JPH0437494B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field] The present invention detects the rotational position of a rotating magnetic recording medium, the position of a magnetic head, whether or not writing is possible on the magnetic recording medium, etc. The present invention relates to a magnetic recording device with a detection device that writes and reads data using a magnetic head.

[Prior Art] In general, this type of magnetic recording device with a detection device is equipped with a detection device such as a photocoupler or a mechanical switch with a movable piece that detects the state of each mechanical part and outputs a signal. Each part is controlled by signals from the detection device. These detection devices are also operated by being supplied with power.

However, it is not necessary to always scan the signals from the detection device, and it is sufficient to scan the signals only when necessary to operate each mechanism. However, conventionally, power is always supplied to the detection device, and the detection device operates meaninglessly during the time when scanning is not performed, resulting in an increase in power consumption.

[Objective] An object of the present invention is to provide a power-saving magnetic recording device with a detecting device that eliminates the above-mentioned conventional difficulties and suppresses the power consumption of each detecting device provided in each mechanical section.

[Solution Means] The present invention supplies power to the detection device at a time when it is necessary to scan a signal output from the detection device in order to operate each part of the magnetic recording device with the detection device. This is intended to reduce power consumption.

[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, writing, reading, and erasing data on a magnetic disk stored in a cartridge using the FM recording method, that is, writing,
As shown in FIG. 2, the magnetic head 1 that performs reading and erasing has a write amplifier 5 that controls the current flowing to the coils 3 and 4 wound around the yoke 2, and amplifies the signal read from the magnetic head 1. The read amplifier 5a is connected to the read amplifier 5a. Also,
The write amplifier 5 and the read amplifier 5a are 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 magnetic recording device 6. 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. and,
The carriage pulse motor 10 and the disk motor 11 that rotates the magnetic disk are driven by a motor driver 12.
2 is connected to the CPU 8 via a logic circuit 7. Also, for an index, that is, for detecting whether or not it is a break position where data starts in a track of a magnetic disk, and
a photo sensor mechanism 13 for detecting the position of the magnetic head 1, which detects whether the magnetic head 1 mounted on the carriage 9 is located at the outermost track position of the magnetic disk, that is, track 0;
A write protect mechanism 13a that detects a write-protection tab provided on a cartridge containing a magnetic disk is connected to the write protect mechanism 13a through a logic circuit 7.
Connected to CPU8. 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.

There is also 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 of reading, 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, and a buffer that temporarily stores data. The working RAM15 that works as a 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 selection is made between passing current from terminal 18 to terminal 19 and passing current from terminal 20 to terminal 19, depending on the data to be written. The configuration is such that the magnetic disk can be
It is now possible to write signals with different magnetization directions. In addition, when reading, that is, reading data written on a magnetic disk, a continuous line from terminal 18 to terminal 20 is
The structure is such that signals on the magnetic disk are read out as two coils. Furthermore, erasing, that is, erasing the data written on the magnetic disk, is configured to perform direct current magnetization only in the direction of magnetization at the end of the last write. The magnetization is caused by the gap 21 between the yoke 2 and the yoke 2a.
These two yokes 2, 2a are connected by a back bar 22 so that the magnetic flux is continuous, and sliders made of barium titanate are installed on both sides of the yokes 2, 2a at the contact surface with the magnetic disk. 23 are provided.

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. The core bar 24a of the magnetic disk is provided with a tracking hole 24b in addition to the central shaft hole, 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 and 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 on the magnetic head 1 with its center aligned with the spindle 24,
Furthermore, it is pressed against the magnetic head from above by a pad (not shown). 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. 5(a) shows the recording format for a magnetic disk. P is represented by an enumeration of 0 signals such as 0, 0, 0, ... in the pre-part, and the next S is represented by a start mark of 0, 0, 0, etc.
It is represented by 0, 0, 1, 0, 0, 0, 0. next
The length of the hard sector is written to HL, and the next
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 L ₁ , L ₂ , ... Lp, ..., Ln by the number of bytes corresponding to this logical sector length code LL, and specified by an external host device such as the computer 17, and the desired logical The configuration is such that data is written to sector Lp. The number of bytes corresponding to each logical sector length code LL is 64, 80, 128, 256,
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, file organization It is possible to increase the efficiency of The next IC is an ID field, that is, an area where CRC (Cyclic Redundancy Check) data of data from HL to R 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 a post section, which is represented by an enumeration of 0 signals 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 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 potential at the other end, the emitter of the transistor Q2 and the anode of the diode D3, is held at 0V. 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. . Further, a signal from the CPU 8 specifying the excitation phase is input to the input terminal 1 connected to the resistor R5.

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.

Furthermore, the circuits Ci1 and Ci2 are symmetrical with respect to the excitation coils L1 and L2, respectively. That is, for the circuit Ci1, the transistors Q1,
Transistors Q4 and Q are connected to Q2 and Q3, respectively.
5, Q6, diodes D1, D2, and D3 are connected to diodes D4, D5, D6, and resistors R1 and R, respectively.
2, R4, R5 have R3, R6, R7, respectively.
R8 and input terminal 1 correspond to 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 energization to the photo-opler 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, the process proceeds to step 148, and according to the determination of the command in step 147, if the command input from the computer 17 is an error, an error process is performed to output a signal indicating the error.
Initialization processing is performed in which ID field information and the like are written in advance on the magnetic disk, and areas where no data is listed with 0s, and processing for writing and reading data is performed. 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 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 the program goes to step 155 and stops energizing the write protection mechanism 13a, the program goes to step 156, where 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 13a, the process goes to step 158.
In step 152, the hard sector number written in the RAM 15 is read out, and seek is performed, that is, the magnetic head 1 is moved to the specified track. Next, proceed to step 159, where the disk motor 11 and index photocoupler 2 are installed.
8 is energized. Next, the process advances to step 160 and the read counter 15b is cleared. Next step 161
Then, 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 to the RAM 15. Next, the process proceeds to step 162, where power to the read amplifier 5a is cut off. Next, the process advances to step 163, and by referring to the remaining bits of the data written to the RAM 15 in step 161, excluding the last bit of the hard sector number data, the track where the magnetic head 1 is currently located is determined to be the target hard drive. It is determined whether the track has a sector or not, and if it is the target track, the process advances to step 164 in FIG. Output. Next, the process proceeds to step 165, where information specifying equally divided logical sectors Lp for writing data is received from the computer 17. Next, the process proceeds to step 166, where the address of the RAM 15 corresponding to the logical sector Lp designated by the computer 17 is determined. In this embodiment, the length of one divided logical sector Lp specified by the logical sector length code LL is divided by 1 from p to the logical sector number.
Multiply by the value obtained by subtracting
15 corresponding addresses are required. Next step
The process advances to step 167, where the data to be written to the magnetic disk is received from the computer 17, and written into the area of the RAM 15 specified by the address obtained in step 166. Next, proceed to step 168, then 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, the process proceeds to step 169, and as shown in FIG. 11 1a, the magnetic disk is located outside 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. Move the magnetic head 1 to

In the figure, the dashed lines indicate the centers of the n-1st, nth, and n+1st tracks, which are actually circular arcs, but are shown as straight lines to simplify the drawing. Also, the distance between the centers of each track is 6
Pulse length (375 μm). 1a and 1b show the positional relationship between the magnetic head 1 and the center of the track when erasing both sides of the center of the nth track one by one, and 1c shows the positional relationship between the center of the track of the magnetic head 1 when reading and writing. It shows the positional relationship of Further, the relationship between the (n+1)th track of the magnetic head 1 and the similar one 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 data currently corresponding to the magnetic head 1 is the target hard sector in which data is to be written, in synchronization with the index photocoupler 28, that is, the magnetic disk. A rotating body 25 that rotates by
This is done by detecting the output signal of the index photocoupler 28 that is interrupted on the side surface 25a of the index. 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 for halaying.
Perform erase. Next, the process proceeds to step 172, where the output signal of the index photocoupler 28, which is interrupted by the rotating body 25, is transmitted to the slit 26,
27 is detected and it is determined whether erasing of one hard sector of the magnetic disk has been completed or not. If not, 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 over the magnetic head 1, the 11th hard sector is
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, the process proceeds to step 174, where the magnetic head 1 is energized for erasing to perform erasing. Next, go to step 175 and
In the same way as 172, 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, proceed to the next step.
Proceed to step 176, stop energizing magnetic head 1, and
1. Return the magnetic head 1 to the center of the nth track as shown in FIG. 1c. 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, the corrected portion of the data written in the RAM 15 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 1 is added to the seek counter 15a of the PAM 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 or not the data in the hard sector specified by the read command has already been written in the RAM 15. If it has been written, there is no need to read it from the magnetic disk, which will be explained 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 completed. 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 you are still unable to read correctly, set magnetic head 1 to track 0 again.
After seeking to the desired track, seek again to the desired track and read. This read is also repeated up to three times until the read is performed correctly. 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, proceed to the next step 223,
The feed amount buffer 15c in the RAM 15 is set to a value corresponding to a feed amount greater than the target position to which the carriage 9 is sent by two steps in the carriage pulse motor 10, that is, two changes in the excitation current. Next, proceed to step 224 and proceed to RAM1
An excitation current is supplied to the carriage pulse motor 10 based on the excitation phase data of the excitation buffer 15d in the carriage pulse motor 10, 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 excitation buffer 1
5d, 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, in step 222, if 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, and 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, proceed to step 233,
Subtract one step from the feed amount buffer 15c. Next, proceed to step 234 and set the feed amount buffer 1.
It is determined whether 5c is 0 or not, and if it is 0, the process goes 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 that will send 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 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, and 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 direction opposite to the direction in which the next transition will be made, the position will be lower than the excitation position for the next transition. Since the excitation position in front of the carriage pulse 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 supply stabilized to 5V, so the dry battery B1
Even if the output voltage fluctuates due to consumption of 1, it is always almost constant. Therefore, even if the output voltage is higher than 3.6V because the dry battery B1 is new and not exhausted,
Since the transistor Q1 operates in the linear operation region, its impedance changes depending on the voltage between the collector and the emitter, and the left end of the excitation coil L1 is maintained at approximately 3.6V, and the voltage from the left end of the excitation coil L1 to the right end changes. A substantially constant current flows regardless of fluctuations in the output voltage of the dry cell 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 Co 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 corresponding to 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 described in detail above, the magnetic recording device with a detection device according to the present invention supplies power to the detection device that detects the state of each mechanical part and outputs a signal, depending on the signal from the detection device. It's time to scan. Therefore, meaningless operation of the detection device can be prevented, and power consumption can be kept low.

[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, Fig. 5b is a table explaining the logic sector, Fig. 6 is a diagram showing the excitation circuit of the carriage pulse motor, Fig. 7 is a flowchart showing the overall operation, and Figs. 8 to 10 are the write operations. 11 is a flowchart showing the positional relationship between the magnetic head and the track, and FIG. 12 is a flowchart showing the positional relationship between the magnetic head and the track.
13 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)

[Scope of Claims] 1. A control means for scanning at a predetermined time a detection device for detecting the rotational position of a rotating magnetic recording medium, the position of a magnetic head, and whether or not writing is possible on the magnetic recording medium, etc., the control means In a magnetic recording device equipped with a detection device that writes and reads data using a magnetic head that can move on the magnetic recording medium based on the scan results obtained by scanning the magnetic recording medium, the magnetic recording device includes a power supply control that controls the supply of power to the detection device. means is provided for each detection device, and the control means has a function of controlling the individual power supply control means so as to supply power to the scanned detection device when scanning the individual detection device. A magnetic recording device with a characteristic detection device.