JPH0376074A - Floppy disk - Google Patents

Abstract

PURPOSE:To prevent dust from entering into a case from a clearance between a chuck window and a hub or a disk by providing a liner in which the tip edge provided with a base end edge along an edge part of the chuck window abuts on or close to the reverse side of the hub or the disk. CONSTITUTION:First liners 25, 26 are installed on the surface and the reverse side of a case 16, respectively, both of them consist of a chemical fiber sheet having a quality for sucking dust, and also, in an edge part of a chuck window 21 of the case 16, a second liner 27 is provided in a position opposed to a flange part 18b of a hub 18, and it consists of a chemical fiber having a quality for sucking dust in the same way. Also, as for a second liner 27, its base end edge part is coupled to an edge part of the chuck window 21, the tip part is allowed to abut on the part in which the flange part 18b of the hub 18 and an inside edge part of a disk 17 are coupled, and it is controlled that an air current flows into the case 16 from the chuck window 21. In such a way, it can be prevented that dust enters in from the chuck window 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a floppy disk used as a signal storage medium for office automation equipment such as personal computers and word processors.

(Prior Art) A commonly used floppy disk is shown in FIGS. 3 and 4. A disk 1, which is a recording medium, is provided with a hub 2 approximately at its center. The hub 2 includes a chucking surface 2a in which an engagement hole (not shown) is formed for chucking, which will be described later, and a flange edge 2b formed by bending along the edge of the chucking surface 2a. So, for this flange edge 2b,
The inner edge of the disk 1, which has a circular hole in its center, is bonded by polymerization.

This disk 1 is housed in a case 3. This case 3 is formed into a rectangular box shape with a short thickness dimension,
A chuck window 4 is bored at a position corresponding to the hub 2. This chuck window 4 is formed along the shape of the hub 2, and is configured to chuck the chucking surface 2 of the hub 2.
a is exposed to the outside.

Furthermore, a pair of head windows 5 are provided on a portion of the front and back surfaces of the case 3 facing the recording surface of the disk 1, respectively.
is drilled. These head windows 5 are formed in substantially the same shape, and are rectangular long in the radial direction of the disk 1.

The head windows 5 formed on the front and back surfaces of these disks 1 are provided with unillustrated dustproof covers whose cross sections are bent into a U-shape. This dustproof cover is provided so as to be slidable within a predetermined range along the edge of the case 3, and on the side surfaces corresponding to the front and back surfaces of this dustproof cover, the head window is placed at one movement limit position in the sliding direction. A through hole corresponding to the shape of 5 is bored.

A liner 6.7 is attached to the inner surface of each of the walls forming the front and back surfaces of the case 3, covering the portion facing the recording surface of the disk 1. These liners 6.7 have a shape in which a central portion corresponding to the flange edge 2b of the hub 2 and a portion corresponding to the head window 5 are penetrated.

Then, a floppy disk 8 configured as described above is installed.
When inserted into the floppy disk drive device 9,
First, the end of the rotating shaft 10 of the floppy disk drive device 9 inserted into the chuck window 4 is brought into contact with the chucking surface 2a of the hub 2 of the floppy disk 8. Then, a locking convex portion (not shown) formed on the end surface of the rotating shaft 10 engages with an engaging hole (not shown) of the chucking surface 2a to perform chucking.

Along with this chucking, the floppy disk 8
The dust-proof cover (not shown) is slid, the through-hole of the dust-proof cover is made to correspond to the head window 5 of the case 3, and the pair of magnetic heads 11.
12 are inserted into the case 3 from the front and back sides, and sandwich the recording surface of the disk 1 from the thickness direction with a predetermined pressure.

The disk 1 held between the pair of magnetic heads 5 is driven by a drive source such as a motor (not shown) at a rotation speed of, for example, 300 rpm to 360 rpm, and the magnetic heads 5 record signals. and playback etc.

Such a floppy disk 8 is provided with a liner 6.7 as described above. These liners 6.7 are made of, for example, chemical fibers having dust-absorbing properties, and are provided for the purpose of adsorbing dust adhering to the recording surface of the disk 1 and cleaning the recording surface.

However, when the floppy disk 8 is rotated by the floppy disk drive device 9 in the direction of the arrow A shown in the figure, the floppy disk 8 rotates? An air current rising along dllO is generated and flows into the case 3 from the chuck window 4. Due to the generation of such air currents, dust and the like generated in the drive section of the floppy disk drive device 9 may enter the case 3.

The dust that has entered in this way adheres to the recording surface of disk 1,
Furthermore, a magnetic head 1 that holds this recording surface under a predetermined pressure
1.12 and scratched the recording surface. If the recording surface is scratched in this way, the recorded signal may be lost, and the floppy disk 8 itself may become unusable.

(Problem to be Solved by the Invention) When a floppy disk is rotated by a floppy disk drive device, an air current that rises along the rotation axis is generated, and this air flow flows into the chuck window of the floppy disk, thereby removing dust. There was a risk that it could get inside the floppy disk case. Intrusion of such dust damages the recording surface of the disk, leading to loss of recorded signals.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a floppy disk that reduces the intrusion of dust from the chuck window and enhances the effect of preventing dust from adhering to the recording surface of the disk. purpose.

[Structure of the Invention (Means for Solving the Problems)] The present invention accommodates a magnetically recordable disk in a case, provides a hub approximately in the center of the disk, and provides a hub on the back surface of the case corresponding to the hub. A chucking window is formed to expose the hub to the outside, and a head window is formed on the front and back surfaces of the case facing the magnetic recording surface of the disk, through which a pair of magnetic heads are inserted to sandwich the disk. The floppy disk is provided with a liner along the edge of the chuck window that abuts or is close to the hub or the back surface of the disk.

(Function) By providing a liner that contacts or is close to the hub or disk along the edge of the chuck window, the airflow that rises along the rotation axis due to the drive of the floppy disk drive device can enter the floppy disk case. can be prevented from happening.

(Example) An example of the present invention will be described with reference to FIGS. 1 and 2. The outer shape of the floppy disk 15 shown in the figure is formed by a rectangular box-shaped case 16 with a short thickness dimension. A disk 17, which is a recording medium, is housed within the case 16. This disk 17 is, for example, a flexible magnetic disk made of a polyester sheet coated with a magnetic material, and in the center thereof is a hub 18 made of metal, for example.
is provided. This hub 18 has a circular chuck surface 1
8a, and an engagement hole (not shown) is formed in this chuck surface 18a, into which an engagement convex portion formed on the end face of a rotating shaft 20 of a floppy disk drive device 19, which will be described later, engages.

Further, the peripheral edge of the chuck surface 18a is bent into a substantially L-shaped cross section to form a flange portion 18b. The flange portion 18b has an overlapping edge portion of a through hole bored through approximately the center of the disk 17 and is coupled to the flange portion 18b.

A chuck window 21 is provided on the back surface of the case 16 corresponding to the chuck surface 18a of the hub 18 so that the chuck surface 18a is exposed to the outside. A rotating shaft 20 of a floppy disk drive device is inserted into this chuck window 21, and is configured to be chucked onto the chuck surface 18a of the hub 18. That is, the engagement convex portion formed on the end surface of the rotating shaft 20 engages with the engagement hole formed on the chuck surface 18a of the hub 18, thereby making it possible to transmit rotational force.

Further, the flange portion 18b of the hub 18 is bent toward the surface side of the case 16.
A guide piece 22 is formed to protrude inward in a circumferential manner from a part of the case 16 corresponding to the inner circumferential surface of b. This guide piece 22 guides the rotation of the disk 17.

Furthermore, a head window 2 having the same shape is provided on a portion of the front and back surfaces of the case 16 facing the recording surface of the disk 17.
3 are bored so as to face each other with the disk 17 in between.

These head windows 23 are formed in a long rectangular shape in the radial direction of the disk 17, into which the magnetic head of one floppy disk drive device is inserted. A dustproof cover (not shown) is attached to the head window 23 so as to be slidable along one side of the case 16. This dustproof cover is formed with a U-shaped cross section that covers one side of the case 16 from both sides. The range of the slide movement is restricted to a predetermined range, and a through hole corresponding to the head window 23 is bored at one slide movement restriction position. When this dust cover is moved to the other side, the head window 2
3, and is provided with biasing means for biasing the dustproof cover toward the other side when not in use.

When the pair of magnetic heads 24 provided in one floppy disk drive come into contact with the recording surface of the disk 17, the dustproof cover is slid and moved.
The head window 23 and the through hole are made to correspond to each other, and the magnetic head 24 is suppressed in this state.

Furthermore, on the inner wall surface of the case 3 of the floppy disk 15, first liners 25 and 26 having substantially the same shape are attached to the portion facing the recording surface of the disk 17.These first liners 25 and 26 are respectively attached to the front and back surfaces of the case 3.These first liners 2
5 and 26 are both made of chemical fiber sheets that have the property of adsorbing dust.

Further, a second liner 27 is provided at the edge of the chuck window 21 of the case 16 at a position facing the flange portion 18b of the hub 18. This second liner 27 is annular with a rectangular cross section, and is also made of chemical fibers that have the property of adsorbing dust, similar to the first liners 25 and 26. Here, the cross-sectional shape of the second liner 27 is not limited to a rectangular shape, and may have a round tip.

The second liner 27 has its proximal edge joined to the edge of the chuck window 21 as described above, and its distal end abuts the part where the flange 18b of the hub 18 and the inner edge of the disk 17 are joined. being touched.

That is, the gap formed between the chuck window 21 and the edge of the hub 18 is closed by the second liner 27.

By providing the second liner 27 in this manner, the following effects are produced.

As shown in FIG. 1, when the disk 17 is rotated by one floppy disk drive device, an upward air current is generated along the rotating shaft 20. As shown in FIG. This updraft is guided radially along the hub 18. Then, the second liner 27 lowers the liquid to the lower side of the chuck window 21 and flows outward along the back surface of the case 16.

In other words, the chuck window 21 of the case 16 and the hub 18
and the second liner 2
By closing the chuck window 7, it is possible to restrict airflow from flowing into the case 16 from the chuck window 21. Accordingly, the floppy disk 15 can have the effect of preventing dust from entering through the chuck window 21. Here, since the rotary drive unit of one floppy disk drive device is located at the bottom of the chuck window 21, there is a very high possibility that dust will enter there. Preventing the intrusion of dust from the face is highly effective in improving the reliability of the floppy disk 15.

In the past, the structure was such that air could easily enter the case 16 through the gap between the chuck window 21, the 1st block 18, and the disk 17, but the above structure allows air to easily enter the case 16. Intrusion can be regulated. This is highly effective in prolonging the life of the floppy disk 15 and stabilizing the quality of the floppy disk 15, where the intrusion of dust can directly lead to loss of recorded signals.

In the conventional structure, there was no structure for preventing dust from entering the case 16 by preventing air from entering from the chuck window 21. In this respect, the present embodiment can provide a floppy disk 15 that is significantly more effective in preventing dust from entering than the conventional structure.

Note that the present invention is not limited to the above embodiment. The second liner 27 is made of chemical fibers that have the property of adsorbing dust and has a rectangular cross section, but is not limited to this, and may be made of fibers that do not adsorb dust or synthetic resin that has elasticity. The material and shape are not limited to these as long as air can be prevented from flowing in through the chuck window 21. Further, the material of the hub is not limited to metal, and may be made of plastic.

[Effect of the invention] By providing a liner with a proximal edge along the edge of the chuck window and a distal edge in contact with or close to the back surface of the hub or disk, the gap between the chuck window and the hub or disk can be reduced. This prevents airflow from entering through the gap, and prevents dust from entering the case together with the airflow through this gap. This prevents dust generated in the rotary drive unit of the floppy disk drive device located below the chuck window from entering the case. In other words, in the conventional structure, airflow easily entered the case from the chuck window, but in the present invention, the liner restricts the airflow from entering the case from the chuck window and prevents dust from entering. The intrusion prevention effect can be made extremely high.

[Brief explanation of drawings]

Figures 1 and 2 show one embodiment of the present invention; Figure 1 is a sectional view showing a state in which a floppy disk is rotationally driven by a floppy disk drive device;
The sectional view taken along the line ■-■ in the figure, Figures 3 and 4 are conventional examples, and Figure 3 is a sectional view taken along the line ■-■ in Figure 4. FIG. 2 is a cross-sectional view showing a state in which the disk drive device is rotationally driven. 15...floppy disk, 16...case, 1
7... Disc, 18... Hub, 21... Chuck window, 23... Head window, 27... Second liner (liner).

Claims (1)

[Claims] A case, a magnetically recordable disk housed within the case, a hub provided approximately in the center of the disk, and a chucking drilled in the back surface of the case corresponding to the hub to expose the hub to the outside. A floppy disk device comprising: a window; and a head window which is formed on the front and back surfaces of the case facing the magnetic recording surface of the disk and inserts the disk in a sandwiched state with a pair of magnetic heads facing each other, the chuck window A floppy disk characterized in that a liner is provided along the edge of the disk in contact with or in close proximity to the back surface of the hub or the disk to prevent dust from entering the case.