WO2013157462A1 - 収納容器、収納容器のシャッター開閉ユニット、及びこれらを用いたウエハストッカー - Google Patents
収納容器、収納容器のシャッター開閉ユニット、及びこれらを用いたウエハストッカー Download PDFInfo
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- WO2013157462A1 WO2013157462A1 PCT/JP2013/060838 JP2013060838W WO2013157462A1 WO 2013157462 A1 WO2013157462 A1 WO 2013157462A1 JP 2013060838 W JP2013060838 W JP 2013060838W WO 2013157462 A1 WO2013157462 A1 WO 2013157462A1
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- wafer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
- H01L21/67739—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations into and out of processing chamber
- H01L21/67742—Mechanical parts of transfer devices
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67259—Position monitoring, e.g. misposition detection or presence detection
- H01L21/67265—Position monitoring, e.g. misposition detection or presence detection of substrates stored in a container, a magazine, a carrier, a boat or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J11/00—Manipulators not otherwise provided for
- B25J11/0095—Manipulators transporting wafers
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/40—Safety devices, e.g. detection of obstructions or end positions
- E05F15/42—Detection using safety edges
- E05F15/47—Detection using safety edges responsive to changes in fluid pressure
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/50—Power-operated mechanisms for wings using fluid-pressure actuators
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/60—Power-operated mechanisms for wings using electrical actuators
- E05F15/603—Power-operated mechanisms for wings using electrical actuators using rotary electromotors
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/77—Power-operated mechanisms for wings with automatic actuation using wireless control
- E05F15/78—Power-operated mechanisms for wings with automatic actuation using wireless control using light beams
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- H01L21/673—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders
- H01L21/67346—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders characterized by being specially adapted for supporting a single substrate or by comprising a stack of such individual supports
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- H01L21/673—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders
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- H01L21/67379—Closed carriers characterised by coupling elements, kinematic members, handles or elements to be externally gripped
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- H01L21/673—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders
- H01L21/6735—Closed carriers
- H01L21/67383—Closed carriers characterised by substrate supports
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- H01L21/673—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders
- H01L21/6735—Closed carriers
- H01L21/67389—Closed carriers characterised by atmosphere control
- H01L21/67393—Closed carriers characterised by atmosphere control characterised by the presence of atmosphere modifying elements inside or attached to the closed carrierl
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- H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
- H01L21/67739—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations into and out of processing chamber
- H01L21/67748—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations into and out of processing chamber horizontal transfer of a single workpiece
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
- H01L21/67763—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
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- H01L21/67763—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
- H01L21/67772—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading involving removal of lid, door, cover
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
- H01L21/67763—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
- H01L21/67775—Docking arrangements
Definitions
- the present invention relates to a storage container used for temporarily storing a wafer being processed or a test wafer in a semiconductor manufacturing process that requires a high degree of particle removal and chemical contaminant removal, a shutter opening / closing unit for the storage container, And a wafer stocker using these.
- Various precision manufacturing processes and inspection processes such as coating of photoresist, thin film deposition, preparation of oxide film and nitrification film, etching, heat treatment etc. are sequentially performed on precision electronic components that are substrates such as semiconductor wafers and liquid crystal panels, etc.
- FOUP Front-Opening Unified Pod
- the waiting time is generated due to the difference in time until the processing completion of each processing step.
- the substrate is temporarily stored in a storage device called a stocker, and waits until the next processing is started.
- an operation of determining processing parameters to be actually operated by using a test wafer called a test wafer. Is done.
- Patent Document 1 space saving is achieved by mounting a wafer on each storage ring and stacking the storage rings with an interval such that the wafer surfaces do not contact each other.
- the top and bottom surfaces of the stacked storage rings are covered by a cover, and the storage area of each wafer is isolated from the external environment, and the inside is maintained in an inert gas atmosphere such as nitrogen. It is also possible to Loading and unloading of wafers to and from each storage ring will be performed by a dedicated transfer means installed in the stocker, but at that time access to the transfer means by the drive mechanism that lifts each storage ring individually by a predetermined amount Space is formed.
- the storage ring to be accessed and the storage ring under it can be accessed by the grippers of the transport means when unloading wafers stored in the stacked storage ring or when loading the wafer into the storage ring
- the height is lifted by the opening means.
- the lifted storage ring is returned to the original stacking position by the opening means, but at this time, the lifted storage ring and the adjacent storage ring collide with each other to cause dust
- the problem is that this dust contaminates the wafer placed on the storage ring.
- the target storage ring and all the storage rings disposed thereabove are lifted by the opening means, temporarily increasing the volume of the storage space of the wafer formed by each storage ring and the upper and lower covers, The atmosphere containing dust from the outside environment is sucked into the storage space.
- this prior art has a means for replacing the inside of the storage space with an inert gas atmosphere, the gas filled in the storage space is outside in a short time because the opening area at the time of loading and unloading is large.
- the semiconductor wafer being processed may be processed by oxygen or moisture contained in the air flowing from the external environment. A natural oxide film is formed, and the next processing becomes incomplete, resulting in a decrease in yield.
- the present invention it is possible to prevent the inflow of the external atmosphere, maintain the wafer storage space in a desired atmosphere with a relatively small amount of gas, and prevent the adhesion of dust on the wafer surface.
- the challenge is to provide
- the storage container according to claim 1 of the present invention has an opening on one surface, and can support a plate-like object to be stored therein at a fixed interval in the vertical direction. And a side surface of the main body portion other than the opening portion, and a main body portion having a plurality of arranged shelf boards, a spacer portion arranged between the plurality of shelf boards and maintaining the space between the adjacent shelf boards vertically adjacent to each other It has a cover member which covers up and down, and a plurality of shielding boards which cover the opening corresponding to the plurality of shelf boards, and the shielding board is separated from the shelf board and moved up and down to the main body And a shutter unit for enabling access to an object to be supported and stored, the main body unit having a nozzle unit for supplying clean gas inside, and the shutter unit supplied from the nozzle unit An appropriate amount of the gas is maintained while maintaining the internal pressure of the main body. Is characterized by being arranged at a small gap to flow out can be the body
- the main body portion of the storage container and the shutter are disposed in non-contact with each other, so that dust is not generated due to friction.
- the inside of the main body is maintained at a high pressure by the gas supplied from the nozzle compared to the external environment, the atmosphere containing dust and water vapor from the outside does not enter.
- a storage container according to a second aspect of the present invention is the storage container according to the first aspect, wherein the shelf board is disposed with an interval accessible by the robot finger for holding the stored object. There is.
- the storage container of the second aspect it is possible to carry in and out the object to be stored by the transfer robot.
- a storage container is the storage container according to the first or second aspect, wherein each of the shielding plates of the shutter has the same height dimension as the interval at which the shelf plate is arranged. , It is characterized in that it is arranged so as to be movable up and down individually.
- the storage container of the third aspect it is possible to provide an opening which can be accessed by the transfer robot by raising the shutter by one step. Further, since the shutter only moves in the vertical direction, it is possible to prevent the external atmosphere containing dust from being caught. Furthermore, since the shutter and the main body are disposed with a gap, dust does not occur due to vertical movement.
- the shielding plates of the shutter can move up and down in the plane restricted by the position restricting member. It is characterized by
- the shutter can be prevented from being displaced when moved up and down by the position regulating member.
- the storage container according to a fifth aspect of the present invention is the storage container according to the first to fourth aspects, wherein the main body portion emits light from an optical sensor that detects the presence or absence of the storage object supported by the shelf board. And a detection window through which light can be transmitted.
- the storage object inside the container can be detected by the optical sensor without opening the shutter.
- a storage container is the storage container according to any one of the first to fifth aspects, wherein the gas supplied from the nozzle into the main body part is at the time of opening and closing the shielding plates. And the flow rate can be switched.
- the storage container of the sixth aspect it is possible to maintain the clean atmosphere in the main body when the shutter is opened.
- a storage container according to a seventh aspect of the present invention is characterized in that, in the storage container according to the first to sixth aspects, a gap between the shutter and the main body portion forms a labyrinth structure.
- the storage container of the seventh aspect since the gas flows out through the flow path in the labyrinth shape, it is easy to maintain the positive pressure in the storage container.
- a storage container is the storage container according to any one of the first to seventh aspects, wherein the main body portion has positioning members on the upper surface and the lower surface, and can be stacked and arranged in the vertical direction. It is characterized by
- the storage container can be easily stacked while preventing positional deviation.
- a shutter opening and closing unit according to claim 9 of the present invention is a shutter opening and closing unit for opening and closing the shutter included in the storage container according to any one of claims 1 to 8, wherein the shutter opening and closing unit is the shielding plate. It has a hook that can be engaged with the provided notch, a shutter support mechanism, and an elevation drive unit that moves the shutter support mechanism up and down in parallel with the stacking direction of the storage containers. .
- each shielding plate of the storage container arranged vertically stacked in one shutter opening and closing unit becomes possible.
- the shutter opening / closing unit according to claim 10 is characterized in that the light sensor is formed of a pair of a light emitting unit and a light receiving unit, and is attached to the shutter support mechanism.
- two operations of opening / closing of the shutter and detection of the storage object inside the storage container by the light sensor can be performed by the elevation operation of one elevation drive unit.
- the wafer stocker according to claim 11 of the present invention comprises a clean booth, an FOUP opener joined to the outer surface of the clean booth, and one or more vertically stacked in the clean booth.
- a storage container, the shutter opening / closing unit, a wafer transfer unit for transferring a wafer between the FOUP and the storage container, and a stocker control unit are provided.
- the wafer stocker of the eleventh aspect it is possible to provide a wafer stocker which does not generate dust from the friction caused by the opening and closing of the shutter.
- the wafer stocker according to a twelfth aspect of the present invention is the wafer stocker according to the eleventh aspect, wherein the stocker control unit supplies gas to the inside of the storage container according to an operation of opening and closing the shutter of the shutter opening and closing unit. It has a function to adjust the flow rate of
- the wafer stocker of claim 12 it is possible to suppress a change in the internal atmosphere of the storage container due to the shutter opening and closing operation.
- a wafer stocker is the wafer stocker according to the eleventh or twelfth aspect, wherein a storage rack configured by stacking the storage containers in the vertical direction, and the storage rack at equal intervals.
- a plurality of storage units arranged, a rotary drive unit for rotating the storage units, a shutter opening / closing unit arranged at a position adjacent to the storage units, and the wafer being transported between the FOUP and the storage container And a wafer transfer unit.
- the number of stored items can be increased.
- a wafer stocker according to a fourteenth aspect of the present invention is the wafer stocker according to the eleventh to thirteenth aspects, wherein the storage unit has a circular mounting table on which a plurality of the storage racks are mounted at equal intervals. It is characterized by having.
- the present invention it is possible to prevent the inflow of the external atmosphere and maintain the wafer storage space in a desired atmosphere by a relatively small amount of gas, and to prevent the adhesion of dust on the wafer surface. .
- substrate storage container of this invention It is the perspective view which showed the shutter and peripheral member in the substrate storage container of this invention. It is the figure which showed the wafer transfer operation in the substrate storage container of this invention. It is the figure which showed the flow of the clean gas supplied to the inside of the substrate storage container of this invention. It is the figure which showed the positioning member with which the board
- FIG. 10 is a top view of a wafer stocker including a storage unit according to another embodiment of the present invention.
- FIG. 10 is a top view of a wafer stocker including a storage unit and a horizontal articulated robot according to another embodiment of the present invention.
- FIG. 10 is a cross-sectional view of a wafer stocker including a storage unit and a horizontal articulated robot according to another embodiment of the present invention.
- FIG. 7 is a top view of a wafer stocker comprising a storage unit and an EFEM according to another embodiment of the present invention.
- FIG. 1 is a perspective view showing members constituting the substrate storage container 1 of the present invention
- FIG. 2 is a perspective view showing the substrate storage container 1 and the shielding plate 15.
- a plurality of shelf boards 3 on which the substrates 2 are placed are fixedly stacked inside the substrate storage container 1 with a predetermined interval so as to be mutually parallel in the vertical direction via the spacers 4.
- the substrate 2 which is an object to be accommodated is a semiconductor wafer W which is a plate-like member.
- the distance between the upper and lower sides of the shelf board 3 is 7 mm.
- the shelf board 3 forms a shelf which is arranged so as to be layered in layers so that the wafer W is placed horizontally and the shelf boards are at the same position when viewed from above.
- the shelf board 3 has a substantially U-shape in a top view, and the central portion is a wafer provided on a part of the inner periphery so that the robot finger can move up and down while holding the stored object. It has a cut shape leaving the support portion 5.
- the wafer support portion 5 in contact with the wafer W of the shelf 3 is coated with a resin or natural rubber so as not to damage the wafer W.
- the shelf board 3 which forms a shelf step is a plate-shaped member in this embodiment, this invention is not limited to this.
- grooves may be formed at equal intervals in a plate member arranged vertically, and the storage subject may be placed in the grooves.
- it is also possible sufficiently to reduce the number of parts by integrally molding the plurality of spacers 4 and the plurality of shelf plates 3 stacked in the vertical direction.
- the upper plate 6 and the lower plate 7 are fixed to the shelf plate 3 at predetermined intervals on the upper side and the lower side, respectively, of the shelf plate 3 forming the shelf on which the articles to be stored are placed.
- the cover 9 In the peripheral surface of the assembly consisting of the shelf 3 and the upper and lower plates 6, 7, the surfaces other than the main body opening 10 through which the wafer W passes are covered by the cover 9, and the cover 9 It is screwed or glued to upper and lower plates 6 and 7 which cover all surfaces except the one to be performed so as to maintain the airtight state or the internal atmosphere.
- a semiconductor wafer during processing may react with oxygen or water vapor contained in the atmosphere to form a natural oxide film on the surface of the semiconductor wafer, resulting in incomplete processing of the next process.
- the oxygen concentration in the substrate storage container 1 is reduced to the ppm order by supplying an inert gas such as nitrogen or argon into the substrate storage container 1, or the moisture in the atmosphere is removed.
- atmosphere replacement processing is required to bring the inside of the substrate storage container 1 into a low oxygen or dry state.
- an inert gas such as nitrogen or argon or a clean gas such as clean dry air is provided on the surface opposite to the main body opening 10 for carrying in and out the wafer W
- the nozzle 11 which discharges to the is disposed.
- the nozzle 11 is fixed to the lower plate 7 and discharges the gas supplied from the gas supply means from the through hole 12 opened in the lower plate 7 to the inside of the substrate storage container 1 through the tube. Details will be described later.
- the cover 9 covering the main body portion made of an assembly 8 in which the plurality of shelf boards 3 and the spacers 4 are stacked is provided with an opening portion (main body opening portion 10).
- an opening portion main body opening portion 10
- rectangular cutout holes are formed, and a transparent resin cover 13 is attached so as to cover the cutout holes.
- the hole and the transparent resin cover 13 have a role as a window for detecting the presence or absence of the wafer W by transmitting light along the optical axis 14 of the wafer presence / absence sensor provided in the shutter support mechanism described later. ing.
- the material of the transparent resin cover 13 is preferably resin, particularly polycarbonate or acrylic, but in place of such a resin, glass or other material having transparency to such an extent that the optical axis 14 of the sensor is transmitted. You may use it. Further, by making the internal pressure higher than the external pressure, the cover 9 made of an opaque material that does not transmit light such as stainless steel or aluminum is provided with a slit having a width that does not hinder maintaining the inside in a predetermined atmosphere. The sensor light may be transmitted along the optical axis 14 through the slit.
- the internal pressure By controlling the internal pressure so that the external pressure is higher than the internal pressure, the amount of air and other gases coming out of the slit and the amount of gas supplied can be controlled to be equal or larger. It becomes possible to set it as such. Furthermore, it is also possible to provide only one window for detection on one of the surfaces, and to detect the presence or absence of the wafer W by an image recognition system using a reflected light sensor or a camera.
- FIG. 3 is a view showing a wafer transfer operation in the substrate storage container of the present invention.
- Each shielding plate 15 has a height equal to the distance between the top and bottom of the stacked shelves 3 (the height of the shelf + the height of the spacer). It is arranged to be supported by the lower plate 7 in a vertically stacked state.
- the shielding plate 15 is U-shaped in top view, and is formed so as to wrap around and cover the main body opening 10 of the substrate storage container 1 on its both side surfaces (see FIG. 2).
- Each shielding plate 15 is disposed so as to be positioned approximately at the center or slightly below the distance between the upper and lower two adjacent shelf plates 3 in the closed state. Since the distance between the lower surface of each wafer W and the lower surface of the corresponding shielding plate 15 has a height dimension through which the finger 24 of the robot can pass, the corresponding shielding plate 15 is lifted by that height dimension. The robot finger 24 can lift the wafer W housed therein.
- the finger 24 of the robot travels horizontally straight between the upper surface of the shielding plate 15 located below the opening 16 and the lower surface of the wafer W. See FIG. 3 (a).
- the opening of the shielding plate 15 will be described later with reference to FIG.
- the inserted finger 24 of the robot lifts the wafer W slightly and lifts the wafer W away from the shelf board 3. See FIG. 3 (b).
- the finger 24 of the robot performs a retracting operation in the horizontal direction, and carries the wafer W out of the substrate storage container 1.
- the wafer W is carried out between the upper surface of the shelf 3 and the lower surface of the shielding plate 15 lifted. See FIG. 3 (c).
- the height of the opening 16 is defined by the thickness dimension of the wafer W and the finger 24 holding the wafer W and the rising distance when lifting the finger 24, it is possible from the viewpoint of maintaining the environment inside the substrate storage container 1. It is preferable to be as small as possible.
- a positioning shaft 18 which is a member (position regulating member) for regulating the horizontal position is inserted. Similar to the stacking direction of the shielding plates 15, the positioning shaft 18 is disposed so as to be perpendicular to the surface of the wafer W stored inside the storage container.
- the opening and closing of the shielding plate 15 is performed in the vertical direction within the plane perpendicular to the surface of the wafer W along the positioning shaft 18 with the target shielding plate 15 and all the shielding plates 15 located above the shielding plate 15 Slide to do.
- the positioning shaft 18 is fixed at its both ends to projecting portions formed on the left and right sides of the upper and lower plates 6, 7, respectively.
- substrate storage container 1 of this embodiment is equipped with the column-shaped positioning shaft 18 as a position control member of the shielding board 15, this invention is not limited to it.
- the cylindrical positioning member for example, a conical projection is provided on the upper surface of the shielding plate 15 and a recess having a shape corresponding to the conical projection is provided on the lower surface, and stacking is automatically performed on the upper and lower shielding plates. Positioning and sliding may be possible. Further, recesses may be provided on both the left and right ends of the shielding plate 15 and positioning rails may be arranged to be fitted in the recesses so as to be vertically slidable.
- the shutter portion S composed of a plurality of shielding plates 15 provides a slight gap 19 to the cover 9 and the upper and lower plates 6 and 7 all around the main body opening 10. It is arranged.
- FIG. 4A is a cross-sectional view of the substrate storage container 1 as viewed from the top
- FIG. 4B is a cross-sectional view as viewed from the side.
- the width of the gap 19 between the shielding plate 15 and the members such as the cover 9 around the main body opening 10 of the substrate storage container 1 and the upper and lower plates 6 and 7 is 0.5 mm.
- the diameter of the through hole 17 provided in the shielding plate 15 is made substantially the same as the diameter of the positioning shaft 18 or the diameter of the positioning shaft 18 plus 0.5 mm, the shielding plate 15 can It is possible to move up and down without contacting the member.
- the inside of the substrate storage container 1 has a positive pressure compared to the external environment, and the atmosphere of this positive pressure is a gap around the main body opening 10 By acting as an air seal that flows out from 19 to the outside, it is also possible to prevent the infiltration of the atmosphere containing dust and water vapor from the outside.
- the gap 19 may adopt a shape that allows air to linearly flow out from the inside of the substrate storage container 1, but a shield plate is obtained by changing the flow direction of the gas and reducing the flow rate. It is possible to maintain the positive pressure inside the substrate storage container 1 while preventing the contact between the member 15 and the surrounding members.
- the nozzle 11 provided in the substrate storage container 1 of the present invention is vigorously diffused into the supply nozzle for supplying the gas introduced from the gas supply source (not shown) through the tube to the inside of the substrate storage container 1. It is desirable to have a diffusion restraining member to prevent this.
- the cross-sectional shape of the nozzle 11 provided with the diffusion suppression member 11c is shown typically in FIG.4 (c).
- the introduction pipe 11 a for introducing the gas into the substrate storage container 1 is provided with a plurality of jet ports 11 b for ejecting the gas.
- the diffusion suppressing member 11c covers the introduction pipe 11a in order to prevent the gas from being vigorously diffused into the container.
- the diffusion suppressing member 11c is made of, for example, a porous material which can transmit the gas jetted from the introducing pipe 11a and can prevent the gas from being vigorously diffused from the introducing pipe 11a into the container. Is preferred.
- the introduction pipe 11a is provided with a large number of jets 11b.
- the jets 11b are provided so as to discharge gas toward the gaps in the height direction of the wafer W placed on each shelf 3. Is preferred.
- the cylindrical diffusion suppressing member 11c is preferably a member that suppresses the injection output of the gas without reducing the amount of outflow of the supplied gas as much as possible.
- a member that suppresses the injection output of the gas without reducing the amount of outflow of the supplied gas as much as possible.
- porous ceramic or a metal sintered body obtained by sintering stainless steel, nickel or the like By supplying inert gas or clean dry air via the injection output suppression member, generation of turbulent flow can be prevented, and laminar flow can be supplied into the interior of the substrate storage container 1, and positive pressure is applied to the outside.
- the flow parallel to the wafer W can be formed between the wafers W mounted inside while maintaining the pressure, and the flow can be made to flow out through the gap 19.
- an adjustment means for adjusting the flow rate of the gas supplied between the supply source and the nozzle 11 is provided, and the supply flow rate of the gas is changed in conjunction with the opening / closing operation of the shielding plate 15. It is possible to efficiently maintain the low oxygen concentration atmosphere. For example, when the means for opening and closing the shielding plate 15 opens the shielding plate 15, a large amount of gas is discharged into the substrate storage container 1 as compared with the state in which the shielding plate 15 is closed. Thereby, even if the gas flows out from the opening 16, the gas in the substrate storage container 1 can be maintained at a high concentration. Further, by supplying a relatively large amount of gas at the time of opening, dust is prevented from intruding into the interior of the substrate storage container 1 through the opening 16.
- the consumption amount of gas can be suppressed by reducing the supply amount of gas when reaching the predetermined concentration.
- the timing of switching the supply amount of gas for example, an oximeter is installed in the substrate storage container 1 and the supply amount of gas is adjusted when the oxygen concentration falls below or exceeds a predetermined oxygen concentration.
- the supply amount may be adjusted depending on the timing of each operation or the passage of time, such as several seconds before and after the opening operation or closing operation of the shielding plate 15.
- a common control unit it is easy to efficiently adjust the supply amount of gas. Become.
- FIG. 2 shows the substrate storage container 11 of the present embodiment provided with ten shelf plates 3, the present invention is not limited to this.
- the semiconductor wafer W is accommodated in the FOUP 38 in the semiconductor manufacturing plant and moves between the respective processes.
- a general FOUP 38 can store 25 semiconductor wafers W inside, so that the number of stored substrates of the substrate storage container 1 of the present invention can also be stored 25 or a multiple thereof, in order to manage the wafers W Preferred.
- a plurality of substrate storage containers 1 can be stacked vertically.
- the upper and lower plates 6 and 7 of the substrate storage box 1 are provided with positioning members 20 for accurately positioning the upper and lower substrate storage containers 1 when the plurality of substrate storage containers 1 are stacked in the vertical direction.
- the positioning member 20 is composed of a positioning pin provided on the upper surface of the upper plate and a positioning block provided on the bottom surface of the lower plate.
- FIG. 5A when the two substrate storage containers 1 are stacked vertically, the positioning member 20 of the upper plate 6 of the lower storage container 1 and the lower plate 7 of the storage container 1 stacked on the upper side It is a figure which illustrates the engaged state.
- FIG. 5 (b) is a perspective view illustrating positioning pins 21 disposed on the upper surface of upper plate 6, and FIG. 5 (c) is a perspective view illustrating positioning blocks 23 disposed on the bottom surface of lower plate 7.
- FIG. 5 In the example shown in FIG. 5, on the upper surface of the upper plate 6, cylindrical positioning pins 21 whose upper surface has a hemispherical shape are erected at three places on a predetermined circle. Further, on the bottom surface of the lower plate 7, a positioning block 23 having a groove 22 having a V-shaped cross section is disposed at a position opposite to the position where the positioning pin 21 is erected.
- Positioning block 23 shown in FIG. 5 is a position corresponding to positioning pin 21 so that the center of V-shaped groove 22 coincides with a straight line extending from the center position of the circle passing through the central axes of positioning pin 21. It is arranged.
- the positioning member 20 having such a shape, the stacked substrate storage containers 1 are accurately disposed at the same position in the upper and lower portions.
- the height of the entire member 20 is about 12 mm.
- FIG. 6 is a partially cutaway view illustrating the entire shutter opening / closing unit 25.
- the shutter opening / closing unit 25 vertically moves the shutter support mechanism 27 for inserting the hooks 26 for opening and closing in the notches formed on the left and right ends of the shielding plate 15, and the shielding plate 15 and the shutter support mechanism 27 in the vertical direction. It is comprised from the raising / lowering drive part 28 to make it.
- the hook 26 has a shape such that the tip end portion can be fitted into the notch portion of the shielding plate 15, and is rotatably mounted on a cylindrical support shaft 29 erected on the shutter support mechanism 27 via a bearing. It is done.
- a protrusion 30 is formed at the other end of the hook 26, and the protrusion 30 is connected to the piston rod 32 of the air cylinder 31. Accordingly, the hook 30 pivots around the support shaft 29 in conjunction with the advancing and retracting operation of the piston rod 32 by the supply of the compressed air to the air cylinder 31.
- each member of the shutter support mechanism 27 is accommodated in the covers 27a and 27b, even if dust is generated by the rotation operation, it does not scatter outside.
- the hooks 26 are disposed about 30 mm above the upper surface of the support beam 35.
- the covers 27 a and 27 b covering the support mechanism 27 are spaced apart so as to be a distance larger than the diameter of the wafer W. Therefore, when the wafer W is carried in and out by the finger 24 of the robot, the finger 24 accesses the inside of the substrate storage container 1 above the support beam 35 and between the covers 27 a and 27 b to carry in the wafer W or It can be carried out.
- the air cylinder 31 is provided as means for pivoting the hook 26, but the present invention is not limited to this.
- a motor or an electromagnet may be used, or the hook 26 may be rotated by directly fixing the hook 26 to the rotation shaft of the motor or the rotary actuator. Further, the hook 26 may be linearly reciprocated between the support position and the support release position to be engaged with the shielding plate 15.
- the distal end portion of the hook 26 is engaged with the notch portion of the shielding plate 15 by retracting and retracting the piston rod 32, and the shielding plate 15 is supported at a supporting position to extend forward. Is configured to be at the support release position.
- the supply and shutoff of the compressed air to the air cylinder 31 can be switched by opening and closing the solenoid valve 33.
- the opening and closing of the solenoid valve 33 is controlled by the support control means 80.
- the air cylinder 31 is provided with a detection sensor 34 for detecting the advancing and retreating position of the piston rod 32. By detecting the advancing and retreating position of the piston rod 32, it is detected whether the hook 26 is in the support position or the support release position. It is possible to do.
- the on / off signal of the detection sensor 34 is transmitted to the support control means 80.
- the advancing and retracting mechanism consisting of the hook 26, the support shaft 29 and the air cylinder 31 is attached to the support beam 35 at a symmetrical position with respect to the notches formed at the left and right ends of the shielding plate 15.
- a light emitting unit 36 and a light receiving unit 37 of a transmitted light optical sensor for detecting the presence or absence of the wafer W inside the substrate storage container 1 are attached to the support beam 35 so as to face each other via a bracket, The positions and inclinations of the light transmitting unit 36 and the light receiving unit 37 are adjusted so as to be detected by the light receiving unit 37 irradiated from the light emitting unit 36 along the optical axis 14.
- the light emitting unit 36 is disposed so as to project from the support beam 35 at a position where the optical axis 14 of the irradiated light passes through the window of the cover 9 and is shielded by the wafer W. It protrudes from the support beam 35 so as to be located on the optical axis 14 of the light emitted from the portion 36.
- the shelf board 3 inside the substrate storage container 1 can be If the wafer W is present, the light from the light emitting unit 36 is blocked by the wafer W and does not reach the light receiving unit 37. If the wafer W is not present on the shelf board 3, the light from the light emitting unit 36 is It reaches the light receiving unit 37 without being blocked by the wafer W. Based on this information, the presence or absence of the wafer W in the substrate storage container 1 can be determined.
- the driving unit for moving the light emitting unit 36 and the light receiving unit 37 is provided with means for detecting positional information such as an encoder or a sensor, the timing of light emission and light blocking during movement in the vertical direction is stored in the storage device. This makes it possible to detect (map) which shelf 3 the wafer W is on and which shelf 3 the wafer W does not exist. The on / off signal of this transmitted light sensor is sent to the support control means 80.
- the optical axis 14 emitted from the light emitting unit 36 to the light receiving unit 37 may be disposed parallel to the wafer W on the shelf plate 3, but the light from the light emitting unit 36 to the light receiving unit 37 is
- the axis 14 may be inclined to have a predetermined angle with respect to the wafer W.
- the wafer W can not sufficiently block light, so it is preferable to dispose the wafer W at an incline.
- the elevation driving unit 28 for moving the support beam 35 as the base member of the shutter support mechanism 27 and the shutter support mechanism 27 vertically in the direction perpendicular to the surface of the wafer W will be described in detail.
- the support beam 35 supports the shutter support mechanism 27 for pivoting the hook 26 at the upper part, emits light to the above-described light emitting unit 36 inside, detects the light received by the light receiving unit 37, A sensor amplifier that outputs to the support control means 80 as an off signal is accommodated.
- the support beam 35 has a rectangular parallelepiped shape extending in the horizontal direction, and one side thereof is fixed to the elevation base 39 of the elevation drive unit 28.
- the support beam 35 according to the present embodiment has a one-sided support structure in which one end is fixed to the lift base 39.
- a lightweight and rigid material such as aluminum, stainless steel or carbon fiber.
- one elevating mechanism may be provided at each end of the support beam, and both ends of the support beam 35 may be fixed to each elevating base 39.
- the lift drive unit 28 has a U-shaped cross section open at one end and a vertically elongated box-shaped frame 40, and a motor 41 serving as a driving source inside the box-shaped frame 40 via a pulley and a belt.
- the ball screw shaft 42 is connected and the ball nut 43 fitted to the ball screw shaft 42 and moved up and down by the rotational movement of the screw shaft 42 is provided.
- the box-shaped frame 40 is erected so that the open surface faces the direction in which the support beam 35 is disposed, and is perpendicular to the surface of the wafer W stored inside the substrate storage container 1, and inside thereof
- the ball screw shaft 42 is disposed in parallel with the erecting direction of the box-shaped frame 40.
- the elevation drive unit 28 is provided with two slide guides 44 disposed on both sides of the ball screw shaft 42 in parallel with the ball screw shaft 42 inside the box-shaped frame 40.
- the mover 45 of the two slide guides 44 and the ball nut 43 are fixed to each other by a lift base 39. With this configuration, the elevation drive unit 28 can smoothly raise and lower the elevation base 39 and the shutter support mechanism 27 fixed to the elevation base 39 by the rotational driving force of the motor 41.
- the shape of the elevating base 39 prevents the dust from scattering from the box-shaped frame 40 to the outside. It is desirable to use a shape.
- the lifting base 39 of the present embodiment has a U-shaped top view so as to cover the open portion of the box-shaped frame 40, and prevents the scattering of dust.
- the motor 41 which is a drive source is preferable because an AC / DC servomotor or a stepping motor has high responsiveness and a positioning function. Furthermore, it is desirable to provide a brake means for preventing the rotation shaft of the motor 41 from rotating when the power is turned off so that the shutter support mechanism 27 and the elevating base 39 do not fall by their own weight when the power supply to the motor 41 is turned off. .
- the elevation drive unit 28 of the present embodiment moves the elevation base 39 up and down by transmitting the rotational drive force of the motor 41 to the ball screw shaft 42
- the present invention is not limited to this, and a ball screw
- the pinion gear engaged with the rack laid in the box-shaped frame 40 may be moved up and down by rotating the motor with a motor, or the belt stretched in the vertical direction may be replaced with a motor. It may be moved up and down by rotating.
- the operation of the shutter support mechanism 27 and the elevation drive unit 27 will be described.
- the operations of electric components such as the motor 41, the air cylinder 31, and the detection sensor 34 provided in the shutter support mechanism 27 and the elevation drive unit 28 are controlled by the stocker control unit 81.
- a mapping operation is performed to detect on which shelf plate 3 inside the substrate storage container 1 stacked and disposed the wafer W is present.
- the shutter support mechanism 27 is raised or lowered from one of the uppermost or lowermost sides of the stacked substrate storage containers 1 to the other to move the optical axis 14 connecting the light emitting unit 36 and the light receiving unit 37 It is done by moving up and down.
- the elevator drive unit 28 receives the movement command of the motor 41 transmitted from the stocker control unit 81, controls the rotation of the motor 41 so that the optical axis 14 moves from the lowermost position to the uppermost position of the substrate storage container 1,
- the support mechanism 27 is moved up and down.
- the support control means 80 of the shutter support mechanism 27 transmits a sensor light shielding signal to the stocker control unit 81.
- the control unit 81 having received the sensor light blocking signal stores the position data of the shutter support mechanism at the time of receiving the signal in the storage unit provided in the stocker control unit 81.
- the elevation drive unit 28 further moves and passes over the wafer W that has blocked the optical axis 14, the optical axis also enters the light receiving unit.
- the support control means 80 of the shutter support mechanism 27 also transmits this incident signal to the stocker control unit 81.
- the stocker control unit 81 having received the incident signal stores the position data of the shutter support mechanism 27 at the time of receiving the signal in the storage unit included in the stocker control unit 81.
- the thickness of the object that is blocked by the light axis 14 is determined.
- the thickness data at this time and the thickness data of the wafer W taught in advance are collated to determine whether the wafer whose light axis 14 is shielded is the wafer W or not. If it is recognized that the wafer W is, the storage means stores which shelf 3 the wafer W is on by collating with the position data of the shelf 3 taught in advance.
- the data is discarded, and if it is recognized that the wafer W is detected, the position data is compared with the previously taught data, and which shelf plate It is stored as data whether or not the wafer is placed on 3.
- the stocker control unit 81 transmits a movement command to the elevation drive unit 28 so as to move to the target open / close position of the shielding plate 15.
- the elevation driving unit 28 drives the motor 41 based on the position data previously taught and stored in the storage unit, and moves the shutter support mechanism 27.
- the support control means 80 of the shutter support mechanism 27 operates the solenoid valve 33 to supply compressed air to the air cylinder 31.
- the hook 26 is pivoted to the closed position. Since the rotation of the hook 26 is detected by the detection sensor 34, the support control means 80 of the shutter support mechanism 27 transmits a shutter clamp completion signal to the stocker control unit 81 when the detection signal is received.
- the stocker control unit 81 that has received the shutter clamp completion signal transmits a lift command of the shielding plate 15 to the elevation drive unit 28.
- the lift drive unit 28 having received the lift command drives the motor 41 based on the lift movement data taught and stored in advance in the storage means, and lifts the shielding plate 15.
- the lift driving unit 28 transmits a lifting completion signal to the stocker control unit 81, and the lifting operation of the shielding plate 15 is completed. If the relative position between the hook 26 and the optical axis 14 is defined so that the optical axis 14 is shielded by the target wafer W at the position where the lifting operation is completed, the shielding plate 15 can be used. After completion of the opening operation, the wafer W can be checked again. By doing this, it is possible to prevent problems during the transfer of the wafer W in advance.
- the shielding plate 15 can be opened to allow access to the shelf plate 3 of the robot finger 24, a predetermined wafer W loading / unloading operation is performed.
- the lowering operation of the shielding plate 15 is performed this time.
- the lowering operation of the shielding plate 15 is performed by following the procedure of the lifting operation described above.
- the received lifting drive unit 28 causes the motor 41 to return to the position before the lifting operation.
- the stocker control unit 81 transmits a shutter unclamping command to the support control means 80 of the shutter support mechanism 27, and the support control means 80? Performs an unclamping operation.
- the stocker control unit 81 transmits a movement command to the support control means 80 to move the shutter support mechanism 27 to the next predetermined position, or transmits a command to stand by at that position.
- the opening and closing operation of the shielding plate 15 is completed.
- FIG. 7 is a top plan view of the wafer stocker 46 according to the first embodiment of the present invention
- FIG. 8 is a cross-sectional view taken along the line A-A 'of FIG.
- the stocker 46 of the present embodiment includes a clean booth formed by a frame 47 forming an internal space and a cover attached to the frame 47 and shielding the inside from the external environment, and a substrate housing fixed to the frame 47 in a stacked state.
- the container 1 is joined to the frame 47 by the wafer transfer unit 48 for transferring the wafer W between the substrate storage container 1 and the FOUP 38, and sealed. It comprises an opener 49 which mounts the FOUP 38 which is a container and opens the inside, and an aligner 50 which positions the wafer W in the horizontal direction and the rotational direction.
- an FFU (Fan Filter Unit) 51 for forming the air flow inside the wafer stocker 46 from the top to the bottom is installed.
- the FFU 51 filters air drawn in from the outside in a clean state where dust is removed by a filter and feeds it into the inside of the wafer stocker 46 as a laminar flow, thereby maintaining the air pressure inside the clean booth slightly higher than the external environment.
- an opening is provided on the floor surface of the clean booth so that the laminar clean air supplied from the FFU 51 can flow out to the outside environment.
- the opening is preferably configured to be able to adjust the opening area, and the FFU 51 and this appropriately adjusted opening area prevent the entry of air containing dust from the outside, and clean By efficiently discharging the dust generated from the drive mechanism or the like disposed inside the booth to the outside, the internal space of the wafer stocker 46 can be maintained in a clean atmosphere.
- the opener 49 has a mounting table on which the FOUP 38 is mounted, an opening for circulation of the wafer W, and a door for opening and closing the opening.
- the FOUP 38 When the FOUP 38 is placed on the mounting table, the door and the lid of the FOUP 38 are integrated, and then the door descends to allow communication between the inside of the FOUP 38 and the internal space of the wafer stocker 46 while keeping the door closed from the outside. It is to do.
- the aligner 50 is a device that aligns the center position of the wafer W and a recess provided for alignment called a notch, and is unique to each wafer W applied to the wafer W simultaneously with the alignment and imprinted on the surface of the wafer W. It has a function to read the ID number.
- the aligner 50 is not an essential component of the wafer stocker, but is necessary when it is necessary to manage the wafers W individually for each ID.
- the wafer transfer unit 48 is a cylindrical coordinate type robot 54 in which two sets of arm bodies 53 connected at a reduction ratio by a predetermined pulley and a timing belt are arranged on a base 52 that rotates in a horizontal plane by driving a motor. Is equipped. A finger 24 for holding the wafer W by suction is provided at the tip of each arm 53 (in FIG. 7, only one finger 24 is shown because the upper and lower positions overlap).
- the cylindrical coordinate robot 54 has a structure in which the arm 53 performs bending and extension operations by rotating each arm in a horizontal plane by the driving force of the motor, and the fingers 24 provided at the tip are linearly moved by the bending and extension operations. doing.
- the wafer transfer unit 48 further includes a Z-axis drive unit 55 that moves the cylindrical coordinate robot 54 up and down along the stacked direction of the substrate storage containers 1, and the substrate storage containers having different heights with respect to the fingers 24. You can also access 1
- the cylindrical coordinate robot 54 is disposed at the center in a top view, and the substrate storage container 1 is concentrically centered on the pivot axis of the pivotable base 52 of the robot 54.
- the substrate storage container 1 and the opener 49 are disposed at positions where their openings face each other across the robot 54.
- the substrate storage container 1 has a configuration in which 10 sets of shelf boards 3 arranged in 10 stages are stacked in 10 stages.
- 100 wafers W can be accommodated, which corresponds to four FOUPs 38 capable of accommodating 25 wafers W inside.
- positioning of ten or more steps is also possible enough, it is restrict
- Each substrate storage container 1 is connected with a pipe for supplying a gas such as an inert gas or clean dry air to a nozzle 11 provided inside.
- the pipe is a pipe for supplying the gas having a large flow rate until the predetermined low oxygen concentration is obtained when the shutter is opened and after the shutter is closed, and after the predetermined low oxygen concentration is reached, the predetermined oxygen concentration in the substrate storage container 1 is obtained.
- Two systems of piping for supplying the above-mentioned gas with a small flow rate for maintaining are connected to the respective substrate storage containers 1. Switching between the high flow rate piping and the low flow rate piping is switched by separate electromagnetic switching valves. The switching of the piping is performed by a stocker control unit 81 provided in the wafer stocker 46.
- the supply source of inert gas and clean dry air may be stored in a tank, or may be supplied from a supply tank provided in a factory. Furthermore, since the gas supplied from the supply source may contain dust generated from members such as storage tanks, pipes, and fittings, the gas is supplied in a clean state through a clean filter for dust collection.
- the gas supplied from the supply source is adjusted to a large flow rate and a small flow rate by the flow control valve corresponding to each substrate storage container 1 after the supply pressure is adjusted by the regulator.
- the tip of each flow rate adjustment valve of large flow rate and small flow rate is connected to the switching valve, and the gas of a predetermined flow rate is supplied to the desired substrate storage container 1 by the electric signal from the stocker control unit 81.
- the wafer W stored in the FOUP 38 is carried to a FOUP mounting table on the opener 49 by an Automated Guided Vehicle (AGV), an Overhead Hoist Transfer (OHT), or manually. Thereafter, when the lid is opened by the opener 49, the wafer W stored therein is transferred to the aligner 50 by the robot 54. When notch alignment and reading of the ID number are performed by the aligner 50, the read ID number is stored in the storage means of the stocker control unit 81 provided in the stocker 46.
- AGV Automated Guided Vehicle
- OHT Overhead Hoist Transfer
- the stocker control unit 81 storing the ID number refers to the wafer presence / absence data for each shelf board 3 obtained by the mapping operation of the shutter opening / closing unit 25 described above, and the shelf board 3 of the predetermined substrate storage container 1 A command is issued to place the wafer W thereon, and the wafer transfer unit 48 transfers the wafer W to the designated position of the shelf 3.
- the stocker control unit 81 operates the switching valve of the pipe communicating with the storage container 1 to increase the supply amount of the inert gas to the storage container to which the wafer W is to be loaded.
- the shutter opening / closing unit 25 operates to open the shielding plate 15. Since the inert gas continues to flow out of the opening 16 of the shielding plate 15 when the shielding plate 15 is opened, dust generated by the opening operation of the shielding plate 15 does not enter the inside of the substrate storage container 1 and is directed downward by the FFU. Flows out from the bottom of the stocker 46 to the outside by the clean laminar flow of When the shielding plate 15 is opened, the finger 24 holding the wafer W is inserted to the position taught in advance inside the substrate storage container 1. Thereafter, the fins 24 move downward by the amount of movement taught in advance to place the wafer W on the shelf 3. After mounting the wafer W, the wafer transfer unit 48 retracts the finger 24 to the standby position, and the mounting process of the wafer W is completed.
- the stocker control unit 81 causes the shutter opening / closing unit 25 to descend and causes the shielding plate 15 to close.
- a large flow rate of inert gas is continuously supplied, but it is small when the predetermined concentration is reached. It is switched to the flow rate.
- the substrate storage container 1 in which the shielding plate 15 is not opened or closed is maintained in a state where a small flow rate of inert gas is supplied to maintain the inside at a predetermined low oxygen concentration.
- the stocker control unit 81 receives an instruction to carry out the predetermined wafer W from the upper-level program managing the processes of the entire semiconductor manufacturing factory, and based on the data stored in the storage means, It will be carried into the Since the ID numbers of the respective wafers W are acquired and managed at the time of loading, it is not necessary to pass through the aligner at the time of unloading, and they are directly transported from the substrate storage container 1 to the FOUP 38.
- the wafer W can be taken out of the substrate storage container 1 by the two fingers 24 respectively provided in the two arm bodies 53. Can be placed on the FOUP 38 at the same time.
- the distance between the upper and lower fingers 24 can be the same as the distance for placing the wafer W of the FOUP 38, two wafers W can be simultaneously loaded by simultaneously expanding and contracting the two arm bodies 53. The transport time can be shortened.
- FIG. 9 is a plan view showing the wafer stocker 56 of the present embodiment
- FIG. 10 is the wafer stocker of FIG. 9 as viewed from the line BB ′ of FIG. 7 (please insert the line BB ′ in FIG. 9).
- the transfer robot provided in the wafer stocker 56 according to the present embodiment has cylindrical coordinates of the structure of connecting the pulley and the belt provided in the first embodiment at a predetermined reduction ratio and expanding and contracting the arm body and hence the finger 24 in the linear direction.
- a horizontal articulated robot 58 is mounted which can rotate the base ends of the arms of the arm body 57 independently of each other by individual motors. Since each arm of the horizontal articulated robot 58 is freely rotatable, as shown in FIG. 9, not only the front of the robot 58 but also the diagonally forward or diagonally backward of the robot 58 can be accessed. There is.
- the horizontal articulated robot 58 mounted on the wafer stocker 56 of the present embodiment has a first arm 60 rotatably supported at one end by a base 59, and one end rotatably supported at the other end of the first arm.
- each arm and finger 24 can perform an interpolation operation in a direction such as diagonally forward or diagonally backward as compared with the cylindrical coordinate robot 54 only capable of linear expansion and contraction toward the target position. It is also possible to access it.
- the horizontal articulated robot 58 is provided with the Z-axis drive unit 55 for moving up and down along the stacked direction of the storage containers, and is arranged in a stacked manner. The respective fingers 24 can access the substrate storage container 1 as well.
- each storage unit 63 four storage cabinets 62 configured by stacking the substrate storage containers 1 in the vertical direction are arranged at equal intervals with an angle of 90 degrees so that the respective main body opening portions 10 face outward. Then, it is possible to rotate these four storage shelves 62 in a horizontal plane.
- the storage unit 63 includes a support member 64 for supporting four storage shelves 62 installed at equal intervals, and a rotation drive unit 65 for rotating the support member 64.
- the support member 64 included in the present embodiment has a structure in which the storage shelf 62 is mounted on a circular rotary table 67 rotatably fixed to the base 66 via a bearing, and the center of the rotary table 67
- a support column 68 provided with a fixing member for fixing the upper portion of each storage shelf 62 is erected in the table, and the rotary table 67, the support column 68, and each storage shelf 62 are horizontal It rotates together in one. Furthermore, when the storage racks 62 are fixed to each other by the connecting member, the storage racks 62 are not shaken by the inertia force even in the operation of rotation and stop of the rotary table 67.
- the rotary drive unit 65 for rotating the support member 64 has a pulley fixed to the rotary shaft of the motor 69 and a bottom surface of the rotary table 67 with the driving force of the motor 69 capable of controlling the rotational position such as a stepping motor or servomotor.
- the belt is configured to be transmitted via a belt which is bridged between the pulley fixed to the belt.
- the control of the motor 69 is controlled by a control unit (not shown) included in the storage unit 63, and the control unit can rotationally move the support member 64 at an arbitrary rotation angle.
- the shutter opening / closing unit 25 is disposed at a position adjacent to the storage unit 63, and after the rotary table 67 is stopped at a predetermined rotation position, the shielding plate 15 of the substrate storage container 1 can be opened and closed. There is.
- a sensor 70 may be provided to determine whether the rotary table 67 has stopped at a predetermined position.
- the wafer stocker 56 of the present embodiment is provided with four openers 49 for mounting the FOUP 38 and opening and closing the lid.
- the opener 49 is joined to the frame 71 of the stocker 56.
- a wafer transfer unit 48 having a horizontal articulated robot 58 mounted thereon is disposed at a position opposite to the opening of the FOUP 38 mounted.
- the shutter opening and closing units 25 are disposed on the left and right sides of the wafer transfer unit 48, and the storage units 63 are disposed at positions corresponding to the shutter opening and closing units 25, respectively.
- the position of the wafer W is not interfered with the wafer W transfer operation of the arm body 57.
- An aligner 50 for positioning is disposed.
- the FFU 51 is provided on the frame 71 forming the wafer stocker 56 and the upper part of the cover, and a clean booth is formed inside the wafer stocker 56 by the frame 71, the cover (not shown) and the FFU 51.
- 100 wafers W can be accommodated in one accommodation rack 62 as in the first embodiment, and the wafers W are accommodated in the entire two storage units 63.
- the number of sheets is 800, and it is possible to dramatically increase the number of sheets stored from the first embodiment.
- the number of wafers W stored in the storage rack 62 is regulated by the installation environment of the semiconductor manufacturing factory to be installed, the number of stored storages of the storage rack 62 can be increased significantly. It is.
- the opener 49 arranges the wafer transfer unit 48 provided with the cylindrical coordinate robot 54 as shown in FIG.
- a horizontal movement means 78 is provided to reciprocate in parallel in the horizontal plane with respect to the row, and the cylindrical coordinate robot 54 is moved to a position opposite to the FOUP 38 or the storage shelf 62. It is also possible to carry in and out the
- FIG. 12 is a top view of the wafer stocker 72 of the present embodiment.
- the wafer stocker 72 of the present embodiment is equipped with an EFEM (Equipment Front End Module) 73.
- the EFEM 73 is a device for transferring the wafer W between the processing apparatus for performing various processes such as exposure, resist application and etching on the wafer W in the semiconductor manufacturing process and the FOUP 38, and at least the opener 49, the transfer robot and the aligner 50. It consists of Further, in the EFEM 73 provided in the present embodiment, a delivery table 74 for delivering the wafer W to and from the wafer stocker 72 is disposed on the surface opposite to the surface on which the opener 49 is disposed.
- a wafer transport unit 48 mounted with the above-described horizontal articulated robot 58 is disposed near the approximate center of the upper surface of the internal space formed by the frame 75, the cover, and the FFU 51. Furthermore, four storage units 63 disclosed in the previous embodiment are arranged around the wafer transfer unit 48 at predetermined intervals.
- a shutter opening / closing unit 25 is disposed at a position corresponding to each of the four storage units 63.
- the four shutter opening / closing units 25 and the storage unit 63 are disposed in the operable space of the arm 57 provided in the horizontal articulated robot 58, and the horizontal articulated robot 58 stores the delivery stand 74 and the storage by the above configuration.
- the wafer W can be transferred between the substrate storage containers 1 of the unit 63.
- 16 storage shelves 62 capable of storing 100 wafers W can be arranged, so that it is possible to store a total of 1,600 wafers W, according to the second embodiment.
- a double number of wafers W can be stored with respect to the wafer stocker.
- the number of wafers W stored in the storage rack 62 is regulated by the installation environment of the semiconductor manufacturing factory to be installed, the number of stored storages of the storage rack 62 can be increased significantly. It is.
- the EFEM 73 provided in the present embodiment is formed by a frame 76 different from the frame 75 forming the wafer stocker 72, and the frame 76 and the frame 75 are coupled to each other by coupling means.
- the EFEM 73 provided in the present embodiment includes four openers 49 along the longitudinal direction of the frame 76, and the wafer W is delivered to and received from the FOUPs 38 mounted on the respective openers 49 by the handling robot 77 disposed therein. It will be transported to and from the platform 74.
- the EFEM 73 provided in the present embodiment is provided with the FFU 51 on the upper part of the frame 76, so that the space inside the EFEM 73 and the wafer W to be transferred can always be maintained in a clean atmosphere.
- the wafer stocker 72 of this embodiment has a width substantially the same as the width of the surface on which the opener 49 of the EFEM 73 provided adjacently is disposed.
- the width dimension of the wafer stocker 72 is made equal to or smaller than the width dimension of the EFEM 73, for example, replacing the system and wafer stocker 72 for other processes while leaving only the EFEM 73 in a certain processing apparatus Can be easily done.
- the task of increasing the width dimension occupied by a specific device from the existing layout is very expensive, so the width dimension of the entire device should be equal to the width dimension of the existing EFEM 73. It is important to fit. It can also have a role as an apparatus called a sorter which switches FOUP 38 which stores EFEM 73 according to the processing condition of wafer W.
- the wafer stocker 72 of this embodiment includes the horizontal articulated robot 58, in addition to that, as shown in FIG. 13, the cylindrical coordinate robot 54 is provided instead of the horizontal articulated robot 58.
- a wafer transfer unit 48 may be provided. That is, the wafer transfer unit 48 including the cylindrical coordinate robot 54 is disposed in the arm operation area defined by the four shutter opening and closing units 25, and the wafer transfer unit 48 is arranged in the direction in which the shutter opening and closing units 25 are arranged.
- a horizontal moving means 78 is provided to reciprocate in parallel in the horizontal plane.
- FIG. 15 is a graph in which the time to reach the target oxygen concentration is measured by the difference in the width of the gap 19 and the flow rate of the supplied gas.
- the dimension of the gap 19 is set to two conditions of 0.5 mm and 1.0 mm, and the supply amount of nitrogen is supplied to the substrate storage container 1 having these two gaps at five liters per minute and two conditions at 10 liters per minute.
- the time to reach a predetermined oxygen concentration of 500 ppm was measured.
- the test set to 3.0 mm of the dimension of the clearance 19 was also performed, the predetermined oxygen concentration was not reached.
- the gap 19 in 1.0 mm reaches the target oxygen concentration about 20 seconds earlier, but nitrogen gas is supplied at 5 liters per minute.
- the target oxygen concentration is reached about 30 seconds earlier.
- Continuous delivery of 10 liters of gas can shorten the arrival time, but considering the total consumption of the gas, it is effective if the delivery time is less than half that of 5 liters when 10 liters is delivered. Is small.
- the arrival time reaches the target oxygen concentration sooner as the dimension of the gap 19 is 0.5 mm.
- the gap 19 is set to 0.5 mm, and when opening and closing the shutter unit S, 10 liters per minute of clean gas is supplied, and after reaching the target concentration, 5 liters per minute is supplied. It is desirable to switch to the amount from the relation between the consumption of clean gas and the arrival time.
- FIG. 16 is a graph showing the test results.
- the value on the X-axis side indicates, in seconds, the passage of time when the supply of nitrogen gas into the storage container 1 is started as 0.
- the shutter portion S is opened at an elapsed time of 575 seconds and closed at an elapsed time of 590 seconds.
- the opening and closing time is set to 15 seconds in consideration of the fact that the time required for opening and closing the series of shutter units S and transferring the wafer W is about 15 seconds.
- the oxygen concentration which was 500 ppm before opening the shutter portion S increased only to about 3000 ppm even if the shutter portion S was opened and closed. If the oxygen concentration is 3000 ppm, there is no possibility that the pattern formed on the surface of the wafer W reacts with oxygen to form an oxide film. Therefore, even if the shutter portion S is opened and closed, the wafer stored in the storage container 1 It can be said that W has no adverse effect.
- the present invention has been described in detail, the present invention is not limited to the disclosed embodiments, and the detailed structure and the like in each embodiment is within the scope of the present invention described in the claims by those skilled in the art. It can change suitably, without deviating from. For example, changing the object to be stored to the wafer W and changing it to a plate-like member such as a liquid crystal glass substrate, a reticle, or a mask is also a matter that can be appropriately designed. It can be selected appropriately according to the situation.
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Abstract
Description
載置されたFOUP38の開口部分に対向する位置には水平多関節型ロボット58を搭載したウエハ搬送部48が配置されている。ウエハ搬送部48の左右両脇にはシャッター開閉ユニット25が配置されていて、このシャッター開閉ユニット25に対応する位置にそれぞれ貯蔵ユニット63が配置されている。
3 棚板
4 スペーサ
5 ウエハ支持部分
6 上プレート
7 下プレート
8 組立体
9 カバー
10 本体開口部
11 ノズル
11a 導入管
11b 噴出口
11c 拡散抑止部材
15 遮蔽板
18 位置決めシャフト(位置規制部材)
20 位置決め部材
21 位置決めピン
23 位置決めブロック
24 フィンガ
25 シャッター開閉ユニット
26 フック
27 シャッター支持機構
28 昇降駆動部
46 第1実施形態のウエハストッカー
48 ウエハ搬送部
49 オープナ
50 アライナ
54 円筒座標型ロボット
56 第2実施形態のウエハストッカー
63 貯蔵ユニット
72 第3実施形態のウエハストッカー
80 支持制御手段
81 ストッカー制御部
S シャッター部
Claims (14)
- 一方の面に開口部を有しており、内部に板状被収納物を支持可能に鉛直方向に一定の間隔で配置された複数の棚板と、前記複数の棚板の間に配置されて上下に隣接する前記棚板の間隔を維持するスペーサ部とを有する本体部と、
前記本体部の前記開口部以外の側面及び上下を覆うカバー部材と、
前記複数の棚板に対応して前記開口部を覆う複数の遮蔽板を有し、前記遮蔽板を前記棚板とは分離して上下動させることにより前記本体部に支持収納されている被収容物へのアクセスを可能にするシャッター部とを備え、
前記本体部は内部に清浄な気体を供給するノズル部を有し、前記シャッター部は前記ノズル部から供給された前記気体を、前記本体部の内圧を維持しつつ適量外部に流出可能に前記本体部に対し微小な隙間を空けて配置されていることを特徴とする収納容器。 - 前記棚板は、前記被収納物を保持するロボットフィンガがアクセス可能な間隔をもって配置されていることを特徴とする請求項1に記載の収納容器。
- 前記シャッターの各前記遮蔽板は前記棚板の配置された間隔と同じ高さ寸法を有し、個別に上下移動可能に積み重ねて配置されていることを特徴とする請求項1もしくは請求項2に記載の収納容器。
- 前記シャッターの前記各遮蔽板は位置規制部材によって規制された面内を上下移動可能であることを特徴とする請求項1から請求項3に記載の収納容器。
- 前記本体部は、前記棚板に支持された被搬送物の有無を検出する光センサから照射される光が透過可能な検出窓を有することを特徴とする請求項1から請求項4に記載の収納容器。
- 前記ノズルから前記本体部内に供給される前記気体は、前記各遮蔽板の開放時と閉鎖時とで流量を切り替えることができることを特徴とする請求項1から請求項5に記載の収納容器。
- 前記シャッターと前記本体部との隙間は、ラビリンス構造を形成していることを特徴とする、請求項1から請求項6に記載の収納容器。
- 前記本体部は、上面と下面に位置決め部材を有し、鉛直方向に積み重ねて配置可能であることを特徴とする請求項1から請求項7に記載の収納容器。
- 請求項1から請求項8に記載の収納容器が有する前記シャッターを開閉するシャッター開閉ユニットであって、前記シャッター開閉ユニットは、前記遮蔽板に設けられた切り欠き部に係合可能なフックと、シャッター支持機構と、前記シャッター支持機構を前記収納容器の積み重ねられた方向に対し平行に昇降移動させる昇降駆動部とを有することを特徴とするシャッター開閉ユニット。
- 前記光センサは投光部と受光部との一対からなり、前記シャッターシャッター支持機構に取り付けられていることを特徴とする請求項9に記載のシャッター開閉ユニット。
- クリーンブースと、前記クリーンブースの外面に接合されたFOUPオープナと、前記クリーンブース内に上下方向に1つまたは2つ以上積み重ねて配置された前記収納容器と、前記シャッター開閉ユニットと、前記FOUPと前記収納容器との間でウエハを搬送するウエハ搬送部と、ストッカー制御部とを備えることを特徴とするウエハストッカー。
- 前記ストッカー制御部は、前記シャッター開閉ユニットの前記シャッターを開閉する動作に応じて前記収納容器内部に供給する気体の流量を調節する機能を有することを特徴とする請求項11に記載のウエハストッカー。
- 前記収納容器を上下方向に積み重ねて構成される収納棚と、前記収納棚を等間隔に複数配置する貯蔵ユニットと、前記貯蔵ユニットを回転動作させる回転駆動部と、前記貯蔵ユニットに隣接する位置に配置されるシャッター開閉ユニットと、前記FOUPと前記収納容器との間で前記ウエハを搬送する前記ウエハ搬送部とを備えることを特徴とする請求項11もしくは請求項12に記載のウエハストッカー。
- 前記貯蔵ユニットは、前記収納棚を等間隔に複数載置する円形状の載置テーブルを備えることを特徴とする請求項11から請求項13に記載のウエハストッカー。
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KR1020147031706A KR102091892B1 (ko) | 2012-04-16 | 2013-04-10 | 수납 용기, 수납 용기의 셔터 개폐 유닛 및 이들을 사용한 웨이퍼 스토커 |
CN201380019946.6A CN104221136B (zh) | 2012-04-16 | 2013-04-10 | 收纳容器、收纳容器的开闭器开闭单元、及使用它们的晶圆储料器 |
EP13778995.4A EP2840599B1 (en) | 2012-04-16 | 2013-04-10 | Accommodating container and wafer stocker using same |
JP2014511183A JP5913572B2 (ja) | 2012-04-16 | 2013-04-10 | 収納容器、収納容器のシャッター開閉ユニット、及びこれらを用いたウエハストッカー |
US14/513,979 US9437466B2 (en) | 2012-04-16 | 2014-10-14 | Storage container, shutter opening/closing unit of storage container, and wafer stocker using storage container and shutter opening/closing unit |
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Also Published As
Publication number | Publication date |
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TWI582023B (zh) | 2017-05-11 |
JP5913572B2 (ja) | 2016-04-27 |
CN104221136A (zh) | 2014-12-17 |
EP2840599A4 (en) | 2015-11-18 |
EP2840599A1 (en) | 2015-02-25 |
CN104221136B (zh) | 2017-05-31 |
US20150030416A1 (en) | 2015-01-29 |
EP2840599B1 (en) | 2021-03-31 |
US9437466B2 (en) | 2016-09-06 |
TW201404686A (zh) | 2014-02-01 |
JPWO2013157462A1 (ja) | 2015-12-21 |
KR20150002802A (ko) | 2015-01-07 |
KR102091892B1 (ko) | 2020-03-20 |
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