Invisible information recorded medium
First Claim
1. An invisible information recorded medium comprising a recording medium having an identification mark recorded thereon, said identification mark being composed of a first region and a second region, whereinsaid first region has a higher reflectance than a reflectance of said medium at a near infrared wavelength,said second region has a lower reflectance than the reflectance of said medium at said near infrared wavelength, andsaid first region and said second region do not overlap each other,wherein the reflectance of said medium is represented by a reflectance on a portion at which the identification mark is not recorded.
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Abstract
An object of the present invention is to provide an invisible information recorded medium having an identification mark. In order to achieve the object, an invisible information recorded medium is provided having an identification mark recorded thereon, the identification mark being composed of a region having a high reflectance and a region having a low reflectance as compared with the reflectance of the medium in the same near infrared ray region.
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Citations
17 Claims
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1. An invisible information recorded medium comprising a recording medium having an identification mark recorded thereon, said identification mark being composed of a first region and a second region, wherein
said first region has a higher reflectance than a reflectance of said medium at a near infrared wavelength, said second region has a lower reflectance than the reflectance of said medium at said near infrared wavelength, and said first region and said second region do not overlap each other, wherein the reflectance of said medium is represented by a reflectance on a portion at which the identification mark is not recorded.
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4. An invisible information recorded medium, comprising:
- a recording medium having different reflective characteristics at a near infrared wavelength in different areas, wherein said medium has no information at a visible wavelength.
- View Dependent Claims (5, 11, 12, 13, 14, 15, 16, 17)
Specification