DAYLIGHTING FILM AND WINDOW EQUIPPED THEREWITH

• US 20090009870A1
• Filed: 06/20/2007
• Published: 01/08/2009
• Est. Priority Date: 08/03/2006
• Status: Abandoned Application

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: USAMI, Yoshihisa
• Application Number:
  US11/765,589
• Publication Number:
  US 20090009870A1
• Time in Patent Office: Days
• US Class Current: 359/592
• CPC Class Codes: E06B 2009/2417 Light path control; means to control reflection
• CPC Class Codes: E06B 9/24 Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blindsoperating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00
• CPC Class Codes: F21S 11/00 Non-electric lighting devices or systems using daylight roofs with sky-light opening E04D13/03; sun blinds for windows with means for redirecting light onto ceiling of a room E06B9/00; hybrid lighting devices combining artificial and natural light F21S19/00; solar heat collectors F24S; solar cells or solar cell modules H01L31/00
• CPC Class Codes: G02B 5/045 Prism arrays

Abstract

The present invention is to provide a daylighting film that can provide incident sunlight from a window to indoor spots such as the ceiling and visibility from the indoors to the outdoors, and can easily be placed on the window, and also to provide the window that is equipped with the daylighting film. The daylighting film of the present invention contains a translucent support 2, and on at least one surface of the translucent support, unit prisms 3 and plain areas 4 are formed.

Claims

1. A daylighting film, comprising:

a translucent support,

unit prisms, and

plain areas,

wherein the unit prisms and the plain areas are formed on at least one surface of the support.

2. The daylighting film according to claim 1, wherein

each of the unit prisms has a ridge line in a direction, and

the unit prisms are arranged such that the respective ridge lines are parallel to each other at predetermined intervals in a direction perpendicular to the direction.

3. The daylighting film according to claim 1, wherein

the unit prisms and the plain areas are alternately formed on the support.

4. The daylighting film according to claim 1 having a vertical transmittance of 50% or less.

5. The daylighting film according to claim 1, wherein the ratio (M/P) of the pitch (P) between the unit prisms and the width (M) of each of the plain areas is in the range of from 30% to 80%.

6. A window, comprising:

a daylighting film which comprises a translucent support, unit prisms and plain areas,

wherein the unit prisms and the plain areas are formed on at least one surface of the support.