Invention Grant
- Patent Title: Virtual image display device
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Application No.: US15310399Application Date: 2015-03-26
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Publication No.: US10254551B2Publication Date: 2019-04-09
- Inventor: Tomo Kishigami , Hironori Nakahara , Nozomi Nakagawa
- Applicant: MITSUBISHI ELECTRIC CORPORATION
- Applicant Address: JP Tokyo
- Assignee: MITSUBISHI ELECTRIC CORPORATION
- Current Assignee: MITSUBISHI ELECTRIC CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2014-121944 20140613
- International Application: PCT/JP2015/059302 WO 20150326
- International Announcement: WO2015/190157 WO 20151217
- Main IPC: G02B27/01
- IPC: G02B27/01 ; G02B5/30 ; B60K35/00 ; G02B27/28 ; H04N9/31

Abstract:
A virtual image display device includes a light source unit, a polarization switching unit, an image generation unit, an optical path unit and a projection unit. The polarization switching unit switches a polarization direction of a light beam emitted from the light source unit. The optical path unit includes a first optical path through which the light beam having the first polarization direction travels and a second optical path through which the light beam having the second polarization direction travels. A first virtual image is displayed at a first distance with the light beam that has traveled through the first optical path. A second virtual image is displayed at a second distance farther than the first distance with the light beam that has traveled through the second optical path.
Public/Granted literature
- US20170146803A1 VIRTUAL IMAGE DISPLAY DEVICE Public/Granted day:2017-05-25
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