JPH0883456A - Disk loading device - Google Patents

Abstract

PURPOSE: To enable the positioning of a magnetic disk body with a simple structure and to attain the thinning and miniaturization of a disk driving device as to the disk loading device for loading the magnetic disk housed in a cartridge on a rotary table of the device. CONSTITUTION: A tapered surface 21 and a restraining part 22 are formed on the outer circumference of the rotary table 11, and a vertically movable ring 24 is provided on the tapered surface 21. A tapered part 19 having the inclined angle θ2 slightly larger than an inclined angle θ1 of the tapered surface 21 of the rotary table 11 is provided on a core metal 17 arranged at the center of the magnetic disk 3, then the disk is loaded and positioned in such a manner that the tapered part 19 of the core metal 17 abuts on the ring 24 to push down the ring 24 at the time of loading the cartridge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mounting a magnetic disk cartridge containing a magnetic disk for magnetically recording image data such as still picture information on a recording / reproducing apparatus.

[0002]

2. Description of the Related Art FIG. 4A shows a conventional magnetic disk card.
FIG. 4B is an enlarged plan view of a part of the tridge in a sectional view, and FIG.

A magnetic disk body 2 is rotatably housed in a cartridge case 1 made of synthetic resin. The magnetic disk body 2 includes a toroidal magnetic disk 3 and a center core 5 made of synthetic resin, which is provided on an annular magnetic body 4 by outsert molding and has the magnetic disk 3 fixed to an outer peripheral portion thereof. A plate for pressing the disc drive shaft inserted in the disc drive shaft insertion hole 6 formed in the center core 5 against the pair of positioning surfaces 6a, 6b formed in the drive shaft insertion hole 6 It consists of a spring 7. Further, when the disk cartridge is transported, the magnetic disk body 2 is excessively offset to one side to the center core 5, and the outer peripheral portion of the magnetic disk 3 comes into contact with the inner surface of the cartridge case 1. A restriction rib 8 is provided to prevent damage.

Although not shown, the magnetic disk 3 is composed of a base film such as a polyester film and a magnetic layer formed on one side or both sides of the base film. 9
Is a part of a disk drive in the recording / reproducing apparatus, and includes a spindle 10, a turntable 11 made of a non-magnetic material, and a ring-shaped permanent magnet 13 installed inside a circular groove 12 formed on the turntable 11. The rotary table 11 has a strong fitting with the spindle and the drive shaft insertion hole 6
Disk drive shaft 15 provided with a guide taper portion 14
And a top surface 16 on which the magnetic plate 4 of the magnetic disk body 2 is attached by suction is formed.

Therefore, as shown in FIG. 4 (a), the magnetic disk body 2 is positioned in the thickness direction by utilizing the magnetic attraction of the annular magnetic body 4 and the permanent magnet 13 to make the top surface 1 of the rotary table 11.
6 and the centering of the magnetic disk body is shown in FIG.
As shown in (b), the elastic force of the leaf spring 7 provided in the insertion hole of the magnetic disk cartridge presses the pair of positioning surfaces 6a and 6b against the disk drive shaft 15.

[0006]

However, in the above-mentioned conventional structure, the magnetic core 4 is provided on the center core 5 made of synthetic resin.
Since the plate spring 7 and the leaf spring 7 are separately provided, the number of parts is large, the structure is complicated, and the number of assembling steps is large. The present invention eliminates the above-mentioned conventional drawbacks, has a simple structure,
(EN) A disc cartridge and a disc mounting device which can be made thin and compact.

[0007]

In order to achieve this object, the disk drive apparatus of the present invention is provided with an upward taper surface on the outer periphery of a rotary table provided at the end of the spindle, and on the taper surface. Is inserted into the outer circumference of the rotary table, and the core of the magnetic disk body has a taper surface that engages with the taper surface of the rotary table.

[0008]

According to the present invention, since the magnetic disk body is positioned with respect to the center of the rotation axis by only contacting the taper surface of the core bar of the magnetic disk body with the ring provided on the rotary table, the magnetic disk body of the present invention can be made magnetic. The number of parts of the disk body is small and the structure is simple. Further, since the truncated cone-shaped recess having the taper surface portion of the core of the magnetic disk body contacts the top surface of the disk receiving portion of the rotary table, the distance from the rotary table to the upper surface of the cartridge case is reduced. Therefore, it is possible to reduce the thickness and size of the disc mounting device.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view in which a main part of a disk mounting mechanism is shown in section, FIG. 2 is a front view of a rotary table provided with a ring in the disk mounting mechanism, and FIG. 3 (a) is a core bar of a magnetic disk body. FIG. 3B is a front view showing an enlarged cross-section of each main part of the magnetic disk body where the core metal is mounted on the rotary table, where FIG.

As shown in FIG. 1, a cartridge case 1
The magnetic disk body 2 is rotatably accommodated therein. The magnetic disk body 2 is composed of a donut-shaped magnetic disk 3 and a core bar 17. The core bar 17 is three-dimensionally pressed from a magnetic metal plate (for example, a magnetic stainless steel plate). The inside diameter of the rotary table 1
An upper wall 18 that is larger than the outer peripheral diameter of the top surface 16 of No. 1 and that is smaller than the outer diameter of the ring 24 having elasticity that is formed of a spring wire or the like provided on the rotary table 11 and is in contact with the locking portion 22. And a frusto-conical recess having a taper surface portion 19 which is connected to the upper wall 18 and spreads downward at an inclination angle θ2, and a flange portion 20 for adhesively fixing the inner peripheral portion of the magnetic disk 3 to each other.
Is integrally molded. The inclination angle θ2 is slightly larger than the inclination angle θ1 of the taper surface 21 of the turntable 11 (FIG. 3).
(B)).

The upper case 1a of the cartridge case 1 is formed at substantially the same height as the upper wall 18 of the cored bar 17, and the upper case 1a is formed thereover.
A hole 23 having a diameter slightly larger than the outer diameter of the upper wall 18 is formed in the center of the sleeve 1a so as to engage with the upper wall 18.
The hole 23 allows a pressing member (not shown) to pass through when the magnetic disk body 2 is mounted on the disk drive body, and at the same time, engages with the upper wall 18 to transport the disk cartridge. The magnetic disk body 2 is prevented from being excessively offset to one side, and the outer peripheral portion of the magnetic disk 3 is prevented from coming into contact with the inner surface of the cartridge case 1 and being damaged.

The disk drive 9 includes a spindle 10 and
A rotary base 11 having a circular groove 12 tightly fitted to the spindle 10 and a top surface 16 on which the magnetic disk body 2 is mounted, a taper surface 21 spreading downward in the outer periphery, and a locking portion 22, and the groove. A ring-shaped permanent magnet 13 installed inside 12
And a ring 24 provided on the taper surface 21 of the turntable 11.

Since the ring 24 has one end opened as shown in FIG. 2, it can be expanded and contracted in the radial direction, and the inner diameter in the free state is brought into contact with the engaging portion 22 shown by the solid line in FIG. It is formed to be smaller than the inner diameter in the state.
Therefore, for example, when the ring-shaped elastic body 24 is below the position where the ring-shaped elastic body 24 abuts on the locking portion 22 as shown by the chain double-dashed line in FIG. This force produces a component force that pushes up the ring 24 itself by the taper surface. At this time, the force due to the friction between the ring and the taper surface acts in the opposite direction, but the inclination angle θ1 of the taper surface is approximately tan θ1> μ with respect to the friction coefficient μ between the ring and the taper surface. If formed in a relationship, as a result, an upward force acts on the ring 24, and the ring 24 always returns to the position where it abuts the locking portion 22 regardless of the position on the taper surface.

3 (a) and 3 (b) show a process of mounting the magnetic disk cartridge having the above-mentioned structure on the disk drive. FIG. 3A shows a state in which the magnetic disk body 2 starts to contact the disk drive body 9. As described above, the core metal 17
The upper wall 18 is formed such that its inner diameter is larger than the outer diameter of the top surface 16 of the rotary table 11 and smaller than the outer diameter of the ring 24 provided on the rotary table 11, and the taper portion connected to the upper wall 18 is formed. Since the inclination angle θ2 of 19 is formed slightly larger than the taper surface 21 of the turntable 11, the taper portion 19 first contacts the ring 24 at the contact point x. At this time, the turntable 11
On the other hand, when the center of the core metal 17 is displaced, the taper portion 19
The cored bar 17 moves in parallel so that the ring 24 contacts the entire circumference.

From this state, a pressing member (not shown) is further added.
When the core metal 17 is pressed downward, the taper portion 19 and the taper surface 21 are formed in such a relationship that the inclination angles are θ2> θ1 as described above, so that the ring 24 is attached to the taper portion 1
While being pressed by 9, the taper surface 21 moves in parallel downward. At this time, the outer diameter of the ring 24 increases, so
The contact point x of the taper portion 19 with the ring 24 also moves below the taper portion 19. Eventually, as shown in FIG. 3B, the upper wall 18
Is mounted on the top surface 16 by the permanent magnet 13 to complete the disk mounting, but the metal bar 17 has the taper portion 19 of the ring 2.
4 and the contact y are in full contact with the magnetic disk body 2
Is positioned with respect to the turntable 11 such that the centers of rotation coincide with each other.

When the magnetic disk cartridge is detached, if the pressing by the cored bar 17 is released, the ring 24 returns to the contact position of the engaging portion 22 by its elasticity as described above. Further, as shown in FIG. 1, the truncated cone-shaped concave portion of the cored bar 17 having the taper surface portion 19 which is connected to the upper wall 18 and spreads downward is brought into contact with the top surface of the disk receiving portion of the rotary table 11. Since the core bar 17 is made of a thin plate material, the top surface 16 is the most distal end of the disk drive body 9 in the mounted state of the magnetic disk cartridge.
Since the upper wall 18 of the cored bar 17 which is suction-mounted on the cartridge 6 and the upper surface of the cartridge case 1 have substantially the same height, the cartridge case starts from the top surface 16 which is the most distal end portion of the disk drive 9. -The distance to the upper surface of the case 1 is about the thickness of the cored bar 17 or at most equal to or less than the thickness of the case. This makes it possible to make the disc mounting device thinner and smaller.

[0018]

As described above, according to the present invention, an upward taper surface is formed on the outer periphery of the rotary table which is rotationally driven, and the taper surface is movable up and down along the taper surface. Set up a ring,
A core surface of the magnetic disk body is formed with a taper surface at an abutting position on the ring, the inclination angle of which is slightly larger than that of the taper surface of the rotary table. Since the positioning is performed, a center core formed by outsert molding on a magnetic plate and a leaf spring that presses against the positioning surface as in the prior art are not necessary, and the structure is simple and the number of parts can be reduced.

Further, since there is no drive shaft projecting upward from the top surface of the rotary table, and the core metal adsorbed to the top surface of the rotary table and the upper surface of the cartridge case are at substantially the same height, the disk drive device It can be made thinner and smaller.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing a state where a magnetic disk cartridge is mounted on a recording / reproducing apparatus in an embodiment of a disk mounting apparatus of the present invention.

FIG. 2 is a front view showing a turntable and a ring in the same embodiment.

FIG. 3 (a) is an enlarged cross-sectional front view of a main portion showing a magnetic disk cartridge mounting start state in the same embodiment. FIG. 3 (b) shows a main portion showing a magnetic disk cartridge mounting completed state in the same embodiment. Front view with enlarged section

FIG. 4A is a partially enlarged cross-sectional view of a conventional magnetic disk cartridge. FIG. 4B is a partial plan view of a center core of a conventional magnetic disk cartridge.

[Explanation of symbols]

 1 Cartridge Case 2 Magnetic Disk Body 3 Magnetic Disk 9 Disk Drive Body 10 Spindle 11 Turntable 17 Core Bar 18 Upper Wall 19 Taper Part 20 Flange Part 22 Locking Part 24 Ring

Claims (1)

[Claims] 1. A disk receiving portion is formed on the top of a rotary table provided at the end of a spindle, and an upward taper surface is provided on the outer periphery of the rotary table, and the taper surface is vertically deformed by elastic deformation. At a position where the movable ring is engaged, and the cored bar portion of the magnetic disk body inserted into the rotary table comes into contact with the ring,
A disk mounting apparatus, wherein a taper surface having an inclination angle larger than that of the taper surface is formed.