# US 10,310,147 B2 · Optical assembly and the method to make the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,310,147 B2 - Document ID: US10310147B2 - Status: Granted - Kind: B2 - Application number: 15/803,826 - Filed: 2017-11-05 - Published: 2018-03-01 - Granted: 2019-06-04 - Earliest claimed: 2016-03-01 - Assignees: Ubright Optronics Corporation - Applicants: Ubright Optronics Corporation - Inventors: Hui-Yong Chen; Yi-Long Tyan - Web page: https://patentgrep.com/patent/US10310147B2 ## CPC - G02B 5/0231: {the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045)} - C08L 33/06: of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical - C08L 33/08: Homopolymers or copolymers of acrylic acid esters - C09J 133/06: of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical - C09J 133/08: Homopolymers or copolymers of acrylic acid esters - G02B 5/02: Diffusing elements; Afocal elements - G02B 5/0205: {characterised by the diffusing properties} - G02B 5/021: {the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures} - G02B 5/0268: {characterized by the fabrication or manufacturing method} - G02B 5/0278: {used in transmission} - C08L 2312/00: Crosslinking - C08L 2312/06: by radiation - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) ## Abstract The present invention discloses an optical assembly. The optical assembly comprises: a first optical film comprising a first surface; an adhesive disposed on the first surface of the first optical film; and a second optical film comprising a second surface, wherein the second surface of the second optical film comprises a plurality of microstructures, wherein the plurality of microstructures are bonded to the adhesive; wherein the adhesive is made of a first material and the plurality of microstructures are made of a second material, wherein the hydrophilic/hydrophobic characteristic of the first material is configured with respect to the hydrophilic/hydrophobic characteristic of the second material such that the adhesive force between the adhesive and the plurality of microstructures of the second optical film is greater than 100 g/25 mm and the optical gain of the optical assembly is greater than 1.5. ## Claims ### Claim 1 A method of forming an optical assembly, comprising: providing a first optical film comprising a first surface; forming an adhesive layer on the first surface of the first optical film, wherein the adhesive layer is made of a first material; providing a second optical film comprising a second surface, wherein the second surface of the second optical film comprises a plurality of prisms, wherein the plurality of prisms are made of a second material; and bonding the plurality of prisms to the adhesive layer by controlling a difference between the surface tension of the first material and the surface tension of the second material, wherein the difference is greater than 3 dyne/cm such that the adhesive force between the adhesive layer and the plurality of prisms is greater than 100 g/25 mm and the optical gain of the optical assembly is greater than 1.5 when the first material and the second material are fully cured. ### Claim 2 (depends on 1) The method according to claim 1, wherein the plurality of prisms penetrate into the adhesive layer. ### Claim 3 (depends on 1) The method according to claim 1, wherein each of the plurality of prisms has a light directing portion and a bonding portion bonded to the adhesive layer, wherein the light directing portion has two intersecting extending-planes defining a first dihedral angle and the bonding portion has two intersecting planes defining a second dihedral angle, wherein the second dihedral angle is substantially equal to the first dihedral angle. ### Claim 4 (depends on 1) The method according to claim 1, wherein the first material is a hydrophilic material and the second material is a hydrophobic material. ### Claim 5 (depends on 1) The method according to claim 1, wherein the first material is a hydrophobic material and the second material is a hydrophilic material. ### Claim 6 An optical assembly, comprising: a first optical film comprising a first surface; an adhesive layer formed on the first surface of the first optical film; and a second optical film comprising a second surface, wherein the second surface of the second optical film comprises a plurality of microstructures, wherein the plurality of microstructures are bonded to the adhesive layer; wherein the adhesive layer is made of a first material and the plurality of microstructures are made of a second material, wherein the surface tension of the first material and the surface tension of the second material have a difference for bonding the plurality of microstructures to the adhesive layer, wherein the difference is greater than 3 dyne/cm such that the adhesive force between the adhesive layer and the plurality of microstructures of the second optical film is greater than 100 g/25 mm and the optical gain of the optical assembly is greater than 1.5 when the first material and the second material are fully cured. ### Claim 7 (depends on 6) The optical assembly according to claim 6, wherein the plurality of microstructures penetrate into the adhesive layer. ### Claim 8 (depends on 6) The optical assembly according to claim 6, wherein each of the plurality of microstructures has a light directing portion and a bonding portion bonded to the adhesive layer, wherein the light directing portion has two intersecting extending-facets defining a first dihedral angle and the bonding portion has two intersecting facets defining a second dihedral angle, wherein the first dihedral angle is substantially equal to the second dihedral angle. ### Claim 9 (depends on 6) The optical assembly according to claim 6, wherein each of the plurality of microstructures has a light directing portion and a bonding portion bonded to the adhesive layer, wherein the light directing portion has two intersecting extending-planes defining a first dihedral angle and the bonding portion has two intersecting planes defining a second dihedral angle, wherein the second dihedral angle is substantially equal to the first dihedral angle. ### Claim 10 (depends on 6) The optical assembly according to claim 6, wherein the first material is a hydrophilic material and the second material is a hydrophobic material. ### Claim 11 (depends on 6) The optical assembly according to claim 6, wherein the first material is a hydrophobic material and the second material is a hydrophilic material.