CN209915174U - Coin and souvenir badge with invisible patterns on edge - Google Patents

Abstract

The utility model relates to a coin and souvenir badge with invisible patterns on the edge, coin edge of coin and souvenir badge，The invisible pattern setting area is provided with at least one group of invisible pattern setting areas, each invisible pattern setting area is provided with a group of trapezoidal strips which are arranged in parallel, one side surface or two side surfaces of each trapezoidal strip are provided with continuous or discontinuous notches, the continuous or discontinuous notches in one invisible pattern setting area form one invisible pattern, and the content of the invisible pattern comprises characters, symbols, patterns or numbers. Because the utility model arranges the anti-counterfeiting invisible patterns on the edge part, the anti-counterfeiting grade of the coins and the souvenir medals is improved, and the invisible patterns are not easy to be perceived, so that the counterfeiting technology can not be imitated,simultaneously the utility model discloses can be applied to on various conventional coins or the special-shaped coin, have extensive suitability.

Description

Coin and souvenir badge with invisible patterns on edge

Technical Field

The utility model belongs to the technical field of the technique of making coins and specifically relates to a coin and souvenir badge that limit portion has stealthy pattern.

Background

In the prior art, precious metal souvenir medals such as gold, silver, platinum and the like, circulating coins and common souvenir medals have been common to apply invisible patterns on the surfaces of products. The applied invisible anti-counterfeiting technology mainly comprises the following types:

(1) ① is the stealth of the structure of the polypyramid, namely the pattern formed by the cluster of the same surface of the tiny polypyramid, ② is the stealth of the crossed line structure, namely a plurality of groups of parallel polypyramids in different directions form different patterns respectively, the intersection of the common parts of the flat cables in different groups is taken, and the common tiny polypyramid structure replaces the line.

Because of the invisible property, which is used for improving the product safety and has the public anti-counterfeiting identification characteristic, the application is expanded from the gold, silver, platinum and other precious metal memorial badges to the common memorial badge and circulation coin.

Such as (stealth of trapezoidal stripe structure): the Spanish Olympic conference commemorates silver coins and has double-sided invisible patterns of squatting and running of athletes. New Canada edition 2 Canada Yuan circulation coin, distribute two independent "maple leaves" single face stealth pattern (see figure 1, figure 2).

In the aspect of the manufacturing method, the existing invisible patterns are manufactured on the surface planes of the upper and lower stamping dies in a single dimension and then are transferred to the surface planes of the coins through the stamping dies. However, the invisible patterns on the surface plane of the coin are easy to be reversely imitated by using methods such as true coin copying and cloning, the safety is obviously reduced, and the situation that the invisible patterns on the surface plane of the true coin are scanned and imitated and fake is carried out by using equipment such as a common copying engraving machine also exists, and the imitation threshold is not high.

The prior invisible patterns are only manufactured on the front and back planes of the coin and seal, and the block of multidimensional space at the edge part is still lacked in terms of the full face of showing the invisible on the coin and seal, and a corresponding manufacturing method is not seen.

However, for the precious metal commemorative coins and medals such as gold, silver and platinum with high value and the common commemorative medals, a novel and effective anti-counterfeiting means is still lacked and needed, how to improve the anti-counterfeiting of the coins and increase the machine-readable identification characteristics is a development direction of the coin (medal) anti-counterfeiting technology.

Disclosure of Invention

An object of the utility model is to provide a limit portion has coin and souvenir badge of stealthy pattern, changes the limit portion of coin badge and increases stealthy pattern, improves anti-fake effect.

In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a limit portion has coin and memorial tablet of stealthy pattern which characterized in that: the edge of the coin and the souvenir badge is provided with at least one group of invisible pattern setting areas, and the invisible pattern setting areas are provided with a group of trapezoidal patterns which are arranged in parallelStrip for packaging articlesTrapezoid shapeStrip for packaging articlesThe side surface or the double side surface of the invisible pattern is provided with continuous or discontinuous grooves, the continuous or discontinuous grooves in the invisible pattern setting area form an invisible pattern, and the contents of the invisible pattern comprise characters, symbols, patterns or numbers.

Preferably, the invisible pattern setting area is arranged on a plane or an arc-shaped surface, namely a trapezoidStrip for packaging articlesPerpendicular or parallel to the central axis of the coin or medal.

Furthermore, the invisible pattern setting area is arranged on a plane or an arc-shaped surface, an included angle is formed between the trapezoidal strip and the central axis of the coin or the memorial tablet, and the included angle is larger than or equal to 0.1 degree and smaller than 180 degrees. The included angle arranged on the plane is usually 30 degrees, 45 degrees, 60 degrees or 120 degrees, 135 degrees and 150 degrees; to the included angle that sets up on the arcwall face: typically 12 degrees, 18 degrees or 162 degrees, 168 degrees.

Furthermore, the invisible pattern setting area is arranged on the plane or the arc-shaped surface of the coin edge, the trapezoidal upper top surface of the trapezoidal strip is parallel to the plane or the arc-shaped surface of the coin edge, the trapezoidal strip protrudes outwards or is kept flat on the plane or the arc-shaped surface of the coin edge, the height of the protruding trapezoidal strip is smaller than or equal to the height H of the trapezoidal strip, and the value of the height H is within the range of 0.04 mm to 0.1 mm.

The invisible pattern setting area is arranged on the plane or the arc-shaped surface of the coin edge, and for the invisible patterns arranged on the plane of the coin edge: the height value H of the trapezoid strips is 0.04 mm to 0.1 mm, the cone vertex angle alpha of each trapezoid strip is 90 degrees to 120 degrees, the distance L between every two adjacent trapezoid strips is 0.17 mm to 0.34 mm, the notch grooves on the trapezoid strips are provided with notch groove vertex angles, the notch groove vertex angle beta is equal to one fourth of alpha, the notch groove height H is smaller than or equal to the height H of the trapezoid strips, and the distance M from the notch grooves to the edges of the trapezoid strips is larger than or equal to 0.1 mm;

invisible patterns arranged on the arc-shaped surface of the edge part of the coin: the height H of the trapezoid strips is 0.04 mm to 0.1 mm, the cone vertex angle alpha of the trapezoid strips is 90 degrees to 120 degrees, the arc length distance S or the distance L between the trapezoid strips is 0.16 mm to 0.35 mm, the notch grooves on the trapezoid strips are provided with notch groove vertex angles, the notch groove vertex angle beta is equal to one fourth of alpha, the notch groove height H is smaller than or equal to the height H of the trapezoid strips, and the distance N from the notch grooves to the edges of the trapezoid strips is larger than or equal to 0.1 mm.

Compared with the prior art, the technical scheme of the utility model except whole technical scheme's difference, still include the difference in the aspect of a lot of details, particularly, have following beneficial effect:

1. different schemes, the coin limit portion of coin and memorial tablet is equipped with at least a set of stealthy pattern and sets up the region, stealthy pattern sets up the region and is equipped with a set of trapezoidal strip that parallel arrangement each other, a side or the bilateral face of trapezoidal strip are equipped with continuous or discontinuous grooving, these continuous or discontinuous grooving in a stealthy pattern sets up the region forms a stealthy pattern, these stealthy patterns established at the coin and medal limit portion, carve and establish on the cubical space of limit portion, the naked eye can't be discerned totally usually, or can only see the small fragment, the whole stealthy pattern is only clearly visible under the discernment of anti-counterfeiting machine, the anti-counterfeiting performance of coin and medal has been promoted;

2. in the technical scheme of the utility model, the content of stealthy pattern includes characters, symbol, pattern, or digit, and these stealthy patterns can the combination distribution, also can distribute alone at coin chapter's limit, have promoted holistic anti-fake technology level, and the form is various simultaneously, not only can have unilateral stealthy pattern and two side stealthy pattern, still can have more stealthy changes of direction setting, makes current counterfeit technology can't imitate;

3. the invisible pattern setting area of the utility model is arranged on the space plane or the arc surface, can adapt to the appearance requirements of different coins and souvenir medals, and has universality and easy popularization;

4. the utility model discloses an invisible pattern can adopt to rub the preparation method or split die sleeve method preparation, not only can be fit for large batch coin chapter and make, also can carry out the processing of small-scale or customization business, and the suitability is wider.

Drawings

Fig. 1 and 2 are schematic structural diagrams in the prior art.

Fig. 3a is a schematic structural diagram of an embodiment of the present invention.

Fig. 3b is a partially enlarged schematic view of fig. 3 a.

Fig. 4 is a schematic structural diagram of another embodiment of the present invention.

Fig. 5a is a schematic view of the invisible trapezoid strip structure and the pattern groove formed on the edge plane according to the present invention.

FIG. 5b is a schematic view of the invisible trapezoid strip structure and the pattern notch groove formed on the edge portion of the arc surface of the present invention

Fig. 5c is a schematic view of another invisible trapezoidal stripe structure and pattern groove formed on the edge arc surface according to the present invention.

Fig. 6 a-6 c are schematic views of the invisible patterns of the present invention formed on the small plane of the edge of the circular coin.

Fig. 7 a-7 d are schematic diagrams of the invisible patterns of the present invention formed on the arc surface of the edge of the special-shaped coin.

Fig. 8a is a schematic view of the invisible pattern of the present invention formed on the plane of the edge of the special-shaped coin.

Fig. 8 b-8 c are enlarged partial views of fig. 8 a.

Fig. 9 a-9 e are schematic structural views of the invisible patterns of the present invention formed in the grooves of the coin edge.

Fig. 10a is a schematic view of the hidden pattern of the present invention.

Fig. 10b is a partially enlarged schematic view of fig. 10 a.

Fig. 11 a-11 e are schematic diagrams of hidden patterns and different surface distributions hidden by the present invention.

Fig. 12 a-12 b are schematic diagrams of the machine reading process of the invisible patterns according to the present invention.

Reference numerals:

1, double-sided invisible patterns on the surface of a coin, 2 single-sided invisible patterns on the surface of the coin, 3 coin edges, 4 coin shaft diameters, 5 pattern arrangement areas, 6 trapezoidal strips, 7 invisible patterns and 8 grooves;

10 rectangular plane, 11 circular plane, 12 coin upper and lower surfaces, 14 small plane, 15 first invisible pattern, 16 second invisible pattern;

17, an arc surface at the edge of the special-shaped coin, 18 third invisible patterns, 19 trapezoidal strips on the arc surface and 20 fourth invisible patterns;

22, a plane of the edge of the special-shaped coin and 23 of a fifth invisible pattern;

31 arc surface of edge of coin, 32 double-sided hidden pattern, hidden pattern fragment hidden by 40, 41 hidden pattern machine recognition device.

Detailed Description

The invention is further described with reference to the following figures and examples.

What a limit portion have coin and souvenir medal of stealthy pattern, specifically refer to the structure in figure 3, figure 4, figure 5, its difference with prior art lies in: the coin edge 3 of the coin and the souvenir badge is provided with at least one group of invisible pattern setting areas 5 which are provided with a group of trapezoids arranged in parallelStrip for packaging articles6, trapezoidStrip for packaging articlesIs provided with continuous or intermittent engraved grooves 8, which form a hidden pattern 7 in a hidden pattern arrangement area, the content of which includes characters, symbols, patterns or numbers.

Preferably, the invisible pattern setting area is arranged on a plane or an arc-shaped surface, the central axes of the trapezoidal strip and the coin or the medal are mutually vertical or parallel, the two side surfaces of the trapezoidal strip can be grooved on a single side or double sides, after the groove is grooved on the single side, when the coin or the medal rotates towards one direction, the invisible pattern can be displayed, and when the coin or the medal rotates in the opposite direction, the invisible pattern cannot be displayed. The double-side grooving can display invisible patterns respectively when the coin or the memorial tablet rotates forwards or backwards, and the two invisible patterns can be the same or different so as to achieve the enhanced anti-counterfeiting effect.

Furthermore, the invisible pattern setting area is arranged on a plane or an arc-shaped surface, an included angle is formed between the trapezoidal strip and the central axis of the coin or the memorial tablet, and the included angle is larger than or equal to 0.1 degree and smaller than 180 degrees. The included angle arranged on the plane is usually 30 degrees, 45 degrees, 60 degrees or 120 degrees, 135 degrees, 150 degrees which are symmetrical; to the included angle that sets up on the arcwall face: typically 12 degrees, 18 degrees or 162 degrees, 168 degrees symmetrical thereto. . Have the trapezoidal strip of an contained angle with the center pin, two sides of trapezoidal strip also can carry out unilateral grooving or two side grooving, when coin or memorial tablet carry out corresponding heeling, can show stealthy pattern to reach the anti-fake effect of strengthening the multiple direction change.

Furthermore, the invisible pattern setting area is arranged on the plane or the arc-shaped surface of the coin edge, the trapezoidal upper top surface of the trapezoidal strip is parallel to the plane or the arc-shaped surface of the coin edge, the trapezoidal strip protrudes outwards or is kept flat on the plane or the arc-shaped surface of the coin edge, the height of the protruding trapezoidal strip is smaller than or equal to the height H of the trapezoidal strip, and the value of the height H is within the range of 0.04 mm to 0.1 mm.

Fig. 5a shows: the trapezoidal upper top surface of a set of trapezoidal strip that parallel arrangement each other keeps paralleling, just is the setting of keeping equal with the plane of the straight edge form dysmorphism coin limit portion, and the height value of trapezoidal strip is H. Fig. 5b shows: a group of trapezoidal strips which are arranged in parallel are parallel to the arc-shaped surface of the edge of the round coin, are arranged in a convex manner and have a convex value of H. FIG. 5c shows: a group of trapezoidal strips which are arranged in parallel are parallel to the arc-shaped surface of the edge of the plum blossom-shaped coin, are arranged in a convex manner, and the convex value is set to be H.

The specific parameters of the trapezoidal stripes and the grooves of the invisible patterns are as follows:

a group of trapezoidal strips and grooving parameters which are arranged on the plane of the edge part of the coin and are arranged in parallel are as follows: the height H =0.04 ~ 0.1 millimeter of trapezoidal strip, the awl apex angle (degree) alpha =90 ~ 120 degrees of trapezoidal strip, interval L =0.17 ~ 0.34 millimeter between the trapezoidal strip, and the grooving parameter of its stealthy pattern is: the vertex angle is beta = alpha/4, the height H of the notch is less than or equal to the height of the trapezoid strip (H is less than or equal to H), the distance M from the notch to the edge of the trapezoid strip is greater than or equal to 0.1 mm, and the width and the position of the single notch are determined according to the invisible pattern.

A set of trapezoidal strip and grooving parameter that sets up on coin limit portion arcwall face, parallel arrangement each other do: the height H = 0.04-0.1 mm of the trapezoid strip, the cone apex angle (degree) alpha = 90-120 degrees of the trapezoid strip, and the arc length spacing S (or spacing L) = 0.16-0.35 mm between the trapezoid strips, and the grooving parameters of the invisible pattern are as follows: the vertex angle is beta = alpha/4, the height H of the notch is less than or equal to the height of the trapezoid strip (H is less than or equal to H), the distance N from the notch to the edge of the trapezoid strip is greater than or equal to 0.1 mm, and the width and the position of the single notch are determined according to the invisible pattern. See in particular fig. 5.

First invisible Pattern embodiment

The invisible patterns are manufactured on the arc surface of the cylinder at the edge of the round coin: the invisible patterns are made along the arc surface 3 of the cylinder at the edge of the round coin. The direction of the trapezoid strip structure can be perpendicular to the coin axis diameter 4, or parallel to the coin axis diameter, or can be properly staggered with the coin axis diameter, or both. On the periphery, there are several groups of trapezoidal strip structures in different directions, and there are hidden patterns 7 engraved on the periphery, and the naked eye can observe and identify the pattern along the periphery in sections, see fig. 3 a.

For example: the invisible patterns 7 are made on the same part on the arc surface of the round coin, the two sides of the trapezoid strip are respectively engraved with double-sided invisible '0' and '1', and the trapezoid strip is arranged perpendicular to the axial diameter direction of the coin. 0 is seen visually in one side direction and 1 is seen visually in the other side direction, see fig. 3 b.

Second invisible Pattern embodiment

The invisible patterns are manufactured on the small planes manufactured by the cylinders at the edge parts of the round coins: the manufactured small plane refers to a small plane which is manufactured along a cylinder body at the edge of the circular coin through tangency with the surface of the cylinder body or protrusion or embedding, belongs to a special small plane at the arc edge of the circular coin, and can be a single small plane or a plurality of small planes with different surfaces, and the dynamic effect generated when the invisible patterns are read is ensured through the fluctuation arrangement of the small planes, and the invisible patterns can be seen in the rotation process of the coin. The shape of the facet can be made into various geometric shapes, such as: a rectangular plane 10, a circular plane 11, etc. The facets may border or be embedded with the front and back surfaces of the coin, as required by the number and distribution of the facets along the product perimeter.

The invisible patterns are made on the small plane 14, and the directions of the trapezoid strip structures are arranged from 0 degree to 360 degrees as required. The invisible patterns can be observed and identified one by naked eyes.

For example: the side length of the square small plane is 4 mm, the square small plane is tangent to the surface of the cylinder at the edge of the round coin, the square small plane is connected with the upper surface and the lower surface, and double-sided invisibility with trapezoidal strips forming an included angle of 45 degrees with the axial diameter is manufactured on the square small plane, namely a first invisibility pattern 15 and a second invisibility pattern 16, and different angles respectively display '1' and '0'. The parameters of the group of parallel trapezoidal strips and the invisible grooves are as follows: the apex angle (degree) of the trapezoid is α =92 ° and the pitch L =0.2 mm, the height H =0.05 mm, the groove apex angle (degree) of the invisible pattern is β = α/4=23 °, and the groove height H =0.045 mm. The trapezoidal strips arranged in parallel with each other are kept in parallel with the square facets and are arranged in a convex manner, and the convex height is =0.05 mm. The minimum distance M =0.5 mm from the notch to the edge of the trapezoidal bar. See in particular fig. 6a to 6 c. The trapezoidal stripe and grooved structure on the facet is seen in fig. 5 a.

Third invisible Pattern embodiment

The invisible patterns are manufactured on the curved surface or the cambered surface of the cylinder at the edge of the special-shaped coin: the invisible patterns are made along the arc surface 17 of the edge of the special-shaped coin, namely on the convex arc surface or the concave arc surface, or both. The third invisible pattern 18 is made along the curved surface of the cylinder at the edge of the special-shaped coin, namely on the curved surface with both convex arc and concave arc.

The direction of the trapezoid strips 19 on the arc-shaped surface can be perpendicular to the coin axis diameter 4, or parallel to the coin axis diameter, or can be properly staggered with the coin axis diameter, or simultaneously. The direction of the trapezoid strip structure is perpendicular to the invisible patterns of the coin shaft diameter, and the invisible patterns can be identified by naked eyes in a segmented mode.

For example: the double-sided invisible patterns, namely the third invisible pattern 18 and the fourth invisible pattern 20, on the same part of the two sides of the trapezoidal strip, which are manufactured on the curved surface of the cylindrical body at the edge of the eight-petal quincunx, respectively display a third invisible pattern and a second invisible pattern in different directions, and the direction of the trapezoidal strip structure is vertical to the axis diameter of the coin. "three" is seen visually in one direction and "two" is seen visually in the other direction. See in particular fig. 7a to 7 d.

The group of trapezoidal strips and grooving parameters which are arranged on the arc-shaped curved surface of the edge of the coin and are arranged in parallel are as follows: the height H =0.05 mm of the trapezoid strip, the cone apex angle (degree) alpha =102 ° of the trapezoid strip, and the spacing L =0.21 mm between the adjacent trapezoid strips, and the grooving parameters of the invisible pattern are as follows: the apex angle is β = α/4=25.5 °, the height of the score groove h =0.05 mm, the minimum distance N from the score groove to the edge of the trapezoidal bar =0.4 mm, and the arc length of the individual score groove =2.5 mm. The trapezoidal strips which are arranged in parallel are parallel to the arc-shaped curved surface of the edge part of the coin and are arranged in a convex manner, and the convex height is =0.05 mm. The cross-sectional view of the trapezoidal bars and the grooved structure are shown in fig. 5 c.

Fourth invisible Pattern embodiment

The invisible patterns are manufactured on the edge plane 22 of the special-shaped coin: the direction of the trapezoid strip structure can be arranged from 0 degree to 360 degrees as required on a single plane or a plurality of planes with different surfaces. The invisible pattern can be visually observed and identified in a face-to-face manner.

For example: the fifth invisible pattern 23 is manufactured on a single plane of a cylinder at the edge of the regular hexagon, and the double-sided invisible parts 1, 2 and 3, 4 on two sides of the trapezoid strip at the same part are manufactured, the direction of the trapezoid strip structure is parallel to the axis diameter of the coin, the parts 1 and 2 are seen by naked eyes in the direction of one side, and the parts 3 and 4 are seen by naked eyes in the direction of the other side. See in particular fig. 8 a-8 c.

Fifth invisible Pattern embodiment

Coin limit portion is equipped with coin limit portion recess, and stealthy pattern preparation is on the cambered surface or the plane of coin limit portion recess: the invisible patterns are made on the cambered surfaces in the whole grooves or the discontinuous grooves at the edge parts. Such as: the arc surface of the groove at the edge of the round coin (figure 9 a) and the arc surface of the groove at the edge of the nonagon coin (figure 9 b).

The invisible patterns are made on the column planes in the whole grooves or the discontinuous grooves at the edge parts. Such as: the small plane of the intermittent groove on the round coin edge (figure 9 c), the small plane of the intermittent groove on the plum blossom coin edge (figure 9 d) and the small plane of the intermittent groove on the arc hexagonal coin edge (figure 9 e). The invisible patterns manufactured in the grooves have the advantage of being not easy to touch and wear. See in particular fig. 9 a-9 e.

Sixth invisible Pattern embodiment

For the invisible patterns which are parallel to the axis diameter of the coin and are made on the arc surface of the periphery of the circular coin, the two sides of the peripheral trapezoidal strip are regularly arranged and engraved to form double-sided invisible patterns in two directions. Because the invisible elements on each trapezoid strip are very tiny and hidden and change along with the cambered surface, the invisible elements are difficult to be found by the naked eyes of the public, so the invisible anti-counterfeiting characteristic pattern is called as a hidden invisible anti-counterfeiting characteristic pattern.

The strokes of the individual elements (e.g., characters, numbers, symbols, etc.) of the hidden covert security feature pattern can be arranged into a single-sided covert pattern 32 (all on one side of the trapezoidal bar) or a double-sided covert pattern 33 (i.e., on both sides of the trapezoidal bar). The strokes of the invisible elements are arranged to be invisible on two sides, namely, the element is half hidden, and the hiding effect is better. Because the hidden invisible pattern is invisible to the naked eye, it can be read, processed and restored by a machine readable identification device.

For example: the invisible pattern manufactured on the arc surface 31 of the circular coin is manufactured, the pattern setting area 5 is manufactured, the peripheral trapezoidal strip 6 is parallel to the axis diameter of the coin, the grooves of the invisible characters TOP are all manufactured on the two sides 32 of the trapezoidal strip, and one group of parallel trapezoidal strips and the parameters of the invisible grooves are as follows: the apex angle (degrees) of the trapezoid (α =98 °), the arc length S =0.21 mm for the trapezoid bar pitch, the height H =0.055 mm for the trapezoid bar, the groove apex angle (degrees) of the invisible pattern (β = α/4=24.5 °, the groove height H =0.05 mm, and the minimum distance N =0.5 mm from the groove to the edge of the trapezoid bar. The trapezoidal upper top surface of the trapezoidal strip of this group parallel arrangement each other keeps parallel with the arcwall face of coin limit portion, and is the evagination setting, and the value that the evagination set up =0.055 millimeter. The grooved structure is shown in figure 5 b.

Because the strokes of each letter element T, O and P are respectively arranged on the two side surfaces of the trapezoid bar, namely, each letter element T, O and P is half hidden, the hiding effect is further improved. See in particular fig. 10.

Seventh invisible Pattern embodiment

The notch of a complete invisible pattern is fragmented, the fragments are distributed in different planes according to rules and coordinates, namely the fragments are distributed on at least more than two different planes of the edge part, and a coordinate system with the same and uniform parameters is established on the different planes of the edge part. The hidden patterns which are fragmented and distributed in different surfaces can be further divided into grooves on one side surface or two side surfaces of the trapezoid strip, and the hidden patterns which are grooved on the two side surfaces hide more concealably.

Because the hidden patterns are fragmented and distributed on different surfaces, only local small fragments can be seen on one surface by naked eyes, and the hidden patterns are just like the whole hidden patterns scattered and hidden on the different surfaces, so the hidden patterns are called hidden anti-counterfeiting characteristic patterns. The hidden invisible pattern can be read and processed by a machine-readable identification device and restored by the hidden pattern.

For example: establishing a rectangular coordinate system at the same positions on four different planes at the edge of the regular hexagon coin according to the same parameters: X-Y (see figure 11 a), the trapezoidal strips (6) on the periphery of the edge part of the coin are all parallel to the axis diameter (4) of the coin, and the notches are all single-side invisible patterns on the same side surface. The invisible pattern "8" is fragmented, divided into four "C" (40) and inscribed on four out-of-plane specific locations. The thickness of the side of the regular hexagon =4 mm, and the size parameters of the invisible character are as follows: the height of the word "8" =2 mm, the width of the word "8" =1.5 mm, the height of the word "C" =1 mm, and the width of the word "C" =0.75 mm. The naked eye observed "C" separately only at different positions on the four faces, while the overall invisible pattern "8" was hidden. See in particular fig. 11 b-11 e.

Invisible pattern reading embodiments

Machine-readable hidden or hidden, single-sided invisible security features may be formed by rotating coins along the axis, arranging pattern recognition devices 41 along the radial direction to read the invisible fragments one by one, and integrating and processing the whole to form a complete element. For machine reading of hidden or hidden double-sided invisible anti-counterfeiting features, a set of pattern recognition devices 41 in opposite directions can be additionally arranged, and two sides of the pattern recognition devices are respectively read one by one and then spliced. The invisible patterns of the trapezoidal strip structure direction which are properly staggered with the axis diameter of the coin are correspondingly inclined.

Example one: taking the sixth invisible pattern embodiment as an example, the invisible character pattern 'TOP' is manufactured on the arc surface 31 of the edge of the round coin, the invisible trapezoidal strip 6 of the invisible character pattern is parallel to the axis diameter of the coin, and the notches of the invisible character pattern 'TOP' are manufactured on the two sides 32 of the trapezoidal strip to form two invisible patterns hidden on the two sides in different directions. The coin can be rotated along the axis, two sets of invisible pattern recognition devices 41 are arranged along the radial direction, fragments of the invisible TOP on both sides are respectively read one by one and are integrated and processed to form a complete TOP character. See fig. 12 a-10 in particular.

Example two: taking the seventh invisible pattern embodiment as an example, the fragments 'C' (40) of the invisible pattern '8' are manufactured at specific positions of four different plane planes at the edge of the regular hexagon coin, and the trapezoidal strips (6) at the edge are all parallel to the axis diameter (4) of the coin, and the engraved grooves are all single-side invisible patterns on the same side. The coin can be rotated along the axial diameter, the pattern recognition device 41 is arranged along the radial direction to read the invisible fragment patterns 'C' 40 on the four different surfaces one by one, and the invisible fragment patterns are integrated and processed to form complete '8' invisible patterns. See fig. 12b, fig. 11 in particular.

The edge of the coin is shot and recorded at high speed through the invisible pattern recognition device, so that the hidden invisible patterns are displayed, the invisible pattern recognition device is the prior art, and specific working principles and structures of the invisible pattern recognition device are not repeated here.

The foregoing is a more detailed description of the invention, taken in conjunction with the accompanying preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described above. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (6)

1. The utility model provides a limit portion has coin and memorial tablet of stealthy pattern which characterized in that: the coin edge of the coin and the memorial tablet is provided with at least one group of invisible pattern setting areas, the invisible pattern setting areas are provided with a group of trapezoidal strips which are arranged in parallel, one side surface or two side surfaces of each trapezoidal strip are provided with continuous or discontinuous grooves, the continuous or discontinuous grooves in one invisible pattern setting area form one invisible pattern, and the contents of the invisible pattern comprise characters, symbols, patterns or numbers.

2. A coin and medal with invisible patterns on the edge part according to claim 1, wherein: the invisible pattern setting area is arranged on a plane or an arc-shaped surface, and the trapezoidal strip and the central shaft of the coin or the memorial tablet are mutually vertical or parallel.

3. A coin and medal with invisible patterns on the edge part according to claim 1, wherein: the invisible pattern setting area is arranged on a plane or an arc-shaped surface, an included angle is formed between the trapezoidal strip and the central shaft of the coin or the memorial tablet, and the included angle is larger than or equal to 0.1 degree and smaller than 180 degrees.

4. A coin and medal with invisible patterns on the edge part according to claim 1, wherein: the invisible pattern setting area is arranged on the plane or the arc-shaped surface of the coin edge, the trapezoidal upper top surface of the trapezoidal strip is parallel to the plane or the arc-shaped surface of the coin edge, the trapezoidal strip protrudes outwards or is kept level with the plane or the arc-shaped surface of the coin edge, the height H of the trapezoidal strip protruding outwards is smaller than or equal to the height H of the trapezoidal strip, and the value of the H is within the range of 0.04 mm to 0.1 mm.

5. A coin and medal with invisible patterns on the edge part according to claim 1, wherein: the invisible pattern setting area is arranged on the plane of the coin edge, and for the invisible patterns arranged on the plane of the coin edge: the height value H of the trapezoid strips is 0.04 mm to 0.1 mm, the cone vertex angle alpha of each trapezoid strip is 90 degrees to 120 degrees, the distance L between every two adjacent trapezoid strips is 0.17 mm to 0.34 mm, the notch on each trapezoid strip is provided with a notch vertex angle, the notch vertex angle beta is equal to one fourth of alpha, the notch height H is smaller than or equal to the height H of each trapezoid strip, and the distance M from the notch to the edge of each trapezoid strip is larger than or equal to 0.1 mm.

6. A coin and medal with invisible patterns on the edge part according to claim 1, wherein: the invisible pattern setting area is arranged on the arc-shaped surface of the edge of the coin, and the invisible patterns on the arc-shaped surface of the edge of the coin are arranged: the height H of the trapezoid strips is 0.04 mm to 0.1 mm, the cone vertex angle alpha of the trapezoid strips is 90 degrees to 120 degrees, the arc length distance S or the distance L between the trapezoid strips is 0.16 mm to 0.35 mm, the notch grooves on the trapezoid strips are provided with notch groove vertex angles, the notch groove vertex angle beta is equal to one fourth of alpha, the notch groove height H is smaller than or equal to the height H of the trapezoid strips, and the distance N from the notch grooves to the edges of the trapezoid strips is larger than or equal to 0.1 mm.

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