EP2863112B1 - Surgical LED light - Google Patents

Description

The invention relates to a surgical light according to the preamble of claim 1.

Generic surgical lights have a luminaire housing, via which the surgical light can be mounted on an external element. The luminaire housing is thus fixed in position during the stationary operation of the surgical light to the external element. The luminaire housing ensures that the surgical light can be arranged in a fixed position at a specific location. The luminaire housing can be movably mounted on the external element, for example via joints, so that the surgical luminaire housing can be moved to align the surgical light with the external element.

Furthermore, generic surgical lights have a light source carrier on which a plurality of light sources are arranged. It has proven to be advantageous to use LEDs and / or OLEDs and / or laser diodes as the light source, since such bulbs can emit light with a high illumination intensity, without at the same time emitting a high intensity of thermal radiation in the light emission direction. This is in particular due to the fact that the wavelength distribution of such lamps can be adjusted so that they only one low proportion of long-wave radiation, such as infrared radiation includes. Furthermore, this is particularly due to the fact that such bulbs may have a higher efficiency than conventional bulbs, such as halogen or discharge lamps, so that a higher light intensity of the radiated light can be ensured with a lower heat dissipation. The use of such bulbs is particularly advantageous for the generic surgical lights, especially as in surgical lights, a strong heat in the illuminated from the surgical light surgical field is to be avoided to avoid heating of open wounds.

Generic surgical lights further include a reflector having a light incident side and an optical axis and which is formed so that light incident on the light incident side of the reflector is reflected on the light incident side of the reflector and thereby focused to the optical axis becomes. The light incidence side is thus at the same time the light failure side of the reflector. On the light incidence side of the reflector, the light source carrier is arranged, wherein the bulbs are arranged on the illuminant carrier and the illuminant carrier to the reflector so that the bulbs at least partially radiate light on the light incidence side of the reflector, in particular all the light emitted by them at least partially on the Emit the light incidence side of the reflector. Thus, the light incidence side of the reflector is defined in particular by the fact that the reflector bundles light which is emitted by the illuminants on the light incidence side in the described arrangement of reflector, illuminant carrier and illuminant to the optical axis.

The reflector can be assigned a focus that indicates at which distance along the optical axis, viewed from its end opposite the light incidence side, the reflector focuses the light onto a specific cross section. It is obvious to the person skilled in the art that the focus of the reflector depends on the relative position of the illuminant carrier to the reflector and on the emission characteristic of the illuminant arranged on the illuminant carrier. Both the diameter and the shape of the area illuminated by the arrangement of the illuminant carrier with the illuminants and the reflector can depend on the relative position of the illuminant carrier relative to the reflector. For example, the shape and / or size of the illuminated area located at a given distance along the optical axis of the array depends on whether the illuminant carrier is spaced along the optical axis or in a direction perpendicular to the optical axis from the optical axis is arranged and of which relative position of the illuminant carrier along the optical axis to the reflector occupies, ie, at which distance the illuminant carrier from the light incident side of the reflector opposite end of the reflector is arranged.

In generic surgical lights, the relative position of the illuminant carrier is changeable to the reflector, so that the focus of the surgical light on a change in the relative position is variable. Furthermore, in generic surgical lights of the lamp carrier is thermally conductively connected to a heat radiating element, so that heat that is produced at the bulbs, when the bulbs emit light, can be dissipated. The heat dissipation is particularly important in the use of bulbs such as LEDs, OLEDs and / or laser diodes, since such bulbs produce considerable heat and their efficiency decreases with increasing temperature. In generic surgical lights the heat radiating element is arranged on the opposite side of the light incident side of the reflector, so that a heat radiation in the direction of the surgical field, which is illuminated by the surgical light, is avoided. Furthermore, it has proven to be advantageous to design the heat radiating element over a large area in order to ensure efficient dissipation of heat away from the illuminant carrier.

In conventional surgical lights several bulbs are provided, in particular several LEDs, OLEDs or laser diodes, so that a sufficiently high light intensity of the surgical light can be guaranteed. The arrangement of a plurality of lamps on the lamp carrier brings the problem of heat dissipation of the heat generated by the various lamps with it. In conventional surgical lights, this problem is solved in that the lamp carrier is designed in the manner of a cylinder, on the outer lateral surface of the bulbs are arranged. The light source carrier has a high thermal conductivity along its cylinder axis, so that the heat generated by the light sources can be dissipated well via the light source carrier, the light source carrier being heat-conductively connected to the heat radiating element, via which the heat is finally radiated over a large area. In this case, the axis of the cylinder of the illuminant carrier is aligned along the optical axis, so that the arrangement of the illuminant carrier in the reflector as little as possible affects the generation of a radiation area which is illuminated by the reflector. One embodiment of such a conventional surgical light is in the document DE 10 2007 042 646 A1 described. Another conventional surgical light is in the document US 2011/0317411 A1 disclosed. The surgical light disclosed there has a plurality of reflectors, each reflector being associated with a light source. The light source is disposed on the light incident side of its associated reflector and adapted to emit light on the reflector. The reflector focuses the light emitted by the light source and reflects it on the light incidence side. At its side facing away from the reflector, a cooling element is arranged on the light source. In each case a group of reflectors and the reflectors associated light sources is formed as a coherent light source unit. To adjust the focus of the surgical light, the various light source units can be tilted relative to the optical axis of the surgical light.

Corresponding generic surgical lights have the disadvantage that the homogeneous illumination of a particular illumination area through the surgical light only difficult and / or can be achieved inadequately. So that a homogeneous illumination can be achieved by such a generic surgical light, in each case separate optical elements must be assigned to the respective light sources, which is costly and expensive. Because the emission characteristics of each light source on the light incidence side of the reflector must be selectively adjusted via an associated optical element in each case so that with the surgical light comprising the combination of light source, bulbs and reflector, a region can be homogeneously illuminated. This is all the more difficult as generic surgical lights are just designed so that their focus can be changed, which makes it more difficult to provide a homogeneous illuminated area by the surgical light.

The invention has for its object to provide a surgical light that at least partially solves the disadvantages of generic surgical lights described above at least.

As a solution to the problem of the invention, the invention proposes an operating theater lamp with the features of claim 1. This surgical light according to the invention is characterized in that the illuminant carrier has a flat portion whose surface extends perpendicular to the optical axis of the reflector, wherein the bulbs are distributed over the surface of the planar portion.

The planar configuration of the illuminant carrier and the arrangement of the illuminant over the surface brings several advantages. On the one hand, this ensures that all illuminants have the same distance along the optical axis, ie measured in the direction of the optical axis, to the end of the reflector opposite the light incidence side. This makes it much easier to include a reflector through the surgical light and illuminant to provide homogeneously illuminated area. For example, this allows a much simpler design of the reflector than in conventional surgical lights, with which a homogeneously illuminated area can be provided. The reflector may be bell-shaped, for example. For example, the reflector may have the shape of a plurality of tangentially intersecting curves. For example, the reflector may be faceted. On the other hand, additional optical elements for further optimization of the area illuminated by the surgical light, such as, for example, reflectors or lenses arranged on the light sources, can be made considerably simpler than in the case of generic surgical lights. In generic surgical lights, each illuminant is assigned to one specific optical element. In contrast, a very simple embodiment of such an additional, optional optical element is possible because of the simple, planar inventive design of the illuminant carrier and the uniform spacing of all bulbs along the optical axis to the light incident side opposite end of the reflector. In particular, the same optical element can be provided for all lamps. Furthermore, a light source carrier with a larger area can be realized by the planar configuration perpendicular to the optical axis of the reflector, so that a better heat dissipation over the light source carrier can be ensured to the heat radiating.

The invention is based on the finding that a light source carrier can be used with a planar section which runs perpendicular to the optical axis of the reflector, without adversely affecting the emission characteristic of the surgical light. From this measure has been used in conventional Surgical lamps refrained, since it was assumed that the extension of the illuminant carrier perpendicular to the optical axis must be kept as low as possible in order to ensure a good radiation characteristics of the surgical light. The inventors have just realized that this is not the case, but that the provision of a corresponding illuminant carrier brings the particular advantages described. It is always based on the definition of the optical axis that the optical axis of the reflector is determined by the fact that the surgical light, which comprises the reflector, emits light substantially in the direction of the optical axis of the reflector. In particular, the optical axis of the reflector extends substantially, in particular precisely through the center of the area which the surgical light illuminates in a plane perpendicular to the optical axis.

According to an advantageous embodiment of the invention, the surgical light comprises an optical system which is arranged between the lighting means and the reflector. By way of example, the optical system can comprise one or more additional reflectors and / or one or more lenses, which are arranged relative to the lighting means such that the emission characteristic of the lighting means is influenced by the light incident side of the reflector. In particular, the optical system can be designed so that it ensures such a light deflection of the light emitted by the bulbs light, that the light is evenly distributed to a portion of the reflector, whereby a homogeneous illumination can be ensured by the surgical light. The optical system can be arranged, for example, on the illuminant carrier. In particular, because of the inventive design of the illuminant carrier, which has a flat portion perpendicular to the optical axis of the reflector, a homogeneous optical system, in particular a be provided rotationally symmetrical optical system. The optical system may be formed integrally, for example. For example, the optical system may consist of several pieces, which are arranged on the illuminant carrier juxtaposed. The optical system makes it possible to influence the emission characteristic of the surgical light, in particular to adjust it particularly advantageous.

In an advantageous embodiment, the surgical light on a lens at the lying on the light incidence side of the reflector. The lens makes it possible to further influence the emission characteristics of the surgical light. For example, the lens can affect the light color of the radiated light, for example, the lens can ensure a light steering, so that the lens has influence on the geometric shape of an illuminated area of the surgical light. The cover plate may for example be arranged directly on the reflector, for example, be spaced from the reflector.

Preferably, the lighting means are as close as possible, in particular immediately adjacent, arranged side by side on the light source carrier. Advantageously, the lighting means are arranged according to the shape of a ring through the center of which the optical axis passes, in particular according to the shape of a plurality of rings which are concentric with the optical axis as the center. An appropriate arrangement of the bulbs can bring the advantage that a particularly uniform emission characteristics of the surgical light is guaranteed. This can be the case in particular if, due to the corresponding circular arrangement of the lighting means, all the lighting means are at the same distance from the light source Surface of the reflector and / or due to the annular arrangement have the same distance from the optical axis. In particular, an annular arrangement of the lighting means allow a particularly simple embodiment of an additional optical element, with which the emission characteristic of the surgical light can be additionally positively influenced. The corresponding annular arrangement about the optical axis is particularly advantageous when the relative position of the illuminant carrier to the reflector along the optical axis is variable. For in particular then can be ensured by the annular arrangement, a particularly homogeneous radiation characteristic. The annular arrangement means that the bulbs are arranged substantially annular, the annular arrangement can also be ensured by a polygonal, approximated to a ring shape arrangement, which bring the same advantages described. Preferably, illuminants with different light colors are provided, which are arranged homogeneously distributed on the illuminant carrier, so that a homogenous light color of the surgical illuminator over the emission area is ensured.

In an advantageous embodiment, the illuminant carrier is designed as a heat-conducting element. In particular, the illuminant carrier may have a heat-conducting layer, in particular a copper layer (Cu layer). In particular, according to the invention, the thermally conductive design of a material can be realized in such a way that the material has a thermal conductivity of at least 200 W / mK at room temperature. In particularly advantageous embodiments, the heat-conducting materials according to the invention have a thermal conductivity of at least 350 W / mK at room temperature. This ensures a particularly good heat dissipation away from the light sources. For example For example, the light source carrier can have a printed circuit board on which LEDs are arranged as light sources, wherein the light source carrier has a further layer which has very good heat-conducting properties. By way of example, such a heat-conducting layer may also consist of or comprise any other heat-conducting material, for example heat-conducting metal. In particular, the heat-conducting layer can be formed like a plate on which the bulbs are arranged, for example via a circuit board. It is essential that a very good heat dissipation from the light sources to the heat radiating element is ensured by the heat-conducting layer.

In an advantageous embodiment, the light source carrier is connected to a heat-conducting body, wherein the heat-conducting body is connected to the heat-radiating element in a heat-conducting manner. The heat-conducting body can then also produce a heat-conducting contact between the illuminant carrier and the heat-radiating element when the illuminant carrier is far away from the heat-radiating element. The provision of the heat-conducting body has the advantage that the heat-radiating element can be arranged over a large area and at an advantageous location of the surgical light that is selected for the heat radiation, without having to consider the position of the illuminant carrier within the reflector. The heat-conducting body may be formed, for example, as a rigid heat pipe, which may be realized for example as a cylinder, for example as a copper cylinder. A thermally conductive contact between the heat radiating element and the heat pipe and / or between the illuminant carrier and the heat pipe can be realized, for example, via a sliding contact, as a possible alternative, for example, via a cohesive contact, which can be produced for example by soldering or welding. For example, it may be advantageous to use at least one of the compounds be made flexible between the heat conducting body and the illuminant carrier or between the heat conducting body and the heat radiating element in the sense that the position of the illuminant carrier can be changed to the heat radiating element while maintaining a heat-conducting contact between the illuminant carrier and the heat radiating element. This can be realized, for example, by providing at least one sliding connection.

It has proved to be particularly advantageous to produce such a flexible, heat-conducting connection between the illuminant carrier and the heat-radiating element by at least one heat conduction band, in particular a Cu band, which produces, for example, the heat-conducting connection between heat-conducting body and heat-radiating element and / or between illuminant carrier and heat-conducting body. Because of their deformability and flexibility, heat conduction tapes according to the invention are particularly well suited for producing and ensuring a flexible heat-conducting contact.

In an advantageous embodiment, the extension of the Wärmeleitkörpers parallel to the optical axis of the reflector is substantially longer than its extension perpendicular to the optical axis. In particular, the corresponding ratio of said extensions may be at least 2: 1, in particular at least 5: 1.

By this arrangement, for example, the least possible impairment of the homogeneity of the radiated light in the illuminated area can be ensured by the heat conducting body. For this purpose, it can be particularly advantageous if the heat-conducting body extends along the optical axis of symmetry of the reflector, in particular if an axis of the heat-conducting body coincides with the optical axis. Corresponding advantageous arrangements of the Wärmeleitkörpers can in particular also advantageous for the displaceability of the illuminant carrier along the optical axis within the reflector while maintaining a heat-conducting contact between the illuminant carrier and heat radiating be advantageous, for example via said plain bearings and / or Wärmeleitbandverbindungen. As a result, it is possible, for example, to ensure a change in the focus of the surgical light while maintaining a heat-conducting contact between the illuminant carrier and the radiating element.

Advantageously, the surgical light on a heat sink, which is arranged on the heat-conducting body and which is thermally conductively connected to the heat radiating element. As a result, a particularly good heat-conducting contact between the heat-conducting body and the heat-radiating element can be ensured. In particular, the heat sink can be designed so that a heat-conducting connection between the heat-conducting body and the heat-radiating element can be realized with a large cross section, so that the thermal conductivity of the connection is increased. In particular, the heat sink may be formed and arranged on the heat conducting body such that the maximum cross section of the heat conducting body is substantially smaller perpendicular to the optical axis than the maximum cross section of the arrangement consisting of heat conducting body and heat sink, in particular smaller by at least 50%. The heat sink may for example have the shape of a hollow cylinder with considerable wall thickness, within which the heat conducting body is arranged.

The provision of a heat sink is advantageous, in particular in combination with the provision of a heat conduction band described above, since the heat conduction tape can lie over a large area on the heat sink, which is particularly advantageous for the heat conduction contact. It should be noted in particular that the heat conducting body substantially the removal of heat from the Light source carrier is used for heat radiating element and is not itself designed so large area that it ensures high heat radiation. Rather, the heat-conducting body just serves to dissipate heat from the light source carrier, so that the heat can be radiated at some distance from the light source and thus on the one hand, the heat of the surgical light in the illuminated area is kept low and on the other hand, the heating of the light source and thus a reduction in the efficiency of lamps on the lamp carrier is avoided.

Advantageously, the lamp carrier is rigidly connected to the heat conducting body, wherein the relative position of the heat conducting body to the reflector by a change in the position of the heat conducting relative to the surgical lamp housing is variable, while the position of the reflector remains unchanged to the surgical lamp housing. In this way, a change in the position of the illuminant carrier to the reflector can be achieved by displacing the heat-conducting body relative to the OP luminaire housing. For this purpose, the light source carrier may be connected to the heat conducting body such that no relative movement between the light source carrier and the heat conducting body is possible. The heat-conducting body, however, is movably arranged to the surgical light housing. For this purpose, the heat-conducting body can be connected, for example via sliding bearings and / or guides with the surgical light housing. Such a connection is particularly easy to implement by the heat conducting body is cylindrical and is guided in corresponding hollow cylindrical guides, which are arranged on the surgical light housing. The described advantageous embodiment of the surgical light allows a particularly simple design of an operating light while ensuring a heat-conducting contact between the light source and Heat radiating element and adjusting a focus of the surgical light. For this purpose, it is particularly advantageous if the position of the heat conduction body relative to the surgical lamp housing along the optical axis is variable.

In another advantageous embodiment, the relative position of the illuminant carrier is variable to the reflector via a change in the position of the reflector relative to the surgical lamp housing, while the position of the illuminant carrier remains unchanged to the surgical lamp housing. This can be realized by a corresponding mounting of the reflector on the lamp housing. As described above, it may be particularly advantageous for adjusting the focus of the surgical light when the reflector is arranged to the surgical lamp housing so that a change in the position of the reflector, a relative change in position of the illuminant carrier to the reflector along the optical axis of the reflector allows. Such an arrangement of the reflector to the surgical light housing can be realized via a corresponding guide of the reflector, in particular sliding of the reflector, the surgical light housing. The change in the position of the illuminant carrier to the reflector via a change in the position of the reflector to the surgical lamp housing brings with it various advantages. On the one hand, the illuminant carrier can remain rigidly connected to the surgical luminaire housing, while at the same time a change in the focus of the operating light is possible. As a result, for example, a particularly simple electrical contacting of the lighting means with electrical lines in the luminaire housing can be realized. Also, the reflector can be arranged because of its larger dimensions particularly easy to move to the surgical light housing, in particular easier than the light source carrier. Furthermore, on the design of a movable connection between the reflector and surgical lamp housing on the Outside of the reflector does not affect the radiation characteristics of the surgical light, which is often not achievable in the establishment of a movable arrangement of the illuminant carrier to the operating room lamp housing. It results from the described advantage that the design of an operating light is such that the relative position of the illuminant carrier relative to the reflector can be changed by changing the position of the reflector relative to the operating theater housing, while the position of the illuminant carrier can be adjusted to the operating position. Luminaire housing remains unchanged, and may also be generally advantageous for generic surgical lights, which is why the invention also relates to a corresponding advantageously designed over this generic surgical light.

In an advantageous embodiment, the reflector is guided over guide pins which run parallel to the optical axis. As a result, a uniform change in the position of the reflector along the optical axis can be ensured, which can ensure a particularly uniform change in the focus of the surgical light and thus the radiated from the surgical light area. Advantageously, the guide pins are arranged outside of the reflector, so that they do not affect the radiation characteristics of the surgical light. Advantageously, the surgical light comprises at least one electric motor, in particular two to the optical axis mutually symmetrically arranged electric motors for displacing the reflector parallel to the optical axis. The electric motor can ensure a stepless and smooth change of the relative position of the reflector to the surgical light housing. By arranging two electric motors symmetrically arranged relative to one another with respect to the optical axis, tilting and jamming of the reflector during the change of focus via a change in the position of the reflector along the optical axis can be particularly effective be avoided.

Advantageously, the surgical light comprises a support ring, through the center of which the optical axis runs and on which the at least one electric motor is arranged. Advantageously, the support ring is arranged outside the reflector and surrounds the reflector on its outer side, which faces away from the light incidence side. As a result, the support ring does not affect the radiation characteristics of the surgical light and at the same time ensures a fixation of the electric motor to the surgical light housing. The support ring is rigidly connected to the surgical light housing. The electric motors can be supported via the support ring on the surgical light housing for holding the reflector and for changing the position of the reflector to the surgical light housing. The fact that the center of the support ring extends through the optical axis, the reflector can be particularly easily arranged centrally within the support ring, so that the support ring allows a particularly good fixation of the reflector. In particular, guide pins can be arranged on the support ring, which serve for the additional guidance of the reflector.

In a particularly advantageous embodiment, the relative position of the illuminant carrier to the reflector, in particular along the optical axis, via a change in the position of the reflector relative to the surgical lamp housing and by changing the position of the Wärmeleitkörpers relative to the surgical lamp housing changeable. In particular, corresponding sliding connections between the illuminant carrier and the OP luminaire housing and / or between the heat conduction body and the OP luminaire housing and / or between the reflector and the OP luminaire housing can be provided. By a corresponding advantageous embodiment, an adjustment of the focus of the surgical light over a particularly wide range to be guaranteed. The respective connections for enabling the variation of the respective relative positions may be realized as described above. For example, the surgical light can be designed so that a change in the relative position of the illuminant carrier to the surgical lamp housing and a change in the relative position of the reflector to the surgical lamp housing can be realized simultaneously. For example, the surgical light can be designed so that said position changes can only be carried out one after the other.

In the following, the invention will be explained in more detail with reference to seven figures, in which embodiments of the invention are illustrated.

Figur 1:

in einer Prinzipdarstellung einen Ausschnitt einer Anordnung, wie sie in einem Ausführungsbespiel der erfindungsgemäßen OP-Leuchte zum Einsatz kommt;

Figur 2:

in einer Prinzipdarstellung einen Ausschnitt einer Anordnung, wie sie in einem anderen Ausführungsbeispiel der erfindungsgemäßen OP-Leuchte zum Einsatz kommt;

Figur 3:

in einer Prinzipdarstellung einen Ausschnitt einer weiteren Anordnung, wie sie in einem anderen Ausführungsbeispiel der erfindungsgemäßen OP-Leuchte zum Einsatz kommt;

Figur 4:

in einer Prinzipdarstellung einen Ausschnitt einer weiteren Ausführungsform der erfindungsgemäßen OP-Leuchte;

Figur 5:

in einer Prinzipdarstellung einen Ausschnitt eines weiteren Ausführungsbeispiels der erfindungsgemäßen OP-Leuchte;

Figur 6:

in einer Prinzipdarstellung einen Ausschnitt einer Anordnung, wie sie in einem weiteren Ausführungsbeispiel der erfindungsgemäßen OP-Leuchte zum Einsatz kommt;

Figur 7:

in einer Prinzipdarstellung einen Ausschnitt einer Anordnung, wie sie in einer weiteren Ausführungsform der erfindungsgemäßen OP-Leuchte zum Einsatz kommt.

Show it:

FIG. 1:

in a schematic representation of a section of an arrangement, as used in an exemplary example of the surgical light according to the invention is used;

FIG. 2:

in a schematic representation of a section of an arrangement as it comes in another embodiment of the surgical light according to the invention is used;

FIG. 3:

in a schematic representation of a section of another arrangement, as used in another embodiment of the surgical light according to the invention is used;

FIG. 4:

in a schematic representation of a section of another embodiment of the surgical light according to the invention;

FIG. 5:

in a schematic representation of a section of another embodiment of the surgical light according to the invention;

FIG. 6:

in a schematic representation of a section of an arrangement as it comes in a further embodiment of the surgical light according to the invention is used;

FIG. 7:

in a schematic representation of a section of an arrangement as it comes in a further embodiment of the surgical light according to the invention is used.

In FIG. 1a is an arrangement comprising a reflector 3, a heat radiating element 7, a light source carrier 1 with a circuit board 101, a heat conducting body 8, a plurality of LEDs 2, which are provided as a light source, a lens 9 and a group reflector 4 comprises. In FIG. 1a is a schematic diagram of this arrangement is shown, from which shows how in particular the light source carrier 1 with the LEDs 2 arranged thereon, the group reflector 4 and the reflector 3 cooperate. In FIG. 1a on the other hand, is not the assembly of the individual components that are included in the illustrated arrangement, shown in the surgical light itself.

In the embodiment according to FIG. 1 the reflector 3 is rotationally symmetrical. In this case, the reflector 3 has facets and is designed such that it focuses light which strikes the reflector 3 from the illuminant carrier 1 at the light incidence side in the direction of its optical axis 50. The heat conducting body 8 extends along the optical axis 50 of the reflector 3. The longitudinal axis of the heat conducting body 8 coincides with the optical axis 50. The heat-conducting body 8 is like the reflector. 3 formed rotationally symmetrical. In the present embodiment, the heat conducting body 8 is formed as a copper cylinder.

In the in FIG. 1 illustrated embodiment are as shown FIG. 1a It can be seen that the LEDs 2 are arranged on the circuit board 101 of the illuminant carrier 1 in an annular manner about the optical axis 50 of the reflector 3. The illuminant carrier 1 is designed as a heat-conducting element. The heat-conducting body 8 is connected to the illuminant carrier 1 and the heat-radiating element 7 such that the illuminant carrier 1 is connected to the heat-radiating element 7 in a heat-conducting manner. As a result, heat can be dissipated from the illuminant carrier 1 to the heat-radiating element 7 via the heat-conducting body 8. The heat radiating element 7 is arranged at the end of the reflector 3 opposite the light entry side in a large-area recess of the reflector 3 and can radiate heat particularly efficiently because of its large surface area. Thus, the heat radiation takes place so that as little heat as possible from the surgical light, in which the in FIG. 1 shown arrangement is used, illuminated area is emitted.

From the FIGS. 1a . 1b and 1c In particular, the interaction of LEDs 2, group reflector 4 and reflector 3 can be seen. The LEDs emit light in a wide solid angle. A portion of the light emitted by the LEDs 2 passes directly to the reflective inner side, ie the light incidence side, of the reflector 3 and is deflected or focused there via the reflective facets of the reflector 3 in the direction of the optical axis 50. In Figure 1c is the course of the light emitted by an LED 2, exemplified. Out Figure 1c At the same time it can be seen that part of the light emitted by the LED 2 is emitted by the group reflector 4 is reflected, so that this part of the light emitted by the LED 2 light passes through the group reflector 4 to the reflector 3, from which it is then focused to the optical axis 50 back.

In the embodiment according to FIG. 1 Both the reflector 3 and the arrangement of the LEDs 2 on the illuminant carrier 1 and the group reflector 4 have a rotational symmetry about the optical axis 50. In general, it may be advantageous that the arrangement of the lighting means and the reflector and in particular the optionally provided optical system have the same symmetry, since this can be ensured by simple measures a homogeneous radiation characteristic of the surgical light. In the embodiment according to FIG. 1 Thus, only one group reflector 4 is necessary to ensure high intensity in a uniformly radiated area through the surgical light. In this case, the group reflector 4 can be designed in several parts. In the present embodiment, the group reflector 4 is formed in two parts and consists of two halves which are arranged around the optical axis 50 by being placed side by side. The group reflector 4 describes in its cross section a curve that extends away from the optical axis 50 starting from the illuminant carrier 1 in the direction along the optical axis 50. The group reflector 4 is faceted. In other embodiments, not shown, the group reflector 4 may be configured differently.

Characterized in that the arrangement of the LEDs 2 and the reflector 3 have the same symmetry, a particularly uniform emission of a surgical field can be ensured by the surgical light. In addition, in the illustrated exemplary embodiment, the group reflector 4 also contributes to this. By providing the Group reflector 4 is in particular also ensured that the heat-conducting body 8 generates no shadow in the area emitted by the surgical light area.

In FIG. 2 is a further arrangement comprising reflector 3, light source carrier 1 with board 101, LEDs 2, heat radiating element 7 and 8 heat conducting body shown. From the in FIG. 1 The arrangement shown differs in FIG. 2 shown arrangement in that no group reflector 4 is provided. Instead, a first lens 5 is provided as the optical element, which is provided between the reflector 3 and LEDs 2, and a second lens 6, which is provided between the optical axis 50 and the LEDs 2. The interaction of the lenses 5, 6 with the LEDs 2 and the reflector 3 is off Figure 2c it can be seen, the relative arrangement of the lenses 5, 6 and the LEDs 2 is in particular made FIG. 2b seen. Out Figure 2c It can be seen that the lenses are so formed and arranged to the LEDs 2, that light rays emitted by the LEDs 2 can not escape to the optical axis 50 of the reflector 3 out of the lenses 5, 6, but all of the optical axis 50 are directed away to the inside of the reflector 3. For this purpose, it is generally advantageous to design the lenses of the optical system used with asymmetrical cross-section, as is also the case in the described embodiment, see lenses 5, 6 in FIG. 2b ,

About the faceted design of the reflector 3, the light beams emitted by the LEDs 2 are bundled to the optical axis 50 of the reflector 3 out. How to the in FIG. 1 Example described is also with the according to FIG. 2 arrangement shown a uniform illumination of a range by an operating light according to the invention, in which the in FIG. 2 shown arrangement is used, guaranteed. The lenses 5, 6 each have same symmetry as well as the reflector 3 and as well as the arrangement of the LEDs 2. In the described embodiment, this is a rotational symmetry about the optical axis 50. This further contributes to the homogeneous illumination and the simple design of the lenses 5, 6. The lenses 5, 6 are each composed of four parts in the present embodiment, which are arranged side by side so as to form a ring. In FIG. 2a two parts of the optical lenses 5, 6 are shown, which are arranged side by side and together form a semicircle.

Out FIG. 2b It can be seen that the lenses 5, 6 are each formed differently, since the lenses 5, 6 must each have a different light diffraction or refractive characteristic in order to the described and in particular in Figure 2c To achieve apparent effect with the appropriate light control of the light emitted by the LEDs light. In the present embodiment, the two lenses 5, 6 are directly adjacent to each other, so that the distribution of the light emitted by the LEDs 2 and which passes from the LEDs 2 to the inside of the reflector 3, can be given particularly advantageous and comprehensive. The in the FIGS. 1 and 2 The optical elements (lenses 5, 6, group reflector 4) represented in other examples can be combined individually or together with other optical elements to form an optical system.

As described in the in Fig. 2 illustrated embodiment, two lenses 5, 6 are provided. The lenses 5, 6 form a lens system for ensuring the described Lichtleitcharakteristik. In particular, it is advantageous that the lens system has an asymmetrical refraction property in order to achieve the described and in particular in Figure 2c apparent effect with the corresponding light deflection of the emitted from the LEDs To achieve light. The provision of such a lens system comprising a plurality of, in particular two separate, in particular concentric, mutually arranged lenses 5, 6 may be particularly advantageous if between the lenses 5, 6 a plurality of LEDs along the direction of the distance between the lenses 5, 6 are provided this particular allow a particularly cost-effective design of the lens system and at the same time can ensure a comprehensive light transmission of light emitted by all LEDs at very low light intensity losses. However, it may also be advantageous to form the lens system as a unitary lens. This can in particular make possible a simple construction and a simple installation of the lens system if only one or a few LEDs are arranged along the radius of the reflector on the illuminant carrier 1, since then this one, uniform lens can be placed directly on the LEDs. The unitary lens may then preferably alone represent the lens system having the above-described advantageous light-guiding properties.

In FIG. 3 an arrangement comprising heat conducting body 8, LEDs 2 and light source carrier 1 is shown. The light source carrier 1 comprises a circuit board 101, on which the LEDs 2 are arranged directly, and via which the LEDs 2 are electrically contacted, and a copper plate (Cu plate 10) which is connected to the heat conducting body 8. The Cu plate 10 thus represents a heat-conducting layer of the illuminant carrier 1, which ensures a very good heat conduction from the LEDs 2 to the heat-conducting body 8. Thus, the light source carrier itself is designed as a heat-conducting element and ensures heat dissipation from the LEDs 2 to the heat-conducting body 8. The heat-conducting body 8 is also made of copper in the present embodiment. The Cu plate 10 is welded to the heat conducting body 8. Accordingly, the illuminant carrier 1 with the heat-conducting body 8 according to the embodiment according to FIG. 3 rigidly connected. Heat can be dissipated from the LEDs 2 to the heat radiating element 7 via the heat conducting body 8, which is heat-conductively connected to the heat radiating element 7. A corresponding connection between heat conducting body 8 and Cu plate 10 is in FIG. 4 shown.

In FIG. 4 is a section of an embodiment of a surgical light according to the invention shown. Out FIG. 4 it can be seen that the light source carrier 1 is arranged directly on the heat conducting body 8. The illuminant carrier 1 comprises a Cu plate 10. The heat conduction body 8 is arranged along the optical axis 50 of the reflector 3. The illustrated surgical light according to the invention has a hood 11 which is connected to the surgical light housing. By way of a movement of the heat-conducting body 8, to which the illuminant carrier 1 is rigidly connected, the relative position of the illuminant carrier 1 relative to the reflector 3 along the optical axis 50 can be changed. In the described embodiment, a corresponding travel of 30 mm is possible. As a result, given a typical distance between the surgical light and the surgical field, a variation of the area illuminated in the surgical field can be made, which corresponds to a change of approximately 240 mm with respect to the diameter of the area. The reflector 3 is rigidly connected to the surgical light housing. The reflector 3 also has a recess in which the heat radiating element 7 is provided. The heat radiating element 7 is connected by a plurality of screws with the hood 11 heat-conducting. This ensures a heat radiation to the environment via the hood 11.

The heat radiating element 7 is thermally conductively connected to the heat conducting body 8. One is a copper band (Cu band 13) is provided as a heat conduction band, which connects the heat conducting body 8 with the radiating element 7 in a thermally conductive manner. Here, the Cu-band 13 is connected via a heat sink 12 which is rigidly connected to the heat-conducting body 8, with the heat-conducting body 8. About the arrangement of the heat sink 12, heat conduction body 8, Cu band 13 and heat radiating element 7 is in relation to a change in position of the heat conducting body 8 in a direction along the optical axis 50 flexible and simultaneously heat-conducting connection between the heat radiating element 7 and heat conducting body 8 guaranteed. Moreover, the heat conduction body 8 having the shape of a cylinder is slidably guided in a hollow cylindrical guide provided in the heat radiating member 7. This ensures, on the one hand, a further heat-conducting contact between the heat-conducting body 8 and the heat-radiating element 7, and, on the other hand, a very good guidance of the heat-conducting body 8, which is held both by a holder 23 at its first axial end and by the sliding guide in the heat-radiating element 7. The holder 23 is designed so that a stepless change in the position of the heat conducting body 8, and thus of the illuminant carrier 1, to the reflector 3 is possible. This is ensured in the present embodiment via a frictional connection of the holder 23 to the surgical light housing. Another common embodiment and installation situation of the holder 23, which also in the embodiment according to FIG. 4 can be used is in FIG. 5 shown.

With respect to the arrangement of LEDs 2, group reflector 4 and lens 5 is off FIG. 4 Obvious that both a lens 5 and a group reflector 4 are provided. As a result, it is possible, for example, to specify a specific, desired emission characteristic of the surgical light according to the invention. It has proven to be particularly beneficial pointed out, the optical element, comprising at least one lens and / or a group reflector, positionally fixed on the Leuchtmittleträger 1 to arrange, as in the embodiments in FIG. 5 and 6 the case is. Thereby, the position of the optical element to the bulbs is constant even with a change in the position of the illuminant carrier 1 to the reflector 3, which is advantageous for the homogeneous illumination with a corresponding change in position, and which allows a simple construction of the surgical light according to the invention.

In FIG. 5 is a section of another embodiment of the surgical light according to the invention shown. The embodiment according to FIG. 5 differs from the embodiment according to FIG. 4 in that two copper bands (Cu bands) 13 are provided so that a particularly good heat dissipation from the heat-conducting body 8 to the heat-radiating element 7 is ensured. Both Cu bands 13 are identical. The Cu bands 13 ensure a displacement of the heat conduction body 8 along the optical axis 50 relative to the reflector 3, wherein the Cu bands 13 are formed so that a displacement within the in FIG. 4 and FIG. 5 each shown sliding guide of the heat conducting body 8 in the heat radiating element 7 is possible. In addition, in the embodiment according to FIG. 5 the holder 23 is guided via a guide ring 14 to the cover plate 9. The guide ring 14 is fixed in a fixed position on the cover plate 9. In addition, the holder 23 is a rotatable handle, which is rotatably mounted in the guide ring 14. Furthermore, the holder 23 has a thread 15 which corresponds to a thread provided in the heat conduction 8, so that a screwing along the thread 15, a change in the position of the heat conduction body 8 along the optical axis 50 to the reflector 3 can be realized. In this case, the screwing can be realized via a rotation of the holder 23, which is rotatably mounted in the guide ring 14 and thus rotatably to the cover plate 9.

As well in FIG. 4 as well as in FIG. 5 the reflector 3 is in each case rigidly connected to the hood 11 and thus to the surgical lamp housing. A change in the relative position of the illuminant carrier 1 to the reflector 3 thus takes place exclusively via the holder 23, with which the position of the heat conducting body 8 relative to the reflector 3 is variable. In the FIGS. 6 and 7 In principle representations arrangements are shown, which allow a relative change in the position of the illuminant carrier 1 to the reflector 3, characterized in that the reflector 3 relative to the surgical lamp housing changes its position, while the illuminant carrier 1 maintains its relative position to the surgical lamp housing.

Out FIG. 6 It can be seen that according to one embodiment, a motor 16 is provided for this purpose, which drives a bolt 18 which has a thread. The reflector 3 is designed so that it has a flange 30 which faces the outside of the reflector 3. In the flange 30, a recess is provided, in which a nut 17 is arranged. In FIG. 6 schematically is a cross section of an arrangement comprising motor 16, reflector 3, bolt 18 and nut 17 shown. The motor 16 is anchored stationary to the surgical light housing. By the motor 16 drives the bolt 18 which rotates in the nut 17, the position of the reflector 3 can be changed to the operating light housing. In another embodiment, not shown, the change in position, for example, by the interaction of a driven by the motor 16 screw with a arranged on the reflector 3 rack.

In FIG. 7 is a detailed illustration of an arrangement shown in accordance with the FIG. 6 described principle works. In Figure 7a a cross section of such an arrangement is shown schematically. Here are in Figure 7a only the reflector 3 and other components are shown, which ensure the support of the reflector 3 and the mobility of the reflector 3 to the surgical light housing along the optical axis 50 of the reflector 3. Other elements of an operating room light according to the invention are in Figure 7a not shown. In the embodiment according to Figure 7a the support of the reflector 3 is ensured via a support ring 20 which is rigidly connected to the surgical light housing. The support ring 20 is annular and has a rectangular cross section and is hollow inside. On the support ring 20, two electric motors 16 are arranged, which are arranged symmetrically with respect to the optical axis 50 of the reflector 3 to each other. The motors 16 have a flange, via which the motors are respectively attached to the support ring 20. The motors 16 each have a connecting piece 19, with which the motors 16 are each connected to a bolt 18. The connector 19 corresponds to the motor shaft of the associated motor 16. The bolt 18 can each rotate in a nut 17 which is fixedly connected to the flange 30 of the reflector 3.

Through the use of two motors 16, which are arranged symmetrically to the optical axis 50 of the reflector 3, tilting and jamming of the reflector 3 during the change in position of the reflector 3 to the surgical lamp housing along the optical axis 50 can be avoided. In the described advantageous embodiment, the guide pins 21 also contribute to this. The positions of the guide pins 21 which are in Figure 7a are shown in cross section are in FIG. 7b seen. The guide pins 21 are disposed on the guide pin positions 100 on the support ring 20. The guide pins 21 are in the flange 30 of the reflector slidably mounted on plain bearings 22. In the plain bearings 22, the guide pins 21 can be slidably moved along the optical axis 50. About the guide pins 21 it is ensured that the reflector 3 via the two motors 16, which are arranged on the motor positions 200 on the support ring 20 can be moved without tilting and stably stored and held. Out FIG. 7b it can be seen that for this purpose four guide pins are arranged, wherein the arrangement of the four guide pins 21 relative to the straight line, which is defined by the centers of the motor position 200, is mirror-symmetrical, with said straight line as a mirror line. This is particularly advantageous for the good guidance of the reflector 3 during a change in position of the reflector 3 along the optical axis 50. In other embodiments, not shown, an even greater number of guide pins 21 may be provided for an even better guidance of the reflector.

LIST OF REFERENCE NUMBERS

1

Lamp support

2

LED

3

reflector

4

group reflector

5

lens

6

lens

7

heat radiating

8th

thermal conductors

9

lens

10

Cu plate

11

Hood

12

heatsink

13

Cu strip

14

guide ring

15

thread

16

engine

17

mother

18

bolt

19

joint

20

support ring

21

guide pin

22

bearings

23

bracket

30

flange

50

optical axis

100

Guide pin position

101

circuit board

200

motor position

Claims (15)

1. Surgical lamp, comprising a lamp housing via which the surgical lamp can be mounted to an external element, an illuminant carrier (1) where several illuminants, in particular LEDs (2) or OLEDs, are disposed, and a reflector (3) having a light incident side and an optical axis (50) and configured for reflecting light impinging on the reflector (3) on the light incident side at the light incident side while focusing the light towards the optical axis (50), wherein the illuminant carrier (1) is disposed on the light incident side of the reflector (3), wherein the relative position of the illuminant carrier (1) to the reflector is variable, wherein the illuminant carrier (1) is connected to a heat radiating element (7) in a heat-conducting manner, wherein the heat radiating element (7) is disposed on the end of the reflector (3) opposite the light incident side,
   characterized in that
   the illuminant carrier (1) has a section extending over an area extending perpendicularly to the optical axis (50) of the reflector (3), wherein the illuminants are distributed over the surface of said flat section.
2. Surgical lamp according to claim 1,
   characterized in that
   the surgical lamp comprises an optical system (4, 5, 6) disposed between the illuminants (2) and the reflector (3).
3. Surgical lamp according to one of the preceding claims,
   characterized in that
   the surgical lamp comprises a closing disc (9) on the end of the reflector (3) situated on the light incident side.
4. Surgical lamp according to one of the preceding claims,
   characterized in that
   the illuminants (2) are arranged according to the shape of a ring through the center of which the optical axis (50) extends, in particular according to the shape of several rings concentric with the optical axis (50) as the center.
5. Surgical lamp according to one of the preceding claims,
   characterized in that
   the illuminant carrier (1) is formed as a heat-conducting element.
6. Surgical lamp according to one of the preceding claims,
   characterized in that
   the illuminant carrier (1) is connected to a heat-conducting body (8), wherein said heat-conducting body (8) is connected to the heat radiating element (7) in a heat-conducting manner.
7. Surgical lamp according to claim 6,
   characterized in that
   the heating-conducting body (8) extends parallel to the optical axis (50) of the reflector (3).
8. Surgical lamp according to one of the claims 6 or 7,
   characterized in that
   the surgical lamp comprises a heat sink (12) disposed on the heat-conducting body (8) and connected to the heat radiating element (7) in a heat-conducting manner.
9. Surgical lamp according to one of the claims 6 to 8,
   characterized in that
   the heat-conducting body (8) is connected to the heat radiating element (7) via a heat-conducting tape (13).
10. Surgical lamp according to one of the claims 6 to 9,
    characterized in that
    the illuminant carrier (1) is rigidly connected to the heat-conducting body (8), wherein the relative position of the heat-conducting body (8) to the reflector (3) is variable by changing the position of the heat-conducting body (8) relative to the surgical lamp housing while the position of the reflector (3) relative to the surgical lamp housing remains unchanged.
11. Surgical lamp according to one of the preceding claims,
    characterized in that
    the relative position of the illuminant carrier (1) to the reflector (3) is variable by changing the position of the reflector (3) relative to the surgical lamp housing while the position of the illuminant carrier (1) to the surgical lamp housing remains unchanged.
12. Surgical lamp according to claim 11,
    characterized in that
    the reflector (3) is guided via guide pins that extend parallel to the optical axis (50).
13. Surgical lamp according to claim 11 or 12,
    characterized in that
    the surgical lamp comprises at least one electric motor (16), in particular two electric motors (16) arranged symmetrically with each other with respect to the optical axis (50), for displacing the reflector (3) parallel to the optical axis (50).
14. Surgical lamp according to claim 13,
    characterized in that
    the surgical lamp comprises a supporting ring (20) through the center of which the optical axis (50) extends and on which at least one electric motor (16) is arranged.
15. Surgical lamp according to one of the claims 6 to 10 and in particular according to one of the claims 11 to 14,
    characterized in that
    the relative position of the illuminant carrier (1) to the reflector (3) is variable by changing the position of the reflector (3) relative to the surgical lamp housing and by changing the position of the heat-conducting body (8) relative to the surgical lamp housing.

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