FR2766608A1 - AUTORADIO CONTROL SWITCH FOR MOTOR VEHICLE - Google Patents

Abstract

The present invention relates to a control system equipped with a movement sensor with detection of the direction of movement, in particular for a car radio control for a motor vehicle, characterized in that it comprises two assemblies (100, 200) of an electrical circuit in mutual contact and capable of relative displacement shaped to define two series of successive electrical interruption / contacting during a relative displacement, the two series of interruption / contacting being offset from each other by a difference different from a step or a half step of interruption / putting in contact.

Description

The present invention relates to the field of

  movement with detection of the direction of movement.

  The present invention applies in particular to the field of

  car radio control switches for motor vehicles.

  However, the invention is not limited to this particular application and can extend to switches, for example switches

  lighting, wiping, speed regulation, under and on steering wheel.

  The object of the present invention is to propose a new simple, economical and reliable system for detecting the direction of movement of a control member, in particular for controlling

  preset stations on a car radio.

  This object is achieved in the context of the present invention thanks to a system comprising two sets of electrical circuits in mutual contact and capable of relative displacement, shaped to define two successive series of electrical interruption / contacting during relative displacement , the two series of interruption / contact being shifted between them by a difference different from one step or half a step

interruption / contact.

  Other characteristics, aims and advantages of the invention

  will appear on reading the detailed description which follows, and

  with regard to the appended drawings, given by way of nonlimiting example and in which - FIG. 1 represents a partial schematic perspective view of a device according to the present invention, - Figures 2a to 2f represent six schematic views of the device to the present invention, in six successive positions of a movable control member, and - Figures 3 and 4 show the evolution of the signals from the device according to the present invention as a function of the angle of rotation of the member control, respectively for a direction of rotation

  trigonometric for figure 3 and in an anti-rotation direction

trigonometric for Figure 4.

  Illustrated in FIG. 1, a radio control switch, in particular for the frequency selection control of preset stations, comprising two sets 100, 200 of circuit

  electric in mutual contact and susceptible to relative displacement.

  According to Figure 1 attached, the first set 100 is formed

  a cursor guided in rotation around an O-O axis.

  This cursor 100 is formed by a ring 110 provided with three external radial arms 120, 122, 124. These arms 120, 122, 124 are equi-distributed around the axis O-O. The sections of the arms 120, 122, 124 adjacent to the ring 110 and connected to the latter are coplanar with the ring 110, that is to say perpendicular to the axis O-O. However, each arm 120, 122, 124 is extended at its free end by a section 121, 123,

  125 folded at 90, that is to say generally parallel to the axis O-O.

  The end of these sections 121, 123, 125 is preferably

  rounded. It is intended to rest on the second circuit 200.

  According to the embodiment shown in Figure 1 attached, this second circuit 200 consists of a printed circuit arranged perpendicular to the axis of rotation O-O. The printed circuit 200 carries different electrically conductive tracks intended to cooperate with the cursor 100. More specifically, the printed circuit 200 carries three tracks

210,220,230.

  In the context of the present invention, the concept of printed circuit board "must be understood in a broad sense, this encompassing any type of support provided with electrically conductive tracks, for example whether it is rigid or flexible, or even overmolded and which whatever the technique

of tracks.

  The first track 210 is formed of a crown sector centered on the axis O-O. The sector 210 covers an angle slightly less than 120 relative to the axis 0-0. The sector 210 is extended by radially external secondary tracks 212 towards a connection terminal 214. Each of the other two tracks 220, 230 comprises a ring sector 222, 232 also centered on the axis 0-0 and covering a slightly smaller angle at 1200 with respect to this axis. The sectors 222, 232 have a smaller radial width than the sector 210 but are however preferably based on an internal radius identical to that of the sector 210. The sectors 222, 232 are moreover provided on their radially external edge with a series of notches 224, 234 with radial orientation towards the outside. Tracks 220, 230 are also also connected, via secondary tracks 226, 236 to terminals

  228, 238 respectively.

  At each track 220, 230, the slots 224, 234 are preferably arranged in a regular pitch and this pitch is identical for the two tracks 220, 230. According to the particular nonlimiting embodiment given in the appended figures, each track 220, 230 includes

  thus four slots 224, 234 arranged in a pitch of 30.

  However, with respect to an arbitrary radial reference point considered opposite the axis OO, the slots 224, 234 of the tracks 220, 230 are offset from one track 220, 230 to the other by a different deviation from the pitch or d 'a

  half not planned between the slots.

  Thus, according to the nonlimiting embodiment given in the appended figures, the slots 224 of the track 220 are offset by an angle of 6 relative to the slots 234 of the track 230 opposite a reference

  arbitrary radial drawn from the axis O-O.

  The ends 121, 123, 125 of the arms 120, 122, 124 of the cursor 100 are located on a radius between the radially internal radius and the radially external radius of sector 210 and between the radius radially

  internal and the radially external radius of the slots 224, 234.

  Thus, for a movement of the cursor 100 around the axis OO, in the anti-trigonometric direction, over an angle of 1200, the arm 124 remains in permanent contact by its end 125 on the sector 210, while the other two arms 120, 122, by their ends 121, 123 are located alternately on slots 234, 224 of tracks 230, 220 or between these slots. Conversely for a rotation in the counterclockwise direction, the arm 122 comes to rest on the track 210 while the arms 120 and 124 are

  located alternately on slots 224 and 234 or between these slots.

  Thus, the rotation of the cursor 100 around the axis O-O, on 120, defines two series of electrical interruption / connection between the connection terminal 214 linked to the sector 210 and respectively the terminals of

  connection 228, 238 linked to tracks 220, 230.

  If we assume that a positive voltage is applied to terminal 214, we thus collect on terminals 228, 238 series of slots

  tension as illustrated in Figures 3 and 4.

  More precisely, in FIGS. 3 and 4, the signal collected on terminal 228 is illustrated on the top line and on the bottom line the signal

collected on terminal 238.

  It will be understood from the comparative examination of FIGS. 3 and 4 that these signals change as a function of the angle of rotation of the cursor 100 and the

direction of rotation thereof.

  FIGS. 2a, 2b, 2c, 2d, 2e, 2f have illustrated six successive positions of the cursor 100 relative to the tracks 200, separated from each other by an angle of 6. The representations given in FIGS. 2 thus correspond to the movement of the cursor 100 over an amplitude

  total equal to one step of the slots compared to tracks 200.

  It will be noted on examining FIG. 3 that in the case of a trigonometric direction of rotation, the voltage slots detected on the terminal

  228 precede those detected on terminal 238.

  Conversely, in the case of an anti-rotation direction

  trigonometric for cursor 100, the voltage slots detected on

  terminal 228 precedes those detected on terminal 238.

  Of course the present invention is not limited to the particular embodiment which has just been described, but extends to any variant

conforms to his spirit.

  We can for example remove the common track 210 by ensuring a direct connection of the common terminal on the cursor 100, for example by means of an electrically spiral element

driver or equivalent.

  If necessary, the system can have more than two tracks

crenellated.

  The pitch of the slots 224, 234 is not limited to the pitch of 30 illustrated in the appended figures. It is the same for the number of slots which is not limited to the number of four illustrated in the attached figures. Furthermore, if necessary, the arrangement illustrated in the appended figures can be reversed in the sense that the printed circuit 200 could be equipped with simple point contacts equivalent to the ends 121, 123, 125 of the cursor 100 illustrated in appended FIG. 1, while the latter would be equipped with equivalent crenellated contact arms

  to the arrangements illustrated in FIG. 1 for the printed circuit 200.

  In addition, if according to the embodiment illustrated in the figures, the arms 120, 122, 124 define multiple angular openings of the pitch of the slots 224, 234 and the phase shift making it possible to detect the direction of rotation results from the angular offset existing between the slots 224, 234 of the two tracks 220, 230, as a variant, one could envisage arranging all of the slots 224, 234 equally distributed with a regular pitch

  around the axis 0-0 and using cursor arms 120, 122, 124 unevenly

  distributed so that the sequences of signals detected on terminals 228,

  238 differ according to the direction of rotation of the cursor 100.

Claims (10)

  1. Control system equipped with a displacement sensor with detection of the direction of displacement, in particular for a switch command, characterized in that it comprises two sets (100,) of electrical circuit in mutual contact and capable of displacement relative, shaped to define two successive electrical interruption / contacting series during relative movement, the two interruption / contacting series being offset from one another   different from a step or a half step of interruption / contacting.   2. System according to claim 1, characterized in that   one of the two assemblies (100) is guided in rotation.   3. System according to one of claims 1 or 2, characterized by   the fact that one of the two assemblies (100) is formed by a movable cursor comprising at least two arms (120, 122) resting elastically respectively on crenellated tracks (220, 230) carried by the second together (200).   4. System according to claim 3, characterized in that it further comprises at least a third track (210) on which rests   permanently an arm (124) of the movable assembly (100).   5. System according to one of claims 3 or 4, characterized by   the fact that each track (210, 220, 230) has an angular opening   of the order of 1200 with respect to the axis of rotation.   6. System according to one of claims 3 to 5, characterized by   the fact that the slots (224, 234) of the two tracks (220, 230) are offset from each other by a difference of one step or half a step while the arms respectively associated (120, 122) of the mobile assembly present   between them a multiple deviation from the pitch of slots (224, 234).   7. System according to one of claims 1 to 5, characterized by   the fact that the slots (224, 234) are equi-distributed with a constant pitch on the path of movement of the mobile assembly (100), while the cooperating arms (120, 122, 124) of the mobile element ( 100) are positioned with a variable step according to this path.   8. System according to one of claims 1 to 9, characterized by   the fact that it includes means adapted to apply a tension   directly on the mobile assembly (100).   9. System according to claim 1, characterized in that it comprises a fixed circuit having point contacts cooperating with an element (100) mounted for displacement having elastic crenellated contact arms.   10. Application of the system according to one of the claims   1 to 9, when controlling a motor vehicle switch, in particular a motor vehicle radio for the selection of preset stations.