrode assembly insertion step as a second step, and a sealing step as a third step.

  FIG. 11 is a process diagram for explaining a first process of the manufacturing method of the high-pressure discharge lamp. In the glass tube forming step as the first step, a glass tube 119 as shown in FIG. 11 (a) is replaced with a body portion formation scheduled portion 111 which becomes the main body portion 4 of the discharge vessel 2 as shown in FIG. 11 (c). And a glass tube 110 having a sealing portion formation scheduled portion 112 that becomes the sealing portion 5 of the discharge vessel 2.

  First, as shown in FIG. 11A, while rotating the glass tube 119 around its tube axis, the portion that becomes the body portion formation scheduled portion 111 is heated from the outer periphery by the burner 113 and softened. Next, as shown in FIG. 11 (b), a die 115a having an upper die and a lower die and having cavity portions 114a and 114b having the same shape as the outer peripheral shape of the body portion formation scheduled portion 111 in a closed state. 115b sandwich the softened portion. And as shown in FIG.11 (c), the compressed gas of an inert gas is blown in from an open end part, the said softening part is expanded, and the outer periphery of the part used as the main-body-part formation scheduled part 111 is cavity part 114a, 114b. The main body portion formation scheduled portion 111 is formed by being along the inner surface of the main body portion. Thereafter, both ends are cut at appropriate positions to complete the glass tube 110 having the main body portion formation planned portion 111 and the sealing portion formation planned portion 112. The glass tube 110 has a planned cutting portion 116 on the opposite side of the main tube portion forming planned portion 111 from the sealing portion forming planned portion 112 side.

FIG. 12 is a process diagram for explaining a second process of the method for manufacturing the high-pressure discharge lamp. In the electrode assembly insertion step as the second step, the pair of electrode assemblies 3 are inserted into the sealing portion formation scheduled portion 112 so that the main surfaces of the pair of metal foils 9 are substantially opposed to each other. .
First, as shown to Fig.12 (a), the glass partition plate 117 is inserted in the sealing part formation scheduled part 112 of the glass tube 110 obtained at the glass tube formation process. Next, as shown in FIG. 12B, the pair of electrode assemblies 3 are inserted into the sealing portion formation scheduled portion 112 so that the pair of electrode assemblies 3 are positioned on both sides of the partition plate 117, respectively. To do. At this time, the portion of the pair of electrode assemblies 3 embedded in the sealing portion 5, that is, between the pair of electrodes 8 on the metal foil 9 side, between the pair of metal foils 9, and the metal of the pair of external lead wires 10. The pair of electrode assemblies 3 are arranged so that the partition plate 117 is interposed between the foil 9 sides. In addition, the pair of electrode assemblies 3 is arranged so that the distal ends of the pair of electrodes 8 are located at the approximate center in the body portion formation scheduled portion 111.

FIG. 13 is a process diagram for explaining a third process in the method for manufacturing a high-pressure discharge lamp. In the sealing step as the third step, the electrode assembly 3 is sealed by heating and shrinking the sealing portion formation scheduled portion 112.
When the sealing portion formation scheduled portion 112 is heated and softened by, for example, the burner 118, the softened portion contracts, and a part of the inner surface of the sealing portion formation scheduled portion 112 and the electrode assembly 3 are brought into close contact with each other. The electrode assembly 3 is sealed. At the time of sealing, the partition plate 117 is integrated with the sealing portion formation scheduled portion 112. Since the partition plate 117 is interposed, the pair of electrode assemblies 3 are sealed without contacting each other.

After the sealing process is completed, mercury 7, a rare gas, and a halogen substance (all not shown) are introduced into the body portion formation planned portion 111 from the side of the cut portion 116 of the glass tube 110, and the cut portion 116 is removed. The main body part formation scheduled part 111 is hermetically sealed. Finally, the unnecessary excision scheduled portion 116 is excised.
(2) Second Embodiment Next, a method for manufacturing a high-pressure discharge lamp according to a second embodiment will be described. The manufacturing method of the high-pressure discharge lamp according to the second embodiment basically has the same configuration as the manufacturing method according to the first embodiment except for the second step. Therefore, only the second step will be described.

FIG. 14 is a process diagram for explaining a second process of the manufacturing method of the high-pressure discharge lamp according to the second embodiment. As shown in FIG. 14, in the second step according to the second embodiment, in a state where the electrode assembly 3 is inserted into the sealing portion formation scheduled portion 112, the sealing portion 5 of one of the electrode assemblies 3. The portion embedded in the glass is accommodated in a glass tube 120.
That is, first, as shown in FIG. 14A, one electrode assembly 3 is inserted into the tube body 120, and the metal foil 9 side of the electrode 8, the entire metal foil 9 and the metal foil 9 side of the external lead wire 10 are It is set as the state accommodated in the tubular body 120. FIG. Next, as shown in FIG. 14B, the tube body 120 and the electrode assembly 3 are inserted into the sealing portion planned portion 112 while maintaining the state. The glass tube 120 is integrated with the sealing portion formation scheduled portion 112 in the sealing step.

The glass tube 120 is inserted into the sealing portion formation scheduled portion 112 first, and the electrode assembly 3 is inserted into the tube 120 after being inserted into the sealing portion formation planned portion 112. good. Moreover, the structure which accommodates both of a pair of electrode assembly 3 in the each separate pipe 120 may be sufficient.
Thus, by accommodating the part sealed by the sealing part 5 of one electrode assembly 3 in the tubular body 120, contact between the electrode assemblies 3 can be prevented.

(3) Third Embodiment Next, a method for manufacturing a high-pressure discharge lamp according to a third embodiment will be described. The manufacturing method of the high-pressure discharge lamp according to the third embodiment basically has the same configuration as the manufacturing method according to the first embodiment except for the second step. Therefore, only the second step will be described.
FIG. 15 is a process diagram for explaining a second process of the method for manufacturing a high-pressure discharge lamp according to the third embodiment. As shown in FIG. 15, in the second step according to the third embodiment, the outer surfaces of the portions embedded in the sealing portion 5 of the pair of electrode assemblies 3 are respectively covered with glass 130, and the glass After connecting 130 together, the pair of electrode assemblies 3 is inserted into the sealing portion formation scheduled portion 112.

  Specifically, first, the pair of electrode assemblies 3 are inserted into separate glass tubes (not shown), and the tubes are heated and softened with a burner, as shown in FIG. The outer surface of each electrode assembly 3 is covered with glass 130. Each electrode assembly 3 has a portion embedded in the sealing portion 5, that is, a state in which the metal foil 9 side of the electrode 8, the entire metal foil 9, and the metal foil 9 side of the external lead wire 10 are covered with at least glass 130. .

Next, as shown in FIG. 15B, the glass 130 is connected by welding or the like via a glass block 131 or the like. At that time, alignment is performed so that the tip portions of the electrodes 8 face each other. The pair of electrode assemblies 3 obtained in this way is inserted into the sealing portion planned portion 112. Note that the glasses 130 may be directly connected to each other.
Since each electrode assembly 3 is covered with the glass body 130, it does not contact each other. Further, since the tip portions of the electrode assemblies 3 can be aligned before inserting the pair of electrode assemblies 3 into the sealing portion formation scheduled portion 112, the tip portions are opposed to each other with high accuracy. be able to.

  As mentioned above, although the manufacturing method of the high pressure discharge lamp which concerns on this invention has been concretely demonstrated based on embodiment, the manufacturing method of the high pressure discharge lamp which concerns on this invention is not limited to said embodiment.

  The high-pressure discharge lamp can be applied to general high-pressure discharge lamps such as a high-pressure mercury lamp and a metal halide lamp.

It is a top view which shows the high pressure discharge lamp which concerns on 1st Embodiment. It is a cross-sectional view of the sealing part of the high pressure discharge lamp which concerns on 1st Embodiment. It is a cross-sectional view of the sealing part of the high pressure discharge lamp which concerns on a modification. It is a top view which shows the high pressure discharge lamp which concerns on 2nd Embodiment. It is an enlarged view which shows the front-end | tip part vicinity of the electrode of the high pressure discharge lamp which concerns on 3rd Embodiment. It is an enlarged view which shows the front-end | tip part vicinity of the electrode of the high pressure discharge lamp which concerns on 3rd Embodiment. It is a top view which shows the high pressure discharge lamp which concerns on 4th Embodiment. It is sectional drawing which shows a lamp unit. 1 is a partially broken perspective view showing an image display device according to a first embodiment. It is a perspective view which shows the image display apparatus which concerns on 2nd Embodiment. It is process drawing for demonstrating the 1st process of the manufacturing method of the high pressure discharge lamp which concerns on 1st Embodiment. It is process drawing for demonstrating the 2nd process of the manufacturing method of the high pressure discharge lamp which concerns on 1st Embodiment. It is process drawing for demonstrating the 3rd process of the manufacturing method of the high pressure discharge lamp which concerns on 1st Embodiment. It is process drawing for demonstrating the 2nd process of the manufacturing method of the high pressure discharge lamp which concerns on 2nd Embodiment. It is process drawing for demonstrating the 2nd process of the manufacturing method of the high pressure discharge lamp which concerns on 3rd Embodiment. It is sectional drawing which shows the lamp unit provided with the high pressure discharge lamp which concerns on the prior art example 1. FIG. It is sectional drawing which shows the lamp unit provided with the high-pressure discharge lamp concerning the prior art example 2. It is sectional drawing of the sealing part of the high pressure discharge lamp which concerns on the prior art example 1. FIG. It is sectional drawing of the sealing part of the high pressure discharge lamp which concerns on the prior art example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High pressure discharge lamp 2 Discharge vessel 3 Electrode assembly 4 Main body part 5 Sealing part 6 Discharge space 8 Electrode 9 Metal foil 10 External lead wire 12 Main surface 13 Electrical insulation film 41 Heat insulation film 53a, 53b, 63a, 63b Proximity part DESCRIPTION OF SYMBOLS 80 Lamp unit 81 Reflecting surface 82 Reflecting mirror 90,100 Image display apparatus 110 Glass tube 111 Main body part formation scheduled part 112 Sealing part formation scheduled part 117 Partition plate 120 Tube 130 Glass

Claims (12)

A discharge vessel comprising a main body portion having a discharge space therein, and a sealing portion continuously provided at one place of the main body portion;
A pair of electrodes in which one end is disposed in the discharge space and the other end is sealed in the sealing portion;
A pair of metal foils connected to the other ends of the electrodes and sealed in the sealing portion in a state where the main surfaces are substantially opposed to each other;
A pair of external lead wires each connected to the metal foil and having one end portion led out of the sealing portion;
A high-pressure discharge lamp comprising:   2. The high-pressure discharge lamp according to claim 1, wherein a distance D <b> 1 between opposing main surfaces of the pair of metal foils is substantially constant over substantially the entire region between the main surfaces.   The high pressure discharge lamp according to claim 1, wherein a heat insulating film is formed on the outer surface of the main body on the sealing portion side.   Each of the pair of electrodes has a proximity portion whose distance is reduced between a root portion and the one end portion of the portion protruding into the discharge space, and a distance L1 between the proximity portions is The high pressure discharge lamp according to any one of claims 1 to 3, wherein the high pressure discharge lamp is shorter than a distance L2 between the root portions and longer than a distance L3 between the one end portions.   5. The pair of external lead wires according to claim 1, wherein at least a sealing portion side of a portion led out of the sealing portion is covered with an electrical insulating film. High pressure discharge lamp.   When the shortest distance between the portions of the pair of external lead wires led out of the sealing portion is D2 [mm] and the starting pulse voltage of the combined lighting circuit is V [kV], D2 [mm] ≧ 5. The high-pressure discharge lamp according to claim 1, wherein the relationship of 0.4 × V [kV] is satisfied.   A lamp unit comprising: the high-pressure discharge lamp according to any one of claims 1 to 6; and a reflecting mirror having a reflecting surface that reflects light emitted from the high-pressure discharge lamp.   An image display device comprising the high-pressure discharge lamp according to claim 1. A main body having a discharge space therein, and a discharge container comprising a sealing portion continuously provided at one place of the main body;
A pair of electrodes having one end disposed in the discharge space, a pair of metal foils connected to the other end of the electrode, and a pair of externals connected to the pair of metal foils, respectively A pair of electrode assemblies consisting of lead wires and sealed in the sealing portion;
A method of manufacturing a high-pressure discharge lamp comprising:
A first step of preparing a glass tube having a main body portion formation scheduled portion to be the main body portion and a sealing portion formation scheduled portion to be the sealing portion;
A second step of inserting the pair of electrode assemblies into the sealing portion formation scheduled portion so that the principal surfaces of the pair of metal foils are substantially opposed to each other;
And a third step of sealing the electrode assembly by heating / shrinking the sealing portion formation scheduled portion.   In the second step, a glass partition plate is interposed between portions embedded in the sealing portion of the pair of electrode assemblies in a state where the electrode assembly is inserted into the sealing portion formation scheduled portion. The method of manufacturing a high-pressure discharge lamp according to claim 9.   In the second step, a portion embedded in the sealing portion of at least one of the electrode assemblies is accommodated in a glass tube in a state where the electrode assembly is inserted into the sealing portion formation scheduled portion. The method of manufacturing a high-pressure discharge lamp according to claim 9.   In the second step, the outer surfaces of the portions embedded in the sealing portion of the pair of electrode assemblies are respectively coated with glass, and the glass is connected to each other, and then the pair of electrode assemblies is The method for manufacturing a high-pressure discharge lamp according to claim 9, wherein the high-pressure discharge lamp is inserted into a sealing portion formation scheduled portion.

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