JP6029387B2 - Discharge lamp attachment / detachment mechanism - Google Patents

Description

The present invention relates to a discharge lamp attaching / detaching mechanism .

  A short arc type discharge lamp (hereinafter referred to as a discharge lamp) has caps (conducting metal fittings) coaxially positioned at both ends of the arc tube. One base is a fixed base that is fixed to a lamp fixing base of an illumination device (for example, an exposure apparatus) via a lamp attaching / detaching mechanism, and the other base is a free base to which a conductive lead wire is connected. When a discharge voltage is applied between the lamp fixing base and the lead wire (that is, between the pair of caps), a discharge is generated between the anode and the cathode (bright spot) in the arc tube, and illumination light is generated.

In this illuminating device, it is preferable to fix both of the lamp base and the lamp fixing base in a state where no minute gap is generated. When the gap is generated, abnormal discharge occurs between the gaps, and the life of the discharge lamp or the lamp fixing base is shortened. Further, when rattling (play) occurs due to the gap, the position of the bright spot fluctuates, and illumination light with a designed light intensity and distribution cannot be obtained.

  The direction of the discharge lamp relative to the lamp fixing base (rotational position about the lamp axis) must also be maintained at a specific position. If the direction of the discharge lamp with respect to the lamp fixing base cannot be maintained within a certain range, stress is applied to the discharge lamp via the lead wire coming out from the free cap, causing damage (explosion).

JP 2003-45219 A JP 2003-297228 A JP 2007-273168 A JP 2008-305615A JP 2010-232183 A

  Conventionally, various discharge lamp attaching / detaching mechanisms have been proposed (Patent Documents 1 to 5). However, none of these methods are satisfactory from the viewpoints of easy attachment / detachment operation (rapidity) and prevention of abnormal discharge.

An object of the present invention is to provide a discharge lamp attachment / detachment mechanism with a new idea that can perform attachment / detachment operation simply (rapidly) and can prevent abnormal discharge well.
Another object of the present invention is to provide a discharge lamp attaching / detaching mechanism that can easily limit the direction of the discharge lamp to a certain (range).

The discharge lamp attaching / detaching mechanism according to the present invention includes a contact end surface to the lamp fixing base, a contact shaft extending in an axial direction from the contact end surface, and a contact shaft extending from the contact end surface integrally with the contact shaft. The lamp fixing base that supports the fixed base is provided with a lamp support hole having a size that allows the towed protrusion and the contact shaft to pass therethrough and does not pass through the contact end surface. A pair of opening and closing legs that engage with the towed protrusion of the fixed base that has been inserted and press the contact end surface against the lamp fixing base via the towed protrusion, and an opening and closing leg locking mechanism that fixes the pair of opening and closing legs in the closed position And the pair of opening / closing legs pivots about an axis parallel to the axis of the discharge lamp, moves along a direction perpendicular to the axis of the discharge lamp, and opens and closes. Opening Each of the leg and the towed projection of the discharge lamp is formed with a tapered surface that, when the pair of opening and closing legs are closed, makes a surface contact with each other and applies a force in a direction to press the contact end surface against the lamp fixing base. It is characterized by that.

The tapered surfaces of the pair of opening / closing legs and the towed projection of the discharge lamp may be formed so as to apply a force in the direction of pressing the outer peripheral surface of the contact shaft against the inner wall of the lamp support hole when the pair of opening / closing legs is closed. it can.

  In one embodiment, the tapered surface is provided so as to restrict the moving direction of the contact shaft within the lamp support hole to a specific direction.

In another embodiment, the tapered surfaces of the pair of opening and closing legs and the towed projection of the discharge lamp do not contact the outer peripheral surface of the contact shaft and the inner wall of the lamp support hole when the pair of opening and closing legs are closed. The contact shaft can be formed so as to determine the position in the lamp support hole.

  In any of the embodiments, the outer peripheral surface of the contact shaft of the discharge lamp and the inner wall of the lamp support hole of the lamp fixing base are engaged with each other to determine the position in the rotation direction around the axis of the discharge lamp. It is preferable to provide a non-arc portion.

According to the discharge lamp attaching / detaching mechanism according to the present invention, the contact end surface of the discharge lamp can be pressed against the lamp fixing pedestal by closing the opening / closing leg supported by the lamp fixing pedestal, so that the discharge lamp attaching / detaching operation can be performed quickly and easily. Abnormal discharge can be prevented.

It is a front view which shows the whole illuminating device which has the discharge lamp attachment / detachment mechanism by this invention. It is a top view in the state where an opening-and-closing leg was opened showing one embodiment of a discharge lamp attaching and detaching mechanism by the present invention. It is a top view of the state which closed and locked the opening-and-closing leg. It is sectional drawing which follows the IV-IV line of FIG. (A), (B) is sectional drawing which shows the other example of the cross-sectional shape (taper shape) of the towed protrusion of a discharge lamp, and a pair of opening-and-closing leg. (A), (B) is the top view which shows another embodiment of the discharge lamp attachment / detachment mechanism by this invention, the top view which shows the example of a shape of a lamp support hole and a discharge lamp contact axis, and the perspective view around a discharge lamp contact axis. is there. It is a top view which shows another example of the discharge lamp attachment / detachment mechanism by this invention, and shows the example of a shape of a lamp support hole and a discharge lamp contact shaft. It is a top view which shows the shape example of the lamp | ramp support hole and discharge lamp contact shaft which shows other embodiment of the discharge lamp attachment / detachment mechanism by this invention. It is a top view which shows the shape example of a lamp support hole and the discharge lamp contact shaft which shows other embodiment of the discharge lamp attachment / detachment mechanism by this invention. It is a top view which shows other embodiment of the discharge lamp attachment / detachment mechanism by this invention. It is a top view which shows other embodiment of the discharge lamp attachment / detachment mechanism by this invention.

  FIG. 1 shows an entire illumination apparatus having a discharge lamp attaching / detaching mechanism according to the present invention. The discharge lamp 10 includes a base (conducting metal fitting) 12 and a base 13 at both ends of the arc tube 11. In the arc tube 11, an anode 12a and a cathode 13a that are connected to a cylindrical base 12 and a base 13 are located, and a bright spot during discharge is formed between the anode 12a and the cathode 13a. The bright spot is formed (occurs) on an axis passing through the axis of the cylindrical base 12 and the base 13. A line segment passing through the axis of the base 12 and the base 13 is defined as an axis of the discharge lamp 10. The base 12 of the discharge lamp 10 is a fixed base that is attached to and detached from the housing 20 of the lighting device via an attaching / detaching mechanism 21, and the base 13 is a free base to which a conductive lead wire 14 is connected. The lighting device housing 20 is provided with a reflecting mirror 22.

  The fixed base 12 of the discharge lamp 10 is made of a conductive material, for example, brass. As shown in FIG. 2, the fixed base 12 has a contact end face 16 perpendicular to the axis and a center of the contact end face 16. An extending contact shaft 17 and a towed protrusion 19 formed integrally with the contact shaft 17 through a small diameter portion 18 and spaced apart in the axial direction are provided. The to-be-towed projection 19 has a rotationally symmetric shape about the axis, and has a truncated conical surface portion (tapered surface portion) 19t that gradually decreases in diameter on the contact end face 16 side.

  The attachment / detachment mechanism 21 includes a lamp fixing base 24 to which a lead wire 23 is connected, and a lamp support hole 25 is formed in the lamp fixing base 24. The lead wire 23 is not drawn in FIG. On the lamp fixing base 24 (illuminating device housing 20), a pair of opening / closing legs 26 is pivotally mounted so as to be openable / closable by a shaft 26a symmetrically via a dividing line 25a passing through the center of the lamp support hole 25. . The pair of opening / closing legs 26 includes a tapered surface portion 26 t that engages with the truncated conical surface portion 19 t of the towed protrusion 19. An opening / closing leg locking mechanism 27 that locks the pair of opening / closing legs 26 in a closed state is provided at the end of the pair of opening / closing legs 26 opposite to the shaft 26a. The open / close leg lock mechanism 27 includes a lock arm portion 27a provided on one open / close leg 26, and a lock lever 27d provided on the other open / close leg 26 so as to be able to be tilted about a shaft 27c, on the lock lever 27d. The one end of the lock ring 27f is pivotally attached to the shaft 27e. The other end lock portion 27g of the lock ring 27f is engaged with and disengaged from the lock arm portion 27a. When the lock lever 27d is tilted in the lock direction X while the other end lock portion 27g is hung on the lock arm portion 27a, the lock ring 27f is locked. When the lock lever 27d is raised in the unlocking direction, the lock is released. Such snap lock mechanisms are well known.

The lamp support hole 25, the pair of opening / closing legs 26, the fixed base 12 (contact end surface 16), the contact shaft 17, the small diameter portion 18, and the towed projection 19 of the attaching / detaching mechanism 21 are each dimensioned to satisfy the following conditions. And the position is determined.
1) The lamp support hole 25 is sized such that the towed protrusion 19 and the contact shaft 17 can be inserted, and the fixed base 12 (contact end surface 16) cannot be inserted. The back surface (surface on the fixed base 12 side) 24s of the lamp fixing base 24 and the contact end surface 16 are always in surface contact regardless of the positions of the lamp support hole 25 and the fixed base 12 in the direction perpendicular to the axis.
2) When the pair of opening / closing legs 26 is rotated around the shaft 26a in the direction of arrow A in FIGS. 2 and 4 with the contact shaft 17 or the towed projection 19 inserted through the lamp support hole 25, the taper is tapered. The surface portion 26t is engaged with the truncated conical surface portion 19t of the towed projection 19 to generate a force (arrow B in FIG. 4) on the fixed base 12 on the lamp fixing base 24 side. As a result, the rear surface 24s of the lamp fixing base 24 is A contact pressure is generated between the fixed end 12 and the contact end face 16.
3) When the pair of opening / closing legs 26 is rotated and closed about the shaft 26a, simultaneously, a force (arrow C in FIG. 2) acts on the to-be-driven projection 19 (fixed base 12) in the direction perpendicular to the axis line. A contact pressure is generated between a part of the outer peripheral surface of the lamp and a part of the inner wall of the lamp support hole 25. 2 and 3, the contact shaft 17 and the towed protrusion 19 are drawn to the same diameter.
4) When the pair of open / close legs 26 are locked in the closed state by the open / close leg locking mechanism 27, the contact (contact) state between the back surface 24s of the lamp fixing base 24 and the contact end face 16 of the fixed base 12 and the contact The contact (contact) state between a part of the peripheral surface of the shaft 17 and a part of the inner wall of the lamp support hole 25 is maintained. 3 and 4 show a state in which the pair of opening / closing legs 26 are closed and locked by the lock mechanism 27. FIG. As described above, the close contact relationship between the lamp fixing base 24 and the contact end face 16 and the contact shaft 17 of the fixing base 12 is maintained, so that abnormal discharge between the lamp fixing base 24 and the fixing base 12 is prevented. In FIG. 3, the pair of opening / closing legs 26 are drawn in parallel, but this is because the force in the direction orthogonal to the axis (the arrow C in FIG. 2) acts on the towed projection 19, and the outer peripheral surface of the contact shaft 17 is uniform. This is because the opening / closing leg 26 is further closed by the elasticity of the lock mechanism 27 after a sufficient contact pressure is generated between the lamp portion and a part of the inner wall of the lamp support hole 25.

  The position of the shaft 26a of the pair of opening / closing legs 26, the diameter of the fixed base 12, and the lengths of the contact shaft 17 and the small-diameter portion 18 must be considered in order to obtain the above effects. That is, the position of the shaft 26a of the pair of opening / closing legs 26 is such that when the pair of opening / closing legs 26 is closed, a sufficient moving force in the direction orthogonal to the axis (direction of arrow C) acts on the towed projection 19 (fixed base 12). The diameter of the fixed base 12 is determined so that the back surface 24s of the lamp fixing base 24 and the contact end surface 16 are in contact with each other with a sufficient contact area, and the length of the contact shaft 17 and the small diameter portion 18 is a pair of opening and closing. The leg 26 is determined so that the axial movement force B and the axial orthogonal movement force C act on the towed projection 19 (fixed base 12).

  In the above embodiment, the pair of opening / closing legs 26 has a "C" shape in which the shaft 26a side is closer to the opening / closing leg lock mechanism 27 side, but may be arranged in a "reverse C" shape. Good. Further, the pair of opening / closing legs 26 may pivot on the same axis. Furthermore, in the above embodiment, the tapered surface that engages with each other is formed on both the to-be-towed projection 19 and the opening / closing leg 26, but the present invention can be realized even if the tapered surface is formed on only one of them. FIG. 5A shows an example in which a corner portion 26c that contacts the truncated conical surface portion 19t of the towed projection 19 is formed by eliminating the tapered surface on the opening and closing leg 26 side, and FIG. This is an example in which the corner portion 19c that contacts the tapered surface portion 26t of the opening / closing leg 26 is formed by eliminating the tapered surface.

  FIG. 6 shows that the contact shaft 17 of the discharge lamp 10 and the lamp support hole 25 of the lamp fixing base 24 are engaged with each other in order to determine the position in the rotational direction around the axis of the discharge lamp 10 (cap 12). In this embodiment, a concave portion (non-arc portion, a shape different from the circular arc of the circular lamp support hole 25) 17r and a convex portion (non-arc portion) 25p are defined. 6B shows the shape of the discharge lamp 10 around the contact shaft 17, and FIG. 6A shows the relationship between the concave portion 17r of the contact shaft 17 and the convex portion 25p of the lamp support hole 25. FIG. The convex portion 25p of the lamp support hole 25 is formed on the symmetrical center line of the pair of opening / closing legs 26 (partition line 25a passing through the center of the lamp support hole 25), and the concave portion 17r of the discharge lamp contact shaft 17 is convex. When engaged with the portion 25p, it is formed at a position that does not cause harmful stress to the discharge lamp 10 via the lead wire 14.

  The shapes of the non-arc portion 17r of the contact shaft 17 of the discharge lamp 10 and the non-arc portion 25p of the lamp support hole 25 of the lamp fixing base 24 have a degree of freedom. In short, it is sufficient that the contact shaft 17 and the lamp support hole 25 have non-arc portions that can restrain the rotation of the discharge lamp 10 in the lamp support hole 25. FIG. 7 shows that a part of the inner surface of the lamp support hole 25 is a plane 25 f orthogonal to the symmetrical center line of the pair of opening and closing legs 26 (partition line 25 a passing through the center of the lamp support hole 25). The example which formed the plane 17f engaged with this plane 25f is shown. Further, in FIG. 8, the lamp support hole 25 is composed of a square hole including a plane 25f perpendicular to the symmetry center line of the pair of opening / closing legs 26 (partition line 25a passing through the center of the lamp support hole 25). In this example, a convex portion 25p is formed on the discharge lamp contact shaft 17, and a flat surface 17f that engages with the flat surface 25f and a concave portion 17r that engages with the convex portion 25p are formed. Further, FIG. 9 shows a protrusion 25p of the lamp support hole 25 and a recess of the contact shaft 17 positioned on the opposite side of the moving direction of the contact shaft 17 (discharge lamp 10) by the pair of opening and closing legs 26 to be closed. This is an example in which 17r is formed.

  In FIG. 10, the contact shaft 17 is moved in a specific direction (C direction) of the lamp support hole 25 by the tapered surface portion 26 t of the pair of opening / closing legs 26 and the tapered surface portion 19 t ′ formed on the towed protrusion 19. It is an embodiment. In FIG. 10, the contact shaft 17 is drawn with a larger diameter than the towed protrusion 19. The tapered surface portion 19t ′ of the towed projection 19 is formed symmetrically in a plane “C” shape on the hatched portion, and the towed projection 19 (contact shaft 17) by the force of closing the pair of opening and closing legs 26. ) Acts on the lamp support hole 25 in the direction of arrow C. That is, the symmetrically tapered surface portion 19t ′ of the towed protrusion 19 restricts the moving direction of the contact shaft 17 (discharge lamp 10) within the lamp support hole 25, and therefore the contact shaft 17 and the lamp support hole 25 are rotated. There is no need to provide a non-arc part for regulating the direction.

  FIG. 11 shows an embodiment in which a pair of open / close legs 26 is formed with a planar semicircular arc taper surface portion 26t 'that engages with the frustoconical surface portion 19t of the towed protrusion 19 and exhibits a centering function. In FIG. 11, the contact portion between the truncated conical surface portion 19t and the flat semicircular arc tapered surface portion 26t 'is hatched. According to this embodiment, the position of the contact shaft 17 in the lamp support hole 25 (that is, the position of the bright spot of the discharge lamp) without bringing the outer peripheral surface of the contact shaft 17 into contact with the inner wall of the lamp support hole 25. Can be determined. In this embodiment as well, as in the embodiment of FIG. 6, a recess (non-arc portion) that engages with the outer peripheral surface of the contact shaft 17 and the inner wall of the lamp support hole 25 to determine the position in the same rotational direction. And a convex part (non-arc part) can be formed.

  The open / close leg locking mechanism 27 of the embodiment that locks the pair of open / close legs 26 in a closed state shows an example. The present invention does not ask | require the specific structure of an opening-and-closing leg lock mechanism.

10 discharge lamp 11 arc tube 12 base (fixed base)
13 Base (free base)
14 Lead wire 16 Contact end surface 17 Contact shaft 17r Concave portion (non-arc portion)
17f plane (non-arc part)
18 Small-diameter portion 19 Towed protrusion 19t truncated conical surface portion (tapered surface portion)
19t 'Tapered surface portion 19c Corner portion 20 Illuminating device housing 21 Attaching / detaching mechanism 22 Reflecting mirror 23 Lead wire 24 Lamp fixing base 24s Back surface 25 Lamp support hole 25a Dividing line 25r Concave portion (non-arc portion)
25f plane (non-arc part)
26 Opening / closing leg 26a Shaft 26t Tapered surface part 26t 'Flat semicircular arc taper surface part 26c Corner part 27 Opening / closing leg lock mechanism

Claims (5)

In a discharge lamp attaching / detaching mechanism for attaching and detaching one fixed base of a discharge lamp having a base located coaxially at both ends of the arc tube to a lamp fixing base,
A contact end surface to the lamp fixing base, a contact shaft extending in an axial direction from the contact end surface, and a towed protrusion formed on the contact shaft so as to be separated from the contact end surface, integrally formed with the fixed base of the discharge lamp. ;
A lamp support hole formed in a lamp fixing base that supports the fixed base and having a size that allows the towed protrusion and the contact shaft to pass therethrough and does not pass through the contact end surface;
A pair of opening and closing legs that engage with a towed protrusion of a fixed base inserted into the lamp support hole and press the contact end surface against the lamp fixing base via the towed protrusion; and the pair of opening and closing legs fixed in a closed position Open / close leg locking mechanism;
I have a,
The pair of open / close legs pivots about an axis parallel to the axis of the discharge lamp, moves along a direction perpendicular to the axis of the discharge lamp, and opens and closes; and
Each of the pair of opening / closing legs and the towed projection of the discharge lamp has a tapered surface that applies a force in a direction in which the contact end surface is pressed against the lamp fixing base when the pair of opening / closing legs is closed. Being formed,
A discharge lamp attaching / detaching mechanism characterized by the above. 2. The discharge lamp attaching / detaching mechanism according to claim 1 , wherein when the pair of opening / closing legs is closed , the tapered surfaces of the pair of opening / closing legs and the towed projection of the discharge lamp are arranged so that the outer peripheral surface of the contact shaft is the inner wall of the lamp support hole. A discharge lamp attaching / detaching mechanism formed so as to apply a force in a direction of pressing against the discharge lamp.   3. The discharge lamp attaching / detaching mechanism according to claim 2, wherein the tapered surface is provided so as to regulate a moving direction of the contact shaft in the lamp support hole in a specific direction. 2. The discharge lamp attaching / detaching mechanism according to claim 1, wherein the pair of opening and closing legs and the tapered surface of the towed projection of the discharge lamp have an outer peripheral surface of the contact shaft and an inner wall of the lamp support hole when the pair of opening and closing legs are closed. A discharge lamp attaching / detaching mechanism formed so as to determine the position of the contact shaft in the lamp support hole without contacting the contact shaft.   5. The discharge lamp attaching / detaching mechanism according to claim 1, wherein an outer peripheral surface of the contact shaft of the discharge lamp and an inner wall of the lamp support hole of the lamp fixing base are engaged with each other to discharge. A discharge lamp attaching / detaching mechanism in which a non-arc portion that defines a position in a rotation direction about the axis of the lamp is formed.

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