JPH0770140B2 - Floppy disk device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floppy disc device, and more particularly to a floppy disc device provided with a disc retainer suitable for preventing occurrence of unstable vibration. Is.

[Conventional technology]

A conventional floppy disc device is provided with pads on both sides of a floppy disc, which is a flexible thin magnetic disc, as described in JP-A-50-67620, and the pad is elastically attached to the floppy disc. By pressing, the vibration due to the rotation of the Flotpie disk is suppressed, and the reliability of reading and writing information is increased.

FIG. 8 is a partial plan view of a conventional floppy disc.
3 is a schematic view of the mounting position and shape of the disk pressing arm in the above technique.

The floppy disc 2 housed in the jacket 1, which is a protective bag, rotates in the direction of the arrow by the driving means (not shown). Read information on this floppy disc,
The magnetic head 5 for writing is supported by the gimbal 4 and the carriage 13 ', and performs a seek motion in the radial direction of the floppy disk by a driving means (not shown).
6 is a clamp for holding the floppy disk 2 in the jacket 1 and holding it, 7 is a media window opened in the jacket 1, and the magnetic head 5 is used for the floppy disk 2 by using the media window 7. It is possible to access the information track section of the.

Reference numeral 9'denotes a disk pressing arm having a disk pressing pad for pressing the floppy disk. In FIG. 8, the upstream side of the magnetic head 5 viewed from the rotation direction (arrow direction) of the floppy disk 2 and the upstream side of the magnetic head 5, in a direction substantially perpendicular to the rotational direction of the floppy disk,
The disk pressing arm 9'is extended. The eighth
Although the disk pressing arm 9'is shown on the upstream side in the drawing, it is generally arranged on both the upstream side and the downstream side with respect to the magnetic head 5.

However, the technique does not consider what kind of pressing method is effective for the shape of the pad, especially the rotation of the floppy disc, and it is not possible to completely suppress the vibration of the floppy disc. It was

In the floppy disc device, the vibration of the floppy disc and the magnetic head contacting it causes the reading of information,
It greatly affects the reliability of writing. On the other hand, it is considered that an effective method is a mechanism in which the floppy disk is pressed against a certain reference surface via a disk pressing pad and smoothly rotated, as in the above-mentioned conventional technique. However, the above-mentioned prior art has not considered what kind of vibration mode the Flotpy disk vibrates.

FIG. 9 is a schematic diagram of vibration of a general Flotpies disk.

When the conventional general Froppy disk 2 generates unstable vibration, it enters a vibration mode as shown in FIG. FIG. 9 is intended to represent the peaks or troughs of vibration at a certain moment, and the solid line on the second surface of the floppy disk represents the node of vibration. This vibration is affected by the natural frequency of the magnetic head 5, the carriage portion 13 ', the initial deformation of the media, the size, the coefficient of friction, etc., which cannot be generally stated, but the frequency is 300 to 400 Hz, The mode shown in FIG. 9 with an amplitude of about 0.1 mm is likely to occur. The wavelength of this vibration is
For example, in the case of a 3.5 ″ disk, it is about 20 mm in the circumferential direction.

The actual vibration is such a vibration.
It is considered to move in the rotation direction with the rotation of. When such vibrations occur, the contact between the floppy disk 2 and the magnetic head 5 is significantly deteriorated, which causes defective reading and writing of information.

The conventional disk pressing pad shown in FIG. 8 is provided on a disk pressing arm 9'having a shape extending in a direction substantially perpendicular to the rotation direction of the floppy disk 2.
The disk pressing pad of this shape is effective for the vibration generated and moving on the upstream side of the disk pressing pad in the vibration mode as shown in FIG. 9, but this pad is regarded as one boundary. It has little effect on the generated vibration.

Therefore, in order to prevent the generation of the vibration mode as shown in FIG. 9, the present inventors 1) press the magnetic head 5 as close as possible, 2) inflow the floppy disk 2 to the magnetic head 5. In consideration of both of the directions parallel to the direction, that is, wide pressing of the antinodes or antinodes to the vibration nodes or antinodes, preferably at right angles to each other, another Flotpies disk device shown in FIGS. developed.

FIG. 3 is a plan view of another conventional floppy disk device, FIG. 4 is a sectional view taken along the line AA ′ of FIG. 3, and FIG. 5 is a schematic view of the vicinity of the magnetic head of FIG. A plan view, FIG. 6 is a sectional view taken along the line BB ′ in FIG. 5, and FIG. 7 is a sectional view taken along the line C- in FIG.
It is a C'cross section.

First, with reference to FIGS. 3 and 4, a schematic structure of the Froppy disk device will be described.

Flotpie disk 2 is a jacket 1 related to protective parts.
It is rotatably housed inside. Floppy disc 2
Is inserted into the apparatus through the disk inlet / outlet 3 of the chassis 11 while being accommodated in the jacket 1.

The floppy disc 2 is attached to the chassis 11 at a predetermined position, and then the knob 17 is rotated so that the shaft 16 is rotated.
The cam 24 attached to the clamp causes the clamp 6 and the flat motor for driving the disk via the clamp pressing plate 23.
It is sandwiched between 19 and 22 spindles. The floppy disc 2 is a flat motor 19, which is a driving means for rotating the floppy disc 2, and a bearing.
It is configured to rotate with the rotation of a spindle 22 supported by 20.

On the other hand, a pair of upper and lower magnetic heads 5 for sandwiching the floppy disc 2 and reading and writing information on the floppy disc 2 are provided. This magnetic head 5 comes into contact with the floppy disk 2 in the jacket 1 at the media window 7 which is the opening of the jacket 1. The magnetic head 5 is constantly pressed by the force of the pressing spring 21. The disk 2 is sandwiched, and in this state, reading and writing of the recording on the floppy disk 2 are performed.

The pair of upper and lower magnetic heads 5 are moved to a predetermined position on the floppy disk 2 by the driving means described below.

The pair of upper and lower magnetic heads 5 are attached to the upper carriage 13 and the lower carriage 14 via a gimbal 4 having 0 to 2 degrees of freedom, respectively. The lower carriage 14 is movably mounted on two rails 26, and the upper carriage 13
Is elastically attached to the lower carriage 14 via the original spring 25, and when the magnetic disk 2 is moved in and out and is dapped,
It can be lifted to a position where it does not interfere with the jacket. The lower carriage 14 is connected to a stepping motor 15 via a metal belt 18, and a magnetic head can be set at an arbitrary track position of the magnetic disk 2 according to a rotation angle of the stepping motor 15.

Next, the disk pressing portion will be described with reference to FIGS. 5 to 7 in addition to FIGS.

As shown in the figure, two disk pressing pads 10 are provided on the upstream side of the magnetic head 5 in the rotational direction of the floppy disk 2 in a direction parallel to the inflow direction of the floppy disk 2 to the magnetic head 5. Has been. The disk pressing pad 10 is attached to a disk pressing arm 9 having a pad mounting portion 9a having a shape shown in FIG. 5, and the disk pressing arm 9 is connected to a loading electromagnet 12. By the loading electromagnet 12, the disk pressing pad 10 is pulled up to a position where it does not interfere with the jacket 1 when the floppy disk 2 enters and exits the chassis 11.

A disk support 8 is provided on the chassis 11 at a position corresponding to the disk pressing pad 10. When the floppy disc device is driven, the disc pressing pad 10 presses the magnetic disc 2 together with the disc support 8 together with the disc support 8 with a predetermined force by the loading electromagnet 12 via the disc pressing arm 9. .

[Problems to be Solved by the Invention]

The improved disk pressing pad 10 in the Flotpies disk device shown in FIGS. 3 to 7 has a node or antinode of vibration, preferably antinode and antinode for the vibration mode of unstable vibration as shown in FIG. It is possible to hold down and spread out at right angles.

Generally, the unstable vibration is generated due to, for example, the fluctuation of the contact friction between the floppy disk and the magnetic head, and when the vibration as shown in FIG. 9 is generated in the floppy disk 2, the disk pressing pad is Reference numeral 10 denotes a floppy disk 2 which holds the vibration 1 or the belly of the floppy disk 2, preferably the belly and the belly together with the jacket 1.
And the magnetic head 5 are well contacted.

However, the conventional disk pressing pad shown in FIG. 3 to FIG. 7 only indirectly suppresses the unstable vibration of the floppy disk 2 through the jacket 1, and the unstable vibration is directly suppressed. Since it is not suppressed, there is a problem that reliability is lacking in terms of completely preventing reading and writing defects of information.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and directly and effectively suppresses the occurrence of unstable vibrations in the floppy disc by pressing the floppy disc directly in contact with the floppy disc itself. However, it is an object of the present invention to provide a floppy disk device that can economically enhance the reliability of the device.

[Means for Solving the Problems]

In order to achieve the above object, the structure of a floppy disk device according to the present invention is such that a floppy disk housed in a protective component having a media window, a driving means for rotating the floppy disk, and the floppy disk. A magnetic head for reading and writing information on the disk,
In a floppy disc device having a drive means for moving the magnetic head to a predetermined position on the floppy disc, the floppy disc device holds the floppy disc in the cassette relating to the protection component. As described above, a disk pressing pad is provided in the cassette, and the disk pressing pad is located on the upstream side of the media window as viewed from the rotation direction of the floppy disk with respect to the magnetic head, and the magnetic head of the floppy disk is provided. Is provided in a direction parallel to the inflow direction with respect to, and corresponding to only the inner peripheral portion and the outer peripheral portion of the floppy disc, so as to be in contact with both sides of the floppy disc, the shape of the disc pressing pad, The side in the direction parallel to the inflow direction of the floppy disk to the magnetic head is It is obtained and the quadrilateral shape is a long side having a length longer than the wavelength of the instability vibrations of Rotsu copy disc.

[Action]

The disk pressing pad according to the above technical means abuts against the unstable vibration of the Flotpies disk, that is, the vibration mode as shown in FIG. A quadrilateral shape having a long side having a length equal to or longer than that, and directly and effectively suppressing such a vibration mode by directly pressing the node or antinode of the vibration, preferably the antinode and the antinode widely in the right angle direction. You can

As a result, good contact between the floppy disk and the magnetic head can always be obtained, information reading and writing defects can be prevented, and the reliability of the floppy disk device can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 is a partially schematic plan view of a cassette portion of a floppy disk device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line D-D 'in FIG. In the figure, those having the same reference numerals as those in FIG.

Further, in the floppy disk device of the present embodiment, drive means for rotating the floppy disk 2, a magnetic head 5 for reading and writing information on the floppy disk 2, and the magnetic head 5 are described above. Since the driving means for moving it to a predetermined position on the floppy disc 2 is based on the prior art shown in FIGS. 3 and 4, its illustration is omitted.

In this embodiment, the floppy disc 2 is housed in a cassette 27 which is a protective member. Floppy disc 2
Is clamped by the clamp 6, and not shown here,
As shown in the figure, the flat motor 19 is a drive means for rotating the floppy disk 2, and the spindle 22 supported by the bearing 20 is rotated to rotate with the rotation.

Although not shown here, the pair of upper and lower magnetic heads are
As shown in Figure 4, the upper carriage 1 through the gimbal 4
3, the magnetic head 5 is attached to the lower carriage 14, and the detailed description thereof is omitted, but the magnetic head 5 can be moved to any position of the floppy disk 2 according to the rotation angle of the stepping motor 15. There is.

The disk pressing pad 10A is located on the upstream side of the magnetic head (not shown in FIG. 1 but at the position of the media window 7) as viewed from the rotation direction (arrow) of the floppy disk 2, and 2 in a direction parallel to the inflow direction with respect to the magnetic head, and corresponding to only the inner peripheral portion and the outer peripheral portion of the floppy disk 2, are provided in the cassette 27 so as to contact both sides of the floppy disk 2. There is. That is, as shown in FIG. 2, two pairs of disc pressing pads 10A for holding the floppy disc 2 from above and below are attached to the inner surface of the cassette 27 and are in direct contact with the upper and lower faces of the floppy disc 2. .

The shape of the disk pressing pad 10A is such that the side in the direction parallel to the inflow direction of the floppy disk 2 with respect to the magnetic head is longer than the wavelength of unstable vibration of the floppy disk 2. It has a quadrilateral shape that is a side.

According to the present embodiment, the disk pressing pad 10A has unstable vibrations upstream of the magnetic head of the floppy disk 2, that is, nodes or antinodes of vibrations, preferably antinodes and antinodes for the vibration mode shown in FIG. Can be effectively suppressed by pressing the
This has the effect of increasing the reliability of the floppy disk device.

Further, the present embodiment does not require a great improvement in the conventional Flotpies disk device itself, and also in terms of economic efficiency, it can be simply configured with a smaller number of parts than the conventional device, and at a low cost. , High reliability can be obtained.

In this embodiment, the disk pressing pad is provided only on the upstream side of the media window with respect to the magnetic head as viewed from the rotation direction of the floppy disk, but the present invention is not limited to this. It goes without saying that they may be provided on both the upstream side and the downstream side. If it is provided on at least the upstream side of the upstream side and the downstream side, the effect of suppressing the unstable vibration occurring on the upstream side can be first obtained.

〔The invention's effect〕

As described above, according to the present invention, since the disc pressing pad that directly contacts the floppy disc itself is provided, the occurrence of unstable vibration in the floppy disc is directly and effectively suppressed, and the device is economically used. It is possible to provide a floppy disk device that can improve the reliability of the device.

[Brief description of drawings]

FIG. 1 is a partially schematic plan view of a cassette portion of a floppy disc device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line D-D 'of FIG. 1, and FIG. FIG. 4 is a plan view of another Floppy disk device, FIG. 4 is a sectional view taken along the line AA ′ of FIG. 3, FIG. 5 is a partial plan view schematically showing the vicinity of the magnetic head of FIG. 3, and FIG. 5 is a sectional view taken along the line BB ′ in FIG. 5, FIG. 7 is a sectional view taken along the line CC ′ in FIG. 5, FIG. 8 is a partial plan view of a conventional floppy disk, and FIG. 9 is a general plan view. It is a schematic diagram of the vibration of a different Flotpie disk. 2 ... Floppy disk, 5 ... Magnetic head, 10A ...
… Disk press pad, 27 …… Cassette.

Claims (1)

[Claims] 1. A Flotpie disk housed in a protective component having a media window, drive means for rotating the Flotpie disk, and a magnetic head for reading and writing information on the Flotpie disk. In a floppy disk device provided with a driving means for moving the magnetic head to a predetermined position on the floppy disk, the floppy disk device is a device for removing a floppy disk in a cassette related to the protective component. A disk pressing pad is provided in the cassette so as to be held, and the disk pressing pad is located on the upstream side of the media window as viewed from the rotation direction of the Froppy disk with respect to the magnetic head. In the direction parallel to the inflow direction to the magnetic head and inside the floppy disk The disk pressing pad has a shape parallel to the inflow direction of the floppy disk with respect to the magnetic head. Is a quadrilateral which is a long side having a length equal to or longer than the wavelength of the unstable vibration of the floppy disk.