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US 11,432,711 B2Granted
Endoscope
AssigneeOlympus Corporation
InventorToyohiro Kondo
Life of this patent
Estimating the term…
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).
Claims2
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.
10 more elements
Dependencies are inferred from the claim text.