JPH0452879Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information recording/reproducing device using a base suitable for dustproofing.

[Prior Art] In an information recording/reproducing device such as an optical disk or a magnetic disk, various members such as an access mechanism such as a spindle motor, a pick-up, and a voice coil motor (VCM) are fixed to a frame body called a base, and the outside thereof is fixed to a frame body called a base. A common configuration is to cover it with an exterior case.

By the way, information recording/reproducing devices generally cannot perform their various functions satisfactorily if dust enters the device, and it is a problem to deal with dust. In particular, if dust accumulates on the pickup or disk, the recording and reproducing sensitivity will be significantly reduced, which is a problem. Conventionally,
Countermeasures have been taken such as creating a completely sealed casing or installing a fan to blow away dust, but both of these are undesirable as they complicate the structure.

The structure of the conventional base, for example, is
As shown in No. 236153, various members are attached to the upper surface of the base.

[Problems to be solved by the invention] However, in the conventional example described above, this structure leaves various components completely exposed and unprotected against dust that enters through the heat dissipation openings or media entry/exit openings provided in the outer case. Therefore, it is not possible to prevent dust from adhering.

The present invention has been devised in view of the above-mentioned points, and an object of the present invention is to provide an information recording/reproducing device that has a simple structure and can prevent dust from entering.

[Means and effects for solving the problem] The magneto-optical recording and reproducing apparatus of the present invention includes inserting a cartridge containing a magneto-optical recording medium through an insertion slot in a first direction parallel to the surface of the magneto-optical recording medium. After the cartridge holder is held by the cartridge holder, the magneto-optical recording medium is engaged with the driving means by moving the cartridge holder a predetermined distance in a second direction perpendicular to the surface of the magneto-optical recording medium. a magnetic field applying means for applying a magnetic field to the magneto-optical recording medium, and an optical pickup drive for reciprocating the optical pickup along a guide rail in a direction across the information track of the magneto-optical recording medium. In the magneto-optical recording and reproducing apparatus, the cartridge holder and the guide rail have a surface parallel to the surface of the magneto-optical recording medium, and the magneto-optical recording medium has a surface parallel to the magneto-optical recording medium. A plate member having a U-shaped cross section and having a minimum opening that does not interfere with the arrangement of a power transmission mechanism for driving radiation and the magneto-optical recording medium is arranged. be.

[Example] The present invention will be specifically described below with reference to the drawings.

1 to 12 relate to one embodiment of the present invention, FIG. 1 is a perspective view showing the outer shape of a base used in one embodiment, and FIG. 2 is a side view showing the loading mechanism portion of one embodiment. , FIG. 3 is a schematic side view of one embodiment, FIG. 4 is a plan view of one embodiment, FIG. 5 is a side view showing a means for releasing the retainer during loading, and FIG. 6 is a plan view of the base. FIG. 7 is a perspective view showing a cartridge holder, FIG. 8 is a perspective view showing a disk cartridge, FIG. 9 is a plan view showing a bias magnetic field applying means, and FIG.
11 is a sectional view taken along line B-B' in FIG. 9, and FIG. 12 is an explanatory view showing how the bias applying means is raised and retracted when a disk cartridge is inserted.

Magneto-optical information recording and reproducing device 1 according to a first embodiment
As shown in FIG. 3, the base 3 can be fixed in the housing 2 via unillustrated pillars provided at approximately four corners. In this base 3, a cartridge holder 7 is provided with an opening that serves as an insertion opening 6 for a disk cartridge 5 that stores a disk 4 as a disk-shaped recording medium (see FIG. 8). It can be mounted so that it can be moved.

As shown in FIG. 7, the cartridge holder 7 has a substantially square or rectangular top surface, and both sides of the cartridge holder 7 are bent into a U-shape so that the disk cartridge 5 can be inserted into the inside thereof. Approximately in the center of the upper surface of the cartridge holder 7 is a substantially rectangular opening 8a whose insertion direction (of the disk cartridge 5) is the longitudinal direction;
A circular opening 8b communicating with a is provided. A bias magnetic field applying device 9 for applying a magnetic field during magneto-optical recording or erasing is retractably attached to this rectangular opening 8a.

The base 3 on which the cartridge holder 7 is movably attached to the upper side is made by folding both ends of a rectangular flat plate at right angles to have a U-shaped cross section, as shown in FIG. 1 or FIG. 6. Various components can be stored in the space below the folded base 3. Further, the end of the disk 4 (or the disk cartridge 5) opposite to the insertion opening (referred to as the front end) is folded downward to prevent dust from entering. This base 3 is provided with a through hole 12, through which a rotating shaft 11 of a spindle motor passes, at a position near the center of the base 3 and slightly closer to the insertion port 6 in the width direction.

The periphery of the upper surface of this through hole 12 is formed into a concave shape such that a turntable (not shown) can be attached thereto. A disk 4 is mounted on the top of this turntable and is rotationally driven by a spindle motor.

A rectangular opening 14 is provided from the portion adjacent to the through hole 12 to the front end portion which is the deep portion of the disk 4 in the insertion direction. A carriage 15 (see FIG. 4) equipped with an optical pickup is movably mounted inside the base 3 below the opening 14 along the longitudinal direction of the opening 14.
This carriage 15 is moved by a coarse movement mechanism 16 (see Fig. 3) using a voice coil motor, and when the optical pick-up attached to this carriage 15 is moved, the objective lens passes through the aperture 14 and is attached to the disk mounted on the upper side. They are arranged so as to face each other at a distance close to the four surfaces, and a light beam focused by this objective lens is irradiated onto the disk 4. Incidentally, the carriage 15 is moved along guide rails 17, 17 (see FIG. 4).

Further, an autoloading motor 18 is housed in the lower part near the rear end of the base 3, which is on the insertion opening side of the disk cartridge 5.
(see figure).

In this way, in one embodiment, within the housing 2,
Disk 4 (or disk cartridge 5)
The total opening area (almost all 1
The upper surface of the base 3 has a dust-proof function. Incidentally, as shown in FIG. 3, dustproof plates 19a and 19b are attached above the cartridge holder 7 and below the base 3.

2 or 5 on one side of the base 3.
A base plate 20 is attached as shown in the figure. As shown in FIG. 4, arms 22, 22 extend horizontally from the upper side of the base plate 20 via a U-shaped support piece 21, and a disk clamp member 23 is attached to the tip side of the arms 22, 22. is installed.

A shaft 24 is provided in the elongated hole provided in the U-shaped support piece 21.
is suspended horizontally, and a shaft collar 25 is interposed on this shaft 24 to pivotally support one end of the arms 22, 22.

A hole is provided at an appropriate distance from the pivoted end portions of the pair of arms 22, 22, and a shaft 32 passes through the hole in the opposing portion. Piece 33, 33
It is supported by Note that a shaft collar 22a is loosely inserted through the shaft 32 between the arms 22, 22. Therefore, the shaft 32 passed through between the arms 22, 22
By extending and supporting the arms 22, 22 to the front and rear positions, the shaft 32 and the cartridge holder 7 can be inserted into the holes of the arms 22, 22 during autoloading or ejecting operations. Moved back and forth. In addition, during the above autoloading operation, the cartridge holder 7 is moved forward and then lowered in a 1/4 arc, so the shaft 32 is also lowered, and the pair of arms 2
2 and 22 are shafts 2 pivoted near the upper end of the base plate 20;
4 and 29 as fulcrums, the distal ends of the arms 22 and 22 rotate and descend, and at this time, the disk 4 is rotatably clamped by the disk clamp member 23 pressing the area around the center hole 4A.

Furthermore, when the disk cartridge 5 is inserted, the bias magnetic field applying device 9 is configured to be pushed upward and retracted at the upper corner of the tip of the inserted disk cartridge 5, as will be described later. Furthermore, when the disk 4 is lowered and set to the mounted state, the bias magnetic field applying device 9 is also lowered and installed at an upper position close to the disk 4, and applies a bias magnetic field necessary for recording or erasing. I have made it possible.

Note that when the cartridge holder 7 is lifted from the attached state by the eject operation, the shaft 32 also rises, so the pair of arms 22, 22 rotate around the pivoted shaft 24 and rise. Then, the clamp member 23 rises and retreats.

By the way, the disk cartridge 5 has a structure as shown in FIG. 8, for example.

That is, the disk cartridge 5 housing the disk 4 inside forms a cartridge main body 36 by integrating an upper cartridge portion 35A and a lower cartridge portion 35B. This cartridge main body 36 has a disk 4 in the center thereof when the device is used.
A circular opening 37 is provided so that it can be clamped from both the upper and lower sides, and recording and reproducing openings 38 are provided on both the upper and lower sides from this opening 37 to the portion that will be the tip side (when inserted).

Inside the openings 37, 38, the openings 37,
A pair of scissor-shaped shutter blades 39a and 39b are housed so as to cover each side of the disk 4 facing the disk 38.

The ends of each pair of shutter blades 39a, 39b are pivotally supported by pins 41a, 41b fixed to the rear left and right corners of the cartridge main body 36,
Coil springs 42a and 42b, respectively, near the ends.
The pair of shutter blades 39a and 39b are urged to close together.

On the other hand, slide grooves 43a and 43b are provided on both sides of the cartridge body 36, and hooks 44a and 4 are provided in each of these slide grooves 43a and 43b.
4b is attached so that it can slide freely, and each hook 4
4a and 44b are fixed at one end of wires 45a and 45b, respectively, and the other end is fixed to a guide roller 46.
Shutter blades 39a, 39b via a, 46b
is fixed to the front end of the Therefore, each hook 44
By sliding the pins a and 44b from the state shown in FIG. 8 along the slide grooves 43a and 43b as shown by arrows A and B, the pins 41a and 41b are removed.
Each shutter blade 39a, 39b can be opened centering on the shutter blade 39a, 39b.

The hooks 44a, 44b protrude to the outside of both sides of the cartridge holder 7, and the hooks 44a, 44b protrude to the outside of the rear ends of both sides of the disk cartridge 5 into which the disk cartridge 5 is inserted in order to attach the disk cartridge 5. The hooks 44a and 44b are brought into contact with each other in a protruding state to restrict their movement, while the disk cartridge main body 36 side is inserted, so the hooks 44a and 44b (the position of which moves with the insertion operation) are inserted into the slide groove 43.
a, 43b, and as the disk cartridge main body 36 is inserted, the pair of shutter blades 39a, 39b on both the upper and lower sides of the disk 4 are opened, and the disk 25 is clamped and recorded, played back, or erased. I am trying to prepare for the situation.

As described above, the cartridge main body 36 is provided with positioning holes 34a and 34b penetrating vertically on both left and right sides of its front portion.

Openings 37 and 38 provided on the upper and lower surfaces of the cartridge body 36 each form a pair of shutter blades 3.
A disk 4 having a center hole 4A is housed between the pair of shutter blades 39a and 39b which are opened and closed by shutter blades 9a and 39b.

By the way, the autoloading mechanism (automatic loading mechanism) that moves the cartridge holder 7 forward and automatically sets the disk 4 to the loaded state is constructed as follows.

Adjacent to the lower position of the base plate 20 and the rear part of the lower position, for example, FIGS. 2, 3, and 5
As shown in the figure, shafts 46, 4 are attached to both sides of the base 3.
7, 46, 47 are pivotally supported, and these shafts 46, 47
The same gears 48 and 49 with large diameters are attached to the shafts 48 and 49, and these gears 48 and 49 mesh with gears 52 and 52 with small diameters at both ends of a shaft 51 horizontally suspended below the center of both shafts. The gears 52,5
2, the same gear 4
8, 48, 49, and 49 can be rotated.

A gear (not shown) is attached to the intermediate portion of the shaft 51, and this gear meshes with a gear attached to the rotating shaft of the motor 18 as an autoloading drive source.

The motor 18 is fixed to the base 3 via an L-shaped fixing plate 54 (see FIG. 4).

By the way, as shown in FIG. 7, there are two locations at the front and back at the lower end of each side of the cartridge holder 7.
A pair of guide pieces 55, 55, 56, 56, respectively
protrudes downward. Each guide piece 55
Alternatively, 56 is provided to protrude inward from both ends of the cartridge holder 7 to prevent the width of the device from increasing.

Each of the guide pieces 55 and 56 has a pin 58 or 59 projecting outward in the horizontal direction. (See Figures 1, 2, 3, and 5).

By the way, as shown in FIG. 2, for example, holes are provided in portions facing the inner ends of the shafts 46, 47 arranged in parallel in the front and back, respectively.
Guide plates 63 for guiding the movement of the cartridge holder 7 are attached symmetrically to both sides of the base 3 in a rotatable state.

The guide plate 63 has figures 1, 2, and 3.
As shown in FIG. 5, a linear hole 64 extends linearly in the horizontal front-rear direction, and an arcuate hole 65 communicates with the linear hole 64 and extends in an approximately 90° arc shape. A pair of guide holes 66 are provided at the front and rear, and each pin 58, 59 is connected to the guide hole 6, respectively.
6 (numerals 64 and 65 are shown only in FIG. 2).

Therefore, the autoloading motor 18 is rotated to rotate the small diameter gears 52, 52, and the large diameter gears 48, 4 meshing with the gears 52, 52 are rotated.
9, 48, 49 are rotated, the pins 58, 59 protruding from the respective guide pieces 55, 56 of the cartridge holder 7 engage the gears 48, 49, 48, 49.
The guide hole 66 of the guide plate 63 can be moved by being pressed by the side walls of the elongated holes 61 and 62. By moving each of the guide pieces 55 and 56 along the guide hole 66, the disk cartridge 5 inserted from the insertion opening 6 of the cartridge holder 7 is moved forward together with the cartridge holder 7, and then the disk cartridge 5 is moved forward together with the cartridge holder 7. The disk 4 is lowered while being moved so that the disk 4 can be placed on a turntable attached to a rotating shaft 11 of a spindle motor.

In one embodiment of the autoloading mechanism that moves the cartridge holder 7 and guides the disk 4 to a predetermined mounting position, gears 48 and 49 mesh with gears 52 and 52 that are rotationally driven by the rotation of the motor 18. , 48, 49 to move the pins 68, 69 protruding from the respective guide pieces 55, 56 of the cartridge holder 7 along the guide hole 66 of the guide plate 63. This allows for more efficient force transmission than when rotating the cartridge holder to drive the cartridge holder.

That is, as shown in FIG. 2 or FIG.
Gears 48, 49 mesh with this by the rotation of 2.
The gears 48 and 4 rotate around their central axes 46 and 47.
It is rotated by a force acting in the radial and diametrical directions to reach each meshing point at a constant radius (length) R position of 9. In other words, force is effectively transmitted.

Also, the gears 48, 4 into which the pins 58, 59 are engaged
9 or the guide hole 66 of the guide plate 63 is located at a distance within the radius from the center of the gears 48, 49. pin 58,
59 can be driven. For this reason, the drive motor 18
As a result, it can be used with a small driving force, and the device can be made smaller. Further, when moving the cartridge holder 7, each position on the way is controlled by gears 48,
The rotation angle of 49 is reliably defined, and the timing of locking, etc., which will be described later, can be performed accurately, and the design is easy and the operation is reliable, improving the reliability of the device. be.

By the way, in one embodiment, when the disk cartridge 5 is inserted to a predetermined position, a micro switch ( By pressing the switch lever of this micro switch and turning it on, the motor 18 is operated to move the disk cartridge 5 to the cartridge holder 7.
It is also designed to guide the disk 4 in the direction of the mounting position.

When the loading motor 18 is activated and the guide pieces 55 and 56 are moved to move the cartridge holder 7 in the mounting direction, the disc cartridge 5 is securely moved in the mounting direction without detaching or falling out. A means for preventing or preventing the disk cartridge 5 from coming off is provided so that the disk cartridge 5 can be guided.

That is, as shown in FIG. 4 or FIG. 7, a pair of projecting pieces 71, 71 are provided at one corner of the front end side of the cartridge holder 7, facing each other in the left-right direction. As shown in FIG. 4, a shaft 72 is horizontally suspended between these projections 71, 71,
2, a shaft collar 73 and shaft collars 74, 74 on both sides of this shaft collar 73 are interposed, and a substantially T-shaped retaining piece 75 is attached to a pair of bent portions 76, 76 bent downward at one end of the shaft 72. It is pivoted with a hole through which it can pass.

A hole is provided in the bent portions 76, 76 at a position below the hole, and a roller 78 (see FIG. 5) is horizontally suspended.

Near the tip of the retaining piece 75, there is a substantially truncated conical projection 79 facing downward (see FIGS. 4 and 5).
is fixed, and the tip of this protrusion 79 faces the hole 81 provided on the upper surface of the opposing cartridge holder 7. When the retaining piece 75 is rotated, the protrusion 7
9 is rotated downward, the hole 81
, and can be inserted into the hole 34b (see FIG. 5) of the disk cartridge 5 facing below the hole 81.

On the upper surface of the retaining piece 75, the other end of a leaf spring 84, which is provided with a locking part 83 whose tip is bent into a semicircular shape, is bent and fixed at a position near the pivot point.

On the other hand, a release piece 85 for releasing the retainer is erected on one (left side) side of the base 3, and the upper end side of this release piece 85 is bent in the horizontal direction, and the bent part (the rear is the upper part). ) slope 8
It is set to 6.

The slope 86 is set at a height opposite to the locking part 83 of the leaf spring 84 on the upper part of the bent part 76.

Therefore, when the disk cartridge 5 is not installed (or in a similar state), the cartridge holder 7 is on the rear side of the movable range (with respect to the front-rear direction). In this case, the locking portion 83 at the tip of the leaf spring 84 is in a state closer to the slope 86 than in the state where it is in contact with the slope 86, and the locking portion 83 is guided by the slope 86 and climbs the slope 86, and follows this. The retaining piece 75 is in the rotated state shown in FIG. 5, and the protrusion 79 at the tip of the retaining piece 75 is held in a retracted state outside the hole 81 of the cartridge holder 7.

However, the disk cartridge 5 is inserted into the insertion slot 6.
the disk cartridge 5 is inserted until the tip of the disk cartridge 5 is near the front end of the cartridge holder 7,
The roller 78 slightly in front of the switch lever of the micro switch is pushed, and the leaf spring 84 is bent back, and the leaf spring 84 is rotated clockwise around the shaft 72 that pivotally supports the retaining piece 75, and the tip of the leaf spring 84 is The protrusion 79 moves downward, and the disk cartridge 5
It engages in the positioning hole 34b, thereby preventing the disk cartridge 5 from coming off. When the protrusion 79 is engaged in the hole 34b and is prevented from coming out, the tip of the disk cartridge 5 presses the switch lever of the micro switch to turn on the switch, and the loading motor 18 is turned on.
will be activated. Thus, the disk cartridge 5 is held in a non-removal state, and the disk cartridge 5 is moved and guided in the insertion direction together with the cartridge holder 7, and is rotated and lowered to be set in a predetermined installed state.

Furthermore, there is a protrusion 87 with a small protrusion at a position in front of the protrusion 79 at the tip of the retaining piece 75 (see Fig. 5).
is attached, and when the leaf spring 84 is separated from the release piece 85 and the protrusion 79 is engaged in the positioning hole 34b of the disk cartridge 5, the protrusion 87 will come into contact with the upper surface of the disk cartridge 5 around the hole 34b. Abuttingly, the disk cartridge 5 is held in place within the cartridge holder 7.

By the way, as shown in FIG. 2, a disk cartridge positioning base 88 is fixed to the base 3 near the insertion opening 6, and the disk 4 is mounted on the turntable and clamped by the clamp member 23. In this case, the rear end side of the disk cartridge 5 is supported, and the disk cartridge 5 is positioned in the vertical direction. A micro switch (not shown) is installed adjacent to the positioning table 88 with its switch lever facing upward, and when the disk cartridge 5 is lowered, the switch is switched and the motor 18 in the operating state is switched. Power is cut off. This microswitch is configured so that it can be switched when the disk cartridge 5 is in contact with the positioning table 88.

As shown in FIG. 1, protrusions 91, 91 for cartridge positioning are provided at the back of the insertion slot 6 in the base 3 at positions near both sides. When it is lowered, it is inserted into the left and right holes 34a and 34b near the tip of the disk cartridge 5, and then the protrusion 9
The distal end side of the disk cartridge 5 is supported at two locations on the left and right by the step portions 93, 93 of No. 1 and 91.

When the disk 4 is set to the attached state, the disk cartridge 5 is supported at the bottom of the cartridge by three places as described above, but as described below, the disk cartridge 5 is supported from above. It is designed to be elastically clamped.

That is, as shown in FIG. 7, FIG. 4, FIG. 2, and FIG. , plate springs 96, 96 bent into an arc shape are fixed to each opening 95 with screws.

The downwardly convex top of the leaf spring 96 is slightly higher than the top surface when the disk cartridge 5 is inserted into the cartridge holder 7 (see Fig. 2).
The back side of the disk cartridge 5 when the disk 4 is attached is the cartridge holder 7.
When it is slightly raised from the bottom surface and supported by the positioning member, it can be elastically clamped from above by leaf springs 96, 96.

The positions that are elastically clamped by the leaf springs 96, 96 are, for example, two positions on the left and right near the insertion port 6.

By the way, the bias magnetic field applying device 9 has a first
As shown in FIG. 9, for example, three T-shaped yokes 99, 9 are installed along the longitudinal direction of the yoke 98 whose cross section is approximately U-shaped as shown in FIG.
9 and 99 are attached in series with a slight distance between them. Therefore, the T-shaped yoke 99, 99, 9
Coils 101, 101, 1 are installed on the main body of 9, respectively.
01 are respectively wound to form three bias magnetic field coil elements 102a, 102b, and 102c. These bias magnetic field coil elements 102a,
102b and 102c form a bias magnetic field applying means that covers the recording area in the radial direction of the disk 4, and a bias magnetic field coil element that faces the portion of the disk that is irradiated with a light beam by pickup during recording or erasing mode. 1
The required magnetic field can be applied by supplying current to 02i (i = either a, b, or c), and by supplying current to one of the divided parts, the amount of heat generated can be reduced, and the electric power can be reduced. It is designed to reduce consumption.

The yoke 98 is fixed with screws to a mounting bracket 104 that covers the outer surface of the upper side of the yoke, and the mounting bracket 104 is attached to the cartridge holder 7 on both sides of the opening 8a while the yoke 98 is loosely fitted into the opening 8a of the cartridge holder 7. It is attached to the upper surface of the holder 7. That is, the mounting bracket 104 is provided with pin holes at four locations, and as shown in FIG. 10, a pin 106 with a coil spring 105 interposed therein is passed through each pin hole, and the tip of each pin 106 is connected to a cartridge holder. It is fixed at 7.

As shown in FIG. 10, the coil spring 105 always elastically biases the mounting bracket 104 toward the inside of the opening 8a, that is, toward the bottom. In this state, the lower ends of the yoke 98 and the T-shaped yoke 99 fixed to the mounting bracket 104 protrude downward from the upper surface of the disk cartridge 5 inserted into the cartridge holder 7, and are set at a distance close to the disk 4. has been done. Therefore, in this state, each coil 10
When a current is applied to the disk 1, a magnetic field required for recording or erasing can be applied to the disk 4.

By the way, when the disk cartridge 5 is attached or detached, it is necessary to evacuate the bias magnetic field applying means that protrudes inside the loading path of the disk cartridge 5. In one embodiment, a mounting bracket 1 to which the bias magnetic field applying means is attached is provided.
04 as coil spring 105, 105, 105, 10
Elevating guide members 107, 107 are provided so as to be elastically attached while ensuring a stroke amount that can be retracted by the disk cartridge 5. At the end of the yoke 98 housed in the opening 8a in the insertion/removal direction of the disk cartridge 5,
When the disk cartridge 5 is inserted, lifting guide members 107, 107 are attached with screws or the like to press the tip of the disk cartridge 5 and move it upward. Moreover, this elevating guide member 107,
The disk cartridge 5 pushed up by the disk cartridge 107 is inserted close to the installation position, and the opening 38 of the disk cartridge 5 is pushed up by the lifting guide members 107, 1.
When it reaches the position facing 07, the pressure is released and it is lowered by the biasing force of each coil spring 105. In order to smoothly ascend and descend, the lower front and rear ends of the elevation guide members 107, 107 have tapered surfaces 107a, 107a cut out in a tapered shape.
is formed. Therefore, for example, when the disk cartridge 5 is inserted, its tip ends up on the tapered surface 1.
The state shown in FIG. 12, in which the contact point 07a is reached, is reached. When further inserted from this state, the tapered surface 107a
is pressed, and the mounting metal fittings 104 biased by each coil spring 105 are retracted upward. When the opening 38 on the upper surface of the disk cartridge is exposed to the lower side of the mounting bracket 104, each coil spring 1 is no longer pressed.
With the urging force of 05, the bias applying means returns to the state of protruding inside the opening 8a.

According to one embodiment configured in this manner, for the disk 4 to be attached and detached, there is a space portion in which the disk 4 is housed, and a space in which members of the access mechanism for the disk 4 that are easily affected by dust are housed. The upper surface of the base 3 is used to partition the upper surface of the base 3, thereby reducing the opening area of the upper surface of the base. In other words, if dust adheres to the voice coil motor that forms the access mechanism or the guide rails 17, 17 that move the carriage 15, it will cause wobbling during movement, but the upper surface of the base 3 will not record.
Since only the rectangular opening 14 necessary for reproduction and erasing is substantially provided, the influence of dust can be reduced compared to the conventional example.

Furthermore, the invention is not limited to those in which the recording medium is disk-shaped and driven to rotate, but can also be applied to devices that perform recording, reproduction, erasing, etc. on card-shaped recording media.

[Effects of the invention] As explained above, since the plate member having a U-shaped cross section is placed between the cartridge holder and the guide rail of the optical pickup, dust can be removed from small gaps such as the cartridge insertion slot. Even if an intrusion occurs, the plate member prevents the dust from scattering, and as a result, the adhesion of dust to the guide means of the optical pickup can be suppressed as much as possible. This has the effect that the access mechanism of the optical pickup can maintain its functionality over a long period of time.

[Brief explanation of the drawing]

1 to 12 relate to one embodiment of the present invention, FIG. 1 is a perspective view showing the outer shape of a base used in one embodiment, and FIG. 2 is a side view showing the loading mechanism portion of one embodiment. , FIG. 3 is a schematic side view of one embodiment, FIG. 4 is a plan view of one embodiment, FIG. 5 is a side view showing a means for releasing the retainer during loading, and FIG. 6 is a plan view of the base. FIG. 7 is a perspective view showing a cartridge holder, FIG. 8 is a perspective view showing a disk cartridge, FIG. 9 is a plan view showing a bias magnetic field applying means, and FIG.
11 is a sectional view taken along line B-B' in FIG. 9, and FIG. 12 is an explanatory view showing how the bias applying means is raised and retracted when a disk cartridge is inserted. 1... Information recording and reproducing device, 2... Housing, 3...
Base, 4... Disc, 5... Disk cartridge, 6... Insertion slot, 7... Cartridge holder, 8a... Opening, 9... Bias magnetic field applying device, 14... Opening, 15... Carriage, 18...
...Motor, 23...Disc clamp member, 9
8,99...Yoke, 101...Coil, 104
...Mounting bracket, 105...Coil spring, 106
... Pin, 107 ... Lifting guide member, 107a
...Tapered surface.

Claims (1)

[Claims for Utility Model Registration] A cartridge containing a magneto-optical recording medium is inserted into the insertion slot in a first direction parallel to the surface of the magneto-optical recording medium, and then held in a cartridge holder. It has a mechanism for engaging the magneto-optical recording medium with the driving means by moving the cartridge holder a predetermined distance in a second direction perpendicular to the surface of the magneto-optical recording medium, and applying a magnetic field to the magneto-optical recording medium. In the magneto-optical recording and reproducing apparatus, the magneto-optical recording and reproducing apparatus is provided with a magnetic field applying means for applying a magnetic field and an optical pickup drive mechanism for reciprocating the optical pickup along a guide rail in a direction transverse to the information track of the magneto-optical recording medium. A surface parallel to the surface of the magneto-optical recording medium is provided between the holder and the guide rail, and light emission from the optical pickup to the magneto-optical recording medium and power transmission for driving the magneto-optical recording medium are provided. 1. A magneto-optical recording/reproducing device characterized in that a plate member having a minimum opening that does not interfere with the arrangement of a mechanism and having a U-shaped cross section is arranged.