OPTICAL LAMINATED PRODUCT AND FITTING

1 . An optical laminated product comprising:

a first transmissive base member;

a second transmissive base member facing the first transmissive base member; and

a structured layer arranged between the first transmissive base member and the second transmissive base member, and configured to perform directional reflection of light which forms part of light passed through the second transmissive base member.

2 . The optical laminated product according to claim 1 , wherein

the light passed through the second transmissive base member includes at least a first wavelength band and a second wavelength band different from the first wavelength band, and

the structured layer is configured to perform directional reflection of light in the first wavelength band, and configured to have light in the second wavelength band passed therethrough.

3 . The optical laminated product according to claim 2 , wherein

the structured layer has a light-transmissive body having a first surface on which directional reflective concave sections are arranged, and

an optical function layer formed on the first surface, and configured to reflect the light in the first wavelength band, and to have the light in the second wavelength band passed therethrough.

4 . The optical laminated product according to claim 3 , wherein

the light-transmissive body further has a second surface defined on the opposite side of the first surface,

the optical laminated product further comprises a first transmissive adhesion layer configured to have the second surface adhered to the first transmissive base member.

5 . The optical laminated product according to claim 4 , further comprising a second transmissive adhesion layer configured to have the structured layer adhered to the second transmissive base member.

6 . The optical laminated product according to claim 4 , further comprising a layer made of inactive gas sealed in between the structured layer and the second transmissive base member.

7 . The optical laminated product according to claim 1 , wherein

the first transmissive base member and the second transmissive base member are respectively made of glass substrates.

8 . The optical laminated product according to claim 2 , wherein

the first wavelength band is an infrared light range, and

the second wavelength band is a visible light range.

9 . The optical laminated product according to claim 2 , which is configured to selectively and directionally reflect the light in the first wavelength band which forms part of light entering an incident surface at an incident angle (θ, φ), in a direction other than a regular reflection angle (−θ, φ+180 degrees), and configured to have the light in the second wavelength band different from the first wavelength band passed therethrough, wherein

“θ” is an angle between a line vertical to the incident surface and the light entering the incident surface or light reflected from the incident surface, and

“φ” is an angle between a specific line on the incident surface and a projected component of the incident light or the reflected light to the incident surface.

10 . The optical laminated product according to claim 9 , wherein

a value of transmission image clarity measured using an optical comb of 0.5 mm in conformity with JIS (Japanese Industrial Standards) K-7105, is equal to or larger than 50 for the light of transmission wavelengths.

11 . The optical laminated product according to claim 9 , wherein

a total of values of transmission image clarity measured using optical combs of 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm in conformity with JIS (Japanese Industrial Standards) K-7105, is equal to or larger than 230 for the light of transmission wavelengths.

12 . The optical laminated product according to claim 9 , wherein

an angle “φ” of a direction of the directional reflection to the light of the first wavelength band is equal to or larger than −90 degrees, and equal to or smaller than 90 degrees.

13 . The optical laminated product according to claim 9 , wherein

a direction of the directional reflection to the light of the first wavelength band is close to an angle of (θ, −φ).

14 . The optical laminated product according to claim 9 , wherein

a direction of the directional reflection to the light of the first wavelength band is close to an angle of (θ, φ).

15 . The optical laminated product according to claim 1 , wherein

the structured layer is a semi-transmissive layer.

16 . The optical laminated product according to claim 1 , wherein

the structured layer includes a plurality of structured layers inclined with respect to the incident surface of light, and

the plurality of structured layers are arranged parallel to each other.

17 . The optical laminated product according to claim 1 , wherein

the structured layer has a structure having one of a shape of prism, cylinder, hemisphere, and corner cube.

18 . The optical laminated product according to claim 17 , wherein

the structure is arranged as one or two-dimensional structure, and

the structure has a main axis inclined in an array direction of the structure with respect to a perpendicular line of the incident surface.

19 . The optical laminated product according to claim 1 , wherein

an absolute value of a difference of chromatic coordinates “x” and an absolute value of a difference of chromatic coordinates “y” of light entered through one of surfaces of the optical laminated product at an incident angle which is equal to or larger than 5 degrees and equal to or smaller than 60 degrees, and regularly reflected by the optical laminated product, are equal to or smaller than 0.05 in each of the surfaces of the optical laminated product.

20 . The optical laminated product according to claim 1 , further comprising

one of a water-shedding layer and a hydrophilic layer on one principal surface of the optical laminated product.

21 . A fitting comprising

a light entrance portion provided with the optical laminated product according to claim 1 .