JP3050735B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device capable of recording or reproducing information on or from a disk as a recording medium, and more particularly, to a cartridge holder for receiving a disk cartridge for rotatably storing a disk. And a disk device movably provided between a recording / reproducing cartridge loading position.

[0002]

2. Description of the Related Art For example, a magneto-optical disk device capable of repeatedly recording information on a magneto-optical disk as an example of a disk as a recording medium is irradiated from an optical head toward a recording layer of a loaded magneto-optical disk. A laser beam having a large power is continuously converged, the temperature is raised to the Curie temperature, and in this temperature rise state, a bias magnetic field is applied by a magnetic head as a bias magnetic field generator,
After aligning the magnetization direction of the magnetic material to the same direction as when initializing,
The bias magnetic field is reversed to intermittently converge a high-power laser beam on the recording layer, whereby the direction of magnetization is reversed to record information.

In the magneto-optical disk device having such a conventional structure, in order to rewrite information of one track, it is necessary to rotate the magneto-optical disk for erasing and recording, respectively, and there is a disadvantage that the recording speed is reduced. . Therefore, recently, information is rewritten only by rotating the magneto-optical disk once by selectively applying a magnetic field of either the S pole or the N pole to a minute area corresponding to the area where the laser beam is converged. A magneto-optical disk device of a magnetic field modulation overwrite type capable of performing the above has been proposed.

[0004]

In such a conventional magneto-optical disk device, a magneto-optical disk used as a recording medium therein is stored in a disk cartridge in advance, and is stored in the disk cartridge. Is set in an extremely strong manner against dust and dirt since the disk is put into and taken out of the magneto-optical disk device in the state described above. However, when the disk cartridge is loaded in the magneto-optical disk device, the shutter of the disk cartridge is opened, and the magneto-optical disk is partially exposed through the shutter opening. For this reason, dust or dust existing in the magneto-optical disk device may adhere to the magneto-optical disk or the built-in optical element through the opened shutter opening, causing a problem. For this reason, it is conceivable to make the housing of the magneto-optical disk device a dust-proof structure. However, with this alone, an opening for inserting and removing the disk cartridge is formed in the housing. Dust can get into the housing and improvements have been sought.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to close an opening for taking a disk cartridge in and out, except when loading or unloading a disk cartridge. The present invention is to provide a disk device capable of completely setting a disk in a dustproof state.

[0006]

DISCLOSURE OF THE INVENTION In order to solve the above-mentioned problems and achieve the object, a disk device according to the present invention comprises:
According to the first aspect of the present invention, an opening is formed on one side for inserting and removing a disk cartridge accommodating a disk as a recording medium, and a housing having a dustproof structure inside except for this opening; A shutter plate housed in the housing and closing the opening so that the opening can be opened; and a shutter plate opening / closing means for opening and closing the shutter plate in response to the insertion / removal of the disk cartridge. Urging means for urging the plate to close the opening from the inside, and a disc inserted into the housing by a predetermined amount while the shutter plate is rotated against the urging force of the urging means. In response to the further insertion of the cartridge, the shutter plate is kept It is characterized by comprising moving means for moving in a direction away from the disk cartridge.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a magneto-optical disk drive to which an embodiment of a disk drive according to the present invention is applied will be described in detail below with reference to the accompanying drawings.

First, a magneto-optical disk drive 10 of this embodiment is a magneto-optical disk drive of a magnetic field modulation overwrite type, and as shown in FIGS. The magneto-optical disk 12 shown in FIGS. 5 and 6 can be automatically loaded (loaded) and automatically ejected (unloaded) while the internal space to be loaded is sealed. In the magneto-optical disk device 10, when rewriting information of one track, a magnetic field of either S or N is selectively applied to a minute area corresponding to an area where laser light is converged. Thus, a so-called magnetic field modulation overwrite method is adopted in which information can be rewritten only by rotating the magneto-optical disk 12 once.

For this reason, a large power is emitted from an optical head 16 described later while applying a modulation magnetic field to a recording layer of the loaded magneto-optical disk 12 by a magnetic head 14 described below as a magnetic field generator. The laser beam is converged continuously, whereby the direction of magnetization is reversed to record (or overwrite) information.
As a result, so-called initial work becomes unnecessary, and high-speed information recording becomes possible.

Next, the external configuration of the magneto-optical disk device 10 will be described with reference to FIGS.

The external appearance of the magneto-optical disk device 10 includes a pair of left and right main frames 18 having a base portion 18a and an upright portion 18b and formed in a substantially L-shaped side surface, and front surfaces of the upright portions 18b of the two main frames 18. A front bezel 22 attached via an attachment mechanism 20 described below,
An optical head mounting base 24 (described in detail later) fixed on the upper surface of the base 18a of both main frames 18, a loading chassis 26 (described in detail later) fixed on the optical head mounting base 24, and An upper cover 28 mounted on the loading chassis 26 and covering the upper surface thereof in a closed state, a rear cover 30 for closing a rear opening formed between the optical base 24 and the loading chassis 26, and a base portion of both main frames 18. 18
A control room rear cover 32 for closing the rear surface of the control room defined from the space sandwiched by a, and a bottom plate (not shown) closing the bottom surface of the control room.
The main frame 18, the loading chassis 26, the upper cover 28, the rear cover 30, and the control room rear cover 32 define a housing constituting the outer surface of the magneto-optical disk device 10.

Here, in order to take the magneto-optical disk 12 into and out of the magneto-optical disk device 10, a bezel opening 34 is formed in the front bezel 22 as shown in FIG. 1, and a loading chassis as shown in FIG. A chassis opening 36 is formed on the front surface of the opening 26 so as to communicate with the bezel opening 34. As described above, the magneto-optical disk 12 is inserted into and removed from the magneto-optical disk device 10 through the bezel opening 34 and the chassis opening 36. still,
The bezel opening 34 and the chassis opening 36 extend in the horizontal direction as shown in the figure, and the magneto-optical disk 12 is inserted in the horizontal direction, that is, the magneto-optical disk 12 is rotated around the vertical axis. Although the disk device 10 is illustrated as being used, in this embodiment, the bezel opening 34 and the chassis opening 36 are not limited to such a use state (or a mounted state). The magneto-optical disk device 10 may be used such that the magneto-optical disk 12 extends in the direction and is rotated around the horizontal axis.

The chassis opening 36 is openably closed via a shutter plate 38 inside the chassis opening 36. Thus, the space surrounded by the optical base 24, the upper cover 28, and the rear cover 30, that is, the space in which the magneto-optical disk 12 is loaded
Except during the loading or unloading operation of No. 2, a completely sealed state will be maintained. In this way, in this embodiment, when reading information from the loaded magneto-optical disk 12 or when writing information to the magneto-optical disk 12, it is possible to avoid the problem of dust and dirt. As a result, more reliable information reading and information writing can be achieved. here,
The above-described control room rear cover 32 is set so that a control board, an interface board, and the like (not shown) are disposed in the control room where the control room is closed. Many holes 32a are formed. The shutter plate 38 is connected to the magneto-optical disk 12 via a shutter plate opening / closing mechanism 40 described later.
The chassis opening 36 is opened in accordance with the loading operation or the unloading operation.

Next, the configuration of the magneto-optical disk 12 used in the magneto-optical disk device 10 of this embodiment will be schematically described with reference to FIGS. The magneto-optical disk 12 includes a disk cartridge 4 having a hollow inside.
2, a disk body 12a having recording layers formed on both upper and lower surfaces (or only one surface), and a spindle motor 44 formed at a central portion of the disk body 12a. And a hub 12b which is driven to rotate by this.

Here, the magneto-optical disk 12 used in the magneto-optical disk device 10 of this embodiment has a double-sided disk capable of storing information on a recording layer formed on each side, and a magnetic-modulation recording system. And a single-sided disk in which a recording layer capable of recording only on one side (A side) is formed. In principle, it is difficult to perform high-density recording on the magneto-optical disk 12 of the double-sided disk type by the magnetic field modulation recording method. The information indicating whether the magneto-optical disk 12 is a double-sided disk from which information can be read only or a single-sided disk from which information can be read / written is stored in an MFZ (manufacturer management area) provided in the outermost peripheral area of the magneto-optical disk 12. ) Can be recorded in advance in the control track.

On the other hand, in the magneto-optical disk device 10 of this embodiment, the magneto-optical disk 12 used has the recording information of ISO
(International) standards or ECMA (Europe)
The rotation speed is set to be different depending on whether the disk has a high capacity according to the standard. As an example, ISO
When reading / recording information recorded on the magneto-optical disk according to the standard, the disk is rotated at 4000 rpm, while
When reading / recording information on a magneto-optical disk according to the MA standard, the disk is set to rotate at 3000 rpm. If the magneto-optical disk 12 is ISO standard or ECMA
The information indicating the standard is recorded in advance in a PEP (Phase Encoded Part) control stock disposed in the innermost peripheral area of the magneto-optical disk 12.

The disk cartridge 42 in which the magneto-optical disk 12 is rotatably housed is formed in a hollow thin plate shape. An access opening 42a for access and a motor opening 42b for allowing engagement of the tip of the motor shaft of the spindle motor 44 with the hub 12b are formed. Although not shown, a write protect for prohibiting writing of information to the built-in magneto-optical disk 12 is releasably attached.

The disc cartridge 42 has a shutter 46 for closing the access opening 42a and the motor opening 42b so that the access opening 42a and the motor opening 42b can be simultaneously opened, along a direction Y orthogonal to the insertion direction indicated by the symbol X. It is mounted movably. That is, as shown in FIG. 5, the shutter 46 has an access opening 42a and a motor opening 42b.
6 is movably mounted between a closing position for simultaneously closing the opening and an opening position for simultaneously opening the access opening 42a and the motor opening 42b, as shown in FIG.
It is urged by a spring (not shown) so as to be elastically located at the closed position.

In other words, when the shutter 46 is taken out of the magneto-optical disk device 10, the shutter 46 is elastically held at the closed position shown in FIG. 5, and cleans the magneto-optical disk 12 housed therein. In addition to protecting the recording layer from dust, the operator's fingers do not touch the recording layer. The shutter 46 is moved from the closed position to the open position shown in FIG. 6 against the urging force of a spring (not shown) in the state where the shutter 46 is loaded in the magneto-optical disk device 10, and the opened access opening 42 a The magnetic head 14 and the optical head 16 are allowed to access the recording layer of the disk main body 12a through the disk drive, and information can be written and read, and the spindle motor can be accessed through the opened motor opening 42b. The tip of the 44 motor shaft is the hub 1
2b, the magneto-optical disk 12 becomes rotatable.

The shutter 46 has a recess 46a formed on one side edge of the shutter 46 for use in opening the shutter. Specifically, the recess 46a is provided in the magneto-optical disk 1
In a state in which one of the recording surfaces (surface A) faces downward (that is, the surface A faces the optical head 16), the recording surface is located in the upper half in the thickness direction of the shutter 46. Have been. During the loading operation of the disk cartridge 42 into the magneto-optical disk device 10, the magneto-optical disk device 1 is inserted into the concave portion 46a.
When one end of a pair of open arms 50a, 50b (described later) of a shutter opening mechanism 48 (described later) provided in the cartridge 0 is fitted, and the loading operation of the disc cartridge 42 is further continued, By rotating the open arms 50a and 50b fitted thereto,
The shutter 46 is configured to move from the closed position shown in FIG. 5 to the open position shown in FIG. 6 against the urging force of the spring.

Further, both side surfaces of the front end portion of the disk cartridge 42 have inclined surfaces 42c, 42 slightly inclined inward.
d, and each of these inclined surfaces 42c, 42
d is a hook groove 4 into which a cartridge hook 274 constituting an automatic load / unload mechanism 52 described later is fitted.
2e (for the sake of illustration, only the hook groove 42e formed on one inclined surface 42c is shown). Although the details will be described later, the cartridge hook 274 (described in detail later) fits into the hook groove 42e at the “cartridge unload position” defined during the manual insertion of the disk cartridge 42, and the “cartridge unload position”. The automatic loading / unloading mechanism 52 is activated by further manual insertion up to the “cartridge insertion detection position” defined immediately after the “loading position”, and is automatically activated by the driving force of a driving motor 56 described later. Then, the disk cartridge 42 is pulled in the insertion direction X from the “cartridge insertion detection position” to the “cartridge retraction completion position” in the magneto-optical disk device 10, and subsequently, the information is read from the “cartridge retraction completion position” by the optical head 18. Lower to the readable “cartridge loading position” It is configured so as to load the disk cartridge 42.

In this embodiment, when the ejection (unloading) of the magneto-optical disk 12 is instructed in the magneto-optical disk device 10, a part of the disk cartridge 42 is driven by the driving force of the driving motor 56 described above. The cartridge is automatically ejected from the “cartridge loading position” to a “cartridge unloading position” (ie, a position where the cartridge can be gripped by an operator's hand and further pulled out) protruding from the bezel opening 34. .

The magneto-optical disk 12 usable in the magneto-optical disk device 10 includes an international standard (ISO) double-sided disk having an A surface and a B surface, and a magneto-optical disk device 10 of this embodiment. There are two types of dedicated (non-ISO) single-sided disks. Of these two types of discs, an optical code signal for disc discrimination cannot be newly written on an ISO double-sided disc, but this optical code signal is written on a single-sided disc dedicated to the magneto-optical disc device 10. For example, it is possible to write the information on the innermost control track. Thus, the optical code signal indicating whether the disc is a double-sided disc or a single-sided disc is:
While the disk cartridge 42 is at the “cartridge loading position” and the magnetic head 14 is waiting at an “intermediate position” to be described later, the disk cartridge 42 is read by the optical head 16, and the read information is determined by a disk determining mechanism (not shown). Will be done.

Therefore, when the optical code signal is read, the disc discriminating mechanism judges that the loaded magneto-optical disc 12 is for one side, and based on this, the drive motor 56 is further driven forward. Will be
Although details will be described later, the magnetic head 14 is further lowered from the “middle position” to a “magnetic head load position” described later,
The state is such that information can be read and recorded. When the optical disc signal is not read by the disc discrimination mechanism, the loaded magneto-optical disc 12 is
It is determined that the disc is a reference double-sided disc. In this case, the drive motor 56 is not further driven, and the magnetic head 14 is held at the “intermediate position”, so that the magneto-optical disk device 10 is in a state where only information can be read by the optical head 16.

Here, the magneto-optical disk drive 10 of this embodiment has various features as will be briefly described below. The configuration and operation of the magneto-optical disk drive 10 will be described mainly with respect to the features listed below. Shall be done. (1) A mechanism 20 for attaching the front bezel 22 to the main frame 18: (2) The shutter plate 38 is
A shutter plate opening / closing mechanism 40 that automatically opens and closes in response to the loading / unloading of the cartridge 2; Automatic loading / unloading mechanism 52 for automatically loading from "cartridge loading position" to "cartridge unloading position": (4) The loading timing of the disk cartridge 42, etc. Timing detection mechanism 60 for detection: (5) Vertical positioning mechanism 64 for accurately defining the vertical position of the “magnetic head loading position” of the magnetic head mounting base 62 to which the magnetic head 14 is mounted: (6) Magnetic head "Magnetic head row" Horizontal positioning mechanism 66 for accurately defining the horizontal position at the “drive position”: (7) The magnetic head 14 is attached to the magnetic head mounting base 62
Magnetic head carriage 68 slidably supported on top
Lock mechanism 70 for locking to the outermost peripheral position at the "standby position": (8) laser optical system 72 for guiding laser light to optical head 16
(9) As a part of the initial processing at the time of starting the magneto-optical disk device 10, the magnetic head 14 and the optical head 16 are synchronized with each other at the outermost position of the magneto-optical disk 12. Control procedure to start taking.

First, the above-mentioned (1) front bezel 22
About the attachment mechanism 20 to the main frame 18
This will be described with reference to FIGS. In this embodiment, as shown in FIGS. 8 to 10, the mounting mechanism 20 is integrally mounted on the front bezel 22 side so as to protrude rearward on both ends of the rear surface of the front bezel 22. And a plate-shaped locking hook 76 formed substantially in an L-shape in a side view, and integrally attached to lower portions of both ends of a rear surface of the front bezel 22 so as to protrude rearward, respectively, and have a substantially rectangular shape in a side view. And a plate-shaped mounting plate portion 78 formed in the same manner as described above. Here, in each of the mounting plate portions 78, a mounting groove 82 through which a mounting screw 80 is inserted extends horizontally, and is formed in a state opened to a rear end edge.

On the other hand, the mounting mechanism 20 is formed on the front side of the upright portion 18b of each main frame 18 on the side of each main frame 18 described above, at a position corresponding to the arrangement position of each locking hook 76. A locking groove 84 in which the locking hook 76 is locked in the horizontal direction, and each mounting plate 78 on the front surface of the upright portion 18 b of each main frame 18.
In a state in which it is bent inward into a so-called crank shape at a position corresponding to the disposition position (that is, substantially L-shaped in plan view), an outer surface that slides on the inner surface of the corresponding mounting plate portion 78 is provided. And a mounting piece 86 formed at the bottom.
Here, as shown in FIG. 10, each mounting piece 86 is formed with a thread groove 88 into which the corresponding mounting screw 80 is screwed.

Here, as shown in FIG. 10, the total height H ₁ of the above-described locking hook 76 is set slightly shorter than the opening height H _{2 of} the locking groove 84. More specifically, the height (H ₁ ) of the distal end of the locking hook 76 is set higher than the height of the proximal end, and the upper surface of the distal end is set higher than the upper surface of the proximal end. I have. The locking groove 84 has an opening height on the back side higher than the opening height (H ₂ ) on the entrance side, and an upper end surface defining the opening on the back side has an opening on the entrance side. It is set higher than the specified upper end surface.

The mounting plate 78 and the mounting piece 86
Are fixed to each other by mounting screws 80,
The rising portion 76 a of the locking hook 76 fits into the upper protruding groove 84 a of the locking groove 84, and the upper protruding groove 84 a
The main frame 18 is set so as to engage with the falling portion 18c of the main frame 18 defining the front end face in the horizontal direction. As shown in FIG. 9, the outer surface of the mounting piece 86 extends from the inner surface of the upright portion 18 b of the main frame 18.
At least the thickness of the mounting plate portion 78 is set so as to be deflected inward.

As shown in FIG. 9, a pair of left and right main frames 18 has a connecting plate 90 at its upper end surface.
Are connected to each other. On the upper end surface of each main frame 18, a mounting stay 92 for mounting and fixing an optical head mounting base 24 to be described later and a mounting stay 94 for mounting a control panel, an interface board and the like (not shown) are integrally mounted. Have been.

Since the mounting mechanism 20 is configured as described above, when the front bezel 22 is mounted on the main frame 18, as shown in FIG. The front bezel 22 is brought close to the upright piece 18b of the main frame 18 in a state where the front bezel 22 is in sliding contact with the bottom surface of the main frame 18 while the inner surface of the mounting plate portion 78 is in sliding contact with the outer surface of the corresponding mounting piece 86. By such a proximity operation, the locking hook 76 is completely fitted in the corresponding locking groove 82, and the rear surface of the front bezel 22 is
abuts on the front end face of b.

Thereafter, by raising the front bezel 22 with respect to the main frame 18, as shown in FIG.
Falling portion 18 of rising portion 18b of main frame 18
In the state engaged with c in the horizontal direction, it is fitted into the locking groove 84. When the locking hook 76 is fitted in the locking groove 84, the mounting groove 82 formed in the mounting plate 78 is replaced with the screw groove formed in the mounting piece 86 as shown in FIG. It is in communication with 88. From this state, the screw groove 8 is inserted through the mounting groove 82.
By screwing the mounting screw 80 onto the mounting plate 8, the mounting plate 78 is fixed to the mounting piece 86.

With the mounting plate 78 fixed to the mounting piece 86 via the mounting screw 80 in this way, in other words, the lower part of the front bezel 22 is fixed to the lower part of the upright piece 18b of the main frame 18. In this state, the locking hook 76 is fitted in the locking groove 84 in a state where the movement in the horizontal direction is prohibited. Accordingly, while the lower part of the front bezel 22 is fixed to the lower part of the upright piece 18b of the main frame 18, the upper part of the front bezel is non-removably locked to the upper part of the upright piece 18b of the main frame 18. Become. As a result, by attaching the front bezel 22 to the main frame 18 via the attachment mechanism 20, the front bezel 22 is attached to the main frame 18 by using only two mounting screws 80.
The mounting operation is performed efficiently and the workability can be improved.

Further, in this embodiment, the locking groove 84 into which the locking hook 76 is fitted and the mounting plate 78 are simply mounted without requiring complicated processing on the main frame 18 side. What is necessary is just to form the attachment piece 86 by bending. In this way,
In a state in which the workability is improved, the cost can be reduced by reducing the number of processing steps and the cost of parts when forming the main frame 18.

The configuration of the mounting mechanism 20 is not limited to the above-described configuration, but may be, for example, as shown in FIGS. 12 to 14 as a modified example. Hereinafter, a modified example of the attachment mechanism 20 will be described. The same reference numerals are given to the same portions as those in the above-described embodiment, and the description thereof will be omitted.

In the mounting mechanism 20 'of this modified example, as shown in FIG.
Are provided in the same manner, but are different from the configuration of the above-described embodiment in that the mounting piece 86 is not bent and formed on the main frame 18 and the mounting screw 80 is not used.

More specifically, the mounting plate portion 78 is formed on the rear surface of the front bezel 22 so that the outer surface of the mounting plate portion 78 just slides on the inner surface of the corresponding main frame 18. A projection 96 for locking is formed on the outer surface of the mounting plate portion 78. On the other hand, when the front bezel 22 is attached to the main frame 18, a locking hole 98 into which the projection 96 is to be fitted is formed in a portion of the main frame 18 where the projection 96 is just located.

Since the attachment mechanism 20 'of the modified example is constructed as described above, when the front bezel 20 is attached to the main frame 18, first, the engagement hook 76 is engaged with the engagement groove similarly to the above-described embodiment. 84. At this time, as shown in FIG. 13, the mounting plate 78 is deformed by its own elasticity by the amount of the protrusion 96. Then, the front bezel 22 is lifted and the locking hooks 76 are locked in the horizontal direction.
At the time when the projection 96 is fitted to the projection 4, the projection 96 fits into the corresponding locking hole 98 as shown in FIG. In this manner, the front bezel 22 is tightly fixed to the main frame 18 in a state similar to the mounting mechanism 20 of the above-described embodiment.

In particular, in the mounting mechanism 20 'of this modification, since no mounting screws are used, the cost of parts can be reduced by that much, and the mounting pieces 86 are attached to the main frame 18. Since it is not necessary to bend the main frame 18, the processing cost for processing the main frame 18 can be reduced, and thus the manufacturing cost can be further reduced.

Also, the above-described mounting mechanisms 20, 20 '
In the case, the front bezel 22 is
Then, after the locking hook 76 is pushed into the locking groove 84 along the insertion direction X, the front bezel 2
2 has been described as being configured so that the locking hook 76 is hooked into the locking groove 84 by lifting the locking hook 2. However, the present invention is not limited to this.
After the front bezel 22 is similarly pushed into the main frame 18, the two may be engaged by pushing down, so that the locking hook 76 is hooked into the locking groove 84.

Next, the remaining (2) of the characteristic configuration described above
Before describing (9), the internal structure of the magneto-optical disk device 10 will be described with reference to FIGS. In the loading chassis 26 described above, FIG.
16 schematically shows the frame configuration, a cartridge holder 100 for receiving a disk cartridge 42 inserted into the magneto-optical disk device 10 through a bezel opening 34 and a chassis opening 36 is vertically movable. Has been established.

That is, the cartridge holder 100
A “cartridge receiving position” which is located directly inside the chassis opening 36 and receives the disk cartridge 42 inserted into the magneto-optical disk device 10 through the bezel opening 34 and the chassis opening 36. The optical head 16 disposed below the “position” and disposed on the optical head mounting base 24 enables reading and recording of information on the recording layer of the magneto-optical disk 12, The automatic loading / unloading mechanism 52 described later is configured to be driven to move vertically between two positions of a “cartridge loading position” that can be rotationally driven by the motor 44.

As shown in FIGS. 16 and 17, the cartridge holder 100 is basically formed in a housing having a front surface and a rear surface which are completely open to receive the disk cartridge 42. The top plate 100a
, A bottom plate 100b, and both side plates 100c and 100d. Here, as shown only in the left half of FIG. 18, the stored disk cartridge 42 is supported only at both ends thereof, and the magneto-optical devices of the optical head 16 and the spindle motor 44 disposed on the optical head mounting base 24 are provided. In order to allow access to the lower surface of the disk 12, the bottom plate 100b is formed with a lower opening 100e which is opened almost entirely except for the left and right ends thereof. On the other hand, in order to allow the magnetic head 14 disposed on the magnetic head mounting base 62 to access the upper surface of the magneto-optical disk 12, the top plate 100a is largely opened except for the left and right ends and the front end thereof. An opening 100f is formed.

As shown in FIGS. 17 and 18, the cartridge holder 100 is provided with a "cartridge receiving position" and a "cartridge loading position" at the left and right edges of the top plate 100a of the cartridge holder 100, respectively. Load / unload mechanism 52 for vertically driving between
And two cam grooves 102a, 102b; 104a, 104b for vertical movement of the cartridge holder formed on a pair of left and right control cam plates 102, 104 (to be described later).
Pin 10 as a cam follower for engaging with each other
6a, 106b, 106c, and 106d are mounted in such a manner as to protrude outward through the mounting stays 108a; 108b, 108c, and 108d, respectively.

The shutter 4 of the disc cartridge 42 being inserted is provided at the rear of the cartridge holder 100.
A shutter opening mechanism 48 for opening and driving the disk 6 in accordance with the insertion operation of the disk cartridge 42 is provided. The shutter opening mechanism 48 includes open arms 50a and 50b whose rear ends are rotatably supported around a support shaft 110 on the lower surfaces of the rear ends of both edges of the top plate 100a, and supports each of the top plates 100a. A guide groove 112 formed in an arc shape centered on the shaft 110 to guide a middle part of the corresponding open arm 50a, 50b;
a, 50b are urged to rotate outward (that is, FIG. 18).
(See FIG. 18) rotates the right open arm 50a clockwise, and the right open arm 50b (not shown in FIG. 18) rotates counterclockwise. It is provided with.

Here, both open arms 50a, 50b
Indicates the mounting height position of the disk cartridge 42.
At the time of insertion (that is, A
(The surface is facing downward and the surface B is facing downward), and is set so as to be selectively fitted into the concave portion 46a. Specifically, the left open arm 50a is It is set higher than the open arm 50b. In this manner, the open arms 50a and 50b can rotate independently of each other without interference. As a result, when the magneto-optical disk cartridge 42 is inserted with the surface A of the magneto-optical disk 12 facing downward, the tip of the open arm 50a on the left side in the figure fits into the concave portion 46a, and the surface B is If it is inserted downward, the tip of the open arm 50b on the right side in the figure fits into the recess 46a.

On the other hand, the standby position of each of the open arms 50a and 50b is defined by the fact that the respective intermediate portions abut the outer ends of the corresponding guide grooves 112. In this standby position, the left open arm 50a The tip of the open arm 50b on the right side is inserted into the recess 46a of the shutter 46 of the disk cartridge 42 having the surface A inserted upward, and the disk having the disk B inserted upward on the surface B. Each is set so as to fit into the concave portion 46 a of the shutter 46 of the cartridge 42. While the disc cartridge 42 is being inserted, the corresponding open arms 50 a and 50 b
a, the open arm 50a or 50b fitted in the concave portion 46a is pushed by the shutter 46 and the torsion spring 114 is pressed.
As a result, the shutter 46 in which the tip of the open arm 50a or 50b is fitted into the concave portion 46a is moved from the closed position shown in FIG. 5 to the open position shown in FIG. The access opening 42a and the motor opening 42b are respectively opened. The concave portion 46
open arm 50a or 50b that does not fit into a
Simply comes into contact with the front end surface of the shutter 46 or the front end surface of the disk cartridge 42, and rotates freely with the insertion operation.

A gear chassis 118 on which a drive mechanism 116 constituting the automatic load / unload mechanism 52 is mounted is fixed above the front portion of the loading chassis 26, as shown in FIGS. It is arranged in the state where it was set. On the gear chassis 118, the above-described drive motor 56 constituting a drive source is mounted. On the other hand, at the rear of the loading chassis 26, a magnetic head mounting base 62 on which the magnetic head 14 is disposed is disposed so as to be vertically movable.

More specifically, the magnetic head mounting base 62 includes a “standby position” located above the cartridge holder 100 at the “cartridge receiving position” and a cartridge holder 100 located at the “cartridge loading position”.
Is located directly above the magnetic head mounting base 62.
The "magnetic head loading position" which enables reading and recording of information on the recording layer of the magneto-optical disk 12 in cooperation with the above-described optical head 16 by the magnetic head 14 disposed on the lower surface of the The automatic load / unload mechanism 52, which will be described later, vertically moves between three positions of "position" and "intermediate position" intermediate between "magnetic head load position". Have been.

On the other hand, on the gear chassis 118, the cartridge holder 100 is moved up and down between a “cartridge receiving position” and a “cartridge loading position” in synchronization with the loading / unloading operation of the disk cartridge 42. A synchro servo board 12 provided with a synchro servo control circuit for controlling the magnetic head mounting base 62 to move vertically between a "standby position", an "intermediate position", and a "magnetic head load position".
0 is attached. This synchro servo board 12
In order to dissipate the heat generated from zero, a heat radiating plate 122 is attached to a portion of the upper cover 28 located immediately above the synchro servo board 120. A shutter plate opening / closing mechanism 40 for opening and closing the shutter plate 38 is provided in front of the gear chassis 118.

The control room, which is located below the optical head mounting base 24, has a position control and a drive control for the magnetic head 14 and the optical head 16, and a control for recording and reading information. Control boards 124a and 124b in which a control circuit, a synchronization circuit, and the like are incorporated are arranged in a two-stage configuration.

Next, as shown in FIG.
Is mounted on the optical head mounting base 24 via a linear bearing 126 (shown in FIG. 20).
Is mounted on an optical head carriage 128 movably supported in the radial direction of the optical head. The optical head carriage 128 has a coil 13 fixed to both ends thereof.
0 is arranged around a yoke 132 disposed so as to extend along both sides of the movement path of the optical head carriage 128, and the magneto-optical disk 1 is
2 is driven to move to any position along the radial direction.

On the other hand, the linear bearing 126 described above
As shown in FIG. 20, a fixing member 136 fixed to the optical head mounting base 24 and the optical head carriage 12
8, a movable member 138 fixed to the lower surface of the
6 and a bearing ball 140 provided between the movable member 138. Here, the fixing member 1
Reference numeral 36 denotes a substantially U-shaped member formed of a long member (not shown in detail).
Numeral 8 is narrower than the fixing member 136, formed in a substantially U-shape, and elongated. Rolling grooves (not shown) are formed on side surfaces of the fixed member 136 and the movable member 138 facing each other, and a bearing ball 140 is rotatably fitted between the facing rolling grooves.

The optical head 16 converges a laser beam from a laser light source 370 of a laser optical system 72, which will be described later, onto the recording layer of the magneto-optical disk 12 via the objective lens 146 to read information (that is, read information). At the time of reproduction, the light reflected from the recording layer is received by a light-receiving element (not shown) to read a magneto-optical recording signal. Light is converged on the recording layer of the magneto-optical disk 12 to raise the temperature of the recording layer to the Curie temperature, so that information can be written (or overwritten) on the recording layer in cooperation with the magnetic head 14. Have been.

As shown in FIG. 19, the optical head carriage 128 is provided on the magneto-optical disk 12 along the radial direction.
A carriage arm 148 extending along the insertion direction X of the disk cartridge 42 is attached. An outer end of the carriage arm 148, that is, a radially outer peripheral end of the magneto-optical disk 12, is attached to the carriage arm 148. As will be described in detail later, in order to synchronize the operation of the magnetic head 14 and the optical head 16 along the radial direction of the magneto-optical disk 12, a reflector 154 as a detection target is detected by the pair of photocouplers 150 and 152. Is attached. The spindle motor 44 described above is mounted on the optical head mounting base 24 in a state adjacent to the optical head 16 located on the radially innermost end side of the magneto-optical disk 12 on the radially inner peripheral side.

Next, as shown in FIG.
Is mounted on a lower surface of a magnetic head carriage 68 movably supported in the radial direction of the magneto-optical disk 12 via a linear bearing 156 (shown in FIG. 20) on a lower surface of the magnetic head mounting base 62. . The magnetic head carriage 68 has a linear motor in which coils 158 fixed to both ends of the magnetic head carriage 68 are arranged around a yoke 160 arranged so as to extend along both sides of the movement path of the magnetic head carriage 68. By 162, the magneto-optical disk 12 is moved and driven to an arbitrary position along the radial direction.

On the other hand, the linear bearing 156 described above
As shown in FIG. 20, the magnetic head mounting base 62
, A movable member 166 fixed on the magnetic head carriage 68, and a fixed member 164.
And a bearing ball 168 interposed between the movable member 166 and the movable member 166. Here, the fixing member 16
4 is a substantially U-shaped member which is not shown in detail but is formed of a long member.
Is narrower and substantially U-shaped than the fixing member 164, and
It is formed long. Rolling grooves (not shown) are formed on side surfaces of the fixed member 164 and the movable member 166 that face each other, and a bearing ball 168 is rotatably fitted between these opposing rolling grooves.

As shown in FIG. 21, a magnetic head carriage 68 is provided on the magneto-optical disk 12 in the radial direction.
A carriage arm 170 extending along the insertion direction X of the disk cartridge 42 is attached. An outer end of the carriage arm 170, that is, a radially outer end of the magneto-optical disk 12 is As will be described in detail later, as a synchronization mechanism for synchronizing the operation of the magnetic head 14 and the optical head 16 along the radial direction of the magneto-optical disk 12, a pair of photocouplers that emit light toward the above-described reflector 154 is used. 150 and 152 are arranged in a state of being juxtaposed along the extending direction of the carriage arm 170. Each of the photocouplers 150 and 152 includes a light emitting element that emits light toward the reflector 154 and a reflector 15.
And a light receiving element for receiving the reflected light from
The output signal from the light receiving element is sent to the above-described control circuit as a synchronization detection signal.

Here, the positional relationship between the reflector 154 and the pair of photocouplers 150 and 152 is determined by the position where the magnetic head 14 and the optical head 16 are aligned in the vertical direction, that is, both in the vertical direction. When the positions are coincident (in other words, a predetermined magnetic field can be applied by the magnetic head 14 to a predetermined portion of the recording layer which is irradiated with a laser beam via the optical head 16 and raised to the Curie temperature. Are set so that the outputs from the light receiving elements of both photocouplers 150 and 152 are equal to each other.

In this embodiment, the magnetic head 14 and the optical head 16 are respectively provided with a magnetic head carriage 68 and an optical head carriage 128 to which they are attached.
Are positioned by the corresponding linear motors 162 and 134 so as to be brought into a synchronously detectable range while being moved to the radially outermost position of the magneto-optical disk 12. Specifically, when the magnetic head 14 and the optical head 16 are at the outermost position in the radial direction of the magneto-optical disk 12, the light emitted from at least one of the photocouplers 150 and 152 is reflected by the reflector 154. , The corresponding photocoupler 150,
The light receiving element 152 is set to receive light.

Here, the optical head carriage 128 is driven by a driving force from a linear motor 134 driven based on a control signal from a control circuit (not shown) provided on the control boards 124a and 124b.
The magnetic head carriage 68 is driven to move to a desired position along the radial direction of the control board 124a, 12b.
4b, the driving force of a linear motor 162 driven so that the outputs from the light receiving elements of both photocouplers 150 and 152 become equal to each other based on a synchronization signal from a synchronization circuit (not shown) provided on the magneto-optical disk 12. It is driven to move along the radial direction. In this way, the magnetic head 14 and the optical head 16 are integrally moved along the radial direction of the magneto-optical disk 12 in synchronization with each other.

On the other hand, as shown in FIG. 21, a cantilevered load beam 172 is provided on the lower surface of the magnetic head carriage 68.
Is fixed by fixing screws 174 with its base end positioned on the rotation center side of the magneto-optical disk 12. The above-described magnetic head 14 is attached to the tip of the load beam 172 which is directed to the outer peripheral side of the magneto-optical disk 12. Here, this load beam 172
In the state where the magnetic head mounting base 62 is at a position other than the magnetic head loading position, the distal end thereof is bent downward until it comes into contact with the magnetic head holding plate 176 by the spring force of the load beam 172, and is slightly inclined downward. It has been done. Further, when the magnetic head mounting base 62 is brought to the magnetic head loading position by the automatic load / unload mechanism 52 to be described later, the magneto-optical disk 12 is already set to be rotationally driven by the spindle motor 44. Therefore, the magnetic head 14 having the air-floating slider surface is held at a stable height position at a position where the spring force of the load beam 172 and the wind pressure by the rotating magneto-optical disk 12 are balanced. . As a result, when the magnetic head 14 is brought to the magnetic head loading position, the magnetic head 14 is substantially parallel to the magneto-optical disk 12 with a slight gap therebetween, and is in a state of being extremely close to the recording layer on the upper surface of the magneto-optical disk 12. Will be achieved.

Both ends of the magnetic head mounting base 62 along the insertion direction X are bent downward, and the outer surfaces of the magnetic head mounting base 62 are provided on both outer surfaces.
For moving up and down between a "standby position", an "intermediate position", and a "magnetic head loading position". Of the two cam grooves 102b ₁ ,
102b ₂ ; cam pins 178a as cam followers for engaging with 104b ₁ and 104b _{2 respectively} ;
178c and 178d are mounted so as to protrude outward.

On the other hand, the loading chassis 26
Is the front bezel 22 as shown in FIG.
A front portion 26a which is located directly inward of the vehicle, and has a chassis opening 36 communicating with the bezel opening 34;
The front portion 26a is integrally formed with a pair of left and right side portions 26b and 26c extending rearward from both left and right ends of the front portion 26a along the insertion direction X. Each side part 26b,
26c, a concave portion 2 extending along the insertion direction X
6d and 26e are formed by bending the upper portions of the corresponding side portions 26b and 26c, respectively. A pair of left and right control cam plates 102 and 104 whose cam shapes will be described in detail later are fitted in the pair of left and right concave portions 26d and 26e so as to be slidable along the insertion direction X, respectively.

A pair of cam pins 178a; 1 attached to the left and right side edges of the magnetic head mounting base 62 are provided on the upright side plates of the recesses 26d and 26e.
78b, 178c and 178d are respectively inserted,
A pair of first vertical grooves 180a extending along the vertical direction
₁ ; 180a ₂ , 180b ₁ ; 180b ₂ are formed to penetrate in the thickness direction. That is, the magnetic head mounting base 62 has the cam pins 178a, 178b, 178c; 178d mounted thereon and the corresponding first vertical grooves 180a ₁ ; 180a ₂ , 180b ₁ ;
Through fitting of the 80b _2, it is movably limited only along the vertical direction. Note that these cam pins 178a;
178b, 178c; 178d, the corresponding first vertical groove _{180a 1; 180a 2, 180b 1} ; the 180b ₂ after penetrating the cam for a magnetic head mounting base vertically movable formed on the control cam plate 102, 104 corresponding Groove 1
02b ₁ ; 102b ₂ , 104b ₁ ; and 104b ₂ .

On the other hand, a pair of cam pins 106a; 10a attached to the left and right side edges of the cartridge holder 100 are provided on the upright side plates of the recesses 26d and 26e.
6b, 106c; 106d are respectively inserted and the second vertical grooves 182a ₁ ; 18 extending along the vertical direction.
2a ₂ , 182b ₁ ; 182b ₂ are formed so as to penetrate in the thickness direction. That is, the cartridge holder 100 has the cam pins 106a; 1 attached thereto.
Through the fitting of the corresponding second vertical grooves 182a _1, 182a ₂ , 182b ₁ ; 182b ₂ with the corresponding second vertical grooves 182a ₁ ; The cam pins 106a; 106b, 1
06d; 106d correspond to the corresponding second vertical grooves 182a.
₁ ; 182a ₂ , 182b ₁ ; 182b ₂ , and then a cam groove 102 a ₁ for moving up and down the cartridge holder formed on the corresponding control cam plate 102, 104.
a _2, 104a _1; is set so as to respectively fit into 104a _2.

A shutter plate opening / closing mechanism 4 to be described later is provided at the front of the upright side plate of each of the recesses 26d and 26e.
The openings 186a and 186b through which the cam pins 184a and 184b provided in the “0” are respectively inserted are formed so as to penetrate in the thickness direction. Incidentally, these cam pins 184a, 1
84b is set so as to fit into the shutter plate opening / closing cam grooves 102c, 104c formed in the corresponding control cam plates 102, 104 after passing through the corresponding openings 186a, 186b. Here, each recess 26
A plurality of mounting stays 188 to which the above-described gear chassis 118 is mounted and fixed are bent and formed on the opposing inner side surfaces of the upper front portions of the upright side plate portions d and 26e. A plurality of mounting stays 190 for mounting and fixing the loading chassis 26 on the optical head mounting base 24 described above are bent on the opposing inner side surfaces at the lower front part of the upright side plate portions of the concave portions 26d and 26e. Is molded.

Next, the structure of the left and right control cam plates 102 and 104 will be described with reference to FIGS. Here, each of the control cam plates 102 and 104 is integrally formed of plastic, and is configured to slide in the corresponding recesses 26d and 26e without bearings. 23. The left control cam plate 102 has a cam groove 102 for opening and closing the shutter plate along the insertion direction X from the chassis opening 36 side, as shown in FIG.
c, first cam groove 102 for vertical movement of cartridge holder
a ₁ , a _first cam groove 102b ₁ for vertically moving the magnetic head mounting base, a _second cam groove 102a ₂ for vertically moving the cartridge holder, a second cam groove 102b ₂ for vertically moving the magnetic head mounting base, and will be described later. The pressing cam grooves 102d that constitute the horizontal positioning mechanism 66 are sequentially formed.

The right control cam plate 104 has an inner surface shape as shown in FIG. 25 and an outer surface shape as shown in FIG. 26, respectively.
Along the insertion direction X from the chassis opening 36 side, a cam groove 104c for opening and closing the shutter plate, a first cam groove 104a ₁ for vertically moving the cartridge holder, a first cam groove 104b ₁ for vertically moving the magnetic head mounting base, and a cartridge. Second cam groove 104a ₂ for vertical movement of holder, second cam groove 104b ₂ for vertical movement of magnetic head mounting base
Are sequentially formed. Here, each control cam plate 102,
The guide groove 1 has a guide groove 104 extending in the insertion direction X.
92, 194 are formed, and the corresponding recesses 26d,
Guide pins 196, 1 fitted into the corresponding guide grooves 192, 194 respectively are provided on the outer side surface of the upright side plate portion of 26e.
98 (shown in FIG. 22) are implanted. In this way, each of the control cam plates 102 and 104 is regulated so as to move only in the insertion direction X.

The first and second cam grooves 102b _1, 102b ₂ , 104b ₁ for vertically moving the magnetic head mounting base in each of the left and right control cam plates 102, 104;
All the remaining cam grooves, except for the lower half of each of the 104b ₂ , do not penetrate in the thickness direction, that is, are constituted by bottomed grooves opened only on the respective inner surfaces of the corresponding control cam plates 102, 104. Have been. On the other hand, the first and second cam grooves 102b ₁ for moving the magnetic head mounting base up and down;
The lower half of each of 2b ₂ , 104b ₁ ; 104b ₂ is formed of a through groove penetrating in the thickness direction of the corresponding control cam plate 102, 104.

When the automatic loading / unloading mechanism 52, which will be described later, starts the automatic loading operation in accordance with the insertion operation of the disk cartridge 42, the left control cam plate 102 is directed rearward along the insertion direction X. The control cam plate 104 on the right side is set so as to be driven to move forward along the direction opposite to the insertion direction X. Therefore, the left control cam plate 102
Cam groove 102 for opening and closing the shutter plate
c, first cam groove 102 for vertical movement of cartridge holder
a ₁ , a _first cam groove 102b ₁ for vertically moving the magnetic head mounting base, a _second cam groove 102a ₂ for vertically moving the cartridge holder, a second cam groove 102b ₂ for vertically moving the magnetic head mounting base, A cam groove 104c for opening and closing a shutter plate formed on the control cam plate 104;
First cam groove 104a for vertical movement of cartridge holder
₁ , a first cam groove 104b ₁ for vertically moving the magnetic head mounting base, a _second cam groove 104a ₂ for vertically moving the cartridge holder, and a _second cam groove 104b ₂ for vertically moving the magnetic head mounting base. Are formed so as to be in a left-right inverted state.

As a result, as shown in FIG.
2, cam grooves 102a ₁ and 102b shown in a right side view
₁ , 102a ₂ , 102b ₂ and the cam groove 1 shown in FIG. 25 when viewed from the left side of the right control cam plate 104.
The cams 04a ₁ , 104b ₁ , 104a ₂ , and 104b _{2 have} the same shape, although their arrangement positions are different. In other words, as shown in FIG. 27, the cam grooves 102a ₁ ;
The cam-shaped grooves A of a ₂ , 104a ₁ ; 104a ₂ are respectively set to the same shape, and the cam grooves 102b ₁ ; 102b ₂ , 104b for vertically moving the magnetic head mounting base.
₁ ; 104b ₂ are respectively set to the same shape, and further, the cam grooves 102 for opening and closing the shutter plate.
The cam groove shapes C and 104c are set to the same shape.

The cam grooves 102a ₁ ; 102a ₂ , 104a ₁ ; 104a ₂ for the vertical movement of the cartridge holders and the cam grooves 102b ₁ ; 102b ₂ , 104b ₁ ; 104b for the vertical movement of the magnetic head mounting base.
_As shown in FIG. 27, the cam groove shape B of the _second cam groove and the cam groove shape C of the cam grooves 102c and 104c for opening and closing the shutter plate are set so as to achieve their respective operation positions. Have been.

That is, the cam groove shape A of the cam grooves 102a ₁ ; 102a ₂ , 104a ₁ ; 104a ₂ for vertically moving the cartridge holder defines the “cartridge receiving position” of the cartridge holder 100, and the disk cartridge 42 A _first horizontal cam groove A1 for holding the cartridge holder 100 at the "cartridge receiving position" while being moved from the "insertion detection position" to the "cartridge retraction completion position"(P2);
A _second inclined cam groove A2 inclined obliquely downward from the rear end of the first cam groove A1 in the insertion direction and a lower end of the _second cam groove A2 are connected to define a "cartridge loading position". It is configured to include a third and a horizontal cam groove portion a _3.

Further, cam grooves 102b ₁ ; 102b ₂ , 104b ₁ ; 104 for vertical movement of the magnetic head mounting base.
cam groove shape B of b _2, the magnetic head mounting base 62
The first horizontal cam groove portion B ₁ which defines the "standby position" of,
A second inclined cam groove portion B ₂ which is inclined from the first insertion direction rear end of the horizontal cam groove portions B ₁ obliquely downward, is connected to the second lower end of the cam groove B _2, the magnetic head mounting base 62 Third horizontal cam groove B defining "intermediate position"
_3, a fourth inclined cam groove portion B ₄ in inclined from the third insertion direction rear end of the horizontal cam groove portions B ₃ obliquely downward, is connected to the lower end of the fourth cam groove B _4, mounting the magnetic head It is configured to include a fifth horizontal cam groove portions B ₅ defining a "magnetic head loading position" of the base 62.

Further, a cam groove 1 for opening and closing the shutter plate is provided.
02c, the cam profile C of 104c includes a first horizontal cam groove portions C ₁ which defines the lowermost position of the shutter plate 38,
A second inclined cam groove C ₂ inclined from the first insertion direction rear end of the horizontal cam groove portions C ₁ obliquely upward, is connected to the second upper end of the cam groove C _2, the uppermost position of the shutter plate 38 a third horizontal cam groove portions C ₃ defining a, a fourth inclined cam groove portion C ₄ inclined from the third insertion direction rear end of the horizontal cam groove portions C ₃ obliquely downward, the fourth cam groove C It is connected to the _fourth bottom, as well as defining the lowermost position of the shutter plate 38 is configured to have a horizontal cam groove portions C ₅ of the fifth upper is opened largely.

As shown in FIGS. 23 to 26, a driving force from a driving motor 56 is transmitted to a bottom surface of each of the control cam plates 102 and 104 in an automatic load / unload mechanism 52 described later. Joint recesses 102e and 104e are formed.

Here, the (5) vertical positioning mechanism 64 having a characteristic configuration in this embodiment will be described with reference to FIGS. 23 to 26 and FIG. 7 described above.

That is, the magnetic head mounting base 62 on which the magnetic head 14 is disposed is mounted on an automatic load / load
By the operation of the unloading mechanism 52, the front edge is lowered from the “standby position” to the “magnetic head load position”, and its front edge is bent inward at both side portions 26 b and 26 c of the loading chassis 26. The pair of left and right front position restricting pieces 26f, 26g formed in the retracted state (FIG. 7).
Shows only one front position regulating piece 26g for convenience of illustration. ) And a pair of left and right rear position regulating pins 24a, 2 integrally formed with the rear edge thereof standing on the rear part of the optical head mounting base 24.
4b, the position in the vertical direction is set so as to be defined. In other words, in the vertical positioning mechanism 62, the front edge and the rear edge of the magnetic head mounting base 62 are elastically pressed on the front position restricting pieces 26f, 26g and the rear position restricting pins 24a, 24b. The magnetic head is positioned in the "magnetic head load position" accurately by securely mounting in a contact state.

For this reason, the first and second cam grooves 102b _{1 and} 102b for vertically moving these magnetic head mounting bases.
₂ , 104b ₁ ; 104b ₂ have the fourth and fifth, respectively.
The pressing pieces 200a, 2 constituting the vertical positioning mechanism 64 are positioned above the horizontal cam grooves B ₄ , B _5.
Cam grooves 102b ₁ ; 102b ₂ , 104b ₁ ;
It is arranged in a state of being connected integrally to an intermediate portion of b _2. Here, this vertical positioning mechanism 64 corresponds to FIG.
25, and the left and right control cam plates 102, 10
4 is attached to each outer surface and has a corresponding pressing piece 20.
0a, 200b; 200c, 200d at the positions shown in the figure, respectively.
204 is further provided.

The first and second cam grooves 102b _1, 102b ₂ , 104 for vertically moving the magnetic head mounting base.
b _1; cam pin was brought to a fifth cam groove B ₅ each _{104b 2 178a; 178b, 178c;} 178
As for d, the front edge and the rear edge of the magnetic head mounting base 62 are placed on the front position regulating pieces 26f and 26g and the rear position regulating pins 24a and 24b, and are brought to the “magnetic head load position”. In the state, the corresponding cam groove portion B5
It is set up so that it can be lifted slightly from the bottom surface.
As a result, at this “magnetic head loading position”, the cam pins 178a; 178b, 178c; Will receive it.

Thus, these cam pins 178a;
178b, 178c; 178d is mounted, and the magnetic head mounting base 62 on which the magnetic head 14 is disposed.
Is a "magnetic head loading position" defined by the cam groove B ₅ of the fifth, these pressing pieces 200a, 200b, 2
00c, 200d and the wire springs 202, 204, so that the front edge and the rear edge of the magnetic head mounting base 62 are aligned with the front position regulating piece 2.
6f, 26g and the rear position regulating pins 24a, 24b are securely placed in a contact state while being elastically pressed. As a result, the magnetic head mounting base 6
2, the vertical position of the magnetic head 14 attached to
In a state where this is brought to the “magnetic head load position”, accurate positioning is performed.

Next, with respect to (2) the opening / closing mechanism 40 of the shutter plate 38 having a characteristic configuration in this embodiment,
This will be described with reference to FIGS.

As shown in FIGS. 28 and 29, the shutter plate opening / closing mechanism 40 is disposed on both left and right sides of the above-described loading gear chassis 26. The swing levers 212 and 210 are pivotally supported at their rear ends around support pins 208 and 206, and are provided at the intermediate portions of the swing levers 212 and 210 so as to project outward. The cam pins 216 and 214 fitted into the shutter groove opening and closing cam grooves 102c and 104c of the corresponding control cam plates 102 and 104, and the two support pins 208 and 206.
The torsion springs 22 are respectively wound around and bias the corresponding swing levers 212 and 210 so as to rotate downward respectively.
0,218. Here, the shutter plate 38 is rotatably supported at the tips of both swing levers 212 and 210.

The shutter plate opening / closing mechanism 40
Is a fan-shaped movable gear 224 that is rotatably attached to the tip of the right swing lever 210 around the support shaft 222;
A fixed gear 226 integrally formed at the upper right end of the shutter plate 38 and meshing with the movable gear 224 urges the movable gear 224 to rotate clockwise in FIG. 28 (that is, the movable gear 224). And a torsion spring 228 for urging the shutter plate 38 to which the fixed gear 226 meshing with the shutter plate 38 is fixed in a direction to close the chassis opening 36. The rear end of the movable gear 224 comes into contact with the top plate 118c which is bent inward from the upper end of the left side plate 118a of the gear chassis 118 when the swing lever 210 is raised, and The locking portion 230 set so as to restrict the rotation thereof is integrally formed.

The opening / closing operation of the shutter plate 38 in the shutter plate opening / closing mechanism 40 configured as described above will be described with reference to FIGS. The cam pin 214 attached to the right swing lever 210
Is fitted in a cam groove 104c formed in the corresponding right control cam plate 104, as shown in FIGS.
5, the swing lever 210 is swingably driven based on the movement of the left control cam plate 102 for convenience of illustration.

As shown in FIG. 30, when the disk cartridge 42 is not loaded in the magneto-optical disk device 10 at all, the swing levers 210 and 212 are moved to the cam grooves 102c and 10 corresponding to the respective cam pins 214 and 216.
Based on the position to be fitted on a horizontal cam groove portion C ₁ which defines the lowermost position 4c, are brought to the position of the lowermost, in the result, the shutter plate 38 is the same height position and the chassis opening 36 Have been done. In this state, the locking portion 230 is not in contact with the top plate 118 c of the gear chassis 118, so that the shutter plate 38 is moved by the biasing force of the torsion spring 228.
6 against the back of the front part 26a, and in this way,
The chassis opening 36 is completely closed from the inside.

From the non-loaded state shown in FIG. 30, the operator starts the loading operation of the disk cartridge 42 and manually inserts the tip of the disk cartridge 42 into the magneto-optical disk device 10 through the chassis opening 36 slightly. Then, as shown in FIG.
, The shutter plate 38 rotates against the urging force of the torsion spring 228 that urges the movable gear 224 counterclockwise to mesh with the fixed gear 226 fixed to the shutter plate 38. Will be released slightly.

When the operator further manually inserts the disc cartridge 42 inward from the slight insertion state shown in FIG. 31, as shown in FIG. 32, the tip of the disc cartridge 42 closes the shutter plate 38. In a state where the disk cartridge 42 is flipped up and reaches the entrance of the cartridge holder 100 at the “cartridge receiving position” and further inserted, the rear end of the disk cartridge 42 is outside the chassis opening 36 as shown in FIG. Is slightly left in the cartridge holder 100.

From the state shown in FIG. 33, the disk cartridge 42 is further slightly inserted manually and brought to the "cartridge insertion detection position", whereby the timing detecting mechanism 60 described later detects the insertion operation of the disk cartridge 42. Then, the automatic load / unload mechanism 52 is activated, and thereafter, the disk cartridge 4
2 is drawn by the driving force of the driving motor 56.
That is, FIG. 33 shows the “cartridge unload position” that defines the timing immediately before the automatic loading start timing. In addition, from the position shown in FIG.
3, the lower end of the shutter plate 38 is in sliding contact with the upper surface of the disk cartridge 42 by the urging force of the torsion spring 228 described above.

When the automatic loading / unloading mechanism 52 starts to draw in the disk cartridge 42 from the “cartridge insertion detection position” by the motor force, the left control cam plate 102 is actuated by the action of the automatic loading / unloading mechanism 52. It starts to be moved and driven to the back side along the insertion direction X. The right control cam plate 104 is inserted in the insertion direction X.
In the opposite direction.
With the movement of the control cam plates 102 and 104, the cam pins 214 and 216 attached to the intermediate portions of the two swing levers 210 and 212 move to the corresponding cam grooves 102c and 104c.
First relative sliding horizontal cam groove portion C _1, it will be displaced upwardly along the cam groove 102c, the second inclined cam groove C ₂ which is inclined upward 104c of. Thereby, both swing levers 210 and 212 are supported by the support pin 20.
6, 208 is rotated clockwise in the figure against the urging force of the torsion springs 218, 220. As a result, until the state shown in FIG.
The tip of 10,212 will rise.

In the state shown in FIG. 34, the movable gear 2
24 is formed at the rear of the gear chassis 1
18 comes into contact with the top plate 118c from below. Accordingly, while the disc cartridge 42 is being inserted from the position shown in FIG. 33 to the position shown in FIG. The state has been made.

When the disk cartridge 42 is further pulled into the cartridge holder 100 from the state shown in FIG. 34, the control cam plates 102 and 104 are synchronized with this.
Also moved further, the cam pin 214, 216 corresponding cam groove 102c, are brought to the third horizontal cam groove C ₃ defining the uppermost position in 104c. Here, in a state where the swing levers 210 and 212 are rotated to the uppermost position, the locking portion 230 formed at the rear portion of the movable gear 224 is maintained in a state of being in contact with the top plate 118c of the gear chassis 118 from below. As shown in FIG. 35, the movable gear 2
24 is driven clockwise against the urging force of the torsion spring 228, and as a result, the shutter plate 38 provided with the fixed gear 226 meshing with the movable gear 224 is rotated counterclockwise. become.

In this manner, the tip of the shutter plate 38 is lifted upward from the upper surface of the disk cartridge 42, so that interference with the disk cartridge 42 is avoided. The state shown in FIG. 35 is substantially unrelated when loading the disk cartridge 42, but is necessary when unloading the disk cartridge 42. In the state shown in FIG. 35, the disc cartridge 42 is completely inserted (pulled) into the cartridge holder 100, and the "cartridge retraction completed position" is defined.

As described above, at the "cartridge retraction completed position" shown in FIG. 35, the disc cartridge 42 is in the cartridge holder 100 at the "cartridge receiving position".
Fully inserted into the automatic load / unload mechanism 52
Stops the further insertion operation of the disk cartridge 42, but continues the movement operation of the control cam plates 102 and 104. As a result, the cam pin 214, 216 corresponding cam groove 102c, brought to the fourth inclined cam groove portion C ₄ of sloping downward 104c, the swing lever 210,
212 rotates downward. In response to the downward rotation of the swing levers 210 and 212, the movable gear 224 rotates counterclockwise by the urging force of the torsion spring 228, and the fixed gear 2 meshed with the movable gear 224.
The shutter plate 38 to which 26 is attached rotates clockwise. In this way, as shown in FIG. 36, the shutter plate 38 is in the upright state, and comes into contact with the back surface of the front portion 26a of the loading chassis 26.

Incidentally, when the control cam plates 102 and 104 move from the state shown in FIG. 35 to the state shown in FIG.
As will be described in detail later, the cartridge holder 100 has a cam groove 102a ₁ for moving the cartridge holder up and down corresponding to the cam pins 106a to 106d attached thereto.
a ₂ , 104a ₁ ; By relatively moving within 104a ₂ , the cartridge is lowered from the “cartridge receiving position” to the “cartridge loading position”.

The control cam plates 102 and 104 are further moved from the state shown in FIG.
Along with the movement of the cam pins 2 and 104, the cam pins 214 and 216 are displaced downward along the _fourth inclined cam groove portions C4 inclined downward in the corresponding cam grooves 102c and 104c. As a result, the two swinging levers 210 and 212 are moved around the support pins 206 and 208 by the torsion springs 218 and 2.
In response to the urging force of 20, the lever 20 is rotated counterclockwise in the figure. As a result, both swing levers 210 and 212 are lowered until the state shown in FIG. 37 is reached. And
In the state shown in FIG. 37, the cam pin 214, 216 is brought to the corresponding cam grooves 102c, 104c since the fifth horizontal cam groove portions C in ₅ that defines the lowermost position, the shutter plate 38 is the back of the chassis opening 36 Will be completely closed.

By configuring the shutter plate opening / closing mechanism 40 in this manner, the chassis opening and closing operation can be performed in a state where the disk cartridge 42 is not loaded and in a state where the disk cartridge 42 is completely loaded in the magneto-optical disk device 10. The shutter 36 is completely closed by the shutter plate 38, and the internal hermetic state is maintained. As is clear from the above description, when unloading the loaded disk cartridge 42, the shutter plate opening / closing mechanism 40 performs an operation completely opposite to the above-described loading operation. First, the shutter plate 38 rises, and stands by at a position above the disk cartridge 42 where the shutter plate 38 does not interfere with it.
After the disk cartridge 42 is completely removed, the disk cartridge 42 descends and operates again to completely close the chassis opening 36.

In the shutter plate opening / closing mechanism 40 of this embodiment, the shutter plate 38 that closes the chassis opening 36 behind the shutter plate 38 is formed by the front portion 26a of the loading chassis 26 in which the chassis opening 36 is formed.
Is elastically pressed against the back of the device by the urging force of a torsion spring 228. Both swing levers 210 and 212 are also urged downward by the urging forces of the corresponding torsion springs 218 and 220. As a result, even if a foreign object is inserted from the chassis opening 36 during the loading operation of the disk cartridge 42, the shutter plate 38 only escapes against the urging force of the torsion springs 218, 220, 228. The loading operation locks on the way,
The situation where the shutter plate opening / closing mechanism 40 is damaged can be reliably avoided.

Next, (3) an automatic load / unload mechanism 52 for loading / unloading the disk cartridge 42 using the driving force of the drive motor 56, which is a characteristic configuration of this embodiment, is described in (4). With reference to FIGS. 38 to 46, a description will be given of a state in which a timing detection mechanism 60 for detecting timing such as loading timing in the automatic load / unload mechanism 52 is partially included.

This automatic load / unload mechanism 52
As shown in FIG. 38, the pair of left and right control cam plates 10
2, 104 and the “cartridge unload position” (P
Disc cartridge 4 manually inserted until 1)
2 and a pair of left and right control cam plates 10 arranged on the bottom plate 118d of the gear chassis 118.
And a drive mechanism 116 for moving and driving the second and the second drive 104. The timing detection mechanism 60 detects that the disk cartridge 42 is in the “cartridge insertion detection position”.
And the timing provided at the “cartridge loading position” (P3) and the timing provided at the “magnetic head loading position” (P4) by the magnetic head 14 can be detected. .

This driving mechanism 116 is shown in FIGS.
As shown in FIG. 7, a drive motor 56 mounted on the bottom plate 118d of the gear chassis 118, a detection / drive gear 234 which similarly configures a timing detection mechanism 60 described later, and a drive force of the drive motor 56 A slide plate drive mechanism 264 for moving and driving a slide plate 268 to which the engagement mechanism 232 is attached, based on the gear train 236 transmitted to the drive gear 234 and the driving force of the detection / drive gear 234.
And the driving force of the detection / drive gear 234 described above,
A control cam plate driving mechanism 280 for moving and driving the pair of left and right control cam plates 102 and 104 is schematically configured.

Hereinafter, the mounting structure of the drive mechanism 116 will be described in detail with reference to FIGS.

First, as shown in FIG.
The drive motor 56 described above is mounted on the bottom central portion 118d of the bottom plate 118d in the front central portion with its drive axis extending along a horizontal direction Y orthogonal to the insertion direction X. A worm gear 56a is provided on the motor shaft of the drive motor 56.
Has been fixed. Also, the bottom plate 1 of the gear chassis 118
In the left front part on 18d, three driven gears 238, 240, 242 constituting the gear train 236 (described later)
Are rotatably supported, respectively.
248 are planted. On the other hand, a shaft support pin 252 on which a detection lever 250 (to be described later) constituting the timing detection mechanism 60 to be described later is rotatably supported is implanted in a rear left portion on the bottom plate 118d of the gear chassis 118. . An arc-shaped first centered on the pivot pin 252 is located to the left of the position where the pivot pin 252 is implanted in the drawing.
Guide groove 254 is formed. Further, a detection / drive gear 234 is provided in front of the first guide groove 254.
A shaft support pin 256 is rotatably supported.

As shown in FIG. 43, driven gears 238, 240, 242 and a detection lever 250 are mounted on the structure shown in FIG.

That is, the first pin 244 has the first
The first driven gear 238 has a large-diameter worm wheel portion 238a that meshes with a worm gear 56a attached to the motor shaft of the drive motor 56, and a small-diameter flat gear 238. This is integrally formed with the gear portion 238b. In addition, a second driven gear 240 is rotatably supported on the pivot pin 246, and the second driven gear 240 is connected to the first driven gear 23.
8 is integrally formed with a large-diameter spur gear portion 240a meshing with the small-diameter spur gear portion 238b and a small-diameter spur gear portion 240b. A third driven gear 242 is rotatably supported by the shaft support pin 248, and the third driven gear 242 meshes with a small-diameter spur gear portion 240 b of the second driven gear 240. At the same time, it is configured to mesh with the large-diameter spur gear portion 234a of the detection / drive gear 234 described above.

The first to third driven gears 238, 240, 242 attached in this manner are connected to the gear train 236.
Is configured, and when the drive motor 56 is started,
Through this gear train 236, the detection / drive gear 23
4 is driven to rotate.

On the other hand, the above-described detection lever 250 is rotatably supported by the above-mentioned pivot pin 252 in a state of being located below the bottom plate 118c of the gear chassis 114. The detection lever 250 is formed in a substantially T-shape in plan view, and is rotatably supported by a shaft support pin 252 at a right shoulder of the T-shape. Also, this detection lever 250
The torsion spring 258 wound around the pivot pin 252 urges the anti-clockwise rotation in the figure. Here, on the left shoulder of the T-shaped detection lever 250, a detection target detected by a third detection sensor 260 (indicated by a dashed line in the figure) constituting a timing detection mechanism 60 described later. The piece 250a is integrally provided with the piece 250a standing upright and being taken out above the bottom plate 118c of the gear chassis 114. The first guide groove 254 described above is provided on the lower end of the T-shape of the detection lever 250.
Through the bottom plate 118 of the gear chassis 118.
A driven pin 262 that is taken out above c is implanted.

When the driven pin 262 is positioned at the front end of the first guide groove 254 by the urging force of the torsion spring 258, the "cartridge unload position" is set.
(P1) is defined, and the detection target piece 250a of the detection lever 250 to which the driven pin 262 is attached is set so as to deviate forward from the detection range of the third detection sensor 260 and to turn on the third detection sensor 260. ing. The driven pin 262 resists the urging force of the torsion spring 258,
When the detection lever 250 slightly moves backward from the front end of the first guide groove 254 (that is, the detection lever 250 slightly rotates clockwise), the “cartridge insertion detection position” is defined,
The detection lever 250 to which the driven pin 262 is attached
Is set so as to enter the detection range of the third detection sensor 260 and turn it off. Further, the driven pin 262 is connected to the first guide groove 2.
54, the driven pin 262
Detected piece 250a of detection lever 250 to which is attached
Is set so as to deviate backward from the detection range of the third detection sensor 260 and to turn it on. still,
With the driven pin 262 located at the rear end of the first guide groove 254, the magnetic head 16 is set to be brought to the "magnetic head loading position" (P4).

On the structure shown in FIG. 43, as shown in FIG.
0, a slide plate 264 to be described later.
Is reciprocated in the insertion direction X, and the disk cartridge 42 engaged with the slide plate 264 via the engagement mechanism 232 described below is moved between the “cartridge insertion detection position” and the “cartridge retraction completion position” (P2). A pull-in link 266 constituting a slide plate drive mechanism 264 for reciprocating between them is attached. The pull-in link 266 functions as a detection lever for detecting that the disk cartridge 42 has been inserted from the “cartridge unload position” (P1) to the “cartridge insertion detection position”. It is configured to also function as a unit.

Specifically, the above-described pull-in link 266 is described.
Is formed in a substantially T-shape in plan view, and is rotatably supported by the above-described shaft support pin 252 at the right shoulder of the T-shape. On the left shoulder of the T-shaped link 266,
A forked portion 266a is formed. As shown in FIG. 18, the forked portion 266a has a pin 270 embedded in a slide plate 268 that is moved in the insertion direction X with the insertion operation of the disk cartridge 42. Are engaged in a state of being embraced. That is, according to the sliding movement of the slide plate 268, the pull-in link 266 is driven to rotate around the pivot pin 252.

Here, this slide plate 268 is
As shown in FIG. 18, the cartridge holder 100 is slidably disposed along the insertion direction X on the left side of the top plate 100a. The rear end of the cartridge holder 100 is bent downward and inserted. The engaging piece 268a is engaged with the leading end of the coming disk cartridge 42. This engagement piece 268
When the slide plate 268 is at a position corresponding to the “cartridge unload position” (P1), the leading end of the disk cartridge 42 does not come into contact with the “a”, and the disk cartridge 42 is moved to the “cartridge unload position” (P1).
When the disk cartridge 42 is further inserted past 1), the leading end of the disk cartridge 42 comes into contact with the disk cartridge 42, and with the insertion operation,
Pushing and driving is performed in the insertion direction X, and as a result, the slide plate 268 is slid backward in the insertion direction X.

On the other hand, at the rear end of the slide plate 268, when the disc cartridge 42 inserted up to the "cartridge unloading position" (P1) is inserted up to the "cartridge insertion detecting position", the disc cartridge 42 is inserted. And an engagement mechanism 232 is provided for engaging the motor with the driving force of the driving motor 56 so as to make the state further retracted (that is, automatically loaded). The engagement mechanism 232 includes a pivot pin 272 that is planted on the lower surface of the rear end of the slide plate 268 and a cartridge hook 274 that is rotatably supported by the pivot pin 272. It is provided with. The cartridge hook 274 is formed in a substantially L-shape in plan view, and is pivotally supported by a pivot pin 272 at a bent portion thereof. In addition, the cartridge hook 274 is set so that one piece 274a can contact the disk cartridge 42.
The other piece 274b extends forward from the shaft support, and is formed so that its tip can be engaged with the hook groove 42e of the disk cartridge 42 shown in FIGS. And this cartridge hook 274
The other piece 274b is rotatable between an engaging position where the other piece 274b engages with the hook groove 42e of the disk cartridge 42 and a retracting position where it does not engage.

Here, the distal end surface of the other portion 274b of the cartridge hook 274 is formed as a tapered surface. Even when this is at the engagement position, the distal end portion of the inserted disk cartridge 42 is formed. It is set so that it is pushed to the left end portion and once turned to the outward retreat position. In this state, the other end 274b of the cartridge hook 274 is provided with a clearance sufficient to allow the disc cartridge 42 to pass by the side of the tip of the disc cartridge 42 while being rotated to the retracted position. In order to secure between the inclined surfaces 42c and 42d formed on the side surfaces of the cartridge holder 100, a corresponding side plate 100c of the cartridge holder 100 is formed with a side opening 100g through which the other piece 274b of the cartridge hook 274 passes. I have.

The disc cartridge 42 that has once passed the side of the cartridge hook 274 rotated to the retracted position contacts the one end 274a of the cartridge hook 274 with the left end of the distal end thereof. The slide plate 268 is rotated from the retracted position to the engagement position, and is brought into contact with the engagement piece 268a of the slide plate 268.
68 is slightly pushed and moved (slid) along the insertion direction X. As a result, the cartridge hook 274
The other piece 274b is engaged with the hook groove 44e, and the cartridge hook 274 and the disc cartridge 42 move integrally along the insertion direction X. When the cartridge hook 274 engages with the disk cartridge 42 and is slightly pushed in the insertion direction in this manner, the outer surface of the other piece 274b of the cartridge hook 274 becomes the above-described side. Out of the opening 100g, by the inner surface of the side plate 100c,
The movement to the evacuation position is prohibited. Accordingly, in response to the movement driving of the cartridge hook 274, the state in which the cartridge hook 274 is engaged with the disk cartridge 42 is maintained, and the disk cartridge 42 is moved along the insertion direction X into the “cartridge retraction completion position” (P2 ) Can be driven by pulling in (automatic loading).

That is, as described above, the manually inserted disk cartridge 42 is inserted into the cartridge hook 2 at the "cartridge unload position" (P1).
As the disc cartridge 42 is further manually inserted from the “cartridge unloading position” (P1) to the “cartridge insertion detection position”, the cartridge hook 274 is moved from the retracted position. By rotating the cartridge hook 274 to the engaging position to engage the cartridge hook 274 with the disk cartridge 42 and engaging the pin 270 implanted in the slide plate 268, the pull-in link 266 is slightly clockwise in FIG. To rotate. In response to the clockwise movement of the pull-in link 266, the side edge thereof engages with the above-described detected piece 250a of the detection lever 250, and this detected piece 2
The detection lever 250 to which 50a is integrally attached is
It is slightly rotated clockwise against the urging force of the torsion spring 258.

As a result, as described above, the third detection sensor 260 changes its detection state from the on-state to the off-state, and details thereof will be described later.
With the change from the ON state to the OFF state, the control circuit determines that the disk cartridge 42 has been inserted to the “cartridge insertion detection position”, activates the drive motor 56, and slides through the slide plate drive mechanism 264. The plate 268 is driven to move in the insertion direction X by the driving force of the driving motor 56, and thus the cartridge hook 2
By moving the cartridge 74, the disk cartridge 42 is pulled into the "cartridge retraction completion position" (P2) in the cartridge holder 100 at the "cartridge receiving position".

Here, the slide plate driving mechanism 264
44, in addition to the above-described retracting link 266, as shown in FIG. 44, a drive pin 276 erected at the lower end of the T-shape of the retracting link 266, and as shown in FIG. A drive cam groove 278 is formed on the lower surface, and the drive pin 276 is fitted from below. That is, the detection gear 234 is rotationally driven by the driving force of the driving motor 56 via the gear train 236 described above, and based on a change in the engagement position between the driving cam groove 278 and the driving pin 276, the pull-in link 266 is The pull-in link 2 is driven to rotate in a clockwise direction.
The slide plate 268 to which the pin 270 engaged with the slide 66 is attached is slid along the insertion direction X. Therefore, in response to the sliding drive of the slide plate 268, the cartridge hook 27 attached thereto is mounted.
4 is inserted in the insertion direction X.
Along with the “cartridge retraction completion position” (P2).

After the retraction operation by the slide plate driving mechanism 264, the pair of left and right control cam plates 102 and 104 is further moved and driven via the control cam plate driving mechanism 280, as described later. By lowering the cartridge holder 100 from the "cartridge receiving position" to the "cartridge loading position" (P3), the disk cartridge 42 can be automatically loaded.

Next, the left and right control cam plates 102 and 104 are moved and driven by the driving force of the drive motor 56, whereby the cartridge holder 100 is moved to the "cartridge receiving position" and the "cartridge loading position" (P3) of the disk cartridge 42. ), And the control cam plate driving mechanism 280 for moving the magnetic head mounting base 62 up and down between the “standby position” of the magnetic head 14 and the “magnetic head loading position” (P4). The configuration will be described.

First, the control cam plate driving mechanism 280
As shown in FIG. 38 again, the bottom plate 11 of the gear chassis 118 is
A link arm 284 that is rotatably supported at a center position thereof via a support pin 282 at a substantially central portion of 8d and is engaged with a pair of left and right control cam plates 102 and 104 at both ends, and the detection / detection described above. A transmission arm assembly 286 that transmits the rotation of the drive gear 234 to the link arm 284 so that the rotation can be released.
And the magnetic head 14 is moved to the "magnetic head load position" (P
The link arm 284 moved so as to be located in 4) is
Forced return mechanism 2 for forcibly returning to "middle position"
88. Here, the forcible return mechanism 288 uses the electromagnetic force to determine the rotational position of the link arm 284 that has moved the magnetic head mounting base 62 so that the magnetic head 14 is located at the “magnetic head load position” (P4). Solenoid 2 that is held releasably
90.

The structure of the control cam plate drive mechanism 280 will be described below with reference to FIG. 38 and FIGS. 42 to 46.

First, as shown in FIG. 42, the gear chassis 1
The link arm 284 described above is provided on the lower surface of the bottom plate 118d of the base plate 18 via a pivot pin 282 at the center thereof.
8d is rotatably supported at a substantially central portion thereof. At both ends of the link arm 284, a pair of left and right control cam plates 10 are provided.
Engagement pins 292a and 292b that fit into the engagement recesses 102e and 104e of the pair 2 and 104 from below are attached so as to protrude upward. In this way, the pair of left and right control cam plates 102 and 104 are driven to move in opposite directions.

On the other hand, the bottom plate 118d of the gear chassis 118
The above-mentioned electromagnetic solenoid 290 is mounted on the right rear portion of the vehicle with its attraction surface 290a facing right. In addition, a second guide groove 294 having a long arc shape around a pivot pin 282 that rotatably supports the link arm 284 is provided on the right portion of the bottom plate 118 d of the gear chassis 118. An arc-shaped third guide groove 296 shorter in diameter and shorter than the groove 294 is formed. Here, a drive pin 298 is implanted on the link arm 284 while penetrating the second guide groove 294 from below. Therefore, this drive pin 298
Is slided in the second guide groove 294, whereby the link arm 284 is driven to rotate around the pivot pin 282. In other words, the rotation range of the link arm 284 is restricted at the front and rear ends of the second guide groove 294. Further, the bottom plate 118d of the gear chassis 118
A shaft support pin 302 on which a solenoid arm 300 to be described later is rotatably supported is planted in the right front part of the vehicle.

On the structure shown in FIG. 42, as shown in FIG. 43, the above-described solenoid arm 300 and the eject arm 304 constituting the forced return mechanism 288 are attached.

That is, the gear chassis 11 is attached to the shaft support pin 282 for rotatably supporting the link arm 284 described above.
The eject arm 304 is rotatably supported in a state of being positioned on the bottom plate 118d of No. 8. The lower surface of the eject arm 304 is provided with the third guide groove 29 described above.
A guide pin 306 inserted from above is implanted in 6. A solenoid arm 300 is rotatably supported at the front end of the shaft support pin 302 at the front end thereof. The rear end of the solenoid arm 300 extends to the vicinity of the electromagnetic solenoid 290 described above. At the rear end of the solenoid arm 300, the suction piece 3 which is attracted by the electromagnetic solenoid 290 being excited is excited.
00a is attached.

This solenoid arm 300 is
A torsion spring 308 wound around 02 applies counterclockwise rotation in the figure. Therefore, even when the electromagnetic solenoid 290 is demagnetized, the solenoid arm 300 is urged to rotate toward the electromagnetic solenoid 290 by the urging force of the torsion spring 308. In the state where the electromagnetic solenoid 290 is demagnetized, the left side surface of the solenoid arm 300 except for a locking portion 300b formed in a recessed front portion thereof (described later in detail) is provided. Link arm 2
In a state in which the driving pin 298 implanted in 84 is elastically brought into contact with the above-described biasing force of the torsion spring 308, the suction piece 300 a is attached to the suction surface 290 a of the electromagnetic solenoid 290.
It is separated from.

That is, at the front of the solenoid arm 300, the “magnetic head load position” (P
In order to lock the drive pin 298 implanted on the link arm 284 rotated so as to define 4) at the position which defines the "magnetic head load position" (P4), in other words, the link A locking portion 300b is formed in a step shape to prevent the arm 284 from returning from the position defining the “magnetic head loading position” (P4) of the magnetic head 14 to the position defining the “intermediate position”. ing.

Then, the drive pin 298 moves forward along the second guide groove 294, and the solenoid arm 30
In the state where the solenoid arm 300 is brought to the locking portion 300b, the engagement between the left side surface of the solenoid arm 300 and the drive pin 298 is released, and the solenoid arm 300 is rotated counterclockwise in the drawing by the urging force of the torsion spring 308. Then, the suction piece 300a comes into mechanical contact with the suction surface 290a of the electromagnetic solenoid 290. In this contact state, the electromagnetic solenoid 2
When the drive pin 298 is demagnetized, the locking portion 300b is pressed with the return operation of the drive pin 298, and the solenoid arm 300 formed with the lock portion is rotated clockwise against the urging force of the torsion spring 308. , In this way, again,
The state returns to the state where the drive pin 298 is engaged with the left side surface of the solenoid arm 300.

On the other hand, by attracting the attraction piece 300a in response to the excitation of the electromagnetic solenoid 290, the solenoid arm 300 is added to the urging force of the torsion spring 308 and further has an electromagnetic attraction force.
0 is strongly sucked to the suction surface 290a, and the rotation position is fixed. As a result, in this suction state, the drive pin 298 is locked by the locking portion 300b of the solenoid arm 300, and the rearward movement is prohibited, that is, the link arm 284 is moved to the “magnetic head load position” (P4 ) Is prevented from returning to the position defining the “intermediate position”.

A gear arm 310 constituting a transmission arm assembly 286 is mounted on the configuration shown in FIG. 43 while riding on the eject arm 304 as shown in FIG. This gear arm 310
Is pivotally supported by the above-described pivot pin 282 at a substantially central portion thereof. At the left end of the gear arm 310 in the figure, a fan-shaped gear portion 310a that meshes with the small-diameter spur gear portion 234a of the detection / drive gear 234, which is taken out in FIG. on the other hand,
The right end 310b of the gear arm 310 in the drawing extends in front of the drive pin 298 implanted in the link arm 284 and extends to a position covering the second guide groove 294 described above. A shaft support pin 314 for rotatably supporting the lock arm 312 constituting the transmission arm assembly 286 is implanted on the right end 310b.

As shown in FIG. 38 again, a lock arm 312 is mounted on the gear arm 310 shown in FIG. 44 so as to be rotatably supported by a shaft support pin 314. The lock arm 312 is urged by a torsion spring 316 wound around the pivot pin 314 to rotate clockwise in the drawing. Here, the lock arm 312 is formed in a substantially L shape in plan view, and is pivotally supported by the pivot pin 314 at a bent portion thereof. A recess 312b into which the drive pin 298 is removably fitted is formed on the right side of the base end of one of the pieces 312a extending rearward in the loading direction X of the lock arm 312. ing.

Here, in a state where no external force acts on the lock arm 312 and the lock arm 312 is rotated clockwise by the urging force of the torsion spring 316, the recess 312b
Is set so that the drive pin 298 is fitted therein.
Then, in this fitted state, the lock arm 312 is set to be brought into a state of being engaged with the drive pin 298 in the rotation direction of the link arm 284 (ie, a state of locking the drive pin 298). Note that this recess 312
The surface defining the front side edge of the gear arm 3
It is set so as to be substantially aligned in the vertical direction with the rear end face of the right end portion 310b of the ten.

As a result, the concave portion 31 of the lock arm 312
In a state where the drive pin 298 is fitted in the gear arm 2b, the gear arm 310 to which the lock arm 312 is attached is
By rotating clockwise from the state shown in the figure around the pivot pin 282, the link arm 284 to which the drive pin 298 is attached is driven to rotate clockwise. That is, the driving force of the driving motor 56 is transmitted to the link arm 284 via the transmission arm assembly 286 described above, whereby the pair of left and right control cam plates 102 and 104 is transmitted.
Are driven to move in opposite directions.

On the other hand, the other piece 312c of the above-described lock arm 312 is formed so as to be able to abut on the above-mentioned pivot pin 302. Specifically, the drive pin 298 is set to abut on the pivot pin 302 immediately before the drive pin 298 reaches the front end of the second guide groove 294 in a state where the gear arm 310 is rotated clockwise. Thus, the other piece 31
After the contact of the gear arm 2c with the pivot pin 302, the gear arm 310 further rotates clockwise, and the drive pin 298 reaches the front end of the second guide groove 294. Is rotated counterclockwise against the urging force of the above, whereby the engagement state between the concave portion 312b and the drive pin 298 is released. When the engagement between the concave portion 312b and the drive pin 298 is released, the drive pin 298 is in a state where the drive pin 298 can return, in other words, the link arm 284 to which the drive pin 298 is attached is rotated counterclockwise. It becomes a state that can be rotated.

Here, when the supply of power to the magneto-optical disk device 10 is stopped due to a power failure or the like, the drive of the spindle motor 44 is stopped, and as a result, the magneto-optical disk 12 in the disk cartridge 42 is stopped. The rotation stops. As described above, the magnetic head 14 is set to be separated from the surface of the magneto-optical disk 12 while being slightly lifted by the wind pressure generated when the magneto-optical disk 12 rotates. Accordingly, when the drive of the spindle motor 44 is stopped and the rotation of the magneto-optical disk 12 starts to gradually decrease, the effect of the wind pressure is weakened. As a result, the magnetic head 14 drops due to the load beam load, and the magneto-optical disk 12 still rotating due to inertia.
May be damaged by contacting the surface. For this reason, in this embodiment, when the power supply is stopped due to a power failure or the like in the magneto-optical disk device 10, the magnetic head 14 is moved to the "magnetic head load position" (P4) by utilizing the spring force. A forced return mechanism 288 configured to be lifted in a state where it has been mechanically forcibly returned to the "intermediate position" is provided.

That is, the forcible return mechanism 288 includes the electromagnetic solenoid 290 described above and the eject arm 304
And the eject arm 304 and the electromagnetic solenoid 2
And a return spring 318 that urges the eject arm 304 to rotate counterclockwise around the pivot pin 282. Specifically, on the lower surface of the eject arm 304, an eject pin 320 penetrating the above-described third guide groove 288 downward is implanted in a state of falling. The eject pin 320 is engaged with a link arm 284 that has been driven to rotate clockwise.
The eject arm 304 to which the “0” is attached is rotated clockwise against the urging force of the return spring 318.

Here, in a state where the eject pin 320 is forcibly held at the front end position of the third guide groove 296 by the link arm 284 against the urging force of the return spring 318, the link arm 284 moves the eject pin 320. The position of the pair of left and right control cam plates 102 and 104 is defined as the motor stop position, and the magnetic head 14 is set at the “magnetic head loading position” (P4).
0 is positioned at the "cartridge loading position" (P3), and the return spring 318 is charged with an urging force for forcibly returning the magnetic head 14 from the "magnetic head loading position" (P4) to the "intermediate position". Is set to On the other hand, when the holding force for holding the link arm 284 at the front end position of the third guide groove 296 is cancelled, the eject pin 320 is moved to the third guide groove by the biasing force of the charged return spring 318. 296 will be rotated to the rear end position. Here, the link arm 284 engaged with the eject pin 320
Is also rotated similarly. As described above, the pair of left and right control cam plates 102 and 104 defined by the link arm 284 engaged with the eject pin 320 that has returned to the rear end position of the third guide groove 296 moves the magnetic head 14 to the “middle position”. It is positioned so that it is regulated.

On the other hand, as described above, the link arm 284
Is set so that the lock of the drive pin 298 by the lock lever 312 is released when the drive pin 298 implanted in the second guide groove 294 is moved to the front end of the second guide groove 294. The arm 284 is forcibly returned to the position corresponding to the "intermediate position" by the urging force of the return spring 318. For this reason, in this embodiment, the forced return mechanism 288 is
2 before the drive pin 298 is unlocked by
The electromagnetic solenoid 290 is excited, and the solenoid arm 300 is rotated and urged in the counterclockwise direction while being applied to the urging force of the torsion spring 308. As a result, the solenoid arm 300 abuts on the drive pin 298 from the side, and the drive pin 298 is moved to the “magnetic head load position”.
Until the position immediately before the position corresponding to (P4), the solenoid arm 300 moves while sliding on the left edge. When the drive pin 298 moves to a position corresponding to the “magnetic head load position” (P4), the drive pin 298 faces the locking portion 300b of the solenoid arm 300, and the suction piece 300a of the solenoid arm 300 moves to the electromagnetic solenoid 29.
The torsion spring 308 is rotated with the urging force applied so as to be attracted to the zero attraction surface. In the state where the solenoid arm 300 is attracted by the electromagnetic solenoid 290 in this manner, the drive pin 298 replaces the concave portion 312 of the lock lever 312 with the solenoid arm 30.
The state of being locked to the front end of the second guide groove 294 is maintained by the zero locking portion 300b.

That is, in the control cam plate drive mechanism 280 of this embodiment, the drive pin 298 implanted in the link arm 284 for engaging and moving the pair of control cam plates 102, 104 Until the magnetic head 14 is moved from the position corresponding to the “standby position” to the position corresponding to the “magnetic head load position” (P4) through the position corresponding to the “intermediate position”, the drive motor 56 rotates the shaft. A lock arm 312 attached to a gear arm 310 rotated around the support pin 282 is locked so as to rotate integrally with the gear arm 310, and the drive pin 298 causes the magnetic head 14 to move to the "magnetic head load position". 』
In the state brought to the position corresponding to (P4), the locked state by the lock arm 312 is released, and instead,
Locking is performed by the solenoid arm 300 firmly held at the locking position by the excited electromagnetic solenoid 290.

Therefore, the forced return mechanism 28 of this embodiment is
According to FIG. 8, the state in which the magnetic head 14 is locked at the “magnetic head loading position” (P4) by the solenoid arm 300 is maintained as long as the electromagnetic solenoid 290 is excited. When the power supply is stopped due to a power failure or the like, the electromagnetic solenoid 190 is automatically demagnetized, and as a result, the solenoid arm 30
0 is returned to a state where the rotation is urged counterclockwise only by the urging force of the torsion spring 308. As a result, the locked state of the drive pin 298 is substantially released by this demagnetization. In this way, the magnetic head 14 moves the link arm 284 to the “magnetic head load position”.
As shown in (P4), the holding force for holding the link arm 284 is released. Therefore, the link arm 284 is pressed by the eject arm 304 to which the eject pin 320 abutting is attached. As a result, the rotation is returned in the counterclockwise direction. With the return of the rotation of the link arm 284, the magnetic head 14 is forcibly returned from the "magnetic head load position" (P4) to the "intermediate position".

In the automatic loading / unloading mechanism 52 configured as described above, the disk cartridge 42 loaded at the "cartridge loading position" (P3) in the magneto-optical disk device 10 is unloaded. In this case, the drive motor 56 is driven to rotate in the direction opposite to the loading direction (reverse rotation), so that the disk cartridge 42 can be pulled out by the drive force of the drive motor 56 to the “cartridge unload position” (P1). You can do it.

As described in detail above, after the "cartridge unload position" (P1) shown in FIG. 33, the "cartridge insertion detection" The automatic load / unload mechanism 52 is activated by manually inserting the disk cartridge 42 up to the “position”. The automatic loading / unloading mechanism 52 activated in this manner causes the disc cartridge 42 to
From the “cartridge insertion detection position” to the “cartridge loading position” (P3), the cartridge is automatically loaded by the driving force of the driving motor 56.

Therefore, it is not necessary for the operator to manually insert the entire disk cartridge 42 into the magneto-optical disk device 10, and the magneto-optical disk cartridge 42 is automatically retracted after being inserted halfway. The operability of loading the cartridge 42 is extremely good. Also, the “cartridge loading position” (P
At the time of unloading from 3), it is automatically unloaded from here to the “cartridge unload position” (P1) by the driving force of the drive motor 56. As a result, the operator only has to hold the disk cartridge 42 that has been partially pulled out and operate it so that it is pulled out, and the operability of the unloading operation is significantly improved.

In particular, in the loading operation, the cartridge hook 274 is
Is engaged with the hook groove 42e of the disk cartridge 42 from the side, so that the engagement state of the disk cartridge 42 at the time of loading is assured. As a result, this loading operation is executed in an extremely stable state. Will be.

In particular, in the unloading operation, the driving force of the driving motor 56 is used.
The disk cartridge 42 is surely unloaded to the "cartridge unload position" (P1),
For example, as compared with the case of unloading using the spring force, the disk cartridge 42
There is also a fear that it will not be discharged from 6,
The entire disk cartridge 42 is pulled out from the chassis opening 36, and there is no danger that the disk cartridge 42 falls on the floor and is damaged.
An extremely stable discharging operation is achieved.

Next, a description will be given of (4) the timing detection mechanism 60 for detecting the loading timing of the disk cartridge 42 and the loading timing of the magnetic head 14 having the above-mentioned characteristic configuration with reference to FIGS.

First, the configuration of the detection / drive gear 234, which is also defined as a component of the drive mechanism 116, will be described in detail with reference to FIG.

That is, as shown in FIG. 46, the detection / drive gear 234 is rotatably supported by the above-described support pin 256 and serves as a portion functioning as the drive mechanism 116. A large-diameter gear portion 234b that meshes with the third driven gear 248 is provided around the outermost periphery. Through this meshing, the forward driving force of the drive motor 56 causes the detection / drive gear 234 to rotate counterclockwise in FIG. 38, and the rotation force of the detection / drive gear 234 becomes
In the automatic load / unload mechanism 52, the drive cam groove 278 of the slide plate drive mechanism 264 and the drive pin 276
Is transmitted to the slide plate 268 via the pull-in link 266, and transmitted to the link arm 284 via the transmission arm assembly 286 in the control cam plate drive mechanism 280.

On the other hand, on the upper surface of the detection / drive gear 234, the parts functioning as the timing detection mechanism 60 include a "cartridge insertion detection position", a "cartridge loading position" (P3), and a "magnetic head loading position" (P3).
In order to detect 4), first and second detection ribs 322,
324 are each standing from the top surface, and
It is formed in a state of having an arc shape centering on the pivot pin 256. Here, the first detection rib 322 is provided on the outer periphery,
Further, the second detection ribs 324 are disposed on the inner circumference, respectively, and a slit 322 a is formed at a predetermined position of the first detection rib 322.

The timing detection mechanism 60 includes first and second detection sensors 326 and 328 in addition to the third detection sensor 260 described above.
6, 328 are set to be in the on state unless the first or second detection ribs 322, 324 corresponding to the respective detection ranges enter. In other words, the first detection sensor 326 sets the first detection rib 32 in its detection range.
2, the second detection sensor 328 is set to be turned off when the second detection rib 324 enters the detection range thereof. Note that the above-described slit 322a is caused by rotation of the detection / drive gear 234,
When this enters the detection range of the corresponding first detection sensor 326, the first detection sensor 326 is turned on for a predetermined time, for example, about 20 ms in this embodiment.
It is set to turn on about ec.

Here, the first detection rib 322 is located at the position corresponding to the “cartridge insertion detection position”.
The detection sensor 326 is turned on, and the detection and
The first detection sensor 326 is turned off only until the magnetic head 14 is brought to a position corresponding to the “magnetic head load position” (P4) from the time when the drive gear 234 slightly rotates counterclockwise. Is set to The formation position of the above-mentioned slit 322a is thereby changed to the first position.
Is set so as to correspond to a timing appropriate for demagnetizing the electromagnetic solenoid 290 in the unloading operation. On the other hand, the second detection rib 324 performs detection and detection from a position corresponding to the “cartridge unload position” (P1) to a position corresponding to the “cartridge load position” (P3).
While the drive gear 234 is rotated, the second detection sensor 32
8 is turned on, and the “cartridge loading position” (P
It is set to be turned off at the timing of 3).

The third detection sensor 260 described above
Has already been described so as to be turned on / off based on the detected piece 250a of the detection lever 250. In particular, the detected piece 250a is pushed by the pull-in link 266, and the "cartridge unload position" (P1) Is moved from the position corresponding to "Cartridge retraction completed position" (P2) to the position corresponding to "Cartridge unload position".
It has already been described that the third detection sensor 260 is turned off with the movement from (P1) to the “cartridge insertion detection position”. Here, a link arm 284 that is rotationally driven by the operation of the control cam plate driving mechanism 280 described above is attached to the driven pin 262 of the detection lever 250 that has been moved to a position corresponding to the “cartridge loading position”. When the magnetic head is rotated clockwise until immediately before the rotation position corresponding to the magnetic head loading position ”(P4), the contact is made, and the driven pin 262 is driven to rotate clockwise. I have. Thus, the detected piece 250a of the detection lever 250 to which the driven pin 262 is attached is
When the link arm 284 is in the “magnetic head load position” (P
With the movement to 4), the third detection sensor 260 comes out of the detection range and is turned on.

Here, as shown in FIG. 40, the first to third two detection sensors 326, 328, and 260
It is mounted on the lower surface of the synchro servo board 120 while being directly mounted on a synchro servo circuit (not shown). In this timing detection mechanism 60, the detection / drive gear 234 is moved to the “cartridge unload position” using the first and second detection sensors 326 and 328.
(P1), “cartridge loading position” (P3),
The setting is such that a position corresponding to any one of the three positions "magnetic head load position" (P4) is detected. Then, the first and second detection sensors 3
When the third detection sensor 260 is turned off in a state where the detection / drive gear 234 is detected to be at the position corresponding to the “cartridge unload position” (P1) by 26 and 328, the disk cartridge 42 is inserted, that is, , The timing at which the disk cartridge 42 is brought to the “cartridge insertion detection position”. Further, the first and second detection sensors 326, 3
When the third detection sensor 260 is turned off in a state where the detection / drive gear 234 is detected to be at the “magnetic head load position” (P4), the “magnetic head load position” (P4) of the magnetic head 14 is detected. It is set to detect the start timing of the unloading operation from.

As described above, the “cartridge insertion detection position” of the disk cartridge 42 is determined by the disk cartridge 4 inserted manually by the operator.
2 is the “cartridge unload position” (P1)
Abuts on the engaging portion 268a of the slide plate 268 at
This is slightly pushed in the loading direction X, and the pushing movement of the slide plate 268 causes the retraction link 266 to rotate, and the detection lever 250 rotates in response to the rotation of the retraction link 266, and the detection lever 250 The detection target piece 250a is detected by turning off the third detection sensor 260 in accordance with the rotation of. On the other hand, according to the rotation of the detection / drive gear 234, the drive cam groove 278 formed on the lower surface of the detection / drive gear 234 and the pull-in link 2
When the position of engagement with the drive pin 276 implanted in the 66 changes, the retraction link 266 is rotated, and the slide plate 268 is moved in accordance with the rotation of the retraction link 266, whereby the above-described operation is performed. After the insertion detection timing, the load is automatically performed by the driving force of the driving motor 56. However, at the time of the above-described insertion detection, since the drive motor 56 has not been started, the detection / drive gear 234 cannot rotate due to the configuration of the gear train 236 described above.

For this reason, in this embodiment, for example,
Even if the detection / drive gear 234 is not rotatable due to the non-activation of the drive motor 56, the pull-in link 26
In other words, in order to allow the rotation of the pull-in link 6, the pull-in link 2
The drive pin 276 implanted in the drive 66
The torsion is wound around a cylindrical boss 234c formed coaxially with the center of rotation on the upper surface of the detection / drive gear 234 to allow movement within the drive cam groove 278 formed on the lower surface of the drive gear 34. A spring 330 is provided. The torsion spring 330 has one end 330 as shown in FIG.
a is locked to the detection / drive gear 234 at the other end 330b.
Is elastically in contact with the clockwise end surface of the recess 234d formed between the outer periphery of the boss 234c and the inner periphery of the first detection rib 322. The driving pin 276 described above is set in a state in which it contacts the other end 330b of the torsion spring 330.

In this manner, the disk cartridge 42
"Cartridge unload position" for insertion detection
The movement of the drive pin 276 accompanying the clockwise rotation of the pull-in link 266 around the pivot support pin 252 from (P1) to the “cartridge insertion detection position” simply causes the other end 330b of the torsion spring 330 to elastically move. By simply deforming in the counterclockwise direction, the detection / drive gear
4 will not be affected. On the other hand, in response to the activation of the drive motor 56 after the detection of the insertion of the disk cartridge 42, the detection / drive gear 234 is driven to rotate counterclockwise, but in response to the rotation of the detection / drive gear 234. The drive pin 276 is moved based on the cam surface shape of the drive cam groove 278, and the drive link 266 in which the drive pin 276 is implanted is connected to the support pin 2.
It is driven to rotate clockwise around 52.

The timing detection operation of the timing detection mechanism 60 configured as described above will be described with reference to FIGS.
And the operation state diagrams shown in FIGS. 54 to 79 will be described.

First, in each of the timing charts shown in FIGS. 47 to 53, "PS-A" indicates a detection signal from the first detection sensor 326, and "PS-B" indicates a detection signal from the second detection sensor 328. The detection signal is "PS-C"
Respectively indicate the detection signals from the detection sensor 260.
In the same figure, "SOLE" indicates a control signal to the electromagnetic solenoid 290, and is set so that the electromagnetic solenoid 290 is demagnetized when turned off and excited when turned on. Also, in the same figure, “LDA” and “LDB” indicate control signals to the drive motor 56. When “LDA” is “L” and “LDB” is “H”, the drive motor 56 Rotate in the forward direction (forward rotation)
When “A” is “H” and “LDB” is “L”, the drive motor 56 rotates (reversely) in the direction opposite to the forward direction, and “LD”
When both "A" and "LDB" are "H", the drive of the drive motor 56 is set to be stopped.

FIG. 47 shows the state during the loading operation of the disk cartridge 42, that is, the pair of left and right control cam plates 10.
2 shows a timing detection state at the time of moving 2,104 from a position corresponding to the “cartridge unload position” to a position corresponding to the “cartridge load position” (P3).

That is, the magneto-optical disk cartridge 4
During the loading operation of No. 2, the pair of left and right control cam plates 102 and 104 are in the “cartridge unload position”.
And the first and second detection sensors 32
When the third detection sensor 260 is turned off in a state where both the disc cartridges 42 and 328 are turned on, the disc cartridge 42 is manually inserted by the operator, that is, the disc cartridge 42 is moved to the “cartridge unload position”. "
It is detected that it has been brought to the “cartridge insertion detection position” slightly inserted from (P1). With this cartridge insertion detection, the drive motor 56 rotates forward. When the detection / drive gear 234 is rotationally driven in accordance with the forward rotation of the drive motor 56, first, the first detection rib 322 enters the detection range of the first detection sensor 326, whereby the first detection sensor 326 is turned off. After that, the second detection rib 324 enters the detection range of the second detection sensor 328 by the rotation of the detection / drive gear 234, so that the second detection sensor 328 is turned off. When the second detection sensor 328 is turned off, the disk cartridge 4
2 is automatically loaded by the automatic loading / unloading mechanism 52 to the "cartridge loading position" (P3), that is, completion of cartridge loading is detected. With the completion detection of this cartridge loading,
The normal rotation operation of the drive motor 56 is stopped.

More specifically, in a cartridge unload state where insertion of the disk cartridge 42 has not been detected, the automatic load / unload mechanism 52, the timing detection mechanism 60, and the control cam plate drive mechanism 280 operate as shown in FIG.
The state shown in FIG. In this cartridge unloading state, the first to third detection sensors 32
6, 328 and 260 are on. When the disk cartridge 42 is manually inserted into the magneto-optical disk device 10 through the chassis opening 36 as shown in FIGS. At 40, the shutter plate 38 is simply pushed by the magneto-optical disk 12 to be inserted, rotates backward against the urging force of the torsion spring 228, and allows the magneto-optical disk 12 to be inserted.

Then, the leading end of the magneto-optical disk 12 passes through the "cartridge unload position" (P1) where it comes into contact with the engaging piece 268a of the slide plate 268.
8a is further pushed in to drive the detection lever 25.
0, thereby turning off the third detection sensor 260. When the third detection sensor 260 is turned off, the disk cartridge 42 is brought to the “cartridge insertion detection position”, that is, the insertion of the disk cartridge 42 is detected. Then, based on the detection of the insertion, the control circuit starts the drive motor 56 of the automatic load / unload mechanism 52 and rotates the drive motor 56 forward to start the automatic loading operation of the disk cartridge 42.

The "cartridge unload position"
The internal structure of the magneto-optical disk device 10 at (P1) is shown in FIG.
FIG. 60 shows the right side shape, and FIG. 69 shows the front side shape. At the "cartridge unload position" (P1), as shown in a front view in FIG. 73, and at the "cartridge retraction completed position" (P2), as shown in a side view in FIG. , At respective positions P1 and P2, the cartridge holder 1
00 is positioned at the “cartridge receiving position”, and the magnetic head 14 is positioned at the “standby position”.

The configuration on the gear chassis 118 at the “cartridge insertion detection position” is as shown in FIG. That is, in FIG. 72, at the “cartridge insertion detection position”, the positions of the cartridge holder 100 and the magnetic head 14 do not change from the “cartridge unload position” (P1).
The rotation position of No. 4 does not change, and simply the retraction link 266 is used.
Is rotated clockwise around the pivot pin 252,
The state where the detection lever 250 is rotated clockwise and the third detection sensor 260 is turned off is shown.

The magneto-optical disk cartridge 42
Is completely drawn into the cartridge holder 100,
Even after being brought to the “cartridge retraction completed position” (P2), the drive of the drive motor 56 is still continued and the detection / drive gear 234 continues to be rotationally driven.
Due to the cam shape of the drive cam groove 278 in the slide plate drive mechanism 264 described above, the drive pin 276 is not driven to rotate, and as a result, the movement drive of the slide plate 268 is stopped and the drawing operation of the disk cartridge 42 is stopped. On the other hand, the rotation of the detection / drive gear 234 by the drive of the drive motor 56 causes the gear arm 310 on which the lock arm 312 locking the drive pin 298 is mounted to rotate clockwise, thereby mounting the drive pin 298. The link arm 284 is similarly driven to rotate clockwise, so that the link arm 284
A pair of left and right control cam plates 1 locked at both left and right ends, respectively.
02 and 104 are driven to move in opposite directions. The drive of the drive motor 56 is temporarily stopped when the cartridge holder 100 is lowered to the “cartridge loading position” (P3) and when the second detection sensor 328 is turned off. In this way, the cartridge holder 100 is held at the “cartridge loading position”.

The internal structure of the magneto-optical disk device 10 at the above-mentioned "cartridge retraction completed position" (P2) is shown in FIG. 55, its plan view, FIG. 61 on its left side, and FIG. Each shape is shown. The front shape at the “cartridge retraction completion position” (P2) is the same as the “cartridge unload position” (P1) shown in FIG. The internal structure of the magneto-optical disk device 10 at the “cartridge loading position” (P3) is shown in FIG. 56, its plan view, FIG. 63, its left side view, FIG. 64, its right side view, and FIG. The front shape is shown at 70.

When the cartridge holder 100 is brought to the "cartridge loading position" (P3), as shown in FIG. 74 in a front view and in FIG. Is brought to a position immediately before the “intermediate position” (substantially “intermediate position”). Then, after being brought to the "cartridge loading position" (P3), the spindle motor 44 is activated as described above, and the magneto-optical disk 12 in the disk cartridge 42 at the "cartridge loading position" (P3) is started. Is rotated to read the optical code signal written in the control track on the inner peripheral side of the optical disk.

On the other hand, FIG. 48 shows a state during the loading operation of the magnetic head 14, that is, a pair of left and right control cam plates 102,
The timing detection state when the magnetic head 104 is moved from the position corresponding to the “cartridge loading position” (P3) to the position corresponding to the “magnetic head loading position” of the magnetic head 14 is shown.

That is, during the loading operation of the magnetic head 14, when the magnetic head loading is instructed from the control circuit, the electromagnetic solenoid 290 is energized, and the solenoid arm 300 is attracted and energized. Drive forward again. This drive motor 56
The first detection sensor 326 is turned on by the first detection rib 322 coming out of the detection range of the first detection sensor 326 with the forward rotation of the first detection sensor 326.
6, the automatic loading / unloading mechanism 52 up to the magnetic head 14 "magnetic head loading position" (P4).
, The completion of the magnetic head loading is detected. Upon detecting the completion of the magnetic head loading, the normal rotation operation of the drive motor 56 is stopped. Here, before the first detection sensor 326 is turned on, the third detection sensor 260 is
When the zero driven pin 262 is pushed by the link arm 284, the detection lever 250 rotates clockwise, and comes out of the detection range of the third detection sensor 260, so that the third detection sensor 260 is turned on. .

When the first detection sensor 326 is turned on, the “magnetic head load position” (P
Before the position detection of 4) is performed, the slit 32 described above is used.
Due to 2a, for example, an on state of about 20 msec (that is, 1
The second ON state) occurs. This first ON state of the first detection sensor 326 is not used in the timing detection operation of the loading operation of the magnetic head 14. Therefore, in this embodiment, when the first detection sensor 326 is turned on for the second time, the normal rotation operation of the drive motor 56 is set to be stopped.

More specifically, the magnetic head loading operation is performed by rotating the gear arm 310, to which the lock arm 312 locking the drive pin 298 is attached, further clockwise by the forward rotation of the drive motor 56 again. As a result, the link arm 284 to which the drive pin 298 is attached is further rotated clockwise in the same manner. As a result, the pair of left and right control cam plates 102 and 104 having the left and right ends of the link arm 284 respectively locked are It is further driven to move in opposite directions. As described above, when the pair of left and right control cam plates 102 and 104 are further driven to move from the position defining the “cartridge loading position” (P3), the magnetic head 14 passes through the “intermediate position”,
Further, it is lowered toward the "magnetic head load position" (P4). Immediately before the magnetic head 14 is brought to the “magnetic head loading position” (P 4), the drive pin 298 is locked by the locking portion 300 b of the solenoid arm 300, and the other half of the lock arm 312. The lock is released when the portion 312c contacts the pivot pin 302 and is rotated counterclockwise. Then, when the magnetic head 14 is brought to the “magnetic head loading position” (P4), the driving of the drive motor 56 is stopped by turning on the first detection sensor 326 as described above, The magnetic head 14 is located at the “magnetic head load position” (P
4) is held. Thus, the loading operation of the magnetic head 14 ends.

The “magnetic head load position” (P
FIG. 57 shows the front structure, FIG. 65 shows the left side shape, FIG. 66 shows the right side shape, and FIG. 75 shows the front shape of the magneto-optical disk device 10 in 4). It has been done. Also, the magnetic head 14
In the state brought to the "magnetic head loading position" (P4), FIG.
The magnetic head 14 is positioned immediately above the magneto-optical disk 12 as shown in a side view.

FIG. 49 shows the state of the magnetic head 14 during the unloading operation, that is, the pair of left and right control cam plates 10.
2 shows a timing detection state when moving the cartridge 2, 104 from the position corresponding to the “magnetic head load position” (P4) to the position corresponding to the “cartridge load position”.

That is, during the unloading operation of the magnetic head 14, when the magnetic head unload is instructed from the control circuit, the drive motor 56 is driven to rotate in the reverse direction.
The magnetic head unload operation starts. With the reverse rotation of the drive motor 56, the detection / drive gear 234 is rotationally driven (reversely rotated) in a direction opposite to that in the loading operation. With the reverse rotation of the detection / drive gear 234, the link arm 284 rotates counterclockwise. With this rotation, the detection lever 250 rotates counterclockwise to enter the detection range of the third detection sensor 260, and first, the third detection sensor 260 is turned off. Thereafter, the detection / drive gear 2
34, the first detection rib 322 moves to the first position.
, The first detection sensor 326 is turned off.

Further, when the reverse rotation of the detection / drive gear 234 proceeds, the slit 322a of the first detection rib 322 is moved.
Is supplied to the first detection sensor 326, and the first detection sensor 326 is turned on for about 20 msec (ie, the first ON). When the first detection sensor 326 is turned on for the first time, the electromagnetic solenoid 290 is demagnetized. Thereby, the electromagnetic attraction force to the solenoid arm 300 disappears. As a result, the locking portion 300 of the solenoid arm 300
The locked state of the drive pin 298 by the b is released, and the further counterclockwise rotation of the link arm 284 to which the drive pin 298 is attached is allowed. In this way, the pair of left and right control cam plates 102 and 104 engaged at both ends with the link arm 284 rotated counterclockwise is driven to move to a position corresponding to the “cartridge loading position”.

Then, the second detection rib 324 is moved to the second detection sensor 32 by the reverse rotation of the detection / drive gear 234.
By exiting from the detection range of No. 8, the second detection sensor 328 is turned on. When the second detection sensor 328 is turned on, the magnetic head 14 is moved to at least the “intermediate position”.
Is detected, and the reverse rotation of the drive motor 56 is stopped by the magnetic head unload detection. Thus, the unloading operation of the magnetic head 14 ends.

FIG. 50 shows that the disc cartridge 42 is in the unloading operation, that is, the pair of left and right control cam plates 102 and 104 are in the "cartridge loading position".
The timing detection state when moving from the position corresponding to (P3) to the position corresponding to “cartridge unload position” (P1) is shown.

That is, the magneto-optical disk cartridge 4
In the unloading operation of No. 2, when the cartridge unload is instructed from the control circuit, the drive motor 56 is driven to rotate in the reverse direction to start the cartridge unloading operation. With the reverse rotation of the drive motor 56, the cartridge holder 100 is moved to the “cartridge loading position” (P
3) to the “cartridge receiving position” and the cartridge holder 100 is moved to the “cartridge receiving position”.
When the cartridge holder 100 is raised, the raising operation of the cartridge holder 100 is stopped, and the slide plate driving mechanism 264 is driven from the cartridge holder 100 in the direction opposite to the loading direction to move the disk cartridge 42 to the “cartridge retraction completion position”. It moves so as to be pulled out from (P2) to the “cartridge unload position”. And the first
The first detection sensor 326 is turned on by the detection rib 322 of the first detection sensor 326 coming out of the detection range of the first detection sensor 326. When the first detection sensor 326 is turned on, it is detected that the disk cartridge 42 has been returned to the “cartridge unload position” (P1), that is, the completion of the cartridge unload operation. By detecting the completion of the cartridge unloading, the reverse rotation of the drive motor 56 is stopped. Thus, the unloading operation of the disk cartridge 42 ends.

Before the first detection sensor 326 is turned on, the detected piece 250a of the detection lever 250 comes out of the detection range of the third detection sensor 260, and the third detection sensor 260 is turned on. I have. However, in the cartridge unloading operation, the ON timing of the third detection sensor 260 is not used at all.

Here, at a position (P5) where the disk cartridge 42 is being unloaded from the “cartridge retraction completion position” (P2) to the “cartridge unload position” (P1), the disk cartridge 42 is The configuration is shown in FIG.
FIG. 68 shows its left side shape, and FIG. 68 shows its right side shape.

Also, FIG. 51 shows that when the magnetic head 14 is forcibly unloaded by the urging force of the return spring 318, that is, the pair of left and right control cam plates 102 and 104 are not driven by the driving motor 56 but by the return spring. From the position corresponding to the “magnetic head load position” (P4) using the urging force of 318, the “cartridge load position” (P3)
3 shows a timing detection state when forcibly moving to a position corresponding to.

That is, during the forced unloading operation of the magnetic head 14 due to the spring force, the power supply is cut off (power cut off) due to a power failure or the like while the magnetic head loading is instructed from the control circuit. Then, the power supply to the electromagnetic solenoid 290 of the above-described forced return mechanism 288 is cut off, and the electromagnetic solenoid 290 is automatically demagnetized. With the demagnetization of the electromagnetic solenoid 290, the electromagnetic attraction to the solenoid arm 300 disappears, and the locked state of the drive pin 298 by this solenoid arm 300 is released. As a result, from the state shown in FIG. 71, the drive pin 298 is engaged with the solenoid arm 300 by the urging force of the return spring 318 that is urging the eject arm 304 to which the eject pin 320 is attached to rotate counterclockwise. The stopper 300b is pushed back to retract the solenoid arm 300 from the locked position. In this way,
The link arm 284 to which the drive pin 298 is attached rotates counterclockwise (that is, returns) by the urging force of the return spring 318. With the rotation of the link arm 284 in the counterclockwise direction, the pair of left and right control cam plates 102 and 104 move to the “magnetic head load position” (P4).
Is forcibly moved and driven by the urging force of the return spring 318 from the position corresponding to the position (1) to the position corresponding to the “intermediate position”.

The return rotation of the link arm 284 based on the urging force of the return spring 318 is stopped when the eject pin 320 comes into contact with the rear end of the third guide groove 296 in which the eject pin 320 is fitted. The drive pin 298 attached to the link arm 284 is set to be locked at the tip of the lock arm 312 when the return rotation of the link arm 284 is stopped.

Here, such a return rotation of the link arm 284 does not change the rotation position of the detection / drive gear 234 at all. For this reason, in the state where the magnetic head 14 is forcibly driven upward from the “magnetic head load position” (P4) to the “intermediate position”, the first
No change occurs in the detection states of the second detection sensors 326 and 328. On the other hand, as for the third detection sensor 260, when the link arm 284 rotates counterclockwise, the detection lever 250 rotates counterclockwise to enter the detection range of the third detection sensor 260, 3 detection sensor 2
60 will be turned off.

In this way, even if the power supply is interrupted due to a power failure, etc.,
The magnetic head 14 is forcibly returned from the "magnetic head load position" to the "intermediate position" by using the urging force of the return spring 318. As a result, as described above, the risk of damage to the magnetic head 14 is reliably avoided.

As described above, the magnetic head 14 moves the return spring 3 from the "magnetic head load position" to the "intermediate position".
The configuration on the gear chassis 118 in a state where the gear chassis 118 is forcibly returned by using the urging force of FIG. 18 is as shown in FIG.

Here, FIG. 52 shows a state in which the return of the magnetic head from the “magnetic head load position” to the “intermediate position” by the return spring 318 shown in FIG. The timing detection state when the drive gear 234 is returned to the position corresponding to the “intermediate position” is shown.

That is, the control circuit resumes the control operation in response to the restart of the supply of the electric power.
4 is started. Here, when the control operation is restarted, the control circuit operates the first detection sensor 326
Is on, and the second and third detection sensors 328, 2
Based on the state in which both the switches 60 are off, it is determined that the control operation is not the normal control start state but the control operation is resumed after the forced return mechanism 288 operates. As described above, when the control is resumed after the return operation, the control circuit first detects and
The rotational position of the drive gear 234 and the pair of left and right control cam plates 1
Since the moving positions of the magnetic heads 02 and 104 are out of the normal positional relationship, the detection / drive gear 234 is moved to the rotation position corresponding to the "intermediate position" of the magnetic head 14 in order to eliminate such an abnormal state. A return control for returning rotation is executed.

More specifically, as shown in FIG. 52, when a return rotation of the detection / drive gear 234 is instructed from the control circuit,
The drive motor 56 is driven to rotate in the reverse direction. With the reverse rotation of the drive motor 56, the detection / drive gear 234 is rotationally driven (reversely rotated) in a direction opposite to that in the loading operation. With the reverse rotation of the detection / drive gear 234, the gear arm 3
10 only rotates counterclockwise, the link arm 28
4 does not rotate. When the reverse rotation of the detection / drive gear 234 proceeds, the first detection rib 322 is moved to the first detection sensor 3.
26, and the first detection sensor 326 is turned off.

Further, when the reverse rotation of the detection / drive gear 234 proceeds, the slit 322a of the first detection rib 322
Is supplied to the first detection sensor 326 to turn on the first detection sensor 326 for about 20 msec. When the detection / drive gear 234 further rotates in the reverse direction, the second
Comes out of the detection range of the second detection sensor 328, and the second detection sensor 328 is turned off. When the second detection sensor 328 is turned off, detection and
It is detected that the rotation position of the drive gear 234 has been rotated to a position corresponding to the “intermediate position” of the magnetic head 14, and the reverse rotation of the drive motor 56 is stopped by this rotation return detection. In this way, the rotational position of the detection / drive gear 234 and the moving positions of the pair of left and right control cam plates 102 and 104 are returned to the normal positional relationship.

Here, FIG. 53 shows the time of the reloading operation of the magnetic head 14 to the “magnetic head load position” (P4), that is, the rotation position of the detection / drive gear 234 shown in FIG. The pair of left and right control cam plates 102, 104 is returned to the position corresponding to the "magnetic head load position" (P4) from the state of return to the normal positional relationship with the movement position of the control cam plates 102, 104. The timing detection state at this time is shown.

That is, during the reloading operation of the magnetic head 14, when the reloading of the magnetic head is instructed from the control circuit, the electromagnetic solenoid 290 is excited and the drive motor 56 is driven to rotate forward again. With the forward rotation of the drive motor 56, first, the second detection rib 324 enters the detection range of the second detection sensor 328, and the second detection sensor 328 is turned off. After this,
When the first detection rib 322 moves out of the detection range of the first detection sensor 326, the first detection sensor 326 is turned on, and by the ON operation of the first detection sensor 326, the "magnetic head load" Position ”(P
Until 4), the automatic loading / unloading mechanism 52 detects the automatic loading, that is, the completion of the magnetic head reloading. With the detection of the completion of the reloading of the magnetic head, the normal rotation operation of the drive motor 56 is stopped.

Here, as in the case of the above-described magnetic head loading operation, before the first detection sensor 326 is turned on, the third detection sensor 260 is turned on by the detection lever 2.
When the driven pin 262 is pushed by the link arm 284, the detection lever 250 is rotated clockwise, and comes out of the detection range of the third detection sensor 260, so that the third detection sensor 260 is turned on. ing.

When the first detection sensor 326 is turned on, the “magnetic head load position” of the magnetic head 14 is determined.
Before the position detection in (P4) is performed, the above-described slit 322a generates an ON state of about 20 msec.
The on state of the first detection sensor 326 of about 20 msec is not used in the timing detection operation of the reloading operation of the magnetic head 14. Therefore, in this embodiment, the normal rotation operation of the drive motor 56 is stopped when the ON state continues even if at least about 20 msec has elapsed since the first detection sensor 326 was turned ON. Is set to

As described in detail above, the timing detection mechanism 60 in this embodiment includes the detection / drive gear 234, the detection lever 250, the first detection sensor 326, the second detection sensor 328, and the third detection sensor. The drive control of the loading / unloading operation of the disk cartridge 42 and the loading / unloading operation of the magnetic head 14 is accurately performed only by including the first detection rib 260, the first detection rib 322, and the second detection rib 324. You can do it.

Next, (6) a horizontal positioning mechanism for precisely defining the horizontal position of the “magnetic head loading position” of the magnetic head mounting base 62, which is a characteristic configuration of this embodiment, always at a constant position. 66 will be described with reference to FIGS.

First, as shown in FIG. 80, the pair of right and left rear position regulating pins 24a and 24b constituting the above-described vertical direction positioning mechanism 64 have positioning recesses 332a and 332b each having a circular shape in plan view on the upper surface. Is formed. On the other hand, the horizontal positioning mechanism 66 is provided on the lower surface of the rear end edge of the magnetic head mounting base 62 from above from the concave portions 332a, 33 of the rear position regulating pins 24a, 24b, respectively.
2b, a pair of left and right rear positioning pins 334 to be fitted.
a and 334b are integrally formed so as to protrude downward, respectively. Here, each rear positioning pin 334
a, 334b are formed of tapered pins whose diameter is gradually reduced as they go downward. In this manner, the magnetic head mounting base 62 is brought to the “magnetic head loading position”, and the rear positioning pins 334a and 334b are fitted into the corresponding concave portions 332a and 332b of the rear position regulating pins 24a and 24b. Thus, the horizontal position of the magnetic head mounting base 62 is roughly defined.

As shown in FIG. 81, the rear positioning pin 33 is located to the left as viewed from the insertion direction X (note that since FIG. 81 is a bottom view, it is located to the right in the state shown).
4a and the corresponding recess 3 of the rear position regulating pin 24a
The state of fitting with 32a is set to be a loose fitting state, that is, to be fitted with a predetermined play. On the other hand, the rear positioning pin 334b is located on the right side as viewed from the insertion direction X (as described above, since FIG. 81 is a bottom view, it is located on the left side in the illustrated state), and the corresponding rear position regulation The fitting state of the pin 24b with the concave portion 332b is set so as to be tight, that is, fitted without a predetermined play. In this manner, in this embodiment, the left portion (the right portion in the state shown) of the magnetic head mounting base 62 is pressed along a certain direction to drive the magnetic head mounting base 62 horizontally. The direction position is always set to a fixed position.

For this reason, the horizontal positioning mechanism 66
When the control cam plates 102 and 104 are driven to move to a position corresponding to the “magnetic head loading position”, the left portion (the right portion in the illustrated state) of the magnetic head mounting base 62 is inserted in the insertion direction X. It is configured to press and urge along a predetermined direction that is inclined. That is, as shown in FIGS. 82 and 83, the horizontal positioning mechanism 66 includes a preload link arm 338 rotatably supported by the left side portion 26b of the loading chassis 26 via the support pin 336. A preload slide plate 340 slidably mounted in the insertion direction X on the lower surface of the magnetic head mounting base 62 so as to be pushed by the preload link arm 338, and a rear position where the rear positioning pin 334a is fitted in the recess 332a. A preload arm 344 rotatably supported by the magnetic head mounting base 62 via a pivot pin 342 so as to be able to contact the regulating pin 24a, and is bridged between the preload arm 344 and the preload slide plate 340. And a preload spring 346. More specifically, the above-described preload link arm 338 is formed in a substantially L-shape in side view, and the loading chassis 26 is provided via a pivot pin 336 that extends horizontally at the bent portion.

The left side part 26b is rotatably supported by the left side part 26b. In addition, a tip (rear end) of a rear extension piece 338a that extends toward the rear of the preload link arm 338 includes
A cam pin 348 that fits into the pressing cam groove 102d formed on the left control cam plate 102 is implanted, and the downwardly extending piece 338b of the preload link arm 338 is provided.
A pressing pin 350 set to be able to press the rear end of the preload slide plate 340 is attached to the front end (lower end) of the front end so as to extend horizontally on its inner surface. In this way,
When the left control cam plate 102 is driven to move to a position corresponding to the “magnetic head load position”, the cam pin 348 is engaged with the pressing cam groove 102d to form the cam shape of the pressing cam groove 102d. Accordingly, the preload link arm 338 is rotated clockwise in the figure from the position indicated by the solid line in FIG. 83 to the position indicated by the two-dot chain line.
Then, by rotating to the position shown by the two-dot chain line, the pressing pin 350 attached to the preload link arm 338 pushes the preload slide plate 340 in the insertion direction X.
Pushing in the opposite direction. A locking portion 340a for locking the front end of the preload spring 346 described above is formed on the lower surface of the front end of the preload slide plate 340 in a state of falling.

On the other hand, the above-mentioned preload arm 344 is formed in a substantially L shape in plan view, and
A contact portion 352 that can contact the corresponding rear position regulating pin 24a with the magnetic head mounting base 62 brought to the “magnetic head load position” outside the 44a.
Is attached. The abutting portion 352 is provided for the rear position regulating pin 2 when the preload link arm 338 does not push the preload slide plate 340 and is not driven to pull the preload spring 346 at all.
It is positioned at a position slightly separated from the outer periphery of 4a. The other piece 344b extending outward in a direction perpendicular to the insertion direction X of the preload arm 344 is provided with a locking part 344c for locking the rear end of the preload spring 346 in a falling state. Is formed.

Since the horizontal positioning mechanism 66 is configured as described above, the magnetic head actuator 62 moves with the pair of left and right control cam plates 102 and 104 moving.
At the time when it is lowered to the position corresponding to the “magnetic head load position”, the vertical positioning mechanism 64 described above accurately positions the vertical position, and the pair of left and right rear positioning pins 334a and 334b By fitting the rear position restricting pins 24a and 24b corresponding to the above into the respective concave portions 332a and 332b from above, the horizontal positioning is roughly performed.

In this state, the pair of left and right control cam plates 102 and 104 are further driven to move, so that the cam pins 348 are formed in accordance with the cam shape of the pressing cam groove 102d formed in the left control cam plate 102. As a result, the preload link arm 338 is rotated clockwise in FIG. 83 around the pivot pin 336. By the rotation of the preload link arm 338, the pressing pin 350 attached to the arm engages with the rear end of the preload slide plate 340, and pushes and drives this in the direction opposite to the insertion direction X. The preload spring 346 is pulled and driven in response to the press-in drive of the preload slide plate 340, and as a result, the preload arm 344 is urged clockwise around the pivot pin 342. Thus, the contact portion 352 of the preload arm 344 comes into contact with the outer periphery of the rear position regulating pin 24a.

As a result, the circumferential portion of the rear position regulating pin 24a is sandwiched between the contact portion 352 of the preload arm 344 and the rear positioning pin 344a, so that there is no gap between the two. The magnetic head mounting base 62 is attached to the rear positioning pin 334 so as to be clamped in the state.
It rotates around b. In this way, the magnetic head mounting base 62 is always brought to a constant horizontal position when the horizontal positioning mechanism 66 operates, and thus the horizontal positioning operation of the magnetic head mounting base 62 is performed. Will be achieved.

That is, in this embodiment, by providing the horizontal positioning mechanism 66 and the vertical positioning mechanism 64 described above, the magnetic head mounting base 62 is in a state of being loaded at the “magnetic head loading position”. Thus, the horizontal position and the vertical position are accurately positioned. As a result, the horizontal position and the vertical position of the magnetic head 14 attached to the magnetic head attachment base 62 are also accurately defined, and a more accurate information recording (overwriting) operation is achieved.

Next, the magnetic head 14 having the characteristic structure (7) of this embodiment is attached to the magnetic head mounting base 62.
Magnetic head carriage 68 slidably held on top
Will be described with reference to FIGS. 78 and 79 and FIGS. 84 to 87.

First, as shown in FIGS. 78 and 79, with the magnetic head 14 loaded at the “magnetic head loading position” (P4), the magnetic head 14 and the optical head 16
In a state synchronized with each other, the magneto-optical disk 12 is moved and driven between the outermost position (FIG. 78) and the innermost position (FIG. 79) via the linear motors 162 and 134, respectively. Here, the magnetic head carriage 68, which is mounted on the lower surface of the magnetic head mounting base 62 so as to be movable along the radial direction of the magneto-optical disk 12 while the magnetic head 14 is mounted, is moved to the “standby position” at the end. FIG. 8 shows a lock mechanism 70 for locking at the outer peripheral position.
As shown in FIG. 4, a locking hook 354 fixed to the radially outermost portion of the carriage arm 170 integrally attached to the magnetic head carriage 68 and having a substantially L-shape in side view.
A locking hook 354 provided on the inner surface of the rear cover 30 attached so as to close the rear surface of the loading chassis 26 and brought to the outermost peripheral position in the "standby position" as shown in FIG. And a lock lever 356 for locking this from the outermost position so as to be immovable. The lock lever 356 is formed to be substantially L-shaped in side view so as to be able to lock the above-described locking hook 354.

Here, this lock lever 356 is
6 and attached to the inner surface of the rear cover 30 via an attachment mechanism 358 shown enlarged in FIG. That is,
The mounting mechanism 358 includes a mounting stay 360 fixed to the inner surface of the rear cover 30 and the mounting stay 3.
A pair of left and right support pieces 362a, 362b bent so as to fall on both sides of the distal end portion 60, and both support pieces 362a, 362
And a support shaft 364 extending in a horizontal direction perpendicular to the insertion direction X, and a lock lever 356 is rotatably attached to the support shaft 364.

Further, a torsion spring 366 is wound around the support shaft 364.
One end is locked to a mounting stay 360, and the other end is locked to a lock lever 356, which urges the lock lever 356 to rotate clockwise in FIG. By the urging force of the torsion spring 366, the lock lever 356 is elastically held in the posture shown in FIG.

Since the lock mechanism 70 is configured as described above, when an unload instruction of the disk cartridge 42 is issued in the magneto-optical disk device 10, the unloading operation via the above-described automatic load / unload mechanism 52 is performed. As a result, the magnetic head 14 is unloaded to the "intermediate position", and this unloading operation temporarily stops. In this state, the linear motor 162 is activated, and drives the magnetic head carriage 68 to move radially outward of the magneto-optical disk 12. Then, the magnetic head carriage 68 is moved radially outward by the operation of the linear motor 162, and the unloading operation is started again with the magnetic head carriage 68 pressed against the mechanical stop position. That is, while the magnetic head mounting base 62 is moved from the "intermediate position" to the "standby position", the magnetic head carriage 62 is securely held at the radially outermost position.

With the magnetic head mounting base 62 unloaded to the "standby position" in this manner, the locking hook 354 fixed to the carriage arm 170 integrally mounted on the magnetic head carriage 68 Engage with the lock lever 356 from below, and
2 is stopped from moving inward in the opposite radial direction. In this locked state, even when the disk cartridge 42 is removed from the magneto-optical disk device 10 and the power is turned off, the magnetic head mounting base 62 remains in the cam groove 102b ₁ corresponding to the cam pins 178a, 178b, 178c, 178d. 102b ₂ , 104b
₁ ; mechanically “standby position” by engagement with 104b ₂
, And the magnetic head carriage 68 is locked from moving in the inner circumferential direction at the outermost circumferential position. Therefore, the magnetic head carriage 68 is locked in a state where its movement is prohibited at the outermost peripheral position in the “standby position”. As a result, even if the disk cartridge 42 is taken out of the magneto-optical disk device 10 and carried, and a moving force acts on the magnetic head carriage 68, the magnetic head carriage 68 is moved to the outermost position at the "standby position". Since the position is locked in a state where the movement is prohibited, there is no danger of movement due to this carrying, and thereby, the impact force due to careless movement on the magnetic head 14 is reliably prevented. Will be.

Next, (8) a laser optical system 72 for guiding a laser beam to the optical head 16 having the characteristic structure of this embodiment.
Will be described with reference to FIG. 7, FIG. 88, and FIG. 89 described above.

First, as shown in FIG. 7, an optical system mounting base 24c on which the laser optical system 72 is mounted on the mounting reference plane Z is integrally connected to the rear of the optical head mounting base 24. . As shown in FIG. 88, the laser optical system 72 includes an optical system housing 368 that is fixed to the optical system mounting base 24c at a reference plane Z. A semiconductor laser serving as a laser light source 370 is attached to one side of the optical system housing 368, and a collimator lens 372 is positioned inside the optical system housing 368 on the optical path of the semiconductor laser 370. Installed.

[0215] Also, in front of the collimator lens 372, the laser beam transmitted through the collimator lens 372, photodiode 374 for the light beam and the automatic power controller having an optical axis L ₁ toward the optical head 16 (APC) thereby split into a light beam having an optical axis L ₂ toward the laser beam returning from the optical head 16 (i.e.,
A laser beam including the recording information reflected back on the recording surface of the magneto-optical disk 12 and a laser beam including the servo information reflected back by the servo tracking) are passed therethrough and used for servo / data detection. A beam splitter 74 for reflecting light toward the photo sensor 376 is provided. The beam splitter 74 and the photo sensor 3
76, a condensing lens 3 for condensing the laser beam returned from the optical head 16 on the photosensor 376.
78 is disposed on the optical axis L ₃ of the reflected light path, and the laser light returned from the optical head 16 is converted into a P wave and an S wave between the condenser lens 378 and the photo sensor 376. A separating polarizing beam splitter 380 is provided.

Here, the beam splitter 74 described above is used.
Is formed by joining two triangular prisms 382 and 384, and as shown in FIG.
82 has surfaces 382a and 382b orthogonal to each other and an inclined surface 382c corresponding to the hypotenuse of a right-angled triangle, and the second triangular prism 384 has surfaces 38 orthogonal to each other.
4a and 384b and a slope 384c corresponding to the hypotenuse of a right-angled triangle. Then, the second triangular prism 38 is placed on the slope 382c of the first triangular prism 382.
4 is joined to the other orthogonal surface 384b.
A half mirror film is interposed between c and 384b.

Further, one orthogonal surface 382a of the first triangular prism 382 is defined as an incident surface of the laser beam from the semiconductor laser 370, and the other orthogonal surface 382b is reflected by the half mirror film, and It is defined as the emission surface of the laser light directed toward. On the other hand, one orthogonal surface 384a of the second triangular prism 384 is
The inclined surface 384c of the laser light is returned as a reflection surface of the laser light, and the inclined surface 384c of the inclined surface 384c is defined as an emission surface of the laser light separated by the half mirror film and directed to the APC photodiode 374. Have been.

The first and second triangular prisms 382 and 384 whose surfaces are defined in this way are features of this embodiment.
The angle formed between one orthogonal surface 382a and the inclined surface 382c is set to be 44 degrees, and the other orthogonal surface 384b and the inclined surface 3 in the second triangular prism 384 are
The angle formed with 84c is set to be 44 degrees.

[0219] The first and second components configured as described above are used.
The beam splitter 74 formed by joining the triangular prisms 382 and 384 of the first triangular prism 382, which is defined as the incident surface of the laser beam from the semiconductor laser 370, as shown in FIG. One orthogonal plane 3
The optical axis L ₀ incident on the light source 82 a is 1.5 clockwise with respect to the normal N ₁ to the _one orthogonal surface 382 a at the incident position.
As it inclined only once, also emerging optical axis L ₁ from the other orthogonal plane 382b of the first triangular prism 382, with respect to the normal N ₂ of the other orthogonal plane 382b in the injection position, clockwise as tilted by 1.51 °, also emerging optical axis L ₂ of the laser light directed to the photo diode 374 for APC slope 384c of the second triangular prism 384, a normal N ₃ to slope 384c in the injection position respect, as tilted by 1.51 degrees clockwise, also emerging optical axis L ₃ of the laser beam toward the second photosensor 376 slope 384c of the triangular prism 384, the slope at the exit position 38
The optical system housing 3 is set in such a manner that the optical system housing 3 is tilted clockwise by 1.51 degrees with respect to the normal N ₄ to 4c.
68.

Here, each surface 382a, 382b, 3
Normal N ₁ of _{84c, N 2, N 3 (} N 4) is a tilt angle with respect to the corresponding optical axis _{L 0, L 1, L 2} (L 3) of 1.
51 degrees, these first and second triangular prisms 382, 382
384 is set to be equal to the refractive index of the optical glass (for example, BK7).

As described above, the respective surfaces 382a, 382b,
The beam splitter 74 is attached to the optical system housing 368 in a state where the attachment angle of the 384c is specified, so that, for example, laser light (L ₀ ) incident from one orthogonal surface 382a is incident on the incident surface (382a). is refracted, in a state inclined by 1 ° to the normal line N ₁ perpendicular to the orthogonal plane 382a of the one first triangular prism 38
Get inside 2. As a result, the first triangular prism 382
The laser light (L ₀ ′) incident on the half mirror film is incident on the half mirror film at exactly 45 degrees. The laser beam (L ₁ ′) reflected by the half mirror film in this manner is inclined by one degree with respect to the normal line N ₂ orthogonal to the other orthogonal surface 382b. Then, this laser light (L ₁ ′)
Is refracted by the exit surface (382b), in a state inclined by 1.51 ° to the normal line N ₂ that is orthogonal to the orthogonal plane 382 of the other, the laser beam toward the optical head 16 (L
₁ ) is emitted from the first triangular prism 382.

As a result, by using the beam splitter 74 attached in this manner, the incident angle of the laser beam on the half mirror film becomes 45 degrees as before, so that a new design for the half mirror film is unnecessary. Becomes Also, the corresponding optical axes L ₀ , L ₁ , N ₄ of the normals N ₁ , N ₂ , N ₃ , N ₄ of the respective surfaces 382 a, 382 b, 384 c.
Since L ₂ and L ₃ are each inclined by 1.51 degrees, for example, one orthogonal surface 382 of the first triangular prism 382
Even if there is a component reflected by the one orthogonal surface 382a in the laser beam (L ₀ ) to be incident from a, the reflected component returns to the semiconductor laser 370 via the incident optical path, and No problem is caused in the semiconductor laser 370. Further, even if the laser beam (L ₁ ′) reflected by the half mirror film has a component reflected by the other orthogonal surface 382 b of the first triangular prism 382, the reflected component passes through the incident optical path. There is no return to the semiconductor laser 370 again. Further, there is no danger that the light passes through the half mirror film and is reflected by one of the orthogonal surfaces 384a to reach the servo / data detecting photosensor 376, thereby causing a defect in the read information.

As described above, according to this embodiment, it is possible to easily achieve a countermeasure against stray light without impairing any optical characteristics. Furthermore, the mounting angle of the beam splitter 384, 1.51 only in an inclined state with respect to the incident optical axis L _0, using a mounting jig (not shown), as long mounting while correctly positioned, the remaining Since the optical axis L ₂ is orthogonal to the mounting reference plane Z, and the optical axes L ₃ and L ₄ are parallel to the mounting reference plane Z, the condenser lens in the optical system housing 368 is provided. 378 or polarizing beam splitter 38
The mounting angle of 0 can be accurately defined based on the mounting surface reference Z without using a special mounting jig, and the mounting angle of the optical head 16 described above is also determined by the mounting reference surface Z. Can be accurately defined on the basis of the above, and in this manner, the mounting state such as the mounting angle of another optical element can be simply and extremely accurately specified.

Finally, as a part of the initial processing at the time of starting the magneto-optical disk device 10 having the characteristic structure of this embodiment (9), the magnetic head 14 and the optical head 16 are positioned at the outermost position of the magneto-optical disk 12. The control procedure for synchronizing with the above will be described in the control procedure in the above-described control circuit.

First, referring to FIG. 90, the control procedure of the overall operation in this control circuit will be schematically described.

That is, it waits until the power is turned on (S10).
(NO in S10), when the power-on is detected (YE in S10)
S), the first to third detection sensors 326, 328, 26
The on / off state of 0 is checked (S12). In this sensor check, the first to third detection sensors 32
When all the outputs of 6,328 are on, the disk cartridge 42 is in the "cartridge unload position".
In the state of (P1), it is determined that the power has been turned on, and thereafter, the CPU waits for the insertion of the disk cartridge 42. That is, the process waits until the third detection sensor 260 is turned off (S14). When the third detection sensor 260 is turned off, it is determined that the disk cartridge 42 has been manually inserted by the operator up to the “cartridge insertion detection position”. Upon activation, the loading process of the disk cartridge 42 is started (S16). This loading processing will be described later in detail as a subroutine with reference to FIGS.

Then, when the loading process is completed,
Data write / read processing is performed on the magneto-optical disk 12 in the loaded disk cartridge 42 (S18). Here, as will be apparent from a loading process described later, the loaded magneto-optical disk 1
The magnetic head 14 is lowered to the "magnetic head load position" (P4) only when the information recording device 2 is a single-sided type and is not write-protected. Has become. In the case of other types, that is, in the case of a double-sided type, or in the case of write-protection, the information recording (overwrite) operation is unnecessary, so In the intermediate position ".

Thereafter, the eject switch 3 shown in FIG.
86 is turned on (S20), and when the eject switch 386 is turned on (YES in S20), an unloading process is executed (S22), and the direction of loading the automatic load / unload mechanism 52 is reversed. To unload the loaded disk cartridge 42 to the "cartridge unload position" (P1), and to mount the magnetic head mounting base 62 at the "intermediate position" or the "magnetic head load position" (P4).
To the "standby position". This unloading process will be described later in detail as a subroutine with reference to FIG.

Thus, a series of control procedures is completed by unloading the disk cartridge 42 to the “cartridge unload position” (P1).

On the other hand, in the above-described sensor check in step S12, when it is determined that the output of the first detection sensor 326 is on and both the outputs of the second and third detection sensors 328 and 260 are off. In the state where the magnetic head 14 is in the “magnetic head loading position”, the power is cut off due to, for example, a power failure, and the electromagnetic solenoid 290 is turned off.
By operating the forcible return mechanism 288 utilizing demagnetization of the magnetic head, only the magnetic head mounting base 62 returns the return spring 3
Since it is determined that the power has been turned on since the forcible force of 18 has returned to the "intermediate position", it is determined that the power supply has been turned on. The detection / drive gear 234 is returned to the rotation position corresponding to the "intermediate position" (S24), and then the magnetic head 14 is reloaded to the "magnetic head load position" (S26).
Thereafter, the data write / read processing in step S18 described above is executed. Thereafter, the subsequent control procedure is executed.

In the above-described sensor check in step S12, the two states described above, that is, the state where all of the first to third detection sensors 326, 328, and 260 are turned on, or the first detection If it is determined that the output of the sensor 326 is on and the output of each of the second and third detection sensors 328 and 260 is in a sensor output state other than the two states of off, the magnetic head 14 is out of the "magnetic head loading position" (P4), and the disk cartridge 42 is being loaded or unloaded (that is, the disk cartridge 42 is in the "cartridge unload position" (P4)).
Since the power is turned off in the case where the power is turned off in a position other than 1)), it is determined that the power is turned on. Proceeding to step S22, an unloading process is performed, and all control procedures are terminated.
Wait for the next disk cartridge 42 to be inserted.

Next, referring to FIG. 91 and FIG. 92, step S1 in the main routine shown in FIG.
The loading process of No. 6 will be described in detail as a subroutine.

First, when this loading process is called, the drive motor 56 is driven to rotate forward until the second detection sensor 328 is turned off (S16A, S16B, S16).
C). At this point, the disc cartridge 42 is pulled into the “cartridge retraction completed position” (P2) in the cartridge holder 100, and then descends from the “cartridge receiving position” of the cartridge holder 100 to the “cartridge loading position” (P3). Accordingly, the magnetic head 14 is loaded at a position where information can be read by the optical head 16, while the magnetic head 14 is stopped while being lowered from the "standby position" to the "intermediate position". Then, it is determined whether or not the disk cartridge 42 loaded to the "cartridge loading position" (P3) is write-protected (S16D). If the disk cartridge 42 is write-protected, writing of information is prohibited. Therefore, "1" is set to the flag FWP indicating that the writing of this information is prohibited (S16).
E) If no write protection is applied,
Since writing of information is permitted, "0" is reset to a flag FWP indicating that writing of this information is prohibited (S16F).

Thereafter, the spindle motor 44 is set to, for example, 3
The linear motor 134 for the optical head carriage 128 is started so as to move the optical head 16 to the innermost position of the magneto-optical head 12 (S16H). Then, the PEP recorded at the innermost peripheral position of the magneto-optical disk 12 is read (S16I), and it is determined whether the information standard of the magneto-optical disk 12 is ISO standard or ECMA standard (S16).
J). Here, when it is determined that the magneto-optical disk 12 conforms to the ISO standard (YES in S16J), the rotation speed of the spindle motor 44 is increased to 4000 rpm (S16K), and when it is determined that the magneto-optical disk 12 conforms to the ECMA standard. In (NO in S16J), the rotation of the spindle motor 44 is not changed and the rotation is continued while maintaining the rotation speed of 3000 rpm.

Then, it is determined whether or not write protection is applied (S16L). If it is determined that write protection is applied, that is, "1" is set in FWP (YES in S16L). No.), there is no need to lower the magnetic head 14 to the "magnetic head load position" (P4) since information is not written in any information standard. Therefore, the control procedure is terminated at this point, and the process returns to the original main routine.

On the other hand, when write protection is not applied, that is, when “0” is set in FWP (S
At 16L, the linear motor 162 for the magnetic head carriage 68 is driven to move the magnetic head 14 to the outermost peripheral position of the magneto-optical disk 12 (S16).
M) Subsequently, the linear motor 134 for the optical head carriage 128 is driven so that the optical head 16 is similarly moved to the outermost peripheral position of the magneto-optical disk 12 (S16).
N). The optical head 16 thus moved to the outermost position of the magneto-optical disk 12 causes the MFZ indicating whether the magneto-optical disk 12 is for one side or for both sides.
Is read (S160). If it is determined from the read MFZ that the magneto-optical disk 12 is for both sides (YES in S16P), the information cannot be written, so the magnetic head 14 is moved to the "magnetic head load position".
It is not necessary to lower to (P4). Therefore, the control procedure is terminated at this point, and the process returns to the original main routine.

If it is determined that the magneto-optical disk 12 is for one side (NO in S16P), it is possible to overwrite information on the recording layer of the magneto-optical disk 12, and "Magnetic head load position" (P
The magnetic head loading operation for 4) is started. That is, first, the electromagnetic solenoid 290 is excited (S1).
6Q) until the first detection sensor 326 is turned on for at least 20 msec (that is, until the second detection sensor is turned on for the second time).
Are driven (S16R, S16S, S16T). As a part of the initial processing at the time of loading the magneto-optical disk 10, a reflector 154 fixed on the outermost circumference of a carriage arm 148 connected to the optical head carriage 128 at the outermost position of the magneto-optical disk 12. And the magnetic head 14 and the optical head 16 in the radial direction of the magneto-optical disk 12 via a pair of photocouplers 150 and 152 attached to the lower surface of the outermost peripheral portion of the carriage arm 170 connected to the magnetic head carriage 68. Are synchronized with each other (S16U). Thereby, thereafter, the magnetic head 14 and the optical head 16
They move together in a state of being synchronized with each other.

In this embodiment, when the magnetic head 14 and the optical head 16 start synchronizing with each other, the respective carriage arms 170 and 148 are attached to the outermost peripheral position of the magneto-optical disk 12. After moving in advance, the synchronization operation is started. That is, the magnetic head 14 has been previously moved to the outermost position of the magneto-optical disk 12 in step S16M described above, while the optical head 16 has also been moved to the outermost position of the magneto-optical disk 12 to read MFZ. Have been allowed. As a result, there is no need to move the optical head 16 or the magnetic head 14 largely in the radial direction of the magneto-optical disk 12 when starting the above-mentioned synchronization operation, and therefore, the operation period required for this synchronization operation is not required. Is extremely short, and the operation time of the entire loading process can be shortened.

Incidentally, the optical head 16 reads the MF recorded in the outermost peripheral area of the magneto-optical disk 12 in step S160.
To read Z, the optical head 16
2 is provided at a position slightly displaced radially inward from the outermost position. Therefore, as described above, at the time of reading / writing information, the linear motor 162 is drive-controlled so that the magnetic head 14 moves in synchronization with the movement of the optical head 16. At the time of starting to take, the drive of the linear motor 134 is set so that the position of the optical head 16 is synchronized with the magnetic head 14 previously brought to the outermost position.
That is, at the time when the synchronization is started, first, the linear motor 134 is activated to move the optical head 16 to the radially outermost position of the magneto-optical disk 12, and both are moved to the radially outermost position of the magneto-optical disk 12. Activate the synchronization mechanism with the position brought within the synchronization control range,
The magnetic head 14 and the optical head 16 are synchronized.

Here, even when the MFZ is read in the above-described step S160, if the optical head 16 is within the above-described synchronization control range, this optical head 16
The drive of the linear motor 162 can be controlled so that the magnetic head 14 is synchronized with the magnetic head 14.

As described above, the magnetic head 14 and the optical head 1
After synchronizing with each other, the loading process ends, and the process returns to the original main routine.

Next, referring to FIG. 93, FIG.
The unloading process of step S22 in the main routine shown in FIG. 0 will be described in detail as a subroutine.

First, when the unloading process is called, the drive motor 56 is driven to rotate in the reverse direction until the second detection sensor 328 is turned on (S22A, S22B, S2
2C, S22E). In addition, before the second detection sensor 328 is turned on (NO in S22B), the first detection sensor 326 detects that the corresponding slit 322a of the first detection rib 322 enters the detection range. When it is turned on (YES in S22C), electromagnetic solenoid 290
Is demagnetized (S22D). In this way, when the reverse rotation of the drive motor 56 is stopped, the magnetic head 14 is unloaded from the "magnetic head load position" (P4) to the "intermediate position". Thereafter, the drive of the spindle motor 44 is stopped (S22F), and the magnetic head 14 is stopped.
Is driven to move to the outermost position of the magneto-optical disk 12 (S22G).

Then, the process waits until the rotation of the spindle motor 44 is completely stopped (S22H), and is completely stopped, that is, after the rotation of the magneto-optical disk 12 is stopped (S22H).
YES) until the first detection sensor 326 turns on.
The drive motor 56 is driven to rotate in the reverse direction (S22I, S22J,
S22K). As described above, when the first detection sensor 326 is turned on, the cartridge holder 100 moves from the “cartridge loading position” (P3) to the “cartridge receiving position”.
After being raised to the "cartridge receiving position", the disk cartridge 42 in the cartridge holder 100 is moved to the "cartridge retraction completed position".
(P2) to "cartridge unload position" (P1)
Pushed out. Thus, the unloading process ends, and the process returns to the original main routine.

When the disk cartridge 42 is thus brought to the “cartridge unload position” (P1), a part of the disk cartridge 42 projects outward from the bezel opening 34. In this way, the operator can easily grasp a part of the protruding disk cartridge 42 and pull it out of the magneto-optical disk device 10 manually.

It is needless to say that the present invention is not limited to the configuration of the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

For example, in the above-described embodiment, the disk device according to the present invention has been described as being applied to a magneto-optical disk device. However, the present invention is not limited to such an application, but may be applied to an information medium. It is needless to say that the present invention can be applied to an optical disk device using an optical disk, and can also be applied to a magnetic disk device using a magnetic disk as an information medium.

[0248]

As described in detail above, according to the present invention,
Except when loading or unloading the disk cartridge, a disk device that can close the opening for taking in and out the disk cartridge and completely protect the inside from dust is provided. This can be achieved more reliably, and as a result, contamination of the disk housed therein, the built-in optical element, and the like with dust or dirt is effectively suppressed.

[Brief description of the drawings]

FIG. 1 is a front view showing an external configuration of a magneto-optical disk drive to which an embodiment of a disk drive according to the present invention is applied.

FIG. 2 is a right side view showing an external configuration of one embodiment of the magneto-optical disk device shown in FIG.

FIG. 3 is a rear view showing an external configuration of the embodiment of the magneto-optical disk device shown in FIG. 1;

FIG. 4 is a top view showing an external configuration of one embodiment of the magneto-optical disk device shown in FIG. 1;

FIG. 5 is a perspective view showing a disk cartridge in which a magneto-optical disk used in the magneto-optical disk device shown in FIGS. 1 to 4 is rotatably housed, with a shutter in a closed position.

FIG. 6 is a perspective view showing a disk cartridge in which a magneto-optical disk used in the magneto-optical disk device shown in FIGS. 1 to 4 is rotatably stored, with a shutter in an open position.

FIG. 7 is an exploded perspective view schematically showing the internal structure of the magneto-optical disk device shown in FIGS. 1 to 4;

FIG. 8 is a right side view showing a configuration of an attachment mechanism for attaching the front bezel to the main frame.

FIG. 9 is a cross-sectional view showing the mounting mechanism shown in FIG. 8 in a state cut along line AA.

FIG. 10 is a longitudinal sectional view showing the mounting mechanism shown in FIG. 9 in a state cut along line BB.

FIG. 11 is a right side view for explaining a state in which the front bezel is mounted on the main frame in the mounting mechanism shown in FIGS. 8 to 10;

FIG. 12 is a right side view showing a configuration according to a modification of the attachment mechanism shown in FIG. 8;

13 is a cross-sectional view showing a state in which the front bezel of the mounting mechanism shown in FIG. 12 is being mounted on the main frame.

14 is a cross-sectional view showing a state where the front bezel is mounted on the main frame in the mounting mechanism shown in FIG.

FIG. 15 is a left side view schematically showing an internal configuration of the magneto-optical disk device shown in FIGS. 1 to 4;

FIG. 16 is a front view schematically showing an internal configuration of the magneto-optical disk device shown in FIGS. 1 to 4;

FIG. 17 is a side view showing the cartridge holder taken out.

FIG. 18 is a plan view showing a cartridge holder taken out and showing only a left half thereof.

FIG. 19 is a perspective view showing a structure in which an optical base portion is taken out and disposed thereon.

FIG. 20 is a front sectional view showing a mounting state of a linear bearing and a linear motor for an optical head carriage and a linear bearing and a linear motor for a magnetic head carriage.

FIG. 21 is a perspective view showing a structure in which a magnetic head actuator base is taken out and disposed on a lower surface thereof.

FIG. 22 is a perspective view showing the loading chassis taken out.

FIG. 23 is a right side view showing the configuration of the left control cam plate.

FIG. 24 is a left side view showing the configuration of the left control cam plate.

FIG. 25 is a left side view showing the configuration of the right control cam plate.

FIG. 26 is a right side view showing the configuration of the right control cam plate.

FIG. 27 is a diagram for explaining a cam groove shape formed on each control cam plate.

FIG. 28 is a perspective view showing a state where a shutter plate and a shutter plate opening / closing mechanism are taken out.

FIG. 29 is a perspective view showing the shutter plate and the shutter plate opening / closing mechanism taken out from a direction different from FIG. 28;

FIG. 30 is a side sectional view showing a shutter plate opening / closing mechanism in a state where a disk cartridge is not loaded.

FIG. 31 is a side sectional view showing a shutter plate opening / closing mechanism in a state where a disk cartridge is slightly inserted into a chassis opening;

FIG. 32 is a side sectional view showing a shutter plate opening / closing mechanism in a state where a disk cartridge is inserted into an inlet of a cartridge holder.

FIG. 33 is a side sectional view showing a shutter plate opening / closing mechanism in a state where a load / unload mechanism is activated.

FIG. 34 is a side cross-sectional view showing the shutter plate opening / closing mechanism in a state where a locking portion of a movable gear is about to come into contact with a lower surface of a gear chassis from below.

FIG. 35 is a side sectional view showing a shutter plate opening / closing mechanism in a state where a swing lever is rotated to an uppermost position.

FIG. 36 is a side cross-sectional view showing the shutter plate opening / closing mechanism in a state where the swing lever is rotated to the uppermost position and a state where the shutter plate is in a vertical state.

FIG. 37 is a side sectional view showing the shutter plate opening / closing mechanism in a state where the disk cartridge is brought to the loading position and a state where the chassis opening is completely closed.

FIG. 38 is a plan view showing a configuration on a gear chassis.

FIG. 39 is a front view showing the configuration on the gear chassis.

FIG. 40 is a left side view showing the configuration on the gear chassis.

FIG. 41 is a right side view showing the configuration on the gear chassis.

FIG. 42 is a plan view showing a configuration of a bottom plate on a gear chassis and a state of attachment of a link arm.

FIG. 43 is a plan view showing a structure directly attached to the structure shown in FIG. 42 except for the detection / drive gear.

FIG. 44 is a plan view showing a configuration directly attached to the configuration shown in FIG. 43 except for a detection / drive gear.

FIG. 45 is a perspective view showing a configuration around a slide plate.

FIG. 46 is a plan view showing a configuration of a detection / drive gear.

FIG. 47 is a timing chart showing a detection state during a loading operation of the disk cartridge.

FIG. 48 is a timing chart showing a detection state during a loading operation of the magnetic head.

FIG. 49 is a timing chart showing a detection state during an unloading operation of the magnetic head.

FIG. 50 is a timing chart showing a detection state during an unloading operation of the disk cartridge.

FIG. 51 is a timing chart showing a detection state when the magnetic head is forcibly unloaded by the biasing force of the return spring when the power is turned off.

FIG. 52 is a timing chart showing a detection state in a detection / drive gear return operation from the forced unload state shown in FIG. 51.

53 is a timing chart showing a detection state at the same time as the reloading of the magnetic head from the return state of the detection / drive gear shown in FIG. 52.

FIG. 54 is a plan view showing the planar shape of the internal configuration of the magneto-optical disk device in a state where the “cartridge unload position” (P1) is detected.

FIG. 55 is a plan view showing the planar shape of the internal configuration of the magneto-optical disk device in a state where the “cartridge retraction completion position” (P2) is detected.

FIG. 56 is a plan view showing the planar configuration of the internal configuration of the magneto-optical disk device in a state where the “cartridge loading position” (P3) is detected.

FIG. 57 is a plan view showing the planar shape of the internal configuration of the magneto-optical disk device in a state where the “magnetic head load position” (P4) is detected.

FIG. 58 detects the middle position (P5) of unloading from the “cartridge retraction completed position” (P2) to the “cartridge unload position” (P1) as to the planar shape of the internal configuration of the magneto-optical disk device. It is a top view showing in the state where it was performed.

FIG. 59 is a left side view showing a left side shape of the internal configuration of the magneto-optical disk device in a state where a “cartridge unload position” (P1) is detected.

FIG. 60 is a right side view showing the shape of the right side of the internal configuration of the magneto-optical disk device in a state where the “cartridge unload position” (P1) is detected.

FIG. 61 is a left side view showing the left side shape of the internal configuration of the magneto-optical disk device in a state where the “cartridge retraction completion position” (P2) is detected.

FIG. 62 is a right side view showing the shape of the right side of the internal configuration of the magneto-optical disk device in a state where the “cartridge retraction completion position” (P2) is detected.

FIG. 63 is a left side view showing a left side shape of the internal configuration of the magneto-optical disk device in a state where a “cartridge loading position” (P3) is detected.

FIG. 64 is a right side view showing the shape of the right side of the internal configuration of the magneto-optical disk device in a state where the “cartridge loading position” (P3) is detected.

FIG. 65 is a left side view showing the left side shape of the internal configuration of the magneto-optical disk device in a state where the “magnetic head load position” (P4) is detected.

FIG. 66 is a right side view showing the right side shape of the internal configuration of the magneto-optical disk device in a state where the “magnetic head load position” (P4) is detected.

FIG. 67 shows the left side shape of the internal configuration of the magneto-optical disc device in the middle position (P5) where the cartridge is unloaded from the “cartridge retraction completion position” (P2) to the “cartridge unload position” (P1). It is a left view which shows in the state where it was detected.

FIG. 68 shows the right side shape of the internal configuration of the magneto-optical disc device in the middle position (P5) where the cartridge is unloaded from the “cartridge retraction completion position” (P2) to the “cartridge unload position” (P1). It is a right view which shows in the state where it was detected.

FIG. 69 is a left side view showing the front shape of the internal configuration of the magneto-optical disk device in a state where the “cartridge unload position” (P1) or the “cartridge retraction completion position” (P2) is detected. .

FIG. 70 shows the front configuration of the internal configuration of the magneto-optical disc device as “cartridge loading position” (P3) or
It is a left view which shows in the state where "the magnetic head load position" (P4) was detected.

FIG. 71 is a plan view showing the planar shape of the configuration on the gear chassis in a state where the “cartridge insertion detection position” is detected.

FIG. 72 is a plan view showing the planar shape of the configuration on the gear chassis in a state where it is detected that the magnetic head has been forcibly unloaded to the “intermediate position” by the biasing force of the return spring in a power-off state; FIG.

FIG. 73 shows the positional relationship between the disk cartridge and the magnetic head actuator base in the magneto-optical disk device in which the “cartridge unload position” (P1) or the “cartridge retraction completed position” (P2) is detected. FIG.

FIG. 74 is a front view showing the positional relationship between the disk cartridge and the magnetic head actuator base in the magneto-optical disk device in a state where the “cartridge loading position” (P3) is detected.

FIG. 75 is a front view showing the positional relationship between the disk cartridge and the magnetic head actuator base in the magneto-optical disk device in a state where the “magnetic head load position” (P4) is detected.

FIG. 76 is a left side view showing the positional relationship between the disk cartridge, the magnetic head, and the magneto-optical disk in the magneto-optical disk device in a state where the “cartridge retraction completion position” (P2) is detected.

FIG. 77 is a left side view showing the positional relationship between the disk cartridge, the magnetic head, and the magneto-optical disk in the magneto-optical disk device in a state where the “cartridge loading position” (P3) is detected.

FIG. 78 shows the positional relationship between the disk cartridge, the magnetic head, and the magneto-optical disk in the magneto-optical disk device, where "magnetic head load position" (P4) is detected and the magnetic head and the magneto-optical disk are positioned at the outermost periphery. It is a left view shown in the state where it is in a position.

FIG. 79 shows the positional relationship between the disk cartridge, the magnetic head, and the magneto-optical disk in the magneto-optical disk device, where “magnetic head load position” (P4) is detected and the magnetic head and the magneto-optical disk are located at the innermost position. It is a left view which shows in the state in a peripheral position.

FIG. 80 is a front sectional view showing a configuration of a horizontal positioning mechanism.

FIG. 81 is a bottom view showing a lower surface configuration of a magnetic head actuator base provided with a horizontal positioning mechanism.

FIG. 82 is a bottom view showing the configuration of the horizontal positioning mechanism.

FIG. 83 is a side sectional view showing the configuration of the horizontal positioning mechanism.

FIG. 84 is a side view showing an attached state of the lock mechanism.

FIG. 85 is a side view showing a locked state of the lock mechanism.

FIG. 86 is an enlarged bottom view showing the configuration of the lock mechanism.

FIG. 87 is an enlarged side sectional view showing a configuration of a lock mechanism.

FIG. 88 is a plan sectional view showing the configuration of the laser optical system.

FIG. 89 is a diagram illustrating a mounting configuration of a beam splitter.

FIG. 90 is a flowchart showing a control procedure of the overall control in the control circuit.

FIG. 91 is a flowchart showing a control procedure as a subroutine when a loading process is called in the main routine shown in FIG. 90;

FIG. 92 is a flowchart showing, as a subroutine, a control procedure in a case where loading processing is called in the main routine shown in FIG. 90;

FIG. 93 is a flowchart showing, as a subroutine, a control procedure in a case where unloading processing is called in the main routine shown in FIG. 90;

[Explanation of symbols]

X Loading direction Y Movement direction of shutter 46 Z Mounting reference plane 10 Magneto-optical disk drive 12 Magneto-optical disk 12a Disk body 12b Hub 14 Magnetic head 16 Optical head 18 Main frame 18a Base 18b Rising part 18c Falling part 20 Mounting mechanism 22 Front Bezel 24 Optical head mounting base 24a; 24b Rear position regulating pin 26 Loading chassis 26a Front part 26b Left side part 26c Right side part 26d Left concave part 26e Right concave part 26f; 26g Front position restricting piece 28 Upper cover 30 Rear cover 32 Control room rear cover 32a ventilation hole 34 bezel opening 36 chassis opening 38 shutter plate 40 shutter plate opening / closing mechanism 42 disk cartridge 42a access opening 42b motor opening 42c; 42d Inclined surface 42e Hook groove 44 Spindle motor 46 Shutter 46a Recess 48 Shutter release mechanism 50a; 50b Open arm 52 Automatic load / unload mechanism 56 Drive motor 56a Worm gear 60 Timing detection mechanism 62 Magnetic head mounting base 64 Vertical positioning mechanism 66 Horizontal Direction positioning mechanism 68 Magnetic head carriage 70 Lock mechanism 72 Laser optical system 74 Beam splitter 76 Locking hook 76a Rising section 78 Mounting plate section 80 Mounting screw 82 Mounting groove 84 Locking groove 84a Upper protruding groove section 86 Mounting piece 88 Screw groove 90 Connection Plate 92 Mounting stay 94 Mounting stay 96 Locking projection 98 Locking hole 100 Cartridge holder 100a Top plate 100b Bottom plate 100c; 100 d Side plate 100e Lower opening 100f Upper opening 100g Side opening 102; 104 Control cam plate 102a ₁ ; 102a ₂ ; 104a ₁ ; 104a ₂
Cam groove 102b ₁ ; 102b ₂ ; 104b ₁ ; 104b ₂ for vertical movement of cartridge holder
104c cam groove for opening and closing the shutter plate 102d; pressing concave groove 102e; 104e engaging concave portion 106a; 106b; 106c; 106d cam pin 108a; 108b; 108c; 108d mounting stay 110 support shaft 112 Guide groove 114 Torsion spring 116 Drive mechanism 118 Gear chassis 118a; 118b Side plate 118c Top plate 118d Bottom plate 120 Synchro servo board 122 Heat sink 124a; 124b Control board 126 Linear bearing 128 Optical head carriage 130 Coil 132 Yoke 134 Linear motor 136 Fixing member 138 Movable member 140 Bearing ball 146 Objective lens 148 Carriage arm 150; 152 Photocoupler 154 Radiation plate 156 linear bearings 158 coil 160 yoke 162 a linear motor 164 fixed member 166 movable member 168 bearing ball 170 carriage arm 172 load beam 174 fixing screws 176 magnetic head pressing plate 178a; 178b; 178c; 178d cam pins 180a _1; 180a _2; 180b ₁ ; 180b ₂
182a ₁ ; 182a ₂ ; 182b ₁ ; 182b ₂
Second vertical groove 184a; 184b Cam pin 186a; 186b Opening 188; 190 Mounting stay 192; 194 Guide groove 196; 198 Guide pin 200a; 200b; 200c; 200d Pressing piece 202; 204 Wire spring 206; 208 Support pin 210; 212 Swing lever 214; 216 cam pin 218; 220 torsion spring 222 support shaft 224 movable gear 226 fixed gear 228 torsion spring 230 locking portion 232 engagement mechanism 234 detection / drive gear 234a small-diameter gear portion 234b large-diameter gear portion 234c boss Part 234d recess 236 gear train 238; 240; 242 driven gear 244; 246; 248 pivot pin 250 detection lever 250a detected piece 252 pivot pin 254 first guide groove 256 pivot pin 258 Torsion spring 260 Third detection sensor 262 Follower pin 264 Slide plate drive mechanism 266 Pull-in link 266a Bifurcation 268 Slide plate 268a Engagement piece 270 Pin 272 Shaft support pin 274 Cartridge hook 274a One piece 274b The other piece 276 Drive pin 278 Drive cam groove 280 Control cam plate drive mechanism 282 Axial support pin 284 Link arm 286 Transmission arm assembly 288 Forced return mechanism 290 Electromagnetic solenoid 290a Suction surface 292a; 292b Engagement pin 294 Second guide groove 296 Third guide Groove 298 Drive pin 300 Solenoid arm 300a Suction piece 300b Lock section 302 Support pin 304 Eject arm 306 Guide pin 308 Torsion spring 310 Gear arm 310a Claw portion 310b Right end 312 Lock arm 312a One piece 312b Recess 312c The other piece 314 Shaft support pin 316 Torsion spring 318 Return spring 320 Eject pin 322 First detection rib 322a Slit 324 Second detection rib 326 First Detection sensor 328 second detection sensor 330 torsion spring 330a one end 330b other end 332a; 332b recess 334a; 334b rear positioning pin 336 shaft support pin 338 preload link arc 338a rear extension piece 338b downward extension piece 340 preload slide Plate 340a Locking portion 342 Shaft support pin 344 Preload arm 344a One piece 344b The other piece 344c Locking portion 346 Preload spring 348 Cam pin 350 Press pin 352 Contact portion 354 Lock hook 356 Lock lever 358 Mounting mechanism 360 Mounting stay 362a; 362b Supporting piece 364 Supporting shaft 366 Torsion spring 368 Optical system housing 370 Semiconductor laser 372 Collimator lens 374 Photodiode 376 Photosensor 378 Condensing lens 380 Polarizing beam splitter 382 First triangular prism 382a first orthogonal plane 382b second orthogonal plane 382c slope 384 second triangular prism 384a first orthogonal plane 384b second orthogonal plane 384c slope 386 eject switch

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shun Takishima 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Optical Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 17 / 04

Claims (5)

(57) [Claims] An opening for taking in and out a disk cartridge accommodating a disk as a recording medium is formed on one side, and a housing having a dustproof structure inside except for this opening; and a housing accommodated in the housing. A shutter plate for opening and closing the opening; and a shutter plate opening / closing means for driving the shutter plate to open in response to the insertion / removal of the disk cartridge. And a disc cartridge inserted into the housing by a predetermined amount while the shutter plate is rotated against the urging force of the urging means. In response to this, the shutter plate is maintained in its rotating posture, and Disk apparatus characterized by comprising moving means for moving in a direction away from the ink cartridge. 2. The apparatus according to claim 1, wherein said moving means comprises a pair of swing levers swingably supported on an inner surface of said housing along a direction orthogonal to a direction in which said disk cartridge is inserted, and a predetermined amount or more of said disk cartridge. And a pair of cam plates formed with cam grooves into which cam pins respectively fitted to the two swing levers are fitted, and the shutter plate is provided at a tip of the swing lever. The urging means is mounted so as to pivotally urge the shutter plate around the tip of the oscillating lever, and the oscillating lever is responsive to the movement of the cam plate. 2. The apparatus according to claim 1, wherein the shutter plate is moved in a direction away from the disk cartridge based on a change in an engagement position between the cam pin and the cam groove. Disk apparatus. 3. The urging means includes a fixed gear fixed to the shutter plate, a movable gear rotatably supported by the swing lever and meshing with the fixed gear, and a movable gear. A spring member for urging the shutter plate in a closing direction, wherein the disc cartridge inserted through the opening is pressed into the shutter plate at its tip,
3. The disk device according to claim 2, wherein the shutter plate is rotated in a direction to open the opening against a biasing force of the spring member. 4. The moving means includes an abutting portion disposed so as not to be relatively movable with respect to the housing, and the movable gear is configured to move the shutter plate in response to swing of the swing lever. 4. The disk device according to claim 3, wherein when the disk device is moved in a direction away from the disk cartridge, the disk device comes into contact with the abutted portion and maintains its rotating state. 5. The apparatus according to claim 1, further comprising an automatic loading means which engages with a disc cartridge inserted by a predetermined amount into said housing and draws and drives the disc cartridge in a direction in which the disc cartridge is further inserted. The disk device as described above.