Hot plate comprising a coating applied to the lower side thereof

Abstract

A cooktop plate includes a base plate having a lower side. A coating is formed on the lower side of the base plate and includes at least two metal layers and at least two dielectric layers in such a manner that a first color parameter a* or a second color parameter b* of the cooktop plate has a value greater than +10 or smaller than −10.

1 - 15 . (canceled) 
     
     
         16 . A cooktop plate, comprising:
 a base plate having a lower side; and   a coating formed on the lower side of the base plate and including at least two metal layers and at least two dielectric layers in such a manner that a first color parameter a* or a second color parameter b* of the cooktop plate has a value greater than +10 or smaller than −10.   
     
     
         17 . The cooktop plate of  claim 16 , wherein the coating is configured such that a degree of transmission of the cooktop plate in the wavelength range between 380 nm and 780 nm is less than 12%. 
     
     
         18 . The cooktop plate of  claim 16 , wherein the coating is configured such that a degree of transmission of the cooktop plate in the wavelength range between 380 nm and 780 nm is between 0.5% and 10%. 
     
     
         19 . The cooktop plate of  claim 16 , wherein the coating is configured such that a third color parameter L* has a value greater than 40. 
     
     
         20 . The cooktop plate of  claim 16 , wherein the coating is configured such that a third color parameter L* has a value between 40 and 70. 
     
     
         21 . The cooktop plate of  claim 16 , wherein the coating has a number of metal layers which is 2 or 3. 
     
     
         22 . The cooktop plate of  claim 16 , wherein the coating has a number of dielectric layers which is between 2 and 4. 
     
     
         23 . The cooktop plate of  claim 16 , wherein the coating includes a protective layer as a lower termination. 
     
     
         24 . The cooktop plate of  claim 23 , wherein the protective layer is a protective anti-oxidation layer. 
     
     
         25 . The cooktop plate of  claim 16 , wherein the metal layers and the dielectric layers respectively have layer thicknesses less than or equal to 300 nm. 
     
     
         26 . The cooktop plate of  claim 16 , wherein the metal layers and the dielectric layers respectively have layer thicknesses less than or equal to 100 nm. 
     
     
         27 . The cooktop plate of  claim 16 , wherein the at least two metal layers of the coating have different layer thicknesses or the at least two dielectric layers of the coating have different layer thicknesses. 
     
     
         28 . The cooktop plate of  claim 16 , wherein the metal layers and the dielectric layers of the coating are formed by sputtering on the lower side. 
     
     
         29 . The cooktop plate of  claim 28 , wherein the sputtering includes magnetron sputtering. 
     
     
         30 . The cooktop plate of  claim 16 , wherein one of the metal layers is made of a material selected from the group consisting of the elements SSt, Mo, Ni, Cr, Nb, V, Ti, Ta, Si, Al, Cu, W, and a combination of at least two of said elements. 
     
     
         31 . The cooktop plate of  claim 16 , wherein one of the dielectric layers is made of a material selected from the group consisting of the compounds SnO x , ZnO x , TiO x , AlO x , SiO x , NbO x , TaO x , SiN x , AlN x , TiN x , CrN x , and a combination of at least two of said compounds. 
     
     
         32 . The cooktop plate of  claim 19 , wherein a first one of the dielectric layers of the coating includes SnO x  with a layer thickness of 76 nm, with the first dielectric layer being followed by at least a first one of the metal layers which includes SSt with a layer thickness of 18 nm, followed by a second one of the dielectric layers which includes SnO x  with a layer thickness of 78 nm, followed by at least a second one of the metal layers which includes SSt with a layer thickness of 26 nm, said coating having a third dielectric layer which includes SnO x  with a layer thickness of 50 nm and is applied upon the second metal layer, wherein the value of the first color parameter a* is 4, the value of the second color parameter b* is −35, and the value of the third color parameter L* is 46. 
     
     
         33 . The cooktop plate of  claim 19 , wherein a first one of the dielectric layers of the coating includes SnO x  with a layer thickness of 100 nm, with the first dielectric layer being followed by at least a first one of the metal layers which includes SSt with a layer thickness of 14 nm, followed by a second one of the dielectric layers which includes SnO x  with a layer thickness of 100 nm, followed by at least a second one of the metal layers which includes SSt with a layer thickness of 35 nm, said coating having a third dielectric layer which includes SnO x  with a layer thickness of 50 nm and is applied upon the second metal layer, wherein the value of the first color parameter a* is −31, the value of the second color parameter b* is 0, and the value of the third color parameter L* is 67. 
     
     
         34 . The cooktop plate of  claim 19 , wherein a first one of the dielectric layers of the coating includes SnO x  with a layer thickness of 17 nm, with the first dielectric layer being followed by at least a first one of the metal layers which includes Cu with a layer thickness of 33 nm, followed by a second one of the dielectric layers which includes SnO x  with a layer thickness of 66 nm, followed by at least a second one of the metal layers which includes SSt with a layer thickness of 25 nm, said coating having a third dielectric layer which includes SnO x  with a layer thickness of 50 nm and is applied upon the second metal layer, wherein the value of the first color parameter a* is −35, the value of the second color parameter b* is 5, and the value of the third color parameter L* is 60. 
     
     
         35 . The cooktop plate of  claim 19 , wherein a first one of the dielectric layers of the coating includes SnO x  with a layer thickness of 29 nm, with the first dielectric layer being followed by at least a first one of the metal layers which includes SiAl with a layer thickness of 45 nm, followed by a second one of the dielectric layers which includes SnO x  with a layer thickness of 41 nm, followed by at least a second one of the metal layers which includes SSt with a layer thickness of 22 nm, said coating having a third dielectric layer which includes SnO x  with a layer thickness of 50 nm and is applied upon the second metal layer, wherein the value of the first color parameter a* is 9, the value of the second color parameter b* is −40, and the value of the third color parameter L* is 64.