JP3271217B2 - Disk drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an external magnetic field generator for applying an external magnetic field to a magneto-optical disk as a recording medium, and applies an external magnetic field to the magneto-optical disk with a magnetic field applying head of the external magnetic field generator. However, the present invention relates to a disk drive device capable of writing an information signal to the magneto-optical disk, that is, a so-called overwrite, particularly, when a trouble such as a power failure occurs during recording / reproduction, the magnetic field applying head is forcibly unloaded. To prevent damage to the disk and the magnetic field applying head such as sticking of the magnetic field applying head to the disk.

[0002]

2. Description of the Related Art There has been known a disk drive (magneto-optical disk drive) capable of performing both writing and reading of an information signal with respect to a magneto-optical disk.

[0003] The disk drive device includes a cartridge holder for loading and unloading the disk cartridge by inserting the disk cartridge, a disk rotation driving mechanism for rotating a magneto-optical disk in the disk cartridge, and a disk rotation drive mechanism. In addition to various mechanisms for reading information signals from a magneto-optical disk such as an optical pickup device that moves in the radial direction of the magneto-optical disk rotated by the rotation drive mechanism, the information signal is written to the magneto-optical disk. An external magnetic field generator that applies an external magnetic field when performing the operation, and a head loading mechanism that loads and unloads a magnetic field application head of the external magnetic field generator.

The reading of information signals from a magneto-optical disk is performed exclusively using an optical pickup device.

The writing of information signals to the magneto-optical disk is performed by loading the magnetic field applying head of the external magnetic field generating device with the head loading mechanism, that is, by bringing the magnetic field applying head into contact with the signal recording surface of the magneto-optical disk. This is performed by irradiating the magneto-optical disk with laser light or the like by the above-described optical pickup device while applying an external magnetic field to the disk.

[0006]

By the way, in the above-mentioned conventional disk drive device, loading and unloading of the magnetic field applying head are generally performed by the CPU in conjunction with loading and unloading of the disk cartridge. Has become.

For this reason, if power travel or the like occurs while the disk cartridge is being loaded,
It is difficult to return only the magnetic field applying head to the unloading state, and the magnetic field applying head is left in contact with the magneto-optical disk, and the magnetic field applying head adheres to the magneto-optical disk. Or the magneto-optical disk may be damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a disk drive capable of easily returning a magnetic field applying head to an unloading state even when a power supply trouble occurs during recording and reproduction. It is a thing.

[0009]

According to a first aspect of the present invention, there is provided an external magnetic field generator for applying an external magnetic field for writing an information signal to a disk as a recording medium, and a magnetic field of the external magnetic field generator. In a disk drive device provided with a head loading mechanism for loading and unloading an application head, the release of the magnetic piece is released by applying an open pulse voltage to the head loading mechanism, and the magnetic field application head is unloaded. A voltage detection circuit that uses an electromagnetic clutch for returning to the loading state, and detects the fluctuation of the power supply voltage by using the electromagnetic clutch;
When a change in the power supply voltage is detected by the voltage detection circuit, the opening control is performed by a control unit including a pulse signal generation circuit for generating an opening pulse signal.

[0010]

According to a second aspect of the present invention, there is provided an external magnetic field generator for applying an external magnetic field for writing an information signal to a disk as a recording medium, and loading and unloading of a magnetic field applying head of the external magnetic field generator. In a disk drive device including a head loading mechanism for performing loading, the head loading mechanism is released from the magnetic piece by applying an open pulse voltage,
An electromagnetic clutch for returning the magnetic field applying head to the unloading state is used, and the electromagnetic clutch is used to detect that an emergency operation rod has been inserted, and an emergency operation rod is inserted by the insertion detection circuit. When the occurrence is detected, the opening control is performed by the control means provided with a pulse signal generating circuit for generating an opening pulse signal.

According to a third aspect of the present invention, there is provided an external magnetic field generator for applying an external magnetic field for writing an information signal to a disk as a recording medium, and loading and unloading of a magnetic field applying head of the external magnetic field generator. In a disk drive device including a head loading mechanism for performing loading, the head loading mechanism is released from the magnetic piece by applying an open pulse voltage,
An electromagnetic clutch for returning the magnetic field applying head to the unloading state; a position detection circuit for detecting the position of the disk cartridge in the loading state; and a position of the disk cartridge detected by the position detection circuit. When the operation is not normal, the opening control is performed by a control unit having a pulse signal generating circuit for generating an opening pulse signal.

[0013]

In the disk drive device according to the first aspect,
During recording / reproduction, when the power supply voltage fluctuates due to a power supply trouble or the like, for example, decreases, the voltage detection circuit detects this, and the pulse signal generation circuit generates an open pulse signal, whereby the open pulse voltage is applied to the electromagnetic clutch. Then, the suction of the magnetic piece by the electromagnetic clutch is released.

[0014]

[0015] In the disk drive apparatus according to claim 2, in recording and reproducing, when the power supply trouble or the like occurs,
When the emergency operation rod is inserted into a predetermined position, the insertion of the emergency operation rod is detected by an insertion detection circuit, and a pulse signal generation circuit emits an open pulse signal, whereby an open pulse voltage is applied to the electromagnetic clutch, and Release the magnetic piece from the clutch.

[0016] In the disk drive apparatus according to claim 3, by the disk cartridge is loaded in position not normal, such as by tilting the position detection circuit
Pulse signal that generates an open pulse signal when
An open pulse voltage is applied to the electromagnetic clutch by the raw circuit to release the magnetic piece from being attracted by the electromagnetic clutch.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
This will be described with reference to FIG.

FIG. 1 is an exploded perspective view of a main part of the disk drive device.

The disk drive device 1 includes an external magnetic field generator 2 for applying an external magnetic field when recording an information signal on a magneto-optical disk 201 as a recording medium,
A head loading mechanism 3 for loading and unloading the magnetic field application head 21 of the external magnetic field generator 2 is provided.

The head loading mechanism 3 includes an electromagnetic clutch 76 for releasing the magnetic piece 100 by applying an open pulse voltage and unloading the magnetic field applying head 21.

As shown in FIG. 2, the electromagnetic clutch 76 detects a change in the power supply voltage (for example, 5 V), and the voltage detection circuit 4 detects the change in the power supply voltage. At this time, the opening is controlled by the control means 6 having the pulse signal generating circuit 5 for generating the opening pulse signal.

During recording and reproduction, when a power supply trouble, for example, a power failure occurs, and the voltage 5 V of the power supply voltage 4 drops to a reference value, for example, 4.5 V or less, the voltage detection circuit 4 detects this, An opening pulse signal is issued from the pulse signal generating circuit 5, and an opening pulse voltage is applied to the electromagnetic clutch 76.
00 is released, and the magnetic field application head 21 returns to the unloading state.

In FIG. 2, reference numeral 7 denotes an electromagnetic clutch 76.
Is a power supply for the electromagnetic clutch, and 9 is a CPU of the disk drive.

In FIG. 1, reference numeral 201 denotes a magneto-optical disk, 202 denotes a cartridge containing the magneto-optical disk 201, and 203 denotes a shutter member slidably mounted on the cartridge 202. Cartridge 202, shutter member 20
3 constitutes the disk cartridge 204.

Next, each component will be described in detail.

First, the external magnetic field generator 2 will be described.

The external magnetic field generator 2 includes a magneto-optical disk 2
The apparatus has a magnetic field applying head 21 for applying an external magnetic field of a predetermined strength to the signal recording surface of No. 01, and the magnetic field applying head 21 is attached to a carriage 23 by a holding mechanism 22.

As shown in FIGS. 8 and 9, the holding mechanism 22 is attached to the rear end of the carriage 23 and has a notch 24 at one side edge. The holding plate 22 is made of a magnetic material such as iron. And a notch 2 provided above the holding plate 25 and rotatably held at the rear end of the carriage 23 via a rising portion 23a.
A lifter 27 for holding a magnet 26 facing inside 4;
A head arm 29 provided above the lifter 27 and elastically held by the rising portion 23a of the carriage 23 and holding a slider 28 incorporating the magnetic field applying head 21;
1 can be held in a loading state and an unloading state.

The lifter 27 of the holding mechanism 22 includes a base piece 31 having a pivot pin 30 at the center thereof, and the head arm 29 provided integrally with a front end edge of the base piece 31.
Arm support portion 32a having a substantially U-shaped section in cross section, having an arm support portion 32a at its front end edge capable of holding the arm member, and an arm support portion 32a provided behind the arm support portion 32 and formed integrally with the rear end edge of the base portion 31. And an L-shaped driving force receiving portion 33 having a bent portion 33a protruding to one side, and provided below the driving force receiving portion 33 and formed integrally with the base portion 31 and A magnet support piece 34 for holding the magnet 26 is shown in FIG.
As shown in FIG. 9, when the magnetic field application head 21 is unloaded, it is attracted to the notch surface 24a of the notch 24, and as shown in FIG. 9, it is attracted to the notch surface 24b during loading (after loading of the magnetic field application head). It is configured to:

On the other hand, as shown in FIG. 8, the slider 28 separates from the signal recording surface of the magneto-optical disk 201 during unloading in order to secure the stability when the head floats. As shown in FIG. 9, at the time of loading, the slider 28 is moved from the signal recording surface of the magneto-optical disk 201 by several grams to 1 gram.
It is configured so that it can be pressed with a repelling force of about 0 g.

Next, the carriage 23 will be described.

As shown in FIGS. 5 to 7, the carriage 23 is held on the chassis via two guide shafts 41, 41 which are parallel to each other at a predetermined interval in the left-right direction so as to be able to move forward and backward. ing.

On one side surface of the carriage 23, two pairs of bearings 42 are positioned so that the rotation axes of the respective bearings are set at an angle of 90 ° to each other. The bearings 42 are similarly positioned with their bearing rotation axes set at an angle of 90 ° to one another. In addition, the carriage 23 has an elastic body 43 that imparts a resilient force to one of the bearings 42 of the pair in such a direction that the angle between the rotation shafts of the two bearings is smaller than 90 °. (See FIG. 7) is fixed.

On both sides of the carriage 23, linear motors 44 for driving the carriage are provided.

The linear motor 44 includes a frame-shaped coil 45 protruding to both sides of the carriage 23, a center yoke 46 facing a part of the coil 45,
It is composed of a magnet 47 and a lower yoke 48.

Further, the carriage 23 is provided with a lens holder 52 for holding the objective lens 51 via two elastic members 53 which are vertically arranged in parallel.

The lens holder 52 includes a magnetic circuit 54
, So that it can be displaced in the focus direction.

The magnetic circuit 54 includes the objective lens 51
Frame-shaped coil 55 projecting to both sides of the
5 includes a center yoke 56 opposed to a part of the center yoke 5, a magnet 57 and a side yoke 58.

Further, the fixed optical system 6 of the optical pickup device 114 described later is mounted on the carriage 23.
In order to guide the light beam from 1 to the objective lens 51, a beam passage hole 23b is provided as shown in FIG. 8A, and a rising mirror 62 located immediately below the objective lens 51 is fixed. .

Next, the head loading mechanism 3 will be described.

As shown in FIG. 10, the head loading mechanism 3 has two side walls 71, 71 facing each other.
And a base 73 having a bottom plate 72 interposed between the side walls 71, 71, a swingable first plate 74 pivotally supported by the base 73, and a swing caused by the swing of the first plate 74. A possible second plate 75;
A self-holding type electromagnetic clutch (plunger) 76 capable of holding the second plate 75 at a predetermined swinging position by pressing the first plate 74;
4 and a drive motor 77 (see FIG. 13) for ejecting the disk cartridge 204 by sliding a slide plate 121 of an elevating mechanism 113, which will be described later, and the carriage connected to the drive motor 77. And a transmission gear 79 having a columnar pin 78 protruding in a direction perpendicular to the direction in which the 23 moves forward and backward on the peripheral edge of one side surface.

The bottom plate 72 of the base 73 has two spring locking holes 81 and 82 which are opened on both front and back surfaces at the end edge on the side opposite to the motor and are arranged in parallel at a predetermined interval.
A stopper 83 is provided which protrudes upward in the vicinity of the spring locking hole 82 substantially at the center of the spring locking holes 81 and 82.

On both side walls 71 of the base 73,
Shaft holes 71a, 71a are provided above the distal end surface of the stopper 83 and support a holding shaft 84 extending in the advancing and retreating direction of the carriage 23.

Two rising walls 85, 85 are provided at both side edges of the first plate 74 at predetermined intervals in the direction in which the holding shaft 84 extends. 85, 85 are provided with insertion holes 85 a, 85 a into which the holding shaft 84 is loosely fitted.

A plate pressing portion 86a protruding in the retreating direction of the carriage 23 and a lifter pressing protruding in a direction perpendicular to the protruding direction of the plate pressing portion 86a are provided at the edge of the first plate 74 on the side opposite to the motor. A pressing piece 86 having a portion 86b is provided integrally.

A spring locking hole 87 corresponding to the spring locking hole 82 is provided at the center of the first motor plate 74 on the side opposite to the motor.

The first plate 74 is urged by a tension spring 88 in a direction in which the plate pressing portion 86a contacts the stopper 83. In addition,
Both ends of the tension spring 88 are locked in the spring locking holes 82 and the spring locking holes 87, respectively.

On the other hand, the second plate 75 is provided with holding walls 89, 89 interposed between the side walls 71, 71 and the rising walls 85, 85 and comb teeth 91a corresponding to the moving range of the carriage 23. , A bent piece 91 provided at the tip thereof.

Further, the second plate 75 is provided with a spring locking hole 92 corresponding to the spring locking hole 81.

The holding walls 89, 8 of the second plate 75
9 is provided with an insertion hole 93 into which the holding shaft 84 is loosely fitted.

Further, both holding walls 8 of the second plate 75 are provided.
9 and 89, the holding wall on the carriage retreating side has a pin hole 94 that opens in the same direction as the opening direction of the insertion hole 93.
Further, a protrusion 95 corresponding to the plate pressing portion 86a is provided.

The second plate 75 is urged by a tension spring 96 in a direction in which the comb teeth 91 a mesh with the driving force receiving piece 33 of the lifter 27. Both ends of the tension spring 96 are locked in the spring locking holes 81 and the spring locking holes 92, respectively.

Further, a holding arm 98 is rotatably provided on the second plate 75 with a recess 97 facing one end of the holding shaft 84 as a pivotal support.

The holding arm 98 has two long and short arms 9.
8a and 98b.
The carriage 23 is attached to the longer arm 98a.
Is integrally provided with a holding portion 99 projecting rearward.
A magnetic piece 100 made of, for example, iron, which can be attracted to the electromagnetic clutch 76, is rotatably provided on the distal end surface of the holding portion 99. Note that this magnetic piece 100 is
1 restricts the rotation. On the other hand, the short arm 9
8b is provided with a pin 102 inserted into the pin hole 94.

The electromagnetic clutch 76 is provided with a screw 1 on the rear side wall of the side walls 71, 71 of the base 73.
03 and the second plate 7
5 is the driving force receiving portion 33 of the lifter 27.
It is configured to adsorb the magnetic piece 100 at a position separated from the magnetic piece 100.

In FIG. 1, reference numeral 111 denotes a cartridge holder; 112, a disk rotation drive mechanism for rotating the magneto-optical disk 201; 113, an elevating mechanism for raising and lowering the disk rotation drive mechanism 112 with respect to the cartridge holder 111; Reference numeral 114 denotes an optical pickup device.

The cartridge holder 11 has an auto-injection mechanism 115 for automatically pulling the disk cartridge 204 to a predetermined mounting position, and a shutter opening mechanism 116 for automatically opening the shutter member 203 of the disk cartridge 204.

The disk rotation drive mechanism 112 includes a spindle motor 117, a disk table 118 rotated by the spindle motor 117, and a chucking magnet 119 mounted in a recess of the disk table 118. I have.

The elevating mechanism 113 includes an elevating plate 120 provided with the disk rotation driving mechanism 112 and the elevating plate 12.
And a slide plate 121 for raising and lowering the zero.

The optical pickup device 114 is configured to irradiate the signal recording surface of the magneto-optical disk 201 with laser light. Unlike the conventional integrated optical system, the optical pickup device 114 is a separation optical system in which a movable portion is lightened in order to cope with high-speed access.

That is, the optical pickup device 11
Reference numeral 4 denotes a fixed optical system 61 having a laser diode serving as a light source used for recording and reproduction, a signal detector used for performing focus and tracking control, a signal detector for detecting a recording signal, and the like, as shown in FIG. , This fixed optical system 6
It comprises the objective lens 51 for condensing the light beam from 1 on the signal recording surface of the magneto-optical disk 201, and the galvano mirror 122 located behind the carriage and used for performing tracking control.

In this separation optical system, the galvanomirror 122 is set at the center angle, and the carriage 23 and the fixed optical system 61 are set at both ends.
It is arranged at the position of the letter.

The galvanometer mirror 122 includes the fixed optical system 61 and the carriage 23 and the fixed optical system 61.
Is reflected, and the reflected light beam is guided to the optical system of the carriage 23 to perform tracking control by changing the angle of the mirror reflection surface.

As shown in FIG. 3, the disk drive device having the above-described structure has a substantially U-shaped cross section of the chassis 1.
31, a housing 132 containing the above-described various mechanisms for recording and reproducing data on and from the disk cartridge 204 and the magneto-optical disk 201, and provided on the front surface of the housing 132 and externally mounted when incorporated in, for example, a computer main body or a subsystem. And a front panel 133 exposed to the front.

The front panel 133 is provided with a cartridge slot 134 for inserting and removing the disk cartridge 204 into and out of the housing 132. A lid for opening and closing the cartridge slot 134 for preventing dust from entering. A body 135 is rotatably mounted.

The front panel 133 is provided with a light emitting element 136 for displaying a recording / reproducing operation state for the magneto-optical disk 201 and an eject button 137 for ejecting the disk cartridge 203. An emergency operation rod insertion hole 138 is provided below the eject button 137.

Next, the head loading operation by the head loading mechanism 3 will be described.

The cartridge slot 1 of the front panel 133
When the disk cartridge 204 is inserted into the housing 132 from the position 34, the auto-injection mechanism 115 of the cartridge holder 111 causes the disk cartridge 204 to be inserted.
Is automatically drawn into the cartridge mounting position, and the loading of the disk cartridge 204 is completed.

When the loading of the disk cartridge 204 is completed, the disk table 118 is raised to a predetermined position by the elevating mechanism 113, and the disk table 118 is moved by the chucking magnet 119.
The magneto-optical disk 201 is held thereon by suction.

At this time, as shown in FIG. 13, the resilient force of the tension spring 96 causes the comb teeth 9 of the bent piece 91 to move.
The second plate 75 is positioned at a position where the bent portion 33a of the driving force receiving piece 33 engages with the first plate 75 as shown by a solid line in FIG.

Then, as shown in FIG.
Is separated from the magneto-optical disk 201, and the magnet 26 of the holding mechanism 22 is suction-held on the notch surface 24a.

The transmission gear 79 is driven by the drive motor 77.
The pin 78 as shown in FIG. 15 to impart a rotational force of the position counter eject direction toward a position b to be displaced to a predetermined rotational position from a (O / W head loading direction) R ₂ in.

At this time, the first plate 74 at the position shown by the solid line in FIG.
8, the first plate 74 swings counterclockwise against the elastic force of the tension spring 88.
The second plate 75 swings in the same direction against the resilience of the tension spring 96 as shown by a two-dot chain line in FIG. The swing of the second plate 75 causes the holding arm 9 to move.
8, the magnetic piece 100 is attracted to the electromagnetic clutch 76 (no electricity is required).

As a result, as shown in FIG. 14, the second plate 75 is positioned at a position where the bent portion 33a of the driving force receiving piece 33 and the comb teeth 91a of the bent piece 91 are separated from each other. The rotation of the transmission gear 79 is stopped by a rotation angle detection switch (not shown).

After the drive motor is reversed by switching a changeover switch (not shown), a rotational force (reversal force) in the eject direction R ₁ is applied to the transmission gear 79 until the pin 78 is displaced from the position b to the position a. The drive motor 77 is stopped.

At this time, as shown by a solid line in FIG. 12, the first plate 74 swings clockwise by the elastic force of the tension spring 96 and contacts the stopper 83.

The detection switch (not shown) controls the ROM
After detecting a disk or a RAM disk (partial ROM disk), if the disk is a ROM disk, a normal read sequence is performed after the spindle motor 117 is rotated to focus in.

On the other hand, when a detection switch (not shown) detects a RAM disk (partial ROM disk), the loading operation of the magnetic field applying head 21 to the magneto-optical disk 201 is performed as follows.

By energizing the coil 45 of the linear motor 44, a moving force to the outermost periphery of the magneto-optical disk 201 is applied to the carriage 23.

[0080] To impart rotational force to the pin 78 as shown in FIG. 15 to the transmission gear 79 by the drive motor 77 is displaced to a position b from the position a counter-ejection direction R _2.

At this time, when the pin 78 is pressed by the rotation of the transmission gear 79, the first plate 74 swings counterclockwise against the elasticity of the tension spring 88 as shown in FIG.

As a result, the lifter 27 is rotated by the pressing of the lifter pressing portion 86b against the driving force receiving portion 33, and the slider 28 is seated (loaded) on the magneto-optical disk 201. Part 32a
Arm 29 is separated from the head arm 29. At this time, the magnet 26 is released from the attraction state with the notch surface 24a and is attracted and held at the notch surface 24b.

By switching the changeover switch (not shown), the drive motor 77 is reversed and the pin 7 is connected to the transmission gear 79.
Eject direction R until 8 is displaced from position b to position a
_After the rotation force (reversing force) of ₁ is applied, the drive motor 77 is stopped.

Thus, the loading operation of the magnetic field applying head 21 is performed.

Thereafter, the spindle motor 117 is rotated, and a normal read / write sequence is performed after focus-in.

Next, the unloading operation of the magnetic field applying head 21 with respect to the magneto-optical disk 201 will be described.

The spindle motor 117 is stopped by an eject command from the CPU 9.

When the release pulse voltage is applied to the electromagnetic clutch 76, the attraction piece 100 is separated from the electromagnetic clutch 76, and as shown by a solid line in FIG. The plate 75 integrally rotates clockwise.

At this time, as shown in FIG.
The second plate 75 is positioned as shown by the solid line in FIG.

As a result, as shown in FIG.
Is rotated clockwise, the magnet 26 of the holding mechanism 22 releases the suction state with the notch surface 24b, and the notch surface 24a
To the arm support portion 32 of the arm support piece 32.
2a pushes up the head arm 29, and the slider 28 to the magnetic field applying head 21 are separated from the magneto-optical disk 201.

[0091] To impart rotational force of the ejection direction R ₁ until the pin 71 as shown in FIG. 15 to the transmission gear 79 by the drive motor 77 is displaced to a position b from the position a.

At this time, the slide plate 121 is moved from the loading position to the unloading position by the pressing of the pin 78 against the slide plate return piece 141 (see FIG. 1) due to the rotation of the transmission gear 79, against the elasticity of the tension spring 142. Pull back.

Then, the elevating plate 120 is lowered by the retraction operation of the slide plate 121, and the disc cartridge 204 is inserted into the cartridge slot 134 by the auto-injection mechanism 115 of the cartridge holder 111.
From the housing 132.

By switching a changeover switch (not shown), the drive motor 77 is reversed and the pin 7 is connected to the transmission gear 79.
8 is a drive motor 77 after applying the rotational force of the anti-ejection direction R ₂ (reversing force) until displaced to position a from the position b
To stop.

Thus, the unloading operation is performed, and the process waits for the disk cartridge 204 to be inserted again. The above series of operations are performed by the CPU 9
Automatically controlled by

Next, a case where the power supply voltage fluctuates due to a power supply trouble during recording / reproduction and the power supply voltage drops below the reference value (set value) will be described.

The voltage detecting means 4 detects the decrease in the power supply voltage.

When the voltage detecting circuit 4 detects a drop in the power supply voltage, the pulse signal generating circuit 5 generates an open pulse signal, and the open pulse voltage is applied to the electromagnetic clutch 4 from the power supply 8 of the electromagnetic clutch. When the release pulse voltage is applied to the electromagnetic clutch 76, as described above, the electromagnetic clutch 7
The magnetic piece 100 is separated from 6, and the holding arm 98 and the second plate 75 are integrally rotated clockwise by the elastic force of the tension spring 96.

As a result, the lifter 27 rotates clockwise, the magnet 26 of the holding mechanism 22 releases the suction state with the notch surface 24b, and is attracted to the notch surface 24a. The arm supporting portion 32a pushes up the head arm 29, and the slider 28 to the magnetic field applying head 21 are separated from the magneto-optical disk 201, so that the magnetic field applying head 21 enters an unloading state.

FIG. 16 shows another example which is not directly related to the claims .
FIG. 3 is a block diagram illustrating a main part of a control unit of the disk drive device according to the embodiment .

In the disk drive of the other embodiment , the electromagnetic clutch 76 is
Control circuit comprising: a rotation number detection circuit 151 for detecting a change in the rotation number of the spindle motor; and a pulse signal generation circuit 152 for generating an open pulse signal when the rotation number detection circuit 151 detects a change in the rotation number of the spindle motor 117. The opening is controlled by means 153.

When the number of rotations of the spindle motor 117 is reduced or stopped during recording or reproduction due to a power supply trouble or the like, the rotation detection circuit 151 detects this and the pulse signal generation circuit 152 generates an open pulse signal. , An open pulse voltage is applied to the electromagnetic clutch 76.

When the release pulse voltage is applied to the electromagnetic clutch 76, the magnetic piece 100 is separated from the electromagnetic clutch 76 as described above, and the magnetic field applying head 21 enters the unloading state.

FIG. 17 is a block diagram showing a main part of the control means of the disk drive device according to the second aspect .

In the disk drive of the second embodiment, the electromagnetic clutch 76 has an insertion detecting circuit 161 for detecting that the emergency operation rod has been inserted into a predetermined position, and the emergency operation rod is inserted by the insertion detection circuit 161. When the occurrence is detected, the opening is controlled by the control means 163 provided with the pulse signal generating circuit 162 for emitting the opening pulse signal.

During recording and reproduction, when the spindle motor stops rotating with the magnetic field applying head still in contact with the magneto-optical disk due to a power failure or the like, as shown in FIG. The emergency operation rod 164 is inserted through the emergency operation rod insertion hole 138 provided on the front panel 133 of the disk drive device.

The emergency operation stick 164 shuts off between the light emitting part 161a and the light receiving part 161b of the photo sensor as the insertion detecting circuit 161 disposed inside the front panel 133.

Therefore, the insertion of the emergency operation rod 164 is detected by the insertion detection circuit 161, a release pulse signal is generated from the pulse signal generation circuit 162, and a release pulse voltage is applied to the electromagnetic clutch 76.

When the release pulse voltage is applied to the electromagnetic clutch 76, the magnetic piece 100 is separated from the electromagnetic clutch 76, and the magnetic field applying head 21 enters the unloading state.

In the disk drive of the first and second aspects, as shown in FIG. 19, the release pulse signals from the pulse signal generation circuits 5, 152, 162 are input to the CPU 9 as so-called interrupt pulse signals. The CP
It is also conceivable to issue a release command (command) for the electromagnetic clutch 76 from U9.

However, In this case, the CP
When U9 runs away, there is a risk that the electromagnetic clutch 76 cannot be controlled even if an interrupt pulse signal is issued.

FIG. 20 is a block diagram showing a main part of the control means of the disk drive device according to the third aspect .

In the disk drive of the third aspect , the electromagnetic clutch 76 has a position detecting circuit 171 for detecting the position of the disk cartridge 204 in the loading state, and the position of the disk cartridge 204 detected by the position detecting circuit 117 is normal. the solution when it is not in
Control with pulse signal generation circuit that emits release pulse signal
The opening is controlled by means .

A plurality of position detection sensors are used in the position detection circuit 117. The position detection sensors read the heights of a plurality of positions of the disk cartridge 204, and tilt the disk cartridge 204. Instead, it is detected whether or not it is loaded at a regular position.

Then, the position detection circuit 117
When it is detected that the disk cartridge 204 is not loaded in the proper position, the CPU 9 issues a magnetic field application head loading release command. When the magnetic field application head 21 is in the loading state, the release pulse voltage is applied to the electromagnetic clutch 76. Applied, electromagnetic clutch 76
The magnetic piece 100 is separated from the magnetic field, and the magnetic field applying head 21 is returned to the unloading state.

When the magnetic field applying head 21 is in the unloading state, the magnetic field applying head 21 is maintained in the unloading state, and the magnetic field applying head is applied to the magneto-optical disk of the disk cartridge that has not been loaded at the proper position. 21 is prevented from coming into contact. Note that a cartridge identification sensor 171 as shown in FIG. 1 may be used as the position detection sensor.

[0117]

The disk drive of the present invention has the following effects.

(1) In the disk drive device according to the first aspect, a voltage fluctuation due to a power failure such as a power failure is detected by a voltage detection circuit, and a release signal is generated by a pulse signal generation circuit to control release of the electromagnetic clutch. By doing
Even if a power supply trouble occurs during recording / reproducing, the magnetic field applying head is returned to the unloading state promptly and the magnetic field applying head is left in contact with the disk for a long time, so that the magnetic field applying head can Can be prevented from sticking.

[0119]

( 2 ) In the disk drive device according to the second aspect , when the emergency operation rod is inserted into a predetermined position, the insertion detection circuit detects this and controls the release of the electromagnetic clutch to unload the magnetic field application head. You can return to the state.

( 3 ) The disk drive of claim 3 detects the position of the loaded disk cartridge, and opens the disk cartridge if the loading position is not normal.
The magnetic field application head is returned to the unloading state by issuing a magnetic field application head loading release command from the pulse signal generation circuit that emits the release pulse signal, thereby preventing the magnetic field application head from sticking to the disk or preventing the magnetic field application head from being unloaded. It is possible to prevent the magnetic field applying head from coming into contact with the disk by standing by as it is.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a first embodiment of the present invention.

FIG. 2 is a block diagram of a main part of control means of the disk drive device according to claim 1;

FIG. 3 is a perspective view showing the appearance of the disk drive device.

FIG. 4 is a sectional view showing the internal structure of the disk drive device.

FIG. 5 is a perspective view showing a carriage portion.

FIG. 6 is an exploded perspective view showing a lens holder part.

FIG. 7 is a sectional view of a main part of FIG. 5;

FIGS. 8A and 8B are a side view for explaining an unloading state of the magnetic field applying head and a view on an arrow X thereof.

FIGS. 9A and 9B are a side view for explaining a loading state of the magnetic field applying head and a view taken in the direction of the arrow Y. FIG.

FIG. 10 is an exploded perspective view of a head loading mechanism.

FIG. 11 is a perspective view of a head loading mechanism.

FIG. 12 is a front view showing the operation state of the head loading mechanism.

FIG. 13 is a perspective view showing a shipping locked state of the carriage.

FIG. 14 is a perspective view showing a shipping lock released state of the carriage.

FIG. 15 is a side view showing the transmission gear (as viewed in the direction of arrow Z in FIG. 14).

FIG. 16 is a block diagram of a main part of control means of a disk drive device according to another embodiment .

FIG. 17 is a block diagram of a main part of control means of the disk drive device according to claim 2 ;

FIG. 18 is a sectional view showing a state where an emergency operation rod is inserted.

FIG. 19 is a block diagram of another embodiment.

FIG. 20 is a block diagram of a main part of control means of the disk drive device according to claim 3 ;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disk drive device 2 ... External magnetic field generator 3 ... Head loading mechanism 4 ... Voltage detection circuit 5 ... Pulse signal generation circuit 6 ... Control means 9 ... CPU 21 ... Magnetic field application head 76 ... Electromagnetic clutch 138 ... Emergency operation rod insertion hole Reference numeral 151: rotation speed detection circuit 152: pulse signal generation circuit 153: control means 161: insertion detection circuit of an emergency operation rod 162: pulse signal generation circuit 163 ... control circuit 164: emergency operation rod 171: disk cartridge position detection circuit 201 Magneto-optical disk 204: Disk cartridge

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 11/105 G11B 21/12-21/14

Claims (3)

(57) [Claims] 1. An external magnetic field generator for applying an external magnetic field for writing an information signal to a disk as a recording medium, and a head loading for loading and unloading a magnetic field applying head of the external magnetic field generator. A head drive mechanism, wherein the head loading mechanism includes an electromagnetic clutch for releasing the magnetic piece by applying an open pulse voltage and returning the magnetic field application head to an unloading state, The electromagnetic clutch is controlled by a control means including a voltage detection circuit for detecting a change in the power supply voltage and a pulse signal generation circuit for generating an open pulse signal when the change in the power supply voltage is detected by the voltage detection circuit. A disk drive device characterized in that the disk drive device is adapted to be used. 2. An external magnetic field generator for applying an external magnetic field for writing an information signal to a disk as a recording medium, and head loading for loading and unloading a magnetic field application head of the external magnetic field generator. A head drive mechanism, wherein the head loading mechanism includes an electromagnetic clutch for releasing the magnetic piece by applying an open pulse voltage and returning the magnetic field application head to an unloading state, The electromagnetic clutch has an insertion detection circuit that detects that the emergency operation rod has been inserted into a predetermined position, and when the insertion detection circuit detects that the emergency operation rod has been inserted,
A disk drive device characterized in that opening control is performed by control means having a pulse signal generating circuit for generating an opening pulse signal. 3. An external magnetic field generator for applying an external magnetic field for writing an information signal to a disk as a recording medium, and head loading for loading and unloading a magnetic field application head of the external magnetic field generator. A head drive mechanism, wherein the head loading mechanism includes an electromagnetic clutch for releasing the magnetic piece by applying an open pulse voltage and returning the magnetic field application head to an unloading state, The electromagnetic clutch includes a position detection circuit that detects a position of the disk cartridge in a loading state, and a pulse signal that generates an opening pulse signal when the position of the disk cartridge detected by the position detection circuit is not normal.
A disk drive device which is controlled to be opened by control means having a signal generation circuit .