Stock material or miscellaneous articles – Structurally defined web or sheet – Edge feature
Reexamination Certificate
1997-03-04
2001-01-23
Krynski, William (Department: 1774)
Stock material or miscellaneous articles
Structurally defined web or sheet
Edge feature
C369S283000, C428S207000, C428S209000, C428S690000, C428S913000, C430S270110, C430S945000
Reexamination Certificate
active
06177176
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an information recording medium and a process for production thereof. The invention relates particularly, although not exclusively to a reliable information recording medium which is resistant to forgery and a process for production thereof.
2. Related Background Art
To date magnetic recording cards, such as credit cards or bank cards and so on have been used as portable information recording media. In recent years, IC cards, optical cards and so on have been proposed as a portable information media which have a larger recording capacity. Using such a larger recording capacity, it has been proposed to use such media as electric money or bank cards capable of recording dealings with a bank.
In such portable information media which are used to record important information relating to money and so on, it is important that improper use of the media, such as the use of stolen or lost information recording media, is difficult, and faking of the media is also difficult.
One method of preventing faking of a medium, is to provide a picture of the medium owner's face personal data, or data relating to the distributor of the information recording media etc., as holographic information in the information recording medium as initial information before distribution of the medium.
In order to produce such a medium, various methods are used in order to create difficulties in faking the information on the recording medium. For example it is known to form the above mentioned initial information on a thin sheet and attach the sheet to a card. In addition to providing such initial information, a lot of media processing is used for the purpose of preventing fake media. For example in a laminate type card in which a transparent sheet is laminated on an information sheet, it is possible to insert a watermark or special microprint.
In particular where such an information recording medium has a large recording capacity intended for extensive use, if the information recording medium is faked, the social effect is forecast to be very large.
Therefore in such an information recording medium, it is necessary to provide information which is more difficult to fake in order to prevent faking of the information.
SUMMARY OF THE INVENTION
An object of this invention is to provide an information recording medium which is difficult to fake. Another object of this invention is to provide a process for production of an information recording medium which is difficult to fake.
According to a first aspect of the invention there is provided an information recording medium comprising a stack of layers including a recording layer interposed between two shielding layers, the shielding layers being opaque to radiation within a predetermined waveband, (i.e., having a wavelength band that is used to record information to the recording layer or read information stored in the recording layer) said recording layer being adjacent to at least one layer which is transparent to radiation within the predetermined waveband, the recording layer being readable from an edge of the medium by radiation within the predetermined waveband passing into said one layer.
According to a second aspect of the invention there is provided a process for production of an information recording medium according to the first aspect of the invention including the steps of forming said stack of layers and laminating said stack of layers.
In a medium in accordance with the first aspect of the invention, information in the first recording layer may be reproduced only from the edge of the information recording medium, the first recording layer being embedded in the recording medium.
When such an information recording medium is faked, it is necessary to reproduce the medium production from the beginning. Therefore, there are more steps required to produce a fake, as compared to a recording medium that uses fake preventing means comprising only attaching an initial information recorded sheet with media according to the invention, it is possible to obtain more valuable fake preventing effect than prior art media.
As it is difficult to alter, it is possible to prevent the improper use of stolen or picked up information recording media.
The design of the medium to reduce the possibility of faked media being produced does not reduce the display region which may be used for display of information on the surface of the information recording medium. In recent years, it has been proposed that a portable information recording medium comprises an IC chip, an optical recording part, or a hybrid type medium including a plurality of information recording means such as a magnetic recording area. It is preferable that an electrode of an IC chip or magnetic recording area is exposed from the information recording medium. In this invention, the information for the sake of fake preventing does not affect the freedom of placing the information recording means such as the IC chip or magnetic recording part.
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Hiraoka Mizuho
Tanabe Hiroshi
Yoshida Kouichi
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Grendzynski Michael E.
Krynski William
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