JPH02252590A - Documents protected against secret leakage - Google Patents

Abstract

PURPOSE:To ensure that the leakage of confidential information is prevented without much trouble by providing a recording paper consisting of a special layer, a state of which changes with the lapse of a specified time, formed on the surface of a base. CONSTITUTION:A thermally sensitive recording paper consists of a printing ink layer 2 provided on the surface of a base 1, a thermochromic material layer 3 which is a special layer provided on the surface of the printing ink layer 2 and a protective layer 4 provided on the surface of the thermochromic material layer 3. The printing ink layer 2 is, for example, composed of 'black' printing ink. In addition, the thermochromic material layer 3 is composed of a crystalline liquid which is white at normal temperature and is transparent if heated. If the thermally sensitive recording paper is heated by a thermoprinter, the liquid crystal which forms the thermochromic material layer 3 becomes transparent, and characters are printed in visible black which is the color of the printing ink layer 2. The document prepared in this way maintains a state in which it can be read at normal temperature for a specified time after printing. However, its liquid crystal becomes white after the passage of a specified time, and the printed information such as characters disappears spontaneously.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to confidential leakage prevention documents used to prevent leakage of confidential information. [Prior Art] Traditionally, when a confidential document created using a word processor, personal computer, etc. is used in a conference room, for example, the document is printed on designated recording paper and distributed to each person. Very often it is necessary. When the meeting is over and the document is no longer needed, each person manually tears up the recording paper (document) on which the document was printed to prevent confidential information from leaking outside. Either the person in charge i-1 collects the item and shreds it for disposal. [Problems to be Solved by the Invention] However, once the documents are distributed, they are placed outside the control of security leakage, and this is extremely insecure from the viewpoint of ensuring prevention of security leakage. Also, do not tear or collect documents.

[7] Shredding or [7] discarding is extremely time-consuming. The present invention was made in order to solve the above-mentioned problems, and provides a highly reliable confidential leakage prevention document that can reliably prevent the leakage of confidential information without any troublesome effort. It's about doing. [Means for Solving the Problem] In order to achieve the above object, the confidential leakage prevention document of the present invention has a layer state that changes on the surface of the base material after a predetermined period of time or when physical energy is applied. It consists of recording paper or transfer ribbon on which a special layer is formed. [Operations] Therefore, in the confidential leakage prevention document of the present invention, the information printed on the recording paper or the information printed using the transfer ribbon is automatically transferred after a predetermined period of time or by applying physical energy. can be made to disappear. This eliminates the need for troublesome efforts such as tearing, collecting, and disposing of documents, and makes it possible to reliably prevent leakage of confidential information. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an example of the structure when the present invention is applied to thermal recording paper. That is, as shown in FIG. 1, the thermal recording paper of this embodiment includes a base material 1 of the recording paper, a printing ink layer 2 provided on the surface of the base material 1, and a printing ink layer 2 provided on the surface of the printing ink layer 2. thermochromic material layer 3, which is a special layer
and a protective layer 4 provided on the surface of the thermochromic material layer 3. Here, the printing ink layer 2 is
For example, it consists of "black" printing ink. Further, the thermochromic material layer 3 is made of liquid crystal, etc., which is white at room temperature 12 and becomes transparent when heated. When creating documents using thermal recording paper with such a configuration, for example, documents created with a word processor or computer,
Printing is done by applying heat to thermal recording paper using a thermoprinter. That is, when heat is applied to the thermosensitive recording paper by a thermoprinter, the liquid crystal forming the thermochromic material layer 3 becomes transparent, and "black", which is the color of the printing thin layer 2, becomes visible and printed. Documents created in this way will remain legible at room temperature for a certain period of time after printing (for example, the time required for the end of a meeting), and at the end of that period, the liquid crystal will turn white and the printing will begin. Information such as written characters will disappear naturally. As mentioned above, the heat-sensitive recording paper of this embodiment has a thermochromic layer on the surface of the recording paper consisting of the base material and the printing ink layer 2, which is white at room temperature and becomes transparent when heated. It is constructed by forming a material layer 3. Therefore, the information printed on the thermal recording paper can be naturally erased after a predetermined period of time has elapsed. This eliminates the hassle of tearing up documents or collecting and shredding documents when they are no longer needed due to the end of a meeting, which was the case in the past. It becomes possible to reliably prevent leakage, and it is possible to obtain extremely practical thermal recording paper. Next, other embodiments of the present invention will be described. FIG. 2 is a cross-sectional view showing an example of the structure when the present invention is applied to a thermal transfer ribbon. That is, as shown in FIG. 2, the thermal transfer ribbon of this embodiment has a ribbon base material 5 and a base material 5.
The thermochromic material layer 3 is a special layer provided on the surface of the thermochromic material layer 6, and the protective layer 7 is provided on the surface of the thermochromic material layer 6. Here, the thermochromic material layer 6 is made of liquid crystal or the like that is transparent at room temperature and exhibits a certain color (for example, "black") when heated. When creating a document using a thermal transfer ribbon having such a configuration, a document created using, for example, a word processor or a personal computer is printed on, for example, white recording paper by applying heat to the thermal transfer ribbon using a thermoprinter. That is, when a thermoprinter applies heat to a thermal transfer ribbon and prints on recording paper, the liquid crystal forming the thermochromic material layer 6 changes to "
The color will be "black" and will be printed on the recording paper in this "black" color.Documents created in this way will not last for a certain amount of time (for example, the time it takes for a meeting to end) after printing at room temperature. is maintained in a readable state, and the liquid crystal becomes transparent after the specified time has elapsed, and the information such as characters printed on the recording paper naturally disappears.Therefore, even in such a thermal transfer ribbon, It is possible to obtain the same effect as in the case of .In the above embodiment, a thermochromic material layer whose layer state changes after a predetermined period of time is formed as a special layer on the surface of the base material of the recording paper or ribbon. Formation [7] Although the case is not limited to this, when physical energy (e.g., frontal energy, thermal energy, mechanical energy (pressure, etc.)) is applied to the surface of the recording paper or ribbon base material, a layer is formed. It is also possible to form a special layer whose state changes. [Effects of the Invention] As explained above, according to the present invention, when a predetermined time elapses or physical energy is applied to the surface of the group H, It is made of recording paper or transfer ribbon that has a special layer that changes its layer state, so it is an extremely reliable security leak prevention system that can reliably prevent confidential information from leaking without any troublesome effort. Documents can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to thermal recording paper, and FIG. 2 is a sectional view showing an embodiment in which the present invention is applied to a thermal transfer ribbon. DESCRIPTION OF SYMBOLS 1... Base material, 2... Printing ink layer, 3... Thermochromic substance layer, 4... Preservation layer, 5... Base material, 6
... Samochromic material layer, 7... Protective layer.

Claims (4)

[Claims] (1) A confidential leakage prevention document characterized by being made of a recording paper on which a special layer is formed on the surface of the base material, the layer state of which changes after a predetermined period of time. (2) A confidential leakage-preventing document characterized by being made of recording paper that has a special layer formed on the surface of the base material that changes its layer state when physical energy is applied. (3) A confidential leakage prevention document comprising a transfer ribbon having a special layer formed on the surface of a base material, the layer state of which changes after a predetermined period of time. (4) A confidential leak-preventing document comprising a transfer ribbon on the surface of a base material, which has a special layer that changes its layer state when physical energy is applied.