JPS60163211A - Magnetic information recording device - Google Patents

Abstract

PURPOSE:To suppress power consumption by arranging interrupting means of power supply to reading and writing amplifiers between these amplifiers and power supply means for these amplifiers and controlling the interrupting means in accordance with reading processing or writing processing. CONSTITUTION:A magnetic head 1 for write, read and erase operations is connected to the reading amplifier 5a and the writing amplifier 5 and then connected to a CPV 8 through reading amplifier and writing amplifier power supply switches 5c, 5b and a logic circuit 7. The writing processing or reading processing is detected through a photocoupler for detecting the position of the magnetic head in a photosensor means and an index photocoupler, a signal is sent to the logic circuit 7 and power supply to the writing amplifier 5 or the reading amplifier 5a is stopped through the switches 5b, 5c, so that useless power consumption by the amplifiers 5, 5a is suppressed.

Description

Detailed Description of the Invention [Technical Field 1] The present invention relates to a read amplifier that amplifies the information signal read from a magnetic recording medium by a magnetic head, and amplifies the information signal invited and the erase signal when writing the signal. Is it okay to use a writing amplifier? The present invention relates to a magnetic information recording device.

[Prior Art] In general, this type of magnetic information recording device includes an amplifier for writing and reading information connected to a magnetic head, and supplies power to these amplifiers to perform aging, erasing, and reading processing. It is carried out.

However, conventionally, power has always been supplied to both the read amplifier and the write amplifier. For this reason, power to the read amplifier during writing and erasing, and power to the write amplifier during read, are completely meaninglessly consumed, which is uneconomical.

[Objective] An object of the present invention is to provide a magnetic information recording device with low power consumption, which eliminates the above-mentioned conventional difficulties and suppresses wasteful power consumption in the reading amplifier and the writing amplifier.

[Solution Means] The present invention provides a cutoff means for cutting off the power supply from the power supply means to each amplifier between the read amplifier and write amplifier and the power supply means for supplying power to these amplifiers. , depending on whether the read process or the read process is in progress. It attempts to control MIvi means.

[Example] Below! ! An embodiment in which the present invention is applied to a dry battery-driven magnetic recording device will be described with reference to FIGS. 1 to 14.

In FIG. 1, a magnetic head 1 that is housed in a cartridge and writes, reads, and erases data on a magnetic disk by the FM recording method, that is, writes, reads, and erases, as shown in FIG.
It is connected to a write amplifier 5 that controls the current flowing to the coil 3.4 wound around the magnetic head 1, and a read amplifier 5a that amplifies the signal read from the magnetic head 1. Also,
The write amplifier 5 and the read amplifier 5a are the magnetic recording device 6
It is connected to a central processing unit (hereinafter referred to as cPU) 8 via a logic circuit 7 that exchanges logic signals with each part of the CPU. The carriage 9, on which the magnetic head 1 is attached, is moved to a desired position on the magnetic disk via a lead screw 10b by a carriage pulse motor 10 which rotates in accordance with the number of input pulse signals. The carriage pulse motor 10 and the disk motor 11 that rotates the magnetic disk are driven by a motor driver 12, and the motor driver 12 is connected to the CPU 8 via a logic circuit 7. In addition, the magnetic head 1 mounted on the carriage 9 is used for an index, that is, for detecting whether or not the data on the rack 1 of the magnetic disk is at a delimiting position where data starts.
is the outermost track position of the magnetic disk, that is, 1
A photo sensor mechanism 13 for detecting the position of the magnetic head 1, which detects whether the magnetic head 1 is located at rack 0, and a write protector mechanism 13, which detects a write-protection tab installed on a cartridge in which a magnetic disk is stored. 1~1jJH41
3a is connected to the CPU 8 via a thick circuit 7. If the write protection tab is set to prevent accidental erasure of data written on the magnetic disk, the write protect circuit 13a detects this and sends a signal ["] to the thick circuit 7. It is configured to output to.

In addition, the photosensor mechanism 13 and the light prochikku 1-8
A photo sensor (no power switch 131) and a light 1 to protect power switch 13G are connected between the first structure 13a and the logic circuit 7, and similarly,
A write amplifier power switch 5b and a read amplifier power switch 5C are connected between the write amplifier 5 and read amplifier 5a and the logic circuit 7, respectively.

Also, a ROM in which programs for each process are written.
(read-only memory) 14, a seek counter 15a that stores the number of times the magnetic head 1 is set to track O of the magnetic disk for error checking, a read counter 15b that stores the number of times data is read from the magnetic disk, and a pulse motor for the carriage. Feed amount buffer '15 stores the data of the feed amount of 15 CN Excitation buffer 15 d1 stores the data of the excitation phase of the pulse motor for the carriage 1 Buffer 1 etc. that temporarily stores the data /j
The RA'M 15 for easy working is connected to the CPU 8. Further, an interface 16 for exchanging signals between an external host device and the magnetic recording device 6 is connected to the CPU, and the host IX! Computer 1 as a device
7 is also connected.

In FIG. 2, two filters 3.4 wound in the same direction around the ferrite yoke 2 have three terminals 18, 19.
．． 20 are provided. When writing, that is, writing data to a magnetic disk, current is passed from terminal 18 to terminal 19, and current is passed from terminal 20 to terminal 1.
The structure is such that the current is selectively applied to the magnetic disk for each length according to the data to be written.
It is now possible to insert signals with different magnetization directions. Further, when reading, that is, reading data written on the magnetic disk, one continuous coil is connected from the terminal 18 to the terminal 20, and the signals on the magnetic disk are read out in a two-channel configuration. Furthermore, erasing, that is, erasing data written on the magnetic disk, is configured such that direct current magnetization is performed only in the direction of magnetization at the end of the last write. Then, magnetization is performed in the gap 21 between the yoke 2 and the yoke 2a,
These two yokes 2.2a are connected by a backper 22 so that the magnetic flux is continuous, and sliders 23 made of barium titanate are provided on both sides of the yoke 2.2a at the contact surface with the magnetic disk. ing.

In FIG. 3, a rotating body 25 is fixed to a spindle 24 driven by a disk motor 11. As shown in FIG. A wide first slit 26 is formed on the side surface 25a of the rotating body 25, and a second narrower slit 26 is located at a position shifted by 180 degrees.
The slits 27 are numbered. In addition to the central shaft hole, a chucking hole 24b is provided in the core bar 24a of the magnetic disk, and a chucking bottle 24c that rotates in synchronization with the spindle 24 is inserted therein.

The magnetic disk is given rotational force by the chucking bin 24c and is pressed in the outer circumferential direction for accurate positioning, and is always set in the same positional relationship as the slits 26 and 27 of the rotary body 25, so that the slits 26 are placed on the same track. The slit 27 corresponds to the hard sector with the smaller hard sector number, and the slit 27 corresponds to the hard sector with the larger number. An indexing photocoupler 28 consisting of a light emitting diode 28a as a light emitting element and a phototransistor 28b as a light receiving element is attached to the side surface 2 of the rotating body 25.
5a, different signals are output when the first slit 26 and the slit 27 of ff12, which have different widths, pass through, and by detecting this, the rotational position of the magnetic disk, i.e. The configuration allows the user to know the index position. Here, two slits 26 having different widths are formed on the side surface 25a of the rotating body 25.
．． 27 is placed at a position shifted by 180°.The reason why each track of the magnetic disk is set at a position shifted by 180 degrees is that each track of the magnetic disk is
This is because each of the rack numbers 1 to 1 is composed of two hard sectors divided into individual hard sectors, so it is necessary to detect the two index positions separately.

In FIG. 4, a circle 29 centered on the spindle 24 indicates the position of the outer periphery of the magnetic disk.

The carriage 9 on which the magnetic head 1 is mounted is guided at both ends by two guide bars 30, 31 fixed to the body. Further, the presser bar 9a, which has one end fixed to the +17 rod 9, meshes with the teeth of a lead screw 10b mounted on the rotating shaft of the Kittredge pulse motor 10 supported by the motor guide 10a. Therefore, the carriage 9 moves while being guided by the guide bars 30, 31 by the rotation of the carriage pulse motor 10, and the magnetic head 1
The structure is such that it can move by 40 tracks from the outermost position of rack 1 to rack O of the magnetic disk to the innermost position of track 39 shown by the two-dot chain line in the figure. The magnetic disk is placed above the magnetic head 1 with its center aligned with the spindle 24, and is further pressed against the magnetic head by a pad (not shown) from above. Also,
The carriage 9 is provided with protrusions 32 for detecting tracks 1 to 0 (J3). When the magnetic head 1 is located at track 0 of the magnetic disk, a position detecting photocoupler 33 consisting of a light emitting diode 33a and a phototransistor 33b is provided. The configuration is such that a poly-signal is output from the position detecting (position detecting) A toggle 33 indicating that the magnetic head 1 is located on track O.

FIG. 5(a) shows a recording format on a magnetic disk. P is 0.0.0 in the pre-part. ... is expressed as a series of 0 Shintan, and the next S is the start mark o, o, o, i,
It is represented by o, o, o, o.

The length of the hard sector is written in the next HL, and the next HL is written with the length of the hard sector.
-IN is written with a hard sector number.

In this embodiment, each of the 40 tracks is divided into two hard sectors, so there are 80 hard sector numbers in total. In the structure of the hard sector number, the lower 1 bit indicates the distinction between two hard sectors on the same track, and the remaining bits indicate 1 to rack. The next LL is a logical sector length code, and a desired logical sector length code 1 from 0 to 6 can be written. Logical sector L is 1+, I-2,...Lp with pi1~number corresponding to this logical sector length code LL.
.

. . , Ln are equally divided and specified from an external host device such as the combi coater 17, and data is written to a desired logical sector Lp. The number of bytes corresponding to each logical sector length code LL is the logical sector length code L.
64° 80.128, 256, 5 in order from the smallest L
12.1024.1280, logical sector L
The total length of is 12 if it is divisible by each number of bytes.
The length is determined by designating the logical sector length code LL so that it is divisible by each number of bytes, such as 80 bytes, or 1024 bytes if it is not divisible. Therefore, the relationship between the length of one logical sector LD equally divided into each logical sector length code LL1, the entire length of the logical sector L, and the number of divisions n is as shown in the table of FIG. 5(E). In this embodiment, the entire length of the logical sector L is set to be divisible by the length of the equally divided logical sector Lp, but if the remaining portion is made into an inaccessible area, the length of the logical sector L is not necessarily divisible. It is not necessary to set the total length to be divisible by the length of the logical sector Lp which is equally divided. The next R is a reserve, which is an area where Needy can freely write data such as file names and whether or not data can be deleted.
If the judgment is made by an external host device such as 7,
This is great for increasing the efficiency of file organization.

The next IC has an ID field, namely 1-(L to R
CRC (Cyclic Redunda) of data up to
ncyChcck) This is an area where data is written.

Next, DC is the data field, t, which is the logical sector L
This is an area where CRC data regarding the data is written. The next E is the post section, which is represented by an enumeration of zeros similar to the pre section.

Next, the configuration of the excitation circuit of the carriage pulse motor 10 will be explained.

As shown in FIG. 6, the excitation coil L1.12 has two circuits Ci1.12 having the same configuration. Each is independently excited by Ci2.

At the left end of the excitation coil L1 is a diode D1 for transistor protection. The anode of D2, the cathode of diode D3, which also protects the transistor, the emitter of transistor Q1, and the collector of transistor Q2 are connected. The emitter of a switching transistor Q3, the cathode of a diode D1, and a resistor R1 are connected to the base of the transistor Q1. R2 and R3 are connected to the base of the switching transistor Q2.

Resistors R4 and R5 are connected to the bases of transistors Q1 to Q3. Further, the collector of the transistor Q1 and the cathode of the diode D2 are connected to the 6V dry battery B1 of the power supply, and the potentials of the other end of the resistor R2, the emitters of the transistors 1 to Q2, and the anode of the diode D3 are held at Ov. . Further, the other end of the resistor R4 and the collector of the transistor Q3 are connected to the cathode of the diode Db, and the anode of the diode Db is connected to the electrode i1.
! I81 is connected to a DC-DC converter CO, and connected to a stabilized 5V power supply obtained by boosting and stabilizing the voltage.

Further, a signal from the CPU 8 specifying the excitation phase is input to the input terminal 1 connected to the resistor R5.

Also, excitation LL I/L, 11. If a voltage of 3.6V (7) is applied to L2, the carriage pulse motor 10 is the desired one)
It is configured to rotate depending on the degree of vermilion.

In addition, the circuit ci1. ct 2 is excited in each -
It is symmetrical about L1 and L2.

That is, for circuit Ci 1, transistor Q1
．． Q2. Q3 has 1 to transistor Q4°R5, respectively.
R6, diode D1. D2. D3 has a diode D4. D5. D6, resistance R1゜R2, R4,, R5
are respectively R3, R6, r? , 7°R8, input terminal 1
1 corresponds to the input terminal I2.

In addition, the circuit Ci 1 and the circuit Ci 2 have exactly the same configuration, and the input terminal 13 and I
It is equipped with 4.

The operation of the above configuration will now be described with reference to FIGS. 1 to 14.

In step I) in FIG. 7, first, in step 141, the power supply for supplying power to the entire magnetic recording device 6 is turned on.

Next, the process advances to step 142.
l) Among i 13, the photocoupler 33 for detecting the position of the magnetic head 1 is energized to detect whether the position of the magnetic head 1 mounted on the carriage 9 has reached the rack O or west of the magnetic disk 1. and make it detectable. Next, the process advances to step 143 and the magnetic head 1 is moved to the 1-rack O. Next, the process proceeds to step 144, where the power supply to the photocoupler 33 for detecting the position of the magnetic head is stopped. Next, the process proceeds to step 145, where computer 1, which is the host device,
7, it is determined whether a command has been input or not, and if no command has been input, the system waits as it is. On the other hand, if a command is input here, the process advances to the next step 146, and the disk 911 and the index holder 911 of the photo sensor mechanism 13 are used to detect the rotational position of the magnetic disk 1, that is, the index position. Electricity is supplied to the tokabura 28 to rotate the magnetic disk and to enable detection of the index position.

Next, the process advances to step 147, where it is determined what process the input command is to perform. Then step 148
Proceeding to step 147, if the command input from the computer 17 is an error, it outputs a signal indicating the error according to the command determination at step 147, and performs error processing, writing ID field information, etc. on the magnetic disk in advance to the part where there is no data. performs initialization processing to enumerate O, data writing and reading processing, etc. Next, the process proceeds to step 149, where processing results corresponding to each process, such as a signal indicating that the process in step 148 has been completed, are output. Next, the process advances to step 150, where a state in which there is no command power and no access from external post equipment continues for 5 seconds after the last command input from the computer 17. make a judgment as to whether or not the Here, if a new command is input, the process returns to step 147 to process the new command. On the other hand, if no command is input for 5 seconds in step 150, the process proceeds to step 151, and the power supply to the disk motor 11 and the index photocoupler 28 is stopped.

Next, among the processing in response to the command in step 148, the processing of RIE 1 to RIE 1 will be described in detail.

In FIGS. 8 to 10, first in step 151 R
Clear the seek counter 15a of AM15. Next, the process proceeds to step 152, where a write command such as the hard sector number of the hard sector to be written is received from the computer 17 and written into the RAM 15. Next, the process proceeds to step 153, where the write protect HM 13a is energized to enable detection of the write inhibit tab provided on the cartridge containing the magnetic disk. Next step 15
In step 4, the write protection mechanism 138 detects whether or not a write prohibition tab has been set to prohibit new writing in order to save the contents recorded on the magnetic disk. Here, if the write-protect tab is set, go to step 155 and write-protect the tab.
After stopping the power supply to Jt Sugi 13a, step 156
Then, a signal indicating that writing to the magnetic disk is not possible is output to the computer 17, and the write process is stopped. On the other hand, if the write-protection tab is not set, the process goes to step 157, and after stopping the power supply to the write protection mechanism 138, the process goes to step 158.
In step 152, the hard sector number written in the RAM 15 is read, and the magnetic head 1 seeks, that is, moves to the designated track. Next, the process proceeds to step 159, in which the disk motor 11 and the index photocoupler 28 are energized. Next, the process proceeds to step 160, where the read counter 15b is cleared. Next, the process proceeds to step 161, where power is supplied to the read amplifier 5a, data for one hard sector is read from the track where the magnetic head 1 is currently located, and written into the RAM 15. Next, the process proceeds to step 162, where power to the read amplifier 5a is cut off. Next, proceed to step 163, and step 161
Then, refer to the remaining bits excluding the lower 1 bit of the hard sector number data out of the old data entered into ΔM15, and find out where the magnetic head 1 is currently located and where the target hard sector is located. Determine whether there is a truck or not, and if it is the desired truck, step 1 in Figure 9
The program proceeds to step 64 and outputs a ready signal to the computer 17 indicating that it is ready to write data onto the magnetic disk. Next, the process proceeds to step 165, where information specifying the equally divided logical sectors Ll) for writing data is received from the computer 17. Next, the process proceeds to step 166, where the logical sector L specified by the computer 17 is
Enter the address of RAM 15 corresponding to p.

In this embodiment, the length of one divided logical sector Ll specified by the logical sector length code Lm is multiplied by the value obtained by subtracting 1 from the logical sector number p, and then 1) 8M15
The start address at which data is to be written is added to determine the corresponding address in the RAM 15. Next step 1
The process advances to step 67, where the data to be written to the magnetic disk is received from the computer 17 and written to the area of the RAM 15 designated by the address set in step 166. Next, the process proceeds to step 168, and in step 167, the CRC'F--31 樟 of the data is written into the RAM 15 and the result is written into the RAM 15. Next, the process proceeds to step 169, and as shown in FIG.
The magnetic head 1 is moved to the outside of the magnetic disk by two pulses (125 μn+) of the control signal to the cartridge pulse motor 10 from the center of the i-th rack.

In addition, in the same figure, the dashed dotted line indicates the n-1st, nth, and n+
The center of each of the 11th tracks is shown, which is actually a circular arc, but is shown as a straight line to simplify the figure. Further, the distance between the centers of each track is 6 pulses (375 μm). 1a and 1b indicate the positional relationship between the magnetic head 1 and the track center when erasing both sides of the center of the n-th track one by one, and 1G indicates the positional relationship between the magnetic head 1 and the track center when performing reading and writing. It shows the positional relationship. Ma I [, n+1 of magnetic head 1
A similar relationship with the th track is shown by a dash-dotted line.

Next, the process proceeds to step 170, in which the index photocoupler 28 determines whether or not the position of the magnetic disk currently corresponding to the magnetic head 1 is the hard sector to which data is to be written. This is done by detecting the output signal of the indexing photocoupler 28 which is interlaced with the side surface 25a of the rotary body 25 which rotates in synchronization with the rotation body 25.

Here, if it is not the target hard sector, the detection of the output signal is continued until it becomes the target hard sector, and if it is the target hard sector, the process advances to the next step 171.

Here, power is supplied to the write amplifier 5 to energize the magnetic head 1 for halaying, thereby performing erasing. Next, the process proceeds to step 172, where it is detected that the output signal of the indexing photocoupler 28, which is interleaved with the rotating body 25, changes by the slots (26 and 27), and the erasing of one sector of the magnetic disk is completed. It is determined whether or not the erase has been completed, and if it has not been completed, the erase continues. On the other hand, if the erase is completed, proceed to the next step 1.
Step 73, the power supply to the magnetic head 1 is stopped, and while the other hard sector on the same track is passing over the magnetic head 1, a hard sector is moved from the center of the nth track as shown in FIG. 11b. The magnetic head 1 is moved inside the magnetic disk by two pulses (125 μll1). Next, the process proceeds to step 174, where the magnetic head 1 is energized for erasing to perform erasing. Next, the process advances to step 175, and in the same manner as step 172, it is determined whether or not erasing of one hard sector of the magnetic disk has been completed.If not, erasing continues. On the other hand, if the erasure is completed, the process proceeds to the next step 176, where the power supply to the magnetic head 1 is stopped, and the magnetic head 1 is returned to the center of the n-th track as shown in FIG. 11C. Next, the process proceeds to step 177, where the magnetic head 1 is energized based on the data stored in the RAM 15 from the computer 17, and data corresponding to one hard sector is written to the nth track. Next, the process proceeds to step 178, where power to the light amplifier 5 is cut off.

In addition, when correcting a part of the data inserted into the magnetic disk, first write the data of one hard sector including the correction part, that is, the data from HL to DC in FIG. 5(a), to the magnetic disk. The data is read from the memory and written to the RAM 15. Next, the corrected portions of the data written in the RAM 15 are replaced with new data, and one hard sector worth of data is written from the RAM 15 to the magnetic disk in the same manner as described above.

On the other hand, if it is determined in step 163 that there is no target hard sector on the track where the magnetic head 1 is currently located, the process goes to step 179 in FIG.
Add 1 to 5b. Next, the process proceeds to step 180, where it is determined whether or not the read counter 15b is 4. If it is not 4, the process proceeds to step 161. On the other hand, if the read counter is 4, the process advances to the next step 181 and the RA
Add 1 to the seek counter 15a of M15.

However, if the hard sector number read from the magnetic disk in step 161 is not the desired hard sector number, the read is repeated up to three times.

Next, the process advances to step 182, and the seek counter 15a is set to 4.
If it is 4, the process proceeds to the next step 183, and an error signal indicating that an error has occurred is output to the computer 17. Meanwhile, step 182
If the seek counter is not 4 in step 18
4, and the photocoupler 33 for detecting the position of the magnetic head 1
energize. Next, the process proceeds to step 185, where the magnetic head 7
Move from 1 to rack O position. Next step 18
Proceed to step 6, and connect the position detecting follo 1 to coupler 3 of the magnetic head 1.
After stopping the energization to 3, the process proceeds to step 158. However, if the desired hard lid M number cannot be read even after repeating the read in step 161 three times,
The magnetic head 1 is moved to track O again, the seek to the target track is redone, and the hard sector number is read again. Again, if you cannot read the target hard sector number, try reading the hard sector number again as described above.

If the target hard sector number cannot be read even after re-reading up to three times, the seek to the target track as described above is restarted from track O. If the target hard sector number cannot be read even after repeating this seek three times, an error signal is output to the computer 17 as shown in step 183.

In this embodiment, erasing is first performed on both sides of the center of the track, and then data is written. However, by adjusting the width of the center portion of the track where data is left without being erased, There is no problem in writing data first and then erasing both sides.

Next, a detailed explanation will be given of the read process that is the back of the process in response to the command in step 148 of FIG.

12 and 13, first, in step 191, the seek counter 15a in the RAM 15 is cleared.

Next, the process proceeds to step 192, where a read command is received from the computer 17, and the hard sector number and logical sector number for the designated read are written into the RAM 15. Next, the process proceeds to step 193, where it is determined whether the data in the hard sector specified by the read command has already been written into the RAM 15, and if it has been written, there is no need to read it from the magnetic disk. Therefore, the process goes to step 202, which will be described later. On the other hand, if the data has not been written to the RAM 15, the process advances to step 194, and a seek is performed to a track in the hard sector specified by the read command. Next, the process proceeds to step 195, where the disk motor 11 and the index photocoupler 28 are energized to start rotating the magnetic disk, making it possible to detect the index position. Next, the process advances to step 196, and the RAM 15
The inner number counter 15b is cleared.

Next, the process advances to step 197, and if the 2 existing on the same track
The index photocoupler 28 determines whether or not the target hard sector from which data is to be read is currently located at a position corresponding to the magnetic head 1.
This is done by detecting the output signal of Here, if it is not the target hard sector, the detection of the output No. 3 is continued until it becomes the target hard sector, and if it is the target hard sector, the process advances to the next step 198. Here, first, power is supplied to the read amplifier 5a, data of a hard sector length is read from the magnetic disk, and the data is read by the number of bytes indicated by this hard sector length and written to a predetermined area of the RAM 15. Next, proceed to step 199, and calculate the CRC data of the data read from the magnetic disk, and hJ
Compare the calculation result with the read CRC data. Next, the process proceeds to step 200, where it is determined whether the h1 calculation result and the read CRC data are equal, that is, whether the result of the CRC check is correct. If it is correct here, proceed to the next step 201, determine whether the data read from the magnetic disk is the data of the target hard sector or not based on the read hard sector number, and read the data of the target hard sector. If so, proceed to the next step 202. Here, the address corresponding to the logical sector Lp specified by the read command is set in the same manner as in step 166 in FIG.
It is read from and output to the computer 17, and the process ends. On the other hand, if the result of the CRC check is incorrect in step 200, or if the data is not in the target hard sector as determined in step 201, the process proceeds to step 203, where 1 is added to the read counter 15b.

Next, the process proceeds to step 204, where it is determined whether the read counter value is 4 or 100. If it is not 4, the process proceeds to step 197 again. On the other hand, if it is 4, proceed to the next step 20.
5, and 17 is added to the seek counter 15a. Next, the process advances to step 206 and the value of the seek counter 15a is 4.
Make a judgment as to whether or not. Here, if it is not 4, the process goes to step 207, and the first position detection screen of the magnetic head 1 is set.
~ Power is applied to coupler 33. Next, proceed to step 208,
Seek magnetic head 1 to track 0. Next, the process proceeds to step 209, where the energization to the first coupler 33 for detecting the position of the magnetic head 1 is stopped, and the process then proceeds to step 194 again. On the other hand, if the value of the seek counter 15a is 4 in step 206, the process advances to step 210, where an error signal is output to the computer 17 and the read process is stopped.

In other words, the CRC of the data read from the magnetic disk
If the check result is incorrect or the data is not in the intended hard sector, rereading is repeated up to three times until the data is read correctly. If correct reading is still not possible, the magnetic head 1 seeks again to track 0, and then seeks again to the target track to read. This read is also repeated up to three times until the read is performed correctly, and if the read still cannot be performed correctly, the seek is repeated again and then the read is performed. The seek operation including this read is repeated up to three times until the read is performed correctly, and if the read is still not performed correctly, an error signal is output to the computer 17 and the read process is stopped.

Next, positioning control of the magnetic head 1 will be explained in detail.

In FIG. 14, first, in step 221, it is determined whether or not there is access for positioning the magnetic head 1, and if there is no access, the process remains on standby.

On the other hand, if there is access to send the magnetic head 1, the process proceeds to the next step 222, where it is determined whether or not the direction of the destination position to which the magnetic head 1 is sent is in the outer circumferential direction. here,
If the target position is in the outer circumferential direction and not in the IJ direction, the target position remains as it is or if it is in the inner circumferential direction, the process advances to the next step 223 and the feed amount buffer 715G in the RAM 15 is stored.
is set to a value that corresponds to a feed amount greater by two steps in the carriage pulse motor 10, that is, two changes in the excitation current, than the target position to which the four-grid tooth 9 is sent. Next, the process advances to step 224, and based on the excitation phase difference of the excitation buffer 115d in RΔM15, that is, the excitation state of the coil of the carriage pulse motor 10, the process proceeds to the carriage pulse Tanabata 10. It supplies excitation current.

Note that when the power is turned on, the step 143 in FIG. 7 is not shown.
At 1'F, the magnetic head 1 is moved to racks 1 to 0 of the magnetic disk. And, in the excitation buffer 15d,
As an initial state, one excitation phase data indicating the excitation state of the carriage pulse motor 10 at the time of completion of the seek to track O is set. Therefore, after powering on,
For the first access to send the magnetic head 1, in step 224, the carriage pulse motor 10 changes to the excitation state f at the time of completion of the seek to track O in a3 when the power is turned on.
Excitation is performed based on excitation phase data indicating m.

Next, the process proceeds to step 225, where one step is removed from the feed suspension buffer 15C. Next, the process proceeds to step 226, where it is determined whether the value of the feed m buffer 15c is O. Here, if it is O, proceed to the next step 227,
Excitation phase data indicating an excitation state that moves the carriage 9 one step toward the inner circumference of the magnetic disk is stored in the excitation buffer 1.
5d, and go to step 224 again. On the other hand, if the feed m buffer 15c is O in step 226, the process goes to step 228, and excitation phase data for moving the carriage 9 one step toward the outer circumference of the magnetic disk is set in the excitation buffer 15d. Next, proceed to step 229,
Based on the excitation phase data of the excitation buffer 15d, an excitation current is supplied to the carriage pulse motor 10 to rotate it one step.

Next, the process proceeds to step 230, where the excitation 1i current to the carriage pulse motor 10 is cut off. On the other hand, step 222
If the direction of the target position to which the magnetic head 1 is sent is toward the outer circumference of the magnetic disk, go to step 231 and set the feed amount buffer 15c to a value that is one step larger in the carriage step motor 10 than the target position to which the carriage 9 is sent. Set to . Next, the process advances to step 232, and the excitation buffer? Excitation 1 & current is supplied to the carriage pulse motor 10 based on the excitation phase data of 15d. Next, the process proceeds to step 233, where one step is subtracted from the feed indication buffer 715C. Next, the process proceeds to step 234, where it is determined whether or not the feed amount buffer 115C is O. If it is 0, the process proceeds to step 230.

On the other hand, if it is not 0, proceed to step 235, set excitation phase data in the excitation buffer 15d to move the carriage 9 one step toward the outer circumference of the magnetic disk, and proceed to step 232 again until the carriage 9 reaches the target position. Continue the transition.

Furthermore, the excitation in steps 224 and 232 at the start of the carriage 9 transition is performed based on the final excitation phase data in the previous transition of the carriage 9, since the excitation buffer 15d has not yet been rewritten. You will be killed. In other words, it does not contribute to the rotation of the carriage pulse motor 10, but instead performs the excitation in the previous state. Therefore, even if the position of the carriage 9 deviates in the direction opposite to the direction in which the next movement will be made while the excitation of the carriage pulse motor 10 is cut off, it will be lower than the excitation position for the next movement. Since the excitation position in front of the carriage pulse motor 10 near the rotor is energized, it is possible to easily prevent step-out due to insufficient excitation force to attract the rotor.

As described above, the carriage 9 is always stopped after moving in a certain direction, and in this embodiment, after moving toward the outer circumference of the magnetic disk.

Therefore, one end of the presser bar 9a is fixed to the carriage 9.
The play in the engagement with the teeth of the lead screw 10b is always concentrated in a certain direction when stopping.

Therefore, the accuracy of positioning the carriage 9 can be improved.

Next, the operation of the excitation circuit of the carriage pulse motor 10 will be explained.

This carriage pulse motor 10 has two excitation coils L1. L2 is simultaneously excited to make four phases and driven by two-phase excitation.

For example, when a low potential level signal is applied to input terminal 11 and a high potential level signal is applied to input terminal 2, transistor Q2. Q
4 and Q6 are in the OFF state, and the transistor Q3 is in the ON state, so that the transistors Q1. Q5 is also turned on. In addition, the left end of the excitation coil L1 has a forward voltage drop of approximately two pn junctions between the diode Db and the base and emitter of the transistor Q1 ().The potential drops from the stabilized 5V power supply and approaches approximately 3.611. is maintained. This potential is t4? based on the output voltage of the dry battery B1 of the power source stabilized at 5V. Therefore, as the dry battery B1 wears out, its output voltage fluctuates, and C also remains almost constant. Therefore, even if the output voltage is higher than 3.6V because the dry battery B1 is new and not exhausted, the transistor Q1 is operating in the linear operation region, so its impedance changes depending on the voltage between the collector and emitter. However, the left end of the excitation coil L1 is maintained at approximately 3.6 square centimeters, and a substantially constant current flows from the left end to the right end of the excitation coil L1 regardless of fluctuations in the output voltage of the dry battery B1.

In addition, in order to protect the circuit and obtain a certain level of performance in the rotation of the carriage pulse motor 10, when the output voltage of the dry battery B1 becomes less than 3.7V, the DC-DC is used to obtain a stabilized power source. It is designed to stop the oscillation in the converter CO and stop the operation of the circuit.

Furthermore, when a high potential level signal is applied to the input terminal 11 and a low potential level signal is applied to the input terminal I2, the first transistor Q1,
03 and Q5 are in the OFF state, and transistors Q2.03 and Q5 are in the OFF state. Q4 and 06 are in ON state. Therefore, by the same operation as described above, a substantially constant current flows from the end of the excitation coil L1 toward the left end, that is, in the opposite direction to that described above, regardless of fluctuations in the output voltage of the dry battery B1.

In other words, the state of the excitation phase is determined by which input terminal is set to a high potential level or a low potential level. Further, a similar operation occurs for the circuit Ci2.

In addition, 1 to transistor Q1. A similar operation is possible even if a total of four Zener diodes are used to set the base potential of each of the transistors in Q4 and the corresponding circuit Ci2, but all the circuits in this example have the same Since the setting is made using a stabilized 5V power supply, the operating points of each transistor can be aligned more reliably.

[Effect] As detailed above, the magnetic information recording device according to the present invention supplies power to the write amplifier during the information reading process 1 on the magnetic recording medium, and supplies power to the read amplifier during the information writing process. Control is possible to cut off the power supply to each amplifier. Therefore, unnecessary power consumption can be suppressed and low power consumption can be achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a perspective view showing the structure of a magnetic head, FIG. 3 is a diagram showing an index detection mechanism, and FIG. 4 is a diagram showing a carriage position detection mechanism. Figure 5(a) 2 is a diagram showing the format of information recording, Figure 5(b) is a table explaining logical sectors, and Figure 5(a) is a diagram showing the format of information recording.
The figure shows the excitation circuit of the carriage pulse motor, Figure 7 is a flowchart showing the overall operation, Figures 8 to 10 are flowcharts showing the write operation, and Figure 11 is the position of the magnetic head and track. Diagram showing relationships, 12th
FIG. 13 is a flowchart showing the operation of the lead,
FIG. 14 is a flowchart 1 to 10 showing control of positioning of the magnetic head. In the figure, 1 is a magnetic head, 2 and 2a are yokes, 3 and 4
is a coil, 5 is a head excitation circuit, 6 is a magnetic recording device, 7
1 is a koshitsu circuit, 8 is a medium heat treatment device, 9 is a carriage, 9a is a presser bar, 1o is a pulse motor for the carriage,
10b is a lead screw, 11 is a disc motor,
12 is a motor driver, 13 is a photosensor mechanism, 13
a is a write protection mechanism, 13b is a photosensor power switch, 13c is a write protection 1 to power switch, 14 is a ROM, 15 is a RAM, 15a is a seek counter, 15b is a read counter, 15c is a sending buffer 1
．． 15d is an excitation buffer 1.25 is a rotating body, 25a is a side surface of the rotating body, 26 and 27 are slits, 28 is an index photocoupler, 28a and 33a are light emitting diodes, 2
8b and 33b are transistors, 29 is a circle indicating the position of the magnetic disk, 30 and 31 are guide bars, 3
2 is a protrusion, 33 is a position detection folio] ~ coupler, Ll and L2 are excitation coils, Ql to Q6 are transistors, B1
is a dry battery. Patent Applicant Brother Kawashima President Brother Industries, Ltd. Figure 4 Figure 5 (a) Figure 5 (b) Figure 7 Figure 12! y, "(i Figure 11-"

Claims (1)

[Claims] 1. A read amplifier that amplifies signals read from a magnetic recording medium by a magnetic head, and a magnetic head that amplifies data signals to be recorded and erase signals when writing signals to the magnetic recording medium. A magnetic information recording device having a write amplifier that outputs power to the read amplifier and the write amplifier, a power supply means installed between both amplifiers and the power supply means, and a power supply means for supplying power to the read amplifier and the write amplifier; A cutoff means for cutting off the power supply to each amplifier, a detection means for detecting whether a read process or a write process is in progress, and a means for controlling the operation of the cutoff means based on an output from the detection means. A magnetic information recording device characterized by: