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:
Dec. 07, 2021
Filed:
Dec. 10, 2018
Nittoh Inc., Suwa, JP;
Kenji Iijima, Nagano, JP;
NITTOH INC., Suwa, JP;
Abstract
An optical system includes: a first lens group with negative refractive power at an object side of an aperture stop; a second lens group with positive refractive power at an image plane side of the aperture stop; and a third lens group with positive refractive power at the image plane side of the second lens group. The first lens group includes a first lens with negative refractive power and concave image plane side, a second lens of meniscus type, with negative refractive power, and convex image plane side, and a third lens with positive refractive power and convex object side. The second lens group includes a fourth lens with positive refractive power and convex image plane side; a fifth lens of meniscus type, with negative refractive power, and convex object side; and a sixth lens with negative refractive power and concave object side.