Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2002-05-10
2004-03-02
Le, N. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S658000, C324S660000, C324S686000
Reexamination Certificate
active
06700393
ABSTRACT:
BACKGROUND
The present disclosure relates generally to proximity detecting systems and, more particularly, to a capacitive sensor assembly for use in a non-contact obstacle detection system, such as may be implemented in conjunction with a motor vehicle power lift-gate, power operated device, or perimeter system.
Various systems have been devised for detecting obstacles in the path of a moveable panel such as an automotive power window, power sliding door or power hinged door. When an obstacle is detected, forward movement (e.g., closing) of the panel is interrupted and, optionally, the movement of the panel may be thereafter reversed (e.g., opened). These detection systems may generally be characterized as either “contacting” or “non-contacting”. In a contacting system, an obstacle is detected only after some form of physical contact occurs between the panel and the obstacle, and may include devices such as pneumatic/pressure sensitive strips, or possibly sensors responsive to changes in mechanical or electrical loading in the apparatus that moves the panel.
On the other hand, in a non-contacting system, an obstacle is detected before actual contact occurs. One specific type of non-contacting obstacle detection system employs the use of a capacitive element(s) as a proximity sensor(s). Capacitive proximity sensors may include one or more electrical conductors formed along the leading edge of a moveable panel, as well as a capacitance sensitive circuit (e.g., a bridge circuit or an oscillator) coupled to the conductor(s). An obstacle (e.g., a human hand) in proximity to the conductor(s) changes the capacitance of the sensor, and the change is thereafter detected by the capacitive sensitive circuit.
Unfortunately, certain problems may arise in creating an appropriate capacitive proximity sensor having the requisite nominal, steady-state capacitance desired for high-sensitive applications, such as the non-contacting obstacle detecting system described above. First, the nominal capacitance value of a capacitive sensing device is inherently dependent upon (among other parameters) the physical dimensions and relative positions of the capacitor electrodes with respect to one another. More specifically, the degree to which the capacitor electrodes are dimensionally consistent with one another along their length will have an effect upon the characteristics of the device. Given the fact that a sensor could be located upon a contoured surface such as a vehicle pillar, panel or moveable lift-gate, the prospect of forming a reliable, sensitive capacitive proximity sensor can therefore be difficult.
Furthermore, it may also be desirable for the sensor to be located in a “tight” area that effectively limits the profile of the sensor, and/or provided in an outdoor setting (such as upon a motor vehicle) that is necessarily exposed to moisture. These variables also have an effect on capacitance and, as such, should be taken into account when designing a high-sensitivity, precision capacitive proximity sensor.
SUMMARY
The above discussed and other drawbacks and deficiencies of the prior art are overcome or alleviated by a capacitive sensor assembly. In an exemplary embodiment, the assembly includes a capacitive strip having an elongated body for flexible mounting to a panel along a bottom surface of the elongated body. A first elongated planar conductor is contained within an upper section of the elongated body, while a longitudinal cavity is formed through a central portion of the elongated body. The longitudinal cavity is disposed between the planar conductor and the bottom surface. A capacitance detector module is inserted within the longitudinal cavity, the capacitance detector module including a capacitance detector circuit therein that is coupled to the first elongated planar conductor.
In a preferred embodiment, the first elongated planar conductor is a first electrode of a sensing capacitor coupled to the capacitance detector circuit. The longitudinal cavity comprises a portion of a dielectric material of the sensing capacitor. In addition, the panel comprises a second electrode of the sensing capacitor. The planar conductor is preferably a flexible material, such that a substantially constant distance is maintained between the first elongated planar conductor and the panel. The elongated body is formed by extrusion of an insulating material such as santoprene rubber.
In another aspect, the capacitance detector module further includes a printed circuit board and a shielding structure for shielding radiated emissions generated by devices contained within the printed circuit board. A terminal clip electrically connects the printed circuit board with the first elongated planar conductor. A first end of the terminal clip is attached to a back side of said printed circuit board, and a second end of the terminal clip is attached to the first elongated planar conductor. The shielding structure further includes a first shield for shielding a first oscillator included within the printed circuit board, and a second shield for shielding a second oscillator included within the printed circuit board.
REFERENCES:
patent: 4327323 (1982-04-01), Walker
patent: 4351016 (1982-09-01), Felbinger
patent: 4410843 (1983-10-01), Sauer et al.
patent: 4453112 (1984-06-01), Sauer et al.
patent: 5027552 (1991-07-01), Miller et al.
patent: 5089672 (1992-02-01), Miller
patent: 5287086 (1994-02-01), Gibb
patent: 5296658 (1994-03-01), Kramer et al.
patent: 5327680 (1994-07-01), Miller
patent: 5394292 (1995-02-01), Hayashida
patent: 5428923 (1995-07-01), Waggamon
patent: 5463378 (1995-10-01), Gibb
patent: 5473461 (1995-12-01), Miremadi
patent: 5484477 (1996-01-01), George et al.
patent: 5651044 (1997-07-01), Klotz, Jr. et al.
patent: 5790107 (1998-08-01), Kasser et al.
patent: 5801340 (1998-09-01), Peter
patent: 5832772 (1998-11-01), McEwan
patent: 6006386 (1999-12-01), Mohaupt
patent: 6025782 (2000-02-01), Newham
patent: 6078014 (2000-06-01), Kashiwazaki et al.
patent: 6158170 (2000-12-01), Brodowsky
patent: 6166381 (2000-12-01), Augeri et al.
patent: 6229408 (2001-05-01), Jovanovich et al.
patent: 6263199 (2001-07-01), Wortel et al.
patent: 6275048 (2001-08-01), Milli
patent: 6282413 (2001-08-01), Baltus
patent: 6288640 (2001-09-01), Gagnon
patent: 6297605 (2001-10-01), Butler et al.
patent: 6321071 (2001-11-01), Pekkarinen et al.
patent: 6348862 (2002-02-01), McDonnell et al.
patent: 6377009 (2002-04-01), Philipp
patent: 6429782 (2002-08-01), Pavatich et al.
patent: 6455839 (2002-09-01), O'Connor et al.
patent: 6499359 (2002-12-01), Washeleski et al.
http://www.hunting.co.uk/info/ddctheory.htm: Digital Down Conversion (DDC) Theory, pp1-6, Jan. 3, 2002.
U.S. patent application Ser. No. 10/142,641, filed May 20, 2002 and entitled Method and Apparatus for Detecting a Change in Capacitance of a Capacitive Proximity Sensor, attorney docket No. DP-306074.
U.S. patent application Ser. No. 10/142,643, filed May 10, 2002 and entitled Flexible Capacitive Strip for use in a Non-Contact Obstacle Detection System, attorney docket No. DP-304424.
U.S. patent application Ser. No. 10/143,141, filed May 10, 2002 and entitled Non-Contact Obstacle Detecion System Utilizing Ultra Sensitive Capacitive Sensing, attorney docket No. DP-304425.
International Search Report for PCT/US02/32584, Dec. 9, 2002, 1 page.
Deplae Brian
Haag Ronald Helmut
Husic Jeremy M.
Pasiecznik, Jr. John
Delphi Technologies Inc.
Le N.
McBain Scott A.
Teresinski John
LandOfFree
Capacitive sensor assembly for use in a non-contact obstacle... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Capacitive sensor assembly for use in a non-contact obstacle..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitive sensor assembly for use in a non-contact obstacle... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3189288