JP3481612B2 - Discharge lamp and lamp device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp having a pair of discharge electrodes facing each other inside an arc tube and containing mercury and a rare gas, and such a discharge lamp is provided inside a reflecting mirror. The present invention relates to a built-in lamp device. This lamp device is used, for example, as a light source for a video projector.

[0002]

2. Description of the Related Art Conventionally, as a light source for a video projector, for example, a lamp device having a concave reflecting mirror provided with a discharge lamp such as a high-pressure mercury vapor discharge lamp has been used. The discharge lamp is provided with a pair of discharge electrodes facing each other inside the arc tube, and the discharge electrode is formed by enclosing mercury and rare gas, etc., in order to keep the inside of the arc tube airtight. The electric power is supplied through the wiring members that are enclosed in the sealing portions provided on both sides of the and are connected by welding or the like. Further, the distance between the discharge electrodes is set to be relatively short, and by forming an arc having a short arc length (short arc), the projection light can be efficiently supplied to a predetermined optical system to project a bright image on the screen. It is like this.

The discharge lamp as described above is characterized in that the arc tube becomes extremely hot during the lighting operation. Specifically, for example, in a general short arc high-pressure mercury vapor discharge lamp with a lamp power of 100 to 150 W, the maximum temperature of the arc tube (inner wall of the upper part of the arc tube) is about 900 to 1,000 ° C. Become. Also, the temperature of the sealing part is 5
It is about 00 ° C, that is, lower than the above-mentioned maximum temperature, but still becomes a considerably high temperature. Therefore, the wiring member arranged in the sealing portion is made of a refractory metal such as molybdenum. However, if the temperature of the sealing portion rises too much, oxidative corrosion of the welded portion of the wiring member in the sealing portion or in the vicinity of the sealing portion may lead to disconnection and the lamp may not light up. . Therefore, in a normal projector, a cooling fan is provided in the main body to suppress an excessive temperature rise of the discharge lamp and the reflecting mirror. In order to prevent disconnection due to oxidation or the like of the welded portion of the wiring member as described above, the temperature of the welded portion is regulated by, for example, “IEC (International Electrotechnical Commission) 60357 T” which is a regulation for halogen lamps.
ungsten halogen lamps "and" J
It is considered that the temperature (350 ° C.) described in “IS (Japanese Industrial Standard) C 7527 halogen bulb” is set as a standard, and it is preferable to suppress the temperature to 400 ° C. or less at the highest.

The discharge lamp is also characterized in that the pressure inside the arc tube becomes extremely high during the lighting operation. Specifically, for example, as described above, the lamp power is 10
In a general discharge lamp of 0 to 150 W class, the pressure inside the arc tube (operating pressure) reaches nearly 200 atm. For this reason, if the arc tube is damaged when the lamp is turned on, there is a tendency for a loud popping sound or glass fragments to scatter. The occurrence of such a popping sound and the scattering of glass pieces becomes a factor of reducing the commercial value, especially when applied to a home projector. Therefore,
A lamp device is often used in which the opening of the reflecting mirror is closed by a front glass to reduce the popping noise and the scattering of glass fragments. Here, if a completely enclosed space is formed between the reflecting mirror and the front glass, the temperature rise of the discharge lamp becomes remarkable. On the other hand, if a reflection mirror or a front glass is provided with a cutout or the like to cool the discharge lamp and the outside air is circulated inside, the burst sound when the arc tube is broken is significantly reduced, or glass fragments are scattered or scattered. It is difficult to reliably prevent the emission of mercury vapor that is dispersed.

Further, in recent years, there has been an increasing demand for higher brightness of projected images and miniaturization of projectors. However, it has been difficult to increase the lamp power and reduce the size of the reflecting mirror due to these requirements, because the temperature of the discharge lamp is further increased. Therefore, in order to fully meet the demand for higher brightness of projected images and smaller projectors, the temperature rise of the lamp device accompanying the increase in output and the miniaturization of the reflector, especially the temperature at the welded part of the wiring member. Effective suppression of the rise was sought.

[0006]

In view of the above points, the present invention can prevent disconnection due to oxidation or the like of a welded portion of a wiring member even when the lamp power is increased or the reflector is downsized. An object of the present invention is to provide a high-pressure vapor discharge lamp and a lamp device capable of extending the life of the lamp and reducing the defective rate. In addition, an object of the present invention is to provide a lamp device capable of reducing the burst noise of the arc tube and reliably preventing the scattering of glass fragments and the emission of mercury vapor.

[0007]

DISCLOSURE OF THE INVENTION The present invention for solving the above problems extends from a light emitting tube in which a pair of electrodes are arranged opposite to each other in a tube in which a light emitting substance is enclosed, and the light emitting tube ( That is, a discharge lamp having a pair of sealing parts (which are connected to the arc tube), a reflecting mirror for reflecting the light emitted from the discharge lamp, and a space between the reflecting mirror and the opening part of the reflecting mirror. The lamp device is provided with a transparent member for accommodating the discharge lamp, and an excessive temperature rise suppressing means for suppressing a temperature rise of a welding portion of a wiring member electrically connected to an electrode of the discharge lamp.

That is, according to the present invention, in the lamp device in which the discharge lamp is housed in the space formed of the reflecting mirror and the transparent member covering the reflecting mirror, the wiring members and their welding points due to the heat generated by the light emission of the lamp are provided. A means for suppressing the temperature rise of is provided. This makes it possible to suppress thermal deterioration of the welded portion of the wiring member, prevent disconnection at that portion, and prolong the life of the lamp and reduce the defective rate. Further, it becomes possible to easily cope with the increase in the lamp power and the miniaturization of the reflecting mirror which are required.

In the present invention, the discharge lamp preferably has a foil sealing structure. INDUSTRIAL APPLICABILITY The present invention is useful for a widely used discharge lamp having a so-called foil sealing structure. In a discharge lamp with a foil-sealed structure, the space between which the electrodes, etc. are arranged is maintained in close contact with the glass forming the sealed part, regardless of damage due to thermal shock and the difference in coefficient of thermal expansion between the two. A metal foil capable of ensuring a large contact area is used as a wiring member in the sealing portion so that the airtightness is maintained. One end of the metal foil is connected to the conductive member connected to the external power source by welding at the end of the sealing portion. By providing the excessive temperature rise suppressing means, it is possible to suppress an excessive temperature rise at the welded portion between the metal foil and the wiring member in the sealing portion where the temperature becomes high. Further, it is possible to suppress the temperature rise even at the welding portion of the wiring member located outside the sealing portion and in the vicinity thereof.

Of course, a lamp device using a discharge lamp having no foil sealing structure, such as a discharge lamp in which a rod-shaped wiring member is sealed in a sealing portion or a discharge lamp in which electrodes penetrate the sealing portion. Also in this case, it is possible to prevent disconnection at a welding portion between these and other wiring members.

In the present invention, it is preferable that the insides of the reflecting mirror and the transparent member that house the discharge lamp are hermetically sealed. Thereby, when the arc tube is damaged, it is possible to significantly reduce the burst noise, and it is possible to reliably prevent the scattering of the glass pieces and the emission of the mercury vapor that is scattered.

According to the present invention, the pair of sealing portions have different lengths from each other, and the excessive temperature rise suppressing means has the longer sealing portion on the transparent member side and the shorter sealing portion on the bottom side of the reflecting mirror. It is preferable to dispose a stop. More specifically, it is preferable that the end portion of the sealing portion arranged on the transparent member side is set so as to be located near the transparent member.

In the lamp device, since the sealing portion on the transparent member side has a higher temperature than the sealing portion on the bottom side of the reflecting mirror, the welding location of the wiring member on the sealing portion on the transparent member side is Deterioration due to heat is more likely to occur than at the welded portion of the wiring member in the other sealing portion. Further, in the discharge lamp having a foil-sealed structure, the welding location of the metal foil and the conductive member on the side connected to the external power supply is more than the welding location of the metal foil and the discharge electrode, which become higher in temperature. Since the airtightness is low, deterioration due to heat easily occurs. Therefore, by setting the length of the sealing portion as described above, the distance from the tip of the sealing portion on the transparent member side to the light emitting portion becomes longer than that on the other side. It is possible to suppress the temperature of the tip of the portion to a low level and prevent disconnection due to oxidation or the like at the tip of the sealing portion on the transparent member side or at the welded portion of the wiring member located in the vicinity thereof.

In the present invention, it is preferable that the excessive temperature rise suppressing means is a heat conducting means for conducting the heat of the sealing portion arranged on the transparent member side to the outside of the lamp device. As the heat conducting means, for example, a copper plate or a heat pipe having one end wound around the sealing portion and the other end extended to the outside of the lamp device can be used. Since the heat of the sealing portion is radiated to the outside of the lamp device through such a heat conducting means, the temperature of the tip portion of the sealing portion can be kept low and the welding portion of the wiring member can be oxidized. It is possible to prevent disconnection due to the like.

In the present invention, it is preferable that the excessive temperature rise suppressing means is such that the sealing portion arranged on the transparent member side is integrated with the transparent member. As a result, the heat of the tip of the sealing portion is radiated from the outer surface of the transparent sealing member, so that the temperature of the tip of the sealing portion can be kept low, and the welding portion of the wiring member can be oxidized. It is possible to prevent disconnection due to.

In the present invention, it is preferable that the excessive temperature rise suppressing means has a tip portion of the sealing portion arranged on the transparent member side protruding outside the transparent member. As a result, the tip portion of the sealing portion is cooled by the outside air, so that the temperature of the tip portion of the sealing portion can be kept low, and disconnection due to oxidation of the welded portion of the wiring member can be prevented. it can.

The present invention preferably further comprises cooling means for radiating or absorbing heat conducted to the outside of the lamp device. As the cooling means, for example, a cooling fan,
A radiation fin, a Peltier element cooling module, etc. can be used. As a result, the heat conducted by the heat-conducting means, the heat conducted to the surface or the peripheral portion of the transparent sealing member, or the heat at the tip of the protruding sealing portion can be efficiently dissipated. The temperature of the part can be easily kept low.

The present invention comprises a light emitting tube in which a pair of electrodes are arranged so as to face each other in a tube in which a light emitting substance is sealed, and a pair of sealing portions extending from the light emitting tube. , High pressure vapor discharge lamps having different lengths. By using such a high-pressure vapor discharge lamp, it is possible to configure a lamp device that can suppress the temperature of the tip of the sealing portion to a low level and prevent disconnection due to oxidation or the like of the welded portion of the wiring member.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION As a preferred embodiment of the present invention, an example of a lamp device using a high pressure mercury vapor discharge lamp will be described in detail below with reference to the drawings.

<First Embodiment> A high-pressure mercury vapor discharge lamp in which the length of a sealing portion is formed asymmetrically, and a lamp device using the discharge lamp will be described. As shown in FIG. 1, the lamp device 10 includes, for example, an elliptical reflecting surface 1
1a and has a reflecting mirror 11 having an opening diameter of 80 mm. A discharge lamp 21 having a lamp power (rated power) of 200 W is arranged inside the reflecting mirror 11. The opening of the reflecting mirror 11 is sealed by the front glass 12,
Even if the discharge lamp 21 is damaged, a loud popping noise,
It is designed to prevent the scattering of glass fragments and the release of mercury vapor.

The discharge lamp 21 has a pair of sealing portions 23 and 24 connected to both ends of the arc tube 22, respectively. The sealing portions 23 and 24 have different lengths, and the sealing portion 23 on the front glass 12 side is longer than the other sealing portion 24. Further, the tip of the sealing portion 23 is set to be located near the front glass 12. Inside the arc tube 22, a pair of coil-shaped or rod-shaped discharge electrodes 25 made of, for example, tungsten are provided, and mercury 26 and a luminescent substance such as a rare gas (not shown) are enclosed. The discharge lamp 21 is not limited to the high-pressure mercury vapor discharge lamp as described above, but may be one in which a halogen gas, a metal halide, or the like is further enclosed as a filling substance, or one containing no mercury.

The sealing portions 23 and 24 are respectively provided in the electrode 2
5, metal foils 27 and 28 made of a high melting point metal such as molybdenum and the like, and a glass tube extended from the arc tube 22, and foil sealing between the metal foils 27 and 28 and the glass tube. The airtightness of the discharge space of the arc tube 22 is maintained by. The pair of discharge electrodes 25 are welded to one ends of metal foils 27 and 28, for example, made of molybdenum, which are sealed inside the sealing portions 23 and 24, respectively. As shown in FIG. 2, the other ends of the metal foils 27 and 28 are welded to the metal rods 29 and 30 made of molybdenum whose ends are exposed to the outside of the sealing parts 23 and 24.
a and 30a are welded together. The metal rod 29 is welded to the lead wire 31 at the welded portion 31a. On the other hand, the metal rod 30 is welded to the base 32 that covers the end of the sealing portion 24. The discharge electrode 25 and the metal rods 29 and 30 are connected to each other through the metal foils 27 and 28 sealed in the sealing portions 23 and 24 as described above. This is to raise the pressure and maintain the high pressure state. That is, the metal rods 29 and 30 have the sealing portion 23 that is different from the glass in the coefficient of thermal expansion.
It is not always easy to improve the adhesiveness with 24 and 24. On the other hand, since the metal foils 27 and 28 are very thin and have a large contact area with the sealing portions 23 and 24, it is possible to easily improve the adhesiveness, and therefore the arc tube 2
The inside of 2 can be easily maintained at a high pressure.

The discharge lamp 21 is arranged so that the gap (arc light emitting portion) between the pair of discharge electrodes 25 is located at the first focal point on the elliptical surface of the reflecting mirror 11, and the base 32 is the bottom portion of the reflecting mirror 11. Lamp fixing hole 11b formed in the
It is sealed and fixed via cement 33. The lead wire 31 of the discharge lamp 21 is taken out of the reflecting mirror 11 through a lead wire hole 11c formed in the wall surface of the reflecting mirror 11. The lead hole 11c is also cement 3
It is sealed by 4.

As described above, the sealing portion 2 on the front glass 12 side
Since 3 is formed longer than the sealing portion 24 on the side of the base 32, the welded portion 29a between the metal foil 27 and the metal rod 29 is formed.
And the distance to the light emitting portion of the discharge lamp 21 becomes longer,
It is possible to suppress the temperature rise of the welded portion 29a. When the temperature was actually measured, the discharge lamp 21 in which the lengths of the sealing portions 23 and 24 were both 25 mm was 200 W.
When the maximum temperature of the arc tube 22 (the inner surface of the upper wall of the arc tube) reaches close to 1,000 ° C. when the lamp is turned on with the lamp power, the temperature of the welded part 29a rises to 507 ° C., In the case of the discharge lamp 21 in which the length of the sealing portion 23 was 35 mm and the length of the sealing portion 24 was 25 mm, the temperature of the welding portion 29a was 388 ° C. at the maximum. This temperature is
IEC60357, which is the regulation for halogen lamps
Although the temperature is higher than the temperature (350 ° C.) described in, the metal foil 27, the metal rod 29, and a welded portion 29a of these.
The temperature is sufficiently low in order to prevent oxidative corrosion and the like. Therefore, even if the adhesion between the metal rod 29 and the sealing portion 23 deteriorates and the welded portion 29a or the like comes into contact with the air in the lamp device 10, it is possible to prevent disconnection due to oxidative corrosion or the like. Similarly, the metal rod 29 and the lead wire 31
It is also possible to suppress the temperature rise in the welded portion 31a with the above, and to prevent disconnection in the welded portion 31a. Therefore, the present invention is not limited to the lamp device using the discharge lamp having the foil sealing structure shown in FIG. 1, but a single rod-shaped wiring member may be used instead of the metal foil 27 and the metal rod 29, or the metal foil 27 may be used. Even when the electrodes 25 are directly penetrated through the sealing portion 23 and the ends thereof are exposed to the outside without being broken, it is possible to prevent disconnection at the welding portion between these and the lead wire 31.

Here, when the ellipsoidal mirror is used as the reflecting mirror 11 as described above and the light emitting portion is provided in the vicinity of the first focal point,
Since the light reflected by the reflecting mirror 11 is focused on the second focus,
It is considered that the heating action by the reflected light increases as the tip of the sealing portion 23 approaches the second focus. However, since the temperature lowering effect due to the tip of the sealing portion 23 moving away from the light emitting portion is generally larger, the temperature of the tip of the sealing portion 23 can be suppressed to a low level as described above. In addition,
A reflective layer is formed over the entire length of the sealing portion 23 or on the outer periphery of the sealing portion 23 at the tip of the sealing portion 23 or near the welded portion 29a to reduce the heating effect of the reflected light and further seal. The temperature of the tip of the portion 23 may be kept low. In addition, when the temperature of the tip of the sealing portion 23 can be kept low only by reducing the heating effect of the reflected light, such as when the lamp power of the discharge lamp 21 is small, the sealing portion 23 is not necessarily the sealing portion 24. Need not be longer than.

<Embodiment 2> An example of a lamp device provided with means for radiating the heat near the sealed portion of the discharge lamp to the outside of the reflecting mirror will be described. In the following embodiments, components having the same functions as those of the lamp device according to the first embodiment and the like are designated by the same reference numerals and the description thereof will be omitted. As shown in FIGS. 3 to 5, the lamp device 10 is provided with a heat dissipation device 41 that dissipates heat near the sealing portion 23 of the discharge lamp 21 to the outside of the reflecting mirror 11. This heat dissipation device 4
Reference numeral 1 denotes a heat absorbing portion 41a which is made of a material having a high thermal conductivity, for example, a copper plate, and which is wound around the sealing portion 23 over substantially the entire length.
And a heat conducting portion 41b for guiding the heat of the heat absorbing portion 41a to the outside of the reflecting mirror 11, and a heat radiating portion 41c for radiating the guided heat.

The heat absorbing portion 41a, which is formed by simply winding a copper plate or the like around the outer periphery of the sealing portion 23, can also obtain a predetermined effect. However, in order to obtain a greater effect, the heat absorbing portion 41a and the sealing portion 23 should be combined. Make them adhere closely. For example, a copper plate is wound with a glass powder having a melting point lower than that of the sealing portion 23 interposed, and then heated and brought into close contact. Further, the larger the contact area (contact length) with the sealing portion 23, the higher the heat absorbing effect of the heat absorbing portion 41a, but the heat absorbing portion 41a is not limited to being wound over substantially the entire length of the sealing portion 23, and the temperature around the welding portion 29a is not limited. It may be partially wound within the range in which the rise can be suppressed.

The heat conducting portion 41b is provided such that the copper plate surface is perpendicular to the front glass 12 so that the projected area in the optical axis direction, that is, the shadowed portion of the projected light becomes small. Further, the portion of the reflecting mirror 11 where the heat conducting portion 41b is led out is cement 42 as shown in FIG.
Is sealed by. Although the width of the heat conducting portion 41b is set to be narrower than the width of the heat absorbing portion 41a in FIG. 3, it may be set to the same width as the heat absorbing portion 41a. The heat dissipation part 41c is provided with a cooling device 43 such as a heat dissipation fin. As the cooling device 43, a cooling fan, a cooling module using a Peltier element, a water cooling device, or the like can be used instead of the radiation fins. A case having high thermal conductivity may be used as the cooling device 43. Further, these may be combined as the cooling device 43. Further, the gas in the space surrounded by the reflecting mirror 11 and the front glass 12 may be circulated between the radiator arranged outside to cool the inside of the lamp device.

With the above structure, the heat transmitted from the light emitting portion of the discharge lamp 21 to the sealing portion 23 by heat conduction is
The heat is absorbed from the heat absorbing part 41a to the heat radiating part 41c outside the reflecting mirror 11 via the heat conducting part 41b. Therefore, the temperature of the sealing portion 23 can be kept low, and disconnection due to oxidative corrosion or the like of the weld portion 29a between the metal rod 29 and the metal foil 27 can be prevented. Further, when the heat absorbing portion 41a is provided at least near the tip portion of the sealing portion 23, the effect of preventing disconnection due to oxidative corrosion of the welded portion 31a between the metal rod 29 and the lead wire 31 can be further enhanced. .

The material of the heat dissipation device 41 is not limited to the copper plate as described above, and the same cooling effect can be obtained if the material has a relatively high thermal conductivity. In addition, the heat conducting section 41
A heat pipe or a thin tube for forcibly circulating a refrigerant may be used for b and the like. In this case, the heat pipe or the thin tube is attached to the lead wire 31, and the reflecting mirror 11
Of the heat pipe or thin tube and the lead wire 31 having a coaxial structure, it is possible to easily suppress the projection light blocked by these. Further, the heat conducting portion 41b is not limited to being provided at only one place, and may be provided at a plurality of places as shown in FIG. 6, for example, so that the heat radiation amount becomes larger. Further, in the example of FIG. 3, an example in which the lengths of the sealing portion 23 and the sealing portion 24 are set equal to each other is shown. However, the present invention is not limited to this, and the sealing portion 23 has the same length as in the first embodiment. The sealing portion 23 may be made shorter if the heat radiation effect of the heat radiation device 41 is sufficiently obtained.

<Embodiment 3> An example of a lamp device in which a discharge lamp is integrally formed with a front glass and a tip of a sealing portion is in contact with outside air will be described. As shown in FIG. 7, in the discharge lamp 21, the end of the sealing portion 23 is formed integrally with the front glass 12, and the welded portion 31 a between the tip of the metal rod 29 and the lead wire 31 is formed on the front glass 12. It is exposed on the outer surface side. In addition, near the front glass 12,
A cooling fan 51 for blowing outside air is provided on the outer surface of 12. With the above configuration, the heat of the tip portion of the sealing portion 23 is radiated from the outer surface of the front glass 12, etc., so that the temperature near the welded portion 29a between the metal foil 27 and the metal rod 29 is low. It is suppressed, and disconnection due to oxidative corrosion of the welded portion 29a and the like is prevented.

Instead of the cooling fan 51, a cooling module or the like using a radiation fin or a Peltier element may be provided near the outer peripheral portion of the front glass 12 so as not to block the projected light, or a combination thereof may be used. You may. Further, when the temperature near the welded portion 29a can be kept sufficiently low due to natural convection near the outer surface of the front glass 12, the cooling fan 51 or the like may not be provided.
Further, in the example of FIG. 7, the tip of the sealing portion 23 only slightly protrudes from the surface of the front glass 12,
When the entire length (length in the optical axis direction) of the lamp device 10 may be long, it may be further projected as shown in FIG. In this way, the welded part 29a is attached to the front glass 1
If it is located on the outer side of the surface of No. 2, it is possible to easily keep the temperature near the welded portion 29a low.

In the example of FIG. 7, the length of the sealing portion 23 is set longer than that of the sealing portion 24 as in the first embodiment, but the length is not limited to this. . That is, even if the distance between the light emitting portion of the discharge lamp 21 and the welded portion 29a is short, the temperature in the vicinity of the welded portion 29a can be suppressed low by heat radiation from the surface of the front glass 12,
As shown in FIG. 9, the sealing portion 23 can be set to have the same length as the sealing portion 24 or to be shorter. Therefore, it is possible to easily configure the lamp device 10 using the discharge lamp 21 having a size relatively larger than the size of the reflecting mirror 11. Further, in addition to the structure in which the discharge lamp and the front glass are integrally formed as described above, the heat dissipation device 41 shown in the third embodiment may be provided.

<< Fourth Embodiment >> Similar to the third embodiment,
Another example of the lamp device in which the discharge lamp is integrally formed with the front glass and the tip of the sealing portion is in contact with the outside air will be described. As shown in FIG. 10, the front glass 12 has a hole 12 a formed in the center thereof, and the end of the sealing portion 23 is provided so as to penetrate therethrough. Sealing portion 23 and hole 12a
The gap between the front glass 12 and the sealing portion 2 is
It is adhered and sealed by a filler 52 made of a material different from 3. More specifically, the filler is preferably a translucent material such as glass having a melting point lower than that of the front glass 12 or the sealing portion 23.

Thus, the front glass 12 and the sealing portion 23
By separately forming and then joining the two, the manufacturing process becomes easier as compared with the lamp device of the third embodiment using the arc tube 21 integrated with the front glass 12. Even in the case of the above configuration, as in the third embodiment, the heat of the tip end portion of the sealing portion 23 is radiated from the outer surface of the front glass 12 and the like, so that the metal foil 27 and the metal rod are also used. The temperature in the vicinity of the welded portion 29a with 29 is kept low, and disconnection due to oxidative corrosion of the welded portion 29a and the like is prevented. Note that various modifications similar to those described in the third embodiment can also be applied to the present embodiment.

In each of the above-mentioned embodiments, an example in which an ellipsoidal mirror is used as a reflecting mirror is shown, but the present invention is not limited to this, and a concave mirror such as a parabolic mirror may be used. In addition, in the above-described embodiments, an example using a discharge lamp having an operating pressure of about 200 atm has been described, but the present invention is applicable to a lamp device using a discharge lamp that operates at a lower pressure, for example, 100 atm or less. Can also be applied. Further, the present invention is not limited to the lamp device using the discharge lamp having the foil-sealed structure described in the embodiment, and the welding portion of the wiring member, which may be thermally deteriorated due to high temperature, is arranged in the vicinity of the discharge lamp. It can be applied to a lamp device using any discharge lamp. Further, although the gas in the lamp device is not particularly described, air may be enclosed or an inert gas such as argon gas may be enclosed. Further, in addition to or instead of the above respective configurations, the gas in the lamp device may be circulated with an external radiator to cool the interior of the lamp device.

[0037]

According to the present invention, the temperature of the tip of the sealing portion can be kept low, and disconnection due to oxidation or the like of the welded portion of the wiring member can be prevented. The defect rate can be reduced. Further, it is possible to easily increase the lamp power and downsize the reflecting mirror. Further, according to the present invention, since it is possible to suppress an excessive temperature rise inside the device even if the lamp device is sealed, it is possible to suppress the explosion sound of the arc tube,
Furthermore, it is possible to reliably prevent the scattering of glass fragments and the release of mercury vapor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a lamp device according to a first embodiment.

FIG. 2 is a longitudinal sectional view showing a discharge lamp used in the lamp device.

FIG. 3 is a vertical sectional view showing a lamp device according to a second embodiment.

FIG. 4 is a vertical cross-sectional view showing the main parts of the lamp device.

FIG. 5 is a front view in which a part of the lamp device is cut away.

FIG. 6 is a front view showing another lamp device according to the second embodiment.

FIG. 7 is a vertical sectional view showing a lamp device according to a third embodiment.

FIG. 8 is a vertical sectional view showing another lamp device according to the second embodiment.

FIG. 9 is a vertical sectional view showing still another lamp device according to the third embodiment.

FIG. 10 is a vertical sectional view showing a lamp device according to a fourth embodiment.

[Explanation of symbols]

10 Lamp device 11 Reflector 11a reflective surface 11b Lamp fixing hole 11c Lead wire hole 12 Front glass 12a hole 12 Front glass 22 arc tube 23 Sealing part 24 Sealing part 25 discharge electrode 26 Mercury 27, 28 Metal foil 29, 30 Metal rod 29a, 30a Welded part 31 lead wire 31a welded part 32 mouthpiece 33, 34, 42 cement 41 Heat dissipation device 41a Heat absorbing part 41b Heat conduction part 41c Heat dissipation part 43 Cooling device 51 cooling fan 52 Filling material

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoyuki Seki 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Go Ichibankase 1006 Kadoma, Kadoma, Osaka Matsushita Electric Sangyo Co., Ltd. (56) Reference JP-A-10-294013 (JP, A) JP-A-8-45473 (JP, A) JP-A-11-39934 (JP, A) JP-A-4-282553 (JP , A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 61/52 H01J 61/36 H01J 61/50 H01J 61/88

Claims (3)

(57) [Claims] 1. A high-pressure mercury vapor discharge lamp comprising a light-emitting tube in which a pair of electrodes are arranged to face each other in a tube in which a light-emitting substance is sealed, and a pair of sealing parts extending from the light-emitting tube; A reflecting device for reflecting light emitted from a lamp, and a transparent member which covers an opening of the reflecting mirror and accommodates the discharge lamp in a space between the reflecting mirror, wherein: The reflecting mirror is sealed with the transparent member, and the sealing portion arranged on the transparent member side is integrated with the transparent member. 2. The high-pressure mercury vapor discharge lamp comprises approximately 20
The lamp device according to claim 1, wherein the lamp device has an atmospheric pressure of 0 atm. 3. The lamp device according to claim 1, further comprising cooling means for removing heat conducted to an outer surface of the transparent member in the sealing portion arranged on the transparent member side.