JP2596882Y2 - 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, and more particularly to an overwritable magneto-optical disk drive.

[0002]

2. Description of the Related Art For example, a conventional magneto-optical disk device capable of repeatedly recording information on a magneto-optical disk is provided with vias directed toward a recording layer of the loaded magneto-optical disk.
Bias for initialization by magnetic field generator (magnetic head)
On a magnetic field is applied, continuously converging the larger laser light power emitted from the optical head, the magneto-optical disk
Raise the temperature of the recording layer to the Curie temperature , and
After the coercive force disappears, the recording layer
Magnetization direction is the same as the initialization bias magnetic field,
After the so-called initialization, the bias magnetic field is inverted to intermittently converge the high-power laser light on the recording layer, thereby inverting the magnetization direction to record 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, respectively, which is disadvantageous in that the recording speed is low. Therefore, recently, by selectively applying a magnetic field of either S or N to a minute region corresponding to a region where laser light is converged, information can be rewritten only by rotating the disk once. A magneto-optical disk device of a modulation overwrite type has been proposed.

[0004] In the magneto-optical disk drive of the magnetic field modulation overwrite type, it is necessary to apply a high-speed modulated magnetic field to the magneto-optical disk in order to realize rapid overwriting, and the magnetic circuit is enlarged. Or
There is a possibility that the holding structure of the magnetic head moving mechanism is enlarged. Therefore, even in such a magnetic field modulation overwrite method, a magneto-optical disk device that can contribute to a reduction in the thickness of the magneto-optical disk device without reducing the driving force of the magnetic head moving mechanism is desired.

[0005]

The purpose of the present invention is to provide a magneto-optical disk capable of reducing the thickness of the entire apparatus without reducing the driving force of a magnetic head moving mechanism. It is intended to provide a device.

[0006]

Summary of invention The present invention to achieve the above object, comprises a f Ddoakusesu window, the disc cartridge housing a magneto-optical disc as an information recording medium therein; loading for moving the disc cartridge to the loading position and the unloading position Mechanism : Magneto-optical disk
Move the magnetic head in the direction perpendicular to the disk surface and
When the disc cartridge is in the unloading position
Holds the magnetic head away from the cartridge
The disc cartridge in the loading position.
Then, the magnetic head is moved from the head access window to the cart.
A magnetic head elevating mechanism for entering the ridge;
Drive the head in the radial direction of the magneto-optical disk, and
The magnetic head lifting mechanism moves the magneto-optical
Linear drive with magnetic head moved in the direction of contact and separation to disk
Moving mechanism; this magnetic head linear drive mechanism is a magnetic head
Moving guide means for guiding the disc in the radial direction of the disc,
On both sides of the magnetic head with respect to the moving axis by the moving guide means
The magnetic field generating member provided and the magnetic field generated by the magnetic field generating means.
Is fixed relative to the magnetic head and supplies current.
To move the magnetic head in the radial direction of the disk.
A magneto-optical disk drive comprising:
The field generating member is provided on the surface facing the magneto-optical disk.
Magnetic head lifts the magnetic head to the disk cartridge.
Head access together with the magnetic head when entering the printer.
The projecting part that enters the disc cartridge through the
It is characterized by having.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 10 is a plan view showing a magneto-optical disk drive 20 of a magnetic field modulation overwrite type to which the present invention is applied, and FIG. 4 is a side view thereof. This magneto-optical disk drive 20
Are arranged along a cartridge holder 22 for holding the disk cartridge 11 loaded with the magneto-optical disk 12, an optical head base 21, and a linear bearing 51 (FIGS. 1 to 3) provided on the optical head base 21. An optical head carriage 23 for moving the optical head 24 in the radial direction of the magneto-optical disk 12;
Has a magnetic head carriage 26 that moves in the radial direction.

The disk cartridge 11 is configured so that the magneto-optical disk 12 can be housed inward, and has a head access window 11a (FIGS. 1 to 3 and FIG. 10) on its upper surface.
And a shutter 54 that can be opened and closed to close and open the head access window 11a. As shown in FIG. 7, the cartridge holder 22 for holding the disc cartridge 11
A shutter open arm 100 rotatably supported by a rotation support shaft 106 and a shutter open arm 101 rotatably supported by a rotation support shaft 107. The shutter open arm 100 is for the disk A surface (single-sided disk A surface, double-sided disk A surface).
Reference numeral 1 denotes a surface B, and when the disk cartridge 11 is loaded into the cartridge holder 22, each of the leading ends is engaged with a corresponding portion of the shutter 54 to be rotated, whereby the head access window 11a is rotated. , 11b
(FIG. 1) is released.

At the front of the cartridge holder 22,
In the vicinity of the pivots 106 and 107, arc-shaped guide grooves 10 are provided.
2 and 103 are formed. A guide pin 108 is provided in the guide groove 102 near the rotation support shaft 106 of the shutter open arm 100, and a guide pin 108 is provided in the guide groove 103 near the rotation support shaft 107 of the shutter open arm 101. Are slidably inserted respectively. The shutter open arms 100 and 101 are provided with coil springs 104 and 105 wound around pivots 106 and 107, respectively.
Thus, each of them is always urged to rotate to the position shown in FIG.

At the front of the cartridge holder 22, there is provided a loading switch 80 which is turned on by a detection lever 130 which is pressed by the loaded disk cartridge 11 and rotates about a rotation support shaft 131. The drive motor 61 is driven based on the switch 80 being turned on. The cartridge holder 22 is also configured to be able to move up and down with respect to the optical head 24, is located away from the optical head 24 when the disk cartridge 11 is attached and detached, and comes close to the optical head 24 when the disk cartridge 11 is inserted. Move in the direction of
2 can be set at a predetermined position.

On the outer side of the cartridge holder 22, the guide rollers 50 provided on the optical head base 21 are slidable in the directions of arrows A and B in FIG. Guide cam plate 3
5 are provided. The left and right guide cam plates 35 are respectively formed at four positions thereof, and are substantially cam-shaped holder cam grooves 40 and 42 and magnetic head cam grooves 41 and 43.
have. Further, left and right fixed cam plates 49 are provided outside the guide cam plate 35, and the left and right fixed cam plates 4 are provided.
9, a cam groove 40 for the holder of the left and right guide cam plates 35,
42 and the magnetic head cam groove 41,
Up and down guide cam grooves 45, 47 and 46 are formed in the up and down direction.

Cam pins 36, 3 are provided on the left and right sides of the cartridge holder 22 in the disk moving direction, respectively.
The cam pin 36 is inserted through the holder cam groove 40 and the vertical guide cam groove 45, and the cam pin 3
Reference numeral 8 is inserted into the holder cam groove 42 and the vertical guide cam groove 47. The left and right side surfaces of the magnetic head base 28 are provided with cam pins 37 and 39, respectively. The cam pins 37 are inserted into the magnetic head cam groove 41 and the vertical guide cam groove 46, and the cam pin 39 is used for the magnetic head. It is inserted through the cam groove 43.

The holder cam grooves 40 and 42 are provided at the initial positions of the guide cam plate 35 shown in FIG.
Unloading sections 40a and 42a for holding the disk cartridge 11 at the unloading position while holding
And the cam pins 36, 38 when the guide cam plate 35 is initially moved.
Moving portions 40b and 42b for guiding the disk cartridge 11 to the loading position and holding the same at the loading position.
have. The holder cam grooves 40, 42 have loading portions 40c, 42c. The loading portions 40c and 42c are formed substantially horizontally, and
The disc cartridge 11 is kept at the loading position by moving the disc cartridges 6 and 38 without moving them up and down.

The magnetic head cam grooves 41 and 43 are provided at the initial position of the guide cam plate 35 shown in FIG.
Unloading portions 41a and 43a that hold the magnetic head 25 (magnetic head carriage 26) at the unloading position while holding the 39, and guide the cam pins 37 and 39 during the initial movement of the guide cam plate 35, thereby unloading the magnetic head 25. Moving part 41 to be moved to intermediate step parts 41c and 43c which are intermediate positions between the loading position and the loading position.
b, 43b. Cam groove 41, 4 for magnetic head
Moving parts 41d and 43d for guiding the cam pins 37 and 39 to move the magnetic head 25 to the loading position at the time of movement following the initial movement of the guide cam plate 35;
It has loading portions 41e and 43e for holding the cam pins 37 and 39 and holding the magnetic head 25 at the loading position. These cam grooves 41, 43, cam pin 37,
Reference numeral 39 denotes the magnetic head 25 which is a disk of the magneto-optical disk 12.
A lifting mechanism that moves in a direction perpendicular to the
You.

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

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

That is, in the switch operation plate 60, the first detection switch 65 is turned off and the second detection switch 66 and the third detection switch 67 are turned on in the state of FIG. 6 and the third detection switch 67 are turned off and the second detection switch 66 is turned on. In the state of FIG. 6, 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.

These different bit signals are discriminated by a discriminating circuit (not shown), and the magneto-optical disk drive 20 is discriminated.
However, when the magnetic head 25 and the disk cartridge 11 are both in the unloading position and the disk cartridge 11
Disk cartridge 1 in a detachable state in which the disk can be detached
1 is located at the loading position and the magnetic head 25 is located between the unloading position and the loading position, in a reproducible state in which reproduction using only the optical head 24 is possible. It is possible to determine which of the recorded / reproducible states has been set.

The magneto-optical disk 12 used in this embodiment
For example, an optical code signal indicating whether the disc is a double-sided disc or a single-sided disc can be written in a control track on the inner peripheral side. This optical code signal is read by the optical head 24 in the state of FIG. 2 where 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. 10) discriminates whether the loaded magneto-optical disc 12 is for one side or both sides. When the disc discriminating means 68 discriminates that the magneto-optical disc 12 is for double-sided use, the optical head 2 is moved in order to prevent the guide cam plate 35 from moving any further.
4 is ready for reading. The magneto-optical disk 12 when it is determined that a one-sided, because moved further in the same direction to guide the cam plate 35 a drive motor 61 driven forward to, by moving the magnetic head 25 to the loading position , read and capable of recording state and ing.

The optical head carriage 23 is supported via a linear bearing 51 so as to be movable in the radial direction of the magneto-optical disk 12 as shown in FIGS. The optical head carriage 23 is driven by a linear motor mechanism 90 in which coils 52 fixed to both ends of the optical head carriage 23 are arranged around a magnetic circuit 53 having a permanent magnet 53a and a yoke 53b.

The linear bearing 51 includes a fixing member 71,
It comprises 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 substantially U-shaped and long member attached to the optical head base 21 side.
Reference numeral 2 denotes a member which is attached to the optical head carriage 23 side and is formed to have a substantially U-shape and a long width narrower than the fixing member 71. Rolling grooves are formed on opposing side surfaces of the fixed member 71 and the movable member 72, and a ball 73 is fitted between the opposing rolling grooves.

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

The magnetic head carriage 26 is mounted on the magneto-optical disk 12 by a linear bearing 55 attached to the magnetic head base 28 via a slider base 87.
Are supported so as to be movable in the radial direction. And the magnetic head carriage 26 is the magnetic head carriage 2
6 are driven by a linear motor mechanism 91 which is arranged around a magnetic circuit (magnetic field generating member) 57 having a permanent magnet 57a and a yoke 57b. That is, the magnetic head carriage 26 is
The above-mentioned means for guiding in the radial direction and the linear motor
The mechanism 91 connects the magnetic head 24 to the magneto-optical disk 12.
It constitutes a linear drive mechanism for driving in the radial direction.

The present invention provides a linear drive for the magnetic head.
Features magnetic circuit (magnetic field generating member) 57 that composes the structure
doing. The magnetic circuit 57 is formed as being configured Intention to central portion around the magnetic head 25 (FIG. 8), and enters the step portion 88 outer portion of the yoke 57b is partially notched (FIG. 9) ing. That is, as shown in FIGS.
As described above, the magnetic circuit 57 is adjacent to the magnetic head 25.
At the position facing the magneto-optical disk 12
A substantially same amount of protrusion as the magnetic head 25 toward the magnetic disk 12
And the seek direction of the magnetic head 25 (disc radius
Head access window 11a in a direction orthogonal to
A narrower projection is provided. As a result , in order to write information , the magnetic head 2 is attached to the magneto-optical disk 12 of the disk cartridge 11 located at the loading position.
5 moves the magnetic head carriage 26 close to
When (FIG. 3), a part of the magnetic circuit 57 (projecting
Part) together with the magnetic head 25 can enter the head access window 11a opened by the movement of the shutter 54. Therefore, the magnetic circuit 57 can be reduced in size and thickness, and can contribute to a reduction in the thickness of the entire magneto-optical disk device without reducing the driving force of the magnetic head moving mechanism.

The linear bearing 55 includes a fixing member 7
5, the movable member 76 and the fixed member 75 and the movable member 76
And a ball 77 interposed therebetween.
The fixed member 75 is a substantially U-shaped and elongated member attached to the optical head base 21 side, and the movable member 76 is attached to the optical head carriage 23 side, It is a member which is narrower, formed in a substantially U-shape and longer. Rolling grooves are formed on opposing side surfaces of the fixed member 75 and the movable member 76, and a ball 77 is fitted between the opposing rolling grooves.

As shown in FIG. 4, two sets of reflective photosensors (photointerrupters) 30 and 3 having both light emitting / receiving elements are provided at the end of the magnetic head carriage 26.
1 is provided, and a reflecting plate 3 is provided at an end of a reflecting plate holding portion 27 extending in the moving direction of the optical head carriage 23.
2 are installed. Both carriages 23, 26
When the outputs from the two light receiving elements are equal, the positions of the two heads 24 and 25 are set to coincide.

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 is driven by a synchronous circuit (not shown) by two light receiving elements. Are controlled so that the outputs from the. Thereby, the magnetic head carriage 26 can be moved in synchronization with the optical head carriage 23.

FIG. 10 shows an air floating type magnetic head 2.
FIG. 8 is an enlarged plan view of the magnetic head 25 part, and FIG. 9 is an enlarged bottom view showing the magnetic head 25 part viewed from the back side. That is,
The back of the magnetic head carriage 26 has a cantilever load
The beam 15 is fixed by a fixing screw 69 with its base positioned on the disk rotation center 12 a side of the magneto-optical disk 12. Magneto-optical disk 12 of load beam 15
A magnetic head 25
Is attached. In the detachable state shown in FIG. 4, the load beam 15 bends downward until it comes into contact with the magnetic head holding plate 70, and is slightly inclined downward . This
When the drive motor 61 is driven in the state shown in FIG.
The disk 35 slides, and the disk cartridge 1
1 is lowered to a predetermined position. Then the magneto-optical disk
12 is rotated, so that the
A magnetic head 25 having an air-floating slider surface approaching
Is stable at a position where the load by the load beam 15 and the wind pressure by the rotating magneto-optical disk 12 are balanced, and the magneto-optical
The disk 12 is substantially parallel to the disk 12 and is very close to the surface of the disk 12.

The present magneto-optical disk drive 2 having the above configuration
0, when the disc cartridge 11 loaded in the cartridge holder 22 is pressed in the loading direction, the shutter open arm 100 is rotated counterclockwise in FIG. 7 to turn on the loading switch 80, and the driving motor 61 is driven forward, and the guide cam plate 35 is moved from the initial position in FIG.
Moved in the direction.

When the guide cam plate 35 is in the unloading position at the initial position (FIG. 1), 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. 40, 4
It is guided by the second moving parts 40b and 42b, and descends until its lower surface comes into contact with the upper surface 50a of the guide roller 50 serving as a reference surface provided on the optical head base 21. At this time, similarly to 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, 39 moved along with the initial movement of the guide cam plate 35. Cam groove 4
The guide pins 37, 39 are guided by the moving portions 41b, 43b of the first and fourth 43, and are positioned at the intermediate step portions 41c, 43c, and wait at an intermediate position between the unloading position and the loading position (FIGS. 2, 5). .

At this time, the first detection switch 65 is operated by the switch operation plate 60 which moves together with the guide cam plate 35.
And the third detection switch 67 is turned off and the second detection switch 66 is turned on. Based on this, the guide cam plate 35 moves the cartridge holder 22 to the loading position by the holder cam grooves 40 and 42. And the magnetic head cam grooves 41 and 43 detect that the magnetic head 25 has been moved to an intermediate position between the unloading position and the loading position. Then, the optical code signal written on the inner peripheral side of the magneto-optical disk optical head carriage 23 is read by the optical head 24, and based on the optical code signal, the disk discriminating means 68 determines whether the loaded magneto-optical disk 12 is whether it is for both sides whether it is for one side to another determine <br/>.

[0032] As a result, if it is determined that the optical disk 12 is a double-sided, the drive motor 61 is not driven, since the guide cam plate 35 is not moved further, magneto-optical Di
Disk device 20 is only the ready reproduction using an optical head 24. On the other hand, when it is determined that the magneto-optical disk 12 is for one side, the drive motor 61 is driven to rotate forward, and
As a result, the magneto-optical disk device 20
Further moved in the same direction, moving the magnetic head 25 to Rohde <br/> Ingu position, recording and reproduction is ready (Fig. 3, Fig. 6).

At this time, the magnetic head 25 is moved to the disk radius.
The linear drive mechanism for driving in the direction has an entry step 88 formed in a magnetic circuit 57 which is a part of the component, so that the head access window 11a opened by the movement of the shutter 54 has the magnetic circuit 57 lower part (projection
Part) can be entered.

[0034]

According to the present invention as described above, according to the invention], in the head access window of the disk cartridge in the loading position, for transporting the magnetic head in the radial direction of the disc
A part of the components of the magnetic head linear drive mechanism (linear motor mechanism) can be made to enter together with the magnetic head, so that the space efficiency can be improved without reducing the driving force of the magnetic head moving mechanism, and the magneto-optical disk drive can be improved. It is possible to reduce the overall thickness.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a state where the magneto-optical disk device of FIG. 5 is viewed from the direction of arrow E in FIG.

FIG. 3 is a diagram showing a state where the magneto-optical disk device of FIG. 6 is viewed from the direction of arrow F in FIG.

FIG. 4 is a side view showing the magneto-optical disk device of the embodiment in a detachable state.

FIG. 5 is a side view showing the magneto-optical disk device of the embodiment in a reproducible state.

FIG. 6 is a side view showing the magneto-optical disk device of the embodiment in a recording / reproducing state.

FIG. 7 is a plan view showing a cartridge holder.

FIG. 8 is an enlarged plan view showing a magnetic head portion.

FIG. 9 is a bottom view showing a state where the magnetic head portion of FIG. 8 is viewed from the back side.

FIG. 10 is a plan view showing the magneto-optical disk device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Disk cartridge 11a Head access window 12 Magneto-optical disk 20 Magneto-optical disk drive 22 Cartridge holder 25 Magnetic head 26 Magnetic head carriage 54 Shutter 57 Magnetic circuit 57a Permanent magnet 57b Yoke 88 Entry step portion

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Isao Okuda 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Optical Industry Co., Ltd. (56) References JP-A-3-113772 (JP, A) JP Hei 4-111244 (JP, A) JP-A-4-78730 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 11/10 G11B 5/02

Claims (1)

(57) [Scope of request for utility model registration] And the disk surface of the magneto-optical disk; loading mechanism for moving the disc cartridge to the loading position and the unloading position; to claim 1 further comprising a head access window, the disc cartridge housing a magneto-optical disc as an information recording medium therein Magnetic heads in orthogonal directions
The disk cartridge and unload the disc cartridge.
When the magnetic head is in the
Hold it at a separated position, and
The magnetic head against the head cartridge.
Magnetic head ascending into the cartridge from the access window
Lowering mechanism; and the magnetic head in the radial direction of the magneto-optical disk
And the magnetic head lifting mechanism moves the magnetic head
Is moved in the direction of contact and separation with the magneto-optical disk together with the
Magnetic head linear drive mechanism: This magnetic head linear drive mechanism
Movement guide means for guiding in the disk radial direction, and this movement plan
The magnets provided on both sides of the magnetic head with respect to the movement axis by the internal means
In the magnetic field generated by the field generating member and the magnetic field generating means.
The magnetic head is fixed relative to the magnetic head, and
Coil that applies a moving force to the air head in the radial direction of the disk
Having bets; magneto-optical disk apparatus having a magnetic field generation members constituting the magnetic head linear drive mechanism
Is located above the surface facing the magneto-optical disk.
The lowering mechanism moves the magnetic head into the disk cartridge.
When it is inserted, the data is
To have a protruding part to enter the disk cartridge
A magneto-optical disk device characterized by the above-mentioned.