JPH0320945Y2 - - Google Patents

Description

[Detailed description of the invention] In this invention, as shown in FIG. 1, a disk 2 housed in a disk case 1 consists of a disc-shaped seat 9 and a hub 10 integrally connected to the center of the seat 9. The object is a disk cartridge in which the drive shaft insertion window 3 of the disk case 1 faces the drive shaft insertion window 3 of the disk case 1.

In this type of disk cartridge, the spindle 21 on the magnetic recording device side is inserted into the spindle insertion hole 15 provided at the center of the hub 10, as shown in FIG.
A driving pin 22 on the magnetic recording device side engages with an engaging portion 17 provided at one location on the outer periphery of the end face of the hub, thereby rotationally driving the magnetic disk 2.

In such a drive mode, the problem is how to properly support the disk 2 with respect to the support shaft 21 in order to prevent track deviation.

Therefore, two fixed internal contacts are formed on the inner periphery of the spindle insertion hole 15 in contact with the circular outer circumferential surface of the spindle 21, and a spring material 26 is provided at a portion facing these internal contacts. Another movable inner contact that can be elastically deformed inward and outward in the radial direction is formed at
Attempts have been made to perform center alignment through three-point contact between fixed internal contacts and one movable internal contact.

However, it is desirable that the spring material 26 used here has a constant spring constant even if the amount of deformation when elastically deformed in the radial direction due to manufacturing errors etc. is large or small. The relative pressing force to the fixed inner contact point must be as light as 100 g or less, and the wall thickness of the spring material 26 is extremely thin. However, since the spring material 26 is exposed on the upper and lower surfaces of the hub 10, it may contact and interfere with one end of the spring material 26 when the support shaft 21 is inserted, or an external force may be generated by accidentally pressing it with another object such as a fingertip. When applied to the spring material 26 in the axial direction, the spring material 26 easily deforms and
Easy to destroy. Even if it does not reach that point, the spring pressure will change.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disk cartridge equipped with a hub 10 that can effectively protect the spring material 26 by preventing undue external force from being applied to the spring material 26 in the axial direction.

In order to achieve the above object, the present invention provides a disc cartridge equipped with a hub 10 having the above-mentioned spring material 26.
A guard wall 31 is provided on at least one of the upper and lower ends of the inner circumferential surface of the spindle insertion hole 15, the inner abutting surface 31a of which is close to and opposite to the upper and lower ends of the spring member 26.

The details will be explained below based on the drawings.

In FIGS. 1 and 2, the disk cartridge of the present invention is made of plastic upper and lower cases 1.
It consists of a flat rectangular hard case type disk case 1 which is made up of lids a and 1b that are joined together by ultrasonic welding at several places, and a magnetic disk 2 which is rotatably installed inside this disk case 1. Become.

The disk case 1 has a drive shaft insertion window 3 located approximately in the center near the front thereof, and a magnetic head insertion window 4 located in front of the drive shaft insertion window 3 and long from front to back.
, a small diameter index hole 5 located behind the drive shaft insertion window 3, positioning holes 6, 6 with different diameters on the left and right located on the front left and right, and opening and closing members located on the front left and right and mounted inside the case. It has write protection holes 7, 7 that are operated, and these windows and holes are provided vertically through each other.

The disk 2 consists of a disk-shaped magnetic sheet 9 having a hole in the center, and a hub 10 that clamps the peripheral edge of the center hole of the sheet 9.

3 to 7, the hub 10 of the disk 2 consists of an upper hub structure 11 and a lower hub structure 12, which are separately molded from plastic. Both hub components 11 and 12 are inseparably connected by passing three connecting pins 13 protruding from the upper hub component 11 into the connecting holes 14 of the lower hub component 12 and caulking them. The peripheral edge of the center hole of the seat 9 is held by the opposing surfaces of the hub structures 11 and 12.

A semi-cylindrical partial boss 11a extending to the lower surface of the lower hub structure 12 is provided at the center of the upper hub structure 11.
The support shaft insertion hole 15 is formed in a vertically penetrating shape. Further, annular guide grooves 16, 16 are formed in the upper and lower end surfaces of each hub component 11, 12 on the outer periphery around the center of the spindle insertion hole 15, and this guide groove 16 is formed at one location in the circumferential direction of each guide groove 16. Ribs 17 that cross the are vertically symmetrical. In such a case, when the disk cartridge of the present invention is loaded into the magnetic recording device, the support shaft 21 on the magnetic recording device side will be moved as shown in FIG.
The drive pin 22, which is arranged eccentrically with respect to the shaft 21, engages in the support shaft insertion hole 15 and the guide groove 16, respectively. In the magnetic recording device, these support shafts 21 and drive pins 22 are erected on a hub receiver 20 that is rotationally driven.
The hub 10 receives and supports a partially arc-shaped reference surface 23 protrudingly formed at the trisecting point position of the upper and lower end surfaces of the hub 10. Therefore, when the drive pin 22 rotates around the support shaft 21, the drive pin 22 moves within the guide groove 16 and comes into abutting engagement with the rib 17.
This drives disk 2 to rotate.

Support shaft insertion hole 1 provided in the upper hub component 11
A fan-shaped hole 24 with a relatively large center angle (approximately 150°) is formed in a part of the circumference of the part 5 (a position opposite to the partial boss 11a).
are provided in the vertical direction, and a spring member 26 is integrally cantilevered from one side wall surface 25 of the fan-shaped hole 24 and is curved in an arc shape with the center of curvature at the center of the support shaft insertion hole 15. A block-shaped head 26a facing toward the center of the spindle insertion hole 15 is integrally formed at the free end of the member 26, and the spindle 21 inserted into the spindle insertion hole 15 is formed on the convexly curved inner peripheral surface of this head 26a.
One inner contact point P ₁ is formed which contacts the circular outer circumferential surface of.

The inner peripheral surface of the spindle insertion hole 15 itself has a partial boss 11 at a phase opposite to the inner contact point _P1 .
(a), two internal contact points P ₂ and P ₃ that contact the circular outer circumferential surface of the support shaft 21 are formed.

The lower hub structure 12 includes an upper hub structure 1.
A hole 27 into which the first partial boss 11a fits is formed vertically through the hole 27, and a partial boss 28, which fits into the fan-shaped hole 24 of the upper hub structure 11, is provided upright.
A partially arc-shaped concave groove 2 in which the spring material 26 engages with this partial boss 28 with a deformation margin in the radial direction inside and outside.
9 is formed, and a radially inner portion of one end of this recessed groove 29 is cut out, and a spring head 26a is disposed in this cutout portion 30 with a margin for displacement in the radial direction. The bottom wall of the recessed groove 29 extending inward from the lower end of the partial boss 28 is a guard wall 31, and the inner abutment surface 31a of this guard wall 31 is closely opposed to the lower end of the spring member 26. The inner abutment surface 28a of the partial boss 28 constitutes a part of the circumferential surface of the spindle insertion hole 15.

When the disk cartridge configured as described above is loaded into a magnetic recording device and the spindle 21 on the magnetic recording device side is inserted into the spindle insertion hole 15 of the hub 10, the head 26a of the cantilever spring member 26 and the spindle 21 are inserted. The spring material 26 is elastically deformed radially outward due to the contact between the inner contact point P ₁ of the head 26a and the two fixed inner contact points P ₂ and P ₃ .
The hub 10 is elastically centered with respect to the support shaft 21 in the three-point contact state.

The spring material 26 in the recessed groove 29 is not pressed upward at least from below due to the interposition of the bottom wall 31. Further, even if pushed from above, the lower end of the spring member 26 is closely opposed to the contact surface 31a of the guard wall 31, so that it is received and supported by the guard wall 31 and does not deform significantly downward. Furthermore, the inner abutment surface 28a of the partial boss 28 is provided with a spring material 26.
The contact prevents the spring member 26 from being pressed outward in the radial direction, and also prevents the spring member 26 from being pushed outward in the radial direction more than necessary via the spring head 26a.

Although the illustrated example is as described above, the present invention is not limited thereto. for example,
As shown in FIG. 8, a separate abutment member 32 is provided above the partial boss 28, and the inner abutment surface 32a is closely opposed to the upper end of the spring member 26, so that the spring member 26 receives an external force in the axial direction. In particular, it may be possible to prevent this more reliably.

Furthermore, in the illustrated example, the spring material 26 is molded integrally with the hub 10 in plastic to reduce the number of parts, but the spring material 26 is made separately from a steel plate or the like and then joined to the hub 10. Good too.

In addition, in the illustrated example, the rib 1 provided in the guide groove 16
The drive pin 22 on the magnetic recording device side abuts and engages with the drive pin 22 on the magnetic recording device side.
It may also be something that rotates. The magnetic recording device may have only the support shaft 21 and no drive pin 22, and the hub 10 may be driven to rotate by, for example, a magnetic chuck method.

According to the present invention as described above, the inner peripheral surface of the spindle insertion hole 15 of the hub 10 is provided with a guard wall 31 at at least one of the upper and lower ends, so that the hub 10 is protected by the guard wall 31. The support shaft 21 and other objects do not directly touch the spring material 26 from either the upper or lower side, and the spring material 2
No axial deformation occurs in 6. hub 10
If the support shaft 21 and other objects are attached to the spring material 2 from the other side,
6, the other end of the spring material 26 is closely opposed to the inner contact surface 31a of the guard wall 31, so the spring material 26 may also be pushed in the axial direction and deformed. do not have. Therefore, the function of centering the hub 10 with respect to the support shaft 21 by the elastic force of the spring member 26 can be reliably guaranteed over a long period of time.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an example of a disk cartridge to which the present invention is applied, and FIG. 2 is a sectional view taken along the line -- in FIG. Fig. 3 is an exploded perspective view of the hub, which is one of the constituent members of the present invention, Fig. 4 is a plan view of the hub, and Fig. 5 is the same as in Fig. 4.
6 is a cross-sectional view taken along the line -- in FIG. 4, and FIG. 7 is a plan view of the hub seen from below.
FIG. 8 is a sectional view corresponding to FIG. 5, showing another embodiment of the present invention. 1...Disk case, 2...Disk, 3...
...Drive shaft insertion window, 4...Magnetic head insertion window, 9...
... Seat, 10 ... Hub, 15 ... Support shaft insertion hole, 21 ... Support shaft, 22 ... Drive pin, 26 ...
Spring material, 26a... head of spring material. 28a, 31
a, 32a...Contact surface, _P1 ...Movable inner contact, _P2 ,
P ₃ ...Fixed internal contact.

Claims (1)

[Claims for Utility Model Registration] Comprising a disk case 1 having a drive shaft insertion window 3 and a magnetic head insertion window 4, and a disk 2 rotatably installed inside the disk case 1, the disk 2 has a disk-shaped seat 9. and a hub 10 that is integrally connected to the center of the seat 9 and faces the drive shaft insertion window 3, and has a spindle insertion hole 15 in the center of which the spindle 21 of the magnetic recording device side is inserted. Two fixed inner contacts P ₂ and P ₃ are formed in the support shaft insertion hole 15 and are inscribed in the circular outer peripheral surface of the support shaft 21, and the support shaft is supported in a cantilevered manner by the support shaft insertion hole 15. A spring member 26 is arranged to be elastically deformable in the radial direction, and the inner contact points P ₂ and P ₃ are located on the free end side of the spring member 26.
A movable inner contact point _P1 is formed in contact with the circular outer peripheral surface of the support shaft 21 in a circumferential phase substantially opposite to the inner contact surface 31a at at least one of the upper and lower ends of the inner peripheral surface of the support shaft insertion hole 15. A disk cartridge characterized in that a guard wall 31 is provided at one end of the upper and lower ends of the spring material 26 in close opposition to each other.