US20010019250A1 - Exposure apparatus and method utilizing isolated reaction frame - Google Patents
Exposure apparatus and method utilizing isolated reaction frame Download PDFInfo
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- US20010019250A1 US20010019250A1 US09/836,273 US83627301A US2001019250A1 US 20010019250 A1 US20010019250 A1 US 20010019250A1 US 83627301 A US83627301 A US 83627301A US 2001019250 A1 US2001019250 A1 US 2001019250A1
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- stage
- members
- window frame
- frame
- base
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70358—Scanning exposure, i.e. relative movement of patterned beam and workpiece during imaging
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70691—Handling of masks or workpieces
- G03F7/70716—Stages
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70808—Construction details, e.g. housing, load-lock, seals or windows for passing light in or out of apparatus
- G03F7/70825—Mounting of individual elements, e.g. mounts, holders or supports
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70808—Construction details, e.g. housing, load-lock, seals or windows for passing light in or out of apparatus
- G03F7/70833—Mounting of optical systems, e.g. mounting of illumination system, projection system or stage systems on base-plate or ground
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70858—Environment aspects, e.g. pressure of beam-path gas, temperature
- G03F7/709—Vibration, e.g. vibration detection, compensation, suppression or isolation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20012—Multiple controlled elements
- Y10T74/20201—Control moves in two planes
Definitions
- This invention relates to precision motion stages and more specifically to a stage suitable for use in a photolithography machine and especially adapted for supporting a reticle.
- Photolithography is a well known field especially as applied to semiconductor fabrication.
- a stage an X-Y motion device
- the reticle i.e., mask
- a second stage supports the semiconductor wafer, i.e. the work piece being processed.
- Sometimes only a single stage is provided, for the wafer or the mask.
- Such stages are essential for precision motion in the X-axis and Y-axis directions and often some slight motion is provided for adjustments in the vertical (Z-axis) direction.
- a reticle stage is typically used where the reticle is being scanned in a scanning exposure system, to provide smooth and precise scanning motion in one linear direction and insuring accurate, reticle to wafer alignment by controlling small displacement motion perpendicular to the scanning direction and a small amount of “yaw” (rotation) in the X-Y plane. It is desirable that such an X-Y stage be relatively simple and be fabricated from commercially available components in order to reduce cost, while maintaining the desired amount of accuracy. Additionally, many prior art stages include a guide structure located directly under the stage itself.
- a precision motion stage mechanism includes the stage itself which moves in the X-Y plane on a flat base.
- the stage is laterally surrounded by a “window frame” guide structure which includes four members attached at or near their corners to form a rectangular structure.
- the attachments are flexures which are a special type of hinge allowing movement to permit slight distortion of the rectangle.
- these flexures are thin stainless steel strips attached in an “X” configuration, allowing the desired degree of hinge movement between any two adjacent connected window frame members.
- the window frame guide structure moves on a base against two spaced-apart and parallel fixed guides in e.g. the X axis direction, being driven by motor coils mounted on two opposing members of the window frame cooperating with magnetic tracks fixed on the base.
- the window frame in effect “follows” the movement of the stage and carries the magnetic tracks needed for movement of the stage in the Y axis direction.
- references herein to the X and Y axes directions are merely illustrative and for purposes of orientation relative to the present drawings and are not to be construed as limiting.
- stage movement in the direction perpendicular (the Y axis direction) to the direction of movement of the window frame is accomplished by the stage moving along the other two members of the window frame.
- the stage is driven relative to the window frame by motor coils mounted on the stage and cooperating with magnetic tracks mounted in the two associated members of the window frame.
- the stage is supported on the base by air bearings or other fluid bearings mounted on the underside of the stage.
- fluid bearings support the window frame members on their fixed guides.
- fluid bearings load the window frame members against the fixed guides and load the stage against the window frame. So as to allow slight yaw movement, these loading bearings are spring mounted.
- the stage itself defines a central passage.
- the reticle rests on a chuck mounted on the stage. Light from an illuminating source typically located typically above the reticle passes to the central passage through the reticle and chuck to the underlying projection lens.
- the present stage is not restricted to supporting a reticle but also may be used as a wafer stage and is indeed not limited to photolithography applications but is generally suited to precision stages.
- reaction force of the stage and window frame drive motors is not transmitted to the support frame of the photolithography apparatus projection lens but is transmitted independently directly to the earth's surface by an independent supporting structure.
- reaction forces caused by movement of the stage do not induce undesirable movement in the projection lens or other elements of the photolithography machine.
- stage reaction forces from the projection lens and associated structures prevents these reaction forces from vibrating the projection lens and associated structures.
- These structures include the interferometer system used to determine the exact location of the stage in the X-Y plane and the wafer stage.
- the reticle stage mechanism support is spaced apart from and independently supported from the other elements of the photolithography machine and extends to the surface of the earth.
- the reaction forces from operation of the four motor coils for moving both the stage and its window frame are transmitted through the center of gravity of the stage, thereby desirably reducing unwanted moments of force (i.e., torque).
- the controller controlling the power to the four drive motor coils takes into consideration the relative position of the stage and the frame and proportions the driving force accordingly by a differential drive technique.
- FIG. 1 shows a top view of the present window frame guided stage.
- FIG. 2 shows a side view of the window frame guided stage and associated structures.
- FIGS. 3A and 3B show enlarged views of portions of the structure of FIG. 2.
- FIG. 4 shows a top view of a photolithography apparatus including the present window frame guided stage.
- FIG. 5 shows a side view of the photolithography apparatus of FIG. 4.
- FIGS. 6A and 6B show a flexure hinge structure as used e.g. in the present window frame guided stage.
- FIG. 1 shows a top view of a stage mechanism in accordance with the present invention. See also copending commonly owned and invented U.S. patent application, Ser. No. 08/221,375 entitled “Guideless Stage with Isolated Reaction Stage” filed Apr. 1, 1994, original docket no. NPI0500 which is incorporated herein by reference and shows a related method of supporting elements of a stage mechanism so as to isolate reaction forces from the projection lens and other parts of a photolithography apparatus.
- the stage 10 is (in plan view) a rectangular structure of a rigid material (e.g., steel, aluminum, or ceramic).
- Two interferometry mirrors 14 A and 14 B located on stage 10 interact conventionally with respectively laser beams 16 A and 16 B.
- laser beams 16 A are two pairs of laser beams and laser beams 16 B are one pair of laser beam, for three independent distance measurements.
- the underside of stage 10 defines a relieved portion 22 (indicated by a dotted line, not being visible in the plane of the drawing).
- a reticle 24 is located on stage 10 and held by conventional reticle vacuum groove 26 formed in the upper surface of chuck plate 28 .
- Stage 10 also defines a central aperture 30 (passage) below the location of reticle 24 .
- Central aperture 30 allows the light (or other) beam which penetrates through reticle 24 to enter the underlying projection lens, as described further below. (It is to be understood that the reticle 24 itself is not a part of the stage mechanism.) Moreover if the present stage mechanism is to be used for other than a reticle stage, i.e. for supporting a wafer, aperture 30 is not needed.
- Stage 10 is supported on a conventional rectangular base structure 32 of e.g. granite, steel, or aluminum, and having a smooth planar upper surface.
- the left and right edges (in FIG. 1) of base structure 32 are shown as dotted lines, being overlain by other structures (as described below) in this view.
- stage 10 is not in direct physical contact with its base structure 32 ; instead, stage 10 is vertically supported by, in this example, conventional bearings such as gas bearings.
- three air bearings 36 A, 36 B and 36 C are used which may be of a type commercially available.
- the vacuum portion is physically separated from and adjacent to the air bearing portion. It is to be understood that the vacuum and compressed air are provided externally via tubing in a conventional cable bundle and internal tubing distribution system (not shown in the drawings for simplicity). In operation stage 10 thereby floats on the air bearings 36 A, 36 B, 36 C approximately 1 to 3 micrometers above the flat top surface of base structure 32 . It is to be understood that other types of bearings (e.g. air bearing/magnetic combination type) may be used alternatively.
- Stage 10 is laterally surrounded by the “window frame guide” which is a four member rectangular structure.
- the four members as shown in FIG. 1 are (in the drawing) the top member 40 A, the bottom member 40 B, the lefthand member 40 C, and the righthand member 40 D.
- the four members 40 A- 40 D are of any material having high specific stiffness (stiffness to density ratio) such as aluminum or a composite material.
- These tour members 40 A- 40 D are attached together by hinge structures which allow non-rigid movement of the four members relative to one another in the X-Y plane and about the Z-axis as shown in the drawing, this movement also referred to as a “yaw” movement.
- the hinge is described in detail below, each hinge 44 A, 44 B, 44 C and 44 D being e.g. one or more metal flexures allowing a slight flexing of the window frame guide structure.
- the window frame guide structure moves in the X axis (to the left and right in FIG. 1) supported on horizontal surfaces of fixed guides 46 A and 46 B, and supported on vertical surfaces of fixed guides 64 A, 64 B.
- each pair of fixed guides 46 A, 64 A and 46 B, 64 B could be e.g. a single L-shaped fixed guide, or other configurations of fixed guides may be used.
- Mounted on window frame guide member 40 A are two air bearings 50 A and 50 B that cause the member 40 A to ride on its supporting fixed guide member 46 A.
- air bearings 52 A and 52 B are mounted on the member 40 B, allowing member 40 B to ride on its supporting fixed guide member 46 B.
- Air bearings 50 A, 50 B, 52 A, 52 B are similar to air bearings 36 A, etc.
- the window frame guide is driven along the X axis on fixed guides 46 A and 46 B, 64 A and 64 B by a conventional linear motor, which includes a coil 60 A which is mounted on window frame guide member 40 A.
- Motor coil 60 A moves in a magnetic track 62 A which is located in (or along) fixed guide 64 A.
- motor coil 60 B which is mounted on window frame guide member 40 B moves in magnetic track 62 B which is located in fixed guide 64 B.
- the motor coil and track combinations are part no. LM-310 from Trilogy Company of Webster Tex. These motors are also called “linear commutator motors”.
- the tracks 62 A, 62 B are each a number of permanent magnets fastened together.
- the electric wires which connect to the motor coils are not shown but are conventional. Other types of linear motors may be substituted. It is to be understood that the locations of the motor coils and magnetic tracks for each motor could be reversed, so that for instance the magnetic tracks are located on stage 10 and the corresponding motor coils on the window frame guide members, at a penalty of reduced performance.
- stage 10 moves along the Y axis in FIG. 1 by means of motor coils 68 A and 68 B mounted respectively on the left and right edges of stage 10 .
- Motor coil 68 A moves in magnetic track 70 A mounted in window frame guide member 40 C.
- Motor coil 68 B moves in magnetic track 70 B mounted in window frame guide member 40 D.
- Air bearing 72 A is located on window frame guide member 40 A and minimizes friction between window frame guide member 40 A and its fixed guide 64 A.
- two air bearings 72 B and 72 C on window frame guide member 40 B minimize its friction with the fixed guide 64 B.
- the use of a single air bearing 72 A at one end and two opposing air bearings 72 B and 72 C at the other end allows a certain amount of yaw (rotation in the X-Y plane about the Z-axis) as well as limited motion along the Z-axis.
- typically air bearing 72 A is gimbal mounted, or gimbal mounted with the gimbal located on a flexure so as to allow a limited amount of misalignment between the member 40 A and fixed guide 64 A.
- air bearing 72 A opposing bearings 72 B and 72 C provides a loading effect to keep the window frame guide in its proper relationship to fixed guides 64 A, 64 B.
- an air bearing 76 A loads opposing air bearings 76 B and 76 C, all mounted on side surfaces of the stage 10 , in maintaining the proper location of stage 10 relative to the opposing window frame guide members 40 B and 40 D.
- one air bearing such as 76 A is gimbal mounted to provide a limited amount of misalignment, or gimbal mounted with the gimbal on a flexure (spring).
- Air bearings 72 A, 72 B, 72 C and 76 A, 76 B, and 76 C are conventional air bearings.
- the outer structure 80 in FIG. 1 is the base support structure for the fixed guides 46 A, 46 B, 64 A, 64 B and the window frame guide members 40 A, . . . , 40 D of the stage mechanism, but does not support stage base structure 32 .
- Base support structure 80 is supported by its own support pillars or other conventional support elements (not shown in this drawing) to the ground, i.e. the surface of the earth or the floor of a building.
- An example of a suitable support structure is disclosed in above-referenced U.S. patent application Ser. No. 08/221,375 at FIGS. 1, 1B, 1 C.
- This independent support structure for this portion of stage mechanism provides the above-described advantage of transmitting the reaction forces of the reticle stage mechanism drive motors away from the frame supporting the other elements of the photolithography apparatus, especially away from the optical elements including the projection lens and from the wafer stage, thereby minimizing vibration forces on the projection lens due to reticle stage movement. This is further described below.
- the drive forces for the stage mechanism are provided as close as possible through the stage mechanism center of gravity.
- the center of gravity of the stage mechanism moves with the stage 10 .
- the stage 10 and the window frame guide combine to define a joint center of gravity.
- a first differential drive control (not shown) for motor coils 60 A, 60 B takes into account the location of the window frame guide to control the force exerted by each motor coil 60 A, 60 B to keep the effective force applied at the center of gravity.
- a second conventional differential drive control (not shown) for motor coils 68 A, 68 B takes into account the location of stage 10 to control the force exerted by each motor coil 68 A, 68 B to keep the effective force applied at the center of gravity.
- stage 10 since stage 10 has a substantial range of movement, that the differential drive for the motor coils 60 A, 60 B has a wide differential swing.
- the window frame guide has a more limited range of movement, hence the differential drive for the motor coils 68 A, 68 B has a much lesser differential swing, providing a trim effect.
- use of the window frame guide maintains the reaction forces generated by movement of the reticle stage mechanism in a single plane, thus making easier to isolate these forces from other parts of the photolithography apparatus.
- FIG. 2 shows a cross-sectional view through line 2 - 2 of FIG. 1.
- the structures shown in FIG. 2 which are also in FIG. 1 have identical reference numbers and are not described herein.
- the illuminator 90 which is a conventional element shown here without detail, and omitted from FIG. 1 for clarity.
- the upper portion of the projection lens (barrel) 92 is also shown without detail in FIG. 2 . It is to be understood that the lower portion of the projection lens and other elements of the photolithography apparatus are not shown in FIG. 2, but are illustrated and described below.
- stage 10 is not in this embodiment a flat structure but defines the underside relieved portion 22 to accommodate the upper portion of lens 92 .
- Magnetic track 70 A is mounted on top of the window frame guide 40 B and similarly magnetic track 70 B is mounted on top of the opposite window frame guide member 40 D.
- FIGS. 3A and 3B are enlarged views of portions of FIG. 2, with identical reference numbers; FIG. 3A is the left side of FIG. 2 and FIG. 3B is the right side of FIG. 2. Shown in FIG. 3A is the spring mounting 78 for air bearing 76 A. Air bearing 78 A being spring mounted to a side surface of stage 10 , this allows a certain amount of yaw (rotation in the X-Y plane about the Z-axis) as well as limited motion along the Z-axis. A gimbal mounting may be used in place of or in addition to the spring 78 . The spring or gimbal mounting thereby allows for a limited amount of misalignment between stage 10 and members 40 C, 40 D (not shown in FIG. 3A).
- FIG. 4 is a top view of a photolithography apparatus including the stage mechanism of FIGS. 1 and 2 and further including, in addition to the elements shown in FIG. 1, the supporting base structure 100 which supports the photolithography apparatus including frame 94 except for the reticle stage mechanism.
- Base structure 100 supports four vertical support pillars 102 A, 102 B, 102 C and 102 D connected to structure 94 by respectively bracket structures 106 A, 106 B, 106 C and 106 D. It is to be appreciated that the size of the base structure 100 is fairly large, i.e. approximately 3 meters top to bottom in one embodiment.
- Each pillar 102 A, 102 B, 102 C, 102 D includes an internal conventional servo mechanism (not shown) for leveling purposes. Also shown in FIG. 4 are the supports 108 and 110 for respectively laser interferometer units (beam splitter etc.) 112 A, 112 B, 112 C. FIG. 4 will be further understood with reference to FIG. 5 which shows a view of FIG. 4 through cross-sectional line 5 - 5 of FIG. 4.
- FIGS. 4 and 5 the full extent of the supporting structure 94 can be seen along with its support pillars 102 A, 102 C which rest on the base structure 100 which is in contact with the ground via a conventional foundation (not shown).
- the independent support structure for the reticle stage base support structure 80 is shown, in FIG. 4 only (for clarity) and similarly includes a set of four pillars 114 A, 114 B, 114 C, 114 D with associated bracket structures 116 A, 116 B, 116 C, 116 D, with the pillars thereby extending from the level of base support structure 80 down to the base structure 100 .
- FIG. 5 shows the wafer stage 120 and associated support structures 122 , 124 .
- the elements of wafer stage 120 conventionally include (not labelled in the drawing) a base, the stage itself, fixed stage guides located on the base, magnetic tracks located on the fixed stage guides, and motor coils fitting in the magnetic tracks and connected to the stage itself.
- Laser beams from laser 124 mounted on support 126 locate lens 92 and the stage itself by interferometry.
- FIG. 6A shows detail of one of the window frame guide hinged flexure structures, e.g. 44 C, in a top view (corresponding to FIG. 1).
- hinges 44 A, 44 B, 44 C and 44 D is identical.
- These flexure hinges have the advantage over a mechanical-type hinge of not needing lubrication, not exhibiting histeresis (as long as the flexure is not bent beyond its mechanical tolerance) and not having any mechanical “slop”, as well as being inexpensive to fabricate.
- Each individual flexure is e.g. 1 ⁇ 4 hard 302 stainless steel approximately 20 mils (0.02 inch) thick and can sustain a maximum bend of 0.5 degree.
- the width of each flexure is not critical; a typical width is 0.5 inch.
- Two, three or four flexures are used at each hinge 44 A, 44 B, 44 C and 44 D in FIG. 1.
- the number of flexures used at each hinge is essentially determined by the amount of space available, i.e., the height of the window frame guide members.
- clamps 136 A, 136 B, 136 C, 136 D are each attached by clamps 136 A, 136 B, 136 C, 136 D to adjacent frame members (members 40 B and 40 D in FIGS. 6A and 6B) by conventional screws which pass through holes in the individual flexures 130 A, 130 B, 130 C, 130 D and through the clamps and are secured in corresponding threaded holes in frame members 40 B and 40 D.
- frame members 40 B, 40 D of FIGS. 6A and 6B differ somewhat from those of FIG. 1 in terms of the angular (triangular) structures at the ends of frame members 40 B, 40 D and to which the metal flexures 130 A, 130 B, 130 C, 130 D are mounted.
- these angular structures are dispensed with, although their presence makes screw mounting of the flexures easier.
- the window frame guide is not hinged but is a rigid structure. To accommodate this rigidity and prevent binding, one of bearings 72 C or 72 B is eliminated, and the remaining bearing moved to the center of member 40 B, mounted on a gimbal with no spring. The other bearings (except those mounted on stage 10 ) are also gimballed.
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Abstract
A guided stage mechanism suitable for supporting a reticle in a photolithography machine includes a stage movable in the X-Y directions on a base. Laterally surrounding the stage is a rectangular window frame guide which is driven in the X-axis direction on two fixed guides by means of motor coils on the window frame guide co-operating with magnetic tracks fixed on the base. The stage is driven inside the window frame guide in the Y-axis direction by motor coils located on the stage co-operating with magnetic tracks located on the window frame guide. Forces from the drive motors of both the window frame guide and the stage are transmitted through the center of gravity of the stage, thereby eliminating unwanted moments of inertia. Additionally, reaction forces caused by the drive motors are isolated from the projection lens and the alignment portions of the photolithography machine. This isolation is accomplished by providing a mechanical support for the stage independent of the support for its window frame guide. The window frame guide is a hinged structure capable of a slight yawing (rotational) motion due to hinged flexures which connect the window frame guide members.
Description
- 1. Field of the Invention
- This invention relates to precision motion stages and more specifically to a stage suitable for use in a photolithography machine and especially adapted for supporting a reticle.
- 2. Description of the Prior Art
- Photolithography is a well known field especially as applied to semiconductor fabrication. In photolithography equipment a stage (an X-Y motion device) supports the reticle (i.e., mask) and a second stage supports the semiconductor wafer, i.e. the work piece being processed. Sometimes only a single stage is provided, for the wafer or the mask.
- Such stages are essential for precision motion in the X-axis and Y-axis directions and often some slight motion is provided for adjustments in the vertical (Z-axis) direction. A reticle stage is typically used where the reticle is being scanned in a scanning exposure system, to provide smooth and precise scanning motion in one linear direction and insuring accurate, reticle to wafer alignment by controlling small displacement motion perpendicular to the scanning direction and a small amount of “yaw” (rotation) in the X-Y plane. It is desirable that such an X-Y stage be relatively simple and be fabricated from commercially available components in order to reduce cost, while maintaining the desired amount of accuracy. Additionally, many prior art stages include a guide structure located directly under the stage itself. This is not a desirable in a reticle stage since it is essential that a light beam be directed through the reticle and through the stage itself to the underlying projection lens. Thus a stage is needed which does not include any guides directly under the stage itself, since the stage itself must define a fairly large central passage for the light beam.
- Additionally, many prior art stages do not drive the stage through its center of gravity which undesirably induces a twisting motion in the stage, reducing the frequency response of the stage. Therefore there is a need for an improved stage and especially one suitable for a reticle stage.
- A precision motion stage mechanism includes the stage itself which moves in the X-Y plane on a flat base. The stage is laterally surrounded by a “window frame” guide structure which includes four members attached at or near their corners to form a rectangular structure. The attachments are flexures which are a special type of hinge allowing movement to permit slight distortion of the rectangle. In one version these flexures are thin stainless steel strips attached in an “X” configuration, allowing the desired degree of hinge movement between any two adjacent connected window frame members.
- The window frame guide structure moves on a base against two spaced-apart and parallel fixed guides in e.g. the X axis direction, being driven by motor coils mounted on two opposing members of the window frame cooperating with magnetic tracks fixed on the base.
- The window frame in effect “follows” the movement of the stage and carries the magnetic tracks needed for movement of the stage in the Y axis direction. (It is to be understood that references herein to the X and Y axes directions are merely illustrative and for purposes of orientation relative to the present drawings and are not to be construed as limiting.)
- The stage movement in the direction perpendicular (the Y axis direction) to the direction of movement of the window frame is accomplished by the stage moving along the other two members of the window frame. The stage is driven relative to the window frame by motor coils mounted on the stage and cooperating with magnetic tracks mounted in the two associated members of the window frame.
- To minimize friction, the stage is supported on the base by air bearings or other fluid bearings mounted on the underside of the stage. Similarly fluid bearings support the window frame members on their fixed guides. Additionally, fluid bearings load the window frame members against the fixed guides and load the stage against the window frame. So as to allow slight yaw movement, these loading bearings are spring mounted. The stage itself defines a central passage. The reticle rests on a chuck mounted on the stage. Light from an illuminating source typically located typically above the reticle passes to the central passage through the reticle and chuck to the underlying projection lens.
- It is to be understood that the present stage, with suitable modifications, is not restricted to supporting a reticle but also may be used as a wafer stage and is indeed not limited to photolithography applications but is generally suited to precision stages.
- An additional aspect in accordance with the present invention is that the reaction force of the stage and window frame drive motors is not transmitted to the support frame of the photolithography apparatus projection lens but is transmitted independently directly to the earth's surface by an independent supporting structure. Thus the reaction forces caused by movement of the stage do not induce undesirable movement in the projection lens or other elements of the photolithography machine.
- This physically isolating the stage reaction forces from the projection lens and associated structures prevents these reaction forces from vibrating the projection lens and associated structures. These structures include the interferometer system used to determine the exact location of the stage in the X-Y plane and the wafer stage. Thus the reticle stage mechanism support is spaced apart from and independently supported from the other elements of the photolithography machine and extends to the surface of the earth.
- Advantageously, the reaction forces from operation of the four motor coils for moving both the stage and its window frame are transmitted through the center of gravity of the stage, thereby desirably reducing unwanted moments of force (i.e., torque). The controller controlling the power to the four drive motor coils takes into consideration the relative position of the stage and the frame and proportions the driving force accordingly by a differential drive technique.
- FIG. 1 shows a top view of the present window frame guided stage.
- FIG. 2 shows a side view of the window frame guided stage and associated structures.
- FIGS. 3A and 3B show enlarged views of portions of the structure of FIG. 2.
- FIG. 4 shows a top view of a photolithography apparatus including the present window frame guided stage.
- FIG. 5 shows a side view of the photolithography apparatus of FIG. 4.
- FIGS. 6A and 6B show a flexure hinge structure as used e.g. in the present window frame guided stage.
- FIG. 1 shows a top view of a stage mechanism in accordance with the present invention. See also copending commonly owned and invented U.S. patent application, Ser. No. 08/221,375 entitled “Guideless Stage with Isolated Reaction Stage” filed Apr. 1, 1994, original docket no. NPI0500 which is incorporated herein by reference and shows a related method of supporting elements of a stage mechanism so as to isolate reaction forces from the projection lens and other parts of a photolithography apparatus.
- The
stage 10 is (in plan view) a rectangular structure of a rigid material (e.g., steel, aluminum, or ceramic). Twointerferometry mirrors stage 10 interact conventionally with respectivelylaser beams laser beams 16A are two pairs of laser beams andlaser beams 16B are one pair of laser beam, for three independent distance measurements. The underside ofstage 10 defines a relieved portion 22 (indicated by a dotted line, not being visible in the plane of the drawing). Areticle 24 is located onstage 10 and held by conventionalreticle vacuum groove 26 formed in the upper surface ofchuck plate 28.Stage 10 also defines a central aperture 30 (passage) below the location ofreticle 24.Central aperture 30 allows the light (or other) beam which penetrates throughreticle 24 to enter the underlying projection lens, as described further below. (It is to be understood that thereticle 24 itself is not a part of the stage mechanism.) Moreover if the present stage mechanism is to be used for other than a reticle stage, i.e. for supporting a wafer,aperture 30 is not needed. -
Stage 10 is supported on a conventionalrectangular base structure 32 of e.g. granite, steel, or aluminum, and having a smooth planar upper surface. The left and right edges (in FIG. 1) ofbase structure 32 are shown as dotted lines, being overlain by other structures (as described below) in this view. In operation,stage 10 is not in direct physical contact with itsbase structure 32; instead, stage 10 is vertically supported by, in this example, conventional bearings such as gas bearings. In one embodiment threeair bearings - In an alternative air bearing/vacuum structure, the vacuum portion is physically separated from and adjacent to the air bearing portion. It is to be understood that the vacuum and compressed air are provided externally via tubing in a conventional cable bundle and internal tubing distribution system (not shown in the drawings for simplicity). In
operation stage 10 thereby floats on theair bearings base structure 32. It is to be understood that other types of bearings (e.g. air bearing/magnetic combination type) may be used alternatively. -
Stage 10 is laterally surrounded by the “window frame guide” which is a four member rectangular structure. The four members as shown in FIG. 1 are (in the drawing) thetop member 40A, thebottom member 40B, thelefthand member 40C, and therighthand member 40D. The fourmembers 40A-40D are of any material having high specific stiffness (stiffness to density ratio) such as aluminum or a composite material. Thesetour members 40A-40D are attached together by hinge structures which allow non-rigid movement of the four members relative to one another in the X-Y plane and about the Z-axis as shown in the drawing, this movement also referred to as a “yaw” movement. The hinge is described in detail below, eachhinge - The window frame guide structure moves in the X axis (to the left and right in FIG. 1) supported on horizontal surfaces of fixed
guides guides guides frame guide member 40A are twoair bearings 50A and 50B that cause themember 40A to ride on its supporting fixedguide member 46A. Similarlyair bearings member 40B, allowingmember 40B to ride on its supporting fixedguide member 46B.Air bearings air bearings 36A, etc. - The window frame guide is driven along the X axis on fixed
guides coil 60A which is mounted on windowframe guide member 40A.Motor coil 60A moves in amagnetic track 62A which is located in (or along) fixedguide 64A. Similarly,motor coil 60B which is mounted on windowframe guide member 40B moves inmagnetic track 62B which is located infixed guide 64B. The motor coil and track combinations are part no. LM-310 from Trilogy Company of Webster Tex. These motors are also called “linear commutator motors”. Thetracks stage 10 and the corresponding motor coils on the window frame guide members, at a penalty of reduced performance. - Similarly,
stage 10 moves along the Y axis in FIG. 1 by means ofmotor coils stage 10.Motor coil 68A moves inmagnetic track 70A mounted in windowframe guide member 40C.Motor coil 68B moves inmagnetic track 70B mounted in windowframe guide member 40D. - Also shown in FIG. 1 are
air bearings frame guide member 40A and minimizes friction between windowframe guide member 40A and its fixedguide 64A. Similarly twoair bearings 72B and 72C on windowframe guide member 40B minimize its friction with the fixedguide 64B. The use of asingle air bearing 72A at one end and two opposingair bearings 72B and 72C at the other end allows a certain amount of yaw (rotation in the X-Y plane about the Z-axis) as well as limited motion along the Z-axis. In this case, typically air bearing 72A is gimbal mounted, or gimbal mounted with the gimbal located on a flexure so as to allow a limited amount of misalignment between themember 40A and fixedguide 64A. - The use of the
air bearing 72 A opposing bearings 72B and 72C provides a loading effect to keep the window frame guide in its proper relationship to fixedguides air bearing 76A loads opposingair bearings 76B and 76C, all mounted on side surfaces of thestage 10, in maintaining the proper location ofstage 10 relative to the opposing windowframe guide members Air bearings - The
outer structure 80 in FIG. 1 is the base support structure for the fixed guides 46A, 46B, 64A, 64B and the windowframe guide members 40A, . . . , 40D of the stage mechanism, but does not supportstage base structure 32. Thus the underlying support is partitioned so the reaction force onbase support structure 80 does not couple into thestage base structure 32.Base support structure 80 is supported by its own support pillars or other conventional support elements (not shown in this drawing) to the ground, i.e. the surface of the earth or the floor of a building. An example of a suitable support structure is disclosed in above-referenced U.S. patent application Ser. No. 08/221,375 at FIGS. 1, 1B, 1C. This independent support structure for this portion of stage mechanism provides the above-described advantage of transmitting the reaction forces of the reticle stage mechanism drive motors away from the frame supporting the other elements of the photolithography apparatus, especially away from the optical elements including the projection lens and from the wafer stage, thereby minimizing vibration forces on the projection lens due to reticle stage movement. This is further described below. - The drive forces for the stage mechanism are provided as close as possible through the stage mechanism center of gravity. As can be understood, the center of gravity of the stage mechanism moves with the
stage 10. Thus thestage 10 and the window frame guide combine to define a joint center of gravity. A first differential drive control (not shown) formotor coils motor coil motor coils stage 10 to control the force exerted by eachmotor coil stage 10 has a substantial range of movement, that the differential drive for the motor coils 60A, 60B has a wide differential swing. In contrast, the window frame guide has a more limited range of movement, hence the differential drive for the motor coils 68A, 68B has a much lesser differential swing, providing a trim effect. Advantageously, use of the window frame guide maintains the reaction forces generated by movement of the reticle stage mechanism in a single plane, thus making easier to isolate these forces from other parts of the photolithography apparatus. - FIG. 2 shows a cross-sectional view through line2-2 of FIG. 1. The structures shown in FIG. 2 which are also in FIG. 1 have identical reference numbers and are not described herein. Also shown in FIG. 2 is the illuminator 90 which is a conventional element shown here without detail, and omitted from FIG. 1 for clarity. Also shown without detail in FIG. 2 is the upper portion of the projection lens (barrel) 92. It is to be understood that the lower portion of the projection lens and other elements of the photolithography apparatus are not shown in FIG. 2, but are illustrated and described below.
- The supporting
structure 94 for theprojection lens 92 is also shown in FIG. 2. As can be seen,structure 94 is separated at all points by aslight gap 96 from thebase support structure 80 for the reticle stage mechanism. Thisgap 96 isolates vibrations caused by movement of the reticle stage mechanism from theprojection lens 92 and itssupport 94. As shown in FIG. 2,stage 10 is not in this embodiment a flat structure but defines the underside relievedportion 22 to accommodate the upper portion oflens 92.Magnetic track 70A is mounted on top of thewindow frame guide 40B and similarlymagnetic track 70B is mounted on top of the opposite windowframe guide member 40D. - FIGS. 3A and 3B are enlarged views of portions of FIG. 2, with identical reference numbers; FIG. 3A is the left side of FIG. 2 and FIG. 3B is the right side of FIG. 2. Shown in FIG. 3A is the spring mounting78 for
air bearing 76A. Air bearing 78A being spring mounted to a side surface ofstage 10, this allows a certain amount of yaw (rotation in the X-Y plane about the Z-axis) as well as limited motion along the Z-axis. A gimbal mounting may be used in place of or in addition to thespring 78. The spring or gimbal mounting thereby allows for a limited amount of misalignment betweenstage 10 andmembers - FIG. 4 is a top view of a photolithography apparatus including the stage mechanism of FIGS. 1 and 2 and further including, in addition to the elements shown in FIG. 1, the supporting
base structure 100 which supports the photolithographyapparatus including frame 94 except for the reticle stage mechanism. (Not all the structures shown in FIG. 1 are labelled in FIG. 4, for simplicity.)Base structure 100 supports fourvertical support pillars bracket structures base structure 100 is fairly large, i.e. approximately 3 meters top to bottom in one embodiment. Eachpillar supports - In FIGS. 4 and 5 the full extent of the supporting
structure 94 can be seen along with itssupport pillars base structure 100 which is in contact with the ground via a conventional foundation (not shown). The independent support structure for the reticle stagebase support structure 80 is shown, in FIG. 4 only (for clarity) and similarly includes a set of fourpillars bracket structures base support structure 80 down to thebase structure 100. - The lower portion of FIG. 5 shows the
wafer stage 120 and associatedsupport structures wafer stage 120 conventionally include (not labelled in the drawing) a base, the stage itself, fixed stage guides located on the base, magnetic tracks located on the fixed stage guides, and motor coils fitting in the magnetic tracks and connected to the stage itself. Laser beams fromlaser 124 mounted onsupport 126 locatelens 92 and the stage itself by interferometry. - FIG. 6A shows detail of one of the window frame guide hinged flexure structures, e.g.44C, in a top view (corresponding to FIG. 1). Each of
hinges - Each individual flexure is e.g. ¼ hard 302 stainless steel approximately 20 mils (0.02 inch) thick and can sustain a maximum bend of 0.5 degree. The width of each flexure is not critical; a typical width is 0.5 inch. Two, three or four flexures are used at each
hinge individual flexures clamps members individual flexures frame members - Note that the
frame members frame members metal flexures - In an alternate embodiment, the window frame guide is not hinged but is a rigid structure. To accommodate this rigidity and prevent binding, one of
bearings 72C or 72B is eliminated, and the remaining bearing moved to the center ofmember 40B, mounted on a gimbal with no spring. The other bearings (except those mounted on stage 10) are also gimballed. - This disclosure is illustrative and not limiting; further modifications will be apparent to one skilled in the art in light of this disclosure and are intended to fall within the scope of the appended claims.
Claims (15)
1. A stage mechanism capable of precision motion, comprising:
a base defining a principal surface;
a movable stage located on the principal surface of the base;
a frame of four members connected together and laterally surrounding the stage, a first and second of the members being opposing and in slidable contact with the stage; and
first and second fixed guides mounted spaced apart and parallel to each other, a third and fourth of the members being opposing and in slidable contact with respectively the first and second fixed guides.
2. The stage mechanism of , wherein the first and second members are each connected to both the third and fourth members by flexures, thereby allowing movement of each member relative to the other members.
claim 1
3. The stage mechanism of , wherein each flexure comprises at least two strips of metal, the two strips each being connected to two of the members, and the two strips overlying one another in an X configuration.
claim 2
4. The stage mechanism of , further comprising a plurality of fluid bearings located on an underside of the stage and confronting the base.
claim 1
5. The stage mechanism of , further comprising at least two fluid bearings located on each of the third and fourth members and confronting, respectively, surfaces of the first and second fixed guides.
claim 1
6. The stage mechanism of , further comprising a first motor element on each of the third and fourth members, thereby driving the frame relative to the first and second fixed guides.
claim 1
7. The stage mechanism of , further comprising a second motor element on the base and associated with each of the respectively first and second fixed guides co-operating with one of the first motor elements.
claim 6
8. The stage mechanism of , further comprising a first motor element located on opposing sides of the stage confronting respectively the first and second members, thereby driving the stage relative to the first and second members.
claim 1
9. The stage mechanism of , further comprising a fluid bearing spring mounted on one of the third and fourth members and confronting a surface of one of the first and second fixed guides, thereby loading the frame against the first and second fixed guides.
claim 1
10. The stage mechanism of , further comprising a support base for the first and second fixed guides and the frame members, the support base being supported independently of the base on which the stage is located.
claim 1
11. A method of operating a stage capable of precision movement in two perpendicular directions, comprising the steps of:
locating the stage on a base;
laterally surrounding the stage with a frame in slidable contact with the stage;
driving the frame in a first of the two perpendicular directions relative to the base; and
driving the stage in a second of the two perpendicular directions relative to the frame.
12. The method of , the frame being adapted for flexing in the two perpendicular directions.
claim 11
13. The method of , further comprising supporting the base independently from the frame.
claim 11
14. A hinged frame structure, capable of deformation, comprising:
four rigid frame members arranged in a rectangle, each frame member near each of its ends defining an angular structure lying adjacent a similar angular structure of an adjacent frame member; and
at least two metal flexures connecting each two adjacent angular structures, wherein the two metal flexures cross in an X configuration.
15. The hinged frame structure of , wherein each metal flexure is of stainless steel less than 0.05 inches thick.
claim 14
Priority Applications (3)
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US09/836,273 US6316901B2 (en) | 1995-04-04 | 2001-04-18 | Exposure apparatus and method utilizing isolated reaction frame |
US09/964,550 US6683433B2 (en) | 1995-04-04 | 2001-09-28 | Exposure apparatus and method utilizing isolated reaction frame |
US10/611,260 US6747732B1 (en) | 1995-04-04 | 2003-07-02 | Method of making exposure apparatus with dynamically isolated reaction frame |
Applications Claiming Priority (3)
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US08/416,558 US5874820A (en) | 1995-04-04 | 1995-04-04 | Window frame-guided stage mechanism |
US09/192,153 US6246202B1 (en) | 1995-04-04 | 1998-11-12 | Method of making exposure apparatus with dynamically isolated reaction frame |
US09/836,273 US6316901B2 (en) | 1995-04-04 | 2001-04-18 | Exposure apparatus and method utilizing isolated reaction frame |
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US09/192,153 Division US6246202B1 (en) | 1994-04-01 | 1998-11-12 | Method of making exposure apparatus with dynamically isolated reaction frame |
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US09/964,550 Division US6683433B2 (en) | 1995-04-04 | 2001-09-28 | Exposure apparatus and method utilizing isolated reaction frame |
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US09/192,153 Expired - Lifetime US6246202B1 (en) | 1994-04-01 | 1998-11-12 | Method of making exposure apparatus with dynamically isolated reaction frame |
US09/317,847 Expired - Lifetime US6087797A (en) | 1995-04-04 | 1999-05-25 | Exposure method, and method of making exposure apparatus having dynamically isolated reaction frame |
US09/318,622 Expired - Lifetime US6150787A (en) | 1995-04-04 | 1999-05-26 | Exposure apparatus having dynamically isolated reaction frame |
US09/318,623 Expired - Lifetime US6188195B1 (en) | 1995-04-04 | 1999-05-26 | Exposure method, and method of making exposure apparatus having dynamically isolated support structure |
US09/320,842 Expired - Lifetime US6020710A (en) | 1995-04-04 | 1999-05-26 | Exposure method, and method of making exposure apparatus having dynamically isolated reaction frame |
US09/320,703 Expired - Lifetime US6175404B1 (en) | 1995-04-04 | 1999-05-27 | Exposure apparatus having dynamically isolated reaction frame |
US09/320,706 Expired - Lifetime US6151105A (en) | 1995-04-04 | 1999-05-27 | Exposure apparatus having dynamically isolated support structure |
US09/836,273 Expired - Lifetime US6316901B2 (en) | 1995-04-04 | 2001-04-18 | Exposure apparatus and method utilizing isolated reaction frame |
US09/964,550 Expired - Fee Related US6683433B2 (en) | 1995-04-04 | 2001-09-28 | Exposure apparatus and method utilizing isolated reaction frame |
US10/611,260 Expired - Fee Related US6747732B1 (en) | 1995-04-04 | 2003-07-02 | Method of making exposure apparatus with dynamically isolated reaction frame |
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US08/416,558 Expired - Lifetime US5874820A (en) | 1994-04-01 | 1995-04-04 | Window frame-guided stage mechanism |
US09/192,153 Expired - Lifetime US6246202B1 (en) | 1994-04-01 | 1998-11-12 | Method of making exposure apparatus with dynamically isolated reaction frame |
US09/317,847 Expired - Lifetime US6087797A (en) | 1995-04-04 | 1999-05-25 | Exposure method, and method of making exposure apparatus having dynamically isolated reaction frame |
US09/318,622 Expired - Lifetime US6150787A (en) | 1995-04-04 | 1999-05-26 | Exposure apparatus having dynamically isolated reaction frame |
US09/318,623 Expired - Lifetime US6188195B1 (en) | 1995-04-04 | 1999-05-26 | Exposure method, and method of making exposure apparatus having dynamically isolated support structure |
US09/320,842 Expired - Lifetime US6020710A (en) | 1995-04-04 | 1999-05-26 | Exposure method, and method of making exposure apparatus having dynamically isolated reaction frame |
US09/320,703 Expired - Lifetime US6175404B1 (en) | 1995-04-04 | 1999-05-27 | Exposure apparatus having dynamically isolated reaction frame |
US09/320,706 Expired - Lifetime US6151105A (en) | 1995-04-04 | 1999-05-27 | Exposure apparatus having dynamically isolated support structure |
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US09/964,550 Expired - Fee Related US6683433B2 (en) | 1995-04-04 | 2001-09-28 | Exposure apparatus and method utilizing isolated reaction frame |
US10/611,260 Expired - Fee Related US6747732B1 (en) | 1995-04-04 | 2003-07-02 | Method of making exposure apparatus with dynamically isolated reaction frame |
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KR100314555B1 (en) | 2001-11-17 |
KR100314553B1 (en) | 2001-11-15 |
KR100300220B1 (en) | 2001-11-30 |
US6188195B1 (en) | 2001-02-13 |
US6175404B1 (en) | 2001-01-16 |
US6151105A (en) | 2000-11-21 |
US6747732B1 (en) | 2004-06-08 |
KR100314554B1 (en) | 2001-11-30 |
KR100314552B1 (en) | 2001-11-15 |
US6020710A (en) | 2000-02-01 |
JPH08330224A (en) | 1996-12-13 |
US20020017889A1 (en) | 2002-02-14 |
US6087797A (en) | 2000-07-11 |
US6683433B2 (en) | 2004-01-27 |
US6316901B2 (en) | 2001-11-13 |
US20040095085A1 (en) | 2004-05-20 |
US6246202B1 (en) | 2001-06-12 |
JP2006313940A (en) | 2006-11-16 |
US5874820A (en) | 1999-02-23 |
JP3867676B2 (en) | 2007-01-10 |
KR960039104A (en) | 1996-11-21 |
JP2003264147A (en) | 2003-09-19 |
US6150787A (en) | 2000-11-21 |
JP3969455B2 (en) | 2007-09-05 |
KR100314556B1 (en) | 2001-11-16 |
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