Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent
1990-10-01
1993-12-07
Rosenbaum, Mark
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
283109, B42D 1500
Patent
active
052677559
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a recording medium and, more particularly, to a heat transfer recording medium which is preferably used as an identification card, etc. and provides greater security against counterfeiting and falsifying.
BACKGROUND OF THE INVENTION
Conventionally, many types of cards such as identification cards, driving licences and membership cards carry thereon various items of information to provide a disclosure of what the bearers are. Of the most importance for ID cards in particular are literal information such as name and address and a photographic image of face.
One classical technique for applying a photograph of face to each of various cards involves bonding it to a given region of the card with an adhesive. Problems with this technique are that it is very laborious; it makes the surface of the card uneven and so rids it of flatness; and it allows the card to be easily counterfeited or falsified by the replacement of .another photograph of face.
In order to solve the defect of such an old technique as mentioned above, there has been developed a sublimation transfer type of imaging technique.
According to this heat transfer technique, a sublimation type of heat transfer sheet formed by providing onto the surface of a substrate film a layer containing a dye sublimable and transferable by heat is overlaid on a card substrate., and the assembly is heated from the back side of the sublimation transfer sheet with a thermal head to reproduce a photograph of face on the card substrate simultaneously with printing of various letters, characters and so on. Alternatively, these characters may be printed in a hot meltable ink type of heat transfer manner. In either case, this technique has the advantage of being able to be carried out with a simple thermal printer. Since various items of information obtained by the above heat transfer technique are less than satisfactory in terms of such properties as rub resistance, however, the surface of the photograph, etc. is generally provided with a transparent surface protecting layer excelling in such properties as rub resistance.
Especially because the photograph is formed by fixing the dye in the card substrate, the card obtained by the above technique is of improved flatness and provides greater security against falsifying and counterfeiting. Even with this technique, however, there is a little fear that the photograph and other information may be falsified or counterfeited by removing the protecting layer by solvents, acids, bases or the like.
DISCLOSURE OF THE INVENTION
It is accordingly an object of the present invention to provide a heat transfer recording medium best-suited for making ID cards, etc. to which greater security against counterfeiting and falsifying is imparted.
This object is attainable by the present invention set forth below.
More specifically, the present invention relates to a heat transfer recording medium characterized in that some items of information such as a photograph of face and characters are carried on the surface of a substrate by heat transfer and a transparent protective layer is provided on at least a part of the information through an adhesive layer, if required, said adhesive layer and/or protective layer functioning to provide security against counterfeiting.
On or in the adhesive or protective layer of the card providing a coating to various items of information, there is formed a safe-from-counterfeiting layer comprising a design or other marking, which does not substantially conceal the above information, thereby making it difficult for forgers to reconstruct the design or other marking when they intend to falsify or counterfeit the photograph, etc. Thus, falsifying or counterfeiting, if attempted, can immediately be found out, making it difficult to falsify or counterfeit the card.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 through 10; 13 through 26; and 28 through 31 are each a sectional view illustrating a preferred embodiment of the present invention,
FIGS. 11, 12 and 27 are
REFERENCES:
patent: 3552853 (1971-01-01), Sanders et al.
patent: 4171864 (1979-10-01), Jung et al.
patent: 4971646 (1990-11-01), Schell et al.
patent: 5010243 (1991-04-01), Fukushima et al.
Ando Jitsuhiko
Fujimura Hideo
Iwata Tamami
Oshima Katsuyuki
Torii Masanori
Dai Nippon Insatsu Kabushiki Kaisha
Fridie Jr. Willmon
Rosenbaum Mark
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