US 6,142,932 AGranted

Front end structure of stereoscopic endoscope including an elongated lens

AssigneeFuji Photo Optical Co., Ltd.

InventorMasaaki Morizumi

Life of this patent

Estimating the term…

Loading patent…

Abstract

A front end lens 11 of a pair of objective lenses 32R, 32L disposed the object-side end face of a front end part 1 of a stereoscopic endoscope has a so-called D-cut lens form in which both side portions of a spherical lens are cut off, whereby spaces for arranging illumination windows 13, lens surface washing nozzles 15, and heads of fastening screws 14 for fastening the front end part 1 to a front end part main body 2 are secured at the front end face of the front end part 1, while keeping its function of yielding a sufficient angle of convergence .theta.. A positioning pin 16 formed in the front end part main body 2 is inserted into a pin insertion groove 17 formed in a protrusion 12 of the front end part 1 at an eccentric position of the protrusion 12, whereby both members 1, 2 are inhibited from rotating relative to each other, and the relative positional relationship between the front end lens 11 and the pair of objective optical systems 32R, 32L can reliably be fixed.

Claims5

Dependent claims

A front end structure of a stereoscopic endoscope in which a pair of objective optical systems are disposed at a front end of an inserting portion, said front end structure comprising:

a pair of lens barrel portions for holding and accommodating said pair of objective optical systems, respectively;
a lens barrel main body for supporting said pair of lens barrel portions such that said lens barrel portions project toward an object;
a front end part main body formed with a pair of insertion holes adapted to receive said pair of lens barrel portions, respectively;
and
a cap-like front end part adapted to mate with an object-side end part of said front end part main body;
wherein a lens for guiding a pair of subject image light beams for right and left eyes to said pair of objective optical systems is disposed at an object-side end face of said front end part, said lens having a form elongated in a direction along which said pair of objective optical systems align with each other in a state where said front end part and said front end part main body mate with each other.

3 more elements

Dependencies are inferred from the claim text.