JPH01286121A - Optical disk - Google Patents

Abstract

PURPOSE:To make a record confirming operation unnecessary and to shorten a recording time by providing a defect information part in the neighborhood of an ID part, and recording information by selecting an unrecorded part where no defect exists. CONSTITUTION:The ID part 3 is constituted of a pre-bit string 7 arranged on one round of a land 6. Also, the defect information part 4 is constituted of a defective data pre-bit string 9 provided following the bit string 7, and represents whether or not a defect 10 exceeding prescribed size exists. And by reading the defect information part 4 following the ID part 3, the land 6 in the unrecorded part 2 where no defect 10 exists is selected by evading the unrecorded part 2 of an address where the defect 10 exists, then, a signal is recorded. In such a way, it is possible to make the record confirming operation unnecessary, and to shorten the recording time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc, and particularly to an optical disc used in a recordable optical disc system such as a write-once optical disc system or a rewritable optical disc system.

[Conventional technology]

A conventional optical disc includes an unrecorded area for recording information and an ID area that indicates the sector and address of the unrecorded area.

Next, a conventional optical disc will be described in detail with reference to the drawings.

FIG. 4 is a plan view showing a conventional example.

The optical disc 1' shown in FIG. 4 includes an unrecorded part 2 for recording information and an ID part 3 indicating the sector and address of the unrecorded part 2. The unrecorded part 2 is, for example, an optical disc 10. The spiral pitch on the surface is 1.6
The land 6 is a convex portion sandwiched between a pre-group 5 which is a concave portion having a width of approximately 0.5 microns and a depth of approximately 0.08 microns. FIG. 5 is a partially enlarged plan view of part A' shown in FIG. It is configured as a pre-pit row 7 which is a series of bits of about 0.15 microns.

FIG. 6 is a partially enlarged plan view of section B' shown in FIG. 4;
By irradiating the focused laser beam along the pre-group 5, sector and address data is read from changes in the amount of reflected light from the pre-pitch row 7, and the modulated laser beam is irradiated onto the land 6 at an arbitrary address. Information is recorded by forming signal pits 8. In this case, the signal pits 8 cannot be formed correctly because the unrecorded part 2 is scattered with defective parts lO such as minute pinholes or scratches, and there is a possibility that the information cannot be recorded correctly. It is necessary to reproduce and confirm whether or not the information has been recorded correctly. If it has not been recorded correctly, it is necessary to record the information again in the unrecorded section 2 of a separate address.

[Problem to be solved by the invention]

However, such a conventional optical disc as described above is configured to include an unrecorded area for recording information and an ID area that indicates the sector and address of the unrecorded area, and the unrecorded area includes a general Since there are scattered defects such as minute pinholes or scratches on the disc, there is a risk that the information will not be recorded correctly when the user records information to an arbitrary address. If the information is not recorded correctly, it is necessary to repeat the operation of recording the information again in the unrecorded area of a separate address, so the disadvantage is that it takes a lot of time to record the information on the optical disc. be.

[Means to solve the problem]

The optical disc of the present invention has an unrecorded portion for recording information, and an ID indicating the sector and address of the unrecorded portion.
and a defect information section provided near the ID section and indicating whether or not there is a defect exceeding a predetermined size that would affect recording characteristics in the unrecorded section indicated by the ID section. It consists of:

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing one embodiment of the present invention.

The optical disc 1 shown in FIG. 1 includes an unrecorded section 2 for a user to record information, an ID section 3 for indicating sectors and addresses of the unrecorded section 20, and an ID section 3 provided near the ID section 3. and a defect information section 4 indicating whether or not there is a defective section 10 such as a pinhole or scratch exceeding a predetermined size that would affect recording characteristics in the unrecorded section 2 indicated by . be done.

The unrecorded portion 2 is, for example, a pregroup 5 which is a concave portion spirally provided on the surface of the optical disc 1 with a pitch of 1.6 microns, a width of about 0.5 microns, and a depth of about 0.08 microns. It is configured as a land 6 which is a sandwiched convex portion.

FIG. 2 is a partially enlarged plan view of section A shown in FIG.
The D section 3 has a width of about 0.6 microns, a length of about 1 micron, and a depth of about 0, which are arranged in plural pieces around the land 6.
．． Pre-pit row 7 is a series of 15 micron pits.
The defect information section 4 is configured as a defect data prepit row 9 provided following the prepit row 7 constituting the ID section 3. The defect data pre-pit row 9 has a defect portion 10 exceeding a predetermined size that affects the recording characteristics detected by a defect inspection device, for example, if the defect portion 10 is located at the address where the defect data pre-pit row 9 is arranged. It shows whether or not it exists in the land 6 which is the recording section 2.

FIG. 3 is a partially enlarged plan view of part B shown in FIG. 1, in which the defective data pre-pit row 9 is irradiated with a laser beam to form a defect in the land 6 at the address where the defective data pre-pit row 9 is arranged. By reading the information as to whether or not the defective part 10 exists, the land 6 which is the unrecorded part 2 of the address where the defective part 10 exists is avoided and the land which is the unrecorded part 2 of the address where the defective part 10 does not exist. 6 is selected and modulated laser light is irradiated to form signal pits 8 to record information.

[Effects of the Invention] The optical disc of the present invention has a defect information section that indicates whether or not there is a defect exceeding a predetermined size that would affect the recording characteristics in the unrecorded area for the user to record information. By providing it near the ID section, information can be recorded by selecting an unrecorded section where there are no defective sections, so it is possible to play back and check whether the information has been recorded correctly or not. In this case, there is no need to record the information again in the unrecorded portion of a separate address, so there is an advantage that information can be accurately recorded in a short time.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
FIG. 3 is a partially enlarged plan view of section B shown in FIG. 1, FIG. 4 is a plan view of a conventional example, and FIG. 5 is a plan view of section A shown in FIG. FIG. 6 is a partially enlarged plan view of section B shown in FIG. 4. 1.1'... Optical disc, 2... Unrecorded section, 3... ID section, 4... Defect information, 5... Pre-group, 6... Land, 7... Pre-pit row, 8... Signal pit, 9... Defect data pre-pit row, 10.
...Defect part. Agent: Susumu Uchihara, Patent Attorney Figure 2, Figure 3

Claims (1)

[Claims] an unrecorded part for recording information; an ID part indicating the sector and address of the unrecorded part; and an ID part provided near the ID part to affect the recording characteristics of the unrecorded part designated by the ID part. What is claimed is: 1. An optical disc comprising: a defect information section indicating whether or not a defect exceeding a predetermined size exists.