JPH0689517A - Disk driving device - Google Patents

Abstract

PURPOSE:To reduce power consumption in a senser circuit for detecting a track zero position in a floppy disk device. CONSTITUTION:This device is provided with a light emitting diode L5 and a phototransistor P5 for constituting the senser circuit for detecting the presence of the track zero position in a floppy disk. The light emitting diode L5 is not energized continuously and energized selectively by a NOR gate 27. An AND gate 36 is provided for detecting the vicinity of the track zero. A pulse is formed by a monomulti-vibrator 37 based on the output of the AND gate 36, and a light emitting element L5 is emitted by the pulse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device for recording or reproducing information by rotating a recording medium disk such as a floppy disk (flexible magnetic disk).

[0002]

2. Description of the Related Art In a floppy disk drive, the head is positioned with reference to track zero. Therefore, an optical sensor for detecting the head position corresponding to track zero is provided.

[0003]

By the way, in the conventional floppy disk device, the light emitting diode of the track zero sensor continuously emits light. Therefore, there is always power loss in the track zero sensor.

Therefore, an object of the present invention is to provide a disk drive device capable of reducing the power consumption in the track zero position detecting light emitting element.

[0005]

The present invention for achieving the above-mentioned object will be described with reference to the reference numerals of the drawings showing an embodiment. A disk rotating mechanism for rotating a recording medium disk (8), A recording or reproducing head (11) arranged to face the disc (8), and the disc (8)
A feed mechanism including a stepping motor (12) for changing the relative positional relationship between the head (11) and the head (11) in the track crossing direction, and the position of the track example of the head (11) and the disk (8). In a disk drive device including a track zero position detecting light emitting element and a light receiving element for detecting a relationship, a step signal for moving the head (11) by the stepping motor (12) and the head (11) are provided. A step direction signal indicating that the head is moved toward the track zero and the head (1
1) a near zero detection logic circuit for generating near track zero output in response to simultaneous occurrence of a signal indicating that the track zero is located within a predetermined number of tracks from the track zero, and the logic. The head obtained from the circuit (1
1) a near-zero pulse generation circuit that generates a pulse for a fixed time in response to an output indicating that the track is located near the track zero, and causes the light-emitting element to emit light during the generation period of the pulse near the zero. The present invention relates to a disk drive device characterized in that selection urging means is provided. The correspondence between the present invention and the embodiment will be described in more detail.
6, the near-zero pulse generation circuit is a monomultivibrator 37, and the selection energizing means is a NOR gate 27.

[0006]

According to the present invention, since the selection biasing means is provided and the light emitting element for detecting the track zero position is caused to emit light discontinuously, the power consumption of the light emitting element can be reduced. . The selective energization of the light emitting element automatically detects the track zero vicinity by the near-zero detection logic circuit and is accurately executed based on this detection signal.
There will be no situation where track zero detection becomes impossible.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a system in which a floppy disk drive device 3 is connected to an external device comprising a common CPU 1 and a floppy disk drive control circuit device 2. The control circuit device 2 is generally called an FDD controller and includes a CPU interface, a controller / formatter section, an FDD interface, etc., and exchanges signals with the disk drive device 3 and supplies signals. FIG. 1 shows a data / control signal line 4, a motor-on signal supply line 5, a ready signal supply line 6, and a clock signal line 7, which are selected from a large number of signal lines. . The motor-on signal is a drive control signal for rotating the disc drive motors of the plurality of disc drive devices 3, and the ready signal is a ready signal indicating that the disc has reached a certain number of revolutions and recording or reproduction can be started. Is.

The disk drive device 3 is arranged so as to face the disk drive motor 9 for rotating the floppy disk 8, a disk drive motor control circuit 10 for controlling the disk drive motor 8 and the disk 8, and selectively makes contact during recording or reproduction. Magnetic head 11, a stepping motor 12 for feeding the head 11 to determine the radial position of the head 11 on the disk 8, that is, a scanning track, a control circuit 13 of the motor 12, and a read / write circuit connected to the head 11. 14, a sensor circuit 15, a drive control circuit 16, and an interface circuit 1 arranged between the external control circuit device 2 and the drive control circuit 16.
7 and 5 as a light emitting element connected to the sensor circuit 15.
It includes two LEDs or light emitting diodes L1 to L5 and a light receiving element (not shown).

FIG. 2 shows the floppy disk 8 of FIG. 1 in detail. The floppy disk 8 is mounted in the disk rotating mechanism while being accommodated in the rectangular jacket 18, and is rotated in the jacket 18. The disk 8 has an index hole 20 in addition to the central hole 19. The jacket 18 has an opening 21 for allowing the disk 8 to be clamped, an opening 22 for allowing the head 11 to come into contact with the disk 8, a cutout 23 for detecting write protection, that is, for detecting whether or not recording has been completed, and a disk. 8 has a front and back detecting notch 24 and an opening 25 for enabling detection of the index hole 20.

FIG. 3 shows the sensor circuit 15 of FIG. 1 in detail. To form a photodetector, an index (INDEX) detecting light emitting diode L1, a write protect (FPT) detecting light emitting diode L2, a disc (MEDIA) presence / absence detecting light emitting diode L3, and a disc front and back (SIDE) detecting light emission The diode L4 and the light emitting diode L5 for detecting the track (TRACK) zero position of the head 11 are connected in series, and one end of this series circuit is +12 via a resistor 26 for obtaining a constant current characteristic.
It is connected to the power source of V and has the other end connected to the output terminal of the NOR gate 27 of the input inverting type. Therefore, when the output of the NOR gate 27 as the selection energizing means becomes low level (ground level), all the light emitting diodes L1 to L5 are turned on at the same time. P1 to P5 are phototransistors as light emitting elements which are arranged to face the light emitting diodes L1 to L5. The light emitting diode L1 as the index detector and the phototransistor P1 are arranged corresponding to the opening 25 of the jacket 18, the light emitting diode L2 as the write protect detector and the phototransistor P2 are arranged corresponding to the notch 23, and the disc presence / absence detection is performed. The light emitting diode L3 and the phototransistor P3 as the receiver are arranged corresponding to the mounting position of the jacket 18, the light emitting diode L4 and the phototransistor P4 as the front and back detectors are arranged corresponding to the cutout 24, and the track zero detector is provided. The light emitting diode L5 and the phototransistor P5 are arranged corresponding to the zero track position of the carriage (not shown) of the head 11.

The emitters of the phototransistors P1 to P5 are commonly connected and grounded, and the collectors thereof are
It is connected to the volt power supply as well as to each detection output line. That is, the first phototransistor P1 is connected to the output line 28 and also to the reset terminal of the counter 29, and the second to fourth phototransistors P2 to P4 are connected to the D-type flip-flop 30 as a holding circuit. The phototransistor P5 is connected to the input terminals D1, D2 and D3, and is connected to the output line 31. The clock input terminal CL of the D flip-flop 30 is coupled to the output line of the counter 29 and responds to the trailing edge of the output pulse.

Counter 29 is configured to count the clock signal on line 7 by 10 and return to zero, and output line 32 is connected to obtain the low level strobe output pulse which occurs at the time of zero count. Counter 29
Output line 32 is coupled to the inverting input of NOR gate 27. Therefore, when a low level output is generated from the counter 29, the output of the NOR gate 27, that is, the cathode of the light emitting diode L1 becomes low level (ground level).
The two light emitting diodes L1 to L5 are turned on.

The light emitting diodes L1 to L5 are countered by the counter 29.
Exclusive OR gate 3 to light other than the output of
3 and a NOT circuit 34, a rise time detection circuit of the disk drive motor 9 is provided, and a low level signal obtained corresponding to the rise time is supplied to the inverting input of the NOR gate 27. One input line 5 of the exclusive OR gate 33 is substantially the same as the motor-on signal supply line 5 of FIG. 1, and the other input line 6 is substantially the same as the ready signal supply line 6 of FIG. is there. Therefore, the output of the NOT circuit 34 is at a low level from the time when the low-level motor signal is generated to the time when the low-level ready signal is generated, and the light emitting diodes L1 to L5 are turned on.

Reference numeral 35 is a low level recalibration (RE
The CALIBRATE signal is applied to the inverting input terminal of the NOR circuit 27. Therefore, the light emitting diodes L1 to L5 are turned on during the recalibration operation in synchronization with the turning on of the power switch of the system. The head 11 is returned to the zero track by the recalibration operation.

The NAND gate 36 detects that the scanning track is near zero (tracks 0 to 4), and a step signal obtained from the CPU 1 and a signal indicating that the step number is to be increased in the direction of the larger track number and the track 0. The track zero vicinity is detected based on the signals of 4 to 4, and the mono multivibrator 37 of about 12 msec is triggered. Therefore, when the vicinity of track zero is detected, the low level signal having a pulse width of 12 msec is NOR
Input to the gate 27, and the light emitting diodes L1 to L5 are turned on.

Next, the operation of the apparatus shown in FIGS. 1 to 3 will be described with reference to FIG. 4 showing the states of points A to H in FIG. When the disk 8 is mounted on the rotating device and the power switch of the system is turned on, the recalibration operation is performed, the head moves to the track zero, and the low level output of the line 35 turns on the light emitting diodes L1 to L5. The mounting state of No. 8 is detected. That is, the write protection (FPT) is detected by the phototransistor P2, and the phototransistor P2 is detected.
The presence or absence of the disk 8 is detected at 3, the front and back of the disk 8 are detected at the phototransistor P4, and the track zero is detected at the phototransistor P5. When the vicinity of track zero is detected, a negative pulse of 12 msec is generated from the mono multivibrator 37 and the light emitting diodes L1 to L5 are turned on.

On the other hand, when the disk 8 is mounted on the drive unit 3 with the power switch of the system turned on in advance, the clock signal has already been generated, so the counter 29 as a pulse generation circuit operates. Then, t1 in FIG.
As shown before the time point, negative pulses are generated at a constant cycle.
That is, the clock signal is input to the counter 29 at a period of 20 msec, for example, and a pulse is generated when counting 10 pulses and returning to zero. Therefore, the period divided by 1/10 is 200 mse
A negative pulse is generated on line 32 at c. Therefore, in FIG.
In response to the negative counter output pulse of (E), the output of the NOR gate 27 also becomes negative as shown in FIG. 4 (A), and the light emitting diodes L1 to L5 are turned on only during the period of this negative pulse. If the light emitting diodes L1 to L5 are turned on, the light emitting diodes L1 to L5 and the phototransistors P1 to
Each state is detected by a photodetector consisting of P5.
In FIG. 4, since the motor 9 has not yet rotated at time t0, index detection is not performed, and the light emitting diode L2
~ L5 and phototransistors P2 to P5, write protect (FPT), presence / absence of disk (MEDI
A), front and back of the disc (SIDE), and track zero are detected. The data obtained from the phototransistors P2 to P4 is held by the D-type flip-flop 30 which receives the output pulse of the counter 29 as a clock input, and is output from the output terminals Q1 to Q3 from FIG.
Outputs shown in (F), (G), and (H) are obtained. Figure 4
At time t1 until the negative motor-on signal is given as shown in FIG. 4 (B), the light emission is controlled by the pulse of the cycle of 200 msec, and the light emitting diodes L1 to L5 are intermittently turned on.

When a motor-on signal is generated at time t1,
The output of the NOT circuit 34 shown in FIG.
The output of the gate 27 also becomes low level as shown in FIG. Therefore, the light emitting diodes L1 to L5 are continuously lit regardless of the output of the counter 29. When the disk 8 rotates from the time point t1, index detection is performed, and a negative pulse shown in FIG. 4D is generated from the first phototransistor P1 and input to the counter 29 as a reset signal.
Therefore, the counter 29 is reset every time the index detection pulse is generated and is returned to the zero count, so that a negative pulse is generated even at this time. However, since the output of the NOT circuit 34 is at the low level until t2 when the low-level ready signal shown in FIG. 4C is generated, the light emitting diodes L1 to L5 are continuously lit. When the ready signal indicating that the disk 8 has reached the predetermined rotation state is supplied from the CPU 1 at time t2, the output of the exclusive OR circuit 33 becomes low level and the output of the NOT circuit 34 becomes high level. Therefore, the motor-on signal shown in FIG. 4B does not contribute to the lighting of the light emitting diodes L1 to L5. However, since the negative pulse is periodically generated from the counter 20 as shown in FIG. 4 (E), the index detection is continued. This will be described in more detail. At time t2 when the ready signal is generated, the rotation speed of the disk 8 reaches a constant rotation speed synchronized with the clock. Now, assuming that the rotation speed of the disk 8 is 300 rpm, indexes are detected at intervals of 200 msec. When the ready signal is generated at time t2 synchronized with the fall of the index signal, the next fall of the index is t3 200 msec later. Since the counter 29 is reset by the index signal obtained from the phototransistor P1 and generates a pulse at a cycle of 200 msec, for example, a negative pulse is generated from the NOR gate 27 180 msec after t2 of the generation of the ready signal and the light emitting diodes L1 to L5. Lights up. In other words, the index hole 20 is 20
The light-emitting diodes L1 to L5 are turned on from before msec. Therefore, the light emitting diodes LL to L5 are turned on during the passage of the index hole 20, and the index can be detected.

As is apparent from the above, in this embodiment, the light emitting diodes L2 to L4 for detecting the write protection, the presence / absence of the disc, and the front and the back of the disc are controlled to emit light intermittently by the pulse train based on the clock signal. It is possible to reduce power consumption. In addition,
Since the D-type flip-flop 30 holds the detection signal even if the light emitting diodes L1 to L5 are intermittently energized, the state of the floppy disk drive device 3 can be notified to the CPU 1.

[0020]

[Modification] The present invention is not limited to the above-mentioned embodiment, and the following modifications are possible. (A) Light emitting diode L1 for index detection,
The other state detecting light emitting diodes L2 to L5 are separated, the light emitting diodes L2 to L5 are turned on at a constant cycle based on the clock signal regardless of the index detecting signal, and the index detecting light emitting diode L1 is shown in FIG.
You may make it light by the method of. (B) In the embodiment, five light emitting diodes L1 to L5 are connected in series and all of them are made to emit light in the same state. However, all of them may not be made to emit light under the same condition but may be made to emit light independently. Further, one or a plurality of ones selected from L1 to L5 may be intermittently turned on, and the rest may be continuously turned on as in the conventional case. (C) The light emitting diodes L1 to L5 may be connected in parallel instead of in series. (D) It does not matter if the number of state detection light emitting diodes is increased or decreased. (E) It is also applicable to an optical disk device using an optical head.

[Brief description of drawings]

FIG. 1 is a block diagram showing a disk drive device according to an embodiment of the present invention.

FIG. 2 is a plan view showing an example of a floppy disk.

FIG. 3 is a block diagram showing a sensor circuit.

FIG. 4 is a waveform diagram of each part of FIG.

[Explanation of symbols]

 29 Counter 30 D-type flip-flop L3 Disc presence / absence detection light emitting diode

Claims (1)

[Claims] 1. A disk rotating mechanism for rotating a recording medium disk (8), a recording or reproducing head (11) arranged to face the disk (8), the disk (8) and the head. The relationship between the feed mechanism including the stepping motor (12) for changing the relative positional relationship with the track (11) in the track crossing direction and the position of the track zero of the head (11) and the disk (8) is detected. In a disk drive device including a light emitting element and a light receiving element for detecting track zero position, the head (11) is provided by the stepping motor (12).
Signal for moving the head and the head (11)
And a step direction signal indicating that the head (11) is located within a predetermined number of tracks from the track zero are simultaneously generated. And a near-zero detection logic circuit for generating a near-zero track output in response to the pulse, and a pulse for a fixed time in response to an output obtained from the logic circuit and indicating that the head (11) is located near the zero track. A disk drive device comprising: a near-zero pulse generation circuit for generating a pulse; and a selection urging means for causing the light emitting element to emit light during a period of generation of a pulse indicating the near zero.