Strain gage having an attached unstrained area for the mounting of signal conditioning components

• US 6,431,013 B2
• Filed: 03/20/2001
• Issued: 08/13/2002
• Est. Priority Date: 08/16/1999
• Status: Expired due to Term

• Current Assignee: CTS Corporation
• Original Assignee: CTS Corporation
• Inventors: Nonnenmacher, Ronald C., Newcomer, James M., Blakesley, Patrick B.
• Primary Examiner(s): NOORI, MAX H
• Application Number:
  US09/813,336
• Publication Number:
  US 20010011481A1
• Time in Patent Office: 511 Days
• Field of Search: 737/88, 737/94, 738/18, 738/20, 738/55, 738/56, 738/620.44, 738/620.46, 738/626.29, 738/626.32, 738/626.37
• US Class Current: 73/862.632
• CPC Class Codes: B60N 2/002 Seats provided with an occupancy detection means mounted therein or thereon detection means responsive to presence or absence of children B60N2/266
• CPC Class Codes: B60N 2/7094 Upholstery springs
• CPC Class Codes: G01G 19/4142 for controlling activation of safety devices, e.g. airbag systems electrical circuits for triggering safety arrangements in case of vehicle accidents B60R21/015
• CPC Class Codes: G01G 3/1402 Special supports with preselected places to mount the resistance strain gauges; Mounting of supports

Abstract

A weight sensor for measuring a weight applied to the sensor. The sensor includes a substrate that has a center section that is adapted to flex in response to the applied weight and a step section that is attached to the center section. The step section concentrates the weight onto to the center section. Strain gage resistors are mounted on the center section of the substrate for generating an electrical signal in response to the substrate being flexed. A wing section is attached to the center section. The wing section is out of the weight path and does not flex. The wing section contains signal conditioning electronics operative to condition the electrical signal.

Claims

1. A weight sensor for measuring a weight applied to the sensor, comprising:

a) a substrate including;

1) a center section that is adapted to flex in response to the applied weight;

2) at least one step section attached to the center section, the center section located adjacent the step section, the step section adapted to concentrate the weight applied thereon onto to the center section; and

3) at least one outer section attached to the step section;

b) at least one strain gage resistor, mounted on the center section of the substrate, for generating an electrical signal in response to the substrate being stressed; and

c) at least one wing section attached to the center section, the wing section adapted to be out of the path of the weight and not to flex, the wing section containing signal conditioning electronics operative to condition the electrical signal.

2. The weight sensor according to claim 1, wherein at least one circuit line electrically connects the strain gage resistor to the signal conditioning electronics.

3. The weight sensor according to claim 1, wherein the wing section is connected to the center section by a bridge.

4. The weight sensor according to claim 1, wherein a wiring harness is electrically connected to the signal conditioning electronics.

5. The weight sensor according to claim 1, wherein the signal conditioning electronics converts the electrical signal to a digital electrical signal.

6. The weight sensor according to claim 5, wherein the signal conditioning electronics includes at least one amplifier and an analog to digital converter.

7. The weight sensor according to claim 5, wherein the outer section has an aperture passing therethrough.

8. A weight sensor for measuring a weight applied to the sensor, comprising:

a) a gull wing shaped substrate having a center section that is adapted to flex in response to the applied weight and a pair of outer sections attached to the center section;

b) at least one strain gage resistor, mounted on the center section of the substrate, for generating an electrical signal in response to the substrate being stressed; and

c) at least one wing section attached to the center section, the wing section adapted to be out of the path of the weight and not to flex, the wing section containing signal conditioning electronics operative to condition the electrical signal.

9. The weight sensor according to claim 8, wherein a step section is attached between the center section and the outer sections, the step sections adapted to concentrate the weight applied thereon onto to the center section.

10. The weight sensor according to claim 9, wherein at least one circuit line electrically connects the strain gage resistor to the signal conditioning electronics.

11. The weight sensor according to claim 8, wherein the wing section is connected to the center section by a bridge.

12. The weight sensor according to claim 8, wherein a wiring harness is electrically connected to the signal conditioning electronics.

13. The weight sensor according to claim 8, wherein the signal conditioning electronics converts the electrical signal to a digital electrical signal.

14. The weight sensor according to claim 8, wherein the signal conditioning electronics includes at least one amplifier and an analog to digital converter.

15. The weight sensor according to claim 8, wherein the outer section has an aperture passing therethrough.