Daylight redirecting window film employing embedded microstructures

Patent metadata

Field	Value
Publication number	US-11703200-B2
Application number	US-202217841644-A
Country	US
Kind code	B2
Filing date	Jun 15, 2022
Priority date	Jul 25, 2014
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

A daylight redirecting window film having a layered structure with a total thickness of less than one millimeter and having a first optically transmissive film, a second optically transmissive film approximately coextensive with the first optically transmissive film, an intermediate layer of a relatively soft optically transmissive material disposed between the first and second optically transmissive films, a parallel array of linear three-dimensional structures formed in a space between the first and second optically transmissive films, a layer of an optically transmissive adhesive coating a surface of the first optically transmissive film, and a two-dimensional pattern of light scattering surface microstructures formed in an outer surface of the second optically transmissive film. The parallel array of linear three-dimensional structures defines a parallel array of linear channels, and each of the linear three-dimensional structures has a total internal reflection wall extending transversely through a portion of the layered structure.

First claim

What is claimed is:

1. A daylight redirecting window film having a layered structure with a total thickness of less than one millimeter, comprising:
a first optically transmissive film;
a second optically transmissive film approximately coextensive with the first optically transmissive film;
an intermediate layer of a relatively soft optically transmissive material disposed between the first and second optically transmissive films;
a parallel array of linear three-dimensional structures formed in a space between the first and second optically transmissive films;
a layer of an optically transmissive adhesive coating a surface of the first optically transmissive film; and
a two-dimensional pattern of light scattering surface microstructures formed in an outer surface of the second optically transmissive film,
wherein the parallel array of linear three-dimensional structures defines a parallel array of linear channels each having a width of less than 50 micrometers, wherein each of the parallel array of linear three-dimensional structures has a first wall extending transversely through a portion of the layered structure and configured to reflect light using a total internal reflection, an opposing second wall, and a third wall joining the first and second walls.

2. The daylight redirecting window film of claim 1 , wherein at least one of the linear channels has an average width of about 20 micrometers, and wherein each of the linear channels extends from a first edge of the layered structure to an opposing second edge of the layered structure.

3. The daylight redirecting window film of claim 1 , wherein the layered structure is configured to be attached to an indoor-facing surface of a window of a building façade using the optically transmissive adhesive coating and further configured to mask and/or blur a view of objects through a portion of the window.

4. The daylight redirecting window film of claim 1 , wherein the layered structure is configured to be attached to an indoor-facing surface of a window of a building façade using the optically transmissive adhesive coating and further configured to have one or more edges sealed using an air and/or moisture impermeable encapsulating resin.

5. The daylight redirecting window film of claim 1 , wherein the layered structure is adapted to be operably retained in a bent or rolled configuration.

6. The daylight redirecting window film of claim 1 , wherein the layered structure is configured to be attached to a light transmitting surface of a skylight structure.

7. The daylight redirecting window film of claim 1 , wherein the width is less than 20 micrometers, wherein the layered structure is configured to be attached to an indoor-facing surface of a window of a building façade with a horizontal orientation of the parallel array of linear channels, and is further configured for redirecting daylight to a ceiling.

8. The daylight redirecting window film of claim 1 , wherein a distance between adjacent ones of the linear three-dimensional structures is substantially less than a depth of the linear channels.

9. The daylight redirecting window film of claim 1 , wherein a distance between adjacent ones of the linear three-dimensional structures is less than a depth of the linear channels by at least ten times.

10. The daylight redirecting window film of claim 1 , wherein the layered structure is configured for blocking ultra-violet rays.

11. The daylight redirecting window film of claim 1 , wherein a distance between adjacent ones of the linear three-dimensional structures is less than a depth of the linear channels by at least ten times, wherein the daylight redirecting window film is configured to be attached to an indoor-facing surface of a window of a building façade with a horizontal orientation of the parallel array of linear channels, and is further configured for redirecting daylight to a ceiling.

12. The daylight redirecting window film of claim 1 , wherein a distance between adjacent ones of the linear three-dimensional structures is less than a depth of the linear channels, wherein the layered structure is configured to have one or more edges sealed using an air and/or moisture impermeable encapsulating resin, and is further configured to be attached to an indoor-facing surface of a window of a building façade with a horizontal orientation of the parallel array of linear channels so as to redirect at least a portion of incident daylight to a ceiling.

13. The daylight redirecting window film of claim 1 , wherein a distance between adjacent ones of the linear three-dimensional structures is less than a depth of the linear channels, wherein the layered structure is configured to have one or more edges sealed using an air and/or moisture impermeable encapsulating resin, is further configured to be attached to an indoor-facing surface of a window of a building façade with a horizontal orientation of the parallel array of linear channels so as to redirect at least a portion of incident daylight to a ceiling, and is further configured to mask and/or blur a view of objects through a portion of the window.

14. The daylight redirecting window film of claim 1 , wherein a distance between adjacent ones of the linear three-dimensional structures is less than a depth of the linear channels, wherein the layered structure is configured to have one or more edges sealed using an air and/or moisture impermeable encapsulating resin, is further configured to be attached to an indoor-facing surface of a window of a building façade with a horizontal orientation of the parallel array of linear channels so as to redirect at least a portion of incident daylight to a ceiling, and is further configured to is configured for blocking ultra-violet rays and blur a view of objects through a portion of the window.

15. The daylight redirecting window film of claim 1 , wherein a durometer hardness of a material of the intermediate layer is less than 95 Shore A, wherein a distance between adjacent ones of the linear three-dimensional structures is less than a depth of the linear channels, wherein the layered structure is configured to have one or more edges sealed using an air and/or moisture impermeable encapsulating resin, is further configured to be attached to an indoor-facing surface of a window of a building façade with a horizontal orientation of the parallel array of linear channels so as to redirect at least a portion of incident daylight to a ceiling, and is further configured to mask and/or blur a view of objects through a portion of the window.

16. A daylight redirecting window film having a layered structure, comprising:
a first optically transmissive film;
a second optically transmissive film approximately coextensive with the first optically transmissive film;
an intermediate layer of a relatively soft optically transmissive material disposed between the first and second optically transmissive films;
a parallel array of linear three-dimensional structures formed in a space between the first and second optically transmissive films;
a layer of an optically transmissive adhesive coating a surface of the first optically transmissive film; and
a two-dimensional pattern of light scattering surface microstructures formed in an outer surface of the second optically transmissive film,
wherein the parallel array of linear three-dimensional structures defines a parallel array of linear channels each having a width of less than 50 micrometers, wherein each of the parallel array of linear three-dimensional structures has a first wall extending transversely through a portion of the layered

Assignees

• Vasylyev Sergiy
• S V V Tech Innovations Inc

Inventors

• Vasylyev Sergiy

Classifications

• G02B6/0096

  the lights guides being of the hollow type · CPC title

• F21V11/02

  using parallel laminae or strips, e.g. of Venetian-blind type (F21V11/06 takes precedence) · CPC title

• F21V9/04

  for filtering out infrared radiation (dichroic reflectors F21V7/22; using liquid-filled chambers F21V9/12) · CPC title

• F21S8/026

  intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling · CPC title

• E06B9/28

  with horizontal lamellae, e.g. non-liftable (louvre windows or gratings E06B7/08) · CPC title