Patent ID: 11860338
Assignee: FUJIFILM CORPORATION
Field: Optics (Instruments)
Classification: CPC C  G  H | IPC C  G  H

Claim 0:
1. An optical film comprising:
a resin substrate having an alignment regulating force; and
an optically anisotropic layer arranged on the resin substrate,
wherein the optically anisotropic layer contains a liquid crystal compound and a compound having a heteroatom different from the liquid crystal compound, and
in a case where a surface of the optical film on an optically anisotropic layer side thereof is defined as a first surface and a surface of the optical film on a resin substrate side thereof is defined as a second surface, and components of the optical film in a depth direction are analyzed by time-of-flight secondary ion mass spectrometry while irradiating the optical film with an ion beam from the first surface toward the second surface, the optical film satisfies both the following Requirement 1 and Requirement 2,
Requirement 1: the optical film exhibits a maximum value Imax of a secondary ionic intensity derived from the compound having a heteroatom at any depth position between an A position and a B position, in a case where a depth position located closest to the second surface showing a secondary ion intensity, which is 80% of a maximum intensity of a secondary ion intensity derived from the liquid crystal compound, is defined as the A position, and a depth position located closest to the first surface showing a secondary ion intensity, which is 80% of a maximum intensity of a secondary ion intensity derived from a resin constituting the resin substrate, is defined as the B position, and
Requirement 2: a distance between a C position and a D position is 100 nm or less, in a case where a depth position which shows a maximum value Imax of a secondary ion intensity derived from the compound having a heteroatom is defined as a peak position, a depth position which shows a secondary ion intensity that is half of the maximum value Imax, is closer to the first surface side than the peak position, and is closest to the peak position is defined as the C position, and a depth position which shows a secondary ion intensity that is half of the maximum value Imax, is closer to the second surface side than the peak position, and is closest to the peak position is defined as the D position.