KR100242150B1 - Disk cartridge - Google Patents

Abstract

The present invention accommodates a disc-shaped recording medium therein, a cartridge having a head insertion opening, and a sheet metal, and is formed in a substantially U-shaped cross section, and is formed on the outside of the cartridge to open and close the head insertion opening by a pair of covers. A disc cartridge comprising a slidably mounted shutter, wherein at least one outer surface of the two covers is partially covered by a coating to prevent shutter failure.

Description

Disc cartridge

1 is a rear view of a disk cartridge according to an embodiment of the present invention.

2 is an enlarged cross-sectional view of two disk cartridges of FIG. 1 in which one disk cartridge is superimposed on another cassette cartridge.

3 is a rear perspective view of the shutter of FIG.

4 is a front perspective view of the shutter of FIG.

5 to 7 are rear views of respective shutters obtained by the deformation of the shutter of FIG.

8 is a rear perspective view of the shutter of the disc cartridge of FIG. 1 according to another embodiment of the present invention.

9 is a front perspective view of the shutter of FIG. 8;

10 is an enlarged cross-sectional view of the shutter of FIG.

11 is a graph showing the relationship between time-discharge voltages generated in a coating covering the outer surface of a shutter.

12 is a front perspective view of a conventional disc cartridge.

FIG. 13 is a rear perspective view of the disc cartridge shown in FIG. 12. FIG.

14 is an enlarged cross-sectional view of two disk cartridges of FIG. 12 in which one disk cartridge is superimposed on another disk cartridge.

* Explanation of symbols for main parts of the drawings

1: recording medium 3: cartridge

4: upper cover 5: lower cover

6: shutter 9: protrusion

11 turntable insert 13 coating

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge in which a recording medium such as a magnetic disc, an optical disc, and the like is accommodated, and more particularly, to a means for preventing a defect of a shutter of a cartridge.

12 to 14, a disc cartridge is disclosed in Japanese Laid-Open Laboratory No. 60-6938, which contains a disc-shaped recording medium 1 therein and includes a pair of disc cartridges. A cartridge 3 having an upper and lower head insertion opening 2 and a thin metal, which is formed into a substantially U-shaped cross section by press working, and is made up of upper and lower head insertion openings by a pair of covers 4 and 5. It consists of a shutter 6 which can move in the directions of arrows a and b from the outside of the cartridge 3 to open and close the 2.

The covers 4, 5 of the shutter 6 have respective openings 7 proximate their tip when the shutter 6 is moved in the direction of the arrow a, and the upper surface 3a of the cartridge 3. ) And each suppressing portion 8 formed on the lower surface 3b. Further, a plurality of protrusions 9 formed by press working so as to protrude vertically upward from the lower beaker portion 5 of the shutter 6 can slide in the grooves 10 formed in the lower surface 3b of the cartridge 3. To be excreted. Here, it should be noted that the center plate 1a of the disc-shaped recording medium 1 is securely fixed to the turntable insertion opening 11 formed approximately at the center of the lower surface 3b side of the cartridge 3.

When the disc cartridge is not in use, the shutter 6 is moved in the direction of the arrow a toward the closed position indicated by solid lines in FIGS. 12 and 13 by the force of a spring (not shown) disposed in the cartridge 3. As it is moved, the pair of upper and lower head insertion openings 2 are closed by the pair of covers 4 and 5, respectively. Thus, the cartridge 3 is protected from dust flowing into the inside through the head insertion opening 2.

When the disc cartridge is inserted into the recording and / or reproducing apparatus, the shutter 6 slides in the direction of the arrow b toward the open position indicated by the dashed-dotted lines in FIGS. 12 and 13, and as a result, the shutter 6 The pair of openings 7 coincide with the pair of head inserting openings 2, thereby opening the head inserting openings. At the same time, the turntable (not shown) of the apparatus is connected to the central plate 1a of the recording medium 1 and inserted into the cartridge 3 through the turntable insertion opening 11 to drive the recording medium 1. A pair of upper and lower recording or reproducing heads (not shown) is inserted into the cartridge 3 through the pair of head insertion openings 2 to record information on the recording medium 1 or to the recording medium 1. Play back information from.

On the other hand, the shutter 6 is made of stainless steel of 0.15 ~ 0.3mm thickness, and for the good appearance of the disc cartridge, the entire surface of the shutter 6 is a groove having a width of 100 ~ 300㎛ and a depth of 1.5 ~ 3㎛ It is decorated with a ″ hair line ″ which is made up, and the depth of this hairline is very low, so that the hairline is made during manufacture of the shutter 6 due to friction between the shutters 6 or strong contact with the conveyor during manufacture. Susceptible to collapse or damage.

Moreover, in order to prevent the commercial value of the disc cartridge from deteriorating due to damage to the shutter 6, the shutter 6 must be handled with great care, and the shutter 6 must be carefully examined. Therefore, the manufacturing productivity falls and the yield falls. In addition, when the shutter 6 is in direct contact with the bare hand, the hairline is smeared with fingerprints or the like and is not easily removed, thereby making it difficult to provide a very good appearance for the disc cartridge.

It is therefore an object of the present invention to provide a disc cartridge which overcomes the above-mentioned drawbacks.

It is another object of the present invention to provide a disc cartridge that is not damaged by the hairline formed on the outer surface of the shutter in the manufacture of the shutter, at least not directly rubbing by the presence of a coating covering at least part of the shutter. Therefore, when the shutters rub against each other, the appearance of the shutters is considerably reduced, so that the production productivity of the shutters is improved, the yield of the shutters is improved by omitting or simplifying the inspection process, and the appearance of the shutters is maintained for a long time.

It is still another object of the present invention to provide a disc cartridge, wherein the hairline formed on the outer surface of the shutter is coated with a coating so that the outer surface of the shutter is not stained with fingerprints or the like, and is easily removable even if stained.

It is another object of the present invention to provide a disc cartridge in which an antistatic agent is added to the shutter-coated coating so that the surface of the shutter is not contaminated by dust or the like.

According to one aspect of the present invention, there is provided a disc-shaped recording medium therein, a cartridge having a head insertion opening, and a sheet metal, and formed in a substantially U-shaped cross section to open and close the head insertion opening by a pair of covers. A disc cartridge comprising a shutter slidably mounted on the outside of the cartridge, wherein at least one outer surface of the two covers is partially covered by a coating to prevent a shutter defect.

In a preferred embodiment of the invention the coating is antistatic.

The above and other objects, features and advantages of the present invention will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings, in which like reference characters designate the same or corresponding parts in the conducting drawings.

A first embodiment of the present invention will be described with reference to FIGS. 1-7, wherein the shutter 6 made of a thin metal such as stainless steel has an upper cover 4 and a lower cover 5, and a lower cover. (5) is covered with a coating (13) to protect the cover (5) from defects. The coating 13 is formed by applying abrasive transparent or colored ink or the like onto the surface of the cover 5 by silkscreen printing or thermal transfer treatment, and the ink applied on the film is applied to the cover 5 at a high temperature. Is transferred.

At this time, it is sufficient that the thickness of the coating 13 is substantially within the range of 4-20 μm. The coating 13 having a width of 1 to 2 mm is formed by the outer edge 5a of the entire lower cover 5, the entire edge 5b of the opening 7, and the hole 9a where the protrusion 9 is formed by pressing. Exposed to the entire edge 5c. Further, letters such as a manufacturer's name and a product name having a thickness of 10 to 20 µm are printed on the surface of the upper cover 4 by applying a wear-resistant bleeding ink or the like by silk screen printing on the surface of the upper cover 4. Here, the ink coating process can be performed on the rolled sheet metal before the shutter 6 becomes blank or on each shutter 6 after press processing.

Thus, if the covers 4 and 5 of the two shutters 6 are in contact with each other during the manufacturing process, such as the friction or the conveyor included in the manufacturing equipment, as shown in FIG. 2, the facing cover 4, Since 5) is spaced apart by a distance corresponding to the thickness of the coating 13 or character 14, hairlines formed on the surfaces of the shutters 4 and 5 are protected from damage.

In the first embodiment described above, the coating 13 is formed only on the lower cover 5 of the shutter 6, but it is also possible to form the same coating on the upper cover 4. In addition, the coating may be formed on only one or three of the four edges of the shutter 6 (FIGS. 5 and 6), or the entire opening 7 and the hole 9a (FIG. 7). It may be formed only at the edges 5b and 5c.

In the second embodiment shown in FIGS. 8 to 10, the coating 13 is coated on the entire surface of the shutter 6, and the coating 13 contains an antistatic agent. As the coating 13, for example, transparent wear-resistant inks such as polyester resins, acrylic resins, polyester-melamine plastics, and fluoroplastics are used. The same antistatic agent 15 is added in an amount of 1-10% by weight. Such inks are applied on the entire surface of the shutter 6 by silkscreen printing or thermal transfer treatment to form a coating 13. On this coating 13, letters 14 representing manufacturer names and the like are formed.

The hairline formed on the shutter 6 is reliably protected by the coating 13, but if the antistatic agent 15 is not added, the electrostatic charge is charged on the coating 13 by the non-conductivity of the ink. For example, when the shutters 6 rub against each other, the shutters 6 are covered with dust, and if the recording medium 1 in the cartridge 3 is contaminated with such dusts, an incomplete transmission of a signal or an impossibility of recording may occur. There is a serious shortcoming. In this second embodiment, the antistatic agent 15 is added to the ink so that the shutter 6 is not contaminated by dust.

As for the antistatic effect, it was formed on the surface of the shutter 6 by applying a polyester resin having a thickness of 4 to 5 탆, and experimented with a coating (A) containing 3% by weight of anionic surfactant. To compare with (A), 8.5kV electrostatic potential was applied to the other coating (B) formed by applying only polyester resin through corona discharge.

As shown in FIG. 11, the voltage obtained at the beginning of coating (A) corresponds to 75% of the voltage obtained at the beginning of coating (B), and the voltage of coating (A) is reduced to half of its initial voltage. The time up to corresponds to approximately 1/4 of the time in the coating (B). Therefore, it is clear that the antistatic agent shows a good effect.

Carbon may be added to the ink as an antistatic agent, and when carbon is added, the coating becomes good as well as antistatic. As an antistatic agent, a powder having a diameter of 0.2 μm or less including an electrically conductive powder such as tin oxide and antimony and other tin oxide powder may be used, in which case the coating does not damage the color and prevents static electricity. The antistatic effect may be obtained by applying nitric acid and nonionic antistatic agents such as fatty acid esters and polyoxyethylene-alkylamines on the surface of the coating 13. At this time, more than 80% of the entire surface of the shutter 6 or the entire surface of the pair of covers 4 and 5 needs to be coated with an antistatic agent so as to obtain an antistatic effect.

When the entire surface of the shutter 6 is covered with the coating 13, the surface of the shutter 6, which is roughened by the hairline, becomes flat. According to the roughness experiment, the surface roughness of the coating 13 made of acrylic resin having a thickness of 5 μm is 0.6 μm (PZ), while the surface roughness of the covers 4 and 5 without coating is 1.42 μm (PZ).

In addition, when the entire surface of the shutter 6 is covered with the coating 13, the surface of the shutter 6 is not easily contaminated by hands, and even if contaminated, it can be easily removed by simply wiping off.

While the exemplary embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to these embodiments, and is defined in the following claims without departing from the spirit or gist of the invention. Various modifications and variations can be made by the technician. It should also be noted that the present invention can be applied to various types of disc cartridges capable of accommodating various types of disc-shaped recording media.

Claims (9)

A disc-shaped recording medium is accommodated therein, and a cartridge having a head insertion hole, and made of thin metal, formed into a substantially U-shaped cross section, and slidably mounted on the outside of the cartridge to open and close the head insertion hole with a pair of covers. A disc cartridge comprising a shutter, wherein the disc cartridge is formed by a transparent wear resistant ink, and an antistatic coating comprising 1 to 10% by weight of an antistatic agent is formed on at least one surface of the two covers. The disk cartridge of claim 1, wherein the coating is selected from the group consisting of polyester resins, acrylic resins, polyester-melamine plastics, and fluoroplastics. The disk cartridge of claim 2, wherein the coating further comprises an anionic antistatic agent. The disk cartridge of claim 2, wherein the coating further comprises a cationic antistatic agent. The disk cartridge of claim 2, wherein the coating further comprises a zwitterionic antistatic agent. 3. The disc cartridge of claim 2, wherein the coating further comprises a polar high polymer material added as an antistatic agent. 3. The disc cartridge of claim 2, wherein the coating further comprises carbon added as an antistatic agent. 3. The disc cartridge of claim 2, wherein the coating further comprises an electroconductive powder having a diameter of 0.2 µm or less selected from the group consisting of tin oxide and antimony as an antistatic agent. 3. The disc cartridge of claim 2, wherein the coating further comprises a fatty acid ester of the coating surface and a polyoxyethylene-alkylamine as an antistatic agent and covers at least 80% of the outer surface of the shutter.

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