DE102010005093A1 - Illumination device of e.g. operating microscope, has optical portion connected with light guard entry end in fixed strands, such that spatial relationship does not change by relative movement between light sources and guard entry end - Google Patents

Abstract

The device (27) has an optical portion (35) connected with entry end (33) of light guard (29) in fixed strands, such that the spatial relationship between optical portion and light guard does not change by the relative movement between light sources (31A,31B) and entry end of light guard. Two light sources and entry end of light guard are arranged relative to each other, so that the illuminating light from light sources is linked into the entry end of light guard.

Description

The present invention relates to a lighting device having a first light source for emitting illumination light and at least one second light source for emitting illumination light and having a light guide, which comprises an entrance end, in which the illumination light is coupled. In addition, the present invention relates to an optical observation device with such a lighting device.

In lighting devices of optical observation devices such as surgical microscopes or endoscopes, it is of great importance that a quick lamp replacement can take place when the lamp used previously fails. This is particularly important in the case of the aforementioned surgical microscopes and endoscopes, since a new lamp must be usable as quickly as possible in the event of a breakdown during an operation. There are therefore Lampwechsler use, which include a replacement lamp, which must be placed only in place of the original lamp, without the need for this, the lighting device needs to be opened. In addition, the illumination devices are often arranged remotely from the optical observation device, for example on the stand, in order to decouple the optical observation device from vibrations resulting from the cooling of the lamps as far as possible. The light of the lamps is then passed through optical fibers to the optical observation device. A surgical microscope with a lighting device in which the light of the lamp is coupled into an optical waveguide and which has a lamp changing device for rapid lamp replacement is, for example, in US Pat CN 2645097 Y described.

However, previous fiber-coupled light sources with lamp replacement have the disadvantage that small shifts on the fiber side or lamp side large light fluctuations at the fiber exit end, so the optical observation system, can result.

It is therefore an object of the present invention to provide a lighting device with a first light source for emitting illumination light and at least one second light source for emitting illumination light and with a light guide available, in which the sensitivity to small shifts on the light guide side or lamp side less large light fluctuations as in the prior art brings with it.

It is a further object of the present invention to provide an optical observation apparatus with a lighting device that allows the light source to be changed, with small shifts on the fiber side or lamp side resulting in less large light fluctuations than in the prior art.

The first object is achieved by a lighting device according to claim 1, the second object by an optical observation device according to claim 13. The dependent claims contain advantageous embodiments of the invention.

According to the invention, a lighting device is provided with a first light source for emitting illumination light and at least one second light source for emitting illumination light. In addition, the lighting device according to the invention comprises a light guide with an entrance end, in which the illumination light is coupled, and a coupling optics for coupling the illumination light in the inlet end of the light guide. The first light source, the second light source and the entrance end of the light guide are arranged movable relative to each other and positioned relative to each other, which can optionally be coupled to the illumination light of the first light source or the illumination light of the second light source in the inlet end of the light guide. The coupling optics is in a fixed spatial relationship with the entrance end of the light guide in such a way that this spatial relationship does not change due to a relative movement between the light sources and the entrance end of the light guide. In other words, the coupling optics is spatially fixedly assigned to the entry end in its position.

In the lighting device according to the invention, the effects of mispositioning of the light source with respect to the entrance end of the light guide are reduced as compared to prior art lighting devices in which the launching devices are in fixed spatial relationship with the light source and not with the entrance end of the light guide. The reason for this is that the optical axis of the coupling device continues to be in a fixed relationship with the optical axis of the incident end of the optical fiber, even in the case of mispositioning, and thus the focal point of the coupling device remains in its position with respect to the input end of the optical fiber. The light losses at the exit end of the light guide due to incorrect positioning can thereby be reduced in the light source device according to the invention in comparison to the prior art.

In contrast to the present invention, when the coupling optics are in fixed spatial relationship to the light source, if the light source is misplaced, the optical axis of the coupling optics becomes relative to the optical axis of the entrance end of the optical fiber, resulting in a shift of the focal point of the coupling optics relative to the optical axis of the entrance end of the optical fiber. As a result, a considerable part of the illumination light is no longer coupled into the entry end of the light guide in the event of incorrect positioning, which leads to a significantly reduced light intensity at the exit end of the light guide.

In the illumination device according to the invention, the first light source and the second light source can be arranged fixed in space. The light guide is then arranged to be movable at least in the region of its entrance end together with the coupling-in optics, the coupling-in optics being fixed relative to the entry end of the light guide. Alternatively, the first light source and the second light source may be arranged to be movable. In this case, the optical waveguide is spatially stationary at least in the region of its entrance end together with the coupling-in optics.

To enable the relative movement between the light sources and the entrance end of the light guide, the first light source and the second light source on the one hand and the entrance end of the light guide on the other hand can be arranged linearly displaceable relative to each other. Alternatively, it is also possible for the first light source and the second light source to be arranged at an angle to one another and for the light sources and the entry end of the light guide to be movable relative to one another such that the lamps move on a curve around the entry end of the light guide can be done. In principle, a rotation of the lamps or a rotation of the light guide is possible. Other configurations that allow a relative movement between the light sources on the one hand and the entrance end of the light guide on the other hand, are possible.

The coupling optics of the illumination device comprises in particular at least one convergent lens. This makes it possible to focus the illuminating light on the incident end of the optical waveguide, wherein the size of the luminous surface diameter of the convergent beam generated by the converging lens on the end face of the optical waveguide can be adapted to the size of the surface and the aperture angle of the beam to the maximum usable angle of incidence of the fiber.

It is advantageous if the optical axis of the coupling optics coincides with the optical axis of the entrance end of the optical waveguide. In particular, it is also advantageous for the first light source and the second light source to be assigned a device for generating a parallel illumination beam from the illumination light emitted by the light sources. By way of example, the device for generating a parallel illumination beam may comprise at least one parabolic reflector, which parallelises the illumination light emitted by the light sources. Alternatively, the means for generating a parallel illumination beam may comprise at least one converging lens for parallelizing the illumination light emitted to the light sources. In particular, it is advantageous if the first light source and the second light source for parallelizing the emitted illumination light each have their own parabolic reflector or a separate converging lens, which is spatially fixed relative to the respective light source. In this way, a sufficiently accurate parallelization of the light of the respective light source is always guaranteed. Alternatively, however, in principle it is also possible to provide only a single reflector or a single converging lens, in which case the possibility of a relative movement between the reflector or the lens on the one hand and the light sources on the other must be provided. The parallelization of the light emitted by the light source makes the coupling into the inlet end of the light guide from the axial distance of the light source to the inlet end of the light guide largely independent.

The coupling optics of the illumination device can contain further elements, for example an attenuator and / or at least one filter with which the intensity and / or the spectrum of the light coupled into the input end of the optical waveguide can be influenced. In addition, it may be designed as a multi-line system to reduce aberrations.

An optical observation device according to the invention is equipped with a lighting device according to the invention. Due to the presence of the illumination device according to the invention, the reduction of the illumination intensity in the case of an incorrect positioning during a change from the first light source to the second light source is reduced compared to the prior art. Overall, the optical observation device is thus less sensitive to incorrect positioning when changing from the first light source to the second light source.

The optical observation device may in particular be a medical optical observation device, such as a surgical microscope or endoscope. With such devices, which are typically used during an operation, diminutions of the light intensity due to misalignment in the change from the first light source to the second light source can be made more reliable by the lighting devices according to the invention avoided when using lighting devices according to the prior art.

Further features, properties or advantages of the present invention will become apparent from the following description of embodiments with reference to the accompanying figures.

1 shows the essential components of a surgical microscope in a schematic representation.

2 shows the essential components of the illumination device of the surgical microscope in a schematic representation.

3 shows a first representation of a relative to the entrance end of a light guide shifted light source.

4 shows a second representation of a relative to the inlet end of a light guide shifted light source.

5 shows a second embodiment of the lighting device.

6 shows a third embodiment of the lighting device.

This in 1 shown surgical microscope 1 comprises as essential constituents an observation object 3 facing lens 5 , which is shown in the present embodiment as an achromat or Apochromatlin constructed of at least two partial lenses cemented together. The observation object 3 is in the focal plane of the lens 5 arranged so that the tissue area 3 imaged to infinity, so one of the tissue area 3 outgoing divergent beam 7 in his passage through the lens 5 in a parallel beam 9 is converted.

Instead of just an achromatic lens, as in the present embodiment as a lens 5 An object lens system can be used from several individual lenses, such as a so-called zoom lens, with which the working distance of the surgical microscope 1 ie the distance of the focal plane from the lens 5 , lets vary. Even in such a Vario system is arranged in the focal plane tissue area 3 mapped to infinity, so that even with a zoom lens observer side, there is a parallel beam.

Observer side of the lens 5 is a magnification changer 11 arranged, which can be formed either as in the illustrated embodiment as a zoom system for stepless change of the magnification factor or as a so-called Galilei changer for stepwise change of the magnification factor. In a zoom system, which is constructed, for example, from a combination of lenses with three lenses, the two object-side lenses can be moved to vary the magnification factor. In fact, however, the zoom system can also have more than three lenses, for example four or more lenses, the outer lenses then being able to be fixed. In a Galilean changer, on the other hand, there are several fixed lens combinations that represent different magnification factors and that can be alternately introduced into the beam path. Both a zoom system and a Galilean changer convert an object-side parallel beam into an observer-side parallel beam with a different beam diameter. The magnification changer 11 is already part of the binocular beam path of the surgical microscope in the present embodiment 1 ie it has its own lens combination for each stereoscopic beam path 9A . 9B of the surgical microscope 1 on.

To the magnification changer 11 closes observer side an optional interface arrangement 13A . 13B on, via the external devices to the surgical microscope 1 can be connected and the beam splitter prisms in the present embodiment 15A . 15B includes. In principle, however, other types of beam splitters may also be used, for example partially transmissive mirrors. The interfaces 13A . 13B serve in the present embodiment for decoupling a beam from the surgical microscope 1 (Beam splitter prism 15B ) and for coupling a beam into one of the partial beam paths of the surgical microscope 1 (Beam splitter prism 15A ).

To the interface 13 closes observer side a binocular tube 17 at. This has two tube lenses 19A . 19B on which the respective parallel beam 9A . 9B on an intermediate image plane 21 focus, so the observation object 3 to the respective intermediate image plane 21A . 21B depict. The in the intermediate picture planes 21A . 21B intermediate images are finally from eyepiece lenses 25A . 25B in turn mapped to infinity, so that a viewer, such as a doctor or his assistant, can view the intermediate image with a relaxed eye. In addition, in the binocular tube by means of a mirror system or prisms 23A . 23B an increase in the distance between the two partial beams 9A . 9B to adjust it to the distance between the eyes of the beholder. With the mirror system or the prisms 23A . 23B In addition, a picture erection takes place.

The surgical microscope 1 is also with a lighting device 27 equipped with the tissue area 3 illuminated with illumination light. This is in the present embodiment of the surgical microscope 1 Remote located, for example. On the microscope stand, and includes a light guide 29 holding the illumination light to the surgical microscope 1 passes. In addition, the lighting device comprises 27 a first light source 31A and a second light source 31B which serves as a reserve light source. Both light sources are relative to the entrance end 33 of the light guide 29 slidably disposed in the direction of the arrow P, in case of failure of the first light source 31A quickly to the second light source 31B to be able to change without having to turn off the lighting device or to open. For optimizing the light coupling into the entrance end 33 of the light guide 29 this is a coupling optics 35 associated with the initiation end in a fixed spatial relationship.

In the in 1 The surgical microscope shown is the out of the light guide 29 emerging illumination light via a deflection mirror 37 as so-called oblique illumination of the observation object 3 fed. In such an oblique illumination of the beam path is at a relatively large angle (6 ° or more) to the optical axis of the lens 5 and can, as in 1 shown completely outside the lens. However, it is also possible, the illumination beam path of the oblique illumination through an edge region of the lens 5 pass through. An alternative possibility of illumination is the so-called 0 ° illumination, in which the illumination beam path through the lens 5 passes through and between the two partial beam paths 9A . 9B , along the optical axis of the lens 5 towards the fabric area 3 is coupled into the lens. Finally, it is also possible to carry out the illumination as so-called coaxial illumination, in which a first and a second illumination beam path are present. The partial beam paths are parallel to the optical axes of the observation partial beam paths via one or more beam splitters 9A . 9B coupled into the surgical microscope, so that the illumination is coaxial with the two observation partial beam paths.

2 shows the lighting device 1 in detail. It can be seen that the light sources 31A . 31B each with a parabolic reflector 32A . 32B are provided in whose focal point they are. The parabolic reflector 32A . 32B serves to that of the respective light source 31A . 31B outgoing divergent illumination beams into a parallel illumination beam 39 convert. The side of the light source facing away from the parabolic reflector may be assigned a further, smaller reflector which deflects light which is not emitted by the light source in the direction of the surface of the parabolic reflector in the direction of these surfaces. The active light source 31A is positioned so that it is as accurate as possible on the optical axis of the entrance end 33 of the light guide 29 lies. The reserve light source 31B can be done by moving the light sources along the arrow P to the position of the active light source 31A be moved if this fails.

As light sources all common light sources such as incandescent lamps, gas discharge lamps, semiconductor light sources, etc. in question. For example, halogen lamps or xenon lamps are often used. But even LEDs, for example, are increasingly being used.

By means of the coupling optics 35 that like in 2 represented in the simplest case of a condenser lens 35 is the light of the incident parallel illumination beam 39 focused on a focus F inside the entry end 33 of the light guide 29 lies. The distance of the last lens of the coupling optics 35 from the entry end 33 of the light guide 29 and the focal length of the coupling optics 35 are coordinated so that the diameter of the coupling optics 35 from the parallel beam 39 generated convergent beam 40 at the entry surface of the light guide corresponds to the diameter of this entrance surface and that the opening angle of the convergent beam to the maximum usable angle of incidence at the end face of the Einttrittsendes 33 corresponds or at least comes close. In this way, an optimized coupling of the light in the light guide 29 will be realized. The same optimization can also be achieved with a focus in front of the entrance surface. Instead of like in 2 just behind the entrance area of the entrance end 33 Therefore, the focus can also be just before the entrance surface. In addition, the coupling-in optics 35 instead of as in 2 represented consist of a single converging lens and a plurality of lenses, which may also include kit members. The use of a plurality of lenses may, for example, be advantageous in particular with regard to the correction of aberrations.

Optionally, the lighting device 27 also an optical filter 41 such as a heat protection filter to protect the coupling optics and / or the entrance end 33 of the light guide 29 before heat radiation, include. Such a filter 41 is therefore preferably between the light source 31 and the coupling optics 35 arranged. Between the coupling optics 35 and the entrance end of the light guide can also be a mechanical attenuator, such as a screen diaphragm, be arranged, which attenuates the intensity of the illumination light spectrally evenly. Before the end of the entrance 33 In addition, a spectral filter can be present in the optical waveguide in order to produce a desired spectral wavelength distribution of the illumination light. Such a filter can be part of a filter wheel, for example, which comprises a plurality of different spectral filters which can be alternately introduced into the beam path. The filters and the attenuator can in particular also be movable separately from the other components of the lighting device. As will be readily apparent to one skilled in the art, the filters and attenuator may be located at locations other than those shown.

In the lighting device 27 is the coupling optics 35 in their spatial position the entrance end 33 the light guide permanently assigned. Besides, the entry end is 33 of the light guide 29 fixed in its position in the present embodiment. If a lamp is replaced, therefore, the lamp 31B in the place of the lamp 31A moved without moving the coupling optics 35 he follows. Therefore, the optical axes of the coupling optics 35 and the entry end 33 of the light guide, even after lamp replacement identical, even if a positioning error of the reserve lamp 31B is present. The advantage thus achieved will be described below with reference to the 3 and 4 described, wherein 3 describes the situation in a conventional lamp changer, where the coupling optics 35 the lamp 31 is assigned and is therefore moved together with the lamp when inserting the reserve lamp. The lamp 31 has a positioning error d with respect to the entrance end 33 of the light guide 29 on. Inserting the reserve lamp in the in 2 illustrated lighting device according to the invention with a positioning error as in 3 is in 4 shown. In the 3 and 4 shown positioning errors are the same size.

3 shows a positioning error between the lamp 31 and the entrance end of the light guide 33 such that the optical axis OA of the light source _L 31 and the optical axis OA _{E of} the entrance end 33 of the light guide 29 are shifted by an amount d to each other. Because the condenser lens 35 , which represents the coupling optics in the present embodiment, together with the light source 31 is shifted, the optical axes of the lamp and the lens in this case remain identical at all times. This is the focus F of the lens 35 at any time on the optical axis OA _{L of} the lamp 31 , As a result, the focus at the distance d corresponding to the positioning error adjoins the optical axis OA _{E of} the entrance end 33 of the light guide 29 located. In the in 3 This extreme example would lead to the complete, from the convergent lens 35 outgoing convergent beams 40 the entry end 33 of the light guide 29 missed. It should be noted at this point that the positioning error d in the 3 and 4 for exaggeration of the effect is exaggerated. In contrast, typically occurring positioning errors would still be a part of the convergent beam 40 in the light guide 29 be coupled.

4 shows the situation with the same positioning error d as in 3 present when the lens 35 , which again represents the coupling optics, the entrance end 33 of the light guide 29 assigned. In this case, a lamp change will cause the lamp to shift alone 31 , If, due to the positioning error d, the optical axis OA _{L of} the lamp 31 opposite the optical axis OA _{E of} the entrance end 33 of the light guide 29 is shifted, remain the optical axes of the entrance end 33 and the lens 35 identical, so that also the focus F of the lens 35 continue inside the entrance end 33 of the light guide 29 lies. That by means of the lens 35 from the parallel beam 39 resulting convergent beams 40 will thus continue in the entry end 33 focused on the light guide. In comparison to 3 is clearly seen that continues to be a significant proportion of the convergent beam 40 can be coupled into the light guide. Although a mispositioning leads even if the Einkoppellinse 35 the entry end 33 the light guide is assigned to a loss of light, for example due to a no longer optimal adaptation of the opening angle of the convergent beam to the maximum usable angle of incidence of the light guide 29 and due to the refracted symmetry of the convergent beam 40 with respect to the optical axis OA _{E of} the entrance end 33 of the light guide. Nevertheless, with the same positioning error d as in 3 considerably more light in the light guide 29 coupled as if the coupling optics 35 together with the light source 31 would be moved.

Although an exchange of the first light source 31A against the second light source 31B In the described embodiment, by moving along the arrow P, the lighting device may also be formed so that the two light sources by rotating about an axis which is parallel to the optical axes of the light sources 31A . 31B runs between the two light sources, be replaced. It is also possible to replace the first light source 31A against the second light source 31B by a pivoting device too realize, with the two lamps around the focal point within the entrance end 33 let the light guide pivot. An example of such a lighting device is shown schematically in FIG 5 shown. In this case, it is advantageous if the coupling optics used 35 has no or the lowest possible coma error, since a mispositioning of the light source can be associated with an angular error, which leads to the parallel beam 39 of the illumination light at a small angle to the coupling optics 35 incident.

Unlike in 2 illustrated embodiment, in which the light sources 31A . 31B each a separate reflector 32A . 32B associated with the corresponding light source 31A . 31B is moved, there is also the possibility of a single reflector 32 and two opposite the reflector preferably perpendicular to the optical axis OA of the entrance end _E 33 movable light sources 31A . 31B to provide, as in 6 is shown. Both light sources 31A . 31B are then arranged within the reflector dimensions and can be moved in the direction of the arrow shown in the figure. In case of failure of the light source 31A then can the replacement light source 31B be pushed into the focus of the reflector. This embodiment allows a particularly compact design of the lighting device. To the displacement perpendicular to the optical axis of the OA _{E of} the entrance end 33 to allow, for example, a recess in the reflector may be present, through which a holder with a displacement device for the light sources 31A . 31B passed through. The holder can also supply power to the active light source 31 respectively.

Instead of the light sources as described so far 31 displaceable, rotatable or pivotable to arrange, it is also possible to keep the lamps stationary and instead at least the entrance end 33 of the light guide 29 correspondingly displaceable, rotatable or pivotable to arrange. In this case, the coupling optics is so spatially fixed to the entrance end 33 of the light guide 29 connected to them when moving, turning or pivoting the entrance end 33 with postponed, with turned or pivoted so that they are in their on the entrance end 33 fixed position remains fixed.

Further modifications to the described embodiments are possible. For example, instead of a parabolic reflector for generating the parallel beam 39 one of the respective light source, for example, permanently assigned converging lens find use, in the focal point of the light source is arranged. In order to increase the luminous efficacy of the light sources, they can also be provided with a reflective layer that reflects light that is not emitted in the direction of the converging lens in the direction of the converging lens. Likewise, the number of light sources in the lighting device is not limited to two. In principle, as many light sources can be present as the lighting device can accommodate, without being unwieldy in their dimensions. Furthermore, the light source (or the other light sources) need not be a reserve light source. It is also possible to use light sources with different spectral characteristics, which can be used as needed.

The present invention provides an illumination device for an optical observation device, in particular for a medical optical observation device such as a surgical microscope or an endoscope, which enables a rapid replacement of the illumination light source and thereby has a high tolerance to incorrect positioning when changing the light source.

LIST OF REFERENCE NUMBERS

1

surgical microscope

3

observation object

5

lens

7

divergent beam

9

parallel beam

11

magnification changer

13

Interface arrangement

15

Beam splitter prism

17

binocular

19

tube objective

21

Intermediate image plane

23

prism

25

eyepiece

27

lighting device

29

optical fiber

31

light source

32

parabolic reflector

33

entry end

35

converging lens

37

deflecting

39

parallel beam

40

convergent beam

41

filter

43

mechanical weakening

45

filter

F

focus

OA _L

optical axis of the light source

OA _E

optical axis of the entrance end of the optical fiber

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• CN 2645097 Y [0002]

Claims (15)

Lighting device ( 27 ) with a first light source ( 31A ) for emitting illumination light and at least one second light source ( 31B ) for emitting illumination light and with a light guide ( 29 ), which is an entry end ( 33 ), in which the illumination light is coupled, and a coupling-in optics ( 35 ) for coupling the illumination light in the entrance end ( 33 ) of the light guide ( 29 ), the first light source ( 31A ), the second light source ( 31B ) and the entry end ( 33 ) of the light guide ( 29 ) are arranged so as to be movable relative to one another and are positionable relative to one another such that optionally the illumination light of the first light source ( 31A ) or the illumination light of the second light source ( 31B ) into the entrance end ( 33 ) of the light guide ( 29 ) can be coupled, characterized in that the coupling-in optics ( 35 ) with the entry end ( 33 ) of the light guide ( 29 ) is in a fixed spatial relationship such that this spatial relationship is due to a relative movement between the light sources (FIG. 31A and 31B ) and the entry end ( 33 ) of the light guide ( 29 ) undergoes no change. Lighting device ( 27 ) according to claim 1, characterized in that the first light source ( 31A ) and the second light source ( 31B ) are arranged spatially fixed and the light guide at least in the region of its entrance end ( 33 ) together with the coupling optics ( 35 ) is movably arranged, wherein the coupling optics ( 35 ) relative to the entry end ( 33 ) of the light guide is fixed. Lighting device ( 27 ) according to claim 1, characterized in that the first light source ( 31A ) and the second light source ( 31B ) are movably arranged and the light guide ( 29 ) at least in the area of its entrance end ( 33 ) together with the coupling optics ( 35 ) is arranged spatially stationary. Lighting device ( 27 ) according to one of claims 1 to 3, characterized in that the first light source ( 31A ) and the second light source ( 31B ) on the one hand and the entry end ( 33 ) of the light guide ( 29 ) On the other hand are arranged relative to each other linearly displaceable. Lighting device ( 27 ) according to one of claims 1 to 3, characterized in that the first light source ( 31A ) and the second light source ( 31B ) are arranged at an angle to each other and that the light sources ( 31A . 31B ) and the entry end ( 33 ) of the light guide ( 29 ) are arranged so movable relative to each other, that a relative movement of the light sources ( 31A . 31B ) on a curve around the entrance end ( 33 ) of the light guide can take place around. Lighting device ( 27 ) according to one of claims 1 to 5, characterized in that the coupling optics at least one convergent lens ( 35 ). Lighting device ( 27 ) according to one of claims 1 to 6, characterized in that the optical axis of the coupling-in optics ( 35 ) with the optical axis of the entrance end ( 33 ) of the light guide ( 29 ) coincides. Lighting device ( 27 ) according to one of claims 1 to 7, characterized in that the first light source ( 31A ) and the second light source ( 31B ) An institution ( 32A . 32B ) for generating a parallel illumination beam ( 39 ) from the light sources ( 31A . 31B ) is assigned associated illumination light. Lighting device ( 27 ) according to claim 8, characterized in that the means for generating a parallel Bluchtungsungsbündels ( 39 ) at least one parabolic reflector ( 32 ) having. Lighting device ( 27 ) according to claim 8, characterized in that the means for generating a parallel illumination beam has at least one converging lens. Lighting device ( 27 ) according to claim 9 or claim 10, characterized in that the first light source ( 31A ) and the second light source ( 31B ) each have their own parabolic reflector ( 32A . 32B ) or have their own converging lens, the spatially or relative to the respective light source ( 31A . 31B ) is fixed. Lighting device ( 27 ) according to one of claims 1 to 11, characterized in that the coupling-in optics ( 35 ) an attenuator ( 43 ) and / or at least one filter ( 41 . 45 ). Optical observation device with a lighting device ( 27 ) according to one of claims 1 to 12. Optical observation device according to claim 13, characterized by its design as a medical optical observation device. Optical observation device according to claim 14, characterized by its design as a surgical microscope or endoscope.

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