LAMINATE FILM

• Main Authors: MORISHIMA RYOTA, HATTORI DAISUKE
• Format: Patent
• Language: English; Japanese
• Published: 07.09.2023
• Subjects: LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; TRANSPORTING

To provide a laminate film including an optical functional layer having a light direction conversion function and an adhesive layer protecting the optical functional layer, the laminate film suppressing a functional deterioration of the optical functional layer by the adhesive layer.SOLUTION: A laminate film includes: an optical functional layer having a first principal surface and a second principal surface, with the first principal surface having an irregular structure, in which an irregularity height is 10 nm to 100 μm; a porous layer disposed on the first principal surface of the optical functional layer; and an adhesive layer disposed on a side opposite to the optical functional layer of the porous layer. The optical functional layer is a reflection type hologram film, a microlens array film or a prism film. The porous layer has a refraction index of 1.15 to 1.30.SELECTED DRAWING: Figure 1 【課題】光の方向変換機能を有する光学機能層と光学機能層を保護する粘着剤層とを有し、かつ、粘着剤層による光学機能層の機能低下が抑制されている積層フィルムを提供すること。【解決手段】本発明の実施形態による積層フィルムは、第１主面と第２主面とを有し、第１主面が凹凸構造を有し、凹凸の高さが１０ｎｍ～１００μｍである、光学機能層と；光学機能層の第１主面に設けられた多孔質層と；多孔質層の光学機能層と反対側に設けられた粘着剤層と；を有する。光学機能層は、反射型ホログラムフィルム、マイクロレンズアレイフィルムまたはプリズムフィルムであり、多孔質層の屈折率は１．１５～１．３０である。【選択図】図１