JP2565962Y2 - Head loading mechanism for disk recorder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head loading mechanism of a disk recording apparatus for moving a recording / reproducing head for a recording disk toward and away from the recording disk.

[0002]

2. Description of the Related Art For example, a magneto-optical disk drive capable of repeatedly recording information on a magneto-optical disk has conventionally been initialized by a bias magnetic field generator (magnetic head) toward a recording layer of a loaded magneto-optical disk. After applying a bias magnetic field, the laser beam with high power emitted from the optical head is continuously converged to raise the temperature of the recording layer of the magneto-optical disk to the Curie temperature, thereby increasing the holding power of the recording layer. Make it disappear. After that, in the cooling process, the magnetization direction of the recording layer becomes the same direction as the bias magnetic field for initialization. After so-called initialization, the bias magnetic field is inverted to converge the laser light of high power intermittently on the recording layer. Thereby, information is recorded by reversing the direction of magnetization.

In the magneto-optical disk device having such a structure, in order to rewrite information of one track, it is necessary to rotate the magneto-optical disk for erasing and recording, respectively, which is disadvantageous in that the recording speed is low. Therefore, recently, by selectively applying a magnetic field of either S or N to a minute region corresponding to a region where laser light is converged, information can be rewritten only by rotating the disk once. A magneto-optical disk device of a modulation overwrite type has been proposed.

In the magneto-optical disk drive of the magnetic field modulation overwrite type, it is necessary to apply a high-speed modulated magnetic field to the magneto-optical disk in order to realize a rapid overwrite. It is necessary to reduce the size of the magnetic head and make it as close to the disk recording layer as possible. Further, the magnetic head close to the magneto-optical disk at the loading position needs to be held in a state as stable as possible.

[0005]

The purpose of the present invention is based on the above problem awareness, and it is possible to keep a recording / reproducing head close to a recording disk in a state as stable as possible. It is an object of the present invention to provide a head loading mechanism for a simple disk recording device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a head loading mechanism of a disk recording apparatus for moving a recording / reproducing head toward and away from a recording disk, wherein the head is movably supported in the radial direction of the recording disk. Stopper means for regulating the maximum approach position of the head base with respect to the recording disk; a preload plate provided on the head base and capable of moving toward and away from the recording head; and moving the preload plate to an approach position with respect to the recording head. A spring means provided on the head base for applying a biasing force to the head base to move toward the stopper means so that the head base comes into contact with the stopper means;
It is characterized by having. More specifically, the spring means is, for example, implanted in a preload plate and penetrates the head base from the recording disk side; and is supported by a protruding end of the stud from the head base, a part of which is supported by the head. A preload spring made of a leaf spring contacting the base. When the head base moves to a position approaching the recording head, the preload spring applies a biasing force to the head base via the stud toward the stopper means. Can be given. The mechanism for moving the preload plate into and out of contact with the recording disk includes, for example, providing a cam pin fitted in the cam groove of the guide cam plate on the preload plate, and moving the guide cam plate to move the preload plate toward and away from the recording disk. Can be.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 10 is a plan view showing a magneto-optical disk drive 20 of the magnetic field modulation overwrite type to which the present invention is applied, and FIG. 1 is a side view thereof. The magneto-optical disk drive 20 includes a cartridge holder 22 for holding the disk cartridge 11 loaded with the magneto-optical disk 12, an optical head base 21, and a linear bearing 51 provided on the optical head base 21 (see FIGS. 6) along the optical head 2
4 for moving the magnetic head 4 in the radial direction of the magneto-optical disk 12 and a magnetic head carriage 26 for moving the magnetic head 25 in the radial direction of the magneto-optical disk 12
have.

As shown in FIGS. 8 to 10, a cantilevered load beam 15 is fixed on the back surface of the magnetic head carriage 26 with its base positioned at the disk rotation center 12 a side of the magneto-optical disk 12. It is fixed by 69. A magnetic head 25 is attached to a free end of the load beam 15 facing the outer periphery of the magneto-optical disk 12. The load beam 15 is attached to the magnetic head pressing plate 70 in the state where the disk shown in FIG.
(FIG. 8 and FIG. 9), it bends downward until it comes into contact with it, and becomes slightly inclined downward. However, at the loading position in FIG. In a very close distance to the surface.

The disk cartridge 11 is configured to receive the magneto-optical disk 12 inward, and has a head access window 11a (FIGS. 4 to 6, and 10) on its upper surface.
And a shutter 54 that can be opened and closed to close and open the head access window 11a.

The cartridge holder 22 is turned on when the disk cartridge 11 is loaded, and
1 is provided. The cartridge holder 22 is also configured to be able to move up and down with respect to the optical head 24, is located away from the optical head 24 when the disk cartridge 11 is attached and detached, and comes close to the optical head 24 when the disk cartridge 11 is inserted. Move in the direction of
Can be set at a predetermined position.

Further, on the outside of the cartridge holder 22, the guide roller 50 provided on the optical head base 21 is slidable in the directions of arrows A and B in FIG. A guide cam plate 35 is provided. The left and right guide cam plates 35
Are cam grooves 40 and 4 for holders, each having a substantially crank shape.
2. Cam grooves 41 and 43 for magnetic head and long hole 125
have. Further, left and right fixed cam plates 49 are provided outside the guide cam plate 35, and the left and right fixed cam plates 4 are provided.
9, a cam groove 40 for the holder of the left and right guide cam plates 35,
42 and the magnetic head cam groove 41,
Up and down guide cam grooves 45, 47 and 46 are formed in the up and down direction. The left and right fixed cam plates 49 further have abutment projections 49a (FIGS. 1 to 3) cut and raised toward the guide cam plate 35 located in the middle of the left and right fixed cam plates 49,
The abutment projection 49a penetrates the elongated hole 125 of the guide cam plate 35 and projects inside the guide cam plate 35, and engages with the abutment portions 110 on the left and right of the magnetic head base 28 shown in FIG. The lowering position of the magnetic head base 28 is regulated.

On the left and right sides of the cartridge holder 22 in the disk moving direction, cam pins 36 and
The cam pin 36 is inserted into the holder cam groove 40 and the vertical guide cam groove 45, and the cam pin 38 is inserted into the holder cam groove 42 and the vertical guide cam groove 47. Also, cam pins 37 and 39 are provided on the left and right side surfaces of the magnetic head base 28, respectively.
The cam pin 37 is inserted through the magnetic head cam groove 41 and the vertical guide cam groove 46, and the cam pin 39 is inserted through the magnetic head cam groove 43.

The holder cam grooves 40 and 42 hold the cam pins 36 and 38 at the initial position (disk insertion / removal position) of the guide cam plate 35 shown in FIG. 1 and hold the disk cartridge 11 at the unloading position. Parts 40a, 42a, moving parts 40b, 42b for guiding the cam pins 36, 38 to move the disc cartridge 11 to the loading position when the guide cam plate 35 moves from the initial position to the loading position, and holding the moved position. It has loading sections 40c and 42c.
The loading portions 40c, 42c are formed substantially horizontally (in a direction parallel to the moving direction of the guide cam plate 35), and when the guide cam plate 35 moves further from the loading position, the cam pins 36, 38 are not moved up and down. And the disc cartridge 11 is continuously held at the loading position.

The magnetic head cam grooves 41 and 43 hold the cam pins 37 and 39 at the initial position (disk insertion / removal position) of the guide cam plate 35 shown in FIG.
The unloading portions 41a and 43a for holding the (magnetic head carriage 26) at the unloading position and the cam pins 37 and 39 when the guide cam plate 35 moves from the initial position to the intermediate position, and the magnetic head 25 is moved to the unloading position. And moving parts 41b and 43b for moving to intermediate steps 41c and 43c which are intermediate positions of the loading position.
When the guide cam plate 35 moves from the intermediate position to the loading position, the moving unit 41d guides the cam pins 37 and 39 to move the magnetic head 25 to the loading position.
43d, and the magnetic head 2 holding the cam pins 37 and 39.
Loading section 41 for holding 5 in the loading position
e, 43e.

A rack plate 59 and a switch operation plate 60 are fixed to the guide cam plate 35. In addition, in the device body,
A drive motor 61 and a gear box 62 for transmitting the rotation of the drive motor 61 are provided. The rotation of the drive motor 61 is transmitted to the rack plate 59 via the pinion gear 63 as linear motion. The drive motor 61 is driven to rotate normally based on a loading switch 80 which is turned on when the disc cartridge 11 is loaded into the cartridge holder 22 and pressed in the loading direction.

The apparatus main body includes first, second, and third detection switches 65, 66, and 6 corresponding to the switch operation plate 60.
7 are provided. These detection switches 65, 6
6, 67 are switch levers 65a, 66a, respectively.
67a. Detection switches 65, 66, 67
Is the switch operation plate 6 which moves together with the guide cam plate 35.
When 0 presses or releases the switch levers 65a, 66a, 67a, the switch is turned on or off, and based on this, the position of the guide cam plate 35 is detected. By this detection, it is possible to detect which state (position) the disk cartridge 11 and the magnetic head base 28 are in.

In other words, the switch operating plate 60 turns off the first detection switch 65 and the second detection switch 66 and the third detection switch 67 at the disk insertion / removal position in FIG.
Is turned on, the first detection switch 65 and the third detection switch 67 are turned off in the reproduction position of FIG. 2, and the second detection switch 66 is turned on. In the recording / reproduction position of FIG. The switch 65 is turned on, and the second detection switch 66 and the third detection switch 67 are turned off.

The discrimination circuit (not shown) uses these different bit signals to determine whether the magneto-optical disk drive 20 has the magnetic head 25 and the disk cartridge 11 at the unloading position and the disk cartridge 11 can be detached. A detachable state (FIG. 1), a reproducible state in which the disc cartridge 11 is located at the loading position and the magnetic head 25 is located between the unloading position and the loading position and reproduction using only the optical head 24 is possible (FIG. 2). ) And whether the magnetic head 25 together with the disk cartridge 11 is in the recording / reproducible state (FIG. 3) at the loading position.

The magneto-optical disk 12 used in this embodiment
For example, an optical code signal indicating whether the disc is a double-sided disc or a single-sided disc can be written in a control track on the inner peripheral side. This optical code signal is read by the optical head 24 in the state of FIG. 2 where the disk cartridge 11 is at the loading position and the magnetic head 25 is waiting at the intermediate position. Based on this, the disc discriminating means 68 (FIG. 10) discriminates whether the loaded magneto-optical disc 12 is for one side or both sides. When it is determined that the magneto-optical disk 12 is for both sides, the guide cam plate 35 is not moved any more, so that only the reading by the optical head 24 is possible. When it is determined that the magneto-optical disk 12 is for one-sided use, the magnetic head 25 is moved to the loading position in order to drive the drive motor 61 forward to move the guide cam plate 35 further in the same direction. It becomes a state where reading and recording are possible.

Here, the configurations of the optical head linear motor mechanism 127 for transferring the optical head 24 and the magnetic head linear motor mechanism 91 for transferring the magnetic head 25 will be described.

First, the optical head carriage 23 that supports the optical head 24 is movably supported along the radial direction of the magneto-optical disk 12 via a linear bearing 51, as shown in FIGS. I have. The optical head carriage 23 includes a coil 52 fixed to both ends thereof and a yoke 5
3b is movably fitted. The yoke 53b is connected to a permanent magnet 53a located at the center of the yoke 53b.
3, the yoke 53b and the permanent magnet 5
The 3a and the coil 52 constitute a linear motor mechanism 127 for an optical head. Also, the linear bearing 51
It is composed of a fixed member 71, a slider 72, and a ball 73 interposed between the fixed member 71 and the slider 72. The fixing member 71 is a substantially U-shaped and elongated member attached to the optical head base 21 side, and the slider 72 is attached to the optical head carriage 23 side, It is a member that is narrow, approximately U-shaped and long. Rolling grooves are formed on opposing side surfaces of the fixing member 71 and the slider 72, and a ball 73 is fitted between the opposing rolling grooves.

The optical head 24 transmits the light beam from the laser light source to the magneto-optical disk 12 by the objective lens 8 (FIG. 1).
During reproduction, the reflected light from the magneto-optical disk 12 is received to read the magneto-optical recording signal. At the time of recording, the laser light is converged on the magneto-optical disk 12 with a larger power than during reproduction to reduce the temperature of the recording layer. The temperature is raised to the Curie temperature, and information is overwritten on the recording layer in cooperation with the magnetic head 25.

On the other hand, the magnetic head carriage 26 supporting the magnetic head 25 is provided with a linear bearing 5 mounted on a magnetic head base 28 via a base plate 87.
5 supports the magneto-optical disk 12 so as to be movable in the radial direction. The magnetic head carriage 26 has coils 56 fixed to both ends thereof movably fitted to a yoke 57b. The yoke 57b forms a magnetic circuit 57 with a permanent magnet 57a located at the center of the yoke 57b. The yoke 57b, the permanent magnet 57a, and the coil 56 form a linear motor mechanism 91 for a magnetic head. Further, the linear bearing 55 is fixed to the fixing member 7.
5, slider 76, and fixing member 75 and slider 7
6 is constituted by a ball 77 interposed between them.
The fixing member 75 is a substantially U-shaped and elongated member attached to the optical head base 21 side. The slider 76 is attached to the optical head carriage 23 side, It is a member that is narrow, approximately U-shaped and long. Rolling grooves are formed on opposing side surfaces of the fixing member 75 and the slider 76, and a ball 77 is fitted between the opposing rolling grooves.

As shown in FIG. 1, at the end of the magnetic head carriage 26, two sets of reflection type photo sensors (photo interrupters) 3 having both light emitting / receiving elements are provided.
Reference numerals 0 and 31 are provided. On the other hand, a reflection plate 32 facing the reflection type photosensor 30 is mounted on a reflection plate holding portion 27 provided at an end of the optical head carriage 23. Light emitted from the light emitting elements of the two sets of reflective photosensors 30 and 31 and reflected by the reflecting plate 32 enters respective light receiving elements. When the outputs of the two light receiving elements become equal, the two carriages 23 and 26
The vertical position is set so as to sandwich the 25 magneto-optical disks 12. Then, the optical head carriage 2
Numeral 3 is driven in the radial direction of the magneto-optical disk 12 by a signal from a control device (not shown), and the output of the magnetic head carriage 26 from the two light receiving elements is made equal by a synchronous circuit (not shown). Is controlled. As a result, the magnetic head carriage 26 moves in synchronization with the optical head carriage 23 so that the heads 24 and 25 always face up and down correctly.

As shown in FIGS. 7 and 8, the magnetic head base 28 is formed in a substantially rectangular shape when viewed in plan. have. The magnetic head base 28 further has a positioning portion 97 having positioning holes 97a at both front ends thereof, and a positioning opening 1 formed in a central portion in a rectangular shape slightly smaller than a rectangular base plate 87.
12. The lower surface of the positioning portion 97 is an abutting surface 97b that abuts a regulating surface 90a (FIGS. 1 to 3) of a stopper pin 90 erected on the optical head base 21 of the apparatus main body. The restricting surface 90a (fixed-side stopper) of the stopper pin 90, the positioning portion (movable-side stopper) 97 of the magnetic head base 28, the abutting projection (fixed-side stopper) 49a of the fixed cam plate 49, and the magnetic head base 28 The abutting portion (movable-side stopper) 110 constitutes stopper means for regulating the maximum proximity position of the magnetic head base 28 to the magneto-optical disk 12. That is,
When the guide cam plate 35 is moved to the recording / reproducing position shown in FIG. 3 and the magnetic head base 28 is lowered via the cam pins 37 and 39 fitted in the magnetic head cam grooves 41 and 43, the regulating surface The abutment surface 97b abuts against the abutment portion 110, and the abutment projection 49a abuts against the abutment portion 110. The distal end portion 90b of the stopper pin 90 fits into the positioning hole 97a of the positioning portion 97, and has a tapered shape that guides the contact surface 97b of the positioning portion 97 toward the regulating surface 90a.

At both left and right ends of the magnetic head base 28 with respect to the disk loading direction, preload plates 93 are respectively mounted. When the magnetic head base 28 is lowered to the state shown in FIG. 3, the preload plate 93 applies a moving urging force to the magnetic head base 28 on the side that comes into contact with the stopper means. The above-mentioned cam pin 3
7, 39 are fixed to the left and right preload plates 93. Each preload plate 93 has a bent locking claw 93a at its inner end, and a magnetic head base 2 at the center.
8 has a stud 95 slidably fitted in the through hole 111 (FIGS. 4 to 6).

The magnetic head base 28 has projecting holes 96 at positions adjacent to the left and right through holes 111 for projecting the locking claws 93a upward to be locked on the upper surface of the magnetic head base 28. Is formed. The locking claw 93a
4 to 6 are inserted from below into the protruding holes 96 and locked to the upper surface of the magnetic head base 28 as shown in FIGS.
The stud 95 protruding from the preload plate 93 is inserted into the through hole 111 from the back surface, and a preload spring 94 abutting on the magnetic head base 28 is fixed to the protruding end via an E-ring or the like.

The preload spring 94 is configured to be long as viewed in plan as shown in FIG. 7, and is formed to have a mountain shape near both ends in the long direction as viewed in side view as shown in FIG. It is a leaf spring, and has pressing projections 94 a protruding toward one side at both ends thereof and abutting against the magnetic head base 28. Accordingly, as shown in FIG. 7, in a state where the preload plate 93 and the preload spring 94 are set on both sides of the magnetic head base 28, the preload plate 93
Is lowered by the cam pins 37 and 39 as shown in FIG. 3, the preload plate 93 is moved through the locking claws 93a.
The biasing force received from the preload spring 94 via the stud 95 is exerted on the magnetic head base 28 to move and bias the head base 28 downward.

As a result, the contact surface 97b and the contact portion 110 of the positioning portion 97 of the magnetic head base 28 are elastically pressed against the regulating surface 90a of the stopper pin 90 and the contact projection 49a of the fixed cam plate 49, respectively. Will be done.

In other words, in the recordable / reproducible state in which the magnetic head 25 is loaded (FIG. 3), the cam pins 37 and 39 are connected to the preload spring 94 and the preload plate 93.
Of the magnetic head cam grooves 41 and 43, the upper surfaces of the loading portions 41e and 43e of the magnetic head cam grooves 41 and 43 do not play elastically.
7 b and the abutment portion 110 are provided on the regulating surface 90
a and the abutting projection 49a of the fixed cam plate 49 does not play elastically, so that the positioning accuracy of the magnetic head 25 is improved, and as much as possible with respect to the magneto-optical disk 12 at the loading position. The magnetic head 25 in a stable state.
, And stable recording characteristics can be obtained.

As shown in FIG. 7, the base plate 87 has two rectangular openings 87a formed so as to be orthogonal to the line connecting the guide notches 99 at both ends. A positioning fixing portion 113 for fixing the fixing member 75 of the linear bearing 55 is provided between them. The fixing member 75 (FIG. 4) has two screw holes formed along the longitudinal direction of the fixing member 75 (FIG. 4).
Reference numeral 13 has two position adjustment holes (not shown) corresponding to the two screw holes in the longitudinal direction. The position adjusting hole is formed smaller than the head of the fixing screw 103 to be inserted and larger than the screw portion. The position adjusting hole formed in the base plate 87 and the fixing screw 103 to be inserted into the position adjusting hole allow the optical head carriage 27 having the reflecting plate 32 and the optical head 24 to be moved.
A position adjusting mechanism for adjusting the parallelism of the magnetic head carriage 26 having the photo reflectors 30 and 31 and the magnetic head 25 is configured.

As shown in FIG. 9, at four corners of the base plate 87, position adjusting holes 98 smaller than the head of the fixing screw 101 to be inserted and larger than the screw portion are formed. Positioning opening 112
A screw hole 120 around which the fixing screw 101 is screwed is formed around the position adjusting hole 98 so as to correspond to the position adjusting hole 98 (FIG. 8).
(FIG. 8). On the left and right sides of the positioning opening 112 on the upper surface of the magnetic head base 28, rotation restricting guide pins 100 are implanted. The rotation restricting guide pins 100 slidably engage guide notches 99 formed at both right and left ends of the base plate 87, and guide the base plate 87 in the longitudinal direction of the magnetic head base 28. Further, in the state of FIG. 7 in which the two guide notches 99 are engaged with the two rotation control guide pins 100, respectively, between the rotation control guide pin 100 and the inner side of the guide notch 99. The positional relationship is set so that a gap s is formed. The magnetic head 25 is moved by the fixing screw 101, the position adjusting hole 99, and the rotation restricting guide pin 100 in a direction intersecting the moving direction of the magnetic head 25 and the optical head 24 (the left-right direction with respect to the disk loading direction). A position adjusting mechanism for adjusting the position of the magnetic head base 28 with respect to the magnetic head base 28 is configured.

The present magneto-optical disk drive 2 having the above configuration
0, when the disc cartridge 11 loaded in the cartridge holder 22 is pressed in the loading direction, the loading switch 80 is turned on, and based on this, the drive motor 61 is driven to rotate forward and the guide cam plate 35 is moved to the rack plate 5.
9 is moved in the arrow A direction from the disk insertion / removal position in FIG.

Then, the disc cartridge 11, which was in the unloading position at the disc insertion / removal position of the guide cam plate 35 (FIG. 4), moves the guide cam plate 35 from the disc insertion / removal position to the reproduction position in FIG. Accordingly, the cam pins 36, 38 are guided by the moving parts 40b, 42b of the elevating cam grooves 40, 42, and the lower surface thereof is used as a guide roller 50 serving as a reference surface provided on the optical head base 21.
Down until it comes into contact with the upper surface 50a. At this time,
As in the case of the disk cartridge 11, the magnetic head 25 at the unloading position at the disk insertion / removal position of the guide cam plate 35 moves as the guide cam plate 35 moves from the disk insertion / removal position to the reproduction position in FIG. The cam pins 37, 39 are guided by moving portions 41b, 43b of the magnetic head cam grooves 41, 43, and the cam pins 37, 39 are guided.
Are positioned in the intermediate steps 41c and 43c, and are made to wait at a reproduction position intermediate between the unloading position and the recording / reproduction position (FIGS. 2 and 5).

At this time, the first detection switch 65 is operated by the switch operation plate 60 which moves together with the guide cam plate 35.
And the third detection switch 67 are turned off and the second detection switch 66 is turned on. Based on this, it is detected that the cartridge holder 22 is at the loading position and the magnetic head 25 is at the reproducing position. Then, the optical code signal written on the magneto-optical disk 12 is read by the optical head 24, and based on the optical code signal, the disk determining means 68 determines whether the loaded magneto-optical disk 12 is for one side or for both sides. To determine if it is

As a result, if it is determined that the magneto-optical disk 12 is for both sides, the drive motor 61 is not driven, and the guide cam plate 35 is not moved any further. Only the reproduction using is possible. On the other hand, when it is determined that the magneto-optical disk 12 is for one side, the drive motor 61 is driven to rotate forward, and
As a result, the magneto-optical disk device 20
Are moved further in the same direction, and the magnetic head 25 is moved to the loading position, and the recording and reproduction are enabled (FIGS. 3 and 6). At this time, as described above,
Cam pins 37 and 39 provided on the preload plate 93
The loading portion 4 of the magnetic head cam grooves 41 and 43 is formed by the elastic force of the preload spring 94 and the preload plate 93.
There is no play due to elastic contact with the upper side surfaces 1e and 43e, and the contact surface 97b of the magnetic head base 28 and the contact portion 110 are in contact with the regulating surface 90a of the stopper pin 90 and the fixed cam plate 49. There is no play due to elastic contact with the projection 49a. Therefore, the magnetic head 25 is in a stable state with respect to the magneto-optical disk 12 at the loading position, and can obtain stable recording characteristics.

[0037]

As described above, according to the present invention, the positioning accuracy of the recording / reproducing head is improved, and the magnetic head approaching the recording disk is kept as stable as possible. Therefore, stable recording characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing a magneto-optical disk drive according to the present invention at a disk insertion / removal position.

FIG. 2 is a side view at the reproducible position.

FIG. 3 is a side view at the recordable / reproducible position.

FIG. 4 is a diagram showing a state in which the magneto-optical disk device of FIG. 1 is viewed from the direction of arrow D in FIG.

5 is a diagram showing the magneto-optical disk device of FIG. 2 as viewed from the direction of arrow E in FIG.

6 is a diagram showing the magneto-optical disk device of FIG. 3 as viewed from the direction of arrow F in FIG.

FIG. 7 is a plan view showing a head loading mechanism of the disk recording device of the present invention.

FIG. 8 is a bottom view showing a magnetic head base and the like of the head loading mechanism.

FIG. 9 is a bottom view showing a base plate and a linear bearing and a magnetic head attached to the base plate.

FIG. 10 is a plan view showing the entire magneto-optical disk device of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Disk cartridge 12 Magneto-optical disk (recording disk) 20 Magneto-optical disk drive 22 Cartridge holder 25 Magnetic head (recording / reproducing head) 26 Magnetic head carriage 28 Magnetic head base (Head base) 35 Guide cam plate 37 39 Cam pin 49a Protrusion (stopper means) 90 Stopper pin (stopper means) 90a Restriction surface (stopper means) 93 Preload plate 94 Preload spring (spring means) 94a Pressing protrusion 95 Stud 97 Positioning section 110 Abutment section (stopper means)

Claims (3)

(57) [Scope of request for utility model registration] 1. A head loading mechanism of a disk recording apparatus for moving a recording / reproducing head toward and away from a recording disk, wherein the head base supports the head movably in a radial direction of the recording disk. Stopper means for restricting the maximum approach position to the recording disk; a preload plate provided on the head base and capable of moving toward and away from the recording head; and when the preload plate moves to the approach position to the recording head, the preload plate moves to the head base. A head loading mechanism for a disk recording device, comprising: spring means provided on the head base for applying a biasing force to move to the stopper means side and bringing the head base into contact with the stopper means. 2. The head loading mechanism according to claim 1, wherein said spring means is studs implanted in said preload plate and penetrates a head base from a recording disk side; and a stud projecting from said head base. And a preload spring, which is a leaf spring, a part of which is in contact with the head base. When the head base moves to a position approaching the recording head, the preload spring is attached to the head base via a stud. A head loading mechanism of a disk recording device for applying a biasing force toward the stopper means. 3. The head loading mechanism according to claim 1, wherein the preload plate has a cam pin that fits into a cam groove of the guide cam plate, and the guide cam plate moves to move toward and away from the recording disk. Head loading mechanism for disc recording devices.