JP4942617B2 - Scan exposure equipment - Google Patents

Description

  The present invention relates to a scan exposure apparatus, for example, a scan exposure apparatus suitable for exposing and transferring a mask pattern onto a substrate of a large flat panel display such as a liquid crystal display or a plasma display.

Large flat panel displays such as liquid crystal displays and plasma displays used in large thin televisions and the like are manufactured by proximity exposure transfer of a mask pattern onto a substrate by a divided sequential exposure method. As a conventional sequential sequential exposure apparatus of this type, for example, a mask smaller than the substrate as the material to be exposed is used. In this state, the work stage is moved stepwise with respect to the mask, and the substrate is exposed to light for pattern exposure from the mask side at each step, thereby exposing a plurality of mask patterns drawn on the mask onto the substrate. There is known one in which a plurality of displays and the like are created on a single substrate by transfer. Patent Document 1 discloses a scan exposure method in which exposure light is irradiated through a mask onto a substrate transported at a constant speed, and a mask pattern is exposed and transferred onto the substrate.
JP 2006-292955 A

  By the way, in a scan exposure method in which exposure is performed while transporting a substrate, when a plurality of panels are cut out from the substrate, a non-exposure region in which exposure light is not irradiated is formed in a corresponding region between adjacent panels. Therefore, it is conceivable that a light shielding member is provided between the irradiation unit and the substrate so as to cover the non-exposed area so that the light does not reach the non-exposed area. However, when the types and number of panels cut out from a single substrate are different, it is necessary to provide various types of light-shielding members, and there are problems such as an increase in cost and an increase in space.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to perform scan exposure that can appropriately shield light from a non-exposed region using a light shielding member when performing exposure while relatively moving a substrate and a mask. To provide an apparatus.

The above object of the present invention is achieved by the following configurations.
(1) A scan exposure apparatus that irradiates a substrate transported in a predetermined direction with exposure light through the mask and exposes the pattern of the mask on the substrate,
A mask holding unit for holding the mask;
An irradiation unit disposed above the mask holding unit and irradiating exposure light;
A light-shielding member that is disposed between the irradiation unit and the mask holding unit and shields the exposure light emitted from the irradiation unit;
With
The light shielding member has a pair of blind members that can vary a light shielding width in the predetermined direction that shields the exposure light,
The pair of blind members are supported so that the inclination angle is variable, and one end portions of the pair of blind members overlap each other when viewed from the vertical direction regardless of the inclination angle. A scan exposure apparatus as a feature.
(2) One end of one of the pair of blind members is formed in a substantially flat plate shape, and the one end of the other blind member is formed in a curved shape covering the one end of the one blind member. (1) The scanning exposure apparatus according to (1).
(3) The scanning exposure apparatus according to (1) or (2), wherein the pair of blind members can change an inclination angle so as to be parallel to each other.

  According to the scanning exposure apparatus of the present invention, exposure light is irradiated through a mask onto a substrate transported in a predetermined direction, thereby exposing the mask pattern onto the substrate. The scanning exposure apparatus is disposed above the mask holding unit that holds the mask, the irradiation unit that irradiates the exposure light, the irradiation unit, and the mask holding unit, and is emitted from the irradiation unit. A light shielding member that shields the exposed exposure light. The light shielding member has a pair of blind members that can vary the light shielding width in a predetermined direction for shielding the exposure light, the pair of blind members are supported such that the inclination angle is variable, and the pair of blind members The one end portions overlap each other when viewed from the vertical direction regardless of the inclination angle. Therefore, since the light shielding member uses a pair of blind members to change the light shielding width, when performing exposure while relatively moving the substrate and the mask, the light shielding member can be used to appropriately shield the non-exposed area.

  Hereinafter, a proximity scan exposure apparatus according to an embodiment of the scan exposure apparatus of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 6, the proximity scan exposure apparatus 1 of the present embodiment applies a plurality of masks M on which a pattern P is formed to a substantially rectangular substrate W that is transported in a predetermined direction while approaching the mask M. Then, the exposure light EL is radiated to expose and transfer the pattern P onto the substrate W. That is, the exposure apparatus 1 is a scan exposure apparatus that performs exposure transfer while moving the substrate W relative to a plurality of masks M. Note that the size of the mask used in the present embodiment is set to 350 mm × 250 mm, and the X-direction length of the pattern P corresponds to the X-direction length of the effective exposure region.

  As shown in FIGS. 1 and 5, the proximity scan exposure apparatus 1 floats and supports the substrate W, and transports the substrate W in a predetermined direction (X direction in the drawing), and a plurality of the substrate scanning mechanism 20. A mask holding mechanism 70 having a plurality of mask holding portions 71 each holding a mask M and arranged in two rows in a staggered manner along a direction (Y direction in the figure) intersecting with a predetermined direction, and a plurality of mask holding portions The plurality of irradiation units 80 that are respectively arranged on the upper part of the 71 and irradiate the exposure light EL, and are arranged between the plurality of irradiation units 80 and the plurality of mask holding units 71, and the exposure emitted from the irradiation unit 80. A plurality of light shielding devices 90 that shield the light EL, a mask changer 120 for exchanging each mask M held by the plurality of mask holding units 71, and the mask changer 120 exchanges the mask M. A mask pre-alignment mechanism 140 for pre-alignment of the mask M before, a control unit 190 for controlling these.

  The substrate transport mechanism 20, the mask holding mechanism 70, the plurality of irradiation units 80, the light shielding device 90, the mask changer 120, and the mask pre-alignment mechanism 140 are installed on the ground via the level block 3 (see FIG. 4). It is arranged on the device base 2. Here, of the regions where the substrate transport mechanism 20 transports the substrate W, the region where the mask holding mechanism 70 is disposed above is the mask placement region EA, and the region upstream of the mask placement region EA is the substrate carry-in region. A region downstream of IA and exposure region EA is referred to as a substrate carry-out region OA.

  The substrate transport mechanism 20 is disposed on the carry-in frame 5, the precision frame 6, and the carry-out frame 7 respectively configured by a plurality of square pipes or the like installed on the apparatus base 2 via other level blocks 4 (FIG. 4). See), a floating unit 21 that floats and supports the substrate W by air, and a frame 9 installed on the apparatus base 2 via another level block 8 on the side of the floating unit 21 in the Y direction. The substrate driving unit 40 that is arranged and holds the substrate W and transports the substrate W in the X direction and the substrate loading side area IA are provided, and the substrate W waiting in the substrate loading side area IA is pre-aligned. A substrate pre-alignment mechanism 50 and a substrate alignment mechanism 60 that performs alignment of the substrate W are included. Each level block 3, 4, 8 may be replaced with a vibration isolation table.

  As shown in FIGS. 3 to 5, the levitation unit 21 includes a plurality of long exhaust air pads to which a plurality of connecting rods 22 extending from the upper surface of the carry-in / out and precision frames 5, 6, 7 are respectively attached to the lower surface. 23, 24 and a plurality of elongate intake / exhaust air pads 25a, 25b, an air exhaust system 30 for exhausting air from a plurality of exhaust holes 26 formed in each air pad 23, 24, 25a, 25b, and an air exhaust pump 31, and an air suction system 32 and an air suction pump 33 for sucking air from the intake holes 27 formed in the intake / exhaust air pads 25 a and 25 b.

  The exhaust air pads 23 arranged in the substrate carry-in side area IA and the substrate carry-out side area OA are laid so that the longitudinal direction is mainly along the X direction, and the distance between adjacent pads is relatively increased to reduce the cost. I am trying. As shown in FIG. 3, among the air pads 24, 25a, 25b arranged in the mask arrangement area EA, the exhaust air pad 24 is laid so that the longitudinal direction is along the X direction, while the intake / exhaust air pads 25a, 25b is laid so that the longitudinal direction is along the Y direction.

  Further, as shown in FIG. 5, the intake / exhaust air pads 25a, 25b have a plurality of exhaust holes 26 and a plurality of intake holes 27, and air between the support surfaces 34 of the air pads 25a, 25b and the substrate W is provided. The pressure can be balanced and set to a predetermined flying height with high accuracy, and can be horizontally supported at a stable height.

  As shown in FIG. 6, the intake / exhaust air pads 25 a and 25 b are arranged to face each other so as to be positioned below the mask M at the time of exposure held by the mask holding unit 71, and the exposure region where the pattern P of the mask M is formed. Designed larger. In this way, the intake / exhaust air pads 25a and 25b are designed to be larger than the exposure area of the mask M, so that it is possible to suppress the occurrence of uneven exposure due to the air pads.

  The precision frame 6 extends from the intake / exhaust air pads 24, 25a, 25b arranged in the mask arrangement area EA to one side in the Y direction, and an exhaust air pad 141 constituting a mask pre-alignment mechanism 140 described later is provided. The longitudinal direction is continuously arranged along the Y direction.

  As shown in FIG. 2, the substrate drive unit 40 includes a gripping member 41 that grips the substrate W by vacuum suction, a linear guide 42 that guides the gripping member 41 along the X direction, and a gripping member 41 along the X direction. The mask holding mechanism 70 is attached to the drive motor 43 and the ball screw mechanism 44, which are driven in the above manner, and to be movable in the Z direction so as to protrude from the upper surface of the frame 9 and to the side of the frame 9 in the substrate carry-in area IA. And a plurality of work collision prevention rollers 45 that support the lower surface of the substrate W waiting to be conveyed to. The substrate driving unit 40 is provided only on one side in the Y direction in consideration of the bending of the substrate W, but may be provided on both sides in the Y direction. In addition, the gripping member 41 may be configured to allow driving of the substrate W in the θ direction (around the horizontal plane normal to the X and Y directions).

  As shown in FIG. 7, the substrate pre-alignment mechanism 50 includes an upstream side in the X direction of the substrate carry-in side area IA and one side in the Y direction, that is, one side of the opposite side of the substrate W waiting in the substrate carry-in side area IA. A plurality of reference pins 51, 52 arranged in the vicinity, and a plurality of pressing pins 53, 54 arranged in the X direction downstream side and the other side in the Y direction, that is, in the vicinity of the other side of the opposite side of the waiting substrate W. And a handshake pin 55 that adsorbs the substrate W and can be driven in the X direction together with the adsorbed substrate W.

  The reference pin 51 and the pressing pin 53 that are disposed to face each other in the X direction are disposed at positions that do not overlap with the plurality of air pads 23 in a top view. Each of the reference pin 51 and the pressing pin 53 can move forward and backward from the upper surface of the carry-in frame 5 and can move in the X direction by a driving unit (not shown). The reference pin 52 and the pressing pin 54 arranged to face each other in the Y direction are stretched over a pair of connecting frames 11 extending in the Y direction across a pair of frames 10 (see FIG. 1) on both sides in the Y direction. Attached to the direction frame 18. The reference pin 52 is provided so as to be able to advance and retract downward by a drive unit (not shown), and the pressing pin 54 can be advanced and retracted downward by a drive unit (not shown) and can be moved in the Y direction. The reference pins 51 and 52 and the pressing pins 53 and 54 have bearing rollers 58 and 59 that abut against the edge surface of the substrate W, respectively. Furthermore, the handshake pin 55 is provided in the carry-in frame 5 at a position that can face the substrate W on which the air pad 23 is not disposed, and is driven in the X direction over approximately 2/3 of the substrate carry-in area IA by a drive unit (not shown). Can be moved to.

  The position of the reference pin 51 in the X direction is adjusted by changing the size of the substrate W, changing the alignment mark position for each substrate, changing the transfer start position of the substrate W in order to synchronize with the light shielding device 90 described later, and the like. The Further, the number of each reference pin and pressing pin is at least the number shown in FIG. 7, that is, two reference pins 51, one reference pin 52, and pressing pins 53 and 54, respectively. What is necessary is just to increase as needed.

  As shown in FIG. 7, the substrate alignment mechanism 60 can also be driven in the Y direction together with the two alignment cameras 61 for detecting the reference marks provided on the substrate W and the substrate W, and with the sucked substrate W. A pair of θ correction suction pins 62.

  The alignment cameras 61 are respectively attached to the connection frames 11 and can be moved along the Y direction by a driving unit (not shown). Thereby, when the camera 61 detects the reference mark, the correction movement amount in the X, Y, and θ directions of the substrate W during alignment is calculated. The pair of suction pins 62 is provided on the carry-in frame 5 at a position that can face the substrate W on which the air pad 23 is not disposed, and can be moved in the Y direction and the Z direction by a drive unit (not shown). Accordingly, the pair of suction pins 62 that are separated by a predetermined distance in the X direction move relative to each other in the Y direction, so that the suctioned substrate W is aligned in the θ direction. The alignment adjustment of the substrate W in the X and Y directions is performed by correcting the X direction of the holding member 41 and correcting the Y direction of the mask holding unit 71 described later.

  As shown in FIGS. 2 and 5, the mask holding mechanism 70 is provided for each of the above-described plurality of mask holding portions 71 and the mask holding portions 71. , A predetermined direction, a crossing direction, a vertical direction with respect to the horizontal plane of the predetermined direction and the crossing direction, and a plurality of mask driving units 72 driven around the normal line of the horizontal plane.

  A plurality of mask holding portions 71 arranged in two rows in a staggered manner along the Y direction are arranged on the downstream side with a plurality of upstream mask holding portions 71a (six in this embodiment) arranged on the upstream side. A plurality of downstream mask holding portions 71b (six in this embodiment), and the upstream side between the column portions 12 (see FIG. 1) erected on both sides of the apparatus base 2 in the Y direction. Two main frames 13 are installed on the downstream side, and supported by mask driving units 72. Each mask holding portion 71 has an opening 77 penetrating in the Z direction, and the mask M is vacuum-sucked on the lower surface of the peripheral portion.

  The mask drive unit 72 is attached to the main frame 13 and moves along the X direction. The Z direction drive unit 73 is attached to the tip of the X direction drive unit 73 and is driven in the Z direction. A Y-direction drive unit 75 attached to the Z-direction drive unit 74 and driven in the Y-direction, and a θ-direction drive unit 76 attached to the Y-direction drive unit 75 and driven in the θ-direction. A mask holding portion 71 is attached to the tip of 76. Accordingly, the drive units 73, 74, 75, and 76 are arranged side by side in the X direction, and the mask drive unit 72 is downstream of the upstream mask holding unit 71a and the downstream side of the mask holding units 71a and 71b in the X direction. The side mask holding portion 71b extends to the opposite side to the opposite side and is attached to the main frame 13.

  As shown in FIGS. 5 and 8, the plurality of irradiation units 80 include a light source, a mirror, an optical integrator, a shutter, and the like (not shown) in the housing 81, and exposure light is applied to the mask M held by the mask holding unit 71. Irradiate EL. A guide rail 82 is attached to the lower surface of the casing 81, and the irradiation unit 80 is guided by a slider 83 fixed to the main frame 13 and a subframe 11 described later, and above the mask holding unit 71. Can be moved in the X direction between an exposure position EP (solid line in FIG. 5) disposed at a position and a retracted position RP (two-dot chain line in FIG. 5) deviating from the exposure position EP. For this reason, when the irradiation unit 80 is positioned at the retracted position RP, a space is formed above the intermediate connection frame 16 described later, so that the operator gets on the intermediate connection frame 16 and moves to the mask holding mechanism 40. Therefore, it is possible to easily replace and maintain a light shielding device 90 and various detection means described later.

  The irradiation unit 80 is positioned at the exposure position EP and the retracted position RP by bringing a pair of stopper members 84 a and 84 b provided on the lower surface of the housing 81 into contact with a fixing member 85 provided on the main frame 13. Done in In addition, the irradiation unit 80 is configured with a position detection sensor that detects movement to the exposure position EP. Specifically, a sensor dog 86 is attached to the stopper member 84a that defines the exposure position EP, and the irradiation unit 80 is positioned at the exposure position EP by the photo switch 87 provided in the vicinity of the fixed member 85. Is detected. Note that the fixing member 85 and the photo switch 87 indicated by the one-dot chain line in FIG. 8 indicate the relative positions with respect to the housing 81 when the irradiation unit 80 is positioned at the exposure position EP. In the present embodiment, the amount of movement in the X direction of each irradiation unit 80 is set to 670 mm.

  As shown in FIGS. 5, 9, and 10, the plurality of light shielding devices 90 shield the exposure light EL emitted from the irradiation unit 80 in the vicinity of the mask M held by the mask holding unit 71, and A pair of plate-like blind members (light-shielding members) 108 and 109 that change the inclination angle so that the light-shielding width in a predetermined direction for shielding the exposure light EL, that is, the projection area viewed from the Z-direction, is variable; And a blind drive unit 92 that changes the inclination angle of the pair of blind members 108 and 109.

  The blind drive unit 92 is located between the upstream and downstream main frames 13 and 13 and between the column portions 14 and 14 (see FIG. 1) erected on both sides in the Y direction of the apparatus base 2. It is fixed to the subframes 15, 15 installed on the side through a Z-axis drive mechanism 91 so as to be movable up and down in the Z direction.

  As shown in FIG. 9, the blind drive unit 92 includes four motors 95a, 95a, 95b, and 95b that are mounted on both sides in the Y direction of the casing 93 that defines the opening 93a, and a motor 95a, The screw shafts 96a and 96b are rotated by the rotation of 95b, and the four ball screw mechanisms 98a, 98a, 98b and 98b for moving the nuts 97a and 97b in the X direction and the nuts 97a and 97b are fixed to the sliders 99a and 99b. The sliders 99a and 99b move in the X direction together with the nut 97a via the four linear guides 101a, 101a, 101b and 101b guided by the rails 100a and 100b and the connecting portion 102a fixed to the lower nut 97a by screws. A pair of arm portions 103 to which one blind member 108 is attached and an upper nut. Via a screw fixed coupling part 102b to 97b, provided to move in the X direction together with the nut 97b, a pair of arms 104 the other blind member 109 is attached, a.

  Further, as shown in FIG. 10A, each of the arm portions 103 and 104 includes first arm portions 105a and 105b that move in the X direction together with the nuts 97a and 97b from the casing 93, and each end is a first arm. Second arm portions 106a and 106b that are respectively connected to the lower ends of the portions 105a and 105b and whose other ends are connected to each other. One blind member 108 is fixed below the second arm portion 106a provided on both sides in the Y direction so that the longitudinal direction thereof is along the Y direction. Further, the other blind member 109 is fixed below the second arm portion 106b provided on both sides in the Y direction so that the longitudinal direction thereof is along the Y direction.

  Therefore, when the light shielding device 90 shields the exposure light EL emitted from the irradiating unit 80, the pair of blind members 108 and 109 is stored in a position outside the exposure area in the opening 93a. By driving the upper pair of motors 95a and 95a to move the first arm portion 105b in the X direction so as to be separated from the first arm portion 105a, the pair of blind members 108 and 109 have the same inclination angle. Hold it gradually. Thereby, the exposure light EL in the part where the blind members 108 and 109 have advanced into the exposure region is shielded.

  Further, the pair of blind members 108 and 109 are further opened by driving the pair of lower motors 95b and 95b to move the first arm portion 105a in the X direction so as to be separated from the first arm portion 105b. In addition, the entire exposure area can be shielded by the blind members 108 and 109.

  As shown in FIG. 10B, one end 108a of one blind member 108 is formed in a substantially flat plate shape, and one end 109a of the other blind member 109 is one end 108a of one blind member 108. Has a curved shape covering. Both the blind members 108 and 109 are variable in inclination angle by the drive unit 92, but the one end portions 108a and 109a are close to each other and overlap each other when viewed from the vertical direction regardless of the inclination angle. . Thereby, when the pair of blind members 108 and 109 move in the X direction while changing the inclination angle, the exposure light EL is prevented from leaking at one end side of each other.

  Further, since the inclination angle of the pair of blind members 108 and 109 can be changed to a position where they are parallel to each other, it is possible to suppress the decrease in the exposure amount when the blind members 108 and 109 cross the exposure region as much as possible.

  As shown in FIGS. 11 and 12, the mask changer 120 is disposed between the upstream mask holding portion 71a and the downstream mask holding portion 71b, holds the mask M, and holds the mask M in the mask holding portion. 71 between a pair of mask trays 121 that can be opposed to the lower surfaces of the upstream and downstream mask holding portions 71a and 71b, and between the upstream mask holding portion 71a and the downstream mask holding portion 71b. And a connecting portion 122 for connecting the pair of mask tray portions 121 and a mask replacement driving portion 123 for driving the pair of mask tray portions together with the connecting portion 122 in the Y direction.

  The pair of mask tray portions 121 includes a flat base portion 191, a flat chaser plate 192 having an opening 192 a, which is disposed above the base portion 191 so as to be movable relative to the base portion 191 in the horizontal direction. A mask M is placed on the upper surface around the opening of the chaser plate 192, and a plurality of suction blocks 125 capable of sucking the mask M are provided. A part of the suction block 125 on the tray unit 121 may simply be a support block that supports the mask M.

  In addition, the pair of mask tray portions 121 can be moved in a horizontal direction within a predetermined range with respect to the chaser lift mechanism 193 that lifts the chaser plate 192 relative to the base portion 191 and the base portion 191 in a horizontal direction. As described above, a plurality of spring members 194 connecting the base portion 191 and the chaser plate 192, and a plurality of chaser positioning positions for positioning the chaser plate 192 in the horizontal direction with respect to the base portion 191 during mask pre-alignment described later. The pins 195, a plurality of mask positioning pins 196 for positioning the mask M in the horizontal direction with respect to the base portion 191 during mask pre-alignment, and the mask holding portion 71 during mask replacement A plurality of holder positioning pins 197 for aligning M;

  The chaser plate 192, the chaser levitation mechanism 193, and the spring member 194 constitute a follow-up mechanism, and the chaser plate 192 is moved together with the mask M when the mask M is moved relative to the base portion 191. That is, when the mask is replaced, the chaser plate 192 is caused to follow the movement of the mask holding portion 71 together with the mask M until the holder positioning pin 197 is pressed against the receiving hole 78, and the chaser plate 192 is moved relative to the base portion 191. Move relative. In the mask pre-alignment, the chaser plate 192 is made to follow the movement of the pressing pin 144 of the mask pre-alignment mechanism 140 described later until the chaser plate 192 contacts the chaser positioning pin 195, and the chaser plate 192 is moved to the base portion. Move relative to 191.

  The chaser levitation mechanism 193 includes a pump, an air pad, and the like provided on the chaser plate 192, and causes the chaser plate 192 to float on the base portion 191 by discharging positive pressure air to the base portion 191. The chaser positioning pins 195 are erected on one side in the X direction and one side in the Y direction on the base portion 191, abut against the side surface of the chaser plate 192 during mask pre-alignment, and the chaser plate 192 with respect to the base portion 191. Positioning.

  The mask positioning pins 196 are arranged on the base portion 191 on one side in the X direction and one side in the Y direction as the chaser positioning pins 195, and protrude from pin holes 192 b formed in the chaser plate 192. Specifically, the mask positioning pin 196 is provided inside the chaser positioning pin 195, that is, at a position where it can come into contact when the end surfaces of the mask M supported by the plurality of suction blocks 125 are pre-aligned. Yes.

  The holder positioning pins 197 are erected side by side on the one side in the X direction on the chaser plate 192. As a result, when the mask is replaced, the holder positioning pins 197 are pressed against the receiving holes 78 formed in the mask holding portion 71, thereby holding the mask M aligned with the chaser plate 192 during mask pre-alignment. Align with the unit 71.

  The connecting part 122 connects the pair of mask tray parts 121 obliquely with respect to the X direction in accordance with the arrangement of the connecting part main body 128 to which the slider 127 is attached and the mask holding part 71 arranged in a staggered manner. A pair of arm portions 129.

  The mask replacement drive unit 123 is housed in a support unit 131 that extends in the Y direction below the intermediate connection frame 16 that extends in the Y direction, and a belt 133 that is rotationally driven by the drive motor 132 and the connection unit 122. And a movable portion 134 that is coupled to a part of the belt 133 and is driven in the Y direction by the rotation of the belt 133. The movable part 134 extends laterally from the opening 131a of the support part 131 and is fixed to the connecting part 122 positioned below. A guide rail 135 is provided below the support portion 134, and a pair of mask tray portions 121 are guided in the Y direction by a slider 127 straddling the guide rail 135. The intermediate connection frame 16 is attached to an intermediate portion of frames 17 and 17 extending in the X direction that connect the upstream and downstream subframes 15 and 15 on both sides in the Y direction (see FIG. 1).

  Accordingly, the pair of mask tray parts 121 connected to the movable part 134 via the connecting part 122 drives the belt 133 to exchange the mask M, and a delivery position WP for carrying in or out the mask M. Then, it moves in the Y direction between the lower surface of each mask holding portion 71 and the exchange position CP facing it. The delivery position WP is provided on the side opposite to the one end side in the Y direction where the substrate driving unit 40 is installed so that the mask tray unit 121, the mask exchange driving unit 123, and the like do not interfere with each component of the substrate driving unit 40. ing.

  As shown in FIGS. 13 and 14, the mask pre-alignment mechanism 140 is disposed at the delivery position WP of the mask tray 121 described above and the mask M extending in the Y direction from the mask placement area EA described above. An exhaust air pad 141 that discharges air to the mask tray 121 located in the WP, and a mask pre-alignment driving unit that is provided above the mask delivery position WP and performs pre-alignment of the mask M placed on the mask tray 121 142.

  The mask pre-alignment driving unit 142 connects the pressing plate 143 to the pressing plate 143 driven in the vertical direction and the base member 145 fixed on the intermediate connection frame 16 and drives the pressing plate 143 in the vertical direction. The mask M is provided on the other side in the X direction and the other side in the Y direction with respect to the mask positioning pins 196 provided on the tray portion 121 and the mask M on the lower surface of the plurality of vertical movement cylinders 146 and the pressing plate 143. And a plurality of pressing pins 144 that can move toward the end face of the mask M and a pin driving cylinder 147 that drives the pressing pins 144 in a predetermined direction against the pressing plate 143.

  The mask pre-alignment mechanism 140 drives the pressing pin 144 and moves the mask M in the horizontal direction while pressing the mask M floating on the mask tray 121 with the pressing plate 143, and the mask M is positioned for masking. The mask M is pre-aligned by contacting the pins 196 in the X and Y directions.

  As shown in FIGS. 4 and 11, the proximity scanning exposure apparatus 1 includes various detection means such as laser displacement meters 160 and 161, a mask alignment camera 171, a tracking camera 172, and a tracking illumination 173. ing.

  Laser displacement meters 160 (160a, 160b, 160c) are provided at at least three positions in the region where the substrate W and each mask M face each other. One laser displacement meter 160 a located above the mask M is attached to the mask holding unit 71 and constitutes a gap sensor that detects a gap between the substrate W and the mask M. The two laser displacement meters 160b and 160c located below the substrate are arranged at positions where the substrate W and the mask M face each other on the side of the air pad 25a larger than the exposure region located below the mask M. Is detected (see FIG. 3). When the substrate W is a raw glass, the laser displacement meters 160b and 160c can also detect the gap, and the laser displacement meters 160a, 160b and 160c constitute a gap sensor.

  The mask alignment camera 171 images the reference mark formed on the mask M and transmits it to the control unit 190 described later. The tracking camera 172 captures an image of a reference mark on the substrate W or a ground pattern formed on the substrate W in order to detect a relative displacement between the mask M and the substrate W, and transmits the image to the control unit 190 described later. .

  These two laser displacement meters 160b and 160c, the mask alignment camera 171 and the tracking camera 172 do not protrude from the upper surfaces of the air pads 24, 25a and 25b between the adjacent air pads 24, 25a and 25b in the mask arrangement area EA. It is attached to the precision frame 6.

  The laser displacement meter 161 is attached to the carry-in frame 5 and detects the thickness of the substrate W. The follower illumination 173 is attached to the housing 93 of the blind drive unit 92.

  Here, as shown in FIG. 4, the carry-in, precision, and carry-out frames 5, 6, and 7 connect a plurality of square pipes 180 extending in the horizontal direction and a plurality of square pipes 181 extending in the vertical direction on the apparatus base 2. Configured to define a space 182 penetrating in the X direction and the Y direction. As a result, the worker enters the space 182 and, for example, the air pads 22, 23, 24, 25a, 25b, the above-described various detection means, the work collision prevention roller 45, the reference pin 51, and the pressing pin 53 The auxiliary machines such as the handshake pin 55, the suction pin 62, and the drive shafts of the pins 51, 53, 55, and 62 can be easily exchanged and maintenance work can be easily performed.

  The control unit 190 is connected to each mechanism such as the substrate transport mechanism 20, the mask holding mechanism 70, the irradiation unit 80, the light shielding device 90, the mask changer 120, and the mask pre-alignment mechanism 140 including the detection unit and the driving units. Each mechanism is driven and controlled based on a program and a detection signal from each detection means. In particular, the control unit 190 detects a relative positional deviation between the mask M and the substrate W during exposure, drives the mask driving unit 72 based on the detected relative positional deviation, and sets the position of the mask M to the substrate W. Make it follow in real time. At the same time, the gap between the mask M and the substrate W is detected, the mask driving unit 72 is driven based on the detected gap, and the gap between the mask M and the substrate W is corrected in real time.

  Next, exposure transfer of the substrate W will be described using the proximity scan exposure apparatus 1 configured as described above. In the present embodiment, when a pattern of R (red), G (green), or B (blue) is drawn on the color filter substrate W on which a base pattern (for example, a black matrix) is drawn. Will be described.

  After the proximity scan exposure apparatus 1 supports the substrate W transported to the substrate carry-in area IA by air from the exhaust air pad 23 by a loader or the like (not shown) and performs pre-alignment work and alignment work for the substrate W. Then, the substrate W chucked by the holding member 41 of the substrate driving unit 40 is transferred to the mask arrangement area EA.

  As shown in FIG. 15, in the pre-alignment work of the substrate W, after initialization (step S11), when the substrate W is loaded about 1/3 into the substrate carry-in area IA (step S12), the substrate W is removed from the exhaust air pad 23. The handshake pin 55 located on the upstream side attracts the substrate W and transports it to a predetermined position (step S13). When the substrate W is transported to a predetermined position, the reference pins 51 and 52 and the pressing pins 53 and 54 are driven in the vertical direction, and the bearing rollers 58 and 59 are advanced to a height position where they contact the end face of the substrate W (step) S14). Further, the pressing pins 53 and 54 are moved in the X direction and the Y direction, respectively, and the substrate W is moved while the bearing roller 59 is in contact with the end surface of the substrate W, whereby the substrate W is moved to the bearing rollers of the reference pins 51 and 52. 58, the pre-alignment of the substrate W is completed (step S15).

  Next, in the alignment operation of the substrate W, the pair of θ correction suction pins 62 located on the lower surface of the substrate W are raised and sucked onto the substrate W (step S20). The reference pins 51 and 52 and the pressing pins 53 and 54 are moved so as to be retracted from the height position where the bearing rollers 58 and 59 are in contact with the end surface of the substrate W (step S21). Then, the reference mark drawn on the substrate W is monitored by the alignment camera 61 (step S22), and the correction movement amounts in the X, Y, and θ directions are calculated (step S23). Further, after the calculation, the pair of suction pins 62 are respectively driven in the Y direction to rotate the substrate W in the θ direction, and the base pattern of the substrate W is used as a reference so that the X-direction lattice pattern of the black matrix is along the X direction. θ direction correction is performed (step S24). When the correction movement amount in the Y direction is large, the alignment is performed by synchronously driving the pair of suction pins 62.

  Thereafter, the substrate W is chucked by the gripping member 41 (step S25), and the pair of suction pins 62 release the suction of the substrate W and descend (step S26). Further, in order to synchronize the substrate W and the light shielding device 90, the position in the X direction where the gripping member 41 that chucks the substrate W starts to be transported is corrected (step S27), and further, the mask holding unit 71 is corrected during exposure. In order to reduce the amount, the position in the Y direction of the mask holding unit 71 is corrected in advance (step S28).

  Thereafter, the substrate W is moved in the X direction along the rail 42 by driving the drive motor 43 of the substrate drive unit 40. Then, the substrate W is moved onto the exhaust air pad 24 and the intake / exhaust air pads 25a and 25b provided in the mask arrangement area EA, and is lifted and supported with vibrations eliminated as much as possible. When the exposure light EL is emitted from the light source in the irradiation unit 80, the exposure light EL passes through the mask M held by the mask holding unit 71, and the pattern is exposed and transferred to the substrate W.

  At this time, the shift of the pattern due to the movement error of the substrate W is given by processing the image of the base pattern detected by the tracking camera 172. Then, the mask drive unit 72 can finely adjust the position of the mask M in accordance with the processed image data, thereby correcting the pattern deviation in real time.

  During the exposure operation, the laser displacement meters 160a, 160b, and 160c installed for each mask detect the gap between the substrate W and the mask M. Then, based on the detected gap, the Z direction drive unit 74 of the mask drive unit 72 controls the mask holding unit 71 in real time in the vertical direction. For this reason, when the substrate W is transported by the substrate transport mechanism 20, a height variation of about 30 μm to 40 μm may occur due to the thickness variation of the substrate W. It is possible.

  As described above, pattern exposure can be performed on the entire substrate W by performing continuous exposure in the same manner. Since the masks M held by the mask holding unit 71 are arranged in a staggered pattern, even if the masks M held by the upstream or downstream side mask holding units 71a and 71b are arranged apart from each other, the substrate A pattern can be formed in W without a gap.

  Further, when a plurality of panels are cut out from the substrate W, a non-exposure area where the exposure light EL is not irradiated is formed in a corresponding area between adjacent panels. For this reason, during the exposure operation, the pair of blind members 108 and 109 are opened and closed so that the blind members 108 and 109 are positioned in the non-exposure region in the same direction as the substrate W feed direction in accordance with the feed speed of the substrate W. The blind members 108 and 109 are moved to the first position.

  Further, when the pair of blind members 108 and 109 are moved in the direction opposite to the feeding direction of the substrate W across the light from the irradiation unit 80, the pair of blind members 108 and 109 are folded to a position parallel to each other. Therefore, it is possible to suppress the decrease in the exposure amount when the blind members 108 and 109 cross the exposure region as much as possible.

  In addition, a new substrate W is sent to the substrate carry-in area IA until the substrate W is exposed and sent to the substrate carry-out area OA and carried out. For this reason, the new substrate W supports the lower surface of one end of the substrate W by moving the plurality of work collision prevention rollers 45 upward until the gripping member 41 of the substrate driving unit 40 returns. W pre-alignment work is performed. The upward movement of the plurality of workpiece collision prevention rollers 45 is performed after the reference pins 51 and 52 and the pressing pins 53 and 54 described above are driven in the vertical direction (see step S16 in FIG. 15).

  Further, in order to clean the mask M at a predetermined timing, the mask M is exchanged at any time using the mask changer 120. As shown in FIG. 16, the mask exchange is performed at the same time in the first upstream and downstream mask holding portions 71a1 and 71b1 arranged at one end in the Y direction, and the adjacent upstream side and downstream side sequentially. Side mask holders 71a2, 71b2,. . . , 71a5, 71b5, and finally the sixth upstream and downstream mask holding portions 71a6, 71b6 arranged at the other end in the Y direction.

  Specifically, as shown in FIG. 17, first, the mask driving unit 72 raises all the mask holding units 71 to the retracted position for performing mask replacement (step S <b> 31). At this time, the light shielding device 90 also raises and retracts the housing 93. Then, the counter n is set to 1 (step S32), and a pair of empty mask tray portions 121 on which the mask M is not mounted are moved below the first upstream and downstream mask holding portions 71a1 and 71b1 (exchange position CP). (Step S33). Then, the mask driver 72 of the first upstream and downstream mask holders 71a1 and 71b1 is driven to lower the mask holders 71a1 and 71b1 to the attachment / detachment positions (step S34).

  Next, the mask tray unit 121 receives the used mask M held by the mask holding units 71a1 and 71b1 (step S35). Specifically, the mask holding portions 71a1 and 71b1 release the suction of the used mask M, and the mask tray portion 121 sucks the mask M. Thereafter, the mask holding portions 71a1 and 71b1 are raised to the retracted position (step S36), and the mask tray portion 121 is moved to the delivery position WP (step S37).

  At the delivery position WP, first, the suction of the mask M is released (step S38), and the used mask M is returned from the mask tray 121 to a cassette (not shown) by a mask loader (not shown) (step S39). Thereafter, the unused (cleaned) mask M is placed on the mask tray 121 from the cassette by the mask loader (step S40), and the mask M is pre-aligned by the mask pre-alignment mechanism 140 described later (step S41).

  Then, after the pre-aligned mask M is sucked by the suction block 125, the tray part 121 on which the mask M is placed is moved again below the first upstream and downstream mask holding parts 71a1 and 71b1. (Step S42) The first mask holding portions 71a1 and 71b1 are lowered again to the attachment / detachment positions (Step S43).

  Further, the first mask holding portions 71a1 and 71b1 are moved by the mask driving portion 72, and the position of the unused mask M is finely adjusted (step S44). That is, as shown in FIG. 18, in the state where the mask holding portions 71a1 and 71b1 are lowered to the attachment / detachment position, the holder positioning pins 197 provided on the chaser plate 192 of the tray portion 121 are the receiving holes of the mask holding portions 71a1 and 71b1. 78. In this state, by moving the mask holding portions 71a1 and 71b1 obliquely in the X direction and the Y direction by the mask driving portion 72 (see arrow A), the positioning pin 196 is pressed against the accommodation hole 78, and the mask M Automatic alignment is performed.

  Thereafter, the suction of the unused mask M is released by the tray part 121, and the mask M is sucked by the mask holding parts 71a1 and 71b1 (step S45). Further, the mask holding portions 71a1 and 71b1 are raised to the retracted position (step S46). Thereby, the replacement of the first mask M is completed.

  Next, the vacant mask tray portion 121 is moved from one end in the Y direction to the lower side of the next second upstream and downstream mask holding portions 71a2 and 71b2 (step S47). Thereafter, the counter n is incremented (step S50), and the process proceeds to step S34. The first mask holders 71a1 and 71b1 are lowered to the exposure position and wait after the mask tray 121 moves below the second upstream and downstream mask holders 71a2 and 71b2 (step S48). ).

  Thereafter, the above operation is repeatedly performed until the counter n is 6 in step S49, that is, until the mask M of the sixth mask holding portions 71a6 and 71b6 on the other end side in the Y direction is replaced. Replacement work is completed. In step S47, when the counter n is 6, the mask tray portion 121 of the mask changer 120 moves to the delivery position WP. Therefore, according to the above-described mask exchange, the pair of masks M can be collected and mounted by one reciprocating operation of the pair of mask tray portions 121, and the tact time can be shortened.

  Further, as shown in step S41, when performing the mask exchange, pre-alignment is performed on the mask M transported toward the mask holding unit 71. Specifically, the mask M conveyed by the mask loader is placed on the suction block 125 of the mask tray unit 121. At this time, the base part 191 of the mask tray part 121 is floated by an exhaust air pad 141 located below the mask tray part 121, and the chaser plate 192 is supplied with positive pressure air to the base part 191 by the chaser lift mechanism 193. By discharging, it floats with respect to the base portion 191.

  In this state, the mask pre-alignment driving unit 142 is driven to lower the pressing plate 143 and press the pressing plate 143 against the mask W. Further, the mask M is moved in the X and Y directions while bringing the end face of the mask M into contact with the pressing pin 144. When the mask M is moved, first, the chaser plate 192 on which the mask M is placed also moves with respect to the base portion 191, and the side surface of the chaser plate 192 contacts the chaser positioning pin 195, so that the chaser plate 192 and the base Positioning with the unit 191 is performed. Further, when the mask M is moved, the end face of the mask M comes into contact with the plurality of mask positioning pins 196 and the mask M is aligned with the base portion 191. Accordingly, since the chaser plate 192 and the mask M are aligned with the base portion 191, the mask M is also aligned with the chaser plate 192, and the mask M is placed on the chaser plate 192. The suction block 125 is positioned in the X and Y directions at a desired position. Thereafter, the mask tray unit 121 sucks the mask M by the suction block 125. Then, the pre-alignment of the mask M is completed by raising the pressing plate 143.

  As described above, the proximity scan exposure apparatus of the present embodiment that irradiates the substrate W transported in the X direction with the exposure light EL through the mask M and exposes the pattern P of the mask M onto the substrate W. 1, a mask holding unit 71 that holds the mask M, an irradiation unit 80 that is disposed above the mask holding unit 71 and that emits exposure light, and is disposed between the irradiation unit 80 and the mask holding unit 71. And a light shielding member that shields the exposure light EL emitted from the irradiation section 80. The light shielding member has a pair of blind members 108 and 109 that can change the light shielding width in the X direction for shielding the exposure light EL, and the pair of blind members 108 and 109 are supported so that the inclination angle is variable, In addition, the one end portions 108a and 109a of the pair of blind members 108 and 109 overlap each other when viewed from the vertical direction regardless of the inclination angle. Therefore, since the light shielding width of the light shielding member is variable using the pair of blind members 108 and 109, when performing exposure while relatively moving the substrate W and the mask M, the light shielding member is used to set the non-exposure region. Proper light shielding.

  In addition, one end 108a of one of the pair of blind members 108 is formed in a substantially flat plate shape, and one end 109a of the other blind member 109 is formed in a curved shape covering one end 108a of the one blind member 108. Therefore, even if the blind members 108 and 109 change the inclination angle, the one end portions 108a and 109a always overlap each other when viewed from the vertical direction, and can shield the non-exposure area appropriately and reliably.

  Further, since the tilt angle of the pair of blind members 108 and 109 can be changed so as to be parallel to each other, the blind members 108 and 109 cross the light from the irradiation unit 80 in the direction opposite to the feeding direction of the substrate W. When moving, it is possible to suppress a decrease in exposure amount when the blind members 108 and 109 cross the exposure region as much as possible.

  The present invention has been described above with reference to the embodiments. However, the present invention is not limited to the above-described embodiments, and can of course be changed or improved within the scope of the invention.

  In the present invention, the auxiliary machine including at least one detection means is carried in, precisely, and carried out so that it does not protrude from the upper surface of the air pads 23, 24, 25a, 25b between the adjacent air pads 23, 24, 25a, 25b. , 6 and 7 may be attached.

  The mechanism for levitating and supporting the substrate of the present invention is preferably a levitating unit using air that is available at low cost and is easy to handle as in the present embodiment, but is not limited thereto. In addition, the mechanism for levitating and supporting the substrate of the present invention may be provided at least in the exposure region. In other regions, the substrate W is supported by a plurality of rollers protruding from the support surface, The structure which floats may be sufficient.

  Further, the mask changer 120 of the present invention is configured such that each of the pair of mask tray portions 121 conveys the mask M one by one, but a plurality of masks M may be conveyed respectively.

FIG. 1 is an overall perspective view of a proximity scan exposure apparatus according to an embodiment of the present invention. FIG. 2 is a top view showing the proximity scanning exposure apparatus in a state where the upper structure such as the irradiation unit is removed. FIG. 3 is a view for explaining an arrangement state of the air pads. FIG. 4 is a schematic side view for explaining the substrate transport mechanism. FIG. 5 is a side view showing an exposure state in the mask arrangement region of the proximity scan exposure apparatus. FIG. 6A is a top view of the main part for explaining the positional relationship between the mask and the air pad, and FIG. 6B is a cross-sectional view thereof. FIG. 7 is a top view of the substrate carry-in region for explaining the substrate pre-alignment mechanism and the substrate alignment mechanism. FIG. 8 is a bottom view of the irradiation unit. FIG. 9A is a schematic skeleton top view of the light shielding device, and FIG. 9B is a schematic skeleton side view of the light shielding device. FIG. 10A is an enlarged side view of the main part for showing the relationship between the pair of blind members and the mask, and FIG. 10B is an enlarged view of the main part showing one end part of the pair of blind members. . FIG. 11 is a side view showing a mask exchange state in the mask arrangement region of the proximity scan exposure apparatus. FIG. 12 is a top view showing the mask changer positioned at the delivery position, excluding the mask pre-alignment mechanism. FIG. 13 is a side view showing the mask pre-alignment mechanism. FIG. 14 is a top view showing the mask pre-alignment mechanism. FIG. 15 is a flowchart for explaining the substrate pre-alignment and alignment procedure. FIG. 16 is a top view for explaining a mask replacement procedure. FIG. 17 is a flowchart for explaining a mask replacement procedure. FIG. 18 is a perspective view showing the mask holding part and the mask tray part in the replacement position.

Explanation of symbols

1 Proximity scanning exposure equipment (scanning exposure equipment)
2 Device bases 3, 4 and 8 Level block 13 Main frame 15 Sub frame 20 Substrate transport mechanism 21 Floating units 23 and 24 Exhaust air pad (air pad)
25a, 25b Air intake / exhaust air pads (air pads)
26 Exhaust hole 27 Intake hole 40 Substrate drive unit 50 Substrate pre-alignment mechanism 51, 52 Reference pin 53, 54 Press pin 60 Substrate alignment mechanism 61 Alignment camera 62 θ correction suction pin 70 Mask holding mechanism 71 Mask holding unit 72 Mask Drive unit 80 Irradiation unit 82 Guide rail 83 Slider 84a, 84b Stopper member 90 Light blocking device 92 Blind drive unit 108, 109 Blind member 108a, 109a One end 120 Mask changer 121 Mask tray unit 125 Air pad 126 Positioning pin 140 Mask pre-alignment mechanism 141 Exhaust air pad (air pad)
143 Pressing plate 144 Pressing pins 160, 160a, 160b, 161 Laser displacement meter (detection means, gap sensor)
171 Mask alignment camera (detection means)
172 Follow-up camera (detection means)
173 Tracking illumination (detection means)
190 Control section CP Replacement position WP Delivery position EP Exposure position RP Retraction position IA Substrate carry-in side area EA Mask placement area OA Substrate carry-out area

Claims (3)

A scanning exposure apparatus that irradiates exposure light through the mask onto a substrate conveyed in a predetermined direction, and exposes the pattern of the mask on the substrate,
A mask holding unit for holding the mask;
An irradiation unit disposed above the mask holding unit and irradiating exposure light;
A light-shielding member that is disposed between the irradiation unit and the mask holding unit and shields the exposure light emitted from the irradiation unit;
With
The light shielding member has a pair of blind members that can vary a light shielding width in the predetermined direction that shields the exposure light,
The pair of blind members are supported so that the inclination angle is variable, and one end portions of the pair of blind members overlap each other when viewed from the vertical direction regardless of the inclination angle. A scan exposure apparatus as a feature.   One end of one of the pair of blind members is formed in a substantially flat plate shape, and the one end of the other blind member is formed in a curved shape covering the one end of the one blind member. The scan exposure apparatus according to claim 1, wherein:   The scan exposure apparatus according to claim 1, wherein the pair of blind members can change an inclination angle so as to be parallel to each other.

Images