JPS6222268A - Floppy disc device - Google Patents

Abstract

PURPOSE:To attain a data input/output to/from the title device efficiently with out necessitating queuing of a host device while unloading by driving a spindle motor for a prescribed time at loading/unloading of the disc to prevent poor chucking at loading. CONSTITUTION:A one-shot multivibrator circuit 3 drives a spindle motor 8 for a time at disc loading to prevent generation of various errors due to tetrioration of the chucking accuracy. Further, a one-shot multivibrator circuit 4 drives the motor 8 for a time when the disc is unloaded, a period measuring circuit 9 regards it as a steady-state period to send an L signal to a OR gate 10 to set a ready siganl being reset at the unloading of the disc to be set as soon as the disc is loaded gain within a prescribed time. Thus, the queuing until the motor 8 is at a prescribed period is not required to attain efficient data input/output to/from the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a spindle control circuit for a floppy disk drive.

[Conventional technology]

Conventionally, floppy disk drives have a disk insertion detector that controls the on/off of the spindle motor depending on the presence or absence of a disk.When loading a disk, the spindle motor is always rotating to prevent chucking failures. is prevented. Furthermore, when no disk is inserted, the rotation of the spindle motor is stopped (turned off) regardless of a motor-on signal from outside the apparatus (host side).

[Problem that the invention seeks to solve]

However, when a disc is removed from the inserted disc, it is often replaced with another disc. In this case, the disk detector detects that there is no disk, so the spindle motor stops. The device then stops sending out the drive ready signal. When a disk is inserted, the spindle motor starts rotating and sends out a drive ready signal. When this disk is replaced, it is done in a relatively short time. Generally, it takes about 1 second for the spindle motor to start rotating from a stopped state until the ready signal is sent out, and during this time the 70 tsupee disk device cannot be used from outside the device. .

The present invention is intended to solve these problems, and its purpose is to keep the spindle rotating for a certain period of time even after the disk is removed.

[Means for solving problems]

The 70 disk disk device of the present invention is a floppy disk device equipped with a detector that detects whether or not a disk is inserted, and a drive circuit that turns on and off the rotation of a spindle motor, in which the detector detects whether or not a disk is inserted. A 70-tip disk device comprising a control circuit that turns on the drive circuit for a certain period of time when detecting the insertion of a disk and when detecting the insertion of a disk from presence to absence of the disk.

[Effect]

Since the present invention has the above configuration, even if the disk is removed, the spindle motor remains on for a certain period of time, so if the disk is inserted again during this time, the ready signal is turned on, and the device can be immediately disconnected from outside the device. can be used (controlled).

[Examples] Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 shows a spindle motor control circuit for a floppy disk device according to the present invention. Reference numeral 1 denotes an OR gate, into which are input an auto clear signal 2 which is generated only when the power is turned on, and a disk in signal (disk present when low level) output from a detector that detects whether or not a disk is inserted. The output of OR gate 1 is input to AND gate 2 together with the disk-in signal,
Ru. The output of the AND gate 2 is input to the one-shot circuit 3. The one-shot circuit 3 outputs a signal 101 having a certain time width in synchronization with the falling edge of the input signal. Similarly, the one-shot circuit 4 outputs a signal 102 having a certain time width in synchronization with the fall of the input signal. The OR gate 5 receives the disk-in signal and the motor-on signal sent from the host side, and sends an output signal 105 along with signals 101 and 102 to the AND gate 6. AND gate 6 sends an output signal 104 to drive circuit 7 which drives spindle motor 8 . The spindle motor 8 is turned on and off by a signal 104. The spindle motor 8 sends an index signal 105, which is generated once per revolution, to the period measuring circuit 9.

The period measuring circuit 9 measures the period of the index signal 105, and if it is within a certain range, sends a four-level signal to the OR gate 10 together with the disk-in signal. The output of (or game) 10 is sent to the host side as a drive ready signal.

The one-shot circuits 3 and 4 are set to the initial state by the auto clear signal 1, which is generated only when the power is turned on. When the spindle motor 8 is inserted, the spindle motor 8 is turned on for a certain period of time. This is to prevent the disc from being deformed by the drive pin of the spindle motor 8 if the disc is inserted while the spindle motor 8 is not rotating, which may deteriorate the chucking accuracy and cause various errors. It's for a reason. The one-shot circuit 4 controls the drive circuit 7 from the output 102 through the AND gate 6 with a signal that turns on the spindle motor for a certain period of time when the disk is removed from the inserted state, so the spindle motor 8 continues to rotate.

Therefore, the period measuring circuit 9 regards the period as a steady period and continues to send a low level signal to the OR gate 10. Since the disk-in signal of the OR gate 10 becomes high level when the disk is removed, the ready signal is no longer sent. When a disk is removed, the spindle motor is turned on for a certain period of time, but the ready signal is turned off, and when the disk is reinserted within a certain period of time, the ready signal is turned on at the same time as the disk is inserted. When a disk is reinserted within a relatively short period of time, such as when a disk is replaced, a ready signal is sent simultaneously with the reinsertion of the disk to make the device ready for operation. Therefore, there is no need to wait until the spindle motor 8 reaches a constant cycle as in the conventional case. Further, if the spindle motor 8 is not reinserted within a certain time, it is assumed that the operation has ended, and the spindle motor 8 is turned off.

In the embodiment, the one-shot circuit 5.4 is provided, but a configuration in which it is shared can also be adopted. It can also be combined with a drive select signal to operate only the selected device.

〔Effect of the invention〕

As described above, in the present invention, the spindle motor rotates for a certain period of time when inserting and ejecting a disk, which prevents chucking failure when inserting a disk and also prevents the host side from waiting when ejecting a disk. This makes it possible to input and output data to and from devices efficiently.

[Brief explanation of the drawing]

FIG. 1 is a spindle motor control circuit diagram of a floppy disk device of the present invention, and FIG. 2 is a timing chart of the spindle motor control circuit of FIG. 1. 3.4... One-shot circuit 7... Drive circuit 8... Spindle motor or higher

Claims (1)

[Claims] In a floppy disk drive equipped with a detector that detects the presence or absence of a disk insertion, and a drive circuit that turns on and off the rotation of a spindle motor, when the detector detects whether a disk is inserted or not, and when the disk is detected. A floppy disk device comprising a control circuit that turns on the drive circuit for a predetermined period of time when insertion is detected.