DE3474350D1 - Technique for verifying genuineness of authenticating device - Google Patents

Technique for verifying genuineness of authenticating device

Info

Publication number
DE3474350D1
DE3474350D1 DE8484301659T DE3474350T DE3474350D1 DE 3474350 D1 DE3474350 D1 DE 3474350D1 DE 8484301659 T DE8484301659 T DE 8484301659T DE 3474350 T DE3474350 T DE 3474350T DE 3474350 D1 DE3474350 D1 DE 3474350D1
Authority
DE
Germany
Prior art keywords
light
incidence
sample
polychromatic
reflected
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
DE8484301659T
Other languages
German (de)
Inventor
John Riddle Sandercock
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.)
PAUL SCHERRER INSTITUT WUERENLINGEN UND VILLIGEN,
Original Assignee
RCA Corp
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
Application filed by RCA Corp filed Critical RCA Corp
Priority claimed from EP84301659A external-priority patent/EP0155414B1/en
Application granted granted Critical
Publication of DE3474350D1 publication Critical patent/DE3474350D1/en
Expired legal-status Critical Current

Links

Landscapes

  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

The device operates as a diffractive subtractive colour filter that exhibits a reflectivity spectrum that includes a peak occurring at a wavelength that varies as a linear function of the angle of incidence of polychromatic illuminating light having a particular polarisation. The verification technique involves simultaneously illuminating a sample device over a range of angles of incidence by the polychromatic light, and then employing the reflected light from the sample to illuminate a reference device known to be genuine over the same range of angles of incidence. A sample device is indicated as being genuine only if both the respective intensity ratios of the light reflected from the reference device to the polychromatic light and to the light reflected from the sample device exceed respective threshold values.
DE8484301659T 1984-03-12 1984-03-12 Technique for verifying genuineness of authenticating device Expired DE3474350D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84301659A EP0155414B1 (en) 1983-09-01 1984-03-12 Technique for verifying genuineness of authenticating device

Publications (1)

Publication Number Publication Date
DE3474350D1 true DE3474350D1 (en) 1988-11-03

Family

ID=8192588

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8484301659T Expired DE3474350D1 (en) 1984-03-12 1984-03-12 Technique for verifying genuineness of authenticating device

Country Status (1)

Country Link
DE (1) DE3474350D1 (en)

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: PAUL SCHERRER INSTITUT WUERENLINGEN UND VILLIGEN,

8328 Change in the person/name/address of the agent

Free format text: DR. DIETER V. BEZOLD, DIPL.-ING. PETER SCHUETZ, DIPL.-ING. WOLFGANG HEUSLER, 80333 MUENCHEN