JPH05198031A - Magnetooptical disk device and magnetooptical disk cassette used therefor - Google Patents

Abstract

PURPOSE:To reduce the size and price of the magnetooptical disk device by bringing a mechanical contact type sensor into contact at a feature part in a shape provided to the disk cassette and controlling the retraction of a magnetic head. CONSTITUTION:A disk cassette holder 20 is equipped with the mechanical contact type sensor consisting of a leaf spring 11 which detects the kind of a magnetooptic disk 40. When the disk cassette 30 which contains the magnetic field modulation type magnetooptic disk is loaded in the holder 20, the engagement element IIB of the leaf spring 11 is engaged in a through hole 33 and the spring 11 swings around a fulcrum member 11 to swing a swing member 1 through an interlocking engagement member 1B. Consequently, the magnetic head 2 is set opposite the disk surface across a torsion spring 15. When a cassette 30' containing an optical modulation type magnetooptic disk is loaded, the engagement element 11B is pressed up by the wall 34 of the groove hole 33' of the cassette 30', the member 1 is rotated by the extension part of the spring 11, and an engagement member 3A is pushed up to retract the head 2.

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 which can be overwritten by a magnetic field modulation method, a magneto-optical disk of a light modulation method, and a magneto-optical disk device which can be used in combination with a ROM disk, and a magneto-optical disk cassette used therefor. It is about.

[0002]

2. Description of the Related Art In this type of magneto-optical disk device, when recording is performed on a magneto-optical disk corresponding to this by a magnetic field modulation method, the magnetic head is moved to the disk medium film from the relationship between the modulation frequency and the generated magnetic field. The gap defines the modulation frequency, which is no different from the conventional induction type magnetic recording system. Therefore, it is the simplest known means to hold the magnetic head by using the floating slider that utilizes the dynamic pressure of air generated by the rotation of the disk. In this case, in the magneto-optical disk, it is necessary to form the disk surface corresponding to the sliding surface of the floating slider with high surface accuracy.

On the other hand, however, in a magneto-optical disk or a ROM (embossed pit reflectance change) disk used for recording of an optical modulation method (intensity modulation of laser light), the above-mentioned floating slider is attached to the disk surface. However, if a magnetic head using a floating slider is loaded as it is to apply a bias magnetic field, the recording film on the disk surface and the sliding surface of the floating slider will be damaged. May occur.

Therefore, in the above-mentioned magneto-optical disk apparatus, as described below, when the non-magnetic field modulation type disk is reproduced, the floating slider is retracted from the disk surface of the magneto-optical disk and used. .. That is,
As shown in FIGS. 37 to 39, the conventional magneto-optical disk device includes an optical head for recording by the magnetic field modulation method, a magnetic head corresponding to this, and a retracting mechanism thereof. Here, both the optical head 103 and the magnetic head 104A mounted on the carriage 102 are designed to be simultaneously seek-moved by the seek motor 101.

The magnetic head 104A is mounted on a floating slider 104, and this slider 104 is a magnetic head flip-up mechanism 105 so that the magnetic head 104A can be retracted upward from the disk surface of the magneto-optical disk 108. .. That is, the magnetic head repelling mechanism 105 pivotally supports the rotating member 111 with the support shaft 112 disposed on the carriage 102 as a rotating shaft, and engages and abuts on the rotating member 111. Part 10
By pressing 6 with the pressing biasing member 107 of the magnetic head retracting drive unit, the rotating member 111 can be rotated around the support shaft to retract the magnetic head 104A.

The magneto-optical disk 108 is housed in a disk cassette 110, rotated by a spindle motor 120 in the loading section of the magneto-optical disk apparatus, and recorded on the disk surface by irradiation of a laser beam by the optical head 103. Form a light spot for reproduction. With respect to the loaded magneto-optical disk, the joint sensors 115 and 116, each of which has a configuration such as a microswitch or a photointerrupter, for detecting the type of the disk, confirming the loading of the disk cassette, and detecting the write-inhibit state, respectively. It is arranged on the chassis of the disk device. The carriage 102
An engaging portion 109 is provided on the rotating member 111, and an engaging member 109 for defining the loading position of the magnetic head is provided on the rotating member 111.

FIG. 37 shows a state in which the disc cassette 110 is not mounted in the loading section. Here, the joint sensor 115 for disc type detection, disc cassette loading confirmation, and write protection detection is shown.
And 116 do not output the detection signal, respectively. In this state, the magnetic head retracting drive unit is in a non-driving state and holds the pressing biasing member 107 in a lowered state. Therefore, the pressing biasing member 107 presses the engaging contact portion 106, The magnetic head 104A is retracted upward.

FIG. 38 shows a state in which an overwritable magneto-optical disk compatible with the magnetic field modulation method is loaded. Here, for example, the loading of the disk cassette 110 is detected by the joint sensor 116 and the disk cassette is detected. Detected portion 1100 for disc type provided in 110
(See FIGS. 37 and 38) is detected by the joint sensor 115, and as a result, a command is issued from the control system to rotate the spindle motor 120.

In this case, the pickup of the optical head 103 is used to read the information on the disk surface, and the control system determines whether or not the disk is for magnetic field modulation. If it is a disk for magnetic field modulation, the magnetic head retract drive unit is driven to raise the pressing bias member 107. As a result, the engagement contact portion 106 is released from the pressing force.
In this case, the rotating member 111 biases the carriage 102 in the magnetic head loading direction by a spring (not shown).
Has been done. Therefore, the rotating member 111 is attached to the support shaft 11
It rotates about 2, and the locking member 109 comes into contact with the locking portion 109 to complete the loading of the magnetic head 104A.

FIG. 39 shows a state in which a ROM disc or a magneto-optical disc 108 for optical modulation is loaded. In the case of a ROM disc, for example, the joint sensors 115 and 116 output detection signals. In the case of a magneto-optical disk compatible with the optical modulation method, the optical head 103
The pickup picks up the information on the disc surface and the control system determines the disc type. On the basis of the result, the magnetic head retraction drive unit operates according to the command from the control system to hold the pressing biasing member 107 so as to continue the retracted state, so that the magnetic head 104A is not loaded. In this case, since the pressing urging member 107 extends in the seek direction of the carriage 102, even if the carriage 102 performs a seek operation and a tracking operation, the engaging contact portion 106 causes the pressing urging member 106 to operate. Since the magnetic head 104A is continuously rolling and slidingly contacting with 107, the unload state of the magnetic head 104A is maintained.

[0011]

However, in the above-mentioned conventional magneto-optical disk device, when the magnetic head corresponding to the magnetic field modulation system is driven by the other modulation system, the following mechanism is provided for retracting the magnetic head. It has such drawbacks. That is, since the magnetic head for magnetic field modulation for the magneto-optical disk and the disk cassette is retracted through the same retracting mechanism, the retracting amount of the magnetic head becomes large, and the retracting drive means (for example, solenoid type plan) is used. The movable stroke range and generated force of the jar) increase, and inevitably increase in size. Further, since the carriage moves in the same direction during the seek operation of the optical head, the pressing biasing member 107 arranged behind the disk cassette needs to extend in the depth direction of the apparatus.
Therefore, the space occupied by the magnetic head retracting mechanism for magnetic field modulation in the magneto-optical disk device becomes excessive and expensive, which presses the mounting space of electric circuits such as signal processing and various control circuits, and This makes it difficult to reduce the size and cost of the disk device.

Further, the means and mechanism for discriminating the magnetic field modulation type magneto-optical disk in the magneto-optical disk apparatus are as follows:
It has the following drawbacks. In other words, the optical head pickup reads information from the magneto-optical disk,
It is possible that the disc information may be destroyed if there is a difference in the number of revolutions of the disc and the laser power at the time of recording / reproducing when the control system makes a predetermined determination. Or
It takes a lot of time (startup) until the reproduction information is obtained after the above conditions are met.

Further, since the means for judging the type of the disk can be obtained only from the reproduction signal, it is necessary to perform the retracting operation of the magnetic head by the drive source (motor, solenoid, etc.) which can be driven by the electric signal. Therefore, the designing range of the retracting means of the magnetic head is narrowed.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a disc cassette of a magneto-optical disc to be used is provided with a to-be-detected portion having a desired uneven shape and the like, and a loading portion of an apparatus corresponding thereto is provided. A mechanical contact type sensor is installed in
Magneto-optical disk device capable of directly detecting a characteristic shape of a disk cassette and mechanically or by using a conventional electric control system to provide a retracting operation of a magnetic head, and use thereof The present invention intends to provide a magneto-optical disk cassette that can be used.

[0015]

Therefore, according to the present invention,
By irradiating the disk surface of the magneto-optical disk with laser light, information can be written and read magneto-optically.
An optical head that can move in the seek and tracking directions is arranged corresponding to the disk surface, and a magnetic field modulation type magnetic head that faces the optical head is mounted on a flying slider with the magneto-optical disk sandwiched between them. In a magneto-optical disk device that is linked with the optical head, a mechanical contact type sensor is used so that loading / unloading of the magnetic head with respect to the disk cassette is synchronized with the mounting means of the disk cassette in the loading section. The mechanical contact operation of the sensor is performed by the characteristic portion of the shape provided on the disk cassette, and the mechanical operation of the sensor causes the holding member for holding the magnetic head. It is configured to control mechanical means for moving up and down with respect to the retracted position of the magnetic head.

Further, according to the present invention, an optical head capable of moving in the seek direction and the tracking direction so as to write and read information magneto-optically by irradiating the disk surface of the magneto-optical disk with laser light is used. A magnetic field modulation type magnetic head facing the optical head is mounted on a flying slider with the magneto-optical disk sandwiched between the magnetic head and the magnetic head so as to interlock with the optical head. In a disc cassette used in a disc device, when the magnetic head is inserted into a loading window of the magneto-optical disc device and the magnetic head is inserted into a head window provided in a cassette shell, In order to determine the loading / unloading operation, the concavo-convex shape to engage the members on the magneto-optical disk device Characterized by being installed to be added or removed on the upper and lower surfaces or side surfaces of the cassette shell.

[0017]

【Example】

(First Embodiment) An embodiment of the magneto-optical disk device according to the present invention will be specifically described below with reference to FIGS. Here, the optical head (optical pickup) 6 and the magnetic head 2 mounted on the carriage 10 simultaneously perform a seek operation along the guide rail 8 by the linear motor 9 as in the conventional case. Therefore, the magnetic head 2 is mounted on a floating slider, and the slider is supported by the magnetic head holding member 3 via a load beam 4 composed of a leaf spring, and the holding member 3
Can rotate about a support shaft 12 provided on the carriage 10 as a rotation shaft, and is constantly urged toward the carriage 10 by a torsion spring 15 to load / load the magnetic head 2 on the disk surface. Can be moved in the unload direction. The carriage 10 is equipped with a stopper 7 that regulates the rotation amount of the holding member 3 in order to maintain a predetermined gap between the magnetic head and the magnetic head when the magnetic head approaches the disk surface. Further, a disc cassette holder 20 is arranged in the loading section of the magneto-optical disc device, and the disc cassette 30 inserted therein is held and lowered to mount the magneto-optical disc 40 on the spindle motor 80. It is like this.

Then, the disc cassette holder 2
0 is a mechanical contact type sensor for detecting the type of the magneto-optical disc 40 corresponding to the characteristic portion of the shape provided in the inserted disc cassette 30, for example, the uneven shape (described later) formed there. It is equipped. The sensor is
An engaging abutting member that engages in correspondence with the above-mentioned concavo-convex shape, in this embodiment, is composed of an L-shaped leaf spring 11, one end of which is fixed to the disc cassette holder 20 by a fixing pin 1
1A or the like, the intermediate bending portion is provided with a pin-shaped engaging element 11B, and the other end side portion extends to the magnetic head retracting mechanism (described later) side, and the intermediate portion is a fulcrum. The structure is such that it is swingably supported by a member 11C (which is mounted on the disc cassette holder 20).

The main part of the magnetic head retracting mechanism is the disk cassette holder 2 in this embodiment.
0 is composed of a plate-like rocking member 1 which is rockably supported by a pivot shaft 1A, and the other end of the leaf spring 11 is inserted into one end of the rocking member 1. A slit-shaped interlocking engagement portion 1B is provided. Further, the other end of the swinging member acts as a locking portion that pushes up the holding member 3, and correspondingly, the holding member 3 makes rolling contact with the locking portion. A roller-type engagement member 3A is provided.

With such a structure, when the disc cassette holder 20 is lowered to the loading portion of the apparatus (see FIG. 1),
The magnetic head 2 and the load beam 4 are held in a state of penetrating into the head window (head insertion window) of the disk cassette 30. In this case, the load state of the magnetic head 2 on the magneto-optical disk depends on whether it is an ISO standard magneto-optical disk corresponding to the optical modulation method or a magneto-optical disk corresponding to the magnetic field modulation method. Is determined by. In this case, the type of the magneto-optical disk corresponding to each system can be identified by the characteristic portion of the disk cassette that houses it, that is, the uneven shape in the above embodiment.

FIG. 8A shows a disk cassette 30 of the magnetic field modulation type magneto-optical disk. Here, a detected portion 33 is formed in the form of a through groove on the side of the slide 32 for the shutter 31 (this is originally a groove 33 'not provided in the thickness direction, which is provided for autoloading and is not penetrated). It is in the form of piercing through). Further, in the disk cassette 30 ′ of the light modulation type magneto-optical disk, unlike the magnetic field modulation type disk cassette 30 ′ shown in FIG.
As shown in (b), a wall 34 is provided beside the slide 32 'for the shutter 31' so as to close the groove 33 '(the original auto-loading groove 33').
There is a shape).

Therefore, as shown in FIGS. 3 and 4, when the disc cassette 30 incorporating the magnetic field modulation type magneto-optical disc is loaded in the disc cassette holder 20, the disc cassette 30 is covered with the disc cassette 30. Detection unit 3
3 has the shape of the through groove, so that the engaging element 11B biased to the disk cassette 30 side by the elastic force of the leaf spring 11 descends into the detected portion 33 and engages with it. Therefore, the leaf spring 11 swings around the fulcrum member 11C, and swings the swinging member 1 through the interlocking engaging portion 1B. Therefore, when the disc cassette 30 is lowered and the disc is set on the spindle motor 80, the locking portion is lowered in the direction away from the engaging member 3A, and the engaging member 1B collides with the stopper 7. It rotates about the pivot shaft 1A by the action of the torsion spring 15 until it comes into contact with the magnetic head 2 and the levitation slider which mounts the magnetic head 2 through a predetermined interval (a gap slightly larger than the surface vibration amplitude of the disk). , Faces the disk surface of the magneto-optical disk. In this way, information can be recorded magneto-optically on the magneto-optical disk by the magnetic field modulation method.

The magnetic head 2 is the optical head 6
While being held by the carriage 10 together with the carriage 10 and moved in the seek direction and the tracking direction at the same time, the engaging member 3A is shaken so as to maintain the contact state with the engaging portion of the swinging member 1. The width of the moving member is set large to correspond to the maximum tracking stroke.

Further, the disc cassette holder 20
When the disk is released from the spindle motor 80, the engaging member 3A hits the rocking member 1 and is pushed up by the lifting of the disk cassette holder 20 to rotate the magnetic head holding member 3. The magnetic head 2 is retracted above the head window of the disk cassette 30.

Further, as shown in FIGS. 5 and 6, when a disc cassette 30 'containing a light modulation type magneto-optical disc is loaded in the disc cassette holder 20, the disc cassette 30' is described. Since the detected portion of the disc is not a through groove (the slot 33 ′ is closed by a wall), the engaging element 11B is pushed upward on the upper surface of the disc cassette, and therefore the leaf spring 11 is
The fulcrum member 11C is swung around, and the swinging member 1 is swung by its extension. As a result, the engaging member 3A is pushed up by the end of the swinging member, whereby the magnetic head 2 and the floating slider on which the magnetic head 2 is mounted can be retracted upward. Then, a magnetic head (not shown) that generates a constant bias magnetic field, which is used in the optical modulation method, can be accessed on the empty disk surface.

(Second Embodiment) The sensor and the magnetic head retracting mechanism may be configured differently as shown in FIGS. 7 (a) and 7 (b). Here, the leaf spring 11 as a sensor is simply pivotally supported by a pivot shaft 11D, and an engaging element 11B is attached to one end of the leaf spring 11 via an elastic portion 11E having an arc shape. The other structure is similar to that of the first embodiment. In this case, due to the function of the elastic portion 11E, the engagement element 11B is elastically biased so as to be pressed against the upper surface of the cassette. Then, the optical modulation type magneto-optical disk cassette 30 'is a disk cassette holder 2
If it is loaded in 0, as shown in FIG. 8A, the engaging member 3A is pushed up by the locking portion of the swinging member 1, the magnetic head 2 is retracted upward from the disk surface, and the magnetic field is increased. When the modulation type magneto-optical disk cassette 30 is loaded in the disk cassette holder 20, as shown in FIG. 8B, the locking portion of the swinging member 1 is lowered to bring the magnetic head close to the disk surface. Can be made

The characteristic portion of the disk cassette in the above-mentioned first and second embodiments, that is, the concavo-convex shape, may have various forms other than that shown in FIG.
In this case, the portion forming the detected portion 33 is set to a portion excluding the label attachment area and the shutter slide area of the disc cassette. In addition, as for the uneven shape, a simple groove or hole is mainly preferable.

(Third Embodiment) Next, a third embodiment of the present invention will be specifically described with reference to FIGS. 9 to 15. Here, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 9 shows a loading completed state in which the magnetic field modulation type disc cassette 30 is loaded into the disc cassette holder 20 and the disc cassette holder 20 is lowered. Here, a lever 19 for opening and closing the shutter is provided on the disc cassette holder 20.
Is rotatably attached via a pivot shaft 19A,
An opening / closing operator 22 is provided at the tip thereof. The opening / closing operator 22 is pushed by the front edge of the disc cassette 30 in the process of inserting the disc cassette 30 into the disc cassette holder 20 and is pushed by the slide 32 while being guided by the slit 23. It works to open the shutter 31. Further, here, the mechanical contact type sensor 5 for discriminating the type of the magneto-optical disc has an engaging element 5A at one end, and the other end 5C is opposed to one end of the swinging member 1 in the vertical direction, and Axis 5 in the middle
B is swingably supported on the disc cassette holder 20 by B, and the torsion spring 17 is provided there.
Thus, the engaging element 5A is biased downward. The position where the engaging element 5A faces the disc cassette 30 is
It is the position where the shutter 31 has just been opened and slid. In addition, in the above-described embodiment, the swinging member 1 is eccentrically rotated in the direction of separating the locking portion from the engaging member 3A by the action of the torsion spring 17A.

The characteristic portion of the magnetic field modulation type disk cassette 30 used in this magneto-optical disk device is shown in FIG.
As shown in (a), the groove 33 is formed on the front edge of the shutter 31. On the other hand, the optical modulation type disk cassette 30 'used in the same magneto-optical disk device does not have a groove in the shutter 31' as shown in FIG. 15 (b).

With such a structure, when the magnetic field modulation type disc cassette 30 is loaded in the disc cassette holder 20, at the stage when the opening of the shutter 31 is completed,
Since the engaging element 5A descends and engages in the groove 33, the engagement between the sensor 5 and the swinging member 1 is released, so that the disc cassette holder 20 descends and the disc is rotated by the spindle motor. At the stage of setting on the disk 80, the engaging member 3A is not pushed up by its locking portion, so that the magnetic head 2 and the load beam 4 are inserted into the head window (head insertion window) of the disk cassette 30, The magnetic head 2 faces the disk surface with a predetermined gap maintained.

Further, the disc cassette holder 20
When the disk is released from the spindle motor 80, the engaging member 3A hits the rocking member 1 and is pushed up by the lifting of the disk cassette holder 20 to rotate the magnetic head holding member 3. The magnetic head 2 is retracted above the head window of the disk cassette 30.

On the other hand, the light modulation type disk cassette 30 '
When the disk cassette holder 20 is loaded into the disc cassette holder 20, the shutter 31 does not have the groove 33 even when the shutter 31 is completely opened, so that the engagement element 5A is supported by the shutter 31. The engagement with the rocking member 1 is retained. Therefore, even when the disc cassette holder 20 is lowered and the disc is set on the spindle motor 80, the engaging member 3A is pushed up by the engaging portion, and the magnetic head 2 and the load beam 4 are moved to the disc cassette. It is retracted outside the head window of 30 '. Therefore, a magnetic head (not shown) of the optical modulation type which applies a constant bias magnetic field through the head window can access the disk surface.

(Fourth Embodiment) Next, a fourth embodiment will be described with reference to FIGS. Here, a mechanical structure in which the sensor 5 and the swinging member 1 are integrated is shown. That is, the engaging element 5A of the sensor 5 is provided so as to project to the lower side of the swinging member 1, and this is provided through the opening 20A formed in the cassette holder 20.
It faces the disk cassette 30 or 30 '.
The urging force that presses the engaging element 5A toward the disc cassette side is provided by also using the torsion spring 17A that urges the swinging member 1.

With such a structure, when the cassette holder 20 is loaded with a disc cassette 30 'of a normal optical modulation type magneto-optical disc, as shown in FIG. 18 and FIG. The engagement element 5A is pushed up, and the rocking member 1 presses the engagement member 3A upward (as indicated by an arrow in FIG. 19) at its locking portion. Therefore, even when the loading of the disc cassette 30 'is completed, the magnetic head 2 of the magnetic field modulation type and the load beam 4 supporting the magnetic head 2 are held in the retracted state (FIG. 18).
reference).

When the disc holder 30 of the magnetic field modulation type magneto-optical disc is loaded in the cassette holder 20, as shown in FIGS. 16 and 17, the engaging element 5A is inserted into the groove 33 formed in the shutter 31. Is inserted, so that the rocking member 1 separates its locking portion from the engaging member 3A (see FIG. 17). Therefore, when the loading of the disk cassette 30 is completed, the magnetic head holder 3 rotates until it comes into contact with the stopper 7, and the magnetic head 2 and the load beam 4 approach the disk surface of the magneto-optical disk 40. It will be in the state (see FIG. 16).

(Fifth Embodiment) The configuration of such a magneto-optical disk device and the embodiment of the characteristic portion of the shape of the disk cassette of the magneto-optical disk corresponding thereto can be implemented in various modified forms. A modified example of the disc cassette is as follows, for example.

FIG. 20 shows an example in which an arrow-shaped groove hole 35 is provided on the shell surface on the side where the levitation slider equipped with a magnetic head for applying a bias magnetic field by the magnetic field modulation method is inserted into the head window. Has been done. With or without this groove, for example, if there is no groove, the magnetic head is retracted by mechanical interlocking operation.
By inserting the engaging element of the sensor as described above into this groove, the type of the magneto-optical disk is determined,
The disk surface is accessed.

FIG. 21 shows that the shape of the shutter slide 32 is used as the detected portion for discriminating the type of the magneto-optical disk. Here, the shutter slide is set so as to protrude in the insertion direction of the disc cassette so as to be t + Δt with respect to the normal height t. Then, this difference in height is determined by a mechanical contact type sensor.

FIG. 22 shows an example in which the shape of the shutter 31 is used as a detected portion for discriminating the type of magneto-optical disk. Here, the shutter slide is configured to project in the insertion direction of the disc cassette so as to be higher than the normal height by Δt.
Then, this difference in height is determined by a mechanical contact type sensor.

FIG. 23 (a) shows whether the chamfered portion 34 'which has been conventionally provided is installed as it is or is abolished in order to determine the case where the disc cassette is turned upside down when loaded. At the corner 34 (as it is), the type of magneto-optical disk is discriminated. Alternatively, as shown in FIG. 23 (b), a recess 34 "may be formed in a shape opposite to that of chamfering.

In the case of the disc cassette, which has no chamfer,
It is also possible to adopt a type in which an engaging element of a mechanical contact type sensor is inserted into the recess 36 on the side of the chamfer when loading. It should be noted that, in effect, since the pin for opening and closing the shutter falls into the recess beside the chamfer, there is no obstacle to eliminating the chamfer.

As described above, the characteristic portion of the disc cassette is given by the difference in the concave and convex shapes, and this is detected as the detected portion by the mechanical contact type sensor, so that the type of the loaded magneto-optical disc can be discriminated. Can be done.
It should be noted that the characteristic part of the shape shown in FIGS. 22 and 23 is that even after the shutter is released,
Since it can be detected, there is no restriction on the configuration of the shutter opening / closing mechanism in the loading section of the magneto-optical disk device.

Next, the structure of a magneto-optical disk device adapted to the characteristic portion of the disk cassette shown in FIG. 22 will be described with reference to FIGS. Here, unlike the configuration shown in the third embodiment, the mechanical contact type sensor 5 for discriminating the type of the magneto-optical disk is provided with an engaging element 5A at one end and the other end 5C below the swing member 1. The disk cassette holder 20 is faced to the side so that it can be inserted into and removed from the side, and is pivotally supported on the disc cassette holder 20 by a pivot shaft 5B at an intermediate portion. The engagement element 5A is biased in the front-rear direction. The position where the engagement element 5A faces the front edge of the disc cassette 30 is the position where the shutter 31 is opened and the position is slid. In addition, in the above-described embodiment, the swinging member 1 is eccentrically rotated in the direction of separating the locking portion from the engaging member 3A by the action of the torsion spring 17A.

The characteristic part of the magnetic modulation type disk cassette 30 used in this magneto-optical disk device is shown in FIG.
As shown in, the front edge of the shutter 31 has a specially projected shape. On the other hand, the optical modulation type disc cassette 30 'used in the same magneto-optical disc device is shown in FIG.
As shown in FIG. 5 (b), the front edge of the shutter 31 'has a normal shape.

With such a structure, when the magnetic field modulation type disc cassette 30 is loaded in the disc cassette holder 20, when the shutter 31 is completely opened,
Since the engagement element 5A is pushed by the front edge of the shutter and the other end 5C is pulled out from the lower side of the swing member 1 against the tension spring 17 (see FIGS. 25 and 26), the sensor 5 and Since the engagement with the oscillating member 1 is released, the disc cassette holder 20 is lowered, and at the stage when the disc is set on the spindle motor 80, the engaging member 3A is not pushed up by the engaging portion. Therefore, the magnetic head 2 and the load beam 4 are connected to the disk cassette 3 described above.
Inserted in the 0 head window (head insertion window),
The magnetic head 2 faces the disk surface with a predetermined gap maintained.

Further, the disc cassette holder 20
When the disk is released from the spindle motor 80, the engaging member 3A hits the rocking member 1 and is pushed up by the lifting of the disk cassette holder 20 to rotate the magnetic head holding member 3. The magnetic head 2 is retracted above the head window of the disk cassette 30.

On the other hand, the light modulation type disk cassette 30 '
Is loaded in the disc cassette holder 20, the front edge of the shutter 31 does not hit the engaging element 5A, for example, leaving a gap Gp even when the opening of the shutter 31 is completed. The engagement between the rocking member 1 and the rocking member 1 is maintained (see FIGS. 27 and 28). Therefore, even when the disc cassette holder 20 is lowered and the disc is set on the spindle motor 80, the engaging member 3A is pushed up by the engaging portion, and the magnetic head 2 and the load beam 4 are moved to the disc cassette. It is retracted outside the head window of 30 '. Therefore, a magnetic head (not shown) of the optical modulation type which applies a constant bias magnetic field through the head window can access the disk surface.

(Sixth Embodiment) Next, the structure of a magneto-optical disk device adapted to the characteristic portion of the disk cassette shown in FIG. 22A will be described with reference to FIGS. Here, unlike the configuration shown in the fourth embodiment, the mechanical contact type sensor 5 for discriminating the type of the magneto-optical disk is used.
Is provided at the end of the extension portion 1C of the swing member 1 so as to project downward, and this is the cassette holder 20.
Through the opening 20A formed in the disk cassette 3
It faces 0 or 30 '. In addition, the engaging element 5
The biasing force that presses A toward the disc cassette side is provided by also using the torsion spring 17A that biases the swinging member 1.

With such a structure, when the above cassette holder 20 is loaded with a disc cassette 30 'of a normal optical modulation type magneto-optical disc, as shown in FIGS. The chamfered portion 34 'thus formed causes the engagement element 5A to fall, and the swinging member 1 presses the engagement member 3A upward (as indicated by an arrow in FIG. 32) at its locking portion. Therefore, even after the loading of the disc cassette 30 'is completed, the magnetic head 2 of the magnetic field modulation system and the load beam 4 supporting the magnetic head 2 are held in the retracted state (see FIG. 31).

Further, when the disc holder 30 of the magnetic field modulation type magneto-optical disc is loaded in the cassette holder 20, as shown in FIGS. 29 and 30, a corner portion 34 (not chamfered) of the disc cassette 30 is provided. ), The engaging element 5A is pushed up, so that the rocking member 1
However, the engaging portion is separated from the engaging member 3A (see FIG. 3).
0). Therefore, when the loading of the disk cassette 30 is completed, the magnetic head holder 3 rotates until it comes into contact with the stopper 7, and the magnetic head 2 and the load beam 4 approach the disk surface of the magneto-optical disk 40. It will be in the state (see FIG. 29).

(Seventh Embodiment) Next, referring to FIG. 33,
A mechanical contact type sensor adapted to the characteristic portion of the shape of the disc cassette shown in FIG. 20 will be described. here,
A micro switch 120 is mounted on the cassette holder 20 as the sensor. The micro switch 120 is provided with an engaging element 125 made of a leaf spring and corresponding to the arrow-shaped slot 35 of the disc cassette 30. Is provided as a contactor of the. Also, in this magneto-optical disk device, the microswitch 120 is used in the control system.
3A (106) engaging member provided on the magnetic head holder 3 (111) by detecting the on / off operation of the
And a pressing drive member (107) for pressing.

Since the other structure is the same as the conventional structure, its description is omitted. When adopting such an electrical configuration, as shown in FIGS. 34A to 34C, the control system of the magneto-optical disk device as described in the conventional example can be adopted as it is. Note that FIG. 34A shows a case where a light modulation type disc is loaded, and FIG.
Indicates the case where a magnetic modulation type disk is loaded. It should be noted that FIG. 34C shows a state where the disc cassette is unloaded for any type of disc.

(Eighth Embodiment) Further, referring to FIG. 35, the structure of a sensor of a magneto-optical disk device adapted to a disk cassette having the characteristic portion shown in FIG. 23 will be described. Here, the micro switch as described above is adopted as the sensor, and the bell crank type member 124 is adopted as the mechanical contact type engaging element thereof. The member 124 pivotally supports the pin 123 on the cassette holder 20, has an engaging portion 125 corresponding to the detected portion 34 at one end, and has the other end corresponding to the push button of the micro switch. There is.

(Supplementary Note) Incidentally, FIG. 33 and FIG.
As a sensor in place of the microswitch shown in
A light shielding type photo sensor may be adopted. Further, FIG. 36 shows a configuration of the characteristic portion of the shape of the disc cassette described above, which is devised in view of its manufacturing advantages. Here, the type of the magneto-optical disk is discriminated whether it is a light modulation type or a magnetic modulation type depending on whether or not the hole 35 is formed in the cassette shell as the detected portion. The mechanism used for this determination uses a plug 37 as an engaging element of a mechanical contact type sensor and inserts this into the hole 35 to perform the above detection.

[0056]

As described above, according to the present invention, the disc cassette of the magneto-optical disc to be used is provided with the detected portion having a desired uneven shape, and the loading portion of the device corresponding thereto is mechanically contact type. Since it is equipped with a sensor, it is possible to directly detect the characteristic shape of the disk cassette, and to provide an excellent control such as giving the retracting operation of the magnetic head mechanically or using a conventional electric control system. You can exercise your sex. Further, the magneto-optical disk device of the present invention is an optical modulation type magneto-optical disk and a magnetic field modulation type magneto-optical disk,
It can also be used with ROM discs, without incurring the space penalty of the device. Therefore, the magnetic field modulation overwrite can be performed without impairing the convenience of using the existing disc, and high speed writing can be realized at a small size and at a low price.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a side view showing the above embodiment.

FIG. 3 is a side view showing a mode of use of the above embodiment.

FIG. 4 is an end view from the direction of arrow A in FIG.

FIG. 5 is a side view showing a mode of use of the above embodiment.

6 is an end view from the direction of arrow B in FIG.

FIG. 7 is an end view of a use mode shown in (a) and (b) of a second embodiment of the present invention.

FIG. 8 is a perspective view of a disc cassette according to the present invention.

FIG. 9 is a perspective view showing a third embodiment of the present invention.

FIG. 10 is a side view showing the embodiment.

FIG. 11 is a side view showing a mode of use of the above embodiment.

12 is an end view from the direction of arrow A in FIG.

FIG. 13 is a side view showing a mode of use of the above embodiment.

FIG. 14 is an end view from the direction of arrow B in FIG.

FIG. 15 is a perspective view of a disc cassette according to the present invention.

FIG. 16 is a side view showing a mode of use of the fourth embodiment of the present invention.

17 is an end view of FIG.

FIG. 18 is a side view showing a mode of use of the above embodiment.

FIG. 19 is an end view of FIG.

FIG. 20 is a perspective view showing another embodiment of the disc cassette according to the present invention.

FIG. 21 is a perspective view showing another embodiment of the disc cassette according to the present invention.

FIG. 22 is a perspective view showing another embodiment of the disc cassette according to the present invention.

23 (a) and 23 (b) are perspective views showing another embodiment of the disc cassette according to the present invention.

FIG. 24 is a perspective view showing a fifth embodiment of the present invention.

FIG. 25 is a side view showing a mode of use of the above embodiment.

FIG. 26 is an end view from the direction of the arrow A in FIG.

FIG. 27 is a side view showing a mode of use of the above embodiment.

28 is an end view from the arrow B direction in FIG. 27. FIG.

FIG. 29 is a side view showing a mode of use of the sixth embodiment of the present invention.

30 is an end view from the direction of the arrow A in FIG.

FIG. 31 is a side view showing a mode of use of the above embodiment.

32 is an end view from the direction of the arrow B in FIG. 31. FIG.

FIG. 33 is a perspective view showing a seventh embodiment of the present invention.

FIG. 34 is a side view showing (a) to (c) the use modes of the above embodiment.

FIG. 35 is a perspective view showing a mode of use of the eighth embodiment of the present invention.

FIG. 36 is a perspective view showing another embodiment of the disc cassette according to the present invention.

FIG. 37 is a side view showing a usage example of a conventional example.

FIG. 38 is a side view showing a usage state of a conventional example.

FIG. 39 is a side view showing a usage pattern of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rocking member 2 magnetic head 3 magnetic head holding member 3A engaging member 4 load beam 6 optical head 7 stopper 10 carriage 11 engaging abutting member (sensor) 11B engaging member 20 disk cassette holder 30 disk cassette 40 magneto-optical disk

Claims (17)

[Claims] 1. An optical head capable of moving in a seek direction and a tracking direction so as to irradiate a laser beam onto a disk surface of a magneto-optical disk to write and read information magneto-optically is provided corresponding to the disk surface. In the magneto-optical disk device, a magnetic head of a magnetic field modulation type that faces the optical head is mounted on a flying slider with the magneto-optical disk sandwiched between the magnetic head and the optical head. In order that the loading / unloading of the magnetic head with respect to the disc cassette may be synchronized with the mounting means of the disc cassette in the loading section,
It is configured to be detected by a mechanical contact type sensor, and the mechanical contact operation of this sensor is performed by a characteristic portion of the shape provided in the disk cassette, and the mechanical operation of the sensor causes the magnetic head to operate. A magneto-optical disk device, characterized in that it is configured to control mechanical means for raising and lowering a holding member for holding with respect to a retracted position of a magnetic head. 2. The featured portion of the shape provided on the disc cassette is a groove or a hole provided on a side surface (a wall surface vertical to the disc surface) of the disc cassette. Magneto-optical disk device. 3. The characteristic portion of the shape provided on the disk cassette is a groove or a hole provided on the upper surface or the lower surface (the surface parallel to the disk surface) of the disk cassette. The magneto-optical disk device described in 1. 4. The magneto-optical disk apparatus according to claim 1, wherein the characteristic portion of the shape provided on the disk cassette is a groove or a hole provided in the shutter of the disk cassette. 5. The magneto-optical disk device according to claim 1, wherein the characteristic portion of the shape provided on the disk cassette is an uneven portion provided on the front edge of the disk cassette. 6. A levitation slider equipped with the magnetic head is configured to load / load the magnetic head to / from a disk surface and a disk cassette surface via the holding member.
The magneto-optical disk device according to claim 1, wherein the magneto-optical disk device is rotatably supported in the unloading direction. 7. The mechanical contact type sensor is composed of an engaging and abutting member provided in a loading portion of the disk cassette, and is engageable with and disengageable with a characteristic portion of the shape of the disk cassette. The magneto-optical disk device according to claim 1, wherein the magneto-optical disk device has a structure. 8. When loading / unloading the magnetic head to / from the disk surface, the cassette holder portion is directly or indirectly engaged with or abuts a part of the retractable holding mechanism of the magnetic head, or the engagement thereof is performed. The magneto-optical disk device according to claim 1, wherein the magneto-optical disk device is configured to be released. 9. A mechanism for loading / unloading the magnetic head to / from a disk surface comprises an engaging member provided on a holding member for holding a floating slider, and a mechanism for always loading the engaging member in a direction for loading the magnetic head. A biasing spring member and a locking portion that is engaged with the engaging member are provided, and engagement of the engaging member with the locking portion defines a load position of the magnetic head. The magneto-optical disk device according to claim 1. 10. An optical head capable of moving in the seek direction and the tracking direction so that the disk surface of the magneto-optical disk is irradiated with laser light to write and read information magneto-optically corresponds to the disk surface. Used in a magneto-optical disk device in which a magnetic field modulation type magnetic head facing the above-mentioned optical head is mounted on a flying slider with the magneto-optical disk sandwiched therebetween, and is linked with the above optical head. In a disc cassette to be loaded, when loaded in the loading section of the magneto-optical disc device,
In order to determine the loading / unloading operation of the magnetic head with respect to the magneto-optical disk when the magnetic head is inserted in the head window provided in the cassette shell, the concavo-convex for engaging a member on the magneto-optical disk device side A magneto-optical disk cassette characterized in that the shape is installed on the upper and lower surfaces or side surfaces of the cassette shell, and further on the front edge thereof so as to be added or removed. 11. The concave-convex shape is a groove newly provided on a side surface of the cassette shell, a non-penetrating groove that can be penetrated, or an abolished portion of the groove.
The magneto-optical disk cassette described in. 12. The uneven shape is a groove or hole newly provided in a non-label sticking portion on the upper and lower surfaces of the cassette shell or a non-shutter sliding portion. The described magneto-optical disk cassette. 13. The magneto-optical disk cassette according to claim 10, wherein the uneven shape is a groove or a hole provided in the shutter portion. 14. The uneven shape has only a shutter portion,
11. The magneto-optical disk according to claim 10, wherein both the shutter and the shutter slider have a structure in which a prescribed amount is projected in the direction in which the disk cassette is inserted into the loading portion of the magneto-optical disk device. cassette. 15. The magneto-optical disk cassette according to claim 10, wherein the concavo-convex shape is a structure in which chamfering of a corner of the disk cassette is eliminated, and / or a novel protrusion portion at a corner portion. 16. The magneto-optical disk cassette according to claim 10, wherein the concavo-convex shape is formed by a groove extended from a groove of a cassette shell through which the shutter slider passes. 17. The optical disk cassette according to claim 10, wherein the concavo-convex shape has a structure in which a plurality of plugs are detachably or movably attached to holes provided at predetermined positions of a cassette shell.