Fitout articles and articles of equipment for kitchens or laboratories with a lighting element

Abstract

A fitout article or article of equipment for a kitchen or laboratory is provided. The article has a lighting and separating element. The separating element in a region of the lighting element has light transmittance of at least 0.1% and less than 12%. The lighting element in the interior emits light that passes through the separating element and to the exterior. The separating element has a glass or glass-ceramic substrate having a CTE of −6 to 6 ppm/K and has a colour locus in the CIELAB colour space with the coordinates L* of 20 to 40, a* of −6 to 6 and b* of −6 to 6. D65 standard illuminant light, after passing through the separating element, is within a white region W1 determined in the chromaticity diagram CIExyY−2° by the following coordinates: TABLE-US-00001 White region W1 x y 0.27 0.21 0.22 0.25 0.32 0.37 0.45 0.45 0.47 0.34 0.36  0.29.

Claims

1. A fitout article or article of equipment for a kitchen or laboratory, comprising: an interior; a separating element separating the interior from an exterior; and a lighting element in the interior such that light emitted by the lighting element passes through the separating element to the exterior, wherein the separating element comprises a glass or glass ceramic substrate having a coefficient of thermal expansion of −1.5 to 6 ppm/Kin a temperature range between 20° C. and 300° C. and a light transmittance of at least 0.1% and less than 12%, wherein the separating element has a colour locus in a CIELAB colour space with coordinates L* of 20 to 40, a* of −6 to 6 and b* of −6 to 6, measured in reflectance with D65 standard illuminant light against a black trap, and wherein the separating element has a colour locus of D65 standard illuminant light, after passing through the separating element, within a white region W1 determined in a chromaticity diagram CIExyY−2° by coordinates: TABLE-US-00013 White region W1 X y 0.27 0.21 0.22 0.25 0.32 0.37 0.45 0.45 0.47 0.34 0.36  0.29.

2. The fitout article or article of equipment of claim 1, further comprising no black-body compensation filter.

3. The fitout article or article of equipment of claim 1, wherein the light transmittance of the separating element is at least 2% and less than 9%.

4. The fitout article or article of equipment of claim 1, wherein the separating element has a transmission at a wavelength of 1600 nm of at least 30%.

5. The fitout article or article of equipment of claim 1, wherein the separating element has a transmission at at least one wavelength in a range between 900 nm and 1000 nm of at least 3%.

6. The fitout article or article of equipment of claim 1, wherein the separating element has a transmission at at least one wavelength in a range between 3.25 μm and 4.25 μm of at least 10%.

7. The fitout article or article of equipment of claim 1, wherein the glass or glass ceramic substrate is a glass ceramic substrate, the coefficient of thermal expansion of the glass ceramic substrate between 20 and 300° C. is −1.5 to 2.5×10-6/K.

8. The fitout article or article of equipment of claim 1, wherein the glass or glass ceramic substrate is a glass substrate, the coefficient of thermal expansion of the glass substrate between 20 and 300° C. is 0 to 6×10-6/K, and the glass substrate having a glass transition temperature of 500 to 650° C.

9. The fitout article or article of equipment of claim 1, wherein the colour locus in the CIELAB colour space has the coordinates 22≤L* ≤35, with −4≤a* ≤4, and with −4≤b* ≤4.

10. The fitout article or article of equipment of claim 1, wherein the separating element comprises a coating for adjustment of the light transmittance, wherein the coating comprises a material system selected from a group consisting of: spinels, cermets, carbides, and carbonitrides.

11. The fitout article or article of equipment of claim 1, wherein the glass or glass ceramic substrate is a glass ceramic substrate comprising a material selected from a group consisting of: 0.003-0.25% by weight of MoO3, less than 0.2% by weight of Nd2O3, and any combinations thereof.

12. The fitout article or article of equipment of claim 1, further comprising a difference between a percentage grey value that corresponds to a measured grey value of a colour card of RAL colour 9017 viewed through the separating element and a percentage grey value corresponding to a measured grey value of a colour card of RAL colour 9003 viewed through the separating element, wherein the difference is less than 5.0%.

13. The fitout article or article of equipment of claim 1, wherein the separating element has a haze of at most 5%.

14. The fitout article or article of equipment of claim 1, wherein the separating element has a clarity of at least 90%.

15. The fitout article or article of equipment of claim 1, wherein the lighting element has at least two intensity maxima in a visible spectral region.

16. The fitout article or article of equipment of claim 1, wherein the lighting element is an LED.

17. The fitout article or article of equipment of claim 1, wherein the lighting element is a seven-segment display.

18. The fitout article or article of equipment of claim 1, wherein the fitout article or article of equipment is configured for a use selected from a group consisting of: a cooking table, a laboratory table, a kitchen cabinet, a cooking appliance, a baking oven, a microwave device, a refrigerator, a grill, a steam cooker, a toaster, and an extractor hood.

19. The fitout article or article of equipment of claim 1, wherein the separating element is configured for a use selected from the group consisting of: a cooking table surface, a laboratory table surface, a kitchen working surface, a cooktop, a baking oven door, a microwave oven door, an item of furniture, a front of a door, and a front of a drawer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1a shows a chromaticity diagram of the CIExyY colour space.

(2) FIG. 1b shows an enlarged detail from FIG. 1a.

(3) FIG. 2 is a schematic diagram of an embodiment of a fitout article or article of equipment of the disclosure in cross section.

DETAILED DESCRIPTION

(4) FIG. 1a shows a chromaticity diagram of the CIExyY colour space with 2° standard observer)(CIExyY−2°. FIG. 1b shows an enlarged detail from this diagram.

(5) The figures depict the black-body curve as a dotted line, the two white regions W1 and W2 as dashed lines, the colour coordinates of the examples that are listed in Tables 2 and 4 and are suitable for use in an article of the invention as black squares, and examples from the prior art as black crosses.

(6) Every point on the black-body curve corresponds to the colour locus of the light emitted by a black-body radiator at a defined temperature, called the colour temperature. This curve is of particular relevance to human perception since the sun likewise corresponds to a black-body radiator and hence the colour of sunlight is on the black-body curve. According to the position of the sun, the colour locus moves between cooler and warmer colour loci; a colour temperature of 20 000 K corresponds to a clear sky and a temperature of 3500 K to evening sunlight shortly before the commencement of dusk. Colour loci at or close to the black-body curve are therefore perceived as white and particularly natural.

(7) The prior art described consists partly of the glass ceramic types specified in WO 2012076414 A1 and partly of commercially available glass ceramics from SCHOTT AG and Eurokera. These examples from the prior art are all outside the white region W1. As known from WO 2012076414 A1, the white region W1 can be covered by these glass ceramics only through the use of additional, complex compensation filters. However, the inventive examples cover this region even without such a filter. All the colour loci shown relate to a material thickness of 4 mm.

(8) The examples adopted from Tables 2 and 4 are all within the white region W1. Among these, all examples that contain less than 0.01% by weight of V2O5 in the glass ceramic, except for Example 17 which contains 0.02% by weight of CoO, are also within the white region W2. Therefore, the separating element preferably comprises glass ceramics that do not contain any V2O5 and CoO.

(9) FIG. 2 contains a schematic illustration of an article of the invention in cross section. The fitout article or article of equipment (1) shown for a kitchen or laboratory comprises a lighting element (2) and a separating element (3) that divides sections of an interior (4) of the article (1) from an exterior (5). The lighting element (2) is disposed in the interior (4) of the article (1) such that the light emitted by the lighting element (2) passes through a section of the separating element (3) and is perceptible by a user in the exterior (5) of the article (1). In the embodiment shown, the separating element (3) consists of a glass or glass ceramic substrate having a coefficient of thermal expansion CTE of 0 to 6×10-6/K in the temperature range between 20° C. and 300° C. In addition, the separating element (3) has a light transmittance of at least 0.1% and of less than 12% and a colour locus in the CIELAB colour space with the coordinates L* of 20 to 40, a* of −6 to 6 and b* of −6 to 6. The colour locus of D65 standard illuminant light after passing through the separating element (3) is within the white region W1.

(10) Fitout articles or articles of equipment of the invention for kitchens or laboratories may also contain a multitude of further components in their interior in addition to the lighting element.

(11) The articles may, for example, have one or more heating elements for heating an article, for example a pan, in the exterior or even in the interior of the article. These may especially be radiative heating elements, induction heating elements, gas heating elements or microwave generators.

(12) The articles may additionally include display elements, such as LCD or OLED screens or video projectors, and other lighting elements such as point, linear or areal light sources. These include, for example, LEDs, optical fibres and OLEDs. These light sources can emit in a particular colour, especially white, red, green and/or blue, or else variable colours. Between these lighting elements and the separating element, it is possible for additional colour filters to be provided, for example in order to be able to utilize a white LED for production of a coloured lighting effect with a defined colour locus and high colour saturation.

(13) Lighting elements may especially also be disposed in the hot region in the vicinity of heating elements. In this case, especially for the production of white lighting effects in the exterior of the article, it is advantageous that no temperature-sensitive black-body compensation filters are required.

(14) The articles may have cooling aggregates, for example Peltier elements, in thermal contact with the separating element in order to produce a cooling surface, for example for cooling of foods or chemicals, on the exterior-facing side of the separating element.

(15) The article may have various sensors, for example capacitative touch sensors for control or infrared sensors for gesture control or for measurement of the temperature of hot articles in the exterior, for example hot pans. In addition, the article may have microphones and cameras, for example for voice control or user recognition and authentication. This may be particularly advantageous in laboratories, for example, if the article may be used only by correspondingly trained personnel. Such sensors may have been printed, pressed, bonded or adhesive-bonded, or arranged in some other way, on the inside of the separating element. This is particularly true of touch sensors.

(16) The article may have various interfaces for communication, for example WLAN, Bluetooth or NFC modules or infrared interfaces. By means of such interfaces, the article can be connected, for example, either to the Internet or to other articles in its vicinity, for example pans with a corresponding interface or other electronic devices. More particularly, for control and communication, it can be connected to a mobile electronic device, such as a mobile phone or a tablet.

(17) The article may contain a device for wireless energy transmission from articles in the exterior, especially by means of induction coils and in accordance with the Qi standard.

(18) The separating element may have coatings on the exterior-facing side, for example anti-scratch layers, anti-reflection layers, anti-glare layers, decorative layers, easily cleanable layers or infrared-reflecting layers, provided that these do not alter the essential optical properties of the separating element.

(19) The separating element may have cutouts, for example recesses for sinks or down-draft fume hoods or bushings for pipelines.

(20) Likewise optionally, the separating element may have edge elaboration, for example a facet or a pencil finish.

(21) All these constituents may be present individually or in combination.

(22) TABLE-US-00008 TABLE 1 COMPOSITION AND PROPERTIES OF THE CRYSTALLIZABLE BASE GLASS 1 WITH BASE COMPOSITION Glass No. 1 Composition % by wt. Li.sub.2O 3.80 Na.sub.2O 0.60 K.sub.2O 0.25 MgO 0.29 CaO 0.40 SrO 0.02 BaO 2.23 ZnO 1.53 Al.sub.2O.sub.3 20.9 SiO.sub.2 65.0 TiO.sub.2 3.10 ZrO.sub.2 1.38 P.sub.2O.sub.5 0.09 SnO.sub.2 0.25 As.sub.2O.sub.3 0 MnO.sub.2 0.025 H.sub.2O content (β-OH) mm.sup.−1 0.39 Properties in glass form Transformation ° C. 662 temperature T.sub.g 10.sup.2 temperature ° C. 1742 Working temperature V.sub.A ° C. 1306 UDL temperature ° C. 1260

(23) TABLE-US-00009 TABLE 2 DOPANTS AND PROPERTIES OF THE INVENTIVE GLASS CERAMICS AND COMPARATIVE GLASS CERAMICS 1 AND 2 Example No. 1 2 3 4 5 Glass No. 1 1 2 3 4 Base glass 1 1 1 1 1 Dopants (% by wt.) Fe.sub.2O.sub.3 0.090 0.090 0.120 0.088 0.088 V.sub.2O.sub.5 0.023 0.023 0.010 0.013 MoO.sub.3 0.057 0.046 0.170 MnO.sub.2 0.025 0.025 0.025 0.025 0.025 Cr2O.sub.3 CeO.sub.2 WO.sub.3 Addition to batch Ceramization # 1 2 1 1 1 Properties in ceramized form Transmission, thickness 4 mm, D65 standard light, 2°  470 nm % 1.2 0.7 2.9 2.4 2.7  630 nm % 9.9 6.6 12.6 9.5 3.9  950 nm % 73.0 71.9 66.5 67.7 45.0 1600 nm % 76.4 76.3 70.9 75.7 70.3 3700 nm % 52.0 51.1 50.0 53.2 50.4 Colour coordinates (CIExyY) in transmission x 0.502 0.517 0.447 0.436 0.348 y 0.367 0.358 0.365 0.351 0.327 Brightness Y % 3.6 2.2 5.8 4.4 2.6 Colour distance d 0.193 0.207 0.139 0.125 0.035 Colour coordinates (CIELab) in reflectance L* 25.19 24.99 25.74 25.54 25.37 a* 0.28 0.04 0.39 0.47 −0.13 b* −0.66 −0.78 0.80 −0.54 −1.05 c* 0.72 0.78 0.89 0.72 1.06 ΔE 4.26 0.68 5.58 6.54 0.29 ΔG % 16.9 8.1 0.9 Flatness nm 8.4 10.0 4.4 4.0 1.7 transmission 630/470 630/470 630/470 630/470 630/538 (wavelength at max./min.) Scatter, thickness 4 mm, D65 standard light, 2° Visual assessment 1 1 1 1 1 Haze % 0.8 0.5 1.5 1.5 1.1 X-ray diffraction Main crystal phase HQMC HQMC HQMC HQMC HQMC Thermal expansion [10.sup.−6/K] CTE α.sub.20/300 −0.26 −0.29 CTE α.sub.20/700 0.13 0.17 Example No. 6 7 8 9 Glass No. 5 5 6 6 Base glass 1 1 1 1 Dopants (% by wt.) Fe.sub.2O.sub.3 0.088 0.088 0.062 0.062 V.sub.2O.sub.5 MoO.sub.3 0.170 0.170 0.150 0.150 MnO.sub.2 0.025 0.025 0.025 0.025 Cr.sub.2O.sub.3 CeO.sub.2 WO.sub.3 Addition to batch 50% 50% shards shards Ceramization # 1 2 1 2 Properties in ceramized form Transmission, thickness 4 mm, D65 standard light, 2°  470 nm % 2.3 2.0 1.2 1.5  630 nm % 3.9 2.3 1.9 1.6  950 nm % 41.5 35.3 36.7 34.2 1600 nm % 69.8 68.5 71.5 70.9 3700 nm % 51.8 52.0 52.4 52.4 Colour coordinates (CIExyY) in transmission x 0.338 0.329 0.323 0.315 y 0.318 0.311 0.305 0.299 Brightness Y % 2.0 1.6 1.4 1.2 Colour distance d 0.028 0.024 0.026 0.030 Colour coordinates (CIELab) in reflectance L* 24.99 25.91 24.98 a* −0.03 0.03 −0.02 b* −0.77 −0.79 −0.78 c* 0.77 0.79 0.78 ΔE 0.06 0.06 0.03 ΔG % 0.7 0.4 0.7 0.5 Flatness transmission nm 2.2 1.6 1.6 1.5 (wavelength at 630/ 630/ 630/ 630/ max./min.) 545 552 553 558 Scatter, thickness 4 mm, light, D65 standard 2° Visual assessment 1 1 1 1 Haze % 0.4 2.3 0.5 3.1 X-ray diffraction Main crystal phase HQMC HQMC HQMC HQMC Example No. 10 11 12 13 14 Glass No. 7 7 8 9 9 Base glass 1 1 1 1 1 Dopants (% by wt.) Fe.sub.2O.sub.3 0.062 0.062 0.061 0.062 0.062 V.sub.2O.sub.5 MoO.sub.3 0.150 0.150 0.150 0.040 0.040 MnO.sub.2 0.023 0.023 0.023 0.025 0.025 CeO.sub.2 0.060 0.060 WO.sub.3 0.050 Addition to batch 0.2% 0.2% sugar sugar without without nitrate nitrate Ceramization # 1 2 1 1 2 Properties in ceramized form Transmission, thickness 4 mm, D65 standard light, 2°  470 nm % 2.6 2.3 2.4 4.8 4.2  630 nm % 3.4 2.8 2.9 2.8 2.2  950 nm % 44.5 41.8 41.6 32.1 28.9 1600 nm % 73.7 73.1 73.3 75.7 74.7 3700 nm % 52.0 51.8 51.9 50.6 50.5 Colour coordinates (CIExyY) in transmission x 0.341 0.331 0.329 0.268 0.260 y 0.324 0.316 0.311 0.276 0.266 Brightness Y % 2.4 2.0 2.1 3.0 2.5 Colour distance d 0.028 0.023 0.024 0.069 0.082 Colour coordinates (CIELab) in reflectance L* 25.94 25.06 25.97 25.92 25.12 a* −0.03 −0.02 −0.05 −0.02 0.01 b* −0.76 −0.76 −0.76 −0.89 −0.93 c* 0.76 0.76 0.76 0.89 0.93 ΔE 0.12 0.1 0.09 0.24 2.11 ΔG % 1.0 0.7 0.9 1.3 0.8 Flatness nm 1.6 1.6 1.6 1.8 2.0 transmission 630/542 630/549 630/545 470/594 470/601 (wavelength at max./min.) Scatter, thickness 4 mm, D65 standard light, 2° Visual assessment 1 1 1 1 1 Haze % 0.5 1.0 1.0 0.8 2.1 X-ray diffraction Main crystal phase HQMC HQMC HQMC HQMC HQMC Thermal expansion [10.sup.−6/K] CTE α.sub.20/300 −0.21 −0.27 −0.25 −0.27 −0.32 CTE α.sub.20/700 0.17 0.11 0.15 0.14 0.09 Example No. 15 16 17 Glass No. 10 11 12 Base glass 1 1 1 Dopants (% by wt.) Fe.sub.2O.sub.3 0.062 0.062 0.061 V.sub.2O.sub.5 MoO.sub.3 0.150 0.150 0.150 MnO.sub.2 0.025 0.025 0.025 CoO 0.020 Cr.sub.2O.sub.3 0.020 Nd.sub.2O.sub.3 NiO 0.027 Addition to batch Ceramization # 1 1 1 Properties in ceramized form Transmission, thickness 4 mm, D65 standard light, 2°  470 nm % 0.3 1.6 2.0  630 nm % 2.6 2.1 2.0  950 nm % 43.5 36.6 39.7 1600 nm % 73.1 63.8 66.7 3700 nm % 51.9 50.8 50.4 Colour coordinates (CIExyY) in transmission x 0.475 0.341 0.315 y 0.452 0.309 0.257 Brightness Y % 1.5 1.3 1.2 Colour distance d 0.204 0.035 0.072 Colour coordinates (CIELab) in reflectance L* a* b* c* ΔE ΔG % Flatness transmission nm 7.8 2.0 2.4 (wavelength at 630/470 630/538 630/546 max./min.) Scatter, thickness 4 mm, D65 standard light, 2° Visual assessment 1 1 1 X-ray diffraction Main crystal phase HQMC HQMC HQMC Thermal expansion [10.sup.−6/K] CTE α.sub.20/300 −0.23 −0.23 CTE α.sub.20/700 0.17 0.15

(24) TABLE-US-00010 TABLE 3 COMPOSITIONS AND PROPERTIES OF CRYSTALLIZABLE GLASSES AND COMPARATIVE GLASS NO. 13 Glass No. 13 14 15 16 17 Composition (% by wt.) Li.sub.2O 3.83 3.71 4.03 3.31 3.82 Na.sub.2O 0.57 0.46 0.42 0.37 0.60 K.sub.2O 0.21 0.14 0.40 0.36 0.27 MgO 0.19 0.98 0.77 0.56 0.30 CaO 0.36 0.58 0.43 SrO 0.02 BaO 2.41 0.39 1.62 2.22 ZnO 1.41 1.58 0.56 1.92 1.52 Al.sub.2O.sub.3 20.2 20.9 20.1 21.4 20.9 SiO.sub.2 65.8 67.5 68.0 64.8 64.8 TiO.sub.2 3.02 2.47 4.69 3.20 4.10 ZrO.sub.2 1.39 1.69 1.35 0.43 P.sub.2O.sub.5 0.11 0.09 0.11 0.04 0.10 SnO.sub.2 0.30 0.23 0.24 0.24 0.25 As.sub.2O.sub.3 Fe.sub.2O.sub.3 0.090 0.060 0.062 0.099 0.061 V.sub.2O.sub.5 0.016 MoO.sub.3 0.150 0.140 0.160 0.150 MnO.sub.2 0.021 0.024 0.024 CoO 0.027 Addition to batch Properties in glass form Trans formation ° C. 674 675 667 temperature T.sub.g 10.sup.2 temperature ° C. 1729 1733 Working temperature ° C. 1310 1300 1294 V.sub.A UDL temperature ° C. 1280 1275 Glass No. 18 19 20 21 Composition (% by wt.) Li.sub.2O 2.67 3.67 3.73 3.82 Na.sub.2O 0.54 0.77 0.78 0.60 K.sub.2O 0.24 0.21 0.58 0.26 MgO 1.73 0.77 0.20 0.30 CaO 0.69 0.21 0.21 0.43 SrO 0.02 BaO 1.97 0.68 2.41 2.23 ZnO 1.65 0.90 0.93 1.48 Al.sub.2O.sub.3 20.0 22.2 20.0 21 SiO.sub.2 64.9 65.4 66.4 64.5 TiO.sub.2 5.04 4.26 2.83 3.08 ZrO.sub.2 0.54 1.40 1.40 P.sub.2O.sub.5 0.07 0.56 SnO.sub.2 0.24 0.19 0.39 0.23 As.sub.2O.sub.3 Fe.sub.2O.sub.3 0.091 0.085 0.033 0.062 V.sub.2O.sub.5 MoO.sub.3 0.099 0.079 0.045 0.040 MnO.sub.2 0.018 0.025 CoO Addition to batch 0.1% 0.2% 0.07% S sugar sugar without without nitrate nitrate Properties in glass form Transformation ° C. 671 668 temperature T.sub.g 10.sup.2 temperature ° C. Working temperature ° C. 1296 1299 V.sub.A UDL temperature ° C. 1265

(25) TABLE-US-00011 TABLE 4 PROPERTIES OF INVENTIVE GLASS CERAMICS AND COMPARATIVE GLASS CERAMIC OF EXAMPLE 18. Example No. 18 19 20 21 22 Glass No. 13 14 15 16 16 Ceramization # 2 2 1 1 2 Properties in ceramized form Transmission, thickness 4 mm, D65 standard light, 2°  470 nm % 1.9 2.5 0.8 5.8 5.2  630 nm % 10.8 7.8 1.7 8.3 7.0  950 nm % 72.0 55.4 37.6 53.4 50.9 1600 nm % 67.5 70.8 73.5 69.1 68.1 3700 nm % 49.4 49.9 52.4 46.3 46.4 Colour coordinates (CIExyY) in transmission x 0.476 0.414 0.393 0.344 0.338 y 0.322 0.359 0.350 0.325 0.320 Brightness Y % 3.5 4.2 1.0 5.9 5.0 Colour distance d 0.163 0.106 0.083 0.032 0.027 Colour coordinates (CIELab) in reflectance L* a* b* c* ΔE ΔG % 3.3 Flatness transmission n 8.0 3.1 2.3 1.6 1.6 (wavelength at m 630/ 630/ 630/ 630/ 630/ max./min.) 504 470 509 527 536 Scatter, thickness 4 mm, D65 standard light, 2° Visual assessment 1 1 1 1 1 Haze % 0.6 3.4 X-ray diffraction Main crystal phase HQMC HQMC HQMC HQMC HQMC Thermal expansion [10.sup.−6/K] CTE α.sub.20/300 −0.4 −0.45 −0.14 0.05 0.00 CTE α.sub.20/700 0.03 −0.15 0.14 0.34 0.27 Example No. 23 24 25 26 27 Glass No. 17 18 19 20 21 Ceramization # 1 1 2 2 1 Properties in ceramized form Transmission, thickness 4 mm  470 nm % 0.9 0.7 1.9 12.5 1.8  630 nm % 0.6 1.4 2.8 10.8 0.6  950 nm % 25.6 34.6 33.1 51.8 18.6 1600 nm % 73.5 71.3 69.9 82.7 73.2 3700 nm % 51.5 44.3 47.7 47.0 49.2 Colour coordinates (CIE) in transmission x 0.276 0.389 0.350 0.302 0.234 y 0.265 0.366 0.347 0.313 0.238 Brightness Y % 0.5 0.9 2.1 10.3 0.9 Colour distance d 0.089 0.085 0.041 0.019 0.120 Flatness nm 2.1 2.1 1.5 1.3 2.9 transmission 470/ 630/ 630/ 470/ 470/ (wavelength at 571 470 470 575 609 max./min.) Scatter, thickness 4 mm, D65 standard light, 2° Visual assessment 1 1 1 1 1 Haze % 3.3 2.5 2.9 1.1 0.2 X-ray diffraction Main crystal phase HQMC HQMC HQMC HQMC HQMC Thermal expansion [10.sup.−6/K] CTE α.sub.20/300 −0.13 1.23 0.23 −0.14 −0.28 CTE α.sub.20/700 0.23 1.49 0.51 0.26 0.12

(26) TABLE-US-00012 TABLE 5 PROPERTIES OF COATED UNCOLOURED GLASS CERAMICS Example No. B1 B2 Type Cermet Cermet Material MoSiOx MoSiOx Mo 43 14 Si 57 86 Colour black black Colour locus L* 29.0 27.4 a* −0.1 0.3 b* 0.8 0.1 x 0.43 0.45 y 0.40 0.41 Brightness Y 2.6 2.9 Transmission  470 nm [%] 1.1 1.0  630 nm [%] 4.4− 5.2  950 nm [%] 13.8 20.1 1600 nm [%] 40.5 51.4 3750 nm [%] 40.2 40.9 Haze [%] 0.3 0.3 Flatness of transmission 4.0 5.2 630/470 630/470 Other properties R [MΩ/□] >20 >20