NZ623924B2 - Object comprising a region of its surface suitable for showing a plurality of images - Google Patents
Object comprising a region of its surface suitable for showing a plurality of images Download PDFInfo
- Publication number
- NZ623924B2 NZ623924B2 NZ623924A NZ62392412A NZ623924B2 NZ 623924 B2 NZ623924 B2 NZ 623924B2 NZ 623924 A NZ623924 A NZ 623924A NZ 62392412 A NZ62392412 A NZ 62392412A NZ 623924 B2 NZ623924 B2 NZ 623924B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- light level
- facets
- image
- different
- cavities
- Prior art date
Links
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000000295 complement Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004663 powder metallurgy Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 description 10
- 238000009826 distribution Methods 0.000 description 7
- 210000000887 Face Anatomy 0.000 description 6
- 230000000875 corresponding Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 2
- 230000000750 progressive Effects 0.000 description 2
- 210000001217 Buttocks Anatomy 0.000 description 1
- 235000012571 Ficus glomerata Nutrition 0.000 description 1
- 240000000365 Ficus racemosa Species 0.000 description 1
- 101700015817 LAT2 Proteins 0.000 description 1
- 235000015125 Sterculia urens Nutrition 0.000 description 1
- 229940035295 Ting Drugs 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 238000010147 laser engraving Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C21/00—Coins; Emergency money; Beer or gambling coins or tokens, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/361—Removing material for deburring or mechanical trimming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/29—Securities; Bank notes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/324—Reliefs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/425—Marking by deformation, e.g. embossing
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/122—Reflex reflectors cube corner, trihedral or triple reflector type
- G02B5/124—Reflex reflectors cube corner, trihedral or triple reflector type plural reflecting elements forming part of a unitary plate or sheet
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/02—Other than completely through work thickness
Abstract
object (1) comprising a region (R) of its surface suitable for showing a plurality of images each observable from a different direction such that upon observing one of the images the other images stop being visible. The region comprises a plurality of cavities (1.1) in low relief regularly distributed on the surface of the region (R), each of the cavities (1.1) shows a plurality of side facets 10 (1.1.1, 1.1. 2, 1.1. 3), at least one facet per image, where each facet (1.1.1, 1.1.2, 1.1.3) is associated with either a first light level or a light level different from the first. The configuration allows for mass production by means of stamping or minting techniques and complicates the reproduction by unauthorized manufacturers. A method for producing a stamp for the production and a method for production is also included. buted on the surface of the region (R), each of the cavities (1.1) shows a plurality of side facets 10 (1.1.1, 1.1. 2, 1.1. 3), at least one facet per image, where each facet (1.1.1, 1.1.2, 1.1.3) is associated with either a first light level or a light level different from the first. The configuration allows for mass production by means of stamping or minting techniques and complicates the reproduction by unauthorized manufacturers. A method for producing a stamp for the production and a method for production is also included.
Description
W0 2013/072449
OBJECT COMPRISING A REGION OF ITS SURFACE SUITABLE FOR SHOWING A
____________.fi______________mfl_______________*w_____________
PLURALITY OF IMAGES
Object of the Invention
The t invention relates to an object comprising a
region of its surface suitable for showing a plurality of
. Each of these images is observable fronl a different
direction such that upon observing one of the images the other
images stop being observable and do not interfere in the viewing
of the observed image.
The configuration which allows generating' the region of
surfaces suitable for showing the plurality of images allows for
the mass production by means of stamping or minting techniques
and complicates the reproduction by unauthorized manufacturers.
A method which allows obtaining the object having a region
suitable for showing a plurality of images is also an object of
the present invention.
An embodiment of the ion particularly has a region
suitable for showing a plurality of images where the change in
inclination of the observer with respect to the e where
the image is d generates a brightness band which moves as
the observer changes r inclination, this effect also being
independent from that produced in the other images.
Background of the Invention
There are various solutions for printing images by making
use of inks or by means of laser engraving techniques which
allow generating holographic images. The production cost of
techniques of this type and the materials required make their
use in coin minting or their incorporation into objects ed
for example by stamping unviable.
Spanish patent with publication number E82042423 which
describes a method for obtaining dual image engravings on rigid
surfaces is known. This patent works with surfaces having
grooves with different inclinations for generating . The
use of s allows easily producing this type of engravings;
2012/072809
however, this easy production also tates the reproduction
by third parties from a piece thus engraved.
The present invention has a surface capable of reproducing
a plurality of images such that it dously complicates
making a copy starting from a genuine object incorporating these
images.
Description of the Invention
A first aspect of the invention is an object comprising a
region of its surface suitable for g a plurality of images
such that each image is observable by a user from a direction
with a different orientation. The invention establishes a
configuration of this region such that when the user observes
the region from one direction he/she ves an image, or part
of the image, but not the rest of the . To e the
rest of the images the user must change his/her ation
orientation with respect to the same region. The region showing
a plurality of images is preferably flat, however, the invention
also allows viewing the plurality of images on surfaces with a
certain curve. In these cases the image may not be seen in its
entirety from the same orientation and requires slight changes
in orientation to perceive the entire image.
The region showing a plurality of images comprises:
0 A plurality of cavities in low relief regularly distributed
on the surface of the region.
The special configuration of the cavities allows viewing
different images according to the observation orientation.
The use of low relief complicates the production when an
object produced in accordance with the invention is provided;
however it can be produced at a low cost by means of stamping
techniques starting, for example, from a laser—carved punch.
0 Each of the cavities shows a plurality of side facets, at
least one facet per image, where each facet is associated
with either a first light level or a light level different
from the first.
The invention establishes a first light level and one or more
different light levels. The simplest particular embodiment
makes use of two light levels, however, in the embodiments
there is described a ular embodiment which allows
generating shifting effects when the observer progressively
changes the inclination of his/her observation point of one
of the images based on the use of an appropriately selected
range of light levels.
Each cavity is formed by a plurality of facets, facet being
understood as a flat region of the cavity and therefore has
essentially the same reflection. Each cavity has one facet
per image. Each image is thus constructed imposing conditions
on the facets which are associated with said image t
such conditions ing the g' of the rest of the
images, and therefore the facets associated with other such
images.
0 The facets which determine an image and are associated with
the first light level have the same orientation and
inclination with respect to the surface where the cavity is
located; and this orientation is different from the
orientation of the facets of another ent image.
This is how each of the images is generated. At least two
light levels are used. Each facet of those which determine an
image of the cavity serves as a pixel of the image and is
e of showing at least two light levels. These light
levels are independent from those shown by the same cavity
due to the ation which allows observing another
different image.
A distinction is made between orientation and inclination.
Orientation is the direction normal to the e of a
facet. Throughout the description, inclination refers to the
angle formed between a facet and the surface on which the
cavity is located. tually, the main surface is what
would correspond if there were no cavities. The inclination
of’ a facet is not the orientation of said facet although
varying the inclination means varying the orientation.
Different particular cases which also solve different
W0 2013/072449
technical ms are bed in the detailed description of
the invention.
A second aspect of the invention is a method for generating
a surface in a region of an object suitable for showing a
plurality of images such that each image is able by a user
from a different direction.
The method comprises at least two steps:
0 establishing' a configuration of the surface formed by a
plurality of cavities ing to any of the embodiments, or
the complementary thereof,
0 ng out a laser g process on the surface according
to the established configuration.
The method plates generating a e, either
directly observable or with the complementary configuration,
according to the first aspect of the invention. In this second
case the object obtained can in turn result in producing
multiple surfaces. This is the case of cturing a punch.
A configuration of the surface can be established according
to the first inventive aspect, for example, by means of a model
which can be depicted by a computer and be transferred to a
machine capable of generating surfaces according to the
definition of said model.
Laser carving of the surface according to the established
configuration results in a surface which allows multiple
transfers, for example, by means of subsequent stamping and/or
minting operations.
It has been seen that the use of powder metallurgy steels
is especially suitable for producing objects which, by stamping,
generate objects having a plurality of images according to the
first aspect of the invention which are the accurate
reproduction of the original computer~generated definition.
Description of the Drawings
The ing' and other features and advantages of the
invention will be better understood from the following detailed
description of a preferred embodiment, provided only as a non-
2012/072809
ng illustrative example, in reference to the attached
drawings.
Figure 1 shows an embodiment where the object comprising a
region with a surface suitable for g a plurality of images
is a coin.
Figures 2a, 2b and 2c show three different embodiments of
cavity configurations, by means of triangular-, square— and
hexagonal~based pyramids.
Figure 3 shows a plan view of two cavities as well as a
section perpendicular to the main e located in the center
line of the plan View. Arrows which allow describing the light
changes of the facets according to their inclination are shown
on the section.
Figure 4 shows a perspective view of four particular cases
of cavities depicting images.
Figure 5 schematically shows an embodiment where an area of
the region where the plurality of images is located shows an
effect of the ssive change in brightness for one of the
images due to minor changes in orientation of the observer.
Figure 6 shows the schematic depiction of a region on which
four superimposed images have been defined.
Figure 7 shows an enlarged view of an image in perspective
view of a region with cavities ing to one embodiment.
ed Description of the Invention
A first aspect of the invention is an object comprising a
region (R) of its surface suitable for showing a plurality of
images. In a first embodiment this object is a coin (l) in which
the region (R) suitable for showing a plurality of images is
located in at least one of its faces.
This region (R) comprises a plurality of low relief
cavities (1.1) distributed regularly in said region (R). Figures
2a, 2b and 2c show different embodiments where the cavities are
pyramids such that their base coincides with the main surface of
the face of the coin (1); and the triangular faces thereof are
set inwards such that the apex is located under the main
e. In another embodiment the pyramids are truncated and
therefore have no apex.
Figure 2a shows a regular distribution of triangular~based
pyramids, Figure 2b shows a r distribution of square—based
pyramids, and Figure 2c shows a regular distribution of
hexagonal-based pyramids. In order to dedicate the entire
surface to the reflection as part of one of the images, the
regular distribution is such that the entire available surface
area is d; however, a certain separation distance could
exist between each of the es. These drawings have also
only shown a few cavities; however, it is understood that the
surface of the region (R) is covered 'by the repetition of a
specific pattern. This pattern is different according‘ to the
polygonal uration of the pyramid base. The use of square—
based pyramids, for example, results in a distribution in rows
and s according to a ian structure; however, the use
of hexagonal bases results in three main directions (which will
result in 6 possible images) considering the projection on the
main plane ding with the face of the coin (1).
In this embodiment where the es (1.1) are polygonal-
based pyramids, each of the faces of the pyramid is associated
with a different image. These faces of the pyramid are facets
(1.1.1, 1.1.2, 1.1.3, 1.1.4). The facets therefore are flat
sectors, in this particular case the faces of the ds, each
of them associated with an image.
Figure 3 shows two cavities (1.1) in plan view where the
cavities correspond to a configuration in the form of a square-
based pyramid. The square base at the outer mouth of the cavity
(1.1) and the side walls of the pyramid correspond to the facets
(1.1.1, 1.1.2, 1.1.3, 1.1.4). Since the pyramid. is a square—
based pyramid and has 4 faces, a region made up of this type of
cavities (1.1) is capable of showing 4 images.
In this embodiment two light levels, a first light level
and a second light level, are used. In this same Figure 3, in
the upper part of the plan view of the two cavities, a section
is shown according to a plane perpendicular to the main surface
W0 20131072449 PCT/EP20121072809
contained in the bases of the pyramids and passing through the
two apexes of the es.
Considering the cavity (1.1) shown on the left, each of the
facets of said cavity has a different normal direction. In this
case there are four different orientations. The orientation
shown by the four facets of the cavity on the left corresponds
to a first light level and it is the level associated with the
inclination of the facet if it is the one which corresponds to
the r pyramid.
The eye of an observer receiving the light reflected from
an incident beam on the first side facet (1.1.1) of the cavity
(1.1) is schematically shown in the section. With this
orientation of the region (R) with respect to the er, the
eye of this observer will not receive the light ted from
any of the remaining side facets (1.1.2, 1.1.3, 1.1.4).
The cavity (1.1) shown on the right shows a first side
facet (1.1.1) the inclination of which has been increased. The
inclination has been increased. by means of a rotation with
respect to the edge d between the main e and the
side facet (1.1.1). In this case this edge also coincides with
the edge ing from the intersection between the base of the
d and the first side facet (1.1.1).
In this embodiment the increase in the inclination of the
first side facet (1.1.1) results in the appearance of three
sectors (B1, B2, B3) having additional flat surfaces serving as
the connecting surfaces between the first side facet (1.1.1) and
its adjacent side facets (1.1.2, 1.1.4), particularly, one
sector having a triangular surface (Bl) at the bottom parallel
to the base or the main surface, and two sectors having oblique
triangular side surfaces. This way of connecting the first side
facet (1.1.1), with the increased inclination and therefore
associated with a second light level, and the side facets is not
the only one. Other ways for connecting adjacent side facets
will be described in other embodiments.
On this same configuration, in the section corresponding to
this cavity (1.1) shown on the right in Figure 3, it is observed
W0 2013/072449
that for an observer d in the same position as the
observer schematically shown in the cavity on the left, and, for
an incident light beam which also comes from the same direction,
the reflected light does not reach the observer rather, in this
embodiment, it s the base (B1).
In one embodiment, the base (Bl) has been made according to
a mottled surface ting the incident light to a lesser
degree to entiate to a greater degree the ence
between the first light level and the second light level.
However, it is le for the incident beam to end up in
the direction where the observer is, but this last direction of
reflection is the result of more reflections on several surfaces
of the same cavity (1.1). In this case, since each reflection
will change the light level, the user will also perceive this
change and therefore the image. The greater the difference
between the first light level and the second light level, the
greater the contrast of the reproduced image.
Continuing with an embodiment and using the particular case
of square—based pyramids to describe the invention in detail,
since each side facet (1.1.1, 1.1.2, 1.1.3, 1.1.4) is capable of
reproducing a different image, in this particular case 4, it is
necessary to determine how to assign the light level in each
cavity and in each facet to configure the region (R) resulting
in a e which allows g the 4 images.
In this embodiment, 4 different images are chosen: a first
image showing a letter “M”, a second image showing a number, a
third. image showing a circle and a fourth image showing a
symbol.
These images can, for example, be depicted in black and
white. Like a black and white digital image, pixels illuminated
in white and others in black resulting in two disconnected
regions would be distinguished, in this case each cavity (1.l)
(actually a facet of said cavity) will perform the function of a
pixel and will also be assigned a first light level or a second
light level. The first light level, for example, corresponds to
the color white and the second light level corresponds to black.
W0 2013/072449
Since each cavity (1.1) has four side facets , 1.1.2,
1.1.3, 1.1.4), the first image will establish in each cavity the
inclination that will be adopted by the first side facet
(1.1.1), either that shown on the left in Figure 3 or that shown
on the right in Figure 3, incorporating additional surfaces (Bl,
B2, B3).
It is possible to do the opposite by interchanging the
inclination of the side facets associated with either light
level.
Figure 4 shows a perspective view of a sequence of 4
different cavities. The cavity sh0wn on the left is an inverted
pyramid having four facets (1.1.1, 1.1.2, 1.1.3, 1.1.4) with the
same inclination. This case corresponds to the situation in
which the four images e showing the first light level in
said cavity.
The second cavity starting from the left is a cavity in
which the image associated with the facet (1.1.4) located in the
upper part (with respect to the orientation of the sheet of the
drawing) requires a second light level by sing its
inclination. Close to the apex there are three onal
triangular surfaces which are in transition between this side
facet (1.1.4) and the rest of the side facets (1.1.1, 1.1.2,
1.1.3) and particularly the base (B1) of the bottom. This
configuration of the side facet (1.1.4) with increased
inclination does not affect the light level which the rest of
the side facets associated with the other 3 images continue to
show.
The third cavity starting from the left is a cavity in
which two images impose an increased degree of inclination on
the upper side facet (1.1.4) and right side facet (1.1.3) (with
respect to the orientation of the sheet of the drawing) to show
a second light level; and the remaining third and fourth images
require in this same cavity (1.1) a first light level and
therefore do not e increasing the ation of the
facets located on the left (1.1.1) and below (1.1.2) (also with
respect to the orientation of the sheet of the drawing). In this
_ 10 _
particular case the number of transition es has been
reduced by establishing a e at the bottom (Bl) common to
the upper facet (1.1.4) and right facet (1.1.3) and only one
transition surface with the surfaces the inclination of which
has not been modified has been added.
The technical effect of identifying the adjacent side
facets the inclination of which has been increased to eliminate
interface surfaces leaving a common bottom is the elimination of
edges in the cavity (1.1) to depict the same light levels. The
reduction of edges in an image is very important because a laser
carving—based production process requires transferring the
configuration of the surface by means of computer processes and
the volume of information to be managed is proportional to the
number of edges and apexes. Although the resolution of an image
is proportional to the number of cavities (1.1) and it can be
high, the number of edges entails several images and entails a
very large volume of information which can even result in the
tion of the laser device ment systems.
It has already been mentioned that the light levels
different from the first light level can be obtained by
assigning an increased inclination to the side facets ,
1.1.2, 1.1.3, 1.1.4). In the embodiments described, this
increased inclination is the same in all the cavities (1.1).
In one ment, this inclination different from that of
the facets (1.1.1, 1.1.2, 1.1.3, 1.1.4) associated with the
first light level is selected in a specific manner.
Figure 5 shows a rectangular region (R) on which low relief
square—based cavities (1.1) have been arranged distributed in
rows and s. A subset of cavities forming a pattern (P) has
been fied from this set of cavities (1.1). This pattern
(P), which for the sake of city is also rectangular,
could, for example, show an image different from the four images
shown by the region (R) and particularly different from the
image associated with the side facets arranged in the upper part
of this figure and associated with the first image.
According to this embodiment, the pattern (P) will
1.11_
ish a subset of cavities in which the upper side facet
(1.1.1), highlighted in black in Figure 5, if according to the
first image must show a light level different from the first
light level, then the degree of inclination of the upper side
facets (1.1.1) is determined according to a pre—established
function.
The right side of the figure shows a function the
nates of which are the position along a direction
perpendicular to a distribution in rows of the cavities (1.1)
located in the rectangular area of the pattern (P) and the
abscissas the value of the function. In this case the value of
the abscissas has been identified as “L” related to the degree
of inclination and therefore to the light.
This function, taken at the points corresponding' to the
position of a specific row, establish the ation adopted by
the side facets (1.1.1) of that row when the image associated
with said side facets establishes that the light level is
different from the first light level.
Figure 5 shows with broken lines the site where the
te values of the X coordinate have been taken in order to
take the value of the function corresponding to said coordinate.
The value of the discretized function is shown with black
circles on the continuous curve of the on.
In this case, the conditions that the cavities of the
region (R) must verify are:
0 The cavities (1.1) are distributed in rows parallel to an
edge or a side of the base of the cavity (1.1).
In this case the rows are considered ntal and therefore
parallel to the upper edge or side of the base of the cavity
(1.1). If, for example, the cavities were hexagonal-based
es as shown in Figure 2c then the distribution in rows
could be horizontal or also according to two oblique lines
coinciding with the orientation imposed by the edges or sides
of the bases of the hexagonal pyramids.
o For a plurality of rows parallel to an edge or a side of the
base of the cavity (1.1), at least the facets of a set of
WO 72449
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cavities of one and the same row having an inclination
associated with a second light level different from the first
light level have the same inclination.
The set of es of one and the same row having an
inclination associated with a second light level different
from the first light level is the set identified by means of
the pattern (P). The possibility of ing a subset of
cavities in one and the same row allows ing a
brightness effect that can be shifted with the user’s
progressive change in orientation where this brightness
effect can in turn have a form different from that of the
image viewed by the user. The ion of this subset of
cavities determines the form of this different image.
I The inclination of the set of es with the same
inclination belonging to the different rows varies
progressively from row to row and along all the rows.
A simple way of depicting the progressive row‘to—row
variation of the inclination of the cavities having the same
inclination —and not the only one— is the use of the function
depicted on the right of Figure 5.
The function’s behavior changes the way of varying the
brightness shifting effect when the user changes his/her
orientation.
In the example shown in Figure 5, the pattern (P) is
gular and the function is a continuous function. The user
views a bright band in those rows close to the orientation in
which he/she directly perceives the reflected beams. The rows
further‘ away from these rows have a different angle and are
ore darker. If the user slightly changes the inclination
of the object, the direction where the reflected beams are
directly perceived (where the user observes the brightness) will
correspond to the rows located progressively above or below the
preceding row. The resulting effect while the object moves is
the effect where the bright band shifts according to the change
in orientation of the object.
Each of the images, there can be up to four images in this
-13_
embodiment, can have associated ith its pattern and
inclination variation on also independently resulting in
the brightness variation .
To prevent the pixelated effect and to improve the
definition of the depicted images, the characteristic size of
the cavities (1.1) must be the smallest le. Tests have
been carried out with prototypes and it has been found that the
result is very good when using square~based pyramids with
dimensions of the side of the base between 0.1 and 0.3 mm,
preferably between 0.15 and 0.20 mm and more preferably 0.16 mm,
and a depth of the apex of the pyramid between 0.04 and 0.08 mm,
preferably 0.06 mm.
For these dimensions, using milling processes would not
produce correct results since rounded edges and planes with
fuzzy borders would. be obtained, reducing the sharpness and
contrast of the depicted images.
A production mode suitable for ing an object
incorporating a region (R) suitable for showing a ity of
images with such restrictive conditions uses laser equipment on
a steel block of those used in cold working tools. The laser
used has approximate characteristics of pulse time in
nanoseconds and a beam diameter of 10 to 15 um.
Carving by means of a pulsed laser beam can be carried out
directly on the final piece, but if l pieces need to be
carved, it is preferably transferred by means of press tamping
to an intermediate part or die where it will be inverted, with
high relief pyramids, and subsequently to the final piece, where
it will be defined with the same configuration as the original
obtained by the laser.
The tamping tests conducted. have been satisfactory, the
original optical effect being maintained in the final piece.
The production process has been tested for coin and medal
minting processes.
By way of example, Figure 6 schematically shows a region
(R) demarcated above and below by two arched side sectors and
two ht sectors. The use of the terms sides, above and
_14_
below must be interpreted according to the orientation of the
drawing. In this embodiment, this region (R) is part of the area
of a face of a coin. Four images are shown in this region (R),
each able to be viewed from a different orientation, which are
superimposed in the projection shown in Figure 6. The user
observing' the region (R) will observe an image if he/she is
located on the right, another image if he/she is located on the
left, another image if he/she is located above and another image
if he/she is located below, and the user must always be located
a certain distance from the surface.
According to one embodiment, the region (R) has been
d with square—based pyramid—shaped es when none of
the images assigns a light level different from the first light
level. Figure 6 is said to be a schematic figure because those
cavities (1.1) in which all the side facets (1.1.1, 1.1.2,
1.1.3, 1.1.4) are ed a first light level is depicted
therein with a square. Actually the projection of a low relief
inverted pyramid would also show the two diagonals, but this
schematic depiction intends to indicate which facets (1.1.1,
1.1.2, 1.1.3, 1.1.4) are shown with a light level different from
the first light level. These facets (1.1.1, 1.1.2, 1.1.3, 1.1.4)
are those fied with a triangle. If the triangle has its
t side upwards inside the square base it must be
interpreted that that facet has an inclination different from
that which it adopts when it has a first light level.
According to this schematic depiction, each image only
s one type of triangle: the one having the larger base
above, below at either side. A square will have zero, one, two,
three or four triangles where each site associated with a facet
will have a second light level if a triangle is depicted.
Figure 7 shows an ed detail of an image of the region
(R) with the cavities which have been obtained after applying
the motif with four images. In this case, the increased slope in
those facets which must show a second light level results in a
triangle in the base parallel to the base of the cavity (1.1).
_15_
Claims (18)
1. An object comprising a region (R) of its surface suitable for showing a pdurality of images such that each image is observable by a user from a different direction, wherein this region (R) is flat and comprises: 0 a plurality of cavities in low relief rly distributed on the surface of the region (R); 0 each of the cavities shows a plurality of side facets, at 10 least one facet per image, where each facet is associated with either a first light level or a light level different from the first; 0 the facets which determine an image and are ated with the first light level have the same orientation and 15 ation with respect to the surface where the cavity is located; and this orientation is different from the orientation of the facets of another different image.
2. The object according to claim 1, wherein the facets which determine each image and are associated with a light 20 level different from the first have a different inclination with respect to the surface where the cavity is located.
3. The object according to claim 1, wherein the facets which determine each image and are associated with a light level different from the first have a different texture 25 ing in a degree of reflection different from that of the facets ated with a first light level.
4. The object according to claim 1, n the facets which determine each image and are associated with a light level different from the first have at least one transition 30 surface for connecting with the adjacent facets of the same cavity.
5. The object according to claim J. or 4, wherein the cavities in low relief are formed by facets such that if these facets are associated with the first light level, they 35 correspond with the face of a pyramid the base of which is ~16— located on the surface of the region (R) and its apex under said surface.
6. The object according to claim 5, wherein: o the cavities are distributed in rows parallel to an edge or side of the base of the cavity, 0 for a plurality of rows parallel to an edge or side of the base of the cavity, at least the facets of a set of es of one and. the same row .having an inclination associated with a second light level different from the 10 first light level have the same inclination; and, o the inclination of the set of cavities with the same ation belonging to the ent rows varies progressively from row to row and along all the rows.
7. The object according to claim 6, wherein the cluster 15 formed by the sets of cavities which share the same inclination per row and are associated with the second light level determine a pattern or second image.
8. The object according to any one of claims 5 to 7, wherein the base of the pyramid is polygonal and wherein the 20 cavities are distributed such that the bases of the pyramids fit together covering the entire surface of the region.
9. The object ing to any one of claims 5 to 7, n the base of the pyramid is square.
10. The object according to claims 8 and 4, wherein the 25 facets with the greatest inclination associated with a light level different from the first light level have a side common with the base of the pyramid and comprise at least one transition surface with the apex of the pyramid.
11. The object according to claim 10, wherein the 30 tion surface adjacent to the apex of the pyramid has a degree of reflection different from that of the facet with the greatest inclination of which it is a transition surface.
12. The object according to claim 10, n the transition surface adjacent to the apex of the pyramid is flat 35 and parallel to the base of the pyramid. -17...
13. The object according to claim 12, wherein n two adjacent facets associated with different images having a degree of inclination greater than that associated with the first light level a corner transition is established by extending the facets with the greatest inclination and the es parallel to the base adjacent to the apex.
14. A punch comprising a surface complementary to the surface of the region (R) of an object according to any one of claims 1 to 13 intended for generating by pressure said 10 surface suitable for showing the plurality of images.
15. A method for generating a surface in a region of an object suitable for showing a plurality of images such that each image is observable by a user from a ent direction, wherein it ses: 15 0 establishing‘ a configuration. of the e formed. by a plurality of cavities according to any one of claims 1 to 14 or the complementary f, 0 carrying out a laser carving process on the surface ing to the established configuration. 20
16. The method according to claim 15, wherein the object on which the laser carving is carried out is a powder metallurgy steel.
17. The method according to claim 15 or 16, wherein the object on which the laser carving is carried out is a punch, 25 the uration of the surface is the complementary configuration; and said punch is used to generate by pressure the surface suitable for showing a plurality of images in a second object.
18. The method according to claim 15, wherein the image 30 to be depicted is transformed into an image containing two intensity levels.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11382355.3 | 2011-11-18 | ||
EP20110382355 EP2594149A1 (en) | 2011-11-18 | 2011-11-18 | Object comprising a region of its surface suitable for showing a plurality of images |
PCT/EP2012/072809 WO2013072449A1 (en) | 2011-11-18 | 2012-11-16 | Object comprising a region of its surface suitable for showing a plurality of images |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ623924A NZ623924A (en) | 2015-08-28 |
NZ623924B2 true NZ623924B2 (en) | 2015-12-01 |
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