Patent Publication Number: US-6909580-B2

Title: Disk cartridge, disk device and shutter opening/closing mechanism including a rotating body

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to: a disk cartridge capable of rotatably accommodating a disk therein and of being loaded in a disk driving apparatus for recording a piece of information into the disk and for reproducing the piece of information recorded in the disk; a disk device comprising such a disk cartridge and a disk accommodated therein; and a shutter opening/closing mechanism for opening/closing a window for exposing a disk by moving a shutter. 
   2. Description of Related Art 
   As conventional recording media, there have been widely utilized: disk cartridges removably accommodating disks therein such as CD-ROM&#39;s (Compact Disc Read Only Memory); and those disk devices such as MO (Magneto-Optical), FD (Floppy Disc: Trade Mark), MD (Mini Disk), which include disk cartridges integrally and rotatably accommodating disks therein. Known as these disk cartridges and disk devices are those having structures such as shown in  FIGS. 11 and 12 . 
   The structure shown in  FIG. 11  is a disk device  105  comprising: a body case  102  rotatably accommodating a disk  101  therein, and formed with a window  103  for exposing a recording surface of the disk  101 ; and a shutter  104  moveably disposed on the body case so as to open/close the window. The shutter  104  of the disk device  105  is integrally provided with a belt  106  in the moving direction of the shutter, and this belt  106  has its tip end provided with a pawl portion  107 . The shutter  104  for opening the window  103  is further provided with a coil spring  108  for influencing a counteracting force or pulling force onto the shutter  104  in a direction opposite to the moving direction thereof. 
   The disk device  105  shown in  FIG. 11  is constituted such that this disk device  105  is inserted into a disk driving apparatus (not shown) for recording and reproducing a piece of information into and from the disk  101 , such that the pawl portion  107  of the belt  106  is engaged by a pin  110  protruded within a zone through which the disk device  105  placed in a transferring path is moved when the disk device is transferred up to a predetermined operational position by transferring structure disposed in the disk driving apparatus. This moves the belt  106  against the pulling force of the coil spring  108  dependently of the transferring movement of the disk device  105 , so that the shutter  104  is moved to open the window  103  to thereby expose the recording surface of the disk  101  at the operational position. 
   However, the shutter  104  of the constitution shown in  FIG. 11  is moved to open the window  103  to thereby expose the recording surface of the disk  101  thereby requiring a pin-like constitution for moving the belt  106  by engaging with the pawl portion  107  of the belt  106 , so that this disk device is allowed to be utilized only in a particular disk driving apparatus having such a pin-like component. Further, in such a disk driving apparatus constituted to directly load or place the disk device  105  into an operational position without any transferring structure for transferring the disk device  105 , there is required a constitution for moving a pin-like component relative to the disk device  105 , thereby requiring a passage space for passing the pin-like component and thus failing to downsize the disk driving apparatus. 
   Meantime, the structure shown in  FIG. 12  is a disk device  125  comprising: a body case  121  rotatably accommodating a disk (not shown) therein, and formed with a window  122  for exposing a recording surface of the disk; and a shutter  123  moveably disposed on the body case so as to open/close the window. The body case  121  of the disk device  125  is provided with a concaved portion  127  for forming a stepped portion between the shutter  123  and body case  121 , within a moving region of the shutter  123  and in a state where the shutter  123  closes the window  122 . Provided within the body case  121  is counteracting structure (not shown) for influencing a pulling force onto the shutter  123  in a direction opposite to the moving direction thereof for opening the window  122 . 
   Provided in a disk driving apparatus (not shown) for recording and reproducing a piece of information into and from the recording surface of the disk of the disk device  125  are: an insertion opening for inserting the disk device  125  therethrough; an operational position communicated with the insertion opening so as to record/reproduce the information; and a movement path for moving the disk device  125  therethrough from the insertion opening toward the operational position. The disk driving apparatus is further provided with shutter driver  131  for opening/closing the shutter  123  of the disk device  125  which is moving through the movement path, to thereby open/close the window  122 . This shutter driver  131  comprises: an arm portion  132  having one end rotatably disposed within the movement path, and the pivoted other end; a pin portion  133  disposed at the tip end or the one end of the arm portion  132 , so as to engage in the concaved portion  127  of the disk device  125  which moves through the movement path; and a coil spring  135  for influencing a pulling force onto the arm portion  132  in a direction opposite to the rotating direction of the arm portion  132  which is rotated as the disk device  125  is moved to the operational position. 
   In the case where the disk device  125  is to be inserted into the insertion opening of the disk driving apparatus, the concaved portion  127  is engaged with the pin portion  133  of the shutter driver  131  positioned in the movement path, so that the arm portion  132  is rotated as the disk device  125  is moved. This rotational movement pushingly moves the shutter  123 , so that the window  122  is opened at the operational position to thereby expose the recording surface of the disk. 
   However, in the constitution shown in  FIG. 12 , the shutter  123  is moved to open the window  122  to thereby expose the recording surface of the disk. This requires the shutter driver  131  having such a specific constitution comprising the arm portion  132 , which arm portion is rotatably disposed in the movement path of the disk device  125  and has the pin portion  133  to be engaged in the concaved portion  127  disposed in the disk device  125 . Thus, the disk device can be utilized exclusively in such a specific disk driving apparatus having the shutter driver  131 . Further, in such a disk driving apparatus constituted to directly load the disk device  125  into an operational position without moving the disk device  125 , there is required a constitution for engaging the pin portion  133  into the concaved portion  127  and rotating the arm portion  132 , thereby requiring a passage space for passing therethrough the arm portion  132  and thus failing to downsize the disk driving apparatus. 
   As described above, the scheme shown in  FIGS. 11 and 12  requires specific constitutions for moving the shutters  104 ,  123 , and is thus applicable to only those disk driving apparatuses having specific constitutions, thereby failing to improve versatility. Moreover, in those disk driving apparatuses which directly load the disk devices  105 ,  125  into operational positions, it is required to ensure passage spaces for passing therethrough those components for moving the shutters  104 ,  123 , thereby also failing to downsize the disk driving apparatuses. 
   SUMMARY OF THE INVENTION 
   It is therefore a main object of the present invention to provide a disk cartridge, a disk device and a shutter opening/closing mechanism, capable of avoiding a limitation to a single type of constitution for opening/closing a shutter, to thereby improve versatility and readily facilitate downsizing the disk driving apparatus. 
   The present invention provides a disk cartridge capable of rotatably accommodating therein a disk so as to be loaded into a disk driving apparatus for conducting at least one of operations for recording a piece of information into the disk and reproducing the information recorded in the disk, the disk cartridge comprising: a body case capable of rotatably accommodating the disk therein; a window opened in the body case so as to expose that surface of the accommodated disk which is to be or has been recorded with the piece of information; a shutter provided in the body case in a manner capable of opening/closing the window; a rotating body rotatably provided within the body case and including an outer peripheral surface exposed from the body case so as to be contacted with and rotated by the disk driving apparatus, in a state where the disk cartridge is loaded in the disk driving apparatus or in the course of loading movement of the disk cartridge into the disk driving apparatus; and shutter driver provided within the body case and for moving the shutter by the rotation of the rotating body to thereby open/close the window. 
   According to such a constitution, the body case capable of rotatably accommodating the disk therein is opened with the window for exposing that surface of the disk which is to be or has been recorded with the piece of information, and the shutter is provided in the manner capable of opening/closing the window. Further, there are provided: the rotating body provided within the body case and including the exposed outer peripheral surface, so as to be contacted with and rotated by the disk driving apparatus, in a state where the disk cartridge is loaded in the disk driving apparatus for recording a piece of information into or reproducing the information from the disk or in the course of loading movement of the disk cartridge into the disk driving apparatus; and the shutter driver for moving the shutter by the rotation of the rotating body to thereby open/close the window. This causes the rotating body to contact with and to be rotated by the disk driving apparatus upon loading the disk cartridge into the disk driving apparatus or in the loaded state, and the rotation of the rotating body is transmitted to the shutter through the shutter driver so as to move the shutter thereby opening/closing the window. This enables to open/close the shutter by any suitable constitution for rotating the rotating body in the course of loading movement of the disk cartridge into the disk driving apparatus or after loading, so that the constitution for opening/closing the shutter is not limited thereby improving the versatility. It is also possible to exemplarily contact the rotating body with a wall surface in the course of loading movement of the disk cartridge into the disk driving apparatus, thereby readily downsizing the disk driving apparatus where the constitution for opening/closing the shutter can be omitted from the disk driving apparatus or realized by the simple structure. 
   In the disk cartridge of the present invention, it is desirable that the rotating body comprises a gear. 
   According to such a constitution, the rotating body comprises the gear. This allows to readily utilize a general constitution adopting a rack and pinion constitution for converting the rotation of the rotating body into the linear movement of the shutter. Further, the rotating body can be assuredly rotated such as by a gear or rack without slippage, thereby allowing to efficiently and assuredly open/close the shutter. 
   In the disk cartridge of the present invention, it is desirable that the rotating body is disengageably contacted with and rotated by rotating structure provided in the disk driving apparatus. 
   According to such a constitution, the rotating structure provided in the disk driving apparatus disengageably contacts with and rotate the rotating body. This enables to open/close the shutter such as after loading the disk cartridge into the disk driving apparatus, thereby enabling to open/close the shutter without limiting the mounting direction of the disk cartridge into the disk driving apparatus to thereby improve the versatility. 
   In the disk cartridge of the present invention, it is desirable that the rotating body is engaged with a rack provided in the disk driving apparatus and is rotated by the movement of the disk cartridge upon loading into the disk driving apparatus. 
   According to such a constitution, the rotating body is engaged with the rack provided in the disk driving apparatus and is rotated by the movement of the disk cartridge upon loading into the disk driving apparatus. This allows to open/close the shutter by the simple constitution of the fixed rack without providing the disk driving apparatus with any specific constitution for opening/closing the shutter, thereby allowing to readily downsize the disk driving apparatus. 
   In the disk cartridge of the present invention, it is desirable that the shutter driver comprises: a shutter rack provided integrally with the shutter; and a pinion engaged with the shutter rack and rotated as the rotating body rotates. 
   According to such a constitution, there are provided, as the shutter driver, the shutter rack provided integrally with the shutter, and the pinion engaged with the shutter rack and rotated as the rotating body rotates. Thus, the pinion of the shutter driver is rotated as the rotating body is rotated upon loading the disk device into the disk driving apparatus such that the rack integrally provided on the shutter and engaged with the pinion is moved to thereby move the shutter, thereby allowing to obtain a constitution for opening/closing the shutter by the rotation of the rotating body by virtue of the simple structure to thereby readily downsize the disk device and improve the manufacturability thereof. 
   In the disk cartridge of the present invention, it is desirable that the shutter driver comprises: wind-up structure provided integrally with the rotating body; a string member having one end coupled to the shutter and the other end coupled to the wind-up structure so that the string member is wound up by the rotation of the rotating body to thereby pullingly move the shutter; and counteracting structure coupled to the shutter so as to influence a counteracting force onto the shutter in a direction opposite to the direction for pullingly moving the shutter by the string member. 
   According to such a constitution, the string member having one end coupled to the shutter and the other end coupled to the wind-up structure provided integrally with the rotating body is wound up by the rotation of the rotating body to thereby pullingly move the shutter thereby opening the window, and the shutter is moved back to close the window by the counteracting force by the counteracting structure in a direction opposite to the direction for pullingly moving the shutter when the rotation of the rotating body is released. This allows to readily obtain the constitution for opening/closing the shutter by the rotation of the rotating body and to use a small-sized space for accommodating the structure of the shutter driver therein, thereby readily downsizing the body case. 
   In the disk cartridge of the present invention, it is desirable that the disk cartridge further comprises rotation regulator disposed within the body case so as to separably contact with the rotating body to thereby restrict the rotation of the rotating body. 
   According to such a constitution, there is provided the rotation regulator for separably contacting with the rotating body to thereby restrict the rotation of the rotating body. This assuredly avoids such a situation that the rotating body is inadvertently rotated to move the shutter thereby opening the window to thereby expose the disk. Thus, the damage of the disk can be assuredly prevented. 
   In the disk cartridge of the present invention, it is desirable that the rotation regulator is separated from the rotating body, upon loading of the disk cartridge into the disk driving apparatus or in a state of the disk cartridge loaded in the disk driving apparatus. 
   According to such a constitution, the rotation regulator is separated from the rotating body, upon loading of the disk cartridge into the disk driving apparatus or in the state of the disk cartridge loaded in the disk driving apparatus. Thus, the rotation regulator contacts with the rotating body in a normal state to thereby avoid the movement of the shutter due to the rotation of the rotating body, while the rotation regulator is separated from the rotating body to thereby allow the rotating body to rotate upon conducting the operation for recording/reproducing the information in the disk driving apparatus, thereby resulting in that the disk is exposed only upon recording/reproducing the information thereby allowing to record/reproduce the information so that the disk can be assuredly protected in the normal state. 
   In the disk cartridge of the present invention, it is desirable that the body case includes a recessed portion at an outer surface of the body case; and that the rotating body is positioned and disposed in the recessed portion so as to allow an outer peripheral surface of the rotating body to be contacted with the disk driving apparatus. 
   According to such a constitution, the body case is provided with the recessed portion at the outer surface of the body case, and the rotating body is positioned and disposed in the recessed portion so as to allow the outer peripheral surface of the rotating body to be contacted with the disk driving apparatus. This allows by a simple constitution: to reliably avoid inadvertent contact with the rotating body from the exterior; to assuredly avoid a situation where the rotating body is rotated to thereby move the shutter thereby exposing the disk; and to reliably protect the disk. 
   The disk device of the present invention comprises: the aforementioned disk cartridge of the present invention, and a disk rotatably accommodated within the disk cartridge. 
   According to such a constitution, the disk device comprises the aforementioned disk cartridge of the present invention, thereby enabling to open/close the shutter by any suitable constitution for rotating the rotating body in the course of loading movement of the disk cartridge into the disk driving apparatus or after loading, so that the constitution for opening/closing the shutter is not limited thereby improving the versatility. It is also possible to exemplarily contact the rotating body with a wall surface in the course of loading movement of the disk cartridge into the disk driving apparatus, thereby readily downsizing the disk driving apparatus where the constitution for opening/closing the shutter can be omitted from the disk driving apparatus or realized by the simple structure. 
   The present invention further provides a shutter opening/closing mechanism for opening/closing a shutter of a disk cartridge, the disk cartridge comprising: a body case capable of rotatably accommodating a disk therein; a window opened in the body case so as to expose that surface of the accommodated disk which is to be recorded with a piece of information; and the shutter provided in the body case in a manner capable of opening/closing the window; the shutter opening/closing mechanism comprising: a rotating body rotatably provided within the body case and including an exposed outer peripheral surface; shutter driver provided within the body case and for moving the shutter by the rotation of the rotating body to thereby open/close the window; and rotating structure for contacting with the rotating body to thereby rotate the rotating body, in a state where the disk cartridge is loaded in an operational position for conducting at least one of operations for recording a piece of information into the disk and reproducing the information recorded in the disk, or in the course of loading movement of the disk cartridge into the operational position. 
   According to such a constitution, in the body case of the disk cartridge capable of rotatably accommodating the disk and provided with the shutter capable of opening/closing the window for exposing the disk, there are provided: the rotating body in the state for exposing its outer peripheral surface; and the shutter driver for opening/closing the window by moving the shutter by the movement of the rotating body. Further, the rotating structure is contacted with the rotating body to thereby rotate it, in the state where the disk cartridge is loaded in the operational position such as for recording a piece of information into the disk and reproducing the information recorded in the disk, or in the course of loading movement of the disk cartridge into the operational position. This allows to adopt any suitable constitution for rotating the rotating body for opening/closing the shutter such as upon loading the disk cartridge into the operational position for recording/reproducing the information, so that the constitution for opening/closing the shutter is no way restricted and the versatility is improved. It is also possible to exemplarily contact the rotating body with a wall surface in the course of loading movement of the disk cartridge into the disk driving apparatus, thereby readily downsizing the constitution for opening/closing the shutter such that the constitution for opening/closing the shutter is omitted from the disk driving apparatus for recording/reproducing the information or realized by the simple structure. 
   In the shutter opening/closing mechanism of the present invention, it is desirable that the rotating structure comprises rotation driver for disengageably contacting with the rotating body in the state where the body case is loaded in the operational position, to thereby rotate the rotating body. 
   According to such a constitution, the rotating structure comprises the rotation driver for disengageably contacting with the rotating body in the state where the body case is loaded in the operational position, to thereby rotate the rotating body. This enables to open/close the shutter such as after loading the disk cartridge into the operational position, thereby enabling to open/close the shutter without limiting the mounting direction of the body case into the disk driving apparatus to thereby improve the convenience. 
   In the shutter opening/closing mechanism of the present invention, it is desirable that the rotating structure comprises a rack provided along a moving direction of the body case into the operational position, the rack being engaged with the rotating body in the course of loading movement of the body case into the operational position to thereby rotate the rotating body. 
   According to such a constitution, the rotating structure is constituted by providing the rack provided along a moving direction of the body case into the operational position, and the rack is engaged with the rotating body in the course of loading movement of the body case into the operational position to thereby rotate the rotating body. This allows to open/close the shutter by the simple constitution of the fixed rack without providing the disk driving apparatus for recording/reproducing the information with any specific constitution for opening/closing the shutter, thereby allowing to readily downsize the constitution for opening/closing the shutter. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a plan view showing a partially cut-away constitution of a disk device according to an embodiment of the present invention; 
       FIG. 2  is a plan view showing the disk device; 
       FIG. 3  is a cross-sectional view showing a state where the disk device is loaded into a disk driving apparatus; 
       FIG. 4  is a plan view showing a state where the disk device is loaded into the disk driving apparatus, in which FIG.  4 (A) shows a state where the disk device is inserted into the disk driving apparatus, and FIG.  4 (B) shows a state where the window of the loaded disk device is opened; 
       FIG. 5  is a perspective view showing a state where the disk device is about to be loaded into the disk driving apparatus; 
       FIG. 6  is an explanatory view showing a rotation restricted state of a rotating body by rotation regulator, in which FIG.  6 (A) shows the rotation restricted state of the rotating body, FIG.  6 (B) shows a state terminating the rotation restriction, and FIG.  6 (C) shows a state having terminated the rotation restriction; 
       FIG. 7  is a plan view showing a state for loading the disk device into another disk driving apparatus, in which FIG.  7 (A) shows a state where the disk device is inserted into the disk driving apparatus, and FIG.  7 (B) shows a state where the window of the loaded disk device is opened; 
       FIG. 8  is a plan view showing a partially removed constitution of a disk device according to another embodiment of the present invention; 
       FIG. 9  is a plan view showing a partially cut-away constitution of a disk device according to yet another embodiment of the present invention; 
       FIG. 10  is a plan view showing a partially cut-away constitution of a disk device according to still another embodiment of the present invention; 
       FIG. 11  is an explanatory view showing an operation for opening/closing a shutter of a conventional disk device; and 
       FIG. 12  is an explanatory view showing an operation for opening/closing a shutter of another conventional disk device. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) 
   There will be described hereinafter an embodiment of the present invention, with reference to the accompanying drawings. 
   [Structure of Disk Device] 
     FIG. 1  is a plan view showing a partially cut-away disk device according to an embodiment of the present invention.  FIG. 2  is a plan view showing the disk device.  FIG. 3  is a partially cut-away cross-sectional view showing the disk device in a state where it is loaded into a disk driving apparatus.  FIG. 4  is an explanatory view for explaining an opening/closing situation of a shutter, in which FIG.  4 (A) is an explanatory view explaining a state just before opening a window, and FIG.  4 (B) shows a state where the window is opened.  FIG. 5  is a perspective view for explaining a situation where the disk device is about to be loaded into the disk driving apparatus.  FIG. 6  is an explanatory view showing a rotation restricted state of a rotating body, in which FIG.  6 (A) shows a state where the rotation of the rotating body is restricted, FIG.  6 (B) shows a state where the rotation restriction of the rotating body is terminated when inserted into the disk driving apparatus, and FIG.  6 (C) shows a state where the termination of rotation restriction of the rotating body is maintained. 
     FIGS. 1 through 3  show a disk device  1  comprising: a disk  2 ; and a disk cartridge  3  rotatably accommodating the disk  2  therein. Used as the disk  2  is an optical disk, magnetic disk or magnet-optical disk capable of optically or magnetically recording or recorded with a piece of information, such as DVD (Digital Versatile Disk) and CD-ROM (Compact Disc Read Only Memory). The disk  2  is in a substantially circular shape formed with a substantially circular axial hole  4  in a substantially center position of the disk, and is provided with a recording surface  5  to be recorded with or already recorded with a piece of information on one or both of the surfaces of the disk. This embodiment is also applicable to those disks each having only one-sided recording surface  5 . 
   Meanwhile, the disk cartridge  3  includes a body case  11  made of a synthetic resin. This body case  11  includes: an obverse-side case  11 A of a substantially flat box shape which opens at its one side such as the back surface side; and a reverse-side case  11 B of a substantially flat box shape which opens at its one side such as the obverse surface side so as to close the back surface side opening of the obverse-side case  11 A. Defined within the body case  11  by joining the obverse-side case  11 A and reverse-side case  11 B is a disk chamber  12  capable of rotatably accommodating the disk  2  therein. 
   Further, as shown in FIG.  4 (B), the body case  111  is opened with windows  14 . These windows  14  are formed in substantially the same shapes so as to open at positions such as corresponding to the obverse-side case  11 A and reverse-side case  11 B, respectively. Each window  14  is in a substantially rectangular shape opened to expose the disk  2  accommodated within the disk chamber  12  in an area from the outer periphery of the disk  2  toward the periphery of the central axial hole  4  of the disk  2 , and is opened over a region from the substantial center of the body case  11  toward the midsection of one edge portion of the body case. Further, the obverse surface and reverse surface of the body case  11  are provided with sliding recesses  15  in substantially rectangular recessed shapes, respectively, over a region from the substantial center including the window  14  toward the one side edge of the body case. 
   The windows  14  may have appropriate shapes such that: each window has a size to expose only the portion of the recording surface  5  of the disk  2  such as in an MD (Mini Disk); only one window is opened in that surface of the body case  11  which opposes to the recording surface  5  disposed at only one surface of the disk  2 ; or one and the other windows are in the shapes opened to expose only the recording surface  5  on one surface side and to expose an region from the vicinity of the axial hole  4  toward the recording surface  5  on the other surface side, respectively. In the situation where only the recording surface  5  is exposed, the body case  11  is to be provided with a hole so as to rotatingly drive the disk  2  by bringing the periphery of the axial hole  4  of the disk  2  into a state exposed to the exterior. 
   As shown in  FIGS. 1 through 6 , on the outer surface at the reverse surface of the reverse-side case  11 B, the body case  11  is provided with an operational-position determining groove  17  over a region from one edge side of the body case  11  where the window  14  is opened toward the opposing other edge side of the body case. This operational-position determining groove  17  is provided with guiding portions  17 A in the states outwardly spreading at the one edge portion and other edge portion of the body case  11 , respectively. As shown in  FIG. 3 , this operational-position determining groove  17  is formed in an opened state continued into the interior of the body case  11 . 
   As shown in  FIGS. 3 through 6 , the operational-position determining groove  17  is engaged in a slidable and disengageable manner with a guiding rib  19  disposed in a disk driving apparatus (not shown) for loading the disk device  1  therein so as to record a piece of information into and reproduce a piece of recorded information from the disk  2 . This guiding rib  19  is disposed on a movement guiding member  20  disposed in the disk driving apparatus so as to constitute a movement path for transferring and moving therethrough the disk device  1  inserted via insertion opening (not shown). This movement guiding member  20  is formed to have a substantially channel shaped cross section to include: a carrying plate  20 A for carrying the disk device  1  thereon; and a pair of guiding rails  20 B opposing to each other at substantially the same width dimension as the maximum width dimension of the disk device  1  so as to allow the disk device  1  to move between the guiding rails. The guiding rib  19  is protruded into a longitudinal rib shape in the direction for moving the disk device  1 , at the position on the carrying plate  20 A of the movement guiding member  20  and closer to the insertion opening. The guiding rib  19  is formed into a so-called tapered or converged shape having a tip end of a smaller diameter by chamfering both tip ends and both longitudinal edges of the guiding rib, and in a substantially ellipse shape in a plan view. 
   As shown in  FIGS. 1 ,  2 ,  4  and  5 , the body case  11  is provided with a shutter body  25  in a moveable manner. This shutter body  25  exemplarily comprises: a shutter  26  made of metal such as an aluminum alloy or made of a synthetic resin; and a shutter rack  27  provided integrally with the shutter  26 . 
   The shutter  26  is formed into a substantially deep channel shaped cross section to include: a pair of cover plate portions  26 A; and a coupling plate portion  26 B for integrally and continuously coupling these cover plate portions  26 A. Each cover plate portion  26 A is formed into a rectangular shape adapted to be moveably positioned within the sliding recess  15  so as to cover substantially half the surface of the sliding recess  15  to thereby close the window  14 . The coupling plate portion  26 B integrally and continuously joins longitudinal one ends of the cover plate portions  26 A together. The shutter  26  is provided to straddle the body case  11  from the sliding recess  15  of the obverse-side case  11 A to the sliding recess  15  of the reverse-side case  11 B. 
   The shutter rack  27  is formed into an elongated rod shape by the coupling plate portion  26 B. This shutter rack  27  is provided integrally with the coupling plate portion  26 B, in a manner extended into a direction opposite to the direction through which the shutter  26  is moved within the sliding recess  15 , in a state where the shutter  26  closes the window  14 . There is provided a rack  27 A on the longitudinal one surface of the shutter rack  27 , i.e., on that surface of the shutter rack  27  facing to the disk chamber  12  of the body case  11 , opposite to the surface of the surface of the shutter rack  27  joined to the coupling plate portion  26 B. Provided a both ends of the shutter rack  27  are sliding pawl portions (not shown) protruded from those side surfaces of the shutter rack which face to the cover plate portions  26 A, respectively. These sliding pawl portions are to prevent the shutter body  25  from falling from the body case  11 , by engaging with concave sliding groove portions (not shown of the body case  11  along the moving direction of the shutter  26 . 
   The shape of the shutter  26  is not limited to the substantially channel shaped cross section, and its design may be appropriately modified into any shape in a manner capable of opening/closing the window  14 . Similarly, the structure of the shutter body  25  is not to limited to be constituted of the shutter  26  and shutter rack  27 , and its design may be appropriately modified. 
   As shown in  FIGS. 1 through 6 , rotatably provided within the body case  11  is a rotating body  30 . This rotating body  30  is in a disc gear shape provided with gear teeth  30 A along the outer periphery of the rotating body. This rotating body  30  is provided in a rotatable manner by means of a rotation shaft  30 B disposed at the center of the rotating body  30 , in a state where the rotating body  30  is placed that one corner of the body case  11  which is deviated from the substantially circular disk chamber  112  such that the gear teeth  30 A at the outer periphery are exposed from the outer surface of the body case  11 . The rotation shaft  30 B for pivoting the rotating body  30  includes any constitution for rotatably pivoting the rotating body  30  to the body case  11 , such that the rotation shaft  30 B is integrally protruded from the body case  11  to thereby rotatably pivot the rotating body  30 , or the rotation shaft  30 B is provided integrally with the rotating body  30  so as to be rotatably supported by the body case  11 . 
   Provided within the body case  11  is shutter driver  35  at a position near the rotating body  30 , This shutter driver  35  disposed near the rotating body  30  and comprises: a first pinion  36  engaged with the rotating body  30 ; and a second pinion  37  engaged with the first pinion  36  and with the rack  27 A of the shutter rack  27 . This shutter driver  35  is to move the shutter body  25  provided with the shutter rack  27  engaged with the second pinion  37 , by rotating the first pinion  36  in the direction opposite to the rotating body  30  and by rotating the second pinion  37  in the same direction as the rotating body  30 , when the rotating body  30  is rotated. Note, these first pinion  36  and second pinion  37  may be rotatably pivoted in the same manner as the rotating body  30  by any means. 
   As shown in  FIGS. 1 ,  3  and  6 , provided within the body case  11  and near the rotating body  30  is rotation regulator  40  for restricting the rotation of the rotating body  30 . This rotation regulator  40  is exemplarily formed of an elastically deformable synthetic resin, and includes a body part  40 A in a rectangular column shape. This body part  40 A has its longitudinal one end rotatable in the direction to contact with and depart from the outer periphery of the rotating body  30 , by pivoting the other end of the body part  40 A to the body case  11 . This pivotable supporting may be achieved in the same manner as the rotating body  30  by any means. 
   Protruded from the surface of the axial one end portion of the body part  40 A is a rotation regulating pawl  40 B for opposing to the outer peripheral surface of the rotating body  30 . This rotation regulating pawl  40 B is formed into a substantially wedge shape in a manner engageable with and disengageable from the gear teeth  30 A at the outer peripheral surface of the rotating body  30 . 
   Provided at the axial other end of the body part  40 A of the rotation regulator  40  is an elongated rotation restricting portion  40 C along the axial direction. This rotation restricting portion  40 C is provided in a state where the tip end portion of the rotation restricting portion  40 C abuts on a positioning convex portion  42  protruded within the body case  11  at a position opposite to the position where the rotation regulator  40  is rotatably provided, with respect to the operational-position determining groove  17 . As shown in  FIG. 6 , this rotation restricting portion  40 C is formed to be capable of striding over the positioning convex portion  42  by elastically deforming in itself by abutting onto the guiding rib  19  disposed in the disk driving apparatus in a state where the rotation restricting portion  40 C abuts on the positioning convex portion  42 . Note, this rotation restricting portion  40 C may be constituted of a member separate from the body part  40 A such that only the rotation restricting portion  40 C is formed of an elastically deformable member integrally attached to the body part  40 A. 
   The rotation regulator  40  is provided with a torsion coil spring  43  as urging structure for urging the rotation regulating pawl  40 B in a direction for normally engaging with the rotating body  30 . The rotation regulator is not limited to the torsion coil spring  43 , and may be exemplarily constituted of any elastic member such as a leaf spring or rubber for urging the rotation regulating pawl  40 B of the rotation regulator  40  in a direction for normally engaging with the rotating body  30 . 
   This rotation regulator  40  is constituted such that the rotation regulating pawl  40 B thereof is engaged with the gear teeth  30 A at the outer peripheral surface of the rotating body  30  to thereby restrict the rotation of the rotating body  30  in a normal state by the restoring force comprising the urging force of the torsion coil spring  43  as shown in FIG.  6 (A) such that the shutter  26  of the shutter body  25  closes the window  14  as shown in FIG.  4 (A). 
   Upon loading the disk device  1  into the disk driving apparatus, the guiding rib  19  engages with the operational-position determining groove  17  and relatively moves within the operational-position determining groove  17  as the disk device  1  moves, thereby rendering the rotation restricting portion  40 C to abut onto the positioning convex portion  42 . Further movement of the disk device  1  causes the rotation regulator  40  to elastically deform as shown in FIG.  6 (B) and then to stride over the positioning convex portion  42 . In this state, the rotating body  30  falls into a state for engaging with an operation rack  45  acting as rotating structure disposed on the guiding rail  20 B of the movement guiding member  20  of the disk driving apparatus along the moving direction of the disk device  1  shown in FIG.  4 (A). 
   Further movement of the disk device  1  causes the guiding rib  19  to pass through the rotation restricting portion  40 C and then causes the rotation regulator  40  to be rotated by the restoring force of the torsion coil spring  43 , as shown in FIG.  6 (C). In this state, the rotation restricting portion  40 C again abuts onto the positioning convex portion  42 , so that the rotation regulating pawl  40 B is held, without engaging with the rotating body  30 , in a state of a free rotation of the rotating body  30 , i.e., in a state where the rotating body  30  is rotated by the operation rack  45  as the rotating body  30  moves. These rotating body  30 , shutter driver  35  and the operation rack  45  as the rotating structure cooperatively constitute a shutter opening/closing mechanism  48 . 
   [Operation of Disk Device] 
   There will be explained hereinafter the operation of the disk device  1  of the above embodiment. 
   As shown in  FIGS. 1 and 2 , the disk device  1  is positioned in a state where the shutter  26  of the shutter body  25  closes the window  14 , in a normal unused state. In this state, the rotation regulating pawl  40 B of the rotation regulator  40  engages with the gear teeth  30 A at the outer peripheral surface of the rotating body  30  by the restoring force of the torsion coil spring  43  as shown in FIG.  6 (A), to thereby restrict the rotation of the rotating body  30  such that the rotating body  30  is not rotated even by an action onto the rotating body  30  from the exterior. This avoids such a situation that the shutter body  25  is inadvertently moved to open the window  14  to thereby expose the recording surface  5  of the disk  2 . 
   Upon using the disk device  1 , i.e., upon recording a piece of information into or reproducing the recorded information from the disk  2  by the disk driving apparatus, the disk device  1  is inserted into the insertion opening (not shown) of the disk driving apparatus, while heading the shutter body  25  side of the disk device  1 . This insertion causes the guiding rib  19  disposed at the movement guiding member  20  of the disk driving apparatus to engage with the operational-position determining groove  17 . When the guiding rib  19  engages with the operational-position determining groove  17 , the guiding rib  19  is guided by the guiding portion  17 A at the end portion of the operational-position determining groove  17 . The guiding rib  19  is smoothly guided, since the tip end portion of the guiding rib  19  is formed into the converged shape by chamfering the tip ends of the guiding rib and in the substantially ellipse shape in the plan view. This allows the guiding rib  19  to assuredly engage with the operational-position determining groove  17  even when the disk device  1  is inserted in a slightly tilted manner, thereby allowing to duly position the disk device  1 . Note, it is possible to avoid an erroneous insertion of the disk device  1 , because the guiding rib  19  abuts onto the peripheral surface of the body case  11  when the disk device  1  was inserted into the insertion opening in an upside-down manner or a manner heading a portion other than the shutter body  25  side. 
   Further insertion of the disk device  1  in a forcible manner in a situation where the guiding rib  19  has engaged with the operational-position determining groove  17 , causes the guiding rib  19  to relatively move within the operational-position determining groove  17  to thereby abut onto the rotation restricting portion  40 C of the rotation regulator  40  as the disk device  1  is moved, thereby rotating the rotation regulator  40  against the restoring force of the torsion coil spring  43 . Further movement of the disk device  1  in its inserting direction causes the rotation restricting portion  40 C to abut onto the positioning convex portion  42  so that the rotation restricting portion  40 C is deformed to yield against its elasticity as shown in FIG.  6 (B). Further movement of the disk device  1  in its inserting direction causes the rotation restricting portion  40 C to stride over the positioning convex portion  42 . In this state, the rotating body  30  engages with the operation rack  45  of the movement guiding member  20  of the disk driving apparatus as shown in FIG.  4 (A). 
   Movement of the disk device  1  in its inserting direction, in the state where the rotating body  30  engages with the operation rack  45 , brings about a situation where the operation rack  45  relatively moves on the outer peripheral surface of the rotating body  30  correspondingly to the movement of the disk device  1 , so that the rotating body  30  is rotated. This rotation of the rotating body  30  rotates the first pinion  36  and second pinion  37  of the shutter driver  35 , so that the shutter body  25  having the shutter rack  27  engaged with the second pinion  37  is moved within the sliding recess  15  toward the rotating body  30  side. When the rotating body  30  is to be engaged with the operation rack  45  and to be rotated by the same, the guiding rib  19  prevents the disk device  1  from being moved in a direction separated from the operation rack  45 . Thus, the engaging state between the rotating body  30  and operation rack  45  can be assuredly maintained, so that the rotating body  30  is assuredly rotated by the operation rack  45  with the movement of the rotating body. 
   While the rotating body  30  is rotated and the shutter body  25  is moved by the insertion of the disk device  1 , the guiding rib  19  further moves within the operational-position determining groove  17  relative thereto and passes through the rotation restricting portion  40 C as shown in FIG.  6 (C). The passage of the guiding rib  19  through the rotation restricting portion  40 C causes the rotation regulator  40  to rotate by the restoring force of the torsion coil spring  43 , so that the rotation restricting portion  40 C again abuts onto the positioning convex portion  42  to thereby restrict the rotational movement of the rotation regulator  40 . In this state, the rotation regulating pawl  40 B of the rotation regulator  40  never engages with the rotating body  30 , so that the rotation of the rotating body  30  by the operation rack  45  is maintained to thereby move the shutter body  25  with the insertion of the disk device  1 . 
   As shown in FIG.  4 (B), the disk device  1  having been moved to a predetermined position, i.e., the operational position for recording a piece of information and/or reproducing the recorded information, is brought into a state where the window  14  is fully opened to thereby expose the recording surface  5  and the periphery of axial hole  4  of the disk  2 . Then, the rotation shaft (not shown) of the disk driving apparatus is inserted into the axial hole  4  of the disk device  1  and fixed thereto, so as to rotate the disk  2  by the rotation of the rotation shaft, thereby exemplarily conducting an operation for recording a piece of information and/or reproducing the information. 
   There will be explained hereinafter a situation for operating the disk device  1  in another disk driving apparatus. Such a disk driving apparatus exemplarily includes a constitution shown in FIG.  7 . 
   Namely, reference numeral  51  in  FIG. 7  designates a movement guiding member, and this movement guiding member  51  is formed into a substantially channel shaped cross section to include a carrying plate  51 A and a pair of guiding rails  51 B, in substantially the same shape as the movement guiding member  20  of the disk driving apparatus shown in FIG.  4  and FIG.  5 . 
   The carrying plate  51 A is provided with positioning ribs  52  protruded at the side of the moving direction of the disk device  1  so as to position the inserted disk device  1  at the operational position to thereby restrict the further movement of the disk device  1 . The carrying plate  51 A is protruded with a pair of guiding pins  53  engaged with the operational-position determining groove  17 , instead of the singular elongated guiding rib  19  of the disk driving apparatus shown in  FIGS. 4 and 5 . These guiding pins  53  are protruded at positions deviated from the position corresponding to the sliding recess  15 , in a state where the disk device  1  has been positioned by abutting onto the positioning ribs  52 . 
   One of the guiding rails  51 B is cut out and formed with a cut-out  55 , instead of the operation rack  45  of the guiding rail  20 B of the disk driving apparatus shown in  FIGS. 4 and 5 . This cut-out  55  is disposed at a position opposing to the rotating body  30  in a state where the disk device  1  has been positioned by abutting onto the positioning ribs  52 . 
   The disk driving apparatus is provided with rotation driver  60  as the rotating structure. This rotation driver  60  includes a seat portion  61 . This seat portion  61  is disposed within the disk driving apparatus in a manner capable of moving to and from, i.e., approaching and departing from a position adjacent to the movement guiding member  51  to thereby face to the cut-out  55 . 
   The seat portion  61  is integrally provided with an electric motor  62  as driving source. This electric motor  62  has its output shaft  62 A integrally provided with a driving gear  63 . Further, rotatably pivoted to the seat portion  61  is a drive transmission gear  64  engaged with the driving gear  63 . This drive transmission gear  64  can be rotatably pivoted in any means, identically with the rotating body  30 . 
   When the disk device  1  is to be operated by the disk driving apparatus shown in  FIG. 7 , the disk device  1  is inserted into the insertion opening (not shown) of the disk driving apparatus while heading the shutter body  25  side of the disk device, identically with the situation where the disk device is operated by the disk driving apparatus shown in  FIGS. 4 and 5 . This insertion causes the guiding pins  53  disposed on the movement guiding member  51  of the disk driving apparatus to be guided by and engaged with the guiding portion  17 A of the operational-position determining groove  17 , to thereby position the disk device  1 . 
   Further insertion of the disk device  1  in a forcible manner in a situation where the guiding pins  53  have engaged with the operational-position determining groove  17 , causes the guiding pins  53  to relatively move within the operational-position determining groove  17  to thereby rotate the rotation regulator  40  thereby terminating the rotation restriction of the rotating body  30 , identically with the situation for operating the disk device by the disk driving apparatus shown in  FIGS. 4 and 5 . 
   Further movement of the disk device  1  in its inserting direction in the state where the rotation restriction of the rotating body  30  has been terminated, causes the disk device  1  to abut onto the positioning ribs  52  so that the further movement of the disk device is restricted and thus the disk device  1  is positioned. By recognizing this positioning such as by a sensor or switch, the rotation driver  60  is integrally moved to a position adjacent to the movement guiding member  51 , so as to engage the drive transmission gear  64  with the rotating body  30  of the positioned disk device  1  facing to the cut-out  55 . In this state, the electric motor  62  is driven to thereby rotate the driving gear  63  together with the output shaft  62 A, so that the drive transmission gear  64  is rotated by the driving gear  63 . This rotation of the drive transmission gear  64  rotates the rotating body  30  so that the shutter body  25  is moved to thereby open the window  14  thereby exposing the recording surface  5  of the disk  2 , identically with the disk driving apparatus shown in  FIGS. 4 and 5 . 
   [Effect of Disk Device] 
   As described above, the above embodiment exhibits the following functions and effects. 
   Namely, the disk device  1  is provided by rotatably accommodating the disk  2  in the disk cartridge  3  in which the body case  11  capable of rotatably accommodating therein the disk  2  is opened with the windows  14  for exposing the recording surfaces  5  of the disk  2  recorded with the information and the shutter body  25  is provided in a manner capable of opening/closing the window  14 . In a state where the disk device  1  has been loaded in the disk driving apparatus for recording a piece of information into and/or reproducing the information recorded in the disk  2  or in the course of moving the disk device  1  into the operational position, the rotating body  30  rotatably provided within the body case  11  in a state for exposing the outer peripheral surface of the rotating body is contacted with and rotated by the operation rack  45  of the movement guiding member  20  shown in  FIGS. 4 and 5  or the drive transmission gear  64  of the rotation driver  60  shown in  FIG. 7  so that the shutter body  25  is moved by rotation of the rotating body  30  by the shutter driver  35  disposed within the body case  11  to thereby open/close the window  14 . This enables to open/close the window  14  even by the operation rack  45  and rotation driver  60  having mutually different constitutions by rotating the rotating body  30  to thereby move the shutter body  25  in the course of loading movement of the disk device into the disk driving apparatus or after the loading of the disk device, so that the constitution for opening/closing the shutter body  25  is not limited, thereby allowing to improve the versatility. 
   It is possible to rotate the rotating body  30  such as by contacting it with the operation rack  45  disposed on the wall surface or simply with the inner surface of the guiding rail  20 B in the course of loading movement into the disk driving apparatus as shown in  FIGS. 4 and 5 , thereby readily downsizing and lightening the disk driving apparatus where the constitution for opening/closing the shutter body  25  is omitted from the disk driving apparatus or realized by the operation rack  45  of a simple structure. 
   Then, the gear shape of the rotating body  30  allows to readily utilize a general constitution adopting a rack and pinion constitution for converting the rotation of the rotating body  30  into the linear movement of the shutter body  25 , to thereby simplify the constitution for opening/closing the shutter body  25 , thereby allowing to readily improve the manufacturability and realize lightening and downsizing. Further, the rotating body  30  can be assuredly rotated such as by a gear or rack without slippage, thereby allowing to efficiently and assuredly open/close the shutter body  25 . 
   Provided as the shutter driver  35  are: the shutter rack  27  integrally provided on the shutter body  25 ; and the first pinion  36  and second pinion  37  engaged with the rack  27 A of the shutter rack  27  and rotated with the rotation of the rotating body  30 . Thus, the first pinion  36  and second pinion  37  of the shutter driver  35  are rotated as the rotating body  30  is rotated upon loading the disk device  1  into the disk driving apparatus such that the rack  27 A integrally provided on the shutter body  25  and engaged with the second pinion  37  is moved to thereby move the shutter body  25 , thereby allowing to obtain a constitution for opening/closing the shutter body  25  by the rotation of the rotating body  30  by virtue of the simple structure to thereby readily downsize the disk device  1  and improve the manufacturability thereof. 
   There is provided the rotation regulator  40  for separably contacting with the rotating body  30  to thereby restrict the rotation of the rotating body  30 . This assuredly avoids such a situation that the rotating body  30  is inadvertently rotated in a normal state to move the shutter body  25  thereby opening the window  14  to thereby expose the disk  2 . Thus, the damage of the disk  2  can be assuredly prevented. 
   The rotation regulator  40  is disengaged from the rotating body  30 : in the course of loading movement into the disk driving apparatus which utilizes the disk device  1 ; and in the state where the disk device  1  has been loaded in the disk driving apparatus. Thus, the rotation regulator  40  contacts with the rotating body  30  in a normal state to thereby avoid the movement of the shutter body  25  due to the rotation of the rotating body  30 , while the rotation regulator  40  is separated from the rotating body  30  to thereby allow the rotating body  30  to rotate upon conducting the operation for recording/reproducing the information in the disk driving apparatus, thereby resulting in that the disk  2  is exposed only upon recording/reproducing the information thereby allowing to record/reproduce the information so that the disk  2  can be assuredly protected in the normal state. 
   The body case  11  is provided with the operational-position determining groove  17  for slidably engaging with the guiding rib  19  and guiding pin  53  disposed on the movement guiding members  20  and  51  of the disk driving apparatus, respectively. This allows to avoid a situation where the disk device  1  is caused to laterally escape by that acting force from the lateral side which rotates the rotating body  30  so as to move the shutter body  25 . This allows to assuredly move the shutter body  25  to thereby open/close the window  14 . 
   Further, the rotating body  30  is constituted to be assuredly acted by the operating force while the guiding rib  19  or guiding pin  53  of the disk driving apparatus is protruded into the operational-position determining groove  17  disposed on the body case  11 . This eliminates any protruded constitution of the disk device  1  to thereby promote the operability thereof, while allowing to exemplarily determine the inserting orientation of the disk device  1  in each disk driving apparatus, i.e., to avoid an erroneous insertion of the disk device  1  into the disk driving apparatus such as in an opposite or different orientation. 
   Further, the operational-position determining groove  17  is disposed at the position near the rotating body  30 , thereby assuredly preventing the disk device  1  from moving in an escaping manner, as compared with a situation where the disk device  1  is duly positioned by the pair of guiding rails  20 B of the movement guiding member  20  or  51  correspondingly to the width dimension of the body case  11  having a relatively large tolerance for dimension. This allows to obtain a state where the rotating body  30  is assuredly engaged such as with the operation rack  45  or rotation driver  60 , so that the rotating body  30  is assuredly rotated to thereby allow to openingly/closingly move the shutter body  25  in a reliable manner. Namely, the location for positioning the disk device  1  in its readily escaping direction is closer to the cooperating guiding rail  20 B, than the location of the remaining guiding rail  20 B for otherwise positioning the disk device  1  in its readily escaping direction. This allows to reduce dispersion of moving distances in the escaping direction of the disk device  1 , to thereby obtain a situation where the rotating body  30  is assuredly engaged with the rotating structure. 
   Moreover, the rotation driver  60  disposed on the disk driving apparatus is disengageably contacted with the rotating body  30  and then rotated, thereby allowing to open/close the shutter body  25  having been loaded into the disk driving apparatus such as shown in FIG.  7 . Thus, unlike the conventional constitution exemplarily shown in  FIGS. 11 and 12 , the loading direction of the disk device  1  into the disk driving apparatus is never limited, such as by appropriately setting the arranged position and/or moving direction of the rotation driver  60 , to thereby improve the versatility. 
   Meanwhile, the rotating body  30  is engaged with the operation rack  45  disposed in the disk driving apparatus and is rotated by the movement of the disk device upon loading the disk device  1  into the disk driving apparatus. This allows to open/close the shutter body  25  by the simple constitution of the fixed operation rack  45  without providing the disk driving apparatus with any specific constitution for opening/closing the shutter body  25 , thereby allowing to readily downsize the disk driving apparatus. 
   [Variation of Embodiment] 
   The present invention is not limited to the aforementioned embodiment, and embraces variations within a scope capable of achieving the object of the present invention. 
   Namely, the disk device  1  of the present invention is applicable to any disk  2  capable of reproducing and/or recording a piece of information. 
   Further, the disk device  1  is not limited to accommodate the disk  2  therein, and is utilized as the disk cartridge  3  for removably accommodating the disk  2 . 
   The rotation regulator  40  is not limited to the constitution for engaging its rotation regulating pawl  40 B with the rotating body  30  to thereby restrict the rotation of the rotating body. Namely, the rotation regulator may include any constitution for restricting the rotation such as by pressure-contacting, and may be even omitted. 
   The shutter driver  35  is not limited to the first pinion  36  and second pinion  37 , and may be realized by a constitution such as shown in FIG.  8 . Namely,  FIG. 8  shows shutter driver  70  including a string member  71  having one end coupled to the shutter  26  and the other end coupled to the rotation shaft  30 B of the rotating body  30  acting as windup structure. This string member  71  is wound around a pulley  72  positioned in the moving direction of the shutter body  25  within the body case  11  and disposed in a rotatable manner. Provided at the opposite side to the extending direction of the string member  71  is a coil spring  73  as counteracting structure. This coil spring  73  is provided in a state for influencing a pulling force as a restoring force onto the shutter  26  of the shutter body  25  so as to bring it into a normally closed state. 
   In the constitution shown in  FIG. 8 , the string member  71  is wound up onto the rotation shaft  30 B by the rotation of the rotating body  30  so as to pullingly moving the shutter body  25  against the pulling force as the restoring force of the coil spring  73 , to thereby open the window  14 . In case of closing the window  14 , the shutter body  25  is moved by the restoring force of the coil spring  73  by releasing the tensile force acting on the string member  71 , such as by disengaging the operation rack  45  or the drive transmission gear  64  of the rotation driver  60  from the rotating body  30  or by driving the electric motor into a state for reversely rotating the drive transmission gear  64 . 
   The constitution shown in  FIG. 8  allows to readily provide the shutter driver  70  within the body case  11  without interfering with the disk  2 , thereby downsizing the disk device  1 . Note, the wind-up structure and rotating body may be constituted in any suitable manner, such as by forming them into a bobbin comprising the rotation shaft  30 B provided with a pair of flange-like collars at both ends, respectively, such that the collars act as the rotating body, and such that the wind-up structure includes a wind-up area comprising the outer peripheral surface area of the rotation shaft  30 B between the collars. The bobbin shape allows the string member  71  to be reliably wound up by the wind-up structure to thereby avoid such a situation that the string member  71  is disengaged from the rotation shaft  30 B and jammed to thereby stop the movement of the shutter body  25  and/or to thereby damage the string member  71 . 
   Further, the shutter driver may be achieved: by exemplarily adopting a plurality of pinions  77  as shown in  FIG. 9  such that three pinions  77  constitute shutter driver  78  for moving the shutter body  25  into the opposite or faraway direction by transmitting the rotation of the rotating body  30  to the shutter rack  27  via pinions  77 ; by moving the shutter body by adopting pulleys and an endless belt; or by moving the shutter body by combining these pulleys and endless belt with the pinions  77 . 
   It is not limited to adopt the guiding rib  19  and guiding pins  53  such as in the shape of rib and pin, respectively, and it is possible to adopt members in any shape including a wall shape capable of positioning or to provide a plurality of members like the guiding pins  53 . 
   Further, the rotating structure has been explained to be constituted of the rotation driver  60  including the seat portion  61  provided with the electric motor  62  having the driving gear  63  and with the drive transmission gear  64  for engaging with and disengaging from the rotating body  30  such that the seat portion and gears are integrally moved to engage the drive transmission gear with the rotating body  30 . However, it is constitutionally possible that the rotating structure is not moved and is previously disposed in a position for engaging with a disk device, and the disk device is to be engaged with the drive transmission gear when the disk device is inserted into the disk driving apparatus so that the rotation restriction of the rotating body is duly terminated and the disk device is moved to a predetermined position such as the operational position. Moreover, the driving gear  63  has been engaged with the drive transmission gear  64  so as to rotate the rotating body  30 . However, the rotating body  30  can be rotated by any suitable constitution such as by: providing the output shaft  62 A with a pulley and providing the drive transmission gear with a drive transmission pulley to thereby put an endless belt around these pulleys; directly engaging the driving gear  63  with the rotating body  30 ; or providing a looped belt gear comprising an endless belt having a toothed outer peripheral surface so as to engage this belt gear with the rotating body  30 . 
   The outer peripheral surface of the rotating body  30  has been provided to be protruded and exposed from the outer edge of the body case  11 . However, it is possible to provide the rotating body  30  in a state exemplarily shown in  FIG. 10  by providing protector  81  for covering the rotating body  30  in an axial direction such that the rotating body  30  is not protruded beyond the outer edge of the body case  11  but the outer peripheral surface of the rotating body  30  is exposed to the exterior. 
   Namely, as shown in  FIG. 10 , the body case  11  is provided with a recessed portion  82  in a shape of recessed groove along the length of its one side surface in the inserting direction of the body case  11 . The rotating body  30  is provided in a state where the outer peripheral surface of the rotating body is not protruded beyond the edge portion of the recessed portion  82  but positioned within the recessed portion  82 . In this state, the side wall portions defining the recessed portion  82  serve as the protector  81 . The operation rack  45  is formed to have a width dimension capable of moving within the recessed portion  82 . Upon insertion into the disk driving apparatus, the operation rack  45  is brought into a state for relatively moving within the recessed portion  82  so that the operation rack  45  engages with the rotating body  30  to thereby rotate the same, thereby opening/closing the window  14  by the shutter body  25 . 
   The constitution shown in  FIG. 10  allows: to avoid inadvertent contact with the rotating body  30  from the exterior such as by hand; to avoid an inadvertent rotation and damage of the rotating body  30 ; and to restrict the rotation of the rotating body  30  by a simple structure even without providing a specific constitution such as the rotation regulator  40 . Further, the rotating body  30  is not protruded, thereby allowing to improve the external appearance. Note, the recessed portion  82  is not restricted to the constitution to be provided over the entire length of the one side surface of the body case  11 . Namely, the recessed portion may be limited to only that area where the rotating body  30  is located, when the rotation driver  60  is exclusively utilized as the rotating structure of the disk driving apparatus without adopting the operation rack  45 . In such a situation, the protector constituted of the recessed portion  82  may be also limited to only that area where the rotating body  30  is located. 
   The disk driving apparatus may be achieved by any suitable constitution such as by directly loading or placing the disk device  1  onto an operational position without providing the movement guiding members  20 ,  51 , or by plurally providing the movement guiding members  20 ,  51 . 
   Although the operational-position determining groove  17  has been explained to be provided, it is not impossible to omit it. Nonetheless, in case that the rotating body  30  is rotated such as by engagement of a gear or by pressure-contact to thereby move the shutter  26  by this rotation such that the rotating body  30  is provided at a side surface of the body case  11  in the moving direction of the body case  11 , the rotating structure is rendered to laterally engage or pressure-contact with the rotating body so that the body case together with the rotating body particularly tends to be laterally forced in an escaping manner thereby tending to fail to obtain a sufficient rotation of the rotating body, which sufficient rotation is to be inherently provided by the inserting movement of the body case or disk device. Thus, in case of adopting the rotating body  30 , it is preferable to engage the guiding rib  19  or guiding pin  53  with the operational-position determining groove  17  particularly provided near the rotating body  30 . 
   The operational-position determining groove  17  and the guiding rib  19  and guiding pin  53  have been provided in the body case  11  and movement guiding members  20 ,  51 , respectively. However, it is possible to adopt an exchanged or reverse constitution, and the concave and convex may be in any suitable shapes capable of engaging with and disengaging from each other to thereby conduct positioning. Further, the positioning constitution may be achieved such as by positioning the disk device  1  between the guiding rails  20 B of the movement guiding member  20 , without providing the disk device  1  with a specific constitution such as the operational-position determining groove  17 . 
   In addition, the concrete structure and procedures such as upon practicing the present invention may be modified or altered to other ones insofar as the object of the present invention is achieved.