Light guide film, and light guide
AssigneeFuji Photo Film Co., Ltd.
InventorYoshihisa Usami
Life of this patent
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Abstract
The invention relates to a light guide film that can take in sunlight or the like for easy guidance of the light to any desired site. The light guide film comprises a flexible transparent film 1 that is provided with entrance means 2 on one side of a part 11 of its longitudinal portion and exit means 2 on one side of other part 12. An intermediate portion 13 between the parts 11 and 12 remains smooth on both sides. Light introduced from the entrance means 2 of the part 11 into the transparent film 1 is guided via the intermediate portion 13 to the exit means 2 of the part 12, from which the light is emitted.
Claims21
A light guide film comprising a flexible transparent film, wherein the transparent film is provided with entrance means and exit means, so that light entered from the entrance means in the transparent film is guided to the exit means, from which the light is emitted.
A light guide film comprising a transparent film, wherein the transparent film is branched at a proper position in such a way as to include at least three ends, so that light entered from near at least one end thereof is guided to a plurality of remaining ends, from near which the light is emitted.
A light guide film comprising a transparent film, wherein the transparent film is branched at a proper position in such a way as to include at least three ends, so that light introduced from near a plurality of ends thereof is guided to a plurality of or one end, from near which the light is emitted.
A light guide comprising a transparent member with anisotropic fine particles dispersed and incorporated while oriented in a part thereof, wherein the anisotropic fine particles includes a scattering component that is scattered in a direction substantially perpendicular to a given direction of incidence of light having a given wavelength, and a quantity-of-scattered-light ratio between a direction in which a quantity of scattered light is greatest and a direction perpendicular to that direction, in which the quantity of scattered light is smallest, is at least 1.5.
A light guide comprising a transparent member with anisotropic fine particles dispersed and incorporated while oriented in a part thereof, wherein the anisotropic fine particles have a diameter or length that is smaller than approximately half of a wavelength of incident light and a thickness that is smaller than one third of that diameter or length.
Dependencies are inferred from the claim text.