Luminous key for control system, and control system and household electrical appliance

FIELD: physics; control.

SUBSTANCE: key (20) for a control system (12) has a profiled body (26) made of light-conducting material, wherein the profiled body (26) has an activation direction (28) in which the profiled body (26) moves when the key (20) is activated; a functional side (30) having a light input area (32) and an activation area (34), wherein the activation area (34) is designed to activate a switching element (24) when the key is activated (20); a control side (36) having a light output area (38), wherein the profiled body (26) is designed to direct at least part of light entering the light input area (32) to the light output area (38); a spring-loaded protrusion (40) which is formed across the activation direction (28) integrated with the profiled body (26) such that upon interacting with part (16) of the housing, it is elastically deformed to provide a return force upon activation of the key (20) in order to move the key (20) back to the original position; a force-limiting element (42), which is formed across the activation direction (28) integrated with the profiled body (26) and designed to receive, upon interaction of the activation area (34) with the switching element (24), an excessive activation force through the spring-loaded displacement of the force-limiting element (42), and a first protrusion (52) which is integrated with the profiled body (26) and is designed to interact with part (16) of the housing to form an end stop for activating the key (20). A control system (12) and a household electrical appliance (10) are also disclosed.

EFFECT: easy manufacture of the key without reducing its functional capabilities.

15 cl, 6 dwg

This invention relates to a key management system, in particular for systems management appliance.

In addition, the invention relates to a control system that contains the screen, Cabinet portion, the circuit Board and the key.

Finally, the invention relates to a household appliance with a key.

To enable control for home appliance he has, as a rule, the controls, in particular, the keys that as part of the screening system, also called the system screen, located on the household appliance.

While before the switch was understood only in the sense of technical need, at the present time, it is recognized that the ability to manage household appliance and, in particular, control keys, has a significant impact on the adoption of the decision on the purchase. For example, users expect when the control key as pleasant tactile and optical response.

However, in addition to the clients ' wishes keys must also meet the essential technical functions, primarily safe and reliable power transmission control for an electric switching element, which is aligned with the key. In addition, the user must be protected from electric shock, and the thus estwenno, a consistent an electric switching element must be protected against mechanical overload the user. Since modern switches, such switches typically do not have sufficient return force, the required additional constructive measures to return the key after activation back to the starting position.

In the prior art there are many switches and keys, which provide both a switching function in cooperation with the switching element, and lighting, to identify the hand control switch, respectively, and keys. In this connection, it should be specified only as an example both of the following publications.

From US 5090791 known fiber-optic switch with its own lighting. The switch consists of a shell, in which the touch switch. The touch switch is mounted for movement against the action of springs. As in the shell, and the touch switch located waveguides, which can guide light from the light source to the side of the control. Depending on the position and orientation of the touch switch relative to the shell can be connected to each other in various waveguides.

In the US 5901836 shows the switch with lighted CNAS is coy. It is proposed to provide a mechanical switch light guide in the form of a cylinder, which has a beveled surface. This ensures the possibility of the placement side, i.e. outside of the mechanics of the switch, the light source and the light input from the light source through the inclined surface in the light guide. The light goes out then on the other end of the cylinder on the side of the control.

Although the switches and keys, according to the prior art can implement various functional characteristics, the production of these keys has meanwhile become quite complex.

However, this contradicts the usual requirements of cost reduction, which are also on the market of household appliances. Therefore, attempts were made to waive certain functions, in particular, from the lighting keys, but it was cultivated only in the segment of low prices. Also attempts to offer the desired functions in a simplified execution that make the clients sense a lack of value of the product.

Therefore, the objective of this invention is to provide an improved key control, in particular, for system management appliance. Improvement shall, in particular, consist in low cost manufacturing of keys without the need of reduction functions. In addition, there should be created accordingly improved the control system and, accordingly, improved household appliance.

According to the first aspect of the invention, this problem is solved with the help of keys for system control, this key has a shaped body of a pure material, while the shaped body contains:

- direction of actuation, which moves the shaped body when the actuation keys

- functional side, which has an area of the input light and the zone of actuation, the zone of actuation is designed to actuate the switching element when the actuation keys

- side management, which has an area of light output, while the shaped body is designed for directing at least part of which is included in the entrance area light the area light output,

spring ledge, which is made across a direction of actuation in the form of a single whole with a shaped body so that he has when interacting with a part of the body spring elastically deformed, to ensure when casting the key to actuate the return force to move the key back to its original position,

- limiting the power of the element, which is made across a direction of actuation in the form of a single whole with the shaped body and is intended for perception in the interaction zone of the actuation switch is determined as being the element of excessive force to actuate through a spring movement restricting force element, and

the first protrusion, which is made as a whole with the shaped body and is designed to interact with a part of the body, to form thereby end stop to actuate the keys.

The key, according to the invention, provides, inter alia, the advantage that the proposed shaped body performs several functions. Thus, the shaped body provides as a function of light through the zone of entrance of light and area light output and reflexive function by means of spring ledge. In addition, by constraining force element allows effective overload protection: when pressing the constraining force of the element to the switching element, it is elastically deformed. With the loss of limiting the power of the element of contact with the switching element limiting the power of the element returns to its original position.

On the springy action of the spring tab and the characteristic of limiting the power of the element can be influenced by a suitable choice of the geometry of the spring protrusion, respectively, limiting the power element and the material of the shaped body. If keys need to be applied, for example, a hard material, at the expense of sufficient length spring ledge you can achieve the desired deformation and return atoi force. If the shaped body is made of softer material, due to shorter and/or thicker spring tab can provide a sufficient return force. The same applies to the limiting force of the element.

The first protrusion is made of a relatively hard, so that the first protrusion when the application of force by being deformed or displaced. Because the first protrusion made of the same material as the spring ledge, with a spring-loaded protrusion should spring elastically deformed, the first protrusion is preferably short and/or thick relative to the direction of actuation in comparison with spring ledge, which is made elongated and thin. Because the first protrusion prevents the actuation of a key at a certain point, the first protrusion also serves as protection for spring ledge, so that it is not bent too much.

The proposed design is preferred, in particular for keys with short-stroke keys, as is known, consists of several key parts in the design based on the sum of the tolerances of the individual parts can have significant errors with respect to the stroke of a key. Therefore, the proposed key effectively reduces the risk of extended inclusion or not point is reached the pressure.

In contrast to conventional switches and keys of the prior art, the invention integrates several functions designed in the form of a whole shaped body. In addition, as will be explained in more detail below, the proposed shaped body provides more opportunities for additional extension functions.

Another advantage that may be realized by means of a shaped body, is to protect electronics from liquids (safety aspect). If the liquid penetrates from the control screen in the area keys, then prevents the ingress of fluid in the direction of the PCB: liquid retained shaped body and drips under the action of gravity down. For this purpose, the shaped body, in particular in the area of the spring ledge, made with a plate extension, and the plane extending at least approximately passes perpendicular to the direction of actuation of the key.

By performing the shaped body as a whole, the shaped body is preferably manufactured using the method of injection molding. Due to this, particularly preferably allows the manufacture of keys, in particular, short-stroke keys, return properties and the properties of light as a single injection molded part.

Under the concept of "the yerek direction actuation" should be understood here and in the following, that element, in this case, the spring tab that goes in the direction which is the direction of actuation angle of at least 15°, preferably at least 30°, particularly preferably at least 45°, in particular at least 60°.

Thus, the problem is solved completely.

In one preferred embodiment, a limiting effect element made in the form of the first edge with a first longitudinal side and a first lateral side, the first longitudinal side is preferably longer than the first transverse side, more preferably more than twice the length of the first transverse side.

This form is economical to implement and provides a simple possibility to adjust the characteristics of the limiting effect of the element relative to the material of the shaped body. When there is a flexion limiting the power of the element along the longitudinal side, then increase the stiffness of the constraining force of the element by shortening the effective longitudinal sides extend transverse direction and/or increase side up.

In another preferred embodiment, a spring-loaded protrusion is made in the form of the second edge with the second longitudinal side and the second lateral side, while the second longitudinal side preference is sustained fashion longer than the second lateral side, more preferably more than twice as long and, in particular, more than three times longer than the second transverse side.

It is also economical to implement and provides a simple possibility to adjust the spring characteristics of the projection relative to the material of the shaped body. When there is flexing of the spring protrusion along the longitudinal side, increase elasticity limiting the power of the element by lengthening the effective longitudinal sides, narrowing of the lateral sides and/or perform more delicate side. Particularly preferably in this regard, when the shaped body has at least two, in particular at least three spring tabs, which are all at least approximately in one plane. Due to this, it is possible to achieve a particularly uniform spring action.

In another preferred embodiment, the shaped body is crosswise to the direction of actuation of the second protrusion, which is made as a whole with the shaped body and is designed to interact with the screen, to form a stop for the starting position of the key.

This option execution enables particularly simple tasks the beginning of the path of travel. For the second ledge fair calculations regarding who carried out the first ledge. However, because the user when the actuation keys cannot apply a force directly to the second protrusion, the second protrusion should not perform the same stability requirements, the first ledge.

In another preferred embodiment, the shaped body is parallel to the direction of actuation guide element, which is made in the form of a single whole with the shaped body and is intended for the direction keys during actuation along the direction of actuation.

This option execution enables particularly good directions key during its motion. Thus, in particular, preferably, when the guide element interacts with the opposite guide member on the side of the hull. In this guide element is preferably in the form of an elongated protrusion, relative to the direction of actuation, and opposite the guide element is designed as a notch.

In another preferred embodiment, a fitting is at least approximately parallel to the functional side, and, in particular, the zone of actuation is parallel to the entrance area light, preferably in a common plane.

This option is done is of key enables a particularly preferred design of the control system, in which is installed the key. When party control extends at least approximately parallel to the functional side, the control system can be implemented in a structurally simple design of the " sandwich " type of screen, body parts and a circuit Board located between them is the key.

In another preferred embodiment of the invention, which in itself, i.e. also without spring ledge, limiting the power element and the first protrusion is of independent inventive improvement of the prior art, the shaped body is a first reflective surface that deflects light coming from the zone of entrance of the light, so that it can be directed to the area of light output, with the first reflective surface is formed by using the edge surface of the recess inside the shaped body.

Although usually known application of the outer edge surfaces of the shaped body for light reflection or refraction of light, in this case, the edge surface features within the shaped body, which is preferably the outer shape of the shaped body can be choose as independently as possible lying inside the boundary surface.

By using the reflective surface of the light coming from the zone of entrance of the light is deflected and SiteMapProvider on to the area of the light output. Due to this, the availability of positioning, within the specific framework conditions of the entrance area light area light output and zone activation. The first reflective surface is, in particular, that reflected on the reflective surface of the light source seems to be located approximately in the middle of the hand control. This achieves the homogeneity of the illumination.

In another preferred embodiment, a light in the shaped body is in the area of the light entering the first major direct light, and in the area of the light output is the second main direct light, while the first and second main direct light at least approximately parallel to each other.

This implementation provides a structurally simple design. In other words, the light enters in the first place with the first direction, the first main direct light, into the shaped body and leaves shaped body at the second point in the second direction, the second main direct light. When this light enters, in particular, in the lower side of the shaped body and extends on the upper side of the shaped body, however, the second main direct light does not coincide with the first major direct light.

In another preferred embodiment, the area of the actuation lies opposite zones of the output light when viewed along the direction of actuation.

This implementation is preferred because the power that makes the user to the key and thereby shaped body, can act directly on the switching element along the shortest possible path between the zone of actuation and the area of the light output. Due to this, may decrease, respectively, prevented the misalignment or tilting of the fitting body.

Determine areas actuate the opposite area of the light output you need, in particular, to check are whether each other area of the actuation and the exit area of the light when viewed along the direction of actuation. If it is at least partially so, the area of the actuation lies opposite the area of the light output.

In addition, in this regard, preferably, when the area of the input light is not contrary to the area of the light output. This implementation has the advantage that the input light into the shaped body, you can choose regardless of the position of the zone of actuation and zone output light. This opens up the possibility to form the shaped body.

In another preferred embodiment, the first reflective surface is formed by an edge surface of the recess inside the shaped body.

This option is done is ment provides the ability to easily perform the first reflective surface into the shaped body. Although relatively cheap to manufacture, it is preferable to create an edge surface with a notch, it should be noted that this edge surface inside the shaped body can also be carried out in other ways. In particular, by processing using a pulsed laser can be created inside the shaped body microcracks, which can serve as a diffuse reflective surface.

In another preferred embodiment, the shaped body has a main body and continue with the cross-section and longitudinal section, the zone of actuation and the area of the light output are located on the main body, and the entrance area of light on the continuation, and the cross-section protrudes from the main body across a direction of actuation and moves in the longitudinal section, which is located at a distance from the main body and passes, in particular at least approximately parallel to the direction of actuation.

In this embodiment, is particularly well recorded that on an electric circuit Board, which is used in connection with such key, the light source and the switching element can be realized only at a distance from each other. In this embodiment, it is possible to displace the light source relative to the plumage is lucatello element and yet simple way to introduce light into the main body.

In another preferred embodiment, the sequel has a second reflective surface which reflects the light that enters the entrance area light, in the direction of the main body, and a second reflective surface formed by the outer edge surface of the continuation.

This option execution enables the location of the entrance area of the light away from the zone of actuation, namely, depending on the location of the light source and the switching element on a corresponding printed circuit Board.

In another preferred embodiment, the first and second reflective surfaces are positioned so that light entering the entrance area of the light is initially directed at least approximately parallel to the direction of actuation to the second reflective surface, there is reflected in the direction crosswise to the direction of actuation and is directed towards the first reflective surface, there is reflected in a direction at least approximately parallel to the direction of actuation, and then in the area of the light output.

An embodiment provides a particularly simple design of the fitting body. The concept of "across" should be understood in this case and in future so that the angle with the direction of bringing in on the op perate is at least 15°, preferably at least 30°, particularly preferably at least 45ªand in particular at least 60°.

In another preferred embodiment, the first and second reflective surfaces are approximately at an angleαbetween 20° and 70°, preferably between 30° and 60°, particularly preferably between 40° and 50°, in particular at least 45° relative to the direction of actuation.

This run provides especially favorable direction of the beam inside the shaped body.

According to another aspect of the invention, the problem is solved by means of the control system containing the screen, part of the housing, the circuit Board and above the key in this printed circuit Board has a light source and a switching element, and when this key is to move on the screen and part of the body so that the key, when the actuation presses the switching element and drives the switching element.

When the light source is located so that it radiates in the entrance area of light, and the switching element is located opposite the zone trigger.

According to another aspect of the invention, the problem is solved using the appliance containing the above key.

It is clear that the name is e above and illustrated in the following signs can be used not only in the relevant specified combination, but also in other combinations or alone, without departing from the scope of this invention.

Below is a more detailed explanation of the invention on the basis of examples with reference to the accompanying drawings, which depict:

figure 1 - household appliance with multiple keys;

figure 2 is a first exemplary embodiment of a control system with multiple keys;

figure 3 is a first example of execution keys, in isometric projection;

figure 4 - key, according to figure 3, with the appropriate cover and circuit Board, side view;

5 is a second exemplary embodiment of the control system; and

6 is a second exemplary embodiment of a key.

Figure 2 shows the control system of the household appliance 10. It has a screen 14, the portion 16 of the casing and the circuit Board 18. Between the screen 14 and part 16 of the housing, there is at least one key 20, in this case six keys 20. Dashed lines are shown as separate keys are in ready home appliance 10.

On the circuit Board 18 there are several light sources 22 and multiple switching elements 24. In the embodiment shown here performing each key 20 is aligned with one of the light source 22 and one switching element 24. The keys 20 are held so that they can move on the screen 14 and side 16 of the housing t is to, each of the keys 20 when the actuation clicks on the corresponding switching element 24 and actuates the corresponding switching element 24.

Figure 3 shows the first exemplary embodiment 20 keys for system control 12. Key 20 has a shaped body 26 of the light guide material, with a shaped body 26 has a direction 28 of the actuation, in which it is moved upon actuation of a key 20.

The shaped body 26 has a functional side 30, which has an area of 32 input light and an area 34 of the actuation. Area 32 of the input light is designed for input of light into the shaped body 26 through the edge surface of the shaped body 26. Area 34 of the actuation is designed to actuate the switching element 24 upon actuation of a key 20.

In addition, the shaped body 26 has a side 36 of the control, which has an area of 38 light output, and the area 38 of the light output is made so that the shaped body 26 light can go to the other edge surface of the shaped body 26. The shaped body 26 is intended for sending at least part of light that enters the zone 32 of the entrance of light into the area 38 of the light output.

In addition, the shaped body 26 is made in the form of a single whole with a shaped body 26 of the following elements:

spring is ustop 40, in this case, four spring tabs 40, 40', 40”, 40'”, located across the direction 28 of the actuation and made so that it is in the interaction with part 16 of the housing spring elastically deformed, to ensure when the actuation keys to position the actuation of the return force to move the keys 20 back to its original position;

- limiting the power of the element 42, which is made across the direction 28 of the actuation and is intended for perception in the interaction zone 34 of the actuation switching element 24 excessive force actuation by springy movement restricting force element 42;

the first protrusion 52, which is designed to interact with a part 16 of the housing, to form a limit stop for the actuating key 20.

Limiting the power element 42 is made in the form of the first edge with the first longitudinal side 44 and the first lateral side 46, the first longitudinal side 44 in this case is approximately twice the length of the first lateral side 46. Spring-loaded protrusion 40 is made in the form of the second edge with the second longitudinal side 48 and the second lateral side 50, with the second longitudinal side 48 in this case is approximately three times longer than the second lateral side 50.

the moreover, on the molded body 26 is formed across a direction of actuation of the second protrusion 54 in the form of a single whole with a shaped body 26. The second protrusion 54 is designed to interact with the screen 14, to form thereby a source of focus for the initial position of the keys 20. Shown here embodiment, the second protrusion 54 has the shape of the surface over which is the area 38 of the light output. When examining the magnitude of the second protrusion 54 perpendicular to the direction 28 of the actuation in comparison with the magnitude of the zone 38 of the output light perpendicular to the direction 28 of the actuation, it can be seen that the magnitude of the second protrusion 54 more in particular, much more, preferably at least 1.5 times greater, and particularly preferably twice.

In addition, the shaped body 26 parallel to the direction 28 of the trigger is formed as a whole with a shaped body 26 of the guide element 56. The guide element 56 is intended for the direction key 20 during actuation along the direction 28 of the actuation. More specifically, the direction is achieved in interaction with the opposite guiding element 64 (see Fig.6).

Shows key 20 has, inter alia, the advantage that the shaped body 26 with all it functional areas to perform the network as a whole. In particular, in the shown key 20 into the shaped body 26 of the consolidated return function, overload protection and advanced lighting function. This leads, in particular, when used as a short-stroke keys to a significant relief and reduce the value.

When viewed shaped body 26 can be seen that the side 36 of the control at least approximately parallel to the functional side of 30. Additionally, the area 34 of the actuation is parallel to the zone 32 of the input light, in this case, in particular, in a common plane. In addition, the second protrusion 54 and the spring tabs 40, 40', 40”, 40'” located in another common plane.

Figure 4 shows a shaped body 26 on the side view, at the same time to illustrate the functions of the functional part 30 and the sides 36 of the control shows the printed circuit Board 18 with the light source 22 and the switching element 24, in this case, a microswitch, and a closing plate 58. You can see that the shaped body 26 upon actuation of a key 20 in the direction 28 of the actuation by zone 34 to actuate on limiting the power of the element 42 actuates the switching element 24. When the key 20 is pressed too much, limiting the power element 42 springs. The closing plate 58 allows Zelena allenna to set zone 38 of the light output.

In this side view you can see that the shaped body is approximately C-shaped, with the upper part of the "C" formed by the zone 36 of the control, and the lower part "C" is formed functional side of 30. The lower free end of the "C" contains a zone 34 of the trigger.

Figure 5 shows in a simplified exploded isometric projection, as the shaped body 26, according to figure 3, the keys 20 are integrated in the system control 12. In addition, this image can be further seen that the spring tabs 40, 40', 40”, 40'” interact with the opposite legs 60, 60', 60” part 16 of the housing.

The first protrusion 52 interacts with the stop 62 on the portion 16 of the housing. The guide element 56 is directed in the opposite guide element 64, which is formed on part 16 of the housing. Part 16 of the housing has the shape of the bath, respectively, "U", while the bath has a wide edge areas, which are located opposite the supports 60, 60', 60". In the bath depth, respectively, in the lower area of the "U" are the stops 62 and opposite the guide element 64.

Figure 6 shows the second embodiment of the keys 20 in the system control 12, which in itself is independent further development relative to the prior art. In this embodiment, are the same as those positions to indicate Odinak the o functional elements, even when they are made differently.

This feature of this variant execution is that in the shaped body 26 is first reflective surface 66, which deflects light coming from the zone 32 of the input light, so that it is directed to the zone 38 of the output light, the first reflective surface 66 is formed, in particular, the edge surface of the recess 68 within the shaped body 26.

The light in the shaped body 26 is in the zone 32 of the light entering the first main straight, 70 light and in the zone 38 of the output light of the second main straight, 72 light, while the first and second main straight 70, 72 light at least approximately parallel to each other. When viewed along the direction 28 of the actuation zone 34 to actuate lies opposite the zone 38 of the light output. It is preferred to mechanically actuate the switching element 24.

Another feature of this exemplary embodiment consists in that the shaped body 26 has a main body 74 and the continuation of the 76 cross-section 78 and longitudinal section 80. Area 34 of the actuation and the area 38 of the output light are located on the main body 74, and the area 32 of the input light on the continuation of 76. Transverse section 78 passes across, in this case approximately at right angles to the direction 28 of the actuation of the main ones is and 74 and moves in a longitudinal section 80. Longitudinal section 80 is located at a distance from the main body 74 and extends at least approximately parallel to the direction 28 of the trigger.

Continued 76 has a second reflective surface 82, which reflects the light coming from the zone 32 of the input light, in the direction of the main body 74, while the second reflective surface 82 formed outer edge surface 76 continue.

In General, the first and second reflective surfaces 66, 82 are positioned so that light that enters the zone 32 of the input light is initially directed at least approximately parallel to the direction 28 to actuate the second reflective surface 82, there is reflected in the direction crosswise to the direction 28 of the actuation, in particular, perpendicular to the direction 28 of the trigger and sent it to the first reflective surface 66. There the light is reflected in a direction at least approximately parallel to the direction 28 of the trigger, and then in the zone 38 of the light output.

The first and second reflective surfaces 66, 82 are located at least approximately at an angle α=45° to the direction 28 of the trigger.

Limiting the power element 42 in this embodiment is implemented using elastic layer 84, which is formed as a single C is the logo with a shaped body 26 by running into the shaped body 26 of the other of the notches 86. When pressing the constraining force of the element 42 to the switching element 24 layer 84 is deformed into the recess 86. Particularly preferably, the shape can be selected so that the edge 88 of the recess 86 may be positioned on the printed Board 18, to ensure the possibility of perception is also a great strength.

Thus, in General we propose a new key, a new control system and a new household appliance, which is simple and economical to manufacture.

1. Key (20) for the system (12) control key has a shaped body (26) of the light guide material, with a shaped body (26) contains:
- direction (28) of the trigger that moves the shaped body (26) when the actuation button (20),
functional side of (30), which has an area (32) of the input light and the zone (34) of the actuation, the zone (34) actuation is designed to actuate the switching element (24) when the actuation button (20),
side of (36) control, which has an area (38) of the output light, while the shaped body (26) is intended for sending at least part of light that enters the zone (32) of the input light to the area (38) of the light output,
- spring device (40)which is formed across a direction (28) of the actuation in the form of a single whole with a shaped body (26) so that it when cooperation is the interaction with part (16) of the housing spring elastically deformed to provide at bringing key (20) to actuate the return force to move the keys (20) back into its original position,
- limiting the power of the element (42)which is formed across a direction (28) of the actuation in the form of a single whole with a shaped body (26) and is intended for perception in the interaction zone (34) of the actuation switching element (24) excessive force to actuate through a spring movement restricting force element (42), and
the first protrusion (52), which is made as a whole with a shaped body (26) and is designed to interact with a part (16) of the housing to education thereby end stop for the actuation of a key (20).

2. Key according to claim 1, in which the constraining force element (42) is made in the form of the first edge with the first longitudinal side (44) and the first transverse side of (46), the first longitudinal side (44) is preferably longer than the first transverse side of (46), more preferably more than two times longer than the first transverse side of (46).

3. Key according to claim 1, in which the spring device (40) is made in the form of the second edge with the second longitudinal side (48) and the second transverse side (50), while the second longitudinal side (48) is preferably longer than the second transverse side (50), more preferably more than twice as long and, in particular, more than three times longer than the second transverse side (50).

4. Key according to claim 1, in which the shaped t is lo (26) has a crosswise direction (28) actuate the second protrusion (54), which is made as a whole with a shaped body (26) and is designed to interact with the screen (14)to form a stop for the starting position key (20).

5. Key according to claim 1, in which the shaped body (26) is parallel to the direction (28) to actuate the guide element (56), which is made as a whole with a shaped body (26) and is intended for the direction keys (20) during actuation along the direction (28) of the trigger.

6. Key according to claim 1, in which side (36) is at least approximately parallel to the functional side of (30), and, in particular, the area (34) actuation is parallel to the entrance area (32) of the light, preferably in a common plane.

7. Key according to claim 1, in which the shaped body (26) is first reflective surface (66), which deflects the light coming from the zone (32) of the input light, so that it can be directed to the area (38) of the output light, the first reflective surface (66) is formed, in particular, by using the edge surface of the recess (68) inside the shaped body (26).

8. Key according to claim 1, in which the light into the shaped body (26) has a zone (32) of the light entering the first main straight (70) light, and in the area (38) of the output light is the second main straight (72) light, while the first and second main straight (70, 72) of the light Myung is our least approximately parallel to each other.

9. Key according to claim 1, in which area (34) actuation lies opposite the area (38) of the output light when viewed along the direction (28) of the trigger.

10. Key according to claim 1, in which the shaped body (26) has a main body (74) and continuation (76) cross-section (78) and longitudinal section (80), the zone (34) actuation and area (38) of the output light are located on the main body (74), and area (32) of the input light on the continuation of (76), while the cross-section (78) is of the main body (74) across a direction (28) of the actuation and moves in a longitudinal section (80), which is located at a distance from the main body (74), and passes, in particular at least approximately parallel to the direction (28) of the trigger.

11. Key of claim 10, in which the continuation (76) has a second reflective surface (82), which reflects the light that enters the zone (32) of the input light, in the direction of the main body (74), while the second reflective surface (82) is formed, in particular, the outer edge surface of the continuation (76).

12. Key according to claim 11, in which the first and second reflective surfaces (66, 82) are arranged such that light that enters the zone (32) of the input light is initially directed at least approximately parallel to the direction (28) actuate the second reflective the surface (82), there is reflected in the direction across the direction (28) of the trigger and sent to the first reflective surface (66), there is reflected in a direction at least approximately parallel to the direction (28) actuation, and then to the area (38) of the light output.

13. Key according to claim 11, in which the first and second reflective surfaces (66, 82) are located at least approximately at an angle (α) between 20° and 70°, preferably between 30° and 60°, more preferably between 40° and 50°, in particular at least approximately 45° relative to the direction (28) of the trigger.

14. The system (12) of the control that contains the screen (14), part (16) of the housing, the circuit Board (18) and the key (20) according to any one of claims 1 to 13, with printed circuit Board (18) has a source (22) of the light and the switching element (24), and key (20) is held with the ability to move on the screen (14) and part (16) of the housing so that the key (20) when the actuation presses the switching element (24) and actuates the switching element (24).

15. Household appliance (10), containing the key (20) according to any one of claims 1 to 13.