JPH1055578A - Discoid recording medium loading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To combine a discoid recording medium with a motor by moving a magnetic field generating means in simple constitution in a device for recording information with the magnetic field generating means disposed in close proximity to a medium surface of the discoid recording medium. SOLUTION: A fitting plate 113 is turnably disposed via a screw 119 on an arm 105 to be turned around an axis 104 as the center, and moreover, the magnetic field generating means is made to be moved toward the discoid recording medium by a moving mechanism of the fitting plate 113 arranged with a coil, and the discoid recording medium is combined with the motor based on attracting force worked between a permanent magnet 34 coupled with a motor drive shaft 14a and a magnetic member 33 combined with the discoid recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records magnetic information on a disk-shaped recording medium by disposing magnetic field generating means for recording information on a disk-shaped recording medium housed in a cartridge. It relates to improvement of the device.

[0002]

2. Description of the Related Art An apparatus for recording information on a disk-shaped recording medium in which a magnetic field generating means for recording information is arranged close to the medium surface of the disk-shaped recording medium and which is used widely.

Japanese Patent Laying-Open No. 59-207070 discloses a configuration in which a coil of a magnetic head 20 as a magnetic field generating means is arranged close to a magnetic disk 13 as a disk-shaped recording medium. However, in the configuration disclosed in the publication, the coil of the magnetic head 20 is fixedly arranged at a position at a fixed distance from the medium surface of the magnetic disk 13. In such a configuration, when using a cartridge containing a disk-shaped recording medium, the magnetic head 2
0 hits the cartridge, which has the disadvantage of damaging the magnetic head. An apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 61-123051 solves such a disadvantage. FIG. 1 shows a plate member 16 on which a winding coil 25 or the like as a magnetic field generating means is fixed after a disk cartridge 15 is inserted into a guide member 17 as a cartridge holder.
Is lowered so that the winding coil 25 moves toward the medium surface of the disk 23. However, the configuration shown in FIG. 1 of JP-A-61-123051 is different from that of the roller pins 28 and 29 fixed to the plate member 16.
Are engaged with vertically long holes 30, 31 formed in the fixing member and cams 32, 3 formed in the guide member 17.
3. Therefore, such a configuration has a disadvantage that the moving mechanism of the magnetic field generating means is complicated.

Further, Japanese Patent Laid-Open No. Sho 61-123051 No. 6
8 to 8 also disclose a moving mechanism for moving the coil 25 as the magnetic field generating means toward the medium surface of the disk-shaped recording medium. The moving mechanism disclosed in FIG. 6 of this publication is a diagram viewed in a direction parallel to the medium surface. 6, the operating lever 52 is connected to the base at the position of the support pin 54, and the support pin 55 is connected to the support pin 54.
Are configured to be displaced around. Further, the plate member 16 is connected to the operating lever 52 via a support pin 55, and the coil 25 and the like as magnetic field generating means are fixed to the plate member 16. The plate member 16 is the plate member 1
The roller pins 28 and 29 fixed to 6 are configured to move in the vertical direction along vertical slots 30 and 31 formed in the base.

However, Japanese Patent Application Laid-Open No. 61-123051 discloses
6 to 8, the support pin 55 disposed at one end of the operation lever 52 is displaced in an arc around the support pin 54, whereas the plate member 16 is , 29 and the vertically long grooves 30, 31, only linear movement in the vertical direction is possible. Therefore, the configuration disclosed in FIGS. 6 to 8 of JP-A-61-123051 has a disadvantage that the coil 25 cannot be accurately arranged close to the medium surface. This does not provide a reliable device.

FIG. 1 of Japanese Patent Application Laid-Open No. Sho 62-157364 is a view as viewed in a direction parallel to the medium surface, wherein an arm 23 which is a movable body is a cartridge holder 7 and a base plate 19 which is a base. The tip of the arm 23 (the tip to which the field coil 11 is coupled) is
(The displacement in the case of this publication is a displacement due to rotation). Here, the field coil 11 serving as a magnetic field generating means is coupled to the end of the arm 23 via two springs 107a and 107b.

[0007]

However, the field coil 11 disclosed in this publication is not
There is a disadvantage that the moving mechanism of the magnetic field generating means is large and complicated because it is supported by 07a and 107b. Further, the shutter 3 disposed in the cartridge 5 disclosed in the publication is disclosed.
Since the shutters 9a and 39b are arranged inside the cartridge 5, there is a disadvantage that such a shutter mechanism is also complicated.

As a solution to such a disadvantage, Japanese Utility Model Laid-Open No.
There is a configuration disclosed in Japanese Patent Application Laid-Open No. 4-42525. Actual opening 64-4
FIG. 4 of No. 2525 discloses a configuration diagram viewed in a direction parallel to the medium surface of the recording medium. FIG. 4 shows the movable base 14, the support body 38, and the first spring 30.
And a shaft piece 18 corresponding to a first position and an engagement notch 27 corresponding to a second position. Here, the engagement notch 27 is displaced around the shaft piece 18, and the height regulating portion 49 corresponding to the end of the movable body is configured to be displaceable around the engagement notch 27. Further, the combined body of the rotating base 14, the support body 38, and the first spring 30, which are movable bodies, is composed of the base frame 1, the beam 2,
The bracket 3 is movably supported by the bracket 3.

However, in the configuration disclosed in FIG. 4 of Japanese Utility Model Application Laid-Open No. 64-42525, there is no explanation on how to connect the disk-shaped recording medium to the motor drive shaft. An object of the present invention is to provide a mounting device for a disk-shaped recording medium which solves the above-mentioned disadvantages.

[0010]

According to the moving device of the magnetic field generating means of the present invention, after a cartridge containing a disk-shaped recording medium is inserted into a cartridge holder, the cartridge holder is moved in a direction in which a motor is arranged. The disk-shaped recording medium is coupled to the motor by moving the disk-shaped recording medium (when the disk-shaped recording medium rotates when the motor is driven to rotate, this is included in the “coupling”). A disk-shaped magnetic field generating means (which generates magnetic flux) for recording information on a recording medium is moved toward the medium surface so that the magnetic field generating means is arranged close to the medium surface. In the recording medium mounting apparatus, the coupling of the disc-shaped recording medium to the motor is coupled to a motor drive shaft of the motor. Based on an attractive force acting between a permanent magnet and a magnetic member coupled to the disk-shaped recording medium, when the moving mechanism is viewed in a first direction parallel to the medium surface, The moving mechanism is the first
(A portion extending along a second direction substantially parallel to the medium surface at right angles to the direction of the medium) ("a portion extending along a second direction substantially parallel to the medium direction") is roughly oriented in the second direction. The "movable body" to be described later displaces in position, but it is sufficient if one of the forms is applicable), and the movable body includes a first movable body that is spaced apart from the first movable body. And a second position, and the cartridge holder and the base (members fixed to the base so as not to move with respect to the base are included in the "base" of the present invention).
It is supported so that it can be moved by at least one of
The second position is configured to be displaceable about the first position when viewed in the first direction and the movable position is opposite to the first position with respect to the second position; The tip of the body is configured to be displaceable around the second position, and the magnetic field generating means is configured to be at least coupled to the movable body between the tip and the second position. It is characterized by the following.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 10 relate to an embodiment of the present invention, FIG. 1 is a sectional view showing a cartridge holder, FIG. 2 is a plan view of an information recording / reproducing apparatus, and FIG.
Is a bottom view of the information recording / reproducing apparatus, FIG. 4 is a side view showing the cartridge holder, FIG. 5 is a perspective view of the information recording / reproducing apparatus, FIG. 6 is a side view showing the auto-loading mechanism, and FIG.
9 (b) is a side view for explaining the operation of the auto loading mechanism, FIG. 8 is an exploded perspective view of the magnetic field applying device, FIG.
(A) to (d) are side views for explaining the operation of the magnetic field applying device, and FIG. 10 is a plan view of the disk cartridge.

As shown in FIG. 2, a magneto-optical information recording / reproducing apparatus 1 to which the present embodiment is applied has a base 3 housed and fixed in a housing 2. The base 3
On the top, a cartridge holder 7 provided with an opening serving as an insertion port 6 of a disk cartridge (hereinafter, referred to as a cartridge) 5 containing a disk-shaped recording medium (hereinafter, referred to as a disk) 4 as a magneto-optical recording medium. Are mounted so as to be movable in the insertion direction of the cartridge 5. Incidentally, the cartridge holder 7 is moved by an auto-loading mechanism to be described later, so that the cartridge 5 is mounted (loaded) and unloaded (unloaded).

The upper surface of the cartridge holder 7 is formed by a substantially square or rectangular plate-like upper plate 7a, and side plates 61a and 61b are attached to both sides of the upper plate 7a. Each of the side plates 61a and 61b has a portion bent inward, and the cartridge 5 can be inserted between the bent portion and the upper plate 7a. The upper plate 7a of the cartridge holder 7 is provided with a substantially rectangular opening 8 whose insertion direction is the longitudinal direction at substantially the center, and the bias magnetic field applying device 10 is vertically movable so as to face this opening 8 from above. Mounted on Further, a shutter opening / closing device 11 for the cartridge 5 is provided at a deep portion in the insertion direction in the cartridge holder 7. Further, leaf springs 9, 9 for pressing the upper surface of the cartridge 5 are attached to both sides of the upper plate 7a.

As shown in FIG. 3, a substantially rectangular opening 12 is formed in the upper surface of the base 3 from the center slightly toward the insertion opening 6 to the back in the insertion direction. On the lower side, a spindle motor 14 is provided. As shown in FIG. 1, a turntable 15 is attached to a drive shaft 14 a of the spindle motor 14, and the drive shaft 14 a and the turntable 15 slightly protrude above the base 3 through the opening 12. The disc 4 in the cartridge 5 loaded and held by the cartridge holder 7 is mounted on the turntable 15 and is rotated by a spindle motor 14.

As shown in FIG. 3, an optical pickup 2 is located at the back of the spindle motor 14 in the insertion direction.
0 is disposed movably along the longitudinal direction of the opening 12.

A motor 16 as a driving source for auto-loading and a board 17 constituting an electronic circuit are mounted on the lower side of the base 3 at a position substantially below the insertion opening 6 of the cartridge holder 7. Have been.

The cartridge 5 accommodating the disk 4 is constructed, for example, as shown in FIG. That is, the cartridge 5 has a flat rectangular parallelepiped shape and includes a hollow cartridge main body 21.
5 is formed, and a rectangular opening 23 for recording, reproduction, and erasing is formed from the opening 22 to the back side in the insertion direction. The opening 22, 2
On the outside of the shutter 3, there is provided a shutter 25 folded in a U-shape so as to cover the upper and lower openings 22 and 23. Each end of the shutter 25, which is folded in a U-shape, is engaged inside a guide plate 26 provided on the upper and lower surfaces of the cartridge main body 21, and extends along the guide plate 26 in a direction orthogonal to the insertion direction. It is movable. The shutter 25
One end of a spring 27 housed in the cartridge 5 is fixed to an end portion on the back side in the insertion direction, and the other end of the spring 27 is fixed to a corner of the cartridge body 21. The spring 27 urges the shutter 25 in a direction to cover the openings 22 and 23. A small opening 2 is provided on the end face of the shutter 25 on the back side in the insertion direction.
8 are provided.

The end of the cartridge body 21 on the far side in the insertion direction is notched in a tapered shape so that the width of both side ends is slightly reduced, so that the cartridge body 21 can be easily inserted into the insertion opening 6. Grooves 29a and 29b are formed in the center in the thickness direction in the vicinity of the tapered cutout.
a, 29b, arc-shaped concave portions 30a, 30
b is formed.

Further, as shown in FIG.
A disk-shaped center member 31 thicker than the disk 4 is attached to the center of the disk. This center member 31
The drive shaft 14a of the spindle motor 14 is inserted into a hole 32 at the center of the upper and lower surfaces. Also, a magnetic material 33,
33 are applied. Meanwhile, the turntable 15
A permanent magnet 34 at a position facing the magnetic material 33.
Has been fixed. The disk 4 is clamped by the attraction between the magnet 34 and the magnetic material 33.

The shutter 25 of the cartridge 5
The shutter opening and closing device 11 that opens and closes the shutter is configured as follows. That is, as shown in FIG. 2, pins 36a and 36b
There are provided two arms 37a, 37b that can rotate about. At one end of each of the arms 37a and 37b, a pin 38 that engages with the opening 28 of the shutter 25 is attached. In FIG. 2, only the pin 38 on one arm 37b side is shown. The arms 37a and 37b are vertically displaced so as not to collide with each other, and the pins 38 are also mounted vertically on the arms 37a and 37b, respectively. Further, pins 40a and 40b are protruded from the upper surfaces of the substantially central portions of the arms 37a and 37b, respectively. On the other hand, the upper plate 7a of the cartridge holder 7 has an arc-shaped guide hole 41 into which the pins 40a and 40b are engaged.
a, 41b are formed. And this guide hole 41
The rotation range of the arms 37a and 37b is regulated by the a and 41b. Further, the arms 37a, 37
One ends of springs 42a and 42b are fixed to the other end of b, respectively. The other ends of the springs 42a and 42b are
It is fixed to the cartridge holder 7. Then, the arms 37 are formed by the springs 42a and 42b.
a and 37b are urged so that the end of the handle of the pin 38 rotates toward the insertion opening 6 side.

In the shutter opening / closing device 11 having such a configuration, when the cartridge 5 is inserted into the cartridge holder 7, first, one of the pins 38 is engaged with the opening 28 of the shutter 25. When the cartridge 5 is further inserted, the arm 37 is pushed by the cartridge 5.
a, 37b rotate to the back side. Along with this, the pin 38 engaged in the opening 28 moves the shutter 25 in the opening direction. When the cartridge 5 is inserted into the cartridge holder 7 with the cartridge 5 on the back side in the above-described case, the other pin 38 is engaged with the opening 28, and the shutter 25 is opened as in the above-described case.

In this embodiment, a lock mechanism for a cartridge having the following structure is provided. That is, lock levers 45a and 45b are provided which are rotatable around the pins 36a and 36b. At the ends of the lock levers 45a and 45b, convex portions 46a which engage with the concave portions 30a and 30b of the cartridge 5 are provided. , 4
6b are formed. The projections 46a and 46b are formed on the insertion opening 6 side in a tapered shape so as to be easily engaged with the recesses 30a and 30b. A spring 47 is provided substantially at the center of each of the lock levers 45a and 45b.
a and 47b are fixed at one end. This spring 47a,
The other end of 47b is fixed to the cartridge holder 7. And, by these springs 47a and 47b,
The lock levers 45a, 45b are
46b is urged so as to rotate in a direction engaging with the concave portions 30a, 30b. Also, on both sides of the base 3,
Lock plates 48a and 48b are attached. The lock plates 48a and 48b are used to lock the lock lever 45 when the cartridge holder 7 is closer to the mounting side than a predetermined position.
a, 45b, abutting against the side of the lock lever 45a,
The rotation of 45b is regulated.

In the cartridge locking mechanism having such a configuration, when the cartridge 5 is inserted into the cartridge holder 7, the convex portions 46 of the lock levers 45a and 45b are formed.
a, 46b engage with the recesses 30a, 30b of the cartridge 5. The lock levers 45a and 45b are
a, because it is biased in the direction of engaging with 30b,
The cartridge 5 is held by the cartridge holder 7 with a predetermined force. Further, when the cartridge holder 7 moves to the mounting side by loading, the lock plate 48
The cartridges 5 are securely fixed to the cartridge holder 7 because the a and b contact the side portions of the lock levers 45a and 45b to restrict the rotation of the lock levers 45a and 45b. Conversely, when unloading,
First, the lock lever 45 by the lock plates 48a and 48b is used.
The rotation of the lock levers 45a and 45b is released, but since the lock levers 45a and 45b are urged in the direction of engaging with the recesses 30a and 30b, the cartridge 5 It is kept with the ability of. Therefore, when unloading, the cartridge 5
Never jump out.

The optical pickup 20 is configured as shown in FIG. That is, the optical pickup 20 includes a pickup main body 52 provided on a carriage 50 having a hole through which the two rails 51, 51 are inserted. The rails 51, 51 inserted into the carriage 50 are erected along the insertion direction of the disk 4. The carriage 50 is provided with, for example, three guide rollers 60 that roll in contact with the rails 51, 51. The pickup main body 52 is movable in the radial direction of the disk 4 along the rails 51, 51. On both sides of the pickup main body 52, bobbins 53, 53 are detachably attached with, for example, four screws 56.
A coil 54 is wound around the outer periphery of the bobbin 53, and an inner yoke 55 is inserted into the bobbin 53. An outer yoke 5 is provided above and below the bobbin 53, respectively.
A magnet (not shown) is fixed to an end face of each outer yoke 57 on the side facing the bobbin 53. The magnet is connected to the coil 5
4 with a predetermined interval. The inner yoke 55 and the upper and lower outer yokes 57 are integrated by a yoke support (not shown), and the integrated three yokes are fixed to the base 3 by screws 59.
Then, by passing a current through the coil 54, the pickup main body 52 can be moved by a torque generated by the magnetic field generated by the magnet and the current of the coil 54.

The pickup main body 52 has an actuator (not shown) mounted on the upper surface of the carriage 50.
The objective lens is held movably in the radial direction and the optical axis direction. The objective lens faces the disk 4 via the opening 12 of the base 3 and the opening 23 of the cartridge 5. The pickup body 52 includes a laser diode (not shown), and light emitted from the laser diode
The light is emitted from the objective lens to the disk 4 through an optical system provided in the optical disk 2.

The automatic loading mechanism for loading the disk 4 is constructed as follows.
That is, as shown in FIG. 6, guide plates 62, 62 are attached to both side surfaces of the base 3. The guide plates 62, 62 are formed integrally with the lock plates 48a, 48b. On both sides of the base 3, two gear shafts 64a, 64b are attached along one side along the insertion direction. The gear shafts 64a, 6
4b penetrates each guide plate 62 and protrudes outward. Main gears 65a and 65b having a large diameter are rotatably attached to the gear shafts 64a and 64b. In addition, near the lower center of the two main gears 65a and 65b,
A drive gear 66 having a small diameter is provided.
Are engaged with both main gears 65a and 65b. As shown in FIG. 3, the drive gears 66 on both sides are connected by a gear shaft 67. A worm wheel 69 is mounted on the gear shaft 67. A worm (not shown) attached to the drive shaft of the loading motor 16 meshes with the worm wheel 69. Note that bearings 70 are provided at both ends of the gear shaft 67. The bearings 70 are inserted into bearings 71 provided on the base 3 and then attached to the bearings 71 with screws. It is pressed and fixed by a bearing stopper 72 in a shape of a circle.
The main gears 65a and 65b rotate via the drive gear 66 by rotating the motor 16 in this manner.

The main gears 65a and 65b are
A substantially 90-degree fan-shaped area of the circle is cut out, and the main gears 65a and 65b are respectively provided with substantially 90-degree fan-shaped auxiliary gears 75a and 75b, respectively. It is attached so that it may be concentrically overlapped by about 3/4. This auxiliary gear 75 (75a, 75b
To represent. 2), two long holes 76 are formed along the circumferential direction. The main gear 6 is provided in each slot 76.
5 (representing 65a and 65b)
7 are engaged. And the pin 77 is elongated
, The auxiliary gear 75 can move in the circumferential direction with respect to the main gear 65 within a predetermined range defined by the elongated hole 76. A spring 78 is provided between the main gear 65 and the auxiliary gear 75, and the spring 78 urges the auxiliary gear 75 in a direction in which a portion overlapping the main gear 65 is reduced. A gear groove is formed in substantially the entire outer peripheral portion of the auxiliary gear 75. However, in the outer peripheral portion of the main gear 65, portions where the gear groove is not formed are formed at both ends in the circumferential direction. Have been. In a state where the main gear 65 and the auxiliary gear 75 have the least overlapping portion, a part of the gear groove of the main gear 65 and a part of the gear groove of the auxiliary gear 75 overlap. Further, the driving gear 66 includes a main gear 65.
And the auxiliary gear 75 are formed in a width that can be engaged with both.

In the vicinity of both ends in the circumferential direction of the main gear 65, elongated holes 80, 80 having a longitudinal direction in the radial direction are formed. The guide plate 62 has two guide holes 81, 81 formed in front and rear in the horizontal direction.
Each guide hole 81 is formed by a horizontal hole 82 extending linearly in the horizontal direction and an end of the horizontal hole 82 on the back side in the insertion direction.
And a vertical hole 83 extending vertically downward.
Further, the side plates 61 (61a, 61a) of the cartridge holder 7 are provided.
b. ), Two legs 84a and 84b extend downward before and after in the horizontal direction. This leg 84
Pins 85a and 85b are respectively provided on a and 84b so as to protrude outward. These pins 85a, 85b
Are guide holes 81 of the guide plate 62,
The main gear 65 is engaged with the elongated hole 80.

The operation of the auto loading mechanism having such a configuration is as follows. When the cartridge 5 is inserted into the cartridge holder 7, the motor 16 for auto loading is rotated, and the drive gear 66 is rotated, the main gears 65a and 65b are rotated. Then, the pins 85a, 85b provided on the legs 84a, 84b of the side plate 61 are pressed by the side walls of the long holes 80, 80 of the main gears 65a, 65b, and move along the guide holes 81 of the guide plate 62. I do. First, the pins 85a, 85b are inserted into the guide holes 81,
The cartridge holder 7 moves from the state shown in FIG. 7A to the state shown in FIG.
Move horizontally to the state shown in FIG. When the main gears 65a and 65b further rotate from the state of FIG.
Since the pins 85a and 85b move along the vertical holes 83 and 83 of the guide holes 81 and 81, the cartridge holder 7 moves from the state of FIG. 7B to the state of FIG.
Descent vertically. As described above, when the cartridge holder 7 descends, the disk 4 stored in the cartridge 5 held by the cartridge holder 7 is moved.
Is mounted and fixed on the turntable 15.

In the present embodiment, the main gears 65a, 65a are used until the cartridge holder 7 reaches the end of loading, that is, immediately before reaching the most lowered position.
The drive gear 66 meshed with only the main gear 65a, b
After the gear 65b and the auxiliary gears 75a and 75b are engaged, only the auxiliary gears 75a and 75b are engaged. Immediately before the cartridge holder 7 reaches the end of loading, the main gears 65a and 65b are driven via the elastically connected auxiliary gears 75a and 75b, and the cartridge holder 7 moves. Further, after reaching the end of loading, only the auxiliary gears 75a and 75b are slightly rotated by the drive gear 66 against the biasing force of the springs 78 and 78. For example, a magnet (not shown) is attached to one main gear, and the starting point and the ending point of the loading are two magnetic sensors such as a Hall element (not shown) arranged at two positions facing the magnet at the starting point and the ending point of the loading. Is detected by When the magnetic sensor detects that the end position has been reached, the loading motor 16 is stopped.

In this embodiment, for example, three reference surfaces (not shown) are provided on the upper surface of the base 3, and the side plates 61a and 61b of the cartridge holder 7 are bent inward, and An abutting portion (not shown) that abuts is formed. When the loading is finished, the cartridge holder 7 is positioned with respect to the base 3 by the contact between the reference surface and the contact portion.

During unloading, the motor 16
Is rotated in the reverse direction, and performs an operation opposite to the above-described loading operation. As described above, in the auto-loading mechanism according to the present embodiment, after the loading end point is reached, only the auxiliary gears 75a and 75b are driven by the drive gear 66.
It is rotated against the biasing force of the springs 78, 78. Therefore,
Biting of the gear which occurs when a rotational force is applied after the gear has stopped is prevented, and an excessive load is not applied to the motor 16 during unloading. The spring 7
Since the cartridge holder 7 is pressed onto the base 3 by the urging forces of 8, 78, the mounting state of the cartridge 5 is stabilized.

Incidentally, the bias magnetic field applying device 10 provided with the moving device of the present embodiment is configured as follows. That is, as shown in FIG. 2, a support base 101 is attached to the upper plate 7 a of the cartridge holder 7 at a position on the back side in the insertion direction of the opening 8 by, for example, screws.
As shown in FIG. 8, the support base 101 is made of a plate-like member,
2, 102 are formed. The bearing portions 102, 102
Are formed with holes 103, 103, respectively.
Through the shafts 03 and 103, a shaft 104 is rotatably mounted. An arm 105 is attached to the shaft 104, and the arm 105 is rotatable about the shaft 104. The arm 105 has two elongated plate-shaped main arms 106a and 106b whose one end side (the center side of the disk 4) is disposed in the opening 8, and one end of the main arm sections 106a and 106b. In
Elongated holes 107, 107 extending substantially in the vertical direction, respectively, are provided. The other ends of the main arms 106a and 106b are connected to each other by a plate-shaped substrate mounting portion 108. Further, the main arm 106 (106a, 106)
b. A hole 109 through which the shaft 104 is inserted is formed between the two ends of ()) and near the other end. An elongated plate-like lever portion 110 extends from the board mounting portion 108 to the back side in the insertion direction. The main arms 106a and 106b are connected to the shaft 1
Rotating around the center 04, one end side approaches and separates from the disk 4 through the opening 8. It is to be noted that one of the rotation ranges of the main arms 106a and 106b is regulated by the bottom sides of the other ends of the main arms 106a and 106b abutting on the upper surface of the upper plate 7a.

The main arms 106a, 106b
A magnetic field applying member 112 is rotatably mounted between them. The magnetic field applying member 112 has a mounting plate 113, and the coil 11 is provided substantially at the center of the bottom surface of the mounting plate 113.
The plate-like yoke 116 holding the fifth yoke 5 is attached.
On both sides of the coil 115 and the yoke 116, yokes 117, 117 each having a rectangular parallelepiped shape are provided.
Reference numerals 17 and 117 are attached to the bottom surface of the attachment plate 113 by, for example, screws. A screw hole 118 is provided substantially at the center of each of the outer surfaces of the yokes 117, 117, and a screw 119 is screwed into the screw hole 118. The screws 119 are respectively connected to the main arms 106a,
106b is engaged with each of the long holes 107, 107. Accordingly, the magnetic field applying member 112 is rotatable about the screws 119 and 119 with respect to the arm 105 and is movable in the length direction of the long hole 107.

The long hole 1 of one main arm 106b
A spring 121 is provided between the end on the 07 side and the mounting plate 113.
Has been erected. And by this spring 121,
The magnetic field applying member 112 is urged in such a direction that the end on the center side of the disk 4 comes closer to the disk 4. The one main arm portion 106b is provided with a stopper portion 122 which is bent inward at a position slightly closer to the long hole 107 than the hole 109. This stopper portion 122
As shown in FIG. 9A, the magnetic field applying member 1 contacts the upper surface of the end of the mounting plate 113 on the outer peripheral side of the disk 4.
Twelve springs 121 regulate the range of rotation in the biasing direction.

The conductor 1 connected to the coil 115
Reference numerals 23 and 123 denote board mounting portions 108 of the arm 105.
It is connected to a connector 125 via a substrate 124 mounted on the upper side with, for example, screws.

Further, as shown in FIG.
5, between the end of the lever portion 110 and the upper surface of the base 3.
A spring 127 is provided. And this spring 127
Accordingly, the arm 105 is urged in a direction in which the one end side to which the magnetic field applying member 112 is attached is rotated so as to be separated from the disk 4. A stopper 128 is attached to the upper plate 7 a of the cartridge holder 7 so as to contact the upper surface of the mounting plate 113 of the magnetic field applying member 112. The stopper 128 abuts on the upper surface of the mounting plate 113 to regulate the range of rotation of the arm 105 and the magnetic field applying member 112 in the biasing direction by the spring 127.

As shown in FIGS. 1 and 9A, the magnetic field applying member 112 is substantially parallel to the disk 4 when the magnetic field applying member 112 is farthest from the disk 4 by the stopper portions 122 and 128. It is to be maintained in a state.

As shown in FIG. 1, a drive plate 130 for rotating the lever portion 110 in conjunction with the loading operation projects upward from the upper surface of the end of the base 3 on the far side in the insertion direction. Has been established. The driving plate 130 comes into contact with the lower surface of the end of the lever portion 110 in the process of lowering the cartridge holder 7 during loading, and pushes up the lever portion 110 as the cartridge holder 7 lowers. When the lever 110 is pushed up, the arm 1 is
05 rotates, and the magnetic field applying member 112 approaches the disk 4. When the loading is completed, the magnetic field applying member 112 comes closest to the disk 4 and faces the disk 4 at a predetermined interval.

As shown in FIG. 2, the mounting plate 113 of the magnetic field applying member 112 has, for example, three flange portions 1.
On the other hand, on the upper surface of the upper plate 7a of the cartridge holder 7, there is formed a reference surface 132 projecting slightly upward and abutting on each of the flange portions 131 at the end of loading. Then, the magnetic field applying member 112 is positioned at a predetermined position with respect to the disk 4 by the contact between each flange portion 131 and the reference surface 132.

Next, the operation of the bias magnetic field applying device 10 will be described with reference to FIG. First, before inserting the cartridge 5 into the cartridge holder 7, FIG.
As shown in (a), the lever portion 110 of the arm 105 is separated from the drive plate 130, and since the arm 105 is urged by the spring 127, the magnetic field applying member 112 is in the highest state. I have. In this state, the magnetic field applying member 112 is
By means of 128, the upper plate 7a, the upper surface of the base 3 and the disk 4 to be mounted are maintained in a substantially parallel state.
In this state, the position of the bottom surface of the magnetic field applying member 112 is substantially the same as or slightly above the lower surface of the upper plate 7a of the cartridge holder 7, and when the cartridge 5 is inserted into the cartridge holder 7, 112 is out of the way. By arranging the magnetic field applying members 112 in such a parallel state, the upward projecting amount of the magnetic field applying members 112 is minimized.

Next, when the cartridge 5 is inserted into the cartridge holder 7 and loading is started, the cartridge holder 7 first moves in the horizontal direction. During this horizontal movement, the magnetic field application device 10 remains in the state shown in FIG.

Next, when the cartridge holder 7 is lowered vertically, as shown in FIG.
Contacts the lower surface of the end of the lever 110 and pushes up the lever 110 as the cartridge holder 7 descends. When the lever portion 110 is pushed up, the arm 105 rotates about the shaft 104, and the magnetic field applying member 112 approaches the disk 4. Then, as shown in FIG. 9B, first, the magnetic field applying member 11
The tip of the second mounting plate 113 contacts the reference surface 132 formed on the upper surface of the upper plate 7a of the cartridge holder 7. When the cartridge holder 7 further descends from this state, the arm 105 further rotates, and the magnetic field applying member 112 is moved against the arm 105 against the urging force of the spring 121 as shown in FIG. Before the loading, the magnetic field applying member 112 is turned down to the most lowered state. That is, each flange portion 131 of the mounting plate 113
Abuts on the reference surface 132 and the magnetic field applying member 112
Are opposed to the disk 4 at a predetermined interval in a state parallel to the disk 4.

Next, until the loading is completed, the cartridge holder 7 is further lowered slightly. In this process,
The arm 105 further rotates, but the magnetic field applying member 112 cannot descend. Therefore, as shown in FIG. 9D, the arm 105 moves with respect to the magnetic field applying member 112 along the elongated hole 107 against the urging force of the spring 121. When loading is completed in this way,
The mounting plate 113 of the magnetic field applying member 112 is
21, the upper plate 7 of the cartridge holder 7
a. Therefore, the position of the magnetic field applying member 112 with respect to the disk 4 is reliably maintained. still,
This magnetic field applying member 112 sandwiches the disk 4,
It is arranged at a position facing the optical pickup 20.

At the time of unloading, an operation reverse to the above operation is performed. During recording and erasing of information, current is supplied to the coil 115 of the magnetic field applying member 112, and a bias magnetic field is generated. At the time of recording information, for example, a bias magnetic field having a direction opposite to the magnetization direction of the recording layer of the disk 4 is generated. In this state, a light beam is irradiated by the optical pickup 20 onto a part of the recording layer of the disk 4. . The part irradiated with the light beam in this way is heated above the Curie point, loses magnetization,
When the light beam irradiation is stopped, the magnetization appears again,
At this time, the magnetization becomes parallel to the direction of the bias magnetic field. In this manner, the magnetization direction is reversed depending on the presence or absence of the light beam irradiation, and digital information can be recorded based on the difference in the magnetization direction. On the other hand, at the time of erasing, a bias magnetic field is applied in the same manner as at the time of recording, and a light beam is applied to a portion to be erased, so that the magnetization of the recording layer of the disk 4 is aligned in the magnetization direction parallel to the direction of the bias magnetic field.

As described above, in the magnetic field applying apparatus 10 according to the present embodiment, when the magnetic field applying member 112 is in the highest position, the magnetic field applying member 112
And the position of the bottom surface is substantially the same as or slightly above the lower surface of the upper plate 7a of the cartridge holder 7. Accordingly, the amount of upward protrusion of the magnetic field applying member 112 is small and the moving range is small, so that the information recording / reproducing apparatus 1 can be downsized.

At the end of loading, the cartridge holder 7 is attached to the base 3 on which the disc 4 is mounted.
Is positioned, and the magnetic field applying member 112 is positioned with respect to the cartridge holder 7, so that the magnetic field applying member 112 is accurately positioned with respect to the disk 4. Further, since the magnetic field applying member 112 is pressed against the cartridge holder 7 by the spring 121, the position of the magnetic field applying member 112 with respect to the disk 4 is reliably maintained.

The present invention is not limited to the above embodiment. For example, the arm to which the magnetic field applying member is connected may be attached to the base 3 instead of the cartridge holder 7.

The present invention is not limited to an apparatus having an auto-loading mechanism, but can be applied to an apparatus which is manually loaded.

[0050]

According to the magnetic field moving device of the present invention, after a cartridge containing a disk-shaped recording medium (for example, the disk 4 of the above embodiment) is inserted into a cartridge holder,
The cartridge holder is placed in a direction in which a motor (for example, the motor drive shaft 14a and the turntable 15 are part of the motor) is arranged (for example, from the top to the bottom in the case of the configuration of FIG. Magnetic field generating means for recording information on the disk-shaped recording medium by a moving mechanism (for example, the coil 115 of the embodiment). ) Is moved toward the medium surface, whereby the magnetic field generating means is arranged close to the medium surface. In the mounting apparatus for a disk-shaped recording medium, the coupling of the disk-shaped recording medium to the motor is performed by: A permanent magnet (for example, the permanent magnet 34 of the embodiment) coupled to the motor drive shaft of the motor and the disc-shaped recording medium The first direction parallel to the medium surface (for example, from the front side to the back side of the sheet of FIG. 1 of the embodiment) is based on an attractive force acting between the conductive member (for example, the magnetic material 33 of the above embodiment). (For example, when viewed in the state of FIG. 1 of the embodiment), the moving mechanism is substantially perpendicular to the first direction and substantially perpendicular to the medium surface. A movable body including at least a portion extending along a second parallel direction (for example, the substantially horizontal direction in FIG. 1 of the embodiment) (for example, in the case of the configuration of FIG. 1, the arm 105 and the mounting plate). The movable body has a first position (for example, a position where the hole 109 and the shaft 104 of the above embodiment are arranged) and a second position (for example, the above embodiment). Hole 107 and a screw 119). Both are movably supported by at least one of the cartridge holder and the base, and the second position can be displaced around the first position when viewed in the first direction (e.g., In the case of the embodiment shown in FIG. 1, the second position is adapted to be displaceable about the first position along a substantially vertical trajectory), and the first position is related to the second position. (For example, the left end of the mounting plate 113 in FIG. 1 in the embodiment) can be displaced around the second position (for example, in the first embodiment).
In the case of the drawing, the left end of the mounting plate 113 can be displaced around the second position along a substantially vertical trajectory.)
And the magnetic field generating means is configured to be coupled at least to the movable body between the distal end portion and the second position. The present invention has the following effects.

As compared with the above-described prior art, there is an advantage that the magnetic field generating means can be accurately arranged close to the medium surface of the disk-shaped recording medium with a very simple configuration.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cartridge holder.

FIG. 2 is a plan view of the information recording / reproducing apparatus.

FIG. 3 is a bottom view of the information recording / reproducing apparatus.

FIG. 4 is a side view showing a cartridge holder.

FIG. 5 is a perspective view of an information recording / reproducing apparatus.

FIG. 6 is a side view showing an auto-loading mechanism.

FIGS. 7A and 7B are side views for explaining the operation of the auto-loading mechanism.

FIG. 8 is an exploded perspective view of a magnetic field application device.

FIGS. 9A to 9D are side views for explaining the operation of the magnetic field applying device.

FIG. 10 is a plan view of a disk cartridge.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 information recording / reproducing device 3 base 4 disk 5 cartridge 7 cartridge holder 10 bias magnetic field applying device 20 optical pickup 104 axis 105 arm 107 long hole 110 lever portion 112 magnetic field applying member 115 coil 119 screw

Claims (1)

[Claims] 1. After inserting a cartridge containing a disk-shaped recording medium into a cartridge holder, the cartridge-shaped holder is moved in a direction in which a motor is arranged to move the disk-shaped recording medium into the motor. And a magnetic field generating means for recording information on the disk-shaped recording medium by a moving mechanism is moved toward the medium surface so that the magnetic field generating means is arranged close to the medium surface. In the recording medium mounting device, the coupling of the disk-shaped recording medium to the motor acts between a permanent magnet coupled to a motor drive shaft of the motor and a magnetic member coupled to the disk-shaped recording medium. When the movement mechanism is viewed in a first direction parallel to the medium surface, the movement is based on a suction force. The mechanism has a movable body including at least a portion extending along a second direction perpendicular to the first direction and substantially parallel to the medium surface, wherein the movable body has a first position spaced apart from the first position. A second position, and movably supported by at least one of the cartridge holder and the base;
The second position is configured to be displaceable about the first position when viewed in the first direction and the movable position is opposite to the first position with respect to the second position; The tip of the body is configured to be displaceable around the second position, and the magnetic field generating means is configured to be at least coupled to the movable body between the tip and the second position. A mounting device for a disk-shaped recording medium, characterized in that: