JPH0822689A - Optical disk drive - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an optical disk device capable of quickly and accurately grasping the data modes of all tracks and preventing overwriting and performing a reliable additional write operation. By comparing the detected length of the pregap portion of the track with the length of the pregap portion of the adjacent track, it is possible to determine whether or not the data modes of the adjacent tracks are the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for writing and reading on a write-once optical disk.

[0002]

2. Description of the Related Art Conventionally, various types of optical disk devices for mounting a writable optical disk (write-once type) and performing random access have been devised. In this case, the data information to be recorded on each track of the write-once optical disc is often independent, and the information on each track is often erased independently. . For this reason, for example, when a disc in which recording is performed only halfway of the track or a disc in which random erasure is performed is mounted in the optical disc device, an unrecorded area of the track (empty track) It is necessary to quickly detect the position of, and access the recording / reproducing head to the position of the empty track to perform an operation such as recording.

As a publicly known example for promptly detecting the position of such an empty track to perform the recording operation, Japanese Patent Laid-Open No. 3-1999
There is one disclosed as a "recording or reproducing apparatus" in Japanese Patent No. 10192, and one disclosed as "overlap recording prevention method in an optical recording and reproducing apparatus" in Japanese Patent Publication No. 4-19612. In the former example, the light spot is sequentially scanned on the track, and recording / unrecording is discriminated by the presence / absence of signal detection, and when the unrecorded area is detected, the position is temporarily stored in the storage means. This means that, for example, when mounting a disc,
Since the unrecorded area can be known in advance based on the storage means prior to new recording, the recording / reproducing head can quickly access the unrecorded area to record information. Further, in the latter example, when the light spot is sequentially skipped from a certain track position to an adjacent track position by using the jumping means, when a signal for recording information is not detected at a track position on the way, the track is skipped. It is determined that the track is an unrecorded area, and recording is performed on the track, thereby preventing overwriting in the recorded area.

[0004]

In the conventional example as described above, the storage means and the interlacing means are used to quickly access the unrecorded area and prevent overwriting in the recorded area. There is. However, it is not always economical to provide such a storage means or an interlacing means, and it cannot be said that the value is sufficiently satisfactory in terms of access speed and prevention of overwriting.

A write-once optical disc has a temporary T
A PMA (program memory area) section can be used as OC (table of contents).
In this PMA portion, information about the track such as the start address, stop address, and track number of the track is written. If the information on the recorded / unrecorded (empty track) of the track can be known from this information. As compared with the above-mentioned conventional example, the access speed and the overwrite prevention can be far improved. But PM
The information written in the A section includes the data mode (described later).
Since the information indicating MODE1, MODE2) is not included, the recording state of the track cannot be known even if the information of the PMA portion is detected as it is.

[0006]

According to a first aspect of the invention, a writable write-once optical disc is used, and a recording / reproducing head is moved according to track information read from the write-once optical disc to record or reproduce information. In the optical disc apparatus for performing the above, the length of the pregap portion arranged in front of each track formed on the write-once optical disc is detected, and the detected pregap portion length and the pregap of the adjacent track are detected. A pre-gap length discriminating means for comparing the length of the portion is provided.

According to a second aspect of the present invention, in the first aspect of the present invention, when the write-once optical disc is in the middle of writing, the pre-recording of each track is performed based on the track content of the PMA information stored in the PMA section of the disc. A PMA information pre-gap portion reading means for reading the gap portion was provided.

According to a third aspect of the present invention, in the first aspect of the present invention, the write-once optical disc is stored in the lead-in area while the writing is in progress and when the lead-in area of the disc is already written. TOC
A TOC information pre-gap portion reading means for reading the pre-gap portion of each track based on the track content of information is provided.

[0009]

According to the first aspect of the invention, the length of the pregap portion arranged in front of each track formed on the write-once type optical disc is detected, and the length of the pregap portion of the detected track is adjacent to the length of the pregap portion. By comparing with the length of the pre-gap part of the track to be determined, it is possible to judge whether the data mode of the adjacent track is the same or not. It becomes possible to recognize.

According to the second aspect of the present invention, a part of the pregap portion of each track is read based on the track content of the PMA information to check whether or not writing is performed in the pregap portion, and when writing is being performed. Further, by checking the contents of the data mode of the track corresponding to the pre-gap portion, it becomes possible to more accurately grasp the data mode of each track and to make a reliable judgment as to whether or not additional recording is possible.

According to the third aspect of the invention, a part of the pregap portion of each track is read based on the track content of the TOC information written in the lead-in area, and the operation of checking whether or not the lead-out area is written is checked. It is possible to determine whether or not the disc is a true closed disc by executing, and read the pregap portion of each track according to the TOC information to make a reliable determination as to whether or not additional recording is possible.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, an embodiment of the invention described in claim 1 will be described with reference to FIG. The present optical disk device can be loaded with a writable write-once optical disk (hereinafter referred to as a CD-R disk), and this CD-R disk is used for recording,
Information is read by a recording / reproducing head capable of reproducing. According to the read recorded contents, the CPU
(Central processing unit) controls the operation of the device. In this embodiment, in such an optical disc device, the length of the pregap portion arranged in the front portion of each track formed on the CD-R disc is detected, and the detected length of the pregap portion of the track is compared with the detected length. A pregap length determination means for comparing the lengths of the pregap portions of adjacent tracks is provided.

The operation of the pre-gap length discriminating means in such a configuration will be described with reference to the flow chart of FIG. Now, when an unknown CD-R disc is loaded into this device, the TOC information is read and the loaded CD is loaded.
After confirming whether or not the lead-in area (TOC) of the -R disc is written, PMA information is read and the number N of tracks is obtained (ab). Next, it is checked whether or not the track 1 has been written, and the data mode (MODE 1 or MODE 2) is set to the track 1 according to the written state.
That is, if the track 1 is not written, the data mode of the track 1 is set to MODE1. If the track 1 has been written, the data mode is set to MODE1 or MODE2 according to the state of the track 1 (c
~ D).

Next, the length of the pre-gap portion arranged at the front of each track is repeatedly examined until the number of tracks reaches N (e to f). In this case, according to the ORANGE BOOK standard, "The pre-gap length between consecutive different tracks is
The length of the pre-gap portion (pre-gap length) is checked by using the rule "2 seconds or more is required when the data mode is the same, and 3 seconds or more is required when the data mode is different." That is, when the pre-gap length of the current track is 2 seconds or more, it can be determined that the data mode of the track is the same mode (MODE1 or MODE2) as the data mode of the immediately preceding track. on the other hand,
When the pre-gap length of the current track is 3 seconds or more, it can be determined that the value of the data mode of the track is different from the value of the data mode of the track immediately before that, and thus the data of the current track is determined. Set the mode to either MODE1 or MODE2, which is the opposite mode to the data mode of the immediately preceding track. As mentioned above, using the rules for pregap length stipulated in ORANGE BOOK, simply read the pregap part of each track, and read the pregap part of the read track and the pregap part of the adjacent track. It is possible to determine whether or not the data modes of the adjacent tracks are the same by performing the comparison of. Therefore, because of this, it is possible to quickly and accurately grasp the data modes of all tracks, regardless of whether they are recorded areas or unrecorded areas.

Next, an embodiment of the invention described in claims 2 and 3 will be described with reference to FIG. In this embodiment, when the CD-R disc is in the middle of writing, a PMA information pregap portion reading means for reading the pregap portion of each track based on the track content of the PMA information stored in the PMA portion of the disc is provided. (Corresponding to the invention of claim 2).

The flow chart of FIG. 2A shows the PM
9 illustrates an operation example of the A information pre-gap portion reading unit. This operation can be inserted between C and D in the flowchart of FIG. That is, a part of the pregap portion of each track is read according to the track content of the PMA information (g), it is determined whether or not there is writing in the pregap portion (h), and if it is written, that track is further tracked. The contents of the data mode are checked to determine whether or not the track can be additionally written (i). If the data can be additionally written, the data is written to the track (k). Return to (j). On the other hand, if the pre-gap portion has not been written, data is immediately written in the track (k). As a result, the data mode of each track can be grasped more accurately, and whether or not additional recording can be performed can be reliably determined. Therefore, it is possible to prevent the data from being left unwritten in the unrecorded area and the data from being accidentally overwritten in the recorded area to destroy the data.

Further, in the present embodiment, when the write-once optical disc is in the middle of writing and the lead-in area of the disc is already written, based on the track content of the TOC information stored in the lead-in area. A TOC information pre-gap portion reading means for reading the pre-gap portion of each track may be provided (claim 3).
Corresponding to the described invention). The flowcharts of FIGS. 2A and 2B show an operation example of the TOC information pre-gap portion reading means. Of these, the operation of FIG. 2B continues from A in the flowchart of FIG. That is, based on the track content of the TOC information, a part of the pregap portion of each track is read to confirm whether or not the lead-in area has been written, and then the operation for confirming whether or not the lead-out area has been written is executed (m). . If the lead-out area has been written, it is determined that additional writing is not possible and the process jumps to D in FIG. 1; if no writing has been made, B in FIG.
Returning to the position, the same operation as the embodiment of the invention described in claims 1 and 2 is performed. After writing in the lead-in area in this way, it is possible to determine whether or not the disc is truly closed by checking the write state in the lead-out area. Therefore, because of this, reliable additional recording can be performed even on a disc in which an unrecorded area remains while TOC information exists.

[0018]

According to the first aspect of the present invention, an optical disk device that uses a writable write-once type optical disk and moves a recording / reproducing head according to track information read from the write-once type optical disk to record or reproduce information. At
The length of the pre-gap portion arranged in front of each track formed on the write-once optical disc is detected, and the detected length of the pre-gap portion of the track is compared with the length of the pre-gap portion of the adjacent track. Since the pre-gap length determining means is provided, it is possible to determine whether or not the data modes of the adjacent tracks are the same by simply reading the pre-gap portion of each track. It is possible to quickly and accurately grasp the data modes of all tracks, regardless of whether they are areas or unrecorded areas.

According to a second aspect of the present invention, in the first aspect of the present invention, when the write-once optical disc is in the middle of writing, the pre-writing of each track is performed based on the track content of the PMA information stored in the PMA section of the disc. Since the PMA information pre-gap portion reading means for reading the gap portion is provided, the data mode can be more accurately grasped and added by checking the presence / absence of writing in the read pre-gap portion and the contents of the data mode of the track. Whether or not it is possible can be determined with certainty, and thus it is possible to prevent the data from being left unwritten in the unrecorded area and the data from being accidentally overwritten and destroyed.

According to a third aspect of the invention, in the invention of the first aspect, the write-once optical disc is being written, and
When the lead-in area of the disc has already been written, the TOC information pre-gap portion reading means for reading the pre-gap portion of each track based on the track content of the TOC information stored in the lead-in area is provided. By executing the operation of confirming the presence or absence of writing in the lead-out area based on the track content of the TOC information written in the lead-in area, it is possible to easily determine whether or not the disc is a truly closed disc. As a result, reliable additional recording can be performed even on an optical disc in which TOC information is present but an unrecorded area remains.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of the invention described in claim 1.

2A is a flowchart showing an embodiment of the invention described in claims 2 and 3, and FIG. 2B is a flowchart showing an embodiment of the invention described in claim 3.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 19/12 501 C 7525-5D 27/00 D 9463-5D

Claims (3)

[Claims] 1. A writable write-once optical disc is used,
In an optical disc apparatus for recording and reproducing information by moving a recording / reproducing head according to track information read from the write-once optical disc, a pre-gap portion arranged at the front part of each track formed on the write-once optical disc. And a pregap length determining means for detecting the length of the track and comparing the detected length of the pregap part of the track with the length of the pregap part of the adjacent track. 2. A PMA information pre-gap section for reading the pre-gap section of each track based on the track content of the PMA information stored in the PMA (program memory area) section of the write-once optical disk during writing. The optical disk device according to claim 1, further comprising a reading unit. 3. The TOC stored in the lead-in area when the write-once optical disc is in the middle of writing and the lead-in area of the disc is already written.
2. The optical disk device according to claim 1, further comprising TOC information pregap portion reading means for reading the pregap portion of each track based on the track content of the (table of contents) information.