JP2825113B2 - CD-WO disk writing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD-WO (write-once) disk writing apparatus for improving the jitter characteristics of a CD-WO (write-once) disk after writing on the disk.

[0002]

2. Description of the Related Art In recent years, as a recordable disc, a CD-W
An O disk has been proposed. For example, as shown in FIGS. 2 and 3, the CD-WO disk (blank disk) 1 has a disk guide groove 2 having a pitch of 1.6 μm in a spiral shape from the inner circumference to the outer circumference. Is formed.

Further, the disk guide groove 2 is physically wobbled with a deviation of about 0.03 μm, and its frequency becomes 22.05 kHz when the linear velocity on the disk guide groove 2 is 1.4 m / s. It has become.

Therefore, in the CD-WO disk writing device, during a recording operation, an ATIP signal included in a signal due to the reflected light from the CD-WO disk 1 and a clock (CLOCK) used in the CIRC recording system. 4.321
8 MHz), the phase of which is compared with a clock of 22.05 kHz, the rotational speed of the drive motor of the CD-WO disk 1 is corrected based on the phase comparison result, and the line of the CD-WO disk 1 is corrected by this correction. The speed is kept constant.

[0005]

By the way, the CD-
CD-ROM that can be additionally recorded by a WO disk writing device
In the WO disk 1, eccentric jitter occurs due to physical displacement of the center hole 1a. This is, for example,
This is because the center hole 1a is formed with a deviation of about several tens to several hundreds μm from the true center of the track of the D-WO disk 1.

Therefore, even if the CD-WO disk 1 is controlled at a constant rotation speed, the ATIP signal contained in the reflected light from the CD-WO disk 1 contains jitter synchronized with the period of the rotation. Will be. Note that this jitter amount is determined by the mechanism of its generation, which is generally used in commercially available CDs.
This corresponds to the reproduction jitter of the disk.

The amount of jitter is not only due to the processing error of the sensor hole at the time of manufacturing the disk, but also due to the eccentricity due to an error of the mechanical accuracy at the time of chucking the CD-WO disk 1 into the writing device. Also joined.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to write data on a CD-WO disk in synchronization with an ATIP carrier signal containing jitter to reduce the jitter of the CD-WO disk during recording. Can be
An object of the present invention is to provide a CD-WO disk writing apparatus capable of improving jitter characteristics of a CD-WO disk after writing.

[0009]

In order to achieve the above object, the present invention provides a method for forming recording pits on a CD-WO disk in response to a recording signal, the recording pit being included in a signal reflected by the CD-WO disk. CD-WO disk writing device that corrects the rotation of the CD-WO disk drive motor in accordance with the phase difference between the ATIP carrier signal and the clock used in the recording system of the CIRC so that the linear velocity is constant. A clock control unit for outputting a clock of a predetermined frequency synchronized with the ATIP carrier signal, storing a recording signal obtained by the recording system of the CIRC, and recording the stored signal on the CD-WO disk. In order to output the signal as a signal, the recording signal stored therein can be read by the clock from the clock control unit. And a FIFO unit, the CD-W
The gist of the invention is that recording on the CD-WO disk is performed in synchronization with an ATIP carrier signal including jitter generated when the O disk rotates.

[0010]

With the above-mentioned structure, at the time of recording on the CD-WO disc (CD-WO blank disc), a recording signal processed by the recording system of the CIRC (circ) in the FIFO section as usual. Is stored.

At this time, the linear velocity of the CD-WO disk is kept constant based on the ATIP carrier signal (ATIP signal contained in the blank disk) contained in the signal due to the reflected light from the CD-WO disk. However, this ATIP carrier signal is also used for reading control of the FIFO unit.

That is, the ATIP carrier signal is input to the clock control unit, and a clock synchronized with the ATIP carrier signal is output by the clock control unit.
The recording signal of the CD-W is read at this timing.
Recording on the O disk is performed.

Therefore, not only the processing error of the sensor hole at the time of manufacturing the CD-WO disk, but also the eccentricity due to the mechanical accuracy error at the time of chucking the CD-WO disk 1 into the writing device, etc. W
Even if jitter occurs during recording on the O disk, the reading of the FIFO section is performed in synchronization with the ATIP carrier signal containing the jitter, so that the jitter is canceled.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A CD-WO disk writing apparatus according to the present invention uses a clock synchronized with an ATIP signal (ATIP signal contained in a blank disk) contained in reflected light from a CD-WO disk during a recording operation. Then, this clock is used as a form of the write timing of the CD-WO disk to cancel the jitter generated in the CD-WO disk.

For this reason, the CD-WO disk writing apparatus of the present invention has the configuration shown in FIG.
An optical head unit 3 that forms recording pits on a WO disk (or blank disk) 1 and converts reflected light from the CD-WO disk 2 into an electric signal, and various signals obtained by the optical head unit 3 A signal separation unit 4 for separating at least an ATIP carrier signal;
An oscillating unit 5 for generating a clock (reference clock) of a predetermined frequency (for example, 4.3218 MHz) used for the recording system of the CIRC (circ), and using the generated clock as a reference timing, processing an input signal (data) by a predetermined process; A first frequency divider 7 that divides the generated clock to obtain a clock of a predetermined frequency (for example, 22.05 kHz); a first frequency divider 7 that divides the divided clock and the separated ATIP A first phase comparator 8 for comparing the phase of the carrier signal with the carrier signal;
A first loop filter unit 10 for setting a control voltage (control signal) for correcting the rotation of the drive motor 9 of the O disk 1,
A clock controller 11 for outputting a clock phase-synchronized with the separated ATIP carrier signal;
The recording signal processed in the encoder unit 6 is stored,
A FIFO unit 12 for reading out the recording signal by a clock from the clock control unit 11 and writing the same on the CD-WO disk 1;

The clock control unit 11 includes a second phase comparison unit 11a, a second loop filter unit 11b, and a VCO unit 1.
PLL constituted by 1c and second frequency divider 11d
And outputs a clock of a predetermined frequency (for example, 4.3218 MHz) synchronized with the ATIP carrier signal.

The frequency of the ATIP carrier signal is 22.05 kHz, and the FIFO unit 1
Since it is necessary to set the frequency of the read clock of No. 2 to 4.3218 MHz, a clock having a frequency of 4.3218 MHz is output from the VCO unit 11c, and this clock is converted into a clock of 22.05 kHz by the second frequency dividing unit 11d. Divided. Then, the phase of the divided clock is compared with the phase of the separated ATIP carrier signal, and a 4.3218 MHz clock synchronized with the ATIP carrier signal is obtained based on the phase comparison result.

In the CD-WO disk writing apparatus having the above-described structure, the CD-WO disk 1 is rotated by the driving motor 9 during the writing operation of the CD-WO disk (or blank disk) 1 as in the conventional case, and The rotation of the drive motor 9 is corrected by the first phase comparison unit 8 and the first loop filter unit 10 so that the linear velocity of the CD-WO disk 1 becomes constant.

In this case, 4.321 generated by the oscillation unit 5
The 8 MHz clock is 1/19 by the first frequency divider 7.
The frequency is divided into 6, which is 22.05 kHz which is almost the same as the frequency of the ATIP carrier signal. This 22.05k
The rotation speed of the driving motor 9 is corrected by the phase difference between the clock of Hz and the ATIP carrier signal.

Further, 4.3218M of the oscillation unit 5 is used.
The clock of Hz is input to the recording system of the CIRC, that is, the CIRC encoder unit 6 that performs a process required to obtain a recording signal, and the recording signal processed by the CIRC encoder unit 6 is stored in the FIFO unit 12. .

At this time, the ATIP carrier signal is also input to the PLL circuit of the clock control unit 11, and the 4.2318 MHz clock phase-synchronized with the ATIP carrier signal obtained by the PLL circuit is supplied to the F
The read clock of the IFO unit 12 is used.

Therefore, the recording signal processed in the same manner as in the prior art is stored in the FIFO unit 12,
The reading of the recording signal by the O section 12 is synchronized with the ATIP carrier signal. For example, when the ATIP carrier signal contains jitter, the read timing of the recording EFM signal is changed according to the jitter.

In other words, the jitter synchronized with the jitter of the ATIP carrier signal at the time of recording is intentionally added to the CD-WO.
This is applied to the write signal of the disk 1, and as a result, the above-mentioned jitter amount is offset.

As described above, not only the error due to the processing error of the sensor hole at the time of manufacturing the disk, but also the CD-W
Jitter caused by eccentricity due to an error in mechanical accuracy at the time of chucking the CD-WO disc into the writing device in the additional recording of the O disk 1 and the like is cancelled.
The jitter characteristic of the CD-WO disk 1 after writing is improved, and the amount of jitter can be suppressed to the level of a commercially available CD disk.

[0025]

As described above, the CD-ROM of the present invention is used.
According to the WO disk writing device, when recording pits are formed on a CD-WO disk in response to a recording signal,
The rotation of the drive motor for the CD-WO disk is corrected according to the phase difference between the ATIP carrier signal included in the signal due to the reflected light from the D-WO disk and the clock used in the recording system of the CIRC. In a CD-WO disk writing apparatus having a constant linear velocity, the AT
When a clock of a predetermined frequency synchronized with the IP carrier signal is output, a clock control unit and a recording signal obtained by the CIRC recording system are recorded, and the stored signal is used as a recording signal of the CD-WO disk. For this purpose, there is provided a FIFO unit which enables a recording signal to be read out by a clock from the clock control unit, and recording pits are formed on the CD-WO disk in accordance with the recording signal read out from the FIFO unit. So the above CD
-Jitter is caused not only by the processing error of the center hole at the time of manufacturing the WO disk, but also by the eccentricity due to the error of the mechanical accuracy at the time of chucking for recording (additionally writing) the same CD-WO disk (blank disk). When the CD-WO disc is recorded, the jitter can be offset, and the CD-WO after writing can be cancelled.
There is a useful effect that the jitter characteristics of the disk can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a writing apparatus for a CD-WO disk showing one embodiment of the present invention.

FIG. 2 is a schematic front view of a CD-WO disc.

FIG. 3 is a schematic partial front view of a CD-WO disc.

[Explanation of symbols]

 Reference Signs List 1 CD-WO disk (blank disk) 1a Center hole 2 Disk guide groove 3 Optical head unit 4 Various signal separation unit 5 Oscillator 6 CIRC encoder unit 9 Motor (for disk drive) 11 Clock control unit (PLL circuit) 11a Second 11b Second loop filter section 11c VCO section 11d Second frequency divider 12 FIFO section

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G11B 7/00-7/007 G11B 19/02 501 G11B 19/247 G11B 19/28

Claims (1)

(57) [Claims] When forming recording pits on a CD-WO disc according to a recording signal, an ATIP carrier signal included in a signal due to reflected light from the CD-WO disc and a recording system of the CIRC are used. In a CD-WO disk writing device for correcting the rotation of the drive motor for the CD-WO disk in accordance with the phase difference from the clock to make the linear velocity constant, a clock having a predetermined frequency synchronized with the ATIP carrier signal is used. Clock control means for outputting, and a recording signal obtained by the recording system of the CIRC, and a clock from the clock control means for outputting the stored signal as a recording signal of the CD-WO disk. A FIFO means for reading out a stored recording signal, wherein the CD-WO disk Recording on the CD-WO disk in synchronization with an ATIP carrier signal containing jitter generated when the disk is rotated.
Disc writing device.