Patent ID: 11925327
Assignee: QUEST PHOTONIC DEVICES B.V.
Field: Optics (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. An endoscope comprising, in a distal part, a dichroic prism assembly (P1-P7) configured to receive light from an object image through an entrance face of the dichroic prism assembly, the dichroic prism assembly comprising a first prism (P3) and a further dichroic prism assembly (P5, P6, P7) for splitting light in three light components, the first prism having a cross section with at least five corners, each corner having an inside angle of at least 90 degrees,
wherein the corners of the first prism are designed so that an incoming beam which enters the entrance face in a direction parallel to a normal of said entrance face is partially reflected twice inside the first prism and exits the first prism through an exit face parallel to a normal of said exit face towards a first sensor (D2),
wherein the normal of the entrance face and the normal of the exit face are perpendicular to each other, and, wherein the dichroic prism assembly comprises a compensator prism (P4) between the first prism and the further dichroic prism assembly,
wherein a first path length travelled by the part of the incoming beam reflected twice inside the first prism towards the first sensor (D2) is the same as a second path length travelled by a part of the incoming beam not reflected inside the first prism and entering the further dichroic prism assembly (P5, P6, P7) towards one of three sensors (D3, D4, D5), taking into account an adjustment for focal plane focus position difference in wavelengths to be detected at the first sensor and the three sensors, wherein the first path length is measured from the entrance face to the first sensor and wherein the second path length is measured from the entrance face to the one of three sensors.