Capsule type endoscope
US7153259B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2004 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Mar 25, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B1/0684
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A capsule type endoscope includes an illumination device, an imaging device, and a transparent cover covering the illumination device and the imaging device. The imaging device has an objective optical system and an image sensor. When the objective optical system satisfies Condition (1) described below and a white cylinder with a reflectance of 90%, satisfying Condition (3) described below, is observed, illuminance of the imaging surface of the image sensor satisfies Condition (2) described below, in a state where a longitudinal center axis of a capsule coincides with the center axis of the white cylinder with a reflectance of 90%.ω≧50° (1)T1×0.5≦T2 (2)D=1.2×Φ (3)where ω is a half of a field angle of the objective optical system, T1 is the maximum illuminance in an area on the imaging surface of the image sensor corresponding to a field region of the objective optical system, T2 is illuminance at a position on the imaging surface of the image sensor corresponding to a half of the maximum image height of the objective optical system, D is the inside diameter of the white cylinder, and Φ is the outside diameter of the capsule type endoscope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.