# Patent

## Title
Substrate case cleaning apparatus

## Abstract

Contaminant is prevented from migrating from a gripping hand and contaminating a substrate case after cleaning the substrate case. The apparatus cleans, in a state with no substrate, a substrate case C which holds a substrate, provided with a booth 10 which forms a clean space, provided with cleaning tanks 40, 50 which hold and clean the parts of the substrate case C in a separated status in the booth 10, provided with a conveyance mechanism 60 which grips part of the substrate case C by a gripping hand 70 and conveys them to and from the cleaning tanks 40, 50, making the gripping hand 70 stand by at a standby position Q in the booth 10 during cleaning of the substrate case C, and provided with a cleaning means 80 for cleaning the gripping hand 70 during cleaning of the parts. The cleaning means 80 is provided with a spray nozzle 81 which sprays a gas toward the gripping hand 70 and an exhaust fan 82 which exhausts the gas from the inside of the booth 10.

## Background
TECHNICAL FIELD
The present invention relates to a substrate case cleaning apparatus which cleans a substrate case which is used when storing or transporting a substrate which is used when transferring a circuit pattern of an electronic device such as a mask substrate or wafer or other semiconductor substrate or other substrate.
BACKGROUND ART
In the past, as this type of substrate case cleaning apparatus, for example, the one which is described in PLT 1 (Japanese Patent Publication No. 2005-109523A) was known. As shown in FIG. 22, this substrate case cleaning apparatus Sa cleans a substrate case C, which comprises a base Cb and a shell Cs which covers this base Cb and which holds a substrate (not shown) at its inside, in the state with no substrate. The substrate case cleaning apparatus Sa is provided with a booth 200 which forms a clean space. Inside this booth 200, a cleaning tank 201 is provided which holds and cleans the parts of the base Cb and shell Cs in a separated state. The cleaning tank 201 is provided with a tank body 202 which has an opening which opens to above and a lid 203 which opens and closes the opening of the tank body 202. At the outside of the booth 200, a setting table 204 which carries the substrate case C is provided. An arm robot 205 grips the substrate case C which is carried on the setting table 204 by a gripping hand 207 and conveys it to a support table 206 which is provided at the inside of the booth 200. Further, the arm robot 205 grips the shell Cs of the substrate case C which is supported at the support table 206 by the gripping hand 207 and conveys it to the inside of the tank body 202 of the cleaning tank 201 and conveys the base Cb of the substrate case C to the lid 203 of the cleaning tank 201 to set it there. After that, the lid 203 is closed. In that state, the shell Cs and base Cb are cleaned inside of the tank body 202. When the cleaning ends, the lid 203 of the cleaning tank 201 is opened, and the arm robot 205 successively conveys the base Cb and shell Cs of the substrate case C on the support table 206 where they are assemble into the substrate case C. Further, again, the aria robot 205 conveys the substrate case C from the support table 206 to the setting table 204 outside of the booth 200.
CITATION LIST
Patent Literature
PLT 1: Japanese Patent Publication No. 2005-109523A
SUMMARY OF INVENTION
Technical Problem
In this regard, in this conventional substrate case cleaning apparatus Sa, during cleaning of the substrate case, the arm robot 205 is made to stand by inside the booth 200 and, after cleaning, the arm robot 205 again grips and conveys the substrate case C. When the gripping hand of the arm robot 205 grips the parts, contaminant which sticks to the parts sometimes migrates and sticks to it to contaminate it. In this case, when gripping and conveying the cleaned parts, the cleaned parts sometimes end up being contaminated by stuck contaminant again.
The present invention was made in consideration of this situation, so provides a substrate case cleaning apparatus which prevents contaminant from migrating from the gripping hand and contaminating the substrate case after cleaning the substrate case.
Solution to Problem
The substrate case cleaning apparatus according to the present invention provides a substrate case cleaning apparatus which cleans, in a state with no substrate, a substrate case which is provided with a base and a shell which covers the base and holds a substrate inside it, the substrate case cleaning apparatus comprising: a booth which forms a clean space, a cleaning tank which is provided inside the booth and holds and cleans parts of the base and shell of the substrate case in a separated state, a conveyance mechanism which grips the parts of the substrate case by a gripping hand and conveys them to the cleaning tank, and a cleaning means for making the gripping hand stand by at a standby position in the booth during cleaning of the substrate case and cleaning the gripping hand during cleaning of the parts.
Due to this, the gripping hand is sometimes contaminated by migration and sticking of contaminant which sticks to the parts due to gripping of the parts, but can be cleaned by the cleaning means, so when gripping and conveying the parts after cleaning, it is possible to prevent the cleaned parts from ending up being contaminated again. Further, the gripping hand is cleaned during cleaning of the parts, so can be cleaned each time cleaning the parts, so it is possible to reliably prevent contamination of the cleaned parts.
Further, in accordance with need, the cleaning means can be configured to have a spray nozzle which sprays a gas to the gripping hand and an exhaust fan which exhausts the gas which was sprayed from the spray nozzle from the inside of said booth. As the gas, for example, air, nitrogen gas, etc. can be used. Gas is sprayed from the spray nozzle to remove the contaminant which stuck to the gripping hand, so the contaminant can be reliably removed. Further, the removed contaminant is exhausted by an exhaust fan to outside the booth, so the inside of the booth can be kept clean at all times.
Advantageous Effects of Invention
According to the substrate case cleaning apparatus of the present invention, the gripping hand is sometimes contaminated by migration and sticking of contaminant which sticks to the parts due to gripping of the parts, but can be cleaned by the cleaning means, so when gripping and conveying the parts after cleaning, it is possible to prevent the cleaned parts from ending up being contaminated again. Further, the gripping hand is cleaned during cleaning of the parts, so can be cleaned each time cleaning the parts, so it is possible to reliably prevent contamination of the cleaned parts.



BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a side cross-sectional view which shows a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 2 is a plan cross-sectional view which shows a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 3 is a horizontal cross-sectional view which shows a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 4 is a front view which shows a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 5 is a perspective view which shows a setting table of a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 6A is a perspective view which shows a support table of a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 6B is a view which shows the state of supporting a substrate case of a support table in a substrate case cleaning apparatus according to an embodiment of the present invention
FIG. 7 is a view which shows a support table and holding mechanism of a substrate case cleaning apparatus according to an embodiment of the present invention together with their actions.
FIG. 8A is a process chart which shows a movement mechanism of a substrate case cleaning apparatus according to an embodiment of the present invention together with its operation (part 1).
FIG. 8B is a process chart which shows a movement mechanism of a substrate case cleaning apparatus according to an embodiment of the present invention together with its operation (part 2).
FIG. 8C is a process chart which shows a movement mechanism of a substrate case cleaning apparatus according to an embodiment of the present invention together with its operation (part 3).
FIG. 8D is a process chart which shows a movement mechanism of a substrate case cleaning apparatus according to an embodiment of the present invention together with its operation (part 4).
FIG. 8E is a process chart which shows a movement mechanism of a substrate case cleaning apparatus according to an embodiment of the present invention together with its operation (part 5).
FIG. 9 is a perspective view which shows an internal configuration of a first cleaning tank (a second cleaning tank) of a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 10A is a plan view which shows the state of supporting an outer shell of a first cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 10B is a side cross-sectional view which shows the state of supporting an outer shell of a first cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 11A is a plan view which shows the state of supporting an outer base of a first cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 11B is a side cross-sectional view which shows the state of supporting an outer base of a first cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 12A is a plan view which shows the state of supporting an inner shell of a second cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 12B is a side cross-sectional view which shows the state of supporting an inner shell of a second cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 13A is a plan view which shows the state of supporting an inner base of a second cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 13B is a side cross-sectional view which shows the state of supporting an inner base of a second cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 14A is a plan view which shows the state of supporting an inner pod at a second cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 14B is a side cross-sectional view which shows the state of supporting an inner pod at a second cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 15A is a plan view which shows the state of supporting an outer pod at a first cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 15B is a side cross-sectional view which shows the state of supporting an outer pod at a first cleaning tank in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 16A is a perspective view which shows a holding mechanism and elevation mechanism in a conveyance mechanism in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 16B is a principal perspective view which show main parts of a gripping hand of a holding mechanism in a conveyance mechanism in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 17A is a view which shows the state of holding an outer shell of a holding mechanism in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 17B is a view which shows the state of holding an outer base of a holding mechanism in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 18A is a view which shows the state of holding an inner shell of a holding mechanism in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 18B is a view which shows the state of holding an inner base of a holding mechanism in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 19 is a perspective view which shows the configuration of a holding part in a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 20A is an overall perspective view which shows a substrate case handled by a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 20B is a disassembled perspective view which shows a substrate case handled by a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 21 is a view which shows an outside surface of an outer base handled by a substrate case cleaning apparatus according to an embodiment of the present invention.
FIG. 22 is a view which shows an example of a conventional substrate case cleaning apparatus.



DETAILED DESCRIPTION OF EMBODIMENT
Below, based on the attached drawings, a substrate case cleaning apparatus according to an embodiment of the present invention will be explained in detail. A substrate case cleaning apparatus S according to an embodiment of the present invention which is shown in FIG. 1 to FIG. 19 is one which handles a substrate case C which holds an EUV mask as the substrate B which is shown in FIG. 20A and FIG. 20B. In recent years, for example, in photolithography drawing integrated circuit patterns on a silicon wafer, along with the higher integration of LSIs, an EUV (Extreme Ultra Violet) mask has been used as the substrate on which EUV light is irradiated in a vacuum. The substrate case C holds and stores this EUV mask and is a double-layer structure. This double-layer structure substrate case C is provided with an inner pod N and an outer pod M. The inner pod N is comprised of an inner base Nb and an inner shell Ns which covers this inner base Nb and holds a mask as a substrate D inside it. The outer pod M is comprised of an outer base Mb which supports the inner base Nb of the inner pod M and an outer shell Ms which covers the outer base Mb. The substrate case C is made a double-layer structure in this way so as to thoroughly protect the substrate D from being contaminated from the outside air. The outer pod M is exposed to the outside air, but the inner pod N is never intentionally exposed to the outside air so long as the outer pod M is not opened. The substrate case cleaning apparatus S cleans the substrate case C in a state with no substrate D.
As shown in FIG. 21, at the center of the outer base Mb of the outer pod M, a latch type lock part 1 is provided which can lock the parts of the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell Ns of the inner pod N to be unable to separate from each other and which can unlock them to enable separation. The lock part 1 has an insertion hole 2 which is formed at the outside surface of the outer base Mb and is provided with a mechanism (not shown) at the inside of this insertion hole 2. A latch pin 21a of a latch drive part 21 which is provided at a later explained support table 20 is inserted from this insertion hole 2. The latch drive part 21 can be turned to lock or unlock the lock part 1. Further, positioning recesses 3 in which positioning pins 15 which are provided at a later explained setting table 13 are inserted are provided in an equiangular relationship at three locations. Furthermore, engagement recesses 4 where engagement projections 23 of the later explained support table 20 and engagement projections 91 for positioning use which are provided at a back surface of a lid 43 of the first cleaning apparatus 40 are provided in an equiangular relationship at three locations adjoining the outsides of the positioning recesses 3.
The substrate case cleaning apparatus S according to an embodiment of the present invention, as shown in FIG. 1 to FIG. 4, is provided with a booth 10 which forms a clean space. The booth 10 is provided with an opening 11 through which a substrate case C can pass and which is opened and closed by a shutter 12. The shutter 12 is made to open and close by an actuator 12a. At the outside of the opening 11 of the booth 10, a setting table 13 on which the substrate case C can be positioned and set at a predetermined orientation at a predetermined position is provided. The setting table 13 supports the substrate case C with the outer base Mb facing down. As shown in FIG. 5, it is formed into a fork shape which has an opening part 14 which opens toward the booth 10 side and exposes the engagement recesses 4 of the outer base Mb of the substrate case C. At the top surface of the setting table 13, three positioning pins 15 which are inserted into three positioning recesses 3 which are provided at the back surface of the outer base Mb are provided for positioning. Further, on the top surface of the setting table 13, four positioning blocks 16 for positioning use which hold the corner parts of the outer base Mb are provided.
Further, the substrate ease cleaning apparatus S, as shown in FIG. 1, FIG. 2, and FIG. 6A to FIG. 8E, is provided with a support table 20 which supports a substrate case C inside the booth 10 with the outer base Mb facing down in a state assembled to be able to be separated in the vertical direction. The support table 20 is provided at a movement mechanism 30. Specifically, as shown in FIG. 6A, at the center of the support table 20, a latch drive part 21 is provided which is inserted from the insertion hole 2 of the outer base Mb of the supported substrate case C and can lock and unlock the lock part 1. The latch drive part 21 is comprised of a rotatable disk which is provided with a plurality of latch pins 21a. An actuator 22 is provided which can rotate the disk of the latch drive part 21. Furthermore, at the outer periphery of the support table 20, three engagement projections 23 are provided which engage with the three engagement recesses 4 of the outer base Mb of the supported substrate case C. Furthermore, the support table 20 is provided with four air suction type suction disks 24 which hold by suction the outer base Mb of the supported substrate case C.
Further, as shown in FIG. 1, FIG. 2, and FIG. 7 to FIG. 8E, a movement mechanism 30 which the support table 20 is provided with opens the shutter 12 and moves the substrate case C which is placed on the setting table 13 to the support table 20 before cleaning the substrate case C and opens the shutter 12 and moves the substrate case C which is supported at the support table 20 to the setting table 13 after cleaning the substrate case C. This movement mechanism 30 is provided with a stand 31 which carries the support table 20. The stand 31 can move between two positions of an advance position R1 where it advances to the setting table 13 side to receive and deliver a substrate case C between the setting table 13 and the support table 20 and a retraction position R2 where it retracts inside the booth 10 to deliver and receive a substrate case C with the later explained conveyance mechanism. Further, the stand 31 can also be positioned at an initial position R3 further retracted from the retraction position R2. The movement mechanism 30 is provided with a rail 32 which supports this moving stand 31 to be able to move and an advance/retraction drive part 33 which is provided with for example a ball screw mechanism which makes the stand 31 move to the two positions of the advance position R1 and retraction position R2 and to the initial position R3.
The support table 20, as shown in FIG. 8B and FIG. 8C, is provided to be able to move up and down with respect to the stand 31 of the movement mechanism 30. The stand 31 is provided with an up-down drive part 34 which is comprised of an air cylinder apparatus which makes the support table 20 move up and down. The movement mechanism 30 makes the support table 20 rise at the advance position R1 to thereby make the engagement projections 23 of the support table 20 engage with the engagement recesses 4 of the substrate case C and hold the substrate case C by suction by the suction disks 24 and lift up the substrate case C. Further, the movement mechanism 30 can move the support table 20 through the opening 14 of the setting table 13 while lifting up the substrate case C. Further, the latch drive part 21 which is provided at the support table 20 locks and unlocks the lock part 1 when making the support table 20 rise at the advance position R1 of the stand 31 to make the engagement projections 23 of the support table 20 engage with the engagement recesses 4 of the substrate case C.
Furthermore, as shown in FIG. 1 to FIG. 3 and FIG. 9 to FIG. 15B, inside the booth 10, a first cleaning tank 40 which holds and cleans the parts of the outer base Mb and outer shell Ms of the outer pod M in the separated state and a second cleaning tank 50 which holds and cleans the parts of the inner base Nb and inner shell Ns of the inner pod N in the separated state are provided. The support table 20, the first cleaning tank 40, and the second cleaning tank 50 are arranged in series along one horizontal direction (Y-axis direction). Further, inside the booth 10, a conveyance mechanism 6 which conveys the parts of the outer pod M and the inner pod N of the substrate case C between the support table 20 and the corresponding first cleaning tank 40 and second cleaning tank 50 is provided.
In more detail, the first cleaning tank 40 is provided with a tank body 42 which has an opening 41 which opens upward and a lid 43 which can open and close to open the opening 41 of the tank body 42 when conveying the parts of the outer pod M of the substrate case C and close it when cleaning the parts. Further, as shown in FIG. 9, the first cleaning tank 40 is provided with a first rotating plate 44 which is provided at the bottom part of the tank body 42 to be able to rotate about the vertical direction axis, a first rotation drive part 45 which drives rotation of the first rotating plate 44, a plurality of (four) outer base support rods 46 which are provided standing up at the first rotating plate 44 and support parts of the outer edge of the outer bass Mb (in the embodiment, the four corner parts) at a predetermined height position, and a plurality of (four) outer shell support rods 47 which are provided standing up at the first rotating plate 44 and support parts of the outer edge of the outer shell Ms (in the embodiment, the four corner parts) at a predetermined height position different from the outer base support rods 46.
The outer base support rods 46 are set higher than the outer shell support rods 47 and support the outer base Mb at a position higher than the outer shell Ms. As shown in FIG. 9, the front end parts of the outer base support rods 46 and the outer shell 11 support rods 47 are provided with support members 48 which support the corner parts of the parts and with guide pins 49 which are provided at the lefts and rights of the support members 48 and guide the two sides of the corners of the parts. Further, the plurality of outer base support rods 46 and the plurality of outer shell support rods 47 of the first cleaning tank 40 are provided standing up at mutually different positions in the rotational direction. In the embodiment, as shown in FIG. 9 to FIG. 15B, the plurality of outer base support rods 46 and the plurality of outer shell support rods 47 are provided standing up offset in phase 45° in the rotation direction.
On the other hand, the second cleaning tank 50 is provided with a tank body 52 which has an opening 51 which opens upward and a lid 53 which can open and close to open the opening 51 of the tank body 52 when conveying the parts of the inner pod N of the substrate case C and close it when cleaning the parts. In FIG. 9, while the inside of the first cleaning tank 40 is shown, in the second cleaning tank 50 as well, the configuration is common with the first cleaning tank 40. For the corresponding parts, the reference numerals of the second cleaning tank 50 are provided in parentheses. As shown in FIG. 9, the second cleaning tank 50 is provided with a second rotating plate 5A which is provided at the bottom part of the tank body 52 to be able to rotate about the vertical direction axis, a second rotation drive part 55 which drives rotation of the second rotating plate 54, a plurality of (four) inner base support rods 56 which are provided standing up at the second rotating plate 54 and support parts of the outer edge of the inner base Nb (in the embodiment, the four corner parts) at a predetermined height position, and a plurality of (four) inner shell support rods 57 which are provided standing up at the second rotating plate 54 and support parts of the outer edge of the inner shell Ns (in the embodiment, the four corner parts) at a predetermined height position different from the inner base support rods 56.
The inner base support rods 56 are set higher than the inner shell support rods 57 and support the inner base Nb at a higher position than the inner shell Ns. As shown in FIG. 9, the front end parts of the inner base support rods 56 and inner shell support rods 57 are provided with support members 58 which support the corner parts of the parts and with guide pins 59 which are provided at the lefts and rights of the support members 58 and guide the two sides of the corners of the parts. Further, the plurality of inner base support rods 56 and the plurality of inner shell support rods 57 of the second cleaning tank 50 are provided standing up at mutually different positions in the rotational direction. In the embodiment, as shown in FIG. 9 to FIG. 15B, the plurality of inner base support rods 56 and the plurality of inner shell support rods are provided standing up offset in phase 45° in the rotation direction. Further, inside the first cleaning tank 40 and the second cleaning tank 50, a group of cleaning solution nozzles which eject a known cleaning solution and an air nozzle which ejects dry air for drying are provided.
Further, the present apparatus, as shown in FIG. 4, is provided with a later explained control part 100. The control part 100 is provided with the function of controlling the first rotation drive part 45 and setting the stop position of the outer base support rods 46 when supporting and releasing support of the outer base Mb and the stop position of the outer shell support rods 47 when supporting and releasing support of the outer shell Ms offset in phase. In the embodiment, as shown in FIG. 10A and FIG. 11A, the rods are offset in phase 45° in the rotational direction. This control part 100, in the same way, is provided with the function of controlling the second rotation drive part 55 and setting the stop position of the support rods of the inner base Nb when supporting and releasing support of the inner base Nb and the stop position of the inner shell support rods 57 when supporting and releasing support of the inner shell Ns offset in phase. In the embodiment, as shown in FIG. 12A and FIG. 13A, the rods are offset in phase 45° in the rotational direction.
Further, the support table 20 supports the substrate case C with the outer base Mb facing down at the support table 20, so the conveyance mechanism 60 conveys the outer shell Ms, inner shell Ns, inner base Nb, and outer base Mb in that order from the support table 20 to the insides of the respectively corresponding first cleaning tank 40 and second cleaning tank 50 before cleaning the substrate case C. Further, the conveyance mechanism 60 conveys the outer base Mb, inner base Mb, inner shell Ns, and outer shell Ms in that order from the insides of the corresponding first cleaning tank 40 and second cleaning tank 50 to the support table 20 after cleaning the substrate case C.
In more detail, the conveyance mechanism 60, as shown in FIG. 2, FIG. 3, FIG. 7, and FIG. 10A to FIG. 18B, is provided with a holding mechanism 61 which can respectively grip the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell Ns of the inner pod N, an elevation mechanism 62 which can make the holding mechanism 61 ascend and descend in the vertical direction (Z-axis direction), and a running movement mechanism 63 which makes the holding mechanism 61 move running in one horizontal direction (Y-axis direction). The control part 100 controls the drive operation of the holding mechanism 61, the elevation mechanism 62, and the running movement mechanism 63. Due to this, the support table 20, the first cleaning tank 40, and the second cleaning tank 50 are provided in series along one horizontal direction (Y-axis direction). The conveyance mechanism 60 can convey parts by just making the holding mechanism 61 move in the two axial directions of the vertical direction (Z-axis direction) and one horizontal direction (Y-axis direction) under the control of the control part 100. For this reason, the conveyance mechanism 60 can be made simpler in structure compared with a conventional arm robot and can easily separate and convey parts. Further, it need not take up as much space and enables space-saving.
As shown in FIG. 16A and FIG. 16B, the holding mechanism 61 is provided with a base plate 64. The elevation mechanism 62 is provided with an elevator rail 55 which supports the base plate 54 to be able to ascend and descend. A not shown drive part makes the base plate 64 ascend and descend to position it at a required position in the vertical direction (Z-axis direction). Further, the running movement mechanism 63 is provided with a horizontal rail 67 which supports the elevator rail 65 to be able to move in one horizontal direction (Y-axis direction) and is fastened to the stand 66. The running movement mechanism 63 uses a not shown drive part to make the elevator rail 65 move and position it at a required position in the one horizontal direction (Y-axis direction).
The holding mechanism 61, as shown in FIG. 3, FIG. 7, and FIG. 16A to FIG. 18B, is provided with a gripping hand 70 which is provided with a pair of hand units 71, 71 which can approach and move away from each other in the other horizontal direction (X-axis direction) perpendicular to the one horizontal direction (Y-axis direction) and a drive part 72 which makes the pair of hand units 71, 71 of the gripping hand 70 approach and move away from each other. The drive part 72, for example, is comprised of an air cylinder apparatus and is mounted on the base plate 64. The control part 100 controls the pair of hand units 71, 71 of the gripping hand 70 to make them individually grip the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell Ns of the inner pod N. The holding mechanism 61 grips the parts under the control of the control part 100 which makes the holding mechanism 61 move in the two axial directions of the one horizontal direction (Y-axis direction) and the vertical direction (Z-axis direction) for positioning and enables the gripping hand 70 to be moved in the other horizontal direction (X-axis direction). Further, the pair of gripping units 71, 71 are used to grip all of the parts, so the structure can be simplified. As shown in FIG. 16B, FIG. 17A, FIG. 17B, FIG. 18A, and FIG. 18B, the pair of hand units 71, 71 of the gripping hand 70 are formed with lock parts 73, 74, 75, and 76 which lock with corresponding shapes of grip parts of the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell. Ns of the inner pod N.
Further, in the substrate case cleaning apparatus S, the control part 100 controls the gripping hand 70 to stand by at the standby position Q (see FIG. 2). In the embodiment, the standby position Q is set at the side end part of the shutter 12 of the booth 10. Further, as shown in FIG. 1, FIG. 2, and FIG. 16A and FIG. 16B, a cleaning means 80 for cleaning the gripping hand 70 is provided. This cleaning means 80 is provided with a spray nozzle 81 which sprays gas to the gripping hand 70 near the standby position Q and an exhaust fan 82 which exhausts gas which was ejected from the spray nozzle 81 from the inside of the booth 10. As the gas, for example, air, nitrogen gas, etc. may be used.
Furthermore, in the substrate case cleaning apparatus S, as shown in FIG. 1 and FIG. 19, in the first cleaning tank 40, a holding part 90 is provided which can cover and hold the outside surface of a part which does not require cleaning when a part of at least one of the outer base Mb and outer shell Ms of the outer pod M (in the embodiment, the outer base Mb) does not have to be cleaned at the outside surface. The holding part 90 is provided at the back surface of the lid 43 of the first cleaning tank 40 and covers the outside surface of the outer base Mb, as the part not requiring cleaning, by the back surface of the lid 43. The holding part 90 is provided with three engagement projections 91 which engage with three engagement recesses 4 of the outer base MB which is held at the back surface of the lid 43. Further, the holding part 90 is provided with four suction disks 92 which hold the outside surface of the outer base Mb by suction at the back surface of the lid 43. Since the back surface of the lid 43 is utilized, the structure of the holding part 90 can be made simpler.
Further, the control part 100 is provided with the function of judging whether the outside surface of the outer base Mb of the outer pod M does not have to be cleaned and, when judging it does not have to be cleaned, conveying the outer base Mb by the conveyance mechanism 60 to the holding part 90. The control part 100 judges whether cleaning is unnecessary by programming which is performed in advance before cleaning the substrate case C relating to the cleaning or by detection of the model type or shape etc. of the substrate case C by a sensor. In the embodiment, it is performed by programming which is performed in advance before cleaning the substrate case C. Further, the control part 100 performs various control such as control of opening/closing operation of the above-mentioned shutter 12, control of the drive operation of the movement mechanism 30, control of the drive operation of the conveyance mechanism 60, control of the opening/closing operation of the lids 43 and 53 of the first cleaning tank 40 and the second cleaning tank 50, control of rotation of the rotating plates 44, 54, control of cleaning and drying, etc.
In the substrate case cleaning apparatus S according to this embodiment, the substrate case C is cleaned in the following way. The control part. 100 may be programmed in advance to judge if the outside surface of the outer base Mb of the outer pod M has to be cleaned before cleaning the substrate case C. Here, first, the case where the outside surface of the outer base Mb has to be cleaned will be explained. First, as shown in FIG. 8A, the substrate case C relating to cleaning is set at the setting table 13 by another conveyor etc. Before cleaning the substrate case C, as shown in FIG. 8B, the shutter 12 of the booth 10 is opened, the advance/retraction drive part 33 of the movement mechanism 30 makes the stand 31 advance together with the support table 20 from the initial position R3 to the advance position R1 and the substrate case C which is placed on the setting table 13 is received on the support table 20. At this time, as shown in FIG. 8C and FIG. 6B, at the advance position R1 of the stand 31, the up-down drive part 34 makes the support table 20 rise, makes the engagement projections 23 of the support table 20 engage with the engagement recesses 4 of the outer base Mb of the substrate case C, and lifts up the substrate case C. Further, the outer base Mb is held by suction by the suction disks 24. For this reason, the substrate case C is prevented from moving to the left or right or front or back and is reliably positioned on the support table 20. Furthermore, the latch pin 21a of the latch drive part 21 of the support table 20 is inserted into the insertion hole 2 of the outer base Mb.
Next, as shown in FIG. 8D, the advance/retraction drive part 33 of the movement mechanism 30 makes the stand 31 retract together with the support table 20 from the advance position R1 to the retraction position R2. In this case, since the setting table 13 is formed in a fork shape which has an opening part 14, the support table 20 moves through the opening 14 of the setting table 13 while lifting up the substrate case C and is positioned at the retraction position R2. In this case, the support table 20 itself is made to directly move to make the support table 20 receive the substrate case C, so compared with the case of making it move by an arm robot like in the past, the substrate case as a whole no longer has to be gripped and transfer of the substrate case C from the setting table 13 to the support table 20 is kept from becoming complicated and is simplified. Further, positioning of the substrate case C at the support table 20 also can be facilitated. In particular, it is possible to position and support a substrate case C, which is placed and positioned at a predetermined position of the setting table 13, at a predetermined position on the support table 20 by engagement of the engagement recesses 4 and engagement projections 23 and possible to improve the positioning precision. At this retraction position R2, as shown in FIG. 8E, the latch drive part 21 is driven and unlocked whereby the parts of the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell Ns of the inner pod N which are supported at the support table 20 can be detached. Further, the shutter 12 is made to close.
In this state, as shown in FIG. 1, the lids 43 and 53 of the first cleaning tank 40 and the second cleaning tank 50 are opened, the conveyance mechanism 60 is driven, and the support table 20 transfers the parts of the substrate case C to the conveyance mechanism 60. The conveyance mechanism 60 conveys the outer shell Ms, inner shell Ns, inner base Nb, and outer base Mb in that order from the support table 20 to the ins ides of the respectively corresponding first cleaning tank 40 and the second cleaning tank 50. The holding mechanism 61 grips the parts under the control of the control part 100 by making the holding mechanism 61 move in the two axial directions of one horizontal direction (Y-axis direction) and the vertical direction (Z-axis direction) for positioning and making the gripping hand 70 move in the other horizontal direction (X-axis direction). In this case, the pair of hand units 71, 71 of the gripping hand 70 can grip all parts. That is, the pair of hand units 71 of the gripping hand 70 are provided with lock parts 73, 74, 75, 76 which lock the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell Ns of the inner pod N corresponding to the shapes of the grip parts, so the grip on the parts becomes more reliable. FIG. 7, FIG. 10B, and FIG. 17A show the gripped state of the outer shell Ms, FIG. 11B and FIG. 17B show the gripped state of the outer base Mb, FIG. 12E and FIG. 18A show the gripped state of the inner shell Ns, and FIG. 13B and FIG. 18B show the gripped state of the inner base Nb.
In this case, the outer shell Ms and cuter base Mb are received at the first cleaning tank 40 in the following way. As shown in FIG. 10A and FIG. 10B, the control part 100 first drives rotation of the first rotating plate 44 and makes it stop at a predetermined rotation position so as to support the corner parts of the outer shell Ms by the outer shell support rods 47. In this state, the gripping hand 70 which grips the outer shell Ms descends inside the first cleaning tank 40, makes the outer shell Ms be supported by the outer shell support rods 47, then rises. In this case, the outer shell Ms is supported by the lower height outer shell support rods 47, so becomes positioned together with the gripping hand 70 lower than the higher height outer base support rods 46, but the outer base support rods 46 and the outer shell support rods 47 are placed at different positions in the rotational direction as each other, so it is possible to avoid interference with the higher height outer base support rods 46 and possible to reliably convey, support, and hold the outer shell Ms.
Next, as shown in FIG. 11A, the control part 100 drives rotation of the first rotating plate 44 and makes it stop at a predetermined rotation position so as to enable the corner parts of the outer base Mb to be supported by the outer base support rods 46. That is, the plurality of outer base support rods 46 and the plurality of outer shell support rods 47 are placed at different positions in the rotational direction as each other, that is, are offset in phase 45° in the rotation direction. The conveyance mechanism 60 can only make the holding mechanism 61 move in the two axial directions of one horizontal direction (Y-axis direction) and the vertical direction (Z-axis direction) and cannot change the orientation of the outer base Mb or the orientation of the gripping hand 70. However, it is possible to set the stop position of the outer base support rods 46 and the stop position of the support rods of the outer shell Ms different in phase and adjust the positions of the support rods with respect to the conveyance mechanism 60, so it is possible to reliably support the outer base Mb at the outer base support rods 46.
On the other hand, the inner shell Ns and inner base Nb are received at the second cleaning tank 50 in the following way. As shown in FIG. 12A and FIG. 12B, the control part 100 first drives rotation of the second rotating plate 54 and makes it stop at a predetermined rotation position so as to be able to support the corner parts of the inner shell Ms by the inner shell support rods 57. In this state, the gripping hand 70 which grips the inner shell Ns descends inside the second cleaning tank 50, makes the inner shell Ns be supported at the inner shell support rods 57, then rises. In this case, the inner shell Ns is supported at the lower height inner shell support rods 57, so is positioned together the gripping hand 70 lower than the higher height inner base support rods 56, but the inner base support rods 56 and the inner shell support rods 57 are placed at different positions in the rotational direction as each other, so it is possible to prevent interference with the higher height inner base support rods 56 and possible to reliably convey, support, and hold the inner shell Ns.
Next, as shown in FIG. 13A, the control part 100 drives rotation of the second rotating plate 54 and makes it stop at a predetermined rotational position so as to enable the corner parts of the inner base Nb to be supported by the inner base support rods 56. That is, the plurality of inner base support rods 56 and the plurality of inner shell support rods 57 are placed at different positions in the rotational direction as each other, that is, are offset in phase 45° in the rotation direction. The conveyance mechanism 60 can make the holding mechanism 61 move in only the two axial directions of one horizontal, direction (Y-axis direction) and the vertical direction. (Z-axis direction) and cannot change the orientation of the inner base Nb or the orientation of the gripping hand 70. However, it is possible to make the stopping position of the support rods 56 of the inner base and the stopping position of the support rods of the inner shell Ns different in phase and possible to adjust the positions of the support rods in the conveyance mechanism 60, so the inner base Nb can be reliably supported at the inner base support rods 56.
When the conveyance mechanism 60, as shown in FIG. 14A, FIG. 14B, and FIG. 15A and FIG. 15B, finishes conveying the outer shell Ms, inner shell Ns, inner base Nb, and outer base Mb in that order from the support table 20 to the insides of the respectively corresponding first cleaning tank 40 and the second cleaning tank 50, as shown in FIG. 2, the gripping hand 70 is made to stand by at the standby position Q. Further, as shown in FIG. 1, in the first cleaning tank 40 and the second cleaning tank 50, the lids 43, 53 are closed and the parts of the outer pod M and the inner pod N are cleaned. In this case, the outer pod M and the inner pod N are cleaned by separate cleaning tanks 40, 50, so it is possible to prevent the contaminant which sticks to the outer pod M which is exposed to the outside air from causing secondary contamination of the inner pod N and therefore possible to improve the cleaning precision.
Further, as shown in FIG. 15A and FIG. 15B, in the first cleaning tank 40, the outer base support rods 46 and the outer shell support rods 47 support the parts at different predetermined height positions, so in the tank body 42, the outer base Mb and outer shell Ms are exposed at their outer surfaces and inner surfaces and are held separated from each other. For this reason, when cleaning, the cleaning solution evenly reaches the outer base Mb and the outer shell Ms and enables reliable cleaning. On the other hand, as shown in FIG. 14A and FIG. 14B, in the second cleaning tank 50 as well, the inner base support rods 56 and the inner shell support rods 57 support the parts at different predetermined height positions, so inside the tank body 52, the inner base Nb and inner shell Ns are exposed at their outer surfaces and inner surfaces and are held separated from each other. For this reason, when cleaning, the cleaning solution evenly reaches the inner base Nb and inner shell Ns and enables reliable cleaning. That is, when cleaning like in the past with one part attached to the lids 43, 53, it was hard for the cleaning solution to sufficiently reach the part attached to the lids 43, 53, in particular the surface at the lid 43, 53 side, but with the con figuration of the present invention, the parts can be cleaned separated inside the tank bodies 42, 52, so it becomes possible to make the cleaning solution evenly reach the parts and reliably perform the cleaning.
In the cleaning of the parts of the outer pod M and the inner pod N, the gripping hand 70 at the standby position Q is sprayed with gas from the spray nozzle 81 of the cleaning means 80 whereby the gripping hand 70 is cleaned. The gripping hand 70 sometimes is contaminated by transfer of contaminant which sticks to the parts due to gripping of the parts, but can be cleaned by spraying gas from this spray nozzle 81. For this reason, when the gripping hand 70 grips and conveys the cleaned parts, it is possible to prevent the cleaned parts from ending up being contaminated again. Further, the gripping hand 70 is cleaned during cleaning of the parts, so it is possible to clean it each time cleaning the parts and possible to reliably prevent contamination of the parts after cleaning. Further, the spray nozzle 81 sprays gas to remove contaminant which sticks to the gripping hand 70, so it is possible to reliably remove the contaminant. Furthermore, the removed contaminant is exhausted by an exhaust fan 82 to the outside of the booth 10, so it is possible to hold the booth 10 clean at all times.
When the parts of the outer pod M and the inner pod N finish being cleaned, in accordance with a process reverse to the above, first the lids 43 and 53 of the first cleaning tank 40 and the second cleaning tank 50 are opened, then the conveyance mechanism 60 is used to convey the outer base Mb, inner base Nb, inner shell Ns, and outer shell Ms in that order from the insides of the first cleaning tank 40 and the second cleaning tank 50 to the support table 20 where they are assembled. The holding mechanism 61 grips the parts, as explained above, under the control of the control part 100 by making the holding mechanism 61 move in the two axial directions of one horizontal direction (Y-axis direction) and the vertical direction (Z-axis direction) to position it and making the gripping hand 70 move in the other horizontal direction (X-axis direction). In this case, the pair of hand units 71, 71 of the gripping hand 70 can grip all of one parts. Further, the pair of hand units 71, 71 of the gripping hand 70 are provided with lock parts 73, 74, 75, 76 which lock corresponding shapes of the grip parts of the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell Ns of the inner pod N, so the grip on the parts becomes more reliable.
In this case, the outer base Mb and outer shell Ms are taken out from the first cleaning tank 40 in the following way. The control part 100 first, as shown in FIG. 11A, drives rotation of the first rotating plate 44 and makes it stop at a predetermined rotation position so as to enable the outer base Mb to be gripped by the gripping hand 70. In this state, the gripping hand 70 descends, grips the outer base Mb, then rises. Next, the control part 100, as shown in FIG. 10A, drives rotation of the first rotating plate 44 and makes it stop at a predetermined rotation position so as to enable the outer shell Ms to be gripped by the gripping hand 70. That is, the plurality of outer base support rods 46 and the plurality of outer shell support rods 47 are placed at different positions in the rotational direction as each other, that is, are offset in phase 45° in the rotation direction. In this state, the gripping hand 70 descends, grips the outer shell Ms, then rises. In this case, since the outer shell Ms is supported by the lower height outer shell support rods 47, it rises together with the gripping hand 70 from a position lower than the higher height outer base support rods 46, but the outer base support rods 46 and the outer shell support rods 47 are placed at different positions in the rotational direction as each other, so it is possible to prevent interference with the higher height outer base support rods 46 and possible to reliably take out the outer shell Ms.
On the other hand, the inner base Nb and inner shell Ns are taken out from the second cleaning tank 50 in the following way. The control part 100 first, as shown in FIG. 13A, drives rotation of the second rotating plate 54 and makes it stop at a predetermined rotational position so as to grip the inner base Nb by the gripping hand 70. In this state, the gripping hand 70 descends and grips the inner base Nb, then rises. Next, the control part 100, as shown in FIG. 12A, drives rotation of the second rotating plate 54 and makes it stop at a predetermined rotational position so as to grip the inner shell Ns by the gripping hand 70. That is, the plurality of inner base support rods 56 and the plurality of inner shell support rods 57 are placed at different positions in one rotational direction as each other, that is, are offset in phase 45° in the rotation direction. In this state, the gripping hand 70 descends and grips the inner shell Ns, then rises. In this case, the inner shell Ns is supported by the lower height inner shell support rods 57 and rises together with the gripping hand 70 from a lower position than the higher height inner base support rods 56, but the inner base support rods 56 and the inner shell support rods 57 are placed at different positions in the rotational direction as each other, so it is possible to avoid interference with the higher height inner base support rods 56 and possible to reliably take out the inner shell Ns.
The outer base Mb, inner base Nb, inner shell Ns, and outer shell Ms which were taken out in order from the cleaning tanks 40, 50 in this way are assembled by the reverse process on the support table 20 and supported as the substrate case C on the support table 20 (see FIG. 8E). In this state, the latch drive part 21 is driven whereby the substrate case C is locked and the parts of the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell Ns of the inner pod N are rendered undetachable. Further, the shutter 12 of the booth 10 is opened, then the advance/retraction drive part 33 of the movement mechanism 30 makes the stand 31 advance together with the support table 20 from the retraction position R2 to the advance position R1 and transfer the substrate case C on the support table 20 to the setting table 13 (see FIG. 8D and FIG. 8C). In this case, the stand 31 is made to advance together with the support table 20 to the advance position R1, but the setting table 13 is formed in a fork shape which has an opening part 14, so the support table 20 moves through the opening of the setting table 13 while lifting up the substrate case C and is positioned at the advance position R1. At this advance position R1, the up-down drive part 34 makes the support table 20 descend and detaches the engagement projections 23 of the support table 20 from the engagement recesses 4 of the substrate case C to place the substrate case C on the setting table 13 (see FIG, 8B). In this case, the support table 20 is directly moved to make the support table 20 receive and deliver the substrate case C, so compared with the case of making it move by an arm robot like in the past, the substrate case as a whole no longer has to be gripped and transfer from the setting table 13 to the support table 20 is kept from becoming complicated and is simplified. Further, positioning at the setting table 13 also can be facilitated. Further, the support table 20 retracts to the initial position R3. In this state, the substrate case C is conveyed elsewhere from the setting table 13.
Next, the case where the outside surface of the outer base Mb does not need to be cleaned will be explained. In this case, the control part 100 is programmed in advance with the lack of need of cleaning the outside surface of the outer base Mb of the outer pod M. In the same way as the above, the parts of the outer base Mb and outer shell Ms of the outer pod M and the inner base Nb and inner shell Ns of the inner pod N which are supported at the support table 20 are conveyed by the conveyance mechanism 60. At this time, as shown in FIG. 1 and FIG. 19, the final outer base Mb is held at the holding part 30 which is provided at the back surface of the lid 43 of the first cleaning tank 40. In this case, the engagement projections 91 of the holding part 90 are engaged with the engagement recesses 4 of the outer base Mb and the outer base Mb is held by suction by the suction disks 92. For this reason, the outer base Mb is kept from moving right or left or front or back and can be reliably held at the holding part 90.
In this state, the lid 43 is closed and the cleaning is performed. In this case, the outside surface of the outer base Mb is covered, so the inside surface is reached by the cleaning solution and cleaned, but the cleaning solution is kept from penetrating to the outside surface and therefore cleaning there is not necessary. For this reason at the outside surface of the outer base Mb, there are positioning holes and a lock part 1 which locks the assembly of parts etc. If cleaned, the cleaning solution ends up penetrating these and causing the drying to take tremendous time. If allowed to stand in a not dried state, mold will form at the inside and other detrimental effects will result in some cases, but cleaning is not performed, so these detrimental effects can be avoided.
Furthermore, in the above embodiment, the case of supporting the substrate case C on the support table 20 with the outer base Mb facing down was shown, but the invention is not necessarily limited to this. It is also possible to support the support table 20 on the substrate case C with the outer shell Ms facing down and convey the outer base Mb, inner base Nb, inner shell Ns, and outer shell Ms in that order from the support table 20 to the insides of the corresponding first cleaning tank 40 and second cleaning tank 50 before cleaning the substrate case C and convey the outer shell Ms, inner shell Ns, inner base Nb, and outer base Mb in that order from the inside of the first cleaning tank 40 and the second cleaning tank 50 to the support table 20 for assembly after cleaning the substrate case C and possible to make other suitable changes.
Further, in the embodiment, the present invention is applied to a substrate case C of a two-layer structure which is provided with an inner pod N which is comprised of an inner base Nb and inner shell Ns and an outer pod M which is comprised of an outer base Mb and outer shell Ms, but it is not necessarily limited to this. It may also be applied to a single layer structure comprised of a base and shell like in the past and may be otherwise suitably changed.
REFERENCE SIGN LIST
S substrate case cleaning apparatus
C substrate Case
N Inner pod
Nb inner base
Ns inner shell
M outer pod
Mb outer bass
Ms outer shell
D substrate
1 lock part
2 insertion hole
3 positioning recess
4 engagement recess
10 booth
11 opening
12 shutter
13 setting table
14 opening part
15 positioning pin
16 positioning block
20 support table
21 latch drive part
23 engagement projection
24 suction disk
30 movement mechanism
31 stand
R1 advance position
R2 retraction position
R3 initial position
32 rail
33 advance/retraction drive part
34 up-down drive part
40 first cleaning tank
41 opening
42 task body
43 lid
44 first rotating plate
45 first rotation drive part
46 outer base support rod
47 outer shell support rod
4B support member
49 guide pin
50 second cleaning tank
51 opening
52 tank body
53 lid
54 second rewriting plate
55 second rotation drive part
56 inner base support rod
57 inner shell support rod
58 support member
59 guide pin
60 conveyance mechanism
61 holding mechanism
62 elevation mechanism
63 run ruing movement mechanism
64 base plate
65 elevator rail
66 stand
67 horizontal rail
70 gripping hand
71 hand unit
72 drive part
73, 74, 75, 76 lock parts
80 cleaning means
O standby position
81 spray nozzle
82 exhaust fan
90 holding part
91 engagement projection
92 suction disk
100 control part

## Claims

1. A substrate case cleaning apparatus which is configured to clean, in a state with no substrate, a substrate case comprising with a base and a shell which covers said base and is configured to hold a substrate inside it,
said substrate case cleaning apparatus comprising:
a booth which forms a clean space,
a cleaning tank which is provided inside the booth and holds and cleans parts in the base and shell of the substrate case in a separated state is capable of holding and cleaning parts of the inner base and inner shell of the inner pod in a separated sate,
a conveyance mechanism which grips the parts of the substrate case by a gripping hand and conveys them to the cleaning tank, and
a cleaning means for making the gripping hand stand by at a standby position in the booth during cleaning of the substrate case and cleaning the gripping hand during cleaning of the parts.

2. The substrate case cleaning apparatus according to claim 1 wherein said cleaning means has a spray nozzle which sprays a gas to said gripping hand and an exhaust fan which exhausts the gas which was sprayed from said spray nozzle from the inside of said booth.