Patent ID: 11947142
Assignee: FUJIFILM CORPORATION
Field: Optics (Instruments)
Classification: CPC G  H | IPC G

Claim 0:
1. An elongated optical film comprising, in the following order:
an optically anisotropic layer (A);
an optically anisotropic layer (B); and
an optically anisotropic layer (C),
wherein the optically anisotropic layer (A) is a layer formed by fixing a vertically aligned disk-like liquid crystal compound,
the optically anisotropic layer (B) is a layer formed by fixing a twist-aligned rod-like liquid crystal compound with a thickness direction as a helical axis,
the optically anisotropic layer (C) is a layer formed by fixing a vertically aligned rod-like liquid crystal compound,
an in-plane slow axis of the optically anisotropic layer (A) is parallel to an in-plane slow axis on a surface of the optically anisotropic layer (B) on an optically anisotropic layer (A) side,
upon being observed from an optically anisotropic layer (C) side toward the optically anisotropic layer (A) side, in a case where the in-plane slow axis of the optically anisotropic layer (A) rotates clockwise with reference to a longitudinal direction of the elongated optical film, an in-plane slow axis on a surface of the optically anisotropic layer (B) opposite to the optically anisotropic layer (A) side rotates counterclockwise with reference to the in-plane slow axis on the surface of the optically anisotropic layer (B) on the optically anisotropic layer (A) side, and
upon being observed from the optically anisotropic layer (C) side toward the optically anisotropic layer (A) side, in a case where the in-plane slow axis of the optically anisotropic layer (A) rotates counterclockwise with reference to the longitudinal direction of the elongated optical film, the in-plane slow axis on the surface of the optically anisotropic layer (B) opposite to the optically anisotropic layer (A) side rotates clockwise with reference to the in-plane slow axis on the surface of the optically anisotropic layer (B) on the optically anisotropic layer (A) side.