# US 10,481,383 B2 · Endoscopic optical system

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- Number: US 10,481,383 B2
- Document ID: US10481383B2
- Status: Granted
- Kind: B2
- Application number: 15/541,735
- Filed: 2015-12-16
- Published: 2018-01-25
- Granted: 2019-11-19
- Earliest claimed: 2015-01-09
- Assignees: Olympus Winter & Ibe GmbH
- Applicants: Olympus Winter & Ibe GmbH
- Inventors: Gregor Kiedrowski; Peter Schouwink
- Web page: https://patentgrep.com/patent/US10481383B2

## CPC

- G02B 23/2407: {Optical details}
- A61B 1/0011: {Manufacturing of endoscope parts}
- A61B 1/0017: {Details of single optical fibres, e.g. material or cladding}
- A61B 1/00186: {with imaging filters}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- G02B 23/243: {Objectives for endoscopes}
- G02B 23/2476: {Non-optical details, e.g. housings, mountings, supports}
- G02B 23/26: using light guides {(for illumination G02B23/2469)}
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B 27/1066: {for enhancing image performance, like resolution, pixel numbers, dual magnifications or dynamic range, by tiling, slicing or overlapping fields of view}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An endoscopic optical system including: a fiber image conductor arranged in an elongated shaft tube, the fiber image conductor having a proximal face; an objective arranged distally relative to the fiber image conductor; an observation device arranged proximally relative to the proximal face of the fiber image conductor; a mask; and a transparent cover pane arranged between the proximal face of the fiber image conductor and the observation device; wherein the transparent cover pane is configured as a moire filter.

## Claims

### Claim 1

An endoscopic optical system comprising:
a fiber image conductor arranged in an elongated shaft tube, the fiber image conductor having a proximal face;
an objective arranged distally relative to the fiber image conductor;
an observation device arranged proximally relative to the proximal face of the fiber image conductor;
a mask formed of metal; and
a transparent cover pane arranged between the proximal face of the fiber image conductor and the observation device;
wherein the transparent cover pane is configured as a moire filter; and
the mask is a metal vapor deposition layer on a distal face of the moire filter and attached to the image conductor via an adhesive.

### Claim 2 (depends on 1)

The endoscopic optical system according to claim 1, wherein the moire filter comprises a plurality of birefringent layers, each of the plurality of birefringent layers being arranged parallel to the distal face of the moire filter, the plurality of birefringent layers being arranged so as to produce blurring in different directions parallel to the distal face.

### Claim 3 (depends on 2)

The endoscopic optical system according to claim 2, wherein the plurality of birefringent layers comprises three birefringent layers.

### Claim 4 (depends on 1)

The endoscopic optical system according to claim 1, further comprising an adhesive disposed on the distal face of the moire filter to adhere the proximal face of the fiber image conductor to the distal face of the moire filter.