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公开(公告)号：US20180003970A1
公开(公告)日：2018-01-04
申请号：US15630218
申请日：2017-06-22
Inventor： Sosuke OTANI , Yoshimasa FUSHIMI
IPC: G02B27/01
CPC classification number: G02B27/0101 , G02B27/0149 , G02B2027/011 , G02B2027/0145 , G02B2027/015
Abstract: A head-up display causes light modulated by an optical modulation element to form, via a projection lens, an intermediate image on a screen, and then causes the intermediate image to reflect, via a mirror, on a windshield to allow a user to view a virtual image. A normal line of the screen is inclined with respect to an optical axis of the projection lens. An emission surface of the optical modulation element is inclined with respect to the screen and a principal plane of the projection lens so as to satisfy a Scheimpflug condition.
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公开(公告)号：US20220141432A1
公开(公告)日：2022-05-05
申请号：US17575132
申请日：2022-01-13
Inventor： Makoto MAEDA , Sosuke OTANI
IPC: H04N9/31
Abstract: This projection display device includes: a light source unit emitting a white light along a first optical axis; a lighting unit provided on a second optical axis, the lighting unit splitting the white light into predetermined color lights and uniformizing an illuminance distribution of the predetermined color lights; an image generator including a display element modulating the predetermined color lights, and a projection lens projecting an image light including the predetermined color lights modulated along a third optical axis; at least one optical path switching unit selectively switching between reflection and transmission of the white light; a light diffuser including a diffusion optical system spreading the white light to a desired illumination area and projecting the spread white light as an illumination light; and a controller causing the at least one optical path switching unit to switch between emission of the image light and emission of the illumination light.
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