JPH01193850A - Photographic card - Google Patents

Abstract

PURPOSE:To prohibit falsification and to enable sure judging of whether a card is true or false by forming a pattern between sheets of either of two- layered synthetic resin sheets and specifying the transmission density of the base constituting parts sandwiching the pattern. CONSTITUTION:The card has the base consisting of a white polyethylene (PE) terephthalate sheet 11, white PE 12 and a white PE terephthalate film 13. A photographic emulsion layer of an image forming layer 3 is formed via an under coating layer 5 on the face of the PE terephthalate film 13 of the base and a back coating layer is formed on the face of the sheet 11. A writing layer 4 is formed on the face thereof. The transmission density of the base is specified to a 1.8-5.0 range, the transmission density of the pattern 2 to >=0.3 and the transmission density of both the base constituting parts on both sides to sandwich the pattern 2 to >=0.9. The easy falsification is thereby prohibited and whether the card is true or false is easily and surely judged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to photographic cards, ie cards whose support is provided with an imaging surface on one side. The photo card of the present invention can be used as various cards with an image formed on one side, such as for identification cards such as employee cards, passports, credit cards, driver's licenses, and traffic permits. It can be used as an authentication identification card (hereinafter collectively referred to as an authentication identification card) such as a driver's license or permit.

[Background of the invention]

Authentication identification cards that have been commonly used in the past are constructed by displaying certification details, a certifier's seal, patterns, symbols, etc. on the surface of the card using printing ink, paint, dye, or the like.

Therefore, such authentication identification cards can be imitated using color copying machines and color film, which have been particularly developed in recent years.
The risk of unauthorized use is increasing.

For this reason, in order to prevent forgery, falsification, and tampering of authentication identification cards, conventional methods include putting a face photo on the card or photo-composing the face photo and the certificate contents (Japanese Patent Application Laid-Open No. 1230-1989).
Attempts have also been made to laminate a card containing the certification details with a waterproof plastic sheet. However, this method alone is difficult to distinguish between genuine products and counterfeit products produced using color copying machines, color films, etc., and is insufficient to prevent fraudulent acts.

Therefore, in order to prevent such forgeries and alterations, it is necessary to use magnetic tapes or IC chips that store information, or to use moiré on the surface image, that is, to form an image with halftone dots, overlap the halftone dots, and pinch the halftone dots. Measures are sometimes taken to determine the authenticity of information, but these methods require large-scale equipment and are difficult to confirm, making them difficult to implement.

Among them, the authentication identification card with a built-in pattern shown in Japanese Patent Publication No. 58-45360 is easy to verify and is effective in preventing forgery and alteration.

However, the authentication identification card described in Japanese Patent Publication No. 58-45360 is preferable in that the pattern can be seen from the back side, but the pattern is built into the card and the pattern can be seen through the card (only through transmission). It is not necessarily preferable to use it in this manner. For example, it is not necessarily practical if only those involved know that a pattern is built in and try to judge authenticity based on this. The detection of the watermark pattern was insufficient within the density range of the card disclosed in the above publication, and on the other hand, if the density of the pattern was increased to improve the visibility effect through transmission, the pattern could be clearly observed from the back side. In fact, it looks like it's printed on the back, and the effect of having a built-in pattern is diminished. Furthermore, if an attempt is made to form a built-in pattern within the range described in the above-mentioned publication, a fairly strict standard is required for the density, which also poses a problem in terms of production yield.

[Purpose of the invention]

The present invention solves the above-mentioned problems of the prior art, prevents falsification such as forgery or falsification, is easy to manufacture, and can reliably determine authenticity using convenient means. We aim to provide photo cards that can

[Structure and operation of the invention]

The object of the present invention is to have a support made of at least two synthetic resin sheets, an image forming layer provided on one side of the support, and a writing layer provided on the other side of the support. , the transmission density of the support is in the range of 1.8 to 5.0,
and a pattern is formed between any one of the at least two synthetic resin sheets constituting the support, the transmission density of the pattern is 0.3 or more, and the support component on both sides sandwiching the pattern is All of these were achieved using photographic cards with a transmission density of 0.9 or higher.

That is, according to the present invention, with the above structure, and especially with the above concentration range, for example, in normal use, the built-in pattern cannot detect total heat, but can be sensed from the opposite side by strong light from one side. be able to. According to the above configuration, the built-in pattern is not detected on either side by reflected light, but the pattern can be misunderstood by applying strong transmitted light from one side of the photo card.
It can be easily obtained at low cost. In this way, it becomes easier to discover fraudulent imitations, especially if only the person concerned knows about the built-in pattern using an ID card or the like.

In addition, in the above support density range, the permissible width of the transmission density of the pattern is widened, and variations in the built-in pattern printing on the film, especially density unevenness on thick films, are no longer a problem.
Product yield is improved, which is advantageous in terms of productivity, quality, and cost.

The present invention will be explained in more detail below.

The photographic card of the present invention has an image forming layer provided on one side of a support. The image-forming layer can be configured as any photographic image-forming layer, for example, as a photosensitive image-forming layer made of a silver halide emulsion or the like. It is also a preferred embodiment to form a direct positive silver halide photographic forming layer.

In addition, it can be formed as an image-forming layer by transferring a diffusion transfer dye (for example, an image-receiving layer of a heat-developable photosensitive material), and may be used as various thermal transfer-type image forming layers.

Such an image forming layer may be formed on the entire surface of one side of the photo card, or may be formed partially, and can be appropriately set as necessary. For example, it is possible to print a photograph of one's face on a portion of one side of the card. It can be a color photo or a black and white photo.

The photographic card of the present invention has a support consisting of at least two layers of synthetic resin sheets. At least two layers of synthetic resin sheets can be joined to each other by adhesive or other means, and as a result, processing such as cutting is easier than in the case of a single layer sheet. Further, since the sheet is composed of at least two layers, a built-in pattern can be easily provided by forming a pattern on the inner surface of one of the sheets. On one side of such a support,
The image forming layer is provided.

When a pattern is formed on at least two layers of synthetic resin sheet, both sides of the pattern have a transmission density of 0.
．． It is 9 or more. The supports sandwiching the pattern are preferably white supports, but may be colored in various other colors as desired. And, the transmission density of the entire support consisting of at least two layers of synthetic resin sheets is 1.
．． It is between 8 and 5.0. Preferably it is in the range of 2.0 to 5.0.

More preferably, it is in the range of 2.0 to 4.0.

As a synthetic resin sheet for constructing such a support, any synthetic resin can be used as long as it has the above-mentioned transmission density. For example, as a synthetic resin material, polymers such as polyethylene, polypropylene, polystyrene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, mixtures thereof, or copolymers obtained by using two or more monomers for obtaining these synthetic resins. Examples include synthetic resins made of.

By whitening these synthetic resins, for example, desired opacity can be achieved. For this purpose, any appropriate means can be used, but for example, it is possible to make the support opaque by filling it into the synthetic resin material used for the support or by coating the support with an opacity agent. Can be done.

Opacifying agents that can be used include, for example, crystalline or amorphous silica, titanium oxide, magnesium oxide, zinc oxide, magnesium alumina silicate, barium sulfate, zinc sulfate, talc, clay, diatomaceous earth, and the like.

By using an appropriate amount of an opacifying agent, the above-mentioned transmission density can be achieved. Therefore, the amount of opacifying agent to be used is determined according to the desired transmission density, but in general, it is preferably about 3 to 20% by weight when filled into a synthetic resin material, and when coated on a support. It is 1 g/m or more, more preferably 3 g/m or more.

If it is desired to color it, an appropriate dye or the like can be mixed.

When using the above-mentioned polymer (including copolymer) as a support, a flat film can be obtained by kneading the above-mentioned opacifying agent into the polymer and extruding it, and this film can be shaped into a desired size. By cutting, a sheet constituting the support is obtained. Alternatively, an opaque layer may be provided by extruding a polymer into a flat plate and then applying an opaque agent or laminating an opaque film. It is also possible to knead an opacifying agent into the polymer, extrude it, and stretch it to form voids and increase the opacity.

In the photo card of the present invention, a pattern is formed between any of the sheets constituting the support. When the support consists of two layers of sheets, a pattern is formed between the two sheets, and three
When the sheet is composed of layers or more, a pattern is formed at any appropriate position on the boundary between two or more sheets.

In this specification, the term "pattern" is used to collectively refer to characters, symbols, and patterns formed between synthetic resin sheets.

Printing and stamping are common methods for forming patterns in the present invention, but are not limited thereto. Commercially available inks and pigments can be used, so they can be selected depending on the purpose, but the density after forming the pattern should be such that its transmission density is 0.3 or higher. .

Preferably it is in the range of 0.3 to 2.0. And it is desirable that the reflection density is 0.15 to 0.8. The optimum concentration depends on the intended purpose.

Also, the support component parts on both sides of such a pattern, that is, the support component part on one side separated by the pattern, and the support component part on the other side (therefore, if both are made of one layer of sheet) However, it may consist of two or more layers of sheets, and may have an adhesive material other than the sheet.Here, the support component refers to the entire component on one side of the sheet.) is its transmission density. are all 0.9 or more. Preferably it is in the range of 0.9 to 2.0.

In this specification, the transmission density is defined as follows. That is, it refers to the transmission density measured by a light transmission densitometer, provided that the measurement was carried out through a dinotene 111h106 filter (see J I 5-B-9560).

Further, in the photographic card of the present invention, a writing layer is formed on the opposite side of the support from the image forming side.

When the photo card of the present invention is used as, for example, an ID card, the writing layer is configured so that bibliographic information can be written, for example, by printing characters, or when the photo card of the present invention is used as, for example, a postal card. When used as a postcard, it is configured so that it can be stamped, written on with a pen, etc., or drawn on.

Therefore, when printing, the writing layer preferably does not roll up the print or smudge, and thus has good print coverage and is quick-drying.

In addition, the writing properties are good when drawing letters and pictures, and the stamp ink is also good (in that case, the ink dries quickly,
It is preferable that the ink does not bleed or fall off due to friction or the like.

As a means for forming such a writing layer, for example, there is a means for forming a layer mixed with an inorganic powder substance, and the writing layer can be formed using, for example, porous silica and gelatin. At this time, a gelatin hardening agent can be used as appropriate.

Alternatively, inorganic fine powder such as calcium carbonate, talc, diatomaceous earth, titanium oxide, barium sulfate, etc. is contained in a film of thermoplastic resin (polyolefins such as polyethylene, various copolymers, etc.), and the film is A writing layer can be formed by stacking the layers.

〔Example〕

Examples of the present invention will be described above. It should be noted that, as a matter of course, the present invention is not limited to the examples described below.

Example 1 (Preparation of photo card (1-A-C)) On a 125μ thick white polyethylene terephthalate film with a transmission density of 0.65, a transmission density of 0.30.0.
A pattern of No. 50.0.70 was printed, and a gelatin solution containing colloidal silica was applied to the surface opposite to the pattern printing surface to form a writing layer. As a result, the transmission density of the portion of the white polyethylene terephthalate film where the pattern was not printed was 0.68.

Next, molten polyethylene containing 8% titanium oxide was extruded, and this was coated with the above printed surface and undercoated with a transmission density of 1.
35 and a white polyethylene terephthalate film having a thickness of 175 μm. As a result, the transmittance density of the entire support in the area where no pattern was printed was 2.13.

A photographic emulsion was then coated on the surface of the latter polyethylene terephthalate film (with a transmission density of 1.35) by a conventional method.

This sample was aged (temperature 40℃, humidity 60% R11
After 4 days), punch out the following photo cards 1-A, 1
-B and 1-C were obtained.

Photo card 1-A... As schematically shown in Figure 1, the transmission density is 0.65 with a pattern 2 of 4 degrees of transmission 0.30.
A support 1 consisting of a white polyethylene terephthalate sheet 11, a white polyethylene 12, and a white polyethylene terephthalate film 13 with a transmission density of 1.35.
A photographic emulsion layer constituting the image forming layer 3 is formed on the surface of the polyethylene terephthalate film 13 of the support 1 via an undercoat layer 5, and a backing layer is formed on the surface of the sheet 11. is the writing layer 4.

Photo card 1-B...Photo card 1 except that the transmission density of the pattern is 0.50 as implied in FIG.
- Same as A.

Photographic card i-c...As implied in Figure 3, except that the transmission density of the pattern is 0.70, the photographic card l
- Same as A.

(Preparation of Photo Cards 2-A to 2-C) Transmission densities of 0.30, 0.50, and 125μ white polyethylene terephthalate film of 0.90, respectively.
A 0.70 pattern was printed, and a gelatin solution containing colloidal silica was applied to the surface opposite to the printed surface. As a result, the transmission density of the non-patterned portion of the white polyethylene terephthalate film was 0.93.

Next, molten polyethylene containing 8% titanium oxide was extruded, and this was coated with the above printed surface and undercoated with a transmission density of 1.
35 and a 175μ white polyethylene terephthalate film. This results in
The transmission density of the entire support in the area where the pattern is not printed is 2.
．． It became 38. A photographic emulsion was then coated on the surface of the latter polyethylene terephthalate film (transmission density 1.35) by a conventional method.

This sample was aged (4 days at a temperature of 40°C and a humidity of 60% RH) and then punched out to form the following photo cards 2-A to 2-C.
I got it.

Photo card 2-A... As implied in Figure 4, the transmission density is 0.9 with pattern 2 of transmission density 0.30.
0 white polyethylene terephthalate sheet 11, white polyethylene 12, and white polyethylene terephthalate film 13 with transmission density 1.35.
A photographic emulsion layer constituting the image forming layer 3 is formed on the surface of the polyethylene terephthalate film 13 of the support 1 via an undercoat layer 5, and a backing layer is formed on the surface of the sheet 11. is the writing layer 4.

Photo card 2-B...Photo card 2 except that the transmission density of the pattern is 0.50 as implied in FIG.
- Same as A.

Photo card 2-C...Photo card 2 except that the transmission density of the pattern is 0.70 as implied in FIG.
- Same as A・ , 2 B to Xu-Haku J 4! Example Z 1-A~-〇 and 2-A~- obtained in Example 1 Meshaji
The photographic card of No. C was subjected to exposure and development treatment and coated with LJV cured resin using the apparatus shown in JP-A No. 61-80135 to produce a photographic ID card.

Is it possible to detect the built-in pattern using reflected light on the photo ID card completed in this way, or is it possible to detect the built-in pattern using transmitted light (specifically, projected from one side with a flashlight and observed from the other side)? I observed that.

Table 1 In observation using reflected light, those that could not be detected from the back side were marked as ○, and those that could be detected were marked as ×. In addition, in observation using transmitted light, those that could be detected were marked as ○, and those that could not be detected were marked as ×.

As is clear from the results in Table 1, for cards 1-A, 1-B, and ic, which have low density sheets on the back side, the density of the built-in pattern makes it difficult for the pattern to be formed by light reflected from the back side. It may or may not be detected. Furthermore, considering the purpose of the present invention, which is that detection cannot be performed using reflected light but only by transmitted light, that is, detection can only be performed by scanning, the results show a somewhat different result.

In contrast, 2-A, 2-B, 2 according to the present invention
In the -C card, the pattern cannot be detected by reflected light, but can only be detected by transmitted light. Further, even if the transmission density of the pattern is changed from 0.50 to 0.70, there is no particular problem in terms of characteristics, and it can be seen that the permissible range of printing density has been expanded. Therefore, according to the photo card to which the present invention is applied, the ID
When used as a card, the purpose of preventing forgery and alteration due to the square pattern can be fully utilized.

Example 3 A writing layer containing clay was provided on one side of a void-containing polypropylene synthetic paper Yubo (manufactured by Tamago Yuka Synthetic Paper) 80 μm in order to further improve writing and printing properties. Next, molten polyethylene containing 8% titanium oxide was extruded, and the permeation density was 1.
．． 35 and laminated with a 175μ white polyethylene terephthalate film. As a result, the transmission density of the portion where no pattern was printed was 1.85. On the side opposite to the pasted side of this white polyethylene terephthalate film, the print density of transmission was 0.10.0.20.0.3.
0.0.40.0.60゜0.80.1. '00.1.
A pattern changed to 50.2.00.2.50 is printed. Furthermore, a 175 μm white polyethylene terephthalate film with a transmission density of 1.35 and undercoat processing was extruded and laminated thereon with molten polyethylene containing 8% titanium oxide between them. As a result, the transmission density of the entire support in the area where no pattern was printed was 3.30. Next, a photographic emulsion was coated by a conventional method. This sample was aged (4 days at a temperature of 40° C. and a humidity of 60% RH) and then punched out to produce an ID photo card.

This card is implied in Figure 7. The reference numerals are the same as in each of the examples described above, and reference numeral 14 indicates polypropylene synthetic paper. These photo cards were exposed according to Example 3;
After development treatment and U-curing/resin coating, the built-in printing was observed in transmitted light and reflected light.

As a result, good results were obtained in the squash pattern with a transmission density of 0.30 or more and 2.00 or less.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a photo card that cannot be easily tampered with, such as forgery or falsification, is easy to manufacture, and can be reliably determined to be authentic by simple means.

[Brief explanation of the drawing]

1 to 7 are sectional views of photo cards according to examples or comparative examples of the present invention. 11, 13.14...Synthetic resin sheet, 2...Pattern, 3...Image forming surface, 4...Writing layer Fig. 1 Fig. 2 (4tA (medium) Fig. 7

Claims (1)

[Claims] 1. It has a support made of at least two layers of synthetic resin sheets, an image forming layer is provided on one side of the support, and a writing layer is provided on the other side of the support. provided, the transmission density of the support is in the range of 1.8 to 5.0, and a pattern is formed between any one of the at least two synthetic resin sheets constituting the support, the pattern A photographic card having a transmission density of 0.3 or more, and a support component on both sides of the pattern having a transmission density of 0.9 or more.