Optical film with recording surface, and display body including optical film

Patent metadata

Field	Value
Publication number	US-10948876-B2
Application number	US-201816203198-A
Country	US
Kind code	B2
Filing date	Nov 28, 2018
Priority date	Jun 3, 2016
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

According to one embodiment, there is provided an optical film with a recording surface, the recording surface including: a computation element section in which a phase component of light from each reconstruction point of a reconstructed image is computed, the computation element section corresponding to each reconstruction point one by one; a phase angle recording area in which a phase angle computed based on the phase component is recorded; and a phase angle non-recording area in which the phase angle is not recorded, the phase angle computed based on the phase component being recorded in an overlapping area where the computation element section and the phase angle recording area overlap each other.

First claim

The invention claimed is:

1. An optical film with a recording surface, the recording surface comprising:
a computation element section in which a phase component of light from each reconstruction point of a reconstructed image is computed, the computation element section corresponding to each reconstruction point one by one;
a phase angle recording area in which a phase angle computed based on the phase component is recorded; and
a phase angle non-recording area in which the phase angle is not recorded,
the phase angle computed based on the phase component being recorded in an overlapping area where the computation element section and the phase angle recording area overlap each other.

2. The optical film according to claim 1 , wherein the phase component of light from each reconstruction point is computed for each unit block, and the phase angle computed based on the phase component is recorded in the phase angle recording area for each unit block.

3. The optical film according to claim 2 , wherein the computation element section is defined by a viewing angle θ shown in an equation of θ<(A/m),
where in a case of (λ/2d)≤1, A=asin(λ/2d), λ is a wavelength of the light, d is an arrangement interval of the unit blocks in a viewing angle direction, and m is a real number of 3 or more.

4. The optical film according to claim 2 , wherein the phase angle is computed from the phase component according to an equation of

W
⁡

(

kx
,
ky

)

=

∑

n
=
0

N
⁢

⁢
ma
⁢

⁢
x

⁢

∑

ky
=
Ymin

Ymax

⁢

∑

kx
=
Xmin

Xmax

⁢

amp
·

exp
⁡

(

i
⁢

⁢
ϕ

)

ϕ
=

π

λ
·

O
n

⁡

(
z
)

⁢

{

(

O
n

⁡

(
x
)

-
kx

)

2

+

(

O
n

⁡

(
y
)

-
ky

)

2

}

where W(kx, ky) is a phase component, n is a number of reconstruction points, and is an integer of zero or more and Nmax or less, amp is amplitude of light at a reconstruction point, i is an imaginary number, λ is a wavelength of light for reconstruction, O n (x, y, z) are coordinates of the reconstruction point, (kx, ky, 0) are coordinates of the unit block, φ is a phase angle, and Xmin, Xmax, Ymin, and Ymax are coordinates defining a range of the computation element section and vary for each reconstruction point.

5. The optical film according to claim 1 , wherein a machine-readable code is recorded in the phase angle recording area.

6. The optical film according to claim 1 , wherein the phase angle non-recording area is a mirror surface.

7. The optical film according to claim 1 , wherein information other than the phase angle is recorded in the phase angle non-recording area.

8. The optical film according to claim 7 , wherein the information other than the phase angle is information including at least one of scattering, reflection, or diffraction characteristics of light.

9. The optical film according to claim 1 , wherein the plural phase angle recording areas having a strip shape are periodically arranged on the recording surface to form a stripe shape.

10. The optical film according to claim 1 , wherein the plural phase angle recording areas having a rectangular shape are periodically and two-dimensionally arranged to form a lattice shape.

11. The optical film according to claims 1 to 10 , wherein the phase angle recording area has a shape of a figure representing a character or a pattern.

12. The optical film according to claim 11 , wherein the figure is used as personal authentication information.

13. The optical film according to claim 1 , wherein the plural computation element sections do not overlap each other within the phase angle recording area.

14. The optical film according to claim 1 , wherein the plural reconstruction points are present on a same plane parallel to the recording surface.

15.

Assignees

• Toppan Printing Co Ltd

Inventors

• Kagotani Akihito

Classifications

• G03H1/0244 Primary

  Surface relief holograms (replicating hologram without interference recording G03H1/0276) · CPC title

• G03H2230/10

  Microhologram not registered to the substrate · CPC title

• G03H1/08

  Synthesising holograms, {i.e. holograms synthesized from objects or objects from holograms}(using electric digital computers G06F; G06T) · CPC title

• G03H1/30

  discrete holograms only · CPC title

• G03H1/02

  Details {of features involved during the holographic process; Replication of holograms without interference recording} · CPC title