Optical system for endoscopes
AssigneeOlympus Optical Co., Ltd.
InventorSusumu Takahashi
Life of this patent
Estimating the term…
Abstract
In order to facilitate accommodation into a narrow space and enable to reserve an observation range wider than those conventionally available while assuring high reliability and brightness sufficient for practical use, the optical system for endoscopes comprises a stop capable of varying aperture into plural number of shapes and/or sizes, and a lens system arranged in the vicinity of said stop and designed in such a manner that the lens surface portions corresponding to the varied stop apertures and sizes have focal length different from each other. Said optical system is applicable as an objective lens, relay lens and eyepiece.
Claims34
An optical system for endoscopes comprising:
- stop means having an aperture and including means for varying an area of the aperture thereof, and
- a lens system having a lens component arranged in the vicinity of or conjugate with said stop means, said lens having a plurality of lens surface portions corresponding to the areas of the varied apertures of said stop means, each said portion having a different focal length from each other said portion.
Dependencies are inferred from the claim text.