JPS6029970A - Disk driver - Google Patents

Abstract

PURPOSE:To reduce the power consumption amount and to detect accurately an index by turning on the light emitting elements consecutively for a period between the generation of a motor ON signal and the generation of a preparation end signal, then turning on intermittently those elements in response to the pass of the index. CONSTITUTION:When a motor ON signal is produced at a time point t1, the output of NOT circuit 34 is set at a low level. At the same time, the output of NOR gate 27 is also set at a low level. Thus light emitting diodes L1-L5 are turned on consecutively regardless of the output of a counter 29. Hereafter, the elements L1-L5 are turned on earlier by 20msec than a time point when an index hole 20 has passed through a photodetector. Therefore, the diodes are turned on while the hole 20 is passing, and an index can be detected. Furthermore the power consumption is greatly reduced and the diodes L1-L5 can be easily controlled since these diodes are connected in series.

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).

Conventional floppy disks have an index hole for determining the basic position of the track and detecting the rotational speed of the disk, and a jacket for detecting whether or not the disk is a recorded disk to protect the recording. A notch is provided in the jacket for detecting the front and back sides of the disc. These are optically detected by a light-emitting element and a light-receiving element arranged opposite to each other. However, these light emitting elements are provided independently from each other and are always generated in synchronization with the power supply of the system, resulting in high 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 for rotating the disk drive motor. A feeding mechanism, such as a stepping motor, for changing the relative positional relationship in the radial direction of the recording or reproducing disk, which is arranged to face the disk, and a feeding mechanism, such as a stepping motor, arranged to detect the passing of an optically detectable index provided on the disk. a light emitting element and a light receiving element; a ready signal supply circuit such as a C'PU that supplies a ready 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 the period when the signal is being generated but the ready signal is not being generated, and the light emitting element is made to emit light continuously during the period when the ready signal is being generated. The present invention relates to a disk drive device including 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.

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 passage of the indicator. Therefore, the index can be detected accurately while reducing power consumption.

Embodiment Next, a 70 disc drive device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 shows an external device consisting of a common CP TJ il+ and a 70-bit disk drive control circuit device (2).

A system in which a floppy disk drive device T31 is combined is shown. The control circuit device (2) is generally called an FDD controller, includes a CPU interface, a controller/format unit, an FDD interface, etc., and exchanges signals with the disk drive device (3) and supplies signals. . Figure 1 shows a signal selected from a large number of signal sources. data and control signal line (41), motor on signal supply line +51, ready (REA)
DY] signal 4jN& line (6) and a clock signal line (7).

Note that 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 recording or playback can be started. This is the preparation completion signal.

Disk drive device (31 is a floppy disk 181
A disk drive motor (9) for rotating the disk drive motor (9), a disk drive motor control circuit t101 for controlling the disk drive motor (9), a magnetic head 1111 disposed opposite to the disk 181, and selectively in contact with the disk 181 during recording or reproduction.A disk of head u11. (8) A stepping motor u that feeds the head (Lυ) to determine the radial position, i.e., the scanning track, on the
'lJ, the control circuit for this motor (+31. head t
read/write circuit (141,
Sensor circuit [151, drive control circuit (If
il, external control circuit device (2) and drive control circuit
+SLs, and a light receiving element whose illustration is omitted.

FIG. 2 shows the floppy disk 18 shown in FIG. 1 in detail. This floppy disk (81 is a rectangular jacket) [8Hc] is housed in the disk rotation mechanism and rotated inside the jacket. In addition to the central hole 11, the disk 181 has an index hole end.The jacket (Is) has an opening for allowing the crank 1 of the disk (81) to contact the head till notisk 18+. (2g, cut-out part (c) for detecting write protection, that is, to detect whether recording has been completed, cut-out part (241) for detecting the front and back sides of the disk (8)
, has an opening (c) to enable detection of the end of the index hole.

FIG. 3 shows the sensor circuit (151) in FIG. 1 in detail.In order to configure the photodetector,
DEX) detection light emitting diode L1, light protect (FPT) detection light emitting diode L2, disk (ME
Light emitting diode (L) for detecting the presence of DIA) L8%Light emitting diode (L) for detecting the front and back sides (SIDE) of the disk L head (1
11 tracks (TRAC'K) Light-emitting diodes L for zero position detection are connected in series with each other, and one end of this series circuit is connected to +1 through a resistor (c) to obtain constant current characteristics.
It is connected to a 2V power supply, and the other end is connected to the output terminal IC of an input inverting type OR gate N271. Therefore to OR
When the gate node Ω output reaches a low level (ground level), all the light emitting diodes LIS-La light up at the same time.P
I to P are phototransistors as receivers and elements arranged opposite to the light emitting diodes L1 to L. The light emitting diode L1 and the phototransistor P1 are arranged correspondingly to the opening (C) marked with a □ on the jacket, L, P, are arranged correspondingly to the notch I23, and Ll and Pl are arranged correspondingly to the opening (C) marked with a jacket □.
181, -Ll and P4 are arranged corresponding to the cutout (2), and L and PH& are arranged corresponding to the zero track position of the head aD (not shown).

The emitters of the phototransistors P1 to P are commonly connected to ground, and the collectors are connected to a 5 volt power supply Km via a resistor R, and are also connected to the respective detection output lines. That is, the first phototransistor P1 is connected not only to the output line (to) but also to the reset terminal of the counter r2!1, and the second to fourth phototransistors P2 to P- as a holding circuit. The input terminal DI%D1%DI rc of the D-type slip prop (to) is connected,
The phototransistor P is connected to the output line c3υ. Note that the clock input terminal CL of the D-type flip-flop circle is coupled to the output line of the counter (c) and responds to the trailing edge of the output pulse.

The counter (c) is configured with a VC so that it counts the clock signal on the line (7) by 10 and returns to zero vc, and the output line 6
The capacitor is connected so as to obtain a low level strobe output pulse generated by VC at zero count. The output line C33 of the counter is coupled to the inverting input of the NOR gate. - Therefore, when a low level output is generated from the counter (to), the output of 271, that is, the cathode of the light emitting diode L1 becomes P/I/ (ground level), and the five light emitting diodes L1 to L are Light.

In order to light up the light-emitting diodes L1 to L6 using signals other than the output of the counter, a rise time detection circuit (91) consisting of an exclusive OR gate and an OT circuit C is provided. The correspondingly obtained low level signal is applied to the inverting input of the NOR gate Q7.One input line of the exclusive OR gate (51 is substantially the same as the motor-on signal supply line (5) of FIG. The other input line +61 is substantially the same as the ready signal supply line (6) in Fig. 1. Therefore, from the time when the low level motor signal is generated to the time when the low level ready signal is generated, The output of the NOT circuit 8c141 becomes low level, and the light emitting diode LI-L* lights up.

(To) is low level Nori Caliplay) (RECALI
BRATE) No. 411 is applied to the inverting input terminal of the NOR circuit (2). Therefore, the light emitting diodes L1 to L are lit while the recalibration plate is operating in synchronization with turning on the power switch of the system. The head ttn is returned to the zero track by the recalibration plate operation.

When hitting the NAND gate, the scanning track is near zero (track θ
~4).

CP (J Therefore, when the vicinity of track zero is detected, a low level signal having a pulse width of 12m5ep is input to the NOR gate, and the light emitting diodes L, .about.L 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.

Attach the disk +81 to the rotating device and turn on the system power switch to activate the recalibration plate.
The head moves to track zero, and the light emitting diodes L, .about.L light up due to the low level output of line (G), and the mounting state of the disk (8) is detected. That is, the phototransistor P detects write protection (FPTJ is not detected), the phototransistor P detects the presence or absence of the disk +81, the phototransistor P4 detects the front and back of the disk (81), and the phototransistor P6 detects the track zero. Further, when the vicinity of track zero is detected, a 12m5ec pulse is generated from the mono multivibrator 3η, and the light emitting diodes L, .about.L are lit.

On the other hand, if the disk (8) is installed in the drive unit (3) with the system power switch already turned on (VC), the counter (c) will not operate because the clock signal has already been generated. , negative pulses are generated at regular intervals as shown before time 11 in FIG.

A clock signal is input to a counter at a period of 20 m5 ec, for example, and a pulse is generated when it counts 10 pulses and returns to zero. Therefore, "/l0VC divided period 200
A negative pulse is generated on line 8k at m5ec.

Therefore, in response to the negative counter output pulse shown in FIG. 4 [F], the output of the NOR gate (A) also becomes negative as shown in FIG. Lm lights up.Light emitting diodes L, ~L,
When lit, each state is detected during this period by a photodetector comprising light emitting diodes L+ to LM and phototransistors P, to P. In Figure 4, the motor (
9) Since it has not yet rotated, index detection is not performed, and write protection (FPT), presence or absence of a disc (MEDIA), front and back sides of the disc (SIDE), and track are determined by L, ~, P, ~P. A zero detection is made. The Dm flip-flop 5JC, which uses the output pulse of the counter (c) as a clock input, holds the data obtained from the light emission period tcp, ~P, and outputs the data from the output terminals Q+ to Qs as shown in Fig. 4 [F] (00 The output shown in Figure 4 is 200 m5 until a negative motor-on signal is given as shown in Figure 4 (31) at the 1° point in Figure 4.
Emission control is performed with a period of ec] (L), and the light emitting diodes L, ~L, are lit intermittently.

When the motor-on signal is generated at time 11, NO in Fig. 3 is generated.
The output of the T circuit circle becomes low level, and the NOR gate 12η
The output of the light emitting diode L also becomes low level as shown in FIG. 4+AI.
LLs lights up continuously. Disc from 18th point (8)
When it rotates, index detection is performed, and the jl pulse shown in FIG. 4 [F] is generated from the first phototransistor P1, and is input as the counter cXIvc reset signal. Therefore, the counter (c) is reset every time an index detection pulse is generated and returned to zero count, so that a negative pulse is generated even at this point. However, Fig. 4 (
(Until t, when a low-level READY signal indicating IC is generated, the output of the N01 circuit is at a low level, so the 1 light-emitting diodes LI to L are lit continuously. (When the ready signal indicating that has reached a predetermined rotational state is supplied from the CPU 11+, the output of the exclusive OR circuit becomes a low level, and the NO
The output of the example T circuit becomes high level rc. Therefore, the motor-on signal TBI in FIG. 4 does not affect the lighting of the light emitting diodes L1 to L. However, as shown in FIG. 4 [F], a negative pulse is periodically generated from the counter (C). Therefore, index detection continues.To explain this in more detail, at time t1 when the ready signal is generated, the rotation speed of the disk (81) has reached a constant rotation speed synchronized with the clock. Rotation speed of 30 O
rpm, index scars are detected at intervals of 200 m5ec. If the ready signal is generated at time 12 in synchronization with the falling edge of the index signal, the next falling edge of the index will be 11 200 m5ec later. The counter (C) is reset by the phototransistor P, and generates a pulse at a cycle of 200 m5ec by the index signal obtained from the phototransistor P.For example, a negative pulse is generated from the NOR gate @180m5ec after the ready signal is generated at time 18, and one light is emitted. Diodes L, ~L, light up. That is, 2 points from the point where the index hole ends passing through the photodetector.
The light emitting diode Ll5Ls lights up from 0m5ec before. Therefore, the light emitting diodes L, .about.L are lit during the period of passage through the index hole (7), and index detection becomes possible.

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

(2) The light emitting diodes L, ~L4, which detect write protection, the presence or absence of a disc, and the front and back sides of the disc, are controlled to emit light based on a clock signal (pulse train) and are lit intermittently, reducing the power consumption of the light emitting diodes. You can.

(Bl index detection light emitting diode L+.

From t, when the motor-on signal is generated, to t, when the ready signal is generated! ! Since it lights up continuously at , and then lights up in synchronization with the index detection signal, it is possible to reliably detect the index while significantly reducing power consumption.

(Since the five light emitting diodes L1 to L are connected in series, it is not necessary to connect a resistor to each light emitting diode L1 to I, IC independently to provide constant current characteristics, reducing power consumption by %. It can be significantly reduced.Also, the control of each light emitting diode L1 to L can be easily controlled by rc.

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

(B) a light emitting diode L1 for index detection;
The other state detection light emitting diodes L, ~L8 are separated, and the first light emitting diode L, ~L is lit at a constant cycle based on a clock signal regardless of the index detection signal, and the index detection light emitting diode L+ is , 4th
The light may be lit using the method shown in the figure.

(bt In the embodiment, five light emitting diodes LI-LH are connected in series and all of them emit light under the same condition, but all of them may not be caused to emit light under the same conditions, but may be caused to emit light independently. It is also possible to intermittently light one or more of the light sources selected from or ~L, and to light the remaining light continuously in the same manner as in the past.

(cl) The light emitting diodes L1 to L may be connected in parallel instead of in series.

(d) There is no problem even if the number of light emitting diodes for detecting the status is increased or decreased. (e) It is also applicable to an original disk device using an optical head.

[Brief explanation 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 of a sensor circuit, and Fig. 4 is a block diagram showing an example of a floppy disk. FIG. 11+...CPU, (21...Control circuit device i31
...70 Tsubi-y isk drive device, (51...Motor on signal supply line, (61...Ready signal supply line, (7)...Clock signal line, (81...
- Floppy disk, (91...disk drive motor, shout...disk drive motor control circuit, aυ...head, a2...stepping motor, a9...sen f times BB, C?71... N0II'-to, @...counter, ■...2 lips, 20 pieces, sir...exclusive O
R gate. L, ~L1...Light emitting diode bP1~P,...Phototransistor. Agent Noriji Takano Procedural Amendment (Voluntary) 1. Display of the case 1982 Patent Application No. 139698 2, Title of the invention Disk drive device 3, Person making the amendment Relationship to the case Applicant 4, Attorney 5, Date of amendment order Initiator 8, Contents of the amendment No. 4 Correct the figure to the attached drawing.

Claims (1)

[Scope of Claims] (11) 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 disposed opposite to the disk. a recording or reproducing head; a feeding mechanism for changing the relative positional relationship between the disk and the head in the cross-track direction; and a 5V voltage for detecting passage of an optically detectable index provided on the disk.
I--arranged light emitting element and light receiving element. an advance completion signal supply circuit that supplies a recording or reproduction operation completion signal indicating that the disk has reached a certain rotational speed; During the period when the motor-on signal is generated but the dusting completion signal is not generated, the light emitting element is caused to emit light continuously, and during the period when the dusting completion signal is generated, the light emitting element and the light receiving element are activated. A disk drive device comprising: a light emission control circuit for causing the light emitting element to emit light intermittently in accordance with a period during which the index passes between the light emitting element and the light emitting element. (21) The disk drive device according to claim 1, wherein the disk is a flexible magnetic disk.