Abstract
A dental light polymerization device has a polymerization light source and a camera. The dental light polymerization device comprises an actively movable light reflector. The invention provides for emitting light for polymerization of a dental material and capturing an image in the same dental light polymerization device.
Claims
1. A dental light polymerization device, comprising a polymerization light source, a camera, and an actively movable light reflector.
2. The dental light polymerization device of claim 1, wherein the reflector is movable between a first positional arrangement, in which the reflector establishes a first optical path between the polymerization light source and an object, and a second positional arrangement, in which the reflector establishes a second optical path between the object and the camera, wherein alternatively or in combination: in the first positional arrangement the second optical path is suspended; in the second positional arrangement the first optical path is suspended.
3. The dental light polymerization device of claim 1, wherein the reflector is formed by a prism.
4. The dental light polymerization device of claim 1, wherein the reflector is formed by a mirror.
5. The dental light polymerization device of claim 2, wherein the reflector is rotatable between the first and the second positional arrangement.
6. The dental light polymerization device of claim 2, being operable for periodically moving the reflector between the first and second positional arrangement.
7. The dental light polymerization device of claim 6, wherein one period comprises maintaining the reflector in the first positional arrangement for a first time period, moving the reflector to the second positional arrangement, maintaining the reflector in the second positional arrangement for a second time period, and moving the reflector to the first positional arrangement.
8. The dental light polymerization device of claim 7, wherein the first and second time periods are different, preferably at a ratio of about 40:1 to about 2:1.
9. The dental light polymerization device of claim 4, wherein the reflector is formed by a multiplicity of micromirrors provided by a Digital Micromirror Device.
10. The dental light polymerization device of claim 2, wherein in the first positional arrangement the camera is deactivated, and wherein in the second positional arrangement the polymerization light source is deactivated.
11. The dental light polymerization device of claim 2, wherein in the second positional arrangement an illumination light source is activated.
12. The dental light polymerization device of claim 11, wherein the illumination light source is configured to emit visible light having a spectrum comprising light at wavelengths between 380 nanometers and 750 nanometers.
13. The dental light polymerization device of claim 11, wherein the illumination light source comprises a plurality of white LEDs.
14. The dental light polymerization device of claim 1, wherein the polymerization light source is configured to emit visible light predominantly within a wavelength range 450 nanometers-495 nanometers.
15. The dental light polymerization device of claim 14, wherein the polymerization light source consists of a single high power LED.
Description
BRIEF DESCRIPTION OF THE FIGURES
[0022] FIG. 1 is a concept view of a dental light polymerization device according to an embodiment of the invention at one stage of operation;
[0023] FIG. 2 is a concept view of the dental light polymerization device of FIG. 1 at a different stage of operation;
[0024] FIG. 3 is a concept view of a further dental light polymerization device according to an embodiment of the invention;
[0025] FIG. 4 is a concept view of a further dental light polymerization device according to an embodiment of the invention;
[0026] FIG. 5 is a perspective partial view of a dental light polymerization device according to an embodiment of the invention; and
[0027] FIG. 6 is a perspective partial view of a dental light polymerization device according to another embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
[0028] FIGS. 1 and 2 show an example of a dental light polymerization device 1 of the invention at two different stages of operation. The dental light polymerization device 1 has a polymerization light source 11 and a camera 12. The polymerization light source 11 comprises a blue power LED which emits light in a wavelength range of about 460 nanometers to 490 nanometers and having a maximum light intensity at about 470 nanometers. A blue power LED as it may be used with the present invention is for example available under the designation LUXEON Z Blue from Philips Lumileds Lighting Company. The camera 12 in the example is a color CCD camera. The dental light polymerization device 1 has a mirror 13 which is movable between a first positional arrangement as illustrated in FIG. 1 and a second positional arrangement as illustrated in FIG. 2. In the example the mirror 13 is rotatable about a rotation axis R. The skilled person will however recognize configurations in which the mirror is movable linearly or otherwise as appropriate.
[0029] In FIG. 1 (in the first positional arrangement) the mirror 13 establishes a first optical path 15 between the polymerization light source 11 and an object 500 (preferably a tooth in a patient's mouth). In the example the first optical path is established in that the mirror 13 is positioned outside that first optical path 15. Hence, in the example, there is no relevant interaction between the mirror and the polymerization light source 11. The dental light polymerization device 1 further has a lens 14 which is arranged down-beam of the polymerization light source 11. The lens 14 is configured to convert light emitted from the polymerization light source into a generally parallel and generally uniform light beam.
[0030] In operation of the dental light polymerization device 1 in the first positional arrangement (FIG. 1) the polymerization light source emits blue light toward the object 500. If the object is a tooth, thus a light hardenable dental material filled in a cavity of that tooth may be hardened by exposure to the blue light emitted by the dental light polymerization device 1.
[0031] In FIG. 2 (in the second positional arrangement) the mirror 13 establishes a second optical path 16 between the object 500 and the camera 12. In the example, the second optical path 16 is established in that the mirror 13 is positioned within the first optical path 15, thus blocking light emitted by the polymerization light source 11 from reaching the object, and in that the mirror is positioned such that light coming from the object is deflected by the mirror toward the camera 12.
[0032] In operation of the dental light polymerization device 1 the mirror 13 continuously rotates about the rotation axis R and thus alternately changes between the first and second positional arrangement. It is noted that the first positional arrangement of the mirror in this example includes at least a first range of different particular angular positions in which the mirror 13 is positioned outside the first optical path 15. FIG. 1 illustrates one particular position of the mirror 13. There may further be a second range of different particular angular positions in which the mirror 13 establishes the second positional arrangement. However, the second range is smaller, in particular significantly smaller, than the first range. Therefore, in a continuous and uniform rotation the mirror 13 is positioned predominantly in the first positional arrangement and less dominantly in the second positional arrangement. Accordingly, in operation the dental light polymerization device 1 predominantly emits blue light and intermittently captures one or more images from the object while the object is not illuminated by blue light.
[0033] As illustrated the polymerization light source 11 is arranged in the dental light polymerization device 1 to emit light in a light emitting direction 17 (along optical path 15) and the camera 12 is arranged in the dental light polymerization device 1 to receive light from an image receiving direction 18 which is transverse or inclined to light emitting direction. The light emitting direction 17 and the image receiving direction 18 in the example intersect outside the object.
[0034] FIG. 3 shows a further example of a dental light polymerization device 1 of the invention. The light polymerization device 1 has a polymerization light source 11 and a camera 12. The polymerization light source 11 and the camera are identical to the example shown in FIGS. 1 and 2. However, the polymerization light source 11 and the camera 12 are arranged differently with respect to each other compared to the example shown in FIGS. 1 and 2. In particular, the polymerization light source 11 is arranged such that the light emitting direction 17 of the polymerization light source 11 is directed toward a movable, in particular tiltable, mirror 13. The mirror 13 is movable between a first positional arrangement A1 and a second positional arrangement A2. (The same mirror 13 is shown in the two different first and second positional arrangement.) In the first positional arrangement A1 the mirror 13 establishes a first optical path 15 between the polymerization light source 11 and the object 500. In the second positional arrangement A2 the mirror 13 establishes a second optical path 16 between the object 500 and the camera 12. In this example, in the first positional arrangement A1 the second optical path 16 is disabled. This means that light coming from the object 500 is deflected relative to the second optical path 16. Thus, the light from the object 500 does not reach the camera 500. Further, in the second positional arrangement A2 the first optical path 16 is disabled. This means that light emitted from the polymerization light source 11 is deflected relative to the first optical path 15. Thus, the light from the polymerization light source 11 does not reach the object 500. In the example, the mirror 13 is moved only for the positioning between the first and second positional arrangement A1, A2 and otherwise stands still. The time at which the mirror 13 remains in the first positional arrangement A1 is preferably longer than the time the mirror remains in the second positional arrangement A2. Further, the time for moving the mirror 13 is preferably shorter than the time at which the mirror 13 remains in the first positional arrangement A1, and may be shorter than the time the mirror remains in the second positional arrangement A2.
[0035] FIG. 4 shows a further example of a dental light polymerization device 1 of the invention. The dental light polymerization device 1 is identical to the dental light polymerization device 1 shown in FIG. 3, but with the mirror being replaced by a so-called Digital Mirror Device (DMD). A DMD comprises a multiplicity of micro-mirrors 13 which are individually movable by the force of electrostatic fields between two positions. In the example, the micro-mirrors 13 of the DLD are preferably controlled to switch all at a time between a first and a second positional arrangement A1, A2. Again, in the first positional arrangement A1 the micro-mirrors 13 establish a first optical path 15 between the polymerization light source 11 and the object 500. In the second positional arrangement A2 the mirror 13 establishes a second optical path 16 between the object 500 and the camera 12.
[0036] FIG. 5 shows yet another example of a dental light polymerization device 1 of the invention. The dental light polymerization device 1 has a polymerization light source 11 and a camera 12 which is identical with the examples in FIGS. 1 to 4. A rotatable mirror 13 is arranged so as to establish a first optical path (not illustrated) between the polymerization light source 11 and an object (not shown) and, alternatively, a second optical path between the object and the camera 12. The function of the light polymerization device 1 corresponds to the function as described in the example of FIG. 3.
[0037] The light polymerization device 1 of FIG. 5 further has an illumination light source 19, which in the example is formed by a number of individual LEDs 20 which are configured to emit white light. The dental light polymerization device 1 is configured such that the camera 12 and the illumination light source 19 are activated at least temporarily simultaneously during a stage at which the mirror 13 is positioned in the second positional arrangement. Thus, the object can be illuminated by the illumination light source 19 during the camera 12 captures an image of the object. Further, the dental light polymerization device 1 is configured such that the polymerization light source 11 is inactive during the stage at which the mirror 13 is positioned in the second positional arrangement. Thus, light of the polymerization light source 11 does not interfere with the light used for capturing the image of the object. The dental light polymerization device 1 is further preferably configured such that the illumination light source 19 and the camera 12 are inactive during a stage at which the mirror 13 is positioned in the first positional arrangement. In this stage, the polymerization light source 11 is activated.
[0038] FIG. 6 shows an example of a dental light polymerization device 1 of the invention. The dental light polymerization device 1 has a polymerization light source 11 and a camera 12 which is identical with the examples in FIGS. 1 to 4. In this example the dental light polymerization device 1 has a mirror 13 that is linearly movable about a moving axis M. The moving axis M is parallel, in particular coincident, with an image receiving direction 18 of the camera 12. In the example, the mirror 13 is provided by a mirrored surface of a transparent prism 21. The skilled person will however recognize other solutions for providing a mirror, for example a flat mirror which is arranged inclined. The prism 21 and thus the mirror 13 are movable between a first positional arrangement and a second positional arrangement (as shown in the Figure). In the second positional arrangement the mirror 13 is arranged to establish a second optical path between an object (not shown) and the camera 12. Further, in the first positional arrangement the mirror 13 is arranged to establish a first optical path between the polymerization light source 11 and the object (not shown). In the second positional arrangement the prism 21 overlaps a light output area of the polymerization light source 11. Thus, in the second positional arrangement the mirror 13 is positioned within the first optical path, whereas in the first positional arrangement the mirror 13 is arranged outside the first optical path.
[0039] The light polymerization device 1 of FIG. 6 further has an illumination light source 19, which in the example is formed by a number of individual LEDs 20. Each of the LEDs 20 are configured to emit white light. The dental light polymerization device 1 is configured such that the camera 12 and the illumination light source 19 are activated at least temporarily simultaneously during a stage at which the mirror 13 is positioned in the second positional arrangement. Further, the dental light polymerization device 1 is configured such that the polymerization light source 11 is inactive during the stage at which the mirror 13 is positioned in the second positional arrangement. The dental light polymerization device 1 is further preferably configured such that the illumination light source 19 and the camera 12 are inactive during a stage at which the mirror 13 is positioned in the first positional arrangement. In this stage, the polymerization light source 11 is activated.
