JPH0325348Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk drive device that sends and receives various information signals to and from the signal recording surface of a disk-shaped signal recording medium (hereinafter referred to as a "disk").

[Conventional technology]

2. Description of the Related Art Disk drive devices in which a plurality of disks are hermetically housed in a housing have been known as storage means in various office automation devices. This kind of disk drive device houses a magnetic head for recording and reproducing signals, a driving means for driving these disks, etc. in a housing housing a disk, and the signals sent and received via the magnetic head are , through the input/output terminals provided on the housing, communication is made with host machines such as the various office automation devices mentioned above.

In addition, recently, in order to obtain large storage capacity in certain types of office automation equipment,
As shown in FIG. 4, a plurality of disk drive devices 2, 2, . . . 2 may be installed and used in one office automation device 1.

In such a case, one of the disk drive devices 2, 2...2 is appropriately selected by the host computer 3 provided in the office automation equipment 1, which is the host machine, and
Any of these disk drive devices 2, 2...
Signals are exchanged between the disks 4, 4, . . . , housed in the host computer 3, and the host computer 3. In this case, the unselected disk drive device 2,
2...2 was placed in non-operational mode to save power.

[Problems that the idea should solve]

By the way, as mentioned above, since the conventional disk drive devices 2, 2, . There was a problem.

Particularly, in a disk drive device that uses a relatively heavy disk, there are problems in that it takes more time to rotate the disk at a constant speed and the initial power consumption increases.

[Means for solving problems]

The present invention has been made in view of the above-mentioned circumstances, and aims to provide a disk drive device that can quickly respond to selection and maintain low power consumption.

In order to achieve this object, the present invention allows the host machine to send and receive signals to and from the disk 10, on which tracking servo signals _St are embedded at predetermined pitches on the signal recording surfaces 101 and 102, as shown in FIG. In a disk drive device, the selection is controlled by the mode selection signal S ₁ supplied from the OR gate circuit 12 and the signal readout circuit 11 is turned off to be in a non-operating mode when the mode selection signal S ₁ is not selected. At the same time, a servo gate pulse P _g synchronized with the output period of the tracking servo signal S _t is supplied to the other input terminal of this OR gate circuit 12. The present invention is characterized in that the signal readout circuit 11 is turned on and off by supplying the output S _g to the signal readout circuit 11.

[Effect]

In a disk drive device configured as described above, even when this disk drive device is not selected, the gate output S _g is output during the servo gate period.
Accordingly, the signal readout circuit 11 can be put into the operation mode and a tracking servo operation can be performed. Thereby, tracking servo can be applied even when not selected, and response speed when selected can be increased.

Furthermore, since the signal readout circuit 11 is turned off except during the servo gate period when not selected, power can be saved.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.

On the signal recording surfaces 101 and 102 of the disk 10, which is a signal recording medium, a tracking servo signal S _t and each sector are recorded at a predetermined pitch as schematically shown in FIG.
S _e1 , S _e2 . . . Data signals DATA of ₁₆ minutes each are recorded alternately to form a concentric recording track T _r .

The above-mentioned tracking servo signal S _t is recorded by displacing two types of pulse train signals P ₁ and P ₂ having different frequencies by 1/2 track width W in the tracking direction, that is, in the direction of arrow A, as shown.

In addition, each of the sectors S _e1 , S _e2 ... S _e16 contains a synchronization signal Sync, an index signal ID in which address marks AM, cylinder numbers CYLH, CYLL, head signals HD, sector numbers SEC, etc. are recorded.
A data signal DATA consisting of an information signal Data, an error correction code ECC, etc. is recorded.

Each signal recording surface 101, 10 of this disk 10
The transmission and reception of signals to and from the device 2 is performed via a pair of upper and lower magnetic heads 13, 13 provided in a signal readout circuit 11, and this signal readout circuit 11 outputs the read signal via a pulse detector 14. Terminal 1
Supply to 5.

Further, this signal readout circuit 11 is turned on and off by the gate output S _g of the OR gate circuit 12.
The mode selection signal S ₁ is supplied from the host device 1 to one input terminal of the OR gate circuit 12 via the input terminal 16 . Here, this mode selection signal _S1 is a binary signal that specifies whether or not the host machine 1 uses this disk drive device as a signal transmission/reception partner, and in this embodiment, the mode selection signal S1 is a high-level signal.
It is selected when it is low, and it is unselected when it is low.

Note that in this embodiment, the mode selection signal
S ₁ is also supplied to the pulse detector 14, and High
This pulse detector 14 is turned on when
It is designed to turn off when

Further, the other input terminal of the OR gate circuit 12 is supplied with a servo gate pulse P _g outputted from a pulse generator 17 in synchronization with the output cycle of the tracking servo signal S _g .

And the gate output of this OR gate circuit 12
The signal readout circuit 11 is turned on when S _g is High, and turned off when S g is Low.

On the other hand, the reproduced output signal S ₂ output from the signal readout circuit 11 is the servo gate pulse P _g
Switching circuit 18 controlled on and off by
is supplied to Here, the above servo gate pulse
Since P _g is synchronized with the output cycle of the tracking servo signal S _t as described above, only the tracking servo signal S _t in the reproduced output S ₂ is sampled and supplied to the servo circuit 19 .

This servo circuit 19 is composed of, for example, two band filters, a detector, a differential amplifier, etc., and outputs an error signal S _e corresponding to the reproduction output ratio of each of the pulse train signals P ₁ and P ₂ to an output terminal 20. The tracking servo is applied by supplying the head to the access motor for moving the head via the head.

In the disk drive device configured as described above, the magnetic heads 13, 13 receive a tracking servo signal S _t and a data signal as shown in FIG. 3a.
Outputs playback output _S2 consisting of DATA.

Further, the pulse generator P _g outputs a tracking servo signal of the reproduction output S ₂ as shown in FIG. 3b.
Outputs a servo gate pulse P _g synchronized with the output cycle of S _t . A mode selection signal _S1 is supplied from the input terminal 16 as shown in FIG. 3c. Therefore, the OR gate circuit 12 supplies the gate output S _g as shown in FIG. 3d to the signal readout circuit 11 to turn it on and off.

As a result, the signal readout circuit 11 supplies a reproduced output as shown in FIG. Further, the signal readout circuit 11 in the non-selected state L is turned on only during the servo gate period t and outputs only the tracking servo signal S _t .

Note that during this non-selection, the pulse detector 14 is always turned off.

Further, the switching circuit 18 is turned on and off by the servo gate pulse P _g and supplies only the tracking servo signal S _t to the servo circuit 19 . This servo circuit applies tracking servo based on the supplied tracking servo signal S _t .

As described above, in the disk drive device according to this embodiment, the pulse detector 1 is
4 is turned off, and the signal readout circuit 11 is also turned off except during the servo gate period t. For this reason,
Significant power savings can be achieved. That is, according to the applicant's experiments, the power consumption during the servo gate period t when not selected is 4.3 [W], while the power consumption during periods other than the servo gate period t is 1.8 [W].
I was able to hold it down to [W].

Also, the servo gate period t is 60 [μsec], while the period other than the servo gate period t is 1520 [μsec].
Therefore, when the power consumption is 4.3 [W], the total power consumption is 4.
[%] (60/4520), which is a significant power saving compared to the case where all circuits are turned on for the entire period.

Furthermore, in the disk drive device according to this embodiment, the tracking servo is always applied regardless of whether it is selected or not selected, so the magnetic heads 13, 13 are always on-track. The response speed when selected can be increased.

The signal reading circuit 11 is also turned on during reading by a control signal supplied from the host machine 1 via a signal line (not shown), and supplies the information signal DATA to the magnetic heads 13, 13. be.

[Effect of idea]

As is clear from the above description, according to the present invention, response performance (access time) can be improved while maintaining low power consumption by applying the tracking servo when the host machine does not select.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing the basic configuration of the present invention, FIG. 2 is a schematic diagram showing a signal recording format on a disk-shaped signal recording medium housed in a disk drive device according to the present invention, and FIG. 3 is also a time chart showing the operating status. FIG. 4 is a schematic diagram showing the relationship between a general host machine and a disk drive device. 1...Host machine, 10...Disk, 101,
102...Signal recording surface, 11...Signal readout circuit, 12...OR gate circuit.

Claims (1)

[Scope of utility model registration request] The transmission and reception of signals to and from the disk-shaped signal recording medium, in which tracking servo signals are embedded at predetermined pitches on the signal recording surface, is selectively controlled by the mode selection signal supplied from the host machine.When not selected, the signal readout circuit is turned off. In a disk drive device that is set to non-operational mode, the above mode selection signal is
A servo gate pulse synchronized with the output cycle of the tracking servo signal is supplied to one input terminal of the OR gate circuit, and a servo gate pulse synchronized with the output cycle of the tracking servo signal is supplied to the other input terminal of the OR gate circuit. A disk drive device characterized in that a signal is supplied to a signal readout circuit so that the signal readout circuit can be set in an operation mode during a servo gate period to perform a tracking servo operation even when the signal is not selected.