Title:
A lighting sheet and a lighting layered product
Document Type and Number:
Japanese Patent JP6135889
Kind Code:
B2
Abstract:
[Problem] To provide a natural-light collecting sheet and natural-light collecting laminated body that can, in response to differences in the height of sunlight due to the season and time of day, make an entire room brighter, and give someone in the room an even greater feeling of comfort without allowing there to be a time period when it becomes unnaturally dark. [Solution] A natural-light collecting sheet 1 includes: a light transmitting part 11 in which a plurality of grooves are formed in one surface thereof, and which transmits light; and a light deflecting part 12 which is formed inside of the plurality of grooves of the light transmitting part 11, and which has a refractive index that is lower than that of the light transmitting part 11. The natural-light collecting sheet is characterized by the following: the light deflecting part 12 has a first upper side 12a and a second upper side 12b on the side that forms the upper part of the light deflecting part, and has a lower side 12d on the side that forms the lower part of the light deflecting part; the first upper side 12a and the second upper side 12b are connected so as to protrude downward; the angle that the lower side 12d forms with the normal line of the one surface of the light transmitting part 11 is 1-6 degrees; and the ratio of the length D of the normal-line direction of the light deflecting part 12 to the pitch P of the light deflecting part is 2.5-3.5.
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Inventors:
Yoshihiro Kanai
Masato Ideue
Masato Ideue
Application Number:
JP2016561565A
Publication Date:
May 31, 2017
Filing Date:
November 20, 2015
Export Citation:
Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
G02B5/00; B32B3/30; B32B7/023; E06B5/00; F21S11/00
Domestic Patent References:
| JP2012038626A | ||||
| JP2014119738A | ||||
| JP2010259406A | ||||
| JP2014126713A | ||||
| JP2011123478A | ||||
| JP2012255951A | ||||
| JP2009139710A |
Foreign References:
| WO1997031276A1 | ||||
| WO2015098940A1 |
Attorney, Agent or Firm:
Takashi Koyama
Teiji Tanaka
Teiji Tanaka