Daylighting film

Patent metadata

Field	Value
Publication number	US-9863593-B2
Application number	US-201415035570-A
Country	US
Kind code	B2
Filing date	Nov 10, 2014
Priority date	Nov 13, 2013
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A daylighting film ( 1 ) according to one aspect of the present invention includes a base member ( 10 ) having optical transparency, first projections ( 11 ) having optical transparency and formed on an inner surface ( 10 a ) of the base member ( 10 ), a second projection ( 12 ) formed on the inner surface ( 10 a ) and having a height from the inner surface ( 10 a ) higher than a height of the first projections ( 11 ), a protective base member ( 13 ) arranged in an opposite relation to the inner surface ( 10 a ) of the base member ( 10 ), a bonding layer ( 14 ) for bonding the second projection ( 12 ) and the protective base member ( 13 ), and gaps ( 15 ) defined between the first projections ( 11 ) and between the first projection ( 11 ) and the second projection ( 12 ), wherein the first projections ( 11 ) include reflective surfaces ( 11 c 2 ) at which light incoming from an outer surface ( 13 b ) side of the protective base member ( 13 ) or the base member ( 10 ) is totally reflected.

First claim

The invention claimed is:

1. A daylighting film comprising:
a first base member having optical transparency, the first base member comprising a first surface and a second surface;
a plurality of first projections having optical transparency and formed on the first surface;
a plurality of second projections formed on the first surface and having a height from the first surface higher than a height of the plurality of first projections;
a second base member arranged in an opposite relation to the first surface, the second base member comprising a third surface and a fourth surface;
an adhesive for bonding the plurality of second projections and the second base member, the adhesive being provided in a region formed by side surfaces of the plurality of second projections, the third surface and a predetermined surface that is higher than the third suface by a predetermined height; and
gaps defined between the plurality of first projections and between the plurality of first projections and the plurality of second projections,
wherein the plurality of first projections comprise reflective surfaces at which light incoming from a side of the second surface of the first base member or a side of the fourth surface of the second base member is totally reflected.

2. The daylighting film according to claim 1 , wherein the plurality of second projections have optical transparency.

3. The daylighting film according to claim 1 , wherein the predetermined height is smaller than a difference between a height of the plurality of second projections and a height of the plurality of first projections.

4. The daylighting film according to claim 1 , wherein an upper end of the plurality of second projections contacts the third surface.

5. A daylighting film comprising:
a first base member having optical transparency, the first base member comprising a first surface and a second surface;
a plurality of first projections and a plurality of second projections both having optical transparency and formed on the first surface;
a second base member arranged in an opposite relation to the first surface, the second base member comprising a third surface and a fourth surface;
a first gap defined between the plurality of first projections;
a second gap defined between the plurality of second projections;
a third gap defined between one of the plurality of first projections and one of the plurality of second projections; and
an adhesive filled into the second gap, the adhesive bonding the first base member and the second base member,
wherein the plurality of first projections and the plurality of second projections comprise reflective surfaces at which light incoming from a side of the second surface of the first base member or a side of the fourth surface of the second base member is totally reflected.

6. The daylighting film according to claim 5 , wherein the adhesive is filled into the second gap surrounded by the plurality of second projections adjacent to each other on the first surface of the first base member, and by the second base member.

7. The daylighting film according to claim 5 , wherein the adhesive is filled into the second gap surrounded by the plurality of second projections, the second gap being positioned in a space sandwiched between the first base member and the second base member.

8. The daylighting film according to claim 5 , wherein the plurality of second projections comprise end surfaces formed, on a side close to the second base member, parallel to the first surface.

9. The daylighting film according to claim 8 , wherein a light transmittance T 1 in regions of the first surface of the first base member where the end surfaces of the plurality of second projections are present, and a light transmittance T 2 in other regions satisfy a relation of T 1 <T 2 .

10. The daylighting film according to claim 5 , wherein the adhesive is not filled in the first gap or the third gap.

11. The daylighting film according to claim 5 , wherein an upper end of the plurality of second projections contacts the third surface.

12. A daylighting film comprising:
a first base member having optical transparency;
a plurality of projections having optical transparency and formed on a first surface of the first base member;
a second base member arranged in an opposite relation to the first surface of the first base member;
an adhesive for bonding the first base member and the second base member, the adhesive including a spacer; and
a gap defined between the plurality of projections,
wherein the plurality of projections comprise reflective surfaces at which light incoming from a second surface side of the second base member or the first base member is totally reflected.

13. The daylighting film according to claim 12 , wherein, assuming that a surface area of an inclined surface of the plurality of projections is denoted by Sa, and a surface area of a portion of the inclined surface, the portion being buried in the adhesive, is denoted by Sb, Sb≦Sa/2 is satisfied.

14. The daylighting film according to claim 12 , wherein an irregular or uneven surface is formed at an end of the plurality of projections on a side close to the second base member, the end contacting the adhesive.

15. The daylighting film according to claim 12 , wherein the adhesive is only provided in a region between a part of the first surface and a part of the third surface.

16. The daylighting film according to claim 12 , wherein the adhesive has a circular hollow cylinder shape, and the spacer has a spherical shape.

Assignees

• Sharp Kk

Inventors

• Sakuragi Kazuyoshi
• Kamada Tsuyoshi
• Ueki Shun
• Nango Tomoko
• Tsujimoto Masahiro
• Tsuda Yuhsuke

Classifications

• E06B3/67

  characterised by additional arrangements or devices for heat or sound insulation {or for controlled passage of light} · CPC title

• F21S11/00 Primary

  Non-electric lighting devices or systems using daylight {(hybrid lighting devices combining artificial and natural light F21S19/00; roofs with sky-light opening E04D13/03; sun blinds for windows with means for redirecting light onto ceiling of a room E06B9/00; solar heat collectors F24S)} · CPC title

• G02B7/182

  for mirrors · CPC title

• G02B5/00

  Optical elements other than lenses (light guides G02B6/00; optical logic elements G02F3/00) · CPC title

• E06B5/00

  Doors, windows, or like closures for special purposes {(insulated compound frames specially adapted for sliding doors or windows E06B3/26347)}; Border constructions therefor · CPC title