JPH01179271A - Power source controller for recording medium reader/ writer - Google Patents

Abstract

PURPOSE:To prevent a recording medium from being damaged by a head by constituting a system is such a way that a power source is disconnected after the head is separated and displaced from the recording medium and is positioned at a waiting area. CONSTITUTION:When the power source is disconnected by a power source switch 6, a main control part 3 stops access to a hard disk device 7. At this time, a signal PON from the control part 3 goes to a low level. When the head 13 is not located on the waiting area in such state, the head 13 is moved to an area 16, and a disk control part 2 sets a signal SHIP at the low level. In such a way, since the output IPON of an OR circuit 4 goes to the low level, a cut-off state between the collector and the emitter of a Tr2 in a power source circuit 5 is generated, and the power source of a computer 8 is disconnected. As a result, the power source is disconnected only when the head is always set in the waiting state. Consequently, it is possible to prevent a disk from being damaged by the head in a case such as transportation, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to, for example, a hard disk drive (abbreviated as II
The present invention relates to a power supply control device for a recording medium reading/writing device, which is suitably implemented in a power supply controller of a device that reads and/or writes to a recording medium, such as a D D ).

In a prior art hard disk drive, the head is moved over the hard disk by a driving means to read/write data on the hard disk.
1 When the hard disk drive is not reading/writing, the head is not on the hard disk.
area, the so-called shipping zone.

In conventional hard disk drives, when the power is cut off, the head is not necessarily located in the standby area, but may be located on the hard disk.

That is, for example, when the power to the hard disk drive is forcibly cut off when reading/writing from/to the hard disk, the head normally remains positioned above the hard disk.

Problems to be Solved by the Invention In the prior art described above, if the power is cut off while the head of the hard disk drive is located in an area other than the standby area, the head of the hard disk drive will remain on the hard disk even after the power is cut off. remains in place. Therefore, if the hard disk drive is carried around in such a state, or if a shock is applied to the hard disk drive, the head may damage the hard disk and destroy data.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power control device for a recording medium reading/8-input device that solves the above-mentioned problems and prevents undesired data loss due to I-strokes and vibrations in a power-off state. That's true.

Means for Solving the Problems The present invention provides a recording medium read/write device in which a recording medium is driven and a head for reading or writing with respect to the recording medium is driven by a head driving means to move toward and away from the recording medium.
``The power control device for the JJ writing device includes: an operation switch for turning off the power source 31! of the recording medium reading/writing device; a detection means for detecting that the head has been displaced away from the recording medium and is in a standby area; and a head. and a switching element for supplying/cutting off power to the drive means, and the head drive means moves the head to a standby area when the operation switch is operated, and further detects the head after operation of the operation switch. A power supply control device for a recording medium reading/writing device, characterized in that a switching element is turned off in response to a detection signal from a means.

According to the present invention, in a power supply control device for a recording medium reading/writing device in which a head for reading or writing with respect to a recording medium to be driven is driven by a head driving means to move toward and away from each other, a recording medium reading/writing device is provided. When the operation switch is operated to cut off the power to the /l loading device, the head driving means moves the head to the standby area. Thereafter, the switching element supplies power to the head drive means until the detection means detects the completion of movement of the head to the standby area, and after detecting that the head is in the standby area, supplies power to the head drive means. Supply is 31! Cut off. Therefore, after the power is cut off, the head is located in the standby area.

Actual & 1rIA No. 1 I2I is a block diagram showing the configuration of a laptop-type computer 8 having a built-in hard disk device 7, which is an embodiment of the present invention. The laptop-type computer 8 performs various input/output controls and arithmetic processing.
It is configured to include a main control section 3 as a detection means, a power switch 6 as an operation switch, a hard disk device 7, and a power circuit 5.

The hard disk drive r1.7, which is an auxiliary storage means built into the computer 8, includes a hard disk drive section 1 and a disk control section 2, and performs read/write operations for data on the hard disk driven by the hard disk drive section 1. f% is controlled by the disk controller 2. The main +ff11 section 3 inputs and outputs data to and from the hard disk drive section 1 via the disk control section 2.

2I2I is a perspective view showing the configuration of the main parts of the hard disk drive unit 1. FIG. The hard disk 11 is the motor 12
Rotationally driven by. The head 13 is driven above the hard disk 11 in the direction shown by an arrow T'r15 by a head driving section 14 which is a head driving means. When a command to read or write data is output from the main control unit 3 to the hard disk device 7, the head 13 is driven on the hard disk 11 in the direction shown by the arrow 15, and the head 13 is driven in the direction indicated by the arrow 15 to form a pattern in the circumferential direction of the hard disk 11. 'pi'
Stop on one of several tracks.

Thereafter, data is written on a track on the rotationally driven hard disk 11, or data on this track is read.

If a data read/write command is not output from the main control section 3 to the hard disk device 7, a signal is output from the disk control section 2 to the head drive section 14, and the head 13 is driven to the standby area 16.

When the head 13 is located in the standby area 16, the processing circuit 9 included in the disk control section 2 outputs, for example, a low active signal SHIP to the OR circuit 4.

Further, the main control unit 3 is connected to a power switch 6,
By pressing the power switch 6, the main control section 3 controls the power on/off of the computer 8. When the power switch 6 is operated to cut off the power, the main control port 1
The processing circuit 10 included in the section 3 sets the signal PON to a low level and outputs it to the OR circuit 4. The output from the OR circuit 4 is given to the power supply circuit 5.

The power supply circuit 5 includes a transistor T which is a switching element.
rl, Tr2, and resistors R1, R2, and R3. The output of the OR circuit 4 is applied to the base of an NPN transistor Tri, for example, via a resistor R1. The base and emitter of the transistor Tr1 are connected through a resistor R2, and the emitter of the transistor Tri is grounded. The collector of the transistor Tri is connected to the base of, for example, a PNP type transistor Tr2 via a resistor R3. A constant voltage +■ is applied to the emitter of the transistor Tr2, and the hard disk device 7 and the like are powered by the output from the collector of the transistor Tr2.

FIG. 3 is a flowchart for explaining the operation when the computer 8 is powered off.

When the power switch 6 is pressed to cut off the power in step n1, the process advances to step n2. In step rr2, the main key (1 part 3 stops accessing the hard disk 'AC7'. At this time, step n3 At this time, the signal PON output from the main control section 3 becomes low level.

Thereafter, at the step entrance 4, the processing operation in the disk control section 2 branches depending on whether the spatula 13 is in the standby area 16 or not. If the head 13 is not in the standby area 16, the process moves to step n5 and the head 13 is moved to the standby area 16. Thereafter, the process returns to step n4, and it is determined whether the head 13 is in the standby area 16. If the head 13 is located in the standby area 16 in step n4, the process moves to step n6.

In step n6, the disk control unit 2 sets the signal 5HIP to low level. At this time, in step n7, the signal IPON output from the OR circuit 4 becomes low level since the signal 5HIP and the signal PON are at low level.

At step n8, since the signal I-- PON is at a low level, the collector-emitter of the transistor Tri is cut off. Therefore transistor T r 2
There is a block between the collector and emitter! Suddenly, the power to the computer 8 is cut off.

In this embodiment, when the power switch 6 is operated to cut off the power, the head 13 is moved to the standby area 16, and after detecting that it is in the standby area 16, the power to the computer 8 is cut off. . Therefore, when the power is interrupted, the head 13 is not located on the hard disk, and the head 13 may damage the hard disk 11 due to vibration or impact applied to the computer 8.
'$ that destroys data on hard disk 11
situation is prevented. Therefore, as in this embodiment, the present invention can be suitably implemented in connection with portable equipment such as a laptop computer 8.

Although this embodiment has been described in connection with a hard disk drive, the present invention may be implemented in connection with a read/write device for other recording media, such as a floppy disk drive, a magnetic tape read/write device, or a magnetic drum device. You can also do it.

Furthermore, in this embodiment, the hard disk drive 7 is equipped with a function of automatically moving the head 13 to the standby FI area 16 when there is no data access from the main control unit 3. When using a hard disk device that does not have such a function, when the power switch 6 is pressed to cut off the power by 3tA, the head 13 must be turned on before the signal PON is set to low level in the main control unit 3. The present invention can be implemented by outputting a control signal for moving to the standby area 16 to the disk controller 2, and then setting the signal PON to a low level.

Effects As explained above, according to the present invention, recording medium reading/
In the writing device, the power is cut off after the head is displaced away from the recording medium and positioned in a standby area. Therefore, after the power is turned off, the head is in a position separated from the recording medium, so it is possible to prevent the head from damaging the recording medium and destroying data on the recording medium. Therefore, the vibration resistance and I'll impact resistance of the recording medium reading/writing device can be improved.

[Brief explanation of the drawing]

No. 1121 is a laptop computer 8 having a built-in hard disk device 7, which is an embodiment of the present invention.
1 is a block diagram showing the configuration, 2nd is a perspective view showing the configuration of the main parts of the hard disk drive section 1, and FIG. 3 is a flow chart for explaining the operation when the computer 8 is powered off. DESCRIPTION OF SYMBOLS 1... Hard disk drive unit, 2... Disk control unit, 5... Power supply circuit, 6... Power switch, 7...
・Hard disk device, 8... Computer, 9...
・Processing circuit, 11...Hard disk agent Patent attorney Keiichi Shikyo Figure 2 Figure 3

Claims (1)

[Scope of Claims] A power supply control device for a recording medium reading/writing device, which drives a recording medium and drives a head for reading or writing with respect to the recording medium by a head driving means to move toward and away from the recording medium. An operation switch for cutting off power to the reading/writing device, a detection means for detecting that the head has moved away from the recording medium and is in a standby area, and a switching element for supplying/cutting off power to the head driving means. The head driving means moves the head to a standby area when the operation switch is operated, and after the operation switch is operated, the switching element is turned off in response to a detection signal from the detection means. A power supply control device for a recording medium reading/writing device, characterized in that: