PROJECTION OPTICAL SYSTEM AND SPECTACLE-TYPE TERMINAL

WIPO Patent Application WO/2024/033968

A1

A projection optical system (50) according to the present invention comprises: a projection substrate (100) that has an optical waveguide part (200) and is designed to project image light onto a second surface on the reverse side from a first surface while transmitting at least part of light incident from the first surface to the second surface; and a diffracted light reducing plate (310) that is provided on the first surface side of the projection substrate (100) with an air layer interposed therebetween with respect to the optical waveguide part (200), covers at least part of the optical waveguide part (200), and reduces diffracted light traveling in a direction in which the image light is emitted by incident light incident at a predetermined incident angle from the first surface of the projection substrate (100) being diffracted by the optical waveguide part (200). The optical waveguide part (200) guides at least part of projection light for projecting the image light and emits, from the second surface, the at least part of the projection light as the image light.

SHOZU TOSHIAKI (JP)
TATEOKA SUSUMU (JP)
INABATA TATSUO (JP)
SHIRAGA SATOSHI (JP)
OGURA SHOTARO (JP)

PCT/JP2022/030271

February 15, 2024

August 08, 2022

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CELLID INC (JP)

G02B27/02; H04N5/64; H04N13/344

WO2013111471A1	2013-08-01
WO2021106749A1	2021-06-03

JP2021508093A	2021-02-25
JP2014222302A	2014-11-27
CN210776045U	2020-06-16

IZUMI Michihiro (JP)

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