Patent Publication Number: US-2007111651-A1

Title: Air passage opening/closing system

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to an air passage opening/closing system opening and closing an air passage by a film-shaped member (film door) and suitable for use in a vehicle air-conditioning system.  
      2. Description of the Related Art  
      In the past, an air passage opening/closing system using this type of film-shaped member to open and close an air passage was proposed in Japanese Patent Publication (A) No. 2005-199988.  
      In the prior art of this Japanese Patent Publication (A) No. 2005-199988, one end of the film-shaped member is fixed to the outside of the opening of the air passage, the other end of the film-shaped member is connected to a film-shaped member windup shaft, and this film-shaped member windup shaft rotates and moves in a direction away from and approaching one end of the film-shaped member (side where film-shaped member is fixed), whereby the film-shaped member is wound up or fed out.  
      Specifically, racks extending from one end to the other end of the film-shaped member are placed at the two ends of the film-shaped member windup shaft and pinions at the two ends of the film-shaped member windup shaft are meshed with the racks so as to enable the film-shaped member windup shaft to rotate and move.  
      When the film-shaped member is completely wound up, the opening is fully opened, while when the film-shaped member is completely fed out (unwound), the opening is fully closed.  
      In this prior art, the film-shaped member, film-shaped member windup shaft, racks, pinions, etc. are arranged at the air flow upstream side of the opening and the film-shaped member opens and closes the opening from the air flow upstream side.  
      Due to this, the film-shaped member is pushed by the pressure of the blown air against the seal surface at the periphery of the opening resulting in a sealing ability.  
      However, in this prior art, since the pinions and racks are arranged in the air passage at the air flow upstream side of the opening and the blown air directly strikes the pinions and rack, extraneous materials (sand, dust, etc.) which contaminate the blown air end up depositing on the pinions and racks and being caught between the pinions and racks.  
      If extraneous materials are caught between the pinions and racks, the problems arise that rotation of the pinions is obstructed, malfunctions occur, and noise is generated.  
     SUMMARY OF THE INVENTION  
      An object of the present invention, in consideration of this point, is to prevent extraneous materials from depositing on a windup shaft drive mechanism comprised of racks, pinions, etc. and thereby suppress malfunctions and occurrence of noise and improve the reliability of operation and quietness.  
      To achieve this object, the present invention provides an air passage opening/closing system provided with a case ( 1   a ) forming an air passage ( 3   a ,  13 ,  15 ,  16 ,  17 ) through which blown air flows, a film-shaped member ( 23 ) arranged in said case (la) and opening and closing an opening ( 11   a ,  12   a ,  27 ) of said air passage ( 3   a ,  13 ,  15 ,  16 ,  17 ), a fixing part ( 24 ) fixing one end of the film-shaped member ( 23 ) at a peripheral edge of the opening ( 11   a ,  12   a ,  27 ), a windup shaft ( 25 ) connected to the other end of the film-shaped member ( 23 ) and winding up and feeding out the film-shaped member ( 23 ), and a windup shaft drive mechanism ( 26 A and  26 B) rotating said windup shaft ( 25 ) and making it move over the opening ( 11   a ,  12   a ,  27 ) in a direction (D) away from and approaching the fixing part ( 24 ), the windup shaft ( 25 ) and windup shaft drive mechanism ( 26 A and  26 B) being arranged at an air flow upstream side of the opening ( 11   a ,  12   a ,  27 ), a blown air blocking part ( 35 ) covering at least an air flow upstream side part of the windup shaft drive mechanism ( 26 A and  26 B) being provided.  
      According to this, the blown air blocking part ( 35 ) covering at least an air flow upstream side part of the windup shaft drive mechanism ( 26 A and  26 B) can prevent the blown air from directly striking the windup shaft drive mechanism ( 26 A and  26 B).  
      For this reason, extraneous materials which contaminate the blown air (sand, dust, etc.) can be kept from depositing at the windup shaft drive mechanism ( 26 A and  26 B).  
      As a result, the trouble can be avoided of extraneous materials being caught inside the windup shaft drive mechanism ( 26 A and  26 B), obstructing driving of the windup shaft, causing malfunctions, and generating noise.  
      Further, in the present invention, the windup shaft drive mechanism ( 26 A and  26 B) is provided at the end of the windup shaft ( 25 ), a partition wall ( 37 ) extending from the peripheral edge of the opening ( 11   a ,  12   a ,  27 ) to the blown air blocking part ( 35 ) is formed between the windup shaft drive mechanism ( 26 A and  26 B) and film-shaped member ( 23 ), and a relief hole ( 39 ) in which the windup shaft ( 25 ) is inserted is formed at the partition wall ( 37 ) in an elongated shape extending across a range of movement of the windup shaft ( 25 ).  
      According to this, since the windup shaft drive mechanism ( 26 A and  26 B) and the film-shaped member ( 23 ) have a partition wall ( 37 ) formed between them, blown air trying to sneak around the sides of the blown air blocking part ( 35 ) and flow to the windup shaft drive mechanism ( 26 A and  26 B) can be blocked by the partition wall ( 37 ).  
      For this reason, not only can the blown air be prevented from directly striking the windup shaft drive mechanism ( 26 A and  26 B), but also the blown air can be prevented from sneaking around the sides of the blown air blocking part ( 35 ) and flowing to the windup shaft drive mechanism ( 26 A and  26 B).  
      As a result, extraneous materials (sand, dust, etc.) which contaminate the blown air can be kept from depositing at the windup shaft drive mechanism ( 26 A and  26 B).  
      Further, since the partition wall ( 37 ) is formed with relief holes ( 39 ) in which the windup shaft ( 25 ) is inserted as an elongated shape extending across the range of movement of the windup shaft ( 25 ), the windup shaft ( 25 ) can be prevented from interfering with the partition wall ( 37 ).  
      Further, the present invention forms the partition wall ( 37 ) integrally with the blown air blocking part ( 35 ) by plastic, so it is possible to facilitate the assembly of the partition wall ( 37 ) and blown air blocking part ( 35 ).  
      Further, the present invention forms the windup shaft drive mechanism ( 26 A and  26 B) by a pinion ( 30 ) provided at an end of the windup shaft ( 25 ) and a rack ( 29 ) meshing with the pinion ( 30 ). The relief hole ( 39 ) is formed so that the outer circumference of the windup shaft ( 25 ) at the far side from the rack ( 29 ) slides with the end face ( 39   b ) of the relief hole ( 39 ).  
      According to this, since the outer circumference of the windup shaft ( 25 ) at the side far from the rack ( 29 ) slides with the end face ( 39   b ) of the relief hole ( 39 ), the windup shaft ( 25 ) is acted on by a force in a direction pushed from the end face ( 39   b ) of the relief hole ( 39 ) to the rack ( 29 ) side.  
      For this reason, the pinion ( 30 ) provided at the end of the windup shaft ( 25 ) is pushed against the rack ( 29 ), so the pinion ( 30 ) can be prevented from detaching from the rack ( 29 ) and spinning idlely.  
      As a result, slipping of the rotation of the windup shaft ( 25 ) can be prevented and the windup shaft ( 25 ) can be rotated and moved in a direction away from and approaching the fixing part ( 24 ).  
      Further, the present invention forms slits ( 41 ) extending substantially in parallel with the end face ( 39   b ) at a part of the partition wall ( 37 ) near the end face ( 39   b ).  
      According to this, when extraneous materials deposit at the sliding parts of the outer circumference of the windup shaft ( 25 ) and the end face ( 39   b ) of the relief hole ( 39 ), the end face ( 39   b ) of the relief hole ( 39 ) can be made to elastically deform by the slits ( 41 ).  
      That is, by deformation by crushing of the slits ( 41 ), the end face ( 39   b ) can elastically deform so as to release the caught extraneous materials.  
      For this reason, the problem can be prevented of extraneous materials being caught at the sliding parts of the outer circumference of the windup shaft ( 25 ) and the end face ( 39   b ) of the relief hole ( 39 ) and obstructing movement of the windup shaft.  
      Further, in the present invention, the windup shaft drive mechanism ( 26 A and  26 B) is formed by a pinion ( 30 ) provided at an end of the windup shaft ( 25 ) and a rack ( 29 ) meshing with the pinion ( 30 ), and the relief hole ( 39 ) is formed so that a gap ( 40 ) of a predetermined dimension is set between the outer circumference of the windup shaft ( 25 ) at the side close to the rack ( 29 ) and the end face ( 39   a ) of the relief hole ( 39 ).  
      According to this, the outer circumference of the windup shaft ( 25 ) at the side close to the rack ( 29 ) does not directly slide with the end face ( 39   a ) of the relief hole ( 39 ), so no extraneous materials will be caught between the outer circumference and the end face ( 39   a ) of the relief hole ( 39 ).  
      For this reason, the problem can be avoided of extraneous materials being caught and obstructing movement of the windup shaft.  
      Further, the present invention forms the rack ( 29 ) by a plastic and forms the gear roots ( 29   a ) of the rack ( 29 ) in cross-sectional V-shapes, so forms extraneous materials catches ( 29   b ) between the gear roots ( 29   a ) and the gear tips ( 30   a ) of the pinion ( 30 ).  
      In the present invention, a partition wall ( 37 ) is provided so as to prevent blown air from sneaking around the sides of the blown air blocking part ( 35 ) and flowing to the windup shaft drive mechanisms ( 26 A and  26 B), but the partition wall ( 37 ) is formed with a relief hole ( 39 ) in which the windup shaft ( 25 ) is inserted, so part of the blown air passes through the relief hole ( 39 ) and ends up flowing to the windup shaft drive mechanism ( 26 A and  26 B).  
      For this reason, in the present invention as well, while slight in amount, extraneous materials which contaminate the blown air sometimes deposit at the windup shaft drive mechanism ( 26 A and  26 B).  
      Considering this point, in the present invention, the rack ( 29 ) is formed out of plastic to form the gear roots ( 29   a ) of the rack ( 29 ) in cross-sectional V-shapes.  
      That is, when forming the rack ( 29 ) by cutting metal, since a blade is used to cut away the metal, there are limits to how narrowly and deeply the gear roots ( 29   a ) of the rack ( 29 ) can be made, so forming the gear roots ( 29   a ) into cross-sectional V-shapes is difficult. On the other hand, as shown in the present invention, if forming the rack ( 29 ) from plastic, there is no limitation in shaping and the gear roots ( 29   a ) can be easily formed into cross-sectional V-shapes.  
      Further, since the gear roots ( 29   a ) of the rack ( 29 ) are formed in cross-sectional V-shapes, extraneous materials catches ( 29   b ) can be formed between the gear roots ( 29   a ) of the rack ( 29 ) and the gear tips ( 30   a ) of the pinion ( 30 ).  
      For this reason, even if extraneous materials deposit at the rack ( 29 ), the extraneous materials are collected at the extraneous materials catches ( 31   c ), so the problem can be avoided of the extraneous materials being caught between the rack ( 29 ) and pinion ( 30 ) and obstructing movement of the windup shaft.  
      Further, the present invention integrally forms the rack ( 29 ) with the partition wall ( 37 ) and blown air blocking part ( 35 ), so it is possible to easily assemble not only the partition wall ( 37 ) and blown air blocking part ( 35 ), but also the rack ( 29 ).  
      Further, the present invention allows movement of the windup shaft ( 25 ) at the partition wall ( 37 ) and provides a blocking member ( 43  to  46 ) blocking the relief hole ( 39 ).  
      According to this, part of the blown air passing through the relief hole ( 39 ) and flowing to the windup shaft drive mechanism ( 26 A and  26 B) can be prevented.  
      For this reason, extraneous materials which contaminate the blown air (sand, dust, etc.) can be further kept from depositing at the windup shaft drive mechanism ( 26 A and  26 B).  
      Further, in the present invention, specifically, the blocking member is formed by a film-shaped blocking member ( 43 ) arranged so as to overlap the relief hole ( 39 ) at the partition wall ( 37 ), a length of the film-shaped blocking member ( 43 ) in the movement direction (D) being longer than the length of the relief hole ( 39 ) in the movement direction (D) by exactly a predetermined dimension, one side of the film-shaped blocking member ( 43 ) in the movement direction (D) being folded up and the other side being extended along with movement of the windup shaft ( 25 ).  
      Due to this, it is possible to allow movement of the windup shaft ( 25 ) and block the relief hole ( 39 ).  
      Further, in the present invention, specifically the blocking member is formed by a multilayer slide door ( 44 ) arranged so as to overlap the relief hole ( 39 ) at the partition wall ( 37 ), the multilayer slide door ( 44 ) being comprised of a plurality of thin plate members ( 44   a  to  44   e ) stacked in the axial direction of the windup shaft ( 25 ), thin plate members at one side of the plurality of thin plate member ( 44   a  to  44   e ) in the movement direction (D) being stacked so as to be overlaid and thin plate members at the other side being stacked so as to be offset in a staircase manner along with movement of the windup shaft ( 25 ).  
      Further, in the present invention, specifically, the blocking member may be formed by an elastic member ( 45 ) arranged so as to overlap the relief hole ( 39 ) at the partition wall ( 37 ), the elastic member ( 45 ) may be formed with split surfaces ( 45   a ) extending substantially parallel to the movement direction (D) of the windup shaft ( 25 ), and the windup shaft ( 25 ) may push against the split surfaces ( 45   a ) and elastically deform the elastic member ( 45 ) to move between the split surfaces ( 45   a ).  
      Further, in the present invention, specifically, the blocking member may be formed by a large number of elastically deformable fiber- or strip-like brush members ( 46 ) projecting from the inner circumference of the relief hole ( 39 ) to the inside.  
      According to this, the windup shaft ( 25 ) can push against and elastically deform the brush members ( 46 ) while moving inside the relief hole ( 39 ) and the brush members ( 46 ) can block the relief hole ( 39 ). Incidentally, the reference numerals in parentheses after the above means are examples showing the correspondence with the specific means described in the later explained embodiment. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The present invention may be more fully understood from the description of the preferred embodiments of the invention set forth below together with the accompanying drawings, in which  
       FIG. 1  is a schematic cross-sectional view showing an air-conditioning unit in a first embodiment of the present invention;  
       FIG. 2  is a cross-sectional view of the part A-A in  FIG. 1 ;  
       FIG. 3  is a disassembled perspective view of a cassette type film door in  FIG. 1 ;  
       FIG. 4  is an enlarged cross-sectional view of the part B-B in  FIG. 2 ;  
       FIG. 5  is an enlarged view of a rack and pinion in a first embodiment and shows the state of the pinion meshed with the rack;  
       FIG. 6  is a perspective view of the vicinity of a relief hole of a first partition wall in the first embodiment;  
       FIG. 7A  is a schematic cross-sectional view of principal parts of a cold air passage opening/closing unit of a film door in a second embodiment of the present invention and shows the state with the cold air side opening fully closed, while  FIG. 7B  is a schematic cross-sectional view showing the state of the cold air side opening in  FIG. 7A  fully opened;  
       FIG. 8A  is a schematic cross-sectional view of principal parts of a cold air passage opening/closing unit of a film door in a third embodiment of the present invention and shows the state with the cold air side opening fully closed, while  FIG. 8B  is a schematic cross-sectional view showing the state of the cold air side opening in  FIG. 8A  fully opened;  
       FIG. 9A  is a schematic front view of a relief hole of a first partition wall of the cold air passage opening/closing unit in a fourth embodiment of the present invention and shows the state of the cold air side opening fully closed, while  FIG. 9B  is a schematic cross-sectional view showing the state of the cold air side opening in  FIG. 9A  fully opened; and  
       FIG. 10A  is a schematic front view of a relief hole of a first partition wall of the cold air passage opening/closing unit in a fifth embodiment of the present invention and shows the state of the cold air side opening fully closed, while  FIG. 10B  is a schematic cross-sectional view showing the state of the cold air side opening in  FIG. 10A  fully opened. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
     First Embodiment  
      Below, a first embodiment of the present invention will be explained based on  FIG. 1  to  FIG. 6 .  FIG. 1  shows the overall configuration in the case of applying the present invention to a vehicle air-conditioning system, while  FIG. 2  is a cross-sectional view of the part A-A in  FIG. 1 .  
      The air-conditioning unit  1  of the vehicle air-conditioning system in this embodiment has a plastic air-conditioner case  1   a . This air-conditioner case  1   a  is positioned at the inside from the instrument panel in the passenger compartment of the vehicle at the approximate center location in the vehicle width (left-right) direction and is positioned as shown by the arrows of  FIG. 1  and  FIG. 2  with respect to the front-back, top-bottom, and left-right directions of the vehicle.  
      The air-conditioner case  1   a , for convenience in removal from the mold in the case of molding and due to reasons such as assembly of the air-conditioner in the case, is specifically formed divided into a plurality of case members  1   b ,  1   c , and  1   d . These plurality of case members  1   b ,  1   c , and  1   d  are then fastened together.  
      More specifically, the air-conditioner case  1   a  is divided at a split surface (mold split surface)  1   e  into a front side case member  1   b  and rear side case members  1   c  and  1   d . Further, the rear side case members  1   c  and  1   d  are formed split at the substantial center of the vehicle left-right (width) direction into two left-right case members. That is, the joined surfaces of the rear side case members  1   c  and  1   d  is the vertical plane extending in the vehicle front-back direction.  
      Note that the vehicle left-right direction is the direction perpendicular to the paper surface of  FIG. 1 , while the vehicle front-back direction is the left-right direction of  FIG. 1 .  
      At the vehicle frontmost location in the air-conditioner case  1   a , an air inlet space  2  is formed through which blown air of a not shown blowing unit flows through a connection duct  1   f  (see  FIG. 2 ).  
      This connection duct  1   f  is arranged at the surface of the air-conditioner case  1   a  at the navigator&#39;s seat (surface of vehicle right side). An air outlet of a blowing unit (not shown) arranged inside from the instrument panel in the passenger compartment at the navigator&#39;s seat is connected to the connection duct  1   f . Therefore, by operating an electric blower in the blowing unit, air flows from the connection duct  1   f  to the inside of the air inlet space  2 .  
      Note that this embodiment is applied to a left hand steering wheel car, so the connection duct  1   f  is arranged at the surface of the air-conditioner case  1   a  at the vehicle right hand side, but when applied to a right hand steering wheel car, the connection duct  1   f  is arranged at the surface of the air-conditioner case  1   a  at the vehicle left hand side.  
      The air-conditioner case  1   a  is provided inside it with an evaporator  3  and heater core  4  in that order from the air upstream side. This evaporator  3  is a cooling use heat exchanger provided in a known refrigeration cycle and evaporating a refrigerant while absorbing heat from the air blown into the air-conditioner case  1   a  to thereby cool the blown air.  
      Note that in the refrigeration cycle, a compressor (not shown) sucking in and compressing a refrigerant is driven to rotate through a not shown pulley, belt, etc. by a not shown vehicle engine.  
      As this compressor, in this example, a fixed capacity compressor operating an electromagnetic clutch to change the operating rate of the compressor and adjust the discharge ability of the refrigerant is used, but a variable capacity compressor able to be adjusted in discharge ability of the refrigerant by a change of the discharge capacity may also be used.  
      Further, the heater core  4  is a heating use heat exchanger using the hot water of the vehicle engine (engine cooling water) as a heat source to heat the air in the air-conditioner case  1   a . The heater core  4  is arranged so that the top part is inclined to the vehicle front side by a predetermined angle.  
      The air downstream end of the air-conditioner case  1   a  is formed with a plurality of vent openings  5  to  10 . Among these, a defroster opening  5  is arranged at the top surface of the air-conditioner case  1   a . This defroster opening  5  has a not shown defroster duct connected to it. The defroster vent of the front end of this defroster duct blows air-conditioned air into the passenger compartment toward the surface of the windshield.  
      A front seat face opening  6  is arranged at the surface of the air-conditioner case  1   a  at the vehicle rear side. This front seat face opening  6  has a not shown front seat face duct connected to it. The face vent of the front end of this face duct blows air-conditioned air toward the upper bodies of the front seat (driver&#39;s seat and navigator&#39;s seat) passengers.  
      Front seat foot openings  7  are arranged at both the left and right sides above the surface of the air-conditioner case  1   a  at the vehicle rear side. These front seat foot openings  7  have not shown front seat foot ducts connected to them and blow air-conditioned air toward the feet of the front seat (driver&#39;s seat and navigator&#39;s seat) passengers.  
      A rear seat face opening  8  is arranged at below the surface of the air-conditioner case  1   a  at the vehicle rear side. This rear seat face opening  8  has a not shown rear seat face duct connected to it. Air-conditioned air is blown through this rear seat face duct from a vent provided at the bottom center of the passenger compartment toward the upper bodies of the rear seat passengers.  
      Rear seat foot openings  9  are positioned at both the left and right sides below the surface of the air-conditioner case  1   a  at the vehicle rear side. These rear seat foot openings  9  have not shown rear seat foot ducts connected to them. Air-conditioned air is blown through the rear seat foot ducts toward the feet of the rear seat passengers.  
      Further, B-pillar openings  10  are positioned at both the left and right sides below the surface of the air-conditioner case  1   a  at the vehicle rear side. The B-pillar openings  10  have not shown B-pillar ducts connected to them. Air-conditioned air is blown through these B-pillar ducts from a vent provided between the not shown B-pillars (among the pillars forming the space inside the passenger compartment, the second pillar from the front seen from the side surface) toward the upper bodies of the rear seat passengers.  
      Note that in this embodiment, the openings  5  to  10  are designed to be opened and closed by not shown vent mode doors.  
      Above a heater core  4 , a cold air side opening panel  11  is formed integrally with the rear side case members  1   c  and  1   d . This cold air side opening panel  11  is formed inside it with a cold air side opening  11   a . Further, at the front side of the heater core  4  (air flow upstream side), a hot air side opening panel  12  is formed integrally with the rear side case members  1   c  and  1   d . This hot air side opening panel  12  is formed inside it with a hot air side opening  12   a.    
      The hot air side opening panel  12  is formed parallel to the heater core  4  with its top end inclined to the vehicle front side. The cold air side opening panel  11  is formed with its top end inclined to the vehicle front side by a gentler angle than the hot air side opening panel  12 . For this reason, the bottom end of the cold air side opening panel  11  and the top end of the hot air side opening panel  12  are joined with a slight angle.  
      At the air flow downstream side of the evaporator  3 , a cold air passage  3   a  through which cold air cooled by passing through the evaporator  3  flows is formed across substantially the entire cross-section of the air-conditioner case  1   a . The cold air flowing through the upper side of the cold air passage  3   a , as shown by the arrow C 1 , passes through the cold air side opening  11   a  of the cold air side opening panel  11  and flows to a first bypass passage  13 . On the other hand, the cold air flowing through the bottom side of the cold air passage  3   a  passes through the hot air side opening  12   a  of the hot air side opening panel  12  as shown by the arrow C 2  and is heated by the heater core  4  to become hot air.  
      Further, a cassette type film door  14  opening and closing the two openings  11   a ,  12   a  is arranged abutting against the front surfaces of the cold air side opening panel  11  and hot air side opening panel  12  (surfaces of air flow upstream side). The film door  14  opens and closes the two openings  11   a ,  12   a  so as to adjust the flow rate of the cold air C 1  flowing through the first bypass passage  13  and the flow rate of the cold air C 2  heated by the heater core  4 .  
      At the air flow downstream side region of the heater core  4 , an upper side first hot air passage  15  and a lower side second hot air passage  16  are formed. The hot air heated by the heater core  4  is divided into hot air H 1  passing through the first hot air passage  15  and heading toward the defroster opening  5 , front seat face opening  6 , and front seat foot openings  7  and hot air H 2  passing through the second hot air passage  16  and heating toward the rear seat face opening  8 , rear seat foot openings  9 , and B-pillar openings  10 .  
      The film door  14  adjusts the flow rate of the cold air C 1  flowing through the first bypass passage  13  and the flow rate of the cold air C 2  heated by the heater core  4 , whereby the cold air C 1  and the hot air H 1  flowing through the first hot air passage  15  are mixed by a predetermined ratio and form the desired temperature air-conditioned air.  
      Note that  FIG. 1  shows the state with the film door  14  fully closing the cold air side opening  11   a  of the cold air side opening panel  11  and blocking the cold air C 1  and fully opening the hot air side opening  12   a  of the hot air side opening panel  12  and maximizing the flow rate of the cold air C 2 .  
      Further, below the heater core  4 , as shown by the arrow C 3 , a second bypass passage  17  is formed. Cold air flowing through the bottommost past of the cold air passage  3   a  flows to the second bypass passage  17 .  
      This second bypass passage  17  has a rear seat air mix door  18  arranged at it. The second bypass passage  17  is designed to be opened and closed by the rear seat air mix door  18 . This rear seat air mix door  18  is a plate-shaped door able to pivot about a rotary shaft  18   a.    
      This rear seat air mix door  18  enables the hot air H 2  and the cold air C 3  to be mixed by a predetermined ratio and form the desired temperature air-conditioned air. Note that in  FIG. 1 , the solid line position of the rear seat air mix door  18  shows the state with the second bypass passage  17  fully opened and the hot air H 2  blocked. The two-dot chain position of the rear seat air mix door  18  shows the state with the second bypass passage  17  fully closed and the cold air C 3  blocked.  
      As shown in  FIG. 2 , in this embodiment, the air passage in the air-conditioner case  1   a  is partitioned by a partition plate  19  positioned at the center of the vehicle width direction. The air passage at the driver&#39;s seat side (vehicle left side) in the air-conditioner case  1   a  and the air passage at the navigator&#39;s seat side (vehicle right side) are provided with independent cassette type film doors  14 .  
      The film doors  14  independently provided at the driver&#39;s seat side and navigator&#39;s seat side may be independently operated so as to enable the temperature of the air-conditioned air blown into the driver&#39;s seat side passenger compartment and the temperature of the air-conditioned air blow into the navigator&#39;s seat side passenger compartment to be independently adjusted.  
      The film door  14  of the driver&#39;s seat side (vehicle left side) is arranged abutting against the front surface (surface at air flow upstream side) of the cold air side opening panel  11  and hot air side opening panel  12  formed at the rear side case member  1   d.    
      Similarly, the film door  14  of the navigator&#39;s seat side (vehicle right side) is arranged abutting against the front surface of the cold air side opening panel  11  and hot air side opening panel  12  formed at the rear side case member  1   d.    
       FIG. 3  is a perspective view showing the film door  14  of the driver&#39;s seat side alone. Note that the film door  14  at the navigator&#39;s seat side is configured symmetric with the film door  14  of the driver&#39;s seat side (vehicle left side) in the left-right direction, so illustration will be omitted. Below, the film door  14  of the driver&#39;s seat side will be explained.  
      The film door  14  is comprised of a cold air passage opening/closing unit  14   a  opening and closing the cold air side opening  11   a  of the cold air side opening panel  11  and a hot air passage opening/closing unit  14   b  opening and closing the hot air side opening  12   a  of the hot air side opening panel  12  formed integrally aligned in the vertical direction.  
      This integrally formed film door  14  is formed with three mounting holes  21  corresponding to three mounting bosses  20  provided at the rear side case member  1   d . Not shown screws are inserted into the three mounting holes  21  and screwed into female screw holes of the mounting bosses  20  so as to fasten the film door  14  to the rear side case member  1   d.    
      The cold air passage opening/closing unit  14   a  and the hot air passage opening/closing unit  14   b  of the film door  14  are configured substantially the same, so below the cold air passage opening/closing unit  14   a  will be explained. Parts the same or equivalent to the cold air passage opening/closing unit  14   a  in the hot air passage opening/closing unit  14   b  are assigned the same reference numerals and explanations are omitted.  
      The cold air passage opening/closing unit  14   a  is comprised of a substantially rectangular base member  22  integrally formed by a plastic above which a film-shaped member  23 , fixed shaft  24 , windup shaft  25 , and windup shaft drive mechanisms  26 A and  26 B etc. are arranged.  
      The surface of the substantially rectangular base member  22  against which the cold air side opening panel  11  and hot air side opening panel  12  abut is formed bent at a slight angle matching with the inclinations of the cold air side opening panel  11  and hot air side opening panel  12 .  
      This slightly bent surface is formed with an opening  27  overlapping the cold air side opening  11   a  of the cold air side opening panel  11 . Due to this, the cold air cooled by passing through the evaporator  3  passes through the opening  27  and cold air side opening  11   a  and flows to the first bypass passage  13 .  
      The film-shaped member  23  opens and closes the cold air side opening  11   a  by opening and closing this opening  27 . As a specific material, various plastic materials having flexibility able to be wound up by the windup shaft  25  can be used.  
      For example, PET (polyethylene terephthalate) film, PPS (polyphenylene sulfide) film, etc. are suitable. These film materials may also be laminated on woven fabric. Further, the thickness of the film-shaped member  23  may be for example 200 μm or so.  
      The fixed shaft  24  is arranged at the bottom side of the opening  27  and fixes the bottom end side of the film-shaped member  23 . That is, in the base member  22 , the peripheral edges at the opening  27  are formed with a flat seal face  28 . One end of the film-shaped member  23  is fixed to the seal face  28  by the fixed shaft  24 . Note that the fixed shaft  24  corresponds to the fixing part in the present invention.  
       FIG. 4  shows an enlarged cross-sectional view of the part B-B in  FIG. 2 . As shown in  FIG. 4 , the windup shaft  25  is comprised of a windup part  25   a  for winding up the film-shaped member  23  and small diameter parts  25   b  at the two ends of the windup part  25   a . The top end of the film-shaped member  23  is connected to the windup part  25   a.    
      A windup shaft drive mechanism  26 A provided at one end of the base member  22  in the left-right direction (right side of  FIG. 4 ) is comprised of a rack  29 , pinion  30 , projection  25   c  of the windup shaft  25 , and cylindrical drive shaft  31 . The windup shaft drive mechanism  26 B provided at the other side of the base member  22  in the left-right direction (left side of  FIG. 4 ) is comprised of a rack  29  and pinion  30 .  
      The racks  29  are formed integrally with the base member  22  of the film door  14  by a plastic and are arranged at the long parts of the left and right of the base member  22 . Therefore, the racks  29  are arranged in directions perpendicular to the axial direction of the windup shaft  25 .  
      The two ends of the windup shaft  25  are provided with pinions  30 . The pinions  30  are designed to mesh with the rack  29 .  
       FIG. 5  is an enlarged view of a rack  29  and pinion  30  and shows the state of the pinion  30  meshed with the rack  29 . In this embodiment, the rack  29  is formed by a plastic, so the gear roots  29   a  of the rack  29  can be formed deeply in cross-sectional V-shapes.  
      That is, when forming the rack  29  by cutting metal, since a blade is used to cut away the metal, there are limits to how narrowly and deeply the gear roots  29   a  of the rack  29  can be made, so forming the gear roots  29   a  into cross-sectional V-shapes is difficult. On the other hand, as in this embodiment, if forming the rack  29  from plastic, there is no limitation in shaping and the gear roots  29   a  can be easily formed into cross-sectional V-shapes.  
      Further, since the gear roots  29   a  of the rack  29  are formed in cross-sectional V-shapes, extraneous materials catches  29   b  can be formed between the gear roots  29   a  of the rack  29  and the gear tips  30   a  of the pinion  30 .  
      Note that the pinion  30  and the windup shaft  25  have a not shown coil spring attached between them. The windup shaft  25  is tensed by this coil spring in a direction winding up the film-shaped member  23 .  
      By extending the small diameter part  25   b  at the outer side of the rear case member  1   d  (right side in  FIG. 4 ) among the small diameter parts  25   b  at the two ends of the windup shaft  25  toward the outer side of the rear side case member  1   d , a projection  25   c  projecting out from the pinion  30  is formed.  
      At the projecting direction side of this projection  25   c , a cylindrical drive shaft  31  is arranged facing the same direction as the rack  29 . Therefore, the drive shaft  31  is arranged in a direction perpendicular to the axial direction of the windup shaft  25 .  
      This cylindrical drive shaft  31  is formed at its outer circumference with a spiral groove  31   a . This spiral groove  31   a  has the projection  25   c  of the windup shaft  25  mated with it.  
      The drive shaft  31  is rotatably supported through the bracket  32  with respect to the base member  22 . The bracket  32  is formed into an approximately U-shape having facing surfaces  32   a ,  32   b  facing each other at its two ends.  
      One of the facing surfaces  32   a  of the bracket  32  is formed with a through hole (not shown). This through hole has one end of the drive shaft  31  (top end of film door  14 ) inserted into it in a rotatable manner. The other facing surface  32   b  is formed with a cylindrical mating part  32   c . The front end of the other end of the drive shaft  31  (center of film door  14  in vertical direction) is rotatably mated with the cylindrical mated part  32   c.    
      Further, the front ends  32   d    32   e  of the two facing surfaces  32   a  and  32   b  of the substantially U-shaped bracket  32  mate with the mating grooves  22   a  of the base member  22  side to fasten the bracket  32  to the base member  22 , whereby the drive shaft  31  is rotatably supported with respect to the base member  22 .  
      At this time, as shown in  FIG. 4 , the drive shaft  31  and bracket  32  are arranged so as to project from the side wall of the rear side case member  1   d  to the outside (right side of  FIG. 4 ).  
      The drive shaft  31  and bracket  32  projecting from the side wall of the rear side case member  1   d  to the outside are covered by a cover member  42 . This cover member  42  has a box shape overall in the present embodiment and is formed from a plastic.  
      The cover member  42  is arranged to cover the drive shaft  31  and bracket  32  from the outer side of the case (right side in  FIG. 4 ) and fastened to the case members  1   b  and  1   d  by screw means after fastening the film door  14  to the rear side case member  1   d  and fastening the case members  1   b ,  1   c , and  1   d  together.  
      Specifically, not shown screws are inserted into the four mounting holes  42   a  formed at the cover member  42  and screwed into not shown female screw holes at the case member  1   b  and  1   d  side so that the cover member  42  is fastened to the case members  1   b  and  1   d.    
      Due to this, the drive shaft  31  and bracket  32  are accommodated in the box-shaped cover member  42 . Further, the cover member  42  is formed at its long direction (vertical direction of  FIG. 3 ) end with a cutaway part  42   b . One end of the drive shaft  31  is designed to project out from the cutaway part  42   b  to the outside of the cover member  42 .  
      Further, the end of the drive shaft  31  projecting out to the outside of the cover member  42  is connected to the rotary shaft of the servo motor  33  at the outside of the case members  1   b  and  1   d  and driven to rotate.  
      When the rotational drive of the servo motor  33  causes the drive shaft  31  to rotate, the mating position of the spiral groove  31   a  and the projection  25   c  of the windup shaft  25  changes in the axial direction of the drive shaft  31 , whereby a pushing force acts directly from the wall surface of the spiral groove  31   a  to the projection  25   c  of the windup shaft  25 .  
      This pushing force causes the pinions  30  at the two ends of the windup shaft  25  to rotate on the racks  29  and move in the arrow D direction of  FIG. 3  (direction perpendicular to the paper surface in  FIG. 4 ), so the windup shaft  25  rotates and moves in a direction away from or approaching the fixed shaft  24  along a plane parallel to the seal face  28 .  
      Along with this rotation and movement of the windup shaft  25 , the film-shaped member  23  can be wound up or fed out from above and the opening area of the cold air side opening  11   a  of the air-conditioner case  1   a  side can be adjusted. As a result, the amount of cold air passing through the first bypass passage  13  can be adjusted.  
      Further, when the film-shaped member  23  fully closes the cold air side opening  11   a  of the air-conditioner case  1   a  side, the film-shaped member  23  is pushed by the pressure of the cold air against the seal face  28 . Due to this, when the cold air side opening  11   a  is fully closed, sealability is exhibited between the film-shaped member  23  and the seal face  28  and cold air can be blocked out well.  
      The opening  27  of the base member  22  has a plurality of struts  27   a  arranged in it in a direction parallel or perpendicular to the movement direction D of the windup shaft  25 . These struts  27   a  prevent the pressure of the cold air from causing the film-shaped member  23  to bend (swell) by a large amount to the air flow downstream side. Note that in this embodiment, this plurality of struts  27   a  are formed integrally with the base member  22 .  
      As shown in  FIG. 4 , the bottom part  31   b  of the spiral groove  31   a  of the drive shaft  31  is formed so as to become deeper than the front end  25   d  of the projection  25   c  of the windup shaft  25 . For this reason, a extraneous materials catch  31   c  is formed between the front end  25   d  of the projection  25   c  of the windup shaft  25  and the bottom part  31   b  of the spiral groove  31   a  of the drive shaft  31 .  
      The film door  14  is provided with blocking walls  35  covering the parts of the windup shaft drive mechanisms  26 A and  26 B at the air flow upstream side and thereby preventing blown air from directly striking the windup shaft drive mechanisms  26 A and  26 B.  
      The blocking walls  35  correspond to the blown air blocking part in the present invention. Below, the blocking walls  35  will be explained.  
      The blocking walls  35  are arranged at the two ends of the base member  22  in the left-right direction. They have substantially rectangular flat shapes facing the racks  29  so as to cover the left and right racks  29  and pinions  30  of the base member  22  from the air flow upstream side and are formed integrally with first and second partition walls  37  and  38  and the base member  22  of the film door  14 .  
      The first partition walls  37  are formed along the entire length of the base member  22  in the vertical direction extending from the seal faces  28  at the two sides of the opening  27  at the left and right to the left and right blocking walls  35 . The first partition walls  37  are formed with long relief holes  29  with long directions facing the arrow D direction. Note that the first partition walls  37  correspond to the partition wall in the present invention.  
       FIG. 6  is a perspective view of the vicinity of a relief hole  39  of a first partition wall  37  and shows the state when viewed from the drive shaft  31  side to the first partition wall  37  side. As shown in  FIG. 6 , a small diameter part  25   b  at the end of the windup shaft  25  is inserted into the relief hole  39 . When the windup shaft  25  rotates and moves, the small diameter part  25   b  moves in the relief hole  39  in the arrow D direction.  
      The second partition walls  38  are formed at the vertical direction ends of the base member  22  so as to extend from the left and right first partition walls  37  toward the rack  29  side.  
      As shown in  FIG. 4 , at the right side of the base member  22 , the end face  35   a  of the blocking wall  35  and the end face  38   a  of the second partition wall  38  abut against the side wall of the front side case member  1   b . Further, at the left side of the base member  22 , the end face  35   a  of the blocking wall  35  and the end face  38   a  of the second partition wall  38  abut against the flat surface of the partition plate  19 .  
      Therefore, the windup shaft drive mechanism  26 A at the right side of the base member  22  is held in a space separated by the blocking wall  35  and first and second partition walls  37  and  38 , etc. from the cold air passage  3   a , while the windup shaft drive mechanism  26 B at the left side of the base member  22  is held in the space separated by the blocking wall  35  and first and second partition walls  37  and  38 , etc. from the cold air passage  3   a.    
      As shown in  FIG. 6 , a gap  40  of a predetermined dimension is provided between the end face  39   a  of the relief hole  39  of the first partition wall  37  at the rack  29  side (bottom side of  FIG. 6 ) and the outer circumference of the small diameter part  25   b  of the windup shaft  25 .  
      On the other hand, the end face  39   b  of the relief hole  39  facing this end face  39   a  slides with the outer circumference of the small diameter part  25   b  of the windup shaft  25 . Due to this, the windup shaft  25  is pushed from the end face  39   b  to the rack  29  side. For this reason, the pinion  30  is pushed against the rack  29 , so the pinion  30  can be prevented from detaching from the rack  29  and spinning idlely.  
      Further, the part of the first partition wall  37  near the end face  39   b  of the relief hole  39  is formed with a large number of slits  41  substantially parallel to the end face  39   b . As shown in  FIG. 3 , among this large number of slits  41 , the slits at the two ends of the relief hole  39  in the long direction are formed with arcuate parts  41   a  running along the arcuate shape of the relief hole  39 .  
      Next, the actions and effects of the embodiments will be explained. Note that below, the actions and effects of the cold air passage opening/closing unit  14   a  of the film door  14  will be explained. The hot air passage opening/closing unit  14   b  gives the same actions and effects as the cold air passage opening/closing unit  14   a , so the explanation of the actions and effects will be omitted.  
      If the electric blower in the blowing unit is operated, the cold air cooled by passing through the evaporator  3  flows inside the cold air passage  3   a  toward the film door  14 .  
      Further, the film-shaped member  23  of the film door  14  adjusts the opening area of the cold air side opening  11   a  at the air-conditioner case  1   a  side so as to adjust the flow rate of the cold air flowing through the first bypass passage  13 .  
      At this time, as shown in  FIG. 4 , the cold air flowing toward the windup shaft drive mechanisms  26 A and  26 B is blocked by the blocking wall  35 , so cold air can be prevented from directly striking the windup shaft drive mechanisms  26 A and  26 B.  
      As a result, extraneous materials (sand, dust, etc.) which contaminate the cold air can be prevented from depositing at the windup shaft drive mechanisms  26 A and  26 B and causing malfunctions or noise.  
      Specifically, extraneous materials can be prevented from being caught between the racks  29  and pinions  30  and being caught between the spiral groove  31   a  of the drive shaft  31  and the projection  25   c  of the windup shaft  25  and thereby causing malfunctions or the generation of noise.  
      Further, in this embodiment, the windup shaft drive mechanisms  26 A and  26 B are accommodated in the spaces at the left and right sides of the base member  22  separated by the blocking walls  35  and first and second partition walls  37  and  38 , etc. from the cold air passage  3   a.    
      For this reason, the cold air blocked by the blocking walls  35  can be prevented from invading the windup shaft drive mechanism  26 A and  26 B sides by sneaking around from directions other than the air flow upstream side. As a result, extraneous materials (sand, dust, etc.) which contaminate the blown air can be better prevented from depositing at the windup shaft drive mechanisms  26 A and  26 B and causing malfunctions or noise.  
      In this embodiment, the first partition walls  37  are formed with relief holes  39  for enabling the small diameter parts  25   b  at the two ends of the windup shaft  25  to move in the arrow D direction (front-back sides of paper surface in  FIG. 4 ). Part of the cold air ends up passing through the relief holes  39  and flowing to the windup shaft drive mechanisms  26 A and  26 B.  
      For this reason, while small in amount, the extraneous materials which contaminate the cold air (sand, dust, etc.) sometimes deposit at the windup shaft drive mechanisms  26 A and  26 B.  
      Therefore, in this embodiment, extraneous materials catches  29   b  were formed between the gear tips  30   a  of the racks  29  and the gear roots  29   a  of the pinions  30 , while a extraneous materials catch  31   c  was formed between the front end  25   d  of the projection  25   c  of the windup shaft  25  and bottom  31   b  of the spiral groove  31   a  of the drive shaft  31 .  
      For this reason, even if extraneous materials deposit at the racks  29  or spiral groove  31   a  of the drive shaft  31 , the extraneous materials are collected in the extraneous materials catches  29   b  and  31   b.    
      As a result, extraneous materials can be prevented from being caught between the gear roots  29   a  of the racks  29  and the gear tips  30   a  of the pinions  30  or between the front end  25   d  of the projection  25   c  of the windup shaft  25  and the bottom  31   b  of the spiral groove  31   a  of the drive shaft  31 .  
      Further, gaps  40  of predetermined dimensions are provided between the outer circumferences of the small diameter parts  25   b  of the windup shaft  25  and the end faces  39   a  of the relief holes  39  on the rack  29  side (bottom side of  FIG. 6 ), so extraneous materials can be prevented from being caught between the outer circumference of the small diameter parts  25   b  of the windup shaft  25  and the end faces  39   a  of the relief holes  39  at the rack  29  side.  
      On the other hand, no gaps of predetermined dimensions are provided between the end faces  39   b  of the relief holes  39  facing the end faces  39   a  and the outer circumferences of the small diameter parts  25   b  of the windup shaft  25 . The outer circumferences of the small diameter parts  25   b  are designed to slide with the end faces  39   b.    
      Therefore, in this embodiment, the parts of the first partition walls  37  near the end faces  39   b  of the relief holes  39  are formed with large numbers of slits  41  substantially parallel to the end faces  39   b . Due to this, when extraneous materials deposit between the outer circumferences of the small diameter parts  25   b  of the windup shaft  25  and the end faces  39   b  of the relief holes  39 , the end faces  39   b  of the relief holes  39  can elastically deform to the slit  41  sides.  
      That is, by deforming the slits  41  to be crushed in the width direction (vertical direction of  FIG. 6 ), the end faces  39   b  of the relief holes  39  can elastically deform so enable the release of caught extraneous materials.  
      For this reason, it is possible to avoid extraneous materials from being caught between the outer circumference of the small diameter parts  25   b  of the windup shaft  25  and the end faces  39   b  of the relief holes  39  and thereby obstructing rotation and movement of the windup shaft  25 .  
      Further, among this large number of slits  41 , the slits at the two ends of the relief holes  39  in the long direction are formed with arcuate parts  41   a  running along the arcuate shapes of the relief holes  39 . For this reason, the two ends of the relief holes  39  in the long direction can also easily elastically deform so that the end faces of the relief holes  39  release the caught extraneous materials.  
     Second Embodiment  
      In the first embodiment, part of the cold air passes through the relief holes  39  of the first partition walls  37  and flows to the windup shaft drive mechanisms  26 A and  26 B, but in the second embodiment, as shown in  FIGS. 7A and 7B , film-shaped blocking members  43  are arranged at the relief holes  39  to block cold air from passing through the relief holes  39 , so extraneous materials can be better prevented from depositing at the windup shaft drive mechanisms  26 A and  26 B.  
       FIG. 7A  is a schematic cross-sectional view of principal parts of the cold air passage opening/closing unit  14   a  of the film door  14  in the present embodiment, while  FIG. 7B  shows the state with the cold air side opening  11   a  fully opened in  FIG. 7A .  
      Note that the hot air passage opening/closing unit  14   b  is substantially the same in configuration as the cold air passage opening/closing unit  14   a , so the illustration and explanation are omitted.  
      As the film-shaped blocking members  43  in the present embodiment, in this embodiment, plastic film materials are used. The film-shaped blocking members  43  are arranged at the surfaces of the left and right first partition walls  37  at the cold air passage  3   a  side.  
      The film-shaped blocking members  43  are positioned across the entire lengths of the first partition walls  37  in the height directions of the first partition walls  37  (directions perpendicular to paper surface of  FIG. 7 ). The two ends  43   a  of the windup shaft  25  in the movement direction D are fastened to the first partition walls  37  by adhesion etc.  
      The film-shaped blocking members  43  are formed, at the approximate centers of their movement directions D, with insertion holes  43   b  in which the small diameter parts  25   b  of the windup shaft  25  are slidably inserted. The lengths of the film-shaped blocking members  43  in the movement directions D are longer than the lengths of the relief holes  39  in the long directions by exactly predetermined dimensions.  
      As shown in  FIG. 7A , in the state with the cold air passage opening/closing unit  14   a  fully closing the cold air side opening  11   a , the parts of the film-shaped blocking members  43  above the insertion holes  43   b  (sides in direction away from fixed shaft  24 ) are folded up. On the other hand, the parts of the film-shaped blocking members  43  below the insertion holes  43   b  (sides in direction approaching fixed shaft  24 ) are extended.  
      For this reason, since the relief holes  39  of the first partition walls  37  are blocked by the film-shaped blocking members  43 , the cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      As shown in  FIG. 7B , when the windup shaft  25  rotates and moves in a direction approaching the fixed shaft  24  (bottom direction of  FIG. 7 ) and fully opens the cold air side opening  11   a , the inner circumferences of the insertion holes  43   b  of the film-shaped blocking members  43  are pushed downward (side in direction approaching fixed shaft  24 ) by the outer circumferences of the small diameter parts  25   b  of the windup shaft  25 .  
      For this reason, the parts of the film-shaped blocking members  43  below the insertion holes  43   b  are folded up, while the parts of the film-shaped blocking members  43  above the insertion holes  43   b  (sides in direction moving away from fixed shaft  24 ) are extended.  
      That is, by making the lengths of the film-shaped blocking members  43  in the movement direction D longer than the lengths of the relief holes  39  in the long direction by exactly predetermined dimensions, even if first sides of the film-shaped blocking members  43  are folded up along with movement of the windup shaft  25 , the film-shaped blocking members  43  will no longer become insufficient in length and the entire relief holes  39  can be blocked.  
      For this reason, the relief holes  39  of the first partition walls  37  are blocked by the film-shaped blocking members  43 , so cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      In this way, in this embodiment, regardless of the opened/closed state of the cold air side opening  11   a , the relief holes  39  of the first partition walls  37  are blocked by the film-shaped blocking members  43 , therefore cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      As a result, extraneous materials which contaminate the cold air can be prevented more from depositing at the windup shaft drive mechanisms  26 A and  26 B.  
     Third Embodiment  
      In the above second embodiment, film-shaped blocking members  43  are positioned at the relief holes  39  to block cold air from passing through the relief holes  39 , but in the third embodiment, as shown in  FIGS. 8A and 8B , multilayer slide doors  44  are positioned at the relief holes  39  to block the cold air from passing through the relief holes  39 .  
       FIG. 8A  is a schematic cross-sectional view of principal parts of the cold air passage opening/closing unit  14   a  of the film door  14  in the present embodiment and shows the state with the cold air side opening  11   a  fully closed, while  FIG. 8B  shows the state with the cold air side opening  11   a  fully opened in  FIG. 8A .  
      Note that hot air passage opening/closing unit  14   b  is substantially the same in configuration as the cold air passage opening/closing unit  14   a , so the illustration and explanation are omitted.  
      The multilayer slide doors  44  in the present embodiment use the basic structure of the multilayer slide doors in Japanese Patent Application No. 2004-265325 previously filed by the same assignee.  
      The multilayer slide doors  44  in the present embodiment are positioned at the left and right first partition walls  37  at the sides opposite to the cold air passage  3   a . In this embodiment, the multilayer slide doors  44  are comprised of first to fifth thin plate members  44   a  to  44   e  formed from a plastic stacked in directions perpendicular to the first partition walls  37 .  
      Specifically, first and second thin plate members  44   a  and  44   b  are stacked at first ends of the relief holes  39  in the long direction, third and fourth thin plate members  44   d  and  44   d  are stacked at seconds ends in the long direction, and fifth thin plate members  44   e  are stacked so as to straddle the second thin plate member  44   b  and fourth thin plate member  44   d.    
      Projections  44   f  are formed at the two ends of the first to fifth thin plate members  44   a  to  44   e  in the front-back directions. The first to fifth thin plate members  44   a  to  44   e  engage with each other by the projections  44   f . First projections  44   f  of the first and third thin plate members  44   a  and  44   c  adjoining the first partition walls  37  among the stacked first to fifth thin plate members  44   a  to  44   e  engage with projections  37   a  formed integrally with the first partition walls  37 .  
      Note that in  FIGS. 8A and 8B , for convenience in illustration, only some of the projections  44   f  formed at the two ends of the first to fifth thin plate members  44   a  to  44   e  in the front-back direction are assigned reference numerals. The reference numerals of the other projections  44   f  are omitted.  
      The fifth thin plate members  44   e  stacked straddling the second thin plate members  44   b  and fourth thin plate members  44   d  are formed at their centers with insertion holes  44   g  in which the small diameter parts  25   b  of the windup shaft  25  are slidably inserted.  
      Note that first to fifth thin plate members  44   a  to  44   e  are formed extending over the entire lengths of the first partition walls in the height directions of the first partition walls  37  (directions perpendicular to paper surface in  FIG. 8 ). Therefore, the first to fifth thin plate members  44   a  to  44   e  slide against the blocking walls  35  and the flat parts of the base member  22  facing the blocking walls  35  at the two end faces of the first partition walls  37  in the height direction.  
      As shown in  FIG. 8A , in the state with the cold air passage opening/closing unit  14   a  fully closing the cold air side opening  11   a , first ends of the first and second thin plate members  44   a  and  44   b  abut against the small diameter parts  25   b  of the windup shaft  25 , and first and second thin plate members  44   a  and  44   b  are stacked so as to overlap at first ends of the relief holes  39  in the long direction. Further, the third to fifth thin plate members  44   c  to  44   e  overlap with each other only at the ends and are stacked in states offset in staircase like manners.  
      At this time, the other projections  44   f  of the third thin plate members  44   c  are engaged with the projections  37   a  formed integrally with the first partition walls  37 , so the multilayer slide doors  44  formed by the first to fifth thin plate members  44   a  to  44   e  overlap the relief holes  39 .  
      For this reason, the relief holes  39  of the first partition walls  37  are blocked by the multilayer slide doors  44 , so cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      As shown in  FIG. 8B , when the windup shaft  25  rotates and moves in a direction approaching the fixed shaft  24  (bottom direction of  FIG. 8 ) and the cold air side opening  11   a  is fully opened, the inner circumferences of the insertion holes  44   g  of the fifth thin plate members  44   e  are pushed by the outer circumferences of the small diameter parts  25   b  of the windup shaft  25  and the fifth thin plate members  44   e  move to the bottom side (side in direction approaching the fixed shaft  24 ).  
      Along with movement of the fifth thin plate-members  44   e , the fifth thin plate members  44   e  and the second thin plate members  44   b  engage by the projections  44   f  and the second thin plate members  44   b  move in the same direction. If the second thin plate members  44   b  move, the second thin plate members  44   b  and the first thin plate members  44   a  engage by the projections  44   f  and the first thin plate members  44   a  move in the same direction. For this reason, the first and second thin plate members  44   a  and  44   b  are stacked in a state offset like a staircase.  
      On the other hand, first end faces of the third and fourth thin plate members  44   c  and  44   d  are moved while pushed against the outer circumferences of the small diameter parts  25   b  of the windup shaft  25 . The third and fourth thin plate members  44   c  and  44   d  are stacked so that they overlap at the other ends of the relief holes  39  in the long direction.  
      At this time, first projections  44  of the first thin plate members  44   a  are engaged with the projections  37   a  formed integrally with the first partition walls  37 , so the multilayer slide doors  44  formed by the first to fifth thin plate members  44   a  to  44   e  overlap the relief holes  39 .  
      For this reason, the relief holes  39  of the first partition walls  37  are blocked by the multilayer slide doors  44 , so the cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      In this way, in this embodiment, regardless of the opened/closed state of the cold air side opening  11   a , the relief holes  39  of the first partition walls  37  are blocked by the multilayer slide doors  44  whereby the cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      As a result, the same effects as in said second embodiment can be obtained.  
     Fourth Embodiment  
      In the second embodiment, film-shaped blocking members  43  are positioned at the relief holes  39  and block the cold air passing through the relief holes  39 . In the fourth embodiment, as shown in  FIGS. 9A and 9B , elastic members  45  are arranged at the relief holes  39  and block the cold air from passing through the relief holes  39 .  
       FIG. 9A  is a schematic front view of one of the relief holes  39  of the first partition walls  37  of the cold air passage opening/closing unit  14   a  in the present embodiment and shows the state where the cold air side opening  11   a  is fully closed, while  FIG. 9B  shows the state where the cold air side opening  11   a  is fully opened in  FIG. 9A .  
      Note that the relief holes  39  of the hot air passage opening/closing unit  14   b  side are configured the same as the cold air passage opening/closing unit  14   a  side, so the illustration and explanation are omitted.  
      The elastic members  45  in this embodiment are formed by an elastomer, rubber, or other elastic material and are arranged so as to block the relief holes  39 . In this embodiment, the elastic members  45  are split into two by split surfaces  45   a  extending in the long direction of the relief holes  39  and are fastened by adhesion etc. to the inner circumferences of the relief holes  39 .  
      As shown in  FIG. 9A , in the state with the cold air side opening  11   a  fully closed, the split surfaces  45   a  of the elastic members  45  are pushed by the outer circumferences of the small diameter parts  25   b  of the windup shaft  25  to be elastistically deformed, whereby the small diameter parts  25   b  are inserted between the split surfaces  45   a  of the elastic members  45 .  
      For this reason, the relief holes  39  of the first partition walls  37  are blocked by the elastic members  45 , so cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      As shown in  FIG. 9B , when the windup shaft  25  rotates and moves in a direction approaching the fixed shaft  24  (right direction of  FIG. 9 ) and the cold air side opening  11   a  is fully opened, the windup shaft  25  pushes against the split surfaces  45   a  of the elastic members  45  by the outer circumferences of the small diameter parts  25   b  to elastically deform the elastic members  45  and move between the split surfaces  45   a  to the right side of  FIG. 9 .  
      For this reason, the relief holes  39  of the first partition walls  37  are blocked by the elastic members  45 , so cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      In this way, in this embodiment, regardless of the opened/closed state of the cold air side opening  11   a , the relief holes  39  of the first partition walls  37  are blocked by the elastic members  45 , so cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      As a result, the same effects as in the second embodiment can be obtained.  
     Fifth Embodiment  
      In the fourth embodiment, elastic members  45  are arranged at the relief holes  39  and block the cold air from passing through the relief holes  39 , but in the fifth embodiment, as shown in  FIGS. 10A and 10B , brush-shaped members  46  are arranged at the relief holes  39  and block the cold air from passing through the relief holes  39 .  
       FIG. 10A  is a schematic front view of one of the relief holes  39  of the first partition walls  37  of the cold air passage opening/closing unit  14   a  in the present embodiment and shows the state with the cold air side opening  11   a  fully closed, while  FIG. 10B  shows the state of the cold air side opening  11   a  fully opened in  FIG. 10A .  
      Note that the relief holes  39  of the hot air passage opening/closing unit  14   b  side are configured the same as the cold air passage opening/closing unit  14   a  side, so the illustration and explanation are omitted.  
      The brush-shaped members  46  in this embodiment are comprised of elastically deformable plastic fiber-shaped members. Specifically, large numbers of fiber-shaped members are arranged so as to project out from the inner circumferences of the relief holes  39  to the inside diameter direction and are fastened to the inner circumferences of the relief holes  39  by adhesion etc.  
      As shown in  FIG. 10A , in the state with the cold air side opening  11   a  fully closed, the brush-shaped members  46  (fiber-shaped members) near the small diameter parts  25   b  of the windup shaft  25  are pushed by the outer circumferences of the small diameter parts  25   b  to elastically deform, whereby the small diameter parts  25   b  are inserted into the brush-shaped members  46 .  
      For this reason, the relief holes  39  of the first partition walls  37  are blocked by the brush-shaped members  46 , so cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      As shown in  FIG. 10B , when the windup shaft  25  moves in a direction approaching the fixed shaft  24  (right direction of  FIG. 9 ) and fully opens the cold air side opening  11   a , the windup shaft  25  moves to the right side of  FIG. 9  while the outer circumferences of the small diameter parts  25   b  push against the brush-shaped members  46  (fiber-shaped members) to elastically deform them.  
      For this reason, the relief holes  39  of the first partition walls  37  are blocked by the brush-shaped members  46 , so cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      In this way, in this embodiment, regardless of the opened or closed state of the cold air side opening  11   a , the relief holes  39  of the first partition walls  37  are blocked by the brush-shaped members  46  and cold air can be kept from flowing from the cold air passage  3   a  through the relief holes  39  to the windup shaft drive mechanisms  26 A and  26 B.  
      As a result, the same effects as in the fourth embodiment can be obtained.  
     Other Embodiments  
      Note that in the above embodiments, the bottom end of the cold air side opening panel  11  and the top end of the hot air side opening panel  12  are joined at a slight angle. Along with this, the base member  22  of the cassette type film door  14  is also formed slightly bent, but it is also possible to join the cold air side opening panel  11  and the hot air side opening panel  12  in a straight state. Along with this, the base member  22  of the cassette type film door  14  is also formed straight.  
      Further, in the above embodiments, the racks  29 , blocking walls  35 , first partition walls  37 , etc. are formed integrally with the base member  22  and the film-shaped members  23 , windup shafts  25 , pinions  30 , drive shafts  31 , etc. are attached to the base member  22 , and the thus assembled cassette type film door  14  is attached to the cold air side opening panel  11  and hot air side opening panel  12  at the air-conditioner case  1   a  sides, but it is also possible not to use the base member  22  and directly assemble separately formed racks  29 , blocking walls  35 , first partition walls  37 , etc. and film-shaped members  23 , windup shafts  25 , pinions  30 , drive shafts  31 , etc. at the cold air side opening panel  11  and hot air side opening panel  12  of the air-conditioner case  1   a  side.  
      Further, in the above embodiments, the drive shaft  31  of the cold air passage opening/closing unit  14   a  and the drive shaft  31  of the hot air passage opening/closing unit  14   b  are designed to be connected to the rotary shafts of the servo motors  33  and driven to rotate, but it is also possible to link the drive shaft  31  of the cold air passage opening/closing unit  14   a  and the drive shaft  31  of the hot air passage opening/closing unit  14   b  by a gear or other linkage mechanism and connect this linkage mechanism to the rotary shaft of one servo motor  33  so as to drive the rotation of the drive shaft  31  of the cold air passage opening/closing unit  14   a  and the drive shaft  31  of the hot air passage opening/closing unit  14   b  by a single servo motor  33 .  
      Further, in the above embodiments, in the windup shaft drive mechanism  26 A, the drive shaft  31  is arranged to project from the side wall of the rear side case member  1   d  to the outside (right side of  FIG. 4 ), but the drive shaft  31  may also be arranged at the inside from the side wall of the rear side case member  1   d  and the windup shaft drive mechanism  26 A stored as a whole in the air-conditioner case  1   a.    
      In this case, if arranging not only the rack  29  and pinion  30 , but also the blocking wall  35  so as to cover the drive shaft  31  from the air flow upstream side, in the same way as the above embodiments, the windup shaft drive mechanism  26 A can be prevented from being directly struck by the blown air.  
      Further, in the second embodiment, the film-shaped blocking members  43  are arranged at the left and right first partition walls  37  at the cold air passage  3   a  sides, but the film-shaped blocking members  43  may also be arranged at the left and right first partition walls  37  at the sides opposite to the cold air passage  3   a.    
      Further, in the second embodiment, the film-shaped blocking members  43  are arranged across the entire lengths of the first partition walls  37  in the height directions of the first partition walls  37  (direction perpendicular to paper surface in  FIG. 7 ), but the film-shaped blocking members  43  may also be arranged to overlap only the relief holes  39  in the height directions of the first partition walls  37 .  
      Further, in the third embodiment, the multilayer slide doors  44  are arranged at the left and right first partition walls  37  at the sides opposite to the cold air passage  3   a , but the multilayer slide doors  44  may also be arranged at the left and right first partition walls  37  at the cold air passage  3   a  sides.  
      Further, in the third embodiment, multilayer slide doors  44  are formed across the entire lengths of the first partition walls  37  in the height directions of the first partition walls  37  (direction perpendicular to the paper surface in  FIG. 8 ), but they may also be arranged to overlap only the relief holes  39  in the height directions of the first partition walls  37 .  
      Further, in the fifth embodiment, the brush-shaped members  46  are comprised of a large number of elastically deformable fiber-shaped members, but the brush-shaped members  46  may also be comprised of a large number of elastically deformable strip members.  
      While the invention has been described by reference to specific embodiments chosen for the purposes of illustration, it should be apparent that numerous modifications could be made thereto by those skilled in the art without departing from the basic concept and scope of the invention.