Light redirectly film laminate
Assignee3M Innovative Properties Company
InventorsRaghunath Padiyath, Charles A. Marttila, Mark K. Nestegard
Life of this patent
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Abstract
Light management film constructions contain a first optical film having a first major surface and a second major surface opposite the first major surface. The first major surface is a microstructured surface with asymmetrical structures. The asymmetrical structures form an ordered arrangement of a plurality of multi-sided refractive prisms, with the multi-sided refractive prisms having a cross section of 3 or greater sides. A second optical film contacts and is bonded to substantially all of the structures of the first major structured surface of the first optical film. The light management constructions can be incorporated into optical articles such as windows.
Claims13
A light management film construction comprising:
- a first optical film having a first major surface and a second major surface opposite the first major surface wherein the first major surface comprises a microstructured surface comprising asymmetrical structures wherein the asymmetrical structures comprise an ordered arrangement of a plurality of multi-sided refractive prisms, wherein a cross section of each of the multi-sided refractive prisms comprises 3 or greater sides such that at least one side of each of the multi-sided refractive prisms is a curved surface;
- and
- a second optical film having a first major surface and a second major surface opposite the first major surface, the second major surface disposed adjacent to and making contact with and bonded to substantially all of the structures of the first major structured surface of the first optical film, and wherein the first major surface of the first optical film and second major surface of the second optical film defines an enclosed volume partially occupied by the structures on the first major surface of the first optical film such that the structures occupy 20-80% of the total volume defined.
An article comprising:
- a transparent substrate;
- and
- a light management film attached to the substrate, the light management film comprising:
- a first optical film having a first major surface and a second major surface opposite the first major surface wherein the first major surface comprises a microstructured surface comprising asymmetrical structures;
- and
- a second optical film having a first major surface and a second major surface opposite the first major surface, the second major surface disposed adjacent to and making contact with and bonded to substantially all of the structures of the first major structured surface of the first optical film, and wherein the first major surface of the first optical film and second major surface of the second optical film defines an enclosed volume partially occupied by the structures on the first major surface such that the structures occupy 20-80% of the total volume defined.
The method of redirecting light comprising:
- providing a window;
- providing a light management film construction comprising:
- a first optical film having a first major surface and a second major surface opposite the first major surface wherein the first major surface comprises a microstructured surface comprising asymmetrical structures;
- and
- a second optical film having a first major surface and a second major surface opposite the first major surface, the second major surface disposed adjacent to and making contact with and bonded to substantially all of the structures of the first major structured surface of the first optical film, and wherein the first major surface of the first optical film and second major surface of the second optical film defines an enclosed volume partially occupied by the structures on the first major surface of the first optical film such that the structures occupy 20-80% of the total volume defined;
- and
- attaching the light management film construction to the inside surface or outside surface of the window, wherein attaching the light management film construction to the window comprises contacting an adhesive layer on the light management film to the window.
Dependencies are inferred from the claim text.