CA2316266A1 - Reflective article with concealed retroreflective pattern - Google Patents

Reflective article with concealed retroreflective pattern Download PDF

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Publication number
CA2316266A1
CA2316266A1 CA002316266A CA2316266A CA2316266A1 CA 2316266 A1 CA2316266 A1 CA 2316266A1 CA 002316266 A CA002316266 A CA 002316266A CA 2316266 A CA2316266 A CA 2316266A CA 2316266 A1 CA2316266 A1 CA 2316266A1
Authority
CA
Canada
Prior art keywords
retroreflective
disclosed
spectral range
conditions
incident light
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
CA002316266A
Other languages
French (fr)
Other versions
CA2316266C (en
Inventor
Mark B. O'neill
Michael F. Weber
Olester Benson Jr.
John A. Wheatley
John M. Jonza
Gary B. Hanson
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.)
3M Co
Original Assignee
Minnesota Mining And Manufacturing Company
Mark B. O'neill
Michael F. Weber
Olester Benson Jr.
John A. Wheatley
John M. Jonza
Gary B. Hanson
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 Minnesota Mining And Manufacturing Company, Mark B. O'neill, Michael F. Weber, Olester Benson Jr., John A. Wheatley, John M. Jonza, Gary B. Hanson filed Critical Minnesota Mining And Manufacturing Company
Publication of CA2316266A1 publication Critical patent/CA2316266A1/en
Application granted granted Critical
Publication of CA2316266C publication Critical patent/CA2316266C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/122—Reflex reflectors cube corner, trihedral or triple reflector type
    • G02B5/124—Reflex reflectors cube corner, trihedral or triple reflector type plural reflecting elements forming part of a unitary plate or sheet
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements

Abstract

A reflective article has a multilayer film covering a patterned retroreflective layer. In one embodiment the patterned retroreflective layer includes a separate indicia layer covering a retroreflective substrate. The indicia are substantially hidden under normal viewing conditions but easily detectable under retroreflective lighting conditions. Various types of retroreflective layers are disclosed.
The article can also include microstructured relief patterns which produce holographic images under ambient lighting but which disappear under retroreflective conditions. The multilayer film includes alternating layers of at least a first and second polymer, and has a relatively high reflectivity for normally incident light within a first spectral range which is approximately coextensive with the visible spectrum, and a relatively low reflectance for normally incident light within a second spectral range. The second spectral range can include a transmission window of 15 % or less fractional bandwidth located at least partially in the visible spectrum. Film constructions are disclosed which achieve sharper spectral transitions than previously attainable. Film constructions are also disclosed which preserve such sharp transitions even at high entrance (tilt) angles.
CA002316266A 1998-01-13 1998-12-10 Reflective article with concealed retroreflective pattern Expired - Fee Related CA2316266C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/006,292 1998-01-13
US09/006,292 US6024455A (en) 1998-01-13 1998-01-13 Reflective article with concealed retroreflective pattern
PCT/US1998/026180 WO1999036806A1 (en) 1998-01-13 1998-12-10 Reflective article with concealed retroreflective pattern

Publications (2)

Publication Number Publication Date
CA2316266A1 true CA2316266A1 (en) 1999-07-22
CA2316266C CA2316266C (en) 2008-11-18

Family

ID=21720202

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002316266A Expired - Fee Related CA2316266C (en) 1998-01-13 1998-12-10 Reflective article with concealed retroreflective pattern

Country Status (11)

Country Link
US (1) US6024455A (en)
EP (1) EP1047960B1 (en)
JP (1) JP2002509277A (en)
KR (1) KR100552889B1 (en)
CN (1) CN1138992C (en)
AU (1) AU738111B2 (en)
BR (1) BR9814000B1 (en)
CA (1) CA2316266C (en)
DE (1) DE69816129T2 (en)
ES (1) ES2198087T3 (en)
WO (1) WO1999036806A1 (en)

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CA2316266C (en) 2008-11-18
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BR9814000A (en) 2000-10-10
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KR100552889B1 (en) 2006-02-22
US6024455A (en) 2000-02-15
AU1812699A (en) 1999-08-02
CN1138992C (en) 2004-02-18
JP2002509277A (en) 2002-03-26
AU738111B2 (en) 2001-09-06
DE69816129D1 (en) 2003-08-07
KR20010034060A (en) 2001-04-25
WO1999036806A1 (en) 1999-07-22
CN1285047A (en) 2001-02-21
EP1047960B1 (en) 2003-07-02
BR9814000B1 (en) 2009-01-13

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