DE102023107554A1 - Medical lamp with freeform lens - Google Patents

Abstract

A medical lamp (100) is disclosed having a light source (112) and a lens arrangement, wherein the lens arrangement has a primary lens (122) and a secondary lens (132) which are arranged one behind the other in a main beam direction (200), wherein the medical lamp (100) further has an adjustment mechanism (140) which is adjustable between a first position (301) and a second position and with which the primary lens (122) can be displaced along the main beam direction (200) for setting a light field (210) between the light source (112) and the secondary lens (132), and wherein the primary lens (122) is designed as a free-form lens.

Description

Field of the invention

The invention relates to a medical lamp with a freeform lens.

State of the art

Medical lights are known from the state of the art and contain, among other things, a light source. They are suitable for medical applications, for example for illuminating an operating field, for diagnostic purposes and for treatments in the field of veterinary medicine. A disadvantage of known medical lights is a low depth of illumination, i.e. that the light field generated by the medical light can only be displayed as desired within a narrow distance range from the medical light. Outside of this distance range, for example, undesirable shadows occur, the lighting intensity decreases and/or the edges of the light field become blurred. The medical light must therefore be repeatedly readjusted during use as the distance between the medical light and the object to be illuminated changes in order to ensure the required lighting quality. Such applications include, for example, operations on the abdominal area of a patient, in which the abdominal wall is first opened (laparotomy) and then the operation continues to penetrate further and further into the abdominal cavity. Another disadvantage of known medical lights is that the light field geometry can only be adjusted to a limited extent or with great effort. For example, the medical light must be moved as a whole in order to change the size of the light field or to avoid shadows in an area to be illuminated (particularly when medical personnel are working in the light field). In addition, in order to provide this functionality, the medical lights are mounted on complex articulated arms that limit the range of movement of the medical personnel and increase the cost of the medical light. In addition, the precise adjustment of the light field is difficult because the articulated arm cannot be adjusted as desired and the medical light cannot be moved to any position due to space constraints, e.g. because the space is needed to carry out a medical operation. In addition, known medical lights have the disadvantage that the light field generated has a radially different illumination intensity, in that the light field has a high illumination intensity in the inner area, which decreases towards the outside. The resulting uneven illumination makes applications in which color and/or brightness differences in the area to be illuminated have to be assessed, e.g. in the case of skin diseases, particularly difficult.

Freeform optics or lenses are also known from the state of the art as lenses whose external geometry deviates from the geometry of classic lenses, i.e. lenses that do not have completely concave and/or convex and rotationally symmetrical external contours. Such freeform lenses can, for example, have a concave and a convex area on a single lens side at the same time. Freeform lenses can be used, for example, for the collimation of light, for beam shaping, for images and for complex light distributions. Freeform lenses can thus be used to even out the lighting intensity within the light field. However, there are other applications in which a lighting intensity that decreases radially outwards is desired. For this purpose, the freeform lens could be designed to be interchangeable with a classic lens, although this would increase construction costs and volume. In addition, such a medical lamp would still be limited to the two lighting situations. With the targeted design of freeform lenses, a desired power density distribution can be achieved while simultaneously maximizing the usable light output with a minimum number of optical surfaces. Freeform lenses are no longer necessarily designed according to the concepts of imaging optics. Instead, the aim is to redistribute power through light refraction and, if necessary, reflection.

State-of-the-art solutions are therefore expensive, difficult to operate, do not allow precise and variable adjustment of the light field and require a lot of space, energy and weight.

Description of the invention

The object of the present invention is therefore to overcome the problems known from the prior art, i.e. to provide a cost-effective, easy-to-use, precisely and variably adjustable, small, energy-efficient and lightweight solution.

The object is achieved by a medical lamp according to patent claim 1. Further features embodying the invention are contained in the dependent patent claims.

A medical lamp according to the invention has a light source and a lens arrangement, wherein the lens arrangement has a primary lens and a secondary lens which are arranged one behind the other in a main beam direction, wherein the medical lamp further comprises an adjustment mechanism which is adjustable between a first position and a second position and with which the primary lens can be displaced along the main beam direction for setting a light field between the light source and the secondary lens, and wherein the primary lens is designed as a free-form lens.

A freeform lens is a lens that has a freeform surface on at least one side, for example on the side through which the light enters (incident side) and/or on the side through which the light exits the lens (exit side). A freeform surface is an outer contour that deviates from the completely concave and/or convex and rotationally symmetrical outer contour of classic optical lenses. Possible options include concave and/or convex lenses that are not rotationally symmetrical, and lenses that have at least one concave and one convex area on one side. If light falls into such a freeform lens, the light is refracted in different ways depending on the specific position of incidence and the specific angle of incidence. Light that falls at a certain angle and enters a convex area of the freeform lens can be refracted towards the main optical axis of the freeform lens - the freeform lens therefore functions as a converging lens in this area. If the light enters a concave area of the primary lens at this particular angle, the light is refracted away from the main optical axis of the freeform lens - the freeform lens functions as a scattering lens in this area. In addition, the freeform lens can have areas that refract the incident light in a parallel manner - the freeform lens functions as a spotlight lens or collimation lens in this area - and areas that allow the light to pass through unrefracted.

The main optical axis is the axis that has the smallest average distance to the optical axes of the different lens areas defined by the freeform lens or the optical axis itself if the freeform lens only has one optical axis. The main optical axis runs perpendicular to the lens plane and through the center of gravity of the freeform lens if this is rotationally symmetrical. The main optical axis can also run obliquely to the lens plane, i.e. at an angle that is less than 90° and/or acentrically, i.e. away from the center of gravity of the freeform lens.

By using a freeform lens, scattered radiation and stray light can be eliminated more effectively, which can improve the quality of the lighting. In addition, by using a freeform lens, a light field cylinder can be created, which can improve the depth of illumination, so that the surgical light does not need to be adjusted as often as the distance between the area to be illuminated and the medical light changes. This can improve the handling of the medical light.

According to the invention, the medical lamp is designed to allow the light to fall into different areas of the freeform lens depending on the distance of the freeform lens from the light source, i.e. by varying the distance of the freeform lens from the light source, the specific lens area into which the light emitted by the light source falls into the freeform lens can be varied and thus different light refraction behavior can be generated in a variably adjustable proportion. For example, the medical lamp can be designed to primarily illuminate light-collecting areas of the freeform lens when the freeform lens is close to the light source, so that a light field with a small diameter results, and to primarily illuminate light-diffracting areas of the freeform lens when the freeform lens is far from the light source, so that a light field with a large diameter results. In this way, desired lighting characteristics can be set depending on the application, which on the one hand results in a high variability of the medical lamp and on the other hand in a low space and energy requirement.

The light field is adjusted in an area that has a preferred, defined distance from the medical lamp, for example a distance in a range of 0.5-2.5 m, particularly preferably 1 m, such that a diameter, a geometry and/or an illumination intensity profile of the light field is adjusted. The distance between the medical lamp and the light field is the distance from the part of the medical lamp closest to the light field, for example a protective element, to the light field itself or to the focal point or area. The light field is adjusted by offsetting the primary lens using the adjustment mechanism relative to the light source.

Preferably, the freeform lens has freeform surfaces on both sides of the lens, i.e. on the incident and exit sides. In this way, the number of adjustable lighting characteristics and thus the variability of the medical lamp can be increased.

Preferably, the primary lens is designed or arranged in such a way that the light rays incident from the direction of the light source enter and exit the secondary lens over a large area of the lens. Accordingly, the secondary lens appears to be at least largely illuminated and the shadows cast by objects located below the medical lamp are reduced. In this way, the lighting quality of the medical lamp can be improved.

Preferably, the diameter of the light field is adjustable in the range of 2-100 cm, particularly preferably in the range of 4-70 cm, even more preferably in the range of 6-40 cm. In this way, the relevant area, e.g. the operation or examination area, can be precisely illuminated depending on the requirements.

Preferably, the geometry of the light field can be adjusted from elliptical to triangular to polygonal.

Preferably, the primary lens has a freeform surface on both sides of the lens, i.e. on the side through which the light enters and on the side through which the light exits the lens. In this way, the number or variability of the adjustable light field configurations can be increased.

Preferably, the medical lamp further comprises at least one further light source and a further primary lens for each further light source, wherein a respective optical radius of the primary lenses is smaller than an optical radius of the secondary lens, and wherein a light source and a primary lens are arranged one behind the other in the main beam direction. Each of the further primary lenses is also designed as a free-form lens. In this way, the illumination intensity in the light field can be increased. Preferably, a primary lens is assigned to each light source.

For example, the medical lamp can have up to 20, up to 60, up to 100 or even up to 200 light sources and primary lenses.

Preferably, the secondary lens is designed as a free-form lens. In this way, the number or variability of the adjustable light field configurations can be increased. What has been described above with regard to free-form lenses applies analogously to the secondary lens designed as a free-form lens.

Preferably, the lens arrangement is designed to generate a light field with an illumination intensity that is essentially constant in the radial direction in the first position. In this way, uniform illumination of the light field can be achieved. The radial direction is understood to be a direction pointing outwards from the center of the light field, regardless of the actual outline of the light field. The light field is therefore not limited to actually circular shapes, but can also be elliptical or polygonal, for example. Such a light field can have a high plateau with a uniform brightness level and steeply sloping edges in relation to the illumination intensity. In this way, a light field that is optimal for medical applications can be generated.

Preferably, the lens arrangement is designed to generate a light field with a decreasing illumination intensity in the radial direction in the second position. This makes it possible to implement a further illumination characteristic, whereby the variability of the medical lamp can be increased.

Preferably, the lens arrangement is designed to generate a light field in the second position with a decreasing illumination intensity from the inside to the outside, for example such that the course of the illumination intensity from the center of the light field to the outside resembles a Gaussian curve. In this way, a further light field configuration can be implemented that is very well suited for areas to be examined with small relevant objects, whereby the variability of the medical lamp can be increased.

Preferably, the adjustment mechanism is also adjustable to a third position, wherein the lens arrangement is designed to generate a light field with a different geometry in the third position than in the first position and/or second position. A different geometry is understood to mean a deviation from the specific dimensions of the light field in the first and/or second position, for example a different size, i.e. the light field of the third position is smaller or larger than the light field of the first or second position, or a different geometry, i.e. the light field of the third position is, for example, elliptical or square and circular in the first or second position. In this way, the variability of the medical lamp can be increased.

Preferably, the lens arrangement is designed to generate a light field of a different size in the third position than in the first position and/or second position. In this way, the variability of the medical lamp can be increased.

Preferably, the lens arrangement is designed to generate a light field with a different geometry in the third position than in the first position and/or second position. In this way, the variability of the medical lamp can be increased.

Preferably, the adjustment mechanism is continuous between the first position and the second position and optionally the third position. nuously adjustable. In this way, intermediate positions between the first and second position and, if necessary, the third position can be set, thereby increasing the variability and precision of the adjustability of the medical lamp.

Preferably, the medical lamp further comprises an opaque shielding device arranged parallel to the main beam direction. This can prevent the light from accidentally escaping from the predetermined light area, particularly when using multiple secondary lenses and light sources. In this way, the lighting quality of the light field can be improved. The predetermined light area is determined for each light source in the medical lamp. If the light source emits light in a beam cone, the area of the light incident on the primary lens depends on the distance of the light source from the primary lens. In certain configurations of the medical lamp, particularly when the primary lens is far away from the light source and without using a shielding device, it can happen that light is emitted past the primary lens. In this case, light can accidentally enter other primary lenses or exit directly from the medical lamp, which on the one hand results in illuminated areas away from the light field and on the other hand reduces the lighting quality in this field.

If several light sources are provided, the medical lamp preferably has at least one shielding device for each light source.

Preferably, each light source is individually shielded with a shielding device. In this way, the illumination quality of the light field can be improved. If necessary, a single shielding device can be used for several adjacent light sources, which can reduce construction costs.

The shielding device is preferably telescopic, the shielding device being coupled to the first adjustment mechanism in such a way that the shielding device is retracted when the primary lens is offset in the direction of the light source and is extended when the primary lens is offset in the direction of the secondary lens. In this way, the adjustability of the medical lamp can be improved and it can be ensured that no open gap results in the shielding device in certain configurations of the medical lamp. In this way, the lighting quality of the medical lamp can be improved. Telescopic means that the shielding device can be extended and retracted, in particular linearly along the main beam direction.

The shielding device can be coupled to the first adjustment mechanism by connecting it to the primary lens or the primary lens board. If the shielding device is also connected to the light source, the shielding device can be telescoped by simply moving the first adjustment mechanism. This means that no separate drive or actuating device is required for the shielding device, which on the one hand reduces construction costs and on the other hand simplifies handling.

The light source is preferably an LED. This reduces the space and energy requirements of the medical lamp.

Preferably, the light source has a radiation characteristic in the range of 60° to 120°, i.e. a radiation cone opens along the main beam direction of the light source, between the outer edge of which and a plane perpendicular to the main beam direction an angle of 60° or 120° is formed. Accordingly, an angle of 30° is formed between the main beam direction and the outer edge of the radiation cone. In this way, the illumination uniformity of the light field can be increased.

Preferably, a main plane of the primary lens runs parallel to a main plane of the secondary lens. In this way, the necessary installation space of the medical lamp can be further reduced, particularly in the case of flat lenses.

Preferably, the light sources are dimmable. This allows the lighting intensity of the light field to be adjusted as required.

Preferably, the primary lenses are arranged in a common primary lens plane that runs perpendicular to the main beam direction. In this way, the space requirement can be further reduced.

Preferably, the primary lenses are arranged such that their main planes are congruent. This allows the space requirement to be further reduced.

Preferably, the light source has at least two light-emitting diodes, wherein the two light-emitting diodes can be operated with different light colors. In this way, the light color can be adjusted as required, for example to achieve a high contrast effect, whereby the lighting quality of the light field can be improved.

Short description of the characters

• 1a shows a medical lamp in a side, abstract view in a first position.
• 1b shows a diagram of the lighting intensity to the 1a shown medical lamp.
• 2a shows the 1a Medical lamp shown in a side, abstract view in an intermediate position.
• 2b shows a diagram of the lighting intensity to the 2a shown medical lamp.
• 3a shows the 1a and 2a shown medical lamp in a side, abstract view in a second position.
• 3b shows a diagram of the lighting intensity to the 3a shown medical lamp.
• 4a to 4f show different light fields.
• 5a shows another medical lamp in a side, abstract view.
• 5b shows another medical lamp in a side, abstract view.

Description of the preferred embodiments

1a shows a medical lamp 100 in a side, abstract view in a first position 301. The medical lamp 100 has a light source board 110 on which a plurality of light sources 112 are arranged. The light source board 110 increases the robustness of the medical lamp 100 by holding the light sources 112 securely by means of the light source board 110. However, the light sources 112 can also be provided in the medical lamp 100 without a light source board 110. The medical lamp 100 also has a primary lens board 120 on which a plurality of primary lenses 122 are arranged. The primary lens board 120 increases the robustness of the medical lamp 100 by holding the primary lenses 122 securely by means of the primary lens board 120. The primary lenses 122 can, however, also be provided in the medical lamp 100 without a primary lens board 120. The primary lens board 120 runs essentially along a primary lens plane common to the primary lenses 122. The primary lenses 122 are each arranged below a light source 112. The medical lamp 100 also has a secondary lens 132 and an adjustment mechanism 140. The primary lens board 120 is attached to the adjustment mechanism 140 and can be adjusted by means of the latter. The light source board 110, the primary lens board 120 and the secondary lens 132 are arranged one behind the other along a main beam direction 200, with the light source board 110, the primary lens board 120 and the secondary lens 132 each being arranged parallel to one another and perpendicular to the main beam direction 200. By means of the adjustment mechanism 140, the primary lens board 120 can be displaced parallel to the main beam direction 200 along a first displacement direction 202 towards the light source board 110 and parallel to the main beam direction 200 along a second displacement direction 204 towards the secondary lens 132. The adjustment mechanism 140 can be designed purely mechanically, whereby a cost-effective solution can be provided, or with an additional servo motor, whereby a precisely adjustable and possibly automatically controllable solution can be provided. The adjustment mechanism 140 can also have additional guide elements, for example on the side opposite the fastening of the primary lens board 120, whereby more precise guidance and thus more precise adjustability can be made possible. The medical lamp 100 further comprises a housing 150 in which the functional components are housed, in particular the light source board 110 with the light sources 112, the primary lens board 120 with the primary lenses 122, the secondary lens 132 and the adjustment mechanism 140. Both the primary lenses 122 and the secondary lens 132 are designed as free-form lenses and each have free-form surfaces on their incident sides and exit sides. The free-form surfaces each have several concave and several convex areas that are arranged alternately. In 1a the beam path of the medical lamp 100 is also shown. To maintain clarity, only a portion of the light rays is shown. The light sources 112 each emit a light cone 114 that opens in the direction of the primary lens 122 arranged below the light source 112. The light is bundled in the respective primary lens 122, whereby in the configuration shown the light rays form a light cylinder with parallel but also with light rays that are oblique to one another. The light sources 112 each emit a light cone 114 that opens in the direction of the primary lens 122 arranged below the light source 112. 1a The medical lamp 100 shown further comprises a plurality of shielding devices 180, wherein in 1a to maintain clarity, only a portion of the shielding devices 180 are provided with reference numerals. The shielding devices 180 are arranged parallel to the main beam direction 200. If the light cones 114 emitted by the light sources 112 impinge on the shielding devices 180 arranged directly next to the light sources 112 in the edge region, the corresponding light rays are prevented from passing through the

Shielding devices 180 are prevented. On the one hand, this prevents the light from escaping directly from the medical lamp 100 or from its housing 150 (see in particular the external shielding devices 180). On the other hand, this prevents the light emitted by a light source 112 from entering a primary lens 122 not associated with this light source 112. The shielding devices 180 are also preferably designed to be reflective, whereby the angle of incidence of a portion of the light entering the primary lenses 122 can be changed, in particular when the primary lenses 122 are far away from the light sources 112. In addition, this can increase the efficiency of the medical lamp 100, since no light is absorbed by the shielding devices 180. The reflected light then falls into the primary lens 122, for example, in the same way that it would fall into the primary lens 122 if emitted by an adjacent light source 112 if no shielding device 180 were present. In this way, further light field configurations can be generated, whereby the variability of the medical lamp 100 can be increased. Preferably, the shielding devices 180 are only partially reflective, so that reflection only occurs from a certain distance between the primary lenses 122 and the light source board 110. If the shielding devices 180 are designed to be telescopic, the areas that are only exposed when telescoped out are particularly preferably designed to be reflective. In this way, the reliability and the lighting quality of the medical lamp 100 can be increased.

1b shows a diagram 400 of the illumination intensity to the 1a illustrated medical lamp 100. The diagram 400 has a first axis 410 and a second axis 420. The first axis 410 corresponds to the diameter of the light field 210 and the second axis 420 to the illumination intensity. The course of the illumination intensity is shown as a graph 430. A first diameter 411 and a second diameter 412 are shown on the first axis 410, which are each assigned to a first illumination intensity 421 and a second illumination intensity 422. A maximum illumination intensity 423 is also shown on the second axis 420, which occurs at a diameter of zero, ie in the center of the light field 210. The first illumination intensity 421 is 50% and the second illumination intensity 422 is 10%. Starting from the center of the light field 210, i.e. starting from the maximum illumination intensity 423 in the direction of increasing diameter, the illumination intensity decreases minimally, i.e. it essentially remains on a plateau. The plateau ends abruptly immediately before the first diameter 411, whereupon the illumination intensity drops steeply. The distance from the first diameter 411, i.e. 50% illumination intensity, to the second diameter 412, i.e. 10% illumination intensity, is significantly smaller than the distance from the first diameter 411 to the center of the light field 210. The light field 210, whose illumination intensity increases over the diameter in 1b is shown is a light field 210 that is very well suited for medical applications, since this light field 210 has an almost constant illumination intensity over the diameter and steeply sloping edges. Preferably, the illumination intensity of such a light field 210 is in the range of 20,000-500,000 lux, particularly preferably in the range of 50,000-250,000 lux and even more preferably in the range of 100,000-200,000 lux, e.g. 160,000 lux. In this way, optimal illumination can be achieved for medical applications.

2a shows the 1a illustrated medical lamp 100 in a lateral, abstract view in an intermediate position 304. The intermediate position 304 corresponds to a position of the primary lens board 120 between the first position 301 (cf. 1a) and the second position 302 (cf. 3a) In the illustrated intermediate position 304, the primary lens board 120 is further away from the light source board 110 than in the first position 301.

2b shows a diagram 400 of the illumination intensity to the 2a Medical lamp 100 shown in 2b The axes, diameters and illumination intensities shown in the diagram 400 correspond to those shown in the diagram 400 of the 1b equivalents shown. Just as in 1b Graph 430 shows the course of the illumination intensity. The 2b Graph 430 shown differs from that in 1b shown graph 430 insofar as the 2b The graph 430 shown does not have a pronounced plateau, but rather the illumination intensity decreases more and more with increasing diameter, with a turning point in the areas of the first diameter 411 and the second diameter 412. The first diameter 411 of the 2b The graph 430 shown is located closer to the center of the light field 210 than that of the graph shown in 1b shown graph 430 and accordingly also further away from the second diameter 412.

3a shows the 1a and 2a illustrated medical lamp 100 in a side, abstract view in a second position 302. In the illustrated second position 302, the primary lens board 120 is further away from the light source board 110 than in the first position 301 (cf. 1a) and the in 2a shown intermediate position 304.

3b shows a diagram 400 of the illumination intensity to the 3a Medical lamp 100 shown in 3b The axes, diameters and illumination intensities shown in diagram 400 correspond to those shown in diagrams 400 of the 1b and 2b equivalents shown. Just as in the 1b and 2b Graph 430 shows the course of the illumination intensity. The 3b Graph 430 shown differs from that in 1b shown graph 430 insofar as the 2b The graph 430 shown does not have a pronounced plateau, but rather is accompanied by an increasingly stronger decreasing illumination intensity with increasing diameter, with a turning point only being present in the area of the first diameter 411. The first diameter 411 of the 2b The graph 430 shown is located closer to the center of the light field 210 than that of the graph shown in the 1b and 2b shown graph 430 and accordingly also further away from the second diameter 412. The 3b Graph 430 shown here resembles a Gaussian curve. The 2b Graph 430 shows the proportions of the 1b and 3b shown graph 430, wherein the portion of the plateau-like graph 430 (cf. 1b) can be increased by positioning the primary lens board 120 closer to the first position 301, while the portion of the Gaussian-like graph 430 (cf. 3b) can be increased by positioning the primary lens board 120 closer to the second position 302.

The 4a to 4f show different light fields 210. 4a a circular light field 210, 4b an elliptical, 4c a triangular, 4d a square, 4e a pentagonal and 4f a hexagonal one. Other light field geometries are also possible, e.g. combinations of the 4a to 4f illustrated light fields 210, light fields 210 with more than six corners and light fields 210 with straight and curved outline sections. Preferably, in order to generate the aforementioned light fields 210 and to switch between them, the medical lamp 100 or the adjustment mechanism 140 is further configured to be adjusted to a third position in which a light field geometry deviating from the light field geometry of the first position 301 and second position 302 results. For example, in this way, the circular light field geometry pronounced in the first position 301 and second position 302 (cf. 4a) the light field 210 can be transformed into a quadrangular light field geometry (cf. 4d ). It is also possible that in the third position, not a different light field geometry or light field configuration results, but a similar light field geometry but with different dimensions, e.g. a smaller or a larger light field 210. Compared to solutions known from the prior art, this results in the advantage that in order to adjust the light field size, the entire medical light 100 does not have to be moved, but rather the medical light 100 can remain in its original position, whereby the handling of the medical light 100 can be improved.

5a shows another medical lamp 100 in a side, abstract view. The 5a The medical lamp 100 shown in the drawing has, unlike the 1a , 2a and 3a The medical lamp 100 shown in Figure 1 does not have any shielding devices 180. A 5a The medical lamp 100 shown has a smaller number of necessary components than the ones shown in the 1a , 2a and 3a illustrated medical lamp 100, which can reduce costs, although the lighting quality is also potentially reduced.

5b shows another medical lamp 100 in a side, abstract view. The 5b The medical lamp 100 shown in Figure 1 has, like the 5a The medical lamp 100 shown in FIG. 1 has no shielding devices 180. In addition, the 5b Medical lamp 100 shown is different from the one shown in the 1a , 2a , 3a and 5a The medical lights 100 shown in the drawings have only a single light source 112, which has a larger beam cone than the light source shown in the 1a , 2a , 3a and 5a shown light sources 112 (see the shape of the light cone 114). A light source as shown in 5b The medical lamp 100 shown has a smaller number of necessary components than the ones shown in the 1a , 2a , 3a and 5a illustrated medical lights 100, which can reduce costs, although the lighting quality is also potentially reduced.

List of reference symbols

100

Medical lamp

110

Light source board

112

Light source

114

Light cone

120

Primary lens board

122

Primary lens

132

Secondary lens

140

Adjustment mechanism

150

Housing

180

Shielding device

200

Main beam direction

202

first offset direction

204

second displacement direction

210

Light field

301

first position

302

second position

304

Intermediate position

400

diagram

410

first axis

411

first diameter

412

second diameter

420

second axis

421

first lighting intensity

422

second lighting intensity

423

maximum lighting intensity

430

graph

Claims (10)

Medical lamp (100) having a light source (112) and a lens arrangement, wherein the lens arrangement has a primary lens (122) and a secondary lens (132) which are arranged one behind the other in a main beam direction (200), wherein the medical lamp (100) further has an adjustment mechanism (140) which is adjustable between a first position (301) and a second position (302), with which the primary lens (122) can be displaced along the main beam direction (200) for setting a light field (210) between the light source (112) and the secondary lens (132), and wherein the primary lens (122) is designed as a free-form lens. Medical lamp (100) by Claim 1 , further comprising at least one further light source (112) and for each further light source (112) a further primary lens (122), wherein a respective optical radius of the primary lenses (122) is smaller than an optical radius of the secondary lens (132), and wherein a light source (112) and a primary lens (122) are arranged one behind the other in the main beam direction (200). Medical lamp (100) according to one of the preceding claims, wherein the secondary lens (132) is designed as a free-form lens. Medical lamp (100) according to one of the preceding claims, wherein the lens arrangement is adapted to generate a light field (210) with a substantially constant illumination intensity in the radial direction in the first position (301). Medical lamp (100) according to one of the preceding claims, wherein the lens arrangement is adapted to generate a light field (210) with decreasing illumination intensity in the radial direction in the second position (302). Medical lamp (100) according to one of the preceding claims, wherein the adjustment mechanism (140) is further adjustable to a third position, wherein the lens arrangement is configured to generate a light field (210) with a different geometry in the third position than in the first position (301) and/or second position (302). Medical lamp (100) by Claim 6 , wherein the lens arrangement is adapted to generate a light field (210) of a different size in the third position than in the first position (301) and/or second position (302). Medical lamp (100) according to one of the Claims 6 or 7 , wherein the lens arrangement is adapted to generate a light field (210) with a different geometry in the third position than in the first position (301) and/or second position (302). Medical lamp (100) according to one of the preceding claims, wherein the adjustment mechanism (140) is continuously adjustable between the first position (301) and the second position (302) and optionally the third position. Medical lamp (100) according to one of the preceding claims, further comprising an opaque shielding device (180) arranged parallel to the main beam direction (200).

Images