Source: http://www.google.com/patents/US8120751?dq=5,687,325
Timestamp: 2016-06-01 04:12:33
Document Index: 103125971

Matched Legal Cases: ['art 161', 'Application No. 2005', 'Application No. 2005', 'Application No. 2005', 'Application No. 04747525', 'Application No. 200480023880', 'Application No. 10', 'Application No. 093120551', 'Application No. 04747525', 'Application No. 04747525', 'Application No. 04747525', 'Application No. 200910140881', 'Application No. 200480023880', 'Application No. 2005', 'Application No. 093120551', 'Application No. 04747525']

Patent US8120751 - Coupling apparatus, exposure apparatus, and device fabricating method - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn exposure apparatus fills a space between a projection optical system and a substrate with a liquid and projects a pattern image onto the substrate to expose the substrate. The projection optical system has a first group including an optical member that comes into contact with the liquid, and a second...http://www.google.com/patents/US8120751?utm_source=gb-gplus-sharePatent US8120751 - Coupling apparatus, exposure apparatus, and device fabricating methodAdvanced Patent SearchPublication numberUS8120751 B2Publication typeGrantApplication numberUS 12/585,498Publication dateFeb 21, 2012Filing dateSep 16, 2009Priority dateJul 9, 2003Fee statusLapsedAlso published asCN102944981A, DE602004030247D1, EP1643543A1, EP1643543A4, EP1643543B1, US7619715, US8228484, US20060103944, US20060126045, US20080186465, US20100007865, US20100134771, WO2005006416A1Publication number12585498, 585498, US 8120751 B2, US 8120751B2, US-B2-8120751, US8120751 B2, US8120751B2InventorsKazuya Ono, Yuichi ShibazakiOriginal AssigneeNikon CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (206), Non-Patent Citations (37), Referenced by (2), Classifications (9), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetCoupling apparatus, exposure apparatus, and device fabricating method
US 8120751 B2Abstract
An exposure apparatus fills a space between a projection optical system and a substrate with a liquid and projects a pattern image onto the substrate to expose the substrate. The projection optical system has a first group including an optical member that comes into contact with the liquid, and a second group that differs from the first group. The first group is supported by a first support member via a vibration isolating apparatus.
a projection optical system that has a first group including an optical member that contacts a liquid, and a second group that differs from the first group;
a substrate stage that is movable with respect to the optical member while the optical member contacts the liquid;
a support mechanism that supports the first group and the second group so that the first group and the second group are substantially isolated from each other; and
a drive mechanism that adjusts a position of the first group so that a predetermined relationship between the first group and the second group is maintained, the position of the first group being changed due to a pressure change in the liquid.
2. The exposure apparatus according to claim 1, wherein the support mechanism has a first support member that supports the first group, and a second support member that supports the second group and that is different from the first support member.
a first base member that movably and noncontactually supports the substrate stage,
wherein the first support member is affixed to the first base member.
4. The exposure apparatus according to claim 2, further comprising:
a first base member that movably and noncontactually supports the substrate stage; and
a second base member that supports the first base member,
wherein first support member is affixed to the second base member.
5. The exposure apparatus according to claim 4, wherein the first base member and the second base member are isolated so that vibrations do not mutually transmit.
6. The exposure apparatus according to claim 2, wherein the first support member noncontactually supports the first group.
a measuring apparatus that measures a positional relationship between the first group and the second group.
8. The exposure apparatus according to claim 7, wherein the drive mechanism drives the first group based on a measurement result of the measuring apparatus.
9. The exposure apparatus according to claim 7, wherein the measuring apparatus has an interferometer system that measures the position of the first group.
the support mechanism has a first support member that supports the first group, and
the interferometer system measures a position of the first support member.
11. The exposure apparatus according to claim 8, wherein the drive mechanism has a voice coil motor.
12. The exposure apparatus according to claim 1, wherein the predetermined relationship comprises a gap between the first group and the second group.
a first support member that supports the first group;
a second support member that supports the second group and that is different from the first support member;
a frame member that supports the second support member; and
a linking device that is disposed between the first support member and the frame member and links the first support member and the frame member.
14. The exposure apparatus according to claim 13, wherein the linking device comprises a parallel link mechanism.
15. The exposure apparatus according to claim 13, wherein the linking device comprises a vibration isolating mechanism so that vibrations of one of the first support member and the frame member do not transmit to the other.
16. The exposure apparatus according to claim 15, wherein the vibration isolating mechanism functions dynamically.
17. The exposure apparatus according to claim 15, wherein the vibration isolating mechanism functions passively.
18. The exposure apparatus according to claim 15, wherein the vibration isolating mechanism detects at least one of a plurality of physical quantities and performs vibration isolation based on the detected at least one physical quantity.
19. The exposure apparatus according to claim 15, wherein the vibration isolating mechanism has a counter-mass that absorbs the vibrations of the one of the first support member and the frame member.
the linking device has a first linking member linked to the first support member, and a second linking member linked to the frame member; and
the first and second linking members and the counter-mass are movable relative to a common predetermined direction, and are mechanically guided in a direction that is different from the predetermined direction.
21. The exposure apparatus according to claim 20, wherein an air guide is used to guide in a direction that is different from the predetermined direction.
22. The exposure apparatus according to claim 13, wherein the linking device is capable of expanding and contracting.
23. The exposure apparatus according to claim 1, wherein an immersion area is formed at only a part on the substrate during exposure of the substrate.
24. The exposure apparatus according to claim 1, wherein the optical member comprises a plane parallel plate.
25. The exposure apparatus according to claim 1, wherein the optical member comprises a lens.
26. A device fabricating method that uses the exposure apparatus according to claim 1.
an optical member that contacts a liquid;
a projection optical system body;
a first support member that supports the optical member;
a second support member that supports the projection optical system body;
a frame member that supports the second support member;
a linking device that is disposed between the first support member and the frame member and links the first support member and the frame member; and
a drive mechanism that adjusts a position of the optical member to maintain a predetermined state of a positional relationship between the projection optical system body and the optical member, the position of the optical member being changed due to a pressure change in the liquid.
28. The exposure apparatus according to claim 27, further comprising:
a substrate stage that is movable with respect to the optical member while the optical member contacts the liquid.
29. The exposure apparatus according to claim 27, further comprising:
a measuring apparatus that measures the positional relationship between the optical member and the projection optical system body.
30. The exposure apparatus according to claim 29, wherein the drive mechanism adjusts the position of the optical member based on a measurement result of the measuring apparatus.
31. The exposure apparatus according to claim 29, wherein the measuring apparatus has an interferometer system that measures the position of the optical system.
32. The exposure apparatus according to claim 31, wherein the interferometer system measures a position of the first support member with respect to the second support member.
33. The exposure apparatus according to claim 27, wherein the drive mechanism is provided at the linking device.
34. The exposure apparatus according to claim 33, wherein the drive mechanism has a voice coil motor.
35. The exposure apparatus according to claim 33, wherein the drive mechanism maintains a predetermined state of a gap between the projection optical system body and the optical system.
36. The exposure apparatus according to claim 33, wherein the linking device comprises a vibration isolating mechanism so that vibrations of one of the first support member and the frame member do not transmit to the other.
37. The exposure apparatus according to claim 27, wherein the linking device comprises a vibration isolating mechanism so that vibrations of one of the first support member and the frame member do not transmit to the other.
38. The exposure apparatus according to claim 37, wherein the vibration isolating mechanism functions dynamically.
39. The exposure apparatus according to claim 37, wherein the vibration isolating mechanism functions passively.
40. The exposure apparatus according to claim 37, wherein the vibration isolating mechanism detects at least one of a plurality of physical quantities and performs vibration isolation based on the at least one detected physical quantity.
41. The exposure apparatus according to claim 37, wherein the vibration isolating mechanism has a counter-mass that absorbs the vibrations of the one of the first support member and the frame member.
42. The exposure apparatus according to claim 41, wherein
the first and second linking members and the counter-mass are movable in a common predetermined direction, and are mechanically guided in a direction that is different from the predetermined direction.
43. The exposure apparatus according to claim 42, wherein an air guide is used to guide in a direction that is different from the predetermined direction.
44. The exposure apparatus according to claim 37, wherein the vibration isolating mechanism is built in the linking device.
45. The exposure apparatus according to claim 44, wherein the linking device comprises a parallel link mechanism having the drive mechanism.
46. The exposure apparatus according to claim 45, wherein the parallel link mechanism is capable of expanding and contracting.
47. The exposure apparatus according to claim 27, wherein an immersion area is formed at only a part on a substrate during exposure of the substrate.
48. The exposure apparatus according to claim 27, wherein the optical member comprises a plane parallel plate.
49. The exposure apparatus according to claim 27, wherein the optical member comprises a lens.
50. A device fabricating method that uses the exposure apparatus according to claim 27. Description
This is a Division of application Ser. No. 11/322,125 filed Dec. 30, 2005 (now U.S. Pat. No. 7,619,715), which in turn is a Continuation of International Application No. PCT/JP2004/010059, filed Jul. 8, 2004, which claims priority to Japanese Patent Application Nos. 2003-272615 (filed on Jul. 9, 2003) and 2003-281182 (filed on Jul. 28, 2003). The disclosures of the aforementioned applications are incorporated herein by reference in their entireties.
If the depth of focus δ becomes excessively small, then it will become difficult to align the surface of the substrate with the image plane of the projection optical system, and there will be a risk of insufficient margin of focus during the exposure operation. Accordingly, a liquid immersion method has been proposed, as disclosed in, for example, PCT International Publication No. WO99/49504 (Patent Document 1), as a method to substantially shorten the exposure wavelength and increase the depth of focus. In this liquid immersion method, the space between the lower surface of the projection optical system and the substrate surface is filled with a liquid such as water or any organic solvent to utilize the fact that the wavelength of the exposure light beam in the liquid is 1/n as compared with that in the air (n represents the refractive index of the liquid, which is about 1.2 to 1.6 in ordinary cases) so that the resolution is improved and the depth of focus is magnified about n times. Furthermore, the contents of the above-mentioned Patent Document 1 are hereby incorporated by reference in its entirety to the extent permitted by the laws or regulations of the states designated or elected by the present international patent application.
The present invention was created considering such circumstances, and has a first object to provide an apparatus that couples two objects so that the vibration of one object does not transmit to the other object. In addition, the present invention has a second object to provide an exposure apparatus that can suppress the degradation of the pattern image when filling a liquid between a projection optical system and a substrate and performing an exposure, and a device fabricating method that uses this exposure apparatus.
FIG. 1 is a schematic block diagram showing the first embodiment of an exposure apparatus of the present invention.
The following explains the exposure apparatus and a device fabricating method of the present invention, referencing the drawings. However, the present invention is not limited to the embodiments below; for example, the constituent elements of these embodiments may be suitably combined.
(First Embodiment of the Exposure Apparatus)
FIG. 1 is a schematic block diagram that depicts the first embodiment of the exposure apparatus according to the present invention.
Here, as an example, the present embodiment explains a case of using, as the exposure apparatus EX, a scanning type exposure apparatus (a so-called scanning stepper) that, while synchronously moving the mask M and the substrate P in mutually different directions (opposite directions) in the scanning direction, exposes the substrate P with the pattern formed on the mask M. In the following explanation, the direction that coincides with an optical axis AX of the projection optical system PL is the Z axial direction, the direction in which the mask M and the substrate P synchronously move in the plane perpendicular to the Z axial direction (the scanning direction) is the X axial direction, and the direction perpendicular to the Z axial direction and the X axial direction (the non-scanning direction) is the Y axial direction. In addition, the rotational (inclined) directions around the X, Y, and Z axes are the θX, θY, and θZ directions, respectively. Furthermore, “substrate” herein includes one in which a semiconductor wafer is coated with a photoresist, and “mask” includes a reticle wherein is formed a device pattern that is reduction projected onto the substrate.
Furthermore, in the configuration depicted in FIG. 4, a vibration isolating apparatus the same as the vibration isolating apparatuses 44, 46 may be provided between the support frame 47 and the stage base 53, and an elastic member, such as rubber, may be disposed so that vibrations that do transmit between the support frame 47 and the stage base 53 are attenuated.
(Second Embodiment of the Exposure Apparatus)
FIG. 7 is a schematic block diagram that depicts the second embodiment of the exposure apparatus according to the present invention.
As an example, the present embodiment explains a case of using, as the exposure apparatus EX2, a scanning type exposure apparatus (a so-called scanning stepper) that, while synchronously moving the mask M2 and the substrate P2 in mutually different directions (opposite directions) in the scanning direction, exposes the substrate P2 with the pattern formed on the mask M2. In the following explanation, the direction that coincides with an optical axis AX2 of the projection optical system PL2 is the Z axial direction, the direction in which the mask M2 and the substrate P2 synchronously move in the plane perpendicular to the Z axial direction (the scanning direction) is the X axial direction, and the direction perpendicular to the Z axial direction and the X axial direction (the non-scanning direction) is the Y axial direction. In addition, the rotational (inclined) directions around the X, Y, and Z axes are the θX, θY, and θZ directions, respectively. Furthermore, “substrate” herein includes one in which a semiconductor wafer is coated with a photoresist, which is a photosensitive material, and “mask” includes a reticle wherein is formed a device pattern that is reduction projected onto the substrate.
The projection optical system PL2 projects and exposes the pattern of the mask M2 onto the substrate P2 with a predetermined projection magnification β. In the present embodiment, the projection optical system PL2 is a reduction system having a projection magnification P of, for example, � or ⅕. Furthermore, the projection optical system PL2 may be either a unity magnification system or an enlargement system. The projection optical system PL2 includes: the optical element (first group) 102 disposed on the terminal side (the substrate P2 side) thereof and that contacts the liquid 101; and an optical group (second group) MPL2 that includes a plurality of optical elements disposed between the optical member 102 and the mask M2 having a pattern. Furthermore, in the present embodiment, the first group has only the optical member 102, i.e., only one lens element (optical element). A metal lens cell (first holding member) LS2 holds the lens element 102. The lens cell LS2 is made of metal, and a spring mechanism (not shown) is interposed between the lens cell LS2 and the lens element 102. Further, a lens barrel (second holding member) PK2 holds the optical group MPL2. The lens cell LS2 and the lens barrel PK2 are isolated.
In the present embodiment, when each link part 161 is expanded and contracted, and the attitude of the lens element 102 held by the lens cell LS2 is controlled, only the first voice coil motor 172 is driven, and the second voice coil motor 173 is not driven, as discussed above. In other words, when controlling the attitude of the lens element 102, electric power for its control is supplied only to the first voice coil motor 172, and hardly any (or no) electric power is supplied to the second voice coil motor 173. Furthermore, when moving the first voice coil motor 172 for controlling the attitude of the lens element 102, for example, toward the arrow J1 side in FIG. 11, then the tubular member 167 moves toward the arrow J2 side. At this time, the second linking member 166 linked to the lens barrel base plate 108 does not move. Depending on the scanning exposure conditions, there is a possibility that the tubular member 167 will continue to move only in, for example, the arrow J2 direction. In that case, there is a possibility that the first linking member 164 will disconnect from the tubular member 167 if the relative position gap between the tubular member 167 and the first and second linking members 164, 166 increases. Therefore, when the relative position between the tubular member 167 and the first and second linking members 164, 166 exceeds a permissible value, the control apparatus CONT2 corrects the position of the tubular member 167 by driving the second voice coil motor 173. Furthermore, the second voice coil motor 173 may be driven with a timing other than the exposure operation, such as, for example, during replacement of the substrate, and/or the time from after the exposure of the first shot region until before the exposure of the next second shot region. Furthermore, when the attitude of the lens element 102 (the lens cell LS2) is controlled by the first voice coil motor 172 during exposure, the vacuum apparatus 176 maintains the space 174 at a constant pressure.
Furthermore, instead of a constitution wherein the weight of the lens cell LS2 and its own weight of the first linking member 164 are received by the space 174 negatively pressurized, the first linking member 164 and the second linking member 166 may be linked by, for example, a spring member.
If performing feedforward control, then a test exposure is performed beforehand and a plurality of physical quantities are obtained. Namely, an identification test is performed on the system of the exposure apparatus EX2, and the dynamic characteristics, including the physical quantities of that system, are obtained. In the identification test, the substrate stage PST2 is scanned in a state wherein the immersion area AR2 is formed between the lens element 102 and the substrate P2 using the liquid supply mechanism 110 and the liquid recovery mechanism 120, and the physical quantities are detected using the abovementioned encoders 177, 178 and/or the laser interferometer 182. Furthermore, the voice coil motors 172, 173 are, of course, not driven during the identification test. The detected physical quantities include: the time during the exposure sequence; the position, speed, and acceleration of the substrate P2; the position, speed, and acceleration of the lens element 102; the relative position, the relative speed, and the relative acceleration between the lens element 102 and the substrate P2; and the like. The position, speed, and acceleration values are detected for all X axial, Y axial, Z axial, θX, θY and θZ directions (six degrees of freedom). Furthermore, the detected physical quantities include the amount (volume and mass), for example, of the liquid 1 to be supplied. The plurality of physical quantities detected by the identification test are stored in the control apparatus CONT2. Based on the detected physical quantities, the control apparatus CONT2 determines the control quantities (electric power for control) for driving the voice coil motors 172 (173), and performs the exposure while driving the voice coil motor 172 based on those determined physical quantities so that it vibrationally isolates the optical group MPL2. Thus, the control apparatus CONT2 can use the voice coil motor 172 to perform vibration isolation in accordance with the dynamic characteristics (operation) of the exposure apparatus EX2 itself, and can maintain the positional relationship between the optical group MPL2 and the lens element 102 in the desired state.
In addition, in the embodiments discussed above, an exposure apparatus is used that locally fills liquid between the projection optical systems PL, PL2 and the substrates P, P2, but the present invention is also applicable to a liquid immersion exposure apparatus that moves a stage, which holds the substrate to be exposed, in a liquid bath, as disclosed in Japanese Unexamined Patent Application, First Publication No. H06-124873, as well as to a liquid immersion exposure apparatus that forms a liquid bath having a predetermined depth on the stage, and holds the substrate therein, as disclosed in Japanese Unexamined Patent Application, First Publication No. H 10-303114.
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No. 12/068,323.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8416392Sep 16, 2010Apr 9, 2013Carl Zeiss Smt GmbhOptical imaging arrangementUS20110001949 *Sep 16, 2010Jan 6, 2011Carl Zeiss Smt AgOptical imaging arrangement* Cited by examinerClassifications U.S. Classification355/53, 355/30International ClassificationG03B27/52, G03B27/42, G03F7/20Cooperative ClassificationG03F7/70833, G03F7/70341European ClassificationG03F7/70F24, G03F7/70P2FLegal EventsDateCodeEventDescriptionOct 2, 2015REMIMaintenance fee reminder mailedFeb 21, 2016LAPSLapse for failure to pay maintenance feesApr 12, 2016FPExpired due to failure to pay maintenance feeEffective date: 20160221RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services