JPH0449185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a floppy disk device including:
In particular, the present invention relates to a media protection device that prevents damage to the center hole of the media.

Conventionally, when a floppy disk (including media and jacket) is inserted into a floppy disk device and the front door is closed, if the drive motor for rotating the media is not operating, the center hole of the media may be damaged. I was able to receive something. This occurs because the position of the center hole of the media is misaligned with the position of the clamper that fixes the media to the rotating body. In other words, when the rotating body is not rotating, the position of the center hole of the media and the position of the clamper that fixes the media to the rotating body are misaligned, and the media is pinched, causing damage to the center hole of the media. Ta.

This invention was made in view of the above-mentioned circumstances, and when a floppy disk is inserted into a floppy disk device and the media is clamped with a clamper, the drive motor is rotated so that the media can be fixed smoothly. To provide a media protection device capable of preventing damage to a center hole of a media.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is a floppy disk, and this floppy disk 1 consists of a medium 1a and a jacket 1b for protecting the medium 1a. A floppy disk insertion detector 2 includes a light emitting element 2a and a light receiving element 2b, and has a function of detecting whether or not the floppy disk 1 is inserted. Reference numeral 3 denotes a clamper for fixing the media 1a to the rotating body 4. 5 is a cone, which has the function of pressing down the clamper 4 from the inside. 6 is a DC brushless motor, which has the function of rotating the rotating body 4. 7
An index detector includes a light receiving element 7a and a light receiving element 7b, and has a function of detecting an index hole provided at a predetermined location on the medium 1a. 8 is an OR circuit, and this OR circuit 8
is supplied with a detection signal F1 obtained by amplifying the output of the light receiving element 2b in the floppy disk insertion detector 2, and a control signal MC for forcibly controlling the rotation of the motor 6 on and off.

9 is a speed detector, this speed detector 9
A signal obtained by amplifying the output of the light receiving element 7b of the index detector 7 is supplied to the media 1.
When the rotation speed of a increases sufficiently, a signal SP that becomes high level is output. 10 is an OR circuit, and the OR circuit 10 is supplied with a signal SP and a frequency-divided output signal DP, which will be described later. Reference numeral 11 denotes a flip-flop, and the set terminal of the flip-flop 11 is supplied with the output signal of the OR circuit 8, and the reset terminal thereof is supplied with the output signal of the OR circuit 10. Reference numeral 12 denotes a motor drive circuit, which has a circuit for switching the phase of the DC brushless motor 6 having two or more phases, and includes a flip-flop 11.
The motor 6 is started when the output signal SS rises, and stopped when it falls. Further, from the motor drive circuit 12, the motor 6
It has the function of outputting a clock signal CL with a period corresponding to the rotation of the motor.

Reference numeral 13 denotes a frequency division counter, which is supplied with a clock signal CL, and by dividing this clock signal CL by 128, for example, produces a frequency division output signal for stopping the motor 6 a predetermined time after the motor 6 is started.
It has the ability to output DP. That is, the frequency division counter 13 monitors the rotation time of the motor 6, and is used to stop the rotation of the motor 6 after a predetermined time has elapsed after the motor 6 is started. On the other hand, the speed detector 9 mentioned above
monitors the rotational speed of the floppy disk 1, and stops the rotation of the motor 6 when the rotational speed reaches a preset rotational speed.

Next, the operation of the above embodiment will be explained with reference to the timing chart of FIG.

First, when the floppy disk 1 is inserted from the direction of the arrow ID by the operator, a detection signal F is output from the floppy disk insertion detector 2.
1 is a high level. As a result, the OR circuit 8
The output of the flip-flop becomes high level, and the flip-flop 11 is set. Therefore, the output signal SS of flip-flop 11 becomes high level,
The motor drive circuit 12 starts the motor 6 and outputs a clock signal CL. This clock signal CL has the same waveform as the signal corresponding to any one phase of the motor 6. This clock signal CL is input to a frequency division counter 13 and is successively divided in frequency. In this embodiment, for example, a frequency-divided output signal DP whose frequency is divided by 128 is output.
When this signal DP becomes high level, OR circuit 1
The output of 0 becomes high level, and the flip-flop 11 is reset. Therefore, the signal SS
becomes a low level, and a predetermined time after the motor 6 is started, the motor drive circuit 12 enters control to stop the rotation of the motor 6, and the rotation of the motor 6 is stopped.

In this case, by using a motor 6 that starts rotating quickly, the rotation of the motor 6 is started almost simultaneously with the detection of the floppy disk 1, and the floppy disk 1 is fully inserted as shown in FIG. By the time the motor 6 reaches the required state, the motor 6 has started up to the required rotation speed. That is, cone 5
By the time the center of the media 1a is pressed from above by the clamp 3 and fixed to the rotating body 4, that is, by the time the clamping is completed, the motor 6 has risen to the required rotation speed. In addition,
The time for dividing the frequency by 128 in the frequency division counter 13 is:
The above operation period is set to be sufficiently longer than the time required to complete the clamping.

On the other hand, if the speed detector 9 detects via the index detector 7 that the rotational speed of the media 1a has risen sufficiently before the time of this 128 frequency division has elapsed, the signal SP increases. Since it is set to a high level, the flip-flop 11 is reset and the rotation of the motor 6 is stopped without waiting for the elapse of the time divided by 128.

Therefore, in a magnetic disk device equipped with such a media protection device, when the media is inserted and fixed to the rotating body, the motor that rotates the rotating body has already started up to the required rotation speed.
The position of the center hole of the media and the position of the clamper do not deviate, and damage to the center hole of the media can be prevented.

Furthermore, when the rotation of the media has started up sufficiently, it is assumed that the clamping has finished.
Since the motor stop control is entered without the set time elapsed, the motor can be efficiently stopped without forcing the media to rotate unnecessarily, and thus, for example, wasteful power consumption can be prevented.

Further, for example, if the user forgets to close the front door when inserting a floppy disk, or if the read/write operation is temporarily stopped without closing the front door while the floppy disk is inserted, the motor is in the activated state. At this time, since the present invention is provided with not only a speed detector but also a frequency dividing counter, the motor can be stopped after a predetermined time has elapsed after the motor has been started. Therefore, even if the clamper operation is not completed while the disk is inserted, the motor does not continue to rotate unnecessarily, thereby further preventing wasteful power consumption, for example.

As described in detail above, according to the present invention, since the motor is rotated when the disk is inserted, the media can be fixed smoothly and the center hole of the media can be prevented from being damaged. Furthermore, since the rotation of the motor is controlled to stop based on the rotation time of the motor and the rotation speed of the disk, it is possible to efficiently stop the rotation of the motor not only when normal clamper operation is performed, but also when clamping does not end when the disk is inserted. The motor can be stopped, and therefore, for example, wasteful power consumption can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention;
FIG. 2 is a timing chart for explaining the operation of the same embodiment. 1... Floppy disk, 2... Floppy disk insertion detector, 3... Clamper, 4... Rotating body, 5... Cone, 6... Motor, 7... Index detector, 8, 10... OR circuit, 9...
Speed detector, 11... flip-flop,
12...Motor drive circuit, 13...Counter.

Claims (1)

[Claims] 1. In a floppy disk device, a floppy disk insertion detector detects the insertion of a floppy disk containing a medium, an index detector detects an index hole provided in the medium, and a rotation sensor to which the medium is fixed. a motor that rotates the rotating body; a motor drive circuit that controls the start and stop of the motor and outputs a clock signal according to the rotation period of the motor; and a motor that divides the frequency of the clock signal to drive the motor. a counter that outputs a signal to stop the motor a predetermined time after the motor is started; and a speed that detects that the rotation speed of the media has exceeded a preset rotation speed based on the output signal from the index detector. The motor is started based on a detection signal from a detector and the floppy disk insertion detector, and when at least one of the output signal of the counter and the detection signal from the speed detector is significant, the motor is activated. and logic circuit means for outputting a signal for controlling the motor drive circuit so as to stop the motor drive circuit.