DE102009002775A1 - Lamp for household appliance and household appliance, in particular for preparing food, with a lamp - Google Patents

Abstract

Lamp for a domestic appliance (1), which has at least one light source (23) and a front light-permeable cover (9) which is connected to a housing part (10), wherein the light source (23; 23a, 23b, 23c) at the Cover (9) facing away from (14) of the housing part (10) outside of the housing part (10) is arranged in the beam path (H) of the light source (23) at least one translucent cover member (16, 22) is arranged, wherein light (L) the light source (23, 23a, 23b, 23c) can be emitted from the lamp (6) through the cover element (16, 22) and the cover (9). The invention also relates to a domestic appliance, in particular an oven (1), with a lamp (6).

Description

The The invention relates to a lamp for a household appliance, which at least one light source and a front translucent cover having, with a housing part connected is. Furthermore, the invention relates to a household appliance with a Lamp.

at Home appliances, like ovens or the like, it is known that lamps are used to to illuminate the oven. Since it in the cooking chamber in the operation of the household appliance usually very warm, the lamp is exposed to these conditions. Just when they are arranged in the cooking chamber or at least partially extends into the cooking chamber, can thereby at specific lamp types a functional impairment or damage occur. This temperature effect is relatively unproblematic at conventional Oven lamps holding a light bulb exhibit. These need but in operation a lot of energy.

It It is an object of the present invention to provide a lamp for a household appliance, which is unproblematic in terms of heat and beyond can be operated more energy efficient.

These The object is achieved by a lamp having the features as claimed 1, and a household appliance, which has the features of claim 14 solved.

A lamp according to the invention for a household appliance includes at least one light source. In addition, the lamp includes a front translucent Cover. This cover is connected to a housing part of the lamp. The light source is on the side facing away from the cover of the housing part preferably outside of the housing part arranged. In the beam path of the light source is at least one translucent cover element arranged between the cover and the light source, wherein light the light source through the cover element and the cover of the Lamp is radiatable. By such a design of the lamp with the cover and the cover element can the quasi arranged behind it Light source against temperature influences better protected become. Furthermore, the lamp is for a more energy efficient operation designed.

Preferably is a cover element on the upper side facing the light source of the housing part arranged. The cover element thus serves as a cover of the housing part, so on the opposite Sides of the housing part arranged on the one hand the cover and on the other the cover element is. The design allows for one thing as possible good attachment of the cover element. On the other hand, through this quasi sequential arrangement and in view of the consideration in longitudinal axis the lamp in series with each other arranged positioning between the cover element and the cover can be reached that the light the light source is particularly easy and without complicated detours and Distractions can be radiated through these two components is.

Preferably has the housing part vents on, by what heat from a through the housing part and the cover formed cavity is dissipatable. Through the housing part, the Cover and a particular arranged on the housing part cover element Thus, a hollow chamber is formed so that when a temperature on the Side of the cover the heat first Quasi largely kept in this cavity can be and not over the cover element in large Quantities also penetrates to the light source. This quasi first heat storage room allows then through the vents in the housing part, that this heat can escape and there is no overheating in this cavity. The vents are especially designed so that the exiting heat is not led to the light source is. In particular, it is provided that the ventilation openings in one opposite the horizontal at an angle lowered outside wall of the housing part are formed. The heat can thus rise up out of the cavity and out automatically over the cavity the vents escape. The arrangement of components cover, cover element and housing part on the one hand and the ventilation openings in the housing part On the other hand give a particularly advantageous concept for thermal Decoupling the light source from acting on the side of the cover Temperaturbeaufschlagung the lamp.

Preferably the lamp has a light well on top of the cover opposite side of the housing part is arranged, through the light shaft, the light of the light source can be conducted to the cover element. Preferably, the light shaft is coaxial arranged to the axis of the lamp. Through the light shaft is quasi a spacer between the assembly comprising the housing part and the cover and in particular the cover element on the one hand and the light source created on the other. The light source can thus further spaced apart from temperature-stressed components the lamp can be positioned. At the same time, however, a special advantageous light line can be ensured towards the cover.

Preferably the light shaft is directly at the top of the housing part attached and connected to this. This can on the one hand a mechanical stable arrangement are created and beyond possible low light losses can be achieved.

Preferably is through the cover member of the cavity in the light shaft of the cavity between the housing part and the cover separated, in particular thermally decoupled.

Preferably the light shaft is rectilinear and is in particular on a housing part attached. Also by this configuration is almost in viewing direction along the longitudinal axis the lamp of the light shaft viewed directly from the light source in front of the housing part arranged so that there are no required Lichtumlenkelemente or the like required become. The components mentioned are thus in particular in the main emission direction the light source, which in particular corresponds to the longitudinal axis of the lamp or in the case of several light sources, at least one light source is parallel as the main emission direction to this longitudinal axis of the lamp is arranged along this.

Preferably is the at least one light source on the housing part opposite end of the light shaft, especially outside of the light shaft, arranged. This allows for a simple accessibility to the light source and beyond guaranteed also an additional one cooling way the light source with cooling air.

Preferably is on the side facing away from the housing part End of the light shaft, a support element arranged, which carries the at least one light source. The mechanically stable attachment can be ensured.

Preferably the at least one light source is arranged on a circuit carrier, which of the support element is held. In particular, it is provided that the at least one Light source arranged on a heat sink which is with the support element connected is. Through this heat sink is on the one hand a particularly efficient heat dissipation from the light source and in particular allows the circuit carrier, on the other hand, the mechanically stable connection of the carrier element with this heat sink for Mounting the components made particularly suitable.

Preferably the carrier element has openings on, by which cooling air for cooling the at least one light source can be flowed through. In particular the carrier element in cross-section U-shaped. It may also be designed so that it only at its vertices upright columns has, with which the heat sink is held. This allows the flow the cooling air again be improved.

Preferably is in the light shaft another translucent cover element and / or an optical element for deflecting the light beam and / or a optical element for bundling or widening of the light beam is arranged. In addition or instead can be provided that the inside of the light shaft at least partially formed with a light-reflecting layer is. Thereby can the light losses are reduced for a once again and through the use of a further cover element and / or an optical Elements can be the light bundling or widening to the best possible Light emission and uniform illumination of a room become. As optical elements can Mirror or lenses, etc. may be provided.

When it is particularly preferred if at least one light source a light emitting diode and thus a light emitting semiconductor device is. This can be designed to be particularly compact and small and allows about that In addition, a particularly energy-efficient operation. Especially with such Light sources is a problem due to the design of the lamp Use at relatively high temperature conditions, as for example in ovens or the like is allowed. As light-emitting diodes usually are very sensitive to temperature, can through the lamp and its Components can be achieved that the light source is also in operation of the household appliance is exposed to relatively low temperature loads and the lamp nevertheless, at least in some areas within the temperaturbeaufschlagten Space can be arranged.

Of Furthermore, the invention relates to a domestic appliance, in particular for preparing of food, which is a lamp according to the invention or an advantageous Embodiment thereof. The home appliance can, for example, as an oven be formed with a cooking space.

In particular, it is provided that this household appliance has a receiving space, in particular a cooking chamber, which can be acted upon by a heating device with heat, wherein the lamp is arranged to illuminate the receiving space and the cover of the lamp at least partially hineinerstreckt into the receiving space. The best possible illumination of the receiving space can be ensured on the one hand and on the other hand, a particularly energy-efficient operation, especially when light-emitting diodes be used as light sources are guaranteed, and it is precisely these light sources are then positioned outside of the receiving space and an excessively large heat exposure of the light source can be avoided.

Preferably the lamp is arranged in the ceiling of the receiving space. Especially this is gas-tight and moisture-proof in the ceiling. In particular, it is provided that the housing part sealing the ceiling the receiving space is arranged.

It can be provided that the housing part and the light shaft one piece are formed. It may be provided an embodiment of plastic be. The housing part and the light shaft can but also non-destructive solvable connected in this regard a screw or a connector or a snap-in connection can be provided. In a similar manner, the light shaft and the carrier element integrally formed be. Again, a realization of plastic provided be. Likewise, however, can also be realized here that the light shaft and the carrier part destructively detachably formed are, with regard to specific examples to those is referenced as between the housing part and the light shaft can be realized.

Preferably the cover is non-destructive solvable with the housing part connected, in which case in particular also a screw or a plug connection or a latching connection may be provided can.

The at least one cover element, which is preferably at the top within the housing part on the housing part is arranged, is also preferably non-destructive solvable on the housing part arranged. Here can also be a connector as advantageous Design provided be.

By the at least one arrangement of the cover element can be a thermal Separation between the cavity formed in the arrangement between the cover and the housing part be reached by the cavity in the light shaft.

To towards the light source, no further heat supply is thus achieved, so that the thermal radiation of the light source can be minimized.

The Cover element can be made of a glass material and can be clear, milky or designed as a scattering lens be. This cover element can in addition to a simple introduction glued in the form of a plugging or pinching in the housing part be. The light shaft can also be configured in several stages, wherein In this context, a plurality of cover elements are arranged. Through this a plurality of cover elements can then be a further improved thermal Decoupling of the light source can be achieved as additional cavities are formed, through which a heat buffering can be achieved can.

Preferably is provided that an optical element at the entrance of the light channel is arranged, wherein the optical element, for example, a converging lens can be. As a result, the light of the at least one light source bundled be and with it as possible low losses up to the cover and out of the cover be blasted. It can also be provided that instead of a Lens for all light sources each light source has an associated lens. This can, for example, in an embodiment of the lamp with several Be provided light emitting diodes. The bundled light can then pass through the last, from the light source farthest cover element or sprinkled through the cover again to get as close as possible uniform lighting reach the illuminated with the lamp room. Preferably This cover element and / or the cover is as milky cloudy disc or designed as a scattering lens.

On the circuit carrier, preferably arranged on the light source, in particular the LEDs If necessary, a temperature sensor can also be arranged, which is too high temperature switches off or downlights the LEDs, to avoid damage to protect. The circuit carrier, which may be of known materials or of ceramic is preferred with a thermally conductive Glue on the heat sink, which preferably made of aluminum, glued. The circuit carrier and the heat sink can also one piece made of ceramic be. The heat sink can thermally with an outer casing of the household appliance coupled to increase the cooling area.

Preferably are the one or more cover elements made of a non-conductive or poorly thermally conductive material educated. For example, glass may be provided.

Just when one or more LEDs are used as a light source or light sources, compared to a lamp with conventional Glühdrahtbeluchtmittel a much more energy efficient operation can be possible. Due to the smaller size of the LEDs then the opening in the ceiling of the receiving space can be made smaller than conventional filament bulbs. Thereby who reduces the heat losses through the smaller, non-isolated place. This leads to a lower energy consumption of the whole appliance when preparing food. In addition, the use of light-emitting diodes allows the color temperature of the light to be selected almost freely. This also allows illumination that appears to the observer more similar to the usual daylight than is the case with conventional bulbs.

Further Features of the invention will become apparent from the claims, the Figures and the description of the figures. The above in the description mentioned features and feature combinations as well as in the Character description mentioned feature and feature combinations and / or the features and combinations of features shown alone in the figures, are not only in the specified combination but also in suitable for other combinations or in isolation, without the To leave frame of the invention.

One embodiment The invention is explained in more detail below with reference to schematic drawings. It demonstrate:

1 a schematic perspective view of a household appliance according to the invention;

2 a schematic sectional view of the lamp in the household appliance according to 1 ;

3 a side view of an embodiment of a lamp according to the invention; and

4 a perspective sectional view of the lamp according to 3 ,

In The figures are the same or functionally identical elements with the provided the same reference numerals.

In 1 is shown in a perspective view of a domestic appliance for preparing food, which is used as an oven 1 is trained. The oven 1 includes a cooking chamber 2 trained receiving space, can be introduced into the food for cooking. The cooking space 2 is through a muffle 3 or limited their walls, wherein a front opening is formed, which through a door 4 is closable. In a blanket 5 the muffle 3 is at least a lamp 6 educated. Both the number and position of the lamp 6 are only examples.

With the lamp 6 becomes the cooking space 2 during operation of the oven 1 illuminated. Not shown means for generating heat, such as radiators, generate heat in the oven 2 through which the food can be cooked. This heat also affects the lamp 6 a, wherein due to the design of the lamp 6 a temperature exposure undesirably the light source of the lamp 6 can be avoided.

In 2 is a schematic representation of a sectional view of an embodiment of the lamp 6 according to their arrangement in the ceiling 5 shown. The lamp 6 extends partially into the oven 2 into it. Outside the cooking chamber 2 is on the ceiling 5 an insulation material 7 appropriate. In the insulation material 7 and the ceiling 5 is an opening 8th formed by which the lamp 6 extends and on both sides of the ceiling 5 is trained.

The lamp 6 includes a front translucent cover 9 , which is formed for example of glass. The cover 9 extends into the cooking chamber 2 , The lamp 6 also includes a housing part 10 , which is formed integrally for example of plastic. The cover 9 is in the housing part 10 screwed. The housing part 10 is with the ceiling 5 so connected, that the opening 8th is sealed gas-tight and moisture-proof. For this purpose, a separate sealing element can be provided.

The cover 9 is at a lower end 12 of the housing part 10 bolted to this, with this in the exemplary embodiment a screw connection 11 is provided. The cover 9 can thus non-destructive of the housing part 10 be solved.

Through the housing part 10 and the cover 9 is a cavity 13 educated.

The housing part 10 indicates at its upper end 14 and thus on the cover 9 opposite end 14 an opening through which a first translucent cover element 16 is covered. The cover element 16 is on the inside of the housing part 10 attached, for example, an entrapment or insertion or even gluing may be provided. The cover 9 and the cover element 16 are on opposite sides 12 and 14 of the housing part 10 arranged, however, in the direction of the longitudinal axis of the lamp, which in the embodiment equal to the main emission direction H at least one centrally positioned light source 23 is arranged in series with each other. By means of the cover element 16 becomes the opening 15 covered, so the cavity 13 over the opening 15 is closed. The cover element 16 is made of a translucent material, in particular made of glass, so that in addition to the light transmission and a thermal decoupling of the light source 23 can be achieved, with this preferential way the cover element 16 is coated accordingly or has a corresponding material component.

The housing part 10 is to the upper end 14 formed tapered, wherein at this taper and the oblique outer wall produced therewith ventilation openings 17 and 18 are formed. The number of vents 17 and 18 is merely an example, it can also be provided several such vents, which are not marked in detail.

About these vents 17 and 18 can be in the cavity 13 during operation of the oven 1 generated heat W are discharged according to the arrow. Immediately to the top 14 then there is a light shaft 19 formed, which for guiding the light L of the light source 23 on the one hand and for further distance generation between the light source 23 and the cooking space 2 contributes. The light shaft 19 has an inside 20 on, which is at least partially formed of a highly light-reflecting material. In addition, the light shaft 19 coaxial with the longitudinal axis of the lamp 6 educated. The light shaft 19 is designed in a straight line so that the light L of the light source 23 can be radiated in the main emission and must not be deflected. At one of the housing part 10 opposite upper end 21 of the light shaft 19 is in the embodiment another translucent cover element 22 arranged. This can also be designed as an optical element in the form of a converging lens. In addition, it can be provided that in the light shaft 19 at least one further cover element and / or an optical element is arranged, sodas also in the light shaft 19 several separated cavities are formed cascade-like. In the embodiment shown, only the entire cavity is 28 shown. Through this successive configuration of cavities 13 and 28 can the thermal decoupling of the at least one light source 23 to be improved.

The light source 23 is designed as a light emitting diode, which on a circuit carrier 24 is arranged. The light source 23 is outside the lightwell 19 formed and adjacent to the upper end 21 of the light shaft 19 positioned.

The light source 23 and the circuit carrier 24 are in the embodiment of a heat sink 25 attached. This heat sink 25 additionally allows the heat of the light source 23 dissipate and is preferably with a housing, not shown, of the oven 1 thermally coupled, so that an enlarged configuration of the heat sink can be generated for heat dissipation.

In addition, the lamp includes 6 a carrier element 26 which is in 2 can not be seen. The carrier element 26 is with the light shaft 19 and the heat sink 25 connected and carries the heat sink 25 and thus also the circuit carrier 24 and the at least one light source 23 ,

The carrier element 26 is integrally formed and includes openings through which cooling air K can flow laterally, and can flow out again on the other side, so that the light source 23 can be cooled by the cooling air flow K.

The components of the lamp 6 are in the embodiment shown in the main emission direction H of the centrally positioned light source 23 and thus also the longitudinal axis of the lamp 6 positioned in series with each other, in this respect first the light source 23 , then the lightwell 19 , then the first cover element 16 , the housing part 10 and the cover 9 consequences.

In the oven 2 Temperatures of 275 ° C, for example, thereby also the lamp 6 is thermally acted upon. In the cavity 13 Therefore, heat forms, with this heat W through the vents 17 . 18 so dissipated that the lamp 23 is not affected.

The light L of the light source 23 In the exemplary embodiment is quasi essential in Hauptabstrahlrichtung H through the light shaft 19 and the cover element 16 and the cover 9 in the oven 2 blasted. Outside the cooking chamber 2 in the area of the light source 23 In particular, maximum temperatures up to about 70 ° C occur.

Preferably, a plurality of light sources 23 used in the form of several light emitting diodes.

In 3 is a side view of the lamp 6 shown. In this embodiment, the components can be seen from the outside, in particular the connection between the light shaft 19 and the heat sink 25 by means of the carrier element 26 you can see. The support element 26 has relatively large openings 27a on, by which cooling air K in the flow direction perpendicular to the figure sheet by the support element 26 can flow and thus the majority of light sources 23a . 23b and 23c can cool. In addition, it can also be provided that additional openings 27b in the carrier element 26 are formed, whereby a cooling air flow in the plane of the figure quasi from the other side, the light sources 23a to 23c can cool.

In 4 is a perspective sectional view of the lamp 6 as shown in 3 shown, with the cutting plane in 3 in the figure renebene lies and the representation in 4 a twisted about the lamp axis representation shows. Again, the structure of the carrier element 26 to recognize which has at the corners upstanding columns through which the connection to the heat sink 25 given is. In addition, the heat sink sits with its underside on carrier webs of the support element 26 on. The circuit carrier 24 is at this bottom of the heat sink 25 attached, in this regard, an attachment is provided with a thermally conductive adhesive.

1

oven

2

oven

3

muffle

4

door

5

blanket the muffle

6

lamp

7

insulation material

8th

opening

9

cover

10

housing part

11

screw

12

lower The End

13

cavity

14

upper The End

15

opening

16

cover element

17 18

vents

19

light well

20

inside of the light shaft

21

upper The End

22

cover element

23 23a, b, c

Light source (s)

24

circuit support

25

heatsink

26

support element

27a, b

openings

H

beam path

L

light

W

warmth

Claims (15)

Lamp for a household appliance ( 1 ), which at least one light source ( 23 ) and a front translucent cover ( 9 ), which with a housing part ( 10 ), characterized in that the light source ( 23 ; 23a . 23b . 23c ) on the cover ( 9 ) facing away ( 14 ) of the housing part ( 10 ) preferably outside of the housing part ( 10 ) is arranged, and that in the beam path (H) of the light source ( 23 ) at least one translucent cover element ( 16 . 22 ), wherein light (L) of the light source ( 23 ; 23a . 23b . 23c ) through the cover element ( 16 . 22 ) and the cover ( 9 ) from the lamp ( 6 ) is radiatable. Lamp according to claim 1, characterized in that a cover element ( 16 ) at the light source ( 23 ; 23a . 23b . 23c ) facing end ( 14 ) of the housing part ( 10 ) is arranged. Lamp according to claim 1 or 2, characterized in that the housing part ( 10 ) Ventilation openings ( 17 . 18 ), by which heat (W) from a through the housing part ( 10 ) and the cover ( 9 ) formed cavity ( 13 ) is dissipatable. Lamp according to one of the preceding claims, characterized in that a light shaft ( 19 ) on the cover ( 9 ) facing away ( 14 ) of the housing part ( 10 ) is arranged, through which the light (L) of the light source ( 23 ; 23a . 23b . 23c ) to the cover element ( 16 . 22 ) is conductive. Lamp according to claim 3 and 4, characterized in that by the cover element ( 16 . 22 ) the cavity ( 28 ) in the light shaft ( 19 ) from the cavity ( 13 ) between the housing part ( 10 ) and the cover ( 9 ) is separated, in particular thermally decoupled. Lamp according to claim 4 or 5, characterized in that the light shaft ( 19 ) is rectilinear and on the housing part ( 10 ) is attached. Lamp according to one of claims 4 to 6, characterized in that the at least one light source ( 23 ; 23a . 23b . 23c ) on the housing part ( 10 ) facing away from the end ( 21 ) of the light shaft ( 19 ), in particular outside the light shaft ( 19 ) is arranged. Lamp according to one of claims 4 to 7, characterized in that on the housing part ( 10 ) facing away from the end ( 21 ) of the light shaft ( 19 ) a carrier element ( 26 ) is arranged, which the at least one light source ( 23 ; 23a . 23b . 23c ) wearing. Lamp according to claim 8, characterized in that the at least one light source ( 23 ; 23a . 23b . 23c ) on a circuit carrier ( 24 ) is arranged, which of the support element ( 26 ) is held. Lamp according to claim 8 or 9, characterized in that the at least one light source ( 23 ; 23a . 23b . 23c ) on a heat sink ( 25 ) is arranged, which with the carrier element ( 26 ) connected is. Lamp according to one of claims 8 to 10, characterized in that the carrier element ( 26 ) Openings ( 27a . 27b ), through which Cooling air (K) for cooling the at least one light source ( 23 ; 23a . 23b . 23c ) can be flowed through. Lamp according to one of claims 4 to 11, characterized in that in the light shaft ( 19 ) another translucent cover element ( 22 ) and / or an optical element for deflecting the light beam and / or for focusing or widening of the light beam is arranged and / or on the inside ( 20 ) of the light shaft ( 19 ) is formed a light-reflecting layer. Lamp according to one of the preceding claims, characterized in that a light source ( 23 ; 23a . 23b . 23c ) is a light-emitting semiconductor device. Domestic appliance, in particular for preparing food, with a lamp ( 6 ) according to any one of the preceding claims. Domestic appliance according to claim 14, which has a receiving space ( 2 ), which is acted upon by a heating device with heat, wherein the lamp ( 6 ) for illuminating the receiving space ( 2 ) and the cover ( 9 ) at least partially into the receiving space ( 2 ).