Abstract: Examples relate to a Light-Emitting Diode-based illumination system for a microscope, to a system, method and computer program for a microscope, and to a microscope system. The illumination system comprises one or more first LED-based light sources. The one or more first LED-based light sources are configured to emit light across a white light color spectrum. The illumination system comprises at least one optical filter. The at least one optical filter is arranged to filter the light emitted by the one or more first LED-based light sources. The illumination system comprises one or more second LED-based light sources. The one or more second LED-based light sources are configured to provide light having at least one peak at a wavelength that is tuned to an excitation wavelength of at least one fluorescent material.

Abstract: Examples relate to a microscope system comprising a Light-Emitting Diode (LED)-based illumination system and at least one image sensor assembly, and to a corresponding system, method and computer program. The LED-based illumination system is configured to emit radiation power having at least one peak at a wavelength that is tuned to an excitation wavelength of at least one fluorescent material and/or to emit radiation power across a white light spectrum, with the light emitted across the white light spectrum being filtered such that light having a wavelength spectrum that coincides with at least one fluorescence emission wavelength spectrum of the at least one fluorescent material is attenuated or blocked. The at least one image sensor assembly is configured to generate image data, with the image data (at least) representing light reflected by a sample that is illuminated by the LED-based illumination system.

Abstract: Examples relate to a Light-Emitting Diode-based illumination system for a microscope, to a system, method and computer program for a microscope, and to a microscope system. The illumination system comprises one or more first LED-based light sources. The one or more first LED-based light sources are configured to emit light across a white light color spectrum. The illumination system comprises at least one optical filter. The at least one optical filter is arranged to filter the light emitted by the one or more first LED-based light sources. The illumination system comprises one or more second LED-based light sources. The one or more second LED-based light sources are configured to provide light having at least one peak at a wavelength that is tuned to an excitation wavelength of at least one fluorescent material.

Abstract: Examples relate to a microscope system comprising a Light-Emitting Diode (LED)-based illumination system and at least one image sensor assembly, and to a corresponding system, method and computer program. The LED-based illumination system is configured to emit radiation power having at least one peak at a wavelength that is tuned to an excitation wavelength of at least one fluorescent material and/or to emit radiation power across a white light spectrum, with the light emitted across the white light spectrum being filtered such that light having a wavelength spectrum that coincides with at least one fluorescence emission wavelength spectrum of the at least one fluorescent material is attenuated or blocked. The at least one image sensor assembly is configured to generate image data, with the image data (at least) representing light reflected by a sample that is illuminated by the LED-based illumination system.

Abstract: An illumination and observation system (1) for an ophthalmic surgical microscope (2) has first, second, third and fourth observation pupils (4, 5, 8, 9) for two observers, a coaxial illumination (6, 10, 11) in the first, third and fourth observation pupils to generate a red reflex (13) therein, and a main illumination (7) in the second observation pupil. For widely illuminating the surroundings, the main illumination has a larger illumination field than the coaxial illumination in any of the first, third and fourth observation pupils. For superior observation quality and a visible and homogenous red reflex in the second observation pupil, the main illumination overlaps at least 50% with the second observation pupil. The main illumination may be aligned within ±5° to an optical axis (12) of the second observation pupil and to overlap the coaxial illumination at least 50% with the first, third and fourth observation pupils.

Abstract: An illumination and observation system (1), in particular for an ophthalmic microscope, comprises a first observation pupil (4) and a second observation pupil (5) for the eyes of an observer such as an assistant. Further, the system comprises a coaxial illumination (6) in the first observation pupil (4) and a main illumination (7), the coaxial illumination (6) being adapted to generate a red reflex (13) in the observed eye in operation and the main illumination having a larger field of illumination than the coaxial illumination (6, 10, 11). To facilitate usage of the system (1) and/or the microscope (2) and to create a superior stereoscopic view using the red reflex (13), a control subsystem (21, 27) is provided which is adapted to automatically adjust an intensity of the main illumination (7) depending on a change in an intensity of the coaxial illumination (6).

Abstract: The present invention provides a pivotable optical assembly for a surgical microscope, specifically a zero-degree assistant's device, the assembly comprising: a microscope body interface for mounting the assembly on a microscope body; an assistant's module including an interface for an assistant's tube, the assistant's module being pivotable about a pivot axis relative to the microscope body; and a retaining system that blocks pivoting the assistant's module about the pivot axis. The retaining system comprises: a retaining element being moveable from a locking position into a release position, a biasing member forcing the retaining element into the locking position, and a hand-operable control element acting on the retaining element for moving it from the locking position into the release position, as well as a pivotable optical assembly comprising said retaining system according to the invention, whose retaining element, in its blocking position, blocks pivoting the assistant's module about the pivot axis.

Abstract: The invention relates to an Illumination and observation system (1), in particular for an ophthalmic microscope. The system comprises a first observation pupil (4) and a second observation pupil (5) for the eyes of an observer such as an assistant. Further, the system comprises a coaxial illumination (6) in the first observation pupil (4) and a main illumination (7), the coaxial illumination (6) being adapted to generate a red reflex (13) in the observed eye in operation and the main illumination having a larger field of illumination than the coaxial illumination (6, 10, 11). In order to facilitate usage of the system (1) and/or the microscope (2) and to create a superior stereoscopic view using the red reflex (13), a control subsystem (21, 27) is provided which is adapted to automatically adjust an intensity of the main illumination (7) depending on a change in an intensity of the coaxial illumination (6).

Abstract: The invention relates to an Illumination and observation system (1) for a microscope (2), in particular a microscope for performing eye surgery, a microscope and a microscopying method. The Illumination and observation system (1) comprises a first, second, third and fourth observation pupil (4, 5, 8, 9) for the eyes of two observers such as a surgeon and an assistant, a coaxial illumination (6, 10, 11) in the first, third and fourth observation pupil (4, 8, 9) to generate a red reflex (13) in the first, third and fourth observation pupil (4, 8, 9), and a main illumination (7) in the second observation pupil (5). In order to provide a wide illumination of the surroundings, the main illumination has a larger field of illumination than the coaxial illumination (6, 10, 11) in any of the first, third and fourth observation pupil (4, 8, 9).

Abstract: The present invention provides a pivotable optical assembly for a surgical microscope, specifically a zero-degree assistant's device, the assembly comprising: a microscope body interface for mounting the assembly on a microscope body; an assistant's module including an interface for an assistant's tube, the assistant's module being pivotable about a pivot axis relative to the microscope body; and a retaining system that blocks pivoting the assistant's module about the pivot axis. The retaining system comprises: a retaining element being moveable from a locking position into a release position, a biasing member forcing the retaining element into the locking position, and a hand-operable control element acting on the retaining element for moving it from the locking position into the release position, as well as a pivotable optical assembly comprising said retaining system according to the invention, whose retaining element, in its blocking position, blocks pivoting the assistant's module about the pivot axis.

Abstract: The present invention relates to a slit lamp unit (1) for a surgical microscope, the slit lamp unit (1) comprising a slit illumination unit (2) having a slit illumination optic for generating a slit illumination beam path (5, 6), and a guide rail (3) for displacement of the slit illumination unit (2) along a direction designated by the guide rail (3), the guide rail being embodied for displacement of the slit illumination unit (2) along a linear direction (12), and the slit illumination unit (2) being mounted on the guide rail (3) rotatably around a rotation axis (13) perpendicular to said linear displacement direction (12).

Abstract: The present disclosure relates to a microscope tube comprising at least three tube parts (31, 32, 33) and at least two rotary joints (2, 3, 4, 5), for providing a rotation capability of the tube parts (31, 32, 33) with respect to one another and around rotation axes (10, 11, 28) extending at least in part not parallel to one another, having a brake (7) for locking one of the rotary joints (3), at least one further of the rotary joints (2, 4, 5) being lockable by a coupling element (27, 37) impingeable upon by the brake (7), the coupling element (27, 37) including an angle linkage.

Abstract: A stereomicroscope (1) has two main observer's beam paths (24a, 24b) and two assistant observer's beam paths (23a, 23b) that pass through a main objective (2), such that pupils (4a, 4b; 3a, 3b) of the four beam paths are respectively formed in the objective plane, where the stereo bases (9, 10), connecting the centers of a pupil pair, of the main observer's and assistant observer's beam paths intersect at an angle, and has a device for illumination incoupling comprising an illumination deflection element (8) arranged such that illumination light is couplable simultaneously into all four observation beam paths (24a, 24b; 23a, 23b), imaginary connecting lines (12, 13) extending perpendicular to and between the axes respectively of an assistant observer's beam path and of a main observer's beam path, and the illumination deflection element arranged such that two parallel connecting lines are located in the plane of the illumination deflection element.

Abstract: A turbine airfoil may be a rotating blade having a single platform, or a stationary nozzle having a pair of platforms. The airfoil body has pressure and suction sidewalls extending between leading and trailing edges. A compound fillet is disposed between the airfoil body and at least one of the platforms. The compound fillet includes a concave first fillet having a first radius, and a concave second fillet having a second, greater radius. The second fillet extends from the leading edge downstream along the suction sidewall and terminates at a point upstream of the trailing edge. The second fillet may also extend downstream from the leading edge along the pressure sidewall.

Abstract: A method for assembling a gas turbine engine is provided. The method includes providing a turbine nozzle including an outer band and an inner band, wherein each band includes a leading edge, a trailing edge, and a body extending therebetween. At least one of the outer band and the inner band has at least one radial tab extending outward therefrom. The method also includes coupling at least one seal between at least one of the radial tabs extending from the outer band and the inner band and a respective leading edge of the outer and inner band. The method also includes positioning at least one non-planar seal support against at least one portion of the seal.

Abstract: A gas turbine engine nozzle segment and process for producing such a nozzle segment to exhibit improved durability and aerodynamic performance. The process produces a nozzle segment having at least one vane between and interconnecting a pair of platforms. The nozzle segment is cast from a gamma prime-strengthened nickel-base superalloy, on whose surface is thermal sprayed an environmental coating formed of a MCrAlX-type coating material. The surface of the environmental coating is then worked to cause the coating to have a surface finish of less than 2.0 micrometers Ra. Cooling holes are then drilled in the nozzle segment, after which an oxidation-resistant coating is applied on the smoothed surface of the nozzle segment so as to maintain an outermost surface on the nozzle segment having surface finish of less than 2.0 micrometers Ra.

Abstract: A turbine nozzle includes a hollow vane joined to opposite inner and outer bands. The inner band includes a forward lip under the leading edge of the vane, an aft lip under the trailing edge of the vane, and a mounting flange spaced therebetween. An impingement bore extends obliquely and aft from the base of the mounting flange under a corner of the inner band toward the aft lip for impingement cooling thereof.