JPH0756729B2 - Disk drive - Google Patents

Description

TECHNICAL FIELD The present invention relates to a disk drive device for rotating a recording medium disk such as a floppy disk (flexible magnetic disk) to record or reproduce information.

2. Description of the Related Art A floppy disk device is provided with a track zero sensor including a light emitting element and a light receiving element for detecting whether or not the recording / reproducing head is positioned at track zero.
The track zero sensor outputs a signal indicating that the head has reached track zero by detecting the position of the carriage of the head.

By the way, in the conventional floppy disk device,
Since the light emitting element of the track zero sensor continuously emitted light during the driving period, the power consumption was inevitably increased.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk drive device capable of reducing the power consumption of a light emitting element for detecting track zero.

According to the present invention for achieving the above object, there is provided a disk rotating mechanism for rotating a recording medium disk (8), and a recording or reproducing head (1) arranged to face the disk (8).
1), a head feed mechanism including a stepping motor (12) for changing the position of the head (11) in the track crossing direction, and the relationship between the head (11) and the position of the track zero of the disk (8). A track zero position detecting light emitting element and a light receiving element, a line (35) for transmitting a recalibration signal for instructing the head (11) to return to the track zero, and the stepping motor (12 ), A step signal for moving the head (11), a step direction signal indicating that the head (11) is moved in a direction toward the track zero, and the head (11) is a predetermined number of tocks from the track zero. The near zero detection, such as an AND gate (36), generates track near zero output in response to the simultaneous occurrence of a signal indicating that it is located within the range of A logic circuit and a head (11) obtained from the logic circuit, which generates a pulse for a certain time in response to an output indicating that the head (11) is located near track zero, such as a mono-multivibrator (37) A near-zero pulse generation circuit, the recalibration signal transmission line (35), the near-zero pulse generation circuit, and the light-emitting element are connected, and the recalibration is performed in response to the recalibration signal and the near-zero pulse, respectively. The present invention relates to a disk drive device including a circuit for causing the light emitting element to emit light during a signal generation period and a near zero pulse generation period.

Effect of the Invention The present invention has the following effects.

(A) Since the light emitting element for detecting track zero does not continuously emit light, power consumption is reduced.

(B) The light emitting element for detecting track zero emits light not only during the period when the recalibration signal is generated but also during the period when the near-zero pulse is generated. Therefore, even when the head is positioned at the track zero other than the recalibration operation, the light emitting element for detecting the track zero emits light and the track zero can be detected.

Embodiment Next, a floppy disk drive device according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a system in which a floppy disk drive device (3) is coupled to an external device composed of 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 unit, an FDD interface, etc., and exchanges signals with the disk drive device (3) and supplies signals. Eggplant FIG. 1 shows a data and control signal line (4), a motor-on signal supply line (5), a ready (READY) signal supply line (6), and a clock signal line selected from a large number of signal lines. (7) is shown. The motor-on signal is sent to a plurality of disk drive devices (3).
Is a drive control signal for rotating the disk drive motor, and the ready signal is a preparation completion signal indicating that the disk has reached a certain number of rotations and recording or reproduction can be started.

The disk drive device (3) is a floppy disk (8).
A disk drive motor (9) for rotating the disk, a disk drive motor control circuit (10) for controlling the disk, and a magnetic head (11) arranged to face the disk (8) and selectively contacted during recording or reproduction. , A stepping motor (1) which feeds the head (11) to determine the radial position of the head (11) on the disk (8) or the scanning track.
2), control circuit (13) of this motor (12), head (1)
1) read / write circuit (14), sensor circuit (15), drive control circuit (16), external control circuit device (2) and drive control circuit (1)
6), an interface circuit (17) arranged between
And a light receiving element 5 LED i.e. light emitting diodes L ₁ ~L ₅ as connected light emitting elements in the sensor circuit (15) and that is shown are omitted.

FIG. 2 shows in detail the floppy disk (8) of FIG. The floppy disk (8) is mounted in the disk rotating mechanism while being housed 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) to allow clamping of the disk (8) and a head (1).
Opening (2) to allow access to the disk (8) of 1)
2) It becomes possible to detect the notch (23) for detecting the write protect, that is, the notch (24) for detecting whether or not the data has been recorded, the notch (24) for detecting the front and back of the disk (8), and the index hole (20). With an opening (25).

FIG. 3 shows the sensor circuit (15) of FIG. 1 in detail. The index (INDE
X) Light emitting diode for detection L ₁ , write protect (FPT)
Light-emitting diode L ₂ for detection, light-emitting diode L ₃ for detecting the presence / absence of a disk (MEDIA), light-emitting diode L ₄ for detecting the front and back of the disk (SIDE), and track (TRACK) of the head (11)
Zero-position detecting light-emitting diodes L ₅ are connected in series with each other, one end of this series circuit is connected to a + 12V power source through a resistor (26) for obtaining a constant current characteristic, and the other end is an input inverting NOR circuit. It is connected to the output terminal of the gate (27).
Therefore, when the output of the NOR gate (27) becomes low level (ground level), all the light emitting diodes L _{1 to} L ₅ are turned on at the same time. P _{1 to} P ₅ are phototransistors as light receiving elements arranged to face the light emitting diodes L _{1 to} L ₅ . The light emitting diode L ₁ and the phototransistor P ₁ are in a jacket (18)
Corresponding to the opening (25) of the notch (23) with L ₂ and P ₂
L ₃ and P ₃ correspond to the mounting position of the jacket (18), L ₄ and P ₄ correspond to the notch (24), and L ₅ and P _{5 correspond} to the head ( It is arranged corresponding to the zero track position of the carrier (11).

The emitters of the phototransistors P _{1 to} P ₅ are commonly connected and grounded, and the collectors are connected to a 5 volt power source through a resistor R and also connected to respective detection output lines. That is, the first phototransistor P ₁ in addition to being connected to the output line (28), is connected to the reset terminal of the counter (29), the second to fourth phototransistors P ₂ ~
P ₄ is connected to the input terminals D ₁ , D ₂ and D ₃ of the D-type flip-flop (30) as a holding circuit, and the phototransistor P ₅ is connected to the output line (31). The clock input terminal CL of the D-type flip-flop (30) is the counter (29).
Of the output pulse of the output pulse and responds to the trailing edge of the output pulse.

The counter (29) is configured to count the clock signal on line (7) by 10 and return to zero, and the output line (32) is connected to obtain the low level strobe output pulse generated at the time of zero count. There is. The output line (32) of the counter (29) is coupled to the inverting input of the 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 L ₁ becomes low level (ground level), and the five light emitting diodes L _{1 to} L ₅ are turned on. .

In order to turn on the light emitting diodes L _{1 to} L ₅ other than the output of the counter (29), the exclusive OR gate (33) and the NOT circuit (3
4) and a rise time detection circuit for the disk drive motor (9) are 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 the ready signal of FIG. It is substantially the same as the supply line (6). 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 L _{1 to} L ₅ are turned on.

(35) is a low level RECALIBRATE
The signal is applied to the inverting input terminal of the NOR circuit (27). Therefore, the light-emitting diode L ₁ is activated during the recalibration operation in synchronization with the system power switch being turned on.
~ L ₅ lights up. Note that the head (1
1) is returned to zero track.

The NAND gate (36) detects that the head (11) is near track zero (tracks 0 to 4) and that the head (11) may be positioned at track zero. A track zero vicinity signal indicating that the head (11) formed based on the output of the counter is located on tracks 0 to 4, a step signal given from the CPU (1) and a step direction signal toward the track zero. Based on and, it is detected that the head (11) is near track zero and the head may go to track zero,
It is intended to trigger a 12 msec mono multivibrator (37). Therefore, when the track zero vicinity is detected,
A low level signal with a pulse width of 12 msec is output by the NOR gate (2
7), and the light emitting diodes L _{1 to} L ₅ light up.

Next, the operation of the apparatus of FIGS. 1 to 3 will be described with reference to FIG. 4 showing the states of points A to H in FIG.

If the disk (8) is attached to the rotating device and the system power switch is turned on, a recalibration operation is performed,
Head is moved to track zero, the light emitting diode L ₁ ~L ₅ and at low level output of the line (35) lights, the mounting state of the disk (8) is detected. That is, a phototransistor
The write protect (FPT) is detected by P ₂ , and the presence or absence of the disk (8) is detected by the phototransistor P ₃ .
Front and back of the detection of the disk (8) by the phototransistor P ₄ is made, the detection of the track zero is made by the phototransistor P _5. When the track near zero is detected, a negative pulse of 12 msec is generated from the mono multivibrator (37),
The light emitting diodes L _{1 to} L ₅ are turned on.

On the other hand, when the disk (8) is attached to 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) operates, As shown before time t _{1 in} FIG. 4, negative pulses are generated at a constant cycle. That is, the clock signal is input to the counter (29) at a cycle of 20 msec, for example, and a pulse is generated when 10 pulses are counted and the value returns to zero. Therefore, a negative pulse is generated on the line (32) with a period of 200 msec divided by 1/10. Therefore, in response to the negative counter output pulse shown in FIG. 4 (E), the output of the NOR gate (27) is also shown in FIG. 4 (A).
As shown in, the light-emitting diodes L _{1 to} L ₅ are turned on only during the period of the negative pulse. When the light emitting diodes L _{1 to} L ₅ are turned on, each state is detected by the photodetector including the light emitting diodes L _{1 to} L ₅ and the phototransistors P _{1 to} P ₅ during this period. In FIG. 4, since the motor (9) has not yet rotated at time t ₀ , index detection is not performed and L _{2 to} L ₅
One Manzanillo and P ₂ to P ₅ in write protect (FPT), the presence or absence of the disk (MEDIA), front and back of the disk (SIDE), and the detection of track zero is made. The D-type flip-flop (30), which receives the output pulse of the counter (29) as a clock input, holds the data obtained from P _{2 to} P ₄ during the light emission period and outputs the data from the output terminals Q _{1 to} Q ₃ to the fourth terminal. Figure (F) (G)
The output as shown in (H) is obtained. At time t _{1 in} FIG. 4, until the negative motor-on signal is given as shown in FIG. 4 (B), the light emission is controlled by the pulse having the cycle of 200 msec.
The light emitting diodes L _{1 to} L ₅ are turned on intermittently.

When the motor-on signal is generated at time t ₁ , the output of the NOT circuit (34) in FIG. 3 becomes low level, and the output of the NOR gate (27) also becomes low level as shown in FIG. 4 (A). Therefore, the light emitting diode is independent of the output of the counter (29).
L _{1 to} L ₅ are lit continuously. When the disk (8) rotates from the time t ₁ , index detection is performed, and a negative pulse shown in FIG. 4 (D) is generated from the _first phototransistor P ₁ .
Input as a reset signal to the counter (29). Therefore, the counter (29) is reset every time the index detection pulse is generated and returned to the zero count, and a negative pulse is generated at this point as well. However, NOT until t ₂ when the ready (READY) signal is generated at the low level shown in FIG. 4 (C).
Since the output of the circuit (34) is at a low level, the light emitting diodes L _{1 to} L ₅ are continuously lit. At the time of t ₂ , the ready signal indicating that the disk (8) has reached the predetermined rotation state is the CPU.
When supplied from (1), the output of the exclusive OR circuit (33) goes low and the output of the NOT circuit (34) goes high. Therefore, motor on signal of FIG. 4 (B) will not participate in the lighting of the light emitting diode L ₁ ~L _5. But the fourth
Since a negative pulse is periodically generated from the counter (29) as shown in FIG. 6 (E), the index detection is continued.
To explain this in more detail, t _{2 at} which the ready signal is generated
At this time, the rotation speed of the disk (8) has reached 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 ready signal occurs at t ₂ when synchronized with the trailing edge of the rising i.e. negative index pulse of Indetsukusu signal, the rising of the next Indetsukusu is later 200 msec t
It becomes ₃ . The counter (29) is reset by the trailing edge of the index signal obtained from the phototransistor P ₁ , that is, the leading edge of the negative index pulse to immediately generate a negative counter output pulse, and then generate a pulse with a period of 200 msec. for example 180m from t ₂ when the ready signal generator
A negative pulse is generated from the NOR gate (27) after sec, and the light emitting diodes L _{1 to} L ₅ are turned on. That is, the index hole (2
The light emitting diodes L _{1 to} L ₅ are turned on 20 msec before the time point when (0) has passed through the photodetector. Therefore, the light emitting diodes L _{1 to} L ₅ are lit during the passage of the index hole (20),
Index detection is possible.

As is apparent from the above, this embodiment has the following advantages in addition to the advantages described in the section of the description of the function and effect of the invention.

(A) write protect, whether the disk, the light emitting diode L ₂ ~L ₄ for detecting the front and back of the disk is emitted controlled by a pulse train based on the clock signal, since the intermittent lighting, reducing the power consumption of the light emitting diode Can be done.

(B) The index detection light-emitting diode L ₁ lights continuously from t ₁ when the motor-on signal is generated to t ₂ when the ready signal is generated, and then lights in synchronization with the index detection signal, resulting in a large power consumption. The index can be surely detected in a state of being reduced to.

(C) Since the five light emitting diodes L _{1 to} L ₅ are connected in series, it becomes unnecessary to independently connect a resistor for providing a constant current characteristic to each of the light emitting diodes L _{1 to} L ₅ .
Power consumption can be significantly reduced. In addition, the control of the light emitting diodes L _{1 to} L ₅ becomes easy.

Modifications The present invention is not limited to the above-described embodiments, and for example, the following modifications are possible.

(A) The light-emitting diode L ₁ for index detection and the other light-emitting diodes L _{2 to} L ₅ for state detection are separated, and the light-emitting diodes L _{2 to} L ₅ are based on the clock signal regardless of the index detection signal. Alternatively, the index detection light-emitting diode L ₁ may be turned on in a fixed cycle by the method shown in FIG.

(B) In the embodiment, five light emitting diodes L _{1 to} L ₅ 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 L _{1 to} L ₅ may be intermittently turned on, and the rest may be continuously turned on as in the conventional case.

(C) The light emitting diodes L _{1 to} L ₅ may be connected in parallel instead of being connected 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 disc device using an optical head.

[Brief description of drawings]

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 of a sensor circuit, and FIG. It is a waveform diagram of each part of the figure. (1) …… CPU, (2) …… control circuit device, (3) ……
Flotpie disk drive, (5) …… Motor-on signal supply line, (6) …… Lady signal supply line,
(7) …… Clock signal line, (8) …… Floppy disk, (9) …… Disk drive motor, (10) ……
Disk drive motor control circuit, (11) …… Head, (1
2) …… Stepping motor, (15) …… Sensor circuit,
(27) …… NOR gate, (29) …… Counter, (30)…
… Flip Flop, (33) …… Exclusive OR Gate, L ₁ ~
L ₅ …… Light emitting diode, P _{1 to} P ₅ …… Phototransistor.

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), and a track crossing direction of the head (11). Head feed mechanism including a stepping motor (12) for changing the position of the track, and a light emitting element and a light receiving element for detecting the track zero position for detecting the relationship between the position of the track zero of the head (11) and the disk (8). And a line (35) for transmitting a recalibration signal for instructing to return the head (11) to the track zero.
And a step signal for moving the head (11) by the stepping motor (12), a step direction signal indicating that the head (11) is moved in the direction toward the track zero, and the head (11). A near zero detection logic circuit for generating a near track zero output in response to the simultaneous occurrence of a signal indicating that is located within a range of a predetermined number of tocks from the track zero; A near-zero pulse generation circuit that generates a pulse for a fixed time in response to an output indicating that the obtained head (11) is located near the track zero, the recalibration signal transmission line (35), and the A generation period of the recalibration signal connected to the near-zero pulse generation circuit and the light-emitting element and in response to the recalibration signal and the near-zero pulse, respectively. Disk drive device consisting of a circuit for light emitting the light emitting element and generation period of the near zero pulses.