The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2018
Filed:
Jul. 26, 2013
Sharp Kabushiki Kaisha, Osaka-shi, Osaka, JP;
Tohoku University, Sendai-shi, Miyagi, JP;
Tatsuo Uchida, Sendai, JP;
Yoshito Suzuki, Sendai, JP;
Tohru Kawakami, Sendai, JP;
Takahiro Ishinabe, Sendai, JP;
Katsunori Ehara, Sendai, JP;
Yoshihiro Hashimoto, Osaka, JP;
Toshiki Matsuoka, Osaka, JP;
Kozo Nakamura, Osaka, JP;
Yasuhisa Itoh, Osaka, JP;
Yoshitaka Yamamoto, Osaka, JP;
Yutaka Ishii, Osaka, JP;
David Montgomery, Oxford, GB;
Sharp Kabushiki Kaisha, Sakai, JP;
TOHOKU UNIVERSITY, Miyagi, JP;
Abstract
A lighting device () includes: a surface light source (); a first lens (L) having a first focal point (F), the first lens being provided on the light exit surface side of the surface light source; and a second lens (L) having a second focal point (F), 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 (I) is formed by the first lens and a second virtual image (I) is formed by the second lens, wherein the first virtual image (I) is formed between the second focal point (F) and the first lens, and the second focal point (F) is on a side opposite to the light source side relative to a predetermined focal position f'.