Image acquisition assembly and holding device for a prism and at least two image sensors

Abstract

An image acquisition assembly for an optical instrument comprises a beam-splitting prism (30) with a light-entry surface (31), a dichroic reflective layer (32) or interface, a first light-emission surface (34) and a second light-emission surface (35), at least two image sensors (40, 50), and a mounting device. A first image sensor (40) is located at the first light-emission surface (34) of the prism (30), and a second image sensor (50) is located at the second light-emission surface (35) of the prism (30). The mounting device includes a first socket (60; 60'; 60") for mechanically rigidly connecting the first image sensor (40) to the prism (30) and a second socket (80; 80'; 80") for mechanically rigidly connecting the second image sensor (50) to the prism (30).The first version (60; 60'; 60") has at least one stop for contact with a first stop surface (36) of the prism (30) and for contact with a stop surface (46) on the first image sensor (40). The second version (80; 80'; 80") has at least one stop for contact with a second stop surface of the prism (30) and / or for contact with a stop surface (56) on the second image sensor (50).

Description

Technical field

[0001] The present invention relates to an image acquisition assembly with at least two image sensors on a beam-splitting prism and a holding device for mechanically rigidly holding the at least two image sensors on the prism and an optical instrument with such an image acquisition assembly. State of the art

[0002] In medical technology, but also for applications outside of medicine, increasingly smaller optical instruments are being developed, such as rigid or flexible endoscopes. These instruments often comprise several modules, such as an electronic module for light generation and control, a flexible or rigid shaft module for guiding light beams to the examination site, and an image acquisition assembly for capturing optical images at the examination site. Precise arrangement of the components of the individual modules and assemblies is crucial to enable high-quality imaging and image localization. For example, German patent DE 2019 106 453 A1 describes an endoscope with an optical system at the end of an elongated shaft. The optical system includes a prism held in a prism holder and an image intensifier for capturing images, which is located on a light-exiting surface of the prism.The prism holder is designed as a cylindrical sleeve and has several stops for aligning the prism in the prism holder and for positioning the prism in the optical system.

[0003] In many cases, capturing images in different wavelength ranges, both within and outside the visible spectrum for the healthy human eye, is desirable or necessary. For example, it may be necessary to observe visible light and fluorescent light simultaneously.

[0004] If different image sensors are used for different wavelength ranges, the light must first be split according to wavelength ranges – particularly by means of a dichroic reflective layer or interface – and then fed separately to the different image sensors. The dichroic reflective layer or interface is typically located within a prism with one light-entry surface and several light-emission surfaces. An image sensor is positioned at each light-emission surface to capture images in the respective wavelength range.

[0005] For example, US Patent 2022 / 0179189 A1 describes an endoscope for dual image acquisition. The endoscope's image acquisition module features a beam-splitting prism to split a measurement beam, directing it toward a first image sensor and toward a second image sensor. The image sensors and the prism can be located, for example, directly within the endoscope housing or within the housing of an image acquisition assembly, such as a camera head attached to the endoscope housing. Miniaturizing an image acquisition assembly consisting of a prism and multiple image sensors presents a technological and manufacturing challenge, requiring particular attention to the precise geometric arrangement and alignment of the components within the assembly and to accurate beam guidance.

[0006] US Patent 4,591,901 describes a mounting arrangement for attaching at least one image-receiving element to a light-exit aperture of a four-sided light or color-splitting prism. The first and second mounting plates are attached to opposite sides of the prism, perpendicular to the plane of the light-exit aperture. The mounting plates are connected to the three light-exit faces of the prism by support plates. For this purpose, recesses are provided within the edge region of the mounting plates in the areas adjacent to the light-exit faces of the prism. The support plates have a central section in which the image-receiving elements are mounted, while projections at the edge of the support plates engage in the recesses of the mounting plates to position the image-receiving elements on the prism.Such a holding arrangement with a large number of individual plates is not suitable for miniaturizing an image acquisition assembly for medical technology. Description of the invention

[0007] One object of the present invention is to provide an improved image acquisition assembly comprising a holding device for mechanically rigidly holding at least two image sensors on a beam-splitting prism, an improved holding device, and an improved optical instrument. In particular, the invention aims to enable reliable and precise positioning of the prism and image sensors relative to each other and relative to other components of the image acquisition assembly, simple assembly of the prism and image sensors in the image acquisition assembly, and a reduction in the required installation space.

[0008] This problem is solved by an image acquisition assembly, a holding device for holding a prism and at least two image sensors of such an image acquisition assembly and an optical instrument with such an image acquisition assembly according to the independent claims.

[0009] Advantageous embodiments and further developments of the invention can be found in the dependent claims.

[0010] An image acquisition assembly according to the invention comprises a beam-splitting prism with a light-entry surface, a dichroic reflective layer or interface, at least one first light-emission surface and a second light-emission surface, at least two image sensors, and a holding device for holding the prism and the at least two image sensors. A first image sensor is arranged on the first light-emission surface of the prism, and a second image sensor is arranged on the second light-emission surface of the prism. The holding device has a first socket for mechanically rigidly connecting the first image sensor to the prism and a second socket for mechanically rigidly connecting the second image sensor to the prism. The first socket has at least one stop for abutting a first stop surface of the prism and for abutting a stop surface on the first image sensor.The second version has at least one stop for contact with a second contact surface of the prism and / or for contact with a contact surface on the second image sensor. The stop of the second version is designed, at least partially, to contact a surface area of ​​the prism that includes the light-entry surface of the prism.

[0011] The image acquisition assembly and the holding device according to the invention are specifically designed and intended as components of an endoscope or other optical instrument for microinvasive medical procedures. The image acquisition assembly, including the holding device, prism, and image sensors, therefore has linear dimensions of no more than one centimeter or on the order of a few millimeters.

[0012] The image acquisition assembly includes, in particular, a prism comprising two sub-prisms with a dichroic reflective layer or interface between them. The dichroic reflective layer or interface reflects light in a first spectral range and transmits light in a second spectral range, the first and second spectral ranges being disjoint. For example, the dichroic reflective layer or interface directs light entering through the light-entry surface in the visible spectral range (visible to the healthy human eye) to the first image sensor and infrared light to the second image sensor. This enables the simultaneous observation of visible light and infrared light reflected or emitted by an object.It is also conceivable that the prism has a second dichroic reflective layer or interface and three light-emitting surfaces. In this case, three image sensors and a mounting device with three sockets and stops for the prism and / or image sensors are provided. Similarly, more than three light-emitting surfaces on the prism and, consequently, more than three image sensors could be provided.

[0013] The first and second image sensors can each have wavelength-dependent or wavelength-selective sensitivity. The first and second image sensors can each include a filter or form an assembly with a filter that blocks or suppresses unwanted wavelengths.

[0014] The mounting brackets create a mechanically rigid connection between the prism and the respective image sensor, such that after the prism and image sensors are mounted in the brackets, any relative movement is preferably prevented. After insertion, the bracket, prism, and image sensor are mechanically and rigidly positioned relative to each other by the stop, ensuring that these components are securely held in a predefined orientation. The prism, image sensors, and their respective brackets can be rigidly fixed in their relative positions, for example, by a positive-locking or material-locking connection, by a connecting element such as a clamping element, a locking element, or a spring element, or by other suitable connection methods. Preferably, a permanent connection exists between the brackets and the prism or image sensors after assembly.

[0015] The image acquisition assembly according to the invention allows for precise positioning of the at least two image sensors and the prism relative to each other, and independently of other assemblies or components of an optical instrument. The stop of the first mount allows for precise alignment of the first image sensor with the prism for optimal image acquisition using light from the first spectral range, and the stop of the second mount allows for precise alignment of the second image sensor with the prism for optimal image acquisition using light from the second spectral range. This ensures parallel alignment of the light entry and exit surfaces between the prism and the image sensors. The predefined stops of the holding device facilitate efficient manufacturing of the image acquisition assembly and ensure correct mounting of the image sensors. Furthermore, the assembly of the optical instrument is simplified.

[0016] According to one variant of the image acquisition assembly, the first and second versions are designed as separate components. The first and second versions can be manufactured separately. Alternatively, the first and second versions are manufactured simultaneously and only separated at the end of the joint manufacturing process.

[0017] The use of two separate components allows for independent positioning of both mounts and thus particularly precise positioning of the image sensors on the light exit surfaces of the prism.

[0018] According to another variant of the image acquisition assembly, the first version and the second version are at least either directly and rigidly connected mechanically or designed as a single unit.

[0019] The first and second sockets can be manufactured separately and then directly and rigidly connected to each other in a permanent manner, for example, by a material-bonded and / or form-fit connection. The first and second sockets can each be originally manufactured as a single piece or assembled from several components. The first and second sockets are connected, for example, by a welded or soldered joint, an adhesive bond, a crimped joint, or another connection based on plastic deformation and / or a screw connection. In this case, the separately manufactured sockets are in direct contact with each other and are, at most, spatially separated but mechanically connected by a weld, a solder layer, or an adhesive layer.

[0020] Alternatively, the holding device may have originally been manufactured as a single piece.

[0021] The direct, mechanically rigid connection of the mounts or the one-piece manufacturing of the holding device can enable a particularly robust design of the image acquisition assembly. Furthermore, the direct, mechanically rigid connection of the mounts or the one-piece manufacturing of the holding device can enable particularly efficient and therefore also particularly cost-effective production of the image acquisition assembly.

[0022] In one embodiment of an image acquisition assembly according to the invention, the holding device has a stop surface of the first holder that is orthogonal to the first light-exit surface of the prism and / or orthogonal to a light-intake surface of the first image sensor. Furthermore, a stop surface of the second holder can be arranged orthogonal to the second light-exit surface of the prism and / or orthogonal to a light-intake surface of the second image sensor. An orthogonal design of the stop surfaces of the two holders facilitates a parallel arrangement of the light-exit surfaces of the prism and the light-intake surfaces of the image sensors.

[0023] For the purposes of this invention, two surfaces are considered orthogonal if a light ray strikes the light-emitting and light-incoming surfaces at an angle of approximately 90 degrees such that there is essentially no reflection or diffraction at the surfaces. In particular, two surfaces are considered orthogonal if their surface normals form an angle between 70 degrees and 110 degrees, or an angle between 80 degrees and 100 degrees, or an angle between 85 degrees and 95 degrees, or an angle that is exactly 90 degrees within the manufacturing tolerances.

[0024] In one embodiment of the image acquisition assembly according to the invention, the stop of the first mount has a common stop surface for contacting the first stop surface of the prism and the stop surface of the first image sensor, and / or the stop of the second mount has a common stop surface for contacting the second stop surface of the prism and / or the stop surface of the second image sensor. A common stop surface for the prism and the first or second image sensor simplifies the design and manufacture of the mounting device. Furthermore, the assembly of the prism and image sensors on the mounting device can be simplified.

[0025] According to the invention, the mountings of the holding device can each have a single common stop surface for the prism and a light sensor, such as a step or edge that rests against a corresponding stop surface on the prism or light sensor. A mounting can also comprise several common stop surfaces against which the prism and the image sensor, for example, bear with different areas. Particularly in the case of a one-piece holding device, common stop surfaces on the first and second mountings can facilitate easy insertion of the prism and image sensors. However, the mountings can also each have a stop in the form of a stop structure with several differently arranged or oriented stop surfaces, such as a first stop surface and a second stop surface, as described below.The multiple different contact surfaces are, for example, located on different surfaces of the mount or arranged in steps on one side of the mount. Multiple contact surfaces allow for differentiated adaptation of the holding device to the design of the image acquisition assembly.

[0026] In another embodiment of the image acquisition assembly according to the invention, the stop of the first mount has a first stop surface for contacting the corresponding first stop surface of the prism and a second stop surface for contacting the corresponding stop surface on the first image sensor. Furthermore, the stop of the second mount can have a first stop surface for contacting the corresponding second stop surface of the prism and a second stop surface for contacting the corresponding stop surface on the second image sensor. Thus, the first and second image sensors can be arranged on their respective mounts independently of any contact between the prism and the mounting device, and can form a mechanically rigid connection with the prism. Advantageously, the first and second mounts are designed as two separate components and can be attached to the prism independently of each other.Alternatively, the holding device can be designed as a single piece, as described above.

[0027] In this embodiment of the holding device, as described here, at least either the first stop surface of the first socket can be orthogonal to the intended orientation of the first light-exit surface of the prism, or the second stop surface of the first socket can be orthogonal to the intended orientation of a light-intake surface of the first image sensor. In particular, both the first stop surface and the second stop surface of the first socket can be orthogonal to the light-intake or light-exit surface, respectively.

[0028] Such oriented stop surfaces can enable an exact lateral alignment of the first image sensor relative to the first light exit surface of the prism.

[0029] Furthermore, the first contact surface of the second mount can be orthogonal to the intended orientation of the second light-exit surface of the prism, or the second contact surface of the second mount can be orthogonal to the intended orientation of a light-intake surface of the second image sensor. Again, both the first contact surface and the second contact surface of the second mount can be orthogonal to the light-exit or light-intake surface, respectively.

[0030] Such oriented stop surfaces can enable an exact lateral alignment of the second image sensor relative to the second light exit surface of the prism.

[0031] According to a further embodiment of an image acquisition assembly according to the invention, the stop of the first holder, in particular the first stop surface of the first holder, is provided for bearing against a surface area of ​​the prism facing away from the light entry surface of the prism.

[0032] The surface area of ​​the prism facing away from the light-entry surface of the prism is, in particular, not parallel to the light-entry surface and, in particular, does not border the light-entry surface. The second light-emission surface of the prism is, in particular, arranged between the light-entry surface of the prism and the surface area of ​​the prism against which the stop, or the first stop surface of the first socket, rests.

[0033] In particular, the surface normals of the light-entry surface, the first light-emission surface, the second light-emission surface and the surface area of ​​the prism facing away from the light-entry surface, against which the stop or the first stop surface of the first socket rests, lie in one plane.

[0034] In the holding device, the stop of the second socket, in particular the first stop surface of the second socket, is designed to bear at least partially against a surface area of ​​the prism that includes the light-entry surface of the prism. Advantageously, the stop, or the first stop surface of the second socket, rests only partially on the surface area containing the light-entry surface, leaving another part free, in particular the area where an incident light ray strikes the light-entry surface.

[0035] According to yet another embodiment of an image acquisition assembly according to the invention, the stop of the first socket can have a stop surface for bearing against an edge region of the first light-emission surface of the prism and a further stop surface for bearing against an edge region of a light-intake surface of the first image sensor. Furthermore, the stop of the second socket can have a stop surface for bearing against an edge region of the second light-emission surface of the prism and a further stop surface for bearing against an edge region of a light-intake surface of the second image sensor. The first stop surface of the second socket is specifically designed and configured to bear against an edge region of the light-intake surface or of that flat surface region of the prism which comprises the light-intake surface.By positioning the first stop surface of the first mount against a surface area facing away from the prism's light-entry surface, and the first stop surface of the second mount against a surface area of ​​the prism encompassing the prism's light-entry surface, sufficient space can be provided for both stops even with very small prism and mount dimensions. The prism does not need to be made larger simply to accommodate the stops.

[0036] The contact surfaces for contacting the edges of the prism and image sensors can be configured as the first and second contact surfaces of the mount stops. However, in addition to the first and second contact surfaces described above, the stop of a mount can also include a third and fourth contact surface that contact the edges. For example, the first and second contact surfaces can form a common stop, e.g., oriented orthogonally to the light entry and exit surfaces, or they can be separate contact surfaces. The third and fourth contact surfaces, which contact the edges, run parallel to the light entry and exit surfaces. In this embodiment, the contact of the mounts of the holding device is designed as a stop structure with several different contact surfaces.

[0037] In summary, in a variant of the holding device as described here, the stop of the first socket can have a third stop surface for contact with an edge area of ​​the first light-exit surface of the prism and a fourth stop surface for contact with an edge area of ​​a light-entry surface of the first image sensor, and / or the stop of the second socket can have a third stop surface for contact with an edge area of ​​the second light-exit surface of the prism and a fourth stop surface for contact with an edge area of ​​a light-entry surface of the second image sensor.

[0038] Each mount can therefore have two, in particular, parallel, opposite and each planar surface areas that can be located in the edge areas of the respective light exit surface of the prism and the light entry surface of the respective image sensor in order to enable an exactly parallel alignment of the light entry surface of the image sensor to the light exit surface of the prism.

[0039] Since these contact surfaces only rest on a peripheral area of ​​the light entry and exit surfaces, an inner area surrounded by these peripheral areas remains free of contact surfaces on the mounts. In particular, an inner area of ​​the light entry and exit surfaces can be left unobstructed, allowing at least a large portion of the light radiation to enter and exit. Thus, the contact surfaces at the peripheral areas do not impair image acquisition by the image sensors. Advantageously, in the first mount, the contact surface resting on the peripheral area of ​​the first light exit surface of the prism and the contact surface resting on the peripheral area of ​​the light entry surface of the first image sensor define an initial gap between the prism and the first image sensor.Similarly, in the second version, a second gap between the prism and the second image sensor is defined by the contact surface that rests against the edge of the prism's second light-exit surface and the contact surface that rests against the edge of the second image sensor's light-intake surface. The gaps are defined by the distance between their respective contact surfaces and thus determine the distance between the prism and the image sensor. These gaps advantageously serve as an air gap between the prism and the image sensor, forming an optical layer that can be used for the reflection and transmission of incident light radiation. Depending on the angle of incidence of the light radiation within the prism onto one of the light-exit surfaces or its adjacent optical layer, the light radiation is either reflected or transmitted to the respective image sensor.The geometry of the prism and the dichroic reflective layer or interface provided therein serves to deflect the partial beams to the respective light emission surfaces and thus to the light sensors.

[0040] In a holding device with contact surfaces for abutting the edge regions of the light-in and light-out surfaces, as described above, the first version can advantageously comprise a film component with a first flat surface region and a second flat surface region, wherein the first flat surface region and the second flat surface region of the film component are parallel and facing away from each other. The first flat surface region of the film component can form the contact surface for abutting an edge region of the first light-out surface of the prism, and the second flat surface region of the film component can form the contact surface for abutting an edge region of a light-intake surface of the first image sensor. The thickness of the film component thus determines the size of the gap between the prism and the image sensor.

[0041] The foil component is made primarily from a high-precision measuring film that has two precisely flat and parallel surfaces facing away from each other, thus ensuring a constant thickness. These films can be manufactured in virtually any thickness and are readily available on the market. A correspondingly thin foil component allows for a very small distance between the light-entry surface of the first image sensor and the first light-emission surface of the prism. A film with a thickness in the micrometer range or less can be used advantageously.

[0042] Furthermore, in one embodiment of the holding device, the contact surface for abutting an edge of the first light-exit surface of the prism and the contact surface for abutting an edge of a light-intake surface of the first image sensor of the first mount, as described above, can each be U-shaped or C-shaped. Alternatively or additionally, the contact surface for abutting an edge of the second light-exit surface of the prism and the contact surface for abutting an edge of a light-intake surface of the second image sensor of the second mount, as described above, can each be U-shaped or C-shaped. U-shaped or C-shaped contact surfaces can abut on three of the four sides, or edges of the surfaces, and prevent the image sensor from tilting relative to the prism.

[0043] Alternatively, the contact surfaces of the mounting device can be ring-shaped to rest against the edges of the light entry and exit surfaces. Ring-shaped contact surfaces can rest against all four sides or edges of the surfaces, further preventing the image sensor from tilting relative to the prism. Furthermore, the U-shaped, C-shaped, or ring-shaped contact surfaces of the mounts ensure a precise parallel alignment of the sensor entry surfaces and the prism exit surfaces relative to each other. The shape of the contact surface can also determine the shape of the prism's interior area, which remains free of contact surfaces and thus corresponds to the shape of the gap or air gap. For example, U-shaped or C-shaped contact surfaces can create a larger gap area than ring-shaped contact surfaces, and thus form a larger optical layer.The advantageous feature of the stop structure of the first version is designed such that the light radiation incident on the prism hits the first slit at an angle at which the light radiation is reflected as completely as possible by the dichroic reflecting layer or interface.

[0044] In an advantageous embodiment of an image acquisition assembly according to the invention, a beam-splitting prism is provided with a dichroic reflective layer or interface that is arranged in or parallel to a plane bisecting the angle between the first and second light-exit surfaces of the beam-splitting prism. For example, a beam-splitting prism may be provided whose first and second light-exit surfaces form an angle of 45 degrees, and whose second and second light-exit surfaces form an angle of 90 degrees, and which has a dichroic reflective layer or interface that forms an angle of 22.5 degrees with both the first and second light-exit surfaces.The first version is advantageously U-shaped or C-shaped with an open side oriented towards the light-entry surface of the prism to form a large-area reflection slit. The second version advantageously has an annular topology, which allows a partial beam coming from the interface to pass through to the second light sensor as completely as possible and simultaneously supports precise alignment of the sensor on the prism.

[0045] This embodiment is particularly suitable for very small image acquisition assemblies, such as those used in endoscopes, since the geometry of the prism requires little installation space and the design of the holding device ensures parallelism of the image sensors.

[0046] Especially when the prism's light-entry surface is designed to be orthogonal to the longitudinal axis of a thin shaft, the U-shaped or C-shaped design of the first housing can reduce the required installation space and thus enable a more favorable ratio between the size of the prism and image sensors on the one hand, and the cross-sectional size of the shaft on the other. The second housing, however, can also have a ring-shaped topology even in a severely restricted installation space.

[0047] In yet another embodiment of an image acquisition assembly according to the invention, the first holder can at least partially encompass the prism at at least three different flat or substantially flat surface areas adjacent to the first light-emitting surface. The first holder encompasses the prism, in particular, in that it has surface areas that are at least partially opposite each of the at least three flat surface areas of the prism adjacent to the first light-emitting surface. Furthermore, the second holder can at least partially encompass the prism at at least three flat or substantially flat surface areas adjacent to the second light-emitting surface.The second socket encompasses the prism in particular insofar as the second socket has surface areas that are at least partially opposite one of at least three flat surface areas of the prism that border the second light-exiting surface.

[0048] The partial enclosure of the prism by a mount can simplify or improve both the alignment of the mount relative to the prism and the mechanically rigid and permanent connection of the mount to the prism.

[0049] Each of the aforementioned surface areas of a socket can be in contact with the opposite surface area and / or form a mechanically rigid connection with it, for example by means of an adhesive connection.

[0050] In one embodiment of the image acquisition assembly, for example, the first version has at least three frame sections which, in the intended arrangement, are each opposite one of three different flat or substantially flat surface areas of the prism that adjoin the first light-emitting surface of the prism, and / or the second version has at least three frame sections which, in the intended arrangement, are each opposite one of three different flat or substantially flat surface areas of the prism that adjoin the second light-emitting surface of the prism.

[0051] In particular, each frame section of a mount can have one or more areas opposite an associated flat surface area of ​​the prism that borders one of the light-emitting surfaces of the prism.

[0052] Each frame section of a socket can rest against the opposite surface area and / or form a mechanically rigid connection with it, for example by means of an adhesive bond.

[0053] The aforementioned frame sections of the mounts can simplify or improve both their alignment relative to the prism and their mechanically rigid and permanent connection to the prism.

[0054] In a further embodiment of an image acquisition assembly according to the invention, a beam-splitting prism with a first partial prism and a second partial prism, between which the dichroic reflective layer or interface is arranged, can advantageously be used. For example, either the first socket can be provided and configured to be directly mechanically connected only to the first partial prism, and / or the second socket can be provided and configured to be directly mechanically connected only to the second partial prism. Similarly, in a prism with three partial prisms, a third socket can be provided that is directly mechanically connected only to the third partial prism.With such a design of the prism and the holding device, the image acquisition assembly can be flexibly adapted to different requirements of an optical instrument; for example, prisms with different optical characteristics can be used easily, and suitable holding devices can be provided for this purpose.

[0055] Alternatively, the first version can be designed and configured to be directly mechanically connected to both the first and second partial prisms, and / or the second version can be designed and configured to be directly mechanically connected to both the first and second partial prisms. With such a holding device, the partial prisms can also advantageously be aligned relative to each other.

[0056] In one variant of the image acquisition assembly, the plane in which the dichroic reflective layer or interface is arranged does not intersect either the first or the second mount, or only in an area facing away from the light-entry surface of the beam-splitting prism. In particular, the plane in which the dichroic reflective layer or interface is arranged does not intersect any frame section of the first mount or any frame section of the second mount. This design is particularly useful for separate mounts in order to address the specific characteristics of sub-areas above and below the prism's interface layer separately.

[0057] In one embodiment of an image acquisition assembly according to the invention, the holding device advantageously comprises at least one through-opening for applying adhesive or solder for the material-bonded connection of the first socket with the prism and / or the second socket with the prism.

[0058] The at least one through-hole is arranged, in particular, in a frame section of the first socket and / or the second socket and allows the application of adhesive or solder to a flat surface area of ​​the prism that adjoins the first light-emitting surface and / or the second light-emitting surface of the prism. Each socket can have several through-holes, which can be arranged, in particular, symmetrically.

[0059] According to another aspect of the present invention, an optical instrument is provided which includes an image acquisition assembly as described herein.

[0060] In one embodiment, the optical instrument comprises a shaft with a distal end, wherein the image acquisition unit is arranged at or in the region of the distal end of the shaft. The image acquisition unit is, in particular, located within the shaft. Advantageously, the image acquisition unit can be inserted into and removed from the shaft. The shaft can be rigid and straight, curved, or partially or fully flexible. The shaft serves, in particular, to guide light and electrical lines to and from the image acquisition unit, as is common in image acquisition instruments.

[0061] The optical instrument is specifically designed as an endoscopic device. An "endoscopic device" is understood to mean, in particular, a functional component, especially a subassembly and / or a structural and / or functional component of an endoscopic instrument and / or an endoscope. Alternatively, the endoscopic device can constitute an endoscope and / or an endoscopic instrument, at least partially, preferably at least to a large extent, and particularly preferably completely. The term "endoscopic" is also understood to include minimally invasive procedures. The endoscopic device is, for example, designed to be inserted, at least partially and preferably at least to a large extent, into an artificial and / or natural opening, in particular a body orifice, in order to perform treatment and / or examination therein.An endoscopic instrument could, for example, be an endoscopic forceps instrument, an endoscopic scissors instrument, an endoscopic scalpel instrument, an endoscopic clamp instrument, or the like.

[0062] It is emphasized that the image acquisition assembly and the holding device according to the invention are also suitable for optical instruments, in particular endoscopes, with more than two image sensors and for prisms with more than two light-emitting surfaces. In this case, the holding device can have additional sockets; e.g., a separate socket for each image sensor for connection to a light-emitting surface of the prism. Alternatively, more than one image sensor can be rigidly connected to the same light-emitting surface of the prism in the same socket. Brief description of the drawings

[0063] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous technical features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations, or associate them with further exemplary embodiments of the invention, as described above.

[0064] They show: Fig. 1 a schematic axonometric representation of an optical instrument with a variant of an image acquisition assembly according to the invention; Fig. 2 a schematic axonometric representation of the image acquisition assembly made of Fig. 1 with an embodiment of a holding device according to the invention; Fig. 3 a schematic representation of a section through the image acquisition assembly made of Fig. 2; Fig. 4 a schematic axonometric representation of a first version of the embodiment of the holding device made of Fig. 2 in a first view; Fig. 5 another schematic axonometric representation of the first version from Fig. 2 in a second view and an exploded view of the first image sensor; Fig. 6 a schematic axonometric representation in a first view of a second version of the embodiment of the holding device Fig. 2; and Fig. 7 another schematic axonometric representation of the second version from Fig. 2 in a second view and an exploded view of a second image sensor: Description of exemplary implementations

[0065] Fig. Figure 1 contains a schematic axonometric representation of a part of an optical instrument 10, namely an endoscope with a shaft 11. The endoscope 10 can be designed and configured for medical or technical applications. The shaft 11 can be rigid and straight, curved, or partially or completely flexible. The shaft 11 can be connected in a known manner to other assemblies of the endoscope 10, for example, to a light-generating assembly, an optical assembly, a control assembly, an operating unit, etc. An exemplary embodiment of an image acquisition assembly 20 with a holding device 60, 80 according to the present invention is housed in the shaft 11 of the endoscope 10, as shown below with reference to the Fig. Sections 2 to 7 are explained in detail. It is emphasized that differently designed embodiments of an image acquisition assembly according to the invention, as described above, can also be advantageously used in the endoscope.

[0066] In Fig. Figure 1 shows a distal end 12 of the shaft 11. The shaft 11 is shown transparently, so that the image acquisition assembly 20 inside the shaft 11 is visible. Two narrow and long and at least partially flexible conductor sheets 24, 25 extend inside the shaft 11 to the image acquisition assembly 20. Fig. The proximal ends of the printed circuit boards 24, 25 (not shown) are connected to other assemblies via connectors, particularly at a proximal end (not shown) of the optical instrument 10. The printed circuit boards 24, 25 can be connected in Fig. 1. Electronic components are provided for controlling or conditioning electrical power and for processing control signals and image signals. The circuit boards 24, 25 serve to supply electrical power and control signals to the image acquisition assembly and to condition and transmit image signals to the proximal end of the optical instrument 10.

[0067] The image acquisition assembly 20 comprises a prism 30 with a first planar surface area that includes a light entry surface 31. Distal to the light entry surface 31 is a Fig. 1 lens (not shown) arranged to produce an image of an object located outside the endoscope 10. The prism 30 further comprises a dichroic reflective layer or interface 32, the edge of which is Fig. 1 where the flat surface area of ​​the prism 30 encompassing the light-entry surface 31 is visible as a line. The prism 30 also has two in Fig. 1 light emission surfaces facing away from the viewer and therefore not visible, which are formed by a second and a third flat surface area of ​​the prism 30, and on which two image sensors 40, 50 are arranged.

[0068] The first image sensor 40 is mechanically and electrically connected to the distal end of the first circuit board 24 in order to receive electrical power and control signals via the first circuit board 24 and to transmit image signals to a proximal end of the optical instrument 10. The second image sensor 50 is mechanically and electrically connected to the distal end of the second circuit board 25 in order to receive electrical power and control signals via the second circuit board 25 and to transmit image signals to a proximal end of the optical instrument 10.

[0069] Prism 30 also exhibits a [missing information] when represented in Fig. 1. A fourth flat surface area, also facing away from the viewer, is present. This fourth flat surface area faces away from the first flat surface area, which has the light-entry surface 31, and has no optical function. As can be seen from the Fig. As described in section 3, the fourth flat surface area forms a mechanical stop surface.

[0070] The prism 30 further has a fifth planar surface region 37 and a sixth planar surface region, which are parallel and facing away from each other. In the representation in Fig. 1 is the fifth flat surface area 37 facing the viewer, but largely obscured. The fifth flat surface area 37 and the sixth flat surface area are orthogonal to the light-intake surface 31 and to both light-emission surfaces.

[0071] The image acquisition assembly further comprises a first socket 60, which rigidly and preferably permanently connects the first image sensor 40 to the prism 30. The first socket 60 partially surrounds the prism 30 and is connected to the prism 30, for example, by a Fig. 1 adhesive not shown.

[0072] The image acquisition assembly further comprises a second socket 80, which rigidly and preferably permanently connects the second image sensor 50 to the prism 30. The second socket 80 partially surrounds the prism 30 and is connected to the prism 30, for example, by a Fig. 1 adhesive not shown.

[0073] In the Fig. In the exemplary embodiment of the image acquisition assembly 20 shown in Figures 1 to 7, the first version 60 and the second version 80 are separate components that are not connected to each other.

[0074] Fig. Figure 2 contains a schematic and enlarged axonometric representation of the image acquisition group 20 from Fig. 1. The viewing direction from which the image acquisition unit 20 is shown corresponds to that of the Fig. 1. Contours of the shaft 11 are not shown.

[0075] The first version 60 has a Fig. 2 non-visible first frame section 61 and several symmetrically arranged second frame sections 63, which together partially enclose the prism 30 on three sides. The in Fig. 2. The first frame section 61 of the first version 60, which is not visible, lies on the side facing away from the light entry surface 31 of the prism 30 and is shown in the illustration. Fig. 2 non-visible fourth surface area 36 of the prism 30 (cf. Fig. 3) Alternatively, the one in Fig. The two non-visible first frame sections 61 are arranged at a small distance from the fourth surface area 36 of the prism 30. The symmetrically arranged second frame sections 63 of the first version 60 lie on the fifth flat surface area 37 of the prism 30 and on the parallel and opposite surface area shown in the illustration. Fig. 2 non-visible sixth planar surface areas of the prism 30. Each of the second frame sections 63 of the first version 60 can alternatively be located at a small distance opposite the fifth surface area 37 or the sixth surface area of ​​the prism 30.

[0076] The first version 60 also shows a difference in the representation in Fig. 2 non-visible third frame section 65 and several symmetrically arranged fourth frame sections 67, which partially surround the first image sensor 40 on three sides. The in Fig. The two non-visible third frame sections 65 of the first version 60 and the pairwise symmetrically arranged fourth frame sections 67 of the first version 60 lie against strip-shaped lateral edge surfaces 48 of the first image sensor 40. These strip-shaped lateral edge surfaces are, in particular, orthogonal to the light entry surface 43 of the first image sensor 40. Both the in Fig. The two non-visible third frame sections 65 as well as the symmetrically arranged fourth frame sections 67 of the first version 60 can each alternatively be located at a small distance from the associated strip-shaped lateral edge surface 46, 48 of the first image sensor 40.

[0077] The first image sensor 40 and the first housing 60 are permanently and mechanically rigidly connected by a material bond, in particular by means of a Fig. 2 adhesive not shown. The first version 60 and the prism 30 are permanently and mechanically rigidly connected by a material bond, in particular by means of an adhesive in Fig. 2. Adhesive or solder not shown. In the second frame sections 63 of the first version 60, through-openings 69 are provided through which liquid adhesive or liquid solder can be applied.

[0078] The second version 80 has a first frame section 81 and several symmetrically arranged second frame sections 83 that partially surround the prism 30 on three sides. The first frame section 81 of the second version 80 abuts an edge region of the first flat surface region of the prism 30, which includes the light-entry surface 31. Alternatively, the first frame section 81 is arranged at a small distance opposite the edge region of the first flat surface region of the prism 30. The symmetrically arranged second frame sections 83 of the second version 80 abut the fifth flat surface region 37 of the prism 30 and the parallel and opposite side shown in the illustration. Fig. 2 non-visible sixth planar surface areas of the prism 30. Each of the second frame sections 83 of the second version 80 can alternatively be located at a small distance opposite the fifth surface area 37 or the sixth surface area of ​​the prism 30.

[0079] The second version 80 also shows a difference in the representation in Fig. 2 non-visible third frame section 85 and several symmetrically arranged fourth frame sections 87, which together partially surround the second image sensor 50 on three sides. The in Fig. The two non-visible third frame sections 85 and the symmetrically arranged fourth frame sections 87 of the second version 80 lie against strip-shaped lateral edge surfaces 58 of the second image sensor 50. Both the in Fig. The two non-visible third frame sections as well as the symmetrically arranged fourth frame sections 87 of the second version 80 can each alternatively be located at a small distance from the associated strip-shaped lateral edge surface of the second image sensor 50.

[0080] The second image sensor 50 and the second mount 80 are permanently and mechanically rigidly connected by a material bond, in particular by means of solder. The second mount 80 and the prism 30 are permanently and mechanically rigidly connected by a material bond, in particular by means of an adhesive or solder. Through-openings 89 are provided in the second frame sections 83 of the second mount 80, through which liquid adhesive or liquid solder can be applied.

[0081] Fig. Figure 3 contains a schematic representation of a section through the based on the Fig. 1 and Fig. 2. Image acquisition assembly 20 shown. The section plane of the Fig. 3 is parallel to the planar surface areas 37 of the prism 30 (cf. Fig. 1, Fig. 2), orthogonal to the light-entry surface 31, orthogonal to the dichroic reflecting layer or interface 32 and orthogonal to the light-exit surfaces 34, 35 of the prism. The section plane of the Fig. Figure 3 includes, in particular, the optical axis of a lens not shown in the figures. Fig. 3. Some features are visible in the cross-section, which are shown in the representations of the Fig. 1 and Fig. 2 are not visible.

[0082] In the Fig. In the example of the image acquisition assembly shown in Figure 3, a beam-splitting prism 30 is provided, the light-intake surface 31 and the first light-outtake surface 34 of which form an angle of 45 degrees, and the light-intake surface 31 and the second light-outtake surface 35 of which form an angle of 90 degrees. The dichroic reflective layer or interface 32 forms an angle of 22.5 degrees with both the first light-outtake surface 34 and the second light-outtake surface 35. Of course, other geometries can also be provided for the prism. The technical design of the holding device can readily be transferred to such prisms in accordance with the invention.

[0083] The first frame section 61 of the first version 60 has a stop surface 62 that abuts the fourth flat surface area 36 of the prism 30, which adjoins the first light-emitting surface 34 and the second light-emitting surface 35 of the prism 30. The stop surface 62 on the first frame section 61 of the first frame 60 and the fourth flat surface area 36 of the prism 30 are each orthogonal to the cutting plane of the Fig. 3.

[0084] The third frame section 65 of the first version 60 has a stop surface 66 that abuts a first strip-shaped lateral edge surface 46 of the first image sensor 40. The stop surface 66 on the third frame section 65 of the first version 60 and the first strip-shaped lateral edge surface 46 of the first image sensor 40 are each orthogonal to the cutting plane of the Fig. 3. The stop surface 62 and the stop surface 66 together form a stop structure of the first socket 60, with the stop surface 62 as a first stop surface and the stop surface 66 as a second stop surface of the socket 60. The fourth flat surface area 36 of the prism 30 forms a first stop surface of the prism.

[0085] The first version 60 is essentially U-shaped. The cutting plane of the Fig. 3 cuts the first version 60 only in the area of ​​the first frame section 61 and the third frame section 65.

[0086] The first version 60 comprises a foil component 70. The foil component 70 is formed from a flat foil of constant thickness and consequently has two parallel, oppositely facing surface areas 73, 74. The foil component 70 is U-shaped. The section plane of the Fig. 3 cuts the foil component 70 only in an area near the first frame section 61 and the third frame section 65 of the first socket 60. The first flat surface area 73 of the foil component 70 abuts an edge area of ​​the first light-exit surface 34 of the prism 30. The second flat surface area 74 of the foil component abuts an edge area of ​​the light-intake surface 43 of the image sensor 40. The first flat surface area 73 forms a third stop surface and the second flat surface area 74 forms a fourth stop surface of the stop structure of the socket 60.

[0087] The foil component 70 defines a first slit with a predetermined distance and exact parallelism between the first light-exit surface 34 of the prism 30 and the light-intake surface 43 of the first image sensor 40. As shown from Fig. As can be seen in Figure 3, the first slit extends over the majority of the interior of the prism 30. In particular, the slit extends over the projection of the light-entry surface 31 onto the first light-emission surface 34, so that any light rays incident on the prism can be reflected at an optical layer formed by the slit to the interface 32. The slit serves for total internal reflection of the incident light.

[0088] The first frame section 81 of the second frame 80 has a stop surface 82 that abuts an edge region of the first flat surface area, which comprises the light-entry surface 31 of the prism 30. The stop surface 82 on the first frame section 81 of the second frame 80 and the first flat surface area of ​​the prism 30 are each orthogonal to the cutting plane of the Fig. 3.

[0089] The third frame section 85 of the second version 80 has a stop surface 86 that abuts a first strip-shaped lateral edge surface 56 of the second image sensor 50. The stop surface 86 on the third frame section 85 of the second version 80 and the first strip-shaped lateral edge surface 56 of the second image sensor 50 are each orthogonal to the section plane of the Fig. 3. The stop surface 82 and the stop surface 86 together form a stop structure of the second socket 80, with the stop surface 82 as a first stop surface and the stop surface 86 as a second stop surface of the socket 80. The light entry surface 31 of the prism 30 can provide a second stop surface of the prism.

[0090] The second mount 80 has a first flat surface area 93, which abuts an edge region of the second light-exit surface 35 of the prism 30, and a second flat surface area 95, which abuts an edge region of the light-intake surface 53 of the second sensor 50. The second flat surface area 95 is parallel to and facing away from the first flat surface area 93. The second mount 80 and the second flat surface area 95 of the second mount have a circular topology and enclose a circular, oval, or rectangular window 98, which allows light to pass from the prism 30 to the second image sensor 50. In the example shown, the first flat surface area 93 is C-shaped, meaning it largely, but not completely, encloses the window 98.

[0091] The parallel, flat surface areas 93, 95 of the second holder 80 each form a stop surface for the prism 31 and the second image sensor 50. In particular, in this embodiment of the holding device, the first flat surface area 93 can form a third stop surface and the second flat surface area 95 a fourth stop surface of the stop structure of the holder 80. The surface areas 93, 95 define a predetermined distance that forms a second gap located between the prism and the second image sensor. Furthermore, they establish exact parallelism between the second light-exit surface 35 of the prism 30 and the light-intake surface 53 of the second image sensor 50.

[0092] A light beam, guided through the shaft 11 to the image acquisition assembly 20 and entering the prism 30 through the light entry surface 31, strikes the light exit surface 34 at an angle of approximately 45 degrees. There, it undergoes total internal reflection at the optical layer formed by the first slit, so that the light incident on the prism 30 reaches the dichroic reflective layer or interface 32 at least almost completely. There, the light beam is split into a first partial beam, for example, containing light in the visible range, and a second partial beam, for example, containing light in the infrared range. The first partial beam is directed from the interface to the first light exit surface 34 of the prism 30, or to the light entry surface 43 of the first image sensor 40, where it strikes at an angle of approximately 90 degrees and can thus penetrate the optical layer of the first slit and enter the image sensor 40.The second partial beam is directed from the interface to the second light exit surface 35 of the prism 30, or to the light entry surface 53 of the second image sensor 50, where it strikes at an angle of approximately 90 degrees and can penetrate the optical layer of the second slit into the image sensor 50. To ensure this beam path through the image acquisition assembly 20, the sockets 60, 80 of the holding device are, as shown in the . Fig. 4 to 7 are shown in detail, developed. Fig. Figure 4 contains a schematic axonometric representation of the first version 60 in a first view.

[0093] In Fig. 4 shows the first flat surface area 73 of the foil component 70, which is attached to an edge area of ​​the first light-emitting surface 34 of the prism 30 (compare Fig. 1 to 3). Furthermore, the stop surface 62 on the first frame section 61 and the stop surface 64 on a second frame section 63 of the first version 60 are visible. The U-shaped arrangement of the first frame section 61 and the second frame sections 63 of the first version 60 is also visible, the stop surfaces 62, 64 of which define the arrangement and orientation of the first version 60 relative to the prism 30 in a form-fitting manner. The fourth frame sections 67 and a stop surface 68 on one of the fourth frame sections 67 are also visible.

[0094] Fig. Figure 5 contains a schematic axonometric representation of the first version 60 in a second view. It further shows Fig. 5 the first image sensor 40. The first image sensor 40 is shown spaced apart from the first socket 60. However, in the assembled state of the image acquisition assembly, the first image sensor 40 is oriented relative to the first socket 60 as shown in the diagram. Fig. Image acquisition unit 20 shown in 1 to 3.

[0095] In Fig. Figure 5 shows a second strip-shaped lateral edge surface 48 of the first image sensor 40. Furthermore, the second flat surface area 74 of the film component 70 is visible, which is designed to abut an edge area of ​​the light entry surface 43 of the first image sensor 40. The aforementioned U-shape of the film component 70 is also visible. Additionally, the stop surface 66 on the third frame section 65 and stop surfaces 68 on the fourth frame sections 67 of the first housing 60 are visible. Furthermore, the U-shaped arrangement of the third frame section 65 and the fourth frame sections 67 of the first housing 60 is visible, the stop surfaces 66, 68 of which form-fittingly define the arrangement and orientation of the first image sensor 40 relative to the first housing 60.

[0096] Fig. Figure 6 contains a schematic axonometric representation of the second version 80 in a first view.

[0097] In Fig. 6. The aforementioned circular topology of the second version 80 and the window 98 in the second version are recognizable. Furthermore, the first flat surface area 93 of the second version 80 is recognizable, which is located at an edge area of ​​the second light-exiting surface 35 of the prism 30 (compare Fig. 1 to 3). Furthermore, the stop surface 84 is visible on a second frame section 83 of the second version 80. The overall U-shaped arrangement of the first frame section 81 and the second frame sections 83 of the second version 80 is also visible, the stop surfaces 84 of which determine the arrangement and orientation of the second version 80 relative to the prism 30 (compare Fig. 1 to 3) define in a form-fitting manner.

[0098] Fig. Figure 7 contains a schematic axonometric representation of the second version 80 in a second view. It further shows Fig. 7 the second image sensor 50. The second image sensor 50 is shown spaced away from the second socket 80. However, the second image sensor 50 is oriented relative to the second socket 80 as shown in the diagram. Fig. Image acquisition unit 20 shown in 1 to 3.

[0099] In Fig. 7 A second strip-shaped lateral edge surface 58 of the second image sensor 80 is discernible. Furthermore, the second flat surface area 95 of the second housing 80 is discernible, which is designed to abut an edge area of ​​the light entry surface 53 of the second image sensor 50 (compare Fig. 1 to 3). Furthermore, the stop surface 86 on the third frame section 85 and stop surfaces 88 on fourth frame sections 87 of the second version 80 are recognizable. The U-shaped arrangement of the third frame section 85 and the fourth frame sections 87 of the second version 80 is also recognizable, the stop surfaces 86, 88 of which define the arrangement and orientation of the second image sensor 50 relative to the second version 80 in a form-fitting manner.

[0100] Although the invention is illustrated and described in detail by means of the figures and the accompanying description using exemplary embodiments of an image acquisition assembly according to the invention, these illustrations and their detailed descriptions are to be understood as illustrative and exemplary and not as limiting the invention. It is understood that those skilled in the art may make changes and modifications without departing from the scope of the technical features of the image acquisition assembly that define the invention. In particular, the present invention covers further exemplary embodiments with combinations of features that may differ from the exemplary embodiment shown in the figures. For example, the invention may also be implemented in the following form: - The first and second versions are either directly and rigidly connected mechanically or designed as a single unit. For example, the first frame section 61 of the first version 60 can be connected to the second version 80 in the area of ​​the third frame section 85. Consequently, the second version 80 does not have to be in contact with both the prism 30 and the second sensor 50. It can also be in contact only with the second sensor 50. - The stop of the first socket 60 can have a common stop surface for contact with the first stop surface 36 of the prism and the stop surface 46 of the first image sensor 40 and / or the stop of the second socket 80 can have a common stop surface for contact with a stop surface of the prism and with a stop surface of the second image sensor 50, for example the first stop surface 82 or the second stop surface 86. - The first and second versions can be designed as separate components, each attached laterally to the prism, for example at the points in Fig. The fifth surface region 37 shown in Figure 2 and the complementary, opposite sixth surface region. For this purpose, the sockets can be designed as wedge-shaped pieces that correspond to the lateral surface geometry of the prism, i.e., analogous to the shape of the fifth and sixth surface regions of the prism. The image acquisition assembly can have more than two image sensors. Two or more image sensors can be arranged on the same light-emitting surface of the prism. Two or more image sensors can be arranged on a single mount of the holding device, the stop of which advantageously has a stop surface for each image sensor. The prism can also have more than two light-emitting surfaces. The holding device has a mount for each light-emitting surface, which, analogous to the first mount 60 and the second mount 80, are adapted to the geometry of the prism or its light-emitting surfaces.

[0101] The exemplary embodiments listed include further features as shown in the example illustrated in the figures, even if they are shown there in conjunction with other features. It is readily apparent to a person skilled in the art from the description which features from the figures can be transferred to the exemplary embodiments listed. Reference symbol list 10 optical instrument 11 Shaft of the optical instrument 10 12 distal end of the shaft 12 of the optical instrument 10 20 Image acquisition assembly of the optical instrument 10 24 first at least partially flexible printed circuit board 25 second at least partially flexible printed circuit board 30 prisms of the image acquisition assembly 20 31 Light entry surface of the prism 30 32 dichroic reflective layer or interface of the prism 30 34 first light exit surface of the prism 30 35 second light exit surface of the prism 30 36 fourth flat surface area of ​​the prism 30, adjacent to the light emission surfaces 34, 35 37 fifth flat surface area of ​​the prism 30, adjacent to the light emission surfaces 34, 35 40 first image sensor of the image acquisition assembly 20 43 Light entry area of ​​the first image sensor 40 46 First strip-shaped lateral edge surface of the first image sensor 40 48 second strip-shaped lateral edge surface of the first image sensor 40 50 second image sensor of the image acquisition assembly 20 53 Light entry area of ​​the second image sensor 50 56 first strip-shaped lateral edge surface of the second image sensor 50 58 second strip-shaped lateral edge surface of the second image sensor 50 60 first version for the mechanically rigid mounting of the first image sensor 40 on the first light exit surface 34 of the prism 30 61 first framework section of the first version 60 62 Stop surface on the first frame section 61 of the first version 60, for bearing against or being arranged opposite the fourth flat surface area 36 of the prism 30 63 second framework section of the first version 60 64 Stop surface on the second frame section 63 of the first version 60, for bearing against or being arranged opposite the sixth flat surface area of ​​the prism 30 65 third framework section of the first version 60 66 Stop surface on the third frame section 65 of the first version 60, for bearing against or being arranged opposite the first strip-shaped lateral edge surface 46 of the first image sensor 40 67 fourth framework section of the first version 60 68 Contact surface on the fourth frame section 67 of the first version 60, for contact with or arrangement opposite the second strip-shaped lateral edge surface 48 of the first image sensor 40 69 Passage opening in the second frame section 63 of the first version 60 70 foil component 73 first flat surface area of ​​the foil component 70, adjacent to an edge area of ​​the first light emission surface 34 of the prism 30 74 second flat surface area of ​​the foil component 70, adjacent to an edge area of ​​the light entry surface 43 of the first image sensor 40 80 second version for the mechanically rigid mounting of the second image sensor 50 on the second light exit surface 35 of the prism 30 81 first framework section of the second version 80 82 Stop surface on the first frame section 81 of the second version 80, for contact with an edge area of ​​the light entry surface 31 of the prism 30 83 second framework section of the second version 80 84 Surface area on the second frame section 83 of the second version 80, for arrangement opposite the second flat surface area 37 of the prism 30 adjacent to the light emission surfaces 34, 35 85 third framework section of the second version 80 86 Contact surface on the third frame section 85 of the second version 80, for contact with the first strip-shaped edge surface 56 of the second image sensor 50 87 fourth framework section of the second version 80 88 Surface area on the fourth frame section 87 of the second version 80, for arrangement opposite the second strip-shaped edge surface 58 of the second image sensor 50 89 Passage opening in the second frame section 83 of the second version 80 93 at an edge area of ​​the second light-emitting surface 35 of the prism 30 first flat surface area of ​​the second socket 80 95 at an edge area of ​​the light entry surface 53 of the second image sensor 50 adjacent flat surface area of ​​the second socket 80 96 windows in the second version 80

Claims

[1] Image acquisition assembly, with: a beam-splitting prism (30) with a light-entry surface (31), a dichroic reflective layer (32) or interface, at least one first light-emission surface (34) and a second light-emission surface (35); at least two image sensors, wherein a first image sensor (40) is arranged at the first light-emission surface (34) of the prism (30) and a second image sensor (50) is arranged at the second light-emission surface (35) of the prism (30); and a holding device (60, 80) which has a first socket (60) and a second socket (80) for mechanically rigid connection of the first image sensor (40) and the second image sensor (50) with the prism (30), wherein the first version (60) has at least one stop for contact with a first stop surface (36) of the prism (30) and for contact with a stop surface (46) on the first image sensor (40) and the second version (80) has at least one stop for contact with a second stop surface (31; 93) of the prism (30) and / or for contact with a stop surface (56) on the second image sensor (50), and The stop of the second version (80) is intended to at least partially abut a surface area of ​​the prism (30) which includes the light entry surface (31) of the prism (30). [2] Image acquisition assembly according to claim 1, wherein the first version (60) and the second version (80) are two separate components that are attached separately to the prism. [3] Image acquisition assembly according to claim 1, wherein the first version and the second version are at least either directly mechanically rigidly connected or provided as a single unit. [4] Image acquisition assembly according to one of the preceding claims, wherein at least either a stop surface of the first socket (60) is orthogonal to the first light exit surface (34) of the prism (30) and / or is orthogonal to a light entry surface (43) of the first image sensor (40), or a stop surface of the second socket (80) is orthogonal to the second light exit surface (35) of the prism (30) and / or is orthogonal to a light entry surface (53) of the second image sensor (50). [5] Image acquisition assembly according to one of the preceding claims, wherein the stop of the first socket (60) has a common stop surface for bearing against the first stop surface (36) of the prism (30) and the stop surface (46) of the first image sensor (40) and / or the stop of the second socket (80) has a common stop surface for bearing against the second stop surface (31 or 93 of 80) of the prism (30) and / or against the stop surface (56) of the second image sensor (50). [6] Image acquisition assembly according to any one of the preceding claims 1 to 4, wherein the stop of the first socket (60) has a first stop surface (62) for bearing against the first stop surface (36) of the prism (30) and a second stop surface (66) for bearing against the stop surface (46) on the first image sensor (40), and / or the stop of the second socket (80) has a first stop surface (82) for bearing against the second stop surface (31; 93) of the prism (30) and a second stop surface (86) for bearing against the stop surface (56) on the second image sensor (50). [7] Image acquisition assembly according to claim 6, wherein at least either the first stop surface (62) of the first socket (60) is orthogonal to the intended orientation of the first light exit surface (34) of the prism (30) or the second stop surface (66) of the first socket (60) is orthogonal to the intended orientation of a light entry surface (43) of the first image sensor (40). [8] Image acquisition assembly according to claim 6, wherein at least either the first stop surface (82) of the second socket (80) is orthogonal to the intended orientation of the second light-exit surface (35) of the prism (30) or the second stop surface (86) of the second socket (80) is orthogonal to the intended orientation of a light entry surface (53) of the second image sensor (50). [9] Image capture assembly according to one of the preceding claims, wherein the stop of the first holder (60) is provided to bear against a surface area (36) of the prism (30) facing away from the light entry surface (31) of the prism (30). [10] Image acquisition assembly according to one of the preceding claims, wherein the stop of the first socket (60) has a stop surface for bearing against an edge region of the first light exit surface (34) of the prism (30) and a stop surface for bearing against an edge region of a light entry surface (43) of the first image sensor (40). [11] Image acquisition assembly according to one of the preceding claims, wherein the stop of the second socket (80) has a stop surface (93) for bearing against an edge area of ​​the second light exit surface (35) of the prism (30) and a stop surface (95) for bearing against an edge area of ​​a light entry surface (53) of the second image sensor (50). [12] Image acquisition assembly according to the preceding claim 10, wherein the first version (60) and / or the second version (80) comprises a foil component (70) with a first flat surface area (73) and a second flat surface area (74), the first flat surface area (73) and the second flat surface area (74) of the foil component (70) are parallel and facing away from each other, wherein the first flat surface area (73) of the foil component (70) forms the contact surface for contact with an edge area of ​​the first light-emitting surface (34) of the prism (30), and the second flat surface area (74) of the foil component (70) forms the contact surface for contact with an edge area of ​​a light entry surface (43) of the first image sensor (40). [13] Image acquisition assembly according to one of claims 10 to 12, wherein at least either the stop surface for contact with an edge area of ​​the first light exit surface (34) of the prism (30) and the stop surface for contact with an edge area of ​​a light entry surface (43) of the first image sensor (40) of the first mount (60) and / or the second mount (80) are each U-shaped or C-shaped or the stop surface (93) for contacting an edge area of ​​the second light exit surface (35) of the prism (30) and the stop surface (95) for contacting an edge area of ​​a light entry surface (53) of the second image sensor (50) of the first socket (60) and / or the second socket (80) are each U-shaped or C-shaped. [14] Image acquisition assembly according to one of claims 10 to 13, wherein at least either the stop surface for bearing against an edge region of the first light-emission surface (34) of the prism (30) and the stop surface for bearing against an edge region of a light-entry surface (43) of the first image sensor (40) of the first mount (60) or the stop surface (93) for bearing against an edge region of the second light-emission surface (35) of the prism (30) and the stop surface (95) for bearing against an edge region of a light-entry surface (53) of the second image sensor (50) of the second mount (80) are each annular. [15] Image acquisition assembly according to one of the preceding claims, wherein the dichroic reflecting layer or interface (32) of the beam-splitting prism (30) is arranged parallel to an angle-bisecting plane of the first light-exiting surface (34) and the second light-exiting surface (35), the first version (60) is U-shaped or C-shaped with an open side oriented towards the light entry surface (31) of the prism (30), and the second version (80) has a ring-shaped topology. [16] Image acquisition assembly according to one of the preceding claims, wherein at least either the first version (60) has at least three frame sections (61, 63, 65) which are each arranged opposite one of three different flat or substantially flat surface areas (36, 37) of the prism (30) adjacent to the first light-exiting surface (34) of the prism (30), or the second version (80) has at least three frame sections (81, 83) which are each arranged opposite one of three different flat or substantially flat surface areas (36, 37) of the prism (30) which adjoin the second light-exiting surface (35) of the prism (30). [17] Image acquisition assembly according to one of the preceding claims comprising: at least one through-hole (69, 89) in the first socket (60) and / or the second socket (80) for applying adhesive or solder for the material-bonded connection of the first socket (60) with the prism (30) and / or the second socket (80) with the prism (30). [18] Holding device for an image acquisition assembly with a beam-splitting prism (30) and at least two image sensors for mechanically rigidly holding a first image sensor (40) on a first light-exit surface (34) of the prism (30) and a second image sensor (50) on a second light-exit surface (35) of the prism (30), comprising: a first version (60) for the mechanically rigid connection of the first image sensor (40) with the prism (30), which has at least one stop for bearing against a first stop surface (36) of the prism (30) and for bearing against a stop surface (46) on the first image sensor (40), and a second socket (80) for mechanically rigid connection of the second image sensor (50) with the prism (30), which has at least one stop for bearing against a second stop surface (31) of the prism (30) and / or for bearing against a stop surface (82) on the second image sensor (50), wherein the stop of the second socket (80) is provided at least partially for bearing against a surface area of ​​the prism (30) which includes the light entry surface (31) of the prism (30). [19] Optical instrument (10) with: an image acquisition assembly (20) according to any one of the preceding claims 1 to 17. [20] Optical instrument (10) according to the preceding claim, further comprising: a shaft (11) with a distal end (12), wherein the image acquisition assembly (20) is arranged at the distal end (12) of the shaft (11).

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