JPS63167471A - Device for discriminating magnetic disk - Google Patents

Abstract

PURPOSE:To easily and surely discriminate a various kinds of disks, by detecting a phase difference between the rotational reference phase of a rotary driving shaft and the rotational phase of a marker whose position is allocated corresponding to the kind of a magnetic disk. CONSTITUTION:In a non-recording area on the inner peripheral side of the magnetic disk 2, the marker 8 is formed at a position with an angle of rotation of theta allocated by every capacity for the setting position of the pin inserting hole 7 of a center core 1, and the detecting hole of the marker 8 is provided on the upper shell of a jacket, and a reflecting film 13 is a position confronting with the detecting hole of the lower shell. In such a way, the rotational reference phase of the rotor of a driving motor 20 detected by a rotation detector 31 is compared with the rotational phase of the marker detected by a photointerruptor 32 at a disk discrimination circuit 33, and the kind of the disk can be discriminated based on the phase difference.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk discriminating device for identifying differences in recording capacity of magnetic disks having a center core for regulating the mounting position with respect to a rotational drive shaft. It is commonly used in drive devices for microfloppy disks such as 3.5-inch microfloppy disks.

[Summary of the invention]

The present invention provides a non-recording area of a magnetic disk, such as a 3.5-inch micro-floppy disk, which has a center core for regulating the mounting position relative to the rotational drive shaft, in which the regulating position is assigned according to the type of the disk. By providing markers at rotational angular positions, the type of magnetic disk can be determined based on the phase difference between the rotational reference phase of the rotary drive shaft that rotates the magnetic disk and the rotational phase of the marker.

[Conventional technology]

Magnetic disks such as so-called floppy disks have traditionally been used as recording media for external information storage devices in various data terminal devices, minicomputers, microcomputers, etc., and with the development of magnetic media, high-density recording has been achieved. Even if they have the same shape, many types with different recording capacities are available.

For example, in the so-called 3.5-inch microflo and 7-bi disks, in addition to the so-called ZDD type with a recording capacity of IMByte and the so-called HD type with a recording capacity of 2MByte, those with a recording capacity of 4MByte and further 6MByte are available. I am trying to do.

Conventionally, the above 3.5 inch micro flow 1. The 2DD type and the HD type of a B-disk have been distinguished by the presence or absence of a hole for type identification provided in the jacket containing the disk, on the disk device side.

Here, 8-inch standard floppy disks, 5-inch mini-floppy disks, and 5-inch mini-floppy disks are mounted on the rotation drive shaft without any absolute positional restrictions in the direction of rotation. The disk drive detects the index hole provided to determine the starting point of the recording trunk.
A timing signal indicating the start point of the recording 1-rack is generated, and information is recorded and reproduced on a desired track. On the other hand, a 3.5-inch micro-floppy disk is mounted on the rotational drive shaft with the center core for regulating the mounting position in the rotational direction position EJllt 1rill. A timing signal indicating the start point of a recording track is generated from the rotational reference position signal of the shaft, and information is recorded and reproduced on a desired trunk.

[Problem that the invention seeks to solve]

By the way, as mentioned above, in a disk device that uses many types of floppy disks with different recording capacities as recording media, in order to perform operation control such as rotating the disk at a disk rotation speed depending on the type of disk, It is necessary to determine the type of disk installed. However, if a type identification hole is provided in the disk jacket to identify the type of disk, if there are many types of small floppy disks such as 3.5-inch microfloppy disks, It becomes difficult to secure installation space for the type identification hole mentioned above, and
There is a problem in that the type identification hole detection means on the disk drive side also becomes complicated.

Therefore, in view of the above-mentioned problems, the present invention provides a method for controlling operation according to the type of disk in a disk device that uses a small floppy disk such as a 3.5-inch microfloppy disk as a recording medium. The present invention aims to provide a magnetic disk discriminating device with a novel configuration that can reliably discriminate the types of a large number of installed disks.

[Means for solving problems]

In order to solve the conventional problems as described above, the present invention has the following features:
Markers are provided in the non-recording area of a magnetic disk having a center core for regulating the mounting position with respect to the rotational drive shaft at rotational angle positions assigned according to the type of disk with respect to the regulation position, and the rotational drive on which the magnetic disk is mounted is provided. The present invention is characterized in that the type of magnetic disk is determined by detecting the phase difference between the rotational reference phase of the shaft and the rotational phase of the marker.

[Effect]

In the magnetic disk discriminating device according to the present invention, a center core is provided in a non-recording area of a magnetic disk having a center core for regulating a mounting position relative to a rotational drive shaft at a rotational angle position assigned according to the type of disk with respect to the regulating position. The type of magnetic disk is determined by detecting the phase difference between the rotational phase of the marker and the reference rotational phase of the rotary drive shaft.

〔Example〕

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

The embodiment shown in FIGS. 1 to 4 uses a 3.5-inch micro-floppy disk 10 as a recording medium, in which a magnetic disk 2 having a metal center core 1 is housed in a jacket 3 made of synthetic resin. This is commonly used in magnetic disk drives.

In this embodiment, the 3.5-inch micro-floppy disk 10 is arranged inside a jacket 3 formed by butt-joining upper and lower shells 4 and 5 molded from synthetic resin, as shown in FIGS. 2 and 3. A magnetic disk 2 having a metal center core 1 is rotatably housed therein. A center core 1 made of gold (N) fixed to the center of the magnetic disk 2 has a center hole 6 and a pin insertion hole 7 formed at the center and at a position offset from the center.

In addition, in the non-recording area on the inner circumferential side of the magnetic disk 2,
A marker 8 is formed at a rotation angle position θ with respect to the installation position of the bottle insertion hole 7. Here, the above marker 8
The rotational angle (θ) position at which the rotational angle (θ) is provided is assigned according to the storage capacity of the magnetic disk 2. The upper and lower shells 4.5 constituting the jacket 3 that accommodates the magnetic disk 2 are provided with head insertion holes 8, 9 so as to expose the effective recording area on the radius of the magnetic disk 2. Furthermore, a marker detection hole 11 is formed in the upper shell 4 on the path Ut of the marker 8 as the magnetic disk 2 rotates. In addition, the lower shell 5 has a disc table insertion hole 12 formed at its center position with a diameter slightly larger than that of the center core 1, and a disc table insertion hole 12 with a diameter slightly larger than that of the center core 1. A membrane 13 is provided. Then, the magnetic disk 2 is subjected to disk protection sorting 14.15 with its center core 1 loosely fitted into the disk table insertion hole 12.
It is also housed in the jacket 3. A shutter 16 is slidably attached to the jacket 3 to open and close the head insertion hole 8.9.

As shown in FIGS. 1 and 4, the disk device to which the 3.5-inch micro-floppy disk 10 is mounted is a central portion of a rotor 21 of a disk drive motor 20 that rotates the magnetic disk 2. A disk table 22 made of a permanent magnet is provided. The desk table 22 has a rotary drive shaft 23 inserted into the center hole 5 of the center core 1 of the magnetic disk 2 and a drive pin 24 inserted into the bottle insertion hole 7 protrudingly provided.

Further, the disk drive device of this embodiment includes a rotation detector 31 for detecting the rotational phase of the rotor 21 of the disk drive motor 20, and a reflector for detecting the rotational phase of the marker 7 provided on the magnetic disk 2. A photo ink converter 32 is provided, and each detection output from the rotation detector 31 and the photo ink converter 32 is supplied to the disk discrimination circuit 32. Here, the above 3.5 inch microfloppy disk IO is
The center core 1 is locked to the rotational drive shaft 23 and the drive pin 24, so that it is mounted on the disk table 22 with absolute positional regulation in the rotational direction.

The rotation detector 31 detects one rotation of the rotor 21 for each rotation of the rotor 21 of the disk drive motor 20.
The rotational phase of the disc is detected, and the detected output is supplied to the disk discrimination circuit 32 as a rotational reference phase signal. Further, the reflective photo ink printer 32 has the jacket 3
Detection light is irradiated onto the magnetic disk 2 in the jacket 3 through the marker detection hole 11 provided in the upper shell 4, and through the marker 7 provided in the non-recording area of the magnetic disk 2.
By detecting the reflected light from the reflective film 13 disposed on the lower shell 5 of the jacket 3, one detection output is used as a marker phase signal each time the marker 7 passes through the marker detection hole 11 portion on the disc. It is supplied to the discrimination circuit 32. Then, the disk discrimination circuit 32 compares the phases of the rotation reference phase signal supplied from the rotation detector 30 and the marker phase signal supplied from the photo ink clubter 32, and uses the phase difference to detect the magnetic field. disc 2
The type of 3, that is, the storage capacity of the installed
A disk discrimination output signal indicating the type of 5-inch microfloppy disk 10 is output from the output terminal 33.

In an embodiment with such a configuration, the disk device side detects the rotational phase of the marker 7 formed at the rotational angle (θ) position assigned to each storage capacity in the non-recording area of the magnetic disk 2, and the magnetic disk 2 is The type of the mounted magnetic disk 2 can be easily determined by comparing it with the rotation reference phase of the rotary drive shaft 23 to be rotated, and the type of the disk can be determined based on the disk discrimination signal output from the output terminal 33. It is possible to perform control operations according to the

Further, by assigning the rotational angle (θ) position, that is, the installation position, of the marker 7 formed in the non-recording area of the magnetic disk 2 to each storage capacity, it becomes possible to easily discriminate between various types of disks.

〔Effect of the invention〕

As is clear from the description of the embodiments described above, in the magnetic disk discrimination device according to the present invention, the magnetic disk has a center core for regulating the mounting position relative to the rotational drive shaft. The type of magnetic disk is determined by detecting the phase difference between the rotational phase of a marker provided at a rotational angle position assigned according to the type and the reference rotational phase of the rotational drive shaft. Even in the case of a small floppy disk such as a floppy disk, various types of disks can be easily and reliably discriminated.

[Brief explanation of the drawing]

1 to 4 are drawings showing an embodiment in which the present invention is applied to a 3.5-inch microfloppy disk device, and FIG. 1 is a configuration diagram of the main parts of the disk device of this embodiment, FIG. 2 is an exploded perspective view of the floppy disk, FIG. 3 is a bottom view of the floppy disk, and FIG. 4 is a sectional view of essential parts of the floppy disk mounted on a disk table. 1... Center core 2... Magnetic disk 3... Jacket 8... Marker 10... Floppy disk 11... Marker detection hole 13... Reflective film 20...
Disk drive motor 21...Rotor 22...Disc table 23.
... Rotation drive shaft 24 ... Drive pin 31 ... Rotation detector 32 ... Photo ink club 33 ... Disc discrimination circuit

Claims (1)

[Scope of Claims] A marker is provided in a non-recording area of a magnetic disk having a center core for regulating the mounting position with respect to the rotational drive shaft at a rotational angle position assigned according to the type of disk with respect to the regulating position, 1. A magnetic disk discriminating device characterized in that the type of magnetic disk is discriminated by detecting a phase difference between a rotation reference phase of a rotary drive shaft that rotates the marker and a rotation phase of the marker.