Objective lens for endoscope and endoscope
AssigneeFUJIFILM Corporation
InventorHitoshi MIYANO
Life of this patent
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Abstract
In an objective lens for an endoscope, the full angle of view exceeds 120 degrees, and a most-object-side surface of the objective lens is spherical. Further, the following condition formulas (1) and (2) are satisfied: 0.7<θ8/θ10<0.8 (1); and 5<R1/f<15 (2), where θ10: half angle of view corresponding to a maximum image height; θ8: half angle of view corresponding to an image height that is 80% of the maximum image height; R1: curvature radius of the most-object-side surface; and f: focal length of the entire system of the objective lens.
Claims6
An objective lens for an endoscope, wherein the full angle of view of the objective lens exceeds 120 degrees, and wherein a most-object-side surface is spherical, and wherein the following condition formulas (1) and (2) are satisfied:
- 0.7<θ8/θ10<0.8 (1);
- and
- 5<R1/f<15 (2),
- where θ10:
- half angle of view corresponding to a maximum image height;
- θ8:
- half angle of view corresponding to an image height that is 80% of the maximum image height;
- R1:
- curvature radius of the most-object-side surface;
- and
- f:
- focal length of the entire system of the objective lens.
Dependencies are inferred from the claim text.