WO2006046507A1 - 光学装置、鏡筒、露光装置、及びデバイスの製造方法 - Google Patents
光学装置、鏡筒、露光装置、及びデバイスの製造方法 Download PDFInfo
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- WO2006046507A1 WO2006046507A1 PCT/JP2005/019495 JP2005019495W WO2006046507A1 WO 2006046507 A1 WO2006046507 A1 WO 2006046507A1 JP 2005019495 W JP2005019495 W JP 2005019495W WO 2006046507 A1 WO2006046507 A1 WO 2006046507A1
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- Prior art keywords
- optical element
- optical
- holding member
- support
- element holding
- Prior art date
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Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/143—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation for use with ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0647—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors
- G02B17/0663—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/1822—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors comprising means for aligning the optical axis
- G02B7/1827—Motorised alignment
-
- 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
- G03F7/70766—Reaction force control means, e.g. countermass
-
- 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
Definitions
- the present invention relates to an optical device, and more specifically, an optical element having an asymmetric shape with respect to an optical axis, an optical element holding member that holds the optical element, and at least three supports that support the optical element holding member
- the present invention relates to an optical device including a member, a lens barrel including the optical device, an exposure device including the lens barrel, and a device manufacturing method for performing exposure using the exposure device.
- a plurality of optical elements constituting the projection optical system are supported by a support member via an optical element holding member.
- the conventional optical element holding member supports the three peripheral edge portions of the optical element at equiangular intervals.
- the optical element needs to be held in such a manner that its position in the direction of the optical axis and the posture such as the tilt angle with respect to the optical axis can be precisely adjusted.
- a technology for dynamically supporting an optical element by a movable support member driven by an actuator has been developed. By driving the support member according to environmental changes, the position and posture of the optical element in the optical axis direction can be finely adjusted.
- the resolution Res of the projection exposure apparatus depends on the wavelength of the exposure light and the numerical aperture NA of the projection optical system.
- Resolution Res k ′ ZNA (k: constant) That is, in order to increase the resolution of the projection exposure apparatus, it is necessary to improve the numerical aperture NA and shorten the wavelength of the light source.
- an optical element made of a material having a high transmittance such as quartz glass or calcium fluoride is used.
- a technique for increasing the transmittance by filling the interior of the lens barrel with nitrogen or helium.
- EUV light Extreme Ultra EUVL (EUV Lithography) using Violet (soft X-ray region light) is required.
- E UVL cannot use ordinary optical lenses, quartz glass, and lens materials such as calcium fluoride, so it is necessary to configure the projection optical system with a reflecting mirror placed under vacuum. By using a reflection mirror, extremely short wavelength light such as EUV can be used without reducing the transmittance. Examples of the projection optical system applicable to the exposure apparatus used in EUVL are described in Patent Document 1 and Patent Document 2.
- Patent Document 1 US Patent No. 6485153
- Patent Document 2 US Patent Application Publication No. 2004Z0125353
- the optical element constituting the projection optical system is a reflecting mirror by shortening the wavelength of the light source, it is necessary to bend the optical path in the projection optical system.
- the reflection mirror is arranged to be inclined with respect to the optical axis of the optical element.
- a part of the reflecting mirror may be cut out to secure the optical path. Due to the notch, the reflecting mirror is not rotationally symmetric with respect to the optical axis.
- An asymmetric optical element has a poor balance even if it is supported at three equiangular intervals on the peripheral edge by a conventional optical element holding member. For this reason, optical devices with asymmetric optical elements are susceptible to environmental vibrations, or lack static stability and dynamic stability, such as exhibiting unexpected behavior when adjusting the alignment of optical elements. Conventional optical element holding devices have contributed to a decrease in accuracy of projection exposure apparatuses used in the manufacturing process of highly integrated semiconductor devices.
- the present invention uses an optical device having a well-balanced optical element having a stably held optical element, a lens barrel including the optical device, an exposure apparatus using the lens barrel, and the exposure apparatus. It is to provide a device manufacturing method.
- an optical device having an optical axis, an optical element having an asymmetric shape with respect to the optical axis, and an optical element holding member that holds the optical element And at least three support members that support the optical element holding member, and at least one of the optical element holding member and the optical element has a total weight of the optical element holding member and the optical element,
- An optical device is provided that is configured to apply approximately evenly to at least three support members.
- the at least three support members support the optical element holding member at at least three support positions, respectively, and the center of mass of the optical element holding member and the optical element is The triangular internal force formed by three of the at least three support positions is within a predetermined distance.
- the at least three support members support the optical element holding member at at least three support positions, respectively, and the center of mass of the optical element holding member and the optical element is , Coinciding with the inner center of the triangle formed by three of the at least three support positions.
- the at least three support members respectively support the optical element holding member at at least three support positions
- at least one of the optical element holding member and the optical element includes: A reference plane including the three support positions, a center of mass of the optical unit including the optical element holding member and the optical element with respect to the reference plane, a perpendicular of the reference plane passing through the center of mass, and the reference plane
- the intersection is configured to have a predetermined positional relationship with respect to the triangle formed by the three support positions.
- the intersection point coincides with the inner center of the triangle.
- the intersection point is such that the internal force of the triangle is also within a predetermined distance.
- the intersection is located inside the triangle.
- the at least three support members respectively support the optical element holding member at at least three support positions, and at least one of the optical element holding member and the optical element includes: The center force of the optical element holding member and the optical element is configured to be positioned on a reference plane including a triangle formed by three of the at least three support positions.
- the at least three support members respectively support the optical element holding member at at least three support positions, and at least one of the optical element holding member and the optical element includes: At least one inertia main axis of the inertia main axis of the optical unit including the optical element holding member and the optical element is configured to be positioned in parallel with a reference plane including the at least three support positions.
- the at least three support members respectively support the optical element holding member at at least three support positions
- at least one of the optical element holding member and the optical element includes: The inertial principal axis force of at least one of the principal axes of inertia of the optical unit including the optical element holding member and the optical element is configured to be positioned on a reference plane including the at least three support positions.
- the at least three support members respectively support the optical element holding member at at least three support positions
- at least one of the optical element holding member and the optical element includes: An inertial principal axis force of at least one of inertial principal axes of an optical unit including the optical element holding member and the optical element, configured to intersect with a triangle formed by three support positions of the at least three support positions It is done. It is preferable that all of the principal axes of inertia intersect the triangle.
- At least one of the optical element holding member and the optical element includes a tolerance weight.
- the balance weight is formed integrally with at least one of the optical element holding member and the optical element.
- an optical device having an optical axis, an optical element having an asymmetric shape with respect to the optical axis, an optical element holding member that holds the optical element, and the optical element
- An optical device is provided that includes at least three support members that support a holding member, and a non-weight provided on at least one of the optical element holding member and the optical element.
- the balance weight acts so that the weight of the optical element holding member and the optical element is distributed substantially evenly to the at least three support members. Adjust the weight balance of at least one of the optical elements To do.
- At least one of the optical element holding member and the optical element has a weight of the optical element held by the optical element holding member substantially equal to each of the at least three support members. Configured to join.
- the balance weight is a protrusion formed integrally with at least one of the optical element holding member and the optical element.
- the balance weight is a notch provided in at least a part of the optical element holding member and the optical element.
- an optical device having an optical axis, an optical element having an asymmetric shape with respect to the optical axis, an optical element holding member that holds the optical element, At least three support members that support the optical element holding member, and the three support members distribute the weight of the optical element holding member and the optical element substantially equally to the at least three support members.
- an optical apparatus is provided in which the intervals between the three support members are non-uniformly arranged.
- the present invention further provides a lens barrel including the optical device described above.
- the lens barrel is suitable for use in an exposure apparatus that exposes a pattern image formed on a mask onto a substrate via a projection optical system.
- the present invention further provides a device manufacturing method including a lithographic process for performing exposure using an exposure apparatus.
- optical element is widely composed of an optical material (glass, resin, metal, etc.) as a part for optical equipment.
- optical material glass, resin, metal, etc.
- the description mainly focuses on reflective optical elements (for example, reflective mirrors), but transmissive (refractive) optical elements (for example, lenses, prisms, filters, etc.) and some Also includes optical elements that pass through and reflect the rest (eg, half mirrors, beam splitters, etc.).
- optical axis of the optical element is generally a center line specified for each optical element and means a line including the center of curvature of the spherical surface or aspheric surface of the optical element.
- optical axis of the optical system is a rotationally symmetric axis of the coaxial optical system, and is an optical system (for example, a projection system). It is a continuous axis composed of the central axis of a series of optical elements constituting an optical system.
- optical axis of the optical system is a single straight line that forms the center of the optical path.
- the optical axis of each optical element may coincide with the optical axis of the optical system, but it does not necessarily coincide.
- the center line of the optical path is bent and does not necessarily coincide with the optical axis.
- the optical axis itself is bent.
- multiple rotational symmetry axes can be considered, and the position of the optical axis cannot always be specified in one place. Therefore, if the “optical axis of the optical element” cannot be specified!
- the optical axis of the optical element can be specified but is far away from the “optical axis of the optical system”
- the optical An axis that overlaps the “center line of the optical path” incident on the element may be treated as the “optical axis”.
- the "weight” may be either a positive weight with respect to the support member (a force pressing the optical element holding member against the support member) or a negative weight.
- the weight is not limited to the gravity in the vertical direction, but includes a load caused by a rotational moment generated from the gravity.
- the weights acting on the three support members are completely equal, and the force is different within a range that does not impair the stability of the optical device. Including. For example, the load acting on one support member is less than the sum of the loads acting on the other two support members, the maximum load acting on the three support members is within twice the minimum value, Conditions such that the directions of loads acting on the support member are equal can be set as appropriate in relation to the stability of the optical device.
- Static stability means that an optical element supported by a support member is less likely to vibrate when affected by environmental vibrations. “Dynamic stability” means that the optical element itself is less likely to cause unexpected and unintended behavior when it is displaced by a support member for alignment adjustment or the like.
- the center of mass of the optical element held by the optical element holding member means “the optical element The center of mass of the rigid body (hereinafter referred to as the “virtual rigid body”) when the optical element held by the element holding member is mechanically integrated as a unit (hereinafter referred to as “virtual rigid body”).
- “center of gravity” and “center of mass” are considered to be the same position.
- Triangle inner center is the point where the bisectors of the three corners of the triangle intersect each other, are at equal distances from each side, and serve as the center of motion of the rigid body supported by the three support members. is assumed.
- FIG. 1 is a block diagram of an exposure apparatus according to a preferred embodiment.
- FIG. 2 is a perspective view of the projection optical system PO.
- FIG. 3 is a perspective view of mirrors M1 to M6.
- FIG. 4 is a sectional view of the projection optical system PO.
- FIG. 5 is a partially broken perspective view of a lens barrel unit.
- FIG. 6 is a bottom view of the mirror holding mechanism.
- FIG. 7 is a schematic diagram of the mirror holding mechanism shown in FIG.
- FIG. 8 is a schematic diagram of the mirror holding mechanism shown in FIG.
- FIG. 9 is a schematic diagram of an optical device according to a second embodiment.
- FIG. 10 is a schematic diagram of an optical device according to a third embodiment.
- FIG. 11 is a schematic diagram of an optical device according to a fourth embodiment.
- FIG. 12 is a schematic diagram of an optical device according to a fifth embodiment.
- FIG. 13 is a schematic diagram of an optical device according to a sixth embodiment.
- FIG. 14 is a schematic diagram of an optical device according to a seventh embodiment.
- FIG. 15 is a schematic diagram of an optical device according to an eighth embodiment.
- FIG. 16 is a schematic diagram of an optical device according to a ninth embodiment.
- FIG. 17 is a schematic diagram of an optical device according to a tenth embodiment.
- FIG. 18 is a schematic diagram of an optical device according to an eleventh embodiment.
- FIG. 19 is a schematic diagram of an optical device according to a twelfth embodiment.
- FIG. 20 is a plan view of another example of an optical device. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows an overall configuration of an exposure apparatus 10 according to the first embodiment.
- the exposure apparatus 10 includes a projection optical system PO.
- the optical axis direction (vertical direction) with respect to the wafer W of the projection optical system PO is defined as the Z-axis direction, and in the plane orthogonal to this, the horizontal direction in FIG. To do.
- “6 degrees of freedom” means the displacement in the X-axis direction ( ⁇ ), the displacement in the Y-axis direction (Ay), the displacement in the Z-axis direction ( ⁇ ), and the rotation around the ⁇ axis (0 x) , Rotation around the Y axis (6 y), and rotation around the Z axis ( ⁇ z).
- the exposure apparatus 10 projects a partial image of the circuit pattern formed on the reticle R functioning as a mask onto the wafer W via the projection optical system PO.
- the projection optical system PO By stepping the reticle R and the wafer W relative to the projection optical system PO in a one-dimensional direction (Y-axis direction), the entire circuit pattern of the reticle R is stepped into each of a plurality of shot areas on the wafer W. 'And • Transfer using the scan method.
- the exposure apparatus 10 includes a light source device 12, an illumination optical system, a projection optical system PO, a reticle stage RST, and a wafer stage WST.
- the light source device 12 generates EUV exposure light EL.
- the illumination optical system makes the exposure light EL enter the pattern surface of the reticle R (the lower surface in FIG. 1 (one Z side surface)) at a predetermined incident angle, for example, about 50 mrad.
- the bending mirror BM that reflects the exposure light EL toward the pattern surface of the reticle R functions as a part of the force illumination optical system arranged in the lens barrel 52 that holds the projection optical system PO.
- Reticle stage RST holds reticle R.
- the projection optical system PO projects the exposure light EL reflected by the pattern surface of the reticle R onto the exposed surface of the wafer W (the upper surface in FIG. 1 (+ Z side surface)).
- Wafer stage WST holds wafer W.
- An example of the light source device 12 is a laser excitation plasma light source.
- a laser-excited plasma light source irradiates EUV photogenerator (target) with high-intensity laser light to excite the target into a high-temperature plasma state and emit EUV light and ultraviolet light emitted from the target. , Visible light, and light in other wavelength ranges.
- the exposure light EL of the first embodiment is mainly a EUV light beam having a wavelength of 5 to 20 nm, for example, a wavelength of l nm.
- the illumination optical system includes an illumination mirror (not shown), a wavelength selection window (not shown), and a bending mirror. 1 Including BM.
- the parabolic mirror as a condensing mirror in the light source device 12 functions as a part of the illumination optical system.
- the illumination optical system illuminates the pattern surface of the reticle R with the exposure light EL converted into a circular slit-shaped illumination light.
- Reticle stage RST is arranged on reticle stage base 32 arranged in the XY plane.
- the reticle stage RST is supported on the reticle stage base 32 by a magnetic levitation force generated by, for example, a magnetic levitation type two-dimensional linear actuator constituting the reticle stage drive unit 34.
- Reticle stage RST is driven with a predetermined stroke in the Y-axis direction by the driving force generated by reticle stage drive unit 34, and can also be driven in minute amounts in the X-axis direction and ⁇ z direction (rotation direction around the Z-axis). It is.
- An electrostatic chuck (or mechanical chuck) reticle holder (not shown) is provided on the lower surface of the reticle stage RST.
- Reticle R is held by the reticle holder.
- An example of reticle R is a reflective reticle adapted to EUV exposure light EL with a wavelength of 1 lnm.
- Reticle R is held by a reticle holder with its pattern surface being the bottom surface.
- the reticle R also has a thin plate strength such as silicon wafer, quartz, and low expansion glass.
- a reflective film that reflects EUV light is formed on the surface (pattern surface) of the reticle R on the Z side.
- This reflective film is a multilayer film in which about 50 pairs of molybdenum Mo and beryllium Be films are alternately laminated with a period of about 5.5 nm.
- This multilayer film has a reflectivity of about 70% for EUV light with a wavelength of 1 lnm.
- a multilayer film having the same configuration is also formed on the reflecting surface of each mirror in the bending mirror BM, mirrors M1 to M6, and other illumination optical systems.
- An absorption layer made of, for example, nickel (Ni) or aluminum (A1) is applied to one surface of the multilayer film formed on the pattern surface of the reticle R.
- the absorbing layer is patterned to expose the reflective film in a shape corresponding to the circuit pattern.
- EUV light striking the absorption layer of Reticunore R is absorbed by the absorption layer.
- EUV light applied to the reflective film exposed by removing the absorbing layer is reflected by the reflective film.
- EUV light (exposure light EL) containing circuit pattern information is supplied from the pattern surface of reticle R to projection optical system PO.
- Reticle interferometer 82R detects the position of reticle stage RST (reticle R) in the XY plane To do.
- reticle interferometer 82R is a reticle laser interferometer that projects a laser beam onto a reflective surface provided on or formed on reticle stage RST.
- the reticle laser interferometer always detects the position of the reticle stage RST with a resolution of, for example, about 0.5 to 1 nm.
- the position of reticle R in the Z-axis direction includes an irradiation system 13a that irradiates the detection beam obliquely with respect to the pattern surface, and a light receiving system 13b that receives the detection beam reflected by the pattern surface of reticle R. It is measured by a reticle focus sensor.
- the measurement values of the reticle interferometer 82R and the reticle focus sensor (13a, 13b) are supplied to the main control device 20.
- Main controller 20 activates reticle stage drive unit 34 based on the measurement values of reticle interferometer 82R and reticle focus sensors (13a, 13b) to drive reticle stage RST.
- Main controller 20 controls the position and orientation of reticle R in the six-dimensional direction.
- the projection optical system PO is a reflection optical system that includes only a reflection optical element (mirror).
- the numerical aperture NA of the projection optical system PO is, for example, 0.1.
- the projection magnification of the projection optical system PO is 1 Z4 times, for example. Accordingly, the exposure light EL that is reflected by the reticle R and includes information on the pattern formed on the reticle R is projected onto the wafer W, whereby the pattern on the reticle R is reduced to 1Z4 and transferred to the wafer W. .
- a specific configuration of the projection optical system PO will be described later.
- Wafer stage WST is arranged on wafer stage base 60 arranged in the XY plane, and the wafer stage WST is formed by a magnetic levitation force generated by, for example, a magnetic levitation type two-dimensional linear actuator that constitutes the stage drive unit 62. Supported on stage base 60. Wafer stage drive unit 62 displaces wafer stage WST in the X-axis direction and Y-axis direction with a predetermined stroke (stroke is, for example, 300 to 400 mm), and rotates it in a minute amount in the ⁇ z direction.
- stroke is, for example, 300 to 400 mm
- a wafer holder (not shown) of an electrostatic chuck type is placed on the upper surface of wafer stage WST.
- the wafer holder picks up wafer W.
- Wafer interferometer 82W detects the position of wafer stage WST.
- Wafer interferometer 82W is, for example, a wafer laser interferometer that constantly detects the position of wafer stage WST with a resolution of about 0.5 to: Lnm. Wafers The position of the wafer w can be detected from the position of the stage WST.
- the wafer focus sensor includes an irradiation system 14a that irradiates an upper surface of the wafer W with an oblique force detection beam, and a light receiving system 14b that receives the detection beam reflected by the wafer W surface. Including.
- the irradiation system 14a and the light receiving system 14b are fixed to a column (not shown) that holds the lens barrel of the projection optical system PO.
- the wafer focus sensor (14a, 14b) can be configured in the same manner as the reticle focus sensor (13a, 13b).
- Main controller 20 activates wafer stage drive unit 62 to control the position and orientation of wafer stage WST in the six-dimensional direction.
- wafer stage WST At one end portion of wafer stage WST, the relative position between the projection position on the surface of wafer W of the pattern formed on reticle R and alignment system ALG fixed to lens barrel 52 is measured (, A measuring instrument FM is installed to measure the so-called baseline.
- Reticle stage RST, projection optical system PO, and wafer stage WST are housed in a vacuum chamber (not shown).
- the projection optical system PO has five lens barrels 152a, 152b, 152c, 152d, 152e, and a lens barrel arranged along the Z axis and connected to each other.
- a lens barrel 52 such as a flange FLG cable provided between the tubes 152b and 1 52c is provided.
- mirrors Ml, M2, M3, M4, M5, and M6 are arranged in the lens barrel 52.
- An opening 52a is formed on the side wall of the lens barrel 52, more specifically, on the outer surface of the lens barrel unit 152a and the lens barrel unit 152b, for the exposure light EL to enter.
- the lens barrel units 152a to 152e and the flange FLG are made of a material with little degassing such as stainless steel (SUS).
- the lens barrel unit 152a is a cylindrical member having a rectangular through-hole 52b on the upper wall (+ Z side wall). At the lower end of the barrel unit 152a, an overhanging portion 152f is provided on the outer surface opposite to the opening 52a (one Z side and Y side position).
- the lens barrel unit 152b is a cylindrical member having a slightly larger diameter than the lens barrel unit 152a. It is connected to the lower part (one Z side) of the lens barrel unit 152a. A flange FLG having a diameter larger than that of the other part of the lens barrel 52 is connected to the lower part of the lens barrel unit 152b.
- the lens barrel unit 152c is coupled to the lower part ( ⁇ Z side) of the flange FLG.
- the lens barrel unit 152d is formed of a cylindrical member having a diameter slightly smaller than that of the lens barrel unit 152c, and is connected to the lower portion (one Z side) of the lens barrel unit 152c.
- the lens barrel unit 152e is made of a cylindrical member having a diameter slightly smaller than that of the lens barrel unit 152d, and is connected to the lower portion (one Z side) of the lens barrel unit 152d.
- the lens barrel unit 152e has a bottom surface in which an opening for allowing the exposure light EL to pass from a force projection optical system PO (not shown) toward the weno and W is formed.
- Figs. 3 and 4 With reference to Figs. 3 and 4, the arrangement of the optical elements (mirrors M1 to M6) of the projection optical system PO will be described.
- the six mirrors M1 to M6 are arranged in the order of mirror M2, mirror M4, mirror M3, mirror Ml, mirror M6, and mirror M5 from the top.
- the hatching in Fig. 3 (A) and (B) shows the mirror reflection surface.
- the reflecting surfaces of the mirrors M1 to M6 are formed with high accuracy while alternately repeating the measurement and processing of the optical characteristics so as to satisfy the design values of the optical characteristics.
- the reflecting surfaces of the mirrors M1 to M6 are smooth surfaces including unevenness reduced to about 1/50 to 1/60 or less of the exposure wavelength.
- the RMS value (standard deviation) indicating the surface roughness is 0.2 nm or less, such as 0.2 nm force.
- the mirror Ml is a concave mirror as shown in FIG. 3 (A) and FIG. 4, and its upper surface is a rotationally symmetric reflecting surface such as a spherical surface or an aspherical surface.
- the position of the mirror Ml is adjusted so that the rotational symmetry axis (aspheric surface axis) of the reflecting surface coincides with the optical axis AX of the projection optical system PO.
- the mirror Ml is arranged inside the lens barrel unit 152c and is held by a holding mechanism with 6 degrees of freedom.
- the mirror M2 is a concave mirror, and its lower surface is a rotationally symmetric reflecting surface such as a spherical surface or an aspherical surface.
- the position of the mirror M2 is adjusted so that the rotational symmetry axis (spherical axis or aspherical axis) of the reflecting surface coincides with the optical axis AX of the projection optical system PO.
- the mirror M2 is arranged inside the barrel unit 152a and is held by a holding mechanism with 6 degrees of freedom.
- the mirror M3 is a convex mirror disposed at a position deviating from the optical axis AX of the projection optical system PO. Its upper surface is a reflective surface. As shown in FIG. 4, the reflecting surface of the mirror M3 is a part of a rotationally symmetric surface 94a such as a spherical surface or an aspherical surface indicated by a broken line. The position of L3 is adjusted so that the rotational symmetry axis (spherical axis or aspherical axis) of the surface 94a coincides with the optical axis AX.
- the mirror M3 is arranged inside the lens barrel unit 152b and is held by a holding mechanism with 6 degrees of freedom.
- the mirror M4 is a concave mirror disposed at a position greatly deviated from the optical axis AX of the projection optical system PO, and its lower surface is a reflecting surface.
- the reflecting surface of the mirror M4 is a part of a rotationally symmetric surface 94b such as a spherical surface or an aspherical surface indicated by a broken line.
- the position of the mirror M4 is adjusted so that the rotational symmetry axis (spherical axis or aspherical axis) of the surface 94b coincides with the optical axis AX.
- the mirror M4 is held in the lens barrel unit 152a in FIG. 2 by a holding mechanism with 6 degrees of freedom.
- the mirror M5 is an approximately horseshoe-shaped convex mirror having a notch formed in a part thereof, and its upper surface is a reflecting surface.
- the reflecting surface of the mirror M5 is a part of a rotationally symmetric surface such as a spherical surface or an aspherical surface.
- the position of the mirror M5 is adjusted so that the rotational symmetry axis (spherical axis or aspherical axis) of the reflecting surface coincides with the optical axis AX of the projection optical system PO.
- the cutout of the mirror M5 is formed so as not to block the optical path of the exposure light EL in the portion on the + Y side from the optical axis AX.
- the mirror M5 is held by a holding mechanism with 6 degrees of freedom in the lens barrel unit 152e of FIG.
- the mirror M6 is a substantially horseshoe-shaped concave mirror having a notch formed in a part thereof, and the lower surface thereof is a reflecting surface.
- the reflecting surface of the mirror M6 is a part of a rotationally symmetric surface such as a spherical surface or an aspherical surface.
- the position of the mirror M6 is adjusted so that the rotational symmetry axis (spherical axis or aspherical axis) of the reflecting surface substantially coincides with the optical axis AX of the projection optical system PO!
- the notch of the mirror M6 is formed so as not to block the optical path of the exposure light EL from the portion on the -Y side from the optical axis AX.
- the mirror M6 is held by a holding mechanism with 6 degrees of freedom in the lens barrel unit 152d of FIG.
- the optical axes of the mirrors M1 to M6 coincide with the optical axis AX of the projection optical system.
- Each of the mirrors M2 to M6 has an asymmetric shape with respect to the optical axis of the optical element itself.
- a mirror holding mechanism 92 that holds the mirror M2 will be described with reference to FIGS. other
- the mirror holding mechanism that holds the mirrors M1, M3 to M6 is the same as the mirror holding mechanism 92.
- the mirror holding mechanism 92 holds the mirror M2 within the lens barrel unit 152a.
- the mirror M2 includes an irregular polygonal (hexagonal) body portion M2a and a cutout portion M2b formed to secure an optical path in a part of the body portion M2a. .
- the mirror holding mechanism 92 includes mirror holding members 44A, 44B, 44C that hold the mirror M2 and fix it to the inner ring 42, and a parallel link mechanism 41 that displaces the inner ring 42.
- the mirror holding members 44A, 44B, and 44C are disposed on the lower surface of the inner ring 42 and hold predetermined three locations on the outer peripheral surface of the mirror M2.
- the mirror holding members 44A to 44C respectively hold three portions on the outer peripheral surface of the mirror M2, for example, three equally divided points on the outer periphery at intervals of 120 ° of the central angle.
- Each mirror holding member 44A to 44C has a substantially U-shape, and this shape is set so that the rigidity of each mirror holding member 44A to 44C in the radial direction of the inner ring 42 is reduced! RU
- Each mirror holding member 44A to 44C includes a mechanical clamping mechanism that clamps a flange portion (not shown) provided on the outer periphery of the mirror M2. The positional relationship between the mirror M2 and the inner ring 42 is maintained by the clamp mechanism.
- the trisection point on the outer periphery of the mirror M2 is in the radial direction of the inner ring 42, and the rigidity is low! ⁇ Since it is held by the mirror holding members 44A to 44C, the mirror M2 is thermally expanded. Even if this occurs, the mirror M2 thermally expands almost uniformly in various directions in the XY plane. Therefore, the contour shape of the mirror M2 after the thermal expansion is maintained to be similar to the original mirror M2.
- the parallel link mechanism 41 is a parallel link mechanism having six degrees of freedom called a Stewart platform type including six extendable links 110.
- the parallel link mechanism 41 includes an outer ring 48 as a base disposed on the inner surface of the lens barrel unit 152a, a drive mechanism 46 fixed to the outer ring 48, and an end effector that is displaced by the drive mechanism 46. It is comprised from the inner ring 42 which comprises.
- the outer ring 48 is an annular member provided on an annular projecting portion projecting inward at the upper end portion of the lens barrel unit 152a via three adjustment washers (not shown).
- the inner ring 42 is an annular member whose diameter is slightly smaller than that of the outer ring 48. It is arranged below.
- the drive mechanism 46 connects the outer ring 48 and the inner ring 42 to each other, and drives the inner ring 42 in the direction of 6 degrees of freedom with respect to the outer ring 48.
- the drive mechanism 46 includes six links 110 having one end and the other end connected to the outer ring 48 and the inner ring 42 through spherical pairs, respectively.
- each link 110 includes a first shaft member 113 and a second shaft member 115 connected to or coupled to the first shaft member 113.
- One end (upper end) of the first shaft member 113 is attached to the outer ring 48 via the ball joint 111.
- the other end (lower end) of the second shaft member 115 is attached to the inner ring 42 via the ball joint 112 so as to form a spherical pair.
- Three sets of drive mechanisms 46A, 46B, 46C are constituted by a set of two links 110, and these three drive mechanisms 46A, 46B, 46C are arranged at equiangular intervals of 120 °.
- Each drive mechanism 46A, 46B, 46C [Shortly, the distance between the outer ring 48 rule Bonore joint 111 [The distance between the ball joint 112 on the inner ring 42 side is relatively small.
- each link 110 at least one of the second shaft member 115 and the first shaft member 113 has a length of the link 110, that is, a distance between the upper end of the first shaft member 113 and the lower end of the second shaft member 115.
- An actuator for changing the separation is provided.
- Examples of the actuator are a direct acting cylinder, a solenoid, a small linear motor, or a piezoelectric element.
- a piezoelectric element is used.
- the actuator is controlled by a drive circuit (not shown). With this drive circuit, the six actuators are controlled without stress, and the inner ring 42 is controlled to a predetermined posture with six degrees of freedom.
- the configuration of the mirror holding mechanism for the mirrors Ml and M3 to M6 is almost the same as that of the mirror holding mechanism 92 for the mirror M2.
- the location, shape, direction, and optical path position of the mirrors M1 to M6 may be changed as appropriate.
- the mirror holding mechanism 92 of the mirror M2 is not limited to the examples of FIGS.
- the inner ring 42 is arranged on the back side of the reflecting surface (+ Z direction, upper side in FIG. 5).
- the outer ring 48 may be arranged on the lower end periphery of the lens barrel unit 152a, the link mechanisms may be arranged above the outer ring 48, and the inner ring 42 may be arranged above the link mechanism.
- the mirror M2 may be disposed above the inner ring 42 instead of the lower end of the inner ring 42.
- the inner ring 42 and the outer ring 48 need to have an annular shape along the lens barrel 52. There is no. If the mechanical conditions described later are satisfied, the inner ring 42 and the outer ring 48 are in accordance with conditions such as an elliptical shape or a half moon shape that is biased to one side so as not to interfere with the optical path, or a shape having a notch. The shape may be different.
- the links 110 do not have to be arranged at equiangular intervals of 120 ° with respect to the centers of the inner ring 42 and the outer ring 48.
- EUVL requires an optical device that stably holds an optical element.
- the use of EUV light affects the accuracy of EUVL due to minute vibrations that were not likely to be a problem in the past.
- the inventor of the present application has developed an optical device designed with emphasis on the mechanical conditions of the optical device, rather than the conventional design focusing only on optical performance and productivity.
- the mechanical configuration of the optical device according to the first to twelfth embodiments of the present invention will be described.
- FIG. 7 is a simplified schematic diagram of the mirror holding mechanism 92 shown in FIG. 6, and FIG. 8 is a perspective view of FIG.
- the three pairs of links 110 shown in FIGS. 7 and 8 are expressed as three support members LA, LB, and LC.
- the two ball joints 112 included in each of the drive mechanisms 46A, 46B, and 46C are approximated to be at the intersection of the two links 110, and are expressed as one support position PI, P2, and P3.
- one support member includes a set of links 110 included in each of the drive mechanisms 46A, 46B, 46C of the first embodiment, and one support position is an optical that is supported by the one set of links 110. Including the position on the element.
- a ball joint 111 which is a connection point between the pair of links 110 and the outer ring 48, is simplified as ball joints BJD, BJE, and BJF.
- the mirror M2, the inner ring 42, and the mirror holding member 44 form an optical unit.
- the academic unit can be considered as one rigid body.
- the optical unit is called a virtual rigid body M.
- the dynamic center of mass (center of gravity) CM of the virtual rigid body M is illustrated.
- a triangle with the three support positions PI, P2, and P3 as vertices is defined as “reference triangle DT”.
- the circumscribed circle of the reference triangle is defined as “reference circle DC”.
- the plane including the three support positions PI, P2, and P3 is defined as “reference plane DP”.
- the geometric center CI of the reference triangle DT which is the intersection of the bisectors of the three corners, and points that are equidistant from the three sides are indicated by double circles.
- the optical device supports optical elements (M2 to M6) that are asymmetric with respect to the optical axis of the optical device, optical element holding members (42, 44) that hold the optical elements, and optical element holding members And at least three support members (LA, LB, LC).
- At least one of the optical element holding member and the optical element is configured such that the weight of the virtual rigid body M is substantially evenly applied to the support members LA, LB, LC, that is, the support positions PI, P2, P3.
- the load of the virtual rigid body M is calculated considering the vertical gravity and the rotational moment of the virtual rigid body M.
- the load of the virtual rigid body M is calculated by a method according to indefinite mechanics.
- the relative positions of the support positions PI, P2, and P3 and the mass center CM of the virtual rigid body M are determined so that the loads acting on the support positions PI, P2, and P3 are equal to each other.
- the mass of the virtual rigid body M with respect to the support positions PI, P2, and P3 is moved by moving one or both of the elements constituting the virtual rigid body M, that is, the optical element holding member and the optical element.
- the optical element holding member and the optical element Optimize the position of the central CM.
- light The optical holding member (inner ring 42 and mirror holding member 44) and the optical element (mirror M2) are moved relative to each other by the link 110.
- the moving element is a combination of only “mirror M2", “mirror M2 + mirror holding member 44", or “mirror M2 + mirror holding member 44 + inner ring 42".
- To move only the mirror M2 if there is a gap between the flange portion of the mirror M2 and the mirror holding member 44, the holding position of the mirror M2 by the mirror holding member 44 is changed. If there is no gap between the flange part of the mirror M2 and the mirror holding member 44, the shape of the flange part of the mirror M2 is changed.
- the center of mass CM of the virtual rigid body M is displaced basically by changing only the position of the component.
- the positions of the support positions PI, P2, and P3 are optimized according to the position of the center of mass CM of the elements constituting the virtual rigid body M.
- the support positions PI, P2, and P3 are not arranged at regular intervals.
- the position, orientation and shape of the optical element are strictly designed according to the conditions required for the projection optical system PO.
- the optical conditions such as the position of the reflecting surface of the main body M2a 'posture, the position of the notch M2b, and the position of the inner ring 42 are determined.
- the third method in order to determine the position of the center of mass CM of the virtual rigid body M, at least one of the optical element holding member and the optical element without moving the optical element holding member and / or the optical element is used.
- the center of mass of the virtual rigid body M is moved by providing a balance weight.
- the protrusion M2c is formed on the back surface (opposite surface of the reflecting surface, + Z side) of the substantially hexagonal main body M2a.
- the protrusion M2c functions as a balance weight having a positive weight.
- the non-weight M2c is an unnecessary part that does not contribute to optical and production efficiency requirements.
- Mirror on M2 When the back surface is formed flat, the mirror M2 does not have a rotationally symmetric shape due to the presence of the notch M2b, and the center of mass of the mirror M2 is notched with respect to the optical axis AX in FIG.
- the balance weight M2c is integrally provided in the vicinity of the notch M2b on the back surface of the mirror M2.
- the balance weight M2c may be provided at a position other than the back surface of the mirror M2. For example, it can be provided on a flange portion (not shown) of the mirror M2 held by the mirror holding member 44. If the optical path is not obstructed, the balance weight M2c can be provided at any position of the mirror M2 excluding the reflecting surface.
- the balance weight BW may be a separate member attached to the force inner ring 42 that may be provided integrally with the inner ring 42.
- the first and second methods can be implemented without making major changes to each member.
- the third method can be implemented without changing the original optical design, and when the balance weight M2c is integrated with the mirror M2, which is an optical element, the mass is close to the center of mass M2d. The rotational moment around M2d becomes smaller. Further, since no adhesive is used, it does not become a gas generation source that prevents purging.
- the balance ring BW is provided on the inner ring 42, the processing is easy. In particular, when it is formed of a separate member, it is easy to adjust the mass and position, and adjustment is possible even after the optical device is assembled.
- balance weight BW is a part with a positive mass like a protrusion. "Minute” and “portions with negative mass” such as recesses and notches. The provision of the lance weight BW is to add a “part having a positive mass” to the original configuration and to partially delete the original configuration, that is, to form a recess or a notch. Including.
- At least one of the optical element holding member and the optical element is configured such that the mass of the virtual rigid body M is evenly applied to the three support members LA, LB, and LC. Since the relative position between the center of mass CM of the virtual rigid body M and the support positions PI, P2, and P3 is adjusted, the weight balance of the optical device is improved and it is possible to prevent the load from acting on a specific support member. As a result, the rotational moment of the virtual rigid body M is reduced, and the static stability and dynamic stability of the optical device are improved.
- the support members LA, LB, and LC are dynamic actuators, but may be static support members.
- At least one of the optical element holding member and the optical element is such that the mass center CM of the virtual rigid body M supports at least three support members LA, LB, LC that support the optical element holding member. It is configured to be within a predetermined distance d from the inner center CI of the reference triangle DT formed with the positions PI, P2, and P3 as vertices.
- the reason why the “inner center CI of the reference triangle DT” was used as a reference is that the inner center CI has the smallest momentum during the movement of the reference triangle DT. This will be explained.
- the six degrees of freedom are X, Y, displacement along the ⁇ axis, and rotation around the X, ⁇ , ⁇ axis. Of the six degrees of freedom, consider the displacement in the ⁇ axis direction and the rotation around the X axis and ⁇ axis, which require the most alignment adjustment.
- the weight of the virtual rigid body ⁇ is equally applied to the support positions PI, ⁇ 2, and ⁇ 3.
- the center of mass CM of the virtual rigid body ⁇ be in the vertical direction of the reference triangle DT.
- the center of mass CM of the virtual rigid body M is in the vertical direction of the inner center CI of the reference triangle DT.
- tilting of the optical element that is, rotation ⁇ ⁇ , ⁇ y is considered.
- the supporting members LA, LB, and LC tilt the virtual rigid body M, that is, the optical element, by displacing the supporting positions PI, P2, and P3 in the Z-axis direction. Displace one of the supporting members LA, LB, LC in the Z direction. Then, one of the support positions PI, P2, P3 moves around a straight line connecting the other two support positions, and the optical element tilts.
- Optical axis of projection optical system In the case of an optical element at a position far away from AX, for example, in the case of mirror M3 or mirror M4 (see Fig. 3), the optical axis of the optical element (optical axis of the optical system) If the axis of rotation is on AX), the calculation to control the tilt of the optical element is simple. The force optical element is far from the optical axis AX, so a large displacement is required to tilt the optical element. Become. In the telescopic type parallel mechanism equipped with an actuator using piezoelectric elements, the stroke force S of each actuator is small, so that one or two actuators can be extended and the remaining actuators can contract. Necessary for a large tilt. Therefore, if the rotation axis of the rotational movement of the optical element is within the reference triangle DT composed of the three support positions PI, P2, and P3, the optical element can be efficiently rotated.
- the displacement of the virtual rigid body M in the X-axis direction, the displacement in the Y-axis direction, or the rotation around the Z-axis means that the displacement in the XY plane of the support positions PI, P2, P3 is a horizontal movement. For this reason, it is desirable that the center of mass CM of the virtual rigid body M be placed on the plane containing the reference triangle DT.
- the distance d between the center of mass CM and the inner center CI is smaller than a predetermined value determined by the rotational moment of the virtual rigid body M, the rigidity of the support member, the allowable vibration, and the like.
- the first method of moving the optical element and the optical element holding member in order to make the distance d between the center of mass CM and the inner center CI smaller than the predetermined value, and the second method of moving the center of mass CM by the balance weight Can be used.
- the center of motion of the virtual rigid body M approaches the mass center CM of the virtual rigid body M. Therefore, the rotational moment of the virtual rigid body M accompanying the adjustment of the optical element is reduced, and the optical device The dynamic stability of is improved.
- the center of mass most preferable as the center point of the rotational motion CM force Since it coincides with the inner center CI of the reference triangle DT that is the center of the actual motion, the dynamic stability is most improved. In addition, unnecessary vibration moments are generated by external vibrations.
- the third embodiment is the most desired form.
- the intersection point PI coincides with the inner center CI of the reference triangle DT.
- the weight force applied to the support positions PI, P2, P3 is the same in the 3 ⁇ 4 axis direction, and the load applied to the support positions PI, P2, P3 is substantially uniform. Improves.
- the distance e between the intersection point PI and the inner center CI of the reference triangle DT is smaller than the predetermined distance r.
- the weight applied perpendicularly to each support position PI, P2, P3 is not necessarily the same in the vertical direction (Z-axis direction of the first embodiment).
- the moment of inertia of the rotation ⁇ z around the Z axis is reduced.
- the moment of inertia of the rotations ⁇ ⁇ and ⁇ y around the X and ⁇ axes is less likely to cause a difference in weight applied perpendicular to the support positions PI, P2, and P3. Therefore, the static stability and dynamic stability of the optical device are improved.
- the intersection point PI is arranged in the reference plane DP.
- the intersection point PI may be inside or outside the reference triangle DT.
- the center of mass of the virtual rigid body M CM force is positioned above the reference plane DP of the reference triangle DT formed with the support positions PI, P2, P3 of the support members LA, LB, LC as vertices It is structured as follows. That is, the intersection point PI is located inside the reference triangle DT. In addition, the distance e between the intersection point PI and the inner center CI is set smaller than a predetermined distance.
- the center of mass CM of the virtual rigid body M is the height h of the center of mass CM from the intersection point PI of the perpendicular line dropped to the reference plane DP, that is, the reference plane DP and the center of mass CM.
- Distance force between and smaller than the predetermined value In this configuration, the distance between the reference plane DP including the center of motion and the center of mass CM is close, and static stability and dynamic stability are improved. In particular, the smaller the height h, the better the stability against displacement in the X-axis and ⁇ -axis directions.
- At least one of the optical element holding member and the optical element of the ninth embodiment has at least one force of the inertia main axes PA, PA, PA of the virtual rigid body M.
- It is configured to extend in parallel with the reference plane DP including the support positions PI, P2, P3.
- Inertial principal axis is the principal axis of the inertia ellipsoid.
- a homogeneous object has three principal axes of inertia that are orthogonal to each other.
- An “inertia ellipsoid” is a quadric surface that represents the shape of an inertia tensor of a rigid body or mass system. When the moment of inertia is 1, 1, 1, and the product of inertia is I, 1, 1, 1, 1, the inertia ellipse
- the virtual rigid body M is in a state similar to the static imbalance (JIS B 0123) of the rotating machine, and at least the virtual rigid body M parallel to the inertial principal axis PA.
- the movement is unbalanced in only one direction and is relatively stable.
- optical device will be described with reference to FIG.
- at least one of the optical element holding member and the optical element is positioned on at least one of inertial principal axes PA, PA, and PA of the virtual rigid body M, for example, the inertial principal axis PA force on the reference plane DP.
- the virtual rigid body M is often rotated around a rotation axis close to the XY plane.
- At least one of the optical element holding member and the optical element is at least one of inertial principal axes PA, PA, PA of the virtual rigid body M, for example, inertial principal axis PA 1S support position PI,
- It is configured to intersect with the reference triangle DT within the reference triangle DT formed with P2 and P3 as vertices.
- the optical device according to the twelfth embodiment will be described.
- all of the principal axes of inertia PA, PA and PA are connected to the reference triangle DT within the reference triangle DT.
- optical devices according to the first to twelfth embodiments can be applied to the lens barrel units 152a to 152e.
- the projection optical system PO with good static stability and dynamic stability can be obtained.
- the parallel link mechanism 41 of the present embodiment is limited to this configuration that drives the mirror held by the mirror holding members 44A, 44B, 44C by displacing the inner ring 42. Is not to be done.
- the inner ring 42 may be omitted, and the drive mechanism 46A, 46B, 46C of the normal link mechanism 41 may support the mirror holding members 44A, 44B, 44C, respectively, to drive the mirror.
- the projection optical system PO equipped with the optical apparatus of the present invention is used in the lithographic process for manufacturing a device, EUV light having an extremely short wavelength is reflected by the reflective projection optical system, and therefore it is affected by chromatic aberration.
- the fine pattern of reticle R can be transferred to each shot area on wafer W with high accuracy. Specifically, it is possible to transfer a fine pattern with a minimum line width of about 70 nm with high accuracy.
- the present invention is not limited to a reflective projection optical system that uses EUV light as exposure light and includes six reflective optical elements (mirrors M1 to M6).
- the number of optical elements may be other than six.
- the exposure light is VUV light with a wavelength of 100 to 160 nm, such as Ar laser (wavelength 126 nm).
- the present invention can also be suitably applied to a catadioptric projection optical system that includes a lens and a reflective optical element.
- the present invention has a remarkable effect in holding a non-rotationally symmetric optical element.
- the performance of the optical device is improved. Therefore, the present invention shows the most remarkable effect in the catoptric projection optical system.
- the present invention can be applied to the catadioptric projection optical system and the catadioptric projection optical system in which the rotationally symmetric lens is configured coaxially. It produces a sufficient effect.
- the optical apparatus may be a projection exposure apparatus that uses EUV light having a wavelength of 13 nm as exposure light.
- each mirror needs to be provided with a multilayer reflective film in which molybdenum Mo and silicon Si are alternately laminated.
- the exposure light source is not limited to a laser-excited plasma light source, and an SOR, a betatron light source, a discharge light source, an X-ray laser, or the like can be used.
- the optical apparatus included in the projection optical system constituting the exposure apparatus has been described, but the present invention may be an optical apparatus included in the illumination optical system.
- the optical apparatus of the present invention can be employed in apparatuses other than an exposure apparatus having an optical element in a lens barrel, and the same effects as those of the embodiments can be obtained.
- the present invention can be implemented with a remarkable effect even if it is an optical device that does not have a lens barrel, for example, holds an optical element of a single mirror.
- the parallel link mechanism of the first embodiment is a Stewart platform type in which an extendable actuator is provided between joints.
- the ball joint 112 that connects a pair of links 110 on the inner ring 42 side constituting the end effector is close to the ball joint 111 on the outer ring 48 side that constitutes the base, and is widely separated.
- the inner ring 42 side may be widely separated and the outer ring 48 side may be close.
- the ball joints 112 on the inner ring 42 side constituting the virtual rigid body M are distributed in six locations. Force Even if two pairs of parallel links are separated, this pair of two parallel links
- the link corresponds to one support member of the present invention, and the reference triangle DT is defined with the intermediate points of the two ball joints 112 as the support positions P1, P2, P3.
- the inner ring 42 is supported by the link 110, which is a support member, at six support positions.
- the reference triangle DT may be defined by selecting one of the links 110 in a set of two links 110.
- a fixed linear motion actuator is used, and a linear motion type link mechanism that moves on a straight line where the base side joint is fixed, or a fixed rotary type actuator. It is possible to use a rotary (bending) link mechanism in which the base joint rotates.
- the optical element may be movably supported by a configuration other than the normal link mechanism 41.
- the movement of the optical element may be other than 6 degrees of freedom.
- the present invention can be applied to any mechanism that supports the optical element and the optical element holding member with at least three support members so as to be integrally movable with one or more degrees of freedom.
- FIG. 20 is a schematic diagram of an optical device that supports the mirror M3.
- the support positions PI, P2, P3 of the support members LA, LB, LC are arranged at equiangular intervals of approximately 120 ° in the annular inner ring 42.
- the optical element (mirror M3) is arranged around the inside of the lens barrel 52, and the inner ring 142 and the outer ring 148 are also irregularly shaped to avoid the optical path.
- the mirror holding members 144A to 144C that hold the mirror M3 are also not arranged at equiangular intervals. Even with such a configuration, the methods described in the eleventh to twelfth embodiments can be applied.
- the relationship of the virtual rigid body M with the center of mass CM is not limited to the inner center CI, but can be set based on the intersection of the optical axis AX and the reference plane DP, the outer center of the reference triangle DT, and the center of gravity.
- the control calculation is simpler if the calculation is based on the intersection with the optical axis AX.
- This action requires a large stroke for the actuator. If the stroke is sufficient, it is possible to use the intersection with the optical axis AX as a reference, but in this configuration, the stroke of the actuator is particularly small in piezo elements, so the reference is the inner center CI. It is reasonable.
- the relationship with the mass center CM of the virtual rigid body M can be set based on the center of gravity of the reference triangle DT. Which configuration is adopted depends on the conditions required for the optical element.
- an optical device such as the mirror holding mechanism 92 is arranged in parallel. Since the link mechanism 41 is provided, not only the static stability of the mirrors M1 to M6, which are optical elements, but also the dynamic stability is improved.
- the exposure apparatus 10 including the lens barrel 52 equipped with the optical apparatus of the present invention it is possible to produce a semiconductor device with a high accuracy with a small accuracy drop due to vibration and a high accuracy.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
- Public Health (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Epidemiology (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- Mounting And Adjusting Of Optical Elements (AREA)
- Eyeglasses (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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KR1020077004007A KR101249598B1 (ko) | 2004-10-26 | 2005-10-24 | 광학 장치, 경통, 노광 장치, 및 디바이스의 제조 방법 |
US11/666,166 US7692884B2 (en) | 2004-10-26 | 2005-10-24 | Optical apparatus, barrel, exposure apparatus, and production method for device |
AT05795711T ATE538404T1 (de) | 2004-10-26 | 2005-10-24 | Optisches system, objektivtubus; belichtungssystem und bauelemente- herstellungsverfahren |
JP2006543129A JP4893310B2 (ja) | 2004-10-26 | 2005-10-24 | 光学装置、鏡筒、露光装置、及びデバイスの製造方法 |
EP05795711A EP1806610B1 (en) | 2004-10-26 | 2005-10-24 | Optical system, lens barrel, exposure system, and production method for a device |
Applications Claiming Priority (2)
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JP2004311482 | 2004-10-26 | ||
JP2004-311482 | 2004-10-26 |
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WO2006046507A1 true WO2006046507A1 (ja) | 2006-05-04 |
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PCT/JP2005/019495 WO2006046507A1 (ja) | 2004-10-26 | 2005-10-24 | 光学装置、鏡筒、露光装置、及びデバイスの製造方法 |
Country Status (8)
Country | Link |
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US (1) | US7692884B2 (ja) |
EP (1) | EP1806610B1 (ja) |
JP (1) | JP4893310B2 (ja) |
KR (1) | KR101249598B1 (ja) |
CN (1) | CN101048690A (ja) |
AT (1) | ATE538404T1 (ja) |
TW (1) | TWI409516B (ja) |
WO (1) | WO2006046507A1 (ja) |
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JP2015503234A (ja) * | 2011-12-27 | 2015-01-29 | エーエスエムエル ネザーランズ ビー.ブイ. | リソグラフィ装置及びデバイス製造方法 |
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- 2005-10-24 EP EP05795711A patent/EP1806610B1/en active Active
- 2005-10-24 KR KR1020077004007A patent/KR101249598B1/ko active IP Right Grant
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US8967817B2 (en) | 2001-05-25 | 2015-03-03 | Carl Zeiss Smt Gmbh | Imaging optical system with at most 11.6% of the illuminated surfaces of the pupil plane being obscured |
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US9448384B2 (en) | 2010-12-20 | 2016-09-20 | Carl Zeiss Smt Gmbh | Arrangement for mounting an optical element |
JP2015503234A (ja) * | 2011-12-27 | 2015-01-29 | エーエスエムエル ネザーランズ ビー.ブイ. | リソグラフィ装置及びデバイス製造方法 |
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Also Published As
Publication number | Publication date |
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TWI409516B (zh) | 2013-09-21 |
US7692884B2 (en) | 2010-04-06 |
JPWO2006046507A1 (ja) | 2008-05-22 |
ATE538404T1 (de) | 2012-01-15 |
EP1806610A4 (en) | 2010-09-29 |
KR101249598B1 (ko) | 2013-04-01 |
US20080055756A1 (en) | 2008-03-06 |
JP4893310B2 (ja) | 2012-03-07 |
EP1806610B1 (en) | 2011-12-21 |
KR20070063503A (ko) | 2007-06-19 |
CN101048690A (zh) | 2007-10-03 |
EP1806610A1 (en) | 2007-07-11 |
TW200630659A (en) | 2006-09-01 |
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