JPH0438065B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a floppy disk drive device.

[Technical background of the invention and its problems]

A floppy disk drive device is equipped with a spindle that is rotated by a motor, and the inserted floppy disk is held and rotated by the spindle, and a pulse motor is used to move a magnetic head in the radial direction of the floppy disk to write information on the floppy disk. Reading is in progress. Such a floppy disk drive device is connected to a host computer to control the rotation of the spindle motor and pulse motor, and to control the writing and reading of information.

Conventionally, in a floppy disk drive device, when the magnetic head is at a position other than the track zero position and the power is turned on to start, the magnetic head continues to move in the opposite direction to the track zero position, and the final state is reached. It is known that the track zero position is searched again after an error occurs, and information is written to or read from a predetermined track position based on the zero position.

However, such a device has the disadvantage that it takes time to detect the track zero position.

[Purpose of the invention]

This invention was made to eliminate these drawbacks, and the magnetic head can be moved in the direction to detect the track zero position immediately after the power is turned on and the track zero position is detected, and the track zero position can be detected in a short time. The purpose of the present invention is to provide a floppy disk drive device.

[Summary of the invention]

This invention writes information to each track by bringing a magnetic head into contact with a rotating floppy disk and moving the magnetic head in the radial direction of the floppy disk using a pulse motor.
In a floppy disk drive device that performs reading, when a track zero position detector that detects when the magnetic head reaches the track zero position at the start does not detect the track zero position, the magnetic head is moved in the direction of track zero and in the opposite direction. A pulse motor drive signal is output to move the magnetic head in the direction of track zero regardless of the signal, and after the position detector detects the track zero position, the pulse motor is output in response to a signal to move the magnetic head in the direction of track zero and in the opposite direction. It outputs a drive signal.

[Embodiments of the invention]

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

As shown in FIGS. 1 and 2, a floppy disk 3 is held by a spindle 2 which is rotationally driven by a motor 1. The floppy disk 3 is provided with a long hole 5 along its radial direction for bringing the magnetic head 4 into contact with the disk medium 3a. Note that 6 is an index hole for taking out an index signal. The magnetic head 4 is provided at the tip of a carrier 8 that moves along two parallel shafts 7a and 7b, and is movable in the radial direction of the floppy disk 3. Further, on the opposite side of the magnetic head 4, a holding body 9 for the disk medium 3a is provided so as to be movable up and down and placed on the carrier 8. As shown in FIG. 3, a light shielding plate 10 is provided protruding from one side of the carrier 8, and the light shielding plate 10 is provided when the magnetic head 4 is located at the zero track position (located at the outermost periphery) of the disk medium 3a. Light emitting diode 1 forming track zero position detector 11 with plate 10
It is set so as to shield light between the phototransistor 1a and the phototransistor 11b. The carrier 8 is controlled to move over the shafts 7a and 7b by a pulse motor 12 via a belt or the like.

FIG. 4 is a block diagram showing the main circuit configuration, and this circuit is composed of a microcomputer.

13 is a microprocessor, and a ROM is connected to this microprocessor 13 via a bus line 14.
(read-only memory), RAM (random
access memory) 16, IN port 17 and
The OUT ports 18 are connected respectively. Said
The RAM 16 includes a track zero detection flip-flop STOUT, a drive signal φA for the pulse motor 12,
φB, φC, φD setting area PM (A, B, C,
D) A direction flag DIRF is formed. The IN port 17 has an index signal.
IN, drive select signal DS, step signal
STP, direction signal as direction signal
DIR, sensor zero signal SZS, etc. are input.
The OUT port 18 has a track zero signal TZS,
Drive signals of pulse motor 12 φA, φB, φC, φD
etc. is output. The microprocessor 13 executes the program based on the program data in the ROM 15.
RAM16, IN port 17 and OUT port 18
The main processing shown in FIG. 5 is performed. That is, when the power is turned on and a start is started, first the RAM 16 is cleared and the OUT port 18 is reset. Then RAM
A=1, B=0, C= in 16 setting areas PM
0, D=1, and drive signals φA, D=1 are set from the OUT port 18 based on the contents of the setting area PM.
Outputs φB, φC, and φD. Then, the track zero detection flip-flop STOUT is set to "1". Next, it is checked whether the sensor zero signal SZS from the track zero position detector 11 is input to the IN port 17. If the sensor zero signal SZS is input, it is then checked whether the setting area PM is set to A=1, B=0, C=0, and D=1. If YES, the track zero detection flip-flop STOUT is set to “0”.
The track zero signal TZS is output from the OUT port 18. Also sensor zero signal SZS
If there is no, even if there is, the setting area PM is A = 1,
Track zero signal if D=1 is not set.
TZS output is not performed. Subsequently, the index signal is checked, the motor signal is checked, the step signal is checked, and the write signal is checked in sequence.

The step signal check process begins with the step signal from the IN port 17 as shown in FIG.
Checks whether there is an STP input, and if there is no input, exits from this process. If there is an input, the direction signal DIR is taken in from the IN port 17 and set in the direction flag DIRF. Next, it is checked whether the track zero detection flip-flop STOUT is set to "1", and if it is set to "1", DIRF is set to "0".
Next, check whether the direction flag DIRF is set to "1", and if DIRF = 0, shift the contents of the setting area PM to the left and set OUT.
Drive signals φA, φB, φC, and φD are output from port 18. Also, if DIRF=1, the setting area PM
The contents of are shifted to the right and drive signals φA, φB, φC, and φD are output from the OUT port 18. Next, check whether there is input of sensor zero signal SZS from IN port 17, and if there is no input, exit this process,
If there is an input, the setting area PM will be A=1, D
Check whether it is equal to 1. A=1, D=
If it is not 1, exit this process and set A=1.
If D=1, STOUT is reset to "0", a track zero signal TZS is output from the OUT port 18, and this process is exited.

In the embodiment of the present invention configured as described above, if the magnetic head 4 is deviated from the zero position of the track at the time of starting when the power is turned on, the sensor zero signal is output.
Since there is no SZS input, the track zero detection flip-flop STOUT is set to "1". However, in this lever state, even if a signal of "1" is input as the direction signal DIR, that is, a signal that moves the carrier 8 inward (the direction opposite to the track zero position), the direction flag DIRF is
is set to "0". Therefore, regardless of whether "1" or "0" is input as the direction signal DIR, the direction flag DIRF will always be set to "0", so the setting area
The contents of PM are always shifted to the left, and drive signals φA, φB, φC, and φD are output from the OUT port 18, and the pulse motor 12 rotationally controls the carrier 8 to move it outward, that is, in the direction of the track zero position. When the light shielding plate 10 of the carrier 8 reaches a position where it blocks the optical path from the light emitting diode 11a to the phototransistor 11b in the track zero position detector 11, the sensor zero signal SZS is output.
is input, so in this state PM is A=1, B=
0, C=0, and D=1, STOUT is reset to "0" and a track zero signal TZS is output.

In this way, when the magnetic head 4 deviates from the track zero position at the start, the direction flag DIRF is always "0" regardless of whether "1" or "0" is input as the direction signal DIR.
With this setting, the carrier 8 can be moved outward and the magnetic head 4 can immediately reach the track zero position, and the track zero position can be detected in a short time.

Once the track zero position is detected, the track zero detection flip-flop STOUT is reset to "0", so the setting area PM is set to the right depending on whether the direction signal DIR is "1" or "0". As a result, the carrier 8 is controlled to move inward and outward of the floppy disk 3.

The above has described this invention realized in software using a microcomputer.
It can also be configured in hardware using logic circuits.

Other embodiments of the invention will be described below with reference to the drawings. Note that the same parts as in the above embodiment are given the same reference numerals, and detailed explanations will be omitted.

As shown in FIG. 7, a light emitting diode 11a is connected between the +V terminal and ground through a resistor 21, and a phototransistor 11b is connected through a resistor 22. The collector output of the phototransistor 11b is inputted via a buffer amplifier 23 to one input terminal of a three-input type NAND gate 24. A track zero detection flip-flop 25 and a D-type flip-flop 26, 27 are provided.
7 is reset by an initial reset circuit 28 when the power is turned on. The flip-flop 25 is set by the low level track zero signal TZS output from the NAND gate 24. The direction D-type flip-flop 29 is reset by the reset output from the set output terminal of the flip-flop 25. Each of the D-type flip-flops 26, 27,
A step signal STP is inputted to each T terminal of 29 via a buffer amplifier 30. A direction signal DIR is inputted to the D terminal of the D-type flip-flop 29 for direction, and the output of the Q terminal of the flip-flop 29 is inputted to one input terminal of exclusive OR gates 31 and 32, respectively. The Q terminal output of the D-type flip-flop 27 is input to the other input terminal of the exclusive OR gate 31, and the Q terminal output of the D-type flip-flop 27 is input to the other input terminal of the exclusive OR gate 32.
terminal output is input. The output of the exclusive OR gate 31 is connected to the D-type flip-flop 2.
6 to the D terminal of the exclusive OR gate 32.
The output of the D-type flip-flop 27 is inputted to the D terminal of the D-type flip-flop 27. The D-type flip-flop 27
The Q terminal output of the Q terminal is outputted as a φC signal, and the terminal output is outputted as a φA signal and is inputted to the other input terminal of the NAND gate 24. The Q terminal output of the D-type flip-flop 26 is outputted as a φB signal, and the terminal output is outputted as a φD signal and is input to the remaining one input terminal of the NAND gate 24.

In this configuration, the phototransistor 11b is turned on when the magnetic head 4 is not at the track zero position at the start, so the track zero detection flip-flop 25 maintains its initial reset state. Since the D-type flip-flop 29 for direction also maintains the reset state,
Regardless of whether a signal of "1" or "0" is input as the direction signal DIR, the Q terminal output of the flip-flop 29 is always at a low level. That is, this is equivalent to inputting a signal of "0" as the direction signal DIR, that is, a signal in the direction of moving the magnetic head 4 to the track zero position. However, the step signal
Each time STP is input, the D-type flip-flop 2
6 and 27 are operated, and drive signals .phi.A, .phi.B, .phi.C and .phi.D for driving the pulse motor 12 to move the magnetic head 4 to the track zero position are output. When the magnetic head 4 reaches the track zero position and the optical path to the phototransistor 11b is blocked by the light shielding plate 10, the collector output of the phototransistor 11b becomes high level. In this state, the track zero signal TZS is output from the NAND gate 24 at the timing when the flip-flops 26 and 27 are reset, that is, the timing when φA and φD=1, and the track zero detection flip-flop 25 is set. This results in a D-type flip-flop 29 for direction.
The reset state of is released, and from then on, the D-type flip-flop 29 changes the direction signal DIR to "1",
Setting and resetting operations are performed by setting it to "0". However, from then on, the direction signal DIR
Depending on the state, the drive signals φA, φB, φC, and φD change to move the magnetic head 4 inward or outward, and the rotation of the pulse motor 12 is controlled.

In this way, this embodiment also provides the same effects as those of the previous embodiment.

〔Effect of the invention〕

As detailed above, according to the present invention, the magnetic head can be moved in the direction to detect the track zero position immediately after the power is turned on, and the floppy disk drive device can detect the track zero position in a short time. This is something that can be provided.

[Brief explanation of drawings]

Figures 1 to 6 show an embodiment of the present invention. Figure 1 is a plan view of the main part, Figure 2 is a side view of the main part, and Figure 3 shows the configuration of the track zero position detection section. 4 is a block diagram of the main part, FIG. 5 is a flowchart showing the main processing by the microprocessor, FIG. 6 is a flowchart showing the step signal check processing by the microprocessor, and FIG. 7 is a diagram showing the main processing of the present invention. FIG. 7 is a circuit diagram showing another embodiment. 3...Floppy disk, 4...Magnetic head, 8...
Carrier, 10... Light shielding plate, 11... Track zero position detector, 12... Pulse motor, 13... Microprocessor, STOUT... Track zero detection flip-flop, PM... Setting area, DIRF... Direction flag, DIR... Direction signal,
STP...Step signal, TZS...Track zero signal.

Claims (1)

[Claims] 1 A magnetic head is brought into contact with a rotating floppy disk, and the magnetic head is moved in the radial direction of the floppy disk using a pulse motor in response to an external direction signal and a step signal, thereby writing and reading information to and from each track. In a floppy disk drive device that performs
A track zero position detector detects when the magnetic head reaches the track zero position, and when the position detector does not detect the track zero position at the time of start, the magnetic head is moved in the direction of the track zero from the outside and in the opposite direction. Outputting a drive signal for the pulse motor that moves the magnetic head in the direction of track zero regardless of the direction signal, and after the position detector detects the track zero position, moving the magnetic head in the direction of track zero from the outside and in the opposite direction. A floppy disk drive device comprising means for outputting a drive signal for the pulse motor in accordance with a direction signal for driving the pulse motor.