US5712731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security device for security documents such as bank notes and credit cards
Assignee: De la Rue International Ltd
•
Filing: 1994-05-10
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Granted: 1998-01-27
•
Expires: 2014-05-10
Abstract
Abstract A security device includes an array of microimages which, when viewed through a corresponding array of substantially spherical microlenses, generates a magnified image. In some cases, the array of microlenses is bonded to the array of microimages.
Inventors
- 👤 Kenneth J. Drinkwater
- 👤 Philip M. G. Hudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:22
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/0005; G03H1/0011; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/188; G02B5/1885; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; G06K19/16; G02B3/00; G02B3/0006; G02B3/0037; G02B3/0056; G02B3/0075; G03H1/02; G03H1/024; G03H1/0244; G03H1/22; G03H1/2202; G03H1/2205; G03H2001/221; G03H2210/00; G03H2210/50; G03H2210/55; G03H2223/00; G03H2223/19
Claims Analysis
Total Claims: 57
Claim 1
Independent Claim
88 words
A security device comprising a regular two dimensional array of substantially identical printed microimages, each of the microimages having a dimension of up to about 250 μm and which, when viewed through a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each microlens having a diameter in the range of substantially 50-250 μm, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 2
Dependent Claim
88 words
A security device comprising a regular two dimensional array of substantially identical printed microimages, each of the microimages having a dimension of up to about 250 μm and which, when viewed through a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each microlens having a diameter in the range of substantially 50-250 μm, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 3
Dependent Claim
15 words
A security device according to claim 1, wherein the microimages have been printed with ink.
Claim 4
Dependent Claim
16 words
A security device according to claim 2, wherein the microimages have been lithographically or intaglio printed.
Claim 5
Dependent Claim
74 words
A security device according to claim 1, further comprising a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm secured over the array of microimages to generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 6
Dependent Claim
19 words
A security device according to claim 4, wherein the array of microlenses is formed in a transparent polymeric composition.
Claim 7
Dependent Claim
15 words
A security device according to claim 5, wherein the transparent polymeric array composition is colored.
Claim 8
Dependent Claim
20 words
A security device according to claim 6, wherein the microlens array is transparent and provided with stripes of different colors.
Claim 9
Dependent Claim
49 words
A security device according to claim 1, wherein the array of microimages includes a plurality of sets of microimages, and wherein the microimages within each of the sets are the same while the microimages of each of the sets differ from the microimages of other ones of the sets.
Claim 10
Dependent Claim
20 words
A security device according to claim 8, wherein different ones of the microimages define different views of a same image.
Claim 11
Dependent Claim
133 words
A security device according to claim 8, further comprising a two-dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm secured over the array of microimages to generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered, wherein the array of microimages includes at least two sets of microimages, at least one of the sets of microimages having a pitch different from a pitch of the microlens array such that each magnified version of one of the microimages includes at least two elements moving at different apparent rates and forming different numbers magnified images of each element.
Claim 12
Dependent Claim
16 words
A device according to claim 8, wherein each of the sets of microimages is differently colored.
Claim 13
Dependent Claim
26 words
A security device according to claim 1, wherein the microlenses comprise astigmatic spherical lenses having different focal lengths in mutually orthogonal directions around the optical axis.
Claim 14
Dependent Claim
100 words
A security device comprising an optical device exhibiting an optically variable image, the optically variable device further including a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm and which, when viewed through a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each microlens having a diameter in the range of substantially 50-250 μm, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 15
Dependent Claim
100 words
A security device comprising an optical device exhibiting an optically variable image, the optically variable device further including a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm and which, when viewed through a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each microlens having a diameter in the range of substantially 50-250 μm, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 16
Dependent Claim
15 words
A security device according to claim 13, wherein the optically variable image comprises a hologram.
Claim 17
Dependent Claim
17 words
A security device according to claim 14, wherein the hologram is formed by a surface relief pattern.
Claim 18
Dependent Claim
16 words
A security device according to claim 13, wherein the microimages are provided as a surface relief.
Claim 19
Dependent Claim
74 words
A security device according to claim 13, further comprising a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm secured over the array of microimages to generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 20
Dependent Claim
19 words
A security device according to claim 17, wherein the array of microlenses is formed in a transparent polymeric composition.
Claim 21
Dependent Claim
14 words
A security device according to claim 18, wherein the transparent polymeric composition is colored.
Claim 22
Dependent Claim
20 words
A security device according to claim 19, wherein the microlens array is transparent and provided with stripes of different colors.
Claim 23
Dependent Claim
35 words
A security device according to claim 17, comprising a transparent substrate on one side of which is provided the array of microlenses and on the other side of which is provided the array of microimages.
Claim 24
Dependent Claim
13 words
A security device according to claim 21, wherein the transparent substrate is plastics.
Claim 25
Dependent Claim
26 words
A security device according to claim 13, wherein the microlenses comprise astigmatic spherical lenses having different focal lengths in mutually orthogonal directions around the optical axis.
Claim 26
Dependent Claim
49 words
A security device according to claim 13, wherein the array of microimages includes a plurality of sets of microimages, and wherein the microimages within each of the sets are the same while the microimages of each of the sets differ from the microimages of other ones of the sets.
Claim 27
Dependent Claim
21 words
A security device according to claim 24, wherein the different ones of the microimages define different views of a same image.
Claim 28
Dependent Claim
134 words
A security device according to claim 24, further comprising a two-dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm secured over the array of microimages to generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered, wherein the array of microimages includes at least two sets of microimages, at least one of the sets of microimages having a pitch different from a pitch of the microlens array such that each magnified version of one of the microimages includes at least two elements moving at different apparent rates and forming different numbers of magnified images of each element.
Claim 29
Dependent Claim
134 words
A security device according to claim 24, further comprising a two-dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm secured over the array of microimages to generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered, wherein the array of microimages includes at least two sets of microimages, at least one of the sets of microimages having a pitch different from a pitch of the microlens array such that each magnified version of one of the microimages includes at least two elements moving at different apparent rates and forming different numbers of magnified images of each element.
Claim 30
Independent Claim
89 words
A method of preparing a record medium for use in producing a security device, the method comprising imaging an object or image onto the record medium through a regular two dimensional array of substantially spherical microlenses, each of the microlens having a diameter in the range of substantially 50-250 μm, so as to record a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm and having substantially a same pitch as a pitch of the array of microlenses.
Claim 31
Independent Claim
89 words
A method of preparing a record medium for use in producing a security device, the method comprising imaging an object or image onto the record medium through a regular two dimensional array of substantially spherical microlenses, each of the microlens having a diameter in the range of substantially 50-250 μm, so as to record a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm and having substantially a same pitch as a pitch of the array of microlenses.
Claim 32
Dependent Claim
14 words
A method according to claim 28, wherein the record medium comprises a printing plate.
Claim 33
Dependent Claim
46 words
A method according to claim 28, wherein the imaging step comprises imaging the object or image onto a record medium through a plurality of different two dimensional arrays of substantially spherical microlenses, each of the microlens having a diameter in the range of substantially 50-250 μm.
Claim 34
Dependent Claim
22 words
A method according to claim 30, wherein the image or object is imaged through two of said arrays of substantially spherical microlenses.
Claim 35
Dependent Claim
19 words
A method according to claim 30, wherein pitches of the arrays of microlens vary by between 5 and 50%.
Claim 36
Dependent Claim
15 words
A method according to claim 32, wherein the variation in the pitches is substantially 20%.
Claim 37
Independent Claim
106 words
A method of manufacturing a security device, the method comprising: printing a regular two dimensional array of substantially identical microimages on a record medium, each of the microimages having a dimension up to about 250 μm; and securing over the array of microimages, a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlens having a diameter in the range of substantially 50-250 μm, such that on viewing, at least one magnified version of one of the microimages is visible when the array of microimages and the array of microlenses are at least partially registered.
Claim 38
Independent Claim
106 words
A method of manufacturing a security device, the method comprising: printing a regular two dimensional array of substantially identical microimages on a record medium, each of the microimages having a dimension up to about 250 μm; and securing over the array of microimages, a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlens having a diameter in the range of substantially 50-250 μm, such that on viewing, at least one magnified version of one of the microimages is visible when the array of microimages and the array of microlenses are at least partially registered.
Claim 39
Dependent Claim
32 words
A method according to claim 34, wherein an allowable tolerance during the securing step between the array of microimages and the array of microlenses is in a range of between 0.25-0.5 mm.
Claim 40
Dependent Claim
16 words
A method according to claim 34, wherein the printing step comprises a lithographic or intaglio process.
Claim 41
Dependent Claim
35 words
A method according to claim 34, wherein step of securing an array of substantially spherical microlenses comprises laying a transparent medium on the record medium, and forming the array of microlenses in the transparent medium.
Claim 42
Dependent Claim
14 words
A method according to claim 37, wherein the forming step comprises an intaglio process.
Claim 43
Dependent Claim
95 words
A security document carrying a security device, the security device comprising a regular two dimensional array of substantially identical printed microimages, each of the microimages having a dimension of up to about 250 μm and which, When viewed through a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each microlens having a diameter in the range of substantially 50-250 μm, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least martially registered.
Claim 44
Dependent Claim
95 words
A security document carrying a security device, the security device comprising a regular two dimensional array of substantially identical printed microimages, each of the microimages having a dimension of up to about 250 μm and which, When viewed through a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each microlens having a diameter in the range of substantially 50-250 μm, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least martially registered.
Claim 45
Dependent Claim
108 words
A security document carrying a security device, the security device comprising an optically variable device exhibiting an optically variable image, the optically variable device further including a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm and which, when viewed through a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each microlens having a diameter in the range of substantially 50-250 μm, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 46
Dependent Claim
108 words
A security document carrying a security device, the security device comprising an optically variable device exhibiting an optically variable image, the optically variable device further including a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm and which, when viewed through a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each microlens having a diameter in the range of substantially 50-250 μm, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 47
Dependent Claim
95 words
A security document carrying a security device, the security device comprising a record medium, the record medium being prepared by a method comprising imaging an object or image onto the record medium through a regular two dimensional array of substantially spherical microlenses, each of the microlens having a diameter in the range of substantially 50-250 μm, so as to record a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm and having substantially a same pitch as a pitch of the array of microlenses.
Claim 48
Dependent Claim
95 words
A security document carrying a security device, the security device comprising a record medium, the record medium being prepared by a method comprising imaging an object or image onto the record medium through a regular two dimensional array of substantially spherical microlenses, each of the microlens having a diameter in the range of substantially 50-250 μm, so as to record a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm and having substantially a same pitch as a pitch of the array of microlenses.
Claim 49
Dependent Claim
112 words
A security document carrying a security device, the security device being manufactured by a method comprising: printing a regular two dimensional array of substantially identical microimages on a record medium, each of the microimages having a dimension up to about 230 μm; and securing over the array of microimages, a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlens having a diameter in the range of substantially 50-250 μm, such that on viewing, at least one magnified version of one of the microimages is visible when the array of microimages and the array of microlenses are at least partially registered.
Claim 50
Dependent Claim
112 words
A security document carrying a security device, the security device being manufactured by a method comprising: printing a regular two dimensional array of substantially identical microimages on a record medium, each of the microimages having a dimension up to about 230 μm; and securing over the array of microimages, a two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, each of the microlens having a diameter in the range of substantially 50-250 μm, such that on viewing, at least one magnified version of one of the microimages is visible when the array of microimages and the array of microlenses are at least partially registered.
Claim 51
Independent Claim
87 words
A method of authenticating a security device, the security device including a regular two dimensional array of substantially identical printed microimages, each of the microimages having a dimension of up to about 250 μm, the method comprising: positioning a two dimensional array of substantially spherical microlenses having substantially a same pitch as a pitch of the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm, over the security device; and viewing the security device through the array of microlenses.
Claim 52
Independent Claim
87 words
A method of authenticating a security device, the security device including a regular two dimensional array of substantially identical printed microimages, each of the microimages having a dimension of up to about 250 μm, the method comprising: positioning a two dimensional array of substantially spherical microlenses having substantially a same pitch as a pitch of the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm, over the security device; and viewing the security device through the array of microlenses.
Claim 53
Independent Claim
100 words
A method of authenticating a security device, the wherein security device an optically variable device exhibiting an optically variable image, the optically variable device further including a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm, the method comprising: positioning a two dimensional array of substantially spherical microlenses having substantially a same pitch as a pitch of the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm, over the security device; and viewing the security device through the array of microlenses.
Claim 54
Independent Claim
100 words
A method of authenticating a security device, the wherein security device an optically variable device exhibiting an optically variable image, the optically variable device further including a two dimensional array of substantially identical microimages, each of the microimages having a dimension of up to about 250 μm, the method comprising: positioning a two dimensional array of substantially spherical microlenses having substantially a same pitch as a pitch of the array of microimages, each of the microlenses having a diameter in the range of substantially 50-250 μm, over the security device; and viewing the security device through the array of microlenses.
Claim 55
Dependent Claim
116 words
A security device reader comprising: a two dimensional array of substantially spherical microlenses, each of the microlenses having a diameter in the range substantially 50-250 μm; and a security document holder for locating a security document having a security device, the security device comprising a regular two dimensional array of substantially identical printed microimages, each of the microimages having a dimension of up to about 250 μm and which, when viewed through the two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 56
Dependent Claim
116 words
A security device reader comprising: a two dimensional array of substantially spherical microlenses, each of the microlenses having a diameter in the range substantially 50-250 μm; and a security document holder for locating a security document having a security device, the security device comprising a regular two dimensional array of substantially identical printed microimages, each of the microimages having a dimension of up to about 250 μm and which, when viewed through the two dimensional array of substantially spherical microlenses having substantially a same pitch as the array of microimages, generate at least one magnified version of one of the microimages when the array of microimages and the array of microlenses are at least partially registered.
Claim 57
Dependent Claim
34 words
A reader according to claim 45, wherein the array of microlenses and the security document holder are relatively rotatable, the axis of rotation being normal to a plane defined by the array of microlenses.
References Cited (Backward Citations)
US3860955A
Cited
US4509824A
Cited
EP0203752A2
Cited
EP0215672A2
Cited
US4765656A
Cited
US4892336A
Cited
US5363240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-26 | 2001-07-28 | 2002-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-26 | 2005-07-28 | 2006-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-26 | 2009-07-28 | 2010-01-27 | $7700.00 | Window Closed / Lapsed |