JPH01237787A - Ultraviolet recording medium - Google Patents

Abstract

PURPOSE:To effectively prevent a card from being unfaithfully used by encoding ink with ultraviolet ray absorbent in a same color as a substrate to a bar code shape for printing, and making visually observable a code number, etc. CONSTITUTION:On a card-shaped substrate 1 of a paper or a resin sheet, a code 2a is printed in the bar code shape with ink 2 with the ultraviolet absorber, whose is in the same color as the substrate 1 or colorless and transparent. In such a case, the code 2a can be visually observed. Next, in a reading device 5, a light emitting element 5b to emit an ultraviolet ray 5a and a photo-detecting element 5c to photo-detect the ultraviolet ray are provided. This substrate 1 is moved to a reading position by a belt 7 and a roller 6. Now, when the ultraviolet ray 5a is emitted from the element 5b, in a position where the ink 2 with the ultraviolet absorber is not printed, the ultraviolet ray 5a is reflected on the substrate 1 and this reflected ultraviolet ray 5a is read in the element 5a. Then, an output is obtained. In a position where the ink 2 with the ultraviolet ray absorber is printed, the ultraviolet ray 5a is absorbed by the ink 2 and not reflected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultraviolet recording medium capable of recording various information on a substrate such as a silver or resin sheet.

[Conventional technology]

As this type of recording medium, Japanese Patent Application Laid-Open No. 1983-1999. As disclosed in Japanese Patent No. 23931, magnetic ink recorded in the form of a bar code is known, and optical cards and the like are also known.

[Problem to be solved by the invention]

However, the above-mentioned recording medium had a drawback in that the recorded contents could be viewed visually using Magnepure or a microscope.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive ultraviolet recording medium in which recorded contents are not easily visible.

[Means to solve the problem]

The present invention is achieved by printing on a substrate an ink containing an ultraviolet absorber of a similar color (or transparency) to that of the substrate in the form of a barcode.

[Effect]

According to the present invention, areas printed with ink containing an ultraviolet absorber of a similar color to the substrate and areas not printed are coded and displayed, and the reflectance of the code is read to decipher the recorded content.

〔Example〕

The present invention will be explained in detail based on FIGS. 1 to 3.

In FIG. 1, reference numeral 1 denotes a card-like substrate made of silver or resin sheet, and a code 2a in the form of a bar code is printed on the substrate using ink 2 containing an ultraviolet absorber that is similar in color to the substrate or colorless and transparent. Note that the code 2a is shown in the drawing so that it can be seen visually for convenience.

Next, in FIG. 2, 5 is a reading device, and the reading device 5 is provided with a light emitting element 5b that emits ultraviolet rays 5a and a light receiving element 5c that receives violet λ rays.

6 and 7 are belt rollers for moving the substrate 1 to the reading position.

In this configuration, when the light emitting element 5b emits ultraviolet rays 5a, the ultraviolet rays 5a are reflected by the substrate 1 at positions where the ultraviolet absorbing ink 2 is not printed, and the light receiving element reads the reflected ultraviolet rays 5a. get the output. Further, at the position where the ultraviolet absorbing ink 2 is printed, the ultraviolet rays 5a are absorbed by the ultraviolet absorbing ink 2, so the ultraviolet rays 5a are not reflected.

In this way, by sequentially reading the information of the positions where the ultraviolet absorbing cut-in ink 2 is printed and the positions where it is not printed, an output as shown in FIG. 3, for example, can be obtained.

In addition, as described above, we use a combination of a bar code printed with ultraviolet absorbing ink and a conventional magnetic card, optical card, etc., and add a fixed code (PIN, ID, etc.) to the former.
D code, etc.), and a variable code (amount code, etc.) may be recorded in the latter, so that a card with sufficient usage and a high range of usage can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, by using ultraviolet-absorbing ink as a fixed code, effects such as preventing the person's personal identification number or ID code from being seen and misused are obtained, and the code is read-only. It is valid as a card.

[Brief explanation of the drawing]

FIG. 1 is a front view of a card showing an embodiment of the present invention, FIG. 2 is a block diagram of a card reading device according to an embodiment of the present invention, and FIG. 3 is a diagram showing the output of a card according to an embodiment of the present invention. be.

Claims (1)

[Claims] 1) An ultraviolet recording medium characterized in that an ultraviolet absorber-containing ink of a similar color to that of the substrate is printed on a substrate in the form of a barcode.