Embossing of banknotes or the like with security devices

Details Embossing of banknotes or the like with security devices Embossing of banknotes or the like with security devices

1995-12-07

1999-06-29

Fridie, Jr., Willmon

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283109, 283 67, B42D 1500

Patent

active

059157313

DESCRIPTION:

BRIEF SUMMARY
This invention relates to security documents or tokens such as bank notes, travellers cheques, bonds, passports, and is particularly concerned with providing bank notes or other security documents or tokens with a low cost security device that has an attractive appearance whilst being difficult to duplicate.
Australian Patent No 558476 discloses a method of producing a plastics bank note or security token or the like comprising a transparent polymeric substrate coated with layers of opaque material applied in such a way as to leave a transparent area which may include an optically variable security device such as a diffraction grating on a reflective layer of foil.
Whilst plastics banknotes with transparent areas including diffraction gratings as optically variable security devices, such as disclosed in Australian Patent No 558476, are difficult to reproduce, in low value plastics bank notes the process of incorporating diffraction gratings in the notes may be too costly or not felt to be needed.
It is therefore desirable to provide a bank note or other security document or token with a simpler, less expensive security device but which is still effective and difficult to reproduce.
It is also desirable to provide a method of, and apparatus for, producing bank notes or other security documents or tokens with low cost security devices that are difficult to reproduce.
It is further desirable to provide a plastics bank note or other security document or token with a security device that produces an optically variable effect when the note, document or token is rotated or viewed from different angles and which gives feel or texture to the note, document or token.
According to one aspect of the invention there is provided a bank note or other security document or token comprising a substrate bearing indicia and having a transparent indicia free portion including a security device wherein said security device comprises an embossing or engraving on said transparent portion forming an image which allows light to pass through, the image being visible from both sides of the bank note or other security document or token.
Preferably, the embossed image is visible under reflection and transmission of light. The embossing or engraving is preferably such that when the document is tilted or viewed from different angles with respect to a light source the embossed image will reflect and transmit more or less light giving the effect of switching on or off, or changing as the document is rotated or viewed from different angles.
The embossing or engraving preferably comprises a regular matrix of embossed lines or dots or the like which together define the image. The embossed image may include one or more embossings deeper than other embossings and/or it may include embossed lines or series of dots extending at different angles to each other.
In a preferred embodiment the embossed image includes a first set of substantially parallel lines and a second set of substantially parallel lines extending at an angle with respect to the first set of parallel lines so that as the document is rotated or viewed from different angles relative to the light source the first set of parallel lines transmit more or less light than the second set of parallel lines.
Alternatively, or additionally, the embossed image may include embossed lines or dots of different depth, width or size so as to introduce different shapes into the image which become more or less evident as the document is rotated or viewed from different angles relative to a light source. Preferably, at least some of the lines, dots or other embossings are of a sufficient depth and/or width to be capable of detection by the naked eye and by touch.
According to another aspect of the invention there is provided a bank note or other security document or token comprising a substrate bearing indicia, said substrate having a portion of plastics material carrying a security device, characterised in that said security device comprises a matrix of embossings formed in said portion of plastics m

REFERENCES:
patent: 4033059 (1977-07-01), Hutton et al.
patent: 4304809 (1981-12-01), Moraw et al.
patent: 4420515 (1983-12-01), Amon et al.
patent: 4579754 (1986-04-01), Maurer et al.
patent: 5005872 (1991-04-01), Lass et al.
patent: 5388862 (1995-02-01), Edwards

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