JPH0373924B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a read amplifier that amplifies the signal of information read from a magnetic recording medium by a magnetic head, and amplifies the signal of the information to be written and the signal of erase when writing the signal. The present invention relates to a magnetic information recording device having a write amplifier.

[Prior Art] Generally, 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 writing, erasing, and reading processing. There is.

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 the write amplifier and the power supply means for supplying power to these amplifiers, The purpose is to control the cutoff means depending on whether a read process or a write process is in progress.

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

In FIG. 1, a magnetic head 1 that performs writing, reading, and erasing using the data FM recording method on a magnetic disk stored in a cartridge is wound around a yoke 2 as shown in FIG. A light amplifier 5 that controls the current flowing to the coils 3 and 4 being turned;
It is also connected to a read amplifier 5a that amplifies the signal read from the magnetic head 1. Further, the write amplifier 5 and the read amplifier 5a are connected to a central processing unit (hereinafter referred to as CPU) via a logic circuit 7 that exchanges logic signals with each part of the magnetic recording device 6.
8 is connected. 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 for rotating 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. It is also used for an index, that is, for detecting whether or not the data on a track of a magnetic disk starts at a break point position, and for detecting whether or not the magnetic head 1 mounted on the carriage 9 is at the outermost track position of the magnetic disk, that is, the position of a break in the track of the magnetic disk. Magnetic head 1 for detecting whether or not it is located at 0
A photo sensor mechanism 13 for detecting the position of a magnetic disk and a write protect mechanism 13a for detecting a write-protection tab provided on a cartridge containing a magnetic disk are connected to the CPU 8 via a logic circuit 7.
It is connected to the. If a write inhibit tab is set to prevent accidental erasure of data written on the magnetic disk, the write protect mechanism 13a detects this and outputs a signal indicating write inhibition to the logic circuit 7. It's summery. Further, a photo sensor power switch 13b and a write protect power switch 13c are connected between the photo sensor mechanism 13, the write protect mechanism 13a, and the logic circuit 7, respectively, and similarly, the write amplifier 5 and the read amplifier 5a, A write amplifier power switch 5b and a read amplifier power switch 5c are connected to the logic circuit 7, respectively.

Also, there is a ROM (read-only memory) 14 in which programs for each process are written, a seek counter 15a that stores the number of times the magnetic head 1 is set to track 0 of the magnetic disk for error checking, and a seek counter 15a that stores data from the magnetic disk. A read counter 15b that stores the number of times the data has been read, a feed buffer 15c that stores data on the feed amount of the carriage pulse motor 10, an excitation buffer 15d that stores data on the excitation phase of the carriage pulse motor 10, and an excitation buffer 15d that temporarily stores data. Working RAM15, which works as a buffer etc., is CPU8
It is connected to the. Further, an interface 16 for exchanging signals between an external host device and the magnetic recording device 6 is connected to the CPU 8 and also to a computer 17 as a host device.

In FIG. 2, three terminals 18, 19, 20 are provided on two coils 3, 4 wound in the same direction around a yoke 2 made of ferrite. When writing, that is, writing data to the magnetic disk, the current is selectively passed from the terminal 18 to the terminal 19 and from the terminal 20 to the terminal 19, depending on the data to be written. The structure is such that signals having two types of magnetization directions can be written to the magnetic disk. Further, when reading, that is, reading data written on the magnetic disk, the structure is such that the terminal 18 to the terminal 20 are used as one continuous coil to read the signals on the magnetic disk. In addition, erasing, that is, erasing data written on a magnetic disk,
The configuration is such that DC magnetization is performed only in the direction of magnetization at the end of the last write. Magnetization is performed in the gap 21 between the yoke 2 and the yoke 2a, and these two yokes 2 and 2a are connected by a back bar 22 so that the magnetic flux is continuous.
Sliders 23 made of barium titanate are provided on both sides of 2a.

In FIG. 3, a rotating body 25 is fixed to a spindle 24 driven by a disk motor 11. As shown in FIG. A first slit 26 having a wide width and a second slit 27 having a narrower width provided at a position shifted by 180 degrees are provided on a side surface 25a of the rotating body 25. In addition to the central shaft hole, a tracking hole 24b is provided in the core bar 24a of the magnetic disk, into which a tracking pin 24c that rotates in synchronization with the spindle 24 is inserted. The magnetic disk is given a rotational force by this tracking pin 24c and is pressed in the outer circumferential direction to accurately position it, and is always set in the same positional relationship with the slits 26 and 27 of the rotating body 25,
Slit 26 is attached to the hard sector with the smaller hard sector number on the same track.
7 corresponds to the larger numbered hard sector. 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 rotating body 25.
is interrupted by the side surface 25a of the first slit 26 and the second slit 2 having different widths.
When the magnetic disk 7 passes, different signals are output, and by detecting these signals, the rotational position of the magnetic disk, that is, the index position can be determined. Here, two slits 26, 2 having different widths are formed on the side surface 25a of the rotating body 25.
The reason why each track on the magnetic disk is divided into two parts within the same track and each track is made up of two hard sectors is that the two index positions are shifted by 180 degrees. This is because it is necessary to detect each 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 placed has two guide bars 30 fixed to the body at both ends,
Guided by 31. Further, a presser bar 9a whose one end is fixed to the carriage 9 is connected to a lead screw 10 mounted on a rotating shaft of a carriage pulse motor 10 supported by a motor guide 10a.
It meshes with tooth b. Therefore, the carriage 9
is guided by the guide bars 30, 31 by the rotation of the carriage pulse motor 10, and the magnetic head 1 moves from the outermost track 0 of the magnetic disk to the innermost track 39 shown by the two-dot chain line in the figure. The configuration is such that it is possible to migrate up to 40 tracks. 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. The carriage 9 is also provided with a protrusion 32 for detecting track 0, which interrupts a position detecting photocoupler 33 consisting of a light emitting diode 33a and a phototransistor 33b when the magnetic head 1 is located at track 0 of the magnetic disk. However, the position detecting photocoupler 33 outputs a signal indicating that the magnetic head 1 is located on track 0.

FIG. 5a shows a recording format for a magnetic disk. P is represented by a sequence of 0 signals such as 0, 0, 0... in the pre-part, and the next S is a start mark of 0,
It is represented by 0, 0, 1, 0, 0, 0, 0. next
The length of the hard sector is written in HL, and the length of the cedar
A hard sector number is written to HN. In this embodiment, each of the 40 tracks is divided into two hard sectors, so there are 80 hard sector numbers in total. The structure of the hard sector number is such that the lower one bit represents the distinction between two hard sectors on the same track, and the remaining bits represent the track. The next LL is a logical sector length code, and a desired logical sector length code LL from 0 to 6 can be written.
The logical sector L is equally divided into n pieces L1 _{, L2} , ...Lp, ...,Ln by the number of bytes corresponding to this logical sector length code LL, and specified as desired. The configuration is such that data is written to logical sector Lp. The number of bytes corresponding to each logical sector length code LL is 64, 80, 128, 256, in order from the smallest logical sector length code LL.
512, 1024, 1280, and if the entire length of logical sector L is divisible by each number of bytes, then
The length is determined by specifying the logical sector length code LL so that it is divisible by each number of bytes, such as 1280 bytes, or 1024 bytes if it is not divisible. Therefore, the relationship among each logical sector length code LL, the length of one equally divided logical sector Lp, the entire length of logical sector L, and the number of divisions n is as shown in the table of FIG. 5b. 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 part is made into an inaccessible area, the length of the logical sector L is not necessarily divisible. It is not necessary to set the entire length to be divisible by the length of the logical sector Lp, which is divided into equal parts. The next R is a reserve, which is an area where the user can freely write data such as the file name and whether or not data can be deleted.If this data is determined by an external host device such as the computer 17, the file This can improve the efficiency of organization. The next IC is the ID field, i.e. CRC (Cyclic Redundancy Check) of the data from HL to R.
This is the area where data is written. Next, DC is a data field, that is, an area where CRC data regarding the data of logical sector L is written. The next E is the post section, which is similar to the pre section.
Represented by a list of signals.

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

As shown in FIG. 6, the excitation coils L1 and L2 are independently excited by two circuits Ci1 and Ci2 having the same configuration.

At the left end of the excitation coil L1 are the anodes of diodes D1 and D2 for transistor protection, the cathode of diode D3, also for transistor protection, the emitter of transistor Q1, and the transistor Q2.
collector is connected. Transistor Q1
A switching transistor Q3 is installed at the base of the
The emitter of the diode D1, the cathode of the diode D1, and the resistor R1 are connected. R2 and R3 are connected to the base of the switching transistor Q2. A resistor R4 is connected to the base of the transistor Q3.
R5 is connected. Also, transistor Q1
The collector of and the cathode of diode D2 are connected to the 6V dry battery B1 of the power supply, and the resistor R2
The potentials at the other end, the emitter of transistor Q2 and the anode of diode D3, are held at OV. Also, the other end of the resistor R4 and the transistor Q3
The collector of is connected to the cathode of diode Db, and the anode of this diode Db is connected to a regulated 5V power source obtained by connecting dry battery B1 to DC-DC converter _C0 , boosting the voltage, and then stabilizing it. . In addition, input terminal 1 connected to resistor R5
1 receives a signal from the CPU 8 that designates the excitation phase.

Further, the carriage pulse motor 10 is configured to rotate at a desired speed if a voltage of 3.6V is applied to the excitation coils L1 and L2.

Further, the circuits Ci1 and Ci2 are symmetrical with respect to the excitation coils L1 and L2, respectively.
That is, for circuit Ci1, transistor Q
1, Q2, and Q3 have transistors Q4 and Q3, respectively.
Q5, Q6, diodes D1, D2, D3 have diodes D4, D5, D6, resistors R1,
R2, R4, and R5 have R3, R6, and R, respectively.
7, R8, and the input terminal I1 corresponds to the input terminal I2.

In addition, the circuit Ci1 and the circuit Ci2 have exactly the same configuration, and the input terminals I3 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 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, where the photocoupler 33 for detecting the position of the magnetic head 1 mounted on the carriage 9 is used to detect whether or not the position of the magnetic head 1 mounted on the carriage 9 has reached track 0 of the magnetic disk. Turn on the power and make it detectable. Next, the process advances to step 143, where magnetic head 1 is moved to track 0. Next, proceed to step 144.
The power supply to the photocoupler 33 for detecting the position of the magnetic head is stopped. Next, the process advances to step 145, where it is determined whether a command has been input from the computer 17, which is the host device, and if no command has been input, the process remains on standby. On the other hand, if a command is input here, the process proceeds to the next step 146, and energizes the disk motor 11 and the index photocoupler 28 of the photo sensor mechanism 13, which detects the rotational position of the magnetic disk 1, that is, the index position. , the magnetic disk is rotated and the index position can be detected. Next, the process advances to step 147, where it is determined what process the input command is to perform. Next 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 the ID field information is written in advance to the magnetic disk. Initialization processing of enumerating 0's, data writing and reading processing, etc. are performed on the part. Next, proceed to step 149, then step 148.
Outputs processing results according to each process, such as a signal indicating that the process in is completed. Next step
Proceeding to step 150, it is determined whether or not there is a continuous state of no command input for 5 seconds after the last command input from the computer 17, that is, a state of no access from an external host device. make a judgment. 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 at step 150, the process advances to the next step 151, where the disk motor 11 and index photocoupler 28 are
Stop energizing.

Next, the write process among the processes in response to the command in step 148 will be explained in detail.

In Figures 8 to 10, first step
151 clears the seek counter 15a of the RAM 15. Next, the process advances 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 mechanism 13a is energized to enable detection of the write inhibit tab provided on the cartridge containing the magnetic disk. Next step
The process advances to step 154, where the write protect mechanism 13a detects whether a write prohibition tab has been set that prohibits new writing in order to save the contents recorded on the magnetic disk. At this point, if the write-protect tab is set, click
After going to step 155 and stopping the power supply to the write protect mechanism 13a, the process goes to step 156, where a signal indicating that writing to the magnetic disk is essential is output to the computer 17, and the write process is stopped. On the other hand, if the write protection tab is not set, go to step 157, stop the power supply to the write protection mechanism 13a, and then go to step 157.
The program advances to step 158, reads out the hard sector number written in the RAM 15 in step 152, and seeks, that is, moves the magnetic head 1 to the track specified by this number. Next, the process proceeds to step 159, where the disk motor 11 and index photocoupler 28 are energized. Next, the process advances to step 160 and the read counter 15b is cleared. Next step
Proceed to 161, supply power to the read amplifier 5a,
1 from the track where magnetic head 1 is currently located.
Read hard sector data and save RAM15
Write to. Next, the process proceeds to step 162, where power to the read amplifier 5a is cut off. Next step 163
Then, by referring to the remaining bits of the data written to the RAM 15 in step 161 except for the lower one bit of the hard sector number data, it is determined that the track where the magnetic head 1 is currently located is the track where the target hard sector is located. Make a judgment as to whether or not
If it is the desired track, follow the steps in Figure 9.
The process advances to step 164 and outputs a ready signal to the computer 17 indicating that preparations for writing data to the magnetic disk are complete. Next, proceed to step 165, where logical sectors are divided into equal parts for writing data.
Information specifying Lp is received from the computer 17. Next, proceed to step 166 and computer 17
RAM corresponding to logical sector Lp specified by
Find address 15. In this embodiment, the length of one divided logical sector Lp specified by the logical sector length code LL is multiplied by a value obtained by subtracting 1 from the logical sector number p, and then the start address at which data is to be written in the RAM 15 is determined. plus
We are looking for the corresponding address in RAM15. Next, the process advances to step 167, where the data to be written to the magnetic disk is received from the computer 17, and the process proceeds to step 167.
Write to the area of RAM15 specified by the address found in step 166. Next, the process advances to step 168, and in step 167, the CRC data of the data written to the RAM 15 is calculated and the result is written to the RAM 15.
Next, proceed to step 169, as shown in FIG.
The magnetic head 1 is moved to the outside of the magnetic disk by two pulses (125 μm) of the control signal to the carriage pulse motor 10 from the center of the n-th track where the target hard sector is located.

In the figure, the dashed-dotted lines indicate the centers of the (n-1)th, n-th, and (n+1)th tracks, which are actually circular arcs, but are shown directly to simplify the diagram. Also, the distance between the centers of each track is 6
This is the pulse length (375 μm). 1a and 1b are n
1c shows the positional relationship between the magnetic head 1 and the center of the track when erasing both sides of the center of the th track one by one, and 1c shows the positional relationship between the magnetic head 1 and the center of the track when reading and writing. There is. Further, a similar relationship with the (n+1)th track of the magnetic head 1 is shown by a two-dot chain line.

Next, the process proceeds to step 170, in which judgment is made as to whether or not the position of the magnetic disk currently corresponding to the magnetic head 1 is the target hard sector in which data is to be written. Rotating body 2 that rotates
This is done by detecting the output signal of the indexing photocoupler 28 that is interrupted on the side surface 25a of the lens 5.
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, and the magnetic head 1 is energized to erase, thereby performing erasing. Next, proceeding to step 172, the output signal of the index photocoupler 28, which is interrupted by the rotating body 25, is output to the slit 2.
6 and 27 is detected, it is determined whether erasing of one hard sector of the magnetic disk has been completed, and if it has not been completed, the erasing continues. On the other hand, if the erase is completed, the process advances to the next step 173, where the power supply to the magnetic head 1 is stopped, and while the other hard sector on the same track is passing through the magnetic head 1, the first hard sector is erased.
1. As shown in FIG. 1b, the magnetic head 1 is moved inside the magnetic disk by two pulses (125 μm) from the center of the nth track. Next step 17
4, the magnetic head 1 is energized for erasing and erased. Next, the process advances to step 175, and in the same way 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 erase is completed, the process advances 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 nth track as shown in FIG. 11c. Next, proceed to step 177.
Computer 17 written in RAM 15
The magnetic head 1 is energized based on the data from the magnetic head 1, and one hard sector worth of data is written to the nth track. Next, proceed to step 178,
Cut off the power to the light amplifier 5.

In addition, when correcting part of the data written on the magnetic disk, firstly, the data for one hard sector including the corrected part, that is, the data in Figure 5 a.
Data from HL to DC is read from the magnetic disk and written to RAM15. Next, RAM15
The corrected part of the data written in is rewritten 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 in step 163 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. 10, and 1 is added to the read counter 15b of the RAM 15. Next, the process advances 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 180.
Go to 161. On the other hand, if the read counter is 4, the process advances to the next step 181 and adds 1 to the seek counter 15a of the RAM 15. That is,
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 step
Proceed to step 182, determine whether the seek counter 15a is 4, and if it is 4, proceed to the next step.
The process advances to step 183 and outputs an error signal to the computer 17 indicating that an error has occurred. On the other hand, if the seek counter is not 4 in step 182, the process goes to step 184, where the position detecting photocoupler 33 of the magnetic head 1 is energized. Next step 185
Then move the magnetic head 1 to the track 0 position. Next, proceed to step 186 and read the magnetic head 1.
After stopping the power supply to the position detection photocoupler 33, the process proceeds to step 158. That is, step
If the target hard sector number cannot be read even after repeating the read with 161 three times, move magnetic head 1 to track 0 again, seek to the target track again, and read the hard sector number again. Take the lead. Again, if the target hard sector number cannot be read, the hard sector number is read again as described above. If the target hard sector number cannot be read even after retrying the read up to three times, the seek to the target track as described above is restarted from track 0. 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 even if data is written first and then both sides are erased.

Next, the read process among the processes in response to the command in step 148 in FIG. 7 will be described in detail.

In Figures 12 and 13, first step
191, the seek counter 15a in the RAM 15 is cleared. Next, the process advances 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 of the hard sector specified by the read command has already been written to the RAM 15. If it has been written, there is no need to read it from the magnetic disk, so this will be described later. Go to step 202. 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 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 read counter 15b in the RAM 15 is cleared. Next step
Proceeding to step 197, the output of the index photocoupler 28 is used to determine whether or not the target hard sector from which data is to be read is currently located at the position corresponding to the magnetic head 1 among the two hard sectors existing on the same track. This is done by detecting a signal. If it is not the target hard sector, continue detecting the output signal until the target hard sector is reached, and if it is the target hard sector, proceed to the next step 198.
Proceed to. 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, proceeding to step 199, the CRC data of the data read from the magnetic disk is calculated, and the calculation result is compared with the read CRC data. Next, proceed to step 200, and check whether the calculation result and the read CRC data are equal or not.
That is, it is determined whether the result of the CRC check is correct or not. If it is correct here, proceed to the next step 201, and judge whether or not the data read from the magnetic disk is the data of the target hard sector based on the read hard sector number. If the data is , proceed to the next step 202. Here, the address corresponding to the logical sector Lp specified by the read command is found in the same manner as step 166 in FIG. 9, and the data at this address is read from the RAM 15 and output to the computer 17, and the process is terminated. On the other hand, step
If the result of the CRC check is not correct in step 200, or if the data is not in the target hard sector as determined in step 201, the process advances to step 203 and 1 is added to the read counter 15b. Next, the process advances to step 204, and the value of the read counter is 4.
If it is not 4, go to step 197 again. On the other hand, if it is 4, proceed to the next step 205 and set the seek counter 15a to 1.
Add. Next, the process advances to step 206 and it is determined whether the value of the seek counter 15a is 4 or not.
Here, if it is not 4, the process goes to step 207, and the position detecting photocoupler 33 of the magnetic head 1 is energized. Next, the process advances to step 208, where magnetic head 1 is sought to track 0. Next, the process advances to step 209, where the photocoupler 33 for detecting the position of the magnetic head 1 is
After stopping the energization, go 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. That is, if the result of a CRC check on the data read from the magnetic disk is incorrect or the data is not in the intended hard sector, the read is repeated up to three times until the data is read correctly. If the read still cannot be performed correctly, 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, the 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 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 not in the outer circumferential direction, that is, if the target position remains as it is or is in the inner circumferential direction, the process proceeds to the next step 223, and the RAM
The feed amount buffer 15c in 15 is
The value is set to a value corresponding 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 feed is sent. Next, the process proceeds to step 224, where an excitation current is supplied to the carriage pulse motor 10 based on the excitation phase data of the excitation buffer 15d in the RAM 15, that is, data indicating the excitation state of the coil of the carriage pulse motor 10.

When the power is turned on, the magnetic head 1 is unconditionally moved to track 0 of the magnetic disk as shown in step 143 in FIG. And the excitation buffer
In 15d, excitation phase data indicating the excitation state of the carriage pulse motor 10 at the time of completion of the seek to track 0 is set as an initial state. Therefore, for the first access to send the magnetic head 1 after the power is turned on, the carriage pulse motor 10 inputs excitation phase data in step 224 indicating the excitation state at the time of completion of the seek to track 0 at the time the power was turned on. Based excitation is performed.

Next, proceed to step 225 and set the feed amount buffer to 15.
Subtract 1 step from c. Next step 226
Then, it is determined whether the value of the feed amount buffer 15c is 0 or not. Here, if it is 0, proceed to the next step 227, set excitation phase data in the excitation buffer 15d indicating an excitation state that moves the carriage 9 one step toward the inner circumference of the magnetic disk, and proceed to step 224 again. . Meanwhile, step 226
If the feed amount buffer 15c is 0, the program goes to step 228, and sets excitation phase data in the excitation buffer 15d to move the carriage 9 one step toward the outer circumference of the magnetic disk. Next step 229
Then, 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 step
Proceed to step 230 and cut off the excitation current to the carriage pulse motor 10. On the other hand, if in step 222 the direction of the destination position to which the magnetic head 1 is sent is in the direction of the outer circumference of the magnetic disk, the process proceeds to step 231, where the feed amount buffer 15c is set to 1 in the carriage step motor 10 rather than the destination position to which the carriage 9 is sent. Set only the step to a larger value. Next, the process proceeds to step 232, where an excitation current is supplied to the carriage pulse motor 10 based on the excitation phase data of the excitation buffer 15d. Next, the process proceeds to step 233, where one step is subtracted from the feed amount buffer 15c.
Next, proceed to step 234, and set the feed amount buffer 15c.
It is determined whether or not is 0, and if it is 0, the process goes to step 230. On the other hand, if it is not 0, step 235
9, and move the carriage 9 toward the outer circumference of the magnetic disk.
Set the excitation phase data that sends one step to the excitation buffer 15d, go to step 232 again,
Transport continues until the carriage 9 reaches the destination position.

Furthermore, the excitation of steps 224 and 232 at the beginning of the transition of the carriage 9 is performed by the excitation buffer 15d.
Since the rewriting has not been performed yet, the rewriting will be performed based on the final excitation phase data of the previous transition of the carriage 9. In other words, it does not contribute to the rotation of the carriage pulse motor 10, but is energized in the previous state. Therefore,
While the carriage pulse motor 10 is de-energized, even if the position of the carriage 9 shifts in the opposite direction to the direction in which the next transition will occur, the carriage pulse will be lower than the excitation position for the next transition. Since the excitation position in front of the motor 10 near the rotor is excited, step-out due to insufficient excitation force to attract the rotor can be easily prevented.

As mentioned 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, the play in the engagement between the presser bar 9a, one end of which is fixed to the carriage 9, and the teeth of the lead screw 10b is always concentrated in a certain direction when stopped. 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 is driven by two-phase excitation by simultaneously exciting two excitation coils L1 and L2 to form four phases.

For example, when a low potential level signal is applied to input terminal I1 and a high potential level signal is applied to input terminal I2, transistors Q2, Q4, and Q6 are turned off, transistor Q3 is turned on, and therefore transistors Q1 and Q5 are also turned on. Become. In addition, the potential at the left end of the excitation coil L1 is lowered from the stabilized 5V power supply by the forward voltage drop of approximately two pn junctions between the diode Db and the base and emitter of the transistor Q1, and is kept at approximately 3.6V. It will be done. This potential is obtained based on the output voltage of the dry battery B1 of the power source stabilized at 5V, so even if the dry battery B1 is exhausted and the output voltage is turned on, it will always remain 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 the emitter. and excitation coil L
The left end of the excitation coil L1 is maintained at about 3.6V, and a nearly 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 supply. The oscillation in converter C ₀ is stopped and the operation of the circuit is stopped.

Further, when a high potential level signal is applied to the input terminal I1 and a low potential level signal is applied to the input terminal I2, the transistors Q1, Q3, and Q5 are turned OFF, and the transistors Q2, Q4, and Q6 are turned ON. Therefore, by the same operation as described above, a substantially constant current flows from the right end to the left end of the excitation coil L1, that is, in the opposite direction to that described above, regardless of fluctuations in the output voltage of the dry battery B1.

That is, 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.

Furthermore, the same operation is possible even if a total of four Zener diodes are used to set the base potentials of the transistors Q1 and Q4 and the transistors of the circuit Ci2 for these.
Since all the circuits of this embodiment are set using a common stabilized 5V power supply, the operating points of each transistor can be more reliably aligned.

[Effects] As detailed above, the magnetic information recording device according to the present invention supplies power to the write amplifier during information read processing from a magnetic recording medium, and supplies power to the read amplifier during information write processing. Control is possible to cut off the power supply for each. 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 one embodiment of the present invention;
FIG. 2 is a perspective view showing the structure of the magnetic head, FIG. 3 is a diagram showing the index detection mechanism, FIG. 4 is a diagram showing the carriage position detection mechanism, FIG. 5a is a diagram showing the information recording format, Figure 5b is a table explaining the logic sector, Figure 6 is a diagram showing the excitation circuit of the carriage pulse motor, Figure 7 is a flowchart showing the overall operation, and Figures 8 to 10 are the lights. A flowchart showing the operation, FIG. 11 is a diagram showing the positional relationship between the magnetic head and the track, and FIG.
2 and 13 are flowcharts showing the operation of the lead, and FIG. 14 is a flowchart showing the control of positioning of the magnetic head. In the figure, 1 is a magnetic head, 2 and 2a are yokes,
3 and 4 are coils, 5 is a head excitation circuit, 6 is a magnetic recording device, 7 is a logic circuit, 8 is a central processing unit, 9 is a carriage, 9a is a presser bar, 10 is a pulse motor for the carriage, and 10b is a lead screw. , 11 is a disk motor, 12 is a motor driver, 13 is a photo sensor mechanism, 13a is a write protect mechanism, 13b is a photo sensor power switch, 13c is a write protect power switch, 14 is a ROM, 15 is a RAM, 15a is a seek counter, 15b 15c is a lead counter, 15c is a feed amount buffer, 15d is an excitation buffer, 25 is a rotating body, 25a is a side surface of the rotating body, 26 and 27 are slits, 28 is a photocoupler for indexing, 28
a and 33a are light emitting diodes, 28b and 33
b is a phototransistor, 29 is a circle indicating the position of the magnetic disk, 30 and 31 are guide bars, 32
33 is a protrusion, 33 is a photocoupler for position detection, L1 and L2 are excitation coils, Q1 to Q6 are transistors, and B1 is a dry battery.

Claims (1)

[Claims] 1. A read amplifier that amplifies signals read from a magnetic recording medium by a magnetic head, and a read amplifier that amplifies signals of data to be recorded and erase signals when writing signals to the magnetic recording medium and sends the signals to the magnetic head. A magnetic information recording device having a write amplifier that outputs power, a power supply means for supplying power to the read amplifier and the write amplifier, and a power supply means provided between both amplifiers and the power supply means, and a power supply means for supplying power to the read amplifier and the write amplifier; The device is characterized in that it is provided with a cutoff means for cutting off the power supply to each of them, 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 the output from the detection means. magnetic information recording device.