JP2001006223A - Optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the recording state of data graspable from the appearance by changing the tone by heat which is generated by the laser light used to record the data on the data recording face. SOLUTION: A tone changing agent 2 which changes the tone by heat such as cobalt chloride is applied to the label face in the radial direction of an optical disk, as well as a scale 3 is printed on the label. When the optical disk 1 is set on a data recording device to record data, heat is generated by irradiation of laser light and the tone of the tone changing agent 2 is changed by the generated heat. Therefore, the tone of the tone changing agent 2 in the area corresponding to the recorded region 1A changes while the tone in the tone changing agent 2 in the area corresponding to the unrecorded region 1B does not change, which allows an user to grasp the recorded state of data. By printing the scale 3 in the radial direction corresponding to the tone changing agent 2, the data amount to be recorded in the unrecorded region 1B can be easily grasped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk capable of ascertaining a data recording state.

[0002]

2. Description of the Related Art Today, writable large-capacity optical disks have been developed, and data is recorded and stored on the optical disks.
Reading and outputting when necessary are performed. When data is recorded on such an optical disk again, the optical disk is set in a data recording device and data is recorded.

[0003]

However, for example, in the case of an optical disk having a recording surface coated with a fusocyanine dye, a clear difference does not appear between the color tone of the recorded area and the color tone of the unrecorded area. The recording condition could not be grasped, and in order to know the amount of data that can be recorded on the optical disk again, it was necessary to set the optical disk in the data recording device. SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical disc in which the recording status of data recorded on the optical disc can be grasped from the appearance of the optical disc.

[0004]

According to a first aspect of the present invention, there is provided an optical disk on which data can be written by a laser beam, wherein the data recording is performed on a label surface of the optical disk. Color tone changing means for changing a color tone by heat generated by the laser light for recording data on the surface is provided.

[0005] In the invention of claim 2, the color tone changing means is provided in a radial direction with a predetermined width. Claim 3
In the invention, a scale is printed in a radial direction on a surface of the optical disc on which the color tone changing means is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram of an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes an optical disk on which data can be written by a laser beam, and FIG. 1 shows a label surface opposite to a data recording surface.

On the label surface, a color tone changing agent 2 for changing the color tone by heat in the radial direction of the optical disk, for example, cobalt chloride, is applied, and a scale 3 is printed so that the recorded data amount can be grasped. Have been.

When the optical disk 1 is set in a data recording device and data is recorded, a laser beam is irradiated at the time of recording data. When the laser light is irradiated, heat is generated, and the generated heat changes the color tone of the color tone changing agent 2.

Therefore, the color tone of the color tone changing agent 2 at the portion corresponding to the recorded area 1A shown in FIG. 1 changes, and the color tone of the color tone changing agent 2 at the portion corresponding to the unrecorded area 1B does not change. You can grasp the recording status.

Since the scale 3 is printed in the radial direction in correspondence with the color tone changing agent 2, the amount of data that can be recorded in the unrecorded area 1B can be easily grasped by making it correspond to the scale 3. .

In the embodiment, the color tone changing agent 2 is provided at a predetermined width in the radial direction, but may be provided on the entire label surface.

[0012]

As described above, the color tone changing means for changing the color tone by the heat of the laser light at the time of writing is provided on the label surface of the optical disk on which data can be written by the laser light. The color tone of the portion recorded on the optical disk changes, and the recording status of the data can be grasped.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 optical disk 1A recorded area 1B unrecorded area 2 color tone change agent 3 scale

Claims (3)

[Claims] 1. An optical disk on which data can be written by laser light, wherein a color tone changing means for changing a color tone by heat generated by the laser light for recording data on the data recording surface is provided on a label surface of the optical disk. An optical disk characterized by the following. 2. The optical disk according to claim 1, wherein said color tone changing means is provided at a predetermined width in a radial direction. 3. The optical disk according to claim 1, wherein a scale is printed in a radial direction on a surface of the optical disk on which the color tone changing unit is provided.