Abstract:
A vacuum treating device, comprising a treatment container having a container body ( 111 ) and a lid ( 112 ) and allowing an internal pressure to be reduced and a lid support mechanism ( 130 ), wherein an upper opening ( 111   a ) formed in the container body can be closed airtight by the lid ( 112 ). The lid support mechanism ( 130 ) opens and closes the upper opening ( 111   a ) of the container body by moving the lid ( 112 ) so as to be translatingly moved in the vertical direction and, when the lid ( 112 ) is moved upward from the container body ( 111 ), supports the lid ( 112 ) so as to be rotated around a vertical axis disposed around the lid.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention relates to a vacuum processing apparatus having a lid-attached processing vessel for use in a film forming process of, e.g., semiconductor substrate.  
       BACKGROUND OF THE INVENTION  
       [0002]     Conventionally, a vacuum processing apparatus has been used for performing on a semiconductor substrate, an LCD substrate or the like, various processes such as film forming process, etching, ashing, heat treatment and the like, under a depressurized atmosphere. In such an apparatus, a processing vessel for performing vacuum processing includes a vessel main body having an upper opening, and a lid attached to the vessel main body to be opened or closed. Further, as for this kind of apparatus, it has been known that a lid is rotatably attached to the vessel main body around the horizontal axis line through a hinge or the like.  
         [0003]     For example, an opening/closing lid hinge mechanism of a vacuum processor has been known, wherein a gear mechanism is configured to open or close a lid around a horizontal axis line along a longitudinally elongated elliptic path (for example, see Japanese Patent Laid-open application No. H11-101345 (particularly, FIG. 2)). By this mechanism, the lid can be opened or closed without being overhung at the outside of the vessel main body.  
         [0004]     Further, a vacuum processor including a slide mechanism for horizontally sliding a lid and a rotation mechanism for rotating the lid around the horizontal axis line has been known (for example, see Japanese Patent Laid-open Application No. 2001-185534 (particularly FIG. 6)). By using this mechanism, maintenance becomes easier, and at the same time, attaching or detaching a heavy object to or from the lid can be readily carried out.  
         [0005]     However, in the former technology, a complicated mechanism needs to be provided to track the longitudinally elongated elliptic path during the opening or closing operation. Further, multiple or large-scale mechanism(s) need to be disposed around the lid to perform the sliding or rotational operation. Accordingly, the processor becomes expensive and large sized.  
         [0006]     Still further, in these technologies, since the lid is rotated around the horizontal axis line to fully open the vessel main body, such a configuration cannot be adopted that a part of the processor (e.g., source material supply system) is disposed above the lid. As a result, not only is the foot print of the processor increased, the capability to maintain it is also undermined.  
         [0007]     Still further, recently, there is a demand for a vacuum processing apparatus, wherein a source gas is produced by vaporizing a liquid source material or sublimating a solid source material, and is then supplied into a processing vessel. In this kind of apparatus, the conductance of a line provided between the source material vessel and the processing vessel has to be increased to ensure a supply amount of source gas, or to smoothly supply the source gas into the processing vessel. For this, the line provided between the source material vessel and the processing vessel must have a large diameter and short in length. However, in the configuration of the conventional apparatus, the line provided between the source material vessel and the processing vessel could not be made short.  
         [0008]     Further, in the aforementioned technologies, since the lid is rotated around the horizontal axis line, if the source material vessel is fixed on the lid, the source material vessel will be tilted and thus, the source material accommodated therein is also tilted and cause other changes on the source material. Accordingly, a proper supply amount of source material cannot be achieved.  
       SUMMARY OF THE INVENTION  
       [0009]     It is, therefore, an object of the present invention to provide a vacuum processing apparatus of simple configuration that can be configured at low cost, wherein other component part, such as source material supply system and the like, may be disposed above the lid.  
         [0010]     Further, it is an object of the present invention to provide a vacuum processing apparatus capable of having a short pipeline distance between a source material vessel and a processing vessel.  
         [0011]     Still further, it is an object of the present invention to provide a vacuum processing apparatus capable of realizing such a configuration where the state of source material is not changed by opening or closing of the lid.  
         [0012]     In accordance with a preferred embodiment of the present invention for achieving the aforementioned objects, there is provided a vacuum processing apparatus including: a processing vessel whose inside can be depressurized, the processing vessel including a vessel main body having an upper opening and a lid for airtightly closing the upper opening of the vessel main body; and a lid support mechanism for opening or closing the upper opening of the vessel main body by moving the lid, wherein the lid support mechanism allows the lid to be translated in a vertical direction, and to be rotated around a vertical axis line disposed at a peripheral position of the lid when the lid is elevated from the vessel main body.  
         [0013]     In this way, the lid is translated upward and then rotated around the vertical axis line, to thereby be dislocated from the vessel main body. Therefore, the upper opening of the vessel main body can be opened. Here, since the lid is translated upward and then rotated around the vertical axis line, other component part may be disposed at a position above the lid, which was dead space conventionally. Further, the lid support mechanism may be formed of supporting structure, which is installed coaxially on the vertical axis line, so that the configuration thereof need not be complicated and large sized. Still further, since the processing vessel can be opened while maintaining the lid&#39;s orientation at horizontal position, the source material therein may not be affected when the processing vessel is opened, even in case where the source material vessel is fixed on the lid.  
         [0014]     Meanwhile, same as in the conventional art, if the lid is opened around the horizontal axis line, it is largely rotated upward, and thus, it being tilted or reversed. For the same reason, it is impossible to dispose a part of the processor above the lid, or to fix the source material vessel on the lid.  
         [0015]     Further, it can be configured such that if the lid is not elevated at a predetermined height, it is not allowed to rotate. By doing this, the vessel main body or the lid can be prevented from being damaged due to erroneous manipulation.  
         [0016]     In the present invention, the lid support mechanism may be configured to maintain the lid at a predetermined height while the lid is rotated. By doing this, a height-maintaining operation of the lid becomes unnecessary during the rotation thereof, so that it is possible to carry out the rotating operation safely and more readily.  
         [0017]     In the present invention, the lid support mechanism may have a supporting member for supporting the lid directly or indirectly, wherein the supporting member is extended substantially horizontally above the lid from the vicinity of the vertical axis line. Therefore, it is possible to maintain the pose or position of the lid with high accuracy.  
         [0018]     In the present invention, a lifting unit for upwardly lifting the lid may be further included. By using this, in case of elevating the lid, it is possible to carry out such an elevating operation with small force, and thus, more easily.  
         [0019]     In the present invention, a source material vessel, disposed above the lid, for accommodating therein a source material supplied into the processing vessel may be further included. In this way, the pipeline distance between the source material vessel and the processing vessel can be short, and at the same time, the diameter of line can be large without increasing the foot print. Thus, the conductance of line between the source material vessel and the processing vessel can be large. For the same reason, in case where the source gas obtained by vaporizing the liquid source material or sublimating the solid source material is supplied into the processing vessel, the amount of source gas to be supplied can be ensured sufficiently. Further, the source gas can be prevented from being changed while supplying it, so that high quality processing can be performed.  
         [0020]     In the present invention, it is preferred that the source material vessel is immovably disposed with respect to the lid. By doing this, for example, the supply line between the source material vessel and the lid can be configured to be fixed, and therefore, the apparatus may have more simple configuration.  
         [0021]     Further, a source material supply line for supplying a source material from an upper portion of the lid into the processing vessel through the lid may be included. By using this, the lid is maintained at the horizontal position during the opening or closing operation thereof, so that the source material supply line may be connected to the lid without causing any problems. Hence, the source material supply line may be fixed to the lid, and further, the position thereof is not changed.  
         [0022]     In this case, a gas supply line extended through the lid to the upper portion thereof and connected to the source material supply line may be further included.  
         [0023]     Further, the vacuum processing apparatus may include any apparatus, which performs any processings at the state where the processing vessel is depressurized. For example, film forming apparatus such as CVD, etching apparatus such as dry etching, ashing apparatus such as plasma asher, heat treating device such as annealing furnace, etc., may be enumerated. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0024]      FIG. 1  offers a schematic view showing a preferred embodiment of a vacuum processing apparatus in accordance with the present invention;  
         [0025]      FIG. 2  provides a plane perspective view of the apparatus described in  FIG. 1 ;  
         [0026]      FIG. 3  is a cross sectional view showing main parts of an opening/closing supporting unit in the apparatus described in  FIG. 1 ; and  
         [0027]      FIG. 4  presents a perspective view schematically showing line configuration of the apparatus described in  FIG. 1 . 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0028]     A Preferred embodiment of a vacuum processing apparatus in accordance with the present invention will be described in detail with reference to the accompanying drawings.  
         [0029]      FIG. 1  is a schematic view showing an overall configuration of a vacuum processing apparatus  100  in accordance with the present embodiment. The vacuum processing apparatus  100  includes a processing vessel  110 , a source material supply system  120 , a lid support mechanism  130  and a gas exhaust system  140 .  
         [0030]     The processing vessel  110  contains a vessel main body  111  having an upper opening  111   a,  and a lid  112  for hermetically closing the upper opening  111   a  of the vessel main body  111 .  
         [0031]     Further, in the vessel main body  111 , a processing table  113  for supporting thereon an object to be processed, such as semiconductor wafer or the like (not shown), is disposed. A source material discharging head (shower head) for discharging a source material (source gas) into the processing vessel  110  is installed at a bottom surface of the lid  112 .  
         [0032]     The source material supply system  120  is disposed above the lid  112 . The source material supply system  120  includes a source material supply box  121  having a source material vessel  122  accommodating therein a source material (liquid or solid in the present embodiment) and a source material supply line  123  for supplying a source material (source gas in the present embodiment), which is connected to the source material vessel  122 . Further, a control unit  120 A for controlling the source material supply status may be installed in the source material supply system  120 .  
         [0033]     The source material supply line  123  is connected to a discharging head  112 A through the lid  112 . A source material replacement valve  123   a  and a source material supply valve  123   b  are provided in the source material supply line  123 . Further, a gas discharge line  124  is connected to the source material supply line  123 . A discharge valve  124   a  is installed in the gas discharge line  124 . The gas discharge line  124  penetrates the lid  112  and the vessel main body  111  to communicate with the outside of the vessel main body  111 . Further, one or more gas supply line(s)  125  is (are) connected to the source material supply line  123 . A gas supply valve  125   a  is installed in the gas supply line  125 .  
         [0034]     The gas supply line  125  involves supplying carrier gas or cleaning gas for cleaning each line or processing vessel. As schematically shown in  FIG. 4 , the gas supply line  125  is introduced from the outside into the vessel main body  111 , and penetrates the lid  112  to be introduced into the source material supply box  121 , to thereby be connected to the source material supply line  123 . Further, in  FIG. 4 , the lid support mechanism  130  and others as well as valves of respective lines are properly omitted.  
         [0035]     Returning again to  FIG. 1 , a lid support member  131  is disposed above the lid  112 . The lid support member  131  supports the lid  112  directly or indirectly. The lid support member  131  is connected to a driving member  132 , which is rotatably supported with respect to a shaft  133  inserted therein. More specifically, as shown in  FIG. 3 , a bearing  132   a,  e.g., cross roller bearing or the like, is interposed between the driving member  132  and the shaft  133 , and the driving member  132  is configured to be fixed along the direction of axis line while it is to be rotated around the axis line, with respect to the shaft  133 .  
         [0036]     The axis line (vertical axis line) of the shaft  133  is disposed at a peripheral position of the lid  112  (position other than the center), e.g., right outside the lid  112  in the present embodiment.  
         [0037]     The shaft  133  is elevatably supported with respect to a fixed member  134  fixed on the vessel main body  111 . To be more specific, as shown in  FIG. 3 , the fixed member  134  has a guide unit  134   a,  e.g., ball spline or the like, for fixing the shaft  133  so that it can be moved along the direction of the axis line but cannot be rotated around the axis line.  
         [0038]     As mentioned above, the lid support mechanism  130  allows the lid  112  to be translated in the normal direction to the vessel main body  111 , and be rotated around the vertical axis line disposed at the peripheral position of the lid  112 .  
         [0039]     At a lower portion of the fixed member  134 , a lifting unit  135  for upwardly moving the shaft  133  is installed. As described in  FIG. 3 , the lifting unit  135  applies lifting force to the shaft  133  by using a resilient member  135   a,  e.g., constant force spring or the like. Further, the lid  112  is configured to be readily elevated by the lifting unit  135 .  
         [0040]     In the present embodiment, the source material supply box  121  is upwardly supported by the lid support member  131 . Further, the lid  112  is supported by brackets  138  attached to the source material supply box  121 .  FIG. 2  illustrates such a state in detail.  FIG. 2  shows a top view of the vacuum processing apparatus  100 , and at the same time, perspective views of the source material supply box  121  and the lid  112 .  FIG. 2  basically shows a state where the vessel main body  111  is closed by the lid  112 ; and at the same time, it shows as a dashed double-dotted line a state where the lid  112  is opened (rotated state).  
         [0041]     Here, plural (three in the drawing) brackets  138  are provided to support the lid  112 , which is suspended from the source material supply box  121 . As mentioned above, in this embodiment, the lid support member  131  indirectly supports the lid  112  through the source material supply box  121  and the brackets  138 .  
         [0042]     At the lid support member  131 , plural horizontal position adjusting mechanisms  139  formed of positioning screws, dial gauge and the like are installed. By these horizontal position adjusting mechanisms  139 , the lid  112  supported indirectly by the lid support member  131  as described above can be positioned in the horizontal direction. To be more specific, position or direction of the lid  112  on a the horizontal plane can be adjusted by the plural horizontal position adjusting mechanisms, which carry out positioning at various positions in the horizontal direction (in the drawing, two horizontal position adjusting mechanisms ( 139 , 139 ), which perform positioning in different directions normal to each other).  
         [0043]     Further, at the lid support member  131 , plural vertical position adjusting mechanisms  131   a  for adjusting the vertical position of the lid  112  are installed. The height of the lid  112  may be adjusted by these vertical position adjusting mechanisms  131   a.  Moreover, the height of the lid  112  is adjusted by using the plural vertical position adjusting mechanisms  131   a,  which are separated from each other in the horizontal direction, so that the inclination level of the lid  112  is adjusted.  
         [0044]     To be more specific, each of the vertical position adjusting mechanisms  131   a  attached to the lid support member  131  is configured to adjust the height of the source material supply box  121  with respect to the lid support member  131 , and thus, adjusting the height of the lid  112  indirectly.  
         [0045]     At the lid support mechanism  130 , a rotation lock unit (plunger)  132   c  for fixing the rotation of the lid  112  is installed. The rotation lock unit (plunger)  132   c  fixes the driving member  132  and the shaft  133  in the rotation direction all the time, and such locked state is released by performing a predetermined operation (e.g., unloading operation).  
         [0046]     Further, there is installed a raised position keeping unit for keeping the lid  112  at a raised position of predetermined height when the lid  112  is elevated from the vessel main body  111 . As described in  FIG. 1 , the raised position keeping unit includes a supported material  137  (in the drawing, corresponding to a rotatably supported roller), which is attached to the driving member  132  through a fitting member  136 ; and a supporting surface  134   b  (a top surface of the fixing member  134 ) for upwardly supporting the supported material  137 .  
         [0047]     As shown by the solid line in  FIG. 2 , in the state where the lid  112  is disposed on the vessel main body  111  (the upper opening  111   a  of the vessel main body  111  is closed or it is disposed at a raised position right above the vessel main body  111 ), the supported member  137  is not supported by the supporting surface  134   b  in the side of the fixing member  134 . Contrary to this, if the lid  112  disposed at the raised position is rotated by a predetermined angle in the horizontal direction, the supported member  137  reaches to the supporting surface  134   b  of the fixing member  134 . In such a state, if the lid  112  is further rotated in the horizontal direction, the supported member  137  moves on the supporting surface  134   b  (while rotating, in case of a roller).  
         [0048]     As mentioned above, since the supported member  137  is supported on the supporting surface  134   b,  the lid  112  is supported at a predetermined height during the rotation thereof. Further, a stepped portion  134   c  is formed in the supporting surface  134   b  to confine the rotation range of the lid  112 .  
         [0049]     Here, if the lid  112  tends to rotate when it is not elevated at a predetermined height, the supported material  137  will contact the side of the fixing member  134 . Accordingly, even though the rotation lock unit  132   c  is not provided or the rotation lock unit  132   c  is released, it is possible to control the lid  112  not to rotate if it does not reach a predetermined height.  
         [0050]     As shown in  FIG. 2 , the aforementioned gas exhaust line  124  and the gas supply line  125  are respectively opened around the upper opening  111   a  on the top surface of the vessel main body  111 . The gas exhaust line  124  is connected to the gas exhaust system  140  shown in  FIG. 1 . Further, in the gas exhaust system  140 , a gas exhaust unit such as a turbo molecular pump  143 , a dry pump  144  or the like is installed. Still further, a bypass line  142  or valve  141   a  or  142   a  may be disposed, if necessary. Still further, the gas supply line  125  is to introduce from the processing vessel  110  into the source material supply box  121  through the lid  112  various gases, which have been supplied into the processing vessel  110  from the outside.  
         [0051]     In the following, operation and effect of the vacuum processing apparatus  100  as configured above will be explained.  
         [0052]     When the processing vessel  110  is opened in the vacuum processing apparatus  100 , first, the lid  112  is elevated from the vessel main body  111  manually or by using any driving source (electric motor, fluid pressure cylinder, etc.). At this time, the rotation of the lid  112  is controlled by control structure such as the rotation lock unit  132   c,  the supported material  137  or the like, until the lid  112  is disposed at a predetermined height. Accordingly, it is possible to carry out safe and easy manipulation in case of performing, e.g., manual operation. Further, at this time, the lid  112  can be elevated, i.e., translated upward while being supported and basically maintaining its orientation (at horizontal position).  
         [0053]     If the lid  112  is elevated to a predetermined height, it is rotated around the shaft  133  (vertical axis line), and thus, being dislocated from the vessel main body  111  in the horizontal direction as described in  FIG. 2 . At this time, since the supported member  137  is placed and supported on the supporting surface  134   b  of the fixing member  134 , the height of rotating lid  112  is kept during the rotation thereof even though it is not supported.  
         [0054]      FIG. 2  shows as a dashed double-dotted line a state where the lid  112  is fully opened. In such a state, the lid  112  and the source material supply box  121  are not disposed above the vessel main body  111 , so that maintenance (cleaning or repair of equipment) of the processing vessel  110  can be performed very easily.  
         [0055]     In the vacuum processing apparatus  100  of the present embodiment, the source material supply system  120  is disposed at a position right above the lid  112 , which was dead space conventionally. Therefore, the overall apparatus can be made compact. Further, it is possible to directly supply the source material into the processing vessel  110  from the upper portion, to thereby shorten the source material supply line while increasing the line&#39;s conductance. Hence, the amount of source material to be supplied can be maintained steadily, and at the same time, the source material can be prevented from being changed while supplying it. Accordingly, the processing can be performed by using various source materials smoothly.  
         [0056]     To be more specific, in case where the source gas is discharged from the source material vessel  122  by vacuum-exhaustion of the processing vessel  110  by the gas exhaust system  140 , if conductance of the source material supply line  123  is low, the amount of source gas to be supplied cannot be kept or the source gas may be changed in the supply line. However, in the present embodiment, it is possible to avoid such a problem by increasing conductance of the source material supply line  123 .  
         [0057]     Particularly, in the present embodiment, since the source material supply system  120  is fixed on the lid  112 , the lid  112  and the source material supply system  120  can be rigidly coupled to each other. Accordingly, the configuration can be simplified, and at the same time, the source gas can be prevented from being contaminated. Further, in the present embodiment, in case of performing vacuum-exhaustion of source material vessel  122  or various lines, vacuum level may be increased.  
         [0058]     For example, if the source material is solid, it is sublimated to produce source gas, which is supplied into the processing vessel  110 . In this case, it may be difficult to maintain the amount of source gas to be supplied, depending on the characteristics of the source material. However, in the present embodiment, the length of source material supply line  123  can be reduced, and the diameter of line can be large without interfering with surrounding structures. For the same reason, the amount of source gas to be supplied can be ensured, and thus, the processing can be performed smoothly.  
         [0059]     Further, when vaporizing liquid source material other than organic metal and supplying it from the supply line  123  into the processing vessel  110 , if the conductance of supply line  123  is small, the source material may be liquefied or decomposed in the line. If the liquefied or decomposed product is supplied into the processing vessel, the processing quality may be degraded. However, in the present embodiment, since the conductance of supply line is increased, the source material supply condition can be improved and high quality processing can be performed.  
         [0060]     In the present embodiment, since the position of the lid  112  is not changed during the opening or closing thereof, the source material vessel  122  can be disposed above the lid  112  without causing any problem. Further, even though the lid  112  and the source material vessel  122  are fixed to each other, the status of source material accommodated in the source material vessel  122  is not changed, i.e., the source material is not tilted in the source material vessel  122 , since the position of the source material vessel  122  is not changed. Therefore, the supply amount of source material and the supply status may be stabilized.  
         [0061]     In the present embodiment, the length of the source material supply line  123  may be set in the range of 30˜100 cm, and practically, about 70˜80 cm. Further, the line diameter may be configured in the range of 20˜80 mm, and preferably, large diameter of 30˜50 mm may be employed.  
         [0062]     In the present embodiment, the vacuum processing apparatus has a depressurized processing vessel, in which any processings may be carried out. As for the vacuum processing apparatus, film forming apparatus such as CVD, etching apparatus such as dry etching, ashing apparatus such as plasma asher, heat treating device such as annealing furnace or the like, may be enumerated.