Video projecting structure, method for manufacturing video projecting structure, video projecting method, and automobile window
View Patent ↗A video projecting structure includes a substrate having a visible light transmittance greater than or equal to 5% and less than or equal to 90%, a reflectivity greater than or equal to 5% and less than or equal to 90%, and a front haze less than or equal to 30.
1. An image projecting structure comprising:
a substrate having a visible light transmittance greater than or equal to 5% and less than or equal to 90%, a reflectivity greater than or equal to 5% and less than or equal to 70%, and a front haze less than or equal to 20,
wherein in a case where light is incident on a surface of the substrate at an angle of 45°, an intensity ratio of a light scattering rearward in a direction normal to the substrate to a light scattering frontward in the direction normal to the substrate is greater than or equal to 0.8.
2. The image projecting structure as claimed in claim 1 , wherein the substrate has a rear haze greater than or equal to 5.
3. The image projecting structure as claimed in claim 1 , wherein in a case where light is incident on a surface of the substrate at an angle of 45°, a value obtained by dividing the intensity ratio of the light scattering rearward in the direction normal to the substrate to the light scattering frontward in the direction normal to the substrate by the front haze is greater than or equal to 0.1.
4. The image projecting structure as claimed in claim 1 ,
wherein the substrate comprises:
a first transparent layer having a surface on which random irregularities are formed;
a reflection layer formed on the surface of the first transparent layer; and
a second transparent layer formed on the reflection layer.
5. The image projecting structure as claimed in claim 4 , wherein the first transparent layer and the second transparent layer are transparent resin layers.
6. The image projecting structure as claimed in claim 4 ,
wherein an average roughness (Ra) of the random irregularities of the first transparent layer satisfies
0.01 μm≤ Ra≤ 20 μm, and
wherein a maximum value of a Point-to-Valley (PV) of the random irregularities satisfies
PV≤ 50 μm.
7. The image projecting structure as claimed in claim 6 ,
wherein the average roughness (Ra) of the random irregularities of the reflection film satisfies
0.01 μm≤ Ra≤ 20 μm, and
wherein the maximum value of a Peak-to-Valley (PV) of the random irregularities satisfies
PV≤ 50 μm.
8. The image projecting structure as claimed in claim 4 ,
wherein in a case where c k , ω k , Y, X, and Y ave satisfy Equations 1 to 5 when X is greater than or equal to 20, Equation 6 is satisfied,
wherein Equation 1 is
c
k
=
c
(
ω
k
)
=
1
N
∑
n
=
0
N
-
1
exp
(
4
π
nz
(
x
n
)
λ
)
exp
(
-
i
ω
k
n
)
,
wherein N represents a positive integer, n represents an integer from 0 to N−1, x n represents N number of coordinates having constant intervals on a plane parallel to a main plane of the first transparent layer, wherein coordinate x 0 is zero and coordinate x N is xN, z(x n ) represents a height of irregularities at the coordinate x n , k represents a value in which a reciprocal of k multiplied with xN is a width of the irregularities in an in-plane direction of the first transparent layer, λ represents a wavelength of incident light, and i represents an imaginary unit;
wherein
Equation 2 is
ω
k
=
2
π
N
k
,
wherein Equation 3 is
Y=|c k | 2
wherein Equation 4 is
X=kx N /N
wherein Equation 5 is
Y
ave
=
1
6
∫
X
X
+
6
Y
(
X
)
d
X
,
wherein Equation 6 is
0.01
X
2
<
Y
ave
<
0.01
X
+
10
-
0.005
X
+
1
.
9. The image projecting structure as claimed in claim 4 ,
wherein the reflection layer comprises aluminum or silver,
wherein the reflection layer has a thickness of from 1 nm to 100 nm.
10. The image projecting structure as claimed in claim 4 ,
wherein a difference of refractive indices between the first transparent layer and the second transparent layer is less than or equal to 0.1.
11. The image projecting structure as claimed in claim 4 ,
wherein an aspect ratio of the random irregularities formed on the surface of the first transparent layer is less than or equal to 0.5.
12. The image projecting structure as claimed in claim 4 ,
wherein an inclination angle of the random irregularities is less than or equal to 45 degrees.
13. The image projecting structure as claimed in claim 4 ,
wherein a median value of a height of the random irregularities is greater than or equal to 0.005 μm and less than or equal to 50 μm.
14. A image projecting method comprising:
projecting an image to the image projecting structure of claim 1 from a projector such that the image reflected by the image projecting structure is visually recognized.
15. An automobile window comprising:
the image projecting structure of claim 1 .
16. A method for manufacturing an image projecting structure, the method comprising:
applying a resin material on a surface of a transparent substrate;
placing a mold on the resin material, the mold having a surface on which random irregularities are formed, the mold being placed in a manner that the surface is placed on the resin material;
curing or solidifying the resin material to form a first transparent layer which has a surface on which random irregularities are formed;
peeling the first transparent layer from the mold;
forming a reflection layer on the surface of the first transparent layer;
applying another resin material on the reflection layer and curing or solidifying the another resin material to form a second transparent layer, such that the image projecting structure of claim 1 is manufactured.
17. The method as claimed in claim 16 , wherein the mold comprises a resin film having a surface on which random irregularities are formed.
18. The method as claimed in claim 16 , wherein the resin material is a photocurable resin.