Process for producing a hotplate for a hob

Patent metadata

Field	Value
Publication number	US-10350709-B2
Application number	US-201113990807-A
Country	US
Kind code	B2
Filing date	Dec 13, 2011
Priority date	Dec 16, 2010
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

In a method for embodying a hotplate for a hob, at least one metallic layer and a further layer under the metallic layer are formed on an underside of the hotplate. After applying the at least one metallic layer and the further layer, at least one region of the metallic layer is changed by a laser light of a laser beam so that the further layer is recognized when viewing the hob on a topside.

First claim

The invention claimed is:

1. A method for embodying a hotplate for a hob, comprising:
forming at least one metallic layer and a further layer under the at least one metallic layer on an underside of the hotplate; and
after the forming the at least one metallic layer and the further layer, forming at least one cooking zone on the hotplate by irradiating at least one region of the at least one metallic layer with a laser light of a laser beam directed to strike a topside of the hotplate and to radiate through the hotplate and moving the laser light with respect to the at least one region of the at least one metallic layer such that all of the at least one region of the at least one metallic layer disposed between the hotplate and the further layer is completely continuously changed with each movement of the laser light so that the further layer is recognized when viewing the hob from a topside,
wherein the completely continuously changing changes a material property of the at least one region of the at least one metallic layer, without removing the at least one region of the at least one metallic layer, such that the further layer is visible from the topside of the hotplate.

2. The method of claim 1 , wherein the further layer is a color coating.

3. The method of claim 1 , further comprising changing the at least one region of the at least one metallic layer only after the at least one metallic layer and the further layer have completely been applied on the underside of the hotplate.

4. The method of claim 1 , wherein the laser light is focused on the topside.

5. The method of claim 1 , wherein the at least one metallic layer has a thickness of less than 130 nm.

6. The method of claim 1 , wherein the at least one metallic layer has a thickness between 20 nm and 100 nm.

7. The method of claim 1 , wherein the further layer has a thickness of less than 250 μm.

8. The method of claim 1 , wherein the further layer has a thickness between 100 μm and 200 μm.

9. The method of claim 1 , wherein the laser light is moved at a speed of 2000 mm/s.

10. The method of claim 1 , wherein the laser light is generated with a pulse frequency of 110 kHz.

11. The method of claim 1 , wherein the laser light is generated with a wavelength of 532 nm.

12. The method of claim 1 , wherein the at least one metallic layer has a thickness between 20 nm and 100 nm and the further layer has a thickness between 100 μm and 200 μm,
the method further comprising changing the at least one region of the at least one metallic layer only after the at least one metallic layer and the further layer have completely been applied on the underside of the hotplate,
wherein the at least one region of the at least one metallic layer is changed by irradiating the at least one metallic layer with the laser light directed to strike the topside of the hotplate and to radiate through the hotplate and the laser light is focused on the topside,
wherein the laser light is moved at a speed of 2000 mm/s, and
wherein the at least one region of the at least one metallic layer is changed in lines, which have a line width of less than 500 μm.

13. The method of claim 1 , wherein the at least one metallic layer and the further layer under the at least one metallic layer are formed on an entire underside of the hotplate.

14. The method of claim 3 , wherein the at least one region of the at least one metallic layer is removed in lines, which have a line width of less than 500 μm.

15. The method of claim 3 , wherein the at least one region of the at least one metallic layer is removed in lines, which have a line width of 400 μm.

16. The method of claim 12 , wherein the at least one region of the at least one metallic layer is changed in lines, which have a line width of 400 μm.

17. The method of claim 12 , wherein the laser light is generated with a wavelength of 532 nm.

18. The method of claim 12 , wherein the laser light is generated with a pulse frequency of 110 kHz.

19. The method of claim 12 , wherein the at least one metallic layer is formed directly on the underside of the hotplate, and
wherein one of the at least one metallic layer and the further layer is formed by sputtering.

20. A method for manufacturing a hotplate for a hob, comprising:
applying at least one metallic layer on an entire underside of the hotplate;
applying at least one dielectric color coating consecutively to an entire underside of the at least one metallic layer such that the at least one metallic layer is between the hotplate and the at least one dielectric color coating; and
forming at least one cooking zone on the hotplate by applying a laser light of a laser beam to at least one region of the at least one metallic layer and moving the laser light with respect to the at least one region of the at least one metallic layer such that all of the at least one region of the at least one metallic layer disposed between the hotplate and the at least one dielectric color coating is completely continuously changed with each movement of the laser light so that the at least one dielectric color coating is visible from a topside of the hotplate,
wherein the laser light is applied and completely continuously changes a material property of the at least one metallic layer, without removing the at least one metallic layer, such that the at least one dielectric color coating is visible from the topside of the hotplate.

21. The method of claim 20 , further comprising changing the at least one region of the at least one metallic layer only after the at least one metallic layer and the further layer have completely been applied on the underside of the hotplate.

22. The method of claim 20 , wherein the laser light is focused on the topside.

23. The method of claim 20 , wherein the at least one metallic layer has a thickness of less than 130 nm.

24. The method of claim 20 , wherein the at least one metallic layer has a thickness between 20 nm and 100 nm.

25. The method of claim 20 , wherein the further layer has a thickness of less than 250 μm.

26. The method of claim 20 , wherein the further layer has a thickness between 100 μm and 200 μm.

27. The method of claim 20 , wherein the laser light is moved at a speed of 2000 mm/s.

28. The method of claim 20 , wherein the laser light is generated with a pulse frequency of 110 kHz.

29. The method of claim 20 , wherein the laser light is generated with a wavelength of 532 nm.

30. The method of claim 20 , wherein the dielectric color coating is applied directly to the at least one metallic layer.

31. The method of claim 21 , wherein the at least one region of the at least one metallic layer is removed in lines, which have a line width of less than 500 μm.

32. The method of claim 21 , wherein the at least one region of the at least one metallic layer is removed in lines, which have a line width of 400 μm.

Assignees

• Alaman Aguilar Jorge
• Bunuel Magdalena Miguel Angel
• Ester Sola Francisco Javier
• Garcia Jimenez Jose Ramon
• Garcia Martinez Jose Andres
• Perez Cabeza Pilar
• Planas Layunta Fernando
• Bsh Hausgeraete Gmbh

Inventors

• Alaman Aguilar Jorge
• Buñuel Magdalena Miguel Angel
• Ester Sola Francisco Javier
• Garcia Jimenez Jose Ramon
• Garcia Martinez Jose Andres
• Perez Cabeza Pilar
• Planas Layunta Fernando

Classifications

• B23K26/55

  for creating voids inside the workpiece, e.g. for forming flow passages or flow patterns · CPC title

• C03C17/3605

  Coatings of the type glass/metal/inorganic compound · CPC title

• B23K26/361

  for deburring or mechanical trimming (B23K26/351 takes precedence) · CPC title

• B23K26/364

  for making a groove or trench, e.g. for scribing a break initiation groove · CPC title

• B23K26/40

  taking account of the properties of the material involved · CPC title