JPH01142784A - Hologram card - Google Patents

Abstract

PURPOSE:To easily read information by deforming binarized information data and the clock data thereof to prescribed patterns and recording the same as Fresnel holograms. CONSTITUTION:A data pattern array 10 consisting of the bits binarized with the information to be recorded and a clock pattern array 20 for clocking the periods of the above-mentioned bit patterns are formed adjacently to each other to form an information pattern 30. The patterns 30 are then recorded as the Fresnel holograms on a photosensitive material and a hologram card 1 is produced by the conventional method. The data of the resulted card 1 and the card 1 are irradiated with monochromatic light 4 to reproduce the data pattern array 11 and clock pattern array 12 recorded on a recording medium 3. The data signal and clock signal are read as the signals of 0 and 1 by scanning a photodetector 5.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hologram card that can be used as a tally card, a bank card, a cash dispenser card, a telephone card, etc. The present invention relates to a hologram card that allows a device to easily read recorded hologram information using an optical method.

[Conventional technology]

Conventionally, in order to prevent forgery, theft, etc., the above-mentioned cards and the like have been printed with complicated designs and recorded with information using magnetic media.

Furthermore, in recent years, cards having diffraction gratings or holograms provided on or inside the card as a means to prevent counterfeiting, theft, etc. have come into practical use.

[Problem that the invention seeks to solve]

Holograms are capable of recording high-density information. Therefore, a hologram card using this as a means for preventing forgery will be a more effective means for preventing forgery and plagiarism if the information recorded by the hologram can be mechanically read. Furthermore, it is important from a practical point of view that such a hologram card can read the information with a simple device and has few errors.

However, the reality is that currently used hologram cards only use three-dimensional display-like holograms.

Although it is possible to determine the authenticity of these cards by visually checking the hologram image information, it is not possible to determine the authenticity of the cards by a machine, so there is a problem that they lack credibility. There is.

There are also examples of cards that use a diffraction grating to detect the direction of diffracted light when illuminated and perform mechanical discrimination, but with a diffraction grating, the amount of data that can be recorded is small, and it is easy to use. The problem is that only data can be recorded.

[Means for solving problems]

As a result of various studies to solve the above problems, the information recorded on the hologram is a binary data pattern so that it can be easily read mechanically, and furthermore, it is possible to read it with a simple device with fewer errors. , a clock pattern for taking a period corresponding to each bit of data is provided adjacent to the data pattern, and the entire pattern is converted into a light and dark pattern and recorded on a recording medium as a Fresnel hologram, and this recording medium is used as a card. We have completed this explanation by discovering that the above problem can be solved by creating a hologram card by adding

That is, the present invention converts binarized information data and clock data for determining the period of each bit of the information data into bright and dark patterns in adjacent parallel columns, and converts this pattern into a Fresnel pattern. The gist of the present invention is a hologram card, characterized in that a recording medium on which a hologram is recorded is formed on a card base material.

[Effect]

As shown in FIG. 4, when the recording medium 3 formed in the hologram card 1 of the present invention is irradiated with monochromatic light 4, an information pattern consisting of a data pattern array ]1 and a clock pattern array 21 can be spatially transmitted. Since it is recorded as a Fresnel hologram that can be imaged and reproduced, information is read by irradiating the recording medium 3 with monochromatic light 4 and scanning the patterned surface of the reproduced image with two photodetectors 6. be able to.

〔Example〕

EMBODIMENT OF THE INVENTION Below, one Example of this invention will be described in detail using drawings.

FIG. 1 is a perspective view of a hologram card 1 of the present invention,
A recording medium 3 is provided on a card base material 2, on which an information pattern consisting of a data pattern sequence and a clock pattern sequence is recorded as a Fresnel hologram. The position where the recording medium 3 is provided is not particularly limited, and it may be provided on the front and back sides of the card. The size of the recording medium 3 also depends on the size of other recording means provided on the card, such as magnetic tape or IC.
It can be of any size as long as it does not interfere with the functions of the chip, etc.

FIG. 2 shows a partial cross section of this recording medium 3.
This recording medium 3 has an adhesive layer 3I that adheres to the card base material 2.
It consists of a reflective layer 32 made of a metal thin film on the top and a relief surface [33] made of resin on the bottom, in which interference fringes of a Fresnel hologram are formed in an uneven shape. Although not shown, a protective layer made of resin can be provided on the hologram forming layer 33 if necessary.

Such a recording medium 3 can be created by the following method.

First, as shown in FIG. 3, there is a data pattern string 10 consisting of binary bits of information to be recorded, such as card expiration date, personal identification number, card forgery check symbol, etc.; An information pattern 30 formed adjacent to this data pattern row 10 and consisting of a clock pattern row 20 for determining the period of data bits is recorded on a photosensitive material as a Fresnel hologram. In the figure, the data pattern array 10 and the clock pattern array 20 are in contact with each other, but there may be a gap between them as long as it does not interfere with obtaining the period of data focus.

Moreover, the shape is not particularly limited, and is not limited to the illustrated rectangle.

This pattern 30 can be recorded as a Fresnel hologram by a conventionally known method. In the present invention, as subjects used for recording,
A transparent original such as a silver halide film in which the data pattern row and the clock pattern row are expressed as light and dark patterns is used, and a photoresist is used as the light-sensitive material, and the light and dark patterns interfere with each other on the photoresist. It is recorded as a relief-type Fresnel hologram in which stripes are recorded in an uneven shape.

Next, the uneven surface of the interference fringes recorded on this photoresist is plated with nickel, and this plating film is removed with #1 to create a metal plate with the uneven shapes of the interference fringes formed on the surface. Using a plate as an embossing plate, a hologram transfer foil on which a plurality of recording media 3 are formed is created by an embossing duplication method. Since the recording medium produced by this method is formed as a very thin film, it is suitable for being provided on a card base material. As this emboss reproduction method, the method described in Japanese Patent Application Laid-Open No. 60-254175 by the present applicant can be used.

The hologram card 1 of the present invention can be obtained by transferring the recording medium 3 onto the card base material 2 by hot stamping or the like using the transfer foil produced as described above.

As the card base material 2, a general card can be used. For example, a credit card, a bank card, an ID card, a telephone card, an orange card, etc.
It can be used without selecting the material that makes up the card.

FIG. 4 is a diagram schematically showing a method for reading data from the hologram card of the present invention obtained as described above.

First, the recording medium 3 of the hologram card 1 is irradiated with monochromatic light 4 such as a laser beam to reproduce reproduced images of the data pattern sequence 11 and the clock pattern sequence 21 recorded on the recording medium 3 at predetermined positions.

Next, a photodetector 5 is placed on the array line of each reproduced pattern, and this photodetector 5 is scanned along the array of the reproduced pattern. the result,
Through the photodetector 5, a data signal 12 and a clock signal 22 as shown in FIG. 5 are obtained as the intensity of light intensity,
This can be interpreted as a signal of 0, ■.

Further, instead of scanning the photodetector 5, a signal similar to that described above can be obtained through the photodetector 5 by moving the card 1 itself in a direction parallel to the pattern arrangement.

Since the processing of the obtained data signal can be performed based on the clock signal 22, errors can be avoided regardless of the scanning speed of the photodetector 5 or the moving speed of the card 1, that is, even if these speeds are uneven. data can be read without any problems.

As described above, the hologram card of the present invention is a card provided with a recording medium in which a data signal and a clock signal are recorded as a Fresnel hologram, so it can be used as a credit card, ID card, bank card, etc.
It can be used as an identification card such as a cash card, or as a prepaid card such as a telephone card or a ticket card.

〔Effect of the invention〕

The hologram card of the present invention has the following advantages.

- Since information is recorded as a Fresnel hologram on the recording medium formed on the hologram card, there is a high degree of redundancy in recording, and the information is highly resistant to scratches and dirt. Furthermore, the information cannot be read using normal white light, making the information highly confidential.

■ Information is recorded as binary bits, so a large amount of information can be recorded, and since each focus is accompanied by a clock signal, accurate reading is possible using a simple device. .

■Holograms are difficult to forge by copying, etc., and by providing them on cards, the security against card forgery increases.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a hologram card of the present invention, FIG. 2 is a partial sectional view of a recording medium used in the present invention, FIG. 3 is a plan view of an information pattern recorded as a hologram, and FIG. FIG. 4 is an explanatory diagram illustrating the hologram card reading method of the present invention, and FIG. 5 is a diagram showing signals detected by the method of FIG. 4. l--Hologram card 2--Card base material 3--Recording medium 4--Monochromatic light 5--Photodetector 10--Data pattern Column 11--Reproduced image of data pattern column 12...-Data signal 20--Clock pattern column 21--Reproduced image of clock pattern column 22--1111 Clock signal FIG.

Claims (1)

[Claims] Binarized information data and clock data for determining the period of each bit of the information data are converted into bright and dark patterns in adjacent parallel columns, and this pattern is recorded as a Fresnel hologram. A hologram card characterized in that a recording medium is formed on a card base material.