JPH041955A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To simultaneously perform the record, the reproduction and the erasure on both sides of an optical disk which is stored in a cartridge containing a normal access window by setting a beam spot scanning position at a point on a line distant away from the linear symmetrical axis of the disk by a fixed distance. CONSTITUTION:A 1st optical head 1 is provided together with a 1st bias magnetic field generator 4 provided at a position opposite to the head 1 centering on an optical disk 3, a 2nd optical head 6 provided at a position adjacent to the generator 4, and a 2nd bias magnetic field generator 7 provided at a position opposite to the head 6 and also adjacent to the head 1 respectively. Then the movable directions of both head 1 and 6 are set approximately in parallel to each other. As a result, the record, the reproduction and the erasure are simultaneously carried out on both sides of the disk 3 stored in a cartridge containing an access window which is formed in the fixed width along the linear symmetrical axis of the disk surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical disk device that performs recording, reproduction and erasing using both an optical head and a bias magnetic field generator.

[Conventional technology]

Conventionally, this type of magneto-optical disk device operates the optical head and its drive so that as the optical head moves, a light beam emitted from the objective lens of the optical head scans on the line symmetry axis (radius) of the optical disk surface. A bias magnetic field generator was installed at a position facing the optical head across the optical disk.

[Problem to be solved by the invention]

However, in the above-mentioned conventional magneto-optical disk device, since there is only one optical head and one bias magnetic field generator, when recording, reproducing, or erasing is performed on one side of the optical disk, recording, reproducing, or erasing is performed on the other side. could not be done. In addition, in order to solve the above-mentioned drawbacks, it is conceivable to create a magneto-optical disk device that has a pair of optical heads and a bias magnetic field generator for each surface of the optical disk, but as mentioned above, the optical head In order to scan along the axis of symmetry of the optical disc surface, the two optical heads, one for the wearer and the other for the back, are forced to scan positions slightly apart radially on the optical disc surface. It cannot be applied to an optical disk housed in a cartridge having an access window formed with a constant width along the axis of symmetry of the plane.

An object of the present invention is to eliminate the above-mentioned drawbacks, and to enable simultaneous recording, playback, and erasing of both sides of an optical disc housed in a cartridge having an access window formed with a constant width along the axis of line symmetry of the optical disc surface. The purpose of the present invention is to provide a magneto-optical disk device.

[Means to solve the problem]

The magneto-optical disk device of the present invention is a magneto-optical disk device that performs recording, reproduction and erasing on an externally mounted optical disk using both an optical head and a bias magnetic field generator, the magneto-optical disk device comprising: a first optical head; a first optical head installed at a position facing the first optical head across the optical disk;
a second optical head disposed adjacent to the first bias magnetic field generator;
a second bias magnetic field generator installed at a position facing the second optical head across the optical disk and adjacent to the first optical head; The movable directions of the optical heads are arranged generally parallel to each other.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

The first optical head 1 is mounted on a base 8 on which a spindle 2 is installed, and a first support mechanism 13 is movable in the radial direction of the optical disk 3 and parallel to the surface of an optical disk 3 mounted on the spindle 2 from the outside. is held by 1st
The bias magnetic field generator 4 is connected to a sub-base 5 connected to the base 3 by a connecting means (not shown) on the opposite side of the first optical head 1 across the optical disk 3.
The optical head 1 is fixed at a position facing the first optical head 1 above. The second optical head 6 is movable in the same direction as the first optical head l by a second support mechanism 63 at a position adjacent to the first bias magnetic field generator 4 on the sub-base 5. Retained. Second bias magnetic field generator 7
is fixed on the base 8 at a position facing the first optical head l.

Here, a first beam spot 12 formed on the optical disk surface by a light beam emitted from an objective lens 11 mounted on the first optical head 1 is moved as the first optical head 1 moves. Then, the optical disk moves on a line a certain distance away from one axis of symmetry on the optical disk surface, and further, recording, reproduction, and erasure are performed by interaction with the bias magnetic field generated by the first bias magnetic field generator 4. . Further, an objective lens 61 mounted on the second optical head 6
As the second optical head 6 moves, a second beam spot 62 formed on the optical disk surface by a light beam emitted from The beam moves on a line at a certain distance in the opposite direction to the first beam spot 61 with respect to the linear symmetry axis on the optical disk surface, and interacts with the bias magnetic field generated by the second bias magnetic field generator 7. Recording, reproducing, and erasing are performed.

Here, the first and second optical heads 1 and 6, as well as the method of movably supporting these optical heads and the method of driving them, may be the same as those in conventional optical disk devices. For example, an optical head having a protruding lens actuator section including an objective lens is supported on a guide rail fixed to a base via a bearing attached to the optical head, and fixed to a coil attached to the optical head and the base. A common configuration is a configuration in which the VCM is driven by a VCM configured with a magnetic circuit. Furthermore, the bias magnetic field generator may be of a type that mechanically inverts a permanent magnet, or a type that uses an electromagnet, or is similar to that used in conventional optical disk devices.

With the configuration described above, it is possible to compactly configure an optical head and a bias magnetic field generator for simultaneously using one side and another side of an optical disk.

For convenience of explanation, the first bias magnetic field generator 4. is shown in the plan view of FIG. Sub bass 5. The second optical head 6, the second support mechanism 63, and the spindle 2 are omitted in the side view.

〔Effect of the invention〕

As explained above, the present invention makes it possible to scan the beam spot on a line that is a certain distance away from the axis of linear symmetry of the optical disk. The optical disk generator can be constructed compactly without interfering with each other, and as a result, it can be housed in a cartridge having a normal access window formed with a constant width along the axis of line symmetry of the optical disk surface mentioned above. It is possible to realize a magneto-optical disk device that can simultaneously perform recording and erasing on both sides of an optical disk.

[Brief explanation of drawings]

FIG. 1 is a three-sided view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...First optical head, 2...Spindle, 3...Optical disk, 4...First bias magnetic field generator, Death... ...Sub bass, 6
...Second optical head, 7...Second bias magnetic field generator, 8...Base, 11.6
DESCRIPTION OF SYMBOLS 1... Objective lens, 12... First beam spot, 13... First support mechanism, 62
...Second beam spot, 63...
Second support mechanism. Agent Patent Attorney Susumu Uchihara

Claims (2)

[Claims] (1) In a magneto-optical disk device that records and reproduces information on a removable cartridge-type magneto-optical disk medium having an access window, a first
and a second recording and reproducing means that accesses a second surface opposite to the first surface of the magneto-optical disk medium. The scanning line of the first recording and reproducing means and the scanning line of the second recording and reproducing means are symmetrical about a certain radius of the magneto-optical disk medium and scan a line other than the radius of the magneto-optical disk medium. A magneto-optical disk device characterized by: (2) The magneto-optical disk device according to claim 1, wherein the scanning line of the first recording/reproducing means and the scanning line of the second recording/reproducing means are arranged in parallel.