JPS6352308A - Floppy disk drive device - Google Patents

Abstract

PURPOSE:To make mechanical movement of heads themselves unnecessary to shorten the data read time very much by providing a head group corresponding to each track of a floppy disk. CONSTITUTION:The signal on each track of the floppy disk is read by a head group 1 which is provided to correspond and contact with each track of the disk. Disk control signals 11 and 12 due to a logic from an interface are impressed to a control circuit 14 to output head selection control signals C1-Cn. Head selecting switches S1-Sn provided in input sides of comparators 4 are closed to make comparators 4 operated, thereby selecting comparators 4. Signals of heads compared with a reference potential are outputted from outputs of selected comparators 4. Consequently, an average access time required for read of the data signal is very shortened in comparison with a single head because it is unnecessary to move heads.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a floppy disk device that shortens the average head access time.

(b) Prior Art Conventionally, in a floppy disk drive device that accesses data on a disk using a floppy head, one head is used to read data, as shown in the diagram in Figure 4. I was trying to read data by moving from one track to another.

(c) Problems to be Solved by the Invention However, such a floppy disk drive device has a disadvantage in that it takes a long time on average to move the head and become ready to read data. Furthermore, since a stepping motor and drive mechanism are required to move the head, there are structural constraints due to the physical shape, making it difficult to miniaturize. Furthermore, moving the head consumes power, and when used in a portable type, there is a considerable burden on the power supply, and these limitations have some drawbacks.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a floppy disk drive device that eliminates the above-mentioned drawbacks, shortens the average access time of the head, and can be made smaller, lighter, and consume less power.

(d) Means for solving the problem This invention is provided so as to be in contact with a floppy disk,
In addition, there is a head group 1 consisting of first to nth heads arranged in a number corresponding to the number of tracks on the disk, a preamplifier 2 for amplifying a signal corresponding to each head, a differentiator 3 for differentiating a signal waveform, and a head group 1 for each head. It is selected by a selection control signal and connected to a comparator 4 that compares the reference potential and the output signal from the differentiator.

On the other hand, the 5TEP signal from the interface]] and the DI
A control signal output for selecting the head of the head group is obtained via the counter 8 and decoder 7, which perform head selection using logic based on the ECT10N signal 12.

This output causes the 8
1 to Sn head selection switches are operated, and a signal is output only from the comparator to which the output from the differentiator 3 is added, and a logic circuit 5 that performs a logical OR of this output and a disk control signal select the head. Floppy disk device (e) consisting of a control circuit for outputting a selection control signal Function: Signals from each track on the floppy disk are read by a group of heads provided in contact with each track on the floppy disk. At this time, if there is a disk control signal 2jl based on the logic from the interface, the disk control signal is applied to the control circuit, and a head selection control signal is output. Then, a head selection switch provided on the input side of the comparator is closed to put the comparator into operation, thereby selecting the comparator. The output of the selected comparator outputs the signal of the head compared with the reference potential. Therefore, since there is no need to move the head compared to when a single head is used, the average access time until reading the data signal can be extremely shortened.

(F) Embodiment One embodiment of this invention will be explained based on the block diagram in FIG. 1, the timing chart in FIG. 2 (input/output signals of control circuit 4), and the head arrangement diagram in FIG. 3. do.

In the protour diagram in Figure 1, the first to in-head heads of head group 1 are installed so as to be in contact with the floppy disk.
The number of fixed heads is equal to the number of tracks on the floppy disk, and the heads corresponding to each track are amplified by each preamplifier 2, and these data signals are differentiated by a differentiator 3 and then sent to a zero cross comparator. 4 is input.

These zero cross comparators each have switches 81 to S.
n is provided. 5 from the interface on the other hand
The TEP signal 11 and the DIRECTI○N signal 12 are input to the gate circuit 13 as the control circuit 14, the 5TEP signal is used as a count pulse, the DIRECTION signal is used as a count up or count down selection signal, and the count signal is output from the gate circuit 13. Output. The counter 8 performs a counting operation based on the count signal, and inputs its output to the decoder 7 to output a signal corresponding to the count signal. This output becomes a control signal C for the head selection switches 51 to Sn of the cello cross comparator 4 as a head switching signal. Control signal C of the switches 81 to Sn of the zero-cross comparator 4 described above
When there is no output, the (-) side input of the cello cross comparator will always be higher than the (+) side, and this output will be LOW L.
It becomes EVEL and no output is output.

In this embodiment, according to the head arrangement diagram in FIG. 3, head group 1's head 1-1 is located at the depth of track 0, so the control line of the decoder for head selection is controlled by the interface's 5TEP signal and DI day ECTl○N signal. A head selection control signal C1% is output to enable the zero-cross comparator 4 of the head 1-1. When the switch S1 of the cello-cross comparator 4 is closed, the head 1-1 starts the comparison operation of the cello-cross comparator 4, and the signal from the head 1-1 appears as an output.

After this output passes through a logic circuit 5, a pulse waveform shaping circuit 6 removes whiskers in the pulse waveform at the time of head switching, adjusts the waveform, and outputs the READ DATA 9, which is connected to the interface.

Next, when reading the data of track 1, the 5TEP signal and the DI date ECT in the timing chart of Figure 2.
Switch S2 is closed by the input of I○N signal, and head 1 is closed.
-2 signal is selected and the READ DA signal is selected as above.
It is output as TA9. When reading data on track 2, similarly, S3 is closed by the rising pulse of step signal 2, the corresponding head is selected, and the data on the track can be read.

(G) As described in detail, according to the present invention, compared to the conventional single head, there is a group of heads corresponding to each track of a floppy disk. Since the signal output of the head is electrically selected, there is no need to mechanically move the head itself. While maintaining compatibility with conventional floppy disk drive devices, the average access time until data is read is shortened, making data reading extremely fast. Therefore, since a special disk control signal for controlling the floppy disk drive device of the present invention is not required on the side of the system that utilizes it, restrictions on its use are eliminated. Furthermore, since the head does not move, there is no need for a stepping motor or a head positioning mechanism that used to move the head.

Therefore, the power consumption of the motor drive is eliminated, and the device can be made smaller and lighter. In addition, the structure is simple and can be constructed at low cost, making it easy to implement.

[Brief explanation of the drawing]

1 to 3 show an embodiment of a disk drive device according to the present invention. FIG. 1 is a block diagram, and FIG. 2 is a block diagram.
The figure is a timing chart (input/output signals of control circuit 14)
, FIG. 3 shows the layout of the head. The block diagram in FIG. 4 is a diagram of a conventional floppy disk drive device. 1-Fixed head group 8. Counter 2 Preamplifier 9・READ DATA3 Differentiator 10: ○ to TRAC Signal 4:
t'0'70s 11: 5TEP Signal D converter 12: DIRECTION signal 5 Logic circuit 13 Gate circuit 6 Pulse shaping circuit 1
4 Control circuit 7 Decoder Figure 1 Figure 2

Claims (1)

[Claims] The first to nth disks are provided so as to be in contact with the floppy disk, and are arranged in a number corresponding to the number of tracks on the disk.
a preamplifier that amplifies the data signal output corresponding to each head of this head group, a differentiator that differentiates the output signal of this preamplifier, and a disk control that outputs a head selection control signal from the disk control signal. The present invention is characterized by comprising a signal control means, a comparator selected by a head selection control signal and comparing a reference potential and an output signal from the differentiator, and a logical OR circuit that logically ORs each output of the comparator. floppy disk drive device