JPH0541020A - Disk driving device - Google Patents

Abstract

PURPOSE:To scrupulously perform power saving for a floppy disk device and to lighten the burden of a power source. CONSTITUTION:A switching transistor 17 is connected to a power source line 18 of a write/read circuit 16. Not only a power source of the write/ read circuit 16 is cut off by switching off the switching transistor 17 during an off-period of a motor 4 for rotating a floppy disk but also the power source of the write/ read circuit 16 is cut off by switching off the switching transistor 17 during a start-up period of the disk rotating motor 4. By this method, the power saving is scrupulously achieved, and the burden of the power source owing to a start-up current of the motor 4 is lightened.

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 and / or reproducing information using a floppy disk (flexible magnetic disk) or a disk similar thereto.

[0002]

2. Description of the Related Art A magnetic disk drive device has a disk rotating mechanism, a magnetic head (transducer), and a head moving mechanism. The head moving mechanism generally includes a stepping motor that responds to a step signal and a rotation-linear conversion mechanism that obtains a linear motion corresponding to the rotational motion of the motor. The head is moved in the disk radial direction (track crossing direction). It is configured to move. By the way, since a device for driving a disk cartridge, generally called a micro floppy disk, in which a flexible magnetic disk having a diameter of 86 mm is housed in a rigid case is extremely small, it is necessary to have a portable structure using a battery power source. You can In the case of such a portable type, it is desirable to configure so as to save power.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk drive device capable of finely achieving power saving and reducing the load on the power source.

[0004]

According to the present invention for achieving the above object, a disk rotating mechanism including a disk rotating motor for rotating a recording medium disk and information conversion based on a relative scanning motion of the disk. A transducer for performing, a head moving mechanism including a stepping motor for moving the transducer in a track crossing direction of the disk in response to a step signal, and a writing / reading circuit of, for example, an embodiment connected to the transducer. 16 and a signal processing circuit, a power on / off control switch, such as the transistor 17 of the embodiment, connected to the power supply line of the signal processing circuit, and the switch at least during a period in which information is converted by the converter. ON control, at least the OFF period of the disk rotation motor, and the drive start of the disk rotation motor. The transition period from a point to point to be normal rotational speed near those related to the disk drive device consisting of a switch control circuit for turning off controlling the switch.

[0005]

According to the above-mentioned invention, at least the switch newly provided is used during the off period of the disk rotation motor and the transitional period from the start of driving the disk rotation motor to the time when the rotation speed is close to the normal rotation speed. Since the power of the signal processing circuit is controlled to be off, fine power saving can be achieved. Further, since the power supply of the signal processing circuit is cut off when the disk rotation motor is started, it is possible to reduce the load of the power supply procedure of the entire disk drive device when the disk rotation motor is started.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a magnetic disk drive device according to an embodiment of the present invention will be described with reference to FIGS. Figure 1
In FIG. 1, 1 is a magnetic disk cartridge generally called a micro floppy disk, which is composed of a disk 2 and a case 3 for accommodating the disk 2. The disk 2 is rotatable within the case 3 and has a metal hub in the center. The disk rotating mechanism is composed of a disk rotating motor 4 and a rotating table 5 coupled to the motor 4, and the rotating table 5
Has a magnet for attracting the hub of the disk 2, a spindle for engaging the hub, and a drive pin. Reference numerals 7 and 8 denote transducers or magnetic heads, which record or reproduce information on the basis of relative scanning motion with the disk 2.
A mechanism for moving the magnetic heads 7 and 8 in the radial direction (track crossing direction) of the disk 2 is an α-wound steel for converting the rotational movement of the head carriage 9, the stepping motor 10, and the stepping motor 10 into a linear movement. It is composed of a rotation-linear conversion mechanism 11 such as a belt or a lead screw, and is configured to move the magnetic heads 7 and 8 by a unit track according to a single step operation or a plurality of step operations of the stepping motor 10.

Reference numeral 12 is a motor control drive circuit, which has a terminal 1
3 is a circuit for driving the disk rotation motor 4 in response to a motor-on signal supplied from the motor 3. Reference numeral 14 denotes a stepping motor control circuit, which is a circuit that distributes the step pulse supplied from the terminal 15 to, for example, a one-phase excitation method and supplies the step pulse to the four-phase stepping motor 10.

A writing / reading circuit 16 is composed of a circuit for processing a writing signal (recording signal) and a circuit for processing a reading signal (reproduction signal). More specifically, the circuit 16 includes a recording system including an amplifier circuit for supplying a current according to write data to the heads 7 and 8, an amplifier circuit for amplifying the outputs of the heads 7 and 8 during reproduction, and a reproduction output. And a reproducing system including a circuit for pulse-shaping the digital waveform into a digital waveform.

A switching transistor 17 is provided for saving power according to the present invention, and is connected in series to a power supply line 18 of a writing / reading circuit 16 as a signal processing circuit. When the transistor 17 is off, the power of the writing / reading circuit 16 is off,
Power saving is achieved. 19 is a switch control circuit,
AND gate 20, NOT circuit 21, transient period signal generation circuit 22, and retrigger monostable multivibrator 2
It consists of three. The first input terminal of the AND gate 20 is connected to the motor-on signal supply terminal 13, the second input terminal is connected to the output of the transient period signal generating circuit 22, and the third input terminal of the retrigger monostable multivibrator 23. Connected to the output. Therefore, when all three inputs are high level, a high level output is obtained from the AND gate 20, which is inverted by the NOT circuit 21 in the next stage and supplied to the base of the transistor 17 to turn on the transistor 17. To be done. The transient period signal generation circuit 22 is a timer, and responds to the motor-on signal supplied from the terminal 13 changing from a low level to a high level for a fixed time (38
0 ms) low level pulse is generated. This fixed time is approximately equal to the transient period until the motor 4 approaches the normal rotation speed in response to the motor ON signal. In this magnetic disk drive device, a signal indicating a ready state based on the fact that the rotation speed of the disk 2 is 90% or more of the normal speed and that a predetermined time of, for example, 420 ms has elapsed since the motor 4 was turned on. Occurs. Therefore, 38 set by the transient period signal generation circuit 22 in this embodiment is set.
Since 0 ms is shorter than 420 ms for ready detection, 38
The end point of 0 ms can be called the pre-ready point.
The retrigger monostable multivibrator 23 has an output pulse width of 8 ms and generates a low level pulse in response to the trailing edge of the step pulse supplied from the terminal 15. Since step pulses are generated at time intervals shorter than 8 ms, when multiple pulses are input, they are re-triggered in the step pulse generation period and continue to generate low level output from the trailing edge of the last pulse to 8 ms. ..

Next, the operation of the apparatus of FIG. 1 will be described with reference to the waveform chart of FIG. When a high level motor-on signal is generated at time t1 as shown in FIG. 2A, this is supplied to the motor control drive circuit 12 to start the rotation of the motor 4 and the rotation of the disk 2. However, the steady speed is not reached immediately. Transient period signal generation circuit 2 composed of a timer
2 is triggered by the rising (edge) of the motor-on signal of FIG. 2 (A) to a high level, and as shown in FIG. 2 (B), t1
A low level transient signal of 380 ms is generated from .about.t2 and returns to the high level output at time t2. The time point t2 is a pre-ready time point, which is a time point when the preparation for recording or reproduction is almost completed. A high level motor-on signal is input to the AND gate 20 during the period from t1 to t2, but since a low level transient period signal is generated, the AND output is at a low level and the transistor 17 is also kept off. ,writing/
The power supply voltage of the read circuit 16 is maintained at zero volt as shown in FIG. At time t2, since the transient period signal becomes high level, the output of the AND gate 20 becomes high level, the transistor 17 is turned on, and FIG.
The power supply voltage is supplied to the write / read circuit 16 as shown in FIG. Therefore, the power consumption of the writing / reading circuit 16 during the start-up period of the disk rotation motor 4 is eliminated, and the load on the power source of the apparatus is reduced by that much.

As shown in FIG. 2C, when the trailing edge of the first step pulse is reached at time t3, the retrigger monostable multivibrator 23 is triggered, and its output is shown in FIG. 2D.
It becomes a low level as shown in. Since the step pulse is input in a cycle shorter than 8 ms, the monostable multivibrator 23 is retriggered during the step driving period from t3 to t4.
Output is kept low, and a fixed time (8 ms) from the trailing edge of the last step pulse to time t5 is kept low. As a result, even if the first and second inputs of the AND gate 20 are at the high level during the period of t3 to t5, the output of the AND gate 20 is at the low level because the third input is at the low level and the transistor 17 is turned off. And power line 18
Is cut off. Even if the step pulse ends at time t4, the movement of the heads 7 and 8 by the carriage 9 is not immediately stable. Therefore, writing or reading by the heads 7 and 8 is started from the time point when about 15 ms has elapsed from t4. Therefore, the power supply voltage of the write / read circuit 16 may be supplied so far. However, considering the rise time of the voltage supply by the transistor 17 and the like, t4 to t4
5 hours is set to about 8 ms. Since all the AND inputs are at the high level during the period from t5 to t6, the transistor 17 is kept on, and when the motor-on signal changes to the low level at the time of t6, the AND output also becomes the low level and the transistor 17 is turned off.

As is apparent from the above, according to this embodiment, the power supply of the write / read circuit 16 is cut off when the motor 4 is started, so that the power supply capacity of the entire magnetic disk drive can be reduced. Therefore, the cost and size of the device can be reduced.

[0013]

MODIFICATION The present invention is not limited to the above-described embodiments, and the following modifications are possible, for example. (A) It is detected that the rotation speed of the motor 4 or the disk 2 reaches a predetermined value (pre-ready state) without configuring the transient period signal generation circuit 22 with a timer, and a high level output is output after the pre-ready state is detected. It may be generated. Further, the transition period from t1 to t2 may be a period until ready detection (for example, a period in which the rotation speed is 420 ms and 90% or more). (B) In FIG. 1, only the writing / reading circuit 16 is connected to the output stage of the transistor 17, but if necessary, another circuit may be connected to control the power on / off at the same time. May be. (C) It is also applicable to an apparatus using a disk cartridge in which a magnetic disk is housed in a flexible jacket and an apparatus using other various recording medium disks. (D) The present invention can also be applied to a write or read-only disk drive device. (E) The monostable multivibrator 23 may be triggered by the leading edge of the step pulse. (F) The transistor 17 may not be turned off during the period from t4 to t5.

[Brief description of drawings]

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

FIG. 2 is a waveform diagram showing states at points A to E in FIG.

[Explanation of symbols]

 1 Magnetic Disk Cartridge 4 Disk Rotating Motor 16 Writing / Reading Circuit (Signal Processing Circuit) 17 Switching Transistor 19 Switch Control Circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Hiraki 3-7-3 Nakamachi, Musashino-shi, Tokyo Teiatsuku Inc. (72) Inventor Tsutomu Morita 3-7-3 Nakamachi, Musashino-shi, Tokyo Tayatsuk Within the corporation

Claims (1)

[Claims] 1. A disk rotating mechanism including a disk rotating motor for rotating a recording medium disk, a converter for converting information based on a relative scanning movement of the disk, and a step signal. A head moving mechanism including a stepping motor for moving the converter in the track crossing direction of the disk, a signal processing circuit connected to the converter, and a power on / off control connected to a power line of the signal processing circuit. And a switch for controlling at least during the period in which information is converted by the converter, at least during the off period of the disk rotation motor and near the normal rotation speed from the start of driving the disk rotation motor. A disk drive device comprising a switch control circuit for turning off the switch until a certain time.