JPH05342737A - Opto-magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent a head from being loaded in the case of a double-sided disk by a method wherein a cam groove for holder and a cam groove for head are moved and controlled together by moving only a guide cam plate and the head is brought close to the disk stably. CONSTITUTION:A guide cam 35 is moved to a part between positions wherein a cartridge holder 22 and a magnetic head 25 are mounted and detached. Cam grooves 40, 42 for a holder 22 hold the holder 22 in a detaching position; they move and hold the holder 22 in its mounting position when the guide cam plate 35 is initially moved. Tn succession, earn grooves 41, 43 for a magnetic head hold the magnetic head in its detaching position, and move it to an intermediate position and a mounting position. A discrimination means 68, discriminates whether a magnetic disk 12 is single-side or double-side. When it is single-sided, the guide cam plate 35 is moved, and the head is moved to the mounting position by using a movement means. When it is double-sided, it is not moved and only a readout operation is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge holder, which is provided in the main body of the apparatus, movable to a loading position and an unloading position to be separated from the optical head, and to a magneto-optical disk. The present invention relates to a magneto-optical disk device equipped with a magnetic head that is movable between a loading position and an unloading position separated from the magneto-optical disk.

[0002]

2. Description of the Related Art For example, a magneto-optical disk device capable of repetitively recording information on a magneto-optical disk emits a laser beam of high power emitted from an optical head toward a recording layer of the loaded magneto-optical disk. Continuously converge, raise the temperature to the Curie temperature, and apply a bias magnetic field by the bias magnetic field generator (magnetic head) in the temperature rising state to align the magnetization direction of the magnetic body in the same direction as at initialization. After that, the bias magnetic field is reversed to intermittently converge the laser light having a large power on the recording layer, thereby reversing the magnetization direction and recording the information.

In the magneto-optical disk device having such a structure, in order to rewrite information of one track, it is necessary to rotate the magneto-optical disk for erasing and recording, which is a disadvantage of slow recording speed. Therefore, recently, by selectively applying a magnetic field of S or N to a minute region corresponding to a region where laser light is focused, it is possible to rewrite information by rotating the disc once. A modulation overwrite type magneto-optical disk device has been proposed.

In the magnetic field modulation overwrite type magneto-optical disk device, it is necessary to apply a high-speed modulated magnetic field to the magneto-optical disk in order to realize a rapid overwrite, and the magnetic head is downsized. Moreover, it is necessary to make it extremely close to the disc recording layer. For this reason, it is desirable that the magnetic head approaches the magneto-optical disk at the loading position in a stable state as much as possible.

Therefore, in the magneto-optical disk device of the same type, only the single-sided disk is suitable for use, and the double-sided disk is not suitable for use because the thickness thereof increases. Therefore, the magnetic head should be moved to the loading position only when the one-sided disk is loaded,
For example, if the magnetic head is loaded during loading of a double-sided disk, the magnetic head will slide on the glass (or resin) on the surface of the rotating disk due to the difference in thickness, and in a remarkable case, it may be damaged. ..

[0006]

It is an object of the present invention, based on the above-mentioned awareness, to allow a magnetic head to be loaded in a stable state, and not to load the magnetic head when the loaded magneto-optical disk is for both sides. The purpose is to provide a device.

[0007]

SUMMARY OF THE INVENTION The present invention, which achieves the above objects, therefore comprises:
With respect to the magneto-optical disk, a cartridge holder that holds a disk cartridge loaded with a magneto-optical disk and can be moved to a loading position approaching the optical head provided in the apparatus main body and an unloading position spaced from the optical head In a magneto-optical disk device equipped with a magnetic head that can be moved between an approaching loading position and an unloading position away from the magneto-optical disk, the movement moves the cartridge holder and the magnetic head to the loading position and the unloading position. And a guide cam plate for holding the cartridge holder at the unloading position at the initial position of the guide cam plate, and for moving and holding the cartridge holder at the initial position of the guide cam plate. And the initial move Holder cam groove continuing to hold the cartridge holder to the loading position when the subsequent movement;
And holding the magnetic head at the unloading position at the initial position of the guide cam plate, and moving the magnetic head between the unloading position and the loading position when the guide cam plate is initially moved, and It has a head cam groove that moves the magnetic head to the loading position during subsequent movement, and the guide cam plate moves the cartridge holder to the loading position by the holder cam groove and moves the magnetic head by the head cam groove. A disc discriminating means for discriminating whether the magneto-optical disc in the disc cartridge is one-sided or two-sided when the disc is moved to an intermediate position between the unloading position and the loading position; When it is determined that the disc is for one side, move the guide cam plate and It is characterized by having a moving means for moving the de the loading position.

[0008]

The present invention will be described below with reference to the illustrated embodiments.
FIG. 9 is a plan view showing a magneto-optical disk device 20 of the magnetic field modulation overwrite type to which the present invention is applied.
Is a side view thereof. This magneto-optical disk device 20 is
Disk cartridge 1 loaded with magneto-optical disk 12
1 and a cartridge holder 22 for holding the optical head unit 2
1 and an optical head carriage 23 for moving the optical head 24 in the radial direction of the magneto-optical disk 12 along a linear bearing 51 (FIG. 4) provided in the optical head portion 21.
And a magnetic head carriage 26 for moving the magnetic head 25 in the radial direction of the magneto-optical disk 12. Incidentally, reference numeral 54 in FIG. 9 is a shutter of the disk cartridge 11.

The cartridge holder 22 includes an optical head 24.
It is configured to be movable up and down with respect to the optical head 24. When the disc cartridge 11 is inserted or removed, the disc cartridge 11 is moved away from the optical head 24. The disk 12 can be set in place.

Outside the cartridge holder 22, the guide rollers 50 provided on the optical head portion 21 are slidable in the directions of arrows A and B in FIG. Guide cam plate 35
Is provided. The left and right guide cam plates 35 respectively have substantially crank-shaped holder cam grooves 40 and 42 and head cam grooves 41 and 43 formed at four positions. Left and right fixed cam plates 49 are provided outside the guide cam plate 35, and the left and right fixed cam plates 49 have holder cam grooves 40, 42 of the left and right guide cam plates 35.
Also, vertical guide cam grooves 45, 47, 46 are formed in the vertical direction so as to correspond to the head cam groove 41.

On the left and right side surfaces of the cartridge holder 22 in the disc moving direction, cam pins 36,
38, the cam pin 36 is inserted into the holder cam groove 40 and the vertical guide cam groove 45, and the cam pin 38 is inserted into the holder cam groove 42 and the vertical guide cam groove 47. Cam pins 37 and 39 are provided on the left and right side surfaces of the magnetic head carriage base 28. The cam pins 37 are inserted into the head cam groove 41 and the vertical guide cam groove 46. It is inserted into the groove 43.

The holder cam grooves 40 and 42 are provided with cam pins 36 and 38 at the initial position of the guide cam plate 35 shown in FIG.
For holding the disc cartridge 11 at the unloading position by holding
And the cam pins 36, 38 during the initial movement of the guide cam plate 35.
To move the disc cartridge 11 to the loading position and hold it at the same position.
have. The holder cam grooves 40 and 42 are further formed to be substantially horizontal, and allow the cam pins 36 and 38 to move idly without moving up and down to load the loading portions 40c and 4 that continuously hold the disc cartridge 11 at the loading position.
2c.

The head cam grooves 41 and 43 are provided with cam pins 37 and 39 at the initial position of the guide cam plate 35 shown in FIG.
Holding the magnetic head 25 (magnetic head carriage 2
6) is held at the unloading position, and the cam pins 37 and 39 are guided during the initial movement of the guide cam plate 35, and the magnetic head 25 is at an intermediate stage between the unloading position and the loading position. Moving parts 41b to be moved to the parts 41c, 43c,
It has 43b. The head cam grooves 41, 43 further move parts 41d, 43d for guiding the cam pins 37, 39 to move the magnetic head 25 to the loading position when the guide cam plate 35 moves following the initial movement, and the cam pins 37, 39. And holding the magnetic head 25 at the loading position.

A rack plate 59 and a switch operating plate 60 are fixed to the guide cam plate 35. Also, in the device body,
A drive motor 61 and a gear box 62 for transmitting the rotation of the drive motor 61 are provided, and the rotation of the drive motor 61 is transmitted as a linear motion to the rack plate 59 via the pinion gear 63. The drive motor 61 is configured to be normally driven via an interlocking circuit (not shown) when the disk cartridge 11 is loaded into the cartridge holder 22 and is pressed in the loading direction.

The main body of the apparatus has first, second and third detection switches 65, 66 and 6 corresponding to the switch operation plate 60.
7 is provided. These detection switches 65, 6
6, 67 are switch levers 65a, 66a,
67a. Detection switches 65, 66, 67
Is a switch operation plate 6 that moves together with the guide cam plate 35.
The switch lever 65a, 66a, 67a is pressed or released by 0 to turn it on or off, and the position of the guide cam plate 35 is detected based on this. By this detection, it is possible to detect the current state of the disk cartridge 11 and the magnetic head carriage base 28.

That is, in the switch operation plate 60, in the state of FIG. 1, the first detection switch 65 is turned off and the second detection switch 66 and the third detection switch 67 are turned on, and in the state of FIG. Detection switch 65 and the third detection switch 67 are turned off and the second detection switch 66 is turned on. In the state of FIG. 3, the first detection switch 65 is turned on and the second detection switch 66 and the third detection switch 66 are turned on. The detection switch 67 is off. By discriminating between these different bit signals by a discriminating circuit (not shown), the magneto-optical disk device 20 causes the magnetic head 25 to move.
Both the disc cartridge 11 and the disc cartridge 11 are in the unloading position, and the disc cartridge 11 can be attached and detached. The disc cartridge 11 is in the loading position and the magnetic head 25 is between the unloading position and the loading position. It is determined whether or not the magnetic head 25 is in the recording / reproducing enabled state in which the magnetic head 25 is set to the loading position together with the disc cartridge 11.

The magneto-optical disk 12 used in this embodiment.
For example, it is possible to write an optical code signal indicating whether the disc is a double-sided disc or a single-sided disc on the control track on the inner peripheral side. The optical code signal is read by the optical head 24 in the state of FIG. 2 in which the disk cartridge 11 is at the loading position and the magnetic head 25 is waiting at the intermediate position. Based on this, the disc discriminating means 68 (FIG. 9) discriminates whether the loaded magneto-optical disc 12 is for one side or for both sides. When the disc discriminating means 68 discriminates that the magneto-optical disc 12 is for both sides, only the reading by the optical head 24 is carried out without further moving the guide cam plate 35. Further, when it is determined that the magneto-optical disk 12 is for one side, the drive motor 61 is driven in the forward direction to further move the guide cam plate 35 in the same direction and move the magnetic head 25 to the loading position. Has been done.

As shown in FIG. 4, the optical head carriage 23 is supported by a linear bearing 51 so as to be movable along the radial direction of the magneto-optical disk 12.
Coil 52 fixed to both ends of optical head carriage 23
Are driven around a magnetic circuit 53 by a linear motor. The linear bearing 51 includes a fixed member 71, a movable member 72, and a ball 73 interposed between the fixed member 71 and the movable member 72. The fixed member 71 is a member that is attached to the optical head portion 21 side and that is formed in a substantially U-shape and is elongated. The movable member 72 is attached to the optical head carriage 23 side and compared to the fixed member 71. Then, it is a member that is narrow and substantially U-shaped and long. Rolling grooves are formed on the opposed side surfaces of the fixed member 71 and the movable member 72, and a ball 73 is fitted between the opposed rolling grooves.

Further, the optical head carriage 23 uses the objective lens to receive the light flux from the laser light source.
To read the magneto-optical recording signal by receiving the reflected light from the magneto-optical disk 12 during reproduction, and converging the laser light onto the magneto-optical disk 12 with a power higher than during reproduction to record the temperature of the recording layer. The Curie temperature is raised and information is overwritten on the recording layer in cooperation with the magnetic head 25.

The magnetic head carriage 26 is supported by a linear bearing 55 attached to the magnetic head carriage base 28 so as to be movable in the radial direction of the magneto-optical disk 12, and the magnetic head carriage 2 is provided.
It drives by the linear motor comprised by arranging the coil 56 fixed to both ends of 6 around the magnetic circuit 57. The linear bearing 55 includes a fixed member 75 and a movable member 7.
6 and a ball 77 interposed between the fixed member 75 and the movable member 76. Fixing member 75
Is a member that is attached to the optical head portion 21 side and that is formed in a substantially U shape and is elongated. The movable member 76 is attached to the optical head carriage 23 side and has a width that is larger than that of the fixed member 75. It is a narrow, substantially U-shaped and long member. Rolling grooves are formed on the opposite side surfaces of the fixed member 75 and the movable member 76, and a ball 77 is fitted between the facing rolling grooves.

At the end of the magnetic head carriage 26, two sets of photo reflectors 3 each having a light emitting / receiving element are provided.
0 and 31 are provided, and a reflection plate 32 is attached to the tip of the reflection plate holding portion 27 extending in the moving direction of the optical head carriage 23. Both carriages 23, 2
No. 6 is set so that the positions of both heads 24 and 25 coincide when the outputs from the two light receiving elements become equal.

The optical head carriage 23 is also driven in the radial direction of the magneto-optical disk 12 by a signal from a control device (not shown), and the magnetic head carriage 26 has two light receiving elements by a synchronizing circuit (not shown). Are controlled so that the outputs from are equal. As a result, the magnetic head carriage 26 can be moved in synchronization with the optical head carriage 23.

FIGS. 6 to 8 are enlarged views of the area around the air floating magnetic head 25. On the back surface of the magnetic head carriage 26, a cantilever flexure 15 is fixed by fixing screws 69 with its base located on the disk rotation center 12a side of the magneto-optical disk 12. A magnetic head 25 is attached to the free end of the flexure 15 facing the outer peripheral side of the magneto-optical disk 12. At the detachable position of FIG. 1, the flexure 15 bends downward until it comes into contact with the magnetic head pressing plate 70 and is in a state of being slightly inclined downward (FIG. 6), but at the loading position, the rotating magneto-optical disk 12 does. When it receives the wind pressure due to, it curls back upward and comes into a state of approaching the surface of the disk 12 at a very close distance as shown in FIG.

In the magneto-optical disk device having the above structure, when the disk cartridge 11 loaded in the cartridge holder 22 is pressed in the loading direction, the drive motor 61 is driven in the normal direction and the guide cam plate 35 is moved to the rack plate 59.
1 is moved from the initial position in FIG. 1 in the direction of arrow A in FIG.

As a result, in the disk cartridge 11 which is in the unloading position at the initial position of the guide cam plate 35, the guide pins 36 and 38 of the disk cartridge 11 are moved up and down with the initial movement of the guide cam plate 35. The guide roller 50 is guided by the moving portions 40b, 42b of the guide roller 42, and the lower surface thereof serves as a reference surface provided on the optical head portion 21.
Down until it abuts the upper surface 50a. At this time, as with the disk cartridge 11, the magnetic head 25, which was in the unloading position at the initial position of the guide cam plate 35, has its guide pins 37 and 39 moved in accordance with the initial movement of the guide cam plate 35. The guide pins 37 are guided by the moving portions 41b and 43b of the grooves 41 and 43,
39 is positioned at the intermediate step portions 41c and 43c and is made to stand by at an intermediate position between the unloading position and the loading position.

In this state, the switch operating plate 60 moving together with the guide cam plate 35 turns off the first detecting switch 65 and the third detecting switch 67 and turns on the second detecting switch 66. Based on the above, the guide cam plate 35 moves the cartridge holder 22 to the loading position by the holder cam grooves 40 and 42, and moves the magnetic head 25 to the intermediate position between the unloading position and the loading position by the head cam grooves 41 and 43. The movement is detected. Then, the optical head 24 reads the optical code signal written on the inner peripheral side of the magneto-optical disk 23, and the loaded magneto-optical disk 12 is for one side or for both sides based on this optical code signal. Is determined. As a result, if it is determined that the magneto-optical disk 12 is for both sides, the drive motor 61 is not driven and the guide cam plate 35 is not moved any more, so that only reading using the optical head 24 is executed. On the other hand, when it is determined that the magneto-optical disk 12 is for single-sided use, the drive motor 61 is driven in the forward direction, whereby the guide cam plate 3 is driven.
5 is further moved in the same direction, and the magnetic head 25 is moved to the loading position.

[0027]

As described above, according to the present invention, by merely moving the guide cam plate, the movement of both the cartridge holder and the magnetic head is controlled by the cam groove for the holder and the cam groove for the head provided on the guide cam plate. be able to. Furthermore, the magnetic head can be made to approach the magneto-optical disk at the loading position in an extremely stable state,
Further, since the magnetic head can be moved to the loading position only when the one-sided disk is loaded, the magnetic head is loaded when loading the two-sided disk having a different thickness, and the magnetic head slides on the rotating disk surface. It is possible to surely prevent a problem such as causing it.

[Brief description of drawings]

FIG. 1 is a side view showing a magneto-optical disk device of this embodiment in a removable position.

FIG. 2 is a side view showing the magneto-optical disk device of the embodiment in which the magnetic head is on standby between the unloading position and the loading position.

FIG. 3 is a side view showing the magneto-optical disk device of the embodiment in the recording / reproducing position.

4 is a diagram showing the magneto-optical disk device of FIG. 1 viewed from the direction of arrow D in FIG.

5 is a diagram showing the magneto-optical disk device of FIG. 3 viewed from the direction of arrow D in FIG.

FIG. 6 is a side view of an essential part when the magneto-optical disk device of the embodiment is in a removable position.

FIG. 7 is a side view of essential parts when the magneto-optical disk device of the embodiment is in a recording / reproducing position.

FIG. 8 is a plan view showing a main part of FIG.

FIG. 9 is a plan view showing the entire magneto-optical disk apparatus of the same embodiment.

[Explanation of symbols]

 11 Disk Cartridge 12 Magneto-optical Disk 20 Magneto-optical Disk Device 21 Optical Head Section 22 Cartridge Holder 23 Optical Head Carriage 24 Optical Head 25 Magnetic Head 26 Magnetic Head Carriage 27 Reflector Holding Section 28 Magnetic Head Carriage Base 30 31 Photo Reflector 35 Guide Cam Plate 36 37 38 39 39 Cam pin 40 42 Holder cam groove 41 43 Head cam groove 40a 42a 41a 43a Unloading part 40b 41b 42b 43b Moving part 40c 41e 42c 43e Loading part 41c 43c Intermediate step part 41d 43d 47 Moving part Guide cam groove 49 Fixed cam plate 50 Guide roller 59 Rack plate 60 Switch operation plate 61 Drive motor 62 Gear box 65 66 67 First, second, Third detection switch 68 disc discrimination means

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[Procedure amendment]

[Submission date] August 30, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art For example, in a conventional magneto-optical disk device capable of repeatedly recording information on a magneto-optical disk, a via layer is provided toward a recording layer of the loaded magneto-optical disk.
Bias for initialization by magnetic field generator (magnetic head)
After applying a magnetic field, the laser light with high power emitted from the optical head is continuously focused to produce a magneto-optical disk.
Raise the temperature of the recording layer to the Curie temperature ,
After the coercive force is eliminated, the recording layer is cooled during the cooling process.
Magnetization direction is the same as the initialization bias magnetic field,
After so-called initialization, the magnetic field is reversed to intermittently converge high power laser light on the recording layer, thereby reversing the direction of magnetization and recording information.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

Meanwhile, in the magneto-optical disk apparatus of the magnetic field modulation overwrite method, for rapid overwriting realized, it is necessary to apply a magnetic field modulated at a high speed in a magneto-optical disk, magnetic from the characteristics required on It is necessary to miniaturize the head and bring it very close to the disc recording layer. For this reason, it is desirable that the magnetic head approaches the magneto-optical disk at the loading position in a stable state as much as possible.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Used in the magneto-optical disk device 20 of this embodiment
The possible magneto-optical disk 12 is an international standard (ISO)
Double-sided disc and dedicated to the disc device 20 (non-ISO)
There is a single sided disc. International of these discs
Optical code for disc identification on standard double-sided disc
No new signal can be written, but this magneto-optical
The single-sided disk dedicated to the disk device 20 has this optical code signal.
Write the number on the inner control track, for example.
Is possible. Is this a double-sided disc?
The optical code signal that indicates whether the disk is
The ridge 11 is at the loading position and the magnetic head 25
In the state of Fig. 2 waiting at the intermediate position, the light
The disc 24 reads the disc discriminating means 68 (FIG. 9).
Get caught. Therefore, when the optical code signal is read
The disc discriminating means 68 causes the loaded magneto-optical
The air disk 12 is determined to be for one side. Based on this
Then, the drive motor 61 is driven in the forward direction to drive the guide cam plate 35.
Are further moved in the same direction, whereby the magnetic head 25
Is moved to the loading position for reading and recording
It is said to be in a noble state. In addition, in the state of FIG.
If the optical code signal is not read by the disk discriminating means 68,
If the loaded magneto-optical disk 12 is for both sides,
To be judged. In this case, the drive motor 61 is not driven,
Since the guide cam plate 35 is not moved any more,
The disk device 20 can only read by the optical head 24.
It becomes a noble state.

[Procedure correction 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0019

[Correction method] Change

[Correction content]

The optical head 24 converges the light flux from the laser light source onto the magneto-optical disk 12 by the objective lens, receives the reflected light from the magneto-optical disk 12 at the time of reproduction, reads the magneto-optical recording signal, and at the time of recording. The laser light is focused on the magneto-optical disk 12 with a power higher than that at the time of reproduction to raise the temperature of the recording layer to the Curie temperature, and cooperates with the magnetic head 25 to overwrite the information on the recording layer.

[Procedure amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

FIGS. 6 to 8 are enlarged views of the area around the air floating magnetic head 25. On the back surface of the magnetic head carriage 26, a cantilevered load beam 15 is fixed by a fixing screw 69 with its base located on the disk rotation center 12a side of the magneto-optical disk 12. Low
A magnetic head 25 is attached to the free end of the beam 15 facing the outer peripheral side of the magneto-optical disk 12. At the detachable position of FIG. 1, the load beam 15 bends downward until it comes into contact with the magnetic head pressing plate 70, and is in a state of being slightly inclined downward as shown in FIG . In this state, the drive motor 61 drives
Then, the guide cam plate 35 slides, so that the disc car
The ridge 11 is lowered to a predetermined position. Then magneto-optical
Since the air disk 12 is rotated, it is then
Magnetic with air-floating slider surface approaching 12
The head 25 rotates with the load of the load beam 15.
Stable at a position where the wind pressure from the magneto-optical disk 12 is balanced
Then, it becomes substantially parallel to the magneto-optical disk 12, and comes into a state of approaching the surface of the disk 12 at an extremely short distance as shown in FIG.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

In this state, the switch operating plate 60 moving together with the guide cam plate 35 turns off the first detecting switch 65 and the third detecting switch 67 and turns on the second detecting switch 66. Based on the above, the guide cam plate 35 moves the cartridge holder 22 to the loading position by the holder cam grooves 40 and 42, and moves the magnetic head 25 to the intermediate position between the unloading position and the loading position by the head cam grooves 41 and 43. The movement is detected. Then, the optical head 24, the optical code signal written inside the circumferential side magneto-optical disk 23 is loaded, on the basis of the optical code signal, di
Disk discriminating means 68, a magneto-optical disc 12 loaded is you determine whether a double-sided or a single-sided. As a result,
If it is determined that the magneto-optical disk 12 is for both sides, the drive motor 61 is not driven and the guide cam plate 35 is not moved any more. Therefore, the magneto-optical disk device 20 can only read using the optical head 24. It becomes a state . On the other hand,
When the optical disk 12 is determined to be a single-sided, the drive motor 61 is rotated forward, thereby the magneto-optical
The disk device 20 is moved further in the same direction the guide cam plate 35, moves the magnetic head 25 to the loading position
Then, recording and reproduction can be performed .

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

Front Page Continuation (72) Inventor Isao Okuda 2-36 Maenocho, Itabashi-ku, Tokyo Asahi Kogaku Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A cartridge holder, which holds a disk cartridge having a magneto-optical disk loaded therein and is movable between a loading position approaching an optical head provided in the apparatus body and an unloading position spaced from the optical head.
In a magneto-optical disk device provided with a magnetic head movable to a loading position approaching the magneto-optical disk and an unloading position separated from the magneto-optical disk, the movement causes the cartridge holder and the magnetic head to move to the loading position. And a guide cam plate for moving the cartridge holder to the unloading position, and the guide cam plate holds the cartridge holder at the unloading position at the initial position of the guide cam plate and moves the cartridge holder at the initial movement of the guide cam plate. A holder cam groove for moving and holding the cartridge holder at the loading position, and holding the cartridge holder at the loading position during the movement subsequent to the initial movement; and for holding the magnetic head at the unloading position at the initial position of the guide cam plate. Initial movement of guide cam plate Has a head cam groove for moving the magnetic head to an intermediate position between the unloading position and the loading position and for moving the magnetic head to the loading position when the guide cam plate moves following the initial movement. When the cartridge cam groove for the holder moves the cartridge holder to the loading position and the cam groove for the head moves the magnetic head between the unloading position and the loading position, the magneto-optical disk in the disk cartridge is a single-sided disk. Disc discriminating means for discriminating whether there is one side or for both sides; and, when the disc discriminating means judges that the magneto-optical disc is for one side, the guide cam plate is moved to move the magnetic head to the loading position. A magneto-optical disk device comprising moving means.