JP2548244B2 - Magneto-optical disk device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records information on a disc by irradiating a disc-shaped recording medium (hereinafter referred to as a disc) with a magnetic field and irradiating a laser beam focused on a minute amount of light. The present invention relates to a magneto-optical disk device that erases or reproduces information recorded on a disk.

2. Description of the Related Art Magneto-optical disk devices have rapidly become popular as new external storage devices in recent years because of their large memory capacity per unit area and the ability to record and erase information. However, there is a strong demand from the standpoint of using this device. For this reason, it has been conventionally attempted to reduce the size and weight of the head to realize a smaller and thinner device. However, the magneto-optical disk device has a magnetic bias unit that functionally applies a magnetic field to the disk recording surface. Therefore, the device is disadvantageous in reducing the thickness, and the device is generally thick.

An example of the above-described conventional magneto-optical disk device will be described below with reference to the drawings. FIG. 13 shows an operating state of a magnetic bias unit of a conventional magneto-optical disk device, where 1 is a cartridge containing a disk 2, 3 is a disk motor for rotating the disk, 4 is a disk clamper, and 5 is the disk 2 described above. A head for reading, recording, or erasing information by scanning in the radial direction (indicated by an arrow in the figure). 8 is a magnetic bias for applying a magnetic field to the disk recording surface 2a, which is arranged so as to face the head. As shown in, it moves up and down together with the loading operation of the disc. FIG. 14 shows the state of this magnetic bias viewed from the back side. The structure is such that the coil 10 is wound in multiple layers around the yoke 9, and the length l _{1 of the} yoke is equivalent to the recording length of the disk. It is set longer than the above, and is set so that information can be stably recorded on the disk 2 at any access position of the head 5.

The operation of the magneto-optical disk device configured as described above will be described. When the cartridge 1 is inserted into the device, the mechanical loading operation causes the cartridge 1
Is transferred onto the disk motor 3, and at the same time, the disk 2 is clamped by the clamper 4 by the same mechanical means, and then the disk 2 is rotated in the cartridge 1 by the disk motor 3. On the other hand, the magnetic bias 8 is arranged on the disk recording surface 2a integrally with the loading operation, and when the coil 10 is energized and excited, a magnetic field of N pole or S pole is uniformly applied from the yoke 9 to the disk recording surface 2a. Then, information was recorded or erased on the disk by irradiating the laser light from the head 5 next.

Problems to be Solved by the Invention However, in the above configuration, the magnetic bias 8
There the move up and down so the loading operation and integral, in a series of mechanical operations from the insertion of the disc to the clamp, as shown in FIG. 13, the l _2, including the thickness of the magnetic bias 8 as a device The height (thickness) is required, and there is a limit to the demand for thinning of the device because the magnetic bias 8 has a thickness for ensuring the strength of the magnetic field necessary for its function.

Further, FIG. 15 was easily devised for the purpose of eliminating this drawback. Unlike the above-mentioned conventional example, the magnetic bias 8 is provided independently of the loading mechanism of the apparatus, and the disk 2
Is clamped in the device and then slid onto the disc recording surface 2a. According to this, the thickness of the device can be reduced by an amount corresponding to the vertical movement of the magnetic bias 8, as indicated by l ₃ in the figure. However, in this configuration, an actuator for sliding the magnetic bias 8 on the disk is required, and it is possible to reduce the thickness of the device by reducing the cost of the device and also by incorporating the actuator into the device. However, there is a problem that the volume of the entire device does not become so small.

In view of the above problems, the present invention does not require a special actuator for moving the magnetic bias, and moves the magnetic bias to a position facing the head via the disk with a very simple structure, and makes the device thin and compact. The present invention provides a magneto-optical disk device that realizes the following.

Means for Solving the Problems In order to solve the above problems, a magneto-optical disk device of the present invention is a cartridge for housing a disk, a disk motor for rotating the disk, and a head for reading or erasing information. A magnetic bias for applying a magnetic field to the disk, a mechanism section for loading and ejecting the disk, and a drive motor for the mechanism section.
The magnetic bias is slidably disposed at a position facing the head, and a magnetic bias slide mechanism is provided for sliding the magnetic bias by the drive motor after a disk is loaded by the drive motor. . According to a second aspect of the present invention, a cartridge for accommodating a disk, a disk motor for rotating the disk, a head for reading or erasing information, and a head provided to face this head are provided with a magnetic field. A magnetic bias to be applied, and a mechanism for loading and ejecting the disc,
A drive motor of the mechanism section, and the magnetic bias is slidably disposed at a position facing the head,
Further, means for providing a magnetic bias corresponding to the access operation of the head and providing an access operation independently of the head at a position facing the head, and for driving the access operation means of the magnetic bias by the drive motor. Is.

With the above-described structure, the present invention makes the device thinner by sliding the magnetic bias to a position facing the head after loading the disk, and also has a drive motor for performing the eject operation of the disk. The cost and size of the device can be reduced by the configuration in which the operation is also performed.

Also, by operating the magnetic bias in correspondence with the head access operation, the magnetic bias can be made smaller,
Further, the size of the device can be reduced.

Example A magneto-optical disk device according to an example of the present invention will be described below with reference to the drawings.

1 to 3, FIG. 1 is an external perspective view of a magneto-optical disk device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is an exploded perspective view of a magnetic bias portion in particular. Is shown. Further, FIGS. 4 to 10 show operation state diagrams thereof. In FIGS. 1 to 3, reference numeral 20 denotes a disk, 22 denotes a cartridge for accommodating the disk 20, and in order to simplify the description, here, a shutter 23 for preventing dust from entering the cartridge is always open. I will proceed with the explanation. 24 is fixed to the base 25,
This is a disk motor that clamps and rotates the disk 20, but the details of the disk clamping mechanism will be omitted for the sake of brevity and simplification of the description.

28 is a head that scans the disk 20 in the radial direction by a pair of guide shafts 29a and 29b, and 30 is a housing that houses the cartridge 22, and four rollers 31a, 31b and 31c that are rotatably engaged with groove cams described later. , 31d. Reference numeral 32 is a housing guide hole that slides with a guide shaft, which will be described later.
30 moves vertically with a guide shaft 39, which will be described later, as a guide.
33 is located on the base 25 and fixed to the base 25
It is an eject plate in the shape of a U which is guided in the direction of its movement by the four pins 34 and is always urged by the spring 35 in the direction of the arrow 36. The elongated plates 37 are slidable with the four pins 34, respectively.
a, 37b, 37c, 37d are provided, and the stroke of the eject plate 33 in the arrow direction 36 is determined by the collision between the pin 34 and the elongated holes 37a to 37d due to the biasing force of the spring 35. Reference numeral 1 shown in FIG. 5 indicates a moving stroke of the eject plate 33. Further, 33a is an engaging portion having a square hole that engages with an eject pin which will be described later, and 38a, 38b, 38c and 38d are the rollers 31a.
~ 31d rotatably engaged by the operation of the eject plate 33 at the time of loading and ejecting, groove cam for forcibly moving the housing 30 in the vertical direction along the groove, 39 is fixed to the base 25, This housing
It is a guide shaft that slides in the guide hole 32 of 30 and guides the movement in the vertical direction.

Explaining the operation of the eject plate 33, the movement in the arrow direction 36 is the loading operation of the disk 20 for lowering the cartridge 22 onto the disk motor 24 through the rollers 31a to 31d and the groove cams 38a to 38d, and the arrow direction. The direction opposite to the direction 36 is for ejecting the cartridge 23 to the original insertion position and ejecting it outside the apparatus.

Reference numeral 40 designates the guide shaft 39 as a support shaft, which is a lock lever provided rotatably, and is arranged in the device of the eject plate lock pin 41 and the cartridge 22 for preventing movement of the eject plate 33 in the arrow (loading) direction 36. The cartridge contact pins 43, which are provided so as to come into contact with the tip end portion 22a thereof when the lock lever 40 is inserted, for rotating the lock lever 40 in the arrow direction 42, are fixed. Reference numeral 44 is a torsion spring provided on the guide shaft 39 for returning the lock lever 40. The fifth
As shown in the figure, 45 is a notch provided in the eject plate 33, and the eject plate lock pin 41 is normally engaged with this notch as shown in FIG.
The movement of 33 in the loading direction 36 is prevented.

Reference numeral 50 denotes a magnetic bias having the same configuration as that of the conventional example shown in FIG. 14, and a coil is wound around the yoke 51 in multiple layers. 53
Is a roller which is rotatably engaged with a rail portion of a magnetic bias guide member described later, and 54 is a pin which is engaged with one end of a magnetic bias driving lever described later. 55 is a pair of rails fixed to the base 25 and guiding the magnetic bias 50.
A pair of rails 56a and 56b are provided with a pair of rails, through which the magnetic bias is applied during operation of the device via the rollers 53.
The guide groove 50 slides 50 on the disk and outside the operating range of the cartridge 22 at the time of loading and ejecting the cartridge 22. Reference numeral 57 is a lever for driving a magnetic bias having a gear 57a at its center, the tip of which has an elongated hole portion 57b that engages with the pin 54. Magnetic bias 50
Is slid along the rails 56a and 56b. Reference numeral 58 is a support shaft of the lever 57 fixed to the guide member 55, and 59 is a rack which slides with two pins 60 similarly fixed to the guide member 55 as guides, and is a gear 57a of the lever 57. It is in mesh. Reference numeral 61 is a rack return spring provided in the rack 59.

Reference numeral 62 is a bracket of a drive motor fixed to the base 25, and 63 is a drive motor fixed to the bracket. In this embodiment, a step motor is used. 64 is a worm, 65 is a worm gear, and 66 is an intermediate gear. 67
Is a drive shaft rotatably provided on the bracket 62,
A drive gear 68 meshing with the intermediate gear 66 is fixed. Reference numeral 69 denotes a drive pin fixed to this drive gear, which is provided so as to come into contact with the tip portion 59a of the rack 59, and the rack 59 is guided by the two pins 60 as a guide in the arrow direction 52 by the rotation of the drive gear 68. Slide it on. Reference numeral 70 denotes an eject arm fixed to the drive shaft 68, and an eject pin 71 that comes into contact with the square hole engaging portion 33a of the eject plate is provided at the tip end portion of the eject arm. Reference numeral 72 is an origin detecting plate provided on the drive shaft 67, and the origin is confirmed by the photosensor 73 with respect to the slit 72a provided on the origin detecting plate.

The operation of the magneto-optical disk device configured as described above will be described below with reference to FIGS. 4 to 10.

FIG. 4 shows a side view of the device at the start,
FIG. 5 is a plan view in which the housing 30 is omitted in this state. At the start, the eject plate 33 has the eject plate lock pin in the notch 45 as described above.
Since 41 is engaged, the urging force of the spring 35 is blocked and the spring 35 is stationary. Further, the positions of the eject pin 71 and the square hole engaging portion 33a are in the relationship shown in FIG.
A space for 3 movement strokes 1 is secured. On the other hand, at this time, the magnetic bias 50 is located outside the insertion space of the cartridge 22, and the origin detection plate slit
The positional relationship between 72a and the photo sensor 73 is in the ON state.
FIG. 6 shows the moment when the cartridge 22 is inserted to a predetermined position. When the cartridge 22 is manually inserted, the tip 22a of the cartridge 22 comes into contact with the cartridge contact pin 43 fixed to the lock lever 40. Contact, torsion spring
The lock lever 40 is rotated in the arrow direction 42 against the urging force of the lever 44, and the engagement of the eject plate lock pin 41, which was engaged in the start state, with the notch 45 is released. FIG. 7 shows a state in which the eject plate 33 is moved in the direction of arrow 36 by the stroke l by the urging force of the spring 35. At this time, as shown in FIG. 8, the housing 30 is provided with the roller 31a. ~ 31d through the groove cam 38 of the eject plate 33
As described above, the cartridges 22 are vertically pushed down along the guide shaft 39 by the a to 38d, and the cartridge 22 is transferred onto the disk motor 24. Further, at this time, due to the movement of the eject plate 33, the distance between the eject pin 71 and the square hole engaging portion 33a shown in FIG.

Now, when the cartridge 22 is mounted in the bag holder, it is necessary to slide the magnetic bias 50 on the disk next, but this is done by driving the step motor which is the driving motor in this embodiment. Has been done. That is, when the step motor is driven by the number of steps corresponding to the movement stroke of the magnetic bias 50, the rotational force of the step motor is driven via the worm 64, the worm gear 65, and the intermediate gear 66.
By a drive pin 69 which is transmitted to the drive gear so as to rotate in the anti-time direction and is then fixed to the drive gear.
Slide along arrow 60 in the direction of arrow 52. The sliding of the rack 59 causes the lever 57 to swing via a gear 57a meshing with the rack 59, and the magnetic bias 50 is slid to a predetermined position. This state is shown in FIG. At this time, the arm 70 integrated with the drive shaft 68 also rotates the square hole of the eject plate counterclockwise to the rotating position shown in the figure, but has no effect on the plate cam. When the magnetic bias coil 52 is energized in this state, a magnetic field is applied from the yoke 51 to the disk 20, and recording or erasing operation can be performed at any position of the head.

Next, the eject operation will be described. In order to eject the cartridge to the outside of the apparatus by the eject command, it is necessary to first return the magnetic bias 50 to the original position shown in FIG. When the driving force in the opposite direction is given by the amount equivalent to the movement of the magnetic bias in the same manner as described above, the magnetic bias 50 returns to its original position in the reverse order of the above description, but the restoring force is the spring provided on the rack 59. 61 urging forces. When the magnetic bias 50 returns to the original position and returns to the state shown in FIG. 5, the same clockwise rotating force is applied to the drive shaft 67, and the eject pin 71 provided on the arm 70 this time ejects. Plate square hole engaging part 33
It comes into contact with a and pushes up the eject plate 33 against the biasing force of the spring 35. FIG. 10 shows this state, and in this embodiment, the movement stroke of the eject pin 71 in 1/4 rotation is set to be equal to the stroke l of the eject plate. When the eject plate 33 is moved to this position, the cartridge 22 is again pushed up vertically to the insertion position by the grooved cams 38a to 38d to the insertion position and ejected, and at the same time, the biasing force of the torsion spring 44 causes the lock lever 40 to move. The eject plate lock pin 41 re-enters the notch 45 and stands still at the position shown in FIG.
When driving 67 rotates 1/4 turn clockwise from the origin position by the drive motor and the cartridge eject operation is completed, at that time it rotates counterclockwise and returns to the origin position by the slit 72a of the origin detection plate 72. , All return to the start state shown in FIG.

FIG. 11 is a block diagram of a drive motor control for controlling the movement of the magnetic bias and the series of eject operations. In FIG. 11, reference numeral 101 is a control circuit for a driving motor 63, which is a step motor, and outputs signals for forward and reverse rotation of the driving motor 63. Reference numeral 102 denotes a drive circuit for the drive motor 63, which performs distribution and amplification according to the excitation drive system of the drive motor 63 in accordance with a signal issued from the control circuit 101. After the cartridge 22 is inserted, a signal is sent from the control circuit 101 in conjunction with the position of the head 28 to move the magnetic bias 50. At this time, the drive motor 63 performs forward and reverse rotation to move the magnetic bias 50 at the position where the origin detection slit 72a rotates counterclockwise from the position of the photo sensor 73. Next, when ejecting the cartridge 22, the drive motor 63 rotates until the slit 72 comes to the position of the photo sensor 73, and the signal of the photo sensor 73 is controlled by the control circuit.
A signal is sent to the driving motor 63 so that the slit 72a rotates clockwise to a predetermined position for the eject after the 101 receives. After that, the drive motor 63 rotates until the slit 72a reaches the position of the photo sensor 73, and waits until the cartridge 22 is inserted.

FIG. 12 is a conceptual diagram of the second embodiment of the magneto-optical disk of the present invention. The specific structure is almost the same as that of the first embodiment, but there is a difference in the magnitude of the magnetic bias and its moving method. . That is, in the second embodiment, the yoke length of the magnetic bias 50 is set to be shorter than that of the first embodiment, and the magnetic bias with respect to the access operation of the head 28 is increased.
Reference numeral 50 also uses the drive motor 63 to perform an access operation independently of the head 28. However, the yoke length can be freely selected, and the shorter the yoke length is, the more frequently the magnetic bias access operation is performed.
Since the magnetic bias is lightened, the access speed is increased, and heat generation due to energization is also suppressed. Further, if the magnetic bias becomes smaller, the storage space for the magnetic bias in the apparatus becomes smaller, and there is an advantage that the apparatus is further downsized especially in the depth dimension. On the other hand, if the frequency of magnetic bias access operations is to be reduced, the yoke length should be set to 1/3 or 1/2 of the disk recording portion length.In this case, the magnetic bias access time is longer than that of the former. However, the access control of the half-face magnetic bias becomes easy and the depth dimension of the device can be reduced as compared with the first embodiment. Further, in the present embodiment, the driving motor for access operation of the magnetic bias is a stepping motor, and the access position is controlled by the number of steps, but it is controlled by a DC motor using a potentiometer or the like as a position sensor. The purpose can be easily achieved even by means of going.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to reduce the thickness of the device by keeping the magnetic bias, which is indispensable for the magneto-optical disk device, outside the space for loading and ejecting the cartridge in the device. Further, by using the ejecting motor of the apparatus for moving the magnetic bias to a position facing the head, a very simple and inexpensive magneto-optical disk apparatus can be provided without requiring a special scooter.

Further, according to the second aspect of the present invention, by operating the magnetic bias corresponding to the head access operation,
The magnetic bias can be downsized, and the device can be downsized.

[Brief description of drawings]

1 is an external perspective view of an embodiment of the present invention, FIGS. 2 and 3 are exploded perspective views thereof, FIG. 4 is a side view of the same starting state, and FIG. 5 is a plan view of FIG. 6 is a plan view showing a state in which the cartridge is inserted into the apparatus, FIG. 7 is a plan view showing a state in which the disc is loaded, FIG. 8 is a side view in FIG. 7, and FIG.
Fig. 10 is a plan view showing a state in which the magnetic bias is moved onto the disk, Fig. 10 is a plan view in the ejected state of the disk, and Fig. 11 is a block diagram for performing drive motor control.
FIG. 12 is a diagram showing a second embodiment of the present invention, and FIGS. 13, 14 and 15 are diagrams showing a conventional embodiment. 20 …… disc, 22 …… cartridge, 24 …… disc motor, 28 …… head, 30 …… housing, 33 …… ejection plate, 38a to 38d …… groove cam, 50 …… magnetic bias,
55 ... Guide member, 57 ... Magnetic bias drive lever, 63
...... Driving motor, 69 …… Drive pin, 71 …… Eject pin.

Claims (2)

(57) [Claims] 1. A cartridge for accommodating a disk, a disk motor for rotating the disk, a head for reading or erasing information, and a magnetic bias for facing the head and applying a magnetic field to the disk. , A mechanism for loading and ejecting the disc and a drive motor for the mechanism,
A magnetic bias slide mechanism is provided so that the magnetic bias is slidable at a position facing the head, and the magnetic bias is slid by the drive motor after a disk is loaded by the drive motor. Magneto-optical disk device. 2. A cartridge for accommodating a disk, a disk motor for rotating the disk, a head for reading or erasing information, and a magnetic bias provided facing the head for applying a magnetic field to the disk. , A mechanism for loading and ejecting the disc and a drive motor for the mechanism,
The magnetic bias is slidably arranged at a position facing the head, the magnetic bias corresponds to an access operation of the head, and the magnetic bias is provided at a position facing the head independently of the head. A magneto-optical disk device, wherein the drive motor is driven by the drive motor.