Invention Grant
- Patent Title: Illumination device
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Application No.: US14417254Application Date: 2013-07-26
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Publication No.: US09939127B2Publication Date: 2018-04-10
- Inventor: Tatsuo Uchida , Yoshito Suzuki , Tohru Kawakami , Takahiro Ishinabe , Katsunori Ehara , Yoshihiro Hashimoto , Toshiki Matsuoka , Kozo Nakamura , Yasuhisa Itoh , Yoshitaka Yamamoto , Yutaka Ishii , David Montgomery
- Applicant: Sharp Kabushiki Kaisha , TOHOKU UNIVERSITY
- Applicant Address: JP Sakai JP Miyagi
- Assignee: Sharp Kabushiki Kaisha,TOHOKU UNIVERSITY
- Current Assignee: Sharp Kabushiki Kaisha,TOHOKU UNIVERSITY
- Current Assignee Address: JP Sakai JP Miyagi
- Agency: Keating & Bennett, LLP
- Priority: JP2012-167663 20120727; WOPCT/JP2013/068124 20130702
- International Application: PCT/JP2013/070379 WO 20130726
- International Announcement: WO2014/017652 WO 20140130
- Main IPC: F21V5/04
- IPC: F21V5/04 ; F21K99/00 ; G02B19/00 ; F21V5/00 ; F21K9/60 ; F21Y115/10

Abstract:
A lighting device (100) includes: a surface light source (1); a first lens (L1) having a first focal point (F1), the first lens being provided on the light exit surface side of the surface light source; and a second lens (L2) having a second focal point (F2), the second lens being provided on a light exit surface side of the first lens, the surface light source, the first lens, and the second lens being configured such that a first virtual image (I1) is formed by the first lens and a second virtual image (I2) is formed by the second lens, wherein the first virtual image (I1) is formed between the second focal point (F2) and the first lens, and the second focal point (F2) is on a side opposite to the light source side relative to a predetermined focal position f′.
Public/Granted literature
- US20150211709A1 ILLUMINATION DEVICE Public/Granted day:2015-07-30
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