JPH05282733A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To miniaturize and simplify the device by constituting a retracting mechanism so as to hold a magnetic head in a loading position or an unloading position as selected at the loaded stage of a magneto-optical recording medium into a deck. CONSTITUTION:A turning member 9 is formed integrally with a cam body having engagement surfaces 9a and 9b opposite to an elastic holding surface of an energizing means 13. Then, when the engagement surface 9a is in contact with the elastic holding surface, the turning member 9 is elastically held under an inclined state by the energizing means 13, so as to hold a slider 11 in a position close to a disk surface of the magneto-optical recording medium 2 loaded onto a spindle motor 1. Then, when the engagement surface 9b is in contact with the elastic holding surface, the turning member 9 is elastically held under the opposite inclined state by the energizing means 13, so as to hold the slider 11 in a separated position (retracted position) from the disk surface of the magneto-optical recording medium.

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 capable of erasing and rewriting information on a disk-shaped magneto-optical recording medium, and more particularly to a magnetic field modulation type overwritable magneto-optical recording medium. The present invention relates to a magneto-optical disk device equipped with a magnetic field modulation type magnetic head that is loaded at a predetermined interval by the action of a flying slider.

[0002]

2. Description of the Related Art When performing magneto-optical recording by a magnetic field modulation method, it is necessary to bring a magnetic head close to a disk surface (recording film) of a magneto-optical recording medium because of the relationship between the modulation frequency and the generated magnetic field. There is no difference from the case of the disk device in the induction type magnetic recording system. Therefore, it is the simplest and most effective to employ a flying slider that utilizes the dynamic pressure effect of air generated by the rotation of the disk for the magnetic head in this magnetic field modulation method. In this case, the slider is urged toward the disk surface by using an urging means such as a bias spring, and when the magneto-optical recording medium is rotationally driven, the slider moves between the disk surface and the slider. By balancing the dynamic pressure of the air generated with the sliding surface, the required clearance can be maintained. Therefore, until the magneto-optical recording medium is rotationally driven for recording / reproduction, it is necessary to move the magnetic head together with the slider away from the disk surface by a proper driving means to retract the magnetic head to the unload position. A retracting mechanism for this purpose is prepared.

[0003]

However, in the case where an optical modulation type (laser light intensity modulation) magneto-optical recording medium or a ROM (embossed pit reflectance change) disk is erroneously loaded in the magneto-optical disk device. Does not take measures such as providing a smooth surface necessary for flying on the disk surface of the magneto-optical recording medium as in the case of using the above-mentioned flying slider, so that the disk surface of the magneto-optical recording medium is When the magnetic head is at the same load position, a stable flying state cannot be obtained, and the above-mentioned problems such as damage due to contact occur. Therefore, when a magneto-optical recording medium such as a light modulation type is mistakenly loaded, it is necessary to retract the magnetic modulation magnetic head and the floating slider to the unload position until the medium is ejected. is there. Further, when the magneto-optical disk device is also used for reproducing at least a magneto-optical recording medium such as an optical modulation type, it is necessary to retract the magnetic head to an unload position.

Therefore, the retracting mechanism is controlled on the basis of information from an appropriate detecting means, and functions to hold the magnetic head and the flying slider at the loading position or the unloading position. In this case, the retracting mechanism includes a guide member, and the guide member presses the base end side of the support body that supports the floating slider via the suspender. For this reason, since it is necessary to engage the guide member with the support within the seek operation range of the magnetic head, the guide member is extended in the radial direction of the magneto-optical recording medium. There is a drawback.

[0005]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and holds the magnetic head at the loading or unloading position when the magneto-optical recording medium is loaded onto the deck. Thus, an attempt is made to provide a magneto-optical disk device in which the retracting mechanism is configured so that the magnetic head can maintain its state at the stage of the seek operation so that the retracting mechanism can be downsized and simplified. Is.

[0006]

Therefore, according to the present invention,
At least the magnetic head that irradiates the disc-shaped magneto-optical recording medium with a laser beam to form a light spot from the optical pickup device and that sled-moves integrally with the optical pickup device in the track direction of the magneto-optical recording medium In a magneto-optical disk device in which a bias magnetic field is applied corresponding to a minute area of a light spot to write and read a magneto-optical signal, the magnetic head is mounted on a flying slider, and the magnetic head is Along with the slider, as a magnetic field modulation type bias magnetic field generator, an urging means for urging the magneto-optical recording medium to a loading position or an unloading position, and the urging means to operate the magnetic head. A first urging state in which the magnetic head is urged to the load position, and the magnetic head is in the unload position. A urging switching means for selectively switching a second urging state for urging the magneto-optical recording medium to an unloading state. It is configured to forcibly switch to the second biased state.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings. In the magneto-optical disk device shown here, an optical head (optical pickup device) 7 mounted on the carriage 5 by a seek motor and a magnetic head (not shown) facing the objective lens 8 provided on the optical head 7. And
Seek is working at the same time. The seek motor is a magnetic motor including a linear motor coil (not shown) provided on the carriage 5 and a magnet provided along a guide (not shown) that guides the carriage 5 via a bearing 6. It is composed of a circuit (not shown).

The magnetic head comprises a flying slider 11
The slider 11 is attached to the support beam 1
It is attached to the rotating member 9 of the magnetic head retracting mechanism via 0. In the present invention, the rotating member 9
Is pivotally supported on the carriage 5 by a support shaft, and is elastically supported by a biasing means 13 composed of a leaf spring attached to the end of the carriage 5 via an attachment bolt 4. That is, the rotating member 9 is attached to the urging means 1.
3 is integrally formed with a cam body having engaging surfaces 9a and 9b facing the elastic surface, and when the engaging surface 9a is in contact with the elastic surface, the slider 11 is moved to the spindle. The rotating member 9 is elastically held in a tilted state by the biasing means so as to be held at a position close to the disk surface of the magneto-optical recording medium 2 loaded on the motor 1 (see FIG. 1). When the engaging surface 9b is in contact with the elastic surface, the biasing means rotates the slider 11 so as to hold the slider 11 at a position (retracted position) away from the disk surface of the magneto-optical recording medium. The member 9 is elastically held in an inclined state (see FIG. 2).

Further, in the present invention, a bias switching means is provided so as to face the bias means 13. The urging switching means includes a first urging state for urging the magnetic head to a load position (a state shown in FIG. 1) and a second urging state for urging the magnetic head to an unload position. (The state shown in FIG. 2) is selectively switched. That is, the guide roller 13 is attached to the rear end of the rotating member 9, and the switching member 14 provided with the switching projection 14a is provided so as to be vertically movable so as to face the guide roller 13. Since the switching member 14 has a vertically extending guide slit 14b into which a guide pin 17 fixed to the device side (not shown) is inserted, the switching member 14 is guided vertically. To be done. Further, the switching member 14 is elastically held upward by a spring 16 and is urged downward by a solenoid mechanism 15. Therefore, as shown in FIG. 2, in the state before the carriage 5 starts the operation in the seek direction, the solenoid mechanism 1
When the protrusion 14a pushes down the guide roller 13 with the biasing force of 5, the rotating member 9 is rotated so that the slider 11 (that is, the magnetic head) is at the retracted position, and the biasing surface of the biasing means 12 is held. Releases the engagement with the engagement surface 9a, engages with the engagement surface 9b, and maintains the state. Therefore, even if the carriage 5 performs the seek operation, for example, when the cassette 3 of the optical modulation type magneto-optical recording medium is loaded in the deck and the recording medium is reproduced by the operation of the spindle motor 1, the magnetic force is reduced even if the carriage 5 performs the seek operation. The head maintains the retracted state.

If the solenoid mechanism 15 is not energized under the conditions such as when the cassette 3 of the magnetic modulation type magneto-optical recording medium is loaded in the deck, the spring 16 operates to operate the switching member 14. The guide roller 1 is held upward or by the protrusion 14a, the guide roller 1 is directed upward.
3 is pushed up, the elastic surface of the urging means 12 is the engaging surface 9a.
The state of being engaged with or is changed to that state. Therefore, even if the carriage 5 thereafter performs a seek operation and is separated from the switching means as shown in FIG. 1, the magnetic head together with the slider 11 can be maintained at the load position.

According to the present invention, when the cassette 3 of the magneto-optical recording medium is unloaded from the deck, even if the magnetic head is in the loading position immediately before, the cassette 3 is set as shown in FIG. The rotating member 9 can be pushed up to bring the magnetic head together with the slider 11 into a retracted state. As a result, the next time the magneto-optical recording medium is loaded, the magnetic head can be kept in the unloading state.

In the above embodiment, the condition for giving the energizing signal to the solenoid mechanism depends on whether or not the magneto-optical recording medium loaded in the deck is of the magnetic modulation type, but without using such a signal. It is also possible to make a judgment with a simple mechanical structure and to interlock with the bias switching means. As such a configuration, the embodiment shown in FIGS. 4 and 5 will be given. Here, the switching member 14 is elastically held downward by a spring 23, and the swing lever 21 is pivotally supported.
A sensor pin 21a is erected at one end thereof so as to correspond to the edge of the cassette 3 loaded on the deck, and the other end 21
b is engaged with an interlocking pin provided on the switching member 14. When the cassette 3 does not have the notch 3a (when a magnetic modulation type magneto-optical recording medium is loaded), the switching member 14 is pulled up against the spring 23 as shown in FIG. The head is loaded on the disk surface together with the slider 11, but the notch 3
When there is a, the sensor pin 21a can be guided there to exert the elastic force of the spring 23, lower the switching member 14, and raise the magnetic head together with the slider 3 to the retracted position.

Further, in the embodiment shown in FIGS. 6 and 7,
As a biasing means, instead of the leaf spring as in the above embodiment,
The toggle spring 32 is connected to the spring connecting pin 31 of the rotating member 9 and the spring connecting pin 33 provided on the carriage 5.
The one installed between and is used. Here, the rotating member 9 is urged to rotate counterclockwise in the position shown in FIG. 6, and is urged to rotate clockwise in the position shown in FIG. Since the means of the first embodiment can be used as it is for the reversing operation of the toggle spring 32,
Switching between loading and unloading of the magnetic head can be easily realized.

[0014]

As described in detail above, the present invention provides a magnetic head on a flying slider, and the magnetic head together with the slider serves as a magnetic field modulation type bias magnetic field generator for a magneto-optical recording medium. On the other hand, a biasing means for biasing the loading position or the unloading position, and a first biasing state for biasing the magnetic head to the loading position by operating the biasing means, and the magnetic head. A urging switching means for selectively switching between a second urging state for urging the magneto-optical recording medium to the unloading position. Since the force switching means is configured to forcibly switch to the second urging state, the magnetic head can maintain that state at the seek operation stage. Therefore, the retracting mechanism can be made compact and simple. It is possible to obtain an effect that can be of.

[Brief description of drawings]

FIG. 1 is a schematic side view showing functions in one embodiment of the present invention.

FIG. 2 is also a schematic side view for explaining the above function.

FIG. 3 is likewise a schematic side view for explaining the above function.

FIG. 4 is a schematic side view showing the functions of another embodiment of the present invention.

FIG. 5 is also a schematic side view for explaining the above function.

FIG. 6 is a schematic side view for explaining a function in still another embodiment of the present invention.

FIG. 7 is also a schematic side view for explaining the above function.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle motor 2 Magneto-optical recording medium 3 Cassette 3a Notch 5 Carriage 6 Bearing 8 Objective lens 9 Rotating member 9a, 9b Engaging surface 10 Support beam 11 Slider 12 Leaf spring 13 Roller 14 Switching member 14a Protrusion 15 Solenoid mechanism 16 Spring

Claims (1)

[Claims] 1. A disk-shaped magneto-optical recording medium is irradiated with laser light from an optical pickup device to form a light spot, and a thread is moved integrally with the optical pickup device in the track direction of the magneto-optical recording medium. In a magneto-optical disk device in which a bias magnetic field is applied from the magnetic head at least corresponding to the minute area of the light spot to write and read a magneto-optical signal,
The magnetic head is mounted on a flying slider, and the magnetic head together with the slider serves as a magnetic field modulation type bias magnetic field generator for urging the magneto-optical recording medium to a load position or an unload position. And a first biasing state for biasing the magnetic head to the load position by operating the biasing means, and
The magnetic head is provided with a bias switching means for selectively switching a second biasing state for biasing the magnetic head to the unloading position,
Further, in the unloading state of the magneto-optical recording medium, the magneto-optical recording medium cassette is configured to forcibly switch the energizing switching means to the second energizing state. ..