JPH09326181A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously attain the prevention of scratch on a shutter surface and the antistatic effect. SOLUTION: In the disk cartridge furnished with a cartridge 3 whereon a head inserting port 2 is arranged, and a shutter 6 which is formed by a metallic plate with the U-shaped sectional plane and provided with a pair of shutter plates 4, 5 mounted at the outside of the cartridge 3 so as to slide freely for opening/closing the head inserting port 2, a coating layer 13 for preventing the scratch is formed on the surface of a pair of shutter plates 4, 5 of the shutter 6, and an antistatic agent 15 is added to this coating layer 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge having a disk-shaped recording medium accommodated therein and provided with a head insertion opening, and a metal plate which has a substantially U-shaped cross section.
The present invention relates to a disc cartridge having a pair of shirt-ter plates slidably attached to the outside of the cartridge and configured to open and close the head insertion opening.

[0002]

2. Description of the Related Art As shown in, for example, Japanese Utility Model Publication No. 60-6938, a conventional disk cartridge which accommodates and uses a disk-shaped recording medium such as a magnetic disk or an optical disk is shown in FIGS. A disk-shaped recording medium 1 is housed, and a cartridge 3 having a pair of upper and lower head insertion openings 2 and a metal plate are pressed into a substantially U-shaped cross section. And a shutter 6 having a pair of upper and lower shutter plates 4 and 5 slidably mounted on the head and adapted to open and close the head insertion opening 2. A pair of upper and lower apertures 7 are provided at the ends of the shutter plates 4 and 5 on the arrow a direction side. Then, the shutter plates 4 and 5 are attached to the upper and lower surfaces 3a and 3a of the cartridge 3, respectively.
The guide groove 1 is formed in the lower surface 3b of the cartridge 3 and has a plurality of ribs 9 formed in the concave portion 8 formed in b and pressed from the lower shutter plate 5 upward at a right angle.
It is loosely fitted to 0. The lower surface 3b of the cartridge 3
The center core 1a of the disk-shaped recording medium 1 is loosely fitted in the turntable insertion hole 11 provided at substantially the center of the disk.

In this disc cartridge, when not in use, the shutter 6 is urged to slide by the built-in spring (not shown) in the direction of the arrow a to the closed position of the solid line in FIGS. The pair of upper and lower head insertion openings 2 are closed by 4, 5 and these head insertion openings 2 are closed.
The inside of the cartridge 3 is prevented from entering.

On the other hand, when this disk cartridge is set in the recording / reproducing apparatus, the shutter 6 is slid in the direction of arrow b to the open position of the one-dot chain line in FIGS. The pair of openings 7 are overlapped above and below the pair of upper and lower head insertion openings 2 to open the head insertion openings 2. And the turntable insertion hole 1
A turntable (not shown) relatively inserted in the 1
The disc-shaped recording medium 1 is chucked by the center core 1a, and the disc-shaped recording medium 1 is recorded by a pair of upper and lower recording / reproducing heads (not shown) inserted from above and below in the pair of upper and lower head insertion openings 2. , Playback is performed.

[0005]

By the way, the shutter 6 is mainly pressed by a stainless plate having a plate thickness of about 0.15 to 0.3 mm. And, in order to increase the decorativeness of the entire disc cartridge, normally,
A parallel scratch called a hairline having a width of about 100 to 300 μm and a depth of about 1.5 to 3 μm is applied to the entire surface of the shutter 6 to give the shutter 6 a high-class feeling.

However, since the crests of the hairline are extremely small, as shown in FIG. 14, the shutter plates 4 and 5 of the pair of shutters 6 arranged adjacent to each other are rubbed against each other during the manufacture, as shown in FIG. If the shutter plates 4 and 5 were strongly pressed against the conveyor or the like on the line, the hairline ridges could easily be crushed and scratches could easily occur.

If the shutter 6 is scratched, the commercial value will be significantly deteriorated. Therefore, the shutter 6 must be handled very carefully, and the inspection must be performed strictly. Therefore, conventionally, there has been a serious problem that the manufacturing yield is low and the productivity is low.

Further, when the hairline is directly touched with a finger, oil, dirt, fingerprints, etc. of the finger permeate into the valley of the hairline and cannot be easily removed, so that there is a problem that the appearance quality is remarkably deteriorated. .

The present invention makes it possible to protect the surface of the shirt from the above-mentioned inconveniences and to prevent the shirt from being easily charged due to this protective measure so that dust is not attached. .

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a disk cartridge described at the beginning for preventing scratches on the surfaces of a pair of shirt plates of a substantially U-shaped shutter. A coating layer is formed, and the coating layer contains an antistatic agent.

[0011]

According to the disk cartridge constructed as described above, even if the shutter plates of a pair of shutters arranged adjacent to each other are rubbed against each other, due to the step corresponding to the thickness of the coding layer. , It is possible to prevent the hairlines on the surface of the shutter plate from directly rubbing against each other.

Even if the shutter plates rub against each other, static electricity is less likely to be charged.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a disk cartridge to which the present invention is applied will be described below with reference to FIGS. The same parts as those of the conventional example shown in FIGS. 12 to 14 are designated by the same reference numerals, and the duplicated description will be omitted.

First, a disk cartridge according to an embodiment of the present invention will be described with reference to FIGS.

In the disk cartridge shown in FIGS. 1 to 4, of the pair of upper and lower shutter plates 4 and 5 of the shutter 6 formed of a metal plate such as a stainless plate, the surface of the lower shutter plate 5 is A scratch-resistant coating layer 13 made of a transparent or colored abrasion-resistant ink or the like is applied by silk printing or a thermal transfer method (a method of thermally transferring the ink applied to the film). At this time, the thickness of the coating layer 13 is 4 to 2
About 0 μm is sufficient. In addition, here, the coating layer 13 is formed around the entire outer peripheral edge 5a of the lower shutter plate 5,
The entire circumference of the outer peripheral edge 5b of the opening 7 is ribbed by pressing.
The rib hole 9a is formed in a strip shape with a width of 1 to 2 mm over the entire outer peripheral edge 5c.

On the surface of the upper shutter plate 4, a mark 14 such as a maker name or a product name made of colored abrasion-resistant ink is formed by silk printing or the like.
It is applied to about 20 μm.

Then, the coating layer 13 and the mark 14
When applying by silk printing etc., the shutter 6
The shutter 6 may be punched after being pre-coated on the roll-shaped material before punching, or may be coated one by one on the shutter 6 after being pressed.

According to the disk cartridge configured as described above, as shown in FIG. 2, the shutter plates 4 and 5 of the pair of shutters 6 disposed adjacent to each other are rubbed together during manufacture, as shown in FIG. Even if the shutter plates 4 and 5 are strongly pressed against the conveyor on the manufacturing line, the coating layer 13 and the mark 14
Since the surface of both shutter plates 4 and 5 floats only by the step corresponding to the thickness of and, the hairlines on the surfaces of both shutter plates 4 and 5 can be rubbed against each other directly or pressed against the conveyor as much as possible. It can be prevented.
Therefore, it is possible to prevent the hairline peaks on the surface of the shutter 6 from being crushed and causing scratches as much as possible.

In the embodiments shown in FIGS. 1 to 4 described above, the coating layer 13 was formed on the surface of the lower shutter plate 5 of the shutter 6, and the mark 14 was formed on the surface of the upper shutter plate 4. However, a similar coating layer 13 may be formed on the surface of the upper shutter plate 4.

Incidentally, FIGS. 5, 6 and 7 show modifications of the embodiment shown in FIGS. 1 to 4, respectively.
Only a part of the outer peripheral edge 5a of the shutter plate 5, only three directions of the outer peripheral edge 5a, and the outer peripheral edge 5c of the opening 7 and the rib hole 9a.
The coating layer 13 is formed partially and in a band shape only on the entire circumference. Also, with these three modifications, it is possible to prevent the hairline peaks on the surface of the shutter 6 from being crushed and causing scratches as much as possible, as in the case of the embodiments shown in FIGS. 1 to 4 described above. .

Next, a disk cartridge according to another embodiment of the present invention will be described with reference to FIGS.

In the disk cartridge shown in FIGS. 8 to 10, the coating layer 1 is formed on the entire surface of the shutter 6.
3 is formed, and the coating layer 13 is subjected to antistatic treatment. That is, the coating layer 13 is formed of, for example, a transparent abrasion-resistant ink such as polyester resin, acrylic, polyester melamine, or fluorine resin, and the abrasion-resistant ink includes, for example, anion, cation, nonion, The antistatic agent 15 made of a surfactant such as amphoteric or a polar polymer is usually contained in an amount of 1 to 10% by weight. Then, the abrasion-resistant ink containing the antistatic agent 15 is applied to the entire surface of the shutter 6 by silk printing or a thermal transfer method,
The coating layer 13 is formed. A mark 14 is formed on the coating layer 13.

If a wear-resistant ink such as polyester resin, acrylic resin, polyester melamine, or fluorine resin is applied to the entire surface of the shutter 6, the hairline on the entire surface of the shutter 6 can be protected.

However, since the abrasion-resistant ink is non-conductive, if the shutters 6 rub against each other, the surface of the abrasion-resistant ink will be significantly charged with static electricity. Therefore, dust or the like is easily attached to the surface of the shutter 6. Moreover, if the attached dust or the like adheres to the disc-shaped recording medium 1 in the cartridge 3, a serious accident such as signal loss or recording failure will be caused.

Therefore, if the coating layer 13 containing the antistatic agent 15 in the abrasion-resistant ink is formed on the entire surface of the shutters 6, even if the shutters 6 rub against each other, the coating is performed. Since the surface of the layer 13 is not easily charged with static electricity, dust or the like is unlikely to adhere to the shutter 6.

It is to be noted that an anionic antistatic agent 15 is contained in the polyester resin in an amount of 3% by weight and then applied to the surface of the shutter 6 in a thickness of 4 to 5 μm to form the coating layer 13. When the effect was tested, the characteristics shown in FIG. 11 were obtained. In this experiment, static electricity of 8.5 KV was applied to the sample surface (surface of the coating layer 13) by corona discharge, and the static electricity was discharged (leakage).
The time to do was measured. In this case, the initial charge amount and the time required for the charge amount to be reduced by half are measured. The smaller these values are, the better the antistatic effect of the sample is.

Then, in the experimental result shown in FIG. 11, the characteristic A of the coating layer 13 containing the antistatic agent 15 was measured.
Indicates that the initial charge amount is about 75% as compared with the characteristic B of the coating layer 13 not containing the antistatic agent 15,
The time required for the charge amount to be reduced by half was about 1/4.

As another specific example of applying antistatic treatment to the coating layer 13 by applying an antistatic treatment, for example, an abrasion resistant ink such as polyester resin to which carbon is added is applied. Also, the same antistatic effect as in the above case can be obtained. Then, when carbon is added, a color excellent in terms of decorativeness can be obtained.

Further, it is 0.2 in a composition containing conductive fine powder such as tin oxide and antimony and the balance being tin oxide.
By using an antistatic agent having a particle size of μm or less, the antistatic effect can be obtained without significantly impairing the color appearance of the ink.

Further, after forming the coating layer 13,
The antistatic effect can also be obtained by applying a nitrogen-containing or nonionic antistatic agent such as fatty acid ester or polyoxyethylene alkylamine to the surface of the coating layer 13 by a suitable method.

However, in order to obtain the antistatic effect on the surface of the shutter 6, the antistatic treatment is applied to the total surface area of the shutter 6 or the area of 80% or more of the total surface area of the shutter plates 4 and 5, respectively. Need to give.

On the other hand, if the coating layer 13 is uniformly formed on the entire surface of the shutter 6, the unevenness due to the peaks and valleys of the hairline on the surface of the shutter 6 can be smoothed, and the step of forming the coating layer 13 can be performed. Can be simplified.

The surface roughness of the coating layer 13 having a thickness of 5 μm formed of acrylic resin was measured and found to be 0.6 μm (PZ).
Surface roughness of 1.42 μm (P
Since it is Z), it can be known that the entire surface of the shutter 6 is smoothed by forming the coating layer 13.

By forming the coating layer 13 on the entire surface of the shutter 6 and smoothing the unevenness due to the peaks and valleys of the hairline on the surface of the shutter 6, even if the surface of the shutter 6 is directly touched with fingers, It is difficult for oil, dirt, fingerprints, etc. to adhere, and even if it does, it can be easily removed by wiping it lightly.

The embodiments of the present invention have been described above.
The present invention is not limited to the above-described embodiments, and various effective modifications can be made based on the technical idea of the present invention.

Further, the present invention can be applied to various disc cartridges for accommodating and using various disc recording media.

[0037]

According to the present invention configured as described above, even if the shutter plates of a pair of shutters arranged adjacent to each other rub against each other, it corresponds to the thickness of the coating layer. Since the step can prevent the hairlines on the surface of the shutter plate from directly rubbing against each other, it is possible to prevent the hairline on the surface of the shutter from being crushed and causing scratches. Therefore, the number of scratches during manufacturing can be greatly reduced, and the manufacturing yield can be improved. In addition, productivity can be improved because the inspection process can be reduced or changed to a simple method. Furthermore, the appearance quality of the shutter can be maintained for a long period of time.

Further, by forming a coating layer on the surface of the shutter to smooth the unevenness of the hairline, even if the finger directly touches the surface of the shutter, oil, dirt, fingerprints, etc. of the finger are unlikely to adhere, Even if it adheres, it can be wiped off lightly.

Further, since the coating layer contains an antistatic treatment agent, even if the shutters rub against each other, static electricity is less likely to be charged. Therefore, dust or the like is generated on the surface of the shutter. Difficult to attach.

[Brief description of drawings]

FIG. 1 is a bottom view of an entire disc cartridge according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing an overlapping state of the shutters shown in FIG.

FIG. 3 is a perspective view showing a lower surface of the shutter shown in FIG.

FIG. 4 is a perspective view showing an upper surface of the shutter shown in FIG.

5 is a bottom view showing a modified example of the shutter shown in FIG.

FIG. 6 is a bottom view showing another modification of the shutter shown in FIG.

FIG. 7 is a bottom view showing still another modified example of the shutter shown in FIG.

FIG. 8 is a perspective view showing a lower surface of a shutter of a disk cartridge according to another embodiment of the present invention.

9 is a perspective view showing an upper surface of the shutter shown in FIG.

FIG. 10 is an enlarged cross-sectional view with a part omitted of a disk cartridge incorporating the shutter of FIG.

FIG. 11 is a graph of a discharge characteristic of a shutter for explaining the effect of the present invention.

FIG. 12 is a perspective view showing an upper surface of a conventional disc cartridge.

13 is a perspective view showing the lower surface of the disc cartridge of FIG. 12. FIG.

FIG. 14 is an enlarged cross-sectional view showing an overlapping state of the shutters shown in FIG.

[Explanation of Codes] 1 Disc-shaped recording medium 2 Head insertion port 3 Cartridge 4 Shutter plate 5 Shutter plate 6 Shutter 13 Coating layer 14 Mark 15 Antistatic agent

Claims (1)

[Claims] 1. A cartridge in which a disk-shaped recording medium is housed and which is provided with a head insertion opening, and a metal plate which has a substantially U-shaped cross section and is slidably mounted on the outside of the cartridge. A disc cartridge comprising a shirtter having a pair of shirtter plates configured to open and close a head insertion opening, wherein a coating layer for preventing scratches is formed on the surface of the pair of shirtter plates of the shirtter, and the coating layer is formed. A disk cartridge characterized in that an antistatic agent is included in.