KR0140883B1 - Center core of magnetic disk - Google Patents

Abstract

None.

Description

Center core of magnetic disk

1 is a cross-sectional view showing the mounting operation of the magnetic disk on the spindle in the order (a) to (b).

2 is a plan view of a magnetic disk.

3 is a perspective view of the magnetic disk, a part of which is omitted.

4 is an enlarged cross-sectional view taken along the IV-lV line of FIG.

5 is an exploded perspective view of the magnetic disk.

6 is a perspective view of a magnetic disk cassette.

7 is an enlarged cross-sectional view taken along the Vll-Vll line in FIG.

8 is a sectional view showing a second embodiment of the center core of the magnetic disk of the present invention.

9 is a sectional view showing a modification of the center core of the magnetic disk of the present invention.

10 is a plan view showing an example of a center core of a conventional magnetic disk.

11 is a cross-sectional view taken along the line Xl-Xl of FIG.

* Explanation of symbols for the main parts of the drawings

1: magnetic disk 3: center core

3A: Center Core 3B: Center Core

10, 10: positioning pressing edge (= pressure surface)

28: leaf spring 32a: center portion (= bend) of the lower end (of leaf spring)

The present invention relates to the center core of a novel magnetic disk. More specifically, a center core having a coupling hole fixed in the center of the magnetic sheet and freely inserted in the disc drive shaft, in particular, a pressing surface provided in this coupling hole in an almost octagonal shape in the axial direction and the pressing surface It relates to the center core of the magnetic disk which is installed in the direction of the open and facing the drive shaft is inserted into the drive shaft to push the pressing surface to the drive shaft, and by studying the shape of the lower end of the leaf spring, It is an object of the present invention to provide a center core of a new magnetic disk, which prevents the leaf spring from being inserted into the top of the disk drive shaft when the disk drive shaft is mounted, so that the insertion of the disk drive shaft into the coupling hole can be performed smoothly.

The center core of the magnetic disk of the present invention has a coupling hole in which the coupling separation of the disc drive shaft is freely inserted, and faces the pressing surface provided in this coupling hole in an almost octagonal shape in the axial direction and in the opening direction of the pressing surface. A center core of a magnetic disk provided with a leaf spring for pushing the pressing surface to the driving shaft by inserting a drive shaft, and bending the lower end of the leaf spring toward the half pressing surface to insert the disk driving shaft into the engaging hole. The spring is not inserted into the top of the disc drive shaft, so that the disc drive shaft can be smoothly inserted into the engaging hole.

For example, a magnetic disk called a floppy disk is formed of a magnetic sheet having a circular shape and a center core fixed to a central portion thereof. The rotation is freely accommodated in a state where the center core reaches the outside. The center core is attached to a disk rotating portion provided in a magnetic disk driver or the like.

Therefore, there are various kinds of such center cores. For example, in the center core of a magnetic disk known as a so-called 2-inch floppy disk, the disk drive shaft is inserted into its coupling hole, that is, a hole into which the disk drive shaft is freely coupled. There is provided a pressurization surface for centering the center of the center core and the shaft center of the disk drive shaft, the so-called centering, and a leaf spring for pushing the pressure surface to the disk drive shaft.

The magnetic disk provided with such a center core is shown, for example, Unexamined-Japanese-Patent No. 59-138063. 10 and 11 show an outline of the magnetic disk described in the above publication.

In the figure, a is a magnetic disk, b is a magnetic sheet, c is a center core fixed to the center of the magnetic sheet b, d is a coupling hole of the center core c, and an inner circumferential surface of the coupling hole d In the axial direction, two pressing surfaces (e, e) provided in an almost octagonal shape and leaf springs (f) facing each other in the opening direction thereof are provided on the pressing surfaces (e, e). In the longitudinal direction, f) is supported by grooves g and g formed on the inner circumferential surface of the engaging hole in the longitudinal direction so as to bend in the plate thickness direction, that is, the direction with respect to the pressing surfaces e and e.

Therefore, such a magnetic disk a is freely rotated in a cassette case (not shown). When the cassette case is mounted on the cassette mounting portion of the magnetic disk driver, the disc drive shaft h provided on this cassette mounting portion is relatively relative. Is inserted into the engaging hole d of the center core c. At this time, the pressing surface (e, e) and the lower end face (i) of the leaf spring (f) is moved downwards against the slope (k) of the top (j) of the disk drive shaft (h) almost the conical shape The spring f is bent toward the half pressing surfaces e and e, and the pressing surfaces e and e are pushed against the outer circumferential surface of the disk drive shaft h so that the center of the magnetic disk a and the shaft center of the disk drive shaft h are Positioning with, i.e., centering is performed. In addition, the center core c is chucked to the disk mounting plate as the magnetic plate 1 provided thereon is attracted to the magnet supported on the disk mounting plate (not shown), which is fixed to the disk drive shaft h.

In such a center core (c), the leaf spring (f) is caught by the top (j) of the disk drive shaft (h), there is a problem that chucking and centering is impossible. That is, when the disc drive shaft h is inserted into the engaging hole d of the center core c, the lower end i of the leaf spring f is formed on the slope k of the top j of the disc drive shaft h. But also, in some cases, the lower end (i) is first opposed to the top surface (m) of the top (j), then the center core (c) is moved laterally to meet the slope (k), where The edge of the lower end (i) of the edge may be inserted into the slope (k) or the top surface (m), and in this state, the center core (c) will not be able to move downward, so that the disk drive shaft (h) is engaged. Insertion into the hole d becomes impossible.

In addition, when the lower end i of the leaf spring f is fitted to the top j of the disc drive shaft h, a groove is formed therein. The tendency for (f) to be caught where the groove is located becomes impossible to chuck.

Therein, the center core of the magnetic disk of the present invention is bent toward the semi-pressurization surface side of the center of the lower end of the leaf spring provided in the engaging hole.

Therefore, according to the center core of the magnetic disk of the present invention, when the disk drive shaft is inserted during the engagement of the center core, when the lower end of the leaf spring of the center core is against the top surface or the slope of the top of the disk drive shaft, Since almost the center of the lower end is bent toward the semi-pressurization surface and there is no edge fitted to the top of the disc drive shaft, insertion of the disc drive shaft into the engaging hole is performed smoothly.

Next, the center core of the magnetic disk of the present invention will be described according to each embodiment.

1 to 7 show a first embodiment of the center core of the magnetic disk of the present invention.

(1) is a magnetic disk, and is formed of a magnetic sheet and a center core fixed to the center of the magnetic sheet.

(2) is a magnetic sheet. The magnetic sheet 2 is formed by forming a magnetic layer on the surface of a sheet-like synthetic resin. The magnetic sheet 2 has a circular shape and a circular engaging hole 2a is formed in the center thereof.

Numeral 3 denotes a center core, which is formed of a core base formed of a magnetic body, a hub fixed to outer core molding of a synthetic resin on the core base, a spacer ring, and a seat fixing cap inserted into the hub.

Numeral 4 denotes a core base, which has a disk shape having an outer diameter slightly larger than the diameter of the engaging hole 2a of the magnetic sheet 2, and has a plurality of fixing holes 5 arranged in the circumferential direction at a portion deviated from the outer peripheral edge thereof. , 5 ‥ ... (see Fig. 5) is formed, and the part between the pair of holes 5 and 5 adjacent to each other among these fixing holes 5 and 5 ... As it is pushed downward, the recesses 6 and 6 are formed on the upper surface thereof.

(7) is a hole formed in the center of the core base (4), the inner edge of the hole (7) of the parallel portion edges 8, 8 'and the parallel portion edges 8, 8' The non-parallel edges 9, 9 'extending in a direction slightly inclined with respect to the opposing direction and the one (8) and the non-parallel edges 9, 9' of the parallel edges 8, 8 '. It is formed with positioning pressing edges 10, 10 and the like located between one end and the positioning pressing edges 10, 10, so that the core base 4 can be unwound with reference to the first and seventh views. ) Is viewed so as to face the edge of the parallel portion 8 'on the other side in an approximately octagonal shape in the thickness direction. Further, a cutout portion 8'a is formed at the center of the other parallel portion edge 8 ', and a projection 11 is formed in a granular shape at the edge of the cutout portion 8'a. Again, the ends of the parallel part edges 8 'on the other side of the non-parallel part edges 9, 9' are bent in a substantially crank shape, and one parallel part edge of the crank-shaped part ( The edges 12 and 12 (henceforth spring support edges) which face 8 side become a part which supports the leaf spring mentioned later.

(13) is a hub of the center core (3), a flange (15) extending laterally from the center in the axial direction of the ring-shaped main portion (14) and the outer peripheral surface of the main portion (14) and having a circular outer edge. ) Is integrally formed by synthetic resin, and the flange 15 has an outer diameter equal to the inner diameter of the engaging hole 2a of the magnetic sheet 2.

Therefore, the hole 16 of the main part 14 is a disk drive shaft which will be mentioned later is a coupling hole into which coupling | bonding separation is inserted freely, and the inner surface of this coupling hole 16 is substantially hexagonal from an axial direction. In other words, the inner surfaces of the engaging holes 16 face each other in parallel and are continuous at both ends of the parallel part surfaces 17 and 17 'and the short ends 17 of the parallel part surfaces 17 and 17'. And octagonal partial surfaces 18 and 18 facing open in a substantially octagonal direction toward the longitudinal parallel surface 17 'of the length piece, and the parallel partial surface 17' with these octagonal partial surfaces 18 and 18. ) And the end faces 19, 19, etc., which are positioned between the end faces of the parallel face 17 'of the long side of the face 19, 19. A spring engaging cutout groove 20, 20 is formed which extends almost in the opposite direction and extends almost in the center of the end and extends substantially parallel to the parallel portion surfaces 17, 17 '. The outer edge of the fitting cutout grooves 20 and 20 reaches the flange 15.

Reference numeral 21 is a groove formed in a portion of the portion extending to the hole edge of the coupling hole 16 on the upper surface of the main portion 14 except for the hole edge corresponding to the long parallel portion 17 '.

Such a hub 13 is externally shaped to the core base 4 such that the upper portion protrudes from the upper surface of the core base 4 at a portion corresponding to the lower surface of the flange 15 (FIG. 5). In the state separated from the core base 4), as shown in FIG. 1, the central hole of the core base 4 at a position inclined toward the lower end of the outer circumferential wall of the main portion 14 The hole edge of 7) is fixed to the core base 4 so as to be located in a buried shape.

Therefore, the inner edge of the central hole 7 of the core base 4 is embedded in the hub 13, most of which is embedded in the hub 13, as shown in FIG. 13 is positioned so as to project slightly in the circumferential direction of the octagonal partial surfaces 18 and 18 of the engagement hole 16 of 13) at a position slightly biased to the slightly lower end of the center, and the spring supporting edges 12 and 12 are springs. The upper end surface of the projection 11 of the core base 4 protrudes to the center in the width direction of the engaging cutting grooves 20 and 20, and the outer peripheral edge and the longer side of the upper surface of the main portion 14. It is exposed by the part between parallel part surface 17 '.

Further, a portion of the lower surface of the main portion 14, which is continuous to the long parallel portion 17 ', has a shallow recess 22 extending from the parallel portion surface 17' to the outer circumferential surface of the main portion 14 (first). Fig. 5) is formed.

(23) is a seat fixing cap of the center core (3), a ring-shaped engaging portion (24) having an inner diameter substantially equal to the outer diameter of the main portion (14) of the hub (13) and the lower end of the engaging portion (24). Flange 25 extending laterally and having a circular outer shape is integrally formed by a synthetic resin, and the lower portion 26a of the central hole 26 is larger in diameter than the upper portion.

Accordingly, the seat fixing cap 23 has a hub (3) in the center hole 26 of the magnetic sheet 2 in a state where the coupling insertion hole 2a of the magnetic sheet 2 is externally inserted into the flange 15 of the hub 13. The main part 14 of 13 is inserted inside and fixed to the hub 13 by fixing means such as adhesion or ultrasonic welding in that state. The flange 15 of the hub 13 is inserted into the large diameter portion 26a of the center hole 26 of the seat fixing cap 23.

Therefore, the integrated product of the core base 4 and the hub 13 and the seat fixing cap 23 are fixed to each other along the periphery of the engaging insertion hole 2a of the magnetic sheet 2.

(27) is a spacer ring of the center core (3), has an outer diameter slightly smaller than the outer diameter of the core base (4), and in the same shaft state as the hub (13), the outer end molding on the lower surface of the core base (4) This figure is also shown in the state separated from the core base 4 in FIG. 5), and the lower end surface is in the position slightly lower than the lower surface of the hub 13. As shown in FIG. In addition, the spacer ring 27 is integrated with the core base 4 while a part thereof is located in the fixing holes 5, 5... And recesses 6, 6... Which are formed in the core base 4. It is.

Reference numeral 28 is a leaf spring of the center core 3. The plate sprin 28 is formed of an integrally formed main part 29 which is almost rectangular and supporting parts 30 and 30 protruding from almost the center of both edges in the longitudinal direction of the main part 29. 29) Cutouts 31a and 31a are formed at positions biased to both ends of the lower end 31 so that the portion 32 between the cutouts 31a and 31a (hereinafter, referred to as a lower center piece) has a lower end 32a. (Hereinafter, referred to as a bent portion) is bent toward the downward inclined plate thickness direction of the leaf spring 28.

Thus, this leaf spring 28 is supported on the hub 13, the core base 4 and the seat fixing cap 23 as follows. That is, the leaf spring 28 has its support portions 30 and 30 such that the bent portion 32a faces the octagonal part surfaces 18 and 18 of the engagement hole 16 of the hub 13. The upper surface of the core base (4) is located toward the spring support edge (12, 12) is installed in the portion exposed in the spring engaging cutout groove (20, 20) of the hub 13, and both ends of the main portion (29) The support portion 30 is provided between the inner surface of the four-sided cutout grooves 20 and 20 toward the eight-shaped partial surfaces 18 and 18 and the spring support edges 12 and 12 of the core base 4. The upper surface of the large-diameter portion 26a of the center hole 26 of the seat fixing cap 23 is faced upward at 30. As a result, the leaf springs 28 prevent the operation in the width direction while the support portions 30 and 30 are fitted in the width direction by the core base 4 and the seat fixing cap 23, thereby for spring engagement. The inner end surfaces of the cutting grooves 20 and 20 almost restrict the operation in the longitudinal direction, and in the longitudinal direction of the main portion 29, both ends are 八 -shaped of the cutting grooves 20 and 20 for spring engagement. It is interposed by the inner side of the side faces 18 and 18 and the spring supporting edges 12 and 12 of the core base 4, thereby preventing operation in the plate thickness direction.

Accordingly, the leaf spring 28 is provided in the engaging hole 16 of the hub 13 and is positioned opposite to the positioning pressing edges 10 and 10 in their open direction, and at the same time as the bent portion ( 32a) is in a bent state facing away from the positioning pressing edges 10 and 10.

Numeral 33 is a magnetic disk cassette provided with the magnetic disk 1 configured as described above.

34 is a cassette case of the magnetic disk cassette 33, and the two case hubs 35 and 36 are integrally combined to form a relatively thin box, and are substantially centered on two walls facing in the thickness direction. Drive shaft insertion holes 37, 37 coaxial with each other, the head insertion windows 38, 38 are positioned at one edge, and the position fixing holes 39, 39 'are positioned at the other edge. Each of the shutters 40 (shown in a state in which the windows 38 and 38 are opened in the drawing), which are formed to open and close the windows 38 and 38, are freely supported by sliding motion.

Accordingly, the magnetic disk 1 is freely rotated in the cassette case 34, and the center core 3 extends outward from the drive shaft insertion holes 37 and 37. As shown in FIG.

In addition, the shutter 40 closes the windows 38 and 38 while the magnetic disk cassette is not in use, and moves to the position to open the windows 38 and 38 when the magnetic disk cassette is mounted.

Reference numeral 41 denotes a recording / reproducing section (see FIG. 1) of a magnetic disk driver or the like, 42 denotes a spindle rotated by a motor (not shown), 43 denotes a turntable of the spindle 42, and 44 denotes the A disc drive shaft having a top portion 45 protruding upward from the center of the turntable 43 and having a substantially conical shape, 46 is a chucking magnet fixed to an upper surface of the turntable 43, 47 is a magnetic disk cassette ( 33) is a cassette carrier which is freely mounted.

In addition, a portion other than the top 45 of the disc drive shaft 44 is a circle external to the two positioning pressing edges 10 and 10 and the leaf spring 28 provided in the engaging hole 16 of the center core 3. It has a slightly larger diameter.

Therein, when the cassette carrier 47 comes to the cassette mounting position of the recording / playback section 41 with the magnetic disk cassette 33 mounted, positioning means not shown is shown for the cassette case 34. And the disc drive shaft 44 is relatively inserted into the coupling hole 16 of the center core 3 of the magnetic disc 1. That is, the magnetic disk cassette 33 is moved toward the spindle 42 in a state where the coupling hole 16 of the center core 3 of the magnetic disk 1 substantially coaxially faces the disk drive shaft 44. In the place where the disc cassette 33 has come to the position just before reaching the cassette loading position, as shown in FIG. 1 (a), the top 45 of the disc drive shaft 44 is inserted into the engaging hole 16. A part of the lower hole edge of the coupling hole 16 and the bent portion 32a of the lower center piece 32 of the leaf spring 28 abut against the slope 45a of the top portion 46 to form the leaf spring 28. The main portion 29 of is pressed by the top portion 46 and bent toward the semi-positioning pressing edges 10 and 10, whereby the center core 3 is added in the direction in which the leaf spring 28 is bent as described above. Therefore, the position fixing pressing edges 10 and 10 are pushed to the outer circumferential surface of the disc drive shaft 44. . In addition, at this time, the bend part 32a enters into the recessed part 22 formed in the lower surface of the hub 13, as shown to FIG. 1 (b).

Therefore, if the center core 3 is installed on the turntable 43 immediately before the magnetic risk cassette 33 reaches the cassette mounting position, the center core 3 has the spacer ring 27 of the turntable 43 at this time. Since the core base 4 formed in contact with the upper surface and made of magnetic material is attracted to the magnet 46, the center core 3 is pressed against the turntable 43 (FIG. 1 (b) shows this state). ). As a result, the magnetic disk 1 is chucked to the spindle 42, and in this state, the insertion of the disk drive shaft 44 into the engaging hole 16 is completed. Therefore, the two positioning pressing edges 10 and 10 of the engaging hole 16 of the center core 3 are pushed to the outer peripheral surface other than the top 45 of the disc drive shaft 44 with elasticity of appropriate strength, This results in centering of the spindle 42 of the magnetic disk 1.

As such, when the magnetic disk 1 is chucked to the spindle 42, in its initial state, the lower end of the leaf spring 28 abuts the top 46 of the disk drive shaft 44, but the leaf spring 28 is bent. Since the portion 32a is bent toward the half-position fixed pressing edges 10 and 10, the edge of the leaf spring 28 does not face the top 45. Therefore, the lower end of the leaf spring 28 does not penetrate the outer surface of the top part 45 when it is against the top part 45, and makes the slope 45a of the top part 45 slide smoothly.

8 shows a second embodiment 3A of the center core of the magnetic disk of the present invention.

The center core 3A shown in this second embodiment differs from the center core 3 shown in the first embodiment only in the shape of the lower end of the leaf spring. Therefore, the description will be made only for the above-mentioned differences, and the rest of the drawings will be omitted by attaching the same reference numerals as those attached to the same portions in the first embodiment to the respective portions of the drawings. The usage of such a code | symbol is the same also in the modification mentioned later.

48 and 48 are cutouts formed in the lower center piece 32 of the leaf spring 28, and both ends of the center piece 32 are located at a portion other than the center in the longitudinal direction of the upper end of the center piece 32 in the longitudinal direction. It is formed so as to reach the edge, whereby the central piece 32 is the central piece 32 of the main part 29 via the continuous part 49 in the shape of a neck between the two cutouts 48, 48. Since it is continuous with another part, even if there is the bending part 32a, the spring constant of the leaf spring 28 can be prevented from becoming large too much. That is, when the bent part 32a bent in the plate | board thickness direction is formed in the plate | board spring 28, since rigidity becomes remarkably high in the plate | board thickness direction of the plate spring 28, a spring constant becomes large and a disc drive shaft ( The insertion of the coupling hole 16 into the overlapping hole 44 is likely to be incomplete, resulting in incomplete chucking or inaccurate centering. For this reason, in the first embodiment, the leaf spring 28 is made thinner than the material used for the conventional leaf spring f. However, since the plastic deformation of the material itself is increased, the leaf spring 28 In the main part 29 of the 28, there exists a possibility that a wrinkle may arise at the boundary position of the both ends supported by the hub 13 and the core base 4, and the part between them. However, in this second embodiment, since the above cutouts 48 and 48 are provided in the lower center piece 32, the rigidity of portions other than the lower end piece 32 of the leaf spring 28 is reduced. It rarely rises. Therefore, a material having the same thickness as that of the conventional leaf spring f can be used for the leaf spring 28.

9 shows a modification 3B of the center core of the magnetic disk of the present invention. The center core 3B shown in this modification differs from the center core 3 in the first embodiment only in the shape of the bent portion at the lower center portion of the leaf spring.

That is, 50 is the bent portion of the lower end piece 32 of the leaf spring 23, and this bent portion 50 is a portion 50a that extends toward the downward inclined side by viewing the leaf spring 28 in the longitudinal direction. (This portion corresponds to the bent portion 32a of the leaf spring 28 in the first embodiment) and the portion 50b extending toward the inclined upward direction from the lower end of the portion 50a. It is almost V-shaped. Therefore, since the lower end surface of this bent part 50 does not have an edge, when the leaf spring 28 abuts against the top part 45 of the disc drive shaft 44, the slope 45a or the top surface (of this top part 45) ( 45b) can be prevented more reliably.

As is apparent from the foregoing, the center core of the magnetic disk of the present invention includes a pressing surface having a coupling hole in which the disc drive shaft is freely inserted and freely inserted into the coupling hole in an approximately eight-shape view in the axial direction. A center core of a magnetic disk provided with a leaf spring for facing the pressing surface in the open direction and pushing the driving surface to the driving shaft, wherein the center of the lower end of the leaf spring is bent toward the semi-pressurization portion. It features.

Therefore, according to the center core of the magnetic disk of the present invention, when the disk drive shaft is inserted into the engagement hole of the center core, the lower end of the leaf spring when the lower end of the leaf spring of the center core abuts the top surface or the inclined surface of the top of the disk drive shaft Since the center of the bend is bent toward the semi-pressurization surface, the edge fitted to the top of the disc drive shaft is eliminated, so that the disc drive shaft is smoothly inserted into the engaging hole.

Therefore, according to the center core of the magnetic disk of the present invention, when the disc drive shaft is inserted into the engaging hole, the leaf spring is inserted into the slope or the top surface of the disc drive shaft, so that the center core becomes impossible to move with respect to the disc drive shaft. No magnetic disk is attached and centered smoothly, and the leaf spring does not hurt the top of the disk drive shaft.

Further, in the above embodiment, the center core is constituted by a core made of magnetic material and a synthetic resin hub having a coupling hole, and at the same time, the pressing surface is provided on the core base, and the inner peripheral surface of the coupling hole of the hub is provided. In the present invention, the pressing surface may be formed integrally with the hub, that is, directly installed on the inner circumferential surface of the coupling hole.

Claims (1)

The disk drive shaft has a coupling hole into which the coupling separation can be freely inserted, and the pressing surface facing the opening surface of the pressing surface 10 and the pressing surface 10 provided in the shape of an eight shape in the axial direction in the coupling hole, and the pressing surface as the drive shaft is inserted. A center core of a magnetic disk provided with a leaf spring (28) for pressurizing the shaft by a drive shaft, wherein the bent portion (32a) of the leaf spring is bent toward the half pressing portion side.

Images