JPS6319948B2 - - Google Patents

Description

TECHNICAL FIELD 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).

Prior Art A floppy disk has an index hole for determining the reference position of the track and detecting the rotational speed of the disk, and a jacket for detecting whether or not the disk has already been recorded to protect the recording. A notch is provided in the jacket for detecting the front and back sides of the disk. These are optically detected by a light emitting element and a light receiving element which are arranged opposite to each other. However, these light emitting elements are provided independently from each other and are always emitted in synchronization with the power-on of the system, resulting in large power consumption.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a disk drive device that consumes less power.

Structure of the Invention To achieve the above object, the present invention includes a disk drive motor for rotating a recording medium disk, a disk drive motor control circuit for driving the disk drive motor in response to a motor-on signal, and a disk drive motor control circuit for driving the disk drive motor in response to a motor-on signal. a recording or reproducing head disposed opposite to the disk; a feeding mechanism such as a stepping motor for changing the relative positional relationship between the disk and the head in the cross-track direction, that is, in the radial direction of the disk; A light-emitting element and a light-receiving element arranged to detect passage of an optically detectable index provided, and supplying a recording or reproduction readiness signal (ready signal) indicating that the disk has reached a certain rotation speed. For example
A ready signal supply circuit such as a CPU and the motor on signal are generated, but during a period when the ready signal is not generated, the light emitting element is caused to emit light continuously, and the ready signal is generated. The present invention relates to a disk drive device comprising a light emission control circuit for causing the light emitting element to emit light intermittently in correspondence with a period during which the index passes between the light emitting element and the light receiving element. .

Effects of the Invention According to the above invention, the light emitting element is lit continuously at least during the period from the generation of the motor-on signal until the generation of the ready signal, and thereafter is lit intermittently in correspondence with the passing of the indicator. Therefore, the index can be detected accurately while reducing power consumption.

Embodiment Next, a floppy disk drive device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 shows a system in which a floppy disk drive device 3 is coupled 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
It is called an FDD controller and includes a CPU interface, a controller/formater section, an FDD interface, etc., and exchanges signals with the disk drive device 3 and supplies signals. FIG. 1 shows a data and control signal line 4, a motor-on signal supply line 5, a READY signal supply line 6, and a clock signal line 7 selected from a large number of signal lines. There is. The motor on signal is a drive control signal for rotating the disk drive motors of the plurality of disk drive devices 3, and the ready signal indicates that the disk has reached a certain rotation speed and is ready to start recording or playback. It's a signal.

The disk drive device 3 is a floppy disk 8.
a disk drive motor 9 for rotating the disk drive motor 9, and a disk drive motor control circuit 1 for controlling the disk drive motor 9 for rotating the disk drive motor 9;
0, a magnetic head 11 arranged opposite to the disk 8 and selectively contacted during recording or reproduction;
a stepping motor 12 for feeding the head 11 to determine the radial position or scanning track on the disk 8; a control circuit 1 for this motor 12;
3. A read/write circuit 14 connected to the head 11, a sensor circuit 15, a drive control circuit 16, an interface circuit 17 disposed between the external control circuit device 2 and the drive control circuit 16, and a sensor circuit. It includes five LEDs, that is, light emitting diodes L ₁ to _{L 5} as light emitting elements connected to 15, and a light receiving element whose illustration is omitted.

FIG. 2 shows the floppy disk 8 of FIG. 1 in detail. The floppy disk 8 is housed in a rectangular jacket 18 and is attached to a disk rotating mechanism, and is rotated within the jacket 18. In addition to the central hole 19, the disk 8 has an index hole 20. Jacket 1
8 has an opening 2 for allowing the disk 8 to be clamped.
1. An opening 22 for allowing the head 11 to contact the disk 8, a notch 23 for detecting write protection, that is, for detecting whether recording has been completed, and the disk 8.
It has a notch 24 for front and back detection, and an opening 25 to enable detection of the index hole 20.

FIG. 3 shows the sensor circuit 15 of FIG. 1 in detail. To configure the photodetector, a light emitting diode L ₁ for index (INDEX) detection, a light emitting diode L ₂ for light protect (FPT) detection,
A light emitting diode L ₃ for detecting the presence or absence of a disk (MEDIA), a light emitting diode L ₄ for detecting the front and back sides of the disk (SIDE), and a light emitting diode L ₅ for detecting the zero position of the track (TRACK) of the head 11 are connected in series with each other. One end of the circuit is connected to a +12V power supply via a resistor 26 for obtaining constant current characteristics, and the other end is connected to an output terminal of a NOR gate 27 of an input inversion type. Therefore NOR gate 27
When the output becomes low level (ground level), all the light emitting diodes _L1 to _L5 light up at the same time. _P1
~ _P5 is a phototransistor as a light receiving element arranged opposite to the light emitting diodes _L1 ~ _L5 . A light emitting diode L ₁ and a phototransistor P ₁ are arranged corresponding to the opening 25 of the jacket 18, and L ₂ and P ₂
is arranged correspondingly to the notch 23, _L3 and _P3 are arranged correspondingly to the mounting position of the jacket 18, and L4 and _P3 are arranged correspondingly to the mounting position of the jacket 18.
P ₄ corresponds to the notch 24, and L ₅ and P ₅ correspond to the zero track position of the carriage (not shown) of the head 11.

The emitters of phototransistors P ₁ to _{P 5} are commonly connected to ground, and the collectors are connected to 5 through a resistor R.
volt power supply and to the respective detection output lines. 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 a D-type flip-flop as a holding circuit. 30 input terminals D ₁ , D ₂ , D ₃ , and the phototransistor
P ₅ is connected to output line 31. In addition,
Clock input terminal of D-type flip-flop 30
CL is coupled to the output line of counter 29 and is responsive to the trailing edge of the output pulse.

Counter 29 is configured to count the clock signal on line 7 to 10 and return to zero, and output line 32 is connected to obtain a low level strobe output pulse which occurs at zero count.
Output line 32 of counter 29 is NOR gate 2
7's inverting input. 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 a low level (ground level), and the five light emitting diodes _L1 to _L5 light up.

_Exclusive OR gate ₃
A rise time detection circuit for the disk drive motor 9 is provided, which includes a rise time detection circuit 3 and a NOT circuit 34, 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.
The other input line 6 is substantially the same as the ready signal supply line 6 of FIG. Therefore, from the time when the low-level motor signal is generated until the time when the low-level ready signal is generated, the output of the NOT circuit 34 is at a low level, and the light emitting diodes _L1 to _L5 are lit.

Reference numeral 35 supplies a low-level RECALIBRATE signal to the inverting input terminal of the NOR circuit 27. Therefore, the light emitting diodes _L1 to _L5 light up while performing the recalibration operation in synchronization with turning on the power switch of the system. In addition, head 11 is activated by recalibration operation.
is returned to the zero track.

The NAND gate 36 detects that the scanning track is near zero (tracks 0 to 4), and uses a step signal obtained from the CPU 1, a signal indicating that the scanning track is to be stepped in the direction of a larger track number, and a signal indicating that the scanning track is near zero (tracks 0 to 4). Based on the signal, the vicinity of track zero is detected and the mono multivibrator 37 is triggered for about 12 msec. Therefore, when a track near zero is detected, a low level signal having a pulse width of 12 msec is input to the NOR 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 explained with reference to FIG. 4, which shows the states of points A to H in FIG. 3.

When the disk 8 is mounted on the rotary device and the power switch of the system is turned on, the recalibration operation starts, the head moves to track zero, and the low level output of the line 35 lights up the light emitting diode L ₁ ~.
_L5 lights up, and the attachment state of disk 8 is detected. That is, write protection (FPT) is detected at phototransistor _P2 , and phototransistor P2 detects write protection (FPT).
The presence or absence of the disk 8 is detected at _P3 , the front and back sides of the disk 8 are detected at phototransistor _P4 , and track zero is detected at phototransistor _P5 . Further, when the track near 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, if the disk 8 is installed in the drive unit 3 with the system power switch turned on in advance, the clock signal has already been generated, so the counter 29 operates and the clock signal _t1 in FIG. As shown before the point in time, negative pulses are generated at regular intervals. That is, a clock signal is input to the counter 29 at a period of 20 msec, for example, and a pulse is generated when the clock signal counts 10 pulses and returns to zero. Therefore, a negative pulse is generated on the line 32 at a period of 200 msec, which is divided by 1/10.
Therefore, in response to the negative counter output pulse shown in FIG. 4E, the output of the NOR gate 27 also becomes negative as shown in FIG. 4A, and the light emitting diodes _L1 to _L5 light up only during the period of this negative pulse. do. light emitting diode
When _L1 to _L5 are turned on, each state is detected during this period by a photodetector comprising light emitting diodes _L1 to _L5 and phototransistors _P1 to _P5 . In Fig. 4, motor 9 is not yet rotating at time t ₀ , so
No index detection is performed, L ₂ ~ L ₅ and P ₂ ~ P ₅
Depending on the type, write protection (FPT), presence or absence of a disk (MEDIA), front and back sides of the disk (SIDE),
And track zero is detected. Then, by using the D-type flip-flop 30 which uses the output pulse of the counter 29 as a clock input, P _{2 is} output during the light emission period.
The data obtained from ~ _P4 is retained and output terminal
Outputs as shown in FIG. 4 F, G, and H are obtained from Q ₁ to Q ₃ . Until a negative motor-on signal is given as shown in Figure 4B at time t ₁ in Figure 4,
Light emission is controlled by pulses with a period of 200 msec, and the light emitting diodes _L1 to _L5 are lit intermittently.

When the motor-on signal is generated at time _t1 , the output of the NOT circuit 34 in Fig. 3 becomes a low level, and the NOR
The output of the gate 27 also becomes low level as shown in FIG. 4A. Therefore, regardless of the output of the counter 29, the light emitting diodes L ₁ to _{L 5} are lit continuously. When the disk 8 rotates from time _t1 , index detection is performed, and the first phototransistor _P1 to the fourth phototransistor
A negative pulse shown in FIG. D is generated and input to the counter 29 as a reset signal. Therefore, the counter 29 is reset every time an index detection pulse is generated and is returned to zero count, so that a negative pulse is generated even at this point. However, until _t2 when the low level READY signal shown in FIG. 4C is generated, the output of the NOT circuit 34 is at a low level, so the light emitting diodes _L1 to _L5 are continuously lit. When a ready signal indicating that the disk 8 has reached a predetermined rotational state is supplied from the CPU 1 at time t ₂ , the output of the exclusive OR circuit 33 becomes a low level, and the NOT
The output of circuit 34 goes high. Therefore, the motor-on signal in FIG _.
It will no longer be involved in the lighting of _L5 . However, Fig. 4E
Since negative pulses are periodically generated from the counter 29 as shown in FIG. 2, index detection continues. To explain this in more detail, at time _t2 when the ready signal is generated, the rotation speed of the disk 8 has reached a constant rotation speed synchronized with the clock. Now, if the rotation speed of disk 8 is 300 rpm,
Indexes are detected at intervals of 200msec. The ready signal is synchronized with the falling edge of the index signal.
If this occurs at time t ₂ , the next index fall will occur 200 msec later at t ₃ . Since the counter 29 is reset by the index signal obtained from the phototransistor _P1 and generates pulses at a cycle of 200 msec, for example, from time _t2 of the ready signal generation,
After 180 msec, a negative pulse is generated from the NOR gate 27, and the light emitting diodes _L1 to _L5 light up. That is,
The light emitting diodes _L1 to _L5 light up 20 msec before the index hole 20 finishes passing through the photodetector. Therefore, the light emitting diodes _L1 to _L5 light up during the period of passage through the index hole 20, making index detection possible.

As is clear from the above, this embodiment has the following advantages.

(A) Light-emitting diodes L ₂ to _{L 4} detect write protection, the presence or absence of a disk, and the front and back sides of the disk.
Since the light emission is controlled by a pulse train based on a clock signal and is lit intermittently, the power consumption of the light emitting diode can be reduced.

(B) Light-emitting diode _L1 for index detection is
It lights up continuously from _t1 when the motor on signal is generated to _t2 when the ready signal is generated, and then lights up in synchronization with the index detection signal, so the index can be detected reliably with significantly reduced power consumption. I can do it.

(C) Since the five light emitting diodes _L1 to _L5 are connected in series, it is no longer necessary to independently connect a resistor to each light emitting diode _L1 to _L5 to provide constant current characteristics. Power consumption can be significantly reduced. Also, light emitting diode L ₁
~ _L5 control also becomes easier.

Modifications The present invention is not limited to the above-described embodiments, but can be modified, for example, as follows.

(a) A light emitting diode _L1 for index detection,
The light emitting diodes L2 to L5 are separated from the other state detection light emitting diodes _L2 to _L5 , and the light emitting diodes _L2 to _L5 are turned on at a constant cycle based on the clock signal regardless of the index detection signal. ₁ may be lit using the method shown in FIG.

(b) In the example, five light emitting diodes L ₁ to L ₅ are connected in series and all of them are made to emit light under the same conditions, but they may be made to emit light independently without making them all emit light under the same conditions. . Alternatively, one or more selected from L ₁ to _{L 5} may be lit intermittently, and the remaining lights may be lit continuously as in the past.

(c) The light emitting diodes L ₁ to _{L 5} may be connected in parallel instead of in series.

(d) There is no problem in increasing or decreasing the number of light-emitting diodes for status detection.

(e) It is also applicable to optical disk devices that use optical heads.

[Brief explanation of the drawing]

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 of a sensor circuit, and FIG. It is a waveform chart of each part of a figure. DESCRIPTION OF SYMBOLS 1... CPU, 2... Control circuit device, 3... Floppy disk drive device, 5... Motor on signal supply line, 6... Ready signal supply line, 7
... Clock signal line, 8 ... Floppy disk, 9 ... Disk drive motor, 10 ... Disk drive motor control circuit, 11 ... Head, 12
... Stepping motor, 15 ... Sensor circuit,
27...NOR gate, 29...Counter, 30
...Flip-flop, 33...Exclusive OR gate, _L1 to _L5 ...Light emitting diode, _P1 to _P5 ...Phototransistor.

Claims (1)

[Scope of Claims] 1. A disk drive motor for rotating a recording medium disk, a disk drive motor control circuit for driving the disk drive motor in response to a motor-on signal, and a recording medium disk disposed opposite to the disk. or a reproducing head; a feeding mechanism for changing the relative positional relationship between the disk and the head in the track crossing direction; and a feeding mechanism arranged to detect passage of an optically detectable index provided on the disk. a light-emitting element and a light-receiving element; a ready signal supply circuit that supplies a readiness signal for recording or reproduction indicating that the disk has reached a certain number of revolutions; The light emitting element is caused to emit light continuously during a period in which the signal is not generated, and the light emitting element is caused to emit light continuously during a period in which the readiness signal is generated, and the light emitting element is caused to emit light continuously in a period in which the readiness signal is generated, corresponding to a period in which the indicator passes between the light emitting element and the light receiving element. A disk drive device comprising a light emission control circuit for causing a light emitting element to emit light intermittently. 2. The disk drive device according to claim 1, wherein the disk is a flexible magnetic disk.