JP3341380B2 - Disk drive device - Google Patents

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 applies an external magnetic field to the magneto-optical disk with a magnetic field applying head of the external magnetic field generator. However, with respect to a disk drive device capable of writing an information signal to the magneto-optical disk, that is, so-called overwriting, particularly loading the magneto-optical disk even though the magnetic field applying head is at the loading position, It is possible to minimize the possibility of damaging the magnetic field applying head and the magneto-optical disk.

[0002]

2. Description of the Related Art There has been known a disk drive (magneto-optical disk drive) capable of performing both writing and reading of an information signal with respect to a magneto-optical disk.

[0003] The disk drive device includes a cartridge holder for loading and unloading the disk cartridge by inserting the disk cartridge, a disk rotation driving mechanism for rotating a magneto-optical disk in the disk cartridge, and a disk rotation drive mechanism. 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 the rotation drive mechanism, the information signal is written to the magneto-optical disk. An external magnetic field generator that applies an external magnetic field when performing the operation, and a head loading mechanism that loads and unloads a magnetic field application head of the external magnetic field generator.

[0004] Reading of the information signal from the magneto-optical disk is performed exclusively using an optical pickup device.

The writing of information signals to the magneto-optical disk is performed by loading the magnetic field applying head of the external magnetic field generating device by the above-described head loading mechanism, that is, by arranging the head at a small constant interval on the signal recording surface of the magneto-optical disk.
The optical pickup device irradiates the magneto-optical disk with laser light or the like while applying an external magnetic field to the magneto-optical disk with the magnetic field applying head.

[0006]

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

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

The present invention has been made to solve the above-mentioned conventional problems.

[0009]

A first aspect of the present invention is a disk drive.
Information device to a disc as a recording medium.
When writing a signal, use a magnetic field
Magnetic field generator having a magnetic field, and the above-described external magnetic field generator
Writes information signal to disk with magnetic field applying head
The loading position where the
Head loading that moves up and down to the loading position
Loading mechanism and the magnetic field applying head are in the loading position
Magnetic field application with photosensor to detect if
And a head position detecting means .

According to a second aspect of the present invention, in the disk drive device of the first aspect, the magnetic field application head position detecting means includes :
And the photosensor, comprise a mirror for reflecting light from the photo sensor, the photo sensor is mounted in a housing of the disk drive unit, a mirror is attached to a head arm supporting the magnetic field application head And
You .

According to a third aspect of the present invention, in the disk drive device of the first aspect, the magnetic field applying head position detecting means includes :
And the photosensor, comprise a mirror for reflecting light from the photo sensor, the photo sensor is mounted on the chassis of the disk drive unit, a mirror is attached to the head loading mechanism.

[0012]

According to the disk drive device of the first aspect,
Magnetic field applying head having magnetic field applying head position detecting means ;
Since the position detecting means is provided with the photo sensor, it is detected whether the magnetic field applying head is at the loading position.

According to a second aspect of the present invention, the movement of the head arm supporting the magnetic field applying head is controlled by a photo sensor as a magnetic field applying head position detecting means.
And is detected by the mirror .

According to the third aspect of the present invention, the movement of the head loading mechanism is detected by the photo sensor and the mirror as the magnetic field applying head position detecting means.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
This will be described with reference to FIG.

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

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

The disk drive 1 includes an external magnetic field generator 2 for applying an external magnetic field when recording an information signal 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, a magnetic field applying head position detecting means 4 for detecting whether the magnetic field applying head 21 is at a loading position, It has.

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

Whether the magnetic field applying head 21 is at 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 at the loading position and when the magnetic field applying head 21 is at the unloading position. Is detected.

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 mounted on the cartridge 202. Cartridge 202, shutter member 20
3 constitutes the disk cartridge 204.

Next, each component will be described in detail.

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

The external magnetic field generator 2 includes a magneto-optical disk 2
The apparatus has a magnetic field applying head 21 for applying an external magnetic field of a predetermined strength to the signal recording surface of No. 01, and the magnetic field applying head 21 is attached to a carriage 23 by a holding mechanism 22.

As shown in FIGS. 7 and 8, the holding mechanism 22 is attached to the rear end of the carriage 23 and has a notch 24 at one side edge thereof. The holding plate 22 is made of a magnetic material such as iron. And a 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 a magnet 26 facing inside 4;
A head arm 29 provided above the lifter 27 and elastically held by the rising portion 23a of the carriage 23 and holding a slider 28 incorporating the magnetic field applying head 21;
1 can be held in a loading state and an unloading state.

The lifter 27 of the holding mechanism 22 has a base piece 31 having a pivot pin 30 at the center thereof and the head arm 29 provided integrally with the front end of the base piece 31.
Arm support portion 32a having a substantially U-shaped section in cross section, having an arm support portion 32a at its front end edge capable of holding the arm member, and an arm support portion 32a provided behind the arm support portion 32 and formed integrally with the rear end edge of the base portion 31. And an L-shaped driving force receiving portion 33 having a bent portion 33a protruding to one side, and provided below the driving force receiving portion 33 and formed integrally with the base portion 31 and The magnet support piece 34 for holding the magnet 26 is shown in FIG.
As shown in FIG. 8, when the magnetic field applying head 21 is unloaded, it is attracted to the notch surface 24a of the notch 24, and as shown in FIG. 8, it is attracted to the notch surface 24b during loading (after loading of the magnetic field applying head). It is configured to:

On the other hand, as shown in FIG. 7, the slider 28 separates from the signal recording surface of the magneto-optical disk 201 during unloading, in order to secure the stability when the head floats. As shown in FIG. 8, at the time of loading, the slider 28 is moved from the signal recording surface of the magneto-optical disk 201 by several grams to 1 gram.
It is configured so that it can be pressed with a repelling force of about 0 g.

Next, the carriage 23 will be described.

As shown in FIGS. 4 to 6, the carriage 23 is held on the chassis via two guide shafts 41, 41 which are parallel to each other at a predetermined interval in the left-right direction so as to be able to move forward and backward. ing.

On one side surface of the carriage 23, two pairs of bearings 42 are positioned by setting the rotation axes of the respective bearings at an angle of 90 ° to each other. The bearings 42 are similarly positioned with their bearing rotation axes set at an angle of 90 ° to one another. In addition, the carriage 23 has an elastic body 43 that imparts a resilient force to one of the bearings 42 of the pair in such a direction that the angle between the rotation shafts of the two bearings is smaller than 90 °. (See FIG. 6) is fixed.

On both sides of the carriage 23, linear motors 44 for driving the carriage are provided.

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

Further, the carriage 23 has a lens holder 52 for holding the objective lens 51 interposed therebetween, with two elastic bodies 53 arranged in parallel in the vertical direction.

The lens holder 52 includes a magnetic circuit 54
, So that it can be displaced in the focus direction.

The magnetic circuit 54 includes the objective lens 51
Frame-shaped coil 55 projecting to both sides of the
5 includes a center yoke 56 opposed to a part of the center yoke 5, a magnet 57 and a side yoke 58.

Further, the fixed optical system 6 of the optical pickup device 114 described later is mounted on the carriage 23.
In order to guide a light beam from 1 to the objective lens 51, a beam passage hole 23b is provided as shown in FIG. 7A, and a rising mirror 62 located immediately 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 has 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 A pivotally supported first plate 74, a second plate 75 that can be swung by pressing the first plate 74, and a second plate 75 that is swung by pressing the first plate 74. The disk cartridge 204 is ejected by swinging the first plate 74 and sliding the slide plate 121 of the lifting mechanism 113 which will be described later. A drive motor 77 (see FIG. 12) for causing the carriage 23 to move in a direction perpendicular to the direction in which the carriage 23 moves forward and backward. And a transmission gear 79 and having a cylindrical pin 78 projecting on the periphery of one side.

The bottom plate 72 of the base 73 has two spring locking holes 81 and 82 which are opened on both front and back surfaces at an end edge on the side opposite to the motor and are respectively arranged in parallel at a predetermined interval.
A stopper 83 is provided which protrudes upward in the vicinity of the spring locking hole 82 substantially at the center of the spring locking holes 81 and 82.

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

Two rising walls 85, 85 are provided on both side edges of the first plate 74 at predetermined intervals in the direction in which the holding shaft 84 extends. 85, 85 are provided with insertion holes 85 a, 85 a into which the holding shaft 84 is loosely fitted.

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

A spring locking hole 87 corresponding to the spring locking hole 82 is provided at the center of the edge of the first plate 74 opposite to the motor.

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

On the other hand, the second plate 75 is provided with 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. , A bent piece 91 provided at the tip thereof.

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

The two holding walls 89, 8 of the second plate 75
9 is provided with an insertion hole 93 into which the holding shaft 84 is loosely fitted.

The two holding walls 8 of the second plate 75
9 and 89, the holding wall on the carriage retreating side has a pin hole 94 that opens in the same direction as the opening direction of the insertion hole 93.
Further, a protrusion 95 corresponding to the plate pressing portion 86a is provided.

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

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

The holding arm 98 has two long and short arms 9.
8a and 98b.
The carriage 23 is attached to the longer arm 98a.
Is integrally provided with a holding portion 99 projecting rearward.
A magnetic piece 100 made of, for example, iron, which can be attracted to the electromagnetic clutch 76, is rotatably provided on the distal end surface of the holding portion 99. Note that this magnetic piece 100 is
1 restricts the rotation. On the other hand, the short arm 9
8b is provided with a pin 102 inserted into the pin hole 94.

The electromagnetic clutch 76 is provided with a screw 1 on the rear side wall of the side walls 71, 71 of the base 73.
03 and the second plate 7
5 is the driving force receiving portion 33 of the lifter 27.
It is configured to adsorb the magnetic piece 100 at a position separated from the magnetic piece 100.

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

The magnetic field applying head position detecting means 4 includes the reflection type photosensor 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 mounted.
When the magnetic field applying head 21 is in the unloading position, the magnetic field applying head 21 is attached to the housing 132 of the disk drive device via a sensor supporting member at a position where the head 21 does not contact the head arm 28.

On the other hand, the mirror 6 is mounted on the upper surface of the distal end of the head arm 28 facing the photosensor 5.

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

In FIG. 1, reference numeral 111 denotes a cartridge holder; 112, a disk rotation drive mechanism for rotating the magneto-optical disk 201; 113, an elevating mechanism for raising and lowering the disk rotation drive mechanism 112 with respect to the cartridge holder 111; Reference numeral 114 denotes an optical pickup device.

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

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

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

The optical pickup device 114 is configured to irradiate the signal recording surface of the magneto-optical disk 201 with laser light. Unlike the conventional integrated optical system, the optical pickup device 114 is a separation optical system in which a movable portion is lightened in order to cope with high-speed access.

That is, the optical pickup device 11
Reference numeral 4 denotes a fixed optical system 61 having a laser diode serving 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
It comprises the objective lens 51 for condensing the light beam from 1 on the signal recording surface of the magneto-optical disk 201, and the galvano mirror 122 located behind the carriage and used for performing tracking control.

In this separation optical system, the galvanomirror 122 is set at the center angle, and the carriage 23 and the fixed optical system 61 are set at both ends.
It is arranged at the position of the letter.

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

As shown in FIG. 2, the disk drive apparatus having the above-described structure has a chassis 1 having a substantially U-shaped cross section.
And a housing 132 containing the above-mentioned various mechanisms for recording and reproducing data on and from the disk cartridge 2043 magneto-optical disk 201, and provided on the front surface of the housing 132, for example, when incorporated in a computer main body or a subsystem or the like. And a front panel 133 exposed to the outside.

The front panel 133 is provided with a cartridge insertion / extraction opening 134 for inserting / detaching the disk cartridge 204 into / from the housing 132. A lid for opening / closing the cartridge insertion / extraction opening 134 is provided for preventing dust from entering. A body 135 is rotatably mounted.

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

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

The cartridge slot 1 of the front panel 133
When the disk cartridge 204 is inserted into the housing 132 from the position 34, the auto-injection mechanism 115 of the cartridge holder 111 causes the disk cartridge 204 to be inserted.
Is automatically drawn into the cartridge mounting position, and the 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 resilient force of the tension spring 96 causes the comb teeth 9 of the bent piece 91 to move.
The second plate 75 is located at a position where the bent portion 33a of the driving force receiving piece 33 engages with the first plate 75 as shown by a solid line in FIG.

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

The transmission gear 79 is driven by the drive motor 77.
The pin 78 as shown in FIG. 14 to impart a rotational force of the position counter eject direction toward a position b to be displaced to a predetermined rotational position from a (O / W head loading direction) R ₂ in.

At this time, the first plate 74 at the position shown by the solid line in FIG.
8, the first plate 74 swings counterclockwise against the elastic force of the tension spring 88.
The second plate 75 swings in the same direction against the resilience of the tension spring 96 as shown by a two-dot chain line in FIG. The swing of the second plate 75 causes the holding arm 9 to move.
8, the magnetic piece 100 is attracted to the electromagnetic clutch 76 (no electricity is required).

As a result, as shown in FIG. 13, the second plate 75 is positioned at a position where the bent portion 33a of the driving force receiving piece 33 and the comb teeth 91a of the bent piece 91 are separated from each other. 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 a changeover switch (not shown), a rotational force (reverse 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 a solid line in FIG. 11, the first plate 74 swings clockwise by the elastic force of the tension spring 96 and comes into contact with the stopper 83.

The detection switch (not shown) controls the ROM
After detecting a disk or a RAM disk (partial ROM disk), if the disk is a ROM disk, a normal read sequence is performed after the spindle motor 117 is rotated to focus in.

On the other hand, when the detection switch (not shown) detects the RAM disk (partial ROM disk), the loading operation of the magnetic field applying head 21 to the magneto-optical disk 201 is performed 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.

[0082] To impart rotational force to the pin 78 as shown in FIG. 14 to the transmission gear 79 by the drive motor 77 is displaced to a position b from the position a counter-ejection direction R _2.

At this time, the pressing of the pin 78 by the rotation of the transmission gear 79 causes the first plate 74 to swing 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 portion 33, and the slider 28 is seated (loaded) on the magneto-optical disk 201. Part 32a
Arm 29 is separated from the head arm 29. At this time, the magnet 26 is released from the attraction state with the notch surface 24a and is attracted and held at the notch surface 24b.

By switching a changeover switch (not shown), the drive motor 77 is inverted and the pin 7 is connected to the transmission gear 79.
Eject direction R until 8 is displaced from position b to position a
_After the rotation force (reversing force) of ₁ is applied, the drive motor 77 is stopped.

Thus, 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.

Thereafter, the spindle motor 117 is rotated, and a normal read / write sequence is performed after focusing.

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 ejection command from a host computer or the like.

When the release pulse voltage is applied to the electromagnetic clutch 76, the attraction piece 100 is separated from the electromagnetic clutch 76, and as shown by the solid line in FIG. Rotate clockwise integrally.

At this time, as shown in FIG.
The second plate 75 is positioned as shown by the solid line in FIG. 11 at a position where the comb teeth 91a of the driving force receiving portion 33 and the bent portion 33a of the driving force receiving portion 33 engage.

As a result, as shown in FIG.
Is rotated clockwise, the magnet 26 of the holding mechanism 22 releases the suction state with the notch surface 24b, and the notch surface 24a
To the arm support portion 32 of the arm support piece 32.
2a pushes up the head arm 29, and the slider 28 to the magnetic application head 21 are separated from the magneto-optical disk 201.

[0094] To impart rotational force of the eject direction R ₁ until the pin 71 as shown in FIG. 14 to the transmission gear 79 by the drive motor 77 is displaced to a position b from the position a.

At this time, the slide plate 121 is moved from the loading position to the unloading position by the pressing of the pin 78 against the slide plate return piece 141 (see FIG. 1) by the rotation of the transmission gear 79, against the elasticity of the tension spring 142. Pull back.

Then, the elevating plate 120 is lowered by the retraction operation of the slide plate 121, and the disk cartridge 204 is inserted into the cartridge slot 134 by the auto-injection mechanism 115 of the cartridge holder 111.
From the housing 132.

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

In this way, the unloading operation is performed, and the system waits for the disk cartridge 204 to be inserted again.

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

Therefore, when the magnetic field applying head 21 is in the loading state, the disk cartridge 204
To prevent the magnetic field applying head 21 from being damaged as much as possible.

The magnetic field applying head position detecting means 4
When detecting the loading state of the magnetic field applying head 21, the detected state may be displayed on the front panel 133 of the housing 132 by a light emitting element or the like, or the front panel 1 may be displayed.
Lid 135 that opens and closes 33 cartridge insertion / extraction opening 134
May be locked so that the disk cartridge 203 cannot be inserted.

FIGS. 15 and 16 show a second embodiment of the present invention.

In this embodiment, the reflection type photosensor 5 as the magnetic field application head position detecting means 4 is mounted near the electromagnetic clutch 76 of the chassis, while the mirror 6 is mounted.
Was mounted near the magnetic piece 100 of the support arm 98 of the head loading mechanism 3 facing the photosensor 5.

When the support arm 98 rotates when the magnetic field applying head 21 is loaded and unloaded by the head loading mechanism 3,
The rotation of the support arm 98 is detected, and the magnetic field applying head 2 is detected.
1 detects whether it is in the loading state or the unloading state.

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

FIGS. 17 and 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 mounted on the chassis.

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 brought into the loading state by the head loading mechanism 3, as shown in FIG. 17, the light shielding plate 152 is connected to the light emitting unit 153 and the light receiving unit 15 of the transmission type photo sensor 151.
4, the light from the light emitting section 153 is blocked, and it is detected that the magnetic field applying head 21 is in the loading state.

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

FIGS. 19 and 20 show a fourth embodiment of the present invention.

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

The limit switch 161 is connected to the housing 13
Mounted on two sides.

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

When loading and unloading the magnetic field applying head 21 by the head loading mechanism 3, when the support arm 98 rotates, the limit switch 1 is pressed by the switch pressing member 162.
By pressing 61, it is detected whether or not 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 denoted by the same reference numerals, and redundant description will be omitted.

[0118]

The disk drive 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 the magnetic field applying head is at the loading position.

Therefore, when the magnetic field applying head is at the loading position, it is returned to the unloading position and the disk is loaded, so that the disk is loaded while the magnetic field applying head is at the loading position and the magnetic field applying head is moved. Such damage can be prevented beforehand.

(2) In the disk drive device according to the second aspect, whether the magnetic field applying head attached to the head arm is at the loading position is directly detected by the magnetic field applying head position detecting means. can do.

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

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a first embodiment of the present invention.

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

FIG. 3 is a 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.

FIG. 6 is a sectional view of a main part of FIG. 4;

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

FIGS. 8A and 8B are a side view for explaining a loading state of a magnetic field application head and a view taken in the direction of an arrow Y. FIG.

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 the operation state of the head loading mechanism.

FIG. 12 is a perspective view showing a shipping locked 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 the transmission gear (as viewed in the direction of arrow Z in FIG. 13).

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

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

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

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

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

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

[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 ... Photosensor 6 ... Mirror 21 ... Magnetic field application head 22 ... Head arm 131 ... Disk drive device chassis 132 ... Disk Drive device housing 201: magneto-optical disk

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshikatsu Niwa 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (56) References JP-A-6-131834 (JP, A) JP-A Heisei 5-282733 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 11/105 G11B 5/02

Claims (3)

(57) [Claims] 1. An external magnetic field generating device having a magnetic field applying head for applying an external magnetic field when writing an information signal to a disk as a recording medium, and a magnetic field applying head of the external magnetic field generating device is paired with the disk.
The loading position where the information signal is written
Up and down movement to the unloading position away from the disc
And a head loading mechanism for moving the magnetic field applying head.
Magnetic field applied head position detection with photo sensor for detection
Disk drive apparatus characterized by being configured with a means. 2. The magnetic field applying head position detecting means according to claim 1, further comprising a mirror for reflecting light from said photosensor, wherein said photosensor is provided on a housing of a disk drive device, Is a disk drive device provided on a head arm supporting a magnetic field applying head. 3. The magnetic field applying head position detecting means according to claim 1, further comprising a mirror for reflecting light from the photo sensor, wherein the photo sensor is provided on a chassis of a disk drive device, and the mirror is , A disk drive device provided in the head loading mechanism.