Semiconductor radiation source

Abstract

A semiconductor radiation source, having at least two light sources which are fixed on a common base body and so light can be emitted gently over a total emission spectrum, the first light source having a short-wave, in particular from 400 to 430 nm emission spectrum, and the second light source having a longer-wave, in particular from approximately 450 to 480 nm emission spectrum. The first light source (16) is arranged in an optical axis (22) and the second light source (18) has at least two chips (24, 26, 28, 30) which are arranged in particular symmetrically with respect to one another and with respect to the optical axis (22) and in a manner surrounding the optical axis (22).

Description

BRIEF DESCRIPTION OF THE FIGURES

Further advantages, details and features of the invention emerge from the following description of a plurality of exemplary embodiments of the invention with reference to the drawing, in which:

FIG. 1 shows a first schematic embodiment of a radiation source according to the invention in plan view;

FIG. 2 shows a second embodiment of a radiation source according to the invention likewise in plan view;

FIG. 3 shows a further embodiment of a radiation source according to the invention in plan view;

FIG. 4 shows the embodiment in accordance with FIG. 3 in side view;

FIG. 5 shows a further embodiment of a radiation source according to the invention in plan view;

FIG. 6 shows the embodiment in accordance with FIG. 5 in side view;

FIG. 7 shows the embodiment in accordance with FIGS. 5 and 6 in an enlarged illustration;

FIG. 8 shows a further embodiment of the radiation source according to the invention in plan view; per se.

FIG. 9 shows the embodiment in accordance with FIG. 8 in side section;

FIG. 10 shows a further embodiment of a radiation source according to the invention in plan view;

FIG. 11 shows the embodiment in accordance with FIG. 10 in lateral section;

FIG. 12 shows a further embodiment of a radiation source according to the invention in lateral section;

FIG. 13 shows a further embodiment of a radiation source according to the invention in lateral section;

FIG. 14 shows a further embodiment of a radiation source according to the invention.

Claims

1. A semiconductor radiation source for curing light-polymerizable dental materials, said source comprising: a common base body;at least two light sources which are fixed on the common base body and by means of which light can be emitted jointly over a total emission spectrum, the first light source having a short-wave, in particular from 400 to 430 nm emission spectrum, andthe second light source having a longer-wave, in particular from approximately 450 to 480 nm emission spectrum,wherein one of the light sources (16), in particular the first light source, is arranged in an optical axis (22) and the other light source (18), in particular the second light source, has at least two chips (24, 26, 28, 30) which are arranged in particular symmetrically with respect to one another and with respect to the optical axis (22) and in a manner surrounding the optical axis (22).

2. The radiation source as claimed in claim 1, wherein the second light source (18) has four chips (24, 26, 28, 30) arranged in the manner of a cross or star around the first light source (16), and wherein the first light source (16) has one chip.

3. The radiation source as claimed in claim 1, wherein the light sources (16, 18) closely adjoin one another.

4. The radiation source as claimed in claim 1, wherein all the LED chips (24, 26, 28, 30) are arranged in a central region (14) of the base body (12).

5. The radiation source as claimed in claim 1, wherein the light sources are fixed on the base body (12) by means of an adhesive bonding connection or by means of a soldering connection.

6. The radiation source as claimed in claim 1, wherein the base body (12) has a thermal conductivity that is better than 0.5° C./W.

7. The radiation source as claimed in claim 1, wherein the base body (12) is electrically conductive.

8. The radiation source as claimed in claim 1, wherein the base body (12) at least partly comprises copper and, in particular, is at least partly coated with gold or nickel-gold.

9. The radiation source as claimed in claim 1, wherein electrical connection areas for the light sources are arranged as zones, in particular on a printed circuit board, and wherein bonding wires (50) extend from the chips (24, 26, 28, 30) to the electrical connection areas.

10. The radiation source as claimed in claim 1, wherein the printed circuit board extends from the centrally arranged LED chips (24, 26, 28, 30) toward the outside, in particular to the peripheral region of the base body (12).

11. The radiation source as claimed in claim 1, wherein a convex covering lens is arranged in the beam path downstream of the LED chips (24, 26, 28, 30), said covering lens being formed in plane fashion in particular on the side facing the light sources, and wherein a spacer therefor is formed essentially in tubular or linear fashion, and wherein the spacer is at least partly supported on a printed circuit board and/or the base body (12).

12. The radiation source as claimed in claim 11, wherein a closed space having a transparent or translucent, liquid or gelatinous substance, in particular silicone gel or a potting composition, extends between the LED chips (24, 26, 28, 30), the spacer and the covering lens.

13. The radiation source as claimed in claim 12, wherein the substance has phosphorus particles.

14. The radiation source as claimed in claim 11, wherein a converging lens is arranged in the beam path downstream of a covering lens, the diameter of said converging lens being, in particular, greater than the diameter of the covering lens.

15. The radiation source as claimed in claim 11, wherein a reflector is arranged at a distance from the LED chips (24, 26, 28, 30) in front of the latter, that is to say downstream of the latter in the beam path, and, in particular, also downstream of a covering lens in the beam path.

16. The radiation source as claimed in claim 14, wherein an optical waveguide is arranged in the beam path downstream of the converging lens.

17. The radiation source as claimed in claim 14, wherein the covering lens (52) has a significantly larger diameter than the light sources (16, 18) and the converging lens (60) has a significantly larger diameter than the covering lens (52), the diameter ratios respectively lying between 1.2:1 and 10:1, in particular.

18. The radiation source as claimed in claim 1, wherein the first and second light sources can be switched on jointly or at different points in time and/or can be switched off jointly or at different points in time.

19. The radiation source as claimed in claim 11, wherein an essentially annular spacer supports the covering lens at least partly on the printed circuit board and/or the base body and surrounds the LED chips, and wherein a reflector is arranged in the beam path downstream of the covering lens.

20. The radiation source as claimed in claim 19, wherein the spacer has a conical or parabolic section on its side facing the LED chips.