JPH022068Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a motor for driving a floppy disk.

For example, in the case of a 3.5 inch floppy disk,
A unique feature is the chuck mechanism used when installing this into a floppy disk drive device.

That is, as shown in FIGS. 1 and 2, a rectangular spindle hole 6 is formed in the center of a centering metal 4 formed at the center of the floppy disk 2, and a spindle 8 integral with the rotation axis of the motor is formed in the center of the centering metal 4. Attach through. On the other hand, a substantially rectangular positioning hole 10 is formed in the centering metal 4 at a position slightly apart from the spindle hole in the radial direction, and a rotation stopper roller 12 is engaged with this positioning hole 10. The rotation stopper roller 12 has its base end integrally formed with a leaf spring 14, and is biased radially outward by the elasticity of the spring, so that the spindle 8 is located at the corner of the spindle hole 6. This results in stable contact, and the floppy disc can be attached without shifting its position.

Therefore, it is possible to eliminate the problem of positional deviation at the time of tracking head, which is the biggest obstacle in increasing track density.

By the way, conventionally, the floppy disk drive motor with the above structure has a structure in which various functional parts are simply stacked in the direction of the spindle, and as a result, the thickness becomes large and the size of the device is reduced. The result is that it does not meet the demand for

For example, in FIG.
It is integrally fixed to the spindle 8 by.
The drive magnet 16 is set to face a drive coil 24 attached to the stator yoke 22. A chucking head 28 on which the centering metal 4 is placed is mounted on the spindle 8 above the bearing portion 26, and a leaf spring 14 is mounted on the bottom surface of the chucking head 28.

In this configuration, the rotor case 18, the bearing section 26, the chuck head 28, and the leaf spring 14 are
The working areas, etc. occupy their respective spaces, and the total dimension value of these approximately determines the thickness of the device, increasing the thickness dimension in the spindle direction.

The present invention was made by focusing on the structural features of the floppy disk drive motor according to the above-mentioned prior art, and it eliminates the simple laminated structure of various functional parts and changes the laminated order to improve the device. The object of the present invention is to provide a floppy disk drive motor that is thin.

In order to achieve the above object, the present invention includes an annular drive magnet that is rotationally driven by a magnetic force from a stator, installed inside the outer circumferential side of the rotor case,
A chucking head for mounting and rotating a floppy disk is provided on the outer surface of the inner circumferential side of the rotor case, and a base end of a leaf spring is attached to the inner surface of the rotor case with a screw. a support pin that is attached to the chucking head through the plate spring, and has a swingable support plate integrally provided with the leaf spring, and a rotation stopper that engages with the floppy disk attached to the support plate. is fixedly fixed thereto, and the rotation stopper is swingably provided in a through hole formed in the chucking head.

The configuration of the present invention will be described below based on one embodiment.

FIG. 3 shows a cross section of the floppy disk drive motor according to the present invention, and FIG. 4 shows a cross section taken along line AA in the same figure.

In the figure, reference numeral 220 indicates a stator yoke, on the surface of which an insulating layer is formed, and various control and drive circuits are formed thereon. Drive coil 2
40 is one of them, and a plurality of drive coils such as another drive coil 240' are arranged concentrically. A stator is constituted by the stator yoke and the plurality of drive coils. On the stator yoke 220, a spindle 8 is located at a position corresponding to the center of the arrangement position of the plurality of drive coils 240, 240', etc.
A bearing 260 that rotatably supports 0 is fitted. Further, the bottom opening of this bearing 260 is closed by a thrust receiving plate 300, and supports the lower end of the spindle 80.

Next, a chucking head 280 is fitted and fixed to the tip side of the spindle 80.

On the bottom surface of this tracking head 280, there are 2
An ashtray-shaped rotor case 180 having a stepped diameter is
The ashtray is attached using screws 302 and screws 303 and 303', which will be described later, in a position similar to when the ashtray is turned upside down.

An annular drive magnet 160 is adhesively fixed to a large-diameter stepped surface corresponding to the outer circumferential side of the rotor case 180, and drive coils 240, 2
40', etc., and are disposed close to and facing each other.

Furthermore, a generator magnet 306 is adhesively fixed to a flange 304 formed on the outermost periphery of the rotor case 180, and is connected to a generator coil 308 formed at the same time as the circuit pattern formed on the stator yoke 220. It has a face-to-face configuration.

Now, when viewed from the rotor case 180 side, the tracking head 280 is attached to the outer surface of the rotor case corresponding to the back surface of the small-diameter stepped surface corresponding to the inner peripheral side of the rotor case. This is significantly different from the configuration of the prior art shown in FIG.

That is, the bearing 260 is installed inside the rotor case 180 using the inner space, thereby absorbing the space for the bearing, and furthermore, the rotor case 180
By providing the tracking head 280 in close contact with the spindle, the distance in the spindle direction is shortened as much as possible.

A part of the chucking head 280 has a through hole 312 for accommodating the rotation stopper 120 so as to be able to swing freely.
is formed. This rotation stopper 120 is fixed to the tip of a support pin 314, and the base end of this support pin 314 is attached to a support plate portion 316a of a buffer leaf spring 316 provided inside the protrusion portion 310.
It is fixed by caulking or other means.

This leaf spring 316 has its base end attached to the tracking head 280 via the rotor case 180 with the screws 303 and 304, together with a substantially T-shaped contact plate 318.

The leaf spring 316 has two connecting pieces 3 from its base end.
The protruding tips 16b and 316c are branched and extended, and the protruding tips that are the merging portions are bent into an L shape and are supported by being brought into contact with the tongue piece 18a cut and raised from the rotor case 180. A swingable plate extending from the protruding tip between the two connecting pieces 316b and 316c corresponds to the support plate 316a.

On the other hand, the abutment plate 318 has a protruding end bent in an L-shape, and a stepped portion 318a thereof is located below the free end of the support plate portion 316a. Rotation stop 1 due to
It functions as a stopper that restricts the swinging of the support plate portion 316a that swings in response to the swinging of the support plate 20.

In the device of the floppy disk 2, the spindle hole 6 engages with the spindle 80, and the rotation stopper 120 engages with the positioning hole 10. Further, the case of the floppy disk is positioned by a pointing positioning pin 322 installed in the stator yoke 220 with a flat screw 320.

There are two other pointing positioning pins in addition to the one indicated by reference numeral 322, but they are not shown in the figure.

Further, in the figure, reference numeral 324 indicates a control integrated circuit.

Next, another embodiment of the present invention will be described with reference to FIGS. 5 and 6.

This embodiment differs from the previous embodiment in that the support plate 318 in the previous embodiment is omitted and the leaf spring 3
16 is replaced by a doughnut-shaped leaf spring 3160, and the other configurations are the same as in the previous embodiment.

A mounting portion 3160a that protrudes into a rectangular shape is formed at the base end of the leaf spring 3160, and the mounting portion 3160a is attached to the rotor case 1 with a screw 3020.
800 to the tracking head 2800.

The other component configurations and functions are similar to those in the embodiment described above, so only the names will be listed.

800 is a spindle, 2400 is a drive coil, 1600 is a drive magnet, 1
200 is a rotation stopper, 3140 is a support pin, 2600 is a bearing, 3000 is a thrust receiving plate, 2200 is a stator yoke, 306
0 indicates a generator magnet, and numeral 3080 indicates a generator coil.

Further, reference numerals 3400 and 3600 each indicate a tracking head 2800 for the rotor case 1800.
The mounting screw holes are shown.

Note that in each of the above embodiments, the rotor case 18
0 and rotor case 1800 respectively.
0.3100 are formed, but depending on the case, an example may be considered in which these are not formed and the outer surface of the rotor case is made flat. In that case, the configuration is such that the leaf spring and bearing are accommodated within the inner diameter space of the drive magnet.

As explained above, in the present invention, the inner diameter space of the drive magnet provided inside the rotor case is used, and the bearing and the leaf spring are housed in the recessed part. Due to the close arrangement, the thickness dimension in the spindle direction can be greatly shortened, and the device can be made thinner.

Furthermore, by attaching the tracking head directly to the rotor case, the rotation is integrated with the rotor case, thereby suppressing the run-out phenomenon. Therefore, compared to the prior art configuration in which the rotor case and the tracking head are fixed to both ends of the spindle, it is easier to rotate the tracking head with higher precision.

Further, the leaf spring mounting screw is screwed into the chucking head through the rotor case, so that the tightening means can be shared and the number of parts can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a partial plan view of the centering metal part of a floppy disk installed in a floppy disk drive device, Fig. 2 is a sectional view of a conventional floppy disk drive motor, and Fig. 3 is a main FIG. 4 is a cross-sectional view taken along the line A-A in the above figure, and FIG. 5 is a cross-sectional view of a floppy disk drive motor according to another embodiment of the present invention. , FIG. 6 is an exploded perspective view of the main parts of the same figure. 220, 2200...Stator yoke, 24
0,2400...Drive coil, 280,2800
...Chatting head, 180, 1800...
Rotor case, 160, 1600... Drive magnet, 120, 1200... Rotation stopper, 303,
303', 3020...screws.

Claims (1)

[Scope of utility model registration request] An annular drive magnet 160 that is rotationally driven by the magnetic force from the stators 220 and 240 is installed inside the outer circumferential side of the rotor case 180, and the floppy disk 2 is mounted on the outer surface of the inner circumferential side of the rotor case 180. A chucking head 280 is provided to place and rotate the rotor case 18.
The base end of the leaf spring 316 is attached to the inner surface of the screw 302.
It is attached to the chucking head 280 via the rotor case 180, and the plate spring 316 is integrally provided with a swingable support plate portion 316a. The support pin 314 equipped with the engaging rotation stopper 120 is fixed, and the rotation stopper 1
A floppy disk drive motor characterized in that a floppy disk drive motor 20 is swingably provided in a through hole 312 formed in the above-mentioned chucking head 280.