# US 11,897,184 B2 · Photo-responsive self-deforming structure and method of driving same

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- Number: US 11,897,184 B2
- Document ID: US11897184B2
- Status: Granted
- Kind: B2
- Application number: 17/043,431
- Filed: 2019-06-04
- Published: 2021-01-21
- Granted: 2024-02-13
- Earliest claimed: 2019-01-02
- Assignees: Seoul National University R&Db Foundation
- Applicants: Seoul National University R&Db Foundation
- Inventors: Maeng Hyo Cho; Hee Jun Sung; Hong Seok Kim; Hyun Su Kim
- Web page: https://patentgrep.com/patent/US11897184B2

## CPC

- B29C 59/16: by wave energy or particle radiation {, e.g. infrared heating (B29C59/007 takes precedence)}
- B29C 61/00: Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor (for surface shaping B29C59/18; for lining articles B29C63/38; for joining preformed parts B29C65/66 {; for packaging B65B53/00; connecting arrangements or other fittings for plastics pipes using shrink-down material F16L47/22, electrical connections insulated using heat shrinking insulating sleeves H01R4/72; cable junctions protected by sleeves H02G15/18})
- B29C 59/02: by mechanical means, e.g. pressing {(B29C59/007 takes precedence; embossing expanded porous articles B29C44/5627)}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 38/0008: {Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation (heat treatment B32B38/0036)}
- C09K 19/38: Polymers
- C09K 19/54: Additives having no specific mesophase {characterised by their chemical composition}
- B29C 53/04: of plates or sheets {(B29C63/04 takes precedence; bending or folding paper B31F1/0003; folding films B65H45/00)}
- B29C 2035/0827: {using UV radiation}
- B29C 2035/0838: {using laser}
- B32B 2250/04: 4 layers
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2305/55: Liquid crystals
- B32B 2307/40: having particular optical properties
- B32B 2307/738: Thermoformability
- B32B 2310/0831: using UV radiation
- B32B 2535/00: Medical equipment, e.g. bandage, prostheses or catheter
- C09K 2219/03: in the form of films, e.g. films after polymerisation of LC precursor
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The present invention relates to a photo-responsive shape-changing structure and a driving method thereof. The photo-responsive shape-changing structure (100) is characterized in that it includes a first body portion (200) including at least one polymer film that undergoes a bending deformation in response to light irradiation, a second body portion (300) including at least one polymer film that undergoes a bending deformation in response to light irradiation, and a connection portion (400) configured to allow the first body portion (200) and the second body portion (300) to be connected to each other, wherein adhesive support portions (500, 600) are formed at one ends of the first body portion (200) and the second body portion (300), which are in contact with the ground (20).

## Claims

### Claim 1

A photo-responsive shape-changing structure comprising:
a first body portion comprising at least one polymer film that undergoes a bending deformation in response to light irradiation;
a second body portion comprising at least one polymer film that undergoes a bending deformation in response to light irradiation; and
a connection portion configured to allow the first body portion and the second body portion to be connected to each other,
wherein adhesive support portions are formed at one ends of the first body portion and the second body portion, which are in contact with the ground.

### Claim 2 (depends on 1)

The photo-responsive shape-changing structure of claim 1, wherein the first body portion comprises a 1-1 polymer film and a 1-2 polymer film that each undergo a bending deformation in response to light irradiation and the second body portion comprises a 2-1 polymer film and a 2-2 polymer film that each undergo a bending deformation in response to light irradiation.

### Claim 3 (depends on 2)

The photo-responsive shape-changing structure of claim 2, wherein a first restricting portion is formed between the 1-1 polymer film and the 1-2 polymer film and a second restricting portion is formed between the 2-1 polymer film and the 2-2 polymer film.

### Claim 4 (depends on 1)

The photo-responsive shape-changing structure of claim 1, wherein the polymer film comprises a polymer scaffold film, an azobenzene liquid crystal polymer applied on a surface of the polymer scaffold film by immersing the film in the polymer, and a protective film attached to a surface of the azobenzene liquid crystal polymer.

### Claim 5 (depends on 1)

The photo-responsive shape-changing structure of claim 1, wherein an adhesive strength between the adhesive support portions and the ground is less than a force that causes bending deformation of the polymer film upon light irradiation.

### Claim 6 (depends on 1)

The photo-responsive shape-changing structure of claim 1, wherein the connection portion connects the other ends of the first body portion and the second body portion to each other and acts as a joint to allow for bending or twisting deformation of the first body portion and the second body portion.

### Claim 7 (depends on 1)

The photo-responsive shape-changing structure of claim 1, wherein the first body portion and the second body portion are provided in plurality.