JPWO2009008473A1 - Light source device and arc tube - Google Patents

Abstract

It is an object to improve the cooling efficiency for the arc tube as much as possible while avoiding an increase in apparatus cost. The arc tube (1) provided with external connection electrodes (EO) at both ends in the longitudinal direction and the arc tube (1) formed in a substantially cylindrical shape and disposed in a non-contact state in the internal space are cooled. In the light source device provided with a cooling member (CM), the arc tube (1) has a gap between the upper end of the arc tube (1) and the inner wall of the cooling member (CM) in the internal space. The existence position is set to be shorter than the distance between the lower end of the arc tube (1) and the inner wall of the cooling member (CM).

Description

  The present invention includes an arc tube having external connection electrodes at both ends in the longitudinal direction, and a cooling member that is formed in a substantially cylindrical shape and cools the arc tube arranged in a non-contact state in the internal space. The present invention relates to a light source device provided and an arc tube suitable for use in the light source device.

Such a light source device is a device for irradiating various processing objects with light emitted from an arc tube such as an ultraviolet lamp to perform a predetermined process such as resin curing.
Since such a light source device has a high temperature during the lighting operation, the light source device is provided with means for cooling to suppress an excessive temperature rise of the arc tube.
As a configuration of this cooling means, for example, as described in Patent Document 1 below, it is considered to arrange a cooling member such as a water cooling jacket in a state surrounding the periphery of the arc tube.
The water cooling jacket of the following Patent Document 1 is composed of a double tube made of quartz to transmit light emitted from the arc tube, and cooling water is supplied to the space between the inner tube and the outer tube of the double tube. It is configured to flow.
Conventionally, the arrangement form of the arc tube in the inner space of the water-cooling jacket matches the central axis of the inner space (center axis of the inner tube) with the central axis of the arc tube from the idea that the arc tube is cooled uniformly. It was made the structure arrange | positioned in the center position of internal space.
JP 2004-39511 A

However, with the recent increase in the output of the arc tube, if the arc tube is arranged as in the conventional configuration, the cooling efficiency for the arc tube may be insufficient.
The present invention has been made in view of such circumstances, and an object thereof is to improve the cooling efficiency of the arc tube as much as possible while avoiding an increase in apparatus cost.

  The first invention of the present application cools the arc tube provided with external connection electrodes at both ends in the longitudinal direction, and the arc tube formed in a substantially cylindrical shape and disposed in a non-contact state in the internal space. In the light source device provided with the cooling member, the arc tube has an interval between the upper end of the arc tube and the inner wall of the cooling member in the internal space, the lower end of the arc tube and the cooling member. The existence position is set so as to be shorter than the distance from the inner wall.

That is, the heat generation from the arc tube increases as the output of the arc tube increases. The heat radiated from the arc tube does not spread evenly in the internal space of the cooling member surrounding the arc tube, but remains above the arc tube due to the influence of gravity. As a result, the heat distribution is uneven within the internal space.
For this reason, if the arc tube is arranged in the center of the internal space of the cooling member, the cooling effect on the upper portion of the arc tube will be insufficient.
Therefore, the arc tube is arranged in the internal space of the cooling member so that the interval between the upper end of the arc tube and the inner wall of the cooling member is shorter than the interval between the lower end of the arc tube and the inner wall of the cooling member. is doing. In other words, the arc tube is arranged so as to be biased upward in the internal space of the cooling member.
The upper end, the lower end, the upper side, and the lower side mean the direction of gravity, that is, the upper and lower sides in the vertical direction.

With this arrangement, the upper end of the arc tube comes closer to the inner wall of the cooling member, and the cooling action from the inner wall of the cooling member becomes stronger.
In addition, when the heat generation from the arc tube becomes extremely large, the arc tube may be bent downward by the heat.
When the arc tube is bent downward in this way, if the lower end side of the arc tube comes into contact with the inner wall of the cooling member, the contact point in the arc tube is overcooled and the normal lighting state cannot be maintained. End up. Therefore, by arranging the arc tube as described above and making the distance between the lower end side of the arc tube and the inner wall of the cooling member relatively long, even if the arc tube is curved, it contacts the inner wall of the cooling member. Can be avoided.

According to a second invention of the present application, in addition to the configuration of the first invention, the arc tube is a straight tube arc tube.
Since the straight tube-shaped arc tube is susceptible to the above-described heat problems and problems such as arc tube bending are likely to occur, it is particularly useful to arrange the arc tube as described above.

  According to a third invention of the present application, in addition to the configuration of the first or second invention, the cooling member is formed so that the internal space has a substantially cylindrical shape. The location of the external connection electrode is supported by a support member that fits inside the inner wall of the cooling member, and the support member has a gap with the inner wall of the cooling member as viewed in the longitudinal direction. In the longitudinal direction, the support position of the arc tube in the support member is set closer to the upper side of the internal space of the cooling member, and the cooling member includes at least one of the support members. Cooling air that cools the arc tube by providing a clearance path between the support member and the inner wall of the cooling member. Provided with cooling air generating means for generating It has been.

That is, in the case where the internal space has a substantially cylindrical shape, as a configuration for biasing the position of the arc tube in the internal space upward, the support member in the support member that supports the location of the external connection electrode This is realized with a simple configuration in which the support position of the arc tube is shifted to the upper side.
In addition, by utilizing the fact that a gap is formed between the edge of the support member and the inner wall of the cooling member, a cooling air passage for cooling the arc tube is provided.
Furthermore, it is possible to configure a detent member that prevents the support member from rotating within the internal space of the cooling member with a simple configuration that contacts at least one part of the support member, and makes the arc tube in an appropriate posture. Can be maintained.

  According to a fourth invention of the present application, in addition to the configuration of the first or second invention, the cooling member is formed so that the internal space has a substantially cylindrical shape. The location of the external connection electrode is supported by a support member fitted in the inner wall of the cooling member, and the support member is formed in a polygonal shape as viewed in the longitudinal direction. The support position of the arc tube in the support member is set to be higher than the center of the circumscribed circle of the support member, and the cooling member is in contact with at least one side of the polygonal support member. Accordingly, an anti-rotation member for preventing the support member from rotating is provided, and cooling air for cooling the arc tube is generated using a gap between the support member and the inner wall of the cooling member as a ventilation path. Cooling air generation means is provided

That is, in the case where the internal space has a substantially cylindrical shape, as a configuration for biasing the position of the arc tube in the internal space upward, the support member in the support member that supports the location of the external connection electrode This is realized with a simple configuration in which the support position of the arc tube is shifted to the upper side.
In addition, the support member has a polygonal shape when viewed in the longitudinal direction of the arc tube, and the arc tube is formed by utilizing a gap formed between the edge of the support member and the inner wall of the cooling member. It is a ventilation path for cooling air to cool.
Furthermore, since the support member has a polygonal shape, the support member can be prevented from rotating in the internal space of the cooling member with a simple configuration in which at least one side of the support member contacts. The stop member can be configured, and the arc tube can be maintained in an appropriate posture.

Further, according to a fifth invention of the present application, in addition to the configuration of the second invention, the arc tube is provided with a support member that supports the location of the external connection electrode. The arc tube is formed such that the center of the circumscribed circle of the support member and the center of the circumscribed circle of the arc tube at the central portion in the longitudinal direction are displaced.
Therefore, in a light source device, a conventional cooling member in which an existing internal space has a substantially cylindrical shape is used as it is, and an arc tube provided with a support member having the above configuration is set in the internal space. The positional relationship of the arc tube in the internal space can be set so that the interval between the upper end of the arc tube and the inner wall of the cooling member is shorter than the interval between the lower end of the arc tube and the inner wall of the cooling member.

Further, a sixth invention of the present application is a straight tube-shaped arc tube provided with external connection electrodes at both ends in the longitudinal direction, and is provided with a support member that supports the location of the external connection electrode, When viewed in the longitudinal direction, the center of the circumscribed circle of the support member and the center of the circumscribed circle of the arc tube at the central portion in the longitudinal direction are formed in a misaligned state.
Therefore, when assembling the arc tube with this structure to the light source device, a cylindrical cooling member in which the existing internal space has a substantially cylindrical shape is used as it is, and a support member having the above-described configuration is provided in the internal space. The light emission in the inner space is such that the interval between the upper end of the arc tube and the inner wall of the cooling member is shorter than the interval between the lower end of the arc tube and the inner wall of the cooling member simply by setting the prepared arc tube. The position relation of the pipe can be set.

According to the first aspect of the present invention, the upper end of the arc tube is closer to the inner wall of the cooling member only by placing the arc tube biased upward in the internal space of the cooling member. The cooling action from the inner wall of the wall becomes stronger.
Therefore, the cooling efficiency for the arc tube can be improved as much as possible while avoiding an increase in the apparatus cost.
Further, according to the second invention, when a straight tube-shaped arc tube is used, it is possible to effectively improve the cooling efficiency for the arc tube, and to avoid problems such as bending of the arc tube. .
According to the third aspect of the invention, the arc tube is cooled using the arc tube support member provided as a configuration for biasing the position of the arc tube in the internal space of the cooling member upward. In addition to forming an air flow path for cooling air, the arc tube can be used to prevent rotation of the arc tube and maintain it in an appropriate posture. Therefore, the support member that supports the arc tube can be made multi-functional and effectively used. .
According to the fourth aspect of the present invention, the arc tube support member provided as a configuration for biasing the position where the arc tube exists in the internal space of the cooling member to the upper side has a polygonal shape, thereby emitting light. It can be used to form a ventilation path for cooling air to cool the tube and to prevent the arc tube from rotating and to maintain an appropriate posture. can do.

According to the fifth aspect of the invention, the arc tube provided with the support member having the above-described configuration in the internal space by using the cylindrical cooling member in which the existing internal space has a substantially cylindrical shape as it is. In the light source device, the light emission in the inner space is such that the distance between the upper end of the arc tube and the inner wall of the cooling member is shorter than the distance between the lower end of the arc tube and the inner wall of the cooling member. Since the positional relationship of the tubes can be set, the cooling efficiency for the arc tube can be improved as much as possible while avoiding an increase in apparatus cost.
According to the sixth aspect of the invention, when the arc tube is assembled to the light source device, the cylindrical cooling member in which the existing internal space has a substantially cylindrical shape is used as it is, and the internal space is filled with the above-described internal space. Just by setting the arc tube provided with the supporting member having the configuration, the interval between the upper end of the arc tube and the inner wall of the cooling member is shorter than the interval between the lower end of the arc tube and the inner wall of the cooling member. Since the positional relationship of the arc tube in the internal space can be set, the cooling efficiency for the arc tube can be improved as much as possible while avoiding an increase in apparatus cost.

The fragmentary sectional view of the light source device concerning an embodiment of the invention The principal part fragmentary sectional view concerning embodiment of this invention The side view of the light source device concerning embodiment of this invention The figure which shows the arc tube concerning another embodiment of this invention. The side view of the light source device concerning another embodiment of the present invention.

Explanation of symbols

1 arc tube 28 anti-rotation member CA cooling air generating means CM cooling member EO external connection electrode SP support member

Hereinafter, embodiments of a light source device of the present invention will be described with reference to the drawings.
As shown in the partial cross-sectional view of FIG. 1, the light source device UL according to the present embodiment is configured with the arc tube 1 and a water cooling jacket 2 that is a cooling member CM that cools the arc tube 1 as main parts. .
In FIG. 1, in order to make the drawing easier to see, portions other than the arc tube 1 are shown in a sectional view, and in the details, the hatched lines indicating the cross section are appropriately omitted.

The arc tube 1 of the present embodiment is an ultraviolet lamp, and is formed in a rod-like straight tube shape as a whole, and electrode leads connected to the discharge electrode 11 inside the arc tube 1 at both longitudinal ends thereof. The wire 12 is sealed, and a portion of the electrode lead wire 12 extending to the outside of the arc tube 1 is taken out as an external connection electrode EO.
The sealing portion of the electrode lead wire 12 to the glass tube and the location of the external connection electrode EO are protected by the base 13, and the location of the base 13 coincides with the location of the external connection electrode EO. .
A holder 14 is attached to a base 13 provided in a pair at both ends in the longitudinal direction in an externally fitted state, and an outer edge of the holder 14 is disposed in the water-cooled jacket 2 in a state of being fitted into an inner wall of the water-cooled jacket 2.
That is, the holder 14 is a support member SP that supports the location of the external connection electrode EO in the arc tube 1.

The water-cooling jacket 2 includes a cylindrical inner tube 21, an outer tube 22 that is also cylindrical and larger in diameter than the inner tube 21, and a member for holding them, and is formed in a substantially cylindrical shape as a whole. Yes.
The arc tube 1 is disposed in the inner space of the water cooling jacket 2 (more specifically, mainly the inner space of the inner tube 21) in a non-contact state with the inner wall of the water cooling jacket 2. Is in a surrounding state.
Both the inner tube 21 and the outer tube 22 are made of quartz, and are arranged coaxially, and a space between the inner tube 21 and the outer tube 22 serves as a cooling water passage.
The inner tube 21 is formed slightly longer than the outer tube 22, and both end portions in the longitudinal direction of the inner tube 21 and the outer tube 22 arranged coaxially are sandwiched between seal rings 23, and the inner tube The distance between 21 and the outer tube 22 is kept constant.

The seal ring 23 is provided with a water supply / drain hole 23a for introducing or discharging cooling water. In FIG. 1, a water supply hose 24 is connected to the water supply / drain hole 23a of the right seal ring 23 to provide a water supply side. Further, a drainage hose 25 is connected to the water supply / drainage hole 23a of the left seal ring 23 to provide a drainage side.
The pair of sealing rings 23 are respectively held and positioned by ring-shaped holding members 26, between the outer tube 22 and the sealing ring 23, and between the inner tube 21, the sealing ring 23, and the holding member 26. Is sealed with an O-ring.
The inner space of the water-cooled jacket 2 in which the arc tube 1 is disposed has a substantially cylindrical shape as a whole, although there is a slight step near the boundary between the inner tube 21 and the holding member 26.
An air supply duct 3 for sending cooling air to the internal space of the water cooling jacket 2 is connected to the holding member 26.

Between the inner tube 21 and the outer tube 22, an exhaust pipe 27 is attached in a state of penetrating the tube walls of the inner tube 21 and the outer tube 22 in the vicinity of the upper center of the water cooling jacket 2.
The connection portion between each pipe 27 and the inner tube 21 and the outer tube 22 is hermetically sealed to prevent leakage of cooling water.
The cooling water supplied from the water supply hose 24 flows into the space between the inner tube 21 and the outer tube 22 through a space formed by the inner surface side of the sealing ring 23 and the outer surface of the inner tube 21, It is discharged to the drainage hose 25 through a space formed by the inner surface of the seal ring 23 on the opposite side (drainage side) and the outer surface of the inner tube 21.

In the arc tube 1, the holders 14 that support the caps 13 at both ends in the longitudinal direction are positioned in contact with the longitudinal edges of the inner tube 21 and fitted in the holding member 26.
The holder 14 is an enlarged view of the vicinity of the longitudinal end of the water cooling jacket 2 and a side view of the arc tube 1 in the longitudinal direction as shown in FIG. Are formed into a polygonal shape (more specifically, a triangular shape), and each apex thereof is in contact with the inner wall of the water-cooling jacket 2 (specifically, the inner wall 26a of the holding member 26). . The triangular shape formed by the holder 14 is a regular triangle or an isosceles triangle close to the regular triangle, and each vertex is in contact with the inner wall of the water cooling jacket 2 in a well-balanced manner.

Since the inner wall 26a has a circular shape when viewed in the longitudinal direction, the holder 14 has a central axis (an axis β described later) around the inner space of the water-cooling jacket 2 in a support configuration in which the holder 14 is only fitted inside the holding member 26. Will rotate.
An anti-rotation member 28 is attached to the side wall of the holding member 26 to prevent the holder 14 from rotating.
As shown in FIG. 2, the anti-rotation member 28 is a member formed by bending a plate material into an L shape, the lower vertical portion is fixed to the side surface of the holding member 26, and the upper horizontal portion is a holder. The holder 14 is prevented from rotating by contacting the bottom side of the holder 14.
In order to prevent the polygonal shape (specifically, triangular) holder 14 from rotating, it can be realized by bringing the rotation preventing member 28 into contact with one side of the polygonal shape as described above. In order to prevent the rotation of the holder 14, the rotation of the holder 14 may be prevented by contacting the other side (oblique side) with at least one side of the polygonal holder 14 in the longitudinal direction. May be used as long as the holder 14 is prevented from rotating.
Further, as is apparent from FIG. 3, the inner wall 26a of the holding member 26 with which each apex of the holder 14 is in contact has a circular shape as viewed in the longitudinal direction of the arc tube 1, and as is apparent from FIG. There is a gap between the inner wall 26 a and the outer edge of the holder 14, and the gap serves as a ventilation path for cooling air supplied from the air supply duct 3.

2 shows the right side end (end on the water supply side) in FIG. 1, but the configuration of the left side end on the opposite side (end on the drainage side) is also symmetric with the same configuration. Has been.
Also in FIG. 2, as in FIG. 1, portions other than the arc tube 1 are shown in cross-sectional view, and in the details, hatching indicating that the cross section is appropriate is omitted.
3 shows the longitudinal direction view from the right end portion (water supply side end portion) in FIG. 1, but the configuration of the opposite left end portion (drainage side end portion) is exactly the same. It is configured.
Further, in FIG. 3, the air supply duct 3, the water supply hose 24 and the external connection electrode EO are not shown in order to make the drawing easy to see.

As is apparent from FIGS. 1 to 3, the arrangement position of the arc tube 1 in the internal space of the water cooling jacket 2 is not located at the center of the internal space of the water cooling jacket 2, but the arc tube 1 is disposed in the internal space. It is biased to the upper side of the center.
Referring to FIG. 3, when the arc tube 1 is viewed in the longitudinal direction, the axis α is the central axis of the arc tube 1 extending in the longitudinal direction and also the center of the base 13, so that the holder 14 supports the arc tube 1. This is a representative position.
The axis β is the central axis of the inner space of the water cooling jacket 2 and the center of the circumscribed circle of the holder 14 when the arc tube 1 is viewed in the longitudinal direction. In the present embodiment, the circle formed by the inner wall 26 a of the holding member 26 corresponds to the circumscribed circle of the holder 14 in relation to the internal space of the water cooling jacket 2 being substantially cylindrical.
The axis α and the axis β are arranged in the vertical direction, and the support position of the arc tube 1 in the holder 14 is higher than the center of the circumscribed circle of the holder 14 in the longitudinal direction of the arc tube 1 by a distance corresponding to the interval. It is set close.

  Since the arc tube 1 is attached at the positions shown in FIG. 3 at both ends in the longitudinal direction, as a result, the arc tube 1 is in a posture parallel to the central axis of the substantially cylindrical inner space, and the internal In the space, the distance between the upper end of the arc tube 1 and the inner wall of the water cooling jacket 2 (in this case, the inner wall of the inner tube 21) (indicated by the distance a in FIG. 2) is the lower end of the arc tube 1 and the inner wall of the water cooling jacket 2 ( The existence position is set so as to be shorter than the interval (indicated by the distance b in FIG. 2) with respect to the inner wall of the inner tube 21, that is, a relationship of a <b.

The above description has been made in terms of the position of the arc tube 1 in the internal space of the water-cooling jacket 2. When attention is paid to the configuration of the arc tube 1 for such an existing position, the external view in the longitudinal direction of the arc tube 1 is described. The center of the circumscribed circle of the holder 14 that is the support member SP that supports the location of the connection electrode EO (the position of the axis β in FIG. 3), and the center of the circumscribed circle of the arc tube 1 in the central portion in the longitudinal direction, It is formed in a misaligned state.
In the present embodiment, the arc tube 1 has a cylindrical shape except for the end portion in the longitudinal direction, and has an axial shape with respect to the central axis. Therefore, the arc tube 1 is circumscribed at the central portion in the longitudinal direction. The position of the center of the circle coincides with the position indicated by the axis α in FIG.
By constructing the arc tube 1 in this way, the arc tube 1 can be located in the internal space as described above simply by inserting the arc tube 1 into the interior space of the water cooling jacket 2 having a substantially cylindrical shape. Setting is realized.

In a state where the water cooling jacket 2 and the arc tube 1 are assembled as shown in FIG. 1, the cooling water is supplied from the water supply hose 24 and the cooling air generating means CA generates cooling air for cooling the arc tube 1. The arc tube 1 is turned on in a state in which cooling air is supplied from a certain blower fan 4 through a pair of air supply ducts 3.
The arc tube 1 generates heat as the light is driven, and heat tends to be trapped particularly in the upper part thereof. This heat is efficiently removed by the upper part of the arc tube 1 being close to the inner wall of the water cooling jacket 2.
Further, the cooling air supplied as a ventilation path through the gap between the holder 14 and the inner wall 26 a of the holding member 26 through the left and right air supply ducts 3 passes through the space around the arc tube 1 and passes through the arc tube 1. Cooled and discharged from the pipe 27 to the outside of the water cooling jacket 2.

[Another embodiment]
Hereinafter, other embodiments of the present invention will be listed.
(1) In the above embodiment, the arc tube 1 itself is divided into the center of the circumscribed circle of the holder 14 (axis β in FIG. 3) and the center of the circumscribed circle of the arc tube 1 in the longitudinal central portion (the axis in FIG. 3). (position of α) is formed in a misaligned state, so that the configuration of the water cooling jacket 2 is not a special configuration, but may be a reverse combination.
That is, the arc tube 1 itself is formed in a simple shape in which the center of the circumscribed circle of the holder 14 coincides with the center of the circumscribed circle of the arc tube 1 in the central portion in the longitudinal direction, and is formed at both ends of the water cooling jacket 2. The support position of the holder 14 may be shifted to the upper side.

(2) In the above-described embodiment, the case where the shape of the holder 14 that is the support member SP that supports the location where the external connection electrode EO is present in the longitudinal direction of the arc tube 1 is triangular. It may be a quadrilateral or more polygon.
(3) In the above embodiment, the case where the cooling air is supplied to the internal space of the water cooling jacket 2 with the blower fan 4 serving as the cooling air generation means CA is illustrated, but it is provided on the wall surface of the water cooling jacket 2. Alternatively, the cooling air may be sent into the internal space of the water cooling jacket 2 by sucking air from the pipe 27 side.
Furthermore, it is good also as a structure which takes in air from the air supply duct 3 side.
(4) Although the ultraviolet lamp is illustrated as the arc tube 1 in the above embodiment, the present invention can also be applied to the arc tube 1 of various wavelengths other than ultraviolet rays.

(5) In the above-described embodiment, the arc tube 1 itself is shaped to be an axial object with respect to its central axis α, and the holding position of the base 13 by the holder 14 is the center of the circumscribed circle of the holder 14 (axis β). The center of the circumscribed circle of the support member SP (holder 14) and the center of the circumscribed circle of the arc tube 1 at the central portion in the longitudinal direction are shifted in position when the arc tube 1 is displaced. However, the arc tube 1 may be shaped as shown in FIG. 4 so as to have the same positional relationship as described above.
4 and FIG. 5 (a diagram corresponding to FIG. 3 in the above embodiment) showing the support state of the arc tube 1 in the longitudinal direction of the arc tube 1 will be described in more detail. 4 and 5, members corresponding to those in the above embodiment are given the same reference numerals. Further, the illustration of the holder 14 is omitted in FIG.

That is, the arc tube 1 as a whole is formed in a substantially cylindrical shape as in the above-described embodiment, but the position of the base 13 in the longitudinal direction of the arc tube 1 is the arc tube 1 at the center in the longitudinal direction. Is formed in a shape displaced from the center of the circumscribed circle (shown as the axis α as in the above embodiment).
Also in FIG. 4, the center of the circumscribed circle of the support member SP (holder 14) is indicated by the axis β, and as shown in FIG. 5, the center of the base 13 coincides with the axis β as viewed in the longitudinal direction of the arc tube 1. The holder 14 supports the base 13. In the example shown in FIG. 5, the base 13 is held at the center of gravity of the holder 14 formed in an equilateral triangle.
As such an arrangement, in the longitudinal direction of the arc tube 1, the circumscribed circle center (axis β) of the support member SP (holder 14) and the circumscribed circle center (axis α) of the arc tube 1 in the longitudinal center portion. ) Are in a misaligned state.

  Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. This application is based on a Japanese patent application (Japanese Patent Application No. 2007-180476) filed on Jul. 10, 2007, the contents of which are incorporated herein by reference.

Claims (6)

A light source comprising an arc tube having external connection electrodes at both ends in the longitudinal direction and a cooling member that is formed in a substantially cylindrical shape and cools the arc tube disposed in a non-contact state in the internal space. A device,
The arc tube is located in the internal space such that an interval between the upper end of the arc tube and the inner wall of the cooling member is shorter than an interval between the lower end of the arc tube and the inner wall of the cooling member. Is a light source device configured.   The light source device according to claim 1, wherein the arc tube is a straight tube-shaped arc tube. The cooling member is formed so that the internal space has a substantially cylindrical shape,
In the arc tube, the location of the external connection electrode is supported by a support member fitted into the inner wall of the cooling member,
The support member is formed in a shape in which a gap is formed between the support member and the inner wall of the cooling member as viewed in the longitudinal direction.
In the longitudinal view, the support position of the arc tube in the support member is set closer to the upper side of the internal space of the cooling member,
The cooling member is provided with an anti-rotation member that contacts at least a part of the support member and prevents the support member from rotating,
3. The light source device according to claim 1, further comprising a cooling air generating unit configured to generate cooling air for cooling the arc tube, with a clearance between the support member and an inner wall of the cooling member as a ventilation path. The cooling member is formed so that the internal space has a substantially cylindrical shape,
In the arc tube, the location of the external connection electrode is supported by a support member fitted into the inner wall of the cooling member,
The support member is formed in a polygonal shape in the longitudinal direction view,
In the longitudinal view, the support position of the arc tube in the support member is set closer to the upper side than the center of the circumscribed circle of the support member,
The cooling member is provided with an anti-rotation member that comes into contact with at least one side of the polygonal support member and prevents the support member from rotating,
3. The light source device according to claim 1, further comprising a cooling air generating unit configured to generate cooling air for cooling the arc tube, with a clearance between the support member and an inner wall of the cooling member as a ventilation path. The arc tube is
A support member for supporting the location of the external connection electrode is provided,
The arc tube in which the center of the circumscribed circle of the support member and the center of the circumscribed circle of the arc tube at the central portion in the longitudinal direction are misaligned when viewed in the longitudinal direction. Light source device. A straight tube-shaped arc tube provided with external connection electrodes at both ends in the longitudinal direction,
A support member for supporting the location of the external connection electrode is provided,
An arc tube in which the center of the circumscribed circle of the support member and the center of the circumscribed circle of the arc tube at the center in the longitudinal direction are misaligned when viewed in the longitudinal direction.

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