JPS633020Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary disk device such as a floppy disk device, and in particular, the rotary disk has a rotary drive pin insertion hole in a core metal etc. attached to the center part of the rotary disk. The present invention relates to a rotary disk device in which a rotary drive pin on a motor side is inserted into a rotary disk, thereby simultaneously driving the rotary disk and determining a rotation reference angle position.

While rotating the disk-shaped rotating recording medium,
Among rotating disk devices that record and reproduce various types of information, rotating magnetic disk devices as peripheral devices for data storage of computers and some rotating disk devices for recording and reproducing image information use the above-mentioned rotating recording method. It is required to detect the rotational angular position of the media.

For example, in the case of a floppy disk device that is often used as a peripheral device for so-called microcomputers, an index hole is used to determine the reference position in the circumferential direction of a plurality of concentric recording tracks. is provided, and the arrangement of data formats in one track is determined or confirmed based on the index pulse obtained by detecting this index hole on the disk drive side. In this way, instead of directly detecting the rotational angular position of the rotating disk itself, it is also possible to set the rotational angular position of the rotating disk in a fixed relationship in advance to the rotational angular position of the motor rotation shaft on the disk drive device side. is,
For example, a rotational drive pin is provided at a position eccentric from the rotation axis of the motor, and a rotational drive pin insertion hole is formed on the rotary disk side corresponding to this rotational drive pin, and the pin is inserted into this pin insertion hole to rotate. By driving, the rotational angular position of the rotary disk can be detected from the rotational angular position of the motor. In this case, a so-called core metal, which is a circular metal plate formed into a dish shape, is attached to the center of a thin magnetic sheet such as a floppy disk, and the rotary drive pin insertion hole is formed in the core metal.

By the way, if such a rotation drive pin insertion hole is formed to have approximately the same dimensions and shape as the rotation drive pin, it becomes difficult to guide and insert the pin into the insertion hole, so the insertion hole is formed larger than the pin. There is. However, when a rotary disk having an insertion hole larger than the above-mentioned pin is attached to a rotary disk device, it is unclear to which position in the insertion hole of the pin the rotary drive pin will be guided. , accurate rotation angle position detection may not be possible.

The present invention has been made in view of the conventional situation, and is directed to a rotary disk device in which the rotary disk is rotationally driven and positioned in the rotational direction by a rotary drive pin provided eccentrically on the motor side. It is an object of the present invention to provide a rotary disk device capable of reliably and accurately positioning the rotary disk in the rotational direction when the rotary disk is mounted.

That is, the features of the rotating disk device according to the present invention include a disk-shaped recording medium in which a rotation center shaft insertion hole is formed at the rotation center position and a rotation drive pin insertion hole is formed at an eccentric position, and this disk-shaped recording medium. a motor having at least a rotational drive pin inserted into the rotational drive pin insertion hole for rotationally driving a recording medium; a pair of a recording or reproducing head and a head pad disposed facing each other with the disk-shaped recording medium interposed therebetween; a driving means for mechanically driving at least one of the head or the head pad so as to sandwich the disk-shaped recording medium between the pair of the head and the head pad; A circuit unit is provided for driving the driving means, and when the disc-shaped recording medium is mounted, the disc-shaped recording medium is sandwiched between the head and head pad pair and a rotational load is applied to the disc-shaped recording medium to drive the disc-shaped recording medium. The purpose is to position the pin at the rotation reference angular position of the rotation drive pin insertion hole.

Below, preferred embodiments of the present invention will be described.
This will be explained with reference to the drawings.

First, FIG. 1 is a perspective view showing the main parts of a rotary disk device 1. A flat brushless motor 4 is disposed in the center of a chassis 3 of a disk drive device 2. As shown in FIG. A rotary table 6 is integrally attached to the rotation center shaft 5 of this motor 4, and this rotary table 6
The rotary drive pin 7 is located eccentrically from the central axis.
However, magnets 8 are also provided around the central axis.

Further, a step motor 13 is attached to a vertical piece 12 provided on the chassis 3, and a motor shaft of the step motor 13 is connected to one end of a feed screw 15 by a connecting member 14. The other end of the feed screw 15 is rotatably supported by a vertical piece 16 of the chassis 3. Further, a guide shaft 17 is disposed on the chassis 3 in parallel with the feed screw 15, and a support base 18 is disposed along the guide shaft 17.
is guided and moved in the directions of arrows A and B in the figure. A magnetic head 20 is attached to this support base 18 via a head attachment plate 19, and a support member 22 for supporting a pad 21 is attached so as to be rotatable about a support shaft 23 in the directions of arrows C and D. . This support member 22 is always biased in the direction of arrow C by a tension coil spring 24, but when the cassette is not attached, it is placed in a position where the pad 21 is rotated in the direction away from the magnetic head 20 (in the direction of arrow D). The rotation in the directions of arrows C and D is controlled by a mechanical drive means such as a solenoid plunger, which is not shown in the figure.

Further, an engaging portion 28 is provided on the support base 18, and includes a female thread that engages with the male thread of the feed screw 15, or a needle-like member that engages with the valley between the threads. , the feed screw 15 , and the engaging portion 28 constitute a feed mechanism 29 . As the step motor 13 rotates step by step, a pair of magnetic heads 20 and pads 21, which are a pair of recording and reproducing elements, are intermittently moved in the direction of arrow A or B. .

Next, as a recording medium, a disk cassette 31 (also referred to as a disk pack) is used, which is made up of a disk-shaped magnetic sheet 32 housed in a flat cassette housing 33. This disk cassette 31
The cassette housing 33 is formed by bonding and synthesizing, for example, an upper half 33a and a lower half 33b made of synthetic resin, and a flexible disc-shaped magnetic disk (magnetic sheet) 32 is placed inside the cassette housing 33. is stored in a rotatable state. As shown in FIGS. 1 and 2, the upper half 33a and the lower half 33b are provided with pad insertion holes 34a and head insertion holes 34b, respectively, at vertically corresponding positions. A recess 35 for detecting incorrect insertion is provided at a position (a position other than the center). Further, a slide plate 3 having a U-shaped cross section that slides in the directions of arrows E and F along the front end surface 33c.
7 are disposed so as to cover the front upper and lower surfaces of the cassette housing 33, and this slide plate 37 has a first
As shown in the drawings and FIG. 2, elongated holes 38a and 38b are provided at positions corresponding to the insertion holes 34a and 34b, respectively, when moved in the direction of arrow E. On the other hand, as shown in FIGS. 2 and 3, a circular opening 39 is provided at the center of the magnetic disk 32, and when the protrusion 40a of the dish-shaped core metal 40 is fitted into the opening 39, opening 39
The peripheral edge of the metal core 40 is bonded to the flange 40b of the core bar 40 using adhesive, double-sided adhesive tape, or the like. Further, a motor shaft insertion hole 41 is provided at the center position of the bottom surface 40c of the core metal 40, and this insertion hole 4
A rotary drive pin insertion hole 42 is provided at a position eccentric from 1.

By the way, the rotational drive pin 7 of the flat brushless motor 4 is supported via a leaf spring 45, as shown in FIGS. It is now possible to move. That is, a substantially annular leaf spring 45 centered on the rotating shaft 5 is arranged so as to be in contact with the lower surface of the disc-shaped rotary table 6, and this leaf spring 45 has a substantially horseshoe shape with a part of the annular shape cut away. The rotating table 6 is screwed and fixed to the rotor of the motor 4, so-called a rotor 47, through a supporting table 46, and these rotating table 6, leaf spring 45, supporting table 46, and rotor 47 are screwed together.
rotates as a unit. The leaf spring 45 is formed with a support portion 45b having a hole 45a into which the protrusion 7a of the rotary drive pin 7 is inserted, and the support portion 45b is connected to the main portion of the leaf spring 45 through thin connecting bridge portions 45c and 45d, respectively. It has a shape connected to. Then, by fitting the fitting member 7b to the protrusion 7a with the protrusion 7a of the rotation drive pin 7 inserted into the hole 45a, the rotation drive pin 7 is attached and fixed to the support portion 45b of the leaf spring 45. I can do it. Further, the rotor 47 of the motor is formed with a radially long elongated hole 47a for guiding the fitting member 7b of the rotational drive pin 7. The drive pin 7 can swing in the directions of arrows G and H, which are radial directions, about the position supported by the leaf spring 45 as the center. Further, the rotation drive pin 7 is also movable in the axial direction, which is the downward direction in FIG.

Next, the operation when the disk cassette 31 is attached to the rotary disk device having such a configuration will be explained.

In this type of rotary disk device, the disk cassette 31 is normally held by a cassette holder or the like of a cassette loading device (not shown) and placed at a temporary loading position directly above the motor 4, as shown in FIG. For example, it is configured to move downward in parallel from the temporary attachment position to reach the regular attachment position. Generally, in the temporary mounting position, the motor shaft insertion hole 41 of the core bar 40 of the disk cassette 31 is
So-called centering is performed so that the motor 4 is disposed on an extension line of the rotation center shaft 5 of the motor 4, and the motor rotation center shaft 5 is smoothly inserted into the motor shaft insertion hole 41 as soon as it reaches the correct mounting position. The guide will be inserted.
On the other hand, regarding the rotation drive pin insertion hole 42 formed at an eccentric position of the core bar 40, it is extremely rare that the rotation drive pin insertion hole 42 is arranged at the same rotation angle position as the rotation drive pin 7 of the rotary table 6 of the motor 4. When the disk cassette 31 reaches the normal mounting position, as shown in FIG. 7, the rotary drive pin 7 is often pressed by the bottom surface 40c of the core bar 40 and is biased downward in the figure. When the rotary drive pin 7 reaches the rotary drive pin insertion hole 42 of the core metal 40 due to the rotation of the rotary table 6 of the motor 4, the rotary drive pin 7 is guided and inserted into the pin insertion hole 42.

Here, FIG. 9 is an enlarged plan view showing only the core bar 40 of the disk cassette 31 taken out and viewed from the top side. It is formed to have a larger size and shape than the outer shape of the rotation drive pin 7. Therefore, if the rotational drive pin 7 is simply guided and inserted into the pin insertion hole 42, an accurate rotational angular position cannot be determined. That is, the rotation drive pin 7 reaches the front edge 42 in the rotation direction in the rotation drive pin insertion hole 42.
For the first time, the magnetic disk 3
2 and the motor 4 (more precisely, the magnetic disk 32 and the rotary table 5 and the rotor 47) are aligned in the rotational direction. In this case, the reference position determination portion of the core bar 40 of the disk cassette 31 includes a V-shape formed by the two end sides 41a and 41b in the substantially square motor shaft insertion hole 41, and a substantially rectangular rotary drive pin insertion hole 42. The inner two end sides 42a, 4
2b is used, and by contacting the outer periphery of the motor rotation center shaft 5 and the outer periphery of the rotation drive pin 7 with these V shapes, the positioning of the magnetic disk 32 with respect to the motor 4, that is, center axis alignment, is achieved. Rotational alignment is performed accurately. Note that the two end sides 41a and 41b in the motor shaft insertion hole 41 are connected to the rotation drive pin insertion hole 42.
Also, the end side 42b inside the rotation drive pin insertion hole 42 is the side on the outer peripheral side far from the motor shaft insertion hole 41, and the end side 42a is the side on the front side in the motor rotation direction (arrow J direction). This is the side for determining the rotation reference angle position.

By the way, due to the rotation of the rotary table 6 of the motor, the rotation drive pin 7 is inserted into the rotation drive pin insertion hole 42 of the core bar 40.
In the state in which the rotary drive pin 7 is simply guided and inserted into the shaft, the rotary drive pin 7 is placed at a position Q shifted by Δθ from the reference angular position P, for example, as shown by the solid line in FIG. In this state, as shown in FIG. 8, the rotary drive pin 7 is given an elastic return force G directed toward the outer circumference in the radial direction by the leaf spring 45, and the magnet 8 of the rotary table 6 is attached to the bottom surface 40c of the core bar 40. By adsorbing the rotary drive pin 7, the core bar 40
The magnetic disk 3 remains locked at the above position Q.
2 rotational drive may be performed, which is not preferable.

Therefore, in the present invention, as shown in FIG. 10, the pad support member 22 is rotated in the direction of arrow C at the same time or immediately after the disk cassette 31 is installed, and the magnetic disk 32 is moved by the head 20 and the pad 21. Apply a rotational load by sandwiching the
The rotation drive pin 7 is forcibly moved to the reference position P within the pin insertion hole 42. That is, while the magnetic disk 32 attempts to stand still due to the frictional force between the head 20 and the pad 21, the rotation drive pin 7 on the motor rotating table 6 rotates in the direction of arrow J, resulting in the rotation shown in FIG. The drive pin 7 moves from the above position Q to the above reference position P and inserts into the pin insertion hole 4.
After accurate positioning, the magnetic disk 32 is rotated.

The clamping operation of the magnetic disk 32 between the head 20 and pad 21 for positioning is performed automatically in conjunction with the mounting operation of the disk cassette 31 using, for example, a circuit as shown in FIG. can be set. This 11th
In the circuit section shown in the figure, the disk cassette 31
A detection signal from the mounting detection means 51 that detects that the seat has reached the normal mounting position is sent to a timer means 52 using a monomulti or the like, and lasts for a certain period of time (about a fraction of a second to several seconds). The on-continuation signal is sent to the output circuit 53, and the output from the output circuit 53 drives, for example, a driving means 54 such as a solenoid plunger for rotating the pad support member 22 in the direction of arrow C. .

FIG. 12 shows a specific circuit example of the circuit section shown in FIG. 11. As the mounting detection means 51, a photoelectric detection device ( A phototransistor 61b of the photointerrupter 61 is used.
For example, the output from the mono multi circuit 62 as the timer means outputs a pulse with a pulse width of about 800 msec, and the mono multi circuit 6
The pulse output from transistors 63a and 6
3b, and the output of the output stage transistor 63b energizes and drives a solenoid coil 64 such as a solenoid plunger serving as the driving means 54.

Here, the time point at which the rotational drive of the motor 4 starts is when the rotating disk device is powered on (power-on), or when the disk cassette 31 is inserted into the cassette holder of the cassette loading device and temporarily loaded. good. Alternatively, the attachment detection means 51
The motor rotation drive is started by the output that detects the above-mentioned correct mounting, and with the magnetic disk 32 sandwiched between the head 20 and the pad 21, the state from the state shown in FIG. 7 to the state shown in FIG. The operation of guiding and inserting the rotary drive pin 7 into the pin insertion hole 42 and the reference positioning operation may be performed continuously.

As is clear from the above description, according to the rotary disk device of the present invention, when a disk-shaped recording medium such as a disk cassette is loaded, the recording medium is sandwiched between the head and the pad pair to reduce the rotational load. By providing this, the rotary drive pin is positioned at a reference position within the rotary drive pin insertion hole, and the disk-shaped recording medium can be rotationally driven with an accurate rotational phase.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, as the disk-shaped recording medium, optical or electrostatic recording media can be used in addition to magnetic recording media; Alternatively, the rotary disk itself may be made of a hard material and the rotary drive pin insertion hole may be directly formed therein. Further, it is preferable to provide a delay between the drive timing of the motor and the drive timing of the drive means 54 as necessary. This is because if the rotary drive pin 7 is pressed down with the pad 21 before it can enter the pin insertion hole 42, it will become more difficult to enter the pin insertion hole 42.

Therefore, for example, from the motor startup timing
Just trigger the mono multi 62 with a delay of 300 msec.

Although the embodiments have been described using discrete circuits, those skilled in the art can easily imagine implementing the embodiments of the present application by program control using a microcomputer.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a perspective view showing the main parts of a rotating disk device, Fig. 2 is a bottom view showing the back side of a disk cassette, and Fig. 3 shows a disk cassette attached to a rotating disk. 4 is an exploded perspective view showing an example of a specific structure near the rotation drive pin of the motor, and FIG. 5 is an exploded perspective view showing the assembled state of the rotation drive pin. FIG. 6 is a schematic perspective view for explaining the operation of installing the disk cassette, and FIGS. 7 and 8 are main parts for explaining the operation of the rotational drive pin when the disk cassette is installed. FIG. 9 is an enlarged plan view showing only the core metal of the disk cassette, and FIG. 10 is a schematic perspective view for explaining the clamping operation of the magnetic disk between the head and the pad when the disk cassette is installed. , FIG. 11 is a block diagram showing a circuit section used in the rotary disk device according to the present invention, and FIG. 12 is a circuit diagram showing a specific example of the configuration of the circuit section shown in FIG. 11. DESCRIPTION OF SYMBOLS 1...Rotating disk device, 2...Disk drive device, 4...Motor, 5...Rotation center shaft, 7...
Rotation drive pin, 20... Magnetic head, 21... Pad, 22... Pad support member, 31... Disk cassette, 32... Magnetic disk, 40... Core bar, 41... Rotation center shaft insertion hole, 42 ...Rotation drive pin insertion hole.

Claims (1)

[Claims for Utility Model Registration] A disk-shaped recording medium in which a rotational drive pin insertion hole is formed at least at a position eccentric from the center of rotation; a motor having a rotational drive pin to be inserted; a pair of recording/reproducing elements disposed opposite to each other with the disc-shaped recording medium interposed therebetween; and a pair of recording/reproducing elements so as to sandwich the disc-shaped recording medium. a driving means for driving at least one of the recording and reproducing elements; and a circuit unit that rotates the motor when the disc-shaped recording medium is mounted; A rotary disk device characterized in that the rotary drive pin is positioned at a rotation reference angular position of the rotary drive pin insertion hole by sandwiching the disk-shaped recording medium between the pairs and applying a rotational load.