Patent ID: 9121996
Filing Date: 2015-09-01
Classification: A61B,G02B

Abstract:
1. An objective lens of an angularly viewing, rigid endoscope, the objective lens comprising: a prism arrangement comprising distal and proximal prisms, both contacting with planar contact surfaces that are inclined relative to an axis, the distal prism includes a distal end face positioned perpendicular to a viewing direction, from which a ray incident on the distal end face along the viewing direction is transmitted through the distal prism and through a penetration area of the planar contact surfaces and into the proximal prism, in which the ray is reflected at a first angle by a first mirror disposed on an inclined surface facing the planar contact surfaces, the ray is then reflected by a second mirror disposed on one of the contact surfaces and is emitted through a surface that is perpendicular to the axis and along a direction of the axis, wherein the contact surfaces are inclined to the distal end face; the second mirror is spaced apart from the penetration area in an inclining direction of the contact surfaces, an absorption layer is provided in the contact surfaces; the absorption layer is positioned between a region at which the second mirror is disposed and the penetration area; and an oblique ray, that is incident on the distal end face at a predetermined angle relative to the viewing direction, is transmitted through the penetration area, and is reflected by the first mirror at a second angle that is different from the first angle, and is absorbed by the absorption layer.