JP2001104834A - Rotor life control device for centrifugal separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To demodulate regenerated signals regenerated from a magnetic recording medium to digital information without error while eliminating the demodulation error resulted from the rotational fluctuation of a rotor and the measuring error of the number of revolution. SOLUTION: A control means in which a basic code rate is formed from a pulse period of a rotation signal generator 4 generating the pulse signal resulting from the rotation of the rotor 1, and the distance of the signal of a regenerated binary signal is classified by plural code rates derived from the basic code rate, the 1 and 0 of digital information is decided based on this result and demodulated as the digital information is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifuge rotor life management device for demodulating a reproduction signal reproduced from a magnetic recording medium into digital information without error.

[0002]

2. Description of the Related Art As shown in a signal demodulation time chart shown in FIG. 6, a rotor life management device used in a centrifuge uses a delimiter for demodulating a so-called MFM modulation system reproduced binary signal into digital information. And a signal indicating the head of a data sequence called a head signal a of a reproduced binary signal, a header b following the signal, and a star and a signal c.
The changing point of the star and the signal c is used as a reference point for discriminating window signal generation, and the interval TW between discriminating window signals is an equal interval signal determined based on the rotation signal of the rotor. , The presence / absence of a change in the reproduced binary signal, that is, 1 when there is a change, and 0 when there is no change, is demodulated into digital information.

[0003]

In such a conventional rotor life management apparatus, the discrimination window is increased as the digital information to be reproduced moves away from the star and the signal c due to rotation fluctuation of the rotating rotor or a measurement error of the rotation speed. In some cases, the signal deviates from the virtual breakpoint d, and there is a problem that accurate and stable demodulation of digital information cannot be performed.

An object of the present invention is to solve the above-mentioned problems, to eliminate a demodulation error caused by a fluctuation in the rotation of the rotor and a measurement error of the number of rotations, and to provide a novel apparatus capable of always ensuring accurate and high reliability. .

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to generate a basic code rate from a pulse period of a rotation signal generator for generating a pulse signal accompanying rotation of a rotor, and to generate a plurality of codes derived from the basic code rate. Play by Rate 2
This is achieved by providing control means for classifying the intervals of the signal of the digitized signal, determining whether digital information is 1 or 0 based on the result, and demodulating it as digital information.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present embodiment will be described in detail below with reference to the drawings. In the block circuit diagram shown in FIG. 1 as a specific embodiment, 1 is a rotor for centrifuging a sample, 24 is a crown for mounting the rotor 1 and rotating the rotor 1, and 2 is fixed to the crown 24 to rotate it. The drive shaft 3 is a motor that applies a rotational force to the drive shaft 2, and 4 is a rotation signal generator that generates a pulse signal accompanying the rotation of the rotor 1, in this case, detects the rotation of the crown 24. A perspective state accompanying rotation of the attached magnet 25 is detected by a Hall IC or the like. Reference numeral 5 denotes a rotor adapter mounted on the rotor 1 on the rotating circumference on the bottom surface of the rotor 1. A magnetic recording medium 6 is provided on the surface of the rotor adapter by plating, vapor deposition, or the like. Reference numeral 26 denotes a magnetic head for writing or reproducing data, and reference numeral 26 denotes an imbalance sensor for detecting a shake of the drive shaft 2, that is, an imbalance state of the rotor 1.

Reference numeral 8 denotes a magnetic recording medium 6 via a magnetic head 7.
A recording / reproducing circuit 8 for inputting / outputting a signal for writing / reproducing data to / from a magnetic head 7; a recording / reproducing circuit 8; 7, a switching circuit 18 for switching the connection destination between the output signal of the low-pass filter circuit 10 and the low-pass filter circuit 10, a DC cut circuit 11 for inputting a signal output of the low-pass filter circuit 10 for removing unnecessary noise from the reproduced signal, and a DC cut circuit 11, an AGC circuit 12 having an automatic gain adjustment function for making the signal output substantially constant, a differentiating circuit 13 for differentiating the signal output of the AGC circuit 12, and a differentiating circuit 1
3, a differentiating circuit 15 for differentiating the signal output of the hysteresis comparator circuit 14, and a binarizing comparator circuit 16 for binarizing and comparing the signal output of the differentiating circuit 15. It is composed of

Reference numeral 17 denotes a control means for inputting the signal output of the binarization comparator circuit 16 via a line 16a, further inputting the signal output of the rotation signal generator 4 via a line 4a, A signal output of the circuit 16 is input, a recording signal is output to the write amplifier 9 via the line 9a, and switching of the connection destination of the magnetic head 7 of the switching circuit 18 is controlled via the line 18a. 1
Numeral 9 denotes a driver 19 of the motor 3, and a control means 17 controls the number of rotations of the motor 3 via a line 19a. From the imbalance sensor 26, the vibration of the drive shaft 2, that is, the magnitude of the vibration of the rotor adapter 5 is input to the control means 17 via the line 26 a and becomes a signal input for preventing reading and writing under the imbalance state. I have.

The magnetic head 7 is capable of moving forward and backward with respect to the rotor adapter 5. When reading / writing data from / to the magnetic recording medium 6, the magnetic head 7 receives a command from a control means 17 via a line 7a. 7 is positioned so that an appropriate air gap is formed between the tip of the magnetic recording medium 6 and the magnetic recording medium 6.

In the present embodiment, the control means 17 is a so-called multi-function microcomputer, and stores a program for executing processing in accordance with a predetermined procedure.
OM 22, RAM 23 serving as a memory for storing data,
It comprises a timer 20 for measuring the time interval between pulses of the signal output of the binarization comparator circuit 16, a timer 21 for measuring the period of the pulse signal output of the rotation signal generator 4, and the like.

The operation according to the above configuration is described below with reference to the demodulation time chart of the reproduced signal shown in FIG. 2, the processing flow of the control means 17 shown in FIG. 3, the data and processing state stored in the RAM 23 shown in FIG. 4, and the pulse shown in FIG. This will be described with reference to the width classification number line. In FIGS. 1 to 6, those having the same functions are given the same numbers and symbols.

In FIG. 3, a process 101 is a process for controlling and maintaining the rotational speed of the motor 3 at, for example, 1000 revolutions per minute in order to keep the rotor 1 at a predetermined rotational speed in preparation for recording reproduction. The connection of the switching circuit 18 is set so that the signal output of the magnetic head 7 is input to the low-pass filter circuit 10.
Is brought close to the magnetic recording medium 6 to secure an air gap suitable for reproduction during this time. In step 104, when the output voltage of the imbalance sensor 26 is lower than a predetermined value and the rotor 1
That is, it is a process of confirming that the rotor adapter 5 is not in an imbalanced state and determining that there is no problem in reproducing the information written on the magnetic recording medium 6 by the magnetic head 7. The processing 105 is a storage start address for sequentially storing, in the RAM 23, the result of measuring the interval of the pulse signal of the binary comparator circuit 16 obtained by performing the waveform conversion processing of the signal output of the magnetic head 7 by the recording / reproducing circuit 8 by the timer 20. The process 106 is a process for measuring the number of rotations of the rotor 1 during recording and reproduction by measuring the pulse interval of the rotation signal generator 4 with the timer 21.

A process 107 is a process for taking in the reproduction data of the magnetic recording medium 6 and storing the data in the RAM 23. As shown in FIG. 2, the signal output 200 of the AGC circuit 12 is differentiated by the differentiating circuit 13 into a waveform 201. A pulse indicated by 202 is input to the control means 17 from the value comparator circuit 16 via the line 16a. The peak point of the signal 200 crosses the 0V of the signal output 201 with a slight delay, and the pulse 202 is output in synchronization with the timing of crossing the 0V. The pulse interval is measured by the timer 20, and the result is sequentially stored in the memory address as the timer value of the timer 20, as shown in FIG. Therefore, it is a process of measuring and storing data of approximately twice the number of data.

The process 108 is a process for calculating the Tw signal width which is the time width of the virtual delimiter d. If the rotational speed of the rotor 1 at the time of recording / reproduction measured in the process 106 is, for example, 1050 revolutions per minute, Tw = 60 This is a process for calculating Tw such that ÷ (1050 × 134) sec = 426.4 μsec.

The calculation of the basic code rate in the process 109 is as follows.
In the case of the MFM modulation method, the width of the reproduced pulse 202 is 1.0T
Since w, 1.5Tw, and 2.0Tw are fundamental, in order to classify and specify these pulse widths, as shown in FIG. 5, (I) 2.0Tw is 1.75Tw or more and less than 2.5Tw (II) 1.5Tw is 1.25Tw Tw or more and less than 1.75Tw (III) 1.0Tw is 0.875Tw or more and less than 1.25Tw (IV) 0.75Tw is the range of each (I) to (IV) for classifying into four sizes of 0.5Tw or more and less than 0.875Tw It is a process of calculating, for example, 2.0 Tw of (I) is Tw = 4 in this case
Since it is 26.4 μsec, it is 746.2 μsec or more and less than 1066 μsec.

The process 110 is performed in the reproduction binary signal 20 shown in FIG.
3 is a header search process for searching for the head position of the digital information 205 following the start signal c of No. 3, and is written three consecutive times at 0.75 Tw from the timer 20 timer value sequence stored in the RAM 23 according to the above basic code rate. This is a process for specifying the positions of the headers b1, b2, and b3. A process 111 is a process for generating a reproduction binarized signal 203, and the timer 2 following the start signal c (n + 4 of the memory address in FIG. 4) in accordance with the basic code rate.
This is a process of classifying into three pulse widths of 1.0 Tw, 1.5 Tw and 2.0 Tw from the 0 timer value.

A process 112 is a digital information generating process for generating digital information 205 from the reproduced binarized signals classified into three types of 1.0 Tw, 1.5 Tw and 2.0 Tw shown in FIG. If the reproduced binarized signal 203 is inverted at a virtual break point having a width of 1.0 Tw, which is shown in synchronization with the above, it is classified into the above three types of pulse widths, such as "1", otherwise "0". Digital information 205 is generated by a combination before and after the pulse train. Processing 113 is processing 11
This is a process of checking the authenticity of the reproduced information from the information part of the digital information reproduced in step 2 and the information of the sum check part. In the case of false, it is of course possible to perform the retry process again from the process 101.

As described above, in the magnetic recording medium 6 of the rotor adapter 5, the information of the rotor 1, for example, the rotor type, serial number, the number of times the rotor has been operated, the accumulated operating time, and the like, and the above-mentioned sum check are stored in advance. Since the data is written with a predetermined number of bits, Tw, which is the time width of the virtual delimiter d, can be determined from the number of rotations of the rotor 1 when reproducing data from the magnetic recording medium 6, and the data is classified according to the basic code rate. According to the method, even if there is some reproduction error in the pulse interval of the pulse 202 train, there is no accumulation of errors and the pulse 202 far from the star and the signal c can be reproduced accurately and with high reliability.

In this embodiment, two pieces of the same information of the above-mentioned rotor type and one set are written on one circumference of the magnetic recording medium 6 for one half circumference. It is checked whether they match, and the reliability of the determination of the true state of the reproduced data is improved.

On the other hand, when data is recorded on the magnetic recording medium 6, the processing flow of the control means 17 is executed in substantially the reverse order, and the digital information to be written is converted into the write binary data corresponding to the reproduced binary signal. A signal is generated, and the timer value of the timer 20 is stored in the RAM from the measurement result of the rotation speed of the rotor 1 at the time of writing.
23, the connection of the switching circuit 18 is switched to the connection between the write amplifier 9 and the magnetic head 7. If a signal is output from the line 9a, the write current of the magnetic head 7 is sequentially inverted according to the time interval of the above timer value. It is clear from the idea of the present invention that accurate writing can be performed.

[0021]

According to the present invention, a basic code rate is generated from a pulse period of a rotation signal generator for generating a pulse signal accompanying rotation of a rotor, and a plurality of code rates derived from the basic code rate are used. Control means for classifying the intervals of the reproduced binary signal, determining whether digital information is 1 or 0 based on the result, and demodulating the digital information as demodulated information is provided. It is possible to eliminate demodulation errors that occur and always ensure accurate and high reliability.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram according to the present invention.

FIG. 2 is a demodulation time chart of a reproduction signal according to the present invention.

FIG. 3 is a processing flow of a control unit according to the present invention.

FIG. 4 shows data stored in a RAM and a processing state according to the present invention.

FIG. 5 is a pulse width classification number straight line according to the present invention.

FIG. 6 is a demodulation time chart of a reproduction signal according to a conventional technique.

[Explanation of symbols]

1 is a rotor, 2 is a drive shaft, 3 is a motor, 4 is a rotation signal generator, 6 is a magnetic recording medium, 7 is a magnetic head,
8 is a gain adjusting means, and 17 is a control means.

Continuing from the front page (72) Inventor Takahiro Fujimaki 1060 Takeda, Hitachinaka-shi, Ibaraki Prefecture Inside Hitachi Koki Co., Ltd. (72) Inventor Tetsushu Numata 1060 Takeda, Hitachinaka-shi, Ibaraki Prefecture F-term in Hitachi Koki Co., Ltd. (Reference) 4D057 AC01 AC05 AD01 AE11 BA21 CA00 CB00

Claims (1)

[Claims] 1. A rotor for centrifuging a sample, a drive shaft for rotating the rotor, a motor for applying a rotational force to the drive shaft, a rotation signal generator for generating a pulse signal accompanying the rotation of the rotor, A magnetic recording medium provided on the rotating circumference of the rotor, a magnetic head for writing and reproducing data on the magnetic recording medium, and inputting and outputting signals for writing and reproducing data on the magnetic recording medium with respect to the magnetic head And a recording / reproducing circuit, wherein a basic code rate is generated using a cycle of a pulse signal output from the rotation signal generator as a reference signal, and a plurality of code rates derived from the basic code rate are used. And a control means for demodulating a reproduced signal output from the recording / reproducing circuit into digital information. Life management device.