JPH0380460A - Index signal generator for disk driving device - Google Patents

Abstract

PURPOSE:To shorten the adjusting time by providing a mechanical position signal generating means and an index signal generating means and storing plural sets, each having a time data and an identification data showing the change of its time as a set, in a ROM. CONSTITUTION:The mechanical position signal S1 is supplied to a universal counter 2 from an input terminal T1, and the index signal S2 is supplied to an input terminal T2. The time M from generating of the mechanical position signal to the generating of the index signal is counted by the counter 2 and outputted to a subtractor 3. The data D1 of the time M and the data D2 of an offset time F from an input terminal T3 are supplied to the subtractor 3, where the calculation of M-F is performed. The data D3 of M-F and the data D4 of a clock period tau from an input terminal T4 are supplied to a divider 4, where the calculation of (M-F)/tau is outputted to an output terminal T5 from the divider 4. This data is supplied to a memory 6 in a system controller 5 to be written there. By this method, addressing can also be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an index signal generating device for a disk drive device suitable for application to a microfloppy disk drive device.

C. Summary of the Invention] The present invention relates to an index signal generation device for a disk drive device, and includes a mechanical position signal generation means for generating a mechanical position signal according to the rotation of a motor that rotationally drives a disk;
A ROM that can be written only once stores data from the time when the mechanical position signal is generated until an index signal indicating the reference angular position of the disk is generated. and an index signal generating means for generating an index signal after the elapse of the time, and the ROM can store a plurality of sets of time data and identification data indicating that the time has been updated. Since the device is provided with a storage area, it is possible to accurately and easily adjust the deviation in the generation timing of the index signal after replacing the motor, etc., and to shorten the time required for the adjustment. It was made so that it could be done.

[Conventional technology]

A microfloppy disk with a diameter of 3.5 inches has
Since an index hole such as that provided in a floppy disk having a diameter of 5.25 inches is not provided, it is not possible to extract an index signal indicating the reference angular position of the disk in accordance with the rotation of the floppy disk.

However, in the case of a microfloppy disk, the core metal is provided with a center hole and a drive hole located away from the center, and the spindle and drive pin that are rotationally driven by the rotor of the motor of the drive device are connected to these holes. Since the disk is fitted into the center hole and the drive hole to rotate the disk, the motor is provided with a mechanical position signal generating means and an index signal generating circuit to generate the mechanical position signal. By defining the time from when the index signal is generated until the index signal is generated, it is possible to generate an index signal that indicates the reference angular position of the disk.

By the way, even if the time from when a mechanical position signal is generated to when an index signal is generated is specified when manufacturing such a drive device, if the motor of the drive device is replaced, the mechanical position signal The occurrence timing of the index signal becomes incorrect, and therefore the occurrence timing of the index signal itself also becomes incorrect. In that case, it is necessary to adjust the generation timing of the index signal.

Therefore, in the past, the position of the mechanical position signal generation means was adjusted, and the time from the generation of the mechanical position signal to the generation of the index signal was determined by the amount of delay of a variable delay circuit that was removed from the resistor and capacitor. I was making adjustments.

[Problem to be solved by the invention]

In such conventional examples, the former requires a fairly large machine (capable of automatic adjustment) and has the disadvantage that the adjustment takes a considerable amount of 9 hours.

In the latter case, adjusting the amount of delay is complicated, and
Since the amount of delay changes depending on temperature characteristics, it is difficult to accurately regulate the timing at which the index signal is generated.

In view of this, the present invention is capable of accurately and easily adjusting the time from when a mechanical position signal is generated to when an index signal is generated, and also to shorten the time required for the adjustment. This paper attempts to propose an index signal generating device for a disk drive device that can perform the following functions.

[Means to solve the problem]

The present invention includes a mechanical position signal generating means (23) that generates a mechanical position signal according to the rotation of a motor (16) that rotationally drives a disk, and a reference angle of the disk after the mechanical position signal is generated. A ROM (6) that can be written only once to store data for the time until the index signal indicating the position is generated, and a ROM (6) that can be written only once,
index signal generating means (7) for generating an index signal after the time written in (6) has elapsed;
The ROM (6) is provided with a storage area capable of storing a plurality of sets of time data and identification data indicating that the time has been updated.

[Effect]

According to the present invention, the ROM (
6) Write data on the time from generation of the mechanical position signal to generation of the index signal and identification data indicating that the time has been updated. Then, the latest time data is read from the ROM (6), and based on it, the time from the time when the mechanical position signal is generated to the time when the index signal is generated is accurately determined.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a microfrosby disk drive device will be described in detail below with reference to the drawings.

First, with reference to FIG. 4, the mechanical structure of the flow-novy disk drive device and the mechanical position signal generating means provided therein will be explained. (10) is the spindle,
(11) are drive bins, 3 and 5, not shown, respectively.
It fits into the center hole and drive hole provided in the core metal of an inch floppy disk. Spindle (1
0) is integrally attached with a turntable (13), and a drive bin (13) is mounted on the turntable (13).
1) is installed, and a magnet (12) for attracting the core metal of the floppy disk is attached.

The spindle (10) is rotatably attached to the chassis (15) via a bearing (14).

(16) shows a motor, which includes a rotor magnet (17) integrally attached to the spindle (10) via a magnet holding part (19), and a substrate (20) facing the rotor magnet (17). The stator coil (1
8).

(23) shows a mechanical position signal generating means for the rotation of the motor, which is connected to a magnet (24) attached to the circumferential surface of the magnet holding part (19) of the rotor and a magnet (24) close to the rotation orbit of this magnet (24). It consists of a Hall element (25) provided as follows. Note that this Hall element (25) is attached to the substrate (20) via a Hall element holding part (26).

In addition to the magnetic means, the mechanical position signal generating means (23) may be constituted by optical means consisting of a light emitting element and a light receiving element.

(21) and (22) are positioning bins, and chassis (15)
) and a substrate (20), the top of which abuts the floppy disk cartridge. It should be noted that two more positioning bins are provided in addition to those shown in the figure.

Next, the electrical configuration of the floppy disk drive will be explained with reference to FIG. (5) is a system controller for the driving device including a microcomputer, and a part thereof is provided with an index signal generation circuit (7). A mechanical position signal from the mechanical position signal generating means (23) in FIG. 4 corresponding to the rotation of the motor (16) that rotationally drives the disk is supplied from the input terminal T7 to the index signal generating circuit (7>). Then, the timer counter built in the index signal generation circuit (7) starts counting, and when the predetermined timer time elapses, the circuit (7) starts counting.
) is configured such that an index signal is outputted from an index signal forming circuit (consisting of a monostable multi-bi-break circuit, etc.) built in the device through an output terminal T8.

And the timer time of this timer counter is the memory,
That is, one-time ROM such as FROM, fuse ROM, etc.
In (6), it is stored as the number X of clock signals (its clock period is τ) that are supplied to the timer counter and counted.

(1) is a measuring device that measures data X to be stored in the above-mentioned memory (6). This measuring device (1) will be explained below. (2) is a universal counter in which a mechanical position signal from a mechanical position signal generating means (23) is supplied to an input terminal T, an index signal is supplied to an input terminal T2, and these mechanical position signals are generated. After that,
By measuring the time M until the index signal is generated,
Output the data at time M.

(3) is a subtracter, which is supplied with time M data from the counter (2) and offset time F data from the input terminal T3, and performs the calculation of MF.

(4) is a divider, and here the time (
The data of M−F) and the data of clock cycle τ from the input terminal T4 are supplied, and the calculation of (MF)/τ is performed.

Then, the data of the number of clock signals x=(MF)/τ is outputted from the divider (4) to the output terminal T5. The data of this number x-(M-F)/τ is input to the input terminal T
6, it is supplied to the memory (6) of the system controller (5) and written therein.

Next, the operation of this measuring device (1) will be explained. for example,
Assume that the motor (16) of the drive device in FIG. 4 is replaced with a new one. First, using a floppy disk on which a reference index signal is recorded, the reference index signal reproduced from the floppy disk (Fig. 2C
) is supplied to the input terminal T2 of the counter (2), and a mechanical position signal (see FIG. 2B) from the mechanical position signal generating means (23) is supplied to the input terminal T1 of the counter (2). The time MO (-M-
F) is calculated.

Next, the index signal (pre-adjustment index signal) from the output 1 child Tθ of the system controller (6) (second
(see Figure C) to the input terminal T2 of the counter (2), and a mechanical position signal from the mechanical position signal generating means (23) to the input terminal 1 of the counter (2), The time M from when the mechanical position signal (see FIG. 2B) is generated until when the pre-adjustment index signal is generated is calculated. Then, offset foot time F=M-MO is determined from this time M and time M□.

Then, in the subtracter (3), the calculation of MF is performed,
The divider (4) calculates (M-F)/τ to obtain the number of clock signals x = (M-F)/τ, and writes this to the memory (6) of the system controller (5). .

Thus, the number X of clock signals is loaded into the timer counter of the index signal generation circuit (7). Therefore, when the mechanical position signal (Fig. 2B) is supplied from the input terminal T7 to the index signal generation circuit (7),
Based on this, the timer counter starts counting clocks having a clock period τ, and when counting X clocks,
A timer signal is output from the timer counter, and based on this, an index signal (adjusted index signal) (FIG. 2D) is output from the output terminal T8.

Next, the data of the number of clock signals
The operation of writing to and reading from the data will be explained. Figure 3A
As shown in FIG. 1, the memory (6) is provided with seven storage areas capable of storing, for example, 6 bits of data, and each address is set as follows, for example.

1” yo ooooo.

00001 00011 00111 01111 11111 11111 In the unstored state, the data of each bit is, for example, “0” (“1” is also possible). Then, the MSB-1 to LSB of the 6-bit data are assigned to the data of the number of clock signals X, and the MSB is assigned to identification data indicating that the number of clock signals X has been updated.

Now, when manufacturing a floppy disk drive, as shown in FIG. 3B, the MSB is 1'', and the MSB-1 to
For example, 6-bit data whose LSB is "01001" is written to the first 6-bit storage area.

Also, when replacing the motor afterwards, as shown in Figure 3C,
, the MSB is “1” and the MSB-1 to LSB are “0”, for example.
Write the 6-bit data of 0110'' into the next 6-bit storage area.

Thereafter, when the motor is replaced, etc., 6-bit data is sequentially stored in the 6-bit storage area of the memory (6).

In the system controller (5), the microcomputer sequentially reads out the MSB data of each storage area of the memory (6) from top to bottom in FIG. 3, and the read output changes from "l" to "O", the address M at the last 11"
Data from SB-1 to LSB is read out, used as data for the number of clock signals X, and loaded into a timer counter.

Also, if data for the number of clock signals X is recorded up to the last storage area of this memory (6), the MSB is “
1", and the address is "111111", so it can be easily detected.

Therefore, as the memory (6), an inexpensive one-time RO
M can be used. Furthermore, addressing when writing to and reading from the memory (6) becomes extremely easy.

〔Effect of the invention〕

According to the present invention described above, it is possible to accurately and easily adjust the time from the generation of the mechanical position signal from the mechanical position signal generation means to the generation of the index signal, and the time required for the adjustment. It is possible to obtain an index signal generating device for a disk drive device which can shorten the time and reduce the cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the electrical fjI of the embodiment of the present invention, FIG. 2 is a timing chart for explaining its operation, FIG. 3 is an explanatory diagram showing writing of data to memory, and FIG. 4 FIG. 2 is a sectional view showing the mechanical configuration of an embodiment of the present invention. (1) is a measuring device, (2) is a universal counter, (
3) is a subtracter, (4) is a divider, (5) is a system controller, (6) is a memory (one-time ROM), (
7) is an index signal generation circuit, (16) is a motor,
(17) is the rotor magnet, (18) is the stator coil, (
23) is a mechanical position signal generating means, (24) is a magnet, (
25) is a Hall element. Proxy Hidemori Matsukuma Example Fig. 1 Timing chart Fig. 2 Mesori explanation Fig. 3

Claims (1)

[Claims] Mechanical position signal generating means for generating a mechanical position signal according to the rotation of a motor that rotationally drives a disk; and after the mechanical position signal is generated, a reference angular position of the disk is determined. a ROM that can be written only once and stores data for the time until the index signal shown in the table is generated; and an index signal generating means that generates the index signal after the time written in the ROM has elapsed after the mechanical position signal is generated. The ROM is characterized in that the ROM is provided with a storage area capable of storing a plurality of sets of data on the time and identification data indicating that the time has been updated. Index signal generator for disk drive.