JPH05101586A - Disk cartridge - Google Patents

Abstract

PURPOSE:To improve merchandise quality by enhancing the printability on a cartridge case or shutter. CONSTITUTION:At least the ester compd. of glycerol and amine org. compd. are incorporated into the cartridge case 1 or shutter 3 of the disk cartridge provided with a disk 2 for recording, the cartridge case 1 which rotatably houses the disk for recording and has a head insertion port 5 in a prescribed position, and the shutter 3 made of a synthetic resin for opening and closing the head insertion port 5 of the cartridge case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge such as a magnetic disk cartridge, an optical disk cartridge or an optical-magnetic disk cartridge, and more particularly to a cartridge case of the disk cartridge and a head insertion opening of the cartridge case. It relates to the material of the shutter that opens and closes.

[0002]

2. Description of the Related Art A magnetic disk cartridge is a cartridge case having a magnetic head insertion opening and a rotary drive opening, a flexible magnetic disk rotatably housed in the cartridge case, and the cartridge cartridge. The cleaning sheet is mainly composed of a cleaning sheet welded to the inner surface of the case and a shutter for opening and closing the magnetic head insertion opening of the cartridge case.

As a material for the cartridge case, for example, a synthetic resin such as ABS resin, styrene resin or acrylic resin has been used.

If a metal one is used as the above-mentioned shatter, while the reciprocating motion of the shatter is repeated,
The surface of the cartridge case is shaved at the edge portion of the shutter, and shavings are generated. If this shavings enters the cartridge case and adheres to the surface of the magnetic disk or the magnetic head, it adversely affects recording and reproduction and causes an error. Therefore, the generation of shavings is suppressed by using a synthetic resin shutter.

However, since the cartridge case and the shutter are formed of synthetic resin, dust and dust in the atmosphere are adsorbed by the cartridge case and the shutter, and they enter the cartridge case, causing the error. It often becomes. Therefore, various studies have been conducted on adding an antistatic agent to the cartridge case and the shutter.

[0006]

Conventionally, amine type organic compounds and the like have been used as this type of antistatic agent, but in the case of the conventional antistatic agent, the addition of such an antistatic agent makes it possible to print on cartridges and shutters. Is reduced.

Usually, on the surface of the cartridge case or the shutter, for example, the indication of the A side, the B side, the indication of the kind of the disc cartridge or the indication of the trademark or the design is made by printing. When the printability is deteriorated as described above, there is a problem that the printing ink does not adhere well and the printed portion is separated from the surface of the cartridge case or the shutter during use.

An object of the present invention is to solve the above drawbacks of the prior art and to provide a disk cartridge having good printability and an antistatic effect.

[0009]

In order to achieve the above object, the present invention provides a recording disk, a cartridge disk case that rotatably accommodates the recording disk, and has a head insertion opening at a predetermined position, and The present invention is intended for a disc cartridge having a shutter made of a synthetic resin such as polypropylene for opening and closing the head insertion opening of the cartridge case.

The shutter is characterized in that it contains at least an ester compound of glycerin such as glycerin monostearate.
In order to achieve the above object, the present invention further provides a recording disk, a cartridge storage case that rotatably accommodates the recording disk and has a head insertion opening at a predetermined position, and a head insertion opening of the cartridge storage case. The present invention is intended for a disk cartridge including a shutter made of a synthetic resin such as polypropylene that opens and closes.

Then, a mixture of at least an ester compound of glycerin such as glycerin monostearate and an amine type organic compound such as NN-bishydroxyalkylamine containing a polyhydric alcohol monoester is added to the shutter. It is characterized by having done.

In order to achieve the above object, the present invention further provides a cartridge disk case made of a synthetic resin such as polypropylene having a recording disk rotatably housed therein and having a head insertion port at a predetermined position. It is intended for disc cartridges equipped with and.

The cartridge case is characterized by containing at least an ester compound of glycerin such as glycerin monostearate.

To achieve the above object, the present invention further provides a cartridge disk case made of synthetic resin such as polypropylene having a recording disk rotatably housed therein and having a head insertion opening at a predetermined position. It is intended for disc cartridges equipped with.

A mixture of at least an ester compound of glycerin such as glycerin monostearate and an amine-based organic compound such as NN-bishydroxyalkylamine containing a polyhydric alcohol monoester is placed in the cartridge case. Is added.

[0016]

According to the present invention, as described above, by adding an ester compound of glycerin such as glycerin monostearate to the cartridge storage case or the shutter,
Also, by adding a mixture of an ester compound of glycerin such as glycerin monostearate and an amine-based organic compound such as NN-bishydroxyalkylamine containing a polyhydric alcohol monoester, the cartridge case or It is possible to improve the printability on the shutter. In particular, amine-based organic compounds such as NN-bishydroxyalkylamines containing polyhydric alcohol monoesters such as ester compounds of glycerin such as glycerin monostearate are used when polypropylene is used as the material for the cartridge case or shutter. It has good compatibility with, and the excellent characteristics of the additives can be sufficiently exhibited.

[0017]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a part of the magnetic disk cartridge according to the embodiment.

As shown in FIG. 1, a magnetic disk cartridge is composed of a cartridge case 1, a flexible magnetic disk 2 rotatably housed therein, and a shutter 3 slidably attached to the cartridge case 1.
And a cleaning sheet (not shown) welded to the inner surface of the cartridge case 1.

The cartridge case 1 is an upper case 1
a and a lower case 1b, which are injection-molded with a hard synthetic resin such as polypropylene, ABS resin, styrene resin, or acrylic resin.

An opening 4 for inserting the rotary drive shaft is formed in a substantially central portion of the lower case 1b, and a rectangular head insertion opening 5 is formed in the vicinity thereof. Although not shown, a head insertion opening 5 is similarly formed in the upper case 1a. In the vicinity of the front surfaces of the upper case 1a and the lower case 1b, a slightly lower recess 6 is formed in order to regulate the sliding range of the shutter 3, and the head insertion opening 5 is opened at an intermediate position of the recess 6. There is.

The magnetic disk 2 comprises a donut-shaped flexible magnetic sheet and a metal or synthetic resin center hub which is inserted into the central hole of the magnetic sheet and adhered thereto. The magnetic sheet is composed of a base film and a magnetic layer formed by coating both sides of the base film.

The base film is made of a synthetic resin film such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or polyimide. The magnetic layer is composed of a mixture of ferromagnetic powder, binder, polishing powder and lubricant.

The shutter 3 is made of, for example, polypropylene or acetal resin.

As shown in FIG. 1, a cartridge case 1
Alternatively (and) on the surface of the shutter 3, for example, A
Side, side B display, display of disc cartridge azalea variety,
Alternatively, a printing portion 7 for displaying a trademark or a design is formed. For this printing, for example, a screen printing method or an offset printing method is used.

Polypropylene is used as a material for the cartridge case 1 or (and) the shutter 3.

That is, for example, a 3.5-inch cartridge case is a thin molded product having a maximum wall thickness of about 1.5 mm, and therefore ABS resin, styrene resin, and acrylic resin flow the molten resin in the mold. Is not so good. Therefore, defective molding may occur, or desired mechanical strength may not be obtained partially. Further, the materials described above do not necessarily have sufficient heat resistance, and the cartridge case may be thermally deformed if left at high temperature.

Compared with this, polypropylene has a good flow of the molten resin in the mold even during thin molding, and therefore has good moldability and can obtain desired mechanical strength as a whole. Furthermore, it has heat resistance, and thermal deformation of the cartridge case does not easily occur even if it is left at high temperature.

Further, when a shatter is molded from an acetal resin, it is easily deformed under high temperature and high humidity conditions such as 45 ° C. and 90% RH because of its material and thin molded product. Therefore, the free end sides of both closed parts provided in the shutter float up from the surface of the cartridge case and open, and even when the shutter is in the closed position, dust and dust enter through the gap between the closed part and the cartridge case. To do. In addition, the apparent total height of the disk cartridge increases due to the opening of the free end side of the obstruction part, and the obstruction part is caught when it is attached to or removed from the recording / reproducing device, and the obstruction part is further deformed. I have something to do.

On the other hand, the polypropylene shredder has a low hygroscopic property, and therefore has the characteristic that it is unlikely to be deformed under high temperature and high humidity as described above.

In the specification of the present invention, a polypropylene cartridge case or a shutter is a homopolymer of propylene, a copolymer of propylene and ethylene, or other α-containing propylene and up to 8 carbon atoms.
It is meant to be molded with copolymers with olefin as well as mixtures thereof.

The glycerin ester compound used in the present invention includes glycerin monostearate, glycerin distearate and glycerin tristearate, among which glycerin monostearate is particularly preferable.

There are various compounds as the amine-based organic compound used in the present invention. Among them, NN-bishydroxyalkylamines represented by the following structural formula (1) and structural formula (2 Mixtures with polyhydric alcohol monoesters such as those shown in) are preferred. Further, the mixing ratio (A) / (B) of the NN-bishydroxyalkylamine (A) and the polyhydric alcohol monoester (B) is 8/2.
The range of 2/8 is suitable, and the range of 6/4 to 4/6 is particularly preferable.

[0033]

[Chemical 1]

As a polypropylene shutter, various kinds of surfactants were added as shown in Table 1 below.

Table 1 Sample No. Interface Activator 1 Glycerin monostearate alone (2%) 2 Glycerin monostearate alone (1%) 3 Glycerin monostearate alone (0.7%) 4 Glycerin monostearate ( 0.2%) / amine-based AS (0.2%) 5 glycerin monostearate (0.25%) / amine-based AS (0.25%) 6 glycerin monostearate (0.5%) / amine-based AS (0. 5%) 7 Amine-based AS alone (0.5%) 8 Other amine-based organic compound (0.3%) 9 No surfactant In addition, the amine-based AS in the table means the structural formula (1) above. It is a mixture of the N-N-bishydroxyalkylamine having and the polyhydric alcohol monoester having the structural formula (2) in the same amount.

Characters are printed on the surface of each of the above-mentioned shutters by ordinary screen printing, and the shutters are kept at 45.degree.
After storing under high temperature and high humidity of 0% RH for 240 hours, adhesive tape was firmly attached to the printing surface, and a peeling test was performed to determine whether or not peeling occurred on the printing surface when the adhesive tape was peeled from the shutter. Done. The results are shown in Table 2 below.

Table 2 Specimen No. Peeling test 1 × 2 △ 3 ○ 4 ○ 5 ○ 6 △ 7 ○ 8 × 9 ○ In this table, ○ indicates that the print strength is acceptable in this peeling test, Δ indicates Indicates that the print strength is acceptable.
The mark X indicates that the print strength was unacceptable.

As is clear from this table, the addition ratio of 2% even when using other amine-based organic compounds (Sample No. 8) or glycerin monostearate (Sample No. 1) Has poor printability, which causes peeling on the printed surface. On the other hand, in the examples of the present invention (Sample Nos. 2 to 6), the printing strength was high and peeling did not occur on the printed surface.

Next, the surface specific resistance value of each shutter was measured. In addition, the surface of each shatter is rubbed with a cloth to charge the surface of the shatter, immediately approaching the height of 1 mm from the ash of the cigarette,
Qualitatively evaluate the chargeability by the amount of ash sucked by the shutter,
The results are shown in Table 3 below.

Table 3 Sample No. Surface specific resistance (Ω) Ash adhesion test 1 3.52 × 10 ¹¹ ○ 2 7.02 × 10 ¹² ○ 3 2.14 × 10 ¹⁴ ○ 4 2.92 × 10 ¹⁶ △ 5 1.77 × 10 ¹³ ○ 6 6.58 × 10 ¹² ○ 7 6.90 × 10 ¹⁶ × 8 2.71 × 10 ¹⁶ × 9 1.00 × 10 ¹⁸ × In this table, ○ indicates this charging property. In the test, no ash adhered, Δ mark showed very small amount of ash adhered, and X mark showed a large amount of ash adhered.

As is clear from this table, amine-based AS
Alone and with a low addition rate (Sample No. 7), those with other amine-based organic compounds added (Sample No. 8) and those without added surfactant (Sample No. 9) showed remarkable ash adhesion. It indicates that dust and dirt in the atmosphere are likely to adhere. On the other hand, in the examples of the present invention, substantially no ash is attached, and each of the above-mentioned tests having an excellent antistatic effect was performed on the shutters, but the same is true for the cartridge case. It has been confirmed by experiments that the effect can be obtained.

In the above embodiment, the case of the magnetic disk cartridge has been described, but the present invention can be applied to other disk cartridges such as an optical disk cartridge.

[0043]

Industrial Applicability As described above, the present invention comprises adding an ester compound of glycerin such as glycerin monostearate to a cartridge case or a shutter, and an ester compound of glycerin such as glycerin monostearate. For example, by adding a mixture with an amine-based organic compound such as NN-bishydroxyalkylamine containing a polyhydric alcohol monoester, it is possible to enhance the printability on the cartridge case or the shutter and improve the product quality. ..

[Brief description of drawings]

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

[Explanation of symbols]

 1 Cartridge case 2 Magnetic disk 3 Shutter 5 Head insertion slot 7 Printed part

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[Procedure amendment]

[Submission date] December 22, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

[Chemical 1]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0035

[Correction method] Change

[Correction] Table 1 Sample No. Surface active agent 1 Glycerin monostearate alone (2%) 2 Glycerin monostearate alone (1%) 3 Glycerin monostearate alone (0.7%) 4 Glycerin monostearate (0.2%) / Amine AS (0.2%) 5 Glycerine Monostearate (0.25%) / Amine AS (0.25%) 6 Glycerine Monostearate (0.5%) / Amine AS (0 0.5%) 7 Amine-based AS alone (0.5%) 8 Other amine-based organic compound (0.3%) 9 No surfactant In addition, the amine-based AS in the table means the structural formula (1) above. Is an N-N-bishydroxyalkylamine.

Claims (18)

[Claims] 1. A recording disk, a cartridge case that rotatably accommodates the recording disk and has a head insertion opening at a predetermined position, and a synthetic resin shutter that opens and closes the head insertion opening of the cartridge storage case. A disk cartridge according to claim 1, wherein the shutter contains at least an ester compound of glycerin. 2. The disk cartridge according to claim 1, wherein the ester compound of glycerin is glycerin monostearate. 3. The disk cartridge according to claim 1, wherein the shutter is formed of polypropylene. 4. The disk cartridge according to claim 1, wherein the content of the glycerin ester compound is regulated to 1% by weight or less. 5. A recording disk, a cartridge case that rotatably accommodates the recording disk and has a head insertion opening at a predetermined position, and a synthetic resin shutter that opens and closes the head insertion opening of the cartridge storage case. A disk cartridge according to claim 1, wherein the shutter contains at least an ester compound of glycerin and an amine-based organic compound. 6. The disc cartridge according to claim 5, wherein the ester compound of glycerin is glycerin monostearate. 7. The disk cartridge according to claim 5, wherein the shutter is formed of polypropylene. 8. The N-type compound according to claim 5, wherein the amine-based organic compound is a polyhydric alcohol monoester.
A disc cartridge containing N-bishydroxyalkylamine. 9. The total content of the glycerin ester compound and the amine-based organic compound according to claim 5,
A disc cartridge which is regulated to be less than or equal to weight%. 10. A disk cartridge including a recording disk and a synthetic resin cartridge case that rotatably accommodates the recording disk, wherein the cartridge case contains at least a glycerin ester compound. Disc Cartridge which is characterized by being present. 11. The disc cartridge according to claim 10, wherein the ester compound of glycerin is glycerin monostearate. 12. The disk cartridge according to claim 10, wherein the cartridge case is made of polypropylene. 13. The disk cartridge according to claim 10, wherein the content of the glycerin ester compound is regulated to 1% by weight or less. 14. A disk cartridge including a recording disk and a synthetic resin cartridge case that rotatably accommodates the recording disk, wherein the cartridge case is at least an ester compound of glycerin and an amine-based compound. A disc cartridge containing an organic compound. 15. The disk cartridge according to claim 14, wherein the ester compound of glycerin is glycerin monostearate. 16. The disk cartridge according to claim 14, wherein the cartridge case is made of polypropylene. 17. The disk cartridge according to claim 14, wherein the amine-based organic compound is an N—N-bishydroxyalkylamine to which a polyhydric alcohol monoester is added. 18. The disk cartridge according to claim 14, wherein the total content of the ester compound of glycerin and the amine-based organic compound is regulated to 1% by weight or less.