OPTICAL ELEMENT FOR FINGERPRINT AUTHENTICATION

• Main Authors: ZHANG YUANJING, ISOBE SHINGO
• Format: Patent
• Language: English; Korean
• Published: 15.09.2023
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; CALCULATING; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPUTING; CORRECTING FLUIDS; COUNTING; DYES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FILLING PASTES; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PHYSICS; POLISHES; SEMICONDUCTOR DEVICES; USE OF MATERIALS THEREFOR; WOODSTAINS

Provided are an optical element for fingerprint authentication, having a light-transmitting spacer layer formed together with a substrate, a photodiode, and a microlens while inhibiting warpage, having excellent chemical and solvent resistance, and having sufficient thickness, a method for manufacturing the optical element for fingerprint authentication, and a method for manufacturing a thermosetting composition suitably used for manufacturing the optical element for fingerprint authentication. In the optical element for fingerprint authentication including a substrate, a photodiode, a microlens, and a light-transmitting spacer, the light-transmitting spacer layer is composed of a cured thermosetting composition containing an acrylic resin, the solid content concentration of the thermosetting composition is greater than 30 mass%, as acrylic resins, resins that contain the constituent unit (I), which is a phenolic hydroxyl group-containing (meth)acrylic unit, and the constituent unit (II), which is an epoxy group-containing (meth)acrylic unit, each with a predetermined structure, in a predetermined ratio, are used. [과제] 기판, 포토다이오드, 및 마이크로렌즈와, 함께, 휨을 억제하면서 형성되고, 내약품성이나 내용제성이 뛰어나고, 또한 충분한 두께를 가지는 투광성 스페이서층을 가지는, 지문 인증용 광학 소자와, 당해 지문 인증용 광학 소자의 제조 방법, 및 당해 지문 인증용 광학 소자의 제조에 적합하게 이용되는 열경화성 조성물의 제조 방법을 제공하는 것. [해결 수단] 기판, 포토다이오드, 마이크로렌즈, 및 투광성 스페이서를 구비하는 지문 인증용 광학 소자에 있어서, 투광성 스페이서층을, 아크릴 수지를 포함하는 열경화성 조성물의 경화물에 의해 구성하고, 열경화성 조성물의 고형분 농도를 30 질량% 초과로 하고, 아크릴 수지로서, 각각 소정의 구조의, 페놀성 수산기 함유 (메타)아크릴 단위인 구성 단위(I)와, 에폭시기 함유 (메타)아크릴 단위인 구성 단위(II)를 소정의 비율로 포함하는 수지를 이용한다.