JPH05334762A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To prevent the damage of a disk and a magnetic head due to erroneous loading of the multi-unable disk. CONSTITUTION:A magnetic head 10 is disposed to face oppositely on an optical head 6 through an arm 13, a supporting base 8 and a gimbals 9. A lever member 11 is attached rotatably to a holder 3 loading a cartridge 2 housing the disk 1. An engaging projection 11a, and a lift projection 11b are formed on the lever member 11. When the cartridge 2 housing the disk 1 unsuitable for overwrite is loaded in the holder 3, the engaging projection 11a interferes with the cartridge 2 and the lever member 11 is rotated and the supporting base 8 is rotated by the lift projection 11b and the magnetic head 10 is retreated from the disk and contact with the disk is retreated. The rotation of the supporting base 8 is detected by a position detector 15 and a write prohibition mode to the disk is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device having a structure capable of overwriting a disk by magnetic field modulation.

[0002]

2. Description of the Related Art In a magnetic field modulation type overwritable magneto-optical disk device, a magnetic head for magnetic field modulation is arranged to face the optical head. The magnetic head faces above the disk with a gap of about 10 μm when the disk rotates, and is in contact with the disk surface when the disk stops rotating. In this state, if the cartridge containing the disk is taken in and out, the magnetic head and the disk interfere with each other and are destroyed. Therefore, it is necessary to retract the magnetic disk when the cartridge is taken in and out.

Therefore, in the magneto-optical disk device disclosed in Japanese Patent Laid-Open No. 3-73449, the magnetic head is supported by a shape memory alloy, and the optical head and the magnetic head are moved by a linear actuator to the outside of the recording area at the outermost circumference of the disk. At the same time, a mechanism for heating and cooling the shape memory alloy with a Peltier element to move the magnetic head up and down to retract after the movement is disclosed. In this case, it is necessary to load the cartridge prior to lowering the magnetic head, and use the switch of Japanese Utility Model Laid-Open No. 62-90458 as a sensor switch for electrically detecting the loading of the cartridge. However, this switch only detects the loading of the cartridge, not the type of the cartridge.

In a magneto-optical disk device capable of overwriting by magnetic modulation, the magnetic head comes into contact with the disk when the rotation is stopped, or the external vibration of the magnetic head causes the magnetic head to come into contact with the disk. A hard coat layer for the is formed on the disc. On the other hand, in the light modulation type rewritable magneto-optical disk apparatus, an electromagnet or a permanent magnet is arranged above the disk with a gap of 0.5 to 1 mm, so that a bias magnetic field is recorded at the time of recording / erasing information. Is being applied. In this optical modulation type magneto-optical disk device, since the electromagnet and the permanent magnet do not come into contact with the disk, it is possible to use a disk whose recording surface is covered with a weak protective layer.

[0005]

From the above, when information is reproduced from an optical modulation type disk by using a magnetic field modulation type magneto-optical disk device, the magnetic head comes into contact with the disk to cause the disk to come out. However, there is an inconvenience of damaging or destroying the recording surface of. Further, in the conventional apparatus, since the load detection of the cartridge and the vertical movement of the magnetic head are electrically detected by the sensor switch, this detection cannot be performed at the time of power failure or power OFF. For this reason, it is not possible to grasp the state in which the magnetic head is in contact with the recording surface of the disk, and there is also a problem that the magnetic head is damaged during an emergency eject or a manual load in this state. Further, the conventional magneto-optical disk device does not detect the type of the cartridge only by detecting the loading of the cartridge. Therefore, when a disk that cannot be overwritten is erroneously loaded, the reading or writing of the disk cannot be performed. It was.

The present invention has been made in consideration of the above circumstances, and provides a magneto-optical disk device capable of reliably preventing damage or destruction of a disk or a magnetic head and preventing malfunction when a wrong disk is loaded. The purpose is to provide.

[0007]

In order to achieve the above object, a magneto-optical disk apparatus of the present invention comprises a main body into which a cartridge containing a rewritable disk is removably loaded, and a magnetic field provided in the main body. A magnetic head that enables overwriting on a disk by modulation, a relief portion provided only in a cartridge that accommodates an overwritable disc, and an engagement protrusion are formed at a position facing the relief portion of the cartridge. And a lever member engaged with the magnetic head so as to displace the magnetic head with respect to the disc so that the magnetic head can be moved toward and away from the disc. While the engaging projections enter the escape portion of the cartridge to move the magnetic head closer to the recordable position of the disk. Engaging projection of the disk that is not suitable for overwriting by the loading of the storage cartridges is characterized in that it operates to separate the cartridge and engaged with the magnetic head from the disk.

The magneto-optical disk apparatus of the present invention is also characterized in that the main body is provided with a position detector for detecting that the magnetic head has approached the disk to a position where overwriting is possible.

[0009]

In the above structure, when a cartridge containing a disc capable of overwriting is loaded, the engaging projection of the lever member enters the escape portion to bring the magnetic head close to the disc, and thus the disc can be overwritten. However, when a cartridge containing a disc that is not suitable for overwriting is loaded, the engaging protrusion of the lever member engages with the cartridge to separate the magnetic head from the disc, so that the magnetic head does not contact the disc.
You can prevent damage to the disc. Therefore, erroneous loading of the cartridge can be prevented.

By providing a position detector for detecting that the magnetic head has approached the disk, the disk is overwritten when it is detected, and the disk is overwritten when it is not detected. You can ban the lights.

[0011]

[Embodiment 1] FIG. 1 shows a disc 1 capable of overwriting.
2 shows a cartridge 2 in which a hard coat layer is coated on the disc 1 to protect the recording surface. The cartridge 2 is formed with a window 2c through which the magnetic head 10 comes into contact so that the disk 1 is exposed, and a groove-shaped cut-out is provided as an escape portion at the tip end portion in the loading direction to the main body (holder 3 described later). The notch 2a is formed. The cutout portion 2a is formed only for the cartridge 2 that accommodates the disc 1 that can be overwritten by magnetic modulation, and is not formed for a cartridge that is not suitable for overwriting.
Therefore, it is suggested that the cutout portion 2a is a cartridge accommodating an overwritable disc, and it is preferable to use a cartridge having no cutout portion 2a in a magnetic modulation type magneto-optical disk device. Absent.

FIG. 2 shows a state before the cartridge is loaded,
The holder 3 and the box-shaped base 5 constitute a main body, and a spindle motor 4 for rotating the disk 1 is provided at a predetermined position of the base 5. The optical head 6 for writing information on the disk 1 and the magnetic head 10 as a magnetic field generating means for performing magnetic field modulation are provided in the holder 3.
They are facing each other with (Disc 1) sandwiched from above and below,
The disc 1 can be moved integrally in the radial direction.
In this embodiment, the optical head 6 travels on a guide portion 5a such as a guide rail provided on the base 5, and the magnetic head 10 is connected to the optical head 6 via the arm 13 and the support base 8. The optical head 6 and the magnetic head 10 move together. Reference numeral 7 is an objective lens provided in the optical head 6.

The magnetic head 10 is attached to the tip of a gimbal 9 attached to the support base 8 and moves up and down by the rotation of the support base 8 to move toward and away from the disk 1. The gimbal 9 includes a plate portion 92 made of a rigid body and a plate spring 91. In order to rotate the support base 8, the support base 8 is rotatably attached to the arm 13 via the pin 16. A torsion coil spring 21 is attached to the pin 16.
One end of the torsion coil spring 21 is hooked on the arm 13 and the other end is hooked on the support base 8. This biases the support member 8 so that the magnetic head 10 moves in the direction of contact with the disk 1. is doing. Base 5 in support base 8
A protrusion 8a is formed on the side surface on the side. This protrusion 8a
Is provided below the pin 16 which is the rotation center of the support base 8, and when the projection 8a comes into contact with the base 5, the support base 8 rotates clockwise and the magnetic head 10 separates from the disk 1. To move up. The contact of the projection 8a with the base 5 is performed in conjunction with the movement of the optical head 6 to the outer peripheral side of the disk 1. A part of the gimbal 9 to which the magnetic head 10 is attached is bent downward so that a preload can be applied when the magnetic head 10 contacts the disk 1.

A cartridge 2 accommodating a disk 1 is removably inserted into the holder 3. A lever member 11 is rotatably mounted on the back side of the holder 3 in the cartridge insertion direction. The lever member 11 has an engagement protrusion 11a at a position corresponding to the cutout portion 2a of the cartridge 2, and a lift protrusion 11b at the end opposite to the engagement protrusion 11a. Engagement protrusion 1
Reference numeral 1a is to enter the notch 2a of the cartridge 2, and the engaging projection 11a does not interfere with the cartridge 2 by this entry, so that the lever member 11 does not rotate. On the other hand, the lift protrusion 11b is formed at a position where it can come into contact with the support base 8, and when the engagement protrusion 11a interferes with the cartridge 2 and the lever member 11 rotates, the support base 8 is pushed up, thereby causing the magnetic head 10 to move. Retreat upwards.

Reference numeral 15 denotes an arm 13 facing the support base 8.
It is a position detector mounted on the top. The position detector 15 detects the rotation of the support base 8 at the angular position of the base, and the rotation detection of the support base makes it clear that the magnetic head 10 is at the retracted position. When the rotation is detected, the write prohibit mode for the disk 1 is set, and when the rotation is not detected, the write enable mode is set.

FIG. 3 is a perspective view of the optical head 6 and its surroundings. A load plate 30 is provided below the holder 3 into which the cartridge 2 is inserted. The load plate 30 constitutes a part of a loading mechanism that loads the cartridge 2, and is movable relative to the holder 3 in the radial direction of the disc 1 (direction of arrow A). A lock lever 12 rotatably attached to the base 5 is provided on the front side of the optical head. The lock lever 12 extends in the direction of the optical head 6, and the rear end portion of the lock lever 12 on the side opposite to the extending direction toward the optical head 6 has a load plate 30.
And the tip end on the extension side is rotated by the reciprocal movement of the load plate 30 to come into contact with or separate from the optical head 6 (see FIGS. 4 and 5). The abutment of the lock lever 12 with the optical head 6 is performed when the disc is ejected,
This locks the optical head 6 in place.

The holder 3 is provided on the load plate 30. Sliding grooves 31 are formed on both side walls of the load plate 30, and the load pin 14 slidably inserted in the sliding groove 31 is mounted on the holder 3. It is provided on both sides. These load plate 30, sliding groove 31, and load pin 1
Reference numeral 4 constitutes loading means for displacing the holder 3 away from the optical head 6. The loading means sets the holder 3 when the load pin 14 is in the horizontal portion of the sliding groove 31 by the relative movement of the load plate 30,
When the slide groove 31 is on the inclined portion, the holder 3 is moved upward (that is, the holder 3 is moved away from the optical head 6).

FIG. 2 shows a state in which the cartridge 2 is not inserted, and the load plate 30 moves forward and the load pin 14 is positioned in the inclined portion of the sliding groove 31, so that the holder 3 is in the raised position. At the same time, the lock lever 12 comes into contact with and presses the optical head 6, so that the optical head 6 moves in a direction away from the holder 3. By this movement of the optical head 6, the projection 8a of the support base 8 is brought into contact with the side wall of the base 5, and the support base 8 rotates clockwise, whereby the magnetic head 10 moves to the retracted position. At this time, the position detector 15 detects the retracted state of the magnetic head 10 from the angle of the support base 8 against the bias of the torsion coil spring 21, and in such a state, the cartridge 2 is placed in the holder 3. It can be inserted smoothly.

FIG. 6 shows a flow chart of control of this embodiment. First, when the power is turned on, it is determined whether or not a disc (that is, a cartridge) is loaded (step S1). If the disc is loaded, the spindle motor 4 rotates (step S6). on the other hand,
Position detector 15 if no disc is loaded
Is at the retracted position of the magnetic head 10 (step S2), and it is determined whether the cartridge is inserted at the retracted position (step S4). If not, the loading mechanism is activated. Then, after moving the optical head 6 to the outer peripheral side (step S3), step S4
Proceed to. When the insertion of the cartridge is confirmed in step S4, the loading mechanism operates in the opposite direction,
The cartridge 2 (that is, the holder 3) is lowered (step S5), and then the spindle motor 4 is driven (step S6).

After that, the rotational speed of the spindle motor 4 is detected (step S7), and the position detector 15 causes the magnetic head 1 to move.
The position of 0 is detected (step S8). This position detection is performed as shown in FIGS. 4 and 5, which will be described later, and based on the detection result, the overwritable mode (step S9).
In addition, the mode shifts to the write prohibition mode (step S10).

FIG. 4 shows a loaded state of the cartridge 2 of the disc 1 which is not suitable for overwriting. Since the notch 2a (see FIG. 1) is not formed in the cartridge 2 of this disc, the front end portion of the cartridge 2 abuts on the engaging protrusion 11a of the lever member 11. As a result, the lever member 11 rotates, and the lift protrusion 11b pushes up the support base 8, so that the support base 8 rotates clockwise against the bias of the coil spring 21, and this causes the magnetic head 10 to rotate. Retreat upwards. Therefore, the magnetizing head 1
Since 0 does not contact the disk 1, even a disk with a weak protective film will not be damaged. Also, at this time,
Since the position detector 15 detects the rotation of the support base 8 and indirectly detects the retreat of the magnetic head 10, the write prohibit mode is set.

FIG. 5 shows an overwritable disc 1
2 shows the loaded state of the cartridge. Since the notch 2a is formed in this cartridge, the lever member 11
The engaging projection 11a does not enter the notch 2a and does not interfere with the cartridge. Therefore, the lever member 11
Does not rotate and the lift projection 11b does not push up the support base 8, so that the support base 8 rotates counterclockwise in accordance with the urging force of the torsion coil spring 21, and the magnetic head 10 moves to the recording surface of the disk 1. approach. At this time,
Since the position detector 15 does not detect the rotation of the support base 8, the contact of the magnetic head 10 with the disk 1 can be indirectly detected, and the writable mode is set.

Therefore, in the present embodiment described above, even if a disc that is not suitable for overwriting is erroneously loaded, the magnetic head automatically retracts from the disc, so that damage or destruction of the recording surface can be reliably prevented. .. Moreover, the magnetic head is not only erroneously operated on the disk which is not suitable for overwriting, but also retracts before loading and ejecting the disk, so that the magnetic head is not damaged.

In the above description, the notch 2a as the escape portion is formed in the overwritable disk cartridge, but this escape portion has a structure for preventing interference with the engaging projection 11a of the lever member 11. I wish I had it. Therefore, it is also possible to form a protrusion or the like that engages with the engagement protrusion 11a of the lever member 11 in a cartridge of a disc that is not suitable for overwriting, without forming a notch in the cartridge of a disc that can be overwritten. In this case, for example, by shortening the engagement protrusion 11a of the lever member 11, it is possible to escape interference from the overwritable disc cartridge.

[0025]

[Embodiment 2] FIG. 7 shows Embodiment 2 of the present invention, in which a groove 2b as an escape portion is formed in a window 2c of a cartridge 2 in which an overwritable disc 1 is exposed.
The groove 2b is formed on one end of the window 2c in parallel with the access direction. The magnetic head 10 that comes into contact with the disk 1 is attached to the support base 8 via the gimbal 9, and the gimbal 9 is formed with an engagement protrusion 20 extending in the groove portion 2b direction. In such a configuration, the gimbal 9
Since the engaging projection 20 of FIG. 2 enters into the groove 2b of the cartridge 2, the interference between the engaging projection 20 and the cartridge 2 is prevented. On the other hand, the groove portion 2b is not formed in the cartridge accommodating the disc that is not suitable for overwriting, so that the engagement protrusion 20 and the cartridge interfere with each other.

FIG. 8 shows the structure of the magneto-optical disk apparatus according to the second embodiment, and the same elements as those in the first embodiment are designated by the same reference numerals. In the second embodiment, the engaging protrusion 20
The gimbal 9 having the lever is the lever member 11 in the first embodiment.
The gimbal 9 is a lever member that supports the magnetic head 10 and displaces the magnetic head 10 in the direction of approaching and separating from the disk.

FIG. 9 shows a loaded state of a cartridge 2 which accommodates a disc 1 which is not suitable for overwriting, and the groove 2b (see FIG. 7) is not formed in this cartridge 2. Therefore, when the optical head 6 moves closer to the disk 1, the engaging projection 20 of the gimbal 9 contacts the window 2c of the cartridge 2, so that the magnetic head 10 moves toward the disk 1.
Cannot be approached, and the disk 1 is largely separated from the disk 1 and does not come into contact with the disk. This makes it possible to prevent the disc 1 having a weak protective film from being damaged.

FIG. 10 shows a loaded state of a cartridge 2 which accommodates an overwritable disc 1. Since the groove portion 2b as the escape portion is formed in the cartridge 2, the engagement protrusion 20 of the gimbal 9 is attached to the cartridge 2
The magnetic head 10 can approach the disk 1 without interfering with the disk 1 and can record information. In addition,
In these cases, the write prohibit mode is set in FIG. 9 and the writable mode is set in FIG. 10 based on the detection by the position detector 15, as in the first embodiment.

[0029]

As described above, according to the present invention, since the magnetic head automatically retracts from the disk when a disk that is not suitable for overwriting is loaded, it is possible to prevent the disk from being damaged or destroyed. Since the magnetic head retracts before loading the disk or at the time of ejecting, damage to the magnetic head can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of a cartridge according to a first exemplary embodiment of the present invention.

FIG. 2 is a side view of the first embodiment before loading a disc.

FIG. 3 is a perspective view of a loading mechanism.

FIG. 4 is a side view when a disc is loaded.

FIG. 5 is a side view when another disc is loaded.

FIG. 6 is an operation flowchart.

FIG. 7 is a perspective view of a second embodiment of the present invention.

FIG. 8 is a side view of the second embodiment before loading a disc.

FIG. 9 is a side view when a disc is loaded.

FIG. 10 is a side view when another disc is loaded.

[Explanation of symbols]

 1 Disk 2 Cartridge 2a Notch 6 Optical Head 10 Magnetic Head 11 Lever Member 11a Engagement Protrusion

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[Procedure amendment]

[Submission date] June 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

FIG. 2 shows a state in which the cartridge 2 is not inserted, and the load plate 30 moves forward and the load pin 14 is positioned in the inclined portion of the sliding groove 31, so that the holder 3 is in the raised position. At the same time, the lock lever 12 comes into contact with and presses against the optical head 6, which causes the optical head 6 to spin.
It moves away from the spindle motor 4 . By this movement of the optical head 6, the projection 8a of the support base 8 is moved to the base 5
Since it comes into contact with the rear side , the support base 8 rotates clockwise, and the magnetic head 10 moves to the retracted position. At this time, the position detector 15 detects the retracted state of the magnetic head 10 from the angle of the support base 8 against the bias of the torsion coil spring 21, and in such a state, the cartridge 2 is placed in the holder 3. It can be inserted smoothly.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

FIG. 4 shows a loaded state of the cartridge 2 of the disc 1 which is not suitable for overwriting. Since the notch 2a (see FIG. 1) is not formed in the cartridge 2 of this disc, the front end portion of the cartridge 2 abuts on the engaging protrusion 11a of the lever member 11. As a result, the lever member 11 rotates, and the lift protrusion 11b pushes up the support base 8, so that the support base 8 rotates clockwise against the bias of the coil spring 21, and this causes the magnetic head 10 to rotate. Retreat upwards. Therefore, the magnetic head 1
Since 0 does not contact the disk 1, even a disk with a weak protective film will not be damaged. Also, at this time,
Since the position detector 15 detects the rotation of the support base 8 and indirectly detects the retreat of the magnetic head 10, the write prohibit mode is set.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (2)

[Claims] 1. A main body into which a cartridge containing a rewritable disk is removably loaded, a magnetic head provided in the main body for overwriting the disk by magnetic field modulation, and overwriting is possible. A relief portion provided only in a cartridge containing a disc, and an engagement protrusion is formed at a position facing the relief portion of the cartridge, and the magnetic head is attached to the disc.
A lever member that engages with a magnetic head so as to be displaceable in a contacting / separating manner. While approaching and moving the magnetic head close to the recordable position of the disk, when the cartridge containing the disk that is not suitable for overwriting is loaded, the engagement protrusion engages with the cartridge to move the magnetic head away from the disk. A magneto-optical disk device characterized by the above. 2. The magneto-optical disk apparatus according to claim 1, wherein a position detector is provided in the main body for detecting that the magnetic head has approached the disk to a position where overwriting is possible.