Optical system and a surgical instrument with such an optical system

An optical system comprising:

• a distal optical assembly;
• a proximal optical assembly;
• and
• an image sensor;
• wherein the distal and proximal optical assemblies define a beam path;
• the distal optical assembly couples incident beams of light from a field of view located in an object space in the proximal optical assembly;
• the proximal optical assembly directs the incident beams of light onto a light-sensitive surface of the image sensor;
• and
• the distal optical assembly comprises a first prism, a second prism and a third prism with a first air gap between the first prism and the second prism, and a second air gap between the second prism and the third prism, wherein a refractive index of each of the first air gap and the second air gap is less than a refractive index of the first prism, the second prism and the third prism, so that the first prism, the second prism and the third prism and the first and second air gaps cause a total reflection of light rays in a range of angles, and wherein the first prism, the second prism and the third prism are configured having mirror symmetry with respect to a vertical plane perpendicular to an optical axis of the first prism, the second prism and the third prism, wherein, in a direction of incident light, the first prism comprises a first rectangular prism, the second prism comprises an isosceles prism and the third prism comprises a second rectangular prism arranged one after another in the direction of incident light, wherein the isosceles prism comprises a second boundary surface at which total reflection takes place, and the second rectangular prism is arranged abutting the second boundary surface.

An optical system comprising:

• a distal optical assembly;
• a proximal optical assembly;
• and
• an image sensor;
• wherein the distal and proximal optical assemblies define a beam path;
• the distal optical assembly couples incident beams of light from a field of view located in an object space in the proximal optical assembly;
• the proximal optical assembly directs the incident beams of light onto a light-sensitive surface of the image sensor;
• and
• the distal optical assembly comprises a first prism, a second prism and a third prism with a first air gap between the first prism and the second prism, and a second air gap between the second prism and the third prism, wherein a refractive index of each of the first air gap and the second air gap is less than a refractive index of the first prism, the second prism and the third prism, so that the first prism, the second prism and the third prism and the first and second air gaps cause a total reflection of light rays in a range of angles, and wherein the first prism, the second prism and the third prism are configured having mirror symmetry with respect to a vertical plane perpendicular to an optical axis of the first prism, the second prism and the third prism, wherein, in a direction of incident light, the first prism comprises a first rectangular prism, the second prism comprises an isosceles prism and the third prism comprises a second rectangular prism arranged one after another in the direction of incident light, wherein the isosceles prism comprises a second boundary surface at which total reflection takes place, and the second rectangular prism is arranged abutting the second boundary surface, and wherein the first and second boundary surfaces are inclined in different directions, such that the beams of light reflected out of the beam path leave the beam path in different directions.