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. 08, 2025
Filed:
Mar. 24, 2022
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Yoshio Matsumura, Osaka, JP;
Hiroyuki Shobayashi, Hyogo, JP;
Takuya Imaoka, Kanagawa, JP;
Tomoko Iiyama, Osaka, JP;
Abstract
A lens system includes lens elements and a diaphragm. The lens elements include freeform lenses each having a freeform surface asymmetrical with respect to first and second directions. At least one freeform lens is placed on the image plane side of the diaphragm. The lens system satisfies a following conditional expression (1); where N: a total number of the freeform surfaces on the object side of the diaphragm, k: a number indicating a freeform surface among the N freeform surfaces, SAG1, SAG2: a sag amount at a position where a height of a k-th freeform surface in the first or second direction is 40% of an image height in the first direction, Y2: an image height in the second direction, Θ1: a full angle of view in the first direction, and Δnd: a difference between refractive indexes on the both sides of the k-th freeform surface.