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:
Jan. 12, 2021
Filed:
Dec. 07, 2017
Konica Minolta, Inc., Tokyo, JP;
Naoki Hirose, Hachioji, JP;
Konica Minolta, Inc., Tokyo, JP;
Abstract
An observation optical systemis provided with an objective optical system LO, an inversion optical system PR provided in the objective optical system LO or immediately posterior to the objective optical system LO to invert an inverted image to an erected image, and an eyepiece optical system LE arranged so as to be the closest to a pupil EP to observe the erected image, the observation optical system satisfying following conditional expressions 1.6<f×N/L<2.5 . . . (1) and |D/H|<3 . . . (2) Herein, a value f represents a focal length of the objective optical system LO, a value N represents a refractive index on a d-line of the inversion optical system PR, a value L represents an optical path length of the inversion optical system PR, a value D represents a maximum height from an optical axis AX in an incident light ray on the object side of the inversion optical system PR, and a value H represents an exit pupil radius.