JPH03216880A - Magnetic disk - Google Patents

Abstract

PURPOSE:To firmly couple and fix a magnetic disk main body part to a center core by forming not only a mere hole but also a recessed part having a larger area and packing the recessed part with much adhesive. CONSTITUTION:AT the time of integrating the center core consisting of an upper cores 5 and a core main body 6 and a magnetic disk main body part 3a, the magnetic disk main body part 3a is placed on a flange part 14 of the core main body 6, and thereafter, the upper core 5 is fitted from above the magnetic disk main body part 3a and the core main body 6. The upper core 5 is welded to the core main body 6 with an ultrasonic welder or the like, and they are constituted as if the magnetic disk main body part 3a were held between the upper core 5 and the core main body 6. Thereafter, an adhesive is charged to a hole 12 from above the upper core 5 and is guided by the hole 12 and is packed in a recessed part 13. Since not only the more hole 12 but also the recessed pat 13 having a larger area is formed, the recessed part 13 is packed with much adhesive. Thus, the adhesive strength is increased because the adhesion area is larger, and the magnetic disk main body part 3a is firmly coupled ad fixed to the center core.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a magnetic disk such as a biophronopy or a microphronopy.

[Background of the invention]

A cassette type magnetic disk in which a flexible magnetic disk is housed in a node case is widely known. And the magnetic disk stored in the heart case,
Basically, the magnetic disk body and center core are glued together with adhesive. By the way, double-sided adhesive tape was used in the early stages as a means for adhering the magnetic disk body to the center core. However, this adhesive method using double-sided adhesive tape is
Since this may cause wrinkles on the magnetic disk, and from the viewpoint of work efficiency, and furthermore, because it causes variations in the so-called adhesion height, research has been conducted into alternative means. As one of them, as shown in FIG.
It is proposed to form a recess 51 in the flange of the magnetic disk, fill the recess 5l with an adhesive 52, place the magnetic disk main body 53 from above, and adhere the magnetic disk main body 53 to the center core 50. (Japanese Unexamined Patent Publication No. 1-273279). However, in this case, if the amount of adhesive injected into the recess 5l is too small, the magnetic disk body 53 cannot be bonded to the center core 50, and conversely, if it is too large, the adhesive will overflow. , the adhesive is attached to the magnetic disk body 5
There is a risk that the adhesive may adhere to the recording part 3, and furthermore, there are problems such as it is difficult to control the amount of adhesive injected into the recessed part 51 because the so-called adhesive height becomes inconsistent. be. Further, as shown in FIG. 7, a hole 61 is formed in the flange portion of the center core 60, and after the magnetic disk body portion 62 is brought into contact with the center core 60, an instant adhesive is injected through the hole 61. The magnetic disk main body 62 is connected to the center core 60
It has been proposed (Japanese Utility Model Application Publication No. 48472/1983) to adhere the material to the surface. Unlike the one shown in FIG. 6, this one is different from the one shown in FIG.
Since it is in contact with the flange of hole 6, it is not so troublesome to control the amount of adhesive.
However, there is a drawback that the force for adhering the magnetic disk body 62 to the center core 60 by the adhesive injected into the hole 6l is weak.

DISCLOSURE OF THE INVENTION 1 A first object of the present invention is to provide a magnetic disk in which the adhesive between the magnetic disk main body and the center core has a strong adhesive force. A second object of the present invention is to provide a magnetic disk with excellent bonding workability between the magnetic disk main body and the center core. A third object of the present invention is to provide a magnetic disk that does not have the problem of the adhesive used for bonding the magnetic disk main body and the center core protruding out. A fourth object of the present invention is to provide a magnetic disk in which so-called adhesion height does not vary. The object of the present invention is to provide a magnetic disk in which a magnetic disk main body and a center core are bonded with an adhesive,
A recess for an adhesive reservoir is formed in the surface of the center core facing the magnetic disk main body, and a hole communicating with the recess is formed, and the size of the recess is larger than the diameter of the hole. This is achieved by a magnetic disk characterized by the following structure. [Example] Figures 1 to 4 show an example of the magnetic disk according to the present invention. Figure 1 is an exploded perspective view of a magnetic disk stored in a disk storage case, and Figure 2 is a magnetic disk. A plan view of the main parts of the disk. Figure 3 is an explanatory diagram before the magnetic disk body is bonded to the center core with adhesive. Figure 4 is an illustration after the magnetic disk body is bonded to the center core using adhesive rules. It is an explanatory diagram in stages. In each figure, 1 is an upper case that constitutes the disk storage case body A, and 2 is a lower case that cooperates with the upper case 1 to constitute the disk storage case body A. This lower case 2 is formed into a generally shallow dish shape with a joint wall of a constant height extending around the entire circumference along the outer periphery, and the lower case 2 is connected to the upper case 1 via this joint wall. The upper case 1 and the lower case 2 are butted against each other and integrated by means of sonic welding or the like. The upper case 1 and the lower case 2 are made of resin, such as ABS resin, which includes anti-static material. Further, a recess 2a is formed on the inner surface of the lower case 2, and a liner 4 made of a non-woven fabric such as rayon is inserted into the recess 2a to prevent dropout and abrasion of the magnetic disk 3 and generation of static electricity. It is provided by heat welding or ultrasonic welding the peripheral portion. The area of the recess 2a formed at the position where the liner 4 is arranged is slightly larger than the size of the liner 4, and the depth of the recess 2a is shallower than the maximum thickness of the liner 4. Place the peripheral part of the liner 4 into the recess 2 of the lower case 2.
When welded at position a, the thickness of the liner 4 at this welded portion is thinner than the depth of the recess 2a. Therefore, the liner 4 is placed in the recess 2a of the lower case 2,
When the peripheral portion of the liner 4 is welded, although the entire liner 4 fits completely into the recess 2a, the unwelded portion of the liner 4 protrudes above the inner surface of the lower case 2 through the recess 2a, and the magnetic disk 3 is The cleaning action to prevent dripping, abrasion, and the generation of static electricity can be effectively performed. A magnetic disk 3 is housed in a case formed by combining an upper case 1 and a lower case 2. This magnetic disk 3 is a flexible disk-shaped polymer film with a magnetic layer uniformly formed on one surface thereof. An opening 3b is formed, and a ring-shaped center core (an upper core 5 located above the magnetic disk body 3a and a core body 6 configured in cooperation with the upper core 5) is formed in this opening 3b. Fixed. Note that a motor shaft insertion hole is formed in the center of the center core. A circular opening 7a is provided in the center of the upper case 1 and the lower case 2.
, 7b are formed, and the center core is placed in these openings 7a, 7b with some play. The upper case l has a long hole 8a, and the lower case 2 also has a long hole 8a.
b are formed, and these elongated holes 8a. The magnetic disk 3 is exposed from 8b. Long hole 8a. Upper case 1 including the part where 8b is formed
Recesses 9a and 9b (the recess 9b on the outer surface of the lower case 2 is not shown) are formed on the outer surface of the lower case 2.
, 9b, a shutter member 10 made of metal or synthetic resin and having a substantially U-shaped cross section is slidably attached, and is guided by a predetermined guide means to slide. By the action of this guide means, the magnetic disk 3 is moved into the elongated hole 8.
a. The magnetic disk 3 is exposed to the outside in a recording/reproducing state in which the long holes 8a and 8b are closed by a shutter member 10 to protect the magnetic disk 3 and prevent dust from entering. The shutter member 10 slides so that it can be in a closed state. Note that the long holes 8a and 8b are closed by the shutter member 10,
In order to protect the magnetic disk 3 and prevent dust from entering, the shunter member 1o is locked by a locking member when the N% disk 3 is not exposed. Further, the disk storage case body A is provided with a pair of positioning holes for positioning the magnetic disk when it is installed in a disk recording/reproducing device. Incidentally, one of the positioning holes is a long hole, so that even if there is some error in the position of the hole, it can be tolerated. Furthermore, in a predetermined position of the disc storage case body A,
A light protector is configured and the storage case body A
Writing to the magnetic disk 3 inside the computer is enabled or prohibited. In other words, it is configured such that it is in a writable state when the write protector is not removed from a predetermined position, and is in a write-protected state when the write protector is removed from a predetermined position. . Reference numeral 11 indicates a welding protrusion provided at a position opposite to the core body 6 of the upper core 5 in the center core, 12 a hole formed in the upper core 5 in the vertical direction, and 13 communicating with the lower part of the hole 12. A groove-like recess whose cross-sectional area is larger than the cross-sectional area of the formed hole 12 (it does not have to be a groove-like recess,
Alternatively, it may be configured such that a recess is formed when it is integrated with the core body. In order to integrate the center core composed of the upper core 5 and the core body 6 with the magnetic disk body 3a, first, as shown in FIG. Part 3a wi! After this, the upper core 5 is fitted from above the magnetic disk body 3a and the core body 6, and as shown in FIG. 4, the upper core 5 is welded to the core body 6 using an ultrasonic welder or the like. The magnetic disk main body 3a is held between the upper core 5 and the core main body 6. After that, when adhesive is injected into the hole 12 from above the upper core 5, the adhesive is guided into the hole 12 and filled into the recess 13, and the adhesive filled into the recess 13 causes the upper core to 5 and the core body 6, the magnetic disk body 3a is firmly connected and fixed to the center core. When configured as described above, that is, when the upper core 5 is formed not only with the hole 12 but also with the recess 13 having a larger area, the recess l3 is filled with a large amount of adhesive.
Since the adhesive area is large, the adhesive strength is high, and the magnetic disk main body 3a is firmly bonded and fixed to the center core. In particular, since the recess 13 is formed to be larger than the diameter of the hole 12, the adhesive hardens. After this, since the structure is such that the recessed portion is caught, there is no possibility that the adhesive will escape from the hole 12, and the magnetic disk main body 3a is firmly connected and fixed to the center core. Furthermore, since the concave portion l3 is formed, it is easy to fill with adhesive, and the workability of bonding the magnetic disk body portion 3a to the center core is good. FIG. 5 shows a second embodiment of the magnetic disk according to the present invention. FIG. 5(a) is a plan view of the main part of this magnetic disk, and FIG.
) is a cross-sectional view taken along line B-0-B in FIG. The magnetic disk 20 of this embodiment is basically the same as that of the previous embodiment. However, since the magnetic disk 20 of this embodiment is a so-called 3.5-inch type microfloppy, the center core 21 is not composed of an upper core and a core body as in the previous embodiment. 《As you can see from Part 5, it is composed of one part. A groove 23 is formed continuously or discontinuously (in this embodiment, discontinuously) on the surface of the flange 22 of the center core 21 facing the magnetic disk main body 20a, and a hole 24 is formed. It is formed. Then, the magnetic disk main body 20a is attached to the center core 2l.
When the adhesive is injected from the hole 24 after being pressed against the
The adhesive is guided through the hole 24 and filled into the groove 23, and the magnetic disk main body 20a is firmly adhered to the center core 21 in the same manner as in the previous embodiment.

【effect】

The magnetic disk according to the present invention is a magnetic disk in which a magnetic disk main body and a center core are bonded with an adhesive, and a recess for an adhesive reservoir is provided in a surface of the center core facing the magnetic disk main body. is formed, and a hole communicating with this recess is formed, and the size of the recess is larger than the diameter of this hole, so that the adhesive force between the magnetic disk main body and the center core is increased. is large, that is, if a recess with a larger area is formed than just a hole, a large amount of adhesive will be filled in the recess.
Because the adhesive area is large, the adhesive strength is high, and the magnetic disk body is firmly fixed to the center core.In particular, since the recess is formed to be larger than the diameter of the hole, the adhesive hardens. After this, the structure is such that the concave part gets caught and the adhesive does not come out through the hole, and the magnetic disk body is firmly connected and fixed to the center core, and furthermore, the concave part is formed. It is easy to fill with adhesive because of the adhesive, which improves the workability of bonding the magnetic disk body to the center core, and also reduces the protrusion of the adhesive used to bond the magnetic disk body and center core. It has the advantage that there is no problem of bonding, and there is no variation in the so-called adhesion height.

[Brief explanation of drawings]

1 to 4 show one embodiment of the magnetic disk according to the present invention, FIG. 1 is an exploded perspective view of the magnetic disk stored in a disk storage case, and FIG. 2 is a main part of the magnetic disk. 3 is an explanatory diagram of the stage before the magnetic disk body is bonded to the center core with adhesive, and Figure 4 is an explanatory diagram of the stage after the magnetic disk body is bonded to the center core with adhesive. 5 shows a second embodiment of the magnetic disk according to the present invention, FIG. 5(a) is a plan view of the main part of this magnetic disk, and FIG. A sectional view taken along the B-0-B line in a), and (c) in the same figure (
FIG. 6 is a sectional view taken along the C-O-C line in a), and FIGS. 6 and 7 are explanatory diagrams of a conventional magnetic disk. A... Disc storage game body, 1... Upper case,
2... Lower case, 2a... Recess, 3... Magnetic disk, 3a... Magnetic disk body, 3b... Opening, 4... Liner, 5... Upper core, 6 ... Core body, 7a, 7b-... Opening, 8a. 8b...Long hole, 9a...Concave portion, 10...Shunter member, 11.
...Protrusion, 12...hole, 13...recess, 14...
Flange part, 20... Magnetic disk, 20a... Magnetic disk main body part, 2l... Center core, 22... Flange part, 23
...concave groove, 24...hole.

Claims (1)

[Claims] A magnetic disk in which a magnetic disk main body and a center core are bonded together with an adhesive, and a recess for an adhesive reservoir is formed in a surface of the center core facing the magnetic disk main body. 1. A magnetic disk characterized in that a hole communicating with the hole is formed, and the size of the recess is larger than the diameter of the hole.