Operating lamp structure
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- FARO FABRICA APPARECCHIATURE RAZIONALI ODONTOIATRICHE SPA
- Filing Date
- 2024-07-24
- Publication Date
- 2026-06-03
AI Technical Summary
Existing operating lamps require significant engineering and high production costs to meet specific requirements for light spot geometry, size, and intensity, often necessitating the use of existing lamps that only approximate the desired specifications.
An operating lamp structure featuring a light source, light guide, diffusing body, shutter body, and reflector, where the diffusing body and shutter body's passage opening are designed to define the light spot's geometry and size without modifying other components, allowing for quick and cost-effective adjustments to meet various application requirements.
This solution enables the production of operating lamps that can meet a wide range of specific requirements for light spot geometry and size with minimal modifications and reduced production costs, while maintaining even illuminance and constant light flux within the light spot.
Smart Images
Figure IB2024057159_30012025_PF_FP_ABST
Abstract
Description
[0001] Operating lamp structure
[0002] DESCRIPTION
[0003] The present invention relates to an operating lamp.
[0004] Operating lamps are usually used to illuminate, in a controlled way, operating fields in which an operator has to perform an operation.
[0005] An example of operating lamps is given by dental lamps, i.e. lamps used by dentists to illuminate a patient's oral cavity (operating field) during an operation.
[0006] Other examples of operating lamps are lamps used by surgeons, goldsmiths, in laboratories, and the like.
[0007] The main purpose of operating lamps is to create an illumination area at the operating field that is illuminated substantially evenly and having a predetermined geometry.
[0008] In particular, the illumination area, also called "spot" or "light spot", has defined characteristics depending on the application. For example, it may be necessary for the illumination area to have a circular, elliptical, rectangular or square geometry of a predetermined size within which the light flux produced by the lamp is more or less even.
[0009] In any case, the boundary between the illumination area of the operating lamp (which as mentioned corresponds to the operating field) and the environment surrounding the illumination area (illuminated by other natural or artificial light sources) must usually be clear and defined.
[0010] In the Applicant's experience, for each specific application which the operating lamp is intended for, it is necessary to engineer the operating lamp so that it meets the requirements in terms of geometry and size of the light spot.
[0011] In the Applicant's experience, it is possible to define a generic architecture of an operating lamp family, referring to the components and structure used to create the operating lamp, which can be used in a more or less broad range of specific applications, but it is, however, often necessary for each specific application to redefine the peculiarities, the relative positioning and the shape of the components and structure of the operating lamp.
[0012] For example, depending on the specific application, it is sometimes necessary to engineer a specific operating lamp from the same family of operating lamps by redefining the light source, the reflecting surface or surfaces of the lamp, any optical lenses placed along the optical path of the light emitted by the light source (as well as their relative position in relation to the light source) and still more.
[0013] In the Applicant's experience, this inevitably involves a high investment in the engineering of the specific lamp and a high production cost of the lamp itself.
[0014] Therefore, when dealing with a specific request from a user in terms of geometry and size of the light spot or in terms of light intensity of the light spot, the production cost of the operating lamp can be very high with the possible consequence that the user decides to use an operating lamp already existing on the market which approximates the most, but does not fully meet, the specific request.
[0015] The Applicant therefore felt the need to make available an operating lamp structure making it possible, with limited and quick modifications, to produce operating lamps capable of meeting a wide spectrum of specific requirements, preferably a wide spectrum of specific requirements in terms of geometries and size of the light spot.
[0016] The present invention therefore relates to an operating lamp structure comprising : a light source to emit light beams; a light guide having an inlet and an outlet for transmitting said light beams from the inlet to the outlet, wherein the inlet is directly facing said light source; a diffusing body placed in a predetermined zone and placed at the outlet of the light guide, wherein said light beams enter said diffusing body and wherein diffused light beams exit said diffusing body; a shutter body placed at said diffusing body and having a passage opening for said diffused light beams; a reflector having a reflecting surface with a shape corresponding to a portion of the surface of an ellipsoid to reflect said diffused light beams to a first focus of the ellipsoid; wherein a photometric solid created by said diffused beams exiting said diffusing body has a shape given by an emission substantially Lambertian; wherein said passage opening of the shutter body is facing the reflecting surface of the reflector and wherein said predetermined zone is placed at a second focus of said ellipsoid.
[0017] The Applicant considers that it is possible to define the geometry and size of the light spot in the above-mentioned operating lamp structure simply by choosing and using a specific shape of the diffusing body and a specific shape and size of the passage opening of the shutter body. This without having to modify the reflector, light source, light guide, or other components, and without having to redefine the relative positions between the various components of the operating lamp.
[0018] In fact, the Applicant has found that by choosing a diffusing body such that the photometric solid made by the diffused rays exiting the diffusing body has a shape given by a substantially Lambertian emission, and by placing this diffusing body in the optical path of a light source, the diffused light rays exiting the diffusing body follow paths having random directions. By arranging the diffusing body at the second focus of an ellipsoid, the reflecting surface (which has a shape corresponding to a portion of the surface of an ellipsoid) is evenly reached by diffused light rays. By placing the shutter body at the diffusing body, the only diffused light rays passing through the passage opening of the shutter body can reach the reflector and be reflected from it to the first focus of the ellipsoid. The light spot that is formed along the optical path followed by the light rays reflected by the reflector and at a predetermined distance from the second focus of the ellipsoid (e.g. at a distance of 700 millimetres from the second focus of the ellipsoid) has a shape and size that is directly proportional to the shape and size of the passage opening of the shutter body.
[0019] By choosing the shape and size of the passage opening of the shutter body (and by choosing a diffusing body with a suitable shape and size to allow only light rays diffused by the diffusing body to pass through the passage opening of the shutter body), it is therefore possible to choose and determine the shape and size of the light spot without having to redefine the other components of the operating lamp structure, thus saving money in the preparation of a lamp according to predetermined specifications. The fact that the light rays emitted by the light source are directed onto the diffusing body by the light guide allows to keep the light source in the same position regardless of the size of the shutter body and diffusing body chosen.
[0020] The term "light flux" refers to the amount, in a unit of time, of energy conveyed by an electromagnetic radiation field belonging to the visible light frequency spectrum.
[0021] The term "light beam" refers to a very thin beam of light used to describe geometrical characteristics of the light optical path.
[0022] The term "optical path" refers to the ideal path of light rays.
[0023] The term "light guide" refers to any device capable of conveying light radiation from an area close to a light source to another area distant from the first area, possibly with a reduction in light flux intensity. An optical fibre is an example of a light guide.
[0024] The term "photometric solid" refers to the three-dimensional geometric figure delimited by a surface formed by the locus of the extreme points of segments with lengths proportional to the light intensity of the light rays emitted by a body, e.g. the light rays exiting the diffusing body.
[0025] The term "Lambertian emission" refers to an emission of light rays from a body, e.g. an emission of light rays from the diffusing body, wherein the emitted rays follow trajectories similar to the trajectories followed by light rays incident on an ideal diffuser. An ideal diffuser is understood to be a diffuser that reflects light rays evenly in all directions in such a way that the apparent brightness for an observer is the same regardless of the observer's angle of view.
[0026] The term "optical element" refers to any body that can be passed through by light rays wherein, when light rays having parallel optical paths pass through said body, these optical paths are deflected, losing their parallelism. A lens is an example of an optical element. A panel or screen made of glass or other transparent material (i.e. allowing light rays to pass through it without macroscopically diffusive phenomena) is not an optical element.
[0027] The term "placed at" means placed in exactly the same position or otherwise placed at a distance lower than 0.5 centimetres.
[0028] The operating lamp structure of the present invention may comprise one or more of the following preferred features, taken individually or in combination.
[0029] Preferably, between said shutter body and the reflecting surface of the reflector, the lamp structure does not comprise any optical element.
[0030] Preferably, the diffused light rays exiting the diffusing body and passing through the through opening of the shutter body directly reach the reflecting surface of the reflector without being subjected to optical diffusing effects.
[0031] Preferably, the optical path of the diffused light rays exiting the diffusing body and passing through the through opening of the shutter body is not altered until reaching the reflecting surface of the reflector.
[0032] Preferably, the diffused light rays reaching the reflecting surface are completely reflected to the first focus of the ellipsoid.
[0033] Preferably, the operating lamp structure does not comprise any optical element placed along an optical path of the diffused light beams reflected by the reflecting surface of the reflector.
[0034] Preferably, the diffused light rays reflected from the reflecting surface are not subjected to additional optical diffusing effects.
[0035] Preferably, the optical path of diffused light rays reflected from the reflecting surface of the reflector is not altered by any optical lens.
[0036] Preferably, said shutter body is made of a material that is opaque to light.
[0037] Preferably, all the diffused light rays emitted by the diffusing body are directed towards the shutter body in such a way that the diffused light rays emitted by the diffusing body pass through the through opening of the shutter body or reach the opaque material of the shutter body.
[0038] Thus, the light rays diffused out of the diffusing body move away from the diffusing body only through the through opening of the shutter body.
[0039] Preferably, said diffusing body comprises an inner surface facing the light guide and an outer surface facing said shutter body.
[0040] Preferably, the outer surface of the diffusing body has substantially the same shape as the through opening of the shutter body.
[0041] Preferably, the outer surface of the diffusing body has substantially the same size as the through opening of the shutter body.
[0042] The Applicant has verified that in this way most of the diffused light rays emitted through the diffusing body pass through the through opening of the shutter body, avoiding significant reductions in the light flux passing through the diffusing body and not passing through the pass through opening of the shutter body.
[0043] Preferably, said shutter body comprises an upper wall on which said through opening is obtained.
[0044] Preferably, the through opening of the shutter body is delimited by an inner edge of the upper wall of the shutter body.
[0045] Preferably, said inner edge defines the shape and size of the through opening.
[0046] Preferably, the upper wall of the shutter body is superimposed on the outer surface of the diffusing body.
[0047] Preferably, the outer surface of the diffusing body is delimited by an outer edge.
[0048] Preferably, the outer edge of the diffusing body is placed below the upper wall of the shutter body and is not facing said through opening.
[0049] Preferably, a distance between the outer edge of the diffusing body and the inner edge of the upper wall of the shutter body is between 0.2 millimetres and 5 millimetres, preferably between 0.2 millimetres and 3 millimetres, preferably between 0.3 millimetres and 2 millimetres, e.g. it is approximately 0.5 millimetres.
[0050] Preferably, said reflecting surface of said reflector is a single, continuous surface.
[0051] Preferably, said reflecting surface of the reflector defines a trace on a plane of symmetry for said ellipsoid passing through the first and second focus.
[0052] The trace of the reflecting surface on said plane of symmetry is the intersection of the reflecting surface with said plane of symmetry.
[0053] Preferably, said trace is a curved line and has two end points. Preferably, two segments contained in said plane of symmetry join respectively the second focus of the ellipsoid to a first of said two end points of said trace and the second focus of the ellipsoid to a second of said two end points of said trace.
[0054] Preferably, said two segments subtend an angle greater than or equal to 180°.
[0055] Preferably, said two segments subtend an angle lower than or equal to 210°.
[0056] Preferably, said angle is between said two segments and is measured from the side facing said trace.
[0057] The Applicant has verified that in this way most of the diffused light rays emitted through the diffusing body and passing through the through opening of the shutter body are intercepted by the reflecting surface of the reflector, thus preventing a significant light flux passing through the through opening of the shutter body from not being reflected by the reflector.
[0058] Preferably, said diffusing body is interposed between said light guide and said shutter body.
[0059] Preferably, said shutter body comprises fastening members for retaining the diffusing body on the outlet of the light guide and for retaining the shutter body on the diffusing body.
[0060] Preferably, said light source comprises a first plurality of white light-emitting diodes having a first colour temperature.
[0061] Preferably, said light source comprises a second plurality of white light-emitting diodes having a second colour temperature greater than the first colour temperature.
[0062] Preferably, while exiting the diffusing body, the light beams of the first plurality of light-emitting diodes and the second plurality of light-emitting diodes are substantially mixed.
[0063] The Applicant has noted that by placing said diffusing body in the optical path of a point source, such as a light-emitting diode, the light rays emitted by the point source undergo diffused reflections when passing through the diffusing body, being reflected in random directions.
[0064] The Applicant perceived that by placing the diffusing body in the optical path of two light-emitting diodes having two different colour temperatures, the diffused reflections occurring when passing through the diffusing body tend to mix the light rays of the two light-emitting diodes.
[0065] Thus, by appropriately driving the first plurality of light-emitting diodes and the second plurality of light-emitting diodes with a two- channel driver electronics, it is possible to vary the colour temperature exiting the diffusing body and reflected on the light spot.
[0066] This makes it possible to illuminate the operating field with light having a different colour temperature depending on the type of operation that, a dentist for example, has to perform.
[0067] Indeed, an operation on the soft tissues of the oral cavity or during the polymerisation of dental curing compounds may require warm light illumination to highlight the red and reduce the blue component, while an operation on teeth requires neutral or cold light illumination to highlight the white-tinged colour of the teeth.
[0068] Preferably, the light-emitting diodes of the first plurality of lightemitting diodes are alternated with light-emitting diodes of the second plurality of light-emitting diodes according to a predetermined pattern.
[0069] The characteristics and advantages of the present invention will become clear from the following detailed description of a possible embodiment, shown by way of non-limiting example in the accompanying drawings, wherein:
[0070] - Figure 1 is a schematic perspective view of an operating lamp structure according to the present invention; - Figure 2 is a further schematic perspective view of the lamp structure of Figure 1 with some parts removed to better highlight others;
[0071] - Figure 3 is an exploded side view of some components of the lamp structure in Figure 1;
[0072] - Figure 4 is a schematic cross-sectional view along the plane IV- IV of some components of the lamp structure of Figure 1;
[0073] - Figure 5 is a schematic perspective view of the lamp structure in Figure 1 wherein some reference planes and segments have been represented;
[0074] - Figure 6 is a schematic perspective representation of an ellipsoid; and
[0075] - Figure 7 is a schematic representation of some components of the lamp structure in Figure 1 and reference planes and segments.
[0076] In the accompanying figures, an operating lamp structure according to the present invention is globally referred to by number 10.
[0077] The structure 10 comprises a light source 11 configured to emit light beams.
[0078] In the preferred embodiment of the invention, the light source 11 comprises light-emitting diodes 12 driven by one or more drivers.
[0079] Light-emitting diodes 12 are preferably single die LEDs with a white light emission. Light-emitting diodes 12 comprise a first 12a and a second 12b plurality of light-emitting diodes having different colour temperatures.
[0080] The light-emitting diodes of the first plurality of light-emitting diodes 12a have a first colour temperature between about 2400 K and 3500 K, preferably of about 2700 K, and the LED diodes of the second plurality of LED diodes 12b have a colour temperature between about 5500 K and 7500 K, preferably of about 6500 K. In other embodiments, the two colour temperatures indicated above may be different; in any case these two colour temperatures are different from each other.
[0081] The number of light-emitting diodes of the first plurality of lightemitting diodes 12a is greater than or equal to 1, preferably between 2 and 16. The number of light-emitting diodes of the second plurality of light-emitting diodes 12b is equal to the number of light-emitting diodes of the first plurality of lightemitting diodes 12a.
[0082] The light-emitting diodes 12 are arranged mutually close to each other, i.e. in such a way that they are as close as possible compatible with the assembly requirements thereof.
[0083] The light-emitting diodes of the first plurality of light-emitting diodes 12a and the second plurality of light-emitting diodes 12b are arranged in a predefined, pre-ordered pattern.
[0084] Light-emitting diodes 12 are placed close to a heat sink 13.
[0085] The light source 11 is assembled on a support frame 14. The heat sink 13 is also assembled on the support frame 14. In the embodiment shown in the accompanying figures, the heat sink is made in a single piece with the support frame 14.
[0086] The lamp structure 10 further comprises a light guide 15 having an inlet 15a and an outlet 15b to transmit the light rays emitted by the light source 11 from the inlet 15a to the outlet 15b. The inlet 15a of the light guide 15 is directly facing the light source 11, so that the light rays emitted by the light source 11 are all intercepted by the light guide 15 and transmitted to the outlet 15b of the latter.
[0087] In the embodiment shown in the accompanying figures, the light guide has a substantially prismatic shape with a substantially circular lower base (defining the inlet 15a) and a substantially rectangular upper base (defining the outlet 15b). In other embodiments not shown, the light guide 15 may have different shapes. In any case, irrespective of the shape of the light guide 15, the latter is configured to convey the light rays emitted by the light source 11 from the inlet 15a to the outlet 15b distal from the inlet 15a.
[0088] At the outlet 15b of the light guide 15, the lamp structure 10 comprises a diffusing body 16. The diffusing body 16 has an inner surface 16a placed at the outlet 15b of the light guide 15 and an outer surface 16b opposite the inner surface 16a. The diffusing body 16 has such optical properties as to diffuse reflection of light rays incident on the inner surface 16a so as to emit light rays diffused from the outer surface 16b. The diffused light rays exiting the diffusing body 16, i.e. exiting the outer surface 16b, have random directions forming an essentially Lambertian emission.
[0089] The diffusing body 16 is preferably made of plastic material, e.g. polyester. In the preferred embodiment of the invention, the diffusing body 16 has a substantially constant thickness of between 0.050 mm and 3 mm, preferably of about 0.250 mm. The diffusing body 16 is substantially flat and can be die-cut from a sheet.
[0090] While exiting the diffusing body 16, the light rays emitted by the LEDs 12 of the two pluralities of LEDs and which, passing through the light guide 15 reach the diffusing body 16, are substantially mixed, blending into each other and giving the impression of a colour temperature between the two colour temperatures of the light-emitting diodes 12.
[0091] By adjusting the drive current of the first 12a and the second plurality of light-emitting diodes 12b, it is possible to obtain a plurality of combinations between the drive current value of the first plurality of light-emitting diodes 12a and the drive current value of the second plurality of light-emitting diodes 12b. Each of this plurality of combinations corresponds to a different colour temperature perceived at the outlet of the diffusing body 16.
[0092] The diffusing body 16 is placed at a second focus F2 of an ellipsoid EL. This ellipsoid EL (schematically shown in Figure 6) is not physically present in the lamp structure 10 and must be understood as a hypothetical ellipsoid having the aforementioned second focus F2 and a first focus Fl.
[0093] The light source 11 is not placed at the second focus F2 of the ellipsoid EL. The light source 11 can be placed in any position and, through the light guide 15, the light rays emitted by it are directed onto the diffusing body 16.
[0094] In embodiments not shown, the light source 11 may be placed in a position distal from the diffusing body 16 and the light guide 15 may be made by one or more optical fibres which may also travel along curved paths to bring the light rays emitted by the light source 11 to the diffusing body 16.
[0095] The lamp structure 10 further comprises a shutter body 17 placed on the diffusing body 16 and having a passage opening 18 for the diffused light rays emitted by the diffusing body 16. The shutter body 17 is made of a light-opaque material, i.e. a material that is not penetrated by light rays.
[0096] The passage opening 18 is located directly facing the outer surface 16b of the diffusing body 16. The passage opening 18 is obtained on an upper wall 19 of the shutter body 18 and is delimited by an inner edge 18a. This inner edge 18a defines the size and shape of the through opening 18. The shape and size of the through opening 18 are substantially the same as the shape and size of the outer surface 16b of the diffusing body 16. In particular, the size of the through opening 18 is slightly smaller than the size of the outer surface 16b of the diffusing body 16.
[0097] In this respect, as schematically shown in Figure 4, the upper wall 19 of the shutter body 17 is superimposed on the outer surface 16b of the diffusing body 16 so that an outer edge 16c of the diffusing body 16 is in contact with the upper wall 19 of the shutter body 19 in a position not affected by the through opening 19. A distance DI between the outer edge 16c of the diffusing body 16 and the inner edge 18a of the upper wall 19 of the shutter body 17 is such that the upper wall 19 retains the diffusing body 16 in position without the latter being able to pass through the passage opening 18. This distance DI is for example of about 0.5 millimetres.
[0098] The shutter body 17 comprises a side wall 20 which completely surrounds the diffusing body 16 and at least the outlet 15b of the light guide 15, so that all the light rays emitted by the light source 11 can exit the assembly, given by the light source 11, the light guide 15, the diffusing body 16 and the shutter body 17, from the single passage opening 18 of the shutter body 19. In the embodiment shown in the accompanying figures, the side wall 20 completely surrounds the entire light guide 15 and light source 11.
[0099] The shutter body 17 further comprises fastening members 21 for retaining the diffusing body 16 on the outlet 15b of the light guide 15 and for retaining the shutter body 17 on the diffusing body 16. The fastening members 21 fasten the shutter body 17 to the support frame 14. The fastening members 21 comprise screws 22 (or alternatively bolts, snap-fit type fasteners or the like) that fasten the shutter body and support structure 14 together. In the embodiment shown in the accompanying figures, the screws 22 pass through holes 23 in the shutter body 17 and are anchored to the support body 14, as schematically shown in the exploded view of Figure 3.
[0100] The lamp structure 10 further comprises a lamp body 24. The lamp body 24 is fastened to the support frame 14. In the embodiment shown in the accompanying figures, the support frame 14 is fastened to the lamp body 24 at one end opposite the end to which the shutter body 17 is fastened. The lamp body 24 comprises a containment wall 25 having an edge 25a defining an opening 25b. The containment wall is made of light-opaque material. The support frame 14 is fastened to the lamp body 24 so as to face the outer surface 16b of the diffusing body 16 to the containment wall 25 (as schematically shown in Figure 2 where the portion of the containment wall 25 which the outer surface 16b of the diffusing body 16 faces is substantially shown as transparent) and so as to position the outer surface 16b of the diffusing body 16 in an area substantially subtended by the opening 25b of the lamp body 24.
[0101] A reflector 26 is fastened to the lamp body 24. The reflector 26 has a reflecting surface 26a with a shape corresponding to a portion of the surface of the ellipsoid EL in whose second focus F2 the outer surface 16b of the diffusing body 16 is placed.
[0102] As is immediately perceivable from Figures 1 and 2, no other component of the lamp structure 10 and in particular no optical element is placed between the outer surface 16b of the diffusing body 16 and the reflecting surface 26a.
[0103] The diffused light rays exiting the diffusing body 16 reach the reflecting surface 26a and are reflected from it to converge in the first focus Fl of ellipsoid EL, as schematically shown in Figure 7. The light spot 100 (i.e. the operating field to be illuminated) is placed along the optical path of the diffused light rays reflected by the reflecting surface 26a. The light spot 100 is placed between the second focus F2 and the first focus Fl, for example at 700 millimetres from the second focus F2. The shape of the light spot is substantially the same as the shape of the passage opening 18 of the shutter body 19. In the light spot 100 the illuminance is even, i.e. the light flux is substantially constant at all points in the light spot 100.
[0104] The diffused light rays reflected by the reflecting surface 26a exit the lamp body 24 through the opening 25b of the lamp body 24. Between the reflecting surface 26a and the opening 25b of the lamp body 24, there is no optical element passed through by the diffused light rays reflected by the reflecting surface 26a. In the preferred embodiment of the invention, the opening 25b of the lamp body 24 is not closed by any protective screen. In alternative embodiments, the opening 25b of the lamp body 24 can be closed by a protective screen that prevents dust and foreign bodies from entering the lamp body. In this case, the protective screen is made of transparent material and has no optical lens properties. The reflecting surface 26a of the reflector 26 is a single, continuous surface. The reflector 26 is fastened to the containment wall 25 of the lamp body 24 so that the reflecting surface is directly facing the passage opening 18 of the shutter body 17.
[0105] The reflecting surface 26a is oriented in space as described below.
[0106] As schematically shown in Figures 5 and 6, a plane of symmetry of the ellipsoid EL passing through the first focus Fl and the second focus F2 intersects the reflecting surface 26a. The intersection of the reflecting surface 26a on this plane of symmetry PS defines a trace TR which is a curved line with two end points TRI, TR2.
[0107] A first segment SI is contained in the plane of symmetry PS and joins the second focus F2 of the ellipsoid EL to a first end point TRI of the two end points. A second segment S2 is contained in the plane of symmetry PS and joins the second focus F2 of the ellipsoid EL to a second end point TR2 of the two end points. The first segment SI and the second segment S2 form an angle AN with each other facing the trace TR of the reflecting surface 26a. This angle AN is greater than or equal to 180° and lower than 210°, for example the angle AN is approximately 190°.
[0108] The trace TR of the reflecting surface 26a is symmetrical with respect to an axis contained in the plane of symmetry PS and passing through the first focus Fl and the second focus F2.
[0109] The reflecting surface 26a is symmetrical with respect to the plane of symmetry PS. The reflecting surface 26a is symmetrical to a plane perpendicular to the plane of symmetry PS and passing through the first focus Fl and the second focus F2.
[0110] Obviously, a person skilled in the art, in order to meet contingent and specific requirements, can make numerous modifications to the variants described above, such as providing for different diffusing body shapes, all of which are, however, within the scope of protection as defined by the following claims.
Claims
CLAIMS1. Operating lamp structure (10) comprising: a light source (11) to emit light beams; a light guide (15) having an inlet (15a) and an outlet (15b) for transmitting said light beams from the inlet (15a) to the outlet (15b), wherein the inlet (15a) is directly facing said light source (11); a diffusing body (16) placed in a predetermined zone and placed at the outlet (15b) of the light guide (15), wherein said light beams enter said diffusing body (16) and wherein diffused light beams exit said diffusing body (16); a shutter body (17) placed on said diffusing body (16) and having a passage opening (18) for said diffused light beams; a reflector (26) having a reflecting surface (26a) with a shape corresponding to a portion of the surface of an ellipsoid (EL) to reflect said diffused light beams to a first focus (Fl) of the ellipsoid (EL); wherein a photometric solid created by said diffused beams exiting said diffusing body (16) has a shape given by an emission substantially Lambertian; wherein said passage opening (18) of the shutter body (17) is facing the reflecting surface (26a) of the reflector (26) and wherein said predetermined zone is placed at a second focus (F2) of said ellipsoid (EL).
2. Operating lamp structure (10) according to claim 1, wherein between said shutter body (17) and the reflecting surface (26a) of the reflector (26), the lamp structure does not comprise any optical element.
3. Operating lamp structure (10) according to claim 1 or 2, wherein the lamp structure does not comprise any optical element placed along an optical path of the diffused light beams reflected by the reflecting surface (26a) of the reflector (26).
4. Operating lamp structure (10) according to any one of thepreceding claims, wherein said diffusing body (16) comprises an inner surface (16a) facing the light guide (15) and an outer surface (16b) facing said shutter body (17); the outer surface (16b) of the diffusing body (16) having substantially the same shape of the through opening (18) of the shutter body (17).
5. Operating lamp structure (10) according to any one of the preceding claims, wherein said reflecting surface (26a) of said reflector (26) is a single, continuous surface.
6. Operating lamp structure (10) according to any one of the preceding claims, wherein said diffusing body (16) is interposed between said light guide (15) and said shutter body (17); said shutter body (17) comprising fastening members (21) for retaining said diffusing body (16) on the outlet (15b) of the light guide (15) and for retaining said shutter body (17) on said diffusing body (16).
7. Operating lamp structure (10) according to any one of the preceding claims, wherein said light source (11) comprises a first plurality of white light-emitting diodes (12a) having a first colour temperature and a second plurality of white light-emitting diodes (12b) having a second colour temperature greater than the first colour temperature.
8. Operating lamp structure (10) according to claim 7, wherein the LED diodes of the first plurality of light-emitting diodes (12a) are alternated with the LED diodes of the second plurality of lightemitting diodes (12b) according to a predetermined pattern.
9. Operating lamp structure (10) according to claim 7 or 8, wherein, while exiting the diffusing body (16), the light beams of the first plurality of light-emitting diodes (12a) and the second plurality of light-emitting diodes (12b) are substantially mixed.
10. Operating lamp structure (10) according to any one of the preceding claims, wherein said reflecting surface (26a) of the reflector (26) defines a trace (TR.) on a plane of symmetry (PS)for said ellipsoid (EL) passing through the first focus (Fl) and the second focus (F2); said trace (TR) having two end points (TRI, TR2); two segments (SI, S2) contained in said plane of symmetry (PS) which join respectively the second focus (F2) of the ellipsoid (EL) and said two end points (TR.1, TR2) of said trace (TR) subtending an angle (AN) greater than or equal to 180°; said angle (AN) being comprised between said two segments (SI, S2) on the side facing said trace (TR).