JPH0620372A - Optical disk device - Google Patents

Abstract

PURPOSE:To properly control the driving torque of a loading motor without adding a new circuit to an optical disk device using an exchangeable optical disk housed in a cartridge as a recording medium. CONSTITUTION:This device comprises a cartridge loading/unloading mechanism 18 for loading an optical disk 10 housed in a cartridge 12 inserted from outside on the rotation axis 16 of a spindle motor 14 and unloading by taking the optical disk 10 out of the rotation axis 16 of the spindle motor 14 and ejecting the cartridge outside. Concerning the optical disk device which executes the loading operation for the cartridge loading/unloading mechanism 18 by rotating the loading motor 20 in one direction and the unloading operation for the cartridge loading/unloading mechanism 18 by rotating in the reverse direction, a torque controlling means 22 for adjusting a driving torque by turning on and off the driving current of the loading motor 20 in a short period is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This patent relates to an optical disk device using a replaceable optical disk housed in a cartridge as a recording medium, and particularly to a load motor for loading and unloading an optical disk housed in a cartridge. The present invention relates to an optical disk device that is controlled by the above.

The optical disk device has a very large storage capacity and is expected to be effectively used as a large-capacity storage device of a computer system, and at the same time, it is expected to be downsized. Among them, in a replaceable optical disk device, an optical disk housed in a cartridge is used as a recording medium. Loading and unloading when the cartridge is inserted into the optical disk device and unloading when removing the cartridge are automatically performed by the load motor. It is desired to properly control the driving torque.

[0003]

2. Description of the Related Art Conventionally, an optical disk used in an optical disk device in which a recording medium is rewritable is usually housed in a cartridge case. When this cartridge case is inserted into the optical disk device, the shutter of the cartridge case is opened by the shutter opening / closing mechanism in the device, and the chucking hub of the optical disk and the disk surface accessed by the optical head are exposed.

The chucking of the optical disk with respect to the rotary shaft of the spindle motor is performed by driving the loading mechanism by a load motor. By this loading operation, the optical disk is moved in the direction of the rotary shaft of the spindle motor, and finally the spindle is rotated. It is attracted and fixed by a magnet provided on the disk receiver of the shaft. Usually, in order to reduce the cost of the device, the load motor is driven in a forward direction by turning on / off a switching circuit known as a bridge driver capable of switching the direction of the drive current according to an instruction from the MPU. To perform the load operation, and the load motor is rotated in the opposite direction to perform the unload operation.

[0005]

By the way, in the control of the load motor for performing the loading operation and the unloading operation of the optical disc housed in the cartridge case in such a conventional optical disc device, the voltage applied to the load motor is Since it is fixed, the rotation speed of the motor depends on the torque of the motor.

Therefore, if a motor having a large torque is used, the loading operation and the unloading operation are accelerated, but the load on the loading mechanism is increased, and the life of the load motor is shortened. The life of the loading mechanism is a very important performance when the optical disk device is built as a deck in a jukebox or the like, or is used as a so-called stand-alone device. On the other hand, if a motor with a small torque is used, the life of the loading mechanism is extended, but the time required for loading and unloading operations is extended.

Usually, chucking of an optical disk is performed by a magnet, and when loading, the optical disk is attracted by the magnet, so a motor having a small torque may be used. On the other hand, at the time of unloading for ejecting the cartridge, the disk is peeled off from the magnet. Therefore, unless the motor has a large torque, the operation cannot be performed quickly, and if the torque is small, the optical disk cannot be unloaded.

Therefore, the voltage applied to the load motor is set to MP
If the torque can be reduced during loading and the torque can be increased during unloading so that it can be changed from the farm such as U, the operation can be quick and the life of the load mechanism can be extended. However, in order to be able to change the voltage applied to the motor from the firmware such as MPU, a voltage control circuit must be added, and the device becomes complicated and costly.

The present invention has been made in view of such conventional problems, and an object thereof is to provide an optical disk device capable of appropriately controlling the drive torque of a load motor without adding a new circuit. To aim. Another object of the present invention is to provide an optical disk device that adjusts a drive torque by turning on and off a drive current supplied to a load motor in a short cycle.

Another object of the present invention is to provide an optical disk device in which the load applied to the loading mechanism is minimized and the life is extended. Another object of the present invention is to provide an optical disk device that controls torque so that loading and unloading operations can be performed quickly. Another object of the present invention is to provide an optical disk device capable of changing the torque during loading and unloading.

Another object of the present invention is to provide an optical disk device in which the torque can be changed in a plurality of steps during loading or unloading. The present invention provides an optical disc device which performs duty control for changing the ratio of ON time and OFF time at a fixed cycle. Another object of the present invention is to provide an optical disk device in which duty control is performed to change the ratio of ON time and OFF time with an indefinite period.

[0012]

FIG. 1 illustrates the principle of the present invention. First, according to the present invention, the optical disc 10 housed in the cartridge 12 inserted from the outside is loaded on the rotary shaft 16 of the spindle motor 14, and the optical disc 10 is removed from the rotary shaft 16 of the spindle motor 14 to remove the cartridge. A cartridge attaching / detaching mechanism 18 for performing an unloading operation for ejecting to the outside is provided, and the loading / unloading operation of the cartridge attaching / detaching mechanism 18 is performed by rotating the load motor 20 in one direction, and the unloading operation of the cartridge attaching / detaching mechanism 18 is performed in the opposite direction. The optical disk device thus configured is targeted.

In the present invention for such an optical disk device, the torque control means 22 for adjusting the drive torque by turning on and off the drive current of the load motor 20 in a short cycle.
Is provided. This torque control means 22
M indicates the on time and off time of the motor drive current
The processing means 24 is composed of firmware such as PU, and the switching means 26 is configured to switch the current supplied to the load motor 20 based on the instruction of the on / off time of the processing means 24. The same hardware as the conventional device is required. , No new circuit is added.

The torque control means 22 adjusts the torque by pulse width modulation (PWM) control of the motor current. The torque of the load motor is low when loading and strong when unloading. In addition, it is desirable that the large torque is gradually changed at the time of loading so as to be gradually reduced.
This point is the same at the time of unloading, and the torque is increased at first and gradually changed so as to decrease gradually.

In the duty control, the duty ratio may be changed with a constant cycle, or the duty ratio may be changed with an indefinite cycle. Further, when the load operation or the unload operation ends abnormally, the drive torque of the load motor is forcibly increased to perform the load operation or the unload operation again.

[0016]

According to the optical disk device of the present invention having such a configuration, even if the voltage applied to the load motor is constant, the voltage applied to the motor can be applied by a short on / off time instruction from firmware such as MPU. Pulse width modulation (PW
M; Pulse Width Modulatio
n) If controlled, the torque of the load motor can be appropriately controlled only by changing the firmware without adding a new circuit.

[0017]

2 is a block diagram of an embodiment showing one embodiment of the present invention. In FIG. 2, reference numeral 10 denotes an optical disk, and in the following embodiments, an ISO-compliant 5-inch optical disk cartridge will be described as an example. The cartridge case 12 accommodating the optical disk 10 is loaded on the rotary shaft 16 of the spindle motor 14 by the loading mechanism 18 when it is inserted into the optical disk device. The loading mechanism 18 is driven by a load motor 20.

In the loading state shown in the drawing, the cartridge case 12 is attached to the optical head 28 with respect to the medium surface of the optical disk 10.
Writing, reading, and erasing can be performed with a laser beam from. The optical head 28 is a voice coil motor (hereinafter "V
It is driven in the radial direction of the optical disc 10 by a "CM" 30.

In addition to the load motor 20, the loading mechanism 18 is provided with a load sensor 32, an unload sensor 34, and a cartridge-in sensor 36. The load sensor 32 is driven by the load motor 20 to drive the loading mechanism 18 to bring the cartridge case 12 into the state shown in the drawing.
The detection signal is output when is loaded. The unload sensor 34 outputs a detection signal at the time of unloading when the cartridge case 12 is removed from the rotation shaft 16 of the spindle motor 14 via the loading mechanism 18 by the reverse drive of the load motor 20.

Further, the cartridge-in sensor 36 connects the cartridge case 12 to the rotary shaft 16 of the spindle motor 14.
When it is inserted into the position where it can be loaded, it operates and outputs a detection signal. The load motor 20 is driven by the load motor drive circuit 26. The load motor drive circuit 26 controls the drive current flowing through the load motor 20 in response to an ON / OFF signal from the duty control unit 24 as a torque control unit realized by the program control of the MPU 48. Further, a VCM drive circuit 38, a read / write circuit 40, a track servo circuit 42, a focus servo circuit 44, and a spindle motor drive circuit 46 are provided for the MPU 48.

The VCM drive circuit 38 drives the VCM 30 by the control signal from the MPU 48 to control the position of the optical head 28 with respect to the optical disc 10. The read / write circuit 40 supplies the read signal read from the optical disk 10 by the optical head 28 to the MPU 48, and controls the write beam by driving the laser diode of the optical head 28 based on the write signal from the MPU 48 to the medium 10. Write information.

The track servo circuit 42 is based on the track error signal obtained from the optical head 28 and is based on the optical disk 10.
The beam is controlled to follow the spiral track on the medium surface. Incidentally, in the spiral track, a kickback operation is performed to return to the original position for each rotation. The focus servo circuit 44 controls the focus of the objective lens provided in the optical head 28. Further, the spindle motor drive circuit 46 is activated upon completion of loading of the optical disc 10 housed in the cartridge case 12 onto the rotary shaft 16 to rotate the optical disc 10 at a constant speed.

FIG. 3 shows an example of the internal structure of the optical disk device of the present invention. In FIG. 3, a support frame 52 is provided in the device housing 50, and the spindle motor 14 is arranged on the support frame 52. Spindle motor 14
The optical disc 10 housed in the loaded cartridge case 12 is chucked by the loading operation with respect to the rotation axis of the.

In the loading state, the optical disc 10 is opened at the upper and lower positions corresponding to the optical head by the operation of the shutter, the external magnet 55 is positioned above this opening position, and the optical head movable part 28-1 is located at the lower side. Is located.
The optical head movable portion 28-1 is fixed to the right side of a box-shaped movable frame 54 having a hollowed inside. The coil of the VCM 30 is mounted on the left side of the movable frame 54. The movable frame 54 can move on the support frame 52 by rollers,
An inner peripheral stopper 56 is formed on the left side of the support frame 52,
An outer peripheral stopper 58 is formed on the right side.

An optical head fixing portion 28-2 is installed on the right side of the support frame 52. This optical head fixing part 2
A laser diode and its optical system are incorporated in the reference numeral 8-2, and the laser beam is emitted into and emitted from the optical head movable portion 28-1 supported by the movable frame 54. 4 is shown in FIG.
FIG. 6 is an explanatory view showing a movable frame 54 of FIG.

In FIG. 4, the movable frame 54 is a box-shaped member having a hollow inside, and the spindle motor 14 is arranged in this hollow portion. An entrance / exit window 64-is provided at one end of the movable frame.
The optical head moving unit 28-1 having the unit No. 1 is fixed, and the coil of the VCM 30 is provided on the opposite side. Further, an LED 60 is provided at the protruding position of the lower end of the movable frame 54, and a PSD 62, which is a one-dimensional optical sensor, is arranged at a fixed side position facing the LED 60. The LED 60 irradiates the PSD 62 with a light emission beam.
Generates a light reception output according to the position of the movable frame 54.

FIG. 5 shows the internal structure of FIG. 3 from the bottom side, and the movable frame 54 is movably mounted on a rail 66 on the support frame side by rollers 68. An optical head movable portion 28-1 is arranged on the left side of the movable frame 54 so as to face the optical head fixed portion 28-2, and the respective entrance / exit windows 64-1 and 64-2 are located at the moving position of the movable frame 54. Regardless, they always match each other.

A coil of the VCM 30 is arranged at the right end of the movable frame 54, and an external magnet 55 is provided above the coil. Further, the LED 60 is arranged on the movable frame 54,
The PSD 62 on the fixed side is irradiated with a light beam so that the position signal of the movable frame 54, that is, the optical head movable portion 28-1 can be detected. FIG. 6 is an explanatory view showing a chucking structure of the optical disc 10 housed in the cartridge case 12 with respect to the rotary shaft 16 of the spindle motor 14 of FIG.

In FIG. 6, the tip of the rotary shaft 16 of the spindle motor 14 forms a pointed center pin 75,
A bowl-shaped disc receiver 76 curved upward is fixed to the step portion of the rotary shaft 16, and the magnet 7 is inserted in the disc receiver 76.
I am wearing 8. On the other hand, the optical disk 10 housed in the cartridge case 12 has a shaft hole 70, and hubs 72 and 74 made of a magnetic metal material are fixed above and below the shaft hole 70. Therefore, the loading mechanism 18 shown in FIG.
Performs loading and unloading of the optical disc 10 with respect to the rotary shaft 16 of the spindle motor 14 shown in FIG.

FIG. 7 is a block diagram of an embodiment of the loading mechanism shown in FIG. In FIG. 7, the loading mechanism 1
8 is provided with a slider member 90 that is movable in the lateral direction, a rack gear 102 is formed at one corner on the right side of the slider member 90, and a load motor 20 in which a pinion gear 100 is meshed with the rack gear 102 is provided. There is. Further, guide grooves 92, 94 are formed on the side surface of the slider member 90, the guide grooves 92 being open to the upper side, then to the horizontal direction, to be slanted downward, and to be opened to the horizontal direction.

This guide groove is also formed on the side surface of the slider member 90 on the side where the rack gear 102 is formed.
Hooks 96 and 98 mounted on the lower portion of the housing 106 opened to the right are fitted into the guide grooves 92 and 94. These hooks 96 and 98 are rack gears 102
The formation side is also similarly provided. Further, a sensor pressing plate 104 is projected downward at the front right end of the slider member 90, a load sensor 32 is arranged on the right side of the sensor pressing plate 104, and an unload sensor 34 is arranged on the opposite side.

Further, the cartridge-in sensor 36 is mounted on the right end of the housing 106, and the detection pin of the cartridge-in sensor 36 projects inside the housing 106. The cartridge case 12 can be housed in the housing 106 from the opening on the right side as shown by the broken line. In the housed state, the shutter of the cartridge case 12 which will be described later is opened to open the inner optical disk surface. Is exposed.

The loading mechanism 18 loads the optical disk 10 by rotating the load motor 20 so that the slider member 90 moves in the direction of arrow 150. That is, when the pinion gear 100 is rotated by the load motor 20 and the slider member 90 is moved by the rack gear 102 in the right direction indicated by the arrow 150,
Initially, the hooks 96 and 98 of the housing 106 located at the upper opening portions of the upper guide grooves 92 and 94 are moved to the right of the slider member 90, so that the hooks 96 and 98 of the guide groove 90 are maintained. It is pushed down along the diagonal.

As a result, the lower shaft hole of the optical disk 10 is fitted into the rotation shaft of the spindle motor 14 and chucked by attraction by the magnet, and the loading operation is completed. On the other hand, the unload operation is performed by the load motor 2
0 is performed by rotating the slider member 90 so as to move it in the opposite direction indicated by the arrow 160. When the slider member 90 is moved leftward as shown by the arrow 160 from the loading position shown in the drawing, the hooks 96 and 98 are pushed upward along the guide grooves 92 and 94 and chucked by the rotary shaft of the spindle motor 14. The optical disc 10 is removed.

The position of the slider member 90 in the loading operation and the unloading operation is detected by the load sensor 32 and the unload sensor 34, respectively, and the load motor 20 is stopped. FIG. 8 is an explanatory diagram showing an ISO-compliant 5-inch disk cartridge used in the embodiment of FIG.

In FIG. 8, the optical disk 10 is housed inside the cartridge case 12 as indicated by the broken line. A shutter 80 is slidably mounted on the surface of the cartridge case 12 by a shutter pressing plate 82, and an opening 86 is formed in the shutter 80.
Further, the shutter 80 is provided with a notch 84 for the opening operation when it is stored in the optical disk device.

FIG. 9 shows the operation of inserting the cartridge case 12 of FIG. 8 into the housing 106 of the optical disk device, and FIG. 10 shows the state of being completely inserted.
First, as shown in FIG. 9, when the cartridge case 12 is put in the housing 106, the pin 112 at the tip of the arm 108 rotatably mounted in the housing 106 by the rotary shaft 110 is provided with the shutter provided in the cartridge case 12. The notch 84 of 80 is fitted. The arm 108
Is held at the initial position by the arm return spring 114.

The pin 112 of the arm 108 shown in FIG.
When the cartridge case 12 is further pushed in with the notch engaged with the notch 84 of the shutter 80, the arm 108 is tilted to slide the shutter 80 to the left along the shutter pressing plate 82 as shown in FIG. The shutter 80 is removed from the position, and the medium surface of the optical disc 10 and the hub 72 are exposed through the opening 86.

The cartridge case 12 shown in FIG.
When the insertion of the cartridge is completed, the cartridge-in sensor 3
When the pin 6 is pushed in and the built-in switch contact turns on, the detection signal from the cartridge-in sensor 36 is received,
The loading mechanism 18 loads the optical disc 10 by starting the load motor 20 shown in FIG.

FIG. 11 shows an embodiment circuit diagram of the load motor drive circuit 26 shown in the embodiment of FIG. In FIG. 11, the load motor drive circuit 26 includes an AND gate 114,
116, 118, 120, drivers 122, 124, 1
26, 128, FETs 130, 132, 134, 13
6, a resistor 138, a pull-up resistor 140, and an inverter 142.

Among them, the circuit section 144 shown by the broken line is, for example, an ordering No. manufactured by SGS-THOMSON. You can use the "DMOS full bridge driver" that can be purchased with the L6201. A power supply voltage + Vcc is applied to the load motor drive circuit 26, and at the same time, an on / off signal E for torque control of the load motor 20 is applied by a duty control unit 24 provided in the MPU 48.
₁₀ is given.

When the signal E ₁₀ is at H level, AND
The outputs of the gates 114 and 120 become H level, the outputs of the AND gates 116 and 118 become L level, and the driver 12
FETs 130 and 136 are turned on through 2,128, while FETs 134 and 132 are turned off. Therefore, the current to the load motor 20 flows from the FETs 130 to 136 as shown by the solid line arrow, and the load operation is performed in this state.

When the signal E _{0 is set} to L level, AND
The gates 118 and 116 generate an H level output, and at the same time A
The ND gates 114 and 120 generate an L level output,
T134 and 132 are turned on, FETs 130 and 136 are turned off, and the load motor 20 is changed from FET134 to FET.
A current flows in the direction indicated by the broken arrow so as to be 132, and the load motor 20 is rotated in the reverse direction so that the unload operation can be performed. The FETs 130, 132, 13
A diode for absorbing surge is connected in parallel to each of 4, 136.

Next, torque control of the load motor 20 by the duty control unit 24 of FIG. 2 will be described with reference to the flowcharts of FIGS. 12 and 13. The flowchart of FIG. 12 shows a loading process when the optical disk device is incorporated in a jukebox or the like and used as a stand-alone device, and FIG. 13 shows an unloading process at that time.

The load process of FIG. 12 is characterized in that torque control is performed so as to reduce the drive torque of the load motor as compared with the unload process. In order to reduce the driving torque of the load motor 20 during this loading,
In the RAM of the MPU 48, the duty control unit 24 is turned on,
The duty on time T _ON and the duty off time T _OFF used for the off control are stored in advance.

In FIG. 12, first, in step S1, it is monitored whether or not the cartridge is inserted. Specifically, it monitors whether or not the cartridge-in sensor 36 is turned on. When it is determined that the cartridge is inserted, step S2
Then, the duty-on time T _ON and the duty-off time T _OFF are read from the ROM and loaded into the RAM.

Then, in step S3, the voltage polarity is determined so that the load motor 20 is driven in the loading direction, and the load motor 20 is turned on.
Wait only for _ON . When the on-time T _ON has passed, the drive of the load motor 20 is turned off in step S5, and the next off-time T _OFF of the RAM is waited in step S6. Step S3 above
Each time the processing from S6 to S6 is performed, the load sensor 3
It is monitored whether or not No. 2 is turned on, and the on-driving of the load motor for the T _ON time and the off-driving for the T _OFF time are repeated until the load sensor 32 is turned on. As a result, the load motor 20 is subjected to PWM control with the duty ratio of T _ON / (T _ON + T _OFF ), and is driven by a ratio determined by the duty ratio as compared with the case where the load motor 20 is continuously on-driven. Since the current drops on average,
The driving torque can be reduced.

When the load sensor 32 is turned on and it is determined that the loading is completed by the unloading operation in which the driving torque is reduced, the controller is notified of the completion of the loading operation in step S8, and the series of processes is completed. After that, the reading / writing process for the loaded optical disc is started. FIG. 13 shows an unload process for ejecting the cartridge after performing the load operation shown in FIG.

In this unloading process, it is first monitored in step S1 whether or not an unload command is issued from the controller. When the unload command is issued, the load motor 20 is turned on in step S2. To do. Since the unload operation is performed with a large driving torque, the load motor 20 is continuously turned on. Subsequently, in step S3, it is monitored whether or not the unload sensor 34 is turned on.
Is turned on, the drive of the load motor 20 is turned off in step S4, and the controller is notified of the end of the unload operation in step S5 to mechanically eject the optical disk cartridge.

FIG. 14 is a flow chart showing another embodiment of torque control of the load motor 20 by the duty control unit 24 of FIG. 2. In this embodiment, the optical disk device is a library for a host device such as a computer main body. The load processing when used as a device is shown. Furthermore, FIG.
Shows another embodiment of the unloading process when it is also used as a library device. In this unloading process, a large flow torque is required when the optical disk in the attracted state is removed by the magnet. Therefore, in the unloading process, the load motor 20 is driven so that a large torque is initially generated, and then the driving torque is reduced to drive the load motor 20.

First, the load process as the library device of FIG. 4 is basically the same as the load process when used in the stand-alone device shown in FIG. 12, and the end of the load operation is completed in the final step S8. The other points are the same except that the higher-level device is notified. That is, even in the loading process as the library device, P is achieved by repeating ON driving and OFF driving of the load motor 20 at short time intervals.
The drive torque is reduced by the WM control.

Next, the unload process for gradually reducing the drive torque in FIG. 15 will be described. The 15 to perform the unloading process, first, the duty on period for driving a large torque and a small torque is MPU48 of ROM of T _ON1, T _ON2 and duty off time T _OFF1, T _OFF2 Figure 2 in advance It is stored. Here, on, is set to the T _ON1> T _ON2 T _OFF1 a <T _OFF2 relationship with constant period T OFF time.

Further, C ₁ is previously registered as a counter value for discriminating the value of the timer counter C for switching the torque. In FIG. 15, first, in step S1, it is monitored whether or not an unload command is issued from a higher-level device, and when the unload command is issued, step S2 is performed.
To proceed, the duty on-time T from ROM _ON1, T _ON2
The duty-off times T _{OF F1} and T _OFF2 and the torque switching counter value C ₁ are read and loaded into the RAM.

Subsequently, in step S3, the torque switching counter C for detecting the torque switching timing is cleared to C = 0. Next, in step S4, the load motor 20 is turned on, and in step S5, the on-time T _ON1 for determining the drive torque of the first stage is waited for.
_Is turned off, and the off time T _{OFF1 is} awaited in step S7. When the load motor 20 is turned on and off, the value of the torque switching counter C is incremented by 1 in step S8, and it is determined in step S9 whether the torque switching counter value C ₁ is reached.

Until the value of the torque switching counter C reaches the torque switching counter value C ₁ , T according to steps S4 to S8.
On of the load motor 20 over the _ON1 hours and T _OFF1 hours,
Repeat off. Torque switching counter C in step S9
When it reaches C _1, it is judged that it is the torque switching timing.
It progresses to S10 of 6. In step S10, the load motor 20 is driven on, and in step S11, the on-time T _{ON2 is} waited for the second-stage torque drive.
After the drive of the load motor is switched off in step 12, the off time T _{OFF2 is} waited in step S13, and then in step S14.
Then, it is checked whether the unload sensor 34 is turned on.

The on / off control for obtaining the driving torque of the second stage of the load motor 20 in S10 to S13, that is, a small driving torque, is repeated, and when the unload sensor 34 is turned on, the process proceeds to step S15. Notify the upper device of the end of the load operation. 12 and 1
Although 3 is an example of load processing and unload processing in a stand-alone device, it can be similarly applied to a library device. This point can be similarly applied to the stand-alone device for the unload process in the case of the library device of FIGS. 15 and 16.

Regarding the duty control for alternately controlling the load motor 20 with a short on-time and off-time in the above embodiment, the duty control for changing the on-time and the off-time with a constant cycle, or the on-time with an indefinite cycle. Alternatively, duty control for changing the off time may be used. Further, in the above-described embodiment, as shown in the flow charts of FIGS. 15 and 16, the drive torque is first increased only during the unload operation, and the drive torque is reduced when the optical disk is removed from the attraction of the magnet. However, the drive torque may be increased first to bring the optical disk closer to the magnet for the load operation, and the drive torque may be decreased when the attraction force of the magnet comes out next.

Further, by torque control during loading, for example, when the load operation fails and ends abnormally, it is determined that the drive torque is insufficient, and the duty control is performed again so that the drive torque of the load motor is increased compared to the previous time, and the load torque is again set. Perform load operation. The retry due to the increase in the drive torque of the unload motor when the load operation fails and ends abnormally is also performed when the unload operation fails and the unload operation ends abnormally. You may make it retry by increasing torque.

[0059]

As described above, according to the present invention, it is possible to optimize the load and unload conditions simply by changing the control of the load motor by firmware such as MPU without adding new hardware. Torque control can be performed, prompt loading and unloading can be performed without increasing the cost, the life of the loading mechanism can be extended, and the current consumption as a whole can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of the internal structure of the optical disk device of the present invention.

FIG. 4 is an explanatory view showing the movable frame of FIG. 3 taken out and shown from below.

5 is a bottom view of FIG.

6 is an explanatory diagram of a chucking structure of the optical disc of FIG.

FIG. 7 is an explanatory view of the loading mechanism of FIG.

FIG. 8 is an explanatory diagram of an optical disk cartridge used in the present invention.

FIG. 9 is an explanatory diagram showing an internal state at the start of cartridge insertion.

FIG. 10 is an explanatory view showing an internal state when the insertion of the cartridge is completed.

11 is a circuit diagram of an embodiment of the load motor drive circuit of FIG.

FIG. 12 is a flowchart showing a load process when used in a stand-alone device.

FIG. 13 is a flowchart showing an unload process when used in a stand-alone device.

FIG. 14 is a flowchart showing a loading process when used in a library device.

FIG. 15 is a flowchart showing unload processing when used in a library device.

FIG. 16 is a flowchart showing unload processing when used in a library device (continued)

[Explanation of Codes] 10: Optical Disc (Recording Medium) 12: Cartridge (Cartridge Case) 14: Spindle Motor 16: Rotation Shaft 18: Cartridge Attachment / Detachment Mechanism (Loading Mechanism) 20: Load Motor 22: Torque Control Unit 24: Processing Means Duty control section) 26: Switching means (load motor drive circuit) 28: Optical head 28-1: Optical head movable section 28-2: Optical head fixed section 30: Voice coil motor (VCM) 32: Load sensor 34: Unload Sensor 36: Cartridge-in sensor 38: VCM drive circuit 40: Read / write circuit 42: Track servo circuit 44: Focus servo circuit 46: Spindle motor drive circuit 48: MPU 50: Device case 52: Support frame 54: Movable frame 56 : Inner circumference stopper 58: Outside Stopper 60: LED 62: PSD 64-1, 64-2: Input / output window 65: Door 66: Rail 68: Roller 70: Shaft hole 72, 74: Hub 76: Disk receiver 78: Magnet 80: Shutter 82: Shutter presser Plate 84: Notch 86: Opening 90: Slider member 92, 94: Guide groove 96, 98: Hook 100: Pinion gear 102: Rack gear 104: Sensor pressing plate 106: Housing 108: Arm 110: Rotating shaft 112: Pin 114, 116, 118, 120: AND gate 122, 124, 126, 128: Driver 130, 1321, 134, 136: FET 138: Resistor 140: Pull-up resistor 142: Inverter 144: Circuit part

Claims (14)

[Claims] 1. A spindle motor (14) for rotating an optical disk (10) housed in a cartridge (12) and an optical disk (10) housed in the cartridge (12) inserted from the outside for the spindle motor (14). 1
4) A cartridge attaching / detaching mechanism for performing a loading operation for mounting on the rotating shaft (16) and an unloading operation for removing the optical disk (10) from the rotating shaft of the spindle motor (14) and ejecting the cartridge (12) to the outside. (18)
And the cartridge attaching / detaching mechanism (18) by rotating in one direction
And a load motor (20) for unloading the cartridge attaching / detaching mechanism (18) by rotating in the opposite direction, and a drive current of the load motor (20) is turned on in a short cycle,
Torque control means (22) for turning off and adjusting drive torque
An optical disk device comprising: 2. The optical disk device according to claim 1, wherein
The torque control means (22) is a processing means (24) for instructing on-time and off-time of the motor drive current, and the load motor (20) based on the on-time and off-time instructed by the processing means (24). ), And a switching means (26) for switching the current supplied to the optical disk device. 3. The optical disk device according to claim 1, wherein
The torque control means (22) controls the on-time and off-time of the motor current so as to change the drive torque of the load motor (20) during the loading operation and the unloading operation of the cartridge attaching / detaching mechanism (18). An optical disk device characterized in that. 4. The optical disk device according to claim 1, wherein
The torque control means (22) controls the on-time and off-time of the motor current so that the drive torque of the load motor (20) during the loading operation of the cartridge attaching / detaching mechanism (18) becomes smaller than that during the unloading operation. An optical disk device characterized in that. 5. The optical disk device according to claim 1, wherein
The torque control means (22) controls ON / OFF of the electric current supplied to the load motor (20) during the load operation of the cartridge attaching / detaching mechanism (18), and supplies the electric current to the load motor (20) during the unload operation. An optical disk device characterized by continuously turning on. 6. The optical disk device according to claim 1, wherein
The torque control means (22) is configured to load the load motor (2) when the cartridge loading / unloading mechanism (18) is loaded.
An optical disk device characterized in that the drive torque of 0) is changed in a plurality of steps. 7. The optical disk device according to claim 6, wherein
The torque control means (22) is configured to load the load motor (2) when the cartridge loading / unloading mechanism (18) is loaded.
An optical disk device characterized in that the drive torque of 0) is initially set to a large state and then gradually changed so as to be reduced. 8. The optical disk device according to claim 7, wherein
The torque control means (22) is configured to load the load motor (2) when the cartridge loading / unloading mechanism (18) is loaded.
0) The on-time and off-time of the current supplied to 0) are controlled such that the on-time is first increased and then the on-time is decreased stepwise. 9. The optical disk device according to claim 1, wherein
The optical disk device, wherein the torque control means (22) changes the drive torque of the load motor (20) in a plurality of steps when the cartridge loading / unloading mechanism (18) is unloaded. 10. The optical disk device according to claim 9, wherein the torque control means (22) initially increases the drive torque of the load motor (20) during the unloading operation of the cartridge attaching / detaching mechanism (18). An optical disk device characterized by being kept in a state and then being gradually changed so as to become smaller. 11. The optical disk device according to claim 10, wherein the torque control means (22) turns on a current supplied to the load motor (20) during a loading operation of the cartridge attaching / detaching mechanism (18). The optical disc device is characterized by controlling the ON time to be longer first and then the ON time to be gradually reduced. 12. The optical disk device according to claim 1, wherein the torque control means (22) controls the on / off of the drive current of the torque motor (20) to control the torque so that the on time and the off time are constant. An optical disk device characterized in that the duty ratio is changed by changing the time. 13. The optical disk device according to claim 1, wherein the torque control means (22) controls the on / off of the drive current of the torque motor (20) to control the torque, and the on time and the off time are indefinite. An optical disk device characterized in that the duty ratio is changed by changing the time. 14. The optical disk device according to claim 1, wherein the torque control means (22) increases the drive torque of the load motor (20) when the load operation or the unload operation ends abnormally. An optical disk device characterized by performing a loading operation or an unloading operation again.