Abstract:
A vehicle door structure equipped with a slide door that opens and closes a partial area of a door opening portion provided in a side portion or a rear portion of a vehicle body and a swing door that opens and closes the other partial area of the door opening portion along with the slide door, the vehicle door structure comprising: a slide door handle that is provided in the slide door so as to open and close the slide door; a swing door lock mechanism that locks the swing door to the vehicle body when the swing door is fully closed; and a swing door lock release mechanism that releases the locking of the swing door with respect to the vehicle body when the full opened state of the slide door is detected.

Description:
CROSS-REFERENCE TO RELATED APPLICATION: 
     This application is claiming priority based on Japanese Patent Application No. JP 2013-086585, filed Apr. 17, 2013, the contents of all of which are incorporated herein by reference in their entirety. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a vehicle door structure that includes a slidable opening/closing type slide door and a swingable opening/closing type swing door. 
     2. Related Background Art 
     For example, a vehicle door structure disclosed in Japanese Patent Application Laid-Open No. 2011-46271 is known as a vehicle door structure of the related art. The vehicle door structure disclosed in Japanese Patent Application Laid-Open No. 2011-46271 includes a slide door that opens and closes a front area of a rear door opening portion, a swing door that opens and closes a rear area of the rear door opening portion along with the slide door, an outer handle that is provided in an outer surface of the slide door and is used to open and close the slide door, an inner handle that is provided in an inner surface of the slide door and is used to open and close the slide door, and an opening and closing handle that is provided in a front edge of the swing door and is used to open and close the swing door. The slide door slides in the longitudinal direction of the vehicle body through a slide mechanism. The swing door rotates with respect to the vehicle body through a hinge mechanism while overlapping the slide door. Further, the vehicle door structure includes a swing door opening and closing regulation mechanism that connects (locks) the swing door and the vehicle body to each other when the swing door is fully closed. 
     However, the following problems exist in the related art. That is, there is a need to open the swing door by the operation of the opening and closing handle when the locking between the swing door and the vehicle body is released. Accordingly, there is a need to switch the outer handle or the inner handle to the opening and closing handle when the slide door is opened and then the swing door is opened, and hence the operation efficiency is degraded. 
     An object of the present invention is to provide a vehicle door structure capable of improving the efficiency of an operation of opening a slide door and then opening a swing door. 
     SUMMARY OF THE INVENTION 
     According to one embodiment of the present invention, there is provided a vehicle door structure equipped with a slide door that opens and closes a partial area of a door opening portion provided in a side portion or a rear portion of a vehicle body and a swing door that opens and closes the other partial area of the door opening portion along with the slide door, the vehicle door structure including: a slide door handle that is provided in the slide door so as to open and close the slide door; a lock unit that locks the swing door to the vehicle body when the swing door is fully closed; and a lock release unit that releases the locking of the swing door with respect to the vehicle body when the full opened state of the slide door is detected. 
     In this way, in the vehicle door structure according to one embodiment of the present invention, if the full opened state of the slide door is detected when the slide door is opened by the operation of the slide door handle in a state where the swing door is locked to the vehicle body, the swing door may be opened by releasing the locking of the swing door with respect to the vehicle body. Accordingly, since there is no need to switch the slide door handle when the slide door is opened and then the swing door is opened, the operation efficiency may be improved. 
     In one embodiment, the vehicle door structure may further include a slide door opening and closing regulation unit that regulates the operation of opening and closing the slide door before the slide door is fully opened. In this case, the position of the slide door may be maintained and fixed at the step before the slide door is fully opened. Accordingly, this configuration is effective in a case where only the slide door is opened and closed without opening and closing the swing door. 
     In one embodiment, the vehicle body may be provided with a first slide rail that extends in the slide door opening and closing direction, the swing door may be provided with a second slide rail that extends in the slide door opening and closing direction, the slide door may be provided with a first guide body guided by the first slide rail and a second guide body guided by the second slide rail, and the slide door opening and closing regulation unit may be configured as a plurality of protrusion portions that are provided in at least one of the first slide rail and the second slide rail and regulate a roller of at least one of the first guide body and the second guide body in the slide door opening and closing direction. In this case, the slide door opening and closing regulation unit may be realized by a simple configuration. 
     In one embodiment, the lock unit may include a lock member that is provided in the swing door and an engagement portion that is provided in the vehicle body and engages with the lock member, and the lock release unit may include a detection component that is provided in the slide door, a rotation member that is rotatably provided in the swing door and engages with the detection component when the slide door is fully opened, and a connection member that connects the lock member to the rotation member. In such a configuration, if the detection component contacts the rotation member so as to rotate the rotation member when the slide door is opened, it is detected that the slide door is fully opened. At this time, when the lock member is separated from the engagement portion through the connection member by the rotation of the rotation member, the locking of the swing door with respect to the vehicle body is released. 
     In one embodiment, the swing door may be provided with a slide rail that extends in the slide door opening and closing direction, the slide door may be provided with a guide body that is guided by the slide rail, and the detection component may be the guide body. In this case, since the full opened state of the slide door is detected when the existing guide body contacts the rotation member so as to rotate the rotation member, the number of components does not increase. 
     In one embodiment, the slide door may be provided with a protrusion portion that protrudes toward the swing door, and the detection component may be the protrusion portion. In this case, when the protrusion portion contacts the rotation member so as to rotate the rotation member, the full opened state of the slide door is detected. At this time, the full opened state of the slide door may be detected with high precision by providing the protrusion portion at an appropriate position of the slide door. 
     In one embodiment, the lock unit may include a lock member that is provided in the swing door and an engagement portion that is provided in the vehicle body and engages with the lock member, and the lock release unit may include a sensor that detects whether the slide door is fully opened and a drive unit that moves the lock member so that the lock member is separated from the engagement portion when the sensor detects that the slide door is fully opened. When the sensor and the drive unit are used in this way, it is possible to electrically detect the full opened state of the slide door and release the locking of the swing door with respect to the vehicle body even when a complex structure is not particularly provided. 
     According to the present invention, it is possible to improve the efficiency of the operation of opening the slide door and then opening the swing door. Thus, the swing door handle is not needed, and hence the merchantability may be improved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view illustrating a vehicle that includes an embodiment of a vehicle door structure according to the present invention. 
         FIGS. 2A to 2C  are perspective views illustrating a state where a slide door and a swing door illustrated in  FIG. 1  are opened. 
         FIG. 3  is a schematic enlarged view illustrating a position that includes a lower slide rail and a guide body illustrated in  FIGS. 2A to 2C . 
         FIG. 4  is a schematic enlarged view illustrating a position that includes a middle slide rail and a guide body illustrated in  FIGS. 2A to 2C . 
         FIG. 5  is a schematic enlarged view illustrating a state where a perpendicular roller of the guide body is restrained by a protrusion portion of the lower slide rail illustrated in  FIG. 3 . 
         FIG. 6  is a schematic enlarged view illustrating a state where the perpendicular roller of the guide body is restrained by a protrusion portion of the middle slide rail illustrated in  FIG. 4 . 
         FIGS. 7A and 7B  are views illustrating a swing door lock release mechanism along with the middle slide rail and the guide body illustrated in  FIGS. 2A to 2C . 
         FIGS. 8A and 8B  are views illustrating a part of the swing door lock release mechanism illustrated in  FIGS. 7A and 7B  along with a swing door lock mechanism. 
         FIG. 9  is a cross-sectional view taken along the line IX-IX of  FIGS. 7A and 7B . 
         FIG. 10  is a view illustrating a swing door handle that is provided in the swing door as a comparative example. 
         FIG. 11  is a view illustrating a modified example of the swing door lock release mechanism illustrated in  FIGS. 7A and 7B  as another embodiment of the vehicle door structure according to the present invention. 
         FIG. 12  is a view illustrating another modified example of the swing door lock release mechanism illustrated in  FIGS. 7A and 7B  as still another embodiment of the vehicle door structure according to the present invention. 
         FIG. 13  is a view illustrating the arrangement position of the swing door lock release mechanism illustrated in  FIG. 12 . 
         FIG. 14  is a view illustrating still another modified example of the swing door lock release mechanism illustrated in  FIGS. 7A and 7B  as still another embodiment of the vehicle door structure according to the present invention. 
         FIG. 15  is a view illustrating a part of the swing door lock release mechanism illustrated in  FIG. 14  along with the swing door lock mechanism. 
         FIGS. 16A to 16C  are views illustrating the structure of a lock member illustrated in  FIG. 15 . 
         FIG. 17  is a view illustrating a modified example of the swing door lock release mechanism illustrated in  FIGS. 8A and 8B  as still another embodiment of the vehicle door structure according to the present invention along with the swing door lock mechanism. 
         FIG. 18  is a view illustrating the arrangement position of a proximity switch illustrated in  FIG. 17 . 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, preferred embodiments of a vehicle door structure according to the present invention will be described in detail by referring to the drawings. Furthermore, in the drawings, the same reference numerals will be given to the identical or equivalent components, and the repetitive description thereof will not be repeated. 
       FIG. 1  is a side view illustrating a vehicle that includes an embodiment of the vehicle door structure according to the present invention. In the same drawing, a vehicle door structure  1  of this embodiment is applied to a side portion of a vehicle body  2 . The side portion of the vehicle body  2  is provided with a front door opening portion  3  that is located at the lateral side of a front seat and a rear door opening portion  4  that is located at the lateral side of a luggage compartment provided at the rear side of the front seat. The front door opening portion  3  is opened and closed by a front door  5 . 
     The rear door opening portion  4  is opened and closed by a slidable opening/closing type slide door  6  and a swingable opening/closing type swing door  7 . As illustrated in  FIGS. 2A and 2B , the slide door  6  is adapted to open and close the front area of the rear door opening portion  4  while sliding in the longitudinal direction of the vehicle body  2 . In a state where the slide door  6  is fully opened, the slide door  6  is located at the outside of the swing door  7  so as to overlap the swing door  7  (see  FIG. 2B ). 
     In a state where the slide door  6  is fully opened, the swing door  7  is adapted to open and close the rear area of the rear door opening portion  4  while rotating rotates with respect to the vehicle body  2  as illustrated in  FIG. 2C  along with the slide door  6 . 
     The outer surface of the slide door  6  is provided with an outer door opening and closing handle  8 , and the inner surface of the slide door  6  is provided with an inner door opening and closing handle  9 . The opening and closing handles  8  and  9  are slide door handles that are used to open and close the slide door  6 . 
     The vehicle door structure  1  includes slide support mechanisms  11 A to  11 C that slidably support the slide door  6  in the longitudinal direction of the vehicle body  2  and a rotation support mechanism  12  that rotatably supports the swing door  7  with respect to the vehicle body  2 . 
     The slide support mechanism  11 A includes an upper slide rail  13  that is provided in the upper portion of the vehicle body  2  so as to extend in the longitudinal direction of the vehicle body  2  (the opening and closing direction of the slide door  6 ) and a guide body  14  that is provided in the upper portion of the front end of the slide door  6  and is guided by the upper slide rail  13  when the slide door  6  is opened and closed. 
     The slide support mechanism  11 B includes a lower slide rail  15  that is provided in the lower portion of the vehicle body  2  so as to extend in the longitudinal direction of the vehicle body  2  and a guide body  16  that is provided in the lower portion of the front end of the slide door  6  and is guided by the lower slide rail  15  when the slide door  6  is opened and closed. As illustrated in  FIG. 3 , the guide body  16  includes a horizontal roller  41  and a perpendicular roller  42 . The horizontal roller  41  and the perpendicular roller  42  are rotatably supported by a bracket  43  (see  FIG. 2C ) attached to the slide door  6 . A latch  44  is attached to the bracket  43 . Furthermore, although not illustrated in the drawings, the guide body  14  also includes a horizontal roller  41  and a perpendicular roller  42 . 
     The slide support mechanism  11 C includes a middle slide rail  17  that is provided in the swing door  7  so as to extend in the longitudinal direction of the vehicle body  2  and a guide body  18  that is provided in the rear end of the slide door  6  and is guided by the middle slide rail  17  when the slide door  6  is opened and closed. As illustrated in  FIG. 4 , the guide body  18  includes a pair of front and rear horizontal rollers  33  and a perpendicular roller  34 . The perpendicular roller  34  is disposed between the horizontal rollers  33 . 
     The rotation support mechanism  12  includes two upper and lower hinges  24  that rotatably connect the swing door  7  to a rear pillar  23  that is provided in the rear end of the vehicle body  2 . 
     Further, the vehicle door structure  1  further includes two upper and lower door lock mechanisms  25  that lock the slide door  6  and the swing door  7  when the slide door  6  is fully opened so that the slide door  6  overlaps the swing door  7 . 
     As illustrated in even  FIG. 3 , the door lock mechanism  25  includes a latch  44  that is attached to each of the upper and lower portions of the front end of the slide door  6  and a striker  26  that is attached to each of the upper and lower portions of the front end of the swing door  7  so as to engage with the latch  44 . 
     When the slide door  6  is fully opened so that the latch  44  engages with the striker  26 , the slide door  6  is locked to the swing door  7 . Furthermore, the locking between the slide door  6  and the swing door  7  may be released when the slide door  6  is closed by the operation of the opening and closing handles  8  and  9 . 
     When the state where the slide door  6  and the swing door  7  are locked to each other is released, the upper and lower guide bodies  14  and  16  are separated from the rear ends of the upper slide rail  13  and the lower slide rail  15 . For this reason, the slide door  6  is supported only by the swing door  7  through the door lock mechanism  25 , the middle slide rail  17 , and the guide body  18 , and hence may be rotated along with the swing door  7 . 
     Further, the vehicle door structure  1  includes two upper and lower swing door lock mechanisms  27  that lock the swing door  7  to the vehicle body  2  when the swing door  7  is fully closed. The swing door lock mechanism  27  includes a bar-type lock member  28  that is attached to each of the upper and lower portions of the swing door  7  and a striker  29  (see  FIG. 2C ) that is attached to each of the upper and lower portions of the vehicle body  2  so as to engage with the lock member  28 . 
     When the swing door  7  is fully closed, the lock member  28  protrudes from the swing door  7  toward the vehicle body  2  so as to engage with the striker  29  by a biasing force of a spring (not illustrated), so that the swing door  7  is locked to the vehicle body  2  (see  FIG. 8A ). 
     Further, as illustrated in  FIGS. 3 and 4 , the vehicle door structure  1  includes a slide door opening and closing regulation mechanism  50  that regulates the operation of opening and closing the slide door  6  immediately before the slide door  6  is fully opened. Furthermore, the slide door opening and closing regulation mechanism  50  is not illustrated in  FIG. 1 . The slide door opening and closing regulation mechanism  50  includes a pair of front and rear protrusion portions  51  (see  FIG. 3 ) that is provided in the lower portion of the lower slide rail  15  and restrains the perpendicular roller  42  of the guide body  16  in the longitudinal direction of the vehicle body  2  and a pair of front and rear protrusion portions  52  (see  FIG. 4 ) that are provided in the lower portion of the middle slide rail  17  and restrains the perpendicular roller  34  of the guide body  18  in the longitudinal direction of the vehicle body  2 . 
     When the slide door  6  is opened, the perpendicular roller  42  is restrained by each protrusion portion  51  in the longitudinal direction of the vehicle body  2  as illustrated in  FIG. 5 , and the perpendicular roller  34  is restrained by each protrusion portion  52  in the longitudinal direction of the vehicle body  2  as illustrated in  FIG. 6 . Accordingly, the operation of opening and closing the slide door  6  is regulated so that the position of the slide door  6  is maintained and fixed before the slide door  6  is fully opened. Further, as illustrated in  FIGS. 3 and 4 , when the slide door  6  is further opened so that the perpendicular roller  42  runs over each protrusion portion  51  and the perpendicular roller  34  runs over each protrusion portion  52 , the slide door  6  may be fully opened. 
     Further, as illustrated in  FIGS. 7A to 8B , the vehicle door structure  1  includes a swing door lock release mechanism  60  that releases the locking of the swing door  7  with respect to the vehicle body  2  when detecting a state where the slide door  6  is fully opened so that the slide door  6  is locked to the swing door  7 . Furthermore, the swing door lock release mechanism  60  is not illustrated in  FIG. 1 . A part of the swing door lock release mechanism  60  is formed by the guide body  18  provided in the slide door  6 . 
     As illustrated in  FIGS. 7A to 9 , the guide body  18  is attached to a front end of an arm  32  that is substantially formed in an L-shape. The arm  32  is rotatably connected to the slide door  6  so as to extend toward the inside of the vehicle body  2  (toward the swing door  7 ). The guide body  18  includes the horizontal roller  33  and the perpendicular roller  34 . The horizontal roller  33  is rotatably supported by a shaft portion  35  attached to the upper side of the arm  32 . The perpendicular roller  34  is rotatably supported by a shaft portion  37  that is attached to the lower side of the arm  32  through a bracket  36 . 
     Further, as illustrated in  FIGS. 7A to 9 , the swing door lock release mechanism  60  includes a rotation lever  38  that is swingably (rotatably) attached to the swing door  7  through a shaft portion  38   a  and engages with a head portion  37   a  of the shaft portion  37  of the guide body  18  and a cable  39  that connects the rotation lever  38  to the lock member  28  of each swing door lock mechanism  27 . The front end of the rotation lever  38  enters the middle slide rail  17  through a notch portion  17   a  formed in the outer portion of the middle slide rail  17 . One end of the cable  39  is connected to the base end of the rotation lever  38 . Furthermore, as illustrated in  FIG. 7A , the rotation lever  38  is generally maintained in a state where the rotation lever enters the middle slide rail  17  by a biasing force of a spring (not illustrated). 
     Here, when the slide door  6  is opened while being slid toward the rear side of the vehicle body  2  in a state where the swing door  7  is locked to the vehicle body  2  by the swing door lock mechanism  27 , it is detected that the slide door  6  is not fully opened and the slide door  6  and the swing door  7  are not locked to each other at the step before the shaft portion  37  of the guide body  18  contacts the rotation lever  38  as illustrated in  FIG. 7A . 
     Then, when the slide door  6  is further opened so that the shaft portion  37  of the guide body  18  contacts the rotation lever  38  so as to press the rotation lever  38  inward as illustrated in  FIG. 7B , it is detected that the slide door  6  is fully opened and the slide door  6  and the swing door  7  are locked to each other. At this time, the rotation lever  38  rotates so that the cable  39  is pulled toward the rotation lever  38 . For this reason, as illustrated in  FIG. 8B , the lock member  28  is separated from the striker  29  against a biasing force of a spring (not illustrated) so as to be retracted into the swing door  7 , and hence the locking between the swing door  7  and the vehicle body  2  is released. Thus, the swing door  7  may be opened. 
     Incidentally, when the swing door  7  is opened, the swing door  7  is opened after the slide door  6  is fully opened as illustrated in  FIGS. 2A to 2C . At this time, in a case where the swing door lock release mechanism  60  is not provided, when the slide door  6  is fully opened and a swing door handle  90  provided in the front end of the swing door  7  is operated as illustrated in  FIG. 10 , the locking between the swing door  7  and the vehicle body  2  is released, so that the swing door  7  is opened. In this case, since the outer door opening and closing handle  8  or the inner door opening and closing handle  9  needs to be switched by the swing door handle  90 , a problem arises in that the workability is degraded. 
     On the contrary, in this embodiment, when it is detected that the slide door  6  is fully opened and the slide door  6  and the swing door  7  are locked to each other, the swing door  7  may be opened at the time point in which the slide door  6  is fully opened since the swing door lock release mechanism  60  is provided so as to release the locking of the swing door  7  with respect to the vehicle body  2 . For this reason, the swing door  7  may be opened by directly using the outer door opening and closing handle  8  or the inner door opening and closing handle  9  after the slide door  6  is fully opened by operating the outer door opening and closing handle  8  or the inner door opening and closing handle  9 . Thus, since there is no need to switch the outer door opening and closing handle  8  or the inner door opening and closing handle  9  at each time, the operation efficiency may be improved. Further, since the swing door handle  90  illustrated in  FIG. 10  is not needed, the merchantability may be improved. 
     Further, since there is provided the slide door opening and closing regulation mechanism  50  that regulates the operation of opening and closing the slide door  6  immediately before the slide door  6  is fully opened, the position of the slide door  6  may maintained and fixed while the swing door  7  is locked to the vehicle body  2  and the slide door  6  is opened by a predetermined amount. Accordingly, in a case where a luggage is carried into or out of the luggage compartment by opening and closing only the slide door  6  while the swing door  7  is not opened and closed, there is no need to lock the slide door  6  and the swing door  7  at each time. Thus, the operation efficiency may be further improved. 
       FIG. 11  is a view illustrating a modified example of the swing door lock release mechanism  60  illustrated in  FIGS. 7A and 7B  as another embodiment of the vehicle door structure according to the present invention. In the same drawing, the swing door lock release mechanism  60  of this modified example includes a detection protrusion portion  61  that is fixed to the inner side surface of the slide door  6 . The protrusion portion  61  is formed so as to enter the middle slide rail  17 . Further, the protrusion portion  61  is disposed at the front side of the guide body  18  in the slide door  6 . 
     Further, the swing door lock release mechanism  60  includes the rotation lever  38  and the cable  39  as in the above-described embodiment. The rotation lever  38  is a rotation member that engages with the protrusion portion  61 . 
     In such a swing door lock release mechanism  60 , when the protrusion portion  61  contacts the rotation lever  38  so as to press the rotation lever  38 , the slide door  6  is fully opened and the slide door  6  and the swing door  7  are locked to each other. At this time, since the rotation lever  38  rotates so that the cable  39  is pulled toward the rotation lever  38  as in the above-described embodiment, the lock member  28  is separated from the striker  29  so that the locking between the swing door  7  and the vehicle body  2  is released. 
       FIG. 12  is a view illustrating another modified example of the swing door lock release mechanism  60  illustrated in  FIGS. 7A and 7B  as still another embodiment of the vehicle door structure according to the present invention. In the same drawing, the swing door lock release mechanism  60  of this modified example is provided in the upper portions of the front ends of the slide door  6  and the swing door  7  as illustrated in  FIG. 13 . Furthermore, the swing door lock release mechanism  60  may be provided in the lower portions of the front ends of the slide door  6  and the swing door  7 . 
     The swing door lock release mechanism  60  includes a detection protrusion portion  65  that is fixed to the inner side surface of the upper portion of the front end of the slide door  6 . The rotation lever  38  is rotatably attached to the upper portion of the front end of the swing door  7 . The rotation lever  38  is a rotation member that engages with the protrusion portion  65 . Further, the swing door lock release mechanism  60  includes the cable  39 . 
     In such a swing door lock release mechanism  60 , when the protrusion portion  65  contacts the rotation lever  38  so as to press the rotation lever  38 , the slide door  6  is fully opened and the slide door  6  and the swing door  7  are locked to each other. At this time, since the rotation lever  38  rotates so that the cable  39  is pulled toward the rotation lever  38  as in the above-described embodiment, the lock member  28  is separated from the striker  29  so that the locking between the swing door  7  and the vehicle body  2  is released. 
       FIG. 14  is a view illustrating still another modified example of the swing door lock release mechanism  60  illustrated in  FIGS. 7A and 7B  as still another embodiment of the vehicle door structure according to the present invention. In the same drawing, the swing door lock release mechanism  60  of this modified example includes a rod  70  instead of the cable  39 . One end of the rod  70  is connected to the base end of the rotation lever  38 . As illustrated in  FIG. 15 , the other end of the rod is branched into two parts. Further, the swing door lock release mechanism  60  includes a rotation type lock member  71  instead of the bar-type lock member  28 . 
     As illustrated in  FIGS. 16A to 16C , the lock member  71  is accommodated inside a housing  75  attached to the swing door  7 . The lock member  71  includes a latch portion  72  and a rod receiving portion  73  that engages with the latch portion  72 . The housing  75  is provided with a striker introduction portion  75   a  into which the striker  29  is introduced and a rod introduction portion  75   b  into which the rod  70  is introduced. The latch portion  72  is rotatably supported by the swing door  7  through the shaft portion  72   a . The rod receiving portion  73  is rotatably supported by the swing door  7  through the shaft portion  73   a . The latch portion  72  is biased by a spring (not illustrated) in a counter-clockwise direction, and the rod receiving portion  73  is biased by a spring (not illustrated) in a clockwise direction. 
     In such a swing door lock release mechanism  60 , the rod  70  does not contact the rod receiving portion  73  as illustrated in  FIG. 16A  before the shaft portion  37  of the guide body  18  contacts the rotation lever  38 , that is, the slide door  6  is fully opened. In this state, when the rod receiving portion  73  engages with the latch portion  72  and the latch portion  72  engages with the striker  29  against a biasing force of a spring (not illustrated), the swing door  7  is locked to the vehicle body  2 . 
     As illustrated in  FIG. 14 , the shaft portion  37  of the guide body  18  contacts the rotation lever  38  so as to press the rotation lever  38  and the slide door  6  is fully opened, the rod  70  is pulled toward the lock member  71  by the rotation of the rotation lever  38 . Then, as illustrated in  FIG. 16B , since the rod  70  presses the rod receiving portion  73 , the rod receiving portion  73  rotates in a counter-clockwise direction (see the arrow A) against a biasing force of a spring (not illustrated) and the engagement between the rod receiving portion  73  and the latch portion  72  is released. As a result, as illustrated in  FIG. 15 , the locking between the swing door  7  and the vehicle body  2  is released, so that the swing door  7  may be opened. 
     Then, as illustrated in  FIG. 16C , when the swing door  7  is opened, the engagement between the latch portion  72  and the striker  29  is released by the movement of the swing door  7 , so that the latch portion  72  rotates in a counter-clockwise direction by a biasing force of a spring (not illustrated) (see the arrow B). 
       FIG. 17  is a view illustrating still another modified example of the swing door lock release mechanism  60  illustrated in  FIGS. 8A and 8B  as still another embodiment of the vehicle door structure according to the present invention along with the swing door lock mechanism  27 . In the same drawing, the swing door lock release mechanism  60  of this modified example includes a proximity switch  80  and two drive units  81  instead of the rotation lever  38  and the cable  39 . 
     As illustrated in  FIG. 18 , the proximity switch  80  is disposed in the rear end of the swing door  7 . The proximity switch  80  is a switch that detects whether the slide door  6  is fully opened by detecting whether the guide body  18  approaches. When the guide body  18  does not approach the proximity switch  80 , that is, the slide door  6  is not fully opened, the proximity switch  80  becomes an off state. Meanwhile, when the guide body  18  approaches the proximity switch  80 , that is, the slide door  6  is fully opened, the proximity switch  80  becomes an on state. 
     Each drive unit  81  is configured as an electromagnetic solenoid connected to the proximity switch  80 . When the proximity switch  80  becomes an off state, the drive unit  81  causes the lock member  28  to engage with the striker  29 . Then, when the proximity switch  80  becomes an on state, the drive unit  81  moves the lock member  28  in a direction in which the lock member is separated from the striker  29 . Furthermore, the drive unit  81  may be configured by the combination of, for example, an electric motor and a gear or a ball screw. 
     In this way, in this embodiment, when it is detected that the slide door  6  is fully opened and the slide door  6  and the swing door  7  are locked to each other, the locking of the swing door  7  with respect to the vehicle body  2  is electrically released. 
     Furthermore, the present invention is not limited to the above-described embodiment. For example, in the embodiment illustrated in  FIGS. 7A ,  7 B, and  14 , the shaft portion  37  of the guide body  18  becomes a detection component that engages with the rotation lever  38 . However, for example, the detection protrusion portion that engages with the rotation lever  38  may be provided in the shaft portion  37 . 
     Further, in the above-described embodiment, the slide door opening and closing regulation mechanism  50  includes the pair of front and rear protrusion portions  51  provided in the lower portion of the lower slide rail  15  and the pair of front and rear protrusion portions  52  provided in the lower portion of the middle slide rail  17 , but may include any one of the protrusion portions  51  and  52 . 
     Further, in the above-described embodiment, the slide door  6  is adapted to open and close the front area of the rear door opening portion  4 , and the swing door  7  is adapted to open and close the rear area of the rear door opening portion  4  along with the slide door  6 . However, the vehicle door structure of the present invention may be applied to a vehicle in which the slide door  6  is adapted to open and close the rear area of the rear door opening portion  4  and the swing door  7  is adapted to open and close the front area of the rear door opening portion  4  along with the slide door  6 . Further, the vehicle door structure of the present invention may be applied to a vehicle that includes a slide door and a swing door that are used to open and close a door opening portion provided in the rear portion of the vehicle body  2 .