JPS6297102A - Floppy disk drive device - Google Patents

Abstract

PURPOSE:To attain the recording and reproduction of the information equivalent to two tracks of a conventional device just on a single track, by having the step actions on the average and at the same time selecting and delivering the 1st and 2nd index signals to record and reproduce the information in a half cycle period of a magnetic recording medium from the generating time point of an output index signal. CONSTITUTION:The 1st index signal is selected together with the 2nd index signal having a 180 deg. phase shift from the 1st index signal. These two index signals are delivered through an index selecting circuit 20. A step signal control circuit 14 halves the step actions on the average in response to the step and direction signals given from outside and at the same time specifies an index selecting signal. Thus the step actions are reduced down to half and at the same time the index selecting signal is specified. This index selecting signal selects and delivers the 1st and 2nd index signals. Then the information is recorded or reproduced in a half cycle period of a floppy disk from the generating time point of the output index signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a floppy disk drive device that is inexpensive and compatible with conventional devices.

(Prior Art) In recent years, the storage capacity of floppy disks has increased, and the track density has become extremely high, for example, about 200 TPI. As the track density increases, head positional accuracy becomes increasingly critical.

(Problems to be Solved by the Invention) The above configuration requires the use of one part of the stepper with high mechanical precision, resulting in an expensive apparatus.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a floppy disk drive device which overcomes the drawbacks of the prior art, is inexpensive, has the same storage capacity as the prior art device, and is compatible.

(Means for solving and resolving problems) A floppy disk drive device according to the present invention.

This device records and reproduces information by rotating a floppy disk and setting concentric tracks at predetermined pitches, and corresponds to the rotation of the floppy disk. a second index signal generation circuit that generates a single pulse (second index signal) that is 180 degrees out of phase with the first index signal that generates the first index signal; and an index selection signal that generates the first index signal. an index selection circuit that selects and outputs a second index signal as an index signal, and a step signal control that reduces the step operation by half on average in response to an external step signal and direction signal, and specifies the index selection signal. A circuit is provided, which reduces the step operation by half on average based on the correspondence between the direction signal and the step signal, and identifies the index selection progress, selects and outputs the first and second index signals based on the index selection signal, and outputs the first and second index signals. This device is configured to record or reproduce information in a half-circle section of the floppy disk from the point at which the index signal is generated.

(for production) With the above configuration, recording and re-recording is conventionally possible on two tracks.

For example, the information on tracks 1 and 2, and the information on tracks 3 and 4, on track 1 and track 2.
will be recorded and played back. Therefore, even if the track density is 172, it is possible to construct a floppy disk drive device that can record and reproduce information similar to the conventional one.

(Example) An example of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 is a block diagram of a floppy disk drive device according to the present invention. In the figure, reference numeral 1 is composed of a photocoupler or the like placed opposite to both sides of the index window of the floppy disk. An index signal generation circuit 2 is a second index signal generation circuit to which the first index signal generated by the first index signal generation circuit 1 is applied and generates a single pulse (second index signal) with a phase shift of 180 degrees from the first index signal. 3 is a step signal input terminal into which a step signal is input; 4 is a direction input terminal which determines the step direction of the head; 5 is an inverter circuit; 6 is a delay circuit to which the step signal is input and output after a predetermined time delay; 7 is an inverting circuit into which a delayed step signal is input and whose output is inverted every time the step signal is input; 8 is a step signal inverted by the inverter circuit 5, the output of the inverting circuit 7, and a direction signal; 9 is an inverter circuit to which the output of the inversion answer 7 is input, 10 is an inverter circuit to which the direction signal is input, 11 is an inverter circuit 5, 9
．． 10, a NAND circuit in which the inverted step signal, the output of the inverting circuit 7, and the direction signal are inputted to respective input terminals; 12, a NAND circuit 8;
11 is an AND circuit whose output is input to each input terminal, and 13 is a step signal output terminal to which the output terminal of the AND circuit 12 is connected. Inverter circuit 5, delay circuit 6, inversion circuit 7, NAND circuit 8, inverter circuit 9. I
O, the NAND circuit 11 and the AND circuit 12 constitute a step signal control circuit 14. 15 is a NAND circuit into which the output of the inversion circuit 7 and the output of the first index signal generation circuit 1 are input; 16 is an inverter circuit that inverts the output of the inversion circuit 7; 17 is the inverter circuit 16 and the second index signal generation circuit 2 18 is an AND circuit to which the outputs of the NAND circuits 15 and 17 are input, and 19 is an index signal output terminal to which the output terminal of the AND circuit 18 is connected. The NAND circuit 15, the inverter circuit 16, the NAND circuit 17, and the AND circuit 18 constitute an index signal selection circuit 20.

FIG. 2 is a plan view of a floppy disk installed in a floppy disk drive device.

(The mechanical system of the drive device is not shown.) In the same figure,
21 is a floppy disk 222 is a jacket of the floppy disk 21, 23 is an index window, 24
is an index hole, and 25 is a head window.

When the floppy disk 21 rotates and the index hole 24 passes through the index window 23, the first
An index signal generation circuit 1 generates a first index signal. The second index signal generated by the second index signal generation circuit 2 is 1 higher than the first index signal.
80 degrees out of phase. The first index signal and the second index signal are each supplied to an index signal selection circuit 20, and the output of the inversion circuit 7 is
When HII, the first index signal is “L 11
In this case, the second index signal is applied to the index signal output terminal 19.

Note that the floppy disk 21 rotates at the conventional speed of 172 as described above, and the floppy disk drive measures the timing from the generation of this index signal to record and reproduce information. When the output is +i H1H, the floppy disk 21
When the output of the inverting circuit 7 is "L", recording and reproduction is performed on the right half.

FIG. 3 is a timing diagram showing the operation of the floppy disk drive device shown in FIG. 1.

In the figure, (a) is the direction signal applied to the direction signal terminal 4, (b) is the input step signal applied to the step signal input terminal 3, and (c) is the output signal of the delay circuit 6 (delayed step signal ), which is the input step signal (b) delayed by a predetermined time.

(d) is the output of the inversion circuit 7, which is inverted every time the delay step signal is applied. Note that the inverting circuit 7 is powered on.
The configuration is such that the output becomes "L" upon restoration. (e) is an output step signal appearing at the step signal output terminal 13. During the period when the direction signal is "HII", when the output of the inverting circuit 7 is "H+t", the input step signal is output, and the direction signal is "11".
During the period L II, the input step signal is output when the output of the inverting circuit 7 is "L".

That is, the step signal control circuit 14 reduces the output step signal by half on average based on the correspondence between the direction signal and the input step signal. This output step signal is
It is used together with the direction signal to step the head assembly, and is stepped to the track position (f).

The output of the inversion circuit 7 is also supplied as an index selection signal to the index selection circuit 20, and the index selection circuit 20 selects and outputs the index signal (g) in response to the output of the inversion circuit 7.

Then, information is recorded and reproduced on the floppy disk 21 for a half-cycle period from the point in time when the index signal output as described above is generated.

(Effects of the Invention) According to the present invention, the step operation is halved on average, and the first and second index signals are selectively output.
It is possible to provide a floppy disk drive device that records and reproduces information in a half-circle section of a magnetic recording medium from the time point at which an output index signal is generated. This floppy disk drive device can record and reproduce information on one track from two tracks of the conventional device, is inexpensive, is compatible with the conventional device, and has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a floppy disk drive device according to an embodiment of the present invention, FIG. 2 is a plan view of the floppy disk, and FIG. 3 is a timing chart showing the operation of the floppy disk drive device. 1.2... Index signal generation circuit. 3...Step signal input terminal, 4...Direction signal input terminal, 5.9.10.16...Inverter circuit, 6...Delay circuit, 7...Inverting circuit, 8, 11.15 .17... NAND circuit, 12
．． 18...AND circuit, 13...Step signal output terminal, 14...Step signal control circuit, 19...
- Index signal output terminal, 20... Index signal selection circuit, 21... Floppy disk,
22... Jacket, 23... Index wind, 24... Index hole, 25... Head wind, (a)... Direction signal, (b
)...Input step signal, (C)...Output of delay circuit, (d)...Output of inverting circuit, (e)...Output step signal, (f)...Track position, ( g
)...Index signal. Figure 2

Claims (1)

[Claims] A floppy disk, which is a magnetic recording medium, is driven to rotate, concentric tracks are set at predetermined pitches, and information is recorded and reproduced. a first index signal generation circuit that generates one pulse (first index signal); and a first index signal generation circuit that generates a single pulse (second index signal) that is 180 degrees out of phase with the first index signal. 2 index signal generation circuit, an index selection circuit that selects the first index signal and the second index signal according to the index selection signal and outputs it as an index signal, and a step operation in response to an external step signal and direction signal. a step signal control circuit that reduces the step operation by half on average and specifies the index selection signal, based on the correspondence between the direction signal and the step signal, specifies the index selection signal, and specifies the index selection signal. A floppy disk drive device characterized in that the first and second index signals are selectively outputted in response to a selection signal, and information is recorded or reproduced in a half-circumference section of the floppy disk from the time point at which the outputted index signal is generated.