GB1394021A - Optical interference authenticating arrangement - Google Patents

Optical interference authenticating arrangement

Info

Publication number
GB1394021A
GB1394021A GB2673A GB2673A GB1394021A GB 1394021 A GB1394021 A GB 1394021A GB 2673 A GB2673 A GB 2673A GB 2673 A GB2673 A GB 2673A GB 1394021 A GB1394021 A GB 1394021A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
filter
amp
substrate
layer
optical interference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2673A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canadian Patents and Development Ltd
Original Assignee
Canadian Patents and Development Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/20Filters
    • G02B5/28Interference filters
    • G02B5/285Interference filters comprising deposited thin solid films
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing specially adapted to determine the identity or genuineness of paper currency or similar valuable papers or for segregating those which are alien to a currency or otherwise unacceptable
    • G07D7/06Testing specially adapted to determine the identity or genuineness of paper currency or similar valuable papers or for segregating those which are alien to a currency or otherwise unacceptable using wave or particle radiation
    • G07D7/12Visible light, infra-red or ultraviolet radiation
    • G07D7/1205Testing spectral properties

Abstract

1394021 Credit cards and the like CANADIAN PATENTS & DEVELOPMENT Ltd 1 Jan 1973 [18 Jan 1972] 26/73 Heading B6A [Also in Division G2] An optical interference authenticating arrangement comprises a filter composed of at least one optical interference layer having a known characteristic of spectral reflectance and a different known characteristic of spectral transmittance, both characteristics varying with the angle of incidence. Materials mentioned are cryolite, MgF 2 , SiO, SiO 2 , ThF 4 , ZnS, TiO 2 , ZrO 2 , Ag, Al, Au, Cu, Cr, Ge, Ni, NiCr, Si, and the filter overlies and is attached to a substrate having at least a portion of it surface, adjacent the filter, coloured to absorb some at least of the transmitted light. The substrate may be a bank note, credit card or valuable document, and the filter may be overlain by a transparent polyester film. In one embodiment the filter comprises an anti-reflection layer for the visible spectrum, having high reflectance for the infra-red, on a substrate comprising a black layer or coating which may be applied, e.g. printed, on the bank note &c. Alternatively, the filter may have high reflectance in the visible spectrum and high transmittance in the infra red, the substrate comprising a layer of patterns or inscriptions which may be printed on the bank note &c. In the first embodiment tilting the note increases the amount of light reflected; in the second, tilting causes the patterns &c. to become visible, see Figs. 6 and 7 (not shown).
GB2673A 1972-01-18 1973-01-01 Optical interference authenticating arrangement Expired GB1394021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 132683 CA944987A (en) 1972-01-18 1972-01-18 Optical interference authenticating means

Publications (1)

Publication Number Publication Date
GB1394021A true true GB1394021A (en) 1975-05-14

Family

ID=4092096

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2673A Expired GB1394021A (en) 1972-01-18 1973-01-01 Optical interference authenticating arrangement

Country Status (2)

Country Link
CA (1) CA944987A (en)
GB (1) GB1394021A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3206062A1 (en) * 1981-02-19 1982-08-19 Rca Corp Faelschungsgefaehrdeter object with certifiable device
US4589686A (en) * 1980-11-05 1986-05-20 Mcgrew Stephen P Anticounterfeiting method and device
US4832424A (en) * 1982-09-30 1989-05-23 Mcgrew Stephen P White-light viewable, cylindrical holograms and method of spatially filtering wavefronts
DE3248989C2 (en) * 1981-08-24 1992-01-23 Commonwealth Scientific And Industrial Research Organization, Campbell, Au

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1243867A (en) * 1984-10-12 1988-11-01 National Research Council Of Canada Viewing angle colour sensitive lighting accessory
US5271644A (en) * 1991-08-29 1993-12-21 Canadian Bank Note Company, Limited Security device comprising optically variable data and method for making the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589686A (en) * 1980-11-05 1986-05-20 Mcgrew Stephen P Anticounterfeiting method and device
DE3206062A1 (en) * 1981-02-19 1982-08-19 Rca Corp Faelschungsgefaehrdeter object with certifiable device
DE3248989C2 (en) * 1981-08-24 1992-01-23 Commonwealth Scientific And Industrial Research Organization, Campbell, Au
US4832424A (en) * 1982-09-30 1989-05-23 Mcgrew Stephen P White-light viewable, cylindrical holograms and method of spatially filtering wavefronts

Also Published As

Publication number Publication date Type
CA944987A1 (en) grant
CA944987A (en) 1974-04-09 grant

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19921230