Disk cartridge loading mechanism for use in disk recording and/or reproducing device

Abstract: The cartridge loading mechanism comprises a cartridge holder (4) having one end rotatably supported to a chassis (2) for loading and unloading a cartridge (42), and a holder drive mechanism (5) for moving a fulcrum (3) of the cartridge holder away from the chassis in accordance with rotation of the cartridge holder in the unloading direction, and moving the fulcrum of the cartridge holder near to the chassis in accordance with rotation of the cartridge holder in the loading direction.

Description: BACKGROUND OF THE INVENTION The present invention relates to a disk cartridge loading mechanism for use in a disk recording and/or regenerating device and, more particularly, to a disk cartridge loading mechanism provided with a holder for holding a disk cartridge as a recording medium. Referring to Fig. 1, a known cartridge loading mechanism includes a chassis 201 on which a spindle motor (not shown), etc. are mounted, and a holder 203 having one end rotatably supported thereon by support shafts 202. As to the known disk cartridge loading mechanism, when making the holder 203 inclined at a predetermined elevation angle or so-called open angle so that a cartridge take-off opening 204 provided at another end of the holder 203 is turned upward on the support shafts 202 as a fulcrum, the holder 203 is in the unloading state. If, in this state, a disk cartridge 205 as a medium is inserted into the holder 203 from the cartridge take-off opening 204, and the holder 203 is rotated downward to be in the loading state, a disk 206 of the disk cartridge 205 received in the holder 203 is chucked on the spindle motor to rotate therewith. As to the known disk cartridge loading mechanism, however, since the support shafts 202 of the holder 203 are supported to the chassis 201, and therefore, positional displacement of the support shaft 202 is not possible in the vertical direction, etc., there arise the following problems: 1) When the holder 203 is in the unloading or ejecting state, its open angle or inclination angle is larger, so that upon unloading, the spindle motor, head for record and regeneration of a disk, etc. can be seen from below the holder 203, becoming a unpreferred state in terms of appearance. 2) The open angle of the holder 203 is large, so that a dead space is enlarged, resulting in a difficulty of reducing the thickness of a main body of the mechanism. It is, therefore, an object of the present invention to solve the above prior art problems, and to provide a disk cartridge loading mechanism which is hard to see a spindle motor, head, etc. from below a holder even upon unloading of a holder by reducing an open angle upon unloading thereof, and easy to reduce a thickness. An example of a prior art cartridge loading mechanism corresponding to the preamble of claim 1 can be found in patent document DE-A-4 021 217. SUMMARY OF THE INVENTION According to the present invention, there is provided a cartridge loading mechanism for use in a disk recording and/or regenerating device for recording and/or regenerating signals on a disk received in a cartridge, comprising: a chassis; a holder arranged to hold the cartridge, said holder having one end rotatably supported to said chassis for allowing the holder to adopt an open position for loading and unloading the cartridge and a closed position for placing the holder in a loaded position, said holder having a fulcrum; and a supporting and guiding means for moving said fulcrum of said holder away from said chassis in accordance with a rotation of said holder in a direction of said open position, and moving said fulcrum of said holder near to said chassis in accordance with a rotation of said holder in a direction of said closed position; characterized in that said fulcrum of said holder is retained within an elongate opening formed in lugs which are unitary with said chassis and acts as a groove for said fulcrum. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a known disk cartridge loading mechanism; Fig. 2 is a view similar to Fig. 1, showing a disk cartridge loading mechanism embodying the present invention; Fig. 3 is a plan view showing the mechanism with a holder removed; Fig. 4 is a side view showing the holder in the unloading state; Fig. 5 is a view similar to Fig. 4, showing the holder in the loading state; Fig. 6 is a view similar to Fig. 2, showing a slider; Fig. 7 is a view similar to Fig. 3, showing the slider mounted on a chassis; Fig. 8 is a front view showing the holder not locked by a holder lock plate; Fig. 9 is a view similar to Fig. 8, showing the holder locked by the holder lock plate; Fig. 10 is a bottom view showing the mechanism; Fig. 11 is a view similar to Fig. 9, showing a head carriage; Fig. 12 is a view similar to Fig. 11, showing a lead screw; Fig. 13 is a view similar to Fig. 6, showing cartridge ejecting lever; Fig. 14 is a view similar to Fig. 7, showing the cartridge ejecting lever before being pressed by a disk cartridge; Fig. 15 is a view similar to Fig. 12, showing the cartridge ejecting lever before being pressed by the disk cartridge. Fig. 16 is a view similar to Fig. 14, showing the cartridge ejecting lever locked; Fig. 17 is a view similar to Fig. 15, showing the cartridge ejecting lever locked; Fig. 18 is a view similar to Fig. 16, showing the cartridge ejecting lever released by being pressed by a cover portion; and Fig. 19 is a view similar to Fig. 17, showing the cartridge ejecting lever released by being pressed by the cover portion. DETAILED DESCRIPTION OF THE INVENTION Referring to Fig. 2, a disk cartridge loading mechanism, designated generally by 1, includes a chassis 2, a holder 4 having one end rotatably and vertically movably mounted thereon by support shafts 3, and a holder drive mechanism 5 for rotating the holder 4 in the unloading direction and moving upward the support shafts 3, and rotating the holder 4 in the loading direction and moving downward the support shafts 3. Referring to Fig. 3, mounted on the chassis 2 are a spindle motor 21 for rotating a disk, a head 22 for reading and writing signals of the disk to be rotated by the spindle motor 21, a head carriage 23 for supporting the head 22, a guide shaft 24 for guiding the head carriage 23 so that the head 22 is urged to move in the radial direction of the disk, a lead screw 25 for moving the head carriage 23 along the guide shaft 24, and a stepping motor 26 for rotating the lead screw 25. Additionally, erectly arranged to the chassis 2 at its one end or inner end and on its right and left sides are a pair of bearing lugs 27, 27 which are formed with longitudinal bearing holes 28, 28. Next, the holder 4 will be described. As best seen in Fig. 2, the holder 4 includes a main body portion 43 having one end with a cartridge take-off opening 41 for receiving and holding a disk cartridge 42 as a medium to be inserted therein from the cartridge take-off opening 41, a cover portion 44 rotatably mounted to the main body portion 43, and a torsion coil spring 45 interposed between the main body portion 43 and the cover portion 44 for maintaining the two 43, 44 opened at a predetermined open angle. Additionally, arranged to the holder cover portion 44 at its one end opposite to the cartridge take-off opening 41 and on its right and left sides are the support shafts 3, 3 which are fitted in the longitudinal bearing holes 28, 28 of the bearing lugs 27, 27 so as to rotatably and vertically movably mount the support shafts 3, 3, i.e., the holder 4 on the chassis 2. In the state as shown in Fig. 4, if an upper face of the holder cover portion 44 is pressed downward after inserting the disk cartridge 42 in the holder main body portion 43 from the cartridge take-off opening 41, the support shafts 3, 3 of the holder 4 come down to lower ends of the bearing holes 28, 28 through the holder drive mechanism 5 which will be described in detail later, and the holder cover portion 44 lies on the holder main body portion 43 against force of the torsion coil spring 45, so that, as shown in Fig. 5, the cartridge take-off opening 41 of the holder main body portion 43 is closed by an end face plate 46 arranged to the holder cover portion 44 at its end. When the end face plate 46 of the holder cover portion 44 closes the cartridge take-off opening 41 of the holder main body portion 43, and the holder 4 comes to the loading position, pin engagement portions 49, 49 of a holder lock plate 48 arranged to the chassis 2 at its front face are engaged with lock pins 47, 47 arranged to the end face plate 46, thus holding the holder 4 in the loading position. Next, the holder drive mechanism 5 will be described. As best seen in Fig. 2, the holder drive mechanism 5 includes a slider 51 to be urged to slide along the chassis 2 for vertically moving the holder 4, and a pair of rotating levers 52, 52, each having one end pivotally supported to the slider 51 and another end pivotally supported to the holder 4 for rotating the holder 4 in the unloading direction when the slider 51 is urged to slide in the direction to move upward the holder 4, and in the loading direction when the slider 51 is urged to slide in the direction to move downward the holder 4. Referring to Figs. 6 and 7, the slider 51 is formed into an U-shape in terms of a plane by a pair of side plates 53, 54 and a connecting plate 55 for connecting one ends of the pair of side plates 53, 54, and it is slidably mounted on the chassis 2. Erectly arranged to the pair of side plates 53, 54 at their head are a pair of cam protrusions 56, 56 which are formed with inclined cam grooves 57, 57. Referring also to Figs. 4 and 5, the pair of cam protrusions 56, 56 are fitted between the pair of bearing lugs 27, 27 arranged to the chassis 2 and both side faces of the holder cover portion 44, respectively, whereas the support shafts 3, 3 arranged to the holder cover portion 44 on both its side faces are fitted in the inclined cam grooves 57, 57, respectively. Additionally, the slider 51 is fully biased in the unloading direction, i.e., in the direction of an arrow A in Fig. 6, by a coil spring 58 for slider operation, thus maintaining, as shown in Fig. 4, the support shafts 3, 3 biased to upper ends of the longitudinal bearing holes 28, 28 of the bearing lugs 27, 27 through the inclined cam grooves 57, 57. As best seen in Figs. 4 and 6, the pair of rotating levers 52, 52 have one end pivotally supported to the slider 51 through first shafts 61, 61, and another ends pivotally supported to the side faces of the holder cover portion 44 through second shafts 62, 62. When the slider 51 is biased in the unloading direction by force of the coil spring 58 for slider operation, the pair of rotating levers 52, 52 stand erect at a predetermined inclination angle  to maintain the holder 4 in the unloading state. If the upper face of the holder cover portion 44 is pressed to put the holder 4 in the loading state, the rotating levers 52, 52 come down in the horizontal direction to reduce the inclination angle , sliding the slider 51 in the loading direction, i.e., in the direction of an arrow B in Fig. 4, by the first shafts 61, 61, thus maintaining, as shown in Fig. 5, the support shafts 3, 3 biased to lower ends of the longitudinal bearing holes 28, 28 of the bearing lugs 27, 27 through the inclined cam grooves 57, 57 of the cam protrusions 56, 56. Referring to Fig. 7, a damper 59 is connected to the one 54 of the pair of side plates 53, 54 of the slider 51 at its head for adjusting a slide speed thereof. Next, the holder lock plate 48 will be described. As best seen in Figs. 8 and 9, the holder lock plate 48 is slidably mounted to a front face 2a of the chassis 2 by guide pins 71, 71 and long holes 72, 72. A coil spring 73 for plate operation provides slide force to the pin engagement portions 49, 49 of the holder lock plate 48 in the direction to engage with the lock pins 47, 47 arranged to the end face plate 46 of the holder cover portion 44, i.e., in the direction of an arrow in Fig. 8, and a plate lock lever 74 operates to lock the holder lock plate 48 when being urged to slide in the position that its engagement with the lock pins 47, 47 is released through a lock release mechanism 81 which will be described later. The plate lock lever 74 has one end rotatably mounted to the front face of the chassis 2 by the one guide pin 71 or left guide pin in Fig. 8 to be held between the front face of the chassis 2 and the holder lock plate 48, and it receives counterclockwise torque as viewed in Fig. 8 from the coil spring 73 for plate operation which has one end engaged with a spring engagement portion 76 arranged in the vicinity of the one end of the plate lock lever 74. As best seen in Fig. 8, when the lock release mechanism 81 which will be described later urges to move the holder lock plate 48 up to the position that its engagement with the lock pins 47, 47 is released, an engaging portion 77 arranged to the plate lock lever 74 at its upper end is engaged with an engaged portion 78 arranged to the holder lock plate 48 so as to restrict movement of the holder lock plate 48 in the direction to engage the pin engagement portions 49, 49 with the lock pins 47, 47, i.e., in the direction of an arrow A in Fig. 8, so that the holder lock plate 48 is locked in that position. Additionally, the plate lock lever 74 has another end formed with a pressed portion 79 for lock release which is pressed, when the holder 4 is being in the loading position, by a pressing portion 80 arranged to the holder cover portion 44, rotating clockwise the plate lock lever 74 as viewed in Fig. 8 to release engagement of the engaging portion 77 with the engaged portion 78. Thus, the holder lock plate 48 is urged to automatically slide leftward as viewed in Fig. 8 by force of the coil spring 73 for plate operation, so that the pin engagement portions 49, 49 are engaged with the lock pins 47, 47 arranged to the end face plate 46 of the holder cover portion 44 to hold the holder 4 in the loading position. Next, the lock release mechanism 81 will be described. As best seen in Figs. 3 and 10, the lock release mechanism 81 comprises a hook-shaped rotating lever 85 having one end formed with an engaging portion 82 which is engaged with an engaged portion 83 arranged to the holder lock plate 48 and a center portion pivotally supported on a lower face of the chassis 2 by a shaft 84, a slide lever 89 having one end pivotally supported to another end of the rotating lever 85 by a shaft 86 and slidably mounted on the lower face of the chassis 2 by fitting in guide holes 87, 87 guide pins 88, 88 arranged on the lower face of the chassis 2, a cam gear 92 formed with a cam protrusion 91 for pressing a pressed portion 90 arranged to another end of the slide lever 89, a pinion 93 engaged with the cam gear 92, and a helical gear 95 mounted to a rotation shaft 94 of the pinion 93 and engaged with the lead screw 25 on the chassis 2. When rotating the lead screw 25 in one direction, the cam gear 92 is rotated counterclockwise, i.e., from a state of a two-dotted chain line to a state of a broken line in Fig. 3, through the helical gear 95 and the pinion 93, so that the cam protrusion 91 presses the pressed portion 90, thus sliding the slide lever 89 to the rotating lever 85 so as to rotate the rotating lever 85 on the shaft 84 counterclockwise, i.e., in the direction of an arrow C in Fig. 3. With counterclockwise rotation of the rotating lever 85, the engaging portion 82 arranged at the one end of the rotating lever 85 presses the engaged portion 83 so as to slide the holder lock plate 48 in the lock release direction. Referring to Fig. 11, the head carriage 23 is provided with a feed spring or needle 98 engaged with a screw groove 96 of the lead screw 25 for changing rotational motion of the lead screw 25 into linear motion of the head carriage 23, and a plate spring 99 having a flat contact surface 99a which contacts a peripheral surface of the lead screw 25 for giving a load of the head carriage 23 on the lead screw 25. Referring also to Fig. 12, the needle 98 is formed out of the plate spring 99 which undergoes press working, etc. so that a part of the plate spring 99 protrudes from a lower face thereof, and it is engaged with the screw groove 96 of the lead screw 25. Substantially the entirety of the lower face of the plate spring 99 from which the needle 98 protrudes forms the contact surface 99a which contacts, as shown in Fig. 12, a top of the screw groove 96 of the lead screw 25 over some pitches. Additionally, a lead screw support 100 is arranged to the head carriage 23 below the plate spring 99 and in parallel therewith, the lead screw 25 being held between the lead screw support 100 and the lead screw contact surface 99a. Since the head carriage 23 has the above construction, when the lead screw 25 is rotated by the stepping motor 26, the head carriage 23 travels along the guide shaft 24 through the needle 98 engaged with the screw groove 96. At that time, since a load of the head carriage 23 is dispersely given to the peripheral surface of the lead screw 25 by the lead screw contact surface 99a of the lower face of the plate spring 99, a load to be given to the needle 98 is reduced, resulting in restraint of wear of the needle 98 and the screw groove 96 which are in contact therewith. It is to be noted that in the above embodiment, the needle 98 and the lead screw contact surface 99a are integrally formed with the plate spring 99, alternatively, the lead screw contact surface 99a may be formed with a member other than the needle 98. As best seen in Fig. 12, a ring groove 97 is formed adjacent to one end of the screw groove 96 of the lead screw 25. Even when the feed spring or needle 98 of the head carriage 23 engaged with the lead screw 25 deviates from the range of the screw groove 96 upon operation of the lock release mechanism 81, the feed spring 98 is smoothly rotated along the ring groove 97, preventing occurrence of noises and vibrations by the feed spring 98 deviating from the range of the screw groove 96. Referring again to Fig. 2, a cartridge ejecting lever 101 is rotatably mounted to the main body portion 43 of the holder 4 by a shaft 102. When inserting the disk cartridge 42 into the holder main body portion 43, the cartridge ejecting lever 101 is pressed by a front face of the disk cartridge 42 to rotate against force of a lever return spring 103, providing torque to the disk cartridge 42 in the ejecting direction, so that upon ejection, it is rotated backward by force of the lever return spring 103 to eject the disk cartridge 42 from the holder main body portion 43. Referring also to Fig. 13, the cartridge ejecting lever 101 is formed out of a plate spring member, and has an upper end integrated with an elastic stopper lug 104 which is, as shown in Figs. 14 and 15, in press contact with a lower face of a roof 43a of the holder main body portion 43. When the cartridge ejecting lever 101 is rotated up to a predetermined position by being pressed by the disk cartridge 42, the elastic stopper lug 104 is elastically returned to engage with an engagement portion 105 arranged to the roof 43a of the holder main body portion 43 as shown in Figs. 16 and 17, preventing backward rotation of the cartridge ejecting lever 101, whereas when closing the holder cover portion 44, the elastic stopper lug 104 is pressed by a stopper pressing portion 106 formed on the holder cover portion 44 to release engagement with the engagement portion 105 as shown in Figs. 18 and 19. Next, the operation of the cartridge loading mechanism will be described. When inserting the disk cartridge 42 into the holder main body portion 43 in a state as shown in Fig. 4, the cartridge ejecting lever 101 is rotated by being pressed by the disk cartridge 42. If the disk cartridge 42 comes at a predetermined position, the elastic stopper lug 104 is engaged with the engagement portion 105 of the holder main body portion 43 to lock the cartridge ejecting lever 101. Thereafter, if the upper face of the holder cover portion 44 is pressed, the rotating levers 52, 52 of the holder drive mechanism 5 are rotated in a manner to come down so as to slide the slider 51 in the loading direction. Thus, the support shafts 3, 3 of the holder cover portion 44 are biased to the lower ends of the bearing holes 28, 28 of the bearing lugs 27, 27 through the inclined cam grooves 57, 57 of the slider 51, and the holder cover portion 44 is rotated on the support shafts 3, 3 so that the end face plate 46 closes the cartridge take-off opening 41 of the holder main body portion 43. Then, the stopper pressing portion 106 of the holder cover portion 44 presses the stopper protrusion 104 of the cartridge ejecting lever 101 to release lock thereof. The cartridge ejecting lever 101 presses the disk cartridge 42 on the side thereof by force of the lever return spring 103 to put the disk cartridge 42 in press contact with the end face plate 46 of the holder cover portion 44, thus fixing the disk cartridge 42 in the holder 4. When pressing further the holder cover portion 44, it lies on the holder main body portion 43, which are rotated up to the loading position. If the holder 4 comes at the loading position, the pressed portion 79 for lock release of the plate lock lever 74 is pressed by the pressing portion 80 arranged to the holder cover portion 44, so that the plate lock lever 74 is rotated to release lock of the holder lock plate 48. Thus, the holder lock plate 48 is urged to slide in the lock direction by force of the coil spring 73 for plate operation to engage the pin engagement portions 49, 49 with the lock pins 47, 47 arranged to the end face plate 46 of the holder cover portion 44, thus holding the holder 4 in the loading position to carry out record or regeneration of the disk. When ejecting the disk cartridge 42 after completion of recording or regenerating operation, the lead screw 25 is rotated in one direction to operate the lock release mechanism 81. That is, with rotation of the lead screw 25 in one direction, the cam gear 92 is rotated through the helical gear 95 and the pinion 93, so that the cam protrusion 91 arranged to the cam gear 92 presses the pressed portion 90 arranged to the slide lever 89 to slide the slide lever 89. Sliding of the slide lever 89 causes rotation of the rotating lever 85 to slide the holder lock plate 48 in the lock release direction, thus releasing lock of the holder cover portion 44 by the holder lock plate 48, and locking the holder lock plate 48 in the release position by the plate lock lever 74. When releasing lock of the holder cover portion 44 by the holder lock plate 48, the slider 51 of the holder drive mechanism 5 is urged to slide in the unloading direction by force of the coil spring 58 for slider operation, thus biasing the support shafts 3, 3 to the upper ends of the bearing holes 28, 28 of the bearing lugs 27, 27 through the inclined cam grooves 57, 57, and rotating the holder 4 in the unloading direction by the rotating levers 52, 52. With rotation of the holder 4 in the unloading direction, the holder cover portion 44 is opened relative to the holder main body portion 43 by force of the torsion coil spring 45 interposed between the holder main body portion 43 and the holder cover portion 44 so as to remove blockage of the cartridge take-off opening 41 of the holder main body portion 43 by the end face plate 46. Thus, the disk cartridge 42 received in the holder main body portion 43 is automatically ejected from the cartridge take-off opening 41 by the cartridge ejecting lever 101. Then, in a manner as described above, the lead screw 25 is rotated in one direction to operate the lock release mechanism 81. After completion of lock release of the holder 4 by the holder lock plate 48, the lead screw 25 is reversed to remove pressing of the slide lever 89 by the cam gear 92 and return the head carriage 23 to the reference position for subsequent loading action. In a variant of the present invention, instead of having the support shafts 3, 3 attached to the holder's cover portion 44 as shown in the embodiment illustrated in the drawings, the support shafts 3, 3 may alternatively be attached to the holder's main body portion 43. Further, the bearing holes 28, 28 for guiding vertical movement of the support shafts 3, 3 may be replaced with guide pins arranged erectly to the chassis 2. The cartridge loading mechanism of the present invention having the above construction produces the following effect: 1) Since the support shafts of the holder are vertically movably mounted to the chassis, and urged to move upward upon unloading of the holder, the open angle of the holder is reduced upon unloading thereof, therefore, the spindle motor, head etc. are hard to see from below the holder, obviating the need for the screen, etc. 2) Since the holder drive mechanism for moving downward the support shafts when the holder is rotated in the loading position and moving upward the support shafts when the holder is rotated in the unloading position is constructed by the slider to be urged to slide along the chassis for moving vertically the holder, and the rotating levers having one end pivotally supported to the slider and another end pivotally supported to the chassis for rotating the holder in the unloading direction when the slider is biased in the direction to move upward the holder, and in the loading direction when the slider is biased in the direction to move downward the holder, the support shafts can vertically be moved in linkage with rotation of the holder. Further, due to a reduction in the open angle of the holder, the thickness of the main body of the cartridge loading mechanism can be decreased. 3) Since the lead screw fulfills lock release, the motor for use in the lock release mechanism is not needed, allowing a reduction in number of parts, resulting in a decrease in size and weight as well as a cost down. 4) Since the cartridge ejecting lever is integrally formed with the elastic stopper lug for preventing return motion of the cartridge ejecting lever, the elastic stopper lug returning elastically to engage with the engagement portion arranged to the holder when the cartridge ejecting lever is pressed by the disk to rotate up to a predetermined position, an arm lock mechanism independent of the cartridge ejecting lever is not needed, enabling a reduction in number of parts and cost. Further, a space for assembling the arm lock mechanism is not needed, resulting in an advantage in terms of a reduction in size, thickness, and weight of the disk drive mechanism.

Claims: A cartridge loading mechanism for use in a disk recording and/or reproducing device for recording and/or reproducing signals on a disk received in a cartridge (42), comprising : a chassis (2); a holder (4) arranged to hold the cartridge, said holder having one end rotatably supported to said chassis for allowing the holder to adopt an open position for loading and unloading the cartridge and a closed position for placing the holder in a loaded position, said holder having a fulcrum (3); and a supporting and guiding means (5) for moving said fulcrum of said holder away from said chassis in accordance with a rotation of said holder in a direction of said open position, and moving said fulcrum of said holder near to said chassis in accordance with a rotation of said holder in a direction of said closed position; characterized in that said fulcrum (3) of said holder (4) is retained within an elongate opening (28) formed in lugs (27) which are unitary with said chassis (2) and acts as a groove for said fulcrum. A cartridge loading mechanism as claimed in claim 1, wherein said fulcrum of said holder includes a support shaft (3) attached to said chassis (2) or said holder (4). A cartridge loading mechanism as claimed in claim 2, wherein said supporting and guiding means (15) include a slider (51) which is urged to slide along said chassis (2) for moving vertically said support shaft (3), and a rotating lever (52) having one end (61) pivotally supported to said slider and another end (62) pivotally supported to said holder (4), said rotating lever rotating said holder in said direction of said open position when said slider (51) is urged to slide so as to separate said support shaft from said chassis, and in said direction of said closed position when said slider is urged to slide so as to bring said support shaft near to said chassis. A cartridge loading mechanism as claimed in claim 3, wherein said slider (51) is formed with an inclined cam groove (57) which is engaged with said support shaft (3). A cartridge loading mechanism as claimed in claim 4, wherein said slider (51) is provided with a resilient member (58) for biasing said slider in said open position with respect to said chassis (2). A cartridge loading mechanism as claimed in claim 1, wherein said holder (4) includes a main body portion (43) having an opening (41) for receiving and holding the cartridge (42) inserted therefrom, a cover portion (44) rotatably supported to said main body portion, and a resilient member (45) interposed between said main body portion and said cover portion for biasing said main body portion to be away from said cover portion. A cartridge loading mechanism as claimed in claim 6, wherein said holder (4) is provided with an ejecting lever (101) rotatably mounted to said main body portion (43) to be biased to eject the cartridge (42) inserted from said opening (41) of said main body portion. A cartridge loading mechanism as claimed in claim 7, wherein said ejecting lever (101) is integrally formed with a stopper lug (104) which is in engagement with an engagement portion (105) of said main body portion (43) for restricting a rotation of said ejecting lever in a direction to eject the cartridge (42), said engagement with said engagement portion being released when said stopper lug is pressed by a pressing portion of said cover portion. A cartridge loading mechanism as claimed in any one of claims 1 to 8, further comprising : a head carriage (23) provided with a head (22) for recording and/or regenerating the signals on the disk (42), said chassis (2) being arranged to slidably support said head carriage in a manner to be movable in a radial direction of the disk, and being provided with a drive means for driving said head carriage; a lock means (47, 48) for carrying out a lock of said holder in said open position thereof; and a lock release means, engaged with said lock means, for driving said lock means to release said lock of said holder in accordance with an actuation of said drive means. A cartridge loading mechanism as claimed in claim 9, wherein said drive means (25, 26) includes a motor (26) and a feed screw (25) which is rotated by said motor for moving said head carriage (23), and said lock release means (81) includes a gear (95) meshed with said feed screw (25). A cartridge loading mechanism as claimed in claim 10, wherein said feed screw (25) is formed with a helical groove, and a ring groove adjacent to one end of said helical groove. A cartridge loading mechanism as claimed in claim 9, wherein said lock means includes a lock member (48) movably mounted to said chassis (2) for locking said holder (4) by engaging with an engagement portion (76) of said holder, a resilient member (73) for biasing said lock member to engage with said engagement portion of said holder, and a lock lever (74) for locking said lock member when said lock release means releases said engagement of said lock member with said engagement portion of said holder (4). A cartridge loading mechanism as claimed in claim 12, wherein said lock release means (81) includes a connection means (85) engaged with said lock member (48) for driving said lock member to release said engagement of said lock member with said engagement portion of said holder through said gear (95) meshed with said feed screw (25). A cartridge loading mechanism as claimed in claim 9, wherein said head carriage (23) is provided with a plate spring having a needle portion engaged with said groove of said feed screw (25) for converting a rotational motion of said feed screw into a slide motion of said head carriage and a contact surface portion which comes in contact with said feed screw on the peripheral face thereof, and is integrally formed with a support for holding said feed screw between said plate spring and said support.

Inventors: KANADA TOKIO, KANADA, TOKIO, KANADA, TOKIO, C/O SONY CORPORATION
Applicants: SONY CORP, SONY CORPORATION
Application year: 1992
Main classification: G11B17
IPC codes: G11B17