JPH09115186A - Optical information recording medium and its recording and/or reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a display such as sign, bar code and pattern, etc., showing the recording contents of a recorded information signal invisible and to prevent illegal copy by providing an interference area constituted of plural interference grooves on a substrate. SOLUTION: This optical disk is constituted by successively laminating a disk substrate, an information signal layer, a reflection film and a protection film. A signal recording area and the interference area 3B are provided on the substrate, and a pit being the information signal is recorded on the signal recording area. The interference area 3B is provided out of the signal recording area, and is constituted of plural interference grooves 9 making light interfere with each other, and forms only the outline of the display showing the recording contents of the information signal recorded on the signal recording area. And, since the display is narrow in the area causing a difference in luminance, it is invisible by the naked eye, thereby, the illegal copy is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium such as an optical disc provided with characters, numbers and other symbols for displaying recorded contents of recorded information signals, bar codes, designs and the like, and the same. Recording and / or reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, for example, on a main surface of an optical disc, an information signal recorded in a manufacturing lot number or a signal recording area is provided in an inner peripheral portion outside a signal recording area in which a tone signal or a video signal is recorded. The characters such as characters, numbers and the like indicating the recorded contents of, and the display of bar codes and the like were provided by engraving or the like. Then, these displays can be visually recognized with the naked eye to grasp the recorded contents.

[0003]

As described above, the optical disc is easily illegally duplicated because the display showing the recorded contents of the information signal recorded in the signal recording area is easily visible to the naked eye. There was a problem.

Therefore, the present invention provides an optical information recording medium capable of preventing illegal duplication by making the display showing the recorded contents of the recorded information signal invisible to the naked eye, and the recording and / or recording thereof. An object is to provide a reproducing device.

[0005]

In order to achieve the above object, an optical information recording medium according to the present invention has a signal recording area in which an information signal is recorded and a light provided outside the signal recording area to interfere with each other. And an interference region formed by a plurality of interference grooves. Then, the interference area forms only the contour of the display showing the recorded contents of the information signal recorded in the signal recording area.

Further, the recording and / or reproducing apparatus for the optical information recording medium according to the present invention has an interference area formed by a plurality of interference grooves provided outside the signal recording area of the optical information recording medium to interfere with light. Is provided with a detection means for reading a display showing the recorded contents of the information signal forming only the contour.

According to the optical information recording medium configured as described above, the plurality of interference grooves forming only the outline of the display showing the recorded contents of the recorded information signal have a difference in luminance due to the interference effect of light. Therefore, the interference area formed by these interference grooves is detected as a display. Further, in this display, since the interference region forms only the contour and thus the region in which the difference in brightness is generated is narrow, it is impossible to be visually recognized by the naked eye and illegal copying is prevented.

Further, according to the recording and / or reproducing apparatus of the optical information recording medium of the present invention, the interference area formed by the plurality of interference grooves provided in the optical information recording medium forms only the contour. The display is detected by the detection means. That is, recording and / or recording on this optical information recording medium
Alternatively, the reproducing device detects the recorded content of the information signal recorded on the optical information recording medium.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An optical disk will be described below as a specific embodiment of an optical information recording medium according to the present invention with reference to FIGS. As shown in FIG. 1, the optical disc 1 according to the embodiment has a disc substrate 3 formed in a disc shape by a transparent synthetic resin material such as polycarbonate (PC) or polymethylmethacrylate (PMMA), and the disc substrate 3 on which the disc substrate 3 is formed. An information signal layer 4 having the information signal recorded thereon, a reflective film 5 formed on the information signal layer 4,
In order to protect the information signal layer 4 mechanically and chemically, a protective film 6 formed on the information signal layer 4 is formed.

A signal recording area 3A in which an information signal is recorded is formed on the main surface of a disk substrate 3 which constitutes the optical disk 1.
And an interference area 3B provided adjacent to the signal recording area 3A. In the signal recording area 3A, pits 8 which are information signals are provided.

The interference area 3B, which is the main part of the optical disk 1, is composed of a plurality of interference grooves 9 that interfere with light. The interference area 3B forms only the outline of a symbol indicating the recorded content of the information signal recorded in the signal recording area 3A.

That is, as shown in FIG. 3, the symbol formed only by the contour of the interference region 3B forms only the contour of the alphabet character E, for example. The contour of the alphabet letter E is composed of a plurality of interference grooves 9 having different length dimensions. The width of each of the interference grooves 9 is 0.5 μm or more.

The light incident on the interference groove 9 is visible light and has a wavelength of 380 nm to 780 nm. Therefore, when the incident direction on the interference groove 9 changes, the light incident on the interference groove 9 interferes with the interference groove formed so that the width dimension of the interference groove 9 is about several tens of μm or less. Therefore, the width dimension of the interference groove 9 that interferes the incident light is 0.4 μm.
It is within the range of about m to several tens of μm.

The optical disk 1 has a laser beam diameter of about 0.5 μm for processing the pits 8 used in the manufacturing process.
Since the interference groove 9 is processed by this laser light, the width dimension of the interference groove 9 is formed to be 0.5 μm or more.

In the optical disc 1 constructed as described above, the interference area 3B formed by a plurality of interference grooves 9 is formed.
The state in which the characters forming the contour are visually recognized will be described with reference to FIG. The contour of the letter E formed by the interference region 3B is
Since the incident light interferes with the interference groove 9, there is a difference in brightness between the interference region 3B and the periphery of the interference region 3B.

The character E, in which the interference region 3B forms only the contour, has a narrow region in which the difference in brightness is small, so that it cannot be visually recognized by the naked eye. It is possible.

When the optical disc 1 described above is manufactured,
A protrusion for forming an interference groove 9 is provided on a so-called stamper for molding a disc for forming a pit 8 on the disc substrate 3, and the interference groove 9 is formed by this protrusion. Therefore, in the optical disc 1, when the pits 8 which are the information signals are formed on the disc substrate 3, the interference groove 9 forming the interference region 3B is formed at the same time as the pits 8.

Therefore, according to the optical disc 1, an error occurs that the information signal recorded in the signal recording area 3A and the display showing the recorded contents of the information signal recorded in the signal recording area 3A do not match. Is prevented.

As described above, according to the optical disc 1 of the embodiment, the interference region 3B provided on the disc substrate 3 and constituted by the plurality of interference grooves 9 has the recorded contents of the information signal recorded in the signal recording region 3A. By forming only the outlines of the symbols such as the letters and numbers shown and the display of the bar codes and the like, it is possible to visually recognize as a display due to the interference effect of light using an optical microscope. Therefore, according to the optical disc 1, since it is impossible to visually recognize it with the naked eye,
Illegal copying is prevented.

The optical disk 1 has a plurality of interference grooves 9 in the contour of the display of symbols, bar codes and the like, and these interference grooves 9 have a concavo-convex pattern similar to the pattern of pits 8 which are information signals. is there. Therefore, according to the optical disc 1, it is possible to easily manufacture the stamper provided with the convex portion that forms the interference groove 9, and to configure the interference region 3A that forms the contour of the display on the disc substrate 3. It is possible to transfer the interference groove 9 to be manufactured, and it can be easily manufactured.

The display showing the recorded contents of the recorded information signal is not limited to the structure in which the interference region 3B formed by the interference groove 9 forms the outline of a symbol such as a character or a number. As shown in FIG. 5, the bar code 3C may be configured to form the contour of each bar.

In the bar code 3C showing the recorded contents of the recorded information signal, the interference region 3B constituted by a plurality of interference grooves 9 respectively forms only the contour of each bar,
The longitudinal direction of each bar is provided so as to match the radial direction of the optical disc 1.

The relationship between the position of the barcode 3C and the output of the detection signal when the barcode 3C is scanned and detected by the barcode reader will be described with reference to FIG. As shown in FIG. 6, the vertical axis represents the detection output of the detected barcode 3C, and the horizontal axis represents the position of the barcode 3C in the width direction. The detection output line 11 and the output of the detection signal with respect to the position of the barcode 3C in the width direction are shown.

According to the detection output line 11, as shown in FIG. 6, the output of the detection signal decreases at both ends of the bar of the bar code 3C in the width direction of the bar, and the detection signal output near the center of the bar in the width direction. It shows that the output increases.
That is, the barcode 3C having each bar in which the plurality of interference grooves 9 form only the contour is reliably detected by the difference in the output of the detection signal in the width direction of each bar. Therefore,
The barcode 3C is invisible to the naked eye and is reliably detected by the barcode reader.

The optical information recording medium according to the present invention has been adopted as an optical disc, but the optical information recording medium is not limited to the optical disc. For example, a magneto-optical disc or an optical recording section in which an information signal is recorded is incorporated. Of course, it may be applied to other optical information recording media such as an information card. Further, the display formed by the interference area is not limited to only the recorded contents of the information signal recorded in the signal recording area, and it goes without saying that the manufacturing lot number may be shown, for example.

Next, as a concrete embodiment of the recording and / or reproducing apparatus of the optical information recording medium according to the present invention, an optical disk recording / reproducing apparatus for reproducing the optical disk 1 is provided with the information signal provided on the optical disk 1. An optical pickup device is provided as a detection means for reading the contour of the display showing the recorded contents. This optical disk recording / reproducing apparatus includes an interference area 3 provided on the optical disk 1 by an optical pickup device.
The display in which B forms only the contour is read by the difference in luminance, and the recorded content of the information signal recorded on the optical disc 1 is detected.

As described above, according to the optical disc recording / reproducing apparatus, by providing the optical pickup device, it is possible to detect the display in which the interference region 3B provided on the optical disc 1 forms only the contour. .

The detection means is not limited to the structure provided with the optical pickup device for reading the contour of the display, and when the display showing the recorded contents of the recorded information signal is a bar code, the bar code is displayed. It may be configured to include a barcode reading device that scans and reads.

[0029]

As described above, according to the optical information recording medium of the present invention, the interference area formed by a plurality of interference grooves for interfering light is recorded in the information recording area of the information signal. By forming only the outline of the display indicating “”, the display is made invisible to the naked eye, and thus illegal copying is prevented.

Further, according to this optical information recording medium,
Since the interference area formed by the interference groove is formed outside the signal recording area of the substrate on which the signal recording area of the information signal is provided, the interference area can be easily formed and the optical information The recording medium can be easily manufactured.

Further, according to the recording and / or reproducing apparatus of the optical information recording medium according to the present invention, the interference area formed by a plurality of interference grooves provided outside the signal recording area of the optical information recording medium is formed. By having the detection means for reading the display showing the recorded content of the information signal forming only the contour, the recorded content of the information signal recorded on the optical information recording medium can be detected.

[Brief description of the drawings]

FIG. 1 is a perspective view shown for explaining the configuration of an optical disc according to an embodiment of the present invention.

FIG. 2 is a perspective view of a disk substrate that constitutes the optical disk.

FIG. 3 is a plan view shown for explaining an example of a character formed by an interference region formed on the disk substrate.

FIG. 4 is a plan view for explaining a state in which a character formed by an interference area formed on the disc substrate is visually recognized.

FIG. 5 is a plan view shown for explaining another example of the display provided on the optical disc.

FIG. 6 is a relationship diagram between the output of the detection signal and the position of the barcode when the barcode formed by the interference area is detected.

[Explanation of symbols]

 1 Optical Disc (Optical Information Recording Medium) 3 Disc Substrate (Substrate) 3A Signal Recording Area 3B Interference Area 8 Pit 9 Interference Groove

Claims (2)

[Claims] 1. A signal recording area in which an information signal is recorded,
A substrate having an interference area provided outside the signal recording area and configured by an interference groove for interfering light is provided, and the interference area is only a contour of a display showing recording contents of the information signal recorded in the signal recording area. An optical information recording medium, characterized in that 2. A recording and / or reproducing apparatus for an optical information recording medium for reading / reproducing and / or writing / recording an information signal to / from a signal recording area of the optical information recording medium, comprising: Optical information recording characterized by having a detection means for reading a display showing the recorded contents of an information signal, which is provided outside the signal recording area and which is formed by a plurality of interference grooves for interfering light and forms only a contour. Recording and / or reproducing apparatus for media.