JP2007115377A - Disk unit - Google Patents

Abstract

When a disk is clamped by a plurality of vertical movements of a clamp head by a loading motor of the disk device, the loading motor is prevented from being damaged and durability is improved.
In order to enable the clamp head to clamp or release the center hole of the disk by moving the frame member up and down, and to load or unload the disk into or out of the main body, the disk is A disc having a plurality of arms that are supported on the frame member and moved forward and backward in the horizontal direction and a drive mechanism that moves the frame member up and down, and that the frame member is moved up and down a plurality of times to clamp the center hole of the disc. In the apparatus, at the time of transition in which the direction of the voltage supplied to the loading motor serving as the drive source of the drive mechanism of the frame member is reversed, a minute period in which the supply of voltage is stopped is interposed.
[Selection] Figure 39

Description

  The present invention relates to a disc (for example, CD-R / RW, DVD-R / -R / RW / RAM) that is optically recorded / reproduced as a recording medium for recording a large amount of information in information equipment such as various computer systems. / + R, etc.).

  Generally, a disk device built in a personal computer (hereinafter referred to as a personal computer) or the like is usually provided with a disk tray for loading a disk, and the disk tray is configured to move forward and backward. Then, the disk loaded in the disk tray is driven in the main body of the disk device, and information is recorded or reproduced.

  On the other hand, as a system that does not use a disk tray, so-called slot-in type disk devices tend to be often employed, which is suitable for making a personal computer thinner and smaller. In this slot-in type disk device, the disk tray is not used for loading (unloading) / unloading (unloading) the disk into the device body, so the operator inserts the majority of the disk into the slot from the slot of the bezel on the front of the device Thereafter, the loading mechanism of the apparatus main body operates to automatically load.

  41 and 42 show the configuration and operation of the loading mechanism in the conventional slot-in type disk apparatus. In the configuration shown in the figure, when the operator inserts the disc D, the disc D is inserted into the pin 100a at the front end of the first oscillating body 100, the left and right guide bodies 101 and 102, and the second oscillating body 103 from the middle. The position reaches the position shown in FIG. 41 while the height direction and the left-right position are restricted by the pin 103a at the tip.

  At this time, the first rocking body 100 is rotated in the direction of arrow 100A by pushing the tip pin 100a by the disk D, and the second rocking body 103 is also pushed by the disk D by the tip pin 103a being pushed by the arrow 103A. Rotate in the direction. Then, the switch lever 104 is pushed by the end of the second oscillating body 103 and rotates in the direction of the arrow 104A, and the detection switch 5 is operated.

  When the detection switch 105 is activated, the driving means 106 is started, and the movement of the first slide member 107 in the direction of the arrow 107A is started. The first slide member 107 and the second slide member 108 are connected at their respective ends by a slide connecting member 109, and the slide connecting member 109 is pivotally supported by a pin 110 so that the first slide member 107 and the second slide member 108 are pivoted. In synchronization with the retraction of the slide member 107, the second slide member 108 advances in the direction of the arrow 108A.

  In this way, when the first slide member 107 starts to move backward, the first oscillating body 100 rotates in the direction of the arrow 100B, whereby the pin 100a at the tip of the first oscillating body 100 positions the disk D in the disk positioning. It is conveyed in the direction of the arrow 107A until it comes into contact with the pins 111a and 111b of the member 111.

  At this time, since the pin 103a of the second rocking body 103 rotates in the direction of the arrow 103A, the pin 103a of the second rocking body 103 is synchronized with the pin 100a at the tip of the first rocking body 100 and the disk D is rotated. After moving in the direction of the arrow 103A while being supported and the disk D abuts on the pins 111a and 111b of the disk positioning member 111, the disk D rotates to a position slightly away from the disk D.

  The above is the operation mode of the loading mechanism when the disk D is carried into the apparatus, but the loading mechanism when the disk D is carried out of the apparatus is the operation mode opposite to that described above. That is, when the disk D is in a fixed position inside the apparatus, when the driving means 106 is started in the reverse direction based on the unload instruction, the first slide member 107 starts to advance in the direction of the arrow 107B, and the slide The second slide member 108 connected to the connection member 109 starts to retract in the direction of the arrow 108B in synchronization. As a result, the first rocking body 100 rotates in the direction of the arrow 100A and the second rocking body 103 rotates in the direction of the arrow 103B, so that the disk D is supported by the pins 100a and 103a at the respective leading ends and carried out of the apparatus. Will be.

  The disk D carried into the apparatus is clamped by a clamp head 112 that moves up and down at a fixed position. The clamp head 112 is integrated with a turntable 113 fixed to a drive shaft of the spindle motor 114. The spindle motor 114 is disposed on a frame member 115, and the frame member 115 is moved up and down by an elevating mechanism. It is made to move (for example, patent document 1).

As described above, in the system in which the clamp head 112 is moved up and down to clamp the center hole Da of the disk D, there is a case where the clamping is not reliably performed and the disk cannot be driven. Such inconvenience occurs when the disk D has a step d1 as shown in FIG. 43 (A) and a groove d2 as shown in FIG. 43 (B) in the center hole Da of the disk D, or when the recording layer is multi-layered. As shown in FIG. 43 (C), it frequently occurs in the disk in which the groove d3 is formed by the intermediate layer. Therefore, even in such a disk, in order to improve the success rate of the clamp, the clamp head has been moved up and down a plurality of times (for example, Patent Document 2).
JP 2002-117604 A JP 2005-85449 A

  As described above, when the vertical movement of the clamp head is performed a plurality of times, the probability of unsuccessful clamping can be greatly reduced. In this operation, the drive mechanism that moves the clamp head up and down is repeatedly operated within a small range of the disk clamp position. This is because the motor that is the power source of the drive mechanism repeats normal rotation and reverse rotation. It is done by.

  FIG. 44 shows the state of the voltage supplied to the motor in order to control the operation of the drive mechanism in this way. As shown in the figure, when the disk D inserted from the slot is detected, supply of a positive voltage (+ V) for automatic loading to the loading motor is started (t1), and the loading motor is driven. Accordingly, the disk D is loaded into the main body, and when the disk D reaches the clamp head, the clamp head moves up and down to perform the first clamping operation on the center hole Da (t2 to t4). .

  When the first clamping operation is completed, a negative voltage (-V) is required for the loading motor to move the clamp head up and down immediately after the first clamping operation regardless of whether or not the disk D is clamped. It is supplied only for a period (t4 to t6). As a result, the drive mechanism reverses, so that the clamp head moves up and down again, and the second clamping operation is performed. At the same time when the supply of the negative voltage (−V) is stopped (t6), the positive voltage (+ V) is supplied again to the loading motor for a period necessary for the vertical movement of the clamp head (t6 to t8). . As a result, the drive mechanism rotates forward again, so that the clamp head performs the third clamping operation, and the clamp head that clamps the disk D stops at the final fixed position.

  In order to perform the clamping operation several times in this way, a positive voltage and a negative voltage are applied to the loading motor so that the forward rotation, reverse rotation, and normal rotation of the drive mechanism are repeated at the final stage of loading. Are alternately supplied. Conventionally, in such a method, the negative voltage (−V) is supplied simultaneously with the end of the supply of the positive voltage (+ V) (t4), and the supply of the negative voltage (−V) is also performed. The positive voltage (+ V) is supplied simultaneously with the end of (t6). This is because a negative voltage (−V) or a positive voltage (+ V) is supplied in a state where the loading motor has not finished moving in the forward direction or the reverse direction due to inertia. It has been confirmed that this causes the problems as described in (1).

  That is, since the rotor of the loading motor immediately after the supply of the positive voltage (+ V) or the negative voltage (−V) is stopped continues to rotate due to inertia, a counter electromotive current is generated in the coil wound by the loading motor. At the same time, supply of a negative voltage (−V) or a positive voltage (+ V) is started, so that the counter electromotive current is superimposed on the starting current and increases beyond the allowable range for the loading motor. Current will flow. FIG. 45 shows a current generation state in such a state, and in a loading motor having an allowable current value of about 600 mA, it was confirmed that a large current of 800 mA flows with a back electromotive current superimposed on the starting current. .

  As is well known, in the disk device targeted by the present invention, downsizing and thinning are important issues, and in order to improve durability against a large current, the loading motor cannot be unnecessarily enlarged. A compact loading motor designed in a range that allows a current to flow in a normal operation mode is employed. Therefore, when an excessive current as described above flows through such a loading motor, the commutator and the like are damaged, and the durability is greatly reduced. In the endurance test in the above-described state by the applicant of the present application, that is, a state in which a current exceeding the allowable range flows, it has been confirmed that a failure occurs in an average of 12,000 trials in the repeated operation of the loading motor.

  Therefore, the present invention solves the above problems by the means described below. That is, according to the first aspect of the present invention, a frame member provided with a disk drive mechanism comprising a turntable having a clamp head and a spindle motor is moved up and down to clamp or release the center hole of the disk by the clamp head. In order to load the disk into the main body or to unload the disk from the main body, a plurality of arms that support the disk on the frame member and move forward and backward in the horizontal direction and the frame member are moved up and down. In a disk apparatus comprising a drive mechanism for moving the frame member and vertically moving the frame member a plurality of times to clamp the center hole of the disk, a voltage supplied to a loading motor serving as a drive source of the drive mechanism of the frame member During a transition that reverses direction, the supply of voltage stops. Minute period that is to so interposed.

  According to the present invention, when the driving mechanism of the frame member is driven in reverse, a minute period in which the supply of voltage is stopped is interposed at the time of transition in which the direction of the voltage supplied to the loading motor is reversed. It is possible to avoid the influence of the counter electromotive current generated due to the inertia of the rotor of the loading motor during a very short period, thereby preventing damage to the loading motor and improving durability.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In order to facilitate understanding of the present invention, a description will be given including an overview of the overall configuration.

  FIG. 1 is a view showing the appearance of a slot-in type disk device 1 embodying the present invention. An opening 2a is formed at the center of a top plate of a chassis case 2 configured in a shield state. A convex portion 2b is formed on the peripheral edge of the opening 2a. The convex portion 2b is formed with a first inclined surface 2c having an upward gradient (downward gradient on the back surface) toward the front end which is continuous with the convex portion 2b. An inclined surface 2d is formed.

  A bezel 3 is fixed to the front end of the chassis case 2, and a slot 3a for inserting the disk D and through holes 3b and 3c for releasing emergency are formed in the bezel 3. Further, the bezel 3 is provided with a push button 4 for instructing to carry out the stored disk D to the outside of the apparatus and an indicator 5 for displaying the operation state of the disk apparatus 1.

  FIG. 2 is a plan view of the disk device 1 with the top plate portion of the chassis case 2 removed, and a perspective view thereof is shown in FIG. In the figure, a base panel 6 is disposed in the chassis case 2, and a disk drive mechanism A for rotating the disk D in a state of being disposed obliquely downward from the center thereof is provided. In this disk drive mechanism A, a frame member 8 that can be moved up and down in a horizontal state is released at a plurality of positions by a known buffer support structure 9 in order to release the state where the center hole Da of the disk D is clamped or clamped. It is connected to the base panel 6 at three places (in this embodiment) (see FIG. 4 and the blowout view). The drive structure of the frame member 8 is a cantilever state in which one end is pivotally supported, the tip part is swung and the clamp head is moved up and down, and the frame member 8 is moved up and down in a horizontal state. There is.

  At the tip of the frame member 8, a clamp head 7 is disposed at a position corresponding to the center of the disk D that has been loaded and stopped. The clamp head 7 is formed integrally with the turntable and is fixed to a drive shaft of a spindle motor 11 arranged immediately below. The disk D clamped to the clamp head 7 is driven by the spindle motor 11 and driven. Information recording / reproduction is performed.

  Next, a symbol B is a head unit supported by the frame member 8, and a carrier block 13 for reciprocating the optical pickup 12 in the diameter direction of the disk D is a guide shaft 14 having both ends fixed to the frame member. -It is supported by 15 and is reciprocated by a thread motor 16 and a gear unit (not shown). Reference numeral 17 denotes a disk support arm that guides the disk D into the apparatus and pushes it out of the apparatus. A holder 18 that supports the end of the disk D is fixed to the tip of the disk support arm.

  Next, the drive mechanism C that swings the disk support arm 17 will be described. As shown in FIG. 4, the end serving as the swing fulcrum of the disk support arm 17 is integrated with the support plate 19 as shown in FIG. 4, and the support plate 19 can be turned by the pivot pin 20. Therefore, the disk support arm 17 on the base panel 6 swings within the range of the slit 6a as the support plate 19 turns.

  FIG. 6 shows a planar state in which the drive mechanism C of the disk support arm 17 is configured with the base panel 6 removed, and the first link arm 21 that directly drives the disk support arm 17 is the support plate 19. Are connected by a pivot pin 17b and are always urged by a tension coil spring 22. On the other hand, slits 23 a and 23 b are formed in the second link arm 23 as shown in FIG. 7, and rivet pins 24 are inserted through the slits 23 a and 23 b, and their tips pass through the first link arm 21. The first link arm 21 and the second link arm 23 are fixed to the holes 21a and 21b, and are integrated in a stretchable manner within the range of the slits 23a and 23b. The first link arm 21 and the second link arm 23 are formed with notches 21c and 23c on which a lock mechanism described later acts.

  Reference numeral 25 denotes a lever arm for transmitting a driving force to the second link arm 23. A through hole 25a serving as a fulcrum is supported by a pivot pin 25d so as to be swingable. A pivot pin 25 b is fixed to the working end of the lever arm 25, and the pivot pin 25 b is inserted into the through hole 23 d of the second link arm 23 and the through hole 26 a of the lock lever 26. A torsion coil spring 27 is disposed between the second link arm 23 and the lock lever 26, one end 27a of the second link arm 23 is engaged with the recess 23e, and the other end 27b is a lock lever. It is latched by the recessed part 26b of 26. As a result, the locking end 26 c of the lock lever 26 is biased in a direction to engage with the cutout portion 21 c of the first link arm 21 and the cutout portion 23 c of the second link arm 23. When the first link arm 21 has a predetermined angle on the back surface of the base panel 6, when the limit switch 28 operated at the rear end thereof and the second link arm reach a predetermined position, An activation pin 29 for pressing the rear end portion 26d of the lock lever 26 is provided.

  Next, the configuration of the slider mechanism and the transport mechanism E, which serve as a power transmission element to the drive mechanism C of the disk support arm 17, will be described. First, the transport mechanism E is roughly configured by a combination of a loading gear unit G1 and a rack gear unit G2. 8 and 9 are diagrams for explaining the configuration and operation mode of the loading gear unit G1. In the figure, reference numeral 30 denotes a loading motor as a power source. A worm gear 31 is fixed to the output shaft of the loading motor 30 so as to rotate coaxially, and the rotational force of the worm gear 31 is pivotally supported by the gear base 35. The signals are transmitted to the double gears 32, 33, and 34 while being decelerated from the small diameter gear to the large diameter gear.

  In the gear configuration, the double gear 32 includes a release mechanism that releases the meshed state with the worm gear 31. This is because the end portion 36a of the holder 36 that is slidable in the vertical direction while holding the double gear 32 is inserted into the pivot pin 37 and is urged downward by the compression coil spring 38 to be pivotally supported. In this state, as shown in FIG. 8C, the worm gear 31 and the double gear 32 are in a normal meshing state. A dog head 36b is formed at the end of the holder 36 on the side of the loading motor 30 so that a knob 39a of a limit switch 39 fixed to the gear base 35 can be operated.

  On the lower surface of the end portion 36 a of the holder 36, a slider member 40 that is pivotally supported coaxially with the pivot pin 37 is provided. A long groove 40 a is formed in a portion of the slider member 40 that is pivotally supported by the pivot pin 37, so that the slider member 40 can slide in a direction perpendicular to the end 36 a of the holder 36. In addition, the slider member 40 has an inclined surface 40b formed between the front end and the rear end. When the slider member 40 is advanced, the inclined surface 40b pushes up the end portion 36a of the holder 36 from the bottom surface. The entire holder 36 is raised.

  A long groove 40d having a locking step 40c that is pivotally supported by the pivot pin 41 is formed at the rear end of the slider member 40, and an action piece 40f having a protrusion 40e is formed at the rear end. Yes. On the other hand, a reset piece 40g that is activated in accordance with the movement of the rack gear unit G2 is formed at the front end of the slider member 40.

  The slider member 40 integrally configured in this way has a tension coil spring 42 provided with a tilt angle between the hook piece 40h and the hook piece 35a of the gear base 35 so as to have a tilt angle. The member 40 is urged so as to rotate counterclockwise while always retracting.

  Since the slider member 40 is configured as described above, the slider member 40 uses the pivot pin 37 as a fulcrum in the steady state shown in FIG. In this state, when the slider member 40 is pushed forward from the rear end portion and reaches the locking step portion 40c of the long groove 40d of the pivot pin 41, the slider member 40 is pivoted by the tension of the tension coil spring 42. As shown in FIG. 9, the locking step portion 40c and the pivot pin 41 are engaged with each other to be locked, and the posture is maintained.

  Next, as shown in FIG. 10, in the rack gear unit G2, gear trains 43a and 43b are integrally formed with the loading slider 43, and the gear train 43a meshes with the small-diameter gear of the double gear 34 of the loading gear unit G1. Therefore, by driving the loading motor 30, the loading slider 43 moves forward or backward in the chassis case 2. When the loading slider 43 is moved forward or backward in this way, the drive mechanism C connected to the tip of the loading slider 43 is driven to swing the disk support arm 17 and the surface of the base panel 6 shown in FIG. Thus, the attracting arm 50 is swung by the lever arm 44 connected to the loading slider.

  On the loading slider 43 configured in this manner, a gear member 45 that moves forward and backward at the tip end of the loading slider 43 is arranged in a floating state, and the block 46a is moved forward and backward to press and advance the gear member 45. -The pressing pin 46 provided with 46b is arrange | positioned. The gear train 43b and the gear member 45 are engaged with and coupled to a double gear 47 attached to the gear frame 48 so as to freely rotate. In this case, the large-diameter gear 47a of the double gear 47 meshes with the rear end portion of the gear train 43b, and the small-diameter gear 47b meshes with the front end portion of the gear member 45 formed integrally with the block 46b.

  Therefore, when the gear member 45 is pushed in by an external force via the pressing pin 46, the double gear 47 rotates at a fixed position, so that the rotational force of the large-diameter gear 47a is transmitted to the gear train 43b, and the loading slider 43 moves. Reference numeral 49 denotes an action piece for pressing the reset piece 40g formed at the front end portion of the slider member 40 of the loading gear unit G1 described above. When the loading gear unit G1 is in the state shown in FIG. When the reset piece 40g of the slider member 40 is pressed, the engagement between the pivot pin 41 and the locking step portion 40c is released, so that the state shown in FIG. 8 is restored.

  Finally, the configuration and operation mode of the lifting mechanism of the frame member 8 will be described. The elevating mechanism includes a loading slider 43, slide members 51 and 52 that move forward and backward in synchronization with the loading slider 43, and driven pins that are guided by cam grooves formed in the loading slider 43 and the slide members 51 and 52. 53. The slide member 51 is connected to the loading slider 43 by a link member 55a, and the slide member 51 is connected to the slide member 52 by a link member 55b. As a result, the loading slider 43 and the slide members 51 and 52 are moved forward and backward synchronously. FIG. 4 shows a state where the loading slider 43 is most advanced, and FIG. 5 shows a state where it is most retracted.

  The driven pins 53 fixed to the frame member 8 are arranged so that their open ends engage with cam grooves formed in the loading slider 43 and the slide members 51 and 52, respectively. Since the engagement relationship between the driven pin 53 and each cam groove is common, the engagement relationship between the cam groove of the loading slider 43 and the driven pin 53 will be described below as a representative example.

  First, in the embodiment shown in FIGS. 11 to 17, an elastic ring 54 having flexibility is attached to the driven pin 53 fixed to the frame member 8. On the other hand, the cam groove formed in the loading slider 43 is not in contact with the cam groove 43c in which the driven pin 53 is slidably guided and in the process in which the driven pin 53 is guided by the cam groove 43c. It is formed so as to have a double cam structure with a cam groove 43d that is in a loose fit state.

  In the high level portion P2 of the cam grooves 43c and 43d, the cam groove 43d is formed to be substantially equal to the diameter of the elastic ring 54 in order to hold the elastic ring 54, and the cam groove 43c is formed in the high level portion P2. The groove formation is completed in the vicinity of the entrance, and the state is opened to the high-order part P2. Therefore, in the range where the cam groove 43c is formed, the driven pin 53 is regulated and supported by the cam groove 43c, and the driven pin 53 is supported via the elastic ring 54 when reaching the high position portion P2.

  Next, an operation mode of the lifting mechanism of the frame member 8 configured as described above will be described with reference to FIGS. FIG. 11 shows an initial state in which the disk D is carried into the disk apparatus 1 and stopped at a position where the center hole Da of the disk D faces the clamp head. In this state, since the driven pin 53 is in the lower position P1 of the cam groove 43c, the frame member 8 is most lowered, and the clamp head 7 is in a state of waiting for ascending. When the loading slider 43 starts to retreat from this state, the driven pin 53 is guided by the inclined portion P3 of the cam groove 43c and gradually rises as shown in FIG. 12, and the frame member 8 and the clamp head 7 are also raised accordingly. Start.

  When the driven pin 53 guided in the cam groove 43c further moves up the inclined portion P3 as shown in FIG. 13, the chuck claw 7a of the clamp head 7 comes into contact with the opening end portion of the center hole Da of the disk D. When the clamp head 7 ascends from this state as shown in FIG. 14, the chuck claw 7 a pushes up the disk D and presses the opening end of the center hole Da against the convex part 2 b of the opening 2 a of the chassis case 2. Further, when the driven pin 53 is guided and reaches the top of the cam groove 43c as shown in FIG. 15, the clamp head 7 is fitted into the center hole Da of the disk D, and the chuck claw 7a is at the opening end of the disk D. The disk D is locked and the disk D is fixed on the turntable 10 to complete the clamping.

  The frame member 8 from which the loading slider 43 further retreats from the state of FIG. 15 is slightly lowered, and the elastic ring 54 is accommodated in the high-order part P2 as shown in FIG. In this way, the driven pin 53 is detached from the cam groove 43c, the restriction support by the cam groove 43c is released, and the driven pin 53 is elastically supported by the elastic ring 54. Will occur.

  FIG. 17 is a diagram illustrating a process of unloading the disk D. When the loading slider 43 is moved forward, the driven pin 53 follows a process opposite to that described above, and the disk is released by the clamp release pin 56 in the process of reaching the lower position P1. D is detached from the clamp head and can be carried out of the apparatus. In order to facilitate understanding of the operation mode described above, FIG. 18 shows a process of clamping the disk D, and FIG. 19 shows a continuous process of releasing the clamp of the disk D.

  Next, the configuration and operation mode of the attracting arm 50 driven by the loading slider 43 will be described below. FIG. 20 shows a configuration for driving the attracting arm 50. A guide slit 6b is formed in the base panel 6 at a position overlapping with the guide groove 43e formed in the loading slider 43, and the guide groove 43e and the guide slit 6b are formed. The driven pin 57 fixed to the tip of the lever arm 44 is inserted, and the guide slit 6b located at a fixed position with respect to the guide groove 43e moving forward and backward interacts to control the operation of the driven pin 57. ing.

  As shown in FIG. 21, the pulling arm 50 has a lever arm 44 pivotally supported by a pivot pin 59 at a base end portion rotatably supported by a pivot pin 58. A holding groove for the disk D is formed at the tip of the attracting arm 50, and a roller 60 is disposed inside the holding groove. Since the attracting arm 50 is configured in this way, it swings within the chassis case 2 with the operation of the lever arm 44 so that the disk D can be carried into the apparatus.

  FIGS. 21 to 25 show the operation mode of the attracting arm 50 and will be described in correspondence with the operation mode of the driven pin 53 guided by the cam groove 43 c of the loading slider 43. FIG. 21 shows a state in which the disk D has been inserted into the disk device 1 by the operator. The disk D is pushed back on the front end side in the loading direction of the disk D, and the disk support arm 17 swings rearward. The arm 21 is in an initial state where the limit switch 28 is operated and the drive mechanism C starts operating. Accordingly, the loading slider 43 is positioned at the foremost end as shown in FIG. 6A, and the driven pin 57 of the lever arm 44 is at the rear end position of the guide groove 43e as shown in FIG.

  In this state, when the drive mechanism C starts operating, the loading slider 43 starts to move backward as shown in FIG. At this time, since the driven pin 57 is sandwiched between the inclined surface of the rear end of the guide groove 43e and the side wall of the guide slit 6b, the driven pin 57 is also retracted as the loading slider 43 is retracted, and the lever arm 44 is By being pulled, the attracting arm 50 swings and the disk D is chucked by the disk support arm 17, and the loading of the disk D is started. At this time, the driven pin 53 is moving in the horizontal portion of the lower portion P1 of the cam groove 43c as shown in FIG. 22B, and the height does not change.

  FIG. 23 shows a state where the loading slider 43 is further retracted and the driven pin 57 reaches the top of the guide slit 6b. The loading of the disk D is continued by the swinging of the attracting arm 50, and the center hole of the disk D is shown. In this state, Da reaches a position that coincides with the clamp head 7. At this time, the driven pin 53 starts to increase the upward slope of the inclined portion P3 of the cam groove 43c as shown in FIG.

  FIG. 24 shows a state where the loading slider 43 is slightly retracted from the position of FIG. 23, and the driven pin 57 is pushed into the lateral groove at the top of the guide slit 6b by the guide groove 43e. At this time, the driven pin 53 reaches the top of the inclined portion P3 of the cam groove 43c as shown in FIG. 24B, and the clamp head 7 completes the clamping of the center hole Da of the disk D.

  FIG. 25 shows a state in which the loading slider 43 is retracted to the final position. In the process from FIG. 24 to FIG. 25, the driven pin 57 is further pushed into the lateral groove at the top of the guide slit 6b by the long groove at the front end of the guide groove 43e. As a result, the attracting arm 50 is slightly retracted from the position indicated by the phantom line in the drawing, and the chucking of the disk D is released. At this time, the driven pin 53 descends from the top of the cam groove 43c to the high-order part P2 as shown in FIG. 25B, and the disk D can be driven to rotate.

  26 to 30 show a state in which the disk support arm 17 and the attracting arm 50 are driven in synchronization, and correspond to the description of the steps of FIGS. 21 to 25.

  Next, the operation mode of the disk support arm 17 will be described. The drive mechanism C for driving the disk support arm 17 is constructed by assembling the mechanism elements shown in FIG. 7, and its operation is performed as the loading slider 43 moves forward and backward. That is, in FIG. 31, a driven pin 25c fixed to the end of the lever arm 25 is attached to a guide groove 43f formed in the loading slider 43 so as to be guided by the guide groove 43f. The state shown in the figure shows an initial state in which the operator inserts the disk D from the slot 3 a and the front end thereof is accommodated in the receiving end 18 a of the holder 18 at the tip of the disk support arm 17. At this time, since the rear end portion 26d of the lock lever 26 is pressed by the activation pin 29, the locking end 26c is interposed in the notches 21c and 23c of the first and second link arms 21 and 23. Not in a state.

  FIG. 32 shows a state in which the operator further pushes the disk D into the apparatus. The disk support arm 17 swings backward, and is connected to the base end of the disk support arm 17 by a pivot pin 17b. The first link arm 21 is pulled and the limit switch 28 is activated. At this time, since the lever arm 25 is connected to the stationary loading slider 43, the second link arm 23 connected to the lever slider 25 is kept in a fixed position. Therefore, the first link arm 21 is unlocked with respect to the second link arm, and the first link arm 21 slides and extends on the second link arm 23 as shown in FIG. It becomes a state.

  FIG. 33 shows a state in which the transport mechanism E starts to be driven based on the signal from the limit switch 28 operated as described above, and the loading slider 43 is retracted. In this state, as the loading slider 43 moves backward, the lever arm 25 is swung by the guide groove 43f, and the second link arm 23 slides forward so as to follow the first link arm 21. The locking end 26c of the lock lever 26 released from the pressing by the activation pin 29 is interposed in the cutout portions 21c and 23c of the first and second link arms 21 and 23, and the first and second links. The integration of the arms 21 and 23 is locked. That is, when the disk D is loaded, the first and second link arms 21 and 23 are temporarily displaced in the extending direction (from the state shown in FIG. 31 to the state shown in FIG. 32), and then displaced in the contracting direction (FIG. 32). 33 to the state shown in FIG. 33), the first and second link arms 21 and 23 are locked.

  FIG. 34 shows a state in which the disk support arm 17 swings backward as the loading slider 43 moves backward to carry the disk D, and the center hole Da of the disk D coincides with the clamp head 7. Until this time, the disk D is chucked and held by the holder 18 and the attracting arm 50, and the disk support arm 17 and the attracting arm 50 swing in synchronization. Up to this point, the driven pin 55c of the link member 55a only slides in the guide groove 43g of the loading slider 43 and is not affected by the backward movement of the loading slider 43.

  In the process of FIGS. 34 to 35, the disk support arm 17 is maintained at a fixed position because only the driven pin 25c of the lever arm 25 and the longitudinal groove portion of the guide groove 43f of the loading slider 43 are slid. On the other hand, since the driven pin 55c of the link member 55a is pushed up by the lateral groove portion of the guide groove 43g of the loading slider 43, the slide members 51 and 52 slide together with the loading slider 43 in the process from FIG. 34 to FIG. When the lifting / lowering function is activated, the clamp head 7 clamps the center hole Da of the disk D at the time shown in FIG.

  FIG. 36 shows a state in which the loading slider 43 is slightly retracted after the clamp head 7 clamps the center hole Da of the disk D. Thus, at the end of the vertical groove of the guide groove 43f of the loading slider 43, FIG. The lever arm 25 slightly swings and the disk support arm 17 also slightly swings as shown in the figure, so that the chucking of the disk D by the holder 18 is released. When this point is reached, the attracting arm 50 also slightly swings in synchronism, and the chucking of the disk D is released (see FIG. 25). Further, in the elevating mechanism of the frame member 8, the driven pin 53 is slightly lowered in the cam groove 43c, and the disk D can be driven to rotate (see FIG. 16).

  The above is the operation mode of the drive mechanism C when the disk D is loaded, but when the disk D is unloaded, the mechanism element of each part performs the reverse operation following the reverse path. That is, the transport mechanism E is driven in reverse, the loading slider 3 is advanced, and the disk support arm 17 swings forward from the state shown in FIG. 36 to the state shown in FIG. 33. In the state shown in FIG. 26 abuts the starting pin 29. When the loading slider 43 is further advanced, the rear end portion 26d is pressed by the activation pin 29, whereby the locking end 26c of the lock lever 26 is moved to the first link as shown in FIG. The arm 21 and the second link arm 23 swing away from the notches 21c and 23c, and the lock state in which the first link arm 21 and the second link arm 23 are integrated is released. The urging force of the tension coil spring 22 acts and the disk support arm 17 swings as shown in FIG. 37C, and the disk D is popped out of the slot 3a in the final moment of the final unloading process to complete the unloading. .

  Next, as described above as an object of the present invention, an operation mode for avoiding a problem occurring in the loading motor 30 in the repetition of the clamping operation of the disk D by the clamp head 7 will be described below with reference to FIG. To do. In the state shown in FIG. 4 in which the loading slider 43 is most advanced, the driven pin 53 is supported by the cam groove 43c and is located at the start end of the lower portion P1 (see FIG. 26).

  In this state, when the supply of the positive voltage (+ V) to the loading motor 30 is started (t1) by the start of automatic loading, the loading slider 43 starts to move backward and the loading of the disk D is started. When the driven pin 53 advances through the lower portion P1 of the cam groove 43c, it reaches the inclined portion P3 (t2 / see FIG. 11), and the driven pin 53, that is, the frame member 8 starts to rise under the action of the inclined portion P3 ( 12), the chuck claw 7a of the clamp head 7 reaches a position where it contacts the center hole Da of the disk D (t3 / see FIG. 13). When the driven pin 53 reaches the top of the inclined portion P3, the first clamping operation of the disk D by the clamp head 7 is completed (t4 / see FIG. 15), the driven pin 53 descends and the final position of the high-order portion P2 is reached. The position is reached (t5 / see FIG. 16).

  When the above state is reached and a minute period (t5 to t6) in which no voltage is supplied has elapsed, supply of a negative voltage (−V) is started (t6). The minute period (t5 to t6) is the time from when the voltage to the loading motor 30 is cut off and the rotation of the rotor stops and the back electromotive current disappears. In the configuration of the present invention, the loading motor 30 is loaded with the loading gear. Since the unit G1 receives a large braking, it was confirmed that about 60 milliseconds is a value that is not excessive or insufficient.

  In this way, when the negative voltage (−V) is supplied (t6 to t8), the loading motor 30 starts reverse rotation and the loading slider 43 moves forward, so that the clamp head 7 moves up and down, and the second time. The clamping operation is performed (t7). Accordingly, the period (t6 to t8) in which the negative voltage (−V) is supplied is set to a range necessary for the vertical movement for the clamp head 7 to perform the clamping operation.

  In this way, when the second clamping operation is completed, the driven pin 53 returns to the position of t8, so that it is necessary to return it to the final position of the high-order part P2. For this reason, when the negative voltage (−V) is interrupted (t8), the positive voltage (+ V) is supplied after the minute period (t8 to t9) during which no voltage is supplied (t9). Also in this case, the rotation of the rotor of the loading motor 30 is stopped, and the counter electromotive current disappears in this minute period (t8 to t9). Then, when the positive voltage (+ V) is supplied again (t9 to t11), the driven pin 53 returns to the final position of the high-order part P2 through the third clamping operation (t10) (t11).

  As described above, according to the present invention, since the voltage supply is stopped during the transition in which the direction of the voltage supplied to the loading motor 30 is reversed, the voltage is stopped. It is possible to avoid superposition of electromotive currents. FIG. 40 shows the measurement result of the value of the current flowing through the loading motor 30 in the operating state of the present invention. When the supply of voltage is stopped at t5 (t8), the counter electromotive current Ph1 is generated. Then, a minute period t5 to t6 (t8 to t9) elapses, and the starting current Ph2 flows by the voltage supplied at t6 (t9).

  FIG. 40A shows the state of the current generated when the minute period is set to 60 milliseconds. The starting current Ph2 disappears after the minute period of 60 milliseconds has elapsed. Therefore, the maximum current value is 600 mA, and the current flows by 200 mA less than the case where the counter electromotive current is superimposed in the conventional device. It could be confirmed. In the same measurement experiment in which the minute period is set to 30 milliseconds, as shown in FIG. 40B, the counter electromotive current is superimposed and the starting current becomes 600 mA or more. In the same measurement experiment in which the minute period is set to 80 milliseconds, as shown in FIG. 40C, unnecessary time that elapses after the back electromotive current disappears becomes longer. Therefore, it was confirmed that it was appropriate to set the minute period to 60 milliseconds in the apparatus that was the subject of the experiment. However, this value varies depending on the load applied to the loading motor, so it is an appropriate value in the measurement experiment for each model. It is desirable to define

  As described above, according to the disk device of the present invention, the disk can be reliably clamped by substantially three clamping operations. During this time, the counter electromotive current is applied to the loading motor for operating the clamp head rapidly. Since no more current than necessary was superimposed, the durability of this loading motor could be improved, and no failure was confirmed even after an average of 50,000 or more repeated operations.

It is a perspective view which shows the external appearance of the disc apparatus which implemented this invention. FIG. 2 is a plan view showing an internal structure of the disk device of FIG. 1. It is a perspective view which shows the internal structure of the disc apparatus of FIG. It is a figure which shows the internal structure in the bottom face of the disc apparatus of FIG. It is a figure explaining the operation state of the disk apparatus of FIG. It is a figure explaining the operation state of the disk apparatus of FIG. 4 is an exploded perspective view for explaining the configuration of a drive mechanism C. FIG. It is a figure explaining a loading gear unit. It is a figure explaining the operation state of a loading gear unit. It is a perspective view which shows the structure of a rack gear unit. It is a figure which shows the 1st process of operation | movement of a raising / lowering mechanism. It is a figure which shows the 2nd process of operation | movement of a raising / lowering mechanism. It is a figure which shows the 3rd process of operation | movement of a raising / lowering mechanism. It is a figure which shows the 4th retreat of operation | movement of a raising / lowering mechanism. It is a figure which shows the 5th process of operation | movement of a raising / lowering mechanism. It is a figure which shows the 6th process of operation | movement of a raising / lowering mechanism. It is a figure which shows the 7th process of operation | movement of a raising / lowering mechanism. It is a figure which shows the outward process in the raising / lowering operation | movement of a clamp head. It is a figure which shows the return path process in the raising / lowering operation | movement of a clamp head. It is a disassembled perspective view which shows the structure of the action | operation mechanism of an attracting arm. It is a figure which shows the 1st process of operation | movement of an attracting arm. It is a figure which shows the 2nd process of operation | movement of an attracting arm. It is a figure which shows the 3rd process of operation | movement of an attracting arm. It is a figure which shows the 4th process of operation | movement of an attracting arm. It is a figure which shows the 5th process of operation | movement of an attracting arm. It is a figure which shows the 1st process of the carrying-in state of a disk. It is a figure which shows the 2nd process of the carrying-in state of a disk. It is a figure which shows the 3rd process of the carrying-in state of a disk. It is a figure which shows the 4th process of the carrying-in state of a disk. It is a figure which shows the 5th process of the carrying-in state of a disk. It is a figure which shows the 1st process of the operation state of a disk support arm. It is a figure which shows the 2nd process of the operation state of a disk support arm. It is a figure which shows the 3rd process of the operation state of a disk support arm. It is a figure which shows the 4th process of the operation state of a disk support arm. It is a figure which shows the 5th process of the operation state of a disk support arm. It is a figure which shows the 6th process of the operation state of a disk support arm. It is a figure explaining the operation state at the time of carrying out of a disk support arm. It is a figure explaining the function of a disk support arm. It is a figure explaining the operation | movement aspect of this invention. It is a figure explaining the aspect of the electric current which flows into a loading motor. It is a figure explaining the function of the conventional disc apparatus. It is a figure explaining the function of the conventional disc apparatus. It is a figure explaining the form of the center hole of a disc. It is a figure explaining the operation | movement aspect of the conventional disc apparatus. It is a figure explaining the malfunction in the conventional disc apparatus.

Explanation of symbols

1 .... Disk device 2 .... Chassis case 3 .... Bezel 4 .... Push button 5 .... Indicator 6 .... Base Panel 7 ... Clamp head 8 Frame member 9 Buffer support structure 10 Turntable 11 Spindle motor 12 ... -Optical pickup 13-Carrier block 14-Guide shaft 15-Guide shaft 16-Thread motor 17-Disc support arm 18- Holder 19... Support plate 20... Pivot pin 21... First link arm 22... Tension coil spring 23. .... Rivet pin 25 ... Pivot pin 26 ... Lock lever 27 ... Torsion coil spring 28 ... Limit switch 29 ... Start pin 30 ... Loading motor 31 ... Worm gear 32 ... Double gear 33 ... Double gear 34 ... Double gear 35 ... Gear base 36 ... Holder 37 ... Pivot pin 38 ... Compression coil spring 39 ... Limit switch 40 ... Slider member 41 ... Pivot pin 42 ... Tension coil spring 43 ... Loading slider 44 ... Lever Arm 45 ... Gear member 46 ... Pressing pin 47 ... Double gear 48 ... Gear frame 49 ... Operating piece 50 ... Attracting arm 51... Slide member 52... Slide member 53 .. Follower pin 54... Elastic ring 55 a... Link member 55 b.・ Follow-up pin 56 ... Clamp release pin 57 ... Follow-up pin 58 ... Pivot pin 59 ... Pivot pin 60 ... Roller A ... ··· Disk drive mechanism B ··· Head unit C ··· Drive mechanism D ··· Disk Da ··· Center hole E ··· Transport mechanism

Claims (1)

A frame member provided with a disk drive mechanism comprising a turntable having a clamp head and a spindle motor is moved up and down so that the center of the disk can be clamped or released by the clamp head, and the disk A plurality of arms for moving the frame member up and down in a horizontal direction while supporting the disk on the frame member and a drive mechanism for moving the frame member up and down. In the disk device that is moved up and down several times to clamp the center hole of the disk,
A disk device characterized in that a minute period during which voltage supply is stopped is interposed at the time of transition in which the direction of voltage supplied to a loading motor that is a drive source of the frame member drive mechanism is reversed.

Images