Patent · US Active

Optical system, optical apparatus and method for manufacturing the optical system, and zoom optical system, optical apparatus and method for manufacturing the zoom optical system

US12313826B2 · kind B2 · utility

0Cited by

3References

20Claims

0Family size

Assignee

NIKON CORPORATION · JP

Inventors

Masashi Yamashita · Osaka, JP
Tomoki Ito · Kawasaki, JP
Tomonori Kuribayashi · Yokohama, JP
Keigo Koida · Kawasaki, JP
Satoshi Miwa · Wako, JP
Yoko Komatsubara · Tokyo, JP
Katsuya Watanabe · Ozu, JP
Azuna NONAKA · Yokohama, JP
Ayumu Makida · Kawaguchi, JP

Key dates

Filing date	Aug 26, 2020
Grant date	May 27, 2025
Priority date	—
Expiry date	Sep 2, 2040

Classification

Technology area (CPC G)Physics
CPC primaryG02B15/1461
WIPO fieldOptics
WIPO sectorInstruments

Abstract

This optical system (LS) has an aperture diaphragm (S) and a negative lens (L4) disposed closer to an object side than the aperture diaphragm (S) and satisfies the following conditional expression. −0.010<ndN1−(2.015−0.0068×νdN1),50.00<νdN1<65.00, 0.545<θgFN1,−0.010<θgFN1−(0.6418−0.00168×νdN1).Where, ndN1 is a refractive index of the negative lens with respect to a d-line,

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.