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:
May. 07, 2019
Filed:
Oct. 27, 2015
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;
Seiji Murata, Tokyo, JP;
Keiichi Betsui, Tokyo, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Ibaraki, JP;
Abstract
Provided is a technology which is suitable for both widening an image capture view angle and securing an angular resolution across the entire image capture range. In an imaging optical system, a rate of change of an image height per view angle, i.e. dy/dθ, is greater than 0 at a maximum view angle θmax, a rate of change of a view angle per image height, i.e. D(θ)=1/(dy(θ)/dθ), satisfies an expression D(θp)>{(D(θmax)−D(0))/θmaxθ}θp+D(0), with θp which lies in a range of 0<θ<θmax, and it satisfies an expression 1.5<(y(θs)/θs)/{(y(θmax)−y(θs))/(θmax−θs)}<3.0 with a switching view angle θs of the rate of change D(θ) of the view angle per image height.