Objective optical system, optical unit, and endoscope apparatus with lenses of partially spherical shape
AssigneeOlympus Corporation
InventorsTakehiro Miki, Mitsuru Namiki
Life of this patent
Estimating the term…
Abstract
An objective optical system including a first lens and a second lens that are arranged in this order from an object side along a main optical axis, wherein the first lens has a partially spherical shape having a first flat surface, the second lens has a partially spherical shape having a second flat surface, the first flat surface is disposed on a side of the object and is inclined with respect to the main optical axis, and the second flat surface is disposed on an opposite side which is opposite from the side of the object and is perpendicular to the main optical axis.
Claims20
An objective optical system comprising a first lens and a second lens that are arranged in this order from an object side along a main optical axis, wherein:
- the first lens has a partially spherical shape having a first flat surface and a first spherical surface;
- the second lens has a partially spherical shape having a second flat surface and a second spherical surface;
- the first flat surface is disposed on a side of the object and is inclined with respect to the main optical axis;
- the second flat surface is disposed on an opposite side which is opposite from the side of the object and is perpendicular to the main optical axis;
- light beams entering the first lens is refracted at the first flat surface and enters the second lens;
- and
- light beams entering the first spherical surface is totally reflected at the first flat surface and enters the second lens.
An optical unit comprising an objective optical system, wherein the objective optical system comprises a first lens and a second lens that are arranged in this order from an object side along a main optical axis, wherein:
- the first lens has a partially spherical shape having a first flat surface and a first spherical surface;
- the second lens has a partially spherical shape having a second flat surface and a second spherical surface;
- the first flat surface is disposed on a side of the object and is inclined with respect to the main optical axis;
- the second flat surface is disposed on an opposite side which is opposite from the side of the object and is perpendicular to the main optical axis;
- light beams entering the first lens is refracted at the first flat surface and enters the second lens;
- and
- light beams entering the first spherical surface is totally reflected at the first flat surface and enters the second lens,
- wherein the optical unit further comprises a cylindrical holding member.
An endoscope apparatus comprising an objective optical system, wherein the objective optical system comprises a first lens and a second lens that are arranged in this order from an object side along a main optical axis, wherein:
- the first lens has a partially spherical shape having a first flat surface and a first spherical surface;
- the second lens has a partially spherical shape having a second flat surface and a second spherical surface;
- the first flat surface is disposed on a side of the object and is inclined with respect to the main optical axis;
- the second flat surface is disposed on an opposite side which is opposite from the side of the object and is perpendicular to the main optical axis;
- light beams entering the first lens is refracted at the first flat surface and enters the second lens;
- and
- light beams entering the first spherical surface is totally reflected at the first flat surface and enters the second lens.
Dependencies are inferred from the claim text.