JP2003132845A - Short arc discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short arc discharge lamp, capable of cooling certainly the sealed part of a step-jointed glass and a lead rod, making the lamp small in size and high-power output without exerting load on the part. SOLUTION: The short arc discharge lamp comprises an arc tube 11, a sealing tube 12 next to the arc tube 11, a lead rod 3 which supports an electrode put in the arc tube, a step-jointed glass which seals the sealing tube 12 and the lead rod 3, a base 5 having air holes 51 and 52 to lead cooling air into the sealing tube 12. In the internal space of the base 5 on the outside direction of the step-jointed glass, in which the lead rod 3 is running, baffle plates 6 spaced from the lead rod 3 or lead wire connected to the rod is formed, to lead cooling air from the air hole 51 to the space.

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 is known as shown in FIG.
Since this lamp has a very high internal pressure of the arc tube during lighting to increase brightness, it is necessary to design so that the lamp sealing part will not be damaged even with high internal pressure.
Since a large current is passed through the lamp, it is necessary to project the lead rod supporting the discharge electrode from the sealing part following the arc tube to the outside. Has been adopted.

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 compact, 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. 15, 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. However, if the distance L is shortened, the sealing portion of the stepped glass and the discharge electrode are brought close to each other, the temperature of the sealing portion rises, and the sealing portion is damaged.

Conventionally, in order to prevent the temperature rise of the sealing portion of such a short arc type discharge lamp, according to Utility Model Registration Publication No. 2532712, a cooling fin is attached to a lead rod protruding outside the sealing portion. A means for preventing the temperature rise of the sealing portion by providing a cooling member such as the above to cool it is adopted.

[0005]

However, in the cooling means as disclosed in the above publication, since the radiation fin is attached to the lead rod, the weight of the cooling fin causes the sealing portion between the lead rod and the step glass to be attached. The load may be applied and the sealing part may be damaged.

Further, as described above, in the prior art, the sealing portion cannot be cooled sufficiently, so that the distance L cannot be shortened so much.

In view of the above-mentioned various problems, an object of the present invention is to provide a sealing portion between the lead rod and the step glass without applying any load to the sealing portion between the step glass and the lead rod. It is intended to provide a short arc type discharge lamp in which the lamp is surely cooled and the lamp is downsized and the output is increased.

[0008]

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 in which is attached, a gap from the lead rod or the lead wire connected to the lead rod is provided in the inner space of the base formed outside the step glass through which the lead rod penetrates. And a baffle plate for guiding the cooling air introduced from the ventilation port to the gap.

A second means is the short arc type discharge lamp according to the first means, wherein a sealing tube following the arc tube and a lead rod for supporting an electrode arranged in the arc tube are sealed by a step glass. In the space formed outside the stepped glass through which the lead rod penetrates, a space is provided from the lead rod or the lead wire connected to the lead rod, and the cooling air introduced is introduced into the space. It is characterized in that a baffle plate for guiding air is provided.

A third means is the first means or the second means, wherein the baffle plate has an angle within 180 degrees at a portion of the baffle plate facing the lead rod or the lead wire. It is characterized in that it is formed as follows.

A fourth means is the means according to any one of the first means to the third means, wherein a plurality of the air guide plates are arranged in a radial direction from the lead rod. To do.

[0012]

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 a configuration of a short arc type discharge lamp 1 according to the present embodiment, and FIG. 2 shows a lead rod and a baffle plate at ventilation ports 51, 52 viewed from the axial direction of the short arc type discharge lamp 1. It is a figure which shows the positional relationship of.

In the figure, 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, and 12 is a sealing tube formed continuously on both ends of the arc tube 11. 2 is a discharge electrode, 3 is a discharge electrode 2
4 is a stepped glass that seals the sealing tube 12 and the lead rod 3, 41 is a sealing portion of the stepped glass 4 that seals the lead rod 3, and 5 is both ends of the sealing tube 12. A base provided outside the portion, 51 is an inflow side ventilation port provided in the base and opened for inflowing cooling air, 52 is an outflow side ventilation port provided in the base and opened for outflowing the cooling air, Reference numeral 6 denotes a baffle plate that is attached to a position other than the lead rod 3 and that is provided with a plurality of gaps between the lead rod 3 and a predetermined gap K, and that guides the cooling air flowing from the inflow side ventilation port 51 to the gap K. Is. The gap K is set to an optimum gap for cooling the lead rod 3 or the lead wire whose flow velocity is increased when the cooling air guided by the baffle plate 6 passes through the gap K.

Here, four plate-shaped baffle plates 6 are lead rods 6 or lead rods 6 protruding from the sealing tube 12 to the outside.
Are provided so as to be radially separated from each other via a predetermined gap K from a lead wire (not shown) connected to. That is, as shown in FIG. 2, each baffle plate 6 is arranged at a predetermined angle with each adjacent baffle plate 6 in the radial direction from the lead rod 3.

FIG. 3 is a view showing an example of a projection device such as a projector using the short arc type discharge lamp shown in FIG.

In the figure, 7 is a reflecting mirror that reflects the light emitted from the short arc type discharge lamp 1 in a predetermined direction, 8 is a housing of the projection device, and 81 is the light that is reflected from the reflecting mirror 7. A radiation window, 82 is a cooling air inlet for introducing cooling air into the housing 8, and 83 is an outlet for discharging the cooled air. Here, the inside of one of the caps 5 of the short arc type discharge lamp located on the cooling air introduction port 82 side is disclosed and shown.

As shown in these figures, in the short arc type discharge lamp 1 of the present embodiment, when the lamp is turned on, cooling air is introduced from a cooling device (not shown) into the housing 8 through the cooling air introduction port 82. Then, the gas is introduced into the base 5 from an inflow side ventilation port 51 provided in the base 5 of the short arc type discharge lamp 1. The introduced cooling air is guided toward the lead rod 3 or the lead wire along the inclined surface of the wind guide plate 6, and further through the gap K formed between the wind guide plate 6 and the lead rod 3 or the lead wire. The lead rod 3 or the lead wire is cooled.

That is, the cooling air guided by the baffle plate has a high flow velocity when flowing through the narrow gap K between the baffle plate 6 and the lead rod 3 or the lead wire. Even if the flow velocity and flow rate are small, the lead rod 3 or the lead wire can be effectively cooled, and as a result, the sealing portion 41 between the step glass 4 and the lead rod 3 can be reliably cooled.

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 outer opening of the stepped glass is 20 mm, and the dimension E between the opening and the end of the base 5 is 20.
mm, dimension F between electrodes is 3 mm, outer diameter φ of the sealing tube is 50 m
m. In this short arc type discharge lamp, when the lamp voltage is 30 V, the lamp current is 83 A, and the input power is 2500 W, the temperature of the sealed portion is 450 ° C.
Thus, a temperature decrease of nearly 100 ° C. was observed as compared with the conventional one of 550 ° C.

In this embodiment, as shown in FIG. 2, an example has been described in which four air guide plates 6 are radially arranged with respect to the lead rod 3 or the lead wire with a predetermined gap K therebetween. The baffle plate is not limited to such a configuration.

FIGS. 4 and 5 show the positional relationship between the lead rods and the baffle plates of the short arc discharge lamps according to the second and third embodiments in which the number of installed baffle plates 6 of the present embodiment is different. FIG.

In the short arc type discharge lamp shown in FIG. 4, one wind guide plate 6 is radially arranged with respect to the lead rod 3 or the lead wire with a gap K therebetween. In the type discharge lamp, when the cooling air is introduced into the base 5 from the inflow side ventilation opening 51 of the short arc type discharge lamp 1 when the lamp is lit, the cooling air flows along the baffle plate 6 or the lead rod 3 or the lead. The air is guided toward the wires, and further, the flow speed is increased through the gaps K formed between the lead rods 3 or the lead wires to ventilate the air, so that the lead bars 3 or the lead wires can be effectively cooled. . In FIG. 4, the gap K is interposed between the baffle plate 6 and the lead rod 3 or the lead wire.
The baffle plate 6 and the lead rod 3 or the lead wire may be arranged in contact with or close to each other without providing the gap K. In this case, the introduced cooling air is guided by the air guide plate 6 to the lead rod 3 or the lead wire to be cooled.

In the short arc type discharge lamp shown in FIG. 5, two wind guide plates 6 are radially arranged with respect to the lead rod 3 or the lead wire with a gap K therebetween. According to the type discharge lamp, when the cooling air is introduced into the base 5 from the inflow side ventilation opening 51 of the short arc type discharge lamp 1 when the lamp is lit, the cooling air is
The air is guided toward the lead rods 3 or the lead wires along the baffle plate 6 of a sheet, and further, the flow velocity is increased through the gap K formed between the lead rods 3 or the lead wires, so that the leads are led. The rod 3 or the lead wire can be cooled effectively. It should be noted that, also in FIG. 5, the air guide plate 6 and the lead rod 3 or the lead wire may be arranged so that the gap K is not interposed therebetween. In this case, the cooling air is guided to the lead rod 3 or the lead wire by the air guide plate 6 which does not interpose the one gap K, and the air guide plate 6 which is arranged through the other gap K.
Depending on the condition, the air is blown into the gap K, and the lead rod 3 or the lead wire is cooled.

The short arc type discharge lamp according to the first to third embodiments has the base 5, and the base 5 has an inflow side vent 51 and an outflow side vent 52 at predetermined positions. Therefore, each baffle plate 6 needs to be provided at an optimum position and angle with respect to the positions of the inflow side ventilation port 51 and the outflow side ventilation port 52.

As described above, according to the first to third embodiments of the present invention, the lead rod 3 is cooled without applying any load to the sealing portion between the step glass 4 and the lead rod 3. Since the sealing portion 41 of the stepped glass 4 can be cooled accordingly, the distance between the electrode 2 and the sealing portion 41 can be shortened, and the lamp length can be shortened. It is possible to downsize the lamp and increase the output. 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.

Next, fourth to sixth embodiments of the present invention will be described with reference to FIGS. 6 to 8, respectively. FIGS. 6 to 8 show the positional relationship between the lead rod and the baffle plate of the short arc type discharge lamp having no base with respect to the short arc type discharge lamp having the base according to the first to third embodiments, respectively. FIG.

The short arc type discharge lamp shown in FIG. 6 shows a case where four air guide plates 6 are radially arranged with respect to the lead rod 3 or the lead wire with a gap K therebetween. The plate 6 is attached to the sealing tube 12.

According to the invention of this embodiment, when the cooling air is introduced into the short arc type discharge lamp 1 when the lamp is lit, the cooling air is directed along the air guide plate 6 toward the lead rod 3 or the lead wire. Since the air is guided by the air, and the air is blown with the flow velocity increased through the gap K formed between the lead rods 3 or the lead wires, the lead rods 3 or the lead wires can be effectively cooled. Further, in the invention of the present embodiment, the case where the four air guide plates 6 are radially arranged has been described. However, when at least three air guide plates are used, each air guide plate is used with respect to the lead rod 3. By appropriately setting the mounting angle of the plate, the lead rod 3 is always installed regardless of the mounting angle of the short arc type discharge lamp to a device such as a projection device.
It is possible to stably cool the lead wire.

In the short arc type discharge lamp shown in FIG. 7, one baffle plate 6 is arranged radially with respect to the lead rod 3 or the lead wire with a gap K between them. 6 is attached to the sealing tube 12.

According to the invention of this embodiment, when the cooling air is introduced into the short arc type discharge lamp 1 when the lamp is lit, the cooling air is directed along the air guide plate 6 toward the lead rod 3 or the lead wire. Since the air is guided by the air, and the air is blown with the flow velocity increased through the gap K formed between the lead rods 3 or the lead wires, the lead rods 3 or the lead wires can be effectively cooled. Although FIG. 7 shows the case where the gap K is interposed between the baffle plate 6 and the lead rod 3 or the lead wire, the gap K is not provided,
You may arrange | position so that the baffle plate 6 and the lead rod 3 or a lead wire may contact or adjoin. In this case, the introduced cooling air is guided by the air guide plate 6 to the lead rod 3 or the lead wire to be cooled.

The short arc type discharge lamp shown in FIG. 8 shows a case in which two air guide plates 6 are radially arranged with respect to the lead rod 3 or the lead wire with a gap K therebetween. 6 is attached to the sealing tube 12.

According to this embodiment, when the cooling air is introduced into the short arc type discharge lamp 1 when the lamp is lit, the cooling air is applied to the lead rod 3 or the lead wire along the two air guide plates 6. The air is guided toward the air, and further, the air is flown with the flow velocity increased through the gap K formed between the lead rods 3 or the lead wires, so that the lead rods 3 or the lead wires can be effectively cooled. Note that, also in FIG. 8, the air guide plate 6 and the lead rod 3 or the lead wire may be arranged so that the gap K is not interposed therebetween. In this case, the cooling air is guided to the lead rod 3 or the lead wire by the baffle plate 6 which does not interpose the one gap K, and the gap K is caused by the baffle plate 6 arranged through the other gap K. The lead rod 3 or the lead wire can be cooled by being ventilated.

Next, seventh to ninth embodiments of the present invention will be described with reference to FIGS. 9 to 11, respectively. 9 to 11 show lead rods 3 of a short arc type discharge lamp in which a wind guide plate 6 having a different shape from the wind guide plate in the short arc type discharge lamp according to the first to third embodiments is used. It is a figure which shows the positional relationship of the air guide body.

In the short arc type discharge lamp shown in FIG. 9, three block-shaped baffle plates 6 each having an acute angle at a portion 61 whose sectional shape faces the lead rod 3 are attached to the lead rod 3 or the lead wire. It shows a case in which they are arranged radially through a gap K.

According to the invention of this embodiment, when the cooling air is introduced into the base 5 from the inflow side ventilation opening 51 of the short arc type discharge lamp 1 when the lamp is lit, the cooling air flows to the baffle plate 6. The air is guided toward the lead rods 3 or the lead wires along the inclined surface, and the flow velocity is accelerated through the gap K formed between the lead rods 3 or the lead wires, so that the lead rods 3 or the lead wires are led. The wire can be cooled effectively. In the short arc type discharge lamp shown in FIG. 10, one block-shaped baffle plate 6 having a sharp cross-section at a portion 61 facing the lead rod 3 has a gap K with respect to the lead rod 3 or the lead wire. It shows a case where they are arranged in a radial pattern.

According to this embodiment, when the lamp is turned on, the cooling air is blown into the inlet 51 of the short arc discharge lamp 1.
When introduced into the base 5 from the cooling air, the cooling air is guided toward the lead rods 3 or the lead wires along the inclined surface of the baffle plate 6, and the gap formed between the lead rods 3 or the lead wires. Since the flow velocity is increased and air is passed through K, the lead rod 3 or the lead wire can be effectively cooled. Although the gap K is interposed between the baffle plate 6 and the lead rod 3 or the lead wire in FIG. 10, the baffle plate 6 and the lead rod 3 are not provided with the gap K.
Alternatively, they may be arranged so as to be in contact with or close to the lead wires. In this case, the introduced cooling air is guided by the air guide plate 6 to the lead rod 3 or the lead wire to be cooled.

In the short arc type discharge lamp shown in FIG. 11, two block-shaped baffle plates 6 each having an acute angle at a portion 61 facing the lead rod 3 in cross section are connected to the lead rod 3 or the lead wire. It shows a case in which they are arranged radially through a gap K.

According to this embodiment, when the lamp is turned on, the cooling air is blown into the inflow side ventilation opening 51 of the short arc type discharge lamp 1.
When introduced into the cap 5 from the cooling air, the cooling air is guided toward the lead rods 3 or the lead wires along the inclined surface of each air guide plate 6, and is further formed between the lead rods 3 or the lead wires. Since the flow velocity is increased through the gap K and the air is ventilated, the lead rod 3 or the lead wire can be effectively cooled. It should be noted that, also in FIG. 11, the air guide plate 6 and the lead rod 3 or the lead wire on one side may be arranged so that the gap K is not interposed. In this case, the cooling air is guided to the lead rod 3 or the lead wire surface by one air guide plate 6, and the flow velocity is increased through the gap K depending on the other air guide plate 6 arranged through the gap K. Since the air is blown and ventilated, it is possible to effectively cool the lead rod 3 or the lead wire.

Next, tenth to twelfth embodiments of the present invention will be described with reference to FIGS. 12 to 14, respectively.
12 to 14 show the cap 5 in the short arc type discharge lamp according to the seventh to ninth embodiments, respectively.
It is a figure which shows the positional relationship of the lead rod and baffle plate of a short arc type discharge lamp when not using.

In the short arc type discharge lamp shown in FIG. 12, three block-shaped baffle plates 6 each having an acute angle at a portion 61 facing the lead rod 3 in cross section are provided with respect to the lead rod 3 or the lead wire. It shows a case in which they are arranged radially through a gap K.

According to the present embodiment, when the cooling air is introduced into the short arc type discharge lamp 1 when the lamp is lit, the cooling air is applied to the lead rod 3 or the lead wire along the inclined surface of the baffle plate 6. The air is guided toward the air, and further, the flow speed is increased through the gap K formed between the lead rods 3 or the lead wires, and the air is blown, so that the lead rods 3 or the lead wires can be cooled.

In the short arc type discharge lamp shown in FIG. 13, one block-shaped baffle plate 6 having an acute angle at a portion 61 facing the lead rod 3 in cross section is attached to the lead rod 3 or the lead wire. It shows a case in which they are arranged radially through a gap K.

According to this embodiment, when the cooling air is introduced into the short arc type discharge lamp 1 when the lamp is lit, the cooling air is applied to the lead rod 3 or the lead wire along the inclined surface of the baffle plate 6. The air is guided toward the air, and further, the air is flown with the flow velocity increased through the gap K formed between the lead rods 3 or the lead wires, so that the lead rods 3 or the lead wires can be effectively cooled. In FIG. 13, the gap K is interposed between the baffle plate 6 and the lead rod 3 or the lead wire, but the baffle plate 6 and the lead rod 3 or the lead is not provided without the gap K. You may arrange | position so that a line may be contacted or adjoined. In this case, the introduced cooling air is guided by the air guide plate 6 to the lead rod 3 or the lead wire to be cooled.

In the short arc type discharge lamp shown in FIG. 14, two block-shaped baffle plates 6 each having an acute angle at a portion 61 facing the lead rod 3 in cross section are connected to the lead rod 3 or the lead wire. It shows a case in which they are arranged radially through a gap K.

According to the present embodiment, when the cooling air is introduced into the short arc type discharge lamp 1 when the lamp is lit, the cooling air flows along the inclined surface of each baffle plate 6 to the lead rod 3 or the lead wire. The air is guided toward the air, and the flow velocity is increased through the gap K formed between the lead rods 3 or the lead wires, so that the lead rods 3 or the lead wires can be effectively cooled.

As described above, also in FIG. 14, as described above, the air guide plate 6 and the lead rod 3 or the lead wire may be arranged so that there is no gap K therebetween.

The air guide plate 6 according to the seventh to twelfth embodiments has a portion 61 whose cross-sectional shape faces the lead rod 3.
Although the case where the block-shaped baffle plate having an acute angle is used has been described, the facing portion 61 is not limited to an acute angle, and a part having an angle of at least 180 degrees is also applicable. It is not limited to the baffle plate, and it is also possible to use a plate-shaped body having a substantially "V" shape.

As described above, also in the inventions of the fourth to twelfth embodiments, the lead rod 3 can be cooled without applying any load to the sealing portion between the step glass 4 and the lead rod 3. Since the lead rod 3 can be effectively cooled and the sealing portion 41 of the stepped glass 4 can be effectively cooled accordingly, the distance between the electrode 2 and the sealing portion 41 can be shortened. As a result, the lamp length can be shortened, and 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.

The present invention is for efficiently cooling the external lead rod and the lead wire connected to the external lead rod, and as described above, the external lead rod is sealed by the step glass. Although the short arc type discharge lamp has been described, it is also applicable to a short arc type discharge lamp having a structure in which an external lead rod is connected to a metal foil and the metal foil is pressure-bonded and sealed. in this case,
It is possible to cool the external lead rod protruding from the crimp-sealing to the outside or the lead wire connected to the external lead rod.

[0050]

According to the first and third aspects of the present invention, the lead rod or the lead wire is provided with a gap in the inner space of the die formed outside the step glass through which the lead rod penetrates. Since a baffle plate is provided for guiding the cooling air introduced from the ventilation port to the gap, the sealing part can be mounted without applying any load to the sealing part between the step glass and the lead rod. Can be cooled. As a result, the distance between the electrode and the sealing part can be shortened to shorten the lamp length, which enables downsizing and higher output of the lamp, and even when the lamp is not downsized, cooling is possible. It is possible to reduce the size of the cooling device that supplies air and to make the cooling fan quiet.

According to the second and third aspects of the invention, the lead rod or the lead wire is provided with a gap in the space formed outside the step glass through which the lead rod penetrates. Since the air guide plate for guiding the generated cooling air to the gap is provided, the sealing portion can be cooled without applying any load to the sealing portion between the step glass and the lead rod. As a result, the distance between the electrode and the sealing part can be shortened to shorten the lamp length, which enables downsizing and higher output of the lamp, and even when the lamp is not downsized, cooling is possible. It is possible to reduce the size of the cooling device that sends air and to make the cooling fan quieter.

According to the fourth aspect of the invention, the baffle plate is
Since a plurality of lead rods are arranged radially, in addition to the effects of the invention described in claims 1 and 2, the lead rod or the lead wire connected to the lead rod can be cooled more reliably, and It is possible to further cool the sealed portion.

[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 a diagram showing a positional relationship between a lead rod and four baffle plates at a ventilation port when viewed in the axial direction of the short arc type discharge lamp shown in FIG.

FIG. 3 is a diagram showing an example of a projection device such as a projector using the short arc type discharge lamp shown in FIG.

FIG. 4 shows a positional relationship between a lead rod and a baffle plate provided with one baffle plate at a ventilation port as viewed from the axial direction of a short arc type discharge lamp according to a second embodiment of the present invention. It is a figure.

FIG. 5 shows a positional relationship between a lead rod and a baffle plate provided with two baffle plates at a ventilation port as viewed from the axial direction of a short arc type discharge lamp according to a third embodiment of the present invention. It is a figure.

FIG. 6 is a perspective view showing a positional relationship between a lead rod and four baffle plates in a short arc type discharge lamp according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view showing a positional relationship between a lead rod and one baffle plate in a short arc discharge lamp according to a fifth embodiment of the present invention.

FIG. 8 is a perspective view showing a positional relationship between a lead rod and two baffle plates in a short arc type discharge lamp according to a sixth embodiment of the present invention.

FIG. 9 is a perspective view showing a positional relationship between a lead rod and three baffle plates in a short arc type discharge lamp according to a seventh embodiment of the present invention.

FIG. 10 is a perspective view showing a positional relationship between a lead rod and one baffle plate in a short arc type discharge lamp according to an eighth embodiment of the present invention.

FIG. 11 is a perspective view showing a positional relationship between a lead rod and two baffle plates in a short arc type discharge lamp according to a ninth embodiment of the present invention.

FIG. 12 is a perspective view showing a positional relationship between a lead rod and three baffle plates in a short arc type discharge lamp according to a tenth embodiment of the present invention.

FIG. 13 is a perspective view showing a positional relationship between a lead rod and one baffle plate in a short arc type discharge lamp according to an eleventh embodiment of the present invention.

FIG. 14 is a perspective view showing a positional relationship between a lead rod and two baffle plates in a short arc type discharge lamp according to a twelfth embodiment of the present invention.

FIG. 15 is a cross-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 4 step glass 41 Sealing part 5 mouthpiece 51 Inflow side ventilation port 52 Outflow side ventilation port 6 baffle 61 The part of the baffle plate facing the lead rod K gap

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 21/16 H01J 61/36 B H01J 61/073 F21Y 101: 00 61/36 F21M 1/00 A // F21Y 101: 00 7/00 K F term (reference) 3K014 LA01 LB03 LB04 MA02 MA05 3K042 AA01 AC06 BA08 BA10 BB12 CC04 5C015 JJ06 5C039 AA02 5C043 AA12 CC05 DD11

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 internal space of the base formed outside the stepped glass through which the lead rod penetrates, a gap is provided from the lead rod or the lead wire connected to the lead rod. A short arc discharge lamp, characterized in that it is provided with a baffle plate which is provided via the air duct to guide the cooling air introduced from the ventilation port to the gap. 2. A short arc discharge lamp in which 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, wherein the step through which the lead rod penetrates. In the space formed outside the glazing, there was provided a baffle plate which was provided through the gap from the lead rod or the lead wire connected to the lead rod and which guides the introduced cooling air to the gap. A short arc type discharge lamp characterized by the above. 3. The air guide plate is formed such that a portion of the air guide plate facing the lead rod or the lead wire has an angle within 180 degrees. The short arc type discharge lamp according to claim 2. 4. The plurality of baffle plates are arranged in a radial direction from the lead rod.
A short arc type discharge lamp according to any one of claims 1 to 3.