Image acquisition device and method for manufacturing an image acquisition device

Abstract

Image acquisition device, in particular for coordinate measurement, wherein the image acquisition device (1) comprises at least one sensor (2), at least one sensor holder (3) and at least one element for fluid-based temperature control of at least the sensor holder (3), wherein the sensor holder (3) and the sensor (2) are arranged in an internal volume of a housing (4) of the image acquisition device (1), wherein the element for fluid-based temperature control serves to supply the sensor holder (3) with a fluid and comprises at least one base body (5), wherein the base body (5) comprises or forms at least one fluid supply section (6) and at least one outlet section (7), wherein fluid flows through the outlet section (7) into the internal volume, characterized by the fact that the outflow section (7) has or forms fluid outlets through which fluid can escape from the base body (5).

Description

[0001] The invention relates to an image capture device, in particular for coordinate measurement, and a method for producing such an image capture device.

[0002] Coordinate measurement for determining dimensional features of a measurement object using optical sensors, in particular image capture devices, is known from the prior art. Such image capture devices can comprise a CCD or CMOS sensor. Highly accurate measurements and measurements lasting longer, in particular distance measurements, require a constant spatial position of the image capture device, in particular the sensor, relative to the measurement object. Temperature fluctuations, which are generated, for example, by switching the image capture device on or off, can lead to a dimensional change in a support structure for the sensor, i.e., a sensor holder. Changing ambient temperatures can also affect the dimensions of the support structure. However, dimensional changes in the support structure change the position of the sensor relative to the measurement object. This, in turn, can lead to an undesirable reduction in measurement accuracy.

[0003] It is known to operate image capture devices, including the support structure, with virtually stable temperatures and to reduce warm-up phases by actively heating the image capture device. This heating can be achieved, for example, with internal elements of the image capture device, for example, through suitable operation of the sensor, but also with external heat generators such as Peltier elements, heating coils, or other elements. Temperatures are often set to relatively high temperatures in the range of 60°C or more to minimize the influence of changing ambient temperatures. However, disadvantages of this approach include uneven local heating of certain sections of the image capture device, high energy consumption, and unused waste heat.

[0004] Known from the prior art is DE 20 2018 102 586 U1, which discloses a housing arrangement for an electronic assembly that generates waste heat, wherein the components and / or heat sinks are located in different areas within the housing and extend at least partially at different heights, and with means for cooling.

[0005] DE 10 2016 202 422 A1 discloses a coolable camera device.

[0006] EP 0 337 416 A2 discloses a cooled probe housing, in particular for a combustion chamber probe with a television camera, with a hollow body enclosing the camera and the camera lens, having chambers through which coolant flows, and with a viewing opening arranged in the closure body of the hollow body, through which compressed air flows out, wherein the chambers are connected to cavities of the closure body in such a way that a forced coolant circuit is created across the closure body.

[0007] DE 12 86 086 A discloses a protective housing for industrial television cameras, which contains a cooling channel system through which a coolant flows.

[0008] US 2007 / 0065141 A1 discloses camera arrangements for viewing commercial combustion processes and in particular liquid-cooled combustion cameras.

[0009] DE 10 2012 213 813 A1 discloses a camera device for vehicles, in particular motor vehicles, as well as a vehicle with such a camera device for capturing at least one legally prescribed field of view.

[0010] US 5 847 927 A discloses electronic assemblies and in particular a support and housing structure for such assemblies which achieves high heat dissipation rates.

[0011] The technical problem is to create an image capture device and a method for producing such an image capture device which minimizes a change in the position of a sensor of the image capture device due to temperature fluctuations, wherein the temperature control and thus the thermal load are as uniform as possible and energy consumption is reduced to ensure this minimization.

[0012] The solution to the technical problem is achieved by the subject matter having the features of the independent claims. Further advantageous embodiments of the invention are set forth in the subclaims.

[0013] An image capture device is proposed. This device can be used, in particular, for coordinate measurement. In particular, the image capture device can form an optical sensor or part of an optical sensor of a coordinate measuring device. The image capture device can generate output signals, in particular in the form of one-, two-, or three-dimensional images, whereby dimensional features of a measurement object can be determined by evaluating one or more images generated by the image capture device. Corresponding methods are known to those skilled in the art.

[0014] In this case, it is possible for the image capture device and the measurement object to be moved relative to each other to determine the dimensional features. This can be achieved by moving the image capture device and / or by moving the measurement object.

[0015] The image capture device comprises at least one sensor, in particular a CCD sensor or a CMOS sensor. The sensor can be an area sensor. However, this is not mandatory, as other types of sensors can also be the subject of the present invention. The sensor generates an output signal, for example, an electrical output signal, wherein this output signal forms an output signal of the image capture device or the output signal of the image capture device is determined as a function of the sensor output signal.

[0016] The image capture device further comprises at least one sensor holder. The sensor is attached to the sensor holder, in particular in a stationary manner. The sensor holder can in particular be or comprise a support structure. The sensor holder is arranged in a housing of the image capture device. The sensor holder can be mechanically connected to the housing, in particular to a housing wall. Thus, the sensor can be mechanically connected to an external support element via the sensor holder and, if appropriate, via the housing.

[0017] The image capture device further comprises at least one element for fluid-based temperature control of at least the sensor holder. The fluid-based temperature control element can be used to adjust the temperature of the sensor holder or a predetermined section of the sensor holder to a desired target temperature. The fluid-based temperature control element can, in particular, be designed as a fluid flow guide and distribution element. Furthermore, the element is designed as an element for flowing a fluid onto the sensor holder.

[0018] The fluid may be a liquid fluid. However, the fluid is preferably a gaseous fluid, for example, air.

[0019] The image capture device may further comprise at least one means for beam guidance and / or beam shaping, in particular a lens. The lens may be part of an objective.

[0020] Furthermore, the element for fluid-based temperature control comprises at least one base body, wherein the base body comprises or forms at least one fluid supply section and at least one outflow section.

[0021] In particular, the element for fluid-based temperature control can comprise or be designed as an air bearing device, wherein the air bearing device comprises or forms the base body with the fluid supply section and the outflow section. Thus, such an air bearing device can be used as part of an element for fluid-based temperature control of the sensor holder. Thus, the element for fluid-based temperature control is designed as an air bearing device or part thereof. However, instead of air, a different fluid can be used for temperature control.

[0022] Air bearing devices are known in various designs. In addition to different sizes and geometries, air bearing devices also differ in the design of the fluid outlet. Some air bearing devices, for example, allow fluid to flow through a centrally located throttle bore. Other air bearing devices have throttle bores arranged radially around a bearing center axis on a circular line with a defined diameter.

[0023] Air bearing devices—and thus the base body or parts thereof—can usually be made of metals, particularly aluminum, steel, or brass. Machining processes are used to create a desired configuration from a solid body. For example, outlet openings can be created through drilled holes. Thus, elements for fluid supply and fluid outlets can be manufactured using machining processes.

[0024] The base body can have a bionic structure. A bionic structure can, in particular, be a honeycomb structure, a star structure, a tree structure, or a bone structure. The bionic structure can also be a vaulted structure. Bionic structures can, in particular, refer to structures whose geometric design is based on or similar to natural structures, i.e., structures found in nature. One advantage here can be high load-bearing capacity combined with low weight.

[0025] The section with a bionic structure can in particular be arranged on an underside or back side of the base body or form the underside or back side.

[0026] Sections of the base body other than the outlet section can also be made of metal, ceramic, or plastic. A metal alloy is also a possible material.

[0027] Elements for fluid guidance and / or fluid outlet can be integrated into the base body or formed by it.

[0028] The geometric design can be selected depending on a position and / or shape and / or number of fluid inlet openings, fluid outlet openings, fluid channels in the base body, fluid connection devices and / or fluid chambers.

[0029] It is possible for the base body to have a rectangular base, a square base, a circular base, or a polygonal base. The base body can be oriented orthogonally to a central axis of the base body. In other words, the base body can have a rectangular, square, circular, or polygonal cross-section in a cross-sectional plane perpendicular to the central axis of the base body. In the assembled state, the central axis can extend from the base body from a rear side to a front side of the base body. In particular, the central axis can be oriented perpendicular to an outflow surface formed by the outflow section, in particular on a front side of the base body.

[0030] The base body can have or form a top or front side. The outflow surface can be arranged on the front side. The bottom or back side can refer to a side of the base body opposite the front side. The central axis can extend from the bottom / back side to the top / front side.

[0031] Different sections of the base body can be formed by the monolithic base body. In other words, the different sections are formed integrally. Alternatively, the different sections can also be formed by separate components.

[0032] The base body can further comprise or form at least one connection device or a connection interface for pneumatic supply means, for example, lines. Such connection interfaces can be arranged, for example, on a side wall of the base body and / or on a bottom wall or rear side of the base body.

[0033] In particular, the outflow section can be arranged on the front side of the base body. According to the invention, the outflow section has or forms fluid outlets through which fluid can escape from the base body. Thus, the outflow body can have or form the outflow surface of the base body.

[0034] The fluid outlet openings of the outflow body can be pneumatically connected to fluid channels in the base body or to the fluid outlet channels of the outflow section.

[0035] In particular, the base body can have or form one or more, in particular two, fluid outlet channel(s). A fluid outlet channel can be pneumatically connected to a fluid connection device of the base body, in particular via at least one connecting channel. Furthermore, the outflow section can be pneumatically connected to the at least one fluid outlet channel, wherein the outflow section provides the outflow area.

[0036] These fluid outlet channels can, in particular, be channel-shaped. A cross-section of a fluid outlet channel in a cross-sectional plane perpendicular to a central axis of the fluid outlet channel can, in particular, be partially circular or semicircular. For example, a fluid outlet channel can be formed as a groove on a top or front side of the base body. A central axis of a fluid outlet channel can be arranged in a plane oriented perpendicular to the central axis of the base body. However, it is also possible that a central axis of a fluid outlet channel is oriented at a predetermined angle, which may be different from 0° or 180°, with respect to the central axis of the base body. A fluid outlet channel can be connected to a fluid connection device or a fluid connection opening of the base body via at least one connecting channel. As explained below, a connecting channel can preferably have at least one section with a curved profile. A fluid outlet channel can also have a curved profile. Preferably, a fluid outlet channel is a closed channel. Thus, a central axis of such a fluid outlet channel can be, for example, circular, oval, rectangular, or square.

[0037] The outflow section can, for example, be plate-shaped or comprise a plate-shaped outflow body. Such an outflow body may have one or more bores, particularly throttle bores.

[0038] Different sections of the base body can be formed from the monolithic base body. In other words, the different sections are formed integrally. It is therefore possible for the base body to form the outflow section. Thus, it is possible for a monolithically formed base body to have the outflow section. In other words, different sections of the outflow section can also be formed from the material of the outflow section. This ensures that only one material is used to manufacture the air bearing device, which simplifies the manufacturing process and avoids the potentially undesirable combination of multiple materials.

[0039] Alternatively, the different sections of the base body can also be formed by separate components.

[0040] The base body, in particular the outflow section, can be arranged and / or configured such that the sensor holder, in particular a predetermined section of the sensor holder, and optionally the sensor, are exposed to the fluid flowing out of the base body through the outflow section. In particular, the sensor holder can be exposed to the fluid flowing out over a large area. This can mean that the fluid flows out from a predetermined portion of the outflow area of ​​the outflow section, wherein this portion is, for example, greater than 50%, preferably greater than 75%, more preferably greater than 90%.

[0041] It is further possible for the outflow section, in particular the outflow surface, to have a desired surface structure, for example a ribbed structure, in particular in order to provide a desired size of an outflow surface.

[0042] This fluid can have a predetermined temperature. This can be adjusted, for example, by a fluid temperature control device. This device can be, for example, a heating device and / or a cooling device.

[0043] In particular, a preferably laminar fluid flow can flow (continuously) at a desired temperature through the outflow section toward the sensor holder. If the sensor holder is arranged in an internal volume of a housing of the image capture device, this fluid flow also flows into the internal volume. This allows the temperature of the sensor holder or the internal volume of the image capture device to be kept constant. In particular, temperature-related dimensional changes of the sensor holder due to switching the image capture device, in particular the sensor, on and off, and / or a changing ambient temperature can be reduced.

[0044] The use of a base body with at least one outflow section for fluid-based temperature control advantageously results in reliable and uniform temperature control of at least the sensor holder, which can be exposed to the outflowing fluid over a large area. This minimizes deformation or dimensional changes of the sensor holder caused by temperature fluctuations, since the temperature of the sensor holder can be adjusted as consistently as possible via the fluid flow. This, in turn, enables improved measurement accuracy when the image capture device is part of a coordinate measuring system.

[0045] In a further embodiment, the at least one outflow section is formed from a fluid-permeable material. The fluid-permeable material can be a material that can be flowed through flatly or volume-wise.

[0046] In particular, the fluid-permeable material can be a porous material, e.g., a porous metal, especially aluminum. For example, it is thus possible for the fluid-permeable material to be a material with a predetermined porosity and / or a predetermined grain size, which is selected such that at least one predetermined property of the fluid flowing out of the outflow section, for example, a flow velocity and / or a volume flow, can be provided by the material.

[0047] This advantageously results in a particularly simple provision of an outflow section with a large outflow area through which fluid can flow out evenly.

[0048] In a further embodiment, the fluid-permeable material is a sintered material. A sintered material refers to a material produced by sintering. However, the manufacturing process can also include further process or manufacturing steps in addition to sintering. For example, the sintered material can be a sintered ceramic material or a sintered metal material. Since sintering processes are established manufacturing methods, this results in simple and reliable production of the fluid-permeable material with desired, in particular predetermined, properties, e.g., a desired porosity and / or grain size.

[0049] Alternatively, the fluid-permeable material can be a cast material. A cast material here refers to a material produced by a casting process. In this case, the production process can comprise further process or production steps in addition to casting. The cast material can be a metal material, for example. For example, this can be cast into a desired shape with a placeholder material, e.g. a crystal salt, whereby the placeholder material is removed after casting, e.g. by washing out. Since casting processes are established production methods, this also results in simple and reliable production of the fluid-permeable material with desired, in particular predetermined, properties, e.g. a desired porosity and / or grain size.

[0050] Alternatively, the fluid-permeable material is a foam material. A foam material here refers to a material produced by foaming. In addition to foaming, the manufacturing process can also include further process or manufacturing steps. The foam material can, for example, be a metal material, allowing the production of a metal foam. Corresponding manufacturing processes, i.e., processes for foaming, are known to those skilled in the art. Since foamed materials advantageously have a low weight and high breaking strength, the weight of the proposed image capture device can also be reduced and its breaking strength increased.

[0051] In a further embodiment, the fluid-permeable material is a fluid-permeable graphite, a fluid-permeable carbon fiber reinforced plastic, or a combination of these materials.

[0052] It is possible that the fluid-permeable material is a graphite foam material or a sintered graphite material. It is also possible that the fluid-permeable material is a plastic foam material or a plastic sintered material.

[0053] The fluid permeability of the graphite can be adjusted by its porosity and / or grain size. The carbon fiber-reinforced plastic can, in particular, be carbon fiber-filled polyamide, which can, in particular, comprise microcarbon fibers.

[0054] Since graphite and carbon fiber-reinforced plastic, especially carbon, are lightweight and have high rigidity for a specific weight, this advantageously results in the provision of an element for fluid-based temperature control with reduced weight and / or higher rigidity compared to outflow sections made of solid material. In particular, a similar rigidity to that of solid material can be achieved, but with a reduced weight. This increases the weight of the image capture device as well as its rigidity and thus its mechanical load-bearing capacity.

[0055] In a further embodiment, the element for fluid-based temperature control has or forms at least one connection device for supplying fluid to the base body. Thus, the base body can have or form at least one connection device or a connection interface for pneumatic or hydraulic supply means, for example, lines. Such connection interfaces can be arranged, for example, on a side wall of the base body and / or on a bottom wall or rear side of the base body.

[0056] It is conceivable that a connection device for fluid supply or fluid removal is attached to the base body or the housing. For this purpose, the housing and / or the base body can, for example, have or form a threaded bore that serves to attach such a connection device or to provide such a connection device. Such a thread can, for example, be provided by a threaded insert that is arranged in / on the base body or the housing, for example, embedded in it. Such a thread can also be produced by an EDM process.

[0057] Of course, other ways of fastening the connection device or a part thereof to the base body or the housing are also conceivable.

[0058] This advantageously results in a reliable supply of the fluid used for temperature control to the base body. This, in turn, advantageously ensures the reliable setting of the desired temperature of the sensor holder and thus the reduction of dimensional changes of this sensor holder, which in turn results in the advantages explained above.

[0059] In a preferred embodiment, the image capture device comprises a housing, wherein the base body is arranged in the housing or forms at least part of a housing wall of the housing. In addition to the base body, the sensor holder and the sensor can also be arranged in an interior volume of the housing. The sensor holder can be arranged in the part of the interior volume into which fluid also flows from the outflow section.

[0060] A means for beam guidance and / or beam shaping can also be arranged at least partially within the housing. If the base body forms part of the housing wall, the previously explained connection device can be accessible from outside the housing. If the base body with the connection device is arranged within the housing, the housing can also comprise or form a connection device for fluid supply, which can be fluidically connected to the connection device of the base body.

[0061] The housing may further comprise or have at least one opening for the fluid to flow out of the housing. This opening may be an outflow opening, which in turn may be part of a connection device for fluid removal. Fluidic connecting elements, such as lines, may be connected to such a connection device, through which the fluid flowing out of the outflow section, into the interior volume of the housing, and then out of the housing through the outflow opening, is removed.

[0062] However, it is also possible for the at least one outflow opening to be an opening to an external environment of the housing. In this case, the fluid flowing out of the housing can flow into the external environment. This advantageously ensures reliable discharge of the fluid flowing into the internal volume of the housing, thereby advantageously avoiding undesirably high pressures and / or undesirable pressure changes in the internal volume, which could adversely affect the operation of the sensor and / or lead to undesirable mechanical stresses on the image capture device.

[0063] In a further embodiment, the housing has or forms at least one opening for the outflow of the fluid. This was previously explained with corresponding technical advantages.

[0064] The dimensions of an opening can be selected in particular such that, when fluid is supplied at a predetermined flow velocity and / or a predetermined volume flow, a predetermined overpressure is established in the interior volume of the housing. This advantageously prevents the penetration of foreign bodies from the exterior volume. The dimensions can be selected such that the pressure in the interior volume can be greater than a first predetermined pressure threshold, which can be equal to an ambient pressure value, for example, and less than a further predetermined pressure threshold, which can be equal to a maximum permissible operating pressure of the sensor, for example.

[0065] Of course, it is also possible that at least one property of the fluid flow into the internal volume is adjusted in such a way that the pressure conditions explained result.

[0066] In a further embodiment, the housing is partially or completely formed from the fluid-permeable material. In particular, sections of the housing can be formed from the fluid-permeable material, which define a volume into which the fluid flowing out of the outflow section flows. Remaining sections can be formed from a different material.

[0067] Constructing at least a portion of the housing from the aforementioned fluid-permeable material advantageously results in reliable fluid drainage from the interior volume and, at the same time, a low thermal expansion coefficient of the housing, which in turn can result in reduced positional change of the sensor holder, for example, attached to the housing, in the event of temperature fluctuations. The previously discussed good mechanical properties, in particular high rigidity, and low weight of the image capture device are also achieved.

[0068] In a further embodiment, at least a portion of a surface of the fluid-permeable material is sealed. In particular, a surface of the outflow section can be sealed. A portion of an inner or outer surface of the housing, in particular a housing wall, can also be sealed.

[0069] If the base body is also made of the fluid-permeable material, at least part of a surface of the base body can also be sealed.

[0070] For example, if the outflow surface is located on the front side of the base body, the side surface(s) of the base body and the rear side of the base body can be sealed. Sealing can be achieved by coating with a fluid-impermeable lacquer or a fluid-impermeable adhesive.

[0071] It is of course possible that a through-opening is provided through the seal, for example for the previously explained connection device for fluid supply or the connection device for fluid removal.

[0072] If at least part of a surface of the fluid-permeable outflow section is sealed, the size of the sealed surface(s), the shape of the sealed surface(s), and / or the arrangement of the sealed surface(s) can be selected, for example, such that desired outflow properties of the fluid are provided, in particular a desired outflow direction, a desired outflow velocity, and / or a desired (maximum) volume flow. In particular, the sealing can achieve a reduction in the flow of the fluid through the outflow section. The same applies to the sealing of the housing formed with fluid-permeable material.

[0073] In a further embodiment, the outflow section is formed by a plate-shaped outflow body or a plate-shaped subsection of the base body. It is possible for the base body or an outflow body to have one or more bores, in particular one or more throttle bores, with the outflow surface of the outflow section being fluidically connected to these bores. This advantageously results in a surface for the outflow of fluid that is as uniform as possible and thus a fluid flow that is as laminar as possible, which in turn leads to the most uniform temperature control of the sensor holder.

[0074] In a preferred embodiment, the outflow section is arranged and / or configured such that the outflowing fluid flows toward the rear side of the sensor and / or the sensor holder. This advantageously ensures that the signal generation by an active surface of the sensor arranged on the front side of the sensor holder is not disrupted as much as possible by the fluid flow and any particles transported by it. This, in turn, leads to high-quality images generated by the image capture device.

[0075] In a further embodiment, the image capture device comprises a fluid guide, for example in the form of a line, which in turn can be designed as a hose or tube. Furthermore, the image capture device comprises at least one fluid temperature control means for setting a desired temperature of the fluid flowing in the fluid guide. Furthermore, the image capture device comprises at least one fluid pump for generating a fluid flow in the fluid guide. The fluid guide means can be fluidically connected to the previously explained connection device(s) of the housing or the base body.

[0076] This advantageously results in a fluid with a desired, in particular adjustable, temperature being supplied to the base body and then flowing out through the outflow section to the sensor holder. Furthermore, at least one flow characteristic, for example, a flow velocity or fluid pressure, can be adjusted by the fluid pump.

[0077] This in turn advantageously enables the provision of a fluid flow flowing out of the outflow section with desired properties, which in turn enables reliable temperature control of the sensor holder.

[0078] In a further embodiment, the at least one fluid conducting means, the at least one fluid temperature control means, and the at least one fluid pump are part of a closed fluid circuit. This can also comprise the base body of the element for fluid-based temperature control. The closed fluid circuit can also comprise the housing.

[0079] Furthermore, the image capture device can comprise at least one control device for setting a desired temperature by controlling the fluid temperature control medium. This can be designed as a microcontroller or integrated circuit or can comprise one of these.

[0080] Furthermore, the image capture device can comprise a device for converting thermal energy into electrical energy, by which the thermal energy of the fluid flowing out of the housing and / or the thermal energy of the fluid pump can be converted into electrical energy. This electrical energy can be used to operate the fluid pump, the sensor, and / or the fluid temperature control medium. For this purpose, the electrical energy can be stored, for example, in a suitable storage device of the image capture device.

[0081] This advantageously enables energy recovery, which advantageously reduces energy consumption during operation of the image capture device.

[0082] Furthermore, a method for producing an image capture device, in particular for coordinate measurement, is proposed.

[0083] The procedure includes the following steps: - Provision of at least one sensor, - Provision of at least one sensor holder, - Attaching the sensor to the sensor holder, - Providing at least one element for fluid-based temperature control of at least the sensor holder, wherein the element for fluid-based temperature control comprises at least one base body, wherein the base body comprises or forms at least one fluid supply section and at least one outflow section, - Arranging the element for fluid-based temperature control in such a way that the sensor holder is exposed to the fluid flowing out through the outflow section, wherein the outflow section has or forms fluid outlets through which fluid can escape from the base body.

[0084] The method advantageously serves to produce an image capture device according to one of the embodiments described therein. Thus, the method can comprise all steps necessary to produce such an image capture device.

[0085] It is possible for the base body, and in particular the fluid supply section, to be produced using an additive manufacturing process. An additive manufacturing process can, in particular, be a selective laser sintering process or a fused deposition modeling process. Of course, other additive manufacturing processes are also conceivable.

[0086] Alternatively, it is also conceivable to produce both the fluid supply section and the outflow section of the base body using an additive manufacturing process. This allows the outflow surface and / or air outlet openings in the outflow surface to be formed during production to provide the desired properties of the outflowing fluid stream. For example, it is also possible to adjust a desired porosity.

[0087] After such production, post-processing of the outflow surface may be necessary, e.g., polishing, which can be performed using a suitable polishing agent, e.g., a rag. This advantageously simplifies the production, particularly of complex structures of the base body, and more particularly of the feed body.

[0088] Also described is a coordinate measuring device with an image capture device according to one of the embodiments described in this disclosure, wherein the image capture device forms an optical sensor of the coordinate measuring device or a part thereof. Further described is a method for operating an image capture device according to one of the embodiments described in this disclosure, wherein a fluid is supplied to the base body via the at least one fluid supply section. Furthermore, the desired target temperature of the fluid can be set.

[0089] The invention is explained in more detail using exemplary embodiments. The figures show: Fig. 1 a schematic representation of an image capture device according to the invention, Fig. 2 a schematic representation of an image capture device according to the invention in a further embodiment, Fig. 3 a schematic representation of an image capture device according to the invention in a further embodiment, Fig. 4 a schematic representation of an image capture device according to the invention in a further embodiment, Fig. 5 a perspective view of a base body with fluid channels, Fig. 6 a perspective view of a basic body and Fig. 7 a schematic flow diagram of a method according to the invention for producing an image capture device.

[0090] In the following, the same reference symbols designate elements with the same or similar technical features.

[0091] Fig. Figure 1 shows a schematic view of an image capture device 1 according to the invention. This image capture device 1 comprises a sensor 2, which can be designed, for example, as a CMOS or CCD sensor. The image capture device further comprises a sensor holder 3, which is plate-shaped in the illustrated embodiment. The sensor 2 is attached to a first side, in particular a front side, of the sensor holder 3. The sensor 2 is a planar sensor for generating two-dimensional images.

[0092] The image capture device 1 further comprises a housing 4 with a housing wall, wherein the sensor holder 3 and the sensor 2 are arranged in an interior volume of the housing 4, which is enclosed by the housing wall. In particular, the sensor holder 3 is mechanically connected to the housing 4 and arranged in a fixed position relative to the housing 4.

[0093] Furthermore, the image capture device 1 comprises a base body 5, wherein this base body 5 comprises a fluid supply section 6 and an outflow section 7. It is shown that the base body 5 forms part of the housing wall of the housing 4. In the Fig. In the embodiment shown in Figure 1, the fluid supply section is formed by a supply body. The outlet body and the supply body are formed separately from one another. The outlet section is formed by an outlet body that is attached to the supply body. One material of the outlet body is a fluid-permeable material, in particular a porous material. Such a material can be a sintered material, a cast material, a foam material, a graphite material, or a fluid-permeable carbon fiber-reinforced plastic, or a combination of these materials. The supply body, in turn, is formed from a fluid-impermeable material, preferably from fluid-impermeable graphite. Of course, the fluid-impermeable material can also be a sintered material, a cast material, a foam material, or a fluid-impermeable carbon fiber-reinforced plastic, or a combination of these materials.

[0094] In Fig. 1 shows that the outflow body forming the outflow section 7 is plate-shaped and is glued to the feed body.

[0095] The feed body forms the previously explained part of the housing wall.

[0096] It is further shown that the base body 5, in particular the feed body, has a connection device 8 for a fluid supply, in particular for allowing fluid to flow into the base body 5, in particular the feed body. This connection device 8 is arranged on a side wall 9 of the base body 5, in particular the feed body, and thus of the housing 4. A fluid can flow into the base body 5 through this connection device 8. The base body 5, in particular the feed body forming the fluid supply section, has fluid channels 9, although for the sake of clarity, only one fluid channel 9 is shown. This fluid channel establishes a fluidic connection between the connection device 8 and throttle bores 10 in the feed body, the fluid channel 9 being connected by the throttle bores 10 to the surface of the feed body to which the outflow body is glued.The entirety of the fluid channel 9 and throttle bores 10 thus serves for the fluidic connection of the connection device 8 with the outflow section 7.

[0097] It can be seen that due to the shown design of the base body 5, fluid can be distributed to different areas of the outflow section 7 and can thus flow out of an outflow surface 17 formed by the outflow section 6 into the inner volume of the housing 4.

[0098] The flow direction of a fluid is shown schematically by arrows 11, which flows through the connection device 8 into the fluid channel 9 and through this into the outflow section 7 and from this into the inner volume of the housing 4.

[0099] It is further shown that the outflow section 7 is arranged and designed in the inner volume of the housing 4 in such a way that the fluid flowing out of the outflow section 7 flows onto another side of the sensor holder 3, in particular its rear side.

[0100] It is further shown that the housing 4, in particular the housing wall, has through-openings 12 through which the inner volume is fluidically connected to an external environment of the housing 4. The fluid flowing out of the outflow section 7 can flow through these openings 12 into the outer volume.

[0101] The adhesive layer between the supply body and the outlet body can be designed such that fluid can flow from the supply body into the outlet body. For example, the adhesive layer can be arranged only in partial sections of the surfaces of the supply body and the outlet body that are attached to one another.

[0102] Also shown is a lens 13 of the image capture device 1, which is attached to the housing 4.

[0103] Fig. Figure 2 shows a schematic representation of an image capture device 1 according to the invention according to a further embodiment. In contrast to the Fig. In the embodiment shown in Figure 1, the image capture device 1 comprises connection devices 14 for fluid removal from the interior volume of the housing 4. These connection devices 14 serve to connect fluid guide means 15, which can be designed, for example, as fluid lines. The connection devices 14 are fluidically connected to the interior volume via through-openings 12 in the housing wall. Also shown is a fluid guide means 15, which is connected to the connection device 8 for fluid supply. It is also shown that the image capture device 1 comprises a device 16 for fluid temperature control and generation of the fluid flow. This device 16 can, for example, comprise a fluid pump. Furthermore, the device 16 can comprise a heating and / or cooling device for adjusting a temperature of the fluid, in particular of the fluid flowing to the connection device 8.It is thus evident that a closed fluid circuit is formed, which includes, among other things, the housing 4, the fluid guide means 15, and the device 16. The through-openings 12 can be designed in the form of slots.

[0104] The housing 4, in particular the feed body, can be made of aluminum, steel, but also the fluid-permeable material.

[0105] Fig. Figure 3 shows a schematic view of an image capture device 1 according to another embodiment. In contrast to the Fig. 1, the base body 5 is made entirely of fluid-permeable material and forms both the supply section 6 and the discharge section 7. Thus, in contrast to the embodiment shown in Fig. 1, the fluid supply section 6 and the outflow section 7 are not formed from separate bodies. Rather, the base body 5 can be monolithic, with the fluid supply section 6 and the outflow section 7 being sections of the same base body 5. However, sections of the housing 4 that are different from the base body 5 are formed from a different material than the base body 5.

[0106] It is further shown that the base body 5, and thus the housing 4, has a connection device 8 for fluid supply. As previously explained, fluid can flow into the base body 5 through this connection device. Also shown is a fluid channel 9, which is fluidically connected to the connection device 8 and through which fluid flowing through the connection device 8 is transported into the base body 5 and to the outflow section 7 of the base body 5.

[0107] It is further shown that various surfaces of the base body 5, in particular the side surfaces and the rear surface, are sealed from the outflow surface 17 of the outflow section 7, namely by a sealing layer 18. This can be formed, for example, as a lacquer or adhesive layer. This layer 18 is fluid-impermeable. In particular, no fluid can escape from the base body 5 through it.

[0108] It is further shown that the outflow surface 17 of the outflow section 7 is also sealed in partial areas, namely also by a sealing layer 18. This ensures that fluid can only flow out of the base body 5 in certain partial areas of the outflow surface 17. This can be taken into account for adjusting the properties of the outflowing fluid flow, in particular for setting a desired volume flow and a desired flow velocity, but also for targeted flow to selected sections of the sensor holder 3.

[0109] Fig. Figure 4 shows a schematic view of an image capture device 1 according to the invention in a further embodiment. In contrast to the Fig. In the embodiment shown in Figure 3, the entire housing 4 of the image capture device 1, including the base body 5, is made of the fluid-permeable material. A further difference is that the image capture device 1 has a plurality of connection devices 8 for fluid supply, through which fluid can flow into the housing 4, in particular into the housing wall or housing body formed from the fluid-permeable material. Also shown are the openings 12 for fluidically connecting the interior volume of the housing 4 and the exterior volume. Also shown is a sealing layer 18, which seals all exterior surfaces of the housing 4 except for the areas of the connection devices 8 and the through-openings 12.

[0110] Also shown are fluid channels 9, through which fluid flowing in through the connection devices 8 can flow into the housing body of the housing 4. The housing body 4 here refers to the body comprising the internal volume. The fluid can, in particular, be air. However, it is also possible for the fluid to be a liquid fluid. The fluid can, in particular, be a gaseous fluid.

[0111] Fig. 5 shows a perspective view of a feed body of a base body 5 (see Fig. 1) with fluid channels 9. This body can be made of carbon fiber filled polyamide and manufactured by an additive manufacturing process.

[0112] Fig. 6 shows a perspective view of a base body 5, which Fig. 3 and an outflow body made of fluid-permeable graphite, which forms an outflow section 7.

[0113] Fig. 7 shows a schematic flow diagram of a method according to the invention for producing an image capture device 1 (see Fig.1). In a first step S1, a sensor 2 is provided. In a second step S2, a sensor holder 3 is provided. In a third step S3, the sensor 2 is attached to the sensor holder 3. Furthermore, the sensor holder 3 with the sensor 2 attached thereto can be arranged in an internal volume of a housing 4 of the image capture device 1. In a fourth step S4, a base body 5 is provided, which comprises or forms at least one fluid supply section 6 and at least one outflow section 7. In a fifth step S5, this base body 5 is arranged such that the fluid flowing out through the outflow section 7 flows against the sensor holder 3. For this purpose, the base body 5 can be arranged in the internal volume of the housing 4. The base body 5 can also be part of the housing 4, as described above. List of reference symbols 1 image capture device 2 sensors 3 sensor holders 4 Housing, housing body 5 basic bodies 6 Fluid supply section 7 Outflow section 8 Connection device for fluid supply 9 Side wall 10 throttle bore 11 Arrow 12 passage opening 13 Lens 14 Connection device for fluid discharge 15 Fluid line 16 Facility 17 Outflow area 18 shift S1 first step S2 second step S3 third step S4 fourth step S5 fifth step

Claims

[1] Image capture device, in particular for coordinate measurement, wherein the image capture device (1) comprises at least one sensor (2), at least one sensor holder (3) and at least one element for fluid-based temperature control of at least the sensor holder (3), wherein the sensor holder (3) and the sensor (2) are arranged in an internal volume of a housing (4) of the image capture device (1), wherein the element for fluid-based temperature control serves to flow a fluid onto the sensor holder (3) and comprises at least one base body (5), wherein the base body (5) comprises or forms at least one fluid supply section (6) and at least one outflow section (7), wherein fluid flows through the outflow section (7) into the internal volume, characterized by , that the outflow section (7) has or forms fluid outlets through which fluid can escape from the base body (5). [2] Image capture device according to claim 1, characterized by that the at least one outflow section (7) is made of fluid-permeable material. [3] Image capture device according to claim 2, characterized by that the fluid-permeable material is a sintered material, a cast material or a foam material. [4] Image capture device according to claim 2 or 3, characterized by that the fluid-permeable material is a fluid-permeable graphite or a fluid-permeable carbon fiber reinforced plastic or a combination of these materials. [5] Image capture device according to one of the preceding claims, characterized by that the element for fluid-based temperature control has or forms at least one connection device (8) for fluid supply. [6] Image capture device according to one of the preceding claims, characterized bythat the image capture device (1) comprises a housing (4), wherein the base body (5) is arranged in the housing (4) or forms at least part of a housing wall of the housing (4). [7] Image capture device according to claim 6, characterized by that the housing (4) has or forms at least one opening (12) for the outflow of the fluid. [8] Image capture device according to one of claims 6 or 7, characterized by that the housing (4) is partially or completely made of the fluid-permeable material. [9] Image capture device according to one of claims 2 to 8, characterized by that at least part of a surface of the fluid-permeable material is sealed. [10] Image capture device according to one of the preceding claims, characterized by that the outflow section (7) is formed by a plate-shaped outflow body or a plate-shaped partial section of the base body (5). [11] Image capture device according to one of the preceding claims, characterized by that the outflow section (7) is arranged and / or designed such that the outflowing fluid flows onto a rear side of the sensor (2) and / or the sensor holder (3). [12] Image capture device according to one of the preceding claims, characterized by that the image capture device (1) comprises at least one fluid guiding means (15), at least one fluid tempering means and at least one fluid pump. [13] Image capture device according to claim 12, characterized by that the at least one fluid guide means (15), the at least one fluid temperature control means and the at least one fluid pump are part of a closed fluid circuit. [14] Method for producing an image capture device (1), in particular for coordinate measurement, comprising the steps • Provision of at least one sensor (2), • Provision of at least one sensor holder (3), • Arranging the sensor holder (3) and the sensor (2) in an internal volume of a housing (4) of the image capture device (1), • Attach the sensor (2) to the sensor holder (3), • Providing at least one element for fluid-based temperature control of at least the sensor holder (2) by flowing a fluid onto the sensor holder (3), wherein the element for fluid-based temperature control comprises at least one base body (5), wherein the base body (5) comprises or forms at least one fluid supply section (6) and at least one outflow section (7), • Arranging the element for fluid-based temperature control in such a way that fluid flows through the outflow section (7) into the internal volume and the sensor holder (3) is flowed against by the fluid flowing out through the outflow section (7), characterized bythat the outflow section (7) has or forms fluid outlets through which fluid can escape from the base body (5).

Images