JP2014168927A - Tabular transfer original plate for security card, method for manufacturing tabular transfer original plate for security card, and method for manufacturing security card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tabular transfer original plate for security cards, the original plate having less deformation and excellent releasability and enabling security cards having high visibility to be inexpensively and simply manufactured.SOLUTION: A tabular transfer original plate for security cards includes: a metal substrate having a flat-surface part and a lenticular lens formation part on one surface; and a plating layer formed so as to cover at least the lenticular lens formation part of the metal substrate. The lenticular lens formation part includes a plurality of linear concave surface parts linearly arranged in parallel and partition parts formed between the adjacent linear concave surface parts.

Description

  The present invention relates to a transfer master for a flat plate-like security card, which can easily produce a security card with high visibility at a low cost, has little deformation, and has excellent releasability.

  In the past, security cards such as ID cards, various membership cards, credit cards, etc. (hereinafter, “security cards” may be abbreviated as “cards”) ensure that the card owner and card user are identical. As a so-called personal identification function for confirmation, a function in which an image such as an owner's personal information or a photograph is displayed on the card surface is generally used. In recent years, in order to prevent these images from being falsified and forged, a security card having an anti-counterfeit function on the image surface is used.

  As a method of imparting a forgery prevention function, for example, there is a method of providing a lenticular lens on a card substrate of a security card. A lenticular lens has a plurality of linear lenses (hereinafter referred to as “semi-cylindrical lens”) having a convex lens shape in cross section and a substantially semi-cylindrical side surface arranged in parallel at equal intervals. It has a shape, and has a condensing function of the lens only in a direction having a convex lens-shaped cross section. In the security card, by providing a lenticular lens on the image of personal information etc. to be displayed, when observing the security card from the specific observation angle through the lenticular lens, the observation angle from the image part of the card substrate Therefore, it is possible to make a security card with high visibility (Patent Documents 1 to 3).

  However, in the case where the above-described security card is produced in a variety of products and in a small lot, for example, a lenticular lens is provided on the surface of the card by, for example, forming a lenticular lens separately after being separately formed with a mold roll. There is no known transfer master plate that can be used to produce a security card with a lenticular lens easily and accurately at low cost.

JP-A-9-311204 JP 2000-298319 A JP 2008-77711 A

  The present invention has been made in view of the above circumstances, and can be used to easily produce a security card with high visibility at low cost, and with less deformation and excellent releasability. The main purpose is to provide

  The present invention includes a metal substrate having a planar portion and a lenticular lens forming portion on one surface, and a plating layer formed so as to cover at least the lenticular lens forming portion of the metal substrate, and the lenticular lens The forming portion includes a linear concave curved surface portion in which a plurality of straight portions are arranged in parallel and a partition wall portion formed between the adjacent linear concave curved surface portions. Provides a flat plate security card transfer master (hereinafter sometimes simply referred to as a card master).

According to the present invention, the flat surface portion and the lenticular lens forming portion are directly formed on the surface of the metal substrate, and it is possible to obtain a transfer master plate for a flat plate security card that is inexpensive and accurate.
Moreover, a security card can be collectively formed by using the security card transfer master of the present invention. At this time, not only can the lenticular lens be accurately formed at a desired position on the card surface, but also the transfer surface of the flat portion can be flattened, and the thickness of the entire card can be made uniform. Therefore, a security card with high dimensional accuracy can be produced.
Furthermore, information such as letters, symbols, and symbols can be printed on the card substrate through the semi-cylindrical lens that constitutes the lenticular lens. Since the semi-cylindrical lens is accurately formed at a desired position, printing can be performed at an accurate position on the card substrate. For this reason, different images can clearly appear through the lenticular lens according to the observation angle, and a highly visible security card can be produced.
Further, since the plating layer is formed, the lenticular lens forming portion can be less deformed, can withstand repeated use, and cost can be reduced.
Furthermore, since the plating layer is formed, the surface smoothness can be excellent, and the mold release property can be excellent.

  In the said invention, it is preferable that the said plating layer has a laminated structure on which the electrolytic plating layer and the electroless plating layer were laminated | stacked in this order on the said metal substrate. This is because the plating layer can be excellent in hardness, and can be less deformed.

  The present invention covers a metal substrate preparation step of preparing a metal substrate having a planar portion and a lenticular lens formation portion on one surface, and covers at least the lenticular lens formation portion of the metal substrate prepared by the metal substrate preparation step. A plating layer forming step for forming a plating layer as described above, wherein the lenticular lens forming portion is a linear concave curved surface portion in which a plurality of linear lenticular lenses are arranged in parallel, and the adjacent linear concave curved surface portion And a partition wall portion formed between the two, a method for producing a flat plate security card transfer original plate.

  According to the present invention, it is possible to easily obtain a plating layer formed so as to cover the flat portion and the lenticular lens forming portion of the metal substrate by the plating layer forming step.

  In the present invention, after laminating a sheet base material on one surface of the card base material, the pattern of the transfer original plate for a flat plate security card is transferred to the surface of the sheet base material. A transfer step of making a lenticular lens sheet having a flat portion and a lenticular lens, and irradiating the card substrate with laser light from two different directions through the lenticular lens formed by the transfer step, and the lenticular lens And a printing process for forming an image portion on the card base so as to overlap in plan view, wherein the lenticular lens is a semi-cylinder in which a plurality of lenticular lenses are linearly arranged in parallel And a lens-to-lens groove formed between the adjacent semi-cylindrical lenses. The plate-shaped security card transfer master used in the process was formed so as to cover at least the lenticular lens forming portion of the metal substrate having a flat portion and a lenticular lens forming portion on one surface. A plating layer, and the lenticular lens forming portion includes a linear concave curved surface portion in which a plurality of linear lenticular lenses are arranged in parallel, and a partition wall portion formed between the adjacent linear concave curved surface portions. A security card manufacturing method is provided.

According to the present invention, by using the plate-shaped security card transfer master, the lenticular lens is accurately formed at a desired position of the sheet substrate in the transfer process, and at the same time, a sheet flat portion having high smoothness is formed. can do. This makes it possible to collectively form a lenticular lens sheet having a desired uneven shape.
In addition, since the thickness of the lenticular lens sheet can be made high by batch formation, the thickness of the entire card can be made uniform. Thereby, a security card with high dimensional accuracy can be produced with high productivity.
Furthermore, since a lenticular lens with high dimensional accuracy and placement accuracy is formed in the transfer process, when observing the image portion through the lenticular lens, different information on the image portion is clearly displayed according to the observation angle. Can do.
Thus, a security card with high dimensional accuracy and excellent visibility can be easily and inexpensively manufactured.
Moreover, a security card can be stably obtained by using the plate-shaped security card transfer master having a plating layer.

  The present invention produces an effect that a security card with high visibility can be easily produced at low cost, and further, a transfer original plate for a flat security card with little deformation and excellent releasability can be provided.

It is a schematic sectional drawing which shows an example of the transcription | transfer original plate for flat plate security cards of this invention. It is the XX sectional view taken on the line of FIG. It is a schematic sectional drawing which shows the other example of the transcription | transfer original plate for flat plate security cards of this invention. It is explanatory drawing regarding the printing method in this invention. It is explanatory drawing explaining the partition part in this invention. It is explanatory drawing which shows an example of the security card formed using the transcription | transfer original plate for flat plate security cards of this invention. It is a schematic sectional drawing which shows an example of the plating layer in this invention. It is a schematic sectional drawing which shows the other example of the plating layer in this invention. It is a schematic sectional drawing which shows the other example of the plating layer in this invention. It is process drawing which shows an example of the manufacturing method of the transcription | transfer original plate for flat plate security cards of this invention. It is process drawing which shows an example of the manufacturing method of the security card of this invention.

  Hereinafter, the flat plate security card transfer master, the flat plate security card manufacturing method, and the security card manufacturing method of the present invention will be described in order.

A. First, the flat plate security card transfer master of the present invention will be described. The transfer master for a flat security card of the present invention comprises a metal substrate having a planar portion and a lenticular lens forming portion on one surface, and a plating layer formed so as to cover at least the lenticular lens forming portion of the metal substrate. The lenticular lens forming portion has a linear concave curved surface portion in which a plurality of linear lenticular lenses are arranged in parallel and a partition wall portion formed between the adjacent linear concave curved surface portions. It is characterized by being.

The card original plate of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view showing an example of a card master according to the present invention, and FIG. 2 is a cross-sectional view taken along line XX of FIG. FIG. 3 is a schematic cross-sectional view showing another example of the card original plate of the present invention.
As illustrated in FIGS. 1 to 3, a card original plate 10 according to the present invention includes a flat metal substrate 1 in which a flat portion 2 and a lenticular lens forming portion 3 are formed on one surface, and the metal substrate. 1 and the plating layer 9 formed so as to cover the flat portion 2 and the lenticular lens forming portion 3. The lenticular lens forming portion 3 has a linear concave curved surface portion 4 in which a plurality of linear lenses are arranged in parallel and a partition wall portion 5 formed between adjacent linear concave curved surface portions 4. doing.
In FIG. 3, the description of the plating layer is omitted for ease of explanation.

In the present invention, a flat portion, a lenticular lens forming portion having a linear concave curved surface portion and a partition wall portion are formed directly on the surface of the metal substrate, so that an inexpensive and accurate card master can be obtained. .
Also, by using the card master of the present invention, a security card having a lenticular lens formed in a desired position and a flat region (hereinafter sometimes referred to as “sheet flat portion”) can be produced. it can.
In general, security cards such as IC cards and various certification cards are stipulated in international standards (for example, ISO7816), and high accuracy is required for the size, shape, thickness, etc. of the cards. .
In the master for card of the present invention, since the shape of the lenticular lens forming part is highly accurate, the lenticular lens obtained by transfer can be highly accurate. In addition, since the flat portion has high surface smoothness, the obtained flat sheet portion can have high flatness.
Furthermore, by pressing and heating the entire card in a state where the card original plate of the present invention is pressed, the irregular shape on the surface of the card original plate is transferred, and the irregular shape such as the lenticular lens described above is formed on the card surface. Batch formation is possible. For this reason, the card | curd obtained can make the whole thickness uniform.
Thus, the card master of the present invention enables not only a security card to be easily produced at low cost, but also the resulting card to have high dimensional accuracy.

  Furthermore, when printing information such as characters, symbols, designs, etc. on the card substrate through the semi-cylindrical lens constituting the lenticular lens, the lenticular lens is accurately formed at a desired position. Can be printed at an accurate position. For this reason, different images can appear clearly through the lenticular lens according to the observation angle, and a highly visible security card can be produced.

In addition, since the plating layer is formed, security is achieved by thermocompression bonding of the card master plate to the security card substrate as compared to the case where the metal substrate is directly contacted with the security card substrate as the card master plate. Deformation of the lenticular lens forming part, etc. caused by friction due to the difference in thermal expansion between the card original plate and the security card substrate when manufacturing the card, specifically, a fine part such as a partition part included in the lenticular lens forming part It is possible to reduce deformation of the columnar convex portion.
For this reason, it is possible to withstand the repeated use of the card original, and it is possible to reduce the cost by reducing the replacement frequency. In addition, it is possible to stably obtain a security card, such as preventing the occurrence of a transfer-defective security card due to deformation of the card original pattern.
Furthermore, since the plating layer is formed, the surface smoothness can be excellent, and the mold release property can be excellent.

The card original plate of the present invention has a metal substrate and a plating layer.
Hereinafter, each structure of the card | curd original plate of this invention is demonstrated in detail.

1. Metal substrate The metal substrate in this invention has a plane part and a lenticular lens formation part on one surface.

(1) Lenticular lens forming portion The lenticular lens forming portion in the present invention is formed on one surface of a metal substrate, and a linear concave curved surface portion in which a plurality of straight lines are arranged in parallel. It has a partition part formed between the said said linear concave curved surface part.
The lenticular lens forming portion is formed by shaping the surface of the metal substrate described above into the shape of the linear concave curved surface portion and the partition wall portion.
Also, each size of the lenticular lens forming portion, more specifically, the width, depth, pitch width, bottom curvature, etc. of the linear concave curved surface portion, the top width of the partition wall portion, the curvature, the partition wall portion, etc. The size such as the height and the ratio of the area occupied on one surface of the metal substrate indicate the sizes appearing on the plating layer surface when the plating layer is formed. Accordingly, specific sizes of the lenticular lens forming portion and the partition wall portion formed on the metal substrate are formed in consideration of the thickness of the plating layer in each of the above sizes.

(A) Linear concave curved surface portion The linear concave curved surface portion in the present invention is a plurality of linear linearly arranged in parallel on the surface of the metal substrate. In addition, the said linear concave curved surface part is a part which is transcribe | transferred when producing a security card using the card | curd original plate of this invention, and forms a semi-cylindrical lens. Moreover, one lenticular lens is formed by arranging a plurality of semi-cylindrical lenses in parallel.

The width of the linear concave curved surface portion in the present invention is appropriately set according to the shape of the lenticular lens formed on the security card by transfer, but is preferably in the range of 20 μm to 200 μm, for example, In particular, it is preferably in the range of 40 μm to 120 μm, and particularly preferably in the range of 50 μm to 70 μm.
When the width of the linear concave curved surface portion is larger than the above range, the height of the linear concave curved surface portion is relatively large when a card original plate is manufactured by photolithography. For this reason, the heights of the semi-cylindrical lens and the lenticular lens formed by the transfer are also increased, which may exceed the thickness of the card determined by the standard or the like.
On the other hand, if it is smaller than the above range, when producing a card original by photolithography, the stability of the resolution cannot be ensured during patterning, and the variation of the shape of the linear concave curved surface portion may increase. Therefore, the shape of the semi-cylindrical lens formed by the transfer also varies, and when the image portion is viewed through the lenticular lens, the uniformity of the image may not be ensured.
In addition, the width | variety of a linear concave curved surface part refers to the length between the side surfaces of the short direction of a linear concave curved surface part, and means the part shown by a in FIG.

The width of the linear concave curved surface portion can be measured by a non-contact method using an optical interference type surface shape measuring device (for example, VertScan 2.0 manufactured by Ryoka System Co., Ltd., Wyko NT9000 series manufactured by Veeco Co., Ltd.). . Specifically, the linear concave curved surface portion is placed on the measurement stage of the optical interference type surface shape measuring device with the measuring head facing, and the linear concave curved surface portion surface shape data is a set of three-dimensional coordinate data. In a non-contact manner and can be calculated based on the surface shape data.
In the following description, unless otherwise specified, the measurement method for each component part of the card master of the present invention is the same as the measurement method described above, with each component part placed on the measurement head. Shall be measured using.

The pitch width of the linear concave curved surface portion is preferably small, but is preferably larger than the width of the linear concave curved surface portion described above. The pitch width is preferably in the range of 30 μm to 200 μm, more preferably in the range of 50 μm to 130 μm, and particularly preferably in the range of 60 μm to 100 μm.
When the pitch width of the linear concave curved surface portion is larger than the above range, the arrangement interval between the adjacent linear concave curved surface portions becomes large, and the arrangement interval of the semi-cylindrical lenses formed on the security card also becomes large. For this reason, the individual semi-cylindrical lenses become visually noticeable, which may be undesirable in terms of the appearance of the card. On the other hand, if the width is smaller than the above range, the width of the linear concave curved surface portion is also reduced, and the lens shape may be lost when a semi-cylindrical lens is formed by transfer.
In addition, the pitch width of a linear concave curved surface part means the distance between the centers of adjacent linear concave curved surface parts, and means the part shown by b in FIG.

The linear concave curved surface portion has a curvature at the bottom thereof, but the curvature of the bottom of the linear concave curved surface portion (hereinafter sometimes simply referred to as “the curvature of the linear concave curved surface portion”). Depending on the size of the card, there are cases where a security card having a dimensional shape defined by a standard or the like cannot be manufactured, or the visibility of the card is lowered. Therefore, the linear concave curved surface portion needs to have a desired curvature.
Hereinafter, the reason will be described with reference to the drawings.

FIG. 4 is an explanatory diagram relating to a printing method using laser light irradiation through a semi-cylindrical lens when a security card is manufactured. As illustrated in FIG. 4, as a printing method on the security card, the coloring material contained in the card base 12 is irradiated with laser light (Z1 and Z2) or the like via the semi-cylindrical lens 13. Thereby, the irradiated part is colored and an image part can be formed.
As described above, the linear concave curved surface portion is a portion that is transferred to form a semi-cylindrical lens. That is, the curvature of the top of the semi-cylindrical lens is determined by the curvature of the linear concave curved surface.
Here, for example, when the curvature of the linear concave curved surface portion is large, the curvature of the formed semi-cylindrical lens is also large. That is, the semi-cylindrical lens has a shape with a small radius of curvature.
In this case, as illustrated in FIG. 4A, the laser beams Z1 and Z2 transmitted through the semi-cylindrical lens 13 have a focal point F in the lenticular lens sheet 11, and reach the card base 12. The card base material 12 cannot be printed.
At this time, in order to have the focal point of the laser beam on the card substrate, it is necessary to reduce the thickness of the lenticular lens sheet, which may reduce the strength of the sheet.

On the other hand, for example, when the curvature of the linear concave curved surface portion is small, the curvature of the formed semi-cylindrical lens is also small. That is, the semi-cylindrical lens has a shape with a large curvature radius.
In this case, as illustrated in FIG. 4B, the laser beams Z1 and Z2 transmitted through the semi-cylindrical lens 13 have a focal point F at a position beyond the card substrate 12, and thus the card substrate 12 described above. There is a possibility that printing cannot be performed.
At this time, a method of increasing the thickness of the lenticular lens sheet so that the focal point is located on the card substrate is also conceivable. However, since the range in which the laser beam actually reaches is determined, it is estimated that the laser beam does not reach the focal point F sufficiently, and that the intensity of the laser beam at the focal point F decreases. For this reason, it may be difficult to print clearly on the card substrate.
Further, when the thickness of the lenticular lens sheet is increased, the thickness of the entire security card is also increased, so that there may be a case where a card having a dimension and shape defined by international standards or the like cannot be produced.

For the above reasons, in order to obtain a security card having a clear image portion at a predetermined location on the card substrate and having a high visibility, the card should be such that the curvature of the semi-cylindrical lens is within a desired range. It is necessary to define the curvature of the linear concave curved surface portion of the original plate.
The radius of curvature of the linear concave curved surface portion is preferably within a range of 10 μm to 100 μm, more preferably within a range of 30 μm to 90 μm, and particularly preferably within a range of 50 μm to 80 μm.
In addition, the curvature radius of a linear concave curved surface part means the part shown by c in FIG.

The depth of the linear concave curved surface portion is preferably within a range of 5 μm to 100 μm, more preferably within a range of 7 μm to 60 μm, and particularly preferably within a range of 10 μm to 50 μm. .
When the depth of the linear concave curved surface portion is larger than the above range, the lens thickness of the semi-cylindrical lens formed by transfer increases. That is, since the lens thickness of the lenticular lens also increases, there is a possibility that the thickness of the entire card determined by international standards or the like may be exceeded. On the other hand, if it is smaller than the above range, the semi-cylindrical lens formed by the transfer does not have a desired lens thickness, and the function as a lens for switching display of image information may not be sufficiently exhibited.
If the depth of the linear concave curved surface portion is out of the above range, in the production of a security card, when an image is printed on the card substrate by irradiating the laser beam, the laser beam transmitted through the semi-cylindrical lens is There is a possibility that printing cannot be performed at a desired position without focusing on the substrate.
In addition, the depth of a linear concave curved surface part means the length from the lowest point of a linear concave curved surface part to the top part (most vertex) of the partition part mentioned later, and means the part shown by d in FIG.

As illustrated in FIG. 1, the linear concave curved surface portions are formed in a plurality of lines in parallel on the surface of the metal substrate, and the number of the linear concave curved surface portions is appropriately selected. be able to.
Further, the length of the linear concave curved surface portion in the longitudinal direction is not particularly limited, and is appropriately selected according to the size of the metal substrate and the desired size of the lenticular lens. In addition, the elongate direction of a linear concave curved surface part means the direction shown by A in FIG.

(B) Partition Wall The partition wall in the present invention is formed between adjacent linear concave curved surface portions on a metal substrate. The partition walls are also formed linearly on the surface of the metal substrate, and the number thereof is determined according to the number of the linear concave curved surface parts formed.

The shape of the partition wall in the present invention is not particularly limited as long as it has a desired width, height, and the like. FIG. 5 is an explanatory diagram for explaining an example of the vertical cross-sectional shape of the partition wall.
As the cross-sectional shape of the partition wall, as illustrated in FIG. 5A, the side surface of the partition wall is generally perpendicular to the bottom surface of the metal substrate. The shape (taper shape) which makes an obtuse angle may be sufficient so that it may be illustrated by c). As a magnitude | size of the angle ((theta) in FIG.5 (b) and (c)) which the both sides | surfaces of the said partition part make, the inside of the range of 5 degrees-120 degrees is preferable, and the inside of the range of 10 degrees-90 degrees is especially preferable. The range of 15 ° to 45 ° is particularly preferable.
This is because, when the both side surfaces of the partition wall form an angle within the above range, the card is easily released from the card master during transfer.

  Moreover, it is preferable that the width | variety of the top part of the said partition part is small. The partition wall portion is a portion where an inter-lens groove portion is formed by transfer, but when the inter-lens groove portion is large, when the image portion is observed from a predetermined angle through a lenticular lens, a line is displayed on the displayed image. Phenomenon that noise noise appears. For this reason, the image to be displayed is observed as an unclear image, and the visibility of the security card is reduced.

Here, a security card formed using the flat plate security card transfer master of the present invention will be described with reference to the drawings. FIG. 6A is a schematic cross-sectional view showing an example of a security card formed by transfer using the plate-shaped security card transfer master of the present invention. The security card 20 according to the present invention has a card base 12 and a lenticular lens sheet 11 formed on the card base 12. The card substrate 12 has an image portion 18 (18a and 18b), and the lenticular lens sheet 11 has a sheet flat portion 15 and a lenticular lens 16.
The lenticular lens 16 has a semi-cylindrical lens 13 in which a plurality of lenticular lenses are arranged in parallel, and an inter-lens groove 14 formed between the adjacent semi-cylindrical lenses 13. The lenticular lens sheet 11 is disposed on the surface of the card base 12 on the side where the image portion 18 is formed. Further, the image portion 18 on the card substrate 12 is located below the semi-cylindrical lens 13 and is disposed so as to overlap the lenticular lens 16 in plan view.
Then, as illustrated in FIGS. 6A to 6C, only the information (FIG. 6B) of the image portion 18a on the card substrate is imaged through the lenticular lens 16 at one observation angle E1. It is possible to visually recognize only the information (FIG. 6C) of the image portion 18b on the card substrate through the lenticular lens 16 at another observation angle E2.
In such a security card, the phrase “linear noise or the like appears on the image displayed via the lenticular lens” means that the security card passes through the lenticular lens as illustrated in FIG. When confirming an image, a phenomenon in which a thin portion of the image is linearly formed in the longitudinal direction of the lenticular lens, or in addition to an image to be displayed at a predetermined angle, there are a plurality of images other than the image to be displayed. This refers to a phenomenon that is simultaneously displayed as the linear noise L.

The cause of the appearance of linear noise or the like on the visually recognized image is considered to be due to the size of the bottom width of the inter-lens groove.
When visually recognizing the security card from a predetermined angle, the image portion on the card substrate is visually recognized through the lenticular lens. However, when the bottom width of the inter-lens groove is large, the relationship between the refractive index of the surface of the inter-lens groove and the bottom width of the inter-lens groove, the region where the image portion is not formed through the inter-lens groove, A region other than the image portion to be visually recognized through the lenticular lens (which may be referred to as a non-image portion region) is also visually recognized. For this reason, an observer will visually recognize simultaneously the image of the image part which should be visually recognized via a lenticular lens, and the non-image part area | region visually recognized via the groove part between lenses.
At this time, the non-image portion area appears as linear noise or the like on the visually recognized image as described above, so that the visually recognized image is damaged and the entire image is recognized as being unclear.
Therefore, in the present invention, the occurrence of the above phenomenon is prevented by adjusting the size of the bottom width of the inter-lens groove to be within a predetermined range.

The width of the top of the partition wall is preferably in the range of 5 μm to 20 μm, more preferably in the range of 5 μm to 15 μm, and particularly preferably in the range of 5 μm to 10 μm.
If the width of the top of the partition wall is smaller than the above range, the partition wall breaks and the depth of the above-mentioned linear concave surface portion varies, so that the semi-cylindrical lens and the lenticular lens formed by transfer are There may be no function as a lens. On the other hand, if it is larger than the above range, the bottom width of the inter-lens groove portion also becomes large, so when observing the image portion through the lenticular lens, linear noise or the like appears on the display image, and the visibility is impaired. May be.
In addition, the width | variety of the top part of a partition part means the length of a short direction among the planes which have the top part of a partition part, and means the part shown by e in FIG. Moreover, when the top part of a partition part has a curvature so that it may mention later, the width | variety of the surface formed when the curved surface of the top part of a partition part is cut | disconnected by the plane parallel to the surface of a metal substrate is said.

About the measurement part of the width | variety of the top part of the said partition part, when the side surface of a partition part forms a right angle with respect to the surface of a metal substrate so that it may illustrate in Fig.5 (a), between the said side surfaces The distance is defined as the width of the partition wall.
Further, as illustrated in FIG. 5B, when the side surface of the partition wall forms an obtuse angle with respect to the surface of the metal substrate, the length in the short direction in the plane at the top of the partition wall is set to Width.
Furthermore, as illustrated in FIG. 5C, the top of the partition wall has a curvature, and the linear concave curved surface and the curved surface of the top of the partition are continuous, and the top of the partition is When the position where the curved surface is divided is not clear, the inflection point of the curved surface formed by the linear concave curved surface portion and the top curved surface of the partition wall portion is specified in the graph created by the non-contact method measurement. That is, the position at which the sign of the curvature of the curve formed by the cross section in the short direction of the linear concave curved surface portion and the partition wall portion on the target curved surface is a position where the linear concave curved surface portion and the top of the partition wall portion are separated. The length in the short direction at the inflection point is defined as the width of the partition wall. Here, as one method for calculating the curvature from the curve formed by the cross section in the short direction, the curve is divided into minute sections, and the least square method is used for the measurement data constituting the curve in the minute section for calculating the curvature. An example is a method in which a circular arc is applied and the curvature is obtained from the radius of the obtained circular arc.
In addition, when the straight line part is in contact with the inflection point, the straight line part is also a part of the straight concave curved surface part.

The top of the partition wall preferably has a curvature. This is because when the top of the partition wall has a curvature, the card is easily released from the card master during transfer. Further, in the card, linear noise appearing on an image visually recognized through the lenticular lens can be made less noticeable.
The radius of curvature of the top of the partition wall is preferably in the range of 2.5 μm to 10.0 μm, and more preferably in the range of 2.5 μm to 7.5 μm. In particular, it is preferably in the range of 2.5 μm to 5.0 μm.
In addition, the curvature radius of the top part of a partition part means the part shown by R in FIG.

The height of the partition wall is the same as the depth of the linear concave curved surface described above.
Moreover, it is preferable that the plane which has the top part of the said partition part exists in the same height as the plane part which has on the surface of the metal substrate mentioned later. That is, it is preferable that the height from the bottom surface of the metal substrate of the present invention to the flat surface at the top of the partition wall is the same as the thickness of the metal substrate of the present invention.
The height of the partition wall is indicated by d in FIG.

(C) Lenticular lens forming portion The number of lenticular lens forming portions in the present invention is formed on a part of the surface of the metal substrate, and the number may be one or plural. When the number of lenticular lens forming portions on the metal substrate is one, it can be a single-sided card master. In other words, one security card can be produced by attaching to one original card for the above-described aspect in one production.
Moreover, when the number of the lenticular lens forming parts on the metal substrate is plural, the card original plate in a multi-faceted manner can be obtained. That is, it is possible to produce a plurality of security cards by attaching to one card master of the above aspect in one production.

Further, when a plurality of the lenticular lens forming portions are provided, the longitudinal direction of the linear concave curved surface portion in one lenticular lens forming portion is the same as the longitudinal direction of the linear concave curved surface portion in the other lenticular lens forming portion. May be in different directions, but preferably in the same direction.
Further, the longitudinal direction of the linear concave curved surface portion in the lenticular lens forming portion is the longitudinal direction of the security card produced using the flat plate security card transfer master of the present invention, that is, the security card as a card reader. The direction is preferably the same as the direction in which the magnetic information is read through. This is because when the security card is passed through the card reader, the portion of the lenticular lens may become an obstacle.

  Moreover, the ratio of the area which occupies one surface of the metal substrate of the lenticular lens forming part in the present invention may occupy a ratio of about 1% to 30% when the area of one surface of the metal substrate is 100%. preferable.

(2) Plane portion The plane portion in the present invention refers to a region that does not have the above-described lenticular lens forming portion on one surface of the metal substrate. The plane portion is formed by directly forming the surface of the metal substrate described above into the shape of the plane portion.

As shown in FIG. 3, it is preferable that the flat portion is formed with a character / symbol transfer portion 6. The character / symbol transfer unit has image information such as characters, symbols, and symbols expressed by unevenness. For this reason, when a security card is produced using the card original plate of the present invention, the image information of the character / symbol transfer portion can be transferred simultaneously with the formation of the lenticular lens on the card surface.
It is preferable that the line width of characters, designs, and the like in the character design transfer section is about 80 μm to 500 μm. Further, the size of the character / symbol transfer portion is not particularly limited, and can be appropriately set according to the size of the intended security card. Note that the number of character / symbol transfer portions on the plane portion may be one or plural.

(3) Metal substrate The metal substrate may have a single-layer structure or a laminated structure formed of a single metal, but preferably has a single-layer structure. This is because the cost can be reduced.

  The type of metal used for the metal substrate is not particularly limited as long as it can stably produce a security card by transfer, but stainless steel, iron, copper, aluminum, titanium, titanium alloy, nickel Metals such as nickel alloy, niobium, tantalum, zirconium, cobalt alloy, chromium alloy, molybdenum alloy, and tungsten alloy are preferable, and stainless steel is particularly preferable. This is because it is excellent in durability among metals, is easy to process such as etching, and is inexpensive.

The thickness of the metal substrate is not particularly limited as long as it can form a linear concave curved surface portion formed in the lenticular lens forming portion and can stably manufacture a security card by transfer. Although it is not a thing, it is preferable that it is a magnitude | size within the range of 0.05 mm-10 mm, for example.
The reason why it is preferable to set the thickness of the metal substrate within the above range is as follows.
As a method for producing a card master of the present invention, for example, when using a method of performing patterning by photolithography on the metal substrate and then performing etching, the metal substrate is exposed to ultraviolet rays or the like through a mask in the process. Will duplicate the pattern. At this time, it is necessary to obtain a stable pattern by vacuum-contacting the metal substrate and the mask. Therefore, the vacuum contact can be stably performed by setting the thickness of the metal substrate within the above range.
On the other hand, if the thickness of the metal substrate is smaller than the above range, the card master of the present invention is likely to be deformed during card production, and durability may be insufficient.
In addition, as a magnitude | size (area) of a metal substrate, it can set suitably according to the magnitude | size of a desired security card.
Further, the thickness of the metal substrate refers to the height from the bottom surface of the metal substrate to the plane portion, and specifically, is the distance indicated by h in FIG. 3 already described.

The surface of the metal substrate is preferably one having a smooth surface, and particularly preferably a glossy surface. This is because the surface of the card master can be transferred to make the surface of the security card glossy.
The ten-point average surface roughness (Rz) of the metal substrate is preferably in the range of Rz = 0.05 μm to 1.5 μm, and more preferably in the range of Rz = 0.1 μm to 0.5 μm. Is preferred.
The ten-point average surface roughness is a value measured using an optical interference type non-contact surface roughness meter. Specifically, it is obtained by using a Bartscan R3300H Lite manufactured by Ryoka System Co., Ltd. and measuring the profile range as +/- 5 microns.

2. Plating layer The plating layer in the present invention is formed so as to cover at least the lenticular lens forming portion of the metal substrate.
Here, to be formed so as to cover the lenticular lens forming portion of the metal substrate means that it is formed along the uneven shape formed in the lenticular lens forming portion of the metal substrate. The shape can be transferred to a security card substrate through a plating layer.

The plating layer is not particularly limited as long as it is formed so as to cover at least the lenticular lens forming portion of the metal substrate, but the lenticular lens forming portion of the metal substrate is formed. In the case of being formed on a part of the surface of the lenticular lens, it is preferable to cover the entire lenticular lens forming portion and to have a wider area in plan view than the lenticular lens. This is because the lenticular lens forming portion can be protected stably.
Further, when the metal substrate is formed so as to cover the lenticular lens and the flat portion, that is, when it is formed so as to cover the entire surface of the metal substrate on which the lenticular lens forming portion is formed, It is preferably formed so as to cover the entire surface of the metal substrate. This is because formation is easy.

Specifically, the thickness of such a plating layer can be in the range of 0.010 μm to 0.5 μm, and preferably in the range of 0.030 μm to 0.25 μm, In particular, the thickness is preferably in the range of 0.05 μm to 0.15 μm. This is because within the above range, a security card can be formed with high accuracy by a transfer method using the lenticular lens forming portion formed on the surface of the metal substrate and the concavo-convex shape of the flat portion.
In addition, even when the corners of the concavo-convex shape of the lenticular lens forming portion are rounded, that is, as shown in FIG. The surface of the corner C may be formed so that the plating layer 9 has a curvature. For this reason, it is possible to prevent catching and the like when releasing the security card after transfer, to have excellent releasability, and to prevent deformation due to concentration of stress. Because it becomes.
In addition, the said thickness refers to the thickness of the whole plating layer, and when a plating layer is a laminated structure so that it may mention later, it means the total thickness of the thickness of each layer.
In addition, about the code | symbol in FIG. 7, since it shows the same member as the thing of FIGS. 1-3, description here is abbreviate | omitted.

  The plating material constituting the plating layer is not particularly limited as long as it has hardness, corrosion resistance and the like that can reduce deformation of the lenticular lens forming portion, for example, Nickel, copper, platinum, cobalt, chromium, zinc, aluminum, lead, solder and the like can be mentioned, among which nickel is preferable. This is because when the plating material is the above-described material, the plating layer can have high hardness, and the deformation of the lenticular lens forming portion and the like can be reduced. Moreover, it is because it can be made excellent in corrosion resistance and durability.

The method for forming the plating layer is not particularly limited as long as the plating layer can be formed with a desired film thickness, but an electrolytic plating method or an electroless plating method may be used. When using an electroplating method, it has the advantage that a plating layer can be formed in a short time. On the other hand, when using an electroless plating method, the hardness of the transfer original plate for a flat security card obtained by the present invention is reduced. It has the advantage that it can be expensive.
In the present invention, it is particularly preferable to use an electroless plating method. High hardness, easy to reduce deformation of the lenticular lens forming part, etc., and easy to make the surface roughness small, and excellent releasability after transfer Because it is easy.
In addition, generally known methods can be used for the electrolytic plating method and the electroless plating method. For example, when the plating material is nickel, a method using a watt bath, a sulfamic acid bath, a wood bath (strike bath) or the like can be used as the electrolytic plating method.

When the plating layer is formed on a part of the surface of the metal substrate on which the lenticular lens forming portion is formed, a general plating layer patterning method is used as a method for forming the plating layer in a pattern. For example, after forming the resist which has an opening part in the location which forms a plating layer, the method of forming a plating layer can be mentioned.
Note that the resist material and the pattern forming method used for such a resist can be generally used when forming a plating layer in a pattern, and thus description thereof is omitted here.

Moreover, as a formation method of a plating layer, when forming a plating layer by the electroless-plating method, it is preferable to perform heat processing after that. This is because by performing the heat treatment, the hardness of the plating layer can be made higher and the deformation of the lenticular lens forming portion or the like can be made less.
Here, the temperature condition of the heat treatment is not particularly limited as long as the hardness of the plating layer can be increased by heating, and the material constituting the plating layer and the flat security card of the present invention are not limited. For example, when the material is nickel, it can be in the range of 200 ° C. to 600 ° C., and in particular, 300 ° C. to 500 ° C. It is preferable to be in the range of ° C, and it is particularly preferable to be in the range of 350 ° C to 450 ° C.
Moreover, as heat processing time, it can be in the range of 60 minutes-240 minutes, for example, It is preferable that it is in the range of 100 minutes-180 minutes especially. It is because it is easy to make a plating layer high hardness by being the said temperature and heat processing time.

The layer structure of the plating layer may be a single layer or may be a laminated structure in which two or more material layers are laminated.
In the present invention, in particular, a laminated structure in which an electroplating layer formed by an electroplating method on the surface of a metal substrate and an electroless plating layer formed by an electroless plating method on the electroplating layer are laminated in this order. It is preferable to have it. When the electrolytic plating layer is formed on the surface of the metal substrate as a base layer, a part of the oxide film on the surface of the metal substrate is reduced. For this reason, it is because a plating layer can be made excellent in thickness uniformity with a metal substrate.
As for the plating layer having such a two-layer structure, specifically, as shown in FIG. 8, an electrolytic plating layer (electrolytic nickel plating layer) 9a and an electroless plating layer (electroless nickel plating layer) 9b are provided. Those having a structure laminated in this order can be shown.
As the plating layer having a structure of three or more layers, specifically, as shown in FIG. 9, an electrolytic plating layer (electrolytic nickel plating layer) 9a, an electroless plating layer (electroless nickel plating layer) 9b, and The electroplating layer (electrolytic nickel plating layer) 9a can be shown as laminated in this order.
8 and 9 indicate the same members as those in FIGS. 1 to 3, and a description thereof will be omitted here.

When the plating layer has a laminated structure, the material of each layer can be the same as the plating material described above.
In the present invention, it is preferable that the plating material of each layer is the same. This is because the adhesion between the layers is excellent and the cost can be reduced.

The thickness of the electrolytic plating layer as the underlayer is not particularly limited as long as it can make the plating layer excellent in adhesion to the metal substrate, but is 0.01 μm to 0. It is preferably in the range of 25 μm, and in particular, it is preferably in the range of 0.03 μm to 0.2 μm, and particularly preferably in the range of 0.05 μm to 0.15 μm. This is because when the thickness is within the above range, the adhesion of the plating layer to the metal substrate can be effectively improved.
Moreover, as a formation method of the electroplating layer as a base layer, although the above-mentioned electroplating method can be used, it is preferable that it is the method of using a wood bath especially. This is because the adhesion is high and the plating time is short.

The hardness of the plating layer is not particularly limited as long as the deformation of the lenticular lens forming portion or the like can be reduced, but for example, as the Vickers hardness (Hv) of the surface of the plating layer, It can be in the range of 500 to 1000, and is preferably in the range of 600 to 900, particularly preferably in the range of 700 to 800. This is because it is possible to make the lenticular lens forming portion or the like less deformed by the above hardness.
In addition, as a measuring method of Vickers hardness, the method shown to JISZ2244 can be used.

3. Transfer Master Plate for Flat Security Card The card master plate of the present invention has the metal substrate and the plating layer, but may have other configurations as necessary.

B. Next, the manufacturing method of the transfer original plate for flat plate security cards of this invention is demonstrated.
The method for producing a transfer master for a flat security card according to the present invention includes a metal substrate preparation step of preparing a metal substrate having a flat surface portion and a lenticular lens forming portion on one surface, and the above-described metal substrate preparation step. A plating layer forming step of forming a plating layer so as to cover at least the lenticular lens forming portion of the metal substrate, and a plurality of the lenticular lens forming portions linearly arranged in parallel in a straight concave surface Part and a partition part formed between the said linear concave curved surface part which adjoins, It is characterized by the above-mentioned.

The manufacturing method of the transfer original plate for flat plate security cards of this invention is demonstrated using figures. FIG. 10 is a process diagram showing an example of a method for producing a flat plate for security card transfer master according to the present invention.
As shown in FIG. 10, first, a flat metal substrate 1a is prepared, a resist film 7a is formed on one surface of the metal substrate 1a (FIG. 10A), and a resist film is formed through a mask 8. By exposing and developing 7a (FIG. 10B), a patterned resist layer 7 is formed (FIG. 10C). At this time, in the resist layer 7, a plurality of openings 7b are linearly arranged in parallel with a pattern corresponding to the arrangement of linear concave curved surface portions.
Next, using the resist layer 7 as a mask, the metal substrate 1a is etched using an etchant to form the linear concave curved surface portion 4 and the partition wall portion 5 on the surface of the metal substrate 1, and then the resist layer 7 is formed. By peeling, the lenticular lens forming portion 3 having the linear concave curved surface portion 4 and the partition wall portion 5 is formed on the surface of the metal substrate 1 (FIGS. 10D and 10E).
Next, all the surfaces of the metal substrate 1 on which the flat surface portion 2 and the lenticular lens forming portion 3 side are formed are immersed in a plating tank, and plating is performed so as to cover the flat surface portion 2 of the metal substrate 1 and the lenticular lens forming portion 3. A flat-plate security card transfer master 10 on which the layer 9 is formed is obtained (FIG. 10F).
10A to 10E are metal substrate preparation steps, and FIG. 10F is a plating layer forming step.

  According to the present invention, a plated layer formed so as to cover at least the lenticular lens forming portion of the metal substrate can be easily obtained by the plated layer forming step.

The manufacturing method of the transcription | transfer original plate for flat plate security cards of this invention has a metal substrate preparation process and a plating layer formation process at least.
Hereafter, each process of the manufacturing method of the transcription | transfer original plate for flat plate security cards of this invention is demonstrated in detail.

1. Metal substrate preparatory process The metal substrate preparatory process in this invention is a process of preparing the metal substrate which has a plane part and a lenticular lens formation part on one surface.

  The method for forming the metal substrate in this step is not particularly limited as long as it can directly form the planar portion and the lenticular lens portion on one surface of the metal substrate. It is preferable that the resist layer be formed using, followed by etching.

Conventionally, MEMS, electroforming (EF), metal cutting, or the like is used as a method for producing a lenticular lens transfer master. These methods can produce large-format transfer masters of high-precision lenticular lenses, but they are not cheap and simple methods, and are suitable for the preparation of transfer masters for various types of small lots such as security cards. Absent.
Further, as a method different from the above-described method, a method of drawing directly with laser light (hereinafter sometimes referred to as a laser method) is used. When producing a transfer master using a laser method, it is more suitable for making a master for a variety of small lots than the above-mentioned method, but scattering of a molten substrate material or the like occurs in a laser light irradiated portion. Therefore, the smoothness of the surface of the transfer original plate may be impaired. Further, since the entire area of the transfer original plate is heated by the laser irradiation heat, the partition wall portion may be damaged or deformed.
For this reason, a security card produced with such a transfer master plate has irregularities and parts with different lens thickness on the surface of the lenticular lens, and when the image on the security card is viewed through the lenticular lens, the shape is unclear. May result in a low-visibility security card.

  On the other hand, the method of forming the resist layer by using photolithography as described above and then performing the etching is a method of forming the linear concave curved surface portion and the partition wall portion by directly etching the metal substrate. Therefore, it is possible to produce a transfer master easily and cheaper than the conventional method. In addition, unlike the laser method, etc., the surface smoothness is not impaired by the scattering of the melted material such as the substrate material, and the partition part is not deformed or damaged, so it is cheaper and easier than the laser method. The plane portion and the lenticular lens forming portion can be formed with high accuracy. Therefore, a security card having high visibility can be produced.

  As a method for forming a resist layer in this step, a resist material is applied on a metal substrate to form a resist film, and a patterned resist layer is formed so as to have an opening at a desired position. .

The resist material used in this step may be any material having photosensitivity, and may be a positive type or a negative type. Among them, it is preferable to use a liquid resist or a dry film resist, and it is particularly preferable to use a dry film resist. This is because it is a film-like resist whose film thickness is kept constant, the resolution can be expected to be stable, and the linear concave curved surface portion can be formed in a stable shape.
Examples of the material for the liquid resist and the dry film resist include those generally used in photolithography. When the resist material is in a liquid state, a general method such as a spin coating method, a blade coating method, or a dipping method can be used as a method for forming a resist film by applying the resist material on a metal substrate.

The thickness of the resist layer formed in this step is preferably in the range of 3 μm to 25 μm. When the thickness of the resist layer is larger than the above range, the etching solution does not sufficiently wrap around the resist layer pattern in the etching process described later, and a linear concave curved surface portion having a desired depth cannot be formed. Because there is.
Note that the thickness of the resist film before forming the patterned resist layer is the same as the thickness of the resist layer.

The resist layer is patterned so as to have an opening for forming a linear concave curved surface portion in etching.
About the width | variety of the said opening part, it can set suitably according to the shape of a linear concave curved surface part. Further, the parallel interval, the number, and the like of the openings can be appropriately selected according to the pitch width, the number, etc., of the linear concave curved surface portions formed in the etching process described later.

The resist layer pattern forming method in this step is not particularly limited as long as a desired pattern can be formed. For example, a photolithography method or a printing method can be used. Among them, it is preferable to use a photolithography method. This is because it can be formed with high pattern accuracy.
In addition, about the exposure conditions and development conditions in this process, the conditions in general photolithography can be used.

  The etching method for etching the metal substrate through the resist layer used in this step is not particularly limited as long as the planar portion and the lenticular lens forming portion can be accurately formed on one surface of the metal substrate. However, wet etching is preferred. This is because the processing efficiency is higher than that of dry etching, and it can be flexibly formed for various designs of linear concave curved surface portions and partition wall portions.

  As the wet etching method, an etching solution may be applied on a metal substrate having a resist layer, or a metal substrate having a resist layer may be immersed in the etching solution.

  The etchant used in this step is not particularly limited as long as it can etch the metal substrate, and is preferably selected as appropriate according to the metal material used. For example, when stainless steel is used for the metal substrate, it is preferable to use a cupric chloride solution, a ferric chloride solution, a hydrochloric acid-nitric acid-phosphoric acid mixed solution, or the like. The etching time can be appropriately adjusted according to the shape of the desired linear concave curved surface portion.

In addition, the material of the metal substrate and the thickness thereof in this step are the same as those described in the above-mentioned section “A. Transfer Master Plate for Flat Plate Security Card”, and therefore description thereof is omitted here.
Note that in this step, when polishing is performed after etching, the thickness of the metal substrate is preferably set in consideration of the thickness to be polished.

  The planar portion and the lenticular lens forming portion formed in this step are the same as the contents described in the above-mentioned section “A. Transfer Master Plate for Flat Plate Security Card”, and thus description thereof is omitted here.

In this step, it is preferable that a lenticular lens forming portion is formed and a character / symbol transfer portion is formed on the flat portion.
Conventionally, a laser method has been used to form the character / design transfer portion on a transfer original plate. However, in the case of the method described above, the shape of the character / symbol transfer portion is caused by the remaining irradiation traces of the portion irradiated with the laser beam or the scattering of the melt, or by heating the non-irradiated region by the laser beam irradiation. Has a problem that it is deformed and cannot be displayed clearly.
In the present invention, the character / symbol transfer portion is also formed by etching, so that it becomes possible to achieve a finer image without causing the above-mentioned problems. Moreover, when producing a security card, it can transfer, without impairing the shape of the said character design transfer part, and the quality of the transferred character etc. becomes favorable.
In addition, about the said character design transcription | transfer part formed in this process, since it is the same as that of the content as described in the term of the above-mentioned "A. transfer original plate for flat plate-shaped security cards", description here is abbreviate | omitted.

2. Plating layer forming step The plating layer forming step in the present invention is a step of forming a plating layer so as to cover at least the lenticular lens forming portion of the metal substrate prepared by the metal substrate preparation step.
In addition, about the formation method of the plating layer in this process and the plating layer formed by this process, since it can be made to be the same as the content as described in the above-mentioned section of “A. Transfer Master Plate for Flat Plate Security Card”, here But the explanation is omitted.

3. Other Steps The manufacturing method of the present invention has at least the metal substrate preparation step and the plating layer formation step, but may have other steps. For example, a processing step using an acid aqueous solution or an alkaline aqueous solution for leveling the surface of the metal substrate, a resist layer removing step for removing the resist layer after etching during the metal substrate preparation step, and a metal substrate after the metal substrate preparation step Examples thereof include a polishing step for polishing the surface.
Hereinafter, a polishing process is demonstrated among the processes mentioned above.

The polishing step in the present invention is a step of polishing the metal substrate from which the resist layer has been removed after the metal substrate preparation step described above. This is because by performing this step, a high curvature can be given to the top of the partition wall formed by the metal substrate preparation step.
In addition, this step is because the surface of the card original plate can be a glossy surface, and gloss can be imparted to the surface of the security card produced by transfer.
In addition, this process may be performed only on the surface of the top part of a partition part, and may be performed with respect to the whole metal substrate surface which has a lenticular lens formation part and a plane part.

  As a polishing method used in this step, for example, an electrolytic polishing method, a chemical polishing method, a composite polishing method in which electrolysis and chemical polishing are performed simultaneously, a buff polishing, or the like can be used. Among these, an electrolytic polishing method is preferably used. This is because the target protrusion in the card original plate can be selectively polished, and the surface can be smoothed and glossed.

  The polishing liquid used in the polishing method is preferably an acid-based polishing liquid, such as an aqueous solution of hydrochloric acid, sulfuric acid, nitric acid, an aqueous solution containing sulfuric acid and hydrogen peroxide, sodium persulfate, potassium persulfate, ammonium persulfate, or the like. Examples thereof include an aqueous solution containing a persulfate.

The rate at which the partition wall is polished in this step is preferably within a range of 5% to 50% with respect to the width of the top of the partition wall, and more preferably within a range of 5% to 25%. It is preferable that it is within a range of 5% to 10%.
It is because the surface of the card | curd original plate can be made into a glossy surface by making the ratio by which a partition part is grind | polished into the said range, and the top part of a partition part can be made into a curved surface.

  In this step, it is preferable that the top of the partition wall has a desired curvature by polishing the partition wall. The reason and the radius of curvature of the top of the partition wall are the same as those described in the above-mentioned section “A. Transfer Master Plate for Security Card”, and thus the description thereof is omitted here.

In this step, it is preferable to improve the smoothness of the surface by polishing the surface of the metal substrate, and it is preferable to have a smooth and glossy surface. This is because, by making the surface of the metal substrate a glossy surface, gloss can be imparted to the surface of the security card when transferring using the card original plate obtained by the present invention.
The ten-point average surface roughness (Rz) of the metal substrate after this step is the same as that described in the above-mentioned section “A. Transfer Master Plate for Security Card”. Furthermore, the glossy surface preferably has gloss when polished with # 400 or more abrasive grains.

  The curvature radius of the top of the partition wall polished by this process can be the same as the curvature radius described in the above-mentioned section “A. Transfer Master Plate for Flat Plate Security Card”. Omitted.

C. Security Card Manufacturing Method Next, a security card manufacturing method of the present invention will be described. In the method for producing a security card of the present invention, after laminating a sheet base material on one surface of the card base material, the pattern of the transfer original plate for a flat plate security card is transferred to the surface of the sheet base material, The card base material is irradiated with laser light from two different directions through the transfer process in which the sheet base material is a lenticular lens sheet having a sheet flat portion and a lenticular lens, and the lenticular lens formed by the transfer process. And a printing process for forming an image portion on the card base so as to overlap the lenticular lens in plan view, wherein the lenticular lens has a plurality of lines arranged in a straight line. And a lens-to-lens groove formed between the adjacent semi-cylindrical lenses. The plate-shaped security card transfer original plate used in the transfer step has a metal substrate having a flat portion and a lenticular lens forming portion on one surface, and at least the lenticular lens formation of the metal substrate A plating layer formed so as to cover the portion, and the lenticular lens forming portion includes a linear concave curved surface portion in which a plurality of linear lenticular lenses are arranged in parallel and an adjacent linear concave curved surface portion. And a partition wall formed between them.

A method for manufacturing such a security card will be described with reference to the drawings. FIG. 11 is a process diagram showing an example of a method for manufacturing a security card according to the present invention.
As illustrated in FIG. 11, first, a card base 12 and a sheet base 11a, which is a material layer of a lenticular lens sheet, are laminated in this order (FIG. 11 (a)), and the transfer original plate 10 for a flat security card is obtained. Is pressed against the sheet base material 11a and heated and pressurized to transfer the lenticular lens forming portion 3 and the flat surface portion 2 of the security card transfer original plate 10 onto the sheet base material 11a (FIG. 11B). As a result, the sheet base material is a lenticular lens 16 having a semi-cylindrical lens 13 in which a plurality of lines are arranged in parallel and an inter-lens groove 14 formed between the adjacent semi-cylindrical lenses, and the sheet. It is set as the lenticular lens sheet 11 which has the flat part 15 (FIG.11 (c)). At this time, the bottom width of the inter-lens groove portion 14 is determined according to the width of the top portion of the partition wall portion 5 of the flat plate for security card transfer master 10. In addition, in the case of having a character / design transfer portion (not shown) in which character information or the like is formed on the flat surface portion 2 of the flat security card transfer original plate 10, information such as characters and numbers in the character / design transfer portion is also provided. Since it is simultaneously transferred to the sheet substrate 11a, the sheet flat portion 15 of the lenticular lens sheet 11 to be formed has information on the character / symbol transfer portion.
Next, the light emitting material contained in the card base 12 is carbonized by irradiating the card base 12 with the laser beams Z1 and Z2 through the lenticular lens 16 (FIG. 11 (d)). Image portions 18a and 18b having information such as letters and numbers printed on the base material are formed (FIG. 11E).
The image portions 18a and 18b can be made to display different images depending on the observation angle by drawing different information. In addition, the plating layer included in the flat plate for security card transfer master 10 is omitted for ease of explanation.
Also, FIGS. 11A to 11C show the transfer process, and FIGS. 11D to 11E show the printing process.

According to the present invention, a lenticular lens is accurately formed at a desired position on a sheet base material in the transfer step by transferring using the flat plate security card transfer master having the above-described structure, and at the same time, high smoothness. The sheet flat part which has can be formed. This makes it possible to collectively form a lenticular lens sheet having a desired uneven shape.
In addition, since the thickness of the lenticular lens sheet can be made high by batch formation, the thickness of the entire card can be made uniform. Thereby, a security card with high dimensional accuracy can be produced with high productivity.
Furthermore, since a lenticular lens with high dimensional accuracy and placement accuracy is formed in the transfer process, when observing the image portion through the lenticular lens, different information on the image portion is clearly displayed according to the observation angle. Can do.
Thus, a security card with high dimensional accuracy and excellent visibility can be easily and inexpensively manufactured.
Furthermore, a security card can be stably obtained by using the plate-shaped security card transfer master having a plating layer.

The security card manufacturing method of the present invention includes at least a transfer process and a printing process.
Hereinafter, the manufacturing method of the security card of the present invention will be described for each process.

1. Transfer process In the transfer process of the present invention, the sheet base material is laminated on one surface of the card base material, and then the pattern of the transfer original plate for the flat plate security card is transferred to the surface of the sheet base material. In this step, the sheet base material is a lenticular lens sheet having a sheet flat portion and a lenticular lens. The lenticular lens includes a semi-cylindrical lens in which a plurality of lenses are arranged in parallel and an inter-lens groove formed between the adjacent semi-cylindrical lenses.

Here, the “pattern of the flat plate for security card transfer plate” means the flat surface of the flat plate for security card transfer plate and the concavo-convex shape of the lenticular lens forming portion, more specifically, formed on one surface of the metal substrate. In other words, the concavo-convex shape is formed by covering the flat portion, the lenticular lens forming portion, and at least the lenticular lens forming portion with a plating layer.
That is, by this step, a lenticular lens having the same shape as the inverted shape of the lenticular lens forming portion of the plate-shaped security card transfer original plate on the surface of the sheet base material, that is, a linear concave curved surface included in the lenticular lens forming portion. A semi-cylindrical lens and a lens-to-lens groove portion corresponding to the portion and the partition portion are formed, and a sheet flat portion having the same shape as the flat portion of the flat plate security card transfer master is formed. It is.

(1) Transfer Master for Flat Security Card The transfer master for flat security card used in this step has the same contents as those described in the section “A. Transfer Master for Flat Security Card” above. Explanation here is omitted.

(2) Sheet base material The sheet base material in the present invention refers to a flat and transparent resin layer before the irregular shape is formed in the lenticular lens sheet. That is, a lenticular lens sheet is formed by transferring the irregular shape on the surface of the card original to the sheet base material.
As a material for such a sheet base material, a material having flexibility capable of following the shape of the lenticular lens forming portion of the plate-shaped security card transfer master is preferably a material that is softened by heating, that is, a thermoplastic resin. preferable. Moreover, it is preferable to have transparency.
Such materials include polycarbonate, polyvinyl chloride, acrylic resin, polystyrene resin, polypropylene resin, polyethylene terephthalate, polyamide, polyimide, cellulose ester, fluorinated polymer, polyacetal, polyolefin, aramid, fluororesin, ABS (acrylonitrile butadiene -Styrene copolymer), PLA (polylactic acid), etc. can be used, and among these, it is preferable to use polycarbonate.

The thickness of the sheet base material is not particularly limited as long as it can form a desired lenticular lens shape and the like, but is preferably in the range of 30 μm to 150 μm, for example, 50 μm to 100 μm. It is preferable to be within the range. This is because if the thickness is larger than the above range, the thickness of the card defined by international standards may be exceeded. On the other hand, if the thickness is smaller than the above range, the strength of the card may not be obtained.
In addition, the thickness of a lenticular lens sheet means the length from the surface which contacts the card | curd base material mentioned later to the topmost part of a lenticular lens.

(3) Card Base Material Examples of the card base material used in the present invention include resin materials used as card base materials for general security cards. In addition, the material used for the said card | curd base material may have transparency, and may not have it.
Examples of such materials include polycarbonate, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyester, polymethyl methacrylate, polystyrene, aramid, polyimide, ABS (acrylonitrile / butadiene / styrene copolymer), PLA. (Polylactic acid) or the like can be used. Of these, polycarbonate is preferable.

The card base material preferably contains a coloring material. It is because the image part mentioned above can be formed in the surface of a card | curd base material by irradiating a laser beam by including a coloring material.
When using laser light as the method for forming the image portion, the color forming material may be any material that absorbs laser light, such as carbon black, titanium black, black iron oxide, mica, and the like. Of these, carbon black is preferred.

The thickness of the card base is preferably in the range of 50 μm to 800 μm, and more preferably in the range of 300 μm to 700 μm.
If the thickness of the card base is larger than the above range, it may exceed the thickness of the security card defined by international standards, while if it is smaller than the above range, the strength of the security card can be obtained. Because there may be no.

(4) Transfer process As a method for transferring the pattern of the plate precursor for security card to the surface of the sheet base material in this step, the sheet base material is a lenticular lens sheet having a lenticular lens and a sheet flat portion. In particular, thermal transfer is preferable, and transfer by heat and pressure is particularly preferable. This is because the sheet base material is softened by heating, and can be made to follow the uneven shape on the surface of the card original plate by pressurization, so that a lenticular lens sheet can be produced with high accuracy. Further, when the sheet base material and the card base material are laminated without being bonded, they can be bonded by heating and pressing.

As a transfer method by heat and pressure, a general method can be used and is not particularly limited. For example, it can be performed using a hot press machine or the like.
As a method using a hot press machine, first, an original card is installed on the upper plate of the hot press machine, and a sheet base material is installed on the lower plate of the hot press machine. Next, the card original plate is pressed against the sheet substrate while being heated and pressurized, and after holding for a desired time, the upper plate of the hot press machine is released. The card original plate is cooled on the sheet base material while being cooled, and then the card original plate is released to transfer the irregular shape on the surface of the card original plate onto the sheet base material. It can be a sheet.

The pressurizing condition in this step is not particularly limited as long as it is a pressure that can sufficiently transfer the uneven shape on the surface of the card original plate, and can be appropriately set according to the thickness of the sheet substrate.
In addition, the heating conditions in this step are not particularly limited as long as the temperature can sufficiently soften the sheet base material to such an extent that the uneven shape on the surface of the card original plate can be transferred. As heating temperature, about 200 degreeC is preferable, for example.
Furthermore, the heating time is appropriately set depending on the pressurizing condition and the heating condition, and is preferably about 20 minutes, for example.

Moreover, in this process, in order to harden the sheet | seat base material with which the uneven | corrugated shape of the card | curd original plate surface was transferred, a cooling process is performed after the transcription | transfer by heating pressurization. As a cooling method, a method of cooling the whole in a state where the original plate for card is pressed is preferable. For example, a method of cooling in an environment where heating and pressurization is performed, a method of cooling by applying cold air, or the like is used. it can.
The cooling time in this step is not particularly limited. In addition, when it cools rapidly for a short time, since the thermal contraction rate of a sheet | seat base material and the card | curd original plate differs, the obtained lenticular lens sheet may not become a desired shape, or the smoothness of a surface may be impaired.

2. Printing process The printing process in the present invention is that the card substrate is irradiated with laser light from two different directions through the lenticular lens formed by the transfer process described above, and overlaps the lenticular lens in plan view. Thus, an image part is formed in the said card | curd base material.

The type of laser light used in this step is not particularly limited as long as it can be absorbed by the coloring material. For example, an infrared ray having a wavelength of 700 nm to 1300 nm, such as a gas laser, a YAG laser, a semiconductor laser, a fiber laser, or a surface emitting laser. The light source which emits can be mentioned.
The conditions such as the irradiation angle and irradiation time of the laser light are not particularly limited as long as a desired image portion can be printed.

  The image portion formed by this process has information such as characters, symbols, and patterns. The image portion is arranged so as to overlap the lenticular lens described above in plan view. Therefore, the size of the image portion is preferably a size that does not exceed the area covered by the lenticular lens. In addition, the image portion located below the lenticular lens is generally configured with two different image portions, but may have two or more image portions.

3. Security card A security card produced according to the present invention has a card substrate having an image portion and a lenticular lens sheet disposed on one surface of the card substrate, and the lenticular lens sheet has The flat plate portion and the lenticular lens corresponding to the flat portion and the lenticular lens forming portion of the flat plate for security card are provided.
Further, the lenticular lens and the image portion are arranged so as to overlap in a plan view, and the image portion visually recognized is different depending on the observation angle.

  The security card obtained by the present invention has a lenticular lens sheet on the surface of which a lenticular lens and a flat sheet portion are formed. The lenticular lens is adjacent to a semi-cylindrical lens in which a plurality of lenses are arranged in parallel. And an inter-lens groove formed between the matching semi-cylindrical lenses. Therefore, when observing the image portion of the card substrate through the lenticular lens, the image that appears depending on the observation angle can be made different.

  The size and thickness of the security card of the present invention can be set as appropriate according to the application. However, since the size of the security card is defined by an international standard (for example, ISO7816), it is determined by the international standard. It is necessary to be within the range of the dimensions to be achieved.

  The use of the security card obtained by the present invention can be used in fields where visibility and anti-counterfeiting are required, for example, personal information management cards such as credit cards, information that requires confidentiality such as government documents, etc. It can be used as a medium.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  The present invention will be described more specifically with reference to the following examples.

[Example 1]
(Preparation of transfer master plate for security card)
<Metal substrate preparation process>
(1) Resist layer forming step As a metal substrate used for the card original plate, a SUS304 material, which is a rolled material having a plate thickness of 0.5 mm and a 300 mm square, was prepared. One surface of the metal substrate is adjusted by alkaline degreasing (NaOH aqueous solution 5%, 60 ° C.), sulfuric acid electrolysis (sulfuric acid aqueous solution 5%, normal temperature, current density dk = 3), and hydrochloric acid dip (hydrochloric acid aqueous solution 10%, normal temperature). Surface treatment was performed.
Next, a dry film resist was laminated on the surface of the metal substrate that had been subjected to the leveling treatment to form a photoresist layer having a thickness of about 15 μm.
Next, using a parallel light exposure machine, pattern exposure was performed by ultraviolet irradiation through a mask, followed by development with hot water at 40 ° C. to form a photoresist layer pattern.
About the mask, in order to form a lenticular lens within the size of the above-mentioned metal substrate, it has a design having an outer shape of about 85 mm × 50 mm per card, and the vertical and horizontal in the card A rectangular lenticular lens forming portion having a size of about 20 mm was provided so that the lenticular lens could be arranged in the lower left part of the obtained security card. The area other than the lenticular lens forming part was a flat part.

(2) Etching Step After patterning the photoresist layer on the patterning surface, etching was performed to obtain the shape of the lenticular lens forming portion having the linear concave curved surface portion and the partition wall portion and the planar portion.

<Verification>
Since the design of the lenticular lens forming portion using the mask depends on the resolution and etching conditions of the resist layer coated as described above, the lens shape is not determined only by the mask pattern. For this reason, the pattern shape of the mask and the etching conditions were verified with the finally obtained shape after etching.
As the shape after etching, processing is performed assuming that the width of the top of the partition wall, the width, depth, pitch width and curvature radius of the bottom of the linear concave curved surface can be mainly controlled as the processing shape. did.
As a result of the verification, a shape that was changed stepwise every 5 μm was obtained for a range of 5 μm to 20 μm in width at the top of the partition wall.
Moreover, about the shape of the other linear recessed curved surface part, the shape which changed in steps every 10 micrometers according to etching conditions, such as immersion time and spray injection pressure, was obtained.

<Polishing process>
For a plurality of metal substrates that have undergone the above-described steps, in order to form a curvature at the top of the partition wall, the metal substrate is dipped in a 5% nitric acid aqueous solution under various conditions such as processing time, and pickled, and then buffed. The glossy surface was treated with # 400. Thereby, the curvature of the top of the partition wall could be changed in steps of 1 μm to 2 μm with respect to 2.5 μm to 10 μm.

<Plating layer formation process>
After the polishing step, an electrolytic wood nickel layer having a thickness of 0.15 μm was formed using an electrolytic wood nickel bath so as to cover the lenticular lens forming portion and the flat portion of the metal substrate.
Next, an electroless nickel layer having a thickness of 0.25 μm was formed using an electroless nickel bath so as to cover the electrolytic wood nickel layer.
Thereafter, the metal substrate on which the plating layer was formed was placed in a heat treatment furnace and heat treated at 400 ° C. for 150 minutes.
Through the series of steps described above, a plurality of card masters of the present invention were obtained.

[Example 2]
(Preparation of security card)
<Transfer process>
A laminate of a card base material (thickness 50 μm to 100 μm) containing carbon black and a sheet base material (thickness 50 μm to 100 μm) mainly composed of polycarbonate as a lenticular lens sheet was prepared in advance.
The card precursor obtained in Example 1 was mounted on a flat press, and the laminate was pressed at 200 ° C. for 20 minutes at 1 kg / cm ² , then cooled for about 30 minutes, The temperature was lowered to a temperature at which the material hardened.
After cooling, the flat pressing machine was opened, and the original card was released from the sheet base material. By this implementation, the concave / convex shape on the surface of the card original plate is transferred onto the above-mentioned sheet base material, and has a sheet flat portion and a lenticular lens, and the lenticular lens is a semi-cylindrical lens in which a plurality are arranged in parallel And a lenticular lens sheet having an inter-lens groove.

<Printing process>
Subsequently, on the lenticular lens sheet, YAG laser irradiation was performed on the semi-cylindrical lens constituting the lenticular lens, and the image portion was printed. With this implementation, it was possible to form an image part on the card substrate, and it was possible to produce an intended security card having a different visual image of the image part depending on the observation angle.

[Comparative Example 1]
A card original plate was obtained in the same manner as in Example 1 except that the plating layer forming step was not passed.

<Evaluation>
Using the card original plate obtained in Example 1 and Comparative Example 1, the transfer process of Example 2 above, that is, the process of repeatedly forming and peeling the lenticular lens sheet, is formed on the metal substrate. In addition, it was verified whether or not the top of the partition wall was damaged.
As a result, the card original plate of Comparative Example 1 was deformed on the surface of the 5 μm and 10 μm widths at the top of the partition wall of the card original plate by repeatedly forming and peeling the lenticular lens sheet 100 times. It was.
On the other hand, in the card original plate of Example 1, the above lenticular lens sheet formation and peeling were repeated up to a total of 225 times, but could be used continuously without damage or deformation.

DESCRIPTION OF SYMBOLS 1 ... Metal substrate 2 ... Plane part 3 ... Lenticular lens formation part 4 ... Linear concave curved surface part 5 ... Partition part 9 ... Plating layer 10 ... Transfer master for flat plate security card 11 ... Lenticular lens sheet 12 ... Card base material 13 ... Semi-cylindrical lens 14 ... Inter-lens groove 15 ... Sheet flat part 16 ... Lenticular lens 20 ... Security card

Claims (4)

A metal substrate having a planar portion and a lenticular lens forming portion on one surface;
A plating layer formed so as to cover at least the lenticular lens forming portion of the metal substrate;
Have
The lenticular lens forming portion has a straight concave surface portion in which a plurality of linear lenticular lenses are arranged in parallel and a partition wall portion formed between the adjacent linear concave surface portions. A transfer master for flat security cards.   2. The flat security card transfer according to claim 1, wherein the plating layer has a laminated structure in which an electrolytic plating layer and an electroless plating layer are laminated in this order on the surface of the metal substrate. Original edition. A metal substrate preparation step of preparing a metal substrate having a planar portion and a lenticular lens forming portion on one surface;
A plating layer forming step of forming a plating layer so as to cover at least the lenticular lens forming portion of the metal substrate prepared by the metal substrate preparation step;
Have
The lenticular lens forming portion has a linear concave curved surface portion in which a plurality of linear lenticular lenses are arranged in parallel and a partition wall portion formed between the adjacent linear concave curved surface portions. Of manufacturing a transfer master for a security card. After laminating the sheet substrate on one surface of the card substrate,
Transferring the pattern of the plate-shaped security card transfer original plate onto the surface of the sheet base material, and transferring the sheet base material to a lenticular lens sheet having a sheet flat portion and a lenticular lens,
The card base is irradiated with laser light from two different directions through the lenticular lens formed by the transfer step, and an image portion is formed on the card base so as to overlap the lenticular lens in plan view. A printing process to
A security card manufacturing method comprising:
The lenticular lens has a semi-cylindrical lens in which a plurality of linear lenses are arranged in parallel, and an inter-lens groove formed between the adjacent semi-cylindrical lenses,
The plate-shaped security card transfer master used in the transfer step has a metal substrate having a flat surface portion and a lenticular lens forming portion on one surface;
A plating layer formed so as to cover at least the lenticular lens forming portion of the metal substrate;
Have
The lenticular lens forming portion has a straight concave surface portion in which a plurality of linear lenticular lenses are arranged in parallel and a partition wall portion formed between the adjacent linear concave surface portions. A security card manufacturing method.

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