Patent · US Active

Eyepiece lens, observation apparatus, and imaging apparatus including the same

US10761313B2 · kind B2 · utility

0Cited by
9References
10Claims
0Family size

Assignee

Inventors

Key dates

Filing dateAug 21, 2015
Grant dateSep 1, 2020
Priority date—
Expiry dateNov 23, 2037

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B25/001
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

One or more eyepiece lenses, one or more observation apparatuses and one or more imaging apparatuses are discussed herein. In at least one embodiment, an eyepiece lens comprises, in order from an object side to an observation side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power, wherein a focal length of the fifth lens is shorter than a focal length of the third lens, and the focal length of the third lens is shorter than a focal length of the first lens.

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