CA2202759A1 - Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device - Google Patents

Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device

Info

Publication number
CA2202759A1
CA2202759A1 CA002202759A CA2202759A CA2202759A1 CA 2202759 A1 CA2202759 A1 CA 2202759A1 CA 002202759 A CA002202759 A CA 002202759A CA 2202759 A CA2202759 A CA 2202759A CA 2202759 A1 CA2202759 A1 CA 2202759A1
Authority
CA
Canada
Prior art keywords
optically variable
ascertaining
viewing device
color shift
optical color
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.)
Granted
Application number
CA002202759A
Other languages
French (fr)
Other versions
CA2202759C (en
Inventor
Charles T. Markantes
Roger W. Phillips
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.)
Viavi Solutions Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Priority claimed from PCT/US1995/013456 external-priority patent/WO1996013801A1/en
Publication of CA2202759A1 publication Critical patent/CA2202759A1/en
Application granted granted Critical
Publication of CA2202759C publication Critical patent/CA2202759C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8803—Visual inspection

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

A viewing device (19) for use by an observer (63) to ascertain the authenticity of an instrument of value (16) having an image (17) formed from an optically variable device (18). The viewing device (19) includes a frame structure (23) which permits viewing of the image (17) in a fixed spatial orientation and a reflector (61) carried by the frame structure (23) for permitting the observer (63) to see simultaneously the image (17) in first and second colors without movement of the observer (63), the viewing device (19) or the image (17).
CA002202759A 1994-10-27 1995-10-19 Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device Expired - Fee Related CA2202759C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US33090294A 1994-10-27 1994-10-27
US08/330,902 1994-10-27
PCT/US1995/013456 WO1996013801A1 (en) 1994-10-27 1995-10-19 Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device

Publications (2)

Publication Number Publication Date
CA2202759A1 true CA2202759A1 (en) 1996-05-09
CA2202759C CA2202759C (en) 2006-08-01

Family

ID=36764281

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002202759A Expired - Fee Related CA2202759C (en) 1994-10-27 1995-10-19 Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device

Country Status (1)

Country Link
CA (1) CA2202759C (en)

Also Published As

Publication number Publication date
CA2202759C (en) 2006-08-01

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed