# US 11,432,711 B2 · Endoscope

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- Number: US 11,432,711 B2
- Document ID: US11432711B2
- Status: Granted
- Kind: B2
- Application number: 16/864,369
- Filed: 2020-05-01
- Published: 2020-08-13
- Granted: 2022-09-06
- Earliest claimed: 2017-12-21
- Assignees: Olympus Corporation
- Applicants: Olympus Corporation
- Inventors: Toyohiro Kondo
- Web page: https://patentgrep.com/patent/US11432711B2

## CPC

- A61B 1/041: {Capsule endoscopes for imaging}
- A61B 1/00174: {characterised by the viewing angles}
- A61B 1/00188: {with focusing or zooming features}
- A61B 1/00197: {characterised by multiple eyepieces}
- A61B 1/0684: {using light emitting diodes [LED]}
- G02B 13/24: for reproducing or copying at short object distances
- G02B 23/243: {Objectives for endoscopes}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An endoscope includes an objective optical system, an illuminator having a light-emitting region and the illuminator disposed at a position different from the objective optical system, and a dome-shaped transparent cover transparent in a range of field of view and sealing the object side of the objective optical system and the illuminator. The following Conditional Expressions (1) and (2) are satisfied: 0.5<θ/ω<0.95 (1), (−0.13×LP+0.86×DR)<DL<0.95×DR (2).

## Claims

### Claim 1

An endoscope comprising:
an objective optical system;
an illuminator having a light-emitting region and the illuminator disposed at a position different from the objective optical system; and
a dome-shaped transparent cover transparent in a range of field of view and sealing an object side of the objective optical system and the illuminator, wherein
the following Conditional Expressions (1) and (2) are satisfied:
0.5<θ/ω<0.95 (1)
(−0.13×LP+0.86×DR)<DL<0.95×DR (2)
where
ω is a half angle of view of the objective optical system,
θ is an angle formed by a straight line and an optical axis of the objective optical system when an intersection point of a light ray at the half angle of view and an inner surface of the dome-shaped transparent cover is connected to a spherical core position of the dome-shaped transparent cover by the straight line,
LP is a distance from an entrance pupil position of the objective optical system to the light-emitting region,
DR is a radius of curvature of the inner surface of the dome-shaped transparent cover, and
DL is a distance from the inner surface of the dome-shaped transparent cover to the entrance pupil position of the objective optical system on the optical axis.

### Claim 2 (depends on 1)

The endoscope according to claim 1, wherein the endoscope is a capsule endoscope.