Video projecting structure, method for manufacturing video projecting structure, video projecting method, and automobile window

Patent metadata

Field	Value
Publication number	US-9952494-B2
Application number	US-201615366745-A
Country	US
Kind code	B2
Filing date	Dec 1, 2016
Priority date	Jun 2, 2014
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

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.

First claim

The invention claimed is:

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

⁢

Assignees

• Asahi Glass Co Ltd

Inventors

• Tao Yukihiro
• Sekikawa Kenta
• Tsujimura Hitoshi
• Ebata Kenichi
• Kaida Yuriko

Classifications

• G03B21/602

  Lenticular screens (G03B21/625 takes precedence) · CPC title

• G02B5/02

  Diffusing elements; Afocal elements · CPC title

• G02B5/08

  Mirrors {(vehicle mirrors involving special optical features B60R1/08)} · CPC title

• G02B5/0284

  used in reflection · CPC title

• G02B5/0236 Primary

  the diffusion taking place within the volume of the element · CPC title