JPH0536199A - Optical disk player - Google Patents

Abstract

PURPOSE:To reproduce recorded information in the state of retreating a magnetic head by retreating the magnetic head from a magneto-optical disk when the write of magnetic information with the magnetic head of a flying head system is disabled. CONSTITUTION:When the recorded information is read out of the magneto- optical disk recording the information, the information relating to the kind of the disk D is read by an optical sensor. In a discriminated result, when the disk D is suitable to a flying system, by a discriminating part, the recorded information is read with an optical pickup 14 without moving a magnetic head supporting member 12 supporting the magnetic head 13 with a moving arm 15. On the other hand, when the disk D is not suitable to the flying system by the discriminated result, the magnetic head supporting member is displaced elastically upward by the moving arm 15. The magnetic head 13 is retreated from the surface of the disk D. In this state, when the recorded information is read, a moving body 11 is moved in the direction of an allow A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disc player for recording / reproducing information on / from a magneto-optical disc, and more particularly to a magneto-optical disc player in which a magnetic head is levitated from a magneto-optical disc by an air flow caused by rotation of the magneto-optical disc. .

[0002]

2. Description of the Related Art FIG. 5 shows a general schematic structure of a conventional magnetic head device used in a magneto-optical disk player.
The illustrated magnetic head device 1 is composed of a moving table 5 that moves in the tracking direction A of the magneto-optical disk D, and a magnetic plate spring having one end fixed to the moving table 5 and a magnetic head 2A attached to the open end. The head support member 2 and the magneto-optical disk D are sandwiched between the optical pickup 7 and the optical pickup 7 which is mounted on the moving table 5 so as to face the magnetic head 2A. An elevating arm 3 for elevating and lowering by supporting an intermediate portion of the magnetic head supporting member 2 and a fulcrum P of the elevating arm 3.
And an electromagnetic solenoid 4 for attracting the magnetic head 2A in the direction of the disk D via a spring.

The supporting structure of the magnetic head 2A is so-called a flying head system in which the magnetic head 2A itself floats above the surface of the magneto-optical disk D by the air flow generated by the rotation of the magneto-optical disk D. Is. This method has the advantages that the switching speed in the magnetization direction is higher than that of the fixed magnetic head method and that the mass can be reduced, so that the access speed can be improved.

[0004]

By the way, in order to perform the above flying head system favorably, the magnetic head 2 is used.
The surface of the magneto-optical disk D facing A must be processed smoothly. The conventional magneto-optical disk D is
As shown in FIG. 6, a protective layer D2 such as an ultraviolet curable resin is formed on the surface of the recording layer D1. By smoothly processing the surface of the protective layer D2, the above flying head method can be performed well. I was trying to make it. Also,
The formation of the protective layer D2 also has an advantage that the recording layer D1 on which information is recorded is not damaged even if the magnetic head 2A comes into contact with it.

However, with the spread of magneto-optical disks in recent years, there is a movement to unify the standards, but this standard does not specify the protection layer. Therefore, in this case, although the protective layer is formed, it may be assumed that the surface is not smooth enough to perform the flying head method favorably or the protective layer itself is not formed. When attempting to read the recorded information by the optical pickup in such a state, the magnetic head comes into contact with the non-smooth protective layer or the recording layer itself. Such a contact has a problem that the magnetic head itself may be damaged or the recording layer may be damaged.

On the other hand, a fixed magnetic head system may be considered in which the magnetic head is moved while maintaining a constant distance with respect to the magneto-optical disk. In this case, the power consumption increases and the size of the apparatus increases. However, there is a drawback in that the control circuit is complicated and the access speed is not reduced due to the increase in mass.

Therefore, an object of the present invention is to provide a magneto-optical disk player capable of reproducing recorded information in a state where the flying head type magnetic head is retracted from the optical disk regardless of the structure of the magneto-optical disk.

[0008]

In order to achieve the above object, the structure of the present invention is such that a magnetic head for writing magnetic information on a magneto-optical disk is elastically floated by an air flow caused by rotation of the magneto-optical disk. A magnetic head support member for supporting the optical head and an optical pickup for reading magnetic information written on the magneto-optical disk are provided, and the magnetic head support member and the optical pickup serve as a moving body that is moved in the tracking direction of the magneto-optical disk. In the attached magneto-optical disc player, a magnetic head moving arm that is attached to a fixed portion in the disc player and elastically displaces the magnetic head supporting member so that the magnetic head retracts from the magneto-optical disc; A discriminating means for discriminating whether or not the magnetic information is writable by the head, and a magnetic disc. When the writing of the information is determined to be impossible, it is assumed that the magnetic head is provided and an arm driving means for driving the magnetic head moving arm so as to retract from the magneto-optical disk. In this case, at the contact portion of the magnetic head moving arm with the magnetic head supporting member,
It is preferable to provide a low-friction member for smoothly performing the relative sliding.

[0009]

According to the present invention having the above-mentioned structure, when the discriminating means discriminates that the magnetic information cannot be written by the flying head type magnetic head, the arm driving means operates the magnetic head moving arm. By driving, the magnetic head is retracted from the magneto-optical disk. Therefore, even when the recording information is read by the optical pickup, the magnetic head retains the state retracted from the magneto-optical disk. It is possible to reproduce.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view showing an embodiment of a magnetic head device provided in a magneto-optical disc player. The illustrated magnetic head device 10 includes a movable body 11 movably arranged in the tracking direction A of the magneto-optical disk D, and one end 12a.
Is fixed to the upper end of the movable body 11 in the figure, and the open end 1
2b includes a magnetic head supporting member 12 formed of a leaf spring having a magnetic head 13 attached thereto, an optical pickup 14 attached to the moving body 11 so as to face the magnetic head 13 with the magneto-optical disk D interposed therebetween, and a fixed portion in the player. A magnetic head moving arm 15 that is attached and moves the magnetic head supporting member 12 in a direction B in which the magnetic head 13 floats above the surface of the magneto-optical disk D is provided. Incidentally, reference numeral 24 in the drawing denotes an optical sensor for reading information on the type of the magneto-optical disk, which is recorded in the loaded magneto-optical disk D.

The moving body 11 has tracking electromagnetic coils 16 and 16 attached to both ends thereof, and focusing electromagnetic coils 17 and 17 provided to both ends of the optical pickup 14 as well. The moving body 11 having such a structure is slidable in the direction of arrow A by running wheels (not shown) provided on the lower surface of the drawing.

The tracking electromagnetic coil 16 constitutes a part of a linear motor 23 for moving the moving body 11 in the direction of arrow A. The linear motor 23 and the rectangular parallelepiped permanent magnet 18 are seen from the upper surface in the figure. A yoke 19 having a U-shape, a square pole-shaped yoke 20 arranged so as to connect both open ends of the yoke 19, and the tracking electromagnetic coil 16 loosely fitted in the yoke 20. Is equipped with. Of these, the yoke 19 is attached to a fixed portion in the player. Such linear motors 23 are arranged at both ends of the moving body 11, respectively.

The magnetic head support member 12 supports the magnetic head 13 attached to the open end thereof so as to float above the surface of the magneto-optical disk D by the action of the air flow generated by the rotation of the magneto-optical disk D. It is an elastic body made of a leaf spring. The magnetic head moving arm 15 is driven by a solenoid 27 and an arm drive unit 26 described later so as to rotate in a direction indicated by an arrow C about a shaft 15a rotatably attached to a fixed portion (not shown). It is like this. Further, a rotary roller 15b as a low friction member for smoothly sliding the magnetic head moving arm 15 and the magnetic head supporting member 12 relative to each other is provided at an end portion of contact with the magnetic head supporting member 12. Has been.

Next, referring to FIG. 2, in particular, the magnetic head 13
The electric system for moving the will be described. FIG. 2 is a block diagram showing a configuration of an electric system for moving the magnetic head 13. The electric system for moving the illustrated magnetic head 13 determines whether or not the magnetic information can be written by the flying head type magnetic head 13 based on the information on the type of the magneto-optical disk read by the optical sensor 24. Then, the magneto-optical disk D becomes the magnetic head 13.
When it is determined that the magnetic information cannot be written by the determination unit 2, the determination unit 2 that sends a write disable signal to the subsequent stage.
5 and an arm drive unit 26 for driving the solenoid 27 connected to the subsequent stage by the write disable signal and moving the magnetic head moving arm 15 by the solenoid 27.

Of these, the optical sensor 24 and the discriminating unit 25 constitute discriminating means 28 for discriminating whether or not the magnetic information is writable by the magnetic head, and the arm driving unit 26 and the solenoid 27 serve to discriminate the magnetic field. When it is determined that information cannot be written, the magnetic head 1
The arm drive means 29 is configured to drive the magnetic head moving arm 15 so that the magnetic head 3 moves away from the magneto-optical disk D.

The optical pickup 14 is provided with an objective lens 14a for transmitting and receiving laser light to and from the magneto-optical disk D arranged on the upper surface in the central portion of the upper surface in the drawing, and writing of magnetic information by the magnetic head 13 described above. At times, laser light is irradiated to heat the laser light, and when reading recorded information, the laser light is irradiated and the reflected light is received.

The operation of the embodiment apparatus having the above configuration will be described with reference to FIGS. 3 (A) and 3 (B). <Reading of Information> When reading the recorded information from the magneto-optical disk D on which information has already been recorded, the type of the loaded magneto-optical disk D is determined prior to the read operation. That is, the optical sensor 24 reads the information about the type of the magneto-optical disk D recorded on the magneto-optical disk D.

The discriminating section 25 discriminates whether or not the recording information can be written by the flying head type magnetic head 13 based on the read information. As a result of this determination, if the loaded magneto-optical disk D is suitable for the flying head system described above, the magnetic head support member 12 that supports the magnetic head 13 shown in FIG.
The recorded information is read out by the optical pickup 14 arranged below the magneto-optical disk D without moving the disk by the moving arm 15.

On the other hand, if the loaded magneto-optical disk D is not suitable for the flying head system, the magnetic arm support member 12 is shown by the moving arm 15 as shown in FIG. Elastically displace upward. As a result, the magnetic head 13 retracts from the surface of the magneto-optical disk D. In this embodiment, the moving arm 15 causes the magnetic head support member 12 to be parallel to the sliding direction A of the moving body 11.

When the recorded information is read in this state,
While maintaining the illustrated state, the moving body 11 is slid in the direction of arrow A, which is the tracking direction. In this case, the moving arm 15 and the magnetic head supporting member 12 are in contact with each other via the rotating roller 15b which is a low friction member. Therefore, the moving body 11 is in the direction of arrow A (for example, indicated by (a) in the figure).
When it slides, the rotary roller 15b rotates with this slide. By rotating the rotating roller 15b in this way, smooth sliding can be performed without obstructing the sliding of the moving body 11.

The magnetic head support member 12 is the moving body 1.
Since the displacement is parallel to the arrow A direction, which is the sliding direction of 1, the sliding of the moving body 11 does not cause the displacement in the arrow B direction. No force is generated. This means that mobile 1
Since the load applied to the linear motor 23 sliding 1 is not changed, it is possible to always secure a stable sliding state of the moving body 11.

In this embodiment, the magnetic head support member 12 is moved by the moving arm 15 so as to be parallel to the arrow A direction. However, the magnetic head support member 12 is moved in the arrow A direction. Even in the inclined state, if the component force generated at this time does not pose a problem, it is not always necessary to move to the above state.

<Information Writing> First, the type of the loaded magneto-optical disk D is determined. If the loaded magneto-optical disk D can properly perform the flying head system by this determination, the magnetic head 13 is levitated on the surface of the magneto-optical disk D as shown in FIG. Information is written while irradiating laser light from the optical pickup 14 arranged below. On the other hand, the determination unit 2
When it is determined that the magneto-optical disk D loaded by No. 5 is not suitable for the flying head system,
The writing operation is stopped and, for example, a display such as "not shown" provided on the player displays "writing has been stopped".

The magnetic head support member 1 is used when the magneto-optical disk is replaced or when it is not accessed for a long time.
2 is moved to the position indicated by (B) in the figure. The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the invention.

In the above-mentioned embodiment, the rotary roller is exemplified as the low friction member, but the present invention is not limited to this, and the relative displacement of the magnetic head support member even when the magnetic head support member is moved by the moving arm. Anything that can smoothly carry out

Further, since the recording information is read from the magneto-optical disk through the optical pickup, the magnetic head is not used in this reading mode.
Therefore, even in the magneto-optical disk capable of the flying head method, as shown in FIG. 3B, the magnetic head may be held in a state of being retracted from the magneto-optical disk. In this case, for example, it is possible to prevent the magnetic head from flying and being damaged by scratches or dust on the disk surface.

By the way, the moving arm may have the structure shown in FIG. The moving arm 21 shown in FIG.
The rotating roller 15b is attached to the open end, and the other end is attached to the electromagnetic solenoid 22 so that it can move in the direction of arrow B. Even when such a moving arm 21 is used, it is possible to obtain the same operation and effect as those of the above-described embodiment.

[0028]

According to the present invention described in detail above, there is provided a magneto-optical disk player capable of reproducing recorded information while the magnetic head of the flying head system is retracted from the optical disk regardless of the structure of the magneto-optical disk. You can In particular, if a low-friction member is provided on the magnetic head support member of the magnetic head moving arm, it is possible to favorably slide the both.

[Brief description of drawings]

FIG. 1 is an external perspective view of a magnetic head device used in a magneto-optical disk player as one embodiment.

FIG. 2 is a block diagram showing a configuration of an electric system that moves a magnetic head.

FIGS. 3A and 3B are explanatory views showing operating states of the magnetic head device, respectively.

FIG. 4 is an explanatory view showing another embodiment of the magnetic head moving arm.

FIG. 5 is an explanatory diagram showing a general schematic configuration of a conventional magnetic head device.

FIG. 6 is a sectional view showing the structure of a conventional magneto-optical disk.

[Explanation of symbols]

12 Magnetic head support member 13 Magnetic head 14 Optical pickup 15 Moving arm 15b Low friction member 28 Discrimination means 29 Arm drive means D magneto-optical disk

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masao Ohkita             1-7 Aki, Otsuka-cho, Yukiya, Ota-ku, Tokyo             Su Electric Co., Ltd.

Claims (2)

[Claims] 1. A magnetic head supporting member for elastically supporting a magnetic head for writing magnetic information on a magneto-optical disk so as to be levitated by an air flow caused by rotation of the magneto-optical disk, and a magnetic field written on the magneto-optical disk. In a magneto-optical disc player, which comprises an optical pickup for reading information, the magnetic head supporting member and the optical pickup are attached to a moving body which is moved in the tracking direction of the magneto-optical disc, a fixed part in the disc player. And a magnetic head moving arm that elastically displaces the magnetic head supporting member so that the magnetic head retracts from the magneto-optical disk, and whether the magnetic head is a magneto-optical disk in which magnetic information can be written. When it is determined that the discriminating means cannot write magnetic information, the magnetic disc A magneto-optical disk player, comprising arm driving means for driving an arm for moving a magnetic head so that the head retracts from the magneto-optical disk. 2. A magneto-optical disk player according to claim 1, wherein a low-friction member is provided at a contact portion of the magnetic head moving arm with the magnetic head supporting member so as to smoothly perform relative sliding.