TWI601183B - Discharge lamp - Google Patents

Description

Discharge lamp

The present invention relates to a discharge lamp used in an exposure apparatus or the like, and more particularly to an electrode in which a heat transfer body is sealed inside an electrode.

In the discharge lamp tube, a metal having a cooling function is sealed in a sealed space formed inside the electrode in accordance with the high output (see Patent Document 1). For example, a heat transfer body formed of a metal having a high thermal conductivity and a relatively low melting point such as silver is sealed inside the anode. When the electrode temperature rises due to the discharge lamp being lit, the heat transfer body is melted and liquefied. Thereby, heat convection is generated in the sealed space, and the heat at the tip end portion of the electrode is directed toward the opposite side of the electrode support rod.

When the lamp is turned on to convect the heat transfer body, a severe temperature difference occurs in the sealed space inside the electrode, and high temperature creep deformation may occur. In order to prevent this, the plate-shaped gauge body that is transverse to the radial direction is disposed through the center of the sealed space, that is, through the electrode shaft, and the heat transfer body is prevented from rotating in the circumferential direction (see Patent Document 2).

[Patent Document 1] JP-A-2004-006246

[Patent Document 2] JP-A-2012-028168

When the gauge body that traverses the sealed space is provided, the flow of the heat transfer body to be raised is hindered at the center portion passing through the electrode shaft. This point reduces the heat transfer capability transmitted to the tip end side of the electrode, and does not suppress the consumption at the tip end portion of the electrode due to the temperature rise of the tip end of the electrode.

Therefore, it is necessary to improve the heat transfer capability without hindering the convection of the heat transfer body.

The discharge lamp tube of the present invention comprises a discharge tube and a pair of electrodes disposed in the discharge tube, at least one of the electrodes has a sealed space, and the sealed space is sealed with a heat transfer body that melts and convects when the light is turned on; The electrode shaft is disposed in the sealed space and has a hollow commutator having a closed space bottom side opening and a sealed space upper side opening. Thereby, a flow path of the heat transfer body is formed between the opening portion on the bottom surface side of the sealed space and the opening on the upper surface side of the sealed space. Further, the rectifying body is disposed in a state in which the electrode shaft passes through the flow path. The entire fluid is composed of, for example, a tubular body and is disposed in a sealed space formed in the anode. Here, the cross section of the tubular body may be a circular shape or a polygonal shape.

When the lamp is turned on, the heat transfer body heated at the center portion near the bottom surface of the sealed space passes through the flow path and rises. Then, by heat convection, most of the heat transfer body in the vicinity of the upper surface of the sealed space moves to a space/gap between the inner side surface of the sealed space and the outer surface of the rectifying space, and descends along the electrode axis. By forming such a flow, it is possible to suppress the occurrence of flow in the radial direction and promote the heat convection.

The structure in which the upward flow of the heat transfer body along the electrode axis can be promoted can be, for example, the open space on the bottom surface side of the closed space of the flow regulating body and the closed space The front side opening portions are respectively directed to the bottom surface and the upper surface of the sealed space. Further, in order to sufficiently cover the flow in the radial direction of the sealed space, the flow regulating body can be disposed at the center portion. For example, the opening of the bottom surface side of the closed space of the flow regulating body is located on the bottom surface side with respect to the center of the electrode axis along the sealed space, and the opening of the upper surface side of the sealed space of the flow regulating body with respect to the center of the electrode axis along the sealed space. Located on the upper side, the rectifying body is constructed as such.

The electrode tip end portion is included, and the cross-sectional shape is symmetrical with respect to the electrode axis, and the sealed space is also coaxially arranged. If it is considered that the heat transfer body is most heated near the tip end portion of the electrode, the rectifier can be coaxially arranged with respect to the sealed space. Here, the term “coaxial” means that the axis of the closed space passes through the center of gravity of the cross section perpendicular to the axial direction of the rectifying body or a vicinity thereof.

If it is considered to prevent local turbulence caused by thermal convection, it is preferable that the inner space region forming the flow channel and the outer space region thereof should be symmetric with respect to the vertical cross section of the electrode axis, and the distance between the outer surface of the rectifying outer surface and the side of the confined space along the radial direction is It is better to be equal across the entire circumference. For example, a rectifying body having a circular cross section may be coaxially disposed in a cylindrical inner space.

Further, the commutator may be placed at a symmetrical position with respect to the electrode axis to smooth the heat convection. For example, in the center position of the internal space in the direction of the electrode axis, the rectifying body is placed along the center position in the direction of the electrode axis of the rectifying body, whereby the bottom surface side opening portion of the sealed space and the bottom surface of the sealed space are along the electrode axis direction. The distance may be equal to the distance between the upper opening portion of the closed space and the upper surface of the sealed space along the direction of the electrode axis.

Considering the arrangement position of the rectifier in the radial direction affects the generation of heat convection, and the arrangement of the rectifier can satisfy the following formula.

0.33≦L1/a≦0.84

In the formula, L1 represents the distance from the electrode axis to the rectifier, and a represents the radius inside the sealed space. By satisfying such conditions, heat convection can be effectively generated. In particular, the heat transfer effect can be further exerted by satisfying the configuration of the following conditional expression.

0.66≦L1/a≦0.74

On the other hand, when considering the position of the rectifying body along the direction of the electrode axis, the arrangement of the rectifying body can be made to satisfy the following formula.

0.50≦L2/b≦0.84

In the formula, L2 represents the length of the commutator, and b represents the length of the closed space along the axial direction. In this way, the class exerts a heat transfer effect.

In consideration of the smooth decline of the heat transfer body after the rise, the flow regulating device can be provided with an outflow port formed along the circumferential direction of the side surface of the sealed space in the vicinity of the upper surface of the sealed space. Further, in consideration of moving the heat of the rising heat transfer body to the side surface of the electrode, a slit along the electrode axis can be formed on the flow regulating body.

After the lamp is turned off, the heat transfer body preferably has a solidification effect in a state in which the height in the direction of the electrode axis of the inner region of the rectifying body is lower than the outer region of the rectifying body.

According to the present invention, an electrode in which a heat transfer body is sealed which improves heat transfer capability can be obtained.

10‧‧‧discharge lamp

12‧‧‧Discharge tube

13A, 13B‧‧‧Blocking tube

15A, 15B‧‧‧Guide bars

16A, 16B‧‧‧metal foil

17A, 17B‧‧‧electrode support rod

19A, 19B‧‧‧ lamp holder

20‧‧‧ cathode

30‧‧‧Anode

30S‧‧‧ electrode tip

32‧‧‧Flanged apex

34‧‧‧ Body Department

40,140,240,340‧‧‧Refer

40S, 340R‧‧‧ body

41A, 41B‧‧‧ openings

50‧‧‧Confined space

50B‧‧‧Bottom of confined space

50S‧‧‧Seal space side

50T‧‧‧Confined space above

60‧‧‧Closed cover

140R‧‧‧ hole

240A, 240B‧‧‧Bend

DS‧‧‧discharge space

M‧‧‧ heat transfer body

ST‧‧‧slit

V1‧‧‧ inside area

V2‧‧‧Outer area

W‧‧‧electrode axis direction center

Fig. 1 is a plan view showing a discharge lamp of a first embodiment in a mode.

Fig. 2 is a schematic cross-sectional view of the anode.

Figure 3 is a perspective view of the rectifier.

Fig. 4 is a view showing convection of a heat transfer body.

Fig. 5 is a schematic cross-sectional view showing the anode in a state in which the heat transfer body is solidified.

Fig. 6 is a perspective view of the flow regulating body in the second embodiment.

Fig. 7 is a perspective view of the flow regulating body in the third embodiment.

Fig. 8 is a perspective view of the flow regulating body in the fourth embodiment.

Figure 9 is a graph of the change in electrode tip temperature and maximum flow rate versus L1/a.

Figure 10 is a graph of the change in electrode tip temperature and maximum flow rate versus L2/b.

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a plan view showing a discharge lamp of a first embodiment in a mode.

The short arc type discharge lamp tube 10 is a discharge lamp tube which can be used as a light source for forming an exposure device (not shown), and includes a discharge tube (light emitting tube) 12 made of transparent quartz glass. In the discharge tube 12, the cathode 20 and the anode 30 are arranged to face each other at a predetermined interval.

On both sides of the discharge tube 12, in the opposing state, the sealing tubes 13A, 13B made of quartz glass are integrally provided with the discharge tube 12, and both ends of the sealing tubes 13A, 13B are plugged by the bases 19A, 19B.

The discharge tube 10 has the anode 30 on the upper side and the cathode 20 on the lower side in the vertical direction. Inside the sealing tubes 13A, 13B, conductive electrode support rods 17A, 17B supporting the metallic cathode 20 and the anode 30 are disposed. Metal foils 16A and 16B such as a metal ring (not shown) and molybdenum are connected to the conductive bars 15A and 15B, respectively.

The sealing tubes 13A, 13B are dissolved in a glass tube (not shown) provided in the sealing tubes 13A, 13B, whereby the discharge space DS in which mercury and rare gas are sealed is sealed.

The guide bars 15A, 15B are connected to an external power supply unit (not shown), and a voltage is applied between the cathode 20 and the anode 30 through the guide bars 15A, 15B, the metal foils 16A, 16B, and the electrode support bars 17A, 17B. When electric power is supplied to the discharge lamp tube 10, an arc discharge is generated between the electrodes, and ultraviolet rays generated by mercury are emitted.

Fig. 2 is a schematic cross-sectional view of the anode. Figure 3 is a perspective view of the rectifier.

As shown in Fig. 2, the anode 30 is composed of a cylindrical main body portion 34 and a truncated cone-shaped tip end portion 32 having an electrode tip end portion 30S. The main body portion 34 is joined to the sealing cover 60. The sealing cover 60 is provided with an electrode support rod 17B. The main body portion and the tip end portion except the sealing cover 60 are formed of the same metal material.

In the main body portion 34, a cylindrical sealed space 50 is formed coaxially with respect to the electrode axis E at the inner center. In the sealed space 50, the upper limit is the upper surface 50T of the sealed space that is connected to the sealing cover 60 on the side of the electrode support rod, and the lower limit is located on the bottom surface 50B of the sealed space on the side of the first end face of the electrode.

The sealed space 50 is sealed by a heat transfer body M. The heat transfer body M is made of a metal (for example, silver) having a lower melting point than the main body portion 34 and the sealing cover 60. When the lamp is turned on, it is melted into a liquid and convected in the sealed space 50. When the lamp is turned off, the heat transfer body M is solidified.

Furthermore, in the closed space 50, the tubular rectifying body 40 is relatively The closed space 50 is coaxially disposed, and the central axis of the rectifier 40 coincides with the electrode axis E. The entire fluid 40 has a radius L1 and a length L2 along the electrode axis E.

The entire fluid 40 is disposed at a distance 12 from the bottom surface 50B of the sealed space along the direction of the electrode axis, and is disposed at a distance 13 from the upper surface 50T of the sealed space, and is disposed in the sealed space 50. The rectifier 40 can be configured by making the distances 12, 13 equal. On the other hand, the flow regulating body 40 is spaced apart from the closed space side surface 50S by a distance 11 along the radial direction, and the distance between the flow regulating body 40 and the closed space side surface 50S is equal to the entire circumferential direction.

As shown in Fig. 3, the entire fluid 40 is composed of a pipe body 40S. The pipe body 40S is formed with an opening portion 41A which serves as an inflow port on the bottom surface side of the sealed space, and an opening portion 41B which serves as an outflow port on the upper surface side of the sealed space. The tube body 40S is here a cross-sectional circular shape. Further, the tubular body 40S is fixed by a rod-shaped or plate-shaped fixing member (not shown). If the fixing member has a plate shape, it is provided along the electrode axis.

The openings 41A and 41B of the tubular body 40S are respectively directed toward the closed space bottom surface 50B and the sealed space upper surface 50T. Moreover, the pipe body 40S is disposed in the center portion of the sealed space 50 with respect to the electrode axis, and the opening portion 41A is located on the bottom surface side with respect to the center W of the sealed space 50 in the electrode axis direction, and the center of the opening portion 41B with respect to the electrode axis direction W , located on the upper side.

The tubular body 40S is in the sealed space 50, and is defined as a spatial region V1 of the conduit of the tubular body 40S and a spatial region V2 outside thereof, and the two spatial regions are separated. The tube body 40S is formed using a high melting point metal such as tungsten, tantalum or the like and an alloy thereof.

Fig. 4 is a view showing convection of a heat transfer body. Here, the heat transfer effect of the rectifying body will be described using Fig. 4 .

When the lamp is lit, due to the temperature of the arc discharge electrode tip end portion 32 The degree becomes a high temperature, and the molten heat transfer body M rises along the electrode axis E. In particular, the heat transfer body M rises in the central portion of the sealed space 50 centering on the electrode axis E due to the arc heat of the electrode front end surface 30S. As a result, the heat transfer body M flows into the opening portion 41A of the flow regulating body 40, and moves in the inner passage of the pipe.

The heat transfer body M that has risen inside the reformer 40 largely moves along the closed space upper surface 50T, and after the heat is transferred to the side of the electrode support rod, the outer side region V2 of the flow regulating body 40 is lowered. At this time, the heat transfer body M is released while the heat is released to the outer side surface 34S of the main body portion 34. Then, the heat transfer body M that has reached the vicinity of the peripheral edge portion of the closed space bottom surface 50B moves to the center portion thereof, and then rises inside the rectifying body 40 by the arc heat.

The convection of such a heat transfer body M can be promoted by the configuration of the rectifier 40. In other words, by providing the tubular body 40S coaxially, the flow in the upper direction in the inner region V1 of the flow regulating body 40 and the flow in the downward direction of the outer region V2 are mutually blocked, so that it is less likely to cause stagnation, and convection can be promoted. Since the convection in the vertical direction of the heat transfer body M is not hindered, the flow velocity and flow rate when the heat transfer body M rises are increased.

In the structure in which the flow regulating body is not provided, the heat transfer body M is pressed by the heat transfer body M in the vicinity of the center portion due to the influence of a large amount of downward flow in the vicinity of the side surface of the sealed space, and the upward flow rate is reduced. The flow rate is not fast.

However, in the present embodiment, the flow velocity of the heat transfer body M, particularly the flow velocity of the upward flow, is increased by the arrangement of the rectifying body 40, and the flow rate thereof is increased, whereby the heat on the front end side of the electrode can be excellent in efficiency. The transfer to the electrode support rod side suppresses the temperature rise of the electrode tip end portion 32. As a result, the consumption of the tip end portion 32 of the electrode can be suppressed. In particular, the rectifier 40 has a sufficiently long length along the direction of the electrode axis Further, since it is located at the center portion, almost the entire partition in the sealed space 50 is a pipe and an outer space region thereof, so that the flow passage can be sufficiently ensured.

Further, the flow regulating body 40 can block the movement of heat along the radial direction of the sealed space 50, whereby the generated stress can be reduced in the sealed space 50 when the heat transfer body M is solidified. This is explained below.

Fig. 5 is a schematic cross-sectional view showing the anode in a state in which the heat transfer body is solidified.

Since the heat exchanger of the inner region V1 is difficult to be transferred to the outer region V2, the temperature of the heat transfer body M in the inner region V1 is slowly lowered, and the outer region V2 is relatively solidified earlier. As a result, as shown in Fig. 5, the heat transfer body M in the outer region V2 is first solidified and contracted, and the heat transfer body M in the inner region V1 is lower than the heat transfer body M in the outer region V2 in a state where the liquid level thereof is lowered more. solidification.

As a result, a concave portion having an appropriate depth is formed on the heat-transfer body M which has been solidified and contracted. Thereafter, when the lamp is turned on again, the heat transfer body M is thermally expanded, and stress is generated on the bottom surface 50B of the sealed space and the side surface 50S of the sealed space. However, due to the formation of the recess, the stress is released to the center portion, so that the stress can be reduced. Thus, when the lamp is turned on, the electrode tip end portion 32 is not blown.

Further, since the heat transfer body of the inner region V1 is solidified in a state where the liquid surface is lowered, the heat transfer body of the inner region V1 is melted earlier and starts convection, so that the time required for the entire heat transfer body to melt is shortened. As a result, it is possible to prevent the electrode tip end portion 32 from being consumed when the lamp is turned on.

In the present embodiment, in order to satisfy the following formula, the size of the rectifying body 40 is determined, and the arrangement position along the radial direction is also determined.

0.33≦L1/a≦0.84 (1)

In this formula, the radius of the rectifying body 40 along the electrode radial direction is L1, and the inner radius of the sealed space 50 is a.

When L1/a is less than 0.33, the inner diameter of the rectifying body 40 is relatively too small, which hinders the upward flow of the heat transfer body M. On the other hand, when L1/a is larger than 0.84, the downward flow of the heat transfer body M inside the rectifying body 40 is generated much, preventing the upward flow.

Furthermore, when the range of the following formula is satisfied, it has a great effect on increasing upward convection.

0.66≦L1/a≦0.74 (2)

On the other hand, L2 of the rectifying body has an effect of increasing the flow velocity of the heat transfer body by satisfying the following formula.

0.50≦L2/b≦0.84 (3)

In this formula, the length of the rectifying body along the axial direction is L2, and the length of the confined space along the axial direction is b.

If the length of the entire fluid in the direction of the electrode axis is smaller than the range of the above formula, the upper and lower convection cannot be sufficiently blocked (blocked). Moreover, if it is larger than the range of the above formula, the flow in the radial direction of the electrode is inhibited.

As described above, according to the present embodiment, in the discharge lamp tube 10, the sealed space 50 is formed in the anode 30, and the heat transfer body M is sealed in the sealed space 50. Then, in the sealed space 50, the tubular rectifying body 40 having a circular cross section is disposed coaxially with the sealed space side surface 50S, the sealed space upper surface 50T, and the sealed space bottom surface 50B at a distance of 11, 13, and 12.

Next, the electrodes of the second and third embodiments will be described using Figs. 6 and 7. In the second embodiment, a hole is formed in the commutator. The structure other than this is substantially the same as that of the first embodiment.

Fig. 6 is a perspective view of the flow regulating body in the second embodiment.

In the vicinity of the upper surface of the sealed space of the flow regulating body 140, that is, at a position on the upper surface side along the center of the electrode axis along the sealed space, a plurality of holes 140R are formed at predetermined intervals along the circumferential direction. Thereby, the rising heat transfer body M flows out to the outer side region V2 through the hole 140R. As a result, the convection of the heat transfer body M is promoted, and the heat is easily moved.

Further, since the hole 140R is formed, the depth of the concave portion is not excessively deep when the heat transfer body M after the lamp is turned off is solidified. The reason for this is that there is no large temperature difference between the center portion and the side surface along the radial direction, so that when the lamp is turned off, it does not rapidly solidify only near the side surface of the sealed space.

When the concave portion is too high, the bottom of the concave portion is close to the bottom surface of the closed space, and when solidified, a strong stress acts on the bottom surface. However, since the hole 140R is formed, the recess is not too high and has an appropriate height, and even if the lamp is turned on and off, the stress generated in the sealed space can be reduced.

Further, since the flow path of the heat transfer body can be secured by the hole 140R, the upper portion of the flow regulating body can be directly dissolved and fixed to the sealing cover 60. Thereby, the electrode can be formed without using a member for fixing the rectifier.

Next, the third embodiment will be described using Fig. 7 . In the third embodiment, a slit is formed in the commutator. The structure other than this is the same as that of the first embodiment.

Fig. 7 is a perspective view of the flow regulating body in the third embodiment.

In the flow regulating body 240, the curved portions 240A and 240B having a semicircular cross section are disposed to face each other, and a slit ST is formed between the curved portions 240A and 240B. In other words, the rectifier 240 is equivalent to dividing the pipe body shown in the first embodiment into Two configurations configured in such a manner as to create a gap. By forming the slit ST in this manner, as in the second embodiment, the movement of heat is facilitated, and the concave portion has an appropriate height. In addition, it may be a configuration in which the number of slits is larger.

Next, a discharge lamp of a fourth embodiment will be described using Fig. 8 . In the fourth embodiment, the cross-sectional shape of the tubular body is polygonal.

Fig. 8 is a perspective view of the flow regulating body in the fourth embodiment.

The entire fluid 340 is composed of a tubular body 340R having a triangular cross section, and one side of the tubular body 340R at least along the direction of the electrode axis is fixed to the side surface of the sealed space. Thus, since the cross section is a triangle, the rectifier is easily fixed. Further, the cross-sectional shape may be a polygon other than a triangle.

The installation structure of the rectifier may be fixed to one of the upper surface of the sealed space or the ground, or may be a structure provided on both sides. In this case, since the inflow port and the outflow port of the heat transfer body are formed in the upper portion of the flow regulating body, heat convection can be promoted.

The entire fluid is disposed coaxially with respect to the sealed space and has a symmetrical arrangement structure. However, the fluid may be disposed at a predetermined distance from the electrode axis E in the radial direction, or the rectifier may be disposed by passing the electrode shaft through the tube. And the inner side area inside the tube and the outer side area outside the tube are regulated, thus forming a rectifying body.

The rectifying body may be a structure other than the pipe body, and may be a tubular body having a wall thickness and a hollow shape, or a hollow member having a flow path formed along the electrode axis, or a plurality of flows inside. The state in which the Tao is regulated and formed. Further, a rectifying body may be provided at the cathode or a rectifying body may be provided on both electrodes in accordance with the state in which the discharge lamp is placed.

[Examples]

The embodiment will be described below using Figs. 9 and 10. Here, the position and shape of the rectifying body according to the above formulas (1) to (3) are verified by simulation, and it is seen how the temperature at the tip end portion of the electrode and the maximum flow velocity of the heat transfer body are affected.

The rectifying body having a circular cross section is disposed coaxially with the closed space having a circular cross section, and the rectifying body is disposed so that the distance between the upper surface and the bottom surface of the sealed space is equal, and the discharge lamp tube in which the heat transfer body is sealed in the sealed space is set. The diameter of the closed space (diameter inside the closed space = 2a) is 30 mm, the diameter of the anode (outer diameter of the electrode) is 40 mm, and the thickness of the tip end side (the distance between the bottom surface of the sealed space and the electrode axis of the electrode tip end face) is 10 mm, and the cylindrical portion The thickness of the sealed space is 5 mm, and the height of the sealed space (b) is 35 mm. The anode is modularized, and a simulation of the tip end temperature and the maximum flow rate is performed using a computer based on the assumption that the electric power is 14 kW of heat.

At this time, the electrode tip end temperature and the maximum flow velocity were calculated while changing the ratio L1/a of the distance L1 from the electrode axis to the electrode in the electrode radial direction and the radius a (=15 mm) inside the sealed space. In the formula, the maximum flow velocity represents the maximum flow velocity of the heat transfer body that rises along the electrode axis.

Figure 9 is a graph of the change in electrode tip temperature and maximum flow rate versus L1/a.

As shown in Fig. 9, the maximum flow velocity starts to become larger near L1/a = 0.33 than in the case where there is no rectifier, and is near 0.84. The range of this L1/a is identical to the range of the above formula (1). In particular, the range in which the maximum flow velocity is maintained at the high level is equivalent to 0.66 to 0.74 as shown in the above formula (2). From this, it is understood that the electrode having the sealed space satisfying the above formulas (1) and (2) exhibits an excellent heat transfer effect.

Further, while changing the length L2 and the density of the electrode axis direction of the rectifier The temperature at the tip end of the electrode and the maximum flow rate were calculated while the ratio L2/b of the axial length b (= 30 mm) of the closed space was calculated. In the formula, the distance between the rectifier and the bottom surface of the sealed space is set to be equal to the distance between the rectifier and the closed space.

Figure 10 is a graph of the change in electrode tip temperature and maximum flow rate versus L2/b.

As shown in Fig. 10, the maximum flow velocity starts to become larger near L2/b = 0.50 than in the case where there is no rectifier, and is near 0.84. The range of this L2/b is identical to the range of the above formula (3). From this, it is understood that the electrode having the sealed space satisfying the above formula (3) exhibits an excellent heat transfer effect.

17B‧‧‧electrode support rod

30‧‧‧Anode

30S‧‧‧ electrode tip

32‧‧‧Flanged apex

34‧‧‧ Body Department

34S‧‧‧The outer side of the body part

40‧‧‧Refer

50‧‧‧Confined space

50B‧‧‧Bottom of confined space

50S‧‧‧Seal space side

50T‧‧‧Confined space above

60‧‧‧Closed cover

M‧‧‧ heat transfer body

W‧‧‧electrode axis direction center

Claims (10)

A discharge lamp tube comprising: a discharge tube; and a pair of electrodes disposed in the discharge tube; wherein at least one of the electrodes has a sealed space enclosing a heat transfer body that melts and convects when illuminated; And a rectifying body that is hollow and disposed in the sealed space along the electrode axis, and has a closed space bottom side opening and a sealed space upper side opening; and the rectifying body is disposed at the bottom surface side opening of the sealed space A flow path through which the electrode shaft passes is formed between the opening on the upper surface side of the sealed space, and the rectifying body is disposed in the sealed space in a coaxial state. The discharge lamp tube according to the first aspect of the invention, wherein the closed space bottom side opening portion of the rectifying body and the upper surface side opening portion of the sealed space face the bottom surface and the upper surface of the sealed space, respectively. The discharge lamp of the first aspect of the invention, wherein the opening of the bottom surface side of the sealed space of the rectifying body is located on the bottom surface side with respect to the center of the electrode axis along the sealed space, and the upper side of the sealed space of the rectifying body is open. The portion is located on the upper side with respect to the center of the electrode axis along the sealed space. The discharge lamp of claim 1, wherein the outer surface of the rectifying body and the side surface of the sealed space cross the entire circumferential direction at an equal distance along the radial direction. The discharge lamp according to any one of the first to third aspect, wherein the bottom surface side opening portion of the sealed space and the bottom surface of the sealed space are electrically connected The distance in the polar axis direction is equivalent to the distance between the upper opening portion of the sealed space and the upper surface of the sealed space along the direction of the electrode axis. The discharge lamp of claim 5, wherein the arrangement of the rectifier conforms to the following formula: 0.33 ≦ L1/a ≦ 0.84. In the formula, L1 represents a distance from the electrode shaft to the rectifier, and a represents a closed space. The radius of the inside. The discharge lamp of claim 6, wherein the arrangement of the above-mentioned rectifiers satisfies the following formula: 0.66 ≦ L1/a ≦ 0.74. The discharge lamp of claim 5, wherein the arrangement of the rectifying body satisfies the following formula: 0.50 ≦ L2 / b ≦ 0.84. In the formula, L2 represents the length of the rectifying body, and b represents the confined space along the axial direction. length. The discharge lamp according to any one of claims 1 to 3, wherein the rectifying body has an outflow port formed along a circumferential direction of a side surface of the sealed space in the vicinity of the upper surface of the sealed space. The discharge lamp according to any one of claims 1 to 3, wherein the heat transfer body has a height in an electrode axis direction of an inner region of the rectifying body lower than an outer side region of the rectifying body after the lamp is turned off. In the state of the state, solidification occurs.