JPH03183076A - Magnetic disk cartridge - Google Patents

Abstract

PURPOSE:To remove foreign objects such as dust, etc., sticked to the surface of a jacket with the move of a shutter by providing a driving means in a magnetic disk cartridge. CONSTITUTION:Crimping parts 217a and 217b of a clip 211 get contact with ribs 231a and 231b to be formed in the internal part of a magnetic disk cartridge 100 and by these ribs 231a and 231b, the crimping parts 217a and 217b are pushed to a magnetic disk 121 side and crimp the end parts of the magnetic disk 121. In such a state, since the clip 211 is moved by a slide pin 301, the magnetic disk 121 is rotated by a prescribed amount. A shutter 151 opens head inserting ports 103 and 113 with the insertion of the magnetic disk cartridge 100 into a drive device. At such a time, the foreign objects such as dust, etc., sticked onto the surfaces of jackets 101 and 111 of the cartridge 100 fall down from the head inserting ports 103 and 113 onto the surface of the magnetic disk 121 by the end part of the shutter 151.

Description

Detailed Description of the Invention [Object of the Invention (Field of Industrial Application) The present invention relates to a magnetic disk cartridge, and in particular to an AB
The present invention relates to a magnetic disk cartridge in which a magnetic disk is rotatably housed in a jacket made of S resin or the like.

(Prior Art) In recent years, with the spread of word processors and personal computers, many magnetic disk cartridges, in which a magnetic disk is rotatably housed in a jacket made of ABS resin, etc., have come on the market as external recording devices. Ta.

Therefore, a magnetic disk cartridge using a 3.5-inch disc-shaped magnetic disk will be explained as an example.

This magnetic disk cartridge has a magnetic disk with a metal hub installed in the center thereof housed in a pair of jackets made of a synthetic resin with high strength such as ABS resin.

A rectangular head insertion opening is formed in the pair of jackets for bringing the magnetic head into contact with the magnetic disk, and a hub exposure opening for exposing the hub is formed in one of the jackets. .

In order to prevent foreign matter such as dust from entering through the rectangular head insertion opening, a shutter having a U-shaped cross section is installed so as to be movable on one side of the jacket. This shutter is normally biased in one direction by a spring to seal the head insertion port, and when attached to the drive device operates to open the head insertion port.

Further, a liner made of non-woven fabric is attached to the magnetic disk holding surfaces of the pair of jackets described above in order to remove foreign matter such as dust adhering to the surface of the magnetic disk. Further, a lifter is installed between the liner and the jacket to press the liner toward the magnetic disk, thereby configuring the magnetic disk cartridge.

Incidentally, in recent years, there has been an increasing demand for magnetic disk cartridges such as those described above to have larger recording capacities and faster transfer speeds.

Therefore, attempts have been made to improve the recording density in the track width direction using servo technology and increase the relative speed between the magnetic disk and the magnetic head to improve the transfer speed.

(Problems to be Solved by the Invention) As mentioned above, as the track width of a magnetic disk cartridge is made finer and the relative speed between the magnetic disk and the magnetic head is increased, fine dust particles, which were not a problem in the past, are generated. Even foreign objects such as these can easily damage one track and cause errors such as dropouts.

When we investigated the mechanism of errors caused by foreign matter such as dust, we found that many errors occur when chucking magnetic disk cartridges.

In other words, foreign matter such as dust attached to the surface of the magnetic disk cartridge may enter the inside of the magnetic disk cartridge through the head insertion port by the shutter edge as it moves when the shutter is opened, or by sliding between the shutter and the jacket surface. Sometimes I put it away. If foreign matter such as dust that has entered the inside of the magnetic disk cartridge in this way adheres to the surface of the magnetic disk, when the magnetic head is brought into contact with the magnetic disk, the foreign matter such as dust will be placed between the magnetic head and the magnetic disk. This may result in a state in which the magnetic head is caught in the magnetic head, or in a state in which foreign matter such as dust is caught in the gap portion of the magnetic head. This may lead to various problems such as insufficient magnetic writing on the surface of the magnetic disk or damage to the surface of the magnetic disk.

In order to solve the problem caused by foreign matter such as dust entering the inside of the magnetic disk cartridge due to the movement of the shutter, for example, Japanese Utility Model Application Publication No. 58-140571 discloses a technique for filling the vicinity of the head insertion opening. has been done.

However, there is a physical limit to suppressing foreign matter such as dust that enters from the head insertion port due to such exhaustion, and it cannot be said to be effective.

The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a magnetic disk cartridge with fewer errors such as dropouts even when used under conditions such as narrow track width and high speed rotation. .

[Structure of the Invention] (Means for Solving the Problems) The magnetic disk cartridge of the present invention includes a disk-shaped magnetic disk capable of recording/reproducing information, and a drive unit installed in the center of the magnetic disk and chatting with a drive device. A magnetic disk is rotatably housed by a hub that can be rotated, a hub exposure port that exposes the hub, and a head insertion port that partially exposes the magnetic disk so that a magnetic head of a drive device can contact the magnetic disk. a storage means; a cleaning member installed on a surface of the storage means that holds the magnetic disk;
The present invention is characterized by comprising a shutter means movably installed to open and close the head insertion port, and a drive means for rotating the magnetic disk before the magnetic head of the drive device comes into contact with the magnetic disk.

(Function) As a result of research, the present inventors have found that errors in magnetic disk cartridges can be reduced by creating a configuration that includes a drive means for rotating the magnetic disk before the magnetic head contacts the magnetic disk, as described above. I found out what I can do.

That is, by rotating the magnetic disk by a drive means before the magnetic head contacts the magnetic disk surface of the magnetic disk cartridge, foreign matter such as dust can enter from the magnetic head insertion port and adhere to the magnetic disk surface. too,
Since the region from which foreign matter such as dust has been sufficiently removed by the liner is exposed from the head insertion port, there is no possibility that foreign matter such as dust will be caught in the gap portion of the magnetic head.

The driving means for rotating the magnetic disk can be easily configured by operating in conjunction with insertion of the magnetic disk cartridge into the drive device.

As for the driving means, various configurations are possible, such as one that is linked to the movement of the shutter, but since the magnetic disk exposed from the head insertion hole needs to be sufficiently cleaned by the liner, the movement of the shutter is It is preferable that the magnetic disk is rotated slightly even after completion of the process. For this reason, the driving means is not linked to the movement of the shutter, but is driven by other means unrelated to the movement of the shutter, such as when inserting a magnetic disk into the drive device, the drive means is moved in conjunction with the engaging part of the drive device. It is better to use it as a mechanism.

In addition, this driving means may be one that directly holds and rotates the magnetic disk, or one that indirectly rotates the magnetic disk by driving a hub part, but it is possible to indirectly drive the magnetic disk. For this purpose, the mechanism may become complicated, so for small magnetic disk cartridges such as 3.5-inch size, it is preferable to use a type that directly holds and rotates the magnetic disk.

Hereinafter, one embodiment of the present invention will be explained by showing a specific example.

(Example) Hereinafter, a magnetic disk cartridge according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic perspective view of a magnetic disk cartridge (1) of this embodiment, and FIG. 2 shows an exploded perspective view of this magnetic disk cartridge (1).

The magnetic disk cartridge (1) of this embodiment has an ABS
A pair of upper and lower jackets (101) made of resin.

A disk-shaped magnetic disk (121) is rotatably housed inside (111).

In this example, a magnetic disk (121) including a magnetic layer formed by dispersing Co--Ti substituted barium ferrite magnetic powder in a resin was used.

The magnetic disk (121) has a size of 3.5 inches, and has a metal hub (131) installed at its center that can be easily chucked into a drive device (not shown). This hub (131) has a flat surface in which a center hole (137) and a retaining hole (139) are formed into which a center pin (not shown) and an engagement pin (not shown) formed in the drive device are inserted. It consists of a chucking part (133) and a flange part (135) that holds the magnetic disk (121).

The pair of upper and lower jackets (101) and (111) have
A rectangular head insertion slot (103) for bringing the magnetic head of the drive device into contact with the magnetic disk (121).
.

(113) is formed, and the lower jacket (111)
A hub exposure opening (115) for exposing the hub 031) described above is formed in the hub. In addition, the magnetic disks (
121) Liners (109) and (119) made of non-woven fabric to remove foreign matter such as dust adhering to the surface.
) is installed. And the lower jacket (111)
magnetic disk holding side (lla) and liner (119)
between the liner (11, 9) and the magnetic disk (12
1) is provided with a glue lid (141) for pressing.

In order to prevent foreign matter such as dust from entering the magnetic disk cartridge (1) from the outside, the head insertion ports (103) and (113) are normally closed, and when installed in a drive device, the head insertion ports (103) and (113) are closed. (ioa).

(113) is opened and the magnetic head moves to the magnetic disk (121).
A shutter (151) having a U-shaped cross section that can come into contact with the jacket (151) is movably installed on the pair of upper and lower jackets (101) and (111). This shutter (151) is connected to the head insertion port <103 by a coil spring (155).
.

(o3) is pressed in the direction of closing, and when installed in the drive device, the shutter (151) is moved by the coil spring (155) by the shutter opening/closing pin (not shown).
Pressed in the installation direction.

And a pair of upper and lower jackets (101), (Ill)
A write-protection tab (1B) is installed at the corner of the magnetic disk (121) so that it can be selectively moved between a state in which information can be recorded and a state in which information cannot be recorded. There is.

Further, a drive means (201) is installed on the side surface of the magnetic disk cartridge (1) to rotate the magnetic disk (121) by a desired angle before the magnetic head contacts the surface of the magnetic disk (121).

To explain this driving means (201) in detail, the pair of upper and lower jackets (101) and (111,) have slits (221a), (221b) and slits (2Ha) on the side surfaces.

(221b) to partially convex ribs (231a) and (231b) inside the magnetic disk cartridge (1)
is formed, and this slit (221a), (
221b), a U-shaped clip (211) as shown in FIG. 3 is movably installed.

This clip (211) is attached to the tip (303) (
The pin receiver that fits into the pin receiver (see Figure 4) has a pin receiver part (213) with a hole (213a) and a slit (221a).

A pair of recesses (215a) that fit into (221b), (
215b) and a pair of clamping parts (217a), (217b) that clamp the magnetic disk (121), and the pair of clamping parts (217a), (217b)
There is a pad (
219a) and (219b) are installed.

These pads (219a) and (219b) are:
It is preferable to use a material made of rubber, sponge, or cloth, which will not cause any damage when holding the magnetic disk (121).

Further, it is preferable that the pads (219a) and (219b) be positioned so as to sandwich the edge of the magnetic disk (121) outside the recording/reproducing area.

The operation of such a magnetic disk cartridge (1), particularly the driving means (201), will be explained with reference to FIGS. 4 and 5. FIG. 5 shows a cross-sectional view taken along the line A-A of the magnetic disk cartridge (1) in FIG. 1, and (a) in FIG. It shows the condition.

When the magnetic disk cartridge (1) is inserted into the drive device, the tip of the magnetic disk cartridge (1) will slide into the slide pin (301) installed on the insertion side of the drive device.
) (see Figure 4) press the rear end (307).

This slide pin (301) is rotatably supported around a rotating shaft (305) on the drive device insertion side, and when the rear end (307) is pressed, the tip (303) is reversely magnetized. Press the side of the disk cartridge (1). Here, in order to prevent the tip and side surfaces of the disk cartridge (1) that press the rear end (307) of the slide bin (301) from being worn out, it is preferable to provide a protection plate for wear prevention.

The tip (303) of the slide pin (301) fits into the hole (213a) of the pin receiver formed in the pin receiver part (21B) of the clip (211), and the clip (211) is inserted into the slit (221a). (22hb). Then, as shown in FIG. 5(a), the clip (
The clamping parts (217a) and (217b) of the clip (211) move in an open state until they reach the ribs (231a) and (23Lb).

As shown in FIG. 5(b), ribs (231a), (
231b) and the holding part (217a) of the clip (211).
.

(217b) are in contact, and this rib (231a), (
231b) by the clamping parts (217a), (217b)
) is pressed toward the magnetic disk (121) and clamps the end of the magnetic disk (121). In this state, clip (
211) is moved by the slide bin (301), so the magnetic disk (121) is rotated by a predetermined amount.

The drive means (20) of this magnetic disk cartridge (1)
The amount of rotation of the magnetic disk (121) in 1) is determined by the length of the ribs (231a) and (231b) formed on the upper and lower jackets (101), <111), that is, the rotation amount of the magnetic disk (121) by the clip (211). ) is determined by the distance traveled by holding and moving the magnetic disk cartridge (1), and must be longer than at least the short side length of the head insertion holes (103) and (113) formed in the magnetic disk cartridge (1).

Then, as the magnetic disk cartridge (1) is further inserted into the drive device, the clip (211) again advances to the area where there are no ribs (231a) and (231b), and the gripping portion ( 21?a),
(217b) releases the magnetic disk (121).

The shutter (151) also opens the head insertion slot (
103) and (113). At this time, the jacket (
101), (111) Foreign matter such as dust attached to the surface of the head insertion port (103) is removed by the end of the shutter (151).
).

(113) onto the surface of the magnetic disk (121).

However, the magnetic disk (121) is moved to the head insertion slot (103) by the operation of the rotating means (201) as described above.
The surface of the magnetic disk (121) exposed from the liners (109) and (113) is an area where foreign matter such as dust is removed by sliding with the liners (109) and (119).

Then, the center bin of the drive device is fitted into the center bin hole (137) of the hub (131), the engagement bottle of the drive device is fitted into the engagement hole (139), and the magnetic head is inserted into the head insertion slot (103). ) and (113) to the surface of the magnetic disk (121), and the rotation of the drive device is transmitted to the magnetic disk (121) in response to recording/reproducing signals.

Also, when removing the magnetic disk cartridge (1) from the drive device, the clip (211) is attached to the slide bin (
301), it is returned to the predetermined position.

The magnetic disk cartridge (1) of this embodiment is configured to include the rotation means (201) as described above, so that when the shutter (151) moves, the jacket (1)
Even if foreign matter such as dust attached to the surface of the magnetic disk (101), (111) falls into the head insertion slot (103), (113), the rotating means (201) will remove the magnetic disk (121).
) are rotated by the desired amount and the liners (109), (1
The area from which foreign matter such as dust has been removed by step 19) is the head insertion port (103).

<113). The magnetic disk (121) in the area where the magnetic head contacts in this way
Since the surface has been cleaned of dust and other foreign matter, there is no possibility that the head will pinch foreign matter such as dust and damage the surface of the magnetic disk (121) during chucking, which is not often seen in the past. We were able to resolve the error during chucking.

In addition, the liner (10) of the magnetic disk cartridge (1)
9) and (119) attract foreign matter such as removed dust, but it may fall onto the surface of the magnetic disk (121) due to vibration or the like. However, as in this embodiment, when chucking, the magnetic disk (121) is removed by a predetermined amount.
By rotating the liner (109), foreign matter such as dust that had fallen on the surface of the magnetic disk (121) is removed again.
, can be removed by (119), so
It is also possible to eliminate the problem that an error occurs immediately after chucking.

In addition, in manufacturing the above-mentioned magnetic disk cartridge (L), after the magnetic disk (121) is housed and sealed in a pair of upper and lower jackets (101) and (111),
From the slits (221a) and (221b) to the clip (
211), it can be easily manufactured.

[Effects of the Invention] As detailed above, in the magnetic disk cartridge of the present invention, by providing the driving means, foreign matter such as dust adhering to the jacket surface as the shutter moves is magnetically moved through the head insertion port. Even if the foreign matter adheres to the disk surface, the magnetic disk can be rotated by a desired amount and the liner can remove foreign matter such as dust. For this reason, the area of the magnetic disk that is exposed during insertion and insertion 7+6 is always in a state where foreign matter such as dust has been removed when the magnetic head comes into contact with it, so when chucking the magnetic disk There is no possibility of foreign objects such as dust being caught between the magnetic head and the magnetic head, damaging the surface of the magnetic disk or causing writing errors on the magnetic disk.

Even in the case of a magnetic disk cartridge with fine track spacing or a magnetic disk cartridge used under high-speed rotation, dropout errors and the like can be sufficiently suppressed and the magnetic disk cartridge can be used with high reliability.

[Brief explanation of drawings]

1 is a schematic perspective view of a magnetic disk cartridge according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the magnetic disk cartridge in FIG. 1, and FIG. 3 is a diagram of a clip of the magnetic disk cartridge in FIG. 1. An enlarged perspective view, FIG. 4 is an enlarged view of the main part showing the insertion state of the magnetic disk cartridge in the drive device in FIG. 1, and FIG.
FIG. 2 is a cross-sectional view of the magnetic disk cartridge taken along line AA in the figure. (1)...Magnetic disk cartridge (1(H), (
111)...-Jacket (103), (113)...
・Head insertion slot (109), (119)...Liner (121)...Magnetic disk (151)...Shutter (201)...Driving means (211)...Clip (221a), ( 221b) , , slit (222
a), <222b) - Rib

Claims (1)

[Scope of Claims] A disk-shaped magnetic disk capable of recording/reproducing information, a hub installed in the center of the magnetic disk and capable of being chucked with a drive device, a hub exposure opening for exposing the hub, and a storage means for rotatably storing the magnetic disk and having a head insertion opening that partially exposes the magnetic disk so that a magnetic head of the drive device can come into contact with the magnetic disk; and the magnetic disk of the storage means. a cleaning member installed on a surface holding the head insertion port; a shutter means installed movably to open and close the head insertion port; What is claimed is: 1. A magnetic disk cartridge characterized by comprising a rotating drive means.