JPH09128928A - Magnetic disk cartridge assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable assembling a shutter whose sectional area is made almost a U-shape closing a magnetic head inserting opening without deforming the opening at the time of assembling a magnetic disk cartridge having the magnetic head inserting opening and in which a magnetic disk sheet is housed in a thin box shaped case having a straight line shaped shutter guide grooves on its surface part. SOLUTION: A notch reaching ends of shutter guide grooves 21, 22 is provided at the end part of a case 10. Then, a shutter 13 is assemble to the case 10 by being pushed in a direction in which grooves 21, 22 are extended while putting engaging parts 13a, 13a and 13b in the shutter guide grooves 21, 22 from the side of the case end part in which the notch is formed. Thereafter, a cover member 20 preventing the passage of the engaging parts 13a, 13a and 13b of the shutter 13 is fixed at the notch of the case 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a magnetic disk cartridge in which a magnetic disk sheet is housed in a case and the magnetic disk sheet is rotated at a high speed to be used for magnetic recording and reproduction. More specifically, the present invention relates to a method of assembling a shutter that closes an opening for inserting a magnetic head.

[0002]

2. Description of the Related Art Conventionally, a magnetic disk sheet in which magnetic layers are formed on both sides of a disk-shaped base made of a flexible polyester sheet or the like, and magnetic recording is performed on the magnetic layers by a magnetic head while being rotated at a high speed ( A so-called floppy disk is provided and is mainly used as a recording medium for a computer because of its advantages such as easy handling and low cost.

Recently, a magnetic disk sheet of this type is typified by a so-called 3.5 inch type.
It is often used as a magnetic disk cartridge by being rotatably housed in a thin hard case. The case is basically formed in a thin box shape by a bottom plate, a top plate arranged to face the bottom plate, and side plates connecting the bottom plate and the peripheries of the top plate. In many cases, the two shell halves are fixed to each other in a lid-matching manner.

In a magnetic disk cartridge of the type using this hard case, an opening for inserting a magnetic head is provided in the case. In the 3.5-inch type magnetic disk cartridge or the like, the opening for inserting the magnetic head is provided so as to face the end portions of the bottom plate and the top plate of the case. Further, this magnetic head insertion opening is generally closed by a shutter when the cartridge is not used, in order to prevent dust in the case. As this shutter, a shutter having a substantially U-shaped cross section is often used, which is assembled in the case with a part of the case being sandwiched.

In many cases, a shutter guide groove extending in one direction is formed on the surface of the bottom plate or the top plate of the case, and the shutter is provided with an engaging portion slidably engaged with the shutter guide groove. To be As a result, the shutter is prevented from coming off from the case, and can be moved along the shutter guide groove to open and close the magnetic head insertion opening.

Conventionally, in order to assemble a shutter having a substantially U-shaped cross section as described above into a case, as shown in FIG. 6, the shutter 2 is pushed into the case 1 from the side opposite to the end on the bending side. The method has been used. In FIG. 6, 3 is a shutter guide groove formed in the case 1, and 4 is a shutter guide groove.
Is an opening for inserting a magnetic head, 5 is a magnetic disk sheet, 6
Is an engaging portion (guide claw portion) that protrudes toward the inside of the shutter 2. When the shutter 2 is assembled at a predetermined position of the case 1, the engaging portion 6 enters the shutter guide groove 3 and both are engaged. To meet.

[0007]

When the shutter 2 is assembled to the case 1 as described above, the engaging portion 6 of the shutter 2 is designed to be able to ride over the case portion between the case end surface 1a and the shutter guide groove 3. In addition, it is necessary to push the shutter 2 while forcibly opening it in the direction of arrow Q.

However, in such a case, when the shutter 2 is made of a material that is easily plastically deformed, the opening habit may remain in the shutter 2. Then, the engaging portion 6 of the shutter 2 and the shutter guide groove 3
And the shutter 2 is easily disengaged from the case 1.

The above-mentioned problems are caused especially by the large case thickness and the deep shutter guide groove 3, and the engaging portion 6 correspondingly.
Is noticeable when the height is relatively high. That is, in this case, it is necessary to open the shutter 2 further so that the high engaging portion 6 can ride over the case portion outside the shutter guide groove 3.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of assembling a magnetic disk cartridge in which a shutter having a substantially U-shaped cross section can be assembled in a case without being deformed.

[0011]

A method of assembling a magnetic disk cartridge according to the present invention comprises a case as described above,
In a method of assembling a magnetic disk cartridge comprising a magnetic disk sheet and a shutter having an engaging portion slidably engaged with a shutter guide groove of the case and having a substantially U-shaped cross section, an end of the case is provided. Is provided with a notch that reaches one end of the shutter guide groove, and the shutter extends from the case end portion side where the notch is formed while accommodating the engaging portion in the shutter guide groove. It is characterized in that it is pushed in the direction and assembled to the case, and thereafter, a cover member for preventing passage of the engaging portion of the shutter is fixed to the cutout portion of the case.

The present invention also provides a magnetic disk cartridge obtained by the above assembling method. The magnetic disk cartridge slides on the case, the magnetic disk sheet, and the shutter guide groove of the case as described above. In a magnetic disk cartridge including a shutter having an engaging portion that freely engages and formed in a substantially U-shaped cross section, a notch is formed at an end portion of a case to reach one end of a shutter guide groove. A cover member that prevents passage of the shutter engagement portion is fixed to the cutout portion.

[0013]

In the method of assembling the magnetic disk cartridge according to the present invention, the shutter having a substantially U-shaped cross section is housed in the shutter guide groove from the case end side where the notch is formed. Since it is pushed in the direction in which the groove extends and assembled to the case, it is not necessary to forcibly open the shutter.

That is, in this case, since the engaging portion of the shutter is housed from the groove end side with respect to the shutter guide groove,
It is not necessary to deform the shutter so that the engaging portion crosses a part of the case. Therefore, the shutter having a substantially U-shaped cross section can be assembled to the case without being deformed, so that the engagement between the shutter engagement portion and the shutter guide groove can be maintained well, and the shutter can be securely held by the case. Become.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 2 and 3 respectively show the magnetic disk cartridge assembled according to the embodiment of the present invention as viewed from the top and bottom sides, and FIG. 1 shows the case portion of the magnetic disk cartridge. ing.

As shown in FIGS. 2 and 3, a center core 11 is rotatably held in a hard case 10 formed of, for example, a synthetic resin.
A magnetic disk sheet 12 having a central circular hole is fixedly attached thereto using, for example, an adhesive. This magnetic disk sheet 12 is a disk-shaped base made of a flexible polyester sheet or the like, on which magnetic layers are formed.

The thin box-shaped hard case 10 is made up of two shell halves 14 and 15 fixed to each other in a lid-like manner. In this example, the shell half 14 has a bottom plate 14a and side plates 14b.
And the shell half 15 constitutes a top plate 15a and a side plate 15b. That is, the bottom plate 14a of the shell half 14 and the top plate 15a of the shell half 15 face each other, and the peripheries thereof are connected by the side plates 14b and 15b to form the box-shaped hard case 10. FIG.
As is clearly shown in Fig. 1, the shell halves 14 and 15 have a partially cutout shape, and a gutter-shaped cover with one end (the front end in Fig. 1) closed at that part. The members 20 are joined by ultrasonic welding or the like. The cover member 20 will be described in detail later.

As clearly shown in FIGS. 1 and 3, the bottom plate 14a of the shell half 14 is provided with a center core hole 14c. A spindle hole 11a is formed in the center core 11, and when the magnetic disk cartridge is loaded in the disk drive device, the drive spindle of this disk drive device passes through the center core hole 14c and the spindle hole 11a. Engage with.

Further, the hard case 10 is formed with a magnetic head insertion opening by cutting out a part of each of the bottom plate 14a, the side plates 14b and 15b, and the top plate 15a. That is, this magnetic head insertion opening is composed of an opening 16 formed in the bottom plate 14a, an opening 17 formed in the side plates 14b and 15b, and an opening 18 formed in the top plate 15a.

The hard case 10 is fitted with a shutter 13 for closing the magnetic head insertion openings 16, 17, 18 and the center core hole 14c. The shutter 13 has a substantially U-shaped cross section, and is formed of a metal plate such as a stainless steel plate or an aluminum plate or a plastic such as polyacetal resin. The shutter 13 is assembled to the hard case 10 as follows.

A first shutter guide groove 21 extending linearly in one direction is formed in a portion of the bottom plate 14a between the magnetic head insertion opening 16 and the center core hole 14c. Further, at a portion of the bottom plate 14a which is apart from the magnetic head insertion opening 16 in the shutter moving direction (the left-right direction in FIG. 3), a second portion extending in parallel with the first shutter guide groove 21 is formed.
The shutter guide groove 22 is formed. The second shutter guide groove 22 is provided at a position close to the side plates 14b and 15b. The first shutter guide groove 21 and the second shutter guide groove 22 are formed to extend to the side end surface of the bottom plate 14a to which the cover member 20 is joined.

On the other hand, the shutter 13 is provided with a pair of guide claw portions 13a, 13a slidably engaged with the first shutter guide groove 21, and slidably with respect to the second shutter guide groove 22. A guide claw portion 13b to be engaged is provided.
The guide claw portions 13a and 13a, which are the first engaging portions, respectively,
The shutter 13 is formed by making a U-shaped cut in a part of the shutter 13 and bending a portion surrounded by the cut inward. The guide claw portion 13b, which is the second engaging portion, is also formed in the same manner as above. These guide claws 13a, 13a and 13
When the shutter 13 is made of plastic, b can be provided by injection molding instead of bending as described above.

As shown in FIG. 1, the shutter 13 having the above-described structure has a shell half from the end on the side of the notch 35 where the cover member 20 is joined, before the cover member 20 is joined to the shell half 14, 15. It is assembled on 14 and 15. At this time, in the shutter 13, the guide claw portions 13a, 13a are aligned with the first shutter guide groove 21, and the guide claw portion 13b is aligned with the second shutter guide groove 22, and the shutter guide groove 21, It is pushed in the direction of extension of 22. Then, the guide claw portions 13a, 13a enter the first shutter guide groove 21 from the end side thereof, and the guide claw portion 13b also enter the second shutter guide groove 22 from the end side thereof. Can be easily assembled with the shell halves 14, 15.

The shutter 13 assembled in such a manner as to sandwich a part of the shell halves 14 and 15 has a guide claw portion.
The shutter guide grooves 13 and 13a are guided by the shutter guide grooves 21 and 22, respectively.
It becomes movable along 21 and 22.

After that, shell half 14 and shell half 15
A cover member 20 having the same total thickness as the above is joined to the cutouts 35 of the shell halves 14 and 15. As a result, when the shutter 13 is largely moved along the shutter guide grooves 21 and 22 toward the cover member 20, the shutter 13 comes into contact with the end surface 20a of the cover member 20 and is prevented from slipping off from the shell halves 14 and 15. It

The shutter 13 is biased in the direction of arrow A by a spring (not shown) arranged in the hard case 10, and normally has a step 14f formed on the bottom plate 14a and a top plate 15a.
The state of abutting on the stepped portion 15f formed at is maintained. Therefore,
This shutter 13 is used for magnetic head insertion openings 16, 17 and 18
Will be closed, and foreign matter such as dust and dust will be
Intrusion into the inside of 10 is prevented.

The shutter 13 has a hole 14c for the center core.
It may be formed to be relatively short so as not to reach. However, it is preferable to form the shutter 13 long so as to close not only the magnetic head insertion opening 16 but also the center core hole 14c as in this example, because a more reliable dustproof effect can be obtained.

The magnetic disk cartridge having the above structure is
By inserting the disc drive device in the direction of arrow B, the disc drive device is loaded. During this loading operation, the shutter 13 is moved to the open position (the position where it abuts the end surface 20a of the cover member 20) by a known mechanism, and the two openings of the magnetic disk insertion device are opened from the magnetic head insertion opening 17 thus opened. The magnetic heads 30a and 30b enter. Then, one of the magnetic heads 30a moves in the magnetic head insertion opening 16 and comes into a state of being in contact with or close to the magnetic disk sheet 12 as it is. The other magnetic head 30b moves in the magnetic head insertion opening 18 and comes into contact with or close to the magnetic disk sheet 12 as it is. As mentioned above, in this magnetic disk cartridge,
It is not necessary to operate the magnetic heads 30a and 30b across the case portion.

As described above, the shutter 13 of this magnetic disk cartridge is assembled to the shell halves 14 and 15 from the end side of the shutter guide grooves 21 and 22 without forcibly opening it. The shutter 13 will not be deformed due to this assembly. Therefore,
Engagement of the guide claws 13a, 13a with the first shutter guide groove 21, and the guide claw 13b with the second shutter guide groove
Good engagement with 22 and shutter 13 in hard case
Be sure to be held at 10.

Further, in this magnetic disk cartridge, the first shutter guide groove 21 has the opening for inserting the magnetic head.
Since it is formed so as to extend between 16 and the center core hole 14c, the first shutter guide groove 21 is not divided by the magnetic head insertion opening 16. Therefore, the pair of guide claw portions 13a, 13a of the shutter 13 does not come off the shutter guide groove 21 as the shutter moves, and the operation of the shutter 13 becomes stable.

If the guide claws 13a, 13a are not separated from the shutter guide groove 21, the case portion at the end of the shutter guide groove 21 is prevented from being scraped by the guide claws 13a, 13a. It

In the magnetic disk cartridge of this embodiment, since the second shutter guide groove 22 is formed at the position as described above, the guide claw portion 13b which engages with the second shutter guide groove 22 is It is formed in a portion extremely close to the end of the shutter 13 on the bent side. This portion of the shutter 13 is much less likely to be elastically deformed than the portion near the tip of the shutter 13 (the end portion on the far side in FIG. 1) or the like, so the guide claw portion 13b should be removed from the second shutter guide groove 22. Is extremely unlikely to occur, so that the shutter 13 is reliably prevented from falling off the hard case 10.

In order to prevent the shutter 13 from falling off from the hard case 10, the shutter 13 is formed in a shape such that the gap on the front end side is narrowed as shown in FIG. When the vicinity of the portion where 13a, 13a is formed and the portion facing it are pressed against the shell halves 14 and 15, the guide claw portions 13a and 13a are less likely to come off from the first shutter guide groove 21, which is effective. Is.

In the embodiment described above, the long gutter-shaped cover member 20 is used, but as shown in FIG.
The first shutter guide groove 21 and the second of the hard case 10
It is also possible to form relatively small notches 36 and 37 corresponding to the respective shutter guide grooves 22 and fix relatively short cover members 41 and 42 to these notches 36 and 37, respectively.

It should be noted that the above-mentioned cover members 41 and 42 are provided with overhanging portions 41a, which are inserted between the shell halves 14 and 15, respectively.
42a is provided. Such overhang portions 41a, 42a
If they are joined to the shell halves 14 and 15, respectively, the cover members 41 and 42 will be more reliable.
And stick. Such an overhanging portion can be appropriately provided in the gutter-shaped cover member 20 shown in FIG.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of a magnetic disk cartridge assembled by the method of the present invention.

FIG. 2 is a plan view showing an upper surface side of the magnetic disk cartridge.

FIG. 3 is a plan view showing the bottom side of the magnetic disk cartridge.

FIG. 4 is a side view showing another example of a shutter that can be used in the present invention.

FIG. 5 is a partial perspective view showing another example of the magnetic disk cartridge assembled by the method of the present invention.

FIG. 6 is an explanatory diagram illustrating a conventional method for assembling a magnetic disk cartridge.

[Explanation of symbols]

 10 Hard case 11 Center core 12 Magnetic disk sheet 13 Shutter 13a Shutter guide claw (first engaging part) 13b Shutter guide claw (second engaging part) 14, 15 Shell half 14a Shell half bottom Face plate 14b Shell half side plate 14c Shell half center core hole 15a Shell half top plate 15b Shell half side plate 16, 17, 18 Magnetic head insertion opening 20 Cover member 21 First shutter guide groove 22 Second shutter Guide grooves 30a, 30b Magnetic heads 35, 36, 37 Notches 41, 42 Cover members 41a, 42a Cover member protrusions

Claims (2)

[Claims] 1. A case, which is formed in a thin box shape, has an opening for inserting a magnetic head, and has a linear shutter guide groove on its surface, and a disk-shaped magnetic disk sheet rotatably accommodated in this case. And a portion having an engaging portion that slidably engages with the shutter guide groove and having a substantially U-shaped cross section, and being assembled to the case with a part of the case sandwiched therebetween. A method for assembling a magnetic disk cartridge comprising a shutter that moves along the shutter guide groove to open and close the opening for inserting the magnetic head, wherein the end portion of the case reaches one end of the shutter guide groove. A cutout is provided, and the shutter is extended in a direction in which the engagement portion is housed in the shutter guide groove from the case end portion side where the cutout is formed while the groove extends. Assembling crowded the case, then the notch portion of the case, the assembling method of a magnetic disk cartridge, characterized by fixing the cover member to prevent passage of the engaging portion of the shutter. 2. A case which is formed in a thin box shape, has a magnetic head insertion opening, and has a linear shutter guide groove on its surface, and a disk-shaped magnetic disk sheet rotatably accommodated in this case. And a portion having an engaging portion that slidably engages with the shutter guide groove and having a substantially U-shaped cross section, and being assembled to the case with a part of the case sandwiched therebetween. In a magnetic disk cartridge comprising a shutter that moves along the shutter guide groove to open and close the magnetic head insertion opening, a notch is formed at an end of the case and reaches one end of the shutter guide groove. A magnetic disk cartridge characterized in that a cover member for preventing passage of an engaging portion of the shutter is fixed to the cutout portion.