Abstract:
The present invention comprises a controlling mechanism for selectively providing the driving force from the same driving source to a tray driving mechanism, a disk driving section driving mechanism and a head driving mechanism for successively moving a tray, a disk driving section and a head in this order or in the opposite order, and a switch driving mechanism for controlling the switch in either of the on and off states at the time the tray reaches at the pulling out reference position from the cabinet, and controlling the same in the other state of the on and off states at the time the head reaches at the reference position for recording or reproducing with respect to the disk according to the contract with the member interlocked with the operation of the controlling mechanism.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
         [0001]    This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2003-153079, filed May 29, 2003, the entire contents of which are incorporated herein by reference.  
         BACKGROUND OF THE INVENTION  
         [0002]    1. Field of the Invention  
           [0003]    The present invention relates to a disk loading device for inserting or taking out a tray for mounting an optical disk with respect to an apparatus main body, and a disk loading method. Moreover, the present invention relates to an optical disk apparatus using the above-mentioned disk loading device.  
           [0004]    2. Description of the Related Art  
           [0005]    As is well known, recently, the so-called multi disk drive appliance capable of not only recording or reproducing data for a CD (compact disk) but also recording or reproducing data for an optical disk such as a DVD (digital versatile disk) has been used widely.  
           [0006]    Since this kind of the multi disk drive appliance is used for example not only as an external appliance for a desk top type personal computer but also as an appliance stored in a lap top type personal computer, a small size and a thin shape is required as much as possible for the external size.  
           [0007]    According to a common optical disk device for recording or reproducing data for an optical disk, in the case a tray is pulled out from a housing, mounting an optical disk on the tray and storing the same in the housing, the optical disk is clamped between a turn table and a damper rotatably.  
           [0008]    Moreover, accompanied by this operation, an optical head is moved to the innermost circumferential portion of the optical disk. Then, by rotating and driving the optical disk in this state, and moving the optical head in the optical disk radial direction, data can be recorded or reproduced in the optical disk.  
           [0009]    In contrast, at the time of taking out the optical disk, first, the optical disk rotation is stopped for releasing the clamped state of the optical disk by the turn table and the clamper. Then, since the optical disk is placed on the tray in the housing, by pulling out the tray from the housing, the optical disk can be taken out.  
           [0010]    Here, the above-mentioned mechanism for mounting or taking out the optical disk with respect to the optical disk apparatus is called a disk loading device. Also for the disk loading device, nowadays, various configurations are considered for meeting the demand for a small size and a thin shape.  
           [0011]    Jpn. Pat. Appln. KOKAI Publication No. 10-112118 discloses a configuration of cutting back the number of switches by detecting the point of completing discharge of the tray and the point of completing clamping of the disk by one detection switch. However, according to Jpn. Pat. Appln. KOKAI Publication No. 10-112118, a two contact type switch is necessary as the switch, and the operation mechanism for the switch is bulky.  
           [0012]    Moreover, Jpn. Pat. Appln. KOKAI Publication No. 2000-149379 discloses a configuration of handling a reciprocal operation of moving a tray from a storage position to a taking out position, and furthermore, moving the same from the taking out position to the storage position as a series of operation so as to eliminate the need of detecting the tray taking out position, and a configuration of taking out a tray and clamping a disk by the same driving source.  
           [0013]    Furthermore, Jpn. Pat. Appln. KOKAI Publication No. 2001-325764 discloses a configuration of commonly using a driving source for a loading mechanism and a feeding mechanism and utilizing the inverse direction rotation of a spindle motor, which has not conventionally been used, for simplifying the configuration, reducing the cost, and achieving a light weight.  
           [0014]    Moreover, Jpn. Pat. Appln. KOKAI Publication No. 2000-311411 discloses a configuration of smoothly advancing a tray while restraining the increase of the power consumption by supplying a voltage or an electric current of a higher level at the time of advancing the tray from the home position to the extra position than at the time of withdrawing the tray from the extra position to the home position so as to increase the tray driving force.  
           [0015]    However, according to the techniques disclosed in Jpn. Pat. Appln. KOKAI Publication Nos. 2000-149379, 2001-325764 and 2000-311411, the above-mentioned strong demand for a small size and a thin shape to the disk loading device has not been satisfied sufficiently in terms of the practical use.  
         BRIEF SUMMARY OF THE INVENTION  
         [0016]    According to one aspect of the present invention, there is provided a disk loading device comprising: a tray driving mechanism configured to move a tray capable of placing a disk thereon between a position taken out from a cabinet and a position stored in the cabinet according to the driving force applied from the outside; a disk driving section driving mechanism configured to move a disk driving section to mount, rotate and drive the disk placed on the tray stored in the cabinet between a position for mounting the disk and a position for detaching the disk according to the driving force applied from the outside; a head driving mechanism which is moved together with the disk driving section by the disk driving section driving mechanism, and configured to move a head in the diameter direction of the disk mounted in the disk driving section according to the driving force applied from the outside; a controlling mechanism which is engaged selectively with the tray driving mechanism, the disk driving section driving mechanism, and the head driving mechanism, and configured to successively move the tray, the disk driving section and the head in this order or in the opposite order by selectively applying the driving force from the same driving source to each driving mechanism; and a switch driving mechanism configured to control the switch in either of the on and off states in a state with the tray reach at the pulling out reference position from the cabinet according to the contact or detachment of the member interlocked with the operation of the controlling mechanism, and to control the same in the other of the on and off states with the head reach at the reference position for recording or reproduction with respect to the disk.  
           [0017]    According to one aspect of the present invention, there is provided a disk loading method comprising: selectively providing the driving force from the same driving source to a tray driving mechanism, a disk driving section driving mechanism and a head driving mechanism for moving a tray, a disk driving section and a head successively in this order or in the opposite order; and selectively controlling the same switch in the on and off states between a state with the tray reach at the pulling out reference position from a cabinet and a state with the head reach at the reference position for recording or reproduction with respect to a disk in a disk loading device comprising the tray driving mechanism configured to move the tray capable of placing the disk thereon between a position taken out from the cabinet and a position stored in the cabinet according to the driving force applied from the outside; the disk driving section driving mechanism configured to move the disk driving section to mount, rotate and drive the disk placed on the tray stored in the cabinet between a position for mounting the disk and a position for detaching the disk according to the driving force applied from the outside; and the head driving mechanism which is to be moved together with the disk driving section by the disk driving section driving mechanism, and configured to move the head in the diameter direction of the disk mounted in the disk driving section according to the driving force applied from the outside.  
           [0018]    According to one aspect of the present invention, there is provided a optical disk apparatus comprising: a tray driving mechanism configured to move a tray capable of placing a disk thereon between a position taken out from a cabinet and a position stored in the cabinet according to the driving force applied from the outside; a disk driving section driving mechanism configured to move a disk driving section to mount, rotate and drive the disk placed on the tray stored in the cabinet between a position for mounting the disk and a position for detaching the disk according to the driving force applied from the outside; a head driving mechanism which is to be moved together with the disk driving section by the disk driving section driving mechanism, and configured to move a head in the diameter direction of the disk mounted in the disk driving section according to the driving force applied from the outside; a controlling mechanism which is to be engaged selectively with the tray driving mechanism, the disk driving section driving mechanism, and the head driving mechanism, and configured to successively move the tray, the disk driving section and the head in this order or in the opposite order by selectively applying the driving force from the same driving source to each driving mechanism; and a switch driving mechanism configured to control the switch in either of the on and off states in a state with the tray reach at the pulling out reference position from the cabinet according to the contact or detachment of the member interlocked with the operation of the controlling mechanism, and to control the same in the other of the on and off states with the head reach at the reference position for recording or reproduction with respect to the disk; wherein a recording or reproducing operation is executed with respect to the disk in a state with the switch controlled in the other state of the on and off states by the arrival of the head to the reference position for executing the recording or reproducing operation with respect to the disk by the switch driving mechanism. 
       
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING  
       [0019]    [0019]FIG. 1 is an external view of an embodiment of the present invention for explaining an optical disk apparatus.  
         [0020]    [0020]FIG. 2 is a diagram for explaining the state of a disk loading section of the same optical disk apparatus viewed from the upper surface side.  
         [0021]    [0021]FIG. 3 is a diagram for explaining the state of a disk loading section of the same optical disk apparatus viewed from the rear surface side.  
         [0022]    [0022]FIG. 4 is a diagram for explaining the state with a tray stored inside a base member of the same disk loading section.  
         [0023]    [0023]FIG. 5 is a diagram for explaining the state with the tray taken out from the base member in the same disk loading section.  
         [0024]    [0024]FIG. 6 is a diagram for explaining the state of a chassis of the same disk loading section viewed from the upper surface side.  
         [0025]    [0025]FIGS. 7A to  7 C are diagrams for explaining the details of a slide cam in the same disk loading section.  
         [0026]    [0026]FIG. 8 is a diagram for explaining the state of an optical head and a rack member of the same disk loading section viewed from the upper surface side.  
         [0027]    [0027]FIG. 9 is a diagram for explaining the state of the optical head and the rack member of the same disk loading section viewed from the rear surface side.  
         [0028]    [0028]FIG. 10 is a diagram for explaining the relationship between the rack member and a driving member for operating a detection switch in the same disk loading section.  
         [0029]    [0029]FIG. 11 is a diagram for explaining the relationship between the rack member, the driving member, and the slide cam in the same disk loading section.  
         [0030]    [0030]FIGS. 12A and 12B are diagrams for explaining the details of a gear in the same disk loading section.  
         [0031]    [0031]FIG. 13 is a diagram for explaining the detailed operation of the main part in the same disk loading section.  
         [0032]    [0032]FIG. 14 is a diagram for explaining the detailed operation of the main part in the same disk loading section.  
         [0033]    [0033]FIG. 15 is a diagram for explaining the detailed operation of the main part in the same disk loading section.  
         [0034]    [0034]FIG. 16 is a diagram for explaining the detailed operation of the main part in the same disk loading section.  
         [0035]    [0035]FIG. 17 is a diagram for explaining the detailed operation of the tray in the same disk loading section.  
         [0036]    [0036]FIG. 18 is a diagram for explaining the detailed operation of the tray in the same disk loading section.  
         [0037]    [0037]FIG. 19 is a diagram for explaining the detailed operation of the tray in the same disk loading section.  
         [0038]    [0038]FIG. 20 is a diagram for explaining the detailed operation of the tray in the same disk loading section.  
         [0039]    [0039]FIG. 21 is a diagram for explaining the operation timing of the detection switch, the tray, the chassis and the optical head in the same disk loading section.  
         [0040]    [0040]FIG. 22 is a flow chart for explaining the tray storing operation in the same disk loading section.  
         [0041]    [0041]FIG. 23 is a flow chart for explaining the tray taking out operation in the same disk loading section. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0042]    Hereinafter, an embodiment of the present invention will be explained in detail with reference to the drawings. FIG. 1 shows the external appearance of an optical disk apparatus  11  to be explained in this embodiment. That is, the optical disk apparatus  11  has a cabinet  12  formed in a substantially thin box-like shape.  
         [0043]    A disk loading section  14  is placed in the central portion of a front panel  13  of the cabinet  12 . According to the disk loading section  14 , by taking out or inserting a tray to be described later outward from the front panel  13  of the cabinet  12 , for example, an optical disk such as a CD and a DVD can be mounted or discharged.  
         [0044]    Moreover, a power source key  15  is provided on one end portion of the front panel  13  of the above-mentioned cabinet  12 . Furthermore, a display  16  for displaying the operation state and a plurality of operation keys  17  for setting the optical disk apparatus  11  in a predetermined operation state or stopped state are provided on the other end portion of the front panel  13 .  
         [0045]    [0045]FIG. 2 shows the state of the above-mentioned disk loading section  14  taken out and viewed from the upper surface side. That is, a base member  18  serves as a mounting base member for supporting various part directly or indirectly.  
         [0046]    The base member  18  includes a top plate  18   a , side plates  18   b ,  18   b  formed on the both ends facing with each other of the top plate  18   a , a bottom plate  18   c  (not shown in FIG. 2), elongating from the side plate  18   b ,  18   b  so as to face the top plate  18   a  by its surface, and a front plate  18   d  (not shown in FIG. 2) formed with a gap for freely inserting a tray  22  to be described later provided with respect to the top plate  18   a , for interlocking the front end portions of the side plates  18   b ,  18   b  with each other.  
         [0047]    Among them, an interlocking plate  19  is placed over between the side plates  18   b ,  18   b . A clamp member  21  is mounted on the central portion of the inter-locking plate  19  via an elastic mounting piece  20 . The clamp member  21  is forced by the mounting piece  20  via an opening  21   a  formed in the top plate  18   a  of the base member  18  toward the inward of the base member  18 .  
         [0048]    Moreover, the tray  22  is supported on the base member  18 . The tray  22  is supported slidably in the right and left direction in the figure in a state with a disk placing section  22   a  thereof facing the top plate  18   a  by its surface. In this case, the tray  22  has the both side surfaces supported slidably by a boss provided in the bottom plate  18   c  of the base member  18 .  
         [0049]    [0049]FIG. 3 shows the state of the above-mentioned disk loading section  14  viewed from the rear surface side. That is, the a chassis  23  is supported by the bottom plate  18   c  of the base member  18  so as to face the rear surface of the tray  22  by its surface. On the chassis  23 , a turn table, an optical head, or the like to be described later are mounted.  
         [0050]    Moreover, projections  23   a ,  23   a  formed on one end portion of the chassis  23  are supported by the bottom plate  18   c  rotatably. Thereby, the chassis  23  has the other end portion thereof supported with the projections  23   a ,  23   a  as the fulcrum movably in the swinging direction.  
         [0051]    In this case, a boss  23   b  is provided projecting from the center of the other end portion of the chassis  23 . The boss  23   b  is engaged with a slide cam  48  to be described later including an elevating mechanism, supported slidably in the vertical direction in the figure along the front plate  18   d  of the base member  18 . Then, according to the control of the boss  23   b , following the slide cam  48 , the chassis  23  is controlled so as to elevate a turn table, an optical head, of the like with respect to the tray  22 .  
         [0052]    Moreover, a driving motor  24  is supported by the chassis  23 . A worm gear  25  is fitted with the rotation axis of the driving motor  24 . According to the engagement of the worm gear  25  with the worm wheel  24  supported rotatably on the chassis  23 , the rotation force of the driving motor  24  is transmitted to the worm wheel  26 .  
         [0053]    According to the rotation of the worm wheel  26  by the rotation force of the driving motor  24 , the tray  22 , the chassis  23 , the optical head, or the like are moved as it will be described later.  
         [0054]    Moreover, a detection switch to be described later is provided to the above-mentioned chassis  23  for detecting the pulling out reference position of the tray  22 , the reference position for starting recording or reproduction of the optical head, or the like. Furthermore, a driving member  27  for operating the detection switch is provided rotatably by a shaft  28  on the chassis  23 . The driving member  27  is forced rotatably in the counterclockwise direction in the figure by a coil spring  29 .  
         [0055]    [0055]FIG. 4 shows the state of the tray  22  stored inside the base member  18 , viewed from the side surface. In this case, the chassis  23  is controlled at a position raised with respect to the tray  22 . At this position, the turn table lifts up the optical disk from the tray  22  and clamps the optical disk with respect to the clamp member  21 , and the optical head faces the signal recording surface of the optical disk.  
         [0056]    [0056]FIG. 5 shows the state with the tray  22  pulled out from the base member  18 , viewed from the side surface. In this case, the chassis  23  is controlled at a position lowered with respect to the tray  22 . At this position, the turn table is away from the optical disk, and the optical disk is placed on the tray  22 .  
         [0057]    [0057]FIG. 6 shows the state of the above-mentioned chassis  23 , viewed from the FIG. 2 direction. The above-mentioned turn table  30  is fitted on the rotation axis of a disk motor (not shown) fixed on the chassis  23  so as to be rotated and driven by the rotation force of the disk motor.  
         [0058]    Moreover, the above-mentioned optical head  31  is mounted on the chassis  23 . The optical head  31  includes a head portion  32  having an unillustrated laser diode, a photo diode, or the like, a printed circuit board  33  to have the head portion  32  mounted, and a holder  34  with the printed circuit board  33  fixed.  
         [0059]    Then, the optical head  31  is supported movably by two guide shafts  35 ,  36  fixed parallel to the chassis  23  in the direction approaching to the turn table  30 , and in the direction moving away from the turn table  30 .  
         [0060]    In this case, in the above-mentioned holder  34 , a supporting member  37  to be engaged slidably with the guide shaft  35 , and a supporting member  38  to be engaged slidably with the guide shaft  36  are formed, respectively. Then, the optical head  31  is supported slidably by the supporting members  37 ,  38  on the guide shafts  35 ,  36 .  
         [0061]    Then, the guide shaft  35  is supported by the both end portions by the supporting members  39 ,  40  on the chassis  23 . Moreover, the guide shaft  36  is supported by both end portions by the supporting members  41 ,  42  on the chassis  23 .  
         [0062]    An adjusting mechanism for adjusting the interval between the guide shafts  35 ,  36  and the chassis  23  is provided for, for example, three ( 39 ,  40 ,  42 ) out of the four supporting members  39 ,  40 ,  41 ,  42  such that the tilt adjustment can be executed for the optical head  31  according to the adjustment.  
         [0063]    Moreover, a rack member  43  formed so as to surround the supporting member  38  to be engaged with the guide shaft  36  is fixed on the above-mentioned holder  34 . Then, a rack  44  is formed on the rack member  43  on the opposite side with respect to the side facing the optical head  31 . The rack  44  can be engaged with a pinion gear  45  formed concentrically with the above-mentioned worm wheel  26 .  
         [0064]    Thereby, in the case the driving motor  24  is rotated and the rotation force is transmitted to the rack  44 , the optical head  31  is moved along the guide shafts  35 ,  36  in the direction according to the rotation direction of the driving motor  24 .  
         [0065]    A connector  46  is provided to the printed circuit board  33  with the above-mentioned head portion  32  mounted. By connecting a cable  47  with the connector  46 , a signal can be exchanged with respect to the head portion  32 .  
         [0066]    Here, a cam driving section  49  for driving the above-mentioned slide cam  48  is formed on the above-mentioned rack member  43 . The slide cam  48  is supported slidably in the vertical direction in the figure along the front plate  18   d  of the base member  18  as mentioned above so as to be engaged with the boss  23   b  of the chassis  23 .  
         [0067]    [0067]FIGS. 7A to  7 C each show the details of the slide cam  48 . A cam hole  48   a  to be pierced through by the boss  23   b  of the chassis  23  is formed in the slide cam  48 .  
         [0068]    Moreover, in the slide cam  48 , a groove  48   d  having a cam surface  48   b  to be driven by the cam driving section  49  of the above-mentioned rack member  43 , and in contrast, a cam surface  48   c  for driving the cam driving section  49 , is formed.  
         [0069]    Furthermore, in the slide cam  48 , a rack  48   e , a groove  48   f  for inserting a projection portion to be described later of the above-mentioned driving member  27  in a state with the tray  22  completely pulled out from the base member  18 , and a groove  48   g  for inserting the projection portion to be described later of the above-mentioned driving member  27  in a state with the optical head  31  disposed at the innermost circumference of the optical disk, are formed.  
         [0070]    Moreover, in the slide cam  48 , a tray driving section  50  to be engaged with a cam projection portion to be described later formed in the tray  22 . The tray driving section  50  includes a projection portion  50   a  and a pin  50   b  formed with a predetermined interval provided therebetween.  
         [0071]    [0071]FIGS. 8 and 9 show the above-mentioned optical head  31  and rack member  43  in a state taken out. FIG. 8 shows the state viewed from the FIG. 2 direction, and FIG. 9 shows the state viewed form the rear side thereof.  
         [0072]    That is, the rack member  43  includes a rack supporting section  43   a  fixed on the above-mentioned holder  34 , and a rack piece  43   b  with the above-mentioned rack  44  formed, superimposed with each other. The rack piece  43   b  is supported by the rack supporting section  43   a  slightly movably along the superimposed surface with respect to the rack supporting section  43   a.    
         [0073]    Then, the rack piece  43   b  is forced by the coil spring  43   c  engaged with respect to the rack supporting section  43   a  such that the rack  44  is engaged with the above-mentioned pinion gear  45 . Thereby, the backlash between the rack  44  and the pinion gear  45  can be restrained.  
         [0074]    In the rack piece  43   b , a cam portion  43   d  for controlling the above-mentioned driving member  27  is formed.  
         [0075]    [0075]FIG. 10 shows the relationship between the above-mentioned rack member  43  and the driving member  27  for operating the above-mentioned detection switch. FIG. 10 shows the state with the optical head  31  disposed at a position on the outer circumference side with respect to the innermost circumference of the optical disk.  
         [0076]    In this case, since the cam portion  43   d  of the rack piece  43   b  is not engaged with the pin  27   a , and the projection portion  27   b  is inserted in the groove  48   g  of the above-mentioned slide cam  48 , the driving member  27  is at a position rotated maximally in the counter-clockwise direction so that it presses and operates the detection switch  51  fixed on the chassis  23  into the on state at the position.  
         [0077]    In the case the optical head  31  is moved to the optical disk innermost circumference position in this state, as shown in FIG. 11, the cam portion  43   d  of the rack piece  43   b  is engaged with the pin  27   a  of the driving member  27  so that the driving member  27  is rotated in the clockwise direction. Thereby, the pressing operation of the detection switch  51  is released so as to be in the off state so that the arrival of the optical head  31  to the optical disk innermost circumference position can be detected.  
         [0078]    In this case, although the cam driving section  49  of the rack member  43  is inserted into the groove  48   d  of the slide cam  48 , the cam driving section  49  is not contacted with the cam surface  48   b  of the slide cam  48  in this state so that the slide cam  48  cannot be slid.  
         [0079]    Here, a gear  52  having a large diameter is formed integrally with the above-mentioned pinion gear  45  concentrically. The pinion gear  45  and the gear  52  are formed independently from the above-mentioned worm wheel  26 , and they are interlocked with the worm wheel  26  via a clutch mechanism capable of transmitting the rotation force.  
         [0080]    Moreover, the gear  52  is engaged with a gear  53  supported rotatably by the chassis  23 . The worm wheel  26 , the pinion gear  45 , and the gears  52 ,  53  are all supported by the chassis  23  so as to be raised together according to elevation of the chassis  23 .  
         [0081]    In contrast, a gear  54  engageable with the gear  53  is supported rotatably on the above-mentioned base member  18 . As shown in FIGS. 12A and 12B, the gear  54  is a gear disposed in the middle portion of a complex gear formed integrally in the three stages in the axis direction. Gears are not provided in the gear  54  on the entire circumference, but they are lacked partially.  
         [0082]    A gear  55  having a large diameter is formed on the one end portion in the axis direction of the gear  54 , and a gear  56  having the same diameter is formed on the other end. The gear  55  is engaged with a gear to be described later for driving the above-mentioned tray  22 . The gear  54  can be engaged with the rack  48   e  of the above-mentioned slide cam  48 , and it cannot be engaged with the gear  53  in a state with the chassis  23  at the raised position. A gear  56  is engaged with the gear  53  in a state with the chassis  23  at the lowered position.  
         [0083]    Here, as shown in FIG. 10 above, in a state with the optical head  31  transported by the driving motor  24  at a position on the outer circumference side with respect to the innermost circumference of the optical disk, although the gears  52 ,  53  can be rotated, the gear  54  is not rotated since the gear lacking portion thereof faces the gear  53 .  
         [0084]    Thereafter, as shown in FIG. 11, in the case the optical head  31  is further rotated by the driving motor  24  in the direction toward the turn table  30  in a state with the optical head  31  reached at the innermost circumference position of the optical disk, the optical head  31  is not moved and only the rack piece  43   b  is moved, resisting to the pressuring force of the coil spring  43   c.    
         [0085]    Then, the cam driving section  49  at the top end of the rack piece  43   b  pressures the cam surface  48   b  of the slide cam  48  so as to slide the slide cam  48  in the left direction in FIG. 11. At the time, as shown in FIG. 13, the rack  48   e  of the slide cam  48  rotates the gear  54 , and thereby, the gear  54  is engaged with the gear  53 .  
         [0086]    Therefore, the slide cam  48  is moved further in the left direction in FIG. 13 according to the rotation force of the driving motor  24 . In the state of FIG. 13, since the driving member  27  has the pin  27   a  pressed by the cam portion  43   d  of the rack piece  43   b  and it is in a state rotated in the clockwise direction, the detection switch  51  is maintained in the off state.  
         [0087]    Thereafter, in the case the slide cam  48  is slid continuously in the left direction, as shown in FIG. 14, the cam driving section  49  of the rack piece  43   b  is driven by the cam surface  48   c  of the slide cam  48  so that the cam driving section  49  moves across the slide cam  48  in the thickness direction so as to be engaged on the rear surface thereof.  
         [0088]    At the time, the rack  44  of the rack piece  43   b  is detached from the pinion gear  45  so that the rack piece  43   b  cannot be moved. Moreover, at the time, the chassis  23  has the boss  23   b  received the force in the lowering direction by the cam hole  48   a  of the slide cam  48  according to slide of the slide cam  48  so as to be lowered.  
         [0089]    Then, according to lowering of the chassis  23 , the gear to be engaged with the gear  53  is switched from the gear  54  to the gear  56 , however, since the gear  54  and the gear  56  are provided concentrically, the rotation of the gear  54  is continued.  
         [0090]    Although the pin  27   a  of the driving member  27  is detached from the cam portion  43   d  of the rack piece  43   b  in the state of FIG. 14, since the driving member  27  has the projection portion  27   b  engaged with the wall surface of the slide cam  48  so as to be in the state rotated in the clockwise direction, the detection switch  51  is maintained in the off state.  
         [0091]    Thereafter, as shown in FIG. 15, in the case the tray  22  starts movement in the pulling out direction according to lowering of the chassis  23 , the slide cam  48  is slid in the left direction by the function of the cam projection portion to be described later of the tray  22 , and thereby, the rack  48   e  is completely detached from the gear  56  so as not to be driven by the driving motor  24 .  
         [0092]    Then, at the time the tray  22  reaches at the position for completing the pulling out operation thereof, the slide cam  48  is moved further in the left direction according to the function of the cam projection portion of the tray  22 . At the time, as shown in FIG. 16, the driving member  27  has the projection portion  27   b  thereof inserted in the groove  48   f  of the slide cam  48  so as to be rotated in the counterclockwise direction. Thereby, the detection switch  51  is operated in the on state so that the arrival of the tray  22  at the pulling out position can be detected.  
         [0093]    Next, the operation of the tray  22  will be explained. FIG. 17 shows the slide cam  48  and the rack piece  43   b  in the state of FIG. 11. The rack  57  is formed on one side surface of the tray  22 , and the gear  58  engageable with the rack  57  is supported by the base member  18  rotatably. The gear  58  is always engaged with the above-mentioned gear  55 . Moreover, since the gear  54  is not engaged with the gear  53  in this state, the gears  55 ,  58  are not rotated.  
         [0094]    Here, a cam projection portion  59  is formed in the tray  22 . The cam projection portion  59  includes a portion  59   a  elongating in the tray  22  width direction, a first cam portion  59   b , a portion  59   c  elongating in the tray  22  sliding direction, and a second cam portion  59   d  formed continuously. The cam projection portion  59  is provided so as to be interposed between the projection portion  50   a  of the above-mentioned slide cam  48  and the pin  50   b.    
         [0095]    As it is explained with reference to FIG. 11, in the case the sliding operation of the slide cam  48  is started by pressing the cam surface  48   b  of the slide cam  48  by the cam driving section  49  of the rack piece  43   b , as shown in FIG. 18, the projection portion  50   a  of the slide cam  48  presses the first cam portion  59   b  so that the tray  22  is slide in the direction to be pulled out from the base member  18 .  
         [0096]    Thereby, the rack  57  of the tray  22  is engaged with the gear  58 . At the time, the gear  53  is engaged with the gear  56  so that the tray  22  is pulled out from the base member  18  according to the rotation force of the driving motor  24 . In the case the driving motor  24  is further rotated, it is in the state shown in FIG. 19. At the time, the projection portion  50   a  of the slide cam  48  and the pin  50   b  are at a position so as to interpose the portion  59   c  of the cam projection portion  59  therebetween.  
         [0097]    Accordingly, in the case the tray  22  is pulled out from the base member  18  mostly, it is in the state shown in FIG. 20. This state is same as the state shown in FIG. 16. FIG. 20 shows the state with the pin  50   b  of the slide cam  48  contacted with the second cam portion  59   d  according to the movement of the tray  22  so that the slide cam  48  is slide further in the left direction.  
         [0098]    According to the slide cam  48  sliding operation by the second cam portion  59   d , as shown in FIG. 16, the projection portion  27   b  of the driving member  27  is inserted in the groove  48   f  of the slide cam  48  so that the detection switch  51  is in the on state for detecting that the tray  22  is completely pulled out from the base member  18 .  
         [0099]    The drive of the optical head  31 , the drive of the chassis  23 , and the drive of the tray  22  as described above are executed continuously according to the rotation of the driving motor  24  in one direction. Moreover, by rotating and driving the driving motor  24  in the opposite direction from the state shown in FIGS. 16 and 20, storage of the tray  22  in the base member  18 , elevation of the chassis  23 , and drive of the optical head  31  in the optical disk diameter direction can be executed.  
         [0100]    Moreover, in the case the tray  22  is driven from the pulled out state into the direction to be stored in the base member  18 , the projection portion  50   a  of the slide cam  48  is pressed by the second cam portion  59   d  so that the slide cam  48  is slid in the right direction in FIG. 20. Therefore, since the projection portion  27   b  of the driving member  27  is rotated in the clockwise direction so as to be detached from the groove  48   f  of the slide cam  48  and engaged with the wall surface of the slide cam  48 , the detection switch  51  is switched into the off state.  
         [0101]    Thereafter, in the case the tray  22  is stored in the base member  18  to the position shown in FIG. 18, since the projection portion  50   a  of the slide cam  48  is contacted with the first cam portion  59   b  of the tray  22 , the rack  48   e  of the slide cam  48  and the gear  54  are engaged, interlocked with the tray  22  storing operation to the base member  18  so that the slide cam  48  is slid further in the right direction according to the rotation force of the driving motor  24 .  
         [0102]    Thereby, since the tray  22  is moved further in the direction to be stored in the base member  18  according to the first cam portion  59   b  pressing operation by the pin  50   b  of the slide cam  48 , as shown in FIG. 17, the rack  57  of the tray  22  is detached from the gear  58  so that the tray  22  is stopped.  
         [0103]    According to the slide cam  48  sliding operation in the right direction in the figure, the chassis  23  is raised so that the gear to be engaged with the gear  53  is switched from the gear  56  to the gear  54 . Moreover, although the pinion gear  45  and the rack  44  are not engaged in FIG. 14, according to the slide cam  48  sliding operation in the right direction, as shown in FIG. 13, the cam driving section  49  of the rack piece  43   b  is pushed by the cam surface  48   b  of the slide cam  48  so that the rack piece  43   b  is moved upward in the figure and the rack  44  is engaged with the pinion gear  45 .  
         [0104]    Furthermore, according to the rotation of the pinion gear  45  by the rotation of the driving motor  24 , the slide cam  48  is driven and slid by the cam driving section  49  from the state shown in FIG. 13 to the state shown in FIG. 11, and thereby, the gear  54  is rotated to a position not to be engaged with the gear  53 .  
         [0105]    The projection portion  27   b  of the driving member  27  is contacted with the wall surface of the slide cam  48  from the state shown in FIG. 14 to  13 , and the pin  27   a  of the driving member  27  is contacted with the cam portion  43   d  of the rack piece  43   b  in the state shown in FIG. 13 so that the detection switch  51  is maintained in the off state.  
         [0106]    Moreover, according to the movement from FIG. 13 to FIG. 11, the projection portion  27   b  of the driving member  27  is at a position corresponding to the groove  48   g  of the slide cam  48 . Since the pin  27   a  is contacted with the cam portion  43   d , the detection switch  51  is maintained in the off state.  
         [0107]    Thereafter, according to the movement of the optical head  31  from the position shown in FIG. 11 in the direction shown in FIG. 10, the pin  27   a  of the driving member  27  is detached from the cam portion  43   d  of the rack piece  43   b , and the projection portion  27   b  enters into the groove  48   g  of the slide cam  48  so that the driving member  27  is rotated in the counterclockwise direction for switching the detection switch  51  into the on state.  
         [0108]    [0108]FIG. 21 shows the operation timing of the detection switch  51 , the tray  22 , the chassis  23  and the optical head  31  as the state transition of the disk loading section  14  in a series of operation of storing the tray  22  in the pulled out state into the base member  18  and moving the optical head.  
         [0109]    That is, in the state with the tray  22  pulled out, the detection switch  51  is in the on state, the tray  22  is at the completely pulled out position, the chassis  23  is at the lowered position, and the optical head  31  is controlled to the innermost circumference position.  
         [0110]    In the case the driving motor  24  is rotated and driven to the position for storing the tray  22  into the base member  18  in this state, the tray  22  is moved to the storage position into the base member  18 . Accompanied thereby, the slide cam  48  is moved from the position shown in FIG. 16 to FIG. 15 so that the detection switch  51  is switched from the on state to the off state.  
         [0111]    In the case the tray  22  is stored in the base member  18  accordingly, the chassis  23  is raised for executing disk clamping of clamping the optical disk between the turn table  30  and the clamping member  21 .  
         [0112]    Then, at the time the disk clamping operation is completed, the optical head  31  is moved from the innermost circumference position to the outer circumference direction of the optical disk. At the time the optical head  31  reaches at a predetermined position, the detection switch  51  is switched from the off state to the on state. The switching operation of the detection switch  51  from the off state to the on state at the time corresponds to the arrival of the optical head  31  to the reference position for recording or reproduction with respect to the optical disk.  
         [0113]    Moreover, in the case the driving motor  24  is rotated and driven in the direction for pulling out the tray  22  from the base member  18  in a state with the optical head  31  facing the optical disk, the optical head  31  is moved to the innermost circumference direction of the optical disk. At the time the optical head  31  reaches at a predetermined position, the detection switch  51  is switched from the on state to the off state.  
         [0114]    Then, after moving the optical head  31  to the innermost position of the optical disk, the chassis  23  is lowered so that the turn table  30  is moved away from the optical disk, and the optical disk is placed on the disk placing section  22   a  of the tray  22 .  
         [0115]    Thereafter, at the time the tray  22  is pulled out from the base member  18  and reaches at a predetermined pulling out position, the detection switch  51  is switched from the off state to the on state. The switching operation of the detection switch  51  from the off state to the on state corresponds to the arrival of the tray  22  to the predetermined pulling out completing position for mounting or taking out the optical disk.  
         [0116]    [0116]FIG. 22 is a flow chart of a series of the operation of moving the tray  22  from the pulling out position to the storage position. First, this operation is started in a state with the tray  22  pulled out (step S 1 ).  
         [0117]    Then, in the case the detection switch  51  is switched from the on state to the off state, or a close key (not shown) is operated in step S 2 , the driving motor  24  is rotated and driven in the direction for storing the tray  22  into the base member  18  in step S 3 .  
         [0118]    Thereafter, in the case the detection switch  51  is switched from the off state to the on state in step S 4 , the driving motor  24  is braked in step S 5 , and the optical head  31  is moved in step S 6  so as to finish the operation (step S 7 ).  
         [0119]    [0119]FIG. 23 is a flow chart of a series of the operation of moving the tray  22  from the storage position to the pulling out position. First, this operation is started in a state with the tray  22  stored in the base member  18  (step S 8 ).  
         [0120]    Then, in the case an open key (not shown) is operated in step S 9 , the driving motor  24  is rotated and driven in the direction for pulling out the tray  22  from the base member  18  in step S 10 .  
         [0121]    Thereafter, in the case the detection switch  51  is switched from the off state to the on state in step S 11 , the driving motor  24  is braked in step S 12  so as to finish the operation (step S 13 ).  
         [0122]    According to the above-mentioned embodiment, since the arrival of the tray  22  to the predetermined pulling out completing position for mounting or taking out the optical disk, and the arrival of the optical head  31  to the reference position for recording or reproduction with respect to the optical disk can be detected by one detection switch  51  without the need of a special specification, a small size and a thin shape can be promoted in a simple configuration, and furthermore, it can be provided sufficiently for the practical use.  
         [0123]    The present invention is not limited to the above-mentioned embodiment, and it can be embodied with various modification of the constituent elements within a range of the gist thereof in the practical stage. Moreover, various inventions can be formed by optionally combining a plurality of the constituent elements disclosed in the above-mentioned embodiment. For example, several constituent elements may be omitted form the entire constituent components shown in the embodiment. Furthermore, the constituent components in the different embodiments can be used optionally in a combination.