JP2003059454A - Short arc type discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short arc type discharge lamp allowing miniaturization of the lamp, and capable of high output by cooling a sealing part of a lead bar in stepped connection glass. SOLUTION: This short arc type discharge lamp 1 installs a base 5 having vent holes 51 and 52 for passing cooling air in a sealing tube 12 by sealing the sealing tube 12 continuing with an arc tube 11 and the lead bar 3 for supporting an electrode arranged in the arc tube 11 by the stepped connection glass 4, and is characterized by arranging a partition plate 6 formed so that the cooling air flowed in from the vent holes 51 and 52 flows in the sealing part 41 in an opening part 42 in inside spaces 71 and 72 of the base 5 formed outside the opening part 42 of the stepped connection glass 4 through which the lead bar 3 penetrates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short arc type discharge lamp, for example, by applying light to a light modulation element,
The present invention relates to a short arc type discharge lamp suitable for a light source such as a projection device that projects an image with reflected light.

[0002]

2. Description of the Related Art Conventionally, as a light source of a projection device such as a projector, a short arc type discharge lamp in which xenon is enclosed in an arc tube as shown in FIG. 9 is known. Since the internal pressure of the arc tube is extremely high during lighting to increase the brightness of this lamp, it is necessary to design so that the lamp sealing part will not be damaged even with high internal pressure. Since it is necessary to project the lead rod supporting the discharge electrode to the outside from the sealing portion following the arc tube, the stepped glass is used for sealing between the sealing tube and the lead rod. .

By the way, in recent years, carrying a projection device incorporating such a short arc type discharge lamp,
It tends to be used in various places. Therefore, the projection apparatus is required to be compact and small, and the lamp is also required to be miniaturized. In order to reduce the size of the lamp, it is necessary to shorten the length of the lamp. In the case of the conventional short arc type discharge lamp as shown in FIG. 9, the lead rod is formed by the rear end of the discharge electrode and the step glass. It is necessary to shorten the distance L between the sealed portions where and are sealed. But,
When this distance L is shortened, the sealing portion of the stepped glass and the discharge electrode come close to each other, and the temperature of the sealing portion rises,
The problem that the sealing part is damaged occurs.

Conventionally, in order to prevent the temperature rise of the sealing portion of such a short arc type discharge lamp, in Japanese Utility Model Registration Publication No. 2532712, a cooling fin or the like is attached to a lead rod protruding outside the sealing portion. The cooling means is provided to cool the sealing portion to prevent the temperature rise of the sealing portion.

[0005]

However, since the cooling means as shown in the above-mentioned prior art does not directly cool the sealing portion, the cooling effect is weak and the distance L cannot be shortened sufficiently. There's a problem. Further, in a high output short arc type discharge lamp having an input power of 2.5 kw or more, there is a problem that the sealed portion is not sufficiently cooled even if the lead rod is cooled.

In view of the above-mentioned various problems, an object of the present invention is to reliably cool the sealing portion of the lead rod in the stepped glass, thereby making it possible to reduce the size of the lamp and increase the output of the short arc. Type discharge lamp.

[0007]

The present invention employs the following means in order to solve the above problems. A first means is a base having a sealing tube following the arc tube and a lead rod supporting an electrode arranged in the arc tube sealed by a step glass, and having a ventilation port for passing cooling air through the sealing tube. In the short arc type discharge lamp to which is attached, in the internal space of the base formed outside the opening of the stepped glass through which the lead rod penetrates, the cooling air that has flowed in from the ventilation port is in the opening. A partition plate is arranged so that the lead rod is introduced into a sealing portion sealed by the stepped glass.

A second means is characterized in that, in the first means, the partition plate is arranged so as to extend into the opening.

A third means is the first means or the second means, wherein the opening portion of the opening in the direction perpendicular to the ventilation surface of the partition plate is parallel to the ventilation surface of the partition plate. It is characterized in that it is relatively enlarged from the opening portion.

A fourth means is the means according to any one of the first means to the third means, wherein the lead rod has a flat portion in the opening, which is parallel to the ventilation surface of the partition plate. It is characterized by being.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the configuration of a short arc type discharge lamp 1 according to the present embodiment,
2 and 3 are an enlarged sectional perspective view and an enlarged perspective view in the vicinity of the base shown in FIG. In these figures, 1 is a short arc type discharge lamp, 11 is an arc tube of a short arc type discharge lamp in which a discharge electrode 2 is arranged, 12 is a sealing tube formed continuously on both ends of the arc tube 11, 2 Is a discharge electrode, 3 is a lead rod that supports the discharge electrode 2, and 4 is a sealing tube 1.
2 is a stepped glass for sealing the lead rod 3, 41 is a sealing portion for the stepped glass 4 for sealing the lead rod 3, and 42 is a stepped glass for the lead rod 3 to penetrate and open to the inner space of the base 5. Openings 5, 5 are caps provided outside both ends of the sealing tube 12, 51 are caps 5 opened to allow cooling air to flow in.
Inflow side ventilation port, 52 is an outflow side ventilation port of the mouthpiece 5 opened for outflowing the cooling air, 6 is attached to the lead rod 3, and the cooling air flown in from the inflow side ventilation port 51 is opened 4
A partition plate having a ventilation surface 61 that introduces the air into the inside 2 and discharges the air discharged from the opening 42 from the outflow side ventilation opening 52,
Reference numeral 71 denotes an inflow side ventilation opening 51, a partition plate 6, and an opening 42.
A cooling air inflow side space is formed between them, and a cooling air outflow side space 72 is formed between the outflow side ventilation port 52, the partition plate 6 and the opening 42.

As shown in these figures, in the short arc type discharge lamp of this embodiment, when the lamp is lit,
Cooling air from a cooling device (not shown) flows into the inflow-side ventilation port 5
When the cooling air is introduced into the space 71 on the cooling air inflow side from 1, the partition plate 6
Of the stepped glass 4 guided by the ventilation surface 61 of the opening 4
The air is blown from 2 toward the inner sealing portion 41. As a result, the cooling air cools the lead rod 3 and the sealing portion 41. The cooled air is discharged from the opening 42 to the cooling air outflow side space 72, and the outflow side opening 52
Spilled from.

As described above, according to the invention of this embodiment, since the sealing portion 41 of the stepped glass 4 can be cooled by the cooling air, the distance between the electrode 2 and the sealing portion 41 can be shortened. Since the lamp length can be shortened, the lamp can be downsized and the output can be increased. Further, even if the lamp is not downsized, it is possible to downsize the cooling device that sends the cooling air and to cool the cooling fan.

A specific configuration example of the short arc type discharge lamp according to the invention of this embodiment will be described below with reference to FIG. Both ends of the short arc type discharge lamp (base 5,
5) The dimension A between the two is 240 mm, the dimension B between the electrode 2 and the base 5 is 120 mm, and the dimension C between the electrode 2 and the sealing portion 41 is 65.
mm, the dimension D between the sealing portion 41 and the opening 42 is 20 mm,
The dimension E between the opening 42 and the end of the base 5 is 20 mm, the dimension F between the electrodes is 3 mm, and the outer diameter φ of the sealing tube is 50 mm. In this short arc type discharge lamp, the lamp voltage at the time of lighting is 30V, the lamp current is 83A, and the input power is 2500.
At W, the temperature of the sealed portion 41 was 450 ° C., and a temperature decrease of nearly 100 ° C. was observed compared to 550 ° C. of the conventional one.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a sectional view showing the configuration of the short arc type discharge lamp according to the present embodiment, and FIGS. 5 and 6 are an enlarged sectional perspective view and an enlarged perspective view in the vicinity of the base shown in FIG. In these figures, 8 is the lead rod 3
And a partition plate having a ventilation surface 81 for introducing the cooling air that has flowed in from the inflow side ventilation port 51 into the inside of the opening portion 42 and for allowing the air discharged from the opening portion 42 to flow out from the outflow side ventilation port 52. Is a plate-shaped portion of the partition plate 8 that is provided in the internal spaces 71 and 72 of the base 5 and that introduces the cooling air that flows in from the inflow-side ventilation port 51 into the opening 42, and 83 denotes the stepped glass 4 The opening 42 is provided inside the opening 41.
Partition plate 8 that introduces the cooling air flowing in from the sealing portion 41
Is an extension of. The extending portion 83 may be formed integrally with the plate-shaped portion 82 or may be formed separately.
The other configurations correspond to the configurations of the same reference numerals shown in FIGS. 1 to 3, and therefore the description thereof will be omitted.

As shown in these figures, in the short arc type discharge lamp of this embodiment, when the lamp is lit,
Cooling air from a cooling device (not shown) flows into the inflow-side ventilation port 5
When the cooling air is introduced into the space 71 on the cooling air inflow side from 1, the partition plate 6
Guided by the ventilation surface 81, specifically, the plate-shaped portion 82,
The air is blown into the opening 42. The cooling air introduced into the opening 42 is guided by the extending portion 83 to the sealing portion 41 in the step glass 4. As a result, the lead portion 3 is cooled by cooling the extending portion 83 with the cooling air, and the sealing portion 41 is effectively cooled with the introduced cooling air. The cooled air is guided to the back surface side of the extending portion 83 of the partition plate 8 and is discharged from the opening 42 to the cooling air outflow side space 72, and is discharged from the outflow side opening 52.

As described above, according to the short arc type discharge lamp of the present embodiment, as compared with that of the first embodiment,
Since the partition plate 8 is provided with the extending portion 83, it is possible to further increase the inflow / outflow of the cooling air to / from the sealing portion 41 in the stepped glass 4, so that the sealing portion 41 is more effectively. It can be cooled, and as a result, the electrode 2 and the sealing portion 4 can be further layered.
1 can be shortened, and the size and the output of the lamp can be further reduced. Further, similarly to the above, even when the lamp is not downsized, it is possible to downsize the cooling device that blows the cooling air and to cool the cooling fan.

FIG. 7 and FIG. 8 are views showing a partial configuration of a short arc type discharge lamp according to another embodiment, respectively.

FIG. 7 is a cross-sectional view of the stepped glass 4 viewed from the opening 42 side of a modified short arc discharge lamp in which the opening 42 of the stepped glass 4 is modified in the first or second embodiment. As shown in the figure, the shape of the opening 42 is such that the opening 422 in the vertical direction is larger than the opening 421 in the direction parallel to the ventilation surfaces 61, 81 of the partition plate 6 or the partition plate 8, Open in an elliptical shape.

According to the short arc type discharge lamp of the present embodiment, the cooling air introduced into the cooling air inflow side space 71 from the opening 42 is different from those of the first and second embodiments. It becomes easy to flow in, and it becomes easy to flow out from the opening 42. As a result, the cooling air can easily flow in and out of the sealing portion 41 in the stepped glass 4, and the sealing portion 41 can be cooled more effectively.

FIG. 8 shows a short arc type discharge lamp having a structure in which the lead rod 3 is deformed in the opening 42 of the step glass 4 in the first and second embodiments from the opening 42 side. FIG. As shown in the figure, a part of the lead bar 3 near the opening 42 is formed by processing such as cutting, rolling, and crushing, and the part parallel to the ventilation surface 61 of the partition plate 6 has a flat shape. A flat portion 31 is provided.

According to the short arc type discharge lamp of the present embodiment, the cooling air introduced into the cooling air inflow side space 71 by the flat portion 31 is different from those of the first and second embodiments. Are more likely to flow in through the opening 42 and more easily flow out through the opening 42. As a result, the flow of cooling air into and out of the stepped glass 4 is facilitated, and the sealing portion 41
Can be cooled more effectively.

[0023]

According to the invention as set forth in claim 1, the cooling air that has flowed in from the ventilation port is introduced into the internal space of the mouthpiece formed outside the opening of the stepped glass through which the lead rod penetrates. Since the partition plate formed so as to flow into the sealing portion is arranged, the sealing portion can be cooled by the cooling air, so that the distance between the electrode and the sealing portion is shortened and the lamp length is shortened. Therefore, the lamp can be downsized and the output can be increased. Also, even if you do not downsize the lamp,
It is possible to downsize the cooling device that sends the cooling air and to make the cooling fan quiet.

According to the invention described in claim 2, since the partition plate is arranged so as to extend into the opening, compared with the invention described in claim 1, it is possible to further improve the connection glass. Since the sealing part can be cooled by the cooling air, the distance between the electrode and the sealing part can be shortened, and the lamp length can be shortened, which enables further downsizing and higher output of the lamp. Become.

According to the third aspect of the invention, in the opening, the opening portion in the direction perpendicular to the ventilation surface of the partition plate is relatively enlarged as compared with the opening portion in the direction parallel to the ventilation surface of the partition plate. Therefore, as compared with the invention according to claims 1 and 2, the sealing portion of the stepped glass can be further cooled by the cooling air, so that the distance between the electrode and the sealing portion can be shortened and the lamp can be reduced. Since the length can be shortened, the lamp can be further downsized and the output can be increased.

According to the invention described in claim 4, since the lead rod in the opening is formed flat in a portion parallel to the ventilation surface of the partition plate, the invention described in claims 1, 2 and 3 Compared to the above, since the sealing part of the stepped glass can be cooled further by the cooling air, the distance between the electrode and the sealing part can be shortened and the lamp length can be shortened. It is possible to reduce the size and increase the output.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a short arc type discharge lamp according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional perspective view of the vicinity of the base shown in FIG.

FIG. 3 is an enlarged perspective view of the vicinity of the base shown in FIG.

FIG. 4 is a cross-sectional view showing a configuration of a short arc type discharge lamp according to a second embodiment of the present invention.

5 is an enlarged cross-sectional perspective view near the base shown in FIG. 4. FIG.

FIG. 6 is an enlarged perspective view of the vicinity of the base shown in FIG.

FIG. 7 is a cross-sectional view according to another embodiment of the present invention, viewed from the opening 42 side of a short arc discharge lamp in which the opening 42 of the step glass 4 is modified.

FIG. 8 is a cross-sectional view of a short arc type discharge lamp having a structure in which a lead rod 3 is deformed in an opening 42 of a stepped glass 4 according to another embodiment of the present invention, as viewed from the opening 42 side. .

FIG. 9 is a sectional view showing a configuration of a short arc type discharge lamp according to a conventional technique.

[Explanation of symbols]

1 Short arc type discharge lamp 11 arc tube 12 Sealed tube 2 discharge electrodes 3 lead rod 31 Flat part 4 step glass 41 Sealing part 42 opening 421 opening 422 opening 5 mouthpiece 51 Inflow side ventilation port 52 Outflow side ventilation port 6 partition boards 61 Ventilation surface 71 Cooling air inflow side space 72 Cooling air outflow side space 8 partition boards 81 Ventilation surface 82 Plate 83 Extension

Continued front page    F-term (reference) 5C039 AA02                 5C043 AA09 CC01 CD01 DD13 DD39                       EA19

Claims (4)

[Claims] 1. A sealing tube following the arc tube and a lead rod supporting an electrode arranged in the arc tube are sealed by a step glass, and a cap having a ventilation port for passing cooling air is provided in the sealing tube. In the attached short arc type discharge lamp, in the inner space of the base formed outside the opening of the stepped glass through which the lead rod penetrates, the cooling air that has flowed in from the ventilation port is in the opening. A short arc type discharge lamp comprising a partition plate formed so that a lead rod is introduced into a sealing portion sealed by the stepped glass. 2. The short arc type discharge lamp according to claim 1, wherein the partition plate is arranged so as to extend into the opening. 3. The opening portion is characterized in that an opening portion in a direction perpendicular to a ventilation surface of the partition plate is relatively enlarged as compared with an opening portion in a direction parallel to the ventilation surface of the partition plate. The short arc type discharge lamp according to claim 1 or 2. 4. The lead rod, in the opening,
The short arc discharge lamp according to any one of claims 1 to 3, wherein a part of the partition plate parallel to the ventilation surface is formed flat.