JP2663511B2 - Magnetic recording device - Google Patents

Description

The present invention relates to a magnetic recording device such as a floppy disk using a magnetic disk.

[Prior Art] In the conventional magnetic recording apparatus, the detection of the 00 track and the latch operation were not performed in the change from the standby state to the operating state. Further, even when the 00 track detection and the latch operation are performed, the reciprocating operation of the track selecting means is not performed before the detection.

[Problems to be Solved by the Invention] In a conventional magnetic recording apparatus, a 00 track signal for determining a reference position of a magnetic head is determined by an excitation phase of a step motor.
It was formed by the logical product of the 00 track detection signals.
Recently, the excitation of the step motor has been switched between weak excitation and strong excitation to save power, and only when necessary when seeking.
A method has been adopted in which the track detecting means is energized and the signal at that time is latched. But the latched 00
When the track detection signal is used, when the magnetic head moves due to an impact or the like in the weakly excited state on the 00 track, the 00 signal is retained even though the track is not on the 00 track. In addition, the change from the weakly excited state to the strongly excited state
Even if the track detection signal is re-latched, the reciprocating operation of the track selection means must not be performed before the detection, and the normal seek operation will not be performed.
The detection latch is performed at a position different from the 00 track detection, so that an incorrect 00 track detection is performed. or,
When the magnetic head moves on track 00 due to an impact or the like, a normal method is to perform a re-calibration operation and recover from an error. However, if the 00 track signal is held, the re-calibration operation cannot be performed. Therefore, it is not possible to return from the error.

[Means for Solving the Problems] When 00 track detection is performed in the change from the weak excitation state to the strong excitation state, the 00 track detection during normal seek is performed by reciprocating the track selection means before the detection. Detecting latch can be performed at the same position as above, and correct 00 track detection can be performed.

[Operation] Even when the magnetic head is moved under a weak excitation state on the 00 track due to an impact or the like, the track selecting means performs a reciprocating operation before the detection to detect at the same position as the 00 track detection during normal seek. And correct 00 track detection can be performed.

[Examples] Hereinafter, the present invention will be described in detail based on examples.

FIG. 3 is a circuit diagram of a conventional example. When a signal STEP signal for instructing the movement of one track is input to the 28 phase control circuit blocks, PH1, PH2, PH3 and PH4 for determining the excitation phase of the step motor change according to the signal DIRECTION for instructing the movement direction. When the time generated by Q1 of the timer 1 of 27 has elapsed after the STEP signal is input to the outer peripheral direction and the 00 track detection signal 00in is active and the excitation phase of the 00 track, the D type 26 The 00out signal, which stores the state of the flip-flop and outputs to the host that the magnetic head is at the reference position, becomes active. Also, S
A signal POWER for switching the power of the step motor until the Q2 of the timer 1 is turned off after the TEP signal is input.
R becomes active. In a standby state in which either the MON signal or the CIN signal is non-active, 24 AND gates become non-active, and PH1 and P which are excitation phase outputs are output.
The AND gates 30 to 33 that allow the output of H2, PH3, and PH4 are closed, and the stepping motor is de-energized. When the standby state changes to an operation state in which both the MON signal and the CIN signal are active, the AND gate output of 24 becomes active and the output of the PH1, PH2, PH3 and PH4 is permitted.
Then, open the AND gate of 33 and the stepping motor is excited. However, when changing from the standby state to the operation state, the 00in signal is not re-latched again, and an erroneous 00out signal is output if the magnetic head is moved by an impact or the like in the standby state.

FIG. 1 is a configuration diagram of a control circuit in an embodiment of the present invention. FIG. 2 is a timing chart of the circuit shown in FIG.

A signal for instructing the movement direction when the STEP signal is input to the 18 phase control circuit blocks.
P that determines the excitation phase of the step motor according to DIRECTION
H1, PH2, PH3, PH4 change. STEP toward the outer circumference
When the signal is input, the output of the 8 D-type flip-flops becomes active. When the time created by Q1 of the timer 1 indicated by 17 has elapsed after the input of the STEP signal, the AND gate output of 11 which became active when the 00 track detection signal 00in is active and the excitation phase of the 00 track is changed to 14 00out which outputs to the host that the magnetic head is at the reference position.
The signal goes active. Further, the signal POWER for switching the power of the step motor becomes active until the Q2 of the timer 1 is turned off after the input of the STEP signal.

Either the signal MON for instructing the rotation of the spindle motor or the CIN indicating that the disk is mounted is inactive, the standby state is called a standby state, and the AND gate output of 9 becomes inactive and the excitation phase outputs PH1 and PH2 , PH
3. The AND gates from 1 to 4 that permit the output of PH4 are closed, and the step motor is de-energized. FIG. 2 shows the timing when the standby state changes to the operation state in which both the MON signal and the CIN signal are active. When the state changes from the standby state to the operation state, the signal A becomes active and opens the AND gates 1 to 4 which permit the output of the PH1, PH2, PH3 and PH4. If the 00out signal is active, the 10 AND gates become active, and the 15 timer 2 gives an operation. While the Q signal B of the timer 2 is active, the inverter 2 of 5 and the OR gate of 6 forcibly inhibit PH2 out of PH1 and PH2 which are the excitation phases of the track 00.
PH4 so that PH1 and PH4, which are the excitation phases of the truck, are output
Is output forcibly. When Q of the timer 2 is turned off, the excitation phases PH1 and PH2 of the 00 track are output again.
At the same time, 16 timers 3 start operating and the timer 3 Q1 signal C
12 OR gates change from LOW when changes from HIGH to LOW
HIGH and 14 D-type flip-flops
Latch the 00in signal again. When either the Q2 signal D of the timer 3 or the Q signal B of the timer 2 is HIGH, the OR gate at 13 becomes active and the POWER signal is held active. As described above, when changing from the standby state to the operating state on the track 00, the phase of the track 01 is first excited, and then the phase of the track 00 is excited.
The same operation as the seek to the track 00 is performed, and the 00in signal is latched again at the same timing as the normal seek. A correct 00out signal can be output. Also, by making the time of Q1 of the timer 1 and the time of Q1 of the timer 3 equal, the latch of the 00 track detection signal at the time of the normal seek operation and the re-latch of the 00 track detection signal at the time of the change from the standby state to the operation state are performed. Can be performed at the same timing, so that the detection position does not shift.

Furthermore, it is of course possible to combine some or all of the circuits to form an integrated circuit, and it is also possible to create a delay time by dividing the clock.

Although the example shown in FIG. 1 uses a two-phase excitation step motor, it is of course possible to use a one-phase excitation or 1-2 phase excitation step motor.

[Effects of the Invention] As described above, according to the present invention, the stepping motor is controlled at a plurality of excitation levels to reduce the power consumption of the stepping motor and to prevent heat generation. In addition, erroneous detection of 00 track due to vibration can be prevented, and accurate 00 track detection can be performed in the magnetic recording apparatus, so that a high quality magnetic recording apparatus can be manufactured at low cost. This is particularly significant for applications requiring small size and light weight.

[Brief description of the drawings]

FIG. 1 is a block diagram of a step motor control circuit according to an embodiment of the present invention, and FIG. 2 is a timing chart of FIG. FIG. 3 is a configuration diagram of a conventional step motor control circuit. 15… 01 Timer to determine the track excitation time 16 …… 00 Timer to determine the track detection timing and POWER UP time 17 …… 00 Timer to determine the track detection timing and POWER UP time 18 …… Sets the excitation phase according to the STEP signal and DIRECTION signal. Phase control circuit block to determine 27 ... 00 Timer to determine track detection timing and POWER UP time 28 ... Phase control circuit block to determine excitation phase according to STEP signal and DIRECTION signal

Claims (2)

(57) [Claims] 1. A magnetic disk, a rotation driving means for rotating a magnetic disk medium, a magnetic head for reading and writing, a reading and writing circuit, a track position of the magnetic head, and a holding function by a plurality of excitation levels. In a magnetic recording apparatus comprising a track selecting means having a 00 track detecting means for detecting and latching a specific position of a track, the track selecting means changes from a weak excitation in a standby state to a strong excitation in an operating state. A magnetic recording apparatus which performs a reciprocating operation of the track selecting means, and then performs detection and latching by the 00 track detecting means. 2. The magnetic recording apparatus according to claim 1, wherein the weak excitation state is non-excitation.