JP3352451B2 - Head transfer mechanism of magnetic recording / reproducing device - 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 transfer mechanism of a magnetic recording / reproducing apparatus, and more particularly, to a head transfer mechanism in which a carriage having a lower magnetic head and a hold case having an upper magnetic head are hinged. .

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus for recording / reproducing information on / from a magnetic disk incorporated in a disk cartridge, a screw shaft which rotates by using a stepping motor as a driving source, and a rotation of the screw shaft A head transfer mechanism including a carriage or the like reciprocated in the radial direction of the magnetic disk is provided. A hold case is hinged on the carriage, and a load spring that elastically biases the hold case in the carriage direction is engaged with the carriage. A pair of upper and lower magnetic heads are mounted on the carriage and the hold case.

In the magnetic recording / reproducing apparatus having the above-described structure, when a disk cartridge is mounted, a holder for holding the disk cartridge is lowered from an unloading position to a loading position. Since the hold case rotates in the carriage direction about the hinge portion, the lower magnetic head of the carriage and the upper magnetic head of the hold case are pressed against each other via the magnetic disk. In this state, when the screw shaft rotates by driving the stepping motor, the rotation is transmitted to the carriage, so that the carriage and the hold case reciprocate in the radial direction of the magnetic disk along the guide shaft, and both magnetic heads are moved. Recording and reproduction of information are performed on the magnetic disk rotating from the beginning. Conversely, when the holder rises from the loading position to the unloading position, the hold case rotates in the direction away from the carriage, so that when the disc cartridge is not mounted, both magnetic heads are separated. Will be maintained.

FIG. 48 is a plan view showing a conventional example of such a head transfer mechanism, and FIG. 49 is a sectional view thereof. As shown in these figures, a guide shaft 10
1 and a screw shaft 102 are disposed in parallel with each other, and the screw shaft 102 is configured to rotate using a stepping motor (not shown) as a drive source.
A carriage 103 is slidably fitted to the guide shaft 101, and a lower magnetic head 104 is attached to a tip end of the carriage 103. An engagement projection 103a is formed on the side surface of the carriage 103 so as to project therefrom. The engagement projection 103a is engaged with a screw groove of the screw shaft 102. A follower spring 105 is screwed to the carriage 103. The screw shaft 102 is sandwiched between the follower spring 105 and the engagement protrusion 103a of the carriage 103, so that the engagement protrusion 103a is screwed to the screw shaft 102. Are stably engaged with the screw grooves. Further, a leaf hinge spring 107 integrated with the hold case 106 is screwed to a rear end of the carriage 103, and an upper magnetic head 108 is attached to a tip of the hold case 106. A load spring 109 composed of a torsion coil spring is hung between the carriage 103 and the hold case 106. The load spring 109 moves the hold case 106 in the direction of the carriage 103, that is, the upper magnetic head 108 It is urged in a direction in which it comes into pressure contact with the head 104. A first support arm 106a and a second support arm 106b are formed on both sides of the hold case 106, respectively.
106b receives the spring force from the load spring 109 and abuts on the top surface of the holder 110. The holder 110 moves up and down between an unloading position and a loading position in cooperation with a slide plate (not shown).

In the head transfer mechanism configured as described above, in the unloading state shown in FIG. 49, the hold case 106 is lifted upward by the holder 110, and the upper magnetic head 108 is
04 away. On the other hand, when a disc cartridge (not shown) is mounted and the holder 110 is lowered from the unloading position to the loading position while holding the disc cartridge, the hold case 106 moves the base of the leaf hinge spring 107 with the movement of the holder 110. The upper magnetic head 108 and the lower magnetic head 104 come into contact with the front and back surfaces of the magnetic disk housed in the disk cartridge as the fulcrum. In this state, when the stepping motor is driven to rotate the screw shaft 102, the rotation is transmitted to the carriage 103 via the screw groove and the engaging projection 103a, and the carriage 103 is moved along the guide shaft 101 by the magnetic disk. Since the magnetic disk reciprocates in the radial direction, information is recorded / reproduced on / from the rotating magnetic disk from the upper magnetic head 108 and the lower magnetic head 104.
Conversely, when the holder 110 rises from the loading position to the unloading position, the hold case 106 rotates in a direction away from the carriage 103 with the holder 110, and as shown in FIG.
08 and the lower magnetic head 104 are in the separated state again.

[0006]

By the way, in the head transfer mechanism of the above-mentioned conventional magnetic recording / reproducing apparatus, in the unloading state shown in FIG.
06 is lifted upward by the first support arm 106a and the second support arm 106b abutting on the holder 110, and the carriage 103 receives the spring force from the follower spring 105 so that the engagement protrusion 103a
02. At this time, the upward force of F1 and F2 acts on the first support arm 106a and the second support arm 106b of the hold case 106, respectively, and the downward force of F3 acts on the engagement convex portion 103a of the carriage 103. Assuming that the distances from the guide shaft 101 to the action points F1, F2, F3 are a, b, c, the moment around the guide shaft 101 is F1 · a + F3 · c in the direction of arrow A, and F2 · b in the direction of arrow B. Becomes Here, in order that the carriage 103 does not rise from the chassis 100 and the engagement between the engagement protrusion 103a and the screw shaft 102 is stably maintained, the moment in the direction of arrow A is larger than the moment in the direction of arrow B. That is, the relationship of F1 · a + F3 · c> F2 · b must be established.

However, the magnitudes of the forces F1 and F2 fluctuate due to the variation in the spring force of the load spring 109, and the magnitude of the force F3 varies due to the variation in the spring force of the follower spring 105 itself and the carriage force of the follower spring 105. Since the value varies depending on the tightening force of the screw at the time of attachment to the screw 103 and it is difficult to keep the tightening force of the screw constant from the viewpoint of work, the value of the force F3 may vary greatly.
When the relationship of the above equation is broken and F1 · a + F3 · c <F2 · b, the engagement convex portion 103a of the carriage 103 is easily detached from the screw shaft 102, and the operation of the head transfer mechanism may malfunction. there were.

As another conventional example, a head transfer mechanism in which only the first support arm 106a is formed in the hold case 106 and the second support arm 106b is omitted is also known. In this equation, since F2 · b = 0 in the above equation, the force F3
Is large, the carriage 103 does not float up from the chassis 100. However, when the hold case 106 receives a large external force due to a fall or the like, the hold case 106
The upper magnetic head 108 tilts with the contact portion between the support arm 106a and the holder 110 as a fulcrum, and the lower magnetic head 104
There was a problem of being damaged by bumping into. Further, the hold case 106 holds only the first support arm 106a with the holder 1
Hold case 1 to rotate as the point of action with
There is another problem that a torsional moment acts on the plate-shaped leaf hinge spring 107 integrated with the spring 06 and the leaf hinge spring 107 is deformed for many years.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances of the prior art, and has as its object to provide a head transfer mechanism of a magnetic recording / reproducing apparatus which can prevent the magnetic head from being damaged while preventing the carriage from floating. Is to do.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a screw shaft which is rotated by a motor as a drive source, a guide shaft disposed in parallel with the screw shaft, and a slide shaft slidable on the guide shaft. A carriage fitted with a lower magnetic head attached to the distal end, a follower spring that presses the engaging projection provided on the carriage to the screw groove of the screw shaft, and an upper magnetic head attached to the distal end A hold case hinged to the rear end of the carriage via a leaf hinge spring; and a hook interposed between the hold case and the carriage to urge the upper magnetic head toward the lower magnetic head. A first support arm extending in the guide shaft direction on both sides of the hold case; A second support arm extending in the direction of the screw shaft is formed, and the first support arm is brought into contact with a top surface of a holder that moves up and down between an unloading position and a loading position. This is achieved by forming the second support arm at a position farther from the hinge connection portion of the hold case than the first support arm and facing the second support arm at a predetermined interval with the top surface of the holder.

In the head transfer mechanism of the magnetic recording / reproducing apparatus configured as described above, in the unloading state in which the holder is raised, only the first support arm extending toward the guide shaft comes into contact with the top surface of the holder. The upper magnetic head is lifted, and is kept away from the lower magnetic head. At this time, only the moment in the direction of engaging the engagement protrusion of the carriage with the screw shaft acts around the guide shaft, so that the carriage is surely lifted regardless of the variation in the spring force of the load spring or follower spring. Is prevented. In addition, a second support arm extending in the screw shaft direction is formed on the hold case, and a predetermined interval is formed between the second support arm and the top surface of the holder. Even if a large force is received, the hold case does not further tilt in the carriage direction when the second support arm collides with the holder, so that the upper magnetic head and the lower magnetic head are prevented from being damaged. In addition, since the second support arm is formed at a position farther from the hinge connection portion of the hold case than the first support arm, a clearance required between the second support arm and the top surface of the holder is secured. Thus, the thickness of the second support arm can be made as large as possible, and the second support arm reliably prevents damage to the upper magnetic head and the lower magnetic head.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 47 illustrate an embodiment of the present invention, and FIG. FIG. 2 is a front view of the magnetic recording / reproducing apparatus, FIG. 3 is a rear view of the magnetic recording / reproducing apparatus, FIG. 4 is a side view of the magnetic recording / reproducing apparatus, FIG. FIG. 7 is a plan view showing the chassis with the upper cover removed from FIG. 1, FIG. 7 is a rear view thereof, FIG. 8 is a side view thereof, FIG. 9 is a plan view showing the chassis with the holder removed from FIG. 6, FIG.
11 is a side view of the chassis, FIG. 12 is a perspective view showing guide projections and projections of the chassis, FIG. 13 is a plan view of a slide plate, FIG. 14 is a rear view of the slide plate, and FIG. FIG. 16 is a cross-sectional view showing an engagement state between the chassis and the slide plate, FIG. 17 is a plan view of the holder, FIG. 18 is a rear view of the holder, FIG. 19 is a side view of the holder, and FIG.
Is an explanatory view showing a state where the outer shape of the holder is removed from the base material,
FIG. 21 is a perspective view showing a main part of the shutter opening / closing mechanism.

As shown in FIGS. 1 to 4, a magnetic recording / reproducing apparatus according to the present embodiment comprises an upper cover 1 and a lower cover 2 which are joined and integrated with each other to form a housing; It comprises a mechanism body housed inside the covers 1 and 2, and a front plate 3 attached to the front opening of the upper and lower covers 1 and 2. The front plate 3 has a horizontally long insertion opening 3a, and an ejection button 4 described later.
Are arranged so that they can enter and exit. A door 5 is rotatably supported on the rear side of the front plate 3, and the door 5 is urged by a torsion coil spring (not shown) in a direction to close the insertion opening 3a.

The disk cartridge 6 used in the magnetic recording / reproducing apparatus is a known one, and as shown in FIG.
Cartridge case 7 molded of hard plastic
And a magnetic disk 8 rotatably housed inside the cartridge case 7 and a shutter 9 that can reciprocate along one side edge of the cartridge case 7. One corner of the cartridge case 7 is cut off in a tapered shape, and the portion serves as an erroneous insertion preventing portion 7a.
The shutter 9 is bent in a U-shape, and rectangular window holes 9a are formed on both upper and lower surfaces thereof. The cartridge case 7 also has openings 7b corresponding to the window holes 9a. The shutter 9 is opened by a spring (not shown).
However, when the disk cartridge 6 is inserted into the front panel 3 through the insertion opening 3a, the shutter opening / closing mechanism described later moves the opening 7b and the window hole 9a in a direction in which the opening 7b coincides with the window hole 9a. The magnetic disk 8 is moved so that the magnetic disk 8 is exposed from the opening 7b and the window hole 9a.

As shown in FIGS. 6 to 9, the mechanism body includes a chassis 10 fixed to the upper surface of the lower cover 2.
And a slide plate 11 mounted on the upper surface of the chassis 10 so as to be able to move forward and backward, a holder 12 held by the slide plate 11, and the like. Hereinafter, these chassis 10
The specific configuration of the slide plate 11 and the holder 12 will be described.

The chassis 10 is made of an iron plate, which is a base material, with zinc plating on both upper and lower surfaces. As shown in FIGS. 10 to 12, upright walls 10a and 10b are formed at both front and rear ends of the chassis 10, respectively, and a circular hole 10c is formed near the front upright wall 10a. Around the circular hole 10c, a plurality of L-shaped guide protrusions 10d are formed by bending at right angles to the bottom surface.
Two pieces are formed on one side of 0, and four pieces are formed on both left and right sides. A plurality of protrusions 10e are formed on the bottom surface of the chassis 10 so as to protrude upward, and these protrusions 10e are arranged near each guide protrusion 10d, preferably within 10 mm. Each of the protrusions 10e is formed by pressing the chassis 10 in the thickness direction. As described above, the chassis 10 is previously plated with zinc. Therefore, the surface of each of the protrusions 10e is plated with zinc. Will have a flat surface. A plurality of reinforcing ribs 10f are formed on the bottom surface of the chassis 10, and are opposed to two stopper projections 10g that define the lowered position of the disk cartridge 6 and a rear standing wall 10b at a predetermined interval. The supporting wall 10h is bent. Further, notches 10i are formed on both left and right sides of the chassis 10, and screw holes 10j are formed in the rear standing wall 10b.

Like the chassis 10, the slide plate 11 is made of an iron plate, which is a base material, and is plated with zinc on both upper and lower surfaces. As shown in FIGS. 13 to 15, the slide plate 11 is bent and formed in a U-shaped cross section, and an opening 11a is formed in the center of the bottom surface.
At the front and rear ends of the slide plate 11, mounting pieces 11b and locking claws 11c are formed by bending, respectively, and the eject button 4 is mounted on the mounting pieces 11b. Further, a plurality of guide holes 11d and one insertion hole 11f are formed in the bottom surface of the slide plate 11, and two slide holes are formed on one side of the slide plate 11.
Four cam grooves 11e are formed on both left and right sides. The slide plate 11 is provided with each guide hole 11d by the guide protrusion 1.
0d and one stopper projection 10g, and the other stopper projection 10g is placed on the chassis 10 in a state of being inserted into the insertion hole 11f, and each guide hole 11d is moved vertically and horizontally by the corresponding guide projection 10d. As a result, the chassis 10 can be moved only in the front-rear direction of the chassis 10 (see FIG. 9). At that time, FIG.
As shown in FIG. 6, the lower surface of the slide plate 11 is
The sliding plate 11 slides on the upper surface of each of the projections 10e, and the lower surface of the slide plate 11 and the upper surface of the projection 10e are both galvanized.
Can be slid smoothly.

Like the chassis 10 and the slide plate 11, the holder 12 is made of an iron plate, which is a base material, and is plated with zinc on both upper and lower surfaces. 17 to 19
As shown in FIG. 2, the holder 12 is formed to be bent in an inverted U-shaped cross section, and a support piece 12a opposed to the upper surface of the holder 12 at a predetermined interval is formed at the lower end of both side surfaces thereof. A swelling portion 12b slightly swelling upward is formed on the upper surface of the holder 12. The swelling portion 12b has a long hole 12c having a concave shape in a plan view and extending toward the rear end, and an arc-shaped escape hole 12d. Is formed. In the vicinity of the bulging portion 12b, a retaining projection 12e is formed by bending, and a locking hole 12f is formed. Also, the holder 12
A stopper protrusion 12g having a convex shape in a plan view is formed at the front end of the upper surface of the hole 12, and the width W1 of the stopper protrusion 12g is set to be equal to or less than the width W2 of the elongated hole 12c (W1 ≦ W2). Further, on the side surface of the holder 12, four projections 12h are formed on each of the left and right sides, two on each side, and a hanging piece 12i extending downward is formed.

As shown in FIG. 20, the holder 12 is formed by punching a flat base material (galvanized iron plate) and then bending the same.
It is formed into the shape as described above. When the outer shape is removed, the relationship between the width dimension W1 of the stopper projection 12g and the width dimension W2 of the elongated hole 12c is set to W1 ≦ W2, so that the stopper projection 12g formed on an arbitrary holder 12 is set.
Is located in the elongated hole 12c formed in the adjacent holder 12, so that scrap generated from the base material can be reduced as much as possible. That is, the concave long hole 12
The convex portion remaining on the base material when the outer shape of c is removed is originally discarded as scrap, but since the portion can be used as a stopper projection 12g of another holder 12,
The amount of waste of the base material can be reduced.

Referring back to FIGS. 6 to 9, the holder 12 is inserted between both side surfaces of the slide plate 11, and a tension spring 1 is provided between the upper surface of the holder 12 and one side surface of the slide plate 11.
3 is engaged. Here, the hanging piece 12 of the holder 12
i penetrates the bottom surface of the slide plate 11 and
The holder 12 is restricted so as to be able to move only in the vertical direction with respect to the chassis 10 by the engagement between the hanging pieces 12i and the notches 10i.
On the other hand, as described above, the slide plate 11 is
The slide plate 11 can be moved only in the front-rear direction.
Is urged toward the front end of the chassis 10 by a tension spring 13. A turning member 14 is disposed behind the slide plate 11 and the holder 12, and the turning member 14 is rotatably supported on a support shaft 15 implanted in the chassis 10, and a torsion coil spring is provided. 16 is urged in the counterclockwise direction in FIG.

The rotating member 14 is made of a plastic molding material. As shown in FIG.
A cylindrical shaft portion 14a inserted into the support shaft 15;
It has a pair of arms 14b, 14c that project laterally from 4a. A pair of hook-shaped support walls 14d and 14e are formed at the upper end of the shaft portion 14a.
The torsion coil spring 16 is wound around 4d and 14e. At this time, a pair of slits 14f extending in the axial direction is formed between the support walls 14d and 14e, and
Since the one support wall 14e is formed thicker than the other support wall 14f, the winding portion of the torsion coil spring 16 is bent by bending the thin support wall 14e. , 14e. A shutter opening / closing pin 14g is provided upright at the tip of one arm 14b.
g reaches above the holder 12 through the escape hole 12d, and one end of the torsion coil spring 16 is engaged with the shutter opening / closing pin 14g. Further, the other arm 14
A lock claw 14h is formed at the tip of c, and this lock claw 14h can be engaged with and disengaged from the locking claw 11c of the slide plate 11. The other end of the torsion coil spring 16 passes through the retaining projection 12e of the holder 12, and a bent portion 16a formed at the distal end thereof is engaged with the locking hole 12f.

FIG. 22 is a plan view of the head transfer mechanism, and FIG.
Is a sectional view of the head transfer mechanism, FIG. 24 is a plan view of a carriage provided in the head transfer mechanism, FIG. 25 is a rear view of the carriage, FIG. 26 is a rear view of the carriage, and FIG.
FIG. 28 is a sectional view taken along the line AA of FIG. 25, FIG. 28 is an explanatory view showing a state where a follower spring is mounted on the carriage, and FIG.
Is a perspective view showing a head mounting portion of the carriage, FIG. 30 is a cross-sectional view of the mounting state of the carriage and the lower magnetic head viewed from a longitudinal direction, FIG. 33 is a plan view of a hold case provided in the head transfer mechanism, FIG. 33 is a plan view of a main part showing a mounting portion of the hold case and the carriage, and FIG.
It is sectional drawing which follows the B line.

A head transfer mechanism 17 is disposed at the rear of the chassis 10, and as shown in FIGS.
The head transfer mechanism 17 includes a carriage 18 and a hold case 19 hinged above the carriage 18. The carriage 18 and the hold case 19 are both formed of a plastic material, and a lower magnetic head 20 is fixed to an upper surface of the carriage 18 and an upper magnetic head 21 is fixed to a lower surface of the hold case 19, respectively.

As shown in FIGS. 24 to 27, a stepped connecting portion 18a is formed at the rear portion of the carriage 18, and a circular groove 18b, a screw hole 18c, Regulating protrusion 18d, a pair of positioning pins 18
e, a spring receiving portion 18f, an L-shaped spring support portion 18g, and the like are formed. On the back side of the connecting portion 18a, a concave portion 18h having an open lower surface, a pair of support portions 18i opposed via the concave portion 18h, and a guide portion 18j inclined toward the concave portion 18h are formed. The one supporting portion 18i is provided with a screw hole 18k and a positioning pin 18l. The lower surfaces of the two support portions 18i form substantially the same plane, and a follower spring 22 indicated by a two-dot chain line is fixed between the support portions 18i.

At the time of mounting the follower spring 22, as shown in FIG. 28, the follower spring 22 is first dropped from the back side of the connecting portion 18a onto both support portions 18i with the carriage 18 turned upside down. The positioning hole 22a of the follower spring 22 is inserted into the positioning pin 181. Thereafter, the screw 23 is inserted into the through hole 2 of the follower spring 22.
2b is screwed into the screw hole 18k, and the screw 23 is tightened.
8 is fixedly attached to the back surface of the connecting portion 18a. At this time, since the guide portion 18j is formed at the opening end of the concave portion 18h, the follower spring 22 is securely dropped onto both support portions 18i along the guide portion 18j, and the follower spring 22
Can be easily installed.

Returning to FIG. 22 to FIG.
8 has a through hole 18m formed in one side thereof. The through hole 18m is inserted into a guide shaft 24 fixed to the chassis 10, whereby the carriage 18 is guided in the front-rear direction of the chassis 10. I have. An L-shaped arm 18n is formed on the other side of the carriage 18, and the L-shaped arm 18n passes above the screw shaft 25 and is formed by a photo interrupter or the like disposed on the chassis 10. Section 26 has been reached. An engagement projection 18o is engraved on the back surface of the L-shaped arm 18n,
The engaging projection 18o receives the elastic force of the follower spring 22 and stably engages with the screw groove of the screw shaft 25. The screw shaft 25 is a rotation shaft of a stepping motor 27 attached to an upright wall 10 b behind the chassis 10, and the tip of the screw shaft 25 is supported by the support wall 10 h of the chassis 10. Accordingly, when the screw shaft 25 rotates with the stepping motor 27 as a drive source, the rotation of the screw shaft 25 is transmitted to the carriage 18 via the engaging projection 18o, and the carriage 18 is moved in the front-rear direction of the chassis 10, that is, The magnetic disk 8 is moved in the radial direction. At this time, the L-shaped arm 18n
When the tip of the crosses the detection unit 26, a zero track signal is output.

As shown in FIGS. 29 to 31, a mounting base 18p is formed at the center of the distal end of the carriage 18, and the periphery of the mounting base 18p is a recess 18q. An adhesive filling groove 18r extending in the longitudinal direction of the carriage 18 is provided on the upper surface of the mounting table 18p.
An escape groove 18s is formed opposite to the mounting base 18p, and through holes 18t are formed on both sides of the mounting base 18p. One end of the adhesive filling groove 18r has a larger width dimension than other portions. It is a circular wide part. The lower magnetic head 20 is placed on the mounting base 18p thus configured, and the lower magnetic head 20 is mounted on the adhesive filling groove 18r.
Is fixed to the mounting base 18p by an adhesive 28 filled in the mounting base 18p. At this time, the circular wide portion formed at one end of the adhesive filling groove 18r is located outside the lower magnetic head 20, and the adhesive 28 injected from this wide portion fills the adhesive filling groove 18r. Through the lower magnetic head 20 and the mounting base 1
8p. Also, the adhesive filling groove 1
Since 8r extends along the center of the lower surface of the lower magnetic head 20, the lower magnetic head 20 is adhered and fixed to the mounting base 18p with good balance. Further, the lower magnetic head 2
0 has a thin core portion 20a and a thick core portion 20b, but the thin core portion 20a, which has lower rigidity than the thick core portion 20b, straddles the adhesive filling groove 18r and has two escape grooves 18s.
The upper magnetic head 2 is positioned above the adhesive filling groove 18r.
The surplus adhesive 28 flowing out through the lower surface of the groove 0s is stored in the escape grooves 18s. As a result, the contact area between the thin core portion 20a and the mount 18p is reduced, so that the thin core portion 20a is prevented from being damaged by the curing of the adhesive 28.

After the lower magnetic head 20 is fixed to the mounting base 18p with an adhesive 28, if necessary, an adhesive 29 such as a UV resin is applied around the lower magnetic head 20. The head 20 is more securely fixed to the mount 18p (see FIG. 30). The lower magnetic head 20 thus bonded and fixed on the mounting table 18p of the carriage 18 is an FPC (flexible printed circuit board) 30.
The FPC 30 is guided to a printed circuit board, which will be described later, through the recess 18q.

As shown in FIG. 32, a spring receiving portion 19a is formed on the upper surface of the hold case 19, and a first supporting arm 19b and a second supporting arm 19c are formed on both sides thereof so as to protrude. I have. The lower surface of the first support arm 19b is at a lower position than the lower surface of the second support arm 19c. In the case of the present embodiment, the distal end of the first support arm 19b is formed in an L-shape with the tip thereof facing downward. The tip of the first support arm 19b projects downward from the second support arm 19c. A leaf hinge spring 31 made of an elastic metal plate is provided at the rear end of the hold case 19, and the hold case 19 and the leaf hinge spring 31 are integrated by outsert molding. Further, the upper magnetic head 21 is fixed to the tip of the hold case 19 via a gimbal spring.
Are also guided to a printed circuit board to be described later via an FPC (not shown).

The hold case 19 configured as described above
As shown in FIGS. 22 and 23, after the leaf hinge spring 31 and the mounting plate 32 are placed on the connecting portion 18a of the carriage 18 in an overlapping manner, the set screw 33 is screwed from above into the screw hole of the connecting portion 18a. By being screwed into 18c, it is hinged on the connecting portion 18a of the carriage 18. At this time, as shown in FIG. 26, one side edge of the leaf hinge spring 31 is placed on the connecting portion 18a while being inserted into a slit-like holding portion 18u formed at the base of the spring supporting portion 18g of the carriage 18. Accordingly, one side edge of the leaf hinge spring 31 near the guide shaft 24 is pressed by the pressing portion 18u. In this state, the hold case 19 is slightly rotated against the tightening force of the set screw 33 to adjust the alignment between the lower magnetic head 20 and the upper magnetic head 21, and then the adhesive 34 is inserted into the circular groove 18b of the carriage 18. , The leaf hinge spring 31 is temporarily fixed to the connecting portion 18a. In this case, as shown in FIGS. 33 and 34, the leaf hinge spring 31 is placed on the connecting portion 18a so as to cover almost half of the circular groove 18b.
The adhesive 34 can be easily filled between the carriage 18 and the leaf hinge spring 31 from the exposed portion of the circular groove 18b. Also, the mounting plate 32 of the leaf hinge spring 31
Since the notch 32a is formed in the excess adhesive 3
4 is stored in the notch 32a to prevent the adhesive 34 from undesirably protruding. After the temporary fixing is completed, the set screw 33 is firmly tightened to be permanently fixed. In this case, since the leaf hinge spring 31 is temporarily fixed to the connecting portion 18a by the adhesive 34, the lower magnetic head 31 is fixed. 2
The alignment between 0 and the upper magnetic head 21 is maintained.

The mounting plate 32 is formed by pressing a flat metal plate, and burrs are generated on one surface of the mounting plate 32 during the pressing. The height of the burrs is not uniform, and if the mounting plate 32 is placed on the connecting portion 18a of the carriage 18 with the surface on which the burrs are generated facing the rear, the tightening force of the set screw 33 is reduced by the leaf hinge spring. It does not act uniformly on 31. Therefore, in this embodiment,
As shown in FIG. 22, a cut-off portion 32c is formed at one corner of the mounting plate 32, and the regulating protrusion 18d of the carriage 18 is located in the cut-off portion 32c.
The mounting plate 32 has directionality. Therefore, when the mounting plate 32 is placed on the connecting portion 18a of the carriage 18, the burrs always face upward, so that the mounting plate 32 cannot be assembled into the carriage 18 with the mounting plate 32 turned upside down.

Returning to FIG. 22, the winding portion of the load spring 35 is inserted into the spring supporting portion 18g of the carriage 18, and both free ends of the load spring 35 are hooked on the spring receiving portions 18f and 19a, respectively. By stopping, the hold case 19 is elastically biased toward the carriage 18. The load spring 35 is formed of a torsion coil spring, and the lengths l1 and l2 from the winding portion to both free ends are set to be substantially equal. For this reason, when the load spring 35 is incorporated, it is not necessary to worry about the direction, and the workability is improved. The hold case 19 is located in the elongated hole 12c of the holder 12, and among the two support arms 19b and 19c provided in the hold case 19, the first support arm 19b is a spring of the load spring 35. The second support arm 19 abuts against the bulging portion 12 b of the holder 12 under the force.
A predetermined clearance is secured between c and the bulging portion 12b. At this time, since the second support arm 19c is formed at a position far from the leaf hinge spring 31 with respect to the first support arm 19b, a clearance required between the second support arm 19c and the bulging portion 12b is secured. The second support arm 19
The thickness dimension of c can be made as large as possible. Further, the first support arm 19b abuts on the bulging portion 12b of the holder 12 almost directly above the guide shaft 24, and the head transfer mechanism 17 is elastically supported by the follower spring 22 at a position away from the guide shaft 24. Therefore, even if the follower spring 22 having a small spring force is used, it is possible to prevent the head transfer mechanism 17 including the carriage 18 from rising.

FIG. 35 is a view of the chassis viewed from the rear side. As shown in FIG. 35, a sub-chassis 36 and the above-described printed circuit board 37 are fixed to the lower surface of the chassis 10. A spindle motor 38 is mounted on the sub-chassis 36.
(See FIG. 9), and the spindle motor 38 is electrically connected to the printed board 37 via a control board or an FPC. Circuit elements including drive circuit elements such as the stepping motor 27 and the spindle motor 38 are mounted on the printed circuit board 37. As shown in FIG.
40 are attached. These connectors 39, 40 are male connectors having a plurality of connection pins 39a, 40a. By inserting a female connector 41 of an external device shown by a two-dot chain line into these connectors 39, 40, the magnetic recording / reproducing apparatus can be connected to the external device. Is to be connected to.

36 is a plan view of the upper cover, FIG. 37 is a rear view of the upper cover, FIG. 38 is a side view of the upper cover, FIG. 39 is a plan view of the lower cover, and FIG. FIG. 41 is a side view of the lower cover.

As shown in FIGS. 36 to 38, the upper cover 1 has a flat top surface 2a, a pair of side surfaces 1b hanging from both side edges of the top surface 1a, and a back surface hanging down from the rear end of the top surface 1a. 1c, and the side surface 1b and the back surface 1c
It is bent at a right angle to a. A through hole 1d is formed in the back surface 1c, two L-shaped legs 1e are formed at the lower end of one side surface 1b, and L-shaped legs are formed at the lower end of the other side surface 1b.
One leg piece 1e and one square hanging piece 1f are formed. The formation positions of the leg pieces 1e and the hanging pieces 1f are shifted from each other in the front-rear direction of the upper cover 1. Therefore, when a large number of the upper covers 1 are removed from the base material of the flat metal plate, any upper cover 1 is formed. Is positioned between the two leg pieces 1e formed on another upper cover 1 or between the leg piece 1e and the hanging piece 1f.
Scrap generated from the base material can be reduced as much as possible.

As shown in FIGS. 39 to 41, the lower cover 2 has a flat bottom surface 2a, a pair of side surfaces 2b rising from both side edges of the bottom surface 2a, and a back surface 2c rising from the rear end of the bottom surface 2a. The side surface 2b and the back surface 2c are
It is bent at a right angle to a. Lower cover 2
The depth dimension of the bottom surface 2a is set larger than the depth dimension of the top surface 2a of the upper cover 1, and the material and the weight of the upper cover 1 are reduced by the short dimension. The height of the back surface 2c is set to be sufficiently small with respect to each side surface 2b, and a pair of regulating walls 2d protrude from the upper end of the back surface 2c. Two locking pieces 2e are formed on one side face 2b, and one locking piece 2e and a bent piece 2g having a through hole 2f are formed on the other side face 2b. These locking pieces 2e are formed by bending substantially perpendicularly inward of the side surfaces 2b along a vertical line. In addition, each side surface 2b has a support piece 2h and a stop piece 2i facing each other through an opening.
Are formed on each of the left and right sides, with two sets on each side. The support piece 2h and the stop piece 2i in each set are vertically displaced, and the lower end of the stop piece 2i is inclined upward. The stop piece 2i is in a pressed state, but the support piece 2h is bent at a substantially right angle inward of the side surface 2b along a vertical line after the press-out.

After the mechanism body is fixed to the lower cover 2 configured as described above, the upper cover 1 is put on the lower cover 2 and the two are joined and integrated with each other, as described above. Then, the housing of the magnetic recording / reproducing device is formed. In this case, as shown in FIG. 42, first, the chassis 10 of the assembled mechanism body is inserted into the inside of the lower cover 2 and placed on each support piece 2h, and then each stop piece 2i.
Is bent inward at a substantially right angle to the side surface 2b, and the chassis 10 is clamped between the sets of the stopper pieces 2i and the support pieces 2h. FIG.
8 show this state. As is clear from these figures, the regulating wall 2d of the lower cover 2 is located beside the connectors 39 and 40 mounted on the printed circuit board 37.

Next, as shown in FIG. 43 (a), both sides 1b of the upper cover 1 are inserted inside the both sides 2b of the lower cover 2, and the upper cover 1 is moved toward the rear end of the lower cover 2 (in the direction of the arrow). 43), the corresponding locking pieces 2e of the lower cover 2 enter between the lower end of the side surface 1b of the upper cover 1 and the tip of each leg 1e, as shown in FIG. Are coupled to the lower cover 2. In this case, since the leg piece 1e and the locking piece 2e locked thereon are obtained by pressing the base material of the upper cover 1 and the lower cover 2, high dimensional accuracy is ensured. Regardless of the bending angle of each locking piece 2e, each leg 1e is
e is securely locked. Further, since the opening formed when the locking piece 2e is pressed out is closed by the leg piece 1e, dust prevention and magnetic shielding are achieved. Thereafter, as shown in FIG. 44, the screws 42 are connected to the upper cover 1 and the lower cover 2.
Through the through holes 1d and 2f of the
When screwed into j, the mechanism body including the chassis 10 and the lower cover 2 and the upper cover 1 are joined and integrated with each other.

FIGS. 1 to 4 show this state.
As is apparent from these figures, most of the mechanism body is covered by the upper and lower covers 1 and 2, but the connectors 39 and 40 mounted on the printed board 37 and the stepping mounted on the upright wall 10b of the chassis 10. The motor 26 is exposed outward from the rear end of the upper cover 1 and is located at an open portion above the rear end of the lower cover 2. Also,
As described above, the two regulating walls 2 d formed on the back surface 2 c of the lower cover 2 are located on the sides of the connectors 39 and 40.
Therefore, when the female connector 41 of the external device is inserted into these connectors 39 and 40, the female connector 41
The displacement in the horizontal direction is regulated by d, and the female connector 41 can be easily inserted into the connectors 39 and 40. Further, when it becomes necessary to adjust the mounting position of the stepping motor 26, this adjustment operation can be performed using a large space above the stepping motor 26.

The magnetic recording / reproducing apparatus according to the present embodiment is configured as described above. Next, the operation thereof will be described.

When the disc cartridge 6 is not mounted, the rotating member 14 is elastically urged by the torsion coil spring 16 and is at the position shown in FIG.
4h is engaged with the locking claw 11c of the slide plate 11, whereby the slide plate 11 is maintained at the retracted position. In this case, as shown in FIG.
Is locked at the upper end of each cam groove 11e of the slide plate 11,
Holder 12 is kept in the raised position.

When the disk cartridge 6 is inserted into the front plate 3 through the insertion opening 3a, the disk cartridge 6
The door 5 is rotated by this, but excessive rotation of the door 5 is restricted by contact with the stopper projection 12g of the holder 12. Insert the disk cartridge 6 further,
When it passes between the upper surface of the holder 12 and the support piece 12a and abuts against the shutter opening / closing pin 14g of the rotating member 14, the bent portion 16a of the torsion coil spring 16 is erroneously inserted in the middle of the insertion. The escape portion 7a allows the escape to the outside.
If the disc cartridge 6 is inserted upside down by mistake, the tip of the cartridge case 7 may be bent.
Therefore, the disc cartridge 6 cannot be inserted any more because it comes into contact with a.

Further, when the disk cartridge 6 is inserted into the inside, the rotating member 14 rotates clockwise in FIG. 6 against the elastic force of the torsion coil spring 16 as shown in FIG. The leading end of the cartridge 6 enters between the carriage 18 of the head transfer mechanism 17 and the hold case 19. With the rotation of the rotating member 14, the shutter opening / closing pin 14g is inserted into the through hole 12d of the holder 12.
The shutter 9 is moved by the shutter opening / closing pin 14g so as to rotate inside, and the magnetic disk 8 in the cartridge case 7 is exposed from the opening 7b and the window hole 9a. Also,
With the rotation of the rotation member 14, the locking between the lock claw 14h and the locking claw 11c is released, so that the slide plate 11 is moved to the forward position by the tension spring 13 and fixed to the mounting plate 11c of the slide plate 11. The eject button 4 protrudes from the front panel 3. As a result, as shown in FIG.
Each projection 12h of the holder 12 moves to the lower end of each cam groove 11e of the slide plate 11, and the holder 12 moves together with the disk cartridge 6 to a lowered position, that is, a loading position. Since the first support arm 19b is in contact with the bulging portion 12b of the holder 12, the hold case 19 urged by the load spring 35 also moves down with the lowering of the holder 12, and the lower side of the carriage 18 side Magnetic head 20
And the upper magnetic head 21 on the side of the hold case 19 contacts the magnetic disk 8. Here, only the first support arm 19b comes into contact with the bulging portion 12b of the holder 12, and the reaction force acts as a torsional moment on the leaf hinge spring 31, but as described above, the leaf hinge spring 31 is pressed by the pressing portion 18u of the carriage 18, the leaf hinge spring 31
Deformation is prevented. If a large external force is applied due to a fall or the like, the second support arm 19c of the hold case 19 abuts against the bulging portion 12b of the holder 12, and the hold case 19 does not excessively tilt toward the carriage 18. The two magnetic heads 20 and 21 are not damaged by collision.

After the disk cartridge 6 has been moved to the loading position in this way, when the stepping motor 27 is driven to rotate the screw shaft 25, the rotation of the screw shaft 25 causes the rotation of the screw groove and the engagement projection 18o. The light is transmitted to the carriage 18 via the engagement portion, and the head transfer mechanism 17 moves in the radial direction of the magnetic disk 8 along the guide shaft 24. Further, by driving the spindle motor 38, the magnetic disk 8
Rotates, and the lower magnetic head 2
0 and the upper magnetic head 21 record / reproduce information.

When ejecting the disc cartridge 6 at the loading position, the eject button 4 protruding from the front plate 3 is pressed, and the slide plate 11 is moved to the retracted position against the elastic force of the tension spring 13. . Then
The holder 12 rises from the loading position of FIG. 46 to the unloading position of FIG. 45, and the disk cartridge 6 is moved from the insertion opening 3a of the front plate 3 by the rotating member 14 that rotates in the counterclockwise direction of FIG. At the same time, the slide claw 14h of the rotating member 14 is locked by the locking claw 11c of the slide plate 11, so that the slide plate 11 is again maintained at the retracted position.

[0046]

The present invention is embodied in the form described above and has the following effects.

In the unloading state in which the holder is raised, the hold case is lifted by contacting only the first support arm extending toward the guide shaft with the top surface of the holder. Not only can the carriage be reliably prevented from lifting, but even if the hold case receives a large force from the outside due to a fall or the like, the hold case will be no more when the second support arm strikes the holder. The second support arm is not inclined in the carriage direction, and the second support arm is formed at a position farther from the hinge connection portion of the hold case than the first support arm, and is required between the second support arm and the top surface of the holder. Since the thickness dimension of the second support arm can be made as large as possible after securing the clearance, The damage of the gas head and the lower magnetic head can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of the magnetic recording / reproducing apparatus.

FIG. 3 is a rear view of the magnetic recording / reproducing apparatus.

FIG. 4 is a side view of the magnetic recording / reproducing apparatus.

FIG. 5 is a plan view of the disk cartridge.

FIG. 6 is a plan view showing an upper cover removed from FIG. 1;

FIG. 7 is a rear view thereof.

FIG. 8 is a side view thereof.

FIG. 9 is a plan view showing a state where a holder is removed from FIG. 6;

FIG. 10 is a plan view of a chassis provided in the magnetic recording / reproducing apparatus.

FIG. 11 is a side view of the chassis.

FIG. 12 is a perspective view showing guide protrusions and protrusions of the chassis.

FIG. 13 is a plan view of a slide plate provided in the magnetic recording / reproducing apparatus.

FIG. 14 is a rear view of the slide plate.

FIG. 15 is a side view of the slide plate.

FIG. 16 is a sectional view showing an engagement state between the slide plate and a chassis.

FIG. 17 is a plan view of a holder provided in the magnetic recording / reproducing apparatus.

FIG. 18 is a rear view of the holder.

FIG. 19 is a side view of the holder.

FIG. 20 is an explanatory view showing a state where the outer shape of the holder is removed from the base material.

FIG. 21 is a perspective view showing a main part of a shutter opening / closing mechanism provided in the magnetic recording / reproducing apparatus.

FIG. 22 is a plan view of a head transfer mechanism provided in the magnetic recording / reproducing apparatus.

FIG. 23 is a sectional view of the head transfer mechanism.

FIG. 24 is a plan view of a carriage provided in the head transfer mechanism.

FIG. 25 is a rear view of the carriage.

FIG. 26 is a rear view of the carriage.

FIG. 27 is a sectional view taken along line AA of FIG. 25.

FIG. 28 is an explanatory diagram showing a state in which a follower spring is mounted on the carriage.

FIG. 29 is a perspective view showing a head mounting portion of the carriage.

FIG. 30 is a cross-sectional view of the mounting state of the carriage and the lower magnetic head as viewed from the longitudinal direction.

FIG. 31 is a cross-sectional view as viewed from the lateral direction.

FIG. 32 is a plan view of a hold case provided in the head transfer mechanism.

FIG. 33 is a plan view of relevant parts showing a mounting portion of the hold case and the carriage.

34 is a sectional view taken along line BB of FIG.

FIG. 35 is a view of the chassis of FIG. 10 as viewed from the back side.

FIG. 36 is a plan view of an upper cover provided in the magnetic recording / reproducing apparatus.

FIG. 37 is a rear view of the upper cover.

FIG. 38 is a side view of the upper cover.

FIG. 39 is a plan view of a lower cover provided in the magnetic recording / reproducing device.

FIG. 40 is a rear view of the lower cover.

FIG. 41 is a side view of the lower cover.

FIG. 42 is an explanatory view showing a fixed relationship between the lower cover and a chassis.

FIG. 43 is an explanatory view showing an assembling step of the upper cover and the lower cover.

FIG. 44 is a fragmentary cross-sectional view showing fixed portions of the upper cover, the lower cover, and the chassis.

FIG. 45 is an explanatory diagram showing the relationship between the holder and the slide plate during unloading.

FIG. 46 is an explanatory diagram showing the relationship between the holder and the slide plate during loading.

FIG. 47 is a plan view showing the loading state of FIG. 6;

FIG. 48 is a plan view of a conventional head transfer mechanism.

FIG. 49 is a sectional view of the head transfer mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper cover 1e Leg piece 2 Lower cover 2e Locking piece 2h Supporting piece 2i Stopping piece 5 Door 6 Disk cartridge 7 Cartridge case 7a Mis-insertion prevention part 8 Magnetic disk 9 Shutter 10 Chassis 10d Guide projection 10e Projection 11 Slide plate 11c Stop claw 11d Guide hole 11e Cam groove 12 Holder 12c Long hole 12f Locking hole 12g Stopper protruding piece 12h Projection 13 Tension spring 14 Rotating member 14a Shaft 14b, 14c Arm 14d, 14e Support wall 14f Slit 14g Shutter opening / closing pin 14h Lock claw 16 Torsion coil spring 16a Bending portion 17 Head transfer mechanism 18 Carriage 18a Connecting portion 18b Circular groove 18c, 18k Screw hole 18d Restriction projection 18e, 18l Positioning pin 18f Spring receiving portion 18g Spring support portion 18h Recess 1 8i Support part 18j Guide part 18o Engagement convex part 18p Mounting stand 18q Depressed part 18r Adhesive filling groove 18s Escape groove 18u Holding part 19 Hold case 19a Spring receiving part 19b First support arm 19c Second support arm 20 Lower magnetic head Reference Signs List 20a Thin core portion 20b Thick core portion 21 Upper magnetic head 22 Follower spring 23 Screw 24 Guide shaft 25 Screw shaft 27 Stepping motor 28 Adhesive 31 Leaf hinge spring 32 Mounting plate 32a Notch 32c Cut-off portion 33 Stop screw 34 Adhesive 35 Load spring 37 Printed circuit board 39, 40 Connector 41 Female connector 42 Screw

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 21/02 G11B 21/12

Claims (1)

(57) [Claims] 1. A screw shaft rotating by a motor as a drive source, a guide shaft disposed parallel to the screw shaft, and slidably fitted on the guide shaft, and a lower magnetic head at a distal end portion. An attached carriage, a follower spring that presses an engaging projection provided on the carriage to a screw groove of the screw shaft, an upper magnetic head attached to a tip end, and a leaf hinge spring at a rear end of the carriage. And a load spring hung between the hold case and the carriage and biasing the upper magnetic head toward the lower magnetic head, both sides of the hold case. A first support arm extending in the direction of the guide shaft and a second support extending in the direction of the screw shaft And the first support arm is brought into contact with the top surface of a holder that moves up and down between an unloading position and a loading position, and the second support arm is held more than the first support arm. A head transfer mechanism for a magnetic recording / reproducing apparatus, wherein the head is formed at a position distant from a hinge connection portion of a case, and the second support arm is opposed to a top surface of the holder at a predetermined interval .