Micropower capacitance-based proximity sensor

H - Electricity – 03 – K

Patent

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Details

H03K 17/955 (2006.01) G01V 3/08 (2006.01)

Patent

CA 2360230

The present invention is a proximity detector for an electronic device (10). The proximity detector utilizes two capacitors (20, 22) which share a common electrode (18). The two capacitors (20, 22) are located on the housing (14) of the electronic device (10). The capacitors (20, 22) are arranged so that when the electronic device (10) is used in its normal orientation, a portion of the operator's body will occlude one of the capacitors (20, 22), but not the other. The close proximity of the operator's body will change the electric field surrouding the capacitor. Thus, the capacitance of the occluded capacitor will be different than the unencumbered capacitor. A detection circuit (24) is coupled to the capacitors (20, 22) and to the power supply (15) of the device. The circuit (24) uses very little power, and maintains the electronic device (10) in a standby or powered down mode. Only when the circuit (24) detects a difference in the capacitance generated by the two capacitors (20, 22), will it allow full power to be delivered to the electronic device (10).

L'invention concerne un capteur de proximité placé dans un dispositif électronique. Ce capteur de proximité utilise deux condensateurs qui partagent une électrode commune. Ces deux condensateurs sont placés dans le logement du dispositif électronique. Les condensateurs sont disposés de sorte que lorsque le dispositif électronique est utilisé selon son orientation normale, une partie du corps de l'opérateur masque l'un des condensateurs, mais ne masque pas l'autre. La proximité du corps de l'opérateur modifie le champ électrique entourant le condensateur. La capacité du condensateur masqué sera donc différente de celle du condensateur libre. Un circuit de détection est couplé aux condensateurs et à l'alimentation du dispositif. Ce circuit utilise très peu d'électricité et maintient le dispositif électronique en mode veille ou hors circuit. C'est uniquement lorsque le circuit détecte une différence dans la capacité produite par les deux condensateurs qu'il délivre la totalité du courant.

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