JPH06124528A - Disk drive device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce power consumption during drive standby. In a disk drive device in which a disk is rotated at a constant rotational angular velocity and the recording frequency is increased from the inner circumference side to the outer circumference side of the disk, the head is displaced to the inner circumference of the disk during drive standby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device that rotates a disk at a constant angular velocity.

[0002]

2. Description of the Related Art In a disk drive device having a constant rotational angular velocity, the inner and outer rims of the disk have different linear velocities, and when recording at one recording frequency, the inner and outer rims have different recording densities, resulting in a large loss in recording capacity. Therefore, for example, the zone from the innermost circumference to the outermost circumference of the disc is divided into a plurality of zones, the recording frequency is changed in units of zones, and the recording frequency is gradually increased toward the outer circumference side zone to increase the recording density. Is almost constant.

When the head is displaced to the track of the target address, writing is performed at the recording frequency of the zone corresponding to that address, or reading is performed at the same frequency. When the writing or reading is completed, the head waits at the track position of the address and waits for the next writing or reading command. That is, when there is no next write or read command, the current track is scanned forever and the reproduction system circuit reads the address signal and the like to confirm the current position and perform the tracking operation.

[0004]

However, since the current consumption of the signal processing circuit increases as the signal frequency increases, the power consumption varies depending on the standby position, and the power consumption increases as the standby position is closer to the outer periphery. There was a drawback.

Therefore, it is an object of the present invention to provide a disk drive device in which power consumption during drive standby is reduced.

[0006]

A disk drive device according to a first aspect of the present invention for achieving the above object rotates a disk at a constant rotational angular velocity, and writes a signal with a head that moves in the radial direction of the disk. And / or reading, and in the disc drive device in which the recording frequency is gradually set higher from the inner side to the outer side of the disc, the next writing or reading command is issued within a predetermined time after the writing or reading operation is completed. If there is not, the head is moved to the inner peripheral position where the recording frequency is low.

According to a second aspect of the present invention, the disk drive device rotates the disk at a constant rotational angular velocity, and a head moving in the radial direction of the disk performs writing and / or reading of a signal, and the disk is rewritable. In the disk drive device in which the zone from the inner circumference to the outermost zone is divided into a plurality of zones, the recording frequency is changed for each zone, and the recording frequency is set higher toward the outer zone, When there is no command for the next writing or reading within a predetermined time after completion, the head is moved to the inner peripheral side zone where the recording frequency is low.

Further, in the disk drive device of the invention according to claim 3, in the structure of claim 1 or 2, when there is no next write or read command within a predetermined time after the completion of the write or read operation. Is a configuration in which the write clock of the reference clock generator is changed to the lowest frequency.

[0009]

According to the first or second aspect of the invention, the head is displaced to the inner circumference or the inner circumference side zone when there is no command within a predetermined time after the completion of the write or read operation.
The circuit of the reproduction system processes low frequency signals.

According to the third aspect of the invention, in addition to the above operation, the reference clock generator also outputs a low write clock.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention, which is applied to a magneto-optical recording apparatus.

FIG. 2 is a partial circuit block diagram of the optical disk drive device. In FIG. 2, the magneto-optical disk 1 is rotated by the rotational force of the spindle motor 2, and the spindle motor 2 is controlled by the drive control signal of the servo system circuit 3 so as to rotate the magneto-optical disk 1 at a constant angular velocity.

In the recording format of the magneto-optical disk 1, a plurality of sectors are formed on each track from the innermost circumference to the outermost circumference, and each sector comprises an address area and a data area. An address signal is recorded in advance in the address area. Further, a space between the innermost track and the outermost track is divided into a plurality of zones. The recording frequency is changed for each zone, and the recording frequency is set higher toward the outer peripheral side zone.

The bias magnetic field section 4 is arranged on the upper surface side of the magneto-optical disk 1 and generates a bias magnetic field based on a control signal from the controller 5. The optical head (head) 6 has a semiconductor laser and a photodetector, and the semiconductor laser is driven by a drive signal from the laser driver 12. The objective lens for focusing the laser light is slightly displaced by the focus control signal of the servo system circuit 3. Further, the optical head 6 is displaced in the radial direction of the magneto-optical disk 1 by the rotational force of the sliding motor 7, and the sliding motor 7 is also driven and controlled by the tracking / seek control signal of the servo system circuit 3.

The read signal picked up by the light detecting section of the optical head 6 is output to the signal detecting section 8 and the signal detecting section 8 is read.
Amplifies this read signal and outputs it to the binarization circuit 9.
The binarization circuit 9 binarizes the read signal and has a PLL synchronizer to generate a read clock based on the read signal. The circuit constant of the binarization circuit 9 is changed based on the control signal of the controller 5, and the read signal (address / data) and the read clock output from the binarization circuit 9 are supplied to the signal modulation / demodulation circuit 10.

The signal modulation / demodulation circuit 10 includes an address detector 10
a and the RLL modulation / demodulation unit 10b. The address detector 10a demodulates the address signal based on the read clock. The detected address signal is sent to the controller 5, and the controller 5 recognizes the address currently being scanned. The RLL modulator / demodulator 10b demodulates the data signal based on the read clock and outputs the demodulated data signal. Further, the RLL modulation / demodulation unit 10b modulates the input data by the RLL method based on the write clock of the reference clock generation unit 11 and outputs it to the laser drive unit 12. The clock frequency of the reference clock generator 11 is changed based on the clock control signal of the controller 5.

The controller 5 controls each circuit based on an instruction from the host computer, and executes the flow shown in FIG. 1 after the operation of the read or write instruction is completed, for example.
Further, the controller 5 has a built-in memory table corresponding to addresses and zones, and controls the circuit constants of the binarization circuit 9 and the write clock frequency of the reference clock generator 11 based on the zone of the scan track of the optical head 6.

FIG. 2 shows a circuit block diagram of the binarizing circuit 9. In FIG. 2, the amplitude of the input read signal is adjusted by the equalizer 20, noise and the like are removed by the low-pass filter 21, and the signal is guided to the comparator 22, where it is compared with a reference level and binarized. Equalizer 2
0 and the circuit constants of the low-pass filter 21 are the controller 5
It is variable by the control signal of. The operating frequency band of the equalizer 20 is changed by the circuit constant, and the cut-off frequency of the low pass filter 21 is changed by the circuit constant.

Further, the output of the comparator 22 is supplied to the PLL synchronizer 23, and the PLL synchronizer 2 is supplied.
3 is a phase comparator 24, a low-pass filter 25 and a VCO
The (voltage controlled oscillator) 26 constitutes a PLL loop to generate a read clock synchronized with the binarized signal. Then, the equalizer 20, the low-pass filter 21, the VCO2
Each current consumption of 6 increases in proportion to the frequency handled.

FIG. 4 shows a circuit block diagram of the reference clock generator 11. In FIG. 4, the reference clock generation unit 11 is composed of an oscillator 27, a phase comparator 28, a low pass filter 29, a VCO 30, and a frequency divider 31. The frequency division rate of the frequency divider 31 is changed by the control signal of the controller 5, and the frequency of the write clock is changed by the change of the frequency division rate. Then, each current consumption of the VCO 30 and the frequency divider 31 increases in proportion to the frequency handled.

The operation of the above structure will be described below. When the power is turned on, the magneto-optical disk 1 is rotated at a constant rotational angular velocity, and the optical head 6 is located on the innermost track. When a write or read command is sent from the host computer to the controller 5, the controller 5 calculates the amount of displacement up to the target address (track) and drives the slide motor 7 to move the optical head 6 to the vicinity of the track at the target address. Displace. Then, tracking control is performed based on the tracking signal picked up by the optical head 6 and it is determined whether the picked-up address matches the target address. If they do not match, the slide motor 7 is slightly displaced to track the target address. Position it on top.

Further, the controller 5 identifies the zone of the target address and outputs a control signal to the binarizing circuit 9. The binarizing circuit 9 is changed into a circuit constant suitable for the frequency of the read signal and a reference clock is generated. The control signal is output to the unit 11, and the reference clock generation unit 11 outputs the write clock of the frequency of the zone. Then, in the case of data writing, the RLL modulation / demodulation unit 10 modulates the input data into a binarized signal based on the write clock, and writes it by the optical head 6. Further, in the case of data reading, the read data signal picked up by the optical head 6 is demodulated by the RLL modulation / demodulation section 10 to obtain data from the output of the RLL modulation / demodulation section 10.

After the write or read operation is completed, the controller 5 displaces the optical head 6 to the target address as described above if there is a command for the next write or read operation within a predetermined time, as shown in FIG. Write. or,
If there is no command for the next writing or reading operation within a predetermined time, the slide motor 7 is driven to displace the optical head 6 on the innermost track (or the track in the innermost zone). 6 is waiting for a drive. Then, the controller 5 identifies the zone of the track and outputs a control signal to the binarization circuit 9 and the reference clock generator 11. Since the circuit constant of the binarization circuit 9 is suitable for the lowest frequency and the frequency of the read signal is also the lowest frequency, the current consumption is the lowest. or,
Since the write clock of the reference clock generator 11 also has the lowest frequency, it consumes the least current.

Although the magneto-optical recording method has been described in this embodiment, the present invention can be similarly applied to the optical recording method and the magnetic recording method. In addition, although the zone recording method is adopted in this embodiment, the recording signal frequency may be gradually increased toward the outer circumference side in track units. In that case, the drive standby is the innermost circumference. Trucks are most preferred.

[0025]

As described above, the first to third aspects are provided.
According to the invention, in the disc drive device that rotates the disc at a constant rotational angular velocity, the optical head is positioned on the inner peripheral side where the recording frequency is low during drive standby, so that the signal frequency processed by the reproduction system circuit is low. Therefore, there is an effect that power consumption is reduced.

Further, according to the invention of claim 3, the frequency of the write clock is also lowered, so that there is an effect that the power consumption is further reduced.

[Brief description of drawings]

FIG. 1 is a flowchart (embodiment) during drive standby.

FIG. 2 is a partial circuit block diagram of an optical disk drive device (embodiment).

FIG. 3 is a circuit block diagram of a binarization circuit (embodiment).

FIG. 4 is a circuit block diagram of a reference clock generation unit (embodiment).

[Explanation of symbols]

 1 ... Disk 6 ... Optical head (head)

Claims (3)

[Claims] 1. A disk is rotated at a constant rotational angular velocity, and a head that moves in the radial direction of the disk writes and / or reads signals, and the recording frequency gradually increases from the inner circumference side to the outer circumference side of the disk. In the disk drive device in which the head is set to a high value, the head is moved to an inner peripheral position having a low recording frequency when there is no command for the next writing or reading within a predetermined time after the completion of the writing or reading operation. Disk drive device. 2. A disk is rotated at a constant rotational angular velocity, and signals are written and / or read by a head that moves in the radial direction of the disk, and a plurality of zones are formed between the innermost circumference and the outermost circumference of the disk. In a disk drive device that is divided into sections, the recording frequency is changed for each zone, and the recording frequency is set higher toward the outer peripheral side, the next writing or reading operation is performed within a predetermined time after the completion of the writing or reading operation. A disk drive device, wherein the head is moved to an inner peripheral side zone having a low recording frequency when there is no command. 3. The write clock of the reference clock generator is changed to the lowest frequency when there is no next write or read command within a predetermined time after the completion of the write or read operation. Alternatively, the disk drive device according to claim 2.