JPH0991815A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a motor for obtaining motive power to release the clamp of a disk, to make an entire device small in size and light in weight and to reduce the power consumption. SOLUTION: When a command for releasing the clamp of the disk is issued, a motor control signal S3 is outputted from a controller 86 to a motor driving circuit 89. Simultaneously, driving voltage S4 is applied to an assist circuit 85 for a fixed time (an instant to separate a turntable from a clamper), so that assist voltage to make torque high is impressed on the motor 23. The driving voltage impressed on the motor 23 at the time of releasing the clamp of the disk is instantaneously made high, so that the motor 23 instantaneously generates the high torque to separate the turntable from the clamper against magnetic attracting force, and then the clamp is surely released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing device such as a CD-ROM drive.

[0002]

2. Description of the Related Art In recent years, a CD built into a computer
Development of a disk reproducing device such as a ROM drive has been actively conducted. As a typical example of this kind of disc reproducing apparatus, a tray containing an optical disc is mounted in a horizontal direction (direction of the disc surface) from a cabinet containing an optical pickup, a mechanism for driving the disc (a disc motor, a turntable) and the like. ), There is a type of disc reproducing device that can be loaded and unloaded (loading / unloading). Further, some disk reproducing apparatuses of this type include a pickup unit (a unit in which an optical pickup and a disk drive mechanism are integrally mounted) that moves up and down simultaneously with the loading and unloading of a tray.

In this disc reproducing apparatus having a pickup unit capable of moving up and down, when the pickup unit is raised by the power of the motor, the disc is lifted from the tray by the turntable and the disc is placed above the turntable and the tray. It will be clamped with the clamper on standby. A magnet is attached to the turntable or the clamper, and the two are coupled by the magnetic force of the magnet with the disc interposed.

When the disk is taken out (ejected), the pickup unit is first moved in a direction away from the clamper by rotating the motor in a direction opposite to that at the time of loading. This pulls the turntable away from the clamper (unclamps the disc) and returns the disc to the tray. On the other hand, the power of the motor is also transmitted to the tray loading mechanism, and the tray loaded with the disc is ejected from the cabinet by this loading mechanism.

FIG. 18 shows the configuration of the control system of this motor. When the controller 101 inputs a disc eject command from the host CPU 102 or an ON signal of an eject switch 103 provided in the optical disc reproducing apparatus, the controller 101 outputs a motor control signal to a motor drive circuit 104. The motor control signal is amplified by the motor drive circuit 104 and becomes the motor drive voltage V1 of a predetermined level as shown in FIG. 19, and the motor 105 is in the period from t0 to t1.
Is applied to

By the way, in recent years, as the transfer rate has been increased in reproducing a disc such as a CD-ROM, a strong magnetic coercive force is required due to the disc clamping structure. For example, recently, as a device for reproducing a disc (CLV disc) in which an information signal is recorded at a constant linear velocity, a device capable of reproducing at 6 times speed has appeared. In the case of this playback device, the range of disc rotation speed during standard playback is
If the speed is 200 to 530 rpm, the range of the disk rotation speed during 6 × speed reproduction is 1200 to 3180 rpm, and the disk is rotationally driven at a considerable speed. When the rotational speed of the disk increases, even a slight warp of the disk causes a large buoyancy force due to air resistance, which may even make it impossible to maintain a stable clamped state of the disk. For this reason, the magnetic force of the disc clamp structure tends to increase.

However, if the magnetic force of the disc clamp structure is increased, a correspondingly large force is required to release the clamp. As a countermeasure, there are methods such as using a large motor with high output and increasing the reduction ratio of gears and cams for transmitting power of the motor. However, increasing the size of the motor hinders the reduction in size and weight of the device and increases power consumption. Further, if the reduction ratio of the gear or the cam is increased, the operation speed of the disc clamp release mechanism and the tray loading mechanism is reduced, and the eject operation time is increased.

[0008]

As described above, if the magnetic force in the disc clamp structure is increased, a large force is required to release the clamp, and it is required to use a large motor with high output or to eject. There is a problem that it causes an increase in operating time.

The present invention is intended to solve such a problem, and the disc can be surely unclamped without using a high-power large motor, thereby reducing the size and weight of the entire apparatus. It is an object of the present invention to provide a disc reproducing apparatus which can reduce power consumption and cost.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a disk drive mechanism including a turntable for mounting and driving a disk, and a disk for clamping the disk between the turntable. A clamper member, which is magnetically coupled to a turntable via a disc, and a clamp release mechanism for releasing at least one of the disc drive mechanism and the clamper member in a direction in which they are separated from each other to release the clamp of the disc. When,
When a predetermined command is given to the motor for driving the unclamping mechanism, a first torque for unclamping is instantaneously generated in the motor for a predetermined time, and after a predetermined time,
And a motor control means for controlling the electric power supplied to the motor so as to generate a second torque smaller than the first torque. Further, the present invention relates to a disk drive mechanism including a turntable for mounting and driving a disk, and a clamper member for clamping the disk between the turntable and magnetic coupling with the turntable via the disk. A clamper member, a clamp release mechanism for releasing at least one of the disc drive mechanism and the clamper member in a direction away from each other, and a disc released by the clamp release mechanism or this disc. A disc ejecting mechanism for ejecting the loaded tray from the main body of the device, a motor for driving both the clamp releasing mechanism and the disc ejecting mechanism, and for releasing the clamp of the motor for a prescribed time when a prescribed command is given. Instantaneously generate the first torque of the Characterized by comprising a motor control means for controlling the power supplied to the motor so as to generate a smaller second torque Ri.

In the present invention, in response to the generation of the command for unclamping the disc, the motor control means sets the motor to a high first for unclamping for a predetermined time.
By supplying high drive power to the motor so as to instantaneously generate the above torque, it is not necessary to use a large motor with high output that can obtain the high torque required for unclamping the disk at the rated power. The turntable and the clamper member, which are coupled to each other with a strong magnetic force, can be reliably separated.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of an optical disk reproducing apparatus according to the present invention.

In FIG. 1, 1 is a cabinet and 2 is a front panel. The front panel 2 has an opening 3 for loading and unloading a tray 10 having an optical disk, an eject switch 4 for giving an electrical command for ejecting the tray 10, and a small hole 5 (the tray 10 due to a failure).
A small hole 5) for inserting a wire or the like is provided for the purpose of manually forcibly ejecting the tray when the automatic ejection of is impossible. 2, FIG. 3, and FIG.
Reference numeral 20 is a frame made of mold resin. Reference numeral 30 denotes a pickup unit (hereinafter referred to as PU unit). 40 and 41 are trays 10 and P in the frame 20.
A pair of sliders for supporting the U unit 30 and guiding the movement thereof.

The details of each unit will be described below.

The frame 20 includes slider support portions 21 and 21 for slidably supporting the sliders 40 and 41 in the direction of arrow XX ', and a motor mounting portion 22 (for loading a disc or unclamping a disc). A motor mounting base 22 to which a motor 23 that is a power source for performing the above is attached, and a connecting member mounting portion 24 (each slider 4).
Connecting member 5 for synchronizing the sliding movement of 0 and 41
0 (see FIG. 6) attached to the connecting member attachment portion 24)
And a clamper mounting portion 25 (a clamper mounting portion 25 for rotatably holding the clamper 60).

The tray 10 includes a disc mounting portion 11 on which an optical disc (not shown) is mounted, and a disc mounting portion 11
It has a window 12 for exposing a part of the signal recording surface of the optical disk mounted on the disk. Further, slider engaging projections 13 and 13 are provided on both outer surfaces of the tray 10. The protrusions 13 and 13 are fitted in the guide grooves 42 and 42 (see FIG. 5) provided in the sliders 40 and 41, respectively. As a result, the tray 10 is supported on the sliders 40 and 41 so as to be movable in the arrow XX 'direction. A rack gear 14 is provided on the inner surface on one side of the tray 10. This rack gear 1
4 is connected to the loading motor 23 through a plurality of gears. In addition, a pinhole 15 for positioning is provided on the back surface of the disk mounting portion 11 of the tray 10. In this pinhole 15, the PU unit 30
By inserting the fixing pin 32 provided in
The tray 10 and the PU unit 30 are positioned and fixed to each other.

The PU unit 30 is an optical pickup 31 for reading an information signal from the signal recording surface of the optical disc.
A pickup feed mechanism 33 for feeding the optical pickup 31 in the radial direction of the optical disc, and a disc drive mechanism (a turntable and a disc motor 34 for rotating the optical disc while sandwiching the optical disc with the clamper 60). Disk drive mechanism consisting of
And a frame 35 for integrally supporting them and other printed wiring boards and the like. Frame 3
The fixing pin 32 described above is provided on the reference numeral 5. The sliders 4 are provided on both side surfaces of the frame 35, respectively.
Guide holes 43, 44, 45, 46 provided in 0, 41
(See FIG. 5), the guide pins 36a, 36b,
36c and 36d are provided.

As shown in FIG. 5, each slider 40, 41
Are respectively associated with the guide grooves 42, 42 (for supporting the tray 10 slidably in the direction of arrow XX 'in relation to the slider engaging protrusions 13, 13 provided on the outer side surfaces of both sides of the tray 10). Guide grooves 42, 42) and two guide holes 43, 44 and 45, 46.

Guide pins 36a, 36b and 36c, 36d provided on the frame 35 of the PU unit 30 are inserted into the guide holes 43, 44, 45, 46, respectively. Due to the engagement between the guide holes and the guide pins, the PU unit 30 moves up and down at the same time as the sliders 40 and 41 slide.

Rack gears 47 and 48 are provided at the lower ends of the sliders 40 and 41, respectively. Each rack gear 4
As shown in FIG. 6, the gears 7, 48 mesh with the gears 51, 52 fixed to both ends of the shaft 53 of the connecting member 50. The sliders 40 and 41 are connected to each other by the connecting member 50 and are configured to slide in synchronization with each other. A rack gear 49 is provided on one slider 41.

As shown in FIG. 7, the clamper mounting portion 25 includes an opening portion into which the clamper 60 is fitted and three claw portions 26, 26 and 26 for holding the clamper 60 fitted into the opening portion. Composed. Clamper 60
Is rotatably held between these three claw portions 26, 26, 26 and the pedestal 27. Each claw portion 26,
Tapered tip (when the clamper 60 is installed, the clamper 6
It is composed of a tip end portion for elastically deforming the claw portion 26 by receiving pressure from 0) and a clamper pressing surface (a clamper pressing surface for holding the clamper 60 from above so that the clamper 60 does not come off). The clamper 60 has a magnet (not shown) magnetically coupled to the metal embedded in the turntable 28.

As shown in FIG. 8, the disk drive mechanism is
A turntable 28, a disc motor 34 that drives the turntable 28, and a centering member 37 (a centering member that is mounted on the turntable 28 via a spring 29 to position the optical disc D at the center of the turntable 28. 37) and.

Next, in this optical disk reproducing apparatus,
The tray loading and the raising / lowering operation of the PU unit will be described.

FIGS. 9A and 10 show the state when the tray 10 is being discharged. As shown in these figures, when the tray is ejected, the guide pins 36a, 36b, 36c, 36d of the PU unit 30 are attached to the sliders 4 respectively.
Guide holes 43, 44, 45, 46 provided in 0, 41
It is on the horizontal part (a) in the upper row. At this time, the turntable 28 and the clamper 60 are separated. On the other hand, as shown in FIG. 10, the rack gear 14 provided on the tray 10
Is connected to the first gear (b) of the clutch gear 64.

The loading of the tray 10 is started by the user pushing the tray 10 in the direction of the arrow X'with a finger or the like. When the tray 10 has moved a certain distance, this is electrically detected by the switch 70 mounted on the frame 20, and the detection signal is notified to the controller. As a result, the controller controls the motor 23 to start. When the motor 23 is activated, the clutch gear 64 rotates in the direction of the arrow, whereby the tray 10 is automatically pulled in (loaded).

When the retracted amount of the tray 10 reaches a predetermined distance, as shown in FIG. 11, the end surface 10a of the tray 10 on the insertion side contacts the one end 81 of the rotary lever 80.
As shown in FIGS. 4 and 5, the rotating lever 80 is rotatably supported on the frame 20 via a support shaft 82. The rotary lever 80 has the other end portion 83 for pushing out one slider 40 to the front side (direction of arrow X). Therefore, one end 81 of the rotary lever 80 abuts on the insertion-side end surface 10a of the tray 10, and the rotary lever 80 rotates in the direction of arrow C, whereby the slider 40 slides toward the front side (direction of arrow X). To start. When the slider 40 moves, the slider 40 and the connecting member 5
The other slider 41 connected via 0 also slides in the arrow X direction in synchronization with the slider 40.

As shown in FIG. 12, in the tray 10, the end surfaces 16a and 16b of the tray 10 are the surfaces 20c of the frame 20.
The loading of the tray 10 is completed when the tray 10 is moved to the position where it abuts. At this time, as shown in FIG.
Each guide pin 36a, 36b, 36 of the PU unit 30
c and 36d are guide holes 43 and 4 of the sliders 40 and 41.
4, 45, 46 on the slope (b). That is, the PU unit 30 is located almost in the middle of its lifting range.

At this time, as shown in FIG.
The rack gear 49 of 0 is already connected to the gear 61. Therefore, the sliders 40 and 41 are moved in the arrow X direction by the power of the motor 23 transmitted through the clutch gear 64, the gear 61, and the rack gear 49. At this time, the clutch gear 64 disconnects the power of the motor 23 to the tray loading mechanism, and the sliders 40, 4
Power is transmitted only to the lifting mechanism of No. 1.

FIG. 13 shows a state where the movement of the sliders 40 and 41 is completed (state where the loading of the disk is completed).
Is shown. At this time, as shown in FIG.
Each guide pin 36a, 36b, 36c of the unit 30,
36d is the guide holes 43, 44 of the sliders 40, 41,
It is located in the lower horizontal part (c) of 45 and 46. At this time, the optical disc is clamped between the turntable 28 and the clamper 60. Further, at this time, the fixing pin 32 provided in the PU unit 30 is fitted into the pin hole 15 provided in the tray 10, so that the vertical direction of the tray 10 and the PU unit 30 and the front-rear, left-right direction. Positioning and mutual fixation are achieved. Tray 1
Ejection of 0 is started by pressing the eject switch 4. When the eject detection signal of the eject switch 4 is input, the controller controls the motor 23 so as to drive it in the reverse rotation direction to that at the time of loading. As a result, the PU unit 30 moves from the position (height) in FIG. 9C to the position (height) in FIG. 9B, and the disc is unclamped. After that, the tray is discharged by the procedure completely opposite to the loading operation described above. Tray 10
Is ejected into place, this event occurs in Frame 2
It is electrically detected by the switch 70 mounted at 0. The controller controls the motor 23 to stop when the detection signal from the switch 70 is input.

By the way, the turntable 28 is magnetically coupled to the clamper 60 with the disc interposed therebetween. Therefore,
The stronger the magnetic attachment force, the stronger the force required to separate the turntable 28 from the clamper 60 when the disc is unclamped. In order to meet this request, the optical disk reproducing apparatus is configured to control the electric power supplied to the motor 23 so as to generate a high torque in the motor 23 only at the moment when the turntable 28 is separated from the clamper 60.

FIG. 14 shows the structure of the motor control system. In the figure, reference numeral 85 is an assist circuit for increasing the voltage applied to the motor 23 for a certain period of time in order to instantaneously generate a high torque in the motor 23 as compared with the normal drive (rated voltage). The assist circuit 85 is based on a control signal S4 from the controller 86.
Transistor 87 for switching the ON / OFF state of the motor 23 and two second transistors 88a, 8a for applying an assist voltage for increasing the torque to the motor 23.
8b and several resistors.

As shown in FIGS. 14 and 15, the controller 86 outputs the motor control signal S3 to the motor drive circuit 89 when the disk eject command S1 from the host CPU 99 or the ON signal S2 of the eject switch 4 is input. To do. The motor control signal S3 is amplified by the motor drive circuit 89, and the motor drive voltage V1 of a predetermined level is obtained.
(For example, when the power supply voltage is 5V, it is about 3V) and is applied to the motor 23. At the same time when the output of the motor control signal S3 is started, the controller 86 applies a predetermined control voltage S4 to the base of the first transistor 87 to switch the assist circuit 85 to the ON state. This control voltage S4
Is the momentary time when the turntable 28 is separated from the clamper 60 (time from t0 to t1, for example, about 0.2 seconds).
Only added. As a result, each second transistor 88
Both a and 88b are turned on, an assist voltage for increasing the torque is applied to the motor 23,
Drive voltage of V2 increases to V2 (for example, about 4V).

In this way, when the disc clamp is released, the drive voltage applied to the motor 23 is instantaneously increased, so that the motor 23 is turned from the clamper 60 to the turntable 2 by the motor 23.
A high torque is momentarily generated to pull apart the magnet 8 against the magnetic force, so that the release of the clamp is surely achieved.

After t1, the assist voltage is turned off, and the drive voltage applied to the motor 23 returns to the rated value V1 given by the motor drive circuit 89. Then, at the timing t2 when the ejection of the tray 10 is detected, the motor 23
Is stopped.

As described above, in the optical disk reproducing apparatus of this embodiment, a high drive voltage is instantaneously applied to the motor 23 to generate a high torque only when the disk is unclamped. A reliable unclamping operation can be achieved without using a high-output large motor that can obtain the required high torque. Therefore, according to the optical disk reproducing apparatus, it is possible to reduce the size and weight of the entire apparatus by reducing the size of the motor, reduce the power consumption, and reduce the cost.

In the above embodiment, the controller 86 outputs the control signal S4 to the assist circuit 85,
Although the high drive voltage is instantaneously applied to the motor 23, as shown in FIG. 16, the one-shot pulse generator is generated from the first rise of the motor control signal S3 output from the controller 86 to the motor drive circuit 89. A pulse signal having a constant width may be generated at 90, and the pulse signal may be applied to the base of the first transistor 87 in the assist circuit 85 as the control voltage S4.

Further, as shown in FIG. 17, when the motor drive circuit 89 has sufficient drive capability (when the loss is small), a power limiting resistor 91 is interposed between the motor drive circuit 89 and the motor 23. Alternatively, the motor 23 may be configured to be driven at the rated power, and the assist circuit 85 may be replaced with the transistor for applying the assist voltage on the ground side.

The present invention is also applicable to a device for unclamping a disc by a dedicated motor and a device for lifting and lowering a PU unit by a dedicated motor (a device for loading a tray by using another motor). Is applicable to.

[0040]

As described above, according to the present invention, when a command for releasing the clamp of the disk is generated,
By supplying a high drive power to the motor so as to instantaneously generate a high first torque for unclamping the motor for a predetermined time, a high torque required for unclamping the disk at the rated power can be obtained. Even without using a large output motor, the turntable and the clamper member, which are coupled to each other with a strong magnetic force, can be reliably separated from each other. This makes it possible to reduce the size and weight of the entire apparatus, reduce power consumption, and reduce costs.

[Brief description of drawings]

FIG. 1 is a diagram showing an external appearance of an optical disk reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing the inside of the optical disc reproducing apparatus of FIG. 1 from the back side with the cabinet removed.

FIG. 3 is a diagram showing a state in which a tray of the optical disc reproducing apparatus of FIG. 1 is pulled out.

FIG. 4 is an exploded view of the optical disk reproducing device of FIG.

FIG. 5 is a diagram showing a connection relationship between a slider and a tray or a PU unit.

FIG. 6 is a view showing the optical disk reproducing device shown in FIG. 1 from the front side.

FIG. 7 is a diagram showing a configuration of a disc clamp mechanism.

FIG. 8 is an exploded view showing the configuration of a disk drive mechanism.

FIG. 9 is a side view showing a tray loading operation.

FIG. 10 is a plan view showing a state when the tray is discharged.

FIG. 11 is a plan view showing a state in which the tray is being pulled in.

FIG. 12 is a plan view showing a state at the end of retracting the tray.

FIG. 13 is a plan view showing a state of loading completion and disk clamp completion.

FIG. 14 is a diagram showing a configuration of a motor control system for instantaneously generating a high torque when the disc clamp is released.

15 is a diagram showing each waveform of a motor drive voltage and an assist circuit control voltage in the motor control system of FIG.

FIG. 16 is a diagram showing a configuration example of another motor control system according to the present invention.

FIG. 17 is a diagram showing a configuration example of still another motor control system according to the present invention.

FIG. 18 is a diagram showing a configuration of a conventional motor control system for releasing a disc clamp.

FIG. 19 is a diagram showing a motor drive voltage waveform in a conventional motor control system.

[Explanation of symbols]

 4 ... Eject switch 10 ... Tray 23 ... Motor 28 ... Turntable 60 ... Clamper 85 ... Assist circuit 86 ... Controller 89 ... Motor drive circuit

Claims (3)

[Claims] 1. A disk drive mechanism including a turntable for mounting and driving a disk, and a clamper member for clamping the disk between the turntable and the turntable, wherein the turn is provided via the disk. A clamper member magnetically coupled to the table, a clamp release mechanism for releasing at least one of the disc drive mechanism and the clamper member in a direction in which they are separated from each other, and a clamp release mechanism. And a motor for performing a predetermined command, and momentarily generating a first torque for unclamping the motor for a predetermined time,
A disc reproducing apparatus comprising: a motor control unit that controls electric power supplied to the motor so as to generate a second torque smaller than the first torque after the predetermined time. 2. A disk drive mechanism including a turntable for mounting and driving a disk, and a clamper member for clamping the disk between the turntable and the turntable via the disk. A clamper member magnetically coupled to the table, a clamp release mechanism for releasing at least one of the disc drive mechanism and the clamper member in a direction in which they are separated from each other, and a clamp release mechanism for clamping the disc. When a predetermined command is given, a disc ejection mechanism for ejecting the released disc or a tray on which the disc is placed from the main body of the apparatus, a motor for driving both the clamp release mechanism and the disc ejection mechanism, , A first torque for unclamping the motor for a predetermined time Momentarily to generate,
A disc reproducing apparatus comprising: a motor control unit that controls electric power supplied to the motor so as to generate a second torque smaller than the first torque after the predetermined time. 3. The disc reproducing apparatus according to claim 1 or 2, wherein the motor control means applies a drive voltage higher than a rating of the motor to the motor for a predetermined time when a predetermined command is given. A disk reproducing device characterized by the above.