JP2606529B2 - 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 floppy disk or a similar disk device.

[0002]

2. Description of the Related Art In order to achieve power saving of a floppy disk drive, there is a case where power is not continuously supplied to a read / write circuit or the like, but only during a period during which a motor-on signal is generated.

[0003]

Incidentally, it is desirable to reduce the power consumption of various sensors without being limited to the read / write circuit. However, since the disk sensor needs to always detect the loaded state of the disk, that is, the state of attachment / detachment, conventionally, a power supply voltage was continuously applied to the disk sensor. Therefore, power saving in the disk sensor was impossible.

It is therefore an object of the present invention to provide a disk device capable of saving power in a disk sensor, that is, a disk loading detection device.

[0005]

According to the present invention, there is provided a disk drive comprising a recording medium disk or a disk cartridge comprising a combination of a recording medium disk and a case. A disk drive configured to record or reproduce a signal by relative scanning movement of the disk drive, and having a disk loading detection unit for detecting the loading of the disk or the disk cartridge, wherein a power supply of the disk loading detection unit is provided. Power supply interrupting means for interrupting the voltage or the current at a period sufficiently shorter than the period during which the disk or the disk cartridge is loaded and the period during which the disk or the disk cartridge is not loaded; and detecting the disk loading by interrupting the power supply voltage or the current. Holding means for holding and outputting a detection signal intermittently obtained from the means. Those related to the disk device being.

[0006]

According to the present invention, since the power supply voltage or current is intermittently supplied to the disk loading detection device, no power loss occurs when the power supply voltage or current is turned off. Therefore, power saving is achieved by this amount. The disk loading detecting device detects the mounting / dismounting of the disk while the power supply voltage or the current is being supplied. By holding the detection result by the holding means, it is possible to continuously generate a signal indicating the mounting / dismounting of the disk. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a 3.5-inch floppy disk drive according to an embodiment of the present invention will be described with reference to FIGS. 3.5-inch disk cartridge 1 of FIG.
Comprises a case 2 and a recording medium disk 3 housed therein, and is removably mounted on a disk rotating device. The disk rotating device includes a motor 4 and a turntable 5. The turntable 5 has a spindle and a drive pin (not shown) to rotate the disk 3. A magnetic head (signal converter) 6 for scanning the disk 3 to record and reproduce signals is connected to a read / write circuit 7. A line 8 for supplying write data to the read / write circuit 7;
Line 9 for supplying a write gate signal (write enable signal) and line 1 for transmitting read data
0 is connected.

As a disk loading detecting means, a disk sensor 11, a resistor 12, a power supply voltage intermittent circuit 13 and a holding circuit 14 are provided. The disk sensor 11 includes a mechanical switch, and includes a switch 15 having a normally open contact configuration and an actuator 16 pressed by the cartridge case 2. The switch 15 is turned on while the cartridge 1 is inserted on the turntable 5. The cartridge 1 is turned on and is turned off when the cartridge 1 is removed from the turntable 5. One end of the switch 15 is connected to the power supply voltage interrupting circuit 13 via the resistor 12, and the other end is connected to the ground.

The power supply voltage intermittent circuit 13 includes the pulse generator 1
7 and a switch 18 which is turned on / off in response to this output.
And a power supply terminal 19. The switch 18 is composed of an electronic switch such as a transistor.
2 is connected between the first and second. The pulse generator 17 has a short period T1 and a narrow pulse width W as shown in FIG. 2B. The cycle T1 of the output pulse of the pulse generator 17 is determined by the loading periods t1 to t3 and the non-loading periods t3 to t5 of the disk cartridge 1 shown in FIG.
Is set much shorter than The loading period t1 to t3 of the disk cartridge 1 and the non-loading period t3 to t3
Although t5 is undefined, since the mounting and dismounting of the disk cartridge 1 is performed mechanically, t1 to t3 and t3 are usually used.
It is impossible or difficult to make t5 less than one second.
Therefore, the period T1 of the output pulse of the pulse generator 17 is 1
Set to seconds or less. This period T1 is preferably 1 ms to
It is set in the range of 1 s, more preferably in the range of 10 ms to 500 ms. In this embodiment, the period T1 is 100 m
s, and the pulse width W is 1 μs. The pulse width W needs to be set to be equal to or longer than the time width required for detecting the loading of the disk cartridge 1, and is selected from a range of, for example, 0.5 μs to 50 ms. In order to save power significantly, it is necessary to reduce the pulse width W as much as possible, that is, to reduce the duty ratio.

The holding circuit 14 includes a D flip-flop 20 as a latch circuit, a delay circuit 21, and an AND gate 22. The data input terminal D of the D flip-flop 20 is connected between the resistor 12 and the switch 15. One input terminal of the AND gate 22 is connected to the pulse generator 17, the other input terminal is connected to the pulse generator 17 via the delay circuit 21, and the output terminal is
It is connected to the clock input terminal C of the flip-flop 20. The delay circuit 21 delays the output pulse of the pulse generator 17 for a time shorter than the width W.

Next, the operation of the disk device of FIG. 1 will be described with reference to FIGS. 2A shows the loading (IN) and non-loading (OUT) of the disk cartridge 1, and FIG. 2B shows the output pulse of the pulse generator 17.
(C) shows the state of the output terminal Q of the D flip-flop 20. Since the intermittent switch 18 is turned on / off in response to the pulse shown in FIG. 2B, power is not continuously supplied to the switch 15. However, the output of the switch 15 during the pulse generation period (power supply period) is the D flip-flop 20. From the output terminal Q, the cartridge 1 is loaded (IN).
The output of FIG. 2 (C) substantially corresponding to the non-loading (OUT) can be obtained. When comparing FIGS. 2A and 2C, time differences of t1 to t2, t3 to t4, and t5 to t6 occur. However, the time difference is reduced by shortening the pulse period T1 of FIG. 2B. Can be reduced, so that there is no practical problem.

FIG. 3 shows the state of each part in FIG. 1 in detail, where (A) shows the output pulse of the pulse generator 17;
(B) is the ON / OFF state of the intermittent switch 18, (C)
Is the on / off state of the switch 15, and (D) is the delay circuit 2.
1, (E) shows the output of the AND gate 22, and (F) shows the Q output of the D flip-flop 20. (A) of FIG.
The switch 18 is turned on in synchronization with the pulse generation periods t1 to t3 shown in (1), and the power supply voltage is applied to the series circuit of the resistor 12 and the switch 15. Therefore, this period t1
~ T3 is the line 23 connected to the upper end of the switch 15.
, A signal indicating the state of the switch 15 can be obtained.
In the example of FIG. 3, since the switch 15 is off during the period from t1 to t3, the line 23 goes high, and this is the D flip-flop 2 at the leading edge time t2 of the pulse shown in FIG.
Reads to 0. The delayed output pulse shown in FIG. 3D is formed such that its leading edge is located during the period of generation of the pulse shown in FIG. When the delayed pulse and the non-delayed pulse are input to the AND gate 22, an output pulse shown in FIG. 3E is obtained, which becomes a clock signal of the D flip-flop 20. At time t4 in FIG. 3, the disk cartridge 1 is loaded on the turntable 5, the actuator 16 of the disk sensor 11 is pressed, and the switch 15 is turned on. This state is output from the pulse generator 17 to t.
When the intermittent switch 18 is turned on in response to the pulse shown in FIG. That is, at time t6, in synchronization with the leading edge of the clock signal applied to the D flip-flop 20, the low state signal on the line 23 is read into the D flip-flop 20 by turning on the switch 15, and the output of the D flip-flop 20 becomes t6. To indicate that the disk cartridge 1 is loaded. A signal indicating the loading / unloading of the disk cartridge 1 obtained from the D flip-flop 20 is sent to a known ready detection circuit and a known disk change signal forming circuit (not shown).

In this embodiment, W / T1 is 1 μs / 100.
ms, the power consumed by the circuit of the resistor 12 and the disk sensor 11 is 0.00
1%, and significant power saving is achieved.

[0014]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) In the embodiment, the switch 15 is turned on when the disc cartridge 1 is loaded. However, the switch 15 can be turned off when the disc cartridge 1 is loaded. (2) The disk detection circuit is connected to the disk cartridge 1
Can be configured to obtain a high-level signal when the device is loaded. In this case, for example, in FIG. 1, the sensor switch 15 is arranged at the position of the resistor 12, and the resistor 12 is arranged at the position of the sensor switch 15. In this case, the intermittent switch 18 can also move below the detection line 23 together with the resistor 12 to interrupt the current flowing through the resistor 12. (3) The present invention is also applicable to a case where the disk sensor 11 is constituted by an optical sensor composed of a combination of a light emitting element and a light receiving element. In this case, the power supply voltage of one or both of the light emitting element and the light receiving element is interrupted. (4) An amplifier including an open collector type transistor in the output stage instead of the switch 18, or a C-MOS
It is possible to use a buffer or an inverter composed of an IC having the configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a part of a floppy disk device according to an embodiment of the present invention.

FIG. 2 shows a disc cartridge, a pulse generator,
FIG. 3 is a diagram illustrating a state of a flip-flop.

FIG. 3 is a diagram showing a state of each unit in FIG. 1;

[Explanation of symbols]

 11 disk sensor 17 pulse generator 18 intermittent switch 20 D flip-flop

Claims (1)

(57) [Claims] 1. A disk cartridge comprising a recording medium disk or a combination of a recording medium disk and a case is removably mounted, and signals are recorded or reproduced by a relative scanning motion between the disk and a signal converter. And a disk device having disk loading detection means for detecting the loading of the disk or the disk cartridge, wherein the power supply voltage or current of the disk loading detection means is set to a value such that the disk or the disk cartridge is loaded. Power supply intermittent means for intermittently intermittently in a period shorter than a period during which the disk is loaded and a non-loading period, and holding and outputting a detection signal intermittently obtained from the disk load detecting means due to intermittent power supply voltage or current. And a holding unit for performing the operation.