JPH0320944Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention consists of a disk case 1 as shown in the drawing.
In the disk cartridge cartridge, the disk 2 installed inside the disk is composed of a disk-shaped seat 9 and a hub 10 integrally connected to the center of the seat 9, and the hub 10 faces the drive shaft insertion window 3 of the disk case 1.
This is an improved spindle insertion hole provided at the center of the hub 10.

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, conventionally, on the inner peripheral edge of the spindle insertion hole 15,
Two internal contact points are formed in contact with the circular outer circumferential surface of the support shaft 21, and a spring material is provided at a portion opposite to these internal contact points, and another internal contact point that is elastically deformable in and out of the radial direction is attached to this spring material. It has been proposed that contacts are formed and alignment is performed by three-point contact between two fixed internal contacts and one movable internal contact.

However, in this conventional means, the spring material forming the movable internal contact is made of a linear plate spring material supported on both sides by the hub, and the movable internal contact is set at the center of this plate spring material. Therefore, the elastic modulus of this leaf spring material is relatively large, and the change in the amount of elastic deformation of the leaf spring material when the spindle is inserted due to processing errors or assembly errors of the leaf spring material will affect the contact spring load. This tended to be a large change, and the three-point contact support performance tended to be non-uniform depending on the disk.

This invention was proposed to solve this problem, and by making the spring material forming the movable internal contact into a cantilever arm that curves along the outer circumferential surface of the support shaft insertion hole, Although it can be configured compactly, the degree of freedom in setting the length of this cantilever arm is increased, and an appropriate spring constant can be set with less variation in contact load, resulting in uniform three-point contact support performance. The purpose is to achieve this goal.

The details will be explained below based on the drawings.

In FIGS. 1 and 2, the disc cartridge of the present invention is made of plastic upper and lower cases 1.
A flat rectangular hard case type disk case 1 formed by combining a and 1b into a lid and integrally bonding at several points by ultrasonic welding, and this disk case 1.
It consists of a magnetic disk 2 which is rotatably installed inside.

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 an arm 26 that is curved in an arc with the center of the support shaft insertion hole 15 as the center of curvature is integrally extended from one side wall surface 25 of the fan-shaped hole 24 in a cantilevered manner. A block-shaped head 26a facing toward the center of the spindle insertion hole 15 is integrally formed at the free end of the arm 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 internal contact point P ₁ that contacts the circular outer peripheral surface of
is formed.

The inner peripheral surface of the spindle insertion hole 15 itself has a partial boss 11 in a phase opposite to the inner contact point _P1 .
In (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 partial boss 11a of the upper hub structure 11 is fitted is vertically formed through the hole 27, and a partial boss 28 which is fitted into the fan-shaped hole 24 of the upper hub structure 11 is provided upright.
This partial boss 28 has a partial arc-shaped concave groove 29 into which the cantilever arm 26 engages radially outward and outward with a margin for deformation, and a vertically penetrating groove in which the cantilever arm head 26a engages with a margin for deformation. The recesses 30 are formed in a continuous manner, and the inner surface 28a of the partial boss 28 located inside the cantilever arm 26 constitutes a part of the circumferential surface of the support shaft 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 arm 26 and the spindle 21 are connected. Due to the contact, the cantilevered arm 26 is elastically deformed outward in the radial direction, and is in contact with the support shaft 21 at three points: the internal contact point P ₁ of the arm head 26a and the two fixed internal contact points P ₂ and P ₃ . In contrast, the hub 10 is elastically aligned. At this time, since the cantilever arm 26 has a long span, the relative pressing force of the support shaft 21 against the fixed internal contacts P ₂ and P ₃ is always guaranteed to be constant.

In the above embodiment, the cantilever arm 26 is integrally extended from the plastic hub 10, but a curved cantilever arm 26 made of different materials (for example, steel plate) with different strengths is formed separately. It may also be integrally coupled to the hub 10.

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.

As explained above, this invention has one elastically deformable movable internal contact P ₁ and two fixed internal contacts P ₂ ,
Hub 10 and spindle 21 in three-point contact using P ₃
Since the movable inner contact point P ₁ is formed on the free end side of the curved cantilever arm 26 provided along the circumference of the central shaft insertion hole 15, the cantilever arm 26 is Although it can be arranged without requiring a large space in the radial direction, its span is relatively long and can be set to a freely designed length, so the spring constant of the cantilever arm 26 can be selected to a small appropriate value. It becomes easier. As a result, even if there is a slight change in the amount of elastic deformation due to contact with the support shaft 21 due to manufacturing errors in the cantilever arm 26, there is little variation in the contact load at the internal contact point _P1 of this arm, resulting in three-point contact. The centering function can be made uniform for each disk, and the cantilever arm 26 can be prevented from becoming sagging even after long-term use. In particular, the cantilever arm 26 has a block-shaped head 26a at its free end facing toward the center of the spindle insertion hole 15, and the above-mentioned movable internal contact point _P1 is provided on the convexly curved inner peripheral surface of this head 26a. cantilever arm 2, even if there is a manufacturing error.
The curved intermediate portion of the arm 26 never comes into contact with the support shaft 21, and the movable inner contact _P1 of the head 26a always correctly contacts the support shaft 21 first, forming the arm 26 in a curved manner and extending the span. This means that you can definitely guarantee the benefits of earning money for a long time.

[Brief explanation of the drawing]

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. 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 ...
Cantilever arm, 26a... Head of cantilever arm.

Claims (1)

[Claims for Utility Model Registration] 1. 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 being a disc-shaped sheet. 9 and the sheet 9
A hub 10 is integrally connected to the center of the drive shaft and faces the drive shaft insertion window 3, and a spindle 21 on the magnetic recording device side is mounted in the center of the hub 10.
In a disk cartridge having a spindle insertion hole 15 into which the spindle 10 is inserted, the spindle insertion hole 15 is provided with two internal contact points P ₂ and P ₃ inscribed in the circular outer peripheral surface of the spindle 21, and the hub 10 A curved cantilever arm 26 is provided along the circumference of the spindle insertion hole 15, and the free end of this cantilever arm 26 is provided with a block-shaped head 26a facing toward the center of the spindle insertion hole 15. An inner contact point P 1 is formed on the convexly curved inner circumferential surface of the head 26 _a and contacts the circular outer circumferential surface of the support shaft 21 in a circumferential phase opposite to the inner contact points P ₂ and P ₃ . A disk cartridge characterized in that the support shaft 21 is positioned in contact with three internal contact points P ₁ , P _{2 ,} and P ₃ by elastic restoring force. 2. The disk cartridge according to claim 1, wherein the cantilever arm 26 is integrally extended from the plastic hub 10.