JP2650263B2 - Optical disc and information recording / reproducing method therefor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc and an information recording / reproducing method for the same, and more particularly, to a sector identification section of an optical disc capable of distinguishing in-groove recording and inter-groove recording of a guide track.

2. Description of the Related Art As guide tracks of a conventional optical disc, an in-groove recording method (in-groove recording method) and an inter-groove recording method (on-land recording method) are known.

FIG. 3 shows a guide track of this conventional example, and FIGS. 3 (a) and 3 (b) are an enlarged plan view of a sector identification portion (ID) of a groove-to-groove recording system and a cross-sectional view of AA '. It is.

3 (c) and 3 (d) are an enlarged plan view of a sector identification portion (ID) of the in-groove recording method and a sectional view taken along line BB '. In FIG. 3, 1 is a V-shaped V-groove, 2 and 3 are signal pits of an ID portion, 4 is a guide groove, 5 is a light beam tracking on a land portion 9, and 6 is tracking on a V-groove. A light beam, 7 is a light beam tracking in the groove, 8 is a light beam tracking in the groove, and 9 is a land portion for recording and reproducing data signals.

In the inter-groove recording, the land portion 9 is tracked to record and reproduce data signals. In the in-groove recording, the guide groove 4 is tracked to record and reproduce signals.

Problems to be Solved by the Invention However, in the above configuration, it is necessary to know the tracking polarity of the optical disk at first because the optical disk tracking does not function normally. That is, in the case of inter-groove recording, the V-groove 1 is a guide track having a depth of λ / 8 (where λ is the wavelength of light in the base material) and has a narrower width than the light beams 5 and 6, 5 and 6 generate a tracking error signal for tracking the land portion 9 between the V grooves 1. The data signal is recorded on the land 9 between the V-grooves 1 and the pit 2
Are pits having a large reproduction signal amplitude and a depth of λ / 4. At the time of normal tracking, the light beam tracks the land 9 as shown in FIG. If the tracking polarities are incorrectly reversed, the light beam will track the V-groove 1 as shown at 6.

In the case of recording in a groove, both the guide groove 4 and the pit 3 have a depth of λ / 8, and the width of the guide groove 4 is selected to be smaller than that between the grooves. At the time of normal tracking, the light beam is tracked so as to come directly above the pit 3 and the guide groove 4 as shown in FIG.
On the other hand, when the tracking polarities are reversed, the light beam is tracked between the grooves as shown in FIG. As apparent from the above description, in FIGS. 3 (a) and 3 (c), since the polarities of the tracking error signals are opposite, when the optical disk is inserted into the drive, the guide tracks of the optical disk on which the drive is mounted are landed. Unless it is known whether the data is recorded or recorded in a groove, data cannot be recorded and reproduced normally.

The method of determining the tracking polarity based on whether or not the signal of the ID section can be read is the same as that shown in FIGS. 3A and 3C. As can be seen from the above, in many cases, correct reading can be performed, so that it cannot be used for polarity determination of tracking.

For this reason, a tracking polarity identification hole has been provided in a cartridge of an optical disk. However,
The tracking polarity identification hole has a problem that a microswitch is used for the detection and lacks reliability.

In view of the foregoing, an object of the present invention is to provide an optical disk capable of detecting the tracking polarity of various optical disks without providing a tracking polarity identification hole in a cartridge and an information recording / reproducing method thereof.

Means for Solving the Problems The present invention has a sector consisting of a sector identification section in which address information is recorded and a data field section in which data is recorded. This is an optical disc provided with an in-groove recording / inter-groove recording discrimination flag.

Also provided is a sector having a sector identification portion for recording address information and a data field portion for recording data, and the sector identification portion is provided with an identification flag for indicating whether the guide track is in-groove recording or inter-groove recording. A first optical disc, a sector including a sector identification section for recording address information and a data field section for recording data;
A second step of recording data in a groove having no identification flag in the sector identification section or recording data in the groove.
In the method of recording / reproducing with the optical disk, first, the sector identification section is reproduced, and if the sector identification section cannot be reproduced, the tracking polarity is inverted from the current polarity. In the case of reproduction, the recording polarity is set by knowing the inter-groove recording or the intra-groove recording from the information of the identification flag, and if there is no identification flag even if the sector identification section can be read, the tracking polarity is left as it is. In this manner, data is recorded and reproduced by setting the address information to a tracking polarity at which the address information can be normally reproduced.

According to the present invention, the sector identification portion is first read out by, for example, inter-groove tracking, and the tracking polarity of the guide track of the optical disc is determined based on the intra-groove recording / inter-groove recording identification flag recorded in a part of the address information. Know. If the sector identification section cannot be read normally, switch the tracking polarity, read the sector identification section again, check the tracking polarity with the in-groove recording / inter-groove recording identification section flag, and make the data recording / reproduction function normally. Is possible.

Embodiment FIG. 1 is a configuration diagram of a track format of an optical disc in an embodiment of the present invention. In the track shown in FIG. 1A, a sector including a sector identification section (ID) and a data field section (DF) is composed of sectors S0, S1 to Sn.

As shown in FIG. 1B, the sector identification section ID has a track address (TA) and a sector address (SA) as an information section, a preamble (PR) for clock reproduction, and an address mark indicating the head of data. (AM), address information,
It consists of an error detection code (CRC) and a postamble (PO) for clock recovery.

The address information includes a high-order track address (TH), a low-order track address (TL), and a sector address (SA). The sector address (SA) is composed of sector address data (SD) and an intra-groove recording / inter-groove recording identification flag FG. FG is set to, for example, 0 for in-groove recording and 1 for inter-groove recording.

FIG. 2 is a flowchart for determining the recording between grooves (lands) and the recording within grooves (grooves) on the optical disk.

Now, when the optical disk is loaded into the optical disk drive, the drive performs tracking with the tracking polarity of the inter-groove recording polarity, and then reads the sector identification section ID.

At this time, if the ID can be read normally without error, the inter-groove recording / in-groove recording identification flag FG is checked. If FG is 1, the track being tracked is between the grooves (lands), so that the recording and reproduction between the grooves can be performed.

On the other hand, when the ID cannot be read or FG is 0, the tracking polarity is switched to the polarity of the in-groove (groove) recording, and the tracking is performed again. In this state of the in-groove recording tracking, the drive reads the ID.

When the ID can be read, the FG is checked. If FG is 0, the track is a recording track in a groove, and recording and reproduction in the groove can be performed.

On the other hand, if the ID cannot be read or FG is 1, the optical disk is an optical disk that cannot be used in this drive, and error processing is performed.

As described above, the flag FG inverted to 0 (1) and 1 (0) between the inter-groove recording portion and the in-groove recording portion provided in the ID,
By checking the tracking polarity between the grooves in the tracking control or the tracking polarity in the recording in the groove, it is possible to perform appropriate recording and reproduction on the optical disc.

The reading of the in-groove recording / inter-groove recording identification flag FG can be shared by the sector identification section reproducing circuit.

As is clear from the above description, the ambiguity in reading the sector identification section ID data caused by the difference in tracking can be eliminated by providing an identification flag in the sector identification section ID and using the error detection code of the sector identification section ID. Since it is possible to know whether recording is performed in a groove or between grooves on an optical disk with high reliability, it is not necessary to provide a special identification hole in the cartridge.

As described above, according to the present invention, the tracking polarity can be known with high reliability by providing the in-groove recording / inter-groove recording identification flag in the sector identification portion of the optical disk.
Its practical effect is great.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a track format of an optical disk in an embodiment of the present invention, FIG. 2 is a flowchart for judging recording in a groove / recording between grooves on the optical disk, and FIG. is there. ID: Sector identification unit, PR: Preamble, AM: Address mark, CRC: Error detection code, PO: Postamble, TA: Track address, TH: Higher track address, TL: Lower track address , SA: Sector address, SD: Sector address data, FG: In-groove recording / inter-groove recording identification flag, DF: Data field section.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Joe Kuroki 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Yasu Higashitani 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

(57) [Claims] 1. An identification flag for indicating whether a guide track is in-groove recording or inter-groove recording in a sector having a sector identification section recording address information and a data field section recording data. Optical disc provided with. 2. The optical disk according to claim 1, wherein the identification flag is provided in a track address information of the sector identification section or an empty bit of the sector address information. 3. The optical disk according to claim 1, wherein the identification flag is provided as an additional bit in addition to the track address information or the sector address information of the sector identification section. 4. An identification flag for indicating whether a guide track is in-groove recording or inter-groove recording in a sector having a sector having a sector identification section recording address information and a data field section recording data. A sector comprising a first optical disc provided with a disc, a sector identification section recording address information and a data field section recording data, and recording data in a groove not having the identification flag in the sector identification section. Alternatively, in the method of recording / reproducing with the second optical disk for recording data in the groove, the sector identification section is reproduced first, and if the sector identification section cannot be reproduced, the tracking polarity is reversed from the current polarity. When the flag is reproduced from the sector identification unit, the information of the inter-groove recording or the intra-groove recording is known from the information of the identification flag. Set the tracking polarity, and if there is no identification flag even if the sector identification section can be read, keep the tracking polarity as it is, and record data by setting the tracking polarity so that the address information can be normally reproduced. An information recording / reproducing method for an optical disc, characterized by reproducing.