Induction cooking hob with illumination equipment

Abstract

An induction cooking hob (1) with illumination equipment includes a cover element (2) arranged at the top side of the induction cooking hob and including at least one heating zone, a chassis (5) arranged below the cover element (2) and at least one induction coil unit (3) having an induction coil (10). The induction coil unit (3) is arranged below the at least one heating zone. According to the invention, a light emitting diode (4) is mounted to the center of the at least one induction coil unit (3). Thermal conductive contact between the light emitting diode (4) and the chassis (5) is provided by a spring element (12) pressing at least a surface of the light emitting diode (4) onto the chassis (5).

Claims

1. Induction cooking hob with illumination equipment, comprising: a cover arranged at a top side of the induction cooking hob and including at least one heating zone, a chassis arranged below the cover and at least one induction coil unit having an induction coil, said induction coil unit being arranged below the at least one heating zone, wherein a light emitting diode is mounted to a center of the at least one induction coil unit, wherein thermal conductive contact between the light emitting diode and the chassis is provided by a spring pressing at least a surface of the light emitting diode onto the chassis.

2. Induction cooking hob according to claim 1, wherein the thermal conductive contact between the light emitting diode and the chassis includes a heat conducting tape or a heat conducting foil arranged between the light emitting diode and the chassis.

3. Induction cooking hob according to claim 1, wherein the spring is made from silicone.

4. Induction cooking hob according to claim 1, wherein the spring is arranged as a deformable gaiter, half sphere or cone.

5. Induction cooking hob according to claim 1, wherein the light emitting diode is snap-fitted to a holder mounted in the center of the at least one induction coil unit.

6. Induction cooking hob according to claim 5, wherein the holder is made from silicon.

7. Induction cooking hob according claim 4, wherein the spring is integrated with a holder mounted in the center of the at least one induction coil unit to form one piece.

8. Induction cooking hob according to claim 1, wherein the spring is a separate element.

9. Induction cooking hob according to claim 7, wherein the spring is arranged as a coil spring, a helical spring, a leaf spring, a plate spring or a flat spring.

10. Induction cooking hob according to claim 7, wherein the spring is mounted to a circuit board or an induction unit base plate.

11. Induction cooking hob according to claim 1, wherein the light emitting diode is mounted to a bottom part of the at least one induction coil unit.

12. Induction cooking hob according to claim 1, wherein the cover is a glass ceramic panel or glass ceramic plate.

13. Induction cooking hob according to claim 1, wherein the light emitting diode is directly mounted to the at least one induction coil unit.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) In the following, the invention is described in more detail with reference to drawings, wherein

(2) FIG. 1 illustrates an induction cooking hob according to an embodiment of the invention in an exploded view;

(3) FIG. 2 illustrates an induction coil unit of the induction cooking hob of FIG. 1 in a sectional view;

(4) FIG. 3 illustrates the induction coil unit of FIG. 2 in a perspective view;

(5) FIG. 4 illustrates another perspective view of the induction coil unit;

(6) FIG. 5 illustrates a light emitting diode adapted to be mounted to the center of the induction coil unit of FIG. 2 in perspective view;

(7) FIG. 6 illustrates another perspective view of the light emitting diode of FIG. 5;

(8) FIG. 7 illustrates a holder for mounting the light emitting diode of FIG. 5 and FIG. 6 to the center of the induction coil unit of FIG. 2 in a perspective view;

(9) FIG. 8 illustrates another perspective view of the holder of FIG. 7

(10) FIG. 9 illustrates the center of the induction coil including the light emitting diode and the holder in an exploded view.

(11) Corresponding elements or parts are indicated in all figures with same reference signs or reference numerals.

DETAILED DESCRIPTION OF INVENTION

(12) FIG. 1 shows an induction cooking hob 1 according to a possible embodiment of the invention in an exploded view. The induction cooking hob comprises a cover element 2 made from glass ceramic. The cover element 2 (also: glass ceramic panel) forms the work-top of the induction cooking hob. The cover element 2 includes four different heating zones that are defined by four induction coil units 3 arranged below the respective areas of the cover element 2. The cover element 2 does not exhibit any printed markings indicating the location of the different heating zones. The heating zones are indicated by illumination equipment, in particular by light emitting diodes 4 arranged below the cover element 2. Each light emitting diode 4 indicating a heating zone is mounted to the center of the corresponding induction coil unit 3.

(13) The induction coil units 3 are mounted to a chassis 5 of the induction cooking hob 1. The chassis 5 is made from aluminium and is capable of conducting heat. A surface of each light emitting diode 4 is in physical contact with the chassis 5 such that heat generated during operation of the light emitting diodes 4 may be dissipated to the chassis 5. Operation of the induction cooking hob 1 is controlled by means of a user interface 6.

(14) FIG. 2 shows the induction coil unit 3 in a sectional view. FIG. 3 shows the induction coil unit 3 as viewed from above. FIG. 4 shows the induction coil unit 3 as viewed from below.

(15) The induction coil unit 3 comprises an induction top plate 8 an induction unit base plate 9 forming a casing. An induction coil 10 is arranged between the induction unit top plate 8 and the induction unit base plate 9. A holder 11 for the light emitting diode 4 is mounted to the center of the induction coil unit 1 and the induction coil 10. The holder is made from silicone and may comprise a light reflecting layer or coating on its inside.

(16) FIG. 7 shows the holder 11 as viewed from above. FIG. 8 shows the holder 11 as viewed from below. The light emitting diode 4 is illustrated in detail in FIG. 5 and FIG. 6. FIG. 5 shows the light emitting diode 4 as viewed from above. FIG. 6 shows the light emitting diode 4 as viewed from below.

(17) As best seen in FIG. 2 or FIG. 9, the light emitting diode 4 is mounted to a lower part of the holder 11 and the induction coil unit 3 such that it is located at a distance to the induction unit top plate 8 with respect to a vertical direction V. The holder 11 includes cone-shaped sections that act as spring elements 12 (see also FIG. 7) and brackets 13 for mounting the light emitting diode 4 that is affixed on top of a circuit board 14.

(18) The circuit board 14 has projections 15 that are received in the brackets 13. The cone-shaped sections that act as spring elements 12 are deformable and exert a biasing force on the circuit board 14. The projections 15 are clamped between the spring elements 12 and the brackets 13. In other words, the light emitting diode 4 is mounted to the lower part of the holder 11 by means of a snap-fit or force-fit.

(19) The spring elements 12 are arranged in a manner that the circuit board 14 is urged downwardly with respect to the vertical direction V such that an underside 16 of the circuit board 14 is in contact with the chassis 5 in the assembled state. In the assembled state, the induction coil unit 3 is clamped between the cover element 2 and the chassis 5 of the induction cooking hob 1. A heat conducting tape 17 arranged, in particular by means of adhesion, covers a substantial part of the underside 16. The heat conducting tape 17 is in direct physical contact with both the chassis 5 and the underside 16 of the circuit board 14 to provide a thermal conductive connection between these elements. Heat generated by the light emitting diode 4 during operation may thus be dissipated to the chassis.

(20) FIGS. 2 to 4 illustrates the induction coil unit 3 in state before it is assembled in the induction cooking hob 1. Four support elements 18 having the shape of cups are arranged around the periphery of the generally annular induction coil unit 3. The support elements 18 are configured to be placed onto the chassis 5. The support elements 18 are made from a resilient material such as rubber or silicon and are deformed during assembly when the induction coil units 3 are clamped between the cover element 2 and the chassis 5 (see also FIG. 1). In the assembled state, a heat dissipating thermal connection between the light emitting diode 4 and the chassis 5 is provided by a direct contact of the heat conducting tape 17 adhered to the underside 16 of the circuit board 14 and the chassis 5.

(21) As best seen in FIG. 3, the induction unit top plate 8 exhibits three cutouts 20 extending from the center of the induction coil unit 3 in radial directions. During operation, the cutouts 20 are illuminated by light emitting from the light emitting diode located in the center of the induction coil unit 3. The illuminated cutouts 20 indicate heating zones, in particular active heating zones.

(22) As best seen in FIG. 5 or FIG. 6, the circuit board 14 of the light emitting diode 4 is contacted by wires 19. The protrusions 15 on side of the circuit board 14 have a shape that slightly differs from the shape of the protrusions 15 located on the opposite side of the circuit board 14. The geometrical layout of the brackets 13 corresponds to the geometric shape of the protrusions 15 respectively received therein such that the light emitting diode 4 may only be mounted to the holder 11 in the proper orientation.

(23) As best seen in FIG. 7 or FIG. 8, the holder 11 has a generally annular shape. An inner surface may be provided with a light reflecting surface 21 or coating.

(24) Heating zones may be indicated by light illuminated by the light emitting diodes 4 during operation. The snap-fit for the light emitting diode 4 provided by the holder 11 allows for an easy and quick assembly and replacement on the induction coil unit 3 including the light emitting diode 4 as a single unit. A separate and costly affixture of the light emitting diode 4 to the chassis 5, in particular by means of adhesion, at the proper location may be avoided. The induction cooking hob 1 may thus be easily assembled.

LIST OF REFERENCE NUMERALS

(25) 1 induction cooking hob 2 cover element 3 induction coil unit 4 light emitting diode S chassis 6 user interface 8 induction unit top plate 9 induction unit base plate 10 induction coil 11 holder 12 spring elements 13 bracket 14 circuit board 15 protrusion 16 underside 17 heat conducting tape 18 support element 19 wire 20 cutout 21 surface V vertical direction