JPH0487040A - Magneto-optical disk device for double-sided magneto-optical disk - Google Patents

Abstract

PURPOSE:To halve the number of driving systems needed for shift of the heads by holding a double-sided magneto-optical disk between the 1st and 2nd head parts and arranging the 1st and 2nd magneto-optical head laser emitting parts and the 1st and 2nd auxiliary magnetic heads toward the surface of the magneto-optical disk. CONSTITUTION:A laser emitting part 4 which has an access to the upper side surface of a double-sided magneto-optical disk is provided on a head housing 15 together with an auxiliary magnetic head 3 which has an access to the rear side surface of the disk 2. At the same time, another part 4 which has an access to the rear side surface of the disk 2 is provided on another housing 15 together with another head 3 which has an access to the upper side surface of the disk 2 respectively. In such a constitution, only two head driving systems 5 are needed for shift of both housings 15, 15 in regard of the shift of both heads 3. As a result, the number of driving systems can be halved and the heads and a disk device can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical disk device for a double-sided magneto-optical disk, and particularly to the structure of its magneto-optical head and auxiliary magnetic head.

[Conventional technology]

Conventionally, in a magneto-optical disk device for a double-sided magneto-optical disk that employs a magnetic field modulation method, the magneto-optical head section has a structure as shown in FIG. A head drive system 10 is provided at both ends of the head housing 13. Further, the auxiliary magnetic head section has a structure as shown in FIG. 4, in which the auxiliary magnetic head 11 is provided on the head housing 14 and
A head drive system 12 is provided at both ends.

The magneto-optical head section and the auxiliary magnetic head section are arranged with respect to the double-sided magneto-optical disk as shown in FIG. That is, the first magneto-optical head section 61 is arranged on the front side of the disk 8 with its laser emitting section facing the surface of the disk 8, while the first auxiliary magnetic head section 71 paired with this head section is arranged on the front side of the disk 8. The auxiliary magnetic head is placed on the back side with its auxiliary magnetic head facing the surface of the disk 80. Also, the second
The magneto-optical head section 62 is arranged on the back side of the disk 8 with its laser emitting section facing the surface of the disk 8, while the second auxiliary magnetic head section 72 paired with this head section is arranged on the front side of the disk 8 with its auxiliary magnetic head section 72 arranged on the front side of the disk 8. The magnetic head is placed facing the surface of the disk 8.

In the conventional magneto-optical disk device configured as described above, when accessing the front side of the disk 8, the auxiliary magnetic head section 71 is moved by the head drive system so that the auxiliary magnetic head comes to the area of the disk 8 that should be accessed. The auxiliary magnetic head is moved and applies a magnetic field to a predetermined portion of the disk 8. On the other hand, the magneto-optical head section 61 is moved by the head drive system so that its laser emitting section comes to the area of the disk 8 that should be accessed, and the laser emitting section irradiates the laser beam to the area of the disk 8 where the magnetic field is acting. do.

When accessing the back side of the disk 8, the auxiliary magnetic head section 72 is moved by the head drive system so that the auxiliary magnetic head comes to the area of the disk 8 that should be accessed, and the auxiliary magnetic head is moved to a predetermined position on the disk 8. Apply a magnetic field to the part. On the other hand, the magneto-optical head section 62 is moved by the head drive system so that its laser emitting section comes to the area of the disk 8 that should be accessed, and the laser emitting section irradiates the laser beam to the area of the disk 8 where the magnetic field is acting. do.

[Problem to be solved by the invention]

In this way, in the conventional magneto-optical disk drive, in order to access a certain position on the front side of the disk, it is necessary to move the head section 61 and head section 71, respectively, and in order to access a certain position on the back side of the disk, it is necessary to move the head section 61 and the head section 71 respectively. It is necessary to move the head section 62 and the head section 72, respectively. In other words, in a conventional magneto-optical disk drive, four drive systems must be installed to move the head, which not only takes time and effort to manufacture, but also limits the space within the magneto-optical disk drive, making it difficult for the device and the head to move. This made it difficult to miniaturize and use multiple heads.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a magneto-optical disk device for double-sided magneto-optical disks in which the number of drive systems required for head movement is halved.

[Means to solve the problem]

A magneto-optical disk device for a double-sided magneto-optical disk according to the present invention includes a first head housing, a first magneto-optical head laser emitting section disposed thereon, and a first auxiliary magnetic head. a first head section, a second head housing, a second magneto-optical head laser emitting section disposed thereon, and a second head housing;
an auxiliary magnetic head; the first and second head sections sandwich a double-sided magneto-optical disk; The present invention is characterized in that first and second auxiliary magnetic heads are arranged toward the surface of the double-sided magneto-optical disk.

Further, the magneto-optical disk device of the present invention is characterized by comprising a first head drive system that drives a first head housing, and a second head drive system that drives a second head housing.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 2 shows a magneto-optical head section of a magneto-optical disk device for a double-sided magneto-optical disk which is constructed based on the present invention and employs a magnetic field modulation method. This head section is constructed by providing a laser emitting section 4 and an auxiliary magnetic head 3 on a head housing 15, and further providing a head drive system 5 at both ends of the head housing 15. This magneto-optical head section is arranged with respect to the double-sided magneto-optical disk 2 as shown in FIG.

That is, the first magneto-optical head section 101 is arranged on the front side of the disk 2 with its laser emitting section 4 and auxiliary magnetic head 3 facing the surface of the disk 2, while the second magneto-optical head section 102 is arranged on the front side of the disk 2. The laser emitting section 4 and the auxiliary magnetic head 3 are arranged on the back side of the disk 2 with the laser emitting section 4 and the auxiliary magnetic head 3 facing the surface of the disk 2.

Next, the operation will be explained. When accessing a predetermined position on the front side of the disk 2, the head drive system 5 of the head unit 102 moves the head unit 102 (in the direction of the arrow) so that the auxiliary magnetic head 3 comes to the above-mentioned predetermined position. On the other hand, the head drive system 5 of the head section 101 moves the head section 101 (in the direction of arrow A) so that the laser emitting section 4 comes to the above-mentioned predetermined position. Then, at the predetermined position on the disk, the auxiliary magnetic head 3 of the head section 102 applies a magnetic field to the disk 2, and the laser emitting section 4 of the head section 101 irradiates a laser beam. Further, when accessing a predetermined position on the back side of the disk 2, the head drive system 5 of the head section 101 moves the head section 101 so that the auxiliary magnetic head 3 comes to the above-mentioned predetermined position. On the other hand, the head drive system 5 of the head section 102 moves the head section 102 so that the laser emitting section 4 is at the above-mentioned predetermined position. Then, at the predetermined position on the disk, the auxiliary magnetic head 3 of the head section 101 applies a magnetic field to the disk 2, and the laser emitting section 4 of the head section 102 irradiates a laser beam.

As described above, in the magneto-optical disk device for double-sided magneto-optical disks of the present invention, a laser emitting part for accessing the front surface of the disk and an auxiliary magnetic head for accessing the back surface are provided on one head housing. A laser emitting section for accessing the back side of the disk and an auxiliary magnetic head for accessing the front side of the disk are provided on the other head housing, so that head movement requires It is only necessary to provide two drive systems for moving these two head casings.

[Effects of the Invention] As explained above, the present invention provides a first head housing including a first head housing, a first magneto-optical head laser emitting section disposed thereon, and a first auxiliary magnetic head. a second head unit configured by a second head unit, a second head housing, a second magneto-optical head laser emitting unit disposed thereon, and a second auxiliary magnetic head; 1st and 2nd
The head portions sandwich the double-sided magneto-optical disk, and the first and second magneto-optical head laser emitting sections and the first and second auxiliary magnetic heads are arranged facing the surface of the double-sided magneto-optical disk. Features.

That is, in the magneto-optical disk device for double-sided magneto-optical disks of the present invention, a laser emitting section for accessing the front surface of the disk and an auxiliary magnetic head for accessing the back surface are provided on one head housing. A laser emitting unit for accessing the back side of the disk and an auxiliary magnetic head for accessing the front side of the disk are provided on the other head housing, so these two are required for head movement. It is only necessary to provide two drive systems for moving the two head casings.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a portion related to a magneto-optical head section of a magneto-optical disk device for a double-sided magneto-optical disk according to the present invention, and FIG. 2 is a perspective view showing details of the magneto-optical head section shown in FIG. 1. , FIG. 3 is a perspective view showing a magneto-optical head section of a conventional magneto-optical disk device for double-sided magneto-optical disks, and FIG. 4 shows an auxiliary magnetic head section of a conventional magneto-optical disk device for double-sided magneto-optical disks. 5 is a perspective view showing how the head shown in FIGS. 3 and 4 is arranged with respect to a double-sided magneto-optical disk. 2...Double-sided magneto-optical disk 3...Auxiliary magnetic head 4...Laser emitting section 5...Head drive system 15...Head housing 10L 102...・Magneto-optical head section

Claims (2)

[Claims] (1) A first head unit composed of a first head housing, a first magneto-optical head laser emitting unit disposed thereon, and a first auxiliary magnetic head, and a second head housing. and a second head section configured by a second magneto-optical head laser emitting section and a second auxiliary magnetic head disposed on the body, and the first and second head sections are arranged on both sides. The first and second magneto-optical head laser emitting sections and the first and second auxiliary magnetic heads are arranged to face the surface of the double-sided magneto-optical disk with a magneto-optical disk in between. A magneto-optical disk device for double-sided magneto-optical disks. (2) The double-sided magneto-optical disk according to claim 1, further comprising a first head drive system that drives the first head housing and a second head drive system that drives the second head housing. magneto-optical disk device.