JPS62208479A - Floppy disk device - Google Patents

Abstract

PURPOSE:To reduce power consumption by providing a function which receives a motor start signal, transmits the signal to a step motor according to a preset sequence and returns a magnetic head to a reference position. CONSTITUTION:If the current position of the magnetic head is not a reference once, it is recognized to be outer than the reference position. If it is outer, the number of any preset pulses are transmitted to move the magnetic head inside the reference position. If the current position is inner, one pulse is transmitted to move the magnetic head outside. By repeating such recognition and transmission of pulses, the magnetic head can be returned to the reference position. Thus the function which causes a magnetic head drive part 2 to receive the motor start signal Son, to transmit the signal to a step motor STM 21 according to the preset sequence and to return the magnetic head to the reference position is added, whereby the drive power source of the STM can be cut at the time of standing by an input signal, and power that the STM consumes can be reduced.

Description

[Detailed Description of the Invention] [Summary] When the power to the step motor is cut off, the position of the magnetic head may shift. Therefore, a means for automatically positioning the magnetic head at the reference position when the power is turned on again is provided, and the power is turned off while waiting for an input signal, thereby reducing power consumption and energy consumption.

[Industrial application field]

The present invention relates to a floppy disk device, and more particularly to a motor control method that makes it possible to reduce power consumption.

Floppy disk devices using flexible storage media have the advantages of having a large storage capacity, being small and inexpensive, and being easy to handle and maintenance-free.
Its applications are expanding not only to conventional information processing devices, but also to personal computers and word processors used in general households, and along with this, it is desired to realize floppy disk devices that consume less power and are easier to handle. .

[Conventional technology]

FIG. 3 is a block diagram showing a motor drive circuit in a conventional device.

A floppy disk device consists of a data processing unit and a floppy disk drive (referred to as FDD), and the FDD includes a storage medium drive unit 1 that rotates the storage medium as shown in the figure.
, a magnetic head drive section 2 for moving the magnetic head, and a control section 3 for controlling these drive sections in accordance with signals from a data processing section.

The storage medium drive section 1 is composed of a spindle motor (referred to as SPM) 11 and a switching circuit 12 inserted into the power supply circuit of S)'Mll. Closed by the signal Son and opened by the motor stop signal Sof. That is, when writing or reading information, the switching circuit 12 is closed and the S P Ml
1 is rotated, and when waiting for an input signal, the opening/closing circuit 12 is opened to stop the rotation of the SPMII.

On the other hand, the magnetic head drive unit 2 is composed of a step motor (referred to as STM) 21 and an STM control circuit 22 that inputs a signal to a control terminal of 37M21 (not shown). A driving power is applied to the terminal. The control section 3 is connected to the STM control circuit 22.
When the head movement signal Shd is inputted from the head movement signal Shd, the STM 21 rotates according to the number of pulses of the head movement signal Shd to move the magnetic head.

If the drive power applied to the drive terminal of the 37M21 in the magnetic head drive unit 2 is cut off, the position of the magnetic head may change before and after the power is turned on again, and when waiting for an input signal, etc. MoSTM21
The driving power is always applied.

Note that the head sensor 23 is a sensor for detecting the reference position of the magnetic head, and when the drive power is turned on, a head movement signal Shd is input to the STM control circuit 22 via the control unit 3, and the output position of the head sensor 23 is Initialization is performed by rotating the 37M21 until the signal indicates the reference position of the magnetic head to return the magnetic head to the reference position.

[Problem that the invention seeks to solve]

Conventional devices aim to reduce power consumption by applying driving power to the SPM when writing or reading information, and cutting it off when waiting for an input signal. However, S
The problem is that the driving power for the TM is always applied even when waiting for an input signal, and the power consumed by the STM is not reduced.

[Means for solving problems]

FIG. 1 is a block diagram showing one embodiment of the present invention. The same objects are represented by the same symbols throughout the figures.

The problem mentioned above is that the power supply of SPMII and the power supply of 37M21 are disconnected by the motor stop signal Sof and turned on by the motor start signal Son, and
This problem is solved by the floppy disk device of the present invention, which has a function of receiving n and sending a signal to the 37M21 according to a preset value to return the magnetic head to the reference position.

[Effect]

In FIG.
By adding a function to send a signal to the magnetic head and return the magnetic head to the reference position, it becomes possible to cut off the STM drive power when waiting for an input signal, reducing the power consumed by the STM. be able to.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Note that FIG. 2 is a flowchart showing the procedure for sending a signal to the STM.

In FIG. 1, the magnetic head drive section 2 includes an opening/closing circuit 24 that cuts off the drive power of S1'M21 in response to a motor stop signal Sof and turns it on in response to a motor start signal Son. The STM control circuit 25, which inputs signals to the control terminal of the STM 21 (not shown), has a function of rotating the 37M21 in response to the head movement signal Shd input from the control unit 3, and also inputs a motor start signal Son. After receiving the message, send a signal to 37M21 according to the preset procedure, and
A function is added to rotate the 7M21 to return the magnetic head to the reference position.

The STM control circuit 25 is composed of a micro combinator, and upon receiving the motor starting signal Son, returns the magnetic head to the reference position according to the procedure shown in FIG. 1! I] After Tfi recognizes that the SPMII has been started by the motor start signal Son, the current position of the magnetic head detected by the head sensor 23 is checked, and if the current position of the magnetic head is the reference position, initialization is completed immediately. Send a signal.

Also, if the current position of the magnetic head is not at the reference position, it is checked whether it is outside or inside the reference position, and if it is outside, it sends out an arbitrary number of pulses set in advance to move the magnetic head to the reference position. move it inside. If it is inside, one pulse is sent out to move the magnetic head outside. By repeating such confirmation and pulse sending, the magnetic head can be returned to the reference position.

In this way, the motor starting signal Son is sent to the magnetic head drive unit 2.
By adding a function that sends a signal to the 87M21 according to a preset procedure and returns the magnetic head to the reference position, it is possible to turn off the STM drive power when waiting for an input signal, etc. Therefore, the power consumed by STM can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a floppy disk device that consumes less power and is easy to handle.

4. What about the drawings? l? Brief explanation: Figure 1 is a block diagram showing an embodiment of the present invention, Figure 2 is a flowchart showing the procedure for sending signals to the STM, and Figure 3 is a block diagram showing a motor drive circuit in a conventional device. Figure, is. In the figure, l is a storage medium drive unit, 2 is a magnetic head drive unit, 3 is a control unit, 11 is a spindle motor, 12.24 is an opening/closing circuit, 21 is a step motor, 23 is a head sensor, 25 is an STM control circuit, and Son represents a motor start signal, Sof represents a motor stop signal, respectively.

Claims (1)

[Claims] A power source for a spindle motor (11) that rotates a storage medium, and a step motor (21) that moves a magnetic head.
The function is to disconnect the power supply by a motor stop signal and turn it on by a motor start signal, and upon receiving the motor start signal, send a signal to the step motor (21) according to a preset procedure to move the magnetic head to the reference position. A floppy disk device characterized in that it has a function of restoring the floppy disk.