JPH0516655Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is applied to a magneto-optical recording and reproducing device that records various information such as document files on a magneto-optical disk or reproduces information recorded on this disk. The present invention relates to a magneto-optical recording head device.

[Conventional technology]

Generally, in magneto-optical recording and reproducing devices, TbFeCo,
A focused laser beam is applied to a recording medium such as GdTbFe to cause a local temperature rise, and an external magnetic field is applied from an external magnetic field applying means such as a magnetic head to create a small reversed magnetization region.
Thermomagnetic recording of information is performed by making these reversed magnetization regions correspond to pits, and information is read from the recording medium using the magneto-optical effect due to the Kerr effect or Faraday effect.

Conventionally, a magneto-optical recording/reproducing apparatus includes an optical head section provided with a light source that generates a laser beam to be irradiated onto a magneto-optical recording medium, an optical detection means for detecting reflected light of the laser beam by the magneto-optical recording medium, and the like. By moving a head device integrally equipped with a magnetic head section for generating magnetism applied to the magneto-optical recording medium over the radius of the magneto-optical recording medium, The recording medium is configured to record a desired information signal on the magneto-optical recording medium or to reproduce information signals recorded on the magneto-optical recording medium. It was starting to look like this.

The optical head section constituting the head device includes an optical system that converges and irradiates the laser beam onto the magneto-optical recording medium and guides the reflected light of the laser beam from the magneto-optical recording medium to the optical detection means. By driving the objective lens constituting the optical system in the optical axis direction of the objective lens and in two axes orthogonal to the optical axis direction using a two-axis actuator, laser light is directed to the magneto-optical recording medium. I started doing tracking and focusing.

In conventional magneto-optical recording and reproducing devices, when recording information on a magneto-optical recording medium, a magnetic head section applies an erasing magnetic field to the magneto-optical recording medium in advance to align the direction of magnetization of the magneto-optical recording medium. Then, the magnetic head section applies a small bias magnetic field in the opposite direction to the erasing magnetic field to the magneto-optical recording medium, and the optical head section applies a laser beam to the magneto-optical recording medium. This was used to record information thermomagnetically by creating a small region of reversed magnetization by causing a temperature rise.

[Problem that the invention attempts to solve]

The optical head section constituting the magneto-optical recording head device used in this magneto-optical recording and reproducing apparatus includes a light source that generates a laser beam, an optical detection means that detects the laser beam, and a device that focuses the laser beam on the surface of the magneto-optical recording medium. tracking of laser light by driving the objective lens in two orthogonal axes directions;
Since it is configured with a two-axis actuator for focusing and an optical system, it is large in size and heavy.

The above-mentioned magneto-optical recording head device is provided with a magnetic head section in addition to the large-sized and heavy optical head section as described above, and this magnetic head section is also integrated with the objective lens constituting the optical head section. A two-axis actuator is used to drive the objective lens in the optical axis direction and two axes orthogonal to the optical axis direction. Therefore, the load on the two-axis actuator for driving and displacing the objective lens increases, making it difficult to realize high-speed focusing and tracking control.

The magnetic head unit, which is integrally reciprocated along the radius of the magneto-optical recording medium with the optical head unit and generates a magnetic field applied to the magneto-optical recording medium, generates a large current in the coil when generating the erasing magnetic field. As it is washed away, heat generation increases. Due to the influence of this heat generation, the operation of the semiconductor laser constituting the light source of the optical head section becomes unstable, leading to a decrease in the output of the light beam, and there is a problem in that information signals cannot be recorded with good recording characteristics.

Therefore, the present invention was proposed in view of the conventional problems as described above, and aims to reduce the size and weight of the movable part that is displaced relative to the magneto-optical recording medium in order to perform at least focus control. An object of the present invention is to provide a magneto-optical recording head device which can scan a recording track of a magnetic recording medium with good followability and which prevents the influence of heat generated when the magnetic head section is driven from being transmitted to the optical head section. It was proposed by

[Means for solving problems]

In order to achieve the above-mentioned purpose, the magneto-optical recording head device according to the present invention has a built-in optical head section including a light source, and is guided by a guide shaft to move in a direction parallel to the radial direction of the magneto-optical disk. a freely movable carrier part; a magneto-optical head part whose proximal end is supported by the carrier part and which is supported by the distal end side of an elastic member that is elastically displaceable only in a direction perpendicular to the main surface of the magneto-optical disk; The entrance end surface on one end side is opposed to the output end of the light beam of the optical head section, and the output end surface on the other end side is made to face the magnetic gap section of the magneto-optical head section, so that the optical head section and the magneto-optical head section are connected to each other. and an optical fiber disposed between them.

[Effect]

In the magneto-optical recording head device according to the present invention, the light beam emitted from the light source of the optical head section is guided to the magnetic gap section of the magneto-optical head section via an optical fiber, and The light is irradiated onto a magneto-optical disk as a magneto-optical recording medium through the output end face.

In addition, the magneto-optical head section supported at the tip side of an elastic member such as a leaf spring that can be elastically displaced only in the direction orthogonal to the main surface of the magneto-optical disk serves as a magneto-optical medium that is opposed by the magneto-optical head section. When the magneto-optical disk is driven to rotate, an air film layer generated between the main surface of the magneto-optical disk and the magneto-optical head causes elastic displacement so as to always maintain a constant distance from the main surface of the magneto-optical disk. be done.

〔Example〕

To explain the outline of the magneto-optical recording head device according to the present invention, as shown in the schematic diagram in FIG.
The output end face 5 of an optical fiber 4 that guides a light beam from an optical head section (not shown) faces the magnetic gap section 2 of the magnetic head 1, and an excitation current is passed through the coil 3 of the magnetic head 1. It is configured to record information signals on the magneto-optical recording medium 6 by irradiating the magnetic field area MA with a light beam LB from the output end face 5 of the optical fiber 4.

Further, specific embodiments of the magneto-optical recording head device according to the present invention will be described with reference to the drawings.

As shown in FIGS. 2 and 3, the magneto-optical head section 10 constituting this magneto-optical recording head device is operated only in the vertical direction perpendicular to the disk surface 20A, which is the main surface of the magneto-optical disk 20. A magnetic head 11 is supported at the tip of a leaf spring 30 which is elastically displaced. The proximal end side of the leaf spring 30 that supported the magnetic head 11 is supported by a carrier section 40, which will be described later, via a first support section 31. The magnetic head 11 supported at the distal end side as a free end of the leaf spring 30 whose proximal end is fixedly supported on the carrier part 40 side in this way faces the disk surface 20A of the magneto-optical disk 20. By driving the magneto-optical disk 20 to rotate at high speed,
It comes to face the disk surface 20A at a constant distance via an air film layer formed on the disk surface 20A. That is, when an air film layer is formed by driving the magneto-optical disk 20 to rotate at high speed, the leaf spring 30 is elastically displaced in a direction perpendicular to the disk surface 20A, and the magnetic head 11 is raised above the disk surface 20A. Nasu. By maintaining the state in which the magneto-optical disk 20 is rotated at a predetermined rotation speed, the state of the air film layer formed by the rotation of the disk 20 becomes constant, and the magnetic head 1
1 and the disk surface 20A is maintained constant. At this time, the leaf spring 30 is attached to the disk surface 20A.
Since it is elastically displaced only in the direction orthogonal to the magnetic head 11, the distance between the magnetic head 11 and the disk surface 20A is reliably maintained constant.

The first support part 31 that supports the proximal end of the leaf spring 30 on the carrier part 40 is made of a soft magnetic material such as iron, and is made of a soft magnetic material such as iron. It is supported by the second support part 34 via a pair of leaf springs 32 and 33 that are elastically displaced only in the horizontal direction, and the magnetic pole faces of the tracking control yoke 35 are arranged to face both horizontal end faces of the second support part 34. It is arranged between the magnetic legs 36 and 37 of the tracking control yoke 35. The tracking coil 3 is wound around the tracking control yoke 35.
By displacing the first support section 31 in the horizontal direction with respect to the disk surface 20A of the magneto-optical disk 20 in accordance with the tracking control current applied to the magneto-optical disk 8, the magneto-optical head section 10 also moves in the same direction. The tracking control of this magneto-optical head section 10 is performed.

Furthermore, the second support section 34 and the tracking control yoke 35 are a carrier section that is guided by a guide shaft 39 and linearly moved in a direction parallel to the radial direction of the magneto-optical disk 20 by a drive device (not shown). 40, and the magneto-optical head section 10 is moved back and forth on the radius of the magneto-optical disk 20 as the carrier section 40 moves.

The magneto-optical head section 1 in this embodiment
0, the optical fiber 50 is connected from the carrier section 40.
One end of the optical fiber 50 is introduced into the magnetic head 11 and exposed to the outside from the magnetic gap part 12, and is provided so as to face the disk surface 20A of the magneto-optical disk 20. ing. Furthermore, inside the carrier section 40,
An optical head section for magneto-optical recording and reproducing is provided as schematically shown in FIG.
and the optical fiber 5 via the objective lens 44.
The information is irradiated onto the input/output end surface 52 of the other end of the optical fiber 50 and is guided to the magneto-optical head section 10 via the optical fiber 50, and is reflected on the disk surface 20A of the magneto-optical disk 20 to read information. A laser beam for use is guided to the optical head section through the optical fiber 50, and
The light is irradiated from the other end incident end surface 52 of the laser beam through the objective lens 44 and the polarizing beam splitter 43 onto a photodetector 45 for reading information.

In order to write information on the magneto-optical disk 20 using the magneto-optical recording head device configured as described above, a laser beam from the optical head section is guided to the magneto-optical head section 10 via the optical fiber 50, and the laser beam is directed to the magneto-optical head section 10 via the optical fiber 50. The recording track area of the magneto-optical disk 20 is heated by the beam spot of the laser beam in such a manner that the laser beam is continuously irradiated onto the disk surface 20A of the magneto-optical disk 20 from the magnetic gap portion 12 of 11. The above magnetic head 1
An excitation current modulated in accordance with a recording information signal is passed through one coil 13 to apply a recording signal magnetic field to the magnetic head 11, thereby performing magneto-optical recording by magnetic field modulation.

In addition, in order to read the information recorded on the magneto-optical disk 20, the excitation current flowing through the magnetic head 11 is cut off, and the application of the magnetic field by the magnetic head 11 is stopped. 20A is transmitted to the carrier section 40 via the optical fiber 50.
The information is read out optically by the photodetector 45.

In this way, the magnetic head 11 is attached to the disk surface 20.
Leaf spring 3 that can be elastically displaced only in the direction perpendicular to A
If the distance between the magneto-optical head section 10 and the disk surface 20A is kept constant by an air film layer formed on the disk surface 20A of the magneto-optical disk 20, special focusing control can be performed. There is no need to do so. In addition, a magneto-optical head section 10 is used, which is provided in the magnetic gap section 12 of the magnetic head 11 so that one end of the input/output end surface 51 of the optical fiber 50 is exposed to the outside, thereby emitting a laser beam for magneto-optical recording and reproducing. A photodetector 4 for reading information from the laser beam reflected by the semiconductor laser 41 and the magneto-optical disk 20
A magneto-optical head section 10 includes an optical head section including
By arranging it separately from the optical fiber 50 and guiding the laser beam for magneto-optical recording and reproducing, the magneto-optical head section 10 can be formed extremely easily and lightweight. Faster focusing and tracking control of the magnetic head section 10 is realized.

Furthermore, by performing magneto-optical recording using magnetic field modulation, it is possible to directly record new information on a recording track on which information has already been written, thereby omitting the erasing operation by so-called overwriting.

[Effect of idea]

As described above, in the magneto-optical recording head device according to the present invention, light is emitted from an optical head separate from the magnetic head via an optical fiber whose emitting end face faces the magnetic gap of the magnetic head. Information is recorded on the magneto-optical recording medium by irradiating a light beam onto the magnetic field area provided by the magnetic head. It has become smaller and lighter.

In addition, since the magneto-optical head section and the optical head section are separated, the effect of heat generated when an excitation current is supplied to the coil of the magneto-optical head section can be isolated from the optical head section. ,
When a semiconductor laser is used as a light source, stable operation of the semiconductor laser can be realized, and stable recording of information signals can be realized.

Furthermore, since the magneto-optical head section is supported on the tip side of an elastic member such as a leaf spring that can be elastically displaced only in a direction perpendicular to the main surface of the magneto-optical disk,
When the magneto-optical disk, which is a magneto-optical medium facing this magneto-optical head, is driven to rotate, an air film layer generated between the main surface of the magneto-optical disk and the magneto-optical head causes the main surface of the magneto-optical disk to be rotated. Since the head is elastically displaced so as to always maintain a constant distance from the head, a means for driving the magneto-optical head in the focus direction of the optical axis of the light beam becomes unnecessary, and the head device becomes simpler. will be realized.

In particular, when the magneto-optical head section is configured to be driven and displaced in the tracking direction based on a tracking control signal using an actuator,
Since the magneto-optical head section is made lighter and smaller, it can be driven with good followability to the tracking error signal, making it possible to realize accurate and rapid tracking control.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the basic structure of a magneto-optical recording head device according to the present invention. 2 and 3 show an embodiment of the present invention, FIG. 2 is an external perspective view of a magneto-optical recording head device of this embodiment, and FIG. 3 is an optical head device of the above embodiment. It is a schematic diagram showing the structure of a part. 1, 11... Magnetic head, 2, 12... Magnetic gap part, 4, 50... Optical fiber, 5, 51...
...Emission end face, 6... Magneto-optical recording medium, 10... Magneto-optical head section, 20... Magneto-optical disk, 40...
...Carriage, 41...Semiconductor laser.

Claims (1)

[Scope of Claim for Utility Model Registration] A carrier section that incorporates an optical head section including a light source and is guided by a guide shaft and is movable in a direction parallel to the radial direction of the magneto-optical disk, and a proximal end thereof is connected to the carrier section. A magneto-optical head is supported on the distal end side of an elastic member that is supported and can be elastically displaced only in a direction perpendicular to the main surface of the magneto-optical disk, and an incident end face on one end of the optical head is connected to a light beam of the optical head. an optical fiber disposed between the optical head and the magneto-optical head so as to face the output end and have the other end face facing the magnetic gap of the magneto-optical head. Magnetic recording head device.