WO2015001736A1 - 露光装置および照明ユニット - Google Patents
露光装置および照明ユニット Download PDFInfo
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- WO2015001736A1 WO2015001736A1 PCT/JP2014/003213 JP2014003213W WO2015001736A1 WO 2015001736 A1 WO2015001736 A1 WO 2015001736A1 JP 2014003213 W JP2014003213 W JP 2014003213W WO 2015001736 A1 WO2015001736 A1 WO 2015001736A1
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- Prior art keywords
- light emitting
- exposure
- light
- array
- emitting element
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70058—Mask illumination systems
- G03F7/7015—Details of optical elements
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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
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/201—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by an oblique exposure; characterised by the use of plural sources; characterised by the rotation of the optical device; characterised by a relative movement of the optical device, the light source, the sensitive system or the mask
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70275—Multiple projection paths, e.g. array of projection systems, microlens projection systems or tandem projection systems
Definitions
- the present invention relates to an exposure apparatus that exposes a substrate by forming an exposure pattern on a mask on a substrate with a microlens array, and an illumination unit that emits exposure light and illuminates the mask during the exposure.
- Patent Document 1 An exposure apparatus that uses a microlens array in which two-dimensionally arranged microlenses are used as an imaging optical system to copy the exposure pattern on the mask onto the substrate has been proposed (Patent Document 1), and is put to practical use in liquid crystal panel manufacturing processes Has been.
- an illumination unit that emits exposure light to illuminate the mask is disposed on a mask on which an exposure pattern is formed, and a microscopic unit is provided between the mask and a substrate coated with a photosensitive resist. Arrange the lens array. Then, while moving the illumination unit and the microlens array relative to the mask and the substrate, the exposure pattern on the mask is imaged on the substrate by the microlens array (see Patent Document 2). . By doing so, it is possible to expose a substrate having a large area that exceeds the exposure area when the microlens array is stationary.
- Patent Document 3 shows a configuration of an illumination unit composed of a light source and an optical system suitable for this type of exposure apparatus.
- a number of high-pressure mercury lamps are two-dimensionally arranged, and light emitted from the number of high-pressure mercury lamps passes through an optical system including a lens and a number of reflecting mirrors. It is structured to illuminate the mask.
- the exposure pattern on the mask can be imaged on the substrate with high resolution, and the mask and the substrate are brought close to, for example, about 10 mm, A low profile is achieved by placing a microlens array between them.
- the illumination unit conventionally, a large number of high-pressure mercury lamps are arranged, an optical system with a large size is required, and the height of the illumination unit itself is, for example, about 2 m. It is a great hindrance to conversion.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide an illumination unit that is reduced in size and height, and an exposure apparatus that is reduced in size and height by adopting the illumination unit.
- the exposure apparatus of the present invention that achieves the above object provides: An illumination unit that emits exposure light; A mask on which an exposure pattern is formed and exposed to exposure light from the illumination unit; A microlens array with a mask as a subject, A moving mechanism for moving the illumination unit and the microlens array relative to both the mask and the substrate on which the exposure pattern on the mask is imaged by the microlens array; Due to the relative movement in the moving direction by the moving mechanism, the substrate is changed to a pattern corresponding to the exposure pattern on the mask over a region on the substrate that extends beyond the exposure region when the microlens array is stationary.
- the microlens array has a plurality of microlenses arranged two-dimensionally including an array in an intersecting direction intersecting the moving direction
- the lighting unit is A light emitting element array in which a plurality of light emitting elements are arranged; A plurality of emitted light beams emitted from a plurality of light emitting elements constituting the light emitting element array spread across a plurality of microlenses arranged in the intersecting direction in the intersecting direction, and adjacent to the moving direction in the moving direction.
- an illumination optical system that converts the exposure light beam to a width that is limited to a size that does not reach the microlenses arranged in a row and guides the exposure light beam onto a plurality of microlenses arranged in the crossing direction.
- a laser diode is typically employed as the light emitting element, and a laser diode array can be employed as the light emitting element array.
- the illumination unit of the present invention employs a light emitting element array, converts a plurality of emitted light beams emitted from the light emitting element array into slit-shaped exposure light beams, and guides them to a plurality of microlenses arranged in the intersecting direction. As a result, a significant reduction in height is realized compared to a conventional lighting unit that employs a number of two-dimensionally arranged mercury lamps.
- the effective aperture of the microlens irradiated with the width of the exposure light beam includes an alignment error and the like. Can be limited to. When the exposure light beam having such a limited width is employed, the ratio of the emitted light used as effective exposure light is increased, and high efficiency and energy saving are also realized.
- the illumination unit includes a plurality of the light emitting element arrays
- the illumination optical system converts, for each light emitting element array, a plurality of light emitted from the light emitting element array into one exposure light beam, and a plurality of exposures corresponding to the plurality of light emitting element arrays.
- the optical system is preferably an optical system that guides each of the light beams to a plurality of rows that are each composed of a plurality of microlenses arranged in the intersecting direction and that are different from each other in the moving direction.
- the amount of exposure light on the substrate can be increased and exposure can be completed in a short exposure time.
- the illumination optical system is A light beam conversion optical system arranged corresponding to the light emitting element array, in which a plurality of emitted light beams emitted from a plurality of light emitting elements constituting the light emitting element array are incident, converted into a slit light beam having a slit shape, and emitted; It is preferable to have a light projecting optical system that receives the slit light beam emitted from the light beam conversion optical system and converts the slit light beam into the exposure light beam.
- a rod lens processed into the shape of the slit light beam can be employed.
- an illumination optical system having the light beam conversion optical system and the projection optical system as described above When an illumination optical system having the light beam conversion optical system and the projection optical system as described above is employed, an exposure light beam with a uniform amount of light in the light beam can be obtained, and exposure with less exposure unevenness can be realized.
- the illumination unit further includes a support substrate made of a material that transmits the emitted light emitted from the light emitting element array, to which the light emitting element array is fixed,
- the illumination optical system is provided corresponding to the light emitting element array, is fixed on the support substrate, extends along the light emitting element array, and reflects a plurality of emitted lights emitted from a plurality of light emitting elements constituting the light emitting element array. It is preferable to have a reflective optical system that transmits the support substrate.
- the reflection optical system a reflection mirror, a reflection prism, or the like can be employed.
- multiple light emitting element arrays can be arranged with high precision, and the optical axis of emitted light can be adjusted with high precision and ease by fine adjustment of the position of the reflective optical system before fixing. Can do.
- the illumination unit includes a support substrate made of a material that transmits the emitted light emitted from the light emitting element array, to which the light emitting element array is fixed, It is also a preferred embodiment that the light emitting element array is fixed on a support substrate in a posture in which a plurality of emitted light beams are emitted from the plurality of light emitting elements constituting the light emitting element array toward the support substrate. .
- a plurality of light emitting element arrays can be arranged with high accuracy.
- the lighting unit of the present invention that achieves the above object is
- the microlens array emits exposure light and moves the microlens array relative to the mask and the substrate in a predetermined movement direction.
- An illumination unit that illuminates the mask while moving relative to the moving direction together with the array,
- the microlens array has a plurality of microlenses arranged two-dimensionally including an array in an intersecting direction intersecting the moving direction,
- This lighting unit A light emitting element array in which a plurality of light emitting elements are arranged;
- a plurality of emitted light beams emitted from a plurality of light emitting elements constituting the light emitting element array spread across a plurality of microlenses arranged in the intersecting direction in the intersecting direction, and adjacent to the moving direction in the moving direction.
- An illumination optical system that converts the exposure light beam into a plurality of microlenses arranged in the cross direction by converting the exposure light beam to a width that is limited to a size that does not reach the microlenses arranged in a row.
- the lighting unit can be significantly reduced in height.
- FIG. 1 It is a conceptual diagram which shows an example of the exposure apparatus which employ
- FIG. 1 is a conceptual diagram showing an example of an exposure apparatus that employs a microlens array.
- An exposure apparatus itself that employs a microlens array is already a well-known technique, and only an outline thereof will be described here.
- the exposure apparatus 1 includes an illumination unit 10, a mask 20, a microlens array 30, and a driving device 40.
- a substrate 50 coated with a photosensitive resist is loaded at a position facing the mask 20 with the microlens array 30 interposed therebetween.
- the illumination unit 10 emits an exposure light beam and illuminates the mask 20 with exposure light from the exposure light beam.
- An exposure pattern (not shown) is formed on the mask 20.
- the microlens array 30 has a plurality of microlenses 31 arranged two-dimensionally, and forms an exposure pattern on the mask 20 on the substrate 50 using the mask 20 as a subject.
- the exposure area at rest by the illumination unit 10 and the microlens array 30 have a smaller area than the mask 20 and the substrate 50. Therefore, the driving device 40 causes the illumination unit 10 and the microlens array 30 to be separated from each other. Move in the direction of arrow A with the relative position between them fixed. Thereby, the board
- the exposure is performed after the exposure is performed over the entire width direction of the substrate 50 as described above.
- the apparatus 40 moves the substrate 50 by one exposure width in the direction perpendicular to the paper surface of FIG. 1, and then moves the illumination unit 10 and the microlens array 30 again to perform exposure. In this way, the entire area to be exposed is exposed even on a large-area substrate.
- the substrate 50 is unloaded from the exposure apparatus 1, the next new substrate 50 is loaded, and the above exposure operation is repeated.
- the movement for the exposure may be a relative movement, and the illumination unit 10 and the microlens array 30 may be fixed and the mask 20 and the substrate 50 may be moved.
- FIG. 2 is a plan view showing a part of a large number of microlenses arranged on the microlens array.
- microlenses 31 are arranged in the microlens array 30 schematically shown in FIG.
- FIG. 2 shows an enlarged view of a very small portion of the microlenses.
- the arrow A shown in FIG. 2 indicates the moving direction of the illumination unit 10 and the microlens array 30 during exposure, like the arrow A shown in FIG.
- the microlenses 31 on the microlens array 30 are two-dimensionally arranged including an array in the direction of arrow aa perpendicular to the moving direction A.
- the direction of arrow aa corresponds to an example of the crossing direction referred to in the present invention.
- a hexagonal field stop 32 is disposed in each microlens 31, thereby limiting the effective aperture of the microlens 31. This is to prevent image distortion and decrease in peripheral light amount due to the use of the peripheral region of the microlens 31.
- the lighting unit 10 that is a feature of the present embodiment will be described.
- a comparative example first, an example of a conventional lighting unit using a mercury lamp will be described, and then the lighting unit of the present embodiment will be described.
- FIG. 3 is a schematic perspective view showing an example of an illumination unit using a mercury lamp.
- the lighting unit shown in FIG. 3 corresponds to a comparative example for the present invention.
- the illumination unit 90 includes a light source 91 and an illumination optical system 92.
- a number of mercury lamps 911 are two-dimensionally arranged in the light source 91.
- the illumination optical system 92 transmits light emitted from a number of mercury lamps 911 constituting the light source 91 via the first mirror 921, the lens 922, the second mirror 923, and the third mirror 924 to the mask 20 (see FIG. 1).
- the structure is guided to a region facing the microlens array 30.
- the width is 2.4 m
- the depth is 4.4 m
- the height is 1.9 m.
- FIG. 4 is a view showing an illumination area on the microlens array by the illumination unit shown in FIG.
- the mask is omitted for the sake of clarity, and the microlens array 30 is shown as being directly illuminated.
- the microlens array 30 has a configuration in which a plurality of unit microlens arrays 301 are arranged. An extremely large number of microlenses (not shown in FIG. 4) are arranged in each unit microlens array 301. Yes.
- the exposure area 93 on the microlens array 30 by the illumination unit 90 shown in FIG. 3 is spread uniformly without considering the positional relationship with the individual microlenses 31.
- the microlenses 31 of the present embodiment are discretely arranged in the movement direction A, and each microlens 31 is used for exposure to the substrate 50.
- the effective area of the exposure light is limited within the field stop 32. For this reason, when the microlens array 30 is uniformly illuminated as shown in FIG. 4, the exposure light that is effectively used for actual exposure becomes a very small part of the illumination, and the utilization efficiency is low.
- FIG. 5 is a diagram showing an outline of the lighting unit 10 of the present embodiment.
- LD array bars laser diode array bars
- LD array bars laser diode array bars
- FIG. 6 is a diagram showing an illumination area on the microlens array by the illumination unit shown in FIG.
- FIG. 6A shows an illumination area of the entire illumination unit shown in FIG. 5, and
- FIG. 6B shows an enlarged illumination area for one illumination optical system.
- the illumination unit 10 includes 12 LD array bars per illumination optical system 100 as described above. Corresponding to these 12 LD array bars, 12 slit-shaped exposure light beams are generated per one illumination optical system 100, and 12 slit-shaped exposure lights 170 are irradiated. This exposure light beam spreads across a large number of microlenses 31 for the microlenses 31 arranged in the direction of the arrow aa shown in FIG. 2, and for the moving direction A, it is arranged in a row adjacent to that direction. The exposure light flux is limited to a size that does not reach the microlens 31.
- the twelve exposure lights 170 by the twelve exposure light beams generated by one illumination optical system 100 are all rows of a plurality of microlenses arranged in the direction of the arrow aa, and the movement direction A is the same. Each of the twelve different rows is illuminated.
- the illumination unit 10 of this embodiment the utilization efficiency as exposure light is improved by avoiding the irradiation to the partial area
- the illumination unit 10 of the present embodiment by adopting an LD (laser diode), the illumination unit is small and low-profile as compared with the case where a mercury lamp is employed.
- FIG. 7 is a schematic diagram showing the configuration of one illumination optical system.
- FIG. 8 is an enlarged view of a circle R shown in FIG.
- FIG. 9 is a diagram showing one LD array bar and light emitted from the LD array bar.
- the LD array bar 110 shown in FIG. 9 has a dimension of about 11 mm in length, and 48 LDs 111 are arranged in a one-dimensional manner, for example, at a pitch of 200 ⁇ m.
- the LD array bar 110 corresponds to an example of a light emitting element array according to the present invention
- the LD 111 arranged on the LD array bar 110 corresponds to an example of a light emitting element according to the present invention.
- each LD 111 constituting the LD array bar 110 is bent downward by a reflecting optical system (prism 121 in this embodiment) such as a mirror or a prism.
- a reflecting optical system such as a mirror or a prism.
- the emitted light bent downward becomes a light beam 171 for each LD 111 as it is.
- FIG. 8 shows a state in which a plurality of (in this embodiment, 12) LD array bars 110 are arranged.
- Each LD array bar 110 is connected to a flexible substrate 112 that connects an LD array driver 113 (see FIG. 7).
- Each LD array bar 110 is driven by the LD array driver 113 via each flexible substrate 112. .
- rod lenses 122 corresponding to the LD array bars 110 are arranged under the LD array bars 110.
- These rod lenses 122 correspond to an example of a light beam conversion optical system referred to in the present invention.
- These rod lenses 122 are processed into a flat plate shape, and light emitted from each LD array bar 110 enters the rod lens 122 from the upper end surface of the corresponding rod lens 122.
- the 48 light beams 171 from the 48 LDs 111 incident on the rod lens 122 are mixed due to refraction due to the refractive index distribution in the rod lens 122 and reflection on the outer wall surface of the rod lens 122, and a uniform light amount distribution is obtained. It is emitted from the lower end surface of the rod lens 122 as a single luminous flux.
- the twelve light beams 172 emitted from the lower end surfaces of a plurality of (in this case, twelve) rod lenses 122 are both incident on one light projecting optical system 123 shown in FIG.
- the light projecting optical system 123 forms a multi-line beam 174 composed of a plurality of (12) exposure light beams 173 that are slit-shaped as shown in FIG. Emanates from.
- the multi-line beam 174 illuminates the microlenses 31 one column at a time by the 12 exposure lights 170 (see FIG. 6) generated by the 12 exposure light beams 173 constituting the multi-line beam 174.
- FIG. 10 is a diagram showing LD array bars arranged on a glass substrate.
- FIG. 10 shows four LD array bars which are a part of the LD array bar for one illumination optical system.
- These LD array bars 110 are arranged on the glass substrate 120 and fixed on the glass substrate 120.
- An arrow A direction shown in FIG. 10 is the same direction as the moving direction A shown in FIG.
- one LD array bar 110 has a length of about 11 mm as an example, and 48 LDs are arranged at a pitch of 200 ⁇ m in an area of 10 mm. Further, a reflecting prism 121 is disposed at a position facing the emission surface of each LD array bar 110. This reflecting prism 121 is also fixed on the glass substrate 120.
- FIG. 11 is a schematic cross-sectional view of a single LD array bar mounting portion on a glass substrate.
- a submount 118 is fixed on the glass substrate 120.
- An Au coating 119 is applied to the upper surface of the submount 118.
- the Au coating 119 is connected to a ground terminal (not shown) on the lower surface of the LD array bar 110.
- the LD array bar 110 is placed so as to be connected to the Au coating 119 on the submount 118 and fixed to the glass substrate 120 through the submount 118.
- the terminals on the upper surface of the LD array bar 110 are connected to the circuit board 114 via the flip chip 115a.
- the Au coating 119 on the submount 118 is also connected to the ground on the circuit board 114 through the flip chip 115b.
- a driver IC 116 for driving the LD array bar 110 is mounted on the circuit board 114.
- the circuit board 114 is connected to the LD array driver 113 shown in FIG. 7 via a flexible board 112 (see also FIG. 8).
- a reflecting prism 121 is disposed on the exit end face side of the LD array bar 110.
- the reflecting prism 121 reflects the light emitted from the LD array bar 110, transmits the light through the glass substrate 120, and enters the flat rod lens 122 shown in FIG.
- FIG. 12 is a diagram showing another arrangement format of the LD array bar on the glass substrate.
- the LD array bar 110 is configured such that light is emitted from a plurality of LDs constituting the LD array bar 110 in a direction parallel to the surface of the glass substrate 120.
- the glass substrate 120 is transmitted by being reflected by the reflecting prism 121.
- the LD array bar 110 emits light from the plurality of LDs constituting the LD array bar 110 to the glass substrate 120 via the submount 118 ′. It is fixed.
- the submount 118 ′ is assembled with the same components as in FIG. 11 except for the reflecting prism 121.
- the submount 118 ′ is erected and fixed to the glass substrate 120 so that the emission surface of the LD array bar 110 faces downward.
- the LD array bars 110 may be arranged on the glass substrate 120 as shown in FIG.
- the dimensions of a width of about 0.9 m, a depth of 0.3 m, and a height of about 0.6 m are sufficient, and the mercury lamp described with reference to FIG. 3 is used. Compared with the conventional lighting unit, the size can be greatly reduced.
- FIG. 13 is a diagram showing an illumination pattern of an illumination area for one illumination optical system.
- the moving direction A shown in FIG. 1 is also indicated by an arrow A in FIG.
- the microlenses 31 on the microlens array 30 are illuminated for each column with a long slit-shaped exposure light 170.
- the exposure light 170 directly illuminates the mask 20 (see FIG. 1) on the microlens array 30, but the mask 20 is not shown.
- FIG. 13A shows a state in which the microlens array 30 is irradiated with a multi-line beam 174 (see FIG. 7) composed of 12 exposure light beams 173.
- FIG. 13B is a diagram showing a state in which every other arrayed LD array bar is driven and emission of emitted light from every other arrayed LD array bar is stopped.
- FIG. 13C shows a state in which only half the number of LD array bars is driven as compared with FIG. 13B.
- FIG. 13D shows, as a comparative example, an illumination area 179 that is the same as the illumination area in charge of one illumination optical system in the present embodiment by the illumination unit 90 shown in FIG.
- the exposure light quantity for exposing the substrate 50 is the same as that in the comparative example (FIG. 13D), the exposure light quantity shown in FIG. This level is sufficient, and power consumption is only about a quarter.
- the amount of exposure light can be increased by driving a larger number of LD array bars as shown in FIG. 13B or FIG.
- the illumination unit is significantly reduced in size, and thus the exposure apparatus is significantly reduced in size, and the power consumption is further reduced.
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Abstract
Description
露光光を出射する照明ユニットと、
露光パターンが形成され照明ユニットからの露光光の照射を受けるマスクと、
マスクを被写体とするマイクロレンズアレイと、
照明ユニットおよびマイクロレンズアレイを、マスクと、マイクロレンズアレイによりマスク上の露光パターンが結像される基板との双方に対し、所定の移動方向に相対移動させる移動機構とを備え、
上記移動機構による上記移動方向への相対移動により、基板上の、マイクロレンズアレイの静止時の露光領域を越えた広がりを持つ領域に渡って、基板を、マスク上の露光パターンに応じたパターンに露光する露光装置において、
上記マイクロレンズアレイが、上記移動方向に交差する交差方向への配列を含んで2次元的に配置された複数のマイクロレンズを有し、
上記照明ユニットが、
複数の発光素子が配列された発光素子アレイと、
発光素子アレイを構成する複数の発光素子から出射した複数の発光光を、上記交差方向についてはその交差方向に並ぶマイクロレンズ複数個に跨って広がるとともに、上記移動方向についてはその移動方向に隣接する列に並ぶマイクロレンズに及ばない広さに制限された露光光束に変換して、その露光光束を交差方向に並ぶ複数のマイクロレンズ上に導く照明光学系とを有することを特徴とする。
上記照明ユニットが、上記発光素子アレイを複数本備え、
上記照明光学系が、発光素子アレイ一本毎に、その一本の発光素子アレイから出射した複数の発光光を露光光束一本に変換して、発光素子アレイ複数本に対応する複数本の露光光束それぞれを、いずれもが上記交差方向に並ぶ複数のマイクロレンズからなる列であって移動方向について互いに異なる複数の列それぞれに導く光学系であることが好ましい。
上記照明光学系が、
発光素子アレイを構成する複数の発光素子から出射した複数の発光光が入射しスリット形状を有するスリット光束に変換して出射する、発光素子アレイに対応して配置された光束変換光学系と、
光束変換光学系から出射したスリット光束が入射しそのスリット光束を上記露光光束に変換する投光光学系とを有することが好ましい。
上記照明光学系が、発光素子アレイに対応して備えられ支持基板上に固定されて発光素子アレイに沿って延び、発光素子アレイを構成する複数の発光素子から出射した複数の発光光を反射して支持基板を透過させる反射光学系を有することが好ましい。
上記発光素子アレイが、支持基板上に、その該発光素子アレイを構成する複数の発光素子から支持基板に向かって複数の発光光が出射される姿勢に、固定されていることも好ましい形態である。
露光パターンが形成されたマスク上の露光パターンをマイクロレンズアレイで基板上に結像させて、マイクロレンズアレイをマスクおよび基板に対し所定の移動方向に相対移動させるにあたり、露光光を出射しマイクロレンズアレイとともに上記移動方向に相対移動しながらマスクを照明する照明ユニットであって、
上記マイクロレンズアレイが、上記移動方向に交差する交差方向への配列を含んで2次元的に配置された複数のマイクロレンズを有し、
この照明ユニットが、
複数の発光素子が配列された発光素子アレイと、
発光素子アレイを構成する複数の発光素子から出射した複数の発光光を、上記交差方向についてはその交差方向に並ぶマイクロレンズ複数個に跨って広がるとともに、上記移動方向についてはその移動方向に隣接する列に並ぶマイクロレンズに及ばない広さに制限された露光光束に変換して露光光束を交差方向に並ぶ複数のマイクロレンズ上に導く照明光学系とを有することを特徴とする。
10,90 照明ユニット
20 マスク
30 マイクロレンズアレイ
31 マイクロレンズ
32 視野絞り
40 駆動装置
50 基板
91 光源
92,100 照明光学系
93 露光領域
111 LD
112 フレキシブル基板
113 LDアレイドライバー
114 回路基板
115a,115b フリップチップ
116 ドライバIC
117,171 反射プリズム
118,118’ サブマウント
119 Auコーティング
120 ガラス基板
121 反射プリズム
122 ロッドレンズ
123 投光光学系
170 露光光
171,172 光束
173 露光光束
174 マルチラインビーム
301 単位マイクロレンズアレイ
911 水銀ランプ
921 第1ミラー
922 レンズ
923 第2ミラー
924 第3ミラー
Claims (6)
- 露光光を出射する照明ユニットと、
露光パターンが形成され前記照明ユニットからの露光光の照射を受けるマスクと、
前記マスクを被写体とするマイクロレンズアレイと、
前記照明ユニットおよび前記マイクロレンズアレイを、前記マスクと、該マイクロレンズアレイにより該マスク上の露光パターンが結像される基板との双方に対し、所定の移動方向に相対移動させる移動機構とを備え、
前記移動機構による前記移動方向への相対移動により、前記基板上の、前記マイクロレンズアレイの静止時の露光領域を越えた広がりを持つ領域に渡って、該基板を、前記マスク上の露光パターンに応じたパターンに露光する露光装置において、
前記マイクロレンズアレイが、前記移動方向に交差する交差方向への配列を含んで2次元的に配置された複数のマイクロレンズを有し、
前記照明ユニットが、
複数の発光素子が配列された発光素子アレイと、
前記発光素子アレイを構成する複数の発光素子から出射した複数の発光光を、前記交差方向については該交差方向に並ぶマイクロレンズ複数個に跨って広がるとともに、前記移動方向については該移動方向に隣接する列に並ぶマイクロレンズに及ばない広さに制限された露光光束に変換して、該露光光束を該交差方向に並ぶ複数のマイクロレンズ上に導く照明光学系とを有することを特徴とする露光装置。 - 前記照明ユニットが、前記発光素子アレイを複数本備え、
前記照明光学系が、前記発光素子アレイ一本毎に、該一本の発光素子アレイから出射した複数の発光光を前記露光光束一本に変換して、該発光素子アレイ複数本に対応する複数本の露光光束それぞれを、いずれもが前記交差方向に並ぶ複数のマイクロレンズからなる列であって前記移動方向について互いに異なる複数の列それぞれに導く光学系であることを特徴とする請求項1記載の露光装置。 - 前記照明光学系が、
前記発光素子アレイを構成する複数の発光素子から出射した複数の発光光が入射しスリット形状を有するスリット光束に変換して出射する、該発光素子アレイに対応して配置された光束変換光学系と、
前記光束変換光学系から出射した前記スリット光束が入射し該スリット光束を前記露光光束に変換する投光光学系とを有することを特徴とする請求項1又は2記載の露光装置。 - 前記照明ユニットがさらに、前記発光素子アレイが固定される、該発光素子アレイから出射した発光光を透過する材質からなる支持基板を備え、
前記照明光学系が、前記発光素子アレイに対応して備えられ前記支持基板上に固定されて該発光素子アレイに沿って延び、該発光素子アレイを構成する複数の発光素子から出射した複数の発光光を反射して該支持基板を透過させる反射光学系を有することを特徴とする請求項1から3のうちいずれか1項記載の露光装置。 - 前記照明ユニットがさらに、前記発光素子アレイが固定される、該発光素子アレイから出射した発光光を透過する材質からなる支持基板を備え、
前記発光素子アレイが、前記支持基板上に、該発光素子アレイを構成する複数の発光素子から該支持基盤に向かって複数の発光光が出射される姿勢に、固定されていることを特徴とする請求項1から3のうちいずれか1項記載の露光装置。 - 露光パターンが形成されたマスク上の該露光パターンをマイクロレンズアレイで基板上に結像させて、該マイクロレンズアレイを該マスクおよび該基板に対し所定の移動方向に相対移動させるにあたり、露光光を出射し該マイクロレンズアレイとともに該移動方向に相対移動しながら該マスクを照明する照明ユニットであって、
前記マイクロレンズアレイが、前記移動方向に交差する交差方向への配列を含んで2次元的に配置された複数のマイクロレンズを有し、
当該照明ユニットが、
複数の発光素子が配列された発光素子アレイと、
前記発光素子アレイを構成する複数の発光素子から出射した複数の発光光を、前記交差方向については該交差方向に並ぶマイクロレンズ複数個に跨って広がるとともに、前記移動方向については該移動方向に隣接する列に並ぶマイクロレンズに及ばない広さに制限された露光光束に変換して、該露光光束を該交差方向に並ぶ複数のマイクロレンズ上に導く照明光学系とを有することを特徴とする照明ユニット。
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US9921482B2 (en) | 2018-03-20 |
KR20160026830A (ko) | 2016-03-09 |
JP6283798B2 (ja) | 2018-02-28 |
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TW201502718A (zh) | 2015-01-16 |
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