WO2018066338A1 - パターン描画装置 - Google Patents
パターン描画装置 Download PDFInfo
- Publication number
- WO2018066338A1 WO2018066338A1 PCT/JP2017/033352 JP2017033352W WO2018066338A1 WO 2018066338 A1 WO2018066338 A1 WO 2018066338A1 JP 2017033352 W JP2017033352 W JP 2017033352W WO 2018066338 A1 WO2018066338 A1 WO 2018066338A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pattern
- intensity
- substrate
- light source
- source device
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
- G02B26/127—Adaptive control of the scanning light beam, e.g. using the feedback from one or more detectors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
- G03F7/2053—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using a laser
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
- G03F7/2057—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using an addressed light valve, e.g. a liquid crystal device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
Definitions
- the present invention relates to a pattern drawing apparatus that draws a predetermined pattern on a substrate by scanning a beam spot on the substrate as an irradiation object.
- a spot light of a laser beam is projected onto an object to be irradiated (processing object), and the spot light is main-scanned in a one-dimensional direction by a scanning mirror (polygon mirror), and the object to be irradiated is set in the main scanning line direction.
- a scanning mirror polygon mirror
- the object to be irradiated is set in the main scanning line direction.
- an image forming apparatus drawing apparatus as disclosed in Japanese Patent Application Laid-Open No. 2008-195019
- Japanese Patent Application Laid-Open No. 2008-195019 discloses that a plurality of scanning areas (sharing areas) set on a photosensitive material, which is a photographic printing paper, are scanned by sharing with an exposure beam from a laser exposure unit.
- a plurality of scanning areas (sharing areas) set on a photosensitive material which is a photographic printing paper
- a laser exposure unit When forming (drawing) an image on a laser beam, the relationship between the predetermined change in the temperature of the laser exposure unit and the change in the intensity of the exposure beam so that the exposure amount due to the exposure beam does not fluctuate due to the temperature change of the plurality of laser exposure units
- the intensity of the exposure beam from the laser exposure unit is adjusted to suppress the density unevenness at the joints of the scanning regions that each laser exposure unit is responsible for.
- the temperature of the laser light source and the AOM is controlled by the temperature control unit.
- the exposure amount changes when the temperature changes by 0.1 ° C. or more with respect to the set temperature.
- the modulation level of the AOM that modulates the laser light according to the image data is corrected according to the temperature change measured by the temperature sensor. That is, in Japanese Patent Application Laid-Open No.
- Variations in the exposure amount at the laser exposure unit are corrected by adjusting the modulation level of the AOM, thereby suppressing density unevenness due to discontinuous exposure amount differences at the boundaries of the shared areas on the photosensitive material.
- a first aspect of the present invention is a pattern drawing apparatus that draws a pattern on the substrate by a plurality of drawing units that draw a pattern by scanning a beam from a light source device on the substrate by a scanning member,
- the beam from the light source device is arranged to pass in order, and the beam is drawn by electrical control.
- the specific drawing unit when adjusting the intensity of the beam projected to the substrate from a specific drawing unit of the plurality of drawing units, and a beam switching unit having a plurality of selection optical members directed to the unit
- the beam intensity projected onto the substrate is adjusted within the adjustable range of the beam intensity adjustment unit, and other drawing units other than the specific drawing unit are adjusted.
- the beam intensity adjusting unit corresponding to each of the other drawing units so that the intensity of the beam projected onto the substrate from each of the optical plots is aligned with the intensity of the beam projected onto the substrate from the specific drawing unit.
- a control unit for controlling.
- a second aspect of the present invention is a pattern drawing apparatus that draws a pattern on the substrate by a plurality of drawing units that draw a pattern by scanning a beam from a light source device on the substrate by a scanning member, In order to selectively supply a beam from the light source device to any one of the plurality of drawing units, the beam from the light source device is arranged to pass in order, and the beam is drawn by electrical control.
- a beam switching unit having a plurality of selection optical members directed to the unit, and a plurality of beams provided corresponding to each of the plurality of drawing units and capable of adjusting the intensity of the beam projected on the substrate within a predetermined range
- the intensity adjustment unit is selected by the selection optical member that finally enters the beam from the light source device, and the drawing unit is selected.
- the plurality of beam intensity adjustments so that the intensities of the beams projected onto the substrate from each of the plurality of drawing units are made uniform based on an adjustable range of the intensity of the beam projected onto the substrate via the network.
- a control unit for controlling the unit.
- a third aspect of the present invention is a pattern drawing apparatus that draws a pattern on the substrate by a plurality of drawing units that draw a pattern by scanning a beam from the light source device on the substrate with a scanning member, the light source
- An electrooptic selection optical member for deflecting a beam from the apparatus toward the drawing unit is provided corresponding to each of the plurality of drawing units, and a plurality of the beams from the light source device are used for the selection.
- a beam switching unit having a plurality of optical elements for guiding light so as to pass through each of the optical members in order, and selectively supplying a beam from the light source device to one of the plurality of drawing units,
- a switching control unit that applies a drive signal for deflection to one of the plurality of selection optical members; and the selection optical that is provided with the drive signal of the plurality of selection optical members. It detects the intensity of the beam undeflected state that has passed through the timber, and a beam intensity measuring unit for measuring the intensity of the beam, each supplied to the plurality of rendering units.
- a pattern drawing device for drawing a pattern on the substrate by a plurality of drawing units for drawing a pattern by scanning a beam from the light source device on the substrate with a scanning member.
- Acousto-optic modulation elements for deflecting the beam from the apparatus toward the drawing unit are provided corresponding to each of the plurality of drawing units, and the beam from the light source apparatus is provided to each of the plurality of acousto-optic modulation elements.
- a plurality of acoustooptics so as to sequentially supply a beam from the light source device to one of the plurality of drawing units.
- a control unit that switches one of the modulation elements to a deflection state, and non-deflection that has passed through the acoustooptic modulation element that is in a deflection state among the plurality of acoustooptic modulation elements It detects the intensity of the beam of state, and a beam intensity measuring unit for measuring the intensity of the beam, each supplied to the plurality of rendering units.
- FIG. 1 is a perspective view showing a schematic overall configuration of a pattern drawing apparatus according to a first embodiment. It is a perspective view which shows the specific structure of the drawing unit mounted in the pattern drawing apparatus shown in FIG. It is a figure which shows the specific optical arrangement
- FIG. 5 is a diagram for explaining a connection relationship between an intensity adjustment control unit, a drive circuit, and the like provided in the drawing control apparatus shown in FIG. 4.
- FIG. 1 is a perspective view showing a schematic configuration of a pattern drawing apparatus (hereinafter also referred to as an exposure apparatus) EX that performs an exposure process on a substrate (object to be irradiated) P according to the first embodiment.
- an XYZ orthogonal coordinate system in which the gravity direction is the Z direction is set, and the X direction, the Y direction, and the Z direction will be described according to the arrows shown in the drawing.
- the pattern drawing apparatus EX is a substrate processing apparatus used in a device manufacturing system for manufacturing an electronic device by performing predetermined processing (such as exposure processing) on the substrate P.
- the device manufacturing system is a manufacturing system in which a manufacturing line for manufacturing, for example, a flexible display as an electronic device, a film-like touch panel, a film-like color filter for a liquid crystal display panel, flexible wiring, or a flexible sensor is constructed. System. The following description is based on the assumption that a flexible display is used as the electronic device. Examples of the flexible display include an organic EL display and a liquid crystal display.
- a substrate P is sent from a supply roll (not shown) in which a flexible sheet-like substrate (sheet substrate) P is wound in a roll shape, and various processes are continuously performed on the sent substrate P.
- the substrate P after various treatments is wound up by a collection roll (not shown), which is a so-called roll-to-roll production method. Therefore, the substrate P after various types of processing is a multi-sided substrate in which a plurality of devices (display panels) are arranged in a state where they are connected in the transport direction of the substrate P.
- the substrate P sent from the supply roll is sequentially subjected to various processes through the process device in the previous process, the pattern drawing apparatus EX, and the process apparatus in the subsequent process, and is taken up by the collection roll.
- the substrate P has a belt-like shape in which the moving direction (transport direction) of the substrate P is the longitudinal direction (long direction) and the width direction is the short direction (short direction).
- a resin film or a foil (foil) made of metal or alloy such as stainless steel is used.
- the material of the resin film include polyethylene resin, polypropylene resin, polyester resin, ethylene vinyl copolymer resin, polyvinyl chloride resin, cellulose resin, polyamide resin, polyimide resin, polycarbonate resin, polystyrene resin, and vinyl acetate resin. Among them, one containing at least one or more may be used.
- the thickness and rigidity (Young's modulus) of the substrate P are within a range in which a fold due to buckling or irreversible wrinkles does not occur in the substrate P when passing through the conveyance path of the device manufacturing system or the pattern drawing apparatus EX. If it is.
- a film such as PET (polyethylene terephthalate) or PEN (polyethylene naphthalate) having a thickness of about 25 ⁇ m to 200 ⁇ m is typical of a suitable sheet substrate.
- the substrate P may receive heat in each process performed in the device manufacturing system, it is preferable to select the substrate P made of a material whose thermal expansion coefficient is not significantly large.
- the thermal expansion coefficient can be suppressed by mixing an inorganic filler with a resin film.
- the inorganic filler may be, for example, titanium oxide, zinc oxide, alumina, or silicon oxide.
- the substrate P may be a single layer of ultrathin glass having a thickness of about 100 ⁇ m manufactured by a float process or the like, or a laminate in which the above resin film, foil, etc. are bonded to the ultrathin glass. It may be.
- the flexibility of the substrate P means the property that the substrate P can be bent without being sheared or broken even when a force of its own weight is applied to the substrate P. .
- flexibility includes a property of bending by a force of about its own weight.
- the degree of flexibility varies depending on the material, size, and thickness of the substrate P, the layer structure formed on the substrate P, the environment such as temperature or humidity, and the like. In any case, when the substrate P is correctly wound around various conveyance rollers, rotary drums, or other members for conveyance direction provided in the conveyance path in the device manufacturing system (pattern drawing apparatus EX), the substrate P buckles and folds. If the substrate P can be smoothly transported without being damaged or broken (breaking or cracking), it can be said to be in the range of flexibility.
- the process device in the previous process transports the substrate P sent from the supply roll along the longitudinal direction at a predetermined speed toward the pattern drawing device EX. Meanwhile, the previous process is performed on the substrate P to be sent to the pattern drawing apparatus EX.
- the substrate P sent to the pattern writing apparatus EX by this pre-process is a substrate (photosensitive substrate) having a photosensitive functional layer (photosensitive layer) formed on the surface thereof.
- This photosensitive functional layer is applied as a solution on the substrate P and dried to form a layer (film).
- a typical photosensitive functional layer is a photoresist (in liquid or dry film form), but as a material that does not require development processing, the photosensitivity of the part that has been irradiated with ultraviolet rays is modified.
- SAM silane coupling agent
- a photosensitive reducing agent When a photosensitive silane coupling agent is used as the photosensitive functional layer, the pattern portion exposed to ultraviolet rays on the substrate P is modified from lyophobic to lyophilic.
- a thin film transistor (TFT) or the like can be formed by selectively applying a conductive ink (ink containing conductive nanoparticles such as silver or copper) or a liquid containing a semiconductor material on the lyophilic portion.
- a pattern layer to be an electrode, a semiconductor, insulation, or a wiring for connection can be formed.
- the plating reducing group is exposed to the pattern portion exposed to ultraviolet rays on the substrate P. Therefore, after exposure, the substrate P is immediately immersed in a plating solution containing palladium ions for a certain period of time, so that a pattern layer of palladium is formed (deposited).
- Such a plating process is an additive process, but may be based on an etching process as a subtractive process.
- the substrate P sent to the pattern writing apparatus EX is made of PET or PEN as a base material, and a metal thin film such as aluminum (Al) or copper (Cu) is deposited on the entire surface or selectively, and further, It is preferable that a photoresist layer is laminated thereon.
- the pattern drawing apparatus EX transfers the substrate P, which has been transported from the process device in the previous process, to the process device (including a single processing unit or a plurality of processing units) at a predetermined speed while transporting the substrate P at a predetermined speed.
- the pattern drawing apparatus EX corresponds to a pattern for an electronic device (for example, a pattern of electrodes and wiring of TFTs constituting the electronic device) on the surface of the substrate P (the surface of the photosensitive functional layer, that is, the photosensitive surface). Irradiate a light pattern. Thereby, a latent image (modified portion) corresponding to the pattern is formed on the photosensitive functional layer.
- the pattern drawing apparatus EX is a direct drawing type exposure apparatus that does not use a mask as shown in FIG. 1, that is, a so-called spot scanning type exposure apparatus (drawing apparatus).
- the exposure apparatus EX performs pattern exposure for each part of the rotating drum DR that supports the substrate P and conveys it in the longitudinal direction for sub-scanning, and the substrate P that is supported in a cylindrical surface by the rotating drum DR.
- drawing units Un U1 to U6
- each of the plurality of drawing units Un receives spot light SP of a pulsed beam LB (pulse beam) for exposure
- the intensity of the spot light SP is measured with pattern data (drawing data) while one-dimensionally scanning (main scanning) with a polygon mirror (scanning member) in a predetermined scanning direction (Y direction) on the irradiated surface (photosensitive surface) of the substrate P.
- Modulation on / off at high speed according to the pattern information).
- a light pattern corresponding to a predetermined pattern such as an electronic device, a circuit, or a wiring is drawn and exposed on the irradiated surface of the substrate P.
- the spot light SP is relatively two-dimensionally scanned on the surface to be irradiated (the surface of the photosensitive functional layer) of the substrate P by the sub-scanning of the substrate P and the main scanning of the spot light SP.
- a predetermined pattern is drawn and exposed on the irradiated surface.
- a plurality of exposed areas where the pattern is exposed by the exposure apparatus EX are provided at predetermined intervals along the longitudinal direction of the substrate P. It will be. Since an electronic device is formed in this exposed region, the exposed region is also a device forming region.
- the rotary drum DR has a central axis AXo extending in the Y direction and extending in a direction intersecting with the direction in which gravity works, and a cylindrical outer peripheral surface having a constant radius from the central axis AXo.
- the rotating drum DR rotates around the central axis AXo while supporting (holding) a part of the substrate P by bending the outer surface (circumferential surface) into a cylindrical surface in the longitudinal direction. P is transported in the longitudinal direction.
- the rotating drum DR supports an area (part) on the substrate P onto which the beam LB (spot light SP) from each of the plurality of drawing units Un (U1 to U6) is projected on its outer peripheral surface.
- the rotating drum DR supports (holds and holds) the substrate P from the surface (back surface) opposite to the surface on which the electronic device is formed (surface on which the photosensitive surface is formed).
- shafts (not shown) supported by bearings are provided so as to rotate the rotating drum DR around the central axis AXo.
- the shaft is given a rotational torque from a rotational drive source (not shown) (for example, a motor or a speed reduction mechanism), and the rotary drum DR rotates around the central axis AXo at a constant rotational speed.
- the light source device (pulse light source device) LS generates and emits a pulsed beam (pulse beam, pulse light, laser) LB.
- This beam LB is ultraviolet light having sensitivity to the photosensitive layer of the substrate P and having a peak wavelength in a wavelength band of 370 nm or less.
- the light source device LS emits a beam LB that emits pulses at a frequency (oscillation frequency, predetermined frequency) Fa according to control of a drawing control device 200 (not illustrated) (described in FIG. 4).
- the light source device LS includes a semiconductor laser element that generates pulsed light in the infrared wavelength range, a fiber amplifier, and a wavelength conversion element (harmonic) that converts the amplified pulsed light in the infrared wavelength range into pulsed light in the ultraviolet wavelength range.
- a fiber amplifier laser light source including a wave generating element).
- the light source device LS is a fiber amplifier laser light source and the pulse generation of the beam LB is turned on / off at high speed according to the state of the pixels constituting the drawing data (logical value “0” or “1”).
- the state of the pixels constituting the drawing data logical value “0” or “1”.
- a beam LB emitted from the light source device LS includes a selection optical element OSn (OS1 to OS6) as a plurality of switching elements, a plurality of reflection mirrors M1 to M12, a plurality of incident mirrors IMn (IM1 to IM6), The light is selectively (alternatively) supplied to each of the drawing units Un (U1 to U6) via a beam switching unit including an absorber TR and the like.
- the selection optical element OSn (OS1 to OS6) is transmissive to the beam LB, and is driven by an ultrasonic signal so that the first-order diffracted light of the incident beam LB is used as a drawing beam LBn.
- the plurality of selection optical elements OSn and the plurality of incident mirrors IMn are provided corresponding to each of the plurality of drawing units Un.
- the selection optical element OS1 and the incident mirror IM1 are provided corresponding to the drawing unit U1
- the selection optical element OS2 to OS6 and the incidence mirror IM2 to IM6 correspond to the drawing units U2 to U6, respectively. Is provided.
- the beam LB from the light source device LS is guided to the absorber TR by the reflection mirrors M1 to M12 whose optical paths are bent in a plane parallel to the XY plane.
- OSn selection optical elements
- OS6 selection optical elements
- a plurality of lenses are provided in the beam optical path from the reflection mirror M1 to the absorber TR, and the plurality of lenses converge the beam LB from the parallel light flux.
- the beam LB that diverges after convergence is returned to a parallel light flux.
- the beam LB from the light source device LS travels in the ⁇ X direction parallel to the X axis and enters the reflection mirror M1.
- the beam LB reflected in the ⁇ Y direction by the reflection mirror M1 enters the reflection mirror M2.
- the beam LB reflected in the + X direction by the reflection mirror M2 passes through the selection optical element OS5 linearly and reaches the reflection mirror M3.
- the beam LB reflected in the ⁇ Y direction by the reflection mirror M3 enters the reflection mirror M4.
- the beam LB reflected in the ⁇ X direction by the reflection mirror M4 is linearly transmitted through the selection optical element OS6 and reaches the reflection mirror M5.
- the beam LB reflected in the ⁇ Y direction by the reflection mirror M5 enters the reflection mirror M6.
- the beam LB reflected in the + X direction by the reflection mirror M6 is linearly transmitted through the selection optical element OS3 and reaches the reflection mirror M7.
- the beam LB reflected in the ⁇ Y direction by the reflection mirror M7 enters the reflection mirror M8.
- the beam LB reflected in the ⁇ X direction by the reflection mirror M8 is linearly transmitted through the selection optical element OS4 and reaches the reflection mirror M9.
- the beam LB reflected in the ⁇ Y direction by the reflection mirror M9 enters the reflection mirror M10.
- the beam LB reflected in the + X direction by the reflection mirror M10 is linearly transmitted through the selection optical element OS1 and reaches the reflection mirror M11.
- the beam LB reflected in the ⁇ Y direction by the reflection mirror M11 enters the reflection mirror M12.
- the beam LB reflected in the ⁇ X direction by the reflection mirror M12 is linearly transmitted through the selection optical element OS2 and guided to the absorber TR.
- the absorber TR is an optical trap that absorbs the beam LB in order to suppress leakage of the beam LB to the outside.
- each of the selection optical elements OSn (OS1 to OS6) has a function of deflecting the optical path of the beam LB from the light source device LS.
- the selection optical element OSn (OS1 to OS6) is turned on to generate the beam LBn (LB1 to LB6) as the first-order diffracted light.
- OS1 to OS6 deflect (or select) the beam LB from the light source device LS.
- the beams LBn (LB1 to LB6) deflected by each of the selection optical elements OSn are It is lower than the intensity of the original beam LB.
- the drawing control device 200 see FIG.
- Each of the selection optical elements OSn is installed so as to deflect the drawing beam LBn (LB1 to LB6), which is the deflected first-order diffracted light, in the ⁇ Z direction with respect to the incident beam LB.
- Beams LBn (LB1 to LB6) deflected and emitted from each of the selection optical elements OSn are projected onto incident mirrors IMn (IM1 to IM6) provided at positions away from each of the selection optical elements OSn by a predetermined distance. Is done.
- Each incident mirror IMn reflects the incident beam LBn (LB1 to LB6) in the ⁇ Z direction, thereby guiding the beam LBn (LB1 to LB6) to the corresponding drawing unit Un (U1 to U6).
- each selection optical element OSn may be used.
- Each of the plurality of optical elements for selection OSn turns on / off generation of diffracted light (beam LBn) obtained by diffracting the incident beam LB in accordance with on / off of a drive signal (ultrasonic signal) from the drawing control apparatus 200.
- the selection optical element OS5 transmits the beam LB from the incident light source device LS without being deflected (diffracted) when the drive signal (high frequency signal) from the drawing control device 200 is not applied and is in the off state. . Therefore, the beam LB transmitted through the selection optical element OS5 enters the reflection mirror M3.
- the selection optical element OS5 when the selection optical element OS5 is in the on state, the incident beam LB is deflected (diffracted) and directed to the incident mirror IM5. That is, the switching (beam selection) operation by the selection optical element OS5 is controlled by turning on / off the drive signal. In this way, the switching operation of each selection optical element OSn can guide the beam LB from the light source device LS to any one drawing unit Un, and switch the drawing unit Un on which the beam LBn is incident. Can do. As described above, the plurality of selection optical elements OSn are arranged in series so that the beams LB from the light source device LS pass in order, and the beams LBn are supplied to the corresponding drawing units Un in a time division manner. Is disclosed in International Publication No. 2015/166910.
- each of the selection optical elements OSn (OS1 to OS6) constituting the beam switching unit is turned on for a predetermined time is, for example, OS1 ⁇ OS2 ⁇ OS3 ⁇ OS4 ⁇ OS5 ⁇ OS6 ⁇ OS1 ⁇ .
- This order is determined by the order of the scanning start timing by the spot light set in each of the drawing units Un (U1 to U6). That is, in the present embodiment, any one of the drawing units U1 to U6 is synchronized with the rotation speed of the polygon mirror provided in each of the six drawing units U1 to U6 in synchronization with the rotation angle phase. It is possible to switch to the time division so that one reflection surface of the polygon mirror in one of them performs one spot scanning on the substrate P.
- the order of spot scanning of the drawing unit Un may be any as long as the phase of the rotation angle of each polygon mirror of the drawing unit Un is synchronized in a predetermined relationship.
- three drawing units U1, U3, U5 are arranged in the Y direction on the upstream side in the transport direction of the substrate P (the direction in which the outer peripheral surface of the rotary drum DR moves in the circumferential direction).
- Three drawing units U2, U4, U6 are arranged in the Y direction on the downstream side in the transport direction.
- pattern drawing on the substrate P is started from the upstream odd-numbered drawing units U1, U3, and U5. Since pattern drawing is also started, the order of spot scanning of the drawing unit Un can be set as U1 ⁇ U3 ⁇ U5 ⁇ U2 ⁇ U4 ⁇ U6 ⁇ U1 ⁇ . Therefore, the order in which each of the selection optical elements OSn (OS1 to OS6) is turned on for a predetermined time is determined as OS1 ⁇ OS3 ⁇ OS5 ⁇ OS2 ⁇ OS4 ⁇ OS6 ⁇ OS1 ⁇ . Even when the selection optical element OSn corresponding to the drawing unit Un having no pattern to be drawn is in the turn-on order, the on / off switching control of the selection optical element OSn is based on the drawing data. By doing so, the selection optical element OSn is forcibly maintained in the OFF state, so that spot scanning by the drawing unit Un is not performed.
- each of the drawing units U1 to U6 is provided with a polygon mirror PM for main scanning the incident beams LB1 to LB6.
- the polygon mirrors PM of the respective drawing units Un are synchronously controlled so as to maintain a constant rotational angle phase with each other while precisely rotating at the same rotational speed.
- the main scanning timing (main scanning period of the spot light SP) of each of the beams LB1 to LB6 projected onto the substrate P from each of the drawing units U1 to U6 can be set so as not to overlap each other.
- each of the selection optical elements OSn (OS1 to OS6) provided in the beam switching unit is controlled in synchronization with the rotation angle positions of the six polygon mirrors PM, thereby providing a light source.
- An efficient exposure process can be performed in which the beam LB from the apparatus LS is distributed in time division to each of the plurality of drawing units Un.
- the exposure apparatus EX is a so-called multi-head direct drawing exposure apparatus in which a plurality of drawing units Un (U1 to U6) having the same configuration are arranged.
- Each of the drawing units Un draws a pattern for each partial region partitioned in the Y direction of the substrate P supported by the outer peripheral surface (circumferential surface) of the rotary drum DR.
- Each drawing unit Un (U1 to U6) condenses (converges) the beam LBn on the substrate P while projecting the beam LBn from the beam switching unit onto the substrate P (on the irradiated surface of the substrate P). Thereby, the beam LBn (LB1 to LB6) projected onto the substrate P becomes the spot light SP.
- the spot light SP of the beam LBn (LB1 to LB6) projected on the substrate P is scanned in the main scanning direction (Y direction) by the rotation of the polygon mirror PM of each drawing unit Un.
- the drawing line SLn is also a scanning locus on the substrate P of the spot light SP of the beam LBn.
- the drawing unit U1 scans the spot light SP along the drawing line SL1, and similarly, the drawing units U2 to U6 scan the spot light SP along the drawing lines SL2 to SL6.
- the drawing lines SLn (SL1 to SL6) of the plurality of drawing units Un (U1 to U6) include a central plane that includes the central axis AXo of the rotary drum DR and is parallel to the YZ plane. It is arranged in a staggered arrangement in two rows in the circumferential direction of DR.
- the odd-numbered drawing lines SL1, SL3, SL5 are located on the irradiated surface of the substrate P on the upstream side ( ⁇ X direction side) in the transport direction of the substrate P with respect to the center surface, and along the Y direction. They are arranged in a row at a predetermined interval.
- the even-numbered drawing lines SL2, SL4, SL6 are located on the irradiated surface of the substrate P on the downstream side (+ X direction side) in the transport direction of the substrate P with respect to the center surface, and are predetermined along the Y direction. Are arranged in a row separated by an interval of.
- a plurality of drawing units Un (U1 to U6) are also arranged in a staggered arrangement in two rows in the transport direction of the substrate P across the center plane, and odd-numbered drawing units U1, U3, U5 and even-numbered drawing
- the units U2, U4, and U6 are provided symmetrically with respect to the center plane when viewed in the XZ plane.
- the odd-numbered drawing lines SL1, SL3, SL5 and the even-numbered drawing lines SL2, SL4, SL6 are separated from each other, but the Y direction ( With respect to the width direction of the substrate P and the main scanning direction), they are set to be joined together without being separated from each other.
- the drawing lines SL1 to SL6 are substantially parallel to the width direction of the substrate P, that is, the central axis AXo of the rotary drum DR.
- splicing the drawing line SLn in the Y direction means that the end of the drawing line SLn is such that the pattern drawn in each of the drawing lines SLn adjacent in the Y direction is spliced in the Y direction on the substrate P. This means that the positions in the Y direction are adjacent or partially overlapped.
- the length of each drawing line SLn may be overlapped within a range of several percent or less in the Y direction including the drawing start point or the drawing end point. .
- the plurality of drawing units Un share the Y-direction scanning area (the main scanning range section) so as to cover the width dimension of the exposure area on the substrate P in total. ing.
- the main scanning range in the Y direction the length of the drawing line SLn
- drawing can be performed by arranging a total of six drawing units U1 to U6 in the Y direction.
- the width in the Y direction of a large exposure area is increased to about 180 to 360 mm.
- the length of each drawing line SLn (SL1 to SL6) (length of the drawing range) is basically the same. That is, the scanning distance of the spot light SP of the beam LBn scanned along each of the drawing lines SL1 to SL6 is basically the same.
- the spot light SP projected on the drawing line SLn during the main scanning is the beam It becomes discrete according to the oscillation frequency Fa (for example, 400 MHz) of the LB. Therefore, it is necessary to overlap the spot light SP projected by one pulse light of the beam LB and the spot light SP projected by the next one pulse light in the main scanning direction.
- the amount of overlap is set by the size ⁇ of the spot light SP, the scanning speed (main scanning speed) Vs of the spot light SP, and the oscillation frequency Fa of the beam LB.
- the effective size (diameter) ⁇ of the spot light SP is 1 / e 2 (or 1/2) of the peak intensity of the spot light SP when the intensity distribution of the spot light SP is approximated by a Gaussian distribution. Determined by width dimension.
- the scanning speed Vs of the spot light SP rotational speed of the polygon mirror PM
- the spot light SP so that the spot light SP overlaps the effective size (dimension) ⁇ by about ⁇ ⁇ 1 ⁇ 2.
- the oscillation frequency Fa is set. Therefore, the projection interval along the main scanning direction of the pulsed spot light SP is ⁇ / 2.
- the substrate P is effective for the spot light SP between one scanning of the spot light SP along the drawing line SLn and the next scanning. It is desirable to set so as to move by a distance of about 1 ⁇ 2 of a large size ⁇ . Further, when drawing lines SLn adjacent in the Y direction are continued in the main scanning direction, it is desirable to overlap by ⁇ / 2. In the present embodiment, the size (dimension) ⁇ of the spot light SP is set to about 3 to 4 ⁇ m.
- Each drawing unit Un (U1 to U6) is set so that each beam LBn travels toward the central axis AXo of the rotary drum DR when viewed in the XZ plane.
- the optical path (beam principal ray) of the beam LBn traveling from each drawing unit Un (U1 to U6) toward the substrate P becomes parallel to the normal line of the irradiated surface of the substrate P in the XZ plane.
- the beam LBn irradiated from each of the drawing units Un (U1 to U6) to the drawing line SLn (SL1 to SL6) is relative to the tangential plane at the drawing line SLn on the surface of the substrate P curved into a cylindrical surface. It is projected toward the substrate P so as to be always vertical. That is, with respect to the main scanning direction of the spot light SP, the beams LBn (LB1 to LB6) projected onto the substrate P are scanned in a telecentric state.
- the drawing unit U1 includes at least reflecting mirrors M20 to M24, a polygon mirror PM, and an f ⁇ lens system (drawing scanning lens) FT.
- a first cylindrical lens CYa (see FIG. 2) is disposed in front of the polygon mirror PM when viewed from the traveling direction of the beam LB1, and an f ⁇ lens system (f- ⁇ lens system).
- a second cylindrical lens CYb (see FIG. 2) is provided after the FT.
- the first cylindrical lens CYa and the second cylindrical lens CYb correct the position variation of the spot light SP (drawing line SL1) in the sub-scanning direction due to the tilt error of each reflecting surface of the polygon mirror PM.
- the beam LB1 reflected in the ⁇ Z direction by the incident mirror IM1 enters the reflection mirror M20 provided in the drawing unit U1, and the beam LB1 reflected by the reflection mirror M20 advances in the ⁇ X direction and enters the reflection mirror M21.
- the beam LB1 reflected in the ⁇ Z direction by the reflection mirror M21 enters the reflection mirror M22, and the beam LB1 reflected by the reflection mirror M22 advances in the + X direction and enters the reflection mirror M23.
- the reflection mirror M23 reflects the incident beam LB1 toward the reflection surface RP of the polygon mirror PM so as to be bent in a plane parallel to the XY plane.
- the polygon mirror PM reflects the incident beam LB1 toward the + ⁇ direction toward the f ⁇ lens system FT.
- the polygon mirror PM deflects (reflects) the incident beam LB1 one-dimensionally in a plane parallel to the XY plane in order to scan the spot light SP of the beam LB1 on the irradiated surface of the substrate P.
- the polygon mirror (rotating polygonal mirror, scanning member) PM includes a rotation axis AXp extending in the Z-axis direction, and a plurality of reflecting surfaces RP (mainly formed around the rotation axis AXp and in parallel with the rotation axis AXp). In the embodiment, the number Np of the reflecting surfaces RP is 8).
- the reflection angle of the pulsed beam LB1 irradiated on the reflection surface can be continuously changed by rotating the polygon mirror PM around the rotation axis AXp in a predetermined rotation direction.
- the beam LB1 is deflected by one reflecting surface RP, and the spot light SP of the beam LB1 irradiated on the irradiated surface of the substrate P is scanned along the main scanning direction (the width direction of the substrate P, the Y direction). can do.
- the number of drawing lines SL1 in which the spot light SP is scanned on the irradiated surface of the substrate P by one rotation of the polygon mirror PM is eight, which is the same as the number of the reflecting surfaces RP.
- the f ⁇ lens system (scanning lens, scanning optical system) FT is a telecentric scanning lens that projects the beam LB1 reflected by the polygon mirror PM onto the reflecting mirror M24.
- the beam LB1 transmitted through the f ⁇ lens system FT is projected onto the substrate P as the spot light SP through the reflection mirror M24.
- the reflection mirror M24 reflects the beam LB1 toward the substrate P so that the beam LB1 travels toward the central axis AXo of the rotary drum DR with respect to the XZ plane.
- the incident angle ⁇ of the beam LB1 to the f ⁇ lens system FT varies depending on the rotation angle ( ⁇ / 2) of the polygon mirror PM.
- the f ⁇ lens system FT projects the beam LB1 to the image height position on the irradiated surface of the substrate P in proportion to the incident angle ⁇ through the reflection mirror M24.
- the focal length of the f ⁇ lens system FT is fo and the image height position is yo
- a surface (parallel to the XY plane) on which the beam LB1 incident on the f ⁇ lens system FT is deflected in one dimension by the polygon mirror PM is a surface including the optical axis AXf of the f ⁇ lens system FT.
- the optical configuration of the drawing units Un (U1 to U6) will be described with reference to FIG.
- the drawing unit Un along the traveling direction of the beam LBn from the incident position of the beam LBn to the irradiated surface (substrate P), the reflection mirror M20, the reflection mirror M20a, and the polarization beam splitter BS1.
- an origin sensor that detects the angular position of each reflecting surface of the polygon mirror PM in order to detect the drawing start possible timing (scanning start timing of the spot light SP) of the drawing unit Un.
- a beam transmitting system 60a and a beam receiving system 60b are provided.
- the reflected light of the beam LBn reflected by the irradiated surface of the substrate P (or the surface of the rotating drum DR) is converted into the f ⁇ lens system FT, the polygon mirror PM, the polarization beam splitter BS1, and the like.
- a photodetector (photoelectric sensor) DTc for detection via the DTc is provided.
- the beam LBn incident on the drawing unit Un travels in the ⁇ Z direction along the optical axis AX1 parallel to the Z axis, and is incident on the reflection mirror M20 inclined by 45 ° with respect to the XY plane.
- the beam LBn reflected by the reflection mirror M20 travels in the ⁇ X direction toward the reflection mirror M20a that is separated from the reflection mirror M20 in the ⁇ X direction.
- the reflection mirror M20a is disposed with an inclination of 45 ° with respect to the YZ plane, and reflects the incident beam LBn toward the polarization beam splitter BS1 in the ⁇ Y direction.
- the polarization separation surface of the polarization beam splitter BS1 is disposed at an angle of 45 ° with respect to the YZ plane, reflects a P-polarized beam, and transmits a linearly polarized (S-polarized) beam polarized in a direction orthogonal to the P-polarized light. If the beam LBn incident on the drawing unit Un is a P-polarized beam, the polarization beam splitter BS1 reflects the beam LBn from the reflection mirror M20a in the ⁇ X direction and guides it to the reflection mirror M21 side.
- the reflection mirror M21 is disposed at an angle of 45 ° with respect to the XY plane, and reflects the incident beam LBn in the ⁇ Z direction toward the reflection mirror M22 that is separated from the reflection mirror M21 in the ⁇ Z direction.
- the beam LBn reflected by the reflection mirror M21 enters the reflection mirror M22.
- the reflection mirror M22 is disposed with an inclination of 45 ° with respect to the XY plane, and reflects the incident beam LBn toward the reflection mirror M23 in the + X direction.
- the beam LBn reflected by the reflection mirror M22 enters the reflection mirror M23 via a ⁇ / 4 wavelength plate (not shown) and a cylindrical lens CYa.
- the reflection mirror M23 reflects the incident beam LBn toward the polygon mirror PM.
- the polygon mirror PM reflects the incident beam LBn toward the + X direction toward an f ⁇ lens system FT having an optical axis AXf parallel to the X axis.
- the polygon mirror PM deflects (reflects) the incident beam LBn one-dimensionally in a plane parallel to the XY plane in order to scan the spot light SP of the beam LBn on the irradiated surface of the substrate P.
- the polygon mirror PM has a plurality of reflecting surfaces (each side of a regular octagon in this embodiment) formed around a rotation axis AXp extending in the Z-axis direction, and is rotated by a rotation motor RM coaxial with the rotation axis AXp. Is done.
- the rotation motor RM is rotated at a constant rotation speed (for example, about 30,000 to 40,000 rpm) by a polygon rotation control unit provided in the drawing control apparatus 200 (see FIG. 4).
- the effective length (for example, 50 mm) of the drawing lines SLn is the maximum scanning length (for example, 52 mm) at which the spot light SP can be scanned by the polygon mirror PM.
- the length is set as follows, and in the initial setting (design), the center point of the drawing line SLn (the point through which the optical axis AXf of the f ⁇ lens system FT passes) is set at the center of the maximum scanning length.
- the cylindrical lens CYa converges the incident beam LBn on the reflection surface of the polygon mirror PM in the sub-scanning direction (Z direction) orthogonal to the main scanning direction (rotation direction) of the polygon mirror PM. That is, the cylindrical lens CYa converges the beam LBn in a slit shape (ellipse shape) extending in a direction parallel to the XY plane on the reflection surface of the polygon mirror PM.
- the incident angle ⁇ of the beam LBn to the f ⁇ lens system FT (the angle with respect to the optical axis AXf) varies depending on the rotation angle ( ⁇ / 2) of the polygon mirror PM.
- the incident angle ⁇ of the beam LBn to the f ⁇ lens system FT is 0 degree
- the beam LBn incident on the f ⁇ lens system FT advances along the optical axis AXf.
- the beam LBn from the f ⁇ lens system FT is reflected in the ⁇ Z direction by the reflecting mirror M24, and is projected toward the substrate P through the cylindrical lens CYb.
- the beam LBn projected onto the substrate P by the f ⁇ lens system FT and the cylindrical lens CYb whose generating line is parallel to the Y direction is a minute spot light having a diameter of about several ⁇ m (for example, 2 to 3 ⁇ m) on the irradiated surface of the substrate P. Converged to SP.
- the beam LBn incident on the drawing unit Un is bent along the optical path cranked in a U-shape from the reflection mirror M20 to the substrate P when viewed in the XZ plane, and proceeds in the ⁇ Z direction to the substrate. Projected to P.
- Each of the six drawing units U1 to U6 scans the spot light SP of the beams LB1 to LB6 one-dimensionally in the main scanning direction (Y direction) and conveys the substrate P in the longitudinal direction, thereby The irradiated surface is relatively two-dimensionally scanned by the spot light SP, and the pattern drawn on each of the drawing lines SL1 to SL6 is exposed on the substrate P in a state where the patterns are joined in the Y direction.
- the effective scanning length LT of the drawing lines SLn is 50 mm
- the effective diameter ⁇ of the spot light SP is 4 ⁇ m
- the oscillation frequency Fa of the pulse emission of the beam LB from the light source device LS is 400 MHz.
- the pulsed light is emitted so that the spot light SP overlaps by 1/2 of the diameter ⁇ along the drawing line SLn (main scanning direction)
- the pixel size Pxy defined on the drawing data is set to 4 ⁇ m square on the substrate P, and one pixel is exposed by two pulses of the spot light SP in each of the main scanning direction and the sub-scanning direction.
- the scanning speed Vsp when the scanning efficiency 1 / ⁇ is 0.3 ( ⁇ 3.33) and the scanning length LT is 50 mm, the relationship between the formula A and the 8-sided polygon mirror PM
- the rotational position of the reflection surface RP of the polygon mirror PM is just before the scanning of the spot light SP of the drawing beam LBn by the reflection surface RP can be started.
- An origin signal SZn having a waveform change is generated at the moment when it reaches a predetermined position (specified angle position, origin angle position). Since the polygon mirror PM has eight reflecting surfaces RP, the beam receiving system 60b outputs eight origin signals SZn during one rotation of the polygon mirror PM.
- the origin signal SZn is sent to the drawing control apparatus 200 (see FIG. 4), and scanning of the spot light SP along the drawing line SLn is started after a predetermined delay time Tdn has elapsed since the origin signal SZn is generated.
- FIG. 3 is a diagram showing a specific configuration around the optical element for selection OSn (OS1 to OS6) and the incident mirror IMn (IM1 to IM6).
- the beam LB emitted from the light source device LS is incident on the selection optical element OSn as a parallel light beam having a minute diameter (first diameter) of 1 mm or less, for example.
- the drive signal DFn which is a high-frequency signal (ultrasonic signal)
- the incident beam LB is transmitted without being diffracted by the selection optical element OSn.
- the transmitted beam LB passes through the condensing lens Ga and the collimating lens Gb provided on the optical path along the optical axis AXb, and enters the selection optical element OSn at the subsequent stage.
- the beam LB passing through the condenser lens Ga and the collimator lens Gb through the selection optical element OSn is coaxial with the optical axis AXb.
- the condensing lens Ga condenses the beam LB (parallel light beam) transmitted through the selection optical element OSn so as to be a beam waist at the position of the surface Ps located between the condensing lens Ga and the collimating lens Gb.
- the collimating lens Gb turns the beam LB diverging from the position of the surface Ps into a parallel light beam.
- the diameter of the beam LB converted into a parallel light beam by the collimating lens Gb is the first diameter.
- the rear focal position of the condensing lens Ga and the front focal position of the collimating lens Gb coincide with the surface Ps within a predetermined allowable range, and the front focal position of the condensing lens Ga is within the selection optical element OSn. It arrange
- the incident beam LB is diffracted with the beam LBn (first-order diffracted light) diffracted by the selection optical element OSn.
- the zeroth-order beam LBnz that has not occurred is generated.
- the intensity of the incident beam LB is 100% and the decrease due to the transmittance of the optical element for selection OSn is ignored, the intensity of the diffracted beam LBn is about 80% at the maximum, and the remaining 20% is the 0th order. It becomes the intensity of the beam LBnz.
- the 0th-order beam LBnz passes through the condensing lens Ga and the collimating lens Gb, passes through the subsequent selection optical element OSn, and is absorbed by the absorber TR.
- the beam LBn (parallel light beam) deflected in the ⁇ Z direction with a diffraction angle corresponding to the high frequency of the drive signal DFn passes through the condenser lens Ga and travels toward the incident mirror IMn provided on the surface Ps. Since the front focal position of the condensing lens Ga is optically conjugate with the diffraction point in the optical element for selection OSn, the beam LBn from the condensing lens Ga toward the incident mirror IMn has a position decentered from the optical axis AXb.
- the light travels in parallel with the axis AXb and is condensed (converged) so as to be a beam waist at the position of the surface Ps.
- the position of the beam waist is set so as to be optically conjugate with the spot light SP projected onto the substrate P through the drawing unit Un.
- the beam LBn deflected (diffracted) by the selection optical element OSn is reflected in the ⁇ Z direction by the incident mirror IMn, and collimated lens Gc. And enters the drawing unit Un along the optical axis AX1 (see FIGS. 2 and 3).
- the collimating lens Gc turns the beam LBn converged / diverged by the condenser lens Ga into a parallel light beam coaxial with the optical axis (AX1) of the collimating lens Gc.
- the diameter of the beam LBn made into a parallel light beam by the collimating lens Gc is substantially the same as the first diameter.
- the rear focal point of the condensing lens Ga and the front focal point of the collimating lens Gc are arranged on or near the reflecting surface of the incident mirror IMn within a predetermined allowable range.
- the front focal position of the condenser lens Ga and the diffraction point in the optical element for selection OSn are optically conjugated, and the incident mirror IMn is disposed on the surface Ps that is the rear focal position of the condenser lens Ga.
- ) is the maximum range of the deflection angle of the optical element for selection OSn itself, the size of the reflecting surface of the incident mirror IMn, and the optical system (relay system) up to the polygon mirror PM in the drawing unit Un. Although it is limited by the magnification, the width in the Z direction of the reflecting surface RP of the polygon mirror PM, the magnification from the polygon mirror PM to the substrate P (magnification of the f ⁇ lens system FT), etc., the effective spot light SP on the substrate P is limited. Adjustment is possible within the range of the size (diameter) or the pixel size (Pxy) defined on the drawing data.
- an overlay error between a new pattern drawn on the substrate P in each drawing unit Un and a pattern formed on the substrate P, or a new pattern drawn on the substrate P in each drawing unit Un It is possible to correct a joint error between various patterns with high accuracy and at high speed.
- FIG. 4 is a schematic diagram of a beam switching unit including a selection optical element OSn (OS1 to OS6) for selectively distributing the beam LB from the light source device LS to any one of the six drawing units U1 to U6.
- the configuration is shown. 4 are the same as those shown in FIG. 1, but the reflection mirrors M1 to M12 shown in FIG. 1 are omitted as appropriate.
- a light source device LS composed of a fiber amplifier laser light source is connected to the drawing control device 200 and exchanges various control information SJ.
- the light source device LS includes a clock circuit that generates a clock signal CLK having an oscillation frequency Fa (for example, 400 MHz) when causing the beam LB to emit pulses, and performs drawing for each drawing unit Un sent from the drawing control device 200.
- the beam LBn is transmitted in response to the clock signal CLK in burst mode (emission for a predetermined number of clock pulses and a predetermined number of clock pulses). Pulse light emission). As described above, in the present embodiment, the light source device LS itself modulates the intensity of the beam LB for pattern drawing (switching on / off of pulsed light emission).
- the drawing control apparatus 200 receives the origin signal SZn (SZ1 to SZ6) output from the beam receiving unit (beam receiving system, light receiving system) 60b of the origin sensor of each of the drawing units U1 to U6 and inputs the drawing units U1 to U6.
- a polygon rotation control unit that controls the rotation motor RM of the polygon mirror PM and a selection optical element OSn (OS1 to OS6) so that the rotation speed and rotation angle phase of each polygon mirror PM of U6 are designated.
- SZn SZ1 to SZ6
- the beam LB from the light source device LS passes through the optical element for selection OS5 ⁇ OS6 ⁇ OS3 ⁇ OS4 ⁇ OS1 ⁇ OS2 in accordance with the arrangement of FIG.
- the selection optical element OS4 out of the six selection optical elements OS1 to OS6 is selected and turned on, and the beam LB from the light source device LS (the drawing data SDn of the pattern drawn by the drawing unit U4) Is modulated toward the incident mirror IM4 and is supplied to the drawing unit U4 as a beam LB4.
- the order of the selection optical elements OSn from the light source device LS depends on the transmittance and diffraction efficiency of each of the selection optical elements OSn.
- the intensity of the selected beams LB1 to LB6 the peak intensity of the pulsed light
- the relative difference in the intensity of the beams LB1 to LB6 incident on each of the drawing units U1 to U6 is within a predetermined allowable range ( For example, it is necessary to adjust (align) within ⁇ 5%, preferably within ⁇ 2%.
- the intensity of each of the beams LB1 to LB6 incident on each of the drawing units U1 to U6 is set to the level of each of the drive signals DF1 to DF6 (high frequency signal) for driving each of the selection optical elements OS1 to OS6.
- the amplitude or power) is changed and adjusted.
- photoelectric sensors DTa, DTb, and DT1 to DT6 for detecting the beam intensity are provided at several locations in the optical path through which the beam LB from the light source device LS passes.
- the intensity of each of the beams LB1 to LB6 supplied to each of the drawing units U1 to U6 is monitored.
- the photoelectric sensor DTa first photoelectric sensor
- the incoming leakage light is received and a photoelectric signal corresponding to the intensity is output.
- the photoelectric signal from the photoelectric sensor DTa is input to a detection circuit CKa including an amplifier, a sample hold circuit, an analog / digital converter, and the detection circuit CKa outputs a detection signal Sa corresponding to the intensity of the beam LB from the light source device LS. Output.
- a detection circuit CKa including an amplifier, a sample hold circuit, an analog / digital converter, and the detection circuit CKa outputs a detection signal Sa corresponding to the intensity of the beam LB from the light source device LS.
- the detection circuit CKa including an amplifier, a sample hold circuit, an analog / digital converter, and the detection circuit CKa outputs a detection signal Sa corresponding to the intensity of the beam LB from the light source device LS.
- the detection circuit CKa including an amplifier, a sample hold circuit, an analog / digital converter, and the detection circuit CKa outputs a detection signal Sa corresponding to the intensity of the beam LB from the light source device LS.
- the detection circuit CKa
- the photoelectric sensor DTb (second photoelectric sensor) is in front of the absorber TR that is incident after the beam LB from the light source device LS sequentially passes through the six selection optical elements OS5, OS6, OS3, OS4, OS1, and OS2.
- the beam (0th-order light) transmitted through the partial reflection mirror Mb disposed at the position is received.
- the partial reflection mirror Mb is a beam that amplitude-divides a beam (zero-order light) that has passed through the last-stage selection optical element OS2 among the six selection optical elements OS1 to OS6 into the absorber TR and the photoelectric sensor DTb. Functions as a splitter.
- the photoelectric signal output from the photoelectric sensor DTb is input to a detection circuit CKb including an amplifier, a sample-and-hold circuit, an analog / digital converter, and the like.
- the detection circuit CKb passes through the final-stage selection optical element OS2 ( A detection signal Sb corresponding to the intensity of the 0th order light is output.
- the detection signals Sa and Sb output from the detection circuits CKa and CKb are adjusted (calibrated) so as to have the same value when the intensities of the beams received by the photoelectric sensors DTa and DTb are the same. It shall be.
- Photoelectric sensors DT1 to DT6 are provided which receive the leakage light of the beam LBn from the reflection mirror M22.
- the reflecting surface of the reflecting mirror M22 reflects most of the incident beam LBn (for example, about 98%), but the remaining intensity is transmitted as leakage light.
- the photoelectric signals Sm1 to Sm6 from the photoelectric sensors DT1 to DT6 are amplified by detection circuits similar to the detection circuits CKa and CKb, respectively, and correspond to the intensities of the photoelectric signals Sm1 to Sm6.
- the measured signal (digital value) is generated.
- These measurement signals are used for actual exposure control.
- exposure control is performed based on the intensity of each of the photoelectric signals Sm1 to Sm6.
- Each intensity of the photoelectric signals Sm1 to Sm6 corresponds to the absolute intensity of the spot light SP (beams LB1 to LB6) projected onto the substrate P by each of the drawing units U1 to U6.
- the amplification factor in the detection circuit is calibrated in advance. Therefore, if exposure control (intensity correction) is performed such that the intensity of each of the photoelectric signals Sm1 to Sm6 is within a predetermined allowable range (for example, within ⁇ 2%), the pattern drawn by each of the drawing units U1 to U6 is The exposure is performed with the same exposure amount (dose amount).
- FIG. 5 is provided in the drawing control apparatus 200 of FIG. 4, and includes an intensity adjustment control unit 250 for controlling the exposure amount in each of the drawing units Un, and driving signals of the selection optical elements OS1 to OS6.
- a configuration with drive circuits 251a to 251f for generating DF1 to DF6 is shown.
- the intensity adjustment control unit 250 inputs the photoelectric signals Sm1 to Sm6 (measurement signals after amplification) shown in FIG. 4 and the detection signals Sa and Sb from the detection circuits CKa and CKb, and also in the drawing control apparatus 200.
- Various control information IFD is exchanged with the main control CPU.
- Each of the drive circuits 251a to 251f receives the high frequency signal from the oscillation circuit RF, and the drive signal DF1 adjusted to an amplitude (power) according to the adjustment signals Pw1 to Pw6 from each of the gain adjustment circuits 252a to 252f. ⁇ Output DF6.
- the intensity adjustment control unit (beam intensity measurement unit) 250 changes the adjustment signals Pw1 to Pw6 to each of the gain adjustment circuits 252a to 252f based on the photoelectric signals Sm1 to Sm6, the detection signals Sa and Sb, and the control information IFD. Command information (digital target value) is calculated and sent out by calculation.
- the intensity adjustment control unit 250 adjusts the intensity of each of the beams LB1 to LB6 so that the exposure amount in each of the drawing units Un is aligned with the target value indicated by the control information IFD.
- the intensity adjustment control unit 250 scans each of the selection optical elements OS1 to OS6 for a predetermined time (a period during which one reflecting surface of the polygon mirror PM scans the beam LBn).
- Switching signals LP1 to LP6 for switching to the off state after the on state are output to the drive circuits 251a to 251f.
- Each of the drive circuits 251a to 251f switches between applying and not applying the drive signals DF1 to DF6 to the optical elements for selection OS1 to OS6 in response to the switching signals LP1 to LP6.
- FIG. 6 is a diagram illustrating an example of a change characteristic CCa of diffraction efficiency due to a change in RF power (amplitude of a high-frequency signal) of the drive signal DFn applied to the acousto-optic modulation element as the selection optical element OSn.
- the horizontal axis represents the RF power of the drive signal DFn
- the vertical axis represents the diffraction efficiency (ratio of the intensity of the deflected beam LBn to the intensity of the incident beam LB) ⁇ .
- the diffraction efficiency ⁇ increases as the RF power input within the adjustable range ⁇ Kn increases, and gradually decreases after reaching the maximum diffraction efficiency (upper limit of the adjustable range ⁇ Kn) at a certain power value Pwm. Have a tendency.
- the maximum efficiency is 80% or less, although there are some changes depending on the type of crystal medium of the acousto-optic modulator.
- the lower limit of the adjustable range ⁇ Kn of the efficiency ⁇ can be widened to a relatively low value, and the power value corresponding to the lower limit is Pwo. In FIG.
- the intensity of the beam LB incident on the selection optical element OSn is Eo (100%), the efficiency of the selection optical element OSn is ⁇ n (%), and the transmittance is ⁇ n (%).
- the change characteristic CCa of the efficiency ⁇ changes when the incident angle of the beam LB incident on the selection optical element OSn slightly fluctuates or when the temperature of the crystal medium (or quartz) of the selection optical element OSn changes greatly. Therefore, even if the same RF power is applied to the selection optical element OSn, the efficiency is not the same, and the intensity of the deflected beam LBn varies.
- the transmittance ⁇ n is determined by the absorption characteristics of the incident beam LB in the crystal medium (or quartz), the characteristics of the antireflection film coated on the incident surface and the exit surface, etc., and is usually a constant value that does not vary (for example, 95%). However, when the beam in the ultraviolet wavelength region is passed for a long time, the transmittance ⁇ n may gradually change (decrease) due to deterioration or the like.
- the values of the photoelectric signals Sm1 to Sm6 corresponding to the intensities of the beams LB1 to LB6 measured by the photoelectric sensors DT1 to DT6 shown in FIG. 4 are set corresponding to the appropriate exposure amount.
- the intensity adjustment control unit 250 adjusts (corrects) the supply power (amplitude) of each of the drive signals DF1 to DF6 with feedback so that the target value can be suppressed within, for example, ⁇ 2%. be able to.
- the intensity ⁇ of each of the deflected beams LBn is adjusted by changing the efficiency ⁇ of the optical element for selection OSn.
- such adjustment is limited. There is. This will be described with reference to FIG.
- FIG. 7 shows the intensities of the beams LB1 to LB6 supplied to the drawing units U1 to U6 and the adjustable ranges ⁇ K1 to ⁇ K6 of the selection optical elements OS1 to OS6 for adjusting the intensities of the beams LB1 to LB6. It is the graph shown typically. In FIG. 7, the horizontal axis indicates the intensity and the adjustable range of the beam LBn in each of the drawing units U5, U6, U3, U4, U1, and U2 from the left side in accordance with the order in which the beam LB from the light source device LS is supplied. ⁇ Kn ( ⁇ K1 to ⁇ K6) are arranged. As shown in FIG. 4 (FIG.
- the intensity E5 (value measured by the photoelectric sensor DT5) of the beam LB5 deflected by the foremost selection optical element OS5 closest to the light source device LS is the intensity of the beam LB when the light source device LS is emitted.
- Eo value measured by the photoelectric sensor DTa
- E5 ⁇ 5 ⁇ ⁇ 5 ⁇ Eo is represented by the transmittance ⁇ 5 and the efficiency ⁇ 5 of the optical element for selection OS5.
- the intensity E2 of the beam LB2 deflected by the last-stage selection optical element OS2 farthest from the light source device LS is the product of all the transmittances ⁇ n of the six selection optical elements OS1 to OS6 and the efficiency.
- Setting the efficiency ⁇ 5 of the selection optical element OS5 low means lowering the power value on the efficiency change characteristic CCa shown in FIG. 6, and setting the efficiency ⁇ 2 of the selection optical element OS2 high. That is to increase the power value.
- the efficiency of the optical element OS5 for selection at the foremost stage ⁇ 5 is set below the efficiency (power) adjustable range ⁇ K5
- the efficiency ⁇ 2 of the final stage selection optical element OS2 is set above the efficiency (power) adjustable range ⁇ K2.
- the last-stage selection optical element OS2 is approaching the upper limit (corresponding to the power value Pwm) of the adjustable range ⁇ K2, and the foremost selection optical element OS5 is the lower limit (power) of the adjustable range ⁇ K5. (Corresponding to the value Pwo). Therefore, in FIG. 7, when changing the target values of the intensity of the beams LB1 to LB6, the upper limit of the efficiency adjustable range ⁇ K2 of the selection optical element OS2 and the efficiency adjustable range ⁇ K5 of the selection optical element OS5 The intensity (exposure amount) between the lower limit and the settable range is limited.
- the beam LB from the light source device LS is adjusted so that the intensity of the beam LB2 deflected by the last-stage selection optical element OS2 that receives the most attenuation becomes an appropriate exposure amount with respect to the photosensitive layer of the substrate P.
- the maximum strength (power) is set with some margin. Therefore, when adjusting the appropriate exposure amount due to the difference in the sensitivity of the photosensitive layer of the substrate P and the difference in the thickness of the photosensitive layer, can the target value of the intensity be changed within the intensity (exposure amount) settable range of FIG. No is determined by the drawing control device 200 or the intensity adjustment control unit 250.
- the efficiency ⁇ n of each of the optical elements for selection OS1 to OS6 Is corrected from the current value
- the RF power of each of the drive signals DF1 to DF6 is corrected based on the efficiency change characteristic CCa of FIG.
- the new target value of the intensity of the beams LB1 to LB6 corresponding to the appropriate exposure amount to be adjusted is outside the range where the intensity (exposure amount) can be set in FIG.
- the exposure amount by the beam LB2 (drawing unit U2) deflected by the stage selection optical element OS2 will be insufficient, and if the target value falls below the intensity (exposure amount) settable range in FIG. Even if the adjustment (correction) is performed, the exposure amount by the beam LB5 (drawing unit U5) deflected by the selection optical element OS5 at the foremost stage is over.
- the variation of the members inside the light source device LS causes deterioration and deterioration of the beam LB.
- the efficiency ⁇ n of each optical element for selection OSn is increased.
- the adjustable range ⁇ Kn of the efficiency ⁇ n of each of the selection optical elements OSn shown in FIG. 7 is shifted downward relative to the target value.
- the adjustable range ⁇ K2 of the efficiency ⁇ 2 of the selection optical element OS2 located at the final stage first reaches the upper limit. No further adjustments can be made.
- the drawing control device 200 or the intensity adjustment control unit 250 sequentially monitors the intensity change of the beam LB emitted from the light source device LS based on the detection signal Sa from the detection circuit CKa shown in FIG.
- the efficiency ⁇ 2 of the selection optical element OS2 located at the last stage among the selection optical elements OSn so that the appropriate exposure amount (target value in FIG. 7) is maintained regardless of the intensity change. It is confirmed whether or not (RF power) can be changed within the adjustable range ⁇ K2.
- the RF power (amplitude) of each of the drive signals DFn is controlled by the intensity adjustment control unit 250 so that the efficiency ⁇ n of all the selection optical elements OSn including the selection optical element OS2 is adjusted. .
- the relationship between the efficiency ⁇ 2 (RF power) in the final selection optical element OS2 and the adjustable range ⁇ K2 is determined by the efficiency ⁇ n and the transmittance ⁇ n of all the selection optical elements OSn. This is because it is assumed that they are the same. As in the first embodiment, the efficiency ⁇ n and the transmittance ⁇ n are measured, and the fluctuation of the efficiency ⁇ n and the variation of the transmittance ⁇ n tend to deviate from the allowable range.
- the selection optical element OSn is specified, the relationship between the efficiency ⁇ n (RF power) in the selection optical element OSn and the adjustable range ⁇ Kn is confirmed, and the intensity of the beam LBn by each of the drawing units Un is matched. Adjust it.
- the beam LB is generated by each of the plurality of selection optical elements (acousto-optic modulation elements) OSn provided so that the beams LB emitted from the light source device LS are sequentially passed.
- the adjustable range of each efficiency (change in beam intensity) of the optical element for selection OSn Since each intensity of the beam LBn supplied to each of the drawing units Un is adjusted under ⁇ Kn, the pattern drawn by each of the drawing units Un has the same exposure amount (for example, within an allowable range of ⁇ 2%). Exposed. For this reason, the uniformity of the line width at the joint portion of the pattern exposed in each of the drawing units Un is maintained.
- each drawing unit Un It was determined whether or not the pattern drawing was aligned so as to have an appropriate exposure amount.
- the efficiency ⁇ n of each of the selection optical elements OSn is relatively different, just pay attention to the adjustable range ⁇ K2 of the efficiency ⁇ 2 (RF power) of the last-stage selection optical element OS2 as shown in FIG.
- the designated appropriate exposure amount target value of the intensity of the beam LBn
- the adjustable range ⁇ Kn of the efficiency ⁇ n of all the optical elements for selection OSn it is necessary to grasp the state of variation of the efficiency ⁇ n of each of the selection optical elements OSn at an appropriate time interval and reset the adjustable range ⁇ Kn. Therefore, in this embodiment, the variation of the efficiency ⁇ n of each optical element for selection OSn is measured using the detection signals Sa and Sb from the photoelectric sensors DTa and DTb shown in FIG.
- FIG. 8 shows that among the six selection optical elements OS1 to OS6 arranged in series along the traveling direction of the beam LB from the light source device LS, the third selection optical element OS3 is turned on, and the other 5 It is a figure which shows typically the generation
- the optical element for selection OS3 since the optical element for selection OS3 is in the ON state, the beam LB3z as the zero-order light traveling in the non-deflected state by the optical element for selection OS3 is received by the photoelectric sensor DTb and output as the detection signal Sb. Is done.
- Ea is the intensity of the detection signal Sa corresponding to the intensity of the beam LB received by the photoelectric sensor DTa, and light is received by the photoelectric sensor DTb when all the selection optical elements OSn (OS1 to OS6) are in the OFF state.
- the intensity of the detection signal Sb corresponding to the intensity of the 0th-order light of the beam LB is Eb0
- the intensity Eb0 is expressed by the following equation 1 by the transmittance ⁇ n.
- Eb0 ⁇ 5 ⁇ ⁇ 6 ⁇ ⁇ 3 ⁇ ⁇ 4 ⁇ ⁇ 1 ⁇ ⁇ 2 ⁇
- the product of the six transmittances ⁇ 1 to ⁇ 6 is K ⁇ .
- the drawing control apparatus 200 uses the beam LB when all the selection optical elements OSn are in an off state, that is, during a period when all the drawing units Un do not perform pattern drawing. Causes the light source device LS to emit light for a short time so that each of the optical elements OSn for selection passes through.
- the intensity Eb5 of the detection signal Sb corresponding to the intensity of the 0th-order light received by the photoelectric sensor DTb when only the foremost selection optical element OS5 is in the ON state is the value of the selection optical element OS5.
- Eb6 and Eb3 of the detection signals Sb corresponding to the intensities of the zeroth order light received by the photoelectric sensor DTb when the selection optical elements OS6, OS3, OS4, OS1, and OS2 are sequentially turned on.
- Eb4, Eb1, and Eb2 are represented by the following formulas 3 to 7, respectively.
- Eb6 K ⁇ (1- ⁇ 6) Ea (3)
- Eb3 K ⁇ (1- ⁇ 3)
- Eb4 K ⁇ (1- ⁇ 4) Ea (5)
- Eb1 K ⁇ (1- ⁇ 1) Ea (6)
- Eb2 K ⁇ (1- ⁇ 2) Ea (7)
- the intensity adjustment control section 250 having the function of the beam intensity measurement section, the intensity Ea corresponding to the beam LB received by the photoelectric sensor DTa, and the zero-order light received by the photoelectric sensor DTb.
- the efficiency ⁇ n of each of the optical elements for selection OSn at the time of measurement is obtained by the following Expression 8.
- ⁇ n 1 ⁇ (Ebn / Eb0) (8)
- the measured values of the signals measured by the photoelectric sensors DTa, DTb, and DT1 to DT6 are preliminarily set so as to accurately correspond to the absolute value of the intensity of the received beam. It is assumed that it has been calibrated.
- the efficiency ⁇ n of each of the six selection optical elements OSn is set as described above.
- the intensity adjustment control unit 250 shown in FIG. 5 can adjust the drive signal DFn of the selection optical element OSn corresponding to the drawing unit Un so that the variation is corrected.
- the zero-order beam of the beam LB that passes through the six selection optical elements OS1 to OS6.
- the current efficiency ⁇ 1 to ⁇ 6 and the variation of each of the selection optical elements OS1 to OS6 can be easily measured. Therefore, the efficiency ⁇ n varies depending on the refractive index variation due to the thermal influence of each of the selection optical elements OS1 to OS6 and the slight inclination of the beam optical path due to the variation of other optical elements (condenser lens and collimator lens).
- the selected optical element OSn can be specified. Further, the adjustable range ⁇ Kn shown in FIG. 7 for correcting the intensity of the beam LBn can be confirmed and reset from the measured variation in the efficiency ⁇ n.
- the selection optical elements OS1 to OS6 are used. Since the transmittances ⁇ 1 to ⁇ 6 of the OS 6 and their fluctuations can be easily measured, the pattern drawn by each of the drawing units U1 to U6 can be accurately maintained and exposed at an appropriate exposure amount. Further, according to the present embodiment, even if the intensity Ea of the beam LB from the light source device LS measured by the photoelectric sensor DTa changes, the efficiency ⁇ n and the transmittance ⁇ n of each optical element OSn for selection are obtained.
- the intensity of the beam LBn supplied to each of the drawing units Un can be adjusted by the drawing control device 200 or the intensity adjustment control unit 250. It is possible to calculate (measure) with high accuracy.
- each of the plurality of selection optical elements OSn is an acousto-optic modulation element (AOM), and the beam LBn is deflected to each of the drawing units Un by the diffraction effect.
- the beam LBn may be deflected using a splitter (polarization separation element).
- the electro-optic element has a chemical composition of KDP (KH 2 PO 4 ), ADP (NH 4 H 2 PO 4 ), KD * P (KD 2 PO 4 ), KDA (KH 2 AsO 4 ), BaTiO 3 , SrTiO 3. , LiNbO 3 , LiTaO 3 and the like.
- the electro-optic element rotates the polarization direction of an incident linearly polarized beam by 90 ° with the refractive index changed by an applied electric field. Therefore, when the beam emitted from the electro-optic element is incident on the deflecting beam splitter, it can be switched at high speed between a state of reflecting toward the drawing unit Un and a state of non-deflecting transmission according to the polarization direction. In the case of this modification, when the beam from the electro-optical element is reflected toward the drawing unit Un by the deflecting beam splitter, the leakage light transmitted through the deflecting beam splitter is transmitted to each of the selection optical elements OSn in the subsequent stage.
- the polarization direction of the linearly polarized beam incident on the electro-optic element is not exactly rotated by 90 degrees with the electro-optic element, but is intentionally slightly shifted from 90 degrees.
- the electric field to be applied may be set.
- the switching selection optical element OSn that selectively supplies the beam LB from the light source device LS to any one of the plurality of drawing units Un is provided in the drawing unit Un.
- the switching function and the intensity adjusting function may be realized by separate optical members.
- the selection optical element OSn of the above embodiment may be used only for switching, and may be a polarization adjustment member that controls the polarization state of the beam LBn and corrects the beam intensity separately for intensity adjustment.
- an electro-optical element an element that changes the polarization direction by the Pockels effect or Kerr effect whose refractive index changes by an electric field
- receives a linearly polarized beam and polarization in a predetermined direction from the beam emitted from the electro-optical element
- a combination with a polarizing plate that transmits the component can be used.
- Such a polarization adjusting member may be provided inside each drawing unit Un, or only one may be provided between the light source device LS and the foremost selection optical element OS5.
- the beam LB from one light source device LS is selectively supplied to any one of the six drawing units U1 to U6.
- the scanning efficiency of the polygon mirror PM is 1
- two light source devices LS are provided, and a beam LB from one light source device LS is selectively supplied to any one of, for example, three odd-numbered drawing units U1, U3, and U5.
- the beam LB from the other light source device LS may be controlled to be selectively supplied to any one of the even-numbered three drawing units U2, U4, U6.
- the number of drawing units that supply the beam LB from one light source device LS by switching in a time division manner is not limited to six or three, and may be two or more.
- the drawing unit of each embodiment performs beam scanning using the rotating polygon mirror PM.
- the galvanometer mirror scanning member
- the galvanometer mirror that reciprocally vibrates around the rotation axis APx within a certain angular range. May be used to scan the beam LBn incident on the f ⁇ lens system FT.
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Abstract
Description
図1は、第1の実施の形態の基板(被照射体)Pに露光処理を施すパターン描画装置(以下、露光装置とも呼ぶ)EXの概略構成を示す斜視図である。なお、以下の説明においては、特に断わりのない限り、重力方向をZ方向とするXYZ直交座標系を設定し、図に示す矢印にしたがって、X方向、Y方向、およびZ方向を説明する。
Vsp=(8・α・VR・LT)/60〔mm/秒〕
したがって、発振周波数Fa(周期Tf)と回転速度VR(rpm)とは、以下の関係になるように設定される。
(φ/2)/Tf=(8・α・VR・LT)/60 ・・・ 式A
上記の実施の形態では、選択用光学素子OSnのうちで特に最終段に位置する選択用光学素子OS2での効率β2(RF電力)の調整可能範囲ΔK2に注目して、描画ユニットUnの各々によるパターン描画が適正露光量になるように揃えられるか否かを判断した。しかしながら、選択用光学素子OSnの各々の効率βnが比較的に大きく異なる場合、図7のように、最終段の選択用光学素子OS2の効率β2(RF電力)の調整可能範囲ΔK2に注目するだけでなく、全ての選択用光学素子OSnの効率βnの調整可能範囲ΔKnから、指定された適正露光量(ビームLBnの強度の目標値)が得られるか否かを判定することが望ましい。その為には、選択用光学素子OSnの各々の効率βnの変動の状態を適当な時間間隔で把握し、調整可能範囲ΔKnを設定し直す必要がある。そこで、本実施の形態では、図4に示した光電センサDTa、DTbの各々からの検出信号Sa、Sbを利用して、選択用光学素子OSnの各々の効率βnの変動を計測する。
Eb0=ε5・ε6・ε3・ε4・ε1・ε2・Ea ・・・(1)
ここで、6つの透過率ε1~ε6の積をKεとする。なお、強度Eaと強度Eb0を取得するために、描画制御装置200は、全ての選択用光学素子OSnがオフ状態のとき、すなわち全ての描画ユニットUnがパターン描画を行わない期間中に、ビームLBが選択用光学素子OSnの各々を通すように光源装置LSを短時間だけパルス発光させる。
Eb5=Kε(1-β5)Ea ・・・(2)
Eb6=Kε(1-β6)Ea ・・・(3)
Eb3=Kε(1-β3)Ea ・・・(4)
Eb4=Kε(1-β4)Ea ・・・(5)
Eb1=Kε(1-β1)Ea ・・・(6)
Eb2=Kε(1-β2)Ea ・・・(7)
βn=1-(Ebn/Eb0) ・・・(8)
ε5=Es5/(β5・Ea) ・・・(9)
となる。
ε6=Es6/(ε5・β6・Ea) ・・・(10)
となる。
ε6=(β5・Es6)/(β6・Es5) ・・・(11)
となる。
ε3=Es3/(ε6・ε5・β3・Ea) ・・・(12)
となる。
ε3=(β6・Es3)/(β3・Es6) ・・・(13)
となる。
Es4=ε4・ε3・ε5・ε6・β4・Ea、
Es1=ε1・ε4・ε3・ε5・ε6・β1・Ea、
Es2=ε2・ε1・ε4・ε3・ε5・ε6・β2・Ea、
の関係から、
ε4=(β3・Es4)/(β4・Es3) ・・・(14)
ε1=(β4・Es1)/(β1・Es4) ・・・(15)
ε2=(β1・Es2)/(β2・Es1) ・・・(16)
となる。
上記の各実施の形態では、複数の選択用光学素子OSnの各々を音響光学変調素子(AOM)として、回折効果によって描画ユニットUnの各々にビームLBnを偏向させたが、電気光学素子と偏光ビームスプリッタ(偏光分離素子)を用いて、ビームLBnを偏向させても良い。電気光学素子は、化学組成として、KDP(KH2PO4)、ADP(NH4H2PO4)、KD*P(KD2PO4)、KDA(KH2AsO4)、BaTiO3、SrTiO3、LiNbO3、LiTaO3等で表される材料である。電気光学素子は、印加される電界によって屈折率が変化して入射する直線偏光のビームの偏光方向を90°回転させるものである。そのため、電気光学素子から射出するビームを偏向ビームスプリッタに入射させると、偏光方向に応じて描画ユニットUnに向かって反射する状態と、非偏向で透過する状態とに高速に切換えることができる。本変形例の場合、偏向ビームスプリッタによって電気光学素子からのビームを描画ユニットUnに向けて反射させている状態のとき、偏向ビームスプリッタを透過する漏れ光は、後段の選択用光学素子OSnの各々の電気光学素子と偏光ビームスプリッタとを透過するので、図4に示したような光電センサDTbによって同様に検出できる。但し、その漏れ光の強度を確保する為に、電気光学素子に入射する直線偏光のビームの偏光方向を電気光学素子で正確に90°回転させるのではなく、90°から意図的にわずかにずれるように、印加する電界を設定すると良い。
上記の各実施の形態では、光源装置LSからのビームLBを複数の描画ユニットUnの各々のうちのいずれか1つに選択的に供給するスイッチング用の選択用光学素子OSnを、描画ユニットUnの各々に向かうビームLBnの強度調整用に兼用したが、スイッチングの機能と強度調整の機能とを別々の光学部材で実現しても良い。例えば、上記の実施の形態の選択用光学素子OSnはスイッチング用のみに用い、強度調整には別にビームLBnの偏光状態を制御してビーム強度を補正する偏光調整部材としても良い。偏光調整部材としては、直線偏光のビームを入射する電気光学素子(電界によって屈折率が変化するポッケルス効果やカー効果によって偏光方向を変える素子)と、電気光学素子を射出したビームから所定方向の偏光成分を透過する偏光板等とを組み合わせたものが使える。このような偏光調整部材は、描画ユニットUnの各々の内部に設けても良いし、光源装置LSと最前段の選択用光学素子OS5との間に1つだけ設けても良い。
また、個別に強度調整部材を設ける場合、スイッチング用の選択用光学素子OSnの各々の効率βnや透過率εnの変動が緩やかであれば、図2の描画ユニットUn内の反射ミラーM20と反射ミラーM20aの間に設けられる不図示のビームエクスパンダで拡大されたビームLBnの光路中に、透過率が徐々に変化するように濃度分布を与えたガラス板(可変NDフィルタ)を設け、そのガラス板上でのビームLBnの透過位置がずれるようにガラス板を移動させて強度調整しても良い。
以上の各実施の形態では、1つの光源装置LSからのビームLBを6つの描画ユニットU1~U6のうちのいずれか1つに選択的に供給する構成としたが、ポリゴンミラーPMの走査効率1/αによっては、光源装置LSを2台にし、一方の光源装置LSからのビームLBは、例えば奇数番の3つの描画ユニットU1、U3、U5のいずれか1つに選択的に供給するように制御し、他方の光源装置LSからのビームLBは、偶数番の3つの描画ユニットU2、U4、U6のいずれか1つに選択的に供給するように制御しても良い。また、1台の光源装置LSからのビームLBを時分割で切換えて供給する描画ユニットは6つ、3つに限られず、2つ以上であれば良い。また、各実施の形態の描画ユニットは、回転するポリゴンミラーPMを用いてビーム走査を行ったが、その代わりに、回転軸APxの回りに一定の角度範囲で往復振動するガルバノミラー(走査部材)を用いて、fθレンズ系FTに入射するビームLBnを走査しても良い。
Claims (20)
- 光源装置からのビームを走査部材によって基板上で走査してパターンを描画する複数の描画ユニットによって、前記基板上にパターンを描画するパターン描画装置であって、
前記光源装置からのビームを前記複数の描画ユニットのいずれか1つに選択的に供給するために、前記光源装置からのビームを順番に通すように配置され、電気的な制御によって前記ビームを前記描画ユニットに向ける複数の選択用光学部材を有するビーム切換部と、
前記複数の描画ユニットのうちの特定の描画ユニットから前記基板に投射されるビームの強度を調整する際、前記特定の描画ユニットに対応したビーム強度調整部の調整可能な範囲内で前記基板に投射されるビームの強度を調整し、前記特定の描画ユニット以外の他の描画ユニットの各々から前記基板に投射されるビームの強度を、前記特定の描画ユニットから前記基板に投射されるビームの強度と揃えるように、前記他の描画ユニットの各々対応した前記ビーム強度調整部を制御する制御部と、
を備える、パターン描画装置。 - 請求項1に記載のパターン描画装置であって、
前記選択用光学部材は、回折作用によって前記光源装置からのビームを前記描画ユニットに向けて偏向する音響光学変調素子である、パターン描画装置。 - 請求項2に記載のパターン描画装置であって、
前記ビーム強度調整部は、前記選択用光学部材としての前記音響光学変調素子の効率を調整するように、前記音響光学変調素子の駆動信号を調整するドライブ回路を含む、パターン描画装置。 - 請求項3に記載のパターン描画装置であって、
前記制御部は、前記複数の選択用光学部材の各々を構成する前記音響光学変調素子の効率の調整可能範囲を比較して、前記複数の描画ユニットの各々から前記基板に投射されるビームの各強度が揃うように調整する、パターン描画装置。 - 請求項4に記載のパターン描画装置であって、
前記制御部は、前記複数の選択用光学部材の各々を構成する前記音響光学変調素子の効率を計測するために、前記音響光学変調素子の複数を透過してくる前記光源装置からのビームの0次光の強度を検出する光電センサからの信号を用いる、パターン描画装置。 - 請求項1に記載のパターン描画装置であって、
前記選択用光学部材は、屈折率の変化によって前記光源装置からのビームの偏光状態を変える電気光学素子と、偏光状態によって前記ビームを前記描画ユニットに向けて偏向する偏光分離素子とで構成される、パターン描画装置。 - 光源装置からのビームを走査部材によって基板上で走査してパターンを描画する複数の描画ユニットによって、前記基板上にパターンを描画するパターン描画装置であって、
前記光源装置からのビームを前記複数の描画ユニットのいずれか1つに選択的に供給するために、前記光源装置からのビームを順番に通すように配置され、電気的な制御によって前記ビームを前記描画ユニットに向ける複数の選択用光学部材を有するビーム切換部と、
前記複数の描画ユニットの各々に対応して設けられ、前記基板に投射されるビームの強度を所定の範囲で調整可能な複数のビーム強度調整部と、
前記複数の選択用光学部材のうち、前記光源装置からの前記ビームを最後に入射する前記選択用光学部材で選択されて前記描画ユニットを介して前記基板に投射されるビームの強度の調整可能な範囲に基づいて、前記複数の描画ユニットの各々から前記基板に投射されるビームの強度を揃えるように前記複数のビーム強度調整部を制御する制御部と、
を備える、パターン描画装置。 - 請求項7に記載のパターン描画装置であって、
前記選択用光学部材は、回折作用によって前記光源装置からのビームを前記描画ユニットに向けて偏向する音響光学変調素子である、パターン描画装置。 - 請求項8に記載のパターン描画装置であって、
前記ビーム強度調整部は、前記選択用光学部材としての前記音響光学変調素子の効率を調整するように、前記音響光学変調素子の駆動信号を調整するドライブ回路を含む、パターン描画装置。 - 請求項9に記載のパターン描画装置であって、
前記制御部は、前記複数の選択用光学部材の各々を構成する前記音響光学変調素子の効率の調整可能範囲を比較して、前記複数の描画ユニットの各々から前記基板に投射されるビームの各強度が揃うように調整する、パターン描画装置。 - 請求項10に記載のパターン描画装置であって、
前記制御部は、前記複数の選択用光学部材の各々を構成する前記音響光学変調素子の効率を計測するために、前記音響光学変調素子の複数を透過してくる前記光源装置からのビームの0次光の強度を検出する光電センサからの信号を用いる、パターン描画装置。 - 請求項7に記載のパターン描画装置であって、
前記選択用光学部材は、屈折率の変化によって前記光源装置からのビームの偏光状態を変える電気光学素子と、偏光状態によって前記ビームを前記描画ユニットに向けて偏向する偏光分離素子とで構成される、パターン描画装置。 - 走査部材で光源装置からのビームを基板上で走査してパターンを描画する複数の描画ユニットによって、前記基板にパターンを描画するパターン描画装置であって、
前記光源装置からのビームを前記描画ユニットに向けて偏向する為の電気光学的な選択用光学部材が前記複数の描画ユニットの各々に対応して設けられ、前記光源装置からのビームを複数の前記選択用光学部材の各々に順番に通すように導光する複数の光学素子を有するビーム切換部と、
前記光源装置からのビームを前記複数の描画ユニットのうちの1つに選択的に供給するように、前記複数の選択用光学部材のうちの1つに偏向の為の駆動信号を与える切換え制御部と、
前記複数の選択用光学部材のうちの前記駆動信号が与えられた前記選択用光学部材を透過した非偏向状態のビームの強度を検出して、前記複数の描画ユニットの各々に供給される前記ビームの強度を計測するビーム強度計測部と、
を備える、パターン描画装置。 - 請求項13に記載のパターン描画装置であって、
前記選択用光学部材は、前記光源装置からのビームを、前記駆動信号に応答して前記描画ユニットに向かうように偏向するビームと共に、前記非偏向状態のビームを生成する音響光学変調素子である、パターン描画装置。 - 請求項13に記載のパターン描画装置であって、
前記選択用光学部材は、前記光源装置からのビームを、前記駆動信号に応答して前記描画ユニットに向かうように偏向するビームと共に、前記非偏向状態のビームを生成する電気光学素子を含む、パターン描画装置。 - 走査部材で光源装置からのビームを基板上で走査してパターンを描画する複数の描画ユニットによって、前記基板にパターンを描画するパターン描画装置であって、
前記光源装置からのビームを前記描画ユニットに向けて偏向する為の音響光学変調素子が前記複数の描画ユニットの各々に対応して設けられ、前記光源装置からのビームを複数の前記音響光学変調素子の各々に順番に通すように導光する複数の光学素子を有するビーム切換部と、
前記光源装置からのビームを前記複数の描画ユニットのうちの1つに順番に供給するように、前記複数の音響光学変調素子のうちの1つを偏向状態に切り換える制御部と、
前記複数の音響光学変調素子のうちの偏向状態になっている前記音響光学変調素子を透過した非偏向状態のビームの強度を検出して、前記複数の描画ユニットの各々に供給される前記ビームの強度を計測するビーム強度計測部と、
を備える、パターン描画装置。 - 請求項16に記載のパターン描画装置であって、
前記ビーム強度計測部は、前記複数の音響光学変調素子のうちの最前段の音響光学変調素子に入射する前記光源装置からのビームの強度を検出する第1の光電センサと、
前記複数の音響光学変調素子の各々を通った前記非偏向状態のビームの強度を検出する第2の光電センサと、
を備える、パターン描画装置。 - 請求項17に記載のパターン描画装置であって、
前記ビーム強度計測部は、前記制御部によって前記複数の音響光学変調素子のうちの1つが偏向状態に切り換えられるたびに前記第1の光電センサと前記第2の光電センサから出力される光電信号に基づいて、前記複数の音響光学変調素子の各々の効率に関する情報を演算する、パターン描画装置。 - 請求項18に記載のパターン描画装置であって、
前記ビーム強度計測部は、前記複数の音響光学変調素子の各々で偏向されて前記描画ユニットの各々に供給される前記ビームをそれぞれ受光するように設けられた複数の第3の光電センサを備える、パターン描画装置。 - 請求項19に記載のパターン描画装置であって、
前記ビーム強度計測部は、前記第2の光電センサと前記複数の第3の光電センサの各々から出力される光電信号と、前記複数の音響光学変調素子の各々の効率に関する情報とに基づいて、前記複数の音響光学変調素子の透過率に関する情報を演算する、パターン描画装置。
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56123521A (en) * | 1980-03-05 | 1981-09-28 | Ricoh Co Ltd | Optical scanner |
JPH10226099A (ja) * | 1997-02-12 | 1998-08-25 | Fuji Xerox Co Ltd | 画像形成装置 |
JPH11109273A (ja) * | 1997-09-29 | 1999-04-23 | Asahi Optical Co Ltd | 光量検出調節機能を持つレーザ描画装置 |
JP2003337427A (ja) * | 2002-05-20 | 2003-11-28 | Fuji Photo Film Co Ltd | 露光装置 |
JP2008181103A (ja) * | 2006-12-25 | 2008-08-07 | Canon Inc | 光走査装置及びそれを備えた画像形成装置 |
JP2014115626A (ja) * | 2012-11-19 | 2014-06-26 | Ricoh Co Ltd | 光走査装置及び画像形成装置 |
WO2015166910A1 (ja) * | 2014-04-28 | 2015-11-05 | 株式会社ニコン | パターン描画装置、パターン描画方法、デバイス製造方法、レーザ光源装置、ビーム走査装置、および、ビーム走査方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0888161A (ja) * | 1994-09-19 | 1996-04-02 | Mitsubishi Heavy Ind Ltd | 描画装置 |
DE19829986C1 (de) * | 1998-07-04 | 2000-03-30 | Lis Laser Imaging Systems Gmbh | Verfahren zur Direktbelichtung von Leiterplattensubstraten |
JP3975478B2 (ja) | 2001-07-17 | 2007-09-12 | セイコーエプソン株式会社 | パターン描画装置 |
US7450274B2 (en) * | 2003-05-07 | 2008-11-11 | Ricoh Company, Ltd. | Optical scanning apparatus, image forming apparatus, and beam positioning method |
-
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Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56123521A (en) * | 1980-03-05 | 1981-09-28 | Ricoh Co Ltd | Optical scanner |
JPH10226099A (ja) * | 1997-02-12 | 1998-08-25 | Fuji Xerox Co Ltd | 画像形成装置 |
JPH11109273A (ja) * | 1997-09-29 | 1999-04-23 | Asahi Optical Co Ltd | 光量検出調節機能を持つレーザ描画装置 |
JP2003337427A (ja) * | 2002-05-20 | 2003-11-28 | Fuji Photo Film Co Ltd | 露光装置 |
JP2008181103A (ja) * | 2006-12-25 | 2008-08-07 | Canon Inc | 光走査装置及びそれを備えた画像形成装置 |
JP2014115626A (ja) * | 2012-11-19 | 2014-06-26 | Ricoh Co Ltd | 光走査装置及び画像形成装置 |
WO2015166910A1 (ja) * | 2014-04-28 | 2015-11-05 | 株式会社ニコン | パターン描画装置、パターン描画方法、デバイス製造方法、レーザ光源装置、ビーム走査装置、および、ビーム走査方法 |
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