JP2644715B2 - Disk unit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive using a disk-shaped storage medium such as a floppy disk. 2. Description of the Related Art Conventionally, storage devices such as magnetic tapes and magnetic disks have been widely used as external storage devices for computers. However, recently, small-sized storage devices such as minicomputers and microcomputers have been used. As a relatively simple type of external storage device for a computer, a storage device using a magnetic sheet disk, a so-called floppy disk, has come to be used frequently. FIG. 1 shows an example of such a floppy disk drive. This figure shows a mini-size floppy disk device as an example, wherein 1 is a floppy disk device accommodated in a protective jacket, 2 is a floppy disk device, and 3 is a portion into which the floppy disk 1 is inserted. The door provided at the entrance. When using this apparatus, the door 3 is opened, and the floppy disk 1 is inserted into the apparatus while being stored in the jacket.
When the button is closed, it is set to an operable state. FIGS. 2 (a) and 2 (b) show an example of a disk driving method of such a floppy disk drive. FIG. 2 (a) shows a floppy disk drive by opening a door 3 (FIG. 1). After inserting the door 1, the door 3 is not yet closed, and FIG.
(b) shows a state in which the door 3 is closed thereafter, and in these figures, 4 is a centering cone, 5
Is a center hole of the floppy disk 1. In addition, 1 'is a jacket of the floppy disk 1. The centering cone 4 has a conical shape as the name implies, and rotates with its outer peripheral surface fitted into the center hole 5 of the disk 1 to serve as a drive shaft for driving the disk 1 to rotate. is there. Since the centering cone 4 moves in the axial direction in conjunction with the opening and closing of the door 3, when the disc 1 is inserted and the door 3 is closed, the state shown in FIG. When the door 3 is opened, the state shown in FIG. 2 (b) is automatically returned to the state shown in FIG. 2 (a). Accordingly, the centering cone 4 fits into or separates from the disk 1 simply by opening and closing the door 3, and when the door 3 is closed, as shown in FIG. This means that the motor is automatically set to a state in which it can be driven to rotate. Next, FIG. 3 shows a state in which the disk 1 is rotationally driven by the centering cone 4, and 6 is a driving motor. Therefore, when writing information to the floppy disk 1 and reading information from the floppy disk 1, the floppy disk 1 is driven to rotate by the drive motor 6, and necessary information is written and read. . Since such a floppy disk 1 is driven to rotate while being housed in a jacket 1 ', it is necessary to house the floppy disk 1 with a relatively large margin in the jacket 1'. Floppy disk 1
When the disk is inserted into the floppy disk device and set at a predetermined position, the center of the floppy disk 1 and the center of the jacket 1 'may be shifted from each other as shown in FIG. Often occurs. In this state, when the door 3 is closed and the centering cone 4 is to be fitted into the center hole 5 of the disc 1, the end of the centering cone 4 is moved to the disc 1 as shown in FIG. The centering cone 4 fits into the center hole 5 of the disk 1 while bending and deforming that portion, so that the inner peripheral portion of the center hole 5 of the floppy disk 1 is wavy deformed. Or
There is a possibility that the center hole 5 is deformed into an elliptical shape. At this time, if the centering cone 4 is rotating, the end of the cone 4 is
When the disk 1 comes into contact with the periphery of the center hole 5, the disk 1 moves and the center hole 5 and the center of the cone 4 coincide with each other, that is, the so-called self-centering function works. There is no fear that the vicinity of the center hole 5 of the disk 1 is deformed. However, as described above, a storage device using a floppy disk, particularly a mini-size floppy disk, is mainly used for a small and simple computer or the like, and thus may be small and low cost. Therefore, a DC motor is mainly used as the driving motor 6. As a result, in such a floppy disk device, a drive motor start / stop control circuit is provided in the floppy disk device as shown in FIG. 5 in consideration of the life of the driving motor, and a strobe signal from a computer or the like is provided. Therefore, the control circuit is operated to drive the floppy disk only when writing and reading information, and to stop the drive motor at other times. In FIG. 5, reference numeral 6 denotes a motor for rotating the drive cone 4 already described, 7 denotes a start / stop control circuit, 8 denotes a holding circuit, and 9 denotes a motor drive circuit. The start / stop control circuit 7 generates a start signal in response to a command from a computer or the like when writing or reading information, and supplies the start signal to the holding circuit 8. The signal held in the holding circuit 8 is supplied to a motor drive circuit 9, and the motor 6 rotates to drive the floppy disk 1 via the drive cone 4. When the writing and reading of information are completed,
Since the control circuit 7 supplies a stop signal to the holding circuit 8, the output of the holding circuit 8 disappears and the motor 6 stops. Accordingly, in this conventional floppy disk device, the centering cone does not rotate when the floppy disk is inserted, so that the floppy disk is easily deformed and damaged as described above. In addition, there are disadvantages such as inconvenience in handling such as the skill of inserting the floppy disk, which requires skill, and loss of valuable information due to shortened life of the floppy disk. In order to eliminate the drawbacks of the prior art, the rotation of the floppy disk drive motor is controlled by detecting the floppy disk insertion operation, and the drive motor automatically rotates when the floppy disk is inserted. A floppy disk drive has been proposed,
Hereinafter, this device will be described with reference to FIG. 6. In FIG. 6, reference numeral 10 denotes an open / close detection circuit for the door 3 (FIG. 1), and reference numeral 11 denotes a logical sum circuit. The motor start / stop circuit 7, holding circuit 8, motor drive circuit 9 and the like are the same as those in the conventional example of FIG. The door opening / closing detection circuit 10 generates a pulse signal (b) when the door 3 starts to be opened and then closed, and supplies a start signal to the holding circuit 8 via the OR circuit 11. Accordingly, the output from the holding circuit 8 is supplied to the motor drive circuit 9, so that the drive motor 6 rotates and drives the centering cone 4 to rotate. For this reason, as shown in FIG. 1, when the door 3 is opened, the floppy disk 1 is inserted, and then the door 3 is closed, the drive cone 4 (FIGS. 2 to 4) immediately starts rotating. Therefore, for example, even if the center of the center hole 5 of the floppy disk 1 and the center of the centering cone 4 are slightly shifted as shown in FIG. 4A, the shift is corrected by the self-centering action described above. As shown in FIG. 3, it is possible to prevent damage to the vicinity of the center hole 5 of the floppy disk 1 due to the proper fitting. Next, this device will be described in more detail with reference to FIGS. In FIG. 7, 12 is the door 3
A switch which is turned off when opened and turned on when closed, 13 is a monostable multivibrator (mono multi),
14 is an OR gate, 15 is a flip-flop (FF), 1
6 is a power transistor. Next, the operation will be described with reference to the time chart of FIG. As shown in FIG. 1, when the door 3 of the floppy disk drive 1 is opened, the switch 12 is turned off. On the other hand, at this time, as a matter of course, no information is written or read, so that the output (c) of the start / stop control circuit 7 remains at the low level. Next, when the floppy disk 1 is inserted and then the door 3 is closed, the switch 12 is turned on, so that the output (a) thereof becomes low level. The mono-multi 13 is triggered by the fall of the output (a), and the output (b) becomes high level. Then, the output (b) becomes the output (d) through the OR gate 14, and the FF 15 is set. As a result, the output (e) becomes high level, the transistor 16 is turned on, and the drive motor 6 starts rotating. Accordingly, the inserted floppy disk 1
When the centering cone 4 tries to fit, the centering cone 4 is always rotating, and when the inserted floppy disk 1 is in the state of FIG. 2A, the self-centering effect is effective and the fitting is always performed in a correct state as shown in FIG. 2B. Also, the floppy disk 1 is not damaged. After the floppy disk 1 is inserted, a signal (c) from the control circuit 7 is sent to the FF 15 via the OR gate 14 to control the start and stop of the motor 6. However, these FIG. 6
In the apparatus described with reference to FIG. 8, no consideration is given to the control of the floppy disk drive motor when the power of the floppy disk apparatus is turned on, and the power supply of the floppy disk apparatus is maintained while the floppy disk is inserted. When the floppy disk is inserted, the floppy disk drive motor starts to rotate immediately, so that the life of the floppy disk is shortened. That is, in the floppy disk device, since the information writing / reading head is always in contact with the information recording surface of the floppy disk, the floppy disk drive motor rotates while the floppy disk is inserted. After that, the information writing / reading head of the floppy disk device is kept in contact with the information recording surface of the floppy disk until a certain specific Since the rotation is continued while being positioned on the track, the sliding time of the head on the same track is lengthened, the probability of occurrence of damage to the recording medium is increased, and the life is shortened. An object of the present invention is to provide a long-life and high-reliability disk device in which damage to a disk-shaped storage medium such as a floppy disk is sufficiently suppressed. An object of the present invention is to provide a motor for rotating a disk-shaped storage medium, a motor driving means for driving the motor, and a power supply means. In a disk device that performs at least one of writing information and reading and reproducing information recorded on the disk-shaped storage medium, reset signal output means for outputting a reset signal when power supply is started from the power supply means, A first operation of controlling the motor driving means in response to the input of the reset signal to maintain the rotation of the motor in a stopped state, and controlling the motor driving means at a predetermined access from a computer to rotate the motor. This is achieved by providing control means for executing a second operation for performing control. The reset signal operates so that the floppy disk drive motor does not start rotating just by turning on the power to the floppy disk device. Therefore, the rotation of the information writing / reading head of the floppy disk device is not continued while the head is positioned on the same track, and the life of the floppy disk can be sufficiently extended. Hereinafter, a method for controlling a disk drive according to the present invention will be described in detail with reference to the illustrated embodiment. 9 and 10 show an embodiment of the present invention.
FIG. 10 is a block diagram showing the entire configuration, and FIG. 10 is a specific circuit diagram of a part thereof.
Reference numeral 20 denotes an RS flip-flop (RSFF) for reset priority with clear input, reference numeral 21 denotes a centering completion detection circuit, and reference numeral 22
Is an exclusive OR circuit (EXOR). The floppy disk 1, the centering cone 4, the center hole 5, the drive motor 6, the motor drive circuit 8, the door open / close detection switch 12, and the like are the same as those in FIGS. The RSFF 20 is cleared by a clear signal (h) given from a computer or the like when the floppy disk drive is powered on and put into an operable state, and then a signal (a) from the switch 12. And is preferentially reset by the signal (g) from the EXOR 22, so that the operation is as shown in the logic table of FIG. In FIG. 11, H indicates a high level signal, L indicates a low level signal, and X indicates that the input state is H.
But it shows that it has nothing to do with it. And No. The Q in 5 indicates that the previous state is preserved. The centering completion detecting circuit 21 mainly has a switch which operates when the centering cone 4 is fitted into the center hole 5 of the floppy disk 1 and reaches a predetermined position. The signal (f) is maintained at the power supply voltage, that is, H, when the voltage does not reach, and becomes a contact voltage, that is, L when the centering is completed and reaches a predetermined position. Next, the operation will be described with reference to the time chart of FIG. First, when the power of the floppy disk drive is turned on, a signal (h) which is at a low level for a certain period as shown in FIG. 12 (h) is supplied to the clear terminal CLR of the reset priority RSFF 20 by a power reset circuit (not shown). No. of FIG. As shown in FIG. 1, the output signal Q of the FF 20 becomes a low level as shown in FIG. 12 (e), which is supplied to the motor drive circuit 8 as a signal (e), and the motor 6 is set to a stopped state. At this time, since the signals (a) and (g) applied to the input terminals S and R of the RSFF 20 are both at a high level, FIG. As shown in FIG.
Since the output signal (e) of the SFF 20 is maintained at a low level, the motor 6 is also maintained in a stationary state. Next, when the floppy disk 1 is inserted into the floppy disk device 2 and the door 3 is closed, the door switch 12 functions to operate the RSFF 20 as shown in FIG.
The set input signal (a) of FIG. At this time, the output Q of the RSFF 20 is No. of FIG. 2 to a high level as shown in FIG. 12 (e), and this signal (e) is supplied to the motor drive circuit 8, so that the motor 6
Starts rotating, and the centering cone 4 also starts rotating.
On the other hand, when the door 3 is closed, as described with reference to FIG.
To the center of the floppy disk 1 with the rotation axis of the floppy disk device, that is, the centering cone 4, but in the case of this embodiment, the centering cone 4 rotates while rotating. 4A, the centering of the floppy disk sheet can be performed without damaging the floppy disk sheet even when the hole 5 is displaced from the centering cone 4 as shown in FIG. Action can be performed. Because the centering cone 4 is rotating, when it comes into contact with the floppy disk 1,
This is because the disk is immediately started to rotate, so that a so-called self-centering effect is achieved by the action of the centrifugal force or the like, as described above, in which the center of the center hole 5 and the rotation axis of the centering cone 4 coincide. The centering cone 4 inserted into the hole 5 of the floppy disk 1 moves the switch of the centering completion detecting circuit 21 from the position indicated by the solid line in FIG. 10 to the position indicated by the broken line in FIG. As a result of such movement, since the switch is grounded, the upper input terminal of the exclusive OR circuit 22 is dropped from the high level to the low level as shown in FIG. The lower input terminal of the exclusive OR circuit 22 is dropped to a low level only when the floppy disk device is externally accessed by the signal (c). Therefore, the output (g) of the exclusive OR circuit 22 falls to a low level as shown in FIG. On the other hand, at this time, the input of the RSFF 20 is
No. in FIG. 4, the output (e) of the FF 20 falls to low level, so that the input signal to the motor drive circuit 8 falls to low level as shown in FIG. Be stopped. Therefore, by closing the door 3 of the floppy disk device, it is understood that the motor 6 that has started to rotate automatically stops after completing the centering operation of the inserted floppy disk 1. . Thereafter, after the above-described operation is completed, unless the door 3 of the floppy disk drive is opened, the R
Since the set input S of the SFF 20 is maintained at a low level, No. 1 in FIG. 2, No. As shown in FIG. 4, when the reset input R of the FF goes high, the output Q also goes high and the motor 6 rotates, and when the reset input R goes low, the output of the FF goes low. Since Q also becomes low level, the motor 6 stops. Then, the output of the centering completion detection circuit 21 is maintained at a low level. Then, if the access signal (c) of the floppy disk drive is lowered to low level, the output of the exclusive OR circuit 22 becomes high level, and the motor 6 is rotated.
Conversely, when the signal (c) is raised to a high level, the output of the circuit 22 becomes low level and the motor 6 can be stopped, and the motor 6 is rotated only when accessing the floppy disk device as in the conventional case. be able to. Therefore, according to this embodiment, even if the power is turned on while the floppy disk is still inserted in the apparatus, the floppy disk is not used until a predetermined access is made from the computer. Since the rotation of the disk can be reliably inhibited, unnecessary wear of the recording medium of the floppy disk can be reliably prevented, and the life of the floppy disk can be sufficiently extended. In the above embodiment, when the floppy disk is inserted, the centering cone is automatically rotated to activate the centering function, and after the centering is completed, the drive motor is stopped for the first time, so that reliable centering is always obtained. Since the present invention is applied to a floppy disk device that can be used, the rotation of the floppy disk can be sufficiently limited only to the time of centering and the time of writing and reading information by accessing the computer. Unnecessary wear of the recording medium can be surely suppressed, the rotation time of the drive motor can be surely suppressed only for a necessary period, and there is no risk of damage when the disc is inserted. Therefore, the life of the floppy disk and the drive motor can be sufficiently extended. The above embodiments are directed to a floppy disk device in which the floppy disk 1 is driven by the centering cone 4, but the present invention is not limited to FIG. As shown in
Drive cup 2 rotationally driven by a driving motor
It is needless to say that the present invention can be similarly applied to a floppy disk apparatus of a type in which the floppy disk 1 is rotationally driven so that the floppy disk 1 is sandwiched between the cup 25 and the centering cone 4 using the disk 5. . As described above, according to the present invention,
Even if the power is turned on while the disk-shaped storage medium is still inserted in the apparatus, the rotation of the disk can be surely prohibited until a predetermined access is made from the computer, so that the floppy disk drive can be used. Unnecessary wear of the recording medium of the disk can be reliably prevented, the life of the floppy disk can be sufficiently extended, and the following excellent effects can be obtained. Since unnecessary rotation of the disk drive motor can be eliminated, power saving can be reliably achieved, and the usable time of a power source such as a battery can be greatly extended. In a disk device, when a disk is inserted, its information writing / reading head is always in contact with the information recording surface of the disk. Therefore, if the disk is inserted and left unattended, the head and the information recording surface of the disk may be stuck. When the disk starts rotating in this state, the information recording surface of the disk is destroyed. However, according to the present invention, the disk does not start to rotate only by turning on the power of the disk device, so that it is possible to give an opportunity to remove the disk from the disk after the power is turned on and before the rotation starts. Accordingly, the probability of damaging the disk can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a floppy disk device. FIG. 2 is an explanatory diagram showing a relationship between a centering cone and a floppy disk and a centering operation in a normal state in the floppy disk device. FIG. 3 is an explanatory diagram showing an example of a centering cone drive system in the floppy disk device. FIG. 4 is an explanatory diagram showing a problem of a centering operation in the floppy disk device. FIG. 5 is a block diagram of a control circuit in a conventional example of a floppy disk drive. FIG. 6 is a block diagram showing an example of a floppy disk device in which a drive motor is rotated when a floppy disk is inserted. FIG. 7 is a circuit diagram showing an example of a floppy disk device in which a driving motor is rotated when a floppy disk is inserted. FIG. 8 is a time chart for explaining an operation of an example of a floppy disk device in which a drive motor is rotated when a floppy disk is inserted. FIG. 9 is a block diagram showing an embodiment of a disk drive according to the present invention. FIG. 10 is a circuit diagram showing an embodiment of a disk drive according to the present invention. FIG. 11 is a logic diagram for explaining an operation in the embodiment of the present invention. FIG. 12 is a time chart for explaining the operation in the embodiment of the present invention. FIG. 13 is an explanatory diagram illustrating an example of a drive mechanism of the floppy disk device. [Description of Signs] 1 Floppy disk 2 Floppy disk device 3 Door 4 Centering cone 6 Driving motor 7 Motor start / stop control circuit 8 Holding circuit 9 Motor drive circuit 10 Door open / close detection circuit 11 OR circuit 12 Door open / close detection switch 20 Reset priority RS flip-flop with clear input 21 Centering completion detection circuit 22 Exclusive OR circuit

Continuation of front page    (72) Inventor Shigeru Komatsu               292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa               Hitachi, Ltd. (72) Inventor Mikiaki Kobayashi               292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa               Hitachi, Ltd.

Claims (1)

(57) [Claims] A motor for rotating and driving the disk-shaped storage medium; a motor driving means for driving the motor; and a power supply means, for writing information to the disk-shaped storage medium and for writing information recorded on the disk-shaped storage medium. A disk device that performs at least one of read and reproduction; a reset signal output unit that outputs a reset signal when power is supplied from the power supply unit; and a motor that controls the motor drive unit based on the input of the reset signal. A first operation for maintaining the rotation of the motor in a stopped state, and control means for executing a second operation for controlling the rotation of the motor by controlling the motor driving means at a predetermined access from the computer side. A disk device characterized by the above-mentioned.