# US 10,479,017 B2 · Sequential joint behavior sheet using photo deformation and method of controlling folding and unfolding thereof

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- Number: US 10,479,017 B2
- Document ID: US10479017B2
- Status: Granted
- Kind: B2
- Application number: 14/805,990
- Filed: 2015-07-22
- Published: 2016-10-27
- Granted: 2019-11-19
- Earliest claimed: 2015-04-24
- Assignees: Seoul National University R&Db Foundation
- Applicants: Seoul National University R&DB Foundation
- Inventors: Maenghyo Cho; Yonghee Lee; Taesoon Hwang; Jong Gu Lee; Junghyun Ryu; Hyeok Lee
- Web page: https://patentgrep.com/patent/US10479017B2

## CPC

- B29C 61/003: {characterised by the choice of material}
- B29K 2025/06: {PS, i.e. polystyrene}
- B29K 2995/0018: having particular optical properties, e.g. fluorescent or phosphorescent
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

Provided are a sequential joint behavior sheet using photo deformation and a method of controlling folding and unfolding thereof. The sequential joint behavior sheet includes at least three rigid parts, a first joint part joining two of the rigid parts that are adjacent to each other, and a second joint part joining two of the rigid parts that are adjacent to each other and spaced apart from the first joint part. Here, the first and second joint parts have a first state in which the same rigid state as the rigid parts is maintained, and a second state in which one rigid part performs a folding behavior with respect to the other rigid part of the two adjacent rigid parts between the first and second joint parts, the second state being reached when light is absorbed, and print patterns having different degrees of transparency are formed on a transparent high-molecular-weight polymer in the first and second joint parts, and thus a folding behavior is sequentially performed at the first and second joint parts due to different times taken to reach the second state through radiation of light according to degrees of transparency of the first and second joint parts.

## Claims

### Claim 1

A sequential joint sheet using photo deformation, comprising:
at least three rigid parts that are of a rigid state;
a first joint part joining two of the rigid parts that are adjacent to each other; and
a second joint part joining two of the rigid parts that are adjacent to each other and spaced apart from the first joint part,
wherein the first and second joint parts have a first state in which the adjacent rigid parts joined by the first and second joint parts are parallel to each other, and a second state in which a folding behavior occurs along the first and second joint parts wherein one rigid part performs a folding behavior with respect to the other rigid part of the two adjacent rigid parts between the first and second joint parts, the second state being reached when light is absorbed, and
print patterns having different degrees of transparency are formed on a transparent high-molecular-weight polymer in the first and second joint parts, and thus a folding behavior is sequentially performed at the first and second joint parts due to different times taken to reach the second state through radiation of light according to the degrees of transparency of the first and second joint parts when the transparent high-molecular-weight polymer is exposed to uniform light distribution.

### Claim 2 (depends on 1)

The sheet of claim 1, wherein a color of the print pattern is black.

### Claim 3 (depends on 1)

The sheet of claim 1, wherein the first and second joint parts have different widths from each other.

### Claim 4 (depends on 1)

The sheet of claim 1, wherein the high-molecular-weight polymer includes a polystyrene sheet.

### Claim 5

A sequential joint behavior sheet using photo deformation, comprising:
a transparent high-molecular-weight polymer sheet; and
at least two print patterns spaced apart from each other on the high-molecular-weight polymer sheet,
wherein the print patterns form joint parts of the polymer sheet at which adjacent regions are folded with respect to each other based on the print patterns, and
the at least two print patterns are printed in ink to have different degrees of transparency on the high-molecular-weight polymer sheet wherein the at least two print patterns having different degrees of transparency sequentially preform a folding behavior depending on the degree of transparency when the transparent high-molecular-weight sheet is exposed to uniform light distribution.

### Claim 6 (depends on 5)

The sheet of claim 5, wherein the high-molecular-weight polymer sheet includes a polystyrene sheet.

### Claim 7 (depends on 1)

The sheet of claim 1, wherein the degree of transparency of the print pattern in each joint part comprises variations in the concentration of the ink used to form the print pattern.

### Claim 8 (depends on 5)

The sheet of claim 5, wherein the degree of transparency of the print pattern in each joint part comprises variations in the concentration of the ink used to form the print pattern.