| 摘要 |
<p>The object of the invention is a rear-vision mirror for autovehicles, in which the mirror holder is angularly movable relatively to a housing (3) around a horizontal pivot axis (X-X) and around a vertical pivot axis (Y-Y) by means of two driving units (AX,AY) which are accomodated in the housing (3) for the mirror holder and are each associated with one of the said pivot axes. The said driving units (AX,AY) comprise each an electric motor (14) which by means of a mechanical transmission (16,15,17,18,21,20) drives a rack (13) arranged substantially at right angles with the mirror holder (1), which is articulatingly connected thereto (at 113) and is guided in the housing (3) for the mirror holder. A control device is provided which allows to move the mirror holder into the required position by having it angularly moved by means of the two electric motors (14) around the one and/or the other pivot axis (X-X, Y-Y), and which also allows to store one or more positions of the mirror holder and to have the same automatically moved into one or the other of these stored positions by means of a selecting respective control and with the aid of detectors (24) of the angular position of the mirror holder around each one of the two pivot axes (X-X, Y-Y). According to the invention, the detector of the angular position of the mirror holder in relation to each pivot axis (X-X, Y-Y) is in form of a potentiometer (24) the actuation of which is derived from a member (20) of the drive between the electric motor (14) and the rack (13) associated with the respective pivot axis, the rack (13) being not disengageably connected to the member (20) for actuating the potentiometer (24), while in the drive between the said member (20) for actuating the potentiometer (24) and the respective electric motor (14) a friction coupling (21) is interposed.</p> |
