Abstract: To improve the imaging while simultaneously simplifying the manufacturing of a rigid endoscope (2), an inversion system (1) is used as a relay optical unit for the image transfer from an objective (3) to a proximally arranged camera unit (4) of the endoscope (2). The inversion system has an odd number of a first type A of rod lenses (7) and an even number of a second type B of rod lenses (7), which are each arranged on half of the inversion system (1) with respect to a center plane (9) of the inversion system (1).

Abstract: A method for multispectral recording of an image stream, in which a sequence of single images of a scene, in particular a continuous video image data stream, is recorded as an image stream using an image sensor of an image recording system. At least two different types of single images are recorded in different associated wavelength ranges using the image sensor. At least one type A single image of the sequence is recorded during a chronological type A recording segment and at least one type B single image of the sequence is recorded during a chronological type B recording segment. The type A recording segment and the type B recording segment are chronologically separated from one another by a respective waiting interval, in which no image data are sensorially acquired using the image sensor. An image recording system is also provided that to carry out the method.

Abstract: For high-performance “advanced imaging” applications, a synchronization signal (13), which is output by a playback device (14) or another data sink, such as a server application, is used to synchronize the chronological recording of an image stream (1) chronologically exactly with the playback of this image stream on the playback device and/or to synchronize the recording with an alternating illumination. Here, the synchronization signal (13) is used to trigger an image recording frequency of an image sensor (7) of an image recording system (23), by which the image stream is recorded. Furthermore, the synchronization signal can also be used to chronologically trigger a light source (21) of the image recording system, so that during the recording of the sequence of single images (2), an alternating illumination is obtainable, which is also synchronized with the recording of the single images and/or the image playback on the playback device.

Abstract: For improved imaging in a visualization system (1) having two image sensors (2a, 2b), which are spaced apart from one another axially with respect to a longitudinal axis (27) of the visualization system (1) and sensorially acquire a respective imaging beam path (4a, 4b), which is generated by an assigned imaging optical unit (31) upstream of a deflection prism (3), it is provided that a structural height of the prism (3) be made suboptimal, in order to thus be able to alleviate imaging errors upon use of a wavelength-selective first mirror surface (8) of the prism (3). Moreover, it is alternatively or additionally provided that two optical channels (16a) and (16b) be formed by the imaging optical unit (31), through which the image sensors (2a) and (2b), preferably in different wavelength ranges, can each acquire images of an object (37) observed using the visualization system (1) from different perspectives.

Abstract: An optic light guide includes a plurality of light-guiding single fibres which are combined into a bundle and at least one sheath which encloses at least one section of an outer circumference of the bundle, the at least one sheath being made of ceramic. The optic light guide may be arranged in an area of a tip of an endoscope.

Abstract: To improve the imaging while simultaneously simplifying the manufacturing of a rigid endoscope (2), an inversion system (1) is used as a relay optical unit for the image transfer from an objective (3) to a proximally arranged camera unit (4) of the endoscope (2). The inversion system has an odd number of a first type A of rod lenses (7) and an even number of a second type B of rod lenses (7), which are each arranged on half of the inversion system (1) with respect to a center plane (9) of the inversion system (1).