JPH054743B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a floppy disk device, and more particularly to a head vibration isolation structure for a floppy disk device that enables stable reading and writing of information to a disk medium.

Prior Art and Problems The head assembly structure of a conventional floppy disk device is shown in FIGS. 1 and 2. Figure 1 is a front view;
FIG. 2 is a plan view. In FIG. 1, 1 is a lower head and 2 is an upper head. Lower head 1
is supported by a head support plate 3 via a gimbal 4. The upper head 2 is supported by a head arm 5 via a gimbal 6, and the head arm 5 is connected to a head support plate 3 via a leaf spring 7. 8 and 9 are shield plates. Head 1 and Head 2
reads and writes information to and from the disk medium while holding the disk medium between them.

However, in floppy disk devices with such a head assembly structure, abnormal vibrations (abnormal noise) of 1000 Hz or less occur between the media and the head due to changes in the media surface condition (surface deterioration) due to long-term use. However, there was a problem that not only read errors occurred but also medium peeling occurred.

Purpose of the invention The present invention is intended to solve the above-mentioned problems.
The object of the present invention is to provide a head vibration isolation structure for a floppy disk device that enables stable reading and writing of information to a medium.

Structure of the Invention In order to achieve the above object, the present invention prevents head vibrations of 1000 Hz or less by attaching a dynamic vibration absorber with a high damping effect to the head arm that supports the movable head.

That is, the present invention comprises a first head 1 provided on a head support plate 3, a head arm 5 connected to the head support plate 3 via a leaf spring 7, and a second head provided on the head arm 5. In the floppy disk device comprising a head 2, a disk medium is sandwiched between the first head 1 and the second head 2, and information is read from and written to the disk medium. A dynamic vibration absorber 11 containing a viscous liquid 13 and a weight 14 is attached to the head to absorb vibrations of 1000 Hz or less, and is configured as a head vibration isolation structure for a floppy disk device.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3 to 5.

FIG. 3 is a front view showing a head assembly structure to which the present invention is applied, and FIG. 4 is a plan view thereof, in which members having the same structure as in the conventional example are given the same reference numerals as in the conventional example.

In the figure, reference numeral 11 denotes a dynamic vibration absorber (viscous damper) with a high damping effect, which is attached to the upper head 2 of the shield plate 9.
It is installed in a position opposite to the

The dynamic vibration absorber 11, as shown in detail in FIG.
For example, silicone oil 13 with a viscosity of 500 to 1000 cst is placed as a viscous liquid in a case 12 formed of a copper plate with a thickness of 0.2 mm, and a weight 14 of copper, lead, etc. weighing about 2 g is housed in the case 12. has been done.

In the case of a conventional structure without such a dynamic vibration absorber, as mentioned above, abnormal vibrations of 1000 Hz or less occur between the medium and the head due to the deterioration of the medium surface, which in turn causes the problem of medium separation. It was hot. To explain this vibration in more detail, the upper head 2 on the movable side vibrates in the front and rear directions with respect to the rotational direction, and the upper head 2 vibrates together with the medium.

As a result of experiments, it has been confirmed that the vibration, which has been a problem in the past, can be removed (absorbed) by adding the dynamic vibration reducer 11. The dimensions of the dynamic vibration absorber 11 used in the experiment are height H = 2 mm, outer diameter D =
12 mm, and the head assembly structure with this dynamic vibration absorber 11 attached is shown on a 1/1 scale in FIGS. 3 and 4.

Effects of the Invention As described above, according to the present invention, a dynamic vibration absorber containing a viscous liquid and a weight is attached to the head arm that supports the head on the movable side. 1000 occurring in
It is possible to absorb and eliminate vibrations of Hz or less using this dynamic vibration absorber. Therefore, stable reading and writing can be achieved.

[Brief explanation of the drawing]

Figure 1 is a front view showing the conventional head assembly structure;
FIG. 2 is a plan view of the same, FIGS. 3 to 5 show embodiments of a head vibration isolation structure for a floppy disk device according to the present invention, and FIG. 4 is a head assembly structure to which the present invention is applied. 4 is a plan view of the same, and FIG. 5 is a front sectional view of the dynamic vibration reducer with high damping effect. In the figure, 1 and 2 are heads, 3 is a head support plate,
4 and 6 are gimbals, 5 is a head arm, 7 is a leaf spring, 11 is a dynamic vibration absorber with high damping effect, 12
is a case, 13 is silicone oil, and 14 is a weight.

Claims (1)

[Scope of Claims] 1. A first head provided on a head support plate, a head arm connected to the head support plate via a leaf spring, and a second head provided on the head arm. , a floppy disk device that reads and writes information to and from a disk medium by sandwiching the disk medium between the first head and the second head; A head vibration isolation structure for a floppy disk device that is characterized by attaching a vibration absorber to absorb vibrations of 1000Hz or less.