JP3036662B2 - Magneto-optical disk drive - Google Patents

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 drive which can be used for a magneto-optical disk and a ROM disk which can be overwritten by magnetic field modulation.

[0002]

2. Description of the Related Art In a magneto-optical disk device for performing magneto-optical recording by a magnetic field modulation method, it is necessary to bring a magnetic head as close as possible to a recording medium film of a magneto-optical disk due to a relationship between a modulation frequency and a generated magnetic field. This is the same as the necessity of reducing the gap when defining the modulation frequency in the conventional induction type magnetic recording system. Therefore, as already known, a floating magnetic head utilizing the dynamic pressure effect of air generated by the rotation of a disk is the simplest in structure,
In addition, the minimum gap can be kept stable.

However, even with the same magneto-optical disk,
A ROM (using a change in the reflectance of embossed pits) disk or a light modulation type (using a modulation of the intensity of laser light) magneto-optical disk takes into account surface smoothness suitable for a floating magnetic head. When information is recorded on the magneto-optical disk using a floating magnetic head, the recording medium film of the disk or the magnetic head itself is damaged when the magnetic head is loaded. There is a possibility that.

Therefore, in the case of recording on a non-magnetic field modulation type disk, it is necessary to retract the floating magnetic head, and the above-mentioned general-purpose magneto-optical disk device is provided with a magnetic head retracting mechanism for this purpose. Also, for floating magnetic heads,
When performing magnetic field modulation is fast, in order to suppress the impedance low, it is necessary to reduce the size of the magnetic pole, for example, even when the carrier frequency of about 5～8MH _Z, about the cross-sectional area of the magnetic pole 0.04mm ^It needs to be about ² .

For this reason, in the conventional magneto-optical disk apparatus, as shown in FIG. 4, when the position of the magnetic head 101 mounted on the holder 103 is adjusted with respect to the optical axis 120 of the objective lens, the radial direction of the disk ( With respect to the arrow B), the holder 103 is adjusted in position with respect to the rotating member 102 which is a part of a mechanism for loading / unloading the disk and the disk cartridge, and is then fixed. In the direction (arrow A) perpendicular to the track direction, the rotation support shaft 115 on which the rotation member 102 is fixed via a ball bearing (not shown) is slid with respect to the carriage 104. After adjusting the position, it is fixed.

In the light modulation, it is difficult to use a floating magnetic head for the above-described reason. Therefore, it is necessary to separately provide a magnetic field applying device such as an electromagnet. For this reason, as shown in FIG.
After adjusting the position with respect to the optical pickup above,
A structure in which an electromagnet including 50a / b and a coil 151 is mounted is adopted.

[0007]

However, the above-described magneto-optical disk drive (shown in FIG. 4 or FIG. 5) has the following drawbacks. That is, in the above-described magneto-optical disk device, since the support portion of the retracting mechanism of the magnetic head 101 is formed directly on the carriage 104, the position adjusting mechanism needs to be installed on the movable portion of the magnetic head retracting mechanism. After the position of the magnetic head 101 is adjusted with high precision, the magnetic pole 150 of the electromagnet is attached to the rotation support shaft 115 via the electromagnet holder 152 so that the magnetic head 101 is orthogonal to the radial direction of the disk. There is a high possibility that the direction adjustment position shifts during the work process.
In addition, the position adjustment of the magnetic head is performed while recording and reproducing magnetic field modulation with the disk loaded, and checking while confirming. At this stage, it is necessary to assemble the optical system of the drive mechanism and sensors. Adjustment must be completed. For this reason, it is necessary to mount a magnetic head on the carriage 104 mounted on a chassis (not shown), adjust a magnetic pole position, mount an electromagnet, and adjust the position of the magnetic pole. Parts and jigs are necessary, assembling workability is poor, and there are problems in reliability and cost.

[0008]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and has a structure in which a holding portion of a mechanism for loading / unloading a floating magnetic head with respect to a disk and a disk cartridge is independent of a carriage of an optical pickup device. Accordingly, it is an object of the present invention to provide a magneto-optical disk drive capable of improving workability of assembling and position adjustment, improving reliability, and reducing costs.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a disk having a magneto-optical recording medium film and a protective film formed on a transparent plate, and an optical pickup device and a magnetic field on both sides thereof. In a magneto-optical disk drive in which a modulation magnetic head is associated and a laser beam is applied to the magneto-optical recording medium film to write a magneto-optical signal, the magnetic head is generated by relative movement with the disk. A floating magnetic head configured to levitate by airflow, wherein a mechanism for loading / unloading the magnetic head with respect to the disk and its disk cassette is held by a holding member, and the holding member is The optical pickup device is mounted on a carriage of the optical pickup device so as to be adjustable in front-rear and left-right positions. It is configured to thread move with.

[0010]

Accordingly, the magnetic head (or the unit of the magnetic head and the electromagnet) is mounted on the holding member in advance, and the holding member is mounted on the carriage, so that the assembling and position adjustment can be performed simultaneously. . At this time, the adjustment to the carriage is only required to be performed by adjusting the absolute position of the magnetic head.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. Here, a main part of a magneto-optical disk device including a movable optical unit according to the present invention is shown. Here, the seek motor 9 composed of the magnetic circuit 8 and the coil 7 simultaneously seeks the optical pickup 6 and the floating magnetic head 1 mounted on the carriage 4 of the optical pickup device along the guide rail 10. It has become.

A loading / unloading mechanism for the magnetic head with respect to the magneto-optical disk and the disk cassette is mounted on the holding member 3 of the magnetic head 1, and its structure is a rotating shaft orthogonal to the radial direction of the disk. The rotary member 2 for holding the magnetic head 1 is pivotally supported at a bearing portion formed on the holding member 3 via a shaft 15. The magnetic head 1 is guided in the direction of loading / unloading with respect to the disk surface by rotating the rotating member 2 about the rotating shaft 15. , Toward the carriage 4 side. The loading / unloading operation on the disk cassette is synchronized with the lifting / lowering operation of the disk cassette mounting member which is a part of the disk cassette mounting / removing mechanism. You may make it perform by making a mounting member engage. Alternatively, the operation may be performed independently by engaging an operating element of the plunger with the rotating member 2 using an electrically controlled driving mechanism such as a solenoid plunger.

FIG. 2 shows a case where only the floating magnetic head according to the present invention is mounted on a carriage, in a partially disassembled state. The floating magnetic head 1 has a holding member 3
The holding member 3 is fixed to a tap hole 4 a provided on the carriage 4 by screwing a screw 5 through the hole 3 a of the holding member 3. By setting the size of the hole 3a larger than the diameter of the screw 5 so as to have a margin, when the holding member 3 is fixed on the carriage 4, the position can be adjusted in the front-rear and left-right directions. As a result, the relative position between the magnetic pole of the magnetic head 1 provided on the holding member and the optical axis of the objective lens on the carriage 4 (that is, the optical pickup) can be adjusted.

FIG. 3 shows a case in which a floating magnetic head and an electromagnet 50 (a magnetic field applying device used for a light modulation type disk) are simultaneously mounted on the carriage 4 in the present invention. In the electromagnet 50 of the present embodiment, the magnetic field application unit at the tip is disposed close to the side of the magnetic head 1,
In addition, the holding member 3 is rotated by a rotating member 52 that can be rotated about the support shaft 15 so that the magnetic pole 50 a around which the coil 51 is wound can rotate about the support shaft 15. The configuration is retained. Here, similarly, the magnetic pole 50b attached to the holding member 3 is the same as the magnetic pole 50a.
At the time of lowering (see FIG. 3), one end is brought into contact with the magnetic pole 50a to form a substantially ring-shaped magnetic path, thereby improving magnetic efficiency. The magnetic pole 50a is adjusted in position with respect to the magnetic head 1 in the unit state, and is fixed to the rotating member 52.
As in the case of (1), the assembly can be completed only by adjusting the magnetic head.

In the above embodiment, the holding member 3
Is fixed to the carriage 4 in the same manner as in the embodiment shown in FIG.
Then, the screw 5 is screwed through the hole 3a of the holding member 3. It should be noted that, instead of using the structure of direct fastening by the screw 5, the following means may be used. That is, by using an elastic member having a fixed end provided on the carriage 4, the holding member 3 is pressed and urged against the carriage 4 to perform position adjustment and fixing, or the supporting member 3 is attached to the carriage 4 with high viscosity. If the carriage 4 and the holding member are both made of synthetic resin,
It is welded using heat or ultrasonic waves, or fitted and fixed using elastic deformation of the material. Further, in the present embodiment, the rotating mechanism of the magnetic head 1 is not limited to the case using the rotating shaft 15, and the holding member 3 is used as a fixed end, and the leaf spring is used instead of the rotating member 2. Is also good. Also, the mounting structure of the electromagnet need not be limited to only the case where the rotating shaft 15 is shared with the magnetic head 1.

[0016]

According to the present invention, as described above, an optical pickup device and a magnetic head for modulating a magnetic field are supported on both sides of a disk having a magneto-optical recording medium film and a protective film formed on a transparent plate. Then, in the magneto-optical disk device configured to irradiate the magneto-optical recording medium film with a laser beam and write a magneto-optical signal, the magnetic head floats with an air flow generated by relative motion with the disk. And a mechanism for loading / unloading the magnetic head from / to the disk and its disk cassette is held by a holding member, and the holding member is a carriage of the optical pickup device. The sled moves together with the optical pickup device in the radial direction of the disc in order to adjust the front-rear and left-right positions. Since the configuration so that, not only the magnetic modulation type, the optical modulation type magneto-optical disc or RO
It is possible to provide a highly reliable and low-cost magneto-optical disk device which enables the use of the M disk, and which can be easily assembled and adjusted in position.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of FIG.

FIG. 3 is a partially exploded perspective view of another embodiment.

FIG. 4 is a perspective view of a conventional example.

FIG. 5 is a perspective view of another conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 floating magnetic disk 2 holding member 3 rotating member 4 carriage 5 screw 6 optical pickup 7 linear motor coil 8 magnetic circuit 10 guide rail 15 rotating shaft 50 electromagnet 50a magnetic pole 50b magnetic pole 51 coil

Claims (3)

(57) [Claims] An optical pickup device and a magnetic head for modulating a magnetic field are provided on both sides of a disk having a magneto-optical recording medium film and a protective film formed on a transparent plate, and a laser is applied to the magneto-optical recording medium film. In a magneto-optical disk device configured to irradiate light and write a magneto-optical signal, the magnetic head is a floating magnetic head configured to fly with an airflow generated by relative movement with the disk, A mechanism for loading / unloading the magnetic head with respect to the disk and its disk cassette is held by a holding member, and the holding member is capable of adjusting the front / rear and left / right positions with respect to the carriage of the optical pickup device. , And configured to move in a sled with the optical pickup device in a radial direction of the disk. Magneto-optical disk drive. 2. The magneto-optical disk device according to claim 1, wherein a magnetic field applying device for optical modulation recording is mounted on the holding member. 3. The magneto-optical disk drive according to claim 1, wherein the holding member is configured to be mounted on the carriage by at least a plurality of screw means.