Capacitive sensor assembly for use in a non-contact obstacle detection system

• US 6,700,393 B2
• Filed: 05/10/2002
• Issued: 03/02/2004
• Est. Priority Date: 10/17/2001
• Status: Expired due to Fees

• Current Assignee: Strattec Power Access LLC (Strattec Security Corporation)
• Original Assignee: Delphi Technologies, Inc. (Aptiv PLC)
• Inventors: Pasiecznik, John Jr., Haag, Ronald Helmut, Husic, Jeremy M., Deplae, Brian
• Primary Examiner(s): Le, N.
• Assistant Examiner(s): Teresinski, John
• Application Number:
  US10/142,680
• Publication Number:
  US 20030071640A1
• Time in Patent Office: 662 Days
• Field of Search: 324/674, 324/658, 324/660, 324/661, 324/686
• US Class Current: 324/674
• CPC Class Codes: E05F 15/46 responsive to changes in electrical capacitance
• CPC Class Codes: E05Y 2600/40 Mounting location; Visibility of the elements
• CPC Class Codes: H03K 2017/9602 characterised by the type or shape of the sensing electrodes
• CPC Class Codes: H03K 2217/96078 Sensor being a wire or a strip, e.g. used in automobile door handles or bumpers

Abstract

A capacitive sensor assembly is disclosed. 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.

Claims

1. A capacitive sensor assembly comprising:

a capacitive strip having an elongated body for flexible mounting to a panel along a bottom surface of said elongated body;

a first elongated planar conductor contained within an upper section of said elongated body;

a longitudinal cavity formed through a central portion of said elongated body, said longitudinal cavity being disposed between said planar conductor and said bottom surface; and

a capacitance detector module inserted within said longitudinal cavity, said capacitance detector module including a capacitance detector circuit therein;

wherein said capacitance detector circuit is coupled to said first elongated planar conductor, wherein said first elongated planar conductor comprises a first electrode of a sensing capacitor coupled to said capacitance detector circuit, and said longitudinal cavity comprises a portion of a dielectric material of said sensing capacitor, wherein said elongated body is formed by extrusion of an insulating material and, wherein said insulating material further comprises santoprene rubber.

2. The capacitive sensor assembly of claim 1, wherein a dielectric constant of said capacitive strip is determined by both said longitudinal cavity and said santoprene rubber.

3. The capacitive sensor assembly of claim 1, wherein the capacitive sensor assembly is configured for use in a non-contact obstacle detection system of a vehicle.

4. A capacitive sensor assembly comprising:

a capacitive strip having an elongated body for flexible mounting to a panel along a bottom surface of said elongated body;

a first elongated planar conductor contained within an upper section of said elongated body;

a longitudinal cavity formed through a central portion of said elongated body, said longitudinal cavity being disposed between said planar conductor and said bottom surface; and

a capacitance detector module inserted within said longitudinal cavity, said capacitance detector module including a capacitance detector circuit therein;

wherein said capacitance detector circuit is coupled to said first elongated planar conductor and said first elongated planar conductor comprises a first electrode of a sensing capacitor coupled to said capacitance detector circuit, and said longitudinal cavity comprises a portion of a dielectric material of said sensing capacitor, wherein said elongated body includes a pair of grooves therein, said grooves thereby allowing said elongated body to be slid into and mounted within a carrier.

5. The capacitive sensor assembly of claim 4, further comprising an adhesive strip affixed to said bottom surface of said elongated body.

6. The capacitive sensor assembly of claim 4, wherein the capacitive sensor assembly is configured for use in a non-contact obstacle detection system of a vehicle.

7. A capacitive sensor assembly comprising:

a capacitive strip having an elongated body for flexible mounting to a panel along a bottom surface of said elongated body;

a first elongated planar conductor contained within an upper section of said elongated body;

a longitudinal cavity formed through a central portion of said elongated body, said longitudinal cavity being disposed between said planar conductor and said bottom surface; and

a capacitance detector module inserted within said longitudinal cavity, said capacitance detector module including a capacitance detector circuit therein, said first elongated planar conductor comprises a first electrode of a sensing capacitor coupled to said capacitance detector circuit, and said longitudinal cavity comprises a portion of a dielectric material of said sensing capacitor, said capacitance detector circuit being coupled to said first elongated planar conductor, wherein said elongated body is formed by extrusion of an insulating material and said insulating material surrounds said first elongated planar conductor.

8. The capacitive sensor assembly of claim 7, wherein said panel comprises a second electrode of said sensing capacitor.

9. The capacitive sensor assembly of claim 8, wherein said planar conductor comprises a flexible material such that a substantially constant distance is maintained between said first elongated planar conductor and said panel.

10. The capacitive sensor assembly of claim 7, wherein said first elongated planar conductor further comprises braided wire.

11. The capacitive sensor assembly of claim 10, wherein said braided wire is formed from tinned copper material.

12. The capacitive sensor assembly of claim 7, further comprising an adhesive strip affixed to said bottom surface of said elongated body.

13. The capacitive sensor assembly of claim 7, wherein the capacitive sensor assembly is configured for use in a non-contact obstacle detection system of a vehicle.

14. A capacitive sensor assembly comprising:

a capacitive strip having an elongated body for flexible mounting to a panel along a bottom surface of said elongated body;

a first elongated planar conductor contained within an upper section of said elongated body;

a longitudinal cavity formed through a central portion of said elongated body, said longitudinal cavity being disposed between said planar conductor and said bottom surface; and

a capacitance detector module inserted within said longitudinal cavity, said capacitance detector module including a capacitance detector circuit therein;

wherein said capacitance detector circuit is coupled to said first elongated planar conductor and said capacitance detector module comprises;

a printed circuit board;

a shielding structure for shielding radiated emissions generated by devices contained within said printed circuit board; and

a connection mechanism for electrically connecting said printed circuit board with said first elongated planar conductor.

15. The capacitive sensor assembly of claim 14, wherein said connection mechanism further comprises:

a terminal clip having a first end attached to a back side of said printed circuit board; and

a second end of said terminal clip is attached to said first elongated planar conductor.

16. The capacitive sensor assembly of claim 15, wherein said second end of said terminal clip is generally horseshoe shaped.

17. The capacitive sensor assembly of claim 14, wherein said shielding structure further comprises:

a first shield for shielding a first oscillator included within said printed circuit board; and

a second shield for shielding a second oscillator included within said printed circuit board.

18. The capacitive sensor assembly of claim 14, further comprising:

a rubber boot, said rubber boot being formed over a first end of said capacitance detector module prior to insertion of said capacitance detector module into said longitudinal cavity of said elongated body.

19. The capacitive sensor assembly of claim 14, wherein said capacitance detector module further comprises:

a coaxial cable and connector, connected to said printed circuit board, said coaxial cable capable of delivering power to said capacitance detector module, and transmitting signals generated within said capacitance detector module.

20. The capacitive sensor assembly of claim 14, further comprising an adhesive strip affixed to said bottom surface of said elongated body.

21. The capacitive sensor assembly of claim 14, wherein the capacitive sensor assembly is configured for use in a non-contact obstacle detection system of a vehicle.