JPH0261845A - Magneto-optical recording medium driving device - Google Patents

Abstract

PURPOSE:To simplify the structure of a head and to enable overwrite by access from one plane of a magneto-optical recording medium to be performed by providing the optical system of an optical head on a floating type magnetic head, and unifying the magnetic head with the optical system. CONSTITUTION:A circular shape magneto-optical disk 5 is constituted of a substrate 5a and an amorphous magnetic layer 5b laminated on the substrate 5a. The floating type magnetic head 1 is faced with the upper plane of the disk 5, and the head 1 is mounted on one end of a bracket 4 having elasticity, and it is floated over the disk 5 by several microns against the elastic force of the bracket 4 by dynamic pressure. Also, the head 1 is formed in rectangular flat shape and a sliding part 11 is floated by the dynamic pressure, and a coil 13 is wound across a core 12 having an almost U-shaped side plane and one side of the core 12. Also, the optical system 2 of the optical head consolidated in a space less than 100 microns is provided on the downstream of the coil 13 on one side of the core 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical disk drive, and particularly to improvements in its optical head and magnetic head.

[Conventional technology]

A magneto-optical disk drive device was developed as a device for driving a rewritable large-capacity storage medium, and there are two types of recording methods: an optical modulation method and a magnetic field modulation method. The optical modulation method records information signals by modulating them into flashes, and it is necessary to align the direction of magnetization before recording.
For this reason, it was necessary to rotate the disk once for erasing, or to provide a separate erasing head. Furthermore, the magnetic field modulation method records information signals by modulating them in the direction of a magnetic field, and can perform erasing and recording at the same time, allowing high-speed access. However, compared to the optical modulation method, this method requires the magnetic head to be placed several microns closer to the disk. Conventionally, a head with a structure similar to the floating head used in fixed magnetic disk drives was used as the magnetic head. The magnetic head is placed close to the disk.

[Problem to be solved by the invention]

In either type of magneto-optical disk drive, conventionally, a laser beam generated from a laser source of an optical head is focused on one surface of the disk to a diameter of 1 to 2 microns, and a laser beam that is opposite to the irradiation position is irradiated. A magnetic head is installed on the surface,
A bias magnetic field was applied. Therefore, the optical head and the magnetic head face each other on both sides of the disk, making the structure complicated and also limiting high-speed access to the disk.

On the other hand, 2, which was announced at the Optical Memory Symposium 1985 (P165, December 1985), integrated an optical head and a magnetic head and enabled access from one side.
There is a head-type magneto-optical disk device. This has separate heads for recording and reproduction, and the magnetic head is a permanent magnet. However, since this magneto-optical disk device has a two-handed structure, it is expensive and has a complicated structure.

This invention was made in view of the above circumstances, and by providing an optical head optical system to a floating magnetic head, it is possible to perform override for simultaneously erasing and recording from one side of the disk using light and magnetic fields. The object of the present invention is to obtain a magneto-optical recording medium drive device with a simplified structure.

[Means for Solving the Problems] A magneto-optical recording medium drive device according to the present invention includes a floating magnetic head provided with an optical system of an optical head.

[Effect]

According to this invention, the floating magnetic head is provided with the optical system of the optical head, and the magnetic head and the optical system are integrated, which simplifies the structure of the head and allows access from one side of the magneto-optical recording medium. Allow override.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment thereof.

FIG. 1 is a cutaway perspective view showing a part of a magneto-optical recording medium drive device (hereinafter referred to as the drive device) according to the present invention, and FIG. 2 is an enlarged front view of a magnetic head. In FIG. 1, 5 is a disc-shaped magneto-optical disk (hereinafter referred to as a disk), and the disk 5 has a substrate 5a and an amorphous magnetic layer 5b laminated on the substrate 5a. . A floating magnetic head 1 faces the upper surface of the disk 5. The head 1 is attached to one end of an elastic bracket 4, and the dynamic pressure generated by the rotation of the disk 4 in the direction of the arrow causes the elasticity of the bracket 4 to be It resists the force and floats up several microns from the disk 4.

The magnetic head l has a rectangular flat plate shape, and includes a slider section 11 that floats due to the dynamic pressure, a core 12 that is attached to one end of the slider section 11 and has a substantially U-shaped side surface, and one side of the core 12 ( It has a coil 13 wound around a 100 micron square cross section.

Further, below the coil 13 on one side of the core 12, an optical system 2 of an optical head is provided which is arranged in a space of 100 microns or less. The optical system 2 is provided with the following items. That is, the semiconductor laser element 21, the heat sink 22 that radiates heat from the semiconductor laser element 21, and the semiconductor laser element 21 are placed in the emission direction of the semiconductor laser element 21.
A collimator lens 23 for collimating laser light emitted from the disc 5 at a predetermined radiation angle and a beam splinter 24 for separating light incident on the disk 5 from light reflected therefrom are disposed in this order. The beam splinter 24
An objective lens 25 is disposed in the transmission direction for focusing the laser beam incident on the disk 5 into a spot with a diameter of 1 to 2 microns.

On the other hand, in the reflection direction of the beam splitter 24, a λ/2 plate 26 that rotates the polarization plane of the reflected light by 45 degrees and a polarizing beam splitter 27 that transmits and reflects the reflected light depending on the polarization plane are provided. There is.

Further, a photodiode 29 is provided in the transmission direction of the polarization beam splitter 27 to detect the tracking error by receiving the reflected beam with a plurality of light receiving surfaces, and a photodiode 28 is provided in the reflection direction of the polarization beam splitter 27 to detect the polarization angle. is provided.

Further, the outputs of the photodiodes 29 and 28 are given to the preamplifier 3 which generates a reproduced signal RF.

The drive device of the present invention configured as described above uses a magnetic field modulation method to irradiate the disk 5 with a constant amount of laser light during recording, and modulates the laser light from the magnetic head 1 according to the recording signal RS. The magnetic field thus obtained is applied to the magnetic layer 5b to perform recording. Further, during reproduction, a reproduction signal RF is generated by the preamplifier 3 based on the output signals of the photodiodes 28 and 29. Furthermore, the magnetic head 1 during recording and erasing
The tracking control is performed by servo control according to the amount of light received by the plurality of light receiving surfaces of the photosensor 28. Also, the magnetic head
Since it is a floating type, the flying height is stable, so there is no need to perform focus control by determining the focal length of the objective lens 25 according to the flying height.

In this embodiment, the optical system is constructed using optical components such as ultra-small lenses, but the present invention is not limited to this, and the optical system may be constructed using integrated optical components such as a guiding waveguide. Needless to say.

[Effects of the Invention] As explained above, in this invention, the optical system of the magneto-optical disk drive device is ultra-miniaturized and installed in a floating magnetic head, so that the bias magnetic field and laser beam can be applied from one side of the disk. This has the effect of providing a magneto-optical recording medium drive device that can irradiate light, enable override by magnetic field modulation, and has a simplified structure.

[Brief explanation of the drawing]

FIG. 1 is a partially cut away perspective view of a magneto-optical recording medium drive device according to the present invention, and FIG. 2 is an enlarged front view of a magnetic head. Reference numerals 1... Stone head disk 2... Optical system 5... Optical magnetism Note that in the drawings, the same reference numerals indicate the same or corresponding parts. Procedural amendment (spontaneous) 1. Indication of the case Patent application 1986, Name of the invention Magneto-optical recording medium drive device 3. Person making the amendment Relationship to the case Patent applicant address 2-2 Marunouchi, Chiyoda-ku, Tokyo 3. Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Acting Address Mitsubishi Electric Corporation, 2-2-3 Marunouchi, Chiyoda-ku, Tokyo (7375) Patent Attorney Masuo Oiwa, \, (Contact information: 03 (213) 3421 Permits Department) 5. Column 6 of “Detailed Description of the Invention” of the specification to be amended. Contents of the amendment (1) In the 5th line of the 5th page of the specification, r (100 "r (1000 micron square cross section)"
I am corrected. (2) In lines 7 and 8 of page 5 of the specification, the statement "100 microns below the coil 13" is corrected to "1000 microns below the coil 13."that's all

Claims (1)

[Claims] 1. A magneto-optical head comprising an optical head having an optical system that irradiates coherent light onto a magneto-optical recording medium, and a floating magnetic head that applies a bias magnetic field to the irradiation position of the optical head. A magneto-optical recording medium drive, characterized in that the magnetic head is provided with the optical system.