JP2001297965A - Stage device, projection aligner using stage device, and device manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a vertical stage device, and to drastically, quickly, and accurately carry out positioning without increasing the size of the device. SOLUTION: A Y linear motor 40, a counter mass 61, a pulley 63, and linear motor 80 are provided. The Y linear motor has a stage drive mechanism that moves work stages 20 and 30 that can be freely moved along a reference surface two-dimensionally in a Y direction in the vertical direction. The counter mass 61 is balanced to the weight of the work stages. The pulley 63 winds and supports each belt 62 for interlocking the counter mass 61 to the work stages. The linear motor 80 has a drive mechanism of the counter mass 61. A means for giving a command to the work stages, and a means for giving a command to the counter mass 61 are independently provided. Also, a means is provided, where the means multiplies the speed command of the counter mass 61 by a synchronous error coefficient when the work stages are to be driven in a vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure apparatus used in a lithography process for manufacturing semiconductor devices and the like, various precision processing machines, and a stage apparatus mounted on various precision measuring instruments and the like, and an exposure apparatus using the same. The present invention relates to an apparatus and a device manufacturing method.

[0002]

2. Description of the Related Art Conventionally, an apparatus generally called a stepper is known as an exposure apparatus used for manufacturing a semiconductor device or the like. In this method, a substrate is two-dimensionally moved stepwise with respect to a projection optical system for projecting an original pattern such as a reticle or a mask onto a substrate such as a wafer, and a plurality of original patterns are printed on one substrate. .

A stage device for positioning a substrate such as a wafer by moving it stepwise with respect to a projection optical system of a stepper includes:
As semiconductor devices and the like become more highly integrated, higher accuracy is required.

In recent years, the size of wafers has tended to increase in order to increase the number of device products obtained from one wafer, that is, the number of devices to be obtained, and accordingly stage devices such as steppers have increased in size. And increase the weight. In order to obtain the required accuracy in such a state, it is necessary to further improve the dynamic characteristics of the stage, and it is desired to increase the rigidity of the guide and the like, but this results in a further increase in the weight of the entire stage. . In addition, in order to reduce the cost of semiconductor devices and the like, it is required to shorten the exposure cycle time and improve the throughput, and it is desired that the stage for moving the wafer and the like be driven at high speed. However, to speed up a large and heavy stage,
The rigidity of the structure supporting the stage must be further strengthened, which may significantly increase the size and weight of the entire apparatus and increase the cost.

On the other hand, recently developed X-ray exposure apparatuses using soft X-rays (charged particle storage ring radiation) as exposure light hold substrates such as wafers in a vertical direction, and maintain a vertical or similar standard. A vertical stage that moves two-dimensionally in a plane is used. In such a vertical stage, in addition to the problems associated with the above-mentioned enlargement and speeding up,
Since the stage is moved in the direction of gravity, a counter mass mechanism or the like for compensating the weight of the stage is required.However, if vibration occurs in the counter mass or the like, a disturbance that degrades the positioning accuracy of the wafer or the like is caused. The dynamic characteristics and the like also deteriorate significantly. In addition, the counter mass and the work stage are often connected by a belt via a pulley, and there is a problem in durability of a bearing of the pulley.

FIGS. 18 and 19 show a vertical stage device according to a conventional example. This stage device is a Y stage 112 that can reciprocate in the Y-axis direction (vertical direction) along a surface plate 1110 erected on a plywood 1110a.
0, an X stage 1130 that is reciprocally movable on the Y stage 1120 in the X axis direction, and a Y stage 1120
Cylinder 1140 to move in the axial direction and X stage 1
This is an XY stage having a linear motor (not shown) for moving 130 in the X-axis direction.

The surface plate 1110 has a guide surface for supporting the rear surface of the Y stage 1120 in a non-contact manner via an air pad or the like. Also, one end of the surface plate 1110 has a Y stage 1
An unillustrated Y guide (yaw guide) for guiding the H.120 in the Y-axis direction is provided, and the space between the Y guide and the Y stage 1120 is kept in a non-contact state by an air pad or the like.

[0008] Y stage 1120 and X stage 1130
A self-weight compensation mechanism 1160 for canceling (cancelling) the weight of a wafer or the like (not shown) held therein has a Y end at one end.
A stage 1120, a belt 1162 for hanging a counter mass 1161 on the other end, and a pulley 1 around which the belt 1162 is supported.
163, and the weight of the counter mass 1161 is set so as to balance the weight of the stage movable section including the Y stage 1120 and the X stage 1130 and the wafers and the like held thereon.

[0009]

However, according to the above prior art, when the Y stage 1120 moves at a high speed, the pulley 1163 is also driven to rotate at a high speed, and a large load is applied to its bearing. Also, the stage 112
Since 0, 1130 and the counter mass 1161 are arranged at positions separated from each other with the platen 1110 interposed therebetween, the outer diameter of the pulley 1163 that supports the belt 1162 that connects the two is large. As a result, Y stage 1120
Pulley 11 even if it moves a full stroke from the lower end to the upper end
63 does not make one revolution, and as a result, the stage 11
When the stepping drive 20 is repeatedly performed, a load is repeatedly applied to the same portion of the bearing. If such a situation continues, there is a serious problem that bearings are apt to be worn out, etc., and the durability is remarkably reduced, the positioning accuracy of the stages 1120 and 1130 is deteriorated, and maintenance such as replacement of the bearing requires a large amount of labor. Was.

The present invention has been made in view of the above-mentioned unsolved problems of the prior art, and has been made to improve the durability of a vertical stage provided with a self-weight compensation mechanism such as a counter mass, and to increase the size of the apparatus. It is an object of the present invention to provide a high-performance stage apparatus capable of greatly promoting high-speed and high-accuracy positioning without causing the problem, an exposure apparatus using the same, and a device manufacturing method.

[0011]

In order to achieve the above-mentioned object, the present invention provides a work stage movable along a reference plane, and a stage drive for moving the work stage vertically. A mechanism, a counter stage including a counter mass that balances the weight of the work stage, a connecting member that connects the work stage and the counter mass, a pulley that supports the connecting member, and a vertically moving counter mass. A counter mass drive mechanism for moving along the axis, a first command generation means for giving a command value to the stage drive mechanism, and a second command for giving a command value to the counter mass drive mechanism independently of the first command generation means. Command generation means;
Means for multiplying a speed command value of the counter mass by a synchronization error coefficient when the work stage is driven along the vertical direction. The synchronization error coefficient is determined so as to shift the synchronization between the work stage and the counter stage when the work stage is driven in the up and down direction, and to provide the pulley with a rotational drive amount larger than the moving amount of the work stage. You.

As a result, the time required to reach the target value can be separately controlled by the work stage and the counter stage, and the positional relationship between the work stage and the pulley is slightly shifted when the work stage is driven in the vertical direction. Can rotate the pulley.

Further, the present invention provides a work stage movable along a reference plane, a stage driving mechanism for moving the work stage along a vertical direction, and a counter mass which balances the weight of the work stage. A counter stage that includes the work stage and the counter mass; a pulley that supports the connection member; a counter mass drive mechanism that moves the counter mass along the vertical direction; And means for loosening the tension of the connecting member when the counter mass moves.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a stage device according to the first embodiment of the present invention. This stage device is a Y stage 20 that is reciprocally movable in a Y-axis direction (vertical direction or a vertical direction similar thereto) that is a vertical direction along a surface plate 10 erected on a plywood (not shown).
An X stage 30 reciprocally movable on the Y stage 20 in the X axis direction; a pair of Y linear motors 40 constituting a stage driving mechanism for moving the Y stage 20 in the Y axis direction; And an XY stage having an X linear motor 50 constituting a drive mechanism for moving in the axial direction. In FIG. 1, a Y guide 1 described later is used.
1, the illustration of the left Y linear motor 40 is omitted.

The base 10 has a Y guide surface 1 which is a reference surface for supporting the back surfaces of the Y stage 20 and the X stage 30 in a non-contact manner through an air pad or the like which is a hydrostatic bearing device (not shown).
0a.

A Y guide 11 (shown by a broken line), which is a yaw guide for guiding the Y stage 20 in the Y axis direction, is provided upright at one end of the surface plate 10 in the X axis direction. The space between the Y stages 20 is kept in a non-contact state by an air pad 20a or the like which is a yaw guide static pressure bearing device. When both Y linear motors 40 are driven, the Y stage 20 moves on the XY guide surface 10 a of the base 10 along the Y guide 11.

The Y stage 20 includes a pair of Y sliders 2.
1 and 22 and an X linear motor stator 52 supported at both ends thereof.
The back surfaces of the Y sliders 21 and 22 face the XY guide surface 10a of the surface plate 10, and are supported in a non-contact manner through the air pads and the like as described above. The Y slider 22 on the left side in the figure is longer than the other, and the side surface 22a faces the Y guide surface 1la of the Y guide 11, and is guided in a non-contact manner through the air pad 20a and the like as described above. (See FIG. 2B). The Y sliders 21 and 22 are integrally connected to the Y linear motor mover 41 by the connecting plate 23.

The X stage 30 is a hollow frame having a top plate 31, and an X linear motor stator 52 penetrates the hollow portion. The surface of the top plate 31 holds a wafer, which is a work (not shown), by suction, and forms a part of a work stage. Here, the work stage includes the Y stage 20 and the X stage 30, and is capable of two-dimensionally moving along the reference plane 10a while holding a wafer as a work.

The two Y linear motors 40 are connected to the Y sliders 21 and 21 of the Y stage 20 via the connecting plate 23 as described above.
A Y linear motor mover 41 integrally connected to
There is a Y linear motor stator 42 penetrating the opening.

The current supplied to each Y linear motor stator 42 generates a thrust in the Y axis direction on each Y linear motor mover 41, causing the Y stage 20 and X stage 30
Move in the axial direction. X stage 30 to Y stage 20
The X linear motor mover moved in the X-axis direction
It is fixed inside the top plate 31 of the stage 30.

The current supplied to the X linear motor stator 52 generates a thrust in the X axis direction on the X linear motor mover, and moves the X stage 30 along the Y linear motor stator 52 in the X axis direction. .

A counter mass mechanism 60, which is a self-weight compensation mechanism for canceling (cancelling) the weights of the Y stage 20 and the X stage 30, etc., includes a Y slider 21 and 22 at one end.
A belt 62, which is a plurality of connecting members that suspends the stage 20 and suspends the counter mass 61 at the other end, and pulleys 63 around which the belt 62 is wound and supported at two locations spaced apart in the X-axis direction. The mass of the mass 61 is
And the X stage 30 and the weight of the entire stage movable section including the wafer and the like held thereon.

When the X stage 30 moves in the X axis direction,
Because the position of the center of gravity of the stage movable part including the Y stage 20 and the X stage 30 changes, around the Z axis (in the ωZ axis direction)
The balance of the rotational moments is lost. However, this moment cannot be received only by the countermass mechanism 60, and an excessive load is applied to the Y guide (yaw guide) 11 for guiding the Y stage 20.

In order to support such a large load,
It is necessary to significantly increase the rigidity of the Y guide 11,
Since the rigidity of the Y guide 11 is accompanied by an increase in the size of the Y guide 11 and the like, the entire stage is further increased in size and weight, and the dynamic characteristics of the stage are deteriorated. The result is a great hindrance.

The Y stage 20 and the counter mass 61
In general, a steel belt, a wire, or the like is used as the belt 62 that connects the Y and Y. However, when the Y stage 20 is moved, vibration occurs due to insufficient rigidity of the steel belt. Such vibration significantly deteriorates the positioning accuracy of the stage, and becomes a major obstacle in improving the frequency response characteristics of the positioning control system.

Therefore, an actuator 70 for adjusting the tension or the effective length of the belt 62 in accordance with the displacement of the X stage 30 is provided at the connection between the Y stage 20 and each belt 62.
Is provided. As the actuator 70, a bellofram (air spring) 71 for controlling the tension of the belt 62 as shown in FIG. 4, an air cylinder 72 shown in FIG. 5, a linear motor 73 shown in FIG. 6, or as shown in FIG. A piezoelectric element 74 for changing the effective length of the belt 62 is used. Belt 62 for suspending both Y sliders 21 and 22
The tension or the effective length of each belt 62 is adjusted by individually controlling the drive amounts of the respective actuators 70 based on the position information of the X stage 30 as described later. In this way, by canceling (compensating) the rotational moment generated with the movement of the X stage 30, the load applied to the Y guide 11 by the Y stage 20 is reduced.

In addition, the bellofram 71, the air cylinder 7
The linear motor 73 and the linear motor 73 have a vibration absorbing effect of absorbing and attenuating natural vibration generated due to insufficient rigidity of the belt 62 and natural vibration of the counter mass 61 itself. That is, the vibration transmitted from the belt 62 to the Y stage 20 is reduced by the actuator 70, and the positioning accuracy and
There is also an advantage that the frequency response characteristics of the positioning control system can be greatly improved.

The space between the guide surface 11a of the Y guide 11 and the Y stage 20 (Y slider 22) opposed thereto is kept in a non-contact state by the air pad 20a as described above. The Y stage 20 has a magnetic pad 20b in addition to the air pad 20a. The magnetic pad 20b is for applying a preload in a direction opposite to that of the air pad 20a to obtain a bearing rigidity k1 shown in FIG.

As shown in FIG. 3, a counter mass yaw guide 6 is provided on the back side of the surface plate 10 in parallel with the Y guide 11.
4 are provided, and the counter ma- syo guide 64 is
The counter mass 61 is opposed to an air pad 61a and a magnetic pad 61b which are counter mass yaw guide static pressure bearing devices provided at one end of the counter mass 61.
1 is guided in the Y-axis direction without contact. The magnetic pad 61b of the counter mass 61 is configured to apply a preload in a direction opposite to that of the air pad 61a to obtain a bearing stiffness k2 greater than the bearing stiffness kl of the Y stage 20 as shown in FIG.

The reason why the bearing rigidity k2 of the counter mass yaw guide 64 is made larger than the bearing rigidity kl of the Y guide 11 is that the position of the center of gravity of the Y stage 20 changes as the X stage 30 moves in the X-axis direction. In this case, the counter moment yaw guide 64 receives the influence of the rotating moment generated in the above case, so that the rotating moment applied to the Y stage 20 is reduced.

The positions of the X stage 30 in the Y-axis direction and the X-axis direction are respectively determined by position sensors 30c and 30c which receive the reflected light from the Y length measuring mirror 30a and the X length measuring mirror 30b integrated with the X stage 30, respectively. It is measured by 30d.

Next, FIG.
The case where the bellofram 71 shown in FIG. The bellow ram 71 has a bellows 71b provided with an air supply port 71a, and the upper end of the bellows 71b is connected to a first housing 71c integral with the Y stage 20.
The lower end of b is connected to a second housing 71d connected to the lower end of the belt 62. By changing the pressure of the air supplied to the air supply port 71a, the air pressure in the bellows 71b is changed, thereby changing the tension of the belt 62.

FIG. 8 is a block diagram showing a control system for controlling the air pressure of the bellows 71b based on the position information of the X stage 30 in the X axis direction. A servo system that controls the X linear motor 50 performs X-axis control based on a position command value sent from a computer (not shown) and position information in the X-axis direction of the X stage 30 fed back from the position sensor 30d.
The driving amount of the linear motor 50 is controlled. The position command value is converted by a conversion coefficient kp and transmitted to the controller 70a as control means together with the pressure command value of the bellofram control system, and the servo valve connected to the air supply port 71a of the bellofram 71 is adjusted. Thus, the air pressure in the bellows 71b is controlled.

The position command value of the X stage 30 is converted into a conversion coefficient k.
By multiplying by p and adding the pressure command value of the bellofram control system, the air pressure in each bellofram 71 is changed when the position of the center of gravity of the stage movable section changes, and the tension of each belt 62 is adjusted. By individually adjusting the tension of each belt 62 in this manner, a rotational moment opposite to the rotational moment generated by the movement of the X stage 30 is generated, and the load on the Y guide 11 is reduced.

Since the load applied to the Y guide 11 is greatly reduced by performing the above-described moment correction, the dynamic characteristics of the stage can be greatly improved without increasing the size and weight of the Y guide 11, and the step movement can be achieved. And high-speed and high-precision positioning.

In this manner, Y
Even if the rotational moment of the stage 20 is corrected and the vibration propagating to the Y stage 20 via the belt 62 is reduced, it is still difficult to completely eliminate the vibration propagating from the counter mass 61 to the Y stage 20. Such vibrations are as low as several Hz, but cannot be neglected in order to further improve the positioning accuracy and promote the speeding up.

Therefore, in the present embodiment, as shown in FIG.
c and a position sensor 61d for receiving the reflected light are arranged.
A pair of linear motors 80 as a counter mass driving mechanism for accelerating in the opposite direction to the stage 20 and suppressing the natural vibration of the counter mass 61 is provided. Double linear motor 80
Are disposed at both ends of the counter mass 61, respectively.
Y linear motor 40 for driving stage 20 in the Y-axis direction
Located on the back side of.

Each linear motor 80 has a counter mass 61
The linear motor mover 81 is integrated with the linear motor mover 81, and moves along a linear motor stator 82 provided on a side edge of the surface plate 10. That is, each linear motor 80 drives the counter mass 61 along the Y-axis direction. The linear motor 80 controls the current supplied to the linear motor stator 82 so that the acceleration of the counter mass 61 in the Y-axis direction
The value obtained by adjusting the absolute value in the opposite direction from 0 to the acceleration given to the Y stage 20 and further multiplying the value proportional to the inertia moment of the pulley 63 by the acceleration command value of the Y stage 20 is the counter mass. The control is performed by providing a feed-forward control system in the control system 61. The control system of the linear motor 80 that drives the counter mass 61 will be described later with reference to the block diagram shown in FIG.

The vibration transmitted from the counter mass mechanism 60 including the belt 62 to the Y stage 20
By reducing the natural vibration of the counter mass 61 by itself, the disturbance of the control system of the Y stage 20 can be removed very effectively, which contributes to further improvement of positioning accuracy and speeding up of positioning. .

The use of such a small, high-performance, high-speed stage apparatus can greatly contribute to miniaturization, high performance, and improvement in productivity of an exposure apparatus for manufacturing a semiconductor device or the like.

In the case where an air cylinder 72 shown in FIG. 5 is used as each actuator 70 instead of the bellofram 71, the operation is as follows. A cylinder 72b having an air supply port 72a is integral with the Y stage 20, and a rod projecting upward from a piston 72c is connected to a lower end of the belt 62. By changing the pressure of the air supplied to the air supply port 72a, the tension of the belt 62 is changed. The control system for controlling the air pressure of the cylinder 72b is the same as that shown in FIG.

The case where the linear motor 73 shown in FIG. 6 is used as each actuator 70 is as follows. The coil 73a of the linear motor 73 is the Y stage 20
A driving magnet 73b is connected to the lower end of the belt 62. The tension of the belt 62 is changed by changing the current supplied to the coil 73a.
The control system for controlling the current supplied to the coil 73a is shown in FIG.
Is the same as that shown in FIG.

The case where the piezoelectric element 74 shown in FIG. 7 is used as each actuator 70 is as follows. A housing 74 a supporting the upper end of the piezoelectric element 74 is integral with the Y stage 20, and a piezoelectric element 7
4 is connected to a housing 74b that supports the lower end. By changing the voltage of the piezoelectric element 74, its thickness is changed, and the effective length of the belt 62 is changed. The control system for controlling the voltage of the piezoelectric element 74 is the same as that shown in FIG.

FIG. 9 is a block diagram showing a control system of the counter mass 61 and the Y stage 20. In the following description, the work stage includes a Y stage 20, an X stage 30, mirrors 30a and 30b, and Y
The mover 41 of the linear motor 40, the X linear motor 50,
The actuator 70, the wafer as the work, and the whole thing that moves up and down integrally therewith are included. The counter stage has a counter mass 61 and a linear motor 80.
Mover 81 and the whole thing which moves up and down integrally therewith are included.

A servo system for controlling the Y linear motor 40 uses a position command value from the Y stage position command generating means 70b and position information in the Y axis direction of the Y stage 20 fed back from the position sensor 30c to a Y stage controller. , A D / A converter, and a current amplifier, and controls the driving amount of the Y linear motor 40 based on the signal. Similarly, the control system of the counter stage also uses the counter stage position command generating means 70c based on the information of the position sensor 61c.
From the counter stage controller, D /
The signal is sent through an A converter and a current amplifier, whereby the linear motor 80 is controlled. These position commands are calculated from target value settings, speed settings, and the like.

Counter stage position command generating means 70c
Then, the speed set value in the Y stage position command generation means 70b is multiplied by a synchronization error coefficient 70d by a multiplier 70e,
This is given as the speed setting of the counter stage position command generating means 70c. The synchronization error coefficient 70d shifts the synchronization between the work stage and the counter stage when the work stage is driven in the vertical direction, and can provide the pulley 63 with a drive amount (rotation angle) larger than the movement amount of the work stage. Is determined as follows.

By multiplying the synchronous error coefficient, each position command curve can control each drive time up to the target value Y0 as shown in the graph in the position command generating means block diagram in FIG. If the drive completion time t0 of the counter stage is set so as to be completed earlier than the drive completion time t1 of the Y stage (t0 <t1), the tension of the belt 62 connecting both the work stage and the counter stage is set in the vertical direction. Can be loosened during operation. As a result, slippage occurs between the pulley 63 and the belt 62, and the positional relationship between the work stage and the pulley 63 can be shifted little by little, so that the pulley 63 can be rotated and the same portion of the bearing can be used repeatedly. And the durability of the bearing can be improved.

FIG. 10 is a perspective view showing a stage device according to the second embodiment of the present invention. In this stage device, an actuator 90 is provided on a bearing portion (support portion) of a pulley 63 disposed on the upper end of the surface plate 10 instead of providing an actuator 70 on a connecting portion between the belt 62 and the Y stage 20. . As shown in FIG. 11, the actuator 90 includes a rolling bearing 63a for rotatably supporting the pulley 63.
Is a belofram 91 disposed between the bearing base 63b on which the is mounted and the surface plate 10. The bellofram 91 drives the bearing base 63b relative to the surface plate 10 in the Y direction. The internal configuration of the bellofram 91 is the same as that of the bellofram 71 shown in FIG.
And is controlled by a control system similar to that shown in FIG. Instead of the bellofram 91, an air cylinder, linear motor, and the like similar to those shown in FIGS.
Alternatively, a piezoelectric element or the like may be used.

Surface plate 10, Y guide 11, Y stage 2
Since 0, X stage 30, Y linear motor 40, X linear motor 50, counter mass mechanism 60, and the like are the same as in the first embodiment, they are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, when both the work stage and the counter stage are being driven in the vertical direction, the actuator 90 is controlled so as to loosen the tension of the belt 62 connecting the work stage and the counter stage. As a result, slippage occurs between the pulley 63 and the belt 62, and the positional relationship between the work stage and the pulley 63 can be shifted little by little.
3 can be rotated, and the same portion of the bearing is not used repeatedly, so that the durability of the bearing can be improved.

As described above, the actuator for adjusting the tension and the effective length of the belt may be used for the support of the pulley.
It is needless to say that the same torque compensation as described above can be effectively performed even if a similar actuator is provided at the connection between the belt and the counter mass on the back side of the surface plate.

Next, an exposure optical system of an X-ray exposure apparatus using the stage device according to the present invention will be described. As shown in FIG. 12, the SR light (charged particle storage ring radiation) as the X-rays emitted from the SR generator (charged particle storage ring) 1 as the X-ray source is in the form of a sheet beam. Is scanned in the Y-axis direction by a mirror 2 installed at a predetermined distance from the camera. The number of mirrors 2 is not limited to one, and a plurality of mirrors may be used.

Next, the SR light reflected by the mirror 2 passes through an original M such as a mask in which a pattern made of an X-ray absorber is formed on an X-ray transmitting film, and a resist as a photosensitive material is applied. The wafer W is irradiated. The wafer W is held on the wafer chuck (work stage) on the stage device described above, and the stage device performs step movement and positioning.

A shutter 4 for controlling the exposure time is provided upstream of the original M, and a driving device 4a for the shutter 4 is provided.
Is controlled by the shutter controller 4b. Next, a beryllium film (not shown) is provided between the mirror 2 and the shutter 4. The mirror 2 is controlled to an ultra-high vacuum, and the shutter 4 is controlled to a reduced pressure atmosphere of helium gas.

(Embodiment of Semiconductor Production System) Next, a semiconductor device (semiconductor chip such as IC or LSI, liquid crystal panel, C
An example of a production system for a CD, a thin-film magnetic head, a micromachine, and the like will be described. This is for troubleshooting and periodic maintenance of manufacturing equipment installed in semiconductor manufacturing plants,
Alternatively, maintenance services such as software provision are performed using a computer network outside the manufacturing factory.

FIG. 13 shows the whole system cut out from a certain angle. In the figure, reference numeral 101 denotes a business establishment of a vendor (apparatus supply maker) that provides a semiconductor device manufacturing apparatus. Examples of manufacturing equipment include semiconductor manufacturing equipment for various processes used in a semiconductor manufacturing plant, such as pre-processing equipment (lithography equipment such as exposure equipment, resist processing equipment, etching equipment, heat treatment equipment, film formation equipment, flattening equipment, etc.). Equipment and post-process equipment (assembly equipment, inspection equipment, etc.). A host management system 1 that provides a maintenance database for manufacturing equipment in the business office 101
08, a plurality of operation terminal computers 110, and a local area network (LAN) 109 connecting these to construct an intranet or the like. The host management system 108 has a gateway for connecting the LAN 109 to the Internet 105, which is an external network of the office, and a security function for restricting external access.

On the other hand, reference numerals 102 to 104 denote manufacturing factories of semiconductor manufacturers as users of the manufacturing apparatus. The manufacturing factories 102 to 104 may be factories belonging to different manufacturers or factories belonging to the same manufacturer (for example, a factory for a pre-process, a factory for a post-process, etc.). In each of the factories 102 to 104, a plurality of manufacturing apparatuses 106, a local area network (LAN) 111 connecting them to construct an intranet or the like, and a host as a monitoring apparatus for monitoring the operation status of each manufacturing apparatus 106 are provided. A management system 107 is provided. Each factory 1
Host management system 107 provided in the storage system 02 to 104
Has a gateway for connecting the LAN 111 in each factory to the Internet 105 which is an external network of the factory. As a result, access to the host management system 108 on the vendor 101 side from the LAN 111 of each factory via the Internet 105 is possible, and access is allowed only to limited users by the security function of the host management system 108. In particular,
Via the Internet 105, status information indicating the operation status of each manufacturing apparatus 106 (for example, the symptom of the manufacturing apparatus in which a trouble has occurred) is notified from the factory side to the vendor side, and response information corresponding to the notification (for example, (Information indicating how to cope with a trouble, software and data for coping), and maintenance information such as the latest software and help information can be received from the vendor. For data communication between each of the factories 102 to 104 and the vendor 101 and data communication with the LAN 111 in each of the factories, a communication protocol (T
CP / IP) is used. Instead of using the Internet as an external network outside the factory, it is also possible to use a dedicated line network (such as ISDN) that cannot be accessed by a third party and has high security. Further, the host management system is not limited to the one provided by the vendor, and a user may construct a database and place it on an external network, and permit access from a plurality of factories of the user to the database.

FIG. 14 is a conceptual diagram showing the whole system of the present embodiment cut out from another angle than that of FIG. In the above example, a plurality of user factories each having a manufacturing device and a management system of a vendor of the manufacturing device are connected via an external network, and the production management of each factory and at least one device are connected via the external network. The data of the manufacturing apparatus was communicated. On the other hand, in this example, a factory equipped with manufacturing equipment of a plurality of vendors is connected to a management system of each of the plurality of manufacturing equipments via an external network outside the factory, and maintenance information of each manufacturing equipment is stored. It is for data communication. In the figure, reference numeral 201 denotes a manufacturing plant of a manufacturing apparatus user (semiconductor device manufacturer), and a manufacturing line for performing various processes, for example, an exposure apparatus 202, a resist processing apparatus 203;
A film forming apparatus 204 is introduced. Although only one manufacturing factory 201 is illustrated in FIG. 14, a plurality of factories are actually networked similarly. Each device in the factory is connected by a LAN 206 to form an intranet or the like, and a host management system 205 manages the operation of the production line.

On the other hand, each business establishment of a vendor (apparatus maker) such as an exposure apparatus maker 210, a resist processing apparatus maker 220, and a film forming apparatus maker 230 has a host management system 21 for remote maintenance of the supplied equipment.
1, 211, and 231 which include a maintenance database and an external network gateway as described above. A host management system 205 for managing each device in the user's manufacturing plant, and a vendor management system 2 for each device
11, 221, and 231 are connected by the Internet or a dedicated line network which is the external network 200. In this system, if a trouble occurs in any of a series of manufacturing equipment on the manufacturing line,
Although the operation of the production line is suspended, quick response is possible by receiving remote maintenance via the Internet 200 from the vendor of the troubled device, and the suspension of the production line can be minimized.

Each of the manufacturing apparatuses installed in the semiconductor manufacturing factory has a display, a network interface, and a computer that executes network access software and apparatus operation software stored in a storage device. The storage device is a built-in memory, a hard disk, a network file server, or the like. The network access software includes a dedicated or general-purpose web browser, and provides, for example, a user interface having a screen as shown in FIG. 15 on a display. The operator who manages the manufacturing equipment at each factory refers to the screen and refers to the manufacturing equipment model 401, the serial number 402, the trouble subject 4
03, date of occurrence 404, degree of urgency 405, symptom 406, coping method 407, progress 408, and other information are input to input items on the screen. The input information is transmitted to the maintenance database via the Internet, and the resulting appropriate maintenance information is returned from the maintenance database and presented on the display. Further, the user interface provided by the web browser further includes a hyperlink function 410 as shown in the figure.
412, the operator can access more detailed information of each item, extract the latest version of software used for manufacturing equipment from the software library provided by the vendor, and operate the operation guide (help Information). Here, the maintenance information provided by the maintenance database includes the information on the present invention described above, and the software library also provides the latest software for realizing the present invention.

Next, a manufacturing process of a semiconductor device using the above-described production system will be described. FIG. 16 shows a flow of the entire semiconductor device manufacturing process.
In step 1 (circuit design), the circuit of the semiconductor device is designed. Step 2 is a process for making a mask on the basis of the circuit pattern design. Step 3
In (wafer manufacture), a wafer is manufactured using a material such as silicon. Step 4 (wafer process) is called a pre-process, and an actual circuit is formed on the wafer by lithography using the prepared mask and wafer. The next step 5 (assembly) is called a post-process, and is a process of forming a semiconductor chip using the wafer produced in step 4, and assembly such as an assembly process (dicing and bonding) and a packaging process (chip encapsulation). Process. In step 6 (inspection), inspections such as an operation confirmation test and a durability test of the semiconductor device manufactured in step 5 are performed. Through these steps, a semiconductor device is completed and shipped (step 7). The pre-process and the post-process are performed in separate dedicated factories, and maintenance is performed for each of these factories by the above-described remote maintenance system. Further, information for production management and apparatus maintenance is also communicated between the pre-process factory and the post-process factory via the Internet or a dedicated line network.

FIG. 17 shows a detailed flow of the wafer process. Step 11 (oxidation) oxidizes the wafer's surface. Step 12 (CVD) forms an insulating film on the wafer surface. Step 13 (electrode formation) forms electrodes on the wafer by vapor deposition. In step 14 (ion implantation), ions are implanted into the wafer. Step 1
In 5 (resist processing), a photosensitive agent is applied to the wafer. Step 16 (exposure) uses the above-described exposure apparatus to print and expose the circuit pattern of the mask onto the wafer. Step 17 (development) develops the exposed wafer. In step 18 (etching), portions other than the developed resist image are removed. In step 19 (resist stripping), unnecessary resist after etching is removed. By repeating these steps, multiple circuit patterns are formed on the wafer. Since the manufacturing equipment used in each process is maintained by the remote maintenance system described above, troubles can be prevented beforehand, and if troubles occur, quick recovery is possible. Can be improved in productivity.

[0063]

Since the present invention is configured as described above, it has the following effects. When the work stage is driven in the vertical direction, the tension of a connecting member such as a belt connecting the work stage and the counter mass can be reduced. As a result, the positional relationship between the work stage and the pulley can be shifted slightly, and the pulley can be rotated, so that the same part of the bearing is not used repeatedly, so that the durability of the bearing can be improved and the positioning accuracy can be improved. This has a great effect on improvement of the maintenance and maintainability.

By using this stage apparatus for an exposure apparatus, it is possible to greatly promote higher definition and lower cost of semiconductor devices and the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a stage device according to a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams for explaining a Y guide and the like of the stage device of FIG. 1, wherein FIG. 2A is a diagram illustrating the bearing rigidity of the Y guide, and FIG. 2B is a diagram illustrating a cross section of the Y guide; .

FIG. 3 is a perspective view of the apparatus of FIG. 1 as viewed from the back side.

FIG. 4 is a cross-sectional view illustrating a bellofram used as an actuator according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating an air cylinder used as an actuator according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a linear motor used as an actuator according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a piezoelectric element used as an actuator according to an embodiment of the present invention.

FIG. 8 is a block diagram showing a control system of the actuator according to the embodiment of the present invention.

FIG. 9 is a block diagram showing a control system for driving a counter mass and a work stage according to the embodiment of the present invention.

FIG. 10 is a perspective view showing a stage device according to a second embodiment of the present invention.

11 is a cross-sectional view for explaining the actuator in FIG.

FIG. 12 is a main part configuration diagram for explaining an example of an X-ray exposure apparatus using a stage device according to the present invention.

FIG. 13 is a conceptual view of a semiconductor device production system using an exposure apparatus according to the present invention, as viewed from a certain angle.

FIG. 14 is a conceptual diagram of a semiconductor device production system using the exposure apparatus according to the present invention, as viewed from another angle.

FIG. 15 is a specific example of a user interface.

FIG. 16 is a diagram illustrating a flow of a device manufacturing process.

FIG. 17 is a diagram illustrating a wafer process.

FIG. 18 is a side view showing a vertical stage device according to one conventional example.

19 is an elevational view showing the device of FIG.

[Explanation of symbols]

10: Surface plate, 10a: Y guide surface (reference surface), 1l: Y
Guide, 20: Y stage, 23: Connecting plate, 30: X stage, 40: Y linear motor (stage driving mechanism),
50: X linear motor, 60: counter mass mechanism, 6
1: counter mass, 62: belt (connecting member), 63:
Pulley, 70, 90: actuator, 70a: controller, 70b: Y stage position command generating means, 70c:
Counter stage position command generating means, 70d: synchronization error coefficient, 70e: multiplier, 71, 91: bellofram, 7
2: air cylinder, 73, 80: linear motor (counter mass drive mechanism), 74: piezoelectric element, 81: linear motor movable element, 82: linear motor stator.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) H01L 21/68 H01L 21/30 531J 503A F term (Reference) 2F078 CA02 CA10 CB05 CB10 CB12 CB14 CB16 CC07 CC11 2H097 AB05 BA10 CA15 GA45 LA10 5F031 CA02 CA05 HA13 HA45 HA53 HA55 JA06 JA17 JA27 JA32 JA51 KA06 LA03 LA04 LA08 LA10 LA13 LA15 MA27 PA01 5F046 CC01 CC13 CC18 GA11 GA14

Claims (27)

[Claims] 1. A work stage movable along a reference plane, a stage drive mechanism for moving the work stage along a vertical direction, and a counter stage including a counter mass balanced with the weight of the work stage. A connecting member that connects the work stage and the counter mass; a pulley that supports the connecting member; a counter mass driving mechanism that moves the counter mass along the vertical direction; and a command value to the stage driving mechanism. First command generating means for giving; a second command generating means for giving a command value to the counter mass drive mechanism independently of the first command generating means; and the work stage is driven along the vertical direction. Means for multiplying the speed command value of the counter mass by a synchronization error coefficient. 2. The apparatus according to claim 1, wherein the work stage includes a first stage that moves along the vertical direction, and a second stage that moves along the reference plane.
The stage apparatus according to claim 1, further comprising a second stage that is dimensionally movable. 3. The synchronous error coefficient is such that, when the work stage is driven in the vertical direction, the work stage and the counter stage are desynchronized, and the pulley is driven to rotate more than the amount of movement of the work stage. 3. The stage device according to claim 1, wherein the stage device is provided with an amount. 4. The stage apparatus according to claim 1, wherein the stage driving mechanism and the counter mass driving mechanism are linear motors. 5. The stage device according to claim 1, further comprising a hydrostatic bearing device for keeping the work stage out of contact with a reference surface. 6. A yaw guide for vertically guiding the work stage, and a yaw guide hydrostatic bearing device for keeping the work stage out of contact with the yaw guide. The stage device according to any one of the above. 7. A counter mass yaw guide for guiding the counter mass in the vertical direction, and a counter mass yaw guide hydrostatic bearing device for keeping the counter mass in non-contact with the counter mass yaw guide. The stage device according to claim 1, wherein: 8. An actuator for adjusting at least one of the tension and the effective length of the connecting member according to the displacement of the work stage, wherein the actuator includes an air spring, an air cylinder, a linear motor, The stage device according to claim 1, wherein one of the piezoelectric elements is used. 9. A work stage movable along a reference plane, a stage drive mechanism for moving the work stage along a vertical direction, and a counter stage including a counter mass balanced with the weight of the work stage. A connecting member for connecting the work stage and the counter mass; a pulley for supporting the connecting member; a counter mass driving mechanism for moving the counter mass along the vertical direction; When moves
Means for reducing the tension of the connecting member. 10. The means for relaxing the tension of the connecting member,
10. The stage device according to claim 9, wherein the stage device is control means for controlling the stage driving mechanism and the counter mass driving mechanism by shifting the synchronization of the movement of the work stage and the counter mass. 11. The stage apparatus according to claim 9, wherein a rotation drive amount different from a rotation drive amount corresponding to the movement amount of the work stage is applied to the pulley. 12. The means for relaxing the tension of the connecting member,
The stage device according to claim 9, wherein the stage device is an actuator that drives the pulley in the vertical direction. 13. The stage device according to claim 9, wherein said stage driving mechanism and said counter mass driving mechanism are linear motors. 14. The stage device according to claim 9, further comprising a hydrostatic bearing device for keeping the work stage out of contact with a reference plane. 15. A yaw guide for vertically guiding the work stage and a yaw guide hydrostatic bearing device for keeping the work stage out of contact with the yaw guide. The stage device according to any one of the above. 16. A counter mass yaw guide for vertically guiding the counter mass and a counter mass yaw guide hydrostatic bearing device for keeping the counter mass out of contact with the counter mass yaw guide. The stage device according to claim 9, wherein: 17. An actuator for adjusting at least one of a tension and an effective length of the connecting member according to a displacement of the work stage, wherein the actuator includes an air spring, an air cylinder, a linear motor, 17. The stage device according to claim 9, wherein any one of the piezoelectric elements is used. 18. An exposure apparatus comprising: the stage device according to claim 1; and an exposure optical system for exposing a work held by the stage device. 19. The exposure apparatus according to claim 18, wherein the exposure light is an X-ray. 20. A device manufacturing method comprising a step of exposing a wafer by the exposure apparatus according to claim 18. 21. A step of installing a manufacturing apparatus group for various processes including the exposure apparatus according to claim 18 or 19 in a semiconductor manufacturing plant, and manufacturing a semiconductor device by a plurality of processes using the manufacturing apparatus group. And a method for manufacturing a semiconductor device. 22. A step of connecting the manufacturing equipment group via a local area network, and data communication between at least one of the manufacturing equipment group between the local area network and an external network outside the semiconductor manufacturing factory. 22. The method according to claim 21, further comprising the step of: 23. Access to a database provided by a vendor or a user of the exposure apparatus via the external network to obtain maintenance information of the manufacturing apparatus by data communication, or a semiconductor manufacturing factory different from the semiconductor manufacturing factory 23. The production control is performed by performing data communication between the control unit and the external network.
3. The method for manufacturing a semiconductor device according to item 1. 24. A manufacturing apparatus group for various processes including the exposure apparatus according to claim 18 or 19, a local area network connecting the manufacturing apparatus group, and an external network outside the factory from the local area network. A semiconductor manufacturing plant having a gateway for enabling the data communication of information on at least one of the manufacturing apparatus groups. 25. The semiconductor device according to claim 1, which is installed in a semiconductor manufacturing plant.
20. The maintenance method of an exposure apparatus according to 8 or 19, wherein a vendor or a user of the exposure apparatus provides a maintenance database connected to an external network of a semiconductor manufacturing plant; An exposure apparatus, comprising: a step of permitting access to the maintenance database via a network; and a step of transmitting maintenance information stored in the maintenance database to a semiconductor manufacturing factory via the external network. Maintenance method. 26. The exposure apparatus according to claim 18, further comprising a display, a network interface, and a computer executing network software, and performing maintenance communication of the exposure apparatus by data communication via a computer network. An exposure apparatus characterized in that it is possible to perform 27. The network software,
Provided on the display is a user interface for accessing a maintenance database provided by a vendor or a user of the exposure apparatus connected to an external network of a factory where the exposure apparatus is installed, and from the database via the external network. The exposure apparatus according to claim 26, wherein information can be obtained.