JPH05334846A - Manufacture of magnetic disk cartridge - Google Patents

Abstract

PURPOSE:To keep the depressing pressure of a lifter constant without a variance at every product and to improve a cleaning characteristic by forming the lifter by erecting the other end, while controlling an angle made by one end and the other end of a beltlike body. CONSTITUTION:When peeling mount 38b and a beltlike body 38a are placed on a horn receiving base 121, and a horn 111 is pressed against a horn receiving groove 123, the beltlike body 38a is folded and a lifter is formed. In such a case, an angle made by one end and the other end of the belt-like body 38a is controlled so as to be constant by an erection control jig 101 whose position can be adjusted freely. Accordingly, by using the lifter, pressing force to a liner sheet is kept constant without causing the variance at every product, slender foreign matters on the surface of a disk are also eliminated satisfactorily and the cleaning characteristic is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a magnetic disk cartridge in which a magnetic disk capable of recording / reproducing information is rotatably housed.

[0002]

2. Description of the Related Art In recent years, with the spread of personal computers or personal word processors, magnetic disk cartridges typified by 3.5 inch floppy disks are inexpensive and easy to handle.
It has come to be used many times.

The configuration will be briefly described below by taking a 3.5-inch size floppy disk as an example. This floppy disk comprises a disc-shaped magnetic disk having a magnetic layer formed on a support such as a polyethylene terephthalate (hereinafter abbreviated as PET) film, which is rotatably housed in a pair of upper and lower jackets. There is. At the center of this magnetic disk, a metal hub for transmitting the rotation from the drive device is installed, and at one jacket, a hub exposure port for exposing the hub to the outside is formed. ..

Further, a head insertion opening is formed in each of the upper and lower jackets so that the magnetic head can come into contact with the accommodated magnetic disk. A shutter movable on the jacket is installed by being engaged with the pressing spring so that the head insertion opening is normally closed and is released when the drive device is installed.

A liner sheet made of a non-woven fabric such as acrylic fiber or rayon fiber is installed between the pair of upper and lower jackets and the magnetic disk to remove foreign matters such as dust on the surface of the magnetic disk. In order to press the disk onto the surface of the magnetic disk and improve the cleaning performance on the surface of the magnetic disk, a pressing member made of PET film or stainless is installed between the lower jacket and the liner sheet, and a 3.5 inch size floppy disk is installed. The disc is structured.

[0006]

[Problems to be Solved by the Invention] By the way, 3.
In recent years, there has been an increasing demand for large capacity for magnetic disk cartridges represented by 5 inch size floppy disks. As a method to meet such a demand, there is a high linear density recording by using a high output disk or a narrow track interval utilizing a servo technique, and various researches and developments are being carried out at various places. However, as the recording capacity of the magnetic disk cartridge is increased by these methods, the following problems have become a problem.

That is, since recording / reproducing is performed at a recording density much higher than the conventional one, even if foreign matter such as dust of 0.1 to 1.0 micron which is finer than the conventional one adheres to the disk surface, a sufficient dropout error is caused. It becomes a cause.

In order to solve such a technical problem, the liner sheet has been improved in recent years, and the performance thereof has been improved, but since the control of the pressing force of the lifter was not sufficient, the cleaning property of the liner sheet was improved. It was difficult to improve the manufacturing yield due to variations or variations in running torque. In particular, in a magnetic disk cartridge intended for high-density magnetic recording, the control of the lifter pressing force is restricted to a very narrow range for the purpose of improving cleaning performance. For this reason, it has become important to control the pressing force of the lifter in a magnetic disk cartridge aiming at high density magnetic recording.

The present invention has been made in view of the above problems, and provides a method of manufacturing a magnetic disk cartridge capable of ensuring uniform running torque and cleaning property and greatly improving the manufacturing yield. This is the purpose.

[0010]

According to the present invention, a disk-shaped magnetic disk is rotatably housed in a pair of jackets, and a liner that contacts the magnetic disk and a lifter that presses the liner sheet against the magnetic disk are provided. A method of manufacturing a magnetic disk cartridge, comprising the step of raising the other end of the belt-shaped body to form a lifter while controlling the angle formed by one end and the other end of the flexible belt-shaped body. It is characterized by that.

[0011]

In the method of manufacturing a magnetic disk cartridge according to the present invention, the other end of the belt-shaped body is erected while being controlled by the control means for determining the angle formed by the one end and the other end of the belt-shaped body as described above. The pressure can be kept constant without variation among products. As a result, the manufacturing yield of a magnetic disk cartridge intended for high density recording can be significantly improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a magnetic disk cartridge according to the present invention will be described in detail below with reference to the drawings by taking a 3.5 inch size magnetic disk cartridge as an example.

FIG. 1 is a schematic perspective view of a magnetic disk cartridge (1) of this embodiment, and FIG. 2 is a schematic view of the magnetic disk cartridge (1) taken along the line AA 'in FIG. It is a sectional view.

This magnetic disk cartridge (1) is composed of a pair of upper and lower jackets (11), (31) in which a disk-shaped magnetic disk (41) is rotatably housed. A hub (51) made of metal is fixed to the center of the magnetic disk (41) with an adhesive (not shown). The center hole (53) formed in the center of the hub (51) and the center hole Rotation from a drive device (not shown) is transmitted by an engagement hole (55) formed at a position displaced from (53). An exposure port (35) for exposing the hub (51) to the outside is formed at the center of the lower jacket (31).

Heads for contacting a magnetic head (not shown) of a drive device (not shown) to the surface of the magnetic disk (41) on the pair of upper and lower jackets (11), (31). The insertion port (33) is formed, and in general, in order to prevent foreign matter such as dust from entering through the head insertion port (33), a cross-sectional schematic U-shape that covers the head insertion port (33). A metal shutter (61) is installed.

This shutter (61) is usually a head insertion opening.
When it is chucked by a drive device (not shown) so as to cover (33), the magnetic disk (41) is exposed from the head insertion opening (33) on the jackets (11), (31). Is movably installed by being engaged with a pressing spring (not shown).

Between the pair of upper and lower jackets (11) and (31) and the magnetic disk (41), liner sheets (19) and (39) made of non-woven fabric are installed as shown in FIG. The lower jacket (31) is provided with a PET lifter (37) having one end (37a) installed and the other end (37b) standing upright. In addition, the upper jacket (1
The ribs (13) are arranged on the (1), so that the magnetic disk (41) is sandwiched between the liner sheets (19) and (39) at the intermediate portion between the jackets (11) and (31), and the magnetic disk (41) Foreign matter such as dust on the surface will be removed.

Next, processing of the lifter (37) of the magnetic disk cartridge (1) will be described with reference to FIG. This lifter (37) is processed by the upright control jig (101) as shown in the figure.
(101) is a horn pedestal (121) having a horn (111) for bending the lifter (37) and a groove (123) for receiving the horn.
And a standing control unit (131) extending from the horn cradle (121).

This standing control unit (131) is provided with a horn cradle (1
The vertical distance from the 21) is finely adjusted. First, as shown in FIG. 3 (a), the horn pedestal (121) is used.
And the stand-up control unit (131). And PE
The strip-shaped body (38a) made of T and integrated with the peeling mount (38b) is set on the horn receiving stand (121) of the standing control jig. And FIG.
As shown in (b), the band (38a) is formed by the horn (111).
The lifter (37) is configured by pressurizing or heating the slab, but here, the standing control unit (131) is set so that the angle formed by one end (37a) and the other end (37b) of the lifter (37) becomes a predetermined angle. ) Is controlled by. As a result, the angle formed by the one end (37a) and the other end (37b) of the lifter (37) is always controlled to a predetermined angle.

Thereafter, the release liner (38b) is peeled off from the lifter (37), and one end (37a) of the lifter (37) is attached to the lower jacket (31) to press the liner sheet (39). The pressure does not vary from product to product, so that uniform running torque and cleaning property can be obtained.

Therefore, even in a magnetic disk cartridge intended for high-density recording, the product-to-product variation can be greatly reduced, and the manufacturing yield can be greatly improved. According to the present embodiment, the variation of the running torque at 1σ can be reduced to half that of the conventional one, and the defective rate of the running torque can be suppressed to 1/5 or less.

The above-mentioned embodiment shows the case where the lifter (37) is processed and installed, but in addition to this, for example, the strip-shaped body (38a) is arranged on the lower jacket (31), and the lower jacket (31) is arranged. ) The lifter (37) may be bent and shaped directly above. Again,
After all, the upright control unit (13) such as the upright control jig (101) described above is
By using the jig having 1), the angle formed between one end and the other end of the strip can be controlled to be constant.

In the above embodiment, the lifter is P
The case where an ET film is used is shown.
The film is not limited to the T film, and, for example, a film made of stainless steel whose shape change with time is small may be used.

[0024]

As described in detail above, according to the method of manufacturing a magnetic disk cartridge of the present invention, it is possible to secure a uniform running torque and cleaning property, thereby significantly improving the manufacturing yield. it can. And, it is most suitable for a high-density magnetic disk cartridge in which the degree of freedom of the lifter pressing force is small.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a magnetic disk cartridge manufactured according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of the magnetic disk cartridge taken along the line AA ′ in FIG.

FIG. 3 is a diagram showing a processing process of the lifter in FIG.

[Explanation of symbols]

 (1) ... Magnetic disk cartridge (11), (31) ... Jacket (19), (39) ... Liner (37) ... Lifter (41) ... Magnetic disk (101) ... Standing control jig

Claims (1)

[Claims] 1. A method of manufacturing a magnetic disk cartridge comprising a disk-shaped magnetic disk rotatably housed in a pair of jackets, and a liner sheet in contact with the magnetic disk and a lifter for pressing the liner sheet against the magnetic disk. The method is characterized by comprising a step of erecting the other end of the strip-shaped body to be a lifter while controlling the angle by the one end and the other end of the flexible strip-shaped body. Manufacturing method of magnetic disk cartridge.