JPS6316048Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disk cartridge typified by a floppy disk, and is an improvement to the disk housed in the disk case.

Recently, a magnetic disk is housed inside a hard case type disk case, and the magnetic disk consists of a magnetic sheet and a two-piece hub that clamps and holds the periphery of the central hole of the sheet. A configuration in which a drive shaft engages with a hub to rotationally drive a magnetic disk has been proposed.

There, the relevant hub consists of an upper hub structure and a lower hub structure that are inseparably joined together across the periphery of the central hole of the magnetic sheet, and the magnetic Although a structure is adopted in which the peripheral edge of the central hole of the sheet is clamped and held, deformation occurring at the clamping part of the magnetic sheet tends to spread to the outer circumferential direction of the sheet. In particular, if the periphery of the central hole of the magnetic sheet is clamped radially across the opposing surfaces of both hub components, the magnetic sheet will be significantly deformed to the outside of the outer peripheral surface of the hub, causing the magnetic There was a drawback that the flatness of the sheet could not be ensured well.

Focusing on this fact, this invention ensures that when the periphery of the central hole of the seat is clamped and held between the opposing surfaces of the upper and lower hub components that make up the hub, deformation will occur in the seat due to the clamping. The aim is to prevent this from happening.

The details will be explained below based on the drawings.

In Figures 1 to 6, the disk cartridge (floppy disk) of the present invention is made by combining upper and lower plastic cases 1a and 1b with lids and joining them together by ultrasonic welding at several points indicated by P. It consists of a flat rectangular hard case type disk case 1 and a magnetic disk 2 rotatably housed inside the disk case 1.

The disk case 1 has a drive shaft insertion window 3 located near the center near the front, a magnetic head insertion window 4 located in front of the drive shaft insertion window 3 and long from front to back, and a magnetic head insertion window 4 located at the rear of the drive shaft insertion window 3. small-diameter index hole 5, positioning holes 6, 6 located on the front left and right sides with different diameters on the left and right, and write protection holes 8, located on the front left and right sides, which are opened and closed by members 7 mounted inside the case. 8, and these windows and holes are provided vertically through each other.

The magnetic disk 2 includes a disk-shaped magnetic sheet 11 having a through hole 10 near the hole 9 provided in the center and corresponding to the index hole 5, and a hub 12 that clamps the peripheral edge of the central hole 9 of the magnetic sheet 11. Consisting of

Upper and lower cases 1a that constitute the disk case 1.
On each inner surface of the magnetic disk 1b, annular walls 15, 15 concentric with the outer periphery of the drive shaft insertion window 3 are vertically spaced apart and protrude from each other, and the hub 12 of the magnetic disk 2 is The annular walls 15, 15 are located above the drive shaft insertion window 3 in the disk case 1.
Free movement in the radial direction is restricted by contact with the inner surface. In the illustrated example, an insertion hole 16 is formed at the center of the hub 12, and an insertion hole 17 is formed at one location on the outer periphery so as to pass through the upper and lower sides. The bifurcated drive shaft is connected to the insertion hole 16 of the hub 12 and the insertion hole 1.
7 to rotate the magnetic disk 2.

Guide grooves 20, 20 extending from the front end to the vicinity of the rear end are formed in the outer surfaces 18, 18 of the left and right side walls 19, 19 of the disk case 1, respectively.
The guide grooves 20 are used to insert the disk drive into the magnetic recording device.

It is also necessary to prevent dust from entering the inside of the disk case 1 through the index hole 5 and especially the magnetic head insertion window 4 when the disk cartridge is not in use. Therefore, a pair of upper and lower shutter members 21, 21 for opening and closing the magnetic head insertion window 4 and the index hole 5 are assembled inside the disk case 1. Each shutter member 21 is made of, for example, a synthetic resin or a metal plate as in this embodiment, and includes a base end portion 23 having a fitting hole 22, and a horizontal plate portion extending forward from the base end portion 23. 24 and a notch 25 formed in the proximal end 23 corresponding to the index hole 5, the proximal end 23 is fitted onto the outer periphery of each of the annular walls 15 and pivotally supported in a locking manner. , upper and lower case 1
It is fitted into a recess 26 formed on the inner surface of each annular wall 15 and rotates within a certain range. After the base end portion 23 of the shutter member 21 is fitted into each annular wall 15, a protrusion 27 provided on the protruding end surface of the annular wall 15 is heated and crushed to prevent it from coming off. The extending end of the horizontal plate portion 24 of each shutter member 21 is connected to the tip of the slide operating member 29. This operating member 29 is a plastic molded product that is shaped like a strip with a constant width on the top and bottom and can be freely bent and deformed, and its upper and lower edges are connected to slide grooves 30 and 30 formed on the inner surfaces of the upper and lower cases 1a and 1b.
is mated to. The slide groove 30 is a straight portion 3 formed along the left side wall 19 of the disk case 1.
0a and a series of curved portions 30b formed around the front side of the case, and a knob 31 protruding from the rear end side of the operating member 29 has a constant length in the front and rear directions provided at the front and rear intermediate portions of the left side wall 19 of the case. Notch 32 having
The guide groove 20 extends through the guide groove 20 . The operating member 29 is urged to slide forward by a spring member 33 that is attached across the inner surface of the lower case 1b and the rear end of the operating member 29.

In this case, when the disk cartridge A is not in use, that is, in the normal state, the operating member 29 is
Each shutter member 21 connected to the operating member 29 is urged to slide forward in the closing direction, and the horizontal plate portion 24 of each shutter member 21 is pressed against the upper and lower opening surfaces of the magnetic head insertion window 4. At the same time, when the notch 25 is located away from the index hole 5, the proximal end 23 is inserted into the index hole 5.
The upper and lower openings are closed. When the disk cartridge is loaded into the magnetic recording device, a member (not shown) on the magnetic recording device side that engages with the guide groove 20 comes into contact with the knob 31, and the operating member 29 is moved by the spring member 3.
3, the shutter member 21 is rotated in the opening direction, and the magnetic head insertion window 4 and the index hole 5 are respectively opened.

In addition, the reference numeral 35 in the figure is a label sticking surface recessed in the rear end side of the upper and lower surfaces of the disk case 1.

Now, in FIGS. 7 to 10, the hub 12 of the magnetic disk 2 is formed into an upper hub component 3 which is molded separately from plastic and is inseparably connected to the hub 12 of the magnetic disk 2.
6 and a lower hub component 37, and the peripheral edge of the center hole 9 of the magnetic sheet 11 is clamped and held by the opposing surfaces of both hub components 36 and 37.

Both hub components 36 and 37 are in a fitting relationship through a fitting protrusion 39 provided on one side and a fitting hole 40 provided on the other side. In the illustrated example, the insertion hole 16 is provided at the center of the lower hub structure 37, and a cylindrical fitting protrusion 39 is formed upright from the periphery of the insertion hole 16, and is formed at the center of the upper hub structure 36. A fitting hole 40 into which the fitting protrusion 39 fits is provided transparently.

Then, both hub components 36 and 37 are ultrasonically welded in a fitted state to be integrally coupled. To this end, a step 41 for ultrasonic welding is formed in a circumferential manner on the outer peripheral surface of the fitting protrusion 39, and the outer diameter of the lower half of the fitting protrusion 39 is set larger than that of the upper half. The inner diameter of the fitting hole 40 is set to be smaller than the outer diameter of the lower half of the fitting protrusion 39, and a circumferential relief groove 42 for melting during ultrasonic welding is formed at the lower end periphery of the fitting hole 40. In the state where the upper hub structure 36 is fitted to the lower hub structure 37, the upper hub structure 36 is once received and supported by the stepped portion 41, as shown in FIG. 36 is melted with an ultrasonic welder while pressing downward, and the outer circumferential surface of the fitting protrusion 39 and the inner circumferential surface of the fitting hole 40 are welded together. Both hub components 36.3
A magnetic sheet 11 is interposed between the magnetic sheets 7 and 7 before they are fitted together. The magnetic sheet 11 is placed on the upper surface of the lower hub structure 37 with its center hole 9 tightly fitted into the fitting protrusion 39 of the lower hub structure 37 .

Each of the hub components 36 and 37 has the aforementioned engagement hole 17.
Since the through holes 17a and 17b constituting the hub are provided in advance, both the hub components 36 and 37 must be positioned and fitted so that these through holes 17a and 17b are vertically and concentrically aligned. Specifically, the tight fit between the fitting protrusion 39 and the fitting hole 40 restricts the displacement of the hub components 36 and 37 in the radial direction. 3
It is necessary to separately regulate the positional deviation of 6 and 37 in the hub rotation direction.

For this purpose, positioning means is provided on the opposing surfaces of both the hub components 36 and 37 by fitting the concave and convex portions. In the illustrated example, the insertion hole 1 is placed across the insertion hole 16.
An elongated hole 43 that is long in the radial direction and short in the hub rotational direction is provided in the upper hub component 36 at a position 180 degrees opposite to 7, and the elongated hole 43 is provided in the lower hub component 37.
A round shaft 44 is provided which internally fits into the opposing surfaces 43a and 43a in the rotational direction of the hub, and these elongated holes 43 and the round shaft 4
Both hub components 36 and 37 are connected by concave and convex fitting with 4.
It is designed to restrict the displacement of the hub in the rotational direction of the hub. Note that the long hole 43 has opposing surfaces 43a and 43.
The shape of the radially opposing surfaces is not important, as long as a is preferably formed on a vertical plane parallel to a line passing through the center of the hub. Furthermore, the round shaft 44 effectively acts on the arcuate surface in the hub rotational direction, and the arcuate surface in the radial direction is not important. In the illustrated example, a rectangular protrusion 44a having a narrow width in the radial direction and an arcuate outer end surface in the hub rotation direction is provided on the tip side of the round shaft 44, and the tip side of the round shaft 44 is provided with an elongated hole 44 due to the size. In this embodiment, the round shaft 44 as a whole may match the shape of the protrusion 44a.

Of course, the elongated hole 43 may be a simple square hole, and the round shaft 44 may be inscribed in the four perpendicular sides of the elongated hole 43. In addition, when adopting a configuration in which the hub 12 is rotationally driven by providing a hub pawl protruding into the insertion hole 16 of the hub 12, the insertion hole 17 is not necessary, and therefore, the insertion hole 17 is not required. There is no need to control the positional shift.

As described above, since the wall thicknesses of both the hub components 36 and 37 are different in each part, it is difficult to strictly ensure the flatness of the opposing surfaces (the surfaces to which the magnetic sheets are pressed) during plastic molding.

Therefore, in the present invention, stepped surfaces 47 and 48 that abut each other are formed protruding in the circumferential direction on the radially inner end portions of the opposing surfaces of both the hub components 36 and 37, and these stepped surfaces 47 and It is characterized in that the peripheral edge of the center hole 9 of the sheet 11 is clamped and held only between the holes 48 and 48.

According to the present invention, both the plastic hub components 36 and 37 have a fitting protrusion 39 provided on one side.
The fitting hole 40 provided on the other side is not only simply fitted in a convex-concave manner, but also the outer circumferential surface of the fitting protrusion 39 and the inner circumferential surface of the fitting hole 40 are ultrasonically welded together to integrally connect them. I took it as a thing. Therefore, it is possible to firmly secure the integral bonding force between the two hub components 36 and 37, that is, the force to hold the peripheral edge of the center hole of the seat 11 between the opposing surfaces of the two, and the seat 11 and the hub 1 can be firmly secured.
Idle rotation with 2 can be reliably prevented.

In particular, on the opposing surfaces of both the hub components 36 and 37, a stepped surface 47 is provided on at least one of the radially end portions.
48 is formed protrudingly, and the peripheral edge of the central hole 9 of the sheet 11 is clamped and held at the portion where the stepped surface is formed, but as described above, the clamping and holding force of the sheet 11 is firmly ensured. Therefore, the area of the stepped surface, that is, the radial length can be reduced. This means that the area to be clamped on the sheet 11 side can be made as small as possible, which is advantageous in preventing deformation of the sheet at the clamped part. In addition, the gap g created between the opposing surfaces of both hub components 36 and 37 can increase the radial length, so even if the seat 11 is deformed due to clamping, the seat 11 within the gap g The deformation of the seat 11 can be well absorbed, and the deformation of the seat 11 can be prevented from extending further to the outer periphery of the outer peripheral surface 49 of the hub 12. Together, these have the advantage of effectively and reliably preventing deformation of the sheet 11.

In the illustrated example, stepped surfaces 47 and 48 are formed on the opposing surfaces of both hub components 36 and 37, respectively.
For example, a stepped surface may be formed only on the opposing surface of one of the upper and lower hub structures, and the opposing surface of the other hub structure may be formed to be flush with the entire surface.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing an example of a disk cartridge to which the present invention is applied, Fig. 2 is an exploded perspective view, Fig. 3 is a front view in longitudinal section at the center, Fig. 4 is a side view in longitudinal section at the center, and Fig. 5 is an exploded perspective view. 6 is a partially cutaway plan view with the magnetic head insertion window closed, and FIG. 6 is a partially cutaway plan view with the magnetic head insertion window opened. 7 to 10 show a hub, which is one of the components of the present invention, and FIG. 7 is a plan view, and FIG.
The figure is a sectional view taken along the - line in FIG. 7, FIG. 9 is a partial sectional view taken along the Y-Y line in FIG. 7, and FIG.
The figure is a longitudinal cross-sectional view showing a state in which the upper and lower hub components of the hub are being joined together. 1...Disk case, 2...Disk, 3...
...Drive shaft insertion window, 4...Magnetic head insertion window, 9...
...Central hole of seat, 11... Seat, 12... Hub, 36, 37... Upper and lower hub components, 39...
Fitting protrusion, 40... Fitting hole, 41... Step part, 42
...Melting relief groove, 47/48...Stepped surface.

Claims (1)

[Claims for Utility Model Registration] (1) A disk 2 mounted inside a disk case 1 having a drive shaft insertion window 3 and a magnetic head insertion window 4 has a sheet 11 having a hole 9 in the center;
It consists of a hub 12 that looks into the drive shaft insertion window 3, and an upper hub structure 36 and a lower hub structure 37, to which the hub 12 is inseparably connected across the peripheral edge of the center hole 9 of the seat 11. Both the hub components 36 and 37 are plastic molded products, and when the fitting protrusions 39 provided on one side and the fitting holes 40 provided on the other side are in an uneven fitting state, these fitting protrusions 39 The outer circumferential surface of the fitting hole 40 and the inner circumferential surface of the fitting hole 40 are integrally joined together by ultrasonic welding, and the opposing surfaces of both hub components 36 and 37 are stepped at at least one of the radially inner end portions. A surface is formed to protrude, so that the peripheral edge of the central hole 9 of the seat 11 is held between the opposed surfaces of the hub components 36 and 37 at the portion where the stepped surface is formed. disk cartridge. (2) Stepped surfaces 4 that butt against each other at the radially inner end portions of the opposing surfaces of both hub components 36 and 37
7 and 48 are formed in a protruding manner, and the central hole 9 of the sheet 11 is formed between these stepped surfaces 47 and 48.
2. A disk cartridge according to claim 1, wherein the peripheral edge of the disk cartridge is held in a pinched manner.