JP2542457Y2 - Shutter for magnetic disk cassette - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter for a magnetic disk cassette.

[0002]

2. Description of the Related Art Conventionally, a magnetic disk cassette having a shape as shown in FIG. 9, for example, is known.
It has a case 1 in which the two shells 2 are integrated. The upper and lower shells 2 of the case 1 are provided with rectangular openings 3 at positions facing each other when they are combined, and recording and reproduction are performed by inserting a magnetic head through the openings 3. A shallow recess 4 is formed in the upper and lower shells 2 where the rectangular openings 3 are formed. The recesses 4 are formed of stainless steel or aluminum or the like, and have substantially the same shape as the openings 3. A shutter 5 having a U-shaped cross section and a shutter window 6 having a size such that the shutter window 6 can be slid in the recess 4 in the direction of the arrow. The shutter 5 is normally at the position shown by the solid line in FIG. 9 due to the force of a spring or the like, and closes the opening 3 of the shell 2 to protect the magnetic disk and prevent dust from entering. In use, the shutter 5 slides in the direction of the arrow to the position shown by the dashed line, and the rectangular opening 2 of the shell 2 and the shutter window 6 coincide with each other, so that the magnetic head can be inserted.

In a magnetic disk cassette having such a structure, it has recently been proposed to form a shutter with a synthetic resin instead of aluminum or the like.

When the shutter is made of a synthetic resin as described above, there is a disadvantage that it is difficult to print characters and the like on the surface. For example, as shown in FIG. 10, it is general to print a print 7 such as the name of the manufacturer of a magnetic disk cassette on the shutter surface. In general, printing on the resin surface is performed by screen printing or pad printing, but unlike printing on paper or the like, there is almost no ink penetration and poor ink adhesion.

[0005] Further, there is a disadvantage that the ink is easily peeled off after printing because it is close to a state where the ink is on the surface, and the ink is easily peeled off even by rubbing with a finger or the like. For example, Japanese Utility Model Laid-Open No. 60-18037
No. 5 discloses a magnetic disk cassette using an easy-to-manufacture, low-cost shutter made of synthetic resin. Is not a problem at all.

[0006]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned drawbacks, and is a shutter for a magnetic disk cassette, in which the surface is easily printed and the printed portion is easily peeled off after printing. An object of the present invention is to provide a shutter made of a synthetic resin that cannot be performed.

[0007]

The shutter for a magnetic disk cassette of the present invention is provided on the surface of a shutter made of a synthetic resin, for example, by appropriately forming linear irregularities such as stripes or lattices or dot-like irregularities. This is one in which fine irregularities are formed, whereby printing is easy, and in particular, printed portions are not easily peeled off after printing.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a shutter for a magnetic disk cassette according to an embodiment of the present invention;

FIG. 1 is a perspective view showing an embodiment of a shutter according to the present invention, in which fine irregularities 11 of horizontal stripes are formed on the surface of a shutter 10 made of synthetic resin. If the name of the manufacturer or the like is printed on the surface having the fine irregularities 11 by screen printing or pad printing as described above, the printing ink enters the concaves of the fine irregularities.
Therefore, even when the shutter surface is touched or rubbed with a finger or the like as shown in FIG. 2A, or when mechanical contact or friction occurs during loading on a deck or the like, the printing ink 13 can be used.
The portion touching is the fine area of the tip of the convex portion, and the concave portion is not touched or rubbed at all. Therefore, there is no possibility that the printed portion is peeled off. In the case of a conventional shutter having a smooth surface as shown in FIG. 2 (B), the printing ink is in a state of rubbing on the surface, and sticking is poor. Since the contact area is large and only the ink is deposited on the surface, the printed portion is easily peeled. For example, as described above, Japanese Utility Model Application Publication No. 60-180375
Such as the shutter described in the issue.

The depth D of the unevenness formed on the shutter of this embodiment is desirably within the following range.

It is desirable that 1/100 <D ≦ 5/100 mm. Generally, the surface of the synthetic resin is printed by screen printing, bad printing, or the like. The thickness of the ink is 2 to 3 μm, and a sufficient peeling prevention effect can be obtained if the depth of the unevenness is about the above. Here, the depth of the unevenness means the distance between the top of the convex and the bottom of the concave on the rough surface where the concave and the convex are present.

That is, when the depth of the unevenness on the rough surface becomes 1/100 mm or less, the depth of the unevenness becomes shallow, so that when printing on the rough surface, most of the ink layer is on the unevenness. Therefore, the effect of preventing the peeling due to the unevenness cannot be obtained, and the film can be easily peeled, so that the object of the present invention cannot be achieved. On the other hand, if the depth of the irregularities exceeds 5/100 mm, the ink will penetrate into the inside during printing, and the effect of preventing peeling will be obtained, but this will cause problems in product production, printing process, and aesthetics. That is, if the depth of the unevenness is too large, when the shutter is molded from a synthetic resin material by an injection molding method or the like, the molded product changes and cannot be used. On the other hand, if the unevenness is too deep, the unevenness is more conspicuous than printed characters and the like, which is not preferable from the viewpoint of beauty. Further, in order to eliminate this aesthetic defect, multiple printing must be performed, which is not preferable because the number of printing steps increases.

For the above reasons, it is desirable that the depth D of the unevenness is within the following range.

1/100 <D ≦ 5/100 mm The following shows the results of a peeling experiment performed on a rough surface having different depths of irregularities so as to make the above contents clear. 0.005 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 Peeling × ○ ○ ○ ○ ○ ○ ○ ○ POM appearance ○ ○ ○ ○ ○ ○ △ × × ━━━━━━━━━━━━━━━━━━━━剥離 Peeling × ○ ○ ○ ○ ○ ○ ○ ○ PBT appearance ○ ○ ○ ○ ○ ○ ○ × × ━━━━━━━━━━━━━ ━━━━━━━━━━━━━━━━━━━━━━━ Peeling × × ○ ○ ○ ○ ○ ○ △ PA appearance ○ ○ ○ ○ ○ ○ ○ △ × × ○ does not peel or print The unevenness is less conspicuous as compared with characters and the like, x indicates peeling or the unevenness is not as good as aesthetic appearance, and Δ indicates an intermediate state between the two. POM is polyacetal, PBT is polybutylene terephthalate, P
A is a polyamide.

FIGS. 3 to 8 show other examples of the uneven shape according to the present invention. FIG. 3 shows vertical stripes, FIG. 4 shows diagonal stripes, FIG. 5 shows a lattice, and FIG. , FIG. 7 shows the waveform, FIG.
Is a partially enlarged view of each pattern of crossed circles.

The same effect as that of the above embodiment can also be obtained by forming innumerable dot-like irregularities on the shutter surface by sandblasting or the like.

In order to form the linear and dot-like concave and convex patterns, it is sufficient to form them at the same time as forming the pattern on the mold and forming the shutter.

[0018]

[Effect of the Invention] Although the shutter for a magnetic disk cassette of the present invention is made of synthetic resin, its surface has a linear shape.
By forming the dot-like irregularities, it is possible to easily perform printing on the shutter surface, and in particular, there is an advantage that the printed portion does not easily peel off after printing and has excellent durability. In addition, the finish at the time of printing is extremely good, which is preferable from an aesthetic point of view.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which a finger touches a shutter print surface.

FIG. 3 is a partially enlarged view of a pattern showing another example of the concavo-convex shape formed on the shutter surface of the present invention.

FIG. 4 is a partially enlarged view of a pattern showing another example of the concavo-convex shape formed on the shutter surface of the present invention.

FIG. 5 is a partial enlarged view of a pattern showing another example of the uneven shape formed on the shutter surface of the present invention.

FIG. 6 is a partially enlarged view of a pattern showing another example of the concavo-convex shape formed on the shutter surface of the present invention.

FIG. 7 is a partially enlarged view of a pattern showing another example of the uneven shape formed on the shutter surface of the present invention.

FIG. 8 is a partially enlarged view of a pattern showing another example of the uneven shape formed on the surface of the shutter of the present invention.

FIG. 9 is a plan view of a magnetic disk cassette having a conventional shutter.

FIG. 10 is a diagram illustrating an example of a print display on a shutter surface.

[Explanation of symbols]

 7 Printing 10 Shutter 11 Linear unevenness

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mamoru Kinuta 2606 Akabane, Oga, Haga-gun, Tochigi Kao Co., Ltd. (72) Inventor Toshihiko Sekiguchi 2-30-1 Namiki, Kawaguchi City, Saitama Prefecture (72) Inventor Yoshio Tamiya 2-31 Namiki, Kawaguchi-shi, Saitama Prefecture Enplas Co., Ltd. (56) References Japanese Utility Model 1987-142777 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A shutter for opening and closing a magnetic head insertion hole of a magnetic disk cassette, which is integrally formed of a synthetic resin selected from polyacetal, polybutylene terephthalate, and polyamide, wherein the depth of the shutter surface is within the following range. A shutter for a magnetic disk cassette, characterized in that a rough surface having irregularities is formed and printing is performed on the rough surface. 1 / 100mm <D ≦ 5 / 100mm 2. A shutter for opening and closing a magnetic head insertion hole of a magnetic disk cassette, which is integrally formed of a synthetic resin selected from polyacetal, polybutylene terephthalate, and polyamide, wherein a depth D of the shutter surface is within the following range. A method for manufacturing a shutter for a magnetic disk cassette, characterized in that a rough surface having irregularities is formed and printing is performed on the rough surface. 1 / 100mm <D ≦ 5 / 100mm