DE10121909A1 - Ventilation device for vehicles, especially in combination with heating or air conditioning system, has electrical operation of devices for air quantity and direction control for air outlet - Google Patents

Abstract

The ventilation device has air flow channels and at least one air outlet with at least one device for controlling the air direction and at least one air quantity controller. At least the devices for air quantity control and air direction control of the air outlet can be electrically operated. The control devices are moved by electric motors, especially stepper motors or DC motors.

Description

The invention relates to a ventilation device for vehicles, in particular in connection with a heating or air conditioning system, with air flow channels and at least one Air vents with at least one device for controlling the air direction and Air volume.

Such a ventilation device is already known from DE-OS 199 56 259 A1. Conventional automotive heating and air conditioning systems use air vents, which are manual have adjustable elements for air volume and air direction control. These are arranged decentrally and each can be operated or controlled locally. Therefore there is none Remote control given and the heating or air conditioning system cannot control the air vents use it automatically to improve the ventilation functions. So in part existing heating / air conditioning functions such as B. the deicing of Depending on the setting of the air vents, panes may not be designed optimally. It can in addition, the case may occur that the user manually adjusts all adjustable air vents has closed and the heating / air conditioning these air vents for ventilation of the Interior uses. Depending on the tightness of the air vents, this leads to annoying air noise such. B. whistle or even to interrupt the Fresh air. In this case, windows can fog up and the oxygen content in the Vehicle drop unnoticed, which consequently limits the Driver's ability to concentrate. Furthermore, comfort functions such as driver-dependent memory settings are not extended to the air vents, which always requires manual adjustment by the driver or the occupants remains.

It is therefore an object of the present invention to provide a ventilation device for a To represent motor vehicle, which is an electrical actuation of the elementary functions the air vent has and thus the above. Overcomes disadvantages.

This object is achieved in that at least the air volume and the air direction control is electrically controllable within air vents are what z. B. in connection with the functions of a heating or air conditioning system rapid deicing of the window panes and heating of the interior is made possible.  

Further developments of the invention are presented in the subclaims.

It is proposed to equip the air vents with motor drives, whereby especially the use of stepper motors due to their precise positioning ability and their simple digital control comes into question. So each of the three can Elementary functions air direction control up / down, air direction control right / left and Air volume control can be assigned to a separate engine, one engine via Coupling elements take over several functions or a combination engine with several Output shafts are used.

A modular structure is advantageous here, in particular for linking to other function modules, which depending on the level of equipment of the vehicle only the required functional modules are installed and made available can. This leads to weight and cost savings in all under-equipped ones Air vents. In addition, a possible later service of the unit in the event of a Maintenance or expansion easier. The modular structure is through the use interfaces of the same kind which enable mechanical and electrical interfaces Ensure the compatibility of the individual modules.

An important part of the concept of electrically operated air vents is the electrical connection to the air conditioning system and operation of the functions.

The use of a data bus is proposed for the electrical connection, since this due to the large number of possible drives per vehicle and the various Individual functions per air vent for cost, space, weight and service reasons is preferable to individual cabling. In particular, the number of single wires to supply 12 (4 lines per motor, 3 motors per air vent) reduce to 3 (+ supply, ground, bus signal), in addition the supply line can be in one Loop or branch line are looped through instead of star-shaped individually from the Control must be relocated to each drive.

In principle, synergies with other electrically operated systems can also be achieved Elements such as B. achieve rear-view mirrors, because in addition to a continuous bus Wiring also common controls used for different functions can be so. B. Multi-quadrant controls for the movements up / down and Left Right. This leads e.g. B. to reduce control buttons in the vehicle what the  Standardize operation and additional space in the interior for further design Can create features.

Coupling with the central control of the air conditioning system also makes it very easy easily achieve functional logical links, e.g. B. automatic alignment of the air nozzles in the direction of the panes with the defrost setting on the Air conditioning. Furthermore, user-selectable presets for the air vents can be realized in connection with the air conditioning system, in particular for the operation To facilitate drivers. In this context, special attention should be drawn to the possibility, also from the driver Manually not directly accessible air vents to operate, which z. B. direct drafts can be reduced by using the air vents in the rear instead of the front area for ventilation be used.

The possibility of an electrical actuation of air vents, however, raises the question of how the user can recognize the current settings and the progress during the adjustment. There are basically two possible options:

• A) If the structure of the air vents is selected so that the drives are from the outside can be moved manually, the adjustment can be made directly on the air vent as usual respectively. The respective drive motor can then even replace the conventional one Systems deliberately built-in friction serve, whereby the operation through the gentle Locking the stepper motor is particularly user-friendly. The control must, however Always know the position of the elements for air volume control and air direction control, even if manually adjusted. This can be achieved by the induced Voltages of the motor windings can be evaluated or by using Hall sensors in combination with the rotor or additional magnets to change the direction and number of To capture steps relatively. However, this requires permanent connection of the motors to the functional elements of the air vent, whereby z. B. a multiple use of a Motor and mechanical coupling or uncoupling of the function to be controlled is not possible. As an alternative to the relative counting of the individual steps, the use of absolute encoders is also possible such as B. assigned potentiometers or equivalent voltage dividers, Angle encoders, metal surfaces assigned to discrete positions and contacts thereon electric grinders or differential transformers conceivable. You have the advantage that no initialization runs are required. However, with regard to the Component costs and costs are usually disadvantages. They are also used from analog absolute encoders such as B. Potentiometers inherent tolerances Consider non-linearity noise and wear. They also require if they are coupled with a digital controller, additional analog-to-digital converters. The  The general advantage of this version is that the user does not have to operate it must change and can adjust manually in the usual way. Here is also the. Detection of the actual position is not a problem, as it is directly on the adjustment buttons of the respective air vents can be seen.
• B) Is the structure of the air vents designed so that the functions are not mechanical are adjustable, e.g. B. with self-locking drives, the servo tracking Motors the desired movement can be achieved. Here, for the Air direction control a tactile control element as a control button directly on the air vent be used, which moves with the elements of the air direction control. However, the tactile control element has 4 sensors internally, in the simplest case Pushbuttons that lightly press the button in the directions up, down, left and right to capture. Combinations like left and above are also possible. The received here Electrical signals are preferably sent to the central controller via the data bus passed on, which sets the assigned adjusting motors in motion. The movement continues until the user releases the button, the direction changes or the mechanical end of the adjustment path has been reached. It is still conceivable to have one z. B. from clocks and keyboards known sequence use, so that at the beginning Individual adjustment only by a few motor steps and after a short dwell time continuous movement takes place. Due to the configuration described, each motor is Able to know their position at all times, since only electrical adjustments are made internally. Depending on the need to detect manual adjustments, e.g. B. by manual Overpressing the electrical adjustment can also be the one described in case A) Complete evaluation done. Alternatively, with a simpler diagnostic function, z. B. by evaluating induced voltage peaks in only one motor coil, the Fact of a step loss, regardless of its cause and direction, detected and then the target position after an initialization run from stop to Stop can be restored. This version has the same as that described under A) Advantage that the user practically does not have to change the operation and in can adjust manually as usual. Furthermore, the detection of the actual position no problem, as they are directly on the adjustment knobs of the respective air vents can be seen. A comparable approach is conceivable for air volume control, whereby instead of the above-mentioned multi-quadrant control element, a simulated adjustment wheel for Can be used, which basically works in the same way as above described, but only in one level (open / closed).
• C) If there is no direct manual adjustment directly on the air vent the mechanically coupled control knobs or setting wheels can also be omitted  conceivable. In this case, a self-locking actuator or equivalent Proposed friction to the position of the elements for air direction and Keep air volume control safe. However, a system is also required which visualizes the current actual positions of these elements for the user. It will Recommended to have a visual display for each of its three near the outlet of the air vent Elementary functions air direction control up / down, air direction control left / right and Install air volume control. These can each z. B. in the form of a bar LEDs, a mechanical pointer or foil displays, or the like. The status of each air vent can be seen at a glance. Alternatively, you can the display can also be integrated into an existing central display, e.g. B. in the area of Dashboard. The individual air vents and their status can be checked here Pictograms are shown. In addition, the All functions of the air vents can be operated, either by manual or by voice input.

Embodiments of the invention are shown below with reference to the drawing. Show it:

Fig. 1 is a 3D schematic diagram of a ventilation device,

Fig. 2 is a schematic representation of a part of the ventilation device, including several electric drive elements for the functions Luftrichtungs-, air volume control, and other functional modules,

FIGS. 3a to 3d are schematic representations of a device for actuating the Luftrichtungs- and air volume control,

Fig. 3e and 3f are schematic diagrams for selection of operable air vent in the form of an adjusting wheel and keypad,

Fig. 4a is a schematic representation of the control of the electrically operated air vents, including the central control unit of the heating / air conditioning, controls and an optional coupling z. B. an electrically controllable exterior mirror to this control,

FIG. 4b is a block diagram for controlling a bipolar stepping motor comprising bus interface, control logic and output stage,

Fig. 5 is a schematic representation of a control panel of a heating / air conditioning, with additional buttons P1 and P2 on which the user different preferential save settings and recall can,

FIG. 6a is a schematic representation of a portion of an air vent with a tactile actuator which can be used below the right and left to control the direction of air flow, at least upwardly,

Fig. 6b as a schematic representation of a detail of the tactile actuator element with control button (in section), buttons and support member,

Fig. 7a and 7b are schematic representations of a portion of the air outlet, optionally with a tactile actuator, and optical indicators for the current setting of Luftrichtungs- and air flow control. Fig. 7a shows discrete display elements, for example. B. LEDs,

Fig. 7b continuously variable, z. B. pointers or foils,

Fig described. 7c the same functions as in Figures 7a and 7b, but as the display functions within a display

Fig. 7d exemplary pictograms to illustrate various air direction settings.

Fig. 1 is a 3D schematic diagram shows an aeration device 1, with air vent 4, means for controlling air direction top / bottom 5, left / right air direction control 6 and 7, and airflow passageways and heating or air conditioning.

FIG. 2 shows a schematic representation of a part of the ventilation device, including electric drive motors for the functions air direction control top / bottom 11, left / right 10, air volume control 12 , and further optional function modules decentralized heating device 8 and fan module 9 .

Fig. 3a to 3d show schematic representations of a device for actuating the Luftrichtungs- and air flow control. Fig. 3a shows a 4-quadrant rocker button 13 for selecting the air direction, a two-stage slide switch 14 for selecting the mirror or air vent to be operated (left / right) and a two-stage slide switch 14 'for choosing between the operation of mirrors and air vents. As a further embodiment, Fig. 3b shows a convex spherical 4-quadrant control element 15 for air direction selection or mirror adjustment, which z. B. always resets to the center by spring force (as shown) and gives the control signals for movement during manual deflection. Furthermore, 3b shown in FIG. 16 with a rotary switch for selecting the four positions to be operated air vent (far left / center left / center, right / right). Such functions and combinations of these can be used to control all functions of any number of air vents in the vehicle, that is to say also in the rear, headliner, etc. A setting wheel 17 is shown in FIG. 3c, which can be used in particular to select the amount of air. This can also be solved in detail in such a way that the setting wheel is only designed as a segment which, for. B. is held by spring force in the central position. The user then moves the wheel segment up or down against the weak spring force. B. via electrical contacts, buttons, optical or magnetic sensors, a control signal is generated, which in turn changes the air volume by moving the air volume control flap via the control. As an alternative to this, the direct selection via keys shown in FIG. 3d can also be used. In both cases, single-step or jog mode or continuous adjustment can be achieved through long operation.

Fig. 3e and 3f are schematic diagrams for the selection of actuating the air vent in the form of a control wheel 17 'and the keypad 18'. This allows more than two elements to be clearly selected in the smallest space, with the pictograms visualizing the assignment of the switch positions or buttons to the position of the air vents. Basically, such selector switches can also be extended to other elements to be controlled, e.g. B. rearview mirror, so that separate selector switches 14 , 14 'can be omitted.

Fig. 4a shows the topology of an electronically networked controller 26 , 27 of several air vents 20 , 21 , 23 , 24 and other elements such as. B. a rearview mirror 19 via a data bus 25 , 28th The operation takes place via control elements 26 , which, as shown, are arranged directly on the control device 27 , or likewise communicate with the control via the data bus 25 , 28 and are accommodated in a decentralized manner. Control electronics are assigned to each decentralized element, which takes over the communication with the data bus and possibly includes further electronic components. The continuation 28 of the bus to further peripherals symbolizes the open structure and expandability of this architecture without requiring additional connections to the controller 27 . The bus line can be really branched or arranged in a ring shape. The low data rates required due to the relatively slow processes allow a simple and inexpensive bus concept, e.g. B. based on LIN bus according to ISO 9141 .

FIG. 4b shows a basic circuit diagram which describes the control electronics 29 of a bipolar drive stepper motor with the coils 30 and 30 'operated on a data bus. It comprises a data bus interface 32 'for receiving and sending bus data with a connecting element, e.g. B. plug, a control logic 32 with optional diagnostic functions and a driver module (output stage) for controlling the drive motor. Lines 31 and 31 'are also shown for the diagnostic function, which allow the voltages of both coils to be recorded directly. This can e.g. B. can be used to detect an unwanted external actuation of the stepper motor by evaluating the voltages induced and the phase shifts between the two coils for direction detection.

Fig. 5 shows a schematic diagram of a control panel 33, 33 'of a heating / cooling unit, each with 2 additional buttons P1 and P2 for driver 34, 35 and passenger 34', 35 '. The driver or front passenger can save and call up two different preference settings on each, for example a diffuse comfort setting for long journeys and a second with a directed air flow for more cooling or heating. Since the buttons can be located in the control panel of the air conditioning system, it is also very easy to save other functions of the air conditioning system such as temperature, distribution, fresh air, etc. at the same time.

FIG. 6a shows a schematic representation of a portion of the air vent 36 with a tactile actuator 37, which can be used for controlling the air direction at least up, down 38, right and left. 39 By tapping it gently in the desired direction, it effects an appropriate electrical adjustment internally.

Fig. 6b shows a schematic representation of a detail of the tactile actuator element with control button 61 (in section), buttons 62 and support member 63. The carrier element is mechanically connected to the devices for controlling the air direction and thus has the effect that the actuating element always moves with it. The buttons are arranged internally in all four adjustment directions, ensure that the actual control button is floating and are actuated by tapping the button. The signal transmission to the stationary control can, for. B. via flexible ribbon cables, where five wires are sufficient, consisting of a common supply and four outputs of the buttons.

Fig. 7a and 7b are schematic illustrations of a portion of the air vent 36 ', optionally with a tactile actuator 37', and for visually indicating the current setting of Luftrichtungs- 40, 41 and air flow rate controller 42. Fig. 7a shows discrete display elements, for example. B. LEDs, Fig. 7b continuously variable, z. B. pointers or foils. Equivalent forms of display are also possible, e.g. B. the supply of light signals from located on the decentralized control light sources via light guides to the visible display elements.

Fig. 7c shows the same functions as already described 7a and 7b, but as the display functions within a display. The individual selectable air vents are represented symbolically as pictograms 46 , 47 , 48 , 49 . The positions of the air vents shown can be marked using cursor 50 and then controlled. For the control of the selected air vent, a possibly enlarged pictogram 52 , 52 'is available, in which further symbols can be shown. These can, for example, represent the control element 51 , 51 'or be symbolized by arrows 53 , 53 '. The control can then be carried out using a separate multi-quadrant control element (analog 13, 15), or using the "+/-" or "up / down" keys or voice control by calling up the positions in series. It is suggested that the "down" position be followed by the "off" 60 position, or the "top" 58 position is the "middle" position 59 . A higher resolution and clarity can be achieved if the extreme values such as "left" 57 or "top" 58 are followed by two arrows, ie "left" and "top left", then "top left", then "left" top "and" top ", then" top u etc. The air volume control can also be operated using separate "+/-" or "up / down" buttons or corresponding symbols 55 , 56. The current air volume setting can be displayed using a bar graph Displays are made as shown by way of example under 54, 54 'and 54 ".

Fig. 7d shows an example of selected icons showing various airflow direction settings. In addition to the individual directions "left" 57 and "top" 58, the settings "center" 59 and "off" 60 are also shown.

LIST OF REFERENCE NUMBERS

1

aeration device

2

Heating / air conditioning

3

Airflow channels

4

air vents

5

Air direction control device (top / bottom)

6

Air direction control device (left / right)

7

Air volume control device

8th

decentralized heating device

9

further modules (fan module)

10

Drive motor for controlling the air direction (left / right)

11

Drive motor for controlling the air direction (top / bottom)

12

Drive motor for controlling the air volume

13

Rocker button for selecting the air direction

14

Air outlet selection switch

14

'' Switch to choose between mirror and air vent

15

Ball setting wheel for choosing the air direction

16

Rotary switch for selecting the air vent

17

Setting wheel for air volume control

17

'' Setting wheel for selecting the air vent

18

Air volume control keypad

18

'' Keypad for selecting the air vent

19

Rearview mirror, outside

20

Air vents, outside left

21

Air vents, center left

22

control electronics

23

Air vents, center right

24

Air vents, outside right

25

bus

26

operating element

27

Air conditioning control

28

Data bus, continuation to further peripherals

29

Example block diagram of control electronics for bipolar stepper motor

30

.

30

' Kitchen sink

1

and

2

(Stepping motor)

31

.

31

'' Diagnostic lines for coil

1

and

2

(Stepping motor)

32

Control / diagnostic part of the control electronics

32

'' Control electronics bus interface

33

.

33

'' Air conditioning control panel (left, optional right)

34

.

34

'' Selection key for first user preference setting P

1

(left, optional right)

35

.

35

'' Selection key for second user preference setting P

2

(left, optional right)

36

air vents

37

Tactile control

38

Direction of movement of the tactile control element (top / bottom)

39

Direction of movement of the tactile control element (left / right)

40

visual indication of the air direction (top / bottom)

41

visual indication of air direction (left / right)

42

optical display of the air volume setting

43

mechanical display of air direction (top / bottom)

44

mechanical display of air direction (left / right)

45

mechanical display of the air volume setting

46

Display: symbol for selection of air vent on the left outside

47

Display: symbol for selection of air vent in the middle left

48

Display: symbol for selection of air vent in the middle right

49

Display: symbol for selection of air vents on the right outside

50

.

50

'' Display: Cursor to select the air vent to be controlled (active / deactivated)

51

.

51

'Display: "Control element" symbol for showing the air direction (active / deactivated)

52

.

52

'' Display: symbol for air vent control

53

.

53

'Display: "Arrow" symbol for showing the air direction (active / deactivated)

54

Display: "Points" symbol for displaying the selected air volume

55

Display: "Bar" symbol for displaying the selected air volume

56

Display: "Bar graph" symbol for displaying the selected air volume

57

Displ !! des Sy: Example of the "arrow" symbol to indicate the air direction "left"

58

Display: Example of the "arrow" symbol to indicate the air direction "up"

59

Display of the Sy: Example of the "arrow" symbol to show the air direction "center"

60

Display: Example of the "arrow" symbol to show the air direction when the air volume is set to "off"

61

tactile control element: detail control button

62

tactile control element: button detail

63

tactile control element: detail of support element, coupled to the mechanics of the air vent

Claims (20)

1.Ventilation device ( 1 ) for vehicles, in particular in connection with a heating or air conditioning system ( 2 ), with air flow channels ( 3 ) and at least one air vent ( 4 ) with devices for controlling the air direction ( 5 , 6 ) and the air volume ( 7 ), characterized in that at least the devices for air quantity control ( 5 , 6 ) and for air direction control ( 7 ) of the air vent ( 4 ) can be actuated electrically. 2. Ventilation device according to claim 1, characterized in that the movement of the devices for air direction ( 5 , 6 ) and / or air volume control ( 7 ) by electric motors ( 10 , 11 , 12 ), preferably stepping or DC motors. 3. Ventilation device according to claim 1 or 2, characterized in that the position of at least one device for air direction ( 5 , 6 ) and / or air volume control ( 7 ) is evaluated internally as a controlled variable, by counting the individual steps, preferably in stepper motors, by the Devices assigned potentiometers or equivalent voltage dividers, encoders, Hall sensors in combination with magnets or integrated in the motor, discrete positions assigned metal surfaces and electrical grinders or differential transformers contacting them. 4. Ventilation device according to at least one of the preceding claims, characterized in that at least two functions of the air vent ( 4 ) are designed as modules ( 5 , 6 ), in particular for linking to other modules ( 7 , 8 , 9 ), preferably in conjunction with a supply based on an increased vehicle electrical system voltage, in particular 42 V. 5. Ventilation device according to at least one of the preceding claims, characterized in that the selection of the air vents ( 4 ) to be controlled is carried out via at least one control element ( 26 ) which is not directly mechanically associated with the air vents, preferably via switches ( 14 , 16 ), selection buttons ( 18 '), Setting wheel ( 17 '), menu options ( 46 , 47 , 48 , 49 , 50 , 50 ') and / or voice control. 6. Ventilation device according to at least one of the preceding claims, characterized in that the control of at least the air volume control ( 7 ) by means of an operating element, in particular at least one setting wheel ( 17 ) or keypad ( 18 ), a menu option ( 54 , 54 ', 54 ", 55 , 56 ) and / or voice control. 7. Ventilation device according to at least one of the preceding claims, characterized in that the control of at least the air direction control ( 5 , 6 ) by means of at least one multi-quadrant control element, in particular at least one ball adjusting wheel ( 15 ), a rocker button ( 13 ), menu option ( 51 , 51 ', 53 , 53 ') and / or voice control. 8. Ventilation device according to at least one of the preceding claims, characterized in that the control of at least the air direction control by means of at least one multi-quadrant control element already present for at least one other function, preferably electrically adjustable rear view mirror ( 19 ), in particular at least one ball adjusting wheel ( 15 ), a rocker button ( 13 ), menu option ( 51 , 51 ', 53 , 53 ') and / or voice control is used in conjunction with at least one selection element ( 14 ') to select the function to be controlled. 9. Ventilation device according to at least one of the preceding claims, characterized in that at least one air vent has an electronic control ( 22 ) which controls at least one, preferably all functions of at least this air vent. 10. Ventilation device according to claim 9, characterized in that at least one, preferably a plurality of air vents has an electronic bus control ( 20-25 ). 11. A ventilation device according to claim 10, characterized in that at least one electrically controllable rear-view mirror and at least one air vent (20), in particular arranged spatially close to the rear view mirror (19), a common electronic bus control (19, 20, 25, 28). , 12. Ventilation device according to claim 9, 10 or 11, characterized in that the controller ( 27 ) of at least one air vent ( 20 , 21 , 23 , 24 ) has a memory function which stores at least 2 independent settings of at least one function and on demand , manually or automatically electronically triggered, can restore, preferably in conjunction with an existing memory function, at least for electrically adjustable rear view mirrors or seat adjustments. 13. Ventilation device according to claim 9, 10 or 11, characterized in that the control ( 27 , 33 , 33 ') of at least one air vent has a memory function, which at least two independent settings ( 34 , 35 ) for the driver, preferably also separately for the co-driver ( 34 ', 35 '), save and restore on demand. 14. Ventilation device according to claim 13, in connection with a memory function Claim 12. 15. Ventilation device according to at least one of the preceding claims, characterized in that the control of at least one air vent ( 36 ) via at least one tactile control element ( 37 ), which is mechanically coupled to the same and moves with at least one element of the air direction control, over Has sensor elements and controls the adjustment function in the direction desired by the user ( 38 , 39 ). 16. Ventilation device according to at least one of the preceding claims, characterized in that the control ( 29 ) of at least one air vent has an electronic diagnostic function ( 31 , 31 ', 32 ), in particular the detection of unwanted steps, for example caused by manual adjustment, at least a drive stepper motor ( 30 , 30 ') and the resulting reinitialization to restore the target position. 17. Ventilation device according to claim 16, characterized in that the detection of unwanted steps with permanent coupling of at least one drive stepper motor ( 30 , 30 ') to devices for air volume or air direction control by evaluating the voltages induced in said stepper motor ( 31 , 31 ') ) he follows. 18. Ventilation device according to claim 16 or 17, characterized in that the diagnostic function of the controller ( 32 ) triggers a reinitialization to restore the desired position after the occurrence of a currentless state, in particular "ignition off". 19. Ventilation device according to at least one of the preceding claims, characterized in that the feedback of the current settings of the air direction and air flow control elements of the air vents ( 36 ') to the user, in particular in the case of flap positions which are not or difficult to recognize externally, is provided via optical displays, for example via LED displays ( 40 , 41 , 42 ), mechanical pointers or foils ( 43 , 44 , 45 ), or via a symbol or graphic display ( 51-53 , 51 '- 53 ', 57-60 , 54 , 54 ', 54 "), preferably integrated into existing displays such as the instrument panel or electronic equivalents. 20. Ventilation device according to claim 19, characterized in that the light sources used for the illumination and / or display, in particular LEDs, are accommodated locally in the electronic control ( 32 ), the optical signal reaches the user via at least one light guide and the Supply takes place directly via the control mentioned.