Abstract:
A disk device comprises first and second disk selection projections  102, 103  which regulate an angle of the disk conveyed to a small or large disk positioning recess  121, 122  on the basis of an outer radius of the disk. The first and second disk selection projections have tapered faces  102   a,    103   a  provided at fixed intervals on a disk guiding face  101   a  facing the conveying roller  111.  The disk device further comprises steps  121   a,    122   a  for positioning the small disk  201  or the large disk  200  having an angle regulated in accordance with the outer radius to the small disk positioning recess  121  or to the large disk positioning recess  122.

Description:
CROSS-REFERENCE TO THE RELATED APPLICATION 
     This Application is a continuation of International Application No. PCT/JP99/00597, whose International filing date is Feb. 12, 1999, the disclosures of which Application are incorporated by reference herein. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a disk device having a positional determination mechanism which can use disks of various outer diameters. 
     2. Description of the Related Art 
     A conventional disk device, in particular a disk device which can use disks of various outer diameters, needs a disk loading device for conveying the disks of various outer diameters to a turntable and for performing the positional determination. Such a disk loading device is generally complicated in that it has a positional determination mechanism which can use the disks of various sizes. This furthermore increases the overall size of the device. 
     FIGS. 1 through 12 show such a disk loading device. In the figures,  301  and  302  are guide levers,  303  is a disk guide plate,  303   a  is a refuge guide section,  304  is a slider,  305  is a link lever,  306  and  307  are guide levers,  306   a  and  307   a  are guide pins,  308  is an arm,  310  is a clamp,  311  is a clamp arm,  311   a  is a small disk stopper,  312   a  is a large disk stopper,  312  is a base,  313  is a turntable,  314  is a spindle motor,  315  is a transfer roller,  316  is a top plate,  317  is a player cabinet,  317   a  is a front face into which a disk is inserted,  318  is a spring. 
     A front face aperture  317   a  into which disks are inserted is provided in the front face of the player cabinet  317 . As shown by FIG. 3, a guide lever  301 ,  302  which detects the size of the disk, a slider  304  which displaces in tandem with the guide lever  301 ,  302  as shown in FIG. 1, an arm  308  which engages due to the displacement of the slider  304 , a guide lever  306 ,  307  which guides a disk into the device, a link lever  305  which is opened and closed by connection to the guide lever  306 ,  307 , and a disk guide plate  303  which guides the upper face of the disk are mounted on the upper plate  316  provided in the player cabinet  317 . 
     A refuge guide  303   a  which projects so that a large disk can avoid the small disk stopper  311   a  is provided on the disk guide plate  303 . On the lower section of the disk guide plate  303 , a transfer roller  315  is provided to displace the disk and the turntable  313  is provided behind the transfer roller  315 . In addition, a spindle motor  314  which drives the turntable  313  and a base  312  to fix the above components are also provided on the lower section. 
     Above the turntable  313 , a clamp  310  is provided which positions and holds an inserted disk on the turntable by the central hole of the disk. The clamp  310  is supported on the clamp arm  311  which rotates about the shaft  312   b  on the base  312 . A stopper  311   a  is provided which determines the position of a small disk on the clamp arm  311 . Another stopper  312   a  is provided on the base  312  to determine the position of a large disk. 
     The operation of the conventional disk device will be explained below. 
     A disk inserted into a conventional disk loading device is transferred in the horizontal direction in contact with the face of the disk guide plate  303  by the disk guide plate  303  and the transferring roller  315 . 
     FIGS. 5 through 8 represent a small disk A as inserted into a device. The outer periphery of the inserted small disk A abuts with the guide pins  301   a,    302   a  of the guide lever  301 ,  302  as shown in FIG.  5 . The guide lever  301 ,  302  is extended as the small disk A is transferred inwardly. A slider  304  which engages with the linking pins  301   b,    302   b  of the guide lever  301 ,  302  displaces in a direction of the arrow D. As shown in FIG. 6 when a small disk is inserted the bent projection  304   a  of the slider  304  and the sloping section  308   c  of the arm  308  do not engage. 
     When a small disk is transferred, the outer periphery of the small disk A abuts with the guiding pins  306   a,    307   a  of the guiding lever  306 ,  307  as shown in FIG.  7 . As the guiding lever  306 ,  307  is enlarged, the disk abuts with the small disk stopper  311   a  and its position is determined. 
     The arm  308  is displaced in direction E as shown in FIG. 8 by the sliding lever  308 . The guiding pins  306   a,    307   a  which are in abutment with the outer periphery of the small disk A due to the arm  308  separate from the outer periphery of the small disk A and lock the guiding lever  306 ,  307 . The guiding lever  301 ,  302  is returned to the pre-extension position by the spring  318  when the small disk A is displaced inwardly. 
     FIGS. 9 through 12 show the device with a large diameter disk inserted. The outer periphery of the inserted large disk B abuts with the guide pins  301   a,    302   a  of the guide lever  301 ,  302  as shown in FIG.  9 . The guide lever  301 ,  302  is extended as the large disk B is transferred inwardly as shown in FIG. 10. A slider  304  which engages with the linking pins  301   b,    302   b  of the guide lever  301 ,  302  displaces in the direction of the arrow D. The bent projection  304   a  of the slider  304  and the sloping section  308   c  of the arm  308  engage. The rotational range of the guiding lever  306 ,  307  is adapted to the radius of the large disk B by displacing the arm  308  in the direction D. 
     When a large disk is transferred inwardly, the outer periphery of the large disk B abuts with the guiding pins  306   a,    307   a  of the guiding lever  306 ,  307  as shown in FIG.  11 . As the guiding lever  306 ,  307  is enlarged, the face of the large disk B abuts with the refuge guide  303   a  which projects from the disk guide plate  303 , and the direction of displacement of the large disk B is varied from a horizontal direction to an downwardly inclined direction by the projecting refuge guide  303   a.  Even if the large disk B is transferred further inwardly by the conveying roller  315 , it is not stopped by the small disk stopper  311   a  and its position is determined by abutment with the large disk stopper  312   a.    
     The arm  308  is displaced in the direction of the arrow E as shown in FIG. 12 by the slide lever in the same way as when handling a small disk A. The guiding pins  306   a,    307   a  of the guiding lever  306 ,  307  are separated from the outer periphery of the large disk B and the guiding lever  306 ,  307  is locked. The guiding lever  301 ,  302  is returned to a position before enlargement by the spring  318  in the same way as when handling a small disk A. 
     Since a conventional disk device is constructed as above, the problem of increases in structural complexity has arisen in order to deal with CDs of different diameters such as 8 cm or 12 cm CDs. This is a result of providing the small disk stopper refuge mechanism for determining the refuge position of a small disk stopper of an 8 cm disk with respect to a 12 cm disk. 
     SUMMARY OF THE INVENTION 
     The present invention is proposed to solve the above problems and has the object of providing a simplified structure for positioning disks having different sizes. 
     The disk device of the present invention comprises a conveying roller for conveying circular disks of differing sizes, a disk guiding section facing the conveying roller and guiding the disk, a disk selection mechanism having projections which are provided in proximity with the conveying roller, the projections being disposed at predetermined positions of the disk guiding section for selectively abutting with a surface of the disk inserted between the conveying roller and the disk guiding section depending on an outer radius of the disk, thereby changing an angle of the disk in the conveying direction depending on the outer radius, and a positional determination mechanism for positioning the disk, the angle of which is regulated by the disk selection mechanism, to respective predetermined positions preset in accordance with the outer radius of the disk. 
     As a result, a simple mechanism is obtained which can position the inserted disk to a predetermined position in the device depending on the outer diameter of the disk and which can initiate a disk clamp action with respect to the disk by positioning the disk to the predetermined position. 
     The disk device of the present invention is provided with a disk selection mechanism which regulates an angle of a large disk in the conveying direction upon conveying the large disk so that the large disk abuts only with a large disk position determination section in the positional determination mechanism. When a small disk is conveyed, the disk selection mechanism regulates an angle of the small disk in the conveying direction so that the small disk abuts only with a small disk position determination section in the positional determination mechanism. 
     In this way, a difference in the angle of the disk with respect to the conveying direction is generated between disks of different outer diameters. A disk conveyed into the disk device abuts with a position determination section for small disk or for large disk depending on its outer diameter, is positioned in a predetermined position in accordance with on the outer radius of the disk and is conveyed to the fixed position which depends on the outer radius of the inserted disk. 
     The disk device according to the present invention is provided with a disk selection mechanism which is adapted to place the small disk in a position where the small disk does not abut with projections when the small diameter disk is positioned by the positional determination mechanism. 
     In this way, a simple mechanism is realized for positional determination to a fixed position, which depends on the outer diameter of the disk, of a disk inserted in a state in which the outer edge of the disk abuts with the edge of the disk insertion mouth. In addition, the initiation of disk clamp action with respect to disks the position of which has been fixed is also enabled. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows a conventional disk loading device. 
     FIG. 2 shows a conventional disk loading device. 
     FIG. 3 shows a conventional disk loading device. 
     FIG. 4 shows a conventional disk loading device. 
     FIG. 5 shows a conventional disk loading device. 
     FIG. 6 shows a conventional disk loading device. 
     FIG. 7 shows a conventional disk loading device. 
     FIG. 8 shows a conventional disk loading device. 
     FIG. 9 shows a conventional disk loading device. 
     FIG. 10 shows a conventional disk loading device. 
     FIG. 11 shows a conventional disk loading device. 
     FIG. 12 shows a conventional disk loading device. 
     FIG. 13 is a three dimensional view showing a disk selection mechanism in a disk device according to a first embodiment of the present invention. 
     FIG. 14 is a three dimensional representation of the positional relationship between a disk selection mechanism and a conveying roller of a disk device according to a first embodiment of the present invention. 
     FIG. 15 is a three dimensional view showing a situation that a large diameter disk is inserted into the disk insertion mouth of a disk selection mechanism in a disk device according to a first embodiment of the present invention. 
     FIG. 16 is a three dimensional view showing a situation that a large diameter disk being conveyed by the conveying roller into the disk device according to a first embodiment of the present invention. 
     FIG. 17 is a three dimensional view showing a situation that a large diameter disk is positioned by a disk selection mechanism of a disk device according to a first embodiment of the present invention. 
     FIG. 18 is a plan view of the positioned situation of the large diameter disk, seen from the conveying roller side, in a disk selection mechanism of a disk device according to a first embodiment of the present invention. 
     FIG. 19 is a three dimensional view showing a situation that a small diameter disk is inserted into the disk insertion mouth of the disk selection mechanism in a disk device according to a first embodiment of the present invention. 
     FIG. 20 is a three dimensional view showing a situation that a small diameter disk is positioned into a small disk positioning recess of a disk selection mechanism in a disk device according to a first embodiment of the present invention. 
     FIG. 21 is a three dimensional view showing a situation that a small disk is inserted in an off-center position towards one end of the disk insertion mouth in the disk device according to a first embodiment of the present invention. 
     FIG. 22 is a three dimensional view accurately showing the angle of the small disk, as shown in FIG. 21, in the conveying direction in a disk device according to the first embodiment of the present invention. 
     FIG. 23 shows the disk device shown in FIG. 21 as seen from below in a first embodiment of the present invention. 
     FIG. 24 is a three dimensional view showing the abutment of a the peripheral face of the small disk with the step of the small disk positioning recess when a small disk is conveyed into a disk device according to the first embodiment of the present invention. 
     FIG. 25 is a three dimensional view showing the abutment of the peripheral face of the small disk with the step of the small disk positioning recess when a small disk is conveyed into a disk device according to the first embodiment of the present invention. 
     FIG. 26 shows the disk device of FIGS. 24 and 25 as seen from below in the first embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In order to explain the invention in greater detail, the preferred embodiments of the invention are outlined below with reference to the accompanying figures. 
     Embodiment 1 
     FIG. 13 is a three dimensional representation of a disk selection mechanism  100  in a disk device according to a first. embodiment of the present invention, which selects and positions for example a small diameter (8 cm) disk or a large diameter (12 cm) disk. In the figures,  101  is a disk insertion mouth,  102  is a first disk selection projection formed on both corners of the disk insertion surface in the inner face  101   a  of the disk insertion mouth  101  for selecting a small disk and a large disk.  103  is a second disk selection projection which is connected to the first disk selection projection  102  in the direction of disk insertion. The first and second disk selection projections  102 ,  103  are connected having a fixed gap in the direction of disk insertion. The conveying roller  111  is placed above the gap as shown in FIG.  14 . An interval is, formed in a direction which intersects with the direction of disk insertion between the first disk selection projections  102  which are formed on both corners of the disk insertion surface in the inner face  101   a  of the disk insertion mouth  101 . This interval is slightly larger than the diameter of a small disk. A tapered face  102   a  is formed on the first disk selection projection  102  so as to be raised at a fixed angle from the direction of disk insertion. A tapered face  103   a  is formed on the second disk selection projection  103  so as to be raised at a fixed angle from the direction of disk insertion. 
     FIG. 14 shows the positional relationship between the disk selection mechanism  100  and the conveying roller  111 . A disk is inserted between the conveying roller  111  and the inner face  101   a  of the disk insertion mouth  101  and between the conveying roller  111  and the first disk selection projection  102 . 
     When the inserted disk is of a small diameter, the small disk does not mount the tapered face  102   a,    103   a  of the first and second selection projections  102 ,  103 . The small disk is conveyed into the device in a horizontal state by the conveying roller  111  between the conveying roller  111  and the inner face  101   a  of the disk insertion mouth  101 . FIG. 19 is a three dimensional representation of a small disk  201  inserted from the disk insertion mouth  101 . 
     FIG. 15 is a three dimensional representation of the insertion of a large diameter disk into the disk insertion mouth. FIG. 16 is a three dimensional representation of a large diameter disk being conveyed by the conveying roller  111  into the disk device. In the figures, the reference numeral  200  denotes a large disk. As shown in these figures, when the inserted disk is of a large diameter, the large disk  200  mounts the tapered face  102   a,    103   a  of the first and second selection projections  102 ,  103 . The disk is conveyed into the device by the conveying roller  111  between the conveying roller  111  and the tapered face  102   a,    103   a.  At this time, the large disk  200  is conveyed into the device by the tapered face  102   a,    103   a  not in a horizontal state but with the leading edge in the direction of insertion inclining downwardly. 
     In FIG. 13,  121  is a small disk positioning recess for positioning the small disk conveyed into the device by the conveying roller  111  in a predetermined position. Small disk, which is conveyed in a horizontal state into the device by the conveying roller  111 , is guided and placed in a fixed position by the abutment of the edge of the disk with the step  121   a  which is formed on the small disk positioning recess  121 . FIG. 20 shows a three dimensional representation of a small disk as fixed into the recess  121  for positioning the small disk  201 . The peripheral edge of the small disk  201  which has been fixed into the recess  121  for positioning the small disk abuts with a small disk pin  1  to be discussed below. In this way, the disk is clamped and placed on the turntable by the clamp lever. 
     In FIG. 13,  122  is a large disk positioning recess for positioning a large disk conveyed into the device by the conveying roller  111 . Large disk, which is conveyed by the conveying roller  111  into the device with the leading edge of the disk slanting downwards, is guided and placed in a fixed position as shown in FIG. 17 by the abutment of the edge of the disk with the step  122   a  formed on the large disk positioning recess  122 . FIG. 18 is a plan view of the fixed position of a large diameter disk  200  in the large disk positioning recess  122  as seen from the conveying roller  111  (not shown). The peripheral edge of the large disk  200  fixed into the large disk positioning recess  122  abuts with the large disk abutting pin  2  to be explained below and clamps and places the disk on the turntable with the clamp lever. 
     As a result, a notch (not shown) is formed on the disk selection mechanism  100  in order to enable the clamp lever to clamp from above the center of a small disk  201  fixed into the small disk positioning recess  121  or a large disk  200  fixed into the large disk positioning recess  122 . 
     Next, the operation of the invention will be explained when a large disk or a small disk is inserted from approximately the center of the disk insertion mouth  101 . 
     (Operation of Disk Insertion from Approximate Center of Disk Insertion Mouth  101 ) 
     When a large disk is inserted from approximately the center of the disk insertion mouth  101 , the large disk  200 , as shown in FIG. 15, mounts the tapered face  102   a,    103   a  of the first and second disk selection projections  102 ,  103  in FIG.  14 . The leading edge is slanted downwardly as shown in FIG. 16 in the direction of insertion between the tapered faces  102   a,    103   a  and the conveying roller  111 . 
     Since the disk selection mechanism  100  is disposed above the conveying roller  111  as shown in FIG. 15, it is adapted so that the peripheral edge of the large disk  200  does not abut with the small disk abutting pin (not shown) and is conveyed further into the device by the conveying roller  111 . The large disk abuts with the large disk abutting pin (not shown) before being placed in the large disk positioning recess  122  as shown in FIGS. 17 and 18. In this way, a lever (not shown) is rotated. 
     On the other hand, when the inserted CD is a small radius disk, the small radius disk  201 , as shown in FIG. 19, does not ride on the tapered faces  102   a,    103   a  of the second disk selection projections  103  and the first disk selection projections  102  in FIG.  14 . The disk is conveyed between the conveying roller  111  and the inner face  101   a  of the disk insertion mouth  101  by the horizontal conveying roller  111  into the inner housing. Before the disk is placed in a fixed position in the small disk positioning recess  121  shown in FIG. 20, the disk abuts with the small disk abutting pin. As a result, the lever is rotated. 
     In this way, the center of a small disk which is inserted and conveyed into the inner housing or a large disk comes to the center of the turntable. As a result, as shown in FIG. 18, when the inserted disk is a large disk, the lever above is rotated by the inserted large disk in the manner described above and the clamping operation of the large disk is initiated. 
     The initiation of the clamping operation above is the same for a small disk  201 . 
     Next, the operation of inserting a small disk which is inserted off-center towards one end of a disk insertion mouth  101  will be explained. 
     (Disk Insertion Operation of a Small Disk which is Inserted Off-center Towards One End of a Disk Insertion Mouth  101 ) 
     As shown in FIG. 21, when a small disk  201  is inserted off-center towards one end of a disk insertion mouth  101 , the inserted small disk  201 , rides on one of the pairs of tapered faces  102   a,    103   a  of the first and second disk selection projections  102 ,  103  shown in FIG.  14 . The leading edge slopes downwardly in the direction of insertion as shown in FIG. 22 between one of the pairs of tapered faces  102   a,    103   a  and the conveying roller  111 . 
     FIG. 23 is a diagram of the disk selection mechanism of FIG. 22 seen from below. The disk is conveyed further into the inner housing as shown in FIG. 24 in this state by one pair of said tapered faces  102   a,    103   a  and the conveying roller  111 . 
     Since the conveying roller  111  is formed in a trapezoid shape in which the outer periphery increases towards both ends from the center as shown in FIG. 23, the outer edge of the small disk  201  is conveyed being gripped between one pair of the tapered faces  102   a,    103   a  and the conveying roller  111 . Thus, a part of the peripheral edge of the small disk  201  is gripped between the outer face of the conveying roller  111  formed in a trapezoid shape and one pair of said tapered faces  102   a,    103   a.  Furthermore the peripheral edge of the small disk  201  is conveyed into the inner housing along one of the tapered faces  102   a,    103   a  and the outer face of the conveying roller  111 . Thus, the disk comes into the state as shown in FIGS. 24,  25  and  26 . As can be seen from the figures, the small disk  201  is in an approximately horizontal position from the position shown in FIG.  22 . The peripheral face of the small disk  201  abuts with the step  121   a  of the recess  121  for positioning the small disk. Thereafter, since the small disk  201  is conveyed while being gripped by the conveying roller  111  formed in a trapezoid shape and one pair of the tapered faces  102   a,    103   a,  a force acts on the small disk  201  towards the center of the conveying roller  111 . The small disk  201  is conveyed to the inner housing along the step  121   a  of the small disk positioning recess  121  with the direction of displacement changed in the direction of the center (the direction Y shown in FIG. 25) of the conveying roller  111 . As a result, the small disk  201 , the peripheral face of which has abutted with the step  121   a  of the small disk positioning recess  121 , is fixed in a position in the small disk positioning recess  121  along the step  121   a.    
     When the small disk  201  is fixed in the above fixed position, the peripheral face of the small disk  201  does not abut with the tapered faces  102   a,    103   a  of the first and second disk selection projections  102 ,  103 . 
     As shown above, according to a first embodiment, a disk device is adapted so that a peripheral face of a large disk on insertion avoids a small disk abutment pin and abuts with a large disk abutment pin. A peripheral face of a small disk on insertion avoids a large disk abutment pin and abuts with a small disk abutment pin. The respective disks are placed on a turntable and clamped. These operations are performed reliably without increases in the complexity of the device. 
     Furthermore, when a small disk is inserted in an off-center position towards one end of a disk insertion mouth  101 , the peripheral lateral face of the small disk abuts with the small disk abutting pin and is accurately placed in a fixed position. Thus, it is possible to clamp and hold a disk on a turntable. 
     As shown above, the disk device of the present invention is adapted for use as a disk device in an automobile since it allows for simple and highly reliable clamping of disks of differing sizes on a turntable.