Objective optical system for endoscope and endoscope
AssigneeFUJIFILM Corporation
InventorChikara YAMAMOTO
Life of this patent
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Abstract
An objective optical system for an endoscope forms an intermediate image at a position conjugate to an object surface, forms the intermediate image on an imaging plane again, and includes an aperture stop that is provided between the intermediate image and the imaging plane. Conditional expression (1) is satisfied in a case in which a distance between a lens surface closest to an object and a paraxial entrance pupil position on an optical axis is denoted by FS and a focal length of the entire system is denoted by f. |FS/f|<0.75 (1)
Claims10
An objective optical system for an endoscope that forms an intermediate image at a position conjugate to an object surface and forms the intermediate image on an imaging plane again, comprising:
- a stop that is provided between the intermediate image and the imaging plane,
- wherein Conditional expression (1) is satisfied in a case in which a distance between a lens surface closest to an object and a paraxial entrance pupil position on an optical axis is denoted by FS and a focal length of the entire system is denoted by f,
- |FS/f|<0.75 (1).
Dependencies are inferred from the claim text.