GB1394021A - Optical interference authenticating arrangement - Google Patents
Optical interference authenticating arrangementInfo
- 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
- United Kingdom
- Prior art keywords
- filter
- substrate
- optical interference
- layer
- bank note
- 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
Links
- 230000003287 optical effect Effects 0.000 title abstract 3
- 239000000758 substrate Substances 0.000 abstract 4
- 230000003595 spectral effect Effects 0.000 abstract 2
- 238000002834 transmittance Methods 0.000 abstract 2
- 238000001429 visible spectrum Methods 0.000 abstract 2
- 101100234822 Caenorhabditis elegans ltd-1 gene Proteins 0.000 abstract 1
- 229910004298 SiO 2 Inorganic materials 0.000 abstract 1
- 229910010413 TiO 2 Inorganic materials 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 229910001610 cryolite Inorganic materials 0.000 abstract 1
- 229910052737 gold Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229910001120 nichrome Inorganic materials 0.000 abstract 1
- 229920006267 polyester film Polymers 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
- G02B5/285—Interference filters comprising deposited thin solid films
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/1205—Testing spectral properties
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Credit Cards Or The Like (AREA)
- Optical Filters (AREA)
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).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA132,683A CA944987A (en) | 1972-01-18 | 1972-01-18 | Optical interference authenticating means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1394021A 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 (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3206062A1 (en) * | 1981-02-19 | 1982-08-19 | RCA Corp., 10020 New York, N.Y. | COUNTERFEITING OBJECT WITH A CERTIFICATION 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 | David H Solomon | |
| CN108196329A (en) * | 2017-12-19 | 2018-06-22 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of preparation method of medium-wave infrared medium enhancing metal high-reflecting film |
| CN113147216A (en) * | 2021-05-24 | 2021-07-23 | 中钞印制技术研究院有限公司 | Optical anti-counterfeiting element, detection method and device thereof, manufacturing method and device thereof, and security article |
Families Citing this family (2)
| 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 |
-
1972
- 1972-01-18 CA CA132,683A patent/CA944987A/en not_active Expired
-
1973
- 1973-01-01 GB GB2673A patent/GB1394021A/en not_active Expired
Cited By (6)
| 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., 10020 New York, N.Y. | COUNTERFEITING OBJECT WITH A CERTIFICATION DEVICE |
| DE3248989C2 (en) * | 1981-08-24 | 1992-01-23 | David H Solomon | |
| US4832424A (en) * | 1982-09-30 | 1989-05-23 | Mcgrew Stephen P | White-light viewable, cylindrical holograms and method of spatially filtering wavefronts |
| CN108196329A (en) * | 2017-12-19 | 2018-06-22 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of preparation method of medium-wave infrared medium enhancing metal high-reflecting film |
| CN113147216A (en) * | 2021-05-24 | 2021-07-23 | 中钞印制技术研究院有限公司 | Optical anti-counterfeiting element, detection method and device thereof, manufacturing method and device thereof, and security article |
Also Published As
| Publication number | Publication date |
|---|---|
| CA944987A (en) | 1974-04-09 |
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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 |