JPS5536872A - Copy prevention method - Google Patents

Copy prevention method

Info

Publication number
JPS5536872A
JPS5536872A JP11048678A JP11048678A JPS5536872A JP S5536872 A JPS5536872 A JP S5536872A JP 11048678 A JP11048678 A JP 11048678A JP 11048678 A JP11048678 A JP 11048678A JP S5536872 A JPS5536872 A JP S5536872A
Authority
JP
Japan
Prior art keywords
wavelength region
color
sensible
color copying
spectral characteristics
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11048678A
Other languages
Japanese (ja)
Inventor
Satoshi Takeuchi
Akira Izawa
Yoshiaki Hida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP11048678A priority Critical patent/JPS5536872A/en
Publication of JPS5536872A publication Critical patent/JPS5536872A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/04—Preventing copies being made of an original
    • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To prevent forgery of a check, a merchandise bond, or the like with a color copying machine, by using adjacently for printing 2 colors different from each other in spectral characteristics in the wavelength region insensible by a photosensitive material for color copying but similar to each other in spectral characteristics in the other wavelength region. CONSTITUTION:The wavelength region sensible by a photosensitive material for color copying is generally discontinuous and the material is not sensitive to a wavelength region near 560-600nm. The image formed by using 2 kinds of color materials C and D having difference in reflection spectral characteristics in the visible wavelength region beyond the wavelength region sensible by the photosensitive material for color copying, but similar characteristics in the visible wavelength region sensible by the material can be recognized by human eyes, but the color copied image becomes similar colors and unrecognizable. Therefore, adjacent use of the 2 color materials in printing renders the image, color-copied from the recognizable original, unrecognizable, permitting forgery of a check, a merchandise bond, etc. to be prevented.
JP11048678A 1978-09-08 1978-09-08 Copy prevention method Pending JPS5536872A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11048678A JPS5536872A (en) 1978-09-08 1978-09-08 Copy prevention method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11048678A JPS5536872A (en) 1978-09-08 1978-09-08 Copy prevention method

Publications (1)

Publication Number Publication Date
JPS5536872A true JPS5536872A (en) 1980-03-14

Family

ID=14536947

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11048678A Pending JPS5536872A (en) 1978-09-08 1978-09-08 Copy prevention method

Country Status (1)

Country Link
JP (1) JPS5536872A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5640581A (en) * 1979-09-12 1981-04-16 Kyodo Printing Co Ltd Forgery protection printed matter
FR2503890A1 (en) * 1979-09-17 1982-10-15 Auken John Van Multi-colour anti-copying system for e.g. xerographic copier - uses pre-selected background and image colours for colouring original document to prevent copying
US6255567B1 (en) 1999-01-19 2001-07-03 Yamaha Corporation Stringed musical instrument with composite body partially formed of metal or synthetic resin
US6664453B2 (en) 2001-03-05 2003-12-16 Yamaha Corporation Guitar neck attachment structure
US6888054B2 (en) 2002-05-16 2005-05-03 Yamaha Corporation Body structure of guitar

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5640581A (en) * 1979-09-12 1981-04-16 Kyodo Printing Co Ltd Forgery protection printed matter
JPS6340677B2 (en) * 1979-09-12 1988-08-12 Kyodo Printing Co Ltd
FR2503890A1 (en) * 1979-09-17 1982-10-15 Auken John Van Multi-colour anti-copying system for e.g. xerographic copier - uses pre-selected background and image colours for colouring original document to prevent copying
US6255567B1 (en) 1999-01-19 2001-07-03 Yamaha Corporation Stringed musical instrument with composite body partially formed of metal or synthetic resin
US6664453B2 (en) 2001-03-05 2003-12-16 Yamaha Corporation Guitar neck attachment structure
US6888054B2 (en) 2002-05-16 2005-05-03 Yamaha Corporation Body structure of guitar

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