JPH04358341A - Magneto-optical recording device - Google Patents

Abstract

PURPOSE:To always keep the fixed distance of a magnetic head faced to a magneto-optical disk with simple structure. CONSTITUTION:At the magneto-optical recording device to record information signals to a magneto-optical disk 1 by an optical pickup device 6 and a magnetic head device 11, rollers 16 and 17 are provided at the both end parts of support shafts 14 and 15 so as to contact signal non-recording parts on the outer and inner peripheral sides of the magneto-optical disk 1 and further, the magnetic head device 11 is fitted to these support shafts 14 and 15 movably in a track direction so as to be a non-contact state to the magneto-optical disk 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording device for recording information signals on a magneto-optical disk, and more particularly to a mounting structure for a magnetic head device.

0002

2. Description of the Related Art When writing information signals onto a magneto-optical disk, it is necessary to always maintain a constant distance between the magnetic head and the magneto-optical disk so that the intensity of the applied magnetic field does not change due to surface runout or the like. For example, until now, light-emitting diodes (
The so-called active servo system uses a distance sensor such as an LED (LED) type or a capacitance type and an actuator such as a VC type to keep the magnetic head at a constant distance from the magneto-optical disk, or a hard disk drive device. An air floating method in which a magnetic head is floated by an air flow with respect to a magneto-optical disk, and a head contact sliding method in which a magnetic head is brought into direct contact with a magneto-optical disk are being considered.

However, while the active servo system can reliably maintain a constant distance between the magnetic head and the magneto-optical disk, it requires a distance sensor and an actuator, resulting in a complicated structure and high cost. I can't do it. On the other hand, with the air floating method, there is no problem when the magneto-optical disk is rotating at high speed, but at low speeds the flying height of the magnetic head is not constant and the facing distance between the magnetic head and the magneto-optical disk tends to fluctuate. . Furthermore, in the head contact sliding contact method, since the magnetic head is brought into sliding contact with the magneto-optical disk, the head is likely to wear out and there is a problem in durability in terms of head life.

0004

[Problems to be Solved by the Invention] The present invention has been proposed in view of the above-mentioned conventional situation, and has a simple structure that provides reliability in maintaining a constant facing distance of a magnetic head with respect to a magneto-optical disk. The purpose is to provide an excellent magneto-optical recording device.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the magneto-optical recording device of the present invention includes an optical pickup device disposed opposite to a signal recording surface of a magneto-optical disk rotationally driven by a spindle motor. and a magnetic head device disposed opposite to an optical pickup device with the magneto-optical disk in between, the magnetic head device being in contact with signal non-recording portions on the outer and inner circumference sides of the magneto-optical disk. It is characterized in that it is movably inserted into a support shaft whose both ends are supported by a pair of contact support parts, and is supported in a non-contact state with respect to the magneto-optical disk.

[0006]

[Operation] In the magneto-optical recording device according to the present invention, the magnetic head device disposed opposite to the optical pickup device is provided with a pair of contact supports that make contact with the signal non-recording portions on the outer and inner circumferential sides of the magneto-optical disk. Since it is movably inserted into the support shaft whose both ends are supported by the magneto-optical disk and is supported in a non-contact state with respect to the magneto-optical disk, even if the magneto-optical disk experiences surface runout, the contact support section This surface runout is followed to keep the facing distance of the magnetic head device relative to the magneto-optical disk constant.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described below with reference to the drawings. As shown in FIG. 1, the magneto-optical recording device of this embodiment has an outer casing 2 that houses therein an optical pickup device, a magnetic head device, etc. for writing information signals onto a magneto-optical disk 1. It is composed of

The outer casing 2 is formed as a rectangular casing large enough to accommodate a spindle motor, an optical pickup device, etc., and includes a device main body 3 having an opening with an open upper side; 3 and a lid 4 for closing the opening. The lid body 4 is rotatably supported in the direction of arrow A in FIG. 1 via a hinge portion (not shown) provided at one side edge of the device body 3, The opening of the main body 3 can be opened and closed.

[0009] Inside the apparatus body 3, there is provided a so-called floating chassis (not shown) supported by a spring from the bottom, and a spindle motor 5 and an optical pickup device 6 are disposed on this chassis. There is. The spindle motor 5 has a spindle shaft 5a, and rotates by chucking the magneto-optical disk 1 onto a disc-shaped disk table (not shown) provided at the tip of the spindle shaft 5a. There is.

The optical pickup device 6 is formed of, for example, aluminum die-casting, and has an optical block portion 6a containing various optical devices and the like. This optical pickup device 6 condenses and irradiates a light beam emitted from a light source such as a semiconductor laser or the like built into the optical block section 6a, that is, incident light, onto the magneto-optical disk 1 through an objective lens 6b. The light beam reflected from the magneto-optical disk 1, that is, the return light, is configured to be detected by a photodetector built in the optical block section 6a. The optical block section 6a has a built-in detection optical system for guiding the return light reflected by the magneto-optical disk 1 to the photodetector. This detection optical system includes, for example, a Wollaston prism, a condensing lens, etc., and is configured so that the polarization direction of the light beam can be detected by the photodetector.

The optical pickup device 6 also engages with a pair of mutually parallel support rails 9, 10 attached to a pair of fixing blocks 7, 8 fixed on the chassis. It is made movable along 10. The support rails 9 and 10 are spaced apart from each other by a predetermined distance so that the rails are parallel to fixed blocks 7 and 8 that are respectively fixed to one side wall in the longitudinal direction of the device main body 3 and a position close to the spindle motor 5. These rails are provided parallel to the magneto-optical disk 1. Therefore, in the optical pickup device 6, the objective lens 6b is disposed facing the signal recording surface of the magneto-optical disk 1, and is movable in the radial direction (track direction) across the inner and outer peripheries of the magneto-optical disk 1. There is.

On the other hand, a head support member 12 is provided on the inner surface of the lid 4 to support a magnetic head device 11 that sandwiches the magneto-optical disk 1 and faces the objective lens 6b. The head support member 12 is formed as a rectangular plate, and support shaft attachment portions 12a, 12 are provided at both ends of the head support member 12 so as to hang down toward the magneto-optical disk 1, respectively.
It has b. The head support member 12 is supported by a compression spring 13 attached to the inner surface of the lid 4, and is always urged toward the magneto-optical disk 1 by the elastic force of the compression spring 13. There is.

As shown in FIG. 2, the head support member 12 includes a pair of support shafts 14 and 15 that enable the magnetic head device 11 to move in the track direction with respect to the magneto-optical disk 1 without contacting it. It is provided. These support shafts 14 and 15 are spaced apart from each other by a predetermined distance in the height direction so that they are parallel to the signal recording surface of the magneto-optical disk 1, and the shafts are parallel to each other. 12b with each end fixedly attached. Of these support shafts 14 and 15, the support shaft 15 on the magneto-optical disk 1 side has a pair of rollers 16 and 17 that serve as contact support parts that contact the signal non-recording portions on the outer and inner circumference sides of the magneto-optical disk 1. is rotatably mounted. That is, these rollers 16,
17 are provided in contact with positions corresponding to the signal non-recording portions on the outer and inner circumferential sides of the magneto-optical disk 1 excluding the recording area 1a, and rotate with the rotation of the magneto-optical disk 1. ing.

It is desirable to use a relatively soft material for the rollers 16 and 17 so as not to damage the magneto-optical disk 1 by contact. Suitable materials include, for example, rubber, resin, or a metal roller whose surface is coated with rubber, resin, or the like. When using a resin roller, for example, polytetrafluoroethylene (registered trademark Teflon), polyacetal (registered trademark
It is desirable to use a resin such as Delrin) or polyamide (registered trademark nylon).

[0015] Then, the pair of support shafts 14,1
A magnetic head device 11 for applying a magnetic field to the recording area 1a of the magneto-optical disk 1 is movably attached to the magneto-optical disk 5. That is, the magnetic head device 11 includes a head housing member 19 that houses the main pole 18 around which the coil is wound.
By inserting and engaging the respective support shafts 14 and 15 into the engagement holes drilled in the head housing member 19, the head is supported by the support shafts 14 and 15 and is attached to the support shafts 14 and 15. It is movable in the direction of arrow B in FIG. At this time, the tip of the main pole 18 faces the magneto-optical disk 1 with a small gap therebetween.

The magnetic head device 11 and the optical pickup device 6 are movable in conjunction with each other over the inner and outer peripheries of the magneto-optical disk 1 so that the objective lens 6b and the main magnetic pole 18 always face each other. being done. That is, the optical pickup device 6 and the magnetic head device 11
are connected by a connecting arm consisting of a first support arm 20 and a second support arm 21 so that they move in conjunction with each other. The first support arm 20 is made of a metal plate with a substantially L-shaped side surface, the base end is fixed to the optical block 6a, and the distal end is connected to the hinge between the lid 4 and the device main body 3. It is designed to be located nearby. On the other hand, the second support arm 21 has a distal end fixed to the head support member 19 and a proximal end engaged with a joint 22 provided at the distal end of the first support arm 20 to rotate. installed as possible. In other words,
The second support arm 21 rotates about the joint 22 in the direction of arrow C in FIG. 3 as the lid 4 opens and closes.

In the magneto-optical recording device configured as described above, when the lid 4 is closed on the device main body 3, the support shaft 14 of the head support member 12 supported on the inner surface of the lid 4 A pair of rollers 16, 17 provided on , 15
comes into contact with the signal non-recording portion of the magneto-optical disk 1. At this time, the rollers 16 and 17 are connected to the head support member 12.
is resiliently biased toward the magneto-optical disk 1 by a compression spring 13 stretched across the inner surface of the lid 4, so that it comes into contact with the magneto-optical disk 1 with a predetermined pressing force. Become. At the same time, the main pole 18 of the magnetic head device 11 is provided to sandwich the magneto-optical disk 1 and face the objective lens 6b of the optical pickup device 6.

When the apparatus is set to the recording mode in this state, the magneto-optical disk 1 placed on the disk table rotates, and the rollers 16 and 17 in contact with the magneto-optical disk 1 rotate accordingly. do. Then, the optical pickup device 6 is operated to move between the inner and outer circumferences of the magneto-optical disk 1, and in conjunction with this, the magnetic head device 11 is similarly moved to output information signals to the magneto-optical disk 1. will be recorded. At this time, the magneto-optical disk 1
Even if the support shafts 14 and 15 cause surface runout,
Rollers 16 and 17 provided at both ends follow this surface deflection, and keep the facing distance between the main pole 18 of the magnetic head device 11 and the magneto-optical disk 1 constant at all times. Even if the surface runout is large, the head support member 12 is urged toward the magneto-optical disk 1 by the compression spring 13, so that the rollers 16, 17 do not separate from the magneto-optical disk 1 and reliably follow it. Therefore, according to the magneto-optical recording apparatus of this embodiment, a magnetic field of constant strength can always be applied to the magneto-optical disk 1, and the recording state can be made stable. Furthermore, since the rollers 16 and 17 contact the non-signal recording area other than the recording area 1a of the magneto-optical disk 1, they do not cause any trouble during recording and do not damage the recording area 1a. Nor.

Although one embodiment of the magneto-optical recording device to which the present invention is applied has been described above, the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention. It is possible. For example, the rollers 16 and 17 used in the previous embodiment are fixed to the support shafts 14 and 15 so as not to rotate, and the rollers 16 and 17 are fixed to the magneto-optical disk 1.
The same effect can be obtained even if the signal non-recording portion is brought into contact and slid. In this case, it is desirable that the rollers 16 and 17 be made of a material that has excellent abrasion resistance, especially considering durability, and that does not easily scratch the magneto-optical disk 1.

[0020]

As is clear from the above description, in the magneto-optical recording device according to the present invention, the support shaft is provided with a contact support portion that contacts the signal non-recording portions on the outer and inner circumferential sides of the magneto-optical disk. Therefore, even if the magneto-optical disk experiences surface wobbling, the contact support section will follow the surface wobbling, and the magnetic head device will always remain in a constant non-contact state with the magneto-optical disk, regardless of whether it is running at low or high speeds. Keep at a distance of Therefore, according to the magneto-optical recording device according to the present invention,
The strength of the magnetic field applied to the magneto-optical disk can be made constant over the entire recording area, and the recording state can be made stable.

As described above, the magneto-optical recording device according to the present invention can perform control comparable to an active servo system with a simple structure without using a distance sensor or an actuator, so that the device can be provided at a low cost, and Maintenance can also be greatly simplified.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an example of a magneto-optical recording device to which the present invention is applied.

FIG. 2 is a schematic front view showing an enlarged main part of a magneto-optical recording device to which the present invention is applied.

FIG. 3 is a schematic side view showing an enlarged main part of a magneto-optical recording device to which the present invention is applied.

[Explanation of symbols]

1... Magneto-optical disk 3...Device body 4... Lid body 5...Spindle motor 6...Optical pickup device 6b...Objective lens 11...Magnetic head device 12...Head support member 16,17...roller 18...Main magnetic pole

Claims (1)

[Claims] 1. An optical pickup device disposed facing a signal recording surface of a magneto-optical disk rotationally driven by a spindle motor, and a magnetic head device disposed facing the optical pickup device with the magneto-optical disk sandwiched therebetween. The magnetic head device is movably inserted into a support shaft supported at both ends by a pair of contact support portions that contact the signal non-recording portions on the outer and inner circumference sides of the magneto-optical disk. A magneto-optical recording device characterized by being supported in a non-contact state with respect to a magnetic disk.