Proximity sensor

Details Proximity sensor Proximity sensor

2011-05-31

2011-05-31

Nguyen, Hoai-An D (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C340S545400

Reexamination Certificate

active

07952366

ABSTRACT:
A capacitive touch sensor providing an automatic switch-off function for an apparatus in which the sensor is incorporated is provided. The sensor includes a sensing element coupled to a capacitance measurement circuit for measuring the capacitance of the sensing element. A control circuit is operable to determine from the capacitance measurement whether an object is in proximity with the sensor. The determined presence of an object may he used to toggle a function of the apparatus. Furthermore, when it is determined that an object has not been in proximity with the sensor for a predetermined time duration, an output signal for switching off the apparatus is provided. The predetermined time duration may be selected from a number of predefined time durations, or may be programmed using a resistor-capacitor network. Pulses may be applied to the control circuit to override features of the automatic switch-off functionality.

REFERENCES:
patent: 5730165 (1998-03-01), Philipp
patent: 6452494 (2002-09-01), Harrison et al.
patent: 6452514 (2002-09-01), Philipp
patent: 6466036 (2002-10-01), Philipp
patent: 7091727 (2006-08-01), Lee
patent: 7567088 (2009-07-01), Yoshida et al.
patent: 7714595 (2010-05-01), Fujiwara et al.
patent: 7797115 (2010-09-01), Tasher et al.
patent: 2003/0132763 (2003-07-01), Ellenz
patent: 2006/0250142 (2006-11-01), Abe
patent: 2007/0062739 (2007-03-01), Philipp et al.
patent: 2007/0076897 (2007-04-01), Philipp
patent: 2009/0027068 (2009-01-01), Philipp et al.
patent: 1 536 314 (2005-06-01), None
patent: 1536314 (2005-06-01), None
patent: 2 431 725 (2007-05-01), None
patent: 2431725 (2007-05-01), None
UK Intellectual Property Office, Search Report in GB 0813682.2, mailed Nov. 4, 2008.
Datasheet “QT100—Charge Transfer IC” Quantum Rearch gp. Published 2006.
Datasheet “QT110 Touch Sensor IC” Quantum Research Group, published 2004.

Affiliated with

Also associated with

Rating

Proximity sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Proximity sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Proximity sensor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2619682