OPTICAL SYSTEM AND HEAD-UP DISPLAY SYSTEM PROVIDED WITH SAME

WIPO Patent Application WO/2023/007862

A1

In the present invention, a luminous flux incident on an optical waveguide is reproduced in a first direction corresponding to the horizontal direction of an image, or a second direction corresponding to the vertical direction, by diffraction due to a diffractive structure of an expansion region. The following relational expressions are satisfied, where the viewing angle of the image is ±F degrees, the angle between the diffractive structure and the travel direction of the luminous flux is α degrees, the inclination angle of the diffractive structure is β degrees, the angle between a Z-axis and the central light beam of the luminous flux incident on the expansion region is θA degrees, the angle between the Z-axis and the central light beam of a luminous flux diffracted by the expansion region and emitted is θB degrees, T [µm] is the thickness in the Z-direction of the diffractive structure, Ts [µm] is the smaller of the intervals between the diffractive structure and the front surface of the optical waveguide and the back surface of the optical waveguide, and L [µm] is the coherence length in the optical waveguide of the luminous flux diffracted by the expansion region and emitted. |θA – θB| < |F|/2, |β| × 2 × cos(α) ≤ |F| - |θA – θB|, and Ts > L/2.

MINAMI KAZUHIRO
KUZUHARA SATOSHI
SHOBAYASHI HIROYUKI

PCT/JP2022/016179

February 02, 2023

March 30, 2022

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PANASONIC IP MAN CO LTD (JP)

G02B27/01; B60K35/00; G02B5/18; G02B5/32

WO2018198587A1

2018-11-01

JP2019184920A	2019-10-24
US20200264429A1	2020-08-20
US20200257065A1	2020-08-13
US20200341280A1	2020-10-29
JP2020521170A	2020-07-16
US10429645B2	2019-10-01

YAMAO, Norihito et al. (JP)

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