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:
Apr. 26, 2022
Filed:
May. 25, 2018
Nittoh Inc., Suwa, JP;
Akira Sawamoto, Nagano, JP;
NITTOH INC., Suwa, JP;
Abstract
An optical system () for image pickup includes a first refractive optical system (Si) disposed on an object side with respect to an aperture stop (St) and a second refractive optical system (S) disposed on an image plane side with respect to the aperture stop. The first refractive optical system includes, in order from the object side (), a first lens group (G) with positive refractive power, a second lens group (G) with positive refractive power, and a third lens group (G) with negative refractive power. The second refractive optical system includes, in order from the object side (), a fourth lens group (G) with positive refractive power, a fifth lens group (G) with positive refractive power, and a sixth lens group (G) with negative refractive power. When focusing from infinity to a short distance, the second lens group and the fourth lens group move toward the object side.