Patent · US Expired

Endoscope objective optical system

US6618205B2 · kind B2 · utility

68Cited by
7References
9Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMay 13, 2002
Grant dateSep 9, 2003
Priority date—
Expiry dateMay 13, 2022

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B23/243
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

An endoscope objective optical system includes a negative first lens group, a positive second lens group, and an imaging device, in this order from the object. Zooming is performed by moving the positive second lens group in the optical axis direction, and the endoscope objective optical system satisfies the following condition:m2T<m2W<&#8722;1&#8195;&#8195;(1) whereinm2T designates the lateral magnification of the second lens group at the long focal length extremity, andm2W designates the lateral magnification of the second lens group at the short focal length extremity.

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