JP4807337B2 - Discharge lamp holding mechanism - Google Patents

Description

  The present invention relates to a discharge lamp holding mechanism, and more particularly to a discharge lamp holding mechanism for a large discharge lamp that is difficult to attach to a holder.

In recent years, an exposure technique using a short arc type mercury lamp as a light source for photolithography is used in the fields of semiconductor and liquid crystal exposure and other fine processing.
Mercury lamps that efficiently emit light with a wavelength of 365 nm (i-line), which is sensitive to photoresist, are used for photolithography exposure, and light with a wavelength of 350 nm to 450 nm is emitted for exposure of liquid crystals and printed circuit boards. A mercury lamp is used. In the mercury lamp, mercury is enclosed as a luminescent substance, and a rare gas such as argon, krypton, or xenon is enclosed as a starting gas. Such a mercury lamp constitutes an optical system in combination with a concave reflecting mirror as disclosed in, for example, JP-A-9-213129.

  The exposure apparatus tends to have a shorter processing time (throughput) while an area to be exposed becomes larger. The mercury lamp, which is a light source, also tends to increase the amount of exposure by increasing the input. However, an increase in lamp input results in a physical enlargement of the lamp, which complicates the work of assembling the reflecting mirror. In particular, when the lamp becomes large, it becomes difficult for the operator to hold the lamp in terms of dimensions and weight.

  For example, in the case of a structure in which a lamp is held by being suspended as shown in the above-mentioned JP-A-9-213129, it is necessary to perform fixing work such as screwing while holding the lamp in a suspended state. Furthermore, when the lamp is enlarged, the reflecting mirror is also enlarged. In the above operation, the base of the lamp is inserted from the inner space of the reflecting mirror, passed through the top opening, and fixed by a holding mechanism outside the top opening. In this fixing work, it is necessary to hold one end of the lamp in the inner space of the reflecting mirror and at the same time to perform fixing work such as screwing outside the top opening of the reflecting mirror. In this case, the lamp must be held with one hand and screwed with the other hand. When the lamp becomes large, this work is held with one hand, and sometimes the lamp is dropped or the reflection mirror is damaged.

Furthermore, a reliable power supply configuration must be formed in the work of fixing the discharge lamp and the holding mechanism. This is because current supply becomes insufficient if the electrical connection of the power supply leads and power supply lines is insufficient.
JP-A-9-213129

  An object of the present invention is to provide a discharge lamp holding mechanism capable of easily fixing a discharge lamp even if the discharge lamp is enlarged.

In order to solve the above-described problems, a discharge lamp holding mechanism according to the present invention includes a discharge lamp having a base attached to at least one end thereof, and a lamp that suspends the discharge lamp and holds it so that it can be attached or detached. Consisting of a holder,
A base of the discharge lamp extends along the tube axis of the discharge lamp and is mounted so as to cover an end of the discharge lamp, and a width in a direction perpendicular to the tube axis from the base side of the base A base-side temporary fixing mechanism that protrudes from the front end surface of the base side of the base and extends along the tube axis toward the lamp holder, and an outer peripheral surface on the front side of the base side of the base. With the formed base side fixed mechanism,
The lamp holder is engaged with the base-side main fixing mechanism, and a holder-side base portion having a holder-side temporary fixing mechanism including a recess extending along the tube axis for engaging with the base-side temporary fixing mechanism. A cylindrical holder-side main fixing mechanism that is provided on the outer peripheral surface of the holder-side base portion and rotates in the circumferential direction around the holder-side base portion,
The base and the lamp holder are temporarily fixed by engaging the base side temporary fixing mechanism and the holder side temporary fixing mechanism, and the base side main fixing mechanism and the holder side main fixing mechanism are A discharge lamp holding mechanism that is fixed by being engaged,
The base-side temporary fixing mechanism is formed with a proximal-side fitting portion and a distal-side fitting portion at two locations separated in the tube axis direction, and the proximal-side fitting portion and the distal-side fitting portion. A base side insertion part is formed between the joint part,
The holder-side temporary fixing mechanism includes a proximal-side fitting recess for fitting into the proximal-side fitting portion and the distal-side fitting portion at two locations spaced in the central axis direction of the lamp holder. And a distal-side fitting recess, and a holder-side inserted portion for inserting the base-side insertion portion is formed between the proximal-side fitting recess and the distal-side fitting recess. ,
The discharge lamp holding mechanism, wherein the base and the lamp holder satisfy the relationship shown in the following relationship 1.
(Relationship 1)
The difference between the width in the direction perpendicular to the center axis of the lamp holder in the proximal end fitting recess and the width in the direction perpendicular to the tube axis of the distal fitting part is A,
The difference between the width in the direction perpendicular to the central axis of the lamp holder in the concave portion for fitting on the base end side and the width in the direction perpendicular to the tube axis of the base side insertion portion is B,
The difference between the width in the direction perpendicular to the center axis of the lamp holder in the holder side inserted portion and the width in the direction perpendicular to the tube axis of the tip side fitting portion is C,
The difference between the width in the direction perpendicular to the central axis of the lamp holder in the holder side insertion portion and the width in the direction perpendicular to the tube axis in the base side insertion portion is D,
The difference between the width in the direction perpendicular to the center axis of the lamp holder in the concave portion for fitting on the base end side and the width in the direction orthogonal to the tube axis in the base end side fitting portion is E,
When the difference between the width in the direction perpendicular to the central axis of the lamp holder in the concave portion for fitting on the tip side and the width in the direction perpendicular to the tube axis in the fitting portion on the tip side is F,
Any of A through D is greater than both E and F.

The holder-side temporary fixing mechanism is formed with an engaging portion extending in a convex shape toward the central axis of the holder-side base portion in a direction perpendicular to the tube axis of the discharge lamp,
The base-side temporary fixing mechanism has an engaged portion formed of a bowl-shaped recess that is recessed toward the central axis of the base-side base portion for engaging with the engaging portion. It is characterized by.

The base side main fixing mechanism has a base side screw portion formed on the outer peripheral surface on the tip side of the base side base portion.
The holder side main fixing mechanism is characterized in that a holder side screw portion is formed on an inner peripheral surface thereof.

  The base and the lamp holder are made of a conductive member, and the base and the lamp holder are permanently fixed in a state where the distal end surface of the base side of the base and the base end surface of the holder side base are in contact with each other. Thus, an electric power feeding mechanism is formed.

The lamp holder is formed with a rotation suppressing body that protrudes from the base end surface of the holder-side base portion toward the base-side base portion,
The base is characterized in that a recess for engaging with the rotation suppressing body is formed on the front end surface of the base part on the base side.

  The discharge lamp has a rated current of 50 A or more.

The discharge lamp holding mechanism according to the present invention can be held even if the discharge lamp is released by operating the base-side temporary fixing mechanism and the holder-side temporary fixing mechanism (temporary fixing). It is not necessary to hold the lamp with the other hand while holding the lamp.
Moreover, the base-side temporary fixing mechanism is formed with two base-side fitting portions spaced apart in the tube axis direction, and the holder-side temporary fixing mechanism is separated in the tube axis direction corresponding to each base-side fitting portion. Since the holder-side fitting portion is formed at the two locations, it is possible to reliably recognize that the temporary fixing has been completed in the operation of temporarily fixing the discharge lamp to the lamp holder. Increases efficiency.
In addition, since the base and the lamp holder are configured to satisfy the above relationship 1, the base-side temporary fixing mechanism can freely move in a direction perpendicular to the tube axis inside the holder-side temporary fixing mechanism. Even when the center axis of the base side temporary fixing mechanism is eccentric from the holder central axis during temporary fixing work, the base side temporary fixing mechanism can be changed to the holder side temporary fixing mechanism without damaging the discharge lamp. Engagement can be ensured.

  Furthermore, since the discharge lamp holding mechanism according to the present invention is configured to satisfy the relationship 2 in addition to the relationship 1, the base-side temporary fixing mechanism is orthogonal to the tube axis inside the holder-side temporary fixing mechanism. Therefore, it is possible to more reliably prevent the discharge lamp from being damaged when the temporary fixing operation is performed.

Further, the holder-side temporary fixing mechanism is formed with an engaging portion extending in a convex shape toward the central axis of the holder-side base portion in a direction orthogonal to the tube axis of the discharge lamp, and the base-side temporary fixing Since the mechanism is formed with an engaged portion made of a bowl-shaped recess that is depressed toward the central axis of the base-side base portion for engaging with the protruding portion.
By engaging the engaging portion provided in the lamp holder with the engaged portion provided in the base, the discharge lamp can be reliably supported in a suspended state, and the discharge lamp is supported with one hand. Since it is not necessary, the efficiency of the work of permanently fixing the discharge lamp and the lamp holder is improved.

  Furthermore, since the base-side screw portion is formed on the outer peripheral surface of the tip side of the base-side main fixing mechanism and the holder-side screw portion is formed on the inner peripheral surface of the holder-side main fixing mechanism, the respective screw portions are screwed together. By doing so, the base of the discharge lamp and the lamp holder can be securely fixed.

  Further, the base and the lamp holder are made of a conductive member, and the base and the lamp holder are permanently fixed in a state where the distal end surface of the base side base portion and the base end surface of the holder side base portion are in contact with each other. Since there is no need to use a lead wire as in the prior art, there is no possibility of damaging the reflection mirror when the discharge lamp is attached to the reflection mirror.

  Furthermore, the lamp holder is formed with a protrusion that protrudes from the base end surface of the holder-side base portion toward the base-side base portion, and the base engages with the protrusion on the tip surface of the base-side base portion. Therefore, the base rotates in the circumferential direction during the main fixing operation in which the holder side main fixing mechanism is rotated to fix the holder side main fixing mechanism to the base side main fixing mechanism. This will improve the work efficiency of permanent fixing.

  According to the discharge lamp holding mechanism of the present invention as described above, there is no possibility of damaging the discharge lamp or damaging the reflection mirror when a large discharge lamp having a rated current of 50 A or more is fixed to the lamp holder.

Below, the outline of the whole structure of the discharge lamp holding | maintenance mechanism of this invention is demonstrated using FIGS. 1-3. FIG. 1 shows a discharge lamp holding mechanism in a state in which a discharge lamp 10 is mounted on a lamp holder 5 attached to a holding table 30 of an exposure apparatus and both are fixed.
The discharge lamp 10 (hereinafter also simply referred to as “lamp”) passes through the top opening of the reflecting mirror 20 and is attached to the lamp holder 5 (hereinafter also simply referred to as “holder”). Here, the lamp 10 and the holder 5 are referred to as a discharge lamp holding mechanism, and the lamp 10, the reflection mirror 20, and the holder 5 are referred to as a light source device. The holder 5 is fixed to the holding table 30 of the exposure apparatus, for example, by screwing. The holding base 30 is provided with an auxiliary fixing point 31 at a position deviated from the axis center of the holder 5. The holder 5 is also supplementarily fixed to the fixing point 31. The reflection mirror 20 and the holding table 30 are fixed to the exposure apparatus by a mechanism not shown.

  FIG. 2 shows only the lamp 10 in a state before the discharge lamp 10 is fixed to the lamp holder 5. The discharge lamp 10 has an arc tube portion 11 made of, for example, quartz glass at the approximate center in the tube axis (hereinafter also simply referred to as “tube axis”) direction (vertical direction in the drawing) of the discharge lamp 10. A rod-shaped sealing portion 12 is integrally formed at both ends of 11 so as to extend along the tube axis. The arc tube portion 11 has a spherical shape or a spindle shape elongated in the tube axis direction, and mercury, which is a luminescent material, xenon, or argon, which is a starting gas, is enclosed in an airtight space formed therein. In addition, the anode 13 and the cathode 14 are disposed opposite to each other inside the arc tube portion 11, and the interval between the tips is formed as a discharge gap. The discharge gap is also the distance between the electrodes, for example, about 5 mm. A cylindrical base 4 is attached to the tip of the sealing portion 12. A cylindrical base is also attached to the tip of the lower sealing portion in FIG. 2, but this base is not essential in the present invention. The lamp 10 has a vertical arrangement in which one of the electrodes is located above and the other electrode is located below. In this embodiment, the cathode is arranged below and the anode is arranged above.

  Returning to FIG. 1, the reflecting mirror 20 is formed by coating a reflecting surface of a glass base material with a multilayer film, for example, and has a concave shape as a whole and reflects the radiated light from the lamp 10 well. In many cases, an elliptical condensing mirror is used as the reflecting mirror 20. In this case, it is necessary to make the arc of the discharge lamp 10 coincide with the first focal point of the reflecting mirror 20. Since this arc is generally formed between the discharge gaps, the lamp is installed so that an appropriate point between the discharge gaps is at the first focal point of the reflection mirror 20. The direction of the mirror is shown as open at the bottom, but there are also those that are open at the top (holder side).

In recent years, the lamp 10 and the reflection mirror 20 have become larger. As described above, the discharge lamp holding mechanism of the present invention is particularly useful when the size of the lamp or the reflecting mirror is increased.
As an example of the numerical value of the lamp 10, the lamp power is rated value 3KW to 40KW, the lamp current is rated value 50A to 200A, the maximum outer diameter of the arc tube portion 11 (diameter perpendicular to the direction in which the electrode extends) is 50mm to 250 mm. The weight of the lamp is 0.5 kg to 10 kg. As a numerical example of the reflection mirror 20, the front opening is φ300 mm to 1000 mm, and the depth in the direction in which the lamp extends is 200 mm to 800 mm.

  3 shows a state where the light source device shown in FIG. 1 is viewed from a direction different from that in FIG. 1, and a part of the reflection mirror 20 is cut away to express the internal structure of the reflection mirror 20. The top opening 21 of the reflecting mirror 20 needs at least a size that allows the sealing portion 12 or the base 4 of the lamp 10 to pass through. If the top opening 21 is too large, the emitted light of the lamp 10 leaks from the top opening 21 and the light utilization efficiency decreases.

  Below, the structure of the nozzle | cap | die 4 and the lamp holder 5 which concern on the discharge lamp holding mechanism of this invention using FIG. 4 and FIG. 5 is demonstrated. FIG. 4 is a perspective view showing an outline of the configuration of a base attached to the sealing portion of the discharge lamp of the present invention. FIG. 5 is a perspective view of a cross section obtained by cutting the lamp holder in the central axis direction, showing an outline of the configuration of the lamp holder according to the present invention.

  The configuration of the base 4 according to the present invention will be described with reference to FIG. The base 4 is formed in a cylindrical shape as a whole, extends along the tube axis of the discharge lamp 10 (hereinafter simply referred to as “tube axis”), and is attached to the sealing portion 12. A column-shaped base-side temporary fixing mechanism 42 that is formed continuously with the base portion 41 and extends along the tube axis is provided. The base-side base portion 41 is continuous with the base-side body portion 411 attached to the sealing portion 12 of the lamp 10 and the distal end side of the base-side body portion 411, with respect to the tube axis rather than the base-side body portion 411. And a base-side flange portion 412 formed in a bowl shape so as to increase the width in the orthogonal direction (hereinafter also simply referred to as “width”). The base-side base portion 41 and the base-side temporary fixing mechanism 42 are physically configured by a single member, for example, a conductive member such as brass.

  The base-side flange portion 412 includes a flat base-side power feeding surface 413 on the distal end side, and a base-side screw portion 414 is formed on the outer peripheral surface thereof. In the example shown in FIG. 4, the base-side screw portion 414 is a base-side main fixing mechanism. The base-side power supply surface 413 extends in a direction orthogonal to the tube axis of the discharge lamp 10, and comes into surface contact with a holder-side power supply surface 516 of the lamp holder 5, which will be described later, thereby electrically connecting the lamp 10 and the base 4. A power feeding mechanism is formed.

  The base-side temporary fixing mechanism 42 is formed in a column shape having a width smaller than that of the base-side body portion 411 and the base-side flange portion 412, and is formed on the tube axis toward the lamp holder 5 side at a substantially central position of the base-side power feeding surface 413. It is provided so as to extend along the convex shape. The base-side temporary fixing mechanism 42 has a columnar base-side fitting portion 421 formed continuously with the base-side power feeding surface 413 for fitting into the base-side fitting concave portion 531 of the lamp holder 5; A proximal end side fitting portion 421 that is continuous with the proximal end side fitting portion 421 across a taper portion 421a that gradually decreases in width toward the distal end side so as to pass through the holder side inserted portion 532 of the lamp holder 5. A base-side insertion part 422 formed in a columnar shape having a smaller width than the base-side insertion part 423 having the same width as the base-side insertion part 422 for fitting into the front-end side recess 533 of the lamp holder 5. And a tapered portion 423a that gradually decreases in width toward the distal end side continuously to the distal end side fitting portion 423, and a circle that has a smaller width than the distal end side fitting portion 423 continuously from the tapered portion 423a. Columnar And a end 424. That is, the base-side temporary fixing mechanism 42 has base-side fitting portions (421, 423) formed at two locations separated in the tube axis direction with the base-side insertion portion 422 interposed therebetween.

  The distal end portion 424 of the base-side temporary fixing mechanism 42 has a smaller width than any of the proximal-side fitting concave portion 531, the holder-side inserted portion 532, and the distal-side fitting concave portion 533 in the holder-side temporary fixing mechanism 53. It functions as a guide when the base-side temporary fixing mechanism 42 enters toward the holder-side temporary fixing mechanism 53, and is provided to facilitate the entry of the base-side temporary fixing mechanism 42.

The base-side temporary fixing mechanism 42 is engaged by a hook-shaped recess that is recessed toward the central axis of the base-side base portion 41 for engaging with an engaging portion 54 provided in the lamp holder 5. The part 425 is formed so as to straddle the base side insertion part 422, the distal end side fitting part 423, and the taper part 423a.
As shown in FIG. 7, the hook-shaped engaged portion 425 is formed in a region extending over the base side insertion portion 422, the distal end side fitting portion 423, and the tapered portion 423a, and the distal end side in the tube axis direction is a tapered portion 423a. And an axial groove 425a having an inner wall surface 426a on the other end side in the tube axial direction, and an axial groove 425a formed in the base side insertion portion 422 and orthogonal to the axial groove 425a. The width direction groove | channel 425b extended in the direction and the axial direction groove | channel 425c formed in the nozzle | cap | die side insertion part 422 continuously in the direction orthogonal to the width direction groove | channel 425b following the width direction groove | channel 425b are comprised.

  Recesses 415 for engaging the rotation suppressing bodies 517 provided on the lamp holder 5 are formed at two locations on the base-side power feeding surface 413 formed on the base-side flange portion 412. . Further, at two locations on the base-side power supply surface 413, recesses 416 for engaging the protrusions 520 provided on the lamp holder 5 are formed. By providing such a recess 416, it is possible to eliminate the fact that the discharge lamp 10 including the base 4 that is not compatible with the lamp holder 5 is fixed to the lamp holder 5.

  Then, the structure of the lamp holder 5 which concerns on this invention is demonstrated using FIG. The lamp holder 5 includes a holder-side base portion 51 for engaging with the base-side base portion 41, a rotating body 52 that is attached to the base end side of the holder-side base portion 51 and rotates around the holder-side base portion 51. It has. The holder-side base 51 is a cylindrical holder-side body 511 that is electrically connected to the holder 30 of the exposure apparatus, and a holder-side body formed continuously on the base end side of the holder-side body 511. And a flange-like holder-side flange portion 512 having a width larger than that of the base end portion 518 of the portion 511.

  The holder-side body 511 is such that the base-side flange 412 and the rotating body 52 are completely separated from the front end surface 519 of the holder-side flange 512 by a predetermined distance toward the front end of the holder-side body 511. A mark 514 indicating the position of the rotating body 52 when the main body is fixed is formed. The mark 514 may be anything that can be visually recognized, such as one provided with an annular notch in the circumferential direction of the holder-side body 511 and one obtained by applying a dye on the outer peripheral surface of the holder-side body 511. The front end 515 of the holder side body 511 is attached to the holding table 30 of the exposure apparatus and is electrically connected to the holding table 30. A flat holder-side power feeding surface 516 is formed on the base end side of the holder-side flange portion 512.

  The holder-side flange portion 512 includes a holder-side temporary fixing mechanism 53 formed of a concave portion extending toward the distal end portion 515 side of the holder-side trunk portion 511 along the central axis of the lamp holder 5 at a substantially central position. The holder-side temporary fixing mechanism 53 includes a proximal-side fitting recess 531 for fitting into the proximal-side fitting portion 421 of the base 4 and a holder-side base portion 51 for inserting the base-side inserting portion 422. A width in a direction perpendicular to the central axis (hereinafter, also simply referred to as “width”) is the same as that of the proximal-side fitting concave portion 531, and is fitted to the distal-side fitting portion 423. And a recessed portion 533 for front end side fitting having a width smaller than that of the holder side inserted portion 532. That is, the holder-side temporary fixing mechanism 53 is fitted to the holder-side temporary fixing mechanism 42 for fitting the base-side temporary fixing mechanism 42 at two positions spaced in the central axis direction of the holder-side base portion 51 with the holder-side inserted portion 532 interposed therebetween. A combined recess is formed.

The holder-side temporary fixing mechanism 53 is formed with a columnar engaging portion 54 that extends in a convex shape toward the central axis of the lamp holder in the direction orthogonal to the tube axis in the holder-side inserted portion 532 (FIG. 6). See).
By engaging the engaging portion 54 provided in the holder-side temporary fixing mechanism 53 with the engaged portion 425 provided in the base-side temporary fixing mechanism 42 as described later, as will be described later, the engaging portion 54. Thus, the discharge lamp 10 with the base 4 attached can be temporarily fixed in a suspended state, so that the operator does not need to hold the discharge lamp 10 with one hand.

  Here, the specifications of the base-side temporary fixing mechanism 42 and the holder-side temporary fixing mechanism 53 will be described below. The base-side fitting portion 421 has a width of 0 to 1% (usually 0.05 to 0) than the base-side fitting recess 531 so that the base-side fitting recess 531 has a fitting relationship with the base-side fitting recess 531. .3%) formed small. The base side insertion portion 422 is formed to be 0.5 to 100% (usually 5 to 20%) smaller in width than the holder side insertion portion 532 so that the holder side insertion portion 532 is not fitted. Has been. The distal end fitting portion 423 has a width of 0 to 1% (usually 0.05 to 0.3%) than the distal end fitting recess 533 so that the distal end fitting recess 533 is in a fitting relationship. ) It is formed small.

  Since the base side temporary fixing mechanism 42 and the holder side temporary fixing mechanism 53 have such specifications, when the base 4 and the lamp holder 5 are temporarily fixed, the base 4 does not move in the radial direction and decenter. Since the base 4 can be fixed at an appropriate position in the tube axis direction, the discharge lamp 10 can be reliably positioned in the tube axis direction.

Furthermore, according to the example of the discharge lamp holding mechanism, the base side temporary fixing mechanism 42 and the holder side temporary fixing mechanism 53 are configured to satisfy the following relationship.
The difference between the width D1 of the proximal-side fitting concave portion 531 and the width d3 of the distal-side fitting portion 423 is A,
The difference between the width D1 of the proximal-side fitting concave portion 531 and the width d2 of the base-side insertion portion 422 is B,
The difference between the width D2 of the holder side inserted portion 532 and the width d3 of the distal end side fitting portion 423 is C,
The difference between the width D2 of the holder-side inserted portion 532 and the width d2 of the base-side inserted portion 422 is D,
The difference between the width D1 of the proximal-side fitting recessed portion 531 and the width d1 of the proximal-side fitting portion 421 is E,
When the difference between the width D3 of the leading-end fitting recess 533 and the width d3 of the leading-end fitting portion 423 is F,
All of A, B, C and D are larger than both E and F.

  By providing such a configuration, as will be described later, when the base 4 attached to the discharge lamp 10 is inserted into the lamp holder 5 and temporarily fixed, the central axis of the base 4 is the center of the lamp holder 5. Even if the base is inserted while being inclined with respect to the central axis, the sealing portion 12 of the discharge lamp 10 may not be damaged unless the inclination is extremely large.

  Furthermore, the other structure of the lamp holder 5 is demonstrated. The rotating body 52 extending along the central axis of the lamp holder 5 has a cylindrical rotating main body 521 attached to the outer peripheral surface of the holder-side flange 512, and before the base 4 and the lamp holder 5 are permanently fixed. A part of the base end side of the rotating main body 521 extends in the central axis direction beyond the holder-side power feeding surface 516, and is manually rotated in the circumferential direction around the holder-side base body 51. is there.

A cylindrical rotary reduced diameter portion 522 having an outer diameter smaller than that of the rotary main body portion 521 is continuously formed on the distal end side of the rotary main body portion 521, and the rotary reduced diameter portion 522 is formed on the holder side body portion 511. It is attached to the outer peripheral surface of the base end portion 518. The mark 514 provided on the holder-side body 511 is in a state in which it cannot be seen by being hidden inside the rotating body 52 before the base 4 and the lamp holder 5 are permanently fixed. When the rotating body 52 is manually rotated in the circumferential direction, the position where the base end surface 523 of the rotation reduced diameter portion 522 abuts on the front end surface 519 of the holder side flange portion 512, that is, the position where the mark 514 can be visually recognized. And a rotating body retainer (not shown) formed closer to the tip end of the holder side body 511 than the tip end surface 519 of the holder side flange portion 512 can move in the vertical direction.
A holder-side screw portion 525 for screwing into a base-side screw portion 414 formed on the base 4 is formed on the inner peripheral surface of the rotary main body portion 521. For example, a knurling process is performed on the outer peripheral surface of the rotating main body 521 so that a manual rotating operation can be easily performed. The holder side main fixing mechanism is constituted by a rotating body 52 including a holder side screw portion 525.

  The holder-side base portion 51, the rotating body 52, and the base 4 are made of, for example, copper, brass, or a conductive material in which these base materials are coated with a low-oxidation and chemical-resistant material such as nickel, silver, or gold. It is configured. The base 4 and the lamp holder 5 can be electrically connected by bringing the holder side power supply surface 516 having conductivity into contact with the base side power supply surface 413 having conductivity. Therefore, power can be supplied to the discharge lamp 10 via the lamp holder 5 by merely bringing the base-side power supply surface 413 and the holder-side power supply surface 516 into surface contact without using a lead wire as in the prior art. .

The holder-side flange portion 512 has a rotation suppressing body 517 extending along the tube axis for insertion into each of the recesses 415 provided in the base-side power feeding surface 413 at two locations across the holder-side body portion 511. Each is provided as follows.
The rotation suppressing body 517 is larger than the base end portion 517a continuously to the base end portion 517a and a rod-like base end portion 517a extending along the tube axis for engaging with the recess 415 of the base-side power feeding surface 413. A flange-shaped flange portion 517b having a width and a rod-shaped distal end portion 517c that is continuous with the flange portion 517b and has a width smaller than that of the flange portion 517b, and a proximal end without contacting the outer peripheral surface of the proximal end portion 517a An elastic body 517d attached to the flange portion 517b is provided so as to surround the portion 517a spirally.
The holder-side flange portion 512 is formed with a cavity capable of accommodating the rotation suppressing body 517 along the tube axis. Specifically, the base end portion 517a is directed from the holder-side power feeding surface 516 toward the base 4 side. A proximal end opening 512a having a size that can be extended, a housing portion 512b having a size capable of housing the flange portion 517b and the proximal end portion 517a continuously to the proximal end opening 512a, and housing Continuing from the portion 512b, a distal end side opening 512c having a size that allows the distal end portion 517c to extend from the distal end surface 519 of the holder side flange portion 512 is formed.

  By providing such a rotation suppressing body 517, the rotating body 52 is placed on the distal end surface of the distal end portion 517c of the rotation suppressing body 517 when the rotating body 52 is rotated and the base 4 and the lamp holder 5 are permanently fixed. By contacting, the base end portion 517a of the rotation suppressing body 517 extends from the holder-side power supply surface 516 toward the base 4 side and is engaged with each of the recesses 415 provided on the base-side power supply surface 413. Thus, the rotation restraining body 517 restricts the base 4 from rotating in the circumferential direction, so that the workability of the main fixing is greatly improved.

  Further, the holder-side flange portion 512 has two protrusions 520 for insertion into the respective recesses 416 provided on the base-side power supply surface 413 from two locations on the holder-side power supply surface 516. (FIG. 5 is a cross-sectional view, so that a protrusion 520 is formed only at one location). By engaging each of the protrusions 520 with respect to each of the recesses 416, only the base 4 and the lamp holder 5 that are compatible with each other can be fixed. There is no possibility that the discharge lamp 10 having the base 4 that does not fit in relation will be permanently fixed to the lamp holder 5.

  Hereinafter, an operation of temporarily fixing and permanently fixing the base 4 attached to the discharge lamp 10 to the lamp holder 5 will be described. 6 to 10 are views for explaining a procedure for fixing the base 4 attached to the discharge lamp 10 to the lamp holder 5. The procedure for fixing the base 4 to the lamp holder 5 is in the order of FIGS. 6 to 10, and the base 4 is attached to the lamp holder 5 as it proceeds from FIG. 6 to FIG. 10. The procedure for removing the base 4 from the lamp holder 5 is in the order of FIGS. In addition, although the engagement part 54 is originally provided in the cross section of the abbreviate | omitted side, the engagement part is shown in FIGS. 6-10 for convenience of explanation.

  A first step of the temporary fixing operation for temporarily fixing the discharge lamp 4 to the lamp holder 5 will be described with reference to FIGS. FIG. 6 shows a state immediately before the base-side temporary fixing mechanism 42 of the base 4 is inserted into the holder-side temporary fixing mechanism 53 of the lamp holder 5. The operator holds the discharge lamp 10 with one hand, and directs the base-side temporary fixing mechanism 42 toward the holder-side temporary fixing mechanism 53 of the lamp holder 5 located above the base 4 in the vertical direction. Advancing toward the lamp holder 5 from below.

  FIG. 7 shows a state where the holder-side temporary fixing mechanism 53 of the lamp holder 5 is inserted into the base-side temporary fixing mechanism 42 of the base 4. In the base 4, the engaging portion 54 provided in the holder-side temporary fixing mechanism 53 abuts against the inner wall surface 426 a of the axial groove 425 a in the bowl-shaped engaged portion 425 of the base-side temporary fixing mechanism 42. The tip side fitting portion 423 is fitted into the tip side fitting recess 533 by entering the lamp holder 5 side until the base side feeding surface 413 contacts the holder side feeding surface 516 of the lamp holder 5, and the tip side fitting portion 423 is fitted. The insertion portion 422 is inserted into the holder-side inserted portion 532 so that the proximal-side fitting portion 421 is fitted into the proximal-side fitting recess 531.

  When the base-side temporary fixing mechanism 42 is temporarily fixed to the holder-side temporary fixing mechanism 53, since the holder-side temporary fixing mechanism 53 has an engaging portion 54, the base-side temporary fixing mechanism 42 is engaged with the engaging portion 54. The entry of the base 4 may be hindered by colliding with. In this case, by rotating the base 4, the engaging portion 54 is made to coincide with the axial groove 425 a in the engaged portion 425 so that the entry of the base 4 is not hindered.

Next, the second step of the temporary fixing operation will be described with reference to FIGS. As shown in FIG. 7, after the engaging portion 54 is in contact with the inner wall surface 426a of the axial groove 425a, the engaging portion 54 advances along the widthwise groove 425b as shown in FIG. The base 4 is rotated so as to contact the inner wall surface 426b of the axial groove 425c. After releasing the state from the discharge lamp 10 after the state shown in FIG. 8, the discharge lamp 10 falls downward in the vertical direction due to the weight of the discharge lamp 10, and as shown in FIG. The discharge lamp 10 is locked by contacting the inner wall surface 426c of the direction groove 425c, and the temporary fixing operation is completed. In the state shown in FIG. 9 in which the temporary fixing operation is completed, the discharge lamp 10 falls downward in the vertical direction by a distance corresponding to the entire length of the axial groove 425c, whereby the base side power supply surface 413 and the holder side power supply surface 516 are obtained. There is a gap between the two.
Thus, “temporarily fixed” means that the engaging portion 54 provided in the lamp holder 5 is engaged with the engaged portion 425 provided in the base 4 so that the engaging portion 54 causes the discharge lamp. 10 means a suspended state.

Finally, the main fixing operation will be described. FIG. 10 shows a state in which the base 4 and the lamp holder 5 are permanently fixed. The rotating body 52 is manually rotated in the circumferential direction until the mark 514 formed on the holder-side body 511 can be visually recognized, and the holder-side screw part 525 and the base-side screw formed on the inner peripheral surface of the rotating main body 521. The main fixing operation of the base 4 and the lamp holder 5 is completed by screwing the part 414 together. Thus, “main fixing” means a state in which the holder side screw portion 525 of the rotating body 52 and the base side screw portion 414 of the base 4 are screwed together.
During the main fixing operation, the base end surface 523 of the rotation diameter reducing portion 522 is brought into contact with the distal end surface of the distal end portion 517c of the rotation suppressing body 517, whereby the entire rotation suppressing body 517 is pushed downward in the vertical direction. The base end portion 517a of each rotation suppressing body 517 extends from the holder side power supply surface 516, and the base end portion 517a of each rotation suppression body 517 is formed in each recess 415 provided in the base side power supply surface 413. Engaged. By doing so, there is no possibility that the rotating body 52 is rotated and at the same time the base 4 is rotated, so that the workability of the main fixing work is expected to be improved.

  After the fixing operation is completed, the base-side power supply surface 413 and the holder-side power supply surface 516 come into contact with each other, so that the base-side power supply surface 413 presses the holder-side power supply surface 516 downward, and the rotation reduced diameter portion 522 Since the base end surface 523 abuts on the distal end surface 519 of the holder side flange portion 512, the rotation diameter reducing portion 522 presses the holder side flange portion 512 downward, so that the base side power supply surface 413 and the holder side power supply are supplied. The base 4 and the lamp holder 5 can be firmly fixed in a state where the surface 516 is in contact. Therefore, after the main fixing, the base 4 and the lamp holder 5 are in a conductive state, and an electric power feeding mechanism is formed.

  When removing the discharge lamp that has reached the end of its life, the procedures shown in FIGS. 10 to 6 are performed. That is, the rotating body 52 is rotated in the opposite direction to that at the time of permanent fixing to release the base-side screw portion 414 from the holder-side screw portion 525, and the rotating body 52 is moved upward in the vertical direction, as shown in FIG. And In this state, by rotating the base 4 in the circumferential direction and moving the engaging portion 54 in the order of FIGS. 8 and 7, the discharge lamp 10 to which the base 4 is mounted is pulled out downward in the vertical direction. The discharge lamp 10 that has reached the end of its life is removed from the lamp holder 5.

  According to the discharge lamp holding mechanism of the present invention as described above, basically, the base-side temporary fixing mechanism 42 is engaged with the holder-side temporary fixing mechanism 53 so that the hook-shaped engaged portion 425 is engaged. By setting the engagement portion 54 in the axial groove 425c, the discharge lamp 10 is temporarily fixed in a suspended state to the extent that it does not fall. Therefore, when fixing the heavy discharge lamp 10 to the lamp holder 5, it is not necessary to perform a complicated operation such as performing the main fixing operation only with the other hand while supporting the discharge lamp with one hand. The efficiency of the work of attaching the discharge lamp to the lamp holder is improved.

  In addition, according to the discharge lamp holding mechanism of the present invention, the base 4 and the lamp holder 5 can be electrically connected to each other by firmly bringing the base side power supply surface 413 and the holder side power supply surface 516 into surface contact. Power can be supplied to the discharge lamp 10 via the holder 5. Therefore, for example, a large-scale discharge lamp that needs to flow a large current of 50 to 250 A (ampere) can be reliably supplied with a large current, but a power supply lead as in the conventional discharge lamp 10 is used. Since no line is required, the reflecting surface of the reflecting mirror 20 is not damaged when the discharge lamp 10 is fixed to the lamp holder 5, and there is no possibility of impairing the light reflecting characteristics of the reflecting surface.

  Furthermore, according to the discharge lamp holding mechanism according to the present invention, the workability in the temporary fixing work described based on FIGS. 6 to 10 is remarkably improved, which will be described below.

  According to the discharge lamp holding mechanism of the present invention, as described above, the base end side fitting portion 421 and the tip end side fitting portion 423 formed at two locations spaced apart in the tube axis direction of the base side temporary fixing mechanism 42. Are respectively fitted in a proximal-side fitting recess 531 and a distal-side fitting recess 533 formed at two positions spaced apart in the holder central axis direction of the holder-side temporary fixing mechanism 53. As a result, the base-side temporary fixing mechanism 42 is restricted from moving in the direction perpendicular to the tube axis at two positions, the back-side position and the inlet-side position in the holder-side temporary fixing mechanism 53. Since the range in which the discharge lamp 10 can move with respect to the lamp holder 5 becomes narrow, the operator can recognize that the first step of the temporary fixing operation shown in FIG. 7 has been completed.

  Furthermore, according to the discharge lamp holding mechanism of the present invention, as described above (paragraph 0038), all of A, B, C, and D are configured to satisfy the relationship that all of E and F are larger. Therefore, even if the base is inserted in a state where the central axis of the base 4 is inclined with respect to the central axis of the lamp holder 5, the sealing portion 12 of the discharge lamp 10 is damaged unless the inclination is extremely large. There is no fear. This will be described below with reference to FIGS.

  FIG. 11 shows a state before the base-side temporary fixing mechanism 42 of the base 4 is engaged with the holder-side temporary fixing mechanism 53 of the lamp holder 5. FIG. 12 shows a state in which the base-side temporary fixing mechanism 42 is engaged with the holder-side temporary fixing mechanism 53 of the lamp holder 5 with its central axis inclined with respect to the central axis of the lamp holder 5. FIG. 13 shows that the distal end side fitting portion 423 of the base side temporary fixing mechanism 42 is completely fitted into the distal end side fitting concave portion 533 of the holder side temporary fixing mechanism 53, and the proximal end side fitting portion 421 is A state in which the base end side fitting recess 531 is completely fitted is shown. FIG. 14 shows a comparative example having no configuration of the discharge lamp holding mechanism of the present invention.

That is, as shown in FIG. 12, the base-side temporary fixing mechanism 42 enters the holder-side temporary fixing mechanism 53 in a state where the central axis of the base-side temporary fixing mechanism 42 is inclined with respect to the central axis of the lamp holder 5. Even in this case, the distal end side fitting portion 423 and the base side insertion portion 422 of the base 4 can freely move in the width direction at the proximal end side fitting recess 531 and the holder side inserted portion 532 of the lamp holder 5. Since there is a space that can be formed, no stress is applied to the sealing portion 12 of the discharge lamp 10 unless the inclination of the base-side temporary fixing mechanism 42 is extremely large. Therefore, there is no possibility that the sealing portion 12 of the discharge lamp 10 is broken.
Moreover, since the width of the axial groove 425a in the hook-shaped engaged portion 425 provided in the base side temporary fixing mechanism 42 is slightly larger than the width of the engaging portion 54, the engaging portion 54 is engaged. As long as it passes through the opening in the portion 425, the inner wall surface of the axial groove 425 a serves as a guide, and the base 4 is advanced with the central axis of the base-side temporary fixing mechanism 42 aligned with the central axis of the lamp holder 5. be able to. Therefore, as shown in FIG. 13, the cap 4 and the lamp holder 5 are connected to the inner wall surface 426 a of the axial groove 425 a and the front end side fitting portion 423 is fitted to the front end side fitting recess 533. The base end side fitting portion 421 is easily fitted into the base end side fitting concave portion 531.

  On the other hand, as shown in FIG. 14, the base side temporary fixing mechanism 42 'and the holder side temporary fixing mechanism 53' are fitted to the holder side temporary fixing mechanism 53 over the entire length of the base side temporary fixing mechanism 42 '. In some cases, there is no space for the base-side temporary fixing mechanism 42 ′ to move freely in the width direction in the holder-side temporary fixing mechanism 53 ′. If the shaft is inclined with respect to the central axis of the lamp holder 5 ′, stress is applied to the sealing portion 12 of the discharge lamp 10, and there is a high risk that the sealing portion 12 is damaged.

  Hereinafter, another embodiment of the present invention will be described with reference to FIGS. In the embodiment shown in FIGS. 15 to 17, the description of the configuration common to FIGS. 4 and 5, the temporary fixing work, and the main fixing work is omitted.

  In the embodiment shown in FIGS. 15 to 17, as in the embodiment shown in FIGS. 4 and 5, all of the above-mentioned (paragraph 0032) A, B, C, and D are larger than both E and F. And the relationship that the width d3 of the distal end side fitting portion is smaller than the width d1 of the proximal end side fitting portion.

  The embodiment shown in FIG. 15 will be described below. The base-side temporary fixing mechanism 42v has a cylindrical base end-side fitting portion 421v protruding from the center of the base-side power feeding surface 413v, and a base end side so as to have a columnar shape having a width smaller than that of the base end-side fitting portion 421v. A base-side insertion part 422v formed continuously with the fitting part 421v is provided, and a tip-side fitting part 423v is provided on the tip side of the base-side insertion part 422v. In this embodiment, the hook-shaped engaged portion 425v is formed so as to straddle the base side insertion portion 422v and the distal end side fitting portion 423v.

  The holder-side temporary fixing mechanism 53v inserts a base-side fitting recess 531v formed at the center of the holder-side power feeding surface 516v and a base-side insertion portion 422v for fitting with the base-side fitting portion 421v. For this reason, the holder side inserted portion 532v having the same width as the base end side fitting concave portion 531v and the distal end side having a width smaller than the holder side inserted portion 532v for fitting the distal end side fitting portion 423v are fitted. A fitting recess 533v is formed.

  The embodiment shown in FIG. 16 will be described below. The base side temporary fixing mechanism 42w includes a base end side fitting portion 421w that protrudes from the center of the base side feeding surface 413w and a base end side fitting portion 421w through a taper portion 421m that gradually decreases in width toward the distal end side. And a base side insertion portion 422w formed in a columnar shape having a width smaller than that of the base end side fitting portion 421w, and a distal end side fitting portion 423w having the same width as the base side insertion portion 422w. The taper portion 423m has a width that gradually decreases toward the distal end side continuously from the distal end side fitting portion 423w, and is formed in a columnar shape having a smaller width than the distal end side fitting portion 423w continuously from the tapered portion 423m. And a front end portion 424w. In this embodiment, the hook-shaped engaged portion 425w is formed so as to straddle the base side insertion portion 422w, the distal end side fitting portion 423w, and the taper portion 423m.

  The holder-side temporary fixing mechanism 53w inserts a base-side fitting recess 531w formed in the center of the holder-side power feeding surface 516w and a base-side insertion portion 422w for fitting the base-side fitting portion 421w. For this reason, the holder side inserted portion 532w having a larger width than the proximal end side fitting recessed portion 531w and the distal end side having a smaller width than the holder side inserted portion 532w for fitting the distal end side fitting portion 423w And a fitting recess 533w.

  The form shown in FIG. 17 will be described below. The base-side temporary fixing mechanism 42x includes a columnar base end portion 420x protruding from the center of the base-side power feeding surface 413x, and a base end-side fitting portion 421x that extends continuously in the width direction from the base end portion 420x. The base side insertion portion 422x formed continuously to the base end side fitting portion 421x so as to have a columnar shape smaller than the base end side fitting portion 421x, and the width direction continuous to the base side insertion portion 422x The front end side fitting part 423x which spreads in a bowl shape is provided. In this embodiment, the hook-shaped engaged portion 425x is formed so as to straddle the base side insertion portion 422x and the distal end side fitting portion 423x.

  The holder-side temporary fixing mechanism 53x is the same as the proximal-side fitting concave portion 531x for fitting the proximal-side fitting portion 421x and the proximal-side fitting concave portion 531x for inserting the base side insertion portion 422x. A holder-side inserted portion 532x having a width of 5 mm and a tip-side fitting recessed portion 533x having a width smaller than that of the holder-side inserted portion 532x for fitting the tip-side fitting portion 423x.

  According to the embodiment shown in FIGS. 15 to 17, substantially the same effect as that of the embodiment shown in FIGS. 4 and 5 can be expected.

1 shows a light source device having a discharge lamp holding mechanism according to the present invention. 1 shows a discharge lamp according to the present invention. 1 shows a light source device having a discharge lamp holding mechanism according to the present invention. 1 shows a base according to the present invention. 1 shows a lamp holder according to the present invention. The procedure for fixing the base and the lamp holder according to the present invention will be described. The procedure for fixing the base and the lamp holder according to the present invention will be described. The procedure for fixing the base and the lamp holder according to the present invention will be described. The procedure for fixing the base and the lamp holder according to the present invention will be described. The procedure for fixing the base and the lamp holder according to the present invention will be described. An explanation will be given of the operation of the discharge lamp holding mechanism according to the present invention. An explanation will be given of the operation of the discharge lamp holding mechanism according to the present invention. An explanation will be given of the operation of the discharge lamp holding mechanism according to the present invention. 6 shows a discharge lamp holding mechanism according to a comparative example. 6 shows another embodiment of a discharge lamp holding mechanism according to the present invention. 6 shows another embodiment of a discharge lamp holding mechanism according to the present invention. 6 shows another embodiment of a discharge lamp holding mechanism according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Discharge lamp 11 Arc tube part 12 Sealing part 13 Anode 14 Cathode 20 Reflection mirror 4 Base 41 Base side base part 411 Base side body part 412 Base side flange part 413 Base side feeding surface 414 Base side screw part 415 Recess 416 Concave Location 42 Base side temporary fixing mechanism 421 Base end side fitting part 422 Base side insertion part 423 Tip side fitting part 425 Engagement part 5 Lamp holder 51 Holder side base part 511 Holder side trunk part 512 Holder side flange part 514 Mark 516 Holder-side feeding surface 517 Rotation suppressing body 52 Rotating body 521 Rotating main body portion 522 Rotating diameter-reducing portion 525 Holder-side screw portion 53 Holder-side temporary fixing mechanism 531 Proximal-side fitting recess 532 Holder-side inserted portion 533 For distal-side fitting Recess

Claims (6)

It comprises a discharge lamp having a base attached to at least one end, and a lamp holder that suspends the discharge lamp and holds it so that it can be detached.
A base of the discharge lamp extends along the tube axis of the discharge lamp and is mounted so as to cover an end of the discharge lamp, and a width in a direction perpendicular to the tube axis from the base side of the base And a base-side temporary fixing mechanism that protrudes from the front end surface of the base-side base portion and extends along the tube axis toward the lamp holder, and an outer peripheral surface on the front-end side of the base-side base portion. With the formed base side fixed mechanism,
The lamp holder is engaged with the base-side main fixing mechanism, and a holder-side base portion having a holder-side temporary fixing mechanism including a recess extending along the tube axis for engaging with the base-side temporary fixing mechanism. A cylindrical holder-side main fixing mechanism that is provided on the outer peripheral surface of the holder-side base portion and rotates in the circumferential direction around the holder-side base portion,
The base and the lamp holder are temporarily fixed by engaging the base side temporary fixing mechanism and the holder side temporary fixing mechanism, and the base side main fixing mechanism and the holder side main fixing mechanism are A discharge lamp holding mechanism that is fixed by being engaged,
The base-side temporary fixing mechanism is formed with a proximal-side fitting portion and a distal-side fitting portion at two locations separated in the tube axis direction, and the proximal-side fitting portion and the distal-side fitting portion. A base side insertion part is formed between the joint part,
The holder-side temporary fixing mechanism includes a proximal-side fitting recess for fitting into the proximal-side fitting portion and the distal-side fitting portion at two locations spaced in the central axis direction of the lamp holder. And a distal-side fitting recess, and a holder-side inserted portion for inserting the base-side insertion portion is formed between the proximal-side fitting recess and the distal-side fitting recess. ,
The discharge lamp holding mechanism, wherein the base and the lamp holder satisfy the relationship shown in the following relationship 1.
(Relationship 1)
The difference between the width in the direction perpendicular to the center axis of the lamp holder in the proximal end fitting recess and the width in the direction perpendicular to the tube axis of the distal fitting part is A,
The difference between the width in the direction perpendicular to the central axis of the lamp holder in the concave portion for fitting on the base end side and the width in the direction perpendicular to the tube axis of the base side insertion portion is B,
The difference between the width in the direction perpendicular to the center axis of the lamp holder in the holder side inserted portion and the width in the direction perpendicular to the tube axis of the tip side fitting portion is C,
The difference between the width in the direction perpendicular to the central axis of the lamp holder in the holder side insertion portion and the width in the direction perpendicular to the tube axis in the base side insertion portion is D,
The difference between the width in the direction perpendicular to the center axis of the lamp holder in the concave portion for fitting on the base end side and the width in the direction orthogonal to the tube axis in the base end side fitting portion is E,
When the difference between the width in the direction perpendicular to the central axis of the lamp holder in the concave portion for fitting on the tip side and the width in the direction perpendicular to the tube axis in the fitting portion on the tip side is F,
Any of A through D is greater than both E and F. The holder-side temporary fixing mechanism is formed with an engaging portion extending in a convex shape toward the central axis of the holder-side base portion in a direction perpendicular to the tube axis of the discharge lamp,
The base-side temporary fixing mechanism has an engaged portion formed of a bowl-shaped recess that is recessed toward the central axis of the base-side base portion for engaging with the engaging portion. The discharge lamp holding mechanism according to claim 1. The base side main fixing mechanism has a base side screw portion formed on the outer peripheral surface on the tip side of the base side base portion.
The discharge lamp holding mechanism according to claim 1, wherein the holder side main fixing mechanism has a holder side screw portion formed on an inner peripheral surface thereof.   The base and the lamp holder are made of a conductive member, and the base and the lamp holder are permanently fixed in a state where the distal end surface of the base side of the base and the base end surface of the holder side base are in contact with each other. The discharge lamp holding mechanism according to claim 1, wherein an electric power feeding mechanism is formed. The lamp holder is formed with a rotation suppressing body that protrudes from the base end surface of the holder-side base portion toward the base-side base portion,
2. The discharge lamp holding mechanism according to claim 1, wherein a recess for engaging with the rotation suppressing body is formed in a distal end surface of the base-side base portion in the base.   The discharge lamp holding mechanism according to claim 1, wherein the discharge lamp has a rated current of 50 A or more.

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