DE102023108263A1 - Cooking appliance light - Google Patents

Abstract

Described and illustrated is a cooking appliance light for arrangement in a cooking wall recess of a cooking appliance, in particular an oven, steam cooker or microwave cooking appliance, - with a sleeve which is provided with a support flange at its first end and is intended with the first end for arrangement on a cooking chamber wall, - with a longitudinal central axis which passes through the cooking appliance light parallel to the sleeve wall, - with locking means which are arranged downstream of the support flange in the direction of the second sleeve end, wherein the cooking appliance wall is intended for arrangement between the support flange and the locking means, - with holding means at the second sleeve end, - with a lighting unit which comprises at least one LED lighting means on a cooling body and is arranged by the holding means at the second sleeve end, - with a cover glass which closes the sleeve at its first end, wherein - the cover glass forms a light entry surface on its inner side facing the lighting means and a light exit surface on its outer side facing away from the lighting means and facing a cooking chamber, wherein the The light entry surface of the cover glass is designed as an optically effective surface which influences the light emitted by the lamp in the direction of the cover glass and passing through the cover glass in its direction of emergence.

Description

• - mit einer Hülse, die an ihrem ersten Ende mit einem Auflageflansch versehen ist und mit dem ersten Ende zur Anordnung an einer Garraumwand vorgesehen ist,
• - mit einer Längsmittelachse, die hülsenwandparallel die Gargeräteleuchte durchsetzt,
• - mit Rastmitteln, die dem Auflageflansch in Richtung des zweiten Hülsenendes nachgeordnet sind, wobei die Gargerätewand zur Anordnung zwischen dem Auflageflansch und den Rastmitteln vorgesehen ist,
• - mit Haltemitteln am zweiten Hülsenende,
• - mit einer Leuchtmitteleinheit, die wenigstens ein LED-Leuchtmittel auf einem Kühlkörper umfasst und von den Haltemitteln am zweiten Hülsenende angeordnet sind,
• - mit einem Abdeckglas, welches die Hülse an ihrem ersten Ende verschließt, wobei
• - das Abdeckglas auf seiner zum Leuchtmittel gewandten Innenseite eine Lichteintrittsfläche und auf seiner dem Leuchtmittel abgewandten und einem Garraum zugewandten Außenseite eine Lichtaustrittfläche ausbildet.

The invention relates to a cooking appliance light for arrangement in a cooking wall recess of a cooking appliance, in particular an oven, steam cooker or microwave cooking appliance,

• - with a sleeve which is provided with a support flange at its first end and is intended with the first end for arrangement on a cooking chamber wall,
• - with a longitudinal central axis that passes through the cooking appliance light parallel to the sleeve wall,
• - with locking means arranged downstream of the support flange in the direction of the second sleeve end, the cooking appliance wall being provided for arrangement between the support flange and the locking means,
• - with holding means at the second sleeve end,
• - with a lamp unit which comprises at least one LED lamp on a heat sink and is arranged by the holding means at the second sleeve end,
• - with a cover glass which closes the sleeve at its first end, whereby
• - the cover glass forms a light entry surface on its inner side facing the lamp and a light exit surface on its outer side facing away from the lamp and facing a cooking chamber.

Typical cooking appliance lights are made from EN 20 2019 106 170 U1 They are used to illuminate the cooking chamber of a cooking appliance, such as an oven, steam cooker or microwave oven. Such lights have to meet high temperature stability requirements. Cooking temperatures of up to 300° are possible in ovens in particular. Ovens capable of pyrolysis heat the cooking chamber to up to 500 °C during the pyrolysis process.

In addition, cooking fumes are produced when food is being cooked, which usually contain fat and can have a corrosive effect when combined with high temperatures. In addition, there is the moisture load caused by cooking fumes. This is naturally particularly high in steam cookers, but also occurs to a lesser extent in ovens and microwave ovens. Depending on the intended use, the lamp must be able to withstand such influences or - particularly in the case of steam cookers - must be specially sealed.

The use of LED lamps also requires special cooling management. Since LED lamps are particularly temperature-sensitive, they must be as far away from the cooking chamber as possible, which must be taken into account when designing and constructing cooking appliance lights.

The lighting of the cooking chamber serves, among other things, to enable the user to observe and inspect the cooking process from the outside through the appliance door. This requires the cooking chamber to be as well illuminated as possible. However, this requirement contradicts the requirements defined by the use of LED lamps. The temperature sensitivity of the LED lamps requires - as described in detail - that they be as far away from the cooking chamber wall as possible, so that a comparatively long beam path is created. In order to avoid light loss when bridging the distance between the lamp and the cooking chamber wall, the light emitted by the LED lamp is regularly fed into the cooking chamber via light guides.

Despite all the technical advantages, this technology has the disadvantage that the light guide is usually an expensive component. In addition, it must be encapsulated when it is routed between the cooking chamber wall and the appliance wall in order to avoid contact with the insulation there. Contact between the light guide and the insulation would lead to undesirable and disadvantageous light extraction.

In addition, the openings for the cooking chamber walls must be regularly adapted to the use of light guides. This requires a great deal of effort in cooking appliance production, as new manufacturing tools must be produced to form the cooking appliance walls.

The object of the invention is therefore to create a cooking appliance light which is designed without a light guide between the LED light source and the cooking chamber wall and yet ensures good cooking chamber illumination.

The object of the invention is achieved by a cooking appliance light with the features of claim 1, in particular with its characterizing features, according to which the light entry surface of the cover glass is designed as an optically effective surface which influences the light emitted by the lamp in the direction of the cover glass and passing through the cover glass in its direction of emission.

The cooking appliance light according to the invention advantageously uses the fixing known from the prior art by means of a metal sleeve which is anchored in a cutout in the cooking chamber wall. The sleeve itself is closed off from the cooking chamber by a cover glass. In this respect, this is known from the use of cooking appliance lights with conventional light sources, in particular with incandescent filament lamps.

The invention then uses the sleeve as a spacer element and holding part for the LED light source. The LED light source is arranged at the end of the sleeve facing away from the cooking chamber wall and is preferably fixed there outside the sleeve. In this way, a cooling air flow can be guided past the LED light source and sufficient heat dissipation can be ensured.

Another special feature of the invention is that the cover glass, and in particular its inside, is used to influence the light exiting the cover glass, in particular to scatter the light over a wide area as it exits the cover glass. This is particularly advantageous if the LED light source itself is provided with an optic that focuses the light in order to emit the light through the sleeve to the cover glass with as little loss as possible. The optic is usually positioned immediately downstream of the LED light source in the direction of the light exit, i.e. close to the LED.

The light entry surface of the cover glass, i.e. the optically effective surface of the cover glass, is preferably concavely curved and in this way fans out the incoming light rays.

The concave curvature of the optically effective surface of the cover glass preferably has its apex in the center of the cover glass, i.e. where the longitudinal center axis of the cooking appliance light passes through the cover glass.

Furthermore, the concave surface extends in particular into the area of a mutual contact surface of the sleeve and cover glass. In this way, the entire inner surface of the cover glass can be used as an optically effective surface. It goes without saying that any neck section of the cover glass, which can form an external thread for fastening in the sleeve, remains unaffected by this.

The light exit surface of the cover glass is preferably directed orthogonally to the longitudinal central axis. It can be flat or structured, whereby structuring of the light exit surface can complement the optically effective inner surface of the cover glass.

Further advantages of the invention are also set out in the following description of an embodiment.

• 1 eine Explosionsdarstellung einer erfindungsgemäßen Gargeräteleuchte,
• 2 die Gargeräteleuchte nach 1 in zusammengesetzten Zustand,
• 3 die Gargeräteleuchte nach 1 in Ansicht von oben,
• 4 die Darstellung der Gargeräteleuchte in Explosionsansicht gemäß Schnittlinie IV-IV in 3,
• 5 die Darstellung der zusammengesetzten Gargeräteleuchte nach 2 in einem Längsschnitt gemäß Schnittlinie IV-IV in 3.

Show it:

• 1 an exploded view of a cooking appliance light according to the invention,
• 2 the cooking appliance light after 1 in assembled state,
• 3 the cooking appliance light after 1 in view from above,
• 4 the representation of the cooking appliance light in exploded view according to section line IV-IV in 3 ,
• 5 the representation of the assembled cooking appliance light according to 2 in a longitudinal section according to section line IV-IV in 3 .

In the figures, a cooking appliance lamp according to the invention is provided with the reference number 10.

The cooking appliance light is in 1 initially shown in an exploded view. It initially comprises a lighting unit 11, consisting of a circuit board 12 with an LED light source 13 arranged thereon. The light emitted by the LED light source is radiated along a light exit direction X in the direction of a cover glass 14.

The circuit board 12 has connection terminals 15, which are used to connect connecting conductors. The circuit board 12 itself is fixed to a heat sink 16 by means of two fastening elements 17. Downstream of the LED light source 13 in the light exit direction X is an approximately pot-shaped holder 18 for an optic 19 in the form of a converging lens.

A holding part 20 is used to hold the circuit board 12, the heat sink 16 and the converging lens 19 and to fix them to a sleeve 21. The holding part 20 has fastening stamps 30, the free ends of which point away from the cover glass 14 and in this case hold the heat sink 16, on which the circuit board 12 with the LED light source 13 is attached. The optics holder 18 with the converging lens 19, however, is inserted into the holding part 20. The holding part 20 is also provided with three ring-disk-like slats 22, which are spaced apart from one another in the light exit direction X and form a ventilation gap between them. The free ring diameter of the slats 22 expands in the light exit direction X.

The sleeve 21 has a first end close to the cover glass, which is provided with a support flange 23. Latching wings 25 are notched out of the sleeve wall 24. The second end of the sleeve 21 facing away from the cover glass 14 has tabs 26 projecting in the direction of the holding part 20, each of which has a latching opening 27. The tabs 26 engage in tab receptacles 28 of the holding part 20. Each tab holder 28 has a locking projection 29 which extends through the locking opening 27 of each tab 26.

The cover glass 14 has a neck 31 directed towards the sleeve 21. The neck 31 is provided with an external thread 32. The external thread 32 interacts with thread sections 33 of the sleeve 21, which are produced by impressions in the sleeve wall 24. The interaction of the external thread 32 and thread sections 33 allows the cover glass 14 to be easily screwed into the sleeve 21.

4 shows the representation according to 1 in a vertical section. The cutting plane lies along the section line IV-IV in 3 In this respect, 4 that to 1 Said.

2 shows the cooking appliance light 10 in the assembled state. The cover glass 14 is screwed into the sleeve 21. The holding part 20 here is firmly seated at the second end of the sleeve. The cooling body 16 with the lighting unit 11 - consisting primarily of the circuit board 12 with the LED light source 13 - is in turn fixed to the holding part 20, with the optics holder 18 with the internal collecting lens 19 being arranged between the circuit board 12 and the slat 22 close to the circuit board 12.

Based on 2 It can be seen first of all that the cooking appliance light 10 according to the invention forms a comparatively compact unit. By dispensing with the light guides known from the prior art between the LED light source 13 and an oven wall (not shown), a unit can be produced.

The cooking appliance light 10 shown is inserted into the cutout of a cooking chamber wall (not shown). The sleeve 21 extends through the cutout as far as possible until the support flange 23 is positioned on the inside of the cooking chamber wall. The locking wings 25 engage behind the cooking chamber wall and arrange the cooking appliance light 10 firmly and captively on the cooking chamber wall.

2 In particular, it can be seen that the light source unit 11 is clearly spaced from the cover glass 14 and thus from the cooking chamber (not shown) by the sleeve 21 - and here also by the holding part 20. The light source unit 11 and in particular the LED light source 13 is arranged outside the sleeve 21 and thus outside a space with heat build-up. A cooling air flow can be passed through the numerous air gaps between the second end of the sleeve 21 facing away from the cover glass 14 and the LED light source 13, which ensures sufficient heat dissipation, on the one hand from the LED operating heat and on the other hand from the heat radiating from the cooking chamber.

5 shows a longitudinal section through the cooking appliance light 10 as shown in 2 The cutting plane lies along the section line IV-IV in 3 . 5 allows a view into the interior of the assembled cooking appliance light 10. You can see the 1 and 4 components already described in detail. In this respect, reference is made to the previous drawing description.

Based on 5 one can now follow the path of the light emitted by the LED light source 13 in particular. The light leaves the LED light source 13 in the light exit direction X, i.e. in the direction of the cover glass 14. It first reaches the optics 19, which is designed as a converging lens and focuses the light emitted by the LED light source 13. In this way, the light is prevented from fanning out too widely and the light is guided in the manner of a directed and focused light beam in the direction of the cover glass 14. The light first passes through the circular openings of the slats 22 and then the interior of the sleeves 21.

As shown in the sectional views in 4 and 5 As can be seen, the cover glass 14 has an inner light entry surface 34 facing the LED light source, which is designed as an optically effective surface. The light leaves the cover glass 14 through the light exit surface 35 facing outwards, i.e. away from the LED light source 13, which in turn faces the cooking chamber of a cooking appliance.

The light entry surface of the cover glass 14 is concave, viewed in the light exit direction X. It has its apex in the center of the cover glass 14. This center corresponds to the passage of a longitudinal center axis (not shown in more detail) parallel to the sleeve wall through the cover glass. The light entry surface 34 extends outwards into the area of a mutual contact surface of the neck 31 of the cover glass 14 with the sleeve 21. With the exception of a material web required to form the external thread 32, the entire inside of the cover glass 14 is thus designed as a light entry surface 34 or, due to the concave design, as an optically effective surface.

The entrance surface 34 is designed to scatter the light from the LED light source 13, which is bundled by the collecting lens 19, for optimal illumination of the cooking chamber. The radius of curvature of the light entrance surface 34 is adapted to the conditions of the cooking chamber. Depending on the arrangement of the cooking chamber, the light A suitable curvature is selected for the appliance light in the cooking chamber in order to scatter the light as optimally as possible for illumination. The light entry surface 34 thus forms an optical lens surface.

The exit surface 35 is directed orthogonally to the longitudinal center axis of the sleeve 21 and can be structured for additional diffuser effects.

The invention shows how a compact cooking appliance light 10 can be designed without the use of complex light-guiding elements, without having to make compromises in heat dissipation to protect the LED light source 13. For this, the arrangement of the lamp unit 11, spaced from the cover glass by the sleeve 21 and located outside the sleeve 21, is essential. Also essential is the optically effective cover glass 14, which scatters the light emitted by the lamp unit to illuminate the cooking chamber. It is of great advantage if a converging lens is arranged downstream of the LED lamp 13 in the light exit direction X. This bundles the emitted light and thus significantly reduces light losses on the path between the LED light source 13 and the cover glass 14.

List of reference symbols

10

Cooking appliance light

11

Lamp unit

12

Circuit board

13

LED light source

14

Cover glass

15

Connection source

16

Heatsink

17

Fasteners

18

Optics holder

19

Optics/Converging lens

20

Holding part

21

Sleeve

22

Slats

23

Support flange

24

Sleeve wall

25

Latching wing

26

Tab

27

Latching opening

28

Tab holder

29

Locking projection

30

Fastening stamp

31

Neck

32

External thread

33

Thread sections

34

Light entry surface

35

Light exit surface

X

Light emission direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 202019106170 U1 [0002]

Claims (10)

Cooking appliance light (10) for arrangement in a cooking wall recess of a cooking appliance, in particular an oven, steam cooker or microwave cooking appliance, - with a sleeve (21) which is provided with a support flange (23) at its first end and is intended with the first end for arrangement on a cooking chamber wall, - with a longitudinal central axis which passes through the cooking appliance light (10) parallel to the sleeve wall, - with locking means (25) which are arranged downstream of the support flange (23) in the direction of the second sleeve end, wherein the cooking appliance wall is intended for arrangement between the support flange (23) and the locking means (25), - with holding means (20) at the second sleeve end, - with a lighting unit (11) which comprises at least one LED lighting means (13) on a cooling body (16) and is arranged by the holding means (20) at the second sleeve end, - with a cover glass (14) which closes the sleeve (21) at its first end, wherein - the cover glass (14) forms a light entry surface (34) on its inner side facing the lighting means (11) and a light exit surface on its outer side facing away from the lighting means (11) and facing a cooking chamber, characterized in that - the light entry surface (34) of the cover glass (14) is designed as an optically effective surface which influences the light emitted by the lighting means (11) in the direction of the cover glass (14) and passing through the cover glass (14) in its direction of emergence. Cooking appliance light (10) after Claim 1 , characterized in that the optically effective surface causes light scattering when it exits the cover glass (14). Cooking appliance light (10) after Claim 1 or 2 , characterized in that the optically effective surface is concavely curved in the light emission direction (X). Cooking appliance light (10) after Claim 3 , characterized in that the concave curvature has its apex in the center of the cover glass (14). Cooking appliance light (10) after Claim 4 , characterized in that the concave surface extends into the region of mutual contact between the sleeve (21) and the cover glass (14). Cooking appliance light (10) according to one of the Claims 1 until 5 , characterized in that the light exit surface (35) is directed orthogonally to the longitudinal central axis. Cooking appliance light (10) after Claim 6 , characterized in that the light exit surface (35) is flat. Cooking appliance light (10) after Claim 6 , characterized in that the light exit surface (35) is structured. Cooking appliance light (10) according to one of the preceding claims, characterized in that a collecting lens (19) is arranged in front of the cover glass (14) in the light exit direction (X), which focuses the light emitted by the LED light source (13). Cooking appliance light (10) after Claim 9 , characterized in that the LED light source (13) is arranged outside the sleeve (21) and in particular upstream of the sleeve (21) in the light exit direction (X).

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