JPH0368464B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a double-sided flexible disk device, and more particularly to a double-sided flexible disk device equipped with a magnetic head support device that supports a magnetic head slider for recording and reproducing information. It is related to.

[Conventional technology]

FIG. 5 is a side sectional view showing a conventional magnetic head support device for a double-sided flexible disk disclosed in, for example, Japanese Unexamined Patent Publication No. 58-15866. , a first head slider glued and fixed to one end of a carriage movable in the radial direction of the flexible disk 2; 4 an arm rotatably attached to the proximal end of the carriage 1 via a leaf spring 5; is the second one attached to the arm 4 via the gimbal spring 7.
This is a head slider.

The base end of the leaf spring 5 integrally molded on the arm 4 is attached to the presser plate 1 by a subframe 8 and screws 9.
0 to the carriage 1, and the arm 4 is rotatable about the base end of the leaf spring 5 as a fulcrum. Reference numeral 11 denotes a torsion spring installed at one end of the subframe 8, which urges the arm 4 toward the first head slider 3 side.

A second head slider 6 is attached to the degree of freedom of the arm 4 facing the first head slider 3. Near the free end of arm 4 there is a control knob (not shown) which engages a head load magnet actuating member (not shown) and which, upon insertion of flexible disk 2 into the magnetic head support device, FIG. As shown in the figure, the arm 4 is automatically rotated and the second head slider 6 is moved to
The flexible disk 2 can be inserted.

The first head slider 3 is composed of a head core for recording and reproducing information, an erase core, and a base made of ceramic.The portion that contacts the flexible disk 2 is flat, and has an annular rim 3a around this. Flat and annular rim 3
A and A are connected to each other by a smooth curved surface so that the flexible disk 2 is not damaged during rotating recording and reproducing operations.

The second head slider 6 is composed of a head core for recording and reproducing the same as the first head slider 3, an erase core, and a base made of ceramic, but its shape is rectangular, and the part that contacts the flexible disk 2 is flat. Finished in
It has a groove in the center to prevent lifting. Further, the second head slider 6 is bonded and fixed to a thin gimbal spring 7, and both ends of the gimbal spring 7 are bonded and fixed to the arm 4. The gimbal spring 7 has a degree of freedom to easily bend in all directions, and has a highly elastic spring structure.

A tapered pivot 4a is provided on the back surface of the gimbal spring 7, and the tip of this pivot 4a is connected to the second
The second head slider 6
The head slider 6 swings in the circumferential direction and radial direction of the flexible disk 2, centering on the tip of the pivot 4a.

The head core portions of the first and second head sliders 3 and 16 are located at positions distributed outward and inward in the radial direction of the flexible disk 2 from the center of both sliders 3 and 6. is located inside the radius of the flexible disk 2.

Next, the operation of the double-sided flexible disk device having the above structure will be explained. As shown in FIG. 6, when the flexible disk 2 is not attached to the magnetic head support device, the arm 4 is lifted by a head load magnet actuating member (not shown). When recording or reproducing information, as shown in FIG. 5, the flexible disk 2 is attached to the magnetic head support device, the head load magnet operating member is released, and the arm 4 is moved around the flexible disk by the spring force of the torsion spring 11. Pushed to the 2nd side. The second head slider 6 presses the first head slider 3 via the flexible disk 2. This pressing force is determined by the elastic force of the torsion spring 11 since the pivot 4a directly presses the center of the second head slider 6 as a load point.

The surface of the flexible disk 2 vibrates up and down with a vibration waveform due to natural undulations. In contrast, the first head slider 3 is fixed to the carriage 1, and is arranged so that the sliding surface of the first head slider 3 against the flexible disk 2 bites into the nominal running surface of the flexible disk 2. As a result, the undulation of the flexible disk 2 is corrected, and the flexible disk 2 follows the surface of the first head slider 3. On the other hand, while the second head slider 6 is closely sliding on the surface of the flexible disk 2, the pivot 4a is used as a load point, and the second head slider 6 is pressed toward the first head slider 3 via the flexible disk 2, and is pressed against the spring. Supported by the planar position holding function of the gimbal spring 7, which has a small constant, it exhibits a following motion for the surface of the flexible disk 2 that has been corrected by the surface of the first head slider 3.

The loading process from the open state of the arm 4 shown in FIG. 6 to the information recording and reproducing state shown in FIG. 5, and the so-called tapping process during the unloading process from the recording and reproducing state to the open state of the arm 4 During the loading process, the arm 4 is released from the active member of the head load magnet,
The first head slider 3 and the second head slider 6 collide with each other via the flexible disk 2 as they descend due to the elastic force of the torsion spring 11 . During the unloading process, the head load magnet actuating member causes the arm 4 to rotate upward, and the second head slider 6 rises as the arm 4 rotates. A transient overshoot occurs during this upward rotation of the arm 4, and the movement continues in the second head slider 6 attached to the gimbal spring 7 with a small spring constant, causing the arm 4 to return to the open position. Even if this happens, only the second head slider 6 may come into contact with the first head slider 3 again via the flexible disk 2 following the transient phenomenon.

[Problem that the invention seeks to solve]

Since the conventional double-sided flexible disk device is constructed as described above, any gentle large waviness of the flexible disk 2 during recording or playback is corrected by the first head slider 3, and Since the second head slider 6 follows the corrected surface of the flexible disk 2, a good contact condition can be obtained. however,
In this case, the first head slider 3 alone cannot correct the steep small waviness (both large in frequency and amplitude) of the flexible disk 2, and the second head slider 6 is sufficient to correct it. Since it is necessary to press the flexible disk 2, the pressing force of the second head slider 6 against the flexible disk 2 increases, resulting in a problem that the sliding life of the flexible disk 2 is impaired.

Furthermore, since the head core portion of the second head slider 6 is located inside the core portion of the first head slider 3, the recording density of the flexible disk 2 is higher on the surface facing the second head slider 6. In particular, the second head slider 6 side is disadvantageous in terms of error rate characteristics closer to the inner circumference. Furthermore, in the configuration in which the second head slider 6 follows the two surfaces of the flexible disk corrected by the first head slider 3, the second head slider 6 supported by the gimbal spring 7 with a small spring constant is Because it is too sensitive to the wave motion of the flexible disk 2, compared to the first head slider 6,
There were also problems in that the state of contact with the flexible disk 2 was poor, and furthermore, the error rate characteristics were disadvantageous.

Furthermore, during tapping, the first,
When the second head sliders 3 and 6 collide, the impact force is applied to the flexible disk 2, damaging the flexible disk 2, and causing damage to the flexible disk 2 of the second head slider 6 during the unloading process. There was also the problem that contact with the metal could cause damage as well.

This invention was made in order to solve the above-mentioned problems, and can greatly reduce damage to the flexible disk during sliding commands and tapping of the flexible disk. The object of the present invention is to obtain a double-sided flexible disk device that can improve the recording and reproducing characteristics of a head slider.

[Means for solving problems]

In the double-sided flexible disk device according to the present invention, both the first head slider attached to the carriage and the second head slider whose rotation toward the flexible disk is restricted by a stopper have degrees of freedom in all directions. The elastic modulus of the second elastic support of the second head slider is set to be larger than the elastic modulus of the first elastic support of the first head slider. .

[Effect]

In this invention, the first and second head sliders follow the flexible disk during recording and reproduction with a small pressing force, and the impact force of the first and second head sliders on the flexible disk during tapping is relaxed. be done.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show one embodiment of the invention, and the same or corresponding parts as in FIGS. 5 and 6 are given the same reference numerals, and the explanation thereof will be omitted. 8a
is a stopper formed at the free end of the subframe 8, which stops the arm 4 from rotating toward the flexible disk 2 due to the elastic force of the torsion spring 11, and determines the position of the arm 4 during recording and reproduction. It is. 21 is a first gimbal spring as a first elastic support attached to the tip of the carriage 1; 22 is bonded to this first gimbal spring 21;
The first head slider is fixed.

The first gimbal spring 21 as shown in FIG.
has a triple annular spring structure whose both ends 21a and 21b are glued and fixed to the carriage 1 and has degrees of freedom to easily bend in all directions (perpendicular to the flexible disk 2, circumferential direction, and radial direction). It's summery. The first head slider 22 is composed of a head core 22a for recording and reproducing information, an erase core, and a base 22c made of ceramic. 22b
is formed, and a flexible disk 2 is formed at the corner.
Chamfered and smooth surfaces are applied to prevent scratches.

23 is a second unit attached to the tip of arm 4;
a second gimbal spring as a resilient support of 24;
is a second head slider that is bonded and fixed to this second gimbal spring 23.

The second gimbal spring 23 as shown in FIG.
, both ends 23a and 23b are glued and fixed to the arm 4, and the flexible disk 2
It is a double annular spring structure that has degrees of freedom to easily deflect in vertical, circumferential, and radial directions, and the spring constant in each direction is equal to the spring constant in each direction of the first gimbal spring 21. It's getting bigger than. The second head slider 24 has the same shape as the first head slider 22, and is composed of a head core 24a for recording and reproducing information, an erase core, and a base 24c made of ceramic. Also,
A second head slider 24 facing the first head slider 22 via the flexible disk 2
The head core 24a of the first head slider 2
The flexible disk 2 is located inside the second head core 22a in the radial direction of the flexible disk 2.

Next, the operation of the double-sided flexible disk device having the above configuration will be explained. When the flexible disk 2 is not attached to the magnetic head support device, the arm 4 is lifted by a head load magnet actuating member (not shown), as shown in FIG. When recording and reproducing information, use the flexible disk 2 as shown in Figure 1.
is attached to the magnetic head support device, the head load magnet actuating member is released, and the arm 4 is pushed toward the flexible disk 2 by the elastic force of the torsion spring 11. The second head slider 24 presses against the first head slider 22 via the flexible disk 2.

The elastic force of the torsion spring 11 is applied to the second head slider 24 via the flexible disk 2.
The pressure is set to be sufficiently larger (for example, about 40gr) than the pushing force from the head slider 22 of the second head slider 22.
The head slider 24 is formed by the torsion spring 11 and the stopper 8a formed on the subframe 8.
A fixed position is maintained during recording and playback. At this time, the flexible disks 2 of the first and second head sliders 24 and 26 are caused by the respective deflections of the first gimbal spring 21 of the first head slider 22 and the second gimbal spring 23 of the second head slider 24. The pushing force against is about 12gr. Furthermore, although the amount of deflection of the first gimbal spring 21 and the second gimbal spring 23 in the direction perpendicular to the flexible disk 2 surface is different, the first and second head sliders 24 and 26 are pressed against each other and are equally uniform. It comes to rest at the point where the impulse is balanced. The amount of deflection is determined by the amount of deflection of the first head slider 22.
The gimbal spring 21 of the second head slider 24 is larger than the second gimbal spring 23 of the second head slider 24.

When the flexible disk 2 rotates at the balance point of the first and second head sliders 22 and 24,
The surface of the flexible disk 2 vibrates up and down due to vibration waves caused by natural waviness. then,
Since the spring constant of the second gimbal spring 23 of the second head slider 24 is larger than that of the first gimbal spring 21, large waviness of the flexible disk 2 is corrected by the second head slider 24.
The flexible disk 2 follows the surface of the second head slider 24. In response to small waviness of the flexible disk 2, the second gimbal spring 33 moves slightly up and down and bends in the circumferential direction and radial direction of the flexible disk 2.
The surface of the head slider 24 follows the flexible disk 2 to maintain good contact.

On the other hand, while the first head slider 22 is closely sliding on the surface of the flexible disk 2,
The moment received from the vertical movement and rotation following movement of the second head slider 24 is applied to the first head slider with a small spring constant.
Supported by the planar position holding function of the gimbal spring 21, the flexible disk 2 performs a follow-up operation on the surface of the flexible disk 2.

The loading process from the arm 4 open state shown in FIG. 2 to the information recording and reproduction state shown in FIG. 1, and the so-called tapping process of the unloading process from the recording and reproduction state to the arm 4 open state. In the process of loading, the arm 4 is released from the head load magnet actuating member and lowered by the elastic force of the torsion spring 11, and the first head slider 22 and the second head slider 24 move toward the flexible disk 2. Collision through. At this time, the first and second gimbal springs 21 and 22 of both the sliders 22 and 24 bend with respect to each other, so that the impact at the time of the collision is alleviated. Furthermore, since the rotation of the arm 4 is restricted by the stopper 8a of the subframe 8, excessive force is not applied to both the sliders 22, 24 and the flexible disk 2. During the unloading process, the head load magnet actuating member causes the arm 4 to rotate upward, and the second head slider 24 rises as the arm 4 rotates.

In the above embodiment, the first gimbal spring 21 of the second head slider 22 has a triple annular structure made of a thin plate spring, and the second gimbal spring 23 of the second head slider 24 has the same structure. Although the double ring structure is made of thin leaf springs, the shapes of both gimbal springs 21 and 23 are exactly the same, and the thickness or material of the spring material is changed.
A difference in spring constant may be set. Further, it is sufficient that the shape has a degree of freedom in all directions, and the same effects as those of the above embodiments can be achieved.

Also, a stopper 8 formed on the subframe 8
a, the arm 44 is held at a fixed position during recording and playback, but even without the subframe 8, the stopper 8a can be attached to a position on the carriage 1 where it will not interfere with the insertion/removal and rotation of the flexible disk 2. Bye.

〔Effect of the invention〕

As described above, according to the present invention, both the first head slider attached to the carriage and the second head slider whose rotation toward the flexible disk is restricted by the stopper have degrees of freedom in all directions. Since the elastic modulus of the elastic support of the second head slider is set to be larger than that of the elastic support of the first head slider, information recording,
Even if the pressing force of the first and second head sliders against the flexible disk during regeneration is small, good follow-up characteristics can be obtained, and the sliding life of the flexible disk can be significantly extended. Further, the impact force of the first and second head sliders on the flexible disk during tapping is alleviated, and damage to the flexible disk is greatly reduced. Furthermore, since the flexible disk follows the second head slider located on the inner circumferential side where the recording density is high, there is also the effect that the error rate characteristics of recording and reproduction of the second head slider are improved.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, FIG. 1 is a side sectional view of a magnetic head support device, and FIG. 2 is a side sectional view showing another mode of use of the device shown in FIG. 1. , FIG. 3 is an overall perspective view of the first gimbal spring, and FIG. 4 is an overall perspective view of the second gimbal spring. 5 and 6 show an example of a conventional magnetic head support device, with FIG. 5 being a side sectional view and FIG. 6 being a side sectional view showing another mode of use of the device shown in FIG. 1...Carriage, 2...Flexible disk, 4...Arm, 11...Torsion spring, 21...
...first gimbal spring (first elastic support), 2
2...First head slider, 23...Second gimbal spring (second elastic support), 24...Second
head slider. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A carriage movable in the radial direction of a flexible disk, an arm rotatably supported at the rear of the carriage, an arm attached to an end of the carriage and perpendicular to the flexible disk, A first elastic support member having degrees of freedom in the circumferential and radial directions; and a back surface of the flexible disk attached to the first elastic support member is pressed by the elastic force of the first elastic support member to provide information. a first head slider for recording and reproducing information; a first head slider attached to the end of the arm and having degrees of freedom in vertical, circumferential and radial directions with respect to the flexible disk; a second elastic support with a large diameter, and a second elastic support that is attached to the second elastic support and presses the surface of the flexible disk with the elastic force of the second elastic support to record and reproduce information. head slider and
A double-sided flexible disk device comprising a stopper that prevents the arm from rotating toward the flexible disk and holds the arm at a predetermined position during recording and playback. 2. The first elastic support and the second elastic support are each a gimbal spring.
Double-sided flexible disk device as described in .