An optical system includes a light guide body. A light flux incident on the light guide body from the display is replicated in a first direction corresponding to a horizontal direction of the image due to diffraction by a diffraction structure of an expansion region, or a second direction corresponding to a vertical direction of the image. When a normal direction with respect to the light guide body of the expansion region is defined as a Z-axis direction, and a tangential plane is defined as an XY plane, and a traveling direction of a center light beam of the light flux incident on the expansion region on the XY plane is defined as an X axis, and a direction perpendicular to the X axis is defined as a Y axis, the diffraction structure of the expansion region is formed such that a light flux duplicated when the light flux incident on the expansion region is transmitted through the XY plane of the expansion region from a positive direction of the Z axis and a light flux duplicated when the light flux is transmitted through the XY plane of the expansion region from a negative direction of the Z axis are accommodated within a viewing angle at which the image is visually recognizable. The diffractive structure of the expansion region is inclined with respect to the Z-axis direction.
OPTICAL SYSTEM AND HEAD-UP DISPLAY SYSTEM COMPRISING SAME
OPTISCHES SYSTEM UND HEAD-UP-ANZEIGESYSTEM DAMIT
SYSTÈME OPTIQUE ET SYSTÈME D'AFFICHAGE TÊTE HAUTE LE COMPRENANT
2025-01-29
Patent
Electronic Resource
English
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