JPS6273457A - Floppy disk device - Google Patents

Abstract

PURPOSE:To prevent a fault at catching of a floppy disk in the state of rising characteristic delay of an external input power supply or of power interruption by using the 2nd power supply as an input power supply of a spindle motor drive controlling circuit. CONSTITUTION:The 2nd power supply 2 functioning as a power supply source is provided in addition to an external input power supply 1 and a changeover circuit 3 selecting either the external input power supply 1 or the 2nd power supply 2 is provided. The 2nd power supply 2 is selected by the changeover circuit 3 at the start of drive of a floppy disk device and a spindle 7 and a collet assembly 2 are driven via a spindle motor drive circuit 4 and a spindle motor 8 by the 2nd power supply 2. Thus, the collet assembly 5 catches a floppy disk 6 while being driven and set to a floppy disk face of the spindle 7. When the catching operation is finished, the changeover circuit 3 disconnects the 2nd power supply 2 to select the external input power supply 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floppy disk device, and particularly to drive control of a spindle motor.

[Conventional technology]

A conventional floppy disk is shown in FIG. In the same figure, 1
4 is an external input power source; 4 is a spindle motor drive circuit that controls the rotation of a spindle motor 8, which will be described later; 5 is a collet assembly; 6 is a floppy disk that is a data recording medium; 7 is a spindle; 8#-i floppy disk 6
This is a spindle motor that rotates the motor via a spindle 7.

Therefore, in order to set the floppy disk 6 on the spindle 7, first, the spindle motor drive circuit 4 is turned on by external human power ttal, thereby causing the spindle motor 8 to rotate. Therefore, the spindle 7 and the collet assembly 5 rotate integrally, and the collet assembly 5 catches the floppy disk 6 and sets it on the floppy disk surface of the spindle 7. In this case, the external input [source 1
Originally, the floppy disk device is driven by the main body of the floppy disk device, and as part of the system, the spindle motor drive circuit 4
was driving.

[Problems to be solved]

However, in the conventional example, as described above, the input power to the spindle motor drive circuit 4 depends only on the external human-powered electric power TML, so when the power to the floppy disk drive main body is cut off, the external input power is immediately turned off. When 5X1 is disconnected, VcFi
The rotation of the spindle 7 is in a stopped state. Therefore, since the collet assembly 5 required for catching the floppy disk 6 does not rotate, the floppy disk 6
There is a problem in that failures are likely to occur when catching.

Solution to Problem c] The present invention solves the above problems, and includes a spindle for rotating a floppy disk, and a collet assembly disposed coaxially with the spindle to catch the floppy disk and set it on the spindle. a floppy disk drive comprising: a spindle motor drive circuit that drives a spindle motor that rotates the spindle; and an external input power supply that supplies power to the drive circuit, the floppy disk device comprising a second power supply separate from the external input power supply. and the external input power source and a second source are connected to the spindle motor drive circuit through a switching circuit, and when the spindle starts rotating, the second power source is connected! # is supplied, and after the floppy disk is caught and set, a stain source is supplied using the external 1 as a source.

〔Example〕

Next, an example thereof will be explained with reference to FIG.

FIG. 1 is a schematic configuration diagram of an embodiment of a floppy disk device according to the present invention. In the figure, the same parts as in FIG. 2 are given the same reference numerals.

In FIG. 1, compared to the conventional example, this embodiment has an external human power IC.
A second power supply 2 is provided as a different 1t11ii supply source in addition to 11g1, and an external input power supply l and a second power supply i1!2 are provided.
The difference is that a switching circuit 3 for selecting one of the two is provided.

Next, the operation will be explained. At the start of driving the floppy disk device, the second ring ri2 is selected by the switching circuit 3, and the second ring ri2 is activated by the second power source 2 via the spindle motor drive circuit 4 and the spindle motor 8 in the same manner as in the conventional example described above. 7 and collet assembly 5 are rotationally driven.

Therefore, the collet assembly 5 catches the floppy disk 6 while rotating and sets it on the floppy disk surface of the spindle 7. When the catching operation is completed, the switching circuit 3 disconnects the second power source 2 and selects the external input power source 1. Therefore, from now on, the spindle motor 8 receives power from the external input power source 1 and is driven to rotate the spindle 7.

〔Effect of the invention〕

As explained above, the present invention uses the second power source as the input power source of the spindle motor drive control circuit of the floppy disk device, thereby making it possible to reliably drive the spindle motor when catching a floppy disk. This has the effect that it is possible to prevent a delay in the start-up characteristics of an external input power source and a failure when catching a floppy disk in a power-off state, and to obtain higher reliability regarding the floppy disk.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of a floppy disk device according to the present invention, and FIG. 2 is a schematic diagram of a conventional floppy disk device. 1...External input power supply 2...Second power supply 3...
Switching circuit 4...Spindle motor drive circuit 5.-
・Collet assembly 6...Floppy disk 7...
・Spindle 8...Spindle motor agent Patent attorney Mura 1) Stem separation Figure 1 Figure 2

Claims (1)

[Claims] a spindle for rotating a floppy disk; a collet assembly disposed coaxially with the spindle for catching and setting the floppy disk on the spindle; a spindle motor drive circuit for driving a spindle motor for rotating the spindle; A floppy disk device having an external input power source for supplying power to a circuit, wherein a second power source is provided separately in addition to the external input power source, and the external input power source and the second power source are connected to the spindle motor through a switching circuit. A floppy disk connected to a drive circuit, configured to supply power from the second power source when the spindle starts rotating, and to supply power from the external power source after the floppy disk is caught and set. Device.