JPS63102065A - Disk device - Google Patents

Abstract

PURPOSE:To reduce a cost by providing a circuit which stops the supply of a rotation command signal in response to the fact that an angle position detection pulse is not generated from an angle position detection means during a prescribed period in spite of generating the rotation command signal for a drive motor. CONSTITUTION:When a cartridge 1 is inserted into a disk device whose power source is turned on, a photodetector 38 changes to a non light-receiving state from a light receiving state, and an output changes from low to high level. In synchronization with the leading of a from low to high level. In synchronization with the leading of a file protect sensor 36 to a high level, a differentiation circuit 35 generates a trigger pulse to raise the output of an OR gate 27 to a high level. Even if a motor on signal shows stoppage, the driving of a motor 14 is started. If a disk 2 is parted from a rotational base before the output of a ready detection circuit 41 becomes ready for preparation, the output of the ready detection circuit 41 disables a stoppage control. However, in parting the disk 2, a counter 31 generates a low level pulse in t5 to reset a flip flop 34, the motor is stopped. Thus the constitution is simplified and its cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk device for recording and/or reproducing data, and more particularly to a disk device that can reduce costs and save power.

[Conventional technology and its problems]

2. Description of the Related Art Floppy disk devices that record and reproduce data using magnetic disk cartridges, generally called floppy disks, are widely used. This type of device has an optical disk sensor for detecting the attachment and detachment of the disk, and when the ejection of the disk is detected, the Dinuk motor is controlled to stop.

Providing a disk sensor everywhere will inevitably increase costs. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk device that is capable of operating substantially the same as when a disk sensor is provided, even though the cost is reduced by not providing a disk sensor. .

[Means for solving problems]

To achieve the above object, the present invention includes a rotary table on which a recording medium disk is detachably mounted, a disk motor coupled to the rotary table, a drive circuit for the motor, and a rotary table mounted on the rotary table. and an angular position detection means for generating an angular position detection pulse at a predetermined period during the rotation period of the disk, and a means for rotating the disk motor. In a disk drive including a motor rotation signal supply means for supplying a command signal to the drive circuit, the rotation command signal for the disk drive motor is generated from the motor rotation signal supply means. A disk device characterized in that a circuit is provided for stopping the supply of the rotation command signal to the drive circuit in response to the fact that the angular position detection pulse is no longer generated from the position detection means at a predetermined period. It is.

[For production]

In the above invention, the attachment or detachment of the disk is detected using the output of the rotational angular position detection means (C index sensor) provided in the disk device, and when the angular position detection pulse (C index pulse) is likely to occur, it is considered that the disk has detached. The disc motor is controlled to stop. Therefore, it is possible to control the motor in the same way as when a dedicated disk sensor is used.

〔Example〕

Next, a 70-tube disk device according to an embodiment of the present invention will be explained with reference to FIGS. 1 to 4. FIG. 1 shows a disk cart generally called a 5.25-inch floppy disk for recording and reproducing data (IJ-read/write). The disk cartridge fi+ is made up of a flexible magnetic disk (2) and a jacket (3), as is clear from FIGS. +51.The index holes (5) provided on the upper and lower main surfaces of the jacket (31) are provided corresponding to the passage positions of the index holes (41) of the disc (2), so the disc (2) During one rotation of the disc (2), the hole (4) of the disk (2) and the hole (5) of the jacket (3) coincide in plan view, and light is allowed to pass through.

(61 is the index sensor, jacket (3)
A light emitting element (71) disposed on one main surface of the disk (2) facing the hole (4) and a light receiving element (8) disposed on the other main surface of the disk (2). The light-receiving element (8) is a phototransistor, and its emitter is grounded and its collector is connected to the positive power supply terminal via a resistor (9), so that light is emitted from the light-emitting element (7). The light passing through the hole +41+51 reaches the light receiving element (
8), the output line (111) becomes low level (L
) during the rest of the year, and remains at a high level during other periods.

α2 is a disk rotating table, which holds the center of the disk (2) and rotates it. U is a clamper, which is rotatably supported by a swinging arm (not shown);
The disk (2) is selectively fixed on the turntable (12+).

(2) is a disk motor, which is connected to the rotary table α2. This motor (141) is driven by a control and drive circuit a□51.The field is a magnetic head for data recording and reproducing, and a stepping motor 081 is used together with a carriage 0η.
The disk (2) is moved in the radial direction by.

The container a9 shown in principle has an opening (2) for installing and removing a cartridge, and various components such as the motor rotor 41 are accommodated therein.

The QIl consists of a host device, a CPU, a controller, etc., and supplies a motor-on signal via a line.
Line c! 3+241 (4o receives the index pulse, ready signal, and write protection detection signal.Although not shown in the figure, there is also a signal between the head (161) and many,
The host device (2I) supplies control signals for the stepping motor a&.

In conventional general disk drives, the motor-on signal on line @ is directly supplied to the control and drive circuit t151VC, but in this embodiment, a line is connected between line c221 and the control and drive circuit (15+) to control the motor-on signal. ni, N
07 circuit (c), AND gate (2), and OR gate end are provided in sequence. One input terminal of the AND gate Q61 is connected to the line inlet via a NOT circuit, and the other input terminal is connected to the stop control flip-flop 7'' (i, therefore)IJpfr:ytsy The motor ON signal is AND gate (A) only during the period when the upper side is set.
pass through.

The stop control flip-flop (to) is controlled by the output of the index sensor (6), NOT' times jl! 5 kan.

OR type AND gate ■, counter C3L as 10 second timer, clock pulse generation eG'2J, AN
A D gate (to) is provided. OR type AND
One input terminal of the gate (to) is connected to the index sensor output line 0υ via the NOT circuit, and the other input terminal is connected to the output terminal of the OR gate (27).
The output terminal is connected to the reset terminal R of the counter Gυ. Therefore, the index detection pulse is blank only during the period when the signal commanding the rotation of the motor (141) is generated.
input to the printer Gυ. A clock pulse generator c32 is connected to one input terminal of the AND gate □□□, and the output terminal of the OR gate (5) is connected to the other input terminal.The output terminal is connected to the clock terminal CK of the counter c31). It is connected. Therefore, the clock pulse is input to the counter 011 only during the period when the motor rotation command signal is being generated. The Q output terminal of the counter (elf) is connected to the reset terminal of the stop control flip-flop. In addition, the flip 70 knob (to) is an OR type NAND that requires 3 people.
AND gate a) and two-man OR type NANDAN
D gate b) consists of OR type NA on the set side
The first input terminal of the ND gate (28a) is an N07 circuit (c), the second input terminal is an N07 circuit, and the third input terminal is an OI (type NANDAND gate b).
is connected, and the reset side is an OR type NAND game)
The first input terminal of (28b) is an OR type NAND
(28a), and the second input terminal is connected to the Q output terminal of the counter c31+.

(Foundation) is a flip-flop for motor rotation control when disc clamping, and is a two-man OR type NANDAN.
D gate a) and 3-person OR type NAN D case
) (34b). The first input terminal of one NANDAND gate a) of this flip 70 tube is connected to the file protection sensor (
), and the second input terminal is connected to the other NANDAN
It can be connected to D gate b), and the output terminal is OR gate) (2
7). The first input terminal of the NANDAND gate b) is connected to the NANDAND gate 4a), the second input terminal is connected to the ready detection circuit c3η, and the third input terminal is connected to the counter c311.

File protection sensor (to) is! As shown in Figure 2, this is a device that optically detects the presence or absence of the recording protection detection notch (3a) in the jacket (31).
The light emitting element c37) placed on the side of the
) and a light-receiving element (3) disposed on the other side of the disc (3a), and is positioned so as to correspond to the notch (3a) when the disc is mounted. The light receiving element (to) consists of a phototransistor with a grounded emitter, and its collector is connected to a resistor 09.
is connected to the positive power supply via the output line (
4G has a low level when receiving light and a high level when not receiving light.

The ready detection circuit 0υ is connected to the index sensor (6) and generates a signal indicating the ready state (II-ready state for read/write) when the generation cycle of the index detection pulse becomes less than a certain time. It is configured. Note that this ready detection circuit αυ may be constructed with a timer that measures the time when a certain period of time has passed since the start of rotation of the disk (21).

C operation) Next, when the signal on line ■ indicates the rotation of motor 041, move the disk (2) to the rotating table
The operation when separated from + will be explained with reference to FIG. Now, at time t1, the motor ON signal in Fig. 3 (4) is the motor α
If the level reaches a low level that commands the rotation of the opposition, motor α4 starts rotating in response to this, and 12,
As shown at t3 and t4, a low-level index detection pulse is generated from the index sensor (6) every time the disk (2) rotates.At t4, the index detection pulse becomes less than a predetermined period, so the ready detection circuit (41
If the output of 1 is at a low level (ready state) as shown in Figure 3 (O), data can be recorded and reproduced. Figure 3 (
As shown in 4), when the disk (2) is ejected from the rotating table a2 at 15 while the motor on signal is in a low level (on command) state.

As shown in FIG. 3, the output of the index sensor (6) continues to be at a low level. ff[lchi, light emitting element (7
Since the disk (2) and jacket (31) are not interposed between the light receiving element (81) and the light receiving element (81), the light input power is always applied to the light receiving element (8). It is configured to count up to a certain period of time (10 seconds), taking into account the maximum occurrence period.
It is configured to generate a low level output pulse when counting seconds. Therefore, if the index detection pulse is generated before 1sFR is 1-.

It will be reset before 10 seconds are counted, and 1
0 second count output or no output. On the other hand, if the index detection pulse is no longer generated after t5, the counter c31)
is not reset, a 10-second count output pulse is generated at 16, 10 seconds after t5, as shown in Figure 3, and this is supplied to the stop control flip-flop 70, causing the output of the flip-flop 2 to become low. become the level. Therefore, the output of the AND gate becomes low level, and
The output of the R gate (A) becomes a low level at t6 as shown in FIG. 3, and the motor I is turned off. Therefore, when the disk (21) is not installed, the motor a is stopped from rotating, and power saving is achieved.When the disk (2) is installed on the rotary table in step 17, the index sensor (6
) returns to a high level, and in response to this, the flip 70 knob is set and the motor α4 rotates.

Insert the power-on disk drive into the arrow (421
When the cartridge (1) is inserted in the direction shown, the jacket (31) crosses the file protection sensor. Therefore, the light-receiving element (to) changes from the light-receiving state to the non-light-receiving state, and the output changes from a low level to a high level. The differential circuit generates a trigger pulse shown in Fig. 4 (■) in synchronization with the rise of the output of the file protection sensor ω to a high level.
41 is set as T shown in FIG. 4(G), and a high level output is obtained. Therefore, the output of OR game)C)7) becomes high level as shown in Figure 4 (■), and even though the motor ON signal is at a high level (stop command) as shown in Figure 4, motor α The opposition begins to rotate. In this embodiment, the configuration 1 is such that when an output indicating ready is generated from the ready detection circuit (4υ), the rotation of the motor 041 is controlled to be stopped in order to save power.
121 is rotated in order to properly center the disk (2) with respect to the rotating table (121).By the way, before the disk (2) reaches a predetermined rotational state, that is, at
When the disk (2) detaches from the rotary table 02 at 14 before the output of the ready detection circuit 0υ, which detects the ready state using index detection pulses such as 2° and 13, becomes a low level (ready state), It becomes impossible to perform stop control using the output of the ready detection circuit. However, the disk (
21 is removed (C eject), the output of the index sensor (6) continues to be at a low level, and from 14 to 1
After 0 seconds, at 15, a low-level pulse is generated from the counter C31) as shown in Figure 4 ■, the flip-flop is reset as shown in Figure 4 Ω, and the motor σ slope is on the stop side? I can do it with MJ. After that, when the disk (2) is inserted at t6, the flip-flop (b) is set again, the motor α rotates, and if the disk (2) is not removed, the ready detection circuit is activated at 17! The output of 4D becomes a low level (ready state) K, and if the motor on signal is maintained at a high level at this time, the motor α4 is controlled to stop.

[Modified example]

The present invention is not limited to the embodiments described above, but may be modified. For example, instead of resetting the flip 70 (2) with the output of the ready detection circuit 0υ, it is better to reset the flip 70 in the pre-ready state just before reaching the ready state. In other words, the counter Gυ and the clock pulse generator p21''v may not be provided independently, but may be shared with other circuits.Also, in general, a microfloppy disk (3,5
It is also applicable to disk devices that use what is called an inch floppy disk. In this case, since the index hole (4) is not provided, an index made of, for example, a magnet piece is provided on the rotor of the motor (141), and this is detected by a magneto-electric conversion element such as a Hall element, and the index is detected by a magneto-electric transducer such as a Hall element. All you have to do is know the rotation angle position.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to control the stop when the disk is detached without providing a dedicated disk sensor, and the structure can be simplified and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a disk device according to an embodiment of the present invention, and FIG. 2 is a plan view showing a cartridge. 3 and 4 are waveform diagrams showing the states of each part in FIG. 1. fi+... Cartridge, (2)... Disc, (
4) - Index hole + +61... Index sensor size, f7+... Light emitting element, (81... Light receiving element, ■... AND gate, OD... Counter. Procedural amendment (self-proposed) August 1988 10th of the month

Claims (1)

[Claims] (1) A rotary table on which a recording medium disk is removably mounted, a disk motor coupled to the rotary table, a drive circuit for the motor, and detecting the rotational angular position of the disk mounted on the rotary table. angular position detection means that generates an angular position detection pulse at a predetermined period during the rotation period of the disk; and a motor that supplies the drive circuit with a command signal for rotating the disk motor. Rotation signal supply means; In a disk drive comprising: a rotation command signal for the disk drive motor is generated from the motor rotation signal supply means; A disk device comprising a circuit that stops supplying the rotation command signal to the drive circuit in response to no longer generating angular position detection pulses.