RADIATION SOURCE AND SKIN IRRADIATION DEVICE

Abstract

A radiation source for a skin irradiation device for tanning skin, designed to emit UV light at a spectral irradiance E.sub.(), the spectral irradiance E.sub.() being chosen such that the ratio of the NMSC-effective, biological irradiance E.sub.NMSC to the erythema-effective, biological irradiance E.sub.er is 0.9 or less.

Claims

1. A solarium for tanning skin with a radiation source, designed to emit UV light at a spectral irradiance E(), the biologically effective irradiance for the direct pigmentation Epi being at least 180 W/m2, characterized in that the spectral irradiance E() is chosen such that the ratio of the NMSC-effective, biological irradiance ENMSC to the erythema-effective, biological irradiance Eer is 0.9 or less.

2. The solarium according to claim 1, characterized in that the spectral irradiance E() has a maximum value in the wavelength range from 330 nm to 390 nm, and has values in the wavelength range from 299 nm to 311 nm and in the wavelength range from 315 nm to 329 nm, which do not exceed 5% of said maximum value.

3. The solarium according to claim 1, characterized in that the spectral irradiance E() has a maximum value in the wavelength range from 330 nm to 390 nm, and has values in the wavelength range from 299 nm to 329 nm, which do not exceed 5% of said maximum value.

4. The solarium according to claim 1, characterized in that the spectral irradiance E() has a maximum value in the wavelength range from 330 nm to 364 nm, and has values for wavelengths greater than 364 nm, which do not exceed 5% of said maximum value.

5. The solarium according to claim 1, characterized in that the radiation source has a low-pressure UV lamp.

6. The solarium according to claim 1, characterized in that the radiation source has a high-pressure UV burner.

7. The solarium according to claim 1, characterized in that the radiation source has a UV LED.

8. The solarium according to claim 1, characterized in that the radiation source has a filter disk.

9. The solarium according to claim 1, characterized in that the biologically effective irradiance for the direct pigmentation Epi is at least 200 W/m2.

10. The solarium according to claim 1, characterized in that the erythema-effective, biologically effective irradiance Eer does not exceed 1.0 W/m2, preferably does not exceed 0.3 W/m2.

11. The solarium according to claim 19, characterized in that the solarium is a sunbed or a sun shower.

Description

[0037] The invention is explained in greater detail below, with reference to exemplary embodiments depicted in figures, wherein:

[0038] FIG. 1 shows a diagram with the relative spectral sensitivities for the UV erythema and for NMSC,

[0039] FIG. 2 shows a diagram of the spectral irradiance E.sub.() of a LED shoulder tanner according to the prior art,

[0040] FIG. 3 shows a diagram of the spectral irradiance E.sub.() of a high-pressure radiator having a filter disk according to the prior art,

[0041] FIG. 4 shows a diagram of the spectral irradiance E.sub.() of low-pressure UV lamps according to the prior art,

[0042] FIG. 5 shows a diagram of the spectral irradiance E.sub.() of a UV LED according to the invention.

[0043] The relative spectral sensitivities S.sub. for the UV erythema and for NMSC are plotted over the wavelength k in nanometers in FIG. 1. The designation A.sub.boil() was used above for the same variables. The relative spectral sensitivity S.sub. is normalized and has no units and is plotted logarithmically in FIG. 1. The dashed curve shows the relative spectral sensitivity for NMSC, the solid line shows that for UV erythema. It is obvious that, in particular, in the wavelength range between approx. 296 nm and 333 nm, which is identified with the action functions for the erythema as well as for NMSC lie very close to one another, NMSC even exceeding erythema. The two action functions are indicated in tabular form in the DIN 5031-10:2018-03 standard.

[0044] FIGS. 2 to 5 each show a diagram of a spectral irradiance E.sub.() of a UV radiation source, indicated or, respectively measured at the distance provided during the tanning of the skin. The power in W/m.sup.2 striking in a wavelength interval of 1 nm is plotted over the wavelength k in nm. On said basis, the erythema-effective irradiance E.sub.er and the NMSC-effective irradiance E.sub.NMSC were calculated for each of the UV radiation sources, by forming the following sum:

[00002]$E_{\mathrm{eff}}=\underset{250\mathrm{nm}}{\overset{400\mathrm{nm}}{.Math.}}{S}_{}{E}_{}{}_{}$

[0045] Accordingly, as specified in the standard mentioned, the respective spectral sensitivity was multiplied by the spectral irradiance for each wavelength interval and the products were added up.

[0046] The spectral irradiance E.sub.() from FIG. 2 was measured with a double monochromator on a Blue Vision-branded LED shoulder tanner. The determined NMSC-effective irradiance E.sub.NMSC is 0.139 W/m.sup.2, the erythema-effective irradiance E.sub.er is 0.126 W/m.sup.2. The ratio of E.sub.NMSC to E.sub.er is 1.10.

[0047] The spectral irradiance E.sub.() from FIG. 3 was measured with a double monochromator on a high-pressure UV radiator having a filter disk (Prestige 1400, Filter disk Type 3). The determined NMSC-effective irradiance E.sub.NMSC is 0.464 W/m.sup.2, the erythema-effective irradiance E.sub.er is 0.299 W/m.sup.2. The ratio of E.sub.NMSC to E.sub.er is 1.55.

[0048] The spectral irradiance E.sub.() from FIG. 4 was measured with a double monochromator on low-pressure UV lamps (Ergo 1400 New Technology x-Tend plus with upper part). The determined NMSC-effective irradiance E.sub.NMSC is 0.408 W/m.sup.2, the erythema-effective irradiance E.sub.er is 0.291 W/m.sup.2. The ratio of E.sub.NMSC to E.sub.er is 1.40.

[0049] FIG. 5 shows the spectral irradiance E.sub.() of a radiation source according to the invention, which has a UV LED. The radiation emitted extends over a wavelength range from approximately 325 nm to approximately 372 nm and has a maximum value of 20.8 W/m.sup.2 at 340 nm. The determined NMSC-effective irradiance E.sub.NMSC is 0.170 W/m.sup.2, the erythema-effective irradiance E.sub.er is 0.292 W/m.sup.2. The ratio of E.sub.NMSC to E.sub.er is 0.59.

[0050] Further exemplary embodiments of the invention are indicated below in the form of numbered paragraphs: [0051] 1. A radiation source for emitting UV radiation for a skin irradiation device for tanning skin, characterized by a ratio of the NMSC-effective irradiance (E.sub.NMSC) to the erythema-effective irradiance (E.sub.er) of less than or equal to 0.9 (E.sub.NMSC/E.sub.er0.9). [0052] 2. The radiation source according to paragraph 1. characterized in that the ratio is substantially less than or equal to 0.9 over the entire wavelength range relevant to the skin tanning. [0053] 3. The radiation source according to paragraph 1 or 2, characterized in that the ratio is substantially less than or equal to 0.9 over a wavelength range from approx. 280 nm to approx. 340 nm. [0054] 4. The radiation source according to any one of the preceding paragraphs, characterized in that the radiation source is designed to emit substantially no/hardly any radiation in a wavelength range from approx. 296 nm to approx. 333 nm. [0055] 5. The radiation source according to any one of the preceding paragraphs, characterized in that the radiation source is designed to emit no/hardly any radiation as of a wavelength of 340 nm upwards. [0056] 6. The radiation source according to any one of the preceding paragraphs, characterized by a ratio of vitamin D3-effective irradiance (E.sub.D3) to erythema-effective irradiance (E.sub.er) of at least 0.14. [0057] 7. The radiation source according to any one of the preceding paragraphs, characterized in that the vitamin-D3-effective irradiance (E.sub.D3) is at least 0.03 W/m.sup.2. [0058] 8. The radiation source according to any one of the preceding paragraphs, characterized in that the radiation source comprises a low-pressure UV lamp. [0059] 9. The radiation source according to paragraph 8, characterized in that the low-pressure UV lamp is designed to only emit radiation in a wavelength range relating to the mercury peak in a wavelength range from approx. 296 nm to approx. 333 nm. [0060] 10. The radiation source according to any one of the preceding paragraphs, characterized in that the radiation source comprises a high-pressure UV burner, in particular having a filter disk. [0061] 11. The radiation source according to any one of the preceding paragraphs, characterized in that the radiation source has a UV LED. [0062] 12. The radiation source according to any one of the preceding paragraphs, characterized by an irradiance for the direct pigmentation (E.sub.pi) of at least 180 watts per square meter, preferably of at least 200 watts per square meter. [0063] 13. A skin irradiation device for tanning skin, comprising at least one radiation source according to any one of the preceding paragraphs. [0064] 14. The skin irradiation device according to paragraph 13, characterized in that the skin irradiation device is a solarium, in particular a sunbed or a sun shower.