JPS6346642A - Magneto-optical recorder - Google Patents

Abstract

PURPOSE:To assure the intensity of a magnetic field by number of times of winding of coil by providing a stopper to a driving system unit and using the stopper so as to position the recording medium of an auxiliary magnetic application means in a vertical direction, thereby halving the distance between the auxiliary magnetic field application means and a magneto-optical medium. CONSTITUTION:A projection 11a provided to the side end of the electromagnetic 10 of a support member 11 supporting a clamping member 4 and the electromagnet 10 is engaged with the stopper 16 fitted to a base 5 via a vibration proof member 17. The height of the stopper 16 is selected so that the clamping member 4 supports the optical disk 1 surely against a turntable 3 properly when the supporting member descends and the projection 11a is locked to the stopper 16. The positioning of height of the electromagnet 10 to the turntable 3 is attained with high accuracy by improving the accuracy of component of the stopper 16 and the vibration proof member 17 and the distance between the electromagnet 10 and the optical head 6 under the magnet 10 is kept within 1mm in total. Thus, the intensity of the magnetic field applied to the magneto- optical recording medium is assured by a few number of times of winding of coil.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an optical recording device that records, reproduces, and erases information on a magneto-optical recording medium through cooperation between a light beam and a magnetic field. In particular, the magneto-optical recorder M? is improved so as to shorten and stabilize the relative distance between the auxiliary magnetic field applying means for generating the magnetic field and the recording medium. Regarding placement.

Magneto-optical recording media that can be used in this apparatus include disk-shaped, card-shaped, and other various forms.

(Prior Art) In recent years, magneto-optical disks have been used as information recording media for rewriting large amounts of information.

To record information on such a magneto-optical disk, a perpendicularly magnetized film is formed on the disk surface, the magnetization direction of this perpendicularly magnetized film is aligned in one direction, and then the magneto-optical disc is digitally modulated by an information signal. A laser beam is irradiated onto the perpendicularly magnetized film to bring the temperature of the irradiated area to the Curie point temperature. Therefore, when an auxiliary magnetic field is applied to the region, the magnetization direction at the region is reversed to the direction of the applied magnetic field. and,
When the laser beam irradiation situation changes due to the movement of the recording medium, the temperature of the area decreases again, and a stable magnetization state is maintained while the direction of the ``ai'' direction is changed.In this way, the recording pit array according to the information signal is is formed.

On the other hand, in order to erase information recorded on a magneto-optical disk, a laser beam is irradiated onto a predetermined recording pit portion, and an auxiliary magnetic field with a magnetization direction opposite to that of the recorded bit is applied.
This is done by aligning the magnetization directions of the perpendicularly magnetized films again.

A general example of the above magneto-optical disk device is shown in FIGS. 2 and 3, and its outline will be explained below. FIG. 2 is a side view of a part of the main portion in longitudinal section, and FIG. 3 is a perspective view thereof.

The magneto-optical disk system! 116 is configured to sandwich the disk cassette 15 containing the optical disk 1, and is provided with a magnetic field applying means on the upper side, and a spindle motor 2 and an optical disc 6 on the lower side for rotating the optical disk 1. .

The optical head 6 is movable back and forth in the radial direction of the optical disc l along a guide rod 7 provided on the base 5, and the reciprocating movement of the optical head 6 is caused by moving the base so that the reciprocating movement of the optical head 6 corresponds to the radial direction of the optical disc l. This is done by electromagnetic force generated by a permanent magnet 8 provided in the optical head 5 and a coil 9 provided in the optical head 6.

On the other hand, a turntable 3 is attached to a rotating shaft of a motor 2 held on a base 5, and when in use, a disk cassette 15 is loaded onto the turntable 3 by a loading mechanism (not shown). Disc cassette 15?
After c@, the clamp member 4 supported by the support member 11 moves downward and presses down the optical disc l in the disc cassette 15 in its central area, and as the motor 2 rotates, the optical disc l on the turntable 3 is moved downward. It rotates together with the clamp material 4.

Incidentally, the disk cassette 15, as shown in FIG.
Corresponding parts of the clamp material 4 and the optical disc 6 are cut out, and #the central peripheral area of the optical disc 1 is exposed in the upper and lower parts in the cutout area, and #the exposed area of the optical disc 1 is exposed. , the clamp member 4 is engaged from above, and the turntable 3 is engaged from below. The disc cassette 15 is provided to protect the optical disc l housed therein from various external factors, and a shutter 18 is provided in the central area of the disc cassette 15. When the disc is taken out from the magneto-optical disc mount M16, the shutter 18 is slid to the center area of the disc cassette 15 to protect the exposed area of the optical disc 1, and when the disc cassette 15 is loaded into the mount W116, the shutter 18 is The disc cassette 15 is slid outward from the central area, and the central area of the optical disc l is exposed.

As described above, the support member 11 that supports the clamp member 4 is further provided with electromagnets 10 as auxiliary magnetic field applying means in correspondence with the radial direction of the optical disc 1.

The support member 11 provided with the clamp material and the electromagnet IO is
The guide plate 1 above the link members 12a and 12b
3 and a connecting member 14 as shown, and by moving the connecting member 14 along a guide protrusion 13a provided on the guide plate 13, the supporting member ll is lifted. It will be done.

(Problems to be Solved by the Invention) With the above configuration, when the disk cassette 15 is loaded into the device, the disk cassette 15 is moved to the clamp position by a loading mechanism (not shown), fixedly supported, and then moved to the support member ll. is lowered, and the optical disc 1 is clamped onto the turntable 3 by the clamp member 4.

At this time, the electromagnet 10 is supported with an angle of about 2 cm from the optical disk 1. This distance between the electromagnet 1O and the optical disk 1 is necessary to prevent the optical disk 1 from coming into contact with the electromagnet 10 due to warping or the like that occurs on the optical disk 1 when the optical disk 1 rotates.
It is desirable to lower the electromagnet 10 to a position as close as possible to the electromagnet 10. This is because the electromagnet 10 needs to change the direction of the current of the electromagnet between recording and erasing, and the switching time in this case is the same as the electromagnet 10. This is because reducing the number of turns of the coil reduces the length of the coil, but reducing the number of turns also weakens the strength of the magnetic field that can be applied. That is, by reducing the number of turns of the coil of the electromagnet 10 and bringing the electromagnet 10 as close to the optical disk 1 as possible, the strength of the magnetic field to be applied to the optical disk 1 is ensured, and the direction of the current in the electromagnet 10 is controlled. The switching time can be shortened.

However, the above conventional! In other words, the relative positional relationship of the electromagnet 10 with respect to the optical disk 1 depends on the movement stroke of the coupling member 14, the precision of parts such as the electromagnet IO1 support member 11, the link member 12, the guide plate 13, the coupling member 14, etc., or the assembly precision thereof. , or depending on various factors such as the height of the turntable 3. Therefore, even if the device is assembled with strict precision, the electromagnet 1
It is necessary to ensure a distance of at least 21 between 0 and the optical disk drive.

For this reason, in the conventional magneto-optical disk, the number of turns of the coil to be wound around the electromagnet 10 is several hundred in order to ensure the strength of the magnetic field to be applied to the optical disk l, and therefore, the number of turns of the coil to be wound around the electromagnet 10 is several hundred. It takes about 1oss of time,
In usage situations where recording or erasing is frequently repeated, there is a problem in that these processes require a lot of time.

Also, as mentioned above, the electromagnet 1 has a coil wound several hundred times.
In the case of 0, a large amount of current is required to be applied to this, and there is a limit to the reduction in power consumption.

(Means for Solving the Problems) The problem with the prior art as described above is that the magneto-optical recording of the present invention records, reproduces and erases information on a magneto-optical recording medium through cooperation between a light beam and a magnetic field. 11c21, a stopper is provided in a drive system unit provided with at least a drive means for driving the recording medium, and the stopper controls the positioning of the auxiliary magnetic field applying means for generating the magnetic field at least in a direction perpendicular to the recording medium. This is solved by Magneto-Optical Iso Co., Ltd., which is characterized by the following.

(for t'!-) With the configuration of the present invention described above, the light Iji of the auxiliary magnetic field applying means
For positioning with respect to the recording medium, the descending auxiliary magnetic field applying means is moved WJ, f! Since the above positioning is performed by locking the stopper attached to the II system unit, the above positioning is possible regardless of the various factors that influence the accuracy of the above positioning pointed out in the section of "Problems to be Solved by the Invention". Therefore, it is possible for the auxiliary magnetic field applying means and the magneto-optical recording medium to always maintain a constant tlH interval.

($ Flow Side) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

The first UA is a partial side view showing the main parts of the device according to the present embodiment.

The configuration of the device of this embodiment can be applied to various types of magneto-optical recording media such as card-shaped and disk-shaped ones, but in this embodiment, it can be applied to an optical disk as a magneto-optical recording medium. A simple device will be explained. Therefore,
The outline of the configuration of the apparatus of this embodiment is almost the same as that described in detail in the related art. The differences will be explained below.

At 1t, a protruding piece 11a is provided at the end of the support member 11 that supports the clamp member 4 and the electromagnet lO on the side of the electromagnet lO, and this protruding piece 11a holds the optical disk l in the magneto-optical recording device 2!16. A stopper 1 made of aluminum material, for example, is attached to the base 5.
6 is provided with a vibration isolating material 17 as a retaining circuit. The vibration isolating material 17 is made of, for example, hard vibration isolating rubber, and is fixed to the upper part of the stopper 16 by suitable means such as adhesive.

The vibration isolating material 17 is intended to prevent vibrations generated when the optical disc l is rotated from being transmitted to the electromagnet lO, but depending on the degree of vibration, it may be removed. If it is not necessary to attach the vibration material 17, it is necessary to extend the stopper 16 further upward, but in any case, the stopper 1
The height of 6 is such that when the support member descends and the protruding piece ILa is latched to the stopper 16, the clamp member 4 holds the optical disc l.
The base 5 is usually made of aluminum, so it can be finished with high precision, and the stopper 16 and vibration isolator 17 are By increasing the precision of the parts, the height-related positioning of the electromagnet IO with respect to the turntable 3 can be performed with high precision. With such a configuration.

When attaching the electromagnet 10 to the support member 11, the electromagnet l
This can be done by setting the distance between O and the optical disc l to about the maximum amount of surface play of the optical disc + 0.5 layer.

Therefore, when using an optical disk having a diameter of 130 mm, for example, the total distance between the electromagnet IO and the optical radar 6 below it can be within about 1-1.

In this way, the relative distance between the electromagnet as the electromagnetic force applying means and the optical disk as the magneto-optical recording medium in the device of this embodiment can be suppressed to at least half of that in the conventional device, and the relative distance between the electromagnet as the electromagnetic force applying means and the optical disk as the magneto-optical recording medium can be suppressed to at least half of that in the conventional device. The strength of the magnetic field is ensured with a considerably smaller number of coil turns than in conventional devices.

(Effects of the Invention) As explained above, according to the device of the present invention, the strength of the magnetic field to be applied to the magneto-optical recording medium can be ensured with a relatively smaller number of coil turns than in the conventional device. At the same time, reversal of the magnetization direction of the recording medium in a short period of time is referred to as rotation.

Further, as described above, since the amount of coil an to be wound around the electromagnet can be reduced, it is possible to downsize the auxiliary magnetic field applying device and the power supply device.

[Brief explanation of the drawing]

FIG. 1 is a partial side view showing the main parts of the individual packaging according to the present invention, FIG. 2 is a partial side view showing the main parts of the conventional device, and FIG. In Figure 2! It is an overall perspective view of the It position. l...Optical disk lO...-Electromagnet ii...
Support member 11a...Protruding piece 16--Stopper 17-...Vibration isolating material agent Patent attorney Minoru Yamashita
Children 1. Figure 2 Figure 5 ′j Pi

Claims (3)

[Claims] (1) In a magneto-optical recording device that records, reproduces, and erases information on a magneto-optical recording medium through cooperation between a light beam and a magnetic field, a stopper is provided in a drive system unit that is provided with at least a drive means for driving the recording medium. 2. A magneto-optical recording apparatus, characterized in that an auxiliary magnetic field applying means for generating the magnetic field is positioned at least in a direction perpendicular to the recording medium by the stopper. (2) The magneto-optical recording medium according to claim 1, characterized in that a vibration isolating material is provided between the stopper and the auxiliary magnetic field applying means. (3) The magneto-optical recording medium according to claim 1, wherein the recording medium is a disk-shaped recording medium, and the stopper is provided at only one location on the outside of the disk-shaped recording medium.