JPH0773530A - Disk drive device - Google Patents

Abstract

PURPOSE:To detect whether a magnetic field impressing head is positioned at the loading place or not by providing a means for detecting the position of magnetic field impressing head which detects whether the magnetic field impressing head is positioned at the loading place. CONSTITUTION:The means 4 for detecting the position of magnetic field impressing head is constituted of a reflection type photosensor 5 provided on a casing of the disk drive device and a mirror 6 provided on a head arm (flecture) 29 of the magnetic field impressing head 21. Then, the detection whether the head 21 is positioned at the loading place or not, is attained by the reflected amounts of the light to the photosensor 5 from the mirror 6 in both cases the head 21 is positioned at the loading place and at the unloading place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an external magnetic field generator for applying an external magnetic field to a magneto-optical disk as a recording medium, and a magnetic field applying head of the external magnetic field generator applies an external magnetic field to the magneto-optical disk. However, the present invention relates to a disk drive device capable of writing an information signal to the magneto-optical disk, that is, so-called overwriting. Particularly, even when the magnetic field applying head is at the loading position, the magneto-optical disk is loaded. It is possible to eliminate the possibility of damaging the magnetic field applying head and the magneto-optical disk as much as possible.

[0002]

2. Description of the Related Art There is known a disk drive device (magneto-optical disk drive device) capable of both writing and reading an information signal on a magneto-optical disk.

The above-mentioned disk drive device has a cartridge holder for loading and unloading the disk cartridge by inserting the disk cartridge, a disk rotation drive mechanism for rotating a magneto-optical disk in the disk cartridge, and the disk. In addition to various mechanisms for reading information signals from a magneto-optical disk such as an optical pickup device that moves in the radial direction of the magneto-optical disk rotated by a rotation drive mechanism, writing of an information signal to the magneto-optical disk is performed. An external magnetic field generator for applying an external magnetic field when the magnetic field is applied and a head loading mechanism for loading and unloading the magnetic field applying head of the external magnetic field generator are provided.

Then, the reading of the information signal from the magneto-optical disk is performed exclusively by using the optical pickup device.

To write an information signal on a magneto-optical disk, the magnetic field applying head of the external magnetic field generator is loaded by the head loading mechanism, that is, brought into contact with the signal recording surface of the magneto-optical disk, and the magnetic field applying head magneto-optically. This is performed by irradiating the magneto-optical disk with laser light or the like with the above optical pickup device while applying an external magnetic field to the disk.

[0006]

By the way, in the above-mentioned conventional disk drive device, the magnetic field applying head position detection for detecting whether the magnetic field applying head is at the loading position or the unloading position. No means were provided.

Therefore, there is a problem that the magneto-optical disk is inserted (loaded) and the magnetic field applying head is damaged by the magneto-optical disk even though the magnetic field applying head is at the loading position. It was

The present invention has been made for the purpose of solving the above conventional problems.

[0009]

According to a first aspect of the present invention, there is provided an external magnetic field generator for applying an external magnetic field when writing an information signal to a magneto-optical disk as a recording medium, and the external magnetic field generator. In the disk drive device having the head loading mechanism for loading and unloading the magnetic field applying head, the magnetic field applying head position detecting means for detecting whether or not the magnetic field applying head is at the loading position is provided.

According to a second aspect of the present invention, in the disk drive device according to the first aspect, the magnetic field applying head position detecting means comprises:
A photo sensor and a mirror that reflects the light from the photo sensor are included. The photo sensor is attached to the housing of the disk drive device, and the mirror is attached to the head arm supporting the magnetic field applying head.

According to a third aspect of the present invention, in the disk drive device according to the first aspect, the magnetic field applying head position detecting means comprises:
A photo sensor and a mirror for reflecting the light from the photo sensor were used. The photo sensor was attached to the chassis of the disk drive device, and the mirror was attached to the head loading mechanism.

[0012]

According to the disk drive device of claim 1,
The magnetic field applying head position detecting means detects whether or not the magnetic field applying head is at the loading position.

According to another aspect of the disk drive device of the present invention, the movement of the head arm supporting the magnetic field applying head is detected by the magnetic field applying head position detecting means.

In the disk drive apparatus of the third aspect, the movement of the head loading mechanism is detected by the magnetic field applying head position detecting means.

[0015]

1 is a block diagram of a disk drive device according to the present invention.
This will be described with reference to FIG.

1 to 14 show a first embodiment of the present invention.

FIG. 1 is an exploded perspective view of a main part of a disk drive device.

The disk drive device 1 includes an external magnetic field generator 2 for applying an external magnetic field when an information signal is recorded on a magneto-optical disk 201 as a recording medium.
A head loading mechanism 3 for loading and unloading the magnetic field applying head 21 of the external magnetic field generator 2, and a magnetic field applying head position detecting means 4 for detecting whether or not the magnetic field applying head 21 is in a loading position. Is equipped with.

The magnetic field applying head position detecting means 4 comprises a reflection type photosensor 5 provided in the housing of the disk drive device and a mirror 6 provided in the head arm (flexure) 29 of the magnetic field applying head 21. It is configured.

Whether the magnetic field applying head 21 is in the loading position depends on the amount of light reflected from the mirror 6 to the photosensor 5 when the magnetic field applying head 21 is in the loading position and in the unloading position. It is designed to detect whether or not.

In FIG. 1, 201 is a magneto-optical disk, 202 is a cartridge containing the magneto-optical disk 201, and 203 is a shutter member slidably attached to the cartridge 202. Cartridge 202, shutter member 20
The disk cartridge 204 is constituted by 3.

Next, each component will be described in detail.

First, the external magnetic field generator 2 will be described.

The external magnetic field generator 2 is a magneto-optical disk 2
The signal recording surface 01 has a magnetic field applying head 21 for applying an external magnetic field of a predetermined strength, and the magnetic field applying head 21 is attached to the carriage 23 by a holding mechanism 22.

As shown in FIGS. 7 to 8, the holding mechanism 22 is attached to the rear end of the carriage 23 and has a notch 24 on one side edge thereof. The holding plate is made of a magnetic material such as iron. 25 and the notch 2 provided above the holding plate 25 and rotatably held at the rear end of the carriage 23 via a rising portion 23a.
A lifter 27 for holding the magnet 26 facing the inside of
The head arm 29 is provided above the lifter 27 and is elastically held by the rising portion 23a of the carriage 23 and holds a slider 28 incorporating the magnetic field applying head 21.
1 can be held in the loading state and the unloading state.

The lifter 27 of the holding mechanism 22 has a base piece 31 having a pivot pin 30 at its center and a head arm 29 integrally provided at the front edge of the base piece 31.
And an arm supporting portion 32a capable of holding the arm supporting piece 32a having a substantially U-shaped cross section in the front edge thereof, and integrally formed on the rear end edge of the base piece 31 provided behind the arm supporting piece 32. And a driving force receiving portion 33 having an L-shape in plan view, which has a bent portion 33a protruding laterally, and a driving force receiving portion 33 provided below the driving force receiving portion 33 and integrally formed with the base portion 31. 7 and a magnet supporting piece 34 for holding the magnet 26. Of these, the magnet supporting piece 34 is shown in FIG.
As shown in FIG. 8, when the magnetic field applying head 21 is unloaded, it is adsorbed by the notch surface 24a of the notch 24, and as shown in FIG. 8, it is adsorbed by the notch surface 24b during loading (after the magnetic field applying head is loaded). Is configured to.

On the other hand, in the head arm 29, the slider 28 is separated from the signal recording surface of the magneto-optical disk 201 during unloading, as shown in FIG. As shown in FIG. 8, at the time of loading, the slider 28 is moved from a few grams to 1 to the signal recording surface of the magneto-optical disk 201.
It is configured so that it can be pressed by an elastic force of about 0 grams.

Next, the carriage 23 will be described.

As shown in FIGS. 4 to 6, the carriage 23 is movably held on the chassis via two guide shafts 41, 41 which are parallel to each other in the left-right direction at a predetermined interval. ing.

Two pairs of bearings 42 are positioned on one side surface portion of the carriage 23 with their respective bearing rotating shafts being set at an angle of 90 ° with each other, and a pair of bearings 42 on the other side surface portion. The bearings 42 are also positioned with their respective bearing rotation axes set at an angle of 90 ° to each other. It should be noted that the carriage 23 has an elastic body 43 that imparts repulsive force to one of the paired bearings 42 in a direction such that the angle between the bearing rotation axes of each pair is smaller than 90 °. (See FIG. 6) is fixed.

Linear motors 44 for driving the carriage are provided on both sides of the carriage 23.

The linear motor 40 has a frame-shaped coil 45 projecting to both sides of the carriage 23, and a center yoke 46 opposed to each other via a part of the coil 45.
It is composed of a magnet 47 and a lower yoke 48.

Further, the carriage 23 is provided with a lens holder 52 holding the objective lens 51 via two elastic bodies 53 arranged in parallel in the vertical direction.

The lens holder 52 has a magnetic circuit 54.
Is configured so that it can be displaced in the focus direction.

The magnetic circuit 54 includes the objective lens 51.
Frame-shaped coil 55 protruding to both sides of the
It is composed of a center yoke 56, a magnet 57, and a side yoke 58 that face each other with a part of them interposed therebetween.

Further, the carriage 23 has a fixed optical system 6 of an optical pickup device 114, which will be described later.
In order to guide the light beam from the objective lens 51 to the objective lens 51, the beam passage hole 23b is provided as shown in FIG. 7A, and the raising mirror 62 located directly below the objective lens 51 is fixed. .

Next, the head loading mechanism 3 will be described.

As shown in FIG. 9, the head loading mechanism 3 includes a base 73 having two side walls 71, 71 facing each other and a bottom plate 72 interposed between the side walls 71, 71, and the base 73. A pivotably supported first plate 74, a second plate 75 which can be swung by pressing the first plate 74, and a second plate 75 which is predetermined by pressing the first plate 74. The self-holding type electromagnetic clutch 76 which can be held at the position in the swing direction and the first plate 74 are swung, and the slide plate 121 of the elevating mechanism 113 described later is slid to eject the disc cartridge 204. A drive motor 77 (see FIG. 12) for moving the carriage 23, and a direction which is connected to the drive motor 77 and is perpendicular to the forward / backward direction of the carriage 23. And a transmission gear 79 and having a cylindrical pin 78 projecting on the periphery of one side.

In the bottom plate 72 of the base 73, two spring locking holes 81, 82 are formed on both the front and back sides at the end opposite to the motor and are arranged in parallel with each other at a predetermined interval.
Further, a stopper 83 protruding upward is provided in the vicinity of the spring locking hole 82 on the substantially central side of the spring locking holes 81 and 82.

On both side walls 71, 71 of the base 73,
Shaft holes 71a, 71a are provided above the front end surface of the stopper 83 for supporting a holding shaft 84 extending in the advancing / retreating direction of the carriage 23.

Further, two rising walls 85, 85, which are opposed to each other at a predetermined interval in the extending direction of the holding shaft 84, are provided on both side edges of the first plate 74, and these rising walls are provided. Insertion holes 85a, 85a into which the holding shaft 84 is loosely fitted are provided in the parts 85, 85, respectively.

A plate pressing portion 86a projecting in the backward direction of the carriage 23 and a lifter pressing projecting in a direction perpendicular to the projecting direction of the plate pressing portion 86a are provided at the end edge corners of the first plate 74 opposite to the motor side. A pressing piece 86 having a portion 86b is integrally provided.

A spring locking hole 87 corresponding to the spring locking hole 82 is provided in the central portion of the edge of the first plate 74 opposite to the motor side.

The first plate 74 is urged by a tension spring 88 in a direction in which the plate pressing portion 86a abuts on the stopper 83. In addition,
Both ends of the tension spring 88 are locked in the spring locking hole 82 and the spring locking hole 87, respectively.

On the other hand, on the second plate 75, holding walls 89, 89 interposed between the side walls 71, 71 and the rising walls 85, 85 and comb teeth 91a corresponding to the moving range of the carriage 23 are provided. A bent piece 91 is provided at the tip of the bent piece 91.

Further, the second plate 75 is provided with a spring locking hole 92 corresponding to the spring locking hole 81.

Both holding walls 89, 8 of the second plate 75
9 has an insertion hole 93 into which the holding shaft 84 is loosely fitted.

Further, both holding walls 8 of the second plate 75 are
A pin hole 94 that opens in the same direction as the opening direction of the insertion hole 93 is formed in the holding wall on the carriage retreat side of 9, 89.
Further, a protrusion 95 corresponding to the plate pressing portion 86a is provided.

The second plate 75 is urged by the tension spring 96 in the direction in which the comb tooth 91a meshes with the driving force receiving portion 33 of the lifter 27. Both ends of the tension spring 96 are locked in the spring locking hole 81 and the spring locking hole 92, respectively.

Further, a holding arm 98 is rotatably provided on the second plate 75 with a recess 97, which one end of the holding shaft 84 faces, as a pivotal support.

The holding arm 98 has two long and short arm portions 9
It is formed by an arm composed of 8a and 98b.
The carriage 23 is attached to the long arm 98a.
Is integrally provided with a holding portion 99 protruding rearward of
A magnetic piece 100, such as iron, which can be attracted to the electromagnetic clutch 76 is rotatably provided on the tip end surface of the holding portion 99. In addition, the magnetic piece 100 is used as the stopper 10.
The rotation is regulated by 1. On the other hand, the short arm 9
8b is provided with a pin 102 which is inserted into the pin hole 94.

The electromagnetic clutch 76 has a screw 1 on the rear side wall of the side walls 71, 71 of the base 73.
The second plate 7 is attached by
The comb teeth 91a of No. 5 correspond to the driving force receiving portion 33 of the lifter 27
The magnetic piece 100 is configured to be attracted at a position separated from.

Next, the magnetic field applying head position detecting means 4 will be described.

The magnetic field applying head position detecting means 4 is provided with the reflection type photo sensor 5 and the mirror 6 as described above.

As shown in FIGS. 1 and 4, the photosensor 5 is located above the end of the head arm 28 on the tip side where the magnetic field applying head 21 is attached.
Further, when the magnetic field applying head 21 is in the unloading position, it is attached to the housing 132 of the disk drive device via a sensor support member at a position where it does not contact the head arm 28.

On the other hand, the mirror 6 is attached to the upper surface of the end portion of the head arm 28 facing the photosensor 5 on the tip side.

Then, whether or not the magnetic field applying head 21 is in the loading state is detected by the amount of light reflected from the mirror 6 toward the photo sensor 5.

In FIG. 1, 111 is a cartridge holder, 112 is a disk rotation drive mechanism for rotating the magneto-optical disk 201, 113 is an elevating mechanism for moving the disk rotation drive mechanism 112 up and down with respect to the cartridge holder 111, Reference numeral 114 is an optical pickup device.

The cartridge holder 11 has an auto-injection mechanism 115 for automatically pulling the disc cartridge 204 to a predetermined mounting position and a shutter opening mechanism 116 for automatically opening the shutter member 203 of the disc cartridge 204.

The disk rotation drive mechanism 112 comprises a spindle motor 117, a disk table 118 rotated by the spindle motor 117, and a chucking magnet 119 mounted in the recess of the disk table 118. There is.

The elevating mechanism 113 includes an elevating plate 120 provided with the disk rotation drive mechanism 112, and the elevating plate 12
And a slide plate 121 for raising and lowering 0.

The optical pickup device 114 is constructed so that the signal recording surface of the magneto-optical disk 201 can be irradiated with laser light. Unlike the conventional integrated optical system, the optical pickup device 114 is a separation optical system in which the movable part has a light weight in order to cope with high-speed access.

That is, the above optical pickup device 11
Reference numeral 4 denotes a fixed optical system 61 having a laser diode as a light source used for recording and reproduction, a signal detector used for performing focus and tracking control, a signal detector for detecting a recording signal, and the like, as shown in FIG. , This fixed optical system 6
The objective lens 51 for condensing the light beam from the optical disc 1 onto the signal recording surface of the magneto-optical disc 201, and the galvanometer mirror 122 located behind the carriage and used for performing tracking control.

In this separation optical system, the galvano mirror 122 is used as the central angle, and the carriage 23 and the fixed optical system 61 are used as the both ends thereof.
It is arranged at the letter position.

The galvanometer mirror 122 includes the fixed optical system 61 and the fixed optical system 61 of the carriage 23.
The light beam emitted from the optical system is reflected, the reflected light beam is guided to the optical system of the carriage 23, and tracking control is performed by changing the angle of the mirror reflecting surface.

As shown in FIG. 2, the disk drive device having the above-described structure has a chassis 1 having a substantially U-shaped cross section.
A housing 132 which has the disk cartridge 2043 and which incorporates the above-mentioned various mechanisms for performing recording and reproduction on the magneto-optical disk 201, and a housing 132 provided on the front surface of the housing 132, for example, when incorporated in a computer main body, a subsystem or the like. It is composed of a front panel 133 exposed to the outside.

Of these, the front panel 133 is provided with a cartridge insertion / extraction opening 134 for inserting / extracting the disk cartridge 204 into / out of the housing 132, and a dust intrusion prevention lid for opening / closing the cartridge insertion / extraction opening 134. A body 135 is rotatably attached.

Further, the front panel 133 is provided with a light emitting element 136 for displaying a recording / reproducing operation state for the magneto-optical disc 201 and an eject button 137 for ejecting the disc cartridge 203.

Next, the head loading operation by the head loading mechanism 3 will be described.

Cartridge insertion / removal opening 1 on front panel 133
When the disc cartridge 204 is inserted from 34 into the housing 132, the disc cartridge 204 is inserted by the auto-injection mechanism 115 of the cartridge holder 111.
To the cartridge mounting position, and loading of the disk cartridge 204 is completed.

At this time, the disk table 118 is raised to a predetermined position by the elevating mechanism 113, and the magneto-optical disk 201 is attracted and held on the disk table 118 by the chucking magnet 119.

At this time, as shown in FIG. 12, the comb teeth 9 of the bent piece 91 are made by the elastic force of the tension spring 96.
The second plate 75 is positioned at the position where the bent portion 33a of the driving force receiving portion 33 is engaged with the first plate 75, as shown by the solid line in FIG.

Then, as shown in FIG.
Is separated from the magneto-optical disc 201, the magnet 26 of the holding mechanism 22 is adsorbed and held by the notch surface 24a.

The transmission gear 79 is driven by the drive motor 77.
As shown in FIG. 14, a rotational force in the anti-eject direction (O / W head load direction) R ₂ toward the position b is applied until the pin 78 is displaced from the position a to the predetermined rotation position.

At this time, the first plate 74 at the position shown by the solid line in FIG.
By the pressing of 8, the tension spring 88 swings counterclockwise against the elastic force of the tension spring 88, and the first plate 74
The second plate 75 swings in the same direction against the elastic force of the tension spring 96 as shown by the dashed line in FIG. By the swing of the second plate 75, the holding arm 9
The magnetic pieces 100 are attracted to the electromagnetic clutch 76 (which does not need to be energized) in association with each other.

As a result, the second plate 75 is positioned at a position where the bent portion 33a of the driving force receiving portion 33 and the comb tooth 91a of the bent piece 91 are separated from each other, as shown in FIG. The rotation of the transmission gear 79 is stopped by a rotation angle detection switch (not shown).

After the drive motor is reversed by switching the changeover switch (not shown), a rotational force (reversal force) in the eject direction R ₁ is applied to the transmission gear 79 until the pin 78 is displaced from the position b to the position a. The drive motor 77 is stopped.

At this time, as shown by the solid line in FIG. 11, the elastic force of the tension spring 96 causes the first plate 74 to swing clockwise and contact the stopper 83.

ROM by detection switch (not shown)
A disk or a RAM disk (partial ROM disk) is detected, and if it is a ROM disk, the spindle motor 117 is rotated to perform focus-in, and then a normal read sequence is performed.

On the other hand, when a RAM disk (partial ROM disk) is detected by the detection switch (not shown), the loading operation of the magnetic field applying head 21 is performed on the magneto-optical disk 201 as follows.

By energizing the coil 45 of the linear motor 44, a moving force to the outermost periphery of the magneto-optical disk 201 is applied to the carriage 23.

The drive motor 77 applies a rotational force in the anti-eject direction R _{2 to} the transmission gear 79 until the pin 78 is displaced from the position a to the position b as shown in FIG.

At this time, the pin 78 is pressed by the rotation of the transmission gear 79, so that the first plate 74 swings counterclockwise against the elastic force of the tension spring 88 as shown in FIG.

As a result, the lifter 27 is rotated by the pressing of the lifter pressing portion 86b against the driving force receiving piece 33, and the slider 28 is seated (loaded) on the magneto-optical disk 201, and then the arm supporting piece 32 is supported. Part 32a
The head arm 29 is separated from. At this time, the magnet 26 is released from the attracted state with the notch surface 24a and is attracted and held by the notch surface 24b.

By switching a changeover switch (not shown), the drive motor 77 is reversed and the transmission gear 79 is pinned to the pin 7.
Eject direction R until 8 is displaced from position b to position a
_The drive motor 77 is stopped after applying the rotational force (reversal force) of ₁ .

In this way, the loading operation of the magnetic field applying head 21 is performed.

The end of the loading operation of the magnetic field applying head 21 is detected by the magnetic field applying head position detecting means 4.

After that, the spindle motor 117 is rotated, and a normal read / write sequence is performed after focus-in.

Next, the unloading operation of the magnetic field applying head 21 with respect to the magneto-optical disk 201 will be described.

The spindle motor 117 is stopped by an eject command from the host computer or the like.

When the release pulse voltage is applied to the electromagnetic clutch 76, the attracting piece 100 is separated from the electromagnetic clutch 76, and the holding arm 98 and the second plate 75 are moved by the elastic force of the tension spring 96 as shown by the solid line in FIG. Rotate integrally in the clockwise direction.

At this time, as shown in FIG.
The second plate 75 is positioned at a position where the comb teeth 91a of the above and the bent portion 33a of the driving force receiving portion 33 are engaged, as shown by the solid line in FIG.

As a result, as shown in FIG. 7, the lifter 27
Rotates clockwise, the magnet 26 of the holding mechanism 22 releases the attraction state with the cutout surface 24b, and the cutout surface 24a.
And the arm supporting portion 3 of the arm supporting piece 32.
2a pushes up the head arm 29, and the slider 28 or the magnetic application head 21 is separated from the magneto-optical disk 201.

The drive motor 77 applies a rotational force in the eject direction R _{1 to} the transmission gear 79 until the pin 71 is displaced from the position a to the position b as shown in FIG.

At this time, the rotation of the transmission gear 79 pushes the pin 78 against the slide plate return piece 141 (see FIG. 1) to move the slide plate 121 from the loading position to the unloading position against the elastic force of the tension spring 142. Pull back.

Then, the raising / lowering plate 120 is lowered by the pulling back operation of the slide plate 121, and the disc cartridge 204 is inserted / removed by the auto-injection mechanism 115 of the cartridge holder 111.
Is discharged to the outside of the housing 132.

By switching a changeover switch (not shown), the drive motor 77 is reversed and the transmission gear 79 is pinned to the pin 7
Drive motor 77 after applying a rotational force (reversing force) in the anti-eject direction R ₂ until 8 is displaced from position b to position a.
To stop.

In this way, the unloading operation is performed, and the disk cartridge 204 waits for insertion again.

When the magnetic field applying head 21 in the unloading state becomes the unloading state for some reason, the magnetic field applying head position detecting means 4 detects it.

Therefore, when the magnetic field applying head 21 is in the loading state, the disk cartridge 204 is erroneously
It is possible to prevent the damage of the magnetic field applying head 21 by inserting.

The magnetic field applying head position detecting means 4 is used.
When the loading state of the magnetic field applying head 21 is detected, it is displayed on the front panel 133 of the housing 132 by a light emitting element or the like, or the front panel 1
A lid 135 for opening and closing the cartridge insertion / extraction opening 134 of 33
May be locked so that the disc cartridge 203 cannot be inserted.

15 to 16 show a second embodiment of the present invention.

In this embodiment, the reflection type photo sensor 5 as the magnetic field applying head position detecting means 4 is attached in the vicinity of the electromagnetic clutch 76 of the chassis while the mirror 6 is provided.
Was attached in the vicinity of the magnetic piece 100 of the support arm 98 of the head loading mechanism 3 facing the photo sensor 5.

When the head loading mechanism 3 loads and unloads the magnetic field applying head 21, the support arm 98 rotates,
The magnetic field applying head 2 is detected by detecting the rotation of the support arm 98.
It is adapted to detect whether 1 is in a loading state or an unloading state.

Since the other components are the same as those in the first embodiment, the same components are designated by the same reference numerals and the duplicate description will be omitted.

17 to 18 show a third embodiment of the present invention.

In this embodiment, the magnetic field applying head position detecting means 4 is a transmission type (light shielding type) photo sensor 15.
1 and a light shielding plate 152.

The photo sensor 151 is attached to the chassis side.

The light shielding plate 152 is attached to the lower surface of the second plate 75 of the head loading mechanism 3.

When the magnetic field applying head 21 is set to the loading state by the head loading mechanism 3, as shown in FIG. 17, the light shielding plate 152 causes the light emitting portion 153 and the light receiving portion 15 of the transmissive photosensor 151.
It is designed to detect that the magnetic field applying head 21 is in a loading state by penetrating into the concave portion 155 between 4 and blocking the light from the light emitting portion 153.

Since the other components are the same as those in the first embodiment, the same components are designated by the same reference numerals and the duplicate description will be omitted.

19 to 20 show a fourth embodiment of the present invention.

In this embodiment, the magnetic field applying head position detecting means 4 is composed of a limit switch 161 and a switch pressing member 162.

The limit switch 161 includes the housing 13
It is attached to the 2 side.

The switch pressing member 162 has a shorter arm portion 98 of the support arm 98 of the head loading mechanism 3.
It is provided on the upper surface on the b side.

Then, when the support arm 98 is rotated when the magnetic field applying head 21 is loaded and unloaded by the head loading mechanism 3, the limit switch 1 is moved by the switch pressing member 162.
By pressing 61, it is detected whether the magnetic field applying head 21 is in a loading state.

Since the other components are the same as those in the first embodiment, the same components are designated by the same reference numerals and the duplicate description will be omitted.

[0118]

The disk drive device of the present invention has the following effects.

(1) In the disk drive device of the first aspect, the magnetic field applying head position detecting means can detect whether or not the magnetic field applying head is at the loading position.

Therefore, when the magnetic field applying head is at the loading position, the magnetic field applying head is returned to the unloading position to load the disk, so that the magnetic field applying head is at the loading position to load the disk to operate the magnetic field applying head. It is possible to prevent the damage.

(2) In the disk drive device according to the second aspect, it is directly detected by the magnetic field applying head position detecting means whether or not the magnetic field applying head attached to the head arm is at the loading position. can do.

(3) In the disk drive device according to the third aspect, whether or not the magnetic field applying head is at the loading position can be indirectly detected by the magnetic field applying head position detecting means via the head loading mechanism. it can.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts of a first embodiment of the present invention.

FIG. 2 is a perspective view showing the external appearance of a disk drive device.

FIG. 3 is a cross-sectional view showing the internal structure of the disk drive device.

FIG. 4 is a perspective view showing a carriage portion.

FIG. 5 is an exploded perspective view showing a lens holder portion.

6 is a cross-sectional view of the main part of FIG.

7A and 7B are a side view and an X arrow view thereof for explaining an unloading state of the magnetic field applying head.

8A and 8B are a side view and a Y arrow view thereof for explaining a loading state of the magnetic field applying head.

FIG. 9 is an exploded perspective view of a head loading mechanism.

FIG. 10 is a perspective view of a head loading mechanism.

FIG. 11 is a front view showing an operating state of the head loading mechanism.

FIG. 12 is a perspective view showing a shipping lock state of the carriage.

FIG. 13 is a perspective view showing a shipping lock released state of the carriage.

FIG. 14 is a side view showing a transmission gear (a Z arrow view in FIG. 13).

FIG. 15 is a perspective view of a main part in a head unloading state of the second embodiment.

FIG. 16 is a perspective view of an essential part in a head loading state of the second embodiment.

FIG. 17 is a perspective view of a main part in a head unloading state of the third embodiment.

FIG. 18 is a perspective view of an essential part in a head loading state of the third embodiment.

FIG. 19 is a perspective view of a main part in a head unloading state of the fourth embodiment.

FIG. 20 is a perspective view of a main part in a head loading state of a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disk drive device 2 ... External magnetic field generator 3 ... Head loading mechanism 4 ... Magnetic field application head position detection means 5 ... Photo sensor 6 ... Mirror 21 ... Magnetic field application head 22 ... Head arm 131 ... Disk drive device chassis 132 ... Disk Drive device housing 201 ... Magneto-optical disk

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshikatsu Niwa 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (3)

[Claims] 1. An external magnetic field generator for applying an external magnetic field when writing an information signal to a disk as a recording medium, and a head loading for loading and unloading a magnetic field applying head of the external magnetic field generator. A disk drive device including a mechanism, further comprising magnetic field applying head position detecting means for detecting whether or not the magnetic field applying head is at a loading position. 2. The magnetic field applying head position detecting means according to claim 1, comprising a photo sensor and a mirror for reflecting light from the photo sensor, the photo sensor being provided in a housing of a disk drive device. The disk drive device in which the mirror is provided on the head arm that supports the magnetic field applying head. 3. The magnetic field applying head position detecting means according to claim 1, comprising a photosensor and a mirror for reflecting light from the photosensor, wherein the photosensor is provided on a chassis of the disk drive device. The mirror is a disk drive device provided in the head loading mechanism.