JPH02312033A - Magneto-optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To miniaturize the core of a magnetic head and to realize high-frequency modulation by making the magnetic head float, controlling the actuator of a tracking direction and interlocking the magnetic head corresponding to the lens position of an optical head. CONSTITUTION:The magnetic head 2 is mounted on a floating head slider and held at a fixed interval where it is closely brought into contact with a recording medium 4. Then, the magnetic head 2 is interlocked by the actuator 3 of the tracking direction corresponding to the lens position of the optical head 1. Thus, the optical head 1 and the magnetic head 2 are controlled so as to make the optical axis of the head 1 always coincide with the central axis of the core of the head 2. Therefore, the core of the head 2 is miniaturized and the winding number thereof is reduced. Besides, the high-frequency modulation is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical recording/reproducing device capable of override recording.

[Conventional technology]

As a magneto-optical recording/reproducing head that enables override, the tortoise shown in FIGS. 4 and 5 has been known, and will be briefly explained below.

First, FIG. 4 will be explained. 43 is a magneto-optical disk, which is rotated by a spindle shaft 44.

Reference numeral 42 denotes an optical head, which is mounted on a carriage 47 on the side of the transparent substrate 46 and is configured to move between recording tracks (hereinafter referred to as tracks) on the magneto-optical disk 45. Reference numeral 41 denotes a magnetic head, which is disposed close to the magneto-optical disk 45 so as not to come into contact with it during rotation, facing the optical head 42 in a non-contiguous relationship, and is fixed to a structural member of the device. In this configuration, information is written on the magneto-optical disk 43 by moving the optical head 42 to a predetermined track position, irradiating the recording layer 45 corresponding to the track with a laser beam from the optical head, and simultaneously writing the information to be recorded from the magnetic head 41. When a corresponding magnetic field is applied, the magnetization of only that portion is reversed, and magnetic recording is performed. Note that rewriting by overriding to this position is also performed by pressing in the same manner as above.

Next, K for reproducing this recorded signal utilizes the Kerr effect caused by the interaction between light and magnetism. The laser power of the optical head 42 is reduced to about 173 or less at the time of recording, and the laser power is irradiated onto the recording section, and the head detects the reflected light from the laser and converts it into an electrical signal, thereby reproducing the recording.

Next, FIG. 5 will be explained. The magnetic head 5 is mounted on an actuator 52 that can be driven in two dimensions similar to the optical head 54.
The optical head 54 and the magnetic head 51 are arranged opposite to each other in an interlocking relationship and can freely move between tracks. The two-dimensional drive of the two-dimensional actuator 52 is characterized in that it is performed using a focusing error signal and a tracking error signal from the optical head 54 side. Writing and reproducing information is performed on the same principle as in FIG. 4 above.

[Problem to be solved by the invention]

However, in the magneto-optical recording and reproducing method shown in Figure 4 above, the magnetic head avoids waviness (surface wobbling) of the disk and is fixed in a non-contact manner, which creates a wide gap between the recording layer and the magnetic head, which causes magnetization reversal. To obtain the necessary magnetic field on the recording layer,
It has a large head configuration with a large number of coil turns and a large passing current. However, in order to enable magnetization reversal at a high frequency (recording and reproducing information at high speed by overriding with magnetic field modulation, etc.), the number of turns of the electromagnet coil of the magnetic field generating means must be reduced to reduce the inductance. Must be contrary to the above conditions. Therefore, the method shown in FIG. 4 has the problem that it is extremely difficult to record and reproduce information at high speed.

In addition, in the magneto-optical recording and reproducing method shown in FIG. 5, the magnetic head is driven by a two-dimensional actuator similar to the optical head, and is installed facing each other, so the entire structure including the connecting means is large. This has problems in that it is disadvantageous when seeking, and it is also difficult to make the device thinner.

〔the purpose〕

The present invention has been made in view of the problems of the prior art described above, and its purpose is to provide a magneto-optical recording and reproducing device that makes it possible to downsize the magnetic head and reduce the number of coil turns. .

[Means to solve the problem]

According to the present invention, the above object is achieved by arranging a magnetic head and an optical head coaxially and facing each other on both sides of a disk-shaped recording medium formed by forming a magneto-optical recording layer on a substrate. In a magneto-optical recording/reproducing device for recording and/or reproducing information on a layer, the magnetic head is mounted on a flying head slider, and the slider is connected to one end of a load beam. One end of a parallel plate spring is connected to the other end, and the load beam is capable of fine movement control in a direction perpendicular to the tracks of the disk-shaped recording medium. This is achieved by a magneto-optical recording and reproducing device, characterized in that one end is connected to a cart on which the optical head is installed.

〔Example〕

Hereinafter, embodiments of the present invention will be described specifically and in detail based on the drawings.

FIG. 1 is a side view showing a first embodiment of a magneto-optical recording and reproducing apparatus according to the present invention.

As shown in FIG. 1, the magnetic head 2 is suspended in the air, brought very close to the recording medium 4, and kept at a constant distance. Further, since the magnetic head 2 is moved by the tracking direction actuator 3 in accordance with the lens position of the optical head 1, the optical axis and the core central axis of the magnetic head are always aligned. Therefore, since the core center axis and the optical axis always match, it is possible to downsize the core of Magnetic Herad 2, and since the core is close to the recording layer, the magnetic field generated by the core can be reduced, and the number of coil turns can be reduced. Therefore, it becomes possible to realize modulation at a high frequency.

2(b) and 2(e) are a side view, a plan view, and a perspective view, respectively, showing a second embodiment of the magneto-optical recording/reproducing apparatus according to the present invention. ) e (b) is a perspective view and a bottom view showing an example of the configuration of a lens position detector, respectively.

In these figures, the transparent substrate 2B is made of a material such as I licargenate or F lath, and has a structure in which a recording layer 27 is formed on the upper surface. The optical head I disposed on the transparent substrate 28 side of the recording medium 4 includes an N optical lens 31.
Mechanism that controls focusing and tracking (
It is mounted on a so-called two-dimensional actuator (not shown).
For example, the position of the objective lens 31 is detected by a tracking operation using the configuration shown in FIGS. 3(a) and 3(b). Further, the optical head 1 is mounted on a cart 3 and is mounted on a recording medium 4.
(disk) to access a given track.

On the other hand, the magnetic head 2, which is a feature of the present invention, is mounted on a flying head slider 22, floats as the recording medium 4 rotates, maintains a certain distance (several μm) from the recording layer 27, and tracks the recording medium 4. It is configured to move slightly in a direction perpendicular to the direction. In the case of the embodiment shown in FIG. 2, the magnetic head 2
The driving means in the tracking direction includes a magnetic circuit including a yoke 26 having a U-shaped cross section and a permanent magnet 25 arranged on the back side of the yoke 26 so as to sandwich the tracking driving coil 24 attached to the parallel leaf spring 5. Then, by energizing the tracking drive coil 24, a slight movement in the tracking direction is generated.

The operation of the apparatus according to the present invention will be explained below.

For example, the direction and amount of movement of the objective lens 31 can be detected by the lens position detection means shown in FIG. 3(&). The lens position detection circuit is shown in FIG. 2(a). ), the actuator drive circuit energizes the tracking drive coil to drive the parallel plate spring 5 in accordance with the movement position of the objective lens by the tracking control circuit. The lens position detection means is performed as follows.

That is, the light receiving element 33 receives a light spot emitted from the light emitting element 32 installed on the same member as the objective lens 31 and interlocking with the objective lens 31, and as shown in FIG. Two-dimensional actuator (Figure 3 (a)
)) The projection light 33 moving on the light receiving element 33 is received by the tracking operation, and the direction and amount of movement of the objective lens are detected.

A magnetic field is mounted on the flying head slider 22 via a load beam 23 (a thin leaf spring for applying a load to the flying slider and balancing it with the air film flying blade to obtain the desired flying height) which is linked to the parallel leaf spring 5. The center of the head core 21 always coincides with the optical axis of the objective lens 31. By realizing the above effect, the core diameter of the magnetic pole is φ50.
The inductance of the magnetic head is about 10 μH because the coil winding number is about 10 to 10 turns.
High-speed recording is possible with a small size as below.

The following modifications are also possible in the present invention.

That is, the parallel plate spring 5 is replaced with a piezoelectric actuator, such as a piezoelectric actuator, and the magnetic circuit is omitted, resulting in a much simpler and lighter structure. Alternatively, it is also possible to use a tracking error signal of an optical head as tracking information of a magnetic head.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the magnetic head is floated in the air, brought very close to the recording medium, and a constant gap is always maintained, and in addition, the tracking direction actuator is used to move the magnetic head to the lens position of the optical head. The optical axis and magnetic head are always aligned in order to interlock in response to the Therefore, it is possible to downsize the core of the magnetic head, reduce the number of coil turns, and realize modulation at a high frequency.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a first embodiment of a magneto-optical recording and reproducing apparatus according to the present invention. Figure 2 (a) # (b). (c) is a side view, a plan view, and a perspective view, respectively, showing a second embodiment of the magneto-optical recording and reproducing apparatus according to the present invention. FIGS. 3(a) and 3(b) are a perspective view and a bottom view, respectively, showing an example of the configuration of a lens position detector. FIGS. 4 and 5 are side views showing conventional examples of magneto-optical recording and reproducing apparatuses. DESCRIPTION OF SYMBOLS 1... Optical head, 2... Magnetic head, 3... Tracking direction actuator of magnetic head, 4...
Recording medium, 5... Lens position detector.

Claims (3)

[Claims] (1) A magnetic head and an optical head are disposed coaxially and facing each other on both sides of a disk-shaped recording medium having a magneto-optical recording layer formed on a substrate, and information is transmitted to the magneto-optical recording layer. In a magneto-optical recording and reproducing device for recording and/or reproducing, the magnetic head is mounted on a flying head slider, the slider is connected to one end of a load beam, and a parallel plate is connected to the other end of the load beam. One end of the spring is connected so that the load beam can be finely controlled in a direction perpendicular to the tracks of the disk-shaped recording medium, and the other end of the parallel plate spring is connected to the cart on which the optical head is installed. A magneto-optical recording and reproducing device, characterized in that it is connected to. (2) The magneto-optical recording and reproducing apparatus according to claim (1), wherein the flying head slider performs a seek operation in conjunction with an optical head. (3) The optical head is provided with a lens, and fine movement control of the load beam is performed based on the lens or lens holder position signal generated by the tracking operation of the lens. 1) The magneto-optical recording and reproducing device described in item 1).