JP4877925B2 - Stage equipment - Google Patents

Description

  The present invention relates to a stage apparatus, and more particularly, to a stage apparatus configured to be able to rotate a θ table more stably and precisely.

  For example, a stage apparatus has a Y stage that moves in the Y direction and an X stage that moves in the X direction, and the Y stage guides the movement direction along a pair of Y direction guide rails fixed on a surface plate. Then, the X stage is guided in the moving direction along the X direction guide rail mounted on the Y stage (see, for example, Patent Document 1).

  In a stage apparatus used for moving a semiconductor wafer, sliders provided at both ends of the Y stage are translated in the Y direction by a linear motor, and a θ table on which the wafer is placed on the X stage is in the θz direction. Is rotatably supported.

In this type of stage device, when a wafer as an object is transported and held on the θ table, the θ table is rotated in the θz direction around the Z axis to position the wafer with high accuracy. Positioning control for adjusting the position of the wafer is performed.
JP 2004-317485 A

  In the above-described conventional stage apparatus, since all the loads on the θ table are received by the X table at the support portion that rotatably supports the θ table, for example, when the Y stage rotates due to distortion of the guide rail, the friction force As a result, the θ table also rotates, and there is a problem that it is difficult to stably and precisely control the rotation position of the θ table.

  Therefore, in view of the above circumstances, an object of the present invention is to provide a stage apparatus that solves the above problems.

  In order to solve the above problems, the present invention has the following means.

The present invention also includes a stage that moves on a surface plate,
A θ table rotatably supported on the stage;
A pivot shaft that stands vertically between the center of the upper surface of the stage and the center of the lower surface of the θ table;
A bearing for bearing the pivot shaft such that the θ table rotates about the axis of the pivot shaft;
A pair of θ linear motors provided on the sides of the θ table and driving side surfaces of the θ table around the axis of the pivot shaft;
A plurality of struts formed extending in the hanging direction from the lower surface of the θ table;
An air pad that floats and moves on the stage by air pressure at the lower end of the column;
With
The θ table is supported by the pair of θ linear motors so as to rotate on the stage around the pivot shaft in a non-contact manner.

The present invention also includes a stage that moves on a surface plate,
A θ table rotatably supported on the stage;
A pivot shaft that stands vertically between the center of the upper surface of the stage and the center of the lower surface of the θ table;
A bearing for bearing the pivot shaft such that the θ table rotates about the axis of the pivot shaft;
A pair of θ linear motors provided on the sides of the θ table and driving side surfaces of the θ table around the axis of the pivot shaft;
A plurality of struts formed extending in the hanging direction from the lower surface of the θ table;
An air pad that floats and moves on the surface plate by air pressure at the lower end of the column;
With
The θ table is supported by the pair of θ linear motors so as to rotate on the stage around the pivot shaft in a non-contact manner.

  The bearing may be a cross roller bearing that supports the outer periphery of the upper end or the lower end of the pivot shaft.

  The stage has a Y stage that moves in the Y direction and an X stage that moves in the X direction orthogonal to the Y direction, and a stator of the θ linear motor is provided on the Y stage, and the θ linear A motor mover is provided on a side surface of the θ table.

  Further, the pivot shaft is supported by a support plate disposed so as to face the lower surface of the θ table, and the support plate is supported via a height adjusting mechanism for adjusting a height position. And

In addition, the height adjusting mechanism is provided on a support column extending in a hanging direction from the lower surface of the θ table, and the height position of the support plate is moved up and down via the support column.

According to the present invention, a pivot shaft that rises vertically between the center of the upper surface of the stage and the center of the lower surface of the θ table, and a bearing that supports the pivot shaft so that the θ table rotates about the axis of the pivot shaft, a pair of θ linear motors provided on the sides of the θ table and driving the side surfaces of the θ table around the axis of the pivot shaft. The θ table is driven on the stage around the pivot axis by driving the pair of θ linear motors. Since the θ table can be rotated with a low load by the bearing, and the θ linear motor can be driven from the side without contact, It is possible to minimize the influence of the stage error on the θ table. In addition, since it has a plurality of pillars extending from the lower surface of the θ table in a hanging direction and an air pad that floats and moves on the stage by air pressure at the lower end of the pillar, when the θ table is rotated, The table can be prevented from swinging around the pivot shaft, and the plane of the θ table can be kept horizontal.

Further, according to the present invention, the θ table can be rotated with a low load by the bearing, and the θ linear motor can be driven from the side without contact with the θ linear motor. And a plurality of struts that extend downward from the bottom surface of the θ table, and a plurality of air pads that float and move on the surface plate by air pressure at the bottom end of the struts Therefore, when the θ table is rotated, the θ table can be prevented from swinging around the pivot shaft, and the plane of the θ table can be kept horizontal.

  Further, according to the present invention, the stator of the θ linear motor is provided on the support portion arranged on the Y stage or on the side of the surface plate, and the mover of the θ linear motor is provided on the side surface of the θ table. When the table is rotated, the θ table can be prevented from swinging around the pivot shaft, and the plane of the θ table can be kept horizontal.

  In addition, according to the present invention, the pivot shaft is supported by the support plate disposed so as to face the lower surface of the θ table, and the height adjustment mechanism for adjusting the height position of the support plate is provided. The moving position can be adjusted stably and with high accuracy, and the height position of the θ table can be adjusted.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing Embodiment 1 of the stage apparatus according to the present invention. FIG. 2 is a front view showing the stage apparatus of the first embodiment. FIG. 3 is a plan view showing the stage apparatus of the first embodiment.

  As shown in FIGS. 1 to 3, the stage apparatus 10 </ b> A is incorporated in, for example, an exposure apparatus used in a semiconductor wafer manufacturing process, and a stage 20 and a stage 30 that moves on the plane of the stage 20. And a θ table 40 mounted on the stage 30 on which a work (not shown) is placed, and a pair of Y linear motors 50 that move the stage 30 in the Y direction.

  The stage 30 protrudes on the plane of the surface plate 20 and moves in parallel along a pair of Y-direction guide rails 28 extending in the moving direction (Y direction), and air pressure on the surface of the surface plate 20. And a plurality of air pads (also called “air bearings”) 34 that float and move. The slider 32 is formed in an inverted U shape so as to face the left and right side surfaces and the upper surface of the Y-direction guide rail 28, and a plurality of air pads (not shown) are provided on each facing surface. Therefore, the slider 32 can be lifted by air pressure with respect to the Y-direction guide rail 28 and moved without contact.

  The stage 30 includes a Y stage 36 that moves in the Y direction and an X stage 38 that moves in the X direction orthogonal to the Y direction. The Y stage 36 is horizontally placed between a pair of Y-direction guide rails 28, and is formed in an H shape to which sliders 32 are coupled at both ends thereof. The X stage 38 is provided so as to move in the X direction between the sliders 32, and a plurality of air pads 34 are provided on the lower surface. The X stage 38 is provided so as to move in the Y direction together with the Y stage 36 and to move in the X direction along the Y stage 36.

  The θ table 40 is formed in a quadrangular shape when viewed from above, and its upper surface 42 serves as a workpiece mounting surface (a wafer mounting surface in the case of a semiconductor exposure apparatus). In the present embodiment, the θ table 40 is formed with dimensions in the X direction and Y direction larger than those of the lower X stage 38, so that a workpiece having a size corresponding to the dimension of the upper surface 42 can be placed. That is, a workpiece (wafer) having a size larger than that of the X stage 38 can be placed on the θ table 40.

  The pair of Y linear motors 50 are juxtaposed on the left and right outer sides of the surface plate 20, and extend in the X direction from the magnet yoke (stator) 52 extending in the Y direction and the outer surface of the slider 32. A coil unit (movable element) 54 is included. The magnet yoke 52 is formed in a U-shape when viewed from the front, and a plurality of permanent magnets are arranged in parallel on the upper and lower surfaces of the inner wall. Further, the magnet yoke 52 is supported by a support member 56 at a height position where the slider 32 moves.

  The coil unit 54 has a plurality of coils connected in the Y direction, and is inserted between the magnets of the magnet yoke 52 from the side. Therefore, when the coil unit 54 is energized, it can form a magnetic flux with respect to the permanent magnet and obtain a thrust in the Y direction with respect to the permanent magnet. The coil unit 54 is coupled to the side surface of the slider 32. Therefore, the Y-direction thrust obtained by the coil unit 54 is applied to the slider 32 and drives the Y stage 36.

  Further, in the stage apparatus 10A, there are four support columns 60 extending downward from the lower surface of the θ table 40, and a plurality of air pads that are provided at the lower end of each support column 60 and float and move on the X stage 38 by air pressure. (Also referred to as “air bearing”) 70. Therefore, the support column 60 and the air pad 70 can move on the X stage 38 while directly supporting the θ table 40.

  Therefore, the θ table 40 can be moved in a non-contact manner on the X stage 38 by the four support columns 60 and the four air pads 70, and with the stage 30 while maintaining the planar accuracy (horizontal accuracy) of the upper surface 42. Can move. Further, in the stage apparatus 10A, since the overall length (length in the height direction) of the support column 60 can be shortened, the stability of the θ table 40 when the X stage 38 is moved can be improved.

  Further, since the four corners of the θ table 40 are supported by the four support columns 60 and the four air pads 70, the θ table 40 can be prevented from swinging with the pivot shaft 80 as a fulcrum when rotating. It becomes possible to maintain accuracy.

  Further, on both the left and right sides of the θ table 40, a pair of θ linear motors 74 that rotate the θ table 40 in the θz direction from the side are provided. The θ linear motor 74 includes a magnet yoke (stator) 76 fixed on the slider 32 and a coil unit (movable element) 78 fixed to the side surface of the θ table 40. The magnet yoke 76 has a U-shaped cross section, and a permanent magnet is attached to the opposing inner surface.

  The magnet yoke 76 is provided on the slider 32 via the support base 79 so as to have the same height as the side surface of the θ table 40. The coil unit 78 is inserted from the side so as not to contact between the permanent magnets of the magnet yoke 76.

  Therefore, the θ linear motor 74 is provided so that the magnet yoke 76 and the coil unit 78 can be relatively rotated in the θz direction when the θ table 40 is rotated in the θz direction.

  Further, the pair of θ linear motors 74 are provided in parallel to positions that are symmetrical about the pivot shaft 80 when viewed from above. Therefore, the pair of θ linear motors 74 energize the coil unit 78 to generate a couple centered on the pivot shaft 80 to rotate the θ table 40 in the θz direction from the side surface.

  FIG. 4 is a side sectional view of the stage 30 and the θ table 40 as viewed from the side. As shown in FIG. 4, between the X stage 38 and the θ table 40, a pivot shaft 80 that rotatably supports the θ table 40 in the θz direction, and a bearing 82 that rotatably supports the pivot shaft 80. And are provided. In the present embodiment, the pivot shaft 80 is provided integrally so as to stand on the upper surface of the X stage 38, and the outer ring of the bearing 82 is provided so as to fit into the recess 40a provided in the center of the lower surface of the θ table 40. The inner ring is fitted to the outer periphery of the upper end of the pivot shaft 80.

  Further, the bearing 82 is composed of, for example, a cross roller bearing in which cylindrical roller spacers are alternately arranged on a rolling surface of a 90 ° V groove via a retainer, so that radial load (radial load), axial load ( Axial load), moment load (pitching / rolling / yaw load), and so on, can be rotated smoothly even when subjected to loads in all directions.

  Therefore, the θ table 40 is supported in a stable state by a pivot bearing structure including the pivot shaft 80 and the bearing 82. Further, the bearing 82 is provided at the center of the lower surface of the θ table 40, and the axis of the pivot shaft 80 coincides with the rotation center of the θ table 40. The thrust of the Y linear motor 50 that drives the stage 30 and the X linear motor described later is also transmitted to the θ table 40 via the pivot shaft 80 and the bearing 82.

  In the pivot bearing structure of the present embodiment, the upper end of the pivot shaft 80 is described as being supported by the bearing 82. However, the present invention is not limited to this, and the pivot shaft 80 is provided at the center of the lower surface of the θ table 40. By providing 82 on the upper surface of the X stage 38, the lower end of the pivot shaft 80 may be supported by the bearing 82.

  Further, since the θ table 40 is rotated about the axis of the pivot shaft 80 (θz direction) by the thrust from the pair of θ linear motors 74 disposed in the vicinity of the pivot shaft 80, the bearing 82 is provided with low friction and vibration. Can be rotated. Since the θ linear motor 74 is a non-contact structure driving means, when the θ table 40 is rotated, the θ table 40 is rotated without being affected by the loss or fluctuation of the driving force due to the transmission path. Thus, the rotation operation of the θ table 40 can be controlled stably and precisely.

  Accordingly, in the stage apparatus 10A, the θ table 40 can be rotated with a low load by the bearing 82, and the θ linear motor 74 can be driven from the lower surface side without contact with the θ table 40. The influence of the error on the θ table 40 can be minimized.

  Further, since the θ table 40 is supported so as to move on the X stage 38 in a non-contact manner by the air pad 70 provided at the lower end of the column 60 described above, the thrust from the pair of θ linear motors 74 is a rotational force. When applied as (couple), it can rotate in the θz direction in a low friction state where only the rotational resistance of the bearing 82 is a load. In the θ linear motor 74, the relative position in the θz direction between the magnet yoke 76 and the coil unit 78 changes according to the rotation angle of the θ table 40, so that a gap corresponding to the maximum rotation angle is separated from the magnet yoke 76. It is formed in the horizontal direction between the coil unit 78 and is configured so that the magnet yoke 76 and the coil unit 78 do not interfere with each other.

  A space 120 through which the Y stage 36 is inserted is formed inside the X stage 38, and an X linear motor 124 that drives the X stage 38 in the X direction is provided in the space 120. Since the Y stage 36 is provided with sliders 32 at both ends and is guided and moved along the guide 28, the Y stage 36 moves in a non-contact manner with the inner wall of the X stage 38.

  The Y stage 36 has a vertical portion 36 a that supports the air pad 122 facing the inner wall of the X stage 38, and a flat portion 36 b to which the X linear motor 124 is attached. Since the air pad 122 faces the inner wall in the Y direction of the space 120 via air pressure, the inner wall of the space 120 can move without contact with the air pad 122 when the X stage 38 is moved in the X direction. Further, when the Y stage 36 is moved in the Y direction, the X stage 38 is moved in the Y direction by pressing the inner wall of the space 120 in the moving direction via the air pressure from the air pad 122. .

  The X linear motor 124 includes a magnet yoke (stator) 126 and a coil unit (movable element) 128 that extend in the X direction. The magnet yoke 126 is formed in a U shape when viewed from the side, and a plurality of permanent magnets are arranged in parallel on the upper and lower surfaces of the inner wall. Further, the magnet yoke 126 is fixed to the flat portion 36 b of the Y stage 36, and the coil unit 128 is supported by a bracket 130 fixed to the inner wall of the X stage 38.

  The coil unit 128 has a plurality of coils arranged in the X direction, and is inserted between the magnets of the magnet yoke 126 from the front. Therefore, when the coil unit 128 is energized, the coil unit 128 can form a magnetic flux and obtain thrust in the X direction with respect to the permanent magnet. Further, since the coil unit 128 is coupled to the X stage 38 via the bracket 130, the X direction thrust obtained by the coil unit 128 is applied to the X stage 38.

  Accordingly, the X stage 38 is driven in the X direction by the thrust from the X linear motor 124. The θ table 40 mounted on the X stage 38 moves in the X direction together with the X stage 38 because the X direction thrust of the X linear motor 124 is transmitted through the pivot shaft 80 and the bearing 82.

  Further, when the X stage 38 moves together with the Y stage 36 in the Y direction, the θ table 40 supported on the X stage 38 via the pivot shaft 80 and the bearing 82 also moves in the X direction and the Y direction, The air pad 70 provided at the lower end of 60 moves in a non-contact manner on the surface plate 20 to maintain the horizontal accuracy of the θ table 40.

  Accordingly, in the stage apparatus 10A, the X table 38 is rotated in the θz direction about the axis of the pivot shaft 80 by the thrust from the pair of θ linear motors 74 input from the left and right side surfaces. Even when an error occurs in the movement position in the Y direction, an increase in error due to the rotation position of the θ table 40 is prevented. Therefore, even when the θ table 40 is rotated in the θz direction after the stage 30 is moved in the Y direction, the mirror 44 provided on the upper surface 42 of the θ table 40 is displaced from the irradiation position of the laser light from the laser interferometer. The position detection accuracy is prevented from being lowered by the laser interferometer. Further, in the stage apparatus 10A, for example, when used in an exposure apparatus, the position of the workpiece (wafer or the like) relative to the optical system is prevented from being shifted due to the rotation position of the θ table 40.

  FIG. 5 is a front view showing the stage apparatus of the second embodiment. FIG. 6 is a side sectional view showing the stage apparatus of the second embodiment. 5 and 6, the same parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 5 and FIG. 6, in the stage apparatus 10 </ b> B, four columns 60 extending in the hanging direction from the lower surface of the θ table 40 and lower ends of the columns 60 are provided on the plane of the surface plate 20. And a plurality of air pads 70 that float and move by air pressure. Therefore, the support 60 and the air pad 70 can move on the surface plate 20 while directly supporting the θ table 40. Therefore, although the θ table 40 has a larger area than the X stage 38, the upper surface of the surface plate 20 is formed by the four columns 60 and the four air pads 70 arranged outside the outline of the X stage 38. Can be lifted by air pressure and moved together with the stage 30 while maintaining the plane accuracy (horizontal accuracy) of the upper surface 42.

  Further, since the four corners of the θ table 40 are supported by the four support columns 60 and the four air pads 70, the θ table 40 can be prevented from swinging with the pivot shaft 80 as a fulcrum when rotating. It becomes possible to maintain accuracy.

  Further, in the stage apparatus 10B, the upper surfaces of the surface plate 20 are supported by the four air pads 34 arranged on the lower surface of the X stage 38 so as to move in a non-contact manner. Therefore, the air pad 34 of the X stage 38 and the air table 70 can move to the θ table 40 without interfering with each other, and the θ table 40 moves together with the X stage 38 while maintaining the planar accuracy of the upper surface 42. can do. Since the air pads 34 and 70 float with respect to the plane of the surface plate 20 by air pressure, they can move in a non-contact manner, and friction when moving the X stage 38 and the θ table 40 is extremely small. Therefore, the thrust during movement can be reduced accordingly.

  Further, the support 60 that supports the θ table 40 is provided with a leveling mechanism 62 that can adjust the height. The leveling mechanism 62 is provided in each of the four support columns 60, and the height is individually adjusted so as to maintain the horizontal accuracy of the θ table 40.

  In the stage apparatus 10B, since the support column 60 and the air pad 70 are disposed outside the X stage 38, the size (upper surface area) of the θ table 40 can be made larger than that of the X stage 38. It becomes possible to mount.

  FIG. 7 is a front view showing the stage apparatus of the third embodiment. FIG. 8 is a side sectional view showing the height adjusting mechanism of the third embodiment. 7 and 8, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7, the stage apparatus 10 </ b> C has a configuration in which a plurality of air pads 70 provided at the lower ends of the respective columns 60 float and move on the X stage 38 by air pressure, as in the first embodiment. It has become. Therefore, the support 60 and the air pad 70 move together with the stage 30 while maintaining the plane accuracy (horizontal accuracy) of the θ table 40 by moving on the X stage 38 while directly supporting the θ table 40.

  Further, in the stage apparatus 10 </ b> C, a pair of Y linear motors 50 are provided on the left and right sides of the surface plate 20. On the slider 32, a θ linear motor 74 supported by a support base 79 is mounted in a vertical state.

  A height adjustment mechanism 200 is provided between the θ table 40 and the X stage 38. The height adjusting mechanism 200 includes a support plate 210 having a pivot shaft 80 and a pair of leveling units 220 that adjust the height position of the support plate 210.

  In the support plate 210, a pivot shaft 80 stands integrally at the center of the upper surface, and air pads 212 that move in a non-contact manner on the lower surface of the θ table 40 are provided at four corners of the upper surface. Therefore, when the rotational force (couple) from the pair of θ linear motors 74 is applied, the θ table 40 can stably rotate in the θz direction with the axis of the pivot shaft 80 as the center of rotation. Become.

  Since the θ linear motor 74 is provided vertically, the coil unit 78 is provided so as to be movable relative to the magnet yoke 76 in the Y direction and upward (Z direction). Therefore, when the θ table 40 is moved up and down by the height adjustment mechanism 200, the magnet yoke 76 of the θ linear motor 74 and the coil unit 78 do not interfere with each other so that the θ linear motor 74 does not hinder the lifting operation of the θ table 40. Is provided.

  As shown in FIG. 8, the leveling unit 220 includes a lower block 230 supported by the air pad 70, an upper block 240 suspended from the lower surface of the support plate 210, and the lower block 230 and the upper block 240. The actuator 250 is provided. The lower block 230 is provided in a direction extending in the Y direction, and a pair of air pads 70 that move on the X stage 38 in a non-contact manner are disposed on the lower surface.

  Further, a pair of inclined portions 232 and a concave portion 234 are provided on the upper portion of the lower block 230. The pair of inclined portions 232 have inclined surfaces having the same direction and the same angle with respect to the horizontal plane, respectively, and are formed in an inclined direction such that the left side is low and the right side is high in FIG.

  In addition, a sliding member 260 that slides with low friction on the lower surface of the support plate 210 is provided on the upper portion of the upper block 240. Further, a pair of inclined portions 242 and a concave portion 244 are provided in the lower portion of the upper block 240. The pair of inclined portions 242 have inclined surfaces having the same direction and the same angle with respect to the horizontal plane, respectively, and are inclined in an inclined direction parallel to the inclined portion 232.

  Further, through holes 246 penetrating in the vertical direction (Z direction) are formed inside the inclined portions 242 of the upper block 240, and the through holes 246 stand above the inclined portions 232. Each of the support columns 270 is inserted. The support column 270 has a rectangular cross-sectional shape, and its upper end faces the lower surface of the support plate 210 but is spaced apart. Each through hole 246 is formed in a rectangular shape that is wide in the Y direction when viewed from above, and is inserted in a state in which the support column 270 is loosely fitted. Therefore, each through hole 246 is configured to be movable in the Y direction with respect to the support column 270.

  The actuator 250 disposed between the concave portion 234 and the concave portion 244 includes, for example, driving means configured to generate a driving force in the Y direction by driving a ball screw mechanism with a motor. Is coupled to the upper block 240, and the right end bracket 254 is coupled to the lower block 230.

  Further, a low friction member 280 that reduces sliding resistance is interposed between the inclined portion 232 and the inclined portion 242. For example, when the driving force of the actuator 250 acts in the direction in which the left end step-252 and the right end step-254 are close to each other, the inclined portion 242 of the upper block 240 is rightward with respect to the inclined portion 232 of the lower block 230. Move to. Therefore, the upper block 240 rises according to the inclination angle of the inclined portions 232 and 242 with respect to the lower block 230 and raises the support plate 210 and the θ table 40.

  In addition, when the driving force of the actuator 250 acts in the direction in which the left end step-252 and the right end step-254 are separated from each other, the inclined portion 242 of the upper block 240 is leftward with respect to the inclined portion 232 of the lower block 230. Move to. Therefore, the upper block 240 descends according to the inclination angle of the inclined portions 232 and 242 with respect to the lower block 230 and lowers the support plate 210 and the θ table 40.

  Therefore, in the stage apparatus 10E, the θ table 40 is rotated in the θz direction by the rotational force (couple) from the pair of θ linear motors 74, and the θ table 40 is driven by the driving direction of the actuator 250 of the height adjustment mechanism 200. It is possible to adjust the height position with respect to the optical system by raising or lowering.

  FIG. 9 is a front view illustrating a stage apparatus according to the fourth embodiment. In FIG. 9, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 9, the stage apparatus 10 </ b> D has a configuration in which a plurality of air pads 70 provided at the lower end of each column 60 move in a non-contact manner on the surface plate 20 as in the second embodiment. Yes. Therefore, the support 60 and the air pad 70 move together with the stage 30 while maintaining the plane accuracy (horizontal accuracy) of the θ table 40 by moving on the surface plate 20 while directly supporting the θ table 40.

  Further, in the stage apparatus 10 </ b> D, a pair of Y linear motors 50 are provided on the left and right sides of the surface plate 20. On the slider 32, a θ linear motor 74 supported by a support base 79 is mounted in a vertical state.

  The height adjusting mechanism 200 (see FIG. 10) is provided between the θ table 40 and the surface plate 20. The height adjusting mechanism 200 includes a support plate 210 having a pivot shaft 80 and a pair of leveling units 220 that adjust the height position of the support plate 210.

  In the support plate 210, the pivot shaft 80 stands integrally at the center of the upper surface, and furthermore, air pads 212 facing the lower surface of the θ table 40 are provided at four corners of the upper surface. Therefore, when the rotational force (couple) from the pair of θ linear motors 74 is applied, the θ table 40 can stably rotate in the θz direction with the axis of the pivot shaft 80 as the center of rotation. Become.

  Therefore, in the stage apparatus 10D, the θ table 40 is rotated in the θz direction by the rotational force (couple) from the pair of θ linear motors 74, and the θ table 40 is driven by the driving direction of the actuator 250 of the height adjustment mechanism 200. It is possible to adjust the height position with respect to the optical system by raising or lowering.

  Since the θ linear motor 74 is provided vertically, the coil unit 78 is provided so as to be movable relative to the magnet yoke 76 in the Y direction and upward (Z direction). Therefore, when the θ table 40 is moved up and down by the height adjustment mechanism 200, the magnet yoke 76 of the θ linear motor 74 and the coil unit 78 do not interfere with each other so that the θ linear motor 74 does not hinder the lifting operation of the θ table 40. Is provided.

  In the above-described embodiment, the configuration in which the θ table 40 is rotatably supported by supporting the outer periphery of the upper end of the pivot shaft 80 with the bearing 82 has been described as an example. Of course, the upper end may be formed in a conical shape or a hemispherical shape, and a bearing corresponding to these tip shapes may be provided.

  In the above-described embodiment, the case where the height adjustment mechanism 200 includes the support plate 210 having the pivot shaft 80 and the pair of leveling units 220 that adjust the height position of the support plate 210 has been described. Of course, not only this but the raising / lowering mechanism of another structure may be used.

It is a perspective view which shows Example 1 of the stage apparatus by this invention. 1 is a front view showing a stage device of Example 1. FIG. 1 is a plan view showing a stage device of Example 1. FIG. FIG. 3 is a side sectional view of the stage 30 and the θ table 40 according to the first embodiment when viewed from the side. It is a front view which shows the stage apparatus of Example 2. FIG. It is a sectional side view which shows the stage apparatus of Example 2. FIG. 6 is a front view showing a stage apparatus of Example 3. 6 is a side sectional view showing a height adjustment mechanism of Embodiment 3. FIG. FIG. 10 is a front view showing a stage apparatus of Example 4.

Explanation of symbols

10A to 10D Stage device 20 Surface plate 28 Y direction guide rail 30 Stage 32 Slider 34, 70 Air pad 36 Y stage 38 X stage 40 θ table 50 Y linear motor 52 Magnet yoke 54 Coil unit 60 Column 74 θ linear motor 76 Magnet yoke 78 Coil unit 80 Pivot shaft 82 Bearing 200 Height adjustment mechanism 210 Support plate 212 Air pad 220 Leveling unit 230 Lower block 240 Upper block 250 Actuators 232, 242 Inclined portion 234, 244 Recessed portion 246 Through hole 270 Post

Claims (6)

A stage that moves on the surface plate,
A θ table rotatably supported on the stage;
A pivot shaft that stands vertically between the center of the upper surface of the stage and the center of the lower surface of the θ table;
A bearing for bearing the pivot shaft such that the θ table rotates about the axis of the pivot shaft;
A pair of θ linear motors provided on the sides of the θ table and driving side surfaces of the θ table around the axis of the pivot shaft;
A plurality of struts formed extending in the hanging direction from the lower surface of the θ table;
An air pad that floats and moves on the stage by air pressure at the lower end of the column;
With
The stage device is supported by the pair of θ linear motors so as to rotate on the stage in a non-contact manner around the pivot shaft . A stage that moves on the surface plate,
A θ table rotatably supported on the stage;
A pivot shaft that stands vertically between the center of the upper surface of the stage and the center of the lower surface of the θ table;
A bearing for bearing the pivot shaft such that the θ table rotates about the axis of the pivot shaft;
A pair of θ linear motors provided on the sides of the θ table and driving side surfaces of the θ table around the axis of the pivot shaft ;
A plurality of struts formed extending in the hanging direction from the lower surface of the θ table;
An air pad that floats and moves on the surface plate by air pressure at the lower end of the column;
With
The stage device is supported by the pair of θ linear motors so as to rotate on the stage in a non-contact manner around the pivot shaft . The bearing, the stage apparatus according to claim 1 or 2, characterized in that a cross roller bearing for journalled an outer periphery of the upper or lower end of the pivot shaft. The stage has a Y stage that moves in the Y direction, and an X stage that moves in the X direction perpendicular to the Y direction,
The θ linear motor stator is provided on the Y stage,
Stage apparatus according to claim 1 or 2, characterized in that a movable element of the θ linear motor to the side of the θ table. The pivot shaft is supported by a support plate arranged to face the lower surface of the θ table,
Said support plate, the stage apparatus according to any one of claims 1 to 4, characterized in that it is supported through a height adjusting mechanism for adjusting the height position. Said height adjusting mechanism, the provided struts formed to extend from the drooping direction underside of θ tables to claim 5, characterized in that raising and lowering the height position of the support plate through said strut The stage apparatus as described.

Images