# US 2014/0197152 A1 · Hot plate comprising a coating applied to the lower side thereof

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- Number: US 2014/0197152 A1
- Document ID: US20140197152A1
- Status: Published application
- Kind: A1
- Application number: 14/007,725
- Filed: 2012-03-09
- Published: 2014-07-17
- Earliest claimed: 2011-03-30
- Assignees: BSH Bosch und Siemens Hausgerate GmbH
- Inventors: Rafael Alonso Esteban; Miguel Angel Bunuel Magdalena; Enrique Carretero Chamarro; Francisco Javier Ester Sola; Francisco Javier Pelayo Zueco; Pilar Perez Cabeza; Fernando Planas Layunta; Jesus Mario Subias Domingo; Francisco Villuendas Yuste
- Web page: https://patentgrep.com/patent/US20140197152A1

## CPC

- F24C 15/102: {electrically heated}
- C03C 17/36: at least one coating being a metal
- C03C 17/3613: {Coatings of type glass/inorganic compound/metal/inorganic compound/metal/other}
- C03C 17/3649: {made of metals other than silver}
- C03C 23/0025: {by a laser beam}
- H05B 3/74: Non-metallic plates {, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits}
- F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## 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.

## Claims

### Claim at position 1

1-15. (canceled)

### Claim 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.

### Claim 17 (depends on 16)

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%.

### Claim 18 (depends on 16)

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%.

### Claim 19 (depends on 16)

The cooktop plate of claim 16, wherein the coating is configured such that a third color parameter L* has a value greater than 40.

### Claim 20 (depends on 16)

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.

### Claim 21 (depends on 16)

The cooktop plate of claim 16, wherein the coating has a number of metal layers which is 2 or 3.

### Claim 22 (depends on 16)

The cooktop plate of claim 16, wherein the coating has a number of dielectric layers which is between 2 and 4.

### Claim 23 (depends on 16)

The cooktop plate of claim 16, wherein the coating includes a protective layer as a lower termination.

### Claim 24 (depends on 23)

The cooktop plate of claim 23, wherein the protective layer is a protective anti-oxidation layer.

### Claim 25 (depends on 16)

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.

### Claim 26 (depends on 16)

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.

### Claim 27 (depends on 16)

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.

### Claim 28 (depends on 16)

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.

### Claim 29 (depends on 28)

The cooktop plate of claim 28, wherein the sputtering includes magnetron sputtering.

### Claim 30 (depends on 16)

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.

### Claim 31 (depends on 16)

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 SnOx, ZnOx, TiOx, AlOx, SiOx, NbOx, TaOx, SiNx, AlNx, TiNx, CrNx, and a combination of at least two of said compounds.

### Claim 32 (depends on 19)

The cooktop plate of claim 19, wherein a first one of the dielectric layers of the coating includes SnOx 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 SnOx 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 SnOx 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.

### Claim 33 (depends on 19)

The cooktop plate of claim 19, wherein a first one of the dielectric layers of the coating includes SnOx 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 SnOx 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 SnOx 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.

### Claim 34 (depends on 19)

The cooktop plate of claim 19, wherein a first one of the dielectric layers of the coating includes SnOx 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 SnOx 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 SnOx 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.

### Claim 35 (depends on 19)

The cooktop plate of claim 19, wherein a first one of the dielectric layers of the coating includes SnOx 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 SnOx 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 SnOx 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.