DECORATIVE FILM ARTICLES UTILIZING FRESNEL LENS FILMS

• Main Authors: LORIMOR LYNN E, WEBER MICHAEL F, BENOIT GILLES J.B, TROTTER BYRON E, SHAKLEE CHARLES A, KELLEY TOMMIE W, NELSON JAMES M
• Format: Patent
• Language: English
• Published: 09.01.2014
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

First and second optical films in a stack each have a structured surface defining extended Fresnel lenses. First and second Fresnel lenses of the respective first and second films extend generally parallel to different first and second in-plane axes respectively. The films may be attached together such that light transmitted by one film is intercepted by the other. The film stack may also include a diffuser disposed to scatter light transmitted by the optical film(s). Other disclosed decorative articles include an individual optical film having a structured surface with transmissive facets arranged in a cyclic slope sequence from substantially zero to a maximum positive slope to substantially zero to a maximum negative slope and back to substantially zero, the sequence repeating over some or all of the structured surface. The slope sequence may define alternating focusing and defocusing Fresnel lenses, and the Fresnel lenses may be extended and linear.