Optical effect layers showing a viewing angle dependent optical effect, processes and devices for their production, items carrying an optical effect layer, and uses thereof

Patent metadata

Field	Value
Publication number	US-10682877-B2
Application number	US-201715703063-A
Country	US
Kind code	B2
Filing date	Sep 13, 2017
Priority date	Jan 9, 2013
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

Magnetic field-generating device including a plurality of elements selected from magnets and pole pieces and including at least one magnet. Plurality of elements are (i) located below supporting surface or space configured to receive a substrate acting as supporting surface or (ii) forming a supporting surface, and are configured to provide a magnetic field with magnetic field lines running substantially parallel to supporting surface or space in two or more areas above supporting surface or space. Two or more areas form nested loop-shaped areas surrounding a central area; and/or the plurality of elements include a plurality of magnets, which are rotatable around an axis of rotation such that areas with field lines running substantially parallel to supporting surface or space combine upon rotation around axis of rotation, thereby forming, upon rotation around axis of rotation, a plurality of nested loop-shaped areas surrounding one central area.

First claim

What is claimed:

1. A magnetic field-generating device comprising a plurality of elements selected from magnets and pole pieces and comprising at least one magnet, the plurality of elements being either (i) located below a supporting surface or a space configured to receive a substrate acting as supporting surface or (ii) forming a supporting surface, and being configured such as to be capable of providing a magnetic field wherein magnetic field lines run substantially parallel to said supporting surface or space in two or more areas above said supporting surface or space, and wherein
i) the two or more areas form nested loop-shaped areas surrounding a central area; and/or
ii) the plurality of elements comprise a plurality of magnets, and the magnets are arranged rotatable around an axis of rotation such that the areas with field lines running substantially parallel to the supporting surface or space combine upon rotation around the axis of rotation, thereby forming, upon rotation around the axis of rotation, a plurality of nested loop-shaped areas surrounding one central area.

2. The magnetic field-generating device according to claim 1 , option ii), wherein the magnets are arranged such that in an area; which is above said supporting surface or space and which is centered on the axis of rotation, a magnetic field with field lines running substantially parallel to the plane of magnets is generated.

3. The magnetic field-generating device according to claim 1 , option i), wherein the two or more areas of parallel field lines; which form the nested loop-shaped areas surrounding a central area, are caused by an arrangement of a plurality of elements selected from magnets and pole pieces, at least one of said elements having a loop-shaped form corresponding to the loop-shaped area with parallel field lines above the supporting surface or space.

4. The magnetic field-generating device according to claim 3 , wherein the arrangement of a plurality of elements selected from magnets and pole pieces comprises at least one loop-shaped magnet having its magnetic axis substantially perpendicular to said supporting surface or space, which arrangement further contains a pole piece having a loop-shaped form, the loop-shaped magnet and the looped shaped pole piece surrounding a central area in a nested manner.

5. The magnetic-field-generating device according to claim 4 , wherein the central area comprises a bar dipole magnet having its magnetic axis substantially perpendicular to said supporting surface or space or a central pole piece, and wherein the pole piece and that magnet are arranged in alternating manner starting from the central area.

6. The magnetic field-generating device according to claim 1 , option ii), wherein the plurality of magnets are arranged symmetrically around the axis of rotation and have their magnetic axis substantially parallel or substantially perpendicular to the supporting surface or space.

7. The magnetic-field-generating device according to claim 1 , which is selected from the group consisting of the following:
a) a magnetic-field-generating device, wherein a loop-shaped axially magnetized dipole magnet is provided such that the North-South axis is perpendicular to the supporting surface or space, wherein the loop-shaped magnet surrounds a central area, and the device further comprises a pole piece that is provided below the loop-shaped axially magnetized dipole magnet with respect to the supporting surface or the space and that closes one side of the loop formed by the loop-shaped magnet, and wherein the pole piece forms one or more projections extending into the space surrounded by the loop-shaped magnet and being spaced apart therefrom, wherein
a1) the pole piece forms one projection that extends into the central area surrounded by the loop-shaped magnet, wherein the projection is laterally spaced apart from the loop-shaped magnet and fills a part of the central area;
a2) the pole piece forms one loop-shaped projection and surrounds a central bar dipole magnet having the same North-South direction as the loop-shaped magnet, the projection and the bar dipole magnet being spaced apart from each other, or
a3) the pole piece forms two or more spaced-apart projections, either all of these or all but one of these are loop-shaped, and, depending on the number of projections, one or more additional axially magnetized loop shaped magnets having the same North South direction as the first axially magnetized loop-shaped magnet is/are provided in the space formed between the spaced-apart loop-shaped projections, the additional magnets being spaced apart from the loop-shaped projections; and wherein the central area surrounded by the loop-shaped projections and the loop-shaped magnets is partly filled with either a central bar dipole magnet having the same North-South direction as the surrounding loop-shaped magnets or with a central projection of the pole piece, such that, as viewed from the supporting surface or the space, an alternating arrangement of spaced-apart loop-shaped pole piece projections and loop-shaped axially magnetized dipole magnets is formed, surrounding one central area, wherein the central area is filled either with a bar dipole magnet or a central projection as set out above;
b) a magnetic-field-generating device, comprising two or more bar dipole magnets and two or more pole pieces, wherein
the device comprises an equal number of pole pieces and bar dipole magnets, wherein the bar dipole magnets have their North-South axis substantially perpendicular to the supporting surface or space, have the same North-South direction and are provided in different distances from the supporting surface or space, along one line extending perpendicular from the supporting surface or space, and spaced apart from each other; and
the pole pieces being provided in the space between the bar dipole magnets and in contact therewith, wherein the pole pieces form one or more projections which, in loop-shaped form, surrounds a central area in which the bar dipole magnet located next to the supporting surface or space is located;
c) a magnetic-field-generating device, comprising one bar dipole magnet located below the supporting surface or space and having its North-South direction perpendicular to said supporting surface or space,
one or more loop-shaped pole pieces arranged above the magnet and below the supporting surface or space, which, for a plurality of loop-shaped pole pieces, are arranged spaced apart and coplanar nested, the one or more pole pieces laterally surrounding a central area under which the magnet is located,
the device further comprising a first plate-like pole piece having about the same size and about the same outer peripheral shape as the outermost loop-shaped pole piece, the plate-like pole piece being arranged below the magnet such that its outer peripheral shape is superimposed with the periphery of outermost of the loop-shaped pole pieces in direction from the supporting surface or space, and which is in contact with one of the poles of the magnet; and a central pole piece in contact with the respectively other pole of the magnet, the central pole piece having the outer peripheral shape of a loop, partly filling the central area and being laterally and spaced apart from and surrounded by the one or more loop-shaped pole pieces;
d) a magnetic-field-generating device according to item c) above, wherein a second plate like pole piece having the outer peripheral shape of a loop is provided at a position above and in contact with one pole of the magnet and below and in contact with the one or more loop-shaped pole pieces and below and in contact with the central pole piece, so that the central pole piece is no longer in direct contact with the pole of the magn

Assignees

• Sicpa Holding Sa

Inventors

• Schmid Mathieu
• Loginov Evgeny
• Despland Claude Alain
• Degott Pierre

Classifications

• B05D3/20 Primary

  by magnetic fields · CPC title

• B42D2035/20

  Operations & Transport · mapped topic

• B42D2033/20

  Operations & Transport · mapped topic

• B42D2033/16

  Operations & Transport · mapped topic

• G03G15/08

  using a solid developer, e.g. powder developer · CPC title