JP2725749B2 - Optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus using a replaceable optical disk housed in a cartridge as a recording medium, and more 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 in a controlled manner.

An 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, 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 a cartridge is inserted into the optical disk device and unloading when removing the cartridge are automatically performed by the load motor.To ensure loading and unloading without overloading the optical disk, the load motor must be It is desired to appropriately control the driving torque.

[0003]

2. Description of the Related Art Conventionally, an optical disk used for an optical disk device capable of changing recording media 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 disk surface that is accessed by the optical disk chucking hub and the optical head is exposed.

The chucking of the optical disc with respect to the rotation axis of the spindle motor is performed by driving the loading mechanism with a load motor. By this loading operation, the optical disc is moved in the direction of the spindle motor rotation axis. It is attracted and fixed by a magnet provided on the shaft disk receiver. Normally, in order to reduce the cost of the device, the driving of the load motor is performed by turning on and off a switching circuit that can switch the direction of the driving current, known as a bridge driver, according to an instruction from the MPU. To perform the loading operation, and rotate the load motor in the reverse direction to perform the unloading operation.

[0005]

In controlling a load motor for loading and unloading an optical disk housed in a cartridge case in such a conventional optical disk 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.

For this reason, if a motor having a large torque is used, the loading operation and the unloading operation are quickened, 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 in a jukebox or the like as a deck or when it is used as a so-called stand-alone device. Conversely, if a motor with a small torque is used, the life of the loading mechanism is prolonged, but the time required for the loading operation and the unloading operation is prolonged.

Usually, the chucking of the optical disk is performed by a magnet, and the optical disk is attracted by the magnet at the time of loading. Therefore, 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, the operation cannot be performed quickly unless the motor has a large torque, and the optical disk cannot be unloaded if the torque is further reduced.

Therefore, the voltage applied to the load motor is expressed as MP
If the torque can be reduced during loading and the torque can be increased during unloading by changing from a firm such as U, the operation can be performed quickly 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 a firmware such as an MPU, a voltage control circuit must be added, and there is a problem that the device becomes complicated and costs increase.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and has as its object to provide an optical disk apparatus capable of appropriately controlling the driving torque of a load motor without adding a new circuit. It shall be the purpose.

[0010]

FIG . 1 shows the principle of the present invention.
FIG. First, the present invention relates to a cart inserted from outside.
The optical disk 10 housed in the ridge 12 is
When the load operation for mounting on the rotating shaft 16 of the
And an optical disc from the rotating shaft 16 of the spindle motor 14
10 and eject the cartridge to the outside.
With a cartridge attaching / detaching mechanism 18 for performing an unloading operation
I have.

The load motor 20 rotates in one direction.
The loading operation of the cartridge attaching / detaching mechanism 18 is performed by
Unloading of the cartridge attachment / detachment mechanism 18 by rotation in the reverse direction
The present invention is directed to an optical disk device that performs an operation.

The present invention relates to such an optical disk device.
In this case, the drive current of the load motor 20 is turned off in a short cycle.
Torque control means 22 for turning on and off to adjust the driving torque
Is provided.

The torque control means 22 includes a processing means 24 comprising firmware such as an MPU for instructing an on time and an off time of the motor drive current, and a load motor 20 based on the on / off time instructions of the processing means 24. It is composed of a switching means 26 for switching the current to be supplied, and requires only the same hardware as the conventional device, and does not add a new circuit.

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 small when loading and is strong when unloading. Also, at the time of loading, it is desirable to change the large torque gradually in a stepwise manner at first.
This point is the same at the time of unloading, and the torque is initially increased, and is gradually changed so as to gradually decrease.

In the duty control, the duty ratio may be changed with a fixed period, or the duty ratio may be changed with an indefinite period. Further, when the load operation or the unload operation ends abnormally, the drive torque of the load motor is forcibly increased and the load operation or the unload operation is performed again.

[0016]

According to the optical disk apparatus 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 reduced by a short on / off time instruction from firmware such as an 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]

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

The cartridge case 12 holds the optical head 28 against the medium surface of the optical disk 10 in the loading state shown in the figure.
Writing, reading, and erasing with a laser beam from The optical head 28 is a voice coil motor (hereinafter “V
The optical disk 10 is driven in the radial direction by the “CM” 30).

For the loading mechanism 18, a load sensor 32, an unload sensor 34, and a cartridge-in sensor 36 are provided in addition to the load motor 20. The load sensor 32 drives the loading mechanism 18 by the load motor 20 to bring the cartridge case 12
Outputs a detection signal 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 rotation 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.
It operates when it is inserted into the loadable position with respect to and outputs a detection signal. The load motor 20 is driven by a load motor drive circuit 26. The load motor drive circuit 26 receives an on / off signal from the duty control unit 24 as a torque control unit realized by program control of the MPU 48 and controls a drive current flowing to the load motor 20. Further, for the MPU 48, 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.

The VCM drive circuit 38 drives the VCM 30 according to a control signal from the MPU 48 to control the position of the optical head 28 with respect to the optical disk 10. The read / write circuit 40 supplies a 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 controls the optical disk 10 based on the track error signal obtained from the optical head 28.
The beam is controlled to follow a spiral track on the surface of the medium. In the spiral track, a kickback operation is performed to return to the original position every one rotation. The focus servo circuit 44 performs focus control of an objective lens provided on the optical head 28. Further, the spindle motor drive circuit 46 is started when the loading of the optical disk 10 stored in the cartridge case 12 onto the rotating shaft 16 is completed, and rotates the optical disk 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 disposed 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 disk 10 is opened at the upper and lower positions corresponding to the optical head by a shutter operation. The external magnet 55 is positioned above the opening position, and the optical head movable section 28-1 is positioned below the opening position. Is located.
The optical head movable section 28-1 is fixed to the right side of a box-shaped movable frame 54 whose inside is hollowed out. The VCM 30 coil is mounted on the left side of the movable frame 54. The movable frame 54 can be moved 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 at a position 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 8-2, and the laser beam enters and exits the optical head movable section 28-1 supported by the movable frame 54. FIG. 4 shows FIG.
FIG. 5 is an explanatory view showing a portion of the movable frame 54 taken out from the back side.

In FIG. 4, the movable frame 54 is a box-shaped member having a hollow inside, and the spindle motor 14 is disposed in this hollow portion. One end of the movable frame has an entrance / exit window 64-
1 is fixed, and the coil of the VCM 30 is provided on the opposite side. Further, an LED 60 is provided at a protruding position on the lower side end of the movable frame 54, and a PSD 62 which is a one-dimensional optical sensor is disposed at a position on the fixed side opposite to the LED 60. The LED 60 irradiates an emission beam onto the PSD 62,
Generates a light receiving output corresponding to the position of the movable frame 54.

FIG. 5 shows the internal structure of FIG. 3 from the bottom side. The movable frame 54 is movably mounted on rails 66 on the support frame side by rollers 68. On the left side of the movable frame 54, an optical head movable section 28-1 is disposed opposite to the optical head fixing section 28-2, and the respective entrance / emission windows 64-1 and 64-2 are moved to the moving position of the movable frame 54. Regardless, they always match.

A coil of the VCM 30 is disposed at the right end of the movable frame 54, and an external magnet 55 is provided above the coil. Further, an 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 section 28-1 can be detected. FIG. 6 is an explanatory view showing a chucking structure of the optical disk 10 housed in the cartridge case 12 with respect to the rotation shaft 16 of the spindle motor 14 in FIG.

In FIG. 6, the tip of the rotating shaft 16 of the spindle motor 14 forms a sharp center pin 75,
A bowl-shaped disk receiver 76 curved upward is fixed to the step of the rotating shaft 16, and the magnet 7 is placed in the disk receiver 76.
8 is attached. 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. For this reason, the loading mechanism 18 shown in FIG.
Performs loading and unloading of the optical disk 10 with respect to the rotating 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 which can be moved in the lateral direction. A rack gear 102 is formed at one corner on the right side of the slider member 90. I have. Further, on the side surface of the slider member 90, there are formed guide grooves 92 and 94 which are open upward, subsequently open laterally, descend obliquely, and further open laterally.

The 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 part 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
Are provided in the same manner. Further, a sensor holding plate 104 protrudes downward from the right end on the near side of the slider member 90. The load sensor 32 is arranged on the right side of the sensor holding plate 104, and the unload sensor 34 is arranged on the opposite side.

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

The loading of the optical disk 10 by the loading mechanism 18 is performed by rotating the load motor 20 so as to move the slider member 90 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 rightward as indicated by the arrow 150 by the rack gear 102,
At first, 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 rightward by the slider member 90 so that the hooks 96 and 98 of the guide member 90 are maintained at the positions. It is pushed down along the oblique part.

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 suction by a magnet, thereby completing the loading operation. 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 in the opposite direction indicated by the arrow 160. When the slider member 90 is moved leftward from the illustrated loading position as indicated by the arrow 160, the hooks 96, 98 are pushed upward along the guide grooves 92, 94, and are chucked by the rotating shaft of the spindle motor 14. The optical disk 10 is removed.

The position of the slider member 90 in such a loading operation and an 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 view 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 shown by a 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 has a notch 84 for an opening operation when the shutter 80 is stored in the optical disk device.

FIG. 9 shows the operation when the cartridge case 12 shown in FIG. 8 is inserted into the housing 106 of the optical disk drive, and FIG. 10 shows a state where the cartridge case 12 is completely inserted.
First, as shown in FIG. 9, when the cartridge case 12 is placed in the housing 106, a shutter 112 provided in the cartridge case 12 is attached to a pin 112 at the tip of an arm 108 rotatably mounted on the rotation shaft 110 in the housing 106. 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 while the cartridge case 12 is engaged with the notch 84 of the shutter 80, the arm 108 falls down as shown in FIG. The shutter 80 is removed from the position of, and the medium surface of the optical disk 10 and the hub 72 are exposed through the opening 86.

The cartridge case 12 shown in FIG.
When the insertion of the cartridge
When the pin No. 6 is pushed in, the built-in switch contact turns on, and receives the detection signal of the cartridge-in sensor 36,
The loading operation of the optical disc 10 by the loading mechanism 18 by the activation of the load motor 20 shown in FIG. 7 is performed.

FIG. 11 is a circuit diagram showing an embodiment 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, as the circuit section 144 indicated by a broken line, for example, an ordering No. manufactured by SGS-Thomson Co., Ltd. A "DMOS full bridge driver" that can be purchased with L6201 can be used. The power supply voltage + Vcc is applied to the load motor drive circuit 26, and at the same time, the duty control section 24 provided in the MPU 48 controls the on / off signal E for controlling the torque of the load motor 20.
₁₀ are given.

[0042] In this case, AND when the signal E ₁₀ is at the H level
The outputs of the gates 114 and 120 become H level, the outputs of the AND gates 116 and 118 become L level,
FETs 130 and 136 are turned on via FETs 2 and 128, while FETs 134 and 132 are turned off. Accordingly, the current to the load motor 20 flows from the FET 130 to the FET 136 as shown by a solid arrow, and in this state, for example, a load operation is performed.

When the signal E _{0 is set} to L level, AND
Gates 118 and 116 generate an H level output, and
ND gates 114 and 120 generate L level output, and FE
T134 and 132 are turned on, and FETs 130 and 136 are turned off.
A current flows in the direction indicated by the dashed arrow to become 132, and the load motor 20 rotates in the reverse direction to perform the unload operation. The FETs 130, 132, 13
4, 136, diodes for surge absorption are connected in parallel.

Next, the torque control of the load motor 20 by the duty control section 24 of FIG. 2 will be described with reference to the flowcharts of FIGS. The flowchart of FIG. 12 shows the 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 the unloading process at that time.

The load processing of FIG. 12 is characterized in that torque control is performed so as to reduce the driving torque of the load motor as compared with the unload processing. In order to reduce the driving torque of the load motor 20 during this load,
The duty control unit 24 is turned on in the RAM of the MPU 48,
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, at step S1, it is monitored whether or not a cartridge has been inserted. Specifically, it monitors whether or not the cartridge-in sensor 36 has been turned on. When the insertion of the cartridge is determined, step S2 is performed.
Then, the duty-on time T _ON and the duty-off time T _OFF are read from the ROM and loaded into the RAM.

Subsequently, at step S3, the voltage polarity is determined so as to drive the load motor 20 in the load direction, and the drive is turned on.
Wait only for _ON . When the ON time T _ON has elapsed, the drive of the load motor 20 is turned off in step S5, and the next step S6 waits for the _OFF time T _OFF of the RAM. Step S3 above
Every time the processing of steps S6 to S6 is performed, the load sensor 3
2 is turned on, and the load motor is repeatedly _turned on for T _ON time and turned _off for T _OFF time until the load sensor 32 is turned on. As a result, the load motor 20 is subjected to the PWM control based on 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 driven on. Because the current falls on average,
The driving torque can be reduced.

When the load sensor 32 is turned on by the unloading operation in which the driving torque is reduced and the completion of the loading is determined, the controller notifies the controller that the loading operation is completed in step S8, and ends a series of processing. Thereafter, the reading and writing processes for the loaded optical disk are started. FIG. 13 shows an unloading process for ejecting the cartridge after performing the loading operation shown in FIG.

In this unloading process, it is first monitored in step S1 whether an unload command has been issued from the controller. When the unload command is issued, the load motor 20 is turned on in step S2. I 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 end of the unload operation is notified to the controller in step S5 to mechanically eject the optical disk cartridge.

FIG. 14 is a flow chart showing another embodiment of the torque control of the load motor 20 by the duty control unit 24 shown in FIG. The loading process when used as a device is shown. Further, FIG.
Shows another embodiment of the unloading process when 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 pulled off 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 drive motor is driven with a reduced drive torque.

First, the load processing as the library apparatus in FIG. 4 is basically the same as the load processing when the apparatus is used in the stand-alone apparatus shown in FIG. 12, and the end of the load operation is determined in the final step S8. The difference is that the higher-level device is notified, and the other processes are the same. That is, even in the loading process as the library device, the on-drive and the off-drive of the load motor 20 are repeated at short time intervals, so that P
The drive torque is reduced by the WM control.

Next, a description will be given of an unloading process for gradually reducing the driving torque in FIG. 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 Is stored. Here, on, is set to the T _ON1> T _ON2 T _OFF1 a <T _OFF2 relationship with constant period T OFF time.

[0053] Furthermore C ₁ as a counter value to determine the value of the timer counter C for the torque switching is registered in advance. In FIG. 15, first, at step S1, it is monitored whether or not an unload command is issued from a higher-level device.
To proceed, the duty on-time T from ROM _ON1, T _ON2
And duty OFF time T _{OF F1,} T _OFF2, further loaded into the RAM by reading the torque switching counter value C _1.

Subsequently, at step S3, a 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 load motor 20 waits for the ON time T _ON1 that determines the first-stage drive torque.
_Is turned off, and the process waits for the off time T _{OFF1 in} step S7. Or more on-load motor 20, is incremented by 1 the value of the torque switching counter C in step S8 After completion of the off determines whether it has reached the torque switching counter value C ₁ in step S9.

Until the value of the torque switching counter C reaches the torque switching counter value C ₁ , T is determined in steps S 4 to S 8.
On of the load motor 20 over the _ON1 hours and T _OFF1 hours,
Repeat off. In step S9, the torque switching counter C
There is determined that the torque switching timing reaches the C _1, FIG. 1
Go to S10 of 6. In step S10, the load motor 20 is turned on, and in step S11, only 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 S12, the _process waits for the off time T _{OFF2 in} step S13, and then _{proceeds to} step S14.
To check whether the unload sensor 34 is turned on.

The on / off control for obtaining the second stage drive torque of the load motor 20 in S10 to S13, that is, the small drive torque, is repeated. When the unload sensor 34 is turned on, the process proceeds to step S15, and the unload sensor 34 is unloaded. Notifies the host device of the end of the loading operation. 12 and FIG.
Reference numeral 3 exemplifies a load process and an unload process in a stand-alone device, but the present invention can be similarly applied to a library device. This point can be similarly applied to the stand-alone device for the unloading process in the case of the library device shown in FIGS.

The duty control for alternately controlling the load motor 20 with a short on-time and an off-time in the above-described embodiment may be performed by changing the on-time and the off-time with a constant cycle, or by changing the on-time with an indefinite cycle. And duty control for changing the off time. Further, in the above embodiment, as shown in the flowcharts of FIGS. 15 and 16, the drive torque is initially increased only during the unload operation, and the drive torque is reduced when the optical disk is removed from attracting the magnet. In the loading operation, the driving torque may be increased first to bring the optical disk closer to the magnet, and then the driving torque may be decreased when the attracting force of the magnet comes out.

Further, by the torque control at the time of loading, for example, when the loading operation fails and abnormally ends, it is determined that the driving torque is insufficient, and the duty control is performed so as to increase the driving torque of the load motor as compared with the previous time. Perform load operation. The retry due to an increase in the driving torque of the unload motor when the loading operation fails and abnormally ends is also performed when the unload operation fails and the unload operation ends abnormally. The torque may be increased to retry.

[0059]

As described above, according to the present invention, it is possible to optimize the load motor and the unload motor by simply changing the control of the load motor by the firmware such as the MPU without adding new hardware. Torque control can be performed, quick 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 the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration 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 from below.

FIG. 5 is a bottom view of FIG. 3;

FIG. 6 is an explanatory diagram of a chucking structure of the optical disk of FIG. 2;

FIG. 7 is an explanatory view of the loading mechanism of FIG. 2;

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 diagram showing an internal state when the cartridge is completely inserted.

FIG. 11 is a circuit diagram of an embodiment of the load motor drive circuit of FIG. 2;

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

FIG. 13 is a flowchart showing unload processing 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 symbols]

 10: optical disk (recording medium) 12: cartridge (cartridge case) 14: spindle motor 16: rotating shaft 18: cartridge attaching / detaching mechanism (loading mechanism) 20: load motor 22: torque control means 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 fixing 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 housing 52: Support frame 54: Movable frame 56: Inner peripheral stopper 58 ： Outer circumference stopper 60 LED 62: PSD 64-1, 64-2: entrance / exit window 65: door 66: rail 68: roller 70: shaft hole 72, 74: hub 76: disk receiver 78: magnet 80: shutter 82: shutter holding plate 84: Notch 86: Opening 90: Slider member 92, 94: Guide groove 96, 98: Hook 100: Pinion gear 102: Rack gear 104: Sensor holding plate 106: Housing 108: Arm 110: Rotating shaft 112: Pin 114, 116, 118 , 120: AND gates 122, 124, 126, 128: driver 130, 1321, 134, 136: FET 138: resistor 140: pull-up resistor 142: inverter 144: circuit section

Claims (4)

(57) [Claims] 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. 1
4) A cartridge loading / unloading mechanism for performing a loading operation to be mounted on the rotating shaft (16) and performing an unloading operation for removing the optical disk (10) from the rotating shaft of the spindle motor (14) and discharging the cartridge (12) to the outside. (18)
And the cartridge attaching / detaching mechanism (18) by rotating in one direction.
A load motor (20) for performing a loading operation of the cartridge loading / unloading mechanism (18) by rotating in a reverse direction, and turning on a drive current of the load motor (20) in a short cycle.
Turn off to adjust the drive torque, and
Drive torque of the load motor (20) between the load operation and
Controls the on-time and off-time of the motor current to change
An optical disk device, comprising: 2. The optical disk device according to claim 1, wherein
Said torque control means (22), said cartridge detachable
Before loading the mechanism (18) before unloading
The driving torque of the load motor (20) is reduced.
An optical disk device characterized by controlling on time and off time of a motor current . 3. An optical disk housed in a cartridge (12).
A spindle motor (14) for rotating a disc (10) and a cartridge (12) inserted from the outside.
The optical disc (10) is moved to the spindle motor (1).
Line load operation to be mounted on the rotary shaft (16) of 4) UTO co
And the optical disk from the rotation axis of the spindle motor (14)
Remove (10) and eject cartridge (12) to the outside
Cartridge attaching / detaching mechanism for performing unloading operation (18)
And the cartridge attaching / detaching mechanism (18) by rotation in one direction.
The loading operation of the cartridge is performed, and the cartridge is rotated in the reverse direction.
Load motor for unloading the attachment / detachment mechanism (18)
(20) and the torque control means (22) includes:
When the mechanism (18) is loaded, the load motor (20)
Controls the supplied current on and off, and during unload operation
The current supplied to the load motor (20) is continuously turned on.
Optical disc apparatus, characterized by control. 4. The method according to any one of claims 1 to 3, wherein
In the above optical disk apparatus, the torque control means (2
2) The loading or unloading operation ends abnormally.
The driving torque of the load motor (20) increases.
An optical disc device that performs a loading operation or an unloading operation again .