Illumination device with an extended useable spectrum
An illumination device for irradiating objects with electromagnetic radiation is provided. The illumination device includes at least one light guide and a radiation source that emits electromagnetic radiation in the spectral region from 320 nm to 420 nm into the light guide. The light guide is formed of a glass that has a spectral transmittance of at least 70% at 350 nm and is selected from the system of lead-free silicate-tin glasses.
1. An illumination device for irradiating objects with electromagnetic radiation, comprising:
at least one light guide; and
a radiation source, which, in an operating state, emits electromagnetic radiation comprising at least one sector of a spectral region from 320 nm to 420 nm into the at least one light guide, wherein the at least one light guide comprises at least one lead-free silicate-tin glass that is irradiated by the electromagnetic radiation in the operating state and that has a spectral transmittance of at least 70% at a wavelength of 350 nm.
2. The illumination device according to claim 1 , wherein the at least one lead-free silicate-tin glass comprises in wt. % based on oxide:
B 2 O 3
0
24;
SiO 2
23
62.1;
Al 2 O 3
0
10;
Li 2 O
0
10;
Na 2 O
0
18.5;
K 2 O
0
25.7;
BaO
0
57.8;
ZnO
0
40;
La 2 O 3
0
25;
ZrO 2
0
10;
HfO 2
0
14.2;
SnO 2
>0
2;
MgO
0
8;
CaO
0
8;
SrO
0
24.4;
Ta 2 O 5
0
22;
Y 2 O 3
0
11.9;
Rb 2 O
0
15;
Cs 2 O
0
21;
GeO 2
0
7.5;
F
0
2;
Σ R 2 O
5
20; and
Σ MgO, CaO, SrO, ZnO
20
42.
3. The illumination device according to claim 2 , wherein the at least one light guide is sheathed on an outer peripheral surface by at least one cladding glass, the at least one cladding glass being selected from the group consisting of Group 1, Group 2, Group 3, and Group 4, which contains components in wt. % based on oxide:
Group 1
Group 2
Group 3
Group 4
SiO 2
70-78
63-75
75-85
62-70
Al 2 O 3
5-10
1-7
1-5
1-10
B 2 O 3
5-14
0-3
10-14
>15
Li 2 O
0-2
0-1
0-3
0-2
Na 2 O
0-10
8-20
2-8
0-10
K 2 O
0-10
0-6
0-1
0-10
MgO
0-1
0-5
0
0-5
CaO
0-2
1-9
0
0-5
SrO
0-1
0
0
0-5
BaO
0-4
0-5
0
0-5
F
0-1
0-1
0
0-1
Cl
0-1
0-1
0
0-1
Fe 2 O 3
0-2
0-2
0-2
0-2.
4. The illumination device according to claim 2 , wherein the at least one light guide comprises a fiber bundle of a plurality of individual fibers, each of which has a core of the at least one lead-free silicate-tin glass.
5. The illumination device according to claim 4 , wherein each of the plurality of individual fibers further comprises a cladding of a cladding glass selected from the group consisting of Group 1, Group 2, Group 3, and Group 4, which contains components in wt. % based on oxide:
Group 1
Group 2
Group 3
Group 4
SiO 2
70-78
63-75
75-85
62-70
Al 2 O 3
5-10
1-7
1-5
1-10
B 2 O 3
5-14
0-3
10-14
>15
Li 2 O
0-2
0-1
0-3
0-2
Na 2 O
0-10
8-20
2-8
0-10
K 2 O
0-10
0-6
0-1
0-10
MgO
0-1
0-5
0
0-5
CaO
0-2
1-9
0
0-5
SrO
0-1
0
0
0-5
BaO
0-4
0-5
0
0-5
F
0-1
0-1
0
0-1
Cl
0-1
0-1
0
0-1
Fe 2 O 3
0-2
0-2
0-2
0-2.
6. The illumination device according to claim 1 , wherein the at least one light guide is a rigid light guide.
7. The illumination device according to claim 6 , wherein the rigid light guide has at least one bend.
8. The illumination device according to claim 1 , wherein the at least one light guide has an acceptance angle from 45° to 130° for the light irradiated in the operating state.
9. The illumination device according to claim 1 , wherein the at least one light guide has an acceptance angle from 75° to 130° for the light irradiated in the operating state.
10. The illumination device according to claim 1 , wherein the radiation source comprises at least one LED and/or at least one laser diode.
11. The illumination device according to claim 1 , wherein, in the operating state, the electromagnetic radiation is guided by the at least one light guide to a detection device.
12. The illumination device according to claim 11 , wherein the radiation source and/or detection device and the at least one light guide are separable from one another.
13. The illumination device according to claim 1 , wherein the device is configured for a use selected from the group consisting of a plastic curing device, a dental curing device, a device for identifying cell types, a device for identifying cancer cells, a device for recognizing caries, a dental handpiece, a dental angle piece, a surgical device, a diagnostic device, a skin analysis device, an otoscope, and an endoscope.