JPS6142792A - Disk cartridge - Google Patents

Abstract

PURPOSE:To clean a magnetic disk effectively without a complicated constitution of a recording and reproducing device by abutting a cleaning member to the magnetic disk through a pressing body for moving in correspondence to a shutter for a magnetic head insertion port. CONSTITUTION:When a disk cartridge is mounted on a recording and reproducing device, a shutter 2 moves to open a magnetic head insertion port 5. Acting in correspondence to the moving of the shutter 2 with a guide groove 12 of an upper case 1a along a projection 2a, a pressing body 3 moves downward, and accordingly cleaning sheets 8 and 9 abut both surfaces of a magnetic disk 4. As a result, it is unnecessary to provide a drive pin, etc., on the recording and reproducing device, and therefore the magnetic disk can be effectively cleaned without the complicated constitution of said device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge such as a magnetic disk cartridge, and particularly to a disk cartridge in which a magnetic disk is rotatably housed in a hard case.

[Conventional technology]

Flexible disk cartridges that house magnetic disks in cases made of polyvinyl chloride sheets have been known for some time, but these cartridges can bend or warp during handling or storage.
This resulted in poor contact between the magnetic disk and the magnetic head, resulting in deterioration in recording and reproducing characteristics. Therefore, in recent years, disk cartridges have been provided in which a magnetic disk is rotatably housed in a box-shaped hard case made of synthetic resin or the like.

Although disk cartridges using this hard case do not undergo the same deformation as flexible disk cartridges, they are not without some problems.

In other words, since the case is made of a molded object such as synthetic resin, there is inevitably a gap between the thin film-like magnetic disk and the case, and even if a cleaning member is attached to the inside of the case, there will be a gap between the magnetic disk and the magnetic disk. This causes problems such as incomplete contact or no contact at all. For this purpose, for example, as shown in Japanese Patent Application Laid-Open No. 58-224478, a pressing body for cleaning the magnetic disk is held at an appropriate position of the hard case, and when the disk cartridge is loaded into the recording/reproducing device, recording/reproducing An apparatus is known in which a drive bottle provided in the apparatus brings a pressing body into pressure contact with the surface of a magnetic disk, thereby cleaning the magnetic disk.

In such conventional disk cartridges, the pressing body is forcibly pressed against the surface of the magnetic disk by a drive bin provided inside the recording/playback device, so a stable cleaning effect can be obtained, but it is not necessary to provide a drive bin inside the recording/playback device. This has the disadvantage that the drive mechanism of the recording/reproducing device becomes complicated.

[Problems to be Solved by the Invention] The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art and provide a disk cartridge that can reliably provide cleaning effects on magnetic disks without complicating the structure of the recording/reproducing device. There is something to do.

[Means for solving problems]

The present invention utilizes a shutter that opens and closes a magnetic head insertion port provided in a case, and when the shutter is opened, a pressing body is pressed and moved by the shutter, and the movement of the pressing body moves a cleaning member to the surface of the magnetic disk. A point configured to be in pressure contact with a special voltage is defined as a special voltage.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a disk cartridge according to a first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along the line A-A in FIG. 1, in which 1 is a cartridge case, 2 is a shutter,
3 is a pressing body, and 4 is a magnetic disk.

The cartridge case 1 is composed of an upper case 1α and a lower case 1b, which are molded from a hard material such as synthetic resin or metal. A magnetic head insertion opening 5 is formed in a predetermined position of the cartridge case 1, and a magnetic disk 4 is rotatably housed inside the cartridge case 1. This magnetic disk 4 is made of a base film with magnetic layers coated on both sides, as is known in the art.
An insertion hole 6 into which a drive shaft (not shown) of a recording/reproducing device is inserted is formed in the center of the insertion hole 60.
The peripheral edge faces into the center hole 7 of the cartridge case 1.

As shown in FIG. 2, a pair of cleaning sheets 8.9 are disposed between the magnetic disk 4 and the upper case 1α and between the magnetic disk 4 and the lower case 1h. The cleaning sheet 8 is partially heat-sealed to the upper case 1α.

An opening 10 having a rectangular planar shape is formed in the vicinity of the magnetic head insertion opening 5 of the upper case 1α, and the pressing body 3 is fitted into the opening 10 so as to be movable up and down. This pressing body 3
is molded from a synthetic resin with a small coefficient of friction such as polyacetal resin, and has a tapered surface 3α on its upper surface and a flange 3b on its lower part, and the flange 3hK prevents it from falling off from the upper case 1α. It has become. Note that the cleaning sheet 8 near the bottom surface of the pressing body 3
is not fused to the upper case 1α, so that the pressing body 3 can freely move up and down within the opening 10.

A shutter 2 having a U-shaped cross section is slidably fitted onto the upper case 1α and the lower case 1b, and the shutter 2 has a rectangular planar shape that is somewhat thicker than the magnetic head insertion opening 5. A head window 11 is provided. A pair of embossed protrusions 2cL are formed on the upper surface of the shutter 2, while a magnetic head insertion port 5 and an opening 1 of the upper case 1a are formed.
A pair of guide grooves 12 are formed between the two protrusions 2 and 2.
α is 5 so that it is guided by both guide grooves 12. The shutter 2 is always biased in the closing direction, that is, toward the right in FIG. Closed. Then, when the disk cartridge is installed in the recording/reproducing apparatus, the shutter 2 is moved to the left in FIG. The magnetic head insertion port 5 is opened, and the projection 2α is aligned with the tapered surface 3a.
By moving above, the pressing body 3 descends within the opening 10, and the downward movement of the pressing body 3 brings the cleaning sheet 8 into pressure contact with the surface of the magnetic disk 4.

In one embodiment configured in this manner, when the disc cartridge is installed in the recording/reproducing apparatus and the shutter 2 is opened, the pressing body 3 is pressed against the protrusion 2α of the shutter 2.
is pressed in the direction of the magnetic disk 4, and as a result, the pressing body 3
The cleaning sheet 8.9 located below clamps both surfaces of the magnetic disk 4 with a predetermined force. When the magnetic disk 4 is rotated in this state, a portion of the magnetic disk 4 corresponding to the recording band is thoroughly cleaned by both cleaning sheets 8 and 9. And shutter 2
When closed, protrusion 2. Since α separates from the tapered surface 3α and the pressing force on the pressing body 3 is released, both cleaning sheets 8.9 come into contact with the magnetic disk 4 with light pressure, and therefore the cleaning sheets 8.9 Dust and the like that have adhered to the magnetic disk 4 will not re-adhere to the magnetic disk 4.

FIG. 3 is a sectional view of a main part showing a second embodiment of a disk cartridge according to the present invention, in which 13 is an elastic body;
Portions corresponding to those in FIG. 2 are given the same reference numerals.

This embodiment differs from the first embodiment described above in that the pressing body 3
An elastic body 13 made of sponge or the like is interposed between the lower surface of the cleaning sheet 8 and the upper cleaning sheet 8, and the pressing body 3 is urged upward by the elastic force of the elastic body 130.

In this embodiment, the shutter 2
When the protrusion 2α moves on the tapered surface 3α with the opening operation, and the pressing body 3 is thereby pressed in the direction of the magnetic disk 4, the elastic body 13 disposed on the lower surface of the pressing body 3 is compressed. The pressure is propagated to the cleaning sheet 8 and the magnetic disk 4 is compressed. Therefore, even if some dimensional error occurs in the shape of the protrusion 2α or the inclination of the tapered surface 3α, such variation can be absorbed by the elastic body 13, and therefore the variation in the pressing force acting on the magnetic disk 4 can be reduced. The cleaning effect can be further improved.

FIG. 4 is a sectional view of main parts showing a third embodiment of a disk cartridge according to the present invention, and parts corresponding to those in FIG. 3 are given the same reference numerals.

In FIG. 4, reference numeral 14 denotes an elastic body made of a leaf spring, which is bent into a dogleg shape and fixed to the upper surface of the pressing body 3. As shown in FIG. When the shutter 2 is released from the illustrated closed position, the elastic body 14 is pressed and deformed by the shutter 2, and the pressing body 3 is pressed by the elastic body 14, thereby pressing the cleaning sheet 8 against the magnetic disk 4. In this case as well, the elastic body 1
Since the pressing force acts on the magnetic disk 4 through the magnetic disk 4, the pressing force on the magnetic disk 4 can be stabilized.

In both the second and third embodiments described above, the elastic bodies 13 and 14 were provided on the pressing body 3 side, but the fifth embodiment
Even if such an elastic body is provided on the shutter 2 side as shown in the figure, the same effect can be achieved.

That is, in FIG. 5, reference numeral 15 denotes an elastic body made of a filigree spring, which is fixed to the inner surface of the shutter 2 by welding or the like. This elastic body 15 moves inside the guide groove 12 and the tapered surface 3LX of the pressing body 3 as the shutter 2 is opened.
The pressing body 3 is pressed by the resilient force of the elastic body 150, and the cleaning sheet 8 is pressed against the magnetic disk 4.

In this case as well, since the pressing force acts on the magnetic disk 4 via the first elastic body 15, the pressing force on the magnetic disk 4 can be stabilized.

FIG. 6 is a plan view of the shutter 2 showing an embodiment in which the elastic body 15 is integrally formed with the shutter 2, and FIG. 7 is a plan view of the shutter 2 shown in FIG.
This is a sectional view taken along line B, and shows that an elastic body 16 is integrally formed on the shutter 2 by press working or the like. In this case, since the work of welding the elastic body 16 can be omitted, the structure can be made simpler than the embodiment shown in FIG.

In each of the embodiments described above, the upper cleaning sheet 8 is partially heat-sealed to the upper case 1α, but the cleaning member according to the present invention is not limited to this. For example, as shown in FIG. 8, the upper cleaning sheet 8 is attached to a disk-shaped substrate 18 made of a relatively hard material such as a synthetic resin or a thin metal plate and has a notch 17 in a part, and the substrate 18 is cut out. The part 17 is arranged between the upper case 1α and the magnetic disk 4 so that it is located at a part corresponding to the magnetic head insertion opening 5 of the cartridge case 1, and the pressing body 3 is inserted through the substrate 18 as shown in FIG. The cleaning sheet 8 may be configured to be pressed against the magnetic disk 4. In this case, since the pressing force from the pressing body 3 is propagated to the cleaning sheet 8 over a wide area via the substrate 18, the pressing force on the magnetic disk 4 is dispersed, and a disk cartridge with stable rotational torque can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, the pressing body is moved using the shutter that opens and closes the magnetic head insertion port, and the cleaning member is brought into pressure contact with the surface of the magnetic disk by the pressing body. Even if the device does not have a special mechanism for driving the pressing body, the cleaning effect on the magnetic disk can be reliably achieved.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings all show embodiments of the present invention, and FIG. 1 is a plan view of a disk cartridge, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a disk cartridge. FIG. 4 is a cross-sectional view of the main part showing still another embodiment of the disc cartridge. FIG. 5 is a sectional view of the main part showing still another embodiment of the disc cartridge. Sectional view, No. 6
The figure is a plan view showing another embodiment of the shutter, and FIG.
FIG. 8 is a plan view of the board, and FIG. 9 is a sectional view of main parts showing still another embodiment of a disk cartridge using the board shown in FIG. 8. 1... Cartridge case, lα...
Upper case 1b-°-...Lower case, 2...Yu shutter, 2α...Protrusion, 3...Press body, 3
cL...Theba, 3b...Tsubabe, 4
...Magnetic disk, 5...Magnetic head insertion slot, 6...Insertion hole, 7...Center hole, 8.9... Cleaning sheet, 10...
...Opening, 11...Head window, 12
... From... Guide groove, 13, 14. 15. 16...
...Elastic body, 17...Notch, 18...
·substrate. 2: Ja・,/7 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A disk cartridge comprising a hard case having a magnetic head insertion port, a magnetic disk rotatably housed in the case, and a cleaning member disposed between the surface of the magnetic disk and the inner surface of the case. A shutter capable of opening and closing the magnetic head insertion port is provided in the case, and a pressing body that contacts the cleaning member is movably disposed in the case, and when the shutter is opened, the pressing body is pressed by the shutter. A disk cartridge characterized in that the cleaning member is moved by pressing, and the cleaning member is brought into pressure contact with the surface of the magnetic disk by the movement of the pressing body.