Sliding door position measuring device for motor vehicle, has additional tube housing test pattern in passage for connecting test pattern with guiding element, where tube acts as waveguide for waves emitted by transceiver

摘要

The device has a mirror type test pattern (5) integrated with a guiding element (3) of a sliding door, where the guiding element slides in a guiding rail (2). The test pattern is cooperated with a piezoelectric type wave transceiver e.g. diode (6), by interfering with propagation of waves for determining a position of the sliding door at a given instant. An additional tube (4) houses the test pattern in a passage for connecting the test pattern with the guiding element, where the tube acts as a waveguide for the waves emitted by the transceiver.