When a viewing angle of the image is ± F degrees, an angle between the diffraction structure of the expansion region and a traveling direction of the light flux is α degrees, an inclination angle of the diffraction structure is β degrees, an angle between the center light beam of the light flux incident on the expansion region and the Z axis is θA degrees, an angle between a center light beam of a light flux diffracted and emitted in the expansion region and the Z axis is θB degrees, a thickness of the diffraction structure in a Z direction is T [µm], a shorter interval between the diffraction structure and each of a front surface and a back surface of the light guide body is Ts [µm], and a coherence length of the light flux diffracted and emitted in the expansion region in the light guide body is L [µm], the following relational expression is satisfied. |θA - θB| < | F |/2, | β | × 2 × cos (α) ≤ | F | θA - θB|, and Ts > L/2
OPTICAL SYSTEM AND HEAD-UP DISPLAY SYSTEM PROVIDED WITH SAME
OPTISCHES SYSTEM UND HEAD-UP-ANZEIGESYSTEM DAMIT
SYSTÈME OPTIQUE ET SYSTÈME D'AFFICHAGE TÊTE HAUTE POURVU DE CELUI-CI
2025-01-29
Patent
Electronic Resource
English
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