Invention Grant
- Patent Title: Virtual image projection device
-
Application No.: US16754839Application Date: 2018-10-30
-
Publication No.: US11543648B2Publication Date: 2023-01-03
- Inventor: Seiji Murata , Ryuji Ukai , Tomoto Kawamura , Toshiteru Nakamura
- Applicant: Hitachi-LG Data Storage, Inc.
- Applicant Address: JP Tokyo
- Assignee: Hitachi-LG Data Storage, Inc.
- Current Assignee: Hitachi-LG Data Storage, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Mattingly & Malur, PC
- Priority: JPJP2017-231373 20171201
- International Application: PCT/JP2018/040242 WO 20181030
- International Announcement: WO2019/107044 WO 20190606
- Main IPC: G02B25/00
- IPC: G02B25/00 ; G02B13/18 ; H04N9/31

Abstract:
There is provided a highly efficient virtual image projection device in a small size that displays images of high luminance in which an illumination system is reduced in size with no degradation in an effective luminous light beam. A virtual image projection device that shows video to a human eye includes a virtual light source surface (116) that emits a light beam in a predetermined angular distribution, an image forming lens (117) that condenses the light beam from the virtual light source surface (116), and a display (120) that creates video. When the virtual light source surface (116) is disposed at a nearly focal position on the front side of the image forming lens (117), the display (120) is disposed at a nearly focal position on the rear side of the image forming lens.
Public/Granted literature
- US20210149183A1 VIRTUAL IMAGE PROJECTION DEVICE Public/Granted day:2021-05-20
Information query