Abstract: An objective lens for an endoscope has an object-side lens element including a plane-convex rod lens and an image-side lens element including a biconvex lens arranged at the image-side end of the objective lens. The object-side lens element includes a plane-convex first lens and a biconcave second lens which form a front lens and are arranged in this order on the object side of the plane-convex rod lens forming a third lens. As viewed from the object side, the image-side lens element includes a biconvex fourth lens, a concave-plane fifth lens and a biconcave sixth lens which are arranged in this order on the object side of the biconvex lens that is arranged at the image-side end of the objective lens and forms a seventh lens.

Abstract: A camera objective lens for an endoscope has an object-side first prism and an image-side second prism, a first lens system arranged on the object side of the first prism and a second lens system arranged on the image side of the first prism, and a sensor surface arranged at the image-side end of the camera objective lens parallel to the longitudinal axis of an endoscope shaft of the endoscope. The first prism and the second prism are designed to cause a first to third beam deflection as a three-fold beam deflection. The first lens system includes a biconcave first lens, a biconvex second lens, a third lens formed as a rod lens, a plane-concave fourth lens and a biconvex fifth lens in this order as viewed from the object side. The second lens system includes a convex-plane sixth lens, a seventh lens formed as a meniscus lens, a biconvex eighth lens and a biconcave ninth lens in this order as viewed from the object side.

Abstract: A relay optical system for a rigid endoscope has two identically formed lens systems which are arranged symmetrically to each other with respect to a plane of symmetry that is perpendicular to the optical axis. The lens systems each comprise a first biconvex lens, a biconcave lens, a rod lens having a convex lens surface facing the plane of symmetry and a concave lens surface facing away from the plane of symmetry, and a second biconvex lens, in this order as viewed from the plane of symmetry.

Abstract: A relay optical system for a rigid endoscope has two identically formed lens systems which are arranged symmetrically to each other with respect to a plane of symmetry that is perpendicular to the optical axis. The lens systems each comprise a first biconvex lens, a biconcave lens, a rod lens having a convex lens surface facing the plane of symmetry and a concave lens surface facing away from the plane of symmetry, and a second biconvex lens, in this order as viewed from the plane of symmetry.

Abstract: A camera objective lens for an endoscope has an object-side first prism and an image-side second prism, a first lens system arranged on the object side of the first prism and a second lens system arranged on the image side of the first prism, and a sensor surface arranged at the image-side end of the camera objective lens parallel to the longitudinal axis of an endoscope shaft of the endoscope. The first prism and the second prism are designed to cause a first to third beam deflection as a three-fold beam deflection. The first lens system includes a biconcave first lens, a biconvex second lens, a third lens formed as a rod lens, a plane-concave fourth lens and a biconvex fifth lens in this order as viewed from the object side. The second lens system includes a convex-plane sixth lens, a seventh lens formed as a meniscus lens, a biconvex eighth lens and a biconcave ninth lens in this order as viewed from the object side.

Abstract: An objective lens for an endoscope has an object-side lens element including a plane-convex rod lens and an image-side lens element including a biconvex lens arranged at the image-side end of the objective lens. The object-side lens element includes a plane-convex first lens and a biconcave second lens which form a front lens and are arranged in this order on the object side of the plane-convex rod lens forming a third lens. As viewed from the object side, the image-side lens element includes a biconvex fourth lens, a concave-plane fifth lens and a biconcave sixth lens which are arranged in this order on the object side of the biconvex lens that is arranged at the image-side end of the objective lens and forms a seventh lens.