JPH0535441Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to the attachment and detachment of magneto-optical recording media.
The present invention relates to a bias magnetic field applying mechanism with a retractable structure.

[Prior Art] In recent years, instead of magnetic pickups, optical information recording devices that can record information at high density by condensing a light beam onto a recording medium, and optical information recording devices that can record information at high density have been developed, instead of magnetic pickups. Optical information reproducing devices that reproduce information data written at high density on a recording medium have been put into practical use.

Among the optical devices mentioned above, magneto-optical information recording and reproducing devices, which can perform both recording and reproducing repeatedly by erasing information, are attracting attention.

In the above magneto-optical device, it is necessary to apply a bias magnetic field to the recording medium in recording and erasing modes, and a bias magnetic field applying device is provided for this purpose.

For a removable recording medium, the bias magnetic field applying device must be evacuated from the recording medium attachment/detachment path during loading and ejection, and must be installed at a position sufficiently close to the recording medium in the loaded state.

For this reason, for example, in the conventional example disclosed in Japanese Patent Application Laid-Open No. 60-25154, a bias magnetic field applying means is provided at the tip of an arm pivoted by a pin, and the arm is rotated to raise and lower the bias magnetic field applying means. It has a structure that allows it to be evacuated.

[Problems to be solved by the invention] In the conventional example described above, the distance between the rotation center and the bias magnetic field application means is long, so a large space is required to rotate and raise and lower the device, resulting in a large device. It had the disadvantage of being stored away.

Furthermore, the disk must be evacuated when the disk is attached or detached, and a mechanism for evacuating the disk in conjunction with attachment or detachment is required.

The present invention has been made in view of the above points, and aims to provide a bias magnetic field application mechanism that does not require a large space and can be evacuated in conjunction with the attachment and detachment of a recording medium using a simple mechanism. purpose.

[Means for Solving the Problems] The present invention is a magneto-optical recording/reproducing apparatus equipped with means for applying a bias magnetic field for recording or erasing, in which a cartridge containing a recording medium is held, loaded, and ejected. The cartridge holder includes a cartridge holder having an aperture formed therein, and a bias magnetic field applying means arranged in the aperture so as to be able to be displaced a predetermined distance with a restoring force in a direction perpendicular to the surface of the recording medium. Hot,
When the cartridge is inserted into the cartridge holder, after the cartridge pushes up the bias magnetic field applying means, the bias magnetic field applying means is pulled back by the restoring force at the opening of the cartridge, and the bias magnetic field applying means It is an object of the present invention to provide a bias magnetic field applying mechanism, characterized in that the recording medium is arranged facing each other with a predetermined gap.

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

1 to 12 relate to a first embodiment of the present invention, FIG. 1 is a perspective view showing a cartridge holder to which the first embodiment is attached, and FIG. 2 is a perspective view of a cartridge holder equipped with the first embodiment. A side view showing the loading mechanism of a magnetic information recording/reproducing device, FIG. 3 is a schematic side view of the information recording/reproducing device, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a retainer during loading. A side view showing the release means, FIG. 6 is a plan view of the base, and FIG. 7 is a side view showing the release means.
The figure is a perspective view showing the base, FIG. 8 is a perspective view showing the disk cartridge, FIG. 9 is a plan view showing the 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.

As shown in FIG. 3, the magneto-optical information recording and reproducing apparatus 1 of the first embodiment has a base 3 fixed in the housing 2 via pillars (not shown) provided at approximately four corners. be. This base 3 has a disk 4 as a disk-shaped recording medium (see Fig. 8).
A cartridge holder 7 having an opening serving as an insertion port 6 for the disk cartridge 5 containing the disk cartridge 5 is attached so as to be movable in the insertion/removal direction C of the disk cartridge 5.

As shown in FIG. 1, the cartridge holder 7 has a substantially square or rectangular upper 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. 7 or 6. Various components can be stored in the space below this 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 at a position near the center in the width direction and slightly closer to the insertion opening 6, through which the rotating shaft 11 of the spindle motor can pass.

The periphery of the upper surface of this through hole 12 is formed into a concave concave shape, so 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 the first embodiment, the space in the housing 2 where the disk 4 (or disk cartridge 5) is stored and the loading motor 18 are connected to the coarse movement mechanism 16 (and the fine movement mechanism by pick-up). The upper surface of the base 3 has a small total opening area (almost only by the opening 14), and the upper surface of the base 3 has a dustproof function. It is designed to have the following. 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 3 passed through between the arms 22, 22
2 is extended and supported to the front and rear positions of both arms 22, 22, so that the shaft 32 and the cartridge holder 7 pass through the holes of the arms 22, 22 during autoloading or ejecting operations. is 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. Further, when the disk 4 is lowered and set to the mounted state, the bias magnetic field applying device 9 is also lowered and is installed at an upper position close to the disk 4 to apply 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 mounted state by the eject operation, the shaft 32 also rises, so the pair of arms 22, 22 rotate around the pivoted shaft 24 as a fulcrum 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 body 36 has a disk 4 in its center 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. 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 2, 3, 5, and 7).

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 2, 3, and 5.
As shown in FIG. 7, 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 the autoloading mechanism of the first embodiment that moves the cartridge holder 7 and guides the disk 4 to a predetermined mounting position, a gear 48 meshing with gears 52, 52 rotationally driven by the rotation of a motor 18; 49 , 48 , 49 , the pins 68 , 69 protruding from each guide piece 55 , 56 of the cartridge holder 7 are inserted into the guide hole 66 of the guide plate 63 .
By moving the cartridge along the lever, force can be transmitted more efficiently than when the cartridge holder is driven by rotating the lever.

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 a gear 48,
The rotation angle of 49 is reliably defined, and the timing of locking, 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.

In the first embodiment, for example, a micro switch is provided near the back end of the insertion opening 6 of the cartridge holder 7 so that when the disk cartridge 5 is inserted to a predetermined position, it can be automatically set to the mounting position. (not shown) is attached, and when the switch lever of this micro switch is pressed and turned on, the motor 18 is operated to guide the disk cartridge 5 together with the cartridge holder 7 toward the mounting position of the disk 4. There is.

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. 1 or FIG. 4, a pair of projecting pieces 71, 71 are provided at one corner of the front end 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,
A shaft collar 73 and shaft collars 74, 74 on both sides of the shaft collar 73 are interposed on the shaft collar 73, 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 collar 73. 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 part 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 part 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.

Therefore, the insertion slot 6 of the disk cartridge 5
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, causing the leaf spring 84 to warp, and the leaf spring 84 to rotate clockwise around the shaft 72 that pivots the retaining piece 75, causing the tip of the leaf spring 84 to warp. 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. 7, protrusions 91, 91 for cartridge positioning are provided at the back of the insertion slot 6 in the base 3 and 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. 1, FIG. 4, FIG. 2, and FIG. 5, square openings 95, 95 are provided at two locations on the left and right sides of the upper surface of the cartridge holder 7 near the insertion opening 6. , 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 in the recording or erasing mode. 1
It is possible to apply the required magnetic field by supplying current to 02i (i = any one of a, b, or c), and by passing it through one divided part, 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, in the first embodiment, when the disk cartridge 5 is attached or detached, there is a means for retracting the bias magnetic field applying means protruding inside the loading path of the disk cartridge 5.
The mounting bracket 104 to which the bias magnetic field applying means is attached is attached to the coil springs 105, 105, 105, 1.
Elevating guide members 107, 107 are provided which are elastically attached to ensure a stroke amount that can be retracted by the disk cartridge 5, and which are 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, there is an elevating mechanism that presses the tip of the disk cartridge 5 and retracts it upward. Guide members 107, 107 are attached with screws or the like. Moreover, this elevating guide member 10
Disk cartridge 5 pushed up by 7,107
is inserted close to the mounting position, and the opening 38 of the disk cartridge 5 is inserted into the lifting guide member 10.
7, 107, the pressure is released and the coil springs 105 are lowered by the urging force. In order to smoothly ascend and descend, the lower front and rear end portions of the elevation guide members 107, 107 have tapered surfaces 107a, 1 cut out in a tapered shape.
07a is formed. Therefore, for example, when the disk cartridge 5 is inserted, the state shown in FIG. 12 is reached in which the tip end contacts the tapered surface 107a. If you insert it further from this state, the tapered surface 1
07a is pressed, and the mounting metal fittings 104 urged 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, it is no longer pressed, and the bias applying means is applied to the opening 38 by the biasing force of each coil spring 105.
a It will return to the state of protruding inward.

In this first embodiment, the disk cartridge 5
An opening 14 is provided on the upper surface of the insertion/removal passage into which the disc cartridge 5 is inserted in the cartridge holder 7, which serves as a guide member for holding and guiding the disc cartridge 5 to the mounting position. , 105, 105, 105 are attached.
Therefore, when the cartridge 7 is attached or removed, the bias magnetic field applying device 9 is reliably retracted by being pushed by the upper surface of the disk cartridge 7. In other words, it has a very simple structure and forms a bias magnetic field applying mechanism that can be retracted in conjunction with attachment and detachment. In addition, since it is installed so that it can be retracted from the opening 14 to the upper side,
The space available for evacuation is sufficiently small, making it suitable for downsizing the device.

13 and 14 show the vicinity of a bias magnetic field applying device 111 in a second embodiment of the present invention.

In this bias magnetic field applying device 111, a roller support member 112 is used in which the elevation guide member 107 in the first embodiment is not provided with the tapered surface 107a, and a roller 113,
113 is attached rotatably. That is, a through hole is provided in the roller support member 112 so that the rotatable shaft 11
4 through the shaft 114 that protrudes on both sides of this through hole.
Install the pair of rollers 113, 113, and tighten the nut 11.
5,115 prevents it from coming off.

When the disk cartridge 5 is attached or detached, the rollers 113, 113 are rotated at the upper corner of the disk cartridge 5 and raised together with the bias magnetic field applying device 111 to be retracted.

The rest of the structure is the same as that of the first embodiment.

According to the second embodiment, since the portion pressed by the disk cartridge 5 can rotate when the disk cartridge 5 is attached or detached, the force of collision with the disk cartridge 5 can be reduced. Therefore, even if the disk cartridge 5 is repeatedly attached and detached,
This prevents scratches from occurring and allows for smooth evacuation.

FIG. 15 shows the peripheral portion of a bias magnetic field applying device in a third embodiment of the present invention.

In the bias magnetic field applying device 121 in this third embodiment, electromagnets 123, 12 are connected to portions adjacent to the T-shaped yokes 99, 99 at both longitudinal ends of the opening 8a via support members 122, 122, etc.
3 is installed. Therefore, when attaching and detaching, a current is passed through both electromagnets 123, 123, and the coils 10 of the yokes 99, 99 adjacent to these electromagnets 123, 123 are supplied with current.
1 and 101, the electromagnets 123 and 123 on the upper side fixed to the cartridge holder 7 are attracted by magnetic force, and the cartridges are retracted upward. As shown in FIG. 15, for example, an electromagnet 123
When the end on the yoke 99 side is magnetized to the S pole, the yoke 99 side is magnetized to the N pole, and a current is passed so that mutual attraction acts. The timing for flowing this current may be set to coincide with the operation of the motor 18 during autoloading and ejection. Further, when a disk cartridge is attached or detached, a micro switch may be turned on and off to control the period during which current is passed through the micro switch.

In the present invention, the bias magnetic field applying means is attached so as to be retractable, but it can also be applied to the disk clamping means.

[Effects of the invention] As described above, according to the invention, the disk cartridge is installed in the opening of the cartridge holder in a biased state so as to protrude into the insertion/removal path of the disk cartridge, and the disk cartridge is attached/removed. Since the bias magnetic field applying means is attached so that it can be pushed up or retracted at any time, a bias magnetic field applying mechanism equipped with a retracting mechanism can be formed with a simple configuration without requiring a large space.

[Brief explanation of the drawing]

1 to 12 relate to a first embodiment of the present invention, FIG. 1 is a perspective view showing a cartridge holder in which a bias magnetic field applying mechanism of the first embodiment is formed, and FIG. 2 is a perspective view of a cartridge holder according to the first embodiment. FIG. 3 is a schematic side view of the information recording and reproducing apparatus;
FIG. 4 is a plan view of FIG. 3, FIG. 5 is a side view showing a means for releasing the retainer during loading, FIG. 6 is a plan view of the base, and FIG. 7 is a perspective view of the base.
FIG. 8 is a perspective view showing the disk cartridge, FIG. 9 is a plan view showing the bias magnetic field applying means, and FIG.
Figure 0 is a cross-sectional view taken along the line A-A' in Figure 9, Figure 11 is a cross-sectional view taken along the line B-B' in Figure 9, and Figure 12 shows the bias application means being raised and retracted when the disk cartridge is inserted. FIG. 13 is a plan view showing the second embodiment of the present invention, FIG. 14 is a sectional view taken along the line C-C' in FIG. 13, and FIG. 15 is a plan view showing the third embodiment of the present invention. FIG. 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 magneto-optical recording and reproducing device equipped with means for applying a bias magnetic field for recording or erasing, which holds, loads and ejects a cartridge containing a recording medium, and which has an opening formed therein. The cartridge holder is provided with a bias magnetic field applying means disposed in the opening so that the cartridge can be displaced a predetermined distance with a restoring force in a direction perpendicular to the surface of the recording medium. After the cartridge pushes up the bias magnetic field applying means when inserted into the cartridge holder, the bias magnetic field applying means is pulled back by the restoring force at the opening of the cartridge, and the bias magnetic field applying means and the recording medium are pulled back. A bias magnetic field applying mechanism characterized in that the two are arranged facing each other with a predetermined gap therebetween.