Global Patent Index - EP 1316148 A1

EP 1316148 A1 2003-06-04 - CONTROLLER FOR A CAPACITIVE SENSOR

Title (en)

CONTROLLER FOR A CAPACITIVE SENSOR

Title (de)

STEUERUNGSSEINRICHTUNG FÜR EINEN KAPAZITIVEN SENSOR

Title (fr)

UNITE DE COMMANDE DE CAPTEUR CAPACITIF

Publication

EP 1316148 A1 (EN)

Application

EP 01963198 A

Priority

  • GB 0103920 W
  • GB 0021480 A

Abstract (en)

[origin: GB2366385A] A capacitance detector circuit (40) for use in detecting the proximity of objects and as a collision avoidance device in a vehicle comprises a clock (41), providing a first signal (51) to one plate of a capacitive sensor (42) and an out of phase signal (53, 54) to a synchronised rectifier unit (45-49) comprising switches (45, 46), low pass filters (47, 48) and amplifier (49). The clocked capacitor plate is connected to the input of the rectifier unit which produces an output signal dependent upon the capacitance of the sensor which is dependent upon its proximity to objects. Guard electrodes are included for improving sensor performance. The detector circuit is controlled by a microcontroller or by analogue circuitry to produce drive signals. Output signals can be used to produce audible warning signals of object proximity.

IPC 1-7 (main, further and additional classification)

H03K 17/955

IPC 8 full level (invention and additional information)

G01B 7/02 (2006.01); B60R 19/48 (2006.01)

CPC (invention and additional information)

G01B 7/023 (2013.01); B60R 19/483 (2013.01)

Citation (search report)

See references of WO 0219524A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

EPO simple patent family

GB 0021480 D0 20001018; GB 2366385 A 20020306; AU 8423001 A 20020313; EP 1316148 A1 20030604; WO 0219524 A1 20020307

INPADOC legal status


2005-12-28 [18W] APPLICATION WITHDRAWN

- Effective date: 20051108

2003-06-04 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20030401

2003-06-04 [AK] DESIGNATED CONTRACTING STATES:

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2003-06-04 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: AL LT LV MK RO SI