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. 18, 2023
Filed:
Oct. 01, 2020
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Satoshi Kuzuhara, Osaka, JP;
Hiroaki Okayama, Nara, JP;
Abstract
A head-up display includes a display device and a projection optical system; the projection optical system includes first and second optical elements arranged in order of an optical path from the image; and when optical paths corresponding to an upper end and a lower end of the virtual image are defined as an upper ray and a lower ray, respectively, and a diverging effect and a converging effect are defined as being negative and positive, respectively, the first and the second optical elements satisfy conditional expressions P_u−P_l<0 and P_u−P_l>0 (where P_udenotes a local power of the first optical element acting on the upper ray, P_ldenotes a local power of the first optical element acting on the lower ray, P_udenotes a local power of the second optical element acting on the upper ray, P_ldenotes a local power of the second optical element acting on the lower ray).