JP2007280576A - Optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk wherein a surface on which light for recording or reproducing an information signal is made incident can be recognized. <P>SOLUTION: Discrimination between a recording surface and a label surface is enhanced to satisfy user's diversity by pasting a protective sheet 102 attachable to and detachable from the recording surface on which a light beam is made incident, to an information layer 103 of the optical disk, and providing a sheet 104 on which rugged information can be additionally written on the label surface opposed to the recording surface. Recording and reproducing characteristics can be maintained by exchanging the protective sheet 102 pasted on the recording surface when a fingerprint and the like adhere to the protective sheet and the recording and reproducing characteristics of the information layer 103 are changed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disc for reproducing or recording a CD, a DVD or the like.

  In recent years, optical discs in which various data such as images such as CDs and DVDs, music, and games are recorded are widely used. In these optical discs, digital data is recorded on a recording medium, but in order to know what is recorded, it is usually not known unless it is reproduced by a drive. For this reason, it has been proposed to store index prints together with image data, or to stick a sticker for displaying the contents on the disk surface as disclosed in Patent Document 1.

In addition, for example, optical discs for games used by children with small palms, etc., and in order to make it easy for visually impaired people to identify the recording surface, for example, in Patent Document 2, printing is performed with irregularities such as Braille on the surface. Has been proposed.
JP 2003-187552 A Utility Model No. 3008574

  However, since it is difficult to distinguish the first and second sides in the first place, even if it is possible to confirm by touching one side, it may smudge fingerprints or scratch the disk surface when first checking the surface. Therefore, there is a problem that a problem such as deterioration in reproduction performance occurs.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems, and to provide an optical disc capable of recognizing a surface on which light for recording or reproducing an information signal is incident.

  In order to solve the conventional problems, the present invention includes an information layer capable of recording and reproducing information signals, a recording surface on which a light beam is incident on the information layer to record or reproduce information signals, and the recording surface And an opposite side of the label surface, the recording surface and the optical disc comprising two sheets each affixed to the label surface, the sheet affixed to the recording surface, A configuration in which the recording and / or reproducing laser light wavelength is transmitted and the sheet attached to the label surface can be additionally recorded with printing including irregularities, and the sheet attached to the recording surface can be replaced. Is provided. With this configuration, it is possible to easily discriminate the contents recorded on the optical disc by people other than the visually impaired by printing including unevenness, and the surface is damaged by touching the recording surface, etc., and data access becomes impossible. Even in this case, it is possible to provide an optical disc that allows data access again easily by simply replacing the sheet on the recording surface side.

  As described above, with the optical disc of the present invention, it is possible to provide an optical disc that can be recorded even if it has a visual impairment and can be reproduced even if the recording surface is damaged by touching the recording surface. Become.

  The best mode of the optical disk of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of an optical disc in the present embodiment. In the figure, reference numeral 102 denotes a sheet (hereinafter referred to as a protective sheet) affixed to a recording surface on which a light beam for recording and / or reproducing information signals (hereinafter referred to as recording / reproducing) is recorded on the information layer 103 of the optical disc. ) 104 is a sheet affixed to the label side opposite to the recording side. Recording / reproduction to / from the information layer 103 is performed by transmitting the light beam 105 a emitted from the optical pickup 105 b through the transparent substrate 101. That is, when reproducing the information signal recorded on the information layer 103 of the optical disc, the laser beam 105a irradiated from the optical pickup 105b is reflected by the information layer 103 of the optical disc, and passes again through the head portion 105b of the optical pickup. Is reproduced as a signal. When an information signal is recorded on the information layer 103 of the optical disc, a predetermined information signal is recorded on the recording surface 103 of the optical disc by the laser beam 105a irradiated from the optical pickup 105b.

  An example of recording on the sheet 104 attached to the label surface is shown in FIG. In the figure, 201 is picture information, 202 is character information, 203 is an area where the sheet 104 on the outer periphery of the optical disk is not affixed, and 204 is a clamp area of the optical disk. In this way, the picture information 201 and / or the character information 202 is recorded on the sheet 104. On the sheet 104, for example, a toner material disclosed in JP-A-01-257854 is processed into a sheet so that a visible image having irregularities is obtained by heating at about 100 ° C., for example, the color used for the toner material described above. By adding the leuco dye of (Chemical Formula 1) and the developer of (Chemical Formula 2) in a molar ratio of 1: 3, the visual information is added by heating at about 70 ° C. (by heating at about 120 ° C. At the same time, the visible information and the unevenness information can be obtained by heating at about 100 ° C. In particular, visual information having irregularities is preferable because the difference between the label surface and the recording surface can be clearly determined, and even visually impaired persons can easily determine the difference. In general, it is preferable that the sheet 104 affixed to the label surface cannot be replaced, but there is no problem even if the sheet 104 can be replaced. Further, when using an optical disc apparatus capable of recording on a recordable optical disc, visual information having irregularities can be directly written on the sheet 104.

On the other hand, the protective sheet 102 affixed to the recording surface transmits the light beam 105a emitted from the optical pickup 105b, and at the same time, the total thickness of the protective sheet 102 and the transparent substrate 101 has optimum optical characteristics for the information layer 103. Must be set. Further, by making the protective sheet 102 replaceable, when a fingerprint or a flaw adheres to the surface of the protective sheet 102 and optical characteristics are lost, the optical characteristics can be restored by replacing the protective sheet 102.

  In FIG. 1, a pasted optical disk is illustrated, but a single-plate optical disk such as a so-called compact disk may be used. In addition, if the recording portion and the disc clamp portion of the optical disc conform to the physical standard of the disc, the recording / reproducing performance is not affected. By making it smaller than the data unrecorded area 203, the unevenness may be made easier to understand.

  The optical disc according to the present invention is useful as a consumer optical disc.

Optical disk sectional view in Embodiment 1 of the present invention Top view of the optical disc in Embodiment 1 of the present invention

Explanation of symbols

102 Protective sheet 103 Information layer 104 Label side sheet

Claims (1)

An information layer capable of recording / reproducing an information signal, having a recording surface on which a light beam is incident on the information layer to record or reproduce an information signal, and a label surface opposite to the recording surface, An optical disc comprising two sheets each having a recording surface and a label surface attached thereto,
The sheet affixed to the recording surface transmits a laser beam wavelength for recording and / or reproduction with respect to the information layer, and the sheet affixed to the label surface can be additionally recorded with printing including irregularities. ,
An optical disc characterized in that the sheet attached to the recording surface can be replaced.