Illumination device for illuminating a surface, and lens structured on two sides

Abstract

The invention relates to an illumination device for illuminating a surface, particularly an operation field. The device has a plurality of illumination segments (10) which are arranged at least to some extent next to one another. Each illumination segment (10) has a light source (12), a lens (14) and an at least partial shield (16). The light source (12) is arranged and designed to emit light. The light source represents the start of a beam path. The lens (14) is arranged and designed to at least partially receive and output the emitted light. The at least partial shield (16) is arranged and designed to at least partially shield the lens (14) from light emitted from adjacent light sources and / or stray light from the surroundings.

Description

[0001] Lighting device for illuminating a surface and double-sided structured lens

[0002] Herein, a method and a device for illuminating a surface, in particular a surgical field, and a double-sided structured lens are presented.

[0003] The illumination of surfaces is important in many areas. In medical technology, for example, the illumination of an operating field is crucial for performing an operation, as is the illumination of the oral cavity in dental technology. Lighting devices are also frequently used in veterinary medicine as veterinary lights. The operating field in which a surgical procedure takes place must be illuminated in such a way that a surgeon can clearly see the existing tissue and move safely within the operating field with the surgical instruments. The same applies to dental technology, where the oral cavity must be well illuminated so that a practitioner can identify and, if necessary, treat damage to the teeth and / or gums and / or oral tissue.

[0004] Surface illumination is also important in other areas, such as the illumination of buildings in architecture. It is also important in areas where precision assembly is carried out and shadows influence the assembly work, such as in watchmaking.

[0005] Prior art lighting devices for illuminating a surface, such as a surgical field or oral cavity, disclose that, for correct illumination of the surface, the corresponding device is held in a designated position. The light field that illuminates the surface, e.g.,

[0006] The light that illuminates the surgical field, for example, is moved along the surface by pivoting the entire lighting fixture. This is complex and particularly space-consuming. A relatively large space must be provided to accommodate the pivoting movement of the lighting fixture. During pivoting, collisions often occur between the light and other devices, such as monitors, superstructures, or C-arms.

[0007] There is a need for an improved lighting device. The lighting device should, in particular, enable the simple illumination of a surface, for example, a surgical field. In particular, the resulting light field should be adaptable. Furthermore, there is a need for an improved lens that can be used, for example, in such a lighting device.

[0008] The object is achieved with a lighting device according to claim 1, a method according to claim 20, a lens according to claim 21 and / or a lighting or exposure device according to claim 27.

[0009] In the following, an operating field may be referred to as an example of a surface to be illuminated. This is to be understood purely as an example. Instead of an operating field, other surfaces or spaces can be illuminated, such as the oral cavity in dental technology, desks for shadow-free lighting, buildings or parts of buildings in architecture, or assembly surfaces in precision assembly, for example.

[0010] According to a first aspect, a lighting device for illuminating a surface, in particular a surgical field, is proposed. The lighting device has a plurality of lighting segments. The lighting segments are arranged at least partially next to one another. Each lighting segment has a light source, a lens, and an at least partial shield. The light source of each lighting segment is arranged and configured to emit light. The light source of each lighting segment represents the beginning of a beam path. The lens of each lighting segment is arranged and configured to at least partially receive and emit the emitted light. The at least partial shield of each lighting segment is arranged and configured to at least partially shield the lens from light, in particular directly emitted light, from neighboring light sources and / or from ambient stray light.

[0011] At least one group or each of the plurality of illumination segments is arranged and configured to project at least one luminous field onto at least one region of a surface to be illuminated, in particular a surgical field to be illuminated. The at least one luminous field represents one end of the beam path.

[0012] At least one group, for example the at least one group, or each individual one of the plurality of illumination segments is arranged and designed to move the at least one illuminated field along the surface, in particular along the surgical field. Additionally or alternatively, at least one group, for example the at least one group, or each individual one of the plurality of illumination segments is arranged and designed to enlarge or reduce the at least one illuminated field, for example to enlarge or reduce the surface, in particular in the surgical field. Additionally or alternatively, at least one group, for example the at least one group, or each individual one of the plurality of illumination segments is arranged and designed to change a luminous contour and / or a light color of the at least one luminous field.

[0013] This has the advantage that the light field can be flexibly adjusted. For example, the light field can be flexibly adapted to changing conditions surrounding the surface, especially the surgical field itself.

[0014] The at least partial shielding can be designed as a shield that is arranged and designed to completely shield the lens from, in particular, directly emitted light from the adjacent light sources and / or stray light from the environment. The at least partial shielding of each illumination segment can be designed as a scattering, in particular translucent (white), shield. The scattering, in particular translucent (white), shield can prevent / reduce stray light from the environment and / or prevent / reduce disruptive effects from adjacent light sources. The at least partial shielding can be movable or designed to be movable in any direction, for example in a direction along the beam path (parallel to the beam path) and / or transverse to the beam path.

[0015] If the at least one light field from each group of the plurality of illumination segments is projected / projected onto a region of a surface, in particular a surgical field, the enlargement or reduction of the at least one light field can serve to reduce the light field of a group of illumination segments and / or to enlarge the light field of another group.

[0016] For example, one group of lighting segments can project a light field onto an area, while the remaining ones of the plurality of lighting segments illuminate the periphery of the area. For example, the plurality of lighting segments can be divided into at least two groups, in each of which a subgroup of lighting segments can independently project a light field onto the surface. Furthermore, a subgroup of lighting segments can move the at least one light field along the surface, in particular along the surgical field. Additionally or alternatively, the subgroup can enlarge or reduce the at least one light field (along or on the surface, in particular along or on the surgical field). Furthermore, the subgroup of lighting segments can change a light contour of the at least one light field.

[0017] The lenses of the plurality of illumination segments can be interconnected. For example, the plurality of lenses can be configured as a matrix lens. The matrix lens can comprise the plurality of lenses that can be connected to one another in a force-fitting and / or form-fitting manner.

[0018] The lens can be arranged along the beam path between the light source and the surface to be illuminated, in particular the surgical field. The lens can be arranged and designed to be movable, in particular displaceable, along the beam path and / or transversely to the beam path, in particular mechanically or electromechanically. A direction transverse to the beam path can mean any movement within a plane running transversely, in particular perpendicularly, to the beam path. The lens can be arranged and designed to tilt relative to the light source. The lens can move the at least one illuminated field along the surface to be illuminated, in particular the surgical field. Additionally or alternatively, the lens can enlarge or reduce the at least one illuminated field.The lens, in particular a lens plane of the lens, can be arranged parallel to the light source, in particular a light-emitting surface of the light source. The lens can be arranged and configured such that it can be displaced parallel to the light source.

[0019] Each of the plurality of illumination segments can have a segment controller. Each of the plurality of illumination segments, in particular the segment controller of each of the illumination segments, can be arranged and configured to receive a control signal. Each of the plurality of illumination segments, in particular the segment controller of each of the illumination segments, can be arranged and configured to displace / incline the lens, in particular according to the control signal, along the beam path and / or transversely to the beam path, in particular electromechanically. A direction transverse to the beam path can mean any movement within a plane extending transversely, in particular perpendicularly, to the beam path.Each of the plurality of lighting segments, in particular the segment controller of each of the lighting segments, can be arranged and configured to receive a control signal and / or to move and / or parallel-displace and / or tilt the lens, in particular according to the control signal. The control signal can contain information for controlling the plurality of lighting segments, in particular the lenses and / or the light sources. Additionally or alternatively, each of the plurality of lighting segments, in particular the segment controller of each of the lighting segments, can be arranged and configured to adjust / adapt the light source in terms of light intensity, light color, and / or color rendering.

[0020] Each of the plurality of illumination segments can further comprise a first, in particular transparent, structural film. The first structural film can be arranged in the beam path between the light source and the lens. The first structural film can be arranged and configured to receive the light emitted by the light source and distribute it evenly over the lens, in particular to homogenize it, or to mix / mix inhomogeneities of the light source. Additionally or alternatively, the first structural film can be arranged and configured to receive the light emitted by the light source and to expand it elliptically, squarely, or circularly, in particular in a circularly concentric manner. The structural film can comprise nanostructures and / or microstructures and / or macrostructures.The structural film can be formed as a plastic, in particular as a transparent plastic, as a film, in particular as a transparent film, or as silicone, in particular transparent silicone. The structural film can be arranged and configured such that it can be moved along the beam path and / or transversely to the beam path, in particular so that it can be displaced parallel to the beam path and / or tilted. The structural film can be formed as a plastic sheet a few mm thick, for example, approximately 3 mm thick, in particular as a plastic sheet a few mm thick (e.g., 3 mm), for example, a transparent sheet.

[0021] In general, structures whose geometric dimensions are in the range of the wavelength of light can be referred to as nanostructures. Structures whose geometric dimensions are outside the wavelength of light can be referred to as microstructures. Structures whose geometric dimensions are in the range of the geometric dimensions of, for example, the structural film can be referred to as macrostructures. The first structural film can be combined with the first lens. A surface of the first lens can be configured like the first structural film, in particular by volume scattering or surface structuring, so that a (separate) first structural film can be omitted.

[0022] This has the advantage that the light is evenly distributed within at least one light field, thus evenly illuminating the surface to be illuminated, especially the surgical field. Uniform light distribution within the light field can also be achieved by using light sources of different light colors.

[0023] The lighting device can further comprise a plurality of lighting fixtures, in particular a plurality of circuit boards. The plurality of lighting fixtures, in particular the plurality of circuit boards, can each be arranged and configured to accommodate and supply energy to one of the plurality of lighting segments. The plurality of lighting fixtures, in particular the plurality of circuit boards, can be integrally formed as a single lighting fixture, in particular as a circuit board, for example as multiple lighting fixtures on a common carrier.

[0024] This has the advantage that, in the event of a fault, individual lighting segments can be replaced with or without the lighting fixture. Furthermore, it creates a modular design that allows the lighting device to be expanded or reduced as required.

[0025] The plurality of lighting fixtures, in particular the plurality of printed circuit boards, can be arranged and configured to receive one or more control signals and / or to forward the control signal(s) to one of the plurality of lighting segments, in particular to one of the plurality of segment controllers. The plurality of lighting fixtures, in particular the plurality of printed circuit boards, can be arranged and configured to be directly electrically connectable or connected to one another.

[0026] The lighting device can further comprise a lens plate. The lens plate can be arranged in the beam path between the plurality of lighting segments and the surface, in particular the surgical field. The lens plate can be arranged and configured to evenly distribute the light emitted by the at least one group of lighting segments or by each individual one of the plurality of lighting segments over at least one region of the surface, in particular the surgical field, in particular to homogenize or concentrate it within the illuminated field. The lens plate can be configured with Fresnel structures on the rear and / or the front. The lens plate can be configured as a cover / cover plate. The lens plate can be designed in conjunction with a glass cover plate, in particular as laminated safety glass.

[0027] The lens plate can be made of plastic, in particular a transparent plastic, a film, in particular a transparent film, or silicone, in particular transparent silicone. One lens plate can be arranged and configured to move along the beam path, in particular mechanically or electromechanically. The lens plate can be arranged and configured to distribute the received light over the surgical field in a volume-scattering or structured manner.

[0028] This has the advantage that the light is evenly distributed within at least one light field and thus evenly illuminates the area of ​​the surface, in particular the surgical field.

[0029] The lighting device can further comprise a second, in particular transparent, structured film. The second structured film can be arranged in the beam path between the lens plate or the surface and the plurality of lighting segments. The second structured film can be arranged and designed to be movable, in particular displaceable, along the beam path and / or transversely to the beam path. The second structured film can be arranged and designed to evenly distribute, in particular homogenize, the light emitted by the at least one group and / or by each individual one of the plurality of lighting segments over the lens plate or the surface, in particular the surgical field. The second structured film can be arranged and designed to change the contour of the at least one illuminated field.The second structural film can be formed as a plastic, in particular as a transparent plastic, as a film, in particular as a transparent film, or as silicone, in particular transparent silicone. The second structural film can have nanostructures and / or microstructures and / or macrostructures. The second structural film can be assigned to one or more or all of the plurality of lenses. The illumination device can further comprise a glass cover plate. The glass cover plate can be arranged in the beam path between the second structural film and the surface or between the plurality of illumination segments and the surface.

[0030] The second structural film can be arranged in the beam path between the lens plate and the surface.

[0031] The second structural film can be combined with, in particular bonded to, the glass cover. A surface of the glass cover can be designed like the second structural film, in particular by volume scattering or surface structuring, so that the second (separate) structural film can be omitted.

[0032] The second structural foil can be designed as a replaceable structural foil. The second structural foil can be arranged in the beam path so that it can be replaced.

[0033] This allows the light field to be adapted to changing ambient conditions, for example by replacing the second structural film with one scattering property with another second structural film with a different scattering property.

[0034] Each of the plurality of lighting fixtures can have a lighting fixture contour in the form of a circle, a circular ring segment, an ellipse, or a polygon, in particular a hexagon. The lighting device can further be configured to be held by an operator in at least one position. The lighting fixtures of the plurality of lighting fixtures can differ from one another in their lighting fixture contour. The plurality of lighting fixtures can have multiple lighting fixtures of the same contour and / or one or more different contours.

[0035] The light source can be designed as a light-emitting variant. The light source can be designed as a light-emitting diode (LED). The light source can be designed as a chip-on-board LED and / or as a chip-scale package LED. The light source can be designed as a plurality of LEDs, in particular as a cluster of LEDs, or can have a plurality of LEDs, in particular a cluster of LEDs. At least one of the plurality of lenses can be designed as a lens according to a third aspect, which is described further below. At least one of the plurality of lenses can be designed as a multifocal or bifocal lens, in particular a (partially) diffractive and / or (partially) refractive lens.

[0036] Each of the plurality of lenses and / or the lens plate can be designed as a Fresnel lens or comprise a Fresnel lens. If the plurality of lenses is designed as a matrix lens, each of the plurality of lenses comprising the matrix lens can be designed as a Fresnel lens or comprise a Fresnel lens. Each of the plurality of lenses can be pre-adapted in its reception and beam characteristics to a position in the illumination device relative to the surgical field. Thus, each of the plurality of lenses, in a corresponding position in the illumination device, can have the pre-determined reception and beam characteristics relative to the surface to be illuminated, in particular to the surgical field.

[0037] This has the advantage of a size-optimized lighting device while providing uniform illumination of a surface, especially an operating field.

[0038] The light source can be configured as at least two light sources with different, identical, or overlapping light emission wavelength ranges, or can comprise at least two light sources with different, identical, or overlapping light emission wavelength ranges. The light source can be configured as an LED. Each of the at least two light sources can be configured as an LED. Each of the plurality of light sources can be configured to emit in light emission wavelength ranges.

[0039] Each lighting segment can further comprise a mixing unit, in particular an optical one. The mixing unit can be arranged in the beam path between the at least two light sources and the lens. The mixing unit can be arranged and configured to receive the light emitted by the at least two light sources, which differ in light emission wavelength ranges or overlap in light emission wavelength ranges, to mix it, and to emit the mixed light to the lens. The mixing unit can have a square, rectangular, or circular cross-section on the light source side and / or a square, rectangular, or circular cross-section on the lens side. Each lighting segment can further comprise an optic, in particular a bundle optic. The optic can be arranged in the beam path between the mixing unit and the lens or between the light source and the lens.The bundled optics can be arranged and configured to receive the light emitted by the mixing unit or the light source, bundle it, and deliver the bundled light to the lens. The optics can have a square, rectangular, or circular cross-section on the light source or mixing unit side and / or a square, rectangular, or circular cross-section on the lens side.

[0040] The mixing unit and / or the bundle optics can comprise light-refracting and / or light-reflecting material or be formed by / as light-refracting and / or light-reflecting material. The mixing unit and the bundle optics can be connected to each other in a form-fitting and / or force-fitting manner.

[0041] The plurality of lighting fixtures may collectively have a rectilinear, in particular flat, shape. The plurality of lighting fixtures may collectively have a curved, in particular parabolic, shape, with a focal point on the surface, in particular on the surgical field, and / or a region of the surface, in particular the surgical field.

[0042] The lighting device may further comprise an operating element. The operating element may be configured to await incoming commands from an operator and to transmit the received commands as a control signal. The lighting device may further comprise an evaluation and control unit. The evaluation and control unit may be configured to receive the control signal and to transmit a control signal to the plurality of lighting segments (via the plurality of lighting fixtures), in particular to the segment controller, in particular via the plurality of lighting fixtures.The evaluation and control unit can be configured to send the control signal to the plurality of lighting segments (via the plurality of lighting fixtures), in particular to the segment controller, in order to direct and / or enlarge and / or reduce the at least one light field, to adjust / adapt the at least one light field contour and / or the light intensity, light color and / or color rendering, and / or to switch the at least one group and / or individual light sources of the plurality on or off. The evaluation and control unit can be arranged on one side of the lighting fixture. The evaluation and control unit can be integrated into a lighting fixture. The lighting device can further comprise a camera.The camera can be configured to photograph the surface, in particular the surgical field, at time intervals and / or to film the surface, in particular the surgical field, and to send image and / or film data to the evaluation and control unit. The evaluation and control unit can further be configured to receive and evaluate the image and / or film data and to send specially generated control signals to the plurality of illumination segments, in particular to the segment controller, in order to direct and / or enlarge or reduce the at least one illuminated field, to adjust / adapt the at least one illuminated field contour and / or the light intensity, light color and / or color reproduction and / or to switch the at least one group and / or individual ones of the plurality of light sources on or off. The evaluation and control unit can further be configured to send the image and / or film data to the control element.

[0043] The evaluation and control unit can be configured and designed to instruct the plurality of illumination segments to compensate for shadows on the surgical field on the basis of evaluated image and / or film data.

[0044] The control element can be configured and designed to receive data and / or signals, in particular image and / or film data, and to display image and / or film data on the control panel.

[0045] The plurality of lighting fixtures may further be configured to accommodate a camera, to transmit data and / or signals, in particular film and / or image data, to the camera, or to receive data from the camera and to send them to the evaluation and control unit.

[0046] According to a second aspect, a method is provided for, for example, adaptive illumination and / or illumination control of a surface to be illuminated, in particular a surgical field. The method can comprise providing a plurality of illumination segments. The illumination segments can be arranged at least partially next to one another. Each illumination segment has a light source, a lens, and an at least partial shield. The light source is arranged and configured to emit light. The light source represents a start of a beam path. The lens is arranged and configured to at least partially receive and emit the emitted light. The at least partial shield is arranged and configured to at least partially shield / scatter / break up the lens from emitted light from adjacent light sources.The method comprises projecting at least one luminous field onto a region of a surface to be illuminated, in particular a surgical field. The method comprises moving the at least one luminous field along the surface, in particular the surgical field. Additionally or alternatively, the method comprises enlarging or reducing the size of the at least one luminous field. Additionally or alternatively, the method comprises changing a luminous contour of the at least one luminous field.

[0047] The method may include moving at least one group or each of the plurality of lenses.

[0048] According to a third aspect, a lens, in particular a Fresnelized lens, is proposed, in particular a lens for a lighting device. The lighting device can be or comprise the lighting apparatus according to the first aspect. The lens can be suitable for being received by a lighting device. The lens is configured to receive and emit light (from a light source). The lens has a first side and a second side. The first side has first side structures. The second side structures are (have been) calculated or adapted for or to a first light source-lens distance. The second side structures are (have been) calculated or adapted for or to a second light source-lens distance.In other words, the first and second side structures are calculated or adapted for or to a first and a second light source-lens distance. A light source-lens distance range results from the first and second side structures. Within the light source-lens distance range, the light source can assume any, in particular any, light source distance. If the light source assumes any, in particular any, light source distance within the light source-lens distance range, a uniform illuminance distribution along a surface to be illuminated results when light from the light source is projected onto the surface to be illuminated by means of the lens.

[0049] Within the light source-lens distance range, a plurality of, in particular discrete, light source-lens distances can result, at which a light source can assume a light source distance. If the light source assumes one of the, in particular discrete, light source distances, a uniform illuminance distribution results along a surface to be illuminated when light from the light source is projected onto the surface to be illuminated by means of the lens.

[0050] The lens according to the third aspect can be used for focusing. The lens according to the third aspect can have a multifocal property.

[0051] The light source-lens distance of the two distances or positions may be determined perpendicular to a lens plane of the lens and / or arranged on an optical axis of the lens.

[0052] The lens may further comprise an optical axis. The lens, particularly in conjunction with the light source, may cause an illuminance on an illuminated surface. The illuminance may reach a maximum value at the intersection point between the illuminated surface and the optical axis. Away from this intersection point and along the illuminated surface, the illuminance may decrease, particularly monotonically.

[0053] The lens, particularly in conjunction with the light source, can cause / result in a normally distributed illuminance along the illuminated surface when the light source projects light onto the surface to be illuminated via the lens. The illuminance distribution can be centered at the intersection of the optical axis and the illuminated surface.

[0054] The first and second side structures can be calculated as a function of one another and / or for a first and a second light source-lens distance, in particular on the optical axis.

[0055] The first and second side structures may each have side structure sizes outside the wavelength range of a light of a light source arranged at a distance from the lens.

[0056] The lens can be designed as a stable, particularly dimensionally stable, lens. The lens can be designed as a freeform lens, particularly a multifocal or bifocal lens. At least one side of the lens can be designed as freeform surfaces. Both sides of the lens can be designed as freeform surfaces.

[0057] According to a fourth aspect, a lighting or exposure device with a lens according to the third aspect is proposed. Although some of the aspects described above have been described with reference to the lighting device according to the first aspect, these aspects can also be implemented in a corresponding manner according to the method according to the second aspect, the lens according to the third aspect, and / or the lighting or exposure arrangement according to the fourth aspect, and vice versa.

[0058] Further features, characteristics, advantages and possible modifications will become clear to a person skilled in the art from the following descriptions, which refer to the accompanying drawings.

[0059] Fig.l shows schematically an example of a lighting device for illuminating a surface.

[0060] Fig.2 shows schematically an example of a lighting segment of a lighting device.

[0061] Fig.3 shows schematically an example of a lighting device for illuminating a surface.

[0062] Fig.3a shows schematically an example of a lighting device for illuminating a surface.

[0063] Fig.3b shows schematically an example of a lighting device for illuminating a surface, wherein the lighting device has a parabolic shape.

[0064] Fig.4 shows schematically an example of a lighting segment of a lighting device.

[0065] Fig.5 shows schematically an arrangement example of several lighting segments for a lighting device.

[0066] Fig.6 shows schematically an arrangement example of several lighting segments for a lighting device.

[0067] Fig.7 shows schematically an arrangement example of several lighting segments for a lighting device.

[0068] Fig.7a shows schematically an arrangement example of several lighting segments for a lighting device.

[0069] Fig.8 shows schematically the ray path of a conventional aspheric lens for different positions of a light source.

[0070] Fig. 9 schematically shows the ray path of a coupled freeform lens. Fig. 10 schematically shows the ray path of a Fresnelized coupled freeform lens.

[0071] Specific details are set forth below, but are not limited thereto, in order to provide a thorough understanding. However, it will be apparent to one skilled in the art that the details set forth below may be used in other embodiments that may differ from the details set forth below. Furthermore, the figures are for illustrative purposes only. They are not to scale and are intended only to reflect the general concept by way of example. For example, features included in the figures should by no means be considered necessary components.

[0072] Even though an operating field is usually used below as an example of a surface to be illuminated, the surface is not restricted to this specific example. Other surfaces can also be illuminated, even if they are not explicitly mentioned below. Examples of surfaces include the oral cavity in dental technology, parts of buildings or entire buildings in architectural lighting, or surfaces for precision assembly. The lighting device can therefore be designed or used for various applications. Purely by way of example, in addition to the design as an operating room light, the design as a general light, as a veterinary light, as a dentist's light, or as an architectural light. Even though several examples are described separately below, they can be flexibly combined with one another, as indicated by the uniform reference symbols.Thus, elements designated with the same reference numerals in separate examples can be considered to correspond to one another and can be interchanged or replaced with one another. Consequently, the separately described embodiments can be combined with one another.

[0073] Fig. 1 shows an example of a lighting device 1 for illuminating a surface to be illuminated. Purely by way of example and without being limited thereto, a surgical field OF is assumed below as the surface to be illuminated. The lighting device 1 has a plurality of lighting segments 10, each with a lens 14 and a light source 12 (not shown). The plurality of lighting segments 10 are each electrically connected to one of a plurality of lighting elements 30, so that energy and / or control signals can reach the lighting segments 10. An evaluation and control unit 60 is arranged on the plurality of lighting elements 30 and is designed to receive and forward a control signal SB from an operating element 90.

[0074] For example, an operator can input the control element 90 to project a light field 20 onto an area of ​​a surgical field OF. The light field 20 is then projected onto an area of ​​the surgical field OF, whereupon the area is illuminated. The operator can also input the desired contour 22 of the light field 20 into the control element 90, here a circular contour 22.

[0075] If it is desired that a different area of ​​the surgical field OF be illuminated, the operator can enter this on the control element 90. The control element 90 then sends a control signal SB to the evaluation and control unit 60. The evaluation and control unit 60 then sends a control signal SL (not shown) to the participating lighting segments 10 via the plurality of lighting elements 30. The lighting elements 30 are electrically connected to one another, so that the control signal can be forwarded via the lighting elements 30 to the corresponding lighting segments 10.

[0076] If the corresponding illumination segments 10 receive the control signal SL (not shown), the lenses 14 of the illumination segments 10 are moved relative to the corresponding light source such that the illuminated field 20 is moved along one surface of the surgical field OF and illuminates a different area 26 of the surface of the surgical field OF. The operator can adjust the contour of the illuminated field 20 using the control element, resulting in a new elliptical illuminated field contour 24.

[0077] The lighting device 1 can have a camera 70, which is arranged next to the plurality of lighting segments 10 and films the surgical field OF. The film data is sent from the camera 70 via the lighting elements 30 to the evaluation and control unit 60. This can evaluate the film data and / or send the film data to the control element 90, which then displays the film data.

[0078] The operator can view the displayed film data of the surgical field OF and enter on the control element 90 which area of ​​the surface of the surgical field OF should be illuminated and how. The operator can select whether to steer the illuminated field 20 and / or enlarge or reduce its size or divide it into multiple groups, what shape the illuminated field contour 20 should take, and / or whether to adjust the light intensity, light color, and / or color rendering.

[0079] Fig. 2 shows an example of a lighting segment 10. The lighting segment 10 has a light source 12, a shield 16, and a lens 14. The light source 12 generates light and, in the example shown, is designed as an LED. Starting from the light source 12, the light rays LS spread to the lens 14. The shield 16 prevents light from neighboring light sources of the neighboring lighting segments 10 from directly entering the lens 14. In the example shown, the lens 14 is arranged along two axes L x , L y displaceable or movable. The shield 16 is designed to be flexible so that the shield 16 can be moved along the axis of movement L x , L ythe lens 14 yields or moves with it. The movement of the lens 14 can be achieved via electromechanical motors. A portion of the shield can be seen to the side of the lens 14. At one point, the portion of the shield 16 can be connected to the lens 14. This portion of the shield can also be flexible, so that it yields or moves with the movement of the lens 14.

[0080] The illumination segment 10 further comprises a first transparent structural film 17, which receives the light from the light source 12 and distributes the received light to the lens 14. In other words, the light rays LS are evenly distributed along the inner side of the lens 14.

[0081] Furthermore, the lighting segment 10 has a segment controller 18 that can receive a control signal SL. The lens 14 and the light source 12 are configured and designed to receive a signal from the segment controller 18. The control signal SL can contain information indicating how the lens 14 must be directed or which light intensities, light color, and / or color rendering the light source 12 must set.

[0082] Fig. 3 shows an example of a lighting device 1 for illuminating a surgical field OF. In the example shown, the lighting device 1 has a plurality of lighting bodies 30 that are connected to one another and each house and supply power to a lighting segment 10. In the example shown, the lighting device 1 is switched on or off via an operating element 90 (not shown). In addition, the lighting device 1 has a lens plate 40 that is arranged between the surgical field OF and the plurality of lighting segments 10. In the variant shown, at least one group of lighting segments 10 is mechanically movable, in particular displaceable, relative to the corresponding light sources, for example by the hand movement of an operator who displaces the at least one group of lighting segments.In other words, a significant change in the luminous field 20 occurs when the lenses of at least one group of lenses are moved relative to the light sources that the lighting fixture houses and supplies with power. This is especially true when the lenses are moved along an xy plane (with reference to the nomenclature in Figure 2, more precisely an xz plane, where L. z Although not shown, the third direction of a Cartesian coordinate system with L x and L yforms) can be moved transversely to the beam path. The xz-plane can be any plane transverse, in particular perpendicular, to the beam path. This allows the illuminated field 20 to be moved along the surgical field OF and, for example, reduced in size. In the example shown, the illuminated field 20 moves to another area 26 of the surface of the surgical field OF. In addition, the illuminated field contour 22 is changed from a circular contour to an elliptical illuminated field contour. In the variant shown, the lens plate 40 is designed as a glass cover plate, thus ensuring a protective and bundling effect.

[0083] Fig. 3a shows an example of a lighting device 1 for illuminating a surgical field OF. In the example shown, the plurality of lighting bodies 30 are integrally formed as a printed circuit board. The printed circuit board 30 accommodates a plurality of lighting segments arranged side by side and each having a light source 12. Each light source 12 is connected to the integrally formed lighting body 30. The light sources 12 are separated from one another by a shield 16, which prevents one lens 14 of the respective lighting segment 10 from directly receiving light from the adjacent light sources and the surroundings. In the example shown, the shield 16 is made of light-absorbing material. Furthermore, the plurality of lenses 14 are designed as a matrix lens. The respective shield 16 is connected to the matrix lens 14 of the printed circuit board 30 and the printed circuit board 30.In the example shown, the shield 16 is constructed in two parts, wherein the two parts of a respective shield 16 can be telescoped into and pulled apart when the matrix lens 14 is moved relative to or away from the light sources 12 / the circuit board 30. One part of the shield 16 is connected to the matrix lens 14 and is accordingly designed to be movable or movable in any direction, in particular parallel to or transverse to (e.g., perpendicular to) the beam path. Another part of the shield 16 is connected to the circuit board 30 and is designed to be movable or movable in any direction, in particular parallel to or transverse to (e.g., perpendicular to) the beam path.

[0084] The lighting device 1 further comprises a lens plate 40. The plurality of lenses of the matrix lens 14 and the lens plate 40 are each designed as a Fresnel lens. The matrix lens 14 is mechanically movable, in particular displaceable, transversely to the light sources 12 and toward or away from them. As a result, the matrix lens 14 is mechanically movable, in particular displaceable, relative to the light sources 12. This allows the illuminated field 20 to be moved to another area. The other area of ​​the surface is thus illuminated with / by the illuminated field 26. The illuminated field contour 24 was changed by a relative movement of the matrix lens 14 to the light sources 12.

[0085] In addition, the lighting device 1 in the example shown has a first structured film 17 and a second structured film 50. The first structured film 17 serves to evenly distribute the light rays onto one of the plurality of lenses of the matrix lens 14 in the corresponding lighting segment 10. The second structured film 50 serves to homogenize the light rays onto the lens plate(s) 40. This ensures that the illuminated field 26 has a uniform light beam distribution. In other words, the second structured film 50 ensures that the light intensity is uniform along the illuminated field 26.

[0086] Fig. 3b shows an example of a lighting device 1. The illustrated lighting device 1 has a plurality of lighting segments 10. The lighting segments 10 are accommodated by a parabolic lighting body 30, which supplies the lighting segments 10 with power. Therefore, in this example, the lighting device can be referred to as a parabolic lighting device 1. The parabolic lighting device 1 is arranged at a distance from the surface OF, such that the focal point of the parabolic lighting device 1 lies on a region of the surface OF. The lighting device 1 projects a light field 20 with a light field contour 22 onto a region of the surface OF. The plurality of lenses 14 (not referenced in the figure) are designed and constructed to move relative to their associated light source.This allows the light field 20 to be moved along the surface OF, and the light field contour to be adjusted. In other words, the lighting fixtures accommodate the lighting segments. In the example shown, the light sources and the shield are directly connected to the light fixture. The numerous lenses can be moved relative to the corresponding light sources. The shield adapts to the movement accordingly. This allows the light field to be moved along the surface.

[0087] Fig. 4 shows an example of a lighting segment 10. The lighting segment 10 has two light sources 11 and 13, a shield 16, and a lens 14. The light sources 11 and 13 generate light in multiple wavelengths and, in the example shown, are each designed as an LED. In other words, the light sources 11 and 13 generate light in different wavelength ranges. Starting from the light sources 11, 13, the light beams LS propagate to the lens 14. The shield 16 prevents light from neighboring light sources of neighboring lighting segments 10 from directly entering the lens 14. In the example shown, the lens 14 is arranged along two axes L x , L y displaceable or movable. The shield 16 is designed to be flexible so that the shield 16 can be moved along the axis of movement L x , L ythe lens 14 yields or moves. The movement of the lens 14 can be achieved via electromechanical motors, e.g., piezo motors.

[0088] The illumination segment 10 further comprises a mixing unit 15 arranged on the two light sources 11 and 13. In the example shown, the mixing unit 15 has a square cross-section QQ on the light source side A'. The mixing unit 15 receives the light emitted by the light sources 11 and 13, mixes the light from the two light sources 11, 13, and transmits the mixed light to a bundle optics 19. The bundle optics 19 is arranged between the mixing unit and the lens 14. The bundle optics 19 is in direct contact with the mixing unit 15. The bundle optics 19 receives the mixed light emitted by the mixing unit 15 and transmits it to the lens 14. So that the lens 14 can be moved, in particular displaced, along and across (e.g., in an xz plane) to the beam path, the bundle optics is arranged at a distance from the shield 16 and the lens 14. The bundle optics 19 has a circular cross-section KQ on the lens side B'.

[0089] Furthermore, the lighting segment 10 has a segment controller 18 that can receive a control signal SL. The lens 14 and the two light sources 11 and 13 are configured and designed to receive a control signal SL from the segment controller 18. The control signal SL contains information indicating the direction in which the lens 14 should or must be directed, or the light intensity, light color, and / or color rendering the light from the light sources should assume. Figure 5 shows an arrangement example of the lighting segments 10 for a lighting device 1, in particular for a lighting device 1 described herein. The example shown shows one possible arrangement of the plurality of lighting segments 10. The view of the plurality of lenses 14 can be seen.Not visible, as they are located behind the lighting segments 10, are the multitude of lighting bodies 30 that accommodate a multitude of lighting segments 10. In the variant shown, all lenses 14 are moved as a whole by an operator across or along the beam path. The individual lenses have different light emission properties depending on their position in the illustrated arrangement. For example, the outer lenses at the edge of the arrangement example are designed such that the light emitted by these lenses radiates towards the center of the arrangement when the arrangement is in a neutral position (perpendicular and parallel alignment of the lenses with respect to the light sources). The lenses 14 in the second row from the edge of the arrangement example also radiate towards the center of the arrangement.Since the lenses in the array are positioned closer to the center of the array than those in the outermost row, the lenses in the second row do not have to radiate as strongly towards the center of the array.

[0090] Figure 6 shows an example arrangement of the lighting segments 10 for a lighting device 1, in particular for a lighting device 1 described herein. The example shown shows one possible arrangement of the plurality of lighting segments 10. The view of the plurality of lenses 14 can be seen. Not visible, as they are located behind the lighting segments 10, are the plurality of lighting bodies 30 that house the plurality of lighting segments 10. In the center of the arrangement, one lighting segment 10 has been replaced by a camera 70, which films the surgical field or photographs it at regular intervals. In the variant shown, all lenses 14 are moved as a whole by an operator across or along the beam path. Alternatively, a handle in which a camera is integrated can be arranged instead of the camera 70.

[0091] Fig. 7 shows an example arrangement of the lighting segments 10 for a lighting device 1, in particular for a lighting device 1 described herein. The example shown shows one possible arrangement of the plurality of lighting segments 10. The view of the plurality of lenses 14 can be seen. Not visible, as they are located behind the lighting segments 10, are the plurality of lighting bodies 30 that accommodate the plurality of lighting segments 10. In the center of the arrangement, one lighting segment 10 has been replaced by a camera 70, which films the surgical field OF or photographs it at regular intervals. A directly adjacent lighting segment 10 has been replaced by a handle 80. The handle 80 serves as a movement element for the operator to pivot the lighting device.In addition, various settings regarding light color and color rendering can also be adjusted on the handle.

[0092] Fig. 7a shows an example arrangement of the illumination segments 10 for a lighting device 1, in particular for a lighting device 1 described herein. The example shown shows one possible arrangement of the plurality of illumination segments 10. The view of the plurality of lenses 14 is visible. Not visible, as they are located behind the illumination segments 10, are the plurality of illumination bodies 30 that accommodate the plurality of illumination segments 10. In the center of the arrangement, a circular illumination segment 10 has been replaced by a camera 70, which films the surgical field OF or photographs it at regular intervals. The illumination segments 10 have a contour in the form of a circular ring segment.

[0093] Fig. 8 shows a schematic of the beam path SG of a conventional aspheric lens AL for different positions P of a light source LQ. The aspheric lens AL has a first side ALI and a second side AL2. Typically, a lens is calculated for a position P so that a homogeneous light distribution occurs. The prior art lens shown is designed for a distance PI. If the light source LQ is positioned in front of the first side of the lens ALI on the optical axis OA, a homogeneous light distribution occurs, which can be seen from the uniform distances between the rays in the beam path SG. BK denotes a visual separation between near and far field. If the distance of the light source PI along the optical axis is changed to / on, for example, distance P2 or P3, the beam path changes accordingly.Due to the adjustment / calculation of the lens for the distance PI, a homogeneous light distribution is not achieved for a changed position of the light source LQ, as can be seen from the changed beam paths in Figure 8 for the distances P2 to P5 of the light source. A corresponding lighting device having such a conventional lens would produce a light field that has a ring-shaped structure if the light source is positioned close to the lens. Fig. 9 shows a coupled freeform lens FFL. This lens has a first and a second side FFL1, FFL2. In contrast to the conventional lens from Figure 8, the coupled freeform lens FFL from Figure 8 has been calculated for two distances PI and P2 and manufactured accordingly. In other words, the coupled freeform lens FFL is assigned a distance range that is limited by a distance PI and a distance P2.In the distance range, if the light source LQ is arranged along the optical axis within the distance range, a homogeneous light distribution is generated. Figure 9 shows the beam paths for two distances P1 and P2. The freeform lens FFL described with reference to Figure 9 can be used, for example, as lens 14, in a lighting device 1 described herein.

[0094] Fig. 10 shows a Fresnelized coupled freeform lens FL. This lens FL has a first side FL1 and a second side FL2. In contrast to the conventional lens from Figure 8, the Fresnelized coupled freeform lens FL from Figure 8 has been calculated for two distances PI and P2 and manufactured accordingly. In other words, the Fresnelized coupled freeform lens FFL is assigned a distance range that is delimited by a distance PI and a distance P2. In the distance range, if the light source LQ is arranged within the distance range along the optical axis, a homogeneous light distribution is generated. Figure 10 shows the beam paths for two distances PI and P2. The Fresnelized coupled freeform lens FL described with reference to Figure 10 can be used, for example, as lens 14, in a lighting device 1 described herein.

Claims

Claims 1. A lens adapted to receive and emit light, comprising: - a first page, comprising first page structures, and - a second side, comprising second side structures, wherein the first and the second side structures are calculated for a first and a second light source-lens distance, so that a light source-lens distance range results, within which a lens can assume any light source distance such that a uniform illuminance distribution results along a surface to be illuminated when a light from the light source is projected onto the surface to be illuminated by means of the lens.

2. Lens according to claim 1, further comprising an optical axis, wherein an illuminance on an illuminated surface assumes a maximum value at the intersection point between the illuminated surface and the optical axis and away from this intersection point and along the illuminated surface the illuminance decreases, in particular monotonically.

3. Lens according to claim 1 or 2, further comprising an optical axis, wherein a normally distributed illuminance results along the illuminated surface when the light source projects a light onto the surface to be illuminated by means of the lens, the illuminance distribution being centered at the intersection point of the optical axis and the illuminated surface.

4. A lens according to any one of claims 1 to 3, further comprising an optical axis, wherein the first and second side structures are or were calculated in dependence on one another.

5. A lens according to any one of claims 1 to 4, wherein the first and second side structures are or were calculated for a first and a second light source-lens distance on the optical axis.

6. A lens according to any one of claims 1 to 5, wherein the first and second side structures each have side structure sizes outside a wavelength range of the light from the light source.

7. Lighting or exposure device for illuminating surfaces, comprising a lens according to one of claims 1 to 6.

8. Lighting device (1) for illuminating a surface, in particular an operating field (OF), comprising a plurality of lighting segments (10) which are arranged at least partially next to one another, each lighting segment (10) comprising: - a light source (12) arranged and designed to emit light, the light source representing a beginning of a beam path, - a lens (14) arranged and designed to at least partially receive and emit the emitted light, and - an at least partial shield (16) which is arranged and designed to at least partially shield the lens (14) from light, in particular directly emitted light, from adjacent light sources and / or stray light from the environment, wherein at least one group or each individual one of the plurality of illumination segments (10) is arranged and designed to project at least one luminous field (20) onto at least one region of the surface, in particular of the surgical field (OF), wherein the at least one luminous field (20) represents one end of the beam path, and further to move the at least one luminous field (20) along the surface, in particular of the surgical field (OF), and / or to enlarge or reduce the at least one luminous field (20), and / or to change a luminous contour (22) and / or a light color of the at least one luminous field (20).

9. Lighting device (1) according to claim 8, wherein the lens (14) is arranged and designed along the beam path (LS) between the light source (12) and the surface, in particular the operating field (OF), such that along (L y ) of the beam path (LS) and / or across (L x ) to the beam path (LS), in particular mechanically or electromechanically, movable, in particular displaceable, to move and / or enlarge or reduce the at least one light field (20) along the surface, in particular the operating field (OF).

10. Lighting device (1) according to claim 8 or 9, wherein each of the plurality of lighting segments (10) has a segment control (18), wherein each of the plurality of lighting segments (10), in particular the segment control (18), is arranged and designed to receive a control signal (SL) and to move the lens (14), in particular according to the control signal (SL), along the beam path (L x ) and / or transverse to the beam path (L y ), in particular electromechanically, and / or to adjust or adapt the light source (12) in a light intensity, in a light colour and / or in a colour rendering.

11. Lighting device (1) according to one of claims 8 to 10, wherein each of the plurality of lighting segments (10) further comprises: - a first, in particular transparent, structural film (17) which is arranged in the beam path (LS) between the light source (12) and the lens (14), wherein the first, in particular transparent, structural film (17) is arranged and designed to be movable along the beam path and / or transversely to the beam path, to receive the light emitted by the light source (12) and to distribute it evenly onto the lens (14), in particular to homogenize it.

12. Lighting device (1) according to one of claims 8 to 11, further comprising: a plurality of lighting bodies (30), in particular a plurality of printed circuit boards, each of which is arranged and designed to accommodate and supply energy to one of the plurality of lighting segments (10) and / or to receive the control signal (SL) and / or to forward the control signal (SL) to one of the plurality of lighting segments (10), in particular to one of the plurality of segment controllers (18).

13. Lighting device (1) according to one of claims 8 to 12, further comprising: a lens plate (40) which is arranged in the beam path between the plurality of lighting segments (10) and the surface, in particular the operating onsfeld (OF), wherein the lens plate (40) is arranged and designed such that the light emitted by the at least one group or by each individual one of the plurality of illumination segments (10) is distributed uniformly over the at least one region of the surface, in particular of the operating field (OF), in particular to homogenize it, or to concentrate it.

14. Lighting device (1) according to one of claims 8 to 13, further comprising: - a second, in particular transparent, structural film (50) which is arranged in the beam path between the lens plate (40) and the plurality of illumination segments (10), wherein the second, in particular transparent, structural film is arranged and designed to distribute the light emitted by the at least one group or by each individual one of the plurality of illumination segments (10) evenly on the lens plate (40), in particular to homogenize it, and / or to change the contour (22, 24) of the at least one luminous field (20, 26).

15. Lighting device (1) according to one of claims 8 to 14, wherein the second structural film is designed as a replaceable structural film.

16. Lighting device (1) according to one of claims 8 to 15, wherein each of the plurality of lighting bodies (30) has a lighting body contour in the form of a circle, a circular ring segment, an ellipse or a polygon, in particular a hexagon, and / or the lighting device (1) is further designed to be held in at least one position by an operator.

17. Lighting device (1) according to one of claims 8 to 16, wherein the light source (12) is designed as a light-emitting diode, LED, in particular as a chip-on-board LED or as a chip-scale package LED.

18. Lighting device (1) according to one of claims 8 to 17, wherein at least one of the plurality of lenses (14) or the lenses in the plurality of lighting segments (10) is / are designed as a lens according to one of claims 1 to 6.

19. Lighting device (1) according to one of claims 8 to 18, wherein each of the plurality of lenses (14) and / or the lens plate (40) is designed as a Fresnel lens.

20. Lighting device (1) according to one of claims 8 to 19, wherein the light source (12) is designed as: - at least two light sources (11, 13) of different or identical or overlapping light emission wavelength ranges, and / or - an LED variant; or at least a subset of the plurality of light sources is arranged and configured to emit in different or overlapping light emission wavelength ranges.

21. Lighting device (1) according to one of claims 8 to 20, wherein each lighting segment (10) further comprises: - a mixing unit (15), in particular an optical one, which is arranged in the beam path between at least two light sources (11, 13) and the lens (14), wherein the mixing unit (15) is arranged and designed to receive the light emitted by the at least two light sources (11, 13) and which differs or overlaps in light emission wavelength ranges, to mix it and to emit the mixed light to the lens (14), wherein the mixing unit (15) has a square, rectangular or circular cross-section (QQ ) on the light source side (A') and / or a square, rectangular or circular cross-section on the lens side.

22. Lighting device (1) according to one of claims 8 to 21, wherein each lighting segment (10) further comprises: - an optical system (10), in particular a bundled optical system (19), which is arranged in the beam path between a mixing unit (15) and the lens (14) or between the light source (12) and the lens (14), wherein the optical system (19) is arranged and designed to receive the light emitted by the mixing unit (15) or by the light source (12), to bundle it and to emit the bundled light to the lens (14), wherein the optical system (19) has a square, rectangular or circular cross-section on the light source or mixing unit side and / or a square, rectangular or circular cross-section (KQ) on the lens side (B').

23. Lighting device (1) according to one of claims 8 to 22, wherein the mixing unit (15) and / or the bundle optics (19) comprise light-refracting and / or light-reflecting material.

24. Lighting device (1) according to one of claims 8 to 23, wherein a plurality of lighting bodies (30) as a whole have a rectilinear, in particular flat, shape, or a curved, in particular parabolic, or circular or stepped shape, with a focal point on the surface, in particular the operating field (OF), and / or a region of the surface, in particular the operating field.

25. Lighting device (1) according to one of claims 8 to 24, further comprising: - an operating element (90) which is designed to await incoming commands from an operator and to send the incoming commands as a control signal (SB), and / or - an evaluation and control unit (60) which is designed to receive the control signal (SB) and to send a control signal (SL) to the plurality of lighting segments (10), in particular to the segment controller (18), in particular via the plurality of lighting bodies (30), in order to direct and / or enlarge or reduce the at least one light field (20), to set / adapt the at least one light field contour (22) and / or a light intensity, a light color and / or a color rendering, and / or to switch the at least one group and / or individual ones of the plurality of light sources (12) on or off.

26. Lighting device (1) according to one of claims 8 to 25, further comprising: - a camera (70) which is designed to photograph the surface, in particular the surgical field (OF), at time intervals and / or to film the surface, in particular the surgical field (OF), and to send image and / or film data to the evaluation and control unit (60), wherein the evaluation and control unit (60) is further designed to receive the image / or film data, to evaluate them and to send specially generated control signals (SL) to the plurality of illumination segments (10), in particular to the segment control (18) to send the at least one light field (20) to direct and / or enlarge or reduce the size of the at least one luminous field contour (22) and / or the light intensity, the light color and / or the color rendering and / or to switch on or off the at least one group and / or individual ones of the plurality of light sources (12).

27. Method for illuminating and / or controlling the illumination of a surface, in particular an operating field (OF), comprising the steps: - Providing a plurality of lighting segments (10) which are arranged at least partially next to one another, each lighting segment (10) comprising: - a light source (12) arranged and designed to emit light, the light source (12) representing a start of a beam path, - a lens (14) arranged and designed to at least partially receive and emit the emitted light, and - an at least partial shield (16) arranged and designed to at least partially shield the lens (14) from emitted light from adjacent light sources; - Projecting at least one luminous field (20) onto a region of a surface, in particular an operating field (OF), wherein the at least one luminous field (20) represents one end of the beam path, the method further comprising: Moving the at least one light field (20) along the surface, in particular the operating field (OF), and / or Enlarging or reducing the at least one luminous field (20), and / or changing a luminous contour (22) of the at least one luminous field (20).

Images