JPH06195792A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To obtain a magneto-optical disk device which can be reduced in thickness. CONSTITUTION:The title device is provided with an exciting coil 3A and optical head 5 on the same side against a magneto-optical disk cartridge 2 and a gap section is provided in the iron core of the coil 3A so that a light beam can pass through the gap section. In addition, the iron core is notched and an objective lens 6 is set in the notched section. In addition, the coil 3A is fixed to such a position that the coil 3A approaches a magneto-optical disk 1 at the focusing time. Since the coil 3A and head 5 are provided on the same side against the cartridge 2 in such way, the space can be used effectively. In addition, since the lens 6 is set in the notched space of the iron core, the conventionally used objective lens 6 can be used. Moreover, since the coil 3a is fixed, the loading time can be shortened and vibrations can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device having a reduced overall thickness.

[0002]

2. Description of the Related Art The structure of a conventional magneto-optical disk device will be described with reference to FIG. FIG. 5 is a diagram showing a configuration of a conventional magneto-optical disk device shown in, for example, Kunimaro Tanaka's "Signal processing technology in optical recording" (Trikeps), pages 9 to 11, published in February 1989. Is.

In FIG. 5, 1 is a magneto-optical disk capable of recording and erasing data, and 2 is a magneto-optical disk 1.
Magneto-optical disk cartridges containing 3 and 4
Is an exciting coil and an iron core that generate a magnetic field necessary for recording or erasing data. Further, 5 is an optical head for controlling the optical system, and 6 is an objective lens for emitting a laser beam.
Further, 7 is a linear motor for moving the optical head 5 at the time of access.

Next, the operation of the above-mentioned conventional magneto-optical disk device will be described. First, when the magneto-optical disk cartridge 2 is loaded into the magneto-optical disk device,
Focus is applied by the optical head 5, and then the exciting coil 3 descends so as to approach the magneto-optical disk 1 in order to secure a magnetic field required for recording and erasing.

When recording or erasing data, first, a magnetic field is generated in a fixed direction by supplying a direct current to the exciting coil 3 arranged above the magneto-optical disk 1. Further, the linear motor 7 is used to drive the magneto-optical disk 1
After the optical head 5 is accessed and seeks to a predetermined track, laser light is emitted from the objective lens 6. By the above operation, recording on any track of the magneto-optical disk 1,
It is possible to erase it.

[0006]

In the conventional magneto-optical disk device as described above, the optical head 5 and the exciting coil 3 are arranged on the opposite side with the magneto-optical disk cartridge 2 interposed therebetween. Therefore, the magneto-optical disk cartridge 2
There is a problem that it is necessary to secure a space for arranging the exciting coil 3 on the upper side and a space for arranging the optical head 5 on the lower side.

Further, in order to use the conventional objective lens 6, there is a problem that it is necessary to shorten the focus distance.

Further, since the exciting coil 3 descends after the focus is applied, there is a problem that it takes time to load the magneto-optical disk 1 and vibrations occur.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a magneto-optical disk device which can be thinned.

It is another object of the present invention to obtain a magneto-optical disk device which can use a conventional objective lens.

Another object of the present invention is to obtain a magneto-optical disk device capable of reducing the loading time of the magneto-optical disk and preventing vibration.

[0012]

A magneto-optical disk device according to claim 1 of the present invention comprises the following means. [1] An exciting coil that has an iron core provided with a void and generates a magnetic field necessary for recording / erasing data. [2] An optical head provided on the same side as the exciting coil with respect to the magneto-optical disk cartridge, for recording and erasing data on the magneto-optical disk by passing a light beam through the void of the iron core.

A magneto-optical disk device according to claim 2 of the present invention comprises the following means. [1] An exciting coil that has an iron core provided with a concave space and generates a magnetic field necessary for recording / erasing data. [2] The magneto-optical disk cartridge is provided on the same side as the exciting coil, the objective lens is arranged in the concave space of the iron core, and the light beam passes through the concave space of the iron core to write data to the magneto-optical disk. Optical head for recording and erasing.

A magneto-optical disk device according to claim 3 of the present invention comprises the following means. [1] An exciting coil that has an iron core provided with a void and generates a magnetic field necessary for recording / erasing data. [2] It is provided on the same side as the exciting coil with respect to the magneto-optical disk cartridge, and is fixed at a position approaching the magneto-optical disk at the time of focusing, and the light beam passes through the void portion of the iron core and An optical head that records and erases data on the disc.

[0015]

In the magneto-optical disk device according to the first aspect of the present invention, the magnetic field necessary for recording and erasing data is generated by the exciting coil having the iron core provided with the void. Also, with an optical head provided on the same side as the exciting coil with respect to the magneto-optical disk cartridge,
The light beam passes through the void of the iron core to record / erase data on the magneto-optical disk.

In the magneto-optical disk device according to the second aspect of the present invention, the magnetic field necessary for recording and erasing data is generated by the exciting coil having the iron core provided with the concave space. An optical head provided on the same side as the exciting coil with respect to the magneto-optical disk cartridge and having an objective lens arranged in the concave space of the iron core causes a light beam to pass through the concave space of the iron core to generate a magneto-optical signal. Data is recorded / erased on the disc.

In the magneto-optical disk device according to the third aspect of the present invention, the magnetic field necessary for recording / erasing data is generated by the exciting coil having the iron core provided with the void. An optical head provided on the same side of the magneto-optical disk cartridge as the exciting coil and fixed at a position approaching the magneto-optical disk at the time of focusing causes a light beam to pass through the void portion of the iron core. Data is recorded / erased on the magneto-optical disk.

[0018]

【Example】

Example 1. Hereinafter, the configuration of the first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. First Embodiment FIG. 1 is a diagram showing a side surface of a main part of a first embodiment of the present invention. FIG. 2 is a view of the magneto-optical disk cartridge of the first embodiment shown in FIG. 1 seen from above. FIG. 3 shows FIG.
It is a figure which shows the cross section of the II surface shown in FIG.

In FIGS. 1 and 2, 1 is a magneto-optical disk, 2 is a magneto-optical disk cartridge containing the magneto-optical disk 1, 3A is an exciting coil, 4A is an iron core, 5 is an optical head, and 6 is an objective lens. , 7 are linear motors.
In each figure, the same reference numerals indicate the same or corresponding parts.

The structure of the first embodiment is the magneto-optical disk 1
The exciting coil 3A and the optical head 5 are arranged below the magneto-optical disk cartridge 2 in which the magnetic disk is stored.

FIG. 2 is a view of FIG. 1 seen from the above through the magneto-optical disk 1. The iron core 4A has a void at the center, and the structure allows laser light to pass therethrough. There is.

FIG. 3 is a sectional view taken along the line I--I in FIG. 2, but shows a state in which the iron core 4A is notched and the objective lens 6 is arranged in that space in order to shorten the focus distance. ing.

Next, the operation of the above-described first embodiment will be described. The basic operation is the same as the conventional example except that the laser light passes through the void portion of the iron core 4A.

That is, first, when the magneto-optical disk cartridge 2 is loaded in the magneto-optical disk device, the optical head 5 focuses it.

When recording or erasing data, a magnetic field is generated in a fixed direction by applying a direct current to the exciting coil 3A arranged below the magneto-optical disk 1.
Further, after the optical head 5 is accessed and seeks to a predetermined track of the magneto-optical disk 1 by using the linear motor 7,
Laser light is emitted from the objective lens 6. At this time, the center of the iron core 4A is a void portion of the cutout space, and the laser light passes therethrough. By the above operation, recording, erasing, etc. on any track of the magneto-optical disk 1 can be performed.

In the first embodiment, the exciting coil 3A
Is fixed in advance to a position approaching the magneto-optical disk 1 at the time of focusing.

That is, as described above, when the magneto-optical disk cartridge 2 is loaded in the magneto-optical disk device, the optical head 5 focuses it. After the focus was applied, the exciting coil 3 which was conventionally on the upper part of the magneto-optical disk cartridge 2 dropped and came close to the magneto-optical disk 1, but in the first embodiment, the exciting coil 3A is fixed and does not move.

The first embodiment of the present invention, as described above,
The purpose is to reduce the thickness of the entire device. Therefore,
An exciting coil 3A and an optical head 5 are provided on the same side of the magneto-optical disk cartridge 2, and a gap is provided in an iron core 4A of the exciting coil 3A so that a light beam can pass therethrough. Further, the iron core 4A is notched, and the objective lens 6 is arranged in the space. Furthermore, the exciting coil 3A is fixed at a position approaching the magneto-optical disk 1 at the time of focusing. As a result, the exciting coil 3A and the optical head 5 are provided on the same side with respect to the magneto-optical disk cartridge 2.
By including the above, the space can be effectively used.
Further, by arranging the objective lens 6 in the cutout space of the iron core 4A, the objective lens 6 which has been conventionally used can be used. Further, by fixing the exciting coil 3A, the loading time can be shortened and vibration can be suppressed.

That is, a magneto-optical disk 1 capable of recording and erasing data, a magneto-optical disk having an exciting coil 3A for recording data on the magneto-optical disk 1 or erasing recorded data, and an optical head 5. In the disk device, the exciting coil 3A and the optical head 5 are provided on the same side with respect to the magneto-optical disk cartridge 2, and a space is provided in the iron core 4A of the exciting coil 3A so that the light beam can pass through the iron core 4A. It is a magneto-optical disk device characterized by the above. The iron core 4A is notched, and the objective lens 6 is arranged in the notched space. Further, by utilizing that the exciting coil 3A is arranged below the magneto-optical disk cartridge 2, the exciting coil 3A is previously fixed at a position approaching the magneto-optical disk 1 at the time of focusing. It is a thing.

Therefore, by providing the optical head 5 and the exciting coil 3A on the same side with respect to the magneto-optical disk 1,
The magneto-optical disk device can be thinned. Further, the objective lens 6 which has been used conventionally can be used. Further, by fixing the exciting coil 3A, it is possible to shorten the loading time and suppress the vibration when descending.

Example 2. In the first embodiment described above, the iron core 4
Although the notch was made in A, in the second embodiment, as shown in FIG. 4, the iron core 4B may be concave.

[0032]

As described above, the magneto-optical disk device according to claim 1 of the present invention has an exciting coil which has an iron core provided with a void and which generates a magnetic field necessary for recording / erasing data. , Is provided on the same side of the magneto-optical disk cartridge as the exciting coil, and a light beam passes through the void of the iron core to record data on the magneto-optical disk.
Since it has an erasing optical head, the whole device can be thinned, a conventional objective lens can be used, and further, the loading time of the magneto-optical disk and vibration can be prevented. Produce an effect.

As described above, the magneto-optical disk device according to claim 2 of the present invention has an iron core provided with a concave space, an exciting coil for generating a magnetic field necessary for recording / erasing data, and an optical coil. It is provided on the same side of the magnetic disk cartridge as the exciting coil, the objective lens is arranged in the concave space of the iron core, and the light beam passes through the concave space of the iron core to record / erase data on the magneto-optical disk. Since the optical head is provided, the entire device can be thinned, the conventional objective lens can be used, and further, the loading time of the magneto-optical disk and the vibration can be prevented. Play.

As described above, the magneto-optical disk device according to claim 3 of the present invention has an iron core provided with a void portion, an exciting coil for generating a magnetic field necessary for recording / erasing data, and an optical coil. It is provided on the same side of the magnetic disk cartridge as the exciting coil, and is fixed at a position close to the magneto-optical disk at the time of focusing, and a light beam passes through the void portion of the iron core to transfer data to the magneto-optical disk. Since it has an optical head for recording and erasing, it is possible to make the whole device thinner, use a conventional objective lens, and shorten the loading time and prevent vibration of the magneto-optical disk. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a partial configuration of a first embodiment of the present invention.

FIG. 2 is a view of the first embodiment of the present invention shown in FIG. 1 seen from above through a magneto-optical disk cartridge.

FIG. 3 is a view showing a cross section taken along the line I-I shown in FIG.

FIG. 4 is a diagram showing a cross section of a concave iron core according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of a conventional optical disc device.

[Explanation of symbols]

 1 Magneto-optical disk 2 Magneto-optical disk cartridge 3A Excitation coil 4A, 4B Iron core 5 Optical head 6 Objective lens 7 Linear motor

Claims (3)

[Claims] 1. An exciting coil which has an iron core provided with a void and which generates a magnetic field necessary for recording / erasing data, and an exciting coil which is provided on the same side of the magneto-optical disk cartridge as the exciting coil. A magneto-optical disk device comprising an optical head for recording / erasing data on / from a magneto-optical disk by passing a beam through the void of the iron core. 2. An exciting coil which has an iron core provided with a concave space and which generates a magnetic field necessary for recording / erasing data.
And a magneto-optical disk cartridge provided on the same side as the exciting coil, an objective lens is arranged in the concave space of the iron core, and a light beam passes through the concave space of the iron core to record data on the magneto-optical disk. A magneto-optical disk device having an erasing optical head. 3. An exciting coil having an iron core provided with a void portion, which is provided on the same side as the exciting coil with respect to a magneto-optical disk cartridge, and an exciting coil for generating a magnetic field necessary for recording / erasing data. A magneto-optical disk, which is fixed to a position close to the magneto-optical disk at the time of focusing, and has an optical head for recording / erasing data on / from the magneto-optical disk by passing a light beam through the void portion of the iron core. apparatus.