Title:
DATA RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP3413936
Kind Code:
B2
Abstract:
PURPOSE: To print invisible data while holding a white substrate natural from the aspect of a design, to print variable data inherent as invisible data and to mechanically confirming printed and recorded data to markedly enhance the security against forgery and alteration.
CONSTITUTION: A data recording medium is constituted by laminating an infrared absorbing layer for reading data, a thermal recording layer 3 changed in the transmissivity of an infrared region by temp. and constituting a recording image by the difference of infrared transmissivity, a photothermal conversion layer 5 for writing data showing selective absorbancy at a specific wavelength within an infrared region and showing permeability within other infrared region and a heat-resistant protective layer 7 pervious to infrared rays on a substrate 1.
Inventors:
Haruki Ohta
Noriyuki Ito
Noriyuki Ito
Application Number:
JP5622694A
Publication Date:
June 09, 2003
Filing Date:
March 25, 1994
Export Citation:
Assignee:
Toppan Printing Co., Ltd.
International Classes:
B42D15/10; B41M5/26; G11B7/24; G11B7/24012; (IPC1-7): B41M5/26; B42D15/10; G11B7/24
Domestic Patent References:
| JP4189196A | ||||
| JP1251445A | ||||
| JP2289924A | ||||
| JP3293194A |
Attorney, Agent or Firm:
Takehiko Suzue
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