JPS63103467A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To improve the reliability of a device, and to reduce the cost of the device, by outputting an index pulse only when the rotation of a driving motor is rotated normally. CONSTITUTION:A window comparator 15 inputs a signal 14 outputted from a driving control circuit 4, and outputs a signal 16 if it is judged that the motor 6 is rotated normally based on the signal 14. Thereby, a switch 17 is closed by the signal 16, and a voltage from a power unit is introduced to an index sensor 5. When the sensor 5 outputs a detection signal 8 which represents the start point of a recording medium 7, a control part 3 outputs the detection signal 8 as the index pulse 11b according to the logic state of a control signal 10, then, a write and a read operations are started. In such way, it is possible to obtain a magnetic recorder with high reliability and an inexpensive price.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a magnetic recording device.

[Prior Art] FIG. 3 is a block diagram showing a conventional magnetic recording device shown, for example, on page 16 of ``Latest Floppy Disk Devices and Their Application Know-how'' (written by Shoji Takahashi and published by CQ Publishing). In the figure, (1) is a read circuit, (2) is a write circuit, and a control unit (3) receives a signal from a control line (11) to perform a read or write operation.
More controlled. (4) is a drive control circuit, which receives commands from the control unit (3) and drives a motor (6) for driving the medium.
to drive and control. (5) is a detector (hereinafter referred to as an index sensor), which detects the starting point of the circumference of the recording medium (7). In FIG. 4, a magnetic recording device is indicated by the symbol (20), and a recording device controller (9) is connected to the magnetic recording device by a control signal (10).
) and (11). FIG.

Next, the operation will be explained. Index sensor (5
) is first input to the control section (3). As a result, the control section (3) outputs an output signal (llb) controlled by the signal (8) and the control signal (10). At the same time, when it is determined that the rotation is below a certain period based on the detection signal (index signal) (8) detected by the index sensor (5), the control signal is sent to the recording device controller (9) shown in Fig. 4. Control signal to notify (
11) (hereinafter referred to as a ready signal), and is output according to the logic state of the control signal (10). Therefore, the recording device controller (9) receives the ready signal (llc) from the magnetic recording device (20) and the control unit (
3) of the control signals (11) of the detection signal (8) (hereinafter referred to as index pulse), the control signal (10) to the magnetic recording device (20) is output. Determine the start of displacement.

[Problems to be Solved by the Invention] Conventional magnetic recording devices are configured as described above, so even when the rotational speed of the recording medium is abnormally high, writing or reading operations are performed, resulting in errors. There are also some devices that operate only with index pulses without using a ready signal, and if the index pulse is output even at a rotation speed other than the predetermined rotation speed, it will instruct the recording device to perform a write/read operation. There is a problem with this configuration, which may lead to errors.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a highly reliable magnetic recording device that can eliminate the decrease in reliability caused by the above-mentioned problems.

[Means for Solving the Problems] A magnetic recording device according to the present invention detects the starting point of a circumference provided on a disk-shaped recording medium by a signal related to the rotation of the disk-shaped recording medium driven by a motor. The drive of the motor and the writing and reading of the recording medium are controlled by controlling the input of the detection signal of the index sensor.

[Function] The magnetic recording device according to the present invention corresponds to a stable state of the rotation of the recording medium in which a signal related to the rotation of the recording medium is detected, under predetermined conditions.

The operation of the control unit is stabilized by using the detection signal of the index sensor only when it is determined that the rotation of the motor is in a stable state.

[Example code] An embodiment of the present invention will be described below with reference to FIG.

(1) is a readout circuit that outputs a readout signal (lla);
(2) is a control signal (1) consisting of (10a) to (10c).
0), the write circuit (3) inputs the control signal (10
d) to (10h), and control signal (llb) - (l
ie), (4) is a drive control circuit that inputs the signal (13) and outputs a signal (14) obtained by converting it into a voltage frequency, (5) is an index sensor, (6)
) is a motor, and (7) is a recording medium, and each of these elements is the same as the one with the same reference numeral in FIG. 3 already explained in the prior art. Further, (15) is a window comparator, which receives the signal (14) from the drive control circuit (4).
is input, and when it is determined that the motor (6) is rotating normally, the signal (1G) is output (active). (17) is a switch that is turned on when the signal (16) becomes active.

Next, the operation will be explained. The control section (3) receives a control signal (
10), read circuit (1), write circuit (2)
), and the drive control circuit (4). By kneading, the drive control circuit (4) generates a signal (
13) and a signal (14) obtained by converting this into a frequency voltage (F-V).

The window comparator (15) is connected to the drive control circuit (4).
), and based on this it is determined whether the motor (6) is rotating normally. If the motor (6) is rotating normally, the signal (14) is input.
16) is output. For this purpose, the switch (17) is closed by the signal (16) and conducts the voltage from the power supply to the index sensor (5). That is, the index sensor (5) is supplied with driving power from the power supply via the switch (17) only when the motor (6) is rotating normally, and receives a detection signal indicating the starting point of the recording medium (7). (
8) is output.

This detection signal (8) is input to a control section (3), and the control section (3) outputs the detection signal (8) as an index pulse (llb) according to the logic state of the control signal (10). Therefore, as shown in FIG. 4, since the magnetic recording device (20) receives this index pulse (llb), it starts its write and read operations.

In the above embodiment, the operation of the index sensor (5) was controlled by turning on and off the power, but as shown in FIG. A similar effect can also be obtained by providing (18) and introducing it into the control section (3) to control the detection signal (8).

Furthermore, although the above embodiments have been described with respect to a flexible disk device, the same effect can be achieved in a fixed disk device as well.

[Effects of the Invention] As described above, according to the present invention, since the index pulse is configured to be output only when the rotation of the drive motor is normal, a highly reliable device can be obtained at low cost. There are 6

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a magnetic recording device according to one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, FIG. 3 is a block diagram of a conventional magnetic recording device, and FIG. 4 is a block diagram of a data processing device using these magnetic recording devices. In the figure, (3) is the control section, and (5) is the index/control section.
A sensor, (7) a recording medium, (15) a window comparator, (17) a switch, and (18) a gate circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (3)

[Claims] (1) An index sensor for detecting the starting point of the circumference provided on a disc-shaped recording medium driven by a motor is provided, and a signal related to the rotation of the recording medium and a detection signal of the index sensor are input signals. In a magnetic recording device that controls writing and reading of the recording medium, the signal related to the rotation of the recording medium is transmitted to the motor based on a predetermined condition corresponding to a stable state of rotation of the recording medium. a window comparator that outputs a logic signal when determining that the rotation is in a stable state; a switch that activates the index sensor based on the output logic signal of the window comparator; and a switch that activates the index sensor from the recording medium. A magnetic recording device comprising: a control unit that controls driving of the motor and writing and reading of the recording medium using the read signal and the detection signal of the index sensor as input signals. (2) The magnetic recording apparatus according to claim 1, wherein the control section inputs a signal for driving the recording medium as a signal related to rotation of the recording medium. (3) The control section is characterized by inputting the detection signal as a signal related to the rotation of the recording medium via a gate circuit that takes an AND of the signal for driving the recording medium and the detection signal of the index sensor. A magnetic recording device according to claim 1.