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:
Jul. 28, 2020
Filed:
Jan. 31, 2017
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Yukitaka Dodo, Tokyo, JP;
Koji Ono, Tokyo, JP;
Shinji Shimomura, Tokyo, JP;
Ichiro Shibagaki, Tokyo, JP;
USHIO DENKI KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A light source unit includes a light distribution lens configured to guide light emitted from an LED disposed behind the light distribution lens, and a reflector arranged to surround the light distribution lens. Illuminance unevenness can be more suitably reduced, and effective light is not blocked even if a pinhole device is used for glare prevention, thereby avoiding illuminance unevenness and illuminance reductions. The light distribution lens has a columnar part that extends in the optical axis direction, and a conical recess is formed in the distal end of the columnar part. The conical recess is constituted by a reflective surface that fully reflects, in the circumferential direction, light incident on the light distribution lens. The reflector reflects light emitted from a cylindrical side surface of the columnar part such that the reflected light becomes converging light.