JPH05325299A - Magnetic field modulation type magneto-optical disk device - Google Patents

Abstract

PURPOSE:To eject a disk to the outside of a device without damaging the disk while a magnetic head is separated from a disk cartridge in the case of erroneously loading the disk without a protective film. CONSTITUTION:Information whether or not the protective film is provided in order to protect a recording film is recorded on the innermost periphery of a medium which is set according to ISO standard. In the magnetic field modulation type magneto-optical disk device, the information recorded on the loaded disk is read by the magnetic head 4 while the magnetic head 5 is stopped at an upper position, and a CPU 10 discriminates whether or not the protective film is provided and discriminates whether or not the controlling for the up-and- down movement of the magnetic head is to be started, then, the up-and-down movement of the magnetic head is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overwritable magnetic field modulation type magneto-optical disk device having a magnetic head, and in particular, it is erroneously mounted when the magnetic head is separated from the disk cartridge when the disk cartridge is mounted. The present invention also relates to a magnetic disk device that can eject a recording medium having no protective film to the outside of the device without damaging it.

[0002]

2. Description of the Related Art In recent years, with the standardization of a recording medium and a cartridge case accommodating the same in the ISO standard,
There is an increasing possibility that different types of recording media having similar shapes may be inserted into the disk drive device due to an erroneous operation or the like.

As one of the overwriting methods using a magneto-optical disk, there is a magnetic field modulation type magneto-optical disk device. For example, in a 3.5-inch magneto-optical disk device configured as a parc type, a magnetic head (electromagnet) is provided at an interval of 2 to 3 mm on the disk to apply a bias magnetic field at the time of recording / erasing information. There is one that is arranged to face.

In this magneto-optical disk device, for example, as described in Japanese Patent Application No. 2-137196, the arm for supporting the magnetic head when the disk cartridge is mounted is separated from the magneto-optical disk surface to secure the space. As a result, the disk cartridge can be attached and detached without causing the disk cartridge to collide with the magnetic head.

On the other hand, in a magneto-optical disk apparatus constructed as a non-contact start / stop type, a magnetic head for magnetic field modulation is arranged so as to face the optical head and levitate at intervals of several μm or less on the disk. There is something.
The magneto-optical disk used in this magneto-optical disk device has a thickness of about 10 μm in order to prevent the disk from being scratched even if the magnetic head comes into contact when the disk is stopped, in other words, to protect the recording portion of the disk. A protective film is formed on the disk surface.

In this magneto-optical disc device, the recording portion of the disc is protected by the protective film when the disc cartridge is properly mounted. However, when the magnetic head is not retracted when the disc cartridge is attached or detached, the magnetic recording is performed as described above. The head approaches a very small interval of several μm or less on the disk. Therefore, it is necessary to retract the magnetic head to prevent collision between the magnetic head and the disk cartridge.

As a conventional example in consideration of the collision prevention,
For example, there is a magnetic field modulation type magneto-optical disk device disclosed in JP-A-3-73449. This conventional device is
It has a mechanism for preventing the collision by moving the magnetic head up and down when the disk cartridge is taken in and out.

[0008]

DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention
The conventional example of Japanese Patent Publication No. 49 is a magnetic field modulation type magneto-optical disk device, and is intended for collision prevention only for a recording medium having the recording film. Therefore, if a recording medium without a protective film is mistakenly inserted, it cannot be dealt with.In that case, the medium is protected when the disc cartridge is mounted, but once the disc cartridge is completely mounted, it is regarded as a normal recording medium. The magnetic head is brought close to the disk at a very small interval of several μm or less. For this reason, the medium cannot be protected, and the magnetic head may come into contact with the surface of the magneto-optical disk to cause damage.

The present invention has been made in view of the above circumstances. When a disk without a protective film is erroneously mounted, the disk is ejected to the outside of the apparatus without damaging the disk while keeping the magnetic head separated from the disk cartridge. It is an object of the present invention to provide a magnetic field modulation type magneto-optical disk device which can be realized.

[0010]

SUMMARY OF THE INVENTION The present invention is a magnetic field modulation type magneto-optical disk device of a magnetic field modulation type having a magnetic head and an optical head, the disk cartridge containing a disk as a recording medium. A magnetic head moving means for moving the magnetic head up and down when the disk is inserted, and means for mounting the disk having information on whether or not a protective film is formed on the surface of the disk,
Discrimination for discriminating whether or not the type of the disc mounted is suitable for the present device, based on the optical head moving means for moving the optical head to the area of the optical disc where the information is stored and the information read by the optical head. And means for instructing the magnetic head moving means to control the upward and downward movement of the magnetic head according to the determination result of the determining means.

[0011]

[Operation] For example, information as to whether or not a protective film is provided for protecting the recording film is recorded on the innermost circumference of the medium defined by the ISO standard. In the magnetic field modulation type magneto-optical disk device of the present invention, while the magnetic head is stopped at the upper position, the above-mentioned information on the mounted disk is read by the optical head, and the discriminating means determines whether the medium type is a protective film or not. Then, it is determined whether or not the control of the upward / downward movement of the magnetic head is started according to the presence / absence of the protective film, and then the up / down movement of the magnetic head is controlled. At this time, if the discriminating result of the discriminating means is a disc having no protective film, the disc is erroneously mounted, and thus the disc is ejected to the outside of the apparatus without damaging the disc while keeping the magnetic head separated from the disc cartridge.

[0012]

1 and 3 relate to a first embodiment of the present invention,
FIG. 1 is a block diagram showing the configuration of a magnetic field modulation type magneto-optical disk device, and FIG. 2 is a flow chart showing the operation when the disk cartridge is attached or detached.

A recording medium such as a magneto-optical disk has a data area composed of a plurality of tracks (not shown) on which a user can overwrite information, and a PE on the inner circumference of the data area.
It has a P area (control track area).
In the disk device, the reading and writing of the recording medium can be optimized by the information written in the PEP area.

In the ISO standard, the sample beam method is standardized in the continuous servo method because the light beam seeks the track of the medium. And the PE
Information recorded in the P area is low frequency phase modulation (P
EP = Phase Encoded Part) A digital code by recording or a bar code is displayed, and includes information regarding the presence or absence of a protective film on the medium.

A read-only disk (ROM disk) and an overwritable magneto-optical disk (MO)
In the case of (1), a protective film is provided on the surface of the disk, but in the case of a normal magneto-optical disk or a disk other than the magneto-optical disk, a disk without a protective film is general.

FIG. 1 shows only the disk drive section of the magnetic field modulation type magneto-optical disk apparatus and its drive system and control system, and the illustration of the optical system and the like is omitted.

This magnetic field modulation type magneto-optical disk device 11
Is a loading mechanism 3 for moving the disc cartridge 2 accommodating the magneto-optical disc 1 to mount the disc cartridge 2 inside the device (on a spindle motor) or eject the disc cartridge 2 to the outside of the device.
The optical head 4 and the magnetic head 5 that face each other across the magneto-optical disk 1 are integrally moved in the radial direction of the disk (indicated by an arrow A on the left and right sides of the drawing) to form a servo mechanism 6 (not shown, but not shown). When the magnetic head 5 and the magnetic head 5 are separately synchronized and moved in the disk radial direction, the moving mechanism of the magnetic head 5 operates left and right (A) and up and down (B)).
And a magnetic head moving mechanism 7 for moving the magnetic head 5 in a direction perpendicular to the disk surface of the magneto-optical disk 1 (indicated by an up and down arrow B in the figure). Further, the magneto-optical disk device 11 uses the spindle motor 8 for rotating the magneto-optical disk 1 as indicated by the arrow in the figure, and the optical head 4 for the information for discriminating the type of medium recorded in the PEP area of the magneto-optical disk 1. An amplifier 9 for amplifying the read and output signal, and a CPU 1 for inputting various signals from the respective constituent elements and controlling the operation of these respective constituent elements.
It has 0 and.

The magneto-optical disk 1 in the disk cartridge 2 is driven by a spindle motor 8 and the CPU
The command of 10 identifies that the magneto-optical disk 30 has been installed, and moves to the innermost circumference of the disk by driving a linear motor (not shown). In this state, focus control is applied, and the output of the semiconductor laser in the PEP region located at the innermost circumference of the disc is controlled by a laser drive circuit (not shown). When reading this PEP area,
The light beam is emitted with the minimum light power so as not to destroy the medium. Information recorded in the PEP area is recorded in the optical head 4
Read out in step S6, output as an electric signal, amplified by the preamplifier 9, and the output signal is identified by the CPU 10 to confirm whether or not the disc has a protective film.

(1) When the disk has a protective film, the magnetic head 5 is moved downward, and the output of a magnetic head position detector (not shown) causes the medium and the magnetic head 5 to move to, for example, 10.
Positioned so that it is about μ.

Since the magneto-optical disk device of this embodiment is constructed as a magnetic field modulation type, it is obvious that an overwritable magneto-optical disk can be recognized as a normal object, but a ROM disk can be recognized. In order to be recognized as a legitimate target, the magneto-optical disk and the ROM disk are shared.

(2) If the disk has no protective film, the eject operation is started immediately, the cartridge is ejected, and it is determined whether or not the cartridge is ejected.

The operation of the apparatus will be described with reference to the flowchart of FIG. First, when turning on the power of the device,
In preparation for the mounting of the disc cartridge, the servo mechanism 6 is driven by an instruction from the CPU 10 to position the optical head 4 at the outermost periphery of the disc. An out-guard detector (not shown) is arranged at the outermost position of the optical head 4, and the optical head 4 stops at this position. In steps S1 and S2, it is detected whether or not the outermost circumference has been reached, and if not reached, the optical head 4 is moved to reach it. After the power is turned on, the magnetic head 5 is initially moved upward and fixed.

Next, the disk cartridge is mounted. Whether or not the cartridge is mounted in the apparatus shown in step S3 is detected by, for example, a mechanical switch (not shown). If not installed, it is in a standby state. When mounted, the spindle motor 8 is rotated at a predetermined rotation speed in step S4, and the semiconductor laser (not shown) which is the light source of the optical head 4 is turned on in step S5. Next, the focus servo is turned on in steps S6 and S7, and the optical head is positioned at the innermost circumference in step S8.

Then, in steps S9 and S10, PE
The information in the P area is read to determine the type of medium. PE
By reading the information in the P area via the amplifier 9, the CP
U10 can recognize the type of medium. That is, it is recognized whether it is a normal magneto-optical disk, a disk other than the magneto-optical disk, a ROM disk, or an overwritable magneto-optical disk.

In the case of a medium other than ROM and MO, that is, a medium without a protective film, it is displayed in step S11 that it is a recording medium without a protective film. As a display, an error message indicating that reproduction is not possible may be displayed, or the medium has no protective film (or
Other than ROM and MO) may be displayed. Alternatively, the name of the type of medium may be displayed. The display can be displayed on the front panel of the device as needed, and the display position and means are not limited as long as the user can visually confirm the display.

On the other hand, in the case of a medium having a protective film, in step S12, the magnetic head 5 is controlled to determine whether or not it can be moved downward. In the case of Yes, that is, since the mounted medium is an overwritable magneto-optical disk, in step S13, the magnetic head 5 is moved downward through the magnetic head moving mechanism 7 to move the magnetic head 5 to the disk of the disk cartridge. Bring them close together. At this time, the output from the magnetic head position detector positions the magneto-optical disk 1 and the magnetic head 5 so that the distance between them is about 10 μm. Then, after positioning, recording / reproduction is possible as shown in step S13A. That is, information is written or read in the data area of the magneto-optical disk 1 according to the instruction of the CPU 10.

If No in step S12, it is determined in step S14 whether or not the disc is a ROM disc, and Yes is determined.
In the case of, it moves to step S15. In step S15, since the mounted medium is discriminated as a ROM disc, the magnetic head control remains OFF and reproduction is possible.

On the other hand, if the disc is not a ROM disc, the process proceeds to step S16 and the disc cartridge ejecting operation is started. In steps S16 to S18, the focus control is turned off and the semiconductor laser of the optical head 4 is turned off.
Then, the CPU 10 gives an instruction to turn off the drive of the spindle motor 8. Then, in step S19,
It is determined whether the rotation of the spindle motor 8 has stopped. If it is not stopped, it will be in a standby state until it is stopped. Then, when stopped, the optical head 4 is moved to the outermost periphery of the disk 1 in preparation for ejection, and it is determined in step S20 whether or not the outermost periphery has been reached. When reaching the outermost circumference, in step S21, the mounted medium is a disk other than ROM and MO, and the disk cartridge is ejected.

At the innermost circumference of the recording medium defined by the ISO standard, information as to whether or not the protective film is provided to protect the recording film is recorded by a digital code or a bar code. This magneto-optical disk device irradiates the mounted medium with a light beam to the innermost area with a minimum optical power in order to prevent the medium from being destroyed while the magnetic head is stopped,
The drive control identifies the information and determines whether or not to start the control of the upward / downward movement of the magnetic head, and then controls the upward / downward movement of the magnetic head.

Thus, in the apparatus of this embodiment,
The magnetic head, which is arranged opposite to the optical head, starts moving up and down so as not to scratch the magneto-optical medium without the protective film and not to scratch the medium when the disk cartridge is taken in and out. By determining whether or not there is a protective film on the recording medium,
A stable operation can be performed when the cartridge is taken in and out and without colliding with the medium. Then, in the present apparatus, the magnetic head moving mechanism 7 keeps the magnetic head 5 away from the magneto-optical disk surface while the disk cartridge is mounted, and in the case where the discriminating result is a disk without a protective film, it is separated from the disk surface. The disc is ejected in this state. Therefore, the present apparatus can be ejected to the outside of the apparatus without damaging the mounted recording medium having no protective film.

The determination of whether or not the disk has a protective film will be described below as a modification of the first embodiment.

In the first embodiment, digital code information or the like is recorded in the PEP area depending on whether or not the disk has a protective film. On the other hand, in the present modified example, the cartridge set sensor 19 indicating whether or not the cartridge according to the related art (Japanese Patent Laid-Open No. 3-73449) is normally set.
Is a photoreflector in which a light-receiving / light-emitting element is integrated, and the shape of the notch of the cartridge on the opposite surface of the sensor 19 at the time of insertion is made different, thereby detecting the presence or absence of the cartridge from the output of the light-receiving element and protecting The configuration is such that the presence / absence of a film is determined at the same time.

In this modified example, the disc can be discriminated without moving the linear motor to the PEP area, starting the rotation of the spindle motor, and confirming the focus control state. At the same time as the destruction of the medium due to the contact with the magnetic head that has moved downward, P
During seek control in the EP region, it is possible to prevent medium destruction due to abnormal laser output.

FIG. 3 is an external view of the disk cartridge. As shown in FIG. 3B, the disc cartridge 3
The cartridge case 31a of No. 1 is the magneto-optical disk 30.
While having the inside, it has a movable part 32. When the disc cartridge is inserted into the device, the movable portion 32 moves in the direction of arrow X to open the recording / reproducing window. The stored magneto-optical disk 30 is exposed from the recording / reproducing window.

Further, the cartridge case 31a is provided with a small hole 33 as an identification means for determining whether or not the magneto-optical disk has a protective film. This small hole 33
As shown in the drawing, it is provided on one side of the cartridge case 31a. A write permission / prohibition marker 34 is provided adjacent to the small hole 33, and a medium identifier 35 functioning as a switch for identifying the type of the magneto-optical disk is provided in the vicinity. The medium identifier 35 can identify the type of disc by opening / closing four holes, for example.

On one side of the cartridge case 31a,
Although the small hole 33 is newly provided on the magneto-optical disk to determine whether or not the protective film is provided, an unused hole among the four holes of the medium identifier 35 may be used. In this case, the small hole 33 is omitted. it can. In the case of an identifier, for example, in the case of 5.25 inches, since the ISO standard identifiers 33 and 34 are reserved, one identifier may be used to provide a function of presence or absence of a protective film. ..

The apparatus of this embodiment is provided with a light detecting means, a mechanical contact switch or the like in place of the optical head 4 of the first embodiment shown in FIG. 1, and the detecting means has a different shape when the disk cartridge is inserted. The small hole 33 is detected.
By this detection, it is possible to determine whether or not the disk cartridge 31 is inserted and whether or not the protective film is present in the disk device.

At this time, it is not preferable to use a reflection marker as the identification means, because the reflectance may be different due to dust, scratches, etc. due to handling and erroneous detection may occur.

[0039]

According to the magnetic field modulation type magneto-optical disk device of the present invention, when a disk without a protective film is erroneously mounted,
There is an effect that the magnetic head can be ejected to the outside of the apparatus without damaging the disk with the magnetic head kept away from the disk cartridge.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a magneto-optical disk device according to a first embodiment.

FIG. 2 is a flowchart showing an operation when a disc cartridge is attached or detached.

FIG. 3 is an external view of a disc cartridge.

[Explanation of symbols]

 1 ... Magneto-optical disk 2 ... Disk cartridge 3 ... Loading mechanism 4 ... Optical head 5 ... Magnetic head 6 ... Servo mechanism 7 ... Magnetic head moving mechanism 8 ... Spindle motor 9 ... Amplifier 10 ... CPU

Claims (1)

[Claims] 1. In an overwritable magnetic field modulation type magneto-optical disk device having a magnetic head and an optical head, the magnetic head is moved up and down when a disk cartridge containing a disk as a recording medium is inserted. A moving magnetic head moving means; a means for attaching / detaching the disk having information on whether or not a protective film is formed on the surface of the disk; and an optical head for the area having the information on the optical disk. An optical head moving means for moving the magnetic head, a discriminating means for discriminating whether or not the type of the mounted disc is suitable for the present device based on the information read by the optical head, and A magnetic field characterized by having an instruction means for instructing the head moving means to control the upward and downward movement of the magnetic head. Modulation type magneto-optical disk device.