JPH0638012U - optical disk - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an optical disc that is less likely to have dust or scratches. In an optical disc provided with a non-recording part that does not record a signal on an inner peripheral part and an outer peripheral part and a recording part that records a signal sandwiched between the non-signal recording parts, at least a part of the thickness of the non-recording part The optical disc is characterized in that the thickness is larger than the thickness of the recording portion. [Effect] Read errors are less likely to occur.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical disc in which a recorded information portion engraved on a video disc, a compact disc or the like is prevented from being dusted or scratched.

[0002]

[Prior art]

 FIG. 2 shows a perspective view of a conventionally used optical disk. The optical disk comprises a non-recording section 10 that does not record signals on the outer and inner circumferences, and a recording section 20 that records signals sandwiched between the non-recording sections 10. The optical discs in the non-signal section 10 and the signal section 20 have the same thickness.

[0003]

[Problems to be solved by the device]

 Optical discs read the intensity of light generated by light reflection or interference as information, so if the surface of the optical disc is dusty or scratched, it becomes difficult to read the information, and reading errors are likely to occur.

As described above, the non-signal portion 10 and the signal portion 20 of the optical disc have the same thickness, and the surface of the optical disc is flat. For this reason, if the optical disc is left on a desk or the like, the surface of the optical disc that is in contact with the desk is easily dusted or scratched, which may cause a reading error.

An object of the present invention is to provide an optical disc that is less likely to have dust and scratches.

[0006]

[Means for Solving the Problems]

 The gist of the present invention is to provide an optical disc provided with a non-recording part that does not record a signal in the inner and outer peripheral parts and a recording part that records a signal sandwiched between the non-signal recording part, at least the non-recording part. The optical disc is characterized in that a part of the thickness is thicker than the thickness of the recording portion.

[0007]

[Action]

 Since the thickness of the non-recording area is thicker than that of the recording area, even if the optical disk is left on a flat surface such as a desk, it is the non-recording area that comes into contact with the surface of the desk or the like, and the recording surface contacts the desk or the like. Since it has no edges, the surface of the optical disk is less likely to get dust or scratches.

[0008]

【Example】

 Examples will be described below, but the present invention is not limited thereto.

FIG. 1 is a perspective view showing an optical disc of the present invention. Protrusions 11 are provided on both sides of the optical disc at intervals of 120 degrees in the non-recording portion 10 on the outer peripheral portion. By providing the protrusion 11, at least a part of the non-recording portion is thicker than the recording portion. For this reason, even if the optical disc is left on the desk, the non-recording part comes into contact with the desk, and the recording surface does not come into contact with the desk, so that the optical disc surface is less likely to be dusted or scratched.

In the optical disc shown in FIG. 1, the non-recording portion 10 on the outer peripheral portion is provided with the projections at intervals of 120 degrees, but the intervals at which the projections are provided are arbitrary. Further, it may be provided continuously in a circumferential shape. Further, it may be provided on the inner peripheral portion, or may be provided on both the outer peripheral portion and the inner peripheral portion. When the recording section is an optical disk having only one side, the protrusion may be provided only on the side having the recording section.

[0011]

[Effect of device]

 Even if the optical disk of the present invention is left on a desk or the like, it is hard to get dust and scratches and is less likely to cause a reading error.

[Brief description of drawings]

FIG. 1 is a perspective view of an optical disc of the present invention.

FIG. 2 is a perspective view of a conventionally used optical disc.

[Explanation of symbols]

 10 Non-recording part 11 Protrusion part 20 Recording part

Claims (1)

[Scope of utility model registration request] 1. An optical disc provided with a non-recording portion that does not record a signal on an inner peripheral portion and an outer peripheral portion and a recording portion that records a signal sandwiched between the non-signal recording portion, at least a part of the non-recording portion. The optical disc is characterized in that its thickness is larger than that of the recording portion.