JPS6346934Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disk cartridge in which a magnetic disk is housed in a case.

First, the disk cartridge proposed by the present applicant will be described. FIG. 1 is an exploded perspective view thereof, and FIG. 2 is a top view and a bottom view thereof.
In the figure, 1 indicates a flexible magnetic disk that is based on a thin disc-shaped polymer film and has a magnetic layer uniformly formed on its lower surface;
A center plate is shown that is fixed to a circular opening in the center of a magnetic disk 1 via a ring-shaped double-sided adhesive tape 3. The center plate 2 is formed by pressing a thin metal plate and has a flange 4, to which the magnetic disk 1 is adhered. A substantially square motor shaft insertion hole 5 is formed in the center of the center plate 2, and a rectangular position regulating pin insertion hole 6 is formed at a position offset from the insertion hole 5 by a predetermined distance.

A magnetic disk 1 integrally having the center plate 2 is housed in a case formed by combining an upper shell 7 and a lower shell 8. These shells 7 and 8 are, for example, injection molded products made of ABS resin containing an antistatic agent, and their outer peripheral portions are joined to each other by ultrasonic welding. A circular opening 9 is formed in the center of the lower shell 8, and the center plate 2 is placed in this opening 9 with some play. Reference numeral 10 indicates an arcuate rib divided into four parts extending along a concentric circle with respect to the opening 9, and an arcuate rib is also formed corresponding to the inner surface of the upper shell 7.

Further, a liner 1 made of a nonwoven fabric such as rayon is provided on the inner surface of each of the upper shell 7 and the lower shell 8.
1 and 12 are heat welded or ultrasonic welded.
The liners 11 and 12 are provided to automatically remove dust and prevent dropout when the magnetic disk 1 rotates, as well as to prevent abrasion of the magnetic disk 1 and generation of static electricity. When lining the lower shell 8 with the liner 12, a tongue piece 13 made of synthetic resin is interposed, and the liner 12
The magnetic surface of the magnetic disk 1 can be surely pressed against the magnetic surface of the magnetic disk 1.

Elongated holes 14, 15, 16, 17 of the same shape extending in the radial direction of the magnetic disk 1 are formed in the upper shell 7, lower shell 8, and liners 11, 12, and in the combined state, these elongated holes are superimposed. When the disk cartridge is installed in the entire apparatus, the magnetic head comes into contact with the magnetic disk 1 through the long hole 17 of the lower shell 8 and the long hole 16 of the liner 12, and the long hole 14 of the upper shell 7 The head pad is inserted through the elongated hole 15 of the liner 11.

Further, recesses 18 and 19 are formed on the outer surfaces of the upper shell 7 and the lower shell 8, including the portions where the elongated holes 14 and 17 are formed, and in these recesses 18 and 19, a long U-shaped cross section of aluminum or the like is formed. Holes 14-17
A shutter 20 having slits 21 and 22 of the same shape is slidably attached. Second
As shown in Figure B, a guide groove 23 is provided along the side edge of the outer surface of the lower shell 8, and correspondingly, three protrusions 24 are provided on the shutter 20 that protrude inward by pressing or the like. Therefore, the shutter 20 is guided by the guide groove 23 and the second
As shown by solid lines in Figures A and 2B, the elongated holes 16 and 17 for inserting the head and the elongated holes 14 and 15 for inserting the pad coincide with the slits 21 and 22, respectively, so that the magnetic disk 1 is exposed to the outside. As shown by the imaginary line in the figure above, the elongated hole 14
.about.17 are closed and the magnetic disk 1 is covered by the shutter 20, so that it is possible to select an unused state. This shutter 20 protects the magnetic disk 1 and prevents dust from entering.

Furthermore, a lug 25 is provided at one corner of the lower shell 8 to prevent accidental erasing.
If 5 is broken off and removed, it cannot be erased. As shown in FIG. 2B, a pair of positioning holes 26 and 27 are provided at the two corners of the lower shell 8 for positioning the disk cartridge when it is attached to the disk recorder body. ing. The positions 28 and 29 shown in the diagonal diagram in FIG. The cartridge is supported at the reference position. In this state, the magnetic disk 1 is rotated by the motor, and digital or analog signals are recorded or reproduced.

In the disk cartridge described above, the liner 11 was welded to the inner surface of the upper shell 7 at a number of dot-like locations, as shown by black dots in FIG. That is, as shown in FIG. 4, the liner 11 was welded to the upper shell 7 by pressing it against the upper shell 7 using a heat-generated dot-shaped horn 30.
The liner 12 was applied to the lower shell 8 in a similar manner.

In FIG. 3, numeral 31 indicates a wear-preventing sheet attached to the center of the inner surface of the upper shell 7 against which the drive shaft abuts, and 32 indicates an arcuate rib.

By the way, as mentioned above, the liners 11 and 12
When ultrasonically welding the upper shell 7 and lower shell 8 lined with liners, the vibrations at that time generate fiber waste from the liners 11 and 12, and this fiber waste adheres to the magnetic disk 1. 1
A problem was recognized in which the spacing loss between the magnetic head and the magnetic head increased, resulting in dropout. Originally, the liners 11 and 12, which are intended to wipe off dust and the like adhering to the magnetic disk 1, generate fiber waste.

This invention is an attempt to solve the above-mentioned problems by devising the adhesion structure of the liners 11 and 12.

In addition, this invention takes into consideration the fact that the tongue piece 13 is provided as a biasing means to reliably press the liner 12 against the magnetic surface of the magnetic disk 1, and by devising the adhesion of the liner 12, the tongue piece This prevents the effect of No. 13 from decreasing.

An embodiment in which this invention is applied to the above-mentioned disk cartridge will be described below with reference to FIGS. 5 and 6.

FIG. 5A shows liner 1 against upper shell 7.
FIG. 5B shows a state in which the liner 12 is heat welded to the lower shell 8. FIG. In FIG. 5, diagonally shaded areas indicate welded areas. That is, at the positions of the peripheral edges of the liners 11 and 12 along the contours and the positions along the peripheral edges of the long holes 15 of the liner 11 and the long holes 16 of the liner 12, these liners 11 and 12 are connected to the upper shell 7 and the lower side. It is welded to the shell 8. However, since the liner 12 is lifted by providing the tongue piece 13 (see FIG. 1) on the lower shell 8, the liner 12 and the lower side Shell 8 is not welded.

When configured as described above, the liners 11 and 12
At the position of the peripheral edge of and the peripheral edge of the elongated holes 15 and 16,
Since the liners 11 and 12 are welded to the inner surfaces of the upper shell 7 and the lower shell 8, respectively, one side of the liner 12 is placed in the inner surface of the shell 34 while the liner 12 faces the lower shell 8, as shown in FIG. The fiber waste coming out from the magnetic disk 1 is trapped and prevented from adhering to the magnetic disk 1. Of course, liner 1
1 and the upper shell 7, and between the liner 12 and the lower shell 8, the fibers are formed into elongated holes 15,
It is possible to prevent fiber waste from coming out from the magnetic head 16, and it is possible to prevent fiber waste from gathering near the magnetic head.

Furthermore, by welding the peripheral edge, the central part of the liner 12 bulges toward the magnetic disk 1, bringing the magnetic disk 1 and liner 12 into closer contact, thereby increasing the cleaning effect of the liner 12. can. Although not shown, the liner 11 also produces similar effects. In this invention, in the vicinity of the tongue piece 13 as a biasing means for pressing the liner 12 against the magnetic disk 1,
Since the liner 12 is not welded, the tongue piece 13
The function of the cleaning device is not impaired and the cleaning effect is prevented from deteriorating.

Furthermore, compared to the dot shape shown in FIG. 3, the welding strength can be increased, and the liner can be prevented from shifting due to impact such as when dropped.

Note that this invention may be applied to the case where the liner is brought into contact only with the magnetic surface side of the magnetic disk 1.

[Brief explanation of the drawing]

Figures 1 and 2 are exploded perspective views, top views, and bottom views of an example of a disk cartridge to which this invention can be applied, and Figures 3 and 4 are illustrations of how to install a liner in this disk cartridge. 5 is a plan view and a partially enlarged cross-sectional view used for this invention, and FIG. FIG. 2 is a partially enlarged sectional view of an embodiment of the invention. Explanation of main symbols in the drawings: 1... Magnetic disk, 2... Center plate, 7... Upper shell, 8... Lower shell, 11, 12... Liner, 13... Tongue piece.

Claims (1)

[Scope of claims for utility model registration] The upper shell and the lower shell are combined,
a case in which a head insertion window and a drive shaft insertion window are formed; a disk housed in the case and rotated by the drive shaft; an inner surface of at least one of the disk and the upper shell or the lower shell; A disk cartridge comprising: a liner such as a non-woven fabric interposed between the cartridges; and urging means provided on the inner surface of at least one of the upper shell and the lower shell to urge the liner toward the disk. In the above, the liner is welded to the inner surfaces of the upper shell and the lower shell at the peripheral edge along the contour and the peripheral edge of the head insertion window, and the upper shell or the lower side is provided with the biasing means. A disk cartridge characterized in that the liner is not welded near the inner surface of the shell and does not prevent the urging means from urging the liner against the disk.