Classifications

• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
  • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
  • H10P72/06—Apparatus for monitoring, sorting, marking, testing or measuring
  • H10P72/0606—Position monitoring, e.g. misposition detection or presence detection
  • H10P72/0608—Position monitoring, e.g. misposition detection or presence detection of substrates stored in a container, a magazine, a carrier, a boat or the like
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
  • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
  • H10P72/04—Apparatus for manufacture or treatment
  • H10P72/0402—Apparatus for fluid treatment
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
  • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
  • H10P72/30—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for conveying, e.g. between different workstations
  • H10P72/34—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
  • H10P72/3402—Mechanical parts of transfer devices

Definitions

• the invention relates to a device for handling disc-shaped objects in a handling level of a local clean room, which contains a magazine holder, which can be measured in height relative to the handling level, and essentially contains work stations for processing and inspection purposes which are located in the handling level.
• a device for handling disc-shaped objects in a handling level of a local clean room which contains a magazine holder, which can be measured in height relative to the handling level, and essentially contains work stations for processing and inspection purposes which are located in the handling level.
• Such technical solutions can be used in the manufacture of integrated circuits, in particular for handling tasks.
• SMIF boxes standard mechanical inter face boxes
• the magazines are unloaded from the transport containers with suitable means and the objects are removed with a handler. After processing, they are returned both to the magazine compartments and to the magazine in the transport container. So far, it was only used on large devices such as wafer steppers, implanters, etc. limited, so that there is currently no universal applicability of such SMDF solutions for a large number of process steps.
• the magazines with the objects are often removed from the SMIF boxes using more or less complex devices and manually or automatically converted to the processing and inspection devices.
• US Pat. No. 4,746,225 describes a device for handling and inspecting wafers or masks as disk-shaped objects in a local clean room with an SMIF box, handler and work station.
• the handler and workstation are surrounded by an outer cover, into which the magazine with the objects can be inserted after placing the SMIF box on the cover and placed on a holder.
• the handler can be adjusted in the z-axis to remove the objects from different levels of the magazine and to transfer them to the workstation.
• the magazine is indexed in that, after the reference level has been recorded in the magazine by measuring technology, the locations of the window segments are calculated and stored mathematically using the design data of the magazine used in each case.
• the number of objects and their storage locations can be determined relative to a reference level within the magazine.
• this or the handler must be positioned in the grid of the compartments of the magazine. Differing magazine geometries and tolerances must be taken into account or errors cannot be excluded. Problems then arise when an empty magazine is to be loaded as desired or re-sorting within a magazine or from magazine to magazine is required as preparatory or subordinate processes for processing or inspection.
• the object of the invention is to ensure such process steps preceding or following the processing and inspection of the disk-shaped objects under the conditions of a local clean room both when using SMIF boxes and when these boxes are at least partially dispensed with.
• the object is achieved according to the invention by a device for handling disc-shaped objects in a handling level of a local clean room, which contains a magazine holder that can be measured in height relative to the handling level and essentially contains work stations for processing and inspection purposes located in the handling level, by constructing the handling level is in a fixed relationship to a reference plane at least one device for indexing magazines according to their magazine compartments and disc-shaped objects contained therein, which contains the magazine holder as a component, and is arranged above an intermediate floor which divides the clean room into two superposed partial rooms, in which an airflow component of an airflow is directed from the partial space above the intermediate floor into the partial space below the intermediate floor.
• the air flow generated by an air treatment system is directed towards a wall opposite the air treatment system and delimiting the clean room to the outside, which has air outlet openings whose total cross section above the intermediate floor is smaller than the total cross section below the intermediate floor.
• the air treatment unit which is arranged in a common housing serving as a plenum between an inlet and an outlet opening in the flow direction, contains an axial fan and a filter, the inlet opening and the axial fan are provided by a tubular jacket from the plenum to one Air outlet separated in the direction of flow.
• the air outlet contains rotating air flow components placed in the air flow and counteracting air guiding surfaces.
• the air outlet from symmetrical to the axis of rotation of the axial fan is incorporated into a circular section plate that is connected to the casing.
• the device for indexing has an optoelectronic sensor consisting of a transmitter and a receiver, by means of which a measurement of both the magazine compartments and the disk-shaped objects takes place in relation to the reference plane.
• a measuring beam bundle emanating from the transmitter, with its center beam in the reference plane, is felt through between opposing walls containing the magazine compartments and shading the measuring beam bundle and pointing into the interior of the magazine and forming fan-shaped projections of one of the walls, which as Serve support for the disc-shaped objects.
• the magazine compartments themselves and the objects contained therein are measured, whereby the actual conditions are determined, in contrast to a computational determination of the position of a magazine compartment from the design data or the determination of the position on the basis of an index scale.
• removal and return can be carried out as desired, which enables re-sorting in any manner, even between magazines with different compartment spacing, both among one another and to a reference level within the magazine.
• Empty magazines can also be filled as desired.
• a wafer return device For the positioning of disk-shaped objects protruding from the magazine, a wafer return device is provided, the effectiveness of which is linked to a sensor signal from a second sensor, the measuring beam of which is directed parallel to the disk-shaped objects and, when the magazine is adjusted in height, is directly adjacent to the side for removal and loading .
• the wafer return device guides the object back into the magazine compartment without external intervention. Without a manual intervention, a Further transport of the magazine into the transport container guaranteed and damage to protruding objects avoided.
• a handler with a multi-part articulated arm whose axes of rotation are hollow axes and whose front element for receiving the disk-shaped object has a vacuum holding device, from which there is a direct connection to a vacuum present in the hollow axes, is used for trading.
• FIG. 1 shows a front view of a device for handling disc-shaped objects.
• FIG. 2 shows a top view of the intermediate floor in the device according to FIG. 1.
• FIG. 3 shows an air treatment system.
• FIG. 4 shows a possible arrangement for the
• Air baffles Fig. 5 partially in section a device for indexing Fig. 6 the arrangement of an optoelectronic sensor in connection with a sectional view through the magazine Fig. 7 the front view of a magazine with cross-sectional view of a measuring beam bundle Fig. 8 in an adjacent view a section of a the walls of the magazine with inserted disk-shaped objects and an image of the detail scanned by means of the optoelectronic sensor.
• FIG. 9 shows a top view of the magazine with a second sensor and a wafer return device.
• FIG. 10 shows the linking of control and processing in a block diagram - and evaluation units with other units for performing the indexing
• 11 shows a handler in side view
• FIGS. 1 and 2 two opposing devices 2, 3, mounted on a carrier 1, for indexing magazines for disk-shaped objects form together with a handler, which is hidden in this figure and is described in more detail in FIG. 11, and work stations 5, 6, such as a prealiner and a wobble table, basic equipment according to the invention, which are enclosed by an enclosure 7 is.
• SMIF boxes are marked with 4.
• An air treatment system 8 ensures a laminar air flow of the required purity.
• Other workstations can be a barcode reader or an OCR reader. Functions, the device is suitable to serve as a visual inspection device, fiat or notch finder, batch transfer device, loader or unloader, merger and as a splitter.
• the enclosure 7, which is divided into two sub-spaces 10, 11 by an intermediate floor 9, has cut-outs 13, 14 in its wall 12, which is located opposite the air treatment system 8 and outwardly delimits the excess pressure generated.
• a smaller overall cross section of the outbreaks 13 compared to the total cross section of the cutouts 14 leads to an air flow component which is directed from the partial space 10 above the intermediate floor 9 to the partial space 11 below the intermediate floor 9.
• Both a recess 15 provided for the handler and other openings (not shown) in the intermediate floor 9, which are provided for the workstations 5, 6, ensure an overflow of the air flow, as a result of which particles generated by drive elements below the intermediate floor 9 which could interfere with the clean room conditions, are prevented from penetrating into the sub-area 10 serving as a handling, processing and inspection area.
• a housing 16 with an inlet opening 17 in an inlet plate 18 and an outlet opening 19 in an outlet plate 20 contains, in addition to an axial fan 21 arranged along an axis X - X, which is also the axis of rotation of the axial fan 21, a sieve-type compensating device 22 and a high-performance suspended matter filter 23 , which closes tightly with the side walls of the housing 16.
• the pipe socket is as close as possible to the fan blades 25.
• the air outlet consists of symmetrical to the axis of rotation in a plate 26 connected to the pipe socket, circular sector-shaped cutouts 27 with air guide surfaces in the form of air baffles 28, which are placed in the air flow generated by the axial fan 21. These can protrude from the plate 26 both in the direction of the outlet plate 20, as shown in FIG. 4, and in the direction of the inlet plate 18 or in both directions.
• the inclination of the air baffles 28 against the plate 26 depends on the type and structure of the axial fan 21. In essence, a parallel orientation to the fan blades 25 should be chosen.
• air baffles that overlap in pairs due to their size can also be used.
• the surface elements 31 parallel to the high-performance suspended matter filter 23 between the cutouts 27 can be dispensed with.
• the air flow sucked in by the axial fan 21 via the inlet opening 17 and blown in the direction of the outlet opening 19 has, in addition to a directional component in the direction of the outlet opening 19, two components in the direction of the side walls, so that the resultant describes a swirl movement of the air flow.
• This swirl movement would cause an uneven flow against the filter lamellae at the high-performance suspended matter filter 23 and thus would not advantageously utilize the effective filter surface, as a result of which the volume flow of the clean air generated drops as a result of increased air resistance.
• the air baffles 28 counteracting the swirl movement in the air flow compensate for the components in the direction of the side walls, so that the air flow now available only has the component in the direction of the outlet opening 19.
• the inflow pressure is standardized by the sieve-like compensating device 22.
• the effective area of the high-performance suspended-matter filter 23 is flowed vertically and uniformly.
• a device for indexing of which only a part is shown in FIG. 5, has in its interior a magazine holder 33 which can be raised and lowered via a spindle 32 in the z direction (perpendicular to the installation surface of the device).
• the drive of the spindle 32 is carried out with the aid of a stepping motor 34, which is equipped with an angle measuring system 35, so that the distance traveled when lifting or lowering can be determined via the spindle pitch.
• the stepper motor 34 with its control electronics and the angle measuring system 35 together with a control computer 56 according to FIG. 10 form a position controller of a magazine lift, which also includes the spindle 32 and the magazine holder 33.
• a handler 36 has a handling arm 37 working in a handling level HH and, like the magazine lift and an optoelectronic sensor which consists of a transmitter 38 and a receiver 39, is fastened to a common frame 40.
• a measuring beam 41 emanating from the transmitter 38 runs with its center beam in a reference plane EE for indexing in a magazine 42 7, for the sake of clarity, shown in FIG. 7 and the disc-shaped objects 44 contained therein.
• the distance between level E-E and handling level H-H can be selected within the travel range of the spindle drive.
• FIGS. 6 and 7 illustrate the arrangement of the sensor in relation to the magazine 42 and disk-shaped objects 44 possibly inserted into the magazine compartments 43, such as e.g. Semiconductor wafers or stencils.
• the transmitter 38 and the receiver 39 are placed in such a way that the measuring beam 41 passes between walls 45, 46 of the magazine 42 and is directed onto a corner section 47. 8, the corner portion 47 extends so far into the measuring beam 41 that projections 48 directed into the interior of the magazine 42, which serve as supports for the disk-shaped objects 44, shade the measuring beam 41.
• the diagonal radiation shown through the magazine 42 was chosen because it is mostly partially closed on the back. If there is no such termination, it is of course also possible to guide the measurement beam 41 parallel to the walls 45 and 46 and the magazine compartments 43.
• the center beam of the measuring beam 41 advantageously runs directly along the front edge of the projections 48.
• the magazine 42 is adjoined on the side serving for removal and loading (side facing the handler 36) by a further sensor consisting of a transmitter 49 and a receiver 50, which has a defined distance from the first sensor and recognizes objects 51 protruding from the magazine 42 during the transport of the magazine 42 in the positive z direction.
• a wafer return device 52 is provided which, in a plane parallel to the first handling level HH, the displacement of the object 51 into the magazine 42 on the basis of the location information obtained with the first sensor takes over. The transport of the magazine 42 can thus be continued undisturbed without manual intervention.
• the wafer return device 52 consists of a lever mechanism 53 which is driven by an electric motor and which performs a pivoting movement of 90 ° with one revolution of its drive (not shown).
• the reversal point of the lever of the mechanism 53 is arranged such that it pushes the object 51 into the magazine 42 and then returns to an initial position which is monitored by a limit switch 54.
• the stepper motor 34, the angle measuring system 35, the transmitters 38 and 49, the receivers 38 and 50, a third sensor 55, which is firmly connected to the frame 40, the lever mechanism 53 and the limit switch 54 are used to implement the invention linked to a control computer 56 in the manner shown.
• AD converters are provided between the sensors and the control computer 56, of which an AD converter 57 is shown in FIG. 10.
• the magazine compartments 43 and those located therein are indexed disc-shaped objects 44 automatically remove magazine 42 from a dust-protecting transport container (SMIF box) with its bottom and take it over from magazine holder 33.
• the magazine holder 33 is then lowered, that is to say moved in the negative z direction, until a threshold value sw2 of threshold values swl and sw2 advantageously set for data reduction is exceeded. The distance between its base and the reference plane E-E is thus detected by the magazine 42.
• an amplitude-modulated sensor output signal U representing the magazine compartments 43 and the objects 44 is obtained as a function of the path according to FIG. 8 at the receiver 39, which corresponds to the AD converter 57 fed and linked with the help of the control computer 56 with the measurement signal of the angle measuring system 35 and stored.
• a value for the distance between the measuring level EE and the first handling level HH is added to the determined counter reading, and the magazine 42 with the help of the magazine lift in moved to the corresponding z position.
• the handler shown in FIG. 11, which is slightly adjustable by a drive 58 for lifting the disk-shaped objects in the z direction and which corresponds to the handler 36 in FIG. 5, is designed as a two-part articulated arm and consists of an upper arm 60 connected to a hollow axis 59 and a forearm 63.
• the forearm 63 is mounted in the upper arm 60 via an axis 68, which is connected to an inner axis 61 by a toothed belt 62.
• the axes 59, 61 are each driven by a motor 64, 65, which are preferably designed as stepper motors. To achieve the required positioning accuracy, those with a Angle measuring system provided motors 64, 65 coupled to the axles 59, 61 with the aid of high-reduction gears.
• a vacuum holding device 66 provided on the forearm 63 for the disk-shaped objects has a direct connection to a vacuum carried within the axes 61 and 68.
• a vacuum connection between the axes 61 and 68 takes place via a vacuum line 69.
• 67 denotes an interface to a vacuum pump, not shown, which is realized by a fixed connection. The vacuum supply via a moving line is thus avoided.

Landscapes

• Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
• Warehouses Or Storage Devices (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6484131

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (12)

Citations (3)

Family Cites Families (13)

• 1993
  • 1993-03-29 DE DE4310149A patent/DE4310149C2/de not_active Expired - Fee Related
• 1994
  • 1994-02-28 TW TW083101719A patent/TW248613B/zh active
  • 1994-03-25 AT AT94911956T patent/ATE167001T1/de not_active IP Right Cessation
  • 1994-03-25 KR KR1019940704141A patent/KR0148415B1/ko not_active Expired - Fee Related
  • 1994-03-25 JP JP6521651A patent/JP2846957B2/ja not_active Expired - Fee Related
  • 1994-03-25 SG SG1996005812A patent/SG47081A1/en unknown
  • 1994-03-25 DE DE59406121T patent/DE59406121D1/de not_active Expired - Fee Related
  • 1994-03-25 WO PCT/EP1994/000959 patent/WO1994023443A1/de not_active Ceased
  • 1994-03-25 EP EP94911956A patent/EP0642697B1/de not_active Expired - Lifetime

Patent Citations (3)

Non-Patent Citations (3)

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