JPH11203742A - Magnetooptical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetooptical disk device capable of discharging static electricity electrified on an optical disk, protecting a control circuit and an audio circuit, etc., from the electric shock of discharge and preventing the adhesion of dust on the optical disk. SOLUTION: In a magnetooptical disk device having a magnetic head 10 by a over-write head method, a wire-like electrode line 16 made of carbon fiber and having good conductivity is supported by a clamper on the supporting arm 13 of the magnetic head 11, the rear end part of the electrode line 16 is made to be a grounded terminal 16b, the grounded terminal 16b is connected to a chasis 2 having the grounded potential, on the other hand, the tip part of the electrode line 16 is made to be a brush-like discharge terminal 16a, the discharge terminal 16a is arranged lower than the magnetic head 11 located on the leaped position and the discharge terminal 16a is brought into contact with the level surface of the optical disk prior to the magnetic head 11 at the time of recording operation.

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 capable of writing / reading an information signal, for example, a magnetic field modulation system such as an MD (mini disk).
The overwrite head type magnetic head is provided with a discharge electrode composed of conductive fiber electrode wires, and the discharge electrode is formed immediately before the magnetic head comes into contact with a magneto-optical disk (hereinafter referred to as an optical disk) to perform an information signal writing operation. By contacting the magneto-optical disk, static electricity or the like charged on the optical disk is discharged to the ground potential, and a control circuit, an electronic circuit, and the like are prevented from malfunctioning or being destroyed.

[0002]

2. Description of the Related Art Conventionally, in this type of magneto-optical disk drive of the magnetic field modulation type capable of writing and reading information signals, at the time of writing (recording) of information signals, the opposite side of the optical pickup device facing the objective lens is used. An overwrite head type magnetic head comes into contact with the label surface on the metal film side of the optical disk, and an information signal writing operation by magnetic field modulation is performed. Reading (reproduction) of information signals
In some cases, the magnetic head jumps up from the optical disk to be in a non-contact state, and an operation of reading an information signal by the optical pickup device is performed.

[0003]

By the way, it is known that an optical disk is charged with static electricity due to air friction or the like during rotation operation or rotation while a magnetic head is in contact with the magnetic head. In addition, it is known that an optical disc is charged with a human body even when touched by a user and generates static electricity. In particular, since a thin metal film is formed on the label surface of the optical disk with which the magnetic head contacts, the label surface is likely to be charged with static electricity.

Therefore, when a magnetic head comes into contact with the label surface of an optical disk in a recording operation in which an information signal is written, the magnetic head becomes a discharge path for static electricity charged on the label surface. That is, since the head arm holding the magnetic head is connected to the electronic circuit, the static electricity charged on the magnetic head is transmitted to the electronic circuit through the head arm. At this time, the electric shock due to the discharge affects the control circuit, the audio circuit, and the like, and appears as a malfunction of the signal processing system or noise in the audio signal. Moreover, when the magnitude of the discharge is large, there is a problem that the semiconductor circuit of the electronic circuit is destroyed.

Further, if static electricity is charged on the optical disk, dust and the like in the air adhere to the optical disk. Therefore, when the dust or the like adheres to the signal recording surface of the optical disk, a read error occurs in the operation of reading the information signal by the optical pickup. There is also a problem that arises.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to discharge static electricity charged on an optical disk to a ground potential and protect a control circuit, an audio circuit, and the like from an electric shock of the discharge. Can, and
It is an object of the present invention to provide a magneto-optical disk device that prevents dust and the like from adhering to an optical disk.

[0007]

In order to achieve the above-mentioned object, a magneto-optical disk drive according to the present invention comprises a support arm for holding a magnetic head of an overwrite head type, wherein a conductive discharge electrode is supported by a support arm. The ground terminal at the rear end of the electrode is connected to the ground potential, and the discharge terminal at the front end is brought into contact with the label surface of the optical disk during the recording operation.

[0008] With this configuration, in the recording operation, just before the magnetic head comes into contact with the label surface of the optical disk, the discharge terminal of the discharge electrode is brought into contact with the label surface. It can be discharged to the ground potential of the chassis or the like through the discharge electrode, and even if the magnetic head comes into contact with the discharged optical disk, the discharge operation with the magnetic head does not occur. Therefore, the control circuit, the audio circuit, and the like can be protected from electric shock due to discharge.

In addition, since the optical disc is not charged with static electricity, it is possible to prevent dust and the like from adhering and prevent an information signal reading error.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magneto-optical disk drive according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the entire appearance of a magneto-optical disk device of a magnetic field modulation system, FIG. 2 is a side view of the magneto-optical disk device having a disk cartridge mounted thereon, and FIG. 3 is a magneto-optical disk in a recording operation state of the optical disk. It is a top view of an apparatus.

The whole mechanism unit of the magneto-optical disc device is indicated by the reference numeral 1. An optical disk turntable 3 (not shown) is provided on a chassis 2 made of a metal material serving as a base frame of the mechanism unit 1. A disk cartridge 4 mounted in the direction indicated by an arrow in FIG. The optical disk 5 is rotatably held by holding a center plate (not shown) on the turntable 3. Further, the shutter 6 of the mounted disk cartridge 4 is opened, and the optical disk 5 is exposed from the shutter windows 4a and 4b on both the upper and lower sides.

An optical pickup device 8 having an objective lens 7 is arranged inside the chassis 2 so as to be movable along a guide shaft 9. That is, the objective lens 7 can be moved in the radial direction of the disc, facing the signal recording surface of the optical disc 5 through the shutter window 4b.

A magnetic head device 10 that moves in synchronization with the movement of the optical pickup device 8 is disposed above the disk cartridge 4. Magnetic head device 10
Is a suspension 12 having a magnetic head 11 at the tip.
And a support arm 13 for supporting the suspension 12
Constitute a so-called overwrite head type magnetic head device, which is rotatable in the vertical direction by a bearing portion 14.

That is, when writing an information signal on an optical disk, the magnetic head device 10 moves downward, and the magnetic head 11 is moved to the disk window 4 above the disk cartridge 4.
The magnetic field is modulated by the interaction with the laser light emitted from the objective lens 7 of the optical pickup device 8 to the optical disk 5 from the contact surface a to contact the label surface of the optical disk 5, and the information signal is written. When reading the information signal, the magnetic head device 10 holds the upward movement position, reads the magnetized polarity of the optical disk 5 by the laser beam, and reads the information signal.

The control circuit and the audio circuit of the optical pickup device 8 and the magnetic head device 10 are the same as those of the chassis 2.
The ground potential of these control circuits and audio circuits is conducted to the chassis 2.

In the present invention, the magnetic head device 10 is used as means for discharging static electricity charged on the optical disk.

In this embodiment, the support arm 13 of the magnetic head device 10 is located on the inner diameter side of the optical disk 5 with respect to the suspension 12 having the magnetic head 11 as shown in FIG. A high-conductivity discharge electrode made of, for example, carbon fiber is attached to the discharge electrode.
In this embodiment, the discharge electrode is, for example, a flexible wire-shaped electrode wire 16.

As a method of attaching the electrode wires 16 to the support arm 13, a C-shaped clamper 17 is provided on the outer surface of the support arm 13 as shown in FIG. How to Clamper 1
7 is at least two of the front end side and the rear end side of the support arm 13.
The electrode wires 16 can be stably held by providing them at the locations.

The distal end of the electrode wire 16 held by the clamper 17 becomes a discharge terminal 16a. The discharge terminal 16a reaches the magnetic head device 10 which is jumping upward and hangs downward from the magnetic head 11. ing. The discharge terminal 16a is formed in a brush shape.

On the other hand, behind the electrode wire 16 is a support arm 13.
The rear end is a ground terminal 16b and is fixed to the chassis 2 at the ground potential by soldering or the like.

In the magneto-optical disk device configured as described above, when the magnetic head device 10 moves downward in the operation of writing an information signal to the optical disk 5, the magnetic head 11 moves to the label surface of the optical disk 5. Immediately before the contact, the discharge terminal 16a at the tip of the electrode wire 16 contacts the label surface of the optical disk 5. The static electricity charged on the optical disk 5 by the contact operation of the discharge terminal 16a is discharged to the discharge terminal 1
6a, the electrode wire 16 can be transmitted from the ground terminal 16a to the chassis 2 which is at the ground potential.
The optical disk 5 is in a state where static electricity is not charged. Therefore, when the magnetic head 11 contacts the label surface of the optical disk 5 after the contact of the electrode wire 16, the magnetic head device 10
Since a discharge phenomenon does not occur, electric shock due to discharge to a control circuit, an audio circuit, or the like can be avoided, and malfunctions or breakage of these circuits can be prevented.

Also, during the operation of writing the information signal to the optical disk 5, the discharge terminal 16a is always in contact with the label surface of the optical disk, so that the static electricity charged on the optical disk 5 is discharged from the discharge terminal 16a and discharged to the ground terminal 16b.
More escape to the chassis 2 is possible. At this time, since the charged static electricity is extremely small, even if a part of the static electricity is discharged from the magnetic head 11, no malfunction is caused to the control circuit, the audio circuit and the like.

Further, since the optical disk 5 is not charged with static electricity, dust in the air can be prevented from adhering to the signal recording surface of the optical disk 5, whereby a signal reading error by the optical pickup device 8 can be prevented. Can be eliminated.

Further, by forming the discharge terminal 16a of the electrode wire 16 in a brush shape, the contact state with the label surface of the optical disk 5 can be performed well, and thereby, the static electricity charged on the optical disk 5 can be improved. Can be reliably discharged to the discharge terminal 16a.

Further, the electrode wire 16 is connected to the magnetic head device 10.
The discharge terminals 16a of the electrode wires 16 do not separate from the optical disk 5 even when the magnetic head 11 reaches the outermost periphery of the optical disk 5 in the information signal writing operation. Can be held.

After completion of the information signal writing operation,
As the magnetic head device 10 jumps up, the electrode wire 1
6 is connected to the magnetic head 1 as shown in FIG.
It returns to the position where it hangs below 1 again.

The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

In the present embodiment, the case where the wire 16 is used as the electrode wire 16 has been described, but it is also possible to use an electrode wire formed in a flat wire shape. Even in this case, the discharge terminal portion at the tip is formed in a brush shape.

Although a flexible carbon fiber is sufficient as a material for the electrode wire 16, since the discharge terminal 16a rubs against the label surface of the optical disc, it is necessary to use a carbon fiber electrode wire made of a reinforcing fiber. This is preferable because no friction powder is generated between the optical disk and the optical disk.

As a method of fixing the electrode wire 16 to the support arm 13, except for using the clamper 17 as described above, the fixing means is not particularly limited.

Further, the electrode wire 16 according to the present invention can be widely applied to a magneto-optical disk device of an overwrite head system, for example, a light source such as a deck type mini disk (MD) and a portable type mini disk (MD). It is very suitable for application to a magnetic disk drive.

[0033]

As described above, the magneto-optical disk drive of the present invention supports a conductive discharge electrode on a head arm holding an overwrite head type magnetic head,
The ground terminal of the discharge electrode is connected to the ground potential, and the discharge terminal on the tip side contacts and separates from the label surface of the optical disk according to the vertical movement of the magnetic head, so that the optical disk is charged during the recording operation. The static electricity can be transmitted to the discharge electrode and effectively discharged to the ground potential, thereby protecting the control circuit and audio circuit constituting the circuit system of the magneto-optical disk drive from the electric shock caused by the discharge. Can be prevented from malfunctioning or destroying, and a highly reliable magneto-optical disk device can be obtained.

In addition, since the electrostatic charge on the optical disk due to the contact of the magnetic head during the recording operation can be suppressed, it is possible to prevent dust or the like from adhering to the optical disk beforehand and to avoid an information signal reading error. it can.

According to a second aspect of the present invention, the discharge electrode discharges static electricity charged on the optical disk by causing the discharge terminal to contact the label surface before the magnetic head contacts the label surface of the magneto-optical disk. Since it can be reliably discharged to the ground potential through the electrodes, it is possible to prevent static electricity from leaking to the magnetic head side.

According to the third aspect of the present invention, the discharge electrode is formed of an electrode wire made of a conductive fiber such as carbon fiber which is flexible, so that the static electricity charged on the optical disk is instantaneously guided to the electrode wire. Can be done.

According to the fourth aspect of the present invention, the discharge terminals of the discharge electrodes are formed in a brush shape, so that the contact state with the label surface of the optical disk can be satisfactorily performed, and the static electricity charged on the optical disk is discharged. The terminal can be reliably discharged.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magneto-optical disk device provided with a discharge electrode according to the present invention.

FIG. 2 is a side view of a magneto-optical disk device in which a magneto-optical disk is mounted and a magnetic head is flipped up.

FIG. 3 is a plan view of the magneto-optical disk device during an information signal recording operation.

FIG. 4 is a perspective view of a discharge electrode holding structure.

[Explanation of symbols]

2 chassis, 3 turntable, 4 disk cartridge, 5 optical disk, 8 optical pickup device,
Reference Signs List 10 magnetic head device, 11 magnetic head, 13 support arm, 15 circuit board, 16 electrode wire, 16a discharge terminal, 16b ground terminal

Claims (4)

[Claims] 1. A magneto-optical disc device comprising: an optical pickup device for writing / reading an information signal on / from a signal recording surface side of an optical disc; and an overwrite head type magnetic head for performing magnetic field modulation from a label side of the optical disc. A support arm for holding the magnetic head, comprising a conductive discharge electrode, wherein the discharge electrode is connected to a ground potential of a disk device, and a discharge terminal that contacts a label surface of the optical disk at the start of a recording operation. A magneto-optical disk device comprising: 2. The magneto-optical disk drive according to claim 1, wherein the discharge electrode is arranged so that the discharge terminal contacts the label surface immediately before the magnetic head contacts the label surface of the optical disk. A magneto-optical disk device characterized by the following. 3. The magneto-optical disk device according to claim 1, wherein said discharge electrode is an electrode wire having flexibility and made of conductive fiber such as carbon fiber. 4. The magneto-optical disk device according to claim 1, wherein said discharge terminal is formed in a brush shape.