JP2947310B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for writing or reading information using a disk such as a flexible disk.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show, for example, Shoji Takahashi, "From the basics to the application of all types of floppy disk drives / all types of FDD" (CQ Publishing Co., Ltd., November 1989).
FIG. 15 is an explanatory diagram showing the operating point range of the track 00 sensor of the conventional flexible disk drive shown in p99 to p100, in which A is a track number, and B is an excitation phase of a stepping motor. Numbers,
C is a range in which the output of the track 00 detection sensor changes. FIG. 5 shows the case of one-track two-step feed, and FIG. 6 shows the case of one-track one-step feed.

FIG. 7 shows, for example, Shoji Takahashi, “Latest Floppy Disk Drive and Its Application Know-how / Standard / Mini / Micro FDD System Basic Design / Utilization” (published June 10, 1984 by CQ Publishing Co., Ltd.) FIG. 12 is an internal configuration diagram showing the internal configuration of the conventional flexible disk device shown in p24.

In FIG. 7, 1 is a flexible disk device, 2 is a head, 3 is a flexible disk, 4 is a cassette detection sensor, 5 is a spindle motor, 6 is a stepping motor, 7 is a tooth attached to the stepping motor 6, 8 is A screw rotated by the stepping motor 6 and 9 is a track 00 sensor.

Next, the operation will be described. In FIG. 7, a carriage (not shown) on which the head 2 is mounted is moved by a screw 8 of a stepping motor 6, and a part of the carriage 00 is detected by a track 00 sensor 9 when the track 00 is a reference position .

As shown in FIGS. 5 and 6C, the output of the track 00 sensor 9 does not correctly change at the track boundary. Therefore, in order to detect whether or not the carriage is on the track 00, it is necessary to take a product with a signal that changes at the boundary of the track 00. Usually, a condition is used in which the excitation phase instruction signal of the stepping motor indicates the excitation phase of the track 00.

In order to adjust the operating point of the track 00 sensor 9 to the range C shown in FIGS. 5 and 6, it is necessary to move the track 00 sensor 9 and the stepping motor 6 shown in FIG. In the flexible disk device 1 shown in FIG. 7, the position of the track 00 can be finely adjusted by rotating the stepping motor 6 using the teeth 7 attached to the stepping motor 6.

[0008]

Since a conventional disk drive is constructed as described above, for example, in a recent flexible disk drive having a small capacity, a reference position can be adjusted by moving a stepping motor or the like. However, there is a problem that the shape of the motor is limited.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and provides a disk device capable of sufficiently securing a range in which a reference position can be adjusted even if an adjustment range of a mounting position of a stepping motor or the like is narrow. The purpose is to:

[0010]

SUMMARY OF THE INVENTION A disk drive according to the present invention is a disk drive in which a head is moved in a disk radial direction by a stepping motor and information is written to and read from the disk by the head. Changing means for changing an excitation phase instruction signal designating an excitation phase at the time of steady operation of the stepping motor to a signal designating another excitation phase in the designated excitation phase in accordance with a control signal set at the time. It is provided with.

When the two-phase motor is driven, the changing means includes a 1-bit control signal prepared separately for the excitation phase instruction signal of each phase and EX of the excitation phase instruction signal.
Means for calculating an exclusive-OR (OR), means for calculating the EX-OR of the two control signals, and indication of the excitation phase if the result of the EX-OR of the two control signals is 0 The EX-OR calculation result of the signal and the control signal is output instead of each excitation phase instruction signal. On the contrary, if it is 1, the EX-OR calculation result of the excitation phase instruction signal and the control signal is exchanged, and And means for outputting the signals in place of the respective excitation phase instruction signals.

[0012]

The changing means in the present invention drives the stepping motor by changing the output of the stepping motor excitation phase indicating circuit which is the input of the track 00 detecting circuit which has been conventionally used, so that the position of the actuator for detecting the track 00 is changed. It shifts. Therefore, even if the mounting position of the stepping motor is the same, the position of the actuator for detecting the track 00 can be adjusted with the resolution of the step movement amount of the stepping motor. Therefore, the position of the stepping motor only needs to be adjusted within a range smaller than the above-described step movement amount.

Further, since the inputs of the stepping motor excitation phase indicating circuit and the track 00 detecting circuit which are conventionally used are not changed, it is not necessary to change the circuits of these conventional parts. Therefore, the scale of the circuit to be added is small.

[0014]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG.
, 10 is a stepping motor excitation phase indicating circuit,
Reference numeral 11 denotes a track 00 detection circuit, reference numeral 12 denotes an excitation phase shift circuit as changing means for changing an excitation phase instruction signal for specifying an excitation phase of the stepping motor 6, and reference numeral 13 denotes a stepping motor drive circuit.

14 is an excitation phase initialization circuit, 15 is a step direction switching circuit, 16 is a step circuit, and 17 is EX-
An OR gate 18 is a switching circuit.

19 is an initialization signal, 20 is a step direction signal, 21 is a step signal, and 22 is a track 00 sensor 9
, 23 and 24 are excitation phase instruction signals, 25 is a track 00 signal, 26 and 27 are control signals, and 28 and 29 are outputs of the excitation phase shift circuit 12. 2 and 3 are explanatory diagrams of the operation of the excitation phase shift circuit 12. FIG.

The excitation phase initialization circuit 14 generates an initialization signal 19
Resets the excitation phase of the stepping motor 6 to a certain value. The step direction switching circuit 15 determines the direction in which the stepping motor 6 moves according to the next step signal 21 according to the step direction signal 20. Step circuit 1
6 is a step signal 21 which is a step direction switching circuit 1
The excitation phase corresponding to 5 is output.

The track 00 sensor 9 is located at the position of the carriage.
Is output near the track 00 which is the reference position . Here, a description will be given assuming that 0 is output near the track 00 and 1 is output at other times.

The track 00 detecting circuit 11
0 sensor 9 and excitation phase indication signals 23 and 2
4 is a combinational logic circuit. The track 00 signal 25 is set to 0 when the excitation phase indication signals 23 and 24 are the excitation phase of the track 00 and the output 22 of the track 00 sensor 9 is 0. The excitation phase shift circuit 12 switches the amount of deviation between the excitation phases of the excitation phase instruction signals 23 and 24 and the output excitation phase under the conditions of the control signals 26 and 27.

The operation of the exciting phase shift circuit 12 will be described with reference to FIG.
explain. E is the excitation phase instruction signals 23 and 24.
The horizontal axis indicates the position. D is the excitation phase of track 00And
The excitation phase instruction signals 23 and 24 are (1, 1).
F, G, H, and J are control signals 26 and 27, respectively.
(0,0), (0,1), (1,1), (1,0)
As shown in FIG.
Shows the outputs 28 and 29 of the exciting phase shift circuit 12 at the time.
I have.For example, the excitation phase indication signals 23 and 24 of E
In the case of (1, 1), the output 28 of the excitation phase shift circuit 12 and
29 is (1, 1) for F, (0, 1) for G, and H
(0, 0) and J are changed to (1, 0).

The relationship between the outputs 28 and 29 is the same as the relationship between the excitation phase indication signals 23 and 24, and these outputs 28 and 29 are shifted from the excitation phase indication signals 23 and 24 only in the horizontal axis direction. It can be seen that it is.
Therefore, by appropriately setting the control signals 26 and 27, the outputs 28 and 29 of the excitation phase shift circuit 12 can be shifted from the excitation phase instruction signals 23 and 24, and the position for detecting the track 00 can be changed. it can.

In the initialization by the excitation phase initialization circuit 14, the output 28 is maintained while maintaining the relationship with the excitation phase D of the track 00.
And 29 operate correctly because they only shift in the horizontal axis direction. Further, since the relationship between the order and the position of the excitation phases does not change, the step direction switching circuit 15 also operates correctly.
From the above, the stepping motor excitation phase indicating circuit 1
The configuration of 0 does not need to be changed.

FIG. 3 shows that the excitation phase indication signals 23 and 24 are fixed to the excitation phase D of the track 00, and the control signals 26 and 2
7 and the outputs 28 and 2 of the excitation phase shift circuit 12
9 and drive the stepping motor 6 to carry
Output of truck 00 sensor 9 when
2 and the change of the track 00 signal 25 .

When the carriage is moved by the stepping motor 6 and the output 22 of the track 00 sensor 9 becomes 0, the excitation phase is fixed at D, so that the track 00 signal 2
5 also becomes 0. At this time, a part of the carriage is within the operating point range C of the track 00 sensor shown in FIGS. 5 and 6, and if the control signals 26 and 27 are fixed in this state, the approximate adjustment of the track 00 position is completed. this
In the example, the control signal 26 = 0 and the control signal 27 = 1. Higher precision adjustment can be made at the position of the stepping motor 6 or the track 00 sensor 9 because the moving range is small.

Embodiment 2 FIG. Note that the exciting phase shift circuit of the above embodiment is replaced as shown in FIG. 30 is an AND gate, 31 is an OR gate,
32 is a NOT gate.

[0026]

As described above, according to the present invention, the track
Step according to the control signal set when adjusting the reference position of the
Excitation phase that specifies the excitation phase during steady-state operation of the motor
The instruction signal indicates another excitation phase among the excitation phases specified above.
Since it has a change means to change to the signal to be set, even if the range where the position of the stepping motor can be adjusted is narrow, the actual key
Effect an adjustment range of the position of Yarijji Ru sufficiently ensured
There is. In addition, since the size of the circuit to be added can be reduced, there is an effect that the device can be made inexpensive.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a flexible disk device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation of an excitation phase shift circuit 12.

FIG. 3 is an explanatory diagram of an operation of the excitation phase shift circuit 12.

FIG. 4 is an excitation phase shift circuit 1 according to another embodiment of the present invention.
FIG.

FIG. 5 is an explanatory diagram showing an operating point range of a track 00 sensor of a flexible disk drive of one-track two-step feed.

FIG. 6 is an explanatory diagram showing an operating point range of a track 00 sensor of a flexible disk device for one-track one-step feed.

FIG. 7 is an internal configuration diagram of a conventional flexible disk device.

[Explanation of symbols]

 Reference Signs List 9 track 00 sensor 10 stepping motor excitation phase indicating circuit 11 track 00 detection circuit 12 excitation phase shift circuit 13 stepping motor drive circuit 14 excitation phase initialization circuit 15 step direction switching circuit 16 step circuit 17 EX-OR gate 18 switching circuit 23 Excitation phase instruction signal 24 Excitation phase instruction signal 26 Control signal 27 Control signal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 21/08

Claims (2)

(57) [Claims] In a disk drive in which a head is moved in a disk radial direction by a stepping motor and information is written to and read from a disk by the head, the stepping is performed in accordance with a control signal set at the time of adjusting a reference position of a track. The excitation phase indication signal for specifying the excitation phase during the steady operation of the motor is included in the excitation phase specified above.
And a change unit for changing to a signal designating another excitation phase . 2. In a case where the stepping motor is a two-phase motor, the changing means includes an EX-OR (1 bit) of a control signal of 1 bit separately prepared for the excitation phase instruction signal of each phase and an EX-OR (EX-OR) of the excitation phase instruction signal. Means for calculating the exclusive-OR, means for calculating the EX-OR of the two control signals, and means for calculating the EX-OR of the two control signals if the result of the EX-OR of the two control signals is zero. The EX-OR calculation result of the signal is output instead of each excitation phase indication signal, and
2. The apparatus according to claim 1, further comprising means for exchanging the EX-OR calculation result of the excitation phase instruction signal and the control signal and outputting the result instead of each of the excitation phase instruction signals. Disk device.