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:
Nov. 10, 2020
Filed:
Nov. 15, 2018
Stanley Electric Co., Ltd., Tokyo, JP;
Nalux Co., Ltd., Osaka, JP;
Hiroaki Kurosu, Tokyo, JP;
Kayuri Kinoshita, Tokyo, JP;
Kouei Hatade, Osaka, JP;
Norihisa Sakagami, Osaka, JP;
Stanley Electric Co., Ltd., Tokyo, JP;
Nalux Co., Ltd., Osaka, JP;
Abstract
The projector-type headlamp comprises a projection lens unit and a light source unit. A diffraction grating designed to eliminate chromatic aberrations is provided on at least part of a lens surface of the lens unit. When an x axis in the horizontal direction and a y axis in the vertical direction are defined on a plane perpendicular to the optical axis, Ris the maximum y coordinate on the lens surface, and 0≤A<1, an area of the lens surface in which y<A·Rcomprises a curved surface or a flat surface, at least partially provided with the diffraction grating, and an area of the lens surface in which y≥A·Rcomprises a separate curved surface that has a power greater than the power of the curved surface or flat surface, and is not provided with a diffraction grating.