JP2015063035A - Transfer original plate for security card and method for manufacturing security card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer original plate for a security card which makes it possible to easily manufacture a security card having excellent visibility and to shorten a manufacturing time for the security card, and a method for manufacturing the security card by use of the transfer original plate for the security card.SOLUTION: A transfer original plate for a security card including a metal substrate having a plane part and a lenticular lens formation part on one surface, and an open hole which penetrates from said one surface to the opposite surface of the metal substrate. The lenticular lens formation part has plural semi-circular column-shaped lens transfer parts disposed in a stripe-like pattern, and partition wall parts provided between adjacent semi-circular column-shaped lens transfer parts.

Description

  The present invention relates to a security card transfer original plate and the like that can easily manufacture a security card with excellent visibility and can reduce the manufacturing time of the security card.

  A so-called personal identification function that confirms the identity of the card holder and the card user in a security card such as an ID card, various membership cards, or a credit card (hereinafter sometimes abbreviated as “card”). In general, an image such as an image of an owner's personal information or a photograph is displayed on the card surface. 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. The lenticular lens has a shape in which a plurality of linear lenses (hereinafter referred to as “semi-cylindrical lenses”) having a convex lens shape in cross section and a substantially semi-cylindrical side surface are arranged in parallel and at equal intervals. It has a condensing function of the lens only in the direction having a convex lens-shaped cross section. In a security card, by providing a lenticular lens on an image such as personal information to be displayed, when observing the card through a lenticular lens from a specific observation angle, the image portion of the card substrate has an observation angle. Since the image displayed according to this can be selected and visually recognized, it can be set as a highly visible card (refer patent documents 1-3).

  When manufacturing a security card as described above in a small variety of small lots, for example, a method of providing a lenticular lens on the card surface by attaching only a lenticular lens after separately forming it with a mold roll is used. ing. However, there has been no known method for manufacturing a transfer master capable of manufacturing a security card with a lenticular lens at low cost, simply and accurately.

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 easily manufacture a security card having excellent visibility and can shorten the manufacturing time of the security card (hereinafter referred to as a security card transfer master plate). , And may be abbreviated as “card original plate”), and a security card manufacturing method using the card original plate.

  In order to achieve the above object, the present invention has a metal substrate having a flat surface portion and a lenticular lens forming portion on one surface, and a through hole penetrating from the one surface of the metal substrate to the opposite surface. The lenticular lens forming portion has a plurality of semi-cylindrical lens transfer portions arranged in a stripe shape and a partition wall portion provided between the adjacent semi-cylindrical lens transfer portions. Providing an original card.

According to the present invention, by having the through hole, when the thermal transfer is performed using the card original plate of the present invention, the card surface is in contact with the outside air in the through hole, so that heat is easily radiated. Thereby, the cooling rate of the whole card | curd after transcription | transfer can be accelerated, and the manufacturing time of a card | curd can be shortened.
Moreover, since it can deaerate from the said through-hole, while reducing the air resistance produced when pressing the card | curd original plate of this invention against a card | curd, the surface shape of a security card is impaired by an air pool, etc. Occurrence can be prevented.
Furthermore, since the card has a region not in contact with the card master of the present invention due to the through hole, it is possible to improve the releasability of the card after transfer.
Furthermore, not only can the lenticular lens etc. be accurately formed at the desired position on the card surface, but the flat part of the card can be smoothed and the thickness of the entire card can be made uniform. Can be manufactured. As a result, information such as characters, symbols, and symbols can be printed at an accurate position inside the card via the lenticular lens, and the card can clearly display different images depending on the observation angle.
In this way, it is possible to obtain a card original plate that can be manufactured easily and in a short time with a highly visible security card.

  In the said invention, it is preferable that the opening width in the said one surface side of the said through-hole is larger than the opening width in the said other surface. This is because by having the above structure, the through hole has a tapered shape, and therefore, when the card is produced using the card original plate of the present invention, the release property of the card can be further improved.

  In the said invention, it is preferable that the said through-hole is arrange | positioned in the area | region transferred on the surface of a security card. This is because when the card is manufactured using the card original plate of the present invention, the reverse shape of the through hole is formed on the surface of the card, and the reverse shape can be used as a pattern or a character.

  In the said invention, it is preferable that the said through-hole is arrange | positioned outside the area | region transferred on the surface of a security card. This is because when the card is produced using the card original plate of the present invention, since the inverted shape of the through hole is not formed on the card surface, the number of protrusions on the card surface can be minimized.

  The present invention further includes a metal substrate having a flat surface portion and a lenticular lens forming portion on one surface, and a through hole penetrating from the one surface of the metal substrate to the opposite surface, and the lenticular lens forming portion. Using a card original plate having a plurality of semi-cylindrical lens transfer portions arranged in stripes and a partition wall portion provided between the adjacent semi-cylindrical lens transfer portions. The one surface of the card original plate is pressed against the sheet base material laminated on the surface of the sheet, the sheet flat portion, a plurality of semi-cylindrical lenses arranged in a stripe shape, and the adjacent semi-cylindrical lenses A lenticular lens having an inter-lens groove formed between, a transfer step for forming a lenticular lens sheet having at least, and the car And a printing step of irradiating the base material with laser light from at least two different directions to form an image portion on the card base material so as to overlap the semi-cylindrical lens in plan view. A method for manufacturing a card is provided.

According to the present invention, the card master is provided with a through hole, and when the entire card is cooled after the transfer, the sheet base material directly touches the outside air in the through hole, so that the heat of the sheet base material is easily radiated. . Thereby, the cooling rate of the whole card can be increased, and the cooling time can be shortened.
In addition, since part of the air received when the card master is pressed onto the sheet base material can be degassed from the through hole, air resistance applied during transfer can be reduced. As a result, it is possible to prevent the resulting lenticular lens sheet from having a shape defect due to air accumulation.
Further, since the card base has a through-hole, the sheet base has a region that is not in contact with the card master, so that the sheet base can be easily released after cooling.
Furthermore, by using a card master having the above-described structure, a security card having a uniform card thickness, a lenticular lens having high dimensional accuracy and placement accuracy, and a sheet flat portion having high smoothness is provided. Can be manufactured in batch. Thereby, in a printing process, it can print correctly in the position which overlaps with a semi-cylindrical lens on planar view, and the information of the image part visually recognized via a lenticular lens can be displayed clearly.
Thus, a security card with high dimensional accuracy and excellent visibility can be manufactured easily and in a short time.

  In the present invention, there is provided a card original plate capable of easily manufacturing a security card having excellent visibility and capable of reducing the manufacturing time of the card, and a method of manufacturing a security card using the card original plate. There is an effect that it can be provided.

It is a schematic plan view which shows an example of the transfer original plate for 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 an example of the lenticular lens formation part in the XX cross section of FIG. It is a schematic sectional drawing for demonstrating the shape of the partition part in the XX line cross section of FIG. It is a schematic plan view for demonstrating the imposition aspect of the transcription | transfer original plate for security cards of this invention. It is process drawing which shows an example of the manufacturing method of the security card of this invention. It is a schematic plan view which shows an example of the security card obtained by 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 security card obtained by this invention. It is explanatory drawing which shows the relationship between the observation angle and the image part visually recognized in the security card obtained by this invention.

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

A. Transfer master for security cards (original for cards)
First, the card master of the present invention will be described. The card original plate of the present invention has a metal substrate having a flat surface portion and a lenticular lens forming portion on one surface, and a through-hole penetrating from the one surface of the metal substrate to the opposite surface, and the lenticular lens The forming portion includes a plurality of semi-cylindrical lens transfer portions arranged in a stripe shape, and a partition wall portion provided between the adjacent semi-cylindrical lens transfer portions.

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. In FIG. 1, the X direction is the short direction and the Y direction is the long direction.
As shown in FIG. 1 and FIG. 2, a card original plate 10 of the present invention includes a metal substrate 1 having a lenticular lens forming portion 3 and a flat portion 6 formed on one surface, and one surface of the metal substrate 1. It has a through hole 2 penetrating to the opposite surface. The lenticular lens forming unit 3 includes a plurality of semi-cylindrical lens transfer units 4 arranged in a stripe shape and a partition wall unit 5 provided between adjacent semi-cylindrical lens transfer units 4. . The plurality of semi-cylindrical lens transfer portions 4 are arranged in parallel at equal intervals.

According to the present invention, by having the through hole penetrating the metal substrate, when performing the thermal transfer using the card original plate of the present invention, the card surface is in contact with the outside air in the through hole, so that heat is easily radiated. For this reason, the cooling rate of the whole card | curd after transcription | transfer can be accelerated, and the manufacturing time of a card | curd can be shortened.
Moreover, since it can deaerate from the said through-hole, while reducing the air resistance produced when pressing the card | curd original plate of this invention against a card | curd, the surface shape of a security card | curd is impaired by an air pool etc. Can be prevented.
Furthermore, it becomes possible to improve the mold release property of the card after transfer by having the through hole. In order to impart gloss to the surface of the security card, a card master having gloss on the surface may be used, but there is a problem that the card is difficult to peel off after transfer. This is presumed to be due to the large contact area between the surface of the card original plate and the card surface. In the present invention, since the portion of the through hole is not in contact with the card surface and the contact area is reduced, the card can be easily peeled after the transfer even if the surface of the card original has gloss. . Thereby, the improvement of the mold release property of a card | curd can be made glossy on the surface of the card | curd obtained.
Thus, the card master of the present invention makes it possible to manufacture a security card easily and in a short time.

In addition, according to the present invention, since the card master has the above-described structure, security cards having high dimensional accuracy can be collectively formed. That is, by using the card master of the present invention, the shape of the lenticular lens can be accurately formed at a desired position on the card surface, and the flat portion of the card can be smoothed. Further, since the thickness of the entire card can be made uniform, the card can have high dimensional accuracy.
Even when printing information such as letters, symbols, designs, etc. on the card via the semi-cylindrical lens constituting the lenticular lens, the lenticular lens is accurately formed at a desired position, so that the accurate position Can be printed. For this reason, a card can make a different image appear clearly through a lenticular lens according to an observation angle.
In this way, the card master of the present invention makes it possible to easily and inexpensively manufacture a security card with high dimensional accuracy and excellent visibility.

  Hereinafter, the configuration of the card original plate of the present invention will be described.

1. Metal substrate The metal substrate in the present invention has a flat portion and a lenticular lens forming portion on one surface, and has a through hole penetrating from the one surface to the opposite surface.

The metal substrate is preferably a single layer structure formed of a single metal. In the case of a multi-layer structure in which plating is applied on the surface of the metal substrate, stress tends to be concentrated on the semi-cylindrical lens transfer portion during transfer, and the plating on the lenticular lens forming portion peels off from the metal substrate. Because there are cases.
The type of metal used for the metal substrate is not particularly limited, but stainless steel, iron, copper, aluminum, titanium, titanium alloy, nickel, nickel alloy, niobium, tantalum, zirconium, cobalt alloy, chromium alloy , Molybdenum alloy, tungsten alloy and the like 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 preferably a size within a range of 0.05 mm to 5 mm including the thickness of the card original. The reason is as follows.
As a manufacturing method of the card original plate of the present invention, for example, when using a method of performing patterning by photolithography on a metal substrate and then performing an etching process, the metal substrate is exposed to ultraviolet rays or the like through a mask in the process. Duplicate the pattern. At this time, it is necessary to obtain stable patterning by performing vacuum contact between the metal substrate and the mask. Therefore, by making the thickness of the metal substrate within the above range, it is possible to stably perform vacuum adhesion. 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 the manufacture of the card, and the 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.

2. Through-hole The through-hole in the present invention penetrates from one surface having the flat portion of the metal substrate and the lenticular lens forming portion to the opposite surface.

The planar shape of the through hole is not particularly limited as long as it has a desired area. For example, it can be a polygonal shape such as a circular shape, a semicircular shape, an elliptical shape, or a rectangular shape. Moreover, you may have shapes, such as a character and a pattern.
The planar shape of the through hole means at least the planar shape of an opening (hereinafter sometimes referred to as a lower opening) on the surface opposite to the surface having the lenticular lens forming portion of the metal substrate. Further, the planar shape of the opening (hereinafter sometimes referred to as the upper opening) on the surface of the metal substrate having the lenticular lens forming portion or the like may be the same as or different from the planar shape of the lower opening. May be. The lower opening in the through hole is a portion indicated by P in FIG.

  The cross-sectional shape of the through-hole as viewed from the cross-section along the line XX in FIG. 1 is not particularly limited, and can be appropriately designed according to the formation method of the through-hole. There may be. Further, as shown in FIG. 2, a part of the side surface of the through hole 2 may have a curved shape, or may have a step on the side surface.

  As for the width of the through hole, it is preferable that the heat dissipation effect and the air venting effect are sufficiently obtained when the security card is manufactured, and the card is easily detachable. It is preferable that the size is sufficient to allow sufficient contact. Specifically, the width is preferably about 70 μm to 8000 μm. Note that the width of the through hole is a portion indicated by w in FIG. 2, and is the width of the longest portion of the lower opening, or the diameter when the shape of the lower opening is circular.

Further, the through hole preferably has an opening width on the surface side having the flat portion of the metal substrate and the lenticular lens forming portion, that is, the width of the upper opening is larger than the opening width on the opposite surface, that is, the width of the lower opening. . By having the above structure, the through-hole has a tapered shape, and therefore, when a security card is manufactured using the card original plate of the present invention, it becomes possible to further improve the releasability of the card. .
Specifically, the ratio of the width of the upper opening to the width of the lower opening in the through hole is preferably in the range of the width of the upper opening: the width of the lower opening = 1: 1 to 8: 1. : It is preferable that it exists in the range of 1-6: 1. In addition, the width | variety of an upper opening means the width | variety or diameter of the longest part of an upper opening.

The width of the through-hole 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 Systems Co., Ltd., Wyko NT9000 series manufactured by Veeco). Specifically, the through hole of the card original plate of the present invention is placed on the measurement stage of the optical interference type surface shape measuring device facing the measuring head, and the surface shape data of the through hole is a set of three-dimensional coordinate data. In a non-contact manner and can be calculated based on the surface shape data.
In addition, as long as there is no special description also about the dimension of each site | part in the following description, each structure shall be mounted toward the measurement head and shall be measured using the above-mentioned method.

Moreover, it is preferable that a through-hole occupies a desired ratio with respect to one surface of a metal substrate. The area occupation ratio of the through-hole when the area of one surface of the metal substrate is 100% is in the range of 1% to 10%, particularly in the range of 1% to 8%, particularly in the range of 1% to 5%. It is preferable to be within.
If the area occupancy ratio of the through-hole with respect to one surface of the metal substrate does not satisfy the above range, when the card is manufactured using the card original plate of the present invention, the card surface cannot sufficiently contact the outside air, In some cases, the cooling rate cannot be improved, the air can not be sufficiently removed, and the releasability is not improved. On the other hand, when the area occupation ratio of the through holes is equal to or more than the above range, the effective area of the flat portion of the obtained card may be reduced.
The area of the through hole refers to the area of the opening (lower opening) on the surface opposite to the surface having the lenticular lens forming portion of the metal substrate, and when there are a plurality of through holes, it refers to the total area of the lower opening.

  The number of through holes may be one or may be plural. By having a plurality, the contact area between the card surface and the outside air is increased when the card is manufactured using the card original plate of the present invention, so that the cooling rate of the entire card can be increased. Further, since the number of places where air can be removed increases, the air resistance when pressing the card master can be reduced. Furthermore, since the contact area between the card surface and the card master is reduced, the card can be easily released.

  Further, as shown in FIGS. 1 and 2, the position of the center point (or centroid point) of the upper opening may coincide with the position of the center point (or centroid point) of the lower opening in plan view. You don't have to.

The formation position of the through hole is not particularly limited as long as it does not overlap with the lenticular lens formation portion.
Moreover, about arrangement | positioning of a through-hole, it can set suitably by the imposition aspect etc. of the original plate for cards of this invention. Specifically, since it will be described in the section of “5. Security card transfer original plate” described later, description thereof is omitted here.

3. Lenticular lens forming part The lenticular lens forming part in the present invention is provided on one surface of a metal substrate, and a plurality of semi-cylindrical lens transfer parts arranged in stripes and the adjacent semi-cylindrical lens transfer part. And a partition wall provided therebetween.

FIG. 3 is a schematic cross-sectional view showing an example of a lenticular lens forming section in the cross section taken along the line XX of FIG. 1, and the reference numerals in the figure are the same as those in FIGS. To do.
The lenticular lens forming part is formed by molding the surface of a metal substrate into the shape of a semi-cylindrical lens transfer part and a partition part.
Hereinafter, each part of the lenticular lens unit will be described.

(1) Semi-cylindrical lens transfer portion The semi-cylindrical lens transfer portion is arranged in a stripe shape on one surface of the metal substrate. The semi-cylindrical lens transfer portion is a portion that transfers and forms a semi-cylindrical lens when a security card is manufactured using the original card for the present invention.

  The width of the semi-cylindrical lens transfer portion is preferably within a range of 20 μm to 200 μm, more preferably within a range of 40 μm to 120 μm, and particularly preferably within a range of 50 μm to 70 μm. If the width of the semi-cylindrical lens transfer portion is larger than the above range, for example, when the card original plate of the present invention is formed by etching, the height of the semi-cylindrical lens transfer portion becomes relatively large. The thickness of the semi-cylindrical lens transferred and formed by the original plate for printing is also increased. For this reason, the card thickness obtained may exceed the range prescribed by the standard. On the other hand, if the thickness is smaller than the above range, the stability of the resolution cannot be ensured during patterning by photolithography, and there is a possibility that the variation of the shape becomes large. For this reason, the shape of the semi-cylindrical lens to be transferred varies, and the desired optical performance may not be obtained.

  The width of the semi-cylindrical lens transfer portion refers to the length in the short direction, and refers to the portion indicated by X1 in FIG. In addition, if the semi-cylindrical lens transfer part and the partition part are continuous and the position where the semi-cylindrical lens transfer part is separated is not clear, the semi-cylindrical lens transfer part in the graph created by the non-contact method measurement And the inflection point of the curved surface formed by the partition wall, and the length in the short direction at the inflection point is defined as the width of the semi-cylindrical lens transfer portion. That is, the inflection point is a position where the sign of the curvature of the curve formed by the cross section in the short direction of the semicylindrical lens transfer portion and the partition wall changes on the target curved surface. Here, as one method of calculating the curvature from the curve formed by the cross section in the short direction, the above curve is divided into minute sections, and the least square method is applied to the measurement data constituting the curve in the minute section for calculating the curvature. And a method of obtaining a curvature from the radius of the obtained arc is used.

The semi-cylindrical lens transfer portion preferably has a small pitch width, for example, 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 semi-cylindrical lens transfer portion is larger than the above range, the arrangement interval of the semi-cylindrical lens transfer portion is increased, and thus the arrangement interval of the semi-cylindrical lenses transferred and formed on the card surface is also increased. For this reason, each semi-cylindrical lens becomes visually noticeable in the lenticular lens on the card, which may be undesirable in appearance. On the other hand, if it is smaller than the above range, the width of the semi-cylindrical lens transfer portion is also reduced, and the lens shape may be lost when the lenticular lens is transferred and formed.
The pitch width of the semi-cylindrical lens transfer portion refers to the distance between the centers of the adjacent semi-cylindrical lens transfer portions, and refers to the portion indicated by X2 in FIG.

The semi-cylindrical lens transfer portion preferably has a desired curvature at the bottom. The radius of curvature of the bottom of the semi-cylindrical lens transfer portion (hereinafter sometimes abbreviated as “the radius of curvature of the semi-cylindrical lens transfer portion”) is preferably in the range of 10 μm to 100 μm, It is preferably within a range of 30 μm to 90 μm, and particularly preferably within a range of 50 μm to 80 μm.
If the radius of curvature of the semi-cylindrical lens transfer part is smaller than the above range, the radius of curvature of the semi-cylindrical lens to be transferred is also small, so printing by laser irradiation etc. through the semi-cylindrical lens at the time of card manufacture In the case of performing printing, there is a possibility that printing cannot be performed because the transmitted laser beam has a focus before reaching a desired position on the card. On the other hand, if the radius of curvature of the semi-cylindrical lens transfer portion is larger than the above range, the radius of curvature of the semi-cylindrical lens to be transferred is also large. The laser beam that has passed through the lens has a focal point beyond the desired position on the card, which may prevent printing.
The radius of curvature of the bottom of the semi-cylindrical lens transfer portion refers to a portion indicated by R1 in FIG.

The depth of the semi-cylindrical lens transfer 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. .
If the depth of the semi-cylindrical lens transfer part is larger than the above range, the thickness of the formed lenticular lens will also increase when the security card is manufactured, which may exceed the standard card thickness. There is. When printing on a card by laser irradiation, the laser beam that has passed through the semi-cylindrical lens has a focal point before reaching a desired position, and printing may not be performed. On the other hand, if it is smaller than the above range, the lenticular lens to be transferred and formed may not have a desired thickness, and the function as a lens for switching display of image information may not be sufficiently exhibited. Further, when printing is performed by the above-described method, the laser light transmitted through the semi-cylindrical lens has a focal point beyond a desired position, and printing may not be performed.
The depth of the semi-cylindrical lens transfer portion refers to the length from the lowermost portion of the semi-cylindrical lens transfer portion to the uppermost portion of the partition wall portion, which is a portion indicated by T2 in FIG.

  The number of semi-cylindrical lens transfer portions can be appropriately selected. Further, the length in the longitudinal direction of the semi-cylindrical lens transfer portion is not particularly limited, and is appropriately selected according to the size of the metal substrate and the size of the lenticular lens.

(2) Partition Wall The partition wall is provided between adjacent semi-cylindrical lens transfer sections. The number is determined according to the number of semi-cylindrical lens transfer portions.

  The shape of the partition wall is not particularly limited as long as it has a desired width, height, and the like. As shown in FIG. 4A, the cross-sectional shape of the partition wall is usually a shape in which the side surface of the partition wall forms a right angle, but forms an obtuse angle as shown in FIGS. 4B and 4C. The shape (taper shape) may be sufficient. The angle formed by both side surfaces of the partition wall (θ in FIGS. 4B and 4C) is preferably in the range of 5 ° to 120 °, more preferably in the range of 10 ° to 90 °, particularly 15 It is preferably within the range of ° to 45 °. This is because when the security card is manufactured using the card master of the present invention, the card is easily released from the card master. 4 is a schematic cross-sectional view for explaining the shape of the partition wall in the cross section taken along the line XX in FIG. 1, and the reference numerals in the figure are the same as those in FIGS. To do.

The width of the top of the partition wall is preferably small. The partition wall is a part that forms a groove (inter-lens groove) between adjacent semi-cylindrical lenses when the security card is manufactured. Depending on the size of the inter-lens groove, unnecessary information other than the image information to be displayed on the displayed image is illustrated as illustrated in FIG. 10D when observed through a lenticular lens from a desired angle. An image appears linearly (hereinafter, an unnecessary image that appears linearly may be referred to as “linear noise”), and an image to be displayed may be observed as a blurred image.
Note that the phenomenon of occurrence of linear noise and the like, and the factors causing the above phenomenon are described in the section “B. Security Card Manufacturing Method”, and thus the description thereof is omitted here.

In order to prevent the above phenomenon from occurring, it is preferable to reduce the width of the top of the partition wall, specifically within a range of 5 μm to 20 μm, especially within a range of 5 μm to 15 μm, particularly within a range of 5 μm to 10 μm. It is preferable to do.
If the width of the top of the partition wall is smaller than the above range, the depth of the semi-cylindrical lens transfer part varies due to the breaking of the partition wall, so the semi-cylindrical lens and lenticular lens that are formed by transfer function as a lens. There may be no. On the other hand, if it is larger than the above range, the bottom width of the groove portion between the lenses to be transferred and formed becomes large, so when observing the card from a predetermined angle, linear noise or the like on the image displayed through the lenticular lens May be more likely to appear.
The width of the top of the partition wall refers to the length in the short direction of the surface of the top of the partition wall, and refers to the portion indicated by X3 in FIGS.

  About the measurement location of the width | variety of the top part of a partition part, when the side surface of a partition part comprises a right angle with respect to the surface of a metal substrate, let the distance between the said side surfaces be the width | variety of a partition part. Moreover, when the side surface of a partition part makes an obtuse angle with respect to the surface of a metal substrate, let the length of the transversal direction in the plane which has the top part of the said partition part be a width | variety of a partition part. Furthermore, as shown in FIG. 4C, the top of the partition wall has a curved surface, and the semi-cylindrical lens transfer portion and the curved surface of the top of the partition wall have a continuous shape. If the position to be divided is not clear, draw an approximate straight line in the graph created by the non-contact method measurement, and specify the inflection point of the curved surface formed by the semi-cylindrical lens transfer part and the top curved surface of the partition wall part The length of the partition wall in the short direction at the inflection point is defined as the width of the partition wall. The identification of the inflection point is the same as that described in the section of the semi-cylindrical lens transfer unit described above.

It is preferable that the top of the partition wall has a curvature. This is because, when the top of the partition wall has a curvature, the card is easily released when the security card is manufactured. Further, in the obtained card, linear noise on the 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, more preferably in the range of 2.5 μm to 7.5 μm, particularly 2.5 μm to 5. It is preferable to be in the range of 0 μm. The curvature radius of the top of the partition wall refers to a portion indicated by R2 in FIG.

The height of the partition wall is the same as the depth of the semi-cylindrical lens transfer portion. Moreover, it is preferable that the topmost part of a partition part exists in the same height as a plane part. That is, it is preferable that the height from the bottom surface of the card original plate of the present invention to the longest portion of the partition wall is the same as the thickness of the card original plate.
The topmost portion refers to the highest position among the curved surfaces, for example, when the top of the partition wall has a curvature.

4). Flat part
In the present invention, the plane portion is provided on one surface of the metal substrate and refers to a region having no lenticular lens forming portion.

The flat surface portion may have a character / symbol transfer portion. The character / symbol transfer unit has image information such as characters, symbols, and symbols expressed by unevenness. An image different from the image displayed through the lenticular lens can be formed on the surface of the security card manufactured by using the card original plate of the present invention by the character / symbol transfer unit. Designability can be improved.
The line width of characters, designs, etc. in the character design transfer section is preferably about 80 μm to 500 μm, and the size is not particularly limited, and is set appropriately according to the size of the target card, etc. can do. In addition, the number of character design transfer portions on the plane portion may be one or plural.

5. Transfer master for security cards (original for cards)
The thickness of the card original plate of the present invention is appropriately set according to the thickness of the metal substrate described above, but is preferably in the range of, for example, 0.05 mm to 5 mm, and more preferably in the range of 0.2 mm to 1 mm. The inside is preferable. The reason why the thickness within the above range is preferable as the thickness of the card original plate is the same as the reason described in the section “1. Metal substrate”. In addition, the thickness of the card | curd original plate means the height from the bottom face of a card | curd original plate to a plane part.

Further, the card original plate preferably has a smooth surface, and particularly preferably has a glossy surface. This is because glossiness can be imparted to the surface of a security card manufactured using the card original plate of the present invention by making the surface glossy. The ten-point average surface roughness (Rz) of the card original is preferably in the range of 0.05 μm to 1.5 μm, and more preferably in the range of 0.1 μm to 0.5 μm.
The ten-point average surface roughness is a value measured by using an optical interference type non-contact surface roughness meter (Bartscan R3300H Lite manufactured by Ryoka System Co., Ltd.) with a profile range of +/− 5 microns. is there.
The degree of gloss is preferably gloss when polished with # 400 or more abrasive grains.

  In the card original plate of the present invention, the ratio of the area occupied by the lenticular lens forming portion is preferably about 1% to 30% when the area of one surface of the card original plate is 100%. . The number of lenticular lens forming portions in the card original plate may be one or plural.

The number of through-holes in the card original plate of the present invention is not particularly limited as long as it is at least one. The arrangement position of the through holes can be appropriately selected according to the imposition of the card original.
FIG. 5 is a schematic plan view for explaining the imposition mode of the card original plate of the present invention. In FIG. 5, illustration of the semi-cylindrical lens transfer portion and the partition wall is omitted, and the reference numerals are the same as those in FIGS. 1 and 2. In FIG. 5, the area surrounded by a two-dot chain line is an area A (hereinafter referred to as “effective transfer area A”) that is transferred onto the card surface when a security card is manufactured using the card master of the present invention. There is.) The area other than the effective transfer area of the card master is not transferred to the card surface.
Hereinafter, the arrangement positions of the through holes will be described separately for the case where the original plate for cards is in a single-sided manner and in the case of a multi-sided manner.

(1) In the case of 1-sided layout As shown in FIGS. 5 (a) and 5 (b), the card original plate of this mode has one lenticular lens forming portion 3 on the metal substrate 1 so that Thus, one security card can be manufactured for each original card. Although not shown, it is also possible to adopt a one-sided manner having a plurality of lenticular lens forming portions. That is, it is possible to manufacture one security card in which a plurality of lenticular lenses are formed for one original card.
In this embodiment, the through hole 2 may be formed in the effective transfer area A (FIG. 5A) or may be formed outside the effective transfer area A (FIG. 5B). When a through hole is formed in the effective transfer region, a reverse shape of the through hole can be formed on the surface of the security card at the time of card manufacture, and the reverse shape can be used as a pattern or a character. On the other hand, when the through-hole is formed outside the effective transfer area, the inverted shape of the through-hole is not formed on the card surface when the card is manufactured, so that the number of protrusions on the card surface can be minimized.

(2) In the case of a multi-faceted embodiment As shown in FIGS. 5 (c) to 5 (e), the card master of this embodiment has a plurality of lenticular lens forming portions 3 a to 3 c on the metal substrate 1 once. Thus, a plurality of security cards can be manufactured for each original card.
In this embodiment, the through holes 2a to 2c may be formed in the effective transfer region A (FIG. 5C), or may be formed outside the effective transfer region A (FIGS. 5D and 5E). )). Further, as shown in FIGS. 5C and 5D, the lenticular lens forming portions 3a to 3c may have through-holes 2a to 2c, respectively. As shown in FIG. You may have one through-hole 2 with respect to lenticular lens formation part 3a-3c.
Note that the effect of the card master of the present invention when the through-hole is formed in the effective transfer region and when the through-hole is formed outside the effective transfer region is described above in “(1) One-side imposition mode” Since the effect is the same as that described in “In the case of”, the description is omitted here.

6). Manufacturing Method The manufacturing method of the card original plate of the present invention is particularly a method capable of forming a lenticular lens forming portion on one surface of a metal substrate and forming a through hole penetrating from the one surface to the opposite surface. Although not limited, it is preferable to use an etching method. By directly etching the surface of the metal substrate, the lenticular lens forming portion and the through hole can be formed in a lump, and a card master can be manufactured easily and inexpensively. In the laser method, etc., the smoothness of the surface is likely to be lost due to the remaining laser irradiation traces or the dispersion of the molten material. However, the etching method is less likely to cause the above problems, so that the dimensional accuracy and placement accuracy of the lenticular lens forming part, etc. Can be high.
About a through-hole, you may form only by an etching method, the groove part containing an upper opening may be formed from the said one surface side using an etching method, and a lower opening may be formed by machining after that.

As a method for producing an original card for etching using an etching method, for example, an opening for forming a semi-cylindrical lens transfer portion and an opening for forming a through hole are desired on one surface of a metal substrate. There is a method in which a resist layer patterned so as to be in the position is formed and the metal substrate is etched by wet etching or the like.
At this time, if the thickness of the metal substrate to be used is small, the through hole can be formed by performing etching until the metal substrate is penetrated. On the other hand, when the thickness of the metal substrate is large, first, after etching up to a desired depth on one surface of the metal substrate to form an upper opening, punching, punching, embossing, etc. from the opposite surface using a drill or the like Can be made to penetrate by opening the lower opening.

B. A security card manufacturing method according to the present invention includes a metal substrate having a flat surface portion and a lenticular lens forming portion on one surface, a through hole penetrating from the one surface of the metal substrate to the opposite surface, And the lenticular lens forming portion includes a plurality of semi-cylindrical lens transfer portions arranged in a stripe shape, and a partition wall portion provided between the adjacent semi-cylindrical lens transfer portions. A plurality of semi-cylindrical lenses arranged in a stripe shape and a sheet flat portion by pressing the one surface of the card original plate against a sheet substrate laminated on one surface of the card substrate using the original plate And a lenticular lens having at least an inter-lens groove formed between the adjacent semi-cylindrical lenses. A transfer process to be performed, and the card base material is irradiated with laser light from at least two different directions through the semi-cylindrical lens, and the card base image is superimposed on the semi-cylindrical lens in plan view. And a printing step for forming the portion.

A method for manufacturing a security card according to the present invention will be described with reference to the drawings. FIG. 6 is a process diagram showing an example of a method for manufacturing a security card according to the present invention. 6 (b) and 6 (c), the reference numerals of the respective parts of the card master are omitted.
First, the card original plate 10 described in the section “A. Card original plate” is prepared. A surface having the lenticular lens forming portion 3, the flat portion 6, and the through hole 2 of the card original plate 10 becomes a transfer surface. Further, in the card original plate 10 shown in FIG. 6, the through hole 2 is disposed outside the effective transfer area A.
Next, as a transfer step, the sheet base material 22a is laminated on one surface of the card base material 21a (FIG. 6A), and the transfer surface of the card original plate 10 is positioned on the sheet base material 22a side. The transfer surface of the card original plate 10 is pressed against the sheet base material 22a while being placed on the press board Q and heated and pressurized H (FIG. 6B). After the press board Q is released, the sheet base material 22a and the card base material 21a are cooled C in a state in which the card original plate 10 is pressed (FIG. 6C).
After cooling, the card original plate 10 is peeled off (FIG. 6 (d)), and a region B (hereinafter referred to as a card effective region B) to be the card surface is cut out, whereby the lenticular lens 25 and the card substrate 21a are cut out. A lenticular lens sheet having the sheet flat portion 26 is formed. The lenticular lens 25 has a plurality of semi-cylindrical lenses 23 arranged in a stripe shape, and an inter-lens groove 24 formed between the semi-cylindrical lenses 23.
At this time, the inverted shape of the through hole 2 (hereinafter sometimes referred to as a through hole inverted portion) 28 is also formed on the sheet base material 22a, but the through hole inverted portion 28 is not in the card effective area B. For this reason, when the card effective area is cut out, the through hole inversion portion is removed, and the through hole inversion portion is not provided on the lenticular lens sheet.
Next, as a printing process, in the card base material 21a and the lenticular lens sheet 22, the card base material 21a is irradiated with laser beams Z1 and Z2 through the semi-cylindrical lens 23 (FIG. 6 (e)). As a result, the coloring material contained in the card base 21 a is carbonized, and the image part 27 (including the image part 27 a and the image part 27 b as a constituent element) such as letters and numbers is a half cylinder on the card base 21. The desired security card 100 is obtained by overlapping the shape lens 23 in a plan view (FIG. 6F).
The card effective area B can be cut out at any timing as long as the card original is peeled from the sheet base material.

  FIG. 7 is a schematic plan view showing an example of a security card obtained by the present invention, and FIG. 8 is a sectional view taken along line XX of FIG. 7 and 8 are the same as those in FIG. 6. In FIG. 7, the X direction is the short direction, the Y direction is the long direction, and the card reading direction.

According to the present invention, the card master is provided with a through hole, and when the entire card is cooled after the transfer, the sheet base material directly touches the outside air in the through hole, so that the heat of the sheet base material is easily radiated. . As a result, the cooling rate of the entire card can be increased, and the cooling time can be shortened.
In addition, since part of the air received when the card master is pressed onto the sheet base material can be degassed from the through hole, air resistance applied during transfer can be reduced. As a result, it is possible to prevent the shape of the lenticular lens sheet thus obtained from being defective due to air accumulation.
Furthermore, since the card base has a through hole, the sheet base material has a region not in contact with the card master, so even after using the card master having a glossy surface, the card is cooled. The original plate can be easily released, and a security card having a glossy surface can be produced.

Furthermore, a security card having a lenticular lens with high dimensional accuracy and placement accuracy and a sheet flat portion having high smoothness can be manufactured in a lump by using the above-described card original plate, and its card thickness. Can be made uniform. Usually, a security card such as an IC card or various certification cards has a shape, size, etc. stipulated by a standard in ISO 7816 or the like, and high accuracy is required. Can be manufactured.
Since a lenticular lens having high dimensional accuracy and placement accuracy is formed in the transfer process, when the image portion is formed in the printing process, printing is accurately performed at a position overlapping with the semi-cylindrical lens constituting the lenticular lens in plan view. When observing the image portion through the lenticular lens, information on different image portions can be clearly displayed according to the observation angle.
Thus, according to the present invention, a security card having high dimensional accuracy and excellent visibility can be easily manufactured in a short time.

  Hereafter, each process of the manufacturing method of the security card of this invention is demonstrated.

1. Transfer Process The transfer process in the present invention uses the card master described in the section “A. Card Master”, and the planar portion of the card master on the sheet base material laminated on one surface of the card base material. A lenticular having a sheet flat part, a plurality of semi-cylindrical lenses arranged in stripes, and an inter-lens groove formed between the adjacent semi-cylindrical lenses by pressing a surface having a lenticular lens forming part Forming a lenticular lens sheet having at least a lens.

(1) Card Master The card master used in this step is the same as that described in the above-mentioned section “A. Card Master”, and the description thereof is omitted here. Note that the semi-cylindrical lens transfer portion and the partition wall portion and the flat surface portion of the card original plate form a semi-cylindrical lens and an inter-lens groove portion on the lenticular lens sheet, and a sheet flat portion.
Moreover, the through-hole of the card | curd original plate forms a through-hole inversion part on a sheet | seat base material.

(2) Sheet base material The material of the sheet base material in this step is preferably flexible so that it can follow the shape of the transfer surface of the card original plate. Especially, when this step is performed by thermal transfer, it is softened by heating. It is preferable to use a material, that is, a thermoplastic resin. Further, the material may or may not have transparency, but it is preferable to have it.
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 preferably within a range of 50 μm to 100 μm including the target lenticular lens sheet in its range, and preferably within a range of 30 μm to 150 μm. It is preferably in the range of 50 μm to 100 μm. If the thickness of the sheet base material is larger than the above range, when the image portion is formed by laser irradiation or the like, the laser light may not reach the desired position of the card base material and the image portion may not be formed. is there. Moreover, the card thickness specified by the standard may be exceeded. On the other hand, if it is smaller than the above range, the lenticular lens and the sheet flat portion may not be accurately formed on the sheet base material during transfer, or the strength of the card may not be obtained.

  In addition, the size of the sheet base material is within a range of 10 μm to 200 μm including the thickness of the target lenticular lens sheet, particularly within a range of 30 μm to 150 μm, particularly within a range of 50 μm to 100 μm. Preferably there is. If the thickness of the sheet base material is larger than the above range, the laser beam may not reach a desired position on the card base material in the printing process, and an image portion may not be formed. Moreover, the card thickness specified by the standard may be exceeded. On the other hand, if it is smaller than the above range, the lenticular lens and the sheet flat portion may not be accurately formed on the sheet base material during transfer, or the strength of the card may not be obtained.

  The sheet base material is laminated on one surface of the card base material, but the lamination method is not particularly limited. Even when the sheet base material and the card base material are laminated without being bonded, it is possible to bond them by heat and pressure at the time of transfer by performing this step by the thermal transfer method.

(3) Card Base Material Examples of the card base material in this step include a resin material used as a card base material for a general security card. 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 preferred.

  The card substrate contains a coloring material in addition to the above materials. This is because the image portion can be formed on the card substrate by laser irradiation or the like. The color forming material may be any material that absorbs laser light. For example, carbon black, titanium black, black iron oxide, mica, and the like can be used, and carbon black is particularly preferable.

  The thickness of the card substrate is preferably in the range of 50 μm to 800 μm, and more preferably in the range of 300 μm to 700 μm. When the thickness of the card substrate is larger than the above range, the card thickness specified by the standard may be exceeded. On the other hand, when the thickness is smaller than the above range, the strength of the card may not be obtained.

  The size of the card substrate can be appropriately selected according to the size of the desired security card, and is preferably at least as large as the sheet substrate, and more preferably the same size as the sheet substrate. It is preferable.

(4) Transfer step The transfer method in this step may be any method that can form a lenticular lens sheet having at least a sheet flat portion and a lenticular lens on the surface of the sheet substrate, and among them, a thermal transfer method is used. Is preferred. This is because the sheet base material is softened by heating and can follow the transfer surface of the card original plate, so that a lenticular lens sheet can be formed with high accuracy. As the thermal transfer method, a general method can be used, for example, the method described with reference to FIG.

  The pressurizing condition in this step may be a pressure that can sufficiently transfer the shape of the transfer surface of the card master, and is preferably a pressure at which the through hole is sealed when the card master is pressed. . This is because if the through hole is not sufficiently sealed, the sheet base material may flow out of the through hole when the pressure is applied. The degree of pressurization can be appropriately set according to the thickness of the sheet base material.

In addition, the heating condition in this step is not particularly limited as long as it is a temperature that can sufficiently soften the sheet base material to the extent that it can follow the transfer surface of the card original plate. For example, about 200 ° C. is preferable.
Furthermore, the heating time is appropriately set depending on the pressurizing condition and the heating condition, and is preferably about 20 minutes, for example.

In this step, it is preferable to perform a cooling treatment after the thermal transfer. This is because the cooling process prevents the lenticular lens from being deformed and the card is easily peeled off from the original card.
As a cooling method, a method of cooling the entire sheet base material, card base material, and card original plate is preferable. For example, a method of cooling in a heating furnace, a method of cooling by applying cold air, or the like can be used. In particular, it is preferable to cool the card original plate by directly applying cold air to the penetrating portion thereof. This is because the cooling rate of the entire card can be increased by cooling the surface of the sheet base material exposed in the penetrating portion.

  The cooling time in this step is not particularly limited, but when rapidly cooled in a short time, the thermal contraction rate of the sheet substrate and the card original plate is different, so that the obtained lenticular lens sheet does not have a desired shape. In some cases, the surface may not be smooth.

  When the card original plate has the character / design transfer portion in the flat portion, when the sheet flat portion is transferred and formed by this step, the character / design transfer portion is also transferred to form the character / design portion. .

(5) Lenticular lens sheet By this process, a lenticular lens sheet having at least a lenticular lens and a sheet flat portion is formed.

(A) Lenticular lens The lenticular lens formed by this process has a plurality of semi-cylindrical lenses arranged in a stripe shape and an inter-lens groove formed between the adjacent semi-cylindrical lenses. .

(I) Semi-cylindrical lens The shape of the semi-cylindrical lens formed in this step is the same as the inverted shape of the semi-cylindrical lens transfer portion of the card original. That is, the width, thickness, curvature radius, and pitch width of the formed semi-cylindrical lens are the same as the width, depth, curvature radius, and pitch width of the semi-cylindrical lens transfer portion. Since the above dimensions and other details of the semi-cylindrical lens are the same as those described in the section “A. Card Master”, description thereof is omitted here.

Note that the width of the semi-cylindrical lens refers to a portion indicated by X4 in FIG. If the semi-cylindrical lens and the inter-lens groove are continuous and the position where the semi-cylindrical lens is separated is not clear, measure the width of the semi-cylindrical lens transfer section described in the section “A. Card Master”. It is measured using a method similar to the method.
Further, the thickness of the semi-cylindrical lens refers to the length from the most apex of the semi-cylindrical lens to the lowest point of the inter-lens groove, which is a portion indicated by T3 in FIG. The thickness of the semi-cylindrical lens is equal to the depth of the inter-lens groove described later.
The radius of curvature of the semi-cylindrical lens refers to the portion indicated by R3 in FIG. 8, and the pitch width refers to the distance between the centers of adjacent semi-cylindrical lenses (X5 in FIG. 8).

(Ii) Inter-lens groove The inter-lens groove formed in this step has the same shape as the inverted shape of the partition wall of the card master.

  The inter-lens groove is preferably formed such that the bottom width is within a desired range. This is because, when the image portion is visually recognized through the lenticular lens, it is possible to suppress the appearance of linear noise or the like on the image portion and to prevent the image display from being hindered.

  Here, “linear noise or the like appears on the image portion” means that when viewing the image on the security card through the lenticular lens, as shown in FIG. In addition to a phenomenon in which a thin portion of an image is linearly generated as a linear noise L along the longitudinal direction of the image, and an image to be displayed at a desired angle, images other than the information of the image are simultaneously generated as a plurality of linear noises L. A phenomenon that is displayed.

The cause of this phenomenon 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 desired 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, The image area other than the image area to be visually recognized through the lenticular lens (these may be referred to as “non-image area”) is also visually recognized, and the observer visually observes through the lenticular lens. The image of the image portion to be viewed and the non-image portion region viewed through the inter-lens groove portion are simultaneously viewed.
At this time, since the non-image portion area appears as linear noise on the image portion displayed as described above, the shape of the visually recognized image is impaired, and the entire image is recognized as being unclear. It is guessed.
Therefore, by making the bottom width of the inter-lens groove portion small, it is possible to suppress the appearance of linear noise or the like on the visually recognized image due to the bottom width of the inter-lens groove portion.

  The bottom width of the inter-lens groove and the measuring method thereof are the same as the width of the top of the partition wall and the measuring method described in the section “A. In addition, the bottom width of the groove part between lenses means the length of the groove part between lenses in the transversal direction, and is a part indicated by X6 in FIG.

Moreover, it is preferable that the groove part between lenses becomes a shape where a bottom part has a curvature. This is because, when visually recognizing the image portion through the lenticular lens, linear noise or the like appearing on the visually recognized image can be made inconspicuous, and visibility hindrance can be suppressed.
The curvature radius at the bottom of the inter-lens groove and the measuring method thereof are the same as the curvature radius of the top of the partition wall and the measuring method described in the section “A. To do. The radius of curvature of the bottom of the inter-lens groove is a portion indicated by R4 in FIG.

  The depth of the inter-lens groove is the same as the thickness of the semi-cylindrical lens. Further, the other details of the inter-lens groove are the same as those of the partition wall described in the section “A. Card Master”, and therefore the description thereof is omitted here.

(Iii) Lenticular Lens The thickness and the radius of curvature of the lenticular lens formed in this step correspond to the thickness and the radius of curvature of the semi-cylindrical lens described above, and thus description thereof is omitted here. The size of the lenticular lens is the same as that of the lenticular lens forming portion of the card original plate, and the number of semi-cylindrical lenses in the lenticular lens is determined by the number of semi-cylindrical lens transfer portions in the card original plate.

(B) Sheet flat part The sheet flat part formed by this process is an area | region in which the lenticular lens is not formed at least on a lens curl lens sheet.

The sheet flat part may have a character design part. This is because information different from the information of the image portion visually recognized through the lenticular lens can be transferred to improve the security and design of the card.
The details of the character design portion are the same as those of the character design transfer portion described in the section “A.

(C) Lenticular lens sheet In this process, as shown in FIG. 9, you may have a through-hole inversion part on a lenticular lens sheet. That is, the through-hole reversing part 28 may be formed in the card effective area B shown in FIG. This is because by having the through hole reversal portion on the lenticular lens sheet, the through hole reversal portion can be used as a pattern, a character, or the like on the surface of the obtained card.

  The shape of the through-hole reversing part depends on the shape of the through-hole in the card original plate, but can be, for example, a convex curved surface having a protrusion on the top. Specifically, since it is the same as the content described in the above-mentioned section “A. Original Master for Card”, the description is omitted here.

The height of the through hole reversing part is usually larger than the thickness of the lenticular lens and is the same as the thickness of the card original. The height of the through hole reversing part refers to the height from the sheet flat part to the top of the through hole reversing part.
The formation position of the through hole reversal portion is not particularly limited as long as it is on the lenticular lens sheet, but is usually formed on the sheet flat portion.

  The thickness of the lenticular lens sheet refers to the height from the bonding surface with the card substrate to the highest vertex of the lenticular lens or through hole reversal part on the opposite side of the bonding surface. Similar to thickness.

2. Printing process In the printing process of the present invention, the card base is irradiated with laser light from at least two different directions via the semi-cylindrical lens, and the card base is overlapped on the card base in plan view. Is a step of forming.
Note that the image portion has characters, figures, symbols, patterns, and the like.

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, a gas laser, a YAG laser, a semiconductor laser, a fiber laser, a surface emitting laser or the like has a wavelength range of 700 nm to 1300 nm. And a light source that emits infrared rays. Note that 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 drawn.
The laser beam may be irradiated from at least two different directions at a desired position on the card substrate, and the direction and the like can be the same as those of a general laser irradiation method.

The position at which the image portion is formed in this step is not particularly limited as long as it is a place overlapping the semi-cylindrical lens in plan view. Such a position is usually on the card substrate surface in contact with the sheet substrate, but may be on the surface opposite to the surface in contact with the sheet substrate, or may be formed inside the card substrate. Good.
The size of the image portion is preferably a size that does not exceed the area covered by the semi-cylindrical lens. Furthermore, although the image part located under the lenticular lens is normally composed of two types of different image information, it may have two or more types.

3. Other Steps The security card manufacturing method of the present invention may have other steps as necessary in addition to the above-described printing step. For example, there is a cutting-out process for cutting out the card effective area after at least releasing the card original from the sheet base material.

4). Security card The security card obtained by the present invention, as shown in FIGS. 7 and 8, has a card substrate having an image portion, and a lenticular lens sheet disposed on one surface of the card substrate, The lenticular lens sheet has at least a plurality of semi-cylindrical lenses arranged in stripes and a range lens having a groove between lenses, and a flat sheet portion, and the semi-cylindrical lens and the image portion are flat. It is arranged so as to overlap visually. The security card has a different image part visually recognized through the lenticular lens according to the observation angle.
Further, the security card may have a through hole reversing part on the lenticular lens sheet as shown in FIG.
In addition, about each site | part of a security card, since it is the same as that of what was demonstrated at each process mentioned above, description here is abbreviate | omitted.

  Here, “the image portion to be visually recognized differs depending on the observation angle” means that the lenticular lens 25 having a plurality of semi-cylindrical lenses 23 and inter-lens groove portions 24 at one observation angle E1, as shown in FIG. Only the information of the image portion 27a (FIG. 10B) on the card base material 21 can be visually recognized as an image via the lenticular lens, and the card base material 21 can be viewed via the lenticular lens 25 at another observation angle E2. This means that only the information (FIG. 10C) of the image portion 27b is visually recognized as an image.

  Further, the security card obtained by the present invention has a magnetic sheet, a dye ink printing layer, a pigment ink printing layer, an IC chip, a transparent cover layer, and the like as necessary in addition to the card base and the lenticular lens sheet. May be.

  In the security card obtained by the present invention, the longitudinal direction of the semi-cylindrical lens in the lenticular lens is preferably the same as the longitudinal direction of the security card, that is, the direction in which magnetic information is read through a card reader. This is because when the card is passed through the card reader, the portion of the lenticular lens becomes an obstacle and cannot pass through the card reader, and magnetic information may not be read.

  In the security card obtained by the present invention, the proportion of the lenticular lens is appropriately set according to the size of the entire card, the size of the image portion on the card base, and the like. About 1% to 30% is preferable with respect to%.

  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, IC cards, various certification cards, government documents It can be used for information media that require confidentiality.

  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]
(Manufacture of original cards)
<Resist layer forming step>
A SUS304 material, which is a rolled material having a plate thickness of 0.5 mm and a 300 mm square size, was prepared as a metal substrate used for the card original plate. 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 used on the surface of the metal substrate that had been subjected to the surface conditioning treatment, and lamination was performed using a laminator to form a photoresist layer having a thickness of about 15 μm to 25 μm. Next, after performing pattern exposure by ultraviolet irradiation through a mask using a parallel light exposure machine, development was performed with a 1% aqueous sodium carbonate solution at 30 ° C., and a photoresist layer was patterned.
With respect to the pattern of the photoresist layer, in order to form a lenticular lens within the size of the metal substrate described above, the effective area per card on the metal substrate is set to about 85 mm × 50 mm, and the vertical and horizontal areas are included in the effective area. In this pattern, rectangular lenticular lens forming portions each having a size of about 20 mm are arranged, and through holes are arranged outside the card effective area. The arrangement position of the lenticular lens forming portion was the lower left portion of the obtained card.

<Etching process>
By etching through the patterned photoresist layer, the shape of the lenticular lens forming part and the flat part having a semi-cylindrical lens transfer part and a partition part in an effective area of about 85 mm × 50 mm on the metal substrate is obtained. Obtained. Further, through holes having a diameter of 7 mm were formed outside each effective area, a plurality of card masters of the present invention were obtained.

<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, it is assumed that the width of the top of the partition wall, the width, the depth, the pitch width and the radius of curvature of the bottom of the semi-cylindrical lens transfer portion can be mainly controlled as the processing shape. processed.
As a result of the verification, a shape that was changed stepwise every 5 μm was obtained within the range of 15 μm to 35 μm of the width of 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.

[Comparative Example 1]
A card original plate was obtained in the same manner as in Example 1 except that the through hole was not formed on the metal substrate.

[Example 2]
(Manufacture of security cards)
<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) containing polycarbonate as a main component was prepared in advance.
The card original plate obtained in Example 1 was mounted on a flat plate press, and the laminate was pressed at 200 ° C. for 20 minutes at 1 kg / cm ² . It took 15 minutes to reach the temperature at which the sheet substrate was cured.
After cooling, the flat pressing machine was opened, and the original card was released from the sheet base material. By this implementation, the concave and convex shape on the surface of the card original plate is transferred onto the sheet base material, the sheet flat portion and the lenticular lens are provided, and the lenticular lens is arranged between the plurality of semi-cylindrical lenses and the lenses arranged in stripes. A lenticular lens sheet having a groove was obtained.

<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. By this implementation, an image part was formed on the card base material, and the intended security card having different visual images of the image part according to the observation angle was obtained.

[Comparative Example 2]
A security card was manufactured in the same manner as in Example 2 except that the card original plate of Comparative Example 1 was used. However, after the pressing was performed under the same conditions as in Example 2 in the transfer step, the time required to reach the temperature at which the sheet base material was cured was 30 minutes.

[result]
From the difference in the cooling time in the transfer process of Example 2 and Comparative Example 2, it became clear that the card original plate having the through holes has a cooling effect and can shorten the manufacturing time.

DESCRIPTION OF SYMBOLS 1 ... Metal substrate 2, 2a, 2b, 2c ... Through-hole 3, 3a, 3b, 3c ... Lenticular lens formation part 4 ... Semi-columnar lens transfer part 5 ... Partition part 6, 6a, 6b, 6c ... Plane part
10 ... Transfer master for security cards (original for cards)
DESCRIPTION OF SYMBOLS 21 ... Card base material 22 ... Lenticular lens sheet 23 ... Semi-cylindrical lens 24 ... Inter-lens groove part 25 ... Lenticular lens 26 ... Sheet flat part 27 ... Image part 100 ... Security card A ... Area transferred on the card surface (effective transfer) region)

Claims (5)

A metal substrate having a planar portion and a lenticular lens forming portion on one surface;
A through hole penetrating from the one surface of the metal substrate to the opposite surface,
The lenticular lens forming section includes a plurality of semi-cylindrical lens transfer sections arranged in a stripe shape, and a partition wall section provided between the adjacent semi-cylindrical lens transfer sections. Transfer master for cards.   2. The security card transfer original plate according to claim 1, wherein an opening width on the one surface side of the through hole is larger than an opening width on the opposite surface.   The transfer original plate for a security card according to claim 1 or 2, wherein the through hole is arranged in a region to be transferred to the surface of the security card.   The transfer original plate for a security card according to claim 1 or 2, wherein the through hole is disposed outside a region to be transferred to the surface of the security card. A metal substrate having a planar portion and a lenticular lens forming portion on one surface;
A through hole penetrating from the one surface of the metal substrate to the opposite surface,
A security card transfer original plate, wherein the lenticular lens forming portion has a plurality of semi-cylindrical lens transfer portions arranged in stripes, and a partition wall portion provided between the adjacent semi-cylindrical lens transfer portions. Use
Pressing the one surface of the security card transfer original plate onto a sheet substrate laminated on one surface of the card substrate, a sheet flat portion, and a plurality of semi-cylindrical lenses arranged in stripes, and A transfer step of forming a lenticular lens sheet having at least a lenticular lens having an inter-lens groove formed between the adjacent semicylindrical lenses;
A printing process in which the card base is irradiated with laser light from at least two different directions through the semi-cylindrical lens to form an image portion on the card base so as to overlap the semi-cylindrical lens in plan view. And a method for manufacturing a security card.